A leaf spring for a steel plate spring

Abstract

The application discloses a steel plate elasticity detection device for a steel plate spring and relates to the technical field of steel plate elasticity detection.The steel plate elasticity detection device comprises a multi-point contact assembly arranged in the inside of a detection device body, the multi-point contact assembly comprises a plurality of movable roller pressure heads, the plurality of roller pressure heads are adsorbed to each other through a magnetic layer arranged on one side of the roller pressure heads to generate a thrust force, and the plurality of roller pressure heads are used for realizing multi-point contact with pits on the surface of a steel plate to achieve elasticity detection; the plurality of roller pressure heads are reset through a second spring arranged on one side of the roller pressure heads; a progressive auxiliary heating assembly is arranged in the inside of the multi-point contact assembly, the progressive auxiliary heating assembly comprises two hot air generators and a plurality of first conveying holes, when a circular gear rotates clockwise, two straight racks connected with the circular gear are driven to move oppositely, the two straight racks move close to each other, and since each contact part is buffered by an independent spring, the contact parts can be self-adaptively attached to the curved surface of the steel plate.

Description

Technical Field

[0001] This invention relates to the field of steel plate elasticity testing technology, specifically to a steel plate elasticity testing device for steel plate springs. Background Technology

[0002] Leaf springs include the elastic element lugs of automotive suspension systems. During manufacturing, the verticality, horizontality, and elasticity of leaf springs need to be tested. An elasticity testing device applies a controllable force to the tested object using a pressure sensor, which can be applied slowly. The pressure sensor accurately measures the displacement and changes of the leaf spring after being subjected to force. The pressure sensor records the magnitude of the force and simultaneously measures the corresponding deformation. The measured force is compared with standard data to calculate the leaf spring's stiffness and elasticity values. Analysis of the data reveals any abnormalities in the leaf spring. The device uses a transmission mechanism to drive a separate pressure head to slowly move downwards, gradually contacting and pressing against the surface of the leaf spring. During the pressing process, pressure sensors near the pressure head record the pressure value in real time, while displacement sensors installed in the device record the descent of the leaf spring after being subjected to force. All recorded data is transmitted to a computer, which compares the data with standard values ​​to detect the degree of deviation between the elasticity and the standard value.

[0003] Traditional methods often use vernier calipers and clamps to measure the vertical and horizontal values ​​of leaf springs. Since different bushing inner diameters require different clamps for individual measurements, the results are inaccurate and cumbersome. The surface of the leaf spring is curved, and a single rigid indenter applies high stress to this curved surface, resulting in a large stress point in the contact area and potential damage to the leaf spring. The gradual movement of the rigid indenter to contact the leaf spring results in a point-to-point discrete measurement, with the area between two contact points being a blind spot. If a defect in the leaf spring happens to be in this blind spot, it is easily missed, reducing the quality of the leaf spring elasticity test. Traditional rigid indenters, due to their small contact area, cause high local stress, leading to localized plastic deformation of the material. This indentation interferes with the measurement results, measuring only the surface compressive strength of the leaf spring rather than its overall elasticity. Curved leaf springs may contain deposits, including condensate, during room temperature testing. Condensate affects the friction coefficient and stability between the indenter and the leaf spring, resulting in unstable test data. Therefore, a leaf spring elasticity testing device is designed to address these issues. Summary of the Invention

[0004] The purpose of this invention is to provide a steel plate elasticity testing device for steel plate springs, in order to solve the problem mentioned in the background art that the rigid indenter has a small contact area, resulting in high local stress and causing local plastic deformation of the material. The measurement results are interfered with by this indentation, and the measurement is of the surface compressive strength of the steel plate rather than the overall elastic value.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a steel plate elasticity testing device for steel plate springs, comprising; The main body of the detection device; A clamping plate is set on one side of the main body of the detection device. A knurled mandrel clamping plate is set on the top of the clamping plate. A bushing is fitted on one end of the knurled mandrel clamping plate. The horizontal arrangement of the bushing and the knurled mandrel clamping plate is used to detect the horizontal dimension of the steel plate. A multi-point contact assembly is disposed inside the main body of the detection device. The multi-point contact assembly includes multiple movable roller pressure heads. The multiple roller pressure heads are attracted to each other by a magnetic layer installed on one side to generate thrust, which is used to realize elastic detection of multi-point contact with the pit on the steel plate surface. The multiple roller pressure heads are reset by a second spring installed on one side. A progressive auxiliary heating component is disposed inside a multi-point contact component. The progressive auxiliary heating component includes two hot air generators and multiple first transmission holes. The multiple first transmission holes are respectively opened on one side of the magnetic layer and are used to progressively transmit hot air through the first transmission holes to the surface of multiple steel plates to dry the condensate adhering to the surface of the steel plates.

[0006] Preferably, a first hydraulic cylinder is provided inside the main body of the detection device, and the output shaft of the first hydraulic cylinder is connected to an elastic detection plate. A detection box is provided on one side of the main body of the detection device, and a detection platform is provided on the top inside the main body of the detection device.

[0007] Preferably, the multi-point contact assembly further includes a micro motor, a circular gear, two abutment frames, two displacement rods, and two displacement blocks. The micro motor is disposed inside the elastic detection plate. The top of the circular gear is connected to the output shaft of the micro motor. The tops of the two abutment frames are respectively connected to the bottom of the elastic detection plate. The two displacement rods are respectively disposed inside the two abutment frames. The two displacement blocks are respectively movably sleeved with one end of the two displacement rods.

