A metal sheet strength detection device

Abstract

This invention relates to the field of sheet metal testing technology, and more particularly to a metal sheet strength testing device, comprising a cabinet, a testing platform on the upper surface of the cabinet, and a mounting cover fixedly mounted on the upper surface of the testing platform. A pick-and-place opening is provided on one side of the mounting cover. A mounting plate is fixedly mounted inside the cabinet, and a vertically mounted first hydraulic cylinder is fixedly mounted in the mounting plate. A lifting plate is fixedly mounted on the telescopic end of the first hydraulic cylinder. Vertical plates are symmetrically arranged on the upper surface of the lifting plate, and a pressure rod is rotatably mounted on the top of the vertical plates. A bending opening is provided on the upper surface of the testing platform for the pressure rod to pass through. The testing device of this invention allows for convenient placement of sheet metal, ensures stable testing through limiting and clamping, accurately records bending data to determine strength, and allows the metal sheet to be reset for easy observation of creases to assess fatigue resistance, significantly improving the device's usability and the comprehensiveness of the testing.

Description

Technical Field

[0001] This invention relates to the field of sheet metal testing technology, and more particularly to a metal sheet strength testing device. Background Technology

[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 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, making it difficult to meet the needs of efficient and accurate testing.

[0003] Traditional testing equipment has significant shortcomings in the plate positioning stage, lacking reliable limiting and leveling mechanisms. After the metal plate is placed on the testing table, it is prone to displacement and tilting due to external interference or equipment vibration, directly affecting the bending process. Furthermore, during the bending test, existing equipment has low precision in controlling force and angle. Most equipment cannot record the dynamic relationship between bending force and corresponding angle in real time and accurately, and can only obtain results through experience or rough measurement, making it difficult to establish a scientific basis for strength assessment. In addition, existing equipment has shortcomings in fatigue performance assessment. The bent plate is often difficult to return to its original position smoothly, and secondary damage is easily generated during the return process, making it impossible to accurately observe the crease condition.

[0004] Meanwhile, the traditional testing process suffers from poor coordination between its various stages. Operations such as positioning, clamping, bending, and resetting require frequent manual intervention, which not only increases operational complexity but also reduces testing efficiency, making it difficult to meet the needs of batch testing. Therefore, there is an urgent need to design a metal sheet strength testing device to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a metal sheet strength testing device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A metal sheet strength testing device includes a cabinet, a testing platform on the upper surface of the cabinet, and a mounting cover fixedly mounted on the upper surface of the testing platform. A pick-and-place opening is provided on one side of the mounting cover. A mounting plate is fixedly mounted inside the cabinet, and a vertically mounted first hydraulic cylinder is fixedly mounted in the mounting plate. A lifting plate is fixedly mounted on the telescopic end of the first hydraulic cylinder. Vertical plates are symmetrically arranged on the upper surface of the lifting plate, and a pressure rod is rotatably mounted on the top of each vertical plate. A bend opening is provided on the upper surface of the testing platform for the pressure rod to pass through. A limit frame is also fixedly mounted on the lower surface of the testing platform, and the vertical plate passes through the limit frame. The device further includes:

[0008] A bending mechanism is fixedly installed in the mounting cover. When the upward-moving metal plate comes into contact with the bending mechanism, it causes the metal plate to bend and detects the bending force on the metal plate.

[0009] A holding mechanism is provided on the upper surface of the lifting plate and is used to clamp the metal plate between the bending mechanism and the holding mechanism when the lifting plate moves upward.

[0010] A restoration mechanism, which is disposed in the mounting cover, is used to restore the bent metal sheet;

[0011] A limiting mechanism is provided above the mounting plate to automatically apply a downward supporting force to both sides of the metal plate when the lifting plate moves upward.

[0012] As a further embodiment of the present invention: the bending mechanism includes a horizontal plate fixedly installed in the mounting cover, a vertically arranged movable column is movably installed in the horizontal plate, a baffle is fixedly installed at the top of the movable column, and a baffle strip is fixedly installed at the bottom of the movable column. A pressure sensor is arranged between the horizontal plate and the baffle strip. The cross-section of the baffle strip is semi-circular, and the arc surface faces downward.

