A clamp for sampling exhaust gases from automobile exhaust pipes

Abstract

This utility model belongs to the field of automotive exhaust gas sampling technology, and particularly relates to a clamp for sampling exhaust gas from automotive exhaust pipes, including a main rod, a sampling tube, and a clamping assembly. The clamping assembly includes a chuck and an elastic element for providing clamping force. One end of the elastic element is connected to the chuck to drive it to move towards the sampling tube, and the other end is provided with an adjustment assembly for adjusting the elastic element. An extension tube is provided on one side of the main rod, and the extension tube is connected to the sampling tube. The preload of the elastic element can be flexibly adjusted by the adjustment assembly. Combined with the drive handle, it can quickly open and close the chuck, and accurately adjust the clamping force according to the diameter of the exhaust pipe, making it suitable for exhaust pipes of different models and diameters, with a wider range of applications. At the same time, the full-process constraint channel formed by the extension tube and the sampling tube effectively restricts the movement of the detection tube when it passes through the extension tube, preventing it from loosening at the connection with the probe, and ensuring the continuity and accuracy of the detection process.

Description

Technical Field

[0001] This utility model relates to the field of automotive exhaust gas sampling technology, specifically to a clamp for sampling exhaust gas from automotive exhaust pipes. Background Technology

[0002] In the process of testing vehicle exhaust emissions, a special fixture is used to insert and fix the test probe into the vehicle's exhaust pipe to ensure stable installation of the test probe and the test pipe, thereby ensuring accurate collection of exhaust emission data.

[0003] However, existing exhaust gas sampling fixtures generally suffer from the following technical defects: the clamping force of existing fixtures is mostly fixed and cannot be flexibly adjusted according to the diameter of the exhaust pipe. Insufficient clamping force can easily cause the fixture to fall off, or excessive clamping force can damage the exhaust pipe, seriously affecting the detection efficiency and accuracy, and thus causing deviations in the detection data; existing sampling tubes only serve to insert and fix the detection probe, and do not constrain the detection tube connected to the detection probe. During detection, the detection tube is prone to shaking and displacement, causing the connection between it and the detection probe to loosen or causing the detection probe to move, thus causing deviations in the detection data.

[0004] In view of the shortcomings of the existing technology, there is an urgent need to design a more effective exhaust gas sampling fixture that can clamp the fixture and the vehicle's exhaust pipe with adjustable clamping force and constrain the detection pipe, so as to meet the actual needs of vehicle exhaust gas detection. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an exhaust gas sampling fixture that can more effectively clamp the clamp and the exhaust pipe of the car, and whose clamping force is adjustable and can constrain the detection pipe.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A clamp for sampling exhaust gas from a car exhaust pipe includes a main rod, a sampling tube, and a clamping assembly. The sampling tube is disposed at one end of the main rod, a main handle is disposed at the other end of the main rod, and the clamping assembly is disposed below the sampling tube.

[0008] The clamping assembly includes a clamp and an elastic element for providing clamping force. One end of the elastic element is connected to the clamp and drives it to move toward the sampling tube. The other end of the elastic element is provided with an adjustment assembly for adjusting the elastic element.

[0009] A drive grip is rotatably provided on one side of the main grip. The drive grip is provided with a drive rod connected to the chuck. The drive grip drives the drive rod to move the chuck downward.

[0010] An extension tube is provided on one side of the main rod, and the extension tube is connected to the sampling tube.

[0011] Furthermore, the end of the clamp facing the sampling tube is provided with serrations, which are distributed along the length of the clamp.

[0012] Furthermore, the clamp is U-shaped, with its opening facing upward toward the sampling tube and having a positioning groove, and the serrations are symmetrically arranged on both sides of the positioning groove.

[0013] Furthermore, an arc-shaped positioning pad is detachably provided in the positioning groove, and the upper end surface of the arc-shaped positioning pad is provided with an arc-shaped surface that matches the curvature of the outer wall of the automobile exhaust pipe.

[0014] Furthermore, the two ends of the drive rod are hinged to the clamp and the drive grip, respectively.

[0015] Furthermore, the adjustment assembly includes a support base, a connector, and an adjustment screw. The support base is connected to the connector. The main rod has several adjustment threaded holes. The connector is connected and fixed to the main rod by the adjustment screw cooperating with the adjustment threaded holes. The support base has a mounting hole. The drive rod passes through the mounting hole and is connected to the clamp. The elastic element is a spring, which is fitted on the drive rod and abuts against both the clamp and the support base.

[0016] Furthermore, the extension tube includes a fixed half-tube and a movable half-tube. One end of the fixed half-tube is connected and fixed to the sampling tube, and one side of the movable half-tube is hinged to the fixed half-tube through a hinge structure, so that the movable half-tube can rotate relative to the fixed half-tube through the hinge structure to achieve opening and closing.

