Diesel engine EGR valve performance test bench

Abstract

The application discloses a diesel engine EGR valve performance test bench and relates to the technical field of valve body testing. The diesel engine EGR valve performance test bench comprises a detection table, a conveying mechanism and a clamping mechanism. The conveying mechanism comprises a conveying frame fixedly connected to the tabletop of the detection table, and a valve body is placed on the conveying frame. The valve body comprises an air inlet, an air outlet and a control motor. The top surface of the conveying frame is fixedly connected with a side guide block, and the side guide block is fixedly connected with a stop rod. When the valve body moves on the conveying frame and the control motor contacts the stop rod, the valve body rotates so that the control motor faces the outer end of the conveying mechanism. The clamping mechanism comprises an inner expansion clamp which is inserted into the air inlet of the valve body. The valve body placed in the reverse position is automatically turned to the normal position by the conveying mechanism. In the subsequent movement, the valve body is rotated to the vertical position, so that the air inlet and the air outlet can be accurately and tightly connected with the air pipe and the exhaust pipe, and the sealing property of the interface is ensured, thereby ensuring the accuracy of the test data.

Description

Technical Field

[0001] This invention relates to the field of valve body testing technology, specifically to a diesel engine EGR valve performance testing bench. Background Technology

[0002] The EGR valve is an indispensable part of exhaust gas recirculation. It reintroduces a portion of the exhaust gas produced after engine combustion into the intake side, allowing it to be drawn back into the cylinders for reuse. This suppresses the formation of nitrogen oxides in the exhaust gas and reduces the pollution caused by engine emissions to the atmosphere. Because precise control of the amount of exhaust gas drawn in is required, detailed performance testing is necessary. This includes simulating the impact of exhaust gas at different temperatures under different engine operating conditions on the EGR valve, and ensuring that the EGR valve can maintain a seal when the valve core is closed.

[0003] Existing EGR valve performance testing benches require precise placement of the EGR valve on the mounting rack before bolting the test tubing to the valve. This results in a significant time commitment for handling the EGR valve during batch testing. Furthermore, since performance testing involves simulating actual operating conditions with exhaust gases at varying temperatures (430°C to 550°C), directly removing the valve after testing would undoubtedly harm personnel. Therefore, cooling the EGR valve is necessary. While the EGR valve itself has cooling pipes, the test tubing lacks a cooling design. When removing the EGR valve, the surrounding exhaust gas supply pipes remain at a high temperature, requiring waiting for the test tubing temperature to drop to a suitable level for valve removal. This further increases the overall testing time, leading to low testing efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a diesel engine EGR valve performance test bench to overcome the shortcomings of the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a diesel engine EGR valve performance test bench, comprising a test bench, wherein an air supply pipe and an exhaust pipe are disposed within the test bench, and further comprising:

[0006] The conveying mechanism includes a conveying frame fixedly connected to the test table surface, a valve body placed on the conveying frame, a clamping mechanism slidably disposed on the conveying frame, and a supporting mechanism disposed at the inner end of the conveying mechanism, the supporting mechanism being located below the exhaust pipe.

[0007] The valve body includes an air inlet, an exhaust outlet, and a control motor. When the valve body is placed on the conveyor frame, the air inlet faces to the right.

[0008] A side guide block is fixedly connected to the top surface of the conveyor frame, and a stop bar is fixedly connected to the side guide block. When the valve body moves on the conveyor frame and the control motor contacts the stop bar, the valve body rotates and the control motor faces the outer end of the conveyor mechanism.

[0009] The clamping mechanism includes an inner expansion clamp, which is inserted into the air inlet of the valve body.

[0010] Preferably, the conveyor frame has a first groove and a second groove. When the valve body is clamped by the clamping mechanism, the air inlet of the valve body abuts against the side of the second groove. After the valve body is placed on the conveyor frame, the bolt connection protrusion on the exhaust port is located in the first groove.

[0011] Preferably, the side guide block has a groove on its side facing the clamping mechanism, and a sliding block is slidably connected in the groove. The groove is composed of a horizontal section and a vertical section, which are connected. The vertical section is adjacent to the support mechanism. The sliding block is composed of a horizontal slider and a vertical slider. The vertical slider is slidably connected to the side of the horizontal slider. A friction disc is rotatably mounted on the side of the vertical slider. After the horizontal slider moves to the top of the vertical section, the vertical slider slides downward. The friction disc abuts against the end of the valve body away from the air inlet.

