Exhaust device

Abstract

The air exhausting device comprises a clamping mechanism and an air exhausting mechanism, the clamping mechanism can fix a cylindrical workpiece, the air exhausting mechanism comprises an air guiding part, a flexible pipe, a buoyancy part and an air exhausting part, the air guiding part is installed on the clamping mechanism and provided with an air guiding channel, one end of the flexible pipe is connected with one end of the air guiding part and communicates with the air guiding channel, and the buoyancy part is connected with the air exhausting part. The buoyancy part is connected with the other end of the flexible pipe, a through hole communicated with the flexible pipe is formed in the buoyancy part, and the air exhaust part is communicated with the other end of the air guide channel and can exhaust air from the air guide channel; when the open end of the cylindrical workpiece moves towards the liquid level, the buoyancy part can suspend on the liquid level and extend into the cylindrical workpiece. The problem that in the prior art, when a cylindrical workpiece is detected in a mode of being inverted in water, the cylindrical workpiece is filled with water as a propagation medium, meanwhile, more gas can be collected in the cylindrical workpiece, and if the gas is not completely emptied, the detection effect of the cylindrical workpiece can be influenced is solved.

Description

Technical Field

[0001] This invention relates to the field of workpiece inspection technology, and specifically to an exhaust device. Background Technology

[0002] When inspecting cylindrical workpieces, it is more suitable to inspect them from the outer wall to avoid significant mechanical interference issues, and water is required as the transmission medium. Therefore, the method of inverting the cylinder opening is usually used for quality inspection.

[0003] During the testing process, a fixing mechanism is needed to secure the cylindrical workpiece. A lifting mechanism drives the fixing mechanism to descend, causing the open end of the cylindrical workpiece to move towards the liquid surface until the cylindrical workpiece sinks into the water, ensuring that the liquid medium fills the internal space of the cylindrical workpiece. However, after the cylindrical workpiece is inverted and submerged in the water, a large amount of gas will be collected inside the cylindrical workpiece. If the gas collected inside the cylindrical workpiece is not completely discharged, it will affect the testing effect of the testing equipment on the cylindrical workpiece. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide an exhaust device that solves the problem in the prior art where, when a cylindrical workpiece is placed upside down in water for testing, water serves as a transmission medium and fills the cylindrical workpiece, while a large amount of gas is also collected inside the cylindrical workpiece. If the gas is not completely vented, it will affect the testing effect of the cylindrical workpiece.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: This invention provides an exhaust device, comprising: A clamping mechanism capable of fixing a cylindrical workpiece; An air extraction mechanism includes an air guide, a flexible tube, a buoyancy part, and an air extraction component. The air guide is mounted on a clamping mechanism and has an air guide channel. One end of the flexible tube is connected to one end of the air guide and communicates with the air guide channel. The buoyancy part is connected to the other end of the flexible tube and has a through hole communicating with the flexible tube. The air extraction component is connected to the other end of the air guide channel and can extract air from the air guide channel. When the open end of the cylindrical workpiece moves toward the liquid surface, the buoyancy part can suspend on the liquid surface and extend into the cylindrical workpiece. In one embodiment, the air extraction mechanism further includes an elastic element that is sleeved on the flexible tube.

[0006] In one embodiment, the buoyancy part includes a buoyancy block and a protrusion. The protrusion is disposed on the buoyancy block. The buoyancy block is connected to the other end of the flexible tube. The through hole passes through the protrusion and the buoyancy block. The protrusion is also provided with a plurality of grooves, all of which are connected to the through hole.

[0007] In one embodiment, the clamping mechanism includes a platform and at least two clamping members, the at least two clamping members being mounted on the platform, and an adjustable clamping space being formed between the two clamping members.

[0008] In one embodiment, the clamping member includes an adjusting screw and a limiting part. The adjusting screw is rotatably mounted on the platform, the limiting part is slidably connected to the platform and threadedly connected to the adjusting screw, and the top of the limiting part has a supporting platform and a limiting protrusion.

[0009] In one embodiment, the limiting protrusion is generally arc-shaped, and a gasket is provided on the surface of the limiting protrusion that abuts against the cylindrical workpiece.

[0010] In one embodiment, a rotating mechanism is further included, the rotating mechanism comprising a base and a drive member, the base being rotatably connected to the platform, the drive member being mounted on the base and capable of driving the platform to rotate, and the air guide being rotatably connected to the center of the platform and fixedly connected to the base.