[0017] Furthermore, a locking element is provided between the fixed half tube and the movable half tube. The locking element is a magnetic element, which is respectively disposed between the fixed half tube and the movable half tube. When closed, the two are fixed by magnetic attraction through the magnetic force of the magnetic element.

[0018] Furthermore, the sampling tube includes a first sampling tube and a second sampling tube, with the second sampling tube positioned above the first sampling tube; a locking screw is provided on one side of both the first and second sampling tubes.

[0019] Furthermore, both the main grip and the drive grip are equipped with protective sponge.

[0020] Compared with existing technologies, the advantages of this invention are that the preload of the elastic element can be flexibly adjusted through the adjustment component, and in conjunction with the drive handle, it can quickly open and close the clamp, and precisely adjust the clamping force according to the diameter of the exhaust pipe. This solves the problem of the fixed and unadjustable clamping force of existing clamps, and can be adapted to exhaust pipes of different models and diameters, thus having a wider range of applications. At the same time, the full-process constraint channel formed by the extension tube and the sampling tube effectively restricts the shaking of the detection tube when it is placed inside the extension tube, preventing it from loosening at the connection with the probe, and ensuring the continuity and accuracy of the detection process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of another embodiment of the extension tube in this utility model;

[0023] In the diagram, 1. Main rod, 2. Sampling tube, 3. Main handle, 4. Clamp, 5. Elastic element, 6. Drive handle, 7. Drive pull rod, 8. Extension tube, 9. Serrated edge, 10. Positioning groove, 11. Arc-shaped positioning pad, 12. Support base, 13. Connector, 14. Adjusting threaded hole, 15. Fixed half tube, 16. Movable half tube, 17. First sampling tube, 18. Second sampling tube, 19. Locking screw. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] It should be noted that when a component / part is referred to as being "set on" another component / part, it can be directly set on the other component / part or there may be an intervening component / part. When a component / part is referred to as being "connected / linked" to another component / part, it can be directly connected / linked to the other component / part or there may be an intervening component / part. The term "connected / linked" as used herein can include electrical and / or mechanical physical connections / links. The term "including / comprises" as used herein means the presence of a feature, step, or component / part, but does not exclude the presence or addition of one or more other features, steps, or components / parts. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. Specific Implementation Example 1:

[0027] Please see Figure 1 The image shows a clamp for sampling exhaust gases from a car exhaust pipe. Figure 1To facilitate observation of the connections between structures (shown through perspective hidden lines), the fixture includes a main rod 1, a sampling tube 2, and a clamping assembly. The main rod 1 serves as the supporting frame for the overall fixture. The sampling tube 2 is located at one end of the main rod 1, and a main handle 3 is located at the other end. The clamping assembly is positioned below the sampling tube 2. The clamping assembly includes a chuck 4 and an elastic element 5 for providing clamping force. One end of the elastic element 5 is connected to the chuck 4, driving it to move towards the sampling tube 2. The other end of the elastic element 5 is equipped with an adjustment component for adjusting the elastic element 5. A drive handle 6 is rotatably connected to one side of the main handle 3 via a pin. The drive grip 6 is equipped with a drive rod 7 connected to the clamp 4. The drive grip 6 drives the drive rod 7 to move the clamp 4 downward. The drive grip 6 and the main grip 3 cooperate to form a "scissor-type" operating structure, which makes it easy for the operator to control the opening and closing of the clamp 4 with one hand. When the operator presses the drive grip 6, the drive grip 6 rotates around the hinge point with the main grip 3, which drives the drive rod 7 to pull the clamp 4 downward, so that the clamp 4 moves downward against the elastic force of the elastic element 5, such as a spring. After the drive grip 6 is released, the spring pushes the clamp 4 upward according to its own elastic force, which, together with the sampling tube 2, achieves the clamping and fixing of the exhaust pipe.

[0028] An extension tube 8 is provided on one side of the main rod 1, and the extension tube 8 is connected to the sampling tube 2. The sampling tube 2 is fixedly installed at the end of the main rod 1 near the exhaust pipe and is used to insert and constrain the detection probe. The extension tube 8 is used to insert and constrain the detection tube connected to the detection probe.

[0029] The clamp 4 has serrations 9 at one end facing the sampling tube 2, and the serrations 9 are distributed along the length of the clamp 4. The clamp 4 is U-shaped, with its opening facing upward toward the sampling tube 2 and has a positioning groove 10. The positioning groove 10 is used to cooperate with the car exhaust pipe to prevent the exhaust pipe from shifting laterally. The serrations 9 are symmetrically arranged on both sides of the positioning groove 10, which can increase the friction between the clamp 4 and the outer wall of the exhaust pipe and prevent the exhaust pipe from sliding relative to the clamp 4 during the sampling process.

