A continuous sand mixer

Abstract

This invention relates to a continuous sand mixer, comprising a fixed base and a swing frame. Swing auxiliary springs are connected to the four corners of the bottom of the swing frame, and the bottom ends of the four swing auxiliary springs are connected to the fixed base. A reciprocating motor is mounted on the fixed base. A reciprocating shaft is fixedly connected to the edge of the swing frame, and the reciprocating motor and the reciprocating shaft are connected via a synchronous belt. Two mounting brackets are fixedly mounted on the top side of the swing frame, and a one-way shaft is rotatably mounted on each bracket. The one-way shaft is arranged laterally. A drive motor is mounted on the swing frame to drive the one-way shaft to rotate. A drum is fixedly connected to the one-way shaft, and the one-way shaft is fixedly inserted through two end caps on the drum. A mixing cage is slidably mounted on the one-way shaft. The mixing cage is cylindrical and coaxially arranged with the drum. The mixing cage has several circumferential mixing strips. This invention can simultaneously perform circumferential and axial mixing of materials, thereby enabling more uniform mixing.

Description

Technical Field

[0001] This invention relates to the field of molding sand production technology, specifically to a continuous sand mixer. Background Technology

[0002] Molding sand for foundry is prepared by mixing raw sand, binder, and curing agent in a certain proportion and stirring until homogeneous. During the mixing process, it is crucial to ensure the uniform distribution of all components to guarantee consistent molding sand properties. Furthermore, the binder must be evenly coated on the surface of each sand grain to form a bonding film, ensuring the subsequent molding sand achieves the required integration. Therefore, the mixture must be thoroughly stirred during the mixing process to ensure all components are evenly mixed.

[0003] In the existing technology, a rotor-type sand mixer is generally used to mix the above materials. Since the rotor only makes a simple circumferential motion, the material only moves circumferentially with the rotor, and the mixing effect is limited, resulting in uneven mixing of the mixed material, which affects the quality of the subsequent molding sand. Summary of the Invention

[0004] The purpose of this invention is to provide a continuous sand mixer that can simultaneously perform circumferential and axial mixing of materials, thereby enabling more uniform mixing of materials.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A continuous sand mixer includes a fixed base and a swing frame. Swing auxiliary springs are connected to the four corners of the bottom of the swing frame, and the bottom ends of the four swing auxiliary springs are connected to the fixed base. A reciprocating motor is mounted on the fixed base. A reciprocating shaft is fixedly connected to the edge of the swing frame, and the reciprocating motor and the reciprocating shaft are connected via a synchronous belt. Two mounting brackets are fixedly mounted on the top side of the swing frame, and one-way rotating shafts are rotatably mounted on the two mounting brackets. The one-way rotating shafts are arranged laterally. A drive motor is mounted on the swing frame to drive the one-way rotating shafts to rotate. A roller is fixedly connected to the one-way rotating shafts. A one-way rotating shaft is fixedly installed through the two end caps of the drum. A stirring cage is slidably fitted onto the one-way rotating shaft. The stirring cage is cylindrical and coaxial with the drum. The stirring cage has several circumferential stirring bars, which are arranged circumferentially. Each circumferential stirring bar is connected to an axial stirring ring, which is arranged axially. Several buffer springs are fixed to the inner walls of the two end caps of the drum. The buffer springs at the same end are arranged in a circumferential array. Both ends of the stirring cage are provided with contact rings, which correspond to the circumferential array shape of the buffer springs.

[0006] Specifically, the four swing auxiliary springs are arranged in groups of two, and the two groups of swing auxiliary springs are symmetrical about the vertical plane containing the reciprocating axis.

[0007] Specifically, both mounting brackets are equipped with swivel bearings, and the two swivel bearings together support the unidirectional rotating shaft.

[0008] Specifically, the outer wall of the roller is provided with a feed inlet and a discharge outlet, and both the feed inlet and the discharge outlet are provided with cover plates.

