Screening machine for precoated sand coating production

Abstract

The invention provides a precoated sand coating production screening machine, belongs to the technical field of precoated sand production, and solves the technical problems that an existing screening machine is tedious in screen replacement, high in energy consumption, poor in screening effect and the like. Comprising a rack, an up-down vibration mechanism, a screen mechanism and a screen box mechanism, the screen box mechanism is hinged to the lower portion of the inner side of the rack, a transmission mechanism, a first driving motor and a high-pressure fan are arranged on the upper end face of the rack, an eccentric vibration mechanism is arranged on the side portion of the rack, and a plurality of reset springs are arranged between the left side and the right side of the screen box mechanism and the rack; a turning plate mechanism is arranged on the rear side of the screen box mechanism, a plurality of blower guns are arranged on the inner top of the screen box mechanism, a scattering roller is arranged on the rear side of the interior of the screen box mechanism, and a plurality of scraper mechanisms are arranged on the screen mechanism. The vibrating screen can vibrate up and down, is low in energy consumption, good in vibration effect and capable of vibrating left and right, enables raw materials to be dispersed, is high in screening efficiency, long in screening path, stable in screening quality, convenient to install and capable of being automatically cleaned, and ensures that the working environment is clean.

Description

Technical Field

[0001] The invention belongs to the technical field of coated sand production and relates to a screening machine, in particular to a screening machine for coating production of coated sand. Background Art

[0002] Screening machines are equipment for grading and separating materials. In the production process of coated sand coating, it is necessary to use a screening machine to screen out coatings that do not meet the specifications and obtain coatings that meet the specifications for subsequent use. Vibrating screen is a commonly used screening machine. When replacing the screen, both ends of the existing vibrating screen are connected to the main body of the screening machine. If you want to disassemble the screen, you need to disassemble both ends of the screen separately, and install a new screen. The operation steps are cumbersome, which affects the efficient screening of the coated sand coating. At the same time, the existing vibrating screen completes the screening effect through overall vibration, which has high energy consumption and poor screening effect.

[0003] Therefore, we propose a screening machine for coated sand coating production, which can vibrate up and down, has low energy consumption, good vibration effect, can vibrate left and right to disperse the raw materials, has high screening efficiency, long screening path, stable screening quality, easy screen installation, and can be automatically cleaned to ensure a clean working environment. Summary of the invention

[0004] The purpose of the present invention is to address the above-mentioned problems in the existing technology and propose a screening machine for the production of coated sand coatings. The technical problem to be solved by the invention is: how to achieve low-consumption, high-efficiency and environmentally friendly screening of coated sand raw materials, ensure the screening quality, and realize convenient replacement of the screen.

[0005] The purpose of the present invention can be achieved by the following technical solutions: A screening machine for producing coated sand coatings comprises a frame, an upper and lower vibration mechanism, a screen mechanism and a screen box mechanism, wherein the screen box mechanism is hinged at the inner lower side of the frame, and the screen box mechanism is tilted, the screen mechanism is arranged in the screen box mechanism, the upper and lower vibration mechanism is arranged on the screen mechanism, the upper end surface of the frame is provided with a transmission mechanism, a drive motor 1 and a high-pressure fan, the output shaft end of the drive motor 1 is transmission-connected to the blade rotating shaft of the high-pressure fan, the output shaft of the drive motor 1 is transmission-connected to the transmission mechanism, the transmission mechanism is transmission-connected to the upper and lower vibration mechanisms, the side of the frame is provided with an eccentric vibration mechanism, and the eccentric The vibration mechanism is transmission connected to the screen box mechanism, a number of return springs are arranged between the left and right sides of the screen box mechanism and the frame, a flap mechanism is arranged on the rear side of the screen box mechanism, a number of air guns are arranged on the inner top of the screen box mechanism, the several air guns are connected to the external multi-way valve by pipes, the external multi-way valve is connected to the air outlet of the high-pressure fan by pipes, the air inlet of the high-pressure fan is connected to the external filter box by pipes, the external filter box and the screen box mechanism are connected by pipes, a breaking roller is arranged on the inner rear side of the screen box mechanism, the breaking roller is located above the screen mechanism, and a number of scraper mechanisms are arranged on the screen mechanism.

[0006] The working principle of the present invention is as follows: the flap mechanism moves to open the rear side of the screen box mechanism, and the staff installs a screen mechanism of appropriate specifications from the rear side of the screen box mechanism according to the specifications of the coated sand coating required, and starts the screening machine. The eccentric vibration mechanism moves to drive the screen box mechanism and the screen mechanism to move. When vibrating left and right, a number of reset springs on both sides keep the screen box mechanism vibrating left and right, and the output shaft of the driving motor drives the transmission mechanism and the high-pressure fan to rotate, and the transmission mechanism drives the upper and lower vibration mechanism to move, and the upper and lower vibration mechanism drives the screen mechanism to vibrate up and down, and at the same time, the transmission mechanism drives the scattering roller to move; Then the staff will continue to put the coated sand raw materials into the screen box mechanism. After being scattered by the scattering roller, the screen mechanism will screen the coated sand raw materials and screen out coated sand coatings of different specifications. The coated sand coatings of different specifications are collected by the screen box mechanism to form coated sand coating products of different specifications. After the screening is completed, several scraper mechanisms will move to scrape off the coated sand raw materials engaged on the screen mechanism to keep the equipment clean. The inclined screen mechanism will vibrate up and down and left and right, so that the movement track of the coated sand raw materials on the screen mechanism will be longer, the coated sand raw materials will be more dispersed, and the screening effect will be better. During screening, smoke and dust are generated, which are sucked into the external filter box, filtered by the external filter box and then discharged through the high-pressure fan. During cleaning, the sucked air is transported to the external multi-way valve through the high-pressure fan, and then transported to several air guns through the external multi-way valve. The screen box mechanism and the screen mesh mechanism are cleaned by the several air guns, and the generated dust is sucked into the external filter box, filtered by the external filter box and then transported to the external multi-way valve through the high-pressure fan, and then sprayed out again through several air guns to form an air circulation.

[0007] The four corners of the lower top of the frame are provided with hanging hinge seats, and the four hanging hinge seats are symmetrically arranged in pairs. The upper end of the frame is provided with a fixing plate three, and a driving motor one and a high-pressure fan are arranged on the fixing plate three. The left and right sides of the frame are provided with fixing plates four.

