Vibrating screen for vertical sand spraying machine

Abstract

The vibrating screen for the vertical sand spraying machine comprises a screen frame, a screen plate, a drainage partition plate, a vibrator and a flow guide pipe, the screen plate is arranged at the bottom of the screen frame, screen holes are evenly formed in the screen frame and the screen plate respectively, and the vibrator is arranged on the outer wall of one side of the screen frame; an integral structure formed by connecting the screen frame and the screen plate is obliquely arranged, the drainage partition plate is arranged in the integral structure formed by connecting the screen frame and the screen plate, and the portions, located on the two sides of the drainage partition plate, of the screen plate are provided with a feeding position and the flow guide pipe correspondingly; an opening is formed in the side, away from the feeding position, of the drainage partition plate. The vibrating screen has the advantages that the vibrating screen is simple in overall structural design, effective separation of sand grains and sand bumps is achieved with extremely low cost, the blocking frequency of the screen plate is remarkably reduced, the noise reduction effect is greatly improved, the failure rate of a sand spraying machine is reduced, and uniformity in the sand spraying process is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to investment precision casting coating shell technology field especially, relates to a vertical sand spraying machine vibration screen. BACKGROUND

[0002] The investment precision casting shell is mainly the process that wax mould model passes through multilayer sticky pulp, hangs sand and dries, currently the sand spraying mainly adopts the vertical sand spraying machine of rain spraying type, the sand material in this sand spraying machine is reciprocating cycle use, the used return material in the sand spraying machine will be together with the new sand added into the sand hopper to promote to the sand storage hopper on the top of sand spraying machine. Because the wax mould model in the sand spraying process, the slurry that drops will be bonded with the sand material and form the sand tumor of large particle size, along with the use frequency of sand material increases, the sand tumor in the return material will be more and more. Therefore, when these sand tumors cannot be effectively and timely discharged by the vibration screen, it will cause the screen mesh hole to be blocked, cause the sand spraying machine to drop sand unevenly, seriously affect the sand hanging effect on the surface of wax mould model, cause the uneven thickness of shell, even shell scrap.

[0003] The thread of the sand material of the vertical sand spraying machine vibration system commonly used in the market is shorter at present, which causes the filtering efficiency of the screen hole to be lower. The screen frame is usually solid, which cannot play a filtering effect, causing the overall utilization rate of the vibration screen to be low. Moreover, the poor separation effect of the sand tumor causes the screen hole to be easily blocked. Since the vibration screen is located in the middle of the upper sand storage hopper, the sand storage hopper needs to be emptied before cleaning, so the cleaning difficulty of the vibration screen is extremely great and the frequency is high. In addition, the existing vibration screen usually increases the vibration gear position in order to excessively improve the vibration effect. Since the excessive excitation force causes the vibration effect to be transmitted to the sand spraying machine shell, the parts connected by threads are loose, which causes the vibration noise to be large, and even causes the structure of the sand spraying machine to be damaged. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem that the present vibration screen has low utilization rate, poor screening effect, screen hole is easily blocked, and short service life.

[0005] The technical scheme for solving the above technical problem of the utility model is as follows: a vertical sand spraying machine vibration screen, comprising: a screen frame, a screen plate, a drainage baffle, a vibrator, and a flow guide pipe, the bottom of the screen frame is provided with the screen plate, screen holes are uniformly arranged on the screen frame and the screen plate respectively, and the vibrator is arranged on the outer wall of one side of the screen frame;

[0006] The overall structure connected by the screen frame and the screen plate is arranged obliquely, the inside of the overall structure connected by the screen frame and the screen plate is provided with the drainage baffle, the screen plates on the two sides of the drainage baffle are respectively provided with a feeding position and the flow guide pipe, and an opening is arranged on the side, away from the feeding position, of the drainage baffle.

[0007] The utility model discloses the beneficial effect is: the whole structure design of this vibrating screen is simple, and the effective separation of sand grain and sand tumor is realized with very low cost, the plugging frequency of screen plate is reduced obviously, the effect of sound attenuation is improved greatly, the failure rate of sand shower machine is reduced, and the uniformity in the sand shower process is realized.

