Device for testing yield strength of metal raw material plate

Abstract

The utility model provides a device for testing yield strength of a metal raw material plate, and relates to the technical field of metal raw material plate testing devices, the device comprises a machine base and a hydraulic rod, the machine base is placed on the ground and is used for bearing the whole device, two groups of clamping mechanisms are arranged on the outer surface of the machine base, each clamping mechanism comprises a U-shaped rod, a clamping block and two round rods, the clamping mechanism is arranged, the upper end and the lower end of a metal plate are inserted between the two clamping blocks on the outer surfaces of the two U-shaped rods respectively, the round rods are pushed by the springs to move, so that the clamping blocks on the two sides of the U-shaped rods can move by the same distance, and the metal plate can be clamped through the two round rods. And an electric push rod is operated to control a piston rod to move, so that an expansion piece on one side of the inner wall of a liquid storage tank abuts against the outer surface of a round rod to fix the positions of the clamping blocks, the stress on the left side and the right side is the same when the plate is clamped between the two clamping blocks, and the plate is prevented from loosening or sliding when being pulled as much as possible.

Description

Technical Field

[0001] This utility model relates to the technical field of metal raw material plate testing devices, and in particular to a metal raw material plate yield strength testing device. Background Technology

[0002] Yield strength is the yield limit of a metallic material when it undergoes yielding, that is, the stress that resists a small amount of plastic deformation. For metallic materials that do not exhibit obvious yielding, the stress value that produces 0.2% residual deformation is defined as its yield limit, called the conditional yield limit or yield strength. Currently, all manufactured metallic materials need to be tested for plastic yield strength to determine whether the metallic material meets the design requirements.

[0003] When testing the yield strength of metal raw material plates, a universal testing machine is usually used. The metal raw material plate is clamped in the fixture of the universal testing machine, and axial tensile force is applied by the testing machine. The tensile force and the force value when the metal material yields are obtained by the sensor, and the yield strength is calculated. However, since the metal plate is fixed by the gripper, when the plate is placed on the gripper, the control of the upper and lower grippers may be deviated when the plate is clamped by rotating the control lever on one side of the two grippers. This will result in different pressures applied to the upper and lower ends of the metal plate by the two grippers. At the same time, during the application of force, some plates with relatively smooth surfaces are prone to slight slippage and loosening, which will affect the accuracy of the test results and lead to the problem of low stability when the testing device is used. Utility Model Content

[0004] The purpose of this invention is to solve the problem that when metal plates are fixed by grippers, and the plate is placed on the grippers, the control lever on one side of the two grippers may be rotated to clamp the plate, which may cause deviations in the adjustment of the upper and lower grippers. This results in different pressures applied to the upper and lower ends of the metal plate by the two grippers. At the same time, during the application of force, some plates with relatively smooth surfaces are prone to slight slippage and loosening, which affects the accuracy of the test results and leads to low stability of the testing device. Therefore, this invention proposes a metal raw material plate yield strength testing device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a metal raw material plate yield strength testing device, comprising a base and a hydraulic rod. The base is placed on the ground to support the entire device. A support rod is provided at the top of the base, and a sliding rod is slidably connected to the outer surface of the support rod. The hydraulic rod is installed on the outside of the base to control the sliding rod to slide on the outer surface of the support rod. A tension sensor is provided at the bottom end of the sliding rod. Two sets of clamping mechanisms are provided on the outer surface of the base. The two sets of clamping mechanisms are respectively installed on the bottom end of the tension sensor and one side of the top of the base by bolts.

