Metal plate strength detection equipment

Abstract

The invention relates to the technical field of plate detection, in particular to metal plate strength detection equipment which comprises a cabinet body, a detection table is arranged on the upper surface of the cabinet body, a mounting cover is fixedly arranged on the upper surface of the detection table, a taking and placing opening is formed in one side of the mounting cover, and a mounting plate is fixedly arranged in the cabinet body. A mounting plate is arranged on the upper surface of the detection table, a vertically-arranged first hydraulic cylinder is fixedly mounted in the mounting plate, a lifting plate is fixedly mounted at the telescopic end of the first hydraulic cylinder, vertical plates are symmetrically arranged on the upper surface of the lifting plate, pressure applying rods are rotationally arranged at the top ends of the vertical plates, and bending openings allowing the pressure applying rods to penetrate through are formed in the upper surface of the detection table. According to the detection equipment, plates can be conveniently placed, stable detection is guaranteed through limiting and abutting clamping, the strength can be accurately recorded, bending data can be accurately recorded, meanwhile, the metal plates can be reset, creases can be conveniently observed, the fatigue resistance is evaluated, and the use effect of the equipment and the comprehensiveness of detection are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of plate detection, and in particular to a metal plate strength detection device. Background Art

[0002] In the field of metal material processing and application, the strength and fatigue resistance of metal sheets are the core indicators for measuring their quality, which are directly related to the safety and service life of the end products. Therefore, accurate testing of metal sheets is of great significance. However, existing metal sheet strength testing equipment has many technical limitations in practical applications and cannot meet the needs of efficient and accurate testing.

[0003] Traditional testing equipment has obvious deficiencies in the plate positioning link and lacks a reliable limit and leveling mechanism. After the metal plate is placed on the testing table, it is easy to shift or tilt due to external interference or equipment vibration, which directly affects the bending process; and in the bending detection process, the existing equipment has low control accuracy of force and angle. Most equipment cannot accurately record the dynamic relationship between bending force and corresponding angle in real time, and can only obtain results through empirical judgment or rough measurement, making it difficult to establish a scientific basis for strength assessment; in addition, existing equipment has shortcomings in fatigue resistance assessment. The bent plate is often difficult to reset smoothly, and secondary damage is easily generated during the reset process, resulting in the inability to accurately observe the crease status.

[0004] At the same time, the various links in the traditional inspection process are not smoothly connected, and operations such as positioning, clamping, bending, and resetting require frequent manual intervention, which not only increases the complexity of the operation, but also reduces the inspection efficiency and is difficult to adapt to batch inspection needs. Therefore, it is urgent to design a metal sheet strength testing equipment to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to solve the defects in the prior art and to propose a metal plate strength testing device.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A metal sheet strength testing device comprises a cabinet, an upper surface of the cabinet is provided with a testing platform, and an installation cover is fixedly provided on the upper surface of the testing platform, a pick-up and drop-out opening is opened on one side of the installation cover, a mounting plate is fixedly provided in the cabinet, and a vertically arranged first hydraulic cylinder is fixedly installed in the mounting plate, a lifting plate is fixedly installed on the telescopic end of the first hydraulic cylinder, a vertical plate is symmetrically provided on the upper surface of the lifting plate, and a pressure rod is rotatably provided on the top of the vertical plate, a bending opening for the pressure rod to pass through is opened on the upper surface of the testing platform, a limit frame is also fixedly provided on the lower surface of the testing platform, and the vertical plate passes through the limit frame, and further comprises: A bending mechanism, which is fixedly disposed in the mounting cover and is used to cause the metal sheet to bend when the upwardly moving metal sheet contacts the bending mechanism and to detect the bending force exerted on the metal sheet; A holding mechanism, which is provided on the upper surface of the lifting plate and is used to clamp the metal sheet between the bending mechanism and the holding mechanism when the lifting plate moves upward; A restoring mechanism, the restoring mechanism being arranged in the mounting cover and being used for restoring the bent metal sheet; The limiting mechanism is arranged above the mounting plate and is used to automatically apply a downward holding force to both sides of the metal plate when the lifting plate moves upward.

