Connecting rod feeding and discharging device for connecting rod fatigue strength test

Abstract

The invention relates to a connecting rod feeding and discharging device for a connecting rod fatigue strength test. The connecting rod feeding and discharging device comprises an outer frame, a conveying belt arranged at the bottom of the outer frame, a fixing frame arranged at the top of the outer frame and located above the conveying belt, a first connecting base rotationally connected with the fixing frame, and two angle adjusting assemblies arranged on the two sides of the first connecting base correspondingly. According to the connecting rod clamping device, the abutting clamping assemblies can be accurately positioned and then stretch into a connecting rod large-head hole and a connecting rod small-head hole to abut against and be fixed to the inner wall of the connecting rod large-head hole and the inner wall of the connecting rod small-head hole, so that the connecting rod is stably clamped and fixed; the horizontally conveyed connecting rod is rotated to a vertical placement state, the position of the connecting rod is adjusted through the second telescopic piece, the connecting rod is placed on the connecting rod fatigue experiment device, the connecting rod is continuously conveyed through the conveying belt, batched connecting rod conveying and feeding operation of the connecting rod fatigue experiment is conveniently achieved, and use is convenient and fast.

Description

Technical Field

[0001] The invention belongs to the technical field of connecting rod test auxiliary equipment, and in particular relates to a connecting rod loading and unloading device used for connecting rod fatigue strength test. Background Art

[0002] The connecting rod is the main moving and force-bearing component of a marine engine. It is subjected to reciprocating tensile and compressive alternating loads during operation. This complex force condition makes the fatigue strength of the connecting rod a key factor affecting its performance. Therefore, the connecting rod needs to pass the connecting rod fatigue strength test before it can be put into use.

[0003] In the prior art, when the connecting rod is subjected to fatigue strength test, it is generally necessary to use corresponding auxiliary loading and unloading devices to place it on the connecting rod fatigue test device, and the slide rail system cooperates with the clamp, but there are still many problems when using it, specifically, the loading and unloading accuracy is poor, the degree of automation is low, it is difficult to carry out batch testing, and more manual auxiliary operations are required. In particular, after the fatigue test of the connecting rod is completed, some connecting rods do not meet the quality standards, and the following will occur: Figure 7 The shaft section between the big head hole and the small head hole of the connecting rod shown in the figure is bent and deformed (the end faces of the big head hole and the small head hole are on the same horizontal plane), or the shaft section between the big head hole and the small head hole of the connecting rod is twisted, that is, the end faces of the big head hole and the small head hole of the connecting rod are not on the same horizontal plane, which makes it inconvenient to align the connecting rod and results in poor stability during clamping. Summary of the invention

[0004] The purpose of the present invention is to provide a connecting rod loading and unloading device for connecting rod fatigue strength test in order to solve the above-mentioned problem.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A connecting rod loading and unloading device for connecting rod fatigue strength test, comprising an outer frame, a conveyor belt arranged at the bottom of the outer frame, a fixing frame arranged at the top of the outer frame and located above the conveyor belt, a connecting seat rotatably connected to the fixing frame, two angle adjustment components respectively arranged at both sides of the connecting seat, and a telescopic member 2 connected to the angle adjustment component, wherein the bottoms of the telescopic ends of the two telescopic members 2 are both provided with a pressing clamping component;

[0007] The two pressing and clamping components are respectively extended into the big head hole and the small head hole of the connecting rod to be pressed and fixed on the inner wall of the big head hole and the inner wall of the small head hole of the connecting rod to drive the connecting rod to rotate and move.

