Multifunctional screen exchanger

Abstract

The invention relates to the technical field of screen exchangers, in particular to a multifunctional screen exchanger which comprises a filtering unit, a cleaning unit and a power unit. The filter unit comprises a butt joint port and a filter pressing plate, and the butt joint port is matched with the cleaning unit; a feeding port is formed above the butt joint port, and a cleaning port is formed below the butt joint port. A cleaner is arranged in the cleaning unit, the cleaner comprises a plurality of blades which are uniformly distributed, and on one hand, the cleaner realizes isolation between the feeding hole and the cleaning hole, and on the other hand, the cleaner can scrape off and discharge impurities on the filter screen of the filter pressing plate; the power unit comprises a rotation driving unit and a translation driving unit, the rotation driving unit is used for rotating the cleaning unit, and the translation driving unit realizes tight sealing between the blades and the filter pressing plates and regular cleaning, overhauling and maintenance of equipment. The device is convenient to clean and maintain and has good stability, normal production is not affected during cleaning and maintenance, the cleaning frequency is reduced, and the production efficiency is effectively guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of screen changers, and in particular to a multifunctional screen changer. Background Art

[0002] Screen changers are widely used for filtering plasticized material melts. When the melt flows through the filter in the screen changer, foreign particles and impurities in the melt can be filtered out to obtain pure materials, which plays a particularly critical role in ensuring subsequent products.

[0003] As production proceeds, impurities in the filter will continue to accumulate and system pressure will increase, which will affect production efficiency on the one hand and pose a safety hazard on the other. Therefore, the filter needs to be cleaned and replaced from time to time according to actual production. In order to ensure that the continuity of production is not affected when the filter is replaced, a dual-channel filtration method is currently adopted to ensure that when the filter is replaced in one channel, the other channel can also work stably to ensure stable production. Therefore, in actual production, it is often necessary to frequently replace and clean the filter, which will consume a lot of operating time in the process, increasing the workload and not conducive to improving production efficiency.

[0004] Therefore, a screen changer that can effectively reduce the frequency of filter replacement and effectively ensure production efficiency during production operations is a technical problem that needs to be solved. Summary of the invention

[0005] The purpose of the present invention is to provide a multifunctional screen changer to solve the problem that the existing screen changer needs to frequently replace and clean the filter screen, which affects the production efficiency and increases the workload.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a multifunctional screen changer, comprising a filtering unit, a cleaning unit and a power unit;

[0007] The filter unit comprises a housing, a docking port is arranged on one side of the housing, the docking port is cylindrical, a feed port is arranged above the docking port, a cleaning port is arranged on the outer side below the docking port, a filter press plate is arranged inside the docking port, a filter screen is arranged on the filter press plate, and the rear of the filter press plate is connected to the discharge port;

[0008] The cleaning unit is matched with the docking port, and a cleaner is arranged at the front end of the cleaning unit, and the cleaner is matched with the filter press plate; the cleaner includes a plurality of blades arranged in a circumferential shape, and the blades are sealed with the filter press plate and the inner side surface of the docking port to isolate the feed port from the cleaning port;

[0009] The power unit includes a rotation drive unit and a translation drive unit. The rotation drive unit drives the cleaning unit to rotate. When the blades rotate, the impurities on the filter screen are scraped and discharged from the cleaning port; the translation drive unit drives the cleaning unit to move in a linear manner to achieve a tight seal between the blades and the filter press plate and regular cleaning, inspection and maintenance of the equipment.

[0010] Furthermore, a heat exchange cavity is provided in the shell, a heat exchange medium inlet is provided below the heat exchange cavity, and a heat exchange medium outlet is provided above the heat exchange cavity.

[0011] Furthermore, the cleaning unit includes a connecting part, the front end of which is connected to the cleaner; the cleaner includes a central connecting part, the central connecting part is connected to the connecting part, and the blades are evenly distributed on the central connecting part; the filter press plate includes a filter part and a supporting part, the filter part is fan-shaped, and the longitudinal section of the supporting part is a trapezoidal shape that is narrow at the top and wide at the bottom.