[0008] On the basis of the above technical scheme, the utility model can also be improved as follows.

[0009] Further, the bottom of the screen plate is connected with a support frame through a spring.

[0010] The beneficial effect of the above further scheme is that the support frame and the screen plate are connected through a spring, which can reduce the impact force of the vibrator on the whole vibrating screen system when working, prolong the service life of the vibrating screen, and at the same time, can attenuate noise and slow down the transmission of noise from the vibrating screen to the whole sand shower machine shell.

[0011] Further, the support frame adopts a triangular prism structure, and the end face of the support frame in contact with the screen plate is a trapezoid.

[0012] The longitudinal section of the support frame is a right triangle, and the included angle of the right triangle is adapted to the properties and size of the screened material.

[0013] The beneficial effect of the above further scheme is that the adjustment of the included angle of the right triangle can realize the adjustment of the inclination angle of the screen plate, and through the accurate adjustment of the inclination angle of the screen plate, the screened material can be more uniformly distributed and flowed on the screen plate, thereby improving the screening efficiency and being more applicable.

[0014] Further, the drainage baffle is provided with the screen holes of the same size as the screen frame and the screen plate.

[0015] The beneficial effect of the above further scheme is that the sand grains of normal particle size can pass through the pore size to the greatest extent.

[0016] Further, the feeding position is arranged at the corner end of the side of the screen plate with a relatively high relative position, the flow guide pipe is arranged at the corner end of the side of the screen plate with a relatively low relative position, the flow guide pipe is communicated with the bottom of the screen plate, and the feeding position and the flow guide pipe are arranged close to the same end face of the screen frame.

[0017] The beneficial effect of the above further scheme is that the feeding position is arranged at the corner end of the side of the screen plate with a relatively high relative position, and the flow guide pipe is arranged at the corner end of the side of the screen plate with a relatively low relative position and is communicated with the bottom of the screen plate, the sand tumor formed in the screening process can be effectively guided into the flow guide pipe by the arrangement of the slope surface of the screen plate and the drainage baffle, the plugging of the screen plate is effectively reduced, the screening efficiency is improved, and the sand gravel normally passing through the screen plate is further ensured not to be misarranged into the flow guide pipe.

[0018] Further, the drainage partition plate is arranged vertically to the screen plate, and two ends of the drainage partition plate in the length direction extend to abut against the inner end face arranged opposite to the screen frame.

[0019] The beneficial effect of the above further scheme is that by inserting a drainage partition plate in the middle of the screen plate, the rolling thread of normal sand on the screen plate can be longer, so that even if the sand falling amount is large, normal sand particles can still pass through the holes smoothly, and will not be directly discharged from the flow guide pipe.

[0020] Further, the drainage partition plate is arranged obliquely from one side to the other side in the length direction, and the opening is arranged on the side of the drainage partition plate with a relatively low position.

[0021] The beneficial effect of the above further scheme is that by hollowing out the end of the drainage partition plate, sand lumps with large particle sizes can pass through smoothly and finally slide into the flow guide pipe, thereby fully improving the utilization rate and working efficiency of the screen plate.

[0022] Further, the drainage partition plate is connected with the screen frame and the screen plate through fasteners.

[0023] The beneficial effect of the above further scheme is that by adopting a detachable connection mode, the drainage partition plate can be conveniently disassembled and replaced, thereby reducing the maintenance cost and time.

[0024] Further, the vibrator comprises an electric motor and an eccentric block, the electric motor is connected with the eccentric block through a shaft coupling, and the electric motor is arranged on the outer end face of the screen frame.

[0025] The beneficial effect of the above further scheme is that the high-frequency vibration generated by the high-frequency electric motor makes the sand lumps on the screen plate not easy to be retained to cause the screen hole to be blocked; the eccentric block can generate stronger centrifugal force, so that the whole vibrating screen system has stronger vibration intensity, thereby ensuring that the sand screening efficiency is higher.

[0026] Further, the surface of the vibrating screen is sprayed with a polyurethane elastomer coating or a tungsten carbide coating.

