A crankshaft vibration testing device

Abstract

The present application discloses a crankshaft vibration test device, which belongs to the field of crankshaft vibration test. The crankshaft vibration test device includes a base and a top cover. The base is connected to the top cover through a first bracket. The top of the base and the bottom of the top cover are both arc-shaped groove structures, and elastic limit components are provided inside the base and the top cover. A detection component is movably assembled between the base and the top cover through the elastic limit component. The detection component includes: a connecting seat component movably connected in the base and the top cover and supported by multiple elastic limit components. The present application performs vibration detection on the crankshaft by setting a detection component. Through two connecting seat components movably connected in the top cover and the base, respectively, the detection component can be movable in the radial area of ​​the crankshaft. A flexible connection method is used to perform vibration detection on the crankshaft, so that the radial vibration of the crankshaft can be truly transmitted to the vibration sensor, thereby improving the authenticity of the detection result.

Description

Technical Field

[0001] The present application relates to the field of crankshaft vibration testing, and in particular, to a crankshaft vibration testing device. Background Art

[0002] The crankshaft is an important part of the engine, generally composed of the main journal, connecting rod journal, crank, balance block, etc. The balance block is used to balance the centrifugal force and centrifugal torque of the crankshaft. Its material is made of carbon structural steel or ductile iron. After casting, the main journal and connecting rod journal need to be turned using a precision lathe. Because the crankshaft is subjected to gas pressure, inertia force and inertia moment when working, the force is large and complex, and it is subjected to the impact of alternating loads. At the same time, the crankshaft is a high-speed rotating part. Therefore, the crankshaft is required to have sufficient rigidity and strength, good ability to withstand impact loads, wear resistance and good lubrication.

[0003] The existing dynamic balancing test instrument directly and rigidly fixes the crankshaft, and the axial and radial movements of the crankshaft are restricted. Therefore, part of the centrifugal force generated by the crankshaft is absorbed by the frame of the instrument, and the centrifugal force data measured by the vibration sensor has a large error. Summary of the invention

[0004] The present invention solves the problem that the prior art dynamic balancing test instrument directly and rigidly fixes the crankshaft, and the axial and radial directions of the crankshaft are restricted from moving. Therefore, part of the centrifugal force generated by the crankshaft is absorbed by the frame of the instrument, and the centrifugal force data measured by the vibration sensor has a large error. To this end, the present invention proposes a crankshaft vibration test device, which can prevent the centrifugal force generated by the crankshaft from being absorbed by the device when the crankshaft rotates.

[0005] To achieve the above-mentioned object, the present application provides a crankshaft vibration testing device, comprising a base and a top cover, wherein the base is connected to the top cover via a first bracket;

[0006] The top of the base and the bottom of the top cover are both arc-shaped groove structures, and elastic limit components are provided inside the base and the top cover. A detection component is movably assembled between the base and the top cover through the elastic limit component, and the detection component includes:

[0007] A connecting seat assembly movably connected in the base and the top cover and supported by a plurality of elastic limiting assemblies;

[0008] A motor and a gear box are fixed on the connecting seat assembly at the bottom, one output end of the gear box is connected to the output end of the motor, and a first shaft fixture is fixed on the other output end of the gear box;

[0009] An adjustable bracket assembly is mounted on the side of the first shaft body fixture, and a second shaft body fixture is fixed to one end of the adjustable bracket assembly away from the first shaft body fixture;

[0010] A vibration detection device mounted inside the adjustable bracket assembly.

[0011] Preferably, the elastic limiting assembly includes an elastic telescopic rod hinged on the inner wall of the base or the top cover, a first ball sleeve is fixed to the front end of the elastic telescopic rod, and a first positioning ball is rotatably connected in the first ball sleeve. The first ball sleeve can make the first positioning ball contact and connect with the connecting seat assembly at multiple angles.

[0012] Preferably, the connection seat assembly includes a connection plate, a second ball sleeve is fixed on the connection plate, a second positioning ball is rotatably connected in the second ball sleeve, and a first annular groove is provided on the outside of the second ball sleeve. The second positioning ball can make the connection seat assembly at the top slide in the top cover at multiple angles, and make the connection seat assembly at the bottom slide in the base at multiple angles.

