Steel plate spring testing device

Abstract

The utility model relates to the technical field of steel plate springs, and discloses a steel plate spring testing device which comprises a detection box, a protective door is movably installed at the front end of the detection box, supporting legs are installed at the positions, close to the two sides, in the detection box, and a steel plate spring body is arranged at the top ends of the supporting legs. Pressure sensors are arranged at the joints of the supporting legs and the steel plate spring body, electric push rods are installed in the middles of the two sides of the detection box, and push rods of the two electric push rods penetrate through the detection box and are fixedly connected with limiting blocks. The detection temperature in the detection box can be adjusted as required through a hydraulic push rod and a heating pipe, and the pressure is gradually increased until the steel plate spring body is damaged, so that the ultimate strength of the steel plate spring body is conveniently measured, the steel plate spring body is prevented from being broken and splashed in the testing process, and injury to personnel is avoided; and the hydraulic push rod can be adjusted to different positions of the steel plate spring body to apply force.

Description

Technical Field

[0001] This utility model relates to the field of leaf spring technology, specifically a leaf spring testing device. Background Technology

[0002] Leaf springs are widely used suspension elastic elements in automobiles. Their advantages include simple structure, reliable operation, low cost, and convenient maintenance. They serve as both the elastic element and the guiding device of the suspension. One end is hinged to the vehicle frame, allowing it to transmit various forces and torques and determine the trajectory of the wheels. They also provide some friction and shock absorption. During the production of leaf springs, random sampling inspections are required to ensure that their performance and quality meet the standards.

[0003] Chinese patent provides a fatigue testing device for leaf springs, publication number CN221405070U, which includes an operating table. A fixing frame and a mounting base are fixedly connected to the top of the operating table. An air hammer is fixedly connected to the top of the inner cavity of the fixing frame, and electric push rod housings are fixedly connected to both sides of the fixing frame.

[0004] The above-mentioned device, through the coordinated use of the operating table, fixed frame, mounting base, air hammer, electric push rod, limiting shell, insertion rod, bidirectional threaded rod, rocker arm, threaded sleeve, positioning frame and steel leaf spring body, solves the problem that existing fatigue testing devices are inconvenient to install different types of steel leaf springs and require the use of matching tools for installation, thereby reducing the working efficiency of the fatigue testing device.

[0005] However, its detection structure is relatively simple. Due to the complex driving environment of vehicles, it only uses an air hammer to simulate the force test, resulting in poor detection effect. Furthermore, the test is directly exposed to the outside, and the spring sheet is prone to breakage during the test, posing certain hidden dangers. Utility Model Content

[0006] The purpose of this invention is to provide a steel leaf spring testing device that can effectively solve the problems in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A steel leaf spring testing device includes a testing box, a protective door is movably installed at the front end of the testing box, and support feet are installed on both sides of the interior of the testing box. A steel leaf spring body is provided at the top of the support feet, and a pressure sensor is provided at the connection between the support feet and the steel leaf spring body.

[0009] Electric push rods are installed at the center of both sides of the testing box. The push rods of the two electric push rods pass through the testing box and are fixedly connected to limit blocks. Two mounting seats are fixedly connected to the upper part of the inside of the testing box. Hydraulic push rods are slidably installed at the bottom of the mounting seats. Adjusting bolts are threaded through the front end of the hydraulic push rods. Several adjusting threaded holes matching the hydraulic push rods are opened at the front end of the mounting seats. Several heating tubes are installed at the lower part of the inside of the testing box. A protective plate is installed inside the testing box and above the heating tubes.

[0010] Preferably, a number of ventilation holes are provided through the upper and lower ends of the protective plate, and the heating tube does not contact the bottom wall of the testing box or the bottom surface of the protective plate.

[0011] Preferably, the testing box has two air inlets located at the upper part of its interior, and two air supply pipes are connected to the top of the testing box on one side. The ends of the two air supply pipes that extend into the testing box are respectively connected to the air supply ports of the air inlets.

[0012] Preferably, the protective door is made of a high-temperature resistant transparent material, and a handle is provided at the end of the protective door away from the testing box.

[0013] Preferably, the two sides of the leaf spring body are located inside the limiting block, and a limiting rod that is compatible with the leaf spring body is movably installed through the front end of the limiting block.

[0014] Preferably, an air hammer is installed in the center of the inside of the testing box, and the center point of the air hammer and the hydraulic push rod is on the same vertical line as the center point of the leaf spring body.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention utilizes a combination of a hydraulic push rod, an air hammer, a heating element, an air inlet, and an air delivery pipe. During the testing of the leaf spring body, the temperature inside the testing chamber can be adjusted as needed. Simultaneously, by continuously pressing down the hydraulic push rod, the data of the leaf spring body under static load can be detected to assess its load-bearing capacity and stiffness. Furthermore, by gradually increasing the pressure until the leaf spring body is destroyed, its ultimate strength can be determined.

