A formaldehyde detection device for safety testing of synthetic fabrics

Abstract

The invention relates to a formaldehyde detection device for safety detection of synthetic fabrics in the field of detection equipment. When formaldehyde detection is performed on the synthetic fabric, sampling is achieved without affecting the continuous production of the synthetic fabric through a sampling device including a liquid spraying hood and a liquid suction shovel and a synchronization mechanism for driving the sampling device and the synthetic fabric to move synchronously; and through the cooperation of the liquid spraying hood and the liquid suction shovel, an extracting agent is sprayed onto a block-shaped strip fabric at a clamping position of the liquid spraying hood and the liquid suction shovel, and the extracting liquid is collected, thereby realizing non-destructive sampling of the synthetic fabric without cutting and destroying the strip fabric; in addition, negative pressure collection of the extracting liquid is realized through a central tube and a sleeve and a negative pressure suction pump connected to the sleeve, and the extracting liquid in the reagent tube is quickly detected through a spectrophotometer arranged outside the reagent tube, thereby improving the formaldehyde detection efficiency.

Description

Technical Field

[0001] The invention relates to a synthetic fabric detection device, in particular to a formaldehyde detection device used for synthetic fabric safety detection and applied in the field of fabric production detection equipment. Background Art

[0002] Formaldehyde is an organic chemical raw material widely used in the textile printing and dyeing industry, but it is also a forced mutagen and allergen. Formaldehyde residues may cause harm to human health through skin contact or respiratory tract, such as allergies, dermatitis, respiratory inflammation, etc., and may even cause cancer or teratogenesis. Therefore, in order to ensure the health of consumers, it is necessary to detect the formaldehyde content in synthetic fabrics. The detection methods mainly include spectrophotometry, electrochemical detection, gas chromatography, liquid chromatography, etc. Among them, spectrophotometry is widely used because of its simple operation and high sensitivity.

[0003] A significant limitation of the existing formaldehyde testing process for synthetic fabrics is the destructive nature of the testing process. Specifically, current equipment requires that synthetic fabrics be cut into small pieces, and then the cut fabric samples are placed in a test tube containing an extractant to extract and adsorb free formaldehyde. After this pretreatment step is completed, the test tube needs to be sent to a spectrophotometer for quantitative analysis to determine the formaldehyde content. However, this method is only applicable to finished rolls, as it inevitably destroys the fabric to be tested and cannot meet the non-destructive testing needs of continuous production lines.

[0004] For continuous synthetic fabric production lines that pursue efficient quality control and immediate feedback, current testing methods are inadequate. It is impossible to conduct immediate and non-destructive formaldehyde content testing of fabrics at each stage without interrupting the production process, making it difficult to timely locate and correct specific production process links that may cause formaldehyde to exceed the standard. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the existing synthetic fabric detection equipment requires destructive sampling and is unable to sample and detect synthetic fabrics on a continuous production line.

[0006] In order to solve the above problems, the present invention provides a formaldehyde detection device for safety detection of synthetic fabrics, comprising a material guide frame for horizontally conveying strip fabrics and a sampling device installed above the material guide frame, the sampling device comprising a liquid spraying hood and a liquid suction bar clamped on both sides of the synthetic fabric from top to bottom, the liquid spraying hood is connected to an extractant supply mechanism through a liquid inlet pipe, the liquid suction bar is connected to a liquid injection pipe through a liquid suction pipe, a reagent tube is plugged under the liquid injection pipe, and a loading tray is plugged into the reagent tube; the liquid injection pipe comprises a central tube inserted into the lower part of the inner cavity of the reagent tube and connected to the liquid suction pipe, and a sleeve sleeved on the outer side of the central tube and inserted into the upper part of the inner cavity of the reagent tube, a suction hole connected to the inner cavity of the reagent tube is opened at the lower part of the sleeve, a suction pipe is connected to the upper part of the sleeve, and the suction pipe is connected to a negative pressure suction pump; the sampling device is connected to a synchronization mechanism driving it to move synchronously with the strip fabric, the liquid injection pipe and the negative pressure suction pump are both fixedly connected to the lifting frame, and a lifting cylinder is fixedly connected to the end of the lifting frame; a spectrophotometer for detecting the extract in the reagent tube is provided below the loading tray.

