Device and method for efficiently testing compression joint inhaul cable load holding test

Abstract

According to the device and method for the efficient test of the compression joint inhaul cable load holding test, uniform balance of stress of the compression joint inhaul cables on the left side and the right side is achieved through the pulleys and the balance inhaul cables, measurement inaccuracy caused by the length difference of the compression joint inhaul cables is avoided, it is guaranteed that the stress states of the series connection inhaul cables are consistent through a series connection mode, and measurement accuracy is improved. Meanwhile, by matching with the concentric device provided by the invention, the axial load holding test state of a plurality of crimp cables to be tested can be well ensured, the stability and reliability of test data are ensured, the high-efficiency test problem of the load holding test of the crimp cables is well solved, the test efficiency is improved by more than 4 times, the test is accurate, the structure is stable and reliable, and the test cost is reduced. Operation is convenient, cost is low, and the applicable inhaul cable specification range is wide.

Description

Technical Field

[0001] This invention belongs to the field of component performance testing technology, specifically relating to an efficient testing device and method for the load-bearing test of compression cables. Background Technology

[0002] In actual production, the mechanical properties of the cable are verified using a guaranteed load test. The guaranteed load test involves applying a constant load to the cable and maintaining it for a certain time. After the holding time is up, the applied force is unloaded. Then, it is observed whether the cable's crimped joints are loose and whether any wires in the cable body are broken. If none of these issues occur, the cable's mechanical properties meet the requirements.

[0003] Taking a certain specification of crimped cable as an example, it needs to be subjected to a constant tensile force of 500N and held for 5 minutes to verify its mechanical properties. The traditional testing method is to fix the cable between the crossbeam and the fixed seat of the universal testing machine by using pins or hooks, and control the universal testing machine to perform a guarantee load test. The testing efficiency is low and it is not suitable for large-scale testing. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art by providing an apparatus and method for efficient testing of the load-bearing capacity of compression cables, thereby achieving efficient testing of the load-bearing capacity of compression cables.

[0005] The technical solution of this invention is: a device for efficient testing of the load-bearing capacity of compression-bonded cables, comprising: The upper connecting mechanism and the lower connecting mechanism are used to connect to both ends of the load-bearing test machine, respectively; The load-bearing bracket (2-1) is connected to the lower part of the upper connecting mechanism; A pulley (2-2) is rotatably mounted on the lower part of the load-bearing bracket (2-1); The balancing cable (3-1) is laid on the pulley (2-2), with its two ends hanging freely. Two test units are provided, each consisting of multiple test compression cables (3-2) connected in series via cable connecting hooks (3-3). In one test unit, the upper end of the multiple test compression cables (3-2) connected in series is connected to one end of the balance cable (3-1), and the lower end is connected to the lower connecting mechanism. In the other test unit, the upper end of the multiple test compression cables (3-2) connected in series is connected to the other end of the balance cable (3-1), and the lower end is connected to the lower connecting mechanism. Through the parallel structure formed by the pulley (2-2) and the balance cable (3-1), the load acting on the two test units is automatically balanced, and the load-bearing test of all test compression cables (3-2) in the test unit can be completed simultaneously.

[0006] Furthermore, the upper connecting mechanism is provided with a concentric mechanism, which enables the load-bearing bracket (2-1) to swing freely in the circumferential direction to ensure the axial force state of the multiple tested pressure cables (3-2).

[0007] Furthermore, the upper connecting mechanism includes an upper connecting base (1-1) and a concentric mechanism; The upper connecting base (1-1) is connected to the load testing machine; The concentric mechanism includes: The concentric seat (1-2) is a hollow cylindrical rotating body. Its upper part is threaded to the upper connecting base (1-1) and the relative position of the two is fixed by a radially arranged locking pin (1-5). The middle part has an inwardly protruding stepped hole with a diameter that matches the outer diameter of the concentric guide block (1-3). The lower part has an inwardly protruding stepped hole with a diameter larger than the outer diameter of the concentric connecting rod (1-4) to support the concentric guide block (1-3) and allow the concentric seat (1-2) to swing freely in the circumferential direction. A concentric guide block (1-3) is assembled inside the concentric seat (1-2), and its upper part has a concave spherical surface; The concentric connecting rod (1-4) has a convex spherical surface at its upper part that is adapted to the concave spherical surface, so as to achieve spherical contact with the concentric guide block (1-3); the outer diameter of the middle part is smaller than the inner diameter of the concentric guide block (1-3), so that the concentric connecting rod (1-4) can swing freely in the circumferential direction; the bottom is threadedly connected to the load-bearing bracket (2-1) and the relative position of the two is fixed by a radially arranged locking pin (2-4).

