Cold and hot impact test device for automobile exhaust pipe

Abstract

The invention discloses a cold and hot impact test device for an automobile exhaust pipe, and relates to the field of cold and hot impact tests of exhaust pipes, the cold and hot impact test device comprises a base, a test box is arranged at the end part of the base, a partition plate is arranged in the test box, and the test box is divided into two test cavities by the partition plate; in the cold and hot impact test process, the first butterfly valve and the third butterfly valve serve as a group and are opened or closed at the same time, the second butterfly valve and the fourth butterfly valve serve as a group and are opened or closed at the same time, all the butterfly valves are rapidly switched, and the air inlet assembly is installed on the supporting frame and connected with the first cold and hot impact pipe and the second cold and hot impact pipe. The first cold and hot impact pipe conveys cold air and hot air into the test cavity communicated with the first cold and hot impact pipe, and the second cold and hot impact pipe conveys cold air and hot air into the test cavity communicated with the second cold and hot impact pipe, so that the cold and hot alternate impact test of the two exhaust pipes is realized, the test efficiency is improved, and the exhaust pipes can be tested in batches.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cold and hot impact test of exhaust pipe, in particular to a cold and hot impact test device for automobile exhaust pipe. BACKGROUND

[0002] Cold and hot impact test is a test method for evaluating the reliability of materials or products by rapidly alternating the environmental temperature (such as high temperature and low temperature). As a component of automobile, the cold and hot impact test of exhaust pipe is mainly used to simulate the extreme temperature changes that may be encountered in actual use, in order to verify its durability and reliability.

[0003] At present, in the test device, the exhaust pipe is subjected to rapid switching of high temperature and low temperature environment (for example, from 150℃ high temperature to-40℃ low temperature), so as to cause the alternating stress generated by thermal expansion and cold contraction of the material, so as to detect whether the exhaust pipe will appear cracking, loose parts or abnormal electrical performance and other problems.

[0004] In the cold and hot impact test of the prior art exhaust pipe, the exhaust pipe needs to be connected with the heat source and the cold source at the same time, and the cold and hot impact effect is realized by alternating opening and closing of the heat source equipment and the cold source equipment. However, the test device in the prior art can only implement cold and hot impact test on one exhaust pipe at a time, which is low in test efficiency and cannot meet the batch test demand.

[0005] Therefore, we propose a cold and hot impact test device for automobile exhaust pipe. SUMMARY

[0006] The present application aims to provide a cold and hot impact test device for automobile exhaust pipe to solve the problems raised in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a cold and hot impact test device for automobile exhaust pipe, comprising a base, the end of the base is provided with a test box, the test box is provided with a door body, and the rear side of the test box is provided with a support frame, the support frame is communicated with a first cold and hot impact pipe and a second cold and hot impact pipe; further comprising: an air inlet assembly, the air inlet assembly is installed on the support frame and connected with the first cold and hot impact pipe and the second cold and hot impact pipe, the air inlet assembly transports cold and hot source into the test box through the first cold and hot impact pipe and the second cold and hot impact pipe, and then performs cold and hot impact test on the exhaust pipe in the test box; an air outlet assembly, the air outlet assembly is installed on the test box and communicated with the test box, the air outlet assembly is used for discharging the cold and hot gas in the test box.

[0008] Preferably, the air inlet assembly comprises a hot air main and a cold air main respectively communicating with the hot air source and the cold air source, the hot air main is communicated with a first air conveying pipe, the cold air main is communicated with a second air conveying pipe, and the ends of the first air conveying pipe, the second air conveying pipe, the hot air main and the cold air main are communicated with a temperature control device for controlling the temperature of the air source entering the test chamber.

[0009] Preferably, the temperature control device comprises a first hot air branch pipe, a first cold air branch pipe, a second hot air branch pipe and a second cold air branch pipe respectively communicating with the hot air main, the cold air main, the first air conveying pipe and the second air conveying pipe, and butterfly valves are installed on the first hot air branch pipe, the first cold air branch pipe, the second hot air branch pipe and the second cold air branch pipe.

