Automobile plate spring stress detection method

Abstract

The invention discloses an automobile plate spring stress detection method, and relates to the technical field of steel plate spring stress detection, and the method specifically comprises the following steps: 1, employing a detection device, and enabling hanging lugs at two ends of a plate spring main body to be fixedly connected with two pulleys; secondly, the multiple strain gauges are symmetrically attached to the bottom end of the plate spring body; and thirdly, an electric push rod is started to apply load to the plate spring body, and a strain gauge detects the strain value of the plate spring body. By arranging the special detection equipment, the method for detecting the stress of the plate spring by using the resistance strain gauge is simpler, more convenient and more reliable to operate, and the detection efficiency can be effectively improved. The method can be suitable for stress detection of the upper surfaces of the first leaf springs of all types of steel plate springs, is simple and efficient, and can accurately detect the stress value of the steel plate spring in the loading state.

Description

Technical Field

[0001] The present invention relates to the technical field of stress detection of leaf springs, and specifically to a method for detecting the stress of automotive leaf springs. Background Art

[0002] Automotive leaf springs are important elastic components in the vehicle suspension system. Due to their good reliability, simple structure, short manufacturing process flow, low cost, and simplified structure, they are widely used. Automotive leaf springs are generally composed of several alloy spring steels of different lengths combined into a group similar to an equal-strength spring beam. As a key component of the vehicle suspension system, the leaf spring bears complex alternating loads, and its stress state directly affects the driving performance and safety of the vehicle. Therefore, the stress detection of leaf springs is an important link in evaluating the performance of leaf springs and ensuring their safety and reliability. There are various stress detection methods for leaf springs, and the commonly used ones include the finite element analysis method, the resistance strain gauge method, and the fiber Bragg grating sensor detection method. Among them, the detection principle of the resistance strain method is to paste a resistance strain gauge on the surface of the leaf spring and calculate the stress by measuring the resistance change of the strain gauge. This method is widely used because of its high precision, fast response speed, and ability to directly measure local stress.

[0003] However, at present, there is a lack of a dedicated detection device for detecting the stress of automotive leaf springs by the resistance strain method, especially a device with a dedicated clamping fixture, resulting in the disadvantages of low integration, complex clamping operation, and low detection efficiency in the prior art when applying this detection method. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for detecting the stress of automotive leaf springs in order to solve the technical problems existing in the background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A method for detecting the stress of automotive leaf springs, and the specific steps are as follows: Step 1: Use a detection device to fixedly connect the two end lugs of the leaf spring main body to two trolleys respectively through a fixing mechanism, and connect the output end of the electric push rod to the middle position of the leaf spring main body through a connecting mechanism; Step 2: Symmetrically attach a plurality of strain gauges to the outer surface of the spring leaves of the leaf spring main body; Step 3: Start the electric push rod to apply a load to the leaf spring main body, and the strain gauge detects the strain value of the leaf spring main body; The detection device includes a base, the top of the base is fixedly connected with a mounting frame, the electric push rod is installed at the top of the mounting frame, two trolleys are symmetrically slidably connected to the top of the base and are located below the mounting frame, the strain gauge is installed at the top of the base, a wire is fixedly connected to the outer wall of the strain gauge, and the strain gauge is electrically connected to the strain gauge through the wire.

[0006] As a further solution of the present invention: The fixing mechanism includes a displacement groove, the displacement groove is opened at the top end of the base, the trolleys are symmetrically and slidably connected to the inner wall of the displacement groove, the inner wall of the displacement groove is symmetrically provided with sliding grooves on both sides, the outer walls of both sides of the trolleys are symmetrically fixedly connected with sliding rods, the sliding rods are slidably connected to the inner wall of the sliding grooves, the bottom end of the trolleys is rotatably connected with a connecting rod, the middle position of the bottom end of the inner wall of the displacement groove is rotatably connected with a rotating rod, both ends of the rotating rod are respectively connected to the two connecting rods, the top end of the trolleys is fixedly connected with a fixing plate, the outer wall of the fixing plate is provided with insertion holes, an activity groove is opened inside the trolleys, an activity frame is slidably connected to the inner wall of the activity groove, a plug rod is fixedly connected to the outer wall of the activity frame, a fixing groove is opened on the outer wall of the activity frame, a fixing block extending to the inner wall of the activity groove is slidably connected inside the trolleys, a first rotating block is rotatably connected to the outer wall of the trolleys, one end of the first rotating block is fixedly connected with a first threaded rod, and the first threaded rod extends into the fixing block.

