A drum-type sand screening machine for casting

Abstract

This invention belongs to the field of foundry sand screening technology, and particularly to a drum-type sand screening machine for foundry use. It includes a frame, on which a housing is fixedly mounted. A screening mechanism one is housed within the housing, and two screening mechanisms two within the screening mechanism one. The screening mechanism one includes a screen cylinder, and the screening mechanism two includes a vortex screen plate disposed within the screen cylinder. The screen cylinder and the vortex screen plate rotate in the same direction, but the rotational speed of the screen cylinder is higher than that of the vortex screen plate. During the rotation of the screen cylinder and the vortex screen plate, the vortex screen plate continuously deforms, rewinds, and resets. During this continuous deformation, rewinding, and reset process, the vortex screen plate strikes the screen cylinder. This invention, by using the vortex screen plate in conjunction with the screen cylinder, can screen more sand per unit time without increasing the diameter and length of the screen cylinder. Under the same volume, the screening efficiency of this application is higher than that of existing traditional drum screens.

Description

Technical Field

[0001] This invention relates to the field of foundry sand screening technology, and in particular to a drum-type sand screening machine for foundry. Background Technology

[0002] In the foundry sand recycling process, screening is a crucial step. Its main purpose is to separate fine dust, incompletely crushed sand clumps, and large foreign objects from the crushed and magnetically separated sand to obtain recycled sand with uniform particle size and high purity. Currently, the most widely used screening equipment in the industry is the drum screen. The drum screen uses its slightly inclined rotating cylinder to tumble and scatter the sand inside. Qualified sand particles smaller than the screen mesh size pass through the screen holes, while large impurities are discharged from the end of the cylinder, thus achieving grading.

[0003] However, existing rotary drum screens have low processing capacity per unit area. Since the sand material moves slowly forward within the screen by relying on the inclined angle of the drum, its travel speed is slow, resulting in a limited amount of sand material passing through the screen surface per unit time. To increase output, it is usually necessary to increase the diameter and length of the drum, resulting in a large equipment size and low screen utilization rate. On the entire screening surface of the drum, only the bottom 1 / 3 to 1 / 2 area is a truly effective working area, while the upper screen surface basically does not participate in screening, resulting in material waste. Therefore, a rotary drum sand screening machine for casting is proposed. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention proposes a drum-type sand screening machine for casting.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a drum-type sand screening machine for casting, comprising a frame, a housing fixedly installed on the frame, a screening mechanism I inside the housing, and two screening mechanisms II inside the screening mechanism I. The screening mechanism I includes a screen cylinder, and the screening mechanism II includes a vortex screen plate disposed inside the screen cylinder. The screen cylinder and the vortex screen plate rotate in the same direction, and the rotation speed of the screen cylinder is higher than that of the vortex screen plate. During the rotation of the screen cylinder and the vortex screen plate, the vortex screen plate will continuously deform, rewind, and reset. During the continuous deformation, rewind, and reset process, the vortex screen plate will strike the screen cylinder, and the impact force will be fed back to the vortex screen plate. A feed pipe extending into the screen cylinder is installed through one side of the housing, and a discharge port II is provided at the bottom of the housing.

[0006] Preferably, the frame and housing are provided with a drive mechanism, the drive mechanism includes two bearing seats fixed on the top of the frame, the same rotating shaft is rotatably mounted through the two bearing seats, the rotating shaft passes through the housing and is rotatably connected to the housing, the rotating shaft is coaxially arranged with the screen cylinder, and three cross frames are fixedly installed inside the screen cylinder at equal intervals, the three cross frames are rotatably sleeved on the rotating shaft, and the screening mechanism two is located between the corresponding two cross frames.

[0007] Preferably, the drive mechanism further includes a second motor fixed to the top of the frame. The end of the rotating shaft near the second motor is connected to the output shaft of the second motor via a sprocket assembly. The second motor drives the rotating shaft to rotate via the sprocket assembly. The first screening mechanism further includes an end face gear ring sleeved on the outside of the screen cylinder and a first motor fixed to the outside of the housing. Gears are meshed on the end face gear ring. The output shaft of the first motor rotates and extends into the housing and is fixedly connected to the gears.

