Vehicle-mounted tail gas sampling docking device

Abstract

The invention relates to a vehicle-mounted tail gas sampling docking device. The vehicle-mounted tail gas sampling butt-joint device comprises a base, a turning pipe, a bracket, a butt-joint pipe, a movable joint and an adjusting piece, one end of the turning pipe is communicated with the base; one end of the support is connected with the base, and the other end of the support is connected with the end, away from the base, of the turning pipe. One end of the butt joint pipe is communicated with the base; the movable connector is communicated with the end, away from the base, of the butt joint pipe and used for being arranged outside an automobile exhaust pipe in a sleeving mode, the end, away from the butt joint pipe, of the movable connector is provided with a plurality of slits, the extending direction of the slits is the same as the axial direction of the movable connector, and the slits are distributed around the center axis of the movable connector at intervals. And the adjusting piece is sleeved outside the movable joint, covers the fine seam and is used for adjusting the diameter of the movable joint. According to the scheme provided by the invention, the vehicle-mounted tail gas sampling docking device and the automobile tail gas pipe can be quickly, conveniently and reliably mounted in a sealing manner.

Description

Technical Field

[0001] This application relates to the field of automotive testing technology, and in particular to an on-board exhaust gas sampling docking device. Background Technology

[0002] During vehicle emissions testing, the PEMS (Portable Emissions Testing System) needs to be closely connected to the vehicle's exhaust pipe via an exhaust gas sampling tailpipe in order to accurately collect and analyze exhaust emission data.

[0003] In related technologies, the existing installation methods of exhaust gas sampling tailpipes have many problems. The exhaust gas sampling tailpipes of PEMS equipment are generally fixed to the vehicle's exhaust pipe with clamps. However, the clamp installation process requires tools and takes an average of 5-8 minutes, affecting the testing efficiency. Moreover, the vibration of the vehicle's exhaust pipe can easily cause the exhaust gas sampling tailpipe to loosen and leak. Furthermore, the sealing material is prone to aging and failure in high-temperature environments (>300℃), resulting in poor sealing performance of the exhaust gas sampling tailpipe and poor adaptability to different vehicle models and exhaust pipes. These problems not only affect the testing efficiency but may also lead to inaccurate test data. Summary of the Invention

[0004] To address or partially address the problems existing in related technologies, this application provides a vehicle-mounted exhaust gas sampling docking device that enables rapid, convenient, and reliable sealed installation of the vehicle-mounted exhaust gas sampling docking device and the vehicle's exhaust pipe.

[0005] This application provides a vehicle exhaust gas sampling docking device, comprising a base, a deflector tube, a bracket, a connecting tube, a movable joint, and an adjusting component. One end of the deflector tube is connected to the base. One end of the bracket is connected to the base, and the other end of the bracket is connected to the end of the deflector tube away from the base, with the bracket supporting the deflector tube. One end of the connecting tube is connected to the base. The movable joint is connected to the end of the connecting tube away from the base and is used to fit over the vehicle exhaust pipe. Multiple slits are formed at the end of the movable joint away from the connecting tube, with the slits extending in the same direction as the axial direction of the movable joint, and the slits are spaced apart around the central axis of the movable joint. The adjusting component fits over the movable joint, covers the slits, and is used to adjust the diameter of the movable joint.

[0006] Furthermore, the movable joint is provided with at least one positioning arm at the end away from the connecting pipe, the positioning arm being detachably connected to the vehicle exhaust pipe to position the movable joint on the vehicle exhaust pipe.

[0007] Furthermore, the positioning arm is equipped with a magnet, which is used to attach to the outer surface of the vehicle's exhaust pipe.

[0008] Furthermore, there are multiple positioning arms, which are spaced apart around the central axis of the movable joint.

[0009] Furthermore, the adjusting element is made of an elastic material.

[0010] Furthermore, the end of the movable joint away from the connecting pipe is frustum-shaped, and the outer surface of the end of the movable joint away from the connecting pipe is provided with external threads. The adjusting member is annular, the inner surface of the adjusting member is funnel-shaped, and the inner surface of the adjusting member is provided with internal threads. The adjusting member is screwed onto the end of the movable joint away from the connecting pipe.

