Auxiliary device for calibrating impact speed of headrest and calibration method

Abstract

The invention relates to the technical field of vehicle seat impact testing, and provides an auxiliary device for headrest impact speed calibration and a calibration method. The auxiliary device for calibrating the impact speed of the headrest is arranged on a headrest impact test bed and comprises a fixed frame, a supporting frame and a mounting plate, the supporting frame is connected to the fixed frame through the energy absorption piece. The mounting plate is connected to the supporting frame in a turnover mode, one side of the mounting plate is provided with a buffering energy-absorbing material used for buffering a ball head of the impact test bed, and the hardness of the buffering energy-absorbing material is the same as or tends to be the same as that of an energy-absorbing piece in the headrest to be tested. According to the auxiliary device for calibrating the impact speed of the headrest, material waste and damage to the emitter and the auxiliary device in the impact process can be reduced, and the impact condition of the headrest in the actual use function can be simulated more truly; and meanwhile, the multi-angle requirements of different working conditions such as linear impact, pendulum impact and free flight can be met, and the use universality can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle seat impact testing, and in particular to an auxiliary device for calibrating a headrest impact velocity. The present invention also relates to a method for calibrating a headrest impact velocity based on the auxiliary device for calibrating a headrest impact velocity. Background Art

[0002] When calibrating the speed measuring device of the impact test bench, under the same launch speed, different air pressure values, and different impact angles, the equipment will produce different speeds. In order to accurately obtain the impact speed required for the test, the equipment needs to repeatedly impact at different launch speeds. After reaching the stable speed required for the test, the launch speed at this moment is recorded.

[0003] In the prior art, during the speed calibration of the headrest impact test bench, the seat frame and the foam material arranged on the seat frame are usually used, and the foam material is used as a buffer to test the curve. During the operation, the seat is relatively cumbersome to fix, and it needs to be fixed to the fixture, and then the fixture is adjusted to place it in the appropriate impact position. It takes multiple rounds to get the target speed. After several impacts, the seat frame and foam are severely damaged and cannot be reused, which not only causes a huge waste of materials, but also causes certain damage to the ball head and the launcher. Summary of the invention

[0004] In view of this, the present invention aims to provide an auxiliary device for headrest impact velocity calibration, so as to solve the problems of material waste and easy damage to equipment during the velocity calibration process.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] An auxiliary device for calibrating the impact velocity of a headrest is provided on a headrest impact test bench, and the auxiliary device comprises a fixing frame, a supporting frame and a mounting plate;

[0007] The support frame is connected to the fixed frame via an energy absorbing member;

[0008] The mounting plate is flippably connected to the support frame, and a buffering energy-absorbing material for buffering the ball head of the headrest impact test bench is provided on one side of the mounting plate. The buffering energy-absorbing material has the same or nearly the same hardness as the energy-absorbing part in the headrest to be tested.

[0009] Furthermore, the energy absorbing member includes a plurality of springs arranged at intervals along the circumference of the fixing frame, and two ends of each of the springs are respectively connected to the fixing frame and the supporting frame.

[0010] Furthermore, the support frame is provided with a driving device for driving the mounting plate to rotate.

[0011] Furthermore, an angle display is provided on the mounting plate, and the angle display is used to display the angle formed between the mounting plate and the supporting frame.

[0012] Furthermore, a universal wheel is provided at the bottom of the support frame; and / or a magnetic fixing member is provided at the bottom of the support frame.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] The auxiliary device for headrest impact velocity calibration of the present invention enables the support frame to be connected to the fixed frame through the energy absorbing member, which can play a buffering role in the process of velocity calibration of the ball head impacting the buffering energy absorbing material, and combined with the buffering energy absorbing material arranged on one side of the mounting plate, it can absorb most of the energy in the impact process, reduce the damage to the transmitter and auxiliary device and the waste of materials in the impact process. In addition, the buffering energy absorbing material is set to have the same or similar hardness as the energy absorbing member in the headrest to be tested, which can more realistically simulate the impact of the headrest in actual use.

