Device for detecting air tightness of inner molded surface of spray pipe

Abstract

The invention discloses a device for detecting the airtightness of an inner molded surface of a spray pipe, and belongs to the technical field of spray pipe airtightness detection.The device comprises a centering clamping device, an automatic soapy water brushing device and an airtight container main body connected with a spray pipe main body, and the spray pipe main body is provided with an end part capable of being connected with a combustion chamber outlet and a divergent part integrally formed with the end part; the end, deviating from the diverging part, of the end is detachably connected with a blocking cover, the end provided with the blocking cover partially extends into the airtight container body and is connected with the airtight container body in a sealing fit mode on the outer side of the end, and the airtight container body is connected with external inflation equipment. The centering clamping device comprises a platform provided with two sliding grooves perpendicular to each other. Defects, cracks, leakage points and the like on the spray pipe main body can be conveniently identified, so that airtightness detection is completed, the airtightness detection quality and the operation efficiency are effectively ensured, the universality of airtightness detection is improved, and the airtightness detection requirement of a to-be-detected workpiece is better met.

Description

Technical Field

[0001] The invention relates to the technical field of nozzle airtightness detection, in particular to a device for nozzle inner surface airtightness detection. Background Art

[0002] There is a nozzle connected to the outlet of the rocket combustion chamber. Metal container products such as the nozzle need to be tested for air tightness during the production process. During the air tightness test, the inner surface of the nozzle needs to be coated with soapy water. An airtight container is installed at the lower end of the nozzle. By inflating the interior of the container, the leakage location can be detected.

[0003] At present, when performing airtightness detection on the inner surface of the nozzle, the method of manually applying soapy water is often adopted. This method is inefficient, and the coverage rate of soapy water and the uniformity of application cannot be guaranteed. At the same time, before the airtightness detection, the nozzle and the airtight container need to be aligned so that the nozzle as a whole is located at the central axis position of the system to facilitate better airtightness testing. Traditional airtightness detection devices have problems such as low operating efficiency of the nozzle workpiece during the airtightness detection process and poor general performance. Therefore, it is very necessary to design a device for airtightness detection of the inner surface of the nozzle. Summary of the invention

[0004] The object of the present invention is to provide a device for detecting the airtightness of the inner profile of a nozzle, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a device for airtight detection of the inner surface of a nozzle, comprising a centering clamping device, an automatic soapy water brushing device and an airtight container body connected to the nozzle body, the nozzle body having an end portion that can be connected to the outlet of the combustion chamber and a gradually expanding portion integrally formed with the end portion, an end of the end portion that is away from the gradually expanding portion is detachably connected to a plugging cover, the end portion on which the plugging cover is installed extends into the airtight container body and is connected to the airtight container body through a sealing fit between the outer side of the end portion, the airtight container body is connected to an external inflation device, the centering clamping device comprises a platform with two mutually perpendicular sliding grooves, a slider mechanism for positioning and clamping is provided in the sliding groove, the airtight container body is positioned and clamped on the platform by the slider mechanism, so that the swing center of the nozzle body overlaps with the intersection of the two mutually perpendicular sliding grooves;

[0006] The automatic soapy water brushing device includes an automatic soapy water brushing mechanical arm arranged on the cast iron platform, a position adjustment device arranged on the automatic soapy water brushing mechanical arm, a brushing device connected to the output end of the position adjustment device, and a brush head connected to the output end of the brushing device. The position adjustment device is used to move the brushing device to the swing center of the nozzle body, and the brushing device is used to drive the brush head to move circumferentially along the inner surface of the end and brush soapy water on the inner surface.

[0007] In a further embodiment, the platform is a cast iron platform, the intersection divides the same sliding groove into a positioning area and a clamping area, and the slider mechanism includes a positioning slider structure and a clamping slider structure which are slidably placed in the positioning area and the clamping area respectively.

[0008] In a further embodiment, the sliding groove is a T-slot, and the clamping slider structure includes a slider slidably placed in the T-slot, the T-slot is provided with a plurality of locking holes, the slider is provided with a T-slot bolt matching the locking holes, the slider is provided with a clamping block, the clamping block is provided with a through T-slot from top to bottom, a push nut is provided in the through T-slot, a hexagonal head bolt is provided on one side of the clamping block on the slider, one end of the hexagonal head bolt passes through the slider and the clamping block in turn and is connected to the push nut, and the other end of the hexagonal head bolt and the T-slot bolt are both threadedly connected with a clamping nut.