[0008] As a further optimization solution of the present invention, the fixing frame is provided with a rotating driving member 1 for driving the connecting seat 1 to rotate;

[0009] The angle adjustment assembly includes a telescopic member 1 arranged on one side of a connecting seat 1, a rotating driving member 2 connected to the telescopic end of the telescopic member 1, a connecting seat 2 connected to the output shaft of the rotating driving member 2, a connecting seat 3 rotatably connected to the connecting seat 2, and a fixed sleeve rotatably connected to the connecting seat 3. The connecting seat 2 is provided with a rotating driving member 3 for driving the connecting seat 3 to rotate, and the connecting seat 3 is provided with a rotating driving member 4 for driving the fixed sleeve to rotate. The rotation directions of the connecting seat 2, the connecting seat 3 and the fixed sleeve are perpendicular to each other in sequence, and the telescopic member 2 is connected to the fixed sleeve.

[0010] As a further optimization scheme of the present invention, the pressing and clamping assembly includes a housing, a fixing plate arranged inside the housing, at least one guide rod arranged on the fixing plate, a bottom plate arranged at one end of the guide rod away from the fixing plate, a screw rod rotatably connected to the fixing plate and the bottom plate, and an outer rotating cylinder rotatably connected to the housing and located outside the screw rod, wherein the screw rod and the outer rotating cylinder are driven to rotate synchronously by a synchronous driving assembly;

[0011] A telescopic detection component is provided outside the outer rotating cylinder, an expansion support component is provided on the bottom plate, and a movable support component is provided on the screw rod for reciprocating along the screw rod to adjust the detection diameter range of the telescopic detection component and adjust the expansion support component to press against the fixed diameter range.

[0012] As a further optimization scheme of the present invention, the telescopic detection assembly includes at least two moving plates evenly distributed outside the outer rotating cylinder, a reversing connecting plate arranged outside the moving plate, a contact plate arranged outside the reversing connecting plate, and an elastic connecting member arranged between the outer rotating cylinder and the moving plate, and at least one pressure sensor for contacting the end surface of the large / small head hole of the connecting rod is arranged at different diameter positions on the contact plate;

[0013] The movable plate comprises a vertical section and an outward expansion section which are connected to each other. The vertical section is arranged close to the outer shell, and the outward expansion section is arranged close to the expansion support assembly.

[0014] As a further optimization scheme of the present invention, the elastic connecting member includes a connecting rod arranged on the outer wall of the outer rotating cylinder and passing through the movable plate, a spring arranged between the outer rotating cylinder and the movable plate and sleeved on the outside of the connecting rod, and the movable plate is slidably connected to the connecting rod.

[0015] As a further optimization scheme of the present invention, the expansion support assembly includes an expansion support seat arranged on the base plate and a plurality of pressure plates connected to the expansion support seat. The expansion support seat is composed of a plurality of elastic support plates arranged to be inclined outward. One ends of the elastic support plates are connected and fixed to the base plate in sequence, and gaps are left between the other ends. The pressure plates are connected to the elastic support plates one by one.

[0016] As a further optimization scheme of the present invention, the movable support assembly includes a nut seat connected to the screw rod and a movable support block arranged outside the nut seat, the movable support block extends outward to form a plurality of pressing parts, the inner wall of the movable plate contacts the pressing parts, the pressing parts correspond one-to-one with the elastic support plate, and a rolling shaft is rotatably connected to the pressing parts.

[0017] As a further optimization scheme of the present invention, the synchronous drive assembly includes a servo motor arranged inside the outer shell and connected to the screw, an auxiliary shaft rotatably connected inside the outer shell, a synchronizing member arranged between the screw and the auxiliary shaft, and two gears respectively arranged on the outside of the outer rotating cylinder and the auxiliary shaft and meshing with each other.

[0018] As a further optimization solution of the present invention, a raised seat for supporting the middle position of the connecting rod is placed on the conveyor belt.

