Supporting point supporting and adjusting device of pipe resonance bending fatigue testing machine

Abstract

The utility model relates to a fulcrum supporting and adjusting device of a pipe resonance bending fatigue testing machine, which comprises a base, four base adjusting tires, two adjustable supporting frames, two supporting tires, a sample supporting ring and a binding band, the four base adjusting tires are respectively arranged at four corners of the base through base tire shafts to form a four-wheel trolley; the two adjustable supporting frames are arranged in a mirror symmetry mode and connected with the base through adjustable supporting frame locking bolts. The two supporting tires are fixedly installed on the two adjustable supporting frames through supporting tire fixing shafts respectively, the sample supporting ring is placed on the two supporting tires, and the sample supporting ring is locked with a test piece through a sample locking bolt; the two ends of the bandage are connected with the two adjustable supporting frames respectively. The device has the functions of supporting the fulcrum of the sample and adjusting the position, is easy to move along the direction of the sample, and realizes the position adjustment of the fulcrum.

Description

Technical Field

[0001] The utility model belongs to the field of auxiliary devices for resonance bending fatigue tests of pipes, and particularly relates to a fulcrum support and adjustment device for a resonance bending fatigue testing machine for pipes. Background Art

[0002] In recent years, China's oil and gas development has successively advanced into deep waters. Marine risers are important links and core components in deep-water oil and gas development and are the only channels connecting surface devices and subsea pipelines. Due to their long-term floating body movement under the action of tidal currents, the periodic loads cause them to bend repeatedly, and fatigue cracks are extremely likely to occur in the weak parts of the riser string, resulting in failure. In order to predict the fatigue life of the riser string, especially the connecting parts such as welds and heat-affected zones, and threaded joints. The use of resonance bending fatigue testing machines to test the fatigue life of pipes is becoming more and more widespread.

[0003] A resonance bending fatigue testing machine utilizes the resonance of pipes. The rotation of the motor drives the exciter to vibrate and then transmits the vibration to the pipes to make them vibrate. During the vibration process, the two fulcrums of the pipes do not displace. The fulcrum positions of different pipes are different and need to be moved and adjusted. The fulcrum support and adjustment device of the testing machine is an important part of the testing machine.

[0004] CN113899617A discloses a fulcrum position adjustment device for a resonance bending fatigue testing machine, including a support clamping part and a fulcrum moving part. Among them, the support clamping part includes a pipe support plate, a plurality of support rods connected to the pipe support plate, a support frame, a vertical air spring, and a horizontal air spring. There are relatively many rigid connections in its support connection part. The support rods are connected to the support plate by bolts, and the bolts are prone to fatigue fracture under the action of shear force during use. The contact part between the air spring and the support frame is prone to wear, and its overall structure is relatively complex, with many vulnerable parts, and the construction and maintenance costs are relatively high.

[0005] CN113514355A discloses a resonance bending fatigue testing machine, and its support system includes a support tire, a bottom plate, a connecting shaft, a locking support, a support structure, and a tire shaft. The connection method between its tire and the bottom plate may cause lateral movement during use, and it is inconvenient to adjust the fulcrum position along the direction of the specimen. Its support structure is a rigid connection without a shock-absorbing structure, which is prone to damage, and no specimen locking method is provided. Summary of the Utility Model

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a fulcrum support and adjustment device for a resonance bending fatigue testing machine that has a simple structure, is easy to maintain, can achieve fulcrum adjustment, has a shock-absorbing effect, and is applicable to a variety of different specifications of specimens.