[0009] In a further embodiment, the positioning slider structure includes a positioning block slidably placed in the T-slot, the positioning block is provided with a positioning bolt matched with the locking hole, and the positioning bolt is threadedly connected with a positioning nut.

[0010] In a further embodiment, the position adjustment device includes an adjusting motor connected to the cast iron platform through a positioning seat, the output end of the adjusting motor is connected to the automatic soapy water brushing robot arm, the automatic soapy water brushing robot arm is provided with a transverse movement mechanism, and a vertical movement mechanism is provided at the output end of the transverse movement mechanism, and the brushing device is connected to the output end of the vertical movement mechanism.

[0011] In a further embodiment, the transverse movement mechanism includes a transverse movement cylinder arranged on the upper part of the automatic soapy water painting robot arm, and the vertical movement mechanism includes a vertical plate connected to the output end of the transverse movement cylinder, and a vertical movement cylinder is arranged on the vertical plate, and the output end of the vertical movement cylinder is connected to the connecting plate.

[0012] In a further embodiment, the brushing device comprises a rotating motor disposed at the bottom of the connecting plate, the output end of the rotating motor is connected to a first connecting handle, one end of the first connecting handle is mounted with a second connecting handle via a first adjusting bolt, one end of the second connecting handle is mounted with a telescopic rod via a second adjusting bolt, and the brush head is fixed to the end of the telescopic rod;

[0013] The connecting plate is provided with a liquid supply pipeline connected with the brush head, the liquid supply pipeline is provided with a liquid supply pump, and the liquid inlet end of the liquid supply pipeline is connected with a soap water storage box arranged on the connecting plate.

[0014] In a further embodiment, an exhaust port is provided on the top of the airtight container body, a sealing ring is provided on the inner wall of the exhaust port and is tightly attached to the outer side of the end portion, and screws are provided on the outer periphery of the exhaust port on the airtight container body for connecting the end portion.

[0015] In a further embodiment, both ends of the sliding groove are provided with stoppers, the stoppers are provided with tightening holes, and tightening bolts matching the sliding groove are provided in the tightening holes.

[0016] In a further embodiment, a plurality of circular holes are provided on the cast iron platform, load-bearing universal balls are placed in the circular holes, and a scale is provided on one side of the sliding groove located in the positioning area.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are: the airtight container body is positioned and clamped on the platform through the slider mechanism, so that the swing center of the nozzle body overlaps with the intersection of two mutually perpendicular sliding grooves, preventing it from positional displacement during the airtight detection process, and the brushing device is moved to the swing center of the nozzle body through the position adjustment device, and the brush head is driven by the brushing device to move circumferentially along the inner surface of the end and apply soapy water to the inner surface. The soapy water is evenly applied to the inner surface, which facilitates the identification of defects, cracks and leaks on the nozzle body, thereby completing the airtight detection, effectively ensuring the quality and operating efficiency of the airtight detection, improving the general performance of the airtight detection, and better meeting the airtight detection requirements of the workpiece to be inspected. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 is a top view of the centering clamping device of the present invention;

[0020] Figure 3 is a cross-sectional view of the structure of the clamping slider of the present invention;

[0021] Figure 4 It is a schematic diagram of the brush head installation structure of the present invention;

[0022] The accompanying drawings are marked as: nozzle body 1, airtight container body 2, centering clamping device 3, soapy water automatic brushing robot arm 4, cast iron platform 5, positioning slider structure 6, clamping slider structure 7, clamping block 7-1, slider 7-2, pushing nut 7-3, hexagon head bolt 7-4, clamping nut 7-5, T-slot bolt 7-6, load-bearing universal ball 8, ruler 9, stopper 10, positioning seat 11, plug cover 12, brush head 13. DETAILED DESCRIPTION

[0023] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0024] See also Figure 1-Figure 4 The present invention provides a technical solution: a device for detecting the airtightness of the inner surface of a nozzle, comprising a centering clamping device 3, an automatic soapy water brushing device and an airtight container body 2 connected to the nozzle body 1, the nozzle body 1 having an end portion that can be connected to the outlet of the combustion chamber and a gradually expanding portion integrally formed with the end portion, an end of the end portion that is away from the gradually expanding portion is detachably connected to a plugging cover 12, the end portion with the plugging cover 12 installed extends into the airtight container body 2 and is connected to the airtight container body 2 through a sealing fit between the outer side of the end portion, the airtight container body 2 is connected to an external inflation device, the centering clamping device 3 comprises a platform with two mutually perpendicular sliding grooves, a slider mechanism for positioning and clamping is provided in the sliding groove, the airtight container body 2 is positioned and clamped on the platform by the slider mechanism, so that the swing center of the nozzle body 1 overlaps with the intersection of the two mutually perpendicular sliding grooves, specifically, the projection of the swing center of the nozzle body 1 in the vertical direction overlaps with the intersection of the two mutually perpendicular sliding grooves;