[0010] Preferably, the air exhaust assembly comprises an air exhaust cover communicating with the test chamber, the air exhaust cover is provided with an air exhaust hole, and a wind wheel is rotatably connected in the air exhaust cover, the end of the air exhaust cover is provided with a control device at the position of the air exhaust hole, the control device is used for controlling the opening and closing of the air exhaust hole, the shaft center of the wind wheel is connected with a driving device, and the driving device is further connected with the control device.

[0011] Preferably, the driving device comprises a fixed cover fixed to the end of the air exhaust cover, a plurality of groups of through holes are formed in the fixed cover, a fixed ring is fixedly connected to the end of the fixed cover, a motor is fixedly connected to the fixed ring, an output end of the motor is fixedly connected with a driving shaft extending into the air exhaust cover, the driving shaft is rotatably connected with the air exhaust cover, and the end of the driving shaft is fixedly connected with a rotating frame fixedly connected with the wind wheel.

[0012] Preferably, the control device comprises a sealing plate installed on the end of the air exhaust cover, a sealing block matched with the air exhaust hole is fixedly connected to the sealing plate, a plurality of groups of limiting grooves are formed in the sealing plate, a limiting rod fixedly connected with the fixed cover is slidably connected in the limiting groove, and the shaft center of the sealing plate is connected with a moving device for driving the sealing plate to move up and down.

[0013] Preferably, the moving device comprises a threaded pipe sleeved on the outer side surface of the driving shaft, a threaded block fixedly connected with the sealing plate is threadedly connected on the threaded pipe, and an elastic element connected with the driving shaft is sleeved on the outer side surface of the threaded pipe.

[0014] Preferably, the elastic element comprises a fixed sheet fixedly connected with the driving shaft, a spring sleeved on the outer side surfaces of the driving shaft and the threaded pipe is fixedly connected to the fixed sheet, an active sheet is fixedly connected to the end of the spring, and the active sheet is installed on the outer side surface of the threaded pipe.

[0015] Preferably, a handle is fixedly connected to the door body, and a protective sleeve is arranged on the outer side of the handle, so that the door body can be pulled open through the handle, and the protective sleeve can protect the operator's hands.

[0016] Preferably, the hot gas main pipe, the cold gas main pipe, the first gas conveying pipe and the second gas conveying pipe are all installed on the support, so as to improve the stability of the hot gas main pipe, the cold gas main pipe, the first gas conveying pipe and the second gas conveying pipe, and make the cold and hot source conveying more stable.

[0017] Compared with the prior art, the present application has the following advantages: The device for cold and hot impact test of automobile exhaust pipes provided by the present application can realize the cold and hot alternating impact test of two exhaust pipes, improve the test efficiency, and can test the exhaust pipes in batches. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a whole structure schematic view of the present application; Figure 2 It is another view of the whole structure schematic view of the present application; Figure 3 It is a connection structure schematic view of the air inlet assembly and the support frame of the present application; Figure 4 It is a structure schematic view of the air inlet assembly of the present application; Figure 5 It is a structure schematic view of the air exhaust assembly of the present application; Figure 6 It is a local structure schematic view of the air exhaust assembly of the present application; Figure 7 It is a structure schematic view of the control member of the present application; Figure 8 It is a structure schematic view of the moving member of the present application; Figure 9 It is a connection structure schematic view of the sealing plate and the limiting rod of the present application; Figure 10 It is a structure schematic view of the elastic member of the present application.