[0012] Furthermore, a central through hole is arranged at the center of the central connecting piece, and a plurality of connecting grooves are evenly distributed around the central through hole, the connecting grooves are slidingly and sealingly connected to the blades, and a connecting groove is arranged on the side where the blades contact the filter press plate, and the connecting groove is connected to the central through hole.

[0013] Furthermore, the number of the blades is six.

[0014] Furthermore, the rotation drive unit includes a fixing device, which is fixedly mounted on the base plate, an annular groove is arranged inside the fixing device, an annular cam is arranged outside the connecting part, and the annular groove and the annular cam are rotationally matched; a first sprocket is arranged at the end of the connecting part, and a driving motor is arranged on the base plate, the driving motor is transmission-connected to the second sprocket, and the second sprocket is connected to the first sprocket via a transmission chain.

[0015] Furthermore, the translation drive unit includes a hydraulic cylinder, a piston rod of the hydraulic cylinder is connected to one side of the base plate, and a cylinder body of the hydraulic cylinder is connected to the support plate; a rail is arranged below the base plate, and the base plate is slidably connected to the rail.

[0016] Furthermore, the filter unit includes two docking ports, each of which corresponds to a cleaning unit and a power unit.

[0017] Furthermore, the feed port is connected to the first feed pipe and the second feed pipe respectively, the first feed pipe and the second feed pipe are connected to a docking port respectively, and control valves are provided on the first feed pipe and the second feed pipe respectively.

[0018] Furthermore, the discharge port includes a first discharge pipe and a second discharge pipe, and the first discharge pipe and the second discharge pipe correspond to a docking port respectively; a connecting pipe is arranged between the first discharge pipe and the second discharge pipe, and control valves are arranged on the connecting pipe, the first discharge pipe and the second discharge pipe, and the control valves on the first discharge pipe and the second discharge pipe are located behind the connecting pipe; one end of the connecting pipe is connected to the throat of the venturi tube, and the venturi tube is arbitrarily arranged on the first discharge pipe or the second discharge pipe.

[0019] Beneficial effects of the present invention:

[0020] 1. During the production process, the present invention can clean the impurities on the filter screen of the filter press plate without stopping the machine, thereby effectively reducing the frequency of cleaning and replacing the filter screen during the production process, helping to reduce the work intensity and improve the production efficiency;

[0021] 2. The present invention has good stability during use. The mechanism design of the filter press plate makes the filter press plate have good compressive strength. Under the action of the translation drive unit, there is a good sealing effect between the blades and the filter press plate. At the same time, under the pressure of the internal melt, each blade expands radially, so that the blade and the inner side wall of the docking port can be sealed, ensuring the stability of use.

[0022] 3. The present invention is provided with at least two groups of filtering channels, so that at least one channel can be kept in working state during regular maintenance, thereby ensuring the continuity of production;

[0023] 4. The present invention can perform a backflushing operation, the purpose of which is to facilitate the replacement of the filter screen. Since the filter screen is tightly adhered to the filter screen plate under the action of pressure and melt viscosity, it is not convenient to replace the filter screen. The backflushing method can push the filter screen out of the filter screen part of the filter screen plate, making the replacement of the filter screen more convenient.

[0024] 5. The present invention sets a connecting pipe to realize the function of recoil, and cooperates with the venturi tube to ensure that the material in the connecting pipe is in a flowing state, so that during use, the material in the connecting pipe can be effectively prevented from cooling and solidifying and clogging the pipeline, which is convenient for stable operation of production. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall front cross-section of the present invention;

[0026] Figure 2 It is a schematic diagram of the front cross-section of the filter unit of the present invention;

[0027] Figure 3 It is a schematic diagram of the front cross-section of the cleaning unit of the present invention;

[0028] Figure 4It is a right side schematic diagram of the filter press plate of the present invention;

[0029] Figure 5 It is a right side cross-sectional schematic diagram of the filter press plate and the cleaner of the present invention when they are matched;

[0030] Figure 6 It is a left side schematic diagram of the cleaner of the present invention;

[0031] Figure 7 It is a schematic top view of the present invention as a whole.

