Deflection tensile testing machine with liftable mandrel

Abstract

The invention discloses a deflection tensile testing machine with a liftable mandrel, and belongs to the field of performance deflection tensile tests.The tensile testing machine comprises a bottom plate, a lifting structure and angle adjusting structures fixedly installed on the front side and the rear side of the bottom plate are installed on the end face of the bottom plate, the mandrel is installed on the lifting structure, and the angle adjusting structures are fixedly installed on the front side and the rear side of the bottom plate. An anchorage device is mounted on the angle adjusting structure; the lifting structure is arranged, the lead screw rotates forwards or reversely to drive the H-shaped plate to move up and down, and the mandrel is lifted, so that the problems that in the prior art, the mandrel of a deflection tensile testing machine cannot be lifted, an included angle exists between the mandrel and the end of an anchorage device, the threading process is difficult, and the working efficiency is high when a large-specification steel strand is operated in a laboratory are solved. And the problem that the steel strand cannot conveniently penetrate out of the threading anchorage device is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of performance skew tensile test, and specifically to a skew tensile testing machine with a liftable mandrel. Background Art

[0002] With the in-depth mining of the coal mining industry, the mining depth continues to increase and the geological conditions become more and more complex. After the construction of the anchor cable composed of steel strands is completed, the stress state of the steel strands in the rock formation is often not vertical. The tensile force of the steel strands is not in a horizontal state but in an angled skew tensile state. In order to simulate the actual stress situation in reality and examine the skew tensile performance of the steel strands, according to the national standard requirements of the steel strand products, when testing the maximum force reduction coefficient of the prestressed steel strand under a 20° angled skew axial tension. This test can provide test data support for engineering users to evaluate the stress loss of the prestressed steel strand under skew tension.

[0003] In the existing skew tensile testing machine, the mandrel cannot be lifted. When operating on large-sized steel strands in the laboratory, due to the angle between the mandrel and the end of the anchor, the threading process is difficult and it is not convenient for the steel strands to pass through the threading anchor. The inclination angles of the anchors on both sides of the existing skew tensile testing machine are usually fixedly set, and the angles of the anchors cannot be adjusted, resulting in that the testing machine only conducts skew tensile tests on steel strands and the test materials are single.

[0004] Therefore, the present invention provides a skew tensile testing machine with a liftable mandrel to solve the above problems. Summary of the Invention

[0005] The present invention provides a skew tensile testing machine with a liftable mandrel, aiming to solve the problems in the prior art that the mandrel of the existing skew tensile testing machine cannot be lifted, when operating on large-sized steel strands in the laboratory, due to the angle between the mandrel and the end of the anchor, the threading process is difficult and it is not convenient for the steel strands to pass through the threading anchor; the angles of the anchors cannot be adjusted, resulting in that the testing machine only conducts skew tensile tests on steel strands and the test materials are single.

[0006] To achieve the above object, the present invention provides the following technical solution: A skew tensile testing machine with a liftable mandrel, including a bottom plate, on the end face of which a lifting structure is installed and angle adjusting structures fixedly installed on the front and rear sides of the bottom plate, a mandrel is installed on the lifting structure, and an anchor is installed on the angle adjusting structure;

[0007] The lifting structure includes a support frame installed on the end face of the bottom plate and two lead screws rotatably installed on the bottom plate through bearings. A worm gear is installed on the outer wall of the lead screw. A motor is installed on the left side wall of the bottom plate, and a worm is arranged at the driving end of the motor and meshed with the two worm gears. The two lead screws are threadedly installed with an H-shaped plate. By setting the lifting structure, when the lead screw rotates forward or backward, the H-shaped plate is driven to move up and down, realizing the lifting of the core shaft, thus solving the problem that the core shaft of the existing inclined tensile testing machine cannot be lifted. During the laboratory operation of large-specification steel strands, due to the angle between the core shaft and the end of the anchor, the wire threading process is difficult, and it is not convenient for the steel strand to pass through the wire threading anchor, providing convenience for the test operation and improving the test efficiency;

