Penetrating agent applying device

By designing the application components of the penetrant application device, the problems of penetrant flow control and scale observation are solved, and the precise control and uniform coating of penetrant flow are achieved to adapt to multi-angle detection.

CN223091848UActive Publication Date: 2025-07-11OFFSHORE OIL ENG CO LTD
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Patent Information

Application Number
CN202422112538.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-29
Publication Date
2025-07-11
Estimated Expiration
2034-08-29

AI Technical Summary

Technical Problem

The existing penetrant application device cannot control the penetrant flow rate, resulting in too much or too little penetrant at the detection position and the scale cannot be accurately observed.

Method used

A penetrant application device is designed to control the penetrant flow rate through the sliding of the application component, including components such as sealing plugs, connecting rods, limiting blocks and rotating rods, so as to achieve precise control of the penetrant flow rate and observe the margin through the scale.

Benefits of technology

The controllability and uniform coating of the permeate flow rate are achieved, adapted to the detection conditions of various angles, and the residual amount of permeate can be accurately observed.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a penetrant applying device, which belongs to the technical field of penetrant applying equipment and comprises a bottle body, an inner cavity is arranged in the bottle body, a first opening is arranged in the first direction of the inner cavity, the bottle body is communicated with the outside through the first opening, and a penetration component is arranged on the first opening of the inner cavity. The penetrating agent in the bottle body is applied to the detection position through the penetrating assembly, an applying assembly is arranged in the inner cavity and can slide relative to the inner cavity, and the flow of the penetrating agent is controlled through sliding of the applying assembly. The opening can adapt to various angles without depending on the gravity of the penetrant, the penetrant can be pushed through the applying assembly, more detection working conditions can be adapted, and when the penetrant is pushed through the applying assembly, the residual amount of the penetrant can be observed through the scales, so that the flow of the penetrant can be obtained.
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Description

Technical Field

[0001] The utility model belongs to the technical field of penetrant application equipment, and particularly relates to a penetrant application device. Background Art

[0002] At present, for the penetrant testing of equipment welds in the fields of ocean engineering and special equipment industries, spray cans of penetrant are usually used. The application method of this pressure spraying is difficult to control the force when pressing the nozzle, and the amount of penetrant wasted during use is relatively large. The aerosol added in the spray can has a pungent smell and is flammable. Especially in a confined space or a place with poor ventilation, the fog-like penetrant diffused in the surrounding air can cause people to have symptoms such as retching and fainting when its content is too high, which is harmful to the health of the testing personnel.

[0003] The existing patent discloses a penetrant application device, including a bottle body. The bottle body has a first inner cavity and a first opening is provided at the first end to communicate the first inner cavity with the outside; a penetration component, the penetration component is clamped in the first opening, and the penetration component communicates the first inner cavity with the outside through a plurality of through holes formed therein; a cover body, the cover body is covered on the first end of the bottle body.

[0004] However, the above patent cannot control the flow rate of the penetrant and can only rely on the gravity flow of the penetrant itself. Therefore, when detecting the detection position, the amount of penetrant may be too much or too little. For example, when controlling the flow rate of the penetrant by squeezing the bottle body, the bottle body may be deformed, the scale cannot be observed, and the scale value is not accurate.

[0005] Therefore, it is urgent to design a penetrant application device to solve the above-mentioned problems. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a penetrant application device, which has the advantage of being able to control the flow rate of the penetrant and solves the problems mentioned in the background art.

[0007] To achieve the above purpose, the specific technical solution of a penetrant application device of the utility model is as follows:

[0008] A penetrant application device includes a bottle body. An inner cavity is provided inside the bottle body. A first opening is provided in the first direction of the inner cavity. The bottle body communicates with the outside through the first opening. A penetration component is provided on the first opening of the inner cavity. The penetrant in the bottle body is applied to the detection position through the penetration component. An application component is provided in the inner cavity. The application component can slide relative to the inner cavity, so as to control the flow rate of the penetrant by the sliding of the application component.

[0009] Furthermore, the application component includes a sealing plug which fits against the inner cavity. The sealing plug is slidable relative to the inner cavity. A connecting rod is fixedly connected to the sealing plug. The connecting rod penetrates through the bottle body and extends outside the bottle body. A push block is fixedly connected to the connecting rod.

