A fatigue resistance testing apparatus for a shaft workpiece

Abstract

This utility model discloses a fatigue testing device for a shaft workpiece, comprising: a base; a power input component disposed on one side of the top of the base and used to provide torsional force to the shaft to be tested; a support component disposed near the center of the top of the base for providing support to the shaft to be tested; and a fixing component disposed on the top of the base away from the power input component for fixing the other end of the shaft to be tested. The power input component includes a clamping component disposed at one end of the shaft to be tested for fixing the shaft. The power input component also includes a second fixing seat disposed on the base, on which a rotary drive component providing torsional force to the shaft to be tested is disposed. This utility model application adds a clutch component between the motor and the shaft to be tested. If the motor is overloaded, the clutch component disconnects the power transmission, preventing damage to the motor due to overload.

Description

Technical Field

[0001] This utility model relates to the technical field of shaft workpiece testing equipment, specifically a fatigue testing device for shaft workpieces. Background Technology

[0002] In modern industry, shafts, as critical transmission components in mechanical equipment, are widely used in numerous industries such as automotive, aerospace, and energy. During actual operation, shafts are subjected to alternating loads for extended periods, making them highly susceptible to fatigue failure, which can lead to equipment malfunctions or even safety accidents, severely impacting production efficiency and equipment reliability. Therefore, accurately assessing the fatigue resistance of shafts is crucial for ensuring the safe and stable operation of mechanical equipment.

[0003] Chinese utility model patent (authorization announcement number CN220084334U) discloses a fatigue testing device for a motor shaft, including a worktable and a rotating mechanism, a horizontal moving mechanism, a motor shaft, and a support mechanism mounted on the worktable. The rotating mechanism is mounted on the worktable with its output end facing the center of the worktable and rotatably connected to one end of the motor shaft. The horizontal moving mechanism is mounted on the worktable and located in the direction of the output end of the rotating mechanism, movably connected to the end of the motor shaft away from the rotating mechanism. The support mechanism is set on the worktable. Through the cooperation of the rotating mechanism and the horizontal moving mechanism, the motor shaft rotates on the worktable, thereby simulating the working state of the motor shaft. This causes the surface of the motor shaft to gradually bend during rotation, allowing the detection of the maximum bending degree that the motor shaft can withstand.

[0004] This existing technology uses a rotating mechanism to drive the shaft under test to rotate, detecting the torsional force on the bearing under test when the shaft breaks or cracks. However, the rotating mechanism in existing testing equipment mostly uses a motor as the drive source. During the test, the shaft under test is usually in a fixed state. According to the principle of force interaction, when the motor drives the shaft under test to rotate, the shaft under test will exert a reaction force of equal magnitude and opposite direction on the motor. Since the materials and specifications of different shafts vary greatly, the required test torque also varies. If the reaction force applied by the shaft under test exceeds the rated power of the motor, it is very easy to cause motor overload, leading to the burnout of the internal windings of the motor. This not only increases equipment maintenance costs, but also affects testing efficiency due to frequent downtime for maintenance, and also causes problems such as interruption of test data and decreased accuracy. Utility Model Content

[0005] The purpose of this utility model application is to provide a fatigue testing device for shaft workpieces. By adding a clutch assembly between the motor and the shaft to be tested, if the motor is overloaded, the clutch assembly disconnects the power transmission, thus avoiding damage to the motor due to overload.

[0006] To address the problems of existing technologies, this utility model application provides a fatigue testing device for shaft workpieces, characterized by comprising: a base; a power input component disposed on one side of the top of the base and used to provide torsional force to the shaft to be tested; a support component disposed near the center of the top of the base and used to provide support for the shaft to be tested; and a fixing component disposed on the top of the base away from the power input component and used to fix the other end of the shaft to be tested; the power input component includes a clamping component disposed at one end of the shaft to be tested for fixing the shaft to be tested; the power input component further includes a second fixing seat disposed on the base, the second fixing seat being provided with a rotary drive component that provides torsional force to the shaft to be tested; and the power input component further includes a clutch component disposed between the rotary drive component and the clamping component for controlling the transmission of power to the shaft to be tested.