[0008] The angle adjustment structure includes a U-shaped frame installed on the end face of the bottom plate and a first cylinder rotatably installed on the bottom plate. The left and right sides of the U-shaped frame are rotatably installed with rotating shafts through bearings. A rotating plate is installed on the outer wall of the rotating shaft through a connecting piece. A protractor is installed on the left side wall of the U-shaped frame, and a pointer is installed at the left end of the rotating shaft corresponding to the protractor. By setting the angle adjustment structure, the first cylinder drives the rotating plate to rotate, and the rotating shaft drives the pointer to point to the scale line of the protractor, adjusting the inclination angles of the front and rear anchors to the angles required for the steel strand stretching. The inclined tensile test of the steel strand can be carried out, and the angles of the two anchors can be adjusted according to the angles required for the stretching of materials such as steel ropes and steel bars, and the horizontal tensile test of materials such as steel ropes and steel bars can be carried out, thus avoiding the problem that the inclination angles of the two anchors of the existing inclined tensile testing machine are usually fixedly set and the angles of the anchors cannot be adjusted, resulting in the testing machine only carrying out the inclined tensile test on the steel strand.

[0009] Preferably, a replacement structure is installed on the end face of the H-shaped plate;

[0010] The replacement structure includes a mounting plate installed on the end face of the H-shaped plate. Fixed blocks are installed at the corners of the end face of the mounting plate. Springs are installed in the fixed blocks through mounting grooves. A limiting block slidably connected to the mounting groove is installed at the other end of the fixed block. The front and rear fixed blocks are slidably installed with an arc-shaped plate through an opening.

[0011] Preferably, the support frame includes four columns installed on the end face of the bottom plate and a top plate for connecting the four columns. A receiving groove is formed on the bottom plate, and a plate member is installed on the bottom plate through the receiving groove.

[0012] Preferably, the upper end of the lead screw penetrates through the plate member and is rotatably connected to the bottom of the top plate through a bearing. The H-shaped plate is slidably connected to the four columns through connection holes.

[0013] Preferably, one end of the first cylinder is rotatably installed with a fixing bracket connected to the end face of the bottom plate through a connection hole, and the driving end of the first cylinder is rotatably connected to the bottom of the rotating plate through a universal joint.

[0014] Preferably, a T-shaped slider is slidably installed on the front rotating plate through a chute. Support blocks are installed on the end faces of the T-shaped slider and the rear rotating plate. An anchor is installed on the inner wall of the upper side of the support block. Fixing bolts are installed on the front and rear sides of the anchor through threaded holes.

[0015] Preferably, a fixing plate is installed on the end face of the front rotating plate. A second cylinder is installed on the side wall of the fixing plate. The driving end of the second cylinder is installed with a force measuring sensor fixedly connected to the front anchor through a connecting block.

[0016] Preferably, the mounting plate is connected to the core shaft through a connecting groove, and the arc-shaped plate is adapted to the outer wall of the core shaft.

[0017] Preferably, connecting parts are provided on the front and rear sides of the arc-shaped plate. The end face of the limiting block is an inclined surface. A pull rod is installed on the end face of the limiting block. An activity groove for the front and rear movement of the pull rod is opened on the fixed block.

[0018] Beneficial effects:

[0019] 1. By setting the lifting structure, the H-shaped plate is driven to move up and down by rotating the lead screw forward or backward, realizing the lifting of the core shaft, thus solving the problem that the core shaft of the existing skew tensile testing machine cannot be lifted. During the laboratory operation of large-sized steel strands, due to the angle between the core shaft and the end of the anchor, the wire threading process is difficult and it is not convenient for the steel strand to pass through the threading anchor, providing convenience for the test operation and improving the test efficiency;