[0030] An arc-shaped positioning pad 11 is detachably provided in the positioning groove 10. The upper surface of the arc-shaped positioning pad 11 is provided with an arc-shaped surface that matches the curvature of the outer wall of the automobile exhaust pipe. By providing the arc-shaped positioning pad 11, the positioning stability of the exhaust pipe can be further improved, and the outer wall scratches caused by the chuck 4 directly contacting the exhaust pipe can be avoided.

[0031] The two ends of the drive rod 7 are hinged to the clamp 4 and the drive grip 6, respectively.

[0032] The adjusting component for adjusting the preload of the spring and thus the clamping strength of the chuck 4 includes a support base 12, a connector 13, and an adjusting screw. The support base 12 is connected to the connector 13. The main rod 1 has several adjusting threaded holes 14. The connector 13 has through holes that match the adjusting threaded holes 14. The adjusting screw passes through the through hole and engages with any one of the adjusting threaded holes 14, thus fixing the connector 13 to the main rod 1 and adjusting the position of the support base 12 on the main rod 1. The support base 12 has mounting holes. The drive rod 7 passes through the mounting holes and can slide up and down along the mounting holes to connect with the chuck 4. The elastic element 5 is a spring. The spring is fitted on the drive rod 7 and abuts against both the chuck 4 and the support base 12. When the support base 12 is fixed to the adjusting threaded holes 14 at different heights by the adjusting screw, the compression of the spring changes, and its preload is adjusted accordingly, thereby adapting to the clamping requirements of exhaust pipes of different diameters.

[0033] like Figure 2 As shown, the extension tube 8 includes a fixed half-tube 15 and a movable half-tube 16. One end of the fixed half-tube 15 is fixedly connected to the sampling tube 2. One side of the movable half-tube 16 is hinged to the fixed half-tube 15 via a hinge structure, allowing the movable half-tube 16 to rotate relative to the fixed half-tube 15 through the hinge structure to open and close. When open, the movable half-tube 16 separates from the fixed half-tube 15, allowing the operator to directly place the detection tube into the groove of the fixed half-tube 15. When closed, the movable half-tube 16 engages with the fixed half-tube 15, forming a complete circular channel that wraps and constrains the detection tube, thereby preventing the detection tube from shaking or shifting, and making it easier for the operator to control the detection tube.

[0034] A locking element, which is a magnetic element, is also provided between the fixed half-tube 15 and the movable half-tube 16. The magnetic element (magnet) is respectively disposed between the fixed half-tube 15 and the movable half-tube 16, and is embedded in the edges of the fixed half-tube 15 and the movable half-tube 16 (due to its embedded nature). Figure 2 It is not shown that whether the magnet is embedded or exposed does not affect their mutual attraction. When closed, the two are fixed by magnetic attraction of the magnetic components to avoid the extension tube 8 from being accidentally opened during the detection process.

[0035] The sampling tube 2 includes a first sampling tube 17 and a second sampling tube 18. The second sampling tube 18 is positioned above the first sampling tube 17 and parallel to it. By providing the first sampling tube 17 and the second sampling tube 18, the two exhaust pipes of the vehicle can be tested simultaneously, thereby achieving compliance with the exhaust gas testing standards. Both tubes have extension tubes 8 extending along the length of the main rod 1. Each of the first sampling tube 17 and the second sampling tube 18 has a locking screw 19 on one side. The locking screw 19 passes radially through the sampling tube and engages with the threaded part of the sampling tube. When the detection probe is inserted into the sampling tube, tightening the locking screw 19 will cause the end of the screw to press against the detection probe, thereby fixing the detection probe and preventing it from sliding and displacing during the sampling process, which would affect the detection.

[0036] Both the main grip 3 and the drive grip 6 are equipped with protective sponges. The outer surfaces of the main grip 3 and the drive grip 6 are covered with protective sponges. The protective sponges can increase the friction between the hand and the grip to prevent slipping, and can also cushion the grip pressure to reduce hand fatigue caused by long-term operation.

[0037] The process of using this utility model:

[0038] Detection tube installation: Open the movable half tube 16 of the extension tube 8 (overcoming the magnetic force of the magnetic suction device), place the detection tube into the groove of the fixed half tube 15, close the movable half tube 16 and fix it with the magnetic suction device; insert one end of the detection tube into the sampling tube (first sampling tube 17 or second sampling tube 18), tighten the locking screw 19 on the sampling tube to fix the detection tube, and connect the other end of the detection tube to the detection probe.

[0039] Fixture positioning and clamping: The operator holds the main handle 3 and the drive handle 6 with one hand, and presses the drive handle 6 to move the chuck 4 downward; align the sampling tube with the car exhaust pipe, and place the detection probe inside the car exhaust pipe; release the drive handle 6, and the spring pushes the chuck 4 upward, which, together with the sampling tube, clamps the exhaust pipe. The serrations 9 of the chuck 4 and the arc-shaped positioning pad 11 ensure stable positioning of the exhaust pipe.