[0019] In the figure: 1, base; 2, test box; 3, door body; 4, support frame; 5, first cold and hot impact pipe; 6, second cold and hot impact pipe; 7, air inlet assembly; 8, air outlet assembly; 9, hot gas main pipe; 10, cold gas main pipe; 11, first gas conveying pipe; 12, second gas conveying pipe; 13, temperature control element; 14, first hot gas branch pipe; 15, first cold gas branch pipe; 16, second hot gas branch pipe; 17, second cold gas branch pipe; 18, first three-way pipe; 19, second three-way pipe; 20, moving part; 21, air outlet cover; 22, air outlet hole; 23, wind wheel; 24, control part; 25, driving part; 26, fixed cover; 27, through hole; 28, fixing ring; 29, motor; 30, driving shaft; 31, rotating frame; 32, sealing plate; 33, sealing block; 34, limiting groove; 35, limiting rod; 36, threaded block; 37, threaded pipe; 38, elastic part; 39, fixed sheet; 40, spring; 41, movable sheet; 42, handle; 43, first butterfly valve; 44, second butterfly valve; 45, third butterfly valve; 46, fourth butterfly valve. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0021] Please refer to Figures 1-10 The present application provides a technical solution: a cold and hot impact test device for automobile exhaust pipe, comprising a base 1, the end of the base 1 is provided with a test box 2, the test box 2 is provided with a door body 3, and the rear side of the test box 2 is provided with a support frame 4, the support frame 4 is communicated with a first cold and hot impact pipe 5 and a second cold and hot impact pipe 6; further comprising: an air inlet assembly 7, the air inlet assembly 7 is installed on the support frame 4 and connected with the first cold and hot impact pipe 5 and the second cold and hot impact pipe 6, the air inlet assembly 7 conveys cold and hot sources into the test box 2 through the first cold and hot impact pipe 5 and the second cold and hot impact pipe 6, and then conducts cold and hot impact test on the exhaust pipe in the test box 2; an air outlet assembly 8, the air outlet assembly 8 is installed on the test box 2 and communicated with the test box 2, and the air outlet assembly 8 is used for discharging the cold and hot gas in the test box 2.

[0022] Among them, the door body 3 is fixedly connected with a handle 42, the outer side of the handle 42 is provided with a protective sleeve, the handle 42 is convenient for pulling the door body 3 apart, and the protective sleeve is convenient for protecting the hands of the operator.

[0023] In the embodiments of the present application, please refer toFigures 2-4 The air inlet assembly 7 in the drawing comprises a hot air main pipe 9 and a cold air main pipe 10, which are communicated with a hot air source and a cold air source respectively, a first air conveying pipe 11 is communicated with the hot air main pipe 9, a second air conveying pipe 12 is communicated with the cold air main pipe 10, and the ends of the hot air main pipe 9, the cold air main pipe 10, the first air conveying pipe 11 and the second air conveying pipe 12 are communicated with a temperature control device 13, which is used for controlling the temperature of the air source entering the test box 2.

[0024] The hot air main pipe 9, the cold air main pipe 10, the first air conveying pipe 11 and the second air conveying pipe 12 are all installed on the support, so that the stability of the hot air main pipe 9, the cold air main pipe 10, the first air conveying pipe 11 and the second air conveying pipe 12 is improved, and the cold and hot source conveying is more stable.

[0025] In the embodiment of the present application, please refer to Figures 2-4 The temperature control device 13 in the drawing comprises a first hot air branch pipe 14, a first cold air branch pipe 15, a second hot air branch pipe 16 and a second cold air branch pipe 17, which are communicated with the hot air main pipe 9, the cold air main pipe 10, the first air conveying pipe 11 and the second air conveying pipe 12 respectively, and butterfly valves are installed on the first hot air branch pipe 14, the first cold air branch pipe 15, the second hot air branch pipe 16 and the second cold air branch pipe 17.

[0026] In the embodiment of the present application, please refer to Figures 5-7 The air exhaust assembly 8 in the drawing comprises an air exhaust cover 21 which is communicated with the test box 2, an air exhaust hole 22 is formed on the air exhaust cover 21, a wind wheel 23 is rotatably connected in the air exhaust cover 21, a control device 24 is arranged at the end of the air exhaust cover 21 at the position of the air exhaust hole 22, the control device 24 is used for controlling the opening and closing of the air exhaust hole 22, a driving device 25 is connected with the shaft center of the wind wheel 23, and the driving device 25 is also connected with the control device 24.