[0015] At the same time, the mounting plate provided with the buffer energy-absorbing material is connected to the support frame in a flippable manner, so that the angle of the buffer energy-absorbing material can be adjusted by adjusting the flipping angle of the mounting plate, so that the auxiliary device can meet the multi-angle requirements of different working conditions such as linear impact, pendulum impact and free flight, which is conducive to improving the versatility of the auxiliary device.

[0016] In addition, the energy absorbing member uses multiple springs arranged at intervals along the circumference of the fixing frame. It has a simple structure and has good elastic energy absorption effect, which can play a good buffering role. At the same time, the setting of multiple springs can also ensure the stability of the auxiliary device during the impact process. A driving device for driving the mounting plate to rotate is set on the support frame, which can easily adjust the angle of the mounting plate to meet the test requirements of different working conditions.

[0017] Secondly, the angle display device installed on the mounting plate can display the angle formed between the mounting plate and the supporting frame in real time during the process of adjusting the angle of the mounting plate by the driving device. In this way, the operator can accurately adjust the mounting plate to the required angle according to the reading of the angle display device to ensure the accuracy of the test conditions.

[0018] In addition, universal wheels are arranged at the bottom of the support frame to facilitate the flexible movement of the auxiliary device, reduce the labor intensity of the operator's movement, and improve the convenience of using the auxiliary device. Magnetic fixings are arranged at the bottom of the support frame to ensure the stability of the auxiliary device during the impact process and prevent the calibration result of the impact velocity from being affected by the movement of the auxiliary device.

[0019] Another object of the present invention is to provide a method for calibrating the impact velocity of a headrest, the calibration method being based on the auxiliary device for calibrating the impact velocity of a headrest as described above, and the calibration method comprising:

[0020] Fixing the auxiliary device for headrest impact velocity calibration at a preset position on a test platform of a headrest impact test bench;

[0021] According to the requirements of the test conditions, the angle of the mounting plate is adjusted;

[0022] Move the driving end of the transmitter to a preset safe position, install a positioning tool on the driving end, and use the positioning tool to adjust the positions of multiple instantaneous speed sensors respectively;

[0023] The positioning tool is removed, a ball head is installed on the driving end, and an impact test is performed on the buffer energy absorbing material through the ball head;

[0024] Obtaining each instantaneous speed in the impact test, calculating an average value of a plurality of the instantaneous speeds, and comparing the average value with a set speed value of the impact test bench;

[0025] When the difference between the average value and the set speed value exceeds an allowable range, the test parameters of the headrest impact test bench are adjusted, the impact test is repeated, and the average value obtained is compared with the set speed value until the difference between the average value and the set speed value is within an allowable range.

[0026] Furthermore, the preset safety position is a position where the distance between the outer end surface of the driving end and the outer side surface of the buffer energy absorbing material is between 320 mm and 350 mm.

[0027] Furthermore, the multiple instantaneous speed sensors include two photoelectric gate sensors arranged at intervals; the line between the transmitting end and the receiving end of one of the photoelectric gate sensors extends in the horizontal direction, and the line between the transmitting end and the receiving end of the other photoelectric gate sensor extends in the vertical direction.

[0028] Furthermore, the positioning tooling includes a positioning tube connected to the driving end, the cross-section of the positioning tube is rectangular, and the positioning tube is provided with a first through hole and a second through hole; when debugging the position of each of the instantaneous speed sensors, the emission light beam of one of the photoelectric gate sensors can pass through the first through hole and irradiate the receiving end of the photoelectric gate sensor, and the emission light beam of the other photoelectric gate sensor can pass through the second through hole and irradiate the receiving end of the photoelectric gate sensor.

