Automobile manifold air tightness detection device

Abstract

The invention, which relates to the technical field of automobile manifold processing, discloses an automobile manifold airtightness detection device comprising a detection bench provided with a positioning module used for positioning an automobile manifold. The automobile manifold comprises a main air pipe, and the main air pipe communicates with a plurality of branch air pipes. A blocking module and a first gas transmission module are arranged on the detection table, the blocking module is used for blocking the orifice of the branch gas pipe, and the first gas transmission module is used for inputting nitric oxide gas into the main gas pipe; wherein a sealing box is further arranged on the detection table, an opening is formed in the direction, facing the detection table, of the sealing box, a lifting module is arranged on the detection table, and the lifting module is used for driving the sealing box to ascend and descend; according to the detection method, the leakage point can be positioned, and in the detection process, detection liquid cannot be attached to the automobile manifold, so that subsequent cleaning and drying treatment is not needed, the detection precision and efficiency are effectively improved, and batch production of the automobile manifold is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive manifold processing, and particularly relates to an airtightness detection device for automotive manifolds. Background Art

[0002] Automotive manifolds are key components in engines, including intake manifolds and exhaust manifolds, which have important effects on the performance and efficiency of engines. The intake manifold is mainly responsible for evenly distributing air or a mixture of air and fuel to each cylinder to ensure the smooth operation of the engine. Its design affects intake efficiency, combustion effect, and power output. The exhaust manifold collects the exhaust gases discharged from each cylinder, guides them to the exhaust pipe and muffler, and finally discharges them into the atmosphere. The design needs to consider exhaust efficiency, noise control, and heat management.

[0003] The airtightness detection method for the intake manifold includes the differential pressure detection method. Using a COSMO airtightness detector, the airtightness of the workpiece is detected by the differential pressure detection method, which can accurately judge the airtightness of the intake manifold, but it is difficult to judge the number and location of air leakage points. In the prior art, for example, the application document with the publication number CN118857580A discloses an airtightness detection device for an intake manifold. By setting a liquid inlet pipe and an air inlet pipe, the pipe orifice position of the intake manifold is sealed, and only the liquid is discharged into the interior of the intake manifold through the main pipe plug. When the interior of the intake manifold is filled with liquid, the interior of the air inlet pipe starts to be inflated, and the gas continuously enters the interior of the intake manifold. At this time, the internal pressure of the intake manifold increases, and the liquid will be discharged from the damaged part of the intake manifold. Through the air-liquid mixing method, it is easier for the staff to observe the bubbles, and the intake manifold is completely exposed to the air, which is also convenient for the staff to mark the damaged parts on the surface of the intake manifold.

[0004] It can be seen that the prior art uses the air-liquid mixing method to detect air leakage points. However, in the actual application process, since each automotive manifold produced needs to be subjected to airtightness detection, after the detection using the prior art method, the detection liquid will adhere to the wall of the automotive manifold. Therefore, it is necessary to remove the detection liquid to avoid affecting the next step of processing. This detection method undoubtedly reduces the mass production process. Summary of the Invention

[0005] The purpose of the present invention is to provide an airtightness detection device for automotive manifolds to solve the following technical problems:

[0006] The prior art uses the air-liquid mixing method to detect automotive manifolds. After the detection, it is also necessary to remove the detection liquid on the pipe wall, which affects the processing process.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] An airtightness detection device for an automotive manifold, comprising a detection table, on which a positioning module is provided for positioning the automotive manifold;

[0009] The automotive manifold includes a main air pipe, and the main air pipe is respectively communicated with a plurality of groups of branch air pipes; a plugging module and a first air supply module are provided on the detection table, the plugging module is used for plugging the pipe orifices of the branch air pipes, and the first air supply module is used for inputting nitric oxide gas into the main air pipe;

[0010] Wherein, a sealing box is further provided on the detection table, an opening is formed in the direction of the detection table on the sealing box, a lifting module is provided on the detection table, the lifting module is used for driving the sealing box to lift, and a second air supply module is provided on the sealing box, and the second air supply module is used for inputting oxygen into the sealing box.

[0011] Preferably, a first positioning plate is fixedly arranged at the pipe orifice of the main air pipe far from the branch air pipe, a plurality of groups of first positioning holes are formed in the first positioning plate, a second positioning plate is fixedly arranged at the pipe orifice of the branch air pipe far from the main air pipe, and a plurality of groups of second positioning holes are formed in the second positioning plate.

[0012] Preferably, the positioning module includes a positioning groove formed on the detection table for embedding the first positioning plate, a bearing plate is fixedly arranged in the positioning groove, and a through groove is formed in the bearing plate.

