Embedded vacuum nozzle structure and vacuumizing method thereof

Abstract

According to the embedded vacuum nozzle structure and the vacuumizing method thereof, when the air tightness of a vacuum nozzle is reduced, a pressing ring is pressed downwards to drive a linkage piece to drive a clamping piece to be separated from a clamping groove in the outer side of a connecting block, and then the connecting block and a connecting pipe can be conveniently taken out of a ring shell; therefore, a worker can maintain and replace the connecting pipe and the piston assembly, and the vacuum nozzle can be replaced and maintained on the premise that the vacuum nozzle does not need to be integrally taken out of a vacuum bag.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum nozzles and relates to an embedded vacuum nozzle structure and a vacuuming method thereof. Background Art

[0002] Most existing composite parts require the preparation of sealing bags during pre-evacuation and curing, and the internal gas is exhausted by connecting a vacuum nozzle to a vacuum air source to ensure the internal quality of the parts. However, existing vacuum nozzles are all one-piece structures, which are placed in the sealing bag in advance when making the sealing bag. The vacuum nozzle is then extended out of the sealing bag by cutting a hole in the sealing bag, and the vacuum nozzle is fixed to the vacuum bag with additional bolts for subsequent vacuuming operations. After long-term use, some parts of the vacuum nozzle will be damaged, which will lead to reduced air tightness of the sealing bag, making it inconvenient to repair and replace during maintenance, and the disassembly and assembly operations are relatively troublesome. In view of the above problems, the present invention proposes an embedded vacuum nozzle structure and a vacuuming method thereof. Summary of the invention

[0003] The object of the present invention is to provide an embedded vacuum nozzle structure and a vacuuming method thereof. When the air tightness of the vacuum nozzle is reduced, the vacuum nozzle connecting part can be disassembled and replaced without taking the vacuum nozzle as a whole out of the vacuum bag, thereby improving the efficiency of the vacuuming operation.

[0004] The present invention is achieved through the following technical solutions: An embedded vacuum nozzle structure comprises a connecting tube, wherein a piston assembly which opens or closes with changes in air pressure is arranged inside the connecting tube, a connecting block is sleeved on the outside of the connecting tube, and an annular shell is sleeved on the outside of the connecting block, a clamping piece is arranged on the inner annular surface of the annular shell so as to slide radially along the connecting tube, and a clamping groove which is correspondingly engaged with the clamping piece is arranged on the outer side wall of the connecting block; a pressure ring is arranged on the top of the annular shell so as to slide axially along the connecting tube, and the bottom end of the pressure ring extends to the inside of the annular shell and is connected to one side of the clamping piece through a linkage piece, and the pressure ring slides axially along the connecting tube to drive the linkage piece to drive the clamping piece to slide radially along the connecting tube.

[0005] One end of the connecting tube is connected to the vacuum bag, and the other end of the connecting tube is connected to the vacuum pump. The vacuum pump is turned on to extract the air inside the connecting tube, so that the air pressure on the side of the piston assembly close to the vacuum pump is lower than the air pressure on the side of the piston assembly close to the vacuum bag. At this time, the piston assembly moves away from the vacuum bag under the action of the air pressure difference to open the connecting tube, and then the air inside the vacuum bag can be sucked through the vacuum pump. After the vacuum bag reaches a vacuum state, the vacuum pump stops, and the piston assembly is reset to close the connecting tube to prevent external air from entering the vacuum bag through the connecting tube.

[0006] After the vacuum bag is evacuated, let it stand for a while and test the vacuum degree of the vacuum bag. If the vacuum degree of the vacuum bag meets the standard after a period of time, the vacuum operation is completed; if the vacuum degree of the vacuum bag does not meet the standard after a period of time, it indicates that external air has entered the vacuum bag through the connecting pipe. At this time, the pressure ring is moved axially to drive the clamping part to move away from the connecting block through the linkage part, so that the clamping part is disengaged from the clamping groove, and then the connecting pipe can be disassembled as a whole. Then, the air tightness of the connecting pipe and the piston assembly is tested to eliminate the leakage point.