[0010] Furthermore, ratchet teeth are provided on the connecting rod, and a limiting block is arranged in the inner cavity. The limiting block is reciprocally swingable relative to the inner cavity. The limiting block meshes with the ratchet teeth on the connecting rod. When the connecting rod slides in the direction close to the first opening, the limiting block swings reciprocally. When the connecting rod slides in the direction away from the first opening, the limiting block engages with the ratchet teeth on the connecting rod to lock the connecting rod.

[0011] Furthermore, a supporting block is fixedly connected to the inner cavity. A rotating rod is rotatably connected to the supporting block. The rotating rod is fixedly connected to the limiting block. The limiting block reciprocally swings relative to the inner cavity with the rotating rod as the center.

[0012] Furthermore, a torsion spring is sleeved on the rotating rod. Two ends of the torsion spring are respectively fixedly connected to the limiting block and the supporting block.

[0013] Furthermore, a sliding rod is sleeved on the rotating rod. The sliding rod is slidable relative to the rotating rod. A co-rotating component is arranged on the sliding rod and the rotating rod to enable the sliding rod and the rotating rod to rotate together or stop rotating together. One end of the sliding rod away from the rotating rod extends outside the bottle body. A clamping component is arranged on the sliding rod and the inner cavity to control whether the limiting block can swing relative to the inner cavity through the sliding position of the sliding rod.

[0014] Furthermore, the co-rotating component includes a spline and a key groove. The spline is fixedly connected to the rotating rod. A sliding groove is formed in the sliding rod. The sliding rod is slidably connected to the rotating rod through the sliding groove. The key groove communicates with the sliding groove. The spline is slidably connected to the key groove.

[0015] Furthermore, the clamping component includes a clamping block fixedly connected to the sliding rod. A limiting groove is arranged on the inner cavity. The clamping block can be clamped with the limiting groove. When the clamping block is clamped with the limiting groove, the sliding rod and the rotating rod stop rotating together, and the limiting block stops swinging. When the clamping block is not clamped with the limiting groove, the sliding rod and the rotating rod can rotate together, and the limiting block can swing relative to the inner cavity.

[0016] Furthermore, a partition is fixedly connected to the inner cavity. The inner cavity is divided into a first chamber and a second chamber by the partition. The first opening is arranged at one end of the first chamber away from the second chamber. The sealing plug is located in the first chamber.

[0017] Furthermore, a corrugated bottleneck is arranged between the bottle body and the permeation component. The corrugated bottleneck can undergo elastic deformation through its corrugated structure.

[0018] The utility model has the following advantages: The opening of the utility model can adapt to various angles, without relying on the gravity of the penetrant. The penetrant can be pushed by the applying component, adapting to more detection working conditions. When the penetrant is pushed by the applying component, the remaining amount of the penetrant can be observed through the scale, so as to obtain the flow rate of the penetrant. Description of the Drawings

[0019] Figure 1 is the overall structural schematic diagram of the penetrant applying device of the utility model;

[0020] Figure 2 is the sectional structural schematic diagram of the penetrant applying device of the utility model;

[0021] Figure 3 is the structural schematic diagram of the applying component of the utility model;

[0022] Figure 4 is the structural schematic diagram of the clamping component of the utility model;

[0023] Figure 5 is the structural schematic diagram of the check component of the utility model;

[0024] Figure 6 is the exploded structural schematic diagram of the penetrant component of the utility model;

[0025] Figure 7 is the structural schematic diagram of the main body of the utility model;

[0026] Figure 8 is the structural schematic diagram of the sponge body of the utility model;

[0027] Figure 9 is the structural schematic diagram of the top plug of the utility model;

[0028] Figure 10 is the structural schematic diagram of the cover body of the utility model;

[0029] Figure 11 is the upward view structural schematic diagram of the cover body of the utility model.