[0007] As a further solution of the present invention: The connecting mechanism includes a mounting seat, the mounting seat is connected to the output end of the electric push rod, a vertical rod is slidably connected to the inner wall of the mounting seat, a clamping seat is fixedly connected to the bottom end of the vertical rod, an upper clamping plate is fixedly connected to the bottom end of the clamping seat, a displacement plate extending below the clamping seat is slidably connected inside the clamping seat, a lower clamping plate is fixedly connected to the outer wall of the displacement plate, a clamping block is slidably connected to one side of the displacement plate inside the clamping seat, a first spring is connected between the clamping block and the clamping seat, a push plate is slidably connected to the top of the clamping block inside the clamping seat, a second threaded rod passing through the push plate is rotatably connected inside the clamping seat, one end of the second threaded rod is fixedly connected with a second rotating block, a third rotating block is rotatably connected above the second rotating block on the outer wall of the clamping seat, one end of the third rotating block is fixedly connected with a third threaded rod, a positioning frame is slidably connected to the outer wall of the third threaded rod, the positioning frame is slidably connected inside the vertical rod and the clamping seat, a reinforcing plate is slidably connected to one side of the positioning frame inside the clamping seat, a second spring is connected between the reinforcing plate and the clamping seat, and a reinforcing groove is opened at the top end of the clamping block.

[0008] As a further solution of the present invention: The outer wall of the plug rod fits with the inner wall of the insertion hole, and the inner wall of the activity groove fits with the outer wall of the activity frame.

[0009] As a further solution of the present invention: The inner wall of the fixing groove fits with the outer wall of the fixing block, a first threaded hole is opened on the outer wall of the fixing block, and the first threaded hole matches the first threaded rod.

[0010] As a further solution of the present invention: ratchet teeth are provided on the outer wall of the displacement plate, and one end of the clamping block is engaged with the ratchet teeth.

[0011] As a further solution of the present invention: the outer wall of the clamping block is L-shaped, a second threaded hole is provided on the outer wall of the push plate, and the second threaded hole is matched with the second threaded rod.

[0012] As a further solution of the present invention: a third threaded hole is provided on the outer wall of the positioning frame, the third threaded hole is matched with the third threaded rod, the outer wall of the vertical rod is attached to the inner wall of the mounting seat, a card slot is provided on the inner wall of the mounting seat, and one end of the positioning frame is engaged with the card slot.

[0013] As a further solution of the present invention: one side of the reinforcing plate is provided with an inclined surface, and the outer wall of the bottom of the reinforcing plate is attached to the inner wall of the reinforcing groove.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By setting a dedicated detection device, the method of using a resistance strain gauge to detect the stress of the leaf spring is made more simple and reliable in operation, and the detection efficiency can be effectively improved. When using the detection method of the present invention to detect the stress of the leaf spring, through the strain gauge provided in the detection device, the strain gauge is pasted at the measuring point on the leaf spring body, the strain gauge is connected to the strain gauge through a wire, the electric push rod operates to apply a load to the leaf spring body. When the leaf spring body deforms, the resistance value of the strain gauge will change, and the strain value can be deduced by detecting this change; this method can be applied to the stress detection of the upper surface of the first leaf spring of all types of steel leaf springs, and can also be used for the stress detection of other exposed outer leaf springs. This detection method is simple, efficient, and can accurately detect the stress value of the steel leaf spring under the loading state.

[0015] 2. The detection device is provided with a fixing mechanism to push the movable frame to slide in the movable groove. The displacement of the movable frame drives the insertion rod to displace. The insertion rod passes through one end of the leaf spring body and is inserted into the jack, and one end of the leaf spring body is fixedly connected to the pulley. Then, the first rotating block is rotated. The rotation of the first rotating block drives the first threaded rod to rotate. The rotation of the first threaded rod drives the fixing block to displace. The fixing block is displaced and inserted into the fixing groove to fix the position of the movable frame, which is convenient for fixedly connecting one end of the leaf spring body to the pulley.

