Marine lifting lug tension test device and use method thereof

Abstract

The invention discloses a marine lifting lug tension test device and a use method thereof.A to-be-tested lifting lug is covered with a cover cylinder, a jacking element and a pressure meter are arranged in the cover cylinder and supported through a stress base plate in the cover cylinder, and then the to-be-tested lifting lug is connected with a cover plate on the cover cylinder through a test connecting assembly; therefore, when the movable end of the jacking element abuts against the cover plate, the force borne by the cover plate is transmitted to the to-be-tested lifting lug through the test connecting assembly, an upward pulling force is applied to the to-be-tested lifting lug, meanwhile, the cover cylinder bears a counter-acting force in the opposite direction, pulling force testing can be carried out on the lifting lugs at various installation angles, and the testing accuracy is improved. And the tension test of the lifting lug is not influenced by the tension direction.

Description

Technical Field

[0001] The invention relates to the technical field of shipbuilding, and in particular to a ship lifting eye tension test device and a use method thereof. Background Art

[0002] Large ships are usually equipped with many lifting lugs for equipment maintenance. Classification societies stipulate that lifting lugs with a rated load of more than 1 ton must undergo tension tests to ensure the reliability of the lifting lugs. Currently, the lifting lug tension is tested by hanging a weight under the lifting lug. This method has the following disadvantages:

[0003] First, it is necessary to equip various specifications of weights to adapt to various specifications of lifting lugs. For example, a 25-ton lifting lug requires 30 tons of weights, which consumes a lot of manpower and material resources to prepare the weights;

[0004] Second, the iron weights need to be moved back and forth by forklift, which takes a long time to prepare;

[0005] Third, for the lifting lugs arranged in a narrow space, there is not enough space to place the weight, and it is difficult to use the pulling force of the lifting lugs;

[0006] Fourth, for some lifting ears arranged vertically upward, obliquely or sideways, it is impossible to directly mount weights on the lifting ears to perform lifting ear tension tests, and the lifting ear tension tests are difficult to operate. Summary of the invention

[0007] In view of this, the present invention provides a marine lifting eye tension test device and a use method thereof, so as to solve the problems existing in the above-mentioned background technology.

[0008] A marine lifting eye tension test device comprises a cover tube covering the lifting eye to be tested, a cover plate covering the end of the cover tube, and a lifting element and a pressure gauge arranged inside the cover tube, wherein a force-bearing seat plate for supporting the lifting element and transmitting the test load applied by the lifting element to the cover tube is laterally arranged inside the cover tube, the pressure gauge is arranged between the lifting element and the force-bearing seat plate, the movable end of the lifting element presses against the cover plate to apply a force opposite to the test load applied to the cover plate, and a test connection assembly passing through the force-bearing seat plate and connected to the lifting eye to be tested is fixed on the cover plate.

[0009] Preferably, the test connection assembly includes a connecting buckle fixed on the lifting ear to be tested, and a test connecting rod connected to the connecting buckle. The test connecting rod vertically passes through the force-bearing seat plate and the cover plate, and a pull rod nut is fixed on the rod body extending out of the cover plate. The pull rod nut is screwed until it contacts the outer end surface of the cover plate.

[0010] Preferably, the test connecting rod is a U-shaped rod, the test connecting rod is buckled with the connecting buckle, and through holes for the test connecting rod to pass through are provided at the same positions on the cover plate and the force bearing seat plate.

[0011] Preferably, the inner end surface of the cover plate is also provided with a limiting structure for preventing the cover plate from lateral displacement after being subjected to force during the tensile test, and the limiting structure is in contact with the inner wall of the cylinder of the cover cylinder.

[0012] Preferably, the limiting structure is composed of a plurality of limiting rods evenly distributed in the circumferential direction.

[0013] Preferably, the lifting element is connected to the driving element through a pipeline, the pressure gauge is connected to the pressure display through a signal line, and a connecting pipeline channel for the pipeline and the signal line to pass through is opened on the cylinder body of the cover cylinder.

[0014] Preferably, the lifting element is a hydraulic cylinder, and the driving element is an oil pump.

[0015] Preferably, the force-bearing seat plate is fixed to the welding cover cylinder by welding, or the force-bearing seat plate and the welding cover cylinder are integrally formed.