[0032] The names corresponding to the marks in the figure are:

[0033] 1. Frame; 2. Screen changer; 21. Filter unit; 211. Docking port; 212. Feed port; 2121. First feed pipe; 2122. Second feed pipe; 213. Cleaning port; 214. Filter plate; 2141. Filter screen part; 2142. Support part; 215. Discharge port; 2151. First discharge pipe; 2152. Second discharge pipe; 2153. Venturi tube; 216. Heat exchange chamber; 2161. Heat exchange medium inlet; 2162. Heat exchange medium outlet; 217. Connecting pipe; 22. Cleaning unit; 2 21. Connecting part; 222. Center connecting piece; 2221. Center through hole; 2222. Connecting groove; 223. Blade; 2231. T-type connecting part; 2232. Connecting groove; 224. Annular cam; 225. First sprocket; 3. Power unit; 31. Rotation driving unit; 311. Fixing device; 312. Annular groove; 313. Driving motor; 314. Second sprocket; 315. Transmission chain; 32. Translation driving unit; 321. Track; 322. Bottom plate; 323. Hydraulic cylinder; 324. Support plate. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0035] Embodiments of the present invention:

[0036] like Figure 1-7 As shown, in one embodiment of the present invention, the screen changer 2 includes a filter unit 21 and a cleaning unit 22 , the filter unit 21 is mounted and fixed on the frame 1 , and the cleaning unit 22 is transmission-connected to the power unit 3 .

[0037] A docking port 211 is provided on one side of the filter unit 21. The docking port 211 is a cylindrical channel, and the docking port 211 is sealed with the cleaning unit 22; a feed port 212 is provided above the docking port 211, and a cleaning port 213 is provided on the lower outer side of the docking port 211; a filter press plate 214 is provided on the inner side of the docking port 211, and is connected with the discharge pipe at the rear of the filter press plate 214; the molten material enters the docking port 211 through the feed port 212, is filtered by the filter press plate 214, and the filtered material is discharged through the discharge port 215. The filter residue generated during the filtering process is cleaned by the cleaning unit 22, and then cleaned and discharged through the cleaning port 213; a heat exchange chamber 216 is provided in the filter unit 21, a heat exchange medium inlet 2161 is provided below the heat exchange chamber 216, and a heat exchange medium outlet 2162 is provided above the heat exchange chamber 216. The heat medium is introduced through the heat exchange chamber 216 to ensure that the melt is always in a molten state.

[0038] The filter press plate 214 is circular, and includes a filter part 2141 and a support part 2142 , wherein the filter part 2141 is fan-shaped, and the cross-section of the support part 2142 is a right-angled trapezoid that is wide at the bottom and narrow at the top; a filter that matches the shape of the filter part 2141 is placed on the filter part 2141 .

[0039] In another embodiment of the present invention, the feed port 212 is connected to a first feed pipe 2121 and a second feed pipe 2122, respectively, the first feed pipe 2121 and the second feed pipe 2122 are connected to the filter unit 21, and a control valve is provided on the first feed pipe 2121 and the second feed pipe 2122; correspondingly, the discharge port 215 includes a first discharge pipe 2151 and a second discharge pipe 2152, the filter unit 21 corresponding to the first feed pipe 2121 is connected to the first discharge pipe 2151, and the filter unit 21 corresponding to the second feed pipe 2122 is connected to the first discharge pipe 2151. Unit 21 is connected to the second discharge pipe 2152; a connecting pipe 217 is arranged between the first discharge pipe 2151 and the second discharge pipe 2152, and one end of the connecting pipe 217 is connected to the throat of the venturi tube 2153, and the venturi tube 2153 can be arbitrarily arranged on the first discharge pipe 2151 or the second discharge pipe 2152; a control valve is installed on the connecting pipe 217, and control valves are also installed on the first discharge pipe 2151 and the second discharge pipe 2152. The control valves on the first discharge pipe 2151 and the second discharge pipe 2152 are located at the rear of the connecting pipe 217.

