Tension tester with balanced stress

Abstract

The utility model discloses a tension tester with balanced stress, which comprises a tension disc, a tension sensor, a tension driving device and a tension clamping device, the tension disc is arranged at one end of the tension sensor, and the tension clamping device is arranged on the tension driving device; the tension disc is provided with a plurality of clamping grooves which are used for fixing wires and are different in size, the clamping grooves are distributed in a clamping ring on the periphery of the tension disc at intervals, the sizes of the clamping grooves are distributed along the circumference of the clamping ring in an arithmetic progression mode, the clamping ring is divided into a plurality of check blocks, and the arc lengths of the check blocks between every two clamping grooves are also distributed in an arithmetic progression mode. In other words, the perimeter of the clamping ring is set to be C, and C = 2pi r; the width of the clamping groove is set to be Hn, and Hn = H1 + (n-1) * d1; the arc length of the check block is set to be Ln, and Ln = L1 + (n-1) * d2; r is the radius of the clamping ring, n is a positive integer, H1 is the width of the first clamping groove, d1 is the tolerance of the clamping groove, L1 is the arc length of the first check block, d2 is the tolerance of the check blocks, and d1 is equal to d2.

Description

Technical field:

[0001] The utility model relates to the field of tensile testing, in particular to a tensile testing instrument with balanced force. Background technology:

[0002] During the industrial manufacturing process, assembled finished or semi-finished products need to be subjected to tensile testing to determine whether the product can withstand the required tensile force and to detect the maximum tensile force the product can withstand. This is especially true for the connection between wires and terminals. In some equipment with a certain workload, such as motors, a stable connection between wires and terminals can ensure the service life of the equipment.

[0003] Tensile testers are currently commonly used on the market to test the tensile strength of wires. For example, Chinese Patent Authorization Publication No. CN 214668159 U discloses an automatic wire harness terminal tensile testing machine. In this patented solution, a terminal chuck 2 is used to secure the terminal at one end of the wire. The other end of the wire is clamped by a wire harness clamping mechanism, which pulls the wire away from the terminal chuck 2, thereby performing a tensile test on the terminal. To enable tensile testing of different wire terminals, multiple retaining slots are often provided on the terminal chuck 2, such as Chinese Patent Authorization Publication No. CN 212722024 U discloses a tensile testing fixture for tubular terminals. Because the retaining slots on current test fixtures on the market are typically evenly distributed, the maximum tensile force that the test fixture can withstand is the same regardless of the terminal being tested. This results in uneven force applied to different areas of the test fixture during tensile testing of different terminals, which can eventually cause deformation and damage to the test fixture over time.

[0004] In view of this, the inventors propose the following technical solutions. Utility model content:

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a tensile tester with balanced force.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions: a force-balanced tensile tester, comprising: a tensile plate, a tensile sensor, a tensile drive device, and a tensile clamping device, wherein the tensile plate is arranged at one end of the tensile sensor, and the tensile clamping device is arranged on the tensile drive device;

[0007] The tension disk is provided with a plurality of different-sized clamping grooves for fixing wires. The clamping grooves are spaced apart on the clamping ring on the periphery of the tension disk, and the sizes of the clamping grooves are distributed along the circumference of the clamping ring in an arithmetic progression. The clamping ring is divided into a number of blocks, and the arc length of the block between two clamping grooves is also distributed in an arithmetic progression, that is:

[0008] Set the circumference of the locking ring to C, C = 2πr;

[0009] Set the width of the slot to Hn, Hn = H1 + (n-1) × d1;

[0010] Set the arc length of the stopper to Ln, Ln = L1 + (n-1) × d2;

[0011] In the above, r is the radius of the locking ring, n is a positive integer, H1 is the width of the first locking groove, d1 is the tolerance of the locking groove, L1 is the arc length of the first stopper, d2 is the tolerance of the stopper, and d1=d2.

[0012] Furthermore, in the above technical solution, Hn+Ln≤C, that is: H1+(n-1)×d1+L1+(n-1)×d2≤2πr.

[0013] Furthermore, in the above technical solution, the tension disk includes a disk seat for fixing the tension sensor and a stopper arranged on the periphery of the disk seat and used to clamp and fix the product, and the stopper is formed with multiple clamping grooves of different shapes and sizes.

[0014] Furthermore, in the above technical solution, the disc seat and the stopper are both made of stainless steel.

[0015] Furthermore, in the above technical solution, one end of the tension sensor is installed and fixed through a support frame, which includes a first vertical plate and a second vertical plate located on both sides, and a support beam arranged between the first vertical plate and the second vertical plate and used to install the tension sensor. The front end of the tension sensor is provided with a U-shaped seat for supporting the tension disk, and the tension disk is installed on the U-shaped seat through a bolt column.