[0027] The beneficial effect of the above further scheme is that by spraying the coating, the wear resistance and impact resistance of the vibrating screen are increased, the corrosion resistance is enhanced, and the service life of the vibrating screen is improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a whole structure schematic view of an embodiment of the utility model.

[0029] In the drawings, the component list represented by each reference numeral is as follows:

[0030] 1. Support frame; 2. Screen frame; 3. Screen plate; 4. Drainage baffle; 5. Vibrator; 6. Spring; 7. Guide pipe; 8. Opening. Detailed Implementation

[0031] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0032] like Figure 1 As shown, this utility model provides a vibrating screen for a vertical sand washing machine, including: a screen frame 2, a screen plate 3, a flow guide baffle 4, a vibrator 5, and a guide pipe 7. The screen frame 2 forms a frame structure, and the screen plate 3 is provided at the bottom of the screen frame 2. Screen holes are evenly opened on both the screen frame 2 and the screen plate 3. A vibrator 5 is installed on the outer wall of either side of the screen frame 2. The vibration of the vibrator 5 ensures higher screening efficiency for sand. At the same time, a flow guide baffle 4 is provided inside the integral structure formed by the screen frame 2 and the screen plate 3, thereby dividing the area enclosed by the screen frame 2 and the screen plate 3 into two areas. The integral structure formed by the screen frame 2 and the screen plate 3 is inclined, so that the screen plate 3 can form a slope. A feed position and a guide pipe 7 are respectively provided on the screen plate 3 located on both sides of the flow guide baffle 4. In order to connect the two areas divided by the flow guide baffle 4, an opening 8 is provided on the side of the flow guide plate away from the feed position.

[0033] Because the sand in the vertical sand washing machine is recycled, the returned material used in the sand washing machine, along with the new sand added to the sand hopper, is lifted to the sand storage hopper at the top of the sand washing machine. The returned material contains excess sand lumps (formed by the slurry dripping from the wax model and adhering to the sand during the sand washing process). Therefore, when these mixed sand particles fall onto the surface of the screen plate 3, under the strong excitation force generated by the vibrator 5, the normal sand will fall directly through the screen holes onto the sand leveling device in the sand storage hopper of the sand washing machine, while the agglomerated sand lumps will be gradually guided along the screen frame 2, screen plate 3, and guide baffle 4 to be discharged into the guide pipe 7.

[0034] This vibrating screen is a vertical sand-spraying machine used in the field of investment casting and coating shell making. Specifically, it is installed above the sand leveling device in the sand storage hopper of the vertical sand-spraying machine, and is used for the first vibration to even out sand and separate sand nodules before sand spraying. The overall structure of this vibrating screen is simple, achieving effective separation of sand particles and nodules at extremely low cost, significantly reducing the frequency of clogging of the screen plate 3, greatly improving noise reduction, lowering the failure rate of the sand-spraying machine, and achieving uniformity during the sand spraying process.

[0035] like Figure 1As shown, in the preferred scheme, in order to realize the support of the screen frame 2 and the screen plate 3, a support frame 1 is further arranged at the bottom of the screen plate 3. In the embodiment, the cross section of the whole formed by the screen frame 2 and the screen plate 3 is a right-angled trapezoid, i.e. the shape of the screen plate 3 is also a right-angled trapezoid, and a spring 6 is arranged at each of the four corners of the bottom of the screen plate 3, so that the support frame 1 and the screen plate 3 are connected through the spring 6, which can reduce the impact force of the vibrator 5 on the whole vibrating screen system during the operation of the vibrator 5, prolong the service life of the vibrating screen, and at the same time, can reduce the noise and slow down the transmission of the noise from the vibrating screen to the whole sand spraying machine shell.

[0036] In order to realize the inclined arrangement of the screen frame 2 and the screen plate 3, the support frame 1 is arranged in a triangular prism structure, wherein the longitudinal section of the support frame 1 is a right-angled triangle, and the end surface of the support frame 1 in contact with the screen plate 3 is a trapezoid, which matches the shape of the screen plate 3; when initially designing and manufacturing the support frame 1, the included angle of the right-angled triangle is adaptively adjusted according to the properties and size of the screening material, so as to adjust the inclination, wherein the included angle of the right-angled triangle refers to any acute angle of the right-angled triangle, and the inclination angle of the screen plate 3 is adjusted by adjusting the size of the acute angle of the right-angled triangle, and by accurately adjusting the inclination angle of the screen plate 3, the screening material can be more uniformly distributed and flowed on the screen plate 3, so as to improve the screening efficiency and applicability.

