Equipment for detecting exhaust emission of motor vehicle

Abstract

The invention provides equipment for motor vehicle exhaust emission detection, and belongs to the technical field of motor vehicle exhaust detection. According to the technical scheme, the device comprises a trolley, a tail gas collecting mechanism is arranged on the trolley, a gas outlet is formed in the tail gas collecting mechanism, and the gas outlet is connected to a detector through a first pipeline; the tail gas collecting mechanism comprises a mixing box, communicated air inlets are formed in the left side face and the right side face of the mixing box correspondingly, a communicated air outlet is formed in the rear side face, away from the motor vehicle, of the mixing box, a transverse rod is arranged on the front side face of the mixing box, and a pair of connector mechanisms connected with a tail pipe of the motor vehicle is arranged on the transverse rod. A second pipeline is arranged between the rear end of the round pipe and the air inlet in the corresponding side for connection, and the front end of the round pipe is connected to the tail pipe of the motor vehicle. The double-exhaust-pipe motor vehicle emission detection device has the advantages that emission detection of a double-exhaust-pipe motor vehicle is achieved through the arrangement of the pair of connector mechanisms, and a guarantee is provided for the authenticity of data.

Description

Technical Field

[0001] The present invention relates to the technical field of motor vehicle exhaust gas detection, and particularly to a device for detecting motor vehicle exhaust gas emissions. Background Art

[0002] The exhaust gas emitted by automobiles mainly consists of carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NO X ) etc. When they accumulate in the air to a certain extent and under the action of sunlight, nitrogen compounds and hydrocarbons will react to form photochemical smog containing nitrogen dioxide (NO 2 ) and ozone (O 3 ). These two substances are both insoluble in water and can directly enter the lungs when inhaled by the human body. When the concentration is high, it can cause toxic edema. Entering the blood can form methemoglobin, causing tissue hypoxia, which is extremely harmful to people's health. In addition, hydrogen oxides will form acid rain after entering the atmosphere, harming the ecological environment.

[0003] In the environmental protection detection of motor vehicles, for vehicles with dual exhaust pipes, the detection specifications usually require sampling the exhaust gas from both exhaust pipes simultaneously to ensure the accuracy and comprehensiveness of the detection results. This is because vehicles with dual exhaust pipes often have two independent exhaust systems, and each system may affect the overall emission level. Therefore, it is usually necessary to use a Y-shaped or multi-way extension pipe to collect the exhaust gas into the same tail pipe and use a single sampling probe for detection. However, in the actual detection process, there are no relatively mature related devices, so there are problems such as inconvenient connection and fixation of related pipelines. Therefore, the present invention provides a device for detecting motor vehicle exhaust gas emissions. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for detecting motor vehicle exhaust gas emissions that is simple to operate and is used for detecting vehicles with dual exhaust pipes.

[0005] The present invention is achieved by the following measures: A device for detecting motor vehicle exhaust gas emissions, characterized in that it includes a trolley, a tail gas collection mechanism is arranged on the trolley, an air outlet is arranged on the tail gas collection mechanism, and the air outlet is connected to a detector through a pipeline one; The exhaust gas collection mechanism includes a mixing box. On the left and right side surfaces of the mixing box, there are connected air inlets. On the rear side surface of the mixing box away from the motor vehicle, there is the connected air outlet. On the front side surface of the mixing box, there is a cross bar. On the cross bar, there is a pair of joint mechanisms connected to the tail pipes of the motor vehicle. The joint mechanism includes a circular pipe. Between the rear end of the circular pipe and the corresponding side air inlet, there is a second pipeline connected. The front end of the circular pipe is connected to the tail pipe of the motor vehicle. The two joint mechanisms collect the exhaust gas discharged from the two side tail pipes, then enter the mixing box, and finally flow to the detector through the first pipeline for detection.