[0025] The automatic soapy water brushing device includes an automatic soapy water brushing robot arm 4 arranged on a cast iron platform 5, a position adjustment device arranged on the automatic soapy water brushing robot arm 4, a brushing device connected to the output end of the position adjustment device, and a brush head 13 connected to the output end of the brushing device. The position adjustment device is used to move the brushing device to the swing center of the nozzle body 1, and the brushing device is used to drive the brush head 13 to move circumferentially along the inner surface of the end and brush soapy water on the inner surface.

[0026] Through the above technical solution, during the airtightness detection process, the airtight container body 2 connected to the nozzle body 1 is placed on the platform, and the airtight container body 2 is positioned and clamped on the platform through the slider mechanism, so that the swing center of the nozzle body 1 overlaps with the intersection of the two mutually perpendicular sliding grooves to prevent it from positionally shifting during the airtightness detection process. After the positioning and clamping are completed, the airtight container body 2 is inflated by an external inflation device, and then the brushing device is moved to the swing center of the nozzle body 1 through the position adjustment device, and the brush is driven by the brushing device. The head 13 moves circumferentially along the inner surface of the end portion and applies soapy water to the inner surface. The soapy water is evenly applied to the inner surface. If the nozzle body 1 has defects, cracks, leaks, etc., the gas in the airtight container body 2 will leak, and the inner surface of the nozzle body 1 will be acted upon by the gas and soapy water to produce bubbles. The defects, cracks, leaks, etc. on the nozzle body 1 can be identified, thereby completing the airtight detection, effectively ensuring the quality and operating efficiency of the airtight detection, improving the general performance of the airtight detection, and better meeting the airtight detection requirements of the workpiece to be inspected.

[0027] In a further embodiment, the platform is a cast iron platform 5, the intersection divides the same sliding groove into a positioning area and a clamping area, and the slider mechanism includes a positioning slider structure 6 and a clamping slider structure 7 which are slidably placed in the positioning area and the clamping area respectively.

[0028] In a further embodiment, the sliding groove is a T-slot, and the clamping slider structure 7 includes a slider 7-2 slidably placed in the T-slot, a plurality of locking holes are opened on the T-slot, and a T-slot bolt 7-6 matching the locking holes is provided on the slider 7-2, and a clamping block 7-1 is provided on the slider 7-2, and a through T-slot is opened from top to bottom on the clamping block 7-1, and a push nut 7-3 is provided in the through T-slot, and a hexagonal head bolt 7-4 is provided on the slider 7-2 on one side of the clamping block 7-1, and one end of the hexagonal head bolt 7-4 passes through the slider 7-2 and the clamping block 7-1 in turn and is connected to the push nut 7-3, and a clamping nut 7-5 is threadedly connected to the other end of the hexagonal head bolt 7-4 and the T-slot bolt 7-6.

[0029] Through the above technical scheme, in the process of clamping the airtight container body 2, the slider 7-2 is first adjusted into position so that the clamping block 7-1 is tightly attached to the outer wall of the airtight container body 2, and then the clamping nut 7-5 on the T-slot bolt 7-6 is tightened to fix the slider 7-2, and then the hexagonal head bolt 7-4 is tightened so that the clamping block 7-1 further presses the outer wall of the airtight container body 2. After ensuring the clamping, the clamping nut 7-5 on the hexagonal head bolt 7-4 is finally tightened to lock the hexagonal head bolt 7-4. The clamping operation of the airtight container body 2 is completed, so that after locking the positioning slider structure 6, the clamping slider structure 7 is further fine-tuned to eliminate the small gap between the clamping slider structure 7 and the airtight container body 2 to ensure that the airtight container body 2 is clamped.

[0030] In a further embodiment, the positioning slider structure 6 includes a positioning block slidably placed in the T-slot, the positioning block is provided with a positioning bolt matched with the locking hole, and the positioning bolt is threadedly connected with a positioning nut.

