Elevator car strength detection device

Abstract

The invention relates to the technical field of elevator car detection, in particular to an elevator car strength detection device. The shell is internally provided with a slide way with an axis, and the slide way is located on the axis and provided with at least one opening; the sliding piece is arranged on the side, provided with the opening, of the sliding way and used for extruding or impacting the plate face of the elevator car; the magnetic part is arranged on the other side of the slide way and used for outputting forward acting force or reverse acting force to the sliding part; the forward acting force is used for the sliding part to extrude or impact the plate surface of the elevator car; and the pressure sensor is arranged on the sliding piece and is used for acquiring a force value when the sliding piece extrudes or collides with the plate surface of the elevator car in real time. According to the invention, in the same environment, a static loading effect can be provided, and a dynamic impact effect can also be provided, so that rapid switching of two detection modes is realized in the same detection device, and the detection efficiency and the operation convenience are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of elevator car testing technology, and more specifically, to an elevator car strength testing device. Background Technology

[0002] The elevator car is a box-shaped space used to carry and transport people and goods. The car generally consists of major components such as the car floor, car walls, car top, and car doors. It is the elevator body component used to transport passengers, goods, and other loads. Strength testing of the elevator car structure (car floor, car walls, car top, and car doors) is a crucial step in ensuring the safe operation of the elevator, mainly divided into two parts: car structural strength and suspension system strength. Testing methods for the car structure include static loading and impact testing.

[0003] Static loading refers to the slow and steady application of a fixed force or load to the elevator car structure and holding it for a period of time to measure the structure's response (such as deformation and strain) under that load. For example, Chinese Patent Publication No. CN103969070B discloses an elevator door deformation measuring instrument. In accordance with the new national standard for the compressive strength of elevator doors, a handle drives a screw to apply a rated thrust to push the standard top end against the elevator door, and a pressure sensor 21 detects the magnitude of the applied thrust, which is then displayed on a display device.

[0004] However, during measurement, the pressure at the top end of this measuring instrument is generated by the rotation of the screw, which is a slow process of doing work. The screw is rotated by the handle, converting rotational motion into linear propulsion of the top end. This process is extremely slow and cannot generate a sufficient instantaneous kinetic energy pulse with a combination of speed and mass. Even if the screw is suddenly rotated rapidly, the inertia of the transmission system, thread friction, and the inertia of the handle itself will "buffer" this process into an accelerating and then decelerating push, rather than a clean impact. Therefore, this measuring instrument is unsuitable for impact testing.

[0005] Impact testing is a dynamic mechanical performance test. It involves dropping or swinging an impactor (pendulum) of known mass and shape from a predetermined height, striking the elevator car's wall panels, door panels, or related components at high speed and instantaneous speed. Its purpose is to simulate accidental collisions that may occur during daily use and to evaluate the performance of the tested components under impact.

[0006] With current technology, it is impossible to simultaneously perform static loading and impact testing on the same measuring instrument, which limits the efficiency of the test, especially for the same location where it is difficult to quickly switch between static loading and impact testing. Summary of the Invention

[0007] The purpose of this invention is to provide an elevator car strength testing device to solve the problem of reduced testing efficiency and ease of operation caused by switching between two testing modes.

[0008] To achieve the above objectives, an elevator car strength testing device is provided, comprising: An outer casing having an internal slide rail with an axis, the slide rail having at least one opening on the axis; A sliding member is disposed on the side of the slide rail with an opening, for pressing or impacting the surface of the elevator car; A magnetic component is disposed on the other side of the slide rail and is used to output a positive or negative force to the sliding component; the positive force is used for the sliding component to press or impact the surface of the elevator car. as well as, A pressure sensor is installed on the sliding member to obtain the force value when the sliding member squeezes or impacts the elevator car panel in real time.

[0009] Specifically, it also includes: The first detection mode is based on the sliding member pressing against the surface of the elevator car. as well as, The second detection mode is based on the sliding member impacting the surface of the elevator car.

[0010] Furthermore, in both the first and second detection modes, the outer shell is in contact with the surface of the elevator car. The sliding member has fixed magnetism at the end near the magnetic member, and the magnetic member has variable magnetism; In the initial state, the slider is in contact with the magnetic component; there is a gap between the front end face of the slider and the front end face of the outer shell.

[0011] As one implementation of this technical solution, in the first detection mode, the outer shell is in contact with the surface of the elevator car; in the second detection mode, there is a gap between the outer shell and the surface of the elevator car. The end of the slider near the magnetic component has fixed magnetism, and the magnetic component has fixed magnetism; In the initial state, the front end face of the slider is flush with the front end face of the outer shell.

[0012] As another implementation of this technical solution, the slider includes: A contact element, which is oriented toward the opening, is used to press or impact the surface of the elevator car. as well as, A slider is disposed on the rear side of the contact; the slider has fixed magnetism; The pressure sensor is disposed between the contact and the slider; When the magnetic component is used to output a positive force, the slider and the magnetic component are like poles and repel each other.

