Automobile seat frame fatigue loading test mechanism

Abstract

The present invention relates to a fatigue loading test mechanism for a car seat frame, comprising: a force cylinder for pushing and pulling the seat frame; a proportional valve installed at the tail of the force cylinder, the valve port of the proportional valve connected to the air vent of the force cylinder through an air pipe; a force sensor and a displacement sensor installed on the cylinder rod of the force cylinder; a control system, which controls the opening of the proportional valve according to the force value and displacement value fed back in real time by the force sensor and the displacement sensor, and adjusts the loading force, loading speed, and loading stroke of the force cylinder in real time. The present invention uses the cylinder as the actuating component for applying the load, and controls the force speed, accuracy, extreme value, and stroke of the cylinder extension and retraction process by controlling the proportional valve; the fatigue loading test of the seat frame can be realized stably and reliably for a long time with high-frequency loading cycles and high-precision loading force, so that the loading test process can be completed relatively quickly, accurately, and reliably.

Description

Technical Field

[0001] The invention relates to the technical field of automobile seat testing, in particular to a fatigue loading testing mechanism for an automobile seat frame. Background Art

[0002] At present, the automobile seat frame fatigue testing machine uses manual pressure reducing valves and throttle valves to control the force speed, force accuracy and force stroke, which cannot take into account the construction of fatigue loading tests, the flexibility to adapt to different test standards and the control accuracy. In the fatigue test process with high test standards, servo electric cylinders are used to implement the above process. Although it can meet the above requirements, it requires higher fatigue mechanism construction and maintenance costs, and its service life is also lower than that of cylinder force components. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a fatigue loading test mechanism for a car seat frame to overcome the above-mentioned shortcomings.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a fatigue loading test mechanism for a car seat frame, comprising:

[0005] The force cylinder is used to push and pull the seat frame;

[0006] The proportional valve is installed at the tail of the force cylinder, and the valve port of the proportional valve is connected to the vent hole of the force cylinder through an air pipe;

[0007] The force sensor and the displacement sensor are mounted on the cylinder rod of the force cylinder;

[0008] The control system controls the opening of the proportional valve according to the force and displacement values ​​fed back by the force sensor and the displacement sensor in real time, and adjusts the loading force, loading speed and loading stroke of the force cylinder in real time.

[0009] Based on the above solution, the force-applying cylinder includes:

[0010] A first force-applying cylinder for loading the backrest of the seat frame in a positive X direction;

[0011] A second force-applying cylinder for loading the backrest of the seat frame in the Y direction;

[0012] A third force-applying cylinder for loading the seat pan side of the seat frame in the Y1 direction;

[0013] a fourth force-applying cylinder for loading the seat pan of the seat frame in a positive Z direction;

[0014] The X-direction loading of the first force cylinder and the Y-direction loading of the second force cylinder constitute a set of AC and DC force structures; the Y1-direction loading of the third force cylinder and the Z-direction loading of the fourth force cylinder constitute a set of AC and DC force structures.

[0015] On the basis of the above scheme, there is a backrest tooling as a coupling carrier for transmitting the loading force for X-direction loading and Y-direction loading; there is a prosthetic buttocks as a coupling carrier for transmitting the loading force for Y1-direction loading and Z-direction loading.

[0016] On the basis of the above scheme, the backrest tooling is provided with a U-shaped side moving frame, a transverse linear slide rail is installed on the back of the side moving frame, a slider connected to the backrest tooling is slidably assembled on the transverse linear slide rail, elastic rubber columns are installed on the inner sides of both ends of the side moving frame, and pin shaft seats are respectively installed on the back of the backrest tooling and one end of the side moving frame corresponding to the second force cylinder.

[0017] Based on the above solution, the ends of the first force-applying cylinder and the second force-applying cylinder are provided with connecting rods, and the connecting rods are connected to corresponding pin shaft seats through pin shafts.

[0018] Based on the above scheme, a prosthetic buttocks mounting plate assembly is installed on the prosthetic buttocks, and the prosthetic buttocks mounting plate assembly includes an upper plate, a lower plate, and a connecting plate. The upper plate and the lower plate are assembled and connected by transverse sliding. The connecting plate is installed on the prosthetic buttocks, the lower plate is hinged on the connecting plate, and a mounting seat is installed on the connecting plate.

