Cut tobacco dryer air tightness detection device and detection method

Abstract

The invention discloses a cut-tobacco dryer air tightness detection device and detection method. The cut-tobacco dryer air tightness detection device comprises a steam input pipeline, a cut-tobacco dryer roller, a condensate water discharge pipeline, a bypass branch and a switch assembly. The bypass branch comprises a compressed air injection branch, a liquid injection branch and a detection condensate water discharge branch, compressed air provided by the compressed air injection branch is transmitted to the cut tobacco dryer roller, and liquid provided by the liquid injection branch is transmitted to the cut tobacco dryer roller; detection condensate water generated by the cut tobacco dryer roller is discharged through the detection condensate water discharge branch; the first valve is used for controlling flowing and stopping of steam; the second valve is used for controlling flowing and stopping of condensate water; the third valve is located on the compressed air injection branch, the fourth valve is located on the liquid injection branch, the fifth valve is located on the detection condensate water discharge branch, and the air tightness detection of the cut-tobacco dryer roller can be better realized by adding the bypass branch and adjusting the conduction state.

Description

Technical Field

[0001] The present invention relates to the field of tobacco equipment control, and in particular to an air tightness detection device and a detection method for a tobacco drying machine. Background Art

[0002] During use, the heat exchange plates, flanges, and welds within the drum dryer are prone to leaks. The two existing inspection methods have drawbacks, as follows: The first involves shutting down the dryer until it has completely cooled, then having personnel enter the drum to inspect the heat exchange plates, pipe joints, and welds. The sealing of the plates is determined by the presence of condensed water dripping from the production process. This method has certain blind spots and subjectivity, and cannot accurately reflect the actual problem. Another inspection method involves disassembling the steam and steam recovery pipes, filling them with water, sealing them, and then performing a water pump pressure test. Personnel then enter the drum to investigate. This method can increase the visibility of leaks, but the entire process is too cumbersome to meet the needs of routine testing. Summary of the Invention

[0003] The present invention provides a device and method for detecting air tightness of a tofu drying machine, which can better detect the air tightness of a tofu drying machine drum by adding a bypass branch and adjusting its conduction state.

[0004] In a first aspect, an embodiment of the present invention provides an air tightness detection device for a tofu drying machine, comprising a steam input pipe, a tofu drying machine drum, a condensate discharge pipe, a bypass branch, and a switch assembly;

[0005] The steam input pipe and the condensed water discharge pipe are respectively connected to the wire drying drum, the steam provided by the steam input pipe is transmitted to the wire drying drum, and the condensed water generated by the wire drying drum is discharged through the condensed water discharge pipe;

[0006] The bypass branch includes a compressed air injection branch, a liquid injection branch, and a detection condensed water discharge branch. The compressed air injection branch includes a first interface, the liquid injection branch includes a second interface, and the detection condensed water discharge branch includes a third interface. The first interface and the second interface are connected to the steam input pipe, and the second interface is located near the first interface and the wire drying drum. The compressed air provided by the compressed air injection branch is transmitted to the wire drying drum, and the liquid provided by the liquid injection branch is transmitted to the wire drying drum; the third interface is connected to the condensed water discharge pipeline, and the detection condensed water generated by the wire drying drum is discharged through the detection condensed water discharge branch.

[0007] The switch assembly includes a first valve, a second valve, a third valve, a fourth valve and a fifth valve; the first valve is located in the steam input pipeline, and the first valve is used to control the flow and cutoff of the steam; the second valve is located in the condensate discharge pipeline, and the second valve is used to control the flow and cutoff of the condensate; the third valve is located in the compressed air injection branch, the fourth valve is located in the liquid injection branch, and the fifth valve is located in the detected condensate discharge branch.

[0008] Optionally, the third valve includes a first solenoid valve, the fourth valve includes a second solenoid valve, and the fifth valve includes a needle valve.

[0009] Optionally, the first valve includes a first stop valve, and the second valve includes a second stop valve.

[0010] Optionally, the air tightness detection device for the tofu drying machine further includes a pressure gauge, which is located on the steam input pipe and between the second interface and the first interface.

[0011] Optionally, the air tightness detection device of the tow dryer further includes a liquid detection device, which is located on the condensed water discharge branch, and is located on a side of the third interface away from the condensed water discharge pipeline.

[0012] Optionally, the air tightness detection device of the tofu drying machine further includes a water injection amount detection device, and the water injection amount detection device is connected to the tofu drying machine drum.

[0013] Optionally, the air tightness detection device of the tofu drying machine also includes a leakage point detection device, which includes a first leakage point detection unit and a second leakage point detection unit; the first leakage point detection unit is located in the steam input pipe, and the second leakage point detection unit is located in the condensate discharge pipe.

