A thickness detection device for non-woven fabric production

Abstract

The present invention provides a thickness detection device for non-woven fabric production, which includes a fabric feeding channel for conveying non-woven fabric, and further includes a first thickness detection component and a second thickness detection component; the first thickness detection component includes a nozzle and a charging electrode plate arranged on the first side of the fabric feeding channel, and a repelling electrode plate arranged on the second side of the fabric feeding channel. The nozzle is used for spraying colored droplets, the charging electrode plate is used for charging the droplets sprayed by the nozzle, and the repelling electrode plate is used for applying a repulsive force to the droplets sprayed by the nozzle; the second thickness detection component includes a liquid collecting cavity arranged on the first side of the fabric feeding channel, and an attracting electrode plate arranged on the second side of the fabric feeding channel. The liquid collecting cavity stores charged colored liquid, and a capillary hole is opened on the side of the liquid collecting cavity close to the fabric feeding channel. The attracting electrode plate is used for applying an attractive force to the colored liquid at the capillary hole. The present invention can detect the thickness of non-woven fabric and directly mark the detected part of the non-woven fabric according to the detection result.

Description

Technical Field

[0001] The present invention relates to the technical field of fabric thickness detection, and particularly to a thickness detection device for non-woven fabric production. Background Art

[0002] Non-woven fabric, also known as non-woven cloth, needle-punched cotton or needle-punched fabric. It is mainly made of materials such as cotton fiber, polyester fiber, and polyester fiber, and is processed by processes such as needling, hydroentangling, hot rolling or bonding, and finally made into fabrics with different thicknesses, hand feelings and hardnesses. After production, in order to ensure that the performance of the non-woven fabric meets the standards, key parameters such as thickness need to be detected. The detection methods of non-woven fabric can be simply divided into manual and automatic. With the improvement of productivity, the manual detection method has been gradually phased out. However, when the existing automatic detection equipment conducts detection, it cannot directly mark the detection part of the non-woven fabric according to the detection result. This makes it difficult for the staff to quickly identify the specific location of the defect, thus prolonging the time for subsequent processing of the non-woven fabric. Summary of the Invention

[0003] To overcome the deficiencies of the prior art, the present invention provides a thickness detection device for non-woven fabric production, which can detect the thickness of the non-woven fabric and directly mark the detection part of the non-woven fabric according to the detection result.

[0004] The present invention adopts the following technical solutions.

[0005] A thickness detection device for non-woven fabric production includes a fabric feeding channel for conveying non-woven fabric, and further includes a first thickness detection component and a second thickness detection component arranged in sequence along the fabric feeding direction of the fabric feeding channel;

[0006] The first thickness detection component includes a nozzle and a charging electrode plate arranged on the first side of the fabric feeding channel, and a repelling electrode plate arranged on the second side of the fabric feeding channel. The nozzle is used for spraying colored droplets, the charging electrode plate is used for charging the droplets sprayed by the nozzle, and the repelling electrode plate is used for applying a repulsive force to the droplets sprayed by the nozzle;

[0007] When the thickness of the non-woven fabric at the repelling electrode plate is greater than the first threshold, the droplets sprayed by the nozzle can overcome the repulsive force of the repelling electrode plate and reach the fabric feeding channel;

[0008] The second thickness detection component includes a liquid collecting cavity arranged on the first side of the fabric feeding channel, and an attracting electrode plate arranged on the second side of the fabric feeding channel. The liquid collecting cavity stores charged colored liquid, a capillary hole is opened on the side of the liquid collecting cavity close to the fabric feeding channel, and the attracting electrode plate is used for applying an attractive force to the colored liquid at the capillary hole;

[0009] When the thickness of the non-woven fabric at the attracting electrode plate is less than the second threshold, the colored liquid at the capillary hole forms droplets that reach the fabric feeding channel under the action of the attracting electrode plate.

