Novel gas protection structure of small punch testing machine

Abstract

The invention provides a novel gas protection structure of a small punch testing machine, which relates to the technical field of small punch testing and comprises an installation heat preservation unit, a sealing shielding unit, a gas conveying unit and a conveying detection unit. The sealing shielding unit is installed on the top of the installation heat preservation unit. The number of the gas conveying units is four, and the four gas conveying units are installed on the installation heat preservation unit. The conveying detection unit is mounted on the mounting heat preservation unit and the gas conveying units, and the conveying detection unit is used for conveying inert gas and detecting whether the four groups of gas conveying units are reset or not; when the output shaft on the testing machine is separated from the two corresponding supporting balls, the sealing shielding cover can automatically reset under the action of the two spiral springs a, and automatic sealing of the circular quartz tube is achieved; the problem that dust easily enters a gas protection structure when a test is not carried out due to lack of an automatic sealing structure is solved.

Description

Technical Field

[0001] This invention belongs to the field of small punch testing technology, and more specifically, relates to a novel gas protection structure for a small punch testing machine. Background Technology

[0002] As a core micro-testing technique for evaluating the mechanical properties of materials, the small punch test plays an irreplaceable role in the testing of rare materials, the evaluation of local performance of components, and the research of materials under special environments such as high temperature and corrosion. Since the sample is easily oxidized and corroded by contact with air during the test, which leads to deviations in the test data, it is necessary to introduce a protective gas to isolate the air and ensure the stability of the test environment.

[0003] The current gas protection structure still has the following problems: 1. It lacks an automatic sealing structure, which makes it easy for dust to enter the gas protection structure when no test is being conducted; 2. It cannot guide the inert gas, which prevents the sample in the test mold from quickly contacting the inert gas, affecting the experimental efficiency; 3. When the test mold is replaced, if the pipeline for delivering the inert gas is not accurately reset, it cannot promptly notify the staff. Summary of the Invention

[0004] This disclosure relates to a novel gas protection structure for a small punch testing machine, comprising an insulation unit, a sealing and shielding unit, a gas delivery unit, and a delivery and detection unit. When the output shaft on the testing machine separates from the corresponding two support balls, the sealing and shielding cover automatically resets under the action of two helical springs a, achieving automatic sealing of the circular quartz tube. The movable telescopic tube guides the inert gas in the L-shaped delivery tube a, allowing the inert gas to directly contact the sample. When the inert gas in the semi-circular delivery hood cannot be discharged, the pressure sensor detects the pressure information and transmits it to the external control module and the prompting module, which helps to prompt the operator to reset the four movable telescopic tubes in a timely manner. This solves the problems of dust easily entering the gas protection structure when no test is being conducted, the sample in the test mold not being able to quickly contact the inert gas, and the inability to promptly prompt the operator when the pipeline for delivering the inert gas is not accurately reset.

[0005] This invention provides a novel gas protection structure for a small punch testing machine, comprising: a mounting and insulation unit, a sealing and shielding unit, a gas delivery unit, and a delivery and detection unit; the sealing and shielding unit is installed on top of the mounting and insulation unit, and is used to automatically seal the top of the mounting and insulation unit when no test is being conducted; the gas delivery unit comprises four sets, and the four sets of gas delivery units are installed on the mounting and insulation unit, and the gas delivery unit is used to guide inert gas into contact with the test sample; the delivery and detection unit is installed on the mounting and insulation unit and the gas delivery unit, and the delivery and detection unit is used to deliver inert gas, and also to detect whether the four sets of gas delivery units have been reset.

[0006] In at least some embodiments, the installation insulation unit includes: a testing machine connecting seat and a circular quartz tube; the testing machine connecting seat has two rings of mounting holes, the lower ring of mounting holes is used to connect the testing machine connecting seat to the testing machine, and the upper ring of mounting holes is used to install the testing fixture; the circular quartz tube is fixedly installed on the testing machine connecting seat.

[0007] In at least some embodiments, the installation insulation unit further includes: a positioning magnet a and a circular insulation cover; there are four positioning magnets a in total, and the four positioning magnets a are fixedly installed on the inner wall of the circular quartz tube; the circular insulation cover is fixedly installed on the outer wall of the circular quartz tube.

