Box-type filter suitable for polyethylene resin production

Abstract

The utility model relates to the technical field of polyethylene granule production, in particular to a box-type filter suitable for polyethylene resin production, which comprises a box body and a filter plate, the upper end face of the box body is inclined in a left-high right-low shape, and a baffle is fixedly mounted on the inner side of the right part of the box body in a sealing manner. The device is reasonable and compact in structure and convenient to use, the water content in floating foam impurities is greatly reduced, the cyclic utilization rate of cooling water is effectively improved, the waste of water resources is reduced, and the production cost of resin particles is reduced through the filter plate which is obliquely arranged and adjustable in inclination angle; the cleanliness of the filtered cooling water is greatly improved, the content of floating foam impurities in the water is greatly reduced, and the circulating cooling water in a production system is cleaner, so that the switching frequency of the cooling water filter is reduced, meanwhile, the risk of interlocking shutdown due to low cooling water flow in the cooling water filter switching process of an extruder is reduced, and the service life of the extruder is prolonged. The scaling speed of the cooler is effectively slowed down, and the maintenance cost of the sewage pump is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to polyethylene granule production technical field, it is a kind of box filter suitable for polyethylene resin production. BACKGROUND

[0002] In the production process of polyethylene resin granules, circulating water tank needs to introduce cooling water (desalted water) from outside, when cooling water reaches a certain liquid level, low-pressure steam heats the cooling water to the temperature required by production process. During normal production, the cooling water flowing out from the lower part of the circulating water tank is first pressurized by a water pump, then the impurities are filtered out through a cooling water filter, and then the cooling water is transported to a cooler through a pipeline for cooling the resin granules extruded from a die plate and cut into a certain specification by a cutter, so that the resin granules are solidified; finally, the cooling water carrying the resin granules enters a dehydrator to remove most of the water, and the resin granules after water removal are sent to a deblocking device and a centrifugal dryer, and in the deblocking device and the centrifugal dryer, the residual water in the resin granules is completely separated from the resin granules; the cooling water separated by the dehydrator, the residual water separated by the deblocking device and the centrifugal dryer are then recombined into the circulating water tank for recycling.

[0003] Due to the friction between the resin granules and the pipeline and the friction between the resin granules, dust is generated, and during the cutting process of the extruder cutter, small debris is also generated, and after the molten resin enters the cooling water system, the additives on the surface of the resin are precipitated and peeled off in the water, which also forms precipitates, so the cooling water separated from the dehydrator, the deblocking device and the centrifugal dryer will form granular water due to the carrying of resin granule debris and additive precipitates. When the granular water returns to the circulating water tank, the resin granule debris and additive precipitates form scum at the top of the circulating water tank. Currently, the scum is washed out of the circulating water tank by the overflow of the cooling water, and then discharged into a production sewage tank, and finally sent to a sewage treatment station for centralized treatment. In order to overflow the scum, the circulating water tank will lose a large amount of cooling water, and the remaining cooling water is not enough to meet the production needs of the resin granules, and separate cooling water needs to be supplemented to make up the cooling water required for production. In addition, in order to maintain stable production of the device, ensure product quality and performance and maintain relevant production parameters, it is necessary to remove as much scum impurity content as possible from the circulating water tank.

[0004] The Chinese patent document with publication number CN222889535U discloses a filtering treatment device for emulsion recovery, which includes a treatment box, a filter plate arranged in the treatment box, a water outlet pipe at the bottom of the treatment box, and an impurity accumulation area formed at the lowest position of the filter plate. A sedimentation tank is connected to the lowest position of the treatment box through a first communication pipe, and a first valve is arranged on the first communication pipe. A first water inlet is arranged on the treatment box at the lowest position to flush the impurities in the impurity accumulation area into the sedimentation tank. The first water inlet and the first communication pipe are arranged on the two box walls of the treatment box. A cleaning mechanism is arranged above the filter plate of the treatment box, which includes a cleaning brush and a moving mechanism for driving the cleaning brush to move parallel to the inclined direction of the filter plate to sweep the metal scraps on the filter plate to the impurity accumulation area. The cleaning mechanism also includes a rotating mechanism for driving the cleaning brush to rotate. The device does not need manual cleaning, and is suitable for any material metal scraps, with a wide application range.

[0005] The Chinese patent document with publication number CN217490059U discloses a metallurgical wastewater filtering device, which comprises a filtering tank, a preliminary filtering assembly, a separate filtering assembly and a waste tank. The filtering tank is provided with a water inlet pipe. The preliminary filtering assembly is arranged above the filtering tank. The preliminary filtering assembly comprises a primary filter plate, a scraper, a cover plate, a screw rod, a sliding rod and a driving motor. The filtering tank is provided with a support plate. The screw rod is rotatably arranged on the support plate. The sliding rod is arranged on the support plate. The sliding rod and the screw rod are parallel. The driving motor is arranged on the filtering tank. The output end of the driving motor is arranged on the screw rod. The cover plate is slidably arranged on the filtering tank. The device gradually filters wastewater through multiple filtering forms, avoids blockage, separates solid and liquid in wastewater, removes and collects solid waste during the filtering process, and improves the process and efficiency of the metallurgical wastewater filtering device.

