Bearing insulating coating mechanical property detection tool

Abstract

A bearing insulation coating mechanical performance detection tool comprises a platform and a 7-shaped support frame vertically fixed on the platform, and is characterized by further comprising a vertical oil cylinder and a string which are vertically fixed on the platform and located on the rear side of the support frame, and the support frame is provided with a guide wheel for supporting and guiding the string. The thin rope is connected with the telescopic end of the vertical oil cylinder and the tested bearing and is supported and guided by the guide wheel, and the tested bearing is hung on the supporting frame. According to the utility model, the impact resistance of the tested bearing is tested, and the mechanical performance of the tested bearing is detected; the vertical oil cylinder is connected with the thin rope, the guide wheel is used for guiding the thin rope, the hanging height of the detected bearing is adjusted through stretching out and drawing back of the vertical oil cylinder, the detection requirements of different hanging heights of the detected bearing are met, connection between the thin rope and the telescopic end of the vertical oil cylinder is released, the detected bearing freely falls off, the structure is simple, operation is convenient, and practicability is high.

Description

Technical Field

[0001] The utility model relates to a mechanical property detection tooling for a bearing insulation coating, which is used for detecting the mechanical properties of the bearing insulation coating. Background Art

[0002] Bearings are key components of motors, and their performance directly affects the normal operation of motors. With the wide application of motor drive controls such as PWM (Pulse Width Modulation) technology and IGBT (Insulated Gate Bipolar Transistor), the shaft current generated inside the bearings is increasing, resulting in more prominent problems of bearing electro-corrosion damage. Using bearings with insulation coatings is one of the common and effective measures to solve the bearing electro-corrosion fault. The performance of the bearing insulation coating determines the anti-electro-erosion ability of the bearing. With the application of higher-frequency converters, it is necessary to further increase the thickness of the bearing insulation coating to suppress bearing electro-corrosion. However, the increase in coating thickness will lead to a decrease in the mechanical properties of the insulation coating, resulting in problems such as coating breakage and peeling during the use of the bearing. Currently, the existing coating evaluation methods require coating sample preparation, bonding, and stretching on a special metal block to obtain the tensile bonding strength between the coating and the metal.

[0003] The existing traction motor bearing insulation coating performance detection devices and methods have the following deficiencies:

[0004] 1. The existing bearing insulation coating performance detection devices are mainly used for electrical performance detection and lack the detection of the mechanical properties of the insulation coating; for example, the resistance detection device for insulated bearings disclosed in CN209894882U and the bearing insulation resistance detection device disclosed in CN113759173A.

[0005] 2. It can only test the mechanical energy of the coating on standard samples and cannot directly test the performance of the coating on the bearing, especially the performance of the coating at the bearing chamfer.

[0006] 3. It can only perform tensile strength tests and lacks impact resistance tests. Content of the Utility Model

[0007] The mechanical property detection tooling for the bearing insulation coating provided by the utility model forms a test for the impact resistance of the bearing to be measured and realizes the detection of the mechanical properties of the bearing to be measured; a vertical oil cylinder is connected with a thin rope, and the thin rope is guided by a guide wheel. The suspension height of the bearing to be measured is adjusted by the telescopic movement of the vertical oil cylinder to meet the detection requirements of different suspension heights of the bearing to be measured. The connection between the thin rope and the telescopic end of the vertical oil cylinder is untied to make the bearing to be measured free fall. The structure is simple, the operation is convenient, and the practicability is strong.

[0008] To achieve the above purpose, the technical solution adopted by the utility model is:

[0009] Bearing insulation coating mechanical property detection tooling, including a platform and a support frame fixed vertically on the platform and in a shape of "7", characterized in that: it further includes a vertical oil cylinder and a thin rope fixed vertically on the platform and located at the rear side of the support frame. The support frame is provided with guide wheels for supporting and guiding the thin rope. The thin rope is connected to the telescopic end of the vertical oil cylinder and the bearing to be measured and is supported and guided by the guide wheels, and the bearing to be measured is suspended on the support frame.