[0010] Further, the first thickness detection component further includes a shunt module, and the shunt module is provided with a through hole, a first receiving chamber, and a second receiving chamber;

[0011] When the thickness of the non-woven fabric at the repelling electrode plate is greater than the first threshold, the droplets ejected by the nozzle can reach the cloth feeding channel through the through hole;

[0012] When the thickness of the non-woven fabric at the repelling electrode plate is greater than the second threshold and less than the first threshold, the droplets ejected by the nozzle enter the first receiving chamber under the action of the repelling electrode plate;

[0013] When the thickness of the non-woven fabric at the repelling electrode plate is less than the second threshold, the droplets ejected by the nozzle enter the second receiving chamber under the action of the repelling electrode plate.

[0014] Further, the first receiving chamber is connected to a liquid storage chamber through a first drain pipe, an ultrasonic oscillator is arranged in the liquid storage chamber, the nozzle is connected to the liquid storage chamber through a liquid supply pipe, a piezoelectric pump is arranged on the liquid supply pipe, the second receiving chamber is connected to a liquid collection chamber through a second drain pipe, and the liquid collection chamber is communicated with the liquid storage chamber through an overflow pipe;

[0015] Wherein, the time for the non-woven fabric to move from the repelling electrode plate to the attracting electrode plate along the cloth feeding channel is equal to or less than the time for the droplets to move from the second receiving chamber to the liquid collection chamber.

[0016] Further, the energization frequency of the attracting electrode plate is less than the energization frequency of the piezoelectric pump.

[0017] Further, a stepped mixing structure is arranged in the second receiving chamber, and the mixing structure is used for aggregating the dye particles in the droplets.

[0018] Further, the repelling electrode plate is inclined along the ray of the nozzle;

[0019] Under the action of the repelling electrode plate, the droplets ejected by the nozzle have a first inertial force pointing to the cloth feeding channel and a second inertial force extending along the cloth feeding direction of the cloth feeding channel;

[0020] An air knife is arranged on the first side of the cloth feeding channel, and the airflow generated by the air knife extends along the reverse direction of the cloth feeding direction of the cloth feeding channel, and it can offset the second inertial force of the droplets after passing through the through hole.

[0021] Further, a first light transmission compensation component is arranged near the repelling electrode plate;

[0022] The first light transmission compensation component includes a first piezoelectric stack, a first photoelectric conversion plate electrically connected to the first piezoelectric stack, and a first light source aligned with the first photoelectric conversion plate. The first light source is arranged on the first side of the fabric feeding channel, the first photoelectric conversion plate is arranged on the second side of the fabric feeding channel, and the first piezoelectric stack is integrally connected to the repelling electrode plate;

[0023] When the thickness of the non-woven fabric at the repelling electrode plate increases, the light intensity of the first light source irradiating the first photoelectric conversion plate decreases, the voltage generated by the first photoelectric conversion plate decreases, and the first piezoelectric stack drives the repelling electrode plate away from the fabric feeding channel.

[0024] Furthermore, a second light transmission compensation component is arranged near the attracting electrode plate;

[0025] The second light transmission compensation component includes a second piezoelectric stack, a second photoelectric conversion plate electrically connected to the second piezoelectric stack, and a second light source aligned with the second photoelectric conversion plate. The second light source is arranged on the first side of the fabric feeding channel, the second photoelectric conversion plate is arranged on the second side of the fabric feeding channel, and the second piezoelectric stack is integrally connected to the attracting electrode plate;

[0026] When the thickness of the non-woven fabric at the attracting electrode plate decreases, the light intensity of the second light source irradiating the second photoelectric conversion plate increases, the voltage generated by the second photoelectric conversion plate increases, and the second piezoelectric stack drives the attracting electrode plate close to the fabric feeding channel.

[0027] The beneficial effects of the present invention are as follows:

[0028] During operation, each part of the non-woven fabric passes through the first thickness detection component and the second thickness detection component in sequence along the fabric feeding channel. When the part of the non-woven fabric with a thickness greater than the first threshold reaches the repelling electrode plate, under the influence of this part, the droplets ejected by the nozzle are less affected by the repulsive force from the repelling electrode plate, and the droplets ejected by the nozzle can overcome the repulsive force of the repelling electrode plate and reach the fabric feeding channel, thereby dyeing the part located at the repelling electrode plate. Then, when the part of the non-woven fabric with a thickness less than the second threshold reaches the attracting electrode plate, under the influence of this part, the attractive force of the attracting electrode plate on the colored liquid at the capillary pores can overcome the liquid tension at the capillary pores, so that the colored liquid at the capillary pores forms droplets under the action of the attracting electrode plate and reaches the fabric feeding channel, dyeing the part located at the attracting electrode plate. Subsequently, the staff can quickly identify the defects according to the dyeing positions, thereby shortening the time for subsequent treatment of the non-woven fabric. Description of the Drawings