[0007] In order to better realize the present invention, further, the engaging part includes a slide plate, a first spring, and a clamping rod. The slide plate is arranged inside the annular shell along the radial sliding of the connecting tube. A clamping rod is arranged at one end of the slide plate close to the connecting block. The end of the clamping rod passes through the inner annular surface of the annular shell and is arranged corresponding to the clamping groove. The top of the clamping rod is hinged to the linkage part; a first spring is arranged at one end of the slide plate away from the connecting block.

[0008] In order to better implement the present invention, further, a first T-shaped groove is provided on the inner bottom surface of the annular shell along the radial direction of the connecting pipe, and a first T-shaped block is provided at the bottom of the slide plate to be slidably connected with the first T-shaped groove.

[0009] In order to better realize the present invention, further, the linkage part includes a connecting rod, a cross plate, and a pressure rod. The cross plate is set inside the annular shell along the axial sliding of the connecting tube. A pressure rod is set on the top of the cross plate. The pressure rod passes through the top surface of the annular shell and is connected to the bottom of the pressure ring; the bottom of the cross plate is hinged to the first end of the connecting rod, and the second end of the connecting rod is hinged to the top of the clamping rod.

[0010] In order to better implement the present invention, further, a second T-shaped groove is provided on the side wall of the inner part of the annular shell close to the connecting block along the axial direction of the connecting pipe, and a second T-shaped block is provided at one end of the cross plate close to the connecting block and is slidably connected to the second T-shaped groove.

[0011] In order to better realize the present invention, further, the piston assembly includes a fixed plate, a telescopic sleeve, a plug piston, and a second spring. The fixed plate is arranged inside the connecting tube, and an air port is arranged at the center of the fixed plate; a telescopic sleeve is coaxially arranged above the fixed plate, and a plug piston matching the air port is arranged at one end of the telescopic sleeve close to the air port, and a second spring is sleeved on the outside of the telescopic sleeve, and one end of the second spring is in contact with the plug piston.

[0012] In order to better implement the present invention, further, a frustoconical air port is provided at the center of the fixing plate, and the plug piston is a frustoconical piston.

[0013] In order to better implement the present invention, further, a mounting plate is provided at the bottom of the annular shell, a mounting hole for the connecting pipe to pass through is provided at the center of the mounting plate, and a rubber ring is provided between the hole wall of the mounting hole and the outer tube wall of the connecting pipe.

[0014] A vacuuming method is implemented based on the above-mentioned embedded vacuum nozzle structure, comprising the following steps: Step 1: Press the pressing ring downward to drive the engaging piece to slide radially back to the inside of the ring shell, and fit the connecting block into the center hole of the ring shell; lift the pressing ring upward to drive the engaging piece to slide radially out to the slot on the outer wall of the connecting block, so as to fix the connecting block and the connecting pipe; Step 2: a vacuum bag is placed on the bottom of the connecting tube, and a vacuum pump is connected to the top of the connecting tube; the air in the connecting tube is sucked by the vacuum pump so that the air pressure at the top of the piston assembly is less than the air pressure at the bottom of the piston assembly, and the piston assembly is moved upward to open, so as to evacuate the vacuum bag; Step 3, turn off the vacuum pump, so that the air pressure at the top of the piston assembly is greater than the air pressure at the bottom of the piston assembly, and the piston assembly moves upward to close; let the vacuum bag stand to detect the vacuum degree, if the vacuum degree meets the standard, the vacuum operation is completed, if the vacuum degree does not meet the standard, proceed to the next step; Step 4: Press the pressure ring downward to drive the engaging part to slide radially back to the inside of the ring shell, remove the connecting block from the center hole of the ring shell, and then check the air tightness of the connecting pipe and piston assembly.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention can, when the air tightness of the vacuum nozzle is reduced, press down the pressure ring to drive the linkage part to drive the engaging part to disengage from the clamping groove on the outer side of the connecting block, so that the connecting block and the connecting pipe can be conveniently taken out from the ring shell, so that the staff can perform maintenance and replacement of the connecting pipe and the piston assembly, and the vacuum nozzle can be replaced and maintained without taking the vacuum nozzle out of the vacuum bag as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the embedded vacuum nozzle structure; Figure 2 It is a top view of the embedded vacuum nozzle structure; Figure 3 for Figure 2 AA section view; Figure 4 This is a schematic diagram of the installation of the clamping rod; Figure 5 This is a schematic diagram of the installation of the connecting pipe.

