A waste discharging device for a screenless filter and a screenless filter

Abstract

The present invention provides a waste discharge device without a wire mesh filter and a wire mesh filter, belonging to the technical field of wire mesh filters. It solves the problem that the existing impurities after filtering are directly discharged, causing the molten plastic fluid contained in the impurities to be discharged together and wasted. The waste discharge device includes a discharge pipe and a first drive mechanism, the discharge pipe is provided with a first feed port, a discharge port and a power input port, and also includes a screw and a waste discharge valve structure, the waste discharge valve structure includes a valve seat, a partition and a second drive mechanism installed on the valve seat, the valve seat is provided with a first through hole and a blocking channel perpendicular to the axis of the first through hole, the partition is provided with a second through hole matching the first through hole, and the partition can move back and forth on the blocking channel so that the second through hole is arranged opposite to the first through hole so that the first through hole is connected to the discharge port, or is completely staggered so that the first through hole is completely isolated from the discharge port. The waste discharge device has the advantage of being able to improve the recovery rate of molten plastic fluid.

Description

Technical Field

[0001] The invention belongs to the technical field of wire-free filters and relates to a waste discharge device of a wire-free filter and the wire-free filter. Background Art

[0002] In the plastic granulation industry, in order to solve the problem that traditional filters need to frequently replace the filter screen, a wire-free filter has appeared on the market. This type of wire-free filter can filter the molten plastic mixture without setting a filter screen, so it is widely used in the market. The existing filter uses a filter plate structure to replace the original filter screen structure. The filter plate is densely provided with filter holes. When the wire-free filter is used to filter the granulated molten plastic mixture, the filter hole will filter and intercept the impurities in the molten plastic with a diameter larger than the diameter of the filter hole, and the molten plastic fluid after passing through the filter hole enters the discharge cavity and is output from the discharge port. In practice, the impurities intercepted by the filter need to be discharged, otherwise they will stay on the filter plate or even at the filter hole, thereby affecting the normal filtering function of the filter plate.

[0003] At present, impurity treatment is generally to discharge the impurities directly at any time through a discharge pipe. In order to solve the problem that the impurities are generally at extremely high temperature when discharged at any time, which may easily cause scalding accidents, a cooling device is installed at the discharge port of the discharge pipe to quickly cool it before discharging it. The problem is that in addition to solid impurities such as metals, the impurities still contain a certain proportion of molten plastic fluid. Direct discharge causes the part of the molten plastic fluid mixed in the impurities to be discharged along with it, resulting in waste. Summary of the invention

[0004] The purpose of the present invention is to solve the above technical problems and propose a waste discharge device without a wire mesh filter.

[0005] The object of the present invention can be achieved through the following technical solutions: A waste discharge device without a wire mesh filter, comprising a discharge pipe and a first driving mechanism, the discharge pipe is provided with a first feed port, a discharge port and a power input port, characterized in that it also includes a screw and a waste discharge valve structure installed at the discharge port of the discharge pipe, one end of the screw is connected to the above-mentioned first driving mechanism, the other end of the screw extends into the discharge pipe from the above-mentioned power input port and is located at the discharge port of the discharge pipe, the above-mentioned waste discharge valve structure comprises a valve seat, a partition and a second driving mechanism installed on the valve seat, the valve seat is provided with a first through hole and a blocking channel which is perpendicular to the axial line of the above-mentioned first through hole, the partition is provided with a second through hole which matches the above-mentioned first through hole, the partition is connected to the second driving mechanism and under the drive of the second driving mechanism, the partition can move back and forth on the above-mentioned blocking channel so that the second through hole is arranged opposite to the above-mentioned first through hole so that the first through hole is connected to the discharge port, or is completely staggered so that the first through hole is completely isolated from the discharge port.

[0006] In the waste discharging device of the above-mentioned screenless filter, the second driving mechanism is a first hydraulic cylinder.

[0007] In the waste discharging device of the above-mentioned screenless filter, the cross-section of the partition channel is rectangular, and the shape of the partition plate matches the shape of the partition channel.

[0008] In the waste discharging device of the above-mentioned screenless filter, both the first through hole and the second through hole are cylindrical holes.

[0009] In the waste discharging device of the above-mentioned screenless filter, a connector is installed on the end of the first through hole far from the discharge port by interference fit. A through hole communicating with the first through hole is opened on the connector. A flange is formed by radially protruding outward around the end of the connector far from the first through hole. There is a gap between the flange and the valve seat.

[0010] In the waste discharging device of the above-mentioned screenless filter, four square grooves are opened on the outer side wall around the flange.