[0008] Furthermore, a sealed space for adding grease is formed between the upper connecting base (1-1) and the concentric base (1-2).

[0009] Furthermore, the lower connecting mechanism includes a lower connecting base (3-5) and a lower fixing hook (3-4); the lower fixing hook (3-4) is connected to the lower connecting base (3-5) by a thread and is used to connect the lowermost pressure cable (3-2) to be tested.

[0010] Furthermore, the cable connecting hook (3-3) is an S-shaped or C-shaped hook.

[0011] Furthermore, the pulley (2-2) is wheel-shaped, with a groove formed by an indentation in the middle of its outer circle, allowing the balance cable (3-1) to move along the groove.

[0012] Furthermore, each of the tested compression cables (3-2) in the test unit is a cable with different lengths.

[0013] The present invention also relates to a method for conducting a load-bearing test of a compression cable using the aforementioned device, comprising the following steps: S1: Connect the upper connecting mechanism of the device to the top of the testing machine and the lower connecting mechanism to the bottom of the testing machine; S2: Connect multiple test compression cables (3-2) in series through cable connecting hooks (3-3) to form two test units; S3: Connect the upper end of each test unit to one end of the balance cable (3-1) and the lower end to the lower connecting mechanism; S4: The control testing machine applies a guarantee load to all the tested compression cables (3-2) simultaneously through the device and maintains it for a specified time; S5: Unload the load and check the condition of the crimping parts of all the tested crimped cables (3-2).

[0014] The advantages of this invention compared to existing technologies are as follows: This invention cleverly utilizes pulleys and balancing cables to achieve uniform and balanced force on the left and right test crimping cables, avoiding measurement inaccuracies caused by differences in the length of the crimping cables. By using a series connection, it ensures consistent force on the series cables and significantly improves testing efficiency. Furthermore, the concentric device of this invention effectively guarantees the axial load-bearing test status of multiple tested crimping cables, ensuring stable and reliable test data. This invention effectively solves the problem of efficient testing of crimping cable load-bearing tests, increasing testing efficiency by more than four times. It is accurate, structurally stable and reliable, easy to operate, low in cost, and applicable to a wide range of cable specifications. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the press-fit cable structure of the present invention; Figure 2 This is a schematic diagram of the test device structure of the present invention. Detailed Implementation

[0016] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0017] like Figure 2 As shown, the device for efficient testing of the load-bearing capacity of crimped cables proposed in this invention includes an upper connecting base 1-1, a concentric base 1-2, a concentric guide block 1-3, a concentric connecting rod 1-4, a locking pin 1-5, a load-bearing bracket 2-1, a pulley 2-2, a pin 2-3, a locking pin 2-4, a balancing cable 3-1, a cable connecting hook 3-3, a lower fixing hook 3-4, and a lower connecting base 3-5. The crimped cable 3-2 is the test object, and its structure is as follows: Figure 1 As shown.

[0018] The upper connecting base 1-1 has a rotating structure with a pin hole in the center of the upper part for easy connection to the testing machine; there is a raised concentric ring in the middle, which, after assembly, forms a relatively sealed space with the concentric seat 1-2 for adding grease to ensure the sensitivity of the concentric mechanism; the lower part has an external thread, which connects to the concentric seat 1-2 through the thread, and a conical locking groove is opened at the same time. The locking pin 1-5 fixes the relative position of the upper connecting base 1-1 and the concentric seat 1-2 to ensure that the threaded connection between the two does not loosen.