[0014] In a second aspect, an embodiment of the present invention provides a method for detecting air tightness of a wire drying drum, using the wire drying drum air tightness detection device according to any one of the first aspects, the method comprising:

[0015] controlling the first valve to close and controlling the second valve to close;

[0016] Controlling the third valve to open and controlling the fifth valve to open, so that the liquid provided by the liquid injection branch is transmitted to the tow drying machine drum;

[0017] When the detection condensed water flows out of the detection condensed water discharge branch, the third valve is controlled to be closed and the fifth valve is controlled to be closed, and the fourth valve is controlled to be opened; the compressed air provided by the compressed air injection branch is transmitted to the tow drying machine drum;

[0018] Determine whether there are leaks in the steam input pipeline and the condensate discharge pipeline.

[0019] Optionally, the air tightness detection device for the tofu drying machine further includes a pressure gauge, which is located on the steam input pipe and between the second interface and the first interface;

[0020] Determining whether there are leaks in the steam input pipeline and the condensate discharge pipeline includes:

[0021] Obtain the value a of the barometer, and the compressed air provided by the compressed air injection branch is b;

[0022] Determine whether (ba) / b≤0.3 is satisfied within the first preset time;

[0023] If the conditions are met, it proves that there are no leaks in the steam input pipeline and the condensate discharge pipeline;

[0024] If it is not satisfied, it proves that there are leaks in the steam input pipeline and the condensate discharge pipeline.

[0025] Optionally, the air tightness detection device for the tofu drying machine further includes a leakage detection device, which includes a first leakage detection unit and a second leakage detection unit; the first leakage detection unit is located in the steam input pipe, and the second leakage detection unit is located in the condensate discharge pipe;

[0026] Determining whether there are leaks in the steam input pipeline and the condensate discharge pipeline includes:

[0027] Obtaining a first leakage point detection result of the first leakage point detection unit;

[0028] Obtaining a second leakage point detection result of the second leakage point detection unit;

[0029] It is determined whether there are leaks in the steam input pipeline and the condensate discharge pipeline according to the first leak point detection result and the second leak point detection result.

[0030] An embodiment of the present invention provides an air tightness detection device for a wire drying machine, which includes a steam input pipe, a wire drying machine drum and a condensed water discharge pipe, wherein the steam provided by the steam input pipe is transmitted to the wire drying machine drum, and the condensed water generated by the wire drying machine drum is discharged through the condensed water discharge pipe; the air tightness detection of the wire drying machine is achieved by detecting the air tightness of the steam input pipe and the condensed water discharge pipe; specifically, the air tightness detection device for the wire drying machine also includes a bypass branch and a switch assembly, wherein the bypass branch includes a compressed air injection branch, a liquid injection branch and a condensed water discharge branch, and the compressed air injection branch provides The compressed air is transmitted to the wire drying machine drum, and the liquid provided by the liquid injection branch is transmitted to the wire drying machine drum; the detection condensed water generated by the wire drying machine drum is discharged through the detection condensed water discharge branch; the switch component includes a first valve, a second valve, a third valve, a fourth valve and a fifth valve; the first valve is used to control the flow and cutoff of steam; the second valve is used to control the flow and cutoff of condensed water; the third valve is located in the compressed air injection branch, the fourth valve is located in the liquid injection branch, and the fifth valve is located in the detection condensed water discharge branch. By adding a bypass branch and adjusting its conduction state, the air tightness detection of the wire drying machine drum can be better achieved.

[0031] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 1 is a schematic structural diagram of a first air tightness detection device for a tofu drying machine provided by an embodiment of the present invention;

[0034] Figure 2 1 is a schematic structural diagram of a first air tightness detection device for a tofu drying machine provided by an embodiment of the present invention;

[0035] Figure 3 This is a flow chart of a first method for detecting air tightness of a tofu drying machine drum provided by an embodiment of the present invention;

[0036] Figure 4 1 is a flow chart of a second method for detecting air tightness of a tofu drying machine drum provided by an embodiment of the present invention;

