A device for detecting the strength of an engine exhaust check valve disc

Abstract

The present invention discloses a device for detecting the strength of a valve disc of an engine exhaust check valve, comprising a detection frame, a valve disc and a valve disc spring, wherein an upper horizontal plate and a lower horizontal plate are provided in the middle of the detection frame, the upper end of the lower horizontal plate is movably connected to a support frame for mounting the valve disc, a plurality of punches for punching the valve disc are provided on the lifting frame, the distance between the punches and the valve disc is adjusted by an adjustment mechanism, the valve disc spring is located between the support frame and the lower horizontal plate, a counter for monitoring the number of punching times of the punches is provided at the upper end of the upper horizontal plate, and a distance measuring sensor for real-time monitoring of the shape change of the valve disc is provided at the upper end of the lower horizontal plate. The present invention drives the punches to reciprocate and impact the valve disc through an impact mechanism, and provides a valve disc spring, which can more accurately simulate the actual situation of the valve disc when it is working, and can adjust the different distances between each punch and the valve disc through the adjustment mechanism, so as to facilitate horizontal comparison of valve discs of the same model.

Description

Technical Field

[0001] The present invention relates to the technical field of one-way valve detection, and in particular to a device for detecting the strength of a valve plate of an engine exhaust one-way valve. Background Art

[0002] The disc of an engine exhaust check valve is the component's core functional element. Its primary function is to control exhaust flow (allowing one-way exhaust gas discharge while preventing backflow). It withstands complex operating conditions such as exhaust pressure, temperature, and airflow impact during engine operation. A thin circular disc typically passes through the disc, secured within the valve body by a spring or elastic support. The spring force holds the disc closed, and it opens when exhaust pressure overcomes the spring force. Although small, the disc directly impacts the engine's power, economy, and emissions performance. Therefore, its material selection and structural design are crucial. Therefore, strength testing of the disc is crucial to ensuring proper operation and preventing engine performance degradation or failure due to disc failure.

[0003] A Chinese invention patent with the announcement number CN119198056A discloses a valve plate fatigue test device, which includes a punch assembly and a drive assembly. The punch assembly is distributed in a circle, and a valve plate is installed on the outside of the punch assembly. The drive assembly is arranged on the inside of the punch assembly. The drive assembly drives the punch assembly to intermittently extend and retract to impact the valve plate to simulate the closing of the valve plate. The drive assembly is also connected to an adjustment assembly to adjust the impact strength of the drive assembly; by setting the drive assembly, the punch assembly is driven to intermittently and repeatedly impact the valve plate to drive the valve plate to repeatedly open, simulating the exhaust process under the working conditions of the valve plate, so that the valve plate test results are more accurate; in addition, the drive assembly can be adjusted through the adjustment assembly, so that the different loading strengths of the drive assembly on the punch assembly can be changed, so that the test device can meet different loading strength requirements. Regarding the above-mentioned related technologies, the inventor believes that the following defects exist: when testing the valve plate, it is necessary to test the valve plate with different materials and different impact strengths. In this scheme, the impact strength of each punch on the valve plate is the same. Multiple tests are required when testing different impact strengths, which is more troublesome. Even if the impact strength of the driving component can be adjusted by the adjustment component, the impact strength of the punch is the same when the valve plate is tested at the same time. Moreover, when the adjustment component adjusts the impact strength of the driving component, it is difficult to adjust accurately without a specific adjustment scale. Moreover, the deformation condition of the valve plate cannot be monitored in real time during the valve plate detection process, which will affect the judgment of the test results. In addition, the valve plate is used in conjunction with the valve plate spring. If the valve plate is fixed and directly impacted, this is inconsistent with the actual working condition of the valve plate. Therefore, there will be a large error between the test result and the actual situation. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for detecting the strength of a valve plate of an engine exhaust check valve, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a device for testing the strength of a valve disc of an engine exhaust check valve, comprising a testing frame, a valve disc, and a valve disc spring. When the check valve is in operation, the valve disc is reset by the valve disc spring. Two horizontal plates are provided in the middle of the testing frame, including an upper horizontal plate and a lower horizontal plate, with the upper horizontal plate being located above the lower horizontal plate.

