A gripper for tensile force testing of titanium alloy bars

Abstract

The present invention belongs to the technical field of solid material strength testing, and discloses a holder for tensile force testing of titanium alloy bars, including a clamping mechanism and a bar. The clamping mechanism specifically includes a fixed frame, a rotating frame threadedly connected to the fixed frame, and a pressing plate rotatably connected to the bottom of the rotating frame. It further includes a positioning mechanism disposed at one end of the fixed frame; a self-locking mechanism disposed at the lower end of the fixed frame and used for self-locking the bar; a first buffer mechanism disposed inside the positioning mechanism and extending to the outside of the positioning mechanism. When the bar is pulled in the present invention, under the action of the pulling force, the positioning box moves away from the fixed frame, and drives the positioning gear to rotate through the movable toothed plate. The positioning gear drives the fitting assembly to rotate upward to further apply pressure to the bar, thereby achieving the effect of self-locking.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid material strength testing, and specifically relates to a gripper for tensile force testing of titanium alloy bars. Background Art

[0002] There are generally two testing situations for the tensile testing of titanium alloy bars. One is the standard tensile test (requiring breaking), which is applicable to material research and development, quality acceptance, and performance comparison. The other is the non-destructive test (not breaking), which is for evaluating the service performance of workpieces (such as titanium alloy blades of aeroengines), detecting residual stress, and monitoring the performance of welded joints. During the standard tensile test, when the bar breaks instantaneously, its own stress will be transmitted to the fixture. Since the material strength of the aluminum alloy bar is relatively high, the stress generated during breaking is also relatively high, and this stress will cause a large impact on the fixture, affecting the service life of the fixture. Therefore, improvements are made to address the above problems. Summary of the Invention

[0003] To solve the problems raised in the above background art, the present invention provides a gripper for tensile force testing of titanium alloy bars.

[0004] To achieve the above object, the present invention provides the following technical solution: A gripper for tensile force testing of titanium alloy bars, including a clamping mechanism and a bar. The clamping mechanism specifically includes a fixed frame, a rotating frame threadedly connected to the fixed frame, and a pressing plate rotatably connected to the bottom of the rotating frame. It also includes,

[0005] A positioning mechanism, which is arranged at one end of the fixed frame;

[0006] A self-locking mechanism, which is arranged at the lower end of the fixed frame and is used for self-locking the bar;

[0007] A first buffer mechanism, which is arranged inside the positioning mechanism and extends to the outside of the positioning mechanism;

[0008] A second buffer mechanism, which is arranged at one end of the positioning mechanism and extends into the fixed frame. The second buffer mechanism and the first buffer mechanism cooperate to buffer the stress of the bar.

[0009] Preferably, the positioning mechanism includes a positioning box. The top of the positioning box is provided with a closed cover. A water storage chamber is opened inside the positioning box. The positioning box is slidably connected to the fixed frame.

[0010] Preferably, a through groove is opened inside the fixed frame. The bar is located in the groove. The groove is divided into a first chamber, a second chamber, and a third chamber from top to bottom, and the three are communicated.

[0011] Preferably, the self-locking mechanism includes a fitting component, a positioning gear, and a movable toothed plate. The fitting component is rotatably connected inside the third bin. The fitting component is fixedly connected to the positioning gear through a connecting shaft. The positioning gear is rotatably connected inside the fixing frame through this connecting shaft. The movable toothed plate meshes with the positioning gear. The positioning gear is fixedly installed on one side of the positioning box and is slidably connected to the fixing frame. The fitting component is inclined.

[0012] Preferably, the fitting component includes a positioning frame, a movable column, and a pressing plate. The positioning frame is fixedly connected to the connecting shaft. The movable column is slidably connected to one end of the positioning frame. The pressing plate is ball-joint connected to the end of the movable column outside the positioning frame. A cavity is provided inside the positioning frame and the cavity is filled with hydraulic oil.

[0013] Preferably, the first buffer mechanism includes a movable rod, a rubber gasket, and a movable plate. The movable rod is piston-connected to the positioning box. The rubber gasket and the movable plate are respectively installed at both ends of the movable rod. The movable plate is located inside the water storage bin and is piston-connected to the water storage bin. Water is filled at the end of the movable plate inside the water storage bin away from the movable rod.

[0014] Preferably, the second buffer mechanism includes a high-pressure connecting pipe, a connecting branch pipe, a connecting bin, and a drain pipe. One end of the high-pressure connecting pipe communicates with the water storage bin and the other end extends inside the fixing frame. The high-pressure connecting pipe communicates with the connecting branch pipe. The connecting bin communicates with the connecting branch pipe. The drain pipe is installed on the top of the connecting bin.

