A device for testing the strength of a preformed metal tube

Abstract

The application belongs to the technical field of material strength testing, and specifically discloses a strength testing device for prefabricated metal pipes, which comprises a clamping testing mechanism, a double-mode driving mechanism, a top limiting mechanism and a rack, one end of the rack is provided with a sliding platform, the clamping testing mechanism comprises a sliding table assembly, an extrusion assembly and a gravity hammering assembly, the sliding table assembly is slidably arranged on the sliding platform, the extrusion assembly is arranged on the sliding table assembly, and the gravity hammering assembly is arranged on the rack. Through the driving control of the double-mode driving mechanism, the originally used motor for clamping can be automatically switched and used to provide power for impact testing after the clamping process is completed, and meanwhile, the clamping on the extrusion assembly can be maintained.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of material strength testing, and particularly relates to a strength testing device for prefabricated metal pipes. BACKGROUND

[0002] In the process of building installation, a large number of prefabricated pipes and pipe supporting members and connecting members are used, and these structures not only have static strength requirements, but also have impact resistance requirements for some building joints, elevator shafts and other parts.

[0003] The static bearing capacity of pipe fittings and other structural members can be easily detected, but the impact resistance of the material needs to be reciprocally impacted.

[0004] In order to better simulate the impact situation of prefabricated metal pipes or structural members in use and explore the impact resistance of the material, the application provides a device for testing pipe material by reciprocating impact. SUMMARY

[0005] In view of the above problems, the application provides a strength testing device for prefabricated metal pipes, which can explore the impact resistance of the pipe by reciprocally simulating the actual impact, and can automatically switch and provide power for impact testing after the clamping process is completed by driving control of the double-mode driving mechanism, and can also maintain the clamping of the extrusion assembly.

[0006] The technical scheme adopted by the application is as follows: the application provides a strength testing device for prefabricated metal pipes, which comprises a clamping testing mechanism, a double-mode driving mechanism, a top limiting mechanism and a rack, one end of the rack is provided with a sliding platform, the clamping testing mechanism comprises a sliding table assembly, an extrusion assembly and a gravity hammering assembly, the sliding table assembly is slidably arranged on the sliding platform, the extrusion assembly is arranged on the sliding table assembly, and the gravity hammering assembly is arranged on the rack.

[0007] The single driving source of the double-mode driving mechanism can first drive the sliding table assembly to slide, and when the sliding table assembly completes the clamping of the extrusion assembly, the driving of the sliding table assembly can be automatically stopped and changed to the driving of the gravity hammering assembly, and the clamping force of the sliding table assembly on the extrusion assembly can be maintained during the process.

[0008] Further, the sliding table assembly comprises a clamping sliding table and a return spring, the clamping sliding table is slidingly arranged on the sliding platform, symmetrically arranged on the clamping sliding table are limiting columns, the return spring is arranged between the clamping sliding table and the sliding platform, symmetrically arranged on the rack are cushion blocks, and the ends of the clamping pull rope are arranged on the clamping sliding table.

[0009] Preferably, the extrusion assembly comprises an extrusion box, an extrusion base, an angle adjusting support and a pipe material sample, the extrusion box is arranged on the clamping sliding table, the extrusion box is located between the limiting columns and the cushion blocks, the extrusion base is slidingly arranged in the extrusion box, a spring for resetting is arranged between the extrusion box and the extrusion base, the angle adjusting support is symmetrically arranged on the extrusion base, the angle of the angle adjusting support relative to the extrusion base can be adjusted, and the pipe material sample is detachably arranged at the end of the angle adjusting support.

[0010] By adjusting the angle of the angle adjusting support, the angle of the pipe material sample under impact can be changed, so as to explore the impact resistance of the pipe material sample under different angles.

[0011] Further preferably, the gravity hammering assembly comprises a sliding rod, a counterweight sand wheel and a bottom cavity, the sliding rod is arranged on the rack, the counterweight sand wheel and the bottom cavity are slidingly arranged on the sliding rod, the bottom cavity is located below the counterweight sand wheel, a bottom telescopic piston is slidingly arranged in the bottom cavity, a spring for resetting is arranged between the bottom cavity and the bottom telescopic piston, the counterweight sand wheel is arranged in an array, the other end of the pull rope is arranged on the lowermost counterweight sand wheel, and the bottom cavity and the extrusion box are connected through a pipeline.

