Ball cage drawing detection device

Abstract

The invention relates to the technical field of ball cage drawing detection, and discloses a ball cage drawing detection device which comprises a workbench, a drawing device and an angle adjusting device are arranged on the workbench and used for fixing two shafts of a ball cage universal joint respectively, and the drawing device comprises a hydraulic oil cylinder. A vertical tension measuring instrument is arranged at the end of a hydraulic rod in the hydraulic oil cylinder, and a second clamp is connected to the side, away from the hydraulic rod, of the vertical tension measuring instrument. The angle adjusting device comprises a horizontal sliding rail arranged on the workbench, a sliding seat is slidably connected into the horizontal sliding rail, the sliding direction of the sliding seat is perpendicular to the push-pull direction of the hydraulic rod, a first clamp is rotatably connected to the sliding seat, and the first clamp rotates in the sliding direction of the sliding seat. The device has the advantage that the tensile property of the rzeppa universal joint can be accurately detected at multiple angles.

Description

Technical Field

[0001] The invention relates to the technical field of ball cage pull-out detection, in particular to a ball cage pull-out detection device. Background Art

[0002] In mechanical transmission systems such as automobiles, the ball joint on the transmission shaft plays a vital role. It can achieve stable power transmission at different angles and ensure the efficient operation of the transmission system. However, since the ball joint needs to withstand complex forces and motion states during operation, its tensile performance is directly related to the reliability and safety of the entire transmission system.

[0003] As the mechanical manufacturing industry continues to increase its requirements for product quality, traditional testing methods can no longer meet the needs of accurately and efficiently evaluating the tensile performance of ball joints. Some previous testing methods may have problems with low testing accuracy and cannot accurately measure the ultimate tensile force that the ball joint can withstand under different working conditions, resulting in some poor quality ball joints entering the market, increasing the risk of vehicle transmission system failure.

[0004] With reference to a ball cage pull-out detection device with patent publication number CN2872334Y, it is found that the prior art still has the following defects: the angle of detection of the ball cage universal joint is single, and only vertical pull-out detection is performed when the two axes are coaxial, and there is a lack of detection when the two axes are at a certain tilt angle under other working conditions. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a ball cage pull-out detection device, which has the advantage of accurately detecting the tensile performance of the ball cage universal joint at multiple angles, and solves the problem that the prior art has a single angle for detecting the ball cage universal joint, and only has vertical pull-out detection when the two axes are coaxial, and lacks detection when the two axes are at a certain tilt angle under other working conditions.

[0006] (II) Technical solution To achieve the above object, the present invention provides the following technical solutions: A ball cage pull-out detection device comprises a workbench, on which a pull-out device and an angle adjustment device are arranged, for respectively fixing two shafts of a ball cage universal joint, the pull-out device comprises a hydraulic oil cylinder, a vertical tension measuring instrument is arranged at the end of a hydraulic rod in the hydraulic oil cylinder, and a second clamp is connected to the side of the vertical tension measuring instrument away from the hydraulic rod; The angle adjustment device comprises a horizontal slide rail arranged on the workbench, a slide seat is slidably connected in the horizontal slide rail, the sliding direction of the slide seat is perpendicular to the push-pull direction of the hydraulic rod, a No. 1 clamp is rotatably connected to the slide seat, and the No. 1 clamp rotates along the sliding direction of the slide seat; The No. 1 clamp and the No. 2 clamp are used to fix the two shafts of the ball cage universal joint respectively, adjust the angle between the two shafts by sliding the sliding seat, apply tension to the ball cage universal joint by starting the hydraulic cylinder, and detect the tension size by a vertical tension measuring instrument.

[0007] Preferably, a tilt tension measuring instrument is also provided on the side of the No. 1 clamp away from the ball cage universal joint, and two symmetrical support plates are provided on the sliding seat, each support plate is provided with a rotating shaft rod, and a rotating shaft hole is provided on the tilt tension measuring instrument at a position corresponding to the rotating shaft rod. During installation, the rotating shaft rod is inserted into the rotating shaft hole and rotatably connected. The tilt tension measuring instrument and the No. 1 clamp rotate around the rotating shaft rod together, and the tilt tension measuring instrument is used to measure the magnitude of the tension applied to the No. 1 clamp.