[0011] Furthermore, the bracket includes a first connecting arm, a second connecting arm, a third connecting arm, a fourth connecting arm, a first fixing member, a second fixing member, and a third fixing member; One end of the first connecting arm is connected to the base, the end of the first connecting arm away from the base is hinged to the second connecting arm, the end of the second connecting arm away from the first connecting arm is hinged to the third connecting arm, the end of the third connecting arm away from the second connecting arm is hinged to the fourth connecting arm, and the end of the fourth connecting arm away from the third connecting arm is connected to the deflector. A first fixing member is installed at the hinge joint between the first connecting arm and the second connecting arm, and the first fixing member is used to fix the relative angle between the first connecting arm and the second connecting arm. A second fixing member is installed at the hinge joint between the second connecting arm and the third connecting arm, and the second fixing member is used to fix the relative angle between the second connecting arm and the third connecting arm. A third fixing member is installed at the hinge joint between the third connecting arm and the fourth connecting arm, and the third fixing member is used to fix the relative angle between the third connecting arm and the fourth connecting arm.

[0012] Furthermore, a first pivot is provided at the hinge joint between the first connecting arm and the second connecting arm, and the first connecting arm rotates around the first pivot. A second pivot is provided at the hinge joint between the second connecting arm and the third connecting arm, and the second connecting arm rotates around the second pivot. A third pivot is provided at the hinge joint between the third connecting arm and the fourth connecting arm, and the third connecting arm rotates around the third pivot. The axial direction of the first pivot is perpendicular to the axial direction of the second pivot, and the axial direction of the second pivot is perpendicular to the axial direction of the third pivot.

[0013] Furthermore, the deflector includes a first straight pipe, a corrugated pipe, and a second straight pipe. The first straight pipe is connected to the bracket and the base, respectively. The corrugated pipe is connected to the first straight pipe and the second straight pipe, respectively. The second straight pipe is connected to the bracket.

[0014] Furthermore, the surface of the movable joint is provided with a groove, and the inner surface of the adjusting member is provided with a rib, which is embedded in the groove.

[0015] The technical solution provided in this application may include the following beneficial results: by opening multiple slits at the end of the movable joint away from the connecting pipe, and fitting the adjusting component over the movable joint, when the connecting pipe needs to be installed on the vehicle exhaust pipe, the diameter of the movable joint is reduced by the adjusting component, so that the movable joint is tightly pressed against the outside of the vehicle exhaust pipe, thereby ensuring that the movable joint is tightly connected to the vehicle exhaust pipe. Furthermore, since the adjusting component can cover all the slits, it ensures that the exhaust gas discharged from the vehicle exhaust pipe will not leak from the slits, ensuring the accuracy of the exhaust gas test data. This achieves a fast, convenient, and reliably sealed installation of the vehicle exhaust gas sampling docking device and the vehicle exhaust pipe.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The above and other objects, features and advantages of this application will become more apparent from the following description of exemplary embodiments of this application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components.

[0018] Figure 1 This is a schematic diagram of the structure of the vehicle exhaust gas sampling docking device shown in the embodiments of this application; Figure 2 This is another structural schematic diagram of the vehicle exhaust gas sampling docking device shown in the embodiments of this application.

[0019] Reference numerals: Base 1; Deflector 2; First straight pipe 21; Corrugated pipe 22; Second straight pipe 23; Bracket 3; First connecting arm 31; Second connecting arm 32; Third connecting arm 33; Fourth connecting arm 34; Connecting pipe 4; Movable joint 5; Pressing claw 51; Slit 52; Adjusting component 6; Exhaust pipe 7. Detailed Implementation

[0020] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0021] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0023] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In related technologies, existing installation methods for exhaust gas sampling tailpipes have many problems. PEMS equipment typically uses clamps to fix the exhaust gas sampling tailpipe to the vehicle's exhaust pipe, but the clamp installation process requires tools and takes an average of 5-8 minutes, affecting testing efficiency. Furthermore, vibrations in the vehicle's exhaust pipe can easily cause the exhaust gas sampling tailpipe to loosen and leak, and the sealing material is prone to aging and failure in high-temperature environments (>300℃), resulting in poor sealing and poor adaptability to different vehicle models and exhaust pipes. These problems not only affect testing efficiency but may also lead to inaccurate test data. To address these issues, this application provides an on-board exhaust gas sampling docking device that enables rapid, convenient, and reliable sealing installation between the on-board exhaust gas sampling docking device and the vehicle's exhaust pipe.

