New energy automobile silencer verification tool

Abstract

The invention discloses a new energy automobile silencer verification tool, and relates to the technical field of new energy automobiles, the new energy automobile silencer verification tool comprises a comprehensive detection tool, the comprehensive detection tool comprises a sliding sleeve, an L-shaped lock groove, a handle, a location degree detection plug, a pump cavity, a piston rod, a spring, a horizontal air outlet, a vertical air inlet, a cross and a one-way valve, an L-shaped locking groove is formed in the side wall of the sliding sleeve, a handle is fixed to the side end of the tail of the sliding sleeve, a position degree detection plug is embedded in the head of the sliding sleeve, a pump cavity is formed in the sliding sleeve in the axial direction, and a piston rod is slidably installed at the tail end of the pump cavity and elastically connected with a boss on the inner wall of the pump cavity through a spring. In the using process, through arrangement of the comprehensive detection jig, the position degree and the air tightness of the silencer body can be detected only by pushing the sliding sleeve body front and back and pressing the piston rod in a reciprocating mode, the functionality of the comprehensive detection jig is greatly enriched, and the detection efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, specifically to a calibration fixture for new energy vehicle mufflers. Background Technology

[0002] The muffler is a crucial component of the exhaust system in new energy vehicles, used to reduce noise generated during exhaust. A muffler typically consists of a shell, an inner cavity, multiple layers of sound-absorbing holes, and flange connections at both ends to the exhaust tailpipe. These components are formed by welding. The exhaust system of a new energy vehicle is composed of multiple exhaust pipes, a catalytic converter, and the muffler. The successful and precise installation of the muffler with other components is closely related to the quality of its welding. Furthermore, because the muffler is a thin-walled structural component, it is susceptible to deformation under stress after welding. Therefore, precise positional testing of the muffler's connection ends is necessary to ensure assembly compatibility. In addition, new energy vehicle mufflers exhibit various failure modes, with leakage caused by poor welding being the most typical. Therefore, an airtightness check must be performed after the muffler is manufactured to eliminate potential leaks.

[0003] Therefore, exhaust mufflers for new energy vehicles must undergo airtightness and positional accuracy tests before leaving the factory to ensure the structural consistency and reliability of each product. However, existing airtightness and positional accuracy testing equipment for new energy vehicle mufflers is mostly separate, requiring inspectors to complete both tests using two independent sets of equipment. This not only significantly reduces inspection efficiency but also increases manual transportation and operating costs. Furthermore, during airtightness testing, existing equipment struggles to quickly locate leaks in mufflers with leakage issues, greatly hindering subsequent welding and repair work and impacting production efficiency.

[0004] Therefore, in view of this, we have studied and improved the existing separate-setup testing equipment to address its structural shortcomings. We propose a new energy vehicle muffler calibration fixture to integrate the testing process, optimize the testing effect, and adapt to the mass production testing needs of new energy vehicle mufflers. Summary of the Invention

[0005] The purpose of this invention is to provide a calibration fixture for mufflers of new energy vehicles to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a calibration fixture for a new energy vehicle muffler, comprising a comprehensive testing fixture, the comprehensive testing fixture comprising a sliding sleeve, an L-shaped locking groove, a handle, a position detection plug, a pump chamber, a piston rod, a spring, a horizontal air outlet, a vertical air inlet, a cross, and a one-way valve. The sliding sleeve has an L-shaped locking groove on its side wall, and a handle is fixed to the side end of the tail of the sliding sleeve. The position detection plug is nested in the head of the sliding sleeve, and a pump chamber is formed axially inside the sliding sleeve. A piston rod is slidably mounted at the tail end of the pump chamber, and the piston rod is elastically connected to a boss on the inner wall of the pump chamber through a spring. A horizontal air outlet is formed at the head of the pump chamber, and a vertical air inlet is formed on the side of the tail end of the pump chamber. A cross is fixed inside the openings of the horizontal air outlet and the vertical air inlet, and a one-way valve is connected to the intersection of the crosses through a core rod.

[0007] Furthermore, the sliding sleeve is slidably installed in the top groove of the right end plate, and a limit rod is fixed to the top side wall of the right end plate. The limit rod prevents the outer opening of the vertical air inlet from being blocked by limiting the push-in stroke of the handle.

[0008] Furthermore, a guide screw is threaded to the top of the right end plate, and the guide screw extends into the sliding groove at the top of the right end plate and is guided and engaged with the sliding sleeve through an L-shaped locking groove.