[0008] With the above structure, the hanging hinge seat is used for hinged installation of the screen box mechanism, and the fixing plate four is convenient for installing and fixing the eccentric vibration mechanism.

[0009] The screen box mechanism comprises a screen box body, wherein two left-right symmetrically arranged suspension connecting rods are arranged on the front side of the upper end of the screen box body, and the two suspension connecting rods are respectively hinged to the suspension hinge seats at corresponding positions; two left-right symmetrically arranged suspension connecting rods are arranged on the rear side of the upper end of the screen box body, and the two suspension connecting rods are respectively hinged to the suspension hinge seats at corresponding positions; a plurality of symmetrically arranged equidistantly distributed fixed spring assemblies are arranged on the left and right sides of the inside of the screen box body, and the plurality of fixed spring assemblies are all close to the bottom of the screen box body; a plurality of fixed spring assemblies are arranged on the rear side of the inside of the screen box body; A number of vertically evenly distributed baffle plates are provided, and the baffle plates are all located above the scraper mechanisms at corresponding positions. Fixed rods are provided on the left and right sides of the screen box body. A feed hopper is provided on the rear side of the upper end of the screen box body, and a collecting hopper is provided on the front side of the screen box body. A number of collecting cavities are provided inside the collecting hopper. A collecting plate is provided on the rear side of the collecting cavities, and the collecting plates extend into the screen box body. A discharge hopper is provided on the front side of the collecting cavities, and the discharge ports of the discharge hoppers are alternately distributed. A number of dust suction ports are provided on the upper end of the screen box body, and the dust suction ports are connected to the external filter box through pipes.

[0010] With the above structure, the baffle plate is used to block the material to prevent the raw materials from spilling out, the fixing rod is convenient for installing the fixed flap mechanism, the collecting plate is used to guide the screened coated sand coating into the collecting cavity at the corresponding position, the coated sand coating in the collecting cavity enters the discharge hopper at the corresponding position, and is collected through the discharge port at the corresponding position. At the same time, the screened coated sand coating enters other collecting cavities through the gaps, and the dust suction port is used to suck dust.

[0011] The fixed spring assembly includes a mounting plate 1 and a mounting plate 2. The mounting plate 1 is fixed on the left and right end surfaces inside the screen box body. The mounting plate 1 is close to the inner bottom of the screen box body. The mounting plate 2 is arranged below the screen mechanism. A fixed spring is arranged between the mounting plate 1 and the mounting plate 2.

[0012] With the above structure, the fixing spring is used for the vibrating screen.

[0013] The screen mechanism comprises a plurality of vertically equidistant supporting plates, the lowest supporting plate being arranged on a plurality of mounting plates, two groups of symmetrically arranged connecting spring assemblies being arranged between two adjacent supporting plates, the connecting spring assemblies of each group being equidistantly arranged, and the connecting spring assemblies being close to the side of the supporting plate, the front end of the supporting plate being located above the collecting plate at the corresponding position, the inner upper end of the supporting plate being provided with a sliding groove symmetrically arranged and a mounting groove symmetrically arranged, the mounting grooves being located below the sliding grooves at the corresponding positions, the two symmetrically arranged mounting grooves being detachably provided with screens, the rear end faces of the supporting plates being provided with locking assemblies symmetrically arranged, and the locking assemblies The buckle assembly includes a fixing plate 1, a locking screw and a fixing plate 2. The fixing plate 1 and the fixing plate 2 are both fixed on the rear end surface of the supporting plate. The fixing plate 1 and the fixing plate 2 are respectively located on the upper and lower sides of the mounting groove. A buckle plate is rotatably provided on the fixing plate 1. A clamping block is provided on the fixing plate 2. The buckle plate is clamped on the clamping block. The locking screws pass through the buckle plate and are screwed on the fixing plate 2. The connecting spring assembly includes an upper top plate, a lower top plate and a connecting plate which are arranged in sequence from top to bottom. The upper top plates are arranged on the lower end surface of the supporting plate at the corresponding position. The lower top plates are arranged on the upper end surface of the supporting plate at the corresponding position. Two connecting springs are arranged between the upper top plate and the connecting plate and between the lower top plate and the connecting plate.

[0014] With the above structure, the supporting plate is used to support the screen. During screening, the coated sand raw material is screened from the topmost screen downwards again and again to form different types of coated sand coatings. During screening, the screen is tilted to extend the screening path and enhance the screening effect. The screen is fixed in the installation groove through the cooperation of the fixing plate one, the tightening screw, the fixing plate two and the buckle plate to facilitate installation, disassembly and replacement. The connecting spring is used to transmit the vibration between the supporting plates to make the screen on the supporting plate vibrate.

[0015] The transmission mechanism includes a transmission shaft 1 and four bearing seats, the axes of the four bearing seats are collinear, two of the bearing seats are fixed on the left and right sides of the upper end of the frame, and the other two bearing seats are fixed on the left and right sides of the upper end of the fixed plate 3. The transmission shaft 1 is fixed inside the inner rings of the four bearing seats, and the transmission shaft 1 is connected to the output shaft of the drive motor 1 through a pulley pair.

[0016] With the above structure, the output shaft of the driving motor drives the transmission shaft to rotate on the four bearing seats, and the transmission shaft drives the breaking roller and the upper and lower vibration mechanisms to move.

[0017] The scraper mechanism includes a scraper and two electric screw members symmetrically arranged on the left and right. The two electric screw members are respectively arranged on the left and right sides of the upper end of a supporting plate at corresponding positions. The scraper is fixed on the screw sliders of the two electric screw members. The lower end surface of the scraper contacts the upper end surface of the screen at the corresponding position. Sliding blocks are provided on the left and right sides of the scraper. The two sliding blocks are respectively slidably arranged in the sliding grooves at the corresponding positions.

[0018] With the above structure, after screening is completed, the vibration is maintained, and the two electric screw parts move synchronously. The screw sliders of the two electric screw parts drive the two sliding blocks to slide in the sliding grooves at corresponding positions, so that the scraper scrapes the surface of the screen, pushing the coated sand particles engaged in the sieve holes of the screen and the coated sand raw materials remaining on the surface of the screen. When the scraper is pushed, it stops moving after encountering a certain resistance, and the loosened coated sand particles leave the sieve holes as the screen vibrates, and then the scraper continues to move to push the coated sand particles and the remaining coated sand raw materials into the aggregate cavity to avoid residue.