[0025] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0026] See Figure 1The vehicle-mounted exhaust gas sampling docking device includes a base 1, a deflector pipe 2, a bracket 3, a docking pipe 4, a movable connector 5, and an adjusting component 6. The base 1 has an inner cavity. One end of the deflector pipe 2 is connected to the base 1, and the deflector pipe 2 communicates with the inner cavity, allowing gas to flow from the base 1 to the deflector pipe 2. The end of the deflector pipe 2 furthest from the base 1 can change its orientation.

[0027] See Figure 1 One end of the bracket 3 is connected to the base 1, and the other end of the bracket 3 is connected to the end of the deflector tube 2 away from the base 1. The bracket 3 supports the deflector tube 2. The bracket 3 is positioned above the deflector tube 2, and the end of the bracket 3 away from the base 1 can suspend the deflector tube 2, thus preventing the end of the deflector tube 2 away from the base 1 from drooping. The position of the end of the bracket 3 away from the base 1 can be adjusted according to the orientation of the deflector tube 2 to ensure that the bracket 3 can always support the deflector tube 2. One end of the connecting pipe 4 is connected to the base 1, and the connecting pipe 4 is connected to the inner cavity, allowing gas in the connecting pipe 4 to flow into the inner cavity.

[0028] See Figure 1 The movable connector 5 is connected to the end of the connecting pipe 4 furthest from the base 1, allowing gas in the movable connector 5 to flow into the connecting pipe 4. The movable connector 5 and the connecting pipe 4 are detachably connected, with the movable connector 5 and the connecting pipe 4 threaded together. A sealing ring is fitted at the connection point of the movable connector 5 and the connecting pipe 4 to prevent gas leakage. The sealing ring is made of a high-temperature resistant material. Multiple slits 52 are formed at the end of the movable connector 5 furthest from the connecting pipe 4. The slits 52 extend in the same direction as the axial direction of the movable connector 5, and are spaced apart around the central axis of the movable connector 5. The end of the movable connector 5 furthest from the connecting pipe 4 is divided into multiple pressing claws 51 by the slits 52. The movable connector 5 is used to fit over the vehicle exhaust pipe 7. When the movable connector 5 is fitted over the vehicle exhaust pipe 7, the pressing claws 51 can press against the outer surface of the vehicle exhaust pipe 7, thereby increasing the friction between the movable connector 5 and the vehicle exhaust pipe 7 and preventing the movable connector 5 from detaching from the vehicle exhaust pipe 7. When the movable connector 5 is fitted over the vehicle's exhaust pipe 7, the exhaust gas emitted from the exhaust pipe 7 enters the movable connector 5, then passes sequentially through the connecting pipe 4, the base 1, and the deflector pipe 2, finally exiting from the deflector pipe 2. A detection device can be connected to the end of the deflector pipe 2 furthest from the base 1, allowing the exhaust gas output from the deflector pipe 2 to enter and be detected.

[0029] See Figure 1-2The adjusting member 6 can be fitted over the movable joint 5 and cover all the slits 52. The adjusting member 6 is used to adjust the diameter of the movable joint 5. When the diameter of the movable joint 5 is at its maximum, the movable joint 5 can be directly fitted over the car exhaust pipe 7. The adjusting member 6 then reduces the diameter of the movable joint 5, the width of the slits 52 decreases, and the pressing claws 51 press tightly against the outer surface of the car exhaust pipe 7, so that the movable joint 5 is firmly fixed to the outside of the exhaust pipe 7. And because the adjusting member 6 can cover all the slits 52, the exhaust gas discharged from the car exhaust pipe 7 will not leak out through the slits 52, ensuring that the exhaust gas can enter the connecting pipe 4 through the movable joint 5.