[0007] In the above-mentioned formaldehyde detection device for safety detection of synthetic fabrics, non-destructive sampling of synthetic fabrics on a continuous production line is achieved through a synchronization mechanism and a sampling device.

[0008] As a further improvement of the present application, the extractant supply mechanism includes an injection pump connected to the liquid inlet pipe, the injection pump is connected to a liquid storage tank through a pipeline, the liquid storage tank is filled with the extractant, a heating wire and a temperature sensor are provided in the liquid storage tank, a flip plate is hinged at the opening at the upper end of the suction scraper, and a torsion spring is installed at the hinge position between the flip plate and the inner wall of the suction scraper.

[0009] As a further improvement of the present application, the spray hood and the suction scraper have the same structure and are mirror-symmetrical. The spray hood is a flat structure with a triangular upper cross-section and a rectangular lower cross-section. A rectangular opening is provided at the bottom of the spray hood, and a rectangular ring-shaped sealing ring is nested on the lower end surface of the spray hood outside the rectangular opening.

[0010] As a further improvement of the present application, the synchronization mechanism includes a pair of symmetrically arranged clamping arms respectively fixedly connected to the spray hood and the suction squeegee, the pair of clamping arms are connected to a bidirectional screw module, and the bidirectional screw module is connected to a transverse screw module arranged parallel to the strip fabric.

[0011] As a further improvement of the present application, the reagent tube includes a tube body and a tube cover threadedly connected to the opening of the upper end of the tube body, a rubber ring is nested in the tube cover, the rubber ring is provided with a conical hole for inserting the injection tube and which has an interference fit with the injection tube, and the lower parts of both the center tube and the sleeve are pointed.

[0012] As a further improvement of the present application, the extractant is one of water or ethanol, and the spectrophotometer includes a light source and a receiver arranged on two sides of the reagent tube.

[0013] As a further improvement of the present application, the loading tray is a disc-shaped structure, the number of reagent tubes is multiple and they are evenly distributed on the loading tray in a circle, and a rotating motor is connected under the loading tray to drive it to rotate.

[0014] As a further improvement of the present application, a uniform spray pipe is provided in the spray hood, the uniform spray pipe is in an inverted T-shaped structure and a horizontal portion thereof is provided with uniformly distributed spray holes.

[0015] In summary, when the formaldehyde detection is performed on the synthetic fabric, the present invention realizes sampling without affecting the continuous production of the synthetic fabric through the sampling device including the liquid spray hood and the liquid suction shovel and the synchronization mechanism that drives the sampling device and the synthetic fabric to move synchronously; and through the cooperation of the liquid spray hood and the liquid suction shovel, the extractant is sprayed onto the block-shaped strip fabric at the clamping position of the liquid spray hood and the liquid suction shovel and the extract is collected, thereby realizing non-destructive sampling of the synthetic fabric without cutting and destroying the strip fabric; in addition, through the central tube and the sleeve and the negative pressure suction pump connected to the sleeve, the negative pressure collection of the extract is realized, and the extract in the reagent tube is quickly detected by the spectrophotometer arranged on the outside of the reagent tube, thereby improving the formaldehyde detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the three-dimensional structure of this application;

[0017] Figure 2 This is a schematic diagram of the longitudinal cross-sectional structure of the present application;

[0018] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0019] Figure 4 for Figure 2 A schematic diagram of the enlarged structure at B in the middle;

[0020] Figure 5 It is a schematic diagram of the cross-sectional structure of the liquid injection tube in this application;

[0021] Figure 6 This is a schematic diagram of the connection between the liquid injection tube and the negative pressure air pump in this application;

[0022] Figure 7 This is a schematic diagram of the cross-sectional exploded structure of the reagent tube in this application;

[0023] Figure 8 It is a schematic diagram of the extract collection state;

[0024] Fig. 9 It is a schematic diagram of the exploded assembly of the liquid spray hood and the liquid suction squeegee in this application;

[0025] Fig.10 Schematic diagram of the three-dimensional structure of the spectrophotometer in this application;

[0026] Fig.11 This is a schematic diagram of the assembly of the transverse screw module and the bidirectional screw module in this application;

[0027] Fig.12 It is a schematic diagram of the assembly of the reagent tube and the loading tray in this application.