[0006] The specific features of the present invention also include: On the front side surface of the cross bar, there is a first T-shaped sliding groove; The joint mechanism further includes a first T-shaped slider slidably arranged in the first T-shaped sliding groove. On the first T-shaped slider, there is a first U-shaped frame. Between the two side edges inside the first U-shaped frame, there is a circular frame rotatably arranged. Inside the circular frame, there is the circular pipe. By sliding the first T-shaped slider, the position of the joint mechanism can be slidably adjusted according to the positions of the two tail pipes of the motor vehicle.

[0007] On the first T-shaped slider, there is an extension block. On the extension block, there is a through first sliding groove. Inside the first sliding groove, there is a vertical rod slidably arranged. At the upper end of the vertical rod, there is a second U-shaped frame. On the opposite inner side surfaces of the two side edges of the second U-shaped frame, there are circular shafts respectively. On the circular frame, there are symmetrically arranged a pair of fixed rods in the same direction as the axis of the circular pipe. On the outer side surfaces of the two side fixed rods, there are second sliding grooves matching with the circular shafts. The circular shafts are movably arranged in the corresponding second sliding grooves. By sliding the vertical rod up and down, the angle of the circular pipe can be adjusted according to the angle of the tail pipe of the motor vehicle.

[0008] The joint mechanism further includes a locking mechanism. The locking mechanism includes an installation groove provided inside the extension block. During specific manufacturing, the extension block can be divided into two parts. After opening the installation groove and installing the corresponding components, the two parts are combined and docked. A gear is provided in the middle of the installation groove through a rotating shaft. An upper T-shaped groove is provided on the upper side of the installation groove. A mating upper T-shaped plate is slidably provided in the upper T-shaped groove. An upper rack that meshes with the gear is provided on the upper T-shaped plate. A front pressing portion is provided on the front end face of the upper T-shaped plate. A third chute that cooperates with the front pressing portion and penetrates into the first chute is provided on the front side face inside the installation groove. The front pressing portion passes through the third chute and presses against the side face of the vertical rod. The side face of the vertical rod is a smooth surface, realizing the locking of the vertical rod, thereby realizing the retention and fixation of the circular tube at a suitable angle. A first spring is provided between the rear end face of the upper T-shaped plate and the rear side face of the installation groove. One end of the first spring is fixed on the upper T-shaped plate, and the other end of the first spring is fixed on the rear side face of the installation groove. Under the action of the first spring, the front pressing portion presses against the side face of the vertical rod; A lower T-shaped groove is provided on the lower side of the installation groove. A mating lower T-shaped plate is slidably provided in the lower T-shaped groove. A lower rack that meshes with the gear is provided on the lower T-shaped plate. A fourth chute that penetrates through the first T-shaped slider and communicates with the first T-shaped chute is provided on the rear side face of the installation groove. An auxiliary rod is provided on the rear end face of the lower T-shaped plate. The free end face of the auxiliary rod slidably passes through the fourth chute and is provided with a rear pressing portion that cooperates with the inner side face of the first T-shaped chute. The rear pressing portion presses against the inner side face of the first T-shaped chute, thereby realizing the locking and fixation of the first T-shaped slider, and thus realizing the locking and fixation of the joint mechanism in the left-right direction. A second spring is provided between the front end face of the lower T-shaped plate and the front side face of the installation groove. One end of the second spring is fixed on the lower T-shaped plate, and the other end of the second spring is fixed on the front side face of the installation groove. Under the action of the second spring, the rear pressing portion presses against the inner side face of the first T-shaped chute; Both the front pressing portion and the rear pressing portion include a pressing plate, and a rubber block with a rough surface is provided on the pressing plate; One end of the rotating shaft extends to the outside of the extension block and is provided with a handle. The two handles are provided on the opposite outer side faces of the two extension blocks. By rotating the handle, the rotating shaft rotates, and then the gear rotates, which can release the pressing of the front pressing portion and the rear pressing portion on the corresponding components, so that the angle and the position in the left-right direction of the circular tube can be adjusted simultaneously. During adjustment, one hand rotates the handle and keeps it still, and the other hand operates the circular tube.

