Ribbed pipeline ring stiffness testing machine

Abstract

The utility model discloses a stiffened pipeline ring stiffness testing machine which comprises a ring stiffness testing machine body, a movable plate is assembled on the inner wall of the ring stiffness testing machine body, a test piece is assembled between two loading structures, a ring stiffness test is conducted through the ring stiffness testing machine body, the displacement of the pressure applying and loading structures is adjusted through the movable plate, and through the action of the loading structures, the ring stiffness of the stiffened pipeline is tested. The horizontal distance between the main loading plate and the auxiliary loading plate can be adjusted through the connecting blocks, the sliding rods and the springs so that the distance can be consistent with the width of the reinforcing ribs, after the main loading plate and the auxiliary loading plate are adjusted according to the actual size of the glass fiber reinforced plastic reinforced pipe, a glass fiber reinforced plastic reinforced pipe test piece is placed in, and the test piece comprises a pipe body and the reinforcing ribs. When the glass fiber reinforced plastic ribbed pipe rotates, the main loading plate is just in contact with the reinforcing ribs, the auxiliary loading plate is just in contact with the pipe body, then the movable plate is moved to apply a compression load to the loading structure at the upper end, and the reinforcing ribs and the pipe body are synchronously stressed and deformed, so that the overall ring stiffness of the glass fiber reinforced plastic ribbed pipe is obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline ring stiffness testing, and particularly relates to a ring stiffness testing machine for reinforced pipelines. Background Technique

[0002] The ring stiffness of a pipeline refers to the load magnitude that a pipe ring per unit length can withstand under external pressure at a certain radial deformation, which characterizes the ability of the pipe ring to resist external loads and is one of the most important performance indicators of the pipeline. To obtain the ring stiffness of a pipeline, generally, the parallel plate test method is adopted. By placing the pipe ring on a test device with two parallel plates and applying a compressive load, the pipeline deforms, and the ring stiffness of the pipeline can be obtained through the relationship between the deformation and the load.

[0003] Generally, the outer surface of a pipeline is smooth and flat, and the above method can be directly used for the ring stiffness test. However, for fiberglass pipelines, in order to improve the ring stiffness of the pipeline, reinforcing ribs can be made at certain intervals on the outer surface of the pipeline to form a fiberglass reinforced pipe. If the parallel plate external load test device is also used for fiberglass reinforced pipelines, the flat plate will first contact the reinforcing ribs, and the external load will only act on the reinforcing ribs. The reinforcing ribs will deform first, resulting in inconsistent deformation and making it impossible to calculate the ring stiffness according to the definition of the ring stiffness. Content of the Utility Model

[0004] The purpose of the utility model is to provide a ring stiffness testing machine for reinforced pipelines to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A ring stiffness testing machine for reinforced pipelines, including a ring stiffness testing machine. A movable plate is assembled on the inner wall of the ring stiffness testing machine, and the movable plate can displace along with the power component inside the ring stiffness testing machine. A loading structure is fixedly assembled at the lower end of the movable plate, and a loading structure is fixedly assembled on the inner wall surface of the ring stiffness testing machine. A test piece is assembled between the two loading structures.

[0006] Preferably, the loading structure includes a main loading plate, which is fixedly assembled on the inner wall surface of the ring stiffness testing machine or at the lower end of the movable plate. Two secondary loading plates are connected to the surface of the main loading plate through two connecting blocks. A support block is fixedly assembled on one side of each of the two secondary loading plates. A sliding rod is fixedly assembled on the side wall of each of the two support blocks. The two sliding rods penetrate through the inner walls of the corresponding connecting blocks, and springs are sleeved on the outer walls of the two sliding rods. The springs are arranged between the connecting blocks and the support blocks.

[0007] Preferably, a hand grip is provided on one side of the surface of the secondary loading plate.

[0008] Preferably, the test piece is composed of a fiberglass reinforced pipeline and reinforcing ribs.

[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows: Through a ring stiffness testing machine, a ring stiffness test is carried out. By adjusting the displacement of the pressure application loading structure through a movable plate, through the action of the loading structure, the horizontal distance between the main loading plate and the secondary loading plate can be adjusted through a connecting block, a sliding rod and a spring, so that the distance is consistent with the width of the reinforcing rib. When the main loading plate and the secondary loading plate are adjusted according to the actual size of the fiberglass reinforced pipe, and then the fiberglass reinforced pipe specimen is placed in. The specimen includes a pipe body and a reinforcing rib. Then the main loading plate just contacts the reinforcing rib, and the secondary loading plate just contacts the pipe body. After that, move the movable plate to apply a compressive load to the upper loading structure, then the reinforcing rib and the pipe body will be stressed and deformed synchronously, so as to obtain the overall ring stiffness of the fiberglass reinforced pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic structural diagram of the present utility model;

[0011] Figure 2 is a front view of the present utility model;

[0012] Figure 3 is Figure 2 an enlarged schematic diagram of the structure at A in

