A new type of static pulling machine load test platform

Abstract

The present invention discloses a novel static drawing machine load test platform, which relates to the field of structural strength testing. By using the ear piece hinge as a coaxiality adjustment structure, the accuracy of the force detected when the static drawing machine is loaded can be improved; and the adjustable screw can meet the loading of the static drawing machine under different strokes, thereby improving the continuity of the loading detection. The test platform includes an outer frame, an ear pin connection structure, a force measuring element, a wedge block fixing structure, and a mandrel for connecting the static drawing machine; the outer frame includes a bottom plate, a top plate, and a side plate fixedly connected therebetween, the force measuring element is connected to the bottom plate through the ear pin connection structure, and is connected to the mandrel through the wedge block fixing structure, and the mandrel passes through the top plate; the force measuring element includes an adjustable short threaded rod, a sensor fixing seat, a force measuring sensor, and an adjustable long threaded rod. The load detection platform has a simple and reasonable structure, is easy to operate, and improves the continuity of detection.

Description

Technical Field

[0001] The invention relates to the field of structural strength testing, in particular to a static tension machine load testing platform. Background Art

[0002] Structural strength testing refers to the static strength or mechanical property testing of metal and non-metal materials, parts, structural products, etc. under specified conditions. Standard test pieces can be tested on standard load strength testing machines. For more mechanical structural products, they are often tested and verified by building appropriate test platforms.

[0003] Static drawing machine is a new type of equipment for cold processing of mechanical parts that generates tension through hydraulic and pneumatic control. It clamps the alloy steel round bar through the hole sleeve to make it undergo cold expansion and plastic deformation to increase the life of the processed parts. In order to ensure the reliability of the static drawing machine, the load generated by its work needs to be tested before it is put into use.

[0004] The existing detection platform usually has one end connected and fixed to the sensor, and the other end is loaded by the static pulling machine. The magnitude of the load generated by the static pulling machine is obtained through the sensor numerical feedback. However, the load detection of the static pulling machine still has the following problems:

[0005] 1. The coaxiality of the detection platform is not good, and the force loading is biased; 2. The detection stroke is discontinuous and the disassembly process is troublesome; 3. Different models of static pulling machines require the replacement of the detection structure, which is inconvenient. Summary of the invention

[0006] In view of the above problems, the present invention proposes a novel static drawing machine load test platform, which is a structural load test platform composed of an ear hinge and an adjustable screw. The ear hinge is used as a coaxiality adjustment structure to improve the accuracy of the force detected when the static drawing machine is loaded; and the adjustable screw can meet the loading of the static drawing machine under different strokes, thereby improving the continuity of the loading detection.

[0007] The technical solution of the present invention is as follows: the test platform comprises an outer frame, an ear pin connection structure, a force measuring element, a wedge fixing structure and a mandrel 17 for connecting a static pulling machine; the outer frame comprises a bottom plate 2, a top plate 4 and a side plate 3 fixedly connected therebetween, the force measuring element is connected to the bottom plate 2 via an ear pin connection structure, and is connected to the mandrel 17 via a wedge fixing structure, and the mandrel 17 passes through the top plate 4;

[0008] The force measuring element comprises an adjustable short threaded rod 10, a sensor fixing seat 11, a force sensor 12 and an adjustable long threaded rod 14. The two ends of the adjustable short threaded rod 10 are respectively provided with two sections of external threads with opposite rotation directions, and one end of the adjustable short threaded rod 10 is threadedly connected to the ear pin connection structure, and the other end is threadedly connected to the sensor fixing seat 11; the two ends of the adjustable long threaded rod 14 are also respectively provided with two sections of external threads with opposite rotation directions, and one end of the adjustable long threaded rod 14 is threadedly connected to the force sensor 12, and the other end is threadedly connected to the wedge fixing structure; the force sensor 12 is fixedly mounted on the sensor fixing seat 11. In this way, the spacing between the force sensor 12 and the ear pin connection structure can be changed by rotating the adjustable short threaded rod 10, and the spacing between the force sensor 12 and the wedge fixing structure can be changed by rotating the adjustable long threaded rod 14, thereby finally changing the extension amount of the mandrel 17 from the top plate, thereby completing the load detection of the static pulling machine under different strokes, so as to meet the load detection requirements of the test static pulling machine under different piston strokes, and significantly improve the continuity of detection.