[0008] In at least some embodiments, the sealing and shielding unit includes: a circular mounting block, a circular positioning ring, and a sealing and shielding cover; the circular mounting block is fixedly mounted on the top of the circular insulation cover; the circular positioning ring is fixedly mounted on the top of the circular mounting block; the sealing and shielding cover is rotatably mounted on the outside of the circular mounting block, and the sealing and shielding cover is located between the circular insulation cover and the circular positioning ring.

[0009] In at least some embodiments, the sealing and shielding unit further includes: supporting balls and positioning supports; there are four supporting balls in total, and the four supporting balls are rotatably mounted on the sealing and shielding cover; the positioning supports are fixedly mounted on the top of the circular heat insulation cover.

[0010] In at least some embodiments, the sealing and shielding unit further includes: a circular reset ring and a helical spring a; the circular reset ring is fixedly installed on the positioning support, and the circular reset ring is also slidably connected to the sealing and shielding cover; there are two helical springs a, and the two helical springs a are sleeved on the outside of the circular reset ring, and the two helical springs a are located between the sealing and shielding cover and the positioning support.

[0011] In at least some embodiments, the gas delivery unit includes: an L-shaped delivery pipe a, a movable telescopic pipe, and a circular limiting frame a; the L-shaped delivery pipe a is fixedly installed on the testing machine connecting seat; the movable telescopic pipe is slidably installed on the L-shaped delivery pipe a, and a ring of circular delivery holes a is opened on the movable telescopic pipe, and the ring of circular delivery holes a is located in the L-shaped delivery pipe a; the circular limiting frame a is fixedly installed on the outside of the movable telescopic pipe.

[0012] In at least some embodiments, the gas delivery unit further includes: a circular limiting frame b, a helical spring b, and a positioning magnet b; the circular limiting frame b is fixedly installed on the outside of the movable telescopic tube; the helical spring b is sleeved on the outside of the movable telescopic tube, and the helical spring b is located between the L-shaped delivery tube a and the circular limiting frame a; the positioning magnet b is fixedly installed on the outside of the movable telescopic tube, and the positioning magnet b is concentrically arranged with the positioning magnet a.

[0013] In at least some embodiments, the conveying detection unit includes: a semi-circular conveying cover, a pressure sensor, and an L-shaped conveying pipe b; the semi-circular conveying cover is fixedly installed outside the testing machine connecting seat, and a gas cylinder connector is provided on the semi-circular conveying cover, and the bottom end of the L-shaped conveying pipe b is connected to the semi-circular conveying cover; the pressure sensor is fixedly installed on the semi-circular conveying cover; the L-shaped conveying pipe b is fixedly installed on the testing machine connecting seat, and the bottom end of the L-shaped conveying pipe b is connected to the semi-circular conveying cover.

[0014] In at least some embodiments, the conveying detection unit further includes: a movable control plate and an irregularly shaped connecting frame; the movable control plate is slidably mounted on the L-shaped conveying pipe b, and a circular conveying hole b is provided on the movable control plate; the top end of the irregularly shaped connecting frame is fixedly connected to the circular limiting frame b, and the bottom end of the irregularly shaped connecting frame is fixedly connected to the movable control plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The circular heat insulation cover of this invention provides a good heat insulation effect; the sealed cover seals the top of the circular quartz tube and provides a dustproof effect when no test is being conducted. In addition, two of the support balls can contact the outer wall of the output shaft on the testing machine to avoid excessive wear of the sealing cover; when the output shaft on the testing machine separates from the corresponding two support balls, the sealing cover can automatically reset under the action of two helical springs a, realizing the automatic sealing of the circular quartz tube.

[0016] 2. The L-shaped delivery pipe a of the present invention plays a role in transporting inert gas; the movable telescopic pipe plays a role in guiding the inert gas in the L-shaped delivery pipe a, so that the inert gas can directly contact the sample. In addition, the helical spring b provides elastic positioning for the movable telescopic tube, ensuring that the movable telescopic tube remains in a stable state. When the test mold needs to be replaced, the staff pulls the movable telescopic tube outward to make the positioning magnet a contact with the positioning magnet b. This ensures that the inert gas is guided without hindering the removal and installation of the test mold.