[0006] Preferably, the clamping mechanism includes a U-shaped rod, a clamping block, and two round rods. The U-shaped rod is bolted to the bottom of the tension sensor or to one side of the top of the base. The two round rods slide on the inner wall of the U-shaped rod to connect to the clamping block. A spring is provided on one side of the clamping block to restrict the position of the round rods on the outer surface of the U-shaped rod. A grooved cylinder is fixedly connected to both sides of the U-shaped rod. A liquid storage tank is opened inside the grooved cylinder, and hydraulic oil is provided inside the liquid storage tank. An expansion plate is fixedly connected to one side of the inner wall of the liquid storage tank. A cylinder is fixedly connected to the top of the grooved cylinder. A piston rod is slidably connected to the inner wall of the cylinder. An electric push rod is provided on one side of the U-shaped rod. A connecting rod is fixedly connected to the output end of the electric push rod, and the piston rods on both sides of the U-shaped rod are connected to the electric push rod through the connecting rod.

[0007] The effect achieved by the above components is as follows: When using the testing device to test the yield strength of a metal raw material plate, the upper and lower ends of the metal raw material plate are respectively clamped at the U-shaped rod located below the tensile sensor and the U-shaped rod located above the machine base. The narrow edge of the metal plate is brought between the clamping blocks at one end of the two round rods. When the metal plate enters the clamping blocks, it pushes the two clamping blocks away from each other, causing the round rods to slide on the inner wall of the U-shaped rod and compress the springs on the outer side of the round rods. Then, the metal plate is released, and the springs on the outer surfaces of the two round rods on both sides of the U-shaped rod push the clamping blocks to move to the same position, so that one side of the clamping block clamps the surface of the metal plate. Then, the electric push rod on one side of the U-shaped rod retracts, pulling the piston rods on both sides of the U-shaped rod against the inner wall of the cylinder. The cylinder slides downwards, and the piston rod pushes the air inside the cylinder to compress the hydraulic oil inside the storage tank. This hydraulic oil pushes the expansion plate on one side of the inner wall of the storage tank outwards, pressing it against the outer surface of the cylindrical rod. This fixes the position of the cylindrical rod inside the tank and the position of the clamping block outside the U-shaped rod, thus clamping the metal sheet. Then, the hydraulic rod is controlled by the control button on the side of the machine base to move upwards, causing the hydraulic rod to drive the sliding rod to move upwards, generating axial tension on the metal sheet. When the metal sheet yields, the tensile force parameter is obtained by the tensile force sensor, the yield strength is calculated, and displayed on the display screen on the side of the machine base. After the test is completed, the electric push rod is operated to extend and control the piston rod to slide upwards on the inner wall of the cylinder. The expansion plate will return to its original shape, and the metal raw material sheet clamped between the clamping blocks can then be removed.

[0008] Preferably, the clamping block has a beveled edge at the end furthest from the U-shaped rod.

[0009] The effect achieved by the above-mentioned component is that when inserting a metal raw material sheet between the two clamping blocks, it can more easily enter between the two clamping blocks by contacting the inclined surface of the clamping block.

[0010] Preferably, the spring is fitted on the outside of the round rod and its diameter is slightly larger than the inner diameter of the round rod.

[0011] The effect achieved by the above components is that when the clamping block moves and the spring deforms, the round rod will move inside the spring. The round rod can reinforce the internal shape of the spring and minimize the lateral deformation of the spring that may affect normal use.

[0012] Preferably, a plurality of protruding strips are fixedly connected to one side of the top end of the round rod, and the protruding strips are rubber strips made of rubber.

[0013] The effect achieved by the above components is that when the expansion plate on one side of the inner wall of the liquid storage tank expands outward, it presses against the rubber protrusion on the outer surface of the round rod to fix the position of the round rod more stably and prevents accidental slippage.

[0014] Preferably, the outer surface of the round rod is provided with a fastening device, the fastening device including a screw, the outer surface of the screw being threadedly connected to the inner wall of the round rod, a through groove being opened inside the round rod, one end of the screw being located inside the through groove, and a through hole being opened on one side of the clamping block, the through hole communicating with the through groove.

[0015] The effect achieved by the above components is as follows: when the metal raw material sheet is clamped between the two clamping blocks, the surface will be in contact with the through hole on one side of the clamping block. The screw can be rotated on one side of the two round rods to control the screw to move away from the clamping block on the inner wall of the clamping block, thereby drawing the air inside the through groove backward. This causes the through hole on one side of the clamping block to generate suction on the metal raw material sheet, further restricting the position of the metal raw material sheet on one side of the clamping block and improving the stability of the clamping mechanism during operation.

