Air curtain type device for protecting sensor and impregnation machine applying air curtain type device

Abstract

The invention provides a gas curtain type device for protecting a sensor. The gas curtain type device comprises a shell, the sensor and a compressed gas inlet. The housing includes an outward opening. The sensor is arranged in the shell and used for emitting light to the outside of the shell through the opening. The compressed air inlet is formed in the shell and used for introducing compressed air into the shell from the outside of the shell. The compressed air leaves the shell through the opening in the same direction as the light emitted by the sensor, so that an air curtain used for protecting the sensor is formed between the sensor and the opening. The invention further provides an impregnation machine using the air curtain type device.

Description

Technical Field

[0001] The invention relates to an air curtain device for protecting a sensor, in particular to an air curtain device for protecting a sensor for detecting whether a cloth conveyed by an impregnation machine is broken. Background Art

[0002] In the field of impregnation machines for soaking cloth in viscose, the distance between two rollers is used to adjust the thickness of the cloth after being soaked in viscose. However, while taking into account the production efficiency of the cloth conveying speed, the cloth that is tensioned during the conveying process may break due to excessive tension or excessive friction between the two rollers. After the soaking step, this industry usually uses infrared sensors to detect whether the cloth is broken, so as to stop the conveying before entering the oven drying step to deal with the cloth breakage. In the current technical field, contrast infrared light sources or one-way comparison infrared light sources are usually used. However, whether it is a contrast infrared light source or a one-way comparison infrared light source, its mounting frame is mostly fixed. When cleaning and maintenance are required, many inconveniences are caused due to the obstruction of the machine. In addition, the working area of ​​the impregnation machine is an operating area full of flammable organic solvents, which belongs to an explosion-proof area. In the art, the infrared light source of the sensor is usually directly placed on the machine, which may be a public safety hazard; and the light emitting or detecting light part of the sensor is mostly made of plastic material, which has poor durability. In the face of such an environment full of flammable solvents, the light emitting source or detecting light part often causes atomization and damage.

[0003] In the technical field, glass has been used as a shield for the light source or detection light of the sensor to avoid fogging and damage. However, the glass may still be dirty during the operation, resulting in loss of the light source or failure of the detection light. Moreover, the refractive properties of the glass will also affect the irradiation of infrared rays, resulting in reduced accuracy of the sensor. If an organic solvent is used to wipe the glass, the solvent may remain on the glass and leave static electricity, which may cause additional safety problems in the operating environment.

[0004] In this regard, the technical field urgently needs a solution to the above problems. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an air curtain device for protecting a sensor, comprising: a shell, which includes an outward opening; a sensor, which is arranged in the shell and is used to radiate light to the outside of the shell through the opening; and a compressed air inlet, which is formed in the shell and is used to introduce compressed air from the outside of the shell into the shell; wherein the compressed air leaves the shell through the opening along the same direction as the light radiated by the sensor, so that an air curtain for protecting the sensor is formed between the sensor and the opening.

[0006] In the air curtain device provided by the present invention, an accommodating channel is formed in the shell for accommodating the sensor.

[0007] In the air curtain device provided by the present invention, an inlet channel connected to the fluid of the accommodating channel is formed in the shell; and the compressed air enters the accommodating channel along the inlet channel after passing through the compressed air inlet.

[0008] In the air curtain device provided by the present invention, the accommodating channel and the inlet channel extend in directions perpendicular to each other.

[0009] The air curtain device provided by the present invention further comprises at least one fixing member, which is used to pass through the shell and abut against the sensor so that the sensor can be fixed in the shell.

[0010] In the air curtain device provided by the present invention, the sensor includes a connecting wire, and the connecting wire electrically connects the sensor and an external device.

[0011] The present invention further provides an impregnation machine for soaking cloth in viscose, which comprises: two rollers, used to make the cloth pass through the gap between the two rollers after the cloth is soaked in viscose, so as to control the amount of viscose on the cloth; a main bracket, the two rollers are rollingly connected to the bracket; a mounting frame, which is connected to the main bracket, and at least one air curtain device as described above is arranged in the mounting frame. When the mounting frame is in the working position, the air curtain device is used to detect whether the cloth is broken.

[0012] In the impregnation machine provided by the present invention, the mounting frame is connected to the support via at least one cylinder, and the at least one cylinder enables the mounting frame to move between the working position and the cleaning position relative to the main support.