[0011] In one embodiment, the platform has a mounting hole at its center, one end of each of the adjusting screws extends into the mounting hole and is rotatably connected to the driving bevel gear, the air guide is inserted into the mounting hole, and a driven bevel gear that meshes with each of the driving bevel gears is fixed on the air guide.

[0012] In one embodiment, the air guide includes an air guide pipe, a first rotary joint, a second rotary joint, and an exhaust pipe. The air guide pipe is rotatably connected to the platform body, and the driven bevel gear is fixed on the air guide pipe. The fixed end of the first rotary joint is connected to one end of the air guide pipe, and the movable end of the first rotary joint is connected to one end of the flexible tube. The fixed end of the second rotary joint is fixedly connected to the other end of the air guide pipe. One end of the exhaust pipe is connected to the movable end of the second rotary joint, and the exhaust pipe is also fixedly connected to the base. The other end of the exhaust pipe is connected to the air extraction component.

[0013] In one embodiment, the driving component includes a geared motor, a transmission belt, and a drive pulley. The geared motor is mounted on the base, and its output end is fixedly connected to the drive pulley. A driven pulley is fixedly mounted on the platform, and the transmission belt connects the drive pulley and the driven pulley.

[0014] Compared with the prior art, the present invention provides an exhaust device that is installed on a clamping mechanism via an air guide component. The air guide component has an air guide channel, one end of a flexible tube is connected to one end of the air guide component and communicates with the air guide channel, a buoyancy part is connected to the other end of the flexible tube, and the buoyancy part has a through hole that communicates with the flexible tube. An air extraction component is connected to the other end of the air guide channel. When the open end of the cylindrical workpiece moves toward the liquid surface, the buoyancy part can suspend on the liquid surface and extend into the cylindrical workpiece. By extracting air from the air guide channel through the air extraction component, the liquid level inside the cylindrical workpiece will gradually rise, and the buoyancy part will also rise with the rise of the liquid level, ensuring that the through hole on the buoyancy part is always in communication with the gas inside the cylindrical workpiece until the buoyancy part is in contact with the inner wall of the cylindrical workpiece, thus venting the gas inside the cylindrical workpiece. This can improve the ultrasonic testing effect of the cylindrical workpiece. Attached Figure Description

[0015] Figure 1 This is a reference diagram of the use of an exhaust device provided by the present invention; Figure 2 This is a schematic diagram of the structure of an exhaust device provided by the present invention; Figure 3 This is a structural schematic diagram of an exhaust device provided by the present invention from another perspective; Figure 4 This is a schematic diagram of the clamping mechanism provided by the present invention; Figure 5 This is a partial cross-sectional view of an exhaust device provided in an embodiment of the present invention; Figure 6 yes Figure 5 Enlarged view of region B in the middle; Figure 7 This is a schematic diagram of the buoyancy unit provided in an embodiment of the present invention. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0017] To address the technical problem that when testing cylindrical workpieces by immersing them in water, water acts as the transmission medium, filling the workpiece and causing significant gas accumulation inside. Failure to completely vent this gas can negatively impact the testing results. This invention provides an venting device that effectively removes the collected gas from the cylindrical workpiece, improving the testing outcome. Specifically, this solution utilizes ultrasonic testing equipment to perform ultrasonic testing on the cylindrical workpiece.

[0018] Please see Figures 1-7 , Figures 1-7 According to one embodiment of the present invention, an exhaust device includes a clamping mechanism 1 and an exhaust mechanism 2. The clamping mechanism 1 can fix a cylindrical workpiece A. The exhaust mechanism 2 includes an air guide 21, a flexible tube 22, a buoyancy part 23, and an exhaust component 24. The air guide 21 is mounted on the clamping mechanism 1 and has an air guide channel. One end of the flexible tube 22 is connected to one end of the air guide 21 and communicates with the air guide channel. The buoyancy part 23 is connected to the other end of the flexible tube 22 and has a through hole 23a that communicates with the flexible tube 22. The exhaust component 24 is connected to the other end of the air guide channel and can exhaust air from the air guide channel. When the open end of the cylindrical workpiece A moves toward the liquid surface, the buoyancy part 23 can suspend on the liquid surface and extend into the cylindrical workpiece A. In actual use, the cylindrical workpiece is fixed by the clamping mechanism 1, so that the cylindrical workpiece is inverted into the water, and the open end of the cylindrical workpiece is in contact with the liquid surface. The buoyancy part 23 is suspended on the liquid surface and extends into the cylindrical workpiece. The air guide channel is evacuated by the air extraction part 24, which will cause the liquid level in the cylindrical workpiece to rise gradually. The buoyancy part 23 will also rise with the rise of the liquid level, which can always ensure that the through hole 23a on the buoyancy part 23 is connected to the gas inside the cylindrical workpiece A until the buoyancy part 23 is in contact with the inner wall of the cylindrical workpiece A, and the gas inside the cylindrical workpiece A is emptied. Water can then fill the internal space of the cylindrical workpiece A, and the cylindrical workpiece A can be ultrasonically tested by an ultrasonic testing device (not shown in the figure).