[0037] Figure 5It is a flow chart of a third method for detecting air tightness of a tofu drying machine drum provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0039] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] Figure 1 This is a schematic diagram of the structure of the first air tightness detection device for a tofu drying machine provided by an embodiment of the present invention, with reference to Figure 1As shown, an embodiment of the present invention provides an air tightness detection device 10 for a wire drying machine, which includes a steam input pipe 100, a wire drying machine drum 200, a condensed water discharge pipe 300, a bypass branch 400 and a switch assembly 500; the steam input pipe 100 and the condensed water discharge pipe 300 are respectively connected to the wire drying machine drum 200, the steam input pipe provides 100 steam for transmission to the wire drying machine drum 200, and the condensed water generated by the wire drying machine drum 200 is discharged through the condensed water discharge pipe 300; the bypass branch 400 includes a compressed air injection branch 410, a liquid injection branch 420 and a condensed water discharge branch 430 for detection, the compressed air injection branch 410 includes a first interface 411, the liquid injection branch 420 includes a second interface 421, and the condensed water discharge branch 430 includes a third interface 431, the first interface 411 and the second interface 421 are connected to the steam input pipe 100, and the second interface 421 is located at At the first interface 411 near the tow dryer drum 200, compressed air provided by the compressed air injection branch 410 is transmitted to the tow dryer drum 200, and liquid provided by the liquid injection branch 420 is transmitted to the tow dryer drum 200. The third interface 431 is connected to the condensate discharge pipeline 430, and the detection condensate generated by the tow dryer drum 200 is discharged through the detection condensate discharge branch 430. The switch assembly 500 includes a first valve 510, a second valve 520, a third valve 530, a fourth valve 540, and a fifth valve 550. The first valve 510 is located in the steam input pipeline 100 and is used to control the flow and cutoff of steam. The second valve 520 is located in the condensate discharge pipeline 300 and is used to control the flow and cutoff of condensate. The third valve 530 is located in the compressed air injection branch 410, the fourth valve 540 is located in the liquid injection branch 420, and the fifth valve 550 is located in the detection condensate discharge branch 430.

[0041] Among them, reference Figure 1 As shown, the tow dryer air tightness testing device 10 includes a steam input pipe 100, a tow dryer drum 200, and a condensate drain pipe 300. The steam input pipe 100 and the condensate drain pipe 300 are respectively connected to the tow dryer drum 200. The steam input pipe 100 provides steam for transmission to the tow dryer drum 200, and condensate generated by the tow dryer drum 200 is discharged through the condensate drain pipe 300. The steam input pipe 100, the tow dryer drum 200, and the condensate drain pipe 300 are combined to realize the production and use process of the tow dryer. Leaks in the steam input pipe 100 and the condensate drain pipe 300 can affect production and the working efficiency of the tow dryer drum 200. Therefore, air tightness testing of the steam input pipe 100 and the condensate drain pipe 300 is very important.

[0042] Furthermore, the air tightness detection device 10 for the tofu drying machine is provided with a bypass branch 400 on the steam input pipe 100 and the condensate drainage pipe 300. Figure 1 As shown, the bypass branch 400 includes a compressed air injection branch 410, a liquid injection branch 420 and a detection condensed water discharge branch 430. Specifically, the compressed air injection branch 410 includes a first interface 411, the liquid injection branch 420 includes a second interface 421, and the detection condensed water discharge branch 430 includes a third interface 431. The first interface 411 and the second interface 421 are both connected to the steam input pipe 100, that is, the compressed air injection branch 410 and the liquid injection branch 420 are connected to the steam input pipe 100; the third interface 431 is connected to the condensed water drainage pipe 300, that is, the detection condensed water discharge branch 430 is connected to the condensed water drainage pipe 300. In other words, two branches are added to the steam input pipe 100, namely the compressed air injection branch 410 and the liquid injection branch 420, and a branch is added to the condensed water drainage pipe 300, which is the detection condensed water discharge branch 430. Further, refer to Figure 1 As shown, the compressed air provided by the compressed air injection branch 410 can be transmitted to the wire drying drum 200, the liquid provided by the liquid injection branch 420 can be transmitted to the wire drying drum 200, and the detection condensed water generated by the wire drying drum 200 can be discharged through the detection condensed water discharge branch 430.

[0043] Furthermore, the air tightness detection device 10 for the tofu drying machine further includes a switch assembly 500, which is provided on each pipe and can control the conduction or shutoff of the pipe. Figure 1 As shown, the switch assembly 500 includes a first valve 510 and a second valve 520. The first valve 510 is located in the steam input pipeline 100 and is used to control the flow and shutoff of steam. The second valve 520 is located in the condensate discharge pipeline 300 and is used to control the flow and shutoff of condensate. When the first valve 510 and the second valve 520 are closed, the steam input pipeline 100 and the condensate discharge pipeline 300 form a preliminary sealed space. By utilizing the additional branch, the airtightness of the steam input pipeline 100 and the condensate discharge pipeline 300 can be determined.

[0044] For further reference, Figure 1As shown, the switch assembly 500 further includes a third valve 530, a fourth valve 540, and a fifth valve 550. The third valve 530 is located in the compressed air injection branch 410 and is used to control the conduction or shutoff of the compressed air injection branch 410. The fourth valve 540 is located in the liquid injection branch 420 and is used to control the conduction or pipeline of the liquid injection branch 420. The fifth valve 550 is located in the condensate discharge detection branch 430 and is used to control the conduction or shutoff of the condensate discharge detection branch 430. When the first valve 510 and the second valve 520 are in the closed state, the air tightness of the steam input pipeline 100 and the condensate discharge pipeline 300 can be tested by adjusting the conduction or shutoff of the third valve 530, the fourth valve 540, and the fifth valve 550.