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 Structural schematic diagram of the first embodiment of the present invention;

[0031] Figure 2 Structural schematic diagram of the second embodiment of the present invention;

[0032] Figure 3 Structural schematic diagram of the third embodiment of the present invention;

[0033] Figure 4 Structural schematic diagram of the fourth embodiment of the present invention.

[0034] Description of reference numerals:

[0035] Feeding channel 1,

[0036] Nozzle 21, charging electrode plate 22, repelling electrode plate 23,

[0037] Liquid collecting chamber 31, capillary pores 311, attracting electrode plate 32,

[0038] Through hole 41, first receiving chamber 42, second receiving chamber 43, mixing structure 431,

[0039] First drain pipe 51, liquid storage chamber 52, ultrasonic oscillator 53, liquid supply pipe 54, piezoelectric pump 55, second drain pipe 56, overflow pipe 57,

[0040] Air knife 6,

[0041] First piezoelectric stack 71, first photoelectric conversion plate 72, first light source 73,

[0042] Second piezoelectric stack 81, second photoelectric conversion plate 82, second light source 83. Detailed implementation manners

[0043] The drawings are only for illustrative purposes and cannot be construed as a limitation of this patent; to better illustrate this embodiment, some components in the drawings may be omitted, enlarged or reduced, which does not represent the dimensions of the actual product.

[0044] For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The technical solutions of the present invention will be further described below with reference to the drawings and embodiments.

[0045] As shown in the atta Figures 1 to 4A thickness detection device for non-woven fabric production as shown, includes a fabric feeding channel 1 for conveying non-woven fabric, and also includes a first thickness detection component and a second thickness detection component arranged in sequence along the fabric feeding direction of the fabric feeding channel 1;

[0046] The first thickness detection component includes a nozzle 21 and a charging electrode plate 22 arranged on the first side of the fabric feeding channel 1, and a repelling electrode plate 23 arranged on the second side of the fabric feeding channel 1. The nozzle 21 is used for spraying colored droplets, the charging electrode plate 22 is used for making the droplets sprayed by the nozzle 21 charged, and the repelling electrode plate 23 is used for applying a repulsive force to the droplets sprayed by the nozzle 21;

[0047] When the thickness of the non-woven fabric at the repelling electrode plate 23 is greater than the first threshold value, the droplets sprayed by the nozzle 21 can overcome the repulsive force of the repelling electrode plate 23 and reach the fabric feeding channel 1;

[0048] The second thickness detection component includes a liquid collecting cavity 31 arranged on the first side of the fabric feeding channel 1, and an attracting electrode plate 32 arranged on the second side of the fabric feeding channel 1. The liquid collecting cavity 31 stores charged colored liquid. A capillary hole 311 is opened on the side of the liquid collecting cavity 31 close to the fabric feeding channel 1. The attracting electrode plate 32 is used for applying an attractive force to the colored liquid at the capillary hole 311;

[0049] When the thickness of the non-woven fabric at the attracting electrode plate 32 is less than the second threshold value, the colored liquid at the capillary hole 311 forms droplets that reach the fabric feeding channel 1 under the action of the attracting electrode plate 32.

[0050] Specifically, the charging electrode plate 22 makes the charge carried by the droplets the same as the charge carried by the repelling electrode plate 23. In this way, the repelling electrode plate 23 can generate a repulsive force on the droplets sprayed by the nozzle 21.

[0051] The charge carried by the colored liquid in the liquid collecting cavity 31 is the same as the charge carried by the repelling electrode plate 23. In this way, when the part of the non-woven fabric adhered with the droplets sprayed by the nozzle 21 moves to the attracting electrode plate 32, the charged droplets on this part will not attract the colored liquid at the capillary hole 311.