[0013] Preferably, the plugging module includes a plurality of groups of first air pipe plugs arranged on the detection table, and the positions of the first air pipe plugs respectively correspond to the positions of the branch air pipes;

[0014] Wherein, a driving part is provided on the detection table, and the driving part is used for driving each first air pipe plug to approach or move away from the branch air pipe.

[0015] Preferably, a second air pipe plug is further arranged at the bottom of the detection table, and the second air pipe plug is connected with a lifting part for driving its lifting.

[0016] Preferably, the lifting part includes a guide rod fixed on the detection table, each first air pipe plug is respectively fixed with a positioning plate through an elastic module, a positioning frame fixed with the positioning plate is slidably sleeved on the guide rod, a first spring is arranged on the guide rod, a first inclined plate is fixedly arranged on the positioning plate, and the first inclined plate is inclined towards the direction of the first air pipe plug;

[0017] Wherein, a first guide wheel for rolling abutting against the first inclined plate is rotatably arranged in the sealing box.

[0018] Preferably, a plurality of groups of first positioning rods corresponding to the first positioning holes one by one are fixedly arranged in a circumferential array on the periphery of the second air pipe plug, and the distance between the first positioning rod and the first positioning plate is smaller than the distance between the second air pipe plug and the first positioning plate;

[0019] Wherein, a second positioning rod corresponding to the second positioning hole one by one is fixedly arranged on the periphery of the first tracheal plug, and the distance between the second positioning rod and the second positioning plate is smaller than the distance between the first tracheal plug and the second positioning plate.

[0020] Preferably, the first gas delivery module includes a gas delivery channel opened at the axial center end of the second tracheal plug. A first gas delivery pipe communicated with the gas delivery channel is fixedly arranged at one end of the second tracheal plug far away from the detection table. The other end of the first gas delivery pipe is slidably inserted into the second gas delivery pipe. A first gas storage tank for storing nitric oxide gas is arranged on one side of the detection table. A first air pump is arranged on the first gas storage tank. The first air pump is communicated with the second gas delivery pipe through a third gas delivery pipe.

[0021] Preferably, the lifting part includes guide plates symmetrically fixed on the first gas delivery pipe. A limiting rod is slidably inserted into the guide plates. A second guide wheel is rotatably arranged at the bottom end of the limiting rod. A second spring is arranged on the limiting rod. A plurality of groups of support frames are fixedly arranged at the bottom of the detection table. A horizontal air cylinder is fixedly arranged on one side of the support frames. An adjusting plate is fixedly arranged at the driving end of the horizontal air cylinder. Support plates for supporting the second guide wheel are symmetrically fixedly arranged on both sides of the adjusting plate;

[0022] Wherein, a second inclined plate is fixedly arranged at one end of the support plate far away from the adjusting plate, and the second inclined plate inclines towards the direction close to the detection table.

[0023] Preferably, the second gas delivery module includes a gas delivery box fixed on the sealed box. A gas delivery port communicated with the gas delivery box is opened in the sealed box. The other end of the gas delivery box is connected with a fourth gas delivery pipe. The other end of the fourth gas delivery pipe is connected with a three-way valve. One end of the three-way valve is communicated with a fifth gas delivery pipe. The other end of the fifth gas delivery pipe is connected with a second gas storage tank for storing oxygen through a second air pump. The other end of the three-way valve is communicated with a sixth gas delivery pipe. The other end of the sixth gas delivery pipe is connected with a third gas storage tank through a third air pump;

[0024] Wherein, a fourth air pump for vacuum pumping is further arranged on one side of the sealed box.

[0025] The beneficial effects of the present invention:

[0026] (1) First, place the automotive manifold to be detected on the detection table and position the automotive manifold through the positioning module. After positioning, drive the sealing box to descend through the lifting module and cover it on the detection table to isolate the automotive manifold from the outside air, and then perform a vacuum pumping process on the sealing box. Secondly, block each bronchus through the blocking module. After blocking, input a preset amount of nitric oxide gas into the main air pipe through the first air delivery module. At the same time, input a preset amount of oxygen into the sealing box through the second air delivery module. When any position of the automotive manifold leaks, nitric oxide is discharged from the leakage point and contacts the oxygen, and then reddish-brown nitrogen dioxide gas is generated. The detector can then locate the leakage point. Correspondingly, multiple monitors can be set in the sealing box in the present invention to monitor the automotive manifold. If no reddish-brown gas is generated during the detection process, it indicates that the automotive manifold does not leak. Through the detection method of the present invention, not only can the leakage point be located, but also during the detection process, no detection liquid will adhere to the automotive manifold, so there is no need for subsequent cleaning and drying processes, effectively improving the detection accuracy and efficiency and facilitating the batch production of automotive manifolds;

