An air tightness testing device for a quick connector of an automobile pipeline

Abstract

The present application relates to the technical fields of pipeline joint testing, in particular to a kind of air tightness testing device of automobile pipeline quick connector.It includes testing mechanism, the testing mechanism includes rotation setting in the top of test table and is connected with compressed air source gas conveying tank;Testing mechanism also includes pressure sensor, sensor carrier, control valve and multiple gas conveying channels;The one end of the gas conveying channel is communicated with the inside of gas conveying tank, and the other end is communicated with the sealing assembly for the sealing of the both ends of joint body, for the gas in the gas conveying tank is delivered to the inside of joint body;The air tightness testing device of the automobile pipeline quick connector in the application, after one-way valve opens, the space inside detection pipe, gas conveying hole and joint body is interconnected, so that the pressure value detected by pressure sensor corresponds to the pressure value inside joint body, then utilize the mode of rotation to detect multiple joint bodies, to realize the full use of single pressure sensor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe joint testing, in particular to an air tightness testing device for a quick plug joint of an automobile pipe. BACKGROUND

[0002] The quick plug joint of an automobile pipe is a quick connection device for automobile fluid pipes (such as fuel, coolant, brake fluid, air conditioning refrigerant, etc.), and its core feature is that it can quickly complete the connection or disconnection of the pipe without the aid of tools, greatly improving the installation and maintenance efficiency. The quick plug joint usually adopts buckle, locking ring and other designs, and is automatically locked when inserted, and can be separated by pressing the release button, saving the tightening step of the traditional threaded joint. Moreover, the joint has an O-shaped sealing ring or special sealing structure built-in to ensure no leakage in high-pressure and high-temperature environments (such as fuel systems).

[0003] In order to avoid the occurrence of air leakage, oil leakage and other phenomena in the joint, the air tightness of the connected joint is currently tested. During testing, the two ends of the joint are sealed, then the inside of the joint is inflated to form high pressure, and finally the pressure value inside the joint is detected by a pressure sensor, and the change in the value is used to determine whether the joint leaks.

[0004] In related technologies, a multi-station ball air tightness testing device is disclosed in Chinese Patent No. CN112113720A, which improves the efficiency of air tightness testing by setting multiple stations. It can be found that this patent provides a pressure sensor for each station, but this approach increases the cost of the testing device and does not fully utilize the single pressure sensor.

[0005] That is, how to use a small number of pressure sensors to achieve multi-station air tightness testing is an important problem currently faced. SUMMARY

[0006] The present application aims to provide an air tightness testing device for a quick plug joint of an automobile pipe, which cooperates with multiple one-way valves through a single pressure sensor to detect multiple stations, thereby solving the problems raised in the background art, i.e.:

[0007] Each station is equipped with a separate pressure sensor, but this approach increases the cost of the testing device and does not fully utilize the single pressure sensor.

[0008] In order to achieve the above object, the air tightness testing device of the automobile pipeline quick connector comprises a testing mechanism, the testing mechanism comprises a gas conveying tank which is rotatably arranged on the top of a testing table and connected with a compressed air source; the testing mechanism further comprises a pressure sensor, a sensor carrier, a control valve and a plurality of gas conveying channels;

[0009] One end of the gas conveying channel is in communication with the inside of the gas conveying tank, and the other end is in communication with a sealing assembly used for sealing the two ends of the connector body, so as to convey the gas in the gas conveying tank to the inside of the connector body.

[0010] The control valve is used for closing the gas conveying channel after the inside of the connector body is filled with air.

[0011] One side of the gas conveying channel is in communication with a one-way valve used for preventing the gas from being discharged.

[0012] The sensor carrier comprises a detection tube which is sealed at one end, and the pressure sensor is arranged in the inside of the detection tube; when the one-way valve moves to the lower side of the detection tube, the open end of the detection tube drives the one-way valve to be extruded, so that the inside of the detection tube, the gas conveying channel and the connector body are in communication.