[0009] In actual use, after the platform structure is installed, Figure 1 The state shown is placed upside down on a workbench, and a hole is left in the middle of the workbench to allow the static puller 19 to pass through. The static puller 19 is provided with a bayonet to clamp the head groove of the core rod 17. Therefore, when not loaded, the static puller 19 is freely suspended by the core rod 17. When loading begins, the piston inside the static puller 19 moves, which is manifested externally as the static puller 19 first slowly moving upward, then hitting the top plate 4 and tightening the core rod 17, so that the entire test platform structure begins to bear, and the force sensor 12 begins to detect the load.

[0010] Further, the ear pin connection structure comprises a third ear piece 5, a second ear piece 6 and a first ear piece 9 which are hinged in sequence, a large nut plate 1 is fixedly connected to the bottom plate 2, the third ear piece 5 is threadedly connected to the large nut plate 1, and the first ear piece 9 is threadedly connected to the adjustable short threaded rod 10;

[0011] The third ear piece 5 and the second ear piece 6 are hinged by the second pin 7, and the second ear piece 6 and the first ear piece 9 are hinged by the first pin 8, and the second pin 7 is perpendicular to the first pin 8. Since the test platform is used inverted, the first ear piece 9 and the second ear piece 6 can rotate around the first pin 8, the second ear piece 6 and the third ear piece 5 can rotate around the second pin 7, and the force sensor 12 is located at the front end of the ear pin connection structure, so that the coaxiality of the static tension machine and the force sensor is improved, and the accuracy of force loading is achieved.

[0012] Furthermore, the wedge block fixing structure includes a wedge block outer hoop 13, a wedge block 15, a positioning block 18 and an anti-slip steel strip 16, the adjustable length threaded rod 14 is threadedly connected to the wedge block outer hoop 13, a wedge-shaped receiving groove is provided in the wedge block outer hoop 13, the wedge block 15 has a pair, a pair of wedge blocks 15 are accommodated in the wedge-shaped receiving groove, and a wedge-shaped notch is provided on the wedge block 15, the pair of notches are arranged oppositely, so as to form an accommodation space between the pair of wedge blocks 15, one end of the mandrel 17 is wedge-shaped, and passes through the top plate 4 and the wedge block outer hoop 13 and extends into the accommodation space;

[0013] The anti-skid steel strip 16 is detachably connected to the notch of the wedge-shaped groove, and the positioning block 18 is arranged at the bottom of the wedge-shaped groove. The bottom of the wedge-shaped groove is also provided with a long bolt that passes through the wedge block outer hoop 13. The long bolt is threadedly connected to the wedge block outer hoop 13 and abuts against the positioning block 18, so that a pair of wedge blocks 15 are confined between the anti-skid steel strip 16 and the positioning block 18.

[0014] The entire test platform is placed in an inverted position, which makes it easier to rotate the threaded rod. The thread of the adjustable short threaded rod 10 that allows rotation and adjustment is the part connected to the first ear piece 9. When rotating, the first ear piece 9 is supported while the adjustable short threaded rod 10 is rotated, thereby adjusting the distance between the first ear piece 9 and the sensor fixing seat 11. The thread of the adjustable long threaded rod 14 that allows rotation and adjustment is the part connected to the wedge block outer hoop 13. When rotating, the adjustable long threaded rod 14 is supported while the wedge block outer hoop 13 is rotated, thereby adjusting the distance between the wedge block outer hoop 13 and the force sensor 12.