[0016] 3. The detection device places the leaf spring body between the upper clamping plate and the lower clamping plate by setting a connection mechanism, pushes the displacement plate to displace, and the upper clamping plate and the lower clamping plate together clamp the leaf spring body at the bottom of the clamping seat. At this time, the clamping block is engaged with the displacement plate under the elastic force of the first spring to fix the displacement plate; push the vertical rod to slide in the mounting seat, and after completion, rotate the third rotating block to drive the positioning frame to displace, and the positioning frame is engaged with the inner wall of the mounting seat to fix the position between the mounting seat and the clamping seat, facilitating the positioning of the leaf spring body at the output end of the electric push rod. Description of the Drawings

[0017] Figure 1 Schematic structural diagram of the detection device of the present invention; Figure 2 Schematic installation diagram of the strain gauge of the detection device of the present invention; Figure 3 Schematic internal structure diagram of the base of the detection device of the present invention; Figure 4 Schematic installation diagram of the movable frame of the detection device of the present invention; Figure 5 Schematic internal structure diagram of the pulley of the detection device of the present invention; Figure 6 Schematic structural diagram of the clamping seat of the detection device of the present invention; Figure 7 Schematic internal structure diagram of the mounting seat of the detection device of the present invention; Figure 8 Schematic internal structure diagram of the clamping seat of the detection device of the present invention; Figure 9 Schematic structural diagram of the clamping block of the detection device of the present invention.

[0018] In the figure: 1, base; 2, mounting frame; 3, electric push rod; 4, pulley; 5, leaf spring body; 6, fixing mechanism; 601, displacement groove; 602, sliding groove; 603, sliding rod; 604, connecting rod; 605, rotating rod; 606, fixing plate; 607, jack; 608, moving groove; 609, movable frame; 610, inserting rod; 611, fixing groove; 612, fixing block; 613, first threaded rod; 614, first rotating block; 7, connecting mechanism; 701, mounting seat; 702, vertical rod; 703, clamping seat; 704, upper clamping plate; 705, displacement plate; 706, lower clamping plate; 707, clamping block; 708, first spring; 709, push plate; 710, second threaded rod; 711, second rotating block; 712, third rotating block; 713, third threaded rod; 714, positioning frame; 715, reinforcing plate; 716, second spring; 717, reinforcing groove; 8, strain gauge; 9, wire; 10, strain gauge. Detailed implementation manners

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. The embodiments of the present invention will be described below according to its overall structure.

[0021] Please refer to Figures 1 to 9 , in the embodiments of the present invention, a method for detecting the stress of an automotive leaf spring specifically includes the following steps: Step 1: Using a detection device, the hanging ears at both ends of the leaf spring main body 5 are respectively fixedly connected to two trolleys 4 through a fixing mechanism 6, and the output end of the electric push rod 3 is connected to the middle position of the leaf spring main body 5 through a connecting mechanism 7; Step 2: A plurality of strain gauges 10 are symmetrically attached to the outer surface of the leaf spring of the leaf spring main body 5; Step 3: Start the electric push rod 3 to apply a load to the leaf spring main body 5, and the strain gauge 8 detects the strain value of the leaf spring main body 5.

[0022] The detection device includes a base 1, a mounting frame 2 is fixedly connected to the top of the base 1, the electric push rod 3 is installed on the top of the mounting frame 2, two trolleys 4 are symmetrically slidably connected to the top of the base 1 and are located below the mounting frame 2, the strain gauge 8 is installed on the top of the base 1, a wire 9 is fixedly connected to the outer wall of the strain gauge 8, and the strain gauge 10 is electrically connected to the strain gauge 8 through the wire 9.

[0023] In this embodiment: The strain gauge 10 is pasted at the measuring point on the leaf spring body 5. The strain gauge 10 is electrically connected to the strain gauge 8 through the wire 9. The two ends of the leaf spring body 5 are respectively fixedly connected to the two trolleys 4 through the fixing mechanism 6. The output end of the electric push rod 3 is connected to the middle position of the leaf spring body 5 through the connecting mechanism 7. When the electric push rod 3 operates to apply a load to the leaf spring body 5, when the leaf spring body 5 deforms, the resistance value of the strain gauge 10 will change, and the strain value can be deduced by detecting this change.

