Mounting mechanism for test window of laser particle analyzer

Abstract

The utility model relates to the technical field of particle size testing, in particular to a mounting mechanism of a test window of a laser particle analyzer, which fixes the test window by arranging a fixing device, improves the connection strength and ensures the test result, and guides the test window by arranging a guide rail II and a guide rail III, reduces the alignment difficulty and improves the usability. Comprising a guide mechanism; the test window further comprises a test window body, two groups of guide sliding blocks, a grabbing device, a fixing device and a positioning device, the test window body is slidably mounted on the guide mechanism through the two groups of guide sliding blocks, the grabbing device and the fixing device are both mounted on the test window body, and the positioning device is mounted on the guide mechanism and the test window body; the guiding mechanism provides supporting and positioning and guides the guiding sliding block, the testing window body provides supporting, the guiding sliding block limits the movement position of the testing window body, the grabbing device facilitates taking out of the testing window body, the fixing device locks the testing window body, and the positioning device positions the testing window body.

Description

Technical Field

[0001] The utility model relates to the technical field of particle size testing, in particular to an installation mechanism for a test window of a laser particle size analyzer. Background Art

[0002] A laser particle size analyzer, an instrument for measuring and analyzing the abundance of physical particles, requires frequent cleaning of its test window during use. Therefore, the test window needs to be quickly disassembled and assembled.

[0003] For example, in a type of prior art represented by a utility model patent for an installation mechanism of a laser particle size test window with the publication number CN2775646Y, its main structure includes a guide rail, a spring, and a positioning post. The guide rail guides the test window, the spring presses the test window tightly, and the positioning block positions the installation position of the test window.

[0004] However, the following technical problems still exist in the use of existing technical equipment: only relying on friction to fix the position of the test window, the connection is not firm enough, it is easy to loosen, affecting the test results, and it is difficult to align and insert the existing test window into the guide rail. Summary of the Utility Model

[0005] To solve the above technical problems, the utility model provides an installation mechanism for a test window of a laser particle size analyzer, which fixes the test window by setting a fixing device, improves the connection strength, ensures the test results, and guides the test window by setting a second guide rail and a third guide rail, reduces the alignment difficulty, and improves the usability.

[0006] An installation mechanism for a test window of a laser particle size analyzer of the utility model includes a guiding mechanism; it also includes a test window body, two groups of guiding sliders, a grasping device, a fixing device, and a positioning device. The test window body is slidably installed on the guiding mechanism through the two groups of guiding sliders. The grasping device and the fixing device are both installed on the test window body, and the positioning device is installed on the guiding mechanism and the test window body; the guiding mechanism provides support and positioning, and guides the guiding sliders. The test window body provides support, the guiding sliders limit the movement position of the test window body, the grasping device facilitates the removal of the test window body, the fixing device locks the test window body, and the positioning device positions the test window body.

[0007] Preferably, the guiding mechanism includes a test window installation groove, two sets of guide rails I, two sets of guide rails II, and two sets of guide rails III. In the middle of the test window installation groove, there is an installation groove I. The top of the installation groove I slopes outward. At the left and right ends of the inclined section of the installation groove I, there are fixing grooves I. At the left and right ends of the bottom of the installation groove I, there are positioning grooves. The two sets of guide rails I are respectively fixedly installed on the left and right side walls of the installation groove I. The two sets of guide rails II are respectively installed at the tops of the two sets of guide rails I, and both sets of guide rails II slope outward from the installation groove I. The two sets of guide rails III are respectively installed at the tops of the two sets of guide rails II, and both sets of guide rails III slope outward from the installation groove I. The test window installation groove provides support and positioning. The cooperation between the guide rails III and the guide rails II makes it easier for the guiding slider to align with the guide rail I, improving usability.

[0008] Preferably, the test window body includes a test window frame, two sets of pipes, two brackets I, a bracket II, and two lenses. The test window frame is slidably installed in the installation groove I. The test window frame is generally C-shaped. At the top of the test window frame, there are a shaft hole and a gear groove. At the left and right ends of the test window frame, there are fixing grooves II. The top of the test window frame has a shape matching the inclined section of the installation groove I, and through grooves respectively matching the two sets of guide rails III are provided at the top of the test window frame. The two sets of pipes are respectively installed at the front and rear ends of the front side wall plate of the test window frame. The two brackets I and the bracket II are both installed at the bottom end of the top of the test window frame. Installation grooves II are respectively provided on the two brackets I. An installation groove III is provided on the bracket II. Through holes leading to the front end of the bracket II are provided at the upper and lower ends of the installation groove III. The rear set of pipes are respectively installed on the two through holes at the front end of the bracket II. The two lenses are respectively installed at the left and right ends of the installation groove III, providing installation positions for subsequent components.

