Device for testing tensile strength of galvanized pipe

Abstract

The utility model relates to the technical field of tensile testing equipment, in particular to a tensile strength testing device for a galvanized pipe. Comprising a tempered glass box and two clamping devices. The two clamping devices are symmetrically installed at the upper end and the lower end in the tempered glass box. The clamping device comprises a pipeline outer wall clamping mechanism and a pipeline inner wall clamping mechanism; the pipeline outer wall clamping mechanism comprises a plurality of first arc-shaped clamping plates arranged in an annular array and a first driving assembly used for driving the first arc-shaped clamping plates to move synchronously. The pipeline inner wall clamping mechanism comprises a plurality of second arc-shaped clamping plates arranged in the annular array and a second driving assembly used for driving the second arc-shaped clamping plates to move synchronously. And a first hydraulic cylinder for driving the upper end mounting seat to move is mounted on the tempered glass box. The clamping device has the advantages of being stable in clamping and high in applicability.

Description

Technical Field

[0001] This utility model relates to the technical field of tensile testing equipment, and in particular to a device for testing the tensile strength of galvanized pipes. Background Technology

[0002] Galvanized pipe, also known as galvanized steel pipe, is divided into two types: hot-dip galvanized and electro-galvanized. Hot-dip galvanized pipe has a thick zinc coating, which has the advantages of uniform coating, strong adhesion and long service life.

[0003] In existing technologies, when testing galvanized pipes, because galvanized pipes have a hollow structure, the pipe fittings are usually clamped at multiple points on the outer wall. If the pipe fittings have good tensile strength, it is necessary to increase the clamping force on the ends of the pipe fittings. However, increasing the clamping force can easily lead to bending deformation of the pipe fitting ends, which in turn reduces the contact area between the clamping device and the pipe fittings. Furthermore, the deformation of the pipe fittings can affect the accuracy of the test results. Utility Model Content

[0004] The purpose of this invention is to address the problems existing in the background technology by proposing a device for testing the tensile strength of galvanized pipes.

[0005] The technical solution of this utility model is a galvanized pipe tensile strength testing device, comprising:

[0006] Tempered glass case;

[0007] Two clamping devices are symmetrically installed inside the tempered glass case at the upper and lower ends. The clamping devices include a pipe outer wall clamping mechanism and a pipe inner wall clamping mechanism. The pipe outer wall clamping mechanism includes a plurality of first arc-shaped clamping plates arranged in a circular array and a first drive assembly for driving the plurality of first arc-shaped clamping plates to move synchronously. The pipe inner wall clamping mechanism includes a plurality of second arc-shaped clamping plates arranged in a circular array and a second drive assembly for driving the plurality of second arc-shaped clamping plates to move synchronously. A first hydraulic cylinder for driving the upper mounting base to move is installed on the tempered glass case.

[0008] Preferably, a U-shaped frame is connected to the mounting base at the lower end, a fixing plate is connected to the bottom of the inner wall of the tempered glass box, and a pressure sensor is installed between the fixing plate and the U-shaped frame.

[0009] Preferably, a camera is installed on the side wall of the tempered glass case.

[0010] Preferably, the first drive assembly includes a third hydraulic cylinder, an annular housing, and a plurality of second elastic telescopic members respectively connected to a plurality of first arc-shaped clamps. Push blocks are connected to the outer sides of the plurality of first arc-shaped clamps. The annular housing has a trumpet-shaped structure. The plurality of first arc-shaped clamps are located on the inner side of the annular housing. The third hydraulic cylinder is mounted on the side of the mounting base away from the annular housing. An annular plate is connected to the output shaft of the third hydraulic cylinder. A plurality of connecting rods that move through the mounting base are connected between the annular plate and the annular housing. The plurality of second elastic telescopic members are mounted on the mounting base.

[0011] Preferably, the second elastic telescopic member includes a second sleeve, a second movable rod, a second spring, and a second connecting slider. The second sleeve is connected to the mounting base, one end of the second movable rod is slidably disposed inside the second sleeve and connected to the second connecting slider, and the second spring is sleeved and mounted on the second movable rod.

