Foundry sand water washing and de-sliming device and method

Abstract

The application provides a foundry sand water washing and mud controlling device and method, and belongs to the technical field of sand washing. The foundry sand water washing and mud controlling device comprises a water washing barrel body, a water inlet module, a feeding module and a washing and controlling module. The water washing barrel body comprises a main barrel body and an overflow tank, and the outer periphery of the main barrel body is provided with the overflow tank. The water inlet module comprises a uniform flow plate and a water inlet pipe, and the uniform flow plate longitudinally divides the main barrel body into a water inlet cavity and a water washing cavity. The washing and controlling module is arranged at the middle part of the main barrel body, and comprises at least two flexible kneading belts arranged at intervals. Adjacent two flexible kneading belts form a flow space, and the two flexible kneading belts are relatively moved to knead the sand particles in the flow space. The foundry sand water washing and mud controlling device avoids the problem of uneven cleaning caused by local accumulation, improves the cleaning efficiency, and flexibly contacts and kneads the sand particles, avoids the impact and damage of traditional rigid structures on the sand particles, and reduces the sand loss rate.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sand washing, and more particularly relates to a foundry sand water washing and mud control device and method. BACKGROUND

[0002] In the foundry industry, the cleanliness of foundry sand directly determines the surface quality and dimensional accuracy of castings. The surface of the foundry sand usually adheres to mud, which can cause defects such as sand sticking, slag inclusion, and porosity in the castings, so the mud content of the foundry sand needs to be strictly controlled below 0.1% through a water washing and mud control process.

[0003] Currently, there are mainly two types of foundry sand water washing and mud control equipment. One is a multi-stage power washing type device, which uses blades or the like to agitate the sand-water mixture, relies on the collision and friction between the sand particles to strip the mud, and then separates the mud and sand through screening. The other is a static sedimentation type mud washing device, which injects foundry sand and water into a sedimentation tank by artificial or water pump, and relies on gravity to realize sand particle sedimentation and mud-containing clean water overflow separation.

[0004] However, the blades used in the first type of device are rigid, which can easily cause sand particle abrasion when colliding with the foundry sand, affecting the performance of the sand. The second type of device has very poor treatment capacity for stubborn mud films and cannot effectively strip the clay cement layer on the surface of the foundry sand, resulting in poor sand washing effect. SUMMARY

[0005] The purpose of the present application is to provide a foundry sand water washing and mud control device and method, which aims to avoid the problem of sand particle abrasion while ensuring the mud control effect.

[0006] To achieve the above purpose, the technical solution adopted by the present application is to provide a foundry sand water washing and mud control device, which comprises:

[0007] A water washing barrel body comprising a main barrel body and an overflow tank, the bottom of the main barrel body is provided with a sand discharge port, the outer periphery of the main barrel body is provided with an overflow tank, and the bottom of the overflow tank is provided with a water outlet;

[0008] A water inlet module comprising a flow uniformizing plate and a water inlet pipe, the flow uniformizing plate is arranged at the lower part of the main barrel body, longitudinally dividing the main barrel body into a water inlet cavity and a water washing cavity, and a plurality of flow holes are uniformly arranged on the flow uniformizing plate; the water inlet pipe is arranged at the bottom of the main barrel body and communicates with the water inlet cavity;

[0009] A feeding module comprising a feeding pipe and a guide plate, the feeding pipe is longitudinally arranged at the upper part of the main barrel body, and the upper end of the feeding pipe is provided with a feeding port; a plurality of guide plates are arranged at the lower part of the feeding pipe, dividing the lower part of the feeding pipe into a plurality of discharging spaces, and each discharging space is provided with a discharging port at the bottom;

[0010] The washing control module is arranged in the middle of the main barrel body, and comprises at least two flexible kneading belts arranged at intervals. Adjacent two flexible kneading belts form a flow space, and two flexible kneading belts are relatively moved to knead sand particles in the flow space.

[0011] As another embodiment of the present application, a plurality of discharge ports are arranged in a radial ring on the outer periphery of the feeding pipe.

[0012] As another embodiment of the present application, the guide plate comprises:

[0013] A plurality of inner guide plates are arranged in the inner cavity of the feeding pipe, and the plurality of inner guide plates are arranged at intervals in the horizontal direction. The inner guide plates are arranged at an angle, and the bottom of the inner guide plate is connected to a material passing port.

[0014] A plurality of spiral shunt guide plates are arranged in a ring on the outer periphery of the feeding pipe, and a spiral discharge channel is formed by the outer side wall of the feeding pipe. The upper end of the spiral discharge channel is connected to the material passing port, and the discharge port is arranged at the lower end of the spiral discharge channel.

[0015] As another embodiment of the present application, a plurality of material passing ports are arranged at intervals in the longitudinal direction, and the discharge ports are arranged at equal intervals along the outer periphery of the feeding pipe. The discharge direction of the discharge port is tangential to the feeding pipe.

[0016] As another embodiment of the present application, the flow hole is arranged at an angle in the longitudinal direction.

[0017] As another embodiment of the present application, the washing control module comprises:

[0018] The fixed frame body comprises a fixed seat and an elastic frame. The fixed seat is arranged on the inner side wall of the main barrel body, and the elastic frame is connected to the fixed seat. The elastic frame has a degree of freedom in the longitudinal direction.