[0011] In the waste discharging device of the above-mentioned screenless filter, the first driving mechanism includes a driving shaft and a driving motor connected to the driving shaft through a gear pair. One end of the above-mentioned screw rod is fixedly connected to the driving shaft.

[0012] A screenless filter includes a box body. The box body is provided with an installation cavity, a second feed inlet and a discharge outlet. A first filter plate and a second filter plate are arranged in the installation cavity. Filter through holes are provided on the first filter plate and the second filter plate. The first filter plate and the second filter plate divide the above-mentioned installation cavity into an independent discharge cavity and a first feed cavity and a second feed cavity respectively located on both sides of the discharge cavity. The discharge cavity is located between the first filter plate and the second filter plate and communicates with the above-mentioned discharge outlet. The first feed cavity and the second feed cavity both communicate with the above-mentioned second feed inlet. It is characterized in that: it further includes a third driving mechanism, a first scraper and a second scraper respectively located in the first feed cavity and the second feed cavity, and two above-mentioned waste discharging devices. The third driving mechanism is installed on the box body to drive the first scraper and the second scraper to move back and forth along the surfaces of the above-mentioned first filter plate and the second filter plate respectively. The first feed cavity and the second feed cavity communicate with the first feed inlets of the two above-mentioned waste discharging devices respectively.

[0013] In the above-mentioned wire-free filter, the box body includes a base located in the middle, a first side plate and a second side plate respectively located on both sides of the base and hinged to the base. The second feed port and the discharge port are opened on the base. The first filter plate and the second filter plate are installed on the base. The first filter plate, the base and the first side plate form the above-mentioned first feed cavity. The second filter plate, the base and the second side plate form the above-mentioned second feed cavity. The first filter plate, the second filter plate and the base form the above-mentioned discharge cavity.

[0014] In the above-mentioned wire-free filter, the third driving mechanism includes a driving plate, a cylinder base and a second hydraulic cylinder fixedly installed on the cylinder base. The cylinder base is fixedly installed on the above-mentioned box body through two first guide rods. The driving plate is sleeved on the above-mentioned two first guide rods and can slide up and down along the two first guide rods. Four second guide rods are fixedly connected to the driving plate. The first scraper and the second scraper are respectively fixedly connected to two of the above-mentioned four second guide rods.

[0015] Compared with the prior art, the waste discharging device of the present wire-free filter has the following advantages:

[0016] 1. The waste residues such as impurities left after filtration are not directly discharged, but are pushed out and discharged by the rotation of the screw. Since the temperature of the molten plastic mixture is generally relatively high, reaching about 200°C, the molten plastic that really needs to be recycled is in a liquid fluid state, while impurities such as sand, iron, copper, and aluminum are in a solid state. During the rotation of the screw, since the molten plastic is in a liquid fluid state, the molten plastic will flow back under the rotation and push of the screw, while the solid impurities such as sand, iron, copper, and aluminum will be pushed forward, so as to further separate the impurities containing the molten plastic fluid, push the solid impurities such as sand, iron, copper, and aluminum forward and accumulate them at the front end of the screw, and the molten plastic fluid will flow back and concentrate at the rear end of the screw. After concentrating and accumulating at the rear end of the screw, it can be secondarily filtered and recycled, so as to further filter this part of the molten plastic fluid into the discharge cavity, thereby improving the plastic recovery rate;

[0017] 2. The arrangement of the waste discharge valve structure enables waste materials such as impurities to be discharged regularly rather than at any time. Firstly, the waste materials such as impurities will wait for a certain period of time at the discharge port and then be discharged uniformly. Therefore, there is no need to set up a cooling device at the discharge port. During the waiting period, the impurities will cool naturally. Thus, the structure is simplified and the cost is reduced. Secondly, when the screw pushes the impurities towards the discharge port, the impurities in the front are blocked by the partition of the waste discharge valve structure. Under the push of the screw, the molten plastic fluid mixed in the impurities in the front will be pushed by the solid impurities such as sand, iron, copper, and aluminum pushed from the rear. Coupled with the fact that the front of the molten plastic fluid mixed in the impurities is blocked by the partition and the solid impurities such as sand, iron, copper, and aluminum in the front, the molten plastic fluid mixed in the impurities in the front will be squeezed by the solid impurities such as sand, iron, copper, and aluminum pushed from the rear to both sides of the solid impurities and behind the solid impurities pushed over. And the solid impurities such as sand, iron, copper, and aluminum pushed from the rear will squeeze towards the partition until they are blocked by the partition or other solid impurities. Therefore, the arrangement of the waste discharge valve structure makes the solid impurities continuously squeezed towards the partition, while the molten plastic fluid will be continuously displaced to the rear and get closer to the screw. Combined with the above-mentioned screw structure that continuously moves the displaced molten plastic fluid towards the rear end of the screw, the plastic recovery rate is further improved.