[0010] Preferably, the support frame includes a vertical rod fixed vertically on the platform and a cross beam fixed at the upper end of the vertical rod and arranged horizontally. The number of guide wheels is at least two so that the thin rope does not contact the support frame. A scale is arranged vertically on the side surface of the vertical rod.

[0011] Preferably, a reading board cooperating with the scale is movably installed on the vertical rod. The reading board is arranged horizontally and can contact the bearing to be measured.

[0012] Preferably, a guide cylinder is installed on the vertical rod in a guiding fit. The reading board is rotatably installed on the guide cylinder and is flush with the top surface of the guide cylinder.

[0013] Preferably, an annular step surface is arranged on the outer wall of the guide cylinder, and a collar cooperating with the guide cylinder is arranged at the end of the reading board. The collar is sleeved on the guide cylinder and abuts against the annular step surface.

[0014] Preferably, the height of the support frame is 1 to 2 meters, and the length of the cross beam does not exceed half of the height of the support frame.

[0015] The beneficial effects of the utility model are:

[0016] The mechanical property detection tooling for the bearing insulation coating of the present utility model, the support frame is vertically fixed on the platform, the vertical oil cylinder is arranged at the rear side of the support frame, the thin rope connects the telescopic end of the vertical oil cylinder and the bearing to be measured and is supported and guided by the guide wheel, the bearing to be measured is suspended on the support frame. During detection, first measure the mass and resistance value of the bearing to be measured, then suspend the bearing to be measured on the support frame with the thin rope and measure the suspension height of the bearing to be measured. Then untie the connection between the thin rope and the telescopic end of the vertical oil cylinder, so that the bearing to be measured freely falls onto the platform. According to the calculation formula of the free-fall impact energy, calculate the impact energy of the bearing to be measured on the platform. Then check the appearance of the insulation coating of the bearing to be measured and measure the resistance value of the bearing to be measured again. According to the changes in the appearance and resistance value of the insulation coating after the bearing to be measured falls, judge whether the mechanical strength of the bearing to be measured is greater than the calculated impact energy, so as to form a test on the impact resistance performance of the bearing to be measured and realize the detection of the mechanical properties of the bearing to be measured; connect the vertical oil cylinder with the thin rope, guide the thin rope with the guide wheel, adjust the suspension height of the bearing to be measured through the telescopic movement of the vertical oil cylinder, meet the detection requirements of different suspension heights of the bearing to be measured, and untie the connection between the thin rope and the telescopic end of the vertical oil cylinder to make the bearing to be measured freely fall. The structure is simple, the operation is convenient, and the practicability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the mechanical property detection tooling for the bearing insulation coating of the present utility model.

[0018] Figure 2 is a schematic diagram of the reading board installed on the support frame.

[0019] Figure 3 is a schematic diagram of the guide cylinder.

[0020] Figure 4 is a schematic diagram of the reading board. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following Figures 1 to 4 will make a detailed description of the embodiments of the present utility model.

[0022] The mechanical property detection tooling for the bearing insulation coating includes a platform 1 and a support frame 2 which is vertically fixed on the platform 1 and is in a shape of "7". It is characterized in that: it further includes a vertical oil cylinder 3 which is vertically fixed on the platform 1 and is located at the rear side of the support frame 2 and a thin rope 4. The support frame 2 is provided with a guide wheel 5 for supporting and guiding the thin rope 4. The thin rope 4 connects the telescopic end of the vertical oil cylinder 3 and the bearing 6 to be measured and is supported and guided by the guide wheel 5, and the bearing 6 to be measured is suspended on the support frame 2.