[0019] The moving frame body comprises a rotating drive shaft and a rotating frame. The rotating drive shaft is arranged longitudinally in the main barrel body, and the lower end of the rotating drive shaft extends below the discharge port. The rotating frame is connected to the rotating drive shaft and rotates horizontally with the rotating drive shaft.

[0020] Two flexible kneading belts are respectively connected to the fixed frame body and the rotating frame.

[0021] As another embodiment of the present application, the flexible kneading belt is annular, and the height of the flexible kneading belt gradually decreases from the edge to the center. The flexible kneading belt comprises:

[0022] The flexible sleeve body is an annular sleeve body, and the working surface of the flexible sleeve body is uniformly distributed with convex structures.

[0023] A plurality of support skeletons are evenly distributed inside the flexible sleeve body, and the support skeletons are connected to the fixed frame body or the movable frame body.

[0024] The casting sand water washing and mud control device has the advantages that compared with the prior art, the casting sand water washing and mud control device of the present application forcibly disperses sand particles through the structure of the guide plate of the feeding module, combines with the uniform water flow brought by the flow uniformizing plate, avoids the problem of uneven cleaning caused by local accumulation, and actively peels off stubborn mud stains through the relative movement of the kneading belts, cooperates with the stable water flow provided by the flow uniformizing plate to timely remove impurities, compared with simple water flow washing, the cleaning efficiency is improved, and the flexible contact kneading of the sand particles avoids the impact and damage of the sand particles by the traditional rigid structure, and reduces the sand loss rate.

[0025] The present application also provides a casting sand water washing and mud control method, which adopts the casting sand water washing and mud control device described above, and comprises the following steps.

[0026] S1, water is injected into the main barrel through the water inlet pipe until it starts to overflow;

[0027] S2, casting sand is poured into the feeding pipe through the feeding port, and the casting sand is divided into multiple portions by the guide plate and discharged to the main barrel through the discharge ports of different discharge spaces;

[0028] S3, the sand particles enter the flow space between the two flexible kneading belts and are kneaded by the relatively moving flexible kneading belts;

[0029] In steps S2 to S3, the water inlet pipe continuously injects water, and the mud water overflows from the upper end of the main barrel into the overflow tank and is discharged through the water outlet of the overflow tank.

[0030] As another embodiment of the present application, in step S3, the flexible kneading belts move periodically and reciprocally.

[0031] The casting sand water washing and mud control method provided by the present application has all the advantages of the casting sand water washing and mud control device described above, and increases the uniformity of the sand entering the water washing cavity. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0033] Figure 1The structural schematic view of the casting sand water washing and mud controlling device provided by the embodiment of the present application is shown in the figure.

[0034] Figure 2 The side view of the casting sand water washing and mud controlling device provided by the embodiment of the present application is shown in the figure.

[0035] Figure 3 The sectional view of the casting sand water washing and mud controlling device provided by the embodiment of the present application is shown in the figure.

[0036] Figure 4 The Figure 3 The enlarged view of A in the figure.

[0037] Figure 5 The Figure 3 The enlarged view of B in the figure.

[0038] Figure 6 The top view of the fixed kneading belt provided by the embodiment of the present application is shown in the figure.

[0039] In the figure: 1, main barrel body; 2, overflow launder; 3, feeding pipe; 4, water outlet; 5, water inlet pipe; 6, support; 7, sand discharge port; 8, motor; 9, shaft sleeve; 10, flow uniformizing plate; 11, fixed kneading belt; 12, movable kneading belt; 13, pipe inner guide plate; 14, spiral shunt guide plate; 15, rotary drive shaft; 16, protruding structure; 17, sealing ring; 18, rotating frame; 19, discharging gap.

[0040] 111, fixing seat; 112, pressing plate; 113, crimping frame; 114, spring; 115, shielding ring; 116, columnar protrusion; 117, flexible sealing gasket; 118, flexible sleeve body; 119, support framework. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application is further described in detail below in combination with the figures and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0042] Please refer to Figures 1 to 6The casting sand water washing and mud controlling device and method are described as follows. The casting sand water washing and mud controlling device comprises a water washing barrel body, a water inlet module, a feeding module and a washing and controlling module. The water washing barrel body comprises a main barrel body 1 and an overflow tank 2. The bottom of the main barrel body 1 is provided with a sand discharge port 7. The outer periphery of the main barrel body 1 is provided with the overflow tank 2. The bottom of the overflow tank 2 is provided with a water outlet 4. The water inlet module comprises a flow uniformizing plate 10 and a water inlet pipe 5. The flow uniformizing plate 10 is arranged at the lower part of the main barrel body 1 and longitudinally divides the main barrel body 1 into a water inlet cavity and a water washing cavity. A plurality of flow holes are uniformly arranged on the flow uniformizing plate 10. The water inlet pipe 5 is arranged at the bottom of the main barrel body 1 and communicates with the water inlet cavity. The feeding module comprises a feeding pipe 3 and a guide plate. The feeding pipe 3 is longitudinally arranged at the upper part of the main barrel body 1. The upper end of the feeding pipe 3 is provided with a feeding port. A plurality of guide plates are arranged at the lower part of the feeding pipe 3 and divide the lower part of the feeding pipe 3 into a plurality of discharging spaces. The bottom of each discharging space is provided with a discharging port. The washing and controlling module is arranged at the middle part of the main barrel body 1. The washing and controlling module comprises at least two flexible kneading belts arranged at intervals. The adjacent two flexible kneading belts form a flow space. The two flexible kneading belts are relatively moved to knead the sand particles in the flow space.