[0013] In the figure: 1-ring stiffness testing machine, 2-movable plate, 3-hand buckle, 4-specimen, 5-loading structure, 51-main loading plate, 52-connecting block, 53-secondary loading plate, 54-sliding rod, 55-spring, 56-support block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0015] Please refer to Figures 1-3 , the present utility model provides a ring stiffness testing machine for reinforced pipes, including a ring stiffness testing machine 1. The inner wall of the ring stiffness testing machine 1 is equipped with a movable plate 2. The movable plate 2 can displace along with the power component inside the ring stiffness testing machine 1. The lower end of the movable plate 2 is fixedly equipped with a loading structure 5. The surface of the inner wall of the ring stiffness testing machine 1 is fixedly equipped with a loading structure 5. A specimen 4 is assembled between the two loading structures 5.

[0016] The ring stiffness test is carried out by a ring stiffness testing machine 1. The displacement of the pressure application loading structure 5 is adjusted by a trapdoor 2. Through the action of the loading structure 5, the horizontal distance between the main loading plate 51 and the auxiliary loading plate 53 can be adjusted by a connecting block 52, a slide bar 54 and a spring 55, so that the distance is the same as the width of the stiffeners of the specimen 4. After adjusting the main loading plate 51 and the auxiliary loading plate 53 according to the actual size of the FRP reinforced pipe, the FRP reinforced pipe specimen 4 is placed in. The specimen 4 includes a pipe body and stiffeners. Then the main loading plate 51 just contacts the stiffeners, and the auxiliary loading plate 53 just contacts the pipe body. After that, the trapdoor 2 is moved to apply a compressive load to the upper loading structure 5, and the stiffeners and the pipe body will be stressed and deformed synchronously, so as to obtain the overall ring stiffness of the FRP reinforced pipe.

[0017] The loading structure 5 includes a main loading plate 51 which is fixedly assembled on the inner wall surface of the ring stiffness testing machine 1 or the lower end of the trapdoor 2. Two auxiliary loading plates 53 are connected to the surface of the main loading plate 51 through two connecting blocks 52. A support block 56 is fixedly assembled on one side of each of the two auxiliary loading plates 53. A slide bar 54 is fixedly assembled on the side wall of each of the two support blocks 56. The two slide bars 54 are all penetrated and assembled in the inner wall of the corresponding connecting block 52. A spring 55 is sleeved on the outer wall of each of the two slide bars 54. The spring 55 is arranged between the connecting block 52 and the support block 56.

[0018] When it is necessary to adjust the two auxiliary loading plates 53 according to the stiffeners, first move the auxiliary loading plate 53, pull it towards the outer end, and drive the slide bar 54 to displace through the support block 56. The slide bar 54 squeezes the spring 55 to deform and store energy. At this time, the stiffeners of the specimen are placed between the two auxiliary loading plates 53, and the two auxiliary loading plates are released. At this time, according to the elastic force of the spring 55, the support block 56 is squeezed to move towards the original position direction, and the two ends of the auxiliary loading plates 53 are driven to fit on both sides of the stiffeners, completing the adjustment.

[0019] A handhold 3 is arranged on one side of the surface of the auxiliary loading plate 53.

[0020] The handhold 3 facilitates the movement of the auxiliary loading plate 53.

[0021] The specimen 4 is composed of an FRP reinforced pipe and stiffeners.

[0022] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reinforced pipe ring stiffness testing machine, characterized in that: The ring stiffness testing machine (1) comprises a movable plate (2) mounted on the inner wall of the ring stiffness testing machine (1), the movable plate (2) being displaceable along with a power component inside the ring stiffness testing machine (1), a loading structure (5) being fixedly mounted on the lower end of the movable plate (2), a loading structure (5) being fixedly mounted on the inner wall surface of the ring stiffness testing machine (1), and a test piece (4) being mounted between two loading structures (5); The loading structure (5) comprises a main loading plate (51), the main loading plate (51) is fixedly mounted on the inner wall surface of the ring stiffness testing machine (1) or the lower end of the movable plate (2), the surface of the main loading plate (51) is connected to two auxiliary loading plates (53) through two connecting blocks (52), one side of the two auxiliary loading plates (53) is fixedly mounted with a supporting block (56), the side walls of the two supporting blocks (56) are fixedly mounted with a sliding rod (54), the two sliding rods (54) are penetrated and mounted on the inner wall of the corresponding connecting block (52), the outer walls of the two sliding rods (54) are sleeved with a spring (55), and the spring (55) is arranged between the connecting block (52) and the supporting block (56).

2. A reinforced pipe ring stiffness testing machine according to claim 1, characterized in that: A hand buckle (3) is provided on one side of the surface of the auxiliary loading plate (53).

3. A reinforced pipe ring stiffness testing machine according to claim 1, characterized in that: The test piece (4) is composed of a glass fiber reinforced plastic pipe and reinforcing ribs.

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