[0024] Please refer specifically to Figures 3 to 5 , the fixing mechanism 6 includes a displacement groove 601. The displacement groove 601 is opened at the top end of the base 1. The trolleys 4 are symmetrically slidably connected to the inner wall of the displacement groove 601. Two symmetrically arranged sliding grooves 602 are opened on both sides of the inner wall of the displacement groove 601. Two symmetrically arranged sliding rods 603 are fixedly connected to both sides of the outer wall of the trolley 4. The sliding rods 603 are slidably connected to the inner wall of the sliding groove 602. A connecting rod 604 is rotatably connected to the bottom end of the trolley 4. The middle position of the bottom end of the inner wall of the displacement groove 601 is rotatably connected to a rotating rod 605. Both ends of the rotating rod 605 are respectively connected to the two connecting rods 604. A fixing plate 606 is fixedly connected to the top end of the trolley 4. A jack 607 is opened on the outer wall of the fixing plate 606. An activity groove 608 is opened inside the trolley 4. An activity frame 609 is slidably connected to the inner wall of the activity groove 608. A plug rod 610 is fixedly connected to the outer wall of the activity frame 609. A fixing groove 611 is opened on the outer wall of the activity frame 609. A fixing block 612 extending to the inner wall of the activity groove 608 is slidably connected inside the trolley 4. A first rotating block 614 is rotatably connected to the outer wall of the trolley 4. One end of the first rotating block 614 is fixedly connected to a first threaded rod 613. The first threaded rod 613 extends into the inside of the fixing block 612.

[0025] In this embodiment: When the trolley 4 makes a displacement, the sliding rod 603 slides in the sliding groove 602, and the trolley 4 slides in the displacement groove 601. The displacement of the trolley 4 drives the rotating rod 605 to rotate through the connecting rod 604. The rotation of the rotating rod 605 drives another trolley 4 to make a displacement through another connecting rod 604, so that the two trolleys 4 perform displacement operations synchronously and in opposite directions.

[0026] When fixing the leaf spring body 5, one end of the leaf spring body 5 is placed between the fixed plate 606 and the movable frame 609. Then, the movable frame 609 is pushed to slide in the movable slot 608. The displacement of the movable frame 609 drives the displacement of the insertion rod 610. The insertion rod 610 passes through the ear at one end of the leaf spring body 5 and is inserted into the insertion hole 607, fixedly connecting one end of the leaf spring body 5 to the pulley 4. Then, the first rotating block 614 is rotated. The rotation of the first rotating block 614 drives the rotation of the first threaded rod 613. The rotation of the first threaded rod 613 drives the displacement of the fixed block 612. The displacement of the fixed block 612 is inserted into the fixed slot 611 to fix the position of the movable frame 609, facilitating the fixed connection between the leaf spring body 5 and the pulley 4.

[0027] Please refer specifically to Figures 6 to 9 As shown in Figures 6 to 9 , the connecting mechanism 7 includes a mounting base 701. The mounting base 701 is connected to the output end of the electric push rod 3. A vertical rod 702 is slidably connected to the inner wall of the mounting base 701. The bottom end of the vertical rod 702 is fixedly connected to a clamping seat 703. The bottom end of the clamping seat 703 is fixedly connected to an upper clamping plate 704. A displacement plate 705 extending below the clamping seat 703 is slidably connected to the inside of the clamping seat 703. A lower clamping plate 706 is fixedly connected to the outer wall of the displacement plate 705. A clamping block 707 is slidably connected to the inside of the clamping seat 703 on one side of the displacement plate 705. A first spring 708 is connected between the clamping block 707 and the clamping seat 703. A push plate 709 is slidably connected to the inside of the clamping seat 703 at the top of the clamping block 707. A second threaded rod 710 passing through the push plate 709 is rotatably connected to the inside of the clamping seat 703. One end of the second threaded rod 710 is fixedly connected to a second rotating block 711. A third rotating block 712 is rotatably connected to the outer wall of the clamping seat 703 above the second rotating block 711. One end of the third rotating block 712 is fixedly connected to a third threaded rod 713. A positioning frame 714 is slidably connected to the outer wall of the third threaded rod 713. The positioning frame 714 is slidably connected to the inside of the vertical rod 702 and the clamping seat 703. A reinforcing plate 715 is slidably connected to the inside of the clamping seat 703 on one side of the positioning frame 714. A second spring 716 is connected between the reinforcing plate 715 and the clamping seat 703. A reinforcing groove 717 is opened at the top of the clamping block 707.

