Leakage detection device for fuel evaporation pipe

Abstract

The invention relates to the technical field of pipe airtightness detection, in particular to a fuel evaporation pipe leakage detection device which comprises a detection case and a detection mechanism arranged in the detection case, an adjusting mechanism is further arranged in the detection case, and the adjusting mechanism comprises a set of adjusting boxes movably installed on the side wall of the detection case. A movable opening is formed in the surface of the front side of the adjusting box, a carrying disc is arranged on the outer side of the movable opening, and a main connector and a detection opening used for air tightness detection are arranged in the center of the surface of the front side of the carrying disc. According to the device, the main connector is arranged, the standby connector in the different position exchange mechanism is selected to be connected to the main connector, multiple purposes are achieved, convenience is improved, the main connector is finely adjusted by arranging the rotating mechanism, then the direction of a detection opening of the main connector is changed, the bending and twisting degree when the evaporation pipe is connected in is reduced to a certain degree, and the finished product quality of the evaporation pipe is prevented from being affected.

Description

Technical Field

[0001] The invention relates to the technical field of air tightness detection of pipes, in particular to a leakage detection device for a fuel evaporation pipe. Background Art

[0002] Automobile fuel tanks are usually filled with gasoline vapor. A fuel evaporation control system is set up. On the one hand, in order to balance the air pressure in the fuel tank, gasoline vapor is introduced into the engine for combustion through the evaporator pipe; on the other hand, in order to prevent gasoline vapor from being discharged into the atmosphere and causing pollution, gasoline vapor is introduced into the activated carbon canister through the evaporator pipe to adsorb gasoline molecules in the vapor. It can be seen that the evaporator pipe is used as an indispensable connecting pipe in the fuel evaporation control system.

[0003] In order to ensure the normal operation of the fuel system and determine whether there is leakage in the evaporator tube, the manufacturer will conduct air tightness test on the finished evaporator tube. The gas detection method is a commonly used air tightness detection method for pipeline systems. During the detection, one end of the tube is sealed, nitrogen is injected along the other end of the tube, and a leak detection instrument is used to evaluate the air tightness performance of the tube. This method can detect tiny gas leaks and has the advantages of high detection accuracy and high degree of automation.

[0004] According to a patent application with application number CN202110727599.9, an automobile pipeline air tightness test device is disclosed. The specification mentions that many companies currently perform manual operations such as manually tightening and clamping the joints at both ends of automobile pipelines during air tightness testing. The operation is cumbersome, the testing efficiency is low, and the labor intensity of employees is high, resulting in less finished products being produced every day. In the current automobile pipeline air tightness test device, the automobile pipeline often fails to be fixed in place and the air tightness test fails during air tightness testing. The sealing of the automobile pipeline cannot be guaranteed. After being installed on the automobile, there are certain safety hazards. In addition to the problems raised in the above patents, the air tightness detection device in the prior art also has the following defects: in order to facilitate access to the fuel evaporation control system in a specific space, the evaporator tube is generally composed of a rubber tube body and a metal tube head. The metal tube head is generally bent, and the overall shape is generally divided into straight tubes, curved tubes, single-sided elbows or double-sided elbows. The existing detection devices generally adopt a solution for these evaporator tubes of different specifications to set multiple groups of detection connectors of different specifications on the same detection device, or to set multiple independent detection devices. Therefore, when detecting evaporator tubes of different specifications, it is necessary to frequently replace the detection port group adapted thereto, which will increase the maintenance components and maintenance frequency of the device. Moreover, these detection connectors are usually fixed on the detection device. When performing detection, the evaporator tube needs to be continuously moved to cooperate with the access connector. This continuous adjustment of the evaporator tube finished product, such as bending and twisting, is likely to affect the quality of the finished product. Summary of the invention