[0019] Based on the above scheme, a transverse slide rail is fixed on the top surface of the lower plate, and a slider corresponding to the transverse slide rail is fixed on the bottom surface of the upper plate. The transverse slide rail and the slider are slidably matched to realize the transverse sliding assembly connection between the upper plate and the lower plate.

[0020] Based on the above solution, the end of the third force-applying cylinder is connected to the mounting seat through a pin shaft. The end of the fourth force-applying cylinder is provided with a mounting plate, and the mounting plate is fixedly connected to the upper plate.

[0021] Compared with the prior art, the present invention has the following beneficial effects: the present invention utilizes a cylinder as an actuating component for applying a load, and controls the force application speed, accuracy, extreme value and stroke of the cylinder extension and retraction process by controlling a proportional valve; it can stably and reliably perform fatigue loading tests on the seat frame for a long time with high-frequency loading cycles and high-precision loading forces, thereby completing the loading test process in a relatively short, accurate and reliable manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure after four loading adjustment mechanisms of the present invention are installed on the base;

[0023] Figure 2 It is a three-dimensional schematic diagram of four loading adjustment mechanisms of the present invention applying force to a seat frame;

[0024] Figure 3 It is a three-dimensional schematic diagram of the connection between four force-applying cylinders, a backrest tooling, and a prosthetic buttocks of the present invention;

[0025] Figure 4 It is a three-dimensional schematic diagram of four force-applying cylinders of the present invention applying force to a seat frame;

[0026] Figure 5 for Figure 4 The side view schematic diagram of Y-direction loading and Y1-direction loading is shown in the figure;

[0027] Figure 6 for Figure 4 The side view schematic diagram of X-direction loading and Z-direction loading is shown in the figure;

[0028] Figure 7 for Figure 4 The three-dimensional schematic diagram of X-direction loading and Y-direction loading is shown in FIG.

[0029] Figure 8 for Figure 4 The three-dimensional schematic diagram of Y1-direction loading and Z-direction loading is shown in the figure;

[0030] Fig. 9 This is a schematic diagram of the third force-applying cylinder of the present invention applying force to the prosthetic buttocks;

[0031] Fig.10 This is a schematic diagram of the structure of the artificial buttocks mounting plate assembly of the present invention;

[0032] Fig.11 This is a schematic diagram of the structure of the fourth force-applying cylinder of the present invention;

[0033] Fig.12 This is a schematic diagram of the structure of the third force-applying cylinder of the present invention;

[0034] Fig.13 This is a schematic diagram of the structure of the second force-applying cylinder of the present invention and a schematic diagram of the backrest tooling connection;

[0035] Fig.14 This is a schematic diagram of the structure of the second force-applying cylinder of the present invention;

[0036] Fig.15 It is a schematic diagram of the backrest tooling structure of the present invention.

[0037] The numbers in the figure are: base 1, bottom plate 2, first loading adjustment mechanism 3, second loading adjustment mechanism 4, fourth loading adjustment mechanism 5, cross beams 6, 7, 11, first guide assembly 8, first transmission assembly 9, variable frequency reduction motor 10, tailstock 12, 13, 14, 32, proportional valve 15, 16, 17, 62, force sensor 18, displacement sensor 19, connecting rod 20, backrest tooling 21, horizontal linear slide rail 22, slider 23, side moving frame 24, elastic rubber column 25, upper frame 26 , transverse moving slide 27, interface plate 28, Z-axis adjustment plate 29, second guide assembly 30, second transmission assembly 31, false buttocks 33, first force cylinder 34, first force cylinder 35, pins 36, 57, pin seats 37, 38, fourth force cylinder 39, third force cylinder 40, false buttocks mounting plate assembly 41, upper plate 42, lower plate 43, transverse slide rail 44, third loading adjustment mechanism 45, connecting plate 46, mounting seat 47, backrest 48, seat basin 49, fixed tooling 50. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0040] Reference Figures 1 to 15 It can be seen that this embodiment provides a fatigue loading test mechanism for a car seat frame, the car seat frame includes a backrest 48 and a seat pan 49, and the test mechanism includes a mechanical part and an electrical control part.