[0016] Furthermore, in the above technical solution, a first longitudinal positioning groove for positioning the tension sensor is provided in the middle of the support beam, and a first mounting hole for a bolt to pass through and be fixed to the tension sensor is provided in the first longitudinal positioning groove.

[0017] Furthermore, in the above technical solution, the rear ends of the first vertical plate and the second vertical plate are respectively provided with a first notch and a second notch for installing the support beam.

[0018] Furthermore, in the above technical solution, a control circuit board is further provided on the side of the first vertical plate or the second vertical plate, and a power driver is further provided on the side of the support frame. The power driver and the circuit board are respectively located on both sides of the support frame.

[0019] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: the present invention sets the width of the positioning slot on the block in the form of an arithmetic progression, and divides the block according to the arithmetic progression consistent with the positioning slot. This makes the blocks on both sides of the positioning slot with a large width reserved wider and able to withstand greater force, while the blocks on both sides of the positioning slot with a small width reserved narrower and only need to withstand smaller force. In this way, it can be ensured that the positioning slot can withstand sufficient tensile stress when performing terminal tension testing on thicker wire harnesses, and more types of positioning slots can be arranged, greatly improving the versatility of the tension disk. Secondly, by setting up the layout in this way, it can be ensured that the stress inside the tension disk is always balanced during each force measurement, and local fatigue will not occur, thereby ensuring the service life of the tension disk. Description of the drawings:

[0020] Figure 1 It is a structural diagram of the utility model;

[0021] Figure 2 This is a schematic diagram of the installation of the tension plate of the utility model;

[0022] Figure 3 This is an exploded view of the support frame of the utility model;

[0023] Figure 4 This is an exploded view of the tension clamping device in the utility model;

[0024] Figure 5 It is an internal sectional view of the tension clamping device in the utility model. Specific implementation method:

[0025] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0026] See Figures 1 to 5 As shown, a force-balanced tension tester includes a tension disk 1, a tension sensor 2, a tension drive device 3, and a tension clamping device 4, wherein the tension disk 1 is arranged at one end of the tension sensor 2, and the tension clamping device 4 is arranged on the tension drive device 3; the tension disk 1 is provided with a plurality of clamping grooves 13 of different sizes for fixing wires, and the clamping grooves 13 are spaced apart on the clamping ring outside the tension disk 1, and the sizes of the clamping grooves 13 are distributed along the circumference of the clamping ring in an arithmetic progression, and the clamping ring is divided into a plurality of blocks 12, and the arc lengths of the blocks 12 between two clamping grooves 13 are also distributed in an arithmetic progression, that is:

[0027] Set the circumference of the locking ring to C, C = 2πr;

[0028] The width of the positioning slot 13 is set to Hn, Hn=H1+(n-1)×d1;

[0029] The arc length of the stopper 12 is set to Ln, Ln = L1 + (n-1) × d2;

[0030] In the above, r is the radius of the locking ring, n is a positive integer, H1 is the width of the first locking groove, d1 is the tolerance of the locking groove, L1 is the arc length of the first stopper, d2 is the tolerance of the stopper, and d1=d2.

[0031] The width of the positioning slot 13 is set on the block 12 in the form of an arithmetic progression, and the block 12 is divided according to the arithmetic progression consistent with the positioning slot 13. This makes the block 12 on both sides of the positioning slot 13 with a large width reserved wider, and can withstand greater force, while the block 12 on both sides of the positioning slot 13 with a small width reserved narrower, only needing to withstand smaller force. In this way, it can be ensured that the positioning slot 13 can withstand sufficient tensile stress when performing terminal tension testing on thicker wire harnesses, and more types of positioning slots 13 can be arranged, greatly improving the versatility of the tension disk 1. Secondly, by setting up the layout in this way, it can be ensured that the stress inside the tension disk 1 is always balanced during each force measurement, and local fatigue will not occur, thereby ensuring the service life of the tension disk 1.

[0032] The above Hn+Ln≤C, that is: H1+(n-1)×d1+L1+(n-1)×d2≤2πr. In one embodiment, H1 is 2mm, L1 is 4mm, d1 and d2 are 2mm, and r is 50mm. Of course, in actual processing, it is not necessary to process the positioning grooves 13 completely according to the arithmetic progression. By reserving narrower blocks 12 on both sides of the positioning grooves 13 with smaller sizes and wider blocks 12 on both sides of the positioning grooves 13 with larger sizes, it is also possible to ensure that the tension disk 1 is subjected to balanced force in response to different wiring harnesses.

