A seal test device for injection molded parts

Abstract

The utility model discloses a kind of sealing test devices of injection molding sample, comprising: detection base, the detection base is provided with detection lower cavity, the ejection mechanism is installed in the detection lower cavity;Detection upper cover, the detection upper cover can be vertically moved, the detection upper cover is installed in detection base upper end, sealing ring is arranged between the detection upper cover and detection base, detection upper cavity is provided in the detection upper cover, the detection upper cavity is cooperated with detection lower cavity for fixing injection molding sample;Pressure maintaining pipe, the pressure maintaining pipe is connected with detection upper cover, the pressure maintaining pipe is connected with pressure maintaining air pump, the pressure maintaining pipe is communicated with detection upper cavity;Gas chromatograph, the gas chromatograph is communicated with detection lower cavity.The utility model has the beneficial effects that: when detecting, two sealing devices are used, sealing effect is good, improve detection precision, improve use effect;The ejection mechanism is set, can improve injection molding sample to fetch time, improve test efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of injection molded part testing, and in particular to a sealing test device for injection molded samples. Background Technology

[0002] The gas generator of an automotive airbag consists of a generator housing, propellant, ignition device, and other components. The ignition device is manufactured using an injection molding process. To ensure a good seal after assembly, the injection-molded sample of the ignition device needs to undergo a sealing test.

[0003] Existing sealing testing devices are cumbersome to operate because once the injection-molded sample is placed inside the device, it is difficult to remove, resulting in low testing efficiency.

[0004] To improve testing efficiency, simplify operation, and enhance performance, the existing testing equipment needs structural optimization. Utility Model Content

[0005] This utility model aims to overcome the shortcomings of existing technologies, such as inconvenience and poor performance, and provides a shared electric vehicle controller structure that is simple to operate, convenient, and effective.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a sealing test device for injection molded samples, comprising: A detection base, wherein the detection base is provided with a lower detection cavity, and an ejection mechanism is installed in the lower detection cavity; The test cover is movable in a vertical direction and is installed on the upper end of the test base. A sealing ring is provided between the test cover and the test base. The test cover has an upper test cavity and a lower test cavity for fixing the injection molded sample. A pressure-holding tube is connected to the detection cover, a pressure-holding air pump is connected to the outside of the pressure-holding tube, and the pressure-holding tube is connected to the detection upper cavity; A gas phase analyzer, wherein the gas phase analyzer is connected to the lower detection chamber.

[0007] This testing device includes a testing base, a testing cover, and a gas phase analyzer. The testing base has a lower testing chamber, inside which an ejection mechanism is installed. This lower testing chamber is used to hold injection-molded samples. The testing cover matches the testing base, and a sealing ring is installed between them to ensure the airtightness of the testing equipment. The testing cover can move vertically and has a testing upper chamber inside. The matching of the upper and lower testing chambers forms a space for placing the injection-molded sample, and the testing cover can fix the injection-molded sample in place. The ejection mechanism can push the injection-molded sample outward after testing, facilitating the removal of the sample. Pressure-holding tubes are located at both ends of the testing cover, communicating with the testing upper chamber and connected to an external pressure-holding air pump. The gas phase analyzer is connected to the lower end of the testing base and communicates with the lower testing chamber. During the sealing test, the injection-molded sample is first placed into the lower testing chamber, and the upper testing cover and testing base are joined together to fix the sample in place. Sufficient downward pressure is maintained on the upper testing cover. Then, a pressure-holding air pump fills the upper testing chamber and the sample cavity with helium through a pressure-holding tube, ensuring the helium is under pressure. Next, a gas phase analyzer is activated, and the presence of helium is observed to assess whether the injection-molded sample leaks. This allows for the sealing test of the injection-molded sample. This testing device is easy to operate, provides good sealing performance, and is effective in use.

