A metal hose air tightness automatic detection system and detection method

Abstract

The present invention provides an automatic detection system and method for the air tightness of a metal hose, comprising a conveying device, disassembly and assembly air supply devices are arranged on both sides of the conveying device, a detection box is set up above the conveying device, the conveying device comprises a circulating conveying mechanism, a plurality of groups of hose positioning mechanisms are arranged in a ring shape on the circulating conveying mechanism, the hose positioning mechanism comprises a clamping plate and a fixing plate arranged side by side, clamping assemblies are arranged at both ends of the clamping plate, a clamping cylinder is arranged on the top of the circulating conveying mechanism, a first release cylinder and a second release cylinder are arranged in sequence at the bottom of the circulating conveying mechanism, a good product collection basket is connected below the first release cylinder, and a defective product collection basket is connected below the second release cylinder. The detection method comprises: 1. loading; 2. feeding; 3. assembling a female head and a plug; 4. inflation detection; a. ventilation stage; b. pressure holding stage; c. deflation stage; d. abnormal alarm; 5. disassembling a female head and a plug; 6. good product collection; 7. defective product collection.

Description

Technical Field

[0001] The invention belongs to the field of mechanical technology and relates to an airtightness detection system, in particular to an automatic airtightness detection system and a detection method for a metal hose. Background Art

[0002] Corrugated metal hose is a flexible pipe that can be used as a pipe fitting for conveying various fluid media. It is usually made of stainless steel. The hose has the advantages of light weight, good flexibility, fatigue resistance, corrosion resistance, vibration reduction, noise reduction and long service life. It is widely used in petrochemical, metallurgy, locomotive, shipbuilding, aerospace, special equipment, urban water supply and energy construction. If the metal hose leaks before installation, it will cause medium leakage and a lot of economic losses in actual use. Therefore, the leakage detection of metal hose is a crucial process before the metal hose leaves the factory, and it is one of the important criteria for evaluating the safety and quality of metal hoses.

[0003] In traditional air tightness testing, inspectors are required to manually operate and use visual inspection and other means to determine whether the metal hose is leaking. In this manual testing method, the leakage rate cannot be calculated, the efficiency and safety are low, and the accuracy depends on the worker's testing level.

[0004] In order to solve the problem of traditional air tightness detection, for example, Chinese patent document 202022471000.3 discloses a device for detecting the air tightness of automobile flexible joint bellows. All operations are automated, no manual operation is required, and detection efficiency is improved; labor costs are reduced, and errors caused by human judgment in traditional detection methods are avoided, so the detection results are more accurate and intuitive. The detection method of the device does not require immersion in water, avoiding secondary contamination of the product caused by immersion in water, and does not require drying. It can directly enter the next step of operation, which can save a lot of time and cost and further improve production efficiency.

[0005] In the above technical solution, although the air tightness detection function of the pipe body is realized at a single station, it cannot realize large-scale and continuous air tightness detection of the pipe body, and lacks the fully automatic operation of multiple different stations. Loading and unloading, disassembling and assembling accessories, positioning detection, etc. still require manual assistance. In addition, the above technical solution also lacks the detection and control operations of inflation, pressure maintenance and deflation during the air tightness detection process, which leads to problems such as detection safety, accuracy and efficiency. Summary of the invention

[0006] The purpose of the present invention is to solve the above problems in the prior art and to provide an automatic detection system and method for the air tightness of a metal hose.

[0007] The object of the present invention can be achieved through the following technical solutions: an automatic air tightness detection system for a metal hose, comprising a conveying device with a head end and a tail end, disassembly and assembly air supply devices are arranged on both sides of the tail end of the conveying device, and a detection box is set above the tail end of the conveying device, characterized in that the conveying device comprises a circulating conveying mechanism, and a plurality of groups of hose positioning mechanisms are arranged in a ring shape on the circulating conveying mechanism, and the hose positioning mechanism comprises a clamping plate and a fixed plate arranged side by side, clamping assemblies are arranged at both ends of the clamping plate, a hook is arranged on the fixed plate, a clamping cylinder is arranged on the top of the circulating conveying mechanism, and a proximity sensor is fixed on the side of the clamping cylinder, and the A first release cylinder and a second release cylinder are sequentially arranged at the bottom of the circulating conveying mechanism, a proximity sensor 2 is fixedly arranged on the side of the first release cylinder, a proximity sensor 3 is fixedly arranged on the side of the second release cylinder, a good product collection basket is connected below the first release cylinder, and a defective product collection basket is connected below the second release cylinder; the disassembly and assembly air supply device comprises a machine platform, a detection sensor is arranged on the machine platform, the machine platform is connected to a working platform by a switching moving mechanism, the working platform is connected to a disassembly and assembly mechanism by a feeding mechanism 1, the working platform is connected to an air supply mechanism by a feeding mechanism 2, an external air source is connected to the detection box and is connected to the air supply mechanism through an air supply pipe.

[0008] In the above-mentioned automatic air tightness detection system for the metal hose, the circulating conveying mechanism includes side plates located on both sides, and a driving shaft and a driven shaft are hinged between the two side plates. The driving shaft is driven and connected by a conveying motor. The driving shaft is sleeved with a main sprocket, and the driven shaft is sleeved with a slave sprocket. The main sprocket and the outer periphery of the slave sprocket are connected to the chain through tooth meshing, and the end of the clamping plate / fixed plate is fixedly connected to the chain.

[0009] In the above-mentioned automatic air tightness detection system of the metal hose, the clamping assembly includes a clamping seat, a clamping hand is arranged on the clamping seat, and the clamping hand includes two relatively arranged single-sided claws, the bottom end of the single-sided claw is hinged on the clamping seat, the top of the single-sided claw has a circular arc clamping portion, the bottom of the single-sided claw is fixedly connected to the angle rod, and the middle parts of the two single-sided claws are connected by a tension spring; the clamping seat is located in the middle of the two single-sided claws to open a through hole, and the through hole is connected with a top rod that is lifted and slidable, and the top end of the top rod contacts the angle rod.