[0019] The beneficial effects of the present invention are:

[0020] 1) The present invention can accurately position the pressing and clamping assembly and respectively extend into the large end hole and the small end hole of the connecting rod to press and fix the connecting rod on the inner wall of the large end hole and the inner wall of the small end hole, so as to stably clamp and fix the connecting rod. The pressing and clamping assembly holding the connecting rod can be driven to rotate by rotating the driving member to drive the connecting seat, so as to rotate the horizontally transported connecting rod to a vertically placed state, and then adjust the position of the connecting rod by the telescopic member to place the connecting rod on the connecting rod fatigue test device, and continuously transport the connecting rod by the conveyor belt, so as to realize the batch connecting rod conveying and feeding operation of the connecting rod fatigue test, and is convenient to use;

[0021] 2) The present invention can detect whether the pressure plate is parallel to the inner wall of the large / small head hole of the connecting rod, and whether the expansion support seat and the pressure plate are located at the center position of the large / small head hole of the connecting rod through the telescopic detection component, so as to cooperate with the angle adjustment component to adjust the position of the expansion support seat and the pressure plate until the pressure plate is parallel to the inner wall of the large / small head hole of the connecting rod and the expansion support seat and the pressure plate are located at the center position of the large / small head hole of the connecting rod, and then expand and expand the diameter of the pressure fixation, so that the pressure plate can be stably pressed against the inner wall of the large / small head hole of the connecting rod, thereby achieving the function of clamping and fixing the connecting rod, and facilitating the removal and transportation of the bent and twisted connecting rod after the connecting rod fatigue test.

[0022] 3) During the loading and unloading operation of the connecting rod, the present invention can automatically and accurately position the connecting rod and then clamp and fix the connecting rod, with good clamping stability and easy use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention (the pressing and clamping assembly is in a horizontal placement state).

[0024] Figure 2It is a schematic diagram of the overall structure of the present invention (the pressing and clamping assembly is in a vertically placed state).

[0025] Figure 3 The present invention Figure 1 Schematic diagram of part of the structure.

[0026] Figure 4 The present invention Figure 3 Schematic diagram of part of the structure.

[0027] Figure 5 It is a top view of the expansion support seat and the pressure plate (located inside the hole of the small end of the connecting rod) of the present invention.

[0028] Figure 6 It is a top view of the movable support block and the rolling shaft of the present invention.

[0029] Figure 7 It is a schematic diagram of the connecting rod of the present invention in a normal state and a schematic diagram of the connecting rod in which the shaft section between the large / small head holes of the connecting rod is bent and deformed.

[0030] In the figure: 1. outer frame; 2. conveyor belt; 3. pad seat; 4. fixed frame; 5. connecting seat one; 51. telescopic member one; 6. rotating drive member one; 7. rotating drive member two; 8. connecting seat two; 91. connecting seat three; 92. rotating drive member three; 93. fixed sleeve; 10. rotating drive member four; 11. telescopic member two; 12. outer shell; 13. fixed plate; 14. guide rod; 15. bottom plate; 16. screw rod; 17. outer rotating cylinder; 18. connecting rod; 19. moving plate; 20. spring; 21. reversing connecting plate; 22. contact plate; 23. pressure sensor; 24. nut seat; 25. moving support block; 26. rolling shaft; 27. expansion support seat; 28. pressure plate; 29. ​​servo motor; 30. auxiliary shaft; 31. synchronous member; 32. gear. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0032] like Figure 1-6 As shown, a connecting rod loading and unloading device for connecting rod fatigue strength test comprises an outer frame 1, a conveyor belt 2 arranged at the bottom of the outer frame 1, a fixing frame 4 arranged at the top of the outer frame 1 and located above the conveyor belt 2, a connecting seat 1 5 rotatably connected to the fixing frame 4, two angle adjustment components respectively arranged at both sides of the connecting seat 1 5, and a telescopic member 2 11 connected to the angle adjustment component, and the bottom of the telescopic ends of the two telescopic members 2 11 are provided with a pressing clamping component;

[0033] The two pressing and clamping components are respectively extended into the big head hole and the small head hole of the connecting rod to be pressed and fixed on the inner wall of the big head hole and the inner wall of the small head hole of the connecting rod to drive the connecting rod to rotate and move.

