Human body gravity static tester and test method

Abstract

A human body gravity static tester includes a static pressure block, a pressure sensor, a lifting platform, a driving mechanism, a control platform and an instrument frame. The static pressure block is fixed to the lower end of the lifting platform through a pressure sensor. The lifting platform moves up and down through a driving mechanism. The driving mechanism is installed on the instrument frame. The control platform controls the position of the lifting platform through the driving mechanism. The pressure sensor can transmit the detected pressure data to the control platform. The static pressure block includes a contoured part and a flexible part. The flexible part is made of a flexible material. The contoured part is made of a rigid material. The flexible part at least covers the lower end surface of the contoured part so that the contoured part does not directly contact the product for human body gravity static test. The lower end surface of the contoured part is a cylindrical surface or two cylindrical surfaces or a spherical surface or two spherical surfaces or a spherical surface combined with a cylindrical surface or a contoured surface of the skeleton structure of various parts of the human body. This can improve the accuracy of the test.

Description

Technical Field

[0001] The invention belongs to the field of medical device testing, and in particular relates to a human body gravitational static tester and a testing method. Background Art

[0002] The human body gravity static tester is a device for testing medical equipment. It mainly simulates the deformation of various medical equipment under the action of human body gravity when in use, and determines whether it meets the requirements by the amount of deformation or damage. Static test does not consider the situation of dynamic load, so generally a mechanical drive structure is directly used to generate a static load force on the position of the medical device to be tested. The magnitude of the force is easy to adjust, but the contact surface between the human body and the medical device is an irregular curved surface, and the contact area and force magnitude of the medical device at different positions are different, so it is difficult to simulate the actual use state for strength testing.

[0003] The Chinese patent announcement number "CN214277714U" and the patent name "A human body weight static test device" discloses a test device, in which the bottom of the pressure block group is flat, which has obvious disadvantages in the human body gravity static test of some medical devices with curved structures. Concentrated stress will be generated at the edge of the pressure block group, while almost no force will be generated at the center of the pressure block group. This is exactly the opposite of the actual use situation. The force generated by the medical device during use is concentrated in the central area rather than the edge. Using such a device for testing has many unreasonable factors for structures with strong toughness and poor rigidity. Even if the strength meets the requirements, the deformation may exceed the standard requirements. For some materials with good rigidity but low strength, even if they meet the test requirements, they will be easy to crack in actual use, resulting in a low service life. Therefore, the test results of such a test device are somewhat different from the actual use experience, that is, the detection device and detection method have loopholes. Summary of the invention

[0004] In view of the above-mentioned prior art, the object of the present invention is to provide a more accurate human body gravity static tester and test method.

[0005] The technical solution of the present invention is implemented as follows: a human body gravity static tester includes a static pressure block, a pressure sensor, a lifting platform, a driving mechanism, a control platform and an instrument frame. The static pressure block is fixed to the lower end of the lifting platform through the pressure sensor. The lifting platform is moved up and down by the driving mechanism. The driving mechanism is installed on the instrument frame. The control platform controls the position of the lifting platform through the driving mechanism. The pressure sensor can transmit the detected pressure data to the control platform. The static pressure block includes a profiling part and a flexible part. The flexible part is made of a flexible material, and the profiling part is made of a rigid material. The flexible part at least covers the lower end surface of the profiling part so that the profiling part does not directly contact the product undergoing human body gravity static test. The lower end surface of the profiling part is a cylindrical surface or two cylindrical surfaces or a spherical surface or two spherical surfaces or a spherical surface combined with a cylindrical surface or a profiling surface of the skeleton structure of various parts of the human body, or the lower end surface of the profiling part is approximately a cylindrical surface or two cylindrical surfaces or a spherical surface or two spherical surfaces or a spherical surface combined with a cylindrical surface.

[0006] The beneficial effect of such a design is that various parts of the human body are simulated by spherical and cylindrical surfaces, for example, the head is simulated by a spherical surface, the back is simulated by two cylindrical surfaces, the buttocks are simulated by two cylindrical surfaces or two spherical surfaces, the soles of the feet are simulated by a cylindrical surface and a spherical surface, the handle is simulated by a single cylindrical surface, and the flexible part is used to simulate the skin and flesh of the human body. In this way, when a static pressure block is used for human body gravity static test, a load-bearing capacity closer to the actual use state can be obtained, avoiding a large deviation between the test results of medical devices of different hardness and the actual use load-bearing capacity, and preventing some manufacturers from making targeted improvements specifically for human body gravity static test, so that the development and design of medical devices or products are far away from the actual needs of the equipment or products, resulting in a reduction in product service life.