[0015] Preferably, there are three drain pipes on the top of one connecting bin and they are equally spaced. The orientations of the three drain pipes are different. The drain pipes are fixedly installed on the side wall of the third bin.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. When the present invention pulls the bar, under the action of the pulling force, the positioning box moves away from the fixing frame, and drives the positioning gear to rotate through the movable toothed plate. The positioning gear drives the fitting component to rotate upward to further apply pressure to the bar, thereby achieving the effect of self-locking.

[0018] 2. In the present invention, when the movable column contacts the bar, it makes an adaptive adjustment under the action of pressure and fits the bar more closely. The movable column in the middle area first contacts the bar and moves inside the positioning frame under the action of pressure, while the movable columns on both sides move outside the positioning frame, thereby also fitting the bottom of the bar, ensuring a larger contact surface and improving the fixing effect.

[0019] 3. In the present invention, when the bar is broken, under its reaction force, the bar drives the entire clamping mechanism to move towards the positioning mechanism. The positioning gear rotates in the reverse direction to reduce the extrusion force of the pressing plate on the bar. The movement of the bar can drive the movable rod and the movable plate to move, and the water inside the water storage chamber is sprayed obliquely onto the bar through the second buffer mechanism. On the one hand, it is to form a water film between the bar and the clamping mechanism to reduce the friction between the bar and the clamping mechanism, so that after the distance between the fixing frame and the positioning box remains unchanged, the bar can continue to move towards the positioning box. On the other hand, it can cool the metal to prevent metal fatigue caused by friction. And on the other hand, the water flow in the opposite direction to the movement direction of the bar has a certain speed reduction effect. At this time, as the fixing frame moves towards the positioning box, after the pressing plate rotates in the reverse direction and contacts and presses the bar, the movement speed of the bar is reduced through friction, and finally the buffer of the reaction force is realized. Brief Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of the present invention;

[0021] Figure 2 is a detailed structural diagram of the clamping mechanism of the present invention;

[0022] Figure 3 is a sectional view of the structures of the positioning box and the fixing frame of the present invention;

[0023] Figure 4 is another sectional view of the fixing frame of the present invention;

[0024] Figure 5 is a detailed structural diagram of the self-locking mechanism of the present invention;

[0025] Figure 6 For the present invention Figure 5 sectional view of the structure of A therein;

[0026] Figure 7 is a detailed structural diagram of the fitting assembly of the present invention;

[0027] Figure 8 is a schematic diagram of the movement direction of the fitting assembly during stretching of the present invention.

[0028] In the figure: 1. Positioning mechanism; 101. Positioning box; 102. Sealing cover; 103. Water storage bin; 104. Guide roller; 2. Clamping mechanism; 201. Fixed frame; 202. Rotary frame; 203. Pressing plate; 21. First bin; 22. Second bin; 23. Third bin; 3. Self-locking mechanism; 301. Fitting component; 3011. Positioning frame; 3012. Movable column; 3013. Pressing plate; 302. Positioning gear; 303. Movable toothed plate; 4. First buffer mechanism; 401. Movable rod; 402. Rubber gasket; 403. Movable plate; 5. Second buffer mechanism; 501. High-pressure connecting pipe; 502. Connecting branch pipe; 503. Connecting bin; 504. Drain pipe; 6. Bar material. Detailed implementation mode

[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 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] As Figures 1 to 8 shown, the present invention provides a gripper for testing the tensile force of titanium alloy bar materials, including a clamping mechanism 2 and a bar material 6. The clamping mechanism 2 specifically includes a fixed frame 201, a rotary frame 202 threadedly connected to the fixed frame 201, and a pressing plate 203 rotatably connected to the bottom of the rotary frame 202. It also includes,

[0031] a positioning mechanism 1, and the positioning mechanism 1 is arranged at one end of the fixed frame 201;

[0032] a self-locking mechanism 3, and the self-locking mechanism 3 is arranged at the lower end of the fixed frame 201 and is used for self-locking the bar material 6;

[0033] a first buffer mechanism 4, and the first buffer mechanism 4 is arranged inside the positioning mechanism 1 and extends to the outside of the positioning mechanism 1;

[0034] a second buffer mechanism 5, and the second buffer mechanism 5 is arranged at one end of the positioning mechanism 1 and extends into the fixed frame 201. The second buffer mechanism 5 and the first buffer mechanism 4 cooperate to buffer the stress of the bar material 6.