[0029] Furthermore, the test parameters include at least one of a launch speed of the launcher and a position parameter of the preset safety position.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] The calibration method of the headrest impact velocity of the present invention is based on the above-mentioned auxiliary device for headrest impact test, and realizes accurate calibration of the impact velocity of the headrest impact test bench through a series of steps. The specific steps include fixing the auxiliary device, adjusting the angle of the mounting plate, installing the positioning tooling to debug the position of the instantaneous velocity sensor, performing the impact test, calculating the instantaneous velocity average value and comparing it with the set velocity value, and when the difference between the average value and the set velocity value exceeds the allowable range, adjusting the test parameters and repeating the test until the requirements are met. The steps of this method are simple to operate, the fixing of the auxiliary device and the debugging of the instantaneous velocity sensor are time-saving, and the repeated impact tests are highly accurate, so that the impact velocity of the headrest impact test bench can be quickly calibrated.

[0032] In addition, setting the preset safety position within the position range of 320mm-350mm between the outer end face of the driving end and the outer side face of the buffer energy absorbing material is conducive to reducing the number of repeated tests, and can also ensure the safe retreat of the ball head to prevent damage to the transmitter. The multiple instantaneous speed sensors include two photoelectric gate sensors arranged at intervals, and the light beam emitted by one photoelectric gate sensor is in the horizontal direction, and the light beam emitted by the other photoelectric gate sensor is in the vertical direction. This arrangement can facilitate the preparation of the positioning tooling, improve the convenience of the positioning tooling installation, and is also more conducive to saving the debugging time of the instantaneous speed sensor position.

[0033] In addition, the positioning fixture uses a positioning tube with a rectangular cross section, which has a simple structure and is easy to process and prepare, and is also convenient for the position adjustment of each instantaneous velocity sensor. The test parameters include at least one of the launch speed of the launcher and the position parameter of the preset safety position, so that the test parameter adjustment range is small, which is conducive to the rapid calibration of the impact velocity of the headrest impact test bench. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0035] Figure 1 It is a structural schematic diagram of the auxiliary device for calibrating the impact velocity of a headrest according to an embodiment of the present invention;

[0036] Figure 2 It is a structural schematic diagram of the application state of the auxiliary device for headrest impact velocity calibration according to an embodiment of the present invention;

[0037] Figure 3 is a logic diagram of a method for calibrating the impact velocity of a headrest according to an embodiment of the present invention;

[0038] Description of reference numerals:

[0039] 1. Fixed frame; 2. Support frame; 3. Mounting plate; 4. Energy absorbing part; 5. Driving device; 6. Angle display; 7. Universal wheel; 8. Magnetic fixing part;

[0040] 10. Driving end; 20. Positioning tooling; 30. Ball head; 31. Buffering energy-absorbing material; 201. First through hole; 202. Second through hole; 11. Mounting bracket; 51. Control valve; 81. Screw; 82. Locking nut; 83. Magnetic attraction part; 91. First transmitting end; 92. First receiving end; 93. Second transmitting end; 94. Second receiving end. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0042] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc., they are based on the orientation or positional relationship 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, if there are terms such as "first", "second", etc., they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0043] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connection" and "connector" 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 a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0044] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0045] Embodiment 1

[0046] In view of the prior art, during the speed calibration process of the headrest impact test bench, there is a problem that the seat frame and foam are severely damaged and cannot be reused, resulting in waste of materials and causing certain damage to the ball head and the launcher.

[0047] To this end, this embodiment proposes an auxiliary device for headrest impact velocity calibration (hereinafter referred to as the auxiliary device), which can solve the problems of material waste and easy damage to equipment during velocity calibration. And in terms of overall structure, Figure 1 and Figure 2 As shown, the auxiliary device for calibrating the impact velocity of a headrest in this embodiment includes a fixing frame 1 , a supporting frame 2 and a mounting plate 3 .

[0048] The support frame 2 is connected to the fixed frame 1 through the energy absorbing member 4. The mounting plate 3 is connected to the support frame 2 in a flippable manner, and a buffering energy absorbing material 31 for buffering the ball head 30 of the headrest impact test bench is provided on one side of the mounting plate 3. The buffering energy absorbing material 31 has the same or similar hardness to the energy absorbing member 4 in the headrest to be tested.