[0008] Preferably, the multi-point contact assembly further includes two reinforcing rods, multiple U-shaped blocks, two first springs, multiple contact blocks, multiple auxiliary blocks, and multiple third springs. The two reinforcing rods are respectively disposed inside the two abutment frames. The multiple U-shaped blocks are respectively sleeved on the ends of the two reinforcing rods. One end of each of the two first springs is connected to the bottom of the two displacement blocks. The tops of the two contact blocks are respectively connected to the other ends of the two first springs. One end of each of the multiple third springs is connected to the bottom of the multiple U-shaped blocks. The tops of the other part of the contact blocks are respectively connected to one end of each of the multiple third springs.

[0009] Preferably, the plurality of auxiliary blocks are respectively disposed inside the plurality of contact blocks, and the plurality of roller pressure heads are respectively disposed on both sides of the plurality of auxiliary blocks for rolling contact with the surface of the steel plate.

[0010] Preferably, the multi-point contact assembly further includes multiple second springs, multiple bonding plates, multiple pressure sensors, two straight racks, and two arc-shaped plates. One end of each of the multiple second springs is connected to one side of a multiple contact block, one side of each of the multiple bonding plates is connected to both sides of the multiple contact blocks, the multiple pressure sensors are respectively disposed on one side of a multiple roller pressure head, the two straight racks are respectively connected to one side of two displacement blocks, and the two arc-shaped plates are respectively disposed at the bottom of two abutment frames.

[0011] Preferably, the progressive auxiliary heating assembly further includes two microswitches, four positioning plates, two corrugated pipes, and two heat-conducting pipes. The two microswitches are respectively disposed on one side of the two hot air generators, the four positioning plates are respectively disposed on both sides of the two hot air generators, the two corrugated pipes are respectively disposed at the bottom of the two hot air generators, and one end of the two heat-conducting pipes is respectively connected to one end of the two corrugated pipes.

[0012] Preferably, the progressive auxiliary heating assembly further includes a plurality of second transmission holes, a plurality of conical grooves, and a plurality of through holes. The plurality of conical grooves are respectively opened in the inner cavity of the plurality of auxiliary blocks, the plurality of second transmission holes are respectively opened on the bottom surface of the plurality of auxiliary blocks, and the plurality of through holes are respectively opened at the center position of the plurality of auxiliary blocks. The plurality of first transmission holes, through holes, conical grooves, and second transmission holes are interconnected.

[0013] Preferably, the inside of the testing box is provided with a second hydraulic cylinder, the output shaft of the second hydraulic cylinder is driven by a servo motor, the output shaft of the servo motor is driven by a lead screw, and a clamping plate is sleeved on one end of the lead screw.

[0014] Preferably, a restraint plate is provided on one side of the servo motor, one end of the lead screw is provided on one side of the restraint plate, and a hexagonal nut is threaded onto one end of the knurled mandrel clamp for replacing bushings of different diameters.

[0015] Compared with the prior art, the beneficial effects of the present invention are: In this invention, when the circular gear rotates clockwise, it drives two straight racks meshing with it to move relative to each other. The two straight racks move closer to each other and continue to transmit force to the displacement block. The displacement block moves at one end of the corresponding displacement rod, and the roller pressure head connected to one end of the first spring moves relative to each other. At this time, during the rotation, the roller pressure head gradually contacts the adjacent roller pressure head. Under the connection of the third spring, the force is transmitted to the U-shaped block, which moves at one end of the reinforcing rod. The roller pressure head installed at one end of the first spring first contacts the surface of the steel plate, and the pressure sensor installed on one side of it begins to sense the contact pressure. When the pressure reaches a preset threshold, the computer records the position and pressure data of this point. The displacement block continues to move forward a small distance. When the roller pressure head approaches the adjacent roller pressure head, the two bonding plates also approach each other. The magnetic layers are magnetically connected, attracting each other and enhancing the stability between the two roller pressure heads. The displacement block drives the roller pressure heads to move. As the displacement block continues to move, it triggers the roller pressure heads to drive the other roller pressure heads to move. As the roller pressure heads move, the second spring gradually compresses and deforms. As the compression increases, the force is transmitted to the U-shaped block, which moves at one end of the reinforcing rod, making the movement of the roller pressure heads more stable. Through this process, multiple roller pressure heads can be driven to contact and move, gradually contacting the surface of the steel plate until all roller pressure heads are in contact with the surface of the steel plate. Since each contact part has an independent spring for buffering, they can adaptively conform to the curved surface of the steel plate. Even if the surface of the steel plate is uneven, each roller pressure head can be adjusted by the extension and contraction of the spring to maintain a uniform contact force.