[0007] The technical solution adopted by the utility model to solve the technical problem is:

[0008] A fulcrum support and adjustment device for a pipe resonance bending fatigue testing machine, comprising: a base, four base adjustment tires, two adjustable support frames, two support tires, a specimen support ring and a strap. The four base adjustment tires are respectively installed at the four corners of the base through base tire shafts; the base tire shafts are in two groups, connected to the lower part of the base and arranged at both ends of the base; the four base adjustment tires are respectively connected to the base tire shafts to form a four-wheel cart for convenient movement along the direction of the specimen, realizing the function of adjusting the fulcrum position, and the tires have a shock-absorbing effect. Bolt holes are opened in the upper part of the base, and the two adjustable support frames are arranged symmetrically in a mirror image and are respectively connected to the base through adjustable support frame locking bolts; the adjustable support frame includes a bottom plate, two side plates and a protruding arm, and the protruding arm is connected to the two side plates and protrudes laterally for the strap to tightly bind the specimen support ring and the support tire. Grooves are made in the upper part of each side plate for placing the support tire fixing shaft. Further, the adjustable support frame further includes two support plates which are respectively fixedly installed on the sides of the two side plates. The bottom plate of the adjustable support frame is provided with a plurality of mounting holes, and according to the use conditions, the installation position of the adjustable support frame on the base can be adjusted.

[0009] The two support tires are respectively fixedly installed on the two adjustable support frames through support tire fixing shafts, cannot rotate, and play a shock-absorbing and supporting role.

[0010] Further, a base locking device is further included. The base locking device is in two groups and is respectively installed at the middle parts of both ends of the base. The base locking device includes a screw lifting mechanism and a protruding head connected thereto. After the position is adjusted, the protruding head is inserted into the ground rail groove to realize locking.

[0011] Further, a tensioner is installed on the strap. After the strap is connected to the tensioner, both ends are connected to the protruding arms of the support frame, and the tensioner is used to tightly bind the middle part of the specimen support ring to realize flexible connection and fixation.

[0012] Further, the specimen support ring is placed on the two support tires, and the specimen support ring is locked with the specimen through a specimen locking bolt; different specifications of sample pipes can be applied by using support rings and adjustment bolts of different specifications and sizes.

[0013] The advantages and positive effects of the present utility model are:

[0014] 1. The present utility model has the functions of specimen fulcrum support and position adjustment. Through the tightening of the strap tensioning bolt, the specimen can be fixed to realize support; the whole is easy to move along the direction of the specimen to realize the adjustment of the fulcrum position.

[0015] 2. The utility model has a wide range of applications and can be used for sample tubes of various specifications. It can be adjusted in various ways, such as adjusting the position of the support frame, replacing support tires of different specifications, and replacing sample support rings of different specifications, so as to achieve a larger range of sample applications.

[0016] 3. The structure of the utility model is simple, easy to construct, with few vulnerable parts and convenient to replace, and the use and maintenance cost is low; it is fixed tightly with straps, easy to install and use, and reduces labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the front view of this support adjustment device;

[0018] Figure 2 is the side view of this support adjustment device;

[0019] Figure 3 is the top view of this support adjustment device;

[0020] Figure 4 is the schematic diagram of the adjustable support frame;

[0021] Marking: 1. Base tire shaft; 2. Base adjustment tire; 3. Base; 4. Base locking device; 5. Adjustable support frame; 6. Support tire; 7. Sample support ring; 8. Strap; 9. Tightener; 10. Support tire fixing shaft; 11. Adjustable support frame locking bolt; 12. Sample locking bolt; 13. Side plate; 14. Bottom plate; 15. Extension arm; 16. Support plate; 17. Groove; 18. Mounting hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following further details the present utility model through specific embodiments. The following embodiments are only descriptive and not restrictive, and the protection scope of the present utility model cannot be limited thereby.

[0023] As Figures 1-3 shown, the present utility model is a fulcrum support and adjustment device for a pipe resonance bending fatigue testing machine. There are two groups of this device, which are respectively located at both ends of the pipe sample. This device integrates position adjustment and support, has a vibration damping effect and stable support.

[0024] First, determine the positions of the two fulcrums of the sample, install the sample support ring 7 at the position of the sample tube fulcrum, select a suitable sample locking bolt 12 according to the outer diameter of the sample tube, tighten the sample locking bolt 12, and further lock the support ring 7 and the sample;

[0025] Adjust the position of this device in the testing machine. The four base adjustment tires 2 are connected to the base 3 through the base tire shaft 1. Adjust according to the positions of the previously installed specimen and the specimen support ring 7. Push the base 3 to make the base adjustment tire 2 roll to the appropriate position. The base locking device 4 has two groups, which are respectively located at the middle positions on both sides of the base 3. The lifting of the protruding head can be realized by turning the screw. After the tire position is adjusted, adjust the protruding length by tightening the screw of the base locking device 4 so that its protruding head is in close contact with the ground rail groove to obtain sufficient friction, and fix the position to lock this device so that it will no longer move during use.