[0012] By the descending of the counterweight sand wheel, the bottom cavity can be impacted, so as to cause the bottom telescopic piston to retract towards the bottom cavity, the bottom cavity and the extrusion box are connected through the pipeline, thereby providing power for the extrusion of the extrusion base, and by the reciprocating impact of the counterweight sand wheel, the state of the pipe material sample under periodic impact can be simulated, so as to explore the material performance of the pipe material sample.

[0013] Further, the double-mode driving mechanism comprises a double-drive transmission assembly, a winding assembly and a dialing assembly, the dialing assembly is rotationally arranged on the top limiting mechanism, the winding assembly is arranged on the rack, and the dialing assembly is arranged on the double-drive transmission assembly.

[0014] Preferably, the double-drive transmission assembly comprises a gear ring and a rotating support, the gear ring is rotationally arranged in the screw rod base, the rotating support is arranged on the screw rod base, a main shaft is rotationally arranged in the rotating support, the main shaft and the gear ring are coaxially arranged, fork supports are uniformly arranged at the bottom end of the main shaft, eccentric wheels are rotationally arranged at the ends of the fork supports, and the gear ring and the eccentric wheels are in meshing transmission.

[0015] By single driving of the driving motor, the main shaft and the gear ring can be respectively driven to rotate in different situations, which simplifies the structure and automatically switches the driving mode, and the clamping of the sliding table assembly is maintained when the gear ring is driven to rotate.

[0016] As a further preferred embodiment of the present application, the winding assembly comprises a driving motor, a center wheel and a clamping pull rope, the driving motor is arranged on the frame, the center wheel is fixedly connected to the output shaft of the driving motor, the center wheel and the eccentric wheel are in meshing transmission, and the clamping pull rope is wound on the main shaft, and the end of the clamping pull rope is arranged on the sliding table assembly.

[0017] As a further preferred embodiment of the present application, the shifting assembly comprises a shifting rod, a shifting rope and a fixed pulley, the shifting rod is fixedly connected to the outside of the gear ring, one end of the shifting rope is arranged on the frame, the other end of the shifting rope is arranged on the gravity hammering assembly, the fixed pulley is rotatably arranged on the frame, and the shifting rope and the fixed pulley are in rolling contact.

[0018] By shifting of the shifting rod on the shifting rope, the counterweight sand wheel can be reciprocatingly lifted and freely dropped along the sliding rod, so as to exert periodic impact stress on the pipe material sample.

[0019] Further, the top limiting mechanism is provided with a lifting driving assembly, and the lifting driving assembly is provided with a screw rod base, and the screw rod base is arranged on the frame.

[0020] The lifting driving assembly further comprises a screw rod motor and a screw rod body, the screw rod base and the screw rod motor are arranged on the frame, one end of the screw rod body is connected to the output shaft of the screw rod motor, and the other end of the screw rod body is rotatably arranged in the screw rod base.

[0021] As a preferred embodiment, the top limiting mechanism further comprises a lifting sliding assembly, and the lifting sliding assembly is arranged on the frame in a lifting manner.

[0022] As a further preferred embodiment of the present application, the lifting sliding assembly comprises a nut, a sliding block and a lifting sliding table, the nut is threadedly connected to the screw rod body, the sliding block is arranged on the frame in a lifting manner, the lifting sliding table is arranged on the sliding block, the sliding block is arranged in the protruding portion of the lifting sliding table, and the top limiting frame is further arranged on the lifting sliding table and in contact with the end of the pipe material sample.

[0023] The height of the top limiting frame can be actively adjusted to adapt to pipe material samples of different lengths and inclination angles.