[0017] By setting up a testing box and protective door in conjunction with the leaf spring body, the leaf spring body can be tested in a closed state to prevent it from breaking and flying during the test, thus avoiding injury to personnel. Furthermore, by using the mounting base and adjusting bolts in conjunction with the hydraulic push rod, the hydraulic push rod can be adjusted to different positions on the leaf spring body to apply force, making it highly flexible in use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a steel leaf spring testing device according to an embodiment of the present invention;

[0019] Figure 2 This is a front view of the steel leaf spring body in an embodiment of this utility model;

[0020] Figure 3 This is a cross-sectional view of the connection between the hydraulic push rod and the adjusting bolt in an embodiment of this utility model;

[0021] Figure 4 This is a top view of the steel leaf spring body and protective plate in an embodiment of this utility model.

[0022] In the diagram: 1. Testing box; 2. Protective door; 3. Support leg; 4. Steel leaf spring body; 5. Electric push rod; 6. Limit block; 7. Heating tube; 8. Protective plate; 9. Air hammer; 10. Air inlet; 11. Air supply pipe; 12. Mounting base; 13. Hydraulic push rod; 14. Adjusting bolt. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1

[0025] Combination Figures 1-4 A steel leaf spring testing device includes a testing box 1, a protective door 2 movably installed at the front end of the testing box 1, support feet 3 installed on both sides inside the testing box 1, a steel leaf spring body 4 installed at the top of the support feet 3, and a pressure sensor installed at the connection between the support feet 3 and the steel leaf spring body 4.

[0026] See Figure 2 and Figure 4Furthermore, electric push rods 5 are installed at the center of both sides of the test box 1. The push rods of the two electric push rods 5 pass through the test box 1 and are fixedly connected to the limit block 6. Two mounting seats 12 are fixedly connected at the upper part of the inside of the test box 1. Hydraulic push rods 13 are slidably installed at the bottom of the mounting seats 12. Several heating tubes 7 are installed at the lower part of the inside of the test box 1. A protective plate 8 is installed inside the test box 1 and above the heating tubes 7. Several vent holes are opened at the upper and lower ends of the protective plate 8. The heating tubes 7 do not contact the bottom wall of the test box 1 or the bottom surface of the protective plate 8. Two air inlets 10 are set at the upper part of the inside of the test box 1. Two air supply pipes 11 are connected to the top of the test box 1 at one side. The ends of the two air supply pipes 11 that extend into the test box 1 are respectively connected to the air supply ports of the air inlets 10. An air hammer 9 is installed at the center of the inside of the test box 1. The center point of the air hammer 9 and the push rod of the hydraulic push rod 13 are on the same vertical line as the center point of the steel leaf spring body 4.

[0027] Specifically, based on existing technology, the sampled leaf spring body 4 can be placed at the support foot 3. After fixing the side of the leaf spring body 4 with the electric push rod 5 and the limiting block 6, the air hammer 9 can be activated to perform fatigue monitoring on the leaf spring body 4, simulating the fatigue condition of the leaf spring body 4 during long-term use and assessing its fatigue life. At the same time, the hydraulic push rod 13 can be activated to move the push rod down to a suitable position to detect the deformation characteristics of the leaf spring body 4 under static load, determine its load-bearing capacity and stiffness. The pressure can be gradually increased until the leaf spring body 4 is damaged, which facilitates the determination of its ultimate strength. During the above testing process, the environment inside the testing chamber 1 can be heated by energizing the heating tube 7. At the same time, cold air can be supplied into the testing chamber 1 by connecting the air inlet 10 to the external cold air supply pipe to adjust the temperature inside the testing chamber 1, thereby testing the changes of the leaf spring body 4 at different temperatures.

[0028] Example 2

[0029] See Figure 2 and Figure 3 Furthermore, based on Embodiment 1, the front end of the hydraulic push rod 13 is threaded with an adjusting bolt 14, the front end of the mounting base 12 is provided with several adjusting threaded holes that are compatible with the hydraulic push rod 13, the protective door 2 is made of high temperature resistant transparent material, and a handle is provided at the end of the protective door 2 away from the detection box 1. The two sides of the steel leaf spring body 4 are inside the limiting block 6, and a limiting rod that is compatible with the steel leaf spring body 4 is movably installed through the front end of the limiting block 6.