[0017] 3. The L-shaped conveying pipe b of this invention allows inert gas to enter the circular quartz tube through the L-shaped conveying pipe b, so that the entire interior of the circular quartz tube is also in an inert gas state; when the operator pulls the four movable telescopic pipes outward, the irregular connecting frame will also drive the movable control plate to move simultaneously. In addition, when the staff pulls the four movable telescopic tubes outward, the four circular conveying holes a move out of the four L-shaped conveying tubes a, and the circular conveying hole b moves out of the L-shaped conveying tube b, preventing the inert gas in the semi-circular conveying hood from escaping. When the inert gas in the semi-circular conveying hood cannot be expelled, the pressure sensor can detect the pressure information and transmit the pressure information to the external control module and the prompting module, which helps to prompt the staff to reset the four movable telescopic tubes in a timely manner. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0019] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0020] In the attached diagram: Figure 1 A three-dimensional structural schematic diagram of the present invention is shown; Figure 2 This diagram shows a partial cross-sectional view of the insulation unit installed according to the present invention. Figure 3 A schematic diagram of the sealing and shielding unit of the present invention is shown; Figure 4 The present invention is shown. Figure 1 A schematic diagram of the central cross-section structure; Figure 5 The present invention is shown. Figure 4 A magnified schematic diagram of a portion of region A in the middle; Figure 6 A schematic diagram of the structure of the test machine connection base and four gas delivery units of the present invention is shown; Figure 7 The present invention is shown. Figure 6 A magnified schematic diagram of a portion of region B in the middle; Figure 8 The present invention is shown. Figure 4 A magnified schematic diagram of a portion of region C in the middle; Figure 9 A schematic diagram of the structure of the testing machine connecting seat and the conveying and testing unit of the present invention is shown; Figure 10 The present invention is shown. Figure 9 A magnified schematic diagram of the structure of region D in the middle.

[0021] List of reference numerals in the attached diagram: 100. Installation of insulation unit; 101. Testing machine connection seat; 102. Circular quartz tube; 103. Positioning magnet a; 104. Circular insulation cover; 200. Sealing and shielding unit; 201. Circular mounting block; 202. Circular positioning ring; 203. Sealing and shielding cover; 204. Support ball; 205. Positioning support; 206. Circular reset ring; 207. Helical spring a; 300. Gas delivery unit; 301. L-shaped delivery pipe a; 302. Movable telescopic pipe; 3021. Circular delivery hole a; 303. Circular limiting frame a; 304. Circular limiting frame b; 305. Helical spring b; 306. Positioning magnet b; 400. Conveying and detection unit; 401. Semi-circular conveying cover; 4011. Gas cylinder connector; 402. Pressure sensor; 403. L-shaped conveying pipe b; 404. Movable control board; 4041. Circular conveying hole b; 405. Irregular connecting frame. Detailed Implementation

[0022] To make the objectives, solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Unless otherwise stated, the terms used herein have their ordinary meanings in the art. The same reference numerals in the drawings represent the same parts.

[0023] Example: Please refer to Figures 1 to 10 As shown: This invention provides a novel gas protection structure for a small punch testing machine, comprising: a mounting insulation unit 100, a sealing and shielding unit 200, a gas delivery unit 300, and a delivery and detection unit 400; the sealing and shielding unit 200 is installed on top of the mounting insulation unit 100, and is used to automatically seal the top of the mounting insulation unit 100 when no test is being performed; four sets of gas delivery units 300 are provided, and the four sets of gas delivery units 300 are installed on the mounting insulation unit 100, and are used to guide inert gas into contact with the test sample; the delivery and detection unit 400 is installed on the mounting insulation unit 100 and the gas delivery units 300, and is used to deliver inert gas, and is also used to detect whether the four sets of gas delivery units 300 have been reset.

