Nonwoven fabric spraying system and control method thereof

Abstract

The application discloses a non-woven fabric spraying system and a control method thereof. The non-woven fabric spraying system comprises a liquid preparation tank, a liquid supply pump and a spraying device. The spraying device comprises a support, a first liquid supply main pipe, a second liquid supply main pipe, a first horizontal rod, a second horizontal rod and a plurality of spray guns. The first liquid supply main pipe and the second liquid supply main pipe are horizontally arranged above and below the non-woven fabric respectively and are fixedly connected with the support. The first horizontal rod and the second horizontal rod are located above and below the non-woven fabric respectively and can adjust the position along the column of the support. The spray gun comprises an upper spray gun arranged on the first horizontal rod and a lower spray gun arranged on the second horizontal rod. The first horizontal rod and / or the second horizontal rod can rotate around the axis thereof. The liquid inlet of the liquid supply pump is connected with the liquid preparation tank through a first pipeline. The liquid outlet is connected with a flow divider through a second pipeline. A backflow pipe connected with the second pipeline is connected with the liquid preparation tank and is provided with a backflow valve. The non-woven fabric spraying system can better realize high-precision and low-flow spraying operation.

Description

Technical Field

[0001] This invention relates to the field of nonwoven fabric production technology, and in particular to a nonwoven fabric spraying system and its control method. Background Technology

[0002] Currently, the spraying equipment used on nonwoven fabric production lines generally suffers from a single operating mode, making it difficult or impossible to flexibly adjust to different additive addition schemes to achieve high-precision, low-flow spraying operations. Consequently, situations such as additive waste or substandard addition amounts frequently occur. Therefore, how to improve the nonwoven fabric spraying system to better achieve high-precision, low-flow spraying operations has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0003] This invention provides the following technical solution:

[0004] A nonwoven fabric spraying system includes a liquid preparation tank, a liquid supply pump, and a spraying device, wherein the spraying device includes:

[0005] The support includes columns located on both sides of the nonwoven fabric in the width direction of the nonwoven fabric;

[0006] The first liquid supply main pipe is placed horizontally above the non-woven fabric and fixedly connected to the bracket;

[0007] The second liquid supply main pipe is placed horizontally below the non-woven fabric and fixedly connected to the bracket.

[0008] The first horizontal bar is located above the non-woven fabric. Both ends of the first horizontal bar are connected to the column and can be adjusted along the column to change the height of the first horizontal bar.

[0009] The second crossbar is located below the non-woven fabric. Both ends of the second crossbar are connected to the column and can be adjusted along the column to change the height of the second crossbar.

[0010] Multiple spray guns, including an upper spray gun arranged on the first crossbar and a lower spray gun arranged on the second crossbar, wherein the upper spray guns are connected to the first liquid supply main pipe through a first liquid supply branch pipe and the lower spray guns are connected to the second liquid supply main pipe through a second liquid supply branch pipe, and each spray gun has a fan-shaped nozzle.

[0011] The first crossbar and / or the second crossbar are rotatable around their own axis to adjust the angle at which the sprayed liquid hits the fabric. The first and second main liquid supply pipes are both connected to a distributor. The inlet of the liquid supply pump is connected to the liquid distribution tank through a first pipeline. The outlet of the liquid supply pump is connected to the distributor through a second pipeline. A return pipe connected to the second pipeline is connected to the liquid distribution tank. A return valve is provided on the return pipe.

[0012] Optionally, in the above-mentioned nonwoven fabric spraying system, the water curtains sprayed by adjacent spray guns are parallel to each other and form water curtain gaps, and the water curtain gaps form a first angle with the width direction of the nonwoven fabric.

[0013] Optionally, in the above-mentioned nonwoven fabric spraying system, the fan-shaped nozzle is connected to the body of the spray gun through a gap adjustment mechanism, which is used to adjust the size of the first included angle.

[0014] Optionally, in the above-described nonwoven fabric spraying system, the position of the spray gun on the first crossbar and / or the second crossbar is adjustable to change the distance between adjacent spray guns.