[0006] The upper end of the lower horizontal plate is movably connected to a supporting frame for mounting the valve plate, and the valve plate is fixed to the inner side of the upper end of the supporting frame by a limiting mechanism;

[0007] The upper end of the upper horizontal plate is movably connected to a lifting frame, and the lifting frame is controlled by an impact mechanism to move up and down;

[0008] The lifting frame is provided with a plurality of punching rods for punching the valve plate, and the distance between the punching rods and the valve plate is adjusted by an adjusting mechanism to adjust the impact strength on the valve plate;

[0009] The valve spring is located between the support frame and the lower cross plate and is used to reset the support frame and the valve. The valve spring is limited by the limiting assembly and the tightness of the valve spring is adjusted.

[0010] A counter for monitoring the number of punching times of the punch rod is provided at the upper end of the upper horizontal plate;

[0011] The upper end of the lower horizontal plate is provided with a distance measuring sensor for real-time monitoring of the shape change of the valve plate.

[0012] Preferably, the adjustment mechanism includes a fixed plate located on one side of the upper horizontal plate, the fixed plate is rotatably mounted with a gear, the gear is controlled to rotate by a knob, and the upper end of the punch rod is provided with a round rack, the round rack is meshed with the gear;

[0013] A circular adjustment scale is provided on the front of the fixing plate, and a triangular indicator block matching the adjustment scale is provided on one end face of the knob;

[0014] The plunger is controlled by rotating the knob 1 to raise and lower the plunger, and the specific distance of the plunger's rise and fall can be adjusted according to the adjustment scale;

[0015] The calculation formula of the punch lift distance L is: ;

[0016] Among them, m is the gear module, z is the number of gear teeth, is the rotation angle of knob 1, , m and z are all known numbers, and L is set as a constant, so the formula can be used to calculate The number obtained Numbers are engraved on the front of the fixing plate, forming the adjustment scale.

[0017] Preferably, the carrier includes a bottom plate, a plurality of guide rods are provided at the bottom of the bottom plate, the guide rods are connected to the lower horizontal plate in an up-and-down sliding manner, and a limit block is provided at a lower end of the guide rod for limiting the position of the carrier;

[0018] A carrying cylinder is provided at the upper end of the bottom plate, a placing platform is provided inside the carrying cylinder, and the middle portion of the placing platform is a hollow structure, and the valve plate is located at the upper end of the placing platform.

[0019] Preferably, the limiting mechanism includes a plurality of limiting rods radially mounted around the bearing cylinder, and the limiting rods are slidably connected to the bearing cylinder, one end of the limiting rod is provided with a limiting plate for limiting the valve disc, an annular groove is provided between the bearing cylinder and the placement table, and the limiting plate is located in the annular groove;

[0020] The other end of the limit rod is provided with a hemispherical head, the outer diameter of the base plate is connected to a swivel through a thread, the upper end of the swivel is provided with guide blocks with the same number as the hemispherical heads, and the inner side of the guide blocks is provided with an inclined surface matching the hemispherical heads;

[0021] When the swivel rotates, the guide block moves the hemispherical head by squeezing the inclined surface, so that the limit plate limits the valve plate. The outer sleeve of the limit rod is provided with a reset spring for resetting the limit plate.

[0022] Preferably, the limiting plate includes a side pressure plate for limiting the outer diameter of the valve disc and an upper pressure plate for limiting the upper end of the valve disc, and the upper pressure plate is located at the upper end of the side pressure plate.

[0023] Preferably, the limiting assembly includes a through hole penetrating the lower horizontal plate, a threaded tube is provided at the bottom of the through hole, a threaded block is connected to the inner diameter of the threaded tube through a thread, and a knob 2 for driving the threaded block to rotate is provided at the bottom of the threaded block;

[0024] A limiting ring is provided at the bottom of the base plate, and two ends of the valve spring are respectively located inside the limiting ring and the threaded tube.

