Positioning fixture for detecting rotation flexibility of fixed bearing
By designing positioning fixtures, using pneumatic chucks and servo motors and other facilities, it provides large torque to drive the bearing rotation, which solves the problem that the internal tightening structure in the existing technology cannot provide large torque, and realizes effective detection of bearing rotation flexibility.
Patent Information
- Application Number
- CN202422473728.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-12
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-10-12
AI Technical Summary
When the prior art automatically detects the rotation flexibility of the bearing, the internal tightening structure is affected by the elasticity of the material and friction, and cannot provide large torque drive.
It adopts automated facilities such as pneumatic chucks, servo motors, slide rails, etc., combined with the principle of cap preparation, and designs positioning fixtures to provide a large rotational torque.
It realizes effective rotation flexibility detection of bearings, solving the problem that the internal tightening structure cannot provide large torque.
Smart Images
Figure CN223301538U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of mechanical processing and detection, and relates to a positioning fixture for detecting the rotation flexibility of a bearing after it is fixed. Background Art
[0002] The outer ring slotted self-lubricating bearings and spherical plain bearings installed on the aircraft control system and other parts should be installed according to Figure 1 The rotational flexibility is checked in a prescribed manner. When checking the rotational flexibility of the bearing inner ring, the bearing inner ring should rotate a certain number of revolutions under the action of the Mkp torque.
[0003] At present, when automatically testing rotational flexibility, pneumatic chucks, servo motors, slide rails and other automated facilities are generally used to tighten the inner hole of the bearing inner ring with an internal expansion structure, and then apply torque to drive the bearing inner ring to rotate. This internal expansion structure is affected by factors such as material elasticity, structure and friction between the bearing inner hole, and cannot achieve high torque. Utility Model Content
[0004] In view of this, the utility model provides a positioning fixture for detecting the rotational flexibility of the bearing after it is fixed. With the help of automated facilities such as pneumatic chucks, servo motors, slide rails, and the principle of pre-capping, it can provide a larger rotational torque for the detection of the rotational flexibility of the bearing.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A positioning fixture for detecting the rotational flexibility of a bearing after it is fixed, the positioning fixture comprises a pneumatic chuck 1, a positioning core shaft 2, a fastening rod 4, a flange 5, a servo motor 6, a slide rail 7, a toggle clamp 8, a positioning plate 9, and a retaining spring.
[0007] The pneumatic chuck 1 is fixed on the operating platform by a bracket so that the axis of its jaw part is horizontal. The pneumatic chuck 1 includes three jaws, and the clamping surface of the jaws is an arc surface, which forms a cylindrical surface when closed.
[0008] The positioning core shaft 2 is a four-section stepped shaft, the first section is used to be clamped in the three jaws of the pneumatic chuck 1, the outer diameter of the second section is larger than the first section, and the step between the two sections is used to position with the end face of the jaws of the pneumatic chuck 1, the outer diameter of the third section is between the inner hole diameter of the inner ring and the inner hole diameter of the outer ring of the bearing on the part to be measured 3, and is used to avoid the external structure of the part to be measured 3, the fourth section is provided with an external thread, and the outer diameter of the thread is matched with the clearance of the inner hole of the inner ring of the bearing on the part to be measured 3, and the end of the fourth section is set to be tapered, which is used for guiding when penetrating into the inner hole of the bearing of the part to be measured 3. After penetration, the inner ring end face of the bearing fits on the stepped surface of the third and fourth sections.
[0009] The positioning plate 9 is vertically fixed on the operating platform and is located below the positioning core shaft 2. A positioning groove is provided on the upper part of the positioning plate 9 according to the shape of the part to be measured 3, so that the part to be measured 3 can be embedded in the groove to achieve positioning. After embedding, the bearing protrudes above the top of the positioning plate 9, and the inner ring of the bearing penetrates into the fourth section of the positioning core shaft 2. At the same time, the position and shape of the positioning plate 9 are coordinated with the shape of the part to avoid interference with the positioning core shaft 2 and other structures during operation.