[0013] In the above technical solution, the connector body is driven in a rotating manner, so that each connector body can move to the lower side of the pressure sensor and be sealed in one direction by the one-way valve, and the time consumed in the rotating process is just the waiting time after the connector body is filled with air, so that the inside pressure of the connector body can be detected by opening the one-way valve when rotating to the detection position.

[0014] On this basis, the gas conveying channel comprises a slide rod which is slidably inserted into the inside of the gas conveying tank, an air inlet is arranged on the outer ring of one end of the slide rod which is inserted into the gas conveying tank, and a gas conveying hole in communication with the air inlet is arranged on the other end; the control valve is arranged in the gas conveying hole; a communication pipe is in communication with the top of the slide rod, and the one-way valve is arranged at the top end of the communication pipe.

[0015] The sealing assembly comprises a first sealing member and a second sealing member used for sealing the end of the connector body away from the slide rod; the first sealing member comprises a first rubber ring which is sleeved on the outer ring of the slide rod and a through pipe which is fixed on the side wall of the gas conveying tank; one end of the first rubber ring abuts against the end of the through pipe, and the other end abuts against the end of the slide rod; the bottom of the slide rod is connected with a driving member used for driving the displacement of the slide rod.

[0016] In this technical solution, on the one hand, the first sealing member and the gas conveying channel are combined, so that the gas can be conveyed to the inside of the connector body; on the other hand, the rapid sealing and fixing of the connector body are realized, the first sealing member and the gas conveying channel form a mechanism, and the integration degree of the mechanism between the gas conveying and the sealing is improved.

[0017] Further, the bottom end of the detection tube is provided with an annular rubber member, and a pressing rod is fixedly arranged in the rubber member and flush with the bottom end of the rubber member; the testing mechanism further comprises a lifting mechanism for driving the detection tube to move up and down, and the detection tube is located above the one-way valve.

[0018] In this technical solution, the rubber member can further move the detection tube downward, so that the pressing rod acts on the one-way valve to open the one-way valve, thereby realizing the internal communication of the detection tube, the gas conveying channel and the joint body.

[0019] In another technical solution, the second sealing member comprises a piston cylinder and a supporting rod fixedly arranged at the inner end of the piston cylinder, one end of the supporting rod protrudes from one end of the piston cylinder, and the outer ring of the supporting rod is sleeved with a piston tube and a second rubber ring; one end of the second rubber ring abuts against the end of the piston tube, and the other end abuts against the protruding end of the supporting rod; and a hose is further arranged, one end of the hose is communicated with the gas conveying hole, and the other end is communicated with the inner part of the piston cylinder.

[0020] The testing mechanism is arranged in a non-horizontal state; the testing mechanism further comprises an induction sensor, and when the second rubber ring is separated from the joint body, the cross rod passes directly below the induction sensor.

[0021] In this technical solution, since the internal gas pressure of the joint body is consistent with the gas pressure in the piston cylinder, when the joint body leaks, the second rubber ring will automatically separate from the joint body; thus, under the action of inclination, the cross rod is forced to move, thereby providing a signal for the induction sensor to skip the detection of the corresponding joint body.

[0022] Compared with the prior art, the beneficial effects of the present application are:

[0023] 1. In the air tightness testing device of the automobile pipeline quick plug joint, after the one-way valve is opened, the spaces inside the detection tube, the gas conveying hole and the joint body are communicated with each other, so that the pressure value detected by the pressure sensor corresponds to the pressure value inside the joint body, and then the plurality of joint bodies are detected by rotating, thereby realizing the full utilization of a single pressure sensor.