[0007] Preferably, the power input assembly includes a first fixed seat mounted on the base, the clamping assembly includes a support sleeve rotatably mounted on the first fixed seat, one end of the support sleeve being sleeved on the outside of the shaft to be tested, the clutch assembly includes a housing fixed on the first fixed seat, the clutch assembly also includes a friction disc disposed inside the housing, the friction disc being coaxially connected to the support sleeve, and a torque sensor being disposed between the friction disc and the support sleeve, the clutch assembly also includes a clutch disc that can move within the housing and abut against the friction disc and transmit power to the friction disc.

[0008] Preferably, the support sleeve is also provided with an adjusting bolt by means of bolt rotation. One end of the adjusting bolt extends into the interior of the support sleeve and can clamp to a clamping block outside the shaft to be tested.

[0009] Preferably, the power input assembly further includes a power input shaft connected to the output end of the rotary drive, and one end of the power input shaft extends into the interior of the clutch assembly housing, and the clutch disc is slidably disposed on the power input shaft.

[0010] Preferably, the power input shaft has a limiting groove along its length, and several limiting grooves are provided on the power input shaft. The inner wall of the clutch disc also has several limiting blocks that cooperate with the limiting grooves.

[0011] Preferably, the power input assembly further includes a clutch disengagement mechanism capable of driving the clutch disc to slide back and forth on the power input shaft and abutting the clutch disc against the friction disc.

[0012] Preferably, the clutch disengagement mechanism includes a connecting block that can be fixed on a first fixed base, and a lever is rotatably disposed on the connecting block. The clutch disengagement mechanism includes a first bearing sleeved on the clutch disc, and a retaining element is sleeved on the outer ring of the first bearing. The retaining element is movably connected to one end of the lever. The clutch disengagement mechanism also includes a telescopic drive component rotatably disposed on the connecting block, and the output end of the telescopic drive component is connected to the other end of the lever.

[0013] Preferably, the support assembly includes a support seat mounted on the top of the base, and the support seat also has a second bearing sleeved on the shaft to be tested inside.

[0014] Preferably, the fixing component includes a third fixing seat fixed on the base, a support frame fixed at the top of the third fixing seat, and a screw rotatably mounted on the support frame via a thread. A pressure block capable of pressing against the shaft to be tested is also rotatably mounted at the bottom of the screw, and a handle is connected to the top of the screw.

[0015] The advantages of this utility model application compared to the prior art are:

[0016] This application proposes a fatigue testing device for shaft workpieces, the core of which lies in the optimized design of the power input component to achieve overload protection for the rotating drive component. The power input component drives the shaft under test to generate a rotational tendency and integrates a clutch assembly. The clutch assembly consists of a clutch disc, a power input shaft, a friction disc, and a clutch disengagement mechanism. The clutch disc is slidably connected to the power input shaft, while the friction disc is rigidly connected to a support sleeve, which transmits torque to the shaft under test. Under normal operating conditions, the rotating drive component drives the clutch disc to rotate via the power input shaft. The clutch disc and friction disc transmit torque through friction, thereby causing the support sleeve and the shaft under test to twist. This design, through the flexible connection of the friction pair, effectively buffers the impact load during torque transmission, improving the stability of the device. When the rotating drive component experiences an overload, the clutch disengagement mechanism automatically triggers the protection mechanism. Specifically, the telescopic drive component drives a lever to move, causing the locking element and the first bearing to move together, driving the clutch disc to slide on the power input shaft, separating the clutch disc from the friction disc, thus cutting off the power transmission path. This design, through mechanical overload protection, prevents damage to the rotating drive components due to continuous overload, significantly improving the reliability and service life of the equipment. Attached Figure Description

[0017] Figure 1 This is a first three-dimensional structural schematic diagram of a fatigue testing device for shaft workpieces according to this utility model application.

[0018] Figure 2 This is a second three-dimensional structural diagram of a fatigue testing device for shaft workpieces according to this utility model application.

[0019] Figure 3 This is a schematic diagram of the support component structure of a fatigue testing device for shaft workpieces according to this utility model application.

[0020] Figure 4 This is a three-dimensional structural diagram of the power input component of a fatigue testing device for shaft workpieces according to this utility model application.