[0023] The mechanical property detection tooling for the bearing insulation coating described above, the support frame 2 is vertically fixed on the platform 1, the vertical oil cylinder 3 is arranged at the rear side of the support frame 2, the thin rope 4 connects the telescopic end of the vertical oil cylinder 3 and the bearing 6 to be measured and is supported and guided by the guide pulley 5, the bearing 6 to be measured is suspended on the support frame 2. During the detection, first measure the mass and resistance value of the bearing 6 to be measured, then suspend the bearing 6 to be measured on the support frame 2 with the thin rope 4, and measure the suspension height of the bearing 6 to be measured. Then untie the connection between the thin rope 4 and the telescopic end of the vertical oil cylinder 3, so that the bearing 6 to be measured freely falls onto the platform 1. According to the calculation formula of the free-fall impact energy, calculate the impact energy of the bearing 6 to be measured on the platform. Then check the appearance of the insulation coating of the bearing 6 to be measured and measure the resistance value of the bearing to be measured again. According to the changes in the appearance and resistance value of the insulation coating after the bearing to be measured falls, judge whether the mechanical strength of the bearing to be measured is greater than the calculated impact energy, so as to form a test on the impact resistance performance of the bearing to be measured and realize the detection of the mechanical properties of the bearing to be measured; connect the vertical oil cylinder 3 with the thin rope 4, guide the thin rope 4 with the guide pulley 5, adjust the suspension height of the bearing 6 to be measured by the telescopic movement of the vertical oil cylinder 3 to meet the detection requirements of different suspension heights of the bearing 6 to be measured, and untie the connection between the thin rope 4 and the telescopic end of the vertical oil cylinder 3 to make the bearing to be measured freely fall. The structure is simple, the operation is convenient, and the practicability is strong.

[0024] Among them, the support frame 2 includes a vertical rod 21 vertically fixed on the platform and a cross beam 22 fixed at the upper end of the vertical rod 21 and arranged horizontally. The number of guide pulleys 5 is at least two so that the thin rope 4 does not contact the support frame 5. A scale 6 is arranged vertically on the side surface of the vertical rod 21. The scale 6 on the side surface of the vertical rod 21 is used to measure the suspension height of the bearing 6 to be measured. The thin rope 4 is supported by the guide pulley 5 and does not contact the vertical rod 21 and the cross beam 22. The guide pulley 5 guides the thin rope 4 to ensure that the thin rope 4 can suspend the bearing on the support frame 2. After untying the connection between the thin rope 4 and the telescopic end of the vertical oil cylinder 3, the thin rope 4 will move along the guide pulley 5, so that the bearing falls freely vertically.

[0025] Among them, a reading board 7 cooperating with the scale 6 is movably installed on the vertical rod 21. The reading board 7 is arranged horizontally and can contact the bearing 6 to be measured. When the bearing to be measured is suspended in place, contact the reading board 7 with the bearing to be measured, and directly read the suspension height of the bearing to be measured through the position of the reading board 7 on the scale 6, which is convenient for measuring the suspension height of the bearing to be measured.

[0026] The guide cylinder 23 is installed on the vertical rod 21, and the reading plate 7 is rotatably installed on the guide cylinder 23 and flush with the top surface of the guide cylinder 23. The guide cylinder 23 can be guided and moved on the vertical rod 21, and the reading plate 7 rises and falls with the movement of the guide cylinder 23, and contacts the bottom end of the measured bearing 6. The reading plate 7 is flush with the top surface of the guide cylinder 23. The height of the top surface of the guide cylinder 23 is the hanging height of the measured bearing. The hanging height of the measured bearing can be obtained by reading the reading of the top surface of the guide cylinder 23 on the scale 6. After measuring the hanging height, the reading plate 7 is rotated to stagger the reading plate 7 and the measured bearing 6 to avoid interference of the reading plate 7 with the free fall of the measured bearing.