[0009] Both the front pressing part and the rear pressing part include fixing plates. In the middle of the front side of the fixing plate, there is a pressing plate. On the fixing plates on both sides of the pressing plate, a number of vacuum suction cups are arranged. The material of the vacuum suction cups is made of nitrile rubber. The vacuum suction cups are pressed on the corresponding sides to achieve locking and fixing.

[0010] On the side surfaces of both fixing plates, there are sliding grooves five. In the middle of a number of the vacuum suction cups, there are vent holes that penetrate into the sliding grooves five. In both sliding grooves five, there are slidingly arranged matching plugging blocks. On the bottom surfaces of both sliding grooves five, there are through holes for the entry of gas. When the plugging blocks are in the sliding grooves five, they can block the vent holes to ensure the effective adsorption of the vacuum suction cups. When the plugging blocks slide outwards, air enters the vacuum suction cups through the through holes and the vent holes, causing the vacuum suction cups to lose their adsorption force, thereby releasing the locking and fixing of the corresponding components. On the inner side surface of the extension block, there is a pair of sliding grooves six and seven that respectively cooperate with the front pressing part and the rear pressing part and penetrate into the corresponding sliding grooves three and four. The outer ends of both plugging blocks respectively pass through the sliding grooves six and seven and are respectively provided with rod one and rod two. Rod one and rod two are slidingly sleeved. On one side of rod one, there is an extension plate. On the corresponding side surface of the extension block, there is a T-shaped sliding groove two. In the T-shaped sliding groove two, there is a slidingly arranged matching T-shaped slider two. Between the T-shaped slider two and the extension plate, there is a pair of telescopic rods one. The telescopic rod one includes a tube and a rod slidingly sleeved in the tube. The telescopic rod one serves to connect the T-shaped slider two and the extension plate into a whole. Between a pair of telescopic rods one, there is a spring three. One end of the spring three is fixed on the T-shaped slider two, and the other end of the spring three is fixed on the extension plate. The spring three causes the two plugging blocks to remain in the corresponding sliding grooves five on both sides.

[0011] On the extension plate, there is a push rod. When adjusting the joint mechanism, first push the push rod to make a number of the vacuum suction cups fill with air, thereby losing their adsorption force. Then rotate the handle. Finally, adjust the angle of the round tube and the position of the joint mechanism. After adjustment, release the handle. Under the action of the spring one and the spring two, the front pressing part and the rear pressing part respectively achieve the locking and fixing of the angle of the round tube and the joint mechanism.

[0012] On the trolley, there is a pair of telescopic rods two. On the pair of telescopic rods two, there is a mixing box. Between the pair of telescopic rods two, there is an electric telescopic rod. The lower end of the electric telescopic rod is fixed on the trolley, and the upper end of the electric telescopic rod is fixed on the mixing box. The height of the joint mechanism can be adjusted through the electric telescopic rod, and the telescopic rod two plays an auxiliary supporting role.

[0013] The front end of the circular pipe is provided with a rubber pipe joint with a variable diameter and matched with the tail pipe. The rubber pipe joint is fixed on the tail pipe and the circular pipe through a clamp. When detecting, a suitable rubber pipe joint can be selected according to the outer diameter of the tail pipe.

[0014] The beneficial effects of the present invention are as follows: Through the pair of joint mechanisms provided in this solution, the emission detection of motor vehicles with double exhaust pipes is realized, which guarantees the authenticity of the data. In addition, the circular pipe of this solution can not only be adjusted in the left - right direction, but also in terms of angle, which guarantees the smooth connection between the circular pipe and the tail pipe. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0016] Figure 2 It is Figure 1 an enlarged view of A in

[0017] Figure 3 It is Figure 2 an enlarged view of C in

[0018] Figure 4 It is Figure 1 an enlarged view of B in

[0019] Figure 5 It is a schematic diagram of the connection of relevant internal components after the extension block of the embodiment of the present invention is sectioned.