[0021] Figure 5 This is a first exploded structural diagram of the power input component of a fatigue testing device for shaft workpieces according to this utility model application.

[0022] Figure 6 This is a second exploded structural diagram of the power input component of a fatigue testing device for shaft workpieces according to this utility model application.

[0023] The following components are labeled in the diagram: 1. Base; 2. Power input assembly; 21. First fixed seat; 22. Clutch assembly; 221. Clutch disc; 222. Power input shaft; 2221. Limiting groove; 223. Friction disc; 224. Clutch disengagement mechanism; 2241. Connecting block; 2242. Telescopic drive component; 2243. Lever; 2244. Clamping component; 2245. First bearing; 23. Rotary drive component; 24. Second fixed seat; 25. Support sleeve; 251. Clamping block; 252. Adjusting bolt; 3. Support assembly; 31. Support base; 32. Second bearing; 4. Fixed assembly; 41. Third fixed seat; 42. Pressure block; 43. Screw; 431. Handle; 44. Support frame. Detailed Implementation

[0024] To further understand the features, technical means, and specific objectives and functions achieved by this utility model application, the following detailed description of this utility model application is provided in conjunction with the accompanying drawings and specific embodiments.

[0025] Reference Figures 1-6 As shown, this utility model application provides a fatigue testing device for a shaft workpiece, comprising: a base 1; a power input component 2, disposed on one side of the top of the base 1 and used to provide torsional force to the shaft to be tested; a support component 3, disposed on the top of the base 1 near the center position for providing support to the shaft to be tested; and a fixing component 4, disposed on the top of the base 1 away from the power input component 2 for fixing the other end of the shaft to be tested; the power input component 2 includes a clamping component disposed on one end of the shaft to be tested for fixing the shaft to be tested; the power input component 2 also includes a second fixing seat 24 disposed on the base 1, on which a rotary drive component 23 is disposed to provide torsional force to the shaft to be tested; the power input component 2 also includes a clutch component 22 disposed between the rotary drive component 23 and the clamping component for controlling the transmission of power to the shaft to be tested.

[0026] When the shaft fatigue testing equipment is in operation, one end of the shaft to be tested is first fixed by the clamping assembly in the power input assembly 2, and the other end is fixed by the fixing assembly 4. At the same time, the support assembly 3 provides support for the middle part of the shaft to ensure the stability of the shaft during the test. Then, the rotary drive 23 is started, and the rotary drive 23 begins to rotate, generating power. At this time, by operating the clutch assembly 22, the power is transmitted from the rotary drive 23 to the clamping assembly, and then to the shaft to be tested, so that the shaft to be tested is subjected to torsional force.

[0027] The power input assembly 2 includes a first fixed base 21 mounted on the base 1. The clamping assembly includes a support sleeve 25 rotatably mounted on the first fixed base 21, one end of which is sleeved on the outside of the shaft to be tested. The clutch assembly 22 includes a housing fixed on the first fixed base 21. The clutch assembly 22 also includes a friction disc 223 disposed inside the housing, and the friction disc 223 is coaxially connected to the support sleeve 25. A torque sensor is also disposed between the friction disc 223 and the support sleeve 25. The torque sensor monitors and measures the torque transmitted to the shaft to be tested in real time. During the test, the torque sensor can transmit the detected torque data to the control system (existing technology) so that the operator can understand the torsional force borne by the shaft to be tested in real time. The clutch assembly 22 also includes a clutch disc 221 that can move within the housing and abut against the friction disc 223 to transmit power to the friction disc 223. When the clutch disc 221 abuts against the friction disc 223, power can be transmitted from the rotary drive component 23 to the friction disc 223, and then to the support sleeve 25 and the shaft to be tested; when the clutch disc 221 moves away from the friction disc 223, the power transmission is cut off. By controlling the movement of the clutch disc 221, the engagement and disengagement of power transmission can be flexibly controlled.

[0028] An adjusting bolt 252 is also provided on the support sleeve 25 by means of bolt rotation. One end of the adjusting bolt 252 extends into the interior of the support sleeve 25 and can clamp onto the clamping block 251 outside the shaft to be tested.