[0028] In this embodiment: Place the leaf spring body 5 between the upper clamping plate 704 and the lower clamping plate 706. Then, push the displacement plate 705 to move. The displacement of the displacement plate 705 drives the lower clamping plate 706 to move. The upper clamping plate 704 and the lower clamping plate 706 together clamp the leaf spring body 5 at the bottom of the clamping seat 703. At this time, the clamping block 707 is engaged with the displacement plate 705 under the elastic force of the first spring 708 to fix the displacement plate 705. When removing the leaf spring body 5, rotate the second rotating block 711. The rotation of the second rotating block 711 drives the second threaded rod 710 to rotate. The rotation of the second threaded rod 710 drives the push plate 709 to move. The displacement of the push plate 709 causes the clamping block 707 to move. The displacement of the clamping block 707 separates from the displacement plate 705, canceling the fixation of the displacement plate 705, so that the leaf spring body 5 can be removed.

[0029] After clamping the leaf spring body 5, push the vertical rod 702 to slide in the mounting seat 701, thereby adjusting the distance between the mounting seat 701 and the clamping seat 703, and the leaf spring body 5 can be lifted and lowered so that the two end lugs are respectively connected to the two trolleys 4. After completing the connection with the trolley 4, rotate the third rotating block 712. The rotation of the third rotating block 712 drives the third threaded rod 713 to rotate. The rotation of the third threaded rod 713 drives the positioning frame 714 to move. The positioning frame 714 moves and engages with the inner wall of the mounting seat 701, thereby fixing the vertical rod 702 in the mounting seat 701, and further realizing the fixing operation of the position between the mounting seat 701 and the clamping seat 703. At the same time, the displacement of the positioning frame 714 pushes the reinforcement plate 715 to move, squeezing the second spring 716. The bottom end of the reinforcement plate 715 is inserted into the reinforcement groove 717 to fix the clamping block 707, so as to prevent the displacement plate 705 from loosening during the detection, causing the leaf spring body 5 to loosen. This design facilitates the stable positioning of the leaf spring body 5 at the output end of the electric push rod 3.

[0030] Please refer specifically to Figures 3 to 5 , the outer wall of the insertion rod 610 fits with the inner wall of the insertion hole 607, and the inner wall of the movable groove 608 fits with the outer wall of the movable frame 609.

[0031] In this embodiment: Push the movable frame 609 to slide in the movable groove 608. The displacement of the movable frame 609 drives the insertion rod 610 to move. The insertion rod 610 passes through one end of the leaf spring body 5 and is inserted into the insertion hole 607 to fixedly connect one end of the leaf spring body 5 with the trolley 4.

[0032] Please refer specifically to Figures 3 to 5 , the inner wall of the fixing groove 611 fits with the outer wall of the fixing block 612. The outer wall of the fixing block 612 is provided with a first threaded hole, and the first threaded hole matches the first threaded rod 613.

[0033] In this embodiment: Rotate the first rotating block 614. The rotation of the first rotating block 614 drives the first threaded rod 613 to rotate. The rotation of the first threaded rod 613 drives the fixed block 612 to displace. The fixed block 612 displaces and inserts into the fixed slot 611 to fix the position of the movable frame 609.

[0034] Please refer specifically to Figures 6 to 9 , a ratchet is provided on the outer wall of the displacement plate 705, and one end of the clamping block 707 is engaged with the ratchet.