[0007] As a further solution of the present invention: the bending mechanism includes a horizontal plate fixedly installed in the mounting cover, a vertically arranged movable column movably installed in the horizontal plate, a baffle fixedly installed on the top end of the movable column, and a baffle fixedly installed on the bottom end of the movable column, a pressure sensor is arranged between the horizontal plate and the baffle, and the cross-section of the baffle is semicircular, with the arc surface facing downward.

[0008] As a further solution of the present invention: the supporting mechanism includes a supporting rod passing through the mounting plate and the lifting plate, the top of the supporting rod is symmetrically installed with a supporting piece, the bottom end of the supporting rod is fixedly installed with a bottom plate, and the bottom plate and the lifting plate are connected by a first spring, and the upper surface of the detection platform is provided with a supporting opening for the supporting rod to pass through.

[0009] As a further solution of the present invention: the restoration mechanism includes a second hydraulic cylinder fixedly installed in the mounting cover, and the telescopic end of the second hydraulic cylinder is fixedly installed with a lowering plate, the lower surface of the lowering plate is symmetrically installed with support rods distributed at equal distances, and the end of the support rod is fixedly installed with a restoration rod.

[0010] As a further solution of the present invention: the limiting mechanism includes a mounting bracket fixedly arranged on the lower surface of the detection platform, and a vertically arranged movable cylinder is installed through the mounting bracket, and the movable cylinder and the mounting bracket are movably connected, the top end of the movable cylinder passes through the detection platform, the movable cylinder is connected to a telescopic rod through a second spring, and the top end of the telescopic rod is fixedly installed with a limiting strip located above the detection platform, and the lower side of the limiting strip is provided with an oblique chamfer for supporting the side of the metal plate to be detected, the outer wall of the movable cylinder is also fixedly installed with a fixed disk, and the fixed disk A limit rod is fixedly installed on the lower surface of the limit rod, the limit rod passes through the mounting bracket, and a baffle is fixedly installed on the bottom end of the limit rod, a third spring is sleeved on the outer side of the limit rod, and the two ends of the third spring are respectively connected to the mounting bracket and the baffle, the bottom end of the movable cylinder is connected to the mounting piece through the fourth spring, and a traction rope is fixedly installed on the bottom end of the mounting piece, the other end of the traction rope is connected to the lower surface of the lifting plate, a fixed shaft is also fixedly installed in the cabinet body, and a fixed pulley is rotatably installed on the outer side of the fixed shaft, and the traction rope is sleeved on the outer side of the fixed pulley.

[0011] As a further solution of the present invention: the upper surface of the detection platform is further provided with a receiving groove that matches the limiting strip, and when the limiting strip is received in the receiving groove, the top end of the limiting strip is lower than the notch of the receiving groove.

[0012] As a further solution of the present invention: a blocking piece is fixedly installed in the receiving groove away from the taking and placing port, and a notch is opened on the outer wall of one side of the limiting strip corresponding to the blocking piece to match the blocking piece.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a metal plate strength testing device. The metal plate sample to be tested can be easily placed on the surface of the testing table through the take-and-place port on one side of the installation cover. The operation is convenient. During the test, the first hydraulic cylinder drives the lifting plate to move up. During the process, the limit mechanism is first triggered to form precise limits on the left and right sides of the metal plate. This operation fixes the left and right positions of the plate, providing a stable foundation for subsequent testing steps, and avoiding the impact of plate displacement on the detection accuracy.

[0014] As the lifting plate continues to move upward, the supporting mechanism on its surface passes through the inspection table and steadily lifts up the metal sheet on the table. Since the limiting mechanism has fixed the left and right positions of the sheet, the sheet can always remain horizontal and move upward synchronously during the supporting process until it is firmly clamped between the supporting mechanism and the bending mechanism. This stable clamping method ensures that the sheet will not shake or shift during subsequent bending tests, ensuring the reliability of the testing process.

