Equipment and method for automatically detecting semi-chord length of plate spring under set load

Abstract

The invention relates to an automatic detection device and method for the half chord length of a plate spring under a set load, and belongs to the technical field of plate spring detection.The automatic detection device comprises a device body, a workbench and an oil cylinder are installed on the device body, a pressure head fixing base is fixed to the lower end of the oil cylinder, a pressure sensor is fixed to the lower portion of the pressure head fixing base, and a pressure head A is installed below the pressure sensor; a lower die plate is fixed above the workbench, two sets of trolley assemblies are arranged on the lower die plate in a sliding mode, and the trolley assemblies support the plate spring through detection mandrels; the center of the lower template is connected with a positioning mandrel; a stay wire encoder is arranged right behind the center of the lower die plate, a fixing block is further installed on the trolley assembly, and the output end of the stay wire encoder is fixed to the fixing block. A pressure head B is further included; the semi-chord length of the plate spring is obtained by reading the distance from the output end of the stay wire encoder to the stay wire encoder, the semi-chord length parameter of the plate spring is specially detected in combination with the mechanical measurement unit, the precision error of manual measurement is eliminated, and the detection efficiency is improved.

Description

Technical Field

[0001] The invention relates to an automatic detection device and method for a half-chord length of a leaf spring under a set load, belonging to the technical field of leaf spring detection. Background Art

[0002] The half-chord length of the leaf spring is the distance from the center of the leaf spring to the eyelet hole on one side. When installing the leaf spring, the middle of the leaf spring is fixed to the axle by a U-bolt, one end of the leaf spring is connected to the front bracket by a pin, and the other end of the leaf spring is connected to the eyelet bracket by the rear end eye. The rear end of the leaf spring can swing freely. Therefore, the half-chord length directly affects whether the leaf spring can be installed normally and is an extremely important installation dimension.

[0003] However, at present, there is no equipment and measurement system specifically for detecting the half-chord length of leaf springs at home and abroad. The existing measurement method is to flatten the leaf spring on a leaf spring performance testing machine and use a tape measure to measure the distance from the leaf spring ear to the center bolt of the leaf spring. Since this measurement method requires manual operation, there is a large error in the measurement accuracy, resulting in different data measured by each person, which often leads to misjudgment and causes inconvenience for subsequent installation. Summary of the invention

[0004] In view of the above deficiencies in the prior art, the technical problem to be solved by the present invention is: to provide an automatic detection device and method for the half-chord length of a leaf spring under a set load, which can simulate the theoretical force form of a leaf spring of an automobile, and combine with a mechanical measurement unit to perform special detection on the half-chord length parameters of the leaf spring, thereby eliminating measurement accuracy errors and improving detection efficiency.

[0005] The automatic detection device for the half-chord length of a leaf spring under a set load of the present invention comprises a device body, which is a C-shaped structure, a workbench and a cylinder are installed on the device body, the cylinder is located above the workbench, a pressure head fixing seat is fixed at the lower end of the cylinder, a pressure sensor is fixed below the pressure head fixing seat, and a pressure head A is installed below the pressure sensor; A lower template is fixed above the workbench, and two sets of trolley assemblies are slidably arranged on the lower template. The trolley assembly is used to support the leaf spring to be tested. The two side ears of the leaf spring are provided with detection mandrels. The trolley assembly supports the leaf spring through the detection mandrel. When the leaf spring is tested, the detection mandrel is located on the vertical plane where the center of the trolley assembly is located; the center of the lower template is detachably connected with a positioning mandrel, and the positioning mandrel can cooperate with the pressure head A to locate the installation position of the lower template; a wire encoder is provided directly behind the center position of the lower template, and a fixed block is also installed on the trolley assembly. The fixed block is located on the vertical plane where the center of the trolley assembly is located, and the output end of the wire encoder is fixed on the fixed block; It also includes a pressing head B, which can cooperate with the pressing head A to make the center of the leaf spring coincide with the center of the lower template.

[0006] Preferably, the device body is installed with upper and lower guide rail slider assemblies, and the pressure head fixing seat is slidably connected to the device body through the upper and lower guide rail slider assemblies to ensure that the pressure head fixing seat can move up and down in the vertical direction.

[0007] Preferably, the pressure head A is provided with a conical hole, and the pressure head B is provided with a conical protrusion adapted to the conical hole; the bottom surface of the pressure head B is provided with a center bolt positioning hole, and the center bolt positioning hole is adapted to the center bolt installed in the center of the leaf spring.