[0027] In the embodiment of the present application, please refer to Figures 5-7 The driving device 25 in the drawing comprises a fixed cover 26 which is fixed on the end of the air exhaust cover 21, a plurality of groups of through holes 27 are formed on the fixed cover 26, a fixed ring 28 is fixedly connected with the end of the fixed cover 26, a motor 29 is fixedly connected on the fixed ring 28, a driving shaft 30 which extends into the inside of the air exhaust cover 21 is fixedly connected with the output end of the motor 29, the driving shaft 30 is rotatably connected with the air exhaust cover 21, and a rotating frame 31 which is fixedly connected with the wind wheel 23 is fixedly connected with the end of the driving shaft 30.

[0028] In the embodiment of the present application, please refer to Figures 7-9The control component 24 shown in the figure includes a sealing plate 32 installed at the end of the exhaust hood 21. A sealing block 33 adapted to the exhaust hole 22 is fixedly connected to the sealing plate 32. Several sets of limiting grooves 34 are provided on the sealing plate 32. A limiting rod 35 fixedly connected to the fixed cover 26 is slidably connected in the limiting groove 34. A moving component 20 for driving the sealing plate 32 to move up and down is connected to the axis of the sealing plate 32.

[0029] In an embodiment of the present invention, please refer to Figures 7-9 The movable component 20 shown in the figure includes a threaded tube 37 sleeved on the outer side of the drive shaft 30. A threaded block 36 fixedly connected to the sealing plate 32 is threadedly connected to the threaded tube 37, and an elastic component 38 connected to the drive shaft 30 is sleeved on the outer side of the threaded tube 37.

[0030] In an embodiment of the present invention, please refer to Figure 7 and Figure 10 The elastic element 38 shown in the figure includes a fixed plate 39 fixedly connected to the drive shaft 30. A spring 40 is fixedly connected to the fixed plate 39 and sleeved on the outer side of the drive shaft 30 and the threaded tube 37. A movable plate 41 is fixedly connected to the end of the spring 40 and is installed on the outer side of the threaded tube 37.

[0031] Working principle; In the initial state, the second butterfly valve 44 and the fourth butterfly valve 46 remain open, while the third butterfly valve 45 and the first butterfly valve 43 remain closed. At this time, the hot gas main pipe 9 delivers the heat source to the second hot gas branch pipe 16 through the first gas supply pipe 11, and then to the second thermal shock pipe 6 through the second three-way pipe 19. This allows the second thermal shock pipe 6 to continuously deliver hot gas through the second hot gas branch pipe 16, thereby delivering the hot gas into the test chamber of the test chamber 2. In addition, the cold gas main pipe 10 delivers the cold source to the first three-way pipe 18 through the first cold gas branch pipe 15, and then to the first thermal shock pipe 5 through the first three-way pipe 18. This allows the first thermal shock pipe 5 to continuously deliver cold gas through the first cold gas branch pipe 15, allowing the cold gas to enter another test chamber inside the test chamber 2. Further, when the preset test time is reached, the butterfly valves of each group are switched quickly, at this time, the first butterfly valve 43 and the third butterfly valve 45 are opened, and the second butterfly valve 44 and the fourth butterfly valve 46 are closed, at this time, the hot gas main pipe 9 delivers the heat source to the first hot gas branch pipe 14, and then to the first three-way pipe 18 through the first three-way pipe 18, and then to the first cold-hot impact pipe 5, so that the heat source enters the test cavity impacted by the cold gas before through the first cold-hot impact pipe 5, in addition, the cold gas main pipe 10 delivers the cold source to the second cold gas branch pipe 17 through the second gas delivery pipe 12, and then to the second cold-hot impact pipe 6 through the second three-way pipe 19, and then to the test cavity impacted by the heat before through the second cold-hot impact pipe 6, thereby realizing the cold-hot alternating impact test of the two exhaust pipes, improving the test efficiency, and batch testing the exhaust pipes.

