Melt-blown material net changing and receiving device, extruder and melt-blown material production line

Abstract

The utility model discloses a melt-blown material screen changing device which comprises a screen changer, two through holes arranged side by side in the vertical direction are formed in the screen changer, the two through holes penetrate through the two ends of the screen changer respectively, openings are correspondingly formed in the two opposite sides of the screen changer, and the two openings are communicated with the through holes respectively; the two plungers are installed in the two through holes respectively, through grooves are formed in plunger bodies of the plungers, filter screens are detachably installed in the through grooves, and the screen faces of the filter screens directly face the two openings; the column pusher is arranged at the end, provided with the through hole, of the screen exchanger, and the column pusher comprises two pushing columns so that the plunger can stretch out of the through hole; and the material receiving part is arranged below the other end, provided with the through hole, of the screen exchanger and is used for receiving the melt-blown material. The melt-blown material collecting device can prevent materials from being adhered to equipment, the ground and insteps of workers, solves potential safety hazards caused by net replacement, facilitates melt-blown material collection, and prevents the workers from being injured. The utility model further provides an extruder and a melt-blown material production line.

Description

TECHNICAL FIELD

[0001] The utility model relates to melt -blown material production field, especially in kind of melt -blown material screen changing material receiving device, extruder and melt -blown material production line. BACKGROUND

[0002] Melt -blown material is a kind of key raw material for melt -blown process production melt -blown cloth, melt -blown material has good fluidity, its melt flow rate is higher, it is convenient to form fine wire from spinneret at high temperature extrusion.Simultaneously, it has suitable molecular weight and distribution, can guarantee uniform wire during melt -blown process.Moreover, thermal stability is strong, can withstand high temperature environment in melt -blown process without easy decomposition, oxidation.It is widely used, especially in mask manufacturing, is important raw material of the important raw material of the core filter layer melt -blown cloth of mask, in addition, it is often used in air filtration, liquid filtration and other fields, plays a key role in improving filtration effect.

[0003] In the production and manufacturing process of melt -blown material, in order to ensure the quality of final product, melt -blown material in molten state must be filtered to remove impurities, gel and other foreign matters.In the process of changing screen, the traditional screen changing device is not only cumbersome to operate, consumes a lot of time and manpower, but also in the process of changing screen, melt -blown solution is easy to drop, melt -blown solution will stick to the equipment, causing equipment contamination, line scalding and breaking exist safety hazards, and also stick to the feet of workers, causing scalding and safety hazards. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving that melt -blown material is cumbersome to operate when changing screen, consumes a lot of time and manpower, in the process of changing screen, melt -blown solution is easy to drop, melt -blown solution will stick to the equipment, causing equipment contamination, line scalding and breaking exist safety hazards, and also stick to the feet of workers, causing scalding and safety hazards.The utility model provides a kind of melt -blown material screen changing material receiving device, extruder and melt -blown material production line, can avoid that material sticks to equipment, ground and worker's foot, solve the safety hazards caused by screen changing, facilitate melt -blown material collection, avoid worker injury.

[0005] To solve the above technical problems, the embodiment of the utility model discloses a kind of melt -blown material screen changing device, comprising:

[0006] Screen changer, two through holes are arranged in parallel along the vertical direction in it, two through holes are respectively through the two ends of screen changer, and two openings are respectively arranged on the opposite sides of screen changer, and the two openings are respectively communicated with the through holes;

[0007] Two plungers are respectively installed in two through holes, and the plug body of plunger is provided with a through slot, and the filter screen is detachably installed in the through slot, and the screen surface of filter screen is opposite to two openings;

[0008] The column pusher is arranged on the screen changer and has a through hole at one end, and comprises two push columns, which are respectively in abutment with the two plungers, and are used to push the plungers to move in the through hole so that the plungers extend out of the through hole.

[0009] The receiving part is arranged below the other end of the screen changer with the through hole and is used to receive the melt-blown material.

[0010] According to another specific embodiment of the present application, the embodiment of the present application discloses that the receiving part comprises:

[0011] The receiving plate is fixedly connected to the screen changer at one end, and is arranged at an angle with the screen changer in a vertical direction at the other end.

