A vacuum pipeline and vacuum nozzle sealing performance detection device and method

Abstract

The present invention belongs to the technical field of vacuum bag pressing forming detection, and particularly relates to a vacuum pipeline and vacuum nozzle sealing detection device and method. It includes: a device main body, a common adapter A, a common adapter B, a ball valve, and a vacuum gauge; the device main body is rectangular, with a hollow cavity inside, and there is a round hole on the upper end surface of the device main body communicating with the hollow cavity; there are connection ports on the left and right end surfaces of the device main body communicating with the hollow cavity; the common adapter A and the common adapter B are fixedly connected to the connection ports on the left and right end surfaces of the device main body respectively; the common adapter A is connected to the vacuum gauge, and there is a ball valve A inside the common adapter B; the round hole serves as a vacuum detection interface and is connected to the vacuum pipeline or vacuum nozzle to be detected, the common adapter B serves as a vacuum detection interface and is connected to the vacuum pipeline to be measured, and the ball valve A is used to control the on-off of the common adapter B.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum bag pressing forming detection, and particularly relates to a detection device and method for the sealing performance of a vacuum pipeline and a vacuum nozzle. Background Art

[0002] Vacuum bag pressing forming is an important composite material forming technology. The vacuum degree in the vacuum bag is closely related to the internal porosity of the composite material part, has an important influence on the mechanical properties and bonding conditions of the composite material part, and if the vacuum does not meet the requirements during the curing process, it often causes the part to be scrapped. The vacuum nozzle and the vacuum pipeline are connection systems connecting the vacuum bag and the vacuum pump of the oven or autoclave, and their connection sealing performance will affect the vacuum degree in the vacuum bag. In actual production, the vacuum pipeline and the vacuum nozzle are often not produced in the same batch or by the same manufacturer, and there are problems of low fit and poor sealing performance; after long-term use of the vacuum pipeline and the vacuum nozzle, rust and wear problems at the interface will also cause the sealing performance to deteriorate. Before the vacuum nozzle and the vacuum pipeline are used, there is no detection device that can directly connect to the vacuum nozzle to detect the sealing condition of its interface with the vacuum pipeline. Usually, it is necessary to seal the vacuum bag and the vacuum nozzle with a sealing strip to form a closed system, and use a vacuum gauge to detect the vacuum degree of the system to reflect the sealing condition at the connection between the vacuum nozzle and the vacuum pipeline. Summary of the Invention

[0003] The invention provides a detection device and method for the sealing performance of a vacuum pipeline and a vacuum nozzle, which can quickly detect the sealing performance at the interface between the vacuum nozzle and the vacuum pipeline, does not require sealing the vacuum bag, effectively avoids the unqualified vacuum nozzles from flowing into the production site, can timely remove the worn and rusted vacuum pipelines and vacuum nozzles during production, and reduces the incidence of vacuum leakage problems caused by the poor sealing between the vacuum nozzle and the vacuum pipeline.

[0004] A detection device for the sealing performance of a vacuum pipeline and a vacuum nozzle comprises: a device main body, a common adapter A, a common adapter B, a ball valve, and a vacuum gauge;

[0005] The device main body is rectangular, with a hollow cavity inside. There is a round hole on the upper end face of the device main body communicating with the hollow cavity; there are connection interfaces on the left and right end faces of the device main body communicating with the hollow cavity;

[0006] The connection interfaces on the left and right end faces of the device main body are respectively fixedly connected with the common adapter A and the common adapter B;

[0007] The common adapter A is connected to the vacuum gauge, and a ball valve A is arranged inside the common adapter B;

[0008] The round hole serves as a vacuum detection interface and is connected to the vacuum nozzle to be detected;

[0009] The common adapter B serves as a vacuum detection interface and is connected to the interface of the vacuum pipeline to be detected;

[0010] The ball valve A is used to control the on-off of the ordinary adapter B.

[0011] Furthermore, a ball valve B is provided inside the ordinary adapter A.

[0012] Furthermore, the stiffness of the device body needs to withstand a vacuum pressure of more than 0.1 MPa.