[0019] Based on the above scheme, when the buoyancy part 23 comes into contact with the inner wall of the cylindrical workpiece A, it is easy to cause the flexible tube 22 to bend. After the flexible tube 22 bends, it cannot be guaranteed that the through hole 23a on the buoyancy part 23 is connected to the air guide channel, which affects the exhaust effect.

[0020] In one embodiment, the air extraction mechanism 2 further includes an elastic element 25, which is sleeved on the flexible tube 22. It should be noted that the elastic element 25 is a spring, and the spring sleeved on the flexible tube 22 can improve the bending resistance of the flexible tube 22. The flexible tube 22 is a hose.

[0021] It should be noted that, in one embodiment, the clamping mechanism 1 can clamp and fix different cylindrical workpieces A. In order to ensure that the buoyancy part 23 can fit with the inner wall of the cylindrical workpiece A as it rises with the liquid level, specifically, the design length of the flexible tube 22 can meet the venting requirements of various types of cylindrical workpieces A. It is understood that when the type of cylindrical workpiece A is small, after the buoyancy part 23 fits with the inner wall of the cylindrical workpiece A, there will be a bent section of the flexible tube 22 that is submerged in water.

[0022] It should be noted that the buoyancy part 23 should have good buoyancy, that is, the buoyancy of the buoyancy part 23 should be greater than the weight of the flexible tube 22 and the elastic element 25, so as to ensure that the buoyancy part 23 can always float on the liquid surface.

[0023] In one embodiment, the buoyancy part 23 includes a buoyancy block 231 and a protrusion 232. The protrusion 232 is disposed on the buoyancy block 231. The buoyancy block 231 is connected to the other end of the flexible tube 22. The through hole 23a passes through the protrusion 232 and the buoyancy block 231.

[0024] Specifically, the buoyancy block 231 is generally disc-shaped, the protrusion 232 is generally hemispherical, and the protrusion 232 is located at the center of the buoyancy block 231.

[0025] Based on the above solution, in order to avoid the through hole 23a being blocked and resulting in poor exhaust effect when the buoyancy part 23 is in contact with the inner wall of the cylindrical workpiece A, specifically, a plurality of grooves 23b are also provided on the protrusion 232, and the plurality of grooves 23b are all connected to the through hole 23a; it can be understood that when the through hole 23a is blocked, the gas of the cylindrical workpiece A can enter the through hole 23a through the plurality of grooves 23b, which can further improve the exhaust effect.

[0026] It should be noted that, in one embodiment, the clamping mechanism 1 includes a platform 11 and at least two clamping members 12, with at least two clamping members 12 mounted on the platform 11, and an adjustable clamping space formed between the two clamping members 12.

[0027] In this specific embodiment, the platform 11 is generally disc-shaped, and three clamping members 12 are provided on the platform 11. The three clamping members 12 are arranged at intervals along the circumference of the platform 11, that is, the included angle between two adjacent clamping members 12 is the same.

[0028] It should be noted that the clamping member 12 is not limited to a specific structure, as long as it can clamp and fix cylindrical workpieces of different models, no other limitations are made here.

[0029] In one embodiment, the clamping member 12 includes an adjusting screw 121 and a limiting part 122. The adjusting screw 121 is rotatably mounted on the platform 11. The limiting part 122 is slidably connected to the platform 11 and threadedly connected to the adjusting screw 121. The top of the limiting part 122 has a supporting platform 122a and a limiting protrusion 122b.

[0030] It is understood that by rotating the adjusting screw 121 to drive the limiting part 122 to move in the radial direction of the platform 11, the distance between the limiting part 122 and the center of the platform 11 can be adjusted so that the three clamping members 12 can clamp different types of cylindrical workpieces. Specifically, the cylindrical workpiece can be placed on the three support platforms, ensuring that the three limiting protrusions 122b all extend into the interior of the cylindrical workpiece. By rotating the adjusting screw 121 to drive the limiting part 122 to move, the limiting protrusions 122b abut against the inner wall of the open end of the cylindrical workpiece, thus fixing the cylindrical workpiece.