[0007] Furthermore, the profiling surface is a profiling surface of the squeezed curved surface on the side of the human head, back, buttocks, arms, palms, legs or soles of the feet that contacts the medical device. In this way, the force generated by the profiling part is closer to the force generated by the human body on the medical device being tested, making the test data more reasonable.

[0008] Furthermore, the contouring portion includes a support body, a locking structure and a support bar. The support body is installed with multiple support bars. The position of the support bar relative to the support body can be adjusted within a certain range and locked by the locking structure. In this way, a combination of spherical surfaces, cylindrical surfaces or other curved surfaces can be adjusted using one contouring portion. When testing different medical devices and other products, there is no need to replace the static pressure block, that is, the same static pressure block can meet different needs, thereby improving product testing efficiency.

[0009] Furthermore, the support body is provided with an inner cavity, the inner walls on the left and right sides of the inner cavity are provided with sliding grooves, the front side wall of the support body is provided with a screw hole, and a locking structure is provided in the screw hole, and the locking structure is a locking bolt, the locking bolt passes through the front side wall of the support body and abuts against the locking block, and the left and right ends of the locking block are respectively located in the sliding grooves on the left and right sides so that after the locking bolt is rotated, the locking block can move along the sliding groove, and a return spring is provided at the upper end of the support bar. When the support bar is installed in the support body, at least part of the support bar abuts against the locking block, so that the locking bolt pushes the locking block to move to realize the locking function of the support bar, and when contact locking is required, the locking bolt is rotated in the reverse direction to move the locking block away from the support bar in the reverse direction, and the support bar returns to its initial position under the action of the return spring.

[0010] Furthermore, the support body is provided with a hydraulic cavity, and the support bar is driven or locked by hydraulic means. The locking structure is a hydraulic valve so that the support bar can be locked or moved by turning the hydraulic valve on and off. The locking function can be achieved through the hydraulic valve by utilizing the incompressibility of the liquid, that is, when the liquid cannot flow, its volume will basically not change, and it can maintain a certain position unchanged.

[0011] Furthermore, a plurality of support bars are provided in a rectangular array, a straight hole is provided at the upper end of the support bar, a hydraulic pipe is installed in the straight hole, the hydraulic pipe can move linearly relative to the support bar and the outer wall of the hydraulic pipe is kept sealed and connected with the inner wall of the support bar, a valve stem through hole is provided at the upper end of the hydraulic pipe, the hydraulic valve comprises a valve stem, the valve stem is provided with a plurality of valve holes, the valve stem passes through the plurality of valve stem through holes to realize control of the plurality of hydraulic pipes, when the valve hole is rotated to a first position, the hydraulic chamber is connected with the lower end of the hydraulic pipe, when the valve hole is rotated to a second position, the hydraulic chamber is isolated from the lower end of the hydraulic pipe, the plurality of valve stems are arranged in a straight line, a transmission gear is provided at one end of the valve stem, the transmission gears of adjacent valve stems are meshed with each other, the transmission gear is meshed with the driving gear, the driving gear is coaxially fixed with the driving turntable, in this way, all the hydraulic valves can be controlled simultaneously by one driving turntable so that all the hydraulic valves can be opened and changed simultaneously, the position of the support bar can be adjusted at will when the hydraulic valve is opened, and the position of the support bar can be locked when the hydraulic valve is closed.

[0012] Furthermore, the hydraulic chamber is connected with the energy storage chamber, and the energy storage chamber is provided with a piston block, which abuts against the energy storage spring, and the other end of the energy storage spring abuts against the adjusting block. The adjusting block is installed to the energy storage chamber by means of threads. Since the liquid is not elastic, a certain pressure needs to be applied to the hydraulic chamber when the support bar is reset, so that the support bar can be reset. After the hydraulic chamber is connected with the energy storage chamber, the energy storage chamber can provide continuous pressure, so that the support bar can be automatically reset when the hydraulic valve is opened, and can be locked when the hydraulic valve is closed, which is very convenient to use.