[0013] Preferably, the first annular groove on the second ball sleeve is compatible with the specifications of the first positioning ball in the elastic limiting assembly, and the first positioning ball is slidably connected in the first annular groove. By connecting the first positioning balls in multiple elastic limiting assemblies with the first annular groove, a supporting effect can be formed on the second ball sleeve, and at the same time, the multi-angle sliding state of the two connecting seat assemblies will not be affected.

[0014] Preferably, the adjustable bracket assembly includes a second bracket fixed to the side of the first shaft body clamp, a positioning rod is fixed to the top of the second bracket, a third bracket is penetrated and slidably sleeved on the outside of the positioning rod, the side of the third bracket is fixed to the second shaft body clamp, and the outer side of the second bracket is rotatably connected to a threaded rod through a bearing, and the threaded rod is threadedly connected to the third bracket. The rise and fall of the third bracket is controlled by rotating the threaded rod, and at the same time, the movement trajectory of the third bracket is limited by the positioning rod, so that the third bracket is in a straight up and down movement state, thereby controlling the distance between the second shaft body clamp and the first shaft body clamp, and facilitating the installation and removal of the crankshaft.

[0015] Preferably, a support rod is fixed at the bottom of the second bracket, a friction ball is rotatably connected to the bottom of the support rod, a second annular groove is provided at the top of the gear box, and the friction ball is rotatably connected in the second annular groove. The support rod plays an auxiliary supporting role on the second bracket, and the friction ball can reduce the friction loss between the support rod and the gear box. At the same time, the second annular groove helps to limit the movement trajectory of the support rod.

[0016] Preferably, the vibration detection device comprises a first clamping rod and a second clamping rod hinged on the side of the second bracket or the third bracket, a spring is installed between the first clamping rod and the second clamping rod, and a vibration sensor is embedded in the first clamping rod and the second clamping rod. The front sections of the first clamping rod and the second clamping rod are arc-shaped structures, and after merging, they form an annular structure, so that the vibration sensors on the first clamping rod and the second clamping rod can fit the shaft body of the crankshaft, achieving a better detection effect.

[0017] Preferably, the outer side of the second shaft body fixture is equipped with a protective component, and the protective component includes a special-shaped pipe, and an accordion-type hollow elastic capsule is fixed at the bottom of the special-shaped pipe. Due to its special accordion-type shape, the accordion-type hollow elastic capsule can only expand and deform vertically downward. A plurality of hollow blocks are fixed inside the special-shaped pipe, and a slider is slidably connected inside each of the hollow blocks, and a liquid storage capsule body connected to the special-shaped pipe is fixed inside each of the hollow blocks. Since the protective component is assembled on the second shaft body fixture, a certain centrifugal force will be generated during the detection process. At this time, under the action of the centrifugal force, the sliders in the plurality of hollow blocks will slide toward the surroundings in an open manner, thereby squeezing a plurality of liquid storage capsule bodies at the same time, squeezing the liquid inside them into the special-shaped pipe, and then entering the accordion-type hollow elastic capsule, so that the accordion-type hollow elastic capsule expands downward, partially shielding the detection component, and preventing external interference from affecting the detection results.

[0018] Preferably, the bottom of the accordion-type hollow elastic bag is equipped with a plurality of balancing balls connected by elastic ropes. The arrangement of the balancing balls can provide a balancing effect to the protective component when it follows the rotation, and prevent it from swinging.

[0019] The benefits of this application are:

[0020] (1) The present application performs vibration detection on the crankshaft by setting up a detection component. Through two connecting seat components that are movably connected to the top cover and the base respectively, the detection component can move in the radial area of ​​the crankshaft. A flexible connection method is used to detect the vibration of the crankshaft, so that the radial vibration of the crankshaft can be truly transmitted to the vibration sensor, thereby improving the authenticity of the detection result.