[0052] The charge carried by the attracting electrode plate 32 is opposite to the charge carried by the colored liquid in the liquid collecting cavity 31. In this way, the attracting electrode plate 32 can apply an attractive force to the colored liquid at the capillary hole 311.

[0053] For example, when the charging electrode plate 22 makes the droplets carry negative charges, the repelling electrode plate 23 carries negative charges, and the attracting electrode plate 32 carries positive charges. Vice versa.

[0054] During operation, each part of the non-woven fabric passes through the first thickness detection component and the second thickness detection component along the fabric feeding channel 1 in sequence. When a part of the non-woven fabric with a thickness greater than the first threshold reaches the repelling electrode plate 23, under the influence of this part, the repulsive force exerted on the droplets ejected by the nozzle 21 from the repelling electrode plate 23 decreases, and the droplets ejected by the nozzle 21 can overcome the repulsive force of the repelling electrode plate 23 and reach the fabric feeding channel 1 to dye this part located at the repelling electrode plate 23. Then, when a part of the non-woven fabric with a thickness less than the second threshold reaches the attracting electrode plate 32, under the influence of this part, the attracting force of the attracting electrode plate 32 on the colored liquid at the capillary pores 311 can overcome the liquid tension at the capillary pores 311, causing the colored liquid at the capillary pores 311 to form droplets under the action of the attracting electrode plate 32 and reach the fabric feeding channel 1 to dye this part located at the attracting electrode plate 32. Subsequently, the staff can quickly identify the defects based on the dyeing positions, thus shortening the time for subsequent processing of the non-woven fabric.

[0055] Preferably, the first thickness detection component further includes a flow splitting module, and the flow splitting module is provided with a through hole 41, a first receiving chamber 42, and a second receiving chamber 43;

[0056] When the thickness of the non-woven fabric at the repelling electrode plate 23 is greater than the first threshold, the droplets ejected by the nozzle 21 can reach the fabric feeding channel 1 through the through hole 41;

[0057] When the thickness of the non-woven fabric at the repelling electrode plate 23 is greater than the second threshold and less than the first threshold, the droplets ejected by the nozzle 21 enter the first receiving chamber 42 under the action of the repelling electrode plate 23;

[0058] When the thickness of the non-woven fabric at the repelling electrode plate 23 is less than the second threshold, the droplets ejected by the nozzle 21 enter the second receiving chamber 43 under the action of the repelling electrode plate 23.

[0059] Preferably, the first receiving chamber 42 is connected to a liquid storage chamber 52 through a first drain pipe 51. An ultrasonic oscillator 53 is provided in the liquid storage chamber 52. The nozzle 21 is connected to the liquid storage chamber 52 through a liquid supply pipe 54, and a piezoelectric pump 55 is provided on the liquid supply pipe 54. The second receiving chamber 43 is connected to the liquid collection chamber 31 through a second drain pipe 56, and the liquid collection chamber 31 is communicated with the liquid storage chamber 52 through an overflow pipe 57;

[0060] Wherein, the time for the non-woven fabric to move from the repelling electrode plate 23 to the attracting electrode plate 32 along the fabric feeding channel 1 is equal to or less than the time for the droplets to move from the second receiving chamber 43 to the liquid collection chamber 31.

[0061] When the thickness of the non-woven fabric at the position of the repelling electrode plate 23 is greater than the second threshold value and less than the first threshold value, the repulsive force of the repelling electrode plate 23 on the droplets ejected by the nozzle 21 is greater than the second preset value and less than the first preset value. In this way, under the action of the repelling electrode plate 23, the droplets ejected by the nozzle 21 enter the first receiving chamber 42, and then enter the liquid storage chamber 52 through the first drain pipe 51. The ultrasonic oscillator 53 is used to prevent the aggregation of dye particles in the color liquid in the liquid storage chamber 52, so that the dye particles in the color liquid in the liquid storage chamber 52 are evenly distributed. Subsequently, under the action of the piezoelectric pump 55, the color liquid in the liquid storage chamber 52 re-enters the nozzle 21 and is ejected in the form of droplets according to the energization frequency of the piezoelectric pump 55.