[0020] Figure 6 It is a schematic diagram of the rear pressing part of the embodiment of the present invention.

[0021] Figure 7 It is a schematic diagram of the assembly of the plugging block, the front pressing part and the rear pressing part of the embodiment of the present invention.

[0022] Figure 8 It is a schematic diagram of the outside of the extension block of the embodiment of the present invention.

[0023] Among them, the reference numerals are: 1, trolley; 2, air outlet; 3, mixing box; 4, air inlet; 5, cross bar; 6, first T-shaped chute; 7, first U-shaped frame; 8, annular frame; 9, round tube; 10, rubber hose joint; 11, second telescopic rod; 12, electric telescopic rod; 13, second U-shaped frame; 14, round shaft; 15, fixed rod; 16, second chute; 17, vertical rod; 18, handle; 19, push rod; 20, extension block; 21, second T-shaped slider; 22, first telescopic rod; 23, third spring; 24, extension plate; 25, sealing block; 26, sixth chute; 27, first chute; 28, upper T-shaped plate; 29, upper rack; 30, gear; 31, first spring; 32, first T-shaped slider; 33, auxiliary rod; 34, lower rack; 35, lower T-shaped plate; 36, second spring; 37, fixing plate; 38, pressing plate; 40, seventh chute; 41, vacuum sucker; 42, first rod; 43, second rod. Detailed implementation manners

[0024] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0025] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. 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.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" 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 through specific situations.

[0027] To clearly illustrate the technical features of this solution, the following elaborates on this solution through specific implementation manners.

[0028] Example 1: Refer to Figure 1 , a device for detecting motor vehicle exhaust emissions, including a trolley 1, on which an exhaust gas collection mechanism is provided. An air outlet 2 is provided on the exhaust gas collection mechanism, and the air outlet 2 is connected to a detector through a set pipeline 1; The exhaust gas collection mechanism includes a mixing box 3. On both left and right side surfaces of the mixing box 3, there are connected air inlets 4. On the rear side surface of the mixing box 3 away from the motor vehicle, there is a connected air outlet 2. On the front side surface of the mixing box 3, there is a cross bar 5. On the cross bar 5, there is a pair of joint mechanisms connected to the motor vehicle tail pipes. The joint mechanism includes a round pipe 9. A pipeline 2 is provided between the rear end of the round pipe 9 and the corresponding side air inlet 4. The front end of the round pipe 9 is connected to the motor vehicle tail pipe. The two joint mechanisms collect the exhaust gases discharged from the two side tail pipes, then enter the mixing box 3, and finally flow to the detector through the pipeline 1 for detection.

[0029] Example 2: Refer to Figures 1-8 , a device for detecting motor vehicle exhaust emissions, including a trolley 1, on which an exhaust gas collection mechanism is provided. An air outlet 2 is provided on the exhaust gas collection mechanism, and the air outlet 2 is connected to a detector through a set pipeline 1; The exhaust gas collection mechanism includes a mixing box 3. On both left and right side surfaces of the mixing box 3, there are connected air inlets 4. On the rear side surface of the mixing box 3 away from the motor vehicle, there is a connected air outlet 2. On the front side surface of the mixing box 3, there is a cross bar 5. On the cross bar 5, there is a pair of joint mechanisms connected to the motor vehicle tail pipes. The joint mechanism includes a round pipe 9. A pipeline 2 is provided between the rear end of the round pipe 9 and the corresponding side air inlet 4. The front end of the round pipe 9 is connected to the motor vehicle tail pipe. The two joint mechanisms collect the exhaust gases discharged from the two side tail pipes, then enter the mixing box 3, and finally flow to the detector through the pipeline 1 for detection.