[0027] (2) When the lifting part of the present invention drives the second air pipe plug to move towards the main air pipe, the first positioning rod first inserts into the first positioning hole to achieve positioning. At this time, the second air pipe plug still does not contact the first positioning plate. Then, drive the sealing box to move towards the detection table through the lifting mechanism, and synchronously drive the first air pipe plug to move during the movement. The first air pipe plug drives the second positioning rod to insert into the second positioning hole to achieve the effect of repositioning the automotive manifold. At the same time, since the first positioning rod is in the state of inserting into the first positioning hole at this time, the horizontal positioning of the automotive manifold can be achieved. When the first air pipe plug is engaged with the main air pipe, it will not push the automotive manifold to shift horizontally; finally, the lifting part can be used to drive the second air pipe plug to continue moving towards the main air pipe. Since the second positioning rod is in the state of inserting into the second positioning hole, when the second air pipe plug is engaged with the main air pipe, there will also be no situation of pushing the automotive manifold to shift vertically, and the stability of the automotive manifold during detection is higher. Description of the Drawings

[0028] The present invention will be further described below in conjunction with the drawings.

[0029] Figure 1 is a structural schematic diagram of an airtightness detection device for an automotive manifold of the present invention Figure 1 ;

[0030] Figure 2 is a structural schematic diagram of an airtightness detection device for an automotive manifold of the present invention Figure 2 ;

[0031] Figure 3It is a schematic structural diagram of a detection table in an airtightness detection device for an automotive manifold according to the present invention;

[0032] Figure 4 It is a schematic structural diagram of a sealing box in an airtightness detection device for an automotive manifold according to the present invention;

[0033] Figure 5 It is a schematic structural diagram of a first gas storage tank in an airtightness detection device for an automotive manifold according to the present invention;

[0034] Figure 6 It is a schematic structural diagram when a second inclined plate moves in an airtightness detection device for an automotive manifold according to the present invention;

[0035] Figure 7 It is a schematic structural diagram of an automotive manifold in an airtightness detection device for an automotive manifold according to the present invention;

[0036] Figure 8 It is a schematic structural diagram of an elastic module in an airtightness detection device for an automotive manifold according to the present invention;

[0037] Figure 9 It is a schematic structural diagram of a positioning groove in an airtightness detection device for an automotive manifold according to the present invention.

[0038] In the figure: 1, detection table; 2, sealing box; 3, automotive manifold; 4, first gas storage tank; 5, horizontal cylinder; 6, first gas transmission pipe; 101, through groove; 102, positioning groove; 103, bearing plate; 104, support frame; 201, lifting mechanism; 202, gas transmission box; 203, fourth gas transmission pipe; 204, three-way valve; 205, fifth gas transmission pipe; 206, sixth gas transmission pipe; 207, first guide wheel; 301, first positioning plate; 302, first positioning hole; 303, bronchus; 304, second positioning hole; 305, second positioning plate; 306, main air pipe; 401, third gas storage tank; 402, second gas storage tank; 403, second air pump; 404, third air pump; 405, first air pump; 406, third gas transmission pipe; 407, second gas transmission pipe; 408, connecting plate; 409, support column; 501, support plate; 502, second inclined plate; 601, second air pipe plug; 602, gas transmission channel; 603, telescopic rod; 604, first positioning rod; 605, guide plate; 606, limiting rod; 607, second spring; 608, second guide wheel; 609, third spring; 610, sleeve; 611, positioning plate; 612, first inclined plate; 613, first air pipe plug; 614, second positioning rod; 615, positioning frame; 616, guide rod; 617, first spring. Detailed implementation manners

[0039] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0040] Embodiment 1

[0041] Please refer to Figures 1-4 As shown, the present invention is an airtightness detection device for an automotive manifold, including a detection table 1, on which a positioning module is provided for positioning the automotive manifold 3;

[0042] It can be referred to Figure 7 , in this embodiment, the automotive manifold 3 includes a main air pipe 306, and the main air pipe 306 is respectively communicated with a plurality of groups of branch air pipes 303; specifically, four groups of branch air pipes 303 are provided in this embodiment, and the specific number of branch air pipes 303 in this embodiment is not limited, as long as the actual application requirements are met.

