A calcaneus recognition system

Abstract

The present application belongs to the technical field of calcaneus recognition, and relates to a calcaneus recognition system, which comprises a recognition platform, a calcaneus recognition assembly and a handrail assembly; the handrail assembly is arranged on the upper surface of the recognition platform; the calcaneus recognition assembly comprises a camera, and the camera is arranged in the recognition platform; a left foot guide line, a right foot guide line and a standing warning line are arranged on the upper surface of the recognition platform and located in a triangular region formed by the overhead imaging field of view of the camera; the standing warning line is arranged close to the camera, one end of the left foot guide line is connected with the standing warning line; and the left foot guide line and the right foot guide line are symmetrically distributed about the center point of the standing warning line. The system provided by the present application can prevent image deviation when the camera is shooting, and the left foot and the right foot can interfere with each other, so that the error is small; through the handrail assembly, the center of gravity can be stabilized, the body position can be quickly adjusted, and the accuracy of the detection result and the effectiveness of the data can be improved.

Description

Technical Field

[0001] This invention belongs to the field of calcaneal bone recognition technology and relates to a calcaneal bone recognition system. Background Technology

[0002] The calcaneus is the largest tarsal bone in the foot, an irregular rectangular structure composed of a thin layer of cortical bone surrounding abundant cancellous bone. Its main function is to support and protect the foot, participating in activities such as walking, running, and jumping. Its ligaments and muscles are closely connected to other foot bones, forming the skeletal structure of the foot, enabling it to withstand body weight and external impacts while protecting the soft tissues. The calcaneus plays a crucial role in human foot biomechanics and orthopedic research; however, in daily life, genetic factors, overuse, ill-fitting shoes, foot structural abnormalities, and trauma or injury can all cause calcaneal deformities. Severe calcaneal deformities can result in noticeable flat arches or uneven feet, and heel pain. Therefore, it is necessary to identify and collect data on the calcaneus to understand its growth status.

[0003] Currently, the commonly used clinical method for calcaneal measurement involves using X-rays or CT scans, followed by annotation and calculation of the measurement angle by a professional physician. However, this method not only increases the workload of physicians but also poses radiation risks to patients from CT scans. Chinese patent application CN202120306083.2 discloses a system for measuring changes in calcaneal posture angles, including a camera bracket, at least two depth cameras, and several markers. The markers are affixed to characteristic areas of the body surface according to the calcaneal anatomy, so that the design of the lines connecting the markers reflects the varus / valgus and rotation angles of the calcaneus. At least two depth cameras are mounted on the camera bracket and enclose a measurement area to track and capture the moving markers within the measurement area. The depth cameras are connected to a computing device. After the computing device receives the markers captured by the depth cameras, it monitors the changes in the angles of the connecting lines during their movement using the design of the lines between the markers, thereby obtaining the changes in the varus / valgus and rotation angles of the calcaneus. Although it can achieve non-invasive measurement of calcaneal posture and angle changes on the calcaneal surface, avoiding radiation damage to patients during measurement and improving treatment efficiency, existing equipment has the following problems when measuring the calcaneus:

[0004] (1) During measurement, the feet are always parallel. However, when standing like this, the calcaneal images will be inaccurate due to the camera angle shift. Also, when the existing device is used to measure children, the children are shorter and have smaller feet, and the different areas covered by the camera during measurement cause interference between the left and right feet. These situations all lead to inaccurate measurement results and reduce the validity of calcaneal data;

[0005] (2) When the existing measuring device is used, the patient needs to adjust his body position according to actual needs. For patients with large body size, there is a problem of unstable center of gravity. When the patient is a child with the smallest body size who needs to be supported to stand, there is a risk of falling because the distance between the two feet in the standing position is small. This makes the measurement results inaccurate and also has a problem of poor safety. Summary of the Invention

[0006] In view of the technical problems of inaccurate measurement results and poor security in the above-mentioned calcaneal measurement, the present invention provides a calcaneal recognition system.