[0019] The scattering roller is rotatably arranged in the screen box body and extends out of the screen box body. The scattering roller is located below the feed hopper and the front side of the uppermost material baffle plate in the screen box body. The two ends of the scattering roller are connected to the transmission shaft through a pulley pair. The scattering roller is detachably provided with a plurality of paddles evenly distributed around the circumference.

[0020] With the above structure, the movement of the scattering roller drives the several blades thereon to rotate. During screening, the coated sand raw materials fall on the rotating scattering roller and are beaten by the several blades on the scattering roller to disperse the coated sand raw materials, thereby achieving a better screening effect.

[0021] The flap mechanism includes two electric push rods and a flap, the flap is hinged on the rear side of the screen box body, one end of the two electric push rods is hinged on the rear end surface of the flap, and the other ends of the two electric push rods are hinged on the fixed rods on both sides of the screen box body.

[0022] With the above structure, the telescopic ends of the two electric push rods extend to drive the flap to move, so that the flap no longer contacts the screen box body, which is convenient for installing and replacing the screen. During screening, the telescopic ends of the two electric push rods are retracted to drive the flap to move, so that the flap contacts the screen box body, which is used to prevent dust and maintain the working environment.

[0023] The eccentric vibration mechanism includes a second driving motor, a vibrator housing and a vibration shaft. The vibrator housing is fixed on a fourth fixing plate. A guide sleeve is provided on the vibrator housing. The vibration shaft is slidably arranged in the guide sleeve. The end of the vibration shaft is fixed on the screen box body. A flywheel is rotatably arranged in the vibrator housing. A connecting rod is hinged between the flywheel and the vibration shaft. The end of the vibration shaft is fixed on the fixing rod. The output shaft of the second driving motor is fixedly connected to the flywheel.

[0024] With the above structure, the output shaft of the second driving motor drives the flywheel to rotate, the flywheel drives the connecting rod to move, the connecting rod drives the vibration shaft to slide in the guide sleeve, and the movement of the vibration shaft drives the screen box body to vibrate.

[0025] The upper and lower vibration mechanism includes a vibration seat, a second transmission shaft and a rotating wheel. The vibration seat is detachably arranged on the side of a supporting plate located in the middle position of the screen mechanism. The rotating wheel is located in the vibration seat. The second transmission shaft is rotatably arranged on a fixed plate four, and the second transmission shaft is transmission-connected with the first transmission shaft. The second transmission shaft extends into the body of the screen box. An avoidance hole is opened inside the vibration seat. The vibration seat is provided with symmetrically arranged bar teeth. A fixed shaft is provided on the rotating wheel. The second transmission shaft is transmission-connected with the fixed shaft. The fixed shaft is slidably arranged in the avoidance hole. The rotating wheel is provided with arc teeth, and two bar teeth are intermittently meshed with the arc teeth.

[0026] With the above structure, the output shaft of the driving motor 1 drives the transmission shaft 1 to rotate, the transmission shaft 1 drives the transmission shaft 2 to rotate, the transmission shaft 2 drives the rotating wheel and the arc-shaped teeth to rotate, and the arc-shaped teeth intermittently mesh with the two bar teeth during movement. During meshing, the reaction causes the vibration seat to move up and down, and the fixed shaft of the rotating wheel slides in the avoidance hole.

[0027] Compared with the existing technology, this coated sand coating production screening machine has the following advantages: 1. The screen box mechanism is coordinated with the frame to make the screen box mechanism tilted, which is convenient for screening and collection of finished products.

[0028] 2. The flap is folded up by the flap mechanism, and it contacts the screen box body to prevent dust and ensure a clean production environment. When the flap is opened, it does not contact the screen box body, which is convenient for screen installation.

[0029] 3. The coated sand raw materials are broken up by the cooperation of the breaking roller and the paddle to improve the screening effect, and cooperate with the baffle plate to prevent the scattered raw materials from splashing out and ensure the screening environment.

[0030] 4. Fix the screen by the locking assembly to ensure that the screen works stably during screening, and cooperate with the supporting plate to facilitate the installation and replacement of the screen.

[0031] 5. Through the screen mechanism, transmission mechanism, drive motor and up and down vibration mechanism, the screen mechanism can vibrate up and down, with low energy consumption and good vibration effect. It cooperates with the screen box mechanism and eccentric vibration mechanism to drive the screen mechanism to vibrate left and right, so that the coated sand raw materials are dispersed, the screening efficiency is improved, the screening path is extended, and the screening quality is ensured.

[0032] 6. Through the cooperation of high-pressure fan with external multi-way valve, dust suction port, several air guns and external filter box, dust is sucked out to form wind circulation, clean the interior and keep the environment clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the rear three-dimensional structure of the present invention.

[0034] Figure 2 It is a schematic diagram of the front three-dimensional structure of the present invention.

[0035] Figure 3 It is a three-dimensional structural schematic diagram of some components in the present invention.

[0036] Figure 4 It is a partial cross-sectional structural schematic diagram of some components in the present invention.

[0037] Figure 5 It is a three-dimensional structural schematic diagram of the screen mechanism and the upper and lower vibration mechanism in the present invention.

[0038] Figure 6 It is a schematic diagram of the three-dimensional structure of the supporting plate in the present invention.

[0039] Figure 7 yes Figure 6 A partial enlarged view of point A in the middle.

[0040] Figure 8 It is a structural schematic diagram of the beating roller in the present invention.

[0041] Fig. 9 It is a structural schematic diagram of the eccentric vibration mechanism in the present invention.

[0042] Fig.10 It is a structural schematic diagram of the lock assembly in the present invention.

[0043] Fig.11 It is a three-dimensional structural schematic diagram of the fixed spring assembly in the present invention.

[0044] Fig.12 It is a three-dimensional structural schematic diagram of the connecting spring assembly in the present invention.

[0045] Fig.13 It is a schematic diagram of the disconnection structure of the scraper mechanism in the present invention.

[0046] Fig.14 It is a three-dimensional structural schematic diagram of the upper and lower vibration mechanism in the present invention.