[0043] A first positioning plate 301 is fixedly arranged at the pipe orifice of the main air pipe 306 away from the branch air pipe 303, and a plurality of groups of first positioning holes 302 are opened on the first positioning plate 301. A second positioning plate 305 is fixedly arranged at the pipe orifice of the branch air pipe 303 away from the main air pipe 306, and a plurality of groups of second positioning holes 304 are opened on the second positioning plate 305; specifically, by providing the first positioning holes 302 and the second positioning holes 304, it is convenient to fix the automotive manifold 3 on the automotive mounting bracket through bolts. Among them, three groups of first positioning holes 302 are opened, and two groups of second positioning holes 304 are opened. The specific number of positioning holes opened in this embodiment is not limited, as long as the installation and positioning requirements of the automotive manifold 3 are met.

[0044] A plugging module and a first gas transmission module are provided on the detection table 1. The plugging module is used for plugging the pipe orifice of the branch air pipe 303, and the first gas transmission module is used for inputting nitric oxide gas into the main air pipe 306;

[0045] Among them, a sealing box 2 is further arranged on the detection table 1. An opening is provided on the sealing box 2 facing the detection table 1. A lifting module is provided on the detection table 1, and the lifting module is used for driving the sealing box 2 to lift. A second gas transmission module is provided on the sealing box 2, and the second gas transmission module is used for inputting oxygen into the sealing box 2; it can be explained that these two colorless gases, nitric oxide and oxygen, will change color when they come into contact; specifically, after nitric oxide reacts with oxygen, red-brown nitrogen dioxide gas can be quickly generated;

[0046] Thus, in this embodiment, first place the automotive manifold 3 to be detected on the detection table 1, and position the automotive manifold 3 through the positioning module. After positioning is completed, drive the sealing box 2 to descend and cover the detection table 1 through the lifting module to isolate the automotive manifold 3 from the outside air, and perform a vacuum pumping process on the sealing box 2. Secondly, block each bronchus 303 through the blocking module. After blocking is completed, input a preset amount of nitric oxide gas into the main pipe 306 through the first gas transmission module. At the same time, input a preset amount of oxygen into the sealing box 2 through the second gas transmission module. When any position of the automotive manifold 3 leaks, nitric oxide is discharged from the leakage point and contacts the oxygen, and then brownish-red nitrogen dioxide gas is generated, and the detection personnel can locate the leakage point. Correspondingly, multiple monitors can be set in the sealing box 2 in this embodiment to monitor the automotive manifold 3. If no brownish-red gas is generated during the detection process, it indicates that the automotive manifold 3 does not leak. Through the detection method of this embodiment, not only can the leakage point be located, but also during the detection process, no detection liquid will adhere to the automotive manifold 3, so there is no need for subsequent cleaning and drying processes, effectively improving the detection accuracy and efficiency, and facilitating the batch production of the automotive manifold 3.

[0047] In addition, when the first gas transmission module of this embodiment inputs nitric oxide gas into the automotive manifold 3 and the second gas transmission module inputs oxygen into the automotive manifold 3, the pressure in the automotive manifold 3 needs to be greater than the pressure in the sealing box 2 to prevent the oxygen in the sealing box 2 from flowing back into the automotive manifold 3 along the leakage point. At the same time, due to the relatively high pressure in the automotive manifold 3, if there is a leakage point, nitric oxide can be quickly discharged and combined with oxygen, and the detection rate is higher. Specifically, the pressure value can be detected by setting pressure sensors at the gas transmission ends of the first gas transmission module and the second gas transmission module. This pressure sensor and the detection means are prior arts, and the specific structure and model of this embodiment are not limited.

[0048] Embodiment 2

[0049] Based on Embodiment 1, please refer to Figure 3 and Figure 9 , the positioning module includes a positioning groove 102 opened on the detection table 1 for embedding the first positioning plate 301 of the automotive manifold 3. A bearing plate 103 is fixedly arranged in the positioning groove 102, and a through groove 101 is opened on the bearing plate 103. Specifically, when positioning the automotive manifold 3, embed the first positioning plate 301 of the automotive manifold 3 into the positioning groove 102 to achieve the effect of preliminary positioning and avoid the phenomenon of skew of the automotive manifold 3 during detection.

[0050] In this embodiment, it can be referred to Figure 4The blocking module includes several groups of first airway plugs 613 arranged on the detection platform 1, and each first airway plug 613 corresponds to the position of each bronchus 303, wherein a driving unit is provided on the detection platform 1, and the driving unit is used to drive each first airway plug 613 to approach or move away from the bronchus 303; it can be explained that after the positioning of the automobile manifold 3 is completed, each bronchus 303 is coaxial with each first airway plug 613. In this embodiment, the driving unit can drive each first airway plug 613 to be embedded in the bronchus 303 to achieve the effect of blocking the bronchus 303, so as to avoid the leakage of nitric oxide in the automobile manifold 3 from the bronchus 303 during the detection process.