[0034] Preferably, the fixing frame 4 is provided with a rotating driving member 6 for driving the connecting seat 5 to rotate;

[0035] The angle adjustment assembly includes a telescopic member 51 arranged on one side of a connecting seat 5, a rotating driving member 27 connected to the telescopic end of the telescopic member 51, a connecting seat 28 connected to the output shaft of the rotating driving member 27, a connecting seat 3 91 rotatably connected to the connecting seat 28, and a fixed sleeve 93 rotatably connected to the connecting seat 3 91. The connecting seat 28 is provided with a rotating driving member 3 92 for driving the connecting seat 3 91 to rotate, and the connecting seat 3 91 is provided with a rotating driving member 4 10 for driving the fixed sleeve 93 to rotate. The rotation directions of the connecting seat 28, the connecting seat 3 91, and the fixed sleeve 93 are perpendicular to each other in sequence, and the telescopic member 2 11 is connected to the fixed sleeve 93.

[0036] It should be noted that, in this embodiment, the rotating drive member 1 6, the rotating drive member 2 7, the rotating drive member 3 92, and the rotating drive member 4 10 are any one of a rotating oil cylinder or a rotating motor;

[0037] The telescopic member 1 51 and the telescopic member 2 11 are telescopic oil cylinders.

[0038] The present invention drives the connecting seat 5 to rotate by rotating the driving member 6, so that the two pressing and clamping components can be moved from Figure 1 The status shown turns to Figure 2 The state shown, that is, the connecting rod clamped and fixed horizontally placed on the top of the conveyor belt 2 can be rotated to a vertical placement state, and then the position of the connecting rod is adjusted by the telescopic member 11, so that the connecting rod is placed on the large head hole fixture and the small head hole fixture of the connecting rod fatigue test device.

[0039] Preferably, the pressing and clamping assembly comprises a housing 12, a fixing plate 13 disposed inside the housing 12, at least one guide rod 14 disposed on the fixing plate 13, a bottom plate 15 disposed at one end of the guide rod 14 away from the fixing plate 13, a screw rod 16 rotatably connected to the fixing plate 13 and the bottom plate 15, and an outer rotating cylinder 17 rotatably connected to the housing 12 and located outside the screw rod 16, wherein the screw rod 16 and the outer rotating cylinder 17 are driven to rotate synchronously by a synchronous driving assembly;

[0040] The outer rotating cylinder 17 is provided with a telescopic detection component outside, the bottom plate 15 is provided with an expansion support component, and the screw rod 16 is provided with a movable support component that moves back and forth along the screw rod 16 to adjust the detection diameter range of the telescopic detection component and adjust the expansion support component to press against the fixed diameter range.

[0041] Preferably, the telescopic detection assembly includes at least two moving plates 19 evenly distributed outside the outer rotating cylinder 17, a reversing connecting plate 21 arranged outside the moving plate 19, a contact plate 22 arranged outside the reversing connecting plate 21, and an elastic connecting member arranged between the outer rotating cylinder 17 and the moving plate 19, and at least one pressure sensor 23 for contacting the end surface of the large / small head hole of the connecting rod is arranged at different diameter positions on the contact plate 22;

[0042] The movable plate 19 includes a vertical section and an outward expansion section which are connected to each other. The vertical section is arranged close to the outer shell 12, and the outward expansion section is arranged close to the expansion support assembly.

[0043] It should be noted that in the present application, the number of movable plates 19 is two, and in other embodiments, the number of movable plates 19 may be other numbers. A pressure sensor 23 is correspondingly provided at the corresponding diameter position on each movable plate 19. Taking the present application as an example, the number of movable plates 19 is two, that is, the number of pressure sensors 23 at the same diameter position is also two.

[0044] Preferably, the elastic connecting member includes a connecting rod 18 provided on the outer wall of the outer rotating cylinder 17 and passing through the movable plate 19, and a spring 20 provided between the outer rotating cylinder 17 and the movable plate 19 and sleeved on the outside of the connecting rod 18, and the movable plate 19 is slidably connected to the connecting rod 18.