[0024] 2. In the air tightness testing device of the automobile pipeline quick plug joint, by means of the inclined design of the testing mechanism and the sealing mode of the second rubber ring to one end of the joint body, when the joint body leaks, the second rubber ring automatically cancels the connection with one end of the joint body, and at the same time, the cross rod enters the detection range of the induction sensor, so that the joint body does not need to be detected, thereby further improving the efficiency of the air tightness detection. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0026] Figure 2Structure diagram of the testing mechanism of the present application Figure 1 ;

[0027] Figure 3 Structure diagram of the cross section of the gas delivery box of the present application

[0028] Figure 4 Structure diagram of the cross section of the sealing assembly of the present application Figure 1 ;

[0029] Figure 5 Structure diagram of the cross section of the sealing assembly of the present application Figure 2 ;

[0030] Figure 6 Structure diagram of the sensor carrier of the present application Figure 1 ;

[0031] Figure 7 Structure diagram of the sensor carrier of the present application Figure 2 ;

[0032] Figure 8 Structure diagram of the A part of the testing mechanism of the present application Figure 7 ;

[0033] Figure 9 Structure diagram of the substrate of the present application

[0034] Figure 10 Structure diagram of the moving state of the slide bar of the present application

[0035] Figure 11 Structure diagram of the testing mechanism of the present application Figure 2 ;

[0036] Figure 12 Structure diagram of the inductive sensor of the present application

[0037] The meanings of the various reference numerals in the drawings are as follows:

[0038] 100, test table; 101, display; 102, gas delivery pipe; 110, test mechanism; 111, gas delivery tank; 112, base plate; 113, motor; 114, through pipe; 120, sealing assembly; 121, slide rod; 122, first rubber ring; 123, gas delivery hole; 124, gas inlet; 125, communication pipe; 126, one-way valve; 130, piston cylinder; 131, support rod; 132, piston pipe; 133, second rubber ring; 134, hose; 135, cross rod; 136, support plate; 140, sealing ring; 150, sensor carrier; 151, detection pipe; 152, pressure sensor; 153, pressure rod; 154, connecting rod; 155, air cylinder; 156, rubber part; 160, valve body; 161, valve plate; 162, spring; 170, release groove; 171, sealing groove; 172, inflation groove; 173, guide rod; 180, inductive sensor; 200, joint body. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0040] In order to solve the problems of cost increase and insufficient use of a single pressure sensor 152 caused by equipping each station with a pressure sensor 152, the present application provides a gas tightness testing device for a quick plug joint of an automobile pipeline, as shown in Figure 1 The gas tightness testing device comprises a test mechanism 110 arranged on the top of a test table 100, and the test mechanism 110 comprises a gas delivery tank 111, as shown in Figure 2 The gas delivery tank 111 is in a circular structure, and the top of the gas delivery tank 111 is provided with a gas inlet, which is rotatably connected to one end of a gas delivery pipe 102 in Figure 1 The other end of the gas delivery pipe 102 is connected to a gas pressure pump (not shown in the figure), and the compressed gas in the gas pressure pump enters the gas delivery tank 111 through the gas delivery pipe 102. In addition, the bottom of the gas delivery tank 111 is connected to a motor 113 in Figure 3 The motor 113 is installed at the bottom of the test table 100 in Figure 1 , and is used to drive the rotation of the gas delivery tank 111.

[0041] In Figure 2In the test mechanism 110, the pressure sensor 152, the sensor carrier 150, the control valve, and a plurality of gas delivery channels arranged on the outer wall of the gas tank 111 are further included; one end of the gas delivery channel is in communication with the inside of the gas tank 111, and the other end is in communication with the sealing assembly 120 used for sealing the two ends of the joint body 200, so as to deliver the gas in the gas tank 111 to the inside of the joint body 200; the control valve is used to disconnect the gas delivery channel from the gas tank 111 after the inflation in the joint body 200 is completed; and one side of the gas delivery channel is in communication with the one-way valve 126 used for preventing the gas from being discharged.

[0042] As shown in Figure 6 , the sensor carrier 150 includes a detection tube 151 sealed at one end, and the open end of the detection tube 151 is arranged corresponding to the one-way valve 126 and located above the one-way valve 126, and the pressure sensor 152 is arranged inside the detection tube 151; when the one-way valve 126 moves below the detection tube 151, the open end of the detection tube 151 is driven to press the one-way valve 126, so that the detection tube 151 is in communication with the inside of the gas delivery channel, so that the inside of the detection tube 151, the inside of the gas delivery channel, and the inside of the joint body 200 are in communication, and the gas pressures among them are consistent, at this time, the data detected by the pressure sensor 152 is the pressure data in the joint body 200.