[0029] By rotating the adjusting bolt 252, which is rotatably mounted on the support sleeve 25, the adjusting bolt 252 moves along its own axis when rotated, and its end extending into the support sleeve 25 gradually approaches the shaft to be tested. With further rotation of the adjusting bolt 252, it pushes the clamping block 251 towards the shaft to be tested until the clamping block 251 is firmly clamped to the outside of the shaft.

[0030] The power input assembly 2 also includes a power input shaft 222 connected to the output end of the rotary drive 23, with one end of the power input shaft 222 extending into the interior of the clutch assembly 22 housing. A clutch disc 221 is slidably disposed on the power input shaft 222. The power input shaft 222 has several limiting grooves 2221 along its length. The inner wall of the clutch disc 221 also has several limiting blocks that cooperate with the limiting grooves 2221. The function of the limiting grooves 2221 is to cooperate with the limiting blocks on the inner wall of the clutch disc 221 to restrict and guide the movement of the clutch disc 221, ensuring that the clutch disc 221 can slide stably on the power input shaft 222.

[0031] The power input assembly 2 also includes a clutch disengagement mechanism 224 capable of driving the clutch disc 221 to reciprocate on the power input shaft 222 and causing the clutch disc 221 to abut against the friction disc 223. The clutch disengagement mechanism 224 includes a connecting block 2241 that can be fixed on the first fixed base 21, and a lever 2243 is rotatably mounted on the connecting block 2241. The clutch disengagement mechanism 224 includes a first bearing 2245 sleeved on the clutch disc 221. A retaining member 2244 is sleeved on the outer ring of the first bearing 2245, and the retaining member 2244 is movably connected to one end of the lever 2243. The clutch disengagement mechanism 224 also includes a telescopic drive member 2242 rotatably mounted on the connecting block 2241, and the output end of the telescopic drive member 2242 is connected to the other end of the lever 2243.

[0032] When a torsional force needs to be applied to the shaft to be tested, the telescopic drive 2242 starts to work, and its output end extends. Since the output end of the telescopic drive 2242 is connected to the other end of the lever 2243, the extension movement of the telescopic drive 2242 will push the lever 2243 to rotate around the rotating shaft on the connecting block 2241. When the lever 2243 rotates, one end of it will pull the locking piece 2244. Because the locking piece 2244 is sleeved on the outer ring of the first bearing 2245, and the first bearing 2245 is sleeved on the clutch disc 221, the movement of the locking piece 2244 will cause the first bearing 2245 and the clutch disc 221 to slide together on the power input shaft 222, causing the clutch disc 221 to move towards the friction disc 223 until the clutch disc 221 abuts against the friction disc 223. When the rotary drive 23 is overloaded, the output end of the telescopic drive 2242 retracts, causing the lever 2243 to rotate in the opposite direction. When lever 2243 rotates in the reverse direction, one end of it pushes locking member 2244, causing locking member 2244 to drive the first bearing 2245 and clutch disc 221 to slide in the opposite direction on power input shaft 222, away from friction disc 223, thereby cutting off power transmission.

[0033] The support assembly 3 includes a support base 31 mounted on the top of the base 1, and a second bearing 32 sleeved on the shaft to be tested is also provided inside the support base 31. The fixing assembly 4 includes a third fixing base 41 fixed on the base 1, a support frame 44 fixed on the top of the third fixing base 41, and a screw 43 rotatably mounted on the support frame 44 via threads. A pressure block 42 capable of pressing on the shaft to be tested is also rotatably mounted on the bottom of the screw 43, and a handle 431 is connected to the top of the screw 43.

[0034] The operator rotates the screw 43 by the handle 431. Since the screw 43 is connected to the support frame 44 by threads, the screw 43 will gradually move downward, causing the pressure block 42 to press down on the shaft to be tested, thereby firmly fixing the shaft to be tested in the test position.

[0035] The above embodiments only illustrate one or more implementation methods of this utility model application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model application, and these all fall within the protection scope of this utility model application. Therefore, the protection scope of this utility model application should be determined by the appended claims.