[0013] Furthermore, the support body is provided with a plurality of mounting holes, and the profiling portion is matched with a profiling mold, and the profiling mold includes a profiling mold with a concave spherical surface, a profiling mold with a concave cylindrical surface, and a profiling mold with a concave double cylindrical surface. Since the center of gravity of the human body is not always in the center position, the position of the center of gravity will also change according to different postures. Therefore, in order to obtain a force condition closer to actual use, the position of the mounting hole is adjusted to be closer to the actual center of gravity position. The shape of the profiling portion can be quickly adjusted by using the profiling mold. Since there are a large number of support bars, it is difficult and time-consuming to adjust them one by one. Therefore, the shape of the profiling portion can be changed by directly abutting the profiling portion with the profiling mold in a non-locked state.

[0014] Furthermore, the flexible portion is provided with multiple flesh designs that respectively imitate the human head, back, buttocks, arms, palms, legs or soles. The inner concave surface of the flexible portion matches the lower end surface of the corresponding profiling portion so that the flexible portion can cover the lower end surface of the profiling portion. Since the thickness of the skin and flesh of various parts of the human body is different, corresponding adjustments can be made for each part. In this way, the detection results obtained are closer to the actual usage situation, and therefore the detection data is more accurate.

[0015] A human body gravity static test method, using the above human body gravity static tester, firstly, according to the shape of the contact part between the tested product and the human body, one or more similar profiling molds are selected; secondly, the shape of the profiling part is changed by using the profiling mold; again, the flexible part is installed to the lower end surface of the profiling part and covers the lower end surface of the profiling part, and finally, the tested product is installed under the static pressure block, and the driving mechanism is started by the control platform to drive the static pressure block to move to the contact position with the tested product and maintain a certain pressure for a certain time, and observe whether the tested product is damaged or has a large permanent deformation. If damage or large permanent deformation occurs, the test fails, so that more accurate human body gravity static test data can be obtained, and some manufacturers can be prevented from using loopholes in the test method to develop products that meet the test requirements but have a lower actual service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an overall three-dimensional schematic diagram of a human body gravity static tester of the present invention;

[0017] Figure 2 for Figure 1 A partial enlarged view of the middle part;

[0018] Figure 3 It is a schematic diagram of a spherical static pressure block of a human body gravity static tester of the present invention;

[0019] Figure 4 It is a schematic diagram of a semi-cylindrical static pressure block of a human body gravity static tester of the present invention;

[0020] Figure 5It is a schematic diagram of a double semi-cylindrical static pressure block of a human body gravity static tester of the present invention;

[0021] Figure 6 It is a three-dimensional schematic diagram of the static pressing block of Example 2;

[0022] Figure 7 It is a bottom view schematic diagram of the static pressure block of Example 2;

[0023] Figure 8 It is a three-dimensional schematic diagram of the static pressing block of Example 2 after removing the support body;

[0024] Fig. 9 This is a schematic diagram of the support structure of the static pressing block of Example 2;

[0025] Fig.10 It is a three-dimensional schematic diagram of the static pressing block of Example 3;

[0026] Fig.11 This is a three-dimensional schematic diagram of the static pressing block of Example 3 after removing the support body;

[0027] Fig.12 This is a schematic diagram of the support structure of the static pressing block of Example 3;

[0028] Fig.13 A half-section schematic diagram of a support body of a static pressing block in Example 3;

[0029] Fig.14 This is a schematic diagram of the valve stem structure of Example 3;

[0030] Fig.15 It is a partial cross-sectional comparison schematic diagram of the valve stem of Example 3 rotating to the first position and the second position;

[0031] Fig.16 It is a partial cross-sectional schematic diagram of the energy storage chamber of Example 3;

[0032] Fig.17 It is a partial cross-sectional schematic diagram of the valve stem position of Example 4;

[0033] Fig.18 A schematic diagram of a profiling mold of Example 5;

[0034] In the figure: 1, static pressure block; 2, pressure sensor; 3, lifting platform; 4, driving mechanism; 5, control platform; 6, instrument frame; 10, flexible part; 11, profiling part; 12, support body; 13, locking structure; 14, support bar; 15, mounting hole; 16, inner cavity; 17, slide groove; 18, locking block; 19, reset spring; 20, spacer bar; 21, hydraulic pipe; 111, profiling die; 121, edge; 122, hydraulic cavity; 123, energy storage cavity; 124, piston block; 125, energy storage spring; 126, adjusting block; 131, locking bolt; 132, hydraulic valve; 133, valve stem; 134, valve hole; 135, transmission gear; 136, driving gear; 137, driving turntable; 138, energy storage part; 139, locking wheel; 140, mounting plate; 141, straight hole; 142, mounting through hole; 143, piston rod; 200, valve stem through hole. DETAILED DESCRIPTION