[0010] In the above-mentioned automatic air tightness detection system for the metal hose, the switching movement mechanism includes a Y motor, at least one group of Y main wheels and Y secondary wheels are hinged on the machine platform, the Y rotating shaft of the Y motor is fixedly connected to the Y main wheel, the outer periphery of the Y main wheel and the Y secondary wheel is sleeved with a Y belt, and the Y belt is fixedly connected to the working platform; the feeding mechanism 1 includes an X motor 1, at least one group of X main wheels 1 and X secondary wheels 1 is hinged on one side wall of the working platform, the X rotating shaft 1 of the X motor 1 is fixedly connected to the X main wheel 1, the outer periphery of the X main wheel 1 and the X secondary wheel 1 is sleeved with an X belt 1, and the disassembly mechanism is fixedly connected to the X belt 1; the feeding mechanism 2 includes an X motor 2, at least one group of X main wheels 2 and X secondary wheels 2 are hinged on the other side wall of the working platform, the X rotating shaft 2 of the X motor 2 is fixedly connected to the X main wheel 2, the outer periphery of the X main wheel 2 and the X secondary wheel 2 is sleeved with an X belt 2, and the air supply mechanism is fixedly connected to the X belt 2.

[0011] In the above-mentioned automatic air tightness detection system for the metal hose, the disassembly and assembly mechanism includes a disassembly and assembly frame fixedly connected to the belt one, a disassembly and assembly motor is fixedly installed on the disassembly and assembly frame, the disassembly and assembly motor is connected to a sleeve via a coupling, and a quick-release air supply female connector or a plug is arranged in the sleeve; the air supply mechanism includes an air supply frame fixedly connected to the belt two, and a quick-release air supply male connector is arranged on the air supply frame.

[0012] A detection method of an automatic air tightness detection system for a metal hose, applied to the automatic air tightness detection system for the metal hose, the detection method comprises the following steps:

[0013] 1) Start the circulating conveying mechanism to drive the hose positioning mechanism to operate in a directional manner. When the proximity sensor senses that the clamping assembly on the clamping plate has reached the loading station, the circulating conveying mechanism stops, the clamping cylinder extends the push rod to drive the clamping hand to open, and the mouth of the metal hose is placed in the clamping hand. At the same time, the middle section of the metal hose is wrapped around the hook, and the clamping cylinder retracts the push rod to close the clamping hand to clamp the mouth of the metal hose;

[0014] 2) Start the circulating conveying mechanism to drive the metal hose to continue to be transported to the inspection station in a directional manner. When the detection sensor senses that the metal hose has arrived at the inspection station, the circulating conveying mechanism stops, and the switching moving mechanisms on both sides are started to translate the working platform along the Y direction. The disassembly and assembly mechanisms on both sides are simultaneously aligned with the pipe openings of the metal hose. The feeding mechanisms on both sides are simultaneously started to push the disassembly and assembly mechanisms forward. The disassembly and assembly motor on one side is started to drive the sleeve to rotate forward to screw the quick-release air supply female head onto the threaded pipe opening at one end of the metal hose. The disassembly and assembly motor on the other side is started to drive the sleeve to rotate forward to screw the plug onto the threaded pipe opening at the other end of the metal hose. The feeding mechanisms on both sides are simultaneously started to withdraw the disassembly and assembly mechanisms.

[0015] 3) Start the switching moving mechanism on one side to translate the working platform along the Y direction, align the air supply mechanism with the quick-release air supply female connector at the mouth of the metal hose, start the second feeding mechanism to push the air supply mechanism forward, so that the quick-release air supply male connector is sealed and connected with the quick-release air supply female connector, open the detection box to test the air tightness of the metal hose, record the air tightness of the metal hose after the test, control the pressure release through the detection box, and start the second feeding mechanism to withdraw the air supply mechanism out of the quick-release air supply male connector;

[0016] 4) Start the switching moving mechanism on both sides to translate the working platform along the Y direction, align the disassembly and assembly mechanisms on both sides with the pipe mouth of the metal hose simultaneously, start the feeding mechanism on both sides simultaneously to push the disassembly and assembly mechanism forward, start the disassembly and assembly motor on one side to drive the sleeve to rotate in the opposite direction to unscrew the quick-release air supply female connector from one end of the metal hose, start the disassembly and assembly motor on the other side to drive the sleeve to rotate in the opposite direction to unscrew the plug from the other end of the metal hose, and start the feeding mechanism on both sides simultaneously to withdraw the disassembly and assembly mechanism;

[0017] 5) Start the circulating conveying mechanism to drive the metal hose to continue directional transportation. If the air tightness of the detected metal hose is good, when the proximity sensor 2 senses that the metal hose has reached the good product position, the circulating conveying mechanism stops, the first release cylinder extends the push rod to drive the clamp to open, and the metal hose is released to fall into the good product collection basket;

[0018] 6) Start the circulating conveying mechanism to drive the metal hose to continue directional transportation. If the air tightness of the detected metal hose is not good, when the proximity sensor 3 senses that the metal hose has reached the defective product position, the circulating conveying mechanism stops, and the second release cylinder extends the push rod to drive the clamp to open, releasing the metal hose to fall into the defective product collection basket.

[0019] In the above-mentioned detection method of the metal hose air tightness automatic detection system, the metal hose air tightness detection in step 3) is carried out in three stages, including the ventilation stage, the pressure holding stage and the air release stage in sequence;

[0020] a. Ventilation phase:

[0021] The external gas source supplies gas to the metal hose through the detection box. When the pressure sensor in the detection box detects that the pressure reaches a given pressure value, the gas supply is stopped;

[0022] b. Pressure holding stage:

[0023] The air pressure in the metal hose is monitored by the pressure sensor in the detection box. When the pressure drops within ΔP, the air tightness of the metal hose is judged to be good.

[0024] c. Deflation stage:

[0025] Wait for the air pressure in the metal hose to drop to And the deflation time is greater than When the air is in the air conditioner, pull out the quick-release air supply male connector to release the air;

[0026] in is the final air pressure after deflation. is the calculated deflation time.