[0045] Specifically, the added bypass branch 400 and the corresponding switch assembly 500 enable an airtightness test of the overall structure. The test process is as follows: the first valve 510 and the second valve 520 are controlled to be closed, thereby forming a preliminary sealed space between the steam input pipe 100, the condensate discharge pipe 300, and the tofu drying drum 200. Subsequently, pressure testing is performed within this preliminary sealed space to achieve an airtightness test of the steam input pipe 100 and the condensate discharge pipe 300. Furthermore, when the steam input pipe 100 and the condensate discharge pipe 300 are not in use, the third valve 530 and the fifth valve 550 are controlled to be open, allowing liquid provided by the liquid injection branch to be transferred to the tofu drying drum 200. When the condensed water is detected to flow out of the condensed water discharge branch 430 (i.e., the liquid provided by the liquid injection branch 420 to the wire drying drum 200 flows out through the condensed water discharge branch 430), the third valve 430 is closed, the fifth valve 550 is controlled to be closed, and the fourth valve 540 is controlled to be opened. In this case, the compressed air provided by the compressed air injection branch 410 can be transmitted to the wire drying drum 200, and the compressed air will not flow out after passing through the wire drying drum 200. Further, it is determined whether there is a leak in the steam input pipe 100 and the condensed water discharge pipe 300. Specifically, the leak can be determined by comparing the current air pressure value in the steam input pipe 100 with the air pressure value of the compressed air provided by the compressed air injection branch 410; or the equipment can be directly used to intuitively determine whether there is a leak in the steam input pipe and the condensed water discharge pipe. In general, the steam supply through the steam input pipe 100 and the condensate discharge through the condensate drain pipe 300 are cut off. The liquid injection branch 420 and the condensate discharge branch 430 in the additional bypass branch 400 are used to first expel any remaining air from the steam input pipe 100, the tofu drying drum 200, and the condensate drain pipe 300 to prevent it from affecting the subsequent air tightness test. The compressed air provided by the compressed air injection branch 410 in the bypass branch 400 is then used to perform an overall air tightness test, thus ensuring a more reliable and simplified test result. If the air tightness test is correct, the corresponding valves in the bypass branch 400 are closed, and the first valve 510 and the second valve 520 are controlled to be open, allowing the tofu drying drum 200 to resume normal production.

[0046] In summary, an embodiment of the present invention provides an air tightness detection device for a wire drying machine, comprising a bypass branch and a switch assembly, wherein the bypass branch comprises a compressed air injection branch, a liquid injection branch and a detection condensed water discharge branch, the compressed air provided by the compressed air injection branch is transmitted to the wire drying machine drum, and the liquid provided by the liquid injection branch is transmitted to the wire drying machine drum; the detection condensed water generated by the wire drying machine drum is discharged through the detection condensed water discharge branch; the switch assembly comprises a first valve, a second valve, a third valve, a fourth valve and a fifth valve; the first valve is used to control the flow and cutoff of steam; the second valve is used to control the flow and cutoff of condensed water; the third valve is located in the compressed air injection branch, the fourth valve is located in the liquid injection branch, and the fifth valve is located in the detection condensed water discharge branch. By adding a bypass branch and adjusting its conduction state, the air tightness detection of the wire drying machine drum can be better achieved.

[0047] Continue to refer Figure 1 As shown, the third valve 530 includes a first solenoid valve, the fourth valve 540 includes a second solenoid valve, and the fifth valve 550 includes a needle valve.

[0048] For further reference, Figure 1 As shown, the third valve 530 and the fourth valve 540 can be solenoid valves, which can be used in conjunction with different circuits to achieve the desired control, while ensuring both the accuracy and flexibility of the control. Specifically, the third valve 530 includes a first solenoid valve, and the fourth valve 540 includes a second solenoid valve. Further, refer to Figure 1 As shown, the fourth valve 540 may be a needle valve, which is a fine-tuning valve whose valve plug is needle-shaped and is mainly used to adjust the gas flow.

[0049] Continue to refer Figure 1 As shown, the first valve 510 includes a first stop valve, and the second valve 520 includes a second stop valve.

[0050] For further reference, Figure 1 As shown, the first valve 510 and the second valve 520 can be stop valves, which are also called gate valves and are forced sealing valves. By providing stop valves on the steam input pipeline 100 and the condensate discharge pipeline 300, more accurate control of steam and condensate can be ensured.

[0051] Continue to refer Figure 1 As shown, the tofu drying machine air tightness detection device 10 further includes a pressure gauge 600 . The pressure gauge 600 is located on the steam input pipe 100 and between the second interface 421 and the first interface 411 .

[0052] For further reference, Figure 1As shown, the air tightness detection device 10 for the tofu drying machine further includes a pressure gauge 600, which can detect the air pressure value in the pipe. Specifically, the pressure gauge 600 is set on the steam input pipe 100, so the pressure gauge 600 can detect the air pressure value of the steam input pipe 100. And refer to Figure 1 As shown, the barometer 600 is located between the second interface 421 and the first interface 411. In this way, when steam is not passed into the steam input pipe 100 but compressed air is injected into the tow drying machine drum 200 through the compressed air injection branch 410, the barometer 600 is used to detect the pressure value of the compressed air in the steam input pipe 100.

