CN203629918U - Device for manufacturing inverted U-shaped curved sample - Google Patents

Abstract

The utility model discloses a device for making a reverse U-shaped bending sample, which comprises a stand (1), an upper steel plate (7) fixed on the top of the stand (1) and a lower steel plate fixed on the bottom of the stand (1). (8), the platform (1), the upper steel plate (7) and the lower steel plate (8) form a loading space; it also includes a pressure rod (2), and one end of the pressure rod (2) is fixed on the upper steel plate (7) The lower surface and the other end are fixedly connected with a semi-pulley-shaped indenter (3); the platform (1) between the upper steel plate (7) and the lower steel plate (8) is provided with a slide plate (5) that can slide up and down along the platform. ); the slide plate (5) is provided with a sample support (4); between the slide plate (5) and the lower steel plate (8) is provided with a jacking device (6) for the slide plate (5). By adopting the technical proposal of the utility model, the bending sample of the reverse U-shaped small-diameter thin-walled tube can be made quickly and conveniently; and the structure is simple and compact, and easy to assemble.

Description

A device for making reverse U-shaped bending samples

technical field

The utility model belongs to the field of making U-shaped bending samples, in particular to a device for making reverse U-shaped bending samples used in stress corrosion tests of heat transfer tubes of nuclear power steam generators.

Background technique

Stress corrosion cracking is the most serious form of damage to heat transfer tubes of nuclear power steam generators. The research on stress corrosion cracking of heat transfer tubes will always be one of the major issues facing nuclear power plants. At present, the stress corrosion test of nuclear power steam generator heat transfer tube materials generally adopts uniaxial loading tensile specimens, compact tensile specimens, bent beam specimens, etc. These specimens are mainly used in larger castings or thicker workpieces Materials are generally made by wire cutting, machining and other methods. However, heat transfer tubes are generally small-diameter thin-walled tubes, and it is impossible to make the above types of samples. In addition, it is necessary to simulate the service stress state of inverted "U" heat transfer tubes, and the stress corrosion of "U"-shaped tubes by crevice corrosion. However, the single-reverse U-shaped and double-reverse U-shaped bending specimens can well meet the requirements. However, there is no standard document for making reverse U-shaped stress corrosion test specimens in China, and effective tools for making reverse U-shaped test samples are in a blank state.

Contents of the invention

Aiming at the defects existing in the prior art, the utility model provides a device for making reverse U-shaped bending samples, which can quickly and conveniently make samples of reverse U-shaped small-diameter thin-walled tubes; and has a simple and compact structure and is easy to assemble.

In order to achieve the above purpose, the technical solution adopted by the utility model is: provide a device for making a reverse U-shaped bending sample, including a stand, an upper steel plate affixed to the top of the stand, a lower steel plate affixed to the bottom end of the stand, The platform, the upper steel plate and the lower steel plate form a loading space; it also includes a pressure rod, one end of which is fixed on the lower surface of the upper steel plate, and the other end of the pressure rod is fixedly connected with a half pulley-shaped pressure head; the upper steel plate A slide plate that can slide up and down along the bench is provided on the platform between the lower steel plate; a sample support is provided on the slide plate; a lifting device for the slide plate is provided between the slide plate and the lower steel plate.

Further, the sample support includes a support plate arranged on the slide plate, two sets of shoulder frames symmetrically arranged on the support plate, and a bearing fixed on each set of shoulder frames.

Further, the distance between the two bearings is adjustable.

Further, the middle section of the two bearings is provided with a limit port, and the limit port is concentric with the central axis of the bearing.

Further, the jacking device is a jack.

Further, the pressure rod is fixed on the lower surface of the upper steel plate by bolts.

Further, the material of the stand, the pressure rod, the indenter, the sample holder and the slide plate are all A3 steel.

The beneficial technical effects of the utility model are: adopting the technical proposal of the utility model, it is convenient and fast to manufacture small-diameter thin-walled tube single-reverse U-shaped and double-reverse U-shaped bending samples; and by adjusting the distance between the bearings of the sample bracket, it can Make reverse U-shaped bending samples with different curvature radii; the pressure rod is connected with the upper steel plate by bolts, which can be easily disassembled, and the pressure rod and indenter can be easily replaced, so that U-shaped bending samples of different specifications can be made; the device is manufactured Simple, easy to operate and highly practical.

Description of drawings

Fig. 1 is the structural representation of the utility model making reverse U-shaped bending sample device;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is a schematic diagram of the sample holder in Fig. 1 .

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail.

As shown in Figures 1 and 2, it is a device for making a reverse U-shaped bending sample provided by the utility model, including a stand 1, which is fixed to an approximately elliptical upper steel plate 7 at the top of the stand 1, and affixed to the top of the stand 1. The lower steel plate 8 with a square bottom, the platform 1, the upper steel plate 7 and the lower steel plate 8 jointly form a loading space, and the lower surface of the upper steel plate 7 is connected with a pressure bar 2 by bolts, and the free end of the pressure bar 2 is welded to a semi-pulley structure. The indenter 3, the indenter 3 can be changed according to the outer diameter of the elbow and the radius of curvature of the reverse U-shaped elbow; the platform 1 between the upper steel plate 7 and the lower steel plate 8 is provided with an approximation that can slide up and down along the platform. An elliptical slide 5, the slide 5 is connected to the stand through a sliding bearing; the slide 5 is provided with a sample holder 4, and the sample holder 4 can move freely on the slide 5 so as to adjust the central plane and the center point; the slide 5 A device 6 for jacking up the slide plate 5 is provided between the lower steel plate 8 . The jacking device 6 is a jack, and the jack is placed on the lower steel plate 8, and its bracket is in contact with the lower surface of the slide plate 5.