[0012] The collecting groove is arranged below the other end of the receiving plate, and the cooling liquid is arranged in the collecting groove and is used to cool the melt-blown material.

[0013] According to another specific embodiment of the present application, the embodiment of the present application discloses that the upper surface of the receiving plate is coated with an anti-adhesion coating, the lower surface of the receiving plate is attached to a heating plate, and the gap between the receiving plate and the heating plate is filled by the heat-conducting silica gel sheet.

[0014] According to another specific embodiment of the present application, the embodiment of the present application discloses that the angle between the receiving plate and the screen changer in the vertical direction is 30-50°, and is preferably 45°.

[0015] According to another specific embodiment of the present application, the embodiment of the present application discloses that the collecting groove is arranged in an inverted ladder shape, the protrusions are arranged on the inner wall of the collecting groove, and the filter screen is arranged in the collecting groove and is arranged on the protrusions.

[0016] According to another specific embodiment of the present application, the embodiment of the present application discloses that the column pusher structure further comprises a hydraulic driving system, the hydraulic driving system comprises a hydraulic pump, a hydraulic cylinder and an electromagnetic reversing valve, the hydraulic pump is connected to the push column and is used to provide power to the push column;

[0017] The hydraulic cylinder is connected to the hydraulic pump and the electromagnetic reversing valve through an oil pipe, and the electromagnetic reversing valve controls the advance and retreat and stop of the push column.

[0018] According to another specific embodiment of the present application, the embodiment of the present application discloses that the column pusher structure further comprises a guide mechanism, the guide mechanism comprises a guide sleeve and a guide rod, the guide sleeve is fixed to the upper end surface of the screen changer, the guide rod is coaxially fixedly connected to the push column, and the outer diameter of the guide rod is gap-fitted with the inner diameter of the guide sleeve.

[0019] According to another specific embodiment of the present application, the embodiment of the present application discloses a screen changer further comprising a heating belt and a pressure sensor, the heating belt is used for heating the screen changer, and the pressure sensor is used for detecting the pressure in the screen changer.

[0020] The embodiment of the present application further discloses an extruder comprising the melt-blown material screen changer and the melt-blown die of the above description, the melt-blown die is communicated with one of the openings of the screen changer, and is used for extruding the melt-blown material.

[0021] The embodiment of the present application further discloses a melt-blown material production line comprising the extruder and the feeding device of the above description, the feeding device is communicated with the other opening of the screen changer, and the feeding device sends the melt-blown material to the melt-blown die after the melt-blown material is filtered by the two plungers. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Fig. 1 shows a structure schematic diagram of a melt-blown material screen changer according to an embodiment of the present application;

[0023] Figure 2 Fig. 2 shows a structure schematic diagram of a melt-blown material production line according to an embodiment of the present application;

[0024] Figure 3 Fig. 3 shows a structure schematic diagram of a melt-blown material screen changer according to another embodiment of the present application; Figure 2 Fig. 4 shows an enlarged schematic diagram of the part A in Fig. 3. DETAILED DESCRIPTION

[0025] The embodiments of the present application will be described in detail by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the description. Although the description of the present application will be introduced in combination with the preferred embodiments, this does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application in combination with the embodiments is to cover other options or modifications which can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0026] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0027] In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0028] In the description of the present embodiment, it should be noted that the terms "set", "connected", "connected" should be understood broadly unless otherwise specified and limited, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

[0029] In order to make the purpose, technical scheme and advantages of the utility model more clear, the embodiments of the utility model will be further described in detail below with reference to the drawings.

[0030] Referring to Figures 1 to 3 The utility model provides a melt-blown material screen changing device, comprising:

[0031] The screen changer 1 is provided with two through holes arranged in parallel in the vertical direction, and the two through holes respectively pass through the two ends of the screen changer 1, and the opposite sides of the screen changer 1 are provided with two openings 11 respectively, and the two openings 11 are communicated with the through holes respectively;

[0032] Two plungers 2 are respectively installed in the two through holes, and the plug body of the plunger 2 is provided with a through slot, and a filter screen 3 is detachably installed in the through slot, and the screen surface of the filter screen 3 faces the two openings 11;

[0033] The column push 4 is arranged at one end of the screen changer 1 provided with the through hole, and the column push 4 comprises two push columns 41, and the two push columns 41 respectively abut against the two plungers 2, and the push column 41 is used for pushing the plunger 2 to move in the through hole, so that the plunger 2 extends out of the through hole;

[0034] The material receiving part 5 is arranged below the other end of the screen changer 1 provided with the through hole, and is used for receiving the melt-blown material.