[0006] Therefore, the existing method for removing floating matter in particle-containing water has the following disadvantages in actual use: In the production process of polyethylene resin particles, a large amount of cooling water is discharged together with the floating matter into a production wastewater tank, a large amount of cooling water needs to be supplemented from the outside, water resources are wasted seriously, and the production cost of resin particles is greatly increased. SUMMARY

[0007] The utility model provides a box -type filter suitable for polyethylene resin production has overcome the above -mentioned prior art deficiency, it can effectively solve the existing polyethylene resin particle production in a large amount of cooling water is discharged together with the floating matter into a production wastewater tank, a large amount of cooling water needs to be supplemented from the outside, water resources are wasted seriously, and the production cost is high Problem.

[0008] The technical scheme of the utility model is realized through the following measures: a box filter suitable for polyethylene resin production, including box and filter plate, the upper end of the box is left high right low oblique, the right part of the box is sealed and fixedly installed with baffle on the inner side, the baffle separates the middle and left part of the box into cooling water recovery box, and separates the right part of the box into floating foam collection box; the bottom of the cooling water recovery box is equipped with water outlet which is through from top to bottom; the cooling water recovery box is equipped with filter plate which is left high right low oblique, the right end of the filter plate is rotatably installed with the upper end of the baffle; the left part of the filter plate is equipped with high angle adjusting mechanism between the box, which is used for adjusting the oblique angle of the filter plate according to the production load of resin particles and the water supplement of cooling water; the left side plate of the box is left convex arc, the arc of the arc shape is matched with the rotating track of the left end of the filter plate; the right end of the filter plate can form floating foam impurity gathering area on the upside, and the floating foam gathering area is communicated with the upper part of the floating foam collection box.

[0009] The following is the further optimization or / and improvement of the above-mentioned utility model technical scheme:

[0010] The above-mentioned high angle adjusting mechanism can include rotating shaft, limiting part, front connecting rod support part and rear connecting rod support part, the left part of the box is equipped with adjusting hole which is through from front to back, the rotating shaft is rotatably installed in the adjusting hole, the rear part of the rotating shaft is out of the box, the limiting part which can fix the rotating shaft is arranged between the rear part of the rotating shaft and the rear side of the box; the front connecting rod support part and the rear connecting rod support part are fixedly installed on the rotating shaft in the box, the upper end of the front connecting rod support part and the upper end of the rear connecting rod support part are connected with the corresponding position of the lower side of the left part of the filter plate; the rear connecting rod support part can include first connecting rod, second connecting rod and third connecting rod, the lower end of the first connecting rod is fixedly installed with the rear part of the rotating shaft, the upper end of the first connecting rod is hinged with the right end of the second connecting rod, the left end of the second connecting rod is hinged with the lower end of the third connecting rod, the upper end of the third connecting rod is perpendicularly fixedly installed on the corresponding position of the lower side of the left part of the filter plate; the structure of the front connecting rod support part and the rear connecting rod support part is same and is front-back symmetrical distribution.

[0011] The above-mentioned limiting part can be fastening nut which is connected with the rear part of the rotating shaft through thread, the front end of the fastening nut is abutted with the rear side of the box after being tightened.

[0012] The rear end of the above-mentioned rotating shaft can be equipped with rotating handle.

[0013] The above-mentioned filter plate can include low filter plate and high filter plate which are all left high right low oblique, the right end of the low filter plate is rotatably installed with the upper end of the baffle, the left end of the low filter plate is rotatably installed with the right end of the high filter plate, the oblique angle of the low filter plate is less than the oblique angle of the high filter plate; the left part of the high filter plate is connected with the box through high angle adjusting mechanism, the left part of the low filter plate is equipped with low angle adjusting mechanism which can independently adjust the oblique angle of the low filter plate.

[0014] The upper end of the left side plate of the box body is hingedly connected with a first box cover, the upper end of the rear side plate of the box body corresponding to the right side position of the first box cover is hingedly connected with a second box cover, and the first box cover is provided with a water inlet pipe avoiding notch.

[0015] The water outlet is sealingly provided with a water outlet pipe.

[0016] The lower part of the floating foam collecting box is in the shape of a truncated cone or a ladder platform, the lower part of the floating foam collecting box is provided with a discharging port penetrating through the upper and lower parts, and the discharging port is sealingly provided with a discharging pipe.

[0017] The cooling water recovery box corresponding to the left side position of the water outlet is sealingly provided with a first flow guide plate inclined in the shape of left high and right low, and the cooling water recovery box corresponding to the right side position of the water outlet is sealingly provided with a second flow guide plate inclined in the shape of right high and left low.

[0018] The upper end of the baffle is provided with a baffle strip, the upper side of the baffle strip is provided with an insertion slot opening upward, the insertion slot is provided with a buffer baffle, and the upper end of the buffer baffle is lower than the upper end surface of the box body.

[0019] The filter plate comprises an outer frame and a filter screen, the filter screen is detachably installed on the upper side of the outer frame, and the outer side of the outer frame is provided with a sealing strip in the circumferential direction.