[0043] The water in the casting sand water washing and mud controlling device is injected into the water inlet cavity at the bottom of the main barrel body 1 through the water inlet pipe 5. After the water inlet cavity is filled, the water flow is blocked by the flow uniformizing plate 10 and penetrates upward through the flow holes uniformly distributed on the flow uniformizing plate 10 to form a stable and balanced upward water flow into the water washing cavity. After the water washing cavity is filled, the water flow overflows along the upper end edge of the main barrel body 1 into the overflow tank 2 and is finally discharged from the water outlet 4.

[0044] In the prior art, the casting sand (referred to as sand material) directly falls into water through the feeding pipe. The sand material is accumulated together when entering the water and cannot be uniformly dispersed, which affects the water washing effect. In the present application, a guide plate is arranged in the feeding pipe. The lower space of the feeding pipe is divided into a plurality of discharging spaces, which are discharged respectively. The sand material is poured into the feeding pipe 3 from the upper end feeding port. When falling to the lower part, the sand material is divided by the plurality of discharging spaces divided by the guide plate. Finally, the sand material is uniformly and dispersedly discharged into the water washing cavity through the discharging ports at the bottom of the spaces, so that the sand particles are prevented from being accumulated together.

[0045] Different from the sedimentation and stratification in the prior art, the flexible kneading belts are arranged in the present application. The mud wrapped on the sand particles is removed by the kneading mode. Specifically, the dispersed sand particles move downward under the action of gravity and enter the flow space formed by the adjacent flexible kneading belts when passing through the washing and controlling module. Since the belt body moves relatively, the sand particles are gently kneaded by the flexible material. The mud and impurities attached to the surface of the sand particles are forced to be stripped. At the same time, the upward water flow timely washes away the stripped impurities.

[0046] The clean sand particles continue to sink due to the large density, and finally are discharged through the conventional sand discharge port 7 at the bottom of the main barrel body 1; the sewage containing impurities is overflowed upward under the water flow and enters the outer peripheral overflow tank 2, and is discharged through the water outlet 4 at the bottom, so that the whole treatment process is completed.

[0047] Compared with the prior art, the feeding module of the casting sand water washing mud control device forces the sand particles to disperse, and the uniform flow brought by the flow uniforming plate 10 avoids the problem of uneven cleaning caused by local accumulation; in addition, the relative movement of the rubbing belt initiatively peels off stubborn stains, and the stable water flow provided by the flow uniforming plate 10 timely carries away impurities, compared with pure water flow washing, the cleaning efficiency is improved, and the flexible contact rubs the sand particles, avoiding the impact and damage of traditional rigid structure to the sand particles, and reducing the sand loss rate.

[0048] The sand discharge port 7 is arranged in the middle of the flow uniforming plate 10 and is connected with a sand discharge pipe penetrating through the bottom of the main barrel body 1.

[0049] Optionally, the water inlet direction of the water inlet pipe 5 is along the tangential direction of the main barrel body 1, and the clean water enters the water inlet cavity in the main barrel body 1 through the water inlet pipe 5, forming a spiral water flow state. When the spiral water flow penetrates upward, it is uniformly distributed through the overflow hole of the flow uniforming plate 10 and still retains the rotating characteristic to enter the water washing cavity, forming a “spiral upward” composite water flow state, which not only ensures the uniformity of the water flow, but also increases the contact area and relative movement intensity of the water flow and the sand particles. The spiral upward water flow will generate a lateral rotating thrust on the falling sand particles, so that the sand particles rotate and diffuse during the gravity settling process, further breaking the agglomeration state, and realizing the sufficient premixing of the sand particles and the water flow.

[0050] A support 6 is arranged at the upper part of the main barrel body 1, and the feeding pipe 3 is fixed on the support 6.

[0051] In some possible embodiments, the plurality of discharge ports are arranged in a radial ring on the outer periphery of the feeding pipe 3.

[0052] The guide plate is located in the feeding pipe 3 and divides the inner cavity of the feeding pipe 3 into a plurality of discharging spaces with equal cross sections, a plurality of discharge ports are arranged in a radial distribution at the bottom of the feeding pipe 3, the plurality of discharge ports and the plurality of discharging spaces are one-to-one corresponding, and the discharge ports are arranged along the radial direction of the feeding pipe.

[0053] Optionally, the guide plate is a rectangular plate body, which is distributed along the radial direction of the feeding pipe 3 and connected at one end to a fixed rod on the central axis of the feeding pipe 3 and at the other end to the inner side wall of the feeding pipe 3. The guide plate is longitudinally arranged, and the lower end thereof extends to the bottom plate of the feeding pipe 3. The discharge port is arranged on the circumferential side wall of the feeding pipe 3.

[0054] The sand is discharged in a radial manner through a plurality of discharge ports arranged in a radial ring around the outer periphery of the feeding pipe 3. The sand particles fall and spread in all directions under the action of gravity, and are initially contacted with the spiral water flow. The sand particles are further dispersed by the rotational force of the water flow, thereby avoiding local accumulation of the sand particles.

[0055] The dispersed sand particles are uniformly distributed in all areas of the water washing cavity along the spiral water flow, and can uniformly enter the overflow space of the washing control module during the falling process. The relative movement of the flexible kneading belt generates a mechanical kneading force, which cooperates with the rotational shearing force of the spiral water flow to clean the sand particles in all areas without dead angles, and the peeled impurities are quickly carried away by the water flow.