[0016] A method for using a marine lifting lug tension test device specifically comprises the following steps:

[0017] S1, buckle the connecting shackle on the lifting lug to be tested, and connect the test connecting rod to the connecting shackle;

[0018] S2, the cover tube covers the lifting lug to be tested and one end of the cover tube contacts the hull structure around the lifting lug to be tested, and at the same time, the end of the test connecting rod passes through the through hole on the force bearing seat plate;

[0019] S3, place the pressure gauge on the stress-bearing seat plate, place the lifting element on the pressure gauge, connect the lifting element to the driving element through a pipeline, and connect the pressure gauge to the pressure display through a signal line;

[0020] S4, cover the other end of the cover tube with a cover plate, and let the end of the test connecting rod pass through the through hole on the cover plate, and then install the tie rod nut on the test connecting rod and tighten it;

[0021] S5, start the driving element, the active end of the driving element presses against the cover plate in the direction away from the lifting lug to be tested, the cover plate applies the same direction test tension to the lifting lug to be tested through the test connecting rod and the connecting buckle, and the test load in the opposite direction is transmitted to the cover cylinder through the load-bearing seat plate, the cover cylinder is pressed against the hull structure, and the pressure displayed by the pressure display instrument is used to determine whether the test tension reaches the required value of the lifting lug tension test. If it reaches the required value, the tension is maintained for a certain period of time, then the entire device is removed to observe the condition of the lifting lug to be tested.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention provides a cover tube on the outer cover of the lifting ear to be tested, arranges a lifting element and a pressure gauge inside the cover tube, and uses a force-bearing seat plate in the cover tube to support the lifting element and the pressure gauge, and then connects the lifting ear to be tested with the cover plate on the cover tube through a test connection assembly. In this way, when the movable end of the lifting element presses against the cover plate, the force exerted on the cover plate is transmitted to the lifting ear to be tested through the test connection assembly, thereby applying an upward pulling force to the lifting ear to be tested, and at the same time, the cover tube is subjected to a reaction force in the opposite direction. Tension tests can be performed on lifting ears at various installation angles, which effectively solves the problem that tension tests on lifting ears at certain angles are difficult to operate, and the lifting ear tension test is not affected by the tension direction.

[0024] 2. The lifting eye tension test device of the present invention is small in size, can be flexibly operated in a narrow space of a ship, has a simple structure, and each component is easy to obtain or process. It is convenient to assemble and carry, and can be reused in various occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments 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.

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 It is a schematic diagram of the structure of the hood.

[0028] The meanings of the numbers in the figure are:

[0029] 1 is a cover tube, 2 is a connecting buckle, 3 is a test connecting rod, 4 is a cover plate, 5 is a force-bearing seat plate, 6 is a limiting structure, 7 is a tie rod nut, 8 is a lifting element, 9 is a driving element, 10 is a pressure gauge, 11 is a pressure display instrument, and 12 is a lifting eye to be tested. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0031] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0032] In order to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings.

[0033] The present invention provides a marine lifting eye tension test device, which comprises a cover tube 1, a cover plate 4, a force bearing seat plate 5, a lifting element 8, a pressure gauge 10 and a test connection assembly.

[0034] The cover tube 1 covers the lifting lug 12 to be tested and one end of the cover tube 1 contacts the hull structure around the lifting lug 12 to be tested, and the cover plate 4 covers the other end of the cover tube 1. In this embodiment, the cover tube 1 is a cylindrical cover tube, and of course it can be designed into other shapes. The cover plate 4 is correspondingly designed as a circular cover plate. A U-shaped notch is provided at the lower part of the wall of the cover tube for convenient observation of the lifting lug tensile test state, and a slot is provided at the upper part of the wall for convenient passage of the pipeline and signal line of the jacking element and the press.

[0035] The force bearing seat plate 5 is transversely arranged inside the cover cylinder 1 , and the force bearing seat plate 5 is used to support the lifting element 8 and the pressure gauge 10 , and transmit the test load applied by the lifting element 8 to the cover cylinder 1 .

[0036] Preferably, the stress-bearing seat plate 5 can be welded and fixed to the welding hood 1, or can be integrally formed with the welding hood 1. In this embodiment, the stress-bearing seat plate 5 is welded and fixed to the welding hood 1 as a whole.

[0037] The lifting element 8 and the pressure gauge 10 are arranged inside the cover cylinder 1, and the pressure gauge 10 is arranged between the lifting element 8 and the force-bearing seat plate 5, that is, the pressure gauge 10 is placed on the force-bearing seat plate 5, and the lifting element 8 is placed on the pressure gauge 10. The movable end of the lifting element 8 presses against the cover plate 4 to apply a force opposite to the test load on the cover cylinder 1 to the cover plate 4, that is, the force on the cover cylinder 1 is downward, and the force on the cover plate 4 is upward.

[0038] A test connection assembly is fixed on the cover plate 4, which passes through the force-bearing seat plate 5 and is connected to the lifting ear 12 to be tested. In this way, when the cover plate 4 is subjected to an upward force, the force can be transmitted to the lifting ear 12 to be tested through the test connection assembly, thereby applying an upward pulling force to the lifting ear 12 to be tested.