[0035] As required, detailed embodiments of the present invention are disclosed herein, but it should be understood that the disclosed embodiments are merely exemplary of the present invention, and the present invention may be implemented in different and alternative forms. The accompanying drawings may not be drawn to scale, and certain features may be exaggerated or reduced to show the details of specific components. Therefore, the specific structural and functional details disclosed herein should not be understood as having a limiting meaning, but only as a representative basis to teach those skilled in the art to adopt the present invention differently. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0036] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a human body gravity static tester includes a static pressure block 1, a pressure sensor 2, a lifting platform 3, a driving mechanism 4, a control platform 5 and an instrument frame 6. The static pressure block 1 is fixed to the lower end of the lifting platform 3 through the pressure sensor 2, and the lifting platform 3 is moved up and down through the driving mechanism 4. The driving mechanism 4 is installed on the instrument frame 6. The control platform 5 controls the position of the lifting platform 3 through the driving mechanism 4. The pressure sensor 2 can transmit the detected pressure data to the control platform 5. The static pressure block 1 includes a contoured portion 11 and a flexible portion 10. The flexible portion 10 is made of flexible material, and the profiling part 11 is made of rigid material. The flexible part 10 at least covers the lower end surface of the profiling part 11 so that the profiling part 11 does not directly contact the product for human body gravity static test. The lower end surface of the profiling part 11 is a cylindrical surface or two cylindrical surfaces or a spherical surface or two spherical surfaces or a spherical surface combined with a cylindrical surface or a profiling surface of the skeleton structure of each part of the human body, or the lower end surface of the profiling part 11 is approximately a cylindrical surface or two cylindrical surfaces or a spherical surface or two spherical surfaces or a spherical surface combined with a cylindrical surface. Since the flexible part 10 is arranged outside the profiling part 11, even if the surface of the profiling part 11 is uneven, under the action of the flexible part 10, the force will be more dispersed and will not be concentrated in the protruding position, so the impact on the test is small, but compared with the prior art that directly uses a flat plate-like structure for testing, it is more in line with the static force distribution generated by the actual gravity of the human body, so a better test effect can be obtained.

[0037] like Figure 1 As shown, the Z axis is in the up and down direction, the X axis is in the left and right direction, and the Y axis is in the front and back direction. Other drawings are also limited with reference to this direction. The orientation is a relative position. The equivalent design of this application that only changes the orientation falls within the protection scope of this application.

[0038] The head, back, buttocks, arms, palms, legs or soles of the human body are easy to contact the tested product, that is, the tested medical device or medical equipment. Therefore, it is more reasonable to simulate the shape of various parts of the human body for testing. Generally speaking, the head of the human body is closer to a sphere. Although the back is relatively flat, it can also be considered as two cylindrical surfaces with a larger radius. The buttocks are also closer to two cylindrical surfaces. The arms are close to the cylindrical surface. The palm is more complex and can usually be considered as a spherical surface with a larger radius. Tests with higher requirements can also be simulated using a profiling model. It is generally believed that the force is more concentrated in a certain area. The legs can be considered as a cylindrical surface. The soles of the feet are also relatively complex and can be considered as a spherical surface connected to a cylindrical surface. The profiling surface can be the profiling surface of the compressed curved surface on the side of the skeleton structure of the human head, back, buttocks, arms, palms, legs or soles of the feet that contacts the medical device. The profiling surface of the skeleton structure of various parts of the human body needs to be made using 3D printing technology or other modeling methods. It can be made according to the size of the average human body skeleton. In this way, the test results are very close to the actual use situation, and the test data obtained is more accurate. The flexible portion 10 is provided with multiple designs respectively imitating the flesh of the human head, back, buttocks, arms, palms, legs or soles. The inner concave surface of the flexible portion 10 matches the lower end surface of the corresponding profiling portion 11 so that the flexible portion 10 can cover the lower end surface of the profiling portion 11.