[0040] In one embodiment of the present invention, the cleaning unit 22 includes a connecting portion 221, which is rollingly sealed with the docking port 211. A cleaner is arranged at the front end of the connecting portion 221, and the cleaner includes a central connecting member 222, which is fixedly connected to the center of the front end of the connecting portion 221. A central through hole 2221 is arranged at the center of the central connecting member 222, and a connecting groove 2222 is arranged around the periphery, and the connecting groove 2222 is connected to the central through hole 2221. The central connecting member 222 is sealedly connected to the blade 223 through the connecting groove 2222. A T-shaped connecting portion 2231 is arranged at the connection between the blade 223 and the central connecting member 222, and the T-shaped connecting portion 2231 is sealingly matched with the connecting groove 2222. A connecting groove 2232 is arranged on the side of the blade 223 in contact with the filter press plate 214, and the connecting groove 2232 is connected to the central through hole 2221.

[0041] In one embodiment of the present invention, the connecting portion 221 is transmission-connected with the power unit 3, wherein the power unit 3 includes a rotation drive unit 31 and a translation drive unit 32, the rotation drive unit 31 includes a fixing device 311, the fixing device 311 is two semicircular shapes and is fixed by bolt connection, an annular groove 312 is arranged on the inner side of the fixing device 311, and an annular cam 224 is correspondingly arranged on the connecting portion 221, and the annular cam 224 cooperates with the annular groove 312; a first sprocket 225 is arranged at the end of the connecting portion 221, and a second sprocket 314 is arranged below the first sprocket 225, the second sprocket 314 is connected to the driving motor 313, and the second sprocket 314 is transmission-connected with the first sprocket 225 via a transmission chain 315.

[0042] In another embodiment of the present invention, the fixing device 311 and the driving motor 313 are both installed on the base plate 322, and a rail 321 is arranged below the base plate 322, the rail 321 is slidably connected to the base plate 322, the base plate 322 is connected to the hydraulic cylinder 323, and the other end of the hydraulic cylinder 323 is connected to the support plate 324.

[0043] The principle of the present invention is:

[0044] The melt extruded by the extruder enters the filter unit 21 through the feed port 212. During the process, the feed port 212 is respectively connected to the first feed pipe 2121 and the second feed pipe 2122. Therefore, during the production process, when a filter unit 21 needs maintenance, the other can work normally to ensure continuous and stable production.

[0045] When the melt enters the filtration unit 21, due to the multi-blade 223 structure of the cleaner, the melt can only flow through the filter screen on the filter press plate 214, thereby filtering the melt. The filtered melt flows out through the discharge port 215 to the downstream wire drawing and granulation equipment, while impurities in the melt will be trapped on the filter screen in the filter press plate 214.

[0046] As the filtering time increases, more and more impurities are trapped on the filter screen, the filtering efficiency will decrease, and the energy consumption will increase, so timely cleaning is required. In actual production, a pressure sensor can be used to monitor the pressure change. When the filtering pressure rises to the set value, a cleaner can be used for cleaning. During the process, the driving motor 313 controls the connection part 221 to rotate, and at the same time, the blade 223 also rotates. The impurities on the filter screen will be scraped out during the rotation of the blade 223. In actual operation, the blade 223 rotates 180° each time. After the rotation is completed, a scraper is used to clean the impurities on the blade 223. The impurities on the filter screen can be cleaned repeatedly. During the cleaning process, the production does not need to be interrupted, and it can operate continuously and stably, which is convenient for use in actual production.