[0039] The test connection assembly includes a connecting buckle 2 fixed on the lifting ear 12 to be tested, and a test connecting rod 3 connected to the connecting buckle 2. The test connecting rod 3 vertically passes through the force-bearing seat plate 5 and the cover plate 4, and a pull rod nut 7 is fixed on the rod body extending out of the cover plate 4. The pull rod nut 7 is screwed until it contacts the outer end surface of the cover plate 4.

[0040] In this embodiment, the test connecting rod 3 is a U-shaped rod, which is buckled with the connecting buckle 2. A through hole for the test connecting rod 3 to pass through is opened at the same position on the cover plate 4 and the force-bearing seat plate 5. The aperture of the through hole is slightly larger than the diameter of the test connecting rod 3, that is, two through holes slightly larger than the diameter of the U-shaped rod are drilled on the cover plate 4, and two through holes of the same size are also opened at the same position of the force-bearing seat plate 5, and the cover plate 4 and the test connecting rod are fixed by a tie rod nut 7.

[0041] The test connecting rod 3 needs to be made of high-strength steel, and the strength grade of the tie rod nut 7 should be 8.0 or above to ensure that it can withstand the corresponding load.

[0042] The two straight rod sections of the test connecting rod 3 are provided with threads, and the length of the threads can be appropriately lengthened to be suitable for the testing of lifting lugs of different models and specifications.

[0043] The specifications of the connecting shackle 2 can be selected according to the specifications of the lifting eye 12 to be tested.

[0044] Preferably, the inner end surface of the cover plate 4 is also provided with a limiting structure 6 for preventing the cover plate 4 from lateral displacement after being subjected to force during the tensile test, and the limiting structure 6 is in contact with the inner wall of the cylinder of the cover cylinder 1. In this embodiment, the limiting structure 6 is composed of a plurality of limiting rods evenly distributed in the circumferential direction. Preferably, the limiting rods can be set to 4. By vertically fixing the 4 limiting rods on the inner end surface of the cover plate 4, the cover plate 4 can be prevented from lateral displacement after being subjected to force, so as to ensure the safety of the entire device.

[0045] The lifting element 8 is connected to the driving element 9 through a pipeline, the pressure gauge 10 is connected to the pressure display 11 through a signal line, and a connecting pipeline channel for the pipeline and the signal line to pass through is opened on the cylinder body of the cover cylinder 1.

[0046] In this embodiment, the lifting element 8 is a hydraulic cylinder, and the driving element 9 is an oil pump. The oil pump can be a hand pump or an electric oil pump.

[0047] The pressure gauge 10 can accurately measure the pressure generated by the hydraulic cylinder 8 and display the pressure on the pressure display 11, thereby meeting the load of the measured lifting eye.

[0048] In this embodiment, except for the test connecting rod 3 and the pull rod bolt 7 mentioned above which are selected according to regulations, the connecting buckle 2 is selected according to standards, the pressure gauge 10 and the pressure display 11, the hydraulic cylinder 8 and the oil pump 9 are selected according to factory standards, all other components are made of Q235-A or equivalent materials.

[0049] The invention saves space by combining multiple components, and meets the requirements of various narrow spaces, side or reverse top lifting lug tension tests on ships. The device has a simple structure, easy processing of parts, convenient assembly, and can be used in various occasions.

[0050] The present invention also provides a method for using a marine lifting eye tension test device, which specifically comprises the following steps:

[0051] S1, buckle the connecting shackle 2 on the lifting lug 12 to be tested, and connect the test connecting rod 3 to the connecting shackle 2;

[0052] S2, the cover tube 1 covers the lifting lug 12 to be tested and one end of the cover tube is in contact with the hull structure around the lifting lug 12 to be tested, and at the same time, the end of the test connecting rod 3 passes through the through hole on the force bearing seat plate 5;

[0053] S3, placing the pressure gauge 10 on the force bearing seat plate 5, placing the lifting element 8 on the pressure gauge 10, connecting the lifting element 8 with the driving element 9 through a pipeline, and connecting the pressure gauge 10 with the pressure display 11 through a signal line;

[0054] S4, cover the cover plate 4 on the other end of the cover tube 1, and make the end of the test connecting rod 3 pass through the through hole on the cover plate 4, and then install the tie rod nut 7 on the test connecting rod 3 and tighten it;

[0055] S5, start the driving element 9, the movable end of the driving element 9 presses against the cover plate 4 in the direction away from the lifting ear to be tested, the cover plate 4 applies the same-direction test tension to the lifting ear 12 to be tested through the test connecting rod 3 and the connecting buckle 2, and the test load in the opposite direction is transmitted to the cover tube 1 through the load-bearing seat plate 5, the cover tube 1 is pressed tightly against the hull structure, and the pressure displayed by the pressure display instrument 11 is used to determine whether the test tension reaches the required value of the lifting ear tension test. If the tension is maintained for a certain period of time, the entire device is removed to observe the condition of the lifting ear 12 to be tested.