[0024] The present application has the following beneficial effects by adopting the above structure:

[0025] (1) Through the single drive source of the double-mode driving mechanism, the sliding table assembly can be driven to slide first, and when the sliding table assembly clamps the extrusion assembly, the driving of the sliding table assembly can be automatically stopped and the driving of the gravity hammering assembly can be changed, and in this process, the clamping force of the sliding table assembly on the extrusion assembly can be maintained; the motor originally used to drive the sliding table assembly can not only drive the gravity hammering assembly without increasing the driving mechanism, but also automatically realize the switching control between the sliding table assembly and the gravity hammering assembly.

[0026] (2) By adjusting the angle of the angle adjusting support, the angle of the pipe material sample under impact can be changed, so that the impact resistance of the pipe material sample under different angles can be explored.

[0027] (3) Through the descent of the counterweight grinding wheel, the bottom cavity can be impacted, so that the bottom telescopic piston is retracted towards the bottom cavity, the bottom cavity and the extrusion box are connected through a pipeline, thereby providing power for the extension of the extrusion base, and through the reciprocating impact of the counterweight grinding wheel, the state of the pipe material sample under periodic impact can be simulated, so that the material performance of the pipe material sample can be explored.

[0028] (4) Through the single drive of the driving motor, the main shaft and the gear ring can be driven to rotate under different conditions, on the one hand, the structure is simplified, on the other hand, the driving mode can be automatically switched, and when the gear ring is driven to rotate, the clamping of the sliding table assembly is still maintained.

[0029] (5) Through the pushing of the pushing rod on the pushing rope, the counterweight grinding wheel can be reciprocatingly raised and freely dropped along the sliding rod, so as to apply periodic impact stress to the pipe material sample.

[0030] (6) The height of the top limiting frame can be actively adjusted to adapt to pipe material samples of different lengths and inclination angles. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A perspective view of a prefabricated metal pipe strength testing device is proposed in the present application Figure 1 ;

[0032] Figure 2 A perspective view of a prefabricated metal pipe strength testing device is proposed in the present application Figure 2 ;

[0033] Figure 3 A front view of a prefabricated metal pipe strength testing device is proposed in the present application

[0034] Figure 4 A left view of a prefabricated metal pipe strength testing device is proposed in the present application

[0035] Figure 5 for Figure 3 A cross-sectional view along the cutting line AA;

[0036] Figure 6 for Figure 3 A cross-sectional view along the cutting line BB;

[0037] Figure 7 for Figure 3 A cross-sectional view along the section line CC;

[0038] Figure 8 for Figure 4 A cross-sectional view along the cutting line DD;

[0039] Figure 9 for Figure 5 A magnified view of a section at point I;

[0040] Figure 10 for Figure 6 Enlarged view of a section at point II;

[0041] Figure 11 for Figure 7 A magnified view of section III in the middle.

[0042] The components include: 1. Clamping test mechanism; 2. Dual-mode drive mechanism; 3. Top limiting mechanism; 4. Frame; 5. Slide assembly; 6. Extrusion assembly; 7. Gravity hammer impact assembly; 8. Clamping slide; 9. Return spring; 10. Pad; 11. Extrusion chamber; 12. Extrusion base; 13. Angle adjustment bracket; 14. Pipe material sample; 15. Slide rod; 16. Counterweight grinding wheel; 17. Bottom cavity; 18. Limiting post; 19. Bottom telescopic piston; 20. Dual-drive transmission assembly; 21. Coil. 22. Winding assembly, 23. Actuating assembly, 24. Gear ring, 25. Rotating bracket, 26. Eccentric wheel, 27. Drive motor, 28. Center wheel, 29. Clamping rope, 30. Lever, 31. Actuating rope, 32. Main shaft, 33. Fork, 34. Lifting drive assembly, 35. Lifting sliding assembly, 36. Lead screw base, 37. Lead screw motor, 38. Lead screw body, 39. Nut, 40. Slider, 41. Lifting slide, 42. Top limit bracket, 43. Sliding platform, 44. Fixed pulley.