[0009] Preferably, one set of guiding sliders includes a turntable, a limit block I, a limit block II, a slider, and multiple balls. Taking the right set of guiding sliders as an example, the turntable is rotatably installed in the installation groove II. The limit block I is fixedly installed at the left end of the turntable. The limit block II is fixedly installed at the left end of the right bracket I. A fan-shaped opening is provided on the limit block II, and the limit block I is located in the middle of the fan-shaped opening. The slider is fixedly installed at the right end of the turntable. Multiple spherical holes are provided on the slider, and the diameters of the multiple spherical holes are slightly smaller than their maximum diameters. The multiple balls are respectively rotatably installed in the multiple spherical holes. The turntable enables the slider to rotate, reducing the phenomenon that the test window body gets stuck on the guide rail I due to uneven force during the installation and disassembly of the test window body. The limit block II limits the position of the limit block I to enable the turntable to rotate only a limited angle, improving the directivity of the slider and enhancing the guiding performance. The diameter of the spherical hole is slightly smaller than its maximum diameter to prevent the balls from falling off. The balls reduce the friction between the slider and the guide rails I, II, and III.

[0010] Preferably, the grasping device includes a handle and two grips. The handle is rotatably mounted at the top end of the test window frame, and the two grips are respectively fixedly mounted at the front and rear ends of the test window frame; the handle provides power to the fixing device, and the grips facilitate the disassembly and assembly of the test window body.

[0011] Preferably, the fixing device includes a gear and two racks. The gear is rotatably mounted in the gear slot, a rotating shaft is provided at the top end of the gear, the rotating shaft is matched with the shaft hole, and the top end of the rotating shaft is fixedly connected to the bottom end of the handle. The two racks are respectively slidably mounted in the two fixing slots II, and after the test window body is installed in place, the two racks are respectively aligned with the two fixing slots I. The two racks are in threaded cooperation with the gear; the gear transmits power, and the racks fix the test window body.

[0012] Preferably, the positioning device includes a positioning block, a support III, two support IVs, a hook, a spring I, two spring IIs, a latch I and a latch II. The positioning block is mounted at the bottom end of the installation slot I, and an inclined surface is provided at the top end of the positioning block. The support III and the two support IVs are both mounted at the rear end of the front side wall plate of the test window frame. Two guiding slots are provided on the support III, and two guiding columns are provided on the hook. The hook is slidably mounted on the guiding slots through the two guiding columns. Two hooks I are provided at the front end of the hook, and an inclined slot is provided on the hook. The inclined surface is in sliding cooperation with the inclined slot, and this cooperation causes the hook to be pushed away from the front side wall plate of the test window frame when the hook moves downward. One end of the spring I is fixedly mounted at the rear end of the hook, and the other end of the spring I is fixedly mounted on the support III. One ends of the two spring IIs are respectively mounted at the front ends of the two support IVs. The latch I and the latch II are respectively slidably mounted on the two support IVs, and the latch I and the latch II are mirror-symmetrical. Mounting plates are provided at the rear ends of the latch I and the latch II, and the other ends of the two spring IIs are respectively mounted on the two mounting plates. Hooks II are provided at the tail ends of the latch I and the latch II, and the two hooks I and the two hooks II cooperate with each other respectively. The tops of the heads of the latch I and the latch II are both arc-shaped; the support III restricts the position of the hook so that the hook can only move back and forth, and the support IV restricts the positions of the latch I and the latch II so that the latch I and the latch II can only move left and right. When installing the test window body, the hook gradually approaches the positioning block. After the hook contacts the positioning block, under the sliding cooperation of the inclined surface and the inclined slot, the hook is pushed away from the front side wall plate of the test window frame, and the hook I and the hook II are disengaged. The latch I is pushed out to the left under the action of the spring II, and the latch II is pushed out to the right under the action of the spring II. When the latch I and the latch II move to the farthest position, they collide with the side wall of the positioning slot, making a "click" sound to indicate that the test window body is installed in place. When disassembling the test window body, the latch I and the latch II move upward, the hook is reset under the action of the spring I, the arc-shaped surfaces of the latch I and the latch II are pressed, causing the latch I and the latch II to both move closer to the center. Subsequently, the hook II presses the hook I to move the hook backward, causing the hook II to reset. Then the hook is reset under the action of the spring I, and the hook I and the hook II are re-mated to fix the positions of the latch I and the latch II.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: guiding the test window makes it easier to align the test window with the guide rail, improving the ease of use; and using a slider that can rotate to a limited extent, while maintaining the directivity of the slider, reducing the situation where the test window gets stuck on the guide rail due to uneven force during disassembly and assembly, improving the ease of use and the service life of the guide rail; and installing multiple ball bearings on the slider, reducing the friction between the slider and the guide rail, making it more labor-saving to disassemble and assemble the test window, and reducing the labor intensity of workers; and using a gear and rack to insert and fix the test window, improving the fixing strength of the test window, reducing vibration, and providing a better detection effect; and setting a grip to provide a grasping position during disassembly and assembly, improving the ease of use. Description of the Drawings