[0049] At this time, in the above structure, the support frame 2 is connected to the fixed frame 1 through the energy absorbing member 4, which can play a buffering role in the process of the ball head 30 impacting the buffering energy absorbing material 31 for speed calibration, and combined with the energy absorbing characteristics of the buffering energy absorbing material 31 set on the mounting plate 3, it can absorb most of the energy during the impact process, and can reduce the damage to the transmitter and auxiliary devices during the impact process. Setting the buffering energy absorbing material 31 to have the same or similar hardness as the energy absorbing member 4 in the headrest to be tested can more realistically simulate the impact of the headrest in actual use.

[0050] At the same time, the mounting plate 3 provided with the buffer energy-absorbing material 31 is connected to the support frame 2 in a flippable manner. By flipping the mounting plate 3, the angle of the buffer energy-absorbing material 31 can be adjusted, so that the auxiliary device can meet the multi-angle requirements of different working conditions such as linear impact, pendulum impact and free flight, which is conducive to improving the versatility of the auxiliary device.

[0051] It should be noted that the energy absorbing member 4 in the headrest to be tested mentioned above mainly refers to the filler in the headrest that plays a role of cushioning and comfort, such as foam, etc. In addition, the buffering energy absorbing material 31 set on one side of the mounting plate 3 has the same or similar hardness as the energy absorbing member 4 in the headrest to be tested. Specifically, the buffering energy absorbing material 31 can be made of the same material as the energy absorbing member in the test headrest, or other materials with the same hardness as the energy absorbing member in the headrest. Of course, the buffering energy absorbing material 31 can also be made of other materials with approximately the same hardness as the energy absorbing member in the headrest, and generally, the hardness of the buffering energy absorbing material 31 of 40HA-50HA can meet the use requirements.

[0052] Based on the above overall structure, in detail, as a preferred implementation form, in this embodiment, the fixed frame 1 can be structured, for example, by welding a plurality of rectangular tubes into a rectangular frame structure. The support frame 2 can also be structured, for example, by welding a plurality of rectangular tubes into a U-shaped frame structure. At this time, the design of the fixed frame 1 and the support frame 2 has the characteristics of simple structure and low manufacturing cost, and is also conducive to the lightweight design of the auxiliary device compared to the use of plate-like components.

[0053] The energy absorbing member 4 is arranged between the fixed frame 1 and the supporting frame 2, and the two ends of the energy absorbing member 4 are respectively connected to the fixed frame 1 and the supporting frame 2. And as a preferred embodiment, the energy absorbing member 4 includes a plurality of springs arranged at intervals along the circumference of the fixed frame, and the two ends of each spring are respectively connected to the fixed frame 1 and the supporting frame 2. In specific implementation, springs are provided at the four corners of the fixed frame 1 and the supporting frame 2, and the two ends of each spring are respectively connected to the fixed frame 1 and the supporting frame 2. At this time, the energy absorbing member 4 adopts a spring, which has a simple structure and has a good elastic energy absorption effect, and can play a good buffering role. At the same time, the setting of multiple springs can also ensure the stability of the auxiliary device during the impact process.

[0054] In this embodiment, one end of the mounting plate 3 is rotatably connected to one end of the support frame 2 via a pin, so that the mounting plate 3 can be turned over relative to the support frame 2. To facilitate the rotation of the mounting plate 3, in this embodiment, a driving device 5 for driving the mounting plate 3 to rotate is provided on the support frame 2. By driving the mounting plate 3 to rotate via the driving device 5, the angle of the mounting plate 3 can be conveniently adjusted to meet the test requirements of different working conditions.

[0055] In specific implementation, the driving device 5 is, for example, a cylinder or an oil cylinder, and the power output end of the driving device 5 is hingedly connected to the mounting plate 3. Driven by the driving device 5, the mounting plate 3 rotates in the direction pointing to the other end of the support frame 2. At this time, the angle α formed between the mounting plate 3 and the support frame 2 is preferably between 30° and 90°. For example, when the angle α is set at 90°, that is, when the mounting plate 3 is set perpendicular to the support frame 2, it is used for the test of the linear impact condition. When the angle α is set at 30°, 45°, or 65°, it is used for other conditions, such as pendulum impact or free flight or test conditions of a desired angle.