[0012] Preferably, the clamping mechanism further includes a sliding shell slidably connected to the conveyor frame and a side plate fixedly connected to the conveyor frame away from the side guide block. A sliding frame is slidably connected inside the sliding shell, and a damping ring is sleeved inside the sliding frame. The inner expansion clamp is fixedly sleeved on the inner ring of the damping ring. A traction block is fixedly sleeved inside the inner expansion clamp. A gear is fixedly sleeved on the outer periphery of the inner expansion clamp. A rack fixed to the conveyor frame is provided on the moving path of the clamping mechanism. After the gear meshes with the rack, it drives the inner expansion clamp to rotate 90°. A protruding section is provided on the side of the side plate facing the sliding shell.

[0013] Preferably, a second spring is elastically connected between the sliding shell and the sliding frame, and the second spring causes the sliding frame to move towards the side plate and then reset the sliding frame.

[0014] Preferably, the inner expansion clamp includes a sliding rod slidably connected therein, with a clamping block slidably connected to one end of the sliding rod away from the side plate, and a spring sleeved on the sliding rod. When the sliding rod is in the protruding section of the side plate, it is pushed to cause the clamping block to clamp the valve body from inside the air inlet of the valve body.

[0015] Preferably, the supporting mechanism includes a bracket that moves vertically driven by a telescopic rod, a side frame is fixedly connected to the side of the bracket, a sliding column is provided on the top surface of the side frame and a guide push block is slidably connected thereto, and the clamping mechanism moves away from the valve body after approaching the guide push block so that the inner expansion clamp leaves the valve body.

[0016] Preferably, a baffle is fixedly connected to the inner top surface of the conveyor frame. When the bracket moves the valve body above it downward, the baffle contacts the valve body to ensure that the exhaust port of the valve body remains vertically upward.

[0017] Preferably, a spring is elastically connected between the top surface of the side frame and the bottom surface of the guide push block. The top surface of the guide push block has an inclined clamping surface. When the clamping mechanism is at the end of its stroke and the bracket moves upward again, the guide push block contacts the clamping mechanism, causing the spring to be compressed, so that the guide push block cannot release the state of inserting the inner expansion clamp into the air inlet.

[0018] Preferably, the testing platform further includes a control cabinet, and both the air supply pipe and the exhaust pipe are driven by telescopic rods to connect with the corresponding interfaces of the valve body.

[0019] The beneficial effects of this invention are as follows:

[0020] 1. In this invention, through the set conveying mechanism, after the valve body is placed on the conveying frame, as the valve body is conveyed, the valve body that was placed in the reverse position will be automatically flipped to the correct position. This allows the valve body to be driven to rotate to the vertical position with the control motor facing upward during the subsequent movement. This ensures that the air inlet and outlet can be accurately and tightly connected with the air supply pipe and exhaust pipe during subsequent testing, ensuring the sealing of the interface and guaranteeing the accuracy of the test data.

[0021] 2. Simultaneously, after the test is completed, the valve body is transported to the starting position of the conveyor frame by reversing the clamping mechanism. During this process, the valve body is rotated from the vertical position to the positive position to prevent the valve body from shaking and quickly tipping over to the conveyor frame while it is in the vertical position during the transport process, thus ensuring the stability of the valve body during the transport process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the conveying mechanism, clamping mechanism, and supporting mechanism of the present invention;

[0024] Figure 3 This is a schematic cross-sectional view of the conveyor frame of the present invention;

[0025] Figure 4 For the present invention Figure 2 Left side view structural diagram;

[0026] Figure 5 This is a schematic diagram of the clamping mechanism of the present invention;

[0027] Figure 6 This is a cross-sectional view of the clamping mechanism of the present invention;

[0028] Figure 7 For the present invention Figure 6 Enlarged view of point A in the middle;

[0029] Figure 8 This is a schematic diagram of the supporting mechanism and conveyor frame structure of the present invention;

[0030] Figure 9 This is a schematic diagram of the valve body's upright position structure according to the present invention;

[0031] Figure 10 This is a schematic diagram of the valve body reversal structure of the present invention;

[0032] Figure 11 This is a schematic diagram of the valve body structure after rotation according to the present invention;

[0033] Figure 12 This is a schematic diagram of the valve body structure of the present invention.