[0035] In this embodiment: Push the displacement plate 705 to displace. The displacement of the displacement plate 705 drives the lower clamping plate 706 to displace. The upper clamping plate 704 and the lower clamping plate 706 together clamp the leaf spring main body 5 at the bottom end of the clamping seat 703. At this time, the clamping block 707 is engaged with the displacement plate 705 under the elastic force of the first spring 708 to fix the displacement plate 705.

[0036] Please refer specifically to Figures 6 to 9 , the outer wall shape of the clamping block 707 is L-shaped, and a second threaded hole is provided on the outer wall of the push plate 709, and the second threaded hole is matched with the second threaded rod 710.

[0037] In this embodiment: When removing the leaf spring main body 5, rotate the second rotating block 711. The rotation of the second rotating block 711 drives the second threaded rod 710 to rotate. The rotation of the second threaded rod 710 drives the push plate 709 to displace. The push plate 709 displaces and the clamping block 707 displaces. The clamping block 707 displaces and separates from the displacement plate 705 to cancel the fixation of the displacement plate 705.

[0038] Please refer specifically to Figures 6 to 9 , a third threaded hole is provided on the outer wall of the positioning frame 714, and the third threaded hole is matched with the third threaded rod 713. The outer wall of the vertical rod 702 is in contact with the inner wall of the mounting seat 701. A clamping groove is provided on the inner wall of the mounting seat 701, and one end of the positioning frame 714 is engaged with the clamping groove.

[0039] In this embodiment: Rotate the third rotating block 712. The rotation of the third rotating block 712 drives the third threaded rod 713 to rotate. The rotation of the third threaded rod 713 drives the positioning frame 714 to displace. The positioning frame 714 displaces and engages with the inner wall of the mounting seat 701, thereby fixing the vertical rod 702 in the mounting seat 701.

[0040] Please refer specifically to Figures 6 to 9 , one side of the reinforcing plate 715 is provided with an inclined surface, and the bottom outer wall of the reinforcing plate 715 is in contact with the inner wall of the reinforcing groove 717.

[0041] In this embodiment: The displacement of the positioning frame 714 pushes the reinforcement plate 715 to displace, squeezing the second spring 716. The bottom end of the reinforcement plate 715 is inserted into the reinforcement groove 717 to fix the block 707.

[0042] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent replacements or changes, should be covered by the protection scope of the present invention.

Claims

1. A method for detecting stress of an automobile leaf spring, characterized in that: The specific steps are as follows: Step 1: Using a detection device, the two end ears of the leaf spring body (5) are fixedly connected to the two pulleys (4) respectively through a fixing mechanism (6), and the output end of the electric push rod (3) is connected to the middle position of the leaf spring body (5) through a connecting mechanism (7); Step 2: symmetrically attaching a plurality of strain gauges (10) to the outer surface of the leaf spring of the leaf spring body (5); Step 3: Start the electric push rod (3) to apply a load to the leaf spring body (5), and the strain gauge (8) detects the strain value of the leaf spring body (5); The detection device comprises a base (1), the top of the base (1) is fixedly connected to a mounting frame (2), the electric push rod (3) is mounted on the top of the mounting frame (2), the two pulleys (4) are symmetrically slidably connected to the top of the base (1) and are located below the mounting frame (2), the strain gauge (8) is mounted on the top of the base (1), the outer wall of the strain gauge (8) is fixedly connected to a wire (9), and the strain gauge (10) is electrically connected to the strain gauge (8) via the wire (9).

2. The method for detecting stress of an automobile leaf spring according to claim 1, characterized in that: The fixing mechanism (6) comprises a displacement groove (601), wherein the displacement groove (601) is provided at the top end of the base (1); the pulley (4) is symmetrically slidably connected to the inner wall of the displacement groove (601); slide grooves (602) are symmetrically provided on both sides of the inner wall of the displacement groove (601); slide rods (603) are symmetrically fixedly connected to the outer wall of the pulley (4); the slide rods (603) are slidably connected to the inner wall of the slide groove (602); the bottom end of the pulley (4) is rotatably connected to a connecting rod (604); a rotating rod (605) is rotatably connected to the middle position of the bottom end of the inner wall of the displacement groove (601); the two ends of the rotating rod (605) are respectively connected to the two connecting rods (604); the top end of the pulley (4) is fixedly connected to A fixed plate (606), an outer wall of the fixed plate (606) is provided with an insertion hole (607), an interior of the pulley (4) is provided with a movable groove (608), an inner wall of the movable groove (608) is slidably connected to a movable frame (609), an outer wall of the movable frame (609) is fixedly connected to an insertion rod (610), an outer wall of the movable frame (609) is provided with a fixed groove (611), an interior of the pulley (4) is slidably connected to a fixed block (612) extending to the inner wall of the movable groove (608), an outer wall of the pulley (4) is rotatably connected to a first rotating block (614), one end of the first rotating block (614) is fixedly connected to a first threaded rod (613), and the first threaded rod (613) extends to the interior of the fixed block (612).