[0043] In the above, the pressure sensor 152 is connected with the display 101 in Figure 1 , so as to output the pressure value through the display 101 for the staff to check.

[0044] As shown in Figure 4 , the gas delivery channel includes a sliding rod 121 slidingly penetrating into the inside of the gas tank 111, the outer wall of one end of the sliding rod 121 is provided with an air inlet 124, and the other end is provided with a gas delivery hole 123 in communication with the air inlet 124; the control valve is arranged in the gas delivery hole 123; the top of the sliding rod 121 is in communication with a communication pipe 125, and the one-way valve 126 is arranged at the top end of the communication pipe 125.

[0045] The sealing assembly 120 includes a first sealing member and a second sealing member; the first sealing member includes a first rubber ring 122 sleeved on the outer wall of the sliding rod 121 and a through pipe 114, wherein one end of the through pipe 114 is fixedly connected with the side wall of the gas tank 111, and the other end is abutted with one end of the first rubber ring 122; the other end of the first rubber ring 122 is abutted against the end of the sliding rod 121. In addition, the bottom of the sliding rod 121 is connected with a driving member used for driving the displacement of the sliding rod 121, and in the embodiment, the driving member can be a hydraulic cylinder, an electric push rod or the like. Then, the second sealing member is used for sealing the end of the joint body 200 away from the sliding rod 121. In the embodiment, the second sealing member can be an air bag or a rubber block matched with the inner diameter of the joint body 200.

[0046] In implementation, referring to Figure 4 , the slide rod 121 is expanded outwardly at one end away from the gas delivery tank 111 to form a protrusion. In this way, one end of the first rubber ring 122 can be rested against the side wall of the protrusion, and thus will not slide out of the end of the slide rod 121 directly. Here, the outer diameters of the slide rod 121, the first rubber ring 122 and the outer ring of the through pipe 114 are all smaller than the inner diameter of the end of the joint body 200. At this time, by inserting one end of the joint body 200 into one end of the slide rod 121, and then driving the slide rod 121 to move towards the through pipe 114 by the hydraulic cylinder, at this time, the slide rod 121 extrudes the first rubber ring 122 to deform outwardly, thereby sealing one end of the joint body 200. Then, by inserting the appropriate rubber block into the other end of the joint body 200, sealing of both ends of the joint body 200 can be achieved at this time.

[0047] As shown in Figure 6 , the inside of the detection pipe 151 is fixedly provided with a pressing rod 153, and as shown in Figure 8 , the bottom end of the detection pipe 151 is provided with an annular rubber piece 156, and here, the bottom end of the pressing rod 153 is flush with the bottom end of the rubber piece 156.

[0048] In implementation, as shown in Figure 6 and Figure 7 , the outer ring of the detection pipe 151 is fixedly connected with a connecting rod 154, one end of the connecting rod 154 is connected with a gas cylinder 155, and the gas cylinder 155 is arranged on the top of the test bench 100. Figure 1 At this time, by driving the connecting rod 154 to descend by the gas cylinder 155, the connecting rod 154 drives the detection pipe 151 to descend, and when the bottom end of the rubber piece 156 is rested against the top end of the communication pipe 125, the detection pipe 151 is sealed with the communication pipe 125 by the rubber piece 156 at this time. Then, continue to drive the detection pipe 151 to descend, at this time the rubber piece 156 starts to deform, and at the same time, the pressing rod 153 moves downward to open the one-way valve 126, and at this time the gas in the communication pipe 125 can flow into the detection pipe 151.

[0049] That is to say, after the one-way valve 126 is opened, the space inside the detection pipe 151, the gas delivery hole 123 and the joint body 200 are connected with each other, so that the pressure value detected by the pressure sensor 152 corresponds to the pressure value inside the joint body 200, and then the multiple joint bodies 200 are detected in a rotating manner, thereby achieving full utilization of the single pressure sensor 152.

[0050] The test process of the present application is described in detail below.