[0056] The dispersed sand particles can more uniformly pass through the overflow space of the washing control module, and the contact probability with the flexible kneading belt is improved, and the interaction with the spiral water flow is more sufficient.

[0057] In some possible embodiments, referring to Figure 3 , the guide plate includes a plurality of in-pipe guide plates 13 and a plurality of spiral distribution guide plates 14. The plurality of in-pipe guide plates 13 are arranged in the inner cavity of the feeding pipe 3, and the in-pipe guide plates 13 are arranged in a horizontal direction and are arranged in a tilted manner. The bottom of the in-pipe guide plate 13 is connected to the overflow port. The plurality of spiral distribution guide plates 14 are arranged in a ring around the outer periphery of the feeding pipe 3, and a spiral discharge channel is formed around the outer side wall of the feeding pipe 3. The upper end of the spiral discharge channel is connected to the discharge port, and the discharge port is arranged at the lower end of the spiral discharge channel.

[0058] Specifically, the in-pipe guide plate 13 is a straight plate or an arc-shaped plate, and the in-pipe guide plate 13 is arranged in a tilted manner. The bottom of the in-pipe guide plate 13 is connected to the spiral distribution guide plate 14. The spiral distribution guide plate 14 is an arc-shaped plate, which is spirally attached to the outer side of the feeding pipe 3. The lower end of the spiral distribution guide plate 14 forms a discharge port, and the discharge port forms a discharge direction along the tangential direction of the feeding pipe 3 and downwardly inclined by means of the spiral distribution guide plate 14.

[0059] The spiral distribution guide plate 14 can control the direction of the discharge port by changing the length, so that the plurality of discharge ports are uniformly distributed around the outer periphery of the feeding pipe 3. The uniformity of the feeding distribution is improved, and the sand particles entering the water washing cavity have a horizontal distribution speed, which prolongs the contact time between the sand particles and the water flow, increases the contact area, and improves the pre-cleaning effect and the initial impurity peeling efficiency.

[0060] The parameters of the spiral channel and the inclination angle of the in-pipe guide plate 13 can be adjusted to adapt to the processing requirements of the foundry sand with different particle sizes and different humidity, thereby avoiding the agglomeration and blockage of the sand.

[0061] In some possible embodiments, the plurality of overflow ports are arranged in a longitudinal direction, and the discharge ports are arranged at equal intervals around the outer periphery of the feeding pipe 3. The discharge direction of the discharge port is tangential to the feeding pipe 3.

[0062] The plurality of in-pipe guide plates 13 can be arranged in parallel, and the bottom of the in-pipe guide plate 13 is provided with a flow port at the connection with the inner wall of the feed pipe 3, and a plurality of flow ports are arranged longitudinally at intervals. By adjusting the length of the spiral shunt guide plate 14, any two adjacent discharge ports can be distributed equidistantly in the horizontal direction.

[0063] Optionally, the in-pipe guide plate 13 has three, and the three in-pipe guide plates 13 are arranged at intervals and in parallel, forming a discharging space above the three in-pipe guide plates 13. After the sand enters the feed pipe 3, it falls to the upper end of the in-pipe guide plate 13 and is separated by the three in-pipe guide plates 13, forming three parts. The three parts of sand fall along the parallel three discharging spaces until they enter the three spiral channels from their corresponding flow ports.

[0064] After the sand is poured into the feed pipe 3 from the inlet, it is received layer by layer by the horizontally spaced inclined in-pipe guide plate 13 and slides along the plate surface to the longitudinally spaced flow ports at the bottom, achieving layered distribution of sand particles in the longitudinal height and avoiding local congestion caused by concentrated falling. Since the discharge direction is tangent to the feed pipe 3, the sand is ejected in the tangent direction of the feed pipe 3 to the surrounding of the water washing cavity, forming a rotating diffusion in the same direction as the spiral water flow in the water washing cavity. The sand particles discharged tangentially are uniformly distributed and rotated and diffused along the radial direction of the water washing cavity under the action of their own kinetic energy and the spiral water flow, and are fully mixed with the spiral upward water flow.

[0065] In some possible embodiments, the flow holes are arranged longitudinally inclined.

[0066] The flow plate 10 is a rigid plate body with a certain thickness, and the flow holes penetrate the flow plate 10 in the thickness direction of the flow plate 10, forming channels that allow water flow. When the length direction of the flow hole is arranged at an angle with the thickness direction of the flow plate 10, the water flow entering the water washing cavity is in an inclined flow state. Optionally, the inclined direction of the flow hole is consistent with the rotation direction of the water flow in the water inlet cavity.

[0067] The flow holes on the flow plate 10 are arranged longitudinally inclined, so that the spiral water flow has smaller resistance when passing through the flow holes, and the characteristics of spiral rotation are retained and strengthened. Under the push of the spiral water flow strengthened by the inclined flow holes, the sand particles are uniformly distributed in the water washing cavity and fully contact the washing control module.

[0068] Clean sand particles accelerate to the barrel wall under the combined action of the centrifugal force of the strengthened spiral water flow and gravity, and enter the flow space of the flexible kneading belt from the outer edge. The sewage containing impurities gradually converges to the center and flows upward until it overflows into the overflow tank 2 at the outer periphery.