[0047] In the figure, 1, frame; 2, transmission mechanism; 3, driving motor 1; 4, high-pressure fan; 5, up and down vibration mechanism; 6, eccentric vibration mechanism; 7, scattering roller; 8, electric push rod; 9, flap; 10, screen box mechanism; 11, collecting hopper; 12, hanging hinge seat; 13, reset spring; 14, hanging connecting rod 1; 15, hanging connecting rod 2; 16, discharge hopper; 17, feed hopper; 18, screen box body; 19, dust suction port; 20, fixing rod; 21, scraper mechanism; 22, screen; 23, screen mechanism; 24, supporting plate; 25, arc teeth; 26, connection Spring assembly; 27, locking assembly; 28, sliding groove; 29, mounting groove; 30, paddle; 31, vibrator housing; 32, vibration shaft; 33, fixing plate one; 34, fixing plate two; 35, tightening screw; 36, buckle plate; 37, mounting plate one; 38, fixing spring; 39, mounting plate two; 40, upper top plate; 41, lower top plate; 42, connecting plate; 43, connecting spring; 44, electric screw rod; 45, sliding block; 46, scraper; 47, vibration seat; 48, rotating wheel; 49, bar teeth; 50, avoidance hole; 51, transmission shaft two; 52, baffle plate. DETAILED DESCRIPTION

[0048] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0049] like Figure 1-Figure 14 As shown, the present coated sand coating production screening machine comprises a frame 1, an upper and lower vibration mechanism 5, a screen mechanism 23 and a screen box mechanism 10, wherein the screen box mechanism 10 is hinged at the inner lower side of the frame 1, and the screen box mechanism 10 is tilted, the screen mechanism 23 is arranged in the screen box mechanism 10, the upper and lower vibration mechanism 5 is arranged on the screen mechanism 23, the upper end surface of the frame 1 is provided with a transmission mechanism 2, a drive motor 3 and a high-pressure fan 4, the output shaft end of the drive motor 3 is transmission-connected to the blade shaft of the high-pressure fan 4, the output shaft of the drive motor 3 is transmission-connected to the transmission mechanism 2, the transmission mechanism 2 is transmission-connected to the upper and lower vibration mechanism 5, and the side of the frame 1 is provided with an eccentric vibration mechanism 6. The eccentric vibration mechanism 6 is transmission-connected to the screen box mechanism 10, a plurality of return springs 13 are arranged between the left and right sides of the screen box mechanism 10 and the frame 1, a flap mechanism is arranged on the rear side of the screen box mechanism 10, a plurality of air guns are arranged on the inner top of the screen box mechanism 10, the plurality of air guns are connected to the external multi-way valve by a pipeline, the external multi-way valve is connected to the air outlet of the high-pressure fan 4 by a pipeline, the air inlet of the high-pressure fan 4 is connected to the external filter box by a pipeline, the external filter box and the screen box mechanism 10 are connected by a pipeline, a scattering roller 7 is arranged on the inner rear side of the screen box mechanism 10, the scattering roller 7 is located above the screen mechanism 23, and a plurality of scraper mechanisms 21 are arranged on the screen mechanism 23.

[0050] In this embodiment, the flap mechanism moves to open the rear side of the screen box mechanism 10. The staff installs a screen mechanism 23 of appropriate specifications from the rear side of the screen box mechanism 10 according to the specifications of the coated sand coating required, and starts the screening machine. The eccentric vibration mechanism 6 moves to drive the screen box mechanism 10 and the screen mechanism 23 to move. When vibrating left and right, a number of reset springs 13 on both sides keep the screen box mechanism 10 vibrating left and right. The output shaft of the driving motor 3 drives the transmission mechanism 2 and the high-pressure fan 4 to rotate, and the transmission mechanism 2 drives the up and down vibration mechanism 5 to move. The up and down vibration mechanism 5 drives the screen mechanism 23 to vibrate up and down. At the same time, the transmission mechanism 2 drives the scattering roller 7 to move; Subsequently, the staff continuously puts the coated sand raw materials into the screen box mechanism 10. After being scattered by the scattering roller 7, the screen mechanism 23 screens the coated sand raw materials to screen out coated sand coatings of different specifications. The coated sand coatings of different specifications are collected by the screen box mechanism 10 to form coated sand coating products of different specifications. After the screening is completed, a plurality of scraper mechanisms 21 move to scrape off the coated sand raw materials engaged on the screen mechanism 23 to keep the equipment clean. The inclined screen mechanism 23 vibrates up and down and left and right, so that the movement trajectory of the coated sand raw materials on the screen mechanism 23 is longer, the coated sand raw materials are more dispersed, and the screening effect is better. During screening, smoke and dust are generated, which are sucked into the external filter box, filtered by the external filter box and then discharged through the high-pressure fan 4. During cleaning, the sucked air is transported to the external multi-way valve through the high-pressure fan 4, and then transported to several air guns through the external multi-way valve. The screen box mechanism 10 and the screen mesh mechanism 23 are cleaned by the several air guns, and the generated dust is sucked into the external filter box, filtered by the external filter box and then transported to the external multi-way valve through the high-pressure fan 4, and then sprayed out again through several air guns to form a wind circulation.

[0051] The four corners of the top lower end of the frame 1 are each provided with a suspension hinge seat 12, and the four suspension hinge seats 12 are symmetrically arranged in pairs. The upper end of the frame 1 is provided with a fixing plate three, and a driving motor 1 3 and a high-pressure fan 4 are arranged on the fixing plate three. Fixed plates four are provided on both sides of the frame 1.

[0052] In this embodiment, the hanging hinge seat 12 is used to hinge the screen box mechanism 10, and the fixing plate 4 is convenient for installing and fixing the eccentric vibration mechanism 6.

[0053] The screen box mechanism 10 includes a screen box body 18, and the upper front side of the screen box body 18 is provided with two symmetrically arranged suspension connecting rods 14, and the two suspension connecting rods 14 are respectively hinged to the suspension hinge seats 12 at corresponding positions. The upper rear side of the screen box body 18 is provided with two symmetrically arranged suspension connecting rods 15, and the two suspension connecting rods 15 are respectively hinged to the suspension hinge seats 12 at corresponding positions. The left and right sides of the screen box body 18 are provided with a plurality of symmetrically arranged equidistant and uniformly distributed fixed spring assemblies, and the plurality of fixed spring assemblies are all close to the bottom of the screen box body 18. The rear side of the screen box body 18 is provided with a plurality of vertical spring assemblies. The baffle plates 52 are evenly distributed and are located above the scraper mechanisms 21 at corresponding positions. Fixed rods 20 are provided on the left and right sides of the screen box body 18. A feed hopper 17 is provided on the rear side of the upper end of the screen box body 18. A collecting hopper 11 is provided on the front side of the screen box body 18. A plurality of collecting cavities are provided inside the collecting hopper 11. A collecting plate is provided on the rear side of the collecting cavities, and the collecting plates extend into the screen box body 18. A discharge hopper 16 is provided on the front side of the collecting cavities. The discharge ports of the plurality of discharge hoppers 16 are alternately distributed. A plurality of dust suction ports 19 are provided on the upper end of the screen box body 18, and the plurality of dust suction ports 19 are connected to the external filter box through pipes.