[0010] The toggle clamp 8 is a standard part, fixed on the positioning plate 9. Its jaws are modified according to the shape of the part to be measured 3 so that it fits the part to be measured 3. By turning the wrench to provide a clamping force, the part to be measured 3 is clamped on the positioning plate 9.
[0011] The slide rail 7 is a standard component, fixed on the other side of the positioning plate 9 on the operating platform, and arranged along the axis direction of the positioning core shaft 2.
[0012] The servo motor 6 is a standard component, which is installed on the slider of the slide rail 7 and is used to provide torque. Its main axis extends toward the positioning core shaft 2 and is coaxial with the positioning core shaft 2.
[0013] The middle section of the flange 5 is a disc, and a coaxial circular boss is provided in the center of one side of the disc, and an inner hole and a groove are provided on the circular boss, which is used to be inserted into the main shaft of the servo motor 6 and coaxial, fastened to the main shaft of the servo motor 6 by bolts and rotate coaxially. A coaxial thin cylinder is provided in the center of the other side of the disc, and the thin cylinder has a groove and an inner hole along the axis for inserting and fitting the fastening rod 4. An annular groove is provided at the end of the thin cylinder, and the fastening rod 4 is fixed by a retaining spring.
[0014] The main body of the fastening rod 4 is cylindrical, and one end thereof is provided with protrusions on both sides along the radial direction, which is used to be inserted into the inner hole and groove of the thin cylinder of the flange 5 so that the two are coaxial and rotate synchronously. The other end of the fastening rod 4 is provided with an internal thread, which is used to cooperate with the external thread of the fourth section of the positioning core shaft 2 to clamp the two end faces of the bearing inner ring of the part to be tested 3.
[0015] The beneficial effects of the present invention are as follows: the present invention can provide a larger torque, and solve the problem of a larger starting torque of the inner ring of some bearing parts. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the inspection requirements after the bearing is installed.
[0017] Figure 2 It is a schematic diagram of the overall structure of the utility model.
[0018] Figure 3 This is a structural diagram of the positioning mandrel.
[0019] Figure 4 Schematic diagram of the structure of the part to be tested in the embodiment.
[0020] Figure 5 This is the structural diagram of the fastening rod.
[0021] Figure 6 This is the flange structure diagram.
[0022] Figure 7 This is a diagram of the elbow clamp structure.
[0023] Figure 8 This is the structural diagram of the positioning plate.
[0024] In the figure: 1 pneumatic chuck; 2 positioning mandrel; 3 part to be tested; 4 fastening rod; 5 flange; 6 servo motor; 7 slide rail; 8 toggle clamp; 9 positioning plate; 3-1 is a control system part; 3-2 is the inner ring of the bearing; 3-3 is the outer ring of the bearing. DETAILED DESCRIPTION
[0025] The following Figure 4 Taking the part 3 to be tested as an example, the specific implementation of the present utility model is further explained in combination with the drawings and technical solutions. Figure 4 The part to be tested 3 includes a control system part 3-1, a bearing inner ring 3-2, and a bearing outer ring 3-3. The middle part of the control system part 3-1 is a disc structure, one side is an ear structure with an inner hole for installing the bearing, and the other side is a columnar structure.
[0026] This embodiment provides a positioning fixture for detecting the rotational flexibility of a bearing after it is fixed. The positioning fixture includes a pneumatic chuck 1, a positioning mandrel 2, a fastening rod 4, a flange 5, a servo motor 6, a slide rail 7, a toggle clamp 8, a positioning plate 9 and a retaining spring. Figure 2 shown.
[0027] The pneumatic chuck 1 is fixed on the operating platform by a bracket so that the axis of its jaw part is horizontal. The pneumatic chuck 1 includes three jaws, and the jaw clamping surface is an arc surface, which forms a cylindrical surface when closed, and is used to clamp the positioning core shaft 2.