[0034] In the diagram: 1. Testing platform; 11. Air supply pipe; 12. Exhaust pipe; 13. Control cabinet; 2. Conveying mechanism; 21. Conveying frame; 211. First groove; 212. Second groove; 22. Side guide block; 23. Stop bar; 24. Slide groove; 241. Horizontal section; 242. Vertical section; 25. Sliding block; 251. Horizontal slider; 252. Vertical slider; 253. Friction disc; 3. Clamping mechanism; 31. Sliding shell; 32. Damping ring; 33. Inner expansion clamp; 331. Sliding rod; 332. Clamping block; 333. Spring 1; 34. Sliding frame; 341. Spring 2; 35. Gear; 36. Rack; 37. Traction block; 38. Side plate; 4. Supporting mechanism; 41. Bracket; 42. Side frame; 43. Guide push block; 44. Spring 3; 45. Slanted card surface; 46. Baffle; 5. Valve body; 51. Air inlet; 52. Exhaust port; 53. Control motor. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] like Figures 1 to 12 As shown in the figure, an embodiment of the present invention provides a diesel engine EGR valve performance test bench, including a test bench 1, wherein an air supply pipe 11 and an exhaust pipe 12 are provided in the test bench 1, and further includes:

[0037] The conveying mechanism 2 includes a conveying frame 21 fixedly connected to the table surface of the testing table 1, a valve body 5 placed on the conveying frame 21, a clamping mechanism 3 slidably arranged on the conveying frame 21, and a supporting mechanism 4 arranged at the inner end of the conveying mechanism 2, the supporting mechanism 4 being located below the exhaust pipe 12.

[0038] The valve body 5 includes an air inlet 51, an exhaust port 52, and a control motor 53. When the valve body 5 is placed on the conveyor frame 21, the air inlet 51 faces to the right.

[0039] A side guide block 22 is fixedly connected to the top surface of the conveyor frame 21, and a stop bar 23 is fixedly connected to the side guide block 22. When the valve body 5 moves on the conveyor frame 21 and the control motor 53 contacts the stop bar 23, the valve body 5 rotates and the control motor 53 faces the outer end of the conveyor mechanism 2.

[0040] The clamping mechanism 3 includes an inner expansion clamp 33, which is inserted into the air inlet 51 of the valve body 5.

[0041] It should be noted that, as Figures 9 to 11 As shown, after the valve body 5 is placed on the conveyor frame 21, two states will occur. The first is that the control motor 53 of the valve body 5 faces the outer end of the conveyor frame 21 (the end furthest from the supporting mechanism 4), and the control motor 53 is in a horizontal state (the valve body 5 is in the positive position). The second is that the control motor 53 of the valve body 5 faces the inner end of the conveyor frame 21 (the end closest to the supporting mechanism 4), and the control motor 53 is in an upward tilted state (the valve body 5 is in the reverse position). When the valve body 5 moves towards the inner end of the conveyor frame 21, when the valve body 5 is in the reverse position, its upward tilted control motor 53 will contact the stop bar 23, causing the valve body 5 to flip under the obstruction of the stop bar 23. The valve body 5, which was in the reverse position, rotates to the positive position. This ensures that in the subsequent clamping and rotation process, the exhaust port 52 of the valve body 5 faces the designated direction before rotation begins. After the valve body 5 is rotated, it will appear as shown... Figure 11 As shown, with the control motor 53 pointing directly upwards, the valve body 5 continues to be driven forward and enters the support mechanism 4, and then moves downwards into the detection position as the support mechanism 4 operates.

[0042] In this invention, the conveying mechanism 2 automatically flips the valve body 5 from its reversed position to its upright position as the valve body 5 is conveyed, after the valve body 5 is placed on the conveying frame 21. This allows the valve body 5 to be rotated to a vertical position with the control motor 53 facing upwards during subsequent movement. This ensures that the air inlet 51 and the exhaust outlet 52 can be accurately and tightly connected with the air supply pipe 11 and the exhaust pipe 12 during subsequent testing, ensuring the sealing of the interface and guaranteeing the accuracy of the test data.