[0013] As a further improvement to this technical solution, the outer shell includes a first shell and a second shell; the first shell is provided with a first sliding hole that runs through the front and back, and the second shell is provided with a second sliding hole that runs through the front and back, the first sliding hole and the second sliding hole together form a slide rail; The tail end of the second sliding hole accommodates a portion of the magnetic component; The first housing and the second housing are detachably connected.

[0014] In addition, a slot is provided outside the second sliding hole; a positioning plate is provided outside the sliding member, and the positioning plate is restricted to slide within the slot.

[0015] As another implementation of this technical solution, a slot is provided outside the slide rail; a positioning plate is provided outside the sliding member, and the positioning plate is restricted to slide within the slot; A locking plate is rotatably connected inside the slot, and the rotatable connection forms a fulcrum; a push rod is provided inside the slot, and the output end of the push rod acts on the rear side of the fulcrum; a spring is also provided on the rear side of the fulcrum of the locking plate, one end of the spring is fixedly connected to the slot, and the other end is fixedly connected to the outer wall of the locking plate. Under the combined action of the spring and the push rod, the locking plate can move away from or towards the positioning plate; The locking plate is positioned close to the positioning plate to lock the positioning plate; the locking plate is positioned away from the positioning plate to unlock the positioning plate.

[0016] Furthermore, a protective gap is reserved between the magnetic component and the sliding component; the magnetic component is used to output a positive force so that the locking plate engages with the positioning plate in the initial state.

[0017] Furthermore, when the sliding member bounces back after impacting the elevator car's panel, the magnetic component outputs a positive force to decelerate the sliding member.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this elevator car strength testing device, the magnetic component and the sliding component are set in the same channel. Utilizing the characteristic that the magnetic component can output controllable electromagnetic force, it can provide both a static loading effect and a dynamic impact effect under the same environment. Thus, it can realize the rapid switching between the two testing modes in the same testing device, which significantly improves the testing efficiency and the convenience of operation.

[0019] 2. The addition of a locking plate in this elevator car strength testing device results in improved specific operational performance. It allows the sliding element to be pre-locked in a position where the front face of the contact element is flush with the front face of the housing before static loading testing. This ensures that the contact element is already in contact with the test surface when the device is applied to it, allowing the magnetic element to pre-establish and stabilize the target pressure.

[0020] Moreover, after unlocking, the target pressure can be applied directly to the board surface instantly and without delay, eliminating the preparation stage of slow loading from zero in the traditional method. This not only shortens the test time but also significantly improves the starting accuracy and test consistency of static loading.

[0021] Meanwhile, this locking and preloading mechanism allows the slider to be released from a defined position closer to the plate during impact testing, thereby achieving efficient impact acceleration in a more compact space. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the strength detection device of the present invention; Figure 2 This is an exploded view of the strength testing device of the present invention; Figure 3 This is a schematic diagram showing the assembly state of the first and second housings of the present invention; Figure 4 This is an exploded view of the second and third housings of the present invention; Figure 5 This is one of the cross-sectional structural schematic diagrams of the strength testing device of the present invention; Figure 6 This is a second schematic diagram of the cross-sectional structure of the strength testing device of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of the structure at point D; Figure 8 This is the third cross-sectional structural schematic diagram of the strength testing device of the present invention; Figure 9 For the present invention Figure 8 Enlarged view of the structure at point E; Figure 10 This is the fourth cross-sectional structural schematic diagram of the strength testing device of the present invention; Figure 11 This is the fifth schematic diagram of the cross-sectional structure of the strength testing device of the present invention; Figure 12 This is a schematic diagram of one application scenario of the strength detection device of the present invention; Figure 13 The second schematic diagram shows the application scenario structure of the strength detection device of the present invention.

[0023] The meanings of the labels in the diagram are as follows: 1. Strength testing device; 2. Contact element; 3. Second housing; 4. Magnetic element; 5. Third housing; 6. Ring plate; 7. First sliding hole; 8. Connecting plate; 9. Insert block; 10. Test piece; 11. First housing; 21. Pressure sensor; 22. Slider; 23. Protective gap; 31. Slot; 32. Second sliding hole; 33. Receiving groove; 41. Receiving plate; 51. Outer edge; 52. Connecting ring; 53. Heat dissipation hole; 311. Locking plate; 312. Push rod; 313. Spring; 314. Rotating shaft; 315. Positioning plate. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Figure 1 The strength testing device 1 is shown. The strength testing device 1 is used to test the panel structure of the elevator car, such as the car bottom, car wall, car top, and car door. The strength testing device 1 uses the principle of like poles repulsion to provide a repulsive force so that the sliding part can both impact the panel and abut against the panel, thereby realizing the integration of static loading and impact testing.