[0028] like Figure 3 As shown, the positioning core shaft 2 is a four-section stepped shaft, the first section is used to be clamped in the three jaws of the pneumatic chuck 1, the outer diameter of the second section is larger than the first section, and the step between the two sections is used for positioning the end face of the jaws of the pneumatic chuck 1, the outer diameter of the third section is between the inner hole diameter of the bearing inner ring 3-2 on the part to be measured and the inner hole diameter of the bearing outer ring 3-3, which is used to avoid the external structure of the part to be measured 3, the fourth section of the positioning core shaft 2 is provided with an external thread, the outer diameter of the thread is matched with the inner hole clearance of the bearing inner ring 3-2 on the part to be measured 3, the end of the fourth section is set to be tapered, which is used for guiding when penetrating into the inner hole of the bearing of the part to be measured 3, and after penetration, the end face of the bearing inner ring 3-2 is fitted on the step surface between the third and fourth sections of the positioning core shaft 2.
[0029] like Figure 8As shown, the positioning plate 9 is vertically fixed on the operating platform and is located below the positioning core shaft 2. A positioning groove is provided on the upper part of the positioning plate 9 according to the shape of the part to be measured 3, so that the part to be measured 3 can be embedded in the groove to achieve positioning. After embedding, the bearing protrudes above the top of the positioning plate 9, and the inner ring 3-2 of the bearing penetrates into the fourth section of the positioning core shaft 2. At the same time, the position and shape of the positioning plate 9 are coordinated with the shape of the part to avoid interference with the positioning core shaft 2 and other structures during operation.
[0030] like Figure 7 As shown, the standard part 8 is fixed on the positioning plate 9, and its jaws are improved into a U-shape according to the shape of the part to be measured 3. The U-shaped mouth cooperates with the disc structure of the part to be measured 3 so that the jaws fit on the part to be measured 3. The elbow clamp 8 provides a clamping force by bending the wrench to clamp the part to be measured 3 on the positioning plate 9.
[0031] The slide rail 7 is a standard component, fixed on the other side of the positioning plate 9 on the operating platform, and arranged along the axis direction of the positioning core shaft 2.
[0032] The servo motor 6 is a standard component, which is installed on the slider of the slide rail 7 and is used to provide torque. Its main axis extends toward the positioning core shaft 2 and is coaxial with the positioning core shaft 2.
[0033] like Figure 6 As shown, the middle section of the flange 5 is a disc, and a coaxial circular boss is provided in the center of one side of the disc, and an inner hole and a groove are provided on the circular boss, which is used to be inserted into the main shaft of the servo motor 6 and is coaxial, fastened to the main shaft of the servo motor 6 by bolts and rotates synchronously, and a coaxial thin cylinder is provided in the center of the other side of the disc, and the thin cylinder has a groove and an inner hole along the axis for inserting and fitting the fastening rod 4, and an annular groove is provided at the end of the thin cylinder, and the fastening rod 4 is fixed by a retaining spring.
[0034] like Figure 5 As shown, the main body of the fastening rod 4 is cylindrical, and one end thereof is provided with protrusions on both sides along the radial direction, which is used to be inserted into the inner hole and groove of the thin cylinder of the flange 5 so that the two are coaxial and rotate synchronously. The other end of the fastening rod 4 is provided with an internal thread, which is used to cooperate with the external thread of the fourth section of the positioning core shaft 2 to clamp the two end faces of the bearing inner ring of the part to be tested 3.
[0035] The use process of the positioning fixture is as follows:
[0036] First, insert the part 3 to be tested onto the positioning core shaft 2 and embed it into the groove of the positioning plate 9, and fix it with the toggle clamp 8. At this time, the end face of the bearing inner ring 3-2 fits the stepped surface between the third and fourth sections of the positioning core shaft 2.
[0037] Then control the servo motor 6 to operate, driving the flange 5 and the fastening rod 4 to rotate. At the same time, start the slide rail 7 to drive the fastening rod 4, the flange 5 and the servo motor 6 to move toward the positioning core shaft 2, so that the fastening rod 4 is screwed to the fourth section of the positioning core shaft 2 and threadedly clamped to the two end faces of the bearing inner ring 3-2 on the part to be tested 3.
