A cooling device for the production of special polypropylene meltblown materials

Abstract

The present invention belongs to the technical field of the production of special polypropylene meltblown materials, and discloses a cooling device for the production of special polypropylene meltblown materials, which includes a water tank. A cooling water inlet is provided at the bottom of the water tank, and an overflow port is provided at the top end of the side wall; and a water sliding groove, which includes a first water sliding plate and a second water sliding plate. One end of the first water sliding plate is connected to the overflow port, and the other end is smoothly and transitionally connected to the second water sliding plate. The horizontal position of the second water sliding plate is lower than that of the overflow port. By providing a water tank with flowing cooling water and a water sliding groove, after the molten and degraded special polypropylene meltblown material leaves the die head, it can fall into the water sliding groove with continuous cooling water, contact with the flowing water and be quickly and smoothly cooled, which is convenient for forming and drawing, so as to achieve stable startup and production, and greatly reduce waste.

Description

Technical Field

[0001] The present invention relates to the technical field of polypropylene meltblown special material production, and particularly relates to a cooling device for polypropylene meltblown special material production. Background Art

[0002] In the production of polypropylene meltblown special materials in the prior art, it is generally through a twin-screw extruder to melt and degrade into a suitable melt index, pass through a filter screen, be extruded through a vertical downward drawbar die head, then be cooled and shaped in a water tank, dehydrated by an air knife, pelletized, pneumatically conveyed and dried and homogenized, and finally packaged. However, when the polypropylene meltblown special material after melt degradation leaves the drawbar die head, the melt temperature is still as high as above 180°C, like water, and it is difficult to be drawn into strips. Especially when starting up, a large amount of waste materials will be generated; even if it has been drawn into strips, the drawbars often break during operation and are difficult to be stable. One broken drawbar will spread to all drawbars and cause the production to stop. Summary of the Invention

[0003] The purpose of the present invention is to provide a cooling device for polypropylene meltblown special material production to solve the problem that it is difficult to draw the polypropylene meltblown special material into strips or it is easy to break the strips after leaving the drawbar die head.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] A cooling device for polypropylene meltblown special material production, comprising:

[0006] A water tank, with a cooling water inlet provided at the bottom of the water tank and an overflow port provided at the top of the side wall;

[0007] A sliding water tank, the sliding water tank includes a first sliding water plate and a second sliding water plate. One end of the first sliding water plate is connected to the overflow port, and the other end is smoothly and transitionally connected to the second sliding water plate. The horizontal position of the second sliding water plate is lower than that of the overflow port.

[0008] Optionally, a sieve plate is provided in the water tank, the sieve plate is located at the cooling water inlet, and the sieve plate is connected to the inner wall of the bottom of the water tank.

[0009] Optionally, an anti-impact plate is provided in the water tank, the anti-impact plate is arranged above the sieve plate and fixed to the inner wall of the bottom of the water tank, and the maximum radial dimension of the anti-impact plate is smaller than the minimum radial dimension of the inner side wall of the water tank.

[0010] Optionally, a buffer plate is provided in the water tank, the buffer plate is arranged above the anti-impact plate and fixed to the inner side wall of the water tank.

[0011] Optionally, the buffer plate and the sieve plate are respectively any one of a perforated plate and a filter mesh plate.

[0012] Optionally, a water pressing plate is provided inside the water tank. The water pressing plate is arranged at the top of the water tank and can slide along the axial height direction of the water tank.

[0013] Optionally, the surfaces of the first water sliding plate and the second water sliding plate are both smooth planes.

[0014] Optionally, the cooling device for the production of polypropylene meltblown special material further includes a water receiving tank. The water receiving tank is arranged along the length direction of the first water sliding plate and the second water sliding plate and is located below the first water sliding plate and the second water sliding plate.

[0015] Optionally, the cooling device for the production of polypropylene meltblown special material further includes a baffle. The baffle is of an inverted U-shaped structure, and the opening faces downward and is buckled on the side walls on both sides of the water receiving tank. The inner end of the baffle located on the inner side of the side wall is connected to the first water sliding plate and the second water sliding plate.

[0016] Optionally, an adjusting member is provided between the baffle and the top surface of the side wall. The adjusting member is threadedly connected to the baffle and one end of the adjusting member abuts against the top surface of the side wall.