[0013] A method for detecting the sealing performance of a vacuum pipeline and a vacuum nozzle. The method is implemented by the described device, and the method includes the following steps:

[0014] Step 1: Detect the sealing performance of the device.

[0015] Step 2: Seal the vacuum detection interface, connect the vacuum pipeline of the vacuum oven or autoclave to the ordinary adapter B, and open the ball valve A.

[0016] Step 3: Control the operation of the vacuum system of the vacuum oven or autoclave, and judge the sealing performance of the vacuum pipeline of the vacuum oven or autoclave according to the vacuum degree shown on the vacuum gauge.

[0017] Step 4: Close the ball valve A, seal one end of the vacuum nozzle to be tested to the vacuum detection interface, and connect the other end of the vacuum nozzle to be tested to the vacuum pipeline of the vacuum oven or autoclave.

[0018] Step 5: Control the operation of the vacuum system of the vacuum oven or autoclave until the absolute value of the vacuum degree shown on the vacuum gauge is not less than 0.098 MPa and is maintained for at least 5 minutes. Then close the vacuum system of the oven or autoclave, and judge the sealing performance of the vacuum nozzle to be tested of the vacuum oven or autoclave according to the change of the vacuum degree shown on the vacuum gauge.

[0019] Furthermore, in Step 1, the sealing performance of the device is detected through the following process: seal the vacuum detection interface, connect the ordinary adapter B to the vacuum system, open the ball valve A, control the operation of the vacuum system until the absolute value of the system vacuum degree shown on the vacuum gauge is not less than 0.098 MPa and is maintained for at least 5 minutes, then close the vacuum system of the oven or autoclave, and judge whether the vacuum degree of the device is good according to the reading of the change of the vacuum degree shown on the vacuum gauge.

[0020] Furthermore, Step 3 also includes: if the sealing performance of the vacuum pipeline of the vacuum oven or autoclave is good, then continue with Steps 4 and 5; if the sealing performance of the vacuum pipeline of the vacuum oven or autoclave is poor, then replace the vacuum pipeline and continue with Steps 4 and 5.

[0021] Furthermore, good sealing performance means that the absolute value of the vacuum degree shown on the vacuum gauge drops by no more than 0.002 MPa within 10 minutes after the vacuum system is closed.

[0022] Furthermore, the poor sealing performance means that the absolute value of the vacuum degree shown by the vacuum gauge drops by more than 0.002 Mpa within 10 minutes after the vacuum system is closed.

[0023] Beneficial effects: This application can conveniently detect the sealing condition at the joint between the vacuum nozzle and the vacuum pipeline. After removing the vacuum nozzles that do not fit well with the vacuum pipeline, it can save the power consumption for leak plugging in the autoclave, waste of auxiliary materials, and labor costs. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of a device for detecting the sealing performance of a vacuum pipeline and a vacuum nozzle;

[0025] 1 Commercial vacuum gauge; 2 Ordinary adapter A; 3 Device main body; 4 Ordinary adapter B; 5 Ball valve A; 6 Vacuum nozzle to be tested. Specific Embodiments

[0026] Refer to Figure 1 A device for detecting the sealing performance of a vacuum pipeline and a vacuum nozzle is composed of a commercial vacuum gauge 1, an ordinary adapter A 2, a device main body 3, an ordinary adapter B 4, and a ball valve A 5.

[0027] Among them, the device main body 3 has a hollow structure with good sealing performance and rigidity, and can withstand a vacuum pressure of more than 0.1 MPa. The round hole above the device main body 3 can be obtained by machining, and the recommended diameter is 10 mm to 20 mm, which serves as the detection port for the vacuum nozzle 6 to be tested; the ordinary adapter A 2 and the ordinary adapter B 4 can be connected to the device main body 3 by welding; the commercial vacuum gauge 1 is connected to the device main body through threaded connection with the ordinary adapter A 2; the other end of the ordinary adapter B 4 can be connected to the vacuum pipeline joint, and a ball valve A 5 is provided on the ordinary adapter B 4 to control the on-off of the adapter B 4.