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a fuel evaporation pipe leakage detection device, comprising a detection box and a detection mechanism arranged in the detection box, the detection mechanism adopts a gas detection method to detect the airtightness, the detection box is also provided with an adjustment mechanism, the adjustment mechanism comprises a group of adjustment boxes movably mounted on the side wall of the detection box, a movable opening is opened on the front side surface of the adjustment box, and a carrier is arranged outside the movable opening, and a main joint is arranged at the center of the front side surface of the carrier, which is used as a detection port for airtightness detection; A fixed plate is fixedly arranged inside the adjustment box, a first groove is opened at the center of the fixed plate, the inner edge of the first groove is a rack-shaped structure, a plurality of push-pull rods for connecting the carrier plate are movably arranged on the fixed plate, and a rotating mechanism is arranged in the first groove for adjusting the positional relationship between the carrier plate and the adjustment box; The front surface of the adjustment box is provided with a plurality of switching mechanisms distributed on the outside of the edge of the carrier plate, the switching mechanism includes a base plate installed on the adjustment box, a cylinder 1 is installed on the base plate, a cantilever is movably connected to one end of the starting rod of the cylinder 1, and a fixing frame is also fixedly installed on the cylinder 1, which serves as a fixed fulcrum of the cantilever, a spare joint is installed at one end of the cantilever, and the spare joint is connected to the main joint for changing the model of the detection port.

[0006] Preferably, a placing table is provided on the workbench of the detection chassis, and two clamping seats are movably provided on the placing table, an evaporation tube is clamped on the two clamping seats, and both ends of the evaporation tube are respectively connected to the main joints of the two adjustment mechanisms.

[0007] Preferably, the detection mechanism mainly includes a nitrogen tank installed on the detection chassis, a delivery pump for delivering nitrogen, and a nitrogen leak detector arranged in the workbench area of ​​the detection chassis. The output end of the nitrogen tank is connected to the input end of the delivery pump, and one end of the output end of the delivery pump is connected to a first conduit.

[0008] Preferably, one end of the first conduit is connected to a second conduit, the second conduit movably penetrates into the cavity of the adjustment box and is connected to the carrier plate, and the second conduit, the carrier plate and the interior of the main joint are communicated.

[0009] Preferably, the diameter of the carrier plate is smaller than the diameter of the movable opening, the edge of the movable opening is provided with a plurality of notches for moving the push-pull rod, and the front surface of the adjustment box is also provided with a plurality of through holes for installing the exchange mechanism by bolts.

[0010] Preferably, the outer surface of the fixed plate is provided with a plurality of second grooves, each of which is slidably connected to a slider, one end of the push-pull rod is movably connected to the slider, and the other end of the push-pull rod is movably connected to the carrier plate, and a spring is fixedly connected between one side of the slider and one side inner wall of the second groove.

[0011] Preferably, the rotating mechanism includes a driving shaft, a connecting plate fixedly connected to the driving shaft, a gear rotatably connected to the other end of the connecting plate, and a cylinder 2 rotatably installed on the top of the gear.

[0012] Preferably, the driving shaft is rotatably connected to the center of the first groove via a rotating shaft, and the gear is meshed with a rack on the inner wall of the first groove.

[0013] Preferably, a circular slide groove is provided on the end surface of the carrier plate opposite to the main joint, and one end of the pneumatic rod of the second cylinder is slidably connected to the inside of the circular slide groove.

[0014] Preferably, a motor is arranged in a region inside the detection case close to the adjustment box, and an output shaft of the motor movably penetrates the detection case, the adjustment box, and the fixed plate and is fixedly connected to the rotating shaft of the driving shaft. Beneficial Effects

