Clamping device for alternating loading test of thin-wall part
By designing a fixed retaining ring and a guide block, the problems of loosening, slippage, and deformation of the clamping device in alternating loading tests of thin-walled parts were solved, achieving uniform distribution of clamping force and free expansion and contraction in the axial direction, thus improving test efficiency and accuracy.
Patent Information
- Application Number
- CN202423112379.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-17
AI Technical Summary
In existing alternating load tests on thin-walled parts, clamping devices suffer from problems such as loose and slipping jaws, severe friction, deformation, inability of the clamping device to freely extend and retract during rotation, and easy deformation of thin-walled parts, which affect the efficiency and accuracy of testing.
A fixed retaining ring and guide block structure was designed. The fixed retaining ring is a half-shaft structure. The guide block and the half-connecting shaft are fitted by a keyway. The front and rear ends of the guide block are positioned with the limit block and the chuck seat by the stop and the front and rear end faces of the guide block. There is a gap between the fixed retaining ring and the limit block and the chuck seat in front of the guide block. An elastic element is installed in the gap to achieve uniform distribution of clamping force and flexible adaptation to the extension and contraction of the axial direction.
This method achieves uniform distribution of clamping force in alternating loading tests for thin-walled components, preventing loosening and slippage, adapting to axial expansion and contraction, improving test efficiency and measurement accuracy, and protecting the thin-walled components from deformation.
Smart Images
Figure CN223623984U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mechanical testing, specifically relating to a clamping device for alternating loading tests on thin-walled parts. Background Technology
[0002] In recent years, people have paid increasing attention to the reliability and safety of connecting components and equipment. For mature mechanical components, accelerated life tests are also conducted on connecting components to verify the safety and reliability of the connecting parts in order to ensure safer and more reliable operation.
[0003] Accelerated life testing is a research hotspot in the fields of reliability mathematics and reliability engineering. It uses methods such as shortening the cycle time to accelerate the life test of the specimen, and uses a shorter test time to simulate the product test conditions of several years or even decades. This effectively improves test efficiency, reduces test costs, and makes it possible to evaluate the reliability of long-life products.
[0004] In the accelerated life test of the connection performance of shaft parts, the following problems were found in the clamping components of the shaft test pieces:
[0005] 1) To realistically simulate the current state of the connecting components, the parts should be able to freely expand and contract in the axial direction during rotation, without any other restrictions.
[0006] 2) For test pieces with thin walls, insufficient locking force of the locking claws can cause slippage at the locking points, resulting in noticeable friction marks on the contact surface when the claws rotate. Excessive locking force can easily cause significant deformation of the test piece, failing to protect the customer's property.
[0007] 3) For alternating loading (which can be understood as forward and reverse rotation conditions), frequent alternating loading often causes the chuck to loosen and slip, which greatly affects the testing efficiency and interferes with the measurement accuracy. Summary of the Invention
[0008] The purpose of this utility model is to solve the above-mentioned technical problems and provide a clamping device for alternating loading tests of thin-walled parts that is extremely simple in structure, safe and reliable, easy to disassemble and assemble, has good clamping force and will not cause deformation of the specimen, and can flexibly adapt to the axial extension and contraction during the rotation of the specimen.
[0009] The technical solution includes a semi-connecting shaft and a chuck seat mounted on the semi-connecting shaft. The chuck seat is provided with multiple jaws evenly distributed along the circumference. It also includes a fixing ring that can be mounted on the end of a thin-walled part. The jaws are connected to the fixing ring via a connecting fixing block.
[0010] The half-connecting shaft is also fitted with a fixed limiting block and a guide block located between the fixed limiting block and the chuck seat. The guide block and the half-connecting shaft are fitted with a keyway.
[0011] The width of the guide block is greater than the width of the keyway, so that there is a gap between the keyway and the fixed limiting blocks and chuck seat on both sides.
[0012] An elastic element is installed within the gap.
[0013] The front and rear end faces of the guide block are positioned by a stop and a fixed limit block and a chuck seat, respectively.