[0035] The melt-blown material changing device provided in the embodiment can avoid the melt-blown material from adhering to the equipment, the ground and the soles of the workers, solve the safety hazard caused by changing the screen, facilitate the collection of the melt-blown material and avoid the injury of the workers. Specifically, the screen changer 1 is in the shape of a cuboid and is made of high-strength and high-temperature-resistant alloy steel. The screen changer 1 has good mechanical properties and thermal stability and can withstand the flow impact of the melt-blown material under high temperature and high pressure. Two cylindrical through holes are arranged in parallel in the screen changer 1 along the vertical direction. The diameter of the through holes is 120 mm, the depth is 300 mm, the center distance between the two through holes is 180 mm and the through holes penetrate the upper and lower ends of the screen changer 1. Rectangular openings 11 are arranged on the opposite sides of the screen changer 1 respectively. The size of the openings 11 is 150 mm in length and 100 mm in width. The edges of the openings 11 are finely chamfered and polished to reduce the resistance of the melt-blown material when flowing. The two openings 11 are vertically communicated with the corresponding through holes respectively to form the inlet and outlet channels of the melt-blown material.

[0036] The two openings 11 of the screen changer 1 are tightly connected with the melt-blown material conveying pipelines upstream and downstream in a flange connection mode. High-temperature-resistant and corrosion-resistant flexible graphite gaskets are arranged at the flange interfaces. The thickness of the gaskets is 3 mm. After being fastened by bolts, the gaskets can effectively prevent the melt-blown material from leaking. Meanwhile, positioning pins are arranged at the flange connection positions to ensure the accurate butt joint of the screen changer 1 and the pipelines and guarantee the smooth flow of the melt-blown material.

[0037] Two plungers 2 are tightly installed in the two through holes respectively. The plungers 2 are made of high-strength and wear-resistant alloy tool steel. The outer diameter of the plunger 2 is in clearance fit with the inner diameter of the through hole. The clearance is controlled to be between 0.08 mm and 0.12 mm to ensure that the plunger 2 can slide flexibly in the through hole and effectively prevent the melt-blown material from leaking. A circular groove is arranged on each plunger 2 for installing a filter screen 3. The diameter of the groove is 100 mm and the depth is 15 mm. A plurality of flow guide holes with a diameter of 5 mm are uniformly distributed on the bottom of the groove and penetrate the bottom of the plunger 2 so that the melt-blown material filtered by the filter screen 3 can flow out smoothly.

[0038] The filter screen 3 is fixed in the groove of the plunger 2 by a filter screen 3 pressing ring. The filter screen 3 pressing ring is made of stainless steel. The outer diameter of the filter screen 3 pressing ring is the same as the outer diameter of the groove and the inner diameter is slightly smaller than the outer diameter of the filter screen 3 by 2 mm to ensure that the filter screen 3 is effectively pressed. The filter screen 3 pressing ring and the plunger 2 are connected by a plurality of bolts which are uniformly distributed on the circumference of the pressing ring to ensure that the filter screen 3 is installed firmly and prevent the filter screen 3 from being displaced under the high pressure of the melt-blown material.

[0039] Two sealing grooves are arranged on the circumferential surface of the plunger 2 and high-temperature-resistant sealing rings are installed in the sealing grooves. Polytetrafluoroethylene sealing gaskets are further arranged on the top and bottom of the plunger 2 to further enhance the sealing effect between the plunger 2 and the screen changer 1.

[0040] The receiving part 5 is arranged below the other end of the screen changer 1 with a through hole, and is used to receive the melt-blown material to avoid the melt-blown material from dropping on the material to cause the workers to be injured.