[0017] Advantages of the present invention:

[0018] A cooling device for the production of polypropylene meltblown special material according to the present invention, by providing a water tank with flowing cooling water and a water sliding tank, after the polypropylene meltblown special material after melting and degradation leaves the die head, it can fall into the water sliding tank with continuous cooling water, contact with the flowing water and be quickly and smoothly cooled, which is convenient for forming and drawing, so as to realize stable starting and production and greatly reduce waste. Description of the drawings

[0019] Figure 1 is the overall structural schematic diagram of a cooling device for the production of polypropylene meltblown special material provided by the present invention;

[0020] Figure 2 is the schematic diagram of the connection position of the water tank and the water sliding tank in a cooling device for the production of polypropylene meltblown special material provided by the present invention;

[0021] Figure 3 is the top view of the water sliding tank in a cooling device for the production of polypropylene meltblown special material provided by the present invention;

[0022] Figure 4 is the structural schematic diagram of the water tank in a cooling device for the production of polypropylene meltblown special material provided by the present invention.

[0023] In the figure:

[0024] 1. Water tank; 11. Cooling water inlet; 12. Overflow port; 13. Sieve plate; 14. Impact plate; 15. Buffer plate; 16. Pressurized water plate; 17. Sliding shaft; 2. Water chute; 21. First water slide plate; 22. Second water slide plate; 3. Water receiving tank; 4. Baffle; 41. Adjusting member; 42. Connecting member. Detailed implementation mode

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0026] As Figures 1-3 , this embodiment provides a cooling device for the production of polypropylene meltblown special materials, including a water tank 1 and a water chute 2. A cooling water inlet 11 is provided at the bottom of the water tank 1, and an overflow port 12 is provided at the top end of the side wall; the water chute 2 includes a first water slide plate 21 and a second water slide plate 22. One end of the first water slide plate 21 is connected to the overflow port 12, and the other end is smoothly connected to the second water slide plate 22 in a smooth transition. The horizontal position of the second water slide plate 22 is lower than that of the overflow port 12.

[0027] The cooling device provided in this embodiment is arranged below the draw die head. After the polypropylene meltblown special material after melting and degradation leaves the die head, it can vertically fall onto the first water slide plate 21 of the water chute 2. The water tank 1 can provide continuous cooling water. The cooling water flowing out from the overflow port 12 at a constant speed, high speed and stably forms a waterfall shape at the entrance of the first water slide plate 21, covering and cooling the high-temperature and low-viscosity polypropylene meltblown special material into a formed shape. This cooling device enables the polypropylene meltblown special material to contact the flowing cooling water and be quickly and smoothly cooled, facilitating forming and drawing, thereby realizing stable startup and production and greatly reducing waste. It should be explained that the cooling water inlet 11 in the water tank 1 is arranged at the bottom of the water tank 1, and the overflow port 12 is arranged at the top end of one side wall. When the cooling water continuously rises from the bottom of the water tank 1 until the top plate and then pours down to form a waterfall shape, and flows out through the overflow port 12 to the first water slide plate 21 and then to the second water slide plate 22. The vertically downward high-temperature polypropylene meltblown special material located above the first water slide plate 21 falls onto the first water slide plate 21 and is covered by the water flow and cooled and then continues to flow forward to the end of the second water slide plate 22. The continuous and stable cooling water and the smooth transition connection between the first water slide plate 21 and the second water slide plate 22 can ensure the stability of the cooling water and facilitate the cooling and forming of the high-temperature and low-viscosity polypropylene meltblown special material.

[0028] As Figure 4 , a sieve plate 13 is provided in the water tank 1. The sieve plate 13 is located at the cooling water inlet 11 and is connected to the inner wall of the bottom of the water tank 1.

[0029] The function of the sieve plate 13 is to filter the cooling water and prevent the water flow rate at the cooling water inlet 11 from being too large or the presence of large impurities from impacting the inside of the water tank 1. The sieve plate 13 only needs to be set at a size slightly larger than or equal to the size of the cooling water inlet 11 at the cooling water inlet 11, generally by connecting the sieve plate 13 at the opening at the bottom of the water tank 1.

[0030] Optionally, an anti-impact plate 14 is provided inside the water tank 1. The anti-impact plate 14 is arranged above the sieve plate 13 and fixed to the inner wall of the bottom of the water tank 1. The maximum radial dimension of the anti-impact plate 14 is smaller than the minimum radial dimension of the inner side wall of the water tank 1.

[0031] As Figure 4 shown in the embodiment, the anti-impact plate 14 is arranged at a height of 3 - 6 cm above the sieve plate 13 from the water inlet. The periphery of the anti-impact plate 14 is smaller than the periphery of the water tank 1, that is, the edge of the anti-impact plate 14 does not contact the inner wall of the water tank 1, and is used to prevent the water flow from directly flushing out of the water tank 1 upward.

[0032] Again, as Figure 4 , a buffer plate 15 is provided inside the water tank 1. The buffer plate 15 is arranged above the anti-impact plate 14 and fixed to the inner side wall of the water tank 1.