[0053] Specifically, when the value of the barometer is a and the compressed gas provided by the compressed air injection branch 410 is b, b is the pressure value of the compressed gas, and the units of a and b are Pascals. Determine whether the following is satisfied within the first preset time: (ba) / b≤0.3. For example, where the first preset time is a set observation time, such as 4 hours, when a is 0.4Mpa and b is 0.6Mpa, (ba) / b≤0.3 is satisfied, which proves that there are no leaks in the steam input pipe 100 and the condensate discharge pipe 300, so the current overall structure has good air tightness and can be put into production; if (ba) / b≤0.3 is not satisfied, it proves that there are leaks in the steam input pipe 100 and the condensate discharge pipe 300, so the current overall structure has poor air tightness and needs to be maintained or replaced. The specific value of the first preset time can be adaptively adjusted according to actual needs, and the embodiment of the present invention does not specifically limit this.

[0054] Figure 2 This is a schematic diagram of the structure of the first air tightness detection device for a tofu drying machine provided by an embodiment of the present invention, with reference to Figure 2 As shown, the tofu drying machine air tightness detection device 10 further includes a liquid detection device 700 , which is located on the condensed water discharge branch 530 , and is located on a side of the third interface 431 away from the condensed water discharge pipeline 300 .

[0055] For further reference, Figure 2As shown, the air tightness detection device 10 for the wire drying machine also includes a liquid detection device 700. The liquid detection device 700 can be located on the detection condensed water discharge branch 530 to detect whether there is flowing liquid on the condensed water discharge branch 530. Specifically, the liquid detection device 700 is located on the side of the third interface 431 away from the condensed water discharge pipeline 300. This can be understood as the liquid detection device 700 being located at the outlet of the detection condensed water discharge branch 530. By adding the liquid detection device 700, the flow judgment of the liquid in the condensed water discharge branch 530 can be guaranteed to be accurate, timely and reliable. When the air tightness detection is performed in the wire drying machine air tightness detection device 10 with the help of a control center (such as an editable logic device, etc.), the liquid detection device 700 is connected to the control center, and the judgment of the liquid flow in the condensed water discharge branch 530 is more reliable.

[0056] Continue to refer Figure 2 As shown, the air tightness detection device 10 for the tofu drying machine further includes a water injection amount detection device 800 , which is connected to the tofu drying machine drum 200 .

[0057] For further reference, Figure 2 As shown, the air tightness detection device 10 for the wire drying machine also includes a water injection amount detection device 800, which can be used to detect the amount of liquid in the connection setting. When the water injection amount detection device 800 is connected to the wire drying machine drum 200, the water injection amount detection device 800 is used to detect the amount of liquid in the wire drying machine drum 200.

[0058] Specifically, the tow dryer air tightness detection device 10 utilizes liquid provided by the liquid injection branch 420 to be transferred into the tow dryer drum 200, thereby expelling any remaining air. Specifically, during this process, the liquid injection branch 420 and the condensate discharge detection branch 430 are in a conductive state. Liquid provided by the liquid injection branch 420 is transferred to the tow dryer drum 200 via a portion of the steam input pipeline 100. The tow dryer drum 200 then discharges the liquid through the condensate discharge detection branch 430. Therefore, during this process, the amount of liquid in the tow dryer drum 200 should be fixed within a certain range. If the amount does not exceed this range, it indicates that the remaining air has not been completely expelled. If the amount exceeds this range, it indicates that there is an abnormality in the fifth valve 550 in the condensate discharge detection branch 430, preventing the liquid from being discharged through the condensate discharge detection branch 430. Therefore, the addition of the water injection amount detection device 800 ensures that the air tightness detection device 10 for tow dryers is safer and more reliable.

[0059] Continue to refer Figure 2As shown, the tofu drying machine air tightness detection device 10 also includes a leakage point detection device 900, which includes a first leakage point detection unit 910 and a second leakage point detection unit 920; the first leakage point detection unit 910 is located in the steam input pipe 100, and the second leakage point detection unit 920 is located in the condensate discharge pipe 300.

[0060] For further reference, Figure 2 As shown, the tofu drying machine air tightness detection device 10 also includes a leak detection device 900, which includes a first leak detection unit 910 located in the steam input pipe 100 and a second leak detection unit 920 located in the condensate discharge pipe 300. The provision of the leak detection device 900 allows for more accurate leak detection, determining whether there are leaks in the steam input pipe 100 and the condensate discharge pipe 300, thereby ensuring more reliable air tightness detection results.