[0020] The lower side of the middle part of the box body to the lower side of the left end is provided with a mounting bracket, and the mounting bracket is matched with the circulating water tank.

[0021] The utility model discloses a reasonable and compact structure, convenient to use, which greatly reduces the water content in floating impurities through the filter plate arranged obliquely and the adjustable inclination angle, effectively improves the recycling rate of cooling water, reduces water resource waste, and reduces the production cost of resin particles, the purity of filtered cooling water is greatly improved, and the content of floating impurities in water is greatly reduced, so that the circulating cooling water in the production system is cleaner, thereby reducing the switching frequency of the cooling water filter, reducing the risk of interlock shutdown of the extruder due to low cooling water flow during the switching of the cooling water filter, effectively slowing down the scaling speed of the cooler, reducing the sludge formed by the deposition of floating foam in the production sewage tank, reducing the burden of cleaning the production sewage tank during maintenance, reducing the frequency of sewage pump blockage during sewage delivery, and reducing the maintenance cost of the sewage pump. BRIEF DESCRIPTION OF DRAWINGS

[0022] ATTACHED Figure 1 It is a front view of the sectional structure schematic diagram of the utility model embodiments 1 to 12.

[0023] ATTACHED Figure 2 It is a front view of the sectional structure schematic diagram of the utility model embodiments 1 to 12. Figure 1 It is a front view of the sectional structure schematic diagram of the utility model embodiments 1 to 12.

[0024] ATTACHED Figure 3This is a three-dimensional structural diagram of the usage state of embodiments 1 to 12 of this utility model.

[0025] The codes in the attached diagram are as follows: 1 is the housing, 2 is the cooling water recovery tank, 3 is the foam collection tank, 4 is the rotating shaft, 5 is the first connecting rod, 6 is the second connecting rod, 7 is the third connecting rod, 8 is the fastening nut, 9 is the rotating handle, 10 is the low-level filter plate, 11 is the high-level filter plate, 12 is the first tank cover, 13 is the second tank cover, 14 is the water inlet pipe clearance notch, 15 is the water outlet pipe, 16 is the discharge pipe, 17 is the first guide plate, 18 is the second guide plate, 19 is the baffle, 20 is the buffer baffle, 21 is the outer frame, 22 is the filter screen, 23 is the mounting bracket, 24 is the circulating water tank, and 25 is the particulate water inlet pipe. Detailed Implementation

[0026] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0027] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0028] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0029] Example 1: As shown in the attached document Figure 1 , 2 As shown in Figure 3, the box filter suitable for polyethylene resin production includes a box body 1 and a filter plate. The upper surface of the box body 1 is inclined with the left side higher than the right side. A baffle is sealed and fixedly installed on the inner side of the right side of the box body 1. The baffle divides the middle and left parts of the box body 1 into a cooling water recovery tank 2, and at the same time divides the right part of the box body 1 into a foam collection tank 3. The bottom of the cooling water recovery tank 2 is provided with a water outlet that runs vertically through the bottom. The filter plate is installed in the cooling water recovery tank 2 with the left side higher than the right side. The right end of the filter plate is rotatably installed together with the upper end of the baffle. A high-position tilt angle adjustment mechanism is provided between the left side of the filter plate and the box body 1 to adjust the tilt angle of the filter plate according to the production load of the resin particles and the amount of cooling water replenishment. The left side plate of the box body 1 is an arc shape that bulges to the left. The arc shape is adapted to the rotation trajectory of the left end of the filter plate. A foam impurity accumulation area can be formed on the upper side of the right end of the filter plate. The foam accumulation area is connected to the upper part of the foam collection tank 3.

[0030] In the above technical solution, the water inlet pipe of the particle water is located at a high position above the left part of the filter plate, and the water inlet speed and flow of the particle water are related to the production load of the resin particles and the water supplement of the cooling water; the resin particle debris and additive precipitates in the particle water form floating scum on the filter plate, and the floating scum slides along the high position (upper left part) of the filter plate to the low position (lower right part) of the filter plate under the combined action of the impact of the water flow, mutual pushing of the floating scum, and self-weight, and is gathered in the floating scum impurity gathering area; as the floating scum impurities gather, the floating scum impurities near the side of the floating scum collecting box 3 are continuously pushed into the floating scum collecting box 3, and are stored in the floating scum collecting box 3 for centralized treatment.

[0031] According to the requirements, the inclination angle of the filter plate can be in the range of 13° to 36°, so that the device can be normally used in the production process of different grades of resin. When the water discharge of the particle water is large, the inclination angle of the filter plate can be adjusted to be small, so as to slow down the moving speed of the floating scum, enable a large amount of water to pass through the filter plate into the circulating water tank 24, and thus reduce the water content in the floating scum in the floating scum collecting box 3, i.e. the residual cooling water content entering the floating scum collecting box 3 with the floating scum, and improve the filtering and recycling efficiency of the cooling water.

