Suction device capable of prolonging spinning plate cleaning period

Abstract

The utility model belongs to the technical field of spinning equipment, and relates to a suction device for prolonging spinning plate cleaning period, which comprises a valve, a control system unit and a horizontal plate arranged between spinneret plates and a windless area and provided with circular through holes, the circular through holes are in one-to-one correspondence with the spinneret plates and communicated with one end of a smoke exhaust pipe a, and the other end of the smoke exhaust pipe a is communicated with a smoke exhaust pipe b. The other end of the smoke exhaust pipe a is connected with the suction device, and the valve is arranged on the smoke exhaust pipe a; and the control system unit controls the opening degree of the valve according to the volatilization amount of the monomer sublimate between the spinneret plate and the windless area so as to control the suction speed, so that the suction amount of the suction device on the monomer sublimate is equal to the volatilization amount of the monomer sublimate. According to the suction device, the plate cleaning period can be effectively prolonged, the workload of manually cleaning scale on the pipe wall of the smoke exhaust pipe is reduced, meanwhile, different valve opening degrees can be adjusted according to different types of filaments, it is guaranteed that monomer sublimates can be rapidly removed, and meanwhile the adverse effect on the quality of filament bundles caused by too large suction force is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of spinning equipment technology, specifically relating to a suction device for extending the spinning cleaning cycle. Background Technology

[0002] During melt spinning, as polymers are extruded into fiber filaments through the small orifices of a spinneret, monomer sublimates are often released. These sublimates accumulate on the surface of the spinneret and around the orifices, gradually forming scale over time. This scale not only scratches the filaments, causing fuzz and breakage, but also affects the stability of spinning production and the quality of the finished product.

[0003] Currently, some existing technologies attempt to remove monomer sublimates through physical devices, thereby extending the cleaning cycle:

[0004] For example, patent CN112760725B discloses a method for extending the cleaning cycle of polyester fiber spinning. The method involves installing a volatile matter suction pipe connected to one end in the windless zone of the spinning process. The volatile matter suction pipe mainly includes an outer pipe, a vertical inner pipe, and a horizontal pipe. In the windless zone, channels communicating with each fiber outlet channel are respectively provided on opposite sides of the fiber outlet channel of the insulation board. The outer pipe corresponds one-to-one with the channels and is placed within them. One end of each outer pipe forms an inner chamfer, and the chamfered end face of the outer pipe is tangent to the insulation board wall forming the fiber outlet channel. The vertical inner pipe is located inside the outer pipe, and one end face of the vertical inner pipe is fitted with the inner chamfer of the outer pipe. The horizontal pipe is connected to the other end of the vertical inner pipe and is perpendicular to the vertical inner pipe. The horizontal pipe is connected to an exhaust pipe and a compressed air cleaning pipe via a three-way valve. The exhaust pipe connects to a space with a temperature of 25–30°C. Compared to the method without using the volatile matter suction pipe, this invention increases the cleaning cycle from 24 hours to over 72 hours. However, this method has some limitations in practical use. While some of the high-temperature monomer sublimation in the windless zone is expelled through thermal diffusion, some monomers still adhere to the wall of the exhaust pipe, causing the pipe diameter to gradually decrease and even become blocked. Therefore, the monomer sublimation cannot be effectively removed, resulting in some sublimation accumulating around the spinneret orifice, forming scale, and scratching the filaments.

[0005] For example, patent CN118390172B discloses a method for extending the cleaning cycle of spinning. This method involves adjusting the connection between the component and the top spinneret of the component slot, causing the component to move downwards until its lower surface is flush with the lower surface of the spinning box. An insulation board is then installed on the lower surface of the spinning box. The insulation board has through holes corresponding to the component slots. The vertical projection of the component slot is located inside the vertical projection of the through hole, or the vertical projection of the component slot completely overlaps with the vertical projection of the through hole. The insulation board has n channels, n≥1, one end of which connects to the through hole, and the other end connects to the outside. The diameter of the channel is 5-30mm, and the channel length is no more than 120mm. Each channel includes a b-segment, with a diameter of 5-15mm and a length of 70%-100% of the channel length. Compared to when the component does not move downwards and when no insulation board is added, this invention extends the cleaning cycle by more than two times. However, this method has drawbacks in practical applications. For example, because the suction speed cannot be adjusted, if the suction speed is too low, the monomer sublimation will gradually accumulate on the spinneret surface, and the cleaning cycle will not be significantly extended; if the suction speed is too high, it will interfere with the subsequent cooling effect of the fiber bundle, thereby damaging the quality of the fiber bundle. Therefore, it is difficult to find a balance point, that is, to remove as much monomer sublimation as possible without affecting the subsequent cooling effect of the fiber bundle.