[0041] In an implementable embodiment, the receiving part 5 comprises:

[0042] The receiving plate 51 is fixedly connected to the screen changer 1 at one end, and is arranged at an angle with the screen changer 1 in the vertical direction at the other end of the receiving plate 51.

[0043] The collecting groove 52 is arranged below the other end of the receiving plate 51, and the cooling liquid is arranged in the collecting groove 52, which is used to cool the melt-blown material. The upper surface of the receiving plate 51 is coated with an anti-adhesion coating, the lower surface of the receiving plate 51 is attached to the heating plate, and the gap between the receiving plate 51 and the heating plate is filled by the heat-conducting silica gel sheet.

[0044] In the vertical direction, the angle between the receiving plate 51 and the screen changer 1 is 30-50°, and preferably 45°.

[0045] The collecting groove 52 is arranged in an inverted ladder shape, and the convex is arranged on the inner wall of the collecting groove 52. The filtering screen 53 is arranged in the collecting groove 52 and is arranged on the convex.

[0046] In the embodiment, one end of the receiving plate 51 is fixedly connected to the screen changer 1, and the other end is arranged at an angle with the screen changer 1 in the vertical direction. In the vertical direction, the angle between the receiving plate 51 and the screen changer 1 is 30-50°, and the angle between the receiving plate 51 and the screen changer 1 is 30-50°. The angle range is verified by a large number of experiments, which can effectively receive the melt-blown material dropped on the receiving plate 51 while ensuring the smooth sliding of the melt-blown material. Preferably, the angle is 45°. Under this angle, the melt-blown material is affected by gravity and its own fluidity, and can slide from the receiving plate 51 to the collecting groove 52 at a relatively ideal speed and trajectory, reducing the residual melt-blown material on the receiving plate 51.

[0047] The upper surface of the receiving plate 51 is coated with an anti-adhesion coating, which is made of a mixture of polytetrafluoroethylene (PTFE) and nano ceramic particles. The content of polytetrafluoroethylene is 70%-80%, the content of nano ceramic particles is 20%-30%, the particle size is 50-100 nanometers, and the coating thickness is 50-100 micrometers. The coating is uniformly covered by the spraying process, so that the melt-blown material is not easy to adhere.

[0048] In an implementable embodiment, the upper surface of the receiving plate 51 can also be mirror-polished.

[0049] The lower surface of the heating plate is attached with a heating plate, which uses nickel-chromium alloy heating wire as the heating element, and the heating power is 1.5 kW. The gap between the receiving plate 51 and the heating plate is filled with heat-conducting silica gel sheet to improve the heat transfer efficiency. The heating plate is precisely controlled by a temperature controller to maintain the surface temperature of the receiving plate 51 at 200-220°C, ensuring good flowability of the melt-blown material.

[0050] The collection tank 52 is arranged in an inverted ladder shape, which helps to concentrate the melt-blown material and facilitates subsequent processing. The inner side wall is provided with a protrusion. It also includes a filter screen 53, which is arranged in the collection tank 52 and rests on the protrusion. The filter screen 53 can perform secondary filtration on the melt-blown material falling into the collection tank 52, further removing impurities. The collection tank 52 is provided with a cooling liquid, which is a water-based cooling liquid. It can effectively cool the melt-blown material and make it quickly solidify for recycling. The temperature of the cooling liquid is controlled at 5-15°C by a refrigeration unit.

[0051] In an implementable embodiment, the bottom of the collection tank 52 is provided with a 5° inclined surface, and the lowest part is provided with a discharge port connected to the external recycling pipeline through a valve. A liquid level sensor is installed on the side of the collection tank 52 for real-time monitoring of the liquid level of the melt-blown material in the tank. When the liquid level reaches the set upper limit, the liquid level sensor sends a signal to remind the operator to discharge the recycled melt-blown material in time.