[0008] Preferably, T-slots are provided on both sides of the lower template, and the lower template is connected to the workbench via the T-slots and T-bolts, and the position of the lower template on the workbench is adjustable.

[0009] Preferably, a transverse guide rail slider assembly is installed on the lower template, and the trolley assembly is slidably connected to the lower template via the transverse guide rail slider assembly.

[0010] Preferably, the positioning mandrel is provided with conical platforms at both ends, and a central positioning conical hole is provided at the center of the lower template. The conical platform at one end of the positioning mandrel is adapted to the central positioning conical hole, and the conical platform at the other end of the positioning mandrel is adapted to the conical hole on the pressure head A. Preferably, the trolley assembly includes a trolley fixing plate, which is fixed on the slider of the transverse guide rail slider assembly. A fixed shaft is provided in the center of the trolley fixing plate, and a bearing is sleeved on the fixed shaft. The trolley fixing plate is rotatably connected to the trolley rotating seat through the fixed shaft. Trolley vertical plates are installed on both sides of the trolley rotating seat. A V-shaped groove is opened in the center of the top of the trolley vertical plate, and a wear-resistant plate is installed on the V-shaped groove; the trolley assembly supports and pre-positions both ends of the leaf spring through the V-shaped groove on the trolley vertical plate.

[0011] Preferably, a through square hole is provided on the side of the pressure head A, so that after the test is completed, a crowbar can be inserted to separate the pressed pressure heads A and B.

[0012] The method for automatically detecting the half-chord length of a leaf spring under a set load of the present invention comprises the following steps: S1. Place the lower template on the workbench and move the two sets of trolley assemblies to the two sides of the workbench respectively; control the oil cylinder to move down close to the workbench, place the positioning mandrel between the pressure head A and the lower template, and place the tapered platforms at both ends of the positioning mandrel corresponding to the tapered hole on the pressure head A and the central positioning tapered hole of the lower template respectively; S2. The oil cylinder continues to move downward, so that the center of the pressure head A and the center of the lower template are on the same reference line, and then tighten the T-bolts that fix the lower template and the workbench to ensure that the lower template does not move during the test, and the center of the pressure head A and the lower template are still on the same reference line; S3, the oil cylinder moves upward, removes the positioning mandrel, and then inserts the detection mandrel into the ears on both sides of the leaf spring, so that the detection mandrels on both sides are respectively located in the V-grooves of the two sets of trolley assemblies for pre-positioning; S4. Place the pressure head B above the center bolt of the leaf spring, and position the pressure head B by matching the center bolt positioning hole with the center bolt, so that the conical protrusion on the pressure head B corresponds to the conical hole on the pressure head A; S5. The oil cylinder moves downward to tightly connect the pressure head A and the pressure head B. The trolley assembly drives the output end of the wire encoder to move. The two sets of trolley assemblies automatically align the center of the leaf spring so that the center of the leaf spring, the center of the pressure head A and the center of the lower template are all on the same reference line. The oil cylinder continues to move downward to press the leaf spring to a straight state and reach the measuring position. The system reads the distance from the output end of the wire encoder to the wire encoder, that is, the half-chord length of the leaf spring, and completes the measurement.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention makes the centers of the lower template and the pressure head A on the same reference line through the cooperation of the positioning core shaft and the pressure head A, and then makes the centers of the leaf spring, the pressure head A and the lower template on the same reference line through the cooperation of the pressure head A, the pressure head B and the center bolt on the leaf spring, and then obtains the half-chord length of the leaf spring by reading the distance from the output end of the wire encoder to the wire encoder; the present invention can simulate the theoretical force form of the automobile leaf spring, and in combination with the mechanical measurement unit, conduct special detection on the half-chord length parameter of the leaf spring, eliminate the precision error of artificial measurement, avoid misjudgment, and improve the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of the present invention; Figure 2 It is one of the structural schematic diagrams of the present invention; Figure 3 This is the second structural schematic diagram of the present invention; Figure 4 It is a left side view of the present invention; Figure 5 is a cross-sectional view of the pressure head A; Figure 6 is a cross-sectional view of the pressure head B.