[0008] Preferably, the detection lower cavity includes an upper section and a lower section, which together form a sunken groove structure. An inner mounting groove is provided on the side wall of the upper section, and a sealing ring is installed within the inner mounting groove. Specifically, the detection lower cavity includes an upper section and a lower section, which together form a sunken groove structure. An inner mounting groove is provided on the side wall of the upper section, and a sealing ring is installed within this groove. This sealing ring can be fixed and sealed by an injection-molded sample. This structure ensures a good sealing effect of the pressure-holding cavity formed by the detection upper cavity and the injection-molded sample, thereby ensuring good detection results.

[0009] Preferably, the upper end of the testing base is provided with a clearance groove, the testing cover matches the clearance groove, the bottom surface of the clearance groove is provided with an upper mounting groove, and the sealing ring is installed in the upper mounting groove. The sealing ring is a hollow annular rubber ring. Specifically, the upper end of the testing base has a clearance groove, and the bottom surface of the clearance groove has an upper mounting groove. The sealing ring is installed in the upper mounting groove. When the testing cover is inserted into the clearance groove, the bottom surface of the testing cover can press the sealing ring tightly. The sealing ring has a hollow annular structure, and the sealing ring can be compressed by pressing down on the testing cover. This ensures that when the testing cover and the testing base are combined, the sealing ring can improve the sealing effect of the upper and lower testing cavities, thereby ensuring good sealing and testing effect of the injection molded sample and ensuring good performance.

[0010] Preferably, the ejection mechanism is located in the lower section of the lower cavity. The ejection mechanism is provided with an ejection spring and an ejection block. The ejection block has a U-shaped cross-section. The lower end of the ejection spring is connected to the bottom of the lower section of the lower cavity, and the upper end of the ejection spring is connected to the bottom surface of the ejection block. The upper end of the inner wall of the ejection block is provided with a chamfer. The ejection block is in contact with the injection molded sample. The ejection mechanism is installed in the lower section of the lower cavity. The ejection spring in the ejection mechanism contacts the bottom surface of the lower section of the lower cavity. The top of the ejection spring is connected to the ejection block, which has a U-shaped cross-section. When the injection molded sample is placed into the lower cavity for testing, the lower end of the injection molded sample is embedded in the groove structure of the ejection block, compressing the spring. This ensures that after the test is completed, the injection molded sample is ejected outward by the ejection spring and the ejection block, thus achieving simple and convenient operation. At the same time, the inner wall end of the ejection block is provided with a chamfer, which facilitates the insertion of the injection molded sample into the ejection block, making the placement of the injection molded sample during testing easier and improving the effectiveness of use.

[0011] Preferably, the bottom surface of the lower section of the lower cavity is provided with vent holes, and the bottom surface of the ejector block is provided with transition holes. Specifically, the bottom surface of the lower section of the lower cavity has several vent holes arranged at equal intervals, and the bottom surface of the ejector block also has several transition holes arranged at equal intervals. These vent holes and transition holes allow helium gas to pass through and enter the gas phase analyzer when there are sealing problems with the injection-molded sample during testing, ensuring accurate analysis and good sealing performance of the device.

[0012] Preferably, the detection cover has a T-shaped airflow channel inside, which communicates with the detection chamber. Both ends of the airflow channel are connected to pressure-holding tubes. Specifically, the T-shaped airflow channel inside the detection cover connects the horizontal end to the pressure-holding tube and the vertical end to the detection chamber. This structure facilitates the entry of helium gas and ensures good pressure holding, thereby guaranteeing the sealing detection effect of the device on the injection-molded sample.

[0013] Preferably, a limiting stage is provided inside the upper detection cavity to fix the injection-molded sample. Specifically, the limiting stage, which is a ring structure or composed of several block structures, allows the injection-molded sample to be placed in the lower detection cavity. After the upper detection cover is pressed down, the limiting stage fixes the injection-molded sample, ensuring its stable placement within the cavity formed by the upper and lower detection cavities. This, in turn, guarantees the sealing detection effect of the device on the injection-molded sample.