[0041] Reference Figure 1 , Figure 2 The mechanical part includes four loading adjustment mechanisms, namely, for the positive loading of the seat frame backrest 48 ( Figure 6 The first loading adjustment mechanism 3 for the X-direction loading of the seat frame backrest 48 ( Figure 5 The second loading adjustment mechanism 4 for Y-direction loading) is for lateral loading of the seat frame seat pan 49 ( Figure 5The third loading adjustment mechanism 45 for Y1-direction loading) and the positive loading ( Figure 6 A fourth loading adjustment mechanism 5 for Z-direction loading).

[0042] Reference Figures 3 to 8 , using pneumatic servo technology to perform fatigue loading tests on the backrest 48 and seat pan 49 of the car seat frame, the fatigue loading directions are composed of X-direction loading, Y-direction loading, Y1-direction loading, and Z-direction loading. The X-direction loading is centered on the first force cylinder 34, and is a push and pull loading test of a specific loading force curve on the backrest 48; the Y-direction loading is centered on the second force cylinder 35, and is a push and pull loading test of a specific lateral loading force curve on the backrest 48; the Y1-direction loading is centered on the third force cylinder 40, and is a push and pull loading test of a specific lateral loading force curve on the seat pan 49; the Z-direction loading is centered on the fourth force cylinder 39, and is a downward pressure and release loading test of a specific loading force curve on the seat pan 49.

[0043] like Figure 7 , Figure 8 As shown, X-direction loading and Y-direction loading constitute a group of AC-DC force structures, Y1-direction loading and Z-direction loading constitute a group of AC-DC force structures, and the test mechanism is divided into two groups of AC-DC axes to realize the load synchronization loading process. When fatigue loading is performed on the backrest 48 and the seat pan 49, the seat deformation generated when one force unit loads the seat will not have additional effects on other force units, thereby improving the loading accuracy and measurement accuracy, while eliminating the radial force on each connection point of the force unit assembly, increasing the service life of each component of the force unit assembly, and also improving the reliability and stability of the overall operation of the force unit.

[0044] Reference Figure 1 , Figure 2 , Figure 4 The above four loading adjustment mechanisms are installed on a base 1, on which a bottom plate 2 is installed, and the car seat frame is installed on the bottom plate 2 through a fixing fixture 50. The installed car seat frame, the fixing fixture 50 and the bottom plate 2 form a rigid component that can overcome external forces and maintain stability and tightness during the entire fatigue loading process. The base 1 and each unit component installed on the base 1 form a test bench mechanism with a certain weight with the base 1. The self-weight of the mechanism can meet the requirements of each force-applying unit when fatigue loading is applied to the car seat frame, and the inertia of the force-applying unit during operation will not cause vibration and movement of the entire mechanism, so as to maintain stability during the entire fatigue loading process.

[0045] Reference Figures 2 to 4The above-mentioned first loading and adjusting mechanism 3 and second loading and adjusting mechanism 4 both include crossbeams 6, 7, 11, a first transmission assembly 9, and a first guide assembly 8. The first guide assembly 8 is installed on the base 1. The first transmission assembly 9 is driven by a variable frequency reduction motor 10 to drive the crossbeam to move and adjust the position along the first guide assembly 8. The first loading and adjusting mechanism 3 has a crossbeam 11 for fixing the tail seat 12 of the first force cylinder 34 of the first loading and adjusting mechanism 3. The second loading and adjusting mechanism 4 has two upper and lower crossbeams 6 and 7. The upper crossbeam 6 is used to fix the tail seat 13 of the second force cylinder 35 of the second loading and adjusting mechanism 4, and the lower crossbeam 7 is used to fix the tail seat 17 of the third force cylinder 40 of the third loading and adjusting mechanism 45. The fourth loading adjustment mechanism 5 is installed on the upper frame 26 of the base 1, and two lateral movable slides 27 for adjusting the fourth force cylinder 39 are installed on the upper frame 26. Z-direction adjustment plates 29 are fixedly installed on both sides of the fourth force cylinder 39. The Z-direction adjustment plate 29 is equipped with a second guide assembly 30 driven by the second transmission assembly 31. The second guide assembly 30 is installed on the lateral movable slide 27 on the corresponding side through the interface plate 28.