[0028] Description of the numbers in the figure:

[0029] 1. Material guide rack; 2. Strip fabric; 3. Sampling device; 4. Synchronous mechanism; 5. Loading tray; 6. Reagent tube; 601. Tube body; 602. Tube cover; 603. Rubber ring; 7. Spray cover; 8. Liquid inlet pipe; 9. Even spray pipe; 10. Suction bar; 11. Suction tube; 12. Flip plate; 13. Clamping arm; 14. Bidirectional screw module; 15. Horizontal screw module; 16. Liquid injection pump; 17. Liquid storage tank; 18. Liquid injection tube; 1801. Center tube; 1802. Sleeve; 1803. Suction hole; 19. Suction tube; 20. Negative pressure suction pump; 21. Lifting rack; 22. Lifting cylinder; 23. Spectrophotometer; 2301. Light source; 2302. Receiver; 24. Sealing ring; 25. Rotating motor. DETAILED DESCRIPTION

[0030] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0031] The first implementation method:

[0032] Figure 1-11 A formaldehyde detection device for safety detection of synthetic fabrics is shown, comprising a material guide frame 1 for horizontally conveying strip fabrics 2 and a sampling device 3 installed above the material guide frame 1, wherein the sampling device 3 comprises a liquid spraying cover 7 and a liquid suction shovel 10 clamped on both sides of the synthetic fabric in an upper and lower relative manner, the liquid spraying cover 7 is connected to an extractant supply mechanism through a liquid inlet pipe 8, the liquid suction shovel 10 is connected to a liquid injection pipe 18 through a liquid suction pipe 11, a reagent pipe 6 is inserted below the liquid injection pipe 18, and a loading tray 5 is inserted into the reagent pipe 6;

[0033] The injection tube 18 includes a central tube 1801 inserted into the lower part of the inner cavity of the reagent tube 6 and connected to the liquid suction tube 11, and a sleeve 1802 sleeved on the outer side of the central tube 1801 and inserted into the upper part of the inner cavity of the reagent tube 6. The lower part of the sleeve 1802 is provided with an air suction hole 1803 connected to the inner cavity of the reagent tube 6. The upper part of the sleeve 1802 is connected to a suction tube 19, and the suction tube 19 is connected to a negative pressure suction pump 20.

[0034] The sampling device 3 is connected to a synchronization mechanism 4 that drives it to move synchronously with the strip fabric 2. Both the injection tube 18 and the negative pressure suction pump 20 are fixedly connected to a lifting frame 21, and a lifting cylinder 22 is fixedly connected to the end of the lifting frame 21; a spectrophotometer 23 for detecting the extract in the reagent tube 6 is provided under the loading tray 5.

[0035] See also Figure 1 The synchronization mechanism 4 includes a pair of symmetrically arranged clamping arms 13 respectively fixedly connected to the liquid spraying cover 7 and the liquid suction squeegee 10, the pair of clamping arms 13 are connected to a bidirectional screw module 14, the bidirectional screw module 14 drives the liquid spraying cover 7 and the liquid suction squeegee 10 to clamp or release the synthetic fabric through the pair of clamping arms 13, the bidirectional screw module 14 is connected to a transverse screw module 15 arranged parallel to the strip fabric 2, and the transverse screw module 15 drives the sampling device 3 to move synchronously with the strip fabric 2 through the bidirectional screw module 14

[0036] For more information, please refer to Figure 2-4 and Figure 8 , including the following steps:

[0037] Step 1: Start the transverse screw module 15, which drives the sampling device 3 to move synchronously with the strip fabric 2 through the bidirectional screw module 14 and the clamping arm 13, that is, the liquid spraying cover 7 and the liquid suction squeegee 10 are relatively stationary with the strip fabric 2; then, start the bidirectional screw module 14, and a pair of clamping arms 13 drive the liquid spraying cover 7 and the liquid suction squeegee 10 to move toward each other, and the liquid spraying cover 7 and the liquid suction squeegee 10 clamp the strip fabric 2 between them;