[0030] On the front side surface of the cross bar 5, there is a T-shaped chute 1 6; The joint mechanism further includes a T-shaped slider 1 32 slidably arranged in the T-shaped chute 1 6. On the T-shaped slider 1 32, there is a U-shaped frame 1 7. Between two side edges inside the U-shaped frame 1 7, there is a rotatably arranged annular frame 8. Inside the annular frame 8, there is a round pipe 9. By sliding the T-shaped slider 1 32, the position of the joint mechanism can be slidably adjusted according to the positions of the two motor vehicle tail pipes.

[0031] An extension block 20 is provided on the T-shaped slider 32. A through chute 27 is provided on the extension block 20. A vertical rod 17 is slidably arranged in the chute 27. A U-shaped frame 13 is provided at the upper end of the vertical rod 17. Circular shafts 14 are provided on the inner side surfaces of the two side edges of the U-shaped frame 13 facing each other. A pair of fixing rods 15 parallel to the axis of the circular tube 9 are symmetrically arranged on the annular frame 8. Chutes 16 cooperating with the circular shafts 14 are provided on the outer side surfaces of the two fixing rods 15. The circular shafts 14 are movably arranged in the corresponding side chutes 16. By sliding the vertical rod 17 up and down, the angle of the circular tube 9 can be adjusted according to the angle of the motor vehicle tail pipe.

[0032] The joint mechanism further includes a locking mechanism. The locking mechanism includes an installation groove provided inside the extension block 20. During specific manufacturing, the extension block 20 can be divided into two parts. After opening the installation groove and installing the corresponding components, the two parts are combined and docked. A gear 30 is arranged in the middle of the installation groove through a rotating shaft. An upper T-shaped groove is provided on the upper side of the installation groove. A cooperating upper T-shaped plate 28 is slidably arranged in the upper T-shaped groove. An upper rack 29 meshing with the gear 30 is provided on the upper T-shaped plate 28. A front pressing part is provided on the front end surface of the upper T-shaped plate 28. A chute 3 is provided on the front side surface inside the installation groove and communicates with the chute 27. The front pressing part passes through the chute 3 and presses against the side surface of the vertical rod 17. The side surface of the vertical rod 17 is a smooth surface, realizing the locking of the vertical rod 17, thereby realizing the fixing of the circular tube 9 at a suitable angle. A spring 31 is arranged between the rear end surface of the upper T-shaped plate 28 and the rear side surface of the installation groove. One end of the spring 31 is fixed on the upper T-shaped plate 28, and the other end of the spring 31 is fixed on the rear side surface of the installation groove. Under the action of the spring 31, the front pressing part presses against the side surface of the vertical rod 17; A lower T-shaped groove is provided on the lower side of the installation groove. A cooperating lower T-shaped plate 35 is slidably arranged in the lower T-shaped groove. A lower rack 34 meshing with the gear 30 is provided on the lower T-shaped plate 35. A chute 4 is provided on the rear side surface of the installation groove and penetrates through the T-shaped slider 32 and communicates with the T-shaped chute 6. An auxiliary rod 33 is provided on the rear end surface of the lower T-shaped plate 35. The free end surface of the auxiliary rod 33 slides through the chute 4 and is provided with a rear pressing part cooperating with the inner side surface of the T-shaped chute 6. The rear pressing part presses against the inner side surface of the T-shaped chute 6, thereby realizing the locking and fixing of the T-shaped slider 32, and thus realizing the locking and fixing of the joint mechanism in the left-right direction. A spring 36 is arranged between the front end surface of the lower T-shaped plate 35 and the front side surface of the installation groove. One end of the spring 36 is fixed on the lower T-shaped plate 35, and the other end of the spring 36 is fixed on the front side surface of the installation groove. Under the action of the spring 36, the rear pressing part presses against the inner side surface of the T-shaped chute 6; Both the front pressing part and the rear pressing part include a pressing plate 38, and a rubber block with a rough surface is provided on the pressing plate 38; One end of the rotating shaft extends outside the extension block 20 and is provided with a handle 18. The two handles 18 are arranged on the opposite outer side surfaces of the two extension blocks 20. By rotating the handle 18, the rotating shaft rotates, thereby driving the gear 30 to rotate, and then the pressing of the front pressing part and the rear pressing part on the corresponding components can be released, so that the angle and the position in the left - right direction of the round tube 9 can be adjusted simultaneously. When adjusting, hold one hand on the rotating shaft handle 18 and keep it still, and operate the round tube 9 with the other hand.