[0013] In the impregnation machine provided by the present invention, the mounting frame includes a shield and an opening and closing cover, and the opening and closing cover can be pivoted relative to the shield between an open position and a closed position.

[0014] The impregnation machine provided by the present invention comprises a plurality of air curtain devices, wherein the interval between two adjacent ones of the plurality of air curtain devices is between 100 mm and 150 mm.

[0015] One of the beneficial effects of the present invention is that the air curtain device provided by the present invention can prevent organic solvents in the working environment from adhering to the sensor, so that after the sensor has been operating for a period of time, there is no need to specially clean any parts contaminated by organic solvents; the sensor also does not need to be additionally provided with a cover such as glass to prevent contamination, so as to avoid the glass affecting the accuracy of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0017] Figure 1A FIG. 4 is an exemplary top view of an impregnation machine according to an embodiment of the present invention.

[0018] Figure 1B FIG. 4 is an exemplary front view of an impregnation machine according to an embodiment of the present invention.

[0019] Figure 1C FIG. 4 is an exemplary side view of an impregnation machine according to an embodiment of the present invention.

[0020] Figure 2A FIG. 4 is an exemplary side view of an air curtain device in an impregnation machine according to an embodiment of the present invention in a working position.

[0021] Figure 2B FIG. 1 is an exemplary side view of an air curtain device in an impregnation machine according to an embodiment of the present invention in a cleaning position.

[0022] Figure 3 FIG. 4 is an exemplary side view of an air curtain device according to an embodiment of the present invention.

[0023] Figure 4 FIG. 1 is an exemplary side view of a mounting bracket in an open position according to an embodiment of the present invention.

[0024] Figure numerals: 1. first roller, 2. second roller, 3. main bracket, 31. first cylinder, 32. second cylinder, 33. horizontal bracket, 34. vertical bracket, 4. mounting bracket, 41. cover, 42. opening and closing cover, 43. pivot shaft, 44. compressed air inlet, 45. latch, 46. mounting shaft, 47. connecting member, 5. air curtain device, 51. shell, 511. opening, 512. accommodating channel, 52. sensor, 53. compressed air inlet, 531. inlet channel, 54. fixing member, 55. connecting line, 56. sealing member, C. cleaning position, D. distance, G. spacing, I. impregnation machine, W. working position, L. light DETAILED DESCRIPTION

[0025] The following is an explanation of the implementation of the "air curtain device for protecting sensors and the impregnation machine using the same" disclosed in the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed in various ways based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted according to actual dimensions. The following embodiments will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention.

[0026] It should be understood that the term "or" used in this document may include any one or more combinations of the associated listed items depending on the actual situation.

[0027] like Figures 1A to 1C , Figure 2A As shown, Figure 1A FIG. 4 is an exemplary top view of an impregnation machine according to an embodiment of the present invention. Figure 1B FIG. 4 is an exemplary front view of an impregnation machine according to an embodiment of the present invention.

[0028] Figure 1C FIG. 4 is an exemplary side view of an impregnation machine according to an embodiment of the present invention. Figure 2A FIG. 1 is an exemplary side view of an air curtain device in an impregnation machine according to an embodiment of the present invention in a working position. The impregnation machine 1 according to an embodiment of the present invention comprises a first roller 1, a second roller 2, a main bracket 3, a mounting frame 4 and an air curtain device 5.

[0029] like Figure 1A As shown, when connecting the first roller 1 and the second roller 2 (see Figure 2A ) is connected to the main support 3 through the first cylinder 31 and the second cylinder 32 on the horizontal support 33 of the main support 3. At least one air curtain device 5 is arranged in the mounting frame 4. Specifically, according to the embodiment of the present invention, the impregnation machine 1 may include 8 air curtain devices 5, but the present invention is not limited thereto. The number of air curtain devices 5 according to the present invention can be changed according to the needs of the user, the width of the cloth, the width of the mounting frame, the configuration of the impregnation machine, and the cost consideration.