[0045] Preferably, the expansion support assembly includes an expansion support seat 27 arranged on the base plate 15, and a plurality of pressure plates 28 connected to the expansion support seat 27. The expansion support seat 27 is composed of a plurality of elastic support plates arranged to be inclined outward, one end of the elastic support plates are connected and fixed to the base plate 15 in sequence, and a gap is left between the other ends. The pressure plates 28 are connected to the elastic support plates one by one.

[0046] Preferably, the movable support assembly includes a nut seat 24 connected to the screw rod 16 through a ball nut pair, and a movable support block 25 arranged outside the nut seat 24, the movable support block 25 extends outward to form a plurality of pressing parts, the inner wall of the movable plate 19 is in contact with the pressing parts, the pressing parts correspond one-to-one with the elastic support plates, and the pressing parts are rotatably connected to a rolling shaft 26.

[0047] It should be noted that, in the application, the guide rod 14 passes through the movable support block 25 to limit the movement of the movable support block 25 .

[0048] Preferably, the synchronous drive assembly includes a servo motor 29 disposed inside the housing 12 and connected to the screw 16, an auxiliary shaft 30 rotatably connected to the inside of the housing 12, a synchronization member 31 disposed between the screw 16 and the auxiliary shaft 30, and two gears 32 respectively disposed on the outside of the outer rotating cylinder 17 and the auxiliary shaft 30 and meshing with each other.

[0049] It should be noted that, in this embodiment, the synchronous member 31 includes two synchronous wheels respectively arranged on the screw rod 16 and the auxiliary shaft 30 and a synchronous belt arranged between the two synchronous wheels.

[0050] After the connecting rod fatigue test, the shaft section between the large head hole and the small head hole of the connecting rod is bent and deformed ( Figure 7 As shown in the figure, the end faces of the big head hole and the small head hole of the connecting rod are on the same horizontal plane), especially the axial section between the big head hole and the small head hole of the connecting rod is twisted and deformed (the end faces of the big head hole and the small head hole of the connecting rod are not on the same horizontal plane), then the pressing and clamping assembly needs to be repositioned at the center position of the big / small head hole of the connecting rod before it can be pressed and fixed on the inner wall of the big / small head hole of the connecting rod to drive the connecting rod to rotate and move, that is, to remove and transport the connecting rod from the connecting rod fatigue test equipment. At this time, it is necessary to adjust the angular position of the pressing and clamping assembly. The present invention can drive the connecting seat 2 8 to rotate by rotating the driving member 2 7, and The rotating driving member three 92 drives the connecting seat three 91 to rotate, and the rotating driving member four 10 can drive the fixing sleeve 93 to rotate, thereby realizing angle adjustment in three different dimensions, and the telescopic member one 51 can drive the rotating driving member two 7 and the parts connected to the rotating driving member two 7 to telescope to adjust the position, and the telescopic member two 11 can also drive the outer shell 12 and the parts connected to the outer shell 12 to telescope to adjust the position, thereby realizing adjustment of different angles and different positions in three-dimensional space, thereby facilitating the expansion support seat 27 and the pressure plate 28 to extend to the inside of the large / small head hole of the connecting rod after bending or twisting.

[0051] The present invention drives the screw 16 to rotate by the rotation of the servo motor 29. When the screw 16 rotates, the nut seat 24 drives the mobile support block 25 to reciprocate along the screw 16. The screw 16 rotates to drive the synchronous member 31 to transmit, thereby driving the auxiliary shaft 30 to rotate. The auxiliary shaft 30 rotates and drives the outer rotating cylinder 17 to rotate through the mutually meshing gears 32. The rotation of the outer rotating cylinder 17 can drive the connecting rod 18, the moving plate 19, the spring 20, the reversing connecting plate 21, the contact plate 22 and the plurality of pressure sensors 23 on the contact plate 22 connected thereto to rotate together. The pressure sensor 23 is rotated to detect whether the contact plate 22 fits with the end surface of the large / small head hole of the connecting rod, that is, whether the force of the pressure sensor 23 at different positions is consistent. If they are consistent, it means that the contact plate 22 fits with the end surface of the large / small head hole of the connecting rod, and the pressing plate 28 can be parallel to the inner wall of the large / small head hole of the connecting rod. If they are inconsistent, it means that the contact plate 22 does not fit with the end surface of the large / small head hole of the connecting rod. Then, the position of the connecting rod of the housing 12 and the angle of the pressing clamping assembly can be adjusted by the telescopic member 11, and the above detection steps can be repeated by telescopic detection assembly.