[0008] Preferably, the bottom of the housing is provided with two discharge ports, which are located between the feed pipe and the discharge port, and are respectively located below the corresponding screening mechanism. The top of the housing is provided with two dust discharge pipes.

[0009] Preferably, an annular baffle is fixedly installed at one end of the screen cylinder near the feed pipe, and a solid part is provided at the other end of the screen cylinder away from the annular baffle.

[0010] Preferably, the second screening mechanism includes an annular blocking plate fixedly sleeved on a rotating shaft. An annular plate one is provided on the outer side of the annular blocking plate. An open cylinder is fixedly installed between the inner side of the annular plate one and the outer side of the annular blocking plate. An annular plate two is fixedly installed at the end of the open cylinder away from the annular plate one. Both the annular plate one and the annular plate two are rotatably connected to the inner wall of the screen cylinder. A vortex screen plate is provided between the annular plate one and the annular plate two. The side of the vortex screen plate closest to the center is fixedly connected to one side of the open cylinder.

[0011] Preferably, an auger is fixedly installed on the inner wall of the open cylinder, and the two sides of the vortex screen plate are slidably connected to annular plate one and annular plate two, respectively. Multiple feed ports are opened on the side of annular plate one.

[0012] Preferably, the screening mechanism 2 further includes an arc plate 1 and multiple arc plates 2. One side of the arc plate 1 is fixedly connected to the side of the vortex screen plate away from the center. Multiple arc plates 2 are fixed in a circumferential array on the inner wall of the screen cylinder. Multiple rectangular holes with equal spacing are opened on the arc plate 1. Multiple triangular blocks with equal spacing are fixedly installed on the inner side of the multiple arc plates 2. The multiple triangular blocks and the multiple rectangular holes are compatible.

[0013] Preferably, the frame is inclined, with the side of the frame closer to the feed pipe higher than the side closer to the second motor.

[0014] Preferably, an inspection port is provided on the side of the housing, and a door is rotatably installed on the inspection port.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention uses a vortex screen plate in conjunction with a screen cylinder to screen more sand materials per unit time without increasing the diameter and length of the screen cylinder. Under the same volume, the screening efficiency of this application is higher than that of the existing traditional drum screen.

[0017] By continuously rewinding and resetting the vortex screen plate during the screening process, an impact force can be applied to the screen cylinder and the vortex screen plate itself, which can knock down some of the sand material blocking the filter holes and clear the screen cylinder and the vortex screen plate.

[0018] Furthermore, the continuously retracting and resetting vortex screen plate during the screening process can shake the sand material located within it, and the sand material tumbles inside the vortex screen plate, thereby accelerating the screening of the sand material. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a drum-type sand screening machine for casting proposed in this invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the overall structure of a drum-type sand screening machine for casting proposed in this invention. Figure 2 ;

[0021] Figure 3 This is a side sectional view of a drum-type sand screening machine for casting proposed in this invention;

[0022] Figure 4 This is a partial structural schematic diagram of a drum-type sand screening machine for casting proposed in this invention;

[0023] Figure 5 This is a partial side sectional view of a drum-type sand screening machine for casting proposed in this invention;

[0024] Figure 6 This is a schematic diagram of the screening mechanism two and the partial rotating shaft in a drum-type sand screening machine for casting proposed in this invention. Figure 1 ;

[0025] Figure 7 This is a schematic diagram of the screening mechanism two and the partial rotating shaft in a drum-type sand screening machine for casting proposed in this invention. Figure 2 ;

[0026] Figure 8 This is a partial structural diagram of the screening mechanism two in a drum-type sand screening machine for casting proposed in this invention;

[0027] Figure 9 for Figure 8 A magnified structural diagram of part A in the middle;

[0028] Figure 10 This is a partial side view of the screening mechanism two in a drum-type sand screening machine for casting proposed in this invention.