[0043] Meanwhile, after the test is completed, the valve body 5 is transported to the starting position of the conveyor frame 21 by the reverse movement clamping mechanism 3. At the same time, the valve body 5 is rotated from the vertical position to the positive position during the process to prevent the valve body 5 from shaking and quickly tilting towards the conveyor frame 21 when it is in the vertical position during the transport process, thus ensuring the stability of the valve body 5 during the transport process.

[0044] In this embodiment, the conveyor frame 21 is provided with a first groove 211 and a second groove 212. When the valve body 5 is clamped by the clamping mechanism 3, the air inlet 51 of the valve body 5 abuts against the side of the second groove 212. After the valve body 5 is placed on the conveyor frame 21, the bolt connection protrusion on the exhaust port 52 is located in the first groove 211.

[0045] like Figure 2 and Figure 4 As shown, the height of the second groove 212 near the clamping mechanism 3 is higher than the conveying plane of the conveying frame 21. After the valve body 5 is placed on the conveying frame 21, by pushing the valve body 5 toward the clamping mechanism 3, the end face of the valve body 5 with the air inlet 51 will abut against the protruding part of the second groove 212, so that the valve body 5 can be initially aligned. At the same time, the second groove 212 also leaves rotation space for the flange on the end face of the valve body 5.

[0046] In this embodiment, the side guide block 22 has a groove 24 on the side facing the clamping mechanism 3. A sliding block 25 is slidably connected in the groove 24. The groove 24 is composed of a horizontal section 241 and a vertical section 242. The horizontal section 241 and the vertical section 242 are connected. The vertical section 242 is adjacent to the support mechanism 4. The sliding block 25 is composed of a horizontal slider 251 and a vertical slider 252. The vertical slider 252 is slidably connected to the side of the horizontal slider 251. A friction disk 253 is rotatably installed on the side of the vertical slider 252. After the horizontal slider 251 moves to the top of the vertical section 242, the vertical slider 252 slides downward. The friction disk 253 abuts against the end of the valve body 5 away from the air inlet 51.

[0047] like Figures 2 to 3 As shown, by setting a sliding groove 24 divided into a horizontal section 241 and a vertical section 242, and a sliding block 25 divided into a horizontal slider 251 and a vertical slider 252, the friction disc 253 can always be in contact with one end of the valve body 5 (the opposite end of the valve body 5 with the air inlet 51) when the valve body 5 is horizontally and vertically displaced. On the one hand, when the air supply pipe 11 is driven by the telescopic rod to insert into the air inlet 51 of the valve body 5 during measurement, one end of the valve body 5 is blocked by the friction disc 253 to ensure the sealing effect after the air supply pipe 11 is inserted. On the other hand, since the friction disc 253 abuts against one end of the valve body 5, and the sliding block 25 slides in the sliding groove 24, when the clamping mechanism 3 drives the valve body 5 to move, the other end of the valve body 5 will also move synchronously, ensuring that the valve body 5 will not deflect during the movement and ensuring that the valve body 5 can accurately enter the support mechanism 4.

[0048] In this embodiment, the clamping mechanism 3 further includes a sliding shell 31 slidably connected to the conveyor frame 21 and a side plate 38 fixedly connected to the conveyor frame 21 away from the side guide block 22. A sliding frame 34 is slidably connected inside the sliding shell 31. A damping ring 32 is sleeved inside the sliding frame 34. An inner expansion clamp 33 is fixedly sleeved on the inner ring of the damping ring 32. A traction block 37 is fixedly sleeved inside the inner expansion clamp 33. A gear 35 is fixedly sleeved on the outer periphery of the inner expansion clamp 33. A rack 36 fixed on the conveyor frame 21 is provided on the moving path of the clamping mechanism 3. After the gear 35 meshes with the rack 36, it drives the inner expansion clamp 33 to rotate 90°. A protruding section is provided on the side of the side plate 38 facing the sliding shell 31.

[0049] like Figures 2 to 6 As shown, when the clamping mechanism 3 is at the starting point of the moving path, since the sliding shell 31 is in the non-protruding section of the side plate 38, the inner expansion clamp 33 can be pushed and avoided by the valve body 5. After pushing the valve body 5 forward, the inner expansion clamp 33 is inserted into the valve body 5 through the air inlet 51. As the inner expansion clamp 33 moves together with the sliding shell 31, the valve body 5 will move under the drive of the inner expansion clamp 33. When the valve body 5 is in the reverse position, the valve body 5 is turned to the positive position by the obstruction of the stop bar 23. The damping ring 32 can reduce the rotation speed of the inner expansion clamp 33, so that the rotation speed of the valve body 5 inserted by the inner expansion clamp 33 is slowed down, ensuring that the speed of the valve body 5 when rotating from the reverse position to the positive position is not too fast, avoiding the valve body 5 from falling on the conveying plane of the conveying frame 21, ensuring the service life of the conveying frame 21, and also ensuring that the valve body 5 will not be damaged during rotation.