[0051] First, one end of the joint body 200 is inserted into the outer ring of the slide rod 121, and then the slide rod 121 is driven to move towards the tube 114, and the first rubber ring 122 is extruded by the slide rod 121 during the movement, so that the first rubber ring 122 is deformed outward to seal one end of the joint body 200, and then the other end of the joint body 200 is sealed by the air bag or rubber block (or the other end of the joint body 200 is sealed in advance).

[0052] Then, the intake port 124 is opened by the control valve, at this time the compressed gas in the gas tank 111 enters the inside of the joint body 200 through the intake port 124 and the gas supply hole 123, when the gas pressure in the joint body 200 is consistent with the gas pressure in the gas tank 111, the intake port 124 is closed by the control valve.

[0053] Then, the gas tank 111 is driven to rotate by the motor 113, at the same time, the joint body 200 is also driven to rotate by the gas tank 111, when the one-way valve 126 at the top of the gas tank 111 rotates to the position directly below the detection tube 151, the detection tube 151 is driven to move downward by the cylinder 155, and the detection tube 151 is further deformed by extruding the rubber part 156 to move downward, the detection tube 151 drives the one-way valve 126 to open by the pressure rod 153, at this time the gas in the communication tube 125 flows into the detection tube 151, and then the gas pressure in the detection tube 151 is detected by the pressure sensor 152.

[0054] In this process, the gas pressure in the gas tank 111 is pre-set, for example, the gas pressure in the gas tank 111 is 100kPa (kiloPascal), after part of the gas in the gas tank 111 flows into the inside of the joint body 200 through the gas supply hole 123, the gas pressure in the gas tank 111 is further increased to 100kPa by the gas pressure pump, at this time the gas pressure in the joint body 200 is also 100kPa. And when the control valve is closed, the gas pressures in the communication tube 125, the gas supply hole 123 and the joint body 200 are still 100kPa. Then, when the one-way valve 126 is opened, the gas in the communication tube 125 flows into the detection tube 151, assuming that at this time the pressure in the joint body 200 drops to 95kPa, at this time, if the pressure sensor 152 detects that the pressure value in the detection tube 151 is lower than 95kPa, it indicates that the joint body 200 has a gas leakage phenomenon.

[0055] Figure 8The specific structure of the one-way valve 126 is shown in the figure. The one-way valve 126 includes a valve body 160 fixedly disposed on the inner wall of the connecting pipe 125 and a valve plate 161 disposed within the valve body 160. A spring 162 elastically connects the bottom of the valve plate 161 and the valve body 160. Meanwhile, the top of the valve body 160 has an opening with a diameter smaller than that of the valve plate 161. The valve plate 161 rests against the lower part of the opening due to the elasticity of the spring 162. Thus, when the pressure rod 153 presses the valve plate 161 downwards, the valve plate 161 opens the opening, allowing gas in the connecting pipe 125 to flow into the detection pipe 151 through the valve body 160 and the opening.

[0056] It should be noted that the bottom of the valve body 160 is provided with holes to allow gas to pass through.

[0057] In another embodiment, such as Figure 4 As shown, the second sealing element includes a piston cylinder 130 and a support rod 131 fixedly disposed at the inner end of the piston cylinder 130. One end of the support rod 131 protrudes from one end of the piston cylinder 130, and a piston tube 132 and a second rubber ring 133 are sleeved on the outer ring of the support rod 131; wherein, the second rubber ring 133 is located between the piston tube 132 and the protruding end of the support rod 131. Furthermore, as... Figure 5 As shown, the second seal also includes a hose 134 with one end connected to the air inlet 123 and the other end connected to the inside of the piston cylinder 130.

[0058] In practice, the outer ring of the protruding end of the support rod 131 (i.e., the end facing the connector body 200) is expanded outward to form a protrusion. At this time, one end of the second rubber ring 133 abuts against the side wall of the protrusion, and the other end abuts against the end of the piston tube 132. Then, the part where the hose 134 connects to the piston cylinder 130 is close to the closed end of the piston cylinder 130. At the same time, the outer ring diameter of the support rod 131, the outer ring diameter of the second rubber ring 133, and the outer ring diameter of the piston tube 132 are all smaller than the inner diameter of the end of the connector body 200. In addition, the diameter of the end of the air inlet 123 near the slide rod 121 is reduced, so that the diameter of the end of the air inlet 123 near the air box 111 is larger than the diameter of the other end.