[0030] This application utilizes multiple slits 52 at the end of the movable joint 5 furthest from the connecting pipe 4 to allow the adjusting member 6 to be fitted over the movable joint 5. When the connecting pipe 4 needs to be installed on the vehicle exhaust pipe 7, the diameter of the movable joint 5 is reduced by the adjusting member 6, causing the movable joint 5 to be tightly pressed against the vehicle exhaust pipe 7. This ensures a tight connection between the movable joint 5 and the vehicle exhaust pipe 7. Furthermore, since the adjusting member 6 can cover all the slits 52, it ensures that the exhaust gas emitted from the vehicle exhaust pipe 7 will not leak from the slits 52, thus ensuring the accuracy of the exhaust gas test data. This achieves a fast, convenient, and reliably sealed installation of the vehicle exhaust gas sampling docking device and the vehicle exhaust pipe 7.

[0031] See Figure 1 The movable connector 5 is provided with at least one positioning arm at the end away from the connecting pipe 4. The positioning arm is detachably connected to the vehicle exhaust pipe 7 to position the movable connector 5 on the vehicle exhaust pipe 7. When it is necessary to install the movable connector 5 on the vehicle exhaust pipe 7, the positioning arm can be connected to the vehicle exhaust pipe 7 first to perform initial positioning of the movable connector 5, so that the staff can then firmly fix the movable connector 5 on the vehicle exhaust pipe 7.

[0032] See Figure 1 In some embodiments, the positioning arm is equipped with a magnet for attaching to the outer surface of the vehicle exhaust pipe 7. Attaching the positioning arm to the outer surface of the vehicle exhaust pipe 7 via the magnet completes the initial positioning of the movable connector 5 and facilitates the subsequent removal of the positioning arm from the vehicle exhaust pipe 7. The magnet is made of high-performance neodymium iron boron material to ensure strong magnetism and stability. See Figure 1 There are multiple positioning arms, which are distributed at intervals around the central axis of the movable joint 5. When the movable joint 5 needs to be initially positioned, the multiple positioning arms can be attached to the outer surface of the car exhaust pipe 7 around the car exhaust pipe 7, thereby strengthening the fixing effect of the initial positioning and preventing the movable joint 5 from falling off the car exhaust pipe 7.

[0033] See Figure 1The end of the movable joint 5 furthest from the connecting pipe 4 is frustoconical, and the diameter of the end of the movable joint 5 furthest from the connecting pipe 4 is smaller the further it is from the base 1. The closer the adjusting member 6 is to the base 1, the greater the pressure of the adjusting member 6 on the movable joint 5, and the more tightly the movable joint 5 presses against the automobile exhaust pipe 7.

[0034] See Figure 1 In some embodiments, the adjusting member 6 is made of an elastic material, wherein the adjusting member 6 may be made of high temperature resistant and corrosion resistant rubber. When the adjusting member 6 is fitted over the movable joint 5, the adjusting member 6 can use its elasticity to firmly fit the movable joint 5 over the vehicle exhaust pipe 7.

[0035] In some embodiments, the outer surface of the movable connector 5 away from the connecting pipe 4 has an external thread, the adjusting member 6 is annular, the inner surface of the adjusting member 6 is funnel-shaped, and the inner surface of the adjusting member 6 has an internal thread. The adjusting member 6 is screwed onto the end of the movable connector 5 away from the connecting pipe 4. When the operator needs to firmly fix the movable connector 5 to the vehicle exhaust pipe 7, the adjusting member 6 can be tightened to rotate it towards the base 1, thereby making the movable connector 5 press more tightly against the outer surface of the vehicle exhaust pipe 7. When it is necessary to disconnect the movable connector 5 from the vehicle exhaust pipe 7, the operator can loosen the adjusting member 6 to rotate it away from the base 1, and the movable connector 5 will gradually loosen from the vehicle exhaust pipe 7. The operator can then pull the movable connector 5 off the vehicle exhaust pipe 7.