[0027] The outer wall of the guide cylinder 23 has an annular step surface 24, and the end of the reading plate 7 has a sleeve 71 that matches the guide cylinder 23. The sleeve 71 is sleeved on the guide cylinder 23 and abuts against the annular step surface 24. The inner wall of the guide cylinder 23 is guided and matched with the vertical rod 21, and the outer wall is a cylindrical surface. The sleeve 71 is sleeved on the guide cylinder 23, so that the reading plate 7 can rotate on the guide cylinder 23. The reading plate 7 can contact the bottom end of the measured bearing to measure the hanging height of the measured bearing. After the hanging height is measured, the reading plate 7 is rotated to be offset from the measured bearing.

[0028] The height of the support frame 2 is 1-2 meters, and the length of the crossbeam 21 does not exceed half of the height of the support frame. The height of the support frame 2 is designed according to the diameter of the bearing to be tested and the suspension height requirement, so that the bearing to be tested 6 can be suspended on the support frame 2 and meet the suspension height requirement, and the length of the crossbeam 21 does not exceed half of the height of the support frame, thereby improving the structural strength of the support frame.

[0029] The following is a detailed description of the process of using the bearing insulation coating mechanical property testing tool to test the mechanical properties of the tested bearing:

[0030] 1. First measure the mass and resistance value of the bearing 6 to be tested, and then use a thin rope 4 to hang the bearing 6 to be tested on the support frame 2, such as Figure 1 As shown, the suspension height of the measured bearing 6 is measured;

[0031] 2. Untie the connection between the thin rope 4 and the telescopic end of the vertical cylinder 3, and let the bearing 6 under test fall freely onto the platform 1. According to the calculation formula of free fall impact work W=MHg, W is the impact work, H is the height from the center of the bearing to the platform (H is equal to the measured hanging height of the bearing 6 under test minus the radius of the bearing under test), and g is the gravitational acceleration, calculate the impact work W of the bearing 6 under test on the platform;

[0032] 3. Check the appearance of the insulating coating of the measured bearing 6 and measure the resistance value of the measured bearing again. If the measured bearing 6 is not damaged and the resistance value change of the measured bearing is less than 5%, it means that the mechanical strength of the insulating coating of the measured bearing is greater than W, otherwise it is less than W.

[0033] The technical solutions of the embodiments of the present utility model have been completely described in conjunction with the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the scope of protection of the present utility model.

Claims

1. A tool for testing the mechanical properties of the insulating coating of a bearing, comprising a platform and a support frame vertically fixed on the platform and in a 7-shape, characterized in that: It also includes a vertical oil cylinder and a thin rope which are vertically fixed on the platform and located at the rear side of the support frame. The support frame is provided with a guide wheel for supporting and guiding the thin rope. The thin rope connects the telescopic end of the vertical oil cylinder and the bearing to be measured and is supported and guided by the guide wheel, so that the bearing to be measured is suspended on the support frame.

2. The bearing insulation coating mechanical property testing tool according to claim 1 is characterized by: The support frame includes a vertical rod fixed vertically on the platform and a horizontal beam fixed on the upper end of the vertical rod. There are at least two guide wheels so that the thin rope does not contact the support frame. The side of the vertical rod has a scale set vertically.

3. The mechanical property testing tool for bearing insulation coating according to claim 2 is characterized by: A reading board matched with the scale can be movably installed on the vertical rod; the reading board is arranged horizontally and can contact with the bearing to be measured.

4. The bearing insulation coating mechanical property testing tool according to claim 2 is characterized in that: The guide on the vertical rod is matched with a guide cylinder, and the reading plate is rotatably mounted on the guide cylinder and is flush with the top surface of the guide cylinder.

5. The tooling for testing the mechanical properties of the insulating coating of a bearing according to claim 4 is characterized by: The outer wall of the guide cylinder is provided with an annular step surface, and the end of the reading plate is provided with a sleeve ring matched with the guide cylinder, the sleeve ring is sleeved on the guide cylinder and abuts against the annular step surface.

6. The bearing insulation coating mechanical property testing tool according to claim 1 is characterized by: The height of the support frame is 1-2 meters, and the length of the crossbeam does not exceed half of the height of the support frame.

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