[0015] As the lifting plate moves further upward, the pressure rod at the top of the vertical plate uses the bending mechanism as a fulcrum to apply pressure to both sides of the metal plate, causing the plate to gradually bend with the bending mechanism as the center. During the bending process, the bending mechanism records the bending force in real time, and at the same time accurately calculates the real-time bending angle based on the upward movement of the pressure rod, and derives the dynamic relationship between the two, thereby accurately judging the strength performance of the metal plate and providing accurate data support for the evaluation.

[0016] After a metal sheet is bent, it can be reset through a restoration mechanism. After reset, its fatigue resistance can be judged by observing the crease status on the surface of the sheet. The entire testing process is coherent and efficient, which can not only accurately obtain strength data, but also comprehensively evaluate fatigue resistance, greatly improving the use effect of the equipment and the comprehensiveness of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a metal sheet strength testing device from a first perspective provided by an embodiment of the present invention; Figure 2 A schematic diagram of the internal structure of a metal plate strength testing device provided by an embodiment of the present invention; Figure 3 A schematic diagram of a half-section structure of a metal plate strength testing device provided by an embodiment of the present invention; Figure 4 for Figure 3 A in the figure shows the enlarged structural diagram; Figure 5 A schematic structural diagram of a mounting plate and a lifting plate from a first perspective in a metal plate strength testing device provided by an embodiment of the present invention; Figure 6 A schematic structural diagram of a bending mechanism in a metal sheet strength testing device provided by an embodiment of the present invention; Figure 7 A schematic structural diagram of a mounting plate and a lifting plate from a second perspective in a metal plate strength testing device provided by an embodiment of the present invention; Figure 8 for Figure 7 A schematic diagram of the structure at point B in FIG. Figure 9 A schematic diagram of the structure of a mounting plate and a lifting plate from a third perspective in a metal plate strength testing device provided by an embodiment of the present invention; Figure 10 A schematic structural diagram of a testing platform in a metal sheet strength testing device provided by an embodiment of the present invention; Figure 11 A schematic structural diagram from a second perspective of a metal sheet strength detection device provided by an embodiment of the present invention.

[0018] In the figure: 101-cabinet, 102-testing table, 103-installation cover, 104-take-and-put port, 105-installation plate, 106-first hydraulic cylinder, 107-lifting plate, 108-bending port, 109-limiting frame, 110-vertical plate, 111-pressure rod, 201-retaining rod, 202-retaining plate, 203-retaining port, 204-bottom plate, 205-first spring, 301-horizontal plate, 302-movable column, 303-blocking plate, 304-blocking bar, 305-pressure sensor, 4 01-second hydraulic cylinder, 402-downward moving plate, 403-support rod, 404-restoring rod, 501-fixed shaft, 502-fixed pulley, 503-traction rope, 504-mounting frame, 505-movable cylinder, 506-telescopic rod, 507-limiting bar, 508-second spring, 509-fixed plate, 510-limiting rod, 511-third spring, 512-baffle, 513-fourth spring, 514-mounting plate, 601-storage slot, 701-notch, 702-blocking plate. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0020] like Figures 1-11 As shown, a metal plate strength testing device provided by an embodiment of the present invention includes a cabinet 101, a testing platform 102 is provided on the upper surface of the cabinet 101, and a mounting cover 103 is fixedly provided on the upper surface of the testing platform 102, a pick-up and drop-out port 104 is provided on one side of the mounting cover 103, a mounting plate 105 is fixedly provided in the cabinet 101, and a vertically arranged first hydraulic cylinder 106 is fixedly installed in the mounting plate 105, a lifting plate 107 is fixedly installed on the telescopic end of the first hydraulic cylinder 106, a vertical plate 110 is symmetrically provided on the upper surface of the lifting plate 107, and a pressure rod 111 is rotatably provided on the top of the vertical plate 110, a bending port 108 is provided on the upper surface of the testing platform 102 for the pressure rod 111 to pass through, and the testing platform A limiting frame 109 is also fixedly installed on the lower surface of 102, and the vertical plate 110 passes through the limiting frame 109, and also includes: a bending mechanism, which is fixedly arranged in the mounting cover 103, and is used to cause the metal sheet to bend when the upwardly moving metal sheet contacts the bending mechanism and detect the bending force exerted on the metal sheet; a supporting mechanism, which is arranged on the upper surface of the lifting plate 107, and is used to clamp the metal sheet between the bending mechanism and the supporting mechanism when the lifting plate 107 moves upward; a restoring mechanism, which is arranged in the mounting cover 103, and is used to restore the bent metal sheet; a limiting mechanism, which is arranged above the mounting plate 105, and is used to automatically apply a downward supporting force to both sides of the metal sheet when the lifting plate 107 moves upward.

