Thickness detection device for non-woven fabric production

Abstract

The invention provides a thickness detection device for non-woven fabric production, which comprises a fabric conveying channel for conveying non-woven fabric, and further comprises a first thickness detection assembly and a second thickness detection assembly, the first thickness detection assembly comprises a nozzle and a charging pole plate which are arranged on the first side of the cloth feeding channel and a repelling pole plate arranged on the second side of the cloth feeding channel, the nozzle is used for spraying colored liquid drops, the charging pole plate is used for electrifying the liquid drops sprayed by the nozzle, and the repelling pole plate is used for applying repulsive force to the liquid drops sprayed by the nozzle; the second thickness detection assembly comprises a liquid collection cavity formed in the first side of the cloth feeding channel and an attraction pole plate arranged on the second side of the cloth feeding channel, charged color liquid is stored in the liquid collection cavity, capillary holes are formed in the side, close to the cloth feeding channel, of the liquid collection cavity, and the attraction pole plate is used for applying attraction force to the color liquid at the capillary holes. According to the non-woven fabric thickness detection device, the thickness of the non-woven fabric can be detected, and the detection part of the non-woven fabric can be directly marked according to the detection result.

Description

Technical Field

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

[0002] Non-woven fabrics, also known as non-woven fabrics, needle-punched cotton or needle-punched fabrics. They are mainly made of cotton fibers, polyester fibers, polyester fibers and other materials, and are processed by needle punching, spunlace, hot rolling or bonding, and finally made into fabrics with different thickness, feel and hardness. After production is completed, in order to ensure that the performance of non-woven fabrics meets the standards, its key parameters, such as thickness, need to be tested. The detection methods of non-woven fabrics can be simply divided into manual and automatic. With the improvement of productivity, manual detection methods have been gradually eliminated. However, the existing automatic detection equipment cannot directly mark the detection parts of non-woven fabrics according to the test results during the detection. This makes it difficult for staff to quickly identify the specific location of the defect, thereby prolonging the time for subsequent processing of non-woven fabrics. Summary of the invention

[0003] In order 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 position 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, comprising a fabric feeding channel for conveying non-woven fabric, and also comprising a first thickness detection component and a second thickness detection component sequentially arranged along the fabric feeding direction of the fabric feeding channel;

[0006] 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;

[0007] 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;

[0008] 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;

[0009] 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.

[0010] Furthermore, 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;

[0011] 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;

[0012] 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;

[0013] 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.

[0014] Furthermore, 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 collection chamber through a second liquid discharge pipe, and the liquid collection chamber is connected to the liquid storage chamber through an overflow pipe;

[0015] 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.

[0016] Furthermore, the power-on frequency of the attraction electrode is lower than the power-on frequency of the piezoelectric pump.

[0017] Furthermore, a stepped mixing flow structure is provided in the second receiving chamber, and the mixing flow structure is used to aggregate the dye particles in the droplets.

[0018] Further, the repelling plate is arranged obliquely along the ray of the nozzle;

[0019] 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;

[0020] 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.

[0021] Furthermore, a first light-transmitting compensation component is provided near the repelling 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 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;

[0023] 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.

[0024] Furthermore, a second light transmission compensation component is provided near the attraction 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 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;

[0026] 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.

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

[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 cloth feeding channel. When the part of the non-woven fabric whose thickness is greater than the first threshold reaches the repelling electrode, under the influence of this part, the droplets sprayed by the nozzle are reduced by the repulsive force from the repelling electrode, and the droplets sprayed by the nozzle can overcome the repulsive force of the repelling electrode and reach the cloth feeding channel, thereby dyeing the part located at the repelling electrode. Next, when the part of the non-woven fabric whose thickness is less than the second threshold reaches the attracting electrode, under the influence of this part, the attraction of the attracting electrode to the color liquid at the capillary pores can overcome the liquid tension at the capillary pores, so that the color liquid at the capillary pores forms droplets under the action of the attracting electrode and reaches the cloth feeding channel, dyeing the part located at the attracting electrode. Subsequently, the staff can quickly identify the defects according to the dyeing position, thereby shortening the time for subsequent processing of the non-woven fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a structural schematic diagram of the first embodiment of the present invention;

[0031] Figure 2 is a schematic structural diagram of a second embodiment of the present invention;

[0032] Figure 3 is a schematic structural diagram of a third embodiment of the present invention;

[0033] Figure 4 FIG. 4 is a schematic structural diagram of a fourth embodiment of the present invention.