[0043] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0044] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments; based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0045] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0046] As shown in Figures 1-11 The present application provides a prefabricated metal pipe strength testing device, which comprises a clamping testing mechanism 1, a double-mode driving mechanism 2, a top limiting mechanism 3 and a rack 4, one end of the rack 4 is provided with a sliding platform 42, the clamping testing mechanism 1 comprises a sliding table assembly 5, an extrusion assembly 6 and a gravity hammering assembly 7, the sliding table assembly 5 is slidably arranged on the sliding platform 42, the extrusion assembly 6 is arranged on the sliding table assembly 5, and the gravity hammering assembly 7 is arranged on the rack 4.

[0047] Through a single driving source of the double-mode driving mechanism 2, the sliding table assembly 5 can be first driven to slide, and when the sliding table assembly 5 completes clamping on the extrusion assembly 6, the driving of the sliding table assembly 5 can be automatically stopped and switched to driving the gravity hammering assembly 7, and the clamping force of the sliding table assembly 5 on the extrusion assembly 6 can be maintained in this process; by using the motor originally used to drive the sliding table assembly 5, the driving of the gravity hammering assembly 7 can be realized without increasing the driving mechanism, and the switching control between the sliding table assembly 5 and the gravity hammering assembly 7 can be automatically realized.

[0048] The double-mode driving mechanism 2 comprises a double-drive transmission assembly 20, a winding assembly 21 and a dialing assembly 22, the dialing assembly 22 is rotatably arranged on the top limiting mechanism 3, the winding assembly 21 is arranged on the rack 4, and the dialing assembly 22 is arranged on the double-drive transmission assembly 20.

[0049] The double-drive transmission assembly 20 comprises a gear ring 23 and a rotating support 24, the gear ring 23 is rotatably arranged in a lead screw base 35, the rotating support 24 is arranged on the lead screw base 35, a main shaft 31 is rotatably arranged in the rotating support 24, the main shaft 31 and the gear ring 23 are coaxially arranged, forked supports 32 are uniformly arranged at the bottom end of the main shaft 31, eccentric wheels 25 are rotatably arranged at the ends of the forked supports 32, and the gear ring 23 and the eccentric wheels 25 are in meshing transmission.

[0050] By single driving of the driving motor 26, the main shaft 31 and the gear ring 23 can be driven to rotate in different situations, which simplifies the structure and automatically switches the driving mode, and the clamping of the sliding table assembly 5 is still maintained when the gear ring 23 is driven to rotate.

[0051] The winding assembly 21 comprises a driving motor 26, a center wheel 27 and a clamping pull rope 28. The driving motor 26 is arranged on the rack 4, the center wheel 27 is fixedly connected to the output shaft of the driving motor 26, the center wheel 27 and the eccentric wheel 25 are in meshing transmission, and the clamping pull rope 28 is wound on the main shaft 31. The end of the clamping pull rope 28 is arranged on the sliding table assembly 5.

[0052] The poking assembly 22 comprises a poking rod 29, a poking rope 30 and a fixed pulley 43. The poking rod 29 is fixedly connected to the outside of the gear ring 23. One end of the poking rope 30 is arranged on the rack 4, and the other end of the poking rope 30 is arranged on the gravity hammering assembly 7. The fixed pulley 43 is rotatably arranged on the rack 4, and the poking rope 30 and the fixed pulley 43 are in rolling contact.

[0053] By poking the poking rope 30 through the poking rod 29, the counterweight sand wheel 16 can be reciprocatingly lifted and freely dropped along the sliding rod 15, so as to exert periodic impact stress on the pipe material sample 14.

[0054] The sliding table assembly 5 comprises a clamping sliding table 8 and a reset spring 9. The clamping sliding table 8 is slidingly arranged on the sliding platform 42, limit posts 18 are symmetrically arranged on the clamping sliding table 8, the reset spring 9 is arranged between the clamping sliding table 8 and the sliding platform 42, cushion blocks 10 are symmetrically arranged on the rack 4, and the ends of the clamping pull rope 28 are arranged on the clamping sliding table 8.