[0033] Both the front pressing part and the rear pressing part include a fixing plate 37. In the middle of the front side surface of the fixing plate 37, a pressing plate 38 is provided. On the fixing plate 37 on both sides of the pressing plate 38, a number of vacuum suction cups 41 are provided. The material of the vacuum suction cups 41 is made of nitrile rubber. The vacuum suction cups 41 are pressed on the corresponding side surfaces to achieve locking and fixing.

[0034] On the side surfaces of the two fixing plates 37, a fifth chute is provided. In the middle of a number of vacuum suction cups 41, air holes penetrating into the fifth chute are provided. In the two fifth chutes, a matching plug block 25 is slidably arranged. On the bottom surfaces of the two fifth chutes, through holes for the entry of gas are provided. When the plug block 25 is in the fifth chute, the air holes can be blocked to ensure the effective adsorption of the vacuum suction cups 41. When the plug block 25 slides outwards, air enters the vacuum suction cups 41 through the through holes and the air holes, so that the vacuum suction cups 41 lose their adsorption force, thereby releasing the locking and fixing of the corresponding components. On the inner side surface of the extension block 20, a pair of sixth chutes 26 and seventh chutes 40 are provided, which respectively cooperate with the front pressing part and the rear pressing part and penetrate into the corresponding third chute and fourth chute. The outer ends of the two plug blocks 25 respectively penetrate out of the sixth chute 26 and the seventh chute 40 and are respectively provided with a first rod 42 and a second rod 43. The first rod 42 and the second rod 43 are slidably sleeved. On one side of the first rod 42, an extension plate 24 is provided. On the corresponding side surface of the extension block 20, a second T - shaped chute is provided. In the second T - shaped chute, a matching second T - shaped slider 21 is slidably arranged. Between the second T - shaped slider 21 and the extension plate 24, a pair of first telescopic rods 22 are provided. The first telescopic rod 22 includes a tube and a rod slidably sleeved in the tube. The first telescopic rod 22 plays a role in connecting the second T - shaped slider 21 and the extension plate 24 into a whole. Between the pair of first telescopic rods 22, a third spring 23 is provided. One end of the third spring 23 is fixed on the second T - shaped slider 21, and the other end of the third spring 23 is fixed on the extension plate 24. The third spring 23 keeps the two plug blocks 25 in the corresponding fifth chutes on both sides.

[0035] A push rod 19 is provided on the extension plate 24. When adjusting the docking head mechanism, first push the push rod 19 to make a number of vacuum suction cups 41 filled with air, so that they lose the adsorption force. Then rotate the handle 18. Finally, adjust the angle of the circular tube 9 and the position of the docking head mechanism. After adjustment, loosen the handle 18. Under the action of the first spring 31 and the second spring 36, the front pressing part and the rear pressing part respectively lock and fix the angle of the circular tube 9 and the docking head mechanism.

[0036] A pair of second telescopic rods 11 are provided on the trolley 1. A mixing tank 3 is provided on the pair of second telescopic rods 11. An electric telescopic rod 12 is provided between the pair of second telescopic rods 11. The lower end of the electric telescopic rod 12 is fixed on the trolley 1, and the upper end of the electric telescopic rod 12 is fixed on the mixing tank 3. The height of the docking head mechanism can be adjusted by the electric telescopic rod 12, and the second telescopic rods 11 play an auxiliary supporting role.