[0034] Description of reference numerals:

[0035] Feed channel 1,

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

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

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

[0039] A first liquid discharge pipe 51, a liquid storage chamber 52, an ultrasonic oscillator 53, a liquid supply pipe 54, a piezoelectric pump 55, a second liquid discharge pipe 56, an overflow pipe 57,

[0040] Wind Knife 6,

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

[0042] A second piezoelectric stack 81 , a second photoelectric conversion plate 82 , and a second light source 83 . DETAILED DESCRIPTION

[0043] The drawings are only used for illustrative purposes and should not be construed as limitations of this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product.

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

[0045] As attached Figures 1 to 4A thickness detection device for non-woven fabric production 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 sequentially arranged along the fabric feeding direction of the fabric feeding channel 1;

[0046] The first thickness detection assembly includes a nozzle 21 and a charging plate 22 disposed on a first side of the cloth feeding channel 1, and a repelling plate 23 disposed on a second side of the cloth feeding channel 1, the nozzle 21 is used to spray colored droplets, the charging plate 22 is used to charge the droplets sprayed by the nozzle 21, and the repelling plate 23 is used to apply a repelling force to the droplets sprayed by the nozzle 21;

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

[0048] The second thickness detection assembly includes a liquid collecting chamber 31 disposed on a first side of the cloth feeding channel 1, and an attraction electrode plate 32 disposed on a second side of the cloth feeding channel 1. The liquid collecting chamber 31 stores charged color liquid. A capillary pore 311 is provided on a side of the liquid collecting chamber 31 close to the cloth feeding channel 1. The attraction electrode plate 32 is used to apply attraction to the color liquid at the capillary pore 311.

[0049] When the thickness of the nonwoven fabric at the attraction electrode 32 is less than the second threshold value, the color liquid at the capillary pores 311 forms droplets reaching the cloth feeding channel 1 under the action of the attraction electrode 32 .

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

[0051] The charge of the color liquid in the liquid collecting chamber 31 is the same as the charge of the repelling electrode 23. Thus, when the portion of the nonwoven fabric where the droplets sprayed by the nozzle 21 are attached moves to the attracting electrode 32, the charged droplets on this portion will not attract the color liquid at the capillary pores 311.

[0052] The charge carried by the attracting electrode plate 32 is opposite to the charge carried by the color liquid in the liquid collecting chamber 31. In this way, the attracting electrode plate 32 can exert an attractive force on the color liquid at the capillary pores 311.

[0053] For example, when the charging plate 22 makes the droplets negatively charged, the repelling plate 23 is negatively charged and the attracting plate 32 is positively charged.

[0054] During operation, each part of the nonwoven fabric passes through the first thickness detection component and the second thickness detection component in sequence along the cloth feeding channel 1. When the part of the nonwoven fabric with a thickness greater than the first threshold reaches the repelling electrode 23, under the influence of this part, the droplets sprayed by the nozzle 21 are reduced by the repulsive force from the repelling electrode 23, and the droplets sprayed by the nozzle 21 can overcome the repulsive force of the repelling electrode 23 to reach the cloth feeding channel 1, and dye the part located at the repelling electrode 23. Then, when the part of the nonwoven fabric with a thickness less than the second threshold reaches the attracting electrode 32, under the influence of this part, the attraction of the attracting electrode 32 to the color liquid at the capillary 311 can overcome the liquid tension at the capillary 311, so that the color liquid at the capillary 311 forms droplets under the action of the attracting electrode 32 and reaches the cloth feeding channel 1, and dyes the part located at the attracting electrode 32. In the follow-up, the staff can quickly identify the defects according to the dyeing position, thereby shortening the time for subsequent processing of the nonwoven fabric.

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

[0056] When the thickness of the nonwoven fabric at the repelling plate 23 is greater than the first threshold, the droplets sprayed by the nozzle 21 can pass through the through hole 41 to reach the fabric feeding channel 1;

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

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

[0059] Preferably, the first receiving chamber 42 is connected to a liquid storage chamber 52 through a first liquid discharge 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, 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 liquid discharge pipe 56, and the liquid collection chamber 31 is connected to the liquid storage chamber 52 through an overflow pipe 57;

[0060] The time for the nonwoven fabric to move from the repelling electrode 23 to the attracting electrode 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 collecting chamber 31 .