[0021] (2) The present application sets a protective component. Under the action of centrifugal force, the sliders in the multiple hollow blocks will slide in all directions in an open manner, thereby squeezing multiple liquid storage bags at the same time, squeezing the liquid inside into the special-shaped pipe, and then into the accordion-type hollow elastic bag, causing the accordion-type hollow elastic bag to expand downward, partially blocking the detection component, thereby preventing external interference from affecting the detection results.

[0022] (3) In the present application, the front sections of the first clamping rod and the second clamping rod are arc-shaped structures, which form a ring structure after being combined, so that the vibration sensors on the first clamping rod and the second clamping rod can fit the shaft body of the crankshaft, thereby achieving a better detection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention as a whole;

[0025] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0026] Figure 3 It is a schematic diagram of a part of the structure of the present invention;

[0027] Figure 4 It is a schematic diagram of the connection structure of the base and the top cover of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the elastic limiting assembly of the present invention;

[0029] Figure 6 It is a schematic diagram of the structure of the detection component of the present invention;

[0030] Figure 7 It is a structural schematic diagram of the connecting seat assembly of the present invention;

[0031] Figure 8 is a schematic structural diagram of an adjustable bracket assembly of the present invention;

[0032] Fig. 9 It is a structural schematic diagram of the vibration detection device of the present invention;

[0033] Fig.10 It is a schematic diagram of the structure of the protection component of the present invention;

[0034] Fig.11 It is a position relationship diagram of the accordion-type hollow elastic sac and the balancing ball at its bottom of the present invention.

[0035] In the above figure,

[0036] 100, base; 200, first bracket; 300, top cover;

[0037] 400, elastic limiting assembly; 410, elastic telescopic rod; 420, first ball sleeve; 430, first positioning ball;

[0038] 500, detection component;

[0039] 510, connecting seat assembly; 511, connecting plate; 512, second ball sleeve; 513, second positioning ball; 514, first annular groove;

[0040] 520, gear box; 521, second annular groove;

[0041] 530, motor; 540, first shaft fixture; 560, second shaft fixture;

[0042] 550, adjustable bracket assembly; 551, second bracket; 552, support rod; 553, friction ball; 554, positioning rod; 555, third bracket; 556, threaded rod;

[0043] 570, vibration detection device; 571, first clamping rod; 572, second clamping rod; 573, spring; 574, vibration sensor;

[0044] 600, protective component; 610, special-shaped pipe; 620, accordion-type hollow elastic bag; 630, hollow block; 640, liquid storage bag body; 650, sliding block; 660, balancing ball. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application are described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, the process, method, system, product or equipment comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0047] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0048] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0049] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0051] Example 1

[0052] See also Figure 1-Figure 9 , this embodiment provides a crankshaft vibration testing device, including a base 100 and a top cover 300, wherein the base 100 is connected to the top cover 300 through a first bracket 200;

[0053] The top of the base 100 and the bottom of the top cover 300 are both arc-shaped groove structures, and elastic limiting components 400 are provided inside the base 100 and the top cover 300. A detection component 500 is movably assembled between the base 100 and the top cover 300 through the elastic limiting component 400. The detection component 500 includes:

[0054] A connecting seat assembly 510 movably connected within the base 100 and the top cover 300 and supported by a plurality of elastic limiting assemblies 400;

[0055] The elastic limiting assembly 400 includes an elastic telescopic rod 410 hinged on the inner wall of the base 100 or the top cover 300, a first ball sleeve 420 is fixed to the front end of the elastic telescopic rod 410, a first positioning ball 430 is rotatably connected in the first ball sleeve 420, the connecting seat assembly 510 includes a connecting plate 511, a second ball sleeve 512 is fixed to the connecting plate 511, a second positioning ball 513 is rotatably connected in the second ball sleeve 512, a first annular groove 514 is provided on the outside of the second ball sleeve 512, the setting of the first ball sleeve 420 enables the first positioning ball 430 to contact and connect with the connecting seat assembly 510 at multiple angles, and the second The arrangement of the two positioning balls 513 can make the top connection seat assembly 510 slide at multiple angles in the top cover 300, and the bottom connection seat assembly 510 slide at multiple angles in the base 100. The first annular groove 514 provided on the second ball sleeve 512 is adapted to the specifications of the first positioning ball 430 in the elastic limiting assembly 400, and the first positioning ball 430 is slidably connected in the first annular groove 514. By connecting the first positioning balls 430 in the multiple elastic limiting assemblies 400 with the first annular groove 514, a supporting effect can be formed on the second ball sleeve 512, and at the same time, the multi-angle sliding state of the two connection seat assemblies 510 will not be affected.