[0035] Adopting the above - mentioned solution: The device is arranged at both ends of the bar 6. One positioning box 101 is fixed on the detection platform, and the other positioning box 101 is connected to the hydraulic cylinder for stretching the bar 6. The bar 6 is clamped and fixed by the cooperation of the fixing frame 201, the rotating frame 202 and the pressing plate 203. The bar 6 is attached to the two side walls of the second bin body 22, and the pressing plate 203 above the bar 6 moves downward to apply pressure to the bar 6. The self - locking mechanism 3 inside the third bin body 23 is inclined and attached to the bottom of the bar 6. When stretching the bar 6, the hydraulic cylinder drives the corresponding positioning box 101 to move. Under the action of the pulling force, the positioning box 101 moves away from the fixing frame 201, and drives the positioning gear 302 to rotate through the movable tooth plate 303. The positioning gear 302 drives the fitting component 301 to rotate upward to further apply pressure to the bar 6, thus achieving the effect of self - locking.

[0036] As Figure 3 shown, the positioning mechanism 1 includes a positioning box 101. A closed cover 102 is installed on the top of the positioning box 101. A water storage bin 103 is opened inside the positioning box 101. The positioning box 101 is slidably connected to the fixing frame 201 through 104.

[0037] Adopting the above - mentioned solution: The closed cover 102 can be used to inject water into the water storage bin 103 and can seal the water storage bin 103. 104 can guide the movement of the positioning box 101 to ensure stability during movement.

[0038] As Figure 1 and Figure 2 shown, a through groove is opened inside the fixing frame 201. The bar 6 is located in the groove. The groove is divided into a first bin body 21, a second bin body 22 and a third bin body 23 from top to bottom, and the three are connected.

[0039] Adopting the above - mentioned solution: The first bin body 21, the second bin body 22 and the third bin body 23 cooperate. The bar 6 is placed inside the three, which can adapt to bars 6 of different sizes and has a wide range of applications.

[0040] As Figures 3 to 5 shown, the self - locking mechanism 3 includes a fitting component 301, a positioning gear 302 and a movable tooth plate 303. The fitting component 301 is rotatably connected inside the third bin body 23. The fitting component 301 is fixedly connected to the positioning gear 302 through a connecting shaft. The positioning gear 302 is rotatably connected inside the fixing frame 201 through this connecting shaft. The movable tooth plate 303 meshes with the positioning gear 302. The positioning gear 302 is fixedly installed on one side of the positioning box 101 and is slidably connected to the fixing frame 201. The fitting component 301 is inclined.

[0041] Adopting the above solution: When the movable tooth plate 303 is pulled in the positioning box 101, it moves synchronously. Since the clamping mechanism 2 clamps the bar 6, the fitting component 301 and the positioning gear 302 installed inside the third bin 23 are stationary inside the fixed frame 201. The movement of the movable tooth plate 303 can drive the positioning gear 302 to rotate, thereby driving the fitting component 301 to flip upward, and further applying a greater extrusion force to the bar 6 to ensure the fixing effect of the bar 6 in the experiment.

[0042] As Figure 7 shown, the fitting component 301 includes a positioning frame 3011, a movable column 3012, and a pressing plate 3013. The positioning frame 3011 is fixedly connected to the connecting shaft. The movable column 3012 is slidably connected to one end of the positioning frame 3011. The pressing plate 3013 is ball-jointed to the end of the movable column 3012 located outside the positioning frame 3011. A cavity is provided inside the positioning frame 3011 and the cavity is filled with hydraulic oil.

[0043] Adopting the above solution: The pressing plate 3013 is ball-jointed to the movable column 3012, so that the movable column 3012 can be adaptively adjusted under pressure when it contacts the bar 6, and it fits the bar 6 better. Since the bar 6 is cylindrical and the movable column 3012 slides inside the positioning frame 3011, when the self-locking mechanism 3 flips upward as a whole, the movable column 3012 in the middle area first contacts the bar 6 and moves inward into the positioning frame 3011 under pressure, while the movable columns 3012 on both sides move outward of the positioning frame 3011, thus also fitting the bottom of the bar 6, ensuring a larger contact surface and improving the fixing effect; the shapes of the pressing plate 3013 and the pressing plate 203 can be adaptively adjusted.

[0044] As Figure 3 shown, the first buffer mechanism 4 includes a movable rod 401, a rubber gasket 402, and a movable plate 403. The movable rod 401 is piston-connected to the positioning box 101. The rubber gasket 402 and the movable plate 403 are respectively installed at both ends of the movable rod 401. The movable plate 403 is located inside the water storage bin 103 and is piston-connected to the water storage bin 103. Water is filled at the end of the movable plate 403 inside the water storage bin 103 away from the movable rod 401.