[0061] When the thickness of the nonwoven fabric at the repelling electrode 23 is greater than the second threshold value and less than the first threshold value, the repelling force of the repelling electrode 23 on the droplets sprayed 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 23, the droplets sprayed by the nozzle 21 enter the first receiving chamber 42, and then enter the liquid storage chamber 52 through the first liquid discharge pipe 51. The ultrasonic oscillator 53 is used to prevent the color liquid in the liquid storage chamber 52 from agglomerating dye particles, so that the dye particles of 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 sprayed out in the form of droplets according to the power-on frequency of the piezoelectric pump 55.

[0062] When the thickness of the nonwoven fabric at the repelling electrode 23 is greater than the first threshold, the repelling force of the repelling electrode 23 on the droplets sprayed by the nozzle 21 is less than the second preset value. In this way, under the action of the repelling electrode 23, the droplets sprayed by the nozzle 21 pass through the through hole 41 to reach the cloth feeding channel 1, dyeing the part at the repelling electrode 23 and forming color dots on the part.

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

[0064] As attached Figure 1 and 4 As shown, preferably, the energizing frequency of the attracting electrode 32 is less than the energizing frequency of the piezoelectric pump 55. In this way, the color point density of the part where the thickness of the non-woven fabric is greater than the first threshold is larger and the color is darker; the color point density of the part where the thickness is less than the second threshold is smaller and the color is lighter, which is conducive to the staff to quickly identify the defect type according to the dyeing depth.

[0065] As attached Figure 2 and 3As shown, preferably, a stepped mixed flow structure 431 is provided in the second receiving chamber 43, and the mixed flow structure 431 is used to aggregate the dye particles in the droplets. It can be understood that the distribution of the dye particles in the droplets sprayed by the spraying device is relatively uniform. When the droplets sprayed by the nozzle 21 directly adhere to the non-woven fabric through the through hole 41, the color difference of the color point formed by the droplet will be smaller in view of the droplet without additional disturbance. However, if the droplets sprayed by the nozzle 21 first pass through the second receiving chamber 43 and then enter the liquid collecting chamber 31, the mixed flow structure 431 in the second receiving chamber 43 will cause the droplets in the path to produce turbulence, thereby causing the dye particles in the droplets to collide. In the collision process, the bonding force between the dye particles will overcome the charge repulsion they carry themselves, resulting in the aggregation of the dye particles. When the color liquid in the liquid collecting chamber 31 forms a droplet and adheres to the non-woven fabric through the capillary 311, the color difference of the color point formed by the droplet will be larger in view of the aggregation of the dye particles. Based on this principle, for the parts of the non-woven fabric whose thickness is greater than the first threshold, the color difference of the color point will be smaller; while for the parts whose thickness is less than the second threshold, the color difference of the color point will be larger. This helps the staff to quickly identify the defect type on the non-woven fabric according to the color difference of the color point.

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

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

[0068] When the thickness of the nonwoven fabric at the repelling plate 23 is greater than the first threshold, if the droplets sprayed by the nozzle 21 are only affected by the air resistance and the repulsive force of the repelling plate 23, the movement trajectory of the droplets will be as shown in the following figure. Figure 3 As shown by the trajectory line A, there is 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, a wind knife 6 is provided on the first side of the cloth feeding channel 1. The airflow generated by the wind knife 6 extends in the opposite direction of the cloth feeding channel 1, which can offset the second inertia 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 wind knife 6 can also blow away the dust on the non-woven fabric, thereby reducing the influence of dust on the detection results.

[0069] It is understandable that in some occasions where there are special requirements for the performance of non-woven fabrics, the following parts need to be regarded as defective parts: parts with extremely large or small thickness, parts with large thickness and poor light transmittance (meaning that the permeability of this part is extremely poor), and parts with small thickness and good light transmittance (meaning that the strength of this part is extremely poor).

[0070] In order to consider the influence of the light transmittance of non-woven fabrics, Figure 3 and 4 As shown, preferably, a first light-transmitting compensation component is provided near the repelling electrode 23; the first light-transmitting 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 a first side of the cloth feeding channel 1, the first photoelectric conversion plate 72 is provided on a second side of the cloth feeding channel 1, and the first piezoelectric stack 71 is integrally connected to the repelling electrode 23;

[0071] When the thickness of the nonwoven fabric at the repelling 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 plate 23 away from the cloth feeding channel 1.

[0072] Preferably, a second light-transmitting compensation component is provided near the attracting electrode plate 32; the second light-transmitting 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 cloth feeding channel 1, the second photoelectric conversion plate 82 is provided on the second side of the cloth 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 attraction 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 attraction plate 32 to approach the cloth feeding channel 1.

[0074] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should 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; 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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