[0069] In some possible embodiments, please refer to Figures 3 to 5The washing and controlling module comprises a fixed frame body and a movable frame body. The fixed frame body comprises a fixed seat 111 and an elastic frame. The fixed seat 111 is arranged on the inner side wall of the main barrel body 1. The elastic frame is connected to the fixed seat 111. The elastic frame has a longitudinal degree of freedom. The movable frame body comprises a rotating drive shaft 15 and a rotating frame 18. The rotating drive shaft 15 is longitudinally arranged in the main barrel body 1. The lower end of the rotating drive shaft 15 extends below the discharge port. The rotating frame 18 is connected to the rotating drive shaft 15 and rotates horizontally with the rotating drive shaft 15. Two flexible kneading belts are respectively connected to the fixed frame body and the rotating frame 18.

[0070] The two flexible kneading belts comprise a fixed kneading belt 11 and a movable kneading belt 12. In the working process, the fixed kneading belt 11 remains stationary. The movable kneading belt 12 rotates by external force, so that the two flexible kneading belts move relative to each other.

[0071] Optionally, the flexible kneading belts can be arranged horizontally to form a funnel-shaped structure. The fixed kneading belt 11 is located below, and the movable kneading belt 12 is located above. An inclined flow passage is formed between the two.

[0072] In the falling process of the sand, the sand needs to pass through the flow passage from top to bottom. At the same time, in the overflow process of the water flow, the water flow needs to pass through the flow passage from bottom to top. The two converge in the flow passage. In the moving process of the movable kneading belt 12, the sand is kneaded and rolled. The mud layer wrapped outside is loosened and then carried away by the upward flowing water. The sand continues to move downward, spirally passes through the flow passage, and falls below the flexible kneading belt. After being washed by water, the sand is deposited at the bottom of the main barrel body 1 or the bottom of the uniform flow plate 10.

[0073] The fixed kneading belt 11 is mounted on the inner side wall of the main barrel body 1 by means of the fixed frame body. Specifically, as shown in Figures 3 to 5 , the fixed seat 111 can be mounted on the inner side wall of the main barrel body 1 by welding or the like. The fixed seat 111 can be a plurality of spaced block structures or a ring-shaped integral structure.

[0074] The elastic frame comprises a support ring and a plurality of elastic seats. The elastic seats are a plurality of separate block structures or a ring-shaped integral structure. The elastic seats are connected to the fixed seat 111 in correspondence.

[0075] When the fixed seat 111 is a block structure, an installation slot with an upward opening is formed. The outer arc surface of the fixed seat 111 is used to fit the inner side wall of the main barrel body 1. The inner arc surface of the fixed seat 111 faces the center direction of the main barrel body 1. A plurality of installation holes are arranged on the lower part of the inner arc surface of the fixed seat 111. The installation holes are used to connect the elastic frame.

[0076] The elastic seat comprises a spring 114, a pressing plate 112 and a crimping frame 113. The pressing plate 112 is an L-shaped plate structure, which comprises a horizontal plate and a vertical plate. The horizontal plate is used to fit on the upper end surface of the fixed seat 111, and the vertical plate is used to fit on the inner arc surface of the fixed seat 111. A bolt counterbore is arranged at the bottom of the vertical plate, which corresponds to the mounting hole one by one. The pressing plate 112 can be fixed and mounted on the fixed seat 111 by bolts, and the lower end surface of the horizontal plate of the pressing plate 112 is fitted with the upper end surface of the fixed seat 111 when the mounting is completed. A through hole is formed in the horizontal plate, which is located above the mounting groove when the mounting is completed.

[0077] The lower end of the crimping frame 113 has a downwardly extending cylindrical protrusion 116, the lower end of which penetrates downwardly through the through hole and extends below the horizontal plate. The part of the lower end of the cylindrical protrusion 116 protruding is provided with a shielding ring 115, and the outer diameter of the shielding ring 115 is larger than that of the through hole to prevent the cylindrical protrusion 116 from coming out.

[0078] During installation, the spring 114 is sleeved outside the end of the cylindrical protrusion 116, and one end of the spring 114 abuts against the groove bottom of the mounting groove, and the other end abuts against the shielding ring 115. When the pressing plate 112 is mounted on the fixed seat 111, the spring 114 is limited in the mounting groove, and the crimping frame 113 can move longitudinally by means of the spring 114.

[0079] A flexible sealing gasket 117 is arranged at the upper end of the crimping frame 113, which is fitted on the outside wall of the main barrel body 1 outside after the installation is completed, so as to avoid the sand entering between the crimping frame 113 and the inner side wall of the main barrel body 1, and avoid blocking the elastic movement of the crimping frame 113. After the installation is completed, the flexible sealing gasket 117 is annularly arranged on both sides and above the fixed seat 111.

[0080] When the sand particles or the bunched sand of different particle sizes enter between the flexible kneading belts, the spring 114 connected with the crimping frame 113 will be subjected to extrusion or release force. When coarse sand, bunched sand and other large-volume sand materials are encountered, the spring 114 is compressed when the sand materials enter the overflow passage, the crimping frame 113 drives the fixed side kneading belt to retreat longitudinally downward, and the kneading distance is automatically increased. When fine sand, scattered sand and other small-volume sand materials are processed, the spring 114 is reset or slightly stretched. The setting of the spring 114 avoids the rigid impact between the kneading belt and the sand particles and the rotating frame 18, and avoids the sudden increase of the load of the rotating drive shaft 15 caused by the sand particle jamming.