[0014] Figure 1 is an axonometric structural view of the present utility model;

[0015] Figure 2 is an axonometric structural view of the guiding mechanism;

[0016] Figure 3 is an axonometric structural view of the test window body;

[0017] Figure 4 is an axonometric structural view of a set of guiding sliders;

[0018] Figure 5 is an axonometric structural view of the grasping device;

[0019] Figure 6 is an axonometric structural view of the fixing device;

[0020] Figure 7 is an axonometric structural view of the positioning device;

[0021] Figure 8 is an axonometric sectional structural view of the positioning device.

[0022] Reference numerals in the drawings: 01, guiding mechanism; 11, test window installation groove; 12, guide rail 1; 13, guide rail 2; 14, guide rail 3; 02, test window body; 21, test window frame; 22, pipeline; 23, support 1; 24, support 2; 25, lens; 03, guiding slider; 31, turntable; 32, limit block 1; 33, limit block 2; 34, slider; 35, ball bearing; 04, grasping device; 41, handle; 42, grip; 05, fixing device; 51, gear; 52, rack; 06, positioning device; 61, positioning block 1; 62, support 3; 63, support 4; 64, hook; 65, spring 1; 66, spring 2; 67, latch 1; 68, latch 2. Detailed Embodiments

[0023] For ease of understanding the present utility model, the present utility model will be described more comprehensively below with reference to the relevant accompanying drawings. The present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present utility model more thorough and comprehensive.