[0027] In the above-mentioned detection method of the metal hose air tightness automatic detection system, in step a ventilation stage and step c deflation stage,

[0028] The relevant relationship is as follows:

[0029] The gas provided by the external air pump is regarded as an ideal gas, and the relationship between the inflation time and the radius r and length l of the metal hose is obtained:

[0030] (1)

[0031] in, is the inflation time (s); is the external air pump flow rate (m 3 / s);

[0032] During the deflation process, determine the air pressure in the metal hose:

[0033] ;

[0034] The gas flow state is choked flow; the flow parameters at the metal hose port are obtained:

[0035] (2)

[0036] (3)

[0037] (4)

[0038] in, , is standard atmospheric pressure, is the critical density, is the critical temperature, is the gas constant, take 0.287 , is the ambient temperature, is the critical state parameter of air, take 1.4, is the outlet air flow velocity;

[0039] The mass flow at the outlet of the metal hose is:

[0040] (5)

[0041] is the mass flow at the outlet (kg / s), is the area of ​​the metal hose orifice (m²);

[0042] The conversion relationship between mass and amount of gas substance is:

[0043] (6)

[0044] Where m is the mass of gas (kg), n is the amount of substance in the air in the hose (mol), and M is the molar mass of air (kg / mol);

[0045] The volume calculation formula of the metal hose is:

[0046] (7)

[0047] Combining formulas (2)-(7) to obtain the deflation time The calculation formula is:

[0048] ;

[0049] from ( ) Points to ( )have

[0050] ;

[0051] in The amount of air in the metal hose after deflation (mol); is the amount of air in the metal hose under the test pressure (mol), where t is the deflation time (s);

[0052] Since it takes a certain amount of time for the gas to move in the metal hose, a compensation time is added. , Related to the pipe length l;

[0053] ;

[0054] Finally, the deflation time is:

[0055] (8)

[0056] When the test box is working in the pressure holding stage of step b, the inflation and deflation times calculated according to formula (1) and formula (8) are verified.

[0057] In the above-mentioned detection method of the air tightness automatic detection system of the metal hose, during the inflation stage, when the value of the pressure sensor in the detection box begins to change, the timing starts, and when the inflation time has passed, the timing starts. After that, if the pressure sensor reading is still lower than the pressure value required for detection, an alarm will be sounded, indicating that a fault occurred during the inflation stage.

[0058] In the above-mentioned detection method of the air tightness automatic detection system of the metal hose, in the deflation stage, the timing starts when the deflation solenoid valve is opened, and after the deflation time After that, the reading of the pressure sensor is collected. If the reading at this time is the same as the atmospheric pressure or the error is within the rated safety range, the next step is carried out. If the reading at this time is outside the rated safety range, an alarm is issued to indicate that a fault has occurred during the deflation stage.

[0059] Compared with the prior art, the automatic air tightness detection system and detection method of the metal hose have the following beneficial effects:

[0060] 1. This mechanical system is reasonably designed and is a high-efficiency automatic air tightness detection device. It eliminates the steps of manually screwing in the plug and the air supply port for detection. It is safe and reliable, with a high degree of automation, which greatly improves work efficiency and can adapt well to the scene of air tightness detection.

[0061] 2. The use of an automated testing system, through the directional transportation of the circulating conveying mechanism and the automated execution of each step, can quickly and efficiently complete the detection of the air tightness of the metal hose, thereby improving production efficiency. The system is equipped with multiple sensors and monitoring devices, which can monitor the position, state and air tightness of the metal hose in real time to ensure the accuracy and reliability of the test results. It effectively avoids the effects of missed detection and false detection caused by manual observation errors. At the same time, it also improves the safety of the test.

[0062] 3. It can accurately judge the leakage rate of metal hoses, providing an accurate basis for the diagnosis and repair of metal hose failures. According to the test results, the system can automatically place qualified and unqualified metal hoses into good product collection baskets and defective product collection baskets respectively, realizing the automated sorting function and improving production efficiency and product quality.

[0063] 4. The switching mechanism and feeding mechanism in the system can flexibly adjust the position and movement trajectory to meet the detection requirements of metal hoses of different specifications and models, improving the applicability and flexibility of the system. Each step in the detection operation is clear and the operation process is simple, which reduces the training cost of operators and improves the stability and operability of the production line.

[0064] In summary, the automatic airtightness detection system has many beneficial effects such as high degree of automation, efficient detection, precise positioning, easy operation and rapid disassembly and assembly of parts. It can improve production efficiency, ensure product quality, reduce costs, and has high practical value and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is the overall three-dimensional structure diagram of the present invention.

[0066] Figure 2 It is a three-dimensional structural diagram of the disassembly and assembly of the air supply device in the present invention.

[0067] Figure 3 It is a schematic diagram of the orbital motion of the switching movement mechanism, the feeding mechanism 1 and the feeding mechanism 2 in the present invention.

[0068] Figure 4 It is an enlarged three-dimensional structural schematic diagram of the clamping assembly in the present invention.

[0069] Figure 5 It is a schematic diagram of the top view of the disassembly and assembly of the air supply device in the present invention.