[0026] First embodiment, Figure 2 The components of the strength detection device 1 are shown through an explosion. (See attached image) Figure 2 The strength testing device 1 includes a housing, a sliding member, and a magnetic member 4. The housing contains a slide rail with an axis. The sliding member is slidably mounted on one side of the slide rail, which has an opening. The magnetic member 4 is fixed to the other side of the slide rail, which may or may not have an opening. The magnetic member 4 provides a positive force (forward) or a negative force (backward) to the sliding member via electromagnetic force. Figure 2 For example: The axial direction of the slide is... Figure 2 In the x-axis, "front" in the figure refers to the side where the plate is located during the detection (similar terms such as "front", "front side", "front end", "head" in the following text all have this meaning). The head of the slider faces the front side of the slide, and the magnetic component 4 is set on the rear side of the slider, with openings on both sides.

[0027] See Figure 2The outer shell includes a first shell 11, a second shell 3, and a third shell 5. The first shell 11, the second shell 3, and the third shell 5 are all detachably connected, which facilitates the maintenance and replacement of the internal components of each shell, such as sliding parts, magnetic parts, etc. (some other parts are shown below). Figure 3 The assembly state of the first housing 11 and the second housing 3 is shown. See [link / reference]. Figure 2 and Figure 3 As shown, a first sliding hole 7 is provided in the first housing 11, and a second sliding hole 32 is provided in the second housing 3, which together form a slide.

[0028] Figure 4 The assembly state of the second housing 3, the magnetic component 4, and the third housing 5 is shown, and Figure 4 The viewpoint is primarily from the rear side of the second shell 3. (See attached image) Figure 4 The tail end of the second sliding hole 32 accommodates the magnetic component 4, so that after the third housing 5 is removed, the remaining part of the magnetic component 4 is exposed, making it easy to pull the magnetic component 4 out of the second sliding hole 32 and also easy to insert it into the second sliding hole 32, depending on whether it is for installation or disassembly. In addition, in order to improve the stability of the connection of the magnetic component 4, an annular receiving groove 33 is provided on the rear side wall of the second housing 3, and an annular receiving plate 41 is provided on the corresponding magnetic component 4. The receiving plate 41 can be inserted into the receiving groove 33. After being inserted, the annular plate 6 is fixed to the rear side wall of the second housing 3 by bolts, screws or buckles and other detachable connection methods. Figure 4 The screw holes on the rear side wall of the second housing 3 are not shown. Since bolt and screw hole connections are a technique known to those skilled in the art, when bolts are selected for connection, screw holes will inevitably be made. Therefore, similar situations will not be described again below. It should be noted that when bolts or screws are selected as the connection method, the outer radius of the ring plate 6 should be larger than the outer radius of the receiving plate 41 / receiving groove 33 to reserve the position for the screw holes.

[0029] In addition, the front end of the third housing 5 is provided with an outer edge 51, and the third housing 5 is detachably connected to the rear side wall of the second housing 3 through the outer edge 51. It should be noted that the inner diameter of the third housing 5 is larger than the outer diameter of the ring plate 6, so that a blank surface is reserved on the rear side wall of the second housing 3, and most of the electrical components are installed on the blank surface, while a small number of electrical components are installed on the third housing 5. In short, all electrical components are housed within the third housing 5.

[0030] Preferably, the outer sidewall of the third housing 5 is provided with a plurality of heat dissipation holes 53 to facilitate heat dissipation of the electrical components inside.

[0031] Preferably, a docking ring 52 is fixedly connected to the rear side wall of the third housing 5, and a connection port is provided on its side wall. This way, whether it is assembled with the support or the robotic arm, the connection port can face outward, which facilitates the installation operation.

[0032] For ease of understanding, combined with Figures 2-4 The assembly process of strength testing device 1 is as follows: See Figure 1 First, the head of the slider is inserted into the rear of the first sliding hole 7, with a portion of the slider exposed outside the first sliding hole 7; see also Figure 3 At least one insert 9 is provided on the rear sidewall A of the first housing 11 around the first sliding hole 7, so as to... Figure 3 For example, this embodiment provides four insert blocks 9, and four slots 31 are provided on the outside of the corresponding second sliding holes 32. After the slider is inserted into the first sliding hole 7, the head of the second sliding hole 32 of the second housing 3 is fitted onto the exposed slider, so that the slider can slide along its axis in the slide channel formed by the first sliding hole 7 and the second sliding hole 32. The a end of the insert block 9 is inserted into the b end of the slot 31. Then the rear side wall A of the first housing 11 will fit against the front side wall B of the second housing 3. Multiple connecting plates 8 are provided at the rear outer edge of the first housing 11. After the rear side wall A fits against the front side wall B, the first housing 11 and the second housing 3 are fixedly connected by detachable connections such as bolts, screws or buckles. At this time, the slider is restricted to slide in the slide channel. When disassembly is required later, the first housing 11 and the second housing 3 can be disassembled directly to remove the slider. Alternatively, the slider can be reinserted and assembled according to the above steps.