[0020] 2. By setting the angle adjustment structure, the first cylinder drives the rotating plate to rotate, and the rotating shaft drives the pointer to point to the scale line of the protractor, adjusting the inclination angles of the front and rear anchors to the angles required for the steel strand stretching. The steel strand can be subjected to skew tensile tests. According to the angles required for the stretching of materials such as wire ropes and steel bars, the angles of the two-side anchors can be adjusted to perform horizontal tensile tests on materials such as wire ropes and steel bars, thus avoiding the problem that the inclination angles of the two-side anchors of the existing skew tensile testing machine are usually fixedly set and the angles of the anchors cannot be adjusted, resulting in the testing machine only performing skew tensile tests on steel strands, enabling the device to perform tensile tests on various materials. Description of the drawings

[0021] Figure 1 It is a three-dimensional structural schematic diagram of a skew tensile testing machine with a liftable core shaft;

[0022] Figure 2Schematic diagram of the three-dimensional sectional structure of a skew tensile testing machine with a liftable mandrel;

[0023] Figure 3 Schematic diagram of the split angle adjustment structure of a skew tensile testing machine with a liftable mandrel;

[0024] Figure 4 Schematic diagram of the enlarged structure at position A of a skew tensile testing machine with a liftable mandrel;

[0025] Figure 5 Schematic diagram of the split structure of the anchor of a skew tensile testing machine with a liftable mandrel;

[0026] Figure 6 Schematic diagram of the replacement structure of a skew tensile testing machine with a liftable mandrel;

[0027] Figure 7 Schematic diagram of the partial section of the replacement structure of a skew tensile testing machine with a liftable mandrel.

[0028] In the figure: 1. Base plate; 11. Accommodating groove; 12. Plate member; 2. Lifting structure; 21. Support frame; 211. Column; 212. Top plate; 22. Lead screw; 23. Worm gear; 24. Motor; 25. Worm; 26. H-shaped plate; 3. Mandrel; 4. Angle adjustment structure; 41. U-shaped frame; 42. Rotating shaft; 43. Rotating plate; 431. Sliding groove; 432. T-shaped slider; 44. First cylinder; 441. Fixed frame; 442. Universal joint; 45. Protractor; 46. Pointer; 5. Anchor; 51. Threaded hole; 52. Fixed bolt; 53. Support block; 6. Force measuring sensor; 7. Second cylinder; 71. Fixed plate; 72. Connecting block; 8. Replacement structure; 81. Mounting plate; 82. Fixed block; 821. Mounting groove; 822. Moving groove; 823. Opening; 83. Spring; 84. Limiting block; 841. Pull rod; 85. Arc-shaped plate; 851. Connecting part; 9. Steel strand. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Embodiment 1

[0031] This embodiment provides a skew tensile testing machine with a liftable mandrel, as Figure 1-7As shown in the figure, the tensile testing machine includes a bottom plate 1. An elevating structure 2 is installed on the end face of the bottom plate 1, and angle adjusting structures 4 are fixedly installed on the front and rear sides of the bottom plate 1. A mandrel 3 is installed on the elevating structure 2, and an anchor 5 is installed on the angle adjusting structure 4;

[0032] The elevating structure 2 includes a support frame 21 installed on the end face of the bottom plate 1 and two lead screws 22 rotatably installed on the bottom plate 1 through bearings. A worm gear 23 is installed on the outer wall of the lead screw 22. A motor 24 is installed on the left side wall of the bottom plate 1. A worm 25 meshingly connected with the two worm gears 23 is arranged at the driving end of the motor 24. The two lead screws 22 are threadedly installed with an H-shaped plate 26;

