CN-115979814-B - Device and method for measuring rigidity of cushion assembly

CN115979814BCN 115979814 BCN115979814 BCN 115979814BCN-115979814-B

Abstract

The invention discloses a rigidity measuring device and method for a cushion assembly, comprising a seat plate, a shaft, a bracket, a level gauge and a plurality of groups of balancing weights, wherein the shape of the seat plate is matched with the shape of a backrest and a seat surface of a seat for being attached to the backrest and the seat surface of the seat, two ends of the shaft are respectively connected with the seat plate, two groups of equidistant shaft shoulders are arranged on the shaft, a pointer capable of rotating around the shaft is arranged at the center of the shaft, two ends of the bracket are respectively connected with two ends of the shaft and can rotate around the shaft, the level gauge is arranged on the bracket, each group of balancing weights is divided into two parts with equal weight, the balancing weights are symmetrically and movably arranged on the shaft by taking the center axis of the seat plate as the center, and the two groups of equidistant shaft shoulders on the shaft are used for limiting. The invention can measure the relation between the total deformation of the materials such as the seat skin, the polyurethane foam, the support and the like and the weight of a driver, and finish the rigidity measurement of the cushion assembly system comprising the materials such as the skin, the polyester foam, the support and the like.

Inventors

LIANG LONGYUAN
LI CHUNJIANG
LU YILIN

Assignees

江苏徐工工程机械研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20230106

Claims (6)

1. A cushion assembly rigidity measuring device, comprising: the shape of the seat board is matched with the shape of the seat back and the seat surface and is used for being attached to the seat back and the seat surface; The two ends of the shaft are respectively connected with the seat plate, two groups of equidistant shaft shoulders are arranged on the shaft, and a pointer capable of rotating around the shaft is arranged at the center of the shaft; The two ends of the bracket are respectively connected with the two ends of the shaft and can rotate around the shaft; The level gauge is arranged on the bracket; The balancing weights are divided into two parts with equal weight, are symmetrically and movably arranged on the shaft by taking the central axial surface of the seat plate as a center, and are limited by two groups of equidistant shaft shoulders on the shaft; One end of the pointer is provided with a counterweight; when the bracket is lifted to a locking position around the shaft, the bracket is in a vertical state; the calculation formula of the rigidity of the cushion assembly system is as follows: , In the formula, For the rigidity of the seat cushion assembly system, Is the mass of a single group of balancing weights, In order to add a group of balancing weights to enable the vertical deformation quantity of the cushion to be generated, Is the number of the groups of the balancing weights, Gravitational acceleration.
2. A cushion assembly rigidity measuring apparatus according to claim 1, wherein each of the weights is provided with a groove, and a cross section of the groove is matched with a cross section of the shaft.
3. The cushion assembly rigidity measuring apparatus according to claim 1, wherein the seat pan comprises a bottom plate and a side plate connected to each other, the bottom plate and the side plate each being curved.
4. A cushion assembly rigidity measuring apparatus according to claim 3, wherein the positions of the respective weights close to the side plates are provided with cut angles for fitting the curved surface structures of the side plates.
5. A method of measuring the stiffness of a seat cushion assembly, comprising: placing the seat board on a vehicle seat to be measured, and attaching the seat board to a seat back and a seat surface; lifting a bracket connected with the seat plate to a locking position around a shaft, enabling the bracket to be in a vertical state, and fixing the bracket; The posture and the position of the seat board are adjusted by referring to the level gauge on the bracket, so that the two sides of the seat board are ensured to be horizontal; Sequentially placing each group of balancing weights on a shaft arranged on the seat plate from right above to enable the balancing weight grooves to be matched with the shaft, limiting the positions of the balancing weights through shaft shoulders, and ensuring that the gravity centers of the balancing weights at two sides are symmetrical relative to the axial direction of the seat plate; The pointer on the shaft can freely rotate around the shaft and always keeps a vertical state, and the height of the end part of the pointer from the ground is measured by adding one group of balancing weights, so that the vertical deformation of the cushion caused by adding one group of balancing weights is calculated ; Based on a preset calculation formula of the rigidity of the cushion assembly system, each group of balancing weights is added to enable the vertical deformation amount of the cushion to be generated And the mass of the single group of balancing weights, and calculating the rigidity of the cushion assembly system; one end of the pointer is provided with a counterweight, so that the pointer can freely rotate around the shaft and always keep a vertical state; the calculation formula of the rigidity of the cushion assembly system is as follows: , In the formula, For the rigidity of the seat cushion assembly system, Is the mass of a single group of balancing weights, In order to add a group of balancing weights to enable the vertical deformation quantity of the cushion to be generated, Is the number of the groups of the balancing weights, Gravitational acceleration.
6. The method for measuring rigidity of a seat cushion assembly according to claim 5, wherein grooves are formed in each of the balancing weights, the cross sections of the grooves are matched with the cross sections of the shafts, the seat plate comprises a bottom plate and side plates which are connected, the bottom plate and the side plates are curved, and the positions, close to the side plates, of each of the balancing weights are provided with cutting angles for adapting to the curved structures of the side plates.