[0021] The metal sheet sample to be tested can be placed on the surface of the testing table 102 through the take-out port 104 on one side of the mounting cover 103. During the test, the lifting plate 107 is driven upward by the first hydraulic cylinder 106. During the upward movement of the lifting plate 107, the limiting mechanism is first triggered to form precise limits on the left and right sides of the metal sheet. As the lifting plate 107 continues to move upward, the supporting mechanism on its surface passes through the testing table 102 and steadily lifts the metal sheet on the table. Since the limiting mechanism has fixed the left and right positions of the sheet at this time, the sheet can always maintain a horizontal state and move upward synchronously during the supporting process until it is firmly clamped between the supporting mechanism and the bending mechanism. When the lifting plate 107 moves further upward, the vertical plate 11 0 The pressure rod 111 at the top uses the bending mechanism as a fulcrum to apply pressure to both sides of the metal plate, causing the plate to gradually bend with the bending mechanism as the center. During the bending process, the bending mechanism records the bending force applied to the plate in real time. At the same time, the real-time bending angle of the plate can be accurately calculated based on the upward movement of the pressure rod 111, and then the dynamic relationship between the bending force and the bending angle can be obtained to judge the strength performance of the metal plate. After the metal plate is bent, it can be reset by the recovery mechanism. After reset, its fatigue resistance can be judged by observing the crease state on the surface of the plate. The entire detection process is coherent and efficient, which can not only accurately obtain strength data, but also comprehensively evaluate the fatigue resistance, and the use effect is significant.

[0022] As an embodiment of the present invention, please refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6 The bending mechanism includes a horizontal plate 301 fixedly installed in the mounting cover 103, a vertically arranged movable column 302 movably installed in the horizontal plate 301, a baffle 303 fixedly installed on the top of the movable column 302, and a baffle 304 fixedly installed on the bottom of the movable column 302, a pressure sensor 305 is provided between the horizontal plate 301 and the baffle 304, the cross-section of the baffle 304 is semicircular, and the arc surface is facing downward. When the metal sheet to be tested contacts the bottom of the baffle 304, the pressure rod 111 applies an upward resistance force to the metal sheet, and the sheet will naturally bend along the arc surface below the baffle 304. In this process, the pressure sensor 305 between the baffle 304 and the horizontal plate 301 will synchronously capture the force transmitted by the metal sheet, accurately detect the resistance force exerted on the sheet, thereby realizing real-time monitoring of the bending force.