[0032] By such arrangement, the left side plate of the box body 1 protruding to the left in a circular arc shape is more consistent with the rotating track of the left end of the filter plate, reduces the gap between the left end of the filter plate and the inner wall of the left side of the box body 1, and reduces the probability of leakage of the floating scum impurities from the left end of the filter plate.

[0033] During use, when the inclination angle of the filter plate is large, the speed of the particle water flowing through the upper side of the filter plate is fast, the residence time of the particle water on the filter plate is short, the floating scum floats to the floating scum impurity gathering area for a short time, and the floating scum impurities are easily flowed into the floating scum collecting box 3 with the water flow, the filtering effect is relatively poor, and the water content in the floating scum impurities is high; when the inclination angle of the filter plate is small, the speed of the particle water flowing through the upper side of the filter plate is slow, the residence time of the particle water on the filter plate is longer, the floating scum floats to the floating scum impurity gathering area for a long time, and thus the cooling water content entering the floating scum collecting box 3 with the floating scum is low, the filtering effect is relatively good; therefore, during actual use, the inclination angle of the filter plate needs to be adjusted according to the production load of the resin particles and the water supplement of the cooling water and other factors.

[0034] Taking the production of resin particles of DMDA 8008T grade as an example, after the device is installed on the circulating water tank through the support, the floating scum in the cooling water can be effectively filtered, the recycling rate of the cooling water can be significantly improved, and the supplement amount of the cooling water can be reduced.

[0035] In the production of DMDA 8008T resin particles, the amount of supplementary cooling water is reduced by 0.5 t / h compared with not using the device, and the amount of production sewage discharged is also reduced by 0.5 t / h. The desalted water (cooling water) used is 39.51 yuan / ton, and the cost of treating a ton of sewage is 39.77 yuan. After using the device, the cost of producing DMDA 8008T can be reduced by about 28500 yuan / month.

[0036] In addition, the content of floating matter in the filtered cooling water is greatly reduced, the purity of the circulating cooling water in the production system is higher, and the problem of floating matter blocking the cooling water filter is effectively alleviated. At the same time, the switching frequency of the two cooling water filters is also reduced, and the risk of low cooling water flow causing the extruder to report low interlock shutdown during filter switching is further reduced. The content of floating matter in the cooling water is greatly reduced, which can effectively slow down the scaling speed of the cooler (plate heat exchanger), prolong the service life of the plate heat exchanger, reduce the switching and cleaning frequency of the plate heat exchanger, and greatly reduce the labor cost caused by cleaning the plate heat exchanger. The floating matter carried by the water liquid discharged to the production sewage tank is reduced, which can also effectively reduce the sludge formed by the deposition of floating matter in the production sewage tank, reducing the burden of cleaning the production sewage tank during maintenance. On the other hand, the reduction of floating matter in the sewage can also reduce the probability of floating matter blocking the sewage pump during sewage discharge, reducing the maintenance cost of the sewage pump.

[0037] According to the needs, the right end of the filter plate and the upper end of the baffle can be connected together through a hinge, and the structure of the filter plate is a prior art, which is uniformly distributed with filter holes for filtering floating impurities. The high-angle adjusting mechanism can adopt the existing technology fork lifting mechanism, hand-operated lifting mechanism, hand-operated scissor lifting mechanism, hand-operated laboratory lifting table lifting structure, etc. installed on the left lower side of the filter plate; or a pull rope fixed on the left end of the filter plate and a hook capable of hanging on the upper end of the box 1 can be used, and the hook and the pull rope are connected together; or a linear actuator or an adjustable telescopic rod can also be used, one end of the linear actuator or the adjustable telescopic rod is hinged to the left upper end of the box 1, and the other end is connected together with the left end of the filter plate, and the linear actuator can adopt a cylinder or an oil cylinder in the prior art. In order to facilitate the installation of the box 1 to the circulating water tank 24, a support matching the circulating water tank 24 can be provided on the lower side of the box 1, and after installation, the water outlet is aligned with the circulating water tank 24. Figure 3 It is shown that the length direction of the box 1 is consistent with the width direction of the circulating water tank 24, but in order to increase the area of the filter screen 22 and improve the filtering efficiency, the length direction of the box 1 can be consistent with the length direction of the circulating water tank 24. The box 1 and the baffle can be sealed and installed by welding or bonding.

[0038] This utility model has a reasonable and compact structure and is easy to use. Through the inclined filter plate with an adjustable inclination angle, it greatly reduces the water content in the foam impurities, effectively improves the recycling rate of cooling water, reduces water waste, and lowers the production cost of resin particles. The purity of the filtered cooling water is greatly improved, and the content of foam impurities in the water is greatly reduced, making the circulating cooling water in the production system cleaner. This reduces the switching frequency of the cooling water filter and also reduces the risk of the extruder triggering an interlock shutdown due to low cooling water flow during the switching of the cooling water filter. It effectively slows down the scaling rate of the cooler, reduces the sludge formed by foam deposition in the production wastewater tank, reduces the burden of cleaning the production wastewater tank during maintenance, reduces the frequency of foam clogging the wastewater pump during the external wastewater delivery process, and lowers the maintenance cost of the wastewater pump.