[0019] The concentric seat 1-2 is a cylindrical rotating body, hollow, with internal threads on the upper part, which connect it to the upper connecting base 1-1 via the threads. It also has an internal threaded hole along the radial direction, with the thread specification matching the locking pin 1-5. The locking pin 1-5 fixes the relative position of the upper connecting base 1-1 and the concentric seat 1-2, ensuring that the threaded connection between the two is not loose. There is an inwardly protruding stepped hole in the middle, with the hole diameter matching the outer diameter of the concentric guide block 1-3. There is an inwardly protruding stepped hole at the bottom, with the hole diameter slightly larger than the outer diameter of the concentric connecting rod 1-4, which is used to support the concentric guide block 1-3 and allow the concentric seat 1-2 to swing freely in the circumferential direction.

[0020] The concentric guide block 1-3 is a rotary cylindrical shape, with an inner diameter slightly larger than the outer diameter of the concentric connecting rod 1-4. Its upper end is concave, forming a concave spherical surface, which is embedded within the concentric seat 1-2. It contacts the equal-diameter convex spherical surface on the upper part of the concentric connecting rod 1-4 through the concave spherical surface, allowing for flexible sliding. The concentric guide block 1-3 is made of a material with high hardness, good wear resistance, and strong compressive strength.

[0021] The concentric connecting rod 1-4 is a rotating body with a larger outer diameter at the top, forming a convex spherical surface that contacts the concave spherical surface of the concentric guide block 1-3, allowing for flexible sliding. The outer diameter at the middle is slightly smaller than the inner diameter of the concentric guide block 1-3, ensuring that the concentric connecting rod 1-4 can swing freely in the circumferential direction. It also has an external thread at the bottom, which connects to the load-carrying bracket 2-1. A conical locking groove is also provided, and the relative positions of the concentric connecting rod 1-4 and the load-carrying bracket 2-1 are fixed by the locking pin 2-4, ensuring that the threaded connection between the two does not loosen.

[0022] The locking pin 1-5 is a rotating structure with a conical end for precise positioning and a concave internal hexagonal structure on the other end face for easy locking. The entire cylindrical section of the locking pin 1-5 is threaded with external threads, which, through cooperation with the upper connecting base 1-1 and the concentric seat 1-2, ensures that the threaded engagement between the upper connecting base 1-1 and the concentric seat 1-2 is secure.

[0023] The load-carrying bracket 2-1 has an inverted "C" shape. The upper middle part has an internal threaded hole, which is connected to the concentric connecting rod 1-4 through the thread. The upper side has an internal threaded hole, which is used to fix the relative position of the concentric connecting rod 1-4 and the load-carrying bracket 2-1 by locking pin 2-4, ensuring that the threaded connection between the two is not loose. The lower "C" shape has symmetrical pin holes on both wings, into which pin 2-3 is inserted to connect the load-carrying bracket 2-1 and the pulley 2-2, and to allow the pulley 2-2 to rotate freely.

[0024] The pulley 2-2 is wheel-shaped, with a groove formed by an indentation in the middle of its outer circle, which allows the balance cable 3-1 to move along the groove on the outer edge of the wheel.

[0025] Pin 2-3 has a rotating structure. One end is conical to ensure easy insertion, and the other end has a raised step with an outer diameter slightly larger than the main diameter to facilitate the insertion of pin 2-3 into place.

[0026] The locking pin 2-4 is a rotating structure with a conical end for precise positioning and a concave internal hexagonal structure on the other end face for easy locking. The entire cylindrical section of the locking pin 2-4 is threaded externally, which, through cooperation with the concentric connecting rod 1-4 and the load-bearing bracket 2-1, ensures that the threaded engagement between the concentric connecting rod 1-4 and the load-bearing bracket 2-1 is secure and does not loosen.

[0027] The balancing cable 3-1 is a section of soft steel wire cable with connecting buckles at both ends. The forming method of the connecting buckles is, but is not limited to, crimping, bolting, etc. The overall strength of the cable and the connecting buckles is greater than that of the crimped cable 3-2 being tested.

[0028] The crimped cable 3-2 is a section of soft steel wire cable with connecting buckles at both ends. The forming methods of the connecting buckles include, but are not limited to, crimping and bolt fixing.

[0029] The cable connecting hook 3-3 is S-shaped or C-shaped and has high overall strength. The tested crimped cables 3-2 are connected in series by inserting the connecting buckles at both ends of the crimped cable 3-2.