[0031] Based on the above solution, in order to avoid damage to the cylindrical workpiece when fixing it, specifically, the limiting protrusion 122b is arc-shaped as a whole, and the surface of the limiting protrusion 122b that abuts against the cylindrical workpiece is provided with a gasket; wherein, the gasket is an elastic rubber gasket.

[0032] It should be noted that, based on the above scheme, in order to facilitate ultrasonic testing of cylindrical workpieces by ultrasonic testing equipment, a rotating mechanism 3 is specifically included. The rotating mechanism 3 includes a base 31 and a driving component 32. The base 31 is rotatably connected to the platform 11. The driving component 32 is installed on the base 31 and can drive the platform 11 to rotate. The air guide 21 is rotatably connected to the center of the platform 11 and fixedly connected to the base 31.

[0033] It is understandable that the ultrasonic testing equipment can be set on one side of the rotating mechanism 3. When the driving component 32 drives the platform 11 to rotate, it can drive the cylindrical workpiece to rotate, which can ensure that each side of the cylindrical workpiece can correspond to the ultrasonic testing equipment, thereby improving the testing efficiency of the cylindrical workpiece.

[0034] In one embodiment, the drive unit 32 includes a geared motor 321, a transmission belt 322, and a drive pulley 323. The geared motor 321 is mounted on the base 31, and the output end of the geared motor 321 is fixedly connected to the drive pulley 323. A driven pulley 13 is fixedly provided on the platform 11, and the transmission belt 322 is connected between the drive pulley 323 and the driven pulley 13.

[0035] In addition, it should be noted that the base 31 can be connected to a lifting mechanism (not shown in the figure). The lifting mechanism can drive the base 31 to rise or fall, so as to immerse the cylindrical workpiece in water or remove it from the water.

[0036] It should be noted that, based on the above scheme, the platform 11 has a mounting hole 11a at its center, one end of each of the adjusting screws 121 extends into the mounting hole 11a and is rotatably connected to the driving bevel gear 123, the air guide 21 passes through the mounting hole 11a, and the air guide 21 is fixed with a driven bevel gear 210 that meshes with each of the driving bevel gears 123.

[0037] It is understandable that when the platform 11 is driven to rotate by the geared motor 321, the active bevel gear 123 can drive the driven bevel gear 210 to rotate, thereby driving the air guide 21 to rotate.

[0038] Based on the above scheme, in one embodiment, the air guide 21 includes an air guide pipe 211, a first rotary joint 212, a second rotary joint 213, and an exhaust pipe 214. The air guide pipe 211 is rotatably connected to the platform 11, and the driven bevel gear 210 is fixedly mounted on the air guide pipe 211. The fixed end of the first rotary joint 212 is connected to one end of the air guide pipe 211, and the movable end of the first rotary joint 212 is connected to one end of the flexible tube 22. The fixed end of the second rotary joint 213 is fixedly connected to the other end of the air guide pipe 211. One end of the exhaust pipe 214 is connected to the movable end of the second rotary joint 213, and the exhaust pipe 214 is also fixedly connected to the base 31. The other end of the exhaust pipe 214 is connected to the air extraction component 24.

[0039] Understandably, when the air duct 211 rotates, the flexible tube 22 and the buoyancy part 23 will not rotate with the air duct 211 under the action of the first rotary joint 212, and the exhaust pipe 214 will not rotate with the air duct 211 under the action of the second rotary joint 213.

[0040] Furthermore, it should be noted that the air extraction component 24 can extract air from the air guide channel in various ways. In one embodiment, the air extraction component can be connected to the exhaust pipe 214 via a mechanical pump to directly extract air from the exhaust pipe 214. When water flows out of the exhaust pipe 214, it can be determined that all the liquid inside the cylindrical workpiece has been drained.

[0041] In another embodiment, the extraction element 24 employs an ejector-type extraction method, that is, it utilizes a high-speed airflow to generate negative pressure through the outlet of the exhaust pipe 214, thereby ejecting and discharging the gas; specifically, based on the Bernoulli effect... The relationship between flow velocity and pressure: When an incompressible fluid (such as air or liquid) flows through a narrow area, the flow velocity increases. According to Bernoulli's equation, the static pressure in the area where the flow velocity increases will decrease, forming a local low-pressure area.

[0042] Simplified formula: P + 0.5ρv 2= constant.

[0043] Where P is the static pressure, ρ is the fluid density, and v is the flow velocity. When v increases, P must decrease.