[0054] In this embodiment, the baffle plate 52 is used to block the material to prevent the raw materials from spilling out. The fixed rod 20 facilitates the installation of a fixed flap mechanism. The collecting plate is used to guide the screened coated sand coating into the collecting cavity at the corresponding position. The coated sand coating in the collecting cavity enters the discharge hopper 16 at the corresponding position and is collected through the discharge port at the corresponding position. At the same time, the screened coated sand coating enters other collecting cavities through the gaps. The dust suction port 19 is used to suck dust.

[0055] The fixed spring assembly includes a mounting plate 1 37 and a mounting plate 2 39. The mounting plate 1 37 is fixed on the left and right end faces inside the screen box body 18. The mounting plate 1 37 is close to the inner bottom of the screen box body 18. The mounting plate 2 39 is arranged below the screen mechanism 23. A fixed spring 38 is arranged between the mounting plate 1 37 and the mounting plate 2 39.

[0056] In the present embodiment, a fixing spring 38 is used to vibrate the screen 22 .

[0057] The screen mechanism 23 includes a plurality of vertically equidistant supporting plates 24, the lowest supporting plates 24 are arranged on a plurality of mounting plates 39, two groups of symmetrically arranged connecting spring assemblies 26 are arranged between two adjacent supporting plates 24, the connecting spring assemblies 26 of each group are equidistantly arranged, and the connecting spring assemblies 26 are close to the side of the supporting plate 24, the front end of the supporting plate 24 is located above the collecting plate at the corresponding position, the inner upper end of the supporting plate 24 is provided with a sliding groove 28 and a symmetrically arranged mounting groove 29, the mounting groove 29 is located below the sliding groove 28 at the corresponding position, the two symmetrically arranged mounting grooves 29 are both detachably provided with the screen 22, the rear side end surface of the supporting plate 24 is provided with a locking assembly 27 symmetrically arranged, and the locking assembly 27 includes a fixing plate 39. 3. The fixing screw 35 and the fixing plate 34. The fixing plate 1 33 and the fixing plate 2 34 are both fixed on the rear end surface of the supporting plate 24. The fixing plate 1 33 and the fixing plate 2 34 are respectively located on the upper and lower sides of the mounting groove 29. A buckle plate 36 is rotatably provided on the fixing plate 1 33. The fixing plate 2 34 is provided with a snap block. The buckle plate 36 is snapped on the snap block. The fixing screw 35 passes through the buckle plate 36 and is screwed to the fixing plate 2 34. The connecting spring assembly 26 includes an upper top plate 40, a lower top plate 41 and a connecting plate 42 which are arranged in sequence from top to bottom. The upper top plates 40 are arranged on the lower end surface of the supporting plate 24 at the corresponding position, and the lower top plates 41 are arranged on the upper end surface of the supporting plate 24 at the corresponding position. Two connecting springs 43 are arranged between the upper top plate 40 and the connecting plate 42 and between the lower top plate 41 and the connecting plate 42.

[0058] In this embodiment, the supporting plate 24 is used to support the screen 22. During screening, the coated sand raw material is screened from the top screen 22 downwards again and again to form different types of coated sand coatings. During screening, the screen 22 is tilted to extend the screening path and enhance the screening effect. The screen 22 is fixed in the installation groove 29 through the cooperation of the fixing plate 1 33, the locking screw 35, the fixing plate 2 34 and the buckle plate 36, which is convenient for installation, disassembly and replacement. The connecting spring 43 is used to transmit the vibration between the supporting plates 24 to make the screen on the supporting plate 24 vibrate.

[0059] The transmission mechanism 2 includes a transmission shaft 1 and four bearing seats, the axes of the four bearing seats are collinear, two of the bearing seats are fixed on the left and right sides of the upper end of the frame 1, and the other two bearing seats are fixed on the left and right sides of the upper end of the fixed plate 3. The transmission shaft 1 is fixed inside the inner rings of the four bearing seats, and the transmission shaft 1 is connected to the output shaft of the drive motor 1 3 through a pulley pair.

[0060] In this embodiment, the output shaft of the driving motor 3 drives the transmission shaft 1 to rotate on four bearing seats, and the transmission shaft 1 drives the breaking roller 7 and the upper and lower vibration mechanism 5 to move.

[0061] The scraper mechanism 21 includes a scraper 46 and two electric screw members 44 symmetrically arranged on the left and right. The two electric screw members 44 are respectively arranged on the left and right sides of the upper end of the supporting plate 24 at corresponding positions. The scraper 46 is fixed on the screw sliders of the two electric screw members 44. The lower end surface of the scraper 46 contacts the upper end surface of the screen 22 at the corresponding position. Sliding blocks 45 are provided on the left and right sides of the scraper 46. The two sliding blocks 45 are respectively slidably arranged in the sliding grooves 28 at corresponding positions.

[0062] In this embodiment, after screening is completed, vibration is maintained, and the two electric screw members 44 move synchronously. The screw sliders of the two electric screw members 44 drive the two sliding blocks 45 to slide in the sliding grooves 28 at corresponding positions, so that the scraper 46 scrapes the surface of the screen 22, pushing the coated sand particles engaged in the sieve holes of the screen 22 and the coated sand raw materials remaining on the surface of the screen 22. When the scraper 46 is pushed, it stops moving after encountering a certain resistance, and the loosened coated sand particles leave the sieve holes as the screen 22 vibrates, and then the scraper 46 continues to move, pushing the coated sand particles and the remaining coated sand raw materials into the aggregate cavity to avoid residue.

[0063] The scattering roller 7 is rotatably arranged in the screen box body 18 and extends out of the screen box body 18. The scattering roller 7 is located below the feed hopper 17. The scattering roller 7 is located on the front side of the uppermost material baffle plate 52 in the screen box body 18. The two ends of the scattering roller 7 are connected to the transmission shaft through a pulley pair. The scattering roller 7 is detachably provided with a plurality of circumferentially evenly distributed paddle blades 30.