[0033] The tension plate 1 includes a plate base 11 for securing the tension sensor 2, and a stopper 12 disposed around the plate base 11 for securing the product. The stopper 12 is formed with multiple retaining grooves 13 of varying shapes and sizes. Both the plate base 11 and the stopper 12 are made of stainless steel. Using stainless steel for the plate base 11 and retaining ring 12 not only facilitates processing and production, but also offers high strength, rust resistance, a long service life, and low cost, significantly reducing enterprise costs.

[0034] One end of the tension sensor 2 is installed and fixed by a support frame 5, which includes a first vertical plate 51 and a second vertical plate 52 located on both sides, and a support beam 53 arranged between the first vertical plate 51 and the second vertical plate 52 and used to install the tension sensor 2. The front end of the tension sensor 2 is provided with a U-shaped seat 6 for supporting the tension disk 1, and the tension disk 1 is installed on the U-shaped seat 6 through a bolt column 7.

[0035] A first longitudinal positioning groove 531 is provided in the middle of the support beam 53 for positioning the tension sensor 2, and a first mounting hole 532 is provided in the first longitudinal positioning groove 531 for a bolt to pass through and fix to the tension sensor 2. A first notch 511 and a second notch 521 are provided at the rear ends of the first and second vertical plates 51 and 52, respectively, for mounting the support beam 53.

[0036] A control circuit board 8 is further provided on the side of the first vertical plate 51 or the second vertical plate 52 , and a power driver 54 is further provided on the side of the support frame 5 . The power driver 54 and the circuit board 8 are respectively located on both sides of the support frame 5 .

[0037] The tension clamping device 4 includes a positioning plate 41 installed on the moving seat 31, a toggle wheel 42 and a follower wheel 43 hingedly installed on the positioning plate 41 and used to cooperate with the clamping product, a connecting block 44 provided on the positioning plate 41 and used to link the toggle wheel 42 with the follower wheel 43, and a first positioning pin 45 and a second positioning pin 46 that respectively limit the connecting block 44 to the toggle wheel 42 and the follower wheel 43, wherein the toggle wheel 42 and the follower wheel 43 are eccentrically hinged to the positioning plate 41, the first positioning pin 45 and the second positioning pin 46 are also eccentrically connected to the toggle wheel 42 and the follower wheel 43, and the connecting block 44 is provided with a first travel groove 441 and a second travel groove 442 that respectively match the first positioning pin 45 and the second positioning pin 46. In the tension clamping device 4, a first positioning pin 45 and a second positioning pin 46 are used to connect the link block 44 with the toggle wheel 42 and the follower wheel 43, and the toggle wheel 42 and the follower wheel 43 are eccentrically hinged to the positioning plate 41 respectively. When the user pushes the toggle wheel 42 to produce eccentric swing, the toggle wheel 42 will push the link block 44 to slide through the first positioning pin 45 when it swings. When the link block 44 slides, it will drive the follower wheel 43 to swing through the second positioning pin 46, so that when the user pushes the toggle wheel 42 to swing, the follower wheel 43 will also swing accordingly. Since the link block 44 is provided with a first travel groove 441 and a second travel groove 442 for limiting the first positioning pin 45 and the second positioning pin 46, when the toggle wheel 4 When the toggle wheel 42 swings away from the follower wheel 43, the follower wheel 43 also swings synchronously away from the dial wheel 42, thereby creating a clamping gap between the toggle wheel 42 and the follower wheel 43, facilitating the placement of the product between the toggle wheel 42 and the follower wheel 43. When the toggle wheel 42 swings toward the follower wheel 43, the follower wheel 43 also swings synchronously toward the toggle wheel 42, thereby achieving the toggle wheel 42 and the follower wheel 43 to cooperate in clamping the product. During the product stretching process, the toggle wheel 42 and the follower wheel 43 are pulled closer together due to the tension, thereby achieving stable clamping of the product and preventing it from falling off. In addition, the toggle wheel 42 and the follower wheel 43 are provided with embossing to increase friction to prevent the product from slipping during the stretching process. Of course, in one embodiment, both the toggle wheel 42 and the follower wheel 43 are equipped with torsion springs, and the return torque generated by the torsion springs keeps the toggle wheel 42 and the follower wheel 43 in a constant tendency to move closer together.

