Anti-blocking fluidized bed screening structure and screening method using reverse blowing

Abstract

The invention relates to the technical field of material screening equipment, in particular to an anti-blocking fluidized bed screening structure utilizing reverse blowing and a screening method.The anti-blocking fluidized bed screening structure utilizing reverse blowing and the screening method.The anti-blocking fluidized bed screening structure utilizing reverse blowing comprises a shell, a screening cavity is formed in the shell, and a screening piece is elastically arranged in the screening cavity in a sliding mode; a first valve body assembly and a second valve body assembly are arranged on the screening cavity; a switching assembly is arranged in the shell and connected with the first valve body assembly through a deflection structure, when the screening piece descends to the preset height, the screening piece is matched with the switching assembly, the deflection structure can be driven to act, then the flowing direction of fluid in the screening cavity is changed, particles blocked on the screening piece are impacted, and the screening effect is improved. The blocked particles and the fluid are discharged out of the screening cavity through the first valve body assembly; and when the screening piece restores to the initial position, the flowing direction of the fluid in the screening cavity restores, and the fluid can be screened again.

Description

Technical Field

[0001] The invention relates to the technical field of material screening equipment, in particular to an anti-blocking fluidized bed screening structure and a screening method utilizing reverse blowing. Background Art

[0002] Vibrating fluidized bed is a special drying equipment that applies vibration to ordinary fluidized bed. Place a layer of material on the conveyor plate, and vibrate the conveyor plate. When the vibration acceleration is greater than the gravity acceleration, the material layer begins to expand, and the so-called vibrating fluidized state appears. At this time, the material placed on the conveyor plate is strongly mixed and can easily move horizontally and tilted. Under this condition, heat can be supplied to the material layer by convection, conduction, radiation, etc., to achieve the purpose of drying.

[0003] In fact, when using a vibrating fluidized bed to dry and transport materials, the materials will aggregate and adsorb due to static electricity, excessive humidity and other reasons. As time goes by, these aggregated materials will clog the screen plate, causing the permeability of the screen plate to decrease due to the blockage of the materials. At this time, the screening efficiency of the fluidized bed when screening materials will be affected.

[0004] In order to solve the blockage problem of the fluidized bed, the material needs to be dried before feeding to reduce the humidity of the device, thereby reducing the possibility of agglomeration and adhesion. However, when actually using the fluidized bed for screening, the humidity of the material cannot be accurately controlled, and material agglomeration will still occur. The agglomeration of the material will affect the flow of gas above the sieve plate per unit time, resulting in a gradual decrease in the material discharge volume. Under the premise of a constant material addition amount, the material will eventually accumulate on the sieve plate, affecting the drying efficiency and drying effect. The operating method for the influence of material agglomeration on the drying efficiency and drying effect is to monitor the discharge volume in real time or manually observe the discharge volume. When the discharge volume is low, the machine is manually stopped, and then the blockage of the sieve plate is dealt with by manual blowing or other blowing methods. The operating process is complicated. Summary of the invention

[0005] The object of the present invention is to provide an anti-clogging fluidized bed screening structure and screening method using reverse blowing to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The anti-blocking fluidized bed screening structure using reverse blowing comprises: a shell, a screening chamber is arranged in the shell, a screening element is elastically and slidably arranged in the screening chamber, and a first valve body assembly and a second valve body assembly are arranged on the screening chamber;

[0008] A switching assembly is provided in the housing, and the switching assembly is connected to the first valve body assembly through a deflection structure. When the screening element is lowered to a preset height, the screening element cooperates with the switching assembly to drive the deflection structure to move, thereby changing the flow direction of the fluid in the screening chamber and impacting the particles blocked on the screening element, so that the blocked particles and the fluid are discharged from the screening chamber through the first valve body assembly;

[0009] When the screening element returns to its initial position, the flow direction of the fluid in the screening chamber is restored, and the fluid can be screened again.

[0010] The anti-blocking fluidized bed screening structure using reverse blowing as described above: a baffle plate is fixedly arranged in the screening chamber, and the screening element includes a screen plate group slidably arranged in the screening chamber, a support rod is fixedly arranged on the side of the screen plate group away from the baffle plate, a lifting plate is fixedly arranged on one end of the support rod passing through the screening chamber, and a first spring is also slidably arranged on the support rod, one end of the first spring abuts against the baffle plate, and the other end abuts against the bottom wall of the screening chamber.

[0011] As described above, the anti-blocking fluidized bed screening structure using reverse blowing: the switching component includes a trigger structure, a lifting member and a transverse moving member, the lifting member includes a trigger plate fixedly connected to the lifting plate, and a circular groove is provided on the trigger plate.