[0014] Preferably, a connecting plate is connected to the side wall of the detection base, and a push-pull clamp is connected to the top of the detection cover. The push-pull clamp can drive the detection cover to move vertically, and the push-pull clamp is connected to the upper end of the connecting plate. Specifically, the connecting plate is provided on the side wall of the detection base, and the push-pull clamp is connected above the connecting plate. The moving end of the push-pull clamp moves vertically, and the push-pull clamp is connected to the detection cover. By moving the push-pull clamp, the detection cover can be moved vertically, facilitating the placement of the injection-molded sample into the lower detection cavity. Simultaneously, the push-pull clamp can lock when the detection cover is pressed onto the detection base. This structure ensures a sealing effect during testing and improves the usability.

[0015] Preferably, the gas phase analyzer includes a vacuum chamber with an external vacuum pump. The vacuum chamber is positioned below the detection base and communicates with the lower detection chamber. The gas phase analyzer comprises an analyzer body and a vacuum chamber, which are connected. The analyzer body performs gas phase analysis on the gas within the vacuum chamber. Since the vacuum chamber is connected to the lower detection chamber, when helium gas enters the vacuum chamber from the lower detection chamber, the analyzer body can detect the helium's presence. This indicates poor sealing of the injection-molded sample. Conversely, if no helium gas is detected, the sample has good sealing. This principle allows for the determination of sealing performance, improving detection accuracy and usability.

[0016] The beneficial effects of this utility model are as follows: During testing, the injection-molded sample is placed in the lower testing chamber, and the push-pull clamps are pressed down to lock the relative position of the upper testing cover and the testing base, improving the sealing performance and operational efficiency, resulting in good usability; the use of a gas phase analyzer to detect whether the pressure-holding gas is leaking improves the testing accuracy and results in good testing performance; the use of a double sealing device during testing provides a good sealing effect, improving testing accuracy and usability; and the ejection mechanism reduces the time required to retrieve the injection-molded sample, increasing testing efficiency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional view of the present invention; Figure 2 This is a sectional view of the present invention; Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0018] In the attached diagram: 1. Detection base; 2. Detection top cover; 3. Pressure holding tube; 4. Gas phase analyzer; 5. Sealing ring; 6. Ejection spring; 7. Ejection block; 8. Connecting plate; 10. Lower detection chamber; 11. Upper section of lower chamber; 12. Lower section of lower chamber; 13. Inner mounting groove; 14. Sealing ring; 15. Relief groove; 16. Upper mounting groove; 17. Vent hole; 20. Upper detection chamber; 21. Airflow channel; 22. Limiting stage; 40. Vacuum chamber; 70. Relief chamfer; 71. Transition hole; 80. Push-pull clamp. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components illustrated in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0022] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0023] Example 1, such as Figure 1-3 As shown, a sealing test device for injection molded samples includes: a test base 1, wherein the test base 1 is provided with a lower test chamber 10, and an ejection mechanism is installed in the lower test chamber 10; a test upper cover 2, wherein the test upper cover 2 is movable in a vertical direction and is installed on the upper end of the test base 1, wherein a sealing ring 5 is provided between the test upper cover 2 and the test base 1, wherein a test upper chamber 20 is provided in the test upper cover 2, and the test upper chamber 20 cooperates with the lower test chamber 10 to fix the injection molded sample; a pressure holding tube 3, wherein the pressure holding tube 3 is connected to the test upper cover 2, and a pressure holding air pump is externally connected to the pressure holding tube 3, and the pressure holding tube 3 is connected to the test upper chamber 20; and a gas phase analyzer 4, wherein the gas phase analyzer 4 is connected to the lower test chamber 10.

[0024] The detection chamber 10 includes an upper section 11 and a lower section 12, which together form a sunken trough-shaped structure. The side wall of the upper section 11 is provided with an inner mounting groove 13, and a sealing ring 14 is installed in the inner mounting groove 13.