[0033] In some embodiments, the buffer plate 15 is at a distance of 12 - 25 cm from the bottom of the water tank 1. The four peripheral edges of the buffer plate 15 are in contact connection and fixed with the inner side wall of the water tank 1. The buffer plate 15 and the sieve plate 13 are respectively any one of a perforated plate and a filter mesh plate, or filled with a sieve mesh, etc., which can stably buffer the water flow and make the water reach a uniform water outlet speed in the plane when passing through the upper surface of the buffer plate 15.

[0034] Optionally, a water pressing plate 16 is provided inside the water tank 1. The water pressing plate 16 is arranged at the top of the water tank 1 and can slide along the axial height direction of the water tank 1.

[0035] Specifically, as Figure 4 shown, in this embodiment, a vertical sliding shaft 17 is provided on the inner side wall of the top plate of the water tank 1. The water pressing plate 16 is slidably connected to the sliding shaft 17. The water pressing plate 16 can slide up and down along the sliding shaft 17. The bottom end of the sliding shaft 17 is lower than the lower edge of the overflow port 12. The sliding distance of the water pressing plate 16 is from a position higher than the overflow port 12 to a position lower than the overflow port 12, so as to be able to adjust the height of the overflow port 12 and control the water flow rate entering the first water sliding plate 21. Preferably, the width of the side of the water pressing plate 16 facing the overflow port 12, the width of the first water sliding plate 21, and the width of the overflow port 12 are all equal, which is beneficial to stabilizing the water flow and preventing turbulence or disturbance.

[0036] Preferably, the surfaces of the first water sliding plate 21 and the second water sliding plate 22 are both smooth planes.

[0037] It should be noted that the first water ski board 21 has a certain arc from the overflow port 12 to the tail end, and its surface is smooth enough so that no turbulent flow is generated when water flows through it. In this embodiment, the surface finish of the first water ski board 21 and the second water ski board 22 reaches Ra0.1μm and there are no burrs. Otherwise, the rough surface is likely to change the flow direction of water, causing the water surface to flow disorderly and affecting the perfect molding of the special polypropylene meltblown material.

[0038] Optionally, the cooling device for the production of the special polypropylene meltblown material further includes a water receiving tank 3, which is arranged along the length direction of the first water ski board 21 and the second water ski board 22 and is located below the first water ski board 21 and the second water ski board 22.

[0039] Wherein, the two side walls of the water receiving tank 3 are connected to the two side edges of the first water ski board 21 and the second water ski board 22 to guide the water flow to move along the length direction of the first water ski board 21 and the second water ski board 22 so as to slide out after achieving the cooling effect. The overflow port 12 between the water tank 1 and the first water ski board 21 is set horizontally to ensure that the water outlet speed on the same cross-section of the first water ski board 21 is consistent and stabilize the water flow.

[0040] Optionally, the cooling device for the production of the special polypropylene meltblown material further includes a baffle 4. The baffle 4 is of an inverted U-shaped structure, with the opening facing downwards and buckling on the two side walls on both sides of the water receiving tank 3. The inner ends of the baffle 4 located on the side walls are connected to the two side edges along the length direction of the first water ski board 21 and the second water ski board 22.

[0041] Connecting the two side edges of the first water ski board 21 and the second water ski board 22 with the baffle 4 can further limit the smooth flow of the water flow, and is beneficial to the good coating and cooling of the water flow and the special polypropylene meltblown material. Optionally, the baffle 4 is welded to the two side edges of the first water ski board 21 and the second water ski board 22 to achieve good sealing and prevent water flow from leaking from both sides.