[0056] A motor 530 and a gear box 520 are fixed to the bottom connecting seat assembly 510. One output end of the gear box 520 is connected to the output end of the motor 530. A first shaft fixture 540 is fixed to the other output end of the gear box 520.

[0057] An adjustable bracket assembly 550 is assembled on the side of the first shaft body clamp 540, and a second shaft body clamp 560 is fixed to one end of the adjustable bracket assembly 550 away from the first shaft body clamp 540. The adjustable bracket assembly 550 includes a second bracket 551 fixed to the side of the first shaft body clamp 540, a positioning rod 554 is fixed to the top of the second bracket 551, and a third bracket 555 is penetrated and slidably sleeved on the outside of the positioning rod 554, and the side of the third bracket 555 is fixed to the second shaft body clamp 560, and a threaded rod 556 is rotatably connected to the outer side of the second bracket 551 through a bearing, and the threaded rod 556 is threadedly connected to the third bracket 555. The rise and fall of the third bracket 555 are controlled by rotating the threaded rod 556. At the same time, the movement trajectory of the third bracket 555 is limited by the positioning rod 554, so that the third bracket 555 is in a straight up and down movement state, thereby controlling the distance between the second shaft body clamp 560 and the first shaft body clamp 540, and facilitating the installation and removal of the crankshaft;

[0058] A support rod 552 is fixed at the bottom of the second bracket 551, and a friction ball 553 is rotatably connected to the bottom of the support rod 552. A second annular groove 521 is provided at the top of the gear box 520, and the friction ball 553 is rotatably connected in the second annular groove 521. The support rod 552 plays an auxiliary supporting effect on the second bracket 551. At the same time, the setting of the friction ball 553 can reduce the friction loss between the support rod 552 and the gear box 520. At the same time, the opening of the second annular groove 521 helps to limit the movement trajectory of the support rod 552.

[0059] The vibration detection device 570 is assembled on the inner side of the adjustable bracket assembly 550, and the vibration detection device 570 includes a first clamping rod 571 and a second clamping rod 572 hinged on the side of the second bracket 551 or the third bracket 555, and a spring 573 is arranged between the first clamping rod 571 and the second clamping rod 572, and the first clamping rod 571 and the second clamping rod 572 are both embedded with inherent vibration sensors 574, and the front sections of the first clamping rod 571 and the second clamping rod 572 are arc-shaped structures, which form an annular structure after being merged, so that the vibration sensors 574 on the first clamping rod 571 and the second clamping rod 572 can fit the shaft body of the crankshaft, thereby achieving a better detection effect.

[0060] The present application performs vibration detection on the crankshaft by setting up a detection component 500, and through two connecting seat components 510 that are movably connected to the top cover 300 and the base 100 respectively, the detection component 500 can be moved in the radial area of ​​the crankshaft, and a flexible connection method is used to perform vibration detection on the crankshaft, so that the radial vibration of the crankshaft can be truly transmitted to the vibration sensor 574, thereby improving the authenticity of the detection result.

[0061] When the above equipment is working:

[0062] First, the threaded rod 556 is rotated to control the third bracket 555 to move upward under the limiting action of the positioning rod 554. At this time, the bottom of the crankshaft is placed in the first shaft clamp 540 for preliminary clamping and positioning. Then, the threaded rod 556 is rotated in the opposite direction to move the third bracket 555 downward until the second shaft clamp 560 contacts and clamps the top of the crankshaft. At this time, the crankshaft is fixed;

[0063] Next, the first clamping rod 571 and the second clamping rod 572 are unfolded to place the crankshaft between the first clamping rod 571 and the second clamping rod 572. Then, the first clamping rod 571 and the second clamping rod 572 are loosened to reset the crankshaft under the elastic force of the spring 573, so that the vibration sensor 574 fits with the crankshaft.