[0008] Preferably, the side of the vertical tension measuring instrument away from the hydraulic rod is connected to the No. 2 clamp by setting a lifting sleeve, a lifting rod with a sliding connection is set in the lifting sleeve, and the No. 2 clamp is set at the end of the lifting rod away from the lifting sleeve, and a sliding cavity is set on the inner wall of the lifting sleeve, and a groove is set on the circumference of the outer wall of the lifting rod, and a top block is slidably connected in the groove, and one side of each top block located in the lifting rod is connected to the lifting rod through a spring, and under the action of the spring, the top block slides along the groove and protrudes outward, so that the top block is stuck in the sliding cavity and slides, and the upper and lower surfaces of the end of the top block located on the outside of the lifting rod are chamfered.

[0009] Preferably, the chamfer slope of the upper side of the top block is closer to vertical than that of the lower side, and the chamfer slope of the lower side of the top block is closer to horizontal than that of the upper side.

[0010] Preferably, the structures for fixing the two shafts of the ball cage universal joint on the second clamp and the tilt tension measuring instrument are fixed by either threaded connection or by setting a clamp that moves synchronously inward in a circumferential direction.

[0011] Preferably, a vertical column is arranged on the workbench, a top plate is arranged on the top of the column, the hydraulic cylinder is arranged on the top of the top plate, and the hydraulic rod passes through the top plate.

[0012] Preferably, removable vertical plates are provided at both ends of the sliding direction of the sliding seat in the hydraulic cylinder, a threaded rod is provided between the two vertical plates, and a threaded hole is provided at a position corresponding to the threaded rod passing through the sliding seat, the threaded rod is connected to the threaded hole by threads, the threaded rod is rotatably connected in one of the vertical plates, and a power input device is provided on the outside of the other vertical plate, and the power input device is used to rotate the threaded rod.

[0013] Preferably, the power input device is any one of a rotating handle or a transmission connection with a motor through a belt or a transmission connection with a motor through a gear.

[0014] Preferably, a piston sleeve is provided at the end of the hydraulic rod located in the hydraulic cylinder, and the hydraulic oil in the hydraulic cylinder is located on the side of the hydraulic rod piston sleeve close to the ball cage universal joint. When the hydraulic pressure in the hydraulic cylinder increases, the hydraulic rod is retracted into the hydraulic cylinder by pushing the piston sleeve upward.

[0015] Preferably, the rotating shaft rod is divided into three sections, including a nut section, a threaded section and a smooth section, wherein the nut section is fitted on the rotating shaft rod, the threaded section is engaged with the threaded hole on the rotating shaft rod, and the smooth section is fitted in the rotating shaft hole.

[0016] (III) Beneficial effects Compared with the prior art, the present invention provides a ball cage pull-out detection device, which has the following beneficial effects: 1. The ball cage pulling detection device is provided with a pulling device and an angle adjustment device on a workbench to fix the two ends of the ball cage universal joint respectively, wherein the hydraulic cylinder in the pulling device provides an upward pulling force to the ball cage universal joint, and the pulling force is detected by a vertical tension measuring instrument, and the sliding seat in the angle adjustment device changes the angle between the two axes of the ball cage universal joint during the sliding process, thereby being able to detect the tensile performance of the ball cage universal joint at different angles.

[0017] 2. The ball cage pulling detection device is provided with an inclined tension measuring instrument on the No. 1 clamp in the angle adjustment device, which is used to detect the tension applied to the inclined shaft on the ball cage universal joint. Since the ball cage universal joint is in a balanced state during the pulling process, the inclination angle of the shaft in the inclined state can be inferred based on the ratio of the tension values ​​in the vertical tension measuring instrument and the inclined tension measuring instrument. That is, there is an error in the inclination angle obtained by adjusting the position of the sliding seat before starting the pulling. The inclination angle can be calibrated by calculating the tension value, thereby improving the detection accuracy.

[0018] 3. The ball cage pulling detection device has a lifting sleeve connected to a second clamp at the bottom of the vertical tension measuring instrument, the lifting sleeve is slidably connected to a lifting rod, the second clamp is arranged at the bottom of the lifting rod, the outer wall of the lifting rod and the inner wall of the lifting sleeve are limited by a top block and a sliding cavity. During the installation stage, the lifting rod slides in the lifting sleeve to facilitate fixing the ball cage universal joint at multiple angles, and during the detection stage, when the tension value is too large, the top block will retract into the lifting rod to avoid damage to the ball cage universal joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a structural schematic diagram of the angle adjustment device of the present invention.