[0030] Description of the markings in the figure: 1. Bottle body; 11. First cavity; 12. Second cavity; 13. Partition board; 14. Scale; 15. Limit groove; 2. Connecting rod; 21. Ratchet teeth; 22. Hand push block; 23. Sealing plug; 3. Limit block; 31. Support block; 32. Rotating rod; 33. Torsion spring; 34. Sliding rod; 35. Clamping block; 36. Keyway; 37. Spline; 4. Penetration component; 41. Body; 411. Perforation; 412. Groove; 42. Sponge body; 43. Elastic sealing member; 431. Fixed ring; 432. S-shaped support member; 433. Top plug; 434. Card slot; 5. Cover body; 51. Installation bin; 52. Temperature measurement port; 6. Corrugated bottleneck; 7. Bottleneck fixing sleeve. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0032] Those skilled in the art can understand that although some embodiments herein include some features included in other embodiments but not other features, the combination of the features of different embodiments means that it is within the scope of the present utility model and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0033] Next, refer to the attached Figure 1 to the attached Figure 11 to describe a penetrant application device of the present utility model.

[0034] Existing penetrant application devices cannot control the flow rate of the penetrant and can only rely on the gravity flow of the penetrant itself. Therefore, when detecting a detection position, there may be too much or too little penetrant. For example, if the flow rate of the penetrant is controlled by squeezing the bottle body, the bottle body may be deformed, the scale cannot be observed, and the scale value is not accurate.

[0035] Therefore, this penetrant application device includes a bottle body 1. An inner cavity is provided inside the bottle body 1. A first opening is provided in the first direction of the inner cavity. The bottle body 1 communicates with the outside through the first opening. A penetration component 4 is provided on the first opening of the inner cavity. The penetrant in the bottle body 1 is applied to the detection position through the penetration component 4. An application component is provided in the inner cavity. The application component can slide relative to the inner cavity to control the flow rate of the penetrant by sliding the application component.

[0036] Preferably, the bottle body 1 has a cylindrical outer shape structure; in other embodiments of the present invention, the bottle body 1 can also be set to other corresponding outer shape structures, such as a cube, a frustum of a pyramid, etc.

[0037] Specifically, the inner cavity is used to hold the penetrant, and the first opening is used for the installation of the penetration component 4.

[0038] Moreover, the usage mode of this penetrant application device can be changed. The existing usage modes of penetrant application devices are all with the opening facing downwards, so that the penetrant flows downward by gravity. However, the opening of the present invention can adapt to various angles, without relying on the gravity of the penetrant. The penetrant can be pushed by the application component, adapting to more detection working conditions. And when the penetrant is pushed by the application component, the remaining amount of the penetrant can be observed through the scale 14 to obtain the flow rate of the penetrant.

[0039] Specifically, the application component includes a sealing plug 23. The sealing plug 23 fits with the inner cavity. The sealing plug 23 can slide relative to the inner cavity. A connecting rod 2 is fixedly connected to the sealing plug 23. The connecting rod 2 passes through the bottle body 1 and extends outside the bottle body 1. A hand push block 22 is fixedly connected to the connecting rod 2. By setting the sealing plug 23, the penetrant is pushed to move. When the driving force is large, the flow rate of the penetrant is large. When the driving force is small, the flow rate of the penetrant is small. And since the sealing plug 23 can slide relative to the inner cavity, when the sealing plug 23 pushes the penetrant, there will be no residual penetrant left in the part where the sealing plug 23 slides.

[0040] Preferably, ratchet teeth 21 are provided on the connecting rod 2, and a limiting block 3 is arranged in the inner cavity. The limiting block 3 can swing reciprocally relative to the inner cavity. The limiting block 3 meshes with the ratchet teeth 21 on the connecting rod 2. When the connecting rod 2 slides in the direction close to the first opening, the limiting block 3 swings reciprocally. When the connecting rod 2 slides in the direction away from the first opening, the limiting block 3 engages with the ratchet teeth 21 on the connecting rod 2 to lock the connecting rod 2, so that the sealing plug 23 can only slide in the direction of the first opening and cannot retreat. Thus, there will be no gas left in the cavity of the sealing plug 23 facing the first opening end, so that when applying the penetrant, the penetrant is evenly coated.

[0041] Specifically, a support block 31 is fixedly connected to the inner cavity. A rotating rod 32 is rotatably connected to the support block 31. The rotating rod 32 is fixedly connected to the limiting block 3. The limiting block 3 swings reciprocally relative to the inner cavity with the rotating rod 32 as the center.