[0062] When the thickness of the non-woven fabric at the position of the repelling electrode plate 23 is greater than the first threshold value, the repulsive force of the repelling electrode plate 23 on the droplets ejected by the nozzle 21 is less than the second preset value. In this way, under the action of the repelling electrode plate 23, the droplets ejected by the nozzle 21 reach the fabric feeding channel 1 through the through hole 41, and dye the part at the position of the repelling electrode plate 23, forming color dots on this part.

[0063] When the thickness of the non-woven fabric at the position of the repelling electrode plate 23 is less than the second threshold value, the repulsive force of the repelling electrode plate 23 on the droplets ejected by the nozzle 21 is greater than the first preset value. In this way, under the action of the repelling electrode plate 23, the droplets ejected by the nozzle 21 enter the second receiving chamber 43, and then enter the liquid collecting chamber 31 through the second drain pipe 56. Based on the time that the non-woven fabric moves from the position of the repelling electrode plate 23 to the attracting electrode plate 32 is equal to or less than the time that the droplets move from the second receiving chamber 43 to the liquid collecting chamber 31. Subsequently, when the part with a thickness less than the second threshold value reaches the attracting electrode plate 32, the attractive force of the attracting electrode plate 32 on the color liquid at the capillary hole 311 can overcome the liquid tension at the capillary hole 311, so that the color liquid at the capillary hole 311 forms droplets under the action of the attracting electrode plate 32 and reaches the fabric feeding channel 1, dyeing the part at the position of the attracting electrode plate 32 and forming color dots on this part.

[0064] As shown in the appendix Figure 1 and 4 shown, preferably, the energization frequency of the attracting electrode plate 32 is less than the energization frequency of the piezoelectric pump 55. In this way, the color dot density of the part of the non-woven fabric with a thickness greater than the first threshold value is larger and the color is deeper; the color dot density of the part with a thickness less than the second threshold value is smaller and the color is lighter, which is conducive to the staff quickly identifying the defect type according to the dyeing depth.

[0065] As shown in the appendix Figure 2 and 3As shown, preferably, a stepped flow mixing structure 431 is provided in the second receiving chamber 43, and the flow mixing structure 431 is used to cause the dye particles in the droplets to aggregate. It can be understood that in the droplets ejected by the ejection device, the distribution of the dye particles is relatively uniform. When the droplets ejected by the nozzle 21 directly adhere to the non-woven fabric through the through hole 41, in view of the fact that the droplets are not additionally disturbed, the color difference of the color dots formed by the droplets will be relatively small. However, if the droplets ejected by the nozzle 21 first pass through the second receiving chamber 43 and then enter the liquid collecting chamber 31, the flow mixing structure 431 in the second receiving chamber 43 will cause turbulence in the passing droplets, thereby causing the dye particles in the droplets to collide. During the collision process, the binding force between the dye particles will overcome the charge repulsion force they carry themselves, resulting in the aggregation of the dye particles. When the colored liquid in the liquid collecting chamber 31 forms droplets and adheres to the non-woven fabric through the capillary holes 311, in view of the aggregation of the dye particles, the color difference of the color dots formed by the droplets will be relatively large. Based on this principle, for the part of the non-woven fabric where the thickness is greater than the first threshold, the color difference of the color dots will be relatively small; while for the part where the thickness is less than the second threshold, the color difference of the color dots will be relatively large. This is beneficial for the staff to quickly identify the type of defect on the non-woven fabric according to the color difference of the color dots.

[0066] Preferably, the repelling electrode plate 23 is inclined along the ray of the nozzle 21;

[0067] Under the action of the repelling electrode plate 23, the droplets ejected by the nozzle 21 have a first inertial force pointing to the feeding channel 1 and a second inertial force extending along the feeding direction of the feeding channel 1;

[0068] When the thickness of the part of the non-woven fabric at the position of the repelling electrode plate 23 is greater than the first threshold, if the droplets ejected by the nozzle 21 are only affected by the air resistance and the repelling force of the repelling electrode plate 23, the movement trajectory of the droplets will be as shown by the trajectory line A in the attachment Figure 3 , resulting in a deviation between the actual landing position on the non-woven fabric and the part with a thickness greater than the first threshold. To solve this problem, an air knife 6 is provided on the first side of the feeding channel 1. The airflow generated by the air knife 6 extends against the feeding direction of the feeding channel 1, and it can offset the second inertial force of the droplets after passing through the through hole 41, so that the actual landing position of the droplets after passing through the through hole 41 on the non-woven fabric is as close as possible to the part with a thickness greater than the first threshold. In addition, the airflow generated by the air knife 6 can also blow away the dust on the non-woven fabric, thereby reducing the influence of the dust on the detection result.