[0015] Compared with the prior art, the present invention provides a fuel evaporation pipe leakage detection device, which has the following beneficial effects: By setting an adjustment mechanism in the workbench area of ​​the detection chassis, the main joint in the adjustment mechanism is used as a fixed detection port for air tightness detection, and a number of replacement mechanisms are set on the periphery of the main joint. The model of the evaporation tube actually detected is selected, and then the spare joints in the replacement mechanisms at different positions are connected to the main joint, so as to achieve the effect of changing a variety of different spare joints on the same detection port. This method realizes multiple uses of one machine, improves convenience, and facilitates the maintenance of the detection mechanism and the entire detection device; When the evaporator tube is placed on the workbench for inspection, the main joint is first fine-tuned through the rotating mechanism according to the port direction of the evaporator tube, and then the direction of the inspection port of the main joint is changed, which brings convenience for the main joint to adapt to the port connected to the evaporator tube. This method of making the main joint actively cooperate with the evaporator tube for connection reduces the degree of bending and twisting of the evaporator tube when it is connected to a certain extent, avoiding affecting the quality of the finished product of the evaporator tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 This is the overall structural diagram of the detection chassis and the adjustment mechanism of the present invention; Figure 2 This is a schematic diagram of the structure of the adjustment mechanism of the present invention; Figure 3 It is a front view of the detection chassis and the adjustment mechanism of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of part A; Figure 5 This is a disassembled diagram of the adjustment box of the adjustment mechanism of the present invention and its internal structure; Figure 6 This is a schematic diagram of the structure of the rotating mechanism disposed in the carrier plate of the present invention; Figure 7 This is a schematic diagram of the structure of the exchange mechanism arranged outside the adjustment box of the present invention.

[0017] Description of reference numerals: Detection chassis; 11. Placement table; 12. Card holder; 13. Evaporation tube; 14. First conduit; Adjustment box; 21, movable opening; 22, fixed plate; 221, first groove; 222, second groove; 223, push-pull rod; 224, spring; Carrying plate; 31. Main joint; 32. Second conduit; Replacement mechanism; 41, bottom plate; 42, cylinder 1; 43, cantilever; 44, fixing frame; 45, spare joint; 5. Driving shaft; 51. Connecting plate; 52. Gear; 53. Cylinder 2. DETAILED DESCRIPTION

[0018] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0019] Embodiment 1, as Figure 1-7 As shown, in order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a leakage detection device for a fuel evaporation pipe, comprising a detection box 1 and a detection mechanism arranged in the detection box 1, the detection mechanism adopts a gas detection method to detect the airtightness, and an adjustment mechanism is also arranged in the detection box 1, the adjustment mechanism comprises a group of adjustment boxes 2 movably mounted on the side wall of the detection box 1, a movable opening 21 is opened on the front side surface of the adjustment box 2, and a carrier plate 3 is arranged outside the movable opening 21, and a main joint 31 is arranged at the center of the front side surface of the carrier plate 3, which is used as a detection port for airtightness detection; Among them, the detection mechanism mainly includes a nitrogen tank installed on the detection chassis 1, a delivery pump for delivering nitrogen, and a nitrogen leak detector arranged in the workbench area of ​​the detection chassis 1. The output end of the nitrogen tank is connected to the input end of the delivery pump. One end of the output end of the delivery pump is connected to a first conduit 14, and one end of the first conduit 14 is connected to a second conduit 32. The second conduit 32 movably penetrates into the cavity of the adjustment box 2 and is connected to the carrier 3. The second conduit 32, the carrier 3 and the main joint 31 are connected to each other. During the detection, the delivery pump is started to deliver the nitrogen in the nitrogen tank along the first conduit 14 and the second conduit 32 to the detection port of the main joint 31; Furthermore, a placing table 11 is provided on the workbench of the detection chassis 1, and two clamping seats 12 are movably provided on the placing table 11. An evaporation tube 13 is clamped on the two clamping seats 12, and both ends of the evaporation tube 13 are respectively connected to the main joints 31 of the two adjustment mechanisms. During the detection, nitrogen is injected into the evaporation tube 13 along the main joints 31, and then the evaporation tube 13 is detected by a nitrogen leak detector to detect whether there is a leakage. If there is a leakage, the evaporation tube 13 is considered to be an unqualified finished product. If there is no leakage, the evaporation tube 13 is considered to be a qualified finished product.