[0009] Specifically, each of the two axial stirring rings at both ends of the stirring cage is fixedly connected to a mounting ring plate, and each of the two mounting ring plates is fixedly fitted with a sliding sleeve. The sliding sleeve is slidably fitted onto a one-way rotating shaft, which is provided with a sliding key. The sliding sleeve is provided with a sliding groove, and the sliding key and the sliding groove are slidably engaged.

[0010] Specifically, spring mounting rings are fixed to the inner walls of both end caps of the roller. The spring mounting rings and contact rings are coaxially arranged with the end plates. Multiple buffer springs are fixed to the inner walls of the spring mounting rings, and the multiple buffer springs are evenly distributed along the circumference.

[0011] Specifically, there are four circumferential stirring bars, which are evenly distributed along the circumference.

[0012] Specifically, there are five axial stirring rings, which are evenly distributed along the axial direction.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: When the drum swings to a position where one end is tilted downwards and maintains that tilt angle, the mixing cage, under the influence of gravity, slides along the one-way axis towards the tilted downwards end (the mounting rings are fixedly fitted with sliding sleeves, which are slidably engaged with the one-way axis). During the sliding of the mixing cage along the one-way axis, each axial mixing ring moves axially relative to the mixture inside the drum, thus axially agitating the mixture. In this way, the mixture inside the drum is simultaneously subjected to the circumferential agitation of the circumferential mixing bars and the axial agitation of the axial mixing rings, greatly improving the mixing effect, resulting in more uniform mixing and improved molding sand quality. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A three-dimensional view of a continuous sand mixer; Figure 2 This is one of the partial views of a continuous sand mixer; Figure 3 This is the second partial view of a continuous sand mixer; Figure 4 This is one of the combined views of the swing frame and the roller; Figure 5 This is the second view showing the combined state of the swing frame and the rollers. Figure 6 This is a three-dimensional view of the drum; Figure 7 One of the internal views of the drum; Figure 8 This is the second internal view of the drum.

[0016] In the picture: 11. Fixed base; 12. Reciprocating motor; 21. Swing frame; 22. Swing auxiliary spring; 23. Reciprocating shaft; 31. Mounting bracket; 311. Rotary bearing; 32. One-way rotating shaft; 33. Drum; 331. Feed inlet; 332. Discharge outlet; 34. Spring mounting ring; 35. Buffer spring; 36. Drive motor; 4. Mixing cage frame; 41. Circumferential mixing bars; 42. Axial mixing ring; 43. Contact ring plate; 44. Mounting ring plate; 45. Sliding sleeve; 5. Receiving hopper. Detailed Implementation

[0017] 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.

[0018] See Figures 1 to 3 A continuous sand mixer includes a fixed base 11 and a swing frame 21. Swing auxiliary springs 22 are connected to the four corners of the bottom of the swing frame 21, and the bottom ends of the four swing auxiliary springs 22 are connected to the fixed base 11. The fixed base 11 is equipped with a reciprocating motor 12, and a reciprocating shaft 23 is fixedly connected to the edge of the swing frame 21. The reciprocating motor 12 and the reciprocating shaft 23 are connected by a synchronous belt.

[0019] Two mounting brackets 31 are fixedly connected to the top side of the swing frame 21. Each mounting bracket 31 is rotatably equipped with a one-way rotating shaft 32, which is arranged laterally. The swing frame 21 is equipped with a drive motor 36, which drives the one-way rotating shaft 32 to rotate. A roller 33 is fixedly connected to the one-way rotating shaft 32, and the one-way rotating shaft 32 is fixedly inserted through two end caps on the roller 33. A stirring cage 4 is slidably fitted onto the one-way rotating shaft 32. The stirring cage 4 is cylindrical and coaxially arranged with the roller 33. The stirring cage 4 has several circumferential stirring bars 41, which are arranged circumferentially. Each circumferential stirring bar 41 is connected to an axial stirring ring 42, which are arranged axially.