[0055] The extrusion assembly 6 comprises an extrusion box 11, an extrusion base 12, an angle adjusting support 13 and a pipe material sample 14. The extrusion box 11 is arranged on the clamping sliding table 8, and the extrusion box 11 is located between the limit posts 18 and the cushion blocks 10. The extrusion base 12 is slidingly arranged in the extrusion box 11 in a clamping mode, a spring for resetting is arranged between the extrusion box 11 and the extrusion base 12, the angle adjusting support 13 is symmetrically arranged on the extrusion base 12, the angle of the angle adjusting support 13 relative to the extrusion base 12 can be adjusted, and the pipe material sample 14 is detachably arranged at the end of the angle adjusting support 13.

[0056] By adjusting the angle of the angle adjusting support 13, the angle of the pipe material sample 14 subjected to impact can be changed, so as to explore the impact resistance of the pipe material sample 14 under different angles.

[0057] The gravity hammering assembly 7 comprises a sliding rod 15, a counterweight sand wheel 16 and a bottom cavity 17, the sliding rod 15 is arranged on the rack 4, the counterweight sand wheel 16 and the bottom cavity 17 are slidingly arranged on the sliding rod 15, the bottom cavity 17 is located below the counterweight sand wheel 16, a bottom telescopic piston 19 is slidingly arranged in the bottom cavity 17, a spring for resetting is arranged between the bottom cavity 17 and the bottom telescopic piston 19, the counterweight sand wheel 16 is arranged in an array, the other end of the pulling rope 30 is arranged on the lowermost counterweight sand wheel 16, and the bottom cavity 17 and the extrusion box body 11 are connected through a pipeline.

[0058] Through the descending of the counterweight sand wheel 16, the bottom cavity 17 can be impacted, so that the bottom telescopic piston 19 is retracted towards the bottom cavity 17, the bottom cavity 17 and the extrusion box body 11 are connected through a pipeline, thereby providing power for the extension of the extrusion base 12, through the reciprocating impact of the counterweight sand wheel 16, the state of the pipe material sample 14 subjected to periodic impact can be simulated, so as to explore the material performance of the pipe material sample 14.

[0059] The top limiting mechanism 3 is provided with a lifting driving assembly 33, the lifting driving assembly 33 is provided with a screw rod base 35, and the screw rod base 35 is arranged on the rack 4.

[0060] The lifting driving assembly 33 further comprises a screw rod motor 36 and a screw rod body 37, the screw rod base 35 and the screw rod motor 36 are arranged on the rack 4, one end of the screw rod body 37 is connected with an output shaft of the screw rod motor 36, and the other end of the screw rod body 37 is rotatably arranged in the screw rod base 35.

[0061] The top limiting mechanism 3 further comprises a lifting sliding assembly 34, and the lifting sliding assembly 34 is arranged on the rack 4.

[0062] The lifting sliding assembly 34 comprises a nut 38, a sliding block 39 and a lifting sliding table 40, the nut 38 is threadedly connected with the screw rod body 37, the sliding block 39 is arranged on the rack 4 in a lifting mode, the lifting sliding table 40 is arranged on the sliding block 39, the sliding block 39 is arranged in a protruding portion of the lifting sliding table 40, and a top limiting frame 41 is further arranged on the lifting sliding table 40, and the top limiting frame 41 is in contact with the tail end of the pipe material sample 14.

[0063] The height of the top limiting frame 41 can be actively adjusted to adapt to pipe material samples 14 of different lengths and inclination angles.

[0064] In specific use, first, the user needs to install the pipe material sample 14 to be tested on the angle adjusting support 13, and the angle adjusting of the angle adjusting support 13 is completed, then the extrusion box body 11 is placed on the clamping sliding table 8 and abuts against the cushion block 10, at this time, the other side of the extrusion box body 11 is not in contact with the limiting column 18; then the screw rod body 37 is driven to rotate through the screw rod base 35, and the lifting sliding table 40 is lowered through the threaded transmission between the screw rod body 37 and the nut 38, until the end of the pipe material sample 14 is clamped into the groove of the top limiting frame 41 and abuts against the groove.