[0069] It can be understood that in some occasions with special requirements for the performance of the non-woven fabric, the following parts need to be regarded as defective parts: parts with extremely large or extremely small thickness, parts with relatively large thickness and poor light transmittance (which means extremely poor permeability of this part), and parts with relatively small thickness and good light transmittance (which means extremely poor strength of this part).

[0070] To consider the influence of the light transmittance of the non-woven fabric, as shown in Figure 3 and 4 shown, preferably, a first light transmission compensation component is provided near the repelling electrode plate 23; the first light transmission compensation component includes a first piezoelectric stack 71, a first photoelectric conversion plate 72 electrically connected to the first piezoelectric stack 71, and a first light source 73 aligned with the first photoelectric conversion plate 72. The first light source 73 is provided on the first side of the fabric feeding channel 1, the first photoelectric conversion plate 72 is provided on the second side of the fabric feeding channel 1, and the first piezoelectric stack 71 is integrally connected to the repelling electrode plate 23;

[0071] When the thickness of the non-woven fabric at the repelling electrode plate 23 increases, the light intensity of the first light source 73 irradiating the first photoelectric conversion plate 72 decreases, the voltage generated by the first photoelectric conversion plate 72 decreases, and the first piezoelectric stack 71 drives the repelling electrode plate 23 away from the fabric feeding channel 1.

[0072] Preferably, a second light transmission compensation component is provided near the attracting electrode plate 32; the second light transmission compensation component includes a second piezoelectric stack 81, a second photoelectric conversion plate 82 electrically connected to the second piezoelectric stack 81, and a second light source 83 aligned with the second photoelectric conversion plate 82. The second light source 83 is provided on the first side of the fabric feeding channel 1, the second photoelectric conversion plate 82 is provided on the second side of the fabric feeding channel 1, and the second piezoelectric stack 81 is integrally connected to the attracting electrode plate 32;

[0073] When the thickness of the non-woven fabric at the attracting electrode plate 32 decreases, the light intensity of the second light source 83 irradiating the second photoelectric conversion plate 82 increases, the voltage generated by the second photoelectric conversion plate 82 increases, and the second piezoelectric stack 81 drives the attracting electrode plate 32 closer to the fabric feeding channel 1.

[0074] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, 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 thickness detection device for nonwoven fabric production, comprising a fabric feeding channel for conveying nonwoven fabric, characterized in that: It also includes a first thickness detection component and a second thickness detection component which are sequentially arranged along the cloth feeding direction of the cloth feeding channel; The first thickness detection assembly includes a nozzle and a charging plate disposed on a first side of the cloth feeding channel, and a repelling plate disposed on a second side of the cloth feeding channel, the nozzle is used to spray colored droplets, the charging plate is used to charge the droplets sprayed by the nozzle, and the repelling plate is used to apply a repelling force to the droplets sprayed by the nozzle; When the thickness of the non-woven fabric at the repelling electrode is greater than a first threshold, the droplets sprayed by the nozzle can overcome the repelling force of the repelling electrode and reach the fabric feeding channel; The second thickness detection component includes a liquid collecting chamber provided on a first side of the cloth feeding channel, and an attraction electrode provided on a second side of the cloth feeding channel, wherein the liquid collecting chamber stores charged color liquid, and a capillary hole is provided on a side of the liquid collecting chamber close to the cloth feeding channel, and the attraction electrode is used to apply attraction to the color liquid at the capillary hole; When the thickness of the nonwoven fabric at the attraction electrode is less than the second threshold value, the color liquid at the capillary pores forms droplets reaching the cloth feeding channel under the action of the attraction electrode.