[0017] Wherein: 1. mounting plate; 2. mounting hole; 3. connecting pipe; 4. connecting block; 5. slot; 6. ring shell; 7. slide plate; 8. first spring; 9. clamping rod; 10. connecting rod; 11. cross plate; 12. pressure rod; 13. pressure ring; 14. fixing plate; 15. cone-shaped air port; 16. strip plate; 17. telescopic sleeve; 18. plug piston; 19. second spring; 20. first T-shaped block; 21. first T-shaped slot; 22. second T-shaped block; 23. second T-shaped slot; 24. radial through hole; 25. axial sliding hole; 26. pipe cover; 27. rubber ring; 28. rubber sleeve. DETAILED DESCRIPTION

[0018] The following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0019] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the present invention explicitly states otherwise, singular forms are also intended to include plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0020] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0021] Terminology explanation section: The terms "install", "connect", "connect", "fixed" and the like in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0022] Embodiment 1: An embedded vacuum nozzle structure of this embodiment, such as Figure 1-Figure 5As shown, it includes a connecting tube 3, the interior of which is provided with a piston assembly that opens or closes with the change of air pressure, the outside of which is sleeved with a connecting block 4, the outside of which is sleeved with an annular shell 6, the inner ring surface of which is provided with a clamping piece for radial sliding along the connecting tube 3, and the outer side wall of which is provided with a clamping groove 5 that is correspondingly engaged with the clamping piece; a pressure ring 13 is provided on the top of the annular shell 6 for axial sliding along the connecting tube 3, the bottom end of the pressure ring 13 extends to the inside of the annular shell 6 and is connected to one side of the clamping piece through a linkage piece, and the pressure ring 13 slides along the axial direction of the connecting tube 3 to drive the linkage piece to drive the clamping piece to slide along the radial direction of the connecting tube 3.

[0023] The bottom outer side of the connecting pipe 3 is welded or threadedly mounted with a connecting block 4, and the top outer side wall of the connecting pipe 3 is provided with an external thread, through which a pipe cover 26 is screwed and mounted at the top opening of the connecting pipe 3, thereby preventing external debris from entering the interior of the connecting pipe 3 during non-working hours. A strip plate 16 is provided inside the connecting pipe 3, and a piston assembly is installed at the bottom of the strip plate 16.

[0024] A center hole matching the outer contour of the connecting block 4 is provided at the center of the annular shell 6. Four groups of engaging parts that can slide along the radial direction of the connecting pipe 3 are evenly spaced on the inner annular surface of the annular shell 6. At the same time, four groups of slots 5 are provided on the outer wall of the connecting block 4 at positions corresponding to the four groups of engaging parts. A pressing ring 13 is provided on the top of the annular shell 6 to slide along the axial direction of the connecting pipe 3. The bottom of the pressing ring 13 is connected to the engaging part through a linkage. When the pressing ring 13 is pressed down, the pressing ring 13 drives the linkage to drive the engaging part to move in a direction away from the connecting block 4, so that the engaging part is disengaged from the slot 5. At this time, the connecting block 4 and the connecting pipe 3 can be taken out from the center hole of the annular shell 6. When the pressing ring 13 is pulled up, the pressing ring 13 drives the linkage to drive the engaging part to move in a direction close to the connecting block 4, so that the engaging part and the slot 5 are engaged. At this time, the connecting block 4 and the connecting pipe 3 can be fixed in the center hole of the annular shell 6.