[0052] The collection tank 52 is internally provided with a corrosion-resistant copper pipe cooling water circulation pipeline arranged in a serpentine layout, with a pipe diameter of 20 mm. The water inlet and outlet of the pipeline are located on opposite sides of the collection tank 52 and are connected to the external cooling water supply device and return device through a hose. The cooling water supply device includes a cooling water tank, a refrigeration unit, and a water pump. The volume of the cooling water tank is 500L, the refrigeration power of the refrigeration unit is 5kW, and the temperature of the cooling water can be controlled between 5-15°C. The flow rate of the water pump is 10m³ / h, and the head is 20m, which can provide stable cooling water supply for the circulation pipeline, ensure the continuous circulation of cooling water in the pipeline, and take away the heat of the melt-blown material to achieve the purpose of cooling. The warm water after absorbing heat is collected by the return device and can be recycled after heat dissipation and other treatments.

[0053] In an implementable embodiment, the column pusher 4 also includes a hydraulic drive system, which includes a hydraulic pump, a hydraulic cylinder 42, and an electromagnetic reversing valve. The hydraulic pump is connected to the push column 41 to provide power to the push column 41.

[0054] The hydraulic cylinder 42 is connected to the hydraulic pump and the electromagnetic reversing valve through an oil pipe, and the electromagnetic reversing valve controls the advance and retreat and stop of the push column 41. The column pusher 4 also includes a guide mechanism 43, which includes a guide sleeve and a guide rod. The guide sleeve is fixed to the upper end surface of the screen changer 1, and the guide rod is coaxially fixedly connected to the push column 41. The outer diameter of the guide rod is in clearance fit with the inner diameter of the guide sleeve.

[0055] In this embodiment, the column push 4 is provided on the screen changer 1 at one end (i.e. the upper end) with a through hole, mainly composed of two push columns 41, a hydraulic drive system and a guide mechanism 43. The push column 41 is made of high-strength alloy steel, with a diameter of 60 mm and a length of 200 mm. The surface is treated by chrome plating, with good wear resistance and corrosion resistance. The lower end of the push column 41 is hemispherical, in close contact with the top of the plunger 2, to uniformly transmit the pushing force.

[0056] The hydraulic drive system includes a hydraulic pump, a hydraulic cylinder 42, an electromagnetic reversing valve, an overflow valve and an oil tank. The hydraulic pump is a fixed displacement vane pump, with a rated flow of 20 L / min and a rated pressure of 16 MPa, capable of providing stable power for the push column 41. The hydraulic cylinder 42 has an inner diameter of 80 mm and a piston rod diameter of 40 mm, with a stroke of 150 mm. It is connected to the hydraulic pump and the electromagnetic reversing valve through the oil pipe. The electromagnetic reversing valve is a three-position four-way electromagnetic reversing valve, which can realize the forward, backward and stop actions of the push column 41. The set pressure of the overflow valve is 14 MPa, which is used to prevent the hydraulic system from overloading and protect the safety of the equipment. The oil tank has a volume of 100 L, with a liquid level gauge, an oil temperature gauge and a filter inside, to ensure the cleanliness and normal working temperature of the hydraulic oil.

[0057] To ensure the straightness and stability of the push column 41 during movement, a guide mechanism 43 is provided. The guide mechanism 43 is composed of a guide sleeve and a guide rod. The guide sleeve is fixed on the upper end surface of the screen changer 1, and the guide rod is coaxially fixed with the push column 41. The outer diameter of the guide rod is in clearance fit with the inner diameter of the guide sleeve, with a clearance of 0.1-0.15 mm. The guide sleeve and the guide rod are made of wear-resistant materials, with surface hardening treatment to reduce wear and prolong service life.

[0058] The action of the column push 4 is controlled by a programmable logic controller (PLC). In the normal filtering state, the push column 41 is in the retracted position, which does not affect the filtering process of the melt-blown material. When the filter screen 3 needs to be replaced, the operator sends a screen changing command to the PLC through the control panel. The PLC controls the electromagnetic reversing valve to switch the oil circuit, so that the hydraulic oil output by the hydraulic pump enters the rodless chamber of the hydraulic cylinder 42, pushing the push column 41 to move downward, thereby pushing the plunger 2 to extend out of the through hole. When the plunger 2 extends to the predetermined position, the travel switch sends a signal, and the PLC controls the electromagnetic reversing valve to switch the oil circuit, so that the push column 41 stops moving. After the filter screen 3 is replaced, the operator sends the command again, and the PLC controls the electromagnetic reversing valve to make the hydraulic oil enter the rod chamber of the hydraulic cylinder 42, so that the push column 41 retracts upward, driving the plunger 2 back to the filtering position.