[0012] The anti-blocking fluidized bed screening structure using reverse blowing as described above: the trigger structure includes a moving sleeve slidably arranged in the housing and a trigger rod penetrating the moving sleeve and slidably cooperating with the moving sleeve, and the moving sleeve is provided with a first pulley, and the first pulley cooperates with the transverse moving member;

[0013] A blocking piece is formed on the trigger rod, and a second spring and a third spring are slidably arranged at both ends of the blocking piece, one end of the second spring abuts against the blocking piece, and the other end abuts against the inner wall of the port at one end of the movable sleeve, and one end of the third spring abuts against the blocking piece, and the other end abuts against the inner wall of the port at the other end of the movable sleeve;

[0014] A second pulley is disposed at one end of the trigger rod, and the second pulley is slidably disposed in the circular groove. The other end of the trigger rod is connected to the deflection structure.

[0015] The anti-clogging fluidized bed screening structure using reverse blowing as described above: the transverse moving member includes a moving plate fixedly connected to the lifting plate, an inclined groove is provided on the moving plate, and the first pulley is arranged in the inclined groove.

[0016] As described above, in the anti-clogging fluidized bed screening structure using reverse blowing, the deflection structure comprises a connecting rod fixedly connected to the trigger rod, and a tooth plate is fixedly provided at one end of the connecting rod away from the trigger rod.

[0017] The anti-clogging fluidized bed screening structure using reverse blowing as described above: the first valve body assembly includes a second ball valve rotatably installed in the outer shell, the second ball valve is connected to the interior of the screening chamber through the first air inlet pipe and the second air inlet pipe respectively, and a second valve core is sealably rotatably installed in the second ball valve, and a gear meshing with the toothed plate is coaxially fixed on the valve shaft of the second valve core.

[0018] The anti-clogging fluidized bed screening structure using reverse blowing as described above: the second valve body assembly includes a first ball valve rotatably installed in the outer shell, the first ball valve is connected to the interior of the screening chamber through a first air outlet pipe and a second air outlet pipe respectively, and a first valve core is sealably rotatably installed in the first ball valve, and the valve shaft of the first valve core is connected to the valve shaft of the second valve core through a linkage belt.

[0019] A blocking-proof fluidized bed screening method using reverse blowing is also proposed, which uses the blocking-proof fluidized bed screening structure using reverse blowing as described above, and includes the following steps:

[0020] Step 1: Check the first ball valve and the second ball valve to ensure that the second valve core is connected to the second air inlet pipe, and the first valve core is connected to the first air outlet pipe. At this time, the second pulley is located at the turning point of the round-shaped groove;

[0021] Step 2: wet material is introduced into the screening chamber through the feed port, and hot air is introduced into the screening chamber through the first air inlet pipe. The hot air passes through the sieve plate group and the first air outlet pipe, and is finally discharged through the air outlet;

[0022] Step 3: After a long period of screening, the agglomerated materials due to static electricity, humidity and / or temperature will be blocked in the sieve holes of the sieve plate group, forcing the sieve plate group to descend. During the descent, the second pulley slides along the circular groove to the next turning point of the circular groove, and the moving sleeve further compresses the third spring;

[0023] Step 4: When the second pulley moves to the next inflection point, the trigger rod drives the deflection structure to drive the second valve core to rotate a certain angle, so that the second valve core is connected to the first air inlet pipe, and the first valve core is deflected and connected to the second air outlet pipe;

[0024] Step 5: After the screen plate group returns to the initial height, the trigger rod drives the deflection structure to drive the first valve core and the second valve core to return to the initial position, so as to continue screening.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The screening chamber is divided into two groups of upper and lower chambers by setting a sieve plate group. When the screening chamber vibrates, the sieve plate group will screen the material, thereby dividing the material into two different grades of coarse and fine. During screening, the material will agglomerate due to static electricity, temperature, humidity and other reasons, and the sieve plate of the sieve plate group will be blocked. Therefore, by setting a switching component, a first valve body component and a second valve body component, the sieve hole can be dredged by utilizing the cooperation between the components.

