Lifting appliance load test tool and test method

Abstract

The invention relates to a lifting appliance load test tool and a test method, belongs to the technical field of lifting appliance detection, and solves the technical problem that a heavy lifting appliance is difficult to carry out a load test, the lifting appliance is provided with a first end used for being connected with lifting equipment and a second end used for being connected with a lifted object, and the tool comprises a first seat body connected to the first end; the second seat body is connected to the second end; and the back shore assembly is mounted on the second seat body, and the back shore assembly is connected with the first seat body, so that static tension is applied between the first seat body and the second seat body by using the back shore assembly to carry out a load test on the lifting appliance. The tool is used in the method. Therefore, when the method is used for carrying out the load test on the lifting appliance, a heavy object with corresponding weight and lifting equipment do not need to be configured, so that the load test of the extra-heavy lifting appliance is easier to implement.

Description

Technical Field

[0001] The invention belongs to the technical field of sling detection, and in particular relates to a sling load test tool and a test method. Background Art

[0002] To ensure safety, the slings must undergo a load test before leaving the factory in order to detect the condition of the slings at the maximum load, especially for heavy slings used on construction sites, because the weight of the hoisted objects is very heavy, so load tests are even more necessary. Usually, the load test of the sling is to use the lifting equipment to lift the sling, and then hang the maximum weight of the load on the sling. However, this method cannot be applied to super-heavy loads. The reason is that the existing lifting equipment itself has a rated load limit and cannot lift super-heavy goods, and it is difficult to find test objects of matching weight on site.

[0003] For example, the rated load of a hoist required at a construction site is 871 tons, and the design requires a load test at 1.25 times the rated load. Therefore, a hoisting object of 1088.75 tons needs to be found during the test, and a hoisting equipment with a lifting weight of over 1,000 tons needs to be configured. The manufacturer cannot find such a heavy hoisting object and hoisting equipment. Therefore, this type of hoist cannot be load tested using conventional methods, and there is also a lack of reasonable solutions in the prior art to load test ultra-heavy hoists. Summary of the invention

[0004] The invention provides a sling load test tool and a test method, which are used to solve the technical problem that it is difficult to carry out a load test on an ultra-heavy sling.

[0005] The present invention is implemented by the following technical solution: a sling load test tool, the sling having a first end for connecting to a lifting device and a second end for connecting to a lifting object, comprising:

[0006] A first seat body connected to the first end;

[0007] A second seat body connected to the second end;

[0008] A top support assembly is installed on the second seat body, and the top support assembly is connected to the first seat body so as to utilize the top support assembly to apply static tension between the first seat body and the second seat body to perform a load test on the sling.

[0009] Further, in order to better realize the present invention, the lifting device includes a columnar member, two lifting arms and two load-bearing arms, the lifting arms and the load-bearing arms are both hinged to the columnar member, and the lifting arms and the load-bearing arms are respectively located on both sides of the columnar member, the ends of the two load-bearing arms away from the columnar member are both hinged to the support, the support constitutes the first end, the position of the lifting arm away from the columnar member is provided with a lifting hole, and the lifting holes of the two lifting arms constitute the second end;

[0010] The first seat body comprises a load-bearing seat and an articulated seat, wherein the articulated seat is arranged at one side of the load-bearing seat, the articulated seat is articulated with the support, and the load-bearing seat is movably placed between the two load-bearing arms;

[0011] The second seat body includes a mounting seat, a connecting seat and a connecting rod, the two ends of the connecting seat are respectively inserted into the lifting holes on the two lifting arms, the mounting seat is connected to the connecting seat through the connecting rod, the mounting seat is movably placed between the two load-bearing arms and is arranged opposite to the load-bearing seat, and the top support assembly is installed on the mounting seat and abuts against the load-bearing seat.

[0012] Furthermore, in order to better realize the present invention, the two ends of the connecting rod are respectively hinged to the mounting seat and the connecting seat, the number of the connecting rods is two, and a reinforcing rib is fixed between the two connecting rods. The connecting rod and the reinforcing rib form a connecting frame. The number of the connecting frames is two, and the two connecting frames are symmetrically placed on both sides of the columnar component.

