A device and method for testing fatigue performance of round link chain

Abstract

The present invention discloses a device and method for testing the fatigue performance of a round link chain, and belongs to the technical field of fatigue testing. The present invention realizes the rapid connection and fixation of the round link chain and the hydraulic universal testing machine through two sets of two sets of hanging components symmetrically hung in the chain rings at both ends of the round link chain and externally connected to the hydraulic universal testing machine, and realizes the stable transmission of the loading force, that is, the loading force of the hydraulic universal testing machine is sequentially transmitted to the round link chain through the jaw seat, the clamping plate and the V-shaped clamping block. The present invention can realize the rapid connection and fixation of the round link chain and the hydraulic universal testing machine, ensure the smooth progress and accurate measurement of the fatigue test of the round link chain, improve the success rate and accuracy of the fatigue test, and has the advantages of stable force transmission, automatic centering, accurate testing, avoiding damage to the round link chain, high efficiency, high success rate, easy installation, safe operation, flexible use, strong versatility, and low cost.

Description

Technical Field

[0001] The invention relates to the technical field of fatigue testing, and in particular to a device and method for testing the fatigue performance of a round-link chain. Background Art

[0002] Round link chains are widely used in the fields of navigation, mining, industrial cranes, etc. Before use, the round link chains need to be tested for fatigue performance, because the quality of the round link chain fatigue performance is directly related to production safety. At present, there are two main test methods for testing the fatigue performance of round link chains: the first is to directly clamp the end links of the round link chain. Since the cross section of the round link chain is circular, this clamping method is easy to slip during the fatigue test, and it is easy to appear misalignment or pulling during the loading process. The test success rate is low and it is difficult to obtain accurate data; the second is to use a pin to pass through the two end links of the round link chain respectively, and apply force to the pin. Although the test success rate is high, due to the various types and sizes of the links of the round link chains in different fields, it is necessary to make the corresponding pins and overall clamping tooling, which is too costly and complicated to disassemble and assemble. Therefore, in view of the defects of the above two clamping methods, it is now necessary to design a new device and method for testing the fatigue performance of the round link chain to realize the rapid connection and fixation of the round link chain and the hydraulic universal testing machine, thereby ensuring the smooth progress and accurate measurement of the round link chain fatigue test. Summary of the invention

[0003] The purpose of the present invention is to provide a device and method for testing the fatigue performance of a round link chain in view of the deficiencies in the above-mentioned prior art. The present invention can realize the rapid connection and fixation of the round link chain and the hydraulic universal testing machine, ensure the smooth progress and accurate measurement of the round link chain fatigue test, improve the success rate and accuracy of the fatigue test, and has the advantages of stable force transmission, automatic centering, accurate testing, avoiding damage to the round link chain, high efficiency, high success rate, easy installation, safe operation, flexible use, strong versatility, and low cost.

[0004] The purpose of the present invention can be achieved by the following technical measures:

[0005] The device for testing the fatigue performance of a round link chain of the present invention is composed of two sets of hanging components for symmetrically hanging the two end links of the round link chain and externally connected to a hydraulic universal testing machine (the hanging components are used to realize the rapid connection and fixation of the round link chain and the hydraulic universal testing machine, and realize the stable transmission of the loading force - the loading force of the hydraulic universal testing machine is transmitted to the round link chain in sequence through a jaw seat, a clamping plate and a V-shaped clamping block); the hanging components all include a quadrangular pyramid structure with an isosceles trapezoidal cross section, and a jaw seat with three upper and lower stepped grooves composed of an n-shaped groove, a middle flat groove and an open groove that are connected in sequence from the inside to the outside as seen from the cross section direction (the jaw seat serves as the hanging base and installation basis of the utility model; the open groove It is convenient for the round link chain to be freely placed, and the round link chain is prevented from contacting the jaw seat during the test), a card plate embedded in the middle flat groove (the card plate is used to embed and support the V-shaped card block; the middle flat groove is used to embed and position the card plate), a V-shaped card block built into the n-shaped groove and embedded in the card plate (the V-shaped card block is used to hang the end chain link of the round link chain; the n-shaped groove is used for the built-in V-shaped card block); the card plate is a rectangular structure with a U-shaped groove in the center along the width of the plate, and an arc-shaped card groove for embedding the V-shaped card block is processed at the upper edge of the side wall of the bottom of the U-shaped groove (the arc-shaped card groove is used in conjunction with the U-shaped groove to embed the V-shaped card block, and can realize automatic centering of the V-shaped card block and the round link chain).