[0018] This wire-free filter has the following several advantages:

[0019] 1. Two sets of filtering and waste discharge structures that are symmetric left and right are adopted, improving the filtering and waste discharge efficiency. At the same time, the rotation directions of the first screw and the second screw are opposite, which is equivalent to the forces exerted by the first screw and the second screw on the box body canceling each other out, thus avoiding the unstable vibration force generated by the rotation of the first screw and the second screw on the box body and making the box body work more stably.

[0020] 2. When the molten plastic fluid accumulates at the rear end of the screw, driven by the back-and-forth movement of the scraper, a certain amount of the molten plastic fluid accumulated at the rear end of the screw will be carried to the filter plate for secondary filtering. At the same time, when the molten plastic fluid accumulated at the rear end of the screw accumulates to a certain extent, part of it will overflow to the filter plate for secondary filtering, thereby further filtering this part of the molten plastic fluid into the discharge cavity, thus improving the plastic recovery rate. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the waste discharge device of this wire-free filter.

[0022] Figure 2 is a schematic structural diagram of this filter.

[0023] Figure 3 is a partial exploded view of this filter.

[0024] Figure 4 This is another structural schematic diagram of the present filter.

[0025] Figure 5 is Figure 4 the sectional view taken along line A-A in

[0026] Figure 6 This is a partial exploded view of the other side of the present filter.

[0027] Figure 7 This is the structural schematic diagram of the box body.

[0028] Figure 8 This is the partial exploded view of the box body.

[0029] Figure 9 This is the structural schematic diagram of the base.

[0030] Figure 10 This is the structural schematic diagram of the waste discharge valve structure.

[0031] In the figure, 1. box body; 1a. second feed inlet; 1b. discharge outlet; 1c. discharging port; 1d. base; 1e. first side plate; 1f. second side plate; 2. first feed cavity; 3. second feed cavity; 4. discharge cavity; 41. first inner cavity; 42. second inner cavity; 5. first filter plate; 6. second filter plate; 7. feed seat; 8. feed channel; 9. first guide chute; 10. second guide chute; 11. discharge seat; 12. discharge channel; 12a. second discharge through hole; 13. support plate; 13a. first discharge through hole; 14. second hydraulic cylinder; 15. cylinder base; 16. first guide rod; 17. drive plate; 18. second guide rod; 19. first drive motor; 20. second drive motor; 21. valve seat; 21a. first through hole; 22. partition plate; 22a. second through hole; 23. first hydraulic cylinder; 24. connector; 25. convex edge; 26. square groove; 27. first scraper; 28. second scraper; 29. first discharging chute; 30. second discharging chute; 31. first screw; 32. second screw; 33. discharge pipe; 33a. first feed inlet; 34. screw; 35. drive motor. Detailed implementation manners

[0032] The following are specific embodiments of the present invention and in combination with the attached drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0033] Embodiment 1

[0034] As Figure 1As shown, the waste discharge device of the wire mesh filter includes a discharge pipe 33 and a first driving mechanism, the discharge pipe 33 is provided with a first feed port 33a, a discharge port 1c and a power input port, and also includes a screw 34 and a waste discharge valve structure installed at the discharge port 1c of the discharge pipe 33, one end of the screw 34 is connected to the above-mentioned first driving mechanism, the other end of the screw 34 extends from the above-mentioned power input port into the discharge pipe 33 and is located at the discharge port 1c of the discharge pipe 33, the waste discharge valve structure includes a valve seat 21, a partition plate 22 and a valve seat 21 installed on the valve seat 21. The second driving mechanism, the valve seat 21 is provided with a first through hole 21a and a blocking channel perpendicular to the axis of the first through hole 21a, the partition 22 is provided with a second through hole 22a matching the first through hole 21a, the partition 22 is connected to the second driving mechanism and driven by the second driving mechanism, the partition 22 can move back and forth on the blocking channel so that the second through hole 22a and the first through hole 21a are arranged opposite to each other so that the first through hole 21a is connected to the discharge port 1c, or completely staggered so that the first through hole 21a is completely isolated from the discharge port 1c. The first driving mechanism in this example includes a driving shaft and a driving motor 35 connected to the driving shaft through a gear pair, one end of the screw 34 is fixedly connected to the driving shaft, of course, in addition to the above-mentioned driving mode, other driving modes can also be used; the second driving mechanism is the first hydraulic cylinder 23.