[0031] Through the above technical solution, according to the diameter of the airtight container body 2, the positioning block is first positioned along the scale 9 to find the positioning point. The scale value where the front end of the positioning block is aligned with the scale 9 is consistent with the radius of the airtight container body 2, so that the positioning block is tightly attached to the outer wall surface of the airtight container body 2, and then the positioning nut on the positioning bolt is tightened to fix the positioning block.

[0032] In a further embodiment, the position adjustment device includes an adjusting motor connected to the cast iron platform 5 through a positioning seat 11, the output end of the adjusting motor is connected to the automatic soapy water brushing robot arm 4, the automatic soapy water brushing robot arm 4 is provided with a transverse movement mechanism, and a vertical movement mechanism is provided at the output end of the transverse movement mechanism, and the brushing device is connected to the output end of the vertical movement mechanism.

[0033] Through the above technical scheme, the soapy water automatic brushing robot arm 4 is driven to rotate by adjusting the motor, and then the position of the transverse movement mechanism is adjusted, and the position of the vertical movement mechanism is adjusted by the transverse movement mechanism, so that the brushing device is located directly above the swing center of the nozzle body 1, and the brushing device is moved to the end of the nozzle body 1 through the vertical movement mechanism.

[0034] In a further embodiment, the transverse movement mechanism includes a transverse movement cylinder arranged on the upper part of the automatic soapy water painting robot arm 4, and the vertical movement mechanism includes a vertical plate connected to the output end of the transverse movement cylinder, and a vertical movement cylinder is arranged on the vertical plate, and the output end of the vertical movement cylinder is connected to the connecting plate.

[0035] Through the above technical solution, the position of the vertical plate is adjusted by the transverse cylinder, and the height of the connecting plate is adjusted by the vertical cylinder, thereby adjusting the height of the painting device.

[0036] In a further embodiment, the brushing device includes a rotating motor disposed at the bottom of the connecting plate, the output end of the rotating motor is connected to the first connecting handle, one end of the first connecting handle is mounted with the second connecting handle via a first adjusting bolt, one end of the second connecting handle is mounted with a telescopic rod via a second adjusting bolt, and the brush head 13 is fixed to the end of the telescopic rod;

[0037] A liquid supply pipeline connected to the brush head 13 is arranged on the connecting plate, a liquid supply pump is arranged on the liquid supply pipeline, and a liquid inlet end of the liquid supply pipeline is connected to a soap water storage box arranged on the connecting plate.

[0038] Through the above technical scheme, the first connecting handle is driven to rotate by the rotating motor, and then the brush head 13 is driven to rotate, so that the brush head 13 moves circumferentially along the inner surface of the end portion, and the angle of the second connecting handle is conveniently adjusted by the first adjusting bolt, and the angle of the telescopic rod is conveniently adjusted by the second adjusting bolt. The position of the brush head 13 is conveniently adjusted by the telescopic rod, so that the brush head 13 fits with the inner surface of the end portion, and the soapy water in the soapy water storage box is transported to the brush head 13 through the liquid supply pipe and cooperated with the liquid supply pump through the liquid supply pipe and sprayed out.

[0039] In a further embodiment, an exhaust port is opened on the top of the airtight container body 2, a sealing ring is provided on the inner wall of the exhaust port on the airtight container body 2 and is tightly attached to the outer side of the end, and screws are provided on the outer periphery of the exhaust port on the airtight container body 2 for connecting the end.

[0040] Through the above technical solution, the screws cooperate with the sealing ring, so that the end of the nozzle body 1 is stably connected to the airtight container body 2, and the subsequent airtightness detection is convenient.

[0041] In a further embodiment, stoppers 10 are provided at both ends of the sliding groove, and tightening holes are provided on the stoppers 10, and tightening bolts matching the sliding groove are provided in the tightening holes.

[0042] Through the above technical solution, the positioning block and the slider 7-2 are limited by the stopper 10 to prevent them from being separated from the cast iron platform 5, wherein the length of the stopper 10 is greater than the width of the T-slot notch.

[0043] In a further embodiment, a plurality of circular holes are provided on the cast iron platform 5, and a load-bearing universal ball 8 is placed in the circular hole, and a scale 9 is provided on one side of the sliding groove located in the positioning area.