[0033] During use, the motor 24 is used to drive the worm 25 to rotate forward or backward. The worm 25 drives the left and right worm gears 23 to rotate synchronously. The worm gears 23 drive the lead screws 22 to rotate forward or backward. The two lead screws 22 synchronously drive the H-shaped plate 26 to move up or down, so as to realize the lifting of the mandrel 3. When testing the steel strand 9, the mandrel 3 is lowered to a certain position, and the steel strand 9 is passed through the rear inlet anchor 5 and placed above the mandrel 3, and then passed through the outlet anchor 5. At this time, the anchor 5 is in a horizontal state, which is convenient for the large-sized steel strand 9 to pass through. The knob fixing bolt 52 moves downward to fix the steel strand 9 in the anchor 5. The mandrel 3 is raised and the steel anchor 5 is pushed upward to a predetermined position for testing, thus solving the problems in the prior art that the mandrel 3 of the skew tensile testing machine cannot be lifted, and when operating on the large-sized steel strand 9 in the laboratory, due to the angle between the mandrel 3 and the end of the anchor 5, the wire threading process is difficult and it is not convenient for the steel strand 9 to pass through the threading anchor 5, providing convenience for the test operation and improving the test efficiency;

[0034] The angle adjusting structure 4 includes a U-shaped frame 41 installed on the end face of the bottom plate 1 and a first cylinder 44 rotatably installed on the bottom plate 1. The left and right sides of the U-shaped frame 41 are rotatably installed with a rotating shaft 42 through bearings. A rotating plate 43 is installed on the outer wall of the rotating shaft 42 through a connecting member. A protractor 45 is installed on the left side wall of the U-shaped frame 41. A pointer 46 corresponding to the protractor 45 is installed at the left end of the rotating shaft 42.

[0035] During use, the first cylinder 44 works to drive the rotating plate 43 to rotate through the universal joint 442. The rotating plate 43 drives the rotating shaft 42 to rotate in the U-shaped frame 41, and the rotating shaft 42 drives the U-shaped frame 41 to rotate. The rotating shaft 42 drives the pointer 46 to point to the protractor 45. According to the angle required for stretching the steel strand 9, the pointer 46 is pointed to the corresponding angle scale line, so that the inclination angles of the front and rear anchors 5 are adjusted to the angles required for stretching the steel strand 9, and the inclined stretching test of the steel strand 9 can be carried out. Also, according to the angles required for stretching materials such as wire ropes and steel bars, the angles of the two-side anchors 5 can be adjusted, and the horizontal stretching test of materials such as wire ropes and steel bars can be carried out. Thus, it avoids the problem that the inclination angles of the two-side anchors 5 of the existing inclined stretching testing machine are usually fixedly set and the angles of the anchors 5 cannot be adjusted, resulting in the testing machine only carrying out the inclined stretching test on the steel strand 9, enabling the device to carry out stretching tests on various materials and improving the flexibility of use of the testing machine.

[0036] In this embodiment, the support frame 21 includes four columns 211 installed on the end face of the bottom plate 1 and a top plate 212 for connecting the four columns 211. A receiving groove 11 is formed on the bottom plate 1, and a plate member 12 is installed on the bottom plate 1 through the receiving groove 11; the upper end of the lead screw 22 penetrates through the plate member 12 and is rotatably connected to the bottom of the top plate 212 through a bearing, and the H-shaped plate 26 is slidably connected to the four columns 211 through a connection hole;

[0037] Among them, through the setting of the plate member 12, the worm wheel 23 and the worm 25 in the receiving groove 11 can be sealed and protected to prevent dust from entering and adhering to mechanical parts, affecting the transmission between parts and the service life;

[0038] In this embodiment, one end of the first cylinder 44 is rotatably installed through a connection hole with a fixed frame 441 connected to the end face of the bottom plate 1, and the driving end of the first cylinder 44 is rotatably connected to the bottom of the rotating plate 43 through a universal joint 442; the front rotating plate 43 is slidably installed with a T-shaped slider 432 through a chute 431, and support blocks 53 are installed on the end faces of the T-shaped slider 432 and the rear rotating plate 43. An anchor 5 is installed on the upper inner wall of the support block 53, and fixing bolts 52 are installed on the front and rear sides of the anchor 5 through threaded holes 51;