[0035] Specifically, the cross section of the partition channel is rectangular, and the shape of the partition plate 22 matches the shape of the partition channel; the first through hole 21a and the second through hole 22a are both cylindrical holes. A connector 24 is installed with an interference fit on the end of the first through hole 21a away from the discharge port 1c, and a through hole connected to the first through hole 21a is opened on the connector 24. The end of the connector 24 away from the first through hole 21a protrudes radially outward to form a convex edge 25, and there is a gap between the convex edge 25 and the valve seat 21; four grooves are opened on the outer wall around the convex edge 25. The provision of the convex edge 25 and the gap facilitates the connection of the first through hole 21a with an external collection device, and discharges impurities and other waste residues to the collection device for unified collection and treatment to avoid environmental pollution. For example, for a garbage sack, the bag mouth of the garbage sack is directly put on the convex edge 25, and the bag mouth is tied in the gap to prevent slipping. Four square grooves 26 are provided on the outer walls around the convex edge 25. The square grooves 26 are also provided to facilitate connection with an external collecting device. For example, the collecting device is provided with a connector 24 matching the convex edge 25 and the square grooves 26, which can be directly connected, which is very convenient.

[0036] This waste discharging device enables the waste residues such as impurities left after filtration to be discharged not directly, but to be pushed out and discharged by the rotation of the screw 34. Since the temperature of the molten plastic mixture is generally relatively high, reaching about 200 °C, the molten plastic that really needs to be recycled is in a liquid fluid state, while impurities such as sand, iron, copper, and aluminum are in a solid state. During the rotation of the screw 34, since the molten plastic is in a liquid fluid state, the molten plastic will flow back under the rotation and push of the screw 34, while the solid impurities such as sand, iron, copper, and aluminum will be pushed forward, thereby further separating the impurities containing the molten plastic fluid, pushing the solid impurities such as sand, iron, copper, and aluminum forward and accumulating them at the front end of the screw 34, and the molten plastic fluid therein will flow back and concentrate at the rear end of the screw 34. After concentrating and accumulating at the rear end of the screw 34, secondary filtration and recycling can be carried out, so as to further filter this part of the molten plastic fluid into the discharge cavity 4, thereby improving the plastic recovery rate.

[0037] Meanwhile, the setting of the waste discharge valve structure enables the waste such as impurities to be discharged regularly instead of at any time. First, the waste such as impurities will wait for a certain time at the discharge port 1c and then be discharged uniformly. Therefore, there is no need to set a cooling device at the discharge port 1c. During the waiting time, the impurities will cool naturally. Thus, the structure is simplified and the cost is reduced. Second, when the screw 34 pushes the impurities towards the discharge port 1c, the impurities in the front are blocked by the partition plate 22 of the waste discharge valve structure. Under the push of the screw 34, the molten plastic fluid mixed in the impurities in the front will be squeezed by the solid impurities such as sand, iron, copper, and aluminum pushed from the rear. Coupled with the partition of the partition plate 22 and the solid impurities such as sand, iron, copper, and aluminum in the front in front of the molten plastic fluid mixed in the impurities, the molten plastic fluid mixed in the impurities in the front will be squeezed to both sides of the solid impurities by the solid impurities such as sand, iron, copper, and aluminum pushed from the rear and move to the rear of the solid impurities pushed over, and the solid impurities such as sand, iron, copper, and aluminum pushed from the rear will squeeze towards the partition plate 22 until blocked by the partition plate 22 or other solid impurities. Therefore, the setting of the waste discharge valve structure makes the solid impurities continuously squeezed towards the partition plate 22, and the molten plastic fluid will be continuously squeezed to the rear and get closer to the screw 34. Combining with the above-mentioned screw 34 structure to continuously move the squeezed-back molten plastic fluid towards the rear end of the screw 34, the plastic recovery rate is further improved.

[0038] Embodiment 2

[0039] As Figure 2 、 3As shown in FIGS. 4 and 5, this non-wire mesh filter includes a box body 1. The box body 1 is provided with an installation cavity, a second feed inlet 1a, a discharge outlet 1b and a discharge port 1c. A first filter plate 5 and a second filter plate 6 are arranged in the installation cavity. The first filter plate 5 and the second filter plate 6 are provided with filter through holes, and the filter through holes are micro holes with a diameter of 0.2 mm and are evenly distributed over the entire first filter plate 5 and the second filter plate 6. Among them, the box body 1 includes a base 1d in the middle and a first side plate 1e and a second side plate 1f respectively located on both sides of the base 1d and hinged to the base 1d. The first feed inlet 33a and the discharge outlet 1b are opened on both sides of the base 1d. The first filter plate 5 and the second filter plate 6 are installed on the base 1d. The first filter plate 5, the base 1d and the first side plate 1e form a first feed cavity 2, the second filter plate 6, the base 1d and the second side plate 1f form a second feed cavity 3, and the first filter plate 5, the second filter plate 6 and the base 1d form a discharge cavity 4. The hinged connection between the first side plate 1e and the second side plate 1f and the base 1d makes the maintenance more convenient. When it is necessary to repair the internal structure, for example, when overhauling the first filter plate 5 or the second filter plate 6, only need to open the first side plate 1e or the second side plate 1f.