[0013] As a further embodiment of the present invention: the supporting mechanism includes a supporting rod that penetrates the mounting plate and the lifting plate, the top end of the supporting rod is symmetrically equipped with a supporting piece, the bottom end of the supporting rod is fixedly installed with a base plate, and the base plate and the lifting plate are connected by a first spring, and the upper surface of the detection table is provided with a supporting opening for the supporting rod to pass through.

[0014] As a further embodiment of the present invention: the restoration mechanism includes a second hydraulic cylinder fixedly installed in the mounting cover, and a downward moving plate is fixedly installed at the telescopic end of the second hydraulic cylinder. Support rods are symmetrically installed at equal intervals on the lower surface of the downward moving plate, and restoration rods are fixedly installed at the ends of the support rods.

[0015] As a further embodiment of the present invention: the limiting mechanism includes a mounting frame fixedly disposed on the lower surface of the testing platform, and a vertically arranged movable cylinder is installed through the mounting frame, and the movable cylinder and the mounting frame are movably connected. The top end of the movable cylinder passes through the testing platform, and a telescopic rod is connected to the movable cylinder through a second spring. A limiting strip located above the testing platform is fixedly installed at the top end of the telescopic rod, and the lower side of the limiting strip has a chamfered edge for abutting against the side of the metal plate to be tested. A fixing plate is also fixedly installed on the outer wall of the movable cylinder, and the fixing plate... A limiting rod is fixedly installed on the lower surface of the device, the limiting rod passes through the mounting frame, and a baffle is fixedly installed at the bottom end of the limiting rod. A third spring is sleeved on the outer side of the limiting rod, and the two ends of the third spring are respectively connected to the mounting frame and the baffle. The bottom end of the movable cylinder is connected to a mounting plate through a fourth spring, and a traction rope is fixedly installed at the bottom end of the mounting plate. 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, and a fixed pulley is rotatably installed on the outer side of the fixed shaft. The traction rope is sleeved on the outer side of the fixed pulley.

[0016] As a further embodiment of the present invention: the upper surface of the detection platform is also provided with a storage groove that cooperates with the limiting strip, and when the limiting strip is stored in the storage groove, the top of the limiting strip is lower than the opening of the storage groove.

[0017] As a further embodiment of the present invention: a baffle plate is fixedly installed in the storage groove away from the loading and unloading port, and a notch is opened on the outer wall of the limiting strip on the side above the baffle plate to cooperate with the baffle plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The present invention provides a metal sheet strength testing device. The metal sheet sample to be tested can be easily placed on the surface of the testing table through the pick-and-place port on one side of the mounting cover. The operation is convenient. During the test, the first hydraulic cylinder drives the lifting plate to move up. In the process, the limiting mechanism is triggered first to form a precise limit on the left and right sides of the metal sheet. This operation fixes the left and right position of the sheet, providing a stable foundation for subsequent testing steps and avoiding the impact of sheet displacement on the testing accuracy.

[0020] As the lifting plate continues to move upward, the supporting mechanism on its surface passes through the testing table and steadily lifts the metal plate on the table. Since the limiting mechanism has fixed the left and right positions of the plate, the plate 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 plate will not shake or shift during the subsequent bending test, ensuring the reliability of the testing process.

[0021] As the lifting plate moves further upward, the pressure bar at the top of the plate applies pressure to both sides of the metal sheet with the bending mechanism as the fulcrum, causing the sheet to gradually bend around the bending mechanism. During the bending process, the bending mechanism records the bending force in real time and accurately calculates the real-time bending angle based on the upward movement of the pressure bar, thus obtaining the dynamic relationship between the two. This allows for a precise assessment of the strength performance of the metal sheet, providing accurate data support for the evaluation.