[0039] Among them, through the setting of the T-shaped slider 432, when the T-shaped slider 432 slides in the chute 431 of the rotating plate 43, the up and down positions of the T-shaped slider 432 can be restricted, so that the T-shaped slider 432 stably moves back and forth in the chute 431, driving the front anchor 5 to carry out a stretching test on the steel strand 9;

[0040] In this embodiment, a fixing plate 71 is installed on the end face of the front rotating plate 43, a second cylinder 7 is installed on the side wall of the fixing plate 71, and the driving end of the second cylinder 7 is installed with a force sensor 6 fixedly connected to the front anchor 5 through a connecting block 72;

[0041] Among them, through the force-measuring sensor 6, the result value of the test of the device for stretching the steel strand 9 can be obtained, providing detection data support for engineering users to evaluate the stress loss of the prestressed steel strand 9 under eccentric tension.

[0042] Embodiment 2

[0043] Different from Embodiment 1, the existing tensile testing machine fixes the mandrel 3 through bolts and fixing parts. When the mandrel 3 is severely worn and needs to be replaced, this installation method results in low efficiency in replacing the mandrel 3. Therefore, a replacement structure 8 is installed on the end face of the H-shaped plate 26;

[0044] The replacement structure 8 includes a mounting plate 81 installed on the end face of the H-shaped plate 26. Fixing blocks 82 are installed at the end face corners of the mounting plate 81. Springs 83 are installed on the fixing blocks 82 through mounting grooves 821. Limit blocks 84 slidably connected to the mounting grooves 821 are installed at the other ends of the fixing blocks 82. Arc-shaped plates 85 are slidably installed through openings 823 between the front and rear fixing blocks 82;

[0045] During use, drive the front and rear pull rods 841 to drive the corresponding limit blocks 84 to move away from the mandrel 3. The limit blocks 84 squeeze the springs 83 into the mounting grooves 821, separating the limit blocks 84 from the connecting parts 851. Remove the arc-shaped plate 85 and the mandrel 3, place a new mandrel 3 in the connection of the mandrel 3, and then drive the arc-shaped plate 85, so that the front and rear connecting parts 851 drive the inclined surfaces of the limit blocks 84, causing the limit blocks 84 to enter the mounting grooves 821. The connecting parts 851 move past the limit blocks 84 and move to the lower side of the limit blocks 84. The limit blocks 84 are driven by the reset action of the springs 83 to move to the end faces of the connecting parts 851, realizing the restriction of the arc-shaped plate 85 and achieving the rapid replacement of the mandrel 3. When the mandrel 3 is severely worn and needs to be replaced, the replacement efficiency of the mandrel 3 is improved;

[0046] In this embodiment, the mounting plate 81 is connected to the mandrel 3 through connecting grooves. The arc-shaped plate 85 is adapted to the outer wall of the mandrel 3; connecting parts 851 are provided on both the front and rear sides of the arc-shaped plate 85. The end face of the limit block 84 is an inclined surface. A pull rod 841 is installed on the end face of the limit block 84. An activity groove 822 for the front and rear movement of the pull rod 841 is provided on the fixing block 82;

[0047] Among them, through the adaptation of the arc-shaped plate 85 to the outer wall of the mandrel 3, there will be no gap between the arc-shaped plate 85 and the mandrel 3, thus making the installation of the mandrel 3 more firm.

[0048] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and its concept of the present invention, making equivalent replacements or changes should be covered within the protection scope of the present invention.