[0040] Furthermore, as Figure 3 、 5 、FIGS. 7 and 9 show, a feed seat 7 is also installed on the base 1d. A groove is formed on the base 1d, and a feed channel 8 is formed between the groove and the feed seat 7. The first feed inlet 33a is opened on the feed seat 7 and the first feed inlet 33a is communicated with the feed channel 8. The upper ends of the first feed cavity 2 and the second feed cavity 3 are respectively provided with a first guide groove 9 and a second guide groove 10. Both the first guide groove 9 and the second guide groove 10 are communicated with the feed channel 8. The axial lengths of the openings of the first guide groove 9 and the second guide groove 10 respectively match the widths of the first filter plate 5 and the second filter plate 6.

[0041] Furthermore, as Figure 3 、 5As shown in Figures 6 and 8, a discharge seat 11 is also installed on the base 1d. A groove is formed on the base 1d, and a discharge channel 12 is formed between the groove and the discharge seat 11. The discharge port 1b is opened on the discharge seat 11, and both the discharge port 1b and the discharge cavity 4 are communicated with the discharge channel 12. A support plate 13 is also provided on the base 1d. The support plate 13 divides the discharge cavity 4 into a first inner cavity 41 and a second inner cavity 42. Three first discharge through holes 13a are opened on the support plate 13, and three second discharge through holes 12a respectively communicated with the three first discharge through holes 13a are opened on the discharge channel 12. The first inner cavity 41 and the second inner cavity 42 are communicated with the discharge channel 12 through the three first discharge through holes 13a and the second discharge through holes 12a. A heating device is installed above the base 1d to continue heating the molten plastic mixture entering the first guide groove 9 and the second guide groove 10, so as to prevent the plastic fluid in the molten plastic mixture from becoming solid due to temperature drop. The support plate 13 is an integral structure with the upper end of the base 1d, and the support plate 13 can well transfer the heat generated by the heating device at the upper end of the base 1d to the entire discharge cavity 4 to heat the filtered plastic fluid, so as to prevent the filtered plastic fluid from becoming solid and blocking the discharge due to temperature reduction.

[0042] As shown in Figure 2 , 3 , 4 and 5, this filter further includes a third driving mechanism, two waste discharging devices in the first embodiment, and a first scraper 27 and a second scraper 28 respectively located in the first feeding cavity 2 and the second feeding cavity 3.

[0043] Among them, the third driving mechanism includes a driving plate 17, a cylinder base 15, and a second hydraulic cylinder 14 fixedly installed on the cylinder base 15. The cylinder base 15 is fixedly installed on the box body 1 through two first guide rods 16. The driving plate 17 is sleeved on the two first guide rods 16 and can slide up and down along the two first guide rods 16. Four second guide rods 18 are fixedly connected to the driving plate 17. The first scraper 27 and the second scraper 28 are respectively fixedly connected to two of the four second guide rods 18. The first hydraulic cylinder 23 works to drive the two scrapers to move back and forth up and down along the surfaces of the first filter plate 5 and the second filter plate 6 respectively.

[0044] Further, as shown in Figure 2 , 4As shown in Figure 7, a first discharge trough 29 and a second discharge trough 30 are provided at the bottom of the casing 1, and the first discharge trough 29 and the second discharge trough 30 are equivalent to the first feed port 33a in the first embodiment. The part of the casing 1 forming the first discharge trough 29 and the second discharge trough 30 is equivalent to the discharge pipe 33 in the first embodiment. The first discharge trough 29 and the second discharge trough 30 are respectively located at the bottom of the first feed chamber 2 and the second feed chamber 3 and are respectively connected to the first feed chamber 2 and the second feed chamber 3. The axial lengths of the notches of the first discharge trough 29 and the second discharge trough 30 are matched with the first filter plate 5 and the second filter plate 6 respectively. The first discharge trough 29 and the second discharge trough 30 are respectively installed with a first screw 31 and a second screw 32, and the first discharge trough 29 and the second discharge trough 30 are connected to the discharge port 1c.