[0022] After the metal sheet is bent, it can be reset by the restoration mechanism. After reset, the state of the creases on the surface of the sheet can be observed to determine its fatigue resistance. The entire testing process is coherent and efficient, which can accurately obtain strength data and comprehensively evaluate fatigue resistance, greatly improving the use effect of the equipment and the comprehensiveness of the test. Attached Figure Description

[0023] Figure 1 This is a first-view structural schematic diagram of a metal sheet strength testing device provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of a metal sheet strength testing device provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of a half-section structure of a metal sheet strength testing device provided in an embodiment of the present invention;

[0026] Figure 4 for Figure 3 Enlarged structural diagram at point A in the diagram;

[0027] Figure 5 This is a first-view structural diagram of the mounting plate and lifting plate in a metal sheet strength testing device provided in an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the bending mechanism in a metal sheet strength testing device provided in an embodiment of the present invention;

[0029] Figure 7 This is a second-view structural diagram of the mounting plate and lifting plate in a metal sheet strength testing device provided in an embodiment of the present invention;

[0030] Figure 8 for Figure 7 Enlarged structural diagram at point B in the diagram;

[0031] Figure 9 This is a third-view structural diagram of the mounting plate and lifting plate in a metal sheet strength testing device provided in an embodiment of the present invention;

[0032] Figure 10This is a schematic diagram of the structure of the testing table in a metal sheet strength testing device provided in an embodiment of the present invention;

[0033] Figure 11 This is a second-view structural schematic diagram of a metal sheet strength testing device provided in an embodiment of the present invention.

[0034] In the diagram: 101-Cabinet, 102-Testing table, 103-Mounting cover, 104-Pick-up / drop-off port, 105-Mounting plate, 106-First hydraulic cylinder, 107-Lifting plate, 108-Bending port, 109-Limiting frame, 110-Upright plate, 111-Pressure rod, 201-Abutting rod, 202-Abutting piece, 203-Abutting port, 204-Base plate, 205-First spring, 301-Horizontal plate, 302-Moving column, 303-Baffle plate, 304-Baffle strip, 305-Pressure sensor, 4 01-Second hydraulic cylinder, 402-Lowering plate, 403-Support rod, 404-Restoring rod, 501-Fixed shaft, 502-Fixed pulley, 503-Traction rope, 504-Mounting bracket, 505-Moving cylinder, 506-Telescopic rod, 507-Limiting strip, 508-Second spring, 509-Fixed disc, 510-Limiting rod, 511-Third spring, 512-Baffle, 513-Fourth spring, 514-Mounting piece, 601-Receiving slot, 701-Notch, 702-Blocking piece. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] like Figures 1-11As shown, an embodiment of the present invention provides a metal sheet strength testing device, including 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-and-place opening 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 at the telescopic end of the first hydraulic cylinder 106. Vertical plates 110 are symmetrically arranged on the upper surface of the lifting plate 107, and a pressure rod 111 is rotatably provided at the top of the vertical plate 110. A bending opening 108 for the pressure rod 111 to pass through is provided on the upper surface of the testing platform 102. The lower surface of 102 is also fixedly installed with a limiting frame 109, and the upright plate 110 passes through the limiting frame 109. It also includes: a bending mechanism, which is fixedly installed in the mounting cover 103, used to cause the metal plate to bend when it comes into contact with the bending mechanism and to detect the bending force on the metal plate; a supporting mechanism, which is installed on the upper surface of the lifting plate 107, used to clamp the metal plate between the bending mechanism and the supporting mechanism when the lifting plate 107 moves upward; a restoring mechanism, which is installed in the mounting cover 103, used to restore the bent metal plate; and a limiting mechanism, which is installed above the mounting plate 105, used to automatically apply a downward supporting force to both sides of the metal plate when the lifting plate 107 moves upward.