[0025] The upper end of the detection base 1 is provided with a clearance groove 15, the detection cover 2 is matched with the clearance groove 15, the bottom surface of the clearance groove 15 is provided with an upper mounting groove 16, the sealing ring 5 is installed in the upper mounting groove 16, and the sealing ring 5 is a hollow ring-shaped rubber ring.

[0026] The ejection mechanism is located in the lower section 12 of the lower cavity. The ejection mechanism is equipped with an ejection spring 6 and an ejection block 7. The ejection block 7 has a U-shaped cross-section. The lower end of the ejection spring 6 is connected to the bottom of the lower section 12 of the lower cavity, and the upper end of the ejection spring 6 is connected to the bottom surface of the ejection block 7. The upper end of the inner wall of the ejection block 7 is provided with a clearance chamfer 70. The ejection block 7 is in contact with the injection molded sample.

[0027] A vent hole 17 is provided on the bottom surface of the lower section 12 of the lower cavity, and a transition hole 71 is provided on the bottom surface of the ejector block 7.

[0028] The upper cover 2 of the detection chamber is provided with an airflow channel 21 with a cross section of T. The airflow channel 21 is connected to the upper cavity 20 of the detection chamber, and the two ends of the airflow channel 21 are respectively connected to the pressure holding tube 3.

[0029] A limiting stage 22 is provided inside the upper cavity 20 for fixing the injection molded sample.

[0030] The detection base 1 has a connecting plate 8 connected to its side wall, and the top of the detection cover 2 has a push-pull clamp 80 connected to it. The push-pull clamp 80 can drive the detection cover 2 to move vertically, and the push-pull clamp 80 is connected to the upper end of the connecting plate 8.

[0031] The gas phase analyzer 4 is equipped with a vacuum chamber 40, which is connected to a vacuum pump. The vacuum chamber 40 is located below the detection base 1 and is connected to the lower detection chamber 10.

[0032] The working principle of this utility model is as follows: Figure 1-3 As shown, this testing device includes a testing base 1, a testing cover 2, and a gas phase analyzer 4. The testing base 1 has a lower testing chamber 10, inside which an ejection mechanism is installed. This lower testing chamber 10 is used to place injection-molded samples. The testing cover 2 matches the testing base 1, and a sealing ring is provided between them to ensure the sealing of the testing equipment. The testing cover 2 can move vertically and has a testing upper chamber 20 inside. The testing upper chamber 20 and the testing lower chamber 10 match to form a space for placing the injection-molded sample, and the testing cover 2 can fix the injection-molded sample. The ejection mechanism can eject the injection-molded sample after testing, facilitating its removal. Pressure-holding pipes 3 are provided at both ends of the testing cover 2, and these pipes are connected to the testing upper chamber 20. An external pressure-holding air pump is connected to each pressure-holding pipe 3. The gas phase analyzer 4 is connected to the lower end of the testing base 1, and it is also connected to the lower testing chamber 10. During the sealing test, the injection-molded sample is first placed into the lower testing chamber 10, and the upper testing cover 2 and the testing base 1 are joined together to fix the injection-molded sample in the lower testing chamber 10, maintaining sufficient downward pressure on the upper testing cover 2. Then, a pressure-holding air pump fills the upper testing chamber 20 with helium through the pressure-holding pipe 3, ensuring that the upper testing chamber 20 and the cavity of the injection-molded sample are filled with helium and that the helium in the cavity is kept under pressure. Next, the gas phase analyzer 4 is activated, and the presence of helium in the gas phase analyzer 4 is observed to assess whether the injection-molded sample leaks, thus enabling a sealing test of the injection-molded sample. This testing device is easy to operate, provides good sealing performance, and is effective in use.