[0020] Embodiment 2, as Figure 2-6 As shown, a fixed plate 22 is fixedly provided inside the adjustment box 2, a first groove 221 is provided at the center of the fixed plate 22, the inner edge of the first groove 221 is a rack-shaped structure, a plurality of push-pull rods 223 for connecting the carrier plate 3 are movably provided on the fixed plate 22, the diameter of the carrier plate 3 is smaller than the diameter of the movable opening 21, so that when the carrier plate 3 rotates with its center as the midpoint, it will not touch the edge of the movable opening 21, a plurality of notches for the push-pull rod 223 to move are provided on the edge of the movable opening 21, so that the push-pull rod 223 has sufficient moving space when moving, a plurality of through holes are also provided on the front side surface of the adjustment box 2 for installing the exchange mechanism 4 by bolts, the number of the exchange mechanism 4 to be installed can be increased or decreased according to actual needs, and the installation position of the exchange mechanism 4 can be changed according to actual convenience; Furthermore, a plurality of second grooves 222 are provided on the outer surface of the fixed plate 22, and a slider is slidably connected in each second groove 222, one end of the push-pull rod 223 is movably connected to the slider, and the other end of the push-pull rod 223 is movably connected to the carrier 3, and a spring 224 is fixedly connected between one side of the slider and one side inner wall of the second groove 222. When one end of the push-pull rod 223 moves in the second groove 222, the other end of the push-pull rod 223 drives the carrier 3 to deflect, thereby changing the direction of the detection port of the main joint 31, which brings convenience for the main joint 31 to adapt to the port connected to the evaporator tube 13. This method of making the main joint 31 actively cooperate with the evaporator tube 13 for connection reduces the degree of bending and twisting of the evaporator tube 13 when it is connected to a certain extent, thereby avoiding affecting the finished product quality of the evaporator tube 13.

[0021] Embodiment three, as Figure 5 and Figure 6 As shown, a rotating mechanism is arranged in the first groove 221 for adjusting the positional relationship between the carrier 3 and the adjustment box 2. The rotating mechanism comprises a driving shaft 5, a connecting plate 51 fixedly connected to the driving shaft 5, a gear 52 rotatably connected to the other end of the connecting plate 51, and a cylinder 2 53 rotatably mounted on the top of the gear 52. The driving shaft 5 is rotatably connected to the center position of the first groove 221 through a rotating shaft, and the gear 52 is meshed with the inner wall rack of the first groove 221. When the driving shaft 5 rotates, the gear 52 is driven to move synchronously through the connecting plate 51, and the gear 52 revolves around the center of the driving shaft 5 and rotates itself at the same time. The cylinder 2 53 is rotatably connected to the gear 52, so the gear 52 drives the cylinder 2 53 to move synchronously during its revolution. The position change of the cylinder 2 53 facilitates the drive control to change different edge positions on the carrier 3, and the rotation of the gear 52 will not drive the cylinder 2 53 to rotate synchronously. The meshing of the cylinder 2 53 with the inner wall rack of the first groove 221 can increase the stability of the entire rotating mechanism. Among them, a circular slide groove is opened on the end face of the side opposite to the main joint 31 of the carrier 3, and one end of the pneumatic rod of the cylinder 2 53 is slidably connected to the inside of the circular slide groove. A motor is arranged in the area inside the detection box 1 close to the adjustment box 2. The output shaft of the motor respectively moves through the detection box 1, the adjustment box 2, and the fixed plate 22 and is fixedly connected to the rotating shaft of the driving shaft 5. The driving shaft 5 is driven by the motor to rotate, thereby driving the above-mentioned gear 52 and the cylinder 2 53 to move or rotate. The cylinder 2 53 drives its pneumatic rod to telescope and move. When the pneumatic rod telescopes, it drives the carrier 3 to deflect, thereby changing the direction of the detection port of the main joint 31.