[0009] Furthermore, the root of the right end plate is fixed to the top right end of the workbench, and the top left end plate is fixed to the top left end of the workbench.

[0010] Furthermore, an airtightness detection plug is fixed to the top side wall of the left end plate, and a barometer is connected to the tail end of the internal passage of the airtightness detection plug.

[0011] Furthermore, a front support seat is fixed to the front left side of the workbench, and rollers are rotatably installed on both sides and the bottom of the top recess of the front support seat. The rollers at both ends of the top recess of the front support seat are coaxially driven by a transmission rod.

[0012] Furthermore, a synchronous belt is fitted around the roller at one end of the top notch of the front support seat, and the input end of the synchronous belt is connected to the pulley drive, and a worm gear is coaxially connected to the side end of the pulley.

[0013] Furthermore, a rear support is fixed to the rear right side of the workbench, and the rear support and the front support support respectively support the tail pipe end and the outer shell of the muffler body, and the arc-shaped support surface of the top recess of the rear support and the front support is coaxial with the axis of the muffler body.

[0014] Furthermore, a synchronous drive assembly is fixed to the side of the workbench. The synchronous drive assembly includes a pump body, an inlet pipe, a soap solution tank, an outlet pipe, a sponge brush, and a crossbeam. The pump body is bolted to the side of the workbench, and one end of the pump body is connected to the inlet pipe, with the inlet end connected to the soap solution tank. The other end of the pump body is connected to the outlet pipe, with the outlet end connected to the sponge brush. The sponge brush is located above the silencer body and fixed to the middle of the crossbeam. The two ends of the crossbeam are fixed to the left end plate and the right end plate, respectively.

[0015] Furthermore, the synchronous drive assembly also includes an upper gear, a handwheel, a lower gear, and a worm gear. The upper gear is rotatably mounted on the upper part of the pump body, and the handwheel is coaxially connected to the front of the upper gear. The lower gear is rotatably mounted on the lower part of the pump body, and the lower gear meshes with the upper gear for rotational transmission. The worm gear is coaxially connected to the back of the lower gear, and the worm gear drives the pulley to rotate synchronously through the engagement with the external teeth of the worm wheel. Sealed bearings are provided at the connection points between the worm gear, the handwheel, and the pump body.

[0016] This invention provides a calibration fixture for mufflers of new energy vehicles, which has the following beneficial effects; 1. In the process of using this invention, the integrated testing fixture allows for the detection of the position and airtightness of the muffler body by simply operating in two ways: pushing the sliding sleeve body forward and backward and pressing the piston rod back and forth. This greatly enriches the functionality of the integrated testing fixture and improves the testing efficiency. 2. In the use of this invention, by setting up a synchronous drive component, only the operation of the handwheel can be used to rotate the muffler body while simultaneously pumping soap solution. This allows the muffler body to fully contact the soap-soaked sponge brush during rotation, thereby locating and identifying the leakage point of the muffler body through the bubbling of the soap solution, which facilitates the user to further repair the leakage point by welding. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention; Figure 2 This is a schematic diagram of the workbench structure of the present invention; Figure 3 This is a schematic diagram of the front support structure of the present invention; Figure 4 This is a schematic diagram of the synchronous drive component structure of the present invention; Figure 5 This is a schematic cross-sectional view of the pump body of the present invention; Figure 6 This is a schematic diagram of the external structure of the comprehensive testing fixture of the present invention; Figure 7 This is a schematic diagram of the internal structure of the comprehensive testing fixture of the present invention.

[0018] In the diagram: 1. Comprehensive testing fixture; 101. Sliding sleeve; 102. L-shaped locking groove; 103. Handle; 104. Position detection plug; 105. Pump chamber; 106. Piston rod; 107. Spring; 108. Horizontal air outlet; 109. Vertical air inlet; 110. Cross; 111. One-way valve; 2. Right end plate; 3. Limiting rod; 4. Guide screw; 5. Worktable; 6. Left end plate; 7. Air tightness detection plug; 8. Barometer; 9. Front support seat; 10. Idler roller; 11. Drive rod; 12. Synchronous belt; 13. Pulley; 14. Worm gear; 15. Rear support seat; 16. Silencer body; 17. Synchronous drive assembly; 1701. Pump body; 1702. Inlet pipe; 1703. Soap solution tank; 1704. Outlet pipe; 1705. Sponge brush; 1706. Crossbeam; 1707. Upper gear; 1708. Handwheel; 1709. Lower gear; 1710. Worm gear. Detailed Implementation