[0006] Therefore, it is necessary to propose a new device that can extend the cleaning cycle to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to solve the problems in the prior art by proposing a suction device that extends the spinning cleaning cycle.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A suction device for extending the spinning plate cleaning cycle includes a horizontal plate disposed between the spinneret and the airless zone and having circular through holes, the circular through holes corresponding one-to-one with the spinneret, the circular through holes being connected to one end of the exhaust pipe a, the other end of the exhaust pipe a being connected to the suction device, and also includes a valve and a control system unit.

[0010] The valve is installed on exhaust pipe a;

[0011] The control system unit controls the valve opening based on the amount of monomer sublimation volatilized between the spinneret and the windless zone, thereby controlling the suction speed so that the amount of monomer sublimation suctioned by the suction device is equal to the amount of monomer sublimation volatilized.

[0012] The formula for calculating the amount of monomer sublimation volatilized per unit time is:

[0013] D = V d ×n×ρ1-(M1-M1×C) / T;

[0014] In the formula, D is in g / min, and V d These are the specifications for metering pumps, in cm. 3 / rev, n is the metering pump speed in rpm, and ρ1 is the melt density of the polyester fiber for this product in g / cm³. 3 M1 is the actual weight of a single yarn cake of this fiber variety when fully rolled, in g; C is the oiling rate of the yarn bundle of this variety; and T is the time to fully roll a single yarn cake of this fiber variety, in min.

[0015] The formula for calculating suction speed is:

[0016] V = D / ρ2;

[0017] In the formula, V is in L / min, and ρ2 is the density of the fiber monomer sublimation product of this variety, in g / L.

[0018] The derivation of the above formula is explained below:

[0019] Polyester melt is extruded from the metering pump to the spinneret, and after being oiled and wound into yarn, the weight of the yarn cake becomes lighter. This lighter portion is the monomer sublimation produced in the airless zone of the spinneret. The method for calculating the amount of monomer sublimation volatilization is to subtract the weight of the yarn bundle (excluding oil) when a single yarn cake is fully wound from the mass of polyester melt flowing out of the metering pump during the full-wound time period T.

[0020] The formula for calculating the mass of polyester melt passing through the metering pump during the full winding time T of a single fiber cake is: M = Q v ×ρ1×T, where: M is the mass of the polyester melt; Q v ρ1 is the volumetric flow rate of the polyester melt; ρ1 is the density of the polyester melt. Volumetric flow rate Q v Metering pump specification V d Calculated using the volume of melt discharged per revolution and the rotational speed n: Q v =V d Therefore, the formula for calculating the mass of polyester melt flowing out of the metering pump within the full winding time T of a single yarn cake can be written as: M = V d ×n×ρ1×T. Before the fiber is wound, an oiling process is added. The oil content of this part can be detected by an oiling rate tester and recorded as C. Then, the actual weight M1 of the yarn cake when the yarn is wound to full roll is accurately weighed. The oil content of the full roll can be written as: M2=M1×C. In summary, the mass of monomer sublimation in time period T can be written as: M3=M-(M1-M2)=V d The formula for calculating the mass of monomer sublimation per unit time can be written as: D=V ×n×ρ1×T-(M1-M1×C). d×n×ρ1-(M1-M1×C) / T.

[0021] The density ρ2 of the monomer sublimation in the gas environment below the spinneret can be determined by referring to the existing methods for measuring the density of sublimation. After obtaining the density ρ2 of the monomer sublimation, the required suction rate per unit time can be calculated: V = D / ρ2.

[0022] As a preferred technical solution:

[0023] The suction device for extending the spinning plate cleaning cycle as described above also includes a smoke exhaust pipe b;

[0024] The number of exhaust pipes b is equal to the number of circular through holes and they are connected one-to-one with each of the circular through holes;

[0025] All exhaust pipes b are connected to one end of exhaust pipe a, and the other end of exhaust pipe a is connected to the suction device.

[0026] The suction device for extending the spinning plate cleaning cycle as described above also includes a smoke exhaust pipe c;

[0027] Exhaust pipe a is connected to the suction device via exhaust pipe c.