[0037] In the embodiment, the flow guide partition plate 4 is also provided with screen holes, and the size of the screen holes on the flow guide partition plate 4 is the same as the aperture of the screen holes arranged on the screen frame 2 and the screen plate 3, so as to ensure that the sand particles with normal particle size can pass through the aperture to the maximum extent.

[0038] In some preferred embodiments, the feeding position is arranged at the corner end of the side of the screen plate 3 with relatively high relative position, the flow guide pipe 7 is arranged at the corner end of the side of the screen plate 3 with relatively low relative position, and the flow guide pipe 7 is in communication with the bottom of the screen plate 3, so that the sand lumps are guided into the flow guide pipe 7 by the slope surfaces of the screen frame 2 and the screen plate 3 and the flow guide partition plate 4 for discharge. In the embodiment, the feeding position and the flow guide pipe 7 are arranged close to the same end surface of the screen frame 2, so as to prevent the normal sand and gravel from being discharged from the flow guide pipe 7.

[0039] In the embodiment, the feeding position is arranged at the corner end of the side of the screen plate 3 with relatively high relative position, and the flow guide pipe 7 is arranged at the corner end of the side of the screen plate 3 with relatively low relative position and is in communication with the bottom of the screen plate 3, so that the sand lumps formed during the screening process can be effectively guided into the flow guide pipe 7 by the slope surfaces of the screen plate 3 and the arrangement of the flow guide partition plate 4, which effectively reduces the blockage of the screen plate 3, improves the screening efficiency, and further ensures that the sand and gravel normally passing through the screen plate 3 will not be mistakenly discharged into the flow guide pipe 7.

[0040] As shown in the drawings, Figure 1As shown, in the preferred scheme, the drainage baffle 4 is arranged vertically to the screen plate 3, and the two ends of the drainage baffle 4 in the length direction extend to the end face opposite to the screen frame 2, that is, in this embodiment, one end of the drainage baffle 4 in the length direction is connected to the end face of the screen frame 2 close to the flow guide pipe 7 and the feeding position, and the other end is connected to the other end face of the screen frame 2 arranged oppositely. By inserting the drainage baffle 4 in the middle of the screen plate 3, the rolling thread of the normal sand on the screen plate 3 can be longer, so that even if the sand quantity is large, the normal sand particles can still pass through the holes smoothly, and will not be directly discharged from the flow guide pipe 7.

[0041] As shown in the drawings, Figure 1 As shown in the further scheme, the drainage baffle 4 is arranged obliquely from one side to the other side in the length direction, and the opening 8 is arranged on the side of the drainage baffle 4 with a relatively low position. By hollowing out the end of the drainage baffle 4, the sand lump with a large particle size can pass through smoothly and finally slide into the flow guide pipe 7, thereby fully improving the utilization rate and working efficiency of the screen plate 3.

[0042] In some feasible embodiments, the drainage baffle 4 can be connected to the screen frame 2 and the screen plate 3 through fasteners, for example, a detachable bolt connection mode. By using the detachable connection mode, the drainage baffle 4 can be conveniently disassembled and replaced, thereby reducing the maintenance cost and time. It can be conceived that the length, installation angle of the drainage baffle 4 and the size of the hole diameter on the drainage baffle 4 are adaptively adjusted according to the actual size of the sand lump, so as to quickly separate the sand lump, and also improve the universality and applicability of the vibrating screen.

[0043] In the preferred scheme, the vibrator 5 includes an electric motor and an eccentric block. The electric motor can be a high-frequency motor, wherein the high-frequency motor is connected to the eccentric block through a shaft coupling. The high-frequency motor generates high-frequency vibration, so that the sand lump on the screen plate 3 is not easy to be retained, thereby preventing the screen hole from being blocked. The addition of the eccentric block can generate stronger centrifugal force, so that the entire vibrating screen system has stronger vibration intensity, thereby ensuring that the sand screening efficiency is higher. In the specific installation, the electric motor is installed on the outer end face of the screen frame 2.