[0037] The metal sheet sample to be tested can be placed on the surface of the testing table 102 through the pick-and-place port 104 on one side of the mounting cover 103. During testing, the lifting plate 107 is driven to move 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 remain horizontal 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 upward further, the upright plate 11 The pressure rod 111 at the top of the plate applies pressure to both sides of the metal sheet using the bending mechanism as a fulcrum, causing the sheet to gradually bend around the bending mechanism. During the bending process, the bending mechanism records the bending force applied to the sheet in real time. At the same time, the real-time bending angle of the sheet can be accurately calculated based on the upward movement of the pressure rod 111, thus obtaining the dynamic relationship between the bending force and the bending angle. This allows for the assessment of the strength performance of the metal sheet. After the metal sheet is bent, it can be reset by the restoration mechanism. After reset, the fatigue resistance can be determined by observing the crease state on the surface of the sheet. The entire testing process is coherent and efficient, accurately acquiring strength data and comprehensively evaluating fatigue resistance, resulting in significant effectiveness.

[0038] As one 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 is movably installed in the horizontal plate 301. A baffle 303 is fixedly installed at the top of the movable column 302, and a baffle 304 is fixedly installed at the bottom of the movable column 302. A pressure sensor 305 is arranged between the horizontal plate 301 and the baffle 304. The cross-section of the baffle 304 is semi-circular, and the arc surface faces downward. When the metal plate to be tested contacts the bottom of the baffle 304, the pressure rod 111 applies an upward holding force to the metal plate, and the plate will naturally bend along the arc surface below the baffle 304. During this process, the pressure sensor 305 between the baffle 304 and the horizontal plate 301 will simultaneously capture the force transmitted by the metal plate and accurately detect the holding force on the plate, thereby realizing real-time monitoring of the bending force.

[0039] As one embodiment of the present invention, please refer to Figure 7 , Figure 9 and Figure 10 The supporting mechanism includes a support rod 201 that penetrates the mounting plate 105 and the lifting plate 107. Abutment pieces 202 are symmetrically mounted on the top of the support rod 201, and a base plate 204 is fixedly mounted on the bottom of the support rod 201. The base plate 204 and the lifting plate 107 are connected by a first spring 205. The upper surface of the testing table 102 has a supporting opening 203 for the support rod 201 to pass through. When the lifting plate 107 moves upward, the abutment pieces 202 at the top of the support rod 201 rise along the supporting opening 203 above the testing table 102, pushing the metal plate upward until the plate is firmly clamped between the stop bar 304 and the abutment pieces 202. When the distance is between 0 and 2, the abutment 201 cannot move further upward due to the limit of the stop bar 304. 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 base 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 maintain the stable clamping of the abutment 202 on 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 drive the pressure rod 111 to apply force to the plate, and complete the bending operation.

[0040] As one embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 3The restoration mechanism includes a second hydraulic cylinder 401 fixedly installed in the mounting cover 103, and a lowering plate 402 is fixedly installed at the telescopic end of the second hydraulic cylinder 401. Support rods 403 are symmetrically and evenly distributed on the lower surface of the lowering plate 402, and restoration rods 404 are fixedly installed at the ends of the support rods 403. When it is necessary to restore the bent metal sheet, the lifting plate 107 is first moved down by the first hydraulic cylinder 106, so that the pressure rod 111 is disengaged from the metal sheet. At this time, under the tension of the first spring 205, the abutment 202 still maintains the holding force on the metal sheet, ensuring that the sheet is always stably restricted between the abutment 202 and the stop bar. Between 304, to avoid displacement, the second hydraulic cylinder 401 drives the lower plate 402 to move down, causing the restoration 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 abutment 202 is semi-circular, it can provide stable support for the metal plate. When the restoration rod 404 applies a downward holding force to the plate, it can drive the metal plate and the abutment 201 to move down smoothly and synchronously. When the metal plate moves down to contact the surface of the testing table 102, the restoration rod 404 continues to move down, and with the help of continuous pressure, it gradually pushes the bent plate back to a straight state, completing the restoration operation. The whole process does not require manual intervention, is convenient to operate, and has a stable restoration effect.