[0061] Based on the same invention communication, the embodiment of the present invention also provides a method for detecting the air tightness of the tofu drying machine drum. Figure 3 This is a flow chart of the first method for detecting air tightness of a tofu drying machine drum provided by an embodiment of the present invention, with reference to Figure 3 As shown in the figure, the method for testing the air tightness of the tofu drying machine drum includes:

[0062] S110 , controlling the first valve to close and controlling the second valve to close.

[0063] The tow dryer air tightness testing device includes a steam input pipe, a tow dryer drum, and a condensate drain pipe. The steam input pipe and the condensate drain pipe are connected to the tow dryer drum, respectively. Steam provided by the steam input pipe is transmitted to the tow dryer drum, and condensate generated by the tow dryer drum is discharged through the condensate drain pipe. Together, the steam input pipe, the tow dryer drum, and the condensate drain pipe ensure the tow dryer is operational. Leaks in the steam input pipe and the condensate drain pipe can affect production and the operating efficiency of the tow dryer drum, making air tightness testing of the steam input pipe and the condensate drain pipe extremely important.

[0064] Furthermore, the tofu drying machine air tightness detection device also includes a switch assembly, which is installed on each pipeline to control the flow or shutoff of the pipeline. Specifically, the switch assembly includes a first valve and a second valve. The first valve is located in the steam input pipeline and is used to control the flow and shutoff of steam; the second valve is located in the condensate discharge pipeline and is used to control the flow and shutoff of condensate. When the first and second valves are closed, the steam input pipeline and the condensate discharge pipeline form a preliminary sealed space, and the air tightness of the steam input pipeline and the condensate discharge pipeline can be determined by utilizing the additional branch line.

[0065] Specifically, the first valve and the second valve are controlled to be closed, so that the steam input pipe, the condensate discharge pipe and the tow drying machine drum can form a preliminary sealed space. Subsequently, the pressure is tested in the preliminary sealed space to achieve the air tightness test of the steam input pipe and the condensate discharge pipe.

[0066] S120 , controlling the third valve to open and controlling the fifth valve to open.

[0067] S130 , when detecting condensed water flowing out of the condensed water discharge branch, controlling the third valve to close and the fifth valve to close, and controlling the fourth valve to open.

[0068] Specifically, the air tightness detection device for the wire drying machine adds a bypass branch to the steam input pipe and the condensate drainage pipe. The bypass branch includes a compressed air injection branch, a liquid injection branch, and a detection condensate discharge branch. Specifically, the compressed air injection branch includes a first interface, the liquid injection branch includes a second interface, and the detection condensate discharge branch includes a third interface. The first interface and the second interface are both connected to the steam input pipe, that is, the compressed air injection branch and the liquid injection branch are connected to the steam input pipe; the third interface is connected to the condensate drainage pipe, that is, the detection condensate discharge branch is connected to the condensate drainage pipe. In other words, two branches are added to the steam input pipe, namely the compressed air injection branch and the liquid injection branch, and a branch is added to the condensate drainage pipe to serve as the detection condensate discharge branch. Furthermore, the compressed air provided by the compressed air injection branch can be transmitted to the wire drying machine drum, and the liquid provided by the liquid injection branch can be transmitted to the wire drying machine drum. The detection condensate generated by the wire drying machine drum can be discharged through the detection condensate discharge branch.

[0069] Furthermore, the switch assembly also includes a third valve, a fourth valve, and a fifth valve. The third valve is located in the compressed air injection branch and is used to control the conduction or shutoff of the compressed air injection branch; the fourth valve is located in the liquid injection branch and is used to control the conduction or pipeline of the liquid injection branch; and the fifth valve is located in the condensate discharge detection branch and is used to control the conduction or shutoff of the condensate discharge detection branch. When the first valve and the second valve are in the closed state, the air tightness of the steam input pipeline and the condensate discharge pipeline can be tested by adjusting the conduction or shutoff of the third valve, the fourth valve, and the fifth valve.

[0070] Specifically, when the steam input pipeline and condensate discharge pipeline are not in use, the third and fifth valves are controlled to open, allowing liquid provided by the liquid injection branch to be transferred to the dryer drum. When detection condensate flows out of the condensate discharge branch (i.e., liquid provided to the dryer drum by the liquid injection branch flows out through the condensate discharge branch), the third valve is closed, the fifth valve is controlled to close, and the fourth valve is controlled to open. In this case, compressed air provided by the compressed air injection branch can be transferred to the dryer drum, and the compressed air will not flow out after passing through the dryer drum.

[0071] S140: Determine whether there are leaks in the steam input pipeline and the condensate discharge pipeline.