[0029] In the diagram: 1. Frame; 2. Shell; 3. Screening mechanism one; 4. Feed pipe; 5. Drive mechanism; 6. Screening mechanism two;

[0030] 21. Dust exhaust pipe; 22. Discharge port 1; 23. Discharge port 2; 24. Inspection port; 25. Bin door;

[0031] 31. Screen cylinder; 32. Ring baffle; 33. Motor 1; 34. End face gear ring; 35. Gear; 36. Solid part;

[0032] 51. Shaft seat; 52. Rotating shaft; 53. Cross frame; 54. Motor II; 55. Sprocket assembly;

[0033] 61. Annular plate one; 611. Feed inlet; 62. Annular plate two; 63. Opening cylinder; 64. Vortex screen plate; 65. Ring blocking plate; 66. Arc plate one; 661. Rectangular hole; 67. Arc plate two; 671. Triangular block; 68. Screwdriver. Detailed Implementation

[0034] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please refer to Figure 1 - Figure 10 This invention provides a technical solution: a drum-type sand screening machine for casting, including a frame 1, a housing 2 fixedly installed on the frame 1, a screening mechanism 3 inside the housing 2, and two screening mechanisms 6 inside the screening mechanism 3. The screening mechanism 3 includes a screen cylinder 31, and the screening mechanism 6 includes a vortex screen plate 64 disposed inside the screen cylinder 31. The screen cylinder 31 and the vortex screen plate 64 rotate in the same direction, and the rotation speed of the screen cylinder 31 is higher than that of the vortex screen plate 64. During the rotation of the screen cylinder 31 and the vortex screen plate 64, the vortex screen plate 64 will continuously deform, rewind, and reset. During the continuous deformation, rewinding, and reset process, the vortex screen plate 64 will strike the screen cylinder 31, and the shock force of the strike will be fed back to the vortex screen plate 64. A feed pipe 4 extending into the screen cylinder 31 is fixedly installed through one side of the housing 2, and a discharge port 23 is provided at the bottom of the housing 2.

[0036] Furthermore, such as Figure 4 and Figure 5 As shown, the sieve cylinder 31 is provided with two sieve sections, and the diameter of the filter holes on the right sieve section is smaller than that on the left sieve section. The two vortex sieve plates 64 are located in the corresponding sieve sections, and the diameter of the filter holes on the two vortex sieve plates 64 is equal to that of the filter holes in the corresponding sieve sections.

[0037] Preferably, a drive mechanism 5 is provided on the frame 1 and the housing 2. The drive mechanism 5 includes two bearing seats 51 fixed on the top of the frame 1. The same rotating shaft 52 is rotatably mounted through the two bearing seats 51. The rotating shaft 52 passes through the housing 2 and is rotatably connected to the housing 2. The rotating shaft 52 is coaxially arranged with the screen cylinder 31. Three cross frames 53 are fixedly installed inside the screen cylinder 31 and are evenly distributed. The three cross frames 53 are rotatably sleeved on the rotating shaft 52. The screening mechanism 6 is located between the corresponding two cross frames 53.

[0038] Preferably, the drive mechanism 5 also includes a second motor 54 fixed to the top of the frame 1. The end of the rotating shaft 52 near the second motor 54 is connected to the output shaft of the second motor 54 through a sprocket set 55. The second motor 54 drives the rotating shaft 52 to rotate through the sprocket set 55. The screening mechanism 3 also includes an end face gear ring 34 sleeved on the outside of the screen cylinder 31 and a first motor 33 fixed on the outside of the housing 2. A gear 35 is meshed on the end face gear ring 34. The output shaft of the first motor 33 rotates and extends into the housing 2 and is fixedly connected to the gear 35.

[0039] Furthermore, the sprocket assembly 55 includes two sprockets and a chain sleeved on the two sprockets. The two sprockets are respectively fixedly connected to the output shaft of the second motor 54 and the end of the rotating shaft 52.

[0040] Preferably, the bottom of the housing 2 is provided with two discharge ports 22, which are located between the feed pipe 4 and the discharge port 23. The two discharge ports 22 are respectively located below the corresponding screening mechanism 6. The top of the housing 2 is provided with two dust discharge pipes 21.

