Method for detecting the axial pull-out force of a single steel ball of a bearing from a plastic cage

Abstract

The application discloses a kind of detection methods of bearing single steel ball axial pulling force from plastic retainer, comprising the following steps: step one, setting fixture (1) clamps single steel ball on retainer;Step two, using tension meter to hook fixture (1), by pulling tension meter and retainer to promote the steel ball clamped by fixture (1) to be separated from retainer, while recording the tension value of tension meter in the process of steel ball separation, and the pulling force is obtained after analyzing and calculating tension value.The detection method of the application, through the setting of step one and step two, can effectively realize the detection of single steel ball pulling force.

Description

Technical Field

[0001] This invention relates to a testing method, and more specifically to a method for testing the pull-out force of a single steel ball in a bearing. Background Technology

[0002] With the continuous development of modern industry, people have increasingly higher requirements for motor speed, and correspondingly higher requirements for bearing speed. Plastic cages are one of the commonly used cage structures in motor bearings. The continuous increase in bearing speed causes the steel balls in the bearing to generate increasingly larger centrifugal forces, accompanied by increasingly larger axial impacts. This axial impact causes the plastic cage of the open bearing to pop out axially, resulting in the rolling elements in the bearing being unable to maintain their spacing. The bearing temperature rise and vibration increase sharply, causing motor failure. Alternatively, one or several steel balls may come out of the cage, causing the cage to contact the bearing races, the temperature rises rapidly, the cage melts, the bearing stops rotating, and motor failure occurs. Therefore, existing technologies need to detect the magnitude of the force by which the steel balls are pulled out of the bearing cage assembly. However, currently, there are only detection devices that can detect all the steel balls being pressed out of the cage, but it is impossible to detect the pull-out force of a single steel ball coming out of the cage. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a method for detecting the pull-out force of a single steel ball in a bearing, which can effectively detect the pull-out force of a single steel ball from the cage.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a method for detecting the axial pull-out force of a single steel ball from a plastic cage in a bearing, comprising the following steps:

[0005] Step 1: Set up a clamp to hold the single steel ball on the cage;

[0006] Step 2: Use a force gauge to hook the clamp, and pull the force gauge and the cage to make the steel ball clamped by the clamp come out of the cage. At the same time, record the pulling force value of the force gauge during the process of the steel ball coming out, and analyze and calculate the pulling force value to obtain the pull-out force.

[0007] As a further improvement to the present invention, the calculation steps for the pull-out force in step two are as follows:

[0008] Step 21: Subtract the two adjacent tensile force values ​​recorded pairwise to obtain the tensile force difference;

[0009] Step 22: Select the two tension values ​​with the largest difference in tension, and use the tension value with the larger value as the pull-out force.

[0010] As a further improvement of the present invention, the clamp includes a left clamping plate and a right clamping plate and a clamping bolt. A spherical groove for embedding a steel ball is provided on the opposite side of the left clamping plate and the right clamping plate. The clamping bolt passes through the right clamping plate and the left clamping plate to connect the left clamping plate and the right clamping plate to each other. The tension gauge is hooked onto the clamping bolt.

[0011] As a further improvement of the present invention, the clamp also includes a clamp base, on the lower side of the clamp base a support leg is fixedly connected, the lower end of the support leg is fixed with a support plate for placing on the external ground, and the side wall of the support leg is provided with a fixing member for clamping and fixing the retainer.

[0012] As a further improvement of the present invention, a telescopic rod is fixedly connected to the upper side of the clamp base, and a receiving platform is fixedly connected to the upper end of the telescopic rod. The body of the tension gauge is installed on the receiving platform, and the pull rod passes down through the receiving platform and the clamp base and hooks the clamping bolt.

[0013] As a further improvement of the present invention, the telescopic rod includes an upper rod and a lower rod. The upper end of the upper rod is rotatably fixed on the lower side of the receiving platform, and the lower end of the lower rod is fixedly installed on the upper side of the clamp base. The lower end of the upper rod passes through the lower rod and is threadedly connected to the lower rod. A drive handwheel is coaxially sleeved on the upper rod.