[0052] When the mobile support block 25 gradually moves to the expansion section of the mobile plate 19, the mobile plate 19 will gradually approach the outer rotating cylinder 17 under the elastic force of the spring 20, and the reversing connecting plate 21 and the contact plate 22 will move together with the mobile plate 19, thereby reducing the detection diameter range of the telescopic detection component. Then, the pressure sensor 23 close to the reversing connecting plate 21 moves to the position of the large / small head hole of the connecting rod. Without the support of the end face, no pressure can be detected. At this time, it can be determined whether the pressure values ​​detected by the two pressure sensors 23 at the same diameter position on the two contact plates 22 are the same. If the pressure is not reached, it means that the bottom plate 15, the expansion support seat 27, and the pressure plate 28 are not located at the center of the large / small head hole of the connecting rod, then continue to adjust the angle of the pressure clamping assembly, and repeat the above detection steps through the telescopic detection assembly. If the pressure is reached, it means that the bottom plate 15, the expansion support seat 27, and the pressure plate 28 are located at the center of the large / small head hole of the connecting rod, then move the movable support block 25 to the position of the expansion support seat 27, and use the movable support block 25 to press and expand the expansion support seat 27, thereby expanding the diameter of the pressure fixation, and then press the pressure plate 28 against the inner wall of the large / small head hole of the connecting rod;

[0053] When the two pressing and clamping components are respectively extended into the large end hole and the small end hole of the connecting rod and pressed and fixed on the inner wall of the large end hole and the small end hole of the connecting rod, the position of the outer shell 12 and the parts connected to the outer shell 12 can be adjusted by the telescopic part 11, and the connecting rod can be removed from the connecting rod fatigue test device. Then, the connecting seat 5 is driven by the rotating driving part 6 to drive the connecting rod to rotate, and the connecting rod is rotated from the vertical placement state to the horizontal placement state, and then placed on the raising seat 3 and transported away by the conveyor belt 2.

[0054] Preferably, a raised seat 3 for supporting the middle position of the connecting rod is placed on the conveyor belt 2, which is used to raise the raised seat 3 so that the lower end surfaces of the large head hole and the small head hole of the connecting rod are kept at a certain distance from the top of the conveyor belt 2, so as to facilitate the connecting rod to Figure 1 and 2 As shown, when placed flat on the top of the conveyor belt 2 for transportation, the bottom plate 15, the expansion support seat 27 and the pressing plate 28 of the pressing clamping assembly can extend into the large end hole and the small end hole of the connecting rod and press and fix on the inner wall of the large end hole and the small end hole of the connecting rod.

[0055] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A connecting rod loading and unloading device for connecting rod fatigue strength test, characterized in that: The invention comprises an outer frame (1), a conveyor belt (2) arranged at the bottom of the outer frame (1), a fixing frame (4) arranged at the top of the outer frame (1) and located above the conveyor belt (2), a connecting seat (5) rotatably connected to the fixing frame (4), two angle adjustment components respectively arranged at both sides of the connecting seat (5), and a telescopic member (11) connected to the angle adjustment component, wherein the bottoms of the telescopic ends of the two telescopic members (11) are both provided with a pressing clamping component; The two pressing and clamping components are respectively extended into the big head hole and the small head hole of the connecting rod to be pressed and fixed on the inner wall of the big head hole and the inner wall of the small head hole of the connecting rod to drive the connecting rod to rotate and move.