[0036] See Figure 1 and Figure 2The bracket 3 includes a first connecting arm 31, a second connecting arm 32, a third connecting arm 33, a fourth connecting arm 34, a first fixing member, a second fixing member, and a third fixing member. One end of the first connecting arm 31 is connected to the base 1, the end of the first connecting arm 31 away from the base 1 is hinged to the second connecting arm 32, the end of the second connecting arm 32 away from the first connecting arm 31 is hinged to the third connecting arm 33, the end of the third connecting arm 33 away from the second connecting arm 32 is hinged to the fourth connecting arm 34, and the end of the fourth connecting arm 34 away from the third connecting arm 33 is connected to the deflector tube 2. The first fixing member is installed at the hinge joint of the first connecting arm 31 and the second connecting arm 32, and is used to fix the relative angle between the first connecting arm 31 and the second connecting arm 32. The second fixing member is installed at the hinge joint of the second connecting arm 32 and the third connecting arm 33, and is used to fix the relative angle between the second connecting arm 32 and the third connecting arm 33. The third fixing member is installed at the hinge joint of the third connecting arm 33 and the fourth connecting arm 34, and is used to fix the relative angle between the third connecting arm 33 and the fourth connecting arm 34. The first, second, and third fixing members can be bolts. By tightening or loosening the first, second, and third fixing members, the operator can adjust the fixing strength between the first connecting arm 31 and the second connecting arm 32, the second connecting arm 32 and the third connecting arm 33, and the third connecting arm 33 and the fourth connecting arm 34, respectively. The first connecting arm 31, the second connecting arm 32, the third connecting arm 33, and the fourth connecting arm 34 are made of carbon fiber or high-strength alloy materials, and are lightweight and high-strength. They are designed with multiple switches to support the adjustment of the deflector tube 2 in multiple directions.

[0037] See Figure 1 A first pivot is provided at the hinge joint between the first connecting arm 31 and the second connecting arm 32, around which the first connecting arm 31 rotates. A second pivot is provided at the hinge joint between the second connecting arm 32 and the third connecting arm 33, around which the second connecting arm 32 rotates. A third pivot is provided at the hinge joint between the third connecting arm 33 and the fourth connecting arm 34, around which the third connecting arm 33 rotates. The axial direction of the first pivot is perpendicular to the axial direction of the second pivot, and the axial direction of the second pivot is perpendicular to the axial direction of the third pivot. The first, second, and third pivots allow the bracket 3 to rotate at multiple angles, enabling the bracket 3 to adapt to the bending of the deflector 2 to accommodate positional deviations of different vehicle models and exhaust pipe 7.

[0038] See Figure 1The deflector 2 includes a first straight pipe 21, a corrugated pipe 22, and a second straight pipe 23, all of which are made of metal. The first straight pipe 21 is connected to both the bracket 3 and the base 1. The corrugated pipe 22 is connected to both the first straight pipe 21 and the second straight pipe 23. The second straight pipe 23 is connected to the bracket 3. The corrugated pipe 22 can be bent in multiple directions. The first straight pipe 21 and the second straight pipe 23 extend in a straight line. Both the first straight pipe 21 and the second straight pipe 23 possess a certain structural strength, thereby ensuring the structural strength at the connection between the first straight pipe 21 and the base 1, and ensuring the structural strength at the connection between the second straight pipe 23 and the bracket 3.

[0039] In some embodiments, the surface of the movable connector 5 is provided with a groove, and the inner surface of the adjusting member 6 is provided with a rib. The rib is embedded in the groove, and the rib is tightly engaged with the groove to prevent the adjusting member 6 from slipping off the movable connector 5 when the exhaust pipe vibrates.

[0040] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application embodiment can be combined, divided, and deleted according to actual needs.