[0019] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention. Please see Figures 1 to 7 This invention provides a technical solution: a calibration fixture for a new energy vehicle muffler, comprising a comprehensive testing fixture 1. The comprehensive testing fixture 1 includes a sliding sleeve 101, an L-shaped locking groove 102, a handle 103, a position detection plug 104, a pump chamber 105, a piston rod 106, a spring 107, a horizontal air outlet 108, a vertical air inlet 109, a cross 110, and a one-way valve 111. The sliding sleeve 101 has an L-shaped locking groove 102 on its side wall, and a handle 103 is fixed to the rear side of the sliding sleeve 101. The position detection plug 104 is nested at the head of the sliding sleeve 101, and a pump chamber 105 is axially formed inside the sliding sleeve 101. A piston rod 106 is slidably mounted at the rear end of the pump chamber 105, and the piston rod 106 is connected to the pump chamber by a spring 107. The inner wall of the cavity 105 is elastically connected by a boss. The first end of the pump cavity 105 is provided with a horizontal air outlet 108, and the side of the rear end of the pump cavity 105 is provided with a vertical air inlet 109. A cross 110 is fixed inside the openings of the horizontal air outlet 108 and the vertical air inlet 109. A one-way valve 111 is connected to the intersection of the cross 110 in the middle through a core rod. The sliding sleeve 101 is slidably installed in the top groove of the right end plate 2. A limit rod 3 is fixed to the top side wall of the right end plate 2. The limit rod 3 prevents the outer opening of the vertical air inlet 109 from being blocked by limiting the push stroke of the handle 103. A guide screw 4 is threadedly connected to the top of the right end plate 2. The guide screw 4 is inserted into the top groove of the right end plate 2 and is guided and engaged with the sliding sleeve 101 through the L-shaped locking groove 102. The specific operation is as follows: First, the outer shell and tailpipe end of the muffler body 16 to be tested are respectively placed in the arc-shaped support surfaces of the top recesses of the front support seat 9 and the rear support seat 15. Then, the flange connection end of the muffler body 16 is inserted into the airtightness test plug 7 on the side of the left end plate 6 to seal the center hole on one side of the muffler body 16. When performing positional accuracy testing, the user holds the handle 103 at the tail of the sliding sleeve 101. With the cooperation of the guide screw 4 at the top of the right end plate 2 and the L-shaped locking groove 102 on the side wall of the sliding sleeve 101, the sliding sleeve 101 is moved forward. The position detection plug 104 is pushed towards the tailpipe end of the muffler body 16. Since the arc-shaped support surfaces of the top recesses of the rear support seat 15 and the front support seat 9 in this application are coaxial with the axis of the muffler body 16, the position can be determined by whether the position detection plug 104 can smoothly enter the central hole at the tailpipe end of the muffler body 16. Furthermore, the user can fix the position of the position detection plug 104 by rotating the handle 103 along the L-shaped locking groove 102 to achieve muffler silencing. The sealing of the central hole on the other side of the main body 16 prepares for subsequent airtightness testing. During the airtightness test, the user presses the piston rod 106 repeatedly, allowing outside air to enter the pump chamber 105 inside the sliding sleeve 101 through the vertical air inlet 109, and then enter the muffler body 16 through the horizontal air outlet 108 at the head of the pump chamber 105. This application uses a cross 110 to install a one-way valve 111 that can elastically deform on the inside of the openings of the horizontal air outlet 108 and the vertical air inlet 109 to control the one-way flow. The function of air intake and exhaust is that, since the central holes at both ends of the muffler body 16 have been sealed in the previous position detection process, the presence of leakage in the muffler body 16 under test can be determined by observing the change in the reading of the barometer 8. With the setting of the integrated testing fixture 1, this application only requires two operations: pushing the sliding sleeve 101 body forward and backward and pressing the piston rod 106 back and forth. The position and air tightness of the muffler body 16 can be tested respectively, which greatly enriches the functionality of the integrated testing fixture 1 and improves the testing efficiency. Please see Figures 1 to 5The right end plate 2 is fixed to the top right end of the workbench 5, and a left end plate 6 is fixed to the top left end of the workbench 5. An airtightness test plug 7 is fixed to the top side wall of the left end plate 6, and a pressure gauge 8 is connected to