[0059] In one implementable embodiment, the screen changer 1 further comprises a heating belt and a pressure sensor arranged therein. The heating belt is used to heat the screen changer 1, and the pressure sensor is used to detect the pressure in the screen changer 1.

[0060] The outer wall of the screen changer 1 is uniformly wound with heating resistance wires, the heating power is 5kW, and the temperature inside the screen changer 1 can be controlled at 230-250℃ through an intelligent temperature controller, so that the melt-blown material is always in a good molten state, the viscosity is reduced, and the flow and filtration are facilitated. A plurality of thermocouple temperature sensors are also installed at different positions of the screen changer 1 to monitor the temperature change in real time and feed back the data to the temperature controller to realize dynamic adjustment of the temperature.

[0061] The pressure sensor is arranged in the screen changer 1, and the pressure change in the screen changer 1 is monitored in real time through the pressure sensor, and the temperature is monitored through the temperature sensor, so that the filtration process is carried out under stable pressure and temperature conditions.

[0062] The melt-blown material screen changer device of the present application specifically operates as follows:

[0063] The screen changer 1 and the receiving plate 51 heating plate are started, the temperature of the screen changer 1 is set to 230-250℃, and the temperature of the receiving plate 51 is set to 200-220℃. After the temperature is stable, the melt-blown material conveying pipeline valve is opened, and the melt-blown material in a molten state enters the through hole from the one side opening 11 of the screen changer 1.

[0064] The melt-blown material is filtered by the plunger 2 filter screen 3, impurities and gels are intercepted, and the pure melt-blown material flows out from the other side opening 11 through the filter screen 3 and the flow guide hole to enter the subsequent process.

[0065] During the filtration process, the pressure change in the screen changer 1 is monitored through the pressure sensor, and the temperature of each part is monitored through the temperature sensor, so that the filtration is carried out under stable pressure and temperature conditions.

[0066] When the pressure sensor detects that the pressure in the screen changer 1 reaches the set upper limit value, it indicates that the filter screen 3 is blocked and needs to be changed. The operator sends a screen changing instruction to the PLC through the control panel, the PLC controls the electromagnetic reversing valve to switch the oil way, the hydraulic pump outputs hydraulic oil into the rodless cavity of the hydraulic cylinder 42, the push rod 41 pushes the plunger 2 to extend out of the through hole. When the plunger 2 reaches the predetermined position, the travel switch sends a signal, and the PLC controls the reversing valve to stop the push rod 41. Loosen the hexagonal bolts in the filter screen 3 pressure ring, remove the old filter screen 3, clean the residual melt-blown material in the plunger 2 groove, install a new filter screen 3 and tighten the bolts. The operator sends the instruction again, and the PLC controls the reversing valve to make the hydraulic oil enter the rod cavity of the hydraulic cylinder 42, and the push rod 41 retracts to drive the plunger 2 to return to the filtration position.

[0067] During the whole replacement process, when the upper plunger 2 is replaced, the column push 4 blocks the upper through hole, so that the melt-blown material only passes through the filter element in the lower plunger 2, and when the lower plunger 2 is replaced, the column push 4 blocks the lower through hole, so that the melt-blown material only passes through the filter element in the upper plunger 2, and the melt-blown material is continuously supplied during the whole conveying process, so that the filter element can be replaced without stopping, and the production efficiency is improved.

[0068] The embodiment of the utility model discloses a kind of extruders, it includes the melt-blown material screen changing material receiving device and melt-blown die head 6 of above-mentioned content, melt-blown die head 6 is communicated with one of the opening 11 of screen changer 1, for extruding melt-blown material.

[0069] In the embodiment, using the above-mentioned melt-blown material screen changing material receiving device, melt-blown die head 6 can continuously discharge, in melt-blown die head 6, melt-blown material is uniformly extruded from each spinneret according to the layout of spinneret, forms melt-blown filament, enters subsequent forming, collection etc.