[0039] like Figure 2 As shown, the profiling portion 11 includes a support body 12, a locking structure 13 and a support bar 14. The support body 12 is equipped with a plurality of support bars 14. The position of the support bar 14 relative to the support body 12 can be adjusted within a certain range and locked by the locking structure 13. The support bar 14 can be a rectangular parallelepiped, cylindrical or other long strip structure. The lower end surface of the support bar 14 can be a spherical surface, a cylindrical surface or other curved surface structure. If the structure of the support bar 14 is small enough, the end surface of the support bar 14 can also be directly set to a plane structure, but the corners need to be rounded or chamfered to avoid sharp edges or corners. When the lower end surface of the profiling portion 11 is spherical, the lower end surface of the support bar 14 is also spherical or other curved surfaces close to a sphere, such as a plane with a relatively large rounded corner. When the lower end surface of the profiling portion 11 is a cylindrical surface, the lower end surface of the support bar 14 can also be set as a cylindrical surface, but the cylindrical surfaces are all in the same axial direction. However, the lower end surface of the support bar 14 is set as a spherical surface or other curved surface, which can also be used to form a cylindrical surface. The smaller the support bar 14 is set, the lower the shape requirement of the lower end surface of the support bar 14 is, and the better the compatibility is. However, from the perspective of production cost, too small a size will increase the production cost. Generally, the cross-sectional area of ​​the support bar 14 is set at 9mm 2 -900mm 2 .

[0040] Embodiment 1:

[0041] like Figure 3As shown, the profiling surface of the static pressure block 1 is spherical. In this embodiment, the profiling portion 11 adopts a fixed structure. A mounting hole 15 is provided at the center of the upper end of the profiling portion 11. The profiling portion 11 is an integrated structure, and the hemispherical profiling portion 11 is wrapped with a hemispherical flexible portion 10.

[0042] like Figure 4 As shown, the profiling surface of the static pressure block 1 is a cylindrical surface, and a mounting hole 15 is provided at the center of the upper end of the figure. The semi-cylindrical profiling portion 11 wraps around the semi-semi-cylindrical flexible portion 10.

[0043] like Figure 5 As shown, the profiling surface of the static pressure block 1 is a double cylindrical surface, and a mounting hole 15 is provided at the center position of the upper end in the figure. The profiling portion 11 of the double semi-cylindrical surface is wrapped with a double semi-cylindrical flexible portion 10. There is no specific requirement for the shape of the upper end surface of the profiling portion 11, and it is only necessary that the strength and space meet the requirements.

[0044] Embodiment 2:

[0045] like Figure 6 , Figure 7 , Figure 8 and Fig. 9 As shown, the support body 12 is in the shape of a square box, and a raised edge 121 is provided on the lower edge of the support body 12 to facilitate fixing the flexible portion 10. The support body 12 is provided with an inner cavity 16, and the inner walls on the left and right sides of the inner cavity 16 are provided with slide grooves 17. The front side wall of the support body 12 is provided with a screw hole, and a locking structure 13 is provided in the screw hole. The locking structure 13 is a locking bolt 131. The locking bolt 131 and the locking wheel 139 are an integrated structure for easy rotation. The locking bolt 131 passes through the front side wall of the support body 12 and abuts against the locking block 18. The left and right ends of the locking block 18 are respectively located in the slide grooves 17 on the left and right sides, so that the locking block 18 can move along the slide groove 17 after the locking bolt 131 is rotated. A reset spring 19 is provided at the upper end of the support bar 14. When the support bar 14 is installed in the support body 12, at least part of the support bar 14 abuts against the locking block 18. The support body 12 is provided with a plurality of mounting holes 15. The support bar 14 is separated by a spacer bar 20 parallel to the locking block 18, so that the spacer bar 20 better limits the position of the support bar 14. The lower end surface of the support bar 14 is a cylindrical surface. The lower end surfaces of all the support bars 14 are arranged on a cylindrical surface to form a larger approximate cylindrical surface, so that the shape of the human body can be simulated for static testing. Although the support bar 14 is subjected to less force, it needs to be used frequently, so it is generally made of metal materials such as steel, which can reduce the test error caused by the difference in shape changes.

[0046] Embodiment 3:

[0047] like Fig.10 , Fig.11 , Fig.12 and Fig.13As shown, the support body 12 is provided with a hydraulic cavity 122, and the support bar 14 is driven or locked by hydraulic means. The locking structure 13 is a hydraulic valve 132 so that the support bar 14 is locked or moved by turning on and off the hydraulic valve 132. Hydraulic oil is provided in the hydraulic cavity 122, and the support bar 14 is moved or locked by the hydraulic oil. In the figure, a plurality of support bars 14 form a shape that is approximately spherical.