[0014] As a further improvement of the present invention, a blocking plate is fixed on the side of the lower rod facing the tension gauge, and a blocking disc is coaxially sleeved on the tension gauge's pull rod. A blocking groove adapted to the blocking disc is opened on the lower side of the blocking plate. When the left and right clamping plates cooperate to clamp the steel ball, and the fixing component clamps the fixing retainer and the tension gauge's pull rod hooks the clamping bolt, a gap is left between the blocking disc and the blocking plate.

[0015] As a further improvement of the present invention, a positioning rod is provided in the baffle plate that can be raised and lowered. The lower end of the positioning rod extends into the baffle groove. The lower end face of the drive handwheel is provided with a plurality of positioning holes. The upper end of the positioning rod is adapted to the positioning holes. When the baffle plate is embedded in the baffle groove and abuts against the bottom of the baffle groove, the baffle plate pushes the positioning rod upward, and the upper end of the positioning rod is embedded in the positioning hole to position the drive handwheel.

[0016] As a further improvement of the present invention, the upper end of the positioning rod is provided with a pointed tip, and the positioning hole is a conical hole structure.

[0017] As a further improvement of the present invention, the force gauge also includes an error adjustment step, which is specifically as follows:

[0018] Step 1: Rotate the drive handwheel to raise the receiving platform carrying the tension gauge body, so that the blocking plate is embedded in the blocking groove and the tension gauge reading is 0.

[0019] Step 2: Clamp the steel ball with the left and right clamps, and hold the retainer in place with the fastener. Then pull down the lever of the dynamometer so that it hooks onto the clamping bolt. Finally, zero the reading on the dynamometer.

[0020] The beneficial effect of this invention is that, through the setting of step one, a single steel ball on the retainer can be effectively clamped, and through the setting of step two, the pull-out force can be effectively calculated by using a tension gauge to detect the tension. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the fixture used in the detection method of the present invention;

[0022] Figure 2 for Figure 1 Enlarged view of part A in the middle. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0024] Reference Figures 1 to 2 As shown in this embodiment, a method for detecting the axial pull-out force of a single steel ball from a plastic cage in a bearing includes the following steps:

[0025] Step 1: Set clamp 1 to hold the single steel ball on the cage;

[0026] Step two: Use a force gauge to hook clamp 1, and pull the force gauge and the retainer to make the steel ball clamped by clamp 1 come out of the retainer. At the same time, record the force value of the force gauge during the process of the steel ball coming out, and analyze and calculate the pull-out force. By setting up the above two steps, the pull-out force can be effectively calculated by using a force gauge to measure the force.

[0027] As an improved specific implementation, the calculation steps for the pull-out force in step two are as follows:

[0028] Step 21: Subtract the two adjacent tensile force values ​​recorded pairwise to obtain the tensile force difference;

[0029] Step 22: Select the two tension values ​​with the largest difference in tension, and use the larger tension value as the pull-out force. By setting the above two steps, the pull-out force of the steel ball can be calculated simply and effectively by taking advantage of the characteristic that the tension drops sharply during the process of the steel ball being released.

[0030] As an improved specific implementation, the clamp 1 includes a left clamping plate 11 and a right clamping plate 12 and a clamping bolt 13. The left clamping plate 11 and the right clamping plate 12 have spherical grooves for embedding steel balls on opposite sides. The clamping bolt 13 passes through the right clamping plate 12 and the left clamping plate 11 to connect the left clamping plate 11 and the right clamping plate 12 to each other. The tension gauge is hooked onto the clamping bolt 13. With the above structure, the effect of clamping the steel ball can be achieved simply and effectively.

[0031] As an improved specific implementation, the clamp 1 also includes a clamp base 14, on the lower side of which a support leg 15 is fixedly connected. The lower end of the support leg 15 is fixed with a support plate 16 for placing on the external ground. The side wall of the support leg 15 is provided with a fixing member for clamping and fixing the retainer. With the above structure, the retainer can also be clamped and fixed, making it easier for people to separate the steel ball from the retainer.

[0032] As an improved specific implementation, a telescopic rod 2 is fixedly connected to the upper side of the clamp base 14, and a receiving platform 3 is fixedly connected to the upper end of the telescopic rod 2. The body of the tension gauge is installed on the receiving platform 3. The pull rod passes downward through the receiving platform 3 and the clamp base 14 and hooks the clamping bolt 13. With the above structure, the tension applied to the steel ball by the tension gauge can be changed by adjusting the length of the telescopic rod 2. This achieves a more precise adjustment effect, so there is no need for subsequent precise calculations. People only need to record the tension detected by the tension gauge at the moment the steel ball is released as the pull-out force.