[0030] The upper part of the lower fixing hook 3-4 is bent so that it can pass through the connecting buckles at both ends of the crimping cable 3-2. The lower part has external threads and is connected to the lower connecting base 3-5 through the threads.

[0031] The lower connecting base 3-5 is a cylindrical rotating body structure with a larger outer diameter at the top and an internal threaded hole on the upper end face, which is connected to the lower fixed hook 3-4 through the thread; the lower cylindrical section has a radial pin hole for easy connection to the testing machine.

[0032] In use, assemble the concentric guide block 1-3 with its concave spherical surface facing upwards into the concentric seat 1-2; pass the concentric connecting rod 1-4 with its threaded end facing downwards through the concentric guide block 1-3, ensuring that the concave spherical surface of the concentric seat 1-2 contacts the equal-diameter convex spherical surface on the upper part of the concentric connecting rod 1-4, allowing for flexible sliding; screw the upper connecting base 1-1 onto the concentric seat 1-2 via threads; screw the locking pin 1-5 into the internal threaded hole on the upper part of the concentric seat 1-2, tightening until the threads between the upper connecting base 1-1 and the concentric seat 1-2 are locked shut. Freely loosen; connect the load-carrying bracket 2-1 to the concentric connecting rod 1-4 via the upper internal thread and the lower external thread; screw the locking pin 2-4 into the upper internal thread hole of the load-carrying bracket 2-1, and tighten until the threads between the load-carrying bracket 2-1 and the concentric connecting rod 1-4 are locked and cannot be loosened freely; assemble the connected upper connecting base 1-1, concentric base 1-2, concentric guide block 1-3, concentric connecting rod 1-4, locking pin 1-5, load-carrying bracket 2-1, and locking pin 2-4 as a whole. Connect the upper connecting base 1-1 to the universal testing machine using pins; place the balance cable 3-1 into the groove on the outer edge of the pulley 2-2; insert the pin 2-3 into the pin hole at the lower part of the load-bearing bracket 2-1, connecting the load-bearing bracket 2-1 and the pulley 2-2 with the balance cable 3-1; connect the two lower fixing hooks 3-4 to the lower connecting base 3-5 using threads; connect the connected lower fixing hooks 3-4 and lower connecting base 3-5 to the testing machine using pins; adjust the position of the testing machine crossbeam appropriately, and... The upper parts of the two tested compression cables 3-2 are connected to the connecting buckles at both ends of the balance cable 3-1, and the lower parts are connected to the upper hooks of the two cable connecting hooks 3-3; the lower hooks of the two cable connecting hooks 3-3 are connected to the upper parts of the other two tested compression cables 3-2, and the lower parts of the other two tested compression cables 3-2 are respectively connected to the two lower fixed hooks 3-4; finally, a connection is formed by parallel connection of the balance cable 3-1 and series connection of two groups of two tested compression cables 3-2 in each group; the test load test can be completed by controlling the testing machine.

[0033] Taking the test of 24 crimped cables 3-2 with a load of 500N and a holding time of 5 minutes as an example, the traditional test method takes 5*24=120 minutes; the above test method takes 24 / 4*5=30 minutes, which is significantly better and improves efficiency by 4 times.

[0034] Similarly, if the parallel connection of the balance cable 3-1 is adopted, and the connection method of 3 tested compression cables 3-2 in each of the 2 groups is adopted, the test efficiency is increased by 6 times; if the parallel connection of the balance cable 3-1 is adopted, and the connection method of 4 tested compression cables 3-2 in each of the 2 groups is adopted, the test efficiency is increased by 8 times, which is a significant improvement in efficiency.

[0035] The contents not described in detail in this specification are common knowledge to those skilled in the art.

[0036] It is understood that this invention has been described through embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this invention.