[0015] Optionally, the above-mentioned nonwoven fabric spraying system includes a mixer with one outlet and three inlets. The outlet of the mixer is connected to the liquid preparation tank via a pipeline. The first inlet of the mixer is connected to a first auxiliary agent supply pipeline, the second inlet of the mixer is connected to a second auxiliary agent supply pipeline, and the third inlet of the mixer is connected to a water supply pipeline. Metering pumps are installed on both the first and second auxiliary agent supply pipelines. A flow meter is installed on the water supply pipeline. The upstream of the flow meter is connected to the upstream of the metering pump via a bypass pipeline, and a solenoid valve is installed on the bypass pipeline.

[0016] Optionally, in the above-mentioned nonwoven fabric spraying system, both the first auxiliary agent supply pipeline and the second auxiliary agent supply pipeline are equipped with electric valves, and the bypass pipeline is connected in parallel to the pipeline between the metering pump and the electric valve.

[0017] Optionally, in the above-mentioned nonwoven fabric spraying system, a stirrer is provided in the liquid preparation tank.

[0018] A control method for a nonwoven fabric spraying system, executed in the nonwoven fabric spraying system disclosed in any of the above claims, the control method comprising:

[0019] Turn on the upper spray gun and turn off the lower spray gun to enter the upper spray mode;

[0020] Turn on the lower spray gun and turn off the upper spray gun to enter the lower spray mode;

[0021] Turn on the upper spray gun and the lower spray gun to enter the double-sided spray mode.

[0022] Optionally, the above control method includes: changing the liquid flow rate to the spray device by adjusting the liquid supply pump via frequency conversion.

[0023] Optionally, the above control method includes: changing the liquid flow rate to the spray device by adjusting the opening of the return valve.

[0024] The present invention can achieve the following beneficial effects: compared with the traditional non-woven fabric spraying system, it can better achieve high-precision, low-flow spraying operation, which greatly meets the actual production needs for flexible adjustment of auxiliary agent addition scheme. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is a front view of the spray device in the nonwoven fabric spraying system provided in this embodiment of the invention. Figure 1 ;

[0027] Figure 2 yes Figure 1 A schematic diagram of the back of the spray device shown;

[0028] Figure 3 yes Figure 1 An enlarged view of point A in the diagram;

[0029] Figure 4 This is a front view of the spray device in the nonwoven fabric spraying system provided in this embodiment of the invention. Figure 2 ;

[0030] Figure 5 yes Figure 4 Top view of the spray system shown;

[0031] Figure 6 yes Figure 4 BB section view in the middle;

[0032] Figure 7 yes Figure 4 A schematic diagram of the spray system from a CC cross-sectional perspective;

[0033] Figure 8 This is a schematic diagram of the nonwoven fabric spraying system provided in an embodiment of the present invention.

[0034] The diagram is marked as follows:

[0035] 1. Bracket; 21. First main gas supply pipe; 22. Second main gas supply pipe; 31. First main liquid supply pipe; 32. Second main liquid supply pipe; 41. First crossbar; 5. Handwheel; 6. Drain pipe; 71. First branch gas supply pipe; 72. Second branch gas supply pipe; 81. First branch liquid supply pipe; 82. Second branch liquid supply pipe; 9. Gap adjustment mechanism; 10. Locking element; 11. Micro cylinder. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] See Figures 1 to 8 This invention provides a nonwoven fabric spraying system, including a liquid preparation tank, a liquid supply pump, and a spraying device. The spraying device includes a support 1, a first liquid supply main pipe 31, a second liquid supply main pipe 32, a first crossbar 41, a second crossbar, and multiple spray guns. The support 1 includes columns located on both sides of the nonwoven fabric along its width. The first liquid supply main pipe 31 and the second liquid supply main pipe 32 are respectively positioned horizontally above and below the nonwoven fabric and are both fixedly connected to the support 1. The first crossbar 41 and the second crossbar are respectively located above and below the nonwoven fabric and are both connected to the columns and can be adjusted along the columns to change their height. The spray guns include a row of upper spray guns on the first crossbar 41 and a row of lower spray guns on the second crossbar. The upper spray guns are connected to the first liquid supply main pipe 31 via a first liquid supply branch pipe 81, and the lower spray guns are connected to the second liquid supply main pipe 32 via a second liquid supply branch pipe 82. The spray guns have fan-shaped nozzles, which are nozzles capable of spraying a fan-shaped water curtain. Figure 1 As shown, the water curtain sprayed by the upper spray gun onto the non-woven fabric forms an equilateral triangle, while the water curtain sprayed by the lower spray gun onto the non-woven fabric forms an inverted triangle.