[0059] In this way, the protruding end of the support rod 131 is first inserted into the interior of one end of the connector body 200. When the gas in the gas supply box 111 enters the gas supply port 123, due to the narrowing of the end of the gas supply port 123, most of the gas in the gas supply port 123 flows into the hose 134, and then enters the piston cylinder 130 to drive the piston tube 132 to move. The piston tube 132 moves towards the connector body 200, squeezing the second rubber ring 133, causing the second rubber ring 133 to deform outward and seal one end of the connector body 200. After sealing, the gas in the gas supply port 123 enters the interior of the connector body 200, inflating the interior of the connector body 200.

[0060] In addition, in order to achieve the placement of the piston cylinder 130, such as Figure 5 As shown, a crossbar 135 is fixedly connected to one end of the support rod 131 away from the connector body 200, and a support plate 136 is slidably connected to one end of the crossbar 135. One end of the support plate 136 is fixedly set on the outer ring of the gas box 111.

[0061] Since multiple connector bodies 200 can be placed around the outer ring of the gas delivery box 111, it is difficult to practically equip each slide bar 121 with a separate drive and control valve. Therefore, this invention discloses an alternative structure for the drive and control valve:

[0062] like Figure 9 and Figure 10 As shown, the driving component includes a base plate 112 and a guide rod 173 fixedly disposed at the bottom of the slide bar 121; the base plate 112 is disposed on... Figure 2 The bottom of the intermediate gas delivery box 111 is rotatably connected to the gas delivery box 111; the top of the base plate 112 is provided with an annular guide groove, and the bottom end of the guide rod 173 extends into the guide groove to drive the slide rod 121 to reciprocate under the guidance of the guide groove. The control valve includes a sealing ring 140 that is slidably sleeved on the outer ring of the slide rod 121, and the sealing ring 140 is fixedly installed on the top inner wall of the gas delivery box 111; under normal conditions, the sealing ring 140 seals the air inlet 124.

[0063] Specifically, the guide groove can be divided into three parts, such as Figure 9 As shown, these are the release groove 170, the sealing groove 171, and the inflation groove 172. Here, Figure 9 The text uses shading of varying densities to aid understanding. The two ends of the release groove 170 are connected to the two ends of the sealing groove 171 (which can be understood as being connected end-to-end), and the inflation groove 172 is positioned in the middle of the sealing groove 171. Furthermore, the diameter of the release groove 170 is larger than the diameter of the sealing groove 171, and the diameter of the sealing groove 171 is larger than the diameter of the inflation groove 172.

[0064] Working principle:

[0065] When placing the connector body 200, refer to Figure 5 First, push the piston cylinder 130 toward the crossbar 135 so that the distance between the support rod 131 and the slide rod 121 is greater than the length of the connector body 200. Then, insert one end of the connector body 200 into the outer ring of the slide rod 121 and insert the support rod 131 into the interior of the other end of the connector body 200.

[0066] Then, combine Figure 9 and Figure 10 When the guide rod 173 is in the release groove 170, the state of the slide rod 121 is as follows: Figure 10As shown at the top, the hose 134 is currently positioned within the inner ring of the sealing ring 140, preventing gas from entering the gas delivery box 111. Simultaneously, the slide rod 121 does not compress the gas delivery port 123, meaning the connector body 200 is not sealed or secured at this time. In other words, when the guide rod 173 rotates into the release groove 170, the tested connector body 200 can be removed from the outer ring of the slide rod 121, or an untested connector body 200 can be placed into the outer ring of the slide rod 121.

[0067] When the guide rod 173 is inside the sealing groove 171, the state of the slide rod 121 is as follows: Figure 10 As shown in the middle part, the slide bar 121 moves toward the air supply box 111. The slide bar 121 moves and squeezes the air supply hole 123 to deform and seal and fix one end of the connector body 200; but at this time the air inlet 124 has not disengaged from the sealing ring 140.