[0050] When the clamping mechanism 3 is about to approach the rack 36, the sliding shell 31 will enter the protruding section of the side plate 38. As the sliding rod 331 is pushed, the clamping block 332 slides obliquely outward, causing the inner expansion clamp 33 to open, further fixing the valve body 5 and ensuring that the valve body 5 can rotate synchronously with the inner expansion clamp 33. In this way, after the gear 35 meshes with the rack 36, the valve body 5, which is in the correct position, is rotated to the vertical position, making it convenient to enter the support mechanism 4 for subsequent testing.

[0051] Specifically, the meshing position of gear 35 and rack 36 only needs to be set between rotating the valve body 5 from the reverse position to the positive position and entering the support mechanism 4.

[0052] In this embodiment, a second spring 341 is elastically connected between the sliding shell 31 and the sliding frame 34. The second spring 341 causes the sliding frame 34 to move towards the side plate 38 and then resets the sliding frame 34.

[0053] When the inner expansion clamp 33 is squeezed by the valve body 5 or the traction block 37 moves outward, the sliding frame 34 will slide inside the sliding shell 31, causing the inner expansion clamp 33 to move away from the valve body 5. As the inner expansion clamp 33 becomes concentric with the air inlet 51 of the valve body 5, under the rebound action of the second spring 341, the inner expansion clamp 33 is inserted into the air inlet 51 of the valve body 5 and automatically connects.

[0054] In this embodiment, the inner expansion clamp 33 includes a sliding rod 331 slidably connected inside it. A clamping block 332 is slidably connected to one end of the sliding rod 331 away from the side plate 38. A spring 333 is sleeved on the sliding rod 331. When the sliding rod 331 is in the protruding section of the side plate 38, it is pushed so that the clamping block 332 clamps the valve body 5 from the air inlet 51 inside the valve body 5.

[0055] like Figures 4 to 7 As shown, the groove of the inner expansion clamp 33 that accommodates the clamping block 332 is provided with an inclined surface, so that when the sliding rod 331 is pushed towards the clamping block 332, the clamping block 332 is pushed outward, so that the clamping block 332 clamps the outer valve body 5. When the sliding rod 331 is pushed back to its original position by the spring 333, the clamping block 332 will retract into the inner expansion clamp 33 under the action of the sliding rod 331. Thus, during the linear movement of the clamping mechanism 3, the clamping state of the inner expansion clamp 33 is switched according to the contact state between the sliding rod 331 and the side plate 38, ensuring that the valve body 5 can be accurately clamped and rotated during the movement.

[0056] In this embodiment, the supporting mechanism 4 includes a bracket 41 that moves vertically driven by a telescopic rod. A side frame 42 is fixedly connected to the side of the bracket 41. A sliding column is provided on the top surface of the side frame 42 and a guide push block 43 is slidably connected to it. After the clamping mechanism 3 approaches the guide push block 43, it moves in a direction away from the valve body 5 so that the inner expansion clamp 33 leaves the valve body 5.

[0057] like Figures 1 to 8 As shown, the telescopic rod that drives the bracket 41 to move vertically is embedded in the test table 1. The inner side of the bracket 41 is similar in shape to the valve body 5, thereby ensuring the stability of the valve body 5 after entering the bracket 41. One side of the guide push block 43 is set as an arc slope. When the clamping mechanism 3 is about to enter the end of its movement path, the slope of the traction block 37 will contact the guide push block 43, so that the guide push block 43 pushes the traction block 37 away from the sliding shell 31. At this time, the traction block 37 will drive the inner expansion clamp 33 to move, so that it separates from the valve body 5. Thus, when the clamping mechanism 3 enters the end of its movement stroke, the connection between the inner expansion clamp 33 and the valve body 5 is automatically disconnected, so that the valve body 5 can move down with the bracket 41 into the test position.