[0064] After the crankshaft is fixed, the motor 530 is started, and the output direction of the motor 530 is changed through the gear box 520, thereby driving the first shaft body fixture 540 to rotate. At the same time, the adjustable bracket assembly 550 and the second shaft body fixture 560 rotate accordingly, and the vibration detection device 570 rotates accordingly. At this time, the vibration force generated by the crankshaft during rotation is detected by the vibration sensor 574;

[0065] During the vibration detection process, in order to prevent the rigid connection from absorbing part of the vibration force, when the crankshaft generates radial vibration during rotation, the detection component 500 as a whole can move slightly between the base 100 and the top cover 300. The setting of the first ball sleeve 420 can make the first positioning ball 430 contact and connect with the connecting seat assembly 510 at multiple angles. The setting of the second positioning ball 513 can make the top connecting seat assembly 510 slide at multiple angles in the top cover 300, and make the bottom connecting seat assembly 510 slide at multiple angles in the base 100. At the same time, through the connection of the first positioning balls 430 in multiple elastic limit assemblies 400 with the first annular groove 514, a supporting effect can be formed on the second ball sleeve 512. At the same time, it will not affect the multi-angle sliding state of the two connecting seat assemblies 510. The present application adopts a flexible connection method to perform crankshaft vibration detection, so that the radial vibration of the crankshaft can be truly transmitted to the vibration sensor 574, thereby improving the authenticity of the detection result.

[0066] To prevent external interference from affecting the test results, please refer to Figure 2 , Fig.10 , Fig.11In the present application, a protective component 600 is assembled on the outer side of the second shaft clamp 560, and the protective component 600 includes a special-shaped pipe 610, and an accordion-type hollow elastic bag 620 is fixed at the bottom of the special-shaped pipe 610. Due to its special accordion-type shape, the accordion-type hollow elastic bag 620 can only be expanded and deformed vertically downward. A plurality of hollow blocks 630 are fixed inside the special-shaped pipe 610, and four of the plurality of hollow blocks 630 are fixed to the second shaft clamp 560, and each of the hollow blocks 630 is slidably connected with a slider 650, and each of the hollow blocks 630 is fixed with a liquid storage bag body 640 connected to the special-shaped pipe 610. Since the protective component 600 is assembled on On the second shaft clamp 560, a certain centrifugal force will be generated during the detection process. At this time, under the action of centrifugal force, the sliders 650 in the multiple hollow blocks 630 will slide in an open manner toward the surroundings, thereby squeezing the multiple liquid storage capsules 640 at the same time, and squeezing the liquid inside into the special-shaped pipe 610, and then entering the accordion-type hollow elastic capsule 620, so that the accordion-type hollow elastic capsule 620 expands downward and partially blocks the detection component 500, which can prevent external interference from affecting the detection results. The bottom of the accordion-type hollow elastic capsule 620 is equipped with multiple balancing balls 660 connected by elastic ropes. The setting of the balancing balls 660 can provide a balancing effect for the protective component 600 when it follows the rotation to prevent it from swinging.

[0067] When the above-mentioned protection component 600 is working, since the protection component 600 is assembled on the second shaft clamp 560, when the motor 530 provides power to cause the first shaft clamp 540 and the second shaft clamp 560 to rotate, the protection component 600 as a whole will rotate accordingly. At this time, under the action of centrifugal force, the sliders 650 in the multiple hollow blocks 630 will slide toward their respective liquid storage sacs 640 at the same time, thereby squeezing the multiple liquid storage sacs 640 at the same time, squeezing the liquid inside into the special-shaped pipe 610, and then into the accordion-type hollow elastic sac 620, so that the accordion-type hollow elastic sac 620 expands downward, partially blocking the detection component 500, and preventing external interference from affecting the detection results.