[0064] In this embodiment, the movement of the scattering roller 7 drives the plurality of blades 30 thereon to rotate. During screening, the coated sand raw material falls on the rotating scattering roller 7 and is beaten by the plurality of blades 30 on the scattering roller 7 to disperse the coated sand raw material, thereby achieving a better screening effect.

[0065] The flap mechanism includes two electric push rods 8 and a flap 9. The flap 9 is hinged on the rear side of the screen box body 18. One end of the two electric push rods 8 is respectively hinged on the rear end surface of the flap 9, and the other end of the two electric push rods 8 is respectively hinged on the fixed rods 20 on both sides of the screen box body 18.

[0066] In this embodiment, the telescopic ends of the two electric push rods 8 are extended to drive the flap 9 to move, so that the flap 9 no longer contacts the screen box body 18, which is convenient for installing and replacing the screen 22. During screening, the telescopic ends of the two electric push rods 8 are retracted to drive the flap 9 to move, so that the flap 9 contacts the screen box body 18, which is used to prevent dust and maintain the working environment.

[0067] The eccentric vibration mechanism 6 includes a driving motor 2, a vibrator housing 31 and a vibration shaft 32. The vibrator housing 31 is fixed on a fixed plate 4. A guide sleeve is provided on the vibrator housing 31. The vibration shaft 32 is slidably arranged in the guide sleeve. The end of the vibration shaft 32 is fixed on the screen box body 18. A flywheel is rotatably arranged in the vibrator housing 31. A connecting rod is hinged between the flywheel and the vibration shaft 32. The end of the vibration shaft 32 is fixed on the fixed rod 20. The output shaft of the driving motor 2 is fixedly connected to the flywheel.

[0068] In this embodiment, the output shaft of the second driving motor drives the flywheel to rotate, the flywheel drives the connecting rod to move, the connecting rod drives the vibration shaft 32 to slide in the guide sleeve, and the movement of the vibration shaft 32 drives the screen box body 18 to vibrate.

[0069] The upper and lower vibration mechanism 5 includes a vibration seat 47, a transmission shaft 2 51 and a rotating wheel 48. The vibration seat 47 is detachably arranged on the side of the supporting plate 24 located in the middle position of the screen mechanism 23. The rotating wheel 48 is located in the vibration seat 47. The transmission shaft 2 51 is rotatably arranged on the fixed plate 4, and the transmission shaft 2 51 is transmission connected with the transmission shaft 1. The transmission shaft 2 51 extends into the screen box body 18. An avoidance hole 50 is opened inside the vibration seat 47. The vibration seat 47 is provided with symmetrically arranged bar teeth 49. A fixed shaft is provided on the rotating wheel 48. The transmission shaft 2 51 is transmission connected with the fixed shaft. The fixed shaft is slidably arranged in the avoidance hole 50. The rotating wheel 48 is provided with arc teeth 25, and the two bar teeth 49 are intermittently meshed with the arc teeth 25.

[0070] In this embodiment, the output shaft of the driving motor 3 drives the transmission shaft 1 to rotate, the transmission shaft 1 drives the transmission shaft 2 51 to rotate, the transmission shaft 2 51 drives the rotating wheel 48 and the arc-shaped teeth 25 to rotate, and the arc-shaped teeth 25 intermittently mesh with the two bar teeth 49 during movement. When meshing, the reaction causes the vibration seat 47 to move up and down, and the fixed axis of the rotating wheel 48 slides in the avoidance hole 50.

[0071] The working principle of the present invention is as follows: the flap mechanism moves to open the rear side of the screen box body 18, that is, the telescopic ends of the two electric push rods 8 extend to drive the flap 9 to move, so that the flap 9 no longer conflicts with the screen box body 18, which is convenient for installing and replacing the screen 22. The staff installs the screen 22 of appropriate specifications from the rear side of the screen box body 18 according to the specifications of the coated sand coating required, and fixes the screen 22 in the installation groove 29 through the cooperation of the fixing plate 1 33, the tightening screw 35, the fixing plate 2 34 and the buckle plate 36, which is convenient for installation, disassembly and replacement. The screening machine is started. During screening, the telescopic ends of the two electric push rods 8 are retracted to drive the flap 9 to move, so that the flap 9 conflicts with the screen box body 18, and the eccentric vibration mechanism 6 moves to drive the screen box mechanism 10 and the screen mechanism 23 to move, that is, the output shaft of the driving motor 2 drives the flywheel to rotate, the flywheel drives the vibration shaft 32 to move, and the vibration shaft 32 moves to drive the screen box body 18 to vibrate, and the left and right vibrations are When the screen box body 18 is vibrated left and right, the output shaft of the driving motor 3 drives the transmission shaft 1 and the high-pressure fan 4 to rotate, the transmission shaft 1 drives the upper and lower vibration mechanisms 5 to move, and the upper and lower vibration mechanisms 5 drive the screen mechanism 23 to vibrate up and down. At the same time, the transmission mechanism 2 drives the scattering roller 7 to move, that is, the output shaft of the driving motor 3 drives the transmission shaft 1 to rotate, the transmission shaft 1 drives the transmission shaft 2 51 to rotate, the transmission shaft 2 51 drives the runner 48 and the arc-shaped teeth 25 to rotate, and the arc-shaped teeth 25 are intermittently meshed with the two bar teeth 49 during movement. During meshing, the reaction makes the vibration seat 47 move up and down, and the fixed shaft of the runner 48 slides in the avoidance hole 50. The transmission shaft 1 drives the scattering roller 7 to move and drives the several blades 30 thereon to rotate. During screening, the coated sand raw material falls on the rotating scattering roller 7, and is beaten by the several blades 30 on the scattering roller 7 to disperse the coated sand raw material, so that the screening effect is better. Subsequently, the staff continuously puts the coated sand raw material into the screen box body 18. After being broken up by the breaking roller 7, the screen mechanism 23 vibrates up and down and left and right under the drive of the up and down vibrating mechanism 5 and the eccentric vibrating mechanism 6, that is, the screen 22 vibrates up and down and left and right under the drive of the up and down vibrating mechanism 5 and the eccentric vibrating mechanism 6. The coated sand raw material is vibrated and screened from the top screen 22 downwards again and again to form different types of coated sand coatings. During screening, the screen 22 is tilted to facilitate extending the screening path and enhancing the screening effect. Coated sand coatings of different specifications are guided into the corresponding position of the aggregate cavity through the corresponding position of the aggregate plate, and the coated sand coating in the aggregate cavity enters The discharge hopper 16 at the corresponding position collects the coated sand through the discharge port at the corresponding position to form finished coated sand coating products of different specifications. After the screening is completed, a plurality of scraper mechanisms 21 move to scrape off the coated sand raw materials engaged on the screen mechanism 23, that is, the electric screw member 44 moves synchronously, and the screw sliders of the two electric screw members 44 drive the sliding block 45 to slide in the sliding groove 28, so that the scraper 46 scrapes the surface of the screen 22 to avoid the coated sand raw materials being engaged on the screen 22, so as to keep the equipment clean. The inclined screen mechanism 23 vibrates up and down and left and right, so that the movement track of the coated sand raw materials on the screen mechanism 23 is longer, the coated sand raw materials are more dispersed, and the screening effect is better; During screening, smoke and dust are generated, which are sucked into the external filter box, filtered by the external filter box and then discharged through the high-pressure fan 4. During cleaning, the sucked air is transported to the external multi-way valve through the high-pressure fan 4, and then transported to several air guns through the external multi-way valve. The screen box body 18 and the screen mechanism 23 are cleaned by the several air guns, and the generated dust is sucked into the external filter box, filtered by the external filter box and then transported to the external multi-way valve through the high-pressure fan 4, and then sprayed out again through several air guns to form a wind circulation.