[0032] Wherein, before the switching of the butterfly valves of each group, the gas source in the two test cavities needs to be discharged, in this process, the first butterfly valve 43, the second butterfly valve 44, the third butterfly valve 45 and the fourth butterfly valve 46 are all closed, at this time, the control motor 29 is started, after the motor 29 is started, the driving shaft 30 will rotate, the threaded pipe 37 will rotate through the rotation of the driving shaft 30, the threaded block 36 will move through the rotation of the threaded pipe 37, the sealing plate 32 will move through the movement of the threaded pipe 37, the sealing block 33 will move away from the exhaust hole 22 through the movement of the sealing plate 32, and then the exhaust hole 22 is opened, in this process, the rotation of the driving shaft 30 will also drive the rotation of the rotating frame 31, the wind wheel 23 will rotate through the rotation of the rotating frame 31, and the suction force will be generated through the rotation of the wind wheel 23, and then the gas source in the two test cavities in the test box 2 will be discharged through the exhaust hole 22 and the through hole 27 through the action of the suction force, so as to avoid the influence of the residual cold source and heat source on the test of the exhaust pipe, after a period of exhaust, and after the sealing plate 32 is reset, the butterfly valves of each group begin to switch; Wherein, the movement of the sealing plate 32 will gradually move away from the threaded pipe 37 until it is located on the outer side of the driving shaft 30, at this time, the continuous rotation of the driving shaft 30 will not drive the threaded block 36 to continue to move, and at this time, the sealing plate 32 will extrude the movable piece 41 and the spring 40, so that the spring 40 is compressed; Further, after a period of exhaust, the control motor 29 is reversed, at this time, the threaded block 36 on the sealing block 33 is tightly attached to the threaded pipe 37 due to the action of the spring 40, and then when the driving shaft 30 drives the threaded pipe 37 to reverse, the threaded block 36 will move reversely to reset the sealing plate 32, the exhaust hole 22 is sealed through the reset of the sealing plate 32, and then the two cavities are in a sealed state.

[0033] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the scope of the present application is not limited to these specific embodiments.

[0034] While the embodiments of the application have been shown and described herein, it is to be understood that the scope of the application, jointly pointed out in the appended claims, is not limited to the details of the embodiments shown, and that various changes, modifications, substitutions and alterations can be made thereto without departing from the spirit and scope of the application as defined in the following claims and their equivalents.

Claims

1. A device for testing the thermal shock of automobile exhaust pipes, characterized in that, include: A base (1) is provided at the end of the base (1) and a test chamber (2) is provided inside the test chamber (2). The test chamber (2) is divided into two test chambers by the partition. A door (3) is provided on the test chamber (2) and a support frame (4) is provided on the rear side of the test chamber (2). A first thermal shock tube (5) and a second thermal shock tube (6) are connected on the support frame (4). The first thermal shock tube (5) and the second thermal shock tube (6) are respectively connected to the two test chambers. Also includes: An intake assembly (7) is mounted on the support frame (4) and connected to the first thermal shock pipe (5) and the second thermal shock pipe (6). The intake assembly (7) delivers heat and cold sources to the test chamber (2) through the first thermal shock pipe (5) and the second thermal shock pipe (6), thereby conducting a thermal shock test on the exhaust pipe in the test chamber (2). Exhaust assembly (8), which is installed on the test chamber (2) and connected to the test chamber (2), is used to exhaust hot and cold gases in the test chamber (2).

2. The thermal shock testing device for automobile exhaust pipes according to claim 1, characterized in that: The air intake assembly (7) includes a hot air main pipe (9) and a cold air main pipe (10) respectively connected to a hot air source and a cold air source. A first air supply pipe (11) is connected to the hot air main pipe (9), and a second air supply pipe (12) is connected to the cold air main pipe (10). Temperature control devices (13) are connected to the ends of the first air supply pipe (11), the second air supply pipe (12), the hot air main pipe (9), and the cold air main pipe (10). The temperature control devices (13) are used to control the temperature of the air source entering the test chamber (2).