[0072] Specifically, the leak point can be determined by comparing the current air pressure value in the steam input pipeline with the air pressure value provided by the compressed air injection branch; or the equipment can be directly used to intuitively determine whether there is a leak in the steam input pipeline and the condensate discharge pipeline. In general, the steam provided by the steam input pipeline and the condensate discharged through the condensate discharge pipeline will be cut off. According to the liquid injection branch and the condensate discharge branch in the added bypass branch, the remaining air in the original steam input pipeline, the tow dryer drum and the condensate discharge pipeline will be discharged first to avoid affecting the subsequent air tightness test results. The compressed air provided by the compressed air injection branch in the bypass branch is then used to test the overall air tightness, thus ensuring that the test results are more reliable and simple. If the air tightness test is correct, the corresponding valve in the bypass branch is closed, and then the conduction of the first valve and the second valve is controlled, so that the tow dryer drum can be put into normal production.

[0073] In summary, the embodiment of the present invention provides a method for detecting air tightness of a tofu drying machine, which controls the third valve to open and the fifth valve to open; controls the third valve to open and the fifth valve to open; when detecting the outflow of condensed water from the condensate discharge branch, controls the third valve to close and the fifth valve to close, and controls the fourth valve to open; finally, determines whether there are leaks in the steam input pipeline and the condensate discharge pipeline. By adding a bypass branch and adjusting its conduction state, the air tightness detection of the tofu drying machine drum can be better achieved.

[0074] Optional, Figure 4 This is a flow chart of the second method for detecting air tightness of a tofu drying machine drum provided by an embodiment of the present invention, with reference to Figure 4 As shown, the method for detecting air tightness of the tofu drying machine drum also includes:

[0075] S210 , controlling the first valve to close and controlling the second valve to close.

[0076] S220 , controlling the third valve to open and controlling the fifth valve to open.

[0077] S230: When detecting condensed water flowing out of the condensed water discharge branch, control the third valve to be closed and the fifth valve to be closed, and control the fourth valve to be open.

[0078] S240: Obtain the value a of the barometer.

[0079] S250: Determine whether (b a ) / b ≤ 0.3 is satisfied within the first preset time.

[0080] For further reference, Figure 1 As shown, the air tightness detection device 10 for the tofu drying machine further includes a pressure gauge 600, which can detect the air pressure value in the pipe. Specifically, the pressure gauge 600 is set on the steam input pipe 100, so the pressure gauge 600 can detect the air pressure value of the steam input pipe 100. And refer to Figure 1 As shown, the barometer 600 is located between the second interface 421 and the first interface 411. In this way, when steam is not passed into the steam input pipe 100 but compressed air is injected into the tow drying machine drum 200 through the compressed air injection branch 410, the barometer 600 is used to detect the pressure value of the compressed air in the steam input pipe 100.

[0081] Specifically, if the barometer value is a and the compressed gas provided by the compressed air injection branch 410 is b, where b is the pressure of the compressed gas and the units of a and b are Pascals, it is determined whether (b a ) / b ≤ 0.3 is satisfied within the first preset time.

[0082] S260: If the conditions are met, it proves that there are no leaks in the steam input pipeline and the condensate discharge pipeline.

[0083] S270: If not met, it proves that there are leaks in the steam input pipeline and condensate discharge pipeline.

[0084] For example, the first preset time is a set observation time, such as 4 hours. When a is 0.4 MPa and b is 0.6 MPa, if (ba) / b≤0.3 is satisfied, it is confirmed that there are no leaks in the steam input pipe 100 and the condensate discharge pipe 300, and therefore the overall structure is currently airtight and can be put into production. If (ba) / b≤0.3 is not satisfied, it is confirmed that there are leaks in the steam input pipe 100 and the condensate discharge pipe 300, and therefore the overall structure is currently airtight and needs maintenance or replacement. The specific value of the first preset time can be adaptively adjusted according to actual needs and is not specifically limited in this embodiment of the present invention.

[0085] Optional, Figure 5This is a flow chart of the third method for detecting air tightness of a tofu drying machine drum provided by an embodiment of the present invention, with reference to Figure 5 As shown, the air tightness detection method of the wire machine drum also includes:

[0086] S310: Control the first valve to close and control the second valve to close.

[0087] S320: Control the third valve to open and control the fifth valve to open.

[0088] S330: When detecting condensed water flowing out of the condensed water discharge branch, control the third valve to be closed and the fifth valve to be closed, and control the fourth valve to be open.

[0089] S340: Obtain a first leakage point detection result of the first leakage point detection unit.

[0090] S350: Obtain a second leakage point detection result of the second leakage point detection unit.

[0091] S360: Determine whether there are leaks in the steam input pipeline and the condensate discharge pipeline based on the first leak point detection result and the second leak point detection result.

[0092] Further, combined Figure 2 As shown, the tofu drying machine air tightness detection device 10 also includes a leak detection device 900, which includes a first leak detection unit 910 located in the steam input pipe 100 and a second leak detection unit 920 located in the condensate discharge pipe 300. The provision of the leak detection device 900 allows for more accurate leak detection, determining whether there are leaks in the steam input pipe 100 and the condensate discharge pipe 300, thereby ensuring more reliable air tightness detection results.