[0028] Before using the device, its own sealing performance needs to be checked. The method is as follows: Seal the detection interface of the vacuum nozzle 6, connect the ordinary adapter B 4 to the vacuum system, open the ball valve A 5, control the vacuum system to work until the absolute value of the vacuum degree shown by the vacuum gauge 1 is greater than or equal to 0.098 MPa and remains for at least 5 minutes, then close the vacuum system. If the absolute value of the vacuum degree shown by the vacuum gauge 1 drops by no more than 0.002 MPa within 10 minutes, it means that the sealing performance of the detection device itself is good and it can be put into use.

[0029] Example 1: Detection of the Sealing Performance of the Vacuum Pipeline in a Vacuum Oven

[0030] (1) Seal the vacuum nozzle detection port on the upper end face of the device main body with a sealing rubber strip;

[0031] (2) Connect the self-locking joint of the vacuum pipeline of the vacuum oven to be tested to the ordinary adapter B of the detection device, and tighten the self-locking joint with a wrench. Vacuum grease can be applied at the joint for better sealing performance.

[0032] (3) Turn on the vacuum system of the vacuum oven, keep the ball valve 5 in the normally open state. After the absolute vacuum degree shown on the vacuum gauge is greater than or equal to 0.098 MPa and is maintained for at least 5 minutes, turn off the vacuum system;

[0033] (4) Observe the reading of the commercially available vacuum gauge. If the absolute value of the vacuum degree shown on the vacuum gauge 1 does not decrease by more than 0.002 MPa within 10 minutes, the state of this vacuum pipeline is good and it can continue to be put into use; if the absolute value of the vacuum degree decreases by more than 0.002 MPa, the pipeline should be replaced in time.

[0034] Example 2: Detection of the sealing performance between the vacuum nozzle of the vacuum oven and the vacuum pipeline

[0035] (1) According to the steps of Example 1, detect that the sealing performance of the vacuum pipeline is good;

[0036] (2) Seal the vacuum nozzle to the vacuum nozzle detection port of the detection device, and keep the vacuum nozzle in communication with the cavity of the device body;

[0037] (3) Connect the vacuum pipeline to the vacuum nozzle, and use a wrench to tighten the self-locking joint of the vacuum pipeline and the vacuum nozzle thread. Vacuum silicone grease can be applied at the joint to obtain better sealing performance;

[0038] (4) Keep the ball valve 5 in the normally closed state, turn on the vacuum system of the vacuum oven. After the absolute vacuum degree shown on the vacuum gauge is greater than or equal to 0.098 MPa and is maintained for at least 5 minutes, turn off the vacuum system;

[0039] (5) Observe the reading of the commercially available vacuum gauge. If the absolute value of the vacuum degree shown on the vacuum gauge 1 does not decrease by more than 0.002 MPa within 10 minutes, the connection sealing performance between the vacuum nozzle and the vacuum pipeline is good; if the absolute value of the vacuum degree decreases by more than 0.002 MPa, the vacuum nozzle should be replaced in time.

[0040] Example 3: Detection of the sealing performance of the vacuum pipeline of the autoclave.

[0041] (1) Seal the upper end face vacuum nozzle detection port of the detection device with a sealing rubber strip;

[0042] (2) Connect the self-locking joint of the vacuum pipeline of the autoclave to be tested with the ordinary adapter B of the detection device, and use a wrench to tighten the self-locking joint. Vacuum silicone grease can be applied at the joint to obtain better sealing performance;

[0043] (3) Turn on the vacuum system of the autoclave, keep the ball valve 5 in the normally open state. After the absolute vacuum degree shown on the vacuum gauge is greater than or equal to 0.098 MPa and is maintained for at least 5 minutes, turn off the vacuum system;

[0044] (4) Observe the reading of the commercially available vacuum gauge. If the absolute value of the vacuum degree shown on the vacuum gauge 1 does not decrease by more than 0.002 MPa within 10 minutes, the vacuum pipeline is in good condition and can continue to be put into use; if the absolute value of the vacuum degree decreases by more than 0.002 MPa, the pipeline should be replaced in time.

[0045] Example 4: Detection of the sealing performance of the connection between the vacuum nozzle of the autoclave and the vacuum pipeline.