[0048] like Fig.10 , Fig.11 , Fig.12 , Fig.13 , Fig.14 , Fig.15 and Fig.16 As shown, the support bars 14 are provided in multiple and in a rectangular array, or in a circular annular arrangement, that is, multiple annular structures are arranged and nested inside and outside, and a straight hole 141 is provided at the upper end of the support bar 14, that is, the support bar 14 is a cylindrical structure, and a hydraulic pipe 21 is installed in the straight hole 141. A sealing ring can be provided outside the hydraulic pipe 21. The hydraulic pipe 21 can move linearly relative to the support bar 14 and the outer wall of the hydraulic pipe 21 is kept sealed and connected with the inner wall of the support bar 14, so that a piston structure can be formed. A valve stem through hole 200 is provided at the upper end of the hydraulic pipe 21, and the aperture of the valve stem through hole 200 is larger than the inner diameter of the hydraulic pipe 21. The hydraulic valve 132 includes The valve stem 133 is provided with a plurality of valve holes 134. The valve stem 133 passes through a plurality of valve stem through holes 200 to control a plurality of hydraulic pipes 21. When the valve hole 134 is rotated to a first position, the hydraulic chamber 122 is connected with the lower end of the hydraulic pipe 21. When the valve hole 134 is rotated to a second position, the hydraulic chamber 122 is isolated from the lower end of the hydraulic pipe 21. The plurality of valve stems 133 are arranged in a straight line. A transmission gear 135 is provided at one end of the valve stem 133. The transmission gears 135 of adjacent valve stems 133 mesh with each other. The transmission gear 135 meshes with the drive gear 136. The drive gear 136 is coaxially fixed with the drive turntable 137. Fig.15 As shown in Figure a, the valve hole 134 rotates to the second position, at which time the valve hole 134 is in a horizontal position, so the hydraulic valve 132 is in a closed state. Fig.15 As shown in the middle b figure, the valve hole 134 rotates to the first position, at which time the valve hole 134 is in a vertical position, and the hydraulic valve 132 is in an open state. In addition to being set as a straight hole 141, the valve hole 134 can also be set as a hole with a 90-degree angle, that is, the two ends of the valve hole 134 are guided when it rotates to a certain position, and the valve hole 134 is not conductive at other positions. The support body 12 is provided with a mounting plate 140, and the mounting plate 140 is provided with a plurality of mounting through holes 142 in a rectangular array, and the upper end of the hydraulic pipe 21 is mounted to the mounting through hole 142.

[0049] like Fig.10 and Fig.16As shown, the support body 12 is provided with an energy storage part 138, the energy storage part 138 is provided with an energy storage chamber 123, the hydraulic chamber 122 is connected with the energy storage chamber 123, the energy storage chamber 123 is provided with a piston block 124, the piston block 124 is in contact with the energy storage spring 125, the other end of the energy storage spring 125 is in contact with the adjustment block 126, and the adjustment block 126 is installed to the energy storage chamber 123 by means of threads. The pressure of the hydraulic chamber 122 can be changed by adjusting the adjustment block 126, and the hydraulic chamber 122 can maintain a certain pressure to push the support bar 14 to reset, so that the reset is more convenient.

[0050] Embodiment 4:

[0051] like Fig.17 As shown, the support bar 14 is provided with multiple and rectangular arrays, the upper end of the support bar 14 is provided with a piston rod 143 and is sealedly connected with the inner wall of the hydraulic pipe 21 to form a piston structure, the hydraulic pipe 21 can move linearly relative to the support bar 14, and the inner wall of the hydraulic pipe 21 is sealedly connected with the upper end of the support bar 14 through a sealing ring, the upper end of the hydraulic pipe 21 is provided with a valve stem through hole 200, the hydraulic valve 132 includes a valve stem 133, the valve stem 133 is provided with multiple valve holes 134, the valve stem 133 passes through the multiple valve stem through holes 200 to control the multiple hydraulic pipes 21, when the valve hole 134 rotates to the first position, the hydraulic chamber 122 is connected with the lower end of the hydraulic pipe 21, when the valve hole 134 rotates to the second position, the hydraulic chamber 122 is isolated from the lower end of the hydraulic pipe 21, and multiple valve stems 133 are arranged in a straight line, and one end of the valve stem 133 is provided with a transmission gear 135, and the transmission gears 135 of adjacent valve stems 133 are meshed with each other. For other structures, reference can be made to the structural design of Embodiment 2 and Embodiment 3.