As shown in Figure 3, described sample holder 4 comprises the bracket plate 43 that is arranged on the slide plate 5, two groups of shoulder frames 41 that are symmetrically arranged on the bracket plate 43, the bearing 42 that is fixed on every group of shoulder frame 41; Frame 41 is fixed in the groove of support plate with bolt. Among them, the distance between the two bearings can be adjusted, so that reverse U-shaped bending samples with different curvature radii can be produced.

The middle section of the two bearings is provided with a limit opening 44, which is concentric with the bearing 42, and can ensure that the two free ends of the U-shaped tube are parallel.

The material of the bench, pressure rod, pressure head, sample support and slide plate is all selected from A3 steel to meet the strength requirements; the jack can use 1-3 tons of standard parts, which is easy to use and low in cost.

The technical scheme adopting this structure can meet the requirements of making single-reverse U-shaped and double-reverse U-shaped bending samples; the structure is simple and the operation is convenient. It can quickly produce reverse U-shaped specimens with an outer diameter of 17-21mm and a thickness of 1.0-1.4mm; and by adjusting the distance between the bearings of the specimens, reverse U-shaped specimens with a curvature radius of 8-20mm can be produced; The adopted compression rods are connected by bolts, which can be easily disassembled and replaced, so that they can be used to make U-shaped samples of other specifications.

When making a SLR U-shaped sample, first adjust the distance between the two bearings of the sample support 4 according to the requirements, then place a semi-cylindrical soft aluminum rod with the same inner diameter as the sectioned tube on the limit port 44, and the sectioned tube test Place the sample on the soft aluminum rod and closely fit it, then adjust the center planes of the indenter 3, the sample holder 5 and the sectioned tube sample to the same vertical plane, and make the center of the indenter and the center of the sample Align the center, and finally, manually start the jack slowly, so that the indenter 3 is in close contact with the split-pipe sample, and the split-pipe deforms slowly along the indenter 3 until the two free sections of the split-pipe sample are parallel, thereby forming a single-reversed U-shape sample.

When making a double-reversed U-shaped sample, first adjust the distance between the two bearings of the sample holder 4 as required, then place a semi-cylindrical soft aluminum rod with the same inner diameter as the sectioned tube on the limit port 44, and place a The cut-pipe sample is placed on the soft aluminum rod and closely matched with it, while the other cut-pipe sample is placed on the previous cut-pipe sample, so that the center planes of the two cut-pipes coincide, and then the indenter 3 and the sample holder are placed 4 and the central plane of the split-pipe sample are adjusted to the same vertical plane, and the center of the indenter is aligned with the center of the sample. Finally, manually start the jack slowly to make the indenter 3 and the split-pipe sample close With contact, the split-pipe sample slowly deforms along the indenter 3 until the two free sections of the split-pipe sample are parallel, thus forming a double-reversed U-shaped sample.

The device for making reverse U-shaped bending specimens of the present invention is not limited to the above-mentioned specific embodiments. Those skilled in the art can obtain other embodiments according to the technical solutions of the present invention, which also belong to the technical innovation scope of the present invention.

Claims (7)

1. A device for making a reverse U-shaped bending sample, comprising a bench (1), an upper steel plate (7) fixed on the top of the bench (1) and a lower steel plate (8) fixed on the bottom of the bench (1) ), the pedestal (1), the upper steel plate (7) and the lower steel plate (8) form a loading space, which is characterized in that: it also includes a pressure rod (2), and one end of the pressure rod (2) is fixed on the upper steel plate On the lower surface of (7), the other end of the pressure rod (2) is fixedly connected with a semi-pulley-shaped indenter (3); on the platform (1) between the upper steel plate (7) and the lower steel plate (8), there is a A slide plate (5) that can slide up and down along the stand; the slide plate (5) is fixedly connected with a sample holder (4); between the slide plate (5) and the lower steel plate (8), there is a slide plate (5) Jack up the device (6). 2. A device for making reverse U-shaped bending samples according to claim 1, characterized in that: the sample holder (4) includes a holder plate (43) arranged on the slide plate (5), symmetrically arranged on Two groups of shoulder frames (41) on the support plate (43) and bearings (42) that are fixed on every group of shoulder frames (41). 3. A device for making a reverse U-shaped bending sample according to claim 2, characterized in that: the distance between the two bearings is adjustable. 4. A device for making a reverse U-shaped bending sample according to claim 3, characterized in that: the middle section of the two bearings is provided with a limit port (44), and the limit port (44) is connected with the bearing (42) concentric axis. 5. A device for making a reverse U-shaped bending sample according to claim 1, characterized in that: the jacking device (6) is a jack. 6. The device for making reverse U-shaped bending samples according to claim 1, characterized in that: the pressure rod (2) is fixed on the lower surface of the upper steel plate (7) by bolts. 7. A device for making a reverse U-shaped bending sample according to any one of claims 1-6, characterized in that: the bench (1), pressing rod (2), indenter (3), test The materials of sample support (4) and slide plate (5) all adopt A3 steel.

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