[0045] Adopting the above solution: When the bar 6 is broken, under its reaction force, the bar 6 drives the clamping mechanism 2 as a whole to move towards the positioning mechanism 1. At this time, the positioning gear 302 rotates in the reverse direction under the action of the movable tooth plate 303, and the pressing force of the pressing plate 3013 on the bar 6 decreases. Under the action of inertia, the bar 6 contacts and presses the rubber gasket 402 to deform it, driving the movable rod 401 and the movable plate 403 to move into the positioning box 101, thereby spraying the water inside the water storage bin 103 obliquely onto the bar 6 through the second buffer mechanism 5. On the one hand, in order to form a water film between the bar 6 and the clamping mechanism 2 to reduce the friction between the bar 6 and the clamping mechanism 2, so that after the distance between the fixing frame 201 and the positioning box 101 remains unchanged, the bar 6 can continue to move towards the positioning box 101. On the other hand, it can cool down the metal to prevent metal fatigue caused by friction. And on the other hand, the water flow in the direction opposite to the movement direction of the bar 6 has a certain speed reduction effect. At this time, as the fixing frame 201 moves towards the positioning box 101, the pressing plate 3013 rotates in the reverse direction and contacts and presses the bar 6, reducing the moving speed of the bar 6 through friction, and finally realizing the buffering of the reaction force.

[0046] As Figure 5 and Figure 6 shown, the second buffer mechanism 5 includes a high-pressure connecting pipe 501, a connecting branch pipe 502, a connecting bin 503 and a drain pipe 504. One end of the high-pressure connecting pipe 501 communicates with the water storage bin 103, and the other end extends into the fixing frame 201. The high-pressure connecting pipe 501 communicates with the connecting branch pipe 502, the connecting bin 503 communicates with the connecting branch pipe 502, the drain pipe 504 is installed on the top of the connecting bin 503. There are three drain pipes 504 on the top of one connecting bin 503 and they are equally spaced. The orientations of the three drain pipes 504 are different, and the drain pipes 504 are fixedly installed on the side wall of the third bin body 23.

[0047] Adopting the above solution: The directions of the three drain pipes 504 are all different, which can evenly spray the water flow between the bar 6 and the fixing frame 201, ensuring the reduction of friction and enabling the bar 6 to slide inside the fixing frame 201.

[0048] The working principle and usage process of the present invention:

[0049] During use, first place both ends of the bar 6 inside the two fixing frames 201 on both sides, and rotate the rotating frame 202 to move it downward to fix the bar 6 under pressure through the pressing plate 203. At this time, the bar 6 is attached to the two side walls of the second bin body 22. The pressing plate 203 above the bar 6 moves downward to apply pressure to the bar 6. Start the hydraulic cylinder connected to one side of one of the positioning boxes 101, drive the positioning box 101 fixed on it to move and pull the bar 6.

[0050] During the pulling process, the positioning box 101 moves away from the fixing frame 201, and drives the positioning gear 302 to rotate through the movable tooth plate 303. The positioning gear 302 drives the fitting assembly 301 to rotate upward to further apply pressure to the bar 6. When the movable column 3012 contacts the bar 6, it makes an adaptive adjustment under the pressure and fits the bar 6 more closely. The movable column 3012 in the middle area first contacts the bar 6 and moves into the positioning frame 3011 under the pressure, while the movable columns 3012 on both sides move outward from the positioning frame 3011, thus also fitting the bottom of the bar 6, ensuring a larger contact surface, improving the fixing effect, and achieving the effect of self-locking to ensure the fixing effect of the bar 6 in the experiment.

[0051] After the bar 6 is broken, under its reaction force, the bar 6 drives the clamping mechanism 2 as a whole to move towards the positioning mechanism 1. At this time, the positioning gear 302 rotates in the reverse direction under the action of the movable tooth plate 303, and the extrusion force of the pressure plate 3013 on the bar 6 decreases. Under the inertia, the bar 6 contacts the rubber gasket 402 and squeezes it to deform, driving the movable rod 401 and the movable plate 403 to move into the positioning box 101, so as to spray the water in the water storage bin 103 obliquely onto the bar 6 through the second buffer mechanism 5. On the one hand, it is to form a water film between the bar 6 and the clamping mechanism 2 to reduce the friction between the bar 6 and the clamping mechanism 2, so that after the distance between the fixing frame 201 and the positioning box 101 remains unchanged, the bar 6 can continue to move towards the positioning box 101. On the other hand, it can cool the metal to prevent metal fatigue caused by friction. And on the other hand, it can play a certain speed reduction effect through the water flow in the opposite direction to the moving direction of the bar 6. At this time, as the fixing frame 201 moves towards the positioning box 101, the pressure plate 3013 rotates in the reverse direction and contacts and squeezes the bar 6, reducing the moving speed of the bar 6 through friction, and finally achieving the buffering of the reaction force.