[0013] Furthermore, in order to better implement the present invention, the top support assembly includes:

[0014] A plurality of jacks are installed on the mounting seat, and telescopic shafts of the plurality of jacks are in contact with the bearing seat.

[0015] Furthermore, in order to better implement the present invention, a boss is provided on the outer wall of one side of the mounting seat close to the load-bearing seat, and a plurality of mounting holes are opened on the boss. The plurality of mounting holes are evenly distributed on the boss, and a jack is installed in each mounting hole.

[0016] Furthermore, in order to better implement the present invention, a guide assembly is installed between the mounting seat and the bearing seat.

[0017] Further, in order to better implement the present invention, the direction between the first end and the second end is a first direction, and the extension and retraction direction of the jack is the first direction;

[0018] The guide assembly includes four guide rails extending along the first direction and sliders slidably mounted on the guide rails. The guide rails are bolted to the mounting seat by bolts. The four guide rails are evenly distributed around the force-bearing seat. Four centering blocks are provided on the outer wall of the force-bearing seat. Each of the centering blocks is provided with a slider. The four sliders are slidably connected to the four guide rails respectively.

[0019] The sling load test method provided by the present invention uses the sling load test tool mentioned above, comprising:

[0020] Step 1: Connect the second base to the second end of the sling, install the jack on the second base, and connect the first base to the first end of the sling;

[0021] Step 2: Lay the assembled sling and the sling load test tooling together flat in the pit;

[0022] Step 3: Preliminarily pressurizing the jack so that the telescopic shaft of the jack abuts against the bearing seat of the first seat body;

[0023] Step 4: Continue to pressurize the jack so that the jack applies static tension between the first end and the second end of the spreader, and observe the condition of the spreader in real time. When the spreader is abnormal, stop pressurizing in time. If the spreader does not have any abnormality during the process of continuing pressurization, continue to pressurize until the static tension reaches 1.25 times the rated load of the spreader;

[0024] Step 5: Relieving the pressure on the jack to remove the static tension applied between the first end and the second end of the spreader;

[0025] Step 6: Visually observe the condition of the sling after completing the load test.

[0026] Further, in order to better implement the present invention, the step of continuing to pressurize the jack in step 4 includes:

[0027] Step 4.1: pressurizing the jack so that the static tension increases from 0 to 0.25 times the rated load of the sling, and then maintaining the pressure on the jack for 15 minutes;

[0028] Step 4.2: pressurizing the jack so that the static tension increases from 0.25 times the rated load of the spreader to 0.5 times the rated load of the spreader, and then maintaining the pressure on the jack for 15 minutes;

[0029] Step 4.3: pressurizing the jack so that the static tension increases from 0.5 times the rated load of the spreader to 0.75 times the rated load of the spreader, and then maintaining the pressure on the jack for 15 minutes;

[0030] Step 4.4: pressurizing the jack so that the static tension increases from 0.75 times the rated load of the spreader to 1 times the rated load of the spreader, and then maintaining the pressure on the jack for 15 minutes;

[0031] Step 4.5: Pressurize the jack so that the static tension increases from 1 times the rated load of the spreader to 1.25 times the rated load of the spreader, and then keep the jack pressurized for 15 minutes.

[0032] Further, in order to better implement the present invention, the step of relieving pressure on the jack in step 5 includes:

[0033] Step 5.1: Unloading the jack to reduce the static tension from 1.25 times the rated load of the spreader to 1 times the rated load of the spreader, maintaining the pressure for 15 minutes and observing the condition of the spreader in time;

[0034] Step 5.2: Unloading the jack to reduce the static tension from 1 times the rated load of the spreader to 0.75 times the rated load of the spreader, maintaining the pressure for 15 minutes and observing the condition of the spreader in time;

[0035] Step 5.3: Relieve the pressure on the jack to reduce the static tension from 0.75 times the rated load of the spreader to 0.5 times the rated load of the spreader, maintain the pressure for 15 minutes and observe the condition of the spreader in time;