[0038] Step 2, start the extractant supply mechanism, the extractant supply mechanism injects the extractant into the liquid spraying cover 7 through the liquid inlet pipe 8, the extractant entering the liquid spraying cover 7 infiltrates the block-shaped strip fabric 2 located in the liquid spraying cover 7 and the liquid suction scraper 10, and the extractant absorbs free formaldehyde to form an extract;

[0039] Step 3, start the negative pressure suction pump 20, the negative pressure suction pump 20 sucks the gas in the inner cavity of the reagent tube 6 through the sleeve 1802 and the suction hole 1803, so that the reagent tube 6 generates negative pressure, the reagent tube 6 sucks the gas and the extraction liquid in the suction bar 10 through the suction tube 11, the suction bar 10 sucks the extraction liquid in the block-shaped strip fabric 2, and the extraction liquid is injected into the lower part of the inner cavity of the reagent tube 6 through the central tube 1801;

[0040] Step 4. After the extraction liquid is sucked, the bidirectional screw module 14 is started to make the liquid spray cover 7 and the liquid suction scraper 10 break away from the contact with the strip fabric 2. Then, the transverse screw module 15 is started to make the sampling device 3 return to the initial position. At the same time, the spectrophotometer 23 is started to perform optical detection on the extraction liquid in the reagent tube 6, and then the formaldehyde content at the detection position is determined.

[0041] Compared with the traditional formaldehyde detection equipment for synthetic fabrics, when the present invention detects formaldehyde on synthetic fabrics, the sampling device 3 including the liquid spray hood 7 and the liquid suction squeegee 10 moves synchronously with the synthetic fabrics on the production line, so that sampling can be achieved without affecting the continuous production of the synthetic fabrics; and through the cooperation of the liquid spray hood 7 and the liquid suction squeegee 10, the extractant is sprayed onto the block-shaped strip fabric 2 at the clamping position connected to the liquid spray hood 7 and the liquid suction squeegee 10 and the extract is collected, so as to achieve non-destructive sampling of the synthetic fabric without cutting and destroying the strip fabric 2; in addition, by including the central tube 1801 and the sleeve 1802 and the negative pressure suction pump 20 connected to the sleeve 1802, negative pressure collection of the extract is achieved, thereby improving the collection effect of the extract; in addition, the extract in the reagent tube 6 is quickly detected by the spectrophotometer 23 arranged on the outside of the reagent tube 6, thereby improving the formaldehyde detection efficiency.

[0042] See also Figure 3 and Fig. 9 The liquid spray hood 7 and the liquid suction scraper 10 have the same structure and are mirror-symmetrical. The liquid spray hood 7 is a flat structure with a triangular upper cross-section and a rectangular lower cross-section. A rectangular opening is provided at the lower portion of the liquid spray hood 7. A rectangular ring-shaped sealing ring 24 is nested on the lower end surface of the liquid spray hood 7 outside the rectangular opening.

[0043] Specifically, when the liquid spray hood 7 and the liquid suction squeegee 10 clamp the strip fabric 2, the contact positions between the two and the strip fabric 2 have good sealing properties, reducing the lateral diffusion of the extractant, facilitating the liquid suction squeegee 10 to fully absorb and collect the extract, reducing the residual extract that has adsorbed free formaldehyde, and achieving non-destructive sampling of the strip fabric 2.

[0044] See also Figure 1 and Fig.11 The extractant supply mechanism includes an injection pump 16 connected to the liquid inlet pipe 8. The injection pump 16 is connected to a liquid storage tank 17 through a pipeline. The liquid storage tank 17 is filled with the extractant. The injection pump 16 and the liquid storage tank 17 are both installed on the bottom plate of the material guide frame 1.

[0045] It should be noted that the extractant is one of water or ethanol.

[0046] Specifically, the extraction agent is added.