[0081] The cooperation of the fixed seat 111 and the elastic frame, when the sand particles enter the flow space between the two kneading belts, if the sand particle size is larger or the flow fluctuates, the crimping frame 113 is extruded downward to compress the spring 114, and the kneading interval is adaptively adjusted by longitudinal movement; after the sand particles pass through, the spring 114 resets to make the crimping frame 113 reset, and the stable kneading pressure is maintained.

[0082] The moving frame is installed on the rotating drive shaft 15, which can penetrate the feeding pipe 3, or the moving frame can be installed on one side of the feeding pipe 3.

[0083] Optionally, a shaft sleeve 9 is installed on the central axis of the feeding pipe 3, the shaft sleeve 9 longitudinally penetrates the feeding pipe 3, and the inner cavity of the feeding pipe 3 forms a ring shape. The rotating drive shaft 15 is located in the shaft sleeve 9. An installation support 6 is arranged above the main barrel body 1, and the motor 8 is installed on the installation support 6. The upper end of the shaft sleeve 9 is fixed on the installation support 6. The upper end of the rotating drive shaft 15 is connected to the output end of the motor 8, and the lower end of the rotating drive shaft 15 extends into the lower part of the feeding pipe 3.

[0084] A sealing ring 17 is arranged at the connection between the bottom plate of the feeding pipe 3 and the shaft sleeve 9. The sealing ring 17 is sleeved on the outside of the rotating drive shaft 15, and is used to seal the lower end port of the shaft sleeve 9.

[0085] A rotating frame 18 is installed at the lower end of the rotating drive shaft 15, the rotating frame 18 extends outward, and the movable kneading belt 12 is installed on the outside of the rotating frame 18.

[0086] In some possible embodiments, please refer to Figure 3 and Figure 6 , the flexible kneading belt is annular, and the height of the flexible kneading belt gradually decreases from the edge to the center; the flexible kneading belt includes a flexible sleeve body 118 and a plurality of support skeletons 119; the flexible sleeve body 118 is an annular sleeve body, and the working surface of the flexible sleeve body 118 is uniformly distributed with protruding structures 16; the plurality of support skeletons 119 are uniformly distributed in the inside of the flexible sleeve body 118, and the support skeletons 119 are connected with the fixed frame body or the moving frame body.

[0087] The fixed kneading belt 11 and the movable kneading belt 12 have consistent structures, and both include the flexible sleeve body 118 and the support skeleton 119.

[0088] The flexible sleeve body 118 can be made of rubber or nylon material. The support skeleton 119 is a rigid member, which is uniformly distributed in the flexible sleeve body 118 along the radial direction to support the flexible sleeve body 118, and is connected with the crimping frame 113 or the rotating frame 18. The working surface of the flexible sleeve body 118 is the surface of the two kneading belts facing each other, and the protruding structure 16 is arranged on the working surface to increase the contact area with the sand.

[0089] The mobile kneading belt is located above the fixed kneading belt 11, and there is a feeding gap between the outer edge of the mobile kneading belt and the inner wall of the main barrel body 1; there is a discharging gap 19 in the center of the fixed kneading belt 11. The overflow channel communicates the feeding gap and the discharging gap 19.

[0090] After entering the water washing cavity, the sand is fed into the overflow channel through the feeding gap by the action of the water flow, and is moved by the relative movement of the mobile kneading belt and the fixed kneading belt 11 in the overflow channel, and is impacted by the reverse flowing water flow, and finally flows out from the discharging gap 19. After flowing out, the sand is concentrated in the central part of the main barrel body 1, and is washed by water again under the impact of the spiral flow of the water flow.

[0091] The cleaned sand particles are guided by the inclined working surface and the centrifugal force of the spiral water flow, and are gathered and settled below the center of the main barrel body 1, and are discharged through the bottom; the impurity-containing sewage flows upward along the edge of the inclined working surface, and is discharged through the overflow tank 2.

[0092] The convex structure 16 is uniformly distributed on the working surface, and the cross section of the convex structure 16 can be semicircular or triangular. Compared with the smooth working surface, the surface distributed with the convex structure 16 increases the pressure on the surface of the sand particles, can effectively crush the sand agglomeration and remove the stubborn soil in the sand, improves the impurity stripping rate, and meets the high requirements of precision casting on the purity of the sand.

[0093] The convex structure 16 forms a "comb tooth effect" when moving relatively, can disperse slightly agglomerated sand; in cooperation with the guiding effect of the inclined working surface, the sand forms a spiral descending motion trajectory in the kneading area, not only can prolong the processing time, but also can ensure that each surface of each sand can contact with the convex structure 16, and improve the uniformity of the sand treatment.

[0094] The thickness of the upper and lower two layers of the flexible kneading belt can be adjusted according to actual needs, for example, the thickness of the fixed kneading belt 11 gradually decreases from the edge to the middle, so that the upper end surface gradually inclines downward along the radial direction from outside to inside, and the lower end surface gradually inclines upward along the radial direction from outside to inside. The thickness of the mobile kneading belt 12 gradually increases from the edge to the middle, so that the upper end surface gradually inclines upward along the radial direction from outside to inside, and the lower end surface gradually inclines downward along the radial direction from outside to inside; the inclined surface can avoid sand accumulation.