[0068] When the guide rod 173 is inside the inflation groove 172, the state of the slide rod 121 is as follows: Figure 10 As shown in the bottom part, the slide rod 121 moves further towards the air supply box 111, while the air supply port 123 continues to deform to support the further movement of the slide rod 121. At the same time, the air inlet 124 disengages from the sealing ring 140, and the gas in the air supply box 111 enters the air supply port 123 through the air inlet 124, and then is discharged into the interior of the connector body 200 and the piston cylinder 130. At this time, the piston tube 132 compresses the second rubber ring 133 to deform and seal the other end of the connector body 200, and then inflates the connector body 200.

[0069] The location of pressure sensor 152 in the above description can be referenced. Figure 12 Location, Figure 12 The pressure sensor 152 is positioned corresponding to the sealing groove 171. That is, when the guide rod 173 is in the sealing groove 171, both ends of the connector body 200 are sealed by the first rubber ring 122 and the second rubber ring 133 respectively, and only then can the airtightness test be performed.

[0070] Furthermore, in another embodiment, reference Figure 11 Set the test mechanism 110 to an inclined or vertical non-horizontal state. Then, refer to... Figure 12 One side of connecting rod 154 ( Figure 12 A sensing sensor 180 is provided on the left side of the connecting rod 154. The sensing sensor 180 is preferably a photoelectric sensor. When the second rubber ring 133 disengages from the connector body 200, the crossbar 135 passes directly below the sensing sensor 180.

[0071] For details, please refer to Figure 12, the dashed line in the figure is the demarcation line. When the piston cylinder 130 is below the dashed line, the piston cylinder 130 will be subjected to the gravity force sliding to the cross rod 135. However, it can be divided into two cases as follows:

[0072] When the joint body 200 is not leaked, the air pressure in the joint body 200 can push the piston tube 132 to deform the second rubber ring 133, and in this state, the second rubber ring 133 continues to seal one end of the joint body 200; due to the friction between the second rubber ring 133 and the joint body 200, the piston cylinder 130 will not displace, so that the inductive sensor 180 cannot detect the cross rod 135.

[0073] When the joint body 200 is leaked, the air pressure in the joint body 200 gradually decreases, and the air pressure in the piston cylinder 130 also gradually decreases, so that the extrusion force on the second rubber ring 133 decreases. When the elasticity of the second rubber ring 133 overcomes the pushing force of the piston cylinder 130 on the piston tube 132, the second rubber ring 133 recovers, thereby canceling the sealing of one end of the joint body 200. At this time, the second rubber ring 133 is in a non-contact state with the joint body 200. Therefore, under the action of gravity, the piston cylinder 130 drives the cross rod 135 to move downward, so that the cross rod 135 rotates to form a larger diameter. In this way, when the cross rod 135 passes through the inductive sensor 180, the inductive sensor 180 can detect the presence of the cross rod 135, and the second rubber ring 133 can continue to drive the gas tank 111 to rotate, so that the joint body 200 corresponding to the cross rod 135 directly passes through the pressure sensor 152 without stopping for detection.

[0074] For example, Figure 12 As shown in the figure, six stations are shown, so the motor 113 drives the gas tank 111 to stop every 60 degrees, and at this time the communication pipe 125 is located directly below the detection pipe 151. Then, when the inductive sensor 180 detects the cross rod 135, the gas tank 111 will not stop after rotating 60 degrees, but will directly rotate the sealing assembly 120 degrees to skip the detection of the leaked joint body 200.

[0075] Therefore, by tilting the test mechanism 110 and combining the sealing mode of the second rubber ring 133 to one end of the joint body 200, when the joint body 200 is leaked, the second rubber ring 133 automatically cancels the connection with one end of the joint body 200, and the cross rod 135 enters the detection range of the inductive sensor 180, so that the joint body 200 does not need to be detected, thereby further improving the efficiency of the air tightness detection.