[0012] Preferably, the second drive assembly includes a cone, a second hydraulic cylinder, and a plurality of first elastic telescopic members respectively connected to a plurality of second arc-shaped clamps. A hydraulic cylinder mounting bracket is connected to the mounting base, the second hydraulic cylinder is mounted on the hydraulic cylinder mounting bracket, the cone is connected to the output shaft of the second hydraulic cylinder, the tip of the cone is placed at the center of the plurality of second arc-shaped clamps, and the plurality of first elastic telescopic members are all mounted on the mounting base.

[0013] Preferably, the first elastic telescopic member includes a first sleeve, a first movable rod, a first spring, and a first limiting slider, wherein the first sleeve is connected to the mounting base, the end of the first movable rod is slidably disposed inside the first sleeve and connected to the first limiting slider, and the first spring is disposed inside the first sleeve.

[0014] Preferably, the tempered glass case has a rotating door.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: the present invention can realize the synchronous clamping of the inner and outer walls of the pipe, improve the clamping area of ​​the pipe fitting, strengthen the fixing effect of the pipe fitting, prevent the pipe fitting from loosening, so as to improve the accuracy of the test. The synchronous clamping of the inner and outer walls can avoid the bending deformation of the pipe fitting end caused by excessive clamping force, and it is suitable for fixing pipe fittings of various diameters. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a cross-sectional view of the present invention.

[0018] Figure 3 and Figure 4 These are all schematic diagrams of the clamping device in this utility model.

[0019] Figure 5 This is a cross-sectional view of the first elastic telescopic component in this utility model.

[0020] Figure 6 This is a cross-sectional view of the second elastic telescopic member in this utility model.

[0021] Reference numerals: 1. Tempered glass case; 2. Case door; 3. Base; 4. Camera; 5. Mounting base; 6. First hydraulic cylinder; 7. U-shaped frame; 8. Fixing plate; 9. Pressure sensor; 10. First arc-shaped clamping plate; 11. Second arc-shaped clamping plate; 12. Cone; 13. Second hydraulic cylinder; 14. Hydraulic cylinder mounting bracket; 15. Annular plate; 16. Third hydraulic cylinder; 17. Annular shell; 18. First elastic telescopic component; 181. First sleeve; 182. First movable rod; 183. First spring; 184. First limiting slider; 19. Second elastic telescopic component; 191. Second sleeve; 192. Second movable rod; 193. Second spring; 194. Second connecting slider; 20. Connecting rod; 21. Push block. Detailed Implementation

[0022] Example 1

[0023] like Figures 1-6 As shown in the figure, the galvanized pipe tensile strength testing device proposed in this embodiment includes a tempered glass box 1 and two clamping devices.

[0024] A door 2 is rotatably mounted on the tempered glass box 1. The door 2 is designed to prevent the pipe fittings from being damaged during testing. A camera 4 is installed on the side wall of the tempered glass box 1. The camera 4 is designed to record the entire testing process. By playing back the video, the moment of deformation and the moment of breakage of the pipe fittings can be observed.

[0025] Two clamping devices are symmetrically installed inside the tempered glass box 1 at the upper and lower ends; the clamping devices include a pipe outer wall clamping mechanism and a pipe inner wall clamping mechanism.

[0026] The pipe outer wall clamping mechanism includes a plurality of first arc-shaped clamping plates 10 arranged in a circular array and a first drive assembly for driving the plurality of first arc-shaped clamping plates 10 to move synchronously. The first drive assembly includes a third hydraulic cylinder 16, an annular housing 17, and a plurality of second elastic telescopic members 19 respectively connected to the plurality of first arc-shaped clamping plates 10. Push blocks 21 are connected to the outer sides of the plurality of first arc-shaped clamping plates 10. The annular housing 17 has a trumpet-shaped structure, and the plurality of first arc-shaped clamping plates 10 are all located on the inner side of the annular housing 17. The third hydraulic cylinder 16 is mounted on the mounting base 5 on the side away from the annular housing 17. An annular plate 15 is connected to the output shaft of the third hydraulic cylinder 16. The annular plate 15 and the annular housing are connected to each other. Multiple connecting rods 20 are connected between the annular housing 17 and the mounting base 5. Multiple second elastic telescopic components 19 are installed on the mounting base 5. The second elastic telescopic component 19 includes a second sleeve 191, a second movable rod 192, a second spring 193, and a second connecting slider 194. The second sleeve 191 is connected to the mounting base 5. One end of the second movable rod 192 is slidably disposed inside the second sleeve 191 and connected to the second connecting slider 194. The second spring 193 is sleeved on the second movable rod 192. The second elastic telescopic component 19 is provided to enable multiple first arc-shaped clamping plates 10 to move outward and reset synchronously after the annular housing 17 is separated from the push block 21.