[0021] Figure 3It is a schematic diagram of the structure of the tilt tension measuring instrument after being decomposed.

[0022] Figure 4 It is a schematic structural diagram of the drawing device of the present invention.

[0023] Figure 5 It is a structural schematic diagram of the lifting sleeve of the present invention.

[0024] Figure 6 It is a structural schematic diagram of the lifting rod of the present invention.

[0025] Figure 7 It is a cross-sectional view of the present invention.

[0026] Figure 8 For the present invention Figure 7 A partial enlarged view of area A.

[0027] Fig. 9 It is a cross-sectional view of the hydraulic cylinder of the present invention.

[0028] In the figure: 11, workbench; 12, column; 13, top plate; 2, pulling device; 3, angle adjustment device; 4, ball cage universal joint; 31, horizontal slide rail; 32, sliding seat; 33, support plate; 34, tilt tension measuring instrument; 35, No. 1 clamp; 311, threaded rod; 312, power input device; 321, threaded hole; 331, shaft rod; 341, shaft hole; 21, hydraulic cylinder; 22, hydraulic rod; 23, vertical tension measuring instrument; 24, lifting sleeve; 241, sliding cavity; 25, lifting rod; 251, top block; 26, No. 2 clamp. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0031] In addition, a fixed connection refers to a connection in which there is no relative movement after the parts or components are fixed; a transmission connection refers to a connection method in which mechanical motion or torque is transmitted to other working parts through a transmission part; a sliding connection refers to a connection method in which two objects are in contact but not fixed and can slide relative to each other; a rotating connection refers to a connection method in which two objects are in contact but not fixed and can rotate relative to each other.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] Embodiment 1: This embodiment provides a ball cage pull-out detection device having the following technical features.

[0034] See also Figure 1-9 A ball cage pull-out detection device comprises a workbench 11, on which a pull-out device 2 and an angle adjustment device 3 are provided, for respectively fixing two shafts of a ball cage universal joint 4, the pull-out device 2 comprises a hydraulic cylinder 21, a vertical tension measuring instrument 23 is provided at the end of a hydraulic rod 22 in the hydraulic cylinder 21, and a second clamp 26 is connected to the side of the vertical tension measuring instrument 23 away from the hydraulic rod 22; The angle adjustment device 3 includes a horizontal slide rail 31 arranged on the workbench 11, a sliding seat 32 is slidably connected in the horizontal slide rail 31, the sliding direction of the sliding seat 32 is perpendicular to the push-pull direction of the hydraulic rod 22, and a No. 1 clamp 35 is rotatably connected to the sliding seat 32, and the No. 1 clamp 35 rotates along the sliding direction of the sliding seat 32; The No. 1 clamp 35 and the No. 2 clamp 26 are used to fix the two axes of the ball cage universal joint 4 respectively, and the angle between the two axes is adjusted by sliding the sliding seat 32. The tension is applied to the ball cage universal joint 4 by starting the hydraulic cylinder 21, and the tension is detected by the vertical tension measuring instrument 23.

[0035] In an optional embodiment, a tilt tension measuring instrument 34 is further provided on the side of the No. 1 clamp 35 away from the ball cage universal joint 4, and two symmetrical support plates 33 are provided on the sliding seat 32, and each support plate 33 is provided with a rotating shaft rod 331. A rotating shaft hole 341 is provided at a position corresponding to the rotating shaft rod 331 on the tilt tension measuring instrument 34. During installation, the rotating shaft rod 331 is inserted into the rotating shaft hole 341 and rotated to connect. The tilt tension measuring instrument 34 and the No. 1 clamp 35 rotate around the rotating shaft rod 331 together, and the tilt tension measuring instrument 34 is used to measure the magnitude of the tension applied to the No. 1 clamp 35.

[0036] In an optional embodiment, the side of the vertical tension measuring instrument 23 away from the hydraulic rod 22 is connected to the second clamp 26 by setting a lifting sleeve 24, and a slidably connected lifting rod 25 is set in the lifting sleeve 24, and the second clamp 26 is set at the end of the lifting rod 25 away from the lifting sleeve 24, and a sliding cavity 241 is set on the inner wall of the lifting sleeve 24, and a groove is set on the circumference of the outer wall of the lifting rod 25, and a top block 251 is slidably connected in the groove. One side of each top block 251 located in the lifting rod 25 is connected to the lifting rod 25 through a spring. Under the action of the spring, the top block 251 slides along the groove and protrudes outward, so that the top block 251 is stuck in the sliding cavity 241 and slides, and the upper and lower surfaces of the end of the top block 251 located on the outside of the lifting rod 25 are chamfered.