[0033] The lower chamber 10 includes an upper section 11 and a lower section 12, which together form a sunken trough-shaped structure. An inner mounting groove 13 is provided on the side wall of the upper section 11, and a sealing ring 14 is installed in the inner mounting groove 13. The sealing ring 14 can be fixed and sealed by injection molding of the sample. This structure can ensure a good sealing effect of the pressure-holding cavity formed by the upper chamber 20 and the injection molding sample, thereby ensuring a good detection effect.

[0034] The upper end of the testing base 1 is provided with a clearance groove 15, and the bottom surface of the clearance groove 15 is provided with an upper mounting groove 16. The sealing ring is installed in the upper mounting groove 16. When the testing cover 2 is inserted into the clearance groove 15, the bottom surface of the testing cover 2 can press the sealing ring tightly. The sealing ring is a hollow ring structure. By pressing down on the testing cover 2, the sealing ring can be compressed, ensuring that when the testing cover 2 and the testing base 1 are combined, the sealing ring can improve the sealing effect of the upper testing cavity 20 and the lower testing cavity 10, thereby ensuring a good sealing test effect for the injection molded sample and ensuring good use effect.

[0035] The ejection mechanism is installed in the lower section 12 of the lower cavity. The ejection spring 6 in the ejection mechanism is in contact with the bottom surface of the lower section 12. The top of the ejection spring 6 is connected to the ejection block 7, which has a U-shaped cross-section. When the injection molded sample is placed into the lower cavity 10 for testing, the lower end of the injection molded sample is embedded in the groove structure of the ejection block 7, and the spring is compressed. This ensures that after the test is completed, the injection molded sample is ejected outward by the ejection spring 6 and the ejection block 7, thus achieving simple and convenient operation. At the same time, the inner wall end of the ejection block 7 is provided with a chamfer. This structure can facilitate the injection molded sample to be inserted into the ejection block 7, which facilitates the placement of the injection molded sample during testing and improves the use effect.

[0036] The lower section 12 of the lower cavity has several vent holes 17 arranged at equal intervals on its bottom surface, and the ejector block 7 has several transition holes 71 arranged at equal intervals on its bottom surface. The vent holes 17 and transition holes 71 allow helium gas to pass through and enter the gas phase analyzer 4 when there is a sealing problem in the injection molded sample during testing, ensuring accurate analysis and good sealing test performance of the device.

[0037] An airflow channel 21 is provided inside the detection cover 2. The airflow channel 21 is T-shaped. The horizontal end of the airflow channel 21 is used to connect to the pressure-holding gas pipe, and the vertical end is connected to the detection upper cavity 20. The structure of the airflow channel 21 can facilitate the inflow of helium gas and make the pressure-holding effect good, thereby ensuring the sealing detection effect of the device on the injection molded sample.

[0038] The upper detection chamber 20 is equipped with a limiting platform 22, which is a ring structure or composed of several block structures. The limiting platform 22 can fix the injection molded sample after it is placed in the lower detection chamber 10 and the upper detection cover 2 is pressed down. This ensures that the injection molded sample is stably placed in the cavity formed by the upper detection chamber 20 and the lower detection chamber 10, thereby ensuring the sealing detection effect of the device on the injection molded sample.

[0039] The test base 1 has a connecting plate 8 on its side wall. A push-pull clamp 80 is connected above the connecting plate 8. The moving end of the push-pull clamp 80 moves vertically. The push-pull clamp 80 is connected to the test cover 2. By moving the push-pull clamp 80, the test cover 2 can be moved vertically, which facilitates the placement of the injection molded sample into the test lower cavity 10. At the same time, the push-pull clamp 80 can lock when the test cover 2 is pressed onto the test base 1. This structure can ensure the sealing effect during the test and improve the use effect.

[0040] The gas phase analyzer 4 includes an analyzer body and a vacuum chamber 40, which are connected. The analyzer body can perform gas phase analysis on the gas in the vacuum chamber 40. The vacuum chamber 40 is connected to the detection lower chamber 10. When helium gas enters the vacuum chamber 40 from the detection lower chamber 10, the analyzer body can detect the helium gas entering the vacuum chamber 40. At this time, it can be concluded that the sealing effect of the injection molded sample is poor. When the analysis structure does not detect helium gas, it can be concluded that the sealing performance of the injection molded sample is good. The quality of sealing performance can be determined through this principle. This structure can improve the detection accuracy and the effect of use.