[0030] like Figure 1BAs shown, in an embodiment according to the present invention, the spacing G between the eight air curtain devices 5 can be between 100 mm and 150 mm, preferably 130 mm, so that the air curtain device 5 can detect the entire range of the cloth (to be described in detail later) transported between the first roller 1 and the second roller 2. Specifically, the position of the air curtain device 5 closest to the two sides of the mounting frame 4 will not be arranged at the edge corresponding to the cloth, because the point where the cloth may break is usually in the middle, and the edge of the cloth is not easy to break due to the strong edge treatment. In addition, the detection light such as infrared light projected by the sensor in the air curtain device 5 can be a specific range, and the ranges projected by the sensors of the two adjacent air curtain devices 5 will overlap, and the range within the two outermost sensors on the two sides of the mounting frame is all a detectable range.

[0031] like Figure 2A As shown, according to an embodiment of the present invention, the impregnation machine 1 may include a first roller 1 and a second roller 2, with a gap between the two for the cloth to pass through after being soaked in glue but before the glue is solidified, so that the gap can be fine-tuned by adjusting the distance between the first roller 1 and the second roller 2 relative to each other, so that the amount of glue on the cloth can be controlled. The excess glue scraped or squeezed out by the gap will flow into the glue basin (not shown in the figure) located below the first roller 1 and the second roller 2.

[0032] like Figure 1B and Figure 1C As shown, according to an embodiment of the present invention, the first roller 1 and the second roller 2 can be connected to the main support 3 in a rolling manner, more specifically, connected to the vertical supports 34 on both sides of the main support 3, so that the first roller 1 and the second roller 2 can be fixed to the main support 3 and fixed relative to the main support 3 and roll and rotate along their own rotation axis. Figure 2A As shown, in the embodiment of the present invention, the first roller 1 and the second roller 2 rotate in the clockwise and counterclockwise directions on the paper surface respectively to convey the cloth F passing through the gap between the two to move upward, so that the cloth F, after being stained with glue and adjusting the thickness of the glue through the gap, can then move upward into an oven (not shown in the figure) for subsequent curing process steps.

[0033] like Figure 1CAs shown, the mounting frame 4 according to the embodiment of the present invention is provided with an air curtain device 5. When the air curtain device 5 is in the working position W, the air curtain device 5 can detect whether the cloth F is broken by means of a sensor provided therein. In order to detect whether the cloth F is broken immediately, the working position W of the air curtain device 5 can be closer to the first roller 1 than the standby or cleaning position (described in detail later). In this way, when the cloth F is detected to be broken, the impregnation machine I can be stopped by issuing a prompt such as a warning sound, a warning light, a warning signal, etc., that is, the first roller 1 and the second roller 2 stop rotating to stop conveying the cloth F. According to the embodiment of the present invention, the distance D between the first roller 1 and the mounting frame 4 in the working position W and carrying the air curtain device 5 can be in the range of 80 mm to 100 mm, preferably 90.5 mm, but the present invention is not limited thereto. As described above, the distance D is sufficient as long as the air curtain device 5 has enough time to provide a prompt to stop the first roller 1 and the second roller 2 from conveying the cloth F when the cloth F is detected to be broken, so as to prevent the broken cloth F from entering the oven of the next process step. A maximum of 1 second is allowed from the time when the air curtain device detects that the cloth F is broken to the time when the impregnation machine I stops operating. Generally speaking, the oven located above the first roller 1 and the second roller 2 is about 1 meter away from the first roller 1 and the second roller 2, but the present invention is not limited thereto.

[0034] like Figure 1B As shown, in the embodiment of the present invention, the main support 3 includes a horizontal support 33 and a vertical support 34. The two vertical supports 34 support the horizontal support 33 so that the main support 3 is Figure 1B In the front view of the figure, a U-shaped bracket is formed. By setting two cylinders above the horizontal bracket 33, namely the first cylinder 31 and the second cylinder 32, the two ends of the mounting frame 4 are connected downward, so that the mounting frame 4 can be suspended below the horizontal bracket 33 and between the two vertical brackets 34. However, the present invention is not limited to setting two cylinders. In another embodiment of the present invention, more than two cylinders can be configured, as long as the connected mounting frame 4 can be stably suspended under the horizontal bracket 33 and can move up and down. This configuration allows the cylinder installed above the horizontal bracket 33 to not only provide the function of the mounting frame 4 suspended below the horizontal bracket 33 to move up and down, but also avoid blocking or hindering the movement of the mounting frame 4 itself, but the present invention is not limited to this. In another embodiment of the present invention, the mounting frame 4 can also be directly fixedly connected to the bottom of the horizontal bracket 33 of the main bracket 3 or directly connected to the middle or inner side of the two vertical brackets 34, as long as the air curtain device 5 can be set close to the cloth F moving between the gap between the first roller 1 and the second roller 2 to detect the rupture.