[0006] The n-type groove, the middle flat groove and the open groove in the present invention are all through grooves arranged along the longitudinal direction of the jaw seat (to facilitate the installation of the card plate and the V-shaped card block, and to facilitate the hanging of the round link chain); the width of the n-type groove is smaller than the width of the middle flat groove (to smoothly embed the card plate), and the width of the n-type groove is larger than the width of the open groove (to ensure that the inner end face of the open groove supports the card plate, which is convenient for the transmission of pulling force).

[0007] The width of the clamping plate described in the present invention is consistent with the width of the middle flat groove (realizing the positioning and automatic centering of the clamping plate, V-shaped clamping block, and round link chain in the width direction), and the length of the clamping plate and the length of the middle flat groove are equal to the length of the jaw seat (realizing the positioning and automatic centering of the clamping plate, V-shaped clamping block, and round link chain in the length direction).

[0008] In the present invention, the spherical centers of the two arc-shaped slots are located on both the mid-section plane in the length direction of the card plate and the mid-section plane in the width direction of the card plate (ensuring self-alignment of the spherical centers of the arc-shaped slots with the card plate, and then ensuring self-alignment of the V-shaped block with the jaw seat, and ultimately achieving self-alignment of the chain links at both ends of the circular chain).

[0009] The V-shaped clamp block in the present invention is a V-shaped structure formed by bending round steel; the arc-shaped clamping groove matches the outer contour of the V-shaped clamp block (when loading, the outer contour of the V-shaped clamp block is closely fitted with the arc-shaped clamping groove to achieve stable force transmission and ensure the accuracy of the test results).

[0010] A method for detecting the fatigue performance of a round link chain of the present invention is achieved by the following steps:

[0011] A. Select the V-shaped blocks and plates of the corresponding specifications according to the specifications of the round link chain;

[0012] B. Determine the number of links of the round link chain according to the test requirements;

[0013] C. First, place the two jaw seats in the upper and lower beams of the hydraulic universal testing machine respectively, and adjust the positions of the upper and lower beams to ensure that the two jaw seats are centered and the spacing matches the length of the round link chain to be tested;

[0014] D. Insert the two clamps into the middle flat grooves of the two jaw seats respectively, so that the front and rear end surfaces of the clamps are flush with the front and rear end surfaces of the jaw seats;

[0015] E. Then, pass the two V-shaped blocks through the two end links of the round link chain respectively, and then put the two V-shaped blocks into the n-shaped grooves of the two jaw seats respectively, and move along the n-shaped grooves until the V-shaped blocks are embedded in the arc-shaped grooves of the clamping plate, and the V-shaped blocks, the clamping plate and the jaw seats are automatically aligned;

[0016] F. Start the hydraulic universal testing machine, increase the distance between the upper and lower beams, and make the V-shaped block and the card plate fit tightly together;

[0017] G. Input relevant test parameters into the hydraulic universal testing machine, start loading for fatigue testing, and observe and record the test results.

[0018] The design principle of the present invention is as follows:

[0019] The present invention realizes the rapid connection and fixation of the round link chain and the hydraulic universal testing machine through two sets of hanging components which are symmetrically hung in the chain links at both ends of the round link chain and externally connected to the hydraulic universal testing machine, thereby realizing the stable transmission of the loading force - that is, the loading force of the hydraulic universal testing machine is transmitted to the round link chain through the jaw seat, the clamping plate and the V-shaped clamping block in sequence, thereby ensuring the smooth progress and accurate measurement of the round link chain fatigue test and improving the success rate and accuracy of the fatigue test.