[0039] The above-mentioned box-type filters suitable for polyethylene resin production can be further optimized and / or improved according to actual needs:

[0040] Example 2: As an optimization of the above examples, as shown in the appendix Figure 1 , 2 As shown in Figure 3, the aforementioned high-position tilt adjustment mechanism includes a rotating shaft 4, a limiting part, a front connecting rod support part, and a rear connecting rod support part. The left side of the housing 1 has a through-hole, and the rotating shaft 4 is rotatably installed inside the adjusting hole. The rear part of the rotating shaft 4 extends out of the housing 1. A limiting part is provided between the outer rear part of the rotating shaft 4 and the rear side of the housing 1 to fix the rotating shaft 4. The front connecting rod support part and the rear connecting rod support part are fixedly installed at intervals on the rotating shaft 4 located inside the housing 1. The upper ends of the front connecting rod support part and the upper ends of the rear connecting rod support part are respectively... The first link is connected to the corresponding position on the lower left side of the filter plate; the rear link support includes a first link 5, a second link 6 and a third link 7. The lower end of the first link 5 is fixedly installed to the outer rear part of the rotating shaft 4. The upper end of the first link 5 is hinged to the right end of the second link 6. The left end of the second link 6 is hinged to the lower end of the third link 7. The upper end of the third link 7 is vertically fixedly installed at the corresponding position on the lower left side of the filter plate; the front link support has the same structure as the rear link support and is symmetrically distributed front and back.

[0041] During use, rotating the rear end of the rotating shaft 4 clockwise by a certain angle will cause the first connecting rod 5 to rotate to the right by a corresponding angle. The upper end of the first connecting rod 5 pulls the second connecting rod 6 to the right, causing the upper end of the second connecting rod 6 to rotate to the right. This increases the angle between the second connecting rod 6 and the third connecting rod 7, and increases the distance between the upper end of the third connecting rod 7 and the upper end of the first connecting rod 5, thereby increasing the tilt angle between the filter plate and the housing 1. Conversely, rotating the rear end of the rotating shaft 4 counterclockwise will decrease the tilt angle between the filter plate and the housing 1. In actual use, adjustments can be made according to factors such as the inlet flow rate of the granular water, the production load of the resin granules, and the amount of cooling water replenished.

[0042] The limiting part can fix the rotating shaft 4, so that the rotating shaft 4 can not rotate any more, thereby limiting the relative position between the rotating shaft 4 and the box 1, and ensuring that the filter plate can keep the set inclination angle. The limiting part can adopt the ratchet pawl stop mechanism or other known stop mechanism in the prior art.

[0043] According to the requirement, a handle can be installed on the outer side of the rear end of the rotating shaft 4 for facilitating the rotation of the rotating shaft 4; a sealing part can be arranged between the rear part of the rotating shaft 4 and the box 1, and the front end of the rotating shaft 4 and the box 1 can be connected together through a bearing seat.

[0044] Embodiment 3: As an optimization of Embodiment 2, as shown in FIG. 3, the limiting part is a fastening nut 8 which is connected to the outer side of the rear part of the rotating shaft 4 through screwing, and the front end of the fastening nut 8 abuts against the rear side of the box 1 after being tightened. Figure 3

[0045] In this way, the fastening nut 8 is adopted as the limiting part, which has simple structure, low cost, good interchangeability and reliable locking effect. For facilitating manual operation, the fastening nut 8 can adopt the hand-tightening nut or butterfly nut in the prior art.

[0046] During use, the fastening nut 8 is loosened, so that the limiting between the rotating shaft 4 and the box 1 is released, and the rotating shaft 4 can continue to rotate. Conversely, the fastening nut 8 is tightened, so that the rotating shaft 4 is prevented from continuing to rotate, and the relative position between the rotating shaft 4 and the box 1 is fixed, thereby keeping the inclination angle of the filter plate at the predetermined angle.

[0047] Embodiment 4: As an optimization of the above embodiments, as shown in FIG. 4, a rotating handle 9 is arranged on the outer side of the rear end of the rotating shaft 4. Figure 1 3 In this way, the inclination angle of the filter plate can be quickly adjusted without tools. The rotating handle 9 can adopt the straight handle, cross handle, trident handle or hand wheel in the prior art.

[0048] Embodiment 5: As an optimization of the above embodiments, as shown in FIGS. 5, 6 and 7, the filter plate comprises a low-position filter plate 10 and a high-position filter plate 11 which are both arranged in a left-high right-low inclination manner, the right end of the low-position filter plate 10 is rotatably installed with the upper end of the baffle, the left end of the low-position filter plate 10 is rotatably installed with the right end of the high-position filter plate 11, and the inclination angle of the low-position filter plate 10 is smaller than that of the high-position filter plate 11; the left part of the high-position filter plate 11 is connected with the box 1 through a high-position inclination angle adjusting mechanism, and the left part of the low-position filter plate 10 is provided with a low-position inclination angle adjusting mechanism which can independently adjust the inclination angle of the low-position filter plate 10.