[0038] The inlet of the liquid supply pump is connected to the liquid preparation tank via a first pipeline, and the outlet of the liquid supply pump is connected to the distributor via a second pipeline. A return pipe connected to the second pipeline is connected to the liquid preparation tank, and a return valve is installed on the return pipe. Both the first main liquid supply pipe 31 and the second main liquid supply pipe 32 are connected to the distributor. The first crossbar 41 and / or the second crossbar can rotate around their own axis to adjust the angle of the sprayed liquid onto the fabric surface. Specifically, the liquid supply pump can be a centrifugal pump, the metering pump can be a gear pump, a filter can be installed on the first pipeline to filter the nonwoven fabric additive from the liquid preparation tank, and the distributor can be a three-way pipe.

[0039] It's easy to understand that the spraying device can achieve at least three working modes: top spraying mode, bottom spraying mode, and double-sided spraying mode. In top spraying mode, only the top spray gun works, and the bottom spray gun does not work, spraying the auxiliary agent only onto the top surface of the nonwoven fabric on the production line; in bottom spraying mode, only the bottom spray gun works, and the top spray gun does not work, spraying the auxiliary agent only onto the bottom surface of the nonwoven fabric on the production line; in double-sided spraying mode, both the top and bottom spray guns work, spraying the auxiliary agent onto both the top and bottom surfaces of the nonwoven fabric on the production line simultaneously.

[0040] In addition to adjusting the working mode, the distance between the nozzle and the nonwoven fabric can also be adjusted, such as... Figure 4 As shown, when the position of the second horizontal bar where the lower spray gun is located is raised, the distance H between the nozzle of the lower spray gun and the nonwoven fabric decreases; conversely, when the position of the second horizontal bar where the lower spray gun is located is lowered, the distance H between the nozzle of the lower spray gun and the nonwoven fabric increases. In addition to adjusting their height, the first horizontal bar 41 and the second horizontal bar can also rotate around their own axes to adjust the angle between the water curtain sprayed by the spray gun and the fabric surface.

[0041] Furthermore, the flow rate of the nonwoven fabric spraying system can be adjusted by controlling the supply pump and / or the return valve. For example, when the flow rate of the supply pump is constant, increasing the opening of the return valve can reduce the flow rate to the spraying device, and conversely, decreasing the opening of the return valve can increase the flow rate to the spraying device. As another example, when the opening of the return valve is constant, changing the flow rate of the supply pump through frequency conversion control technology will increase or decrease the flow rate to the spraying device accordingly.

[0042] Through the above-mentioned various adjustment methods and their combinations, the nonwoven fabric spraying system provided by this invention can better achieve high-precision, low-flow spraying operations compared with existing technologies, greatly meeting the actual production needs for flexible adjustment of additive addition schemes.

[0043] See Figure 8 In a preferred embodiment, the nonwoven fabric spraying system includes a mixer with one outlet and three inlets. The outlet of the mixer is connected to a mixing tank via a pipeline. The first inlet of the mixer is connected to a first auxiliary agent supply pipeline, the second inlet of the mixer is connected to a second auxiliary agent supply pipeline, and the third inlet of the mixer is connected to a water supply pipeline. Metering pumps are installed on both the first and second auxiliary agent supply pipelines. A flow meter is installed on the water supply pipeline. The upstream of the flow meter is connected to the upstream of the metering pump via a bypass pipeline. A solenoid valve (not shown in the figure) is installed on the bypass pipeline.

[0044] In the spray-on liquid-feeding mode, the nonwoven fabric spray system can accommodate the compounding of two auxiliaries. The auxiliaries flow into the mixer via a metering pump, and filtered water, after being metered by a flow meter, also flows into the mixer. The thoroughly mixed solution in the mixer enters the dispensing tank, and the prepared auxiliary solution in the dispensing tank is then sent to the spraying device via a supply pump. The spraying device can be configured for top spraying, bottom spraying, or double-sided spraying. In a preferred embodiment, a stirrer is installed in the dispensing tank to further mix the solution and prevent sedimentation.