[0037] A rubber tube joint 10 with a variable diameter and matching with the tail tube is provided at the front end of the circular tube 9. The rubber tube joint 10 is fixed on the tail tube and the circular tube 9 through a clamp. When detecting, a suitable rubber tube joint 10 can be selected according to the outer diameter of the tail tube.

[0038] When in use, first push the device to the rear of the motor vehicle and adjust the second telescopic rods 11 according to the height of the tail tube. When adjusting the docking head mechanism, first push the push rod 19 to make a number of vacuum suction cups 41 filled with air, so that they lose the adsorption force. Then rotate the handle 18. Finally, adjust the angle of the circular tube 9 and the position of the docking head mechanism. After adjustment, loosen the handle 18. Under the action of the first spring 31 and the second spring 36, the front pressing part and the rear pressing part respectively lock and fix the angle of the circular tube 9 and the docking head mechanism.

[0039] The technical features not described in the present invention can be realized by or adopted the prior art, and will not be elaborated here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present invention should also fall within the protection scope of the present invention.

Claims

1. A motor vehicle exhaust emission detection device, characterized in that: The invention comprises a trolley (1), wherein the trolley (1) is provided with an exhaust gas collection mechanism, wherein the exhaust gas collection mechanism is provided with an air outlet (2), and wherein the air outlet (2) is connected to a detector via a provided pipeline 1; The exhaust gas collection mechanism comprises a mixing box (3), the left and right side surfaces of the mixing box (3) are both provided with connected air inlets (4), the rear side surface of the mixing box (3) away from the motor vehicle is provided with the connected air outlet (2), the front side surface of the mixing box (3) is provided with a cross bar (5), the cross bar (5) is provided with a pair of joint mechanisms connected to the tail pipe of the motor vehicle, the joint mechanism comprises a round tube (9), a pipeline connection is provided between the rear end of the round tube (9) and the air inlet (4) on the corresponding side, and the front end of the round tube (9) is connected to the tail pipe of the motor vehicle.

2. The vehicle exhaust emission detection device according to claim 1, characterized in that: A T-shaped slide groove (6) is provided on the front side of the cross bar (5); The joint mechanism also includes a T-shaped slider (32) slidably arranged in the T-shaped slide groove (6), a U-shaped frame (7) is arranged on the T-shaped slider (32), an annular frame (8) is rotatably arranged between two side edges in the U-shaped frame (7), and the circular tube (9) is arranged in the annular frame (8).

3. The vehicle exhaust emission detection device according to claim 2, characterized in that: The T-shaped slider (32) is provided with an extension block (20), the extension block (20) is provided with a through slide groove (27), a vertical rod (17) is slidably provided in the slide groove (27), a U-shaped frame (13) is provided at the upper end of the vertical rod (17), a circular shaft (14) is provided on the inner side surfaces of the two sides of the U-shaped frame (13), a pair of fixed rods (15) are symmetrically provided on the annular frame (8) and are in the same direction as the axis of the circular tube (9), and the outer sides of the fixed rods (15) on both sides are provided with slide grooves (16) matching with the circular shaft (14), and the circular shaft (14) is movably arranged in the slide grooves (16) on the corresponding side.