[0025] The piston assembly inside the connecting tube 3 can open or close the connecting tube 3 under the action of air pressure. The bottom end of the connecting tube 3 is connected to the vacuum bag, and the top end of the connecting tube 3 is connected to the vacuum pump. Start the vacuum pump to extract the air at the top of the piston assembly in the connecting tube 3, so that the air pressure at the top of the piston assembly is lower than the air pressure at the bottom of the piston assembly. At this time, the piston assembly moves upward under the action of the pressure difference to open the connecting tube 3, ensuring that the vacuum pump can extract the air in the vacuum bag through the connecting tube 3.

[0026] After the vacuum bag is sucked to a vacuum state, the vacuum pump is turned off. At this time, the piston assembly is reset and moved downward to close the connecting pipe 3 to prevent external air from entering the vacuum bag through the connecting pipe 3. Check the vacuum degree of the vacuum bag. If the vacuum degree of the vacuum bag does not meet the standard, it indicates that the air tightness of the connecting pipe 3 or the piston assembly is insufficient, causing external air to enter the vacuum bag through the connecting pipe 3. At this time, press the pressure ring 13 downward, and the pressure ring 13 drives the linkage to drive the engaging part to move away from the connecting block 4, so that the engaging part is disengaged from the card slot 5. At this time, the connecting block 4 and the connecting pipe 3 can be taken out of the center hole of the ring shell 6, and then the air tightness of the connecting pipe 3 and the piston assembly can be tested, and the components with leaks can be maintained or replaced.

[0027] Embodiment 2: An embedded vacuum nozzle structure is improved on the basis of Example 1, such as Figure 3 As shown, the engaging member includes a slide plate 7, a first spring 8, and a clamping rod 9. The slide plate 7 is arranged inside the annular shell 6 for radial sliding along the connecting tube 3. The clamping rod 9 is arranged at one end of the slide plate 7 close to the connecting block 4. The end of the clamping rod 9 passes through the inner annular surface of the annular shell 6 and is arranged corresponding to the clamping groove 5. The top of the clamping rod 9 is hinged to the linkage member; the first spring 8 is arranged at one end of the slide plate 7 away from the connecting block 4.

[0028] The wall of the central hole of the ring shell 6 is provided with a radial through hole 24 for the radial sliding of the clamping rod 9. When the pressing ring 13 is pressed down, the pressing ring 13 drives the linkage member to be pressed down, so that the linkage member shakes and drives the slide plate 7 and the clamping rod 9 to slide in the direction away from the connecting block 4, so that the end of the clamping rod 9 is disengaged from the clamping groove 5 on the side wall of the connecting block 4, and the first spring 8 is in a compressed state. When the downward pressure of the pressing ring 13 is removed, the first spring 8 rebounds in the direction of the connecting block 4, thereby driving the slide plate 7 and the clamping rod 9 to slide in the direction close to the connecting block 4, and the end of the clamping rod 9 enters the clamping groove 5 and is clamped with the clamping groove 5, and at the same time, the pressing ring 13 is also lifted up and reset under the reaction force of the linkage member.

[0029] Furthermore, a first T-shaped groove 21 is provided on the inner bottom surface of the ring shell 6 along the radial direction of the connecting tube 3, and a first T-shaped block 20 is provided at the bottom of the slide plate 7 to be slidably connected with the first T-shaped groove 21. Through the slidable cooperation between the first T-shaped groove 21 and the first T-shaped block 20, it is possible to ensure that the slide plate 7 and the clamping rod 9 strictly slide along the radial direction of the connecting tube 3, thereby ensuring that the end of the clamping rod 9 can smoothly enter the clamping groove 5.