[0058] In this embodiment, a baffle 46 is fixedly connected to the inner top surface of the conveyor frame 21. When the bracket 41 moves the valve body 5 above it downward, the baffle 46 contacts the valve body 5 to ensure that the exhaust port 52 of the valve body 5 remains vertically upward.

[0059] like Figure 8 As shown, a fixed baffle 46 is set on one side of the notch of the bracket 41. When the valve body 5 is driven horizontally into the bracket 41, as the bracket 41 moves downward, when the valve body 5 is about to tilt to the side of the notch of the bracket 41, the valve body 5 will contact the baffle 46 to prevent the valve body 5 from tilting. This ensures the airtightness of the connection between the exhaust port 52 and the exhaust pipe 12 when they are connected later. This ensures that the test exhaust gas passing through the valve body 5 can completely flow into the exhaust pipe 12 and that the sensor in the exhaust pipe 12 can obtain the correct parameters.

[0060] In this embodiment, a spring 44 is elastically connected between the top surface of the side frame 42 and the bottom surface of the guide push block 43. The top surface of the guide push block 43 is provided with an inclined clamping surface 45. When the clamping mechanism 3 is at the end of its stroke and the bracket 41 moves upward again, the guide push block 43 contacts the clamping mechanism 3, causing the spring 44 to be compressed, so that the guide push block 43 cannot release the state of the inner expansion clamp 33 being inserted into the air inlet 51.

[0061] like Figure 2 and Figure 8 As shown, when the bracket 41 moves the side frame 42 downwards synchronously, the guide push block 43 will also move downwards synchronously. At this time, the guide push block 43 will separate from the traction block 37. Under the rebound action of the spring 341, the traction block 37 will slide towards the sliding shell 31. At this time, in the vertical direction, the guide push block 43 will overlap with the traction block 37. After the valve body 5 is tested, as the bracket 41 moves upwards, the guide push block 43 will come into contact with the traction block 37 and be blocked during the upward movement (at this time, the bracket 41 can continue to move upwards, while...). The traction block 37 will block the guide push block 43, preventing the guide push block 43 from moving upwards and compressing the spring 44. When the bracket 41 returns to the top of the vertical movement path, the inner expansion clamp 33 of the clamping mechanism 3 will re-insert into the valve body 5. As the clamping mechanism 3 returns with the valve body 5, the traction block 37 moves away from the guide push block 43 and returns to its initial position under the rebound action of the spring 44. Thus, it is only unlocked when the clamping mechanism 3 enters the end of the movement stroke, ensuring that the clamping mechanism 3 can drive the valve body 5 back after the detection is completed.

[0062] In this embodiment, the testing station 1 also includes a control cabinet 13, and the air supply pipe 11 and the exhaust pipe 12 are both driven by telescopic rods to connect with the corresponding interfaces of the valve body 5.

[0063] like Figure 1As shown, the control cabinet 13 includes a display screen and multiple control buttons. When the air supply pipe 11 and the exhaust pipe 12 are connected to the air inlet 51 and the exhaust port 52 of the valve body 5, the exhaust pipe 12 connected to the exhaust port 52 will simultaneously insert the control cable of the control motor 53, so that the control cabinet 13 can control the control motor 53 of the valve body 5, which facilitates the collection and recording of test parameters.

[0064] It should be noted that the horizontal slider 251 and the sliding shell 31 in this invention are both driven by an external drive to move linearly (such as a linear motor, lead screw, etc.), and when the horizontal slider 251 and the sliding shell 31 are at the starting point of their movement stroke, there will be a matching locking structure to prevent the horizontal slider 251 and the sliding shell 31 from sliding under external pushing.

[0065] Working principle:

[0066] When performing relevant performance tests on the valve body 5 using this test bench, first place the valve body 5 on the conveyor frame 21 and push the valve body 5 towards the clamping mechanism 3 so that the flange at the air inlet 51 of the valve body 5 abuts against the side of the second groove 212. At this time, the protrusion on the side of the exhaust port 52 of the valve body 5 used to install bolts will enter the first groove 211. Then push the valve body 5 forward so that the inner expansion clamp 33 of the clamping mechanism 3 is inserted into the air inlet 51. At this time, the other end of the valve body 5 will abut against the friction disc 253.