[0070] Continue to refer to Figure 2 The embodiment of the utility model discloses a kind of melt-blown material production line, it includes the extruder and feeding device 7 of above-mentioned content of the extruder, feeding device 7 is communicated with another opening 11 of screen changer 1, and feeding device 7 is filtered after melt-blown material is passed through two plunger 2, sent to melt-blown die head 6.

[0071] In the embodiment, feeding device 7 can stably, uniformly deliver melt-blown material raw material to the screen changer 1 of extruder, after being filtered efficiently by plunger 2, again by melt-blown die head 6 extrusion molding, each link is closely coordinated, ensure that the coherence and high efficiency of entire production line production process, reduce the production interruption due to unstable feeding or filtering, extrusion problem, improve production efficiency.

[0072] Although the utility model has been illustrated and described by referring to some preferred embodiments of the utility model, those skilled in the art should understand that the above content is further detailed description of the utility model in combination with specific embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. Those skilled in the art can make various changes in form and detail, including making a number of simple inferences or substitutions, without departing from the spirit and scope of the utility model.

Claims

1. A meltblown web changer characterized by, include: The screen changer has two through holes arranged side by side in a vertical direction. The two through holes pass through both ends of the screen changer. Openings are opened on opposite sides of the screen changer. The two openings are respectively connected to the through holes. Two plungers are respectively installed in the two through holes. The plunger body has a through groove, and a filter screen is detachably installed in the through groove. The screen surface of the filter screen faces the two openings. A pusher is provided at one end of the screen changer where the through hole is provided. The pusher includes two pushers, which abut against two plungers respectively. The pushers are used to push the plungers to move within the through hole so that the plungers extend out of the through hole. The receiving section is located below the other end of the screen changer where the through hole is located, and is used to receive the meltblown material.

2. The meltblown web receiving device of claim 1, wherein The receiving part includes: The receiving plate has one end fixedly connected to the screen changer, and the other end of the receiving plate is set at an angle to the screen changer along the vertical direction downwards. A collection tank is located below the other end of the receiving plate, and the collection tank is filled with coolant to cool the meltblown material.

3. The meltblown web receiving device of claim 2, wherein The upper surface of the receiving plate is coated with an anti-sticking coating, and a heating plate is attached to the lower surface of the receiving plate. The gap between the receiving plate and the heating plate is filled with thermally conductive silicone sheet.

4. The meltblown web receiving device of claim 2, wherein Along the vertical direction, the angle between the receiving plate and the screen changer is 30-50°, preferably 45°.

5. The meltblown web receiving device of claim 2, wherein The collection trough is arranged in an inverted trapezoidal shape, and a protrusion is provided on the inner side wall of the collection trough. It also includes a filter screen, which is disposed in the collection trough and rests on the protrusion.

6. The meltblown web receiving device of claim 1 wherein, The push rod also includes a hydraulic drive system, which includes a hydraulic pump, a hydraulic cylinder and a solenoid directional valve. The hydraulic pump is connected to the push rod and is used to provide power to the push rod. The hydraulic cylinder is connected to the hydraulic pump and the solenoid directional valve via an oil pipe. The solenoid directional valve controls the advance, retreat, and stop of the push rod.

7. The meltblown web receiving device of claim 6, wherein The column pusher structure also includes a guide mechanism, which includes a guide sleeve and a guide rod. The guide sleeve is fixed to the upper end face of the screen changer, and the guide rod is coaxially fixedly connected to the pusher column. The outer diameter of the guide rod is clearance-fitted with the inner diameter of the guide sleeve.

8. The meltblown web receiving device of claim 1 wherein, The screen changer also includes a heating belt and a pressure sensor. The heating belt is used to heat the screen changer, and the pressure sensor is used to detect the pressure inside the screen changer.

9. An extruder characterized by, It includes a meltblown material screen changing and receiving device and a meltblown die head as described in any one of claims 1-8, wherein the meltblown die head is in communication with one of the openings of the screen changer for extruding the meltblown material.

10. A meltblown material production line characterized by, It includes the extruder and feeding device as described in claim 9, the feeding device being connected to another opening of the screen changer, the feeding device feeding the meltblown material to the meltblown die head after filtering it through the two plungers.

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