[0041] In Example 2, the push-pull clamp 80 installed on the connecting plate 8 can be replaced by a telescopic cylinder. The telescopic end of the telescopic cylinder is connected to the test cover. By pushing out the telescopic cylinder, the cover of the test is pressed against the test base, ensuring the test effect of the sealing test device.

[0042] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A sealing test device for injection molded samples, characterized in that, include: The detection base (1) is provided with a detection lower cavity (10), and an ejection mechanism is installed in the detection lower cavity (10); The test cover (2) is movable in the vertical direction. The test cover (2) is installed on the upper end of the test base (1). A sealing ring (5) is provided between the test cover (2) and the test base (1). The test cover (2) is provided with a test upper cavity (20). The test upper cavity (20) and the test lower cavity (10) cooperate to fix the injection molded sample. Pressure holding tube (3), the pressure holding tube (3) is connected to the detection cover (2), the pressure holding tube (3) is connected to an external pressure holding air pump, and the pressure holding tube (3) is connected to the detection upper cavity (20); Gas phase analyzer (4), which is connected to the detection chamber (10).

2. The sealing test device for injection molded samples according to claim 1, characterized in that, The detection chamber (10) includes an upper section (11) and a lower section (12) that form a sunken trough structure. An inner mounting groove (13) is provided on the side wall of the upper section (11), and a sealing ring (14) is installed in the inner mounting groove (13).

3. The sealing test device for injection molded samples according to claim 1, characterized in that, The upper end of the detection base (1) is provided with a relief groove (15), the detection cover (2) matches the relief groove (15), the bottom surface of the relief groove (15) is provided with an upper mounting groove (16), the sealing ring (5) is installed in the upper mounting groove (16), and the sealing ring (5) is a hollow ring-shaped rubber ring.

4. The sealing test device for injection molded samples according to claim 2, characterized in that, The ejection mechanism is placed in the lower section (12) of the lower cavity. The ejection mechanism is provided with an ejection spring (6) and an ejection block (7). The ejection block (7) has a U-shaped cross-section. The lower end of the ejection spring (6) is connected to the bottom of the lower section (12) of the lower cavity. The upper end of the ejection spring (6) is connected to the bottom surface of the ejection block (7). The upper end of the inner wall of the ejection block (7) is provided with a chamfer (70). The ejection block (7) is in contact with the injection molded sample.

5. The sealing test device for injection molded samples according to claim 4, characterized in that, The bottom surface of the lower section (12) of the lower cavity is provided with a vent (17), and the bottom surface of the ejector block (7) is provided with a transition hole (71).

6. The sealing test device for injection molded samples according to claim 1, characterized in that, The detection cover (2) is provided with a T-shaped airflow channel (21), which is connected to the detection chamber (20). Both ends of the airflow channel (21) are connected to the pressure holding tube (3).

7. The sealing test device for injection molded samples according to claim 1, characterized in that, The upper cavity (20) of the test chamber is provided with a limiting stage (22), which is used to fix the injection molded sample.

8. The sealing test device for injection molded samples according to claim 1, characterized in that, The detection base (1) has a connecting plate (8) connected to its side wall, and the top of the detection cover (2) has a push-pull clamp (80) connected to its top. The push-pull clamp (80) can drive the detection cover (2) to move vertically. The push-pull clamp (80) is connected to the upper end of the connecting plate (8).

9. The sealing test device for injection molded samples according to claim 1, characterized in that, The gas phase analyzer (4) is provided with a vacuum chamber (40), and a vacuum pump is connected to the vacuum chamber (40). The vacuum chamber (40) is located below the detection base (1) and is connected to the detection lower chamber (10).

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