[0042] Such as Figures 1-3As shown, an adjusting member 41 is provided between the baffle 4 and the top surface of the side wall. The adjusting member 41 is threadedly connected to the baffle 4 and one end of the adjusting member 41 abuts against the top surface of the side wall. It can be understood that when the adjusting member 41 rotates relative to the baffle 4, since the end of the adjusting member 41 abuts against the top surface of the side wall, the distance between the baffle 4 and the top surface of the side wall can be adjusted, and the baffle 4 drives the first water slide plate 21 and the second water slide plate 22 connected thereto to move relative to the top surface of the side wall, so as to achieve the purpose of adjusting the heights of the first water slide plate 21 and the second water slide plate 22. In this embodiment, the adjusting member 41 is a screw or a bolt member. At least two adjusting members 41 are provided on each baffle 4. Two of the adjusting members 41 are respectively arranged at both ends in the length direction of the baffle 4. The adjusting member 41 is threadedly connected to the baffle 4, and the end of the screw or bolt abuts against the top surface of the side wall of the water receiving groove 3. When the screw or bolt rotates relative to the baffle 4, the height of the first water slide plate 21, especially the second water slide plate 22, can be adjusted. At the same time, a connecting member 42 is provided on the side surface of the baffle 4. There are multiple connecting members 42, and the multiple connecting members 42 are connected to the side surface of the baffle 4 for fixing the relative position of the baffle 4 on the water receiving groove 3. In the initial position, loosen the connecting member 42, and the positions of the first water slide plate 21 and the second water slide plate 22 relative to the water receiving groove 3 in the length direction can be adjusted, so as to adjust the radian or angle of the smooth transition between the first water slide plate 21 and the second water slide plate 22. Then, adjust the heights of the first water slide plate 21 and the second water slide plate 22 through the adjusting member 41. Finally, tighten the connecting member 42, and the baffle 4 and the water slide groove 2 are fixed on the water receiving groove 3. By adjusting the first water slide plate 21 and the second water slide plate 22 through the adjusting member 41 and the connecting member 42, and by adjusting the slope between the two, when transporting and cooling the special polypropylene meltblown material falling vertically, it is possible to avoid the special polypropylene meltblown material entering the water vertically, curling underwater, stretching out at a 90° turn, sticking and breaking the strip, so that the special polypropylene meltblown material falls on the water slide plate, contacts the water, and is transported and run by the water along the inclined plane, and is coated and isolated by the water to be formed as soon as possible, quickly reaching a certain strength and no longer breaking the strip.

[0043] The cooling device for the production of special polypropylene meltblown material provided by the present invention provides a large amount of cooling water through the water tank 1. The large-flow cooling water passes through four layers of buffers arranged in the water tank 1, so that the water flowing out of the overflow port 12 is at a constant speed and high-speed stable, forming a waterfall shape, and coating and cooling the high-temperature and low-viscosity special polypropylene meltblown material into a shape, solving the problems in the prior art that the special polypropylene meltblown material cannot be tractioned by force during extrusion, is very easy to break during the driving process, generates a lot of waste materials, and from time to time generates sticking or breaking of the material strip during normal production, and is not easy to produce stably. By using the cooling device provided by the present invention, conventional production can be realized, and it can be converted from driving to stable production in just a few minutes.

[0044] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and to the right" and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and to the left" and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0046] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0047] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A cooling device for the production of special polypropylene meltblown materials, characterized in that, Comprising: A water tank, with a cooling water inlet provided at the bottom of the water tank and an overflow port provided at the top end of the side wall; A water chute, the water chute includes a first water slide plate and a second water slide plate, one end of the first water slide plate is connected to the overflow port, and the other end is smoothly and transitionally connected to the second water slide plate, and the horizontal position of the second water slide plate is lower than that of the overflow port; A sieve plate is provided in the water tank, the sieve plate is located at the cooling water inlet, and the sieve plate is connected to the inner wall of the bottom of the water tank; An anti-impact plate is provided in the water tank, the anti-impact plate is arranged above the sieve plate and fixed to the inner wall of the bottom of the water tank, and the maximum radial dimension of the anti-impact plate is smaller than the minimum radial dimension of the inner side wall of the water tank; A buffer plate is provided in the water tank, the buffer plate is arranged above the anti-impact plate and fixed to the inner side wall of the water tank; A water pressing plate is provided in the water tank, the water pressing plate is arranged at the top of the water tank and can slide along the axial height direction of the water tank; The cooling device further includes a water receiving tank and a baffle, the baffle is of an inverted U-shaped structure, and the opening faces downward and is buckled on the side walls on both sides of the water receiving tank; An adjusting member is provided between the baffle and the top surface of the side wall, the adjusting member is threadedly connected to the baffle and one end of the adjusting member abuts against the top surface of the side wall; A connecting member is provided on the side surface of the baffle, there are a plurality of the connecting members, and the plurality of connecting members are connected to the side surface of the baffle for fixing the relative position of the baffle on the water receiving tank; 2. The cooling device for the production of special polypropylene meltblown material according to claim 1, characterized in that, The buffer plate and the sieve plate are respectively any one of a perforated plate and a filter mesh plate; 3. The cooling device for the production of special polypropylene meltblown material according to claim 1, characterized in that, The surfaces of the first water slide plate and the second water slide plate are both smooth planes; 4. The cooling device for the production of special polypropylene meltblown materials according to claim 1, characterized in that, The water receiving tank is arranged along the length direction of the first water slide plate and the second water slide plate and is arranged below the first water slide plate and the second water slide plate; 5. The cooling device for the production of special polypropylene meltblown material according to claim 4, characterized in that, The inner end of the baffle located on the inner side of the side wall is connected to the two side edges along the length direction of the first water slide plate and the second water slide plate.

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