the tail end of the internal passage of the airtightness test plug 7. A front support seat 9 is fixed to the front left side of the workbench 5, and rollers 10 are rotatably installed on both sides and the bottom of the top recess of the front support seat 9. The rollers 10 at both ends of the top recess of the front support seat 9 are coaxially driven by a transmission rod 11. A synchronous belt 12 is fitted on the outside of the roller 10 at one end of the top recess of the front support seat 9, and the input end of the synchronous belt 12 is connected to... The pulley 13 is connected for transmission, and a worm gear 14 is coaxially connected to the side end of the pulley 13. A rear support seat 15 is fixed to the rear right side of the workbench 5. The rear support seat 15 and the front support seat 9 respectively support the tail pipe end and the outer shell of the muffler body 16. The arc-shaped support surface of the top notch of the rear support seat 15 and the front support seat 9 is coaxial with the axis of the muffler body 16. A synchronous drive assembly 17 is fixed to the side end of the workbench 5. The synchronous drive assembly 17 includes a pump body 1701, a water inlet pipe 1702, a soap solution tank 1703, a water outlet pipe 1704, a sponge brush 1705, and a crossbeam 1706. Pump body 1701 is bolted to the side of workbench 5. One end of pump body 1701 is connected to water inlet pipe 1702, and the input end of water inlet pipe 1702 is connected to soap solution tank 1703. The other end of pump body 1701 is connected to water outlet pipe 1704, and the output end of water outlet pipe 1704 is connected to sponge brush 1705. Sponge brush 1705 is located above silencer body 16 and fixed to the middle of crossbeam 1706. The two ends of crossbeam 1706 are fixed to left end plate 6 and right end plate 2 respectively. Synchronous drive assembly 17 also includes upper gear 1707, handwheel 1708, and lower gear. The pump body 1701 has a wheel 1709 and a worm gear 1710. An upper gear 1707 is rotatably mounted inside the upper part of the pump body 1701, and a handwheel 1708 is coaxially connected to the front of the upper gear 1707. A lower gear 1709 is rotatably mounted inside the lower part of the pump body 1701, and the lower gear 1709 meshes with the upper gear 1707 for rotational transmission. A worm gear 1710 is coaxially connected to the back of the lower gear 1709, and the worm gear 1710 rotates synchronously to the pulley 13 through the engagement with the external teeth of the worm wheel 14. Sealed bearings are provided at the connection points between the worm gear 1710, the handwheel 1708 and the pump body 1701. The specific operation is as follows: When a leak is found in the muffler body 16 under test during the airtightness test, the user cranks the upper gear 1707 using the handwheel 1708. The meshing of the outer teeth of the upper gear 1707 and lower gear 1709 drives the lower gear 1709 to rotate synchronously. During use, on one hand, the water inlet pipe 1702 at one end of the pump body 1701 draws soap solution from the soap solution pool 1703, and through the gear meshing space within the pump body 1701... The volume change is used to transport the soap solution, allowing it to enter the sponge brush 1705 above the muffler body 16 from the outlet pipe 1704 at the other end of the pump body 1701. Meanwhile, when the lower gear 1709 is meshed with the upper gear 1707, it also synchronously drives the worm gear 1710 on the back to rotate coaxially. Furthermore, the worm gear 1710, through its engagement with the external teeth of the worm wheel 14, synchronously drives the pulley 13 to rotate, causing the pulley 13 to rotate synchronously through the externally fitted synchronous belt 12. The rollers 10 on both sides of the top notch and the bottom of the front support 9 rotate, thereby driving the muffler body 16 placed on it to rotate. During the rotation, the outer shell of the muffler body 16 makes full contact with the sponge brush 1705 soaked in soap solution, so that the outer shell of the muffler body 16 is evenly coated with soap solution. Afterwards, the user only needs to repeat the above airtightness test steps to further identify and locate the leakage point of the outer shell of the muffler body 16 by the bubbles at the soap solution application point, which makes it convenient for the user to further repair the leakage point by welding. With the setting of the synchronous drive component 17, this application only needs to operate the handwheel 1708 to rotate, so that the muffler body 16 can rotate while the soap solution is continuously pumped, so that the muffler body 16 makes full contact with the sponge brush 1705 soaked in soap solution during the rotation, and then locates and identifies the leakage point of the muffler body 16 by the bubbles of soap solution, which makes it convenient for the user to further repair the leakage point by welding.