[0037] In an optional embodiment, the chamfer slope of the upper side of the top block 251 is closer to vertical than that of the lower side, and the chamfer slope of the lower side of the top block 251 is closer to horizontal than that of the upper side.

[0038] In an optional embodiment, the structures for fixing the two shafts of the ball cage universal joint 4 on the second clamp 26 and the tilt tension measuring instrument 34 are fixed by threaded connection or by setting a clamp that moves synchronously inward in a circumferential direction.

[0039] In an optional embodiment, a vertical column 12 is disposed on the workbench 11 , a top plate 13 is disposed on the top of the column 12 , the hydraulic cylinder 21 is disposed on the top of the top plate 13 , and the hydraulic rod 22 passes through the top plate 13 .

[0040] In an optional embodiment, detachable vertical plates are provided at both ends of the hydraulic cylinder 21 along the sliding direction of the sliding seat 32, a threaded rod 311 is provided between the two vertical plates, and a threaded hole 321 is provided at a position corresponding to the threaded rod 311 passing through the sliding seat 32, the threaded rod 311 and the threaded hole 321 are connected to each other through threads, the threaded rod 311 is rotatably connected in one of the vertical plates, and a power input device 312 is provided on the outside of the other vertical plate, and the power input device 312 is used to rotate the threaded rod 311.

[0041] In an optional embodiment, the power input device 312 is any one of a rotating handle or a transmission connection with a motor through a belt or a transmission connection with a motor through a gear.

[0042] In an optional embodiment, a piston sleeve is provided at the end of the hydraulic rod 22 located in the hydraulic cylinder 21, and the hydraulic oil in the hydraulic cylinder 21 is located on the side of the piston sleeve of the hydraulic rod 22 close to the ball cage universal joint 4. When the hydraulic pressure in the hydraulic cylinder 21 increases, the hydraulic rod 22 is retracted into the hydraulic cylinder 21 by pushing the piston sleeve upward.

[0043] In an optional embodiment, the shaft rod 331 is divided into three sections, including a nut section, a threaded section and a smooth section, wherein the nut section is attached to the shaft rod 331, the threaded section is engaged with the threaded hole on the shaft rod 331, and the smooth section is attached to the shaft hole 341.

[0044] It should be noted that the tension measuring instrument is an instrument that uses the elasticity of metal to measure the magnitude of tension.

[0045] It should be noted that a control device is provided in the workbench 11, and the control device includes a receiving module, a control module, a power module and a display module; the receiving module detects the tension value of the vertical tension measuring instrument 23 and the inclined tension measuring instrument 34 through a wired or wireless connection; the control module controls the pressurization or decompression of the hydraulic cylinder 21 through an electrical connection, and controls the motor in the power input device 312 to drive the threaded rod 311 to rotate; the display module includes a display screen for displaying the received and processed data; the power module is used to supply power to other modules.

[0046] It should be noted that when the tension detected in the vertical tension measuring instrument 23 drops suddenly, it is determined that the ball cage universal joint 4 has been detached.

[0047] It should be noted that a scale is provided on the horizontal slide rail 31 for determining the sliding position of the slide seat 32 .