Description

Device and method for measuring rigidity of cushion assembly Technical Field The invention belongs to the field of vehicle cab ergonomic design, and particularly relates to a device and a method for measuring rigidity of a cushion assembly. Background At present, in the development process of vehicles, the hard points of the human-computer engineering design are designed and simulated through three-dimensional software, and although parameters of the hard points of all the human-computer engineering can be given, the state of an actual vehicle can not be truly reflected all the time. Measuring the ergonomic hard spot of a vehicle is a necessary means for a good or bad assessment of the vehicle's ergonomic design. Currently, the measurement of hard spots in ergonomic designs is mainly achieved by an H-spot measurement device, which is used to measure the SIP-point of the seat (i.e. the driver seat calibration point) in the state specified by the SAE standard. When the vehicle is actually driven, the weight of the driver cannot be kept at a fixed value (such as 75 kg), and the seat bears different forces, so that the deformation of materials such as the seat skin, the polyurethane foam, the support and the like are different, and therefore, the actual H point positions of the drivers with the same height and different weights are not completely the same. Such a positional error between the actual H point and the design H point due to the weight factor of the driver will affect the merits of the vehicle ergonomic design. When the rigidity of the foaming material of the seat is measured in the seat industry, the seat is mainly loaded by a press machine, deformation and stress are recorded by a sensor, computer assistance is needed, and the measurement can be carried out under the condition that a laboratory is provided with a power supply. Meanwhile, the size of the sample is limited, and the tested seat needs to be damaged and cut to extract the foaming material in the seat surface. More importantly, the rigidity of polyurethane foam can be measured only, but the comprehensive rigidity of the seat skin, the support springs and other series components after being overlapped cannot be measured, so that the method is not suitable for measuring actual vehicles. Disclosure of Invention In order to solve the problems, the invention provides a device and a method for measuring the rigidity of a cushion assembly, which can measure the relation between the total deformation of materials such as a seat skin, polyurethane foam, a support and the like and the weight of a driver, and finish the rigidity measurement of the cushion assembly system comprising the materials such as the skin, the polyester foam, the support and the like. In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme: In a first aspect, the present invention provides a cushion assembly rigidity measuring device comprising: the shape of the seat board is matched with the shape of the seat back and the seat surface and is used for being attached to the seat back and the seat surface; The two ends of the shaft are respectively connected with the seat plate, two groups of equidistant shaft shoulders are arranged on the shaft, and a pointer capable of rotating around the shaft is arranged at the center of the shaft; The two ends of the bracket are respectively connected with the two ends of the shaft and can rotate around the shaft; The level gauge is arranged on the bracket; The balancing weights are divided into two parts with equal weight, the center axial surface of the seat plate is used as the center to be symmetrically and movably arranged on the shaft, and two groups of equidistant shaft shoulders on the shaft are used for limiting. Optionally, one end of the pointer is provided with a counterweight. Optionally, each balancing weight is provided with a groove, and the cross section of the groove is matched with the cross section of the shaft. Optionally, the seat board comprises a bottom board and a side board which are connected, and the bottom board and the side board are both curved surfaces. Optionally, a corner cut is disposed on each balancing weight near the side plate for adapting to the curved surface structure of the side plate. Optionally, the stand is in an upright position when the stand is lifted about the axis to the locked position. In a second aspect, the present invention provides a method for measuring rigidity of a seat cushion assembly, comprising: placing the seat board on a vehicle seat to be measured, and attaching the seat board to a seat back and a seat surface; lifting a bracket connected with the seat plate to a locking position around a shaft, enabling the bracket to be in a vertical state, and fixing the bracket; The posture and the position of the seat board are adjusted by referring to the level gauge on the bracket, so that the two sides