[0023] As an embodiment of the present invention, please refer to Figure 7 、 Figure 9 and Figure 10The supporting mechanism includes a supporting rod 201 that passes through the mounting plate 105 and the lifting plate 107. A supporting piece 202 is symmetrically installed on the top of the supporting rod 201. A bottom plate 204 is fixedly installed on the bottom end of the supporting rod 201, and the bottom plate 204 and the lifting plate 107 are connected by a first spring 205. A supporting opening 203 for the supporting rod 201 to pass through is opened on the upper surface of the detection platform 102. When the lifting plate 107 moves up, the supporting piece 202 at the top of the supporting rod 201 will rise along the supporting opening 203 to the top of the detection platform 102, pushing the metal plate upward until the plate is firmly clamped between the blocking bar 304 and the supporting piece 203. 02, the push rod 201 is limited by the blocking bar 304 and cannot move further upward. At this time, the lifting plate 107 continues to move upward, which will gradually stretch the first spring 205 between the lifting plate 107 and the bottom plate 204. With the help of this elastic design, it will not hinder the subsequent movement of the lifting plate 107, and the tension of the first spring 205 can keep the push piece 202 stably clamping the plate. As the lifting plate 107 moves further upward, when the pressure rod 111 contacts the surface of the metal plate, the continuous lifting force of the lifting plate 107 can be used to drive the pressure rod 111 to apply force to the plate to complete the bending operation.

[0024] As an embodiment of the present invention, please refer to Figure 1 、 Figure 2 and Figure 3 The restoration mechanism includes a second hydraulic cylinder 401 fixedly installed in the mounting cover 103, and a downward plate 402 is fixedly installed on the telescopic end of the second hydraulic cylinder 401, and support rods 403 distributed at equal distances are symmetrically installed on the lower surface of the downward plate 402, and a restoration rod 404 is fixedly installed on the end of the support rod 403. When the bent metal sheet needs to be restored, the lifting plate 107 is first driven downward by the first hydraulic cylinder 106 to disengage the pressure rod 111 from contact with the metal sheet. At this time, under the pulling force of the first spring 205, the retaining plate 202 still maintains the retaining force on the metal sheet, ensuring that the sheet is always stably restricted between the retaining plate 202 and the retaining bar 304 to avoid displacement, and then the second hydraulic cylinder 401 drives the lower plate 402 to move downward, driving the restoring rod 404 at the end of the support rod 403 to gradually approach and contact both sides of the metal plate. Since the top of the support piece 202 is semicircular, it can provide stable support for the metal plate. When the restoring rod 404 applies a downward holding force to the plate, it can drive the metal plate and the support rod 201 to move downward synchronously and smoothly. When the metal plate moves down to contact the surface of the inspection table 102, the restoring rod 404 continues to move downward, and with the help of continuous pressure, the bent plate is gradually pushed back to a straight state to complete the restoration operation. The whole process does not require manual intervention, the operation is convenient and the restoration effect is stable.