[0051] See also Figure 5 A second air pipe plug 601 is also arranged at the bottom of the test bench 1, and the second air pipe plug 601 is connected to a lifting part that drives it to rise and fall; it can be explained that after the automobile manifold 3 is positioned, the second air pipe plug 601 is driven by the lifting part to be embedded in the main air pipe 306 to achieve the effect of sealing the pipe mouth of the main air pipe 306.

[0052] It should also be noted that the first air pipe plug 613 and the second air pipe plug 601 of the present embodiment are both configured as frustum structures, wherein the conical surfaces of the first air pipe plug 613 and the second air pipe plug 601 are covered with sealing gaskets, and the sealing gaskets are made of a flexible material, such as rubber; specifically, in the present embodiment, by configuring the first air pipe plug 613 and the second air pipe plug 601 as frustum structures, when the first air pipe plug 613 and the second air pipe plug 601 are embedded in the pipe mouth, the sealing performance of the pipe mouth can be improved, and at the same time, since the conical surface of the plug is provided with a sealing gasket, the sealing performance can be further increased.

[0053] See also Figure 2 The lifting module includes a lifting mechanism 201 fixed to one side of the detection platform 1, and the driving end of the lifting mechanism 201 is fixed to the sealing box 2; specifically, the lifting mechanism 201 of this embodiment can adopt a screw nut transmission mechanism or a synchronous belt transmission mechanism, which is not limited in this embodiment, so as to drive the sealing box 2 to rise and fall in the vertical direction.

[0054] In this embodiment, please refer to Figure 4, the lifting part includes a guide rod 616 fixed to the detection table 1. Each first air pipe plug 613 is fixed to the positioning plate 611 through an elastic module. A positioning frame 615 fixed to the positioning plate 611 is slidably sleeved on the guide rod 616. A first spring 617 is arranged on the guide rod 616. One end of the first spring 617 is fixed to the positioning frame 615, and the other end is fixed to the end of the guide rod 616. A first inclined plate 612 is fixedly arranged on the positioning plate 611. The first inclined plate 612 is inclined towards the direction of the first air pipe plug 613. Among them, a first guide wheel 207 for rolling abutting against the first inclined plate 612 is rotatably arranged in the sealing box 2; it can be explained that when sealing the pipe orifice of the bronchus 303, the lifting mechanism 201 drives the sealing box 2 to descend. During the descent of the sealing box 2, the first guide wheel 207 first rolls and abuts against the first inclined plate 612. Under the limiting action of the first guide wheel 207, the positioning plate 611 can be driven to move towards the direction of the automotive manifold 3, and then the first air pipe plug 613 is driven to be inserted into the pipe orifice of the bronchus 303. When the lifting mechanism 201 drives the sealing box 2 to ascend, the first spring 617 can automatically drive all components to reset.

[0055] During the process of blocking the main air pipe 306 and the bronchus 303, in order to avoid the phenomenon of the automotive manifold 3 tilting, in this embodiment, please refer to Figure 5 and Figure 7 , a number of groups of first positioning rods 604 corresponding to the first positioning holes 302 one by one are fixedly arranged in a circumferential array on the periphery of the second air pipe plug 601; among them, the distance between the first positioning rod 604 and the first positioning plate 301 is less than the distance between the second air pipe plug 601 and the first positioning plate 301; among them, it can be referred to Figure 4 , a second positioning rod 614 corresponding to the second positioning hole 304 one by one is fixedly arranged on the periphery of the first air pipe plug 613. The distance between the second positioning rod 614 and the second positioning plate 305 is less than the distance between the first air pipe plug 613 and the second positioning plate 305;

[0056] It can be explained that when the lifting part of this embodiment drives the second air pipe plug 601 to move towards the main air pipe 306, the first positioning rod 604 first inserts into the first positioning hole 302 to achieve positioning. At this time, the second air pipe plug 601 still does not contact the first positioning plate 301. Then, the lifting mechanism 201 drives the sealing box 2 to move towards the detection table 1, and synchronously drives the first air pipe plug 613 to move during the movement. The first air pipe plug 613 drives the second positioning rod 614 to insert into the second positioning hole 304 to achieve the effect of repositioning the automotive manifold 3. At the same time, since the first positioning rod 604 is in the state of inserting into the first positioning hole 302 at this time, the horizontal positioning of the automotive manifold 3 can be achieved. When the first air pipe plug 613 is engaged with the main air pipe 306, it will not push the automotive manifold 3 to shift horizontally; finally, the lifting part can drive the second air pipe plug 601 to continue moving towards the main air pipe 306. Since the second positioning rod 614 is in the state of inserting into the second positioning hole 304, when the second air pipe plug 601 is engaged with the main air pipe 306, it will not cause the automotive manifold 3 to shift vertically either. The stability of the automotive manifold 3 during detection is higher.