[0027] The pipe inner wall clamping mechanism includes a plurality of second arc-shaped clamping plates 11 arranged in a circular array and a second drive assembly for driving the plurality of second arc-shaped clamping plates 11 to move synchronously. The second drive assembly includes a cone 12, a second hydraulic cylinder 13 and a plurality of first elastic telescopic members 18 respectively connected to the plurality of second arc-shaped clamping plates 11. A hydraulic cylinder mounting bracket 14 is connected to the mounting base 5. The second hydraulic cylinder 13 is mounted on the hydraulic cylinder mounting bracket 14. The cone 12 is connected to the output shaft of the second hydraulic cylinder 13. The tip of the cone 12 is placed at the center of the plurality of second arc-shaped clamping plates 11. The plurality of first elastic telescopic members 18 are all mounted on the mounting base 5. The first elastic telescopic member 18 includes a first sleeve 181, a first movable rod 182, a first spring 183, and a first limiting slider 184. The first sleeve 181 is connected to the mounting base 5. The end of the first movable rod 182 is slidably disposed inside the first sleeve 181 and connected to the first limiting slider 184. The first spring 183 is disposed inside the first sleeve 181. The first elastic telescopic member 18 enables the cone 12 to automatically move inward after it separates from the second arc-shaped clamping plate 11. A first hydraulic cylinder 6 is installed on the tempered glass box 1 to drive the upper mounting base 5 to move.

[0028] Specifically, when testing the pipe fitting (galvanized pipe), the chamber door 2 is rotated and opened, and the pipe fitting is placed between two clamping devices. The bottom end of the pipe fitting is first fixed, positioning it between the first arc-shaped clamping plate 10 and the second arc-shaped clamping plate 11. Simultaneously, the second hydraulic cylinder 13 and the third hydraulic cylinder 16 are activated. The second hydraulic cylinder 13 drives the cone 12 to move, thus pushing multiple second arc-shaped clamping plates 11 outwards synchronously. At this time, the multiple second arc-shaped clamping plates 11 clamp the inner wall of the pipe fitting. The first elastic telescopic member 18 is set to assist the second arc-shaped clamping plates 11 in automatic reset. The third hydraulic cylinder 16 drives the annular plate 15 to move, and the annular plate 15 drives the annular housing 17 to move. 7. Multiple push blocks 21 are squeezed and driven to move inward synchronously, thereby driving multiple first arc-shaped clamping plates 10 to move inward synchronously to clamp the outer wall of the pipe fitting. The second elastic telescopic member 19 is provided to assist the automatic reset of the first arc-shaped clamping plate 10. Then, the upper clamping device is driven to move downward by the first hydraulic cylinder 6, so that the upper end of the pipe fitting is placed in the gap between the upper first arc-shaped clamping plate 10 and the second arc-shaped clamping plate 11. Then, the upper end of the pipe fitting is fixed according to the above method. Finally, the upper clamping device is driven to move upward by the first hydraulic cylinder 6 to realize the testing of the pipe fitting. During this process, the lower clamping device is in a stationary state.

[0029] In summary, this technical solution has the following advantages: the external and internal clamping mechanisms of the pipe can clamp and fix the inner and outer walls of the pipe, increasing the clamping area of ​​the pipe fittings and avoiding bending deformation of the pipe fitting ends due to excessive clamping force. It has a better clamping effect and is suitable for fixing pipe fittings of various diameters.