[0020] See Figure 7 Several buffer springs 35 are fixed to the inner walls of both end caps of the drum 33, and the buffer springs 35 at the same end are arranged in a circumferential array. Both ends of the stirring cage 4 are provided with contact ring plates 43, and the shape of the contact ring plates 43 corresponds to the circumferential array shape of the buffer springs 35.

[0021] Specifically, see Figure 4 The four swing auxiliary springs 22 are arranged in groups of two, and the two groups of swing auxiliary springs 22 are symmetrical about the vertical plane where the reciprocating axis 23 is located.

[0022] Specifically, see Figure 5 , Figure 6 Both mounting brackets 31 are equipped with rotating bearings 311, and the two rotating bearings 311 together support the unidirectional rotating shaft 32.

[0023] Specifically, see Figure 6 The outer wall of the roller 33 is provided with a feed inlet 331 and a discharge outlet 332, and both the feed inlet 331 and the discharge outlet 332 are provided with cover plates.

[0024] Specifically, see Figure 7 , Figure 8 The axial stirring rings 42 at both ends of the stirring cage frame 4 are fixedly connected with mounting ring pieces 44. Each mounting ring piece 44 is fixedly fitted with a sliding sleeve 45. The sliding sleeve 45 is slidably mounted on a one-way rotating shaft 32. The one-way rotating shaft 32 is provided with a sliding key. The sliding sleeve 45 is provided with a sliding groove. The sliding key and the sliding groove are slidably engaged.

[0025] Specifically, see Figure 7 , Figure 8 Spring mounting rings 34 are fixed to the inner walls of both ends of the roller 33. The spring mounting rings 34 and the contact rings 43 are coaxially arranged with the end plates. Multiple buffer springs 35 are fixed to the inner walls of the spring mounting rings 34. The multiple buffer springs 35 are evenly distributed along the circumference.

[0026] The working principle of this invention is as follows: The foundry sand, binder, and curing agent are fed into the drum 33 through the feed inlet 331 in proportion (see...). Figure 6 Then, the drive motor 36 drives the one-way rotating shaft 32 to rotate, thereby driving the drum 33 to rotate (the drum 33 is fixedly connected to the one-way rotating shaft 32), and driving the stirring cage 4 to rotate, so as to stir and mix the mixture inside the drum 33. During the stirring process, each circumferential stirring bar 41 rotates circumferentially, thereby stirring the mixture circumferentially (see...). Figure 7 , Figure 8 ).

[0027] During the rotation of drum 33, reciprocating motor 12 drives reciprocating shaft 23 to oscillate intermittently left and right at a certain angle (see...). Figure 5 This causes the swing frame 21 to swing left and right reciprocally around the central axis of the reciprocating rotation shaft 23, and maintain that tilt angle for a period of time after tilting at a certain angle. Therefore, the left and right sets of swing auxiliary springs 22 at the bottom of the swing frame 21 will alternately stretch and contract, for example (see...). Figure 5 When the swing frame 21 swings to its left side tilting downwards, the left set of swing auxiliary springs 22 is compressed, while the right set is stretched; when the swing frame 21 swings to its right side tilting downwards, the right set of swing auxiliary springs 22 is compressed, while the left set is stretched. This allows the roller 33 to swing intermittently left and right along with the swing frame 21, maintaining the corresponding tilt angle for a period of time. The alternating stretching and contraction of the two sets of swing auxiliary springs 22 stabilizes the swing frame 21, preventing unnecessary shaking.

[0028] When roller 33 swings to a position where one end is tilted downwards and maintains that tilt angle (in conjunction with...) Figure 7 , Figure 8 The mixing cage 4, under the influence of gravity, slides along the one-way rotating shaft 32 towards its inclined downward end (the mounting ring 44 is fixedly fitted with a sliding sleeve 45, which is slidably engaged with the one-way rotating shaft 32). During the sliding of the mixing cage 4 along the one-way rotating shaft 32, each axial stirring ring 42 moves axially relative to the mixture inside the drum 33, thereby axially agitating the mixture. Thus, the mixture inside the drum 33 is simultaneously subjected to the circumferential stirring action of the circumferential stirring strips 41 and the axial action of the axial stirring rings 42, greatly improving the mixing effect, resulting in more uniform mixing and improved molding sand quality.