[0033] Next, see Figure 4 After the first housing 11 and the second housing 3 are assembled, the magnetic component 4 is inserted into the tail of the second sliding hole 32. At this time, the receiving plate 41 will be inserted into the receiving groove 33. Then the ring plate 6 is installed, and finally the third housing 5 is installed.

[0034] Specifically, see Figure 2 The slider consists of a contact 2 and a slider 22. The contact 2 is located on the front side of the slider 22, which is slidably connected within the slide rail. During detection, the slider 22 moves the contact 2 closer to or further away from the plate surface. Specifically, the slider 22 is cylindrical in this embodiment, but its cross-sectional shape is not limited to a circle; it can also be square, triangular, rhomboid, etc. Correspondingly, the cross-section of the first sliding hole 7 is also circular, and its inner diameter is the same as the outer diameter of the slider 22. Similarly, when the cross-sectional shape of the slider 22 is square, triangular, or rhomboid, the cross-section of the first sliding hole 7 is also square, triangular, or rhomboid.

[0035] Furthermore, in this embodiment, the contact 2 is a circular plate-shaped structure, but the shape of the contact 2 is not limited to a circular plate shape; it can also be square, triangular, rhomboid, or even spherical or conical structures. The outer contour of the contact 2 cannot exceed the outer contour of the slider 22 to avoid hindering the sliding of the slider 22. For example, in this embodiment, the outer diameter of the circular plate-shaped contact 2 must be less than or equal to the outer diameter of the slider 22.

[0036] Furthermore, Figure 5 The internal structure of the strength testing device 1 is shown. See [link / reference] Figure 2 and Figure 5 A positioning plate 315 is provided on the outside of the slider 22. After the second sliding hole 32 is fitted onto the slider, the positioning plate 315 will be restricted to slide within the slot 31, thereby preventing the slider from rotating around the x-axis; also, through Figure 5 It can be seen that the insertion block 9, when inserted into the slot 31, can limit the sliding distance of the positioning plate 315 within the slot 31. A shorter insertion block 9 results in a longer sliding distance for the positioning plate 315 and the slider 22 within the slot 31; conversely, a longer insertion block 9 results in a shorter sliding distance for the positioning plate 315 and the slider 22 within the slot 31. A pressure sensor 21 is provided between the contact 2 and the slider 22, and its outer contour is smaller than or equal to the outer contour of the slider 22. Furthermore, the distance between the front end face C of the first housing 11 and the front sidewall of the magnetic component 4 is L1, and the length of the overall structure formed by the contact 2, pressure sensor 21, and slider 22 in the x-axis direction is L2, where L1 > L2, and 15 ≤ L1 - L2 ≤ 25 (unit: cm).

[0037] Preferably, the contact 2 and the pressure sensor 21 are detachably connected.

[0038] The principle behind the above scheme is as follows: The first detection mode is static loading, where the front end face C of the first housing 11 is in contact with the surface of the plate (the surface of the car floor, car wall, car top, and car door). The slider 22 is fixedly magnetic, and the side of the slider 22 closest to the magnetic component 4 is N / S. In the first detection mode, the side of the magnetic component 4 closest to the slider 22 has the same polarity as the slider 22. For example, when the rear side of the slider 22 is the N pole, the front side of the magnetic component 4 is also the N pole. Figure 5 As shown, based on the principle of like poles repelling each other, the slider 22 will slide forward under the action of repulsive force, causing the contact 2 to slide forward and then adhere to the plate surface. At this time, the current in the magnetic component 4 increases, and the repulsive force on the slider 22 increases, thereby squeezing the plate surface and realizing the static loading detection of the plate surface.

[0039] The second detection mode is an impact test. Returning to the initial state, the front magnetism of the magnetic component 4 differs from the rear magnetism of the slider 22. For example, the rear of the slider 22 is the N pole, and the front of the magnetic component 4 is the S pole. As a result, the slider 22 adheres to the magnetic component 4 due to the attraction between opposite poles. Since L1 > L2, an impact distance (i.e., L1 - L2, 15cm ≤ L1 - L2 ≤ 25cm) is formed between the contact 2 and the board surface. Upon impact, the magnetic component 4 changes its magnetism, and the slider 22, under the influence of repulsive force, slides forward rapidly, causing the contact 2 to impact the board surface, thus achieving the impact test of the board surface.

[0040] In this process, most of the acceleration of slider 22 occurs in the early stage. The acceleration distance of 15-25cm is sufficient for contact 2 to obtain enough kinetic energy within the range of significant magnetic force, ensuring that contact 2 reaches the required speed and simulating actual impact conditions, such as an elevator car being hit by an object.

[0041] It should be noted that during the detection process, the first detection mode and the second detection mode do not have a specific order, and the first detection mode and the second detection mode can exist independently. For example, in a single detection, only the first detection mode is used for static loading detection.

[0042] The following explanation is provided for the first detection mode: Assume the testing standard for this example is set as follows: under a concentrated static load of 500N, held for 10 seconds, the residual deformation after unloading is ≤0.5mm.

