Steel bar and steel pipe bending tester

Abstract

The utility model discloses a steel bar and steel pipe bending testing machine which comprises a machine table and a rack, and the rack is arranged at the upper part of the machine table. A lifting hydraulic cylinder is arranged on the top of the rack, and a pressing head assembly is arranged in the rack. The pressing head assembly comprises a connecting piece and a pressing head, a polygonal protruding block is arranged at the top of the connecting piece, the top of the polygonal protruding block is a prismatic table, and a groove matched with the polygonal protruding block is formed in the telescopic end of the lifting hydraulic cylinder. A plug pin is arranged at the telescopic end of the lifting hydraulic cylinder and penetrates through the polygonal protruding block and the pressing head to be detachably connected with the connecting piece. The convenience of replacing the pressure head can be improved through the connecting piece, the manpower consumption is reduced, and the working efficiency is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical testing equipment, in particular to a bending testing machine for steel bars and steel pipes. Background Art

[0002] When testing the bending properties of steel bars and steel pipes, a bending testing machine is generally required. The conventional testing process is as follows: First, select a pressure head that meets the testing standards, then adjust the distance between the idler rollers, place both ends of the test sample on the idler rollers, lower the pressure head by a certain distance, apply pressure to the middle of the test sample with the pressure head, and the test sample bends by a certain angle. Finally, observe the surface condition of the sample. During actual testing, a small pressure head can be directly thread-assembled to the telescopic end of the hydraulic cylinder; however, when using a larger pressure head, due to its large weight, it consumes a great deal of physical strength for the operator to rotate or move the pressure head. The process of assembling or disassembling it is not convenient using a simple thread-assembly method. Content of the Utility Model

[0003] To solve the above technical problems, the utility model provides a bending testing machine for steel bars and steel pipes.

[0004] The technical solution of the utility model is as follows: A bending testing machine for steel bars and steel pipes includes a machine table and a frame. A frame is provided on the upper part of the machine table. A lifting hydraulic cylinder is provided at the top of the frame, and a pressure head assembly is provided inside the frame. The pressure head assembly includes a connecting piece and a pressure head. A polygonal convex block is provided at the top of the connecting piece, and the top of the polygonal convex block is a frustum of a pyramid. A groove for cooperating with the polygonal convex block is provided at the telescopic end of the lifting hydraulic cylinder. A pin is provided at the telescopic end of the lifting hydraulic cylinder, the pin passes through the polygonal convex block, and the pressure head is detachably connected to the connecting piece.

[0005] Further, an operation panel is provided on the machine table, and an emergency stop button, a hydraulic pressure gauge, and a display screen are provided on the operation panel.

[0006] Further, the frame includes a base and an upper plate, and a plurality of uniformly distributed columns are provided between the base and the upper plate. Distance-adjusting mechanisms are provided on both sides of the base, and a lifting hydraulic cylinder is provided on the upper plate.

[0007] Further, the distance-adjusting mechanism includes a distance-adjusting electric cylinder, a slider, and an idler roller. The distance-adjusting electric cylinder is fixedly connected to the base, a chute for cooperating with the slider is provided on the base, the telescopic end of the distance-adjusting electric cylinder is fixedly connected to the slider, and the idler roller is rotatably connected to the slider.

[0008] Further, a plurality of symmetrically distributed lifting rings are provided on the top surface of the upper plate.

[0009] Further, protective nets are provided on both sides and at the back of the frame, and an openable protective door is provided on the front of the frame.

[0010] Furthermore, an indicating rod is fixedly connected to the telescopic end of the lifting hydraulic cylinder, and scales are provided on both ends of the frame corresponding to the indicating rod.

[0011] Furthermore, a stud is provided at the bottom of the connecting member, and a threaded hole for mating with the stud is provided on the pressing head.

[0012] Furthermore, a plurality of circular holes distributed in an array are provided on the pressing head, and a U-shaped groove is provided on the bottom surface of the pressing head.

[0013] Compared with the prior art, the advantages of the present utility model are as follows: The connecting member is installed on the pressing head, and then the assembled pressing head and the connecting member are directly fixed to the telescopic end of the lifting hydraulic cylinder through a pin, without rotating the pressing head to be threadedly connected with the telescopic end of the lifting hydraulic cylinder, saving labor consumption and improving work efficiency. The circumferential direction of the pressing head is fixed by the polygonal convex block, and the pressing head is quickly fixed in the vertical direction on the telescopic end of the lifting hydraulic cylinder by using a pin. The frustum facilitates the quick alignment of the connecting member with the groove, further improving the assembly efficiency of the pressing head. The detachable connecting member is convenient for cooperating with multiple pressing heads, realizing a single connecting member to cooperate with multiple pressing heads. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0015] Figure 1 It is a schematic diagram of the whole of the present utility model;

[0016] Figure 2 It is a side view of the whole of the present utility model;

[0017] Figure 3 It is an assembly schematic diagram of the machine table and the frame of the present utility model;

[0018] Figure 4 It is an exploded view of the pressing head assembly of the present utility model.