2. A thickness detection device for nonwoven fabric production according to claim 1, characterized in that: The first thickness detection assembly further includes a flow diversion module, the flow diversion module is provided with a through hole, a first receiving chamber and a second receiving chamber; When the thickness of the nonwoven fabric at the repelling plate is greater than a first threshold value, the droplets sprayed by the nozzle can pass through the through hole to reach the fabric feeding channel; When the thickness of the nonwoven fabric at the repelling plate is greater than the second threshold value and less than the first threshold value, the droplets sprayed by the nozzle enter the first receiving chamber under the action of the repelling plate; When the thickness of the non-woven fabric at the repelling plate is less than the second threshold value, the droplets sprayed by the nozzle enter the second receiving chamber under the action of the repelling plate.

3. A thickness detection device for nonwoven fabric production according to claim 2, characterized in that: The first receiving chamber is connected to a liquid storage chamber through a first liquid discharge pipe, an ultrasonic oscillator is arranged in the liquid storage chamber, the nozzle is connected to the liquid storage chamber through a liquid supply pipe, a piezoelectric pump is arranged on the liquid supply pipe, the second receiving chamber is connected to a liquid collecting chamber through a second liquid discharge pipe, and the liquid collecting chamber is connected to the liquid storage chamber through an overflow pipe; The time for the non-woven fabric to move from the repelling electrode to the attracting electrode along the fabric feeding channel is equal to or less than the time for the droplets to move from the second receiving chamber to the liquid collecting chamber.

4. A thickness detection device for nonwoven fabric production according to claim 3, characterized in that: The energizing frequency of the attraction electrode is lower than the energizing frequency of the piezoelectric pump.

5. A thickness detection device for nonwoven fabric production according to claim 3, characterized in that: A stepped flow mixing structure is provided in the second receiving chamber, and the flow mixing structure is used to aggregate the dye particles in the droplets.

6. A thickness detection device for nonwoven fabric production according to claim 2, characterized in that: The repelling plate is arranged obliquely along the ray of the nozzle; Under the action of the repelling plate, the droplets sprayed by the nozzle have a first inertial force pointing to the cloth feeding channel, and a second inertial force extending along the cloth feeding direction of the cloth feeding channel; A wind knife is provided on the first side of the cloth feeding channel. The airflow generated by the wind knife extends in the opposite direction of the cloth feeding channel, and can offset the second inertia force of the droplets after passing through the through hole.

7. A thickness detection device for nonwoven fabric production according to claim 1, characterized in that: A first light-transmitting compensation component is provided near the repelling electrode plate; The first light transmission compensation component includes a first piezoelectric stack, a first photoelectric conversion plate electrically connected to the first piezoelectric stack, and a first light source aligned with the first photoelectric conversion plate, the first light source is arranged on a first side of the cloth feeding channel, the first photoelectric conversion plate is arranged on a second side of the cloth feeding channel, and the first piezoelectric stack is integrally connected to the repelling electrode plate; When the thickness of the nonwoven fabric at the repelling plate increases, the light intensity of the first light source irradiating the first photoelectric conversion plate decreases, the voltage generated by the first photoelectric conversion plate decreases, and the first piezoelectric stack drives the repelling plate away from the cloth feeding channel.

8. A thickness detection device for nonwoven fabric production according to claim 1, characterized in that: A second light-transmitting compensation component is provided near the attracting electrode plate; The second light transmission compensation component includes a second piezoelectric stack, a second photoelectric conversion plate electrically connected to the second piezoelectric stack, and a second light source aligned with the second photoelectric conversion plate, the second light source is arranged on a first side of the cloth feeding channel, the second photoelectric conversion plate is arranged on a second side of the cloth feeding channel, and the second piezoelectric stack is integrally connected to the attracting electrode plate; When the thickness of the non-woven fabric at the attraction electrode plate decreases, the light intensity of the second light source irradiating the second photoelectric conversion plate increases, the voltage generated by the second photoelectric conversion plate increases, and the second piezoelectric stack drives the attraction electrode plate to approach the cloth feeding channel.

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