[0068] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A crankshaft vibration testing device, comprising a base (100) and a top cover (300), wherein the base (100) is connected to the top cover (300) via a first bracket (200); It is characterized in that The top of the base (100) and the bottom of the top cover (300) are both arc-shaped groove structures, and elastic limiter components (400) are provided inside the base (100) and the top cover (300). A detection component (500) is movably assembled between the base (100) and the top cover (300) via the elastic limiter component (400), and the detection component (500) comprises: A connecting seat assembly (510) movably connected within the base (100) and the top cover (300) and supported by a plurality of elastic limiting assemblies (400); A motor (530) and a gear box (520) are fixed to the bottom connection seat assembly (510); an output end of the gear box (520) is connected to an output end of the motor (530); and a first shaft fixture (540) is fixed to the other output end of the gear box (520); An adjustable bracket assembly (550) mounted on a side of the first shaft clamp (540), wherein a second shaft clamp (560) is fixed to one end of the adjustable bracket assembly (550) away from the first shaft clamp (540); A vibration detection device (570) is mounted inside the adjustable bracket assembly (550).

2. A crankshaft vibration testing device according to claim 1, characterized in that: The elastic limiting assembly (400) comprises an elastic telescopic rod (410) hinged on the inner wall of the base (100) or the top cover (300), a first ball sleeve (420) being fixed to the front end of the elastic telescopic rod (410), and a first positioning ball (430) being rotatably connected inside the first ball sleeve (420).

3. A crankshaft vibration testing device according to claim 2, characterized in that: The connecting seat assembly (510) comprises a connecting plate (511), a second ball sleeve (512) is fixed on the connecting plate (511), a second positioning ball (513) is rotatably connected inside the second ball sleeve (512), and a first annular groove (514) is formed on the outside of the second ball sleeve (512).

4. A crankshaft vibration testing device according to claim 3, characterized in that: The first annular groove (514) formed on the second ball sleeve (512) matches the specifications of the first positioning ball (430) in the elastic limiting assembly (400), and the first positioning ball (430) is slidably connected in the first annular groove (514).

5. The crankshaft vibration testing device according to claim 1, characterized in that: The adjustable bracket assembly (550) comprises a second bracket (551) fixed to the side of the first shaft clamp (540), a positioning rod (554) being fixed to the top of the second bracket (551), a third bracket (555) passing through the outside of the positioning rod (554) and slidably sleeved, a side of the third bracket (555) being fixed to the second shaft clamp (560), a threaded rod (556) being rotatably connected to the outer side of the second bracket (551) via a bearing, and the threaded rod (556) being threadedly connected to the third bracket (555).

6. A crankshaft vibration testing device according to claim 5, characterized in that: A support rod (552) is fixed to the bottom of the second bracket (551), a friction ball (553) is rotatably connected to the bottom of the support rod (552), a second annular groove (521) is formed at the top of the gear box (520), and the friction ball (553) is rotatably connected in the second annular groove (521).

7. A crankshaft vibration testing device according to claim 6, characterized in that: The vibration detection device (570) comprises a first clamping rod (571) and a second clamping rod (572) hinged on the side of the second bracket (551) or the third bracket (555); a spring (573) is installed between the first clamping rod (571) and the second clamping rod (572); and the first clamping rod (571) and the second clamping rod (572) are both embedded with inherent vibration sensors (574).

8. The crankshaft vibration testing device according to claim 1, characterized in that: The outer side of the second shaft body clamp (560) is equipped with a protective component (600), and the protective component (600) includes a special-shaped pipe (610), and an accordion-type hollow elastic bag (620) is fixed at the bottom of the special-shaped pipe (610), and a plurality of hollow blocks (630) are fixed inside the special-shaped pipe (610), and each of the hollow blocks (630) is slidably connected with a slider (650), and each of the hollow blocks (630) is fixed inside with a liquid storage bag body (640) connected to the special-shaped pipe (610).

9. A crankshaft vibration testing device according to claim 8, characterized in that: The bottom of the accordion-type hollow elastic bag (620) is equipped with a plurality of balancing balls (660) connected by elastic ropes.

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