[0036] Step 5.4: Unloading the jack to reduce the static tension from 0.5 times the rated load of the spreader to 0.25 times the rated load of the spreader, maintaining the pressure for 15 minutes and observing the condition of the spreader in time;

[0037] Step 5.5: Depressurize the jack to reduce the static tension from 0.25 times the rated load of the spreader to 0, and then observe the condition of the spreader in time.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] (1) The load test tool for a sling provided by the present invention comprises a first seat body, a second seat body and a top support assembly. The sling has a first end for connecting to a lifting device and a second end for connecting to a hoisted object. The first seat body and the second seat body are respectively connected to the first end and the second end. The top support assembly is installed on the second seat body, and the top support assembly is connected to the first seat body, so that static tension is applied between the first seat body and the second seat body by using the top support assembly, and the load test of the sling is performed by using the static tension.

[0040] Through the above structure, the sling load test tool provided by the present invention utilizes the top support assembly to apply static tension between the first end and the second end of the sling, so that tension is generated between the first end and the second end of the sling. Therefore, the above static tension can replace the pulling force applied by the hoisted object on the sling in the traditional load test, thereby performing a load test on the sling. During the experiment, there is no need to hang heavy objects of corresponding weight on the sling, nor is there any need to use lifting equipment, which makes the load test of the ultra-heavy sling easier to implement and can also better measure the load capacity of the sling.

[0041] (2) The sling load test method provided by the present invention uses the above-mentioned sling load test tooling. Therefore, when the sling is subjected to a load test using the method provided by the present invention, it is not necessary to configure weights of corresponding weights and lifting equipment, which makes the implementation simpler. Moreover, the test process is carried out in a pit, and personnel stand on the ground. In this way, even if the sling breaks or encounters abnormal conditions during the test, no harm will be caused to personnel. Therefore, compared with traditional methods, this method also has the advantage of higher safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 It is a structural schematic diagram of a sling load test tool provided by an embodiment of the present invention;

[0044] Figure 2 yes Figure 1 A local enlarged view of area A;

[0045] Figure 3 is a schematic structural diagram of a sling in an embodiment of the present invention;

[0046] Figure 4 is a schematic structural diagram of a first seat body in an embodiment of the present invention;

[0047] Figure 5 is a schematic structural diagram of a second seat body in an embodiment of the present invention (with guide rails installed);

[0048] Figure 6 It is a schematic diagram of the installation structure of the jack on the second seat body in an embodiment of the present invention.

[0049] In the figure:

[0050] 100-first seat body, 110-load-bearing seat, 111-centering block, 120-articulated seat, 200-second seat body, 210-mounting seat, 211-mounting hole, 220-connecting seat, 230-connecting rod, 240-reinforcement rib, 300-jack, 400-sling, 410-columnar member, 420-lifting arm, 430-load-bearing arm, 440-support, 500-guide assembly, 510-guide rail, 520-slider. DETAILED DESCRIPTION

[0051] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0052] Embodiment 1:

[0053] The load test tool provided in this embodiment is as follows: Figure 1-Figure 6 As shown, it includes a first base body 100, a second base body 200 and a top support assembly, wherein:

[0054] The sling 400 has a first end for connecting to a lifting device and a second end for connecting to a hoisted object. The first seat body 100 and the second seat body 200 are respectively connected to the first end and the second end. The top support assembly is installed on the second seat body 200, and the top support assembly is connected to the first seat body 100, so that static tension is applied between the first seat body 100 and the second seat body 200 by using the top support assembly, and the static tension is used to perform a load test on the sling 400.

[0055] Through the above structure, the sling load test tool provided in this embodiment utilizes the top support assembly to apply static tension between the first end and the second end of the sling 400, so that tension is generated between the first end and the second end of the sling 400. Therefore, the above static tension can replace the pulling force applied by the hoisted object on the sling 400 in the traditional load test, thereby performing a load test on the sling 400. During the experiment, there is no need to hang heavy objects of corresponding weight on the sling 400, nor is there any need to use lifting equipment, which makes the ultra-heavy sling load test easier to implement and can also better measure the load capacity of the sling 400.