[0025] Preferably, the impact mechanism includes a stand fixed to the middle of the upper end of the upper horizontal plate, and a crankshaft is rotatably mounted on the stand near the inner side of the upper end, and the crankshaft is driven to rotate by a motor;

[0026] A connecting plate is provided at the middle of the upper end of the lifting frame. The connecting plate is movably connected to the crankshaft through a connecting rod, and both ends of the connecting rod are rotationally connected to the connecting plate and the crankshaft respectively.

[0027] Preferably, a second guide column is provided near both ends of the bottom of the lifting frame, and the second guide column is connected to the upper horizontal plate in an up-and-down sliding manner.

[0028] Preferably, the ranging end of the ranging sensor corresponds to the bottom of the base plate.

[0029] Preferably, a notch is provided on the front side of the upper horizontal plate near the position of the supporting frame for facilitating operation.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention limits the outer diameter and upper end of the valve disc by a limiting mechanism, and the valve disc can be limited and released by rotating the swivel, which can facilitate the installation and removal of the valve disc;

[0032] When testing the valve disc, adding a valve disc spring can more accurately simulate the actual working situation of the valve disc. The impact mechanism drives the punch rod to reciprocate and impact the valve disc. After the valve disc is impacted, the valve disc spring causes the carrier and the valve disc to drop a certain distance. This is the action of the valve disc during exhaust, further simulating the actual working state of the valve disc inside the one-way valve.

[0033] The adjustment mechanism can adjust the distance between each punch rod and the valve plate to different distances, so the impact strength of each punch rod on the valve plate is different. Therefore, valve plates of the same model can be compared horizontally, and the specific distance of the punch rod lifting can be adjusted according to the adjustment scale, which is convenient for the staff to operate;

[0034] The shape change of the valve plate can be monitored in real time by the distance measuring sensor, and the impact times of the punch rod can be monitored by the counter. Therefore, multiple sets of detection data can be obtained when the valve plate is inspected, which is convenient for the staff to conduct data analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0036] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0037] Figure 3 It is a front view of the present invention;

[0038] Figure 4 It is a front cross-sectional view of the present invention;

[0039] Figure 5 It is a schematic diagram of the carrier and the limiting mechanism of the present invention;

[0040] Figure 6 For the present invention Figure 5 Cross-sectional view.

[0041] In the figure: 1. Detection frame; 11. Upper horizontal plate; 12. Lower horizontal plate; 13. Clearance; 2. Valve disc; 21. Valve disc spring; 3. Carrying frame; 31. Bottom plate; 32. Guide rod 1; 33. Limit block; 34. Carrying cylinder; 35. Placement table; 4. Limiting mechanism; 41. Limiting rod; 42. Limiting plate; 421. Side pressure plate; 422. Upper pressure plate; 43. Annular groove; 44. Return spring; 45. Hemispherical head; 46. Swivel; 47. Guide block; 48. Inclined surface ;5. Lifting frame;51. Guide column 2;6. Impact mechanism;61. Stand;62. Crankshaft;63. Motor;64. Connecting plate;65. Connecting rod;7. Punch rod;8. Adjusting mechanism;81. Fixing plate;82. Gear;83. Circular rack;84. Knob 1;85. Adjusting scale;86. Triangular indicator block;9. Limiting assembly;91. Threaded tube;92. Threaded block;93. Knob 2;94. Limiting ring;10. Counter;101. Distance sensor. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] See also Figure 1-6 The present invention provides a technical solution: a device for testing the strength of a valve disc of an engine exhaust one-way valve, comprising a testing frame 1, a valve disc 2, and a valve disc spring 21. When the one-way valve is working, the valve disc 2 is reset by the valve disc spring 21. Two horizontal plates are provided in the middle of the testing frame 1, including an upper horizontal plate 11 and a lower horizontal plate 12. The upper horizontal plate 11 is located above the lower horizontal plate 12. A notch 13 is provided on the front of the upper horizontal plate 11 near the bearing frame 3 for easy operation.

[0044] The upper end of the lower horizontal plate 12 is movably connected to a carrier frame 3 for mounting the valve disc 2. The valve disc 2 is fixed to the inner side of the upper end of the carrier frame 3 by a limiting mechanism 4.