[0070] In the figure, 1, side plate; 2, clamping plate; 3, clamping hand; 4, tension spring; 5, push rod; 6, fixing plate; 7, hook; 8, clamping cylinder; 9, first release cylinder; 10, good product collection basket; 11, second release cylinder; 12, bad product collection basket; 13, Y motor; 14, Y belt; 15, working platform; 16, X motor one; 17, X belt one; 18, disassembly and assembly rack; 19, disassembly and assembly motor; 20, coupling; 21, sleeve; 22, quick-release air supply female connector; 23, X motor two; 24, X belt two; 25, air supply rack; 26, quick-release air supply male connector; 27, truss; 28, inspection box. DETAILED DESCRIPTION

[0071] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0072] like Figures 1 to 5As shown, the present invention is an automatic air tightness detection system for a metal hose, comprising a conveying device with a head end and a tail end, disassembly and assembly air supply devices are arranged on both sides of the tail end of the conveying device, a detection box 28 is set above the tail end of the conveying device, the conveying device comprises a circulating conveying mechanism, and a plurality of groups of hose positioning mechanisms are arranged in a ring shape on the circulating conveying mechanism, the hose positioning mechanism comprises a clamping plate 2 and a fixed plate 6 arranged side by side, clamping assemblies are arranged at both ends of the clamping plate 2, a hook 7 is arranged on the fixed plate 6, a clamping cylinder 8 is arranged on the top of the circulating conveying mechanism, a proximity sensor 1 is fixedly arranged on the side of the clamping cylinder 8, and a bottom of the circulating conveying mechanism is arranged in sequence. A first release cylinder 9 and a second release cylinder are arranged, a proximity sensor 2 is fixedly arranged on the side of the first release cylinder 9, a proximity sensor 3 is fixedly arranged on the side of the second release cylinder, a good product collection basket 10 is connected to the bottom of the first release cylinder 9, and a defective product collection basket 12 is connected to the bottom of the second release cylinder; the disassembly and assembly air supply device includes a machine platform, a detection sensor is arranged on the machine platform, the machine platform is connected to a working platform 15 by a switching moving mechanism, the working platform 15 is connected to a disassembly and assembly mechanism by a feeding mechanism 1, the working platform 15 is connected to an air supply mechanism by a feeding mechanism 2, and an external air source is connected to a detection box 28 and is connected to the air supply mechanism through an air supply pipe.

[0073] like Figure 1 As shown, a truss 27 is fixed on the outside of the conveyor, and a detection box 28 is fixed at one end corner of the truss 27. A solenoid valve and a pressure sensor are installed inside the detection box 28 to control the inflation and deflation and detect the air tightness of the metal hose. The proximity sensor is used to sense whether the clamping assembly has moved to a specified position. In order to avoid interference to the proximity sensor caused by an overly long metal hose, the sensing range of the proximity sensor needs to be accurately set, and distances below or above the sensing range are determined to be metal hoses.

[0074] In order to reduce the number of starts and stops of the conveyor and make the operation more stable and smooth, by setting the length of the conveyor, the clamping cylinder 8, the first release cylinder 9, the second release cylinder and the position of the air supply mechanism, the three processes of loading, testing and releasing can be carried out simultaneously when the conveyor stops.

[0075] Preferably, the circulating conveying mechanism includes side plates 1 located on both sides, and a driving shaft and a driven shaft are hinged between the two side plates 1. The driving shaft is connected by a conveying motor drive, a main sprocket is sleeved on the driving shaft, and a slave sprocket is sleeved on the driven shaft. The main sprocket and the slave sprocket are connected to the chain through tooth meshing at the outer periphery, and the end of the clamping plate 2 / fixed plate 6 is fixedly connected to the chain.

[0076] A main sprocket is sleeved at each end of the driving shaft, a slave sprocket is sleeved at each end of the driven shaft, and a chain is sleeved on the driving shaft and the driven shaft on the same side, for a total of two chains. The conveying motor is started to drive the driving shaft and the main sprocket to rotate in a directional manner, and the slave sprocket and the chain are driven to rotate in a directional manner through tooth meshing transmission, so that the clamping plate 2 and the fixed plate 6 between the two chains are conveyed in a directional manner. Two symmetrically arranged clamping cylinders 8 are fixedly mounted on the top edge of the side plate 1. Two symmetrically arranged first release cylinders 9 / second release cylinders are fixedly mounted on the bottom edge of the side plate 1.

[0077] like Figure 4 As shown, preferably, the clamping assembly includes a clamping seat, on which a clamping hand 3 is arranged, the clamping hand 3 includes two relatively arranged single-sided claws, the bottom ends of the single-sided claws are hinged on the clamping seat, the tops of the single-sided claws have arc clamping portions, the bottoms of the single-sided claws are fixedly connected to the angle rod, and the middle parts of the two single-sided claws are connected by a tension spring 4; the clamping seat is located in the middle of the two single-sided claws and a through hole is provided, and a top rod 5 is passed through the through hole in a lifting and sliding manner, and the top end of the top rod 5 contacts the angle rod.

[0078] The single-sided claw includes a straight rod, and an angle rod is fixedly connected to the bottom end of the straight rod, and an acute angle is formed between the angle rod and the straight rod; the top of the straight rod is fixedly connected to the curved arc rod to form an arc clamping part. The clamping cylinder 8 / the first release cylinder 9 / the second release cylinder extends the push rod, and the push rod enters under the push rod 5 to lift the push rod 5. The push rod 5 pushes the two angle rods, and synchronously drives the two single-sided claws to swing outward, so that the arc clamping parts on both sides expand and release the metal hose, and at the same time, the tension spring 4 is stretched. The clamping cylinder 8 / the first release cylinder 9 / the second release cylinder retracts the push rod, and the push rod is withdrawn from under the push rod 5. The push rod 5 drops under the action of gravity, and the single-sided claws on both sides are brought inward by the elastic tension of the tension spring 4, and the arc clamping parts are combined to clamp the metal hose.

[0079] like Figure 2 and 3 As shown, preferably, the switching movement mechanism includes a Y motor 13, at least one group of Y main wheels and Y secondary wheels are hinged on the machine table, the Y rotating shaft of the Y motor 13 is fixedly connected to the Y main wheel, the outer peripheries of the Y main wheel and the Y secondary wheel are sleeved with a Y belt 14, and the Y belt 14 is fixedly connected to a working platform 15; the feeding mechanism 1 includes an X motor 16, at least one group of X main wheels 1 and X secondary wheels 1 are hinged on one side wall of the working platform 15, the X rotating shaft 1 of the X motor 16 is fixedly connected to the X main wheel 1, the outer peripheries of the X main wheel 1 and the X secondary wheel 1 are sleeved with an X belt 17, and the X belt 17 is fixedly connected to the disassembly and assembly mechanism; the feeding mechanism 2 includes an X motor 23, at least one group of X main wheels 2 and X secondary wheels 2 are hinged on the other side wall of the working platform 15, the X rotating shaft 2 of the X motor 23 is fixedly connected to the X main wheel 2, the outer peripheries of the X main wheel 2 and the X secondary wheel 2 are sleeved with an X belt 24, and the X belt 24 is fixedly connected to the air supply mechanism.