[0047] See also Fig.10 The spectrophotometer 23 includes a light source 2301 and a receiver 2302 which are arranged on both sides of the reagent tube 6 relative to each other.

[0048] Specifically, the formaldehyde content can be detected quickly.

[0049] See also Figure 7The reagent tube 6 includes a tube body 601 and a tube cover 602 threadedly connected to the upper end opening of the tube body 601. A rubber ring 603 is nested in the tube cover 602. The rubber ring 603 has a tapered hole for the injection tube 18 to be inserted and has an interference fit with the injection tube 18. The lower parts of both the central tube 1801 and the sleeve 1802 are pointed.

[0050] Specifically, the connection between the reagent tube 6 and the injection tube 18 has better sealing performance, which facilitates the collection of the extraction liquid under negative pressure.

[0051] Second implementation method:

[0052] Figure 1 , Figure 3 , Fig. 9 and Fig.12 A formaldehyde detection device for safety detection of synthetic fabrics is shown. Based on the first embodiment, a heating wire and a temperature sensor are provided in the liquid storage tank 17, a flip plate 12 is hinged at the opening of the upper end of the suction squeegee 10, and a torsion spring is installed at the hinge position between the flip plate 12 and the inner wall of the suction squeegee 10.

[0053] Specifically, by starting the heating wire and the temperature sensor, the temperature of the extractant rises, making the temperature of the extractant close to the body temperature of the human body in different states, thereby simulating the impact of different body temperatures of the human body on the release of free formaldehyde in the strip fabric 2.

[0054] More specifically, the release of free formaldehyde on clothing made of strip fabric 2 when the human body is in a static state or in a low-temperature air-conditioned environment is different from the release of free formaldehyde on clothing made of strip fabric 2 when the human body temperature rises after strenuous exercise and is accompanied by a large amount of sweat. Therefore, different temperature extractants are used to infiltrate and adsorb free formaldehyde to simulate the formaldehyde release of the fabric in different usage scenarios.

[0055] In addition, by providing a flip plate 12, the extraction liquid that passes through the strip fabric 2 and enters the side of the suction squeegee 10 is blocked, thereby increasing the contact and infiltration time between the extractant and the strip fabric 2. When the negative pressure suction pump 20 is started, the flip plate 12 rotates toward the side of the suction squeegee 10 under the action of negative pressure, and then the extraction of the extraction liquid is realized. By controlling the start timing of the negative pressure suction pump 20, the length of time that the extraction liquid infiltrates the synthetic fabric is controlled, thereby improving the sampling effect.

[0056] See also Fig.12 The loading tray 5 is a disc-shaped structure. There are multiple reagent tubes 6 that are equidistantly distributed on the loading tray 5 in a circle. A rotating motor 25 is connected below the loading tray 5 to drive the loading tray 5 to rotate.

[0057] Specifically, by cooperating with the rotating motor 25 and the lifting cylinder 22, the injection tube 18 and the plurality of reagent tubes 6 distributed in a circle are contacted and injected one by one, so as to realize multi-point, multi-time and multi-temperature sampling.

[0058] See also Figure 3 A uniform spray pipe 9 fixedly connected to the liquid inlet pipe 8 is arranged in the liquid spray cover 7. The uniform spray pipe 9 is in an inverted T-shaped structure and a horizontal portion thereof is provided with uniformly distributed spray holes.

[0059] Specifically, the uniform spray pipe 9 with uniformly distributed spray holes allows the extractant to quickly and uniformly contact the strip-shaped fabric 2, thereby improving the effect of wetting and adsorbing free formaldehyde.