Claims

1. A skew tensile testing machine with a liftable mandrel, comprising a bottom plate (1), characterized in that: The end face of the bottom plate (1) is provided with a lifting structure (2) and angle adjusting structures (4) fixedly installed on the front and rear sides of the bottom plate (1). A mandrel (3) is installed on the lifting structure (2), and an anchor (5) is installed on the angle adjusting structure (4); The lifting structure (2) includes a support frame (21) installed on the end face of the bottom plate (1) and two lead screws (22) rotatably installed on the bottom plate (1) through bearings. A worm gear (23) is installed on the outer wall of the lead screw (22). A motor (24) is installed on the left side wall of the bottom plate (1). A worm (25) meshed with the two worm gears (23) is arranged at the driving end of the motor (24). The two lead screws (22) are threadedly installed with an H-shaped plate (26); The angle adjusting structure (4) includes a U-shaped frame (41) installed on the end face of the bottom plate (1) and a first cylinder (44) rotatably installed on the bottom plate (1). Rotating shafts (42) are rotatably installed on the left and right sides of the U-shaped frame (41) through bearings. A rotating plate (43) is installed on the outer wall of the rotating shaft (42) through a connecting member. A protractor (45) is installed on the left side wall of the U-shaped frame (41). A pointer (46) is installed at the left end of the rotating shaft (42) corresponding to the protractor (45).

2. The skewed tensile testing machine with a vertically movable mandrel according to claim 1, wherein: A replacement structure (8) is installed on the end face of the H-shaped plate (26); The replacement structure (8) includes a mounting plate (81) installed on the end face of the H-shaped plate (26). Fixed blocks (82) are installed at the corners of the end face of the mounting plate (81). Springs (83) are installed in the fixed blocks (82) through mounting grooves (821). A limiting block (84) slidably connected to the mounting groove (821) is installed at the other end of the fixed block (82). An arc-shaped plate (85) is slidably installed through openings (823) on the front and rear fixed blocks (82).

3. The tilting tensile testing machine with a vertically movable mandrel according to claim 1, characterized in that: The support frame (21) includes four columns (211) installed on the end face of the bottom plate (1) and a top plate (212) for connecting the four columns (211). A receiving groove (11) is formed on the bottom plate (1). A plate member (12) is installed on the bottom plate (1) through the receiving groove (11).

4. The tilting tensile testing machine with a vertically movable mandrel according to claim 3, wherein: The upper end of the lead screw (22) penetrates through the plate member (12) and is rotatably connected to the bottom of the top plate (212) through a bearing. The H-shaped plate (26) is slidably connected to the four columns (211) through connection holes.

5. The skewed tensile testing machine with a liftable mandrel according to claim 1, wherein: One end of the first cylinder (44) is rotatably installed through a connection hole with a fixed frame (441) connected to the end face of the bottom plate (1). The driving end of the first cylinder (44) is rotatably connected to the bottom of the rotating plate (43) through a universal joint (442).

6. The tilting tensile testing machine with a liftable mandrel according to claim 1, characterized in that: A T-shaped slider (432) is slidably installed on the front rotating plate (43) through a chute (431). Support blocks (53) are installed on the end faces of the T-shaped slider (432) and the rear rotating plate (43). An anchor (5) is installed on the upper inner wall of the support block (53). Fixed bolts (52) are installed on the front and rear sides of the anchor (5) through threaded holes (51).

7. The tilting tensile testing machine with a vertically movable mandrel according to claim 1, wherein: A fixing plate (71) is installed on the end face of the front side turning plate (43). A second cylinder (7) is installed on the side wall of the fixing plate (71). The driving end of the second cylinder (7) is installed with a force measuring sensor (6) fixedly connected to the front side anchor (5) through a connecting block (72).

8. The tilting tensile testing machine with a vertically movable mandrel according to claim 2, characterized in that: The mounting plate (81) is connected to the core shaft (3) through a connecting groove, and the arc-shaped plate (85) is adapted to the outer wall of the core shaft (3).

9. The tilting and stretching testing machine with a vertically movable mandrel according to claim 2, wherein: Connecting parts (851) are arranged on the front and rear sides of the arc-shaped plate (85). The end face of the limiting block (84) is an inclined surface. A pull rod (841) is installed on the end face of the limiting block (84). A movable groove (822) for the forward and backward movement of the pull rod (841) is formed in the fixed block (82).

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