[0049] Figure 1 2

[0050] ​​​​​In the above technical solution, the inlet pipe of the particulate water is located above the left side of the high-level filter plate 11. The high-level filter plate 11 with a large inclination angle can quickly filter and separate the cooling water in the particulate water. Under the combined action of water flow and gravity, it is more conducive for the foam and impurities in the particulate water to gather at the lower right end of the high-level filter plate 11, reducing the residence time of foam and impurities on the high-level filter plate 11 and improving the filtration efficiency of the cooling water. When the foam and impurities and a small amount of cooling water flow to the low-level filter plate 10 with a lower inclination angle, the water flow speed slows down, and the foam stays on the low-level filter plate 10 for a longer time, which is more conducive to fully filtering and separating the cooling water from the foam and impurities, increasing the amount of cooling water recovered, thereby reducing the amount of cooling water replenished in the circulating water tank 24 and improving the utilization efficiency of the cooling water.

[0051] The high-level filter screen 22 and the low-level filter screen 22 have different tilt angles, which can form a short-term water return depression at the connection between the high-level filter screen 22 and the low-level filter screen 22. This reduces the inertia of the foam and increases the contact time between the foam and the filter screen 22, so that the cooling water in the particulate water can be fully filtered by the filter screen 22. This effectively reduces the water content of cooling water in the foam and solves the problem that due to the high flow rate of particulate water, a large amount of cooling water flows into the foam bucket with the foam, increasing the frequency of foam cleaning and the low efficiency of cooling water recovery.

[0052] The areas of the high-level filter plate 11 and the low-level filter plate 10 can be determined according to the production load of the resin particles and the inflow rate of the granular water. In this embodiment, the structure of the low-level tilt angle adjustment mechanism is the same as that of the high-level tilt angle adjustment mechanism, and the specific dimensions can be determined according to the installation space between the low-level filter plate 10 and the bottom of the housing 1.

[0053] According to the requirements, the right end of the low-position filter plate 10 is rotatably installed together with the upper left side of the baffle via a hinge, and the left end of the low-position filter plate 10 is connected to the right end of the high-position filter plate 11 via a hinge.

[0054] Example 6: As an optimization of the above embodiments, as shown in the appendix Figure 1 , 2 As shown in Figure 3, a first cover 12 is hinged to the upper end of the left side panel of the box body 1, and a second cover 13 is hinged to the upper end of the rear side panel of the box body 1 corresponding to the right side of the first cover 12. The first cover 12 is provided with a water inlet pipe avoidance notch 14.

[0055] This design effectively prevents particulate water from splashing onto the outside of the housing 1 after it flows onto the filter plate, thus avoiding pollution of the working environment. In this embodiment, both the first cover 12 and the second cover 13 are connected to the housing 1 via hinges. The first cover 12 covers the upper left part of the housing 1, and the second cover 13 covers the remaining part of the housing 1.

[0056] According to the requirement, the water inlet pipe avoiding gap 14 can be a U-shaped gap with the opening facing right and penetrating up and down, which can accommodate at least two water return pipes, one of which is communicated with the water separator, and the other is communicated with the block separator and the centrifugal dryer.

[0057] Embodiment 7: As an optimization of the above embodiments, as shown in the accompanying drawings Figure 1 The water outlet is sealingly installed with a water outlet pipe 15.

[0058] By such an arrangement, the water outlet pipe 15 can guide the filtered cooling water to flow into the circulating water tank 24, reducing water splashing.

[0059] Embodiment 8: As an optimization of the above embodiments, as shown in the accompanying drawings Figure 1 、 2 As shown in the accompanying drawings, the lower part of the floating scum collecting tank 3 is in the shape of a truncated cone or a ladder platform with the upper part larger than the lower part, and the lower part of the floating scum collecting tank 3 is provided with a discharging port penetrating up and down, and a discharging pipe 16 is sealingly installed in the discharging port.

[0060] By such an arrangement, the floating scum collecting tank 3 with the bottom in the shape of a truncated cone or a ladder platform, the floating scum can automatically gather towards the discharging port under the action of gravity and be discharged out of the tank 1 through the discharging pipe 16. In order to facilitate the collection, transportation and treatment of the floating scum impurities, a floating scum collecting barrel can be placed on the ground below the discharging pipe 16, and the floating scum collecting barrel can be moved away for treatment when it is full.

[0061] Embodiment 9: As an optimization of the above embodiments, as shown in the accompanying drawings Figure 1 As shown in the accompanying drawings, the cooling water recovery tank 2 corresponding to the left side of the water outlet is sealingly installed with a first flow guide plate 17 inclined in the shape of left high and right low, and the cooling water recovery tank 2 corresponding to the right side of the water outlet is sealingly installed with a second flow guide plate 18 inclined in the shape of right high and left low.

[0062] By such an arrangement, the first flow guide plate 17 and the second flow guide plate 18 can form an inverted truncated cone or ladder platform structure at the bottom of the cooling water recovery tank 2, so that the cooling water can quickly gather towards the water outlet and be discharged into the circulating water tank 24 through the water outlet. The tank 1 with a flat bottom is more conducive to the installation of the support 23, so as to install the device on the circulating water tank 24. In this embodiment, the first flow guide plate 17 and the second flow guide plate can be sealingly installed by using the existing technology such as bonding and welding.