[0029] When the stirring cage 4 slides along the one-way rotating shaft 32 to the inner wall of the end cover, the contact ring 43 of the stirring cage 4 will touch each buffer spring 35 to avoid direct impact on the inner wall of the end cover.

[0030] During operation, the reciprocating intermittent oscillation of the drum 33, the rotation of the drum 33, and the sliding of the mixing cage 4 along the unidirectional rotating shaft 32 will all generate vibration. The four swing auxiliary springs 22 can absorb the vibration and prevent the vibration from being transmitted to the fixed base 11 and other parts of the machine body.

[0031] After mixing is complete, the mixture inside drum 33 exits through outlet 332 (see...) Figure 6 The material is discharged and then enters the receiving hopper 5 (see...). Figure 1 , Figure 2 Then the material can be discharged.

[0032] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A continuous sand mixer, characterized in that: The system includes a fixed base and a swing frame. Swing auxiliary springs are connected to the four bottom corners of the swing frame, and the bottom ends of the four swing auxiliary springs are connected to the fixed base. The fixed base is equipped with a reciprocating motor. A reciprocating shaft is fixedly connected to the edge of the swing frame, and the reciprocating motor and the reciprocating shaft are connected via a synchronous belt. Two mounting brackets are fixedly connected to the top side of the swing frame, and each mounting bracket is rotatably equipped with a one-way shaft. The one-way shaft is arranged laterally. The swing frame is equipped with a drive motor, which drives the one-way shaft to rotate. A roller is fixedly connected to the one-way shaft. The two end caps of the drum are fixedly installed. A stirring cage is slidably fitted on the one-way rotating shaft. The stirring cage is cylindrical and coaxial with the drum. The stirring cage has several circumferential stirring bars, which are arranged circumferentially. Each circumferential stirring bar is connected to an axial stirring ring, which is arranged axially. Several buffer springs are fixed to the inner walls of the two end caps of the drum. The buffer springs at the same end are arranged in a circumferential array. Both ends of the stirring cage are provided with contact rings, which correspond to the circumferential array shape of the buffer springs.

2. The continuous sand mixer according to claim 1, characterized in that: The four swing auxiliary springs are arranged in pairs, and the two pairs of swing auxiliary springs are symmetrical about the vertical plane containing the reciprocating axis.

3. The continuous sand mixer according to claim 1, characterized in that: Both mounting brackets are equipped with swivel bearings, and the two swivel bearings together support the unidirectional shaft.

4. The continuous sand mixer according to claim 1, characterized in that: The outer wall of the roller is provided with a feed inlet and a discharge outlet, and both the feed inlet and the discharge outlet are provided with cover plates.

5. The continuous sand mixer according to claim 1, characterized in that: The axial stirring rings at both ends of the stirring cage are fixedly connected to mounting ring plates. Each mounting ring plate is fixedly fitted with a sliding sleeve. The sliding sleeve is slidably fitted onto a one-way rotating shaft. The one-way rotating shaft is provided with a sliding key, and the sliding sleeve is provided with a sliding groove. The sliding key and the sliding groove are slidably engaged.

6. The continuous sand mixer according to claim 5, characterized in that: Spring mounting rings are fixed to the inner walls of both end caps of the roller. The spring mounting rings and contact rings are coaxially arranged with the end plates. Multiple buffer springs are fixed to the inner walls of the spring mounting rings, and the multiple buffer springs are evenly distributed along the circumference.

7. The continuous sand mixer according to claim 1, characterized in that: There are four circumferential stirring bars, which are evenly distributed along the circumference.

8. The continuous sand mixer according to claim 1, characterized in that: There are five axial stirring rings, which are evenly distributed along the axial direction.

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