[0015] Furthermore, the top plate 4 is detachably connected with a boss pad 20, in which a through hole adapted to the mandrel 17 is provided. In order to meet the detection of different types of static drawing machines, the mandrel 17, the wedge block 15 and the boss pad 20 are provided with different sizes, and the top hole of the wedge block outer hoop 13 and the through hole of the top plate 4 are provided with the mandrel 17 of the thickest size. When performing detection and replacement, it is only necessary to open the anti-slip steel strip 16, replace the corresponding mandrel 17, the adapted wedge block 15 and the adapted boss pad 20 to realize detection and replacement.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The load detection platform has a simple and reasonable structure and is easy to operate. Its structural design ensures the coaxiality of the detection platform, making the test loading smoother and the load detection more accurate. The thread depth of the two sets of screws can be adjusted to meet the load detection of the test static pulling machine under different piston strokes and improve the continuity of the detection.

[0018] 2. Different types of static drawing machines use different core rods. The platform can replace the thickness of the fixed wedge and the through-hole size of the boss pad on the top plate of the outer frame according to the core rods of different thicknesses, so as to realize the load detection of different types of static drawing machines. The replacement detection structure is simpler and more convenient.

[0019] 3. The connection between the various parts of the load detection platform is simple and reliable, the platform is easy to build and disassemble, the load and stability of each part meet the material requirements, and the addition of anti-instability trusses further improves its safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 2 It is a three-dimensional overall schematic diagram of the "ear-pin" connection structure, force measuring element, wedge block fixing structure and testing equipment of the present invention;

[0022] Figure 3 A schematic diagram of the positional relationship of the wedge block, the core rod and the positioning block of the present invention;

[0023] Figure 4 It is a schematic diagram of the connection relationship between the wedge block, the wedge block outer hoop and the anti-slip steel sheet of the present invention.

[0024] Figure 5 This is a schematic diagram of the position of the adjustment hole of the wedge block outer hoop positioning block of the present invention.

[0025] In the figure: 1. large nut plate; 2. outer frame bottom plate; 3. outer frame side plate; 4. outer frame top plate; 5. third ear piece; 6. second ear piece; 7. second pin; 8. first pin; 9. first ear piece; 10. adjustable short threaded rod; 11. sensor fixing seat; 12. force sensor; 13. wedge block outer hoop; 14. adjustable long threaded rod; 15. wedge block; 16. anti-slip steel bar; 17. core rod; 18. positioning block; 19. static pulling machine; 20. boss pad. DETAILED DESCRIPTION

[0026] In order to clearly illustrate the technical features of this patent, this patent is elaborated in detail below through a specific implementation method and in combination with its accompanying drawings.