[0038] At this time, the servo motor 6 can provide a larger torque to drive the bearing inner ring 3-2 of the part to be tested 3 to rotate.
[0039] The above-described embodiments merely express the implementation methods of the present invention, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention.
Claims
1. A positioning fixture for detecting the rotational flexibility of a bearing after it is fixed, characterized in that: The positioning fixture comprises a pneumatic chuck (1), a positioning mandrel (2), a fastening rod (4), a flange (5), a servo motor (6), a slide rail (7), a toggle clamp (8), and a positioning plate (9); The pneumatic chuck (1) is fixed on the operating platform so that the axis of its jaw part is in a horizontal state, and the jaw clamping surface is an arc surface, which forms a cylindrical surface after closing; The positioning core shaft (2) is a four-section stepped shaft, the first section is used to be clamped in the three claws of the pneumatic chuck (1), the second section has a larger outer diameter than the first section, and the step between the two sections is used to locate with the end face of the claw of the pneumatic chuck (1), the third section has an outer diameter between the inner diameter of the inner ring of the bearing on the part to be measured (3) and the inner diameter of the outer ring, and the fourth section is provided with an external thread, the outer diameter of the thread is matched with the inner hole clearance of the inner ring of the bearing on the part to be measured (3), and after the inner ring is inserted, the end face of the inner ring of the bearing fits on the stepped surface of the third and fourth sections; The positioning plate (9) is vertically fixed on the operating platform and is located below the positioning core shaft (2). The upper part of the positioning plate (9) is provided with a positioning groove according to the shape of the part to be measured (3), which is used for the part to be measured (3) to be embedded in the groove to achieve positioning. After embedding, the bearing protrudes above the top of the positioning plate (9), and the inner ring of the bearing penetrates the fourth section of the positioning core shaft (2); The toggle clamp (8) is fixed on the positioning plate (9), and the part to be tested (3) is clamped on the positioning plate (9) by providing a pressing force by turning the wrench; The slide rail (7) is fixed on the other side of the positioning plate (9) on the operating platform and is arranged along the axis direction of the positioning core shaft (2); The servo motor (6) is mounted on a slide block of a slide rail (7), and its main axis extends toward the positioning core shaft (2) and is coaxial with the positioning core shaft (2); The middle section of the flange (5) is a disc, and a coaxial circular boss is provided at the center of one side of the disc for coaxial fixation and synchronous rotation with the main shaft of the servo motor (6); a coaxial thin cylinder is provided at the center of the other side of the disc, and the thin cylinder has a slot and an inner hole along the axis for insertion and matching of the fastening rod (4); The main body of the fastening rod (4) is cylindrical, and one end thereof is provided with protrusions on both sides along the radial direction, which is used to be inserted into the inner hole and groove of the thin cylinder of the flange (5) so that the two can be coaxial and rotate synchronously. The other end of the fastening rod (4) is provided with an internal thread, which is used to cooperate with the external thread of the fourth section of the positioning core shaft (2) to clamp the two end faces of the bearing inner ring of the part to be tested (3).
2. A positioning fixture for detecting the rotational flexibility of a bearing after fixation according to claim 1, characterized in that: The fourth end of the positioning mandrel (2) is configured to be tapered, and is used for guiding when penetrating into the inner hole of the bearing of the part to be tested (3).
3. A positioning fixture for detecting the rotational flexibility of a bearing after fixation according to claim 1, characterized in that: The jaws of the elbow clamp (8) are improved according to the shape of the part to be measured (3) so that it fits on the part to be measured (3).
4. A positioning fixture for detecting the rotational flexibility of a bearing after fixation according to claim 1, characterized in that: The thin cylindrical end of the flange (5) is provided with an annular groove, and the fastening rod (4) is fixed by a clamping spring.