[0020] More specifically, the two V-shaped blocks are respectively installed in the two end links of the circular chain and are respectively hung in the arc-shaped slots of the cardboard. When the hydraulic universal testing machine applies a loading force to the jaw seat, the loading force is transmitted to the cardboard embedded in the middle flat slot of the jaw seat through the jaw seat, and the cardboard transmits the loading force to the V-shaped block through the arc-shaped slot, and the V-shaped block transmits the loading force to the circular chain. It has the advantages of stable force transmission, accurate testing, avoiding damage to the circular chain, high efficiency, high success rate, safe operation, and flexible use. When the hydraulic universal testing machine drives the two jaw seats to move in opposite directions up and down, it will drive the cardboard, V-shaped block, and the end chain ring of the circular chain at the corresponding end to move in the same direction. The V-shaped block and the cardboard gradually close together to achieve gapless fit and transmit a large loading force. It has the advantages of stable force transmission, accurate testing, high efficiency, and high success rate. At the same time, the card plate is inserted into the middle flat groove, the V-shaped card block is embedded in the arc-shaped card groove and can move freely along the n-shaped groove and the U-shaped groove, and the end chain ring of the round ring chain can move freely along the open groove, which has the advantages of easy installation and flexible use. Since the width of the card plate is consistent with the width of the middle flat groove, the card plate, the V-shaped card block, and the round ring chain can be positioned and automatically centered in the width direction; since the length of the card plate and the length of the middle flat groove are equal to the length of the jaw seat, the card plate, the V-shaped card block, and the round ring chain can be positioned and automatically centered in the length direction; since the spherical centers of the two arc-shaped card grooves are located on both the middle cutting plane in the length direction of the card plate and the middle cutting plane in the length direction of the card plate, the spherical centers of the arc-shaped card grooves can be self-centered with the card plate, and then the V-shaped card block and the jaw seat can be self-centered, and finally the self-centering of the chain rings at both ends of the round ring chain can be achieved. Therefore, the present invention has the advantages of automatic centering, high efficiency, high success rate, avoiding damage to the round ring chain, avoiding eccentricity, and avoiding slipping. In addition, the utility model can select corresponding V-shaped blocks and clamping plates according to the specifications of the round link chain to be tested, and can adapt to the testing needs of fatigue performance of round link chains of various specifications. It has the advantages of strong versatility, flexible use and low cost.

[0021] The beneficial technical effects of the present invention are as follows:

[0022] The present invention can realize the rapid connection and fixation of the round link chain and the hydraulic universal testing machine, ensure the smooth progress and accurate measurement of the round link chain fatigue test, improve the success rate and accuracy of the fatigue test, and has the advantages of stable force transmission, automatic centering, accurate testing, avoiding damage to the round link chain, high efficiency, high success rate, easy installation, safe operation, flexible use, strong versatility and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the structure of the present invention (the circular ring chain in the figure is a representative figure, and the actual number of chain links is not less than 3).

[0024] Figure 2 It is a structural schematic diagram of the jaw seat.

[0025] Figure 3 It is a structural diagram of the pallet.

[0026] Figure 4 It is a structural schematic diagram of a V-type card block.

[0027] Serial numbers in the figure: 1, jaw seat, 1-1, n-shaped groove, 1-2, middle flat groove, 1-3, open groove, 2, clamping plate, 2-1, U-shaped groove, 2-2, arc-shaped clamping groove, 3, round link chain, 4, V-shaped clamping block. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0029] like Figure 1 to Figure 4 As shown, a device for testing fatigue performance of a round link chain of the present invention is composed of two sets of hanging components that symmetrically hang the two end links of the round link chain 3 and are externally connected to a hydraulic universal testing machine (the hanging components are used to realize the rapid connection and fixation of the round link chain and the hydraulic universal testing machine, and realize the stable transmission of the loading force - the loading force of the hydraulic universal testing machine is transmitted to the round link chain 3 in sequence through the jaw seat 1, the clamping plate 2 and the V-shaped clamping block 4); the hanging components all include a quadrangular pyramid structure with an isosceles trapezoidal cross section, and a jaw seat 1 with three upper and lower stepped grooves formed by an n-shaped groove 1-1, a middle flat groove 1-2 and an open groove 1-3 that are connected in sequence from the inside to the outside as seen from the cross-sectional direction (the jaw seat 1 serves as the hanging base and installation basis of the utility model; the open groove 1-3 is convenient for the round link chain 3 to be freely placed, During the test, the round link chain 3 is prevented from contacting the jaw seat 1), a card plate 2 is embedded in the middle flat groove 1-2 (the card plate 2 is used to embed and support the V-shaped block 4; the middle flat groove 1-2 is used to embed and position the card plate 2), and a V-shaped block 4 is built into the n-shaped groove 1-1 and embedded in the card plate 2 (the V-shaped block 4 is used to hang the end chain link of the round link chain 3; the n-shaped groove 1-1 is used for the built-in V-shaped block 4); the card plate 2 is a rectangular parallelepiped structure with a U-shaped groove 2-1 opened in the center along the width direction of the plate, and an arc-shaped groove 2-2 for embedding the V-shaped block 4 is processed at the upper edge of the side wall of the bottom of the U-shaped groove 2-1 (the arc-shaped groove 2-2 is used in conjunction with the U-shaped groove 2-1 to embed the V-shaped block 4, and can realize automatic centering of the V-shaped block 4 and the round link chain 3).