[0043] First, the front end face C of the first housing 11 of the device is tightly attached to the point to be measured on the car wall panel. Then, the magnetic element 4 and the slider 22 are set to the "like poles repel each other" mode. In the initial stage, a low current is provided to generate a small pre-tightening repulsive force (for example, corresponding to 50N), so that the contact element 2 just contacts the plate surface, and the pressure sensor 21 obtains the initial reading (i.e., the force value).

[0044] Scenario 1: Linearly increase the driving current of magnetic component 4. Assume the current increases from an initial 1.0A to 5.0A. According to the approximate square relationship between electromagnetic force and current (F∝I², but actual effect is influenced by magnetic circuit saturation), the magnetic repulsion force on slider 22 increases accordingly from approximately 50N to the target value of 500N. During this stage, if the car wall panel has sufficient rigidity, the deformation of the panel surface is negligible. The reading of pressure sensor 21 will increase almost in real-time and proportionally with the increase in magnetic repulsion force (see...). Figure 8 F1 = F2, where F1 is the magnetic repulsive force acting on the plate surface and F2 is the reaction force acting on the pressure sensor 21. The force eventually stabilizes at 500N and is maintained for 10 seconds. This indicates that the plate surface remains elastic under load.

[0045] Scenario 2: If, when the current increases to 4.0A (corresponding to a repulsive force of approximately 320N), the reading of pressure sensor 21 stops rising and stabilizes at 300N, even if the current is further increased to 5.0A, the reading of pressure sensor 21 no longer increases and may even begin to fluctuate and decrease. This indicates that when the magnetic repulsive force exceeds the local yield strength of the plate surface (approximately 300N), plastic indentation begins to occur on the plate surface (e.g., ...). Figure 10 (As shown). The contact 2 continues to move forward as the plate surface is concave. The work done by the magnetic repulsion force is mainly used to overcome the plastic deformation of the plate surface, rather than being entirely converted into pressure on the pressure sensor 21.

[0046] Therefore, scenario one indicates that the test is qualified, while scenario two indicates that the test is unqualified.

[0047] The following explanation is provided regarding the second detection mode: An object with an equivalent mass (the mass of the sliding element, i.e., the total mass of contact 2, pressure sensor 21, and slider 22) of 2.0 kg impacts the car door at a speed of v = 1.5 m / s. Its kinetic energy is 1 / 2 * m * v² = 2.25 J. The device enables the contact to acquire this kinetic energy by changing the magnetic repulsive force (i.e., acceleration a) and the acceleration distance (s = L1 - L2).

[0048] Initial state: Fix the front end face C of the device at a specific distance (s=15, 20, 25cm) from the test point of the car door.

[0049] Reset / Attraction Stage: Set the current of magnetic component 4 to 0.5A, causing it to attract the opposite poles of slider 22. The resulting attraction force is approximately 30N. This force is much greater than the weight of the slider assembly and the static friction of the slide rail, sufficient to reliably pull it back and adhere it to the front side of the magnetic component, completing the reset. At the same time, it avoids excessive attraction force that could lead to release difficulties or instability in the initial impact state.

[0050] Impact trigger: The current in the magnetic component 4 reverses and surges instantaneously, generating a strong repulsive force.

[0051] Parameter calculation and setting under different acceleration distances: According to the physics formulas v²=2*a*s and F=m*a, to achieve the same final velocity v=1.5m / s, the required acceleration a and repulsive force F are inversely proportional to the acceleration distance s.

[0052] Given: m = 2.0 kg, v = 1.5 m / s, target kinetic energy is 2.25 J.

[0053] calculate: When s = 0.15m (15cm): The required acceleration is a = v² / (2*s) = 2.25 / (2*0.15) = 7.5 m / s². The required magnetic repulsion force F = m * a = 2.0 * 7.5 = 15.0 N (This is the average force. The actual electromagnetic repulsion force changes rapidly with distance, and a larger peak force is needed at the moment of startup to overcome static friction and achieve rapid startup. The peak current should be set to generate an instantaneous repulsion force much greater than this, for example: a peak force of 80-100 N, to ensure that the target speed is reached within a very short effective acceleration range.) Magnetic component current setting: To achieve a peak repulsive force on the order of 100N, based on the electromagnetic characteristics of the device, the current needs to be increased to approximately 8.0-10.0A within milliseconds.

[0054] When s = 0.20m (20cm): a = 2.25 / (2 * 0.20) = 5.625 m / s²; F = 2.0 * 5.625 = 11.25 N (average force); To achieve the same final velocity, a smaller average acceleration and force are required. The peak repulsive force is set to approximately 60-75 N.

[0055] Magnetic component current setting: The corresponding peak current can be set to 6.0-8.0A.

[0056] When s = 0.25m (25cm): a = 2.25 / (2 * 0.25) = 4.5 m / s²; F = 2.0 * 4.5 = 9.0 N (average force); The acceleration process is the most gradual. The peak repulsive force is set to approximately 50-60N.