[0030] Example 2

[0031] like Figure 2 As shown in the figure, the galvanized pipe tensile strength testing device proposed in this embodiment has the following features compared to Embodiment 1. In this embodiment, a U-shaped frame 7 is connected to the mounting base 5 at the lower end, and a fixing plate 8 is connected to the bottom of the inner wall of the tempered glass box 1. A pressure sensor 9 is installed between the fixing plate 8 and the U-shaped frame 7. Specifically, a base 3 is provided at the bottom of the tempered glass box 1, and the U-shaped frame 7 is placed on the base 3. During the tensile strength testing of the pipe fitting, the pressure sensor 9 is used to detect the pressure value caused by the U-shaped frame 7, thereby enabling the monitoring of the change in tensile force during the test.

[0032] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A device for testing the tensile strength of galvanized pipes, characterized in that, include: Tempered glass case (1); Two clamping devices are symmetrically installed at the upper and lower ends of the interior of the tempered glass box (1); the clamping devices include a pipe outer wall clamping mechanism and a pipe inner wall clamping mechanism; the pipe outer wall clamping mechanism includes a plurality of first arc-shaped clamps (10) arranged in a ring array and a first drive assembly for driving the plurality of first arc-shaped clamps (10) to move synchronously; the pipe inner wall clamping mechanism includes a plurality of second arc-shaped clamps (11) arranged in a ring array and a second drive assembly for driving the plurality of second arc-shaped clamps (11) to move synchronously; a first hydraulic cylinder (6) for driving the upper mounting seat (5) to move is installed on the tempered glass box (1).

2. The galvanized pipe tensile strength testing device according to claim 1, characterized in that, A U-shaped frame (7) is connected to the mounting base (5) at the lower end, and a fixing plate (8) is connected to the bottom of the inner wall of the tempered glass box (1). A pressure sensor (9) is installed between the fixing plate (8) and the U-shaped frame (7).

3. The galvanized pipe tensile strength testing device according to claim 1, characterized in that, A camera (4) is installed on the side wall of the tempered glass case (1).

4. The galvanized pipe tensile strength testing device according to claim 1, characterized in that, The first drive assembly includes a third hydraulic cylinder (16), an annular housing (17), and multiple second elastic telescopic members (19) connected to multiple first arc-shaped clamps (10). Push blocks (21) are connected to the outer sides of the multiple first arc-shaped clamps (10). The annular housing (17) has a trumpet-shaped structure. The multiple first arc-shaped clamps (10) are located on the inner side of the annular housing (17). The third hydraulic cylinder (16) is mounted on the mounting base (5) on the side away from the annular housing (17). An annular plate (15) is connected to the output shaft of the third hydraulic cylinder (16). Multiple connecting rods (20) that move through the mounting base (5) are connected between the annular plate (15) and the annular housing (17). The multiple second elastic telescopic members (19) are all mounted on the mounting base (5).

5. The galvanized pipe tensile strength testing device according to claim 4, characterized in that, The second elastic telescopic component (19) includes a second sleeve (191), a second movable rod (192), a second spring (193), and a second connecting slider (194). The second sleeve (191) is connected to the mounting base (5). One end of the second movable rod (192) is slidably disposed inside the second sleeve (191) and connected to the second connecting slider (194). The second spring (193) is sleeved and installed on the second movable rod (192).

6. The galvanized pipe tensile strength testing device according to claim 1, characterized in that, The second drive assembly includes a cone (12), a second hydraulic cylinder (13), and a plurality of first elastic telescopic members (18) connected to a plurality of second arc-shaped clamps (11). A hydraulic cylinder mounting bracket (14) is connected to the mounting base (5). The second hydraulic cylinder (13) is mounted on the hydraulic cylinder mounting bracket (14). The cone (12) is connected to the output shaft of the second hydraulic cylinder (13). The tip of the cone (12) is located at the center of the plurality of second arc-shaped clamps (11). The plurality of first elastic telescopic members (18) are all mounted on the mounting base (5).

7. The galvanized pipe tensile strength testing device according to claim 6, characterized in that, The first elastic telescopic member (18) includes a first sleeve (181), a first movable rod (182), a first spring (183), and a first limiting slider (184). The first sleeve (181) is connected to the mounting base (5). The end of the first movable rod (182) is slidably disposed inside the first sleeve (181) and connected to the first limiting slider (184). The first spring (183) is disposed inside the first sleeve (181).

8. The galvanized pipe tensile strength testing device according to claim 1, characterized in that, A door (2) is rotatably mounted on the tempered glass case (1).

Images