[0015] In the figure: 1. Equipment body; 11. Cylinder; 12. Pressure head fixing seat; 13. Pressure sensor; 14. Pressure head A; 141. Conical hole; 142. Square hole; 15. Pressure head B; 151. Center bolt positioning hole; 152. Conical protrusion; 16. Upper and lower guide rail slider assembly; 2. Trolley assembly; 21. Trolley vertical plate; 211. Wear-resistant plate; 22. Trolley rotating seat; 23. Trolley fixing plate; 231. Fixed shaft; 232. Fixed block; 3. Lower template; 31. Horizontal guide rail slider assembly; 32. T-slot; 4. Workbench; 5. Positioning mandrel; 6. Leaf spring; 61. Center bolt; 62. Detection mandrel; 7. Wire draw encoder; 71. Wire draw encoder output end. DETAILED DESCRIPTION

[0016] like Figures 1 to 6 As shown, the automatic detection device for the half-chord length of the leaf spring under a set load described in this embodiment is realized by the following technical scheme: it includes an equipment body 1, the equipment body 1 is a C-shaped structure, a workbench 4 and a cylinder 11 are installed on the equipment body 1, the cylinder 11 is located above the workbench 4, a pressure head fixing seat 12 is fixed at the lower end of the cylinder 11, a pressure sensor 13 is fixed below the pressure head fixing seat 12, and a pressure head A14 is installed below the pressure sensor 13; a lower template 3 is fixed above the workbench 4, two sets of trolley assemblies 2 are slidably arranged on the lower template 3, the trolley assembly 2 is used to support the leaf spring 6 to be detected, and a detection core shaft 62 is passed through the ears on both sides of the leaf spring 6, and the trolley assembly The leaf spring 6 is supported by the detection mandrel 62. When the leaf spring 6 is detected, the detection mandrel 62 is located on the vertical plane where the center of the trolley assembly 2 is located. The center of the lower template 3 is detachably connected with a positioning mandrel 5, which can cooperate with the pressure head A14 to locate the installation position of the lower template 3. A wire encoder 7 is provided just behind the center of the lower template 3. The trolley assembly 2 is also equipped with a fixed block 232, which is located on the vertical plane where the center of the trolley assembly 2 is located. The fixed block 232 is fixed with the output end 71 of the wire encoder. The trolley assembly 2 also includes a pressure head B15, which can cooperate with the pressure head A14 to make the center of the leaf spring 6 coincide with the center of the lower template 3.

[0017] In this embodiment, the upper and lower guide rail slider assemblies 16 are installed on the equipment body 1, and the pressure head fixing seat 12 is slidably connected to the equipment body 1 through the upper and lower guide rail slider assemblies 16 to ensure that the pressure head fixing seat 12 can move up and down in the vertical direction; the pressure head A14 is provided with a conical hole 141, and the pressure head B15 is provided with a conical protrusion 152 adapted to the conical hole 141; the bottom surface of the pressure head B15 is provided with a center bolt positioning hole 151, and the center bolt positioning hole 151 is adapted to the center bolt 61 installed in the center of the leaf spring 6; T-slots 32 are provided on both sides of the lower template 3, and the lower template 3 is connected to the workbench 4 through the T-slots 32 and T-bolts, and the position of the lower template 3 on the workbench 4 is adjustable; the lower template 3 is installed with a transverse guide rail slider assembly 31, and the trolley assembly 2 is slidably connected to the lower template 3 through the transverse guide rail slider assembly 31.

[0018] The positioning mandrel 5 is provided with conical platforms at both ends, and the center of the lower template 3 is provided with a central positioning conical hole. The conical platform at one end of the positioning mandrel 5 is adapted to the central positioning conical hole, and the conical platform at the other end of the positioning mandrel 5 is adapted to the conical hole on the pressure head A14. The trolley assembly 2 includes a trolley fixed plate 23, which is fixed on the slider of the horizontal guide rail slider assembly 31. The center of the trolley fixed plate 23 is provided with a fixed shaft 231, and the fixed shaft 231 is sleeved with a bearing. The trolley fixed plate 23 is rotatably connected to the trolley rotating seat 22 through the fixed shaft 231 to avoid the central axis of the lifting ears on both sides of the leaf spring 6 being not parallel and affecting the detection; the trolley vertical plates 21 are installed on both sides of the trolley rotating seat 22, and a V-shaped groove is opened in the top center of the trolley vertical plate 21, and a wear-resistant plate 211 is installed on the V-shaped groove; the trolley assembly 2 supports and pre-positions the two ends of the leaf spring 6 through the V-shaped groove on the trolley vertical plate 21. A through square hole 142 is provided on the side of the pressure head A14, so that after the test is completed, a crowbar can be inserted to separate the pressed pressure head A14 and the pressure head B15.