[0045] The first driving mechanism includes a first driving motor 19 and a second driving motor 20 connected to the first screw 31 and the second screw 32 respectively, and the first driving motor 19 and the second driving motor 20 drive the first screw 31 and the second screw 32 to rotate in opposite directions respectively. In addition to the above structure, the first driving mechanism can also include a driving motor and a driving gear shaft and a driven gear shaft fixed to the first screw 31 and the second screw 32 respectively, the driving gear shaft and the driven gear shaft are connected by gear meshing, and the driving gear shaft is connected to the output shaft of the driving motor through a chain. A major advantage of this structural design is that only one driving source is required to drive, simplifying the structure and thus reducing costs, and at the same time controlling the rotation direction of the first screw 31 and the second screw 32 to be opposite. The rotation directions of the first screw 31 and the second screw 32 are opposite, which is equivalent to the first screw 31 and the second screw 32 The forces acting on the box body 1 are offset each other, thereby avoiding the unstable vibration force generated by the rotation of the first screw 31 and the second screw 32 on the box body 1, making the box body 1 work more stably.

[0046] Among them, Figure 2 , 3 As shown in 10, the waste valve device is arranged at the discharge port 1c, including a valve seat 21, a partition 22 and a first hydraulic cylinder 23 installed on the valve seat 21. When setting, the two waste valve devices can be designed to be combined, that is, the two valve seats 21 of the two waste valve devices are combined into one, the two blocking channels and the two partitions 22 are combined into one, and a first hydraulic cylinder 23 is shared at the same time, that is, two first through holes 21a and a blocking channel perpendicular to the axis lines of the two first through holes 21a are opened on the valve seat 21, and two second through holes 22a respectively matching the two first through holes 21a are opened on the partition 22. The partition 22 is connected to the first hydraulic cylinder 23 and can move back and forth on the blocking channel under the drive of the first hydraulic cylinder 23 so that the two second through holes 22a are arranged opposite to the two first through holes 21a so that the first through holes 21a are connected to the discharge port 1c, or are completely staggered so that the first through holes 21a are completely isolated from the discharge port 1c.

[0047] Further, a connector 24 is installed on the end of the first through hole 21a away from the discharge port 1c by interference fit. A through hole communicating with the first through hole 21a is formed in the connector 24. A flange 25 is formed by radially protruding outward around the end of the connector 24 away from the first through hole 21a. There is a gap between the flange 25 and the valve seat 21. The setting of the flange 25 and the gap facilitates the connection between the first through hole 21a and an external collection device, discharging impurities and other waste residues onto the collection device for unified collection and treatment, avoiding environmental pollution. For example, for a garbage sack, directly put the mouth of the garbage sack over the flange 25, and tie the mouth in the gap to prevent slipping. Four square grooves 26 are formed in the outer side wall around the flange 25. The setting of the square grooves 26 is also for facilitating the connection with an external collection device. For example, if the collection device is equipped with a connector 24 matching the flange 25 and the square grooves 26, it can be directly connected, which is very convenient.

[0048] During operation, the molten plastic mixture enters from the first feed inlet 33a, passes through the feed channel 8 in sequence and then divides into two parts and enters the first feed tank and the second feed tank respectively, and flows onto the surfaces of the first filter plate 5 and the second filter plate 6 along the notches of the first feed tank and the second feed tank respectively. Since the air in the first feed chamber 2 and the second feed chamber 3 is heated by the high-temperature molten plastic mixture to form a high air pressure, and the discharge chamber 4 is communicated with the outside and the air pressure is lower than that of the first feed chamber 2 and the second feed chamber 3. Under the action of the air pressure difference, most of the molten plastic fluid with a diameter smaller than the diameter of the filter through holes on the first filter plate 5 and the second filter plate 6 enters the discharge chamber 4 through the filter through holes, and then passes through the first discharge through hole 13a on the support plate 13, the second discharge through hole 12a on the discharge channel 12 and the discharge channel 12 and enters the discharge port 1b for output and recycling. Solid impurities such as sand, iron, copper, and aluminum with a diameter larger than the filter through holes and a small part of the molten plastic fluid are blocked and retained on the surfaces of the first filter plate 5 and the second filter plate 6. When waste needs to be discharged, the second hydraulic cylinder 14 drives the first scraper 27 and the second scraper 28 to move downward to scrape the impurities and a small part of the molten plastic fluid mixture on the first filter plate 5 and the second filter plate 6 into the first discharge tank 29 and the second discharge tank 30 respectively. Then the first driving motor 19 and the second driving motor 20 work to drive the first screw 31 and the second screw 32 to rotate respectively, and push the impurities and a small part of the molten plastic fluid mixture forward. During the rotation of the screw, since the molten plastic is in a liquid fluid state, the molten plastic will flow back under the rotation and push of the screw, while solid impurities such as sand, iron, copper, and aluminum will be pushed forward, so as to further separate the impurities containing the molten plastic fluid, push the solid impurities such as sand, iron, copper, and aluminum forward and accumulate at the front end of the screw, and the molten plastic fluid therein will flow back and concentrate at the rear end of the screw. Then, driven by the back-and-forth movement of the scraper, a certain amount of the molten plastic fluid accumulated at the rear end of the screw will be carried back to the filter plate for secondary filtration. At the same time, when the molten plastic fluid accumulated at the rear end of the screw accumulates to a certain extent, it will also partially overflow directly onto the filter plate for secondary filtration, so as to further filter this part of the molten plastic fluid and recover it into the discharge chamber 4 to improve the plastic recovery rate.