[0052] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0053] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A clamp for testing the tensile force of a titanium alloy bar, comprising a clamping mechanism (2) and a bar (6), wherein the clamping mechanism (2) specifically comprises a fixed frame (201), a rotating frame (202) threadedly connected to the fixed frame (201), and a pressing plate (203) rotatably connected to the bottom of the rotating frame (202), characterized in that: Also includes, A positioning mechanism (1), wherein the positioning mechanism (1) is arranged at one end of the fixing frame (201); A self-locking mechanism (3), the self-locking mechanism (3) being arranged at the lower end of the fixing frame (201) and being used for self-locking the rod (6); A first buffer mechanism (4), the first buffer mechanism (4) being arranged inside the positioning mechanism (1) and extending to the outside of the positioning mechanism (1); a second buffer mechanism (5), the second buffer mechanism (5) being arranged at one end of the positioning mechanism (1) and extending into the interior of the fixing frame (201), the second buffer mechanism (5) and the first buffer mechanism (4) cooperating to achieve buffering of the stress of the rod (6); The self-locking mechanism (3) comprises a fitting component (301), a positioning gear (302) and a movable tooth plate (303); the fitting component (301) comprises a positioning frame (3011), a movable column (3012) and a pressure plate (3013); the positioning frame (3011) is fixedly connected to a connecting shaft; the movable column (3012) is slidably connected to one end of the positioning frame (3011); the pressure plate (3013) is ball-axled to one end of the movable column (3012) located outside the positioning frame (3011); a cavity is provided inside the positioning frame (3011) and is filled with hydraulic oil; The positioning mechanism (1) comprises a positioning box (101), a water storage bin (103) is provided inside the positioning box (101), and the second buffer mechanism (5) comprises a high-pressure connecting pipe (501), a connecting branch pipe (502), a connecting bin (503) and a drainage pipe (504), one end of the high-pressure connecting pipe (501) is connected to the water storage bin (103), and the other end extends to the inside of the fixing frame (201), the high-pressure connecting pipe (501) is connected to the connecting branch pipe (502), and the connecting bin (503) is connected to the connecting branch pipe (502), and the drainage pipe (504) is installed on the top of the connecting bin (503), and there are three drainage pipes (504) on the top of one connecting bin (503) and they are equidistantly distributed, the three drainage pipes (504) have different directions, and the drainage pipe (504) is fixedly installed on the side wall of the third bin body (23).

2. The titanium alloy bar tensile force test holder according to claim 1, characterized in that: A closing cover (102) is installed on the top of the positioning box (101), and the positioning box (101) is slidably connected to the fixing frame (201) via (104).

3. The titanium alloy bar tensile force test holder according to claim 1, characterized in that: A through slot is provided inside the fixing frame (201), the rod (6) is located inside the slot, and the slots are respectively a first bin (21), a second bin (22) and a third bin (23) from top to bottom, and the three are connected.

4. The titanium alloy bar tensile force test holder according to claim 1, characterized in that: The laminating component (301) is rotatably connected to the inside of the third warehouse body (23); the laminating component (301) is fixedly connected to the positioning gear (302) via a connecting shaft; the positioning gear (302) is rotatably connected to the inside of the fixing frame (201) via the connecting shaft; the movable tooth plate (303) is meshed with the positioning gear (302); the positioning gear (302) is fixedly installed on one side of the positioning box (101) and is slidably connected to the fixing frame (201); and the laminating component (301) is inclined.

5. The titanium alloy bar tensile force test holder according to claim 2, characterized in that: The first buffer mechanism (4) comprises a movable rod (401), a rubber gasket (402) and a movable plate (403); the movable rod (401) is connected to the piston of the positioning box (101); the rubber gasket (402) and the movable plate (403) are respectively mounted at two ends of the movable rod (401); the movable plate (403) is located inside the water storage bin (103) and connected to the piston of the water storage bin (103); and the end of the movable plate (403) inside the water storage bin (103) away from the movable rod (401) is filled with water.

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