[0016] In this invention, pressing two microswitches activates two hot air generators, gradually producing hot air. The hot air is then transmitted through a corrugated pipe to the interior of a heat-conducting pipe. The heat-conducting pipe then transmits the hot air through the first transmission hole to the interior of the contact block. Because the corrugated pipe is composed of foldable corrugated sheets, it extends and stretches as the displacement block moves, ensuring the hot air is still smoothly transmitted to the bottom of the auxiliary block. When the magnetic layers are attracted, the two adjacent bonding plates are also in a bonded state. At this time, the first transmission holes are bonded together, allowing the hot air to smoothly enter the through hole and then be guided along the conical groove to the interior of multiple second transmission holes. The second transmission holes are located directly above the steel plate, thus transmitting the hot air to the surface of the steel plate. As the temperature rises, the condensate on the steel plate surface gradually evaporates and dries, preventing the condensate from affecting the friction coefficient between the roller pressure head and the steel plate. The temperature rise also promotes the release of residual stress in the surface area of ​​the steel plate. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a steel plate elasticity testing device for steel plate springs according to the present invention; Figure 2This is a schematic diagram of the internal cross-sectional structure of the main body of the steel plate elasticity testing device for steel plate springs according to the present invention; Figure 3 This invention relates to a steel plate elasticity testing device for steel plate springs. Figure 2 A magnified structural diagram at point A; Figure 4 This is a partial bottom view of the steel plate elasticity testing device for steel plate springs according to the present invention. Figure 5 This is a schematic diagram of the multi-point contact assembly in a steel plate elasticity testing device for steel plate springs according to the present invention; Figure 6 This invention relates to a steel plate elasticity testing device for steel plate springs. Figure 5 A magnified structural diagram at point B; Figure 7 This is a partial side view of the straight rack structure in the steel plate elasticity testing device for steel plate springs of the present invention; Figure 8 This is a partial side view of the arc-shaped plate in the steel plate elasticity testing device for steel plate springs according to the present invention. Figure 9 This is a schematic diagram of the progressive auxiliary heating component in a steel plate elasticity testing device for steel plate springs according to the present invention. Figure 10 This invention relates to a steel plate elasticity testing device for steel plate springs. Figure 9 A magnified structural diagram at point C; Figure 11 This is a partial side cross-sectional view of the contact block in a steel plate elasticity testing device for steel plate springs according to the present invention.

[0018] In the diagram: 100. Detection device body; 101. Detection box; 102. Detection table; 103. First hydraulic cylinder; 104. Elastic detection plate; 105. Second hydraulic cylinder; 106. Servo motor; 107. Lead screw; 108. Clamping plate; 109. Knurled mandrel clamping plate; 110. Bushing; 111. Hexagonal nut; 2. Multi-point contact assembly; 201. Micro motor; 202. Circular gear; 203. Abutment frame; 204. Displacement rod; 205. Displacement block; 206. Reinforcing rod; 207. U-shaped block; 208. 209. First spring; 210. Contact block; 211. Auxiliary block; 212. Roller pressure head; 213. Pressure sensor; 214. Adhesive plate; 215. Magnetic layer; 216. Second spring; 217. Straight rack; 218. Third spring; 219. Arc plate; 300. Progressive auxiliary heating assembly; 301. Hot air generator; 302. Micro switch; 303. Positioning plate; 304. Corrugated pipe; 305. Heat pipe; 306. First transfer hole; 307. Second transfer hole; 308. Conical groove; 309. Through hole. Detailed Implementation

[0019] 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.

[0020] To address the problem in existing steel plate elasticity testing devices for leaf springs where the rigid indenter's small contact area leads to high localized stress and causes localized plastic deformation, interfering with the measurement results and resulting in measurements of the surface compressive strength rather than the overall elasticity value, this invention provides a steel plate elasticity testing device for leaf springs. (Refer to...) Figure 1 As shown: including: Detection device body 100; A clamping plate 108 is disposed on one side of the detection device body 100. A knurled mandrel clamping plate 109 is disposed on the top of the clamping plate 108. A bushing 110 is sleeved on one end of the knurled mandrel clamping plate 109. The horizontal arrangement of the bushing 110 and the knurled mandrel clamping plate 109 is used to detect the horizontal dimension of the steel plate. The multi-point contact assembly 2 is disposed inside the detection device body 100. The multi-point contact assembly 2 includes multiple movable roller pressure heads 211. The multiple roller pressure heads 211 are attracted to each other by a magnetic layer 214 installed on one side to generate thrust, which is used to realize elastic detection of multi-point contact with the pit on the steel plate surface. The multiple roller pressure heads 211 are reset by a second spring 215 installed on one side. The progressive auxiliary heating component 3 is disposed inside the multi-point contact component 2. The progressive auxiliary heating component 3 includes two hot air generators 301 and multiple first transmission holes 306. The multiple first transmission holes 306 are respectively opened on one side of the magnetic layer 214, and are used to progressively transmit hot air through the first transmission holes 306 to the surface of multiple steel plates to dry the condensate adhering to the surface of the steel plates.

[0021] First, the worker places the steel plate onto the testing table 102. A displacement sensor, which is a photoelectric encoder, is installed on one side of the testing table 102. This sensor can synchronously monitor the displacement of the pressure head, i.e., the deformation of the steel plate. By activating the first hydraulic cylinder 103, the elastic testing plate 104, which is connected to its output shaft, moves up and down. When the elastic testing plate 104 moves downward, it drives the multi-point contact assembly 2 and the progressive auxiliary heating assembly 3 to gradually move downward. The two gradually approach the steel plate, so that multiple roller pressure heads 211 come into contact with the surface of the steel plate back and forth during rotation to detect elasticity. During the rotational contact process, the pressure sensor 212 records the applied force value in real time. The computer automatically calculates the elastic stiffness of the leaf spring based on the collected force and displacement data. Then, it compares the data with the preset qualified standard range to determine whether the product is qualified and generates a test report. The purpose of the leaf spring elasticity testing device is not just to measure a value, but to ensure the safety, comfort and service life of the leaf spring in the vehicle. If the stiffness is too high, the vehicle will shake violently; if the stiffness is too low, the vehicle will easily bottom out. This is the foundation of the vehicle suspension system. It is necessary to ensure that the leaf springs installed on both ends of the same axle have the same elasticity. If one side is hard and the other side is soft, the vehicle will veer significantly during driving, especially when turning or braking, which is a great safety hazard.