[0024] In this embodiment of the disclosure, such as Figure 2 , Figure 3 and Figure 5 As shown, the installation insulation unit 100 includes: a testing machine connecting seat 101 and a circular quartz tube 102; the testing machine connecting seat 101 has two rings of mounting holes, the lower ring of mounting holes is used to connect the testing machine connecting seat 101 to the testing machine, and the upper ring of mounting holes is used to install the testing fixture; the circular quartz tube 102 is fixedly installed on the testing machine connecting seat 101; the installation insulation unit 100 also includes: positioning magnets a103 and a circular insulation cover 104; there are four positioning magnets a103, and the four positioning magnets a103 are fixedly installed on the inner wall of the circular quartz tube 102; the circular insulation cover 104 is fixedly installed on the outer wall of the circular quartz tube 102.

[0025] The sealing and shielding unit 200 includes: a circular mounting block 201, a circular positioning ring 202, and a sealing and shielding cover 203; the circular mounting block 201 is fixedly mounted on the top of the circular insulation cover 104; the circular positioning ring 202 is fixedly mounted on the top of the circular mounting block 201; the sealing and shielding cover 203 is rotatably mounted on the outside of the circular mounting block 201, and the sealing and shielding cover 203 is located between the circular insulation cover 104 and the circular positioning ring 202; the sealing and shielding unit 200 also includes: supporting balls 204 and positioning supports 205; there are four supporting balls 204 in total, and the four supporting balls 204 are positioned in a manner that is consistent with the overall structure of the circular insulation cover 104 and the circular positioning ring 202. The bead 204 is rotatably mounted on the sealing cover 203; the positioning support 205 is fixedly mounted on the top of the circular insulation cover 104; the sealing unit 200 also includes: a circular reset ring 206 and a helical spring a207; the circular reset ring 206 is fixedly mounted on the positioning support 205, and the circular reset ring 206 is also slidably connected to the sealing cover 203; there are two helical springs a207, and the two helical springs a207 are sleeved on the outside of the circular reset ring 206, and the two helical springs a207 are located between the sealing cover 203 and the positioning support 205.

[0026] Its specific functions are as follows: Since the circular quartz tube 102 is fixedly installed on the testing machine connecting seat 101, and the circular heat insulation cover 104 is fixedly installed on the outer wall of the circular quartz tube 102, it has a good heat insulation effect; since the circular positioning ring 202 is fixedly installed on the top of the circular mounting block 201, and the sealing cover 203 is rotatably installed on the outside of the circular mounting block 201, and the sealing cover 203 is located between the circular heat insulation cover 104 and the circular positioning ring 202, it has a sealing effect on the top of the circular quartz tube 102, and has a sealing and dustproof effect when no test is being conducted.

[0027] Furthermore, because the four support balls 204 are rotatably mounted on the sealing cover 203, two of the support balls 204 can contact the outer wall of the output shaft on the testing machine, thus preventing excessive wear of the sealing cover 203. Also, because the circular reset ring 206 is fixedly mounted on the positioning support 205, and the circular reset ring 206 is also slidably connected to the sealing cover 203, and the two helical springs a207 are located between the sealing cover 203 and the positioning support 205, when the output shaft on the testing machine separates from the corresponding two support balls 204, the sealing cover 203 can automatically reset under the action of the two helical springs a207, thus realizing the automatic sealing of the circular quartz tube 102.

[0028] In this embodiment of the disclosure, such as Figures 6 to 8 As shown, the gas delivery unit 300 includes: an L-shaped delivery pipe a301, a movable telescopic pipe 302, and a circular limiting frame a303; the L-shaped delivery pipe a301 is fixedly installed on the testing machine connecting seat 101; the movable telescopic pipe 302 is slidably installed on the L-shaped delivery pipe a301, and a ring of circular delivery holes a3021 is opened on the movable telescopic pipe 302, and the ring of circular delivery holes a3021 is located in the L-shaped delivery pipe a301; the circular limiting frame a303 is fixedly installed on the outside of the movable telescopic pipe 302. The gas delivery unit 300 also includes: a circular limiting frame b304, a helical spring b305, and a positioning magnet b306; the circular limiting frame b304 is fixedly installed on the outside of the movable telescopic tube 302; the helical spring b305 is sleeved on the outside of the movable telescopic tube 302, and the helical spring b305 is located between the L-shaped delivery tube a301 and the circular limiting frame a303; the positioning magnet b306 is fixedly installed on the outside of the movable telescopic tube 302, and the positioning magnet b306 is concentrically arranged with the positioning magnet a103.