[0030] The n-type groove 1-1, the middle flat groove 1-2, and the open groove 1-3 described in the present invention are all through grooves arranged along the longitudinal direction of the jaw seat 1 (facilitating the installation of the card plate 2 and the V-shaped card block 4, and facilitating the hanging of the round link chain 3); the width of the n-type groove 1-1 is smaller than the width of the middle flat groove 1-2 (smoothly embedding the card plate 2), and the width of the n-type groove 1-1 is larger than the width of the open groove 1-3 (ensuring that the inner end surface of the open groove 1-3 supports the card plate 2, facilitating the transmission of pulling force).

[0031] The width of the clamping plate 2 described in the present invention is consistent with the width of the middle flat groove 1-2 (realizing the positioning and automatic centering of the clamping plate 2, the V-shaped clamping block 4, and the round link chain 3 in the width direction), and the length of the clamping plate 2 and the length of the middle flat groove 1-2 are equal to the length of the jaw seat 1 (realizing the positioning and automatic centering of the clamping plate 2, the V-shaped clamping block 4, and the round link chain 3 in the length direction).

[0032] In the present invention, the spherical centers of the two arc-shaped slots 2-2 are located on both the mid-section of the length direction of the card plate 2 and the mid-section of the width direction of the card plate 2 (ensuring self-alignment of the spherical centers of the arc-shaped slots 2-2 with the card plate 2, thereby ensuring self-alignment of the V-shaped block 4 with the jaw seat 1, and ultimately achieving self-alignment of the chain links at both ends of the circular chain 3).

[0033] The V-shaped block 4 in the present invention is a V-shaped structure formed by bending round steel; the arc-shaped slot 2-2 matches the outer contour of the V-shaped block 4 (when loading, the outer contour of the V-shaped block 4 is closely fitted with the arc-shaped slot 2-2 to achieve stable force transmission and ensure the accuracy of the test results). Embodiment 1

[0034] A method for detecting fatigue performance of a round link chain in embodiment 1 is implemented by the following steps:

[0035] A. The specification of the round link chain (3 to be tested is 10×40 and the total length is 1m. According to the specification of the round link chain (3, a V-shaped block (4) with a diameter of 20mm and a corresponding matching specification of the card plate (2 are selected;

[0036] B. Determine the number of links of the round link chain (3) according to the test requirements;

[0037] C. First, place the two jaw seats 1 in the upper and lower beams of the hydraulic universal testing machine respectively, and adjust the positions of the upper and lower beams to ensure that the positions of the two jaw seats 1 are centered and the spacing matches the length of the round link chain 3 to be tested;

[0038] D. Insert the two clamping plates 2 into the middle flat grooves 1-2 of the two jaw seats 1 respectively, so that the front and rear end surfaces of the clamping plates 2 are flush with the front and rear end surfaces of the jaw seats 1;

[0039] E. Then, the two V-shaped clamping blocks 4 are respectively passed through the two end links of the round link chain 3, and then the two V-shaped clamping blocks 4 are respectively placed in the n-shaped grooves 1-1 of the two jaw seats 1, and moved along the n-shaped grooves 1-1 until the V-shaped clamping blocks 4 are embedded in the arc-shaped clamping grooves 2-2 of the clamping plate 2, and the V-shaped clamping blocks 4 are automatically aligned with the clamping plate 2 and the jaw seat 1;