[0041] Preferably, a ring baffle 32 is fixedly installed at one end of the screen cylinder 31 near the feed pipe 4, and a solid part 36 is provided at the other end of the screen cylinder 31 away from the ring baffle 32.

[0042] Preferably, the screening mechanism 6 includes an annular blocking plate 65 fixedly sleeved on the rotating shaft 52. An annular plate 61 is provided on the outer side of the annular blocking plate 65. An open cylinder 63 is fixedly installed between the inner side of the annular plate 61 and the outer side of the annular blocking plate 65. An annular plate 62 is fixedly installed at the end of the open cylinder 63 away from the annular plate 61. Both the annular plate 61 and the annular plate 62 are rotatably connected to the inner wall of the screen cylinder 31. A vortex screen plate 64 is provided between the annular plate 61 and the annular plate 62. The side of the vortex screen plate 64 closest to the center is fixedly connected to one side of the open cylinder 63.

[0043] Preferably, an auger 68 is fixedly installed on the inner wall of the open cylinder 63, and the two sides of the vortex screen plate 64 are slidably connected to the first annular plate 61 and the second annular plate 62 respectively. The side of the first annular plate 61 has multiple feed ports 611.

[0044] Furthermore, the rotation of the rotating shaft 52 can drive the ring blocking plate 65 to rotate, and the ring blocking plate 65 in turn drives the opening cylinder 63, the first annular plate 61 and the second annular plate 62 to rotate synchronously, while the auger 68 and the vortex screen plate 64 rotate synchronously with the opening cylinder 63.

[0045] Preferably, the screening mechanism 2 6 further includes an arc plate 1 66 and multiple arc plates 2 67. One side of the arc plate 1 66 is fixedly connected to the side of the vortex screen plate 64 away from the center. The multiple arc plates 2 67 are fixed in a circumferential array on the inner wall of the screen cylinder 31. Multiple rectangular holes 661 are evenly distributed on the arc plate 1 66. Multiple triangular blocks 671 are evenly distributed on the inner side of the multiple arc plates 2 67. The multiple triangular blocks 671 and the multiple rectangular holes 661 are adapted to each other.

[0046] Furthermore, such as Figures 8-10 As shown, when the vortex screen plate 64 and the screen cylinder 31 rotate clockwise, and the rotation speed of the screen cylinder 31 is higher than that of the vortex screen plate 64, multiple triangular blocks 671 on the arc plate 67, which gradually comes into contact with the arc plate 66, will gradually get stuck into multiple rectangular holes 661 of the arc plate 66. Then, as the arc plate 67 and the arc plate 66 separate, under the action of the hypotenuse of the triangular blocks 671, the distance between the arc plate 67 and the arc plate 66 will continuously increase. Since multiple triangular blocks 671 hook the arc plate 66, during this process, as the screen cylinder 31 continues to rotate clockwise, the arc plate 64 will be pulled away from the center by the arc plate 66, so that the rotation speed of the end of the vortex screen plate 64 away from the center is higher than that of the end close to the center, which will cause the vortex screen plate 64 to be passively rolled up.

[0047] Since the inner wall of the rectangular hole 661 away from the vortex screen plate 64 has an inclined surface that matches the hypotenuse of the triangular block 671, as the vortex screen plate 64 is passively rolled up, the end of the vortex screen plate 64 away from the center will gradually move towards the end closer to the center. At this time, the inclined surface of the inner wall of the rectangular hole 661 away from the vortex screen plate 64 will slide along the hypotenuse of the triangular block 671.

[0048] As the vortex screen plate 64 is passively wound up, the end of the vortex screen plate 64 away from the center will cause the arc plate 66 to gradually separate from the inner wall of the arc plate 67 and continue to move along the hypotenuse of the triangular block 671 until the separation is completed. After the arc plate 66 is completely separated from the multiple triangular blocks 671, the passively wound vortex screen plate 64 will spring back to its original position. After the vortex screen plate 64 is reset and unfolded, the arc plate 66 will once again adhere to the inner wall of the screen cylinder 31.