[0056] Optionally, the above-mentioned sling 400 includes a columnar member 410, two lifting arms 420 and two load-bearing arms 430, wherein the lifting arms 420 and the load-bearing arms 430 are both hinged to the columnar member 410, the lifting arms 420 and the load-bearing arms 430 are respectively located on both sides of the columnar member 410, and the ends of the two load-bearing arms 430 away from the columnar member 410 are both hinged to the support 440, and the support 440 is provided with a lifting hole for connecting with the lifting device The support 440 is connected to the hook of the lifting device 400, so the above-mentioned support 440 constitutes the above-mentioned first end of the lifting device 400, that is, the above-mentioned first seat body 100 is connected to the above-mentioned support 440, and a lifting hole is opened at the position of the above-mentioned lifting arm 420 away from the columnar component 410, and the lifting hole is used to connect the lifting object. Therefore, the lifting holes on the two lifting arms 420 constitute the above-mentioned second end of the lifting device 400, and the above-mentioned second seat body 200 is connected to the lifting holes on the two lifting arms 420.

[0057] The first seat body 100 includes a load-bearing seat 110 and an articulated seat 120, the articulated seat 120 is integrally formed with the load-bearing seat 110 and is located on one side of the load-bearing seat 110, the articulated seat 120 is articulated with the support 440, specifically, the articulated seat 120 is articulated with the lifting hole on the support 440 through an articulated shaft, and the load-bearing seat 110 is movably placed between the two load-bearing arms 430. The end face of the load-bearing seat 110 that is away from the articulated shaft is a load-bearing surface, and the load-bearing surface is a plane.

[0058] The above-mentioned second seat body 200 includes a mounting seat 210, a connecting seat 220 and a connecting rod 230. The two ends of the connecting seat 220 are respectively inserted into the lifting holes on the two lifting arms 420. Specifically, both ends of the connecting seat 220 are provided with insertion rods, and the insertion rods are inserted into the lifting holes. The mounting seat 210 is connected to the connecting seat 220 through the connecting rod 230. The mounting seat 210 is movably placed between the two load-bearing arms 430 and is arranged opposite to the load-bearing seat 110. The top support assembly is installed on the mounting seat 210 and abuts against the load-bearing seat 110. In fact, the top support assembly abuts against the load-bearing surface of the load-bearing seat 110.

[0059] During the test, the supporting assembly is supported between the bearing seat 110 and the mounting seat 210 to apply static tension between the mounting seat 210 and the bearing seat 110. The bearing seat 110 transmits the force to the first end of the sling 400 through the hinge seat 120, and the mounting seat 210 transmits the force to the second end of the sling 400 through the connecting rod 230 and the connecting seat 220, thereby applying the above static tension between the first end and the second end of the sling 400. It should be noted that the above supporting assembly is a retractable mechanism so as to gradually increase the above static tension from zero to 1.25 times the rated load of the sling 400.

[0060] Of course, the above-mentioned sling 400 can also be a structure of other forms, and the above-mentioned first seat body 100 and the second seat body 200 can also be a structure of other forms, as long as the first seat body 100 can be connected to the first end of the sling 400, the second seat body 200 can be connected to the second end of the sling 400, and the supporting assembly can be installed on the second seat body 200 and supported by the first seat body 100.

[0061] Optionally, the two ends of the connecting rod 230 are respectively hinged to the mounting seat 210 and the connecting seat 220, and the number of the connecting rods 230 is two, and the two connecting rods 230 are welded or bolted with a reinforcing rib 240, and the connecting rod 230 and the reinforcing rib 240 form a connecting frame, and the number of the connecting frames is two, and the two connecting frames are oppositely placed on both sides of the columnar member 410, that is, the columnar member 410 is placed at the center between the two connecting frames. Through the above structure, the mounting seat 210 and the connecting seat 220 can be connected to form a stable integral structure. In the above structure, the connecting frame can be more easily disassembled from the mounting seat 210 and the connecting seat 220. Through the above structure, the mounting seat 210 and the connecting seat 220 are located on both sides of the columnar member 410. Of course, the connection between the connecting rod 230 and the mounting seat 210 and the connecting seat 220 is also a snap connection.