[0014] The guide block is connected to the fixed limit block and the chuck seat by bolts.
[0015] The fixing ring is a split structure, consisting of an upper split ring and a lower split ring connected by bolts.
[0016] The fixing ring is provided with a plurality of recessed stops evenly distributed along its circumference, and the lower end of the connecting fixing block is provided with a convex stop that is inserted into the recessed stops.
[0017] One side of the connecting fixing block is provided with a recessed stop that corresponds to the claw for insertion.
[0018] The connecting fixing block and the claw are connected by bolts.
[0019] To address the problems existing in the background technology, the inventors made the following improvements:
[0020] 1) A retaining ring was designed and fitted onto the thin-walled component. The clamping force of the jaws is dispersed through the retaining ring to form a uniform annular fastening force, which enhances the local strength of the thin-walled test component and can withstand greater clamping force from the jaws. This further increases the friction between the retaining ring and the thin-walled test component, preventing loosening or slippage of the clamping parts during testing. It also avoids the problem of local deformation of the thin-walled component caused by excessive local locking force due to direct clamping of the jaws. The retaining ring is preferably a half-ring structure, with the upper and lower half-rings locked by bolts. The jaws are connected to the retaining ring via a stop joint through a connecting fixing block, which facilitates disassembly and positioning and improves testing efficiency.
[0021] 2) The guide block is provided with a keyway that matches the half-connecting shaft. When the half-connecting shaft is driven to rotate by an external force, the torque is transmitted through the keyway, so that the guide block rotates synchronously. When the rotation speed of the half-connecting shaft changes or rotates in the opposite direction, the keyway connection can perfectly adapt to the torque change and transmit it synchronously. When the guide block rotates, it can slide on the keyway of the half-connecting shaft, flexibly adapting to the situation of free expansion and contraction of the axis direction during the rotation of the test piece under alternating loading conditions.
[0022] 3) The front and rear end faces of the guide block are respectively positioned by the stop and the fixed limiting block and the chuck seat, and the three are fixed as one piece. They can rotate and slide freely with the guide block. Since the width of the guide block is greater than the width of the keyway, there is a gap between the keyway and the fixed limiting blocks and the chuck seat on both sides. The existence of the gap not only meets the space requirement for the guide block to slide on the keyway, but also cleverly limits the sliding distance of the guide block in both directions to prevent the guide block from coming off the half connecting shaft. Furthermore, an elastic element is installed in the gap. When the force that causes the guide block to shift disappears, it can be reset under the action of the elastic element.
[0023] This utility model has an extremely simple structure, is safe and reliable, easy to assemble and disassemble, has good clamping force and will not cause specimen deformation, and can flexibly adapt to the expansion and contraction of the axial direction during the rotation of the specimen. It is particularly suitable for alternating loading tests on thin-walled parts and can effectively improve test efficiency and measurement accuracy. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the clamping device structure;
[0025] Figure 2 Schematic diagram of the retaining ring structure;
[0026] Figure 3 for Figure 1 Partial schematic diagram of AA;
[0027] Figure 4 for Figure 1 Partial schematic diagram of BB in the middle;
[0028] Figure 5 Connect the main view of the positioning block;
[0029] Figure 6 This is a diagram showing the clamping device of this utility model in use.
[0030] Among them, 1-half connecting shaft, 2-fixed limiting block, 3-guide block, 4-chuck seat, 5-claw, 5-1-convex stop, 6-connecting positioning block, 6-1-fixed screw hole, 6-2-concave stop, 6-3-convex stop, 7-thin-walled test piece, 8-fixed retaining ring, 8-1-upper Haver ring, 8-2-lower Haver ring, 8-3-concave stop, 9-elastic element, 10-keyway, 11-gap. Detailed Implementation
[0031] The present invention will be further explained below with reference to the accompanying drawings:
[0032] See Figure 1This embodiment includes a semi-connecting shaft 1, and a fixing limiting block 2, a guide block 3, and a chuck seat 4 sequentially mounted on the semi-connecting shaft 1. The chuck seat 4 is evenly provided with multiple jaws 5 (three in this embodiment; the extension and retraction positions of the jaws 5 are adjustable, for example, multiple jaws 5 can move synchronously through a gear transmission mechanism, suitable for products of different specifications). The jaws 5 are inserted into a fixing ring 8 via a connecting fixing block 6. For details, see [link to documentation]. Figure 2 The fixing ring 8 can be a split structure, consisting of an upper split ring 8-1 and a lower split ring 8-2 connected by bolts.