[0035] Figure 2B FIG. 4 is an exemplary side view of the air curtain device 5 in the impregnation machine 1 according to an embodiment of the present invention in the cleaning position C. Figure 2A and Figure 2B As shown, according to the embodiment of the present invention, the impregnation machine 1 having the first cylinder 31 and the second cylinder 32 can be placed in the working position W ( Figure 2A ) and cleaning position C( Figure 2B ) so that when in the working position W, the air curtain device 5 can be close enough to the first roller 1 to more quickly detect whether the cloth F is broken after the cloth F passes through the first roller 1 and the second roller 2, and can send a prompt within an allowable reaction time (within about 1 second) and let the impregnation machine I stop conveying the cloth F.

[0036] like Figure 2B As shown, according to an embodiment of the present invention, when in the cleaning position C, the air curtain device 5 can move away from the first roller 1 until it abuts against the bottom of the horizontal bracket 33 under the action of the first cylinder 31 and the second cylinder 32 driving the mounting frame 4 to rise. At this time, the air curtain device 5 does not detect whether the cloth F is broken, but leaves enough space between itself and the first roller 1 so that the user can clean the air curtain device 5. It should be understood that the entire working environment of the impregnation machine I is full of organic solvents. In order to avoid the adhesion of organic solvents affecting the basic operation of the machine or reducing the accuracy of sensor detection or the working life of internal devices, it is necessary to stop the machine regularly for cleaning. Letting the air curtain device 5 rise to the cleaning position C will help the cleaning operation. In an embodiment of the present invention, the cleaning position C and the working position W are in an upper and lower position relationship compared to the main bracket 3 (horizontal bracket 33, vertical bracket 34). However, the present invention is not limited thereto. The cleaning position C and the working position W can be changed in their positional relationship by changing the installation angles of the first cylinder 31 and the second cylinder 32 relative to the main bracket 3, as long as the air curtain device 5 at the working position W can accurately detect whether the cloth F is torn and the mounting frame 4 and the air curtain device 5 at the cleaning position C have enough space away from the first roller 1 to perform cleaning operations.

[0037] Figure 3 FIG. 5 is an exemplary side view of an air curtain device 5 according to an embodiment of the present invention. The air curtain device 5 according to an embodiment of the present invention is used to protect a sensor 52 disposed therein, and the air curtain device 5 includes a housing 51, a compressed air inlet 53, a fixing member 54, a connecting line 55, and a sealing member 56.

[0038] According to an embodiment of the present invention, the housing 51 may have a receiving passage 512 formed in the middle and penetrating the main body of the housing 51. An opening 511 is formed at one end of the receiving passage 512, so that the sensor 52 can radiate light to the outside of the housing 51 through the opening 511 and the compressed air A entering the receiving passage 512 can flow out of the housing 51 through the opening 511, so as to form an air curtain between the sensor 52 and the opening 511, thereby protecting the sensor 52 from being contaminated or adhered by the organic solvent in the working environment of the impregnation machine I. The opening 511 is arranged so that the direction in which the compressed air A flows in the receiving passage 512 is the same as the direction in which the sensor 52 radiates light L to the outside of the housing 51.

[0039] According to an embodiment of the present invention, the air curtain device 5 includes a compressed air inlet 53 formed in the housing 51 and an inlet channel 531 introduced by the compressed air inlet 53. The compressed air inlet 53 can be connected to a compressed air bottle (not shown) arranged outside the impregnation machine 1 by a gas pipeline (not shown), and a speed regulating valve (not shown) can be further arranged on the gas pipeline to adjust the flow rate of the compressed air, for example, the compressed air is adjusted to a flow rate of 0.3 m per second (0.3 m / s). According to an embodiment of the present invention, the inlet channel 531 formed between the compressed air inlet 53 and the accommodating channel 512 can provide a channel for compressed air to pass through the housing 51 and enter the accommodating channel 512 because the accommodating channel 512 and the inlet channel 531 are fluidically connected. In an embodiment of the present invention, the directions in which the inlet channel 531 and the accommodating channel 512 extend are perpendicular to each other as shown in the figure, but the present invention is not limited thereto, and the directions in which the two extend can be inclined or parallel to each other, as long as the compressed air can enter the accommodating channel 512 along the inlet channel 531 through the compressed air inlet 53.