[0042] Preferably, a torsion spring 33 is sleeved on the rotating rod 32. The two ends of the torsion spring 33 are respectively fixedly connected to the limiting block 3 and the support block 31. In other embodiments of the present invention, the limiting block 3 can also automatically reset by its own weight, as long as it can satisfy that the limiting block 3 swings reciprocally relative to the inner cavity with the rotating rod 32 as the center.

[0043] Specifically, a sliding rod 34 is sleeved on the rotating rod 32. The sliding rod 34 can slide relative to the rotating rod 32. A co-rotating assembly is provided on the sliding rod 34 and the rotating rod 32 to make the sliding rod 34 and the rotating rod 32 rotate together or stop rotating together. One end of the sliding rod 34 far from the rotating rod 32 extends outside the bottle body 1. A clamping assembly is provided on the sliding rod 34 and the inner cavity to control whether the limiting block 3 can swing relative to the inner cavity through the sliding position of the sliding rod 34.

[0044] Preferably, the co-rotating assembly includes a spline 37 and a keyway 36. The spline 37 is fixedly connected to the rotating rod 32. A sliding groove is formed on the sliding rod 34. The sliding rod 34 is slidably connected to the rotating rod 32 through the sliding groove. The keyway 36 communicates with the sliding groove. The spline 37 is slidably connected to the keyway 36, so that when the sliding rod 34 rotates, the rotating rod 32 rotates synchronously, and when the sliding rod 34 stops rotating, the rotating rod 32 stops rotating synchronously.

[0045] Specifically, the clamping assembly includes a clamping block 35 fixedly connected to the sliding rod 34. A limiting groove 15 is provided on the inner cavity. The clamping block 35 can be clamped with the limiting groove 15. When the clamping block 35 is clamped with the limiting groove 15, the sliding rod 34 and the rotating rod 32 stop rotating together, and the limiting block 3 stops swinging. When the clamping block 35 is not clamped with the limiting groove 15, the sliding rod 34 and the rotating rod 32 can rotate together, and the limiting block 3 can swing relative to the inner cavity.

[0046] When the application device is not in use, the sliding rod 34 can be pulled outwards to make the clamping block 35 on the sliding rod 34 be clamped with the limiting groove 15, so that the sliding rod 34 and the rotating rod 32 cannot rotate together, and the sealing plug 23 cannot slide, avoiding the loss of penetrant when accidentally touching the sliding rod 34.

[0047] When the application device is in use, the sliding rod 34 is pushed inwards to separate the clamping block 35 on the sliding rod 34 from the limiting groove 15 to cancel the clamping, so that the sliding rod 34 and the rotating rod 32 can rotate together, and the sealing plug 23 can slide towards the first opening, so that there is no gas remaining in the cavity of the sealing plug 23 facing the first opening end, making the penetrant evenly coated when applying the penetrant.

[0048] When the application device is reset, first ensure that the clamping block 35 on the sliding rod 34 is separated from the limiting groove 15, and then rotate the sliding rod 34, so that the rotating rod 32 drives the limiting block 3 to rotate, and the limiting block 3 is separated from the ratchet teeth 21 on the connecting rod 2, so that the sealing plug 23 is pulled in the direction away from the first opening to reset the sealing plug 23.

[0049] Further, a partition 13 is fixedly connected to the inner cavity. The inner cavity is separated by the partition 13 into a first chamber 11 and a second chamber 12. The first opening is provided at one end of the first chamber 11 away from the second chamber 12. The sealing plug 23 is located in the first chamber 11, and the sliding rod 34 is located in the second chamber 12, preventing the outflow of the penetrant.

[0050] Further, a corrugated bottleneck 6 is provided between the bottle body 1 and the penetration assembly 4. The corrugated bottleneck 6 can undergo elastic deformation through its corrugated structure.

[0051] The bottle body 1 includes a bottle body and a bottle mouth portion. The first opening is provided on the bottle mouth portion.

[0052] Among them, the corrugated bottleneck 6 can adjust the angle of the bottle mouth portion through its elastic deformation performance, so as to adjust the angle of the penetration assembly 4, enabling the penetrant in the bottle body to be better applied to different positions.

[0053] Specifically, it further includes a bottleneck fixing sleeve 7. The bottleneck fixing sleeve 7 is provided on the outer side of the bottleneck and the bottle mouth portion. This setting can fix the corrugated bottleneck 6 through the bottleneck fixing sleeve 7, making it unable to adjust the angle of the bottle mouth, and can play a guiding role.