[0019] Among them: 1. Machine platform; 2. Frame; 3. Lifting hydraulic cylinder; 4. Spacing adjustment mechanism; 5. Pressure head assembly; 11. Emergency stop button; 12. Hydraulic pressure gauge; 13. Display screen; 21. Base; 22. Top plate; 23. Column; 24. Safety net; 25. Safety door; 221. Hoisting ring; 31. Plug pin; 32. Indicator rod; 33. Scale; 41. Spacing adjustment electric cylinder; 42. Slide block; 43. Idler roller; 44. Slide groove; 51. Connecting piece; 52. Pressure head; 511. Polygonal convex block; 512. Stud; 513. Anti-slip pattern; 514. Through hole; 521. Round hole; 522. U-shaped groove; 523. Threaded hole. Specific embodiments

[0020] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be described clearly and completely below. 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 scope protected by the present utility model.

[0021] The specific embodiments of the present utility model will be described below in conjunction with the accompanying drawings:

[0022] As Figures 1 to 4 shown, a steel bar and steel pipe bending testing machine includes a machine platform 1 and a frame 2, and the frame 2 is provided above the machine platform 1. A lifting hydraulic cylinder 3 is provided at the top of the frame 2, and a pressure head 52 assembly 5 is provided inside the frame 2. The lifting hydraulic cylinder 3 drives the pressure head assembly 5 to apply an external force to the test sample, causing the test sample to bend and deform.

[0023] The indenter assembly 5 includes a connecting member 51 and an indenter 52. A polygonal protrusion 511 is provided at the top of the connecting member 51, and a groove for mating with the polygonal protrusion 511 is provided at the telescopic end of the lifting hydraulic cylinder 3. The freedom of the connecting member 51 in the circumferential direction is restricted by the cooperation of the polygonal protrusion 511 and the groove. A pin 31 is provided at the telescopic end of the lifting hydraulic cylinder 3, and a through hole 514 for mating with the pin 31 is provided on the polygonal protrusion 511. When the pin 31 passes through the telescopic end of the lifting hydraulic cylinder 3, it also passes through the polygonal protrusion 511, thereby restricting the freedom of the connecting member 51 in the vertical direction. The top of the polygonal protrusion 511 is a frustum of a pyramid, with a narrow top and a wide bottom, which is convenient for quickly and accurately inserting the connecting member 51 into the groove. A stud 512 is provided at the bottom of the connecting member 51, and a threaded hole 523 for mating with the stud 512 is provided on the indenter 52. By directly operating the connecting member 51 to screw into the threaded hole 523 of the indenter 52, there is no need to rotate the indenter 52 to be threadedly connected to the telescopic end of the lifting hydraulic cylinder 3, saving manpower and improving work efficiency. Anti-slip threads 513 are provided on the side surface of the connecting member 51 in the circumferential direction, which is convenient for the user to operate the connecting member 51 to rotate. A plurality of circular holes 521 are provided on the indenter 52 in an array distribution, and the circular holes 521 can improve the anti-compression deformation ability of the indenter 52. A U-shaped groove 522 is provided on the bottom surface of the indenter 52. During the bending test, the test sample is placed in the U-shaped groove 522 to prevent the test sample from moving radially and ensure the smooth progress of the test process.

[0024] An operation panel is provided on the machine table 1, and an emergency stop button 11, a hydraulic pressure gauge 12 and a display screen 13 are provided on the operation panel. When a sudden accident occurs, the emergency stop button 11 can be pressed. The hydraulic pressure gauge 12 can display the applied pressure in real time. The display screen 13 can display data such as the descending speed and displacement of the indenter 52.

[0025] The frame 2 includes a base 21 and an upper plate. A plurality of evenly distributed columns 23 are provided between the base 21 and the upper plate. A plurality of symmetrically distributed lifting rings 221 are provided on the top surface of the upper plate. It is convenient to carry the whole equipment through the lifting rings 221. Protective nets 24 are provided on both sides and the back of the frame 2, and an openable protective door 25 is provided on the front of the frame 2. Through the protective nets 24 and the protective door 25, it is possible to prevent debris from flying out during the test process and cause potential safety hazards. A fixedly connected indicating rod 32 is provided at the telescopic end of the lifting hydraulic cylinder 3, and scales 33 are provided at both ends of the frame 2 corresponding to the indicating rod 32. The indicating rod 32 moves along with the telescopic end of the lifting hydraulic cylinder 3, and the distance of the telescopic end of the lifting hydraulic cylinder 3 moving can be displayed in real time through the scales 33.