[0080] Start the Y motor 13 to drive the working platform 15 to move back and forth in the Y direction through the belt structure transmission, which plays the reciprocating switching function of disassembly and air supply. Start the X motor 16 to drive the disassembly mechanism to move back and forth in the X direction through the belt structure transmission, which plays the feeding, disassembly, and withdrawal operation. Start the X motor 23 to drive the air supply mechanism to move back and forth in the X direction through the belt structure transmission, which plays the feeding, air supply, and withdrawal operation. This embodiment uses a motor-driven belt structure transmission to achieve a translational movement in a set direction. It can also be replaced by a cylinder, an electric cylinder, a slideway, and other structures to achieve a reciprocating translational movement in a set direction.

[0081] like Figure 2 and 5 As shown, preferably, the disassembly and assembly mechanism includes a disassembly and assembly frame 18 fixedly connected to the belt one, a disassembly and assembly motor 19 fixedly mounted on the disassembly and assembly frame 18, the disassembly and assembly motor 19 is connected to the sleeve 21 through a coupling 20, and a quick-release air supply female connector 22 or a plug is arranged in the sleeve 21; the air supply mechanism includes an air supply frame 25 fixedly connected to the belt two, and a quick-release air supply male connector 26 is arranged on the air supply frame 25.

[0082] The disassembly and assembly mechanism is divided into two parts, which are respectively located on the left and right sides of the chain forward direction. The disassembly and assembly mechanism located on the left side includes a disassembly and assembly motor 19, a sleeve 21 and a quick-release air supply female connector 22, wherein the quick-release air supply female connector 22 is placed in the sleeve 21. The disassembly and assembly mechanism located on the right side includes a disassembly and assembly motor 19, a sleeve 21 and a plug, wherein the plug is placed in the sleeve 21.

[0083] Start the disassembly motor 19 to drive the sleeve 21 to rotate forward to screw the quick-release air supply female head 22 or the plug onto the threaded pipe mouth of the metal hose; start the disassembly motor 19 to drive the sleeve 21 to rotate reversely to unscrew the quick-release air supply female head 22 or the plug from the threaded pipe mouth of the metal hose. A torque sensor is set on the output end of the disassembly motor 19. When the sleeve 21 is screwed, the torque value is detected by the torque sensor. When the torque reaches the given torque T, it is judged to be tightened, and the disassembly motor 19 controls the sleeve 21 to stop rotating. The given torque T is determined by the torque measured by the torque wrench when manually tightened. The external air source is connected to the detection box 28 through a hose, and the detection box 28 is then connected to the quick-release air supply male head 26 through a hose. The quick-release air supply male head 26 is sealed with the quick-release air supply female head 22. The air supply equipment is started to deliver air, and the high-pressure gas enters the metal hose through the detection box 28, the quick-release air supply male head 26, and the quick-release air supply female head 22 for air tightness detection. Embodiment 2

[0084] Based on the first embodiment, the differences of this embodiment are as follows:

[0085] A detection method of an automatic air tightness detection system for a metal hose is applied to the above-mentioned automatic air tightness detection system for a metal hose, and the detection method comprises the following steps:

[0086] 1) Start the circulating conveying mechanism to drive the hose positioning mechanism to operate in a directional manner. When the proximity sensor senses that the clamping assembly on the clamping plate 2 has reached the loading station, the circulating conveying mechanism stops, the clamping cylinder 8 extends the push rod to drive the clamping hand 3 to open, and put the nozzle of the metal hose into the clamping hand 3. At the same time, the middle section of the metal hose is wound around the hook 7. The hook 7 constrains the excessively long metal hose roll to prevent the metal hose from being unconstrained during the transmission and movement, causing displacement and deformation, and causing damage to the device and the hose. The clamping cylinder 8 retracts the push rod to make the clamping hand 3 close and clamp the nozzle of the metal hose;

[0087] 2) Start the circulating conveying mechanism to drive the metal hose to continue to be transported to the inspection station in a directional manner. When the detection sensor senses that the metal hose has arrived at the inspection station, the circulating conveying mechanism stops, and the switching moving mechanisms on both sides are started to translate the working platform 15 in the Y direction, and the disassembly and assembly mechanisms on both sides are simultaneously aligned with the pipe openings of the metal hose, and the feeding mechanisms on both sides are simultaneously started to push the disassembly and assembly mechanisms forward. On one side, the disassembly and assembly motor 19 is started to drive the sleeve 21 to rotate forward to screw the quick-release air supply female connector 22 onto the threaded pipe opening at one end of the metal hose, and on the other side, the disassembly and assembly motor 19 is started to drive the sleeve 21 to rotate forward to screw the plug onto the threaded pipe opening at the other end of the metal hose, and the feeding mechanisms on both sides are simultaneously started to withdraw the disassembly and assembly mechanisms;

[0088] 3) Start the switching mechanism on one side to translate the working platform 15 along the Y direction, align the air supply mechanism with the quick-release air supply female connector 22 at the mouth of the metal hose, start the second feeding mechanism to push the air supply mechanism forward, so that the quick-release air supply male connector 26 is sealed and connected with the quick-release air supply female connector 22. To ensure the air tightness during the test, there is a convex ring on the quick-release air supply male connector 26, a groove in the quick-release air supply female connector 22, and a gasket at the port. The quick-release air supply male connector 26 is inserted into the quick-release air supply female connector 22 to ensure good air tightness at the connection. Open the test box 28 to test the air tightness of the metal hose. After the test, record the air tightness of the metal hose, control the pressure release through the test box 28, and start the second feeding mechanism to move the air supply mechanism back out of the quick-release air supply male connector 26;