[0022] Preferred, according to Figure 2 and Figure 3As shown, a second hydraulic cylinder 105 is installed inside the testing box 101. The output shaft of the second hydraulic cylinder 105 is driven by a servo motor 106, and the output shaft of the servo motor 106 is driven by a lead screw 107. A clamping plate 108 is sleeved on one end of the lead screw 107. A restraining plate is installed on one side of the servo motor 106, and one end of the lead screw 107 is located on one side of the restraining plate. A hexagonal nut 111 is threaded onto one end of the knurled mandrel clamping plate 109 for replacing bushings 110 of different diameters. A first hydraulic cylinder 103 is installed inside the testing device body 100. The output shaft of the first hydraulic cylinder 103 is driven by an elastic testing plate 104. A testing box 101 is installed on one side of the testing device body 100. A testing platform 102 is installed on the top inside the testing device body 100. The first hydraulic cylinder 103 is fixedly installed inside the testing device body 100, and its output shaft is connected to the elastic testing plate 104. The top transmission connection is as follows: the detection table 102 is fixedly installed at the top inside the detection device body 100; the detection box 101 is fixedly installed on one side of the detection device body 100, and a running groove is opened on one side of the detection device body 100 to facilitate the movement of the bushing 110; the second hydraulic cylinder 105 is fixedly installed inside the detection box 101; one side of the servo motor 106 is connected to the output shaft of the second hydraulic cylinder 105; the binding plate is fixedly installed on one side of the servo motor 106; the two ends of the lead screw 107 are respectively installed on both sides of the binding plate, and the ends are fitted with bearings to allow the lead screw 107 to rotate in place inside the binding plate; the clamping plate 108 is threadedly fitted on one end of the lead screw 107; the knurled mandrel clamping plate 109 is installed on the top of the clamping plate 108; the bushing 110 is movably fitted on one end of the knurled mandrel clamping plate 109; and the hexagonal nut 111 is threadedly fitted on the other end of the knurled mandrel clamping plate 109.

[0023] The horizontal and vertical values ​​of the steel plate can be measured by using a second hydraulic cylinder 105 and a servo motor 106. After the steel plate is placed on top of the testing table 102, it is clamped using existing fixtures to keep it stable on the surface of the testing table 102. The steel plate spring to be tested is placed on the testing table 102, and its lug is fitted onto the bushing 110. At this time, the mandrel and the inner hole of the lug are precisely positioned. Through the linkage of the second hydraulic cylinder 105 and the servo motor 106, the lead screw 107 is driven to rotate, thereby moving the clamping plate 108. The clamping plate 108 and the knurled mandrel are adjusted. When measuring horizontal dimensions, the distance between the center lines of the clamping plates 109 must be ensured to be parallel to the plane passing through the plumb line. This ensures that the mandrel is accurately positioned in the horizontal direction without tilting. At this point, the distance between the clamping plates 108 and the center of the mandrel is the precise horizontal dimension. The second hydraulic cylinder 105 and the servo motor 106 are then activated again to drive the lead screw 107 and clamping plates 108 to move. The distance between the clamping plates 108 and the center line of the mandrel is readjusted so that its value is equal to the vertical dimension required by the drawing. By changing the bushing 110, different inner diameters of the rolled ears can be accommodated.

[0024] To address the problem that traditional rigid indenters, due to their small contact area, result in high local stress, causing localized plastic deformation of the material and interfering with measurement results, a multi-point contact assembly 2 is installed. This assembly utilizes the displacement of a single indenter to sequentially move multiple indenters to contact the curved surface of the steel plate, thus achieving surface contact.