[0029] Its specific function is as follows: Since the L-shaped conveying pipe a301 is fixedly installed on the testing machine connecting seat 101, it plays a role in conveying the inert gas; and since the movable telescopic pipe 302 is slidably installed on the L-shaped conveying pipe a301, and a ring of circular conveying holes a3021 is opened on the movable telescopic pipe 302, and the ring of circular conveying holes a3021 is located in the L-shaped conveying pipe a301, it plays a guiding role in the inert gas in the L-shaped conveying pipe a301, so that the inert gas can directly contact the sample.

[0030] Furthermore, because the helical spring b305 is sleeved on the outside of the movable telescopic tube 302 and is located between the L-shaped conveying pipe a301 and the circular limiting frame a303, it plays an elastic positioning role for the movable telescopic tube 302, ensuring that the movable telescopic tube 302 can be in a stable state. Also, because the positioning magnet b306 is fixedly installed on the outside of the movable telescopic tube 302, and the positioning magnet b306 is concentrically set with the positioning magnet a103, and the magnetic force between the positioning magnet a103 and the positioning magnet b306 is greater than the elastic force of the helical spring b305, when the test mold needs to be replaced, the operator pulls the movable telescopic tube 302 outward to make the positioning magnet a103 contact the positioning magnet b306. Under the premise of ensuring the guidance of inert gas, the removal and installation of the test mold are not hindered.

[0031] In this embodiment of the disclosure, such as Figure 4 , Figure 9 and Figure 10 As shown, the conveying and detection unit 400 includes: a semi-circular conveying cover 401, a pressure sensor 402, and an L-shaped conveying pipe b403; the semi-circular conveying cover 401 is fixedly installed on the outside of the testing machine connecting base 101, and a gas cylinder connector 4011 is provided on the semi-circular conveying cover 401, and the bottom end of the L-shaped conveying pipe b301 is connected to the semi-circular conveying cover 401; the pressure sensor 402 is fixedly installed on the semi-circular conveying cover 401; the L-shaped conveying pipe b403 is fixedly installed on the testing machine connecting base. On 101, the bottom end of the L-shaped conveying pipe b403 is connected to the semi-circular conveying cover 401; the conveying detection unit 400 also includes: a movable control plate 404 and an irregular connecting frame 405; the movable control plate 404 is slidably installed on the L-shaped conveying pipe b403, and a circular conveying hole b4041 is opened on the movable control plate 404; the top end of the irregular connecting frame 405 is fixedly connected to the circular limiting frame b304, and the bottom end of the irregular connecting frame 405 is fixedly connected to the movable control plate 404.

[0032] Its specific function is as follows: Since the L-shaped conveying pipe b403 is fixedly installed on the testing machine connecting seat 101, and the bottom end of the L-shaped conveying pipe b403 is connected to the semi-circular conveying cover 401, inert gas can also enter the circular quartz tube 102 through the L-shaped conveying pipe b403, so that the entire interior of the circular quartz tube 102 is also in an inert gas state; since the movable control plate 404 is slidably installed on the L-shaped conveying pipe b403, and the top end of the irregular connecting frame 405 is fixedly connected to the circular limiting frame b304, and the bottom end of the irregular connecting frame 405 is fixedly connected to the movable control plate 404, when the operator pulls the four movable telescopic pipes 302 outward, the irregular connecting frame 405 will also drive the movable control plate 404 to move simultaneously; that is, the end of the L-shaped conveying pipe b403 is provided with a through hole that penetrates the L-shaped conveying pipe b403 radially, and the movable control plate 404 can be slidably installed in the through hole.

[0033] Furthermore, because the movable telescopic tube 302 has a circular conveying hole a3021 and the movable control plate 404 has a circular conveying hole b4041, when the operator pulls the four movable telescopic tubes 302 outward, the four circular conveying holes a3021 move out of the four L-shaped conveying tubes a301, and the circular conveying hole b4041 moves out of the L-shaped conveying tube b403, preventing the inert gas in the semi-circular conveying cover 401 from escaping. Also, because the pressure sensor 402 is fixedly installed on the semi-circular conveying cover 401 and is connected to the external circuit, when the inert gas in the semi-circular conveying cover 401 cannot be expelled, the pressure sensor 402 can detect the pressure information and transmit the pressure information to the external control module and the prompting module, which helps to prompt the operator to reset the four movable telescopic tubes 302 in a timely manner.