[0044] In the preferred scheme, the surface of the entire vibrating screen is sprayed with a polyurethane elastomer or tungsten carbide coating, so as to increase the wear resistance and impact resistance of the vibrating screen, enhance the corrosion resistance, and thereby improve the service life of the vibrating screen.

[0045] In the specific working process, when the mixed sand particles fall to the far end position of the surface of the screen plate 3, under the action of the strong exciting force generated by the vibrator 5, the normal sand particles will directly fall through the holes of the screen plate 3 or the screen frame 2 to the sand quantity leveling device of the sand storage hopper of the sand shower machine, and the sand lump formed into a block will gradually pass through the opening 8 of the drainage baffle 4 along the slope surface of the screen frame 2, the screen plate 3 and the drainage baffle 4, and finally be guided into the flow guide pipe 7 for discharge.

[0046] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model.

Claims

1. A vibrating screen for a vertical sand washing machine, characterized in that, include: The sieve frame (2), sieve plate (3), flow guide baffle (4), vibrator (5) and flow guide pipe (7) are provided. The sieve plate (3) is provided at the bottom of the sieve frame (2). The sieve frame (2) and the sieve plate (3) are provided with sieve holes evenly. The vibrator (5) is provided on one side of the outer wall of the sieve frame (2). The overall structure formed by connecting the screen frame (2) and the screen plate (3) is inclined. The internal part of the overall structure formed by connecting the screen frame (2) and the screen plate (3) is provided with the flow guide plate (4). The screen plate (3) located on both sides of the flow guide plate (4) is provided with the feed position and the guide pipe (7) respectively. The flow guide plate (4) has an opening (8) on the side away from the feed position.

2. The vibrating screen for a vertical sand washing machine according to claim 1, characterized in that, The bottom of the sieve plate (3) is connected to a support frame (1) by a spring (6).

3. The vibrating screen for a vertical sand washing machine according to claim 2, characterized in that, The support frame (1) adopts a triangular prism structure, and the end face of the support frame (1) that contacts the sieve plate (3) is trapezoidal; The longitudinal section of the support frame (1) is a right triangle, and the included angle of the right triangle is adapted to the properties and size of the screened material.

4. The vibrating screen for a vertical sand washing machine according to claim 1, characterized in that, The flow guide baffle (4) has sieve holes of the same size as those on the sieve frame (2) and the sieve plate (3).

5. The vibrating screen for a vertical sand washing machine according to claim 1, characterized in that, The feed position is located at the corner of the screen plate (3) on the side with a relatively higher position, and the guide pipe (7) is located at the corner of the screen plate (3) on the side with a relatively lower position. The guide pipe (7) is connected to the bottom of the screen plate (3). The feed position and the guide pipe (7) are located on the same end face near the screen frame (2).

6. The vibrating screen for a vertical sand washing machine according to claim 1, characterized in that, The flow guide baffle (4) is arranged perpendicular to the sieve plate (3), and the two ends of the flow guide baffle (4) extend in the length direction to abut against the inner end face of the sieve frame (2).

7. The vibrating screen for a vertical sand washing machine according to claim 1, characterized in that, The drainage baffle (4) is inclined from one side to the other along its length, and the opening (8) is opened on the side of the drainage baffle (4) which is relatively lower.

8. The vibrating screen for a vertical sand washing machine according to claim 1, characterized in that, The flow guide baffle (4) is connected to the sieve frame (2) and the sieve plate (3) by fasteners.

9. A vibrating screen for a vertical sand washing machine according to claim 1, characterized in that, The vibrator (5) includes a motor and an eccentric block. The motor is connected to the eccentric block via a coupling. The motor is located on the outer end face of the screen frame (2).

10. A vibrating screen for a vertical sand-washing machine according to any one of claims 1-9, characterized in that, The surface of the vibrating screen is coated with a polyurethane elastomer coating or a tungsten carbide coating.

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