[0046] Proportional valves 15, 16, 17, 62 are installed at the tail of the first force cylinder 34, the second force cylinder 35, the third force cylinder 40, and the fourth force cylinder 39. The valve ports of the proportional valves are connected to the air vents of the cylinders by air pipes, and force sensors 18 and displacement sensors 19 are installed on the cylinder rods of the cylinders.

[0047] Reference Fig.13 , Fig.14 , Fig.15 The backrest fixture 21 is a carrier for transmitting the loading force in the X-direction and Y-direction loading. The backrest fixture 21 is provided with a U-shaped side moving frame 24, and a transverse linear slide rail 22 is installed on the back of the side moving frame 24. The slider 23 connected to the backrest fixture 21 is slidably mounted on the transverse linear slide rail 22. Elastic rubber columns 25 are installed on the inner sides of both ends of the side moving frame 24. Pin seats 37 and 38 are installed on the back of the backrest fixture 21 and the end of the side moving frame 24 corresponding to the second force cylinder, respectively. The ends of the first force cylinder 34 and the second force cylinder 35 are provided with a connecting rod 20, and the connecting rod 20 is connected to the corresponding pin seats 37 and 38 through a pin 36. When the seat frame backrest 48 is loaded and moved, the backrest fixture 21 is driven by the connecting rod 20 on the cylinder end force sensor, and the rubber column 25 on the backrest fixture 21 contacts the seat frame backrest 48 to complete the transmission of the load force. While transmitting force, it can adapt to the deformation displacement of the seat when it is subjected to force, ensuring that the force value is not distorted and fatigue damage will not occur due to the inability to adapt to the deformation during the test.

[0048] The artificial buttocks 33 are the carriers for transmitting loading forces in the Y1 direction and the Z direction. The artificial buttocks 33 are processed and formed according to the shape and weight of the human buttocks. When conducting fatigue load tests, the outer surface of the artificial buttocks 33 model is covered with fabric of specific material.

[0049] Reference Fig.10 , Fig.11 A fake hip mounting plate assembly 41 is installed on the fake hip 33, and the fake hip mounting plate assembly 41 includes an upper plate 42, a lower plate 43, and a transverse slide rail 44. The transverse slide rail 44 is fixed to the top surface of the lower plate 43, and a slider corresponding to the transverse slide rail is fixed to the bottom surface of the upper plate 42. The upper plate 42 and the lower plate 43 are connected by sliding cooperation between the transverse slide rail 44 and the slider. A connecting plate 46 is installed on the fake hip 33, and the lower plate 43 is hinged on the connecting plate 46, and a mounting seat 47 is installed on the connecting plate 46.

[0050] Reference Fig. 9 , Fig.12 The end of the third force cylinder 40 is connected to the mounting seat 47 through a pin 57, which can transmit force and adapt to displacement. The end of the fourth force cylinder 39 is provided with a mounting plate 56, which is fixedly connected to the upper plate 42, so that the fourth force cylinder 39 on the seat frame seat basin 49 is connected to the laterally free buttocks 33.

[0051] The above content describes the mechanical part of the loading test mechanism. The electrical control part of the pneumatic servo fatigue loading mechanism of the car seat frame is also the key to the high-frequency and precise loading of the loading mechanism. The electrical control part mainly collects the loading force and displacement, and controls the opening of the proportional valve through calculation, so that the force cylinder can load according to the preset loading curve (a curve composed of three elements: loading force, loading speed, and time).

[0052] The proportional valve control cable is connected to the electronic control system of the fatigue loading test mechanism. The DC power supply module in the control box provides driving power for the proportional valve, and the analog output control module provides the proportional valve with an electrical signal to control the proportional valve opening. Different electrical signal outputs can enable the proportional valve to adjust the loading speed and loading stroke of the force cylinder in real time according to the force value and displacement value fed back by the force cylinder in real time, so that the force cylinder can complete a complete load application process and meet the functions of force control accuracy and position control accuracy in this process. The proportional valve is the core of the force cylinder unit to realize pneumatic servo control. During the loading test, by comparing the deviation of the loading force and loading speed with the preset curve in real time, the DA output unit in the control system adjusts the proportional valve in real time, so that the actual loading test process is consistent with the preset curve, and the fatigue durability test of the seat frame is completed under the conditions of high precision and rapid response.

Claims

1. Automobile seat frame fatigue loading test mechanism, characterized in that: include: The force cylinder is used to push and pull the seat frame; The proportional valve is installed at the tail of the force cylinder, and the valve port of the proportional valve is connected to the vent hole of the force cylinder through an air pipe; The force sensor and the displacement sensor are mounted on the cylinder rod of the force cylinder; The control system controls the opening of the proportional valve according to the force and displacement values ​​fed back by the force sensor and the displacement sensor in real time, and adjusts the loading force, loading speed and loading stroke of the force cylinder in real time.

2. The automobile seat frame fatigue loading test mechanism according to claim 1, characterized in that: The force-applying cylinder comprises: A first force-applying cylinder for loading the backrest of the seat frame in a positive X direction; A second force-applying cylinder for loading the backrest of the seat frame in the Y direction; A third force-applying cylinder for loading the seat pan side of the seat frame in the Y1 direction; a fourth force-applying cylinder for loading the seat pan of the seat frame in a positive Z direction; The X-direction loading of the first force cylinder and the Y-direction loading of the second force cylinder constitute a set of AC and DC force structures; the Y1-direction loading of the third force cylinder and the Z-direction loading of the fourth force cylinder constitute a set of AC and DC force structures.

3. The automobile seat frame fatigue loading test mechanism according to claim 2, characterized in that: There is a backrest tooling as a coupling carrier for transmitting loading forces in X-direction loading and Y-direction loading; The artificial buttocks serve as a coupling carrier for transmitting loading forces in the Y1 direction and the Z direction.

4. The automobile seat frame fatigue loading test mechanism according to claim 3, characterized in that: The backrest tooling is provided with a U-shaped side moving frame, a transverse linear slide rail is installed on the back of the side moving frame, a slider connected to the backrest tooling is slidably assembled on the transverse linear slide rail, elastic rubber columns are installed on the inner sides of both ends of the side moving frame, and pin seats are respectively installed on the back of the backrest tooling and one end of the side moving frame corresponding to the second force cylinder.

5. The automobile seat frame fatigue loading test mechanism according to claim 4, characterized in that: The ends of the first force-applying cylinder and the second force-applying cylinder are provided with connecting rods, and the connecting rods are connected to corresponding pin shaft seats through pin shafts.

6. The automobile seat frame fatigue loading test mechanism according to claim 3, characterized in that: The artificial buttocks are equipped with an artificial buttocks mounting plate assembly, which includes an upper plate, a lower plate, and a connecting plate. The upper plate and the lower plate are assembled and connected in a transverse sliding manner. The connecting plate is installed on the artificial buttocks, the lower plate is hinged on the connecting plate, and a mounting seat is installed on the connecting plate.

7. The automobile seat frame fatigue loading test mechanism according to claim 6, characterized in that: A transverse slide rail is fixed on the top surface of the lower plate, and a slider corresponding to the transverse slide rail is fixed on the bottom surface of the upper plate. The transverse slide rail and the slider cooperate with each other to realize the transverse sliding assembly connection between the upper plate and the lower plate.

8. The automobile seat frame fatigue loading test mechanism according to claim 6, characterized in that: The end of the third force-applying cylinder is connected to the mounting seat through a pin shaft.

9. The automobile seat frame fatigue loading test mechanism according to claim 6, characterized in that: The end of the fourth force-applying cylinder is provided with a mounting plate, and the mounting plate is fixedly connected to the upper plate.

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