[0040] According to an embodiment of the present invention, the sensor 52 may be disposed in the accommodating channel 512 of the shell 51, and radiate light L toward the opening 511 of the shell 51 toward the outside of the shell 51 on the continuously transported cloth F, so as to detect whether the cloth F has cracks. The sensor 52 may be, for example, an infrared sensor, and the light L it radiates is infrared light, and it determines whether the surface of the cloth F has cracks by receiving the infrared light reflected from the surface of the cloth F and determining the attenuation of the infrared light. According to another embodiment of the present invention, the sensor 52 may be, for example, a laser sensor. Figure 3 As shown, in an embodiment of the present invention, the sensor 52 may be, for example, in the shape of a long strip, so as to be placed in a receiving channel 512 having a similar contour, and the surrounding space provides compressed air A to flow in the receiving channel 12 .

[0041] In the embodiment of the present invention, Figure 3As shown, the air curtain device 5 may include a fixing member 54, such as a fixing screw, which is used to pass through the shell 51 and abut against the sensor 52, and fix the sensor 52 in the accommodating channel 512 without contacting the inner surface of the accommodating channel 512. In this way, space can be left for the compressed air A flowing in the accommodating channel 512 to flow smoothly and flow out of the shell 51 through the opening 511. In an embodiment of the present invention, the fixing member 54 may be, for example, two or more fixing screws, which are symmetrically arranged to be locked in the threaded holes penetrated in the shell 51 and fixedly connected to the shell 51 to clamp the sensor 52. However, the present invention is not limited to this. In another embodiment of the present invention, the fixing member 54 may also be, for example, a clamping member, a buckle, an annular kit, etc., as long as the sensor 52 can be stably fixed in the accommodating channel 512.

[0042] In the embodiment of the present invention, Figure 3 As shown, the rear end (right side of the figure) of the sensor 52 is connected with a connecting line 55 which may be, for example, an optical fiber line. As mentioned above, the working environment of the impregnation machine 1 is full of organic solvents with explosion risks, so electronic parts or electronic parts must be protected with explosion-proof levels as much as possible in the working environment. To this end, according to an embodiment of the present invention, a connecting line 55 is provided to electrically connect the sensor 52 to an external device (not shown) of electronic parts such as a controller, a control box, and a power supply outside the impregnation machine 1 to ensure the safety of the working environment of the impregnation machine 1. According to an embodiment of the present invention, the connecting line 55 extends through the rear end opening of the housing 51 (right side of the figure) and is provided with a sealing member 56 which may be, for example, a silicone gasket, to completely seal the rear end opening to ensure that the compressed air A entering the housing 51 through the compressed air inlet 53 will not leak from the rear end opening. The sealing member 56 according to the present invention may be a solvent-resistant soft material such as silicone or Teflon.

[0043] Figure 4 The mounting frame 4 according to the embodiment of the present invention may include a cover 41 , an opening and closing cover 42 , a pivot shaft 43 , a latch 45 , a mounting shaft 46 and a connecting member 47 .

[0044] In the embodiment of the present invention, the shield 41 of the mounting frame 4 is fixedly connected to the first cylinder 31 and the second cylinder 32, and the opening and closing cover 42 of the mounting frame 4 can be pivoted between the open position and the closed position relative to the shield 41 or the main support 3 to which the shield 41 is fixedly connected around the pivot axis 43. When the opening and closing cover 42 is in the closed position, the free end of the opening and closing cover 42 can be fixedly connected to the shield 41 by the latch 45, so that the mounting frame 4 forms a closed space, so that the air curtain device 5 can be protected and supported by the mounting frame 4 during operation. When the opening and closing cover 42 is pivoted to the open position relative to the shield 41 or the main support 3 to which the shield 41 is fixedly connected around the pivot axis 43, the internal space of the mounting frame 4 is opened to the outside, so that the user can easily approach and contact the air curtain device 5 for cleaning. In combination with the above-mentioned raising of the entire mounting frame 4 to the cleaning position C, the impregnation machine 1 according to the present invention can significantly facilitate cleaning work.