[0095] A casting sand water washing and mud control method is also provided, which adopts the casting sand water washing and mud control device described above, and includes the following steps:

[0096] S1, water is injected into the main barrel body 1 through the water inlet pipe 5 until it starts to overflow;

[0097] S2, casting sand is poured into the feeding pipe 3 through the feeding port, and the casting sand is divided into multiple parts by the guide plate and discharged to the main barrel body 1 through the discharging ports of different discharging spaces;

[0098] S3, the sand enters the flow space between the two flexible kneading belts and is kneaded by the relatively moving flexible kneading belts;

[0099] In steps S2 to S3, the water inlet pipe 5 continuously injects water, and the slurry overflows from the upper end of the main barrel body 1 into the overflow groove 2 and is discharged through the water outlet 4 of the overflow groove 2.

[0100] The casting sand water washing and slurry control method provided by the application first continuously injects water into the water inlet cavity at the bottom of the main barrel body 1 through the tangentially arranged water inlet pipe 5 until the clean water overflows from the upper end edge of the main barrel body 1 to the peripheral overflow groove 2, so that a stable water level is formed in the water washing cavity; after the clean water is injected tangentially along the main barrel body 1, a spiral water flow is formed in the water inlet cavity; when the water flow penetrates upward, it is uniformly distributed through the longitudinally inclined flow holes, forming a dynamic environment of "spiral upward" in the water washing cavity.

[0101] Then, the sand is sequentially received by the horizontal interval inclined pipe guide plates 13 in the inner cavity of the feeding pipe 3, slides along the plate surface to the longitudinally interval material passing openings, realizes longitudinal stratified flow distribution, and avoids congestion; the sand enters the spiral material passing guide plate 14 and the spiral material discharging channel around the outer wall of the feeding pipe 3 through the material passing openings, and is further dispersed along the spiral path; finally, the sand is sprayed to the four sides of the water washing cavity from the material discharging openings arranged along the outer periphery of the feeding pipe 3 at equal intervals and tangentially, and the rotating direction is consistent with the spiral water flow, realizing uniform diffusion.

[0102] Then, the sand enters the flow channel between the two flexible kneading belts; when the rotating drive shaft 15 of the moving frame body drives the rotating frame 18 and the movable kneading belt 12 to rotate horizontally, the movable kneading belt 12 and the fixed kneading belt 11 on the side of the fixed frame body form relative motion; the slurry containing impurities flows upward along the edge of the inclined belt body under the continuous water injection.

[0103] The casting sand water washing and slurry control method provided by the application has all the beneficial effects of the casting sand water washing and slurry control device of the prior art, and increases the uniformity of the sand entering the water washing cavity; the elastic material of the flexible kneading belt reduces the collision between sand particles in cooperation with the dispersed feeding, avoids rigid damage, and at the same time ensures the water washing efficiency.

[0104] The present application does not need complex operation and debugging, and can meet the needs of precision casting, ordinary casting and other scenes for sand purity, and the adaptability and practicability of the equipment are greatly improved.

[0105] Optionally, in step S3, the flexible kneading belt moves periodically and reciprocally.

[0106] The upper end of the rotating drive shaft 15 is connected with the motor 8, and the motor 8 can drive the movable rubbing belt 12 to rotate forward and reverse through periodic forward rotation and reverse rotation, so as to realize the forward relative movement and reverse relative movement of the two flexible rubbing belts, and achieve the effect of reciprocating movement. When the sand particles enter the flow space, the reciprocating movement of the movable rubbing belt applies an alternating rubbing force to the sand particles; at the same time, the fixed side pressing frame 113 is longitudinally self-adaptively adjusted in spacing by means of the spring 114, and cooperates with the inclined belt body structure to ensure that sand particles of different particle sizes can be subjected to stable rubbing pressure.

[0107] The reciprocating movement makes the direction of the force of the flexible rubbing belt on the sand particles periodically reverse, which can avoid the problem of slippage of impurities with the belt body in the rotating movement. In the reciprocating movement, the convex structure 16 on the working surface of the flexible rubbing belt moves periodically in the reverse direction, which can shake off the sand particles adhered to the working surface; in cooperation with the vortex effect of the spiral water flow, the impurities in the gap between the convex structures can be completely flushed, which can avoid the problem of accumulation of impurities with the belt body in the process of one-way rotation.

[0108] The outer side of the rotating drive shaft 15 is sleeved with two flexible sleeves (not shown in the figure), the two ends of the first flexible sleeve are respectively attached to the upper end of the rotating frame 18 and the lower end of the feeding pipe 3, and the two ends of the second flexible sleeve are respectively attached to the lower end of the rotating frame 18 and the bottom of the rotating drive shaft; and the two flexible sleeves have a certain amount of excess. The flexible sleeve is fixedly connected or rotatably connected with the rotating frame 18, when it is fixedly connected, the flexible sleeve rotates with the rotating drive shaft 15 to produce forward torsion or reverse torsion; when it is rotatably connected, the flexible sleeve remains stationary. The flexible sleeve can be a bellows, and the flexible sleeve can be made of nylon or rubber.

[0109] Optionally, in step S3, the flexible rubbing belt has a longitudinal degree of freedom, and the longitudinal gap of the flow space periodically changes.

[0110] Optionally, the rotating drive shaft 15 can adopt a screw rod form, and the rotating frame 18 is sleeved on the outer side of the screw rod and threadedly cooperates with the screw rod. The top limit and the bottom limit are arranged on the working end of the screw rod. When the motor 8 rotates forward, the rotating drive shaft 15 drives the rotating frame and the movable rubbing belt to rotate forward and rise upward; when the motor 8 reverses, the rotating drive shaft 15 drives the rotating frame and the movable rubbing belt to rotate reversely and fall downward. The outer periphery of the rotating drive shaft 15 is closed by means of the two flexible sleeves, so as to avoid the contact between the threads of the screw rod and the sand particles and water in the main barrel.