[0057] Please refer to Figure 3 and Figure 5 , the first air delivery module includes an air delivery channel 602 opened at the axial center end of the second air pipe plug 601. A first air pipe 6 communicating with the air delivery channel 602 is fixedly arranged at one end of the second air pipe plug 601 away from the detection table 1. The other end of the first air pipe 6 is slidably inserted into the second air pipe 407. A first gas storage tank 4 for storing nitric oxide gas is arranged on one side of the detection table 1. A first air pump 405 is arranged on the first gas storage tank 4. The first air pump 405 is communicated with the second air pipe 407 through a third air pipe 406; it can be explained that when delivering air to the automotive manifold 3, the first air pump 405 is started, and the first air pump 405 can extract the nitric oxide gas in the first gas storage tank 4 and deliver it to the automotive manifold 3 through the third air pipe 406, the second air pipe 407, the first air pipe 6, and the air delivery channel 602. When the detection is completed, the first air pump 405 can re-extract the nitric oxide gas in the automotive manifold 3 into the first gas storage tank 4 for recycling use to reduce the detection cost.

[0058] Please refer to Figure 3 and Figure 5, in this embodiment, the lifting part includes guide plates 605 symmetrically fixed on the first air delivery pipe 6. A limiting rod 606 is slidably inserted into the guide plates 605. A second guide wheel 608 is rotatably arranged at the bottom end of the limiting rod 606. A second spring 607 is arranged on the limiting rod 606. One end of the second spring 607 is fixed to the guide plate 605, and the other end is fixed to the end of the limiting rod 606. A number of groups of support frames 104 are fixedly arranged at the bottom of the detection table 1. A horizontal air cylinder 5 is fixedly arranged on one side of the support frame 104. An adjusting plate is fixedly arranged at the driving end of the horizontal air cylinder 5. Support plates 501 for supporting the second guide wheel 608 are symmetrically fixed on both sides of the adjusting plate. Among them, a second inclined plate 502 is fixedly arranged at the end of the support plate 501 away from the adjusting plate, and the second inclined plate 502 is inclined towards the detection table 1; it can be explained that in the initial state, the second guide wheels 608 on both sides are located on the support plates 501. When it is necessary to adjust the second air pipe plug 601 to rise, the adjusting plate can be driven to contract by the horizontal air cylinder 5. The adjusting plate synchronously drives the support plates 501 and the second inclined plate 502 to move. During the movement of the second inclined plate 502, the second guide wheel 608 can be driven to rise under the limiting action. Since the self-gravity of the first air delivery pipe 6, the second air pipe plug 601 and the first positioning rod 604 is less than the pressure required to drive the second spring 607 to contract, the second guide wheel 608 can drive the first air delivery pipe 6 to rise through the guide plate 605 (reference can be made to Figure 7 ). When the second air pipe plug 601 is inserted into the main air pipe 306, the second guide wheel 608 can be further driven to rise a certain height to compress the second spring 607, thereby improving the sealing performance when the second air pipe plug 601 is engaged with the main air pipe 306.

[0059] In addition, in order to position the second air delivery pipe 407, a connecting plate 408 is fixedly arranged on the second air delivery pipe 407, and the connecting plate 408 is fixed to the support column 409 fixed on the detection table 1.

[0060] Reference can be made to Figure 4 and Figure 8 , the elastic module includes a telescopic rod 603 fixed to the first air pipe plug 613. The other end of the telescopic rod 603 is slidably inserted into a sleeve 610. The sleeve 610 is fixed to a positioning plate 611. Among them, a third spring 609 is arranged in the sleeve 610. One end of the third spring 609 is fixed to the telescopic rod 603, and the other end is fixed to the wall of the sleeve 610; it can be explained that when the first air pipe plug 613 is inserted into the orifice of the bronchus 303, the positioning plate 611 can be further driven to move towards the bronchus 303 to further compress the third spring 609 through the sleeve 610, improving the sealing performance when the first air pipe plug 613 is engaged with the bronchus 303.