[0047] In the above process, there are certain requirements for the sealing between the cleaner and the docking port 211 to avoid material leakage; the cleaner is in close contact with the contact surface of the filter plate 214 to achieve sealing, and this process is achieved under the power of the hydraulic cylinder 323; the sealing between the cleaner and the inner side wall of the connection port is achieved by tightening the blade 223. Under the action of the melt pressure, when the blade 223 rotates to the filter screen part 2141, the melt will enter the central through hole 2221 of the central connecting member 222 through the connecting groove 2232 of the blade 223, so that the blade 223 will be squeezed to move outward and pressed on the inner side wall of the docking port 211, thereby achieving the sealing of the blade 223 and the side wall of the docking port 211; in actual production, according to needs, a sealing layer can be provided on the corresponding surface of the blade 223 and the side wall of the docking port 211 on the basis of the above, so that the sealing effect is better.

[0048] It should be noted that the blades 223 can only partially scrape off the impurities on the filter screen during rotation, and it is impossible to scrape off all the impurities in actual operation. Therefore, after the equipment has been running for a long time, it is inevitable to clean and maintain it. At this time, you only need to close the control valve on the corresponding feed pipe and the control valve on the connecting pipe 217, and control the hydraulic device to contract, so that the cleaning unit 22 can be pulled out from the docking port 211. At this time, the filter screen on the filter plate can be removed and cleaned; however, in actual operation, due to the high viscosity of the melt, it is often difficult to remove the filter screen. At this time, you only need to close the control valve on the corresponding discharge pipe and open the control valve on the connecting pipe 217. At this time, the melt in the other channel will produce a recoil effect on the filter screen at the filter plate in the channel. Under this recoil effect, the filter screen can easily fall off the filter screen plate and can be directly taken out from the cleaning port 213.

[0049] When the filter is replaced, start the hydraulic cylinder 323 to push the cleaning unit 22 back into the docking port 211. It should be noted in actual operation that if the single maintenance time is long (equipment failure, etc.), the blade 223 needs to be removed and the molten material in the center connector 222 needs to be cleaned to prevent the material from cooling and solidifying. If the time is short (replacing the filter, etc.), there is no need to clean the center connector 222.

[0050] In the present invention, a connecting pipe 217 is arranged between the first discharge pipe 2151 and the second discharge pipe 2152. Since the connecting pipe 217 is located outside the screen changer 2, the temperature of the material therein will gradually decrease, and there may be a hidden danger of pipeline blockage. Although an insulation layer is arranged outside the pipeline in actual production, heat loss cannot be avoided. Therefore, a Venturi tube 2153 is arranged at one end of the connecting pipe 217, so that the material flows slowly under the action of the pressure difference, thereby effectively avoiding the solidification of the material; in addition, in other embodiments of the present invention, the connecting pipe 217 can also be arranged inside the shell of the screen changer 2, and it directly exchanges heat with the heat exchange chamber 216 to avoid its blockage.

[0051] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A multifunctional screen changer, characterized in that: It comprises a filtering unit (21), a cleaning unit (22) and a power unit (3); The filtering unit (21) comprises a shell, a docking port (211) is arranged on one side of the shell, the docking port (211) is cylindrical, a feed port (212) is arranged above the docking port (211), a cleaning port (213) is arranged on the outside below the docking port (211), a filter press plate (214) is arranged inside the docking port (211), a filter screen is arranged on the filter press plate (214), and the rear of the filter press plate (214) is connected to the discharge port (215); The cleaning unit (22) is matched with the docking port (211), and a cleaner is arranged at the front end of the cleaning unit (22), and the cleaner is matched with the filter press plate (214); the cleaner comprises a plurality of blades (223) arranged in a circumferential shape, and the blades (223) are sealed with the filter press plate (214) and the inner side surface of the docking port (211), so that the feed port (212) and the cleaning port (213) are isolated from each other; The power unit (3) comprises a rotation drive unit (31) and a translation drive unit (32); the rotation drive unit (31) drives the cleaning unit (22) to rotate, and when the blades (223) rotate, the impurities on the filter screen are scraped and discharged from the cleaning port (213); the translation drive unit (32) drives the cleaning unit (22) to translate and move linearly, thereby achieving a tight seal between the blades (223) and the filter press plate (214) and regular cleaning, inspection and maintenance of the equipment.