[0072] In summary, the screen box mechanism 10 cooperates with the frame 1 to tilt the screen box mechanism 10, which is convenient for screening and collection of finished products; The flap 9 is folded up by the flap mechanism, and contacts the screen box body 4 to prevent dust, thereby ensuring a clean production environment. The flap 9 is opened and does not contact the screen box body 4, thereby facilitating the installation of the screen. The coating sand raw material is broken up by the cooperation of the breaking roller 7 and the blade 30 to improve the screening effect, and the breaking roller 7 cooperates with the material blocking plate 52 to prevent the broken raw material from splashing out and ensure the screening environment; The screen 22 is fixed by the locking assembly 27 to ensure that the screen 22 works stably during screening, and cooperates with the support plate 24 to facilitate the installation and replacement of the screen 22; The screen mechanism 23 is vibrated up and down by the screen mechanism 23, the transmission mechanism 2, the drive motor 3 and the up and down vibration mechanism 5, which has low energy consumption and good vibration effect, and cooperates with the screen box mechanism 10 and the eccentric vibration mechanism 6 to drive the screen mechanism 23 to vibrate left and right, so that the coated sand raw materials are dispersed, the screening efficiency is improved, and the screening path is extended to ensure the screening quality; The high-pressure fan 4 cooperates with the external multi-way valve, the dust suction port 19, a plurality of air guns and an external filter box to suck dust, form an air circulation, clean the interior, and keep the environment clean.

[0073] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A screening machine for producing coated sand coatings, comprising a frame (1), an upper and lower vibration mechanism (5), a screen mechanism (23) and a screen box mechanism (10), characterized in that: The screen box mechanism (10) is hinged at the lower inner side of the frame (1); the screen mechanism (23) is arranged in the screen box mechanism (10); the upper and lower vibration mechanisms (5) are arranged on the screen mechanism (23); the upper end surface of the frame (1) is provided with a transmission mechanism (2), a drive motor (3) and a high-pressure fan (4); the output shaft end of the drive motor (3) is transmission-connected to the blade shaft of the high-pressure fan (4); the output shaft of the drive motor (3) is transmission-connected to the transmission mechanism (2); the transmission mechanism (2) is transmission-connected to the upper and lower vibration mechanisms (5); an eccentric vibration mechanism (6) is transmission-connected to the side of the frame (1); the eccentric vibration mechanism (6) is transmission-connected to the screen box mechanism (10); A plurality of return springs (13) are provided between the left and right sides of the box mechanism (10) and the frame (1); a flap mechanism is provided on the rear side of the screen box mechanism (10); a plurality of air guns are provided on the inner top of the screen box mechanism (10); the plurality of air guns are connected to an external multi-way valve via a pipeline; the external multi-way valve is connected to an air outlet of a high-pressure fan (4) via a pipeline; the air inlet of the high-pressure fan (4) is connected to an external filter box via a pipeline; the external filter box is connected to the screen box mechanism (10) via a pipeline; a scattering roller (7) is provided on the inner rear side of the screen box mechanism (10); the scattering roller (7) is located above the screen mechanism (23); and a plurality of scraper mechanisms (21) are provided on the screen mechanism (23); The screen box mechanism (10) comprises a screen box body (18), wherein a plurality of symmetrically arranged and evenly spaced fixed spring assemblies are provided on the left and right sides of the screen box body (18), and the fixed spring assemblies comprise a first mounting plate (37) and a second mounting plate (39); The screen mechanism (23) comprises a plurality of vertically equidistant supporting plates (24), the bottommost supporting plates (24) being arranged on a plurality of mounting plates (39), two groups of symmetrically arranged connecting spring assemblies (26) being arranged between two adjacent supporting plates (24), the connecting spring assemblies (26) of each group being equidistantly arranged, and the connecting spring assemblies (26) being close to the side of the supporting plate (24), the inner upper end of each supporting plate (24) being provided with a symmetrically arranged sliding groove (28) and a symmetrically arranged mounting groove (29), the mounting groove (29) being located below the sliding groove (28) at a corresponding position, the two symmetrically arranged mounting grooves (29) being detachably provided with screens (22), and the rear end surface of each supporting plate (24) being provided with a symmetrically arranged locking assembly (27).