[0030] The other parts of this embodiment are the same as those of Embodiment 1, and thus will not be described in detail.

[0031] Embodiment 3: An embedded vacuum nozzle structure is improved on the basis of embodiment 1 or 2, such as Figure 3As shown, the linkage comprises a connecting rod 10, a transverse plate 11 and a pressure rod 12. The transverse plate 11 is slidably arranged inside the annular shell 6 along the axial direction of the connecting tube 3. A pressure rod 12 is arranged on the top of the transverse plate 11. The pressure rod 12 passes through the top surface of the annular shell 6 and is connected to the bottom of the pressure ring 13. The bottom of the transverse plate 11 is hinged to the first end of the connecting rod 10, and the second end of the connecting rod 10 is hinged to the top of the clamping rod 9.

[0032] The top surface of the ring shell 6 is provided with an axial sliding hole 25 for the axial sliding of the pressure rod 12. The pressure ring 13 is pressed down, and the pressure rod 12 drives the cross plate 11 to slide downward along the axial direction of the connecting pipe 3, and then drives the clamping rod 9 to slide in the direction away from the connecting block 4 through the connecting rod 10. When the downward pressure of the pressure ring 13 is removed, the first spring 8 rebounds in the direction of the connecting block 4, and then drives the slide plate 7 and the clamping rod 9 to slide in the direction close to the connecting block 4, and the end of the clamping rod 9 enters the clamping groove 5 and clamps with the clamping groove 5, and at the same time, the pressure ring 13 is also lifted up and reset under the reaction force of the connecting rod 10.

[0033] Furthermore, a second T-shaped groove 23 is provided on the side wall of the inner part of the annular shell 6 near the connecting block 4 along the axial direction of the connecting pipe 3, and a second T-shaped block 22 is provided at one end of the transverse plate 11 near the connecting block 4 to be slidably connected with the second T-shaped groove 23. The sliding cooperation between the second T-shaped groove 23 and the second T-shaped block 22 can ensure that the transverse plate 11 slides strictly along the axial direction of the connecting pipe 3.

[0034] The other parts of this embodiment are the same as those of Embodiment 1 or 2, and thus will not be described in detail.

[0035] Embodiment 4: An embedded vacuum nozzle structure is improved on the basis of any one of embodiments 1-3, such as Figure 3 As shown, the piston assembly includes a fixed plate 14, a telescopic sleeve 17, a plug piston 18, and a second spring 19. The fixed plate 14 is arranged inside the connecting pipe 3, and a gas port is arranged at the center of the fixed plate 14; a telescopic sleeve 17 is coaxially arranged above the fixed plate 14, and a plug piston 18 matching the gas port is arranged at one end of the telescopic sleeve 17 close to the gas port, and a second spring 19 is sleeved on the outside of the telescopic sleeve 17, and one end of the second spring 19 is in contact with the plug piston 18.

[0036] A strip plate 16 is provided inside the connecting tube 3, a telescopic sleeve 17 is installed at the bottom of the strip plate 16, the top of the second spring 19 is connected to the bottom of the strip plate 16, and the bottom of the second spring 19 abuts against the top of the plug piston 18. When the vacuum pump is working, the air pressure at the top of the plug piston 18 is lower than the air pressure at the bottom thereof, and at this time, the plug piston 18 moves upward under the action of the pressure difference to open the air port on the fixed plate 14, and the second spring 19 is in a compressed state.

[0037] After the vacuum pump is shut down, the second spring 19 drives the plug piston 18 to move downward, so that the plug piston 18 closes the air port on the fixing plate 14 again.

[0038] Furthermore, a frustoconical air port 15 is provided at the center of the fixing plate 14 , and the plug piston 18 is a frustoconical piston. A rubber sleeve 28 is provided on the surface of the plug piston 18 , which further improves the air tightness of the plug piston 18 and the frustoconical air port 15 .