[0025] Preferably, the specific working process of the multi-point contact component 2 is as follows, according to Figure 4 , Figure 5 and Figure 6As shown, the multi-point contact assembly 2 also includes a micro motor 201, a circular gear 202, two abutment frames 203, two displacement rods 204, and two displacement blocks 205. The micro motor 201 is disposed inside the elastic detection plate 104. The top of the circular gear 202 is connected to the output shaft of the micro motor 201. The tops of the two abutment frames 203 are respectively connected to the bottom of the elastic detection plate 104. The two displacement rods 204 are respectively disposed inside the two abutment frames 203. The two displacement blocks 205 are respectively movably sleeved with one end of the two displacement rods 204. The multi-point contact assembly 2 also includes two reinforcing rods 206, multiple U-shaped blocks 207, two first springs 208, multiple contact blocks 209, multiple auxiliary blocks 210, and multiple third springs 217. Rods 206 are respectively installed inside the two abutment frames 203. Multiple U-shaped blocks 207 are respectively fitted onto the ends of the two reinforcing rods 206. One end of each of the two first springs 208 is connected to the bottom of each of the two displacement blocks 205. The tops of each of the two contact blocks 209 are connected to the other ends of each of the two first springs 208. One end of each of the multiple third springs 217 is connected to the bottom of each of the multiple U-shaped blocks 207. The tops of the other part of the contact blocks 209 are connected to one end of each of the multiple third springs 217. Multiple auxiliary blocks 210 are respectively installed inside the multiple contact blocks 209. Multiple roller pressure heads 211 are respectively installed on both sides of the multiple auxiliary blocks 210 for rolling contact with the steel plate surface. A micro motor 201 is fixedly installed inside the elastic detection plate 104.The output shaft of the micro motor 201 is connected to a circular gear 202. Abutment brackets 203 are fixedly installed on both sides of the bottom of the elastic detection plate 104. Displacement rods 204 are fixedly installed inside each of the two abutment brackets 203. Displacement blocks 205 are movably sleeved at one end of each of the two displacement rods 204. Straight racks 216 are fixedly installed on one side of each of the two displacement blocks 205. The two straight racks 216 mesh with the circular gear 202 respectively. The interiors of the two abutment brackets 203 are fixedly equipped with… There are reinforcing rods 206, and a U-shaped block 207 is movably fitted at one end of each of the two reinforcing rods 206. A first spring 208 is fixedly installed at the bottom of each of the two displacement blocks 205. A contact block 209 is fixedly installed at one end of each of the two first springs 208. An auxiliary block 210 is fixedly installed inside each of the two contact blocks 209. A third spring 217 is fixedly installed at the bottom of each of the multiple U-shaped blocks 207. A contact block 209 is fixedly installed at one end of each of the multiple third springs 217. Each of the multiple auxiliary blocks 210 is fixedly installed inside. Roller pressure heads 211 are rotatably mounted on both sides of each auxiliary block 210. A pressure sensor 212 is fixedly installed on one side of each roller pressure head 211. Adhesive plates 213 are fixedly installed on both sides of each contact block 209. A magnetic layer 214 is fixedly installed on one side of each adhesive plate 213. A straight toothed rack 216 is provided on one side of each magnetic layer 214. An arc-shaped plate 218 is fixedly installed at the bottom of each of the two abutment brackets 203. A second spring 215 is fixedly installed on one side of each arc-shaped plate 218, and a second spring 215 is fixedly installed on one side of each of the multiple contact blocks 209. In the initial state, the two straight racks 216 are far apart, located on opposite sides of the bottom of the two abutment brackets 203. The multiple second springs 215 are initially in an extended state. Under elastic action, the multiple U-shaped blocks 207 separate from each other. After the micro motor 201 starts, it drives the circular gear 202, which is connected to its output shaft, to rotate. Figure 5When the circular gear 202 rotates clockwise, it drives the two straight racks 216 meshing with it to move relative to each other. The two straight racks 216 move closer to each other and continue to transmit force to the displacement block 205. The displacement block 205 moves at one end of the corresponding displacement rod 204. The roller pressure head 211 connected to one end of the first spring 208 will move relative to each other. At this time, the roller pressure head 211 will gradually contact the adjacent roller pressure head 211 during rotation. Under the connection of the third spring 217, the force is transmitted to the U-shaped block 207. The U-shaped block 207 moves at one end of the reinforcing rod 206. The roller pressure head 211 installed at one end of the first spring 208 first contacts the U-shaped block 207. On the surface of the steel plate, a pressure sensor 212 installed on one side begins to sense the contact pressure. When the pressure reaches a preset threshold, the computer records the position and pressure data of this point. The displacement block 205 continues to move forward a small distance. When the roller pressure head 211 approaches the adjacent roller pressure head 211, the two bonding plates 213 also approach each other. The installed magnetic layer 214 magnetically connects, and they attract each other, enhancing the stability between the two roller pressure heads 211. The displacement block 205 drives the roller pressure head 211 to move. As the displacement block 205 continues to move, it triggers the roller pressure head 211 to drive the other roller pressure head 211 to move. As the roller pressure head 211 moves, The second spring 215 is gradually compressed and deformed. As the compression increases, the force is transmitted to the U-shaped block 207. The U-shaped block 207 then moves at one end of the reinforcing rod 206, making the roller pressure head 211 move more smoothly. Through this process, multiple roller pressure heads 211 can be driven to contact and move, gradually contacting the surface of the steel plate until all roller pressure heads 211 are in contact with the surface of the steel plate. Since each contact part has an independent spring for buffering, they can adaptively conform to the curved surface of the steel plate. Even if the surface of the steel plate is uneven, each roller pressure head 211 can be adjusted by the extension and contraction of the spring to maintain a uniform contact force. Multiple roller pressure heads 211 form a... The contact surface that matches the curved surface of the steel plate disperses the original single-point high stress into multiple points of low stress. At this time, each pressure sensor 212 is collecting pressure data at that point in real time. By analyzing the distribution of all sensor data, the stiffness curve of the steel plate in the stress area can be obtained, rather than an isolated point data. After the test is completed, the micro motor 201 reverses and drives the displacement block 205 to move backward through the meshing of the circular gear 202 and the straight rack 216. The two straight racks 216 move towards each other, resetting them to their initial positions. Under the action of the first spring 208 and the third spring 217, all contact parts retract in sequence, returning to the initial state, waiting for the next test.

[0026] It is important to note that the multi-point contact component 2, through the activation of the micro motor 201, drives multiple originally separate roller indenters 211 to contact each other sequentially with the curved surface of the steel plate, thus achieving sequential and orderly contact of multiple roller indenters 211. Through the buffer of each independent spring, multiple rigid roller indenters 211 can adaptively conform to any curved surface as a whole, truly achieving rigid-flexible contact. This transforms the traditional point measurement of a single indenter into a surface coverage measurement of multiple indenters, solving the problem of stress concentration damage and eliminating detection blind spots.