[0046] (1) According to the steps of Example 3, detect that the sealing performance of the vacuum pipeline is good;

[0047] (2) Seal the edge of the vacuum nozzle to the vacuum nozzle detection port of the detection device with a sealing strip, and keep the vacuum nozzle communicating with the cavity of the device body;

[0048] (3) Connect the vacuum pipeline to the vacuum nozzle, and tighten the self-locking joint of the vacuum pipeline and the vacuum nozzle thread with a wrench. If necessary, vacuum grease can be applied at the joint;

[0049] (4) Keep the ball valve 5 in the normally closed state, turn on the vacuum system of the vacuum oven. After the absolute value of the vacuum degree shown on the vacuum gauge is greater than or equal to 0.098 MPa and remains for at least 5 minutes, turn off the vacuum system;

[0050] (5) Observe the reading of the commercially available vacuum gauge. If the absolute value of the vacuum degree shown on the vacuum gauge does not decrease by more than 0.002 MPa within 10 minutes, the connection sealing performance between the vacuum nozzle and the vacuum pipeline is good; if the absolute value of the vacuum degree decreases by more than 0.002 MPa, the vacuum nozzle should be replaced in time.

Claims

1. A method for detecting the sealing performance of a vacuum pipeline and a vacuum nozzle, characterized in that: The method is implemented based on a sealing detection device, which includes: a device main body, a common adapter A, a common adapter B, a ball valve, and a vacuum gauge; The device main body is rectangular, with a hollow cavity inside. There is a round hole on the upper end face of the device main body, which is connected to the hollow cavity; there are connection ports on the left and right end faces of the device main body, which are connected to the hollow cavity; The common adapter A and the common adapter B are respectively fixedly connected to the connection ports on the left and right end faces of the device main body; The common adapter A is connected to the vacuum gauge, and there is a ball valve A inside the common adapter B; The round hole serves as a vacuum detection interface and is connected to the vacuum nozzle to be tested; The common adapter B serves as a detection interface and is connected to the vacuum pipeline to be tested; The ball valve A is used to control the on-off of the common adapter B; The method includes the following steps: Step 1: Detect the sealing performance of the device; Step 2: Seal the vacuum detection interface, connect the vacuum pipeline of the vacuum oven or autoclave to the common adapter B, and open the ball valve A; Step 3: Control the operation of the vacuum system of the vacuum oven or autoclave, and judge the sealing performance of the vacuum pipeline of the vacuum oven or autoclave according to the vacuum degree shown on the vacuum gauge; Step 4: Close the ball valve A, seal one end of the vacuum nozzle to be tested and connect it to the vacuum detection interface, and connect the other end of the vacuum nozzle to be tested to the vacuum pipeline of the vacuum oven or autoclave; Step 5: Control the operation of the vacuum system of the vacuum oven or autoclave, and judge the sealing performance of the vacuum nozzle to be tested of the vacuum oven or autoclave according to the vacuum degree shown on the vacuum gauge.

2. The method according to claim 1, wherein: There is a ball valve B inside the common adapter A.

3. The method according to claim 1, wherein: The device main body can withstand a vacuum pressure value greater than 0.1 MPa, and the material includes but is not limited to metal.

4. The method according to claim 1, wherein: In the first step, the sealing performance of the device is detected through the following process: seal the vacuum detection interface, connect the common adapter B to the vacuum system, open the ball valve A, control the operation of the vacuum system, and judge whether the vacuum degree of the device is good according to the reading of the vacuum gauge.

5. The method according to claim 4, wherein: The third step also includes: if the vacuum pipeline of the vacuum oven or autoclave has good sealing performance, then continue with steps four and five; if the vacuum pipeline of the vacuum oven or autoclave has poor sealing performance, then replace the vacuum pipeline and continue with steps four and five.

6. The method according to claim 5, characterized in that: Good sealing performance means that the absolute value of the vacuum degree shown on the vacuum gauge does not decrease by more than 0.002 MPa within 10 minutes after the vacuum system is closed.

7. The method according to claim 5, characterized in that: Poor sealing performance means that the absolute value of the vacuum degree shown on the vacuum gauge decreases by more than 0.002 MPa within 10 minutes after the vacuum system is closed.

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