[0049] Preferably, the frame 1 is inclined, with the side of the frame 1 closer to the feed pipe 4 being higher than the side closer to the motor 54.

[0050] Preferably, an inspection port 24 is provided on the side of the housing 2, and a door 25 is rotatably installed on the inspection port 24.

[0051] Furthermore, the inspection port 24, in conjunction with the compartment door 25, facilitates the viewing of the interior of the housing 2 and the maintenance and repair of the internal components.

[0052] In this embodiment: During use, motor 2 54 and motor 1 33 are started. Motor 2 54 drives the two screening mechanisms 2 6 to rotate synchronously through sprocket assembly 55 and cross frame 53. Motor 1 33 drives the screen cylinder 31 to rotate through gear 35 and end face gear ring 34. The two screening mechanisms 2 6 and screen cylinder 31 rotate in the same direction, and the rotation speed of screen cylinder 31 is higher than the rotation speed of the two screening mechanisms 2 6. Figure 5 - Figure 10 As shown, at this time, the screen cylinder 31 and the two screening mechanisms 6 all rotate clockwise;

[0053] The sand is fed into the feed pipe 4 and falls into the screen cylinder 31. As the screen cylinder 31 rotates, it can cause the sand at the bottom to tumble. A portion of the sand that meets the target particle size will pass through the filter holes on the screen cylinder 31 and fall into the discharge port 22 below and be discharged. Another portion of the sand will pass through the multiple feed ports 611 on the adjacent screening mechanism 6 and enter between the corresponding annular plate 61 and annular plate 62.

[0054] The sand entering between the first annular plate 61 and the second annular plate 62 will initially be tumbled and screened by the clockwise rotating screen cylinder 31. The clockwise rotating vortex screen plate 64 can scoop up the sand accumulated at the bottom of the screen cylinder 31. As the vortex screen plate 64 rotates clockwise, it can cause the sand inside to tumble and can transport the sand scooped up by the vortex screen plate 64 toward the open cylinder 63. During this process, the sand that meets the target particle size will pass through the filter holes on the screen cylinder 31 and the vortex screen plate 64 and fall into the feed port 22 below.

[0055] The sand falling into the open cylinder 63 will be conveyed by the auger 68 from right to left and discharged from the end of the open cylinder 63 away from the annular plate 61, falling back to the bottom of the screen cylinder 31. After that, this part of the sand will be screened by another set of screening mechanisms 6 and then enter the solid part 36 and finally fall into the discharge port 23.