[0024] An installation mechanism for a test window of a laser particle size analyzer of the present utility model includes a guiding mechanism 01; it also includes a test window body 02, two groups of guiding sliders 03, a gripping device 04, a fixing device 05 and a positioning device 06. The test window body 02 is slidably installed on the guiding mechanism 01 through the two groups of guiding sliders 03. The gripping device 04 and the fixing device 05 are both installed on the test window body 02, and the positioning device 06 is installed on the guiding mechanism 01 and the test window body 02; the guiding mechanism 01 provides support and positioning and guides the guiding sliders 03. The test window body 02 provides support, and the guiding sliders 03 limit the movement position of the test window body 02. The gripping device 04 facilitates the removal of the test window body 02, the fixing device 05 locks the test window body 02, and the positioning device 06 positions the test window body 02; the guiding mechanism 01 includes a test window installation groove 11, two groups of guide rails one 12, two groups of guide rails two 13 and two groups of guide rails three 14. In the middle of the test window installation groove 11, there is an installation groove one. The top of the installation groove one inclines outwards. At the left and right ends of the inclined section of the installation groove one, there are fixing grooves one. At the left and right ends of the bottom of the installation groove one, there are positioning grooves. The two groups of guide rails one 12 are respectively fixedly installed on the left and right side walls of the installation groove one. The two groups of guide rails two 13 are respectively installed at the tops of the two groups of guide rails one 12, and both of the two groups of guide rails two 13 incline outwards from the installation groove one. The two groups of guide rails three 14 are respectively installed at the tops of the two groups of guide rails two 13, and both of the two groups of guide rails three 14 incline outwards from the installation groove one; the test window body 02 includes a test window frame 21, two groups of pipes 22, two supports one 23, a support two 24 and two lenses 25. The test window frame 21 is slidably installed in the installation groove one. The test window frame 21 is integrally C-shaped. At the top of the test window frame 21, there are a shaft hole and a gear groove. At the left and right ends of the test window frame 21, there are fixing grooves two. The top of the test window frame 21 is in a shape matching the inclined section of the installation groove one, and at the top of the test window frame 21, there are through grooves respectively matching the two groups of guide rails three 14. The two groups of pipes 22 are respectively installed at the front and back ends of the front side wall plate of the test window frame 21. The two supports one 23 and the support two 24 are both installed at the bottom end of the top of the test window frame 21. There are installation grooves two respectively on the two supports one 23. There is an installation groove three on the support two 24. There are through holes leading to the front end of the support two 24 at the upper and lower ends of the installation groove three. The rear group of pipes 22 are respectively installed on the two through holes at the front end of the support two 24. The two lenses 25 are respectively installed at the left and right ends of the installation groove three;The set of guiding sliders 03 includes a turntable 31, a first limiting block 32, a second limiting block 33, a slider 34 and a plurality of ball bearings 35. Taking the set of guiding sliders 03 on the right side as an example, the turntable 31 is rotatably installed in the second installation groove. The first limiting block 32 is fixedly installed at the left end of the turntable 31. The second limiting block 33 is fixedly installed at the left end of the first bracket 23 on the right side. A sector-shaped opening is provided on the second limiting block 33, and the first limiting block 32 is located at the middle position of the sector-shaped opening. The slider 34 is fixedly installed at the right end of the turntable 31. A plurality of spherical holes are provided on the slider 34, and the diameters of the plurality of spherical holes are slightly smaller than their maximum diameters. The plurality of ball bearings 35 are respectively rotatably installed in the plurality of spherical holes. The grasping device 04 includes a handle 41 and two grips 42. The handle 41 is rotatably installed at the top end of the test window frame 21. The two grips 42 are respectively fixedly installed at the front and rear ends of the test window frame 21. The fixing device 05 includes a gear 51 and two racks 52. The gear 51 is rotatably installed in the gear groove. A rotating shaft is provided at the top end of the gear 51. The rotating shaft is in fit with the shaft hole, and the top end of the rotating shaft is fixedly connected to the bottom end of the handle 41. The two racks 52 are respectively slidably installed in the two second fixing grooves, and after the test window body 02 is installed in place, the two racks 52 are respectively aligned with the two first fixing grooves. The two racks 52 are in threaded fit with the gear 51. The positioning device 06 includes a positioning block 61, a third bracket 62, two fourth brackets 63, a hook 64, a first spring 65, two second springs 66, a first latch 67 and a second latch 68. The positioning block 61 is installed at the bottom end of the first installation groove. An inclined surface is provided at the top end of the positioning block 61. The third bracket 62 and the two fourth brackets 63 are both installed at the rear end of the front side wall plate of the test window frame 21. Two guiding grooves are provided on the third bracket 62. Two guiding columns are provided on the hook 64. The hook 64 is slidably installed on the guiding grooves through the two guiding columns. Two first hooks are provided at the front end of the hook 64. An inclined groove is provided on the hook 64. The inclined surface is in sliding fit with the inclined groove, and this fit causes the hook 64 to be pushed away from the front side wall plate of the test window frame 21 when moving downward. One end of the first spring 65 is fixedly installed at the rear end of the hook 64, and the other end of the first spring 65 is fixedly installed on the third bracket 62. One ends of the two second springs 66 are respectively installed at the front ends of the two fourth brackets 63. The first latch 67 and the second latch 68 are respectively slidably installed on the two fourth brackets 63, and the first latch 67 and the second latch 68 are mirror-symmetrical. Installation plates are provided at the rear ends of the first latch 67 and the second latch 68. The other ends of the two second springs 66 are respectively installed on the two installation plates. Second hooks are provided at the tail ends of the first latch 67 and the second latch 68, and the two first hooks and the two second hooks cooperate with each other respectively. The tops of the leading ends of the first latch 67 and the second latch 68 are both arc-shaped.;