[0048] Working principle: First, control the hydraulic cylinder 21 to reduce pressure so that the hydraulic rod 22 slides downward; secondly, fix the upper end shaft of the ball cage universal joint 4 on the second clamp 26, and manually control the second clamp 26 and the lifting rod 25 to slide upward, that is, the lifting rod 25 slides in the lifting sleeve 24, and the top block 251 slides in the sliding cavity 241; then, fix the lower end shaft of the ball cage universal joint 4 on the first clamp 35; then, control the threaded rod 311 to rotate to make the sliding seat 32 slide in the horizontal slide rail 31, so as to control the angle between the two axes of the ball cage universal joint 4. During the sliding process of the sliding seat 32, the tilt tension measuring instrument 34 and the first clamp 35 rotate on the sliding seat 32, and the lifting rod 25 slides in the lifting sleeve 24; then, after adjusting the angle, control the hydraulic cylinder 21 to increase pressure so that the hydraulic rod 22 slides upward, and during the lifting and lowering process, the lifting rod 25 slides in the lifting and lowering sleeve 24. After the rod 25 no longer slides relative to the lifting sleeve 24, that is, after maintaining a balanced state, the tension in the vertical tension measuring instrument 23 and the tilt tension measuring instrument 34 is recorded, and then the tension of the hydraulic cylinder 21 continues to be increased, and the tension values ​​in the vertical tension measuring instrument 23 and the tilt tension measuring instrument 34 are recorded in real time; if the tensile performance of the ball cage universal joint 4 is qualified, then the hydraulic cylinder 21 is closed after the tension value in the vertical tension measuring instrument 23 passes through the preset tension value. At this time, if a fault occurs in the equipment detection, resulting in the hydraulic cylinder 21 program pressurization, this will prevent the ball cage universal joint 4 from being subjected to excessive pressure by pressing the top block 251 into the lifting rod 25, so that the lifting rod 25 is separated from the lifting sleeve 24; if the tensile performance of the ball cage universal joint 4 is unqualified, then the vertical tension measuring instrument 23 will record the pressure value when the ball cage universal joint 4 is separated.

[0049] In summary, the ball cage pulling detection device has a pulling device 2 and an angle adjustment device 3 arranged on a workbench 11 to respectively fix the two ends of the ball cage universal joint 4, wherein the hydraulic cylinder 21 in the pulling device 2 provides an upward pulling force to the ball cage universal joint 4, and detects the magnitude of the pulling force through a vertical tension measuring instrument 23, and the sliding seat 32 in the angle adjustment device 3 changes the angle between the two axes of the ball cage universal joint 4 during the sliding process, thereby being able to detect the tensile performance of the ball cage universal joint 4 at different angles.

[0050] The ball cage pulling detection device is provided with an inclined tension measuring instrument 34 on the No. 1 clamp 35 in the angle adjustment device 3, which is used to detect the tension applied to the shaft in an inclined state on the ball cage universal joint 4. Since the ball cage universal joint 4 is in a balanced state during the pulling process, the inclination angle of the shaft in the inclined state can be inferred based on the ratio of the tension values ​​in the vertical tension measuring instrument 23 and the inclined tension measuring instrument 34. That is, there is an error in the inclination angle obtained by adjusting the position of the sliding seat 32 before starting the pulling. The inclination angle can be calibrated by calculating the tension value, thereby improving the detection accuracy.

[0051] The ball cage pulling detection device has a lifting sleeve 24 connected to a second clamp 26 at the bottom of a vertical tension measuring instrument 23, a lifting sleeve 24 is slidably connected to a lifting rod 25, and the second clamp 26 is arranged at the bottom of the lifting rod 25. The outer wall of the lifting rod 25 and the inner wall of the lifting sleeve 24 are limited by a top block 251 and a sliding cavity 241. During the installation stage, the lifting rod 25 slides in the lifting sleeve 24 to facilitate fixing the ball cage universal joint 4 at multiple angles. During the detection stage, when the tension value is too large, the top block 251 will retract into the lifting rod 25 to avoid damage to the ball cage universal joint 4.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ball cage pull-out detection device, comprising a workbench (11), characterized in that: The workbench (11) is provided with a pulling device (2) and an angle adjustment device (3) for respectively fixing the two shafts of the ball cage universal joint (4); the pulling device (2) comprises a hydraulic cylinder (21); a vertical tension measuring instrument (23) is provided at the end of a hydraulic rod (22) in the hydraulic cylinder (21); a second clamp (26) is connected to the side of the vertical tension measuring instrument (23) away from the hydraulic rod (22); The angle adjustment device (3) comprises a horizontal slide rail (31) arranged on the workbench (11), a slide seat (32) is slidably connected inside the horizontal slide rail (31), the sliding direction of the slide seat (32) is perpendicular to the push-pull direction of the hydraulic rod (22), and a No. 1 clamp (35) is rotatably connected to the slide seat (32), and the No. 1 clamp (35) rotates along the sliding direction of the slide seat (32); The first clamp (35) and the second clamp (26) are used to fix the two shafts of the ball cage universal joint (4) respectively, and the angle between the two shafts is adjusted by sliding the sliding seat (32). The tension is applied to the ball cage universal joint (4) by starting the hydraulic cylinder (21), and the tension is detected by the vertical tension measuring instrument (23).