[0038] To sum up, when the present invention is working, the tension disk 1 is locked and installed on the cantilever beam 6 by the bolt column 7, and one end of the product is fixed on the tension disk 1, such as: the terminal welded at one end of the wiring harness is locked into the slot 13 of the tension disk 1; further, the toggle wheel 42 is pushed to separate the toggle wheel 42 and the follower wheel 43, and after the product is straightened, the other end of the product is placed between the toggle wheel 42 and the follower wheel 43, and then the toggle wheel 42 is released. Under the action of the torsion spring, the toggle wheel 42 and the follower wheel 43 move closer to clamp the other end of the product; further, under the action of the tension driving device 3, the tension clamping device 4 drives the product away from the tension disk 1, and as the tension clamping device 4 moves, the clamping force on the product will increase to prevent the product from falling off, and when the tension disk 1 is pulled by the product, the force The tension sensor 2 is applied to the tension sensor 2, which tests the tension that the product can withstand. Further, when it is necessary to test whether the product meets the design tension, the tension sensor 2 detects that the tension reaches the design requirement and feeds back to the control circuit board 8, which controls the tension drive device 3 to stop working and return to the initial position. When testing the ultimate tension of the product, the tension drive device 3 continuously pulls the product until the product breaks. At this time, the maximum value recorded by the tension sensor 2 is the ultimate tension that the product can withstand. When the tension sensor 2 detects that the tension decreases after reaching the maximum value, it is determined that the product has broken. At this time, the control circuit board 8 feeds back to the control circuit board 8, which controls the tension drive device 3 to stop working and return to the initial position. Finally, the product is removed and replaced with a new product to continue testing.

[0039] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made based on the structure, features and principles described in the scope of the patent application of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A force-balanced tensile tester comprising a tensile plate (1), a tensile sensor (2), a tensile drive device (3), and a tensile clamping device (4), wherein: The tension disk (1) is arranged at one end of the tension sensor (2), and the tension clamping device (4) is arranged on the tension driving device (3); the characteristics are: The tension disk (1) is provided with a plurality of different-sized clamping grooves (13) for fixing wires. The clamping grooves (13) are spaced apart on a clamping ring on the periphery of the tension disk (1), and the sizes of the clamping grooves (13) are distributed along the circumference of the clamping ring in an arithmetic progression. The clamping ring is divided into a plurality of stoppers (12), and the arc lengths of the stoppers (12) between two clamping grooves (13) are also distributed in an arithmetic progression, that is: Set the circumference of the locking ring to C, C = 2πr; The width of the positioning slot (13) is set to Hn, Hn=H1+(n-1)×d1; The arc length of the stopper (12) is set to Ln, Ln = L1 + (n-1) × d2; In the above, r is the radius of the locking ring, n is a positive integer, H1 is the width of the first locking groove, d1 is the tolerance of the locking groove, L1 is the arc length of the first stopper, d2 is the tolerance of the stopper, and d1=d2.

2. A force-balanced tensile tester according to claim 1, characterized in that: The Hn+Ln≤C, that is: H1+(n-1)×d1+L1+(n-1)×d2≤2πr.

3. The force-balanced tensile tester according to claim 1, characterized in that: The tension disk (1) comprises a disk seat (11) for fixing the tension sensor (2) and a stopper (12) arranged on the periphery of the disk seat (11) and used for locking and fixing the product. The stopper (12) is formed with a plurality of locking grooves (13) of different shapes and sizes.

4. The force-balanced tensile tester according to claim 3, characterized in that: The disc seat (11) and the stopper (12) are both made of stainless steel.

5. A force-balanced tensile tester according to any one of claims 1 to 4, characterized in that: One end of the tension sensor (2) is fixedly mounted via a support frame (5), the support frame (5) comprising a first vertical plate (51) and a second vertical plate (52) located on both sides, and a support beam (53) disposed between the first vertical plate (51) and the second vertical plate (52) and used for mounting the tension sensor (2); a U-shaped seat (6) for supporting a tension disk (1) is disposed at the front end of the tension sensor (2), and the tension disk (1) is mounted on the U-shaped seat (6) via a bolt column (7).

6. The force-balanced tensile tester according to claim 5, characterized in that: A first longitudinal positioning groove (531) for positioning the tension sensor (2) is provided in the middle of the support beam (53), and a first mounting hole (532) for a bolt to pass through and be fixed to the tension sensor (2) is provided in the first longitudinal positioning groove (531).

7. The force-balanced tensile tester according to claim 5, characterized in that: The rear ends of the first vertical plate (51) and the second vertical plate (52) are respectively provided with a first notch (511) and a second notch (521) for installing a support beam (53).

8. The force-balanced tensile tester according to claim 5, characterized in that: A control circuit board (8) is also provided on the side of the first vertical plate (51) or the second vertical plate (52), and a power driver (54) is also provided on the side of the support frame (5). The power driver (54) and the circuit board (8) are respectively located on both sides of the support frame (5).

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