[0041] As one embodiment of the present invention, please refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 9 and Figure 10The limiting mechanism includes a mounting bracket 504 fixedly mounted on the lower surface of the testing table 102, through which a vertically arranged movable cylinder 505 is installed, and the movable cylinder 505 and the mounting bracket 504 are movably connected. The top end of the movable cylinder 505 passes through the testing table 102, and a telescopic rod 506 is connected to the movable cylinder 505 via a second spring 508. A limiting strip 507 located above the testing table 102 is fixedly mounted on the top end of the telescopic rod 506, and the lower side of the limiting strip 507 has a chamfered edge for abutting the side of the metal plate to be tested. A fixing plate 509 is also fixedly mounted on the outer wall of the movable cylinder 505, and the lower surface of the fixing plate 509 is fixedly mounted with a fixed plate. A limit rod 510 is installed, which passes through the mounting frame 504. A baffle 512 is fixedly installed at the bottom end of the limit rod 510. A third spring 511 is sleeved on the outside of the limit rod 510, and both ends of the third spring 511 are connected to the mounting frame 504 and the baffle 512, respectively. The bottom end of the movable cylinder 505 is connected to a mounting plate 514 through a fourth spring 513. A traction rope 503 is fixedly installed at the bottom end of the mounting plate 514. 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 outside of the fixed shaft 501. The traction rope 503 is sleeved on the fixed shaft 501. When the lifting plate 107 rises, it first pulls the movable cylinder 505 downwards via the traction rope 503 and the pulling force of the fourth spring 513. This causes the fixed plate 509 on the outside of the movable cylinder 505 to move downwards simultaneously, gradually stretching the third spring 511 on the outside of the limiting rod 510. When the chamfer on the lower side of the limiting bar 507 contacts and abuts against the side of the metal plate to be tested, the movable cylinder 505 continues to move downwards, causing the telescopic rod 506 to retract into the movable cylinder 505. The second spring 508 at its bottom is then stretched. During this process, the elastic force of the second spring 508 pushes the limiting bar 507 to apply a downward abutting force to the side of the metal plate, ensuring that the side of the plate is held in place. With the edge firmly restrained, when the supporting mechanism lifts the metal sheet upwards, the continuous restraint of the limiting strip 507 ensures that the metal sheet moves steadily and horizontally upwards, effectively preventing the sheet from slipping during the upward movement and affecting subsequent bending operations. When the metal sheet begins to bend, its side will push the limiting strip 507 upwards, causing it to rise slightly. As the sheet continues to bend, the side will naturally slide along the chamfer of the limiting strip 507, thus completely avoiding the obstruction of the limiting strip 507 and ensuring that the bending process proceeds smoothly. This design, through the logic of "pre-tightening restraint, dynamic adaptation, and automatic avoidance," not only ensures the stability of the sheet during upward movement but also does not interfere with the bending action, making the performance more reliable.

[0042] As one embodiment of the present invention, please refer to Figure 10The upper surface of the testing table 102 is also provided with a storage groove 601 that cooperates with the limiting strip 507. When the limiting strip 507 is stored in the storage groove 601, the top of the limiting strip 507 is lower than the opening of the storage groove 601. When the restoration mechanism performs the restoration operation on the metal plate, the side of the plate will contact the upper surface of the limiting strip 507. As the restoration process progresses, the plate gradually stretches out, and its side will naturally press the limiting strip 507 into the storage groove 601. This design allows the limiting strip 507 to automatically avoid obstacles during the restoration stage, completely eliminating the obstruction to the restoration action of the plate and ensuring a smooth and efficient restoration process.

[0043] As one embodiment of the present invention, please refer to Figure 9 and Figure 10 A baffle plate 702 is fixedly installed in the storage slot 601 away from the loading and unloading port 104. The outer wall of the limiting strip 507 above the baffle plate 702 has a notch 701 that matches the baffle plate 702. When placing a metal plate sample, the plate can be continuously pushed into the mounting cover 103 until it is blocked by the baffle plate 702. This design can quickly locate the initial position of the plate and ensure that the reference is consistent each time it is placed. When the limiting strip 507 moves downward and enters the storage slot 601, the baffle plate 702 will pass directly through the notch 701 on the side of the limiting strip 507 without interfering with each other. This structural design cleverly avoids the movement conflict between the components. It does not affect the downward movement of the limiting strip 507 and ensures that the baffle plate 702 always plays a positioning role, making it more reliable.