[0026] Adjusting mechanisms 4 are provided on both sides of the base 21, and a lifting hydraulic cylinder 3 is provided on the upper plate. The adjusting mechanism 4 includes an adjusting electric cylinder 41, a slider 42, and a roller 43. The adjusting electric cylinder 41 is fixedly connected to the base 21. The base 21 is provided with a chute 44 for mating with the slider 42. The telescopic end of the adjusting electric cylinder 41 is fixedly connected to the slider 42, and the roller 43 is rotatably connected to the slider 42. The adjusting electric cylinder 41 drives the slider 42 to move along the chute 44, and the slider 42 drives the roller 43 to move, thereby changing the spacing between the rollers 43.

[0027] The working principle of the specific embodiment of the present utility model is as follows: Screw the connecting member 51 onto the punch 52 required for bending, and move the assembled connecting member 51 and the punch 52 to directly below the lifting hydraulic cylinder 3. The telescopic end of the lifting hydraulic cylinder 3 moves downward, and the polygonal convex block 511 is inserted into the groove. Insert the pin 31 through the through hole 514 to fixedly connect the connecting member 51 and the telescopic end of the lifting hydraulic cylinder 3. The lifting hydraulic cylinder 3 drives the punch 52 to move upward. The adjusting electric cylinder 41 drives the rollers 43 to an appropriate spacing. Place both ends of the test sample on the rollers 43, close the protective door 25, and the lifting hydraulic cylinder 3 drives the punch 52 to apply pressure to the test sample.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "upper", "lower", "left", "right", "front", "rear" and similar expressions used herein are only for the purpose of illustration.

[0029] The above is only a preferred embodiment of the present invention and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to obtain equivalent embodiments with equivalent changes. However, as long as the technical content of the present invention is not departed from, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A steel bar and steel pipe bending testing machine, comprising a machine table (1) and a frame (2), wherein the frame (2) is provided above the machine table (1), and is characterized in that: A lifting hydraulic cylinder (3) is provided at the top of the frame (2). A press head assembly (5) is provided inside the frame (2). The press head assembly (5) includes a connecting member (51) and a press head (52). A polygonal convex block (511) is provided at the top of the connecting member (51). The top of the polygonal convex block (511) is a frustum. A groove for mating with the polygonal convex block (511) is provided at the telescopic end of the lifting hydraulic cylinder (3). A pin (31) is provided at the telescopic end of the lifting hydraulic cylinder (3), and the pin (31) passes through the polygonal convex block (511). The press head (52) is detachably connected to the connecting member (51).

2. The steel bar and steel pipe bending testing machine according to claim 1, wherein: An operation panel is provided on the machine table (1). An emergency stop button (11), a hydraulic pressure gauge (12), and a display screen (13) are provided on the operation panel.

3. The steel bar and steel pipe bending testing machine according to claim 2, wherein: The frame (2) includes a base (21) and an upper plate. A plurality of uniformly distributed columns (23) are provided between the base (21) and the upper plate. Distance adjustment mechanisms (4) are provided on both sides of the base (21), and the lifting hydraulic cylinder (3) is provided on the upper plate.

4. The steel bar and steel pipe bending testing machine according to claim 3, wherein: The distance adjustment mechanism (4) includes a distance adjustment electric cylinder (41), a slider (42), and a roller (43). The distance adjustment electric cylinder (41) is fixedly connected to the base (21). A chute (44) for mating with the slider (42) is provided on the base (21). The telescopic end of the distance adjustment electric cylinder (41) is fixedly connected to the slider (42), and the roller (43) is rotatably connected to the slider (42).

5. The steel bar and steel pipe bending testing machine according to claim 3, wherein: A plurality of symmetrically distributed lifting rings (221) are provided on the top surface of the upper plate.

6. The steel bar and steel pipe bending testing machine according to claim 3, characterized in that: Safety nets (24) are provided on both sides and at the back of the frame (2), and an openable safety door (25) is provided on the front of the frame (2).

7. The steel bar and steel pipe bending testing machine according to claim 1, wherein: An indicator rod (32) is fixedly connected to the telescopic end of the lifting hydraulic cylinder (3). Scale marks (33) are provided at both ends of the frame (2 corresponding to the indicator rod (32).

8. The steel bar and steel pipe bending testing machine according to claim 1, characterized in that: A stud (512) is provided at the bottom of the connecting member (51), and a threaded hole (523) for mating with the stud (512) is provided on the press head (52).

9. The steel bar and steel pipe bending testing machine according to claim 1, wherein: A plurality of circular holes (521) are provided on the press head (52) in an array distribution, and a U-shaped groove (522) is provided on the bottom surface of the press head (52).

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