[0044] Through the above technical scheme, load-bearing universal balls 8 are used as the bottom support of the airtight container body 2, and are arranged evenly so that the airtight container body 2 is evenly stressed, and the sliding friction generated during the movement of the airtight container body 2 is converted into rolling friction, and the friction resistance is reduced to improve the working efficiency. The positioning center point of the cast iron platform 5 is taken as the center of the circle, and 5 load-bearing universal balls 8 are arranged within the minimum diameter of the cast iron platform 5, and 30 load-bearing universal balls 8 are arranged within the maximum diameter range of the cast iron platform 5. The setting of the ruler 9 facilitates centering, and the ruler 9 has a length of 1m and an accuracy of 1mm.

[0045] Working principle: During the airtightness test, the airtight container body 2 connected to the nozzle body 1 is placed on the cast iron platform 5. According to the diameter of the airtight container body 2, the positioning block is first positioned along the scale 9 to find the positioning point. The scale value where the front end of the positioning block is aligned with the scale 9 is consistent with the radius of the airtight container body 2, so that the positioning block is tightly attached to the outer wall of the airtight container body 2, and then the positioning nut on the positioning bolt is tightened to fix the positioning block, and then the slider 7-2 is adjusted into place so that the clamping block 7-1 is aligned with the outer wall of the airtight container body 2. The surface is close to each other, and then the clamping nut 7-5 on the T-slot bolt 7-6 is tightened to fix the slider 7-2, and then the hexagonal bolt 7-4 is tightened to make the clamping block 7-1 further press the outer wall surface of the airtight container body 2. After ensuring the compression, finally tighten the clamping nut 7-5 on the hexagonal bolt 7-4 to lock the hexagonal bolt 7-4. The clamping operation of the airtight container body 2 is completed, so that the swing center of the nozzle body 1 overlaps with the intersection of the two mutually perpendicular sliding grooves to prevent it from shifting in position during the airtight detection process. The positioning clamping is completed. After that, the airtight container body 2 is inflated by an external inflation device, and then the soapy water automatic brushing robot arm 4 is driven to rotate by adjusting the motor, and then the position of the transverse movement mechanism is adjusted, and the position of the vertical movement mechanism is adjusted by the transverse movement mechanism, so that the brushing device is located just above the swing center of the nozzle body 1, and the brush head 13 is moved into the end of the nozzle body 1 by the vertical movement mechanism and driven to move circumferentially along the inner surface of the end, and the angle of the second connecting handle is conveniently adjusted by the first adjusting bolt, and the angle of the telescopic rod is conveniently adjusted by the second adjusting bolt, and the angle of the telescopic rod is conveniently adjusted by the telescopic rod. The position of the brush head 13 is adjusted so that the brush head 13 fits with the inner surface of the end, and soapy water is evenly applied to the inner surface. If the nozzle body 1 has defects, cracks, leaks, etc., the gas in the airtight container body 2 will leak, and the inner surface of the nozzle body 1 will be acted upon by the gas and soapy water to produce bubbles. The defects, cracks, leaks, etc. on the nozzle body 1 can be identified, thereby completing the airtight detection, effectively ensuring the quality and operating efficiency of the airtight detection, improving the general performance of the airtight detection, and better meeting the airtight detection needs of the workpiece to be inspected.

[0046] The preferred specific embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above specific embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A device for detecting the airtightness of the inner surface of a nozzle, characterized in that: It comprises a centering clamping device (3), an automatic soapy water brushing device and an airtight container body (2) connected to a nozzle body (1), wherein the nozzle body (1) has an end portion that can be connected to a combustion chamber outlet and a gradually expanding portion that is integrally formed with the end portion, and an end of the end portion that is away from the gradually expanding portion is detachably connected to a plugging cover (12), and the end portion on which the plugging cover (12) is installed extends into the airtight container body (2) and is connected to the airtight container body (2) through a sealing fit between the outer side of the end portion, and the airtight container body (2) is connected to an external inflation device, and the centering clamping device (3) comprises a platform with two mutually perpendicular sliding grooves, and a slider mechanism for positioning and clamping is provided in the sliding groove, and the airtight container body (2) is positioned and clamped on the platform by the slider mechanism, so that the swing center of the nozzle body (1) overlaps with the intersection of the two mutually perpendicular sliding grooves; The automatic soapy water brushing device comprises an automatic soapy water brushing mechanical arm (4) arranged on the cast iron platform (5), a position adjustment device arranged on the automatic soapy water brushing mechanical arm (4), a brushing device connected to the output end of the position adjustment device, and a brush head (13) connected to the output end of the brushing device, wherein the position adjustment device is used to move the brushing device to the swing center of the nozzle body (1), and the brushing device is used to drive the brush head (13) to move circumferentially along the inner surface of the end and brush soapy water on the inner surface.