[0033] As an improved specific implementation, the telescopic rod 2 includes an upper rod 21 and a lower rod 22. The upper end of the upper rod 21 is rotatably fixed on the lower side of the receiving platform 3, and the lower end of the lower rod 22 is fixedly installed on the upper side of the clamp base 14. The lower end of the upper rod 21 passes into the lower rod 22 and is threadedly connected to the lower rod 22. A drive handwheel 23 is coaxially sleeved on the upper rod 21. With the above structure, the telescopic effect of the telescopic rod 2 can be simply and effectively achieved by using a threaded connection structure.

[0034] As an improved embodiment, a blocking plate 4 is fixed to the side of the lower rod 22 facing the tension gauge. A blocking disc 5 is coaxially sleeved on the tension gauge's pull rod. A blocking groove 6 adapted to the blocking disc 5 is opened on the lower side of the blocking plate 4. When the left clamping plate 11 and the right clamping plate 12 cooperate to clamp the steel ball, and the fixing component clamps the fixing bracket and the tension gauge's pull rod hooks the clamping bolt 13, a gap is left between the blocking disc 5 and the blocking plate 4. With the above structure, when the steel ball is released, the blocking groove 6 can block the blocking disc 5, thereby maintaining the tension gauge reading at this time. In this way, a mechanical tension gauge can be used, which reduces costs on the one hand and further detects the pull-out force quickly and effectively on the other hand. As an improved specific implementation, a positioning rod 41 is provided in the baffle plate 4 that can be raised and lowered. The lower end of the positioning rod 41 extends into the baffle groove 6. The lower end face of the drive handwheel 23 is provided with several positioning holes. The upper end of the positioning rod 41 is adapted to the positioning holes. When the baffle plate 5 is embedded in the baffle groove 6 and abuts against the bottom of the baffle groove 6, the baffle plate 5 pushes the positioning rod 41 upward, and the upper end of the positioning rod 41 is embedded in the positioning hole to position the drive handwheel 23. With the above structure, the drive handwheel 23 can be effectively positioned when the steel ball is released, avoiding the problem of excessive error between the pulling force and the pull-out force detected by the tension gauge due to excessive rotation of the drive handwheel 23.

[0035] As an improved specific implementation, the upper end of the positioning rod 41 is set with a pointed tip, and the positioning hole is a conical hole structure. With the above structure setting, the drive handwheel 23 can have more positioning positions, which further increases the detection accuracy.

[0036] As one specific embodiment of the improvement, the force gauge also includes an error adjustment step, which is as follows:

[0037] Step 1: Rotate the drive handwheel 23 to drive the receiving platform 3 to rise with the body of the tension gauge, so that the blocking plate 5 is embedded in the blocking groove 6 and the tension gauge reading is 0.

[0038] Step 2: Clamp the steel ball with the left clamping plate 11 and the right clamping plate 12, while the fixing component holds the retainer. Then, pull down the tension gauge rod so that the tension gauge rod hooks onto the clamping bolt 13. Then, zero the reading on the tension gauge. By setting the above steps, the tension detected by the tension gauge can be proportional to the length of the rod to deal with the error caused by the gap setting, which effectively increases the detection accuracy. Thus, the gap setting in this embodiment also has more room for adjustment.

[0039] In summary, the detection method of this embodiment, which uses a force gauge to detect the pulling force, can simply and effectively detect the pull-out force.

[0040] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for detecting the axial pull-out force of a single steel ball from a plastic cage in a bearing, characterized in that: Includes the following steps: Step 1, set up the clamp (1) to clamp the single steel ball on the cage; Step 2: Use a tension gauge to hook the clamp (1), and pull the tension gauge and the retainer to make the steel ball clamped by the clamp (1) come out of the retainer. At the same time, record the tension value of the tension gauge during the process of the steel ball coming out, and analyze and calculate the tension value to obtain the pull-out force. The clamp (1) includes a left clamp plate (11) and a right clamp plate (12) and a clamping bolt (13). The left clamp plate (11) and the right clamp plate (12) have spherical grooves for the steel ball to be embedded on opposite sides. The clamping bolt (13) passes through the right clamp plate (12) and the left clamp plate (11) to connect the left clamp plate (11) and the right clamp plate (12) to each other. The tension gauge hooks onto the clamping bolt (13).