2. A ball cage pull-out detection device according to claim 1, characterized in that: A tilt tension measuring instrument (34) is also provided on the side of the No. 1 clamp (35) away from the ball cage universal joint (4), and two symmetrical support plates (33) are provided on the sliding seat (32), and each support plate (33) is provided with a rotating shaft rod (331). A rotating shaft hole (341) is provided on the tilt tension measuring instrument (34) at a position corresponding to the rotating shaft rod (331). During installation, the rotating shaft rod (331) is inserted into the rotating shaft hole (341) for rotational connection, and the tilt tension measuring instrument (34) and the No. 1 clamp (35) rotate together around the rotating shaft rod (331). The tilt tension measuring instrument (34) is used to measure the magnitude of the tension applied to the No. 1 clamp (35).

3. A ball cage pull-out detection device according to claim 2, characterized in that: The side of the vertical tension measuring instrument (23) away from the hydraulic rod (22) is connected to the second clamp (26) by providing a lifting sleeve (24), a lifting rod (25) slidably connected is provided in the lifting sleeve (24), and the second clamp (26) is provided at one end of the lifting rod (25) away from the lifting sleeve (24), a sliding cavity (241) is provided on the inner wall of the lifting sleeve (24), a groove is provided on the circumference of the outer wall of the lifting rod (25), and a top block (251) is slidably connected in the groove, and one side of each top block (251) located in the lifting rod (25) is connected to the lifting rod (25) through a spring, and under the action of the spring, the top block (251) slides along the groove and protrudes outward, so that the top block (251) is stuck in the sliding cavity (241) and slides, and the upper and lower surfaces of the end of the top block (251) located outside the lifting rod (25) are both chamfered.

4. A ball cage pull-out detection device according to claim 3, characterized in that: The chamfer slope of the upper side of the top block (251) is closer to vertical than that of the lower side, and the chamfer slope of the lower side of the top block (251) is closer to horizontal than that of the upper side.

5. A ball cage pull-out detection device according to claim 1, characterized in that: The structures for fixing the two shafts of the ball cage universal joint (4) on the second clamp (26) and the tilt tension measuring instrument (34) are fixed by threaded connection or by setting a clamp that moves synchronously inward in a circumferential direction.

6. A ball cage pull-out detection device according to claim 1, characterized in that: A vertical column (12) is arranged on the workbench (11), a top plate (13) is arranged on the top of the column (12), the hydraulic cylinder (21) is arranged on the top of the top plate (13), and the hydraulic rod (22) passes through the top plate (13).

7. A ball cage pull-out detection device according to claim 1, characterized in that: Removable vertical plates are arranged at both ends of the sliding direction of the sliding seat (32) in the hydraulic cylinder (21); a threaded rod (311) is arranged between the two vertical plates; a threaded hole (321) is arranged on the sliding seat (32) at a position corresponding to the threaded rod (311) passing through; the threaded rod (311) and the threaded hole (321) are connected by threads; the threaded rod (311) is rotatably connected in one of the vertical plates; a power input device (312) is arranged on the outside of the other vertical plate; the power input device (312) is used to rotate the threaded rod (311).

8. A ball cage pull-out detection device according to claim 7, characterized in that: The power input device (312) is any one of a rotating handle or a belt-driven connection with a motor or a gear-driven connection with a motor.

9. A ball cage pull-out detection device according to claim 1, characterized in that: A piston sleeve is provided at the end of the hydraulic rod (22) located in the hydraulic cylinder (21); the hydraulic oil in the hydraulic cylinder (21) is located on a side of the piston sleeve of the hydraulic rod (22) close to the ball cage universal joint (4); when the hydraulic pressure in the hydraulic cylinder (21) increases, the hydraulic rod (22) is retracted into the hydraulic cylinder (21) by pushing the piston sleeve upward.

10. A ball cage pull-out detection device according to claim 2, characterized in that: The rotating shaft rod (331) is divided into three sections, including a nut section, a threaded section and a smooth section, wherein the nut section is fitted on the rotating shaft rod (331), the threaded section is meshed with a threaded hole on the rotating shaft rod (331), and the smooth section is fitted in the rotating shaft hole (341).

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