2. A screening machine for producing coated sand coating according to claim 1, characterized in that: The four corners of the lower top of the frame (1) are each provided with a suspension hinge seat (12), and the four suspension hinge seats (12) are symmetrically arranged in pairs. A fixing plate three is provided at the upper end of the frame (1), a driving motor one (3) and a high-pressure fan (4) are arranged on the fixing plate three, and a fixing plate four is provided on both left and right sides of the frame (1); The screen box mechanism (10) is tilted, and two symmetrically arranged suspension connecting rods (14) are provided on the front side of the upper end of the screen box body (18), and the two suspension connecting rods (14) are respectively hinged to the suspension hinge seats (12) at corresponding positions. Two symmetrically arranged suspension connecting rods (15) are provided on the rear side of the upper end of the screen box body (18), and the two suspension connecting rods (15) are respectively hinged to the suspension hinge seats (12) at corresponding positions. A plurality of fixed spring assemblies are all close to the bottom of the screen box body (18), and a plurality of vertically evenly distributed baffle plates (52) are provided on the rear side of the screen box body (18), and the baffle plates (52) are all located at corresponding positions. A scraper mechanism (21) is arranged above the screen box body (18), fixing rods (20) are arranged on both sides of the left and right sides of the screen box body (18), a feed hopper (17) is arranged on the rear side of the upper end of the screen box body (18), a collecting hopper (11) is arranged on the front side of the screen box body (18), a plurality of collecting cavities are arranged inside the collecting hopper (11), a collecting plate is arranged on the rear side of the collecting cavities, and the collecting plate extends into the screen box body (18), a discharge hopper (16) is arranged on the front side of the collecting cavities, and the discharge ports of the plurality of discharge hoppers (16) are alternately distributed, and a plurality of dust suction ports (19) are opened on the upper end of the screen box body (18), and the plurality of dust suction ports (19) are connected to an external filter box through pipelines.

3. A screening machine for producing coated sand coating according to claim 2, characterized in that: The first mounting plate (37) is fixed to the left and right end surfaces inside the screen box body (18), the first mounting plate (37) is close to the inner bottom of the screen box body (18), the second mounting plate (39) is arranged below the screen mechanism (23), and a fixing spring (38) is arranged between the first mounting plate (37) and the second mounting plate (39).

4. A screening machine for producing coated sand coating according to claim 3, characterized in that: The front end of the support plate (24) is located above the collecting plate at the corresponding position. The locking assembly (27) includes a fixing plate (33), a tightening screw (35) and a fixing plate (34). The fixing plate (33) and the fixing plate (34) are both fixed on the rear end surface of the support plate (24). The fixing plate (33) and the fixing plate (34) are respectively located on the upper and lower sides of the mounting groove (29). A buckle plate (36) is rotatably provided on the fixing plate (33). A snap block is provided on the fixing plate (34). The buckle plate (36) is snapped on the snap block. The fixing screws (35) are all passed through the buckle plate (36) and are screwed on the second fixing plate (34). The connecting spring assembly (26) includes an upper top plate (40), a lower top plate (41) and a connecting plate (42) which are arranged in sequence from top to bottom. The upper top plate (40) is arranged on the lower end surface of the supporting plate (24) at a corresponding position, and the lower top plate (41) is arranged on the upper end surface of the supporting plate (24) at a corresponding position. Two connecting springs (43) are arranged between the upper top plate (40) and the connecting plate (42) and between the lower top plate (41) and the connecting plate (42).

5. A screening machine for producing coated sand coating according to claim 4, characterized in that: The transmission mechanism (2) comprises a transmission shaft 1 and four bearing seats, the axes of the four bearing seats are collinear, two of the bearing seats are fixed on the left and right sides of the upper end of the frame (1), and the other two bearing seats are fixed on the left and right sides of the upper end of the fixed plate 3. The transmission shaft 1 is fixed inside the inner rings of the four bearing seats, and the transmission shaft 1 is connected to the output shaft of the drive motor 1 (3) via a pulley pair.

6. A screening machine for producing coated sand coating according to claim 5, characterized in that: The scraper mechanism (21) comprises a scraper (46) and two electric screw members (44) symmetrically arranged on the left and right sides, the two electric screw members (44) are respectively arranged on the left and right sides of the upper end of the support plate (24) at corresponding positions, the scraper (46) is fixed on the screw sliders of the two electric screw members (44), the lower end surface of the scraper (46) contacts the upper end surface of the screen (22) at the corresponding position, and sliding blocks (45) are provided on the left and right sides of the scraper (46), and the two sliding blocks (45) are respectively slidably arranged in the sliding grooves (28) at the corresponding positions.

7. A screening machine for producing coated sand coating according to claim 6, characterized in that: The scattering roller (7) is rotatably arranged in the screen box body (18) and extends out of the screen box body (18). The scattering roller (7) is located below the feed hopper (17). The scattering roller (7) is located in front of the uppermost material baffle plate (52) in the screen box body (18). The two ends of the scattering roller (7) are connected to the transmission shaft through a pulley pair. The scattering roller (7) is detachably provided with a plurality of paddles (30) evenly distributed around the circumference.

8. A screening machine for producing coated sand coating according to claim 7, characterized in that: The flap mechanism comprises two electric push rods (8) and a flap (9), wherein the flap (9) is hinged to the rear side of the screen box body (18), one end of the two electric push rods (8) is respectively hinged to the rear end surface of the flap (9), and the other ends of the two electric push rods (8) are respectively hinged to the fixing rods (20) on both sides of the screen box body (18).

9. A screening machine for producing coated sand coating according to claim 8, characterized in that: The eccentric vibration mechanism (6) comprises a second drive motor, a vibrator housing (31) and a vibration shaft (32). The vibrator housing (31) is fixed on a fourth fixing plate. A guide sleeve is provided on the vibrator housing (31). The vibration shaft (32) is slidably arranged in the guide sleeve. The end of the vibration shaft (32) is fixed on the screen box body (18). A flywheel is rotatably arranged in the vibrator housing (31). A connecting rod is hinged between the flywheel and the vibration shaft (32). The end of the vibration shaft (32) is fixed on the fixing rod (20). The output shaft of the second drive motor is fixedly connected to the flywheel.

10. A screening machine for coating sand production according to claim 9, characterized in that: The upper and lower vibration mechanism (5) comprises a vibration seat (47), a second transmission shaft (51) and a rotating wheel (48). The vibration seat (47) is detachably arranged on the side of a supporting plate (24) located in the middle of the screen mechanism (23). The rotating wheel (48) is located in the vibration seat (47). The second transmission shaft (51) is rotatably arranged on the fourth fixing plate, and the second transmission shaft (51) is in transmission connection with the first transmission shaft. The second transmission shaft (51) extends into the screen box body (18). An avoidance hole (50) is provided inside the vibration seat (47). The vibration seat (47) is provided with symmetrically arranged bar teeth (49). A fixed shaft is provided on the rotating wheel (48). The second transmission shaft (51) is in transmission connection with the fixed shaft. The fixed shaft is slidably arranged in the avoidance hole (50). The rotating wheel (48) is provided with arc teeth (25), and two bar teeth (49) are intermittently meshed with the arc teeth (25).

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