2. The method for detecting the axial pull-out force of a single steel ball from a plastic cage in a bearing according to claim 1, characterized in that: The calculation steps for the pull-out force in step two are as follows: Step 21: Subtract the two adjacent tensile force values ​​recorded pairwise to obtain the tensile force difference; Step 22: Select the two tension values ​​with the largest difference in tension, and use the tension value with the larger value as the pull-out force.

3. The method for detecting the axial pull-out force of a single steel ball from a plastic cage in a bearing according to claim 2, characterized in that: The clamp (1) also includes a clamp base (14), on the lower side of the clamp base (14) a support leg (15) is fixedly connected, and the lower end of the support leg (15) is fixed with a support plate (16) for placing on the external ground. The side wall of the support leg (15) is provided with a fixing member for clamping and fixing the retainer.

4. The method for detecting the axial pull-out force of a single steel ball from a plastic cage in a bearing according to claim 3, characterized in that: A telescopic rod (2) is fixedly connected to the upper side of the clamp base (14), and a receiving platform (3) is fixedly connected to the upper end of the telescopic rod (2). The body of the tension gauge is installed on the receiving platform (3), and the pull rod passes down through the receiving platform (3) and the clamp base (14) and hooks the clamping bolt (13).

5. The method for detecting the axial pull-out force of a single steel ball from a plastic cage in a bearing according to claim 4, characterized in that: The telescopic rod (2) includes an upper rod (21) and a lower rod (22). The upper end of the upper rod (21) is rotatably fixed on the lower side of the receiving platform (3). The lower end of the lower rod (22) is fixedly installed on the upper side of the clamp base (14). The lower end of the upper rod (21) is inserted into the lower rod (22) and threadedly connected to the lower rod (22). A drive handwheel (23) is coaxially sleeved on the upper rod (21).

6. The method for detecting the axial pull-out force of a single steel ball from a plastic cage in a bearing according to claim 5, characterized in that: The lower rod (22) is fixed with a blocking plate (4) on the side facing the tension gauge. A blocking disc (5) is coaxially sleeved on the tension gauge rod. A blocking groove (6) adapted to the blocking disc (5) is opened on the lower side of the blocking plate (4). When the left clamping plate (11) and the right clamping plate (12) cooperate to clamp the steel ball, and the fixing component clamps the fixing bracket and the tension gauge rod hooks the clamping bolt (13), there is a gap between the blocking disc (5) and the blocking plate (4).

7. The method for detecting the axial pull-out force of a single steel ball from a plastic cage in a bearing according to claim 6, characterized in that: The baffle plate (4) is equipped with a positioning rod (41) that can be raised and lowered. The lower end of the positioning rod (41) extends into the baffle groove (6). The lower end face of the drive handwheel (23) is provided with several positioning holes. The upper end of the positioning rod (41) is adapted to the positioning holes. When the baffle plate (5) is embedded in the baffle groove (6) and abuts against the bottom of the baffle groove (6), the baffle plate (5) pushes the positioning rod (41) upward, and the upper end of the positioning rod (41) is embedded in the positioning hole to position the drive handwheel (23).

8. The method for detecting the axial pull-out force of a single steel ball from a plastic cage in a bearing according to claim 7, characterized in that: The upper end of the positioning rod (41) is set with a pointed tip, and the positioning hole is a conical hole structure.

9. The method for detecting the axial pull-out force of a single steel ball from a plastic cage in a bearing according to claim 8, characterized in that: The force gauge also includes an error adjustment step, which is as follows: Step 1: Rotate the drive handwheel (23) to drive the receiving platform (3) to rise with the body of the tension gauge, so that the blocking plate (5) is embedded in the blocking groove (6) and the tension gauge reading is 0; Step 2: Clamp the steel ball with the left clamp (11) and right clamp (12) together, and fix the retainer with the fastener. Then pull down the lever of the tension gauge so that the lever hooks onto the clamping bolt (13). Then clear the reading on the tension gauge to zero.

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