[0089] 4) Start the switching moving mechanism on both sides to translate the working platform 15 along the Y direction, align the disassembly and assembly mechanisms on both sides with the pipe opening of the metal hose simultaneously, start the feeding mechanism on both sides simultaneously to push the disassembly and assembly mechanisms forward, start the disassembly and assembly motor 19 on one side to drive the sleeve 21 to rotate in the opposite direction to unscrew the quick-release air supply female connector 22 from one end of the metal hose, start the disassembly and assembly motor 19 on the other side to drive the sleeve 21 to rotate in the opposite direction to unscrew the plug from the other end of the metal hose, and start the feeding mechanism on both sides simultaneously to withdraw the disassembly and assembly mechanisms;

[0090] 5) Start the circulating conveying mechanism to drive the metal hose to continue directional transportation. If the air tightness of the detected metal hose is good, when the proximity sensor 2 senses that the metal hose has reached the good product position, the circulating conveying mechanism stops, and the first release cylinder 9 extends the push rod to drive the clamp 3 to open, releasing the metal hose to fall into the good product collection basket 10;

[0091] 6) Start the circulating conveying mechanism to drive the metal hose to continue directional transportation. If the air tightness of the detected metal hose is not good, when the proximity sensor 3 senses that the metal hose has reached the defective product position, the circulating conveying mechanism stops, and the second release cylinder extends the push rod to drive the clamp 3 to open, releasing the metal hose to fall into the defective product collection basket 12.

[0092] Preferably, the air tightness test of the metal hose in step 3) is carried out in three stages, including a ventilation stage, a pressure holding stage and a deflation stage in sequence;

[0093] a. Ventilation phase:

[0094] The external gas source supplies gas to the metal hose through the detection box 28. When the pressure sensor in the detection box 28 detects that the pressure reaches a given pressure value, the gas supply is stopped;

[0095] Ventilation time Determined according to the diameter r and length l of the metal hose.

[0096] b. Pressure holding stage:

[0097] The air pressure in the metal hose is monitored by the pressure sensor in the detection box 28. When the pressure drops within ΔP, it is determined that the air tightness of the metal hose is good.

[0098] The pressure difference ΔP is determined according to the diameter r, length l and specified pressure value P of the metal hose.

[0099] c. Deflation stage:

[0100] Wait for the air pressure in the metal hose to drop to And the deflation time is greater than When the air is released, pull out the quick-release air supply male connector 26 to release the air.

[0101] in is the final air pressure after deflation. is the calculated deflation time.

[0102] In order to avoid the potential safety hazard caused by the large pressure difference between the inside and outside of the quick-release air supply male connector 26 when it is pulled out, it is necessary to wait for the air pressure in the metal hose to drop to In addition, when measuring a long metal hose, during the deflation stage, the gas flow rate is too fast, which may cause the pressure sensor to misdetect. In addition, due to the long pipeline, the gas flow has hysteresis, which may cause the pressure at the inflation end to drop to However, if the air pressure at the plug end is still high, pulling out the male plug may cause safety hazards. Therefore, only when the pressure value P in the hose is less than And the deflation time is greater than Deflate when According to the pipe diameter r, pipe length l and test pressure value Sure.

[0103] In the design of the control scheme, the logical relationship between air tightness detection and the overall workflow was taken into consideration and relevant designs were made. During the air tightness test phase, the diameter and length of the metal hose determine the amount of ventilation and the length of deflation time, and the air pressure and power of the air pump determine the efficiency of inflation during the test.

[0104] Preferably, in step a, the ventilation phase and step c, the deflation phase,

[0105] The relevant relationship is as follows:

[0106] The gas provided by the external air pump is regarded as an ideal gas, and the relationship between the inflation time and the radius r (m) and length l (m) of the metal hose is obtained:

[0107] (1)

[0108] in, is the inflation time (s); is the external air pump flow rate (m 3 / s);

[0109] During the deflation process, determine the air pressure in the metal hose:

[0110] ;

[0111] The gas flow state is choked flow; the flow parameters at the metal hose port are obtained:

[0112] (2)

[0113] (3)

[0114] (4)

[0115] in, , is standard atmospheric pressure (kpa), is the critical density (kg / m3 ), is the critical temperature (K), is the gas constant, take 0.287 , is the ambient temperature (K), is the critical state parameter of air, take 1.4, is the outlet air flow velocity (m / s);

[0116] The metal hose exchanges heat with the outside world quickly, without considering the temperature changes inside the tube caused by air flow.

[0117] The mass flow at the outlet of the metal hose is:

[0118] (5)

[0119] is the mass flow at the outlet (kg / s), is the area of ​​the metal hose orifice (m²);

[0120] The conversion relationship between mass and amount of gas substance is:

[0121] (6)

[0122] Where m is the mass of gas (kg), n is the amount of substance in the air in the hose (mol), and M is the molar mass of air (kg / mol);

[0123] The volume calculation formula of the metal hose is:

[0124] (7)

[0125] Combining formulas (2)-(7) to obtain the deflation time The calculation formula is:

[0126] ;

[0127] from ( ) Points to ( )have

[0128] ;

[0129] in is the amount of air in the metal hose after deflation (mol), is the amount of air in the metal hose under the test pressure (mol), where t is the deflation time (s);

[0130] Since it takes a certain amount of time for the gas to move in the metal hose, a compensation time is added. , Related to the pipe length l;

[0131] ;

[0132] Finally, the deflation time is:

[0133] (8)

[0134] During the deflation phase, after the deflation time After that, pull out the gas supply male connector for subsequent operations to ensure safety;

[0135] When the detection box 28 is working in the pressure-maintaining stage of step b, the inflation and deflation times calculated according to formula (1) and formula (8) are verified.

[0136] Preferably, during the inflation phase, the timing starts when the value of the pressure sensor in the detection box 28 starts to change, and when the inflation time has passed, the timing starts. After that, if the pressure sensor reading is still lower than the pressure value required for detection, an alarm will be sounded, indicating that a fault occurred during the inflation stage.