[0052] Embodiment 5:

[0053] like Fig.18 As shown, the profiling portion 11 is matched with a profiling die 111, and the profiling die 111 includes a profiling die 111 with a concave spherical surface, a profiling die 111 with a concave cylindrical surface, and a profiling die 111 with a concave double cylindrical surface. Fig.18 The middle one is a profiling die 111 with concave double cylindrical surfaces, and the other profiling dies 111 can be made by changing the internal curved surface structure. The profiling die 111 is made of plastic material with low cost.

[0054] Embodiment 6:

[0055] A method for testing human body gravity static force, using the human body gravity static force tester in the above embodiment, firstly, selecting a similar profiling mold 111 according to the shape of the contact part between the tested product and the human body, if multiple parts are to be tested, multiple profiling molds 111 are required; secondly, using the profiling mold 111 to change the shape of the profiling part 11, multiple profiling molds 111 need to change the shape of the profiling part 11 multiple times; again, the flexible part 10 is installed to the lower end surface of the profiling part 11 and covers the lower end surface of the profiling part 11, and finally the tested product is installed under the static pressure block 1, and the driving mechanism 4 is started by the control platform 5 to drive the static pressure block 1 to move to the contact position with the tested product and maintain a certain pressure for a certain time, and observe whether the tested product is damaged or has a large permanent deformation.

[0056] It is generally believed that the human head accounts for 7.4% of the total human mass, the torso with the back as the main contact surface accounts for 40.7% of the total human mass, the thighs account for 11.1% of the total human mass, the calves account for 7.4% of the total human mass, and the entire arms account for 7.4% of the total human mass. Of course, the test must take into account the worst-case stress conditions of each part. For example, when standing, one foot may bear the weight of the entire body. When lying flat, the weight of the arms and head is often loaded onto the back or buttocks, or even the weight of the entire body is loaded onto the buttocks. Therefore, it is necessary to test according to the weight of the entire body.

[0057] If the product being tested needs to bear the weight of the entire human body, it is usually tested at a pressure twice the average gravity of the target group. If the target group is unclear, or the twice weight is less than 135 kg, it is directly tested at a pressure of 1350 Newtons. The pressure needs to be maintained for 1 minute to observe whether the product being tested is damaged or has a permanent deformation of more than 5°. If there is no damage or permanent deformation, it passes the test.

[0058] Since the solution of the present application adopts a contoured structure, it can be directly manufactured according to the average proportions of various parts of the human body without having to consider the area of ​​action separately. The radius of the cylindrical surface can be set at about 400 mm, the radius of the spherical surface can be set at about 100 mm according to the size of the head, the hand wall can be set with a cylindrical surface with a radius of about 40 mm, the leg can be set with a cylindrical surface of about 80 mm, and the palms and soles of the feet can be set according to actual usage.

Claims

1. A human body gravity static tester, comprising a static pressure block (1), a pressure sensor (2), a lifting platform (3), a driving mechanism (4), a control platform (5) and an instrument frame (6), wherein the static pressure block (1) is fixed to the lower end of the lifting platform (3) through the pressure sensor (2), and is characterized in that: The static pressure block (1) comprises a contoured portion (11) and a flexible portion (10), wherein the flexible portion (10) is made of a flexible material, and the contoured portion (11) is made of a rigid material, wherein the flexible portion (10) at least covers the lower end surface of the contoured portion (11) so that the contoured portion (11) does not directly contact the product undergoing the human body gravity static test, wherein the lower end surface of the contoured portion (11) is a cylindrical surface or two cylindrical surfaces or a spherical surface or two spherical surfaces or a combination of a spherical surface and a cylindrical surface, or a contoured surface of a skeleton structure of a human body, or the lower end surface of the contoured portion (11) is approximately a cylindrical surface or two cylindrical surfaces or a spherical surface or two spherical surfaces or a combination of a spherical surface and a cylindrical surface, wherein the contoured portion (11) comprises a support body (12), a locking structure (13) and a support bar (14), wherein the support body (12) is provided with a plurality of the support bars (14), and the support bars (14) are arranged relative to the support body (12). The position of the support body (12) can be adjusted within a certain range and locked by the locking structure (13), the support body (12) is provided with an inner cavity (16), the inner walls on the left and right sides of the inner cavity (16) are provided with sliding grooves (17), the front side wall of the support body (12) is provided with a screw hole, and the locking structure (13) is provided in the screw hole, the locking structure (13) is a locking bolt (131), the locking bolt (131) passes through the front side wall of the support body (12) and abuts against the locking block (18), the left and right ends of the locking block (18) are respectively located in the sliding grooves (17) on the left and right sides, so that after the locking bolt (131) is rotated, the locking block (18) can move along the sliding groove (17), and the upper end of the support bar (14) is provided with a return spring (19), and when the support bar (14) is installed in the support body (12), at least part of the support bar (14) abuts against the locking block (18).