[0016] Preferably, a washer is fixedly connected to one side of the clamping block. The washer is made of rubber and is located on one side of the inner wall of the through hole.

[0017] The effect achieved by the above components is that by setting the rubber gasket ring, the contact area between the metal plate and the clamping block with through holes can be further sealed, so as to avoid gaps between the clamping block and the metal plate affecting the effect of the fastening device.

[0018] Preferably, one end of the screw is fixedly connected to an operating block, and the outer surface of the operating block is provided with several protrusions.

[0019] The effect achieved by the above components is that the protrusions on the outer surface of the operating block make it easier to rotate the operating block to control the screw rotation and prevent the hand from slipping.

[0020] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0021] In this invention, a clamping mechanism is provided. The upper and lower ends of the metal plate are inserted between two clamping blocks on the outer surface of two U-shaped rods. The spring pushes the round rod to move so that the clamping blocks on both sides of the U-shaped rod can move the same distance. The piston rod is controlled by the operation of the electric push rod to move so that the expansion plate on one side of the inner wall of the liquid storage tank is fixed against the outer surface of the round rod facing the clamping block. This ensures that the plate is subjected to the same force on both sides when it is clamped between the two clamping blocks, and avoids the plate from loosening or sliding when it is subjected to tension as much as possible. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a three-dimensional structural diagram of the U-shaped rod of this utility model;

[0024] Figure 3 This is a partial cross-sectional three-dimensional structural diagram of the groove section of this utility model;

[0025] Figure 4 This is a partial cross-sectional three-dimensional structural diagram of the round rod of this utility model.

[0026] Legend: 1. Base; 2. Clamping mechanism; 3. Fastening device; 4. Frame rod; 5. Slide rod; 6. Hydraulic rod; 7. Tension sensor; 21. U-shaped rod; 22. Round rod; 23. Clamping block; 24. Spring; 25. Groove; 26. Liquid storage tank; 27. Expansion plate; 28. Cylinder; 29. ​​Piston rod; 210. Electric push rod; 211. Connecting rod; 212. Protrusion; 31. Through hole; 32. Through groove; 33. Screw; 34. Operating block; 35. Washer ring. Detailed Implementation

[0027] Example 1, such as Figure 1-2 As shown, the metal raw material plate yield strength testing device includes a base 1 and a hydraulic rod 6. The base 1 is placed on the ground to support the entire device. A support rod 4 is provided at the top of the base 1, and a slide rod 5 is slidably connected to the outer surface of the support rod 4. The hydraulic rod 6 is installed on the outside of the base 1 to control the slide rod 5 to slide on the outer surface of the support rod 4. A tension sensor 7 is provided at the bottom of the slide rod 5. Two sets of clamping mechanisms 2 are provided on the outer surface of the base 1. The two sets of clamping mechanisms 2 are respectively installed at the bottom of the tension sensor 7 and one side of the top of the base 1 by bolts.