[0137] Preferably, in the deflation stage, the timing starts when the deflation solenoid valve is opened, and after the deflation time After that, the reading of the pressure sensor is collected. If the reading at this time is the same as the atmospheric pressure or the error is within the rated safety range, the next step is carried out. If the reading at this time is outside the rated safety range, an alarm is issued to indicate that a failure has occurred during the deflation stage.

[0138] The specific embodiments described herein are merely examples of the spirit of the present invention. A person skilled in the art of the present invention may make various modifications or supplements to the specific embodiments described or replace them in a similar manner, but will not deviate from the spirit of the present invention or exceed the defined scope. Although the present invention is described and described in detail in the accompanying drawings and the foregoing description, such descriptions and descriptions are considered to be illustrative or exemplary rather than restrictive. Specifically, the present invention encompasses other embodiments with any combination of features from the above-mentioned different embodiments. With respect to the use of the expression "generally" or "substantially", this patent application should be understood to disclose that these features and values ​​are also fully satisfied, i.e., there is no aforementioned characterization as "generally" or "substantially".

[0139] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An automatic air tightness detection system for a metal hose, comprising a conveying device having a head end and a tail end, a disassembly and assembly air supply device being arranged on both sides of the tail end of the conveying device, and a detection box being arranged above the tail end of the conveying device, characterized in that: The conveying device includes a circulating conveying mechanism, on which a plurality of groups of hose positioning mechanisms are arranged in a ring shape, the hose positioning mechanism includes a clamping plate and a fixed plate arranged side by side, clamping assemblies are arranged at both ends of the clamping plate, and a hook is arranged on the fixed plate. A clamping cylinder is arranged on the top of the circulating conveying mechanism, and a proximity sensor 1 is fixedly arranged on the side of the clamping cylinder. A first release cylinder and a second release cylinder are arranged in sequence on the bottom of the circulating conveying mechanism, and a proximity sensor 2 is fixedly arranged on the side of the first release cylinder, and a proximity sensor 3 is fixedly arranged on the side of the second release cylinder. A good product collection basket is connected below the first release cylinder, and a defective product collection basket is connected below the second release cylinder. The disassembly and assembly air supply device includes a machine platform, a detection sensor is arranged on the machine platform, the machine platform is connected to a working platform by a switching moving mechanism, the working platform is connected to a disassembly and assembly mechanism by a feeding mechanism 1, and the working platform is connected to an air supply mechanism by a feeding mechanism 2. An external air source is connected to the detection box and is connected to the air supply mechanism through an air supply pipe.

2. The automatic air tightness detection system of the metal hose according to claim 1, characterized in that: The circulating conveying mechanism includes side plates located on both sides, and a driving shaft and a driven shaft are hinged between the two side plates. The driving shaft is driven and connected by a conveying motor. A main sprocket is sleeved on the driving shaft, and a slave sprocket is sleeved on the driven shaft. The main sprocket and the slave sprocket are connected to the chain through tooth meshing on the outer periphery, and the end of the clamping plate / fixed plate is fixedly connected to the chain.

3. The automatic air tightness detection system of the metal hose according to claim 2, characterized in that: The clamping assembly includes a clamping seat, on which a clamping hand is arranged, and the clamping hand includes two relatively arranged single-sided claws, the bottom ends of the single-sided claws are hinged to the clamping seat, the tops of the single-sided claws are provided with an arc clamping portion, the bottoms of the single-sided claws are fixedly connected to an angle rod, and the middle parts of the two single-sided claws are connected by a tension spring; the clamping seat is located in the middle of the two single-sided claws and a through hole is provided, and a top rod is passed through the through hole in a lifting and sliding manner, and the top end of the top rod contacts the angle rod.

4. The automatic air tightness detection system of the metal hose according to claim 3, characterized in that: The switching movement mechanism includes a Y motor, at least one group of Y main wheels and Y secondary wheels are hinged on the machine platform, the Y rotating shaft of the Y motor is fixedly connected to the Y main wheels, the outer peripheries of the Y main wheels and the Y secondary wheels are sleeved with Y belts, and the working platform is fixedly connected to the Y belt; the feeding mechanism 1 includes an X motor 1, at least one group of X main wheels 1 and X secondary wheels 1 are hinged on one side wall of the working platform, the X rotating shaft 1 of the X motor 1 is fixedly connected to the X main wheel 1, the outer peripheries of the X main wheel 1 and the X secondary wheel 1 are sleeved with X belt 1, and the disassembly mechanism is fixedly connected to the X belt 1; the feeding mechanism 2 includes an X motor 2, at least one group of X main wheels 2 and X secondary wheels 2 are hinged on the other side wall of the working platform, the X rotating shaft 2 of the X motor 2 is fixedly connected to the X main wheel 2, the outer peripheries of the X main wheel 2 and the X secondary wheel 2 are sleeved with X belt 2, and the air supply mechanism is fixedly connected to the X belt 2.

5. The automatic air tightness detection system of the metal hose according to claim 4, characterized in that: The disassembly and assembly mechanism includes a disassembly and assembly frame fixedly connected to the belt one, a disassembly and assembly motor is fixedly installed on the disassembly and assembly frame, the disassembly and assembly motor is connected to a sleeve via a coupling, a quick-release air supply female head or a plug is arranged in the sleeve; the air supply mechanism includes an air supply frame fixedly connected to the belt two, a quick-release air supply male head is arranged on the air supply frame.