[0039] The other parts of this embodiment are the same as any one of Embodiments 1-3, so they are not described again.

[0040] Embodiment 5: An embedded vacuum nozzle structure is improved on the basis of any one of embodiments 1-4, such as Figure 1 The bottom of the annular shell 6 is provided with a mounting plate 1, the center of the mounting plate 1 is provided with a mounting hole 2 for the connecting pipe 3 to pass through, and a rubber ring 27 is provided between the hole wall of the mounting hole 2 and the outer tube wall of the connecting pipe 3. By providing the rubber ring 27, the air tightness between the connecting pipe 3 and the mounting plate 1 can be ensured, and external air is prevented from entering the vacuum bag through the gap between the connecting pipe 3 and the mounting plate 1.

[0041] The other parts of this embodiment are the same as any one of Embodiments 1-4, so they are not described again.

[0042] Embodiment 7: A vacuuming method is implemented based on an embedded vacuum nozzle structure, comprising the following steps: Step 1: Press the pressing ring 13 downward to drive the engaging member to radially slide back to the inside of the ring shell 6, and fit the connecting block 4 into the center hole of the ring shell 6; lift the pressing ring 13 upward to drive the engaging member to radially slide out into the slot 5 on the outer wall of the connecting block 4, so as to fix the connecting block 4 and the connecting pipe 3; Step 2: a vacuum bag is placed on the bottom end of the connecting tube 3, and a vacuum pump is connected to the top end of the connecting tube 3; the air in the connecting tube 3 is sucked by the vacuum pump so that the air pressure at the top of the piston assembly is lower than the air pressure at the bottom of the piston assembly, and the piston assembly is moved upward to open, so as to evacuate the vacuum bag; Step 3, turn off the vacuum pump, so that the air pressure at the top of the piston assembly is greater than the air pressure at the bottom of the piston assembly, and the piston assembly moves upward to close; let the vacuum bag stand to detect the vacuum degree, if the vacuum degree meets the standard, the vacuum operation is completed, if the vacuum degree does not meet the standard, go to step 4; Step 4: Press the pressing ring 13 downward to drive the engaging member to slide radially back to the inside of the annular shell 6, remove the connecting block 4 from the center hole of the annular shell 6, and then check the air tightness of the connecting pipe 3 and the piston assembly.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. An embedded vacuum nozzle structure, comprising a connecting pipe (3), characterized in that: The connecting tube (3) is provided with a piston assembly which opens or closes in response to changes in gas pressure. The connecting tube (3) is sleeved with a connecting block (4) on the outside. The connecting block (4) is sleeved with an annular shell (6) on the outside. A clamping piece is provided on the inner annular surface of the annular shell (6) so as to slide radially along the connecting tube (3). A clamping groove (5) corresponding to the clamping piece is provided on the outer wall of the connecting block (4). A pressure ring (13) is provided on the top of the annular shell (6) so as to slide axially along the connecting tube (3). The bottom end of the pressure ring (13) extends into the inside of the annular shell (6) and is connected to one side of the clamping piece via a linkage. The pressure ring (13) slides axially along the connecting tube (3) to drive the linkage to drive the clamping piece to slide radially along the connecting tube (3).

2. The embedded vacuum nozzle structure according to claim 1, characterized in that: The engaging member comprises a slide plate (7), a first spring (8), and a clamping rod (9); the slide plate (7) is arranged inside the annular shell (6) so as to slide radially along the connecting tube (3); a clamping rod (9) is arranged at one end of the slide plate (7) close to the connecting block (4); an end of the clamping rod (9) passes through the inner annular surface of the annular shell (6) and is arranged corresponding to the clamping groove (5); and a top of the clamping rod (9) is hinged to a linkage member; and a first spring (8) is arranged at one end of the slide plate (7) away from the connecting block (4).