2. The device for detecting airtightness of the inner surface of a nozzle according to claim 1, characterized in that: The platform is a cast iron platform (5), the intersection divides the same sliding groove into a positioning area and a clamping area, and the slider mechanism comprises a positioning slider structure (6) and a clamping slider structure (7) which are slidably placed in the positioning area and the clamping area respectively.

3. The device for detecting airtightness of the inner surface of a nozzle according to claim 2, characterized in that: The sliding groove is a T-shaped groove, and the clamping slider structure (7) includes a slider (7-2) slidably placed in the T-shaped groove, the T-shaped groove is provided with a plurality of locking holes, the slider (7-2) is provided with a T-shaped groove bolt (7-6) matched with the locking holes, the slider (7-2) is provided with a clamping block (7-1), the clamping block (7-1) is provided with a through T groove from top to bottom, and a driving nut (7-3) is provided in the through T groove, the slider (7-2) is provided with a hexagonal head bolt (7-4) located on one side of the clamping block (7-1), one end of the hexagonal head bolt (7-4) passes through the slider (7-2) and the clamping block (7-1) in turn and is connected to the driving nut (7-3), and the other end of the hexagonal head bolt (7-4) and the T-shaped groove bolt (7-6) are both threadedly connected with a clamping nut (7-5).

4. The device for detecting airtightness of the inner surface of a nozzle according to claim 3, characterized in that: The positioning slide block structure (6) comprises a positioning block slidably placed in the T-shaped slot, the positioning block is provided with a positioning bolt matched with the locking hole, and the positioning bolt is threadedly connected with a positioning nut.

5. The device for detecting airtightness of the inner surface of a nozzle according to claim 3, characterized in that: The position adjustment device comprises an adjustment motor connected to the cast iron platform (5) via a positioning seat (11); the output end of the adjustment motor is connected to the automatic soapy water brushing robot arm (4); a transverse movement mechanism is provided on the automatic soapy water brushing robot arm (4); a vertical movement mechanism is provided at the output end of the transverse movement mechanism; and the brushing device is connected to the output end of the vertical movement mechanism.

6. The device for detecting airtightness of the inner surface of a nozzle according to claim 5, characterized in that: The transverse movement mechanism comprises a transverse movement cylinder arranged on the upper part of the automatic soapy water painting robot arm (4), and the vertical movement mechanism comprises a vertical plate connected to the output end of the transverse movement cylinder, a vertical movement cylinder is arranged on the vertical plate, and the output end of the vertical movement cylinder is connected to the connecting plate.

7. The device for detecting airtightness of the inner surface of a nozzle according to claim 6, characterized in that: The brushing device comprises a rotating motor arranged at the bottom of the connecting plate, the output end of the rotating motor is connected to a first connecting handle, one end of the first connecting handle is mounted with a second connecting handle via a first adjusting bolt, one end of the second connecting handle is mounted with a telescopic rod via a second adjusting bolt, and the brush head (13) is fixed to the end of the telescopic rod; The connecting plate is provided with a liquid supply pipeline connected to the brush head (13), the liquid supply pipeline is provided with a liquid supply pump, and the liquid inlet end of the liquid supply pipeline is connected to a soap water storage box provided on the connecting plate.

8. The device for detecting airtightness of the inner surface of a nozzle according to claim 3, characterized in that: An exhaust port is provided at the top of the airtight container body (2); a sealing ring is provided on the inner wall of the exhaust port on the airtight container body (2) and is tightly attached to the outer side of the end; and screws for connecting the end are provided on the outer periphery of the exhaust port on the airtight container body (2).

9. The device for detecting airtightness of the inner surface of a nozzle according to claim 1, characterized in that: Stoppers (10) are provided at both ends of the sliding groove, and tightening holes are provided on the stoppers (10), and tightening bolts matching the sliding groove are provided in the tightening holes.

10. The device for detecting airtightness of the inner surface of a nozzle according to claim 2, characterized in that: The cast iron platform (5) is provided with a plurality of circular holes, in which a load-bearing universal ball (8) is placed, and a scale (9) is provided on one side of the sliding groove located in the positioning area.

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