[0019] The method for automatically detecting the half-chord length of a leaf spring under a set load described in this embodiment includes the following steps: S1, place the lower template 3 on the workbench 4, and move the two sets of trolley assemblies 2 to the two sides of the workbench 4 respectively; control the oil cylinder 11 to move down close to the workbench 4, place the positioning mandrel 5 between the pressure head A14 and the lower template 3, and make the tapered platforms at both ends of the positioning mandrel 5 correspond to the tapered hole 141 on the pressure head A14 and the central positioning tapered hole of the lower template 3 respectively; S2, the oil cylinder 11 continues to move downward, so that the center of the pressure head A14 and the center of the lower template 3 are on the same reference line, and then the T-bolts fixing the lower template 3 and the workbench 4 are tightened to ensure that the lower template 3 does not move during the test, and the centers of the pressure head A14 and the lower template 3 are still on the same reference line; S3, the oil cylinder 11 moves upward, the positioning mandrel 5 is removed, and then the detection mandrel 62 is inserted into the ears on both sides of the leaf spring 6, so that the detection mandrel 62 on both sides is respectively located in the V-grooves of the two sets of trolley assemblies 2 for pre-positioning; S4, place the pressure head B15 above the center bolt 61 of the leaf spring 6, and position the pressure head B15 by matching the center bolt positioning hole with the center bolt 61, so that the conical protrusion 152 on the pressure head B15 corresponds to the conical hole 141 on the pressure head A14; S5, the oil cylinder 11 moves downward to tightly connect the pressure head A14 with the pressure head B15, and the trolley assembly 2 drives the output end 71 of the wire encoder to move. The two sets of trolley assemblies 2 automatically align the center of the leaf spring 6, so that the center of the leaf spring 6, the center of the pressure head A14 and the center of the lower template 3 are all on the same reference line; the oil cylinder 11 continues to move downward to press the leaf spring 6 to a straight state and reach the measuring position. The system reads the distance from the output end 71 of the wire encoder to the wire encoder 7, that is, the half-chord length of the leaf spring 6, and completes the measurement.

[0020] Meanwhile, during the detection process, the load applied to the leaf spring 6 can be detected by the pressure sensor 13, the corresponding deformation and arc height parameters of the leaf spring 6 can be detected by the stroke of the oil cylinder 11, and the chord length parameters can be calculated by the measured half-chord length.

Claims

1. An automatic detection device for the half-chord length of a leaf spring under a set load, characterized in that: The device comprises a device body (1), the device body (1) is a C-shaped structure, a workbench (4) and a cylinder (11) are mounted on the device body (1), the cylinder (11) is located above the workbench (4), a pressure head fixing seat (12) is fixed at the lower end of the cylinder (11), a pressure sensor (13) is fixed below the pressure head fixing seat (12), and a pressure head A (14) is mounted below the pressure sensor (13); A lower template (3) is fixed above the workbench (4), and two sets of trolley assemblies (2) for supporting leaf springs (6) are slidably arranged on the lower template (3), and detection mandrels (62) are inserted into the lifting ears on both sides of the leaf spring (6). The trolley assembly (2) supports the leaf spring (6) through the detection mandrel (62), and when the leaf spring (6) is detected, the detection mandrel (62) is located on the vertical plane where the center of the trolley assembly (2) is located; a positioning mandrel (5) is detachably connected to the center of the lower template (3); a wire encoder (7) is provided directly behind the center of the lower template (3), and a fixed block (232) is also installed on the trolley assembly (2), and the fixed block (232) is located on the vertical plane where the center of the trolley assembly (2) is located, and the fixed block (232) is fixed with a wire encoder output end (71); It also includes a pressing head B (15), which can cooperate with the pressing head A (14) to make the center of the leaf spring (6) coincide with the center of the lower template (3).

2. The automatic detection device for the half-chord length of a leaf spring under a set load according to claim 1, characterized in that: The device body (1) is provided with an upper and lower guide rail slider assembly (16), and the pressure head fixing seat (12) is slidably connected to the device body (1) via the upper and lower guide rail slider assembly (16).