[0025] As an embodiment of the present invention, please refer to Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10 The limiting mechanism includes a mounting frame 504 fixedly arranged on the lower surface of the detection platform 102, and a vertically arranged movable cylinder 505 is installed through the mounting frame 504, and the movable cylinder 505 and the mounting frame 504 are movably connected, the top of the movable cylinder 505 passes through the detection platform 102, and a telescopic rod 506 is connected to the movable cylinder 505 through a second spring 508, and a limiting strip 507 located above the detection platform 102 is fixedly installed on the top of the telescopic rod 506, and the lower side of the limiting strip 507 is provided with an oblique chamfer for supporting the side of the metal plate to be detected, and the outer wall of the movable cylinder 505 is also fixedly installed with a fixed plate 509, and the lower surface of the fixed plate 509 is fixedly installed A limiting rod 510 is installed, which passes through the mounting bracket 504, and a baffle 512 is fixedly installed at the bottom end of the limiting rod 510. A third spring 511 is sleeved on the outer side of the limiting rod 510, and the two ends of the third spring 511 are respectively connected to the mounting bracket 504 and the baffle 512. The bottom end of the movable cylinder 505 is connected to the mounting piece 514 through the fourth spring 513, and the bottom end of the mounting piece 514 is fixedly installed with a traction rope 503, and the other end of the traction rope 503 is connected to the lower surface of the lifting plate 107. A fixed shaft 501 is also fixedly installed in the cabinet 101, and a fixed pulley 502 is rotatably installed on the outer side of the fixed shaft 501. The traction rope 503 is sleeved on the fixed pulley When the lifting plate 107 rises on the outside of the pulley 502, the movable cylinder 505 will be pulled downward by the pulling force of the traction rope 503 and the fourth spring 513, which will drive the fixed plate 509 on the outside of the movable cylinder 505 to move downward synchronously, so that the third spring 511 on the outside of the limiting rod 510 will be gradually stretched. When the beveled corner on the lower side of the limiting bar 507 contacts and abuts the side of the metal plate to be detected, the movable cylinder 505 continues to move downward, which will prompt the telescopic rod 506 to retract into the movable cylinder 505, and the second spring 508 at its bottom will be stretched accordingly. In this process, the elastic force of the second spring 508 will push the limiting bar 507 to apply a downward abutting force to the side of the metal plate, ensuring that the side of the plate The edges are firmly limited. When the supporting mechanism pushes the metal plate upward, the continuous support of the limit bar 507 can ensure that the metal plate moves upward stably and horizontally, effectively preventing the plate from slipping during the upward movement and affecting the subsequent bending operation. When the metal plate begins to bend, its side will push the limit bar 507 upward, causing it to rise slightly. As the plate continues to bend, the side will naturally slide along the chamfer of the limit bar 507, thereby completely avoiding the obstruction of the limit bar 507 and ensuring that the bending process proceeds smoothly. This design uses the logic of "pre-tightening, dynamic adaptation, and automatic avoidance" to ensure the stability of the plate when it moves upward without interfering with the bending action, and the use effect is more reliable.

[0026] As an embodiment of the present invention, please refer to Figure 10 The upper surface of the inspection table 102 is also provided with a storage groove 601 that cooperates with the limit bar 507, and when the limit bar 507 is stored in the storage groove 601, the top of the limit bar 507 is lower than the notch of the storage groove 601. When the restoration mechanism performs a restoration operation on the metal plate, the side of the plate will contact the upper surface of the limit bar 507. As the restoration process progresses, the plate gradually stretches, and its side will naturally press the limit bar 507 into the storage groove 601. This design allows the limit bar 507 to automatically avoid during the restoration stage, completely eliminating the obstruction to the plate restoration action, ensuring a smooth and efficient restoration process.

[0027] As an embodiment of the present invention, please refer to Figure 9 and Figure 10 The retaining plate 702 is fixedly installed in the storage groove 601 away from the loading and unloading port 104, and the outer wall of the limit bar 507 corresponding to the upper portion of the retaining plate 702 is provided with a notch 701 that matches the retaining plate 702. When placing the metal sheet sample, the sheet can be continuously pushed into the mounting cover 103 until it is blocked by the retaining plate 702. This design can quickly locate the initial position of the sheet, ensuring that the reference for each placement is consistent. When the limit bar 507 moves downward and enters the storage groove 601, the retaining plate 702 will pass directly through the notch 701 on one side of the limit bar 507, and the two do not interfere with each other. This structural design cleverly avoids the movement conflict between components, does not affect the downward movement of the limit bar 507, and can ensure that the retaining plate 702 always plays a positioning role, making it more reliable to use.