[0076] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An airtightness testing device for automotive pipeline quick-connect fittings, comprising a testing mechanism (110), wherein the testing mechanism (110) includes an air supply box (111) rotatably mounted on the top of a test bench (100) and connected to a compressed air source; characterized in that: The testing unit (110) also includes a pressure sensor (152), a sensor carrier (150), a control valve, and multiple gas delivery channels; One end of the gas delivery channel is connected to the inside of the gas delivery box (111), and the other end is connected to a sealing assembly (120) for sealing both ends of the connector body (200), so as to deliver the gas in the gas delivery box (111) to the inside of the connector body (200). The control valve is used to close the gas supply channel after the gas filling is completed inside the connector body (200); One side of the gas delivery channel is connected to a one-way valve (126) to prevent gas from escaping. The sensor carrier (150) includes a detection tube (151) sealed at one end, and the pressure sensor (152) is disposed inside the detection tube (151). When the one-way valve (126) moves to the bottom of the detection tube (151), it drives the open end of the detection tube (151) to squeeze the one-way valve (126) so that the internal parts of the detection tube (151), the gas supply channel and the connector body (200) are connected. The gas delivery channel includes a slide rod (121) that slides into the gas delivery box (111) at one end. The outer ring of the slide rod (121) that is inserted into the gas delivery box (111) is provided with an air inlet (124), and the other end is provided with a gas delivery hole (123) that communicates with the air inlet (124). The control valve is located inside the gas inlet (123); The top of the slide bar (121) is connected to a connecting pipe (125), and the one-way valve (126) is located at the top of the connecting pipe (125); The sealing assembly (120) includes a first seal and a second seal for sealing the end of the connector body (200) away from the slide bar (121); The first sealing element includes a first rubber ring (122) sleeved on the outer ring of the slide rod (121) and a through pipe (114), the through pipe (114) being fixed to the side wall of the gas delivery box (111); one end of the first rubber ring (122) abuts against the end of the through pipe (114) and the other end abuts against the end of the slide rod (121); The bottom of the slide bar (121) is connected to a driving component for driving the slide bar (121) to move; The second sealing element is a rubber block that is adapted to the inner diameter of the connector body 200; The one-way valve (126) includes a valve body (160) fixedly disposed on the inner wall of the connecting pipe (125) and a valve plate (161) disposed in the valve body (160). The valve plate (161) and the valve body (160) are elastically connected by an elastic element, and the valve plate (161) rests against the bottom of the top opening of the valve body (160).

2. The airtightness testing device for automotive pipeline quick-connect fittings according to claim 1, characterized in that: The bottom end of the detection tube (151) is provided with an annular rubber part (156), and a pressure rod (153) flush with the bottom end of the rubber part (156) is fixedly provided inside. The testing mechanism (110) also includes a lifting mechanism for driving the detection tube (151) to move up and down, the detection tube (151) being located above the one-way valve (126).

3. The airtightness testing device for automotive pipeline quick-connect fittings according to claim 1, characterized in that: The driving component includes a base plate (112) and a guide rod (173) fixedly disposed at the bottom of the slide rod (121); the base plate (112) is rotatably disposed at the bottom of the gas delivery box (111), and an annular guide groove is provided on the top of the base plate (112). The bottom end of the guide rod (173) extends into the guide groove so as to drive the slide rod (121) to reciprocate under the guidance of the guide groove; The control valve includes a sealing ring (140) that is slidably sleeved on the outer ring of the slide rod (121), and the sealing ring (140) is fixedly installed on the top inner wall of the gas delivery box (111).

4. The airtightness testing device for automotive pipeline quick-connect fittings according to claim 3, characterized in that: The guide groove includes a release groove (170), a sealing groove (171), and an inflation groove (172); the two ends of the release groove (170) are connected to the two ends of the sealing groove (171), and the inflation groove (172) is located in the middle of the sealing groove (171). The diameter of the release groove (170) is larger than the diameter of the sealing groove (171), and the diameter of the sealing groove (171) is larger than the diameter of the inflation groove (172).

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