[0007] This invention sets up a calcaneal recognition component and a handrail component on the recognition platform. It also sets a left guide line, a right guide line, and a standing warning line within the triangular area viewed from above by the camera. The left and right guide lines are at an angle to the standing warning line. When the camera takes a picture, the image will not be shifted, and there will be no interference between the left and right feet, resulting in small errors. Moreover, the handrail component can stabilize the center of gravity when standing, allowing for quick adjustment of body position, thus increasing the accuracy and validity of the detection results.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A calcaneal bone recognition system includes a recognition platform, a calcaneal bone recognition component, and a handrail component;

[0010] The calcaneal recognition component includes a camera, and the armrest component and the camera are respectively placed on the upper surface of the recognition platform;

[0011] The handrail assembly and the camera are arranged opposite to each other, and a standing area is formed on the recognition platform between the handrail assembly and the camera. A left foot guide line, a right foot guide line and a standing warning line are respectively set in the standing area.

[0012] The standing warning line is positioned close to the camera. One end of the left foot guide line is connected to the standing warning line, and the other end of the left foot guide line extends along the left boundary line of the camera's field of view towards the handrail assembly. One end of the right foot guide line is connected to the standing warning line, and the other end of the right foot guide line extends along the left boundary line of the camera's field of view towards the handrail assembly. The left foot guide line and the center point of the standing warning line are symmetrically distributed. The lower boundary of the camera's field of view coincides with the standing warning line, and the center line of the camera's field of view coincides with the central dividing line between the left and right foot guide lines.

[0013] Further defined, the handrail assembly includes a handrail; the handrail is placed on the upper surface of the recognition platform; the height of the handrail is 100cm, and the vertical distance between the handrail and the standing warning line is 48cm.

[0014] Further specified, the angle γ between the left foot guide line and the standing warning line is 97.5°, and the distance between the intersection point of the left foot guide line and the standing warning line and the intersection point of the right foot guide line and the standing warning line is 75mm.

[0015] Further defining the dimensions, the height of the camera from the upper surface of the recognition platform is H1, the vertical distance from the standing warning line to the camera is H2, and the longitudinal shooting angle of the camera is α. Therefore, the image height at the standing warning line can be calculated as H4; the formula for calculating H4 is:

[0016] If H2×tan(1 / 2α)≥H1, H4=tan(1 / 2α)+H1;

[0017] If H2×tan(1 / 2α)

[0018] Further defining the dimensions, the height H1 of the camera from the upper surface of the recognition platform is 85mm, the vertical distance H2 from the standing warning line to the camera is 206mm, and the longitudinal shooting angle α of the camera is 42.75°, then the height H4 of the image at the standing warning line is 161.25mm.

[0019] Further specifying, the calcaneal recognition component also includes an angle adjustment mechanism, a mounting boss is provided on the recognition platform, the mounting boss is perpendicular to the upper surface of the recognition platform, the camera is placed inside the mounting boss through the angle adjustment mechanism, and a camera adjustment hole is provided on the top of the mounting boss; the camera adjustment hole is positioned opposite to the angle adjustment mechanism.

[0020] Further specifying, the angle adjustment mechanism includes a vertical rotating frame and a horizontal rotating frame movably connected to the vertical rotating frame, and the camera is movably connected to the vertical rotating frame.

[0021] Furthermore, the calcaneal recognition component also includes a fixing block disposed within the recognition platform, the camera is fixed on the fixing block, and the fixing block is movably connected to the angle adjustment mechanism.

[0022] Further defined, the fixing block includes a front fixing block and a rear fixing block. The front fixing block has an installation positioning groove inside and a through hole on its end face. The camera is embedded in the installation positioning groove, passes through the installation positioning groove and extends out of the through hole to the outside of the front fixing block. The front fixing block and the rear fixing block are engaged, and the rear fixing block is movably connected to the vertical rotating frame.

[0023] Furthermore, the calcaneal bone recognition system also includes a counterweight plate disposed inside the recognition platform; the handrail passes through the upper surface of the recognition platform and is connected to the counterweight plate.

[0024] The beneficial effects of this invention are:​

[0025] 1. In this invention, by setting a calcaneal recognition component and a handrail component on the recognition platform, and setting a left guide line, a right guide line, and a standing warning line on the standing area, with the left and right guide lines forming an angle with the standing warning line, and the extension lines of the left and right foot guide lines being inside the triangular area formed by the camera's imaging field of view, when the foot center line (i.e., the midpoint between the heel and the second toe) coincides with the aforementioned guide lines, the captured calcaneal image will not produce errors due to angular deviation. At the same time, the standard patient position can be used to ensure the validity of the measurement results. For children standing, the left and right feet will interfere, resulting in small errors. Moreover, the handrail component can stabilize the center of gravity and quickly adjust the body position, increasing the accuracy and validity of the detection results.