[0093] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A tofu drying machine air tightness detection device, characterized in that: Including steam input pipeline, tofu drying drum, condensate discharge pipeline, bypass branch and switch assembly; The steam input pipe and the condensed water discharge pipe are respectively connected to the wire drying drum, the steam provided by the steam input pipe is transmitted to the wire drying drum, and the condensed water generated by the wire drying drum is discharged through the condensed water discharge pipe; The bypass branch includes a compressed air injection branch, a liquid injection branch, and a detection condensed water discharge branch. The compressed air injection branch includes a first interface, the liquid injection branch includes a second interface, and the detection condensed water discharge branch includes a third interface. The first interface and the second interface are connected to the steam input pipe, and the second interface is located near the first interface and the wire drying drum. The compressed air provided by the compressed air injection branch is transmitted to the wire drying drum, and the liquid provided by the liquid injection branch is transmitted to the wire drying drum; the third interface is connected to the condensed water discharge pipeline, and the detection condensed water generated by the wire drying drum is discharged through the detection condensed water discharge branch. The switch assembly includes a first valve, a second valve, a third valve, a fourth valve and a fifth valve; the first valve is located in the steam input pipeline, and the first valve is used to control the flow and cutoff of the steam; the second valve is located in the condensate discharge pipeline, and the second valve is used to control the flow and cutoff of the condensate; the third valve is located in the compressed air injection branch, the fourth valve is located in the liquid injection branch, and the fifth valve is located in the detected condensate discharge branch.

2. The air tightness detection device for a tofu drying machine according to claim 1, characterized in that: The third valve includes a first solenoid valve, the fourth valve includes a second solenoid valve, and the fifth valve includes a needle valve.

3. The air tightness detection device for a tofu drying machine according to claim 1, characterized in that: The first valve includes a first stop valve, and the second valve includes a second stop valve.

4. The air tightness detection device for a tofu drying machine according to claim 1, characterized in that: The air tightness detection device for the tofu drying machine further includes a pressure gauge, which is located on the steam input pipe and between the second interface and the first interface.

5. The air tightness detection device for tofu drying machine according to claim 1, characterized in that: The air tightness detection device of the tow dryer further includes a liquid detection device, which is located on the condensed water discharge branch, and the liquid detection device is located on a side of the third interface away from the condensed water discharge pipeline.

6. The air tightness detection device for tofu drying machine according to claim 1, characterized in that: The air tightness detection device of the wire drying machine also includes a water injection amount detection device, and the water injection amount detection device is connected to the wire drying machine drum.

7. The air tightness detection device for a tofu drying machine according to claim 1, characterized in that: The air tightness detection device of the tofu drying machine also includes a leakage point detection device, which includes a first leakage point detection unit and a second leakage point detection unit; the first leakage point detection unit is located in the steam input pipeline, and the second leakage point detection unit is located in the condensate discharge pipeline.

8. A method for detecting air tightness of a tofu drying drum, using the tofu drying drum air tightness detection device according to any one of claims 1 to 7, characterized in that: The method for detecting air tightness of a tofu drying machine drum comprises: controlling the first valve to close and controlling the second valve to close; Controlling the third valve to open and controlling the fifth valve to open, so that the liquid provided by the liquid injection branch is transmitted to the tow drying machine drum; When the detection condensed water flows out of the detection condensed water discharge branch, the third valve is controlled to be closed and the fifth valve is controlled to be closed, and the fourth valve is controlled to be opened; the compressed air provided by the compressed air injection branch is transmitted to the tow drying machine drum; Determine whether there are leaks in the steam input pipeline and the condensate discharge pipeline.

9. The method for detecting air tightness of a tofu drying drum according to claim 8, characterized in that: The air tightness detection device for the tofu drying machine further includes a pressure gauge, which is located on the steam input pipe and between the second interface and the first interface; Determining whether there are leaks in the steam input pipeline and the condensate discharge pipeline includes: Obtain the value a of the barometer, and the compressed air provided by the compressed air injection branch is b; Determine whether (ba) / b≤0.3 is satisfied within the first preset time; If the conditions are met, it proves that there are no leaks in the steam input pipeline and the condensate discharge pipeline; If it is not satisfied, it proves that there are leaks in the steam input pipeline and the condensate discharge pipeline.

10. The method for detecting air tightness of a tofu drying drum according to claim 8, characterized in that: The air tightness detection device of the tofu drying machine also includes a leakage detection device, which includes a first leakage detection unit and a second leakage detection unit; the first leakage detection unit is located in the steam input pipeline, and the second leakage detection unit is located in the condensate discharge pipeline; Determining whether there are leaks in the steam input pipeline and the condensate discharge pipeline includes: Obtaining a first leakage point detection result of the first leakage point detection unit; Obtaining a second leakage point detection result of the second leakage point detection unit; It is determined whether there are leaks in the steam input pipeline and the condensate discharge pipeline according to the first leak point detection result and the second leak point detection result.

Images