[0028] Reference Figure 1-3As shown in this embodiment: the clamping mechanism 2 includes a U-shaped rod 21, a clamping block 23, and two round rods 22. The U-shaped rod 21 is bolted to the bottom of the tension sensor 7 or to one side of the top of the base 1. The two round rods 22 slide on the inner wall of the U-shaped rod 21 to connect to the clamping block 23. A spring 24 is provided on one side of the clamping block 23. The spring 24 is used to limit the position of the round rods 22 on the outer surface of the U-shaped rod 21. A groove cylinder 25 is fixedly connected to both sides of the U-shaped rod 21. A liquid storage tank 26 is opened inside the groove cylinder 25. Hydraulic oil is provided inside the liquid storage tank 26. An expansion plate 27 is fixedly connected to one side of the inner wall of the liquid storage tank 26. A cylinder 28 is fixedly connected to the top of the groove cylinder 25. A piston rod is slidably connected to the inner wall of the cylinder 28. 29. An electric push rod 210 is provided on one side of the U-shaped rod 21. The output end of the electric push rod 210 is fixedly connected to a connecting rod 211. The piston rods 29 on both sides of the U-shaped rod 21 are connected to the electric push rod 210 through the connecting rod 211. When the test device is used to test the yield strength of the metal raw material plate, the upper and lower ends of the metal raw material plate are respectively clamped at the U-shaped rod 21 located below the tensile sensor 7 and at the U-shaped rod 21 located above the base 1, so that the narrow edge of the metal plate enters between the clamping blocks 23 at one end of the two round rods 22. When the metal plate enters between the clamping blocks 23, it will push the two clamping blocks 23 away from each other, causing the round rods 22 to slide on the inner wall of the U-shaped rod 21 and compress the springs 24 on the outer side of the round rods 22. After releasing the metal plate, the springs 24 on the outer surfaces of the two round rods 22 on both sides of the U-shaped rod 21 push the clamping block 23 to move to the same position, so that one side of the clamping block 23 clamps the surface of the metal plate. Then, the electric push rod 210 on one side of the U-shaped rod 21 retracts, and the connecting rod 211 pulls the piston rods 29 on both sides of the U-shaped rod 21 to slide downward on the inner wall of the cylinder 28. The piston rods 29 push the air inside the cylinder 28 to compress the hydraulic oil inside the liquid storage tank 26, so that the hydraulic oil pushes the expansion plate 27 on one side of the inner wall of the liquid storage tank 26 to expand outward and press against the outer surface of the round rod 22, fixing the position of the round rod 22 inside the tank 25 and the position of the clamping block 23 outside the U-shaped rod 21, thereby clamping the metal plate. Then, the machine... The control button on one side of the base 1 controls the operation of the hydraulic rod 6, causing the hydraulic rod 6 to drive the slide rod 5 upward, generating an axial tensile force on the metal plate. When the metal plate yields, the tensile force parameter obtained by the tensile sensor 7 is used to calculate the yield strength and display it on the display screen on one side of the base 1. After the test is completed, the electric push rod 210 is operated to extend and control the piston rod 29 to slide upward on the inner wall of the cylinder 28. The expansion plate 27 will return to its original shape, and then the metal raw material plate clamped between the clamping blocks 23 can be removed. By setting up the clamping mechanism 2, the upper and lower ends of the metal plate are respectively inserted between the two clamping blocks 23 on the outer surface of the two U-shaped rods 21. The spring 24 pushes the round rod 22 to move, so that the clamping blocks 23 on both sides of the U-shaped rod 21 can move the same distance.The piston rod 29 is moved by operating the electric push rod 210, causing the expansion plate 27 on one side of the inner wall of the liquid storage tank 26 to abut against the outer surface of the round rod 22 and fix it to the position of the clamping block 23. This ensures that the plate experiences equal force on both sides when clamped between the two clamping blocks 23, and minimizes the risk of loosening or slipping of the plate under tension.

[0029] Reference Figure 2-3 As shown in this embodiment: the edge of the clamping block 23 away from the U-shaped rod 21 is provided with a slope. When the metal raw material plate is inserted between the two clamping blocks 23, it can be more easily inserted between the two clamping blocks 23 by contacting the slope of the surface of the clamping block 23. The spring 24 is sleeved on the outside of the round rod 22 and its diameter is slightly larger than the inner diameter of the round rod 22. When the clamping block 23 moves and causes the spring 24 to deform, the round rod 22 will move inside the spring 24. The round rod 22 can strengthen the internal shape of the spring 24 and avoid the spring 24 from deforming laterally as much as possible, thus affecting normal use.

[0030] Reference Figure 2-3 As shown in this embodiment: a number of protrusions 212 are fixedly connected to one side of the top of the round rod 22. The protrusions 212 are rubber strips made of rubber. When the expansion plate 27 on one side of the inner wall of the liquid storage tank 26 expands outward, it abuts against the rubber protrusions 212 on the outer surface of the round rod 22 to fix the position of the round rod 22 more stably and prevent accidental slippage.