[0027] Hot air is injected into the screening chamber through the first valve body assembly, and the hot air enters the lower chamber through the second air inlet pipe, passes through the sieve plate group to fluidize the wet material, enters the upper chamber, and is discharged from the first air outlet pipe. In this process, the large-size particles agglomerated in the sieve holes due to static electricity will force the sieve plate group to descend. Then, the descending sieve plate group will force the movable sleeve to move toward the trigger plate with the cooperation of the trigger plate and the movable plate, until the sieve plate group descends to a preset height, the trigger rod will move away from the movable plate and drive the deflection structure to move, and then force the first valve body assembly and the second valve body assembly to switch, so as to change the flow direction of the hot air. The above-mentioned switching process of the hot air flow direction is not affected by material dust, temperature, and humidity. The hot air changes the flow direction and enters the screening chamber from the upper chamber, which can blow the agglomerated large-size materials into fine particles. These fine particles will pass through the screen plate group under the flow of hot air and enter the lower chamber. At this time, a small part of the fine particles will be discharged from the screening chamber with the hot air, and the rest will be attached to the inner wall of the lower chamber due to the blowing of the hot air. In this process, the hot air will dredge the materials blocked in the screen holes, so that the screen plate group can continue to perform efficient screening operations. After the screen plate group is dredged, the rising screen plate group will switch the flow speed of the hot air again with the cooperation of the trigger plate and the moving plate, so that the hot air can re-enter the lower chamber to continue the screening operation.

[0028] In the above process, when screening materials, the sieve plate group will automatically switch the flow direction of the hot air according to its own position, and the entire switching process is not affected by factors such as material temperature, humidity, dust, etc., so that the sieve plate group can accurately and stably switch the flow direction of the hot air to perform clearing and screening operations, and the overall operation process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of an anti-clogging fluidized bed screening structure using reverse blowing.

[0030] Figure 2 It is a schematic diagram of the structure inside the shell of the anti-clogging fluidized bed screening structure using reverse blowing.

[0031] Figure 3 It is a schematic diagram of the structure of the screening chamber in the anti-clogging fluidized bed screening structure using reverse blowing.

[0032] Figure 4 It is a schematic diagram of the structure of the screening element in the anti-clogging fluidized bed screening structure using reverse blowing.

[0033] Figure 5 It is a schematic diagram of the structure of the trigger structure in the anti-clogging fluidized bed screening structure using reverse blowing.

[0034] Figure 6 It is a structural schematic diagram of the cooperation between the first valve body assembly and the second valve body assembly and the screening chamber in the anti-clogging fluidized bed screening structure using reverse blowing.

[0035] Figure 7 It is a schematic structural diagram of the first valve body assembly and the second valve body assembly in the anti-clogging fluidized bed screening structure using reverse blowing.

[0036] Figure 8 It is a structural schematic diagram of the first valve core and the second valve core in the anti-clogging fluidized bed screening structure using reverse blowing.

[0037] Fig. 9 It is a structural schematic diagram of the connection between the deflection structure and the first valve body assembly in the anti-clogging fluidized bed screening structure using reverse blowing.

[0038] Fig.10 It is a schematic diagram of the structure of the deflection structure in the anti-clogging fluidized bed screening structure using reverse blowing.

[0039] In the figure: 1, housing; 101, discharge port; 2, upper cover; 201, air inlet; 202, feed port; 203, air outlet; 3, screening chamber; 301, limit plate; 4, baffle plate; 5, movable sleeve; 501, slide rod; 502, first pulley; 6, trigger rod; 601, baffle; 602, second pulley; 7, connecting rod; 8, tooth plate; 801, gear; 9, second discharge pipe; 10, linkage belt; 11, first ball valve; 12, second ball valve valve; 13, first discharge pipe; 14, second air outlet pipe; 15, sieve plate group; 1501, blocking plate; 1502, guide plate; 16, first spring; 17, lifting plate; 18, support rod; 19, trigger plate; 1901, return groove; 20, moving plate; 2001, inclined groove; 21, second spring; 22, third spring; 23, second air inlet pipe; 24, first air inlet pipe; 25, first air outlet pipe; 26, first valve core; 27, second valve core. DETAILED DESCRIPTION

[0040] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0041] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0042] In addition, in order to better illustrate the present application, numerous specific details are provided in the specific embodiments below. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, and elements well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0043] See also Figure 1-Figure 10 In an embodiment of the present invention, a blocking-proof fluidized bed screening structure using reverse blowing comprises:

[0044] A housing 1, wherein a screening chamber 3 is disposed in the housing 1, a screening element is elastically and slidably disposed in the screening chamber 3, and a first valve body assembly and a second valve body assembly are disposed on the screening chamber 3;

[0045] A switching assembly is provided in the housing 1, and the switching assembly is connected to the first valve body assembly through a deflection structure. When the screening element is lowered to a preset height, the screening element cooperates with the switching assembly to drive the deflection structure to move, thereby changing the flow direction of the fluid in the screening chamber 3 and impacting the particles blocked on the screening element, so that the blocked particles and the fluid are discharged from the screening chamber 3 through the first valve body assembly;

[0046] When the screening element returns to its initial position, the flow direction of the fluid in the screening chamber 3 is restored, and the fluid can be screened again;

[0047] A baffle plate 4 is fixedly arranged in the screening chamber 3, and the screening element includes a screen plate group 15 slidably arranged in the screening chamber 3, and a support rod 18 is fixedly arranged on the side of the screen plate group 15 away from the baffle plate 4, and a lifting plate 17 is fixedly arranged on one end of the support rod 18 that passes through the screening chamber 3, and a first spring 16 is also slidably arranged on the support rod 18, one end of the first spring 16 abuts against the baffle plate 4, and the other end abuts against the bottom wall of the screening chamber 3;

[0048] Preferably, see Figure 1 , Figure 3 , Figure 4 The sieve plate group 15 includes an upper sieve plate and a lower sieve plate, wherein the sieve holes on the upper sieve plate are larger than the sieve holes on the lower sieve plate. In particular, a blocking plate 1501 and a guide plate 1502 (such as Figure 3As shown), and three groups of support rods 18 are equidistantly arranged along the length direction of the sieve plate group 15. In the initial state, the first spring 16 is in a compressed state. The first spring 16 in the compressed state pushes the lower sieve plate to fit with the baffle plate 4 formed in the sieving chamber 3, and at the same time makes the lifting plate 17 fit with the bottom of the sieving chamber 3 (as shown). Figure 3 shown);

[0049] Specifically, the sieve plate group 15 divides the screening chamber 3 into two upper and lower chambers. The housing 1 is provided with a vibration motor. When the vibration motor is working, it can drive the screening chamber 3 to generate forced vibration. In actual use, the wet material will first enter the upper chamber from the feed port 202 and fall onto the upper sieve plate. The hot air will pass into the screening chamber 3 from the lower chamber to fluidize the wet material and then flow out from the upper chamber. At the same time, under the vibration of the screening chamber 3, the small-sized material will pass through the upper sieve plate and fall onto the lower sieve plate. At this point, the material is divided into two equal parts with different coarseness and fineness. With the flow of hot air, the fluidized wet material will jump toward the direction of the guide plate 1502. Then the coarse-sized material will jump on the upper sieve plate to the first discharge pipe 13 formed on the upper chamber, and then enter the discharge port 101. The fine-sized material will jump on the lower sieve plate to the second discharge pipe 9 formed on the lower chamber, and then be discharged from the housing 1.

[0050] In particular, during actual use, some materials with static electricity, humidity or easy adhesion will form agglomerates on the sieve plate and then block the sieve plate. After long-term use, the sieve holes may be blocked more and more, thereby reducing the permeability of the sieve plate group 15. At this time, the screening efficiency of the sieve plate group 15 will decrease. At the same time, the materials accumulated on the sieve holes will force the sieve plate group 15 to drive the lifting plate 17 to move downward toward the ground, thereby increasing the compression amount of the first spring 16 until the sieve plate group 15 moves to a preset height, and the switching component is triggered to change the flow direction of the hot air, so that the hot air enters from the upper chamber, passes through the sieve plate group 15, and is discharged from the upper chamber. In this process, the hot air will dredge the sieve holes of the sieve plate group 15, and disperse the large-particle materials accumulated and blocked on the sieve plate group 15, thereby achieving the purpose of dredging the sieve plate group 15, so that the subsequent sieve plate group 15 can continue to perform efficient material screening operations.

[0051] In detail, when the hot air blows from the sieve holes on the lower sieve plate toward the upper sieve plate, the material is sprayed and dried, and at the same time, a force is generated on the material to move toward the first discharge pipe 13 and the second discharge pipe 9 to achieve discharge. When the sieve plate group 15 moves to a preset height, the switching component is triggered (the triggering method can be a contact sensor and the sieve plate group 15 contact trigger, or an infrared sensor induction trigger, etc.), and the hot air enters from the upper chamber of the screening chamber 3 and is sprayed into the lower chamber. During the spraying process, the force generated by the hot air on the material will cause the material to move and accumulate on the guide plate 1502. At the same time, the continuously flowing hot air can disperse the material that has agglomerated due to static electricity, so that the agglomerated large The particle size material is dispersed into fine particles. With the continuous introduction of hot air, these fine particles will pass through the upper sieve plate and the lower sieve plate and fall into the lower chamber of the screening chamber 3. Then the weight of the sieve plate group 15 is reduced. Combined with the effect of the first spring 16 releasing the elastic potential energy, the height of the sieve plate group 15 will quickly recover. After the height of the sieve plate group 15 recovers to the initial height, the switching component is triggered again, and the hot air will enter the screening chamber 3 from the lower chamber again, and then pass through the lower sieve plate to blow toward the upper sieve plate, thereby continuing the material drying operation. In this process, the fine material falling into the lower chamber will pass through the lower sieve plate under the blowing of the hot air, and be discharged from the second discharge pipe 9 together with the material falling from the upper sieve plate.

[0052] Considering that in actual application, the granular materials (such as plastic, rubber, polymer, resin) in the fluidized bed will produce a small amount of floating dust, and the dust sedimentation will affect the normal operation of the contact sensor and cause false touches; the floating dust will affect the propagation of infrared light in the infrared sensor. Therefore, although the above method is widely used in industry, it will inevitably increase false touches or reduce sensing accuracy.

[0053] For further information, see Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 The switching assembly includes a trigger structure, a lifting member and a transverse moving member, the lifting member includes a trigger plate 19 fixedly connected to the lifting plate 17, and a circular groove 1901 is provided on the trigger plate 19;

[0054] The trigger structure includes a moving sleeve 5 slidably disposed in the housing 1 and a trigger rod 6 penetrating the moving sleeve 5 and slidably cooperating with the moving sleeve 5, and a first pulley 502 is disposed on the moving sleeve 5, and the first pulley 502 cooperates with the transverse moving member;

[0055] Preferably, see Figure 2 , Figure 3 , Figure 5 A sliding rod 501 is fixedly provided on the above-mentioned movable sleeve 5, and the sliding rod 501 is slidably provided in a limiting plate 301 fixedly provided on the outer wall of the screening chamber 3. With the cooperation of the limiting plate 301 and the transverse moving member, the movable sleeve 5 can only slide relative to the screening chamber 3 along its axial direction.

[0056] The trigger rod 6 is formed with a blocking piece 601, and two ends of the blocking piece 601 are slidably provided with a second spring 21 and a third spring 22, one end of the second spring 21 abuts against the blocking piece 601, and the other end abuts against the inner wall of the port at one end of the movable sleeve 5, and one end of the third spring 22 abuts against the blocking piece 601, and the other end abuts against the inner wall of the port at the other end of the movable sleeve 5;

[0057] A second pulley 602 is disposed at one end of the trigger rod 6, and the second pulley 602 is slidably disposed in the circular groove 1901, and the other end of the trigger rod 6 is connected to the deflection structure;

[0058] The transverse moving member comprises a moving plate 20 fixedly connected to the lifting plate 17, an inclined groove 2001 is formed on the moving plate 20, and the first pulley 502 is arranged in the inclined groove 2001;

[0059] It should be noted that usually, the sensing units of electronic modules such as infrared sensors and contact sensors do not exist independently, but need to communicate with the control module (such as logic control circuit, PLC controller, etc.), and the control module sends action instructions to the execution unit. As we all know, electronic control modules (including but not limited to electronic control circuits, integrated modules, etc.) have relatively high requirements for working conditions (such as humidity, temperature, dust, etc.), and dust in a vulcanization environment is more likely to cause the above modules to fail.

[0060] For details, please refer to Figure 3 , Figure 4 , Figure 5 , Fig. 9 , the above-mentioned circular groove 1901 includes a reset upper groove, a reset lower groove, a vertical left groove and a vertical right groove. It should be particularly noted that the above-mentioned second spring 21 and the third spring 22 are exactly the same. In the initial state, the second spring 21 and the third spring 22 have the same elastic potential energy. At this time, the baffle 601 is located at the center of the movable sleeve 5, the second pulley 602 is located at the inflection point formed by the reset lower groove and the vertical right groove, and the first pulley 502 is located at the end of the travel of the inclined groove 2001 close to the ground;

[0061] In combination with the above, when the material enters the screening chamber 3 from the upper chamber for screening, the material is agglomerated and blocked in the sieve hole due to its own properties, and the sieve plate group 15 is forced to slowly approach the ground. The second pulley 602 will slide in the vertical right groove, and during the descent of the sieve plate group 15, the movable plate 20 will follow the lifting plate 17 to descend synchronously. At the same time, the contact and extrusion of the inclined groove 2001 on the first pulley 502 will force the movable sleeve 5 to move toward the trigger plate 19, and then the third spring 22 will be With further squeezing, the second spring 21 will be pulled up until the second pulley 602 moves to the inflection point formed by the vertical right groove and the reset upper groove, and the first pulley 502 just moves to the end of the stroke of the inclined groove 2001. Then, the third spring 22 and the second spring 21 will quickly release the elastic potential energy, so that the second pulley 602 drives the trigger rod 6 to slide along the reset upper groove, and when the second pulley 602 fits with the vertical left groove, the elastic potential energy stored in the second spring 21 and the third spring 22 will be restored to the same state;

[0062] During the movement of the trigger rod 6, the cooperation between the trigger rod 6 and the deflection structure can drive the first valve body assembly and the second valve body assembly to move, thereby adjusting the flow direction of the hot air: the direction of the hot air flowing from the lower chamber to the upper chamber is switched to the state of flowing from the upper chamber to the lower chamber, and the sieve holes of the sieve plate group 15 are cleared by the hot air sprayed in the reverse direction, so that the sieve plate group 15 can normally perform the material screening operation;

[0063] When the screen plate group 15 descends, it will drive the circular groove 1901 to trigger the trigger rod 6. The entire triggering process is not affected by floating dust, temperature, humidity, etc. Therefore, the actual blockage situation of the screen plate group 15 can be grasped more accurately, thereby improving the material screening efficiency of the fluidized bed.

[0064] When the sieve holes are being unblocked, the feeding process of the feed port 202 is stopped, and the hot air with the reversed flow direction will enter the screening chamber 3 from the upper chamber, and then the hot air will dry and blow the materials agglomerated on the sieve holes, thereby blowing away the agglomerated large-size materials and dispersing the large-size materials into fine particles. These fine particles will pass through the sieve plate group 15 and fall into the lower chamber under the blowing of the hot air. With the continuous flow of the hot air, a small part of the fine particles will follow the hot air to be discharged from the screening chamber 3, and the remaining fine particles will accumulate and adhere to the wall of the lower chamber due to the blowing of the hot air, thereby achieving the unblocking work of the sieve plate group 15;

[0065] Continuous material dredging will gradually reduce the weight of the sieve plate group 15. At the same time, combined with the release of the elastic potential energy of the first spring 16, the sieve plate group 15 will rise rapidly (relative to the speed of the sieve plate group 15 when it descends), and the second pulley 602 will slide in the vertical left groove. At the same time, the movable sleeve 5 will gradually move away from the trigger plate 19 under the cooperation of the first pulley 502 and the inclined groove 2001. Then the second spring 21 is squeezed and the third spring 22 is pulled up. After the sieve plate group 15 returns to its initial position, the second pulley 602 just moves to the vertical left groove. At the inflection point formed by the groove and the reset lower groove, the second spring 21 and the third spring 22 release the elastic potential energy to force the trigger rod 6 to pull the second pulley 602 along the reset lower groove back to the initial position. During this process, the deflection structure will drive the first valve body assembly and the second valve body assembly to move again, and restore the hot air flow direction to the initial flow state. During this process, the fine particles remaining in the lower chamber will follow the flow direction of the hot air and pass through the lower screen plate again, and mix with the material sieved from the upper screen plate to the lower screen plate, and finally be discharged together from the second discharge pipe 9.

[0066] For further information, see Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 The deflection structure includes a connecting rod 7 fixedly connected to the trigger rod 6, and a toothed plate 8 is fixedly provided at one end of the connecting rod 7 away from the trigger rod 6;

[0067] The first valve body assembly includes a second ball valve 12 rotatably mounted in the housing 1, the second ball valve 12 is connected to the interior of the screening chamber 3 through the first air inlet pipe 24 and the second air inlet pipe 23 respectively, and a second valve core 27 is rotatably mounted in the second ball valve 12, and a gear 801 meshing with the toothed plate 8 is coaxially fixed on the valve shaft of the second valve core 27;

[0068] For details, please refer to Figure 1 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 A through hole is formed on the second valve core 27. In the initial state, one end of the through hole is connected to the air inlet 201 formed on the upper cover 2 of the outer shell 1, and the air inlet 201 is connected to the blowing device arranged outside the outer shell 1 (not shown in the figure). The other end of the through hole is connected to the second air inlet pipe 23. When the blowing device is working, hot air will enter the screening chamber 3 from the lower chamber.

[0069] The second valve body assembly includes a first ball valve 11 rotatably mounted in the housing 1, the first ball valve 11 is connected to the interior of the screening chamber 3 through a first air outlet pipe 25 and a second air outlet pipe 14, and a first valve core 26 is rotatably mounted in the first ball valve 11, and the valve shaft of the first valve core 26 is connected to the valve shaft of the second valve core 27 through a linkage belt 10;

[0070] Preferably, see Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 The first valve core 26 is also provided with a through groove. In the initial state, one end of the through groove is connected to the air outlet 203 provided on the upper cover 2, and the other end is connected to the first air outlet pipe 25;

[0071] In combination with the above, when in use, the blowing device will continuously deliver hot air to the lower chamber of the screening chamber 3 through the second valve core 27, and the hot air will enter the screening chamber 3 and combine with the wet material entering the upper chamber, and then flow from the first air outlet pipe 25 to the air outlet 203. In this process, the hot air continuously flowing in the screening chamber 3 will cause the wet material to fluidize and leap forward, and the vibrating screening chamber 3 will also divide the material into two grades of coarse and fine with the cooperation of the screen plate group 15. When the screen plate group 15 drops to a certain height due to material accumulation, the feed port 202 will stop feeding, and the trigger rod 6 moving toward the trigger plate 19 under the action of the third spring 22 and the second spring 21 will pull the connecting rod 7 to follow the trigger rod 6 to move at the same time. At the same time, the tooth plate 8 is combined with the gear 801 to drive the second valve core 27 to rotate clockwise by a certain angle (combined with Figure 7 , Figure 8 , Fig. 9 , Fig.10 ), so that the through hole of the second valve core 27 is switched to be connected to the first air inlet pipe 24. During this process, due to the connection of the linkage belt 10, the first valve core 26 will follow the second valve core 27 to rotate synchronously by a certain angle, so that the through slot of the first valve core 26 is switched to be connected to the second air outlet pipe 14, and then the hot air will enter the screening chamber 3 from the upper chamber, and after the sieve holes are dredged, it will be discharged from the screening chamber 3 from the second air outlet pipe 14 until the sieve plate group 15 returns to the initial state. The sieve hole cleaning process of the sieve plate group 15 is completed, and the second valve core 27 and the first valve core 26 will also return to the initial position with the cooperation of the deflection structure, and the feed port 202 continues to feed. Then, the hot air with changed flow direction will continue to screen the wet material efficiently. The whole process is not affected by factors such as temperature, humidity, and dust, and the working state is relatively stable, so that the sieve plate group 15 can accurately and stably switch the flow direction of the hot air.

[0072] A blocking-proof fluidized bed screening method using reverse blowing is also proposed, which uses the blocking-proof fluidized bed screening structure using reverse blowing as described above, and includes the following steps:

[0073] Step 1: Check the first ball valve 11 and the second ball valve 12 to ensure that the second valve core 27 is connected to the second air inlet pipe 23, and the first valve core 26 is connected to the first air outlet pipe 25. At this time, the second pulley 602 is located at the inflection point of the round-shaped groove 1901;

[0074] Step 2: wet material is introduced into the screening chamber 3 through the feed port 202, and hot air is introduced into the screening chamber 3 through the first air inlet pipe 24. The hot air passes through the sieve plate group 15, passes through the first air outlet pipe 25, and is finally discharged through the air outlet 203;

[0075] Step 3: After a long period of screening, the agglomerated materials due to static electricity, humidity, temperature and other reasons will be blocked in the sieve holes of the sieve plate group 15, forcing the sieve plate group 15 to descend. During the descent, the second pulley 602 slides along the meandering groove 1901 to the next inflection point of the meandering groove 1901, and the moving sleeve 5 further compresses the third spring 22;

[0076] Step 4: When the second pulley 602 moves to the next inflection point, the trigger rod 6 drives the deflection structure to drive the second valve core 27 to rotate a certain angle, so that the second valve core 27 is connected to the first air inlet pipe 24, and the first valve core 26 is deflected and connected to the second air outlet pipe 14;

[0077] Step 5: After the screen plate assembly 15 returns to the initial height, the trigger rod 6 drives the deflection structure to drive the first valve core 26 and the second valve core 27 to return to the initial position, so as to continue screening.

[0078] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0079] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. Anti-blocking fluidized bed screening structure using reverse blowing, characterized in that: include: A housing (1), wherein a screening chamber (3) is arranged in the housing (1), a screening element is elastically and slidably arranged in the screening chamber (3), and a first valve body assembly and a second valve body assembly are arranged on the screening chamber (3); A switching assembly is arranged in the housing (1), and the switching assembly is connected to the first valve body assembly via a deflection structure. When the screening element descends to a preset height, the screening element cooperates with the switching assembly to drive the deflection structure to move, thereby changing the flow direction of the fluid in the screening chamber (3) and impacting particles blocked on the screening element, so that the blocked particles and the fluid are discharged from the screening chamber (3) through the first valve body assembly; When the screening element returns to its initial position, the flow direction of the fluid in the screening chamber (3) is restored, and the fluid can be screened again.

2. The anti-blocking fluidized bed screening structure using reverse blowing according to claim 1 is characterized in that: A baffle plate (4) is fixedly arranged in the screening chamber (3), and the screening element comprises a screen plate group (15) slidably arranged in the screening chamber (3); a support rod (18) is fixedly arranged on the side of the screen plate group (15) away from the baffle plate (4); a lifting plate (17) is fixedly arranged on one end of the support rod (18) passing through the screening chamber (3), and a first spring (16) is also slidably arranged on the support rod (18); one end of the first spring (16) abuts against the baffle plate (4), and the other end abuts against the bottom wall of the screening chamber (3).

3. The anti-blocking fluidized bed screening structure using reverse blowing according to claim 2 is characterized in that: The switching assembly comprises a trigger structure, a lifting member and a transverse moving member, wherein the lifting member comprises a trigger plate (19) fixedly connected to the lifting plate (17), and a circular groove (1901) is provided on the trigger plate (19).

4. The anti-blocking fluidized bed screening structure using reverse blowing according to claim 3 is characterized in that: The trigger structure comprises a movable sleeve (5) slidably arranged in the housing (1) and a trigger rod (6) penetrating the movable sleeve (5) and slidably cooperating with the movable sleeve (5), and a first pulley (502) is arranged on the movable sleeve (5), and the first pulley (502) cooperates with the transverse moving member; A blocking piece (601) is formed on the trigger rod (6), and a second spring (21) and a third spring (22) are slidably arranged at both ends of the blocking piece (601), one end of the second spring (21) abuts against the blocking piece (601), and the other end abuts against the inner wall of the port at one end of the movable sleeve (5), and one end of the third spring (22) abuts against the blocking piece (601), and the other end abuts against the inner wall of the port at the other end of the movable sleeve (5); A second pulley (602) is provided at one end of the trigger rod (6), and the second pulley (602) is slidably arranged in the circular groove (1901), and the other end of the trigger rod (6) is connected to the deflection structure.

5. The anti-blocking fluidized bed screening structure using reverse blowing according to claim 4 is characterized in that: The transverse moving member comprises a moving plate (20) fixedly connected to the lifting plate (17), an inclined groove (2001) is provided on the moving plate (20), and the first pulley (502) is arranged in the inclined groove (2001).

6. The anti-blocking fluidized bed screening structure using reverse blowing according to claim 4, characterized in that: The deflection structure comprises a connecting rod (7) fixedly connected to the trigger rod (6), and a toothed plate (8) is fixedly provided on one end of the connecting rod (7) away from the trigger rod (6).

7. The anti-blocking fluidized bed screening structure using reverse blowing according to claim 6, characterized in that: The first valve body assembly comprises a second ball valve (12) rotatably mounted in the housing (1); the second ball valve (12) is connected to the interior of the screening chamber (3) via a first air inlet pipe (24) and a second air inlet pipe (23), respectively; a second valve core (27) is sealably rotatably mounted in the second ball valve (12); a gear (801) meshing with the toothed plate (8) is coaxially fixedly disposed on the valve shaft of the second valve core (27).

8. The anti-blocking fluidized bed screening structure using reverse blowing according to claim 7, characterized in that: The second valve body assembly comprises a first ball valve (11) rotatably mounted in the housing (1); the first ball valve (11) is connected to the interior of the screening chamber (3) via a first air outlet pipe (25) and a second air outlet pipe (14), respectively; a first valve core (26) is sealably rotatably mounted in the first ball valve (11); the valve shaft of the first valve core (26) is connected to the valve shaft of the second valve core (27) via a linkage belt (10).

9. A method for anti-clogging fluidized bed screening using reverse blowing, using the anti-clogging fluidized bed screening structure using reverse blowing as described in claim 1, characterized in that: The steps include: Step 1: Check the first ball valve (11) and the second ball valve (12) to ensure that the second valve core (27) is in communication with the second air inlet pipe (23), and the first valve core (26) is in communication with the first air outlet pipe (25). At this time, the second pulley (602) is located at the inflection point of the round-shaped groove (1901); Step 2: wet material is introduced into the screening chamber (3) through the feed port (202), and hot air is introduced into the screening chamber (3) through the first air inlet pipe (24). The hot air passes through the sieve plate group (15), passes through the first air outlet pipe (25), and is finally discharged through the air outlet (203); Step 3: After a long period of screening, the agglomerated materials due to static electricity, humidity and / or temperature will be blocked in the sieve holes of the sieve plate group (15), forcing the sieve plate group (15) to descend. During the descent, the second pulley (602) slides along the meandering groove (1901) to the next turning point of the meandering groove (1901), and the moving sleeve (5) will further compress the third spring (22); Step 4: When the second pulley (602) moves to the next inflection point, the trigger rod (6) drives the deflection structure to drive the second valve core (27) to rotate a certain angle, so that the second valve core (27) is connected to the first air inlet pipe (24), and at the same time, the first valve core (26) is deflected and connected to the second air outlet pipe (14); Step 5: After the screen plate assembly (15) returns to its initial height, the trigger rod (6) drives the deflection structure to drive the first valve core (26) and the second valve core (27) to return to their initial positions, thereby continuing screening.

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