[0056] It is worth noting that in order to realize the movement of the air cylinder or the oil cylinder to drive the mounting plate 3 to rotate, an oil pipeline or a gas-liquid pipeline is also provided in this embodiment, and in order to improve the use effect, a control valve 51 is also provided in the pipeline, and the control valve 51 can be provided on the fixed frame 1, for example.

[0057] Continue to view Figure 1 and Figure 2As shown, in this embodiment, an angle display 6 is also provided on the mounting plate 3, and the angle display 6 is used to display the angle α formed between the mounting plate 3 and the support frame 2. At this time, the setting of the angle display 6 can display the angle of the angle formed between the mounting plate 3 and the support frame 2 in real time during the process of the driving device 5 adjusting the angle of the mounting plate 3, so that the operator can accurately adjust the mounting plate 3 to the required angle according to the reading of the angle display 6, ensuring the accuracy of the test conditions. It should be noted here that the angle display 6 can adopt a mature product in the prior art, and this embodiment does not describe this structure in detail.

[0058] In addition, in this embodiment, a universal wheel 7 is provided at the bottom of the support frame 2, which can facilitate the flexible movement of the auxiliary device, reduce the labor intensity of the operator's movement, and improve the convenience of use. Moreover, in this embodiment, a magnetic fixing member 8 is also provided at the bottom of the support frame 2, which can ensure the stability of the auxiliary device during the impact process and prevent the calibration result of the impact speed from being affected by the movement of the auxiliary device.

[0059] During specific implementation, universal wheels 7 are respectively provided at the four corners of the bottom of the support frame 2, and a magnetic fixing part 8 is also provided, and the magnetic fixing part 8 is connected to the support frame 2 through an L-shaped mounting bracket 11. Specifically, the magnetic fixing part 8 includes a screw 81 screwed on the mounting bracket 11, and a magnetic part 83 fixed at one end of the screw 81 and a locking nut 82 screwed at the other end of the screw 81. By rotating the screw 81, the distance of the magnetic part 83 relative to the bottom of the support frame 2 can be adjusted. Among them, the magnetic part 83 can be, for example, a magnet. At this time, the test platform for fixing the auxiliary device can be made of a metal plate that cooperates with the magnet for magnetic adsorption, so that the auxiliary device can be better fixed on the test platform by magnetic force.

[0060] When the auxiliary device of this embodiment is used, when it is necessary to move the auxiliary device, the screw 81 can be rotated to make the magnetic part 83 move upward along the axial direction of the screw 81. At this time, the magnetic fixing member 8 is in the storage position, and the auxiliary device can be moved through the universal wheel 7. When the auxiliary device needs to be fixed, the screw 81 is rotated to make the magnetic part 83 move downward along the axial direction of the screw 81, so that each universal wheel 7 is separated from the horizontal plane, and the auxiliary device is supported by the magnetic fixing member 8 and fixed by the magnetic part 83.

[0061] It is worth mentioning that in addition to setting the universal wheel 7 and the magnetic fixing part 8 at the bottom of the fixed frame 1 in this embodiment, it is also possible to only set the universal wheel 7 at the bottom of the fixed frame 1, or only set the magnetic fixing part 8 at the bottom of the fixed frame 1.

[0062] The auxiliary device for calibrating the impact velocity of the headrest in this embodiment can not only reduce the waste of materials and the damage to the transmitter and the auxiliary device during the impact process, but also can more realistically simulate the impact conditions of the headrest in actual functional use. At the same time, it can also meet the multi-angle requirements of different working conditions such as linear impact, pendulum impact and free flight, which is conducive to improving the versatility of use.

[0063] Embodiment 2

[0064] This embodiment relates to a method for calibrating the impact velocity of a headrest. The calibration method is based on the auxiliary device for headrest impact test of the first embodiment, and in terms of overall design, Figure 3 As shown, the calibration method includes the following steps:

[0065] Step S1, fix the auxiliary device for headrest impact velocity calibration at a preset position on the test platform. In step S1, the auxiliary device can be fixed at the preset position of the test platform by, for example, screw connection, or by a magnetic fixing member 8 provided at the bottom of the fixed frame 1, and fixed at the preset position of the test platform by the magnetic force of the magnetic fixing member 8, so as to ensure the fixing effect of the auxiliary device.