[0049] During the filtering process, the partition plate 22 on the waste discharge valve is normally closed, that is, the second through hole 22a on the partition plate 22 of the waste discharge valve device and the first through hole 21a on the valve seat 21 are completely staggered under normal conditions, that is, the first through hole 21a is completely closed, so that the mixture of impurities and a small amount of molten plastic fluid pushed forward by the screw is blocked by the partition plate 22. The advantages of being normally closed are as follows: First, the impurities and other waste materials will wait for a certain time at the discharge port 1c and then be discharged regularly. Therefore, there is no need to set a cooling device at the discharge port 1c. During the waiting time, the impurities will cool naturally. Therefore, the structure is simplified and the cost is reduced. Second, when the screw pushes the impurities towards the discharge port 1c, the impurities in the front are blocked by the partition plate 22 of the waste discharge valve structure. Under the push of the screw, the molten plastic fluid mixed in the impurities in the front will be pushed by the solid impurities such as sand, iron, copper, and aluminum pushed from the back. In addition, the front of the molten plastic fluid mixed in the impurities is blocked by the partition plate 22 and the solid impurities such as sand, iron, copper, and aluminum in the front. Therefore, the molten plastic fluid mixed in the impurities in the front will be squeezed by the solid impurities such as sand, iron, copper, and aluminum pushed from the back to both sides of the solid impurities and behind the solid impurities pushed over. And the solid impurities such as sand, iron, copper, and aluminum pushed from the back will squeeze towards the partition plate 22 until they are blocked by the partition plate 22 or other solid impurities. Therefore, the setting of the waste discharge valve structure makes the solid impurities be continuously squeezed towards the partition plate 22, so that the solid impurities are concentrated and collected and piled up against the partition plate 22, while the molten plastic fluid will be continuously pushed to the back and get closer to the screw. Combined with the above screw structure, the molten plastic fluid pushed back is continuously moved towards the rear end of the screw for secondary filtration and recovery, further improving the plastic recovery rate. After filtering for a period of time, the partition plate 22 is opened to remove the front impurities close to the partition plate 22. At this time, the removed impurities are basically solid impurities.

[0050] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0051] Although terms such as housing 1, second feed inlet 1a, discharge outlet 1b, discharge opening 1c, base 1d, first side plate 1e, second side plate 1f, first feed chamber 2, second feed chamber 3, discharge chamber 4, first inner cavity 41, second inner cavity 42, first filter plate 5, second filter plate 6, feed seat 7, feed channel 8, first guide chute 9, second guide chute 10, discharge seat 11, discharge channel 12, second discharge through hole 12a, support plate 13, first discharge through hole 13a, second hydraulic cylinder 14, cylinder base 15, first guide rod 16, drive plate 17, second guide rod 18, first drive motor 19, second drive motor 20, valve seat 21, first through hole 21a, partition 22, second through hole 22a, first hydraulic cylinder 23, connection head 24, convex edge 25, square groove 26, first scraping plate 27, second scraping plate 28, first discharge chute 29, second discharge chute 30, first screw 31, second screw 32, discharge pipe 33, first feed port 33a, screw, drive motor are used more frequently in this text, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A waste discharge device without a wire mesh filter, comprising a discharge pipe (33) and a first driving mechanism, wherein the discharge pipe (33) is provided with a first feed port (33a), a discharge port (1c) and a power input port, Features: The invention also comprises a screw rod (34) and a waste discharge valve structure installed at a discharge port (1c) of a discharge pipe (33), wherein one end of the screw rod (34) is connected to the first driving mechanism, and the other end of the screw rod (34) extends from the power input port into the discharge pipe (33) and is located at the discharge port (1c) of the discharge pipe (33). The waste discharge valve structure comprises a valve seat (21), a partition plate (22) and a second driving mechanism installed on the valve seat (21), wherein the valve seat (21) is provided with a first through hole (21a) and a blocking channel perpendicular to the axis of the first through hole (21a), and the partition plate (22) is provided with a second through hole (21a) perpendicular to the axis of the first through hole (21a). The partition plate (22) is connected to a second driving mechanism and can move back and forth on the blocking channel under the drive of the second driving mechanism so that the second through hole (22a) and the first through hole (21a) are arranged opposite to each other so that the first through hole (21a) and the discharge port (1c) are connected, or the second through hole (22a) and the first through hole (21a) are completely offset so that the first through hole (21a) and the discharge port (1c) are completely isolated. When the first through hole (21a) and the discharge port (1c) are completely isolated, the molten plastic flows back to the rear end of the screw (34) under the rotation of the screw (34) for secondary filtration and recovery. A connector (24) is installed by interference fit on the end of the first through hole (21a) away from the discharge port (1c), and a through hole connected to the first through hole (21a) is formed on the connector (24). The end of the connector (24) away from the first through hole (21a) protrudes radially outward to form a convex edge (25), and a gap is formed between the convex edge (25) and the valve seat (21). The first driving mechanism comprises a driving shaft and a driving motor (35) connected to the driving shaft via a gear pair, and one end of the screw rod (34) is fixedly connected to the driving shaft.