[0025] Such as Figures 1 to 8As shown in the figure, an installation mechanism for a test window of a laser particle size analyzer of the present utility model, when in operation, first disassembles the test window body 02. Rotate the handle 41 to make the gear 51 rotate. The rotation of the gear 51 causes the rack 52 to leave the first fixing groove, and the test window frame 21 is released from fixation. When lifting, the turntable 31 enables the slider 34 to rotate, reducing the phenomenon that the test window body 02 gets stuck on the first guide rail 12 due to uneven force during the disassembly of the test window body 02. And by setting two grips 42, it is convenient to vertically lift the test window body 02, reducing the situation of uneven force. When lifting the test window body 02, the first latch 67 and the second latch 68 move upward, and the hook 64 is reset under the action of the first spring 65. The arc surfaces of the first latch 67 and the second latch 68 are pressed, causing the first latch 67 and the second latch 68 to move closer to the center. Subsequently, the second hook presses the first hook to move the hook 64 backward, resetting the second hook. After that, the hook 64 is reset under the action of the first spring 65, and the first hook and the second hook are re-mated to fix the positions of the first latch 67 and the second latch 68. Then, disassemble and clean the lens 25. After cleaning, install the lens 25 back. Then install the test window body 02. When installing the test window body 02, roughly align the test window body 02 with the first installation groove. Then, push the test window body 02 downward. The third guide rail 14 and the second guide rail 13 cooperate to guide the slider 34, making it easier for the slider 34 to align and enter the first guide rail 12. When lowering, the turntable 31 enables the slider 34 to rotate, reducing the phenomenon that the test window body 02 gets stuck on the first guide rail 12 due to uneven force during the installation of the test window body 02. And by setting two grips 42, it is convenient to vertically lower the test window body 02, reducing the situation of uneven force. When installing the test window body 02, the hook 64 gradually approaches the positioning block 61. After the hook 64 contacts the positioning block 61, under the sliding fit of the inclined surface and the inclined groove, the hook 64 is pushed in the direction away from the front side wall plate of the test window frame 21. The first hook and the second hook are disengaged. The first latch 67 is pushed out to the left under the action of the second spring 66, and the second latch 68 is pushed out to the right under the action of the second spring 66. When the first latch 67 and the second latch 68 move to the farthest position, they collide with the side wall of the positioning groove, making a "click" sound, indicating that the test window body 02 is installed in place. Then, rotate the handle 41 to make the gear 51 rotate. The rotation of the gear 51 causes the rack 52 to enter the first fixing groove to fix the test window frame 21.

[0026] The first spring 65 and the two second springs 66 of the present utility model are purchased on the market. Those skilled in the industry only need to install and operate according to the attached user manual, without the need for creative labor from those skilled in the art.

[0027] The main functions achieved by the present utility model are as follows: the test window is fixed by setting the fixing device 05 to enhance the connection strength and ensure the test results. Moreover, by setting the second guide rail 13 and the third guide rail 14, the test window is guided, reducing the alignment difficulty and improving the usability. It solves the prior art problems that only relying on friction to fix the position of the test window, the connection is not firm enough, it is easy to loosen, affecting the test results, and the existing test window is difficult to align and insert into the guide rail.

[0028] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A laser particle size analyzer test window installation mechanism, comprising a guide mechanism (01); characterized in that: The invention also comprises a test window body (02), two groups of guide sliders (03), a gripping device (04), a fixing device (05) and a positioning device (06); the test window body (02) is slidably mounted on the guide mechanism (01) through the two groups of guide sliders (03); the gripping device (04) and the fixing device (05) are both mounted on the test window body (02); and the positioning device (06) is mounted on the guide mechanism (01) and the test window body (02); the guide mechanism (01) provides support and positioning and guides the guide sliders (03); the test window body (02) provides support; the guide sliders (03) limit the movement position of the test window body (02); the gripping device (04) facilitates the removal of the test window body (02); the fixing device (05) locks the test window body (02); and the positioning device (06) positions the test window body (02).

2. The installation mechanism of the laser particle size analyzer test window according to claim 1, characterized in that: The guide mechanism (01) comprises a test window installation groove (11), two groups of guide rails one (12), two groups of guide rails two (13) and two groups of guide rails three (14). The test window installation groove (11) is provided with an installation groove one in the middle part, the top of the installation groove one is inclined outward, the left and right ends of the inclined section of the installation groove one are provided with fixed grooves one, and the left and right ends of the bottom of the installation groove one are provided with positioning grooves. The two groups of guide rails one (12) are respectively fixedly installed on the left and right end side walls of the installation groove one, the two groups of guide rails two (13) are respectively installed on the top ends of the two groups of guide rails one (12), and the two groups of guide rails two (13) are both inclined toward the outside of the installation groove one, and the two groups of guide rails three (14) are respectively installed on the top ends of the two groups of guide rails two (13), and the two groups of guide rails three (14) are both inclined toward the outside of the installation groove one.