[0040] F. Start the hydraulic universal testing machine, increase the distance between the upper and lower beams, and make the V-shaped block 4 and the card plate 2 tightly combined;

[0041] G. Input relevant test parameters into the hydraulic universal testing machine - set the upper limit of the test fatigue load to 65kN, the lower limit to 8kN, the loading frequency to 5Hz, the loading speed to 200 times / min, and the number of cycles to 30,000 times, start loading for fatigue test, observe and record the test results - after 30,000 cycles of loading, the round link chain 3 is intact and not broken. Embodiment 2

[0042] A method for detecting fatigue performance of a round link chain in the second embodiment is implemented by the following steps:

[0043] A. The specification of the round link chain 3 to be tested is 42×152 and the total length is 1.1m. According to the specification of the round link chain 3, a V-shaped block 4 with a diameter of 85mm and a card plate 2 of corresponding matching specifications are selected;

[0044] B. Determine the number of links of the round link chain 3 according to the test requirements;

[0045] C. First, place the two jaw seats 1 in the upper and lower beams of the hydraulic universal testing machine respectively, and adjust the positions of the upper and lower beams to ensure that the positions of the two jaw seats 1 are centered and the spacing matches the length of the round link chain 3 to be tested;

[0046] D. Insert the two clamping plates 2 into the middle flat grooves 1-2 of the two jaw seats 1 respectively, so that the front and rear end surfaces of the clamping plates 2 are flush with the front and rear end surfaces of the jaw seats 1;

[0047] E. Then, the two V-shaped clamping blocks 4 are respectively passed through the two end links of the round link chain 3, and then the two V-shaped clamping blocks 4 are respectively placed in the n-shaped grooves 1-1 of the two jaw seats 1, and moved along the n-shaped grooves 1-1 until the V-shaped clamping blocks 4 are embedded in the arc-shaped clamping grooves 2-2 of the clamping plate 2, and the V-shaped clamping blocks 4 are automatically aligned with the clamping plate 2 and the jaw seat 1;

[0048] F. Start the hydraulic universal testing machine, increase the distance between the upper and lower beams, and make the V-shaped block 4 and the card plate 2 tightly combined;

[0049] G. Input relevant test parameters into the hydraulic universal testing machine - set the upper limit of the test fatigue load to 914 kN, the lower limit to 138 kN, the loading frequency to 5 Hz, the loading speed to 1000 times / min, and the number of cycles to 30,000 times, start loading for fatigue testing, observe and record the test results - after 245.7 million cycles of loading, the round link chain 3 broke. Embodiment 3

[0050] A method for detecting fatigue performance of a round link chain in embodiment 3 is implemented by the following steps:

[0051] A. The specification of the round link chain 3 to be tested is 26×92 and the total length is 1m. According to the specification of the round link chain 3, a V-shaped block 4 with a diameter of 55mm and a card plate 2 of corresponding matching specifications are selected;

[0052] B. Determine the number of links of the round link chain 3 according to the test requirements;

[0053] C. First, place the two jaw seats 1 in the upper and lower beams of the hydraulic universal testing machine respectively, and adjust the positions of the upper and lower beams to ensure that the positions of the two jaw seats 1 are centered and the spacing matches the length of the round link chain 3 to be tested;

[0054] D. Insert the two clamping plates 2 into the middle flat grooves 1-2 of the two jaw seats 1 respectively, so that the front and rear end surfaces of the clamping plates 2 are flush with the front and rear end surfaces of the jaw seats 1;

[0055] E. Then, the two V-shaped clamping blocks 4 are respectively passed through the two end links of the round link chain 3, and then the two V-shaped clamping blocks 4 are respectively placed in the n-shaped grooves 1-1 of the two jaw seats 1, and moved along the n-shaped grooves 1-1 until the V-shaped clamping blocks 4 are embedded in the arc-shaped clamping grooves 2-2 of the clamping plate 2, and the V-shaped clamping blocks 4 are automatically aligned with the clamping plate 2 and the jaw seat 1;

[0056] F. Start the hydraulic universal testing machine, increase the distance between the upper and lower beams, and make the V-shaped block 4 and the card plate 2 tightly combined;

[0057] G. Input relevant test parameters into the hydraulic universal testing machine - set the upper limit of the test fatigue load to 265kN, the lower limit to 53kN, the loading frequency to 5Hz, the loading speed to 500 times / min, and the number of cycles to 34, start loading for fatigue test, observe and record the test results - after 40,000 cycles of loading, the round link chain 3 is intact and not broken.