[0054] Specifically, an annular card slot 434 is provided on the end face of the bottle body near the bottleneck. The bottleneck fixing sleeve 7 is clamped in the annular card slot 434. This setting can better fix the bottleneck fixing sleeve 7, enabling it to only rotate and preventing position offset.

[0055] Specifically, a number of elastic fixing bolts are provided at intervals on the peripheral wall of the bottle mouth portion, and fixing holes corresponding to the number of elastic fixing bolts are provided on the fixing sleeve. This setting can fix the bottleneck fixing sleeve 7 through the elastic fixing bolts, making it unable to rotate, and when it is necessary to disassemble the bottleneck fixing sleeve 7, the elastic fixing bolts can be pressed, causing the elastic fixing bolts to retract under the action of their elastic force, facilitating the removal of the bottleneck fixing sleeve 7.

[0056] In this embodiment, the number of elastic fixing bolts is four and they are evenly arranged on the peripheral wall of the bottle mouth portion.

[0057] Specifically, the bottle body 1 is of a transparent structure and a volume scale 14 is provided on the outer wall. A partition 13 is provided in the inner cavity. Among them, the volume scale 14 can facilitate reading the capacity of the penetrant inside, and the partition 13 is provided to prevent the penetrant at the corrugated bottleneck 6 from quickly returning to the bottle body.

[0058] Specifically, the penetration component 4 includes a body 41, a sponge body 42, and an elastic sealing member 43. The body 41 is clamped in the first opening. The body 41 has a second inner cavity and one end is provided with a second opening communicating the second inner cavity with the outside. A groove 412 formed by a depression is provided on the inner wall of the second inner cavity. The sponge body 42 is arranged at the bottom of the second inner cavity. The elastic sealing member 43 is arranged in the second opening and one end presses against the sponge body 42. The elastic sealing member 43 is arranged in the groove 412 corresponding to the groove 412 and can move in the groove 412 under the action of its elastic force. A plurality of through holes 411 are arranged on the side wall of the body 41 corresponding to the sponge body 42.

[0059] Wherein, the number and aperture of the through holes 411 are set according to actual requirements, so as to allow the penetrant to seep out.

[0060] Specifically, the elastic sealing member 43 includes a fixing ring 431 limited and fixed in the second opening, a plurality of S-shaped support members 432 connected to the fixing ring 431, and a top plug 433 connected to the other ends of the plurality of S-shaped support members 432. The periphery of the top plug 433 is arranged in the groove 412 and can move in the groove 412 under the elastic force formed by the S-shaped support members 432. Among them, the top plug 433 presses against the sponge body 42.

[0061] Among them, the body 41 is clamped in the first opening, which can facilitate the installation and disassembly of the penetration component 4. The setting of the sponge body 42 can make the penetrant pass through evenly and discharge from the through holes 411, mainly playing the role of adjusting the application amount of the penetrant. The setting of the sealing member can make the top plug 433 move in the groove 412 under the pressure generated at the end of the body 41 by squeezing the end of the body 41, so that it disengages from the side wall of the groove 412, allowing the penetrant to enter the sponge body 42 through the groove 412. When the end of the body 41 is not squeezed, the top plug 433 will rebound under the elastic force of the S-shaped support members 432 to block the groove 412, preventing the penetrant from entering the sponge body 42 through the groove 412.

[0062] Specifically, a clamping groove 434 is provided on the periphery of the fixing ring 431, and a clamping buckle corresponding to the clamping groove 434 is provided on the inner wall of the second opening. The fixing ring 431 is limited and fixed in the second opening through the cooperation of the clamping groove 434 and the clamping buckle. Such a setting can facilitate the installation and disassembly of the elastic sealing member.

[0063] Specifically, the cover body 5 is covered on the first end of the bottle body 1 through a threaded structure, that is, the cover body 5 is covered on the first end of the bottle body through a threaded structure.

[0064] Specifically, it further includes a thermometer. An installation chamber 51 is provided in the cover body 5. A temperature measurement port 52 is provided through the side wall of the installation chamber 51. The thermometer is arranged in the installation chamber 51 and its temperature measurement end extends out of the temperature measurement port 52. Among them, the thermometer is fixed by watering.