[0044] It should be noted that although this specification describes the embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for 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 embodiments that can be understood by those skilled in the art.

Claims

1. A metal sheet strength testing device, comprising a cabinet, a testing platform disposed on the upper surface of the cabinet, and a mounting cover fixedly disposed on the upper surface of the testing platform, wherein a pick-and-place opening is provided on one side of the mounting cover, characterized in that, A mounting plate is fixedly installed in the cabinet, and a vertically arranged first hydraulic cylinder is fixedly installed in the mounting plate. A lifting plate is fixedly installed at the telescopic end of the first hydraulic cylinder. Vertical plates are symmetrically arranged on the upper surface of the lifting plate, and a pressure rod is rotatably installed at the top of the vertical plate. A bend opening is opened on the upper surface of the testing table for the pressure rod to pass through. A limit frame is also fixedly installed on the lower surface of the testing table, and the vertical plate passes through the limit frame. The cabinet also includes: A bending mechanism is fixedly installed in the mounting cover. It is used to cause the metal plate to bend when the lifting plate moves the metal plate upward and comes into contact with the bending mechanism, and to detect the bending force on the metal plate. 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 plate fixedly installed at the top of the movable column, and a baffle strip fixedly installed at the bottom of the movable column. A pressure sensor is arranged between the horizontal plate and the baffle strip. The cross-section of the baffle strip is semi-circular, and the arc surface faces downward. A holding mechanism is provided on the upper surface of the lifting plate and is used to clamp the metal plate between the bending mechanism and the holding mechanism when the lifting plate moves upward. The supporting mechanism includes a support rod that passes through the mounting plate and the lifting plate. The top end of the support rod is symmetrically equipped with a support piece, and the bottom end of the support rod is fixedly equipped with a base plate. The base plate and the lifting plate are connected by a first spring. The upper surface of the detection table is provided with a supporting opening for the support rod to pass through. A restoration mechanism, which is disposed in the mounting cover, is used to restore the bent metal sheet; The recovery 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. Support rods are symmetrically installed at equal intervals on the lower surface of the downward plate, and recovery rods are fixedly installed at the ends of the support rods. A limiting mechanism is provided above the mounting plate and is used to automatically apply a downward supporting force to both sides of the metal plate when the lifting plate moves upward. The limiting mechanism includes a mounting frame fixedly installed on the lower surface of the testing platform, through which a vertically arranged movable cylinder is installed. The movable cylinder and the mounting frame are movably connected. The top end of the movable cylinder passes through the testing platform. A telescopic rod is connected to the movable cylinder via a second spring. A limiting strip located above the testing platform is fixedly installed at the top end of the telescopic rod. The lower side of the limiting strip has a chamfered edge to abut against the side of the metal plate to be tested. A fixing plate is also fixedly installed on the outer wall of the movable cylinder, and a fixing plate is fixedly mounted on the lower surface of the fixing plate. A limit rod is installed, which passes through the mounting frame, and a baffle is fixedly installed at the bottom end of the limit rod. A third spring is sleeved on the outside of the limit rod, and the two ends of the third spring are respectively connected to the mounting frame and the baffle. The bottom end of the movable cylinder is connected to a mounting plate through a fourth spring, and a traction rope is fixedly installed at the bottom end of the mounting plate. 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, and a fixed pulley is rotatably installed on the outside of the fixed shaft. The traction rope is sleeved on the outside of the fixed pulley.

2. The metal sheet strength testing equipment according to claim 1, characterized in that, The upper surface of the testing station is also provided with a storage groove that cooperates with the limiting strip, and when the limiting strip is stored in the storage groove, the top of the limiting strip is lower than the opening of the storage groove.

3. The metal sheet strength testing equipment according to claim 2, characterized in that, A baffle plate is fixedly installed in the storage slot away from the loading and unloading port, and a notch is opened on the outer wall of the limiting strip above the baffle plate to cooperate with the baffle plate.

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