Claims

1. A fatigue resistance testing apparatus for a shaft workpiece, characterized by: include: Base (1); The power input assembly (2) is located on one side of the top of the base (1) and is used to provide torsional force to the shaft to be tested; The support assembly (3) is located on the top of the base (1) near the center to provide support for the shaft to be tested; The fixing component (4) is set at the top of the base (1) away from the power input component (2) to fix the other end of the shaft to be tested; The power input assembly (2) includes a clamping assembly disposed at one end of the shaft to be tested for fixing the shaft to be tested; the power input assembly (2) also includes a second fixing seat (24) disposed on the base (1), the second fixing seat (24) is provided with a rotary drive (23) for providing torsional force to the shaft to be tested, and the power input assembly (2) also includes a clutch assembly (22) disposed between the rotary drive (23) and the clamping assembly for controlling the transmission of power to the shaft to be tested.

2. The apparatus for fatigue testing of a shaft workpiece of claim 1 wherein: The power input assembly (2) includes a first fixed seat (21) mounted on the base (1). The clamping assembly includes a support sleeve (25) rotatably mounted on the first fixed seat (21). One end of the support sleeve (25) is sleeved on the outside of the shaft to be tested. The clutch assembly (22) includes a housing fixed on the first fixed seat (21). The clutch assembly (22) also includes a friction disc (223) disposed inside the housing. The friction disc (223) is coaxially connected with the support sleeve (25). A torque sensor is also disposed between the friction disc (223) and the support sleeve (25). The clutch assembly (22) also includes a clutch disc (221) that can move in the housing and abut against the friction disc (223) and transmit power to the friction disc (223).

3. A fatigue testing apparatus for a shaft workpiece according to claim 2, wherein: An adjusting bolt (252) is also provided on the support sleeve (25) by means of bolt rotation. One end of the adjusting bolt (252) extends into the interior of the support sleeve (25) and can be clamped to the clamping block (251) outside the shaft to be tested.

4. The apparatus for fatigue testing of a shaft workpiece of claim 2 wherein: The power input assembly (2) further includes a power input shaft (222) connected to the output end of the rotary drive (23), and one end of the power input shaft (222) extends into the interior of the clutch assembly (22) housing, and the clutch disc (221) is slidably disposed on the power input shaft (222).

5. A fatigue testing apparatus for a shaft workpiece according to claim 4, wherein: The power input shaft (222) has a limiting groove (2221) along its length direction. Several limiting grooves (2221) are provided on the power input shaft (222), and several limiting blocks that cooperate with the limiting grooves (2221) are also provided on the inner wall of the clutch disc (221).

6. A fatigue testing apparatus for a shaft workpiece according to claim 5, wherein: The power input assembly (2) further includes a clutch disengagement mechanism (224) capable of driving the clutch disc (221) to slide back and forth on the power input shaft (222) and causing the clutch disc (221) to abut against the friction disc (223).

7. A fatigue testing apparatus for a shaft workpiece according to claim 6, wherein: The clutch disengagement mechanism (224) includes a connecting block (2241) that can be fixed on a first fixed base (21), and a lever (2243) is rotatably mounted on the connecting block (2241). The clutch disengagement mechanism (224) includes a first bearing (2245) sleeved on the clutch disc (221). A retaining member (2244) is sleeved on the outer ring of the first bearing (2245), and the retaining member (2244) is movably connected to one end of the lever (2243). The clutch disengagement mechanism (224) also includes a telescopic drive member (2242) rotatably mounted on the connecting block (2241), and the output end of the telescopic drive member (2242) is connected to the other end of the lever (2243).

8. The apparatus for fatigue testing of a shaft workpiece of claim 1 wherein: The support assembly (3) includes a support seat (31) installed on the top of the base (1), and a second bearing (32) sleeved on the shaft to be tested is also provided inside the support seat (31).

9. The apparatus for fatigue testing of a shaft workpiece of claim 1 wherein: The fixing component (4) includes a third fixing seat (41) fixed on the base (1), a support frame (44) fixed on the top of the third fixing seat (41), and a screw (43) is rotatably provided on the support frame (44) by means of a thread. A pressure block (42) that can press on the shaft to be tested is also rotatably provided at the bottom of the screw (43). A handle (431) is connected to the top of the screw (43).

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