[0056] like Figure 10 As shown, when the screen cylinder 31 and the vortex screen plate 64 rotate clockwise simultaneously, and the rotation speed of the screen cylinder 31 is higher than that of the vortex screen plate 64, with the cooperation of multiple sets of rectangular holes 661 and triangular blocks 671, the vortex screen plate 64 will be rolled up as the arc plate 66 passes through the arc plate 67. After the arc plate 66 passes the arc plate 67, the rolled-up vortex screen plate 64 will quickly spring back to its original position. During the continuous rolling, resetting and springback process of the vortex screen plate 64, the vortex screen plate 64 will strike the screen cylinder 31, and the striking force will be fed back to the vortex screen plate 64. The vortex screen plate 64 will also cause the sand inside to shake, thereby accelerating the screening of the sand.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A drum-type sand screening machine for casting, comprising a frame (1), characterized in that: A housing (2) is fixedly installed on the frame (1). A screening mechanism (3) is provided inside the housing (2). Two screening mechanisms (6) are provided inside the screening mechanism (3). The screening mechanism (3) includes a screen cylinder (31). The screening mechanism (6) includes a vortex screen plate (64) disposed inside the screen cylinder (31). The screen cylinder (31) and the vortex screen plate (64) rotate in the same direction, and the rotation speed of the screen cylinder (31) is higher than that of the vortex screen plate (64). During the rotation of the screen cylinder (31) and the vortex screen plate (64), the vortex screen plate (64) will continuously deform, rewind, and reset. During the continuous deformation, rewind, and reset of the vortex screen plate (64), the vortex screen plate (64) will strike the screen cylinder (31), and the shock force of the strike will be fed back to the vortex screen plate (64). A feed pipe (4) extending into the screen cylinder (31) is fixedly installed through one side of the housing (2). The bottom of the housing (2) is provided with a discharge port two (23). The frame (1) and the housing (2) are provided with a drive mechanism (5). The drive mechanism (5) includes two bearing seats (51) fixed on the top of the frame (1). The same rotating shaft (52) is rotatably installed on the two bearing seats (51). The rotating shaft (52) passes through the housing (2) and is rotatably connected to the housing (2). The rotating shaft (52) is coaxially arranged with the screen cylinder (31). Three cross frames (53) are fixedly installed in the screen cylinder (31) at equal intervals. The three cross frames (53) are rotatably sleeved on the rotating shaft (52). The screening mechanism (6) is located between the corresponding two cross frames (53). The bottom of the housing (2) is provided with two discharge ports one (22), which are located between the feed pipe (4) and the discharge port two (23). The two discharge ports one (22) are located below the corresponding screening mechanism two (6); The second screening mechanism (6) includes an annular blocking plate (65) fixedly sleeved on the rotating shaft (52). An annular plate (61) is provided on the outer side of the annular blocking plate (65). An open cylinder (63) is fixedly installed between the inner side of the annular plate (61) and the outer side of the annular blocking plate (65). An annular plate (62) is fixedly installed at the end of the open cylinder (63) away from the annular plate (61). Both the annular plate (61) and the annular plate (62) are rotatably connected to the inner wall of the screen cylinder (31). A vortex screen plate (64) is provided between the annular plate (61) and the annular plate (62). The side of the vortex screen plate (64) closest to the center is fixedly connected to one side of the open cylinder (63). An auger (68) is fixedly installed on the inner wall of the opening cylinder (63). The two sides of the vortex screen plate (64) are slidably connected to the first annular plate (61) and the second annular plate (62) respectively. The side of the first annular plate (61) is provided with multiple feed inlets (611). The second screening mechanism (6) also includes an arc plate (66) and multiple arc plates (67). One side of the arc plate (66) is fixedly connected to the side of the vortex screen plate (64) away from the center. Multiple arc plates (67) are fixed in a circumferential array on the inner wall of the screen cylinder (31). Multiple rectangular holes (661) with equal spacing are opened on the arc plate (66). Multiple triangular blocks (671) with equal spacing are fixedly installed on the inner side of the multiple arc plates (67). The multiple triangular blocks (671) and the multiple rectangular holes (661) are compatible.

2. The casting drum-type sand screening machine according to claim 1, characterized in that: The drive mechanism (5) also includes a second motor (54) fixed on the top of the frame (1). The end of the rotating shaft (52) near the second motor (54) is connected to the output shaft of the second motor (54) through a sprocket set (55). The second motor (54) drives the rotating shaft (52) to rotate through the sprocket set (55). The screening mechanism (3) also includes an end face gear ring (34) sleeved on the outside of the screen cylinder (31) and a first motor (33) fixed on the outside of the housing (2). A gear (35) is meshed on the end face gear ring (34). The output shaft of the first motor (33) rotates and extends into the housing (2) and is fixedly connected to the gear (35).

3. The casting drum-type sand screening machine according to claim 1, characterized in that: The top of the housing (2) is provided with two dust exhaust pipes (21).

4. A drum-type sand screening machine for casting according to claim 1, characterized in that: A ring baffle (32) is fixedly installed at one end of the screen cylinder (31) near the feed pipe (4), and a solid part (36) is provided at the other end of the screen cylinder (31) away from the ring baffle (32).

5. A casting drum-type sand screening machine according to claim 2, characterized in that: The frame (1) is inclined, and the side of the frame (1) near the feed pipe (4) is higher than the side near the motor (54).

6. A drum-type sand screening machine for casting according to claim 1, characterized in that: The side of the housing (2) is provided with an inspection port (24), and a door (25) is rotatably installed on the inspection port (24).

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