[0065] Among them, the setting of the installation bin 51 can facilitate the fixation of the thermometer. The thermometer is used to measure the temperature of the surface of the workpiece to be detected and the penetrant, so as to provide a basis for the penetration time. The design of the temperature measuring port 52 can make the temperature measuring port 52 of the thermometer extend out for easy temperature measurement.

[0066] During installation, first load the penetrant into the inner cavity of the bottle body 1, then load the sponge body 42 and the elastic sealing member 43 into the main body 41, then load the main body 41 into the first opening of the bottle body 1, install the fixing sleeve, finally load the thermometer into the installation bin 51, and then cover the cover body 5 on the first end of the bottle body, and the penetrant application device can be taken to the site for use.

[0067] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations on the implementation modes of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation modes here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A penetrant application device, characterized in that, It includes a bottle body with an inner cavity provided therein. A first opening is provided in the first direction of the inner cavity. The bottle body communicates with the outside through the first opening. A permeation component is provided on the first opening of the inner cavity. The permeating agent in the bottle body is applied to the detection position through the permeation component. An application component is provided in the inner cavity. The application component can slide relative to the inner cavity to control the flow rate of the permeating agent by sliding the application component.

2. The penetrant application device according to claim 1, characterized in that, The application component includes a sealing plug that fits with the inner cavity. The sealing plug can slide relative to the inner cavity. A connecting rod is fixedly connected to the sealing plug. The connecting rod penetrates through the bottle body and extends outside the bottle body. A hand-pushing block is fixedly connected to the connecting rod.

3. The penetrant application device according to claim 2, characterized in that, Ratchet teeth are provided on the connecting rod. A limiting block is provided in the inner cavity. The limiting block can swing reciprocally relative to the inner cavity. The limiting block meshes with the ratchet teeth on the connecting rod. When the connecting rod slides in the direction close to the first opening, the limiting block swings reciprocally. When the connecting rod slides in the direction away from the first opening, the limiting block engages with the ratchet teeth on the connecting rod to lock the connecting rod.

4. The penetrant application device according to claim 3, wherein, A support block is fixedly connected to the inner cavity. A rotating rod is rotatably connected to the support block. The rotating rod is fixedly connected to the limiting block. The limiting block swings reciprocally relative to the inner cavity with the rotating rod as the center.

5. The penetrant application device according to claim 4, characterized in that, A torsion spring is sleeved on the rotating rod. Two ends of the torsion spring are respectively fixedly connected to the limiting block and the support block.

6. The penetrant application device according to claim 4, characterized in that, A sliding rod is sleeved on the rotating rod. The sliding rod can slide relative to the rotating rod. A co-rotating component is provided on the sliding rod and the rotating rod to make the sliding rod and the rotating rod rotate together or stop rotating together. One end of the sliding rod far from the rotating rod extends outside the bottle body. A clamping component is provided on the sliding rod and the inner cavity to control whether the limiting block can swing relative to the inner cavity through the sliding position of the sliding rod.

7. The penetrant application device according to claim 6, wherein The co-rotating component includes a spline and a key groove. The spline is fixedly connected to the rotating rod. A sliding groove is formed on the sliding rod. The sliding rod is slidably connected to the rotating rod through the sliding groove. The key groove communicates with the sliding groove. The spline is slidably connected to the key groove.

8. The penetrant application device according to claim 6, characterized in that, The clamping component includes a block fixedly connected to the sliding rod. A limiting groove is provided on the inner cavity. The block can be clamped with the limiting groove. When the block is clamped with the limiting groove, the sliding rod and the rotating rod stop rotating together, and the limiting block stops swinging. When the block is not clamped with the limiting groove, the sliding rod and the rotating rod can rotate together, and the limiting block can swing relative to the inner cavity.

9. The penetrant application device according to claim 2, wherein A partition is fixedly connected to the inner cavity. The inner cavity is divided into a first chamber and a second chamber by the partition. The first opening is provided at one end of the first chamber far from the second chamber. The sealing plug is located in the first chamber.

10. The penetrant application device according to claim 1, characterized in that, A corrugated bottleneck is provided between the bottle body and the permeation component. The corrugated bottleneck can undergo elastic deformation through its corrugated structure.