[0031] Reference Figure 1 , Figure 3 and Figure 4 As shown in this embodiment: a fastening device 3 is provided on the outer surface of the round rod 22. The fastening device 3 includes a screw 33. The outer surface of the screw 33 is threadedly connected to the inner wall of the round rod 22. A through groove 32 is opened inside the round rod 22. One end of the screw 33 is located inside the through groove 32. A through hole 31 is opened on one side of the clamping block 23. The through hole 31 communicates with the through groove 32. When the metal raw material plate is clamped between the two clamping blocks 23, the surface will be in contact with the through hole 31 on one side of the clamping block 23. The screw 33 can be rotated on one side of the two round rods 22 to control the screw 33 to move away from the clamping block 23 on the inner wall of the clamping block 23. The air inside the through groove 32 is drawn backward, so that the through hole 31 on one side of the clamping block 23 generates suction force on the metal raw material plate, further restricting the position of the metal raw material plate on one side of the clamping block 23 and improving the stability of the clamping mechanism 2 when it is in operation.

[0032] Reference Figure 3 and Figure 4As shown in this embodiment: a washer 35 is fixedly connected to one side of the clamping block 23. The washer 35 is made of rubber and is located on one side of the inner wall of the through hole 31. By setting the rubber washer 35, the contact area between the metal plate and the surface of the clamping block 23 with the through hole 31 can be further sealed, so as to avoid gaps between the clamping block 23 and the metal plate affecting the effect of the fastening device 3. An operating block 34 is fixedly connected to one end of the screw 33. Several protrusions are provided on the outer surface of the operating block 34. Holding the protrusions on the outer surface of the operating block 34 makes it easier to rotate the operating block 34 to control the rotation of the screw 33 and prevents the hand from slipping.

[0033] Working principle: When using the testing device to test the yield strength of metal raw material plates, the upper and lower ends of the metal raw material plate are respectively clamped at the U-shaped rod 21 located below the tensile sensor 7 and the U-shaped rod 21 located above the base 1. The narrow edge of the metal plate is positioned between the clamping blocks 23 at one end of the two round rods 22. When the metal plate enters the clamping blocks 23, it pushes the two clamping blocks 23 away from each other, causing the round rods 22 to slide on the inner wall of the U-shaped rods 21 and compress the springs 24 on the outer side of the round rods 22. After releasing the metal plate, the springs 24 on the outer surfaces of the two round rods 22 on both sides of the U-shaped rod 21 push the clamping block 23 to move to the same position, so that one side of the clamping block 23 clamps the surface of the metal plate. Then, the electric push rod 210 on one side of the U-shaped rod 21 retracts, and the piston rods 29 on both sides of the U-shaped rod 21 are pulled down by the connecting rod 211 to slide downward on the inner wall of the cylinder 28. The piston rods 29 push the air inside the cylinder 28 to compress the hydraulic oil inside the reservoir 26, so that the hydraulic oil pushes the expansion valve on one side of the inner wall of the reservoir 26. The expansion plate 27 expands outward and presses against the outer surface of the round rod 22, fixing the position of the round rod 22 inside the groove 25 and the position of the clamping block 23 outside the U-shaped rod 21, thereby clamping the metal sheet. Then, the screw 33 is rotated on one side of each of the two round rods 22 to control the screw 33 to move away from the clamping block 23 on the inner wall of the clamping block 23, drawing the air inside the through groove 32 backward, so that the through hole 31 on one side of the clamping block 23 generates suction force on the metal material sheet, thus fixing the position of the metal material sheet on one side of the clamping block 23. Further limiting the operation, the hydraulic rod 6 is controlled by the control button on one side of the base 1, which causes the hydraulic rod 6 to move the slide bar 5 upward, generating an axial tensile force on the metal plate. When the metal plate yields, the tensile force parameter is obtained by the tensile sensor 7, the yield strength is calculated and displayed on the display screen on one side of the base 1. After the test is completed, the electric push rod 210 is operated to extend and control the piston rod 29 to slide upward on the inner wall of the cylinder 28. The expansion plate 27 will return to its original shape, and then the metal raw material plate clamped between the clamping blocks 23 can be removed.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may use the disclosed technical content to make changes or modifications to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the scope of the utility model's technical solution, still fall within the protection scope of this utility model's technical solution. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through specific circumstances.