[0056] It should be clear that 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 embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A marine lifting eye tension test device, characterized in that: The invention comprises a cover tube (1) covering a lifting ear (12) to be tested, a cover plate (4) covering the end of the cover tube (1), and a lifting element (8) and a pressure gauge (10) arranged inside the cover tube (1); a force bearing seat plate (5) for supporting the lifting element (8) and transmitting the test load applied by the lifting element (8) to the cover tube (1) is arranged laterally inside the cover tube (1); the pressure gauge (10) is arranged between the lifting element (8) and the force bearing seat plate (5); the movable end of the lifting element (8) presses against the cover plate (4) to apply a force opposite to the test load applied to the cover tube (1); and a test connection assembly passing through the force bearing seat plate (5) and connected to the lifting ear (12) to be tested is fixed on the cover plate (4).

2. The marine lifting eye tension test device according to claim 1, characterized in that: The test connection assembly comprises a connection shackle (2) fixed on the lifting ear (12) to be tested, and a test connection rod (3) connected to the connection shackle (2); the test connection rod (3) vertically passes through the force-bearing seat plate (5) and the cover plate (4), and a tie rod nut (7) is fixed on the rod body extending out of the cover plate (4); the tie rod nut (7) is screwed until it contacts the outer end surface of the cover plate (4).

3. The marine lifting eye tension test device according to claim 2, characterized in that: The test connecting rod (3) is a U-shaped rod, the test connecting rod (3) is buckled with the connecting buckle (2), and through holes for the test connecting rod (3) to pass through are provided at the same positions on the cover plate (4) and the force bearing seat plate (5).

4. The marine lifting eye tension test device according to claim 1, characterized in that: The inner end surface of the cover plate (4) is also provided with a limiting structure (6) for preventing the cover plate (4) from lateral displacement after being subjected to force during a tensile test, and the limiting structure (6) is in contact with the inner wall of the cylinder of the cover cylinder (1).

5. The marine lifting eye tension test device according to claim 4, characterized in that: The limiting structure (6) is composed of a plurality of limiting rods evenly distributed in the circumferential direction.

6. The marine lifting eye tension test device according to claim 1, characterized in that: The lifting element (8) is connected to the driving element (9) via a pipeline, the pressure gauge (10) is connected to the pressure display (11) via a signal line, and a connecting pipeline channel for the pipeline and the signal line to pass through is provided on the cylinder body of the cover cylinder (1).

7. The marine lifting eye tension test device according to claim 6, characterized in that: The lifting element (8) is a hydraulic cylinder, and the driving element (9) is an oil pump.

8. The marine lifting eye tension test device according to claim 1, characterized in that: The stress-bearing seat plate (5) and the welding cover tube (1) are fixed by welding, or the stress-bearing seat plate (5) and the welding cover tube (1) are integrally formed.

9. A method for using a marine lifting eye tension test device, characterized in that: The specific steps include: S1, buckle the connecting shackle (2) onto the lifting lug (12) to be tested, and connect the test connecting rod (3) to the connecting shackle (2); S2, the cover tube (1) covers the lifting lug (12) to be tested and one end of the cover tube (1) contacts the hull structure around the lifting lug (12) to be tested, and at the same time, the end of the test connecting rod (3) passes through the through hole on the force bearing seat plate (5); S3, placing the pressure gauge (10) on the force bearing seat plate (5), placing the lifting element (8) on the pressure gauge (10), connecting the lifting element (8) to the driving element (9) through a pipeline, and connecting the pressure gauge (10) to the pressure display (11) through a signal line; S4, cover the other end of the cover tube (1) with the cover plate (4), and allow the end of the test connecting rod (3) to pass through the through hole on the cover plate (4), and then install the tie rod nut (7) on the test connecting rod (3) and tighten it; S5, start the driving element (9), the movable end of the driving element (9) presses against the cover plate (4) in the direction away from the lifting lug to be tested, the cover plate (4) applies a test tension in the same direction to the lifting lug to be tested (12) through the test connecting rod (3) and the connecting shackle (2), and the test load in the opposite direction is simultaneously transmitted to the cover tube (1) through the load-bearing seat plate (5), the cover tube (1) is pressed against the hull structure, and the pressure displayed by the pressure display instrument (11) is used to determine whether the test tension reaches the required value of the lifting lug tension test. If the tension reaches the required value, the entire device is removed after maintaining the tension for a certain period of time, and the condition of the lifting lug to be tested (12) is observed.

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