[0062] An optional implementation of this embodiment is as follows: the above-mentioned supporting assembly includes a plurality of jacks 300, and the plurality of jacks 300 are all mounted on the mounting seat 210, and the telescopic shafts of the plurality of jacks 300 are all in contact with the bearing seat 110. The jacks 300 can easily control the magnitude of the above-mentioned static tension. Specifically, when the jacks 300 are extended, the static tension increases, and when the jacks 300 are retracted, the static tension decreases. The above-mentioned jacks 300 are hydraulic jacks.

[0063] Optionally, a boss is provided on the outer wall of one side of the mounting seat 210 close to the bearing seat 110, and a plurality of mounting holes 211 are opened on the boss, and the plurality of mounting holes 211 are evenly distributed on the boss, and a jack 300 is installed in each mounting hole 211, and the jack 300 installed in the mounting hole 211 can be more stably connected to the second seat body 200. More preferably, a cover plate (not shown in the figure) can be bolted to the above-mentioned boss, and the cover plate covers the above-mentioned jack 300, and the telescopic shaft of the jack 300 passes through the above-mentioned cover plate, so that the jack 300 can be more stably installed on the second seat body 200. For example, the number of jacks 300 is four, and the number of the above-mentioned mounting holes 211 is also four, and four jacks 300 are respectively installed in four mounting holes 211, and the four jacks 300 are evenly distributed around the center line of the above-mentioned boss. Define the direction between the first end and the second end of the sling 400 as the first direction, the telescopic direction of the above-mentioned jack 300 is the above-mentioned first direction, the above-mentioned boss is a square platform, and the center line is the center line of the boss in the first direction. Two jacks 300 form a group, and the two groups of jacks 300 are symmetrically distributed, and the symmetry error is not greater than 2mm. The position error of the jack 300 relative to the above-mentioned center line is not greater than Φ4mm, and the parallelism error between the free end face of the telescopic shaft of the jack 300 and the bearing surface of the above-mentioned bearing seat 110 is not greater than 0.2mm. In this way, the four jacks 300 can be telescoped along the first direction and can contact the bearing surface at the same time, and can apply force more evenly on the bearing surface.

[0064] The center line passes through the central axis of the lifting hole of the sling 400, and the center line passes through the center of the line connecting the two lifting holes. In this way, it is ensured that the four jacks 300 can apply force evenly between the first end and the second end of the sling 400, ensuring that the first end and the second end of the sling 400 are evenly stressed.

[0065] When in use, when the jack 300 is pressurized, the first seat body 100 tends to move toward a side away from the second seat body 200, so that the above-mentioned static tension is generated between the second seat body 200 and the first seat body 100, and further the above-mentioned static tension is generated between the first end and the second end of the sling 400.

[0066] In order to prevent the first seat body 100 from deflecting when the jack 300 is pressurized. In this embodiment, a guide assembly 500 is installed between the above-mentioned mounting seat 210 and the bearing seat 110, so that the first seat body 100 can only move in the above-mentioned first direction, and the freedom in other directions is limited. Specifically, the above-mentioned guide assembly 500 includes four guide rails 510 extending along the first direction and sliders 520 slidably installed on the guide rails 510. The guide rails 510 are bolted to the mounting seat 210. The four guide rails 510 are evenly distributed around the bearing seat 110. Four centering blocks 111 are provided on the outer wall of the bearing seat 110. Each centering block 111 is provided with a slider 520. The four sliders 520 are slidably connected to the four guide rails 510 respectively.

[0067] Of course, the guide assembly 500 may also include a slide rod and a slide hole. The slide hole is provided on the first seat body 100 and passes through the load-bearing surface. The slide rod is provided on the second seat body 200 and is slidably inserted into the slide hole.