[0065] Then the driving motor 26 is driven, in the initial state, both the main shaft 31 and the rotating support 24 can rotate, but since the rotating resistance of the gear ring 23 in the screw rod base 35 is greater than the rotating resistance of the main shaft 31, when the central wheel 27 starts to rotate, the gear ring 23 remains stationary, the eccentric wheel 25 will rotate the main shaft 31 through the fork frame 32 at the same time, at this time, the clamping pull rope 28 will be wound by the main shaft 31, and at the same time, the clamping sliding table 8 is pulled to slide against the elastic force of the return spring 9, in the process of sliding of the clamping sliding table 8, the limiting column 18 gradually approaches the extrusion box body 11.

[0066] After the limiting column 18 abuts against the extrusion box body 11, the clamping sliding table 8 cannot continue to slide, that is, at this time, the main shaft 31 cannot continue to rotate, at this time, the central wheel 27 will rotate the gear ring 23 through the eccentric wheel 25, and the limiting column 18 always maintains the clamping effect on the extrusion box body 11;

[0067] When the gear ring 23 rotates, the push rod 29 rotates together, and the push rod 29 pushes the push rope 30, through the lifting and pulling of the push rope 30, all the counterweight grinding wheels 16 rise along the sliding rod 15, and after the push rod 29 and the push rope 30 are separated, they fall together, through the way of converting the potential energy into kinetic energy, the bottom cavity 17 is impacted, when the bottom cavity 17 is impacted, the bottom telescopic piston 19 retracts towards the bottom cavity 17, and the liquid in the bottom cavity 17 has a tendency to flow towards the extrusion box body 11;

[0068] Each group of counterweight grinding wheels 16 are connected by magnetic sheets, in the case that the lifting height of the counterweight grinding wheels 16 is the same, by changing the number of the counterweight grinding wheels 16, the impact force of the test can be adjusted.

[0069] When the liquid in the bottom cavity 17 enters the extrusion box 11, it will cause the extrusion base 12 to rise, but since the height of the top limiting frame 41 remains unchanged during the test, the rising of the extrusion base 12 will impact the pipe material sample 14, and through the reciprocating impact, the material performance of the pipe material sample 14 can be tested. After a certain number of tests with a certain impact force, the pipe material sample 14 is removed, and the deformation or damage of the pipe material sample 14 is measured.

[0070] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0071] The above describes the present application and its embodiments, which are not limited, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired by it, without departing from the purpose of the present application, without creative design, similar structure and embodiments of the technical solution can be designed, which should belong to the protection scope of the present application.

Claims

1. A strength testing device for prefabricated metal pipes, characterized in that: It includes a clamping test mechanism (1), a dual-mode drive mechanism (2), a top limiting mechanism (3), and a frame (4). One end of the frame (4) is provided with a sliding platform (42). The clamping test mechanism (1) includes a slide assembly (5), a pressing assembly (6), and a gravity hammer assembly (7). The slide assembly (5) is slidably disposed on the sliding platform (42), the pressing assembly (6) is disposed on the slide assembly (5), and the gravity hammer assembly (7) is disposed on the frame (4). The dual-mode drive mechanism (2) includes a dual-drive transmission assembly (20), a winding assembly (21), and a toggle assembly (22). The toggle assembly (22) is rotatably mounted on the top limiting mechanism (3), the winding assembly (21) is mounted on the frame (4), and the toggle assembly (22) is mounted on the dual-drive transmission assembly (20). The dual-mode drive mechanism (2) can not only drive the gravity hammer assembly (7) without adding a drive mechanism, but also automatically switch between the slide assembly (5) and the gravity hammer assembly (7). The top limiting mechanism (3) is provided with a lifting drive assembly (33), the lifting drive assembly (33) is provided with a lead screw base (35), and the lead screw base (35) is provided on the frame (4); The dual-drive transmission assembly (20) includes a gear ring (23) and a rotating bracket (24). The gear ring (23) is rotatably mounted in the lead screw base (35). The rotating bracket (24) is mounted on the lead screw base (35). A main shaft (31) is rotatably mounted in the rotating bracket (24). The main shaft (31) and the gear ring (23) are coaxially arranged. A fork (32) is evenly distributed in a ring at the bottom end of the main shaft (31). An eccentric wheel (25) is rotatably mounted at the end of the fork (32). The gear ring (23) and the eccentric wheel (25) mesh and drive each other. The winding assembly (21) includes a drive motor (26), a center wheel (27), and a clamping rope (28). The drive motor (26) is mounted on the frame (4). The center wheel (27) is fixed to the output shaft of the drive motor (26). The center wheel (27) and the eccentric wheel (25) mesh and drive each other. The clamping rope (28) is wound on the main shaft (31). The end of the clamping rope (28) is located on the slide assembly (5). The actuating assembly (22) includes a lever (29), a rope (30), and a fixed pulley (43). The lever (29) is fixed to the outside of the gear ring (23). One end of the rope (30) is mounted on the frame (4), and the other end of the rope (30) is mounted on the gravity hammer assembly (7). The fixed pulley (43) is rotatably mounted on the frame (4), and the rope (30) and the fixed pulley (43) are in rolling contact. The slide assembly (5) includes a clamping slide (8) and a return spring (9). The clamping slide (8) is slidably disposed on the sliding platform (42). Limiting posts (18) are symmetrically disposed on the clamping slide (8). The return spring (9) is disposed between the clamping slide (8) and the sliding platform (42). Pads (10) are symmetrically disposed on the frame (4). The end of the clamping pull rope (28) is disposed on the clamping slide (8).