3. The installation mechanism of the laser particle size analyzer test window as claimed in claim 2, characterized in that: The test window body (02) comprises a test window frame (21), two groups of pipes (22), two brackets (23), a bracket (24) and two lenses (25). The test window frame (21) is slidably mounted in the mounting groove (1). The test window frame (21) is in a C shape as a whole. The top of the test window frame (21) is provided with an axial hole and a gear groove. The left and right ends of the test window frame (21) are provided with fixing grooves (2). The top of the test window frame (21) is in a shape that matches the inclined section of the mounting groove (1). The top of the test window frame (21) is provided with two guide rails (14) that are respectively connected to the two guide rails (14). ) are matched with a through groove, two groups of pipes (22) are respectively installed at the front and rear ends of the front side wall plate of the test window frame (21), two brackets (23) and brackets (24) are both installed at the top and bottom ends of the test window frame (21), the two brackets (23) are respectively provided with mounting grooves (2), the brackets (24) are provided with mounting grooves (3), the upper and lower ends of the mounting grooves (3) are both provided with flow holes leading to the front end of the brackets (24), a group of pipes (22) at the rear are respectively installed on the two flow holes at the front end of the brackets (24), and two lenses (25) are respectively installed at the left and right ends of the mounting grooves (3).

4. The installation mechanism of the laser particle size analyzer test window as claimed in claim 3, characterized in that: The group of guide sliders (03) comprises a rotating disk (31), a limit block 1 (32), a limit block 2 (33), a slider (34) and a plurality of ball bearings (35). Taking the group of guide sliders (03) on the right side as an example, the rotating disk (31) is rotatably mounted in the second mounting groove, the limit block 1 (32) is fixedly mounted on the left end of the rotating disk (31), the limit block 2 (33) is fixedly mounted on the left end of the bracket 1 (23) on the right side, a fan-shaped opening is provided on the limit block 2 (33), and the limit block 1 (32) is located in the middle position of the fan-shaped opening, the slider (34) is fixedly mounted on the right end of the rotating disk (31), a plurality of spherical holes are provided on the slider (34), the diameters of the plurality of spherical holes are slightly smaller than the maximum diameter of the plurality of spherical holes, and the plurality of ball bearings (35) are rotatably mounted in the plurality of spherical holes respectively.

5. The installation mechanism of the laser particle size analyzer test window as claimed in claim 3, characterized in that: The gripping device (04) comprises a handle (41) and two grips (42), wherein the handle (41) is rotatably mounted on the top of the test window frame (21), and the two grips (42) are fixedly mounted on the front and rear ends of the test window frame (21), respectively.

6. The installation mechanism of the laser particle size analyzer test window as claimed in claim 5, characterized in that: The fixing device (05) comprises a gear (51) and two racks (52). The gear (51) is rotatably mounted in the gear groove. A rotating shaft is arranged at the top of the gear (51). The rotating shaft is matched with the shaft hole, and the top of the rotating shaft is fixedly connected to the bottom of the handle (41). The two racks (52) are respectively slidably mounted in the two fixing grooves 2, and the two racks (52) are respectively aligned with the two fixing grooves 1 after the test window body (02) is installed in place. The two racks (52) are threadedly matched with the gear (51).

7. The installation mechanism of the laser particle size analyzer test window as claimed in claim 3, characterized in that: The positioning device (06) comprises a positioning block (61), a bracket three (62), two bracket fours (63), a hook (64), a spring one (65), two spring twos (66), a latch one (67) and a latch two (68), wherein the positioning block (61) is mounted at the bottom end of the mounting groove one, and an inclined surface is arranged at the top end of the positioning block (61), the bracket three (62) and the two bracket fours (63) are both mounted at the rear end of the front side wall plate of the test window frame (21), the bracket three (62) is provided with two guide grooves, the hook (64) is provided with two guide posts, the hook (64) is slidably mounted on the guide groove via the two guide posts, the front end of the hook (64) is provided with two latch hooks one, the hook (64) is provided with an inclined groove, the inclined surface is slidably matched with the inclined groove, and the matching makes the hook (64) be pushed away when it moves downward. In the direction away from the front side wall plate of the test window frame (21), one end of the spring one (65) is fixedly mounted on the rear end of the hook (64), and the other end of the spring one (65) is fixedly mounted on the bracket three (62). One ends of the two spring twos (66) are respectively mounted on the front ends of the two bracket fours (63). The first latch (67) and the second latch (68) are respectively slidably mounted on the two bracket fours (63), and the first latch (67) and the second latch (68) are mirror-symmetrical. The rear ends of the first latch (67) and the second latch (68) are both provided with mounting plates. The other ends of the two spring twos (66) are respectively mounted on the two mounting plates. The tail ends of the first latch (67) and the second latch (68) are both provided with hooks two, and the two hooks one cooperate with the two hooks two, and the tops of the head ends of the first latch (67) and the second latch (68) are both arc-shaped.

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