[0027] like Figure 1-5The present invention provides a new load test platform for a new type of static pulling machine, including an outer frame bottom plate 2, a through hole is provided in the center of the outer frame bottom plate 2 to allow a third ear piece 5 to pass through, outer frame side plates 3 are installed on both sides of the outer frame bottom plate 2, an outer frame top plate 4 is installed on the top of the outer frame side plate 3, a replaceable boss pad 20 is provided on the top plate 4, and a through hole is provided in the center of the outer frame top plate 4 and the boss pad 20 to allow a core rod 17 to pass through, and the bottom plate 2, the side plate 3 and the top plate 4 are connected by bolts to form an outer frame of the platform. The lower section of the third ear piece 5 is a threaded rod, which can pass through the central circular hole of the bottom plate 2 and be fixed on the bottom plate 2 by the large nut plate 1. The upper ear piece part of the third ear piece 5 is connected to the lower ear piece part of the second ear piece 6 by a second pin 7, and the second ear piece 6 and the third ear piece 5 can rotate around the second pin 7. The design direction of the upper ear piece of the second ear piece 6 is perpendicular to the plane where the direction of the lower ear piece is located. The upper ear piece part of the second ear piece 6 is connected to the lower ear piece part of the first ear piece 9 by a first pin 8, and the first ear piece 9 and the second ear piece 6 can rotate around the first pin 8. The upper section of the first ear piece 9 is set as a rectangular iron block, and a threaded hole is provided on the top surface to adapt to the lower section of the adjustable short threaded rod 10. The upper section of the adjustable short threaded rod 10 is provided with a reverse thread in the opposite direction to the lower section. The sensor fixing seat 11 is a cylindrical T-shaped platform structure, with a threaded hole adapted to the upper section of the adjustable short threaded rod 10 in the middle, and 16 threaded holes are provided around it for fixing the force sensor 12. The force sensor 12 is a spoke-type sensor, with a threaded hole in the middle that fits the thread of the lower segment of the adjustable long threaded rod 14. The upper segment of the adjustable long threaded rod 14 is provided with a reverse thread in the opposite direction of the lower segment, and the wedge outer hoop 13 is provided with a long threaded hole for installing the upper segment of the adjustable long threaded rod 14. The side of the wedge outer hoop 13 is provided with a mounting groove for the wedge 15, and the wedge 15 and the mounting groove are in inclined contact and matching. The top surface of the wedge outer hoop 13 is provided with a round hole to allow the core rod 17 to pass through. The tail of the core rod 17 is wedge-shaped and can fit with the inclined surface of the wedge-shaped notch of the wedge 15, and cooperates with the positioning block 18 and the anti-slip steel strip 16 to meet the fixing effect of the core rod.

[0028] refer to Figure 1-2 The test platform is placed upside down, and the center of gravity of all structures coincides, which improves the coaxiality of the structure and facilitates installation and operation. The force sensor 12 is set at the front end of the ear pin connection structure, and the force is transmitted stably through the rotation of the ear pin connection structure to ensure that the load generated by the static tension machine 19 is always on the same axis as the force sensor 12, achieving the accuracy of force loading.

[0029] refer to Figure 3-5The inclined surface of the wedge block 15 is longitudinally grooved to a depth that the center of the core rod can coincide with the center of the circular hole on the top surface of the wedge block outer hoop 13, and the positioning block 18 is provided with a threaded hole. The side of the wedge block outer hoop 13 is provided with a threaded hole A of the same size as the positioning block, allowing a long bolt to pass through the hole A to connect the positioning block 18, and the position of the positioning block 18 can be adjusted by screwing in the depth, thereby achieving the positioning and fixing effect of the core rod. The notch of the wedge-shaped placement groove of the wedge block outer hoop 13 is provided with an anti-slip steel strip 16 to prevent the wedge block 15 from slipping out due to a slight deviation of the load axis during the static drawing machine loading process.

[0030] In the present invention, reference Figure 1 When in use, install the various structural parts of the test platform in the above order. First, screw all the threaded connections to the tightest position. The length of the mandrel 17 protruding from the boss pad 20 on the top plate 4 can just meet the load test under the shortest stroke of the static drawing machine. If the static drawing machine needs to be loaded at different stroke distances, it can be achieved by rotating the upper threaded section connected by the adjustable long threaded rod 14 and the wedge outer hoop 13 and the lower threaded section connected by the adjustable short threaded rod 10 and the first ear piece 9 to increase the length of the mandrel 17 protruding from the top plate 4. If necessary, the boss pad 20 can be removed and the length of the third ear piece 5 screwed out of the large nut plate 1 can be adjusted to adjust the stroke to a larger extent. In this way, the problem of adapting to different strokes by disassembling and setting a longer mandrel 17 can be avoided, and the continuity of detection under different strokes can be achieved.

[0031] refer to Figure 3-4 In order to meet the inspection requirements of different types of static drawing machines, the core rod 17, the wedge block 15 and the boss pad 20 are of different sizes. The top hole of the wedge outer hoop 13 and the through hole of the top plate 4 are set with the core rod 17 of the thickest size. When performing inspection and replacement, you only need to open the anti-slip steel bar 16, replace the corresponding core rod 17, the matching wedge block 15 and the appropriate boss pad 20 to achieve inspection and replacement.