[0045] According to an embodiment of the present invention, Figure 4 As shown, the air curtain device 5 can be fixedly connected to the housing 51 with a connecting member 47, and the connecting member 47 is connected to the mounting shaft 46, so that the air curtain device 5 can be firmly fixed at a specific position of the mounting frame 4 relative to the mask 41. In this way, the opening 511 of the housing 51 of the air curtain device 5 can be relatively positioned on the opening of the mounting frame 4, so that the light L emitted by the sensor 52 can be irradiated on the surface of the cloth F outside the mounting frame 4 without obstruction.

[0046] In another embodiment of the present invention, unlike the above-mentioned sealing member 56 provided at the rear end opening of the shell 51 where the connecting line 55 passes through, a compressed air inlet 44 is formed in the shield 41 of the mounting frame 4 of this embodiment. In this way, the shell 51 does not need to form a compressed air inlet 53, but opens the rear end opening 57 to the outside. The compressed air can directly flow in the internal space of the opening and closing cover 42 of the mounting frame 4 when it is in the closed position, and flow through the accommodating channel 512 of the shell 51 through the rear end opening 57, and finally flow out from the opening 511 and the corresponding opening of the mounting frame 4, and also form an air curtain between the sensor 52 and the opening 511, protecting the sensor 52 from contamination or adhesion of working gas or liquid such as organic solvent in the operating environment of the impregnation machine 1 outside the mounting frame 4. According to another embodiment of the present invention, the compressed air inlet 44 is formed on the shield 41 of the mounting frame 4. However, the present invention is not limited to this, and the compressed air inlet 44 can also be formed on the opening and closing cover 42 or in the gap or hole between the opening and closing cover 42 and the shield 41 when the opening and closing cover 42 is closed.

[0047] In yet another embodiment of the present invention, in order to cooperate with the mounting frame 4 at the cleaning position C to abut against the lower side of the upper horizontal bracket 33, so that the cleaning agent for cleaning the oven located above the impregnation machine 1 will not spray downward to damage the air curtain device 5 in the mounting frame 4, a shielding cover 6 can be further provided, such as Figure 1B According to this embodiment, the shielding cover 6 may be L-shaped, with one side connected to the horizontal support 33 and the other side extending downward to shield the cleaning solvent from being sprayed onto the mounting frame 4 .

[0048] The contents disclosed above are only feasible embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention's specification and drawings are included in the claims of the present invention.

Claims

1. An air curtain device for protecting a sensor, characterized in that: include: a housing including an opening facing outward; A sensor, which is disposed in the housing and is used to radiate light outside the housing through the opening; as well as a compressed air inlet formed in the housing for introducing compressed air from outside the housing into the housing; The compressed air leaves the housing through the opening in the same direction as the light emitted by the sensor, so that an air curtain for protecting the sensor is formed between the sensor and the opening.

2. The air curtain device according to claim 1, characterized in that: An accommodating channel is formed in the shell for accommodating the sensor.

3. The air curtain device according to claim 2, characterized in that: An inlet channel is formed in the housing and is in fluid communication with the accommodating channel; and The compressed air passes through the compressed air inlet and enters the accommodating channel along the inlet channel.

4. The air curtain device according to claim 3, characterized in that: The accommodating channel and the inlet channel extend in directions perpendicular to each other.

5. The air curtain device according to claim 1, characterized in that: The invention further comprises at least one fixing member, which is used for passing through the shell and abutting against the sensor to fix the sensor in the shell.

6. The air curtain device according to claim 1, characterized in that: The sensor includes a connecting line, and the connecting line electrically connects the sensor and an external device.

7. An impregnation machine for impregnating cloth with viscose, characterized in that: include: Two rollers, used to make the cloth pass through the gap between the two rollers after the cloth is soaked in glue, so as to control the amount of glue on the cloth; A main support, the two rollers are rollingly connected to the main support; A mounting frame connected to the main support, wherein the mounting frame is provided with at least one air curtain device as described in any one of claims 1 to 6, and when the mounting frame is in a working position, the air curtain device is used to detect whether the cloth is broken.

8. The impregnation machine according to claim 7, characterized in that The mounting frame is connected to the main support via at least one cylinder, and the at least one cylinder enables the mounting frame to move relative to the main support between the working position and the cleaning position.

9. The impregnation machine according to claim 7, characterized in that The mounting frame includes a shield and an opening and closing cover, and the opening and closing cover can be pivoted relative to the shield between an open position and a closed position.

10. The impregnation machine according to claim 7, characterized in that A plurality of air curtain devices are included, wherein the interval between two adjacent air curtain devices is between 100 mm and 150 mm.

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