Claims

1. A device for testing the yield strength of a metal raw material plate, comprising a base (1) and a hydraulic ram (6), characterized in that: The base (1) is placed on the ground to bear the whole device, the top of the base (1) is provided with a frame rod (4), the outer surface of the frame rod (4) is slidably connected with a sliding rod (5); a hydraulic rod (6) is installed on the outer side of the base (1) to control the sliding of the sliding rod (5) on the outer surface of the frame rod (4), the bottom end of the sliding rod (5) is provided with a tension sensor (7), the outer surface of the base (1) is provided with two sets of clamping mechanisms (2), and the two sets of clamping mechanisms (2) are respectively installed at the bottom end of the tension sensor (7) and the top end of the base (1) through bolts.

2. The metal feedstock sheet yield strength testing apparatus of claim 1, wherein: The clamping mechanism (2) includes a U-shaped rod (21), a clamping block (23) and two round rods (22), the U-shaped rod (21) is installed at the bottom end of the tension sensor (7) or the top end of the base (1) through bolts, the two round rods (22) are slidably connected with the clamping block (23) on the inner wall of the U-shaped rod (21), one side of the clamping block (23) is provided with a spring (24), the spring (24) is used for limiting the position of the round rod (22) on the outer surface of the U-shaped rod (21), the two sides of the U-shaped rod (21) are fixedly connected with a groove cylinder (25), the inside of the groove cylinder (25) is provided with a liquid storage groove (26), the inside of the liquid storage groove (26) is provided with hydraulic oil, one side of the inner wall of the liquid storage groove (26) is fixedly connected with an expansion sheet (27), the top end of the groove cylinder (25) is fixedly connected with a cylinder (28), the inner wall of the cylinder (28) is slidably connected with a piston rod (29), one side of the U-shaped rod (21) is provided with an electric push rod (210), the output end of the electric push rod (210) is fixedly connected with a connecting rod (211), and the piston rods (29) on the two sides of the U-shaped rod (21) are connected with the electric push rod (210) through the connecting rod (211).

3. The metal feedstock sheet yield strength testing apparatus of claim 2, wherein: The clamping block (23) is provided with an inclined surface at the edge of the end away from the U-shaped rod (21).

4. The metal feedstock sheet yield strength testing apparatus of claim 3, wherein: The spring (24) is sleeved on the outer side of the round rod (22) and has a diameter slightly larger than the inner diameter of the round rod (22).

5. The metal feedstock sheet yield strength testing apparatus of claim 4, wherein: The top end of the round rod (22) is fixedly connected with a plurality of convex strips (212), and the convex strips (212) are rubber strips made of rubber material.

6. The metal feedstock sheet yield strength testing apparatus of claim 5, wherein: The outer surface of the round rod (22) is provided with a fastening device (3), the fastening device (3) includes a screw rod (33), the outer surface of the screw rod (33) is threadedly connected with the inner wall of the round rod (22), the inside of the round rod (22) is provided with a through groove (32), one end of the screw rod (33) is located in the inside of the through groove (32), and one side of the clamping block (23) is provided with a through hole (31) penetrating through the through groove (32).

7. The metal feedstock sheet yield strength testing apparatus of claim 6, wherein: One side of the clamping block (23) is fixedly connected with a gasket ring (35), and the gasket ring (35) is made of rubber material and located on one side of the inner wall of the through hole (31).

8. The metal feedstock sheet yield strength testing apparatus of claim 6, wherein: One end of the screw rod (33) is fixedly connected with an operating block (34), and the outer surface of the operating block (34) is provided with a plurality of protrusions.

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