[0057] Magnetic component current setting: The corresponding peak current can be set to 5.0-6.5A.

[0058] result: Scenario 1: The board surface is qualified (mainly elastic response, no structural damage); The pressure sensor 21 curve is characterized by a rapid rise in force to a relatively high peak value, followed by oscillations at a high frequency and a relatively rapid decay to zero or near the baseline. The curve shape is relatively clean, and the decay process exhibits the inherent damped vibration characteristics of the material. In other words, the plate surface undergoes localized elastic deformation under impact, and most of the impact energy propagates and dissipates within the structure as stress waves, or is converted into the overall vibrational kinetic energy of the plate. Pressure sensor 21 recorded this complete elastic impact response.

[0059] Scenario 2: Plastic indentation or ductile tearing occurs on the board surface; The pressure sensor 21 curve is characterized by the following: after the force value rises, a distinct plateau or a phase of slow force decrease occurs near the peak or during the decline phase, followed by further decay. In other words, when the impact energy causes the plate material to yield and produce a permanent indentation, some of the impact energy is absorbed by plastic deformation. This absorption process prolongs the time the force acts, which is represented on the curve as a slow release of force (plateau region).

[0060] Scenario 3: Brittle fracture or penetration occurs on the plate surface; The pressure sensor 21 curve is characterized by a rapid rise in force value to a certain high point, followed by a sudden and precipitous drop to zero or near zero, with almost no subsequent oscillation. In other words, the plate surface fractures brittlely or is punctured at the impact point, losing its ability to support the contact element. The reaction force disappears instantly, causing the pressure sensor 21 reading to plummet.

[0061] Second embodiment, Figure 6 The strength testing device 1 with locking plate 311 is shown; see [link / reference]. Figure 6 and combined Figures 1-4 The strength testing device 1 comprises a housing, a sliding member, and a magnetic member 4. The housing contains a slide rail with an axis, the sliding member is slidably disposed on one side of the slide rail, and the magnetic member 4 is fixed to the other side of the slide rail. The housing includes a first housing 11, a second housing 3, and a third housing 5, all of which are detachably connected. The first housing 11 has a first through-hole 7, and the second housing 3 has a second through-hole 32. The first through-hole 7 and the second through-hole 32 together form the slide rail, and the tail portion of the second through-hole 32 accommodates a portion of the magnetic member 4.

[0062] Specifically, the slider consists of a contact 2 and a slider 22. The contact 2 is located on the front side of the slider 22, and the slider 22 is slidably connected in the slide rail. During detection, the slider 22 moves the contact 2 closer to or away from the plate surface. A positioning plate 315 is provided on the outside of the slider 22. After the second sliding hole 32 is fitted onto the slider, the positioning plate 315 will be restricted to slide within the slot 31.

[0063] The core of this embodiment lies in the further utilization of the positioning plate 315. Specifically, the positioning plate 315 is locked under the action of the locking plate 311, so that the slider 22 can remain stationary after it is in position under the repulsive force generated by the magnetic component 4. The specific position in position is determined by the engagement position of the positioning plate 315 and the locking plate 311. Figure 6 For example: due to the hook of locking plate 311 ( Figure 7As can be seen from the image, when the slider 22 is in contact with the magnetic component 4, there is still a gap between the hook of the positioning plate 315 and the locking plate 311. When the magnetic component 4 generates a repulsive force, the slider 22 will move forward. After the hook of the positioning plate 315 and the locking plate 311 engages, the slider 22 will be in place and will not be able to slide forward, remaining stationary.

[0064] In this embodiment, when the slider 22 remains stationary, the front sidewall of the contact 2 is flush with the front end surface C. Thus, during the first detection mode (static loading), the front sidewall of the contact 2 and the front end surface C are in contact with the plate surface together. When unlocking, the repulsive force will be directly transmitted to the plate surface through the contact 2. For example: In the first embodiment, during the first detection mode, in the initial state, the slider 22 is in contact with the magnetic component 4 due to the attraction between opposite poles, while the front sidewall of the contact component 2 is not in contact with the plate surface. Therefore, during the detection, a stage is required where the magnetic component 4 generates a weak repulsive force, causing the slider 22 to drive the contact component 2 to slide slowly until the front sidewall of the contact component 2 contacts the plate surface. At this time, the repulsive force generated by the magnetic component 4 increases, and after reaching the target pressure, static loading detection is performed.

[0065] In this embodiment, while the front end face C is in contact with the plate surface, the front side wall of the contact member 2 is also in contact with the plate surface, and the slider 22 is in a locked state. Therefore, the repulsive force generated by the magnetic member 4 can be directly adjusted to the target pressure. When unlocked, the repulsive force will be directly transmitted to the plate surface through the contact member 2.