2. A multifunctional screen changer according to claim 1, characterized in that: A heat exchange chamber (216) is provided in the shell, a heat exchange medium inlet (2161) is provided below the heat exchange chamber (216), and a heat exchange medium outlet (2162) is provided above the heat exchange chamber (216).

3. A multifunctional screen changer according to claim 1, characterized in that: The cleaning unit (22) comprises a connecting portion (221), the front end of which is connected to the cleaner; the cleaner comprises a central connecting piece (222), the central connecting piece (222) is connected to the connecting portion (221), and the blades (223) are evenly distributed on the central connecting piece (222); the filter press plate (214) comprises a filter part (2141) and a supporting part (2142), the filter part (2141) is fan-shaped, and the longitudinal section of the supporting part (2142) is a trapezoidal shape that is narrow at the top and wide at the bottom.

4. A multifunctional screen changer according to claim 3, characterized in that: A central through hole (2221) is provided at the center of the central connecting member (222), and a plurality of connecting grooves (2222) are evenly distributed around the central through hole (2221). The connecting grooves (2222) are connected to the blades (223) in a sliding and sealing manner. A connecting groove (2232) is provided on the side where the blades (223) contact the filter press plate (214), and the connecting groove (2232) is connected to the central through hole (2221).

5. The multifunctional screen changer according to claim 3, characterized in that: The number of the blades (223) is six.

6. A multifunctional screen changer according to claim 3, characterized in that: The rotation drive unit (31) comprises a fixing device (311), the fixing device (311) is fixedly mounted on a base plate (322), an annular groove (312) is arranged inside the fixing device (311), an annular cam (224) is arranged outside the connecting portion (221), and the annular groove (312) and the annular cam (224) are rotationally matched; a first sprocket (225) is arranged at the end of the connecting portion (221), a driving motor (313) is arranged on the base plate (322), the driving motor (313) is transmission-connected to a second sprocket (314), and the second sprocket (314) and the first sprocket (225) are connected via a transmission chain (315).

7. A multifunctional screen changer according to claim 6, characterized in that: The translation drive unit (32) includes a hydraulic cylinder (323), a piston rod of the hydraulic cylinder (323) is connected to one side of the bottom plate (322), and a cylinder body of the hydraulic cylinder (323) is connected to the support plate (324); a track (321) is arranged below the bottom plate (322), and the bottom plate (322) is slidably connected to the track (321).

8. A multifunctional screen changer according to any one of claims 1 to 7, characterized in that: The filtering unit (21) comprises two docking ports (211), and each docking port (211) corresponds to a cleaning unit (22) and a power unit (3).

9. A multifunctional screen changer according to claim 8, characterized in that: The feed port (212) is connected to the first feed pipe (2121) and the second feed pipe (2122) respectively. The first feed pipe (2121) and the second feed pipe (2122) are connected to a docking port (211) respectively. Control valves are provided on the first feed pipe (2121) and the second feed pipe (2122) respectively.

10. The multifunctional screen changer according to claim 8, characterized in that: The discharge port (215) includes a first discharge pipe (2151) and a second discharge pipe (2152), and the first discharge pipe (2151) and the second discharge pipe (2152) respectively correspond to a docking port (211); a connecting pipe (217) is arranged between the first discharge pipe (2151) and the second discharge pipe (2152), and control valves are arranged on the connecting pipe (217), the first discharge pipe (2151) and the second discharge pipe (2152), and the control valves on the first discharge pipe (2151) and the second discharge pipe (2152) are located behind the connecting pipe (217); one end of the connecting pipe (217) is connected to the throat of the venturi tube (2153), and the venturi tube (2153) is arbitrarily arranged on the first discharge pipe (2151) or the second discharge pipe (2152).

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