4. The vehicle exhaust emission detection device according to claim 3, characterized in that: The joint mechanism also includes a locking mechanism, which includes a mounting groove arranged inside the extension block (20), a gear (30) being arranged in the middle of the mounting groove through a rotating shaft, an upper T-shaped groove being arranged on the upper side of the mounting groove, a matching upper T-shaped plate (28) being slidably arranged in the upper T-shaped groove, an upper rack (29) meshing with the gear (30) being arranged on the upper T-shaped plate (28), and a front pressing portion being arranged on the front end surface of the upper T-shaped plate (28). A slide groove three is provided on the front side surface of the installation groove, which cooperates with the front pressing part and passes through the slide groove one (27); the front pressing part passes through the slide groove three and is pressed against the side surface of the vertical rod (17); a spring one (31) is provided between the rear end surface of the upper T-shaped plate (28) and the rear side surface of the installation groove; one end of the spring one (31) is fixed to the upper T-shaped plate (28), and the other end of the spring one (31) is fixed to the rear side surface of the installation groove; A lower T-shaped groove is arranged on the lower side of the installation groove, a matching lower T-shaped plate (35) is slidably arranged in the lower T-shaped groove, a lower rack (34) meshing with the gear (30) is arranged on the lower T-shaped plate (35), a slide groove four penetrating the T-shaped slider one (32) and connected to the T-shaped slide groove one (6) is arranged on the rear side surface of the installation groove, an auxiliary rod (33) is arranged on the rear end surface of the lower T-shaped plate (35), and a rear clamping portion matching with the inner side surface of the T-shaped slide groove one (6) is arranged after the free end surface of the auxiliary rod (33) slides through the slide groove four, a spring two (36) is arranged between the front end surface of the lower T-shaped plate (35) and the front side surface of the installation groove, one end of the spring two (36) is fixed on the lower T-shaped plate (35), and the other end of the spring two (36) is fixed on the front side surface of the installation groove; The front pressing part and the rear pressing part both comprise a pressing plate (38), and a rubber block with a rough surface is arranged on the pressing plate (38); One end of the rotating shaft is extended to the outside of the extension block (20) and is provided with a handle (18), and the two handles (18) are arranged on the outer sides of the two extension blocks (20) facing each other.

5. The vehicle exhaust emission detection device according to claim 4, characterized in that: The front pressing part and the rear pressing part both comprise a fixing plate (37), the pressing plate (38) being arranged in the middle of the front side surface of the fixing plate (37), and a plurality of vacuum suction cups (41) being arranged on the fixing plate (37) on both sides of the pressing plate (38).

6. The vehicle exhaust emission detection device according to claim 5, characterized in that: The sides of the two fixed plates (37) are each provided with a slide groove five, the middle parts of the plurality of vacuum suction cups (41) are each provided with an air vent which penetrates into the slide groove five, the two slide grooves five are each provided with a matching blocking block (25) which is slidably disposed, the inner side surface of the extension block (20) is provided with a pair of slide grooves six (26) and seven (40) which respectively cooperate with the front clamping part and the rear clamping part and respectively penetrate into the corresponding slide grooves three and four, the outer ends of the blocking blocks (25) on both sides are respectively provided with a rod one (42) and a rod two (43) after respectively passing through the slide groove six (26) and the slide groove seven (40), The rod one (42) and the rod two (43) are slidably connected, an extension plate (24) is provided on one side of the rod one (42), a T-shaped slide groove two is provided on the corresponding side of the extension block (20), a matching T-shaped slider two (21) is slidably provided in the T-shaped slide groove two, a pair of telescopic rods one (22) is provided between the T-shaped slider two (21) and the extension plate (24), a spring three (23) is provided between the pair of telescopic rods one (22), one end of the spring three (23) is fixed on the T-shaped slider two (21), and the other end of the spring three (23) is fixed on the extension plate (24).

7. The vehicle exhaust emission detection device according to claim 6, characterized in that: A push rod (19) is arranged on the extension plate (24).

8. The vehicle exhaust emission detection device according to claim 1, characterized in that: The trolley (1) is provided with a pair of telescopic rods (11), the mixing box (3) is provided on the pair of telescopic rods (11), an electric telescopic rod (12) is provided between the pair of telescopic rods (11), the lower end of the electric telescopic rod (12) is fixed on the trolley (1), and the upper end of the electric telescopic rod (12) is fixed on the mixing box (3).

9. The vehicle exhaust emission detection device according to claim 1, characterized in that: The front end of the round tube (9) is provided with a rubber tube joint (10) with a reduced diameter and matched with the tail tube.

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