[0028] It should be noted that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A metal plate strength testing device, comprising a cabinet, a testing platform provided on the upper surface of the cabinet, and a mounting cover fixedly provided on the upper surface of the testing platform, wherein a take-out opening is provided on one side of the mounting cover, characterized in that: The cabinet is fixedly provided with a mounting plate, and a vertically arranged first hydraulic cylinder is fixedly installed in the mounting plate, a lifting plate is fixedly installed on the telescopic end of the first hydraulic cylinder, a vertical plate is symmetrically provided on the upper surface of the lifting plate, and a pressure rod is rotatably provided on the top of the vertical plate, a bending opening for the pressure rod to pass through is opened on the upper surface of the testing platform, a limit frame is also fixedly installed on the lower surface of the testing platform, and the vertical plate passes through the limit frame, and further comprises: A bending mechanism, which is fixedly disposed in the mounting cover and is used to cause the metal sheet to bend when the upwardly moving metal sheet contacts the bending mechanism and to detect the bending force exerted on the metal sheet; A holding mechanism, which is provided on the upper surface of the lifting plate and is used to clamp the metal sheet between the bending mechanism and the holding mechanism when the lifting plate moves upward; A restoring mechanism, the restoring mechanism being arranged in the mounting cover and being used for restoring the bent metal sheet; The limiting mechanism is arranged above the mounting plate and is used to automatically apply a downward holding force to both sides of the metal plate when the lifting plate moves upward.

2. The metal sheet strength testing device according to claim 1, characterized in that: The bending mechanism includes a horizontal plate fixedly installed in the mounting cover, a vertically arranged movable column movably installed in the horizontal plate, a baffle fixedly installed on the top end of the movable column, and a baffle fixedly installed on the bottom end of the movable column, a pressure sensor is arranged between the horizontal plate and the baffle, and the cross-section of the baffle is semicircular, with the arc surface facing downward.

3. The metal sheet strength testing device according to claim 2, characterized in that: The supporting mechanism includes a supporting rod passing through the mounting plate and the lifting plate, a supporting plate is symmetrically installed on the top of the supporting rod, a bottom plate is fixedly installed on the bottom end of the supporting rod, and the bottom plate and the lifting plate are connected by a first spring, and a supporting opening is opened on the upper surface of the detection platform for the supporting rod to pass through.

4. The metal sheet strength testing device according to claim 3, characterized in that: The restoration mechanism includes a second hydraulic cylinder fixedly installed in the mounting cover, and a downward plate is fixedly installed on the telescopic end of the second hydraulic cylinder, and support rods symmetrically installed at equal distances on the lower surface of the downward plate, and restoration rods are fixedly installed on the ends of the support rods.

5. The metal sheet strength testing device according to claim 1, characterized in that: The limiting mechanism includes a mounting bracket fixedly arranged on the lower surface of the detection platform, and a vertically arranged movable cylinder is installed through the mounting bracket, and the movable cylinder and the mounting bracket are movably connected, the top end of the movable cylinder passes through the detection platform, the movable cylinder is connected with a telescopic rod through a second spring, and the top end of the telescopic rod is fixedly installed with a limiting strip located above the detection platform, and the lower side edge of the limiting strip is provided with an oblique chamfer for supporting the side edge of the metal plate to be detected, the outer wall of the movable cylinder is also fixedly installed with a fixed plate, and the lower surface of the fixed plate is fixed A limit rod is installed, which passes through the mounting bracket, and a baffle is fixedly installed on the bottom end of the limit rod. A third spring is sleeved on the outer side of the limit rod, and the two ends of the third spring are respectively connected to the mounting bracket and the baffle. The bottom end of the movable cylinder is connected to the mounting plate through a fourth spring, and a traction rope is fixedly installed on the bottom end of the mounting plate, and the other end of the traction rope is connected to the lower surface of the lifting plate. A fixed shaft is also fixedly installed in the cabinet body, and a fixed pulley is rotatably installed on the outer side of the fixed shaft, and the traction rope is sleeved on the outer side of the fixed pulley.

6. The metal sheet strength testing device according to claim 5, characterized in that: The upper surface of the detection platform is further provided with a receiving groove matched with the limiting strip, and when the limiting strip is received in the receiving groove, the top end of the limiting strip is lower than the notch of the receiving groove.

7. The metal sheet strength testing device according to claim 6, characterized in that: A blocking piece is fixedly installed in the receiving groove away from the taking and placing port, and a notch that matches the blocking piece is opened on the outer wall of one side of the limiting strip corresponding to the blocking piece.

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