[0063] Embodiment 10: As an optimization of the above embodiments, as shown in the accompanying drawings Figure 1 、 2 As shown in the accompanying drawings, the baffle is installed with a baffle strip 19 at the upper end, the upper side of the baffle strip 19 is provided with an upwardly opening slot, and a buffer baffle 20 is arranged in the slot, and the upper end of the buffer baffle 20 is lower than the upper end surface of the tank 1.

[0064] By setting it up in this way, the buffer baffle 20 can extend the residence time of the scum in the scum impurity accumulation area as much as possible, so that the cooling water in the scum has a longer filtration time, thereby reducing the water content in the scum, improving the cooling water recovery efficiency, and improving the cooling water recycling rate.

[0065] During use, operators can control whether to install the buffer baffle 20 and the time interval for removing the buffer baffle 20 according to the actual filtration situation. When a large amount of scum accumulates in the scum and impurity accumulation area, the top layer of scum can be lifted by the lower layer of scum, allowing the upper layer of scum to pass over the top of the buffer baffle 20 and enter the scum collection box 3. When the scum and impurity accumulation area is too large, the buffer baffle 20 can be removed, and the baffle can be used to scrape the scum into the scum collection box 3 before the buffer baffle 20 is inserted back into the slot.

[0066] Depending on the requirements, the height of the buffer baffle 20 needs to be determined according to the actual situation, such as 3 to 5 centimeters. It should not be too high to reduce manual intervention. Under the condition of ensuring filtration efficiency and purity, the time interval for pulling out the baffle 19 should be extended as much as possible to reduce the workload of the operators.

[0067] Example 11: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, the filter plate includes an outer frame 21 and a filter screen 22. The filter screen 22 is detachably installed on the upper side of the outer frame 21, and a sealing strip is provided on the outer side of the outer frame 21 along the circumferential direction.

[0068] In the above technical solution, the outer frame 21 serves as a supporting skeleton, and the filter screen 22 is installed on the upper side of the outer frame 21 by threaded fasteners, so that filter screens 22 with different mesh sizes can be quickly replaced as needed; the sealing strip can effectively prevent particulate matter in the granular water from leaking from the gap between the outer frame 21 and the housing 1, thereby improving the filtration purity of the cooling water. Among them, the circumferential direction of the filter screen 22 mainly refers to the front side, left side and rear side.

[0069] Depending on the requirements, both the high-level filter plate 11 and the low-level filter plate 10 can adopt the aforementioned structure of outer frame 21 and detachable filter screen 22. The sealing strip can be an elastic sealing strip, a rubber sealing strip, or other movable sealing structures.

[0070] Example 12: As an optimization of the above embodiments, as shown in the appendix ​ , 2 As shown in Figures 1 and 3, a mounting bracket 23 is provided on the lower side of the middle part to the lower left end of the tank 1, and the mounting bracket 23 is adapted to the circulating water tank 24.

[0071] By setting up, in order to quickly install the box 1 to the circulating water tank 24. In this embodiment, the installation support 23 is a Z-shaped installation support 23, the number is four, is installed in the corresponding position of the lower side of the middle to the lower side of the left end of the box 1, the upper end of the circulating water tank 24 is provided with the mounting seat matched with the lower end of the Z-shaped installation support 23, and the Z-shaped installation support 23 and the mounting seat can be connected together through the threaded fastener.

[0072] The above technical features respectively constitute various embodiments of the present application, have strong adaptability and implementation effect, and can increase or reduce unnecessary technical features according to actual needs to meet the needs of different situations.

Claims

1. A box filter suitable for use in the production of polyethylene resin, characterized in that The utility model provides a resin particle cooling water recovery device, including box and filter plate, the upper end of box is left high right low inclination, the inboard of right part of box is sealedly fixed installation has baffle, baffle separates the cooling water recovery tank with left part in the middle part of box, simultaneously separates the floating collection tank with right part of box into two parts, the bottom of cooling water recovery tank is equipped with the water outlet that penetrates from top to bottom, is equipped with the filter plate that is left high right low inclination and sets up in cooling water recovery tank, and the upper end of baffle rotates together with the right end of filter plate, and the left part of filter plate and the box are equipped with high angle of inclination adjusting mechanism between, with the production load of resin particle and the water supply of cooling water correspondingly adjust the inclination angle of filter plate according to, 2. The tank filter suitable for polyethylene resin production according to claim 1, characterized in that, The high angle of inclination adjusting mechanism includes a rotating shaft, a limiting part, a front connecting rod support part and a rear connecting rod support part, the left part of the box is provided with an adjusting hole penetrating from front to back, the rotating shaft is rotatably installed in the adjusting hole, the rear part of the rotating shaft extends out of the box, and the limiting part is arranged between the rear part of the rotating shaft and the rear side of the box to fix the rotating shaft; The front connecting rod support part and the rear connecting rod support part are fixedly installed on the rotating shaft in the box in front of and behind each other, and the upper ends of the front connecting rod support part and the rear connecting rod support part are connected with the left part of the filter plate respectively; The rear connecting rod support part includes a first connecting rod, a second connecting rod and a third connecting rod, the lower end of the first connecting rod is fixedly installed with the rear part of the rotating shaft, the upper end of the first connecting rod is hingedly connected with the right end of the second connecting rod, the left end of the second connecting rod is hingedly connected with the lower end of the third connecting rod, and the upper end of the third connecting rod is perpendicularly fixedly installed on the corresponding position of the left part of the filter plate.