[0068] Embodiment 2:

[0069] This embodiment provides a method for testing a load of a sling, which uses the sling load testing tool as described in Embodiment 1. The method includes:

[0070] Step 1: Connect the second base body 200 to the second end of the sling 400 , install the jack 300 on the second base body 200 , and connect the first base body 100 to the first end of the sling 400 .

[0071] Step 2: Place the assembled sling 400 and the sling load test tooling together in a pit. It should be noted that the pit is pre-dug by the manufacturer.

[0072] Step 3: Preliminarily pressurize the jack 300 so that the telescopic shaft of the jack 300 abuts against the bearing seat 110 of the first seat body 100. In this step, it is necessary to repeatedly check whether the telescopic shaft of the jack 300 abuts against the bearing seat 110 of the first seat body 100.

[0073] Step 4: Continue to pressurize the jack 300 so that the jack 300 applies static tension between the first end and the second end of the sling 400, and observe the condition of the sling 400 in real time. When the sling 400 has an abnormality, stop pressurizing in time. If the sling 400 has no abnormality during the continued pressurization, continue to pressurize until the static tension reaches 1.25 times the rated load of the sling 400. The abnormality of the sling 400 includes cracks, permanent deformation, unusual sounds, etc. on the sling 400. The threaded part is not allowed to have defects such as thread chipping, lodging, broken teeth, cracks, etc. The method of continuing pressurization is as follows:

[0074] Step 4.1: pressurize the jack 300 so that the static tension increases from 0 to 0.25 times of the rated load of the sling 400, and then keep the jack 300 pressurized for 15 minutes;

[0075] Step 4.2: pressurize the jack 300 so that the static tension increases from 0.25 times the rated load of the sling 400 to 0.5 times the rated load of the sling 400, and then keep the jack 300 pressurized for 15 minutes;

[0076] Step 4.3: pressurize the jack 300 so that the static tension increases from 0.5 times the rated load of the sling 400 to 0.75 times the rated load of the sling 400, and then keep the jack 300 pressurized for 15 minutes;

[0077] Step 4.4: pressurize the jack 300 so that the static tension increases from 0.75 times the rated load of the sling 400 to 1 times the rated load of the sling 400, and then keep the jack 300 pressurized for 15 minutes;

[0078] Step 4.5: Pressurize the jack 300 so that the static tension increases from 1 times the rated load of the sling 400 to 1.25 times the rated load of the sling 400, and then keep the jack 300 pressurized for 15 minutes.

[0079] During the pressure maintaining process, it is necessary to observe whether the hanger 400 has any abnormality.

[0080] Step 5: Decompress the jack 300 to remove the static tension applied between the first end and the second end of the sling 400. During the decompression process, it is also necessary to observe whether the sling 400 is abnormal. The specific method of decompression is as follows:

[0081] Step 5.1: Unload the jack 300 to reduce the static tension from 1.25 times the rated load of the sling 400 to 1 times the rated load of the sling 400, maintain the pressure for 15 minutes and observe the condition of the sling 400 in time;

[0082] Step 5.2: Unload the jack 300 to reduce the static tension from 1 times the rated load of the sling 400 to 0.75 times the rated load of the sling 400. Maintain the pressure for 15 minutes and observe the condition of the sling 400 in time.

[0083] Step 5.3: Unload the jack 300 to reduce the static tension from 0.75 times the rated load of the sling 400 to 0.5 times the rated load of the sling 400, maintain the pressure for 15 minutes and observe the condition of the sling 400 in time;

[0084] Step 5.4: Unload the jack 300 to reduce the static tension from 0.5 times the rated load of the sling 400 to 0.25 times the rated load of the sling 400. Maintain the pressure for 15 minutes and observe the condition of the sling 400 in time.

[0085] Step 5.5: Unload the jack 300 to reduce the static tension from 0.25 times the rated load of the sling 400 to 0, and then observe the condition of the sling 400 in time.