[0045] In the cleaning spray operation mode, both the first and second auxiliary agent supply lines are closed upstream of the bypass line. Water is pumped into the mixer via a metering pump, and then the auxiliary agent solution flows in the same direction as in the spray-on operation mode. In a preferred embodiment, both the first and second auxiliary agent supply lines are equipped with electric valves, and the bypass line is connected in parallel to the line between the metering pump and the electric valves. Of course, in other embodiments, other types of valves can be installed on the first and second auxiliary agent supply lines to control the on / off state.

[0046] See Figure 7 In a preferred embodiment, the water curtains sprayed by adjacent spray guns are parallel to each other and form water curtain gaps. The water curtain gaps form a first angle β with the width direction of the nonwoven fabric. The first angle β is generally set to 2° to 10°. See also Figure 3 In this embodiment, the fan-shaped nozzle is connected to the spray gun body via a gap adjustment mechanism 9. The gap adjustment mechanism 9 is used to adjust the angle between the water curtain gap and the width direction of the nonwoven fabric. It is easy to understand that the gap adjustment mechanism 9 can cause the nozzle to twist at a certain angle relative to the spray gun body, thereby changing the size of the water curtain gap between adjacent spray guns and changing the angle between the water curtain gap and the width direction of the nonwoven fabric.

[0047] See Figure 1 and Figure 3 In a preferred embodiment, the position of the spray gun on the first crossbar 41 and / or the second crossbar is adjustable to change the distance between adjacent spray guns. Specifically, the nozzle spacing of spray guns in the same row is generally set to 200mm to 500mm. See also Figure 4 In a preferred embodiment, the spray range angle α of the nozzle is adjustable. It is easy to understand that the spray range angle α is the apex angle of the fan-shaped water curtain.

[0048] like Figures 1-3As shown, to facilitate the rotation of the first crossbar 41 and the second crossbar, a handwheel 5 is provided at the end of the crossbar in this embodiment. Of course, in other embodiments, an electric mechanism can also be provided to drive the crossbar, which can also rotate the crossbar. In this embodiment, the first liquid supply main pipe 31 and the second liquid supply main pipe 32 are both connected to the discharge pipe 6. In the cleaning spray working mode, the cleaning solution is discharged through the discharge pipe 6. In this embodiment, the spray gun is equipped with a micro cylinder 11 as the spray gun spray switch. When the micro cylinder 11 is pressurized, the pin of the micro cylinder 11 extends and seals the nozzle liquid supply hole, and the spray gun stops spraying liquid; when the micro cylinder 11 is depressurized, the pin of the micro cylinder 11 retracts, the nozzle liquid supply hole opens, and the spray gun sprays liquid normally. To supply air to the micro cylinder 11, the spraying device includes a first air supply main pipe 21 and a second air supply main pipe 22 fixed to the bracket 1, as shown in the figure. Figure 3 and Figure 6 As shown, the micro-cylinder 11 of the upper spray gun is connected to the first main air supply pipe 21 via the first air supply branch pipe 71, and the micro-cylinder 11 of the lower spray gun is connected to the second main air supply pipe 22 via the second air supply branch pipe 72. In a preferred embodiment, the first air supply branch pipe 71, the second air supply branch pipe 72, the first liquid supply branch pipe 81, and the second liquid supply branch pipe 82 are configured as flexible hoses, so that the horizontal position, height position, and spray angle relative to the fabric can be adjusted when the liquid supply pipe and the air supply pipe are fixed to the bracket 1. Of course, in other embodiments, the position and attitude adjustment requirements of the spray gun can also be met by configuring the liquid supply pipe and the air supply pipe to be movably connected to the bracket 1. Figure 3 As shown, in this embodiment, in order to adjust the spacing between adjacent spray guns, the upper spray gun is fixed on the first crossbar 41 by an adjustable locking member 10. Specifically, the locking member 10 can be set as a set screw.

[0049] Based on the nonwoven fabric spraying system of the present invention, the present invention also provides a control method for the nonwoven fabric spraying system, the control method comprising: opening the upper spray gun and closing the lower spray gun to enter the upper spraying mode; opening the lower spray gun and closing the upper spray gun to enter the lower spraying mode; and opening both the upper and lower spray guns to enter the double-sided spraying mode.