2. A connecting rod loading and unloading device for connecting rod fatigue strength test according to claim 1, characterized in that: The fixing frame (4) is provided with a rotating driving member (6) for driving the connecting seat (5) to rotate; The angle adjustment assembly comprises a telescopic member 1 (51) arranged on one side of a connecting seat 1 (5), a rotating driving member 2 (7) connected to the telescopic end of the telescopic member 1 (51), a connecting seat 2 (8) connected to the output shaft of the rotating driving member 2 (7), a connecting seat 3 (91) rotatably connected to the connecting seat 2 (8), and a fixing sleeve (93) rotatably connected to the connecting seat 3 (91); the connecting seat 2 (8) is provided with a rotating driving member 3 (92) for driving the connecting seat 3 (91) to rotate; the connecting seat 3 (91) is provided with a rotating driving member 4 (10) for driving the fixing sleeve (93) to rotate; the connecting seat 2 (8), the connecting seat 3 (91) and the fixing sleeve (93) have rotation directions that are perpendicular to each other; and the telescopic member 2 (11) is connected to the fixing sleeve (93).

3. The connecting rod loading and unloading device for connecting rod fatigue strength test according to claim 1, characterized in that: The pressing and clamping assembly comprises a housing (12), a fixing plate (13) arranged inside the housing (12), at least one guide rod (14) arranged on the fixing plate (13), a bottom plate (15) arranged at one end of the guide rod (14) away from the fixing plate (13), a screw rod (16) rotatably connected to the fixing plate (13) and the bottom plate (15), and an outer rotating cylinder (17) rotatably connected to the housing (12) and located outside the screw rod (16), wherein the screw rod (16) and the outer rotating cylinder (17) are driven to rotate synchronously by a synchronous driving assembly; The outer rotating cylinder (17) is provided with a telescopic detection component on the outside, the bottom plate (15) is provided with an expansion support component, and the screw rod (16) is provided with a movable support component which moves back and forth along the screw rod (16) to adjust the detection diameter range of the telescopic detection component and adjust the pressure of the expansion support component against the fixed diameter range.

4. A connecting rod loading and unloading device for connecting rod fatigue strength test according to claim 3, characterized in that: The telescopic detection assembly comprises at least two moving plates (19) evenly distributed outside the outer rotating cylinder (17), a reversing connecting plate (21) arranged outside the moving plate (19), a contact plate (22) arranged outside the reversing connecting plate (21), and an elastic connecting member arranged between the outer rotating cylinder (17) and the moving plate (19), wherein the contact plate (22) is provided with at least one pressure sensor (23) at different diameter positions for contacting the end surface of the large / small head hole of the connecting rod; The movable plate (19) comprises a vertical section and an outward expansion section which are connected to each other, wherein the vertical section is arranged close to the outer shell (12) and the outward expansion section is arranged close to the expansion support assembly.

5. The connecting rod loading and unloading device for connecting rod fatigue strength test according to claim 4, characterized in that: The expansion support assembly comprises an expansion support seat (27) arranged on the bottom plate (15), and a plurality of pressure plates (28) connected to the expansion support seat (27); the expansion support seat (27) is composed of a plurality of elastic support plates arranged to be inclined outward, one end of the elastic support plates is sequentially connected and fixed to the bottom plate (15), and a gap is left between the other ends; the pressure plates (28) are connected to the elastic support plates in a one-to-one correspondence.

6. A connecting rod loading and unloading device for connecting rod fatigue strength test according to claim 5, characterized in that: The movable support assembly comprises a nut seat (24) matched with the screw rod (16), and a movable support block (25) arranged outside the nut seat (24); the movable support block (25) extends outward to form a plurality of pressing parts; the inner wall of the movable plate (19) contacts the pressing parts; the pressing parts correspond to the elastic support plates one by one; and a rolling shaft (26) is rotatably connected to the pressing parts.

7. The connecting rod loading and unloading device for connecting rod fatigue strength test according to claim 1, characterized in that: A raised seat (3) for supporting the middle position of the connecting rod is placed on the conveyor belt (2).

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