[0045] The carrier 3 includes a bottom plate 31, and a plurality of guide rods 32 are provided at the bottom of the bottom plate 31. The guide rods 32 are slidably connected to the lower cross plate 12. The lower ends of the guide rods 32 are provided with limit blocks 33 for limiting the position of the carrier 3. The upper end of the bottom plate 31 is provided with a carrier tube 34, and the interior of the carrier tube 34 is provided with a placement platform 35. The middle part of the placement platform 35 is a hollow structure, and the valve plate 2 is located at the upper end of the placement platform 35.

[0046] The limiting mechanism 4 includes a plurality of limiting rods 41 radially installed around the bearing cylinder 34, and the limiting rods 41 are slidably connected to the bearing cylinder 34, and one end of the limiting rod 41 is provided with a limiting plate 42 for limiting the valve disc 2, and the limiting plate 42 includes a side pressure plate 421 for limiting the outer diameter of the valve disc 2 and an upper pressure plate 422 for limiting the upper end of the valve disc 2. The upper pressure plate 422 is located at the upper end of the side pressure plate 421, and an annular groove 43 is provided between the bearing cylinder 34 and the placing table 35. The limiting plate 42 is located in the annular groove 43, and the other end of the limiting rod 41 is provided with a hemispherical head 45. The outer diameter of the bottom plate 31 is connected to a swivel 46 through a thread, and the upper end of the swivel 46 is provided with a guide block 47 with the same number as the hemispherical head 45, and the inner side of the guide block 47 is provided with an inclined surface 48 matching the hemispherical head 45;

[0047] When the swivel 46 rotates, the guide block 47 squeezes the hemispherical head 45 through the inclined surface 48 to move, so that the limit plate 42 limits the valve plate 2. The limit rod 41 is externally sleeved with a reset spring 44 for resetting the limit plate 42.

[0048] Among them, when testing the valve disc 2, it is necessary to fix the valve disc 2 on the supporting frame 3. First, the valve disc 2 is placed on the upper end of the placement table 35 inside the supporting cylinder 34, and then the valve disc 2 is limited by the limiting mechanism 4. After the valve disc 2 is placed on the upper end of the placement table 35, the swivel 46 is rotated by hand so that the guide block 47 at the upper end of the swivel 46 rotates accordingly, so that the inclined surface 48 on one side of the guide block 47 squeezes the hemispherical head 45, so that the limiting rod 41 and the limiting plate 42 approach the direction of the valve disc 2, so that the side pressure plate 421 limits the outer diameter of the valve disc 2, and the upper pressure plate 422 limits the upper end of the valve disc 2. At this time, the reset spring 44 is compressed. When the inspection is completed, the swivel 46 is rotated in the opposite direction so that the guide block 47 gradually leaves the hemispherical head 45, and the rebound force of the reset spring 44 causes the limiting plate 42 to leave the valve disc 2, so that the valve disc 2 can be taken out.

[0049] The valve spring 21 is located between the carrier 3 and the lower cross plate 12 and is used to reset the carrier 3 and the valve 2. The valve spring 21 is limited by the limiting assembly 9 and the tightness of the valve spring 21 is adjusted.

[0050] The limiting assembly 9 includes a through hole passing through the lower horizontal plate 12, a threaded tube 91 is provided at the bottom of the through hole, the inner diameter of the threaded tube 91 is connected to a threaded block 92 through a thread, and a knob 93 for driving the threaded block 92 to rotate is provided at the bottom of the threaded block 92. A limiting ring 94 is provided at the bottom of the bottom plate 31, and the two ends of the valve plate spring 21 are respectively located inside the limiting ring 94 and the threaded tube 91.