[0066] Step S2, adjust the angle of the mounting plate 3 according to the requirements of the test conditions. In step S2, the test conditions may be, for example, linear impact, pendulum impact, free flight or other test conditions that require a specific angle. At this time, adjust the angle of the mounting plate 3 according to the requirements of the test conditions. This embodiment is described in detail using the linear impact condition as an example, and under this condition, the mounting plate 3 is vertically arranged with the support frame 2, that is, the angle formed between the mounting plate 3 and the support frame 2 is 90°, and the mounting plate 3 is driven to rotate by the driving device 5 so that when the angle between the mounting plate 3 and the support frame 2 is 90°, the mounting plate 3 is fixed.

[0067] Step S3, move the driving end 10 of the transmitter to a preset safety position, install a positioning fixture 20 on the driving end 10, and use the positioning fixture 20 to adjust the positions of multiple instantaneous velocity sensors respectively. In step S3, by manipulating the remote handle of the headrest impact test bench, the driving end 10 of the transmitter is moved to a preset safety position, wherein the preset safety position is specifically a position where the distance between the outer end face of the driving end 10 and the outer side face of the buffer energy absorbing material 31 is between 320mm-350mm. At this time, the setting of the preset safety position is conducive to reducing the number of repeated tests, and can also effectively prevent damage to the transmitter during the retreat process of the ball head 30 after the impact. In the specific implementation, the spacing can be set to 320mm, 325mm, 330mm, 335mm, 340mm, 345mm or 350mm, etc.

[0068] In addition, the positioning tool 20 is used to locate the positions of multiple instantaneous speed sensors. Among them, as a preferred embodiment, in this embodiment, the multiple instantaneous speed sensors include two photoelectric gate sensors arranged at intervals. The connection line between the transmitting end and the receiving end of one photoelectric gate sensor extends in the horizontal direction, and the connection line between the transmitting end and the receiving end of the other photoelectric gate sensor extends in the vertical direction. At this time, the two photoelectric gate sensors set up can facilitate the preparation of the positioning tool 20, improve the convenience of installing the positioning tool 20, and also be more conducive to saving the debugging time of the instantaneous speed sensor position.

[0069] In order to better understand the present solution, two photoelectric gate sensors are now defined as a first photoelectric gate sensor and a second photoelectric gate sensor. The transmitting end and the receiving end in the first photoelectric gate sensor are defined as a first transmitting end 91 and a first receiving end 92, respectively. The transmitting end and the receiving end in the second photoelectric gate sensor are defined as a second transmitting end 93 and a second receiving end 94, respectively. Figure 2 As shown, the line between the first transmitting end 91 and the first receiving end 92 extends in the horizontal direction, and the line between the second transmitting end 93 and the second receiving end 94 extends in the vertical direction.

[0070] Based on the setting of two photoelectric gate sensors, the positioning fixture 20 of this embodiment, in terms of structure, includes a positioning tube with a rectangular cross section, one end of which is fixed to the front end of the driving end 10 by, for example, screwing, clamping or plugging. In addition, a first through hole 201 and a second through hole 202 are provided on the positioning tube, the first through hole 201 penetrates the upper and lower surfaces of the positioning tube, and the second through hole 202 penetrates the left and right surfaces of the positioning tube. Moreover, the first through hole 201 and the second through hole 202 are two holes arranged at intervals.

[0071] When debugging the positions of each instantaneous speed sensor, that is, when debugging the positions of the two photoelectric gate sensors, the emission light beam of one photoelectric gate sensor can pass through the first through hole 201 and irradiate the receiving end of the photoelectric gate sensor, and the emission light beam of the other photoelectric gate sensor can pass through the second through hole 202 and irradiate the receiving end of the photoelectric gate sensor. After the positions of the two photoelectric gate sensors are debugged, the positions of the photoelectric gate sensors are fixed.