[0060] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A formaldehyde detection device for safety testing of synthetic fabrics, It is characterized in that The invention comprises a material guide frame (1) for horizontally conveying a strip-shaped fabric (2) and a sampling device (3) installed above the material guide frame (1), wherein the sampling device (3) comprises a liquid spraying cover (7) and a liquid suction shovel (10) clamped on both sides of the synthetic fabric in an upper and lower manner, wherein the liquid spraying cover (7) is connected to an extractant supply mechanism via a liquid inlet pipe (8), and the liquid suction shovel (10) is connected to a liquid injection pipe (18) via a liquid suction pipe (11), a reagent pipe (6) is inserted below the liquid injection pipe (18), and a loading tray (5) is inserted into the reagent pipe (6); The injection tube (18) comprises a central tube (1801) inserted into the lower part of the inner cavity of the reagent tube (6) and connected to the liquid suction tube (11), and a sleeve (1802) sleeved on the outside of the central tube (1801) and inserted into the upper part of the inner cavity of the reagent tube (6), the lower part of the sleeve (1802) is provided with an air suction hole (1803) connected to the inner cavity of the reagent tube (6), the upper part of the sleeve (1802) is connected to a suction tube (19), and the suction tube (19) is connected to a negative pressure suction pump (20); The sampling device (3) is connected to a synchronization mechanism (4) for driving it to move synchronously with the strip fabric (2); the injection tube (18) and the negative pressure suction pump (20) are both fixedly connected to a lifting frame (21); a lifting cylinder (22) is fixedly connected to the end of the lifting frame (21); and a spectrophotometer (23) for detecting the extract in the reagent tube (6) is provided below the loading tray (5).

2. A formaldehyde detection device for safety detection of synthetic fabrics according to claim 1, It is characterized in that The extractant supply mechanism comprises an injection pump (16) connected to the liquid inlet pipe (8), the injection pump (16) being connected to a liquid storage tank (17) through a pipeline, the liquid storage tank (17) being filled with the extractant, a heating wire and a temperature sensor being arranged in the liquid storage tank (17), a flip plate (12) being hingedly connected at the upper opening of the liquid suction scraper (10), and a torsion spring being installed at a hinged position between the flip plate (12) and the inner wall of the liquid suction scraper (10).

3. A formaldehyde detection device for safety detection of synthetic fabrics according to claim 1, It is characterized in that The liquid spray hood (7) and the liquid suction scraper (10) have the same structure and are mirror-symmetrical. The liquid spray hood (7) is a flat structure with a triangular upper cross-section and a rectangular lower cross-section. A rectangular opening is provided at the lower portion of the liquid spray hood (7). A rectangular ring-shaped sealing ring (24) is embedded on the lower end surface of the liquid spray hood (7) outside the rectangular opening.

4. A formaldehyde detection device for safety detection of synthetic fabrics according to claim 1, It is characterized in that The synchronization mechanism (4) comprises a pair of symmetrically arranged clamping arms (13) respectively fixedly connected to the liquid spraying hood (7) and the liquid suction squeegee (10); the pair of clamping arms (13) are connected to a bidirectional screw module (14); and the bidirectional screw module (14) is connected to a transverse screw module (15) arranged parallel to the strip fabric (2).

5. A formaldehyde detection device for safety detection of synthetic fabrics according to claim 1, It is characterized in that The reagent tube (6) comprises a tube body (601) and a tube cover (602) threadedly connected to the upper opening of the tube body (601), a rubber ring (603) is nested in the tube cover (602), and the rubber ring (603) is provided with a tapered hole for inserting the injection tube (18) and having an interference fit with the injection tube (18), and the lower parts of both the central tube (1801) and the sleeve (1802) are pointed.

6. A formaldehyde detection device for safety detection of synthetic fabrics according to claim 2, It is characterized in that The extractant is one of water and ethanol. The spectrophotometer (23) comprises a light source (2301) and a receiver (2302) which are arranged on two sides of the reagent tube (6) relative to each other.

7. A formaldehyde detection device for safety detection of synthetic fabrics according to claim 2, It is characterized in that The loading disk (5) is a disk-shaped structure. The number of reagent tubes (6) is plural and they are equidistantly distributed on the loading disk (5) in a circumferential manner. A rotating motor (25) is connected below the loading disk (5) to drive the loading disk (5) to rotate.

8. A formaldehyde detection device for safety detection of synthetic fabrics according to claim 2, It is characterized in that The liquid spraying cover (7) is provided with a uniform spraying pipe (9), which is in an inverted T-shaped structure and has uniformly distributed spray holes in its horizontal portion.

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