[0022] Embodiment 4, as Figure 2 and Figure 7As shown, the front surface of the adjustment box 2 is provided with a plurality of exchange mechanisms 4 distributed outside the edge of the carrier plate 3, and the exchange mechanism 4 includes a bottom plate 41 installed on the adjustment box 2, and a cylinder 42 is installed on the bottom plate 41, and one end of the start rod of the cylinder 42 is movably connected with a cantilever 43, and a fixing frame 44 is also fixedly installed on the cylinder 42, which is used as a fixed fulcrum of the cantilever 43, and a spare joint 45 is installed at one end of the cantilever 43. In the initial state, that is, when the evaporation tube 13 is not detected, the pneumatic rod of the cylinder 42 is retracted inside it, and at this time, one end of the cantilever 43 drives the spare joint 45 to be farthest from the main joint 31, and will not block the access to the evaporation tube 13; Among them, the spare joint 45 is connected to the main joint 31 for changing the model of the detection port. Since the cantilever 43 and one end of the pneumatic rod of the cylinder 42 are movably connected, after the spare joint 45 is connected to the main joint 31, the spare joint 45 will not have an inhibitory effect on it when the main joint 31 is fine-tuned. According to the model of the evaporation tube 13 actually detected, the spare joint 45 in the different position exchange mechanism 4 is selected to be connected to the main joint 31, so as to achieve the effect of changing a variety of different spare joints 45 on the same detection port. This method is convenient for the maintenance of the detection mechanism and the entire detection device, and is more convenient.

[0023] When the above embodiment is working, when the evaporation tube 13 is connected, the evaporation tube 13 is first clamped in the clamping seat 12, and the two ends of the evaporation tube 13 are respectively connected to the main joints 31 of the two adjustment mechanisms. Before the port of the evaporation tube 13 is connected to the main joint 31, the driving shaft 5 is first driven to rotate by starting the motor, thereby driving the gear 52 and the second cylinder 53 to move or rotate. At the same time, the second cylinder 53 is started to drive its pneumatic rod to telescopically move. When the pneumatic rod is telescopic, the carrier plate 3 is driven to deflect, thereby changing the direction of the detection port of the main joint 31, which brings convenience for the main joint 31 to adapt to the port of the evaporation tube 13. This method of making the main joint 31 actively cooperate with the evaporation tube 13 for connection reduces the degree of bending and twisting of the evaporation tube 13 when it is connected to a certain extent, and avoids affecting the finished product quality of the evaporation tube 13. During the inspection, the nitrogen in the nitrogen tank is transported to the inspection port of the main joint 31 along the first conduit 14 and the second conduit 32 by starting the delivery pump, and the nitrogen is injected into the evaporation tube 13 along the main joint 31, and then the evaporation tube 13 is inspected for leakage by a nitrogen leak detector. If there is leakage, the evaporation tube 13 is considered to be an unqualified finished product, and if there is no leakage, the evaporation tube 13 is considered to be a qualified finished product; When the model of the evaporation tube 13 to be tested is replaced, the cylinder 1 42 is started to make its pneumatic rod drive the cantilever 43 to deflect, so that the cantilever 43 drives the spare joint 45 from the initial state of being away from the main joint 31 to being connected to the main joint 31. According to the model of the evaporation tube 13 actually tested, the spare joint 45 in the different position exchange mechanism 4 is selected to be connected to the main joint 31, so as to achieve the effect of changing a variety of different spare joints 45 on the same detection port. This method realizes multiple uses of one machine, improves convenience, and facilitates the maintenance of the detection mechanism and the entire detection device.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fuel evaporation pipe leakage detection device, comprising a detection box (1) and a detection mechanism arranged in the detection box (1), wherein the detection mechanism uses a gas detection method to detect airtightness, and is characterized in that: The detection box (1) is also provided with an adjustment mechanism, the adjustment mechanism comprising a set of adjustment boxes (2) movably mounted on the side wall of the detection box (1), a movable opening (21) being provided on the front surface of the adjustment box (2), and a carrier (3) being provided outside the movable opening (21), and a main joint (31) being provided at the center of the front surface of the carrier (3) and serving as a detection opening for air tightness detection; A fixed plate (22) is fixedly arranged inside the adjustment box (2), a first groove (221) is provided at the center of the fixed plate (22), the inner edge of the first groove (221) is a rack-shaped structure, a plurality of push-pull rods (223) for connecting to the carrier plate (3) are movably arranged on the fixed plate (22), and a rotating mechanism is arranged in the first groove (221) for adjusting the positional relationship between the carrier plate (3) and the adjustment box (2); The front surface of the adjustment box (2) is provided with a plurality of exchange mechanisms (4) distributed outside the edge of the carrier plate (3), the exchange mechanism (4) comprising a bottom plate (41) mounted on the adjustment box (2), a cylinder (42) mounted on the bottom plate (41), a cantilever (43) movably connected to one end of a starter rod of the cylinder (42), and a fixing frame (44) fixedly mounted on the cylinder (42) and serving as a fixed fulcrum of the cantilever (43), a spare joint (45) mounted on one end of the cantilever (43), the spare joint (45) being connected to the main joint (31) for changing the model of the detection port.