3. The thermal shock testing device for automobile exhaust pipes according to claim 2, characterized in that: The temperature control unit (13) includes a first hot air branch pipe (14), a first cold air branch pipe (15), a second hot air branch pipe (16), and a second cold air branch pipe (17) respectively connected to the hot air main pipe (9), the cold air main pipe (10), the first gas supply pipe (11), and the second gas supply pipe (12). A first butterfly valve (43) is installed on the first hot air branch pipe (14), the first cold air branch pipe (15), the second hot air branch pipe (16), and the second cold air branch pipe (17). The first hot air branch pipe (14) and the first cold air branch pipe (15) are connected to the end of the first three-way pipe (18), and the end of the second hot air branch pipe (16) and the second cold air branch pipe (17) are connected to the end of the second three-way pipe (19). The ends of the first three-way pipe (18) and the second three-way pipe (19) are respectively connected to the first thermal shock pipe (5) and the second cold air shock pipe.

4. The thermal shock testing device for automobile exhaust pipes according to claim 3, characterized in that: The exhaust assembly (8) includes an exhaust hood (21) that communicates with the test chamber (2). The exhaust hood (21) is connected to the two test chambers respectively. An exhaust hole (22) is provided on the exhaust hood (21), and a fan wheel (23) is rotatably connected inside the exhaust hood (21). A control component (24) is provided at the end of the exhaust hood (21) at the position of the exhaust hole (22). The control component (24) is used to control the opening and closing of the exhaust hole (22). A drive component (25) is connected to the axis of the fan wheel (23), and the drive component (25) is also connected to the control component (24).

5. The thermal shock testing device for automobile exhaust pipes according to claim 4, characterized in that: The drive component (25) includes a fixed cover (26) fixed to the end of the exhaust hood (21). The fixed cover (26) has several sets of through holes (27). A fixed ring (28) is fixedly connected to the end of the fixed cover (26). A motor (29) is fixedly connected to the fixed ring (28). A drive shaft (30) extending into the interior of the exhaust hood (21) is fixedly connected to the output end of the motor (29). The drive shaft (30) is rotatably connected to the exhaust hood (21), and a rotating frame (31) fixedly connected to the wind turbine (23) is fixedly connected to the end of the drive shaft (30).

6. The thermal shock testing device for automobile exhaust pipes according to claim 5, characterized in that: The control component (24) includes a sealing plate (32) installed at the end of the exhaust hood (21). A sealing block (33) adapted to the exhaust hole (22) is fixedly connected to the sealing plate (32). A plurality of limiting grooves (34) are provided on the sealing plate (32). A limiting rod (35) fixedly connected to the fixed cover (26) is slidably connected in the limiting groove (34). A moving component (20) for driving the sealing plate (32) to move up and down is connected to the axis of the sealing plate (32).

7. The thermal shock testing device for automobile exhaust pipes according to claim 6, characterized in that: The moving part (20) includes a threaded tube (37) sleeved on the outer side of the drive shaft (30), a threaded block (36) fixedly connected to the sealing plate (32) is threaded on the threaded tube (37), and an elastic element (38) connected to the drive shaft (30) is sleeved on the outer side of the threaded tube (37).

8. The thermal shock testing device for automobile exhaust pipes according to claim 7, characterized in that: The elastic element (38) includes a fixed plate (39) fixedly connected to the drive shaft (30), and a spring (40) fixedly connected to the fixed plate (39) and sleeved on the outer side of the drive shaft (30) and the threaded tube (37). A movable plate (41) is fixedly connected to the end of the spring (40), and the movable plate (41) is installed on the outer side of the threaded tube (37).

9. The thermal shock testing device for automobile exhaust pipes according to claim 8, characterized in that: A handle (42) is fixedly connected to the door body (3), and a protective sleeve is provided on the outer side of the handle (42).

10. The thermal shock testing device for automobile exhaust pipes according to claim 9, characterized in that: The hot air main pipe (9), the cold air main pipe (10), the first gas pipe (11), and the second gas pipe (12) are all installed on the bracket.

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