[0033] See Figure 3 In one embodiment, the guide block 3 and the half-connecting shaft 1 are fitted with a keyway 10. When the half-connecting shaft 1 is driven to rotate by an external force, torque is transmitted through the keyway, causing the guide block 3 to rotate synchronously. Viewed axially, the width of the guide block 3 is greater than the width of the keyway 10, resulting in a gap 11 between the keyway 10 and the fixed limiting blocks 2 and chuck seat 4 on both sides. An elastic element 9 is installed within the gap 11.
[0034] In another embodiment, the front and rear end faces of the guide block 3 are positioned with the fixed limiting block 2 and the chuck seat 4 respectively through the stop and are fixedly connected by bolts, and can rotate or move axially together with the guide block 3.
[0035] In another embodiment, the retaining ring 8 has a plurality of recessed stops 8-3 evenly distributed circumferentially (the specific number corresponds to the number of claws 5), the lower end of the connecting fixing block 6 has a convex stop 6-3 that corresponds to the recessed stops 8-3 and inserts into it, and one side of the connecting fixing block 6 has a recessed stop 6-2 that corresponds to the claws 5 and inserts into it, and the two are also connected by bolts. When the rotation direction or speed changes, the torque can be reliably transmitted through the stop connection.
[0036] Installation and testing of the device of this utility model
[0037] (1) Installation of fixing ring
[0038] The thin-walled test specimen 7 is suspended in the air. The upper Haver ring 8-1 and the lower Haver ring 8-2 of the fixing ring 8 are connected into a whole ring with connecting bolts. The fixing ring 8 is fitted onto the outer circle of the end face of the thin-walled test specimen 7. The connecting bolts on the fixing ring 8 are locked to fix the fixing ring 8 to one end of the thin-walled test specimen 7.
[0039] (2) Assemble the clamping device.
[0040] The guide block 3 is inserted into the detection part of the half-connecting shaft 1, and the elastic component 9 is installed into the groove between the guide block 3 and the half-connecting shaft 1. The fixed limit block 2 and the chuck seat 4 are respectively installed at both ends of the guide block 3 and fixed as a whole with connecting bolts. The chuck 5 is installed on the chuck seat 4, and the clamping range of the chuck 5 is adjusted to the required size through the transmission mechanism (such as gear transmission).
[0041] (3) Installation of thin-walled test specimens
[0042] Hoist the thin-walled test piece 7 along with the retaining ring 8 onto the clamping device. Adjust the clamping jaw 5 to align with the recessed stop 8-3 of the retaining ring 8. Push the connecting positioning block 6 horizontally from the recessed stop 8-3, ensuring that the end face of the convex stop 6-3 of the connecting positioning block 6 is against the end face of the recessed stop of the retaining ring 8 and that the recessed stop of the connecting positioning block 6 is engaged with the convex stop 5-1 of the clamping jaw 5. Fix the connecting positioning block 6 onto the clamping jaw 5 with bolts through the fixing screw hole 6-1 to complete the installation.
[0043] See Figure 1 The clamping device of this utility model is symmetrically installed at both ends of the thin-walled test piece 7, and the semi-connecting shaft 1 rotates synchronously to complete the test together.