[0032] It should be noted that the reference Figure 1 Because the overall structure of the present invention is relatively long, when bearing a huge load, the anti-instability beam can be installed through the threaded holes on the outer frame side plate 3 to ensure the stability of the structure. The standard parts used in the present invention can all be purchased from the market. The design of the adjustable long threaded rod 14, the adjustable short threaded rod 10, the sensor fixing seat 11 and the matching threaded holes all depend on the size of the purchased force sensor 12. Other special-shaped parts are designed according to the requirements of the test load.

[0033] There are many specific implementation ways of the present invention. The above is only the preferred implementation mode of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principle of the present invention. These improvements should also be regarded as the protection scope of the present invention.

Claims

1. A new static pulling machine load test platform, characterized in that: The test platform comprises an outer frame, an ear pin connection structure, a force measuring element, a wedge fixing structure and a mandrel (17) for connecting to a static pulling machine; the outer frame comprises a bottom plate (2), a top plate (4) and a side plate (3) fixedly connected therebetween; the force measuring element is connected to the bottom plate (2) via the ear pin connection structure and is connected to the mandrel (17) via the wedge fixing structure; the mandrel (17) passes through the top plate (4); The force measuring element comprises an adjustable short threaded rod (10), a sensor fixing seat (11), a force sensor (12) and an adjustable long threaded rod (14); two ends of the adjustable short threaded rod (10) are respectively provided with two sections of external threads with opposite rotation directions, and one end of the adjustable short threaded rod (10) is threadedly connected to the ear pin connection structure, and the other end is threadedly connected to the sensor fixing seat (11); two ends of the adjustable long threaded rod (14) are also respectively provided with two sections of external threads with opposite rotation directions, and one end of the adjustable long threaded rod (14) is threadedly connected to the force sensor (12), and the other end is threadedly connected to the wedge fixing structure; the force sensor (12) is fixedly mounted on the sensor fixing seat (11); The ear pin connection structure comprises a third ear piece (5), a second ear piece (6) and a first ear piece (9) which are hinged in sequence, a large nut plate (1) is fixedly connected to the base plate (2), the third ear piece (5) is threadedly connected to the large nut plate (1), and the first ear piece (9) is threadedly connected to the adjustable short threaded rod (10); The third ear piece (5) and the second ear piece (6) are hingedly connected via a second pin (7), the second ear piece (6) and the first ear piece (9) are hingedly connected via a first pin (8), and the second pin (7) and the first pin (8) are perpendicular to each other; The wedge block fixing structure comprises a wedge block outer hoop (13), a wedge block (15), a positioning block (18) and an anti-slip steel strip (16); the adjustable length threaded rod (14) is threadedly connected to the wedge block outer hoop (13); a wedge-shaped receiving groove is provided in the wedge block outer hoop (13); the wedge block (15) has a pair of wedge blocks (15), the pair of wedge blocks (15) are received in the wedge-shaped receiving groove, and a wedge-shaped notch is provided on the wedge block (15), the pair of notches are arranged opposite to each other, so as to form a receiving space between the pair of wedge blocks (15); one end of the core rod (17) is wedge-shaped and passes through the top plate (4) and the wedge block outer hoop (13) to extend into the receiving space; The anti-skid steel strip (16) is detachably connected to the notch of the wedge-shaped groove, and the positioning block (18) is arranged at the bottom of the wedge-shaped groove. The bottom of the wedge-shaped groove is also provided with a long bolt that passes through the wedge block outer hoop (13). The long bolt is threadedly connected to the wedge block outer hoop (13) and abuts against the positioning block (18), so that a pair of wedge blocks (15) are restricted between the anti-skid steel strip (16) and the positioning block (18).

2. A new static pulling machine load test platform according to claim 1, characterized in that: The top plate (4) is also detachably connected to a boss pad (20), and a through hole adapted to fit the core rod (17) is provided in the boss pad (20).

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