Claims

1. A device for efficient testing of the load-bearing capacity of compression-bonded cables, characterized in that, include: The upper connecting mechanism and the lower connecting mechanism are used to connect to both ends of the load-bearing test machine, respectively; The load-bearing bracket (2-1) is connected to the lower part of the upper connecting mechanism; A pulley (2-2) is rotatably mounted on the lower part of the load-bearing bracket (2-1); The balancing cable (3-1) is laid on the pulley (2-2), with its two ends hanging freely. Two test units are provided, each consisting of multiple test compression cables (3-2) connected in series via cable connecting hooks (3-3). In one test unit, the upper end of the multiple test compression cables (3-2) connected in series is connected to one end of the balance cable (3-1), and the lower end is connected to the lower connecting mechanism. In the other test unit, the upper end of the multiple test compression cables (3-2) connected in series is connected to the other end of the balance cable (3-1), and the lower end is connected to the lower connecting mechanism. Through the parallel structure formed by the pulley (2-2) and the balance cable (3-1), the load acting on the two test units is automatically balanced, and the load-bearing test of all test compression cables (3-2) in the test unit can be completed simultaneously.

2. The device for high-efficiency testing of the load-bearing capacity of compression cables according to claim 1, characterized in that: The upper connecting mechanism is provided with a concentric mechanism, which allows the load-bearing bracket (2-1) to swing freely in the circumferential direction to ensure the axial force state of the multiple pressure cables (3-2) being tested.

3. The apparatus for high-efficiency testing of the load-bearing capacity of compression cables according to claim 1 or 2, characterized in that: The upper connecting mechanism includes an upper connecting base (1-1) and a concentric mechanism; The upper connecting base (1-1) is connected to the load testing machine; The concentric mechanism includes: The concentric seat (1-2) is a hollow cylindrical rotating body. Its upper part is threaded to the upper connecting base (1-1) and the relative position of the two is fixed by a radially arranged locking pin (1-5). The middle part has an inwardly protruding stepped hole with a diameter that matches the outer diameter of the concentric guide block (1-3). The lower part has an inwardly protruding stepped hole with a diameter larger than the outer diameter of the concentric connecting rod (1-4) to support the concentric guide block (1-3) and allow the concentric seat (1-2) to swing freely in the circumferential direction. A concentric guide block (1-3) is assembled inside the concentric seat (1-2), and its upper part has a concave spherical surface; The concentric connecting rod (1-4) has a convex spherical surface at its upper part that is adapted to the concave spherical surface, so as to achieve spherical contact with the concentric guide block (1-3); the outer diameter of the middle part is smaller than the inner diameter of the concentric guide block (1-3), so that the concentric connecting rod (1-4) can swing freely in the circumferential direction; the bottom is threadedly connected to the load-bearing bracket (2-1) and the relative position of the two is fixed by a radially arranged locking pin (2-4).

4. The apparatus for high-efficiency testing of the load-bearing capacity of compression cables according to claim 3, characterized in that: A sealed space for adding grease is formed between the upper connecting base (1-1) and the concentric base (1-2).

5. The apparatus for high-efficiency testing of the load-bearing capacity of compression cables according to claim 1, characterized in that: The lower connecting mechanism includes a lower connecting base (3-5) and a lower fixing hook (3-4); the lower fixing hook (3-4) is connected to the lower connecting base (3-5) by a thread and is used to connect the lowermost pressure cable (3-2) to be tested.

6. The apparatus for high-efficiency testing of the load-bearing capacity of compression cables according to claim 1, characterized in that: The cable connection hook (3-3) is an S-shaped or C-shaped hook.

7. The apparatus for high-efficiency testing of the load-bearing capacity of compression cables according to claim 1, characterized in that: The pulley (2-2) is wheel-shaped, with a groove formed by an indentation in the middle of its outer circle, allowing the balance cable (3-1) to move along the groove.

8. The apparatus for high-efficiency testing of the load-bearing capacity of compression cables according to claim 1, characterized in that: The test crimped cables (3-2) in the test unit are crimped cables with different lengths.

9. A method for conducting a cable-stayed test using the apparatus described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1: Connect the upper connecting mechanism of the device to the top of the testing machine and the lower connecting mechanism to the bottom of the testing machine; S2: Connect multiple test compression cables (3-2) in series through cable connecting hooks (3-3) to form two test units; S3: Connect the upper end of each test unit to one end of the balance cable (3-1) and the lower end to the lower connecting mechanism; S4: The control testing machine applies a guarantee load to all the tested compression cables (3-2) simultaneously through the device and maintains it for a specified time; S5: Unload the load and check the condition of the crimping parts of all the tested crimped cables (3-2).

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