[0030] Specifically, the test box 1 and protective door 2 can be used to isolate and test the leaf spring body 4 to ensure that its fracture and fragmentation will not cause injury to personnel, thus eliminating certain safety hazards. At the same time, since the hydraulic push rod 13 is installed in the mounting base 12 through a slider and fixed by tightening the adjusting bolt 14, during use, the hydraulic push rod 13 can be adjusted to different positions of the leaf spring body 4 by unscrewing the adjusting bolt 14 and pushing the hydraulic push rod 13 to slide at the mounting base 12. After adjustment, the adjusting bolt 14 can be tightened again. By adjusting the force position of the hydraulic push rod 13, the changes in force at different positions of the leaf spring body 4 can be detected, which provides high flexibility in use.

[0031] In actual operation, the leaf spring body 4 can be placed at the support foot 3 according to the existing technology. After the side of the leaf spring body 4 is fixed by the electric push rod 5 and the limiting block 6, the air hammer 9 can be started to monitor the fatigue of the leaf spring body 4, so as to simulate the fatigue of the leaf spring body 4 in long-term use and evaluate its fatigue life. At the same time, the hydraulic push rod 13 can be started to move the push rod down to a suitable position to detect the deformation characteristics of the leaf spring body 4 under static load and determine its load-bearing capacity and stiffness.

[0032] Meanwhile, by gradually increasing the pressure until the leaf spring body 4 is destroyed, it is easy to determine its ultimate strength. During the above test, the environment inside the test chamber 1 can be heated by energizing the heating tube 7. At the same time, cold air can be supplied into the test chamber 1 by connecting the air inlet 10 to the external cold air supply pipe to adjust the temperature inside the test chamber 1, thereby testing the change of the leaf spring body 4 at different temperatures.

[0033] The test box 1 and protective door 2 can be used to isolate and test the leaf spring body 4 to ensure that its fracture and fragmentation will not cause injury to personnel, thus eliminating certain safety hazards. At the same time, since the hydraulic push rod 13 is installed in the mounting base 12 through a slider and fixed by tightening the adjusting bolt 14, during use, the hydraulic push rod 13 can be adjusted to different positions of the leaf spring body 4 by unscrewing the adjusting bolt 14 and pushing the hydraulic push rod 13 to slide at the mounting base 12. After adjustment, the adjusting bolt 14 can be tightened again. By adjusting the force position of the hydraulic push rod 13, the changes in force at different positions of the leaf spring body 4 can be detected, which provides high flexibility in use.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steel spring testing apparatus characterized by: Including detection box (1), the front end of detection box (1) is movably installed with protective door (2), the inside of detection box (1) is installed with support foot (3) at both sides positions, the top of support foot (3) is provided with steel plate spring body (4), and support foot (3) and steel plate spring body (4) are connected with pressure sensor; The both sides of detection box (1) are installed with electric push rod (5) at the central position, the push rod of two electric push rods (5) penetrates detection box (1) and is fixedly connected with limit block (6), the inside of detection box (1) is fixedly connected with two mounting seats (12) at the upper position, the bottom of mounting seat (12) is slidably installed with hydraulic push rod (13), the front end of hydraulic push rod (13) is threadedly connected with adjusting bolt (14), the front end of mounting seat (12) is provided with a plurality of adjusting screw holes matched with hydraulic push rod (13), the inside of detection box (1) is installed with a plurality of heating pipes (7) at the lower position, the inside of detection box (1) is installed with protective plate (8) above heating pipe (7).

2. A device for testing a leaf spring as defined in claim 1, characterized in that: A plurality of air holes are formed in the upper and lower ends of protective plate (8), and the heating pipe (7) is not in contact with the bottom wall of the detection box (1) and the bottom surface of the protective plate (8).

3. A device for testing a leaf spring as defined in claim 1, characterized in that: Two air inlets (10) are arranged at the upper position in the inside of the detection box (1), two gas supply pipes (11) are connected to the top of the detection box (1) at one side position, and the ends of the two gas supply pipes (11) extending into the detection box (1) are connected to the gas inlets (10) respectively.

4. A device for testing a leaf spring as defined in claim 1, characterized in that: The protective door (2) is made of high-temperature-resistant transparent material, and the end of the protective door (2) away from the detection box (1) is provided with a pull handle.

5. A device for testing a leaf spring as defined in claim 1, wherein: The both sides of the steel plate spring body (4) are in the inside of the limit block (6), and the front end of the limit block (6) is movably installed with a limit plug rod matched with the steel plate spring body (4).

6. A device for testing a leaf spring as defined in claim 1, characterized in that: An air hammer (9) is installed at the central position in the inside of the detection box (1), and the center points of the air hammer (9) and the hydraulic push rod (13) and the center point of the steel plate spring body (4) are on the same vertical line.

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