[0066] In contrast, this embodiment reconstructs the initial conditions for magnetic loading. This design allows the magnetic component 4 to be pre-established and precisely adjusted to the target pressure, thereby achieving near-zero-delay direct loading of pressure from the magnetic source to the tested plate surface at the moment of unlocking. Its core advantage lies in completely eliminating the preparation stage in the first embodiment, which not only significantly shortens the test cycle, but more importantly, since the repulsive force is stabilized at the target value before transmission and the transmission path is locked, the application of force is more instantaneous and pure, which greatly improves the accuracy of the starting point of static loading. The pressure borne by the tested plate surface is the target load from the initial moment, avoiding the interference caused by slight pre-pressure (even if very small) that may exist in the preparation stage in the traditional method on the material's microscopic contact state or initial displacement measurement.

[0067] Furthermore, due to the installation of the locking plate 311, this embodiment improves the operating mode of the second detection mode: See Figure 11The difference is that when performing the second detection mode (impact test), the front end face C and the test piece 10 plate surface are directly reserved with an impact distance M1. It should be noted that since the slider 22 has a limited sliding distance after unlocking, the specific sliding distance M2 is the distance between the positioning plate 315 and the insertion block 9 when the slider 22 is stationary. Therefore, M1 < M2.

[0068] After unlocking, the contact 2 gains acceleration due to the repulsive force, and then impacts the surface of the test piece 10 to achieve the impact test.

[0069] Because this embodiment employs repulsive force preloading and locking control, the acceleration process of contact 2 from rest to impact with the plate surface is more efficient (while in the first embodiment, the acceleration process of contact 2 is synchronized with the establishment of repulsive force. The repulsive force gradually increases with changes in driving current or position. When the contact starts moving from rest, the initial repulsive force is small, and the acceleration is low. To reach the target impact speed, a sufficiently long acceleration distance is required). Under the premise of achieving the same impact speed, the required acceleration distance M1 can be significantly shortened. This not only allows the initial position of the contact to be closer to the plate surface (10cm≤M1≤15cm), but also improves the compactness and controllability of the test.

[0070] It should be emphasized that there is no specific limitation on the acceleration distance M1 in this embodiment. The above example only shows the advantages of this embodiment compared with the first embodiment. For this embodiment, what is more important is that the acceleration distance M1 is not limited and can detect the strength of the panel under the same initial acceleration (i.e., initial repulsive force), different acceleration distances M1, or the same acceleration distance M1 with different initial accelerations (i.e., initial repulsive forces). Furthermore, some special obstacles can be set in this distance, such as some protective layers on the panel or some buffer measures.

[0071] For details, see Figure 7 The locking plate 311 is disposed in the slot 31 along the x-axis. The locking plate 311 is rotatably connected to the rear side of the slot 314, so that the locking plate 311 can move away from or closer to the positioning plate 315. The two ends of the rotating shaft 314 are fixedly connected to the side wall of the slot 31; or the rotating shaft 314 is fixedly connected to the locking plate 311 and rotatably connected to the side wall of the slot 31. In short, the locking plate 311 can be moved away from or closer to the positioning plate 315 by rotation.

[0072] Simply put, a fulcrum is formed by the pivot 314, and a push rod 312 is installed inside the slot 31 on the outside of the locking plate 311. The push rod 312 can be electric or hydraulic. The output end of the push rod 312 acts on the rear side of the fulcrum, and a spring 313 is set on the rear side of the fulcrum. One end of the spring 313 is fixedly connected to the slot 31, and the other end is fixedly connected to the outer wall of the locking plate 311.

[0073] It should be noted that, with Figure 7 For example: if the side where the positioning plate 315 is located is the inner side of the locking plate 311, then the other side is the outer side of the locking plate 311.

[0074] See Figure 9 When push rod 312 pushes the locking plate 311 inward, its hook will disengage from the positioning plate 315, thus unlocking the device. Additionally, in the second detection mode, when contact 2 strikes the plate surface, slider 22 will immediately spring back, at which point push rod 312 has reset. (See [link to relevant documentation]). Figure 7 Under the tension of spring 313, locking plate 311 returns to a horizontal state. At the same time, magnetic component 4 generates a weak repulsive force (30-50N) to decelerate the rebounding slider 22. At this time, positioning plate 315 of the rebounding slider 22 will press locking plate 311 at low speed. Locking plate 311 engages with positioning plate 315 to achieve locking. After positioning plate 315 and locking plate 311 engage, a protective gap 23 is reserved between magnetic component 4 and slider 22 to prevent the rebounding slider 22 from hitting magnetic component 4.

[0075] Third embodiment, see Figure 12 This illustrates a preferred application scenario for the strength testing device 1 of the first embodiment. Since, in the first embodiment, the front end face C of the first housing 11 remains in contact with the plate surface during the second testing mode, it is more suitable for scenarios requiring manual positioning, such as: in Figure 12 First, locate the testing position and use the handle to drive the support plate of the tail screw to fit against the other side wall of the car. This completes the fixation of the strength testing device 1 in the horizontal direction. Similarly, in the vertical direction, the handle is used to drive the support plate of the bottom screw to fit against the bottom of the car. This completes the initial installation of the strength testing device 1. Moreover, after installation, whether in the first testing mode or the second testing mode, it is not necessary to adjust the position of the first housing 11.