[0026] 2. In this invention, the angle γ between the left foot guide line and the standing warning line is 97.5°, ensuring sufficient space between the left and right feet after the patient stands according to the guide line. The intersection point between the left foot guide line and the standing warning line is A, and the intersection point between the right foot guide line and the standing warning line is B. The distance H3 between A and B is set to 75mm. This ensures that when a child stands as required on the rear standing warning line, their feet will not interfere with each other due to insufficient space. Therefore, the guide markers can guide the body to the correct standing position, improving the accuracy of the equipment. When H1 is 85mm, α is 42.75°, and H2 is 206mm, the calculated imaging height H4 at point c of the standing warning line is 161.25mm. For children who can stand with support, this height allows the image to reach the middle of their lower leg, a position important for measuring the midpoint of their tibia.

[0027] 3. In this invention, the angle adjustment mechanism includes a vertical rotating frame and a horizontal rotating frame movably connected to the vertical rotating frame. The camera is movably connected to the vertical rotating frame. In a specific space, the camera's shooting angle can be adjusted as needed. Specifically, the camera's pitch angle in the vertical direction and rotation angle in the horizontal direction are adjusted and calibrated by the angle adjustment mechanism, so that the lower boundary of the camera image coincides with the standing warning line, and the center line of the imaging field of view coincides with the dividing line between the left and right foot guide lines.

[0028] 4. In this invention, the calcaneal recognition component also includes a fixing block disposed within the recognition platform. The fixing block includes a front fixing block and a rear fixing block. A groove is formed inside the front fixing block, and a through hole is formed on the end face of the front fixing block. The camera is embedded in the groove, passes through the groove, and extends out of the through hole to the outside of the front fixing block. The front fixing block and the rear fixing block are engaged. The rear fixing block is movably connected to the vertical rotating frame. The camera is secured in the fixing block by the groove, ensuring that the camera will not shake and has good stability.

[0029] 5. In this invention, a mounting boss is provided on the recognition platform, perpendicular to the upper surface of the platform. The camera is placed on the mounting boss, and a camera adjustment hole is provided on the top of the mounting boss. The mounting boss ensures the installation height and stability of the camera, while the camera adjustment hole allows for adjustment of the rotation angle of the adjustment mechanism without disassembly, offering excellent convenience.

[0030] 6. In this invention, the calcaneal recognition system also includes a counterweight plate disposed inside the recognition platform; the handrail passes through the upper surface of the recognition platform and is connected to the counterweight plate, which can withstand a horizontal lateral force of up to 300N at the handrail, preventing the device from tipping over when the patient uses the handrail assembly and improving the stability of the device. Attached Figure Description

[0031] Figure 1 Three-dimensional structure of calcaneal measurement system Figure 1 ;

[0032] Figure 2 To identify the platform from above;

[0033] Figure 3 for Figure 2 The diagram on the right;

[0034] Figure 4 This is a schematic diagram of the camera's rear seat structure.

[0035] Figure 5 This is a schematic diagram of the camera's edge pressing structure;

[0036] Figure 6 This is a diagram showing the upper base viewed from below.

[0037] Figure 7 This is a top view of the lower base.

[0038] Figure 8 This is a diagram showing the lower base from below.

[0039] Figure 9 This is an exploded view of the calcaneal recognition component;

[0040] Figure 10 This is a schematic diagram of the front fixing block structure;

[0041] Figure 11 This is a schematic diagram of the camera structure;

[0042] Figure 12 This is a schematic diagram of the front structure of the rear fixing block;

[0043] Figure 13 This is a schematic diagram of the rear structure of the rear fixing block;

[0044] Figure 14 This is a schematic diagram of a vertical rotating frame structure;

[0045] Figure 15 This is a schematic diagram of a horizontal rotating frame structure;

[0046] Figure 16 This is a structural diagram of the first connecting flange;

[0047] Figure 17 This is a top view of the handrail cover.

[0048] Figure 18 A diagram showing the handrail cover from below;

[0049] Figure 19 This is a schematic diagram illustrating the principle of calcaneal measurement.

[0050] in:

[0051] 100 - Identification platform; a - Left foot guide line; b - Right foot guide line; c - Standing warning line;

[0052] 101-Upper base; 102-Lower base; 1021-Lower base fixing hole; 1022-Handle position; 1023-Lower base rib position; 1024-Adapter relief groove; 103-Anti-slip pad;

[0053] 110 - