Pre-dewatering screen device, control method and granule drying system

Abstract

According to the pre-dewatering screen device, a particle water channel is formed in a device body, a particle water input pipeline is arranged above the particle water channel, a screen with the adjustable gradient is arranged between the particle water channel and the particle water input pipeline, and an automatic valve plate capable of being isolated and sliding is arranged on the screen; one end of the screen is connected with a particle water input pipeline, the other end of the screen is connected with a large material channel, a secondary screening mechanism is arranged in the large material channel, the large material channel is connected with a fine material discharge pipe, a water volume detection device is arranged on the inner side of a box body of the large material channel, and a first liquid level detection element is arranged on the side, facing the particle water input pipeline, of the automatic valve plate. A second liquid level detection element is arranged on the side, facing the screen, of the secondary screening mechanism, the screen, the automatic valve plate and the secondary screening mechanism are controlled according to the detection conditions of all detection devices, blocky materials and strip-shaped materials generated in the production process can be effectively separated, automation and precision of operation are ensured, manual intervention is reduced, and the production efficiency is improved. The production efficiency, the safety and the reliability are improved, and the equipment failure rate is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of polymer material production, and in particular to a pre-dehydration screen device, a control method and a pellet drying system. Background Art

[0002] The pellet drying system of the polypropylene device is an auxiliary unit of the extrusion granulation unit. The pellet drying system mainly consists of a pre-dehydration screen device and a desiccant. The pre-dehydration screen device is mainly used to remove strip materials and large blocks during start-up and to recycle most of the pelletizing water to the system for continued use. However, the pre-dehydration screen device in the prior art has always had problems such as pellet leakage and mixing of extremely small pellets, and requires real-time operation by technicians, which is very inconvenient. Summary of the invention

[0003] The purpose of the present application is to overcome at least one shortcoming in the prior art and to provide a pre-dewatering screen device, a control method and a pellet drying system.

[0004] The technical solution of the present application provides a pre-dewatering screen device, comprising a control mechanism, a device body having a particle water channel, a particle water input pipe connected to the device body and located above the particle water channel, a screen connected to the particle water input pipe and located above the particle water channel, a large block material channel connected to one side of the screen, and a large block material outlet communicated with the large block material channel;

[0005] A secondary screening mechanism capable of isolating the large block material channel is provided in the large block material channel, and the secondary screening mechanism includes a fine material discharge pipe;

[0006] The screen comprises a screen body having a screening space, a slope adjustment mechanism for adjusting the slope of the screen body, and an automatic valve plate for isolating the screening space;

[0007] The slope adjustment mechanism is connected between the screen body and the inlet of the particle water input pipe;

[0008] The automatic valve plate is connected to the device body via a first sliding mechanism;

[0009] The bulk material channel is provided with a water level detection device, the automatic valve plate is provided with a first liquid level detection element, and the secondary screening mechanism is provided with a second liquid level detection element;

[0010] The secondary screening mechanism, the slope adjustment mechanism, the automatic valve plate, the first sliding mechanism, the water volume detection device, the first liquid level detection element and the second liquid level detection element are respectively connected to the control mechanism signal.

[0011] Further, the secondary screening mechanism comprises an automatic baffle disposed between the bulk material channel and the screen, and the second liquid level detection element is disposed on a side of the automatic baffle facing the screen;

[0012] The automatic baffle is electrically connected to the control mechanism.

[0013] Furthermore, the secondary screening mechanism further comprises an automatic bottom plate closably arranged inside the large block material channel and an automatic screen plate arranged above the automatic bottom plate;

[0014] When the automatic bottom plate is closed, the large block material channel is isolated, and a fine material screening space is formed between the inner wall of the large block material channel, the automatic bottom plate and the automatic baffle;

[0015] The fine material screening space is connected to the fine material discharge pipe, a fan is arranged in the fine material screening space toward the fine material discharge pipe, and the automatic bottom plate, the automatic screen plate and the fan are electrically connected to the control mechanism respectively.

[0016] Further, the first sliding mechanism comprises a first sliding rail arranged on the inner wall of the device body and a first sliding member sliding on the first sliding rail;

[0017] The first slide rail is arranged along the length direction of the screen body, and the first sliding member is arranged on the upper end of the automatic valve plate.

[0018] Further, it also includes a screen sweeping mechanism;

[0019] The screen cleaning mechanism comprises a second slide rail arranged below the screen body, a second sliding member sliding on the second slide rail, and a cleaning frame connected to the second sliding member and abutting against the bottom of the screen body;

[0020] The sweeping frame comprises a sweeping rod and a sweeping member arranged on the sweeping rod, and the sweeping member is adapted to the sieve holes of the sieve body;

[0021] The second sliding member is electrically connected to the control mechanism.

[0022] Furthermore, the screen also includes an extension section arranged at one end of the screen body facing the large block material channel;

[0023] The extension section is provided at one end of the screen body facing the large block material channel, and the extension section includes an extended screen and at least one second connecting rod vertically extending from at least one side of the extended screen, and the extended end of the second connecting rod is rotatably connected to the screen body;

[0024] The second connecting rod is electrically connected to the control mechanism.

[0025] Furthermore, a bypass water pipeline () is connected between the inlet of the particle water channel and the particle water input pipeline, and the bypass water pipeline () is provided with a bypass screen.

[0026] Furthermore, a sealing strip is provided at the bottom of the automatic valve plate.

[0027] The technical solution of the present application also provides a control method for a pre-dewatering screen device, comprising the following steps: when the liquid level detected by the first liquid level detection element is greater than a first preset liquid level, closing the secondary screening mechanism and opening the automatic valve plate;

[0028] When the liquid level detected by the second liquid level detection element is greater than a second preset liquid level and lasts for a first preset time, opening the secondary screening mechanism;

[0029] When the liquid level detected by the second liquid level detection element is lower than a third preset liquid level and lasts for a second preset time, opening the secondary screening mechanism;

[0030] The second preset liquid level is greater than the third preset liquid level; when the water volume detected by the water volume detection device is greater than the first preset water volume, the slope of the screen body is reduced and the automatic valve plate is adjusted toward the direction of the large block material channel by a preset distance;

[0031] When the water volume detected by the water volume detection device is less than the second preset water volume and lasts for a third preset time, the slope of the screen body is increased and the automatic valve plate is adjusted a preset distance away from the direction of the bulk material channel.

[0032] The technical solution of the present application also provides a pellet drying system, including a pelletizing water chamber, a dryer, a waste chamber and a pre-dewatering screen device;

[0033] The pre-dewatering screen device also includes a first output end for discharging water and a second output end for discharging small particles;

[0034] The output end of the pelletizing water chamber is connected to the pellet water input pipeline, the input end of the pelletizing water chamber is respectively connected to the first output end of the pre-dewatering screen device and the bulk material outlet, the dryer is connected to the second output end of the pre-dewatering screen device, and the waste chamber is connected to the fine material discharge pipe.

[0035] After adopting the above technical solution, the following beneficial effects are achieved:

[0036] The present application discloses a pre-dewatering screen device, which comprises a particle water channel arranged inside the device body, a particle water input pipe arranged above the particle water channel, and a screen with adjustable slope arranged between the particle water channel and the particle water input pipe, an isolable and slidable automatic valve plate arranged on the screen, one end of the screen is connected to the particle water input pipe, and the other end is connected to the bulk material channel, a secondary screening mechanism is arranged in the bulk material channel, and is connected to a fine material discharge pipe, a water volume detection device is arranged inside the bulk material channel box, a first liquid level detection element is arranged on a side of the automatic valve plate facing the particle water input pipe, and a second liquid level detection element is arranged on a side of the secondary screening mechanism facing the screen, and the screen, the automatic valve plate and the secondary screening mechanism are controlled according to the detection conditions of each detection device, so as to effectively separate the block materials and strip materials generated in the production process, ensure the automation and precision of the operation, reduce manual intervention, improve the production efficiency, safety and reliability, and reduce the equipment failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The disclosure of this application will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of this application. In the drawings:

[0038] Figure 1 It is a schematic structural diagram of a pre-dewatering screen device in one embodiment of the present application;

[0039] Figure 2 It is a structural schematic diagram of a secondary screening mechanism in a preferred embodiment of the present application;

[0040] Figure 3 is a cross-sectional view of a screen in another preferred embodiment of the present application;

[0041] Figure 4 is a front view of a screen and a screen cleaning mechanism in one embodiment of the present application;

[0042] Figure 5 It is a structural schematic diagram of a screen cleaning mechanism in one embodiment of the present application;

[0043] Figure 6 is a cross-sectional view of an extended section in an embodiment of the present application without expansion;

[0044] Figure 7 is a cross-sectional view of an extended section in an embodiment of the present application;

[0045] Figure 8 It is a schematic diagram of the hardware structure of a pellet drying system in one embodiment of the present application.

[0046] Reference table of reference numerals:

[0047] Pre-dewatering screen device 1:

[0048] Granular water channel 01, device body 02, granular water input pipeline 03;

[0049] Screen 04: screen body 41, slope adjustment mechanism 42, automatic valve plate 43, first liquid level detection element 44, extension section 45, extension screen 451, second connecting rod 452, sealing strip 46;

[0050] Large block material channel 05: large block material outlet 51;

[0051] Secondary screening mechanism 06: fine material discharge pipe 61, second liquid level detection element 62, automatic baffle 63, automatic bottom plate 64, automatic screen plate 65, fine material screening space 66, fan 67;

[0052] The first sliding mechanism 07: a first sliding rail 71 and a first sliding member 72;

[0053] Screen cleaning mechanism 08: second slide rail 81, second sliding member 82, cleaning frame 83, cleaning rod 831, cleaning member 832;

[0054] Bypass water pipeline 09: bypass screen 91;

[0055] Pelletizing water chamber 2, dryer 3, waste chamber 4. DETAILED DESCRIPTION

[0056] The specific implementation of the present application is further described below with reference to the accompanying drawings.

[0057] It is easy to understand that according to the technical solution of the present application, without changing the essential spirit of the present application, a variety of structural modes and implementation modes that can be replaced by those skilled in the art can be replaced with each other. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present application, and should not be regarded as the entirety of the present application or as a limitation or restriction on the technical solution of the application.

[0058] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to their different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0059] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above-mentioned in this application can be understood according to the specific circumstances.

[0060] A pre-dewatering screen device in the embodiment of the present application, such as Figure 1-3 As shown, it includes a control mechanism, a device body 02 having a granular water channel 01, a granular water input pipe 03 connected to the device body 02 and located above the granular water channel 01, a screen 04 connected to the granular water input pipe 03 and located above the granular water channel 01, a large block material channel 05 connected to one side of the screen 04, and a large block material outlet 51 connected to the large block material channel 05.

[0061] A secondary screening mechanism 06 capable of isolating the large-block material channel 05 is disposed in the large-block material channel 05 , and the secondary screening mechanism 06 includes a fine-block material discharge pipe 61 .

[0062] The screen 04 includes a screen body 41 having a screening space, a slope adjustment mechanism 42 for adjusting the slope of the screen body 41, and an automatic valve plate 43 for isolating the screening space.

[0063] The slope adjustment mechanism 42 is connected between the screen body 41 and the inlet of the particle water input pipe 03 .

[0064] The automatic valve plate 43 is connected to the device body 02 via a first sliding mechanism 07 .

[0065] The bulk material channel 05 is provided with a water level detection device, the automatic valve plate 43 is provided with a first liquid level detection element 44 , and the secondary screening mechanism 06 is provided with a second liquid level detection element 62 .

[0066] The secondary screening mechanism 06, the slope adjustment mechanism 42, the automatic valve plate 43, the first sliding mechanism 07, the water volume detection device, the first liquid level detection element 44 and the second liquid level detection element 62 are respectively connected to the control mechanism signal.

[0067] In this embodiment, a particle water channel 01 for small particles to flow is provided inside the device body 02, a particle water input pipe 03 connected to the device body 02 is provided above the particle water channel 01, and a screen 04 is provided between the particle water channel 01 and the particle water input pipe 03, wherein one side of the screen 04 is connected to the particle water input pipe 03, and the other side is connected to the large block material channel 05, and the large block material channel 05 is also provided with a large block material outlet 51 connected thereto.

[0068] Specifically, the granular water input pipe 03 is set higher than the large block material channel 05, and the screen body 41 is set at an angle. After the granular water in the granular water input pipe 03 enters the device body 02, part of the water and small particles flow to the granular water channel 01 through the screen body 41, and a small part of the large block materials cannot pass through the screen body 41, but enter the large block material channel 05, and flow out of the device body 02 from the large block material outlet 51.

[0069] A secondary screening mechanism 06 that can isolate itself is arranged inside the bulk material channel 05, and the secondary screening mechanism 06 also includes a fine material discharge pipe 61. When the secondary screening mechanism 06 closes the bulk material channel 05, the bulk material and extremely small particles mixed therein will be screened again, the extremely small particles will be screened out, and discharged through the fine material discharge pipe 61, thereby realizing the separation of particles of different particle sizes and improving the efficiency and accuracy of particle processing.

[0070] The screen 04 includes a screen body 41, a slope adjustment mechanism 42 and an automatic valve plate 43. The slope adjustment mechanism 42 is arranged on the side of the screen body 41 facing the particle water input pipe 03, and is pivotally connected to the particle water input pipe 03. That is to say, the slope adjustment mechanism 42 can adjust the slope of the screen body 41, which can allow technicians to adjust the inclination slope of the screen 04 according to the characteristics of the granular material or working conditions, thereby optimizing the screening effect and improving the screening efficiency.

[0071] The screen body 41 has a screening space, and the automatic valve plate 43 is used to isolate the screening space, wherein a first sliding mechanism 07 is provided at the upper end of the automatic valve plate 43, and the first sliding mechanism 07 can be slidably arranged on the top of the inner wall of the device body 02, and the automatic valve plate 43 can slide above the screen body 41 through the first sliding mechanism 07.

[0072] Specifically, an automatic valve plate 43 is provided on the screen body 41 to isolate the screen body 41. When the automatic valve plate 43 is closed, part of the particle water can be isolated so that it remains in the screening space on the screen body 41 to continue to be screened. A storage area for storing particle water is formed between the automatic valve plate 43 and the screen body 41, so that the particle water and most of the small particles can enter the particle water channel 01 through the screen body 41 at the storage area.

[0073] A water quantity detection device is arranged inside the bulk material channel 05, a first liquid level detection element 44 is arranged on the side of the automatic valve plate 43 facing the particle water input pipeline 03, and a second liquid level detection element 62 is arranged on the side of the secondary screening mechanism 06 facing the screen 04, and the water quantity detection device, the first liquid level detection element 44 and the second liquid level detection element 62 are respectively connected to the control mechanism signal.

[0074] The secondary screening mechanism 06, the slope adjustment mechanism 42, and the first sliding mechanism 07 are respectively connected to the control mechanism signal.

[0075] Specifically, the water volume detection device inside the bulk material channel 05 is used to detect the amount of water used to transport the bulk materials. The first liquid level detection element 44 is used to detect the liquid level accumulated at the contact point between the automatic valve plate 43 and the screen body 41 when the automatic valve plate 43 is closed. The second liquid level detection element 62 is used to detect the liquid level accumulated at the contact point between the secondary screening mechanism 06 and the screen body 41 when the secondary screening mechanism 06 is closed. The secondary screening mechanism 06, the slope adjustment mechanism 42 and the first sliding mechanism 07 can be controlled respectively according to the data of the three detection devices.

[0076] In one of the embodiments, when too much large block materials and strip materials accumulate and block the screen body 41, so that the granular water cannot flow down the screen body 41 normally, the automatic valve plate 43 can be moved a short distance toward the large block material channel 05 by controlling the first sliding mechanism 07, so that the granular water can continue to pass through the screen body 41 into the granular water channel 01.

[0077] like Figure 1 and Figure 2 As shown, in another embodiment, the secondary screening mechanism 06 includes an automatic baffle 63 disposed between the large block material channel 05 and the screen 04 , and a second liquid level detection element 62 is disposed on the side of the automatic baffle 63 facing the screen 04 .

[0078] The automatic baffle 63 is electrically connected to the control mechanism.

[0079] In this embodiment, the secondary screening mechanism 06 includes an automatic baffle 63, which is arranged at the entrance of the large block material channel 05 and connected to the screen 04, and is used to isolate the screen 04 from the large block material channel 05. In addition, a second liquid level detection element 62 is also provided on the side of the automatic baffle 63 facing the screen 04, which is used to detect the liquid level accumulated at the entrance of the large block material channel 05 when the automatic baffle 63 is closed.

[0080] Specifically, when the first liquid level detection element 44 detects that the liquid level is too high, it means that the water flow is large / large blocks of material are blocking the screen body 41. When the automatic valve plate 43 is closed, too much water accumulates toward the side of the particle water input pipe 03. At this time, the automatic baffle 63 can be closed and the automatic valve plate 43 can be opened, so that the particle water can continue to flow through the screening space and be blocked by the automatic baffle 63 from entering the large block material channel 05, so that small particles can continue to pass through the screen body 41 in the screening space and enter the particle water channel 01, and the automatic valve plate 43 continues to be closed. When the liquid level of the second liquid level detection element 62 is lower than the preset value, the automatic baffle 63 can be opened, so that large blocks of material can enter the large block material channel 05, thereby avoiding a large number of small particles following the large blocks into the large block material channel 05, thereby improving the efficiency and accuracy of particle material processing.

[0081] like Figure 1 and Figure 2 As shown, in another preferred embodiment, the secondary screening mechanism 06 further includes an automatic bottom plate 64 closably disposed inside the large block material channel 05 and an automatic screening plate 65 disposed above the automatic bottom plate 64 .

[0082] When the automatic bottom plate 64 is closed, the large block material channel 05 is isolated, and a fine material screening space 66 is formed between the inner wall of the large block material channel 05, the automatic bottom plate 64 and the automatic baffle 63.

[0083] The fine material screening space 66 is connected to a fine material discharge pipe 61 , a fan 67 is provided in the fine material screening space 66 toward the fine material discharge pipe 61 , and the automatic bottom plate 64 and the fan 67 are electrically connected to the control mechanism respectively.

[0084] In this preferred embodiment, the secondary screening mechanism 06 also includes an automatic bottom plate 64 and an automatic screen plate 65. The automatic bottom plate 64 and the automatic screen plate 65 are both arranged inside the bulk material channel 05 and electrically connected to the control mechanism to isolate the bulk material channel 05. The automatic screen plate 65 is arranged between the automatic bottom plate 64 and the automatic baffle 63. When the automatic bottom plate 64 and the automatic baffle 63 are closed at the same time, the inner wall of the bulk material channel 05, the automatic bottom plate 64 and the automatic baffle 63 form a fine material screening space 66. The automatic screen plate 65 is used to discharge water and only leave particles in the fine material screening space 66. A fan 67 is arranged inside the fine material screening space 66. The fan 67 is arranged toward the fine material discharge pipe 61 to blow the extremely small particles mixed in the bulk material out of the fine material discharge pipe 61, thereby screening out particles of different particle sizes and improving the screening accuracy and efficiency of the particles.

[0085] Specifically, when the second liquid level detection element 62 on the automatic baffle 63 detects that the liquid level is greater than the second preset liquid level and lasts for a first preset time, it means that the connection between the automatic baffle 63 and the screen 04 is blocked. At this time, the automatic screen plate 65 is controlled to close and the automatic bottom plate 64 is opened, and the state of the automatic valve plate 43 is detected. When the automatic valve plate 43 is closed, the automatic baffle 63 is opened, so that the granular water accumulated at the automatic baffle 63 enters the fine material screening space 66. After the water is screened out by the automatic screen plate 65, the water volume detection The device will detect the amount of screened water, and at this time control the automatic baffle 63 to close, the automatic bottom plate 64 to close, and the automatic screen plate 65 to open, so that the granular material enters the automatic bottom plate 64, thereby forming a fine material screening space 66 that is sealed up and down. The fan 67 is turned on to screen the granular material in the fine material screening space 66, so that the extremely small granular material mixed between the large bulk materials can be blown and enter the fine material discharge pipe 61. The fan 67 will be turned on for a period of time and then turned off, and the automatic bottom plate 64 will be reopened to allow the large bulk materials to flow out of the large bulk material outlet 51.

[0086] When the second liquid level detection element 62 on the automatic baffle 63 detects that the liquid level is less than the third preset liquid level and lasts for a second preset time, it means that at this time, the connection between the automatic baffle 63 and the screen body 41 is almost dry, and only granular materials are accumulated on the automatic baffle 63. At this time, the automatic bottom plate 64 is controlled to close and the automatic screen plate 65 is opened, and the state of the automatic valve plate 43 is detected. When the automatic valve plate 43 is closed, the automatic baffle 63 is opened to allow the granular materials accumulated at the automatic baffle 63 to enter the fine material screening space 66, and then the automatic baffle 63 is closed to form a fine material screening space 66 that is sealed up and down. The fan 67 is turned on to screen the granular materials in the fine material screening space 66, so that the extremely small granular materials mixed between the large bulk materials can be blown and enter the fine material discharge pipe 61. The fan 67 will be turned off after a period of time, and the automatic bottom plate 64 will be reopened to allow the large bulk materials to flow out of the large bulk material outlet 51.

[0087] like Figure 3 As shown, in another preferred embodiment, the first sliding mechanism 07 includes a first sliding rail 71 provided on the inner wall of the device body 02 and a first sliding member 72 sliding on the first sliding rail 71 .

[0088] The first slide rail 71 is arranged along the length direction of the screen body 41 , and a first sliding member 72 is arranged at the upper end of the automatic valve plate 43 .

[0089] In this preferred embodiment, the first sliding mechanism 07 arranged at the upper end of the automatic valve plate 43 includes a first sliding rail 71 and a first sliding member 72 sliding on the first sliding rail 71, wherein the first sliding rail 71 is fixedly arranged at the top end of the inner wall of the device body 02 and is arranged along the length direction of the screen body 41, and the first sliding member 72 is fixedly arranged at the upper end of the automatic valve plate 43.

[0090] Specifically, the positional relationship between the automatic valve plate 43 and the screen body 41 can be adjusted by controlling the first sliding mechanism 07. If the first liquid level detection element 44 detects that the liquid level is too high, the automatic valve plate 43 can be adjusted to slide at the top of the inner wall of the device body 02, thereby adjusting the abutment between the automatic valve plate 43 and the screen body 41, changing the accumulation of the particle water, so that small particles in the particle water can enter the particle water channel 01 through the unblocked screen body 41.

[0091] like Figure 4 and Figure 5 As shown, in another embodiment, a screen sweeping mechanism 08 is also included.

[0092] The screen cleaning mechanism 08 includes a second slide rail 81 disposed below the screen body 41 , a second sliding member 82 sliding on the second slide rail 81 , and a cleaning frame 83 connected to the second sliding member 82 and abutting against the bottom of the screen body 41 .

[0093] The sweeping frame 83 includes a sweeping rod 831 and a sweeping member 832 disposed on the sweeping rod 831 . The sweeping member 832 is matched with the sieve holes of the sieve body 41 .

[0094] The second sliding member 82 is electrically connected to the control mechanism.

[0095] In this embodiment, a screen cleaning mechanism 08 is also provided, wherein the screen cleaning mechanism 08 includes a second slide rail 81, a second sliding member 82 sliding on the second slide rail 81, and a cleaning frame 83, wherein the second slide rail 81 is arranged below the screen body 41, and the cleaning frame 83 includes a cleaning rod 831 and a cleaning member 832 arranged on the cleaning rod 831, and the cleaning rod 831 is connected to the second sliding member 82, and the cleaning member 832 abuts against the bottom of the screen body 41 and is adapted to the screen hole of the screen body 41, wherein the second sliding member 82 is electrically connected to the control mechanism.

[0096] Specifically, a slidable screen cleaning mechanism 08 is provided below the screen body 41, wherein the cleaning member 832 is adapted to the screen holes of the screen body 41, wherein the screen holes of the screen body 41 are mostly strip-shaped screen holes, and the cleaning member 832 may be a protrusion slightly smaller than the width of the strip-shaped screen holes, and when the cleaning rod 831 and the cleaning member 832 follow the second sliding member 82 to slide on the second slide rail 81, the cleaning member 832 may extend into the screen holes from below the screen body 41, and push out the strip-shaped materials, large blocks of materials, etc., which are blocked on the screen holes, so that they no longer block the screen holes, thereby ensuring that the screening efficiency is not affected and the flow of granular water is smooth, and realizing the automatic cleaning function, reducing manual labor and improving the portability of operation, and the adaptation design between the cleaning member 832 and the screen holes enables it to adapt to screen holes of different sizes and shapes, thereby enhancing the applicability of the device.

[0097] like Figure 6 and Figure 7 As shown, in another embodiment, the screen 04 further includes an extension section 45 disposed at one end of the screen body 41 facing the large block material channel 05 .

[0098] An extension section 45 is provided at one end of the screen body 41 facing the bulk material channel 05 . The extension section 45 includes an extended screen 451 and at least one second connecting rod 452 extending vertically from at least one side of the extended screen 451 . The extended end of the second connecting rod 452 is rotatably connected to the screen body 41 .

[0099] The second connecting rod 452 is electrically connected to the control mechanism.

[0100] In this embodiment, an extension section 45 is further provided at one end of the screen body 41 facing the bulk material channel 05, and the extension section 45 includes an extension screen 451 and a second connecting rod 452, wherein the extension screen 451 is consistent in width with the screen body 41, at least one second connecting rod 452 vertically extends from at least one side of the extension screen 451, and the extension end of the second connecting rod 452 is rotatably connected to the screen body 41, and the second connecting rod 452 is electrically connected to the control mechanism. When the second liquid level detection element 62 detects liquid After the level is greater than the second preset liquid level and exceeds a first preset time, the secondary screening mechanism 06 can be opened to drain the accumulated water, and by controlling the second connecting rod 452, the extended screen 451 is rotated to one end of the screen body 41, and at the same time, the slope adjustment mechanism 42 is controlled to make the slope of the screen body 41 smaller and the length larger. At this time, the secondary screening mechanism 06 is closed, and the granular water can be accumulated on the extended screen 451, so that small particles can smoothly pass through the sieve holes of the extended screen 451 and enter the granular water channel 01.

[0101] like Figure 1As shown, in another embodiment, a bypass water pipe 09 is connected between the inlet of the particle water channel 01 and the particle water input pipe 03 , and the bypass water pipe 09 is provided with a bypass screen 91 .

[0102] In this embodiment, the inlet of the particle water input pipe 03 is arranged above the particle water channel 01, wherein a bypass water pipe 09 is also connected between the particle water channel 01 and the inlet of the particle water input pipe 03, the bypass water pipe 09 is arranged below the screen body 41, and a bypass screen 91 is arranged in the bypass water pipe 09.

[0103] Specifically, when small particles enter the particle water channel 01 through the screen body 41, part of the water flow in the particle water input pipe 03 will enter the particle water channel 01 through the bypass water pipe 09, thereby driving the small particles to move in the particle water channel 01. The bypass screen 91 will isolate most of the granular materials in the particle water input pipe 03 and only output bypass water to the particle water channel 01, which can effectively reduce the blockage phenomenon in the particle water channel 01 and ensure the transportation stability in the particle water channel 01.

[0104] like Figure 3 As shown, in another embodiment, a sealing strip 46 is provided at the bottom of the automatic valve plate 43 .

[0105] In this embodiment, a sealing strip 46 is further provided at the bottom of the automatic valve plate 43, which is used to prevent particulate water from passing through the bottom of the automatic valve plate 43 when the automatic valve plate 43 is closed. The sealing strip 46 can be a soft sealing strip made of rubber, which can still maintain sealing under the impact of large water flow, and can still play the role of sealing between the automatic valve plate 43 and the screen body 41 as the slope of the screen body 41 changes.

[0106] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0107] The technical solution of the present application also provides a control method for a pre-dewatering screen device, which adopts the pre-dewatering screen device in any of the aforementioned embodiments, and includes the following steps: when the liquid level detected by the first liquid level detection element 44 is greater than the first preset liquid level, the secondary screening mechanism 06 is closed and the automatic valve plate 43 is opened.

[0108] When the liquid level detected by the second liquid level detection element 62 is greater than the second preset liquid level and lasts for a first preset time, the secondary screening mechanism 06 is opened.

[0109] When the liquid level detected by the second liquid level detection element 62 is lower than the third preset liquid level and lasts for a second preset time, the secondary screening mechanism 06 is opened.

[0110] The second preset liquid level is greater than the third preset liquid level. When the water volume detected by the water volume detection device is greater than the first preset water volume, the slope of the screen body 41 is reduced and the automatic valve plate 43 is adjusted toward the direction of the bulk material channel 05 by a preset distance.

[0111] When the water volume detected by the water volume detection device is less than the second preset water volume, the slope of the screen body 41 is increased, and the automatic valve plate 43 is adjusted to a preset distance away from the direction of the bulk material channel 05 .

[0112] In this embodiment, the liquid level detected by the first liquid level detection element 44 is the height of the accumulated liquid when the automatic valve plate 43 abuts against the screen body 41 when the automatic valve plate 43 is closed. If it is greater than the first preset liquid level, it means that the screen body 41 is blocked at this time. At this time, the secondary screening mechanism 06 is closed, and the automatic valve plate 43 is opened to lead the accumulated particulate water to the front of the secondary screening mechanism 06, and continue to screen on the screen body 41, and then the automatic valve plate 43 is closed.

[0113] The liquid level detected by the second liquid level detection element 62 is the liquid level accumulated at the screen body 41 before the secondary screening mechanism 06 when the secondary screening mechanism 06 is closed. If it is greater than the second preset liquid level and lasts for a first preset time, it means that the screen body 41 before the secondary screening mechanism 06 is also blocked. At this time, the secondary screening mechanism 06 is controlled to open so that the granular water can enter the large block material channel 05.

[0114] If the liquid level detected by the second liquid level detection element 62 is lower than the third preset liquid level and lasts for a second preset time, and the second preset time is greater than the first preset time, it means that the screen 04 between the secondary screening mechanisms 06 has not been blocked for a long time, but after a long period of screening, a large amount of large blocks of material may have accumulated in front of the secondary screening mechanism 06. At this time, the secondary screening mechanism 06 is controlled to open so that the large blocks of material can enter the large block channel 05.

[0115] The water volume detection device is arranged in the bulk material channel 05, and is used to detect the amount of water flowing through the bulk material channel 05. That is to say, the water volume detection device can indirectly reflect whether the screen body 41 is blocked. If the water volume detected by the water volume detection device is greater than the first preset water volume, it means that more water flows to the bulk material channel 05 at this time, which is not conducive to the screening of granular materials. Therefore, the slope of the screen body 41 is lowered by adjusting the slope adjustment mechanism 42 to slow down the speed of the particle water flowing into the channel, and at the same time, the automatic valve plate 43 is adjusted to a preset distance in the direction of the bulk material channel 05, so that the automatic valve plate 43 and the storage place of the screen body 41 can be moved downward, so that small particles can continue to pass through the unblocked screen body 41 without being affected by the blockage.

[0116] If the water volume detected by the water volume detection device is less than the second preset water volume and lasts for a third preset time, it means that the connection between the secondary screening mechanism 06 and the screen body 41 is not blocked and lasts for a long period of time. At this time, the slope of the screen 04 is increased by adjusting the slope adjustment mechanism 42 to speed up the flow of granular water, and at the same time, the automatic valve plate 43 is adjusted to a preset distance away from the direction of the large block material channel 05, so that the automatic valve plate 43 and the storage place of the screen body 41 can be moved upward, which can increase the screening speed of the granular material and improve the screening efficiency of the granular material. The screen body 41 and the automatic valve plate 43 of the device can be dynamically adjusted so that the screening efficiency of the granular material is always at the peak value and can adapt to a larger water flow rate and amount of granular material.

[0117] In a preferred embodiment, if the water volume detected by the water volume detection device is greater than the first preset water volume, the screen cleaning mechanism 08 is adjusted to clean the screen holes of the screen body 41, so that long strips of material and large blocks of material no longer block the screen body 41, thereby increasing the screening efficiency and eliminating the need for manual intervention, thereby increasing the intelligence of the device.

[0118] As shown in the figures and the drawings, the technical solution of the present application also provides a pellet drying system, including a pelletizing water chamber 2, a dryer 3, a waste chamber 4 and the pre-dewatering screen device 1 in any of the aforementioned embodiments.

[0119] The pre-dewatering screen device 1 further comprises a first output end for discharging water and a second output end for discharging small particles.

[0120] The output end of the pelletizing water chamber 2 is connected to the pellet water input pipe 03, the input end of the pelletizing water chamber 2 is respectively connected to the first output end of the pre-dehydration screen device 1 and the large block material outlet 51, the dryer 3 is connected to the second output end of the pre-dehydration screen device 1, and the waste chamber 4 is connected to the fine material discharge pipe 61.

[0121] The output end of the pelletizing water chamber 2 is connected to the pelletizing water input pipe 03, and is used to transport pelletizing water with pellets to the pre-dewatering screen device 1, wherein the pre-dewatering screen device 1 also includes a first output end for discharging water and a second output end for discharging small pellets, wherein the first output end is arranged below the second output end, and an auxiliary screen is also arranged between the second output end and the first output end, which is used to screen out small pellets from the pelletizing water.

[0122] The first output end and the bulk material outlet 51 are also respectively connected to the input end of the pelletizing water chamber 2, wherein the bulk material outlet 51 transports mostly bulk materials and strip materials, which re-enter the pelletizing water chamber 2 together with the water discharged from the first output end, and then enter the pre-dewatering screen device 1 through the output end of the pelletizing water chamber 2 after cutting, thereby realizing the recycling of water in the granular water, and repeatedly cutting and utilizing bulk materials and strip materials, significantly reducing the generation of waste materials, improving the utilization efficiency of pellet materials, being more environmentally friendly and realizing a more efficient production process.

[0123] The second output end of the pre-dehydration screen device 1 for discharging small particles is connected to the dryer 3, wherein the dryer 3 also includes a dehumidification fan 67 and a vibrating screen for dehumidifying and removing water from the small particles and further screening operations, which can effectively remove moisture from the small particles and improve the quality of the small particles.

[0124] The secondary screening mechanism 06 arranged inside the large block material channel 05 also includes a fine material discharge pipe 61, which is connected to the waste chamber 4 to ensure that extremely small particles can be screened out by the secondary screening mechanism 06 and processed centrally, thereby further reducing the waste generated in the production process and extremely small particles mixed between large blocks and small particles, and improving the quality of small particles.

[0125] The above description is only the principle and preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this field, the implementation methods obtained by appropriately combining the technical solutions disclosed in different embodiments are also included in the technical scope of the present invention. On the basis of the principle of the present application, several other variations can be made, which should also be regarded as the protection scope of the present application.

Claims

1. A pre-dewatering screen device, characterized in that: The device comprises a control mechanism, a device body (02) having a particle water channel (01), a particle water input pipe (03) connected to the device body (02) and located above the particle water channel (01), a screen (04) connected to the particle water input pipe (03) and located above the particle water channel (01), a bulk material channel (05) connected to one side of the screen (04), and a bulk material outlet (51) communicating with the bulk material channel (05); A secondary screening mechanism (06) capable of isolating the large-block material channel (05) is arranged in the large-block material channel (05), and the secondary screening mechanism (06) includes a fine material discharge pipe (61); The screen (04) comprises a screen body (41) having a screening space, a slope adjustment mechanism (42) for adjusting the slope of the screen body (41), and an automatic valve plate (43) for isolating the screening space; The slope adjustment mechanism (42) is connected between the screen body (41) and the inlet of the particle water input pipe (03); The automatic valve plate (43) is connected to the device body (02) via a first sliding mechanism (07); The bulk material channel (05) is provided with a water level detection device, the automatic valve plate (43) is provided with a first liquid level detection element (44), and the secondary screening mechanism (06) is provided with a second liquid level detection element (62); The secondary screening mechanism (06), the slope adjustment mechanism (42), the automatic valve plate (43), the first sliding mechanism (07), the water volume detection device, the first liquid level detection element (44) and the second liquid level detection element (62) are respectively connected to the control mechanism signal.

2. A pre-dewatering screen device according to claim 1, characterized in that: The secondary screening mechanism (06) comprises an automatic baffle (63) arranged between the large block material channel (05) and the screen (04), and the second liquid level detection element (62) is arranged on the side of the automatic baffle (63) facing the screen (04); The automatic baffle (63) is electrically connected to the control mechanism.

3. A pre-dewatering screen device according to claim 2, characterized in that: The secondary screening mechanism (06) further comprises an automatic bottom plate (64) closably arranged inside the bulk material channel (05) and an automatic screening plate (65) arranged above the automatic bottom plate (64); When the automatic bottom plate (64) is closed, the large block material channel (05) is isolated, and a fine material screening space (66) is formed between the inner wall of the large block material channel (05), the automatic bottom plate (64) and the automatic baffle (63); The fine material screening space (66) is connected to the fine material discharge pipe (61), a fan (67) is arranged in the fine material screening space (66) toward the fine material discharge pipe (61), and the automatic bottom plate (64), the automatic screen plate (65) and the fan (67) are respectively electrically connected to the control mechanism.

4. A pre-dewatering screen device according to claim 1, characterized in that: The first sliding mechanism (07) comprises a first sliding rail (71) arranged on the inner wall of the device body (02) and a first sliding member (72) sliding on the first sliding rail (71); The first slide rail (71) is arranged along the length direction of the screen body (41), and the first sliding member (72) is arranged at the upper end of the automatic valve plate (43).

5. A pre-dewatering screen device according to claim 1, characterized in that: Also includes a screen sweeping mechanism (08); The screen cleaning mechanism (08) comprises a second slide rail (81) arranged below the screen body (41), a second sliding member (82) sliding on the second slide rail (81), and a cleaning frame (83) connected to the second sliding member (82) and abutting against the bottom of the screen body (41); The sweeping frame (83) comprises a sweeping rod (831) and a sweeping member (832) arranged on the sweeping rod (831), wherein the sweeping member (832) is adapted to the sieve holes of the sieve body (41); The second sliding member (82) is electrically connected to the control mechanism.

6. A pre-dewatering screen device according to claim 1, characterized in that: The screen (04) further comprises an extension section (45) arranged at one end of the screen body (41) facing the large block material channel (05); The extension section (45) is provided at one end of the screen body (41) facing the large block material channel (05), and the extension section (45) includes an extension screen (451) and at least one second connecting rod (452) vertically extending from at least one side of the extension screen (451), and the extension end of the second connecting rod (452) is rotatably connected to the screen body (41); The second connecting rod (452) is electrically connected to the control mechanism.

7. A pre-dewatering screen device according to claim 1, characterized in that: A bypass water pipeline (09) is connected between the inlet of the particle water channel (01) and the particle water input pipeline (03), and the bypass water pipeline (09) is provided with a bypass screen (91).

8. A pre-dewatering screen device according to claim 1, characterized in that: A sealing strip (46) is provided at the bottom of the automatic valve plate (43).

9. A control method for a pre-dewatering screen device according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: when the liquid level detected by the first liquid level detection element (44) is greater than a first preset liquid level, closing the secondary screening mechanism (06) and opening the automatic valve plate (43); When the liquid level detected by the second liquid level detection element (62) is greater than a second preset liquid level and lasts for a first preset time, opening the secondary screening mechanism (06); When the liquid level detected by the second liquid level detection element (62) is lower than a third preset liquid level and lasts for a second preset time, opening the secondary screening mechanism (06); The second preset liquid level is greater than the third preset liquid level; when the water volume detected by the water volume detection device is greater than the first preset water volume, the slope of the screen body (41) is reduced and the automatic valve plate (43) is adjusted by a preset distance in the direction of the large block material channel (05); When the water volume detected by the water volume detection device is less than the second preset water volume and lasts for a third preset time, the slope of the screen body (41) is increased and the automatic valve plate (43) is adjusted by a preset distance in the direction away from the bulk material channel (05).

10. A pellet drying system, comprising a pelletizing water chamber (2), a dryer (3) and a waste chamber (4), characterized in that: Comprising a pre-dewatering screen device (1) as claimed in any one of claims 1 to 8; The pre-dewatering screen device (1) further comprises a first output end for discharging water and a second output end for discharging small particles; The output end of the pelletizing water chamber (2) is connected to the pelletizing water input pipe (03), the input end of the pelletizing water chamber (2) is respectively connected to the first output end of the pre-dewatering screen device (1) and the bulk material outlet (51), the dryer (3) is connected to the second output end of the pre-dewatering screen device (1), and the waste chamber (4) is connected to the fine material discharge pipe (61).

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