3. The embedded vacuum nozzle structure according to claim 2, characterized in that: A first T-shaped groove (21) is provided on the inner bottom surface of the annular shell (6) along the radial direction of the connecting pipe (3), and a first T-shaped block (20) is provided at the bottom of the slide plate (7) and is slidably connected to the first T-shaped groove (21).

4. The embedded vacuum nozzle structure according to claim 3, characterized in that: The linkage member comprises a connecting rod (10), a transverse plate (11), and a pressure rod (12); the transverse plate (11) is slidably arranged inside the annular shell (6) along the axial direction of the connecting tube (3); a pressure rod (12) is arranged on the top of the transverse plate (11); the pressure rod (12) passes through the top surface of the annular shell (6) and is connected to the bottom of the pressure ring (13); the bottom of the transverse plate (11) is hinged to the first end of the connecting rod (10), and the second end of the connecting rod (10) is hinged to the top of the clamping rod (9).

5. The embedded vacuum nozzle structure according to claim 4, characterized in that: A second T-shaped groove (23) is provided on a side wall of the annular shell (6) near the connecting block (4) along the axial direction of the connecting pipe (3), and a second T-shaped block (22) is provided at one end of the transverse plate (11) near the connecting block (4) and is slidably connected to the second T-shaped groove (23).

6. An embedded vacuum nozzle structure according to any one of claims 1 to 5, characterized in that: The piston assembly comprises a fixed plate (14), a telescopic sleeve (17), a plug piston (18), and a second spring (19); the fixed plate (14) is arranged inside the connecting pipe (3); a gas port is arranged at the center of the fixed plate (14); a telescopic sleeve (17) is coaxially arranged above the fixed plate (14); a plug piston (18) matching the gas port is arranged at one end of the telescopic sleeve (17) close to the gas port; a second spring (19) is sleeved on the outside of the telescopic sleeve (17); one end of the second spring (19) contacts the plug piston (18).

7. The embedded vacuum nozzle structure according to claim 4, characterized in that: A frustoconical air port (15) is provided at the center of the fixed plate (14), and the plug piston (18) is a frustoconical piston.

8. An embedded vacuum nozzle structure according to any one of claims 1 to 5, characterized in that: A mounting plate (1) is provided at the bottom of the annular shell (6), a mounting hole (2) for the connecting pipe (3) to pass through is provided at the center of the mounting plate (1), and a rubber ring (27) is provided between the hole wall of the mounting hole (2) and the outer tube wall of the connecting pipe (3).

9. A vacuuming method, implemented based on the embedded vacuum nozzle structure according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Press the pressing ring (13) downward to drive the engaging member to slide radially and retract into the interior of the ring shell (6), and fit the connecting block (4) into the center hole of the ring shell (6); lift the pressing ring (13) upward to drive the engaging member to slide radially and extend into the slot (5) on the outer wall of the connecting block (4), thereby fixing the connecting block (4) and the connecting pipe (3); Step 2: a vacuum bag is placed on the bottom end of the connecting tube (3), and a vacuum pump is connected to the top end of the connecting tube (3); the air in the connecting tube (3) is sucked by the vacuum pump so that the air pressure at the top of the piston assembly is lower than the air pressure at the bottom of the piston assembly, and the piston assembly is moved upward to open, so as to evacuate the vacuum bag; Step 3, turn off the vacuum pump, so that the air pressure at the top of the piston assembly is greater than the air pressure at the bottom of the piston assembly, and the piston assembly moves upward to close; let the vacuum bag stand to detect the vacuum degree, if the vacuum degree meets the standard, the vacuum operation is completed, if the vacuum degree does not meet the standard, go to step 4; Step 4: Press the pressing ring (13) downward to drive the engaging member to slide radially back into the ring shell (6), remove the connecting block (4) from the center hole of the ring shell (6), and then check the air tightness of the connecting pipe (3) and the piston assembly.

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