[0051] Among them, the valve plate 2 is used in conjunction with the valve plate spring 21. The valve plate 2 is kept closed by the elastic force of the valve plate spring 21, and is opened when the exhaust pressure overcomes the elastic force of the valve plate spring 21. Therefore, adding the valve plate spring 21 when testing the valve plate 2 can more accurately simulate the actual situation of the valve plate 2 when working. When installing the valve plate spring 21, first rotate the knob 2 93 to remove the threaded block 92, and then insert the valve plate spring 21 into the threaded tube 91 through the bottom of the threaded tube 91, and then rotate the knob 2 93 to install the threaded block 92 at the bottom of the threaded tube 91, and continue to rotate the knob 2 93 to make the threaded block 92 rise until the valve plate spring 21 is located inside the limit ring 94, and the upper end of the valve plate spring 21 abuts against the bottom of the bottom plate 31. By adjusting the height of the threaded block 92 inside the threaded tube 91, the compression strength of the valve plate spring 21 can be adjusted, so that the compression strength of the valve plate spring 21 inside the one-way valve is the same.

[0052] The upper end of the upper horizontal plate 11 is movably connected to a lifting frame 5, on which a plurality of punching rods 7 for punching the valve plate 2 are provided. The lifting frame 5 is controlled by an impact mechanism 6 to move up and down.

[0053] The impact mechanism 6 includes a stand 61 fixed to the middle of the upper end of the upper horizontal plate 11. A crankshaft 62 is rotatably installed on the stand 61 near the inner side of the upper end. The crankshaft 62 is driven to rotate by a motor 63. A connecting plate 64 is provided at the middle of the upper end of the lifting frame 5. The connecting plate 64 is movably connected to the crankshaft 62 through a connecting rod 65, and the two ends of the connecting rod 65 are rotatably connected to the connecting plate 64 and the crankshaft 62 respectively. A guide column 2 51 is provided near both ends of the bottom of the lifting frame 5. The guide column 2 51 is connected to the upper horizontal plate 11 for vertical sliding.

[0054] Among them, after the valve plate 2 and the valve plate spring 21 are installed, the impact mechanism 6 drives the punch rod 7 to reciprocate and impact the valve plate 2 to simulate the actual working state of the valve plate 2. The motor 63 drives the crankshaft 62 to rotate, and the crankshaft 62 and the connecting plate 64 at the upper end of the lifting frame 5 are connected through the connecting rod 65, so that the lifting frame 5 can be lifted and lowered reciprocally, so that the punch rod 7 installed on the lifting frame 5 impacts the valve plate 2. After the valve plate 2 is impacted, the valve plate spring 21 causes the supporting frame 3 and the valve plate 2 to drop a certain distance. This is the action of the valve plate 2 during exhaust, which further simulates the actual working state of the valve plate 2 inside the one-way valve. After the impact of the punch rod 7 is completed, the valve plate spring 21 resets the supporting frame 3 and the valve plate 2 and waits for the next impact of the punch rod 7.

[0055] The distance between the punch rod 7 and the valve plate 2 is adjusted by the adjustment mechanism 8 to adjust the impact strength on the valve plate 2;

[0056] The adjustment mechanism 8 includes a fixed plate 81 located on one side of the upper horizontal plate 11. A gear 82 is rotatably mounted on the fixed plate 81. The gear 82 is controlled to rotate by a knob 84. A round rack 83 is provided on the upper end of the punch 7. The round rack 83 is meshed with the gear 82. A circular adjustment scale 85 is provided on the front of the fixed plate 81. A triangular indicator block 86 matching the adjustment scale 85 is provided on the end face of the knob 84.

[0057] The plunger 7 is raised and lowered by rotating the knob 84, and the specific distance of the plunger 7 raised and lowered can be adjusted according to the adjustment scale 85;

[0058] The calculation formula of the lifting distance L of the punch 7 is: ;

[0059] m is the module of gear 82, z is the number of teeth of gear 82, is the rotation angle of knob 84, , m and z are all known numbers, and L is set as a constant, so the formula can be used to calculate The number obtained Numbers are engraved on the front of the fixing plate 81 , forming an adjustment scale 85 .