[0020] In summary, when using this new energy vehicle muffler calibration fixture, firstly, the outer shell and tailpipe end of the muffler body 16 to be tested are respectively placed in the arc-shaped support surfaces of the top recesses of the front support seat 9 and the rear support seat 15. Then, the flange connection end of the muffler body 16 is inserted into the airtightness test plug 7 on the side of the left end plate 6 to seal the center hole on one side of the muffler body 16. When performing positional accuracy testing, the user holds the handle 103 at the tail of the sliding sleeve 101. With the cooperation of the guide screw 4 at the top of the right end plate 2 and the L-shaped locking groove 102 on the side wall of the sliding sleeve 101, the positional accuracy test plug 104 at the head of the sliding sleeve 101 is pushed towards the tailpipe end of the muffler body 16. Because the arc-shaped support surfaces of the top recesses of the rear support seat 15 and the front support seat 9 in this application are aligned with the muffler body... The axis of body 16 is coaxially designed, so the positional accuracy can be determined by whether the positional accuracy detection plug 104 can be smoothly inserted into the center hole at the tailpipe end of the muffler body 16. Furthermore, by rotating the handle 103 along the L-shaped locking groove 102, the user can fix the position of the positional accuracy detection plug 104 to seal the center hole on the other side of the muffler body 16, preparing for subsequent airtightness testing. During airtightness testing, the user presses the piston rod 106 repeatedly, allowing outside air to enter the pump chamber 105 inside the sliding sleeve 101 through the vertical air inlet 109, and then enter the muffler body 16 through the horizontal air outlet 108 at the head of the pump chamber 105. This application utilizes the horizontal air outlet 108 and the vertical air inlet... A one-way valve 111, which can be elastically deformed, is installed inside the opening 109 via a cross 110 to control the one-way air intake and exhaust. Since the central holes at both ends of the muffler body 16 were sealed during the previous positional accuracy test, the presence of a leak in the muffler body 16 can be determined by observing the change in the barometer reading 8. This application, through the setting of the integrated testing fixture 1, allows for the testing of the positional accuracy and airtightness of the muffler body 16 by simply pushing the sliding sleeve 101 back and forth and pressing the piston rod 106. This greatly enriches the functionality of the integrated testing fixture 1 and improves testing efficiency. When a leak is found in the muffler body 16 during the airtightness test, the user can... The handwheel 1708 cranks the upper gear 1707, and the meshing action of the outer teeth of the upper gear 1707 and the lower gear 1709 drives the lower gear 1709 to rotate synchronously. During use, on the one hand, the water inlet pipe 1702 at one end of the pump body 1701 draws soap solution from the soap solution pool 1703, and delivers the soap solution through the volume change of the gear meshing space inside the pump body 1701, so that the soap solution enters the sponge brush 1705 above the muffler body 16 from the water outlet pipe 1704 at the other end of the pump body 1701. On the other hand, when the lower gear 1709 is meshed and driven by the upper gear 1707, it also synchronously drives the back worm gear 1710 to rotate coaxially. Furthermore, the worm gear 1710 drives the pulley 13 to rotate synchronously through the engagement with the outer teeth of the worm wheel 14.The pulley 13 rotates via the externally mounted synchronous belt 12, which in turn rotates the rollers 10 on both sides of the top recess and at the bottom of the front support seat 9. These rollers, in turn, drive the muffler body 16, which is placed on top of the belt, to rotate. During this rotation, the outer shell of the muffler body 16 comes into full contact with the soap-soaked sponge brush 1705, ensuring that the soap solution is evenly applied to the outer shell. The user can then repeat the airtightness test steps to identify and locate any leaks in the outer shell of the muffler body 16 by observing the bubbles formed at the soap-soaked areas. This allows for further welding repairs. Through the synchronous drive assembly 17, simply rotating the handwheel 1708 enables continuous pumping of soap solution while the muffler body 16 rotates. This ensures that the muffler body 16 comes into full contact with the soap-soaked sponge brush 1705 during rotation, allowing for the identification and repair of leaks through the bubbling of the soap solution.