[0027] Preferably, the specific working process of the multi-point contact component 2 is as follows, according to Figure 7 and Figure 8 As shown, the multi-point contact assembly 2 also includes multiple second springs 215, multiple bonding plates 213, multiple pressure sensors 212, two straight racks 216, and two arc-shaped plates 218. One end of each of the multiple second springs 215 is connected to one side of each of the multiple contact blocks 209. One side of each of the multiple bonding plates 213 is connected to both sides of each of the multiple contact blocks 209. The multiple pressure sensors 212 are respectively disposed on one side of each of the multiple roller pressure heads 211. The two straight racks 216 are respectively connected to one side of each of the two displacement blocks 205. The two arc-shaped plates 218 are respectively disposed at the bottom of each of the two abutment brackets 203. By moving the first roller pressure head 211, and according to... The subsequent adsorption of the roller indenter 211 achieves a dynamic and continuous path. When the first roller indenter 211 rolls on the steel plate, it measures a continuous trajectory line rather than isolated points, eliminating blind spots and enabling the detection of minute cracks between two points. When the first roller indenter 211 rolls and adsorbs the second roller indenter 211, the second roller indenter 211 passively and smoothly contacts the surface of the steel plate. This soft contact better adapts to the undulations of the steel plate surface, ensuring that each roller indenter 211 maintains a uniform and stable contact pressure with the steel plate surface during contact and rolling, thereby obtaining more accurate elastic force data.

[0028] To address the issue that curved steel plates may contain deposits, including condensate, during room temperature testing, which can affect the friction coefficient and stability between the pressure head and the steel plate, a progressive auxiliary heating component 3 is installed to gradually deliver hot air to the surface of the corresponding steel plate for drying during the movement of the multi-point contact component 2.

[0029] Preferably, the specific working process of the progressive auxiliary heating component 3 is as follows, according to Figure 9 and Figure 10As shown, the progressive auxiliary heating assembly 3 also includes two microswitches 302, four positioning plates 303, two bellows 304, and two heat-conducting pipes 305. The two microswitches 302 are respectively disposed on one side of the two hot air generators 301, the four positioning plates 303 are respectively disposed on both sides of the two hot air generators 301, the two bellows 304 are respectively disposed at the bottom of the two hot air generators 301, and one end of each of the two heat-conducting pipes 305 is connected to one end of each of the two bellows 304. The progressive auxiliary heating assembly 3 also includes multiple second transfer holes 307, multiple conical grooves 308, and multiple through holes 309. Conical grooves 308 are respectively formed in the inner cavities of multiple auxiliary blocks 210, multiple second transfer holes 307 are respectively formed on the bottom surface of multiple auxiliary blocks 210, and multiple through holes 309 are respectively formed at the center of multiple auxiliary blocks 210. Multiple first transfer holes 306, through holes 309, conical grooves 308 and second transfer holes 307 are interconnected. Traditional elasticity testing is usually performed at room temperature. However, during vehicle operation, due to internal damping and inter-leaf friction, the actual operating temperature of leaf springs is usually higher than the ambient temperature, thus deteriorating the quality of elasticity testing. Furthermore, condensation easily adheres to the surface of the leaf springs. When the material is tested at room temperature, it affects the coefficient of friction and contact stability between the roller indenter 211 and the steel plate. Therefore, before the roller indenter 211 contacts the steel plate, pressing the two microswitches 302 will start the two hot air generators 301 to gradually generate hot air. The hot air will be transmitted through the corrugated pipe 304 to the inside of the heat pipe 305. At this time, the heat pipe 305 will transmit the hot air to the inside of the contact block 209 through the first transmission hole 306. Since the corrugated pipe 304 is composed of foldable corrugated sheets, it will extend and stretch when the displacement block 205 moves, so that the corrugated pipe 304 still... Hot air can be smoothly delivered to the bottom of the auxiliary block 210. When the magnetic layer 214 is attracted, the two adjacent bonding plates 213 are also in a bonding state. At this time, the first transmission hole 306 is in a bonding state, allowing the hot air to smoothly enter the through hole 309. Then, it is guided along the conical groove 308 to the interior of multiple second transmission holes 307. The second transmission holes 307 are located directly above the steel plate, so the hot air can be delivered to the surface of the steel plate. As the temperature rises, the condensate on the surface of the steel plate gradually evaporates and dries, avoiding the condensate from affecting the friction coefficient between the roller pressure head 211 and the steel plate. The temperature rise can also promote the release of residual stress in the surface area of ​​the steel plate.