2. A fuel evaporation pipe leakage detection device according to claim 1, characterized in that: A placement table (11) is arranged on the workbench of the detection chassis (1), two clamping seats (12) are movably arranged on the placement table (11), an evaporation tube (13) is clamped on the two clamping seats (12), and two ends of the evaporation tube (13) are respectively connected to the main joints (31) of the two adjustment mechanisms.

3. The fuel evaporation pipe leakage detection device according to claim 1, characterized in that: The detection mechanism mainly comprises a nitrogen tank installed on the detection chassis (1), a delivery pump for delivering nitrogen, and a nitrogen leak detector arranged in the workbench area of ​​the detection chassis (1); the output end of the nitrogen tank is connected to the input end of the delivery pump, and one end of the output end of the delivery pump is connected to a first conduit (14).

4. A fuel evaporation pipe leakage detection device according to claim 3, characterized in that: One end of the first conduit (14) is connected to a second conduit (32), the second conduit (32) movably penetrates into the cavity of the adjustment box (2) and is connected to the carrier plate (3), and the second conduit (32), the carrier plate (3) and the main joint (31) are internally connected.

5. The fuel evaporation pipe leakage detection device according to claim 1, characterized in that: The diameter of the carrier plate (3) is smaller than the diameter of the movable opening (21); the edge of the movable opening (21) is provided with a plurality of notches for moving the push-pull rod (223); and the front surface of the adjustment box (2) is also provided with a plurality of through holes for mounting the exchange mechanism (4) via bolts.

6. The fuel evaporation pipe leakage detection device according to claim 1, characterized in that: The outer surface of the fixed plate (22) is provided with a plurality of second grooves (222), each of the second grooves (222) is slidably connected to a slider, one end of a push-pull rod (223) is movably connected to the slider, and the other end of the push-pull rod (223) is movably connected to the carrier plate (3), and a spring (224) is fixedly connected between a side surface of the slider and an inner wall of one side of the second groove (222).

7. The fuel evaporation pipe leakage detection device according to claim 1, characterized in that: The rotating mechanism comprises a driving shaft (5), a connecting plate (51) fixedly connected to the driving shaft (5), a gear (52) rotatably connected to the other end of the connecting plate (51), and a second cylinder (53) rotatably mounted on the top end of the gear (52).

8. The fuel evaporation pipe leakage detection device according to claim 7, characterized in that: The driving shaft (5) is rotatably connected to the center of the first groove (221) via a rotating shaft, and the gear (52) is meshed with a rack on the inner wall of the first groove (221).

9. The fuel evaporation pipe leakage detection device according to claim 7, characterized in that: A circular slide groove is provided on the end surface of the carrier plate (3) opposite to the main joint (31), and one end of the pneumatic rod of the second cylinder (53) is slidably connected to the inside of the circular slide groove.

10. The fuel evaporation pipe leakage detection device according to claim 8, characterized in that: A motor is arranged in an area inside the detection box (1) close to the adjustment box (2), and the output shaft of the motor movably passes through the detection box (1), the adjustment box (2), and the fixed plate (22) and is fixedly connected to the rotating shaft of the driving shaft (5).

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