[0034] The specific usage and function of this embodiment are as follows: In use of this invention, the operator first connects the testing machine connecting seat 101 to the small punch testing machine using a ring of screws, then installs the experimental mold onto the testing machine connecting seat 101 using another ring of screws. Next, the pressure sensor 402 is connected to the external wiring, and then the gas cylinder connector 4011 is connected to the pipe on the gas cylinder. During the experiment, the operator rotates the sealing cover 203, then inserts the output shaft of the small punch testing machine into the circular quartz tube 102, and then loosens the sealing cover 203, allowing the corresponding two support balls 204 to connect to the output shaft of the small punch testing machine, avoiding... Excessive wear occurs to the sealing cover 203; when the output shaft on the testing machine separates from the corresponding two support balls 204, the sealing cover 203 automatically resets under the action of two helical springs a207, achieving automatic sealing of the circular quartz tube 102; the four L-shaped conveying pipes a301 are used to convey the inert gas; the four movable telescopic pipes 302 guide the inert gas in the four L-shaped conveying pipes a301, allowing the inert gas to directly contact the sample; the four helical springs b305 provide support for the four movable telescopic pipes 302. The elastic positioning function ensures that the four movable telescopic tubes 302 remain stable. When the test mold needs to be replaced, the operator pulls the four movable telescopic tubes 302 outward, causing the four positioning magnets a103 to contact the four positioning magnets b306. This ensures that the inert gas is guided without hindering the removal and installation of the test mold. The inert gas can also enter the circular quartz tube 102 through the L-shaped delivery pipe b403, so that the entire interior of the circular quartz tube 102 is also in an inert gas state. When the operator pulls the four movable telescopic tubes 302 outward, the irregular connecting frame 40... 5 will also cause the active control plate 404 to move simultaneously; when the staff pulls the four movable telescopic tubes 302 outward, the four circular conveying holes a3021 move out of the four L-shaped conveying tubes a301, and the circular conveying hole b4041 moves out of the L-shaped conveying tube b403, so that the inert gas in the semi-circular conveying cover 401 cannot be discharged; when the inert gas in the semi-circular conveying cover 401 cannot be discharged, the pressure sensor 402 can detect the pressure information and transmit the pressure information to the external control module and the prompting module, which helps to prompt the staff to reset the four movable telescopic tubes 302 in time.

[0035] The following points should be noted in this article: 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0036] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0037] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A novel gas protection structure for a small punch testing machine, comprising: The system comprises an insulation unit (100), a sealing and shielding unit (200), a gas delivery unit (300), and a delivery detection unit (400); characterized in that the sealing and shielding unit (200) is installed on the top of the insulation unit (100), and the sealing and shielding unit (200) is used to automatically seal the top of the insulation unit (100) when no test is being conducted; the gas delivery unit (300) is provided in four sets, and the four sets of gas delivery units (300) are installed on the insulation unit (100), and the gas delivery unit (300) is used to guide inert gas to contact the test sample; the delivery detection unit (400) is installed on the insulation unit (100) and the gas delivery unit (300), and the delivery detection unit (400) is used to deliver inert gas, and the delivery detection unit (400) is also used to detect whether the four sets of gas delivery units (300) have been reset.

2. The novel gas protection structure for a small punch testing machine according to claim 1, characterized in that, The installation insulation unit (100) includes: a testing machine connecting seat (101) and a circular quartz tube (102); the testing machine connecting seat (101) has two rings of mounting holes, the lower ring of mounting holes is used to connect the testing machine connecting seat (101) to the testing machine, and the upper ring of mounting holes is used to install the testing fixture; the circular quartz tube (102) is fixedly installed on the testing machine connecting seat (101).

3. The novel gas protection structure for a small punch testing machine according to claim 2, characterized in that, The installation insulation unit (100) further includes: a positioning magnet a (103) and a circular insulation cover (104); there are four positioning magnets a (103), and the four positioning magnets a (103) are fixedly installed on the inner wall of the circular quartz tube (102); the circular insulation cover (104) is fixedly installed on the outer wall of the circular quartz tube (102).