[0030] Working Principle: First, the operator places the steel plate onto the testing table 102. A displacement sensor, which is a photoelectric encoder, is installed on one side of the testing table 102. This sensor can synchronously monitor the displacement of the pressure head, i.e., the deformation of the steel plate. By activating the first hydraulic cylinder 103, the elastic testing plate 104, which is connected to its output shaft, moves up and down. When the elastic testing plate 104 moves downward, it drives the multi-point contact component 2 and the progressive auxiliary heating component 3 to gradually move downward. Both components gradually approach the steel plate, causing multiple roller pressure heads 211 to repeatedly contact the surface of the steel plate during rotation to detect elasticity. During the rotational contact process, the pressure sensor 212 records the applied force value in real time. Based on the collected force and displacement data, the computer automatically calculates the elastic stiffness of the steel plate. Then, the data is compared with the preset qualified standard range to determine the product's performance. The purpose of the leaf spring elasticity testing device is not merely to measure a numerical value, but to ensure the safety, comfort, and service life of the leaf springs in vehicles. Excessive stiffness will cause severe vehicle bumps, while insufficient stiffness will make the vehicle prone to bottoming out. This is fundamental to the vehicle suspension system. It ensures that the leaf springs mounted on both ends of the same axle have the same elasticity. If one side is stiff and the other soft, the vehicle will exhibit significant deviation during driving, especially when turning or braking, posing a significant safety hazard. Initially, the two straight racks 216 are far apart, located on either side of the bottom of the two abutment brackets 203. Multiple second springs 215 are initially in an extended state. Under elastic action, multiple U-shaped blocks 207 separate. After the micro motor 201 starts, it drives the circular gear 202, which is connected to its output shaft, to rotate. (Reference) Figure 5When the circular gear 202 rotates clockwise, it drives the two straight racks 216 meshing with it to move relative to each other. The two straight racks 216 move closer to each other and continue to transmit force to the displacement block 205. The displacement block 205 moves at one end of the corresponding displacement rod 204. The roller pressure head 211 connected to one end of the first spring 208 will move relative to each other. At this time, the roller pressure head 211 will gradually contact the adjacent roller pressure head 211 during rotation. Under the connection of the third spring 217, the force is transmitted to the U-shaped block 207. The U-shaped block 207 moves at one end of the reinforcing rod 206. The roller pressure head 211 installed at one end of the first spring 208 first contacts the surface of the steel plate, and the pressure sensor 212 installed on one side of it begins to move. Sensing contact pressure, when the pressure reaches a preset threshold, the computer records the position and pressure data of this point. The displacement block 205 continues to move forward a small distance. When the roller pressure head 211 approaches the adjacent roller pressure head 211, the two bonding plates 213 also approach each other. The installed magnetic layer 214 magnetically connects, thus attracting each other together, enhancing the stability between the two roller pressure heads 211. The displacement block 205 drives the roller pressure head 211 to move. During the continued movement of the displacement block 205, it triggers the roller pressure head 211 to drive the other roller pressure head 211 to move. As the roller pressure head 211 moves, the second spring 215 gradually compresses and deforms. As the compression increases, the force is transmitted to the U-shaped block 207, which then... The movement of one end of the fixed rod 206 makes the movement of the roller pressure head 211 more stable. Through this process, multiple roller pressure heads 211 can be driven to contact and move, gradually contacting the surface of the steel plate until all roller pressure heads 211 are in contact with the surface of the steel plate. Since each contact part has an independent spring for cushioning, they can adaptively conform to the curved surface of the steel plate. Even if the surface of the steel plate is uneven, each roller pressure head 211 can adjust through the extension and contraction of the spring to maintain a uniform contact force. Multiple roller pressure heads 211 form a contact surface that conforms to the curved surface of the steel plate, dispersing the original single-point high stress into multiple points of low stress. At this time, each pressure sensor 212 is collecting the pressure data at that point in real time. By analyzing all the sensor data... The distribution of instrument data allows us to obtain the stiffness curve of the steel plate in the stress area, rather than an isolated point data. After the test is completed, the micro motor 201 reverses, driving the displacement block 205 backward through the meshing of the circular gear 202 and the straight rack 216. The two straight racks 216 move towards each other, resetting them to their initial positions. Under the action of the first spring 208 and the third spring 217, all contact parts retract sequentially, returning to their initial state, ready for the next test. Traditional elasticity testing is usually performed at room temperature. However, during vehicle operation, due to internal damping and inter-leaf friction, the actual operating temperature of the steel leaf spring is usually higher than the ambient temperature, thus deteriorating the quality of the elasticity test. Furthermore, condensation easily adheres to the surface of the steel plate.These deposits can affect the coefficient of friction and contact stability between the roller indenter 211 and the steel plate during room temperature testing. Therefore, before the roller indenter 211 contacts the steel plate, pressing the two microswitches 302 will activate the two hot air generators 301, gradually generating hot air. The hot air will be transmitted through the corrugated pipe 304 to the interior of the heat pipe 305. At this time, the heat pipe 305 will transmit the hot air to the interior of the contact block 209 through the first transmission hole 306. Since the corrugated pipe 304 is composed of foldable corrugated sheets, it will extend and stretch when the displacement block 205 moves, allowing the corrugated pipe 304 to... The hot air can still be smoothly delivered to the bottom of the auxiliary block 210. When the magnetic layer 214 is attracted, the two adjacent bonding plates 213 are also in a bonded state. At this time, the first transmission holes 306 are bonded to each other, allowing the hot air to smoothly enter the through hole 309, and then be guided along the conical groove 308 to the interior of multiple second transmission holes 307. The second transmission holes 307 are located directly above the steel plate, thus delivering the hot air to the surface of the steel plate. As the temperature rises, the condensate on the surface of the steel plate gradually evaporates and dries, preventing the condensate from affecting the friction coefficient between the roller pressure head 211 and the steel plate. The temperature rise can also promote the release of residual stress in the surface area of ​​the steel plate.