[0060] Among them, the adjustment mechanism 8 can be used to adjust the different distances between each punch rod 7 and the valve plate 2, so the impact strength of each punch rod 7 on the valve plate 2 is different, so the valve plates 2 of the same model can be compared horizontally, and the gear 82 is rotated by rotating the knob 84, and the round rack 83 engaged with the gear 82 is used to make the punch rod 7 rise or fall, so that the impact strength of the punch rod 7 can be adjusted, and the specific distance of the rise and fall of the punch rod 7 can be adjusted according to the adjustment scale 85, which can facilitate the operation of the staff.

[0061] A counter 10 for monitoring the number of punching times of the punch rod 7 is provided at the upper end of the upper cross plate 11, and a distance sensor 101 for real-time monitoring of the shape change of the valve plate 2 is provided at the upper end of the lower cross plate 12. The distance measuring end of the distance sensor 101 corresponds to the bottom of the bottom plate 31.

[0062] Among them, the punch rod 7 impacts the valve plate 2 once, and the distance measuring sensor 101 measures the distance of the bottom plate 31 once. After the punch rod 7 impacts the valve plate 2 multiple times, the middle part of the valve plate 2 will be deformed, causing the valve plate 2 to bulge downward. Since the distance the punch rod 7 descends remains unchanged, as the bulge of the valve plate 2 continues to increase, the distance the valve plate 2 descends will gradually decrease, causing the distance the bottom plate 31 descends to gradually decrease. The distance measuring sensor 101 can monitor the descending distance of the bottom plate 31 in real time, so the shape change of the valve plate 2 can be monitored in real time. In addition, the counter 10 can monitor the number of times the lifting frame 5 is lifted and lowered, so the number of impacts of the punch rod 7 can be monitored. Therefore, multiple sets of detection data can be obtained when detecting the valve plate 2, which is convenient for the staff to perform data analysis.

[0063] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the strength of a valve plate of an engine exhaust one-way valve, comprising a detection frame (1), a valve plate (2), and a valve plate spring (21). When the one-way valve is in operation, the valve plate (2) is reset by the valve plate spring (21). The device is characterized in that: The detection frame (1) is provided with two horizontal plates in the middle, including an upper horizontal plate (11) and a lower horizontal plate (12), wherein the upper horizontal plate (11) is located above the lower horizontal plate (12); The upper end of the lower horizontal plate (12) is movably connected to a support frame (3) for mounting the valve plate (2), and the valve plate (2) is fixed to the inner side of the upper end of the support frame (3) via a limiting mechanism (4); The upper end of the upper horizontal plate (11) is movably connected to a lifting frame (5), and the lifting frame (5) is controlled by an impact mechanism (6) to perform reciprocating lifting; The lifting frame (5) is provided with a plurality of punching rods (7) for punching the valve plate (2), and the distance between the punching rods (7) and the valve plate (2) is adjusted by an adjusting mechanism (8) to adjust the impact strength on the valve plate (2); The valve spring (21) is located between the carrier (3) and the lower transverse plate (12) and is used to reset the carrier (3) and the valve (2). The valve spring (21) is limited by the limiting assembly (9) and the tightness of the valve spring (21) is adjusted. A counter (10) for monitoring the number of punching times of the punch rod (7) is provided at the upper end of the upper horizontal plate (11); A distance measuring sensor (101) for real-time monitoring of shape changes of the valve plate (2) is provided at the upper end of the lower transverse plate (12).

2. The engine exhaust check valve plate strength detection device according to claim 1, characterized in that: The adjusting mechanism (8) includes a fixed plate (81) located on one side of the upper horizontal plate (11), a gear (82) is rotatably mounted on the fixed plate (81), and the gear (82) is controlled to rotate by a knob (84). A round rack (83) is provided at the upper end of the punch rod (7), and the round rack (83) is meshed with the gear (82); The front face of the fixed plate (81) is provided with a circular adjustment scale (85), and the end face of the knob (84) is provided with a triangular indicator block (86) that matches the adjustment scale (85); The punch rod (7) is controlled to rise and fall by rotating the knob (84), and the specific distance of the punch rod (7) can be adjusted according to the adjustment scale (85); The calculation formula for the lifting distance L of the punch (7) is: ; Where m is the module of gear (82), z is the number of teeth of gear (82), is the rotation angle of knob 1 (84), , m and z are all known numbers, and L is set as a constant, so the formula can be used to calculate The number obtained Numbers are engraved on the front of the fixed plate (81), forming an adjustment scale (85).