4. The novel gas protection structure for a small punch testing machine according to claim 3, characterized in that, The sealing and shielding unit (200) includes: a circular mounting block (201), a circular positioning ring (202), and a sealing and shielding cover (203); the circular mounting block (201) is fixedly mounted on the top of the circular heat insulation cover (104); the circular positioning ring (202) is fixedly mounted on the top of the circular mounting block (201); the sealing and shielding cover (203) is rotatably mounted on the outside of the circular mounting block (201), and the sealing and shielding cover (203) is located between the circular heat insulation cover (104) and the circular positioning ring (202).

5. The novel gas protection structure for a small punch testing machine according to claim 4, characterized in that, The sealing and shielding unit (200) further includes: support balls (204) and positioning supports (205); there are four support balls (204), and the four support balls (204) are rotatably mounted on the sealing and shielding cover (203); the positioning supports (205) are fixedly mounted on the top of the circular heat insulation cover (104).

6. The novel gas protection structure for a small punch testing machine according to claim 5, characterized in that, The sealing and shielding unit (200) further includes: a circular reset ring (206) and a helical spring a (207); the circular reset ring (206) is fixedly installed on the positioning support (205), and the circular reset ring (206) is also slidably connected to the sealing and shielding cover (203); there are two helical springs a (207), and the two helical springs a (207) are sleeved on the outside of the circular reset ring (206), and the two helical springs a (207) are located between the sealing and shielding cover (203) and the positioning support (205).

7. The novel gas protection structure for a small punch testing machine according to claim 3, characterized in that, The gas delivery unit (300) includes: an L-shaped delivery pipe a (301), a movable telescopic pipe (302), and a circular limiting frame a (303); the L-shaped delivery pipe a (301) is fixedly installed on the testing machine connecting seat (101); the movable telescopic pipe (302) is slidably installed on the L-shaped delivery pipe a (301), and a circular delivery hole a (3021) is opened on the movable telescopic pipe (302), and the circular delivery hole a (3021) is located in the L-shaped delivery pipe a (301); the circular limiting frame a (303) is fixedly installed on the outside of the movable telescopic pipe (302).

8. The novel gas protection structure for a small punch testing machine according to claim 7, characterized in that, The gas delivery unit (300) further includes: a circular limiting frame b (304), a helical spring b (305), and a positioning magnet b (306); the circular limiting frame b (304) is fixedly installed on the outside of the movable telescopic tube (302); the helical spring b (305) is sleeved on the outside of the movable telescopic tube (302), and the helical spring b (305) is located between the L-shaped delivery tube a (301) and the circular limiting frame a (303); the positioning magnet b (306) is fixedly installed on the outside of the movable telescopic tube (302), and the positioning magnet b (306) is concentrically arranged with the positioning magnet a (103).

9. A novel gas protection structure for a small punch testing machine according to claim 8, characterized in that, The conveying detection unit (400) includes: a semi-circular conveying cover (401), a pressure sensor (402), and an L-shaped conveying pipe b (403); the semi-circular conveying cover (401) is fixedly installed outside the testing machine connecting seat (101), and a gas cylinder connector (4011) is provided on the semi-circular conveying cover (401), and the bottom end of the L-shaped conveying pipe a (301) is connected to the semi-circular conveying cover (401); the pressure sensor (402) is fixedly installed on the semi-circular conveying cover (401); the L-shaped conveying pipe b (403) is fixedly installed on the testing machine connecting seat (101), and the bottom end of the L-shaped conveying pipe b (403) is connected to the semi-circular conveying cover (401).

10. A novel gas protection structure for a small punch testing machine according to claim 9, characterized in that, The conveying detection unit (400) further includes: a movable control plate (404) and a shaped connecting frame (405); the movable control plate (404) is slidably mounted on the L-shaped conveying pipe b (403), and a circular conveying hole b (4041) is provided on the movable control plate (404); the top end of the shaped connecting frame (405) is fixedly connected to the circular limiting frame b (304), and the bottom end of the shaped connecting frame (405) is fixedly connected to the movable control plate (404).

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