[0067] Alternatively, the starting position of the clamping mechanism 3 can be set closer to the outer end of the conveyor frame 21. When placing the valve body 5, the air inlet 51 of the valve body 5 can be directly aligned with the inner expansion clamp 33 and then the valve body 5 can be pushed forward so that the friction disc 253 abuts against the valve body 5.

[0068] After the clamping mechanism 3 clamps the valve body 5, it drives the sliding housing 31 and the sliding block 25 to move, conveying the valve body 5 to the rear end of the conveyor frame 21. At this time, when the valve body 5 is in the reverse position, the stop bar 23 will cause the moving valve body 5 to rotate (at this time, the inner expansion clamp 33 remains inserted into the air inlet 51), causing the valve body 5 to rotate from the reverse position to the upright position (it should be noted that when the valve body 5 is placed in the upright position, the control motor 53 will not contact the stop bar 23). As the sliding housing 31 continues to move, it reaches the protruding section of the side plate 38, thereby pushing the sliding housing 31 to move. The moving rod 331 causes the clamping block 332 to clamp the valve body 5 from the inside, ensuring that the inner expansion clamp 33 will synchronously drive the valve body 5 to rotate when it rotates. As the sliding shell 31 continues to move, the gear 35 meshes with the rack 36, driving the valve body 5 to rotate from the positive position to the vertical position (i.e., the state when it is in the detection stage). Then, as the sliding shell 31 continues to move to the end of its stroke, under the drive of the guide push block 43, the traction block 37 drives the inner expansion clamp 33 to move and be pulled out from the air inlet 51. At this time, the valve body 5 is on the bracket 41 and moves down through the bracket 41 to enter the detection position.

[0069] When the valve body 5 enters the detection position, the air supply pipe 11 is connected to the air inlet 51, and the exhaust pipe 12 is connected to the exhaust port 52. At the same time, when connecting the exhaust pipe 12 to the exhaust port 52, the cable plug is inserted into the socket of the control motor 53, so that the tester can control various parameters during the test through the control cabinet 13 and record the data.

[0070] After the test is completed, the bracket 41 is moved upward. After the bracket 41 is moved upward, the inner expansion clamp 33 will be reinserted into the air inlet 51, and the vertical slider 252 will reconnect with the horizontal slider 251 (that is, the vertical slider 252 will return to the state of being combined with the horizontal slider 251. Since the bracket 41 drives the valve body 5 to move upward, and the friction disc 253 contacts the valve body 5, the vertical slider 252 will move upward at the same time as the valve body 5 moves upward). This allows the sliding shell 31 and the sliding block 25 to carry the valve body 5 back. When the valve body 5 just starts to return, it is still in the vertical position. After the sliding shell 31 passes the rack 36, the meshing of the rack 36 and the gear 35 will rotate the valve body 5 to the correct position. As the sliding shell 31 and the sliding block 25 move to the starting position, the valve body 5 enters the outer end of the conveyor frame 21 for easy removal by the tester.

[0071] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A diesel engine EGR valve performance test bench, comprising a test bench (1), wherein the test bench (1) is provided with an air supply pipe (11) and an exhaust pipe (12), characterized in that, Also includes: The conveying mechanism (2) includes a conveying frame (21) fixedly connected to the table surface of the testing table (1), a valve body (5) is placed on the conveying frame (21), a clamping mechanism (3) is slidably arranged on the conveying frame (21), and a supporting mechanism (4) is provided at the inner end of the conveying mechanism (2), and the supporting mechanism (4) is located below the exhaust pipe (12). The valve body (5) includes an air inlet (51), an exhaust outlet (52) and a control motor (53). When the valve body (5) is placed on the conveyor frame (21), the air inlet (51) faces to the right. A side guide block (22) is fixedly connected to the top surface of the conveyor frame (21), and a stop bar (23) is fixedly connected to the side guide block (22). When the valve body (5) moves on the conveyor frame (21) and the control motor (53) contacts the stop bar (23), the valve body (5) rotates and the control motor (53) faces the outer end of the conveyor mechanism (2). The clamping mechanism (3) includes an inner expansion clamp (33), which is inserted into the air inlet (51) of the valve body (5).