6. A method for detecting the air tightness of a metal hose automatic detection system, characterized in that: The automatic air tightness detection system for the metal hose as claimed in claim 5, wherein the detection method comprises the following steps: 1) Start the circulating conveying mechanism to drive the hose positioning mechanism to operate in a directional manner. When the proximity sensor senses that the clamping assembly on the clamping plate has reached the loading station, the circulating conveying mechanism stops, the clamping cylinder extends the push rod to drive the clamping hand to open, and the mouth of the metal hose is placed in the clamping hand. At the same time, the middle section of the metal hose is wrapped around the hook, and the clamping cylinder retracts the push rod to close the clamping hand to clamp the mouth of the metal hose; 2) Start the circulating conveying mechanism to drive the metal hose to continue to be transported to the inspection station in a directional manner. When the detection sensor senses that the metal hose has arrived at the inspection station, the circulating conveying mechanism stops, and the switching moving mechanisms on both sides are started to translate the working platform along the Y direction. The disassembly and assembly mechanisms on both sides are simultaneously aligned with the pipe openings of the metal hose. The feeding mechanisms on both sides are simultaneously started to push the disassembly and assembly mechanisms forward. The disassembly and assembly motor on one side is started to drive the sleeve to rotate forward to screw the quick-release air supply female head onto the threaded pipe opening at one end of the metal hose. The disassembly and assembly motor on the other side is started to drive the sleeve to rotate forward to screw the plug onto the threaded pipe opening at the other end of the metal hose. The feeding mechanisms on both sides are simultaneously started to withdraw the disassembly and assembly mechanisms. 3) Start the switching moving mechanism on one side to translate the working platform along the Y direction, align the air supply mechanism with the quick-release air supply female connector at the mouth of the metal hose, start the second feeding mechanism to push the air supply mechanism forward, so that the quick-release air supply male connector is sealed and connected with the quick-release air supply female connector, open the detection box to test the air tightness of the metal hose, record the air tightness of the metal hose after the test, control the pressure release through the detection box, and start the second feeding mechanism to withdraw the air supply mechanism out of the quick-release air supply male connector; 4) Start the switching moving mechanism on both sides to translate the working platform along the Y direction, align the disassembly and assembly mechanisms on both sides with the pipe mouth of the metal hose simultaneously, start the feeding mechanism on both sides simultaneously to push the disassembly and assembly mechanism forward, start the disassembly and assembly motor on one side to drive the sleeve to rotate in the opposite direction to unscrew the quick-release air supply female connector from one end of the metal hose, start the disassembly and assembly motor on the other side to drive the sleeve to rotate in the opposite direction to unscrew the plug from the other end of the metal hose, and start the feeding mechanism on both sides simultaneously to withdraw the disassembly and assembly mechanism; 5) Start the circulating conveying mechanism to drive the metal hose to continue directional transportation. If the air tightness of the detected metal hose is good, when the proximity sensor 2 senses that the metal hose has reached the good product position, the circulating conveying mechanism stops, the first release cylinder extends the push rod to drive the clamp to open, and the metal hose is released to fall into the good product collection basket; 6) Start the circulating conveying mechanism to drive the metal hose to continue directional transportation. If the air tightness of the detected metal hose is not good, when the proximity sensor 3 senses that the metal hose has reached the defective product position, the circulating conveying mechanism stops, and the second release cylinder extends the push rod to drive the clamp to open, releasing the metal hose to fall into the defective product collection basket.

7. The detection method of the automatic detection system for air tightness of a metal hose according to claim 6, characterized in that: The air tightness test of the metal hose in step 3) is carried out in three stages, including a ventilation stage, a pressure holding stage and a deflation stage in sequence; a. Ventilation phase: The external gas source supplies gas to the metal hose through the detection box. When the pressure sensor in the detection box detects that the pressure reaches a given pressure value, the gas supply is stopped; b. Pressure holding stage: The air pressure in the metal hose is monitored by the pressure sensor in the detection box. When the pressure drops within ΔP, the air tightness of the metal hose is judged to be good. c. Deflation stage: Wait for the air pressure in the metal hose to drop to And the deflation time is greater than When the air is released, pull out the quick-release air supply male connector to release the air. is the final air pressure after deflation. is the calculated deflation time.

8. The detection method of the automatic detection system for air tightness of a metal hose according to claim 7, characterized in that: In step a, the ventilation phase and step c, the deflation phase, The relevant relationship is as follows: The gas provided by the external air pump is regarded as an ideal gas, and the relationship between the inflation time and the radius r and length l of the metal hose is obtained: （1） in, is the inflation time (s); is the external air pump flow rate (m 3 / s); During the deflation process, determine the air pressure in the metal hose: ； The gas flow state is choked flow; the flow parameters at the metal hose port are obtained: （2） （3） （4） in, , is standard atmospheric pressure, is the critical density, is the critical temperature, is the gas constant, take 0.287 , is the ambient temperature, is the critical state parameter of air, take 1.4, is the outlet air flow velocity; The mass flow at the outlet of the metal hose is: （5） is the mass flow at the outlet (kg / s), is the area of ​​the metal hose orifice (m²); The conversion relationship between mass and amount of gas substance is: （6） in, m is the gas mass (kg), n is the amount of substance in the air in the hose (mol), M is the molar mass of air (kg / mol); The volume calculation formula of the metal hose is: （7） Combining formulas (2)-(7) to obtain the deflation time The calculation formula is: ； from ( ) Points to ( )have ； in is the amount of air in the metal hose after deflation (mol), is the amount of air in the metal hose under the test pressure (mol), where t is the deflation time (s); Since it takes a certain amount of time for the gas to move in the metal hose, a compensation time is added. , Related to the pipe length l; ； Finally, the deflation time is: （8） When the test box is working in the pressure holding stage of step b, the inflation and deflation times calculated according to formula (1) and formula (8) are verified.

9. The detection method of the automatic detection system for air tightness of a metal hose according to claim 7, characterized in that: During the inflation phase, the timing starts when the value of the pressure sensor in the test box begins to change. After that, if the pressure sensor reading is still lower than the pressure value required for detection, an alarm will sound, indicating that a fault has occurred during the inflation phase.

10. The detection method of the automatic detection system for air tightness of a metal hose according to claim 7, characterized in that: During the deflation phase, the timing starts when the deflation solenoid valve opens. After that, the reading of the pressure sensor is collected. If the reading at this time is the same as the atmospheric pressure or the error is within the rated safety range, the next step is carried out. If the reading at this time is outside the rated safety range, an alarm is issued to indicate that a fault has occurred during the deflation stage.

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