[0044] Specifically, when the high-speed airflow is forced through the outlet of exhaust pipe 214, the flow velocity increases sharply due to the sudden decrease in the pipe's cross-sectional area (satisfying the continuity equation Q=Av; when the flow rate Q is constant, a decrease in cross-sectional area A leads to an increase in flow velocity v). This increased flow velocity causes a significant decrease in static pressure near the outlet of exhaust pipe 214, creating a localized negative pressure zone. This low-pressure zone near the outlet of exhaust pipe 214 forms a pressure difference (ΔP=P_outside) with the surrounding environment (normal pressure or high pressure zone). The pressure difference in the low-pressure zone (P) drives the ultra-low-pressure zone of the gas collected inside the cylindrical workpiece to move, thereby venting the gas inside the cylindrical workpiece.

[0045] In addition, based on the above scheme, a water-gas separator 26 is also connected to the exhaust pipe 214. The water-gas separator 26 is a commonly used structure in the prior art, and no other limitations are made here.

[0046] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An exhaust device characterized by, Comprising A clamping mechanism capable of fixing a cylindrical workpiece; A suction mechanism comprising a gas guide, a flexible tube, a buoyancy part and a suction part, the gas guide is installed on the clamping mechanism, the gas guide has a gas guide channel, one end of the flexible tube is connected with one end of the gas guide and communicates with the gas guide channel, the buoyancy part is connected with the other end of the flexible tube, and a through hole communicating with the flexible tube is formed in the buoyancy part, the suction part communicates with the other end of the gas guide channel and can suck the gas guide channel; when the open end of the cylindrical workpiece moves towards the liquid surface, the buoyancy part can float on the liquid surface and extend into the cylindrical workpiece.

2. An exhaust device according to claim 1, characterised in that The suction mechanism further comprises an elastic member, which is sleeved on the flexible tube.

3. An exhaust device according to claim 2, wherein The buoyancy part comprises a buoyancy block and a protruding part, the protruding part is arranged on the buoyancy block, the other end of the flexible tube is connected with the buoyancy block, the through hole penetrates through the protruding part and the buoyancy block, and a plurality of grooves are formed in the protruding part and communicate with the through hole.

4. An exhaust device according to claim 1 or 3, characterised in that The clamping mechanism comprises a table body and at least two clamping members, the at least two clamping members are installed on the table body, and a clamping space with adjustable size is formed between the two clamping members.

5. An exhaust device according to claim 4, characterised in that The clamping member comprises an adjusting screw and a limiting part, the adjusting screw is rotatably installed on the table body, the limiting part is slidably connected with the table body and threadedly rotatably connected with the adjusting screw, and the top of the limiting part has a supporting table and a limiting protrusion.

6. An exhaust device according to claim 5, wherein The limiting protrusion is in the shape of a whole arc, and the surface of the limiting protrusion abutting against the cylindrical workpiece is provided with a gasket.

7. An exhaust device according to claim 5, wherein Further comprising a rotating mechanism, the rotating mechanism comprises a base and a driving member, the base is rotatably connected with the table body, the driving member is installed on the base and can drive the table body to rotate, the gas guide is rotatably connected with the center of the table body and fixedly connected with the base.

8. An exhaust device according to claim 7, characterised in that A mounting hole is formed in the center of the table body, one end of each adjusting screw extends into the mounting hole and is rotatably connected with a driving bevel gear, the gas guide penetrates through the mounting hole, and a driven bevel gear meshing with each driving bevel gear is fixedly arranged on the gas guide.

9. An exhaust device according to claim 8, characterised in that The gas guide comprises a gas guide pipe, a first rotary joint, a second rotary joint and an exhaust pipe, the gas guide pipe is rotatably connected with the table body, the driven bevel gear is fixedly arranged on the gas guide pipe, the fixed end of the first rotary joint is connected with one end of the gas guide pipe, the movable end of the first rotary joint is connected with one end of the flexible tube, the fixed end of the second rotary joint is fixedly connected with the other end of the gas guide pipe, one end of the exhaust pipe is connected with the movable end of the second rotary joint, the exhaust pipe is further fixedly connected with the base, and the other end of the exhaust pipe communicates with the suction part.

10. An exhaust device according to claim 7, wherein The driving member comprises a speed reducer, a transmission belt and a driving pulley, the speed reducer is installed on the base, the output end of the speed reducer is fixedly connected with the driving pulley, a driven pulley is fixedly arranged on the table body, and the transmission belt is connected between the driving pulley and the driven pulley.

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