[0031] The pressure sensor 212 and displacement sensor in this invention are common knowledge in the field, and their working principle is a well-known technology. The appropriate model is selected according to the actual use. Therefore, the control method and wiring layout of the pressure sensor 212 and displacement sensor will not be explained in detail.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting the elasticity of a steel plate spring, characterized in that, include: Detection device body (100); A clamping plate (108) is provided on one side of the detection device body (100). A knurled mandrel clamping plate (109) is provided on the top of the clamping plate (108). A bushing (110) is sleeved on one end of the knurled mandrel clamping plate (109). The horizontal arrangement of the bushing (110) and the knurled mandrel clamping plate (109) is used to detect the horizontal dimension of the steel plate. A multi-point contact assembly (2) is disposed inside the detection device body (100). The multi-point contact assembly (2) includes multiple movable roller pressure heads (211). The multiple roller pressure heads (211) are attracted to each other by a magnetic layer (214) installed on one side to generate thrust, which is used to realize elastic detection of multi-point contact with the pit on the steel plate surface. The multiple roller pressure heads (211) are reset by a second spring (215) installed on one side. A progressive auxiliary heating component (3) is disposed inside the multi-point contact component (2). The progressive auxiliary heating component (3) includes two hot air generators (301) and multiple first transmission holes (306). The multiple first transmission holes (306) are respectively opened on one side of the magnetic layer (214) for progressively transmitting hot air through the first transmission holes (306) to the surface of multiple steel plates to dry the condensate adhering to the surface of the steel plates. The detection device body (100) is equipped with a first hydraulic cylinder (103) inside. The output shaft of the first hydraulic cylinder (103) is connected to an elastic detection plate (104). A detection box (101) is provided on one side of the detection device body (100). A detection platform (102) is provided on the top inside the detection device body (100). The multi-point contact assembly (2) further includes a micro motor (201), a circular gear (202), two abutment frames (203), two displacement rods (204), and two displacement blocks (205). The micro motor (201) is disposed inside the elastic detection plate (104). The top of the circular gear (202) is connected to the output shaft of the micro motor (201). The tops of the two abutment frames (203) are respectively connected to the bottom of the elastic detection plate (104). The two displacement rods (204) are respectively disposed inside the two abutment frames (203). The two displacement blocks (205) are respectively movably sleeved with one end of the two displacement rods (204).

2. The steel plate elasticity testing device for steel plate springs according to claim 1, characterized in that: The multi-point contact assembly (2) further includes two reinforcing rods (206), multiple U-shaped blocks (207), two first springs (208), multiple contact blocks (209), multiple auxiliary blocks (210), and multiple third springs (217). The two reinforcing rods (206) are respectively disposed inside the two abutment frames (203). The multiple U-shaped blocks (207) are respectively sleeved on the ends of the two reinforcing rods (206). One end of the two first springs (208) is respectively connected to the bottom of the two displacement blocks (205). The top of the two contact blocks (209) is respectively connected to the other end of the two first springs (208). One end of the multiple third springs (217) is respectively connected to the bottom of the multiple U-shaped blocks (207). The top of the other part of the contact blocks (209) is respectively connected to one end of the multiple third springs (217).

3. The steel plate elasticity testing device for steel plate springs according to claim 2, characterized in that: Multiple auxiliary blocks (210) are respectively disposed inside multiple contact blocks (209), and multiple roller pressure heads (211) are respectively disposed on both sides of multiple auxiliary blocks (210) for rolling contact with the surface of the steel plate.

4. The steel plate elasticity testing device for steel plate springs according to claim 3, characterized in that: The multi-point contact assembly (2) also includes multiple second springs (215), multiple bonding plates (213), multiple pressure sensors (212), two straight racks (216), and two arc plates (218). One end of each of the multiple second springs (215) is connected to one side of each of the multiple contact blocks (209). One side of each of the multiple bonding plates (213) is connected to both sides of each of the multiple contact blocks (209). Each of the multiple pressure sensors (212) is disposed on one side of each of the multiple roller pressure heads (211). Each of the two straight racks (216) is connected to one side of each of the two displacement blocks (205). Each of the two arc plates (218) is disposed at the bottom of each of the two abutment frames (203).

5. The steel plate elasticity testing device for steel plate springs according to claim 1, characterized in that: The progressive auxiliary heating assembly (3) also includes two micro switches (302), four positioning plates (303), two bellows (304) and two heat pipes (305). The two micro switches (302) are respectively located on one side of the two hot air generators (301), the four positioning plates (303) are respectively located on both sides of the two hot air generators (301), the two bellows (304) are respectively located at the bottom of the two hot air generators (301), and one end of the two heat pipes (305) is respectively connected to one end of the two bellows (304).

6. The steel plate elasticity testing device for steel plate springs according to claim 5, characterized in that: The progressive auxiliary heating component (3) also includes a plurality of second transmission holes (307), a plurality of conical grooves (308) and a plurality of through holes (309). The plurality of conical grooves (308) are respectively opened in the inner cavity of a plurality of auxiliary blocks (210), the plurality of second transmission holes (307) are respectively opened on the bottom surface of a plurality of auxiliary blocks (210), and the plurality of through holes (309) are respectively opened at the center position of a plurality of auxiliary blocks (210). The plurality of first transmission holes (306), through holes (309), conical grooves (308) and second transmission holes (307) are interconnected.

7. The steel plate elasticity testing device for steel plate springs according to claim 1, characterized in that: The detection box (101) is equipped with a second hydraulic cylinder (105). The output shaft of the second hydraulic cylinder (105) is connected to a servo motor (106). The output shaft of the servo motor (106) is connected to a lead screw (107). One end of the lead screw (107) is fitted with a clamping plate (108).

8. The steel plate elasticity testing device for steel plate springs according to claim 7, characterized in that: A binding plate is provided on one side of the servo motor (106), and one end of the lead screw (107) is provided on one side of the binding plate. A hexagonal nut (111) is threaded onto one end of the knurled mandrel clamp (109) for replacing bushings (110) of different diameters.

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