3. The engine exhaust check valve plate strength detection device according to claim 1, characterized in that: The carrier frame (3) includes a bottom plate (31), a plurality of guide rods (32) are provided at the bottom of the bottom plate (31), the guide rods (32) are connected to the lower horizontal plate (12) in an upward and downward sliding manner, and a limit block (33) for limiting the position of the carrier frame (3) is provided at the lower end of the guide rod (32); A supporting cylinder (34) is provided at the upper end of the bottom plate (31), a placement platform (35) is provided inside the supporting cylinder (34), and the middle of the placement platform (35) is a hollow structure, and the valve plate (2) is located at the upper end of the placement platform (35).

4. The engine exhaust check valve plate strength detection device according to claim 3, characterized in that: The limiting mechanism (4) includes a plurality of limiting rods (41) radially mounted around the bearing cylinder (34), and the limiting rods (41) are slidably connected to the bearing cylinder (34), and one end of the limiting rod (41) is provided with a limiting plate (42) for limiting the valve plate (2), and an annular groove (43) is provided between the bearing cylinder (34) and the placement table (35), and the limiting plate (42) is located in the annular groove (43); The other end of the limiting rod (41) is provided with a hemispherical head (45), the outer diameter of the bottom plate (31) is connected to a swivel (46) through a thread, the upper end of the swivel (46) is provided with a guide block (47) with the same number as the hemispherical head (45), and the inner side of the guide block (47) is provided with an inclined surface (48) matching the hemispherical head (45); When the rotating ring (46) rotates, the guide block (47) squeezes the hemispherical head (45) through the inclined surface (48) to move, so that the limiting plate (42) limits the valve plate (2). The limiting rod (41) is externally sleeved with a reset spring (44) for resetting the limiting plate (42).

5. The engine exhaust check valve plate strength detection device according to claim 4, characterized in that: The limiting plate (42) comprises a side pressure plate (421) for limiting the outer diameter of the valve plate (2) and an upper pressure plate (422) for limiting the upper end of the valve plate (2). The upper pressure plate (422) is located at the upper end of the side pressure plate (421).

6. The engine exhaust check valve plate strength detection device according to claim 3, characterized in that: The limiting assembly (9) includes a through hole penetrating the lower horizontal plate (12), a threaded tube (91) is provided at the bottom of the through hole, the inner diameter of the threaded tube (91) is connected to a threaded block (92) through a thread, and a second knob (93) for driving the threaded block (92) to rotate is provided at the bottom of the threaded block (92); A limiting ring (94) is provided at the bottom of the base plate (31), and two ends of the valve plate spring (21) are respectively located inside the limiting ring (94) and the threaded tube (91).

7. The engine exhaust check valve plate strength detection device according to claim 1, characterized in that: The impact mechanism (6) includes a stand (61) fixed to the middle of the upper end of the upper horizontal plate (11), a crankshaft (62) is rotatably mounted on the inner side of the stand (61) near the upper end, and the crankshaft (62) is driven to rotate by a motor (63); A connecting plate (64) is provided in the middle of the upper end of the lifting frame (5). The connecting plate (64) is movably connected to the crankshaft (62) via a connecting rod (65), and both ends of the connecting rod (65) are rotatably connected to the connecting plate (64) and the crankshaft (62).

8. The engine exhaust check valve plate strength detection device according to claim 1, characterized in that: A second guide post (51) is provided near both ends of the bottom of the lifting frame (5), and the second guide post (51) is connected to the upper horizontal plate (11) in an upward and downward sliding manner.

9. The engine exhaust check valve plate strength detection device according to claim 1, characterized in that: The distance measuring end of the distance measuring sensor (101) corresponds to the bottom of the base plate (31).

10. The engine exhaust check valve plate strength detection device according to claim 1, characterized in that: The front of the upper horizontal plate (11) is provided with a clearance notch (13) near the bearing frame (3) for easy operation.

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