3. The automatic detection device for the half-chord length of a leaf spring under a set load according to claim 1, characterized in that: The pressure head A (14) is provided with a conical hole (141), and the pressure head B (15) is provided with a conical protrusion (152) adapted to the conical hole (141); the bottom surface of the pressure head B (15) is provided with a center bolt positioning hole (151), and the center bolt positioning hole (151) is adapted to the center bolt (61) installed in the center of the leaf spring (6).

4. The automatic detection device for the half-chord length of a leaf spring under a set load according to claim 1, characterized in that: The lower template (3) is provided with T-shaped slots (32) on both sides. The lower template (3) is connected to the workbench (4) via the T-shaped slots (32) and T-shaped bolts. The position of the lower template (3) on the workbench (4) is adjustable.

5. The automatic detection device for the half-chord length of a leaf spring under a set load according to claim 4, characterized in that: A transverse guide rail slider assembly (31) is installed on the lower template (3), and the trolley assembly (2) is slidably connected to the lower template (3) via the transverse guide rail slider assembly (31).

6. The automatic detection device for the half-chord length of a leaf spring under a set load according to claim 3, characterized in that: The positioning mandrel (5) is provided with conical platforms at both ends, and a central positioning conical hole is provided at the center of the lower template (3). The conical platform at one end of the positioning mandrel (5) is adapted to the central positioning conical hole, and the conical platform at the other end of the positioning mandrel (5) is adapted to the conical hole (141) on the pressure head A (14).

7. The automatic detection device for the half-chord length of a leaf spring under a set load according to claim 1, characterized in that: The trolley assembly (2) comprises a trolley fixing plate (23), the trolley fixing plate (23) being fixed on a slider of a transverse guide rail slider assembly (31), a fixing shaft (231) being provided at the center of the trolley fixing plate (23), a bearing being sleeved on the fixing shaft (231), the trolley fixing plate (23) being rotatably connected to the trolley rotating seat (22) via the fixing shaft (231), trolley vertical plates (21) being installed on both sides of the trolley rotating seat (22), a V-shaped groove being provided at the center of the top of the trolley vertical plate (21), and a wear-resistant plate (211) being installed on the V-shaped groove; the trolley assembly (2) supports and pre-positions both ends of the leaf spring (6) via the V-shaped groove on the trolley vertical plate (21).

8. The automatic detection device for the half chord length of a leaf spring under a set load according to claim 3, characterized in that: A through-going square hole (142) is provided on the side of the pressure head A (14).

9. A method for automatically detecting the half-chord length of a leaf spring under a set load, characterized in that: The following steps are involved: S1, placing the lower template (3) on the workbench (4), and moving the two sets of trolley assemblies (2) to the two sides of the workbench (4); controlling the oil cylinder (11) to move downward close to the workbench (4), placing the positioning mandrel (5) between the pressure head A (14) and the lower template (3), and aligning the conical platforms at both ends of the positioning mandrel (5) with the conical holes (141) on the pressure head A (14) and the central positioning conical hole of the lower template (3); S2. The oil cylinder (11) continues to move downward until the center of the pressure head A (14) and the center of the lower template (3) are on the same reference line, and then the T-bolts fixing the lower template (3) and the workbench (4) are tightened to ensure that the lower template (3) does not move during the test and the centers of the pressure head A (14) and the lower template (3) are still on the same reference line; S3, the oil cylinder (11) moves upward, the positioning mandrel (5) is removed, and then the detection mandrel (62) is inserted into the ears on both sides of the leaf spring (6), so that the detection mandrels (62) on both sides are respectively located in the V-grooves of the two sets of trolley assemblies (2) for pre-positioning; S4, placing the pressure head B (15) above the center pin (61) of the leaf spring (6), and positioning the pressure head B (15) by cooperating with the center pin positioning hole and the center pin (61), so that the conical protrusion (152) on the pressure head B (15) corresponds to the conical hole (141) on the pressure head A (14); S5, the oil cylinder (11) moves downward to tightly connect the pressure head A (14) and the pressure head B (15), and the trolley assembly (2) drives the output end (71) of the cable encoder to move. The two sets of trolley assemblies (2) automatically align the center of the leaf spring (6) so that the center of the leaf spring (6), the center of the pressure head A (14) and the center of the lower template (3) are all on the same reference line; the oil cylinder (11) continues to move downward to press the leaf spring (6) to a straight state to reach the measuring position, and the system reads the distance from the output end (71) of the cable encoder to the cable encoder (7), that is, the half chord length of the leaf spring (6), and the measurement is completed.

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