[0061] In this embodiment, reference can be made to Figures 1-4, the second gas transmission module includes a gas transmission box 202 fixed on the sealed box 2. An air inlet communicating with the gas transmission box 202 is provided in the sealed box 2. The other end of the gas transmission box 202 is connected to a fourth gas transmission pipe 203. The other end of the fourth gas transmission pipe 203 is connected to a three-way valve 204. One end of the three-way valve 204 communicates with a fifth gas transmission pipe 205. The other end of the fifth gas transmission pipe 205 is connected to a second gas storage tank 402 for storing oxygen through a second air pump 403. The other end of the three-way valve 204 communicates with a sixth gas transmission pipe 206. The other end of the sixth gas transmission pipe 206 communicates with a third gas storage tank 401 through a third air pump 404. Wherein, a fourth air pump (prior art, not shown in the figure) for vacuum pumping is further provided on one side of the sealed box 2;

[0062] It can be explained that after the sealed box 2 covers the detection table 1, the inside of the sealed box 2 is vacuum pumped through the fourth air pump to avoid interference of the gas in the air on the detection. After the first gas transmission module inputs nitric oxide gas into the vehicle manifold 3, in this embodiment, the three-way valve 204 is switched to connect the fourth gas transmission pipe 203 and the fifth gas transmission pipe 205. The second air pump 403 inputs the oxygen in the second gas storage tank 402 into the sealed box 2 through the fifth gas transmission pipe 205 and the fourth gas transmission pipe 203 for subsequent detection. When the vehicle manifold 3 does not leak, in this embodiment, the second air pump 403 can pump the oxygen in the sealed box 2 back to the second gas storage tank 402. When leakage occurs, in this embodiment, the three-way valve 204 is switched to connect the fourth gas transmission pipe 203 and the sixth gas transmission pipe 206, and the nitrogen dioxide gas generated by the reaction in the sealed box 2 is transported to the third gas storage tank 401 through the third air pump 404. This embodiment can effectively recycle the unreacted gas, and at the same time, can separately collect the reacted gas for subsequent treatment.

[0063] In addition, the air pump in this embodiment can adopt models such as KVP04-1.1-24 (Kamoer brand) or Quanfeng Environmental Protection RB-62SH-2, etc. This embodiment does not limit this.

[0064] A detection method for an airtightness detection device of a vehicle manifold includes the following steps:

[0065] Please refer to Figures 1-4 , S1. Place the vehicle manifold 3 to be detected on the detection table 1, and position the vehicle manifold 3 through the positioning module;

[0066] S2. The lifting module drives the sealed box 2 to descend and cover the detection table 1 to isolate the vehicle manifold 3 from the outside air;

[0067] S3. Perform vacuum pumping on the sealed box 2;

[0068] S4. The blocking module performs blocking treatment on each bronchus 303;

[0069] S5. The first gas transmission module inputs a preset amount of nitric oxide gas into the main air pipe 306;

[0070] S6. The second gas transmission module inputs a preset amount of oxygen into the sealed box 2. When any position of the automotive manifold 3 leaks, nitric oxide is discharged from the leak point and contacts the oxygen, and then brownish-red nitrogen dioxide gas is generated, enabling the detection personnel to locate the leak point.

[0071] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, as well as a specific orientation structure and operation. Therefore, it cannot be understood as a limitation to the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0072] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] The above has described in detail an embodiment of the present invention, but the content described is only the preferred embodiment of the present invention and cannot be considered as used to limit the scope of implementation of the present invention. All equal changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. An airtightness detection device for an automotive manifold, comprising a detection table (1), characterized in that, A positioning module is provided on the detection table (1) for positioning the automotive manifold (3). The automotive manifold (3) includes a main air pipe (306), and the main air pipe (306) is respectively communicated with a plurality of groups of branch air pipes (303); a plugging module and a first air delivery module are provided on the detection table (1), the plugging module is used for plugging the pipe orifices of the branch air pipes (303), and the first air delivery module is used for inputting nitric oxide gas into the main air pipe (306). Wherein, a sealing box (2) is further provided on the detection table (1), an opening is formed in the direction of the sealing box (2) facing the detection table (1), a lifting module is provided on the detection table (1), the lifting module is used for driving the sealing box (2) to lift and lower, and a second air delivery module is provided on the sealing box (2), the second air delivery module is used for inputting oxygen into the sealing box (2).

2. The airtightness detection device for an automotive manifold according to claim 1, characterized in that, A first positioning plate (301) is fixedly arranged at the pipe orifice of the main air pipe (306) far away from the branch air pipes (303), a plurality of groups of first positioning holes (302) are formed in the first positioning plate (301), a second positioning plate (305) is fixedly arranged at the pipe orifice of the branch air pipe (303) far away from the main air pipe (306), and a plurality of groups of second positioning holes (304) are formed in the second positioning plate (305).