[0026] There are two groups of adjustable support frames 5, which are located in the middle of the base 3. Each adjustable support frame 5 is composed of two side plates 13, two support plates 16, one protruding arm 15 and one bottom plate 14, and it is connected to the base 3 through the adjustable support frame locking bolt 11. As Figure 4 shown, there are multiple mounting holes 18 on the bottom plate of the adjustable support frame 5. According to the use conditions, the mounting position of the adjustable support frame 5 on the base 3 can be adjusted. Each of the two side plates 13 of the adjustable support frame 5 has a support plate 16 for support; the protruding arm 15 of the adjustable support frame 5 is connected to the two side plates 13 and protrudes laterally for connection with the binding strap 8; there are grooves 17 on the upper parts of the two side plates 13 of the adjustable support frame 5 for connecting with the support tire 6 through the support tire fixing shaft 10. The support tire 6 is fixed on the adjustable support frame 5 through the support tire fixing shaft 10, and it cannot rotate and is only used to support the specimen support ring 7. Different specifications of support tires 6 can be replaced according to the use situation to obtain a larger use range.

[0027] The usage method of the present utility model is as follows:

[0028] Place the specimen with the specimen support ring 7 installed on the support tire 6 so that the specimen support ring 7 is in close contact with the two support tires 6. Fix the specimen support ring 7 and the support tire 6 with the binding strap 8. The two ends of the binding strap are respectively hooked to the protruding arms on the sides of the two groups of adjustable support frames 5, and adjust the tensioner 9 to tighten the binding strap.

[0029] The above are only the preferred embodiments of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the inventive concept of the utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A fulcrum support and adjustment device for a pipe resonance bending fatigue testing machine, characterized in that: include: Base, Four base adjustment tires, the four base adjustment tires are respectively installed at the four corners of the base through the base tire shaft to form a four-wheeled vehicle; Two adjustable support frames, the two adjustable support frames are arranged in mirror symmetry and are respectively connected to the base through adjustable support frame locking bolts; Two supporting tires, the two supporting tires are respectively fixedly mounted on the two adjustable supporting frames through supporting tire fixing shafts, a sample support ring, the sample support ring is placed on the two supporting tires, and the sample support ring is locked with the test piece by a sample locking bolt; and a binding strap, wherein two ends of the binding strap are respectively connected to two adjustable support frames.

2. The fulcrum support and adjustment device for the pipe resonance bending fatigue testing machine according to claim 1 is characterized in that: The adjustable support frame includes a bottom plate, two side plates and an extension arm. The extension arm is connected to the two side plates and extends from the side to be connected to the strap. A groove is formed on the upper part of each side plate for placing a supporting tire fixing shaft.

3. The fulcrum support and adjustment device for the pipe resonance bending fatigue testing machine according to claim 2 is characterized in that: The adjustable support frame also includes two support plates, which are respectively fixed on the side surfaces of the two side plates.

4. The fulcrum support and adjustment device for a pipe resonance bending fatigue testing machine according to claim 2, characterized in that: A plurality of mounting holes are formed on the bottom plate.

5. The fulcrum support and adjustment device for a pipe resonance bending fatigue testing machine according to claim 1, characterized in that: It also includes a base locking device, which consists of two groups and is respectively installed at the middle part of both ends of the base.

6. The fulcrum support and adjustment device for the pipe resonance bending fatigue testing machine according to claim 5, characterized in that: The base locking device comprises a screw lifting mechanism and an extension head connected thereto. After the position is adjusted, the extension head is inserted into the ground rail groove to achieve locking.

7. The fulcrum support and adjustment device for a pipe resonance bending fatigue testing machine according to claim 1, characterized in that: A tensioner is installed on the binding belt.

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