3. The tank filter suitable for polyethylene resin production according to claim 2, characterized in that, The limiting part is a fastening nut which is connected to the rear part of the rotating shaft through threads, and the front end of the fastening nut abuts against the rear side of the box after being tightened. Or / and, a rotating handle is arranged on the rear end of the rotating shaft.

4. A tank filter suitable for polyethylene resin production according to claim 1 or 2 or 3, characterized in that, The filter plate includes a low-position filter plate and a high-position filter plate which are both inclined left high right low, the right end of the low-position filter plate is rotatably installed with the upper end of the baffle, the left end of the low-position filter plate is rotatably installed with the right end of the high-position filter plate, and the inclination angle of the low-position filter plate is smaller than that of the high-position filter plate; the high-position filter plate is connected with the box through the high-angle adjusting mechanism, and the low-position filter plate is connected with the box through the low-angle adjusting mechanism which can independently adjust the inclination angle of the low-position filter plate.

5. The tank filter suitable for polyethylene resin production according to claim 1 or 2 or 3, characterized in that, The upper end of the left side plate of the box is hingedly connected with a first box cover, the upper end of the rear side plate of the box corresponding to the right side position of the first box cover is hingedly connected with a second box cover, and the first box cover is provided with a water inlet pipe avoiding notch; Or / and, a water outlet pipe is sealingly installed in the water outlet; Or / and, the lower part of the floating collection tank is in the shape of a truncated cone or a stepped cone, the lower part of the floating collection tank is provided with a discharge outlet penetrating from top to bottom, and a discharge pipe is sealingly installed in the discharge outlet; Or / and, a first guide plate inclined left high right low is sealingly installed in the cooling water recovery tank corresponding to the left side position of the water outlet, and a second guide plate inclined right high left low is sealingly installed in the cooling water recovery tank corresponding to the right side position of the water outlet.

6. The tank filter suitable for polyethylene resin production according to claim 4, characterized in that, The first box cover is hinged to the upper end of the left side plate of the box body, and the second box cover is hinged to the upper end of the rear side plate of the box body corresponding to the right side position of the first box cover; the first box cover is provided with a water inlet pipe avoiding notch; Or / and, the water outlet is sealingly installed with a water outlet pipe; Or / and, the lower part of the floating foam collecting box is in the shape of a truncated cone or a ladder platform, and the lower part of the floating foam collecting box is provided with an upper and lower through discharge port, and the discharge port is sealingly installed with a discharge pipe; Or / and, the cooling water recovery box corresponding to the left side position of the water outlet is sealingly installed with a first guide plate inclined in the shape of left high and right low, and the cooling water recovery box corresponding to the right side position of the water outlet is sealingly installed with a second guide plate inclined in the shape of right high and left low.

7. A tank filter suitable for polyethylene resin production according to claim 1 or 2 or 3 or 6, characterized in that, The upper end of the baffle is installed with a blocking strip, the upper side of the middle part of the blocking strip is provided with an upwardly open insertion slot, and the insertion slot is provided with a buffer baffle, and the upper end of the buffer baffle is lower than the upper end face of the box body; Or / and, the filter plate comprises an outer frame and a filter screen, the filter screen is detachably installed on the upper side of the outer frame, and a sealing strip is arranged on the outer side of the outer frame in the circumferential direction.

8. The tank filter suitable for polyethylene resin production according to claim 4, characterized in that, The upper end of the baffle is installed with a blocking strip, the upper side of the middle part of the blocking strip is provided with an upwardly open insertion slot, and the insertion slot is provided with a buffer baffle, and the upper end of the buffer baffle is lower than the upper end face of the box body; Or / and, the filter plate comprises an outer frame and a filter screen, the filter screen is detachably installed on the upper side of the outer frame, and a sealing strip is arranged on the outer side of the outer frame in the circumferential direction.

9. The tank filter suitable for polyethylene resin production according to claim 5, characterized in that, The upper end of the baffle is installed with a blocking strip, the upper side of the middle part of the blocking strip is provided with an upwardly open insertion slot, and the insertion slot is provided with a buffer baffle, and the upper end of the buffer baffle is lower than the upper end face of the box body; Or / and, the filter plate comprises an outer frame and a filter screen, the filter screen is detachably installed on the upper side of the outer frame, and a sealing strip is arranged on the outer side of the outer frame in the circumferential direction.

10. A tank filter suitable for polyethylene resin production according to claim 1 or 2 or 3 or 6 or 8 or 9, characterized in that, The lower side of the middle part of the box body to the lower side of the left end is provided with a mounting bracket, and the mounting bracket is matched with the circulating water tank.

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