3. An airtightness detection device for an automotive manifold according to claim 2, characterized in that, The positioning module includes a positioning groove (102) formed on the detection table (1) for embedding the first positioning plate (301), a bearing plate (103) is fixedly arranged in the positioning groove (102), and a through groove (101) is formed in the bearing plate (103).

4. An airtightness detection device for an automotive manifold according to claim 2, characterized in that, The plugging module includes a plurality of groups of first air pipe plugs (613) arranged on the detection table (1), and the positions of the first air pipe plugs (613) respectively correspond to the positions of the branch air pipes (303). Wherein, a driving part is provided on the detection table (1), and the driving part is used for driving each first air pipe plug (613) to approach or move away from the branch air pipe (303).

5. An airtightness detection device for an automotive manifold according to claim 4, characterized in that, A second air pipe plug (601) is further arranged at the bottom of the detection table (1), and the second air pipe plug (601) is connected with a lifting part for driving its lifting and lowering.

6. The airtightness detection device for an automotive manifold according to claim 5, characterized in that, The lifting part includes a guide rod (616) fixed on the detection table (1), each first air pipe plug (613) is respectively fixed with a positioning plate (611) through an elastic module, a positioning frame (615) fixed with the positioning plate (611) is slidably sleeved on the guide rod (616), a first spring (617) is arranged on the guide rod (616), a first inclined plate (612) is fixedly arranged on the positioning plate (611), and the first inclined plate (612) inclines towards the direction of the first air pipe plug (613). Wherein, a first guide wheel (207) for rolling and abutting against the first inclined plate (612) is rotatably arranged in the sealing box (2).

7. An airtightness detection device for an automotive manifold according to claim 5, characterized in that, A plurality of groups of first positioning rods (604) corresponding to the first positioning holes (302) one by one are fixedly arranged in a circumferential array on the periphery of the second air pipe plug (601), and the distance between the first positioning rod (604) and the first positioning plate (301) is smaller than the distance between the second air pipe plug (601) and the first positioning plate (301). Among them, a second positioning rod (614) corresponding to the second positioning hole (304) one by one is fixedly arranged around the periphery of the first air pipe plug (613), and the distance between the second positioning rod (614) and the second positioning plate (305) is smaller than the distance between the first air pipe plug (613) and the second positioning plate (305).

8. An airtightness detection device for an automotive manifold according to claim 5, characterized in that, The first air delivery module includes an air delivery channel (602) opened at the axial center end of the second air pipe plug (601). A first air delivery pipe (6) communicated with the air delivery channel (602) is fixedly arranged at one end of the second air pipe plug (601) far away from the detection table (1). The other end of the first air delivery pipe (6) is slidably inserted into the second air delivery pipe (407). A first gas storage tank (4) for storing nitric oxide gas is arranged on one side of the detection table (1). A first air pump (405) is arranged on the first gas storage tank (4). The first air pump (405) is communicated with the second air delivery pipe (407) through a third air delivery pipe (406).

9. An airtightness detection device for an automotive manifold according to claim 8, characterized in that, The lifting part includes guide plates (605) symmetrically fixed on the first air delivery pipe (6). A limiting rod (606) is slidably inserted into the guide plates (605). A second guide wheel (608) is rotatably arranged at the bottom end of the limiting rod (606). A second spring (607) is arranged on the limiting rod (606). A plurality of groups of support frames (104) are fixedly arranged at the bottom of the detection table (1). A horizontal air cylinder (5) is fixedly arranged on one side of the support frame (104). An adjusting plate is fixedly arranged at the driving end of the horizontal air cylinder (5). Support plates (501) for supporting the second guide wheel (608) are symmetrically fixedly arranged on both sides of the adjusting plate. Among them, a second inclined plate (502) is fixedly arranged at one end of the support plate (501) far away from the adjusting plate, and the second inclined plate (502) inclines towards the direction close to the detection table (1).

10. The airtightness detection device for an automotive manifold according to claim 1, characterized in that, The second air delivery module includes an air delivery box (202) fixed on the sealed box (2). An air delivery port communicated with the air delivery box (202) is opened in the sealed box (2). The other end of the air delivery box (202) is connected with a fourth air delivery pipe (203). The other end of the fourth air delivery pipe (203) is connected with a three-way valve (204). One end of the three-way valve (204) is communicated with a fifth air delivery pipe (205). The other end of the fifth air delivery pipe (205) is connected with a second gas storage tank (402) for storing oxygen through a second air pump (403). The other end of the three-way valve (204) is communicated with a sixth air delivery pipe (206). The other end of the sixth air delivery pipe (206) is communicated with a third gas storage tank (401) through a third air pump (404). Among them, a fourth air pump for vacuum pumping is further arranged on one side of the sealed box (2).

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