[0044] When the rotational speed of the semi-connecting shaft 1 changes or rotates in the opposite direction, the keyway 10 can perfectly adapt to the torque change and transmit it synchronously to the guide block 3. When the guide block 3 rotates, it transmits the applied torque to the thin-walled test piece 7 through the jaw 5, the connecting positioning block 6, and the fixing ring 8, so that the thin-walled test piece 7 rotates or reverses synchronously.
[0045] During rotation, when the thin-walled test piece 7 undergoes flexible deformation due to high rotational speed, resulting in elongation or shortening, the axial expansion and contraction force is transmitted through the fixing ring 8 to the connecting positioning block 6 and the jaw 5, and finally fed back to the guide block 3. Due to the presence of the gap 11, the guide block 3 can be displaced axially along the keyway of the semi-connecting shaft 1. When the thin-walled test piece 7 operates smoothly, the deformation disappears, and the guide block 3 returns to normal under the action of the elastic element 9 and the axial force. This allows for free axial expansion and contraction of the thin-walled test piece 7 during the test, simulating actual operating conditions.
[0046] The contact surface between the retaining ring 8 and the thin-walled test piece 7 is much larger than that of the direct clamping method of the jaws 5. This not only disperses the clamping force of the jaws 5 and prevents the thin-walled test piece 7 from deforming, but also strengthens the local strength of the thin-walled test piece 7, allowing it to withstand a greater clamping force from the jaws 5. This further increases the friction between the retaining ring 8 and the thin-walled test piece 7, preventing the clamping parts from loosening or slipping during the test.
[0047] This invention solves the problems of free expansion and contraction of the axial direction of the test piece during rotation under alternating loading conditions, easy deformation of thin-walled test pieces, and easy loosening and slippage of the clamping jaws. The clamping device has a simple structure, reliable performance, and wide applicability. After long-term experimental verification by our company, the clamping device is suitable for alternating loading tests of thin-walled parts, with safe and reliable performance and no other damage to the test piece.
Claims
1. A clamping device for alternating loading tests on thin-walled parts, comprising a semi-connecting shaft and a chuck seat mounted on the semi-connecting shaft, wherein the chuck seat is uniformly provided with a plurality of jaws along the circumferential direction, characterized in that, It also includes a retaining ring that can be fitted onto the end of a thin-walled component, wherein the claw is inserted into the retaining ring via a connecting fixing block.
2. The clamping device for alternating loading tests on thin-walled parts as described in claim 1, characterized in that, The half-connecting shaft is also fitted with a fixed limiting block and a guide block located between the fixed limiting block and the chuck seat. The guide block and the half-connecting shaft are fitted with a keyway.
3. The clamping device for alternating loading tests on thin-walled parts as described in claim 2, characterized in that, The width of the guide block is greater than the width of the keyway, so that there is a gap between the keyway and the fixed limiting blocks and chuck seat on both sides.
4. The clamping device for alternating loading tests on thin-walled parts as described in claim 3, characterized in that, An elastic element is installed within the gap.
5. The clamping device for alternating loading tests on thin-walled parts as described in claim 2, characterized in that, The front and rear end faces of the guide block are positioned by a stop and a fixed limit block and a chuck seat, respectively.
6. The clamping device for alternating loading tests on thin-walled parts as described in claim 5, characterized in that, The guide block is connected to the fixed limit block and the chuck seat by bolts.
7. The clamping device for alternating loading tests on thin-walled parts as described in any one of claims 1-6, characterized in that, The fixing ring is a split structure, consisting of an upper split ring and a lower split ring connected by bolts.
8. The clamping device for alternating loading tests on thin-walled parts as described in any one of claims 1-6, characterized in that, The fixing ring is provided with a plurality of recessed stops evenly distributed along its circumference, and the lower end of the connecting fixing block is provided with a convex stop that is inserted into the recessed stops.
9. The clamping device for alternating loading tests on thin-walled parts as described in claim 7, characterized in that, One side of the connecting fixing block is provided with a recessed stop that corresponds to the claw for insertion.
10. The clamping device for alternating loading tests on thin-walled parts as described in claim 9, characterized in that, The connecting fixing block and the claw are connected by bolts.