2. The strength testing device for a prefabricated metal pipe according to claim 1, characterized in that: The extrusion assembly (6) includes an extrusion box (11), an extrusion base (12), an angle adjustment bracket (13), and a pipe material sample (14). The extrusion box (11) is placed on a clamping slide (8). The extrusion box (11) is located between a limiting post (18) and a pad (10). The extrusion base (12) is engaged and slidably disposed in the extrusion box (11). A spring for resetting is provided between the extrusion box (11) and the extrusion base (12). The angle adjustment bracket (13) is symmetrically disposed on the extrusion base (12). The angle of the angle adjustment bracket (13) relative to the extrusion base (12) is adjustable. The pipe material sample (14) is detachably disposed at the end of the angle adjustment bracket (13).

3. The strength testing device for a prefabricated metal pipe according to claim 2, characterized in that: The gravity hammer assembly (7) includes a slide rod (15), a counterweight grinding wheel (16), and a bottom cavity (17). The slide rod (15) is mounted on the frame (4). The counterweight grinding wheel (16) and the bottom cavity (17) are slidably mounted on the slide rod (15). The bottom cavity (17) is located below the counterweight grinding wheel (16). A bottom telescopic piston (19) is slidably mounted in the bottom cavity (17). A spring for resetting is provided between the bottom cavity (17) and the bottom telescopic piston (19). The counterweight grinding wheels (16) are arranged in several groups. The other end of the pull rope (30) is mounted on the lowest counterweight grinding wheel (16). The bottom cavity (17) and the extrusion box (11) are connected by a pipe.

4. The strength testing device for a prefabricated metal pipe according to claim 3, characterized in that: The lifting drive assembly (33) also includes a lead screw motor (36) and a lead screw body (37). The lead screw base (35) and the lead screw motor (36) are mounted on the frame (4). One end of the lead screw body (37) is connected to the output shaft of the lead screw motor (36), and the other end of the lead screw body (37) is rotatably mounted in the lead screw base (35).

5. The strength testing device for a prefabricated metal pipe according to claim 4, characterized in that: The top limiting mechanism (3) also includes a lifting and sliding assembly (34), which is lifted and lowered on the frame (4).

6. The strength testing device for a prefabricated metal pipe according to claim 5, characterized in that: The lifting and sliding assembly (34) includes a nut (38), a slider (39), and a lifting slide (40). The nut (38) is threadedly connected to the lead screw body (37). The slider (39) is lifted and lowered on the frame (4). The lifting slide (40) is located on the slider (39). The slider (39) is located in the protrusion of the lifting slide (40). The lifting slide (40) is also provided with a top limiting frame (41). The top limiting frame (41) is in contact with the end of the pipe material sample (14).

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