2. The diesel engine EGR valve performance test bench according to claim 1, characterized in that: The conveyor frame (21) has a first groove (211) and a second groove (212). When the valve body (5) is clamped by the clamping mechanism (3), the air inlet (51) of the valve body (5) abuts against the side of the second groove (212). After the valve body (5) is placed on the conveyor frame (21), the bolt connection protrusion on the exhaust port (52) is located in the first groove (211).

3. The diesel engine EGR valve performance test bench according to claim 1, characterized in that: The side guide block (22) has a groove (24) on the side facing the clamping mechanism (3). A sliding block (25) is slidably connected in the groove (24). The groove (24) is composed of a horizontal section (241) and a vertical section (242). The horizontal section (241) and the vertical section (242) are connected. The vertical section (242) is close to the support mechanism (4). The sliding block (25) is composed of a horizontal slider (251) and a vertical slider (252). The vertical slider (252) is slidably connected to the side of the horizontal slider (251). A friction disk (253) is rotatably installed on the side of the vertical slider (252). After the horizontal slider (251) moves to the top of the vertical section (242), the vertical slider (252) slides downward. The friction disk (253) abuts against the end of the valve body (5) away from the air inlet (51).

4. The diesel engine EGR valve performance test bench according to claim 1, characterized in that: The clamping mechanism (3) further includes a sliding shell (31) slidably connected to the conveyor frame (21) and a side plate (38) fixedly connected to the conveyor frame (21) away from the side guide block (22). A sliding frame (34) is slidably connected inside the sliding shell (31). A damping ring (32) is sleeved inside the sliding frame (34). The inner expansion clamp (33) is fixedly sleeved on the inner ring of the damping ring (32). A traction block (37) is fixedly sleeved inside the inner expansion clamp (33). A gear (35) is fixedly sleeved on the outer periphery of the inner expansion clamp (33). A rack (36) fixed on the conveyor frame (21) is provided on the moving path of the clamping mechanism (3). After the gear (35) meshes with the rack (36), it drives the inner expansion clamp (33) to rotate 90°. A protruding section is provided on the side of the side plate (38) facing the sliding shell (31).

5. The diesel engine EGR valve performance test bench according to claim 4, characterized in that: A second spring (341) is elastically connected between the sliding shell (31) and the sliding frame (34). The second spring (341) causes the sliding frame (34) to move towards the side plate (38) and then resets the sliding frame (34).

6. The diesel engine EGR valve performance test bench according to claim 4, characterized in that: The inner expansion clamp (33) includes a sliding rod (331) slidably connected inside it. A clamping block (332) is slidably connected to one end of the sliding rod (331) away from the side plate (38). A spring (333) is sleeved on the sliding rod (331). When the sliding rod (331) is in the protruding section of the side plate (38), it is pushed to make the clamping block (332) clamp the valve body (5) from the air inlet (51) inside the valve body (5).

7. The diesel engine EGR valve performance test bench according to claim 1, characterized in that: The supporting mechanism (4) includes a bracket (41) that moves vertically driven by a telescopic rod. A side frame (42) is fixedly connected to the side of the bracket (41). A sliding column is provided on the top surface of the side frame (42) and a guide push block (43) is slidably connected to it. The clamping mechanism (3) moves away from the valve body (5) after approaching the guide push block (43) so that the inner expansion clamp (33) leaves the valve body (5).

8. The diesel engine EGR valve performance test bench according to claim 7, characterized in that: A baffle (46) is fixedly connected to the inner top surface of the conveyor frame (21). When the bracket (41) moves the valve body (5) above it downward, the baffle (46) contacts the valve body (5) to ensure that the exhaust port (52) of the valve body (5) remains vertically upward.

9. A diesel engine EGR valve performance test bench according to claim 7, characterized in that: A spring three (44) is elastically connected between the top surface of the side frame (42) and the bottom surface of the guide push block (43). The top surface of the guide push block (43) is provided with a slanted clamping surface (45). When the clamping mechanism (3) is at the end of its stroke and the bracket (41) moves up again, the guide push block (43) contacts the clamping mechanism (3) and the spring three (44) is compressed, so that the guide push block (43) cannot release the inner expansion clamp (33) and insert it into the air inlet (51).

10. A diesel engine EGR valve performance test bench according to claim 1, characterized in that: The testing station (1) also includes a control cabinet (13), and the air supply pipe (11) and the exhaust pipe (12) are both driven by telescopic rods to connect with the corresponding interfaces of the valve body (5).

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