[0041] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A vehicle-mounted exhaust gas sampling docking device, characterized in that, include: Base; A deflector, one end of which is connected to the base; A bracket, one end of which is connected to the base, and the other end of which is connected to the end of the deflector tube away from the base, the bracket supporting the deflector tube; The connecting pipe has one end connected to the base; A movable connector is connected to the end of the connecting pipe away from the base. The end of the movable connector away from the connecting pipe has multiple slits. The extension direction of the slits is the same as the axial direction of the movable connector. The multiple slits are distributed at intervals around the central axis of the movable connector. The movable connector is used to fit over the exhaust pipe of an automobile. An adjusting member is fitted over the movable joint, covers the slit, and is used to adjust the diameter of the movable joint.

2. The vehicle-mounted exhaust gas sampling docking device according to claim 1, characterized in that: The movable joint is provided with at least one positioning arm at the end away from the connecting pipe. The positioning arm is detachably connected to the vehicle exhaust pipe to position the movable joint on the vehicle exhaust pipe.

3. The vehicle-mounted exhaust gas sampling docking device according to claim 2, characterized in that: The positioning arm is equipped with a magnet, which is used to attach to the outer surface of the vehicle's exhaust pipe.

4. The vehicle-mounted exhaust gas sampling docking device according to claim 3, characterized in that: The positioning arms are multiple, and the multiple positioning arms are distributed at intervals around the central axis of the movable joint.

5. The vehicle-mounted exhaust gas sampling docking device according to claim 1, characterized in that: The adjusting element is made of an elastic material.

6. The vehicle-mounted exhaust gas sampling docking device according to claim 1, characterized in that: The end of the movable joint away from the connecting pipe is frustum-shaped, and the outer surface of the end of the movable joint away from the connecting pipe is provided with external threads. The adjusting member is annular, and the inner surface of the adjusting member is funnel-shaped and provided with internal threads. The adjusting member is screwed onto the end of the movable joint away from the connecting pipe.

7. The vehicle-mounted exhaust gas sampling docking device according to claim 1, characterized in that: The bracket includes a first connecting arm, a second connecting arm, a third connecting arm, a fourth connecting arm, a first fixing member, a second fixing member, and a third fixing member; One end of the first connecting arm is connected to the base, the end of the first connecting arm away from the base is hinged to the second connecting arm, the end of the second connecting arm away from the first connecting arm is hinged to the third connecting arm, the end of the third connecting arm away from the second connecting arm is hinged to the fourth connecting arm, and the end of the fourth connecting arm away from the third connecting arm is connected to the deflector. A first fixing member is installed at the hinge joint between the first connecting arm and the second connecting arm, and the first fixing member is used to fix the relative angle between the first connecting arm and the second connecting arm. A second fixing member is installed at the hinge joint between the second connecting arm and the third connecting arm, and the second fixing member is used to fix the relative angle between the second connecting arm and the third connecting arm. A third fixing member is installed at the hinge joint between the third connecting arm and the fourth connecting arm, and the third fixing member is used to fix the relative angle between the third connecting arm and the fourth connecting arm.

8. The vehicle-mounted exhaust gas sampling docking device according to claim 7, characterized in that: A first pivot is provided at the hinge joint between the first connecting arm and the second connecting arm, and the first connecting arm rotates around the first pivot. A second pivot is provided at the hinge joint between the second connecting arm and the third connecting arm, and the second connecting arm rotates around the second pivot. A third pivot is provided at the hinge joint between the third connecting arm and the fourth connecting arm, and the third connecting arm rotates around the third pivot. The axial direction of the first pivot is perpendicular to the axial direction of the second pivot, and the axial direction of the second pivot is perpendicular to the axial direction of the third pivot.

9. The vehicle-mounted exhaust gas sampling docking device according to claim 7, characterized in that: The deflector includes a first straight pipe, a corrugated pipe, and a second straight pipe. The first straight pipe is connected to the bracket and the base, the corrugated pipe is connected to the first straight pipe and the second straight pipe, and the second straight pipe is connected to the bracket.

10. The vehicle-mounted exhaust gas sampling docking device according to claim 1, characterized in that: The surface of the movable joint is provided with a groove, and the inner surface of the adjusting member is provided with a rib, which is embedded in the groove.

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