[0086] Step 6: Visually observe the condition of the sling 400 after the load test. Of course, it is also necessary to perform ultrasonic testing on the connecting pins of the sling 400 that has completed the load test, and perform flaw detection again on all accessible welds according to the requirements in the drawings.

[0087] When the above method is used to perform a load test on the sling 400, the jack 300 is used to form static tension at the first end and the second end of the sling 400, thereby replacing the pulling force applied by the heavy object on the sling 400. Therefore, when the method provided in this embodiment is used to perform a load test on the sling 400, it is not necessary to configure heavy objects of corresponding weights and lifting equipment, which is simpler to implement. Moreover, the test process is carried out in a pit, and personnel stand on the ground. In this way, even if the sling 400 breaks or other abnormal conditions occur during the test, it will not cause harm to personnel. Therefore, compared with traditional methods, this method also has the advantage of higher safety.

[0088] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A sling load test tool, the sling (400) having a first end for connecting to a lifting device and a second end for connecting to a lifting object, characterized in that: include: A first seat body (100), connected to the first end; A second seat (200), connected to the second end; A top support assembly is installed on the second seat body (200), and the top support assembly is connected to the first seat body (100) so as to utilize the top support assembly to apply static tension between the first seat body (100) and the second seat body (200) to perform a load test on the hanger (400).

2. The hanger load test tool according to claim 1, characterized in that: The lifting device (400) comprises a columnar component (410), two lifting arms (420) and two load-bearing arms (430), wherein the lifting arms (420) and the load-bearing arms (430) are both hinged to the columnar component (410), and the lifting arms (420) and the load-bearing arms (430) are respectively located on both sides of the columnar component (410), and one end of the two load-bearing arms (430) away from the columnar component (410) is hinged to a support (440), and the support (440) constitutes the first end, and a lifting hole is provided at a position of the lifting arm (420) away from the columnar component (410), and the lifting holes of the two lifting arms (420) constitute the second end; The first seat body (100) comprises a load-bearing seat (110) and an articulated seat (120), wherein the articulated seat (120) is arranged on one side of the load-bearing seat (110), the articulated seat (120) is hinged to the support (440), and the load-bearing seat (110) is movably placed between the two load-bearing arms (430); The second seat body (200) includes a mounting seat (210), a connecting seat (220) and a connecting rod (230), the two ends of the connecting seat (220) are respectively inserted into the lifting holes on the two lifting arms (420), the mounting seat (210) is connected to the connecting seat (220) through the connecting rod (230), the mounting seat (210) is movably placed between the two load-bearing arms (430) and is arranged opposite to the load-bearing seat (110), and the top support assembly is installed on the mounting seat (210) and abuts against the load-bearing seat (110).

3. The hanger load test tool according to claim 2, characterized in that: The two ends of the connecting rod (230) are respectively hinged to the mounting seat (210) and the connecting seat (220), there are two connecting rods (230), a reinforcing rib (240) is fixed between the two connecting rods (230), the connecting rod (230) and the reinforcing rib (240) form a connecting frame, there are two connecting frames, and the two connecting frames are symmetrically arranged on both sides of the columnar component (410).

4. The hanger load test tool according to claim 2, characterized in that: The top support assembly comprises: A plurality of jacks (300) are provided, and the plurality of jacks (300) are all mounted on the mounting seat (210), and the telescopic shafts of the plurality of jacks (300) are all in contact with the bearing seat (110).

5. The hanger load test tool according to claim 4, characterized in that: A boss is provided on the outer wall of one side of the mounting seat (210) close to the bearing seat (110), and a plurality of mounting holes (211) are opened on the boss. The plurality of mounting holes (211) are evenly distributed on the boss, and a jack (300) is installed in each mounting hole (211).

6. The hanger load test tool according to claim 4 or 5, characterized in that: A guide assembly (500) is also installed between the mounting seat (210) and the force bearing seat (110).