3. The method for detecting stress of an automobile leaf spring according to claim 2, characterized in that: The connecting mechanism (7) comprises a mounting seat (701), the mounting seat (701) being connected to the output end of the electric push rod (3), the inner wall of the mounting seat (701) being slidably connected to a vertical rod (702), the bottom end of the vertical rod (702) being fixedly connected to a clamping seat (703), the bottom end of the clamping seat (703) being fixedly connected to an upper clamping plate (704), the interior of the clamping seat (703) being slidably connected to a vertical rod (702) extending to the clamping seat (703) ) below the displacement plate (705), the outer wall of the displacement plate (705) is fixedly connected to a lower clamping plate (706), the interior of the clamping seat (703) is located on one side of the displacement plate (705) and is slidably connected to a clamping block (707), a first spring (708) is connected between the clamping block (707) and the clamping seat (703), the interior of the clamping seat (703) is located at the top of the clamping block (707) and is slidably connected to a push plate (709), the The clamping seat (703) is internally rotatably connected to a second threaded rod (710) that passes through the push plate (709); one end of the second threaded rod (710) is fixedly connected to a second rotating block (711); an outer wall of the clamping seat (703) is located above the second rotating block (711) and is rotatably connected to a third rotating block (712); one end of the third rotating block (712) is fixedly connected to a third threaded rod (713); an outer wall of the third threaded rod (713) is slidably connected to a positioning frame (714); the positioning frame (714) is slidably connected to the vertical rod (702) and the inside of the clamping seat (703); a reinforcing plate (715) is slidably connected to one side of the positioning frame (714) inside the clamping seat (703); a second spring (716) is connected between the reinforcing plate (715) and the clamping seat (703); a reinforcing groove (717) is provided at the top of the clamping block (707).

4. The method for detecting stress of an automobile leaf spring according to claim 2, characterized in that: The outer wall of the insertion rod (610) fits in with the inner wall of the insertion hole (607), and the inner wall of the movable groove (608) fits in with the outer wall of the movable frame (609).

5. The method for detecting stress of an automobile leaf spring according to claim 2, characterized in that: The inner wall of the fixing groove (611) fits with the outer wall of the fixing block (612); the outer wall of the fixing block (612) is provided with a first threaded hole, and the first threaded hole matches the first threaded rod (613).

6. The method for detecting stress of an automobile leaf spring according to claim 3, characterized in that: The outer wall of the displacement plate (705) is provided with ratchet teeth, and one end of the clamping block (707) is engaged with the ratchet teeth.

7. The method for detecting stress of an automobile leaf spring according to claim 3, characterized in that: The outer wall of the clamping block (707) is L-shaped, and the outer wall of the push plate (709) is provided with a second threaded hole, wherein the second threaded hole matches the second threaded rod (710).

8. The method for detecting stress of an automobile leaf spring according to claim 3, characterized in that: A third threaded hole is formed on the outer wall of the positioning frame (714), and the third threaded hole matches the third threaded rod (713). The outer wall of the vertical rod (702) fits the inner wall of the mounting seat (701). A slot is formed on the inner wall of the mounting seat (701), and one end of the positioning frame (714) fits into the slot.

9. The method for detecting stress of an automobile leaf spring according to claim 3, characterized in that: A slope is provided on one side of the reinforcement plate (715), and the bottom outer wall of the reinforcement plate (715) fits the inner wall of the reinforcement groove (717).

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