[0076] Fourth embodiment, see Figure 13 The diagram illustrates a preferred application scenario of the strength testing device 1 in the second embodiment. In the second embodiment, when performing the second testing mode, the front end face C of the first housing 11 needs to be detached from the plate surface. Therefore, a robotic arm is needed to mount the strength testing device 1. Once the robotic arm base is fixed, the position of the strength testing device 1 can be precisely adjusted through multi-axis drive.

[0077] The two application scenarios above are merely examples. Any use of the strength detection device 1 through other mounting methods or structures is within the scope of protection of this invention, such as using the strength detection device 1 by hand or by mounting it on a robot.

[0078] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An elevator car strength testing device (1), characterized in that, include: An outer casing having an internal slide rail with an axis, the slide rail having at least one opening on the axis; A sliding member is disposed on the side of the slide rail with an opening, for pressing or impacting the surface of the elevator car; A magnetic component (4) is provided on the other side of the slide rail and is used to output a positive force or a negative force to the sliding component; the positive force is used for the sliding component to squeeze or impact the surface of the elevator car. as well as, A pressure sensor (21) is installed on the sliding member to obtain the force value when the sliding member squeezes or impacts the surface of the elevator car in real time.

2. The elevator car strength testing device (1) according to claim 1, characterized in that, include: The first detection mode is based on the sliding member pressing against the surface of the elevator car. as well as, The second detection mode is based on the sliding member impacting the surface of the elevator car.

3. The elevator car strength testing device (1) according to claim 2, characterized in that, In both the first and second detection modes, the outer shell is in contact with the surface of the elevator car. The end of the slider near the magnetic component (4) has fixed magnetism, and the magnetic component (4) has variable magnetism; In the initial state, the sliding member is in contact with the magnetic member (4); there is a gap between the front end face of the sliding member and the front end face of the outer shell.

4. The elevator car strength testing device (1) according to claim 2, characterized in that, In the first detection mode, the outer shell is in contact with the surface of the elevator car; in the second detection mode, there is a gap between the outer shell and the surface of the elevator car. The end of the sliding member near the magnetic member (4) has fixed magnetism, and the magnetic member (4) has fixed magnetism; In the initial state, the front end face of the slider is flush with the front end face of the outer shell.

5. The elevator car strength testing device (1) according to any one of claims 1-4, characterized in that, The slider includes: A contact element (2), which is oriented toward the opening, is used to press or impact the panel of the elevator car; as well as, A slider (22) is disposed on the rear side of the contact (2); the slider (22) has fixed magnetism; The pressure sensor (21) is disposed between the contact (2) and the slider (22); When the magnetic component (4) is used to output a positive force, the slider (22) and the magnetic component (4) are like poles that repel each other.

6. The elevator car strength testing device (1) according to claims 1-4, characterized in that, The outer shell includes a first shell (11) and a second shell (3); the first shell (11) is provided with a first sliding hole (7) that runs through the front and back, and the second shell (3) is provided with a second sliding hole (32) that runs through the front and back, and the first sliding hole (7) and the second sliding hole (32) together form a slide. The tail end of the second sliding hole (32) accommodates a portion of the magnetic element (4); The first housing (11) and the second housing (3) are detachably connected.

7. The elevator car strength testing device (1) according to claim 6, characterized in that, A slot (31) is provided outside the second sliding hole (32); a positioning plate (315) is provided outside the sliding member, and the positioning plate (315) is restricted to slide within the slot (31).

8. The elevator car strength testing device (1) according to claim 4, characterized in that, A slot (31) is provided outside the slide rail; a positioning plate (315) is provided outside the sliding member, and the positioning plate (315) is restricted to slide within the slot (31); A locking plate (311) is rotatably connected inside the slot (31), and a fulcrum is formed at the rotatable connection point; a push rod (312) is provided inside the slot (31), and the output end of the push rod (312) acts on the rear side of the fulcrum; a spring (313) is also provided on the rear side of the fulcrum of the locking plate (311), one end of the spring (313) is fixedly connected to the slot (31), and the other end is fixedly connected to the outer wall of the locking plate (311); Under the combined action of the spring (313) and the push rod (312), the locking plate (311) can move away from or closer to the positioning plate (315). The locking plate (311) is close to the positioning plate (315) to lock the positioning plate (315); the locking plate (311) is far away from the positioning plate (315) to unlock the positioning plate (315).

9. The elevator car strength testing device (1) according to claim 8, characterized in that, A protective gap (23) is reserved between the magnetic component (4) and the sliding component; the magnetic component (4) is used to output a positive force so that the locking plate (311) in the initial state engages with the positioning plate (315).

10. The elevator car strength testing device (1) according to claim 8, characterized in that, When the sliding member bounces back after hitting the elevator car's panel, the magnetic member (4) outputs a positive force to decelerate the sliding member.

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