7. The hanger load test tool and test method according to claim 6, characterized in that: The direction between the first end and the second end is a first direction, and the extension and retraction direction of the jack (300) is the first direction; The guide assembly (500) comprises four guide rails (510) extending along the first direction and sliders (520) slidably mounted on the guide rails (510); the guide rails (510) are bolted to the mounting seat (210) by bolts; the four guide rails (510) are evenly distributed around the force-bearing seat (110); four centering blocks (111) are arranged on the outer wall of the force-bearing seat (110); each centering block (111) is provided with a slider (520); and the four sliders (520) are slidably connected to the four guide rails (510) respectively.

8. A method for testing load of a sling, characterized in that: The spreader load test tool as claimed in any one of claims 4 to 7 comprises: Step 1: Connect the second base (200) to the second end of the sling (400), install the jack on the second base (200), and connect the first base (100) to the first end of the sling (400); Step 2: placing the assembled sling (400) and the sling load test tool together flat in the pit; Step 3: Preliminary pressurization is applied to the jack so that the telescopic shaft of the jack (300) abuts against the bearing seat (110) of the first seat body (100); Step 4: continue to pressurize the jack (300) so that the jack (300) applies static tension between the first end and the second end of the sling (400), and observe the condition of the sling (400) in real time. When the sling (400) is abnormal, stop pressurizing in time. If the sling (400) does not have any abnormality during the process of continuing pressurization, continue to pressurize until the static tension reaches 1.25 times the rated load of the sling (400); Step 5: Relieving the pressure on the jack (300) to remove the static tension applied between the first end and the second end of the sling (400); Step 6: Visually observe the condition of the sling (400) after the load test is completed.

9. The method for testing the load of a sling according to claim 8, characterized in that: The step of continuing to pressurize the jack (300) in step 4 includes: Step 4.1: pressurizing the jack (300) so that the static tension increases from 0 to 0.25 times the rated load of the sling (400), and then maintaining the pressure of the jack (300) for 15 minutes; Step 4.2: Pressurizing the jack (300) so that the static tension increases from 0.25 times the rated load of the sling (400) to 0.5 times the rated load of the sling (400), and then maintaining the pressure of the jack (300) for 15 minutes; Step 4.3: pressurizing the jack (300) so that the static tension increases from 0.5 times the rated load of the sling (400) to 0.75 times the rated load of the sling (400), and then maintaining the pressure of the jack (300) for 15 minutes; Step 4.4: pressurizing the jack (300) so that the static tension increases from 0.75 times the rated load of the sling (400) to 1 times the rated load of the sling (400), and then maintaining the pressure of the jack (300) for 15 minutes; Step 4.5: Pressurize the jack (300) so that the static tension increases from 1 times the rated load of the sling (400) to 1.25 times the rated load of the sling (400), and then keep the jack (300) under pressure for 15 minutes.

10. The method for testing the load of a sling according to claim 9, characterized in that: The step of relieving the pressure on the jack (300) in step 5 includes: Step 5.1: Relieve the pressure on the jack (300) to reduce the static tension from 1.25 times the rated load of the sling (400) to 1 times the rated load of the sling (400), maintain the pressure for 15 minutes and observe the condition of the sling (400) in time; Step 5.2: Relieve the pressure on the jack (300) so that the static tension is reduced from 1 times the rated load of the sling (400) to 0.75 times the rated load of the sling (400), maintain the pressure for 15 minutes and observe the condition of the sling (400) in time; Step 5.3: Relieve the pressure on the jack (300) to reduce the static tension from 0.75 times the rated load of the sling (400) to 0.5 times the rated load of the sling (400), maintain the pressure for 15 minutes and observe the condition of the sling (400) in time; Step 5.4: Relieve the pressure on the jack (300) to reduce the static tension from 0.5 times the rated load of the sling (400) to 0.25 times the rated load of the sling (400), maintain the pressure for 15 minutes and observe the condition of the sling (400) in time; Step 5.5: Relieve the pressure on the jack (300) to reduce the static tension from 0.25 times the rated load of the sling (400) to 0, and then observe the condition of the sling (400) in time.

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