2. The human body gravity static tester according to claim 1, characterized in that: The support body (12) is provided with a hydraulic chamber (122), the support bar (14) is driven or locked by hydraulic means, and the locking structure (13) is a hydraulic valve (132), so that the support bar (14) is locked or moved by turning the hydraulic valve (132) on and off.

3. The human body gravity static tester according to claim 2, characterized in that: The support bars (14) are provided in a plurality and arranged in a rectangular array. A straight hole (141) is provided at the upper end of the support bar (14). A hydraulic pipe (21) is installed in the straight hole (141). The hydraulic pipe (21) can move linearly relative to the support bar (14) and the outer wall of the hydraulic pipe (21) is sealedly connected to the inner wall of the support bar (14). A valve stem through hole (200) is provided at the upper end of the hydraulic pipe (21). The hydraulic valve (132) comprises a valve stem (133). The valve stem (133) is provided with a plurality of valve holes (134). The valve stem (133) passes through the plurality of valve stem through holes (200) to realize the control of the plurality of hydraulic The control of the pressure pipe (21), when the valve hole (134) is rotated to a first position, the hydraulic chamber (122) is connected to the lower end of the hydraulic pipe (21), and when the valve hole (134) is rotated to a second position, the hydraulic chamber (122) is isolated from the lower end of the hydraulic pipe (21), a plurality of valve stems (133) are arranged in a straight line, a transmission gear (135) is provided at one end of the valve stem (133), the transmission gears (135) of adjacent valve stems (133) are meshed with each other, one of the transmission gears (135) is meshed with a driving gear (136), and the driving gear (136) is coaxially fixed with a driving turntable (137).

4. The human body gravity static tester according to claim 3, characterized in that: The hydraulic chamber (122) is communicated with the energy storage chamber (123); the energy storage chamber (123) is provided with a piston block (124); the piston block (124) abuts against an energy storage spring (125); the other end of the energy storage spring (125) abuts against an adjustment block (126); and the adjustment block (126) is mounted to the energy storage chamber (123) by means of threads.

5. The human body gravity static tester according to claim 1, 2, 3 or 4, characterized in that: The support body (12) is provided with a plurality of mounting holes (15), and the profiling portion (11) is matched with a profiling die (111), and the profiling die (111) comprises a profiling die (111) provided with a concave spherical surface, a profiling die (111) provided with a concave cylindrical surface, and a profiling die (111) provided with a concave double cylindrical surface.

6. The human body gravity static tester according to claim 5, characterized in that: The flexible portion (10) is provided with a plurality of designs respectively imitating the flesh of the human head, back, buttocks, arms, palms, legs or soles, and the inner concave surface of the flexible portion (10) matches the lower end surface of the corresponding profiling portion (11) so that the flexible portion (10) can cover the lower end surface of the profiling portion (11).

7. A method for testing human body gravity static force, characterized in that: The human body gravity static tester according to claim 6 is used, firstly, one or more similar profiling molds (111) are selected according to the shape of the contact part between the product to be tested and the human body; secondly, the shape of the profiling part (11) is changed by using the profiling mold (111); thirdly, the flexible part (10) is mounted on the lower end surface of the profiling part (11) and covers the lower end surface of the profiling part (11); finally, the product to be tested is mounted under the static pressure block (1), and the driving mechanism (4) is started by the control platform (5) to drive the static pressure block (1) to move to the contact position between the static pressure block (1) and the product to be tested, and the static pressure block (1) is kept under a certain pressure for a certain period of time to observe whether the product to be tested is damaged or has a large permanent deformation.

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