[0021] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A calibration fixture for a new energy vehicle muffler, comprising a comprehensive testing fixture (1), characterized in that, The integrated testing fixture (1) includes a sliding sleeve (101), an L-shaped locking groove (102), a handle (103), a position detection plug (104), a pump chamber (105), a piston rod (106), a spring (107), a horizontal air outlet (108), a vertical air inlet (109), a cross (110), and a one-way valve (111). The sliding sleeve (101) has an L-shaped locking groove (102) on its side wall, and a handle (103) is fixed to the tail end of the sliding sleeve (101). The position detection plug (104) is nested in the head of the sliding sleeve (105), and the sliding sleeve (106) has a handle (103) on its tail end. 1) An axial pump chamber (105) is provided inside. A piston rod (106) is slidably installed at the tail end of the pump chamber (105). The piston rod (106) is elastically connected to the inner wall boss of the pump chamber (105) through a spring (107). A horizontal air outlet (108) is provided at the head end of the pump chamber (105). A vertical air inlet (109) is provided on the side of the tail end of the pump chamber (105). A cross (110) is fixed inside the opening of the horizontal air outlet (108) and the vertical air inlet (109). A one-way valve (111) is connected to the intersection of the cross (110) in the middle through a core rod.

2. The new energy vehicle muffler calibration fixture according to claim 1, characterized in that, The sliding sleeve (101) is slidably installed in the top groove of the right end plate (2), and a limit rod (3) is fixed on the top side wall of the right end plate (2). The limit rod (3) prevents the outer opening of the vertical air inlet (109) from being blocked by limiting the push stroke of the handle (103).

3. The new energy vehicle muffler calibration fixture according to claim 2, characterized in that, The top of the right end plate (2) is threaded with a guide screw (4), and the guide screw (4) extends into the top groove of the right end plate (2) and is guided and engaged with the sliding sleeve (101) through the L-shaped locking groove (102).

4. The new energy vehicle muffler calibration fixture according to claim 2, characterized in that, The root of the right end plate (2) is fixed to the top right end of the workbench (5), and the top left end plate (6) is fixed to the top left end of the workbench (5).

5. The new energy vehicle muffler calibration fixture according to claim 4, characterized in that, The top side wall of the left end plate (6) is fixed with an airtightness detection plug (7), and the tail end of the internal passage of the airtightness detection plug (7) is connected to a barometer (8).

6. The new energy vehicle muffler calibration fixture according to claim 4, characterized in that, The front end of the left side of the workbench (5) is fixed with a front support seat (9), and rollers (10) are rotatably installed on both sides and the bottom of the top recess of the front support seat (9), and the rollers (10) at both ends of the top recess of the front support seat (9) are coaxially driven by a transmission rod (11).

7. The new energy vehicle muffler calibration fixture according to claim 6, characterized in that, The roller (10) at one end of the top notch of the front support (9) is fitted with a synchronous belt (12), and the input end of the synchronous belt (12) is connected to the pulley (13) for transmission. The pulley (13) is coaxially connected to the side end of the pulley (13) with a worm gear (14).

8. The new energy vehicle muffler calibration fixture according to claim 4, characterized in that, The workbench (5) has a rear support seat (15) fixed at the right rear end. The rear support seat (15) and the front support seat (9) support the tail pipe end and the outer shell of the muffler body (16) respectively. The arc-shaped support surface of the top notch of the rear support seat (15) and the front support seat (9) is coaxial with the axis of the muffler body (16).

9. The new energy vehicle muffler calibration fixture according to claim 4, characterized in that, A synchronous drive assembly (17) is fixed to the side of the workbench (5). The synchronous drive assembly (17) includes a pump body (1701), a water inlet pipe (1702), a soap solution tank (1703), a water outlet pipe (1704), a sponge brush (1705), and a crossbeam (1706). The pump body (1701) is bolted to the side of the workbench (5), and one end of the pump body (1701) is connected to the water inlet pipe (1702), and water enters the tank. The input end of the pipe (1702) is connected to the soap solution tank (1703), and the other end of the pump body (1701) is connected to the water outlet pipe (1704). The output end of the water outlet pipe (1704) is connected to the sponge brush (1705). The sponge brush (1705) is located above the silencer body (16) and fixed in the middle of the crossbeam (1706). The two ends of the crossbeam (1706) are fixed to the left end plate (6) and the right end plate (2) respectively.

10. A new energy vehicle muffler calibration fixture according to claim 9, characterized in that, The synchronous drive assembly (17) further includes an upper gear (1707), a handwheel (1708), a lower gear (1709), and a worm (1710). The upper gear (1707) is rotatably mounted on the upper part of the pump body (1701), and the handwheel (1708) is coaxially connected to the front of the upper gear (1707). The lower gear (1709) is rotatably mounted on the lower part of the pump body (1701), and the lower gear (1709) meshes with the upper gear (1707) for rotational transmission. The worm (1710) is coaxially connected to the back of the lower gear (1709), and the worm (1710) rotates synchronously to the pulley (13) through the engagement with the external tooth profile of the worm wheel (14). Sealed bearings are provided at the connection points between the worm (1710) and the handwheel (1708) and the pump body (1701).

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