2. A waste discharge device without a wire mesh filter according to claim 1, It is characterized in that The second driving mechanism is a first hydraulic cylinder (23).

3. A waste discharge device without a wire mesh filter according to claim 2, It is characterized in that The cross section of the blocking channel is rectangular, and the shape of the partition plate (22) matches the shape of the blocking channel.

4. A waste discharge device without a wire mesh filter according to claim 2 or 3, It is characterized in that The first through hole (21a) and the second through hole (22a) are both cylindrical holes.

5. A waste discharge device without a wire mesh filter according to claim 4, It is characterized in that Four square grooves (26) are formed on the outer side walls around the convex edge (25).

6. A wire-free filter, comprising a box body (1), the box body (1) being provided with an installation cavity, a second feed inlet (1a) and a discharge outlet (1b). The installation cavity is provided with a first filter plate (5) and a second filter plate (6). The first filter plate (5) and the second filter plate (6) are provided with filter through holes. The first filter plate (5) and the second filter plate (6) divide the installation cavity into an independent discharge cavity (4) and a first feed cavity (2) and a second feed cavity (3) respectively located on both sides of the discharge cavity (4). The discharge cavity (4) is located between the first filter plate (5) and the second filter plate (6) and communicates with the discharge outlet (1b). The first feed cavity (2) and the second feed cavity (3) both communicate with the second feed inlet (1a). It is characterized in that: It further includes a third driving mechanism, a first scraper (27) and a second scraper (28) respectively located in the first feed cavity (2) and the second feed cavity (3), and two waste discharging devices according to any one of the above claims 1-5. The third driving mechanism is installed on the box body (1) for driving the first scraper (27) and the second scraper (28) to move back and forth along the surfaces of the first filter plate (5) and the second filter plate (6) respectively. The first feed cavity (2) and the second feed cavity (3) respectively communicate with the first feed inlets (33a) of the two waste discharging devices.

7. A wire-free filter according to claim 6, It is characterized in that, The box body (1) includes a base (1d) in the middle and a first side plate (1e) and a second side plate (1f) respectively located on both sides of the base (1d) and hinged to the base (1d). The second feed inlet (1a) and the discharge outlet (1b) are opened on the base (1d). The first filter plate (5) and the second filter plate (6) are installed on the base (1d). The first filter plate (5), the base (1d) and the first side plate (1e) form the first feed cavity (2) as described above. The second filter plate (6), the base (1d) and the second side plate (1f) form the second feed cavity (3) as described above. The first filter plate (5), the second filter plate (6) and the base (1d) form the discharge cavity (4) as described above.

8. A wire-free filter according to claim 6 or 7, It is characterized in that, The third driving mechanism includes a driving plate (17), a cylinder base (15) and a second hydraulic cylinder (14) fixedly installed on the cylinder base (15). The cylinder base (15) is fixedly installed on the box body (1) through two first guide rods (16). The driving plate (17) is sleeved on the two first guide rods (16) and can slide up and down along the two first guide rods (16). Four second guide rods (18) are fixedly connected to the driving plate (17). The first scraper (27) and the second scraper (28) are respectively fixedly connected to two of the four second guide rods (18).

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