Claims

1. A device for testing the fatigue performance of round link chains, Features: The device is composed of two sets of hanging components, the two end links of a symmetrical hanging circular chain (3) and the external connection of a hydraulic universal testing machine; the hanging components all include a four-sided pyramid structure with an isosceles trapezoidal cross section, and a jaw seat (1) with three upper and lower stepped grooves, which are connected from the inside to the outside in sequence, an n-shaped groove (1-1), a middle flat groove (1-2), and an open groove (1-3) in the cross section direction; a clamping plate (2) embedded in the middle flat groove (1-2); and a V-shaped clamping block (4) built in the n-shaped groove (1-1) and embedded in the clamping plate (2); the clamping plate (2) is a rectangular plate with a U-shaped groove (2-1) opened in the center along the width direction of the plate. The invention relates to a body structure, wherein an arc-shaped clamping groove (2-2) for clamping a V-shaped clamping block (4) is processed at the upper edge of the groove bottom side wall of the U-shaped groove (2-1); the n-shaped groove (1-1), the middle flat groove (1-2), and the open groove (1-3) are all through grooves arranged along the longitudinal direction of the jaw seat (1); the width of the n-shaped groove (1-1) is smaller than the width of the middle flat groove (1-2), and the width of the n-shaped groove (1-1) is larger than the width of the open groove (1-3); the width of the clamping plate (2) is consistent with the width of the middle flat groove (1-2), and the length of the clamping plate (2) and the length of the middle flat groove (1-2) are both equal to the length of the jaw seat (1).

2. A device for testing the fatigue performance of a round link chain according to claim 1, Features: The spherical centers of the two arc-shaped clamping grooves (2-2) are located both on the mid-section of the clamping plate (2) in the length direction and on the mid-section of the clamping plate (2) in the width direction.

3. A device for testing the fatigue performance of a round-link chain according to claim 1, Features: The V-shaped clamping block (4) is a V-shaped structure formed by bending round steel; the arc-shaped clamping groove (2-2) matches the outer contour of the V-shaped clamping block (4).

4. A method for using the device for testing the fatigue performance of a round-link chain according to claim 1, Features: The method is implemented by the following steps: A. Select V-shaped clamping block (4) and clamping plate (2) of corresponding specifications according to the specifications and models of the round link chain (3); B. Determine the number of links of the round link chain (3) according to the test requirements; C. First, place the two jaw seats (1) in the upper and lower beams of the hydraulic universal testing machine respectively, and adjust the positions of the upper and lower beams to ensure that the two jaw seats (1) are centered and the spacing between them matches the length of the round link chain (3) to be tested; D. Insert the two clamping plates (2) into the middle flat grooves (1-2) of the two jaw seats (1) respectively, so that the front and rear end surfaces of the clamping plates (2) are flush with the front and rear end surfaces of the jaw seats (1); E. Then, the two V-shaped clamping blocks (4) are respectively passed through the two end links of the round link chain (3), and then the two V-shaped clamping blocks (4) are respectively placed in the n-shaped grooves (1-1) of the two jaw seats (1), and moved along the n-shaped grooves (1-1) until the V-shaped clamping blocks (4) are embedded in the arc-shaped clamping grooves (2-2) of the clamping plate (2), and the V-shaped clamping blocks (4) are automatically aligned with the clamping plate (2) and the jaw seat (1); F. Start the hydraulic universal testing machine and increase the distance between the upper and lower beams so that the V-shaped clamping block (4) and the clamping plate (2) are tightly combined; G. Input relevant test parameters into the hydraulic universal testing machine, start loading for fatigue testing, and observe and record the test results.

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