[0028] As described above, in a suction device for extending the spinning cleaning cycle, the horizontal plate is an aluminum plate.

[0029] The suction device described above for extending the spinning plate cleaning cycle uses a solenoid valve.

[0030] The suction device described above for extending the spinning plate cleaning cycle is a suction pump.

[0031] The suction device for extending the spinning plate cleaning cycle as described above has 12 circular through holes.

[0032] Beneficial effects:

[0033] This invention provides a suction device for extending the spinning plate cleaning cycle. The suction amount of monomer sublimation is equal to the volatilization amount of monomer sublimation, so that monomer sublimation can be stably and continuously discharged, avoiding the accumulation and adhesion of monomer sublimation around the spinneret orifice and on the wall of the exhaust pipe. This can effectively extend the plate cleaning cycle and reduce the amount of manual cleaning of scale on the exhaust pipe wall.

[0034] This utility model discloses a suction device for extending the spinning plate cleaning cycle. It can adjust different valve openings according to different types of yarn to quickly remove monomer sublimation products without affecting the quality of the yarn bundle due to excessive suction force. Attached Figure Description

[0035] Figure 1This is a schematic diagram of a suction device for extending the spinning cleaning cycle according to the present invention.

[0036] Among them, 1-horizontal plate, 2-exhaust pipe b, 3-circular through hole, 4-valve, 5-control system unit, 6-exhaust pipe c, 7-suction device. Detailed Implementation

[0037] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0038] A suction device for extending the spinning plate cleaning cycle, such as Figure 1 As shown, it includes a horizontal plate 1, a smoke exhaust pipe a, a smoke exhaust pipe b2, a smoke exhaust pipe c6, a suction device 7, a valve 4, and a control system unit 5;

[0039] Suction device 7 is a suction pump;

[0040] The horizontal plate 1 is an aluminum plate, located between the spinneret and the windless zone, and has 12 circular through holes 3, which correspond one-to-one with the spinneret.

[0041] The number of exhaust pipes b2 is equal to the number of circular through holes 3 and they are connected one-to-one with each of the circular through holes 3; all exhaust pipes b2 are connected to one end of exhaust pipe a; the other end of exhaust pipe a is connected to exhaust pipe c6, and exhaust pipe c6 is connected to suction device 7.

[0042] Valve 4 is a solenoid valve, installed on exhaust pipe a;

[0043] The control system unit 5 controls the opening of valve 4 based on the amount of monomer sublimation volatilized between the spinneret and the windless zone per unit time, thereby controlling the suction speed per unit time, so that the amount of monomer sublimation sucked by the suction device is equal to the amount of monomer sublimation volatilized.

Claims

1. A suction device for extending the spinning plate cleaning cycle, comprising a horizontal plate (1) disposed between the spinneret and the windless zone and having circular through holes (3), wherein the circular through holes (3) correspond one-to-one with the spinneret, the circular through holes (3) are connected to one end of the exhaust pipe a, and the other end of the exhaust pipe a is connected to the suction device (7), characterized in that, It also includes valves (4) and a control system unit (5); Valve (4) is installed on exhaust pipe a; The control system unit (5) controls the opening of the valve (4) based on the amount of monomer sublimation volatilized between the spinneret and the windless zone per unit time, thereby controlling the suction speed per unit time, so that the amount of monomer sublimation suctioned by the suction device is equal to the amount of monomer sublimation volatilized.

2. The suction device for extending the spinning cleaning cycle according to claim 1, characterized in that, It also includes the exhaust pipe b(2); The number of exhaust pipes b(2) is equal to the number of circular through holes (3) and they are connected one-to-one with each other; All exhaust pipes b (2) are connected to one end of exhaust pipe a, and the other end of exhaust pipe a is connected to the suction device (7).

3. The suction device for extending the spinning cleaning cycle according to claim 1, characterized in that, It also includes the exhaust pipe c(6); The exhaust pipe a is connected to the suction device (7) via the exhaust pipe c (6).

4. The suction device for extending the spinning cleaning cycle according to claim 1, characterized in that, The horizontal plate (1) is an aluminum plate.

5. The suction device for extending the spinning cleaning cycle according to claim 1, characterized in that, Valve (4) is a solenoid valve.

6. The suction device for extending the spinning plate cleaning cycle according to claim 1, characterized in that, The suction device (7) is a suction pump.

7. The suction device for extending the spinning cleaning cycle according to claim 1, characterized in that, The number of circular through holes (3) is 12.

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