[0040] Clamping force adjustment: If the clamping force needs to be adjusted, unscrew the adjusting screw of the adjusting component, move the connector 13 to the adjusting threaded hole 14 at the appropriate height, and tighten the adjusting screw to fix the support base 12. When the support base 12 moves upward, the spring compression increases and the clamping force is enhanced; when the support base 12 moves downward, the spring compression decreases and the clamping force is weakened, so as to adapt to exhaust pipes of different diameters.

[0041] Sampling and disassembly: After the test is completed, press the drive handle 6 to move the clamp 4 downward and disengage it from the exhaust pipe, then remove the clamp from the exhaust pipe; open the movable half-tube 16 of the extension tube 8 and the locking screw 19 of the sampling tube, take out the test tube, and complete the disassembly.

[0042] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A clamp for sampling exhaust gases from automobile exhaust pipes, characterized in that, It includes a main rod (1), a sampling tube (2) and a clamping assembly. The sampling tube (2) is located at one end of the main rod (1), and a main handle (3) is located at the other end of the main rod (1). The clamping assembly is located below the sampling tube (2). The clamping assembly includes a clamp (4) and an elastic element (5) for providing clamping force. One end of the elastic element (5) is connected to the clamp (4) to drive it to move toward the sampling tube (2), and the other end is provided with an adjustment assembly for adjusting the elastic element (5). The main grip (3) is provided with a drive grip (6) on one side. The drive grip (6) is provided with a drive rod (7) connected to the clamp (4). The drive grip (6) causes the clamp (4) to move downward by driving the drive rod (7). An extension tube (8) is provided on one side of the main rod (1), and the extension tube (8) is connected to the sampling tube (2).

2. The clamp for sampling exhaust gas from an automobile exhaust pipe according to claim 1, characterized in that, The clamp (4) has serrations (9) at one end facing the sampling tube (2), and the serrations (9) are distributed along the length direction of the clamp (4).

3. The clamp for sampling exhaust gas from an automobile exhaust pipe according to claim 2, characterized in that, The clamp (4) is U-shaped, with its opening facing upward toward the sampling tube (2) and a positioning groove (10). The serrations (9) are symmetrically arranged on both sides of the positioning groove (10).

4. The clamp for sampling exhaust gas from an automobile exhaust pipe according to claim 3, characterized in that, The positioning groove (10) is detachably provided with an arc-shaped positioning pad (11), and the upper end surface of the arc-shaped positioning pad (11) is provided with an arc-shaped surface that matches the curvature of the outer wall of the automobile exhaust pipe.

5. The clamp for sampling exhaust gas from an automobile exhaust pipe according to claim 1, characterized in that, The two ends of the drive rod (7) are hinged to the clamp (4) and the drive grip (6), respectively.

6. The clamp for sampling exhaust gas from an automobile exhaust pipe according to claim 1, characterized in that, The adjustment assembly includes a support base (12), a connector (13), and an adjustment screw. The support base (12) is connected to the connector (13). The main rod (1) is provided with a plurality of adjustment threaded holes (14). The connector (13) is connected and fixed to the main rod (1) by the adjustment screw and the adjustment threaded holes (14). The support base (12) is provided with a mounting hole. The drive rod (7) passes through the mounting hole and is connected to the clamp (4). The elastic element (5) is a spring. The spring is fitted on the drive rod (7) and abuts against both the clamp (4) and the support base (12).

7. The clamp for sampling exhaust gas from an automobile exhaust pipe according to claim 1, characterized in that, The extension tube (8) includes a fixed half tube (15) and a movable half tube (16). One end of the fixed half tube (15) is connected and fixed to the sampling tube (2). One side of the movable half tube (16) is hinged to the fixed half tube (15) through a hinge structure, so that the movable half tube (16) can rotate relative to the fixed half tube (15) through the hinge structure to achieve opening and closing.

8. The clamp for sampling exhaust gas from an automobile exhaust pipe according to claim 7, characterized in that, A locking element is provided between the fixed half tube (15) and the movable half tube (16). The locking element is a magnetic element. The magnetic element is respectively set between the fixed half tube (15) and the movable half tube (16). When closed, the two are fixed by magnetic attraction through the magnetic force of the magnetic element.

9. The clamp for sampling exhaust gas from an automobile exhaust pipe according to claim 1, characterized in that, The sampling tube (2) includes a first sampling tube (17) and a second sampling tube (18), with the second sampling tube (18) positioned above the first sampling tube (17); a locking screw (19) is provided on one side of both the first sampling tube (17) and the second sampling tube (18).

10. The clamp for sampling exhaust gas from an automobile exhaust pipe according to claim 1, characterized in that, Both the main grip (3) and the drive grip (6) are provided with protective sponge.

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