[0050] In a preferred embodiment, the control method includes: changing the liquid flow rate to the spray device by adjusting the frequency of the liquid supply pump, and / or changing the liquid flow rate to the spray device by adjusting the opening of the return valve. That is, the liquid flow rate to the spray device can be changed by controlling the flow rate of the liquid supply pump alone, or by controlling the opening of the return valve alone, or by combining the two methods together.

[0051] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0052] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A nonwoven fabric spraying system characterized by comprising: The device comprises a liquid preparation tank, a liquid supply pump and a spraying device, wherein the spraying device comprises: a support comprising vertical columns on both sides of the non-woven fabric in the width direction of the non-woven fabric; a first liquid supply main pipe horizontally arranged above the non-woven fabric and fixedly connected with the support; a second liquid supply main pipe horizontally arranged below the non-woven fabric and fixedly connected with the support; a first horizontal rod arranged above the non-woven fabric, both ends of the first horizontal rod being connected with the vertical columns and adjustable along the vertical columns to change the height of the first horizontal rod; a second horizontal rod arranged below the non-woven fabric, both ends of the second horizontal rod being connected with the vertical columns and adjustable along the vertical columns to change the height of the second horizontal rod; a plurality of spray guns, including upper spray guns arranged on a row of the first horizontal rod and lower spray guns arranged on the second horizontal rod, the upper spray guns being connected with the first liquid supply main pipe through first liquid supply branch pipes, the lower spray guns being connected with the second liquid supply main pipe through second liquid supply branch pipes, the spray guns having fan-shaped nozzles; wherein the first horizontal rod and / or the second horizontal rod can rotate around its own axis to adjust the angle of the sprayed liquid to the fabric surface, the first liquid supply main pipe and the second liquid supply main pipe are connected with a flow divider, the liquid inlet of the liquid supply pump is connected with the liquid preparation tank through a first pipeline, the liquid outlet of the liquid supply pump is connected with the flow divider through a second pipeline, a backflow pipe connected with the second pipeline is connected with the liquid preparation tank, and a backflow valve is arranged on the backflow pipe; water curtains sprayed by adjacent spray guns are parallel to each other and form water curtain gaps, and the water curtain gaps form a first included angle with the width direction of the non-woven fabric; the fan-shaped nozzles are connected with the bodies of the spray guns through a gap adjusting mechanism, and the gap adjusting mechanism is used to adjust the size of the first included angle; the positions of the spray guns on the first horizontal rod and / or the second horizontal rod are adjustable to change the distance between adjacent spray guns.

2. The nonwoven fabric spraying system according to claim 1, wherein The device comprises a mixer provided with one outlet and three inlets, the outlet of the mixer is connected with the liquid preparation tank through a pipeline, the first inlet of the mixer is connected with a first auxiliary agent supply pipeline, the second inlet of the mixer is connected with a second auxiliary agent supply pipeline, the third inlet of the mixer is connected with a water supply pipeline, a metering pump is arranged on the first auxiliary agent supply pipeline and the second auxiliary agent supply pipeline, a flow meter is arranged on the water supply pipeline, the upstream of the flow meter is connected with the upstream of the metering pump through a bypass pipeline, and an electromagnetic valve is arranged on the bypass pipeline.

3. The nonwoven fabric spraying system according to claim 2, wherein An electric valve is arranged on the first auxiliary agent supply pipeline and the second auxiliary agent supply pipeline, and the bypass pipeline is connected with the pipeline between the metering pump and the electric valve.

4. The nonwoven fabric spraying system according to claim 2, wherein A stirrer is arranged in the liquid preparation tank.

5. A control method of a nonwoven fabric spraying system, characterized by, The control method is performed on the non-woven fabric spraying system as claimed in any one of claims 1-4, and the control method comprises: opening the upper spray guns and closing the lower spray guns to enter an upper spraying mode; opening the lower spray guns and closing the upper spray guns to enter a lower spraying mode; opening the upper spray guns and the lower spray guns to enter a double-sided spraying mode.

6. The control method according to claim 5, characterized by The device comprises: adjusting the liquid flow to the spraying device by frequency conversion of the liquid supply pump.

7. The control method according to claim 6, characterized by The device comprises: The liquid flow to the sprinkler device is changed by adjusting the opening of the return valve.

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