[0111] The lifting and falling movement of the rubbing belt can periodically change the height of the flow space, and cooperate with the centrifugal force of the rotating movement, so that the slightly agglomerated sand particles can be effectively dispersed, and local jamming can be avoided; the spiral brushing effect generated by the convex structure 16 in the combined action of rotation and lifting can thoroughly clean the residual impurities in the gap, and the impurities are not easy to adhere with the help of the spiral water flow; even if a small amount of jamming occurs, the reverse rotation and downward movement can generate a reverse thrust to achieve self-unblocking.

[0112] The above merely describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A casting sand water washing and desliming device, characterized in that, The utility model relates to a sand washing device, including: A water washing barrel body includes a main barrel body (1) and an overflow tank (2), the bottom of the main barrel body (1) is provided with a sand discharge port (7), the outer periphery of the main barrel body (1) is provided with an overflow tank (2), the bottom of the overflow tank (2) has a water outlet (4); A water inlet module includes a uniform flow plate (10) and a water inlet pipe (5), the uniform flow plate (10) is arranged at the lower part of the main barrel body (1) and longitudinally divides the main barrel body (1) into a water inlet cavity and a water washing cavity, a plurality of flow holes are uniformly arranged on the uniform flow plate (10), and the water inlet pipe (5) is arranged at the bottom of the main barrel body (1) and communicates with the water inlet cavity; A feeding module includes a feeding pipe (3) and a guide plate, the feeding pipe (3) is longitudinally arranged at the upper part of the main barrel body (1), the upper end of the feeding pipe (3) has a feeding port, and a plurality of guide plates are arranged at the lower part of the feeding pipe (3) and divide the lower part of the feeding pipe (3) into a plurality of discharging spaces, and the bottom of each discharging space is provided with a discharging port; A washing control module is arranged at the middle part of the main barrel body (1), the washing control module includes at least two flexible kneading belts arranged at intervals, a flow space is formed between adjacent two flexible kneading belts, and the two flexible kneading belts are relatively moved to knead the sand particles in the flow space; A plurality of discharging ports are radially arranged at the outer periphery of the feeding pipe (3); The guide plate includes: A plurality of inner guide plates (13) are arranged in the inner cavity of the feeding pipe (3), the plurality of inner guide plates (13) are arranged at intervals along the horizontal direction, the inner guide plates (13) are arranged obliquely, and the bottom of the inner guide plates (13) is communicated with a discharging port; A plurality of spiral shunt guide plates (14) are annularly arranged at the outer periphery of the feeding pipe (3), a spiral discharging channel is formed by the outer side wall of the feeding pipe (3), the upper end of the spiral discharging channel is communicated with the discharging port, and the discharging port is arranged at the lower end of the spiral discharging channel; The washing control module includes: A fixed frame body includes a fixed seat (111) and an elastic frame, the fixed seat (111) is arranged on the inner side wall of the main barrel body (1), the elastic frame is connected to the fixed seat (111), and the elastic frame has a longitudinal degree of freedom; A moving frame body includes a rotating drive shaft (15) and a rotating frame (18), the rotating drive shaft (15) is longitudinally arranged in the main barrel body (1), the lower end of the rotating drive shaft (15) extends below the discharging port, the rotating frame (18) is connected to the rotating drive shaft (15) and rotates horizontally along with the rotating drive shaft (15); Two flexible kneading belts are respectively connected to the fixed frame body and the rotating frame (18).

2. The foundry sand water washing desander as claimed in claim 1, wherein, A plurality of discharging ports are longitudinally arranged at intervals, the discharging ports are equally spaced along the outer periphery of the feeding pipe (3), and the discharging direction of the discharging port is tangential to the feeding pipe (3).

3. The foundry sand water washing desander as claimed in claim 1, wherein, The flow holes are arranged obliquely along the longitudinal direction.

4. The foundry sand water washing de-sander apparatus of claim 1 wherein, The flexible kneading belt is annular, the height of the flexible kneading belt gradually decreases from the edge to the center, and the flexible kneading belt includes: The flexible sleeve body (118) is a ring-shaped sleeve body, and the working surface of the flexible sleeve body (118) is uniformly distributed with convex structures (16); A plurality of support skeletons (119) are uniformly distributed in the interior of the flexible sleeve body (118), and the support skeletons (119) are connected to the fixed frame body or the movable frame body.

5. A method of washing foundry sand to remove clay, characterised in that, The casting sand water washing mud control device as claimed in claim 1 is adopted; and the following steps are included: S1, water is injected into the main barrel body (1) through the water inlet pipe (5) until it starts to overflow; S2, casting sand is put into the feeding pipe (3) through the feeding inlet, the casting sand is divided into multiple portions by the guide plate, and is discharged to the main barrel body (1) through the discharge ports of different discharge spaces; S3, the sand particles enter the flow space between the two flexible kneading belts and are kneaded by the relatively moving flexible kneading belts; In steps S2 to S3, the water inlet pipe (5) continuously injects water, and the slurry overflows from the upper end of the main barrel body (1) into the overflow tank (2) and is discharged through the water outlet (4) of the overflow tank (2).

6. The foundry sand water washing desliming method according to claim 5, wherein, In step S3, the flexible kneading belts move periodically and reciprocally.

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