[0072] In this embodiment, the positioning fixture 20 adopts a positioning tube with a rectangular cross section, which has a simple structure, is easy to process and prepare, and is also convenient for position adjustment of each instantaneous speed sensor.

[0073] It is worth mentioning that the positions of the two photoelectric gate sensors should be as close as possible to the outer side of the buffering energy absorbing material 31 on the mounting plate 3, so that the speed at the moment when the ball head 30 hits the outer side of the buffering energy absorbing material 31 can be better detected. In addition, it is also worth mentioning that in addition to setting two photoelectric gate sensors, they can also be set to three, four or other multiple, and the direction of the light emitted by each photoelectric gate sensor can also be arranged at an angle with the horizontal plane or the vertical plane.

[0074] Step S4, remove the positioning fixture 20, install the ball head 30 on the driving end 10, and perform an impact test on the buffering energy absorbing material 31 through the ball head 30. In step S4, after the position adjustment of each instantaneous velocity sensor is completed, the positioning fixture 20 is removed from the front end of the driving end 10, and then the ball head 30 is installed on the front end of the driving end 10, wherein the ball head 30 is set on the guide member, and the guide member is slidably set on the driving end 10. That is, the ball head 30 is installed on the driving end 10 through the guide member, and then the headrest impact test bench equipment is started, and the buffering energy absorbing material 31 is impacted by the ball head 30.

[0075] During the impact process, the driving end 10 drives the guide member and the ball head 30 to move in a straight line to hit the buffering energy-absorbing material 31 on the mounting plate 3. When the driving end 10 moves into place, the driving end 10 stops moving. At this time, the guide member and the ball head 30 continue to move toward the buffering energy-absorbing material 31 under the action of inertia. After the ball head 30 hits the buffering energy-absorbing material 31, the collision force drives the ball head 30 and the guide member to move in the direction pointing to the driving end 10. After moving a certain distance, the guide member is locked on the driving end 10.

[0076] Step S5, obtaining each instantaneous speed in the impact test, calculating the average value of multiple instantaneous speeds, and comparing the average value with the set speed value of the impact test bench. At the moment when the ball head 30 hits the buffer energy absorbing material 31, two photoelectric gate sensors are used to obtain the instantaneous speed during the impact test, and the average value of multiple instantaneous speeds is calculated by the controller, and then the average value is compared with the set speed value of the impact test bench. Among them, the program in the controller of this embodiment can be implemented by programming using an existing mature PLC.

[0077] Step S6: When the difference between the average value and the set speed value exceeds the allowable range, adjust the test parameters of the headrest impact test bench, repeat the impact test, and compare the obtained average value with the set speed value until the difference between the average value and the set speed value is within the allowable range.

[0078] Among them, it is worth mentioning that according to regulatory requirements, the impact speed of the seat headrest is between 24.1Km / h±0.5Km / h and 26.4Km / h±0.5Km / h. In step S6, when the difference between the average value and the set speed value exceeds the allowable range, that is, when the above test requirements are not met, the test parameters of the headrest impact test bench are adjusted, and the test parameters include at least one of the launch speed of the launcher and the position parameter of the preset safety position. After the test parameters are corrected, the impact test is repeated, and the average value obtained is compared with the set speed value until the difference between the average value and the set speed value is within the allowable range.

[0079] The above-mentioned correction of the position parameters of the preset safety position, that is, adjusting the distance value between the outer end face of the driving end 10 and the outer side face of the buffer energy absorbing material 31, can also be adjusted by adjusting the braking time of the guide member or the position of the launcher retraction point.

[0080] The headrest impact velocity calibration method of this embodiment is based on the above-mentioned auxiliary device for headrest impact test, and realizes accurate calibration of the impact velocity of the impact test bench through a series of steps. The method steps are simple to operate, the fixing of the auxiliary device and the debugging of the instantaneous velocity sensor are short, and the repeated impact test has high accuracy, so that the impact velocity of the headrest impact test bench can be quickly calibrated, and has a good use effect.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An auxiliary device for calibrating the impact velocity of a headrest, arranged on a headrest impact test bench, characterized in that: The auxiliary device comprises a fixing frame (1), a supporting frame (2) and a mounting plate (3); The supporting frame (2) is connected to the fixed frame (1) via an energy absorbing member (4); The mounting plate (3) is connected to the support frame (2) in a flippable manner, and a buffering energy absorbing material (31) for buffering a ball head (30) of the headrest impact test bench is provided on one side of the mounting plate (3), wherein the buffering energy absorbing material (31) has the same or nearly the same hardness as an energy absorbing member (4) in the headrest to be tested.

2. The auxiliary device for calibrating the impact velocity of a headrest according to claim 1, characterized in that: The energy absorbing member (4) comprises a plurality of springs arranged at intervals along the circumference of the fixing frame, and two ends of each of the springs are respectively connected to the fixing frame (1) and the supporting frame (2).

3. The auxiliary device for calibrating the impact velocity of a headrest according to claim 1, characterized in that: The support frame (2) is provided with a driving device (5) for driving the mounting plate (3) to rotate.

4. The auxiliary device for calibrating the impact velocity of a headrest according to claim 1, characterized in that: An angle display instrument (6) is provided on the mounting plate (3), and the angle display instrument (6) is used to display the angle formed between the mounting plate (3) and the supporting frame (2).

5. The auxiliary device for calibrating the impact velocity of a headrest according to any one of claims 1 to 4, characterized in that: The bottom of the support frame (2) is provided with universal wheels (7); and / or, A magnetic fixing member (8) is provided at the bottom of the support frame (2).

6. A method for calibrating the impact velocity of a headrest, characterized in that: The calibration method is based on the auxiliary device for headrest impact velocity calibration according to any one of claims 1 to 5, and the calibration method comprises: Fixing the auxiliary device for headrest impact velocity calibration at a preset position on a test platform of a headrest impact test bench; According to the requirements of the test conditions, the angle of the mounting plate (3) is adjusted; The driving end (10) of the transmitter is moved to a preset safe position, and a positioning tool (20) is installed on the driving end (10), and the positions of a plurality of instantaneous speed sensors are respectively adjusted using the positioning tool (20); The positioning tool (20) is removed, a ball head (30) is installed on the driving end (10), and an impact test is performed on the buffer energy absorbing material (31) through the ball head (30); Obtaining each instantaneous speed in the impact test, calculating an average value of a plurality of the instantaneous speeds, and comparing the average value with a set speed value of the impact test bench; When the difference between the average value and the set speed value exceeds an allowable range, the test parameters of the headrest impact test bench are adjusted, the impact test is repeated, and the average value obtained is compared with the set speed value until the difference between the average value and the set speed value is within an allowable range.

7. The method for calibrating the headrest impact velocity according to claim 6, characterized in that: The preset safety position is a position where the distance between the outer end surface of the driving end (10) and the outer side surface of the buffer energy absorbing material (31) is between 320 mm and 350 mm.

8. The method for calibrating the headrest impact velocity according to claim 6, characterized in that: The plurality of instantaneous speed sensors include two photoelectric gate sensors arranged at intervals; A connecting line between a transmitting end and a receiving end of one of the photoelectric gate sensors extends in a horizontal direction, and a connecting line between a transmitting end and a receiving end of the other photoelectric gate sensor extends in a vertical direction.

9. The method for calibrating the headrest impact velocity according to claim 8, characterized in that: The positioning tool (20) comprises a positioning tube connected to the driving end (10); the cross section of the positioning tube is rectangular, and a first through hole (201) and a second through hole (202) are provided on the positioning tube; When adjusting the position of each instantaneous speed sensor, the emission light beam of one of the photoelectric gate sensors can pass through the first through hole (201) and irradiate the receiving end of the photoelectric gate sensor, and the emission light beam of another photoelectric gate sensor can pass through the second through hole (202) and irradiate the receiving end of the photoelectric gate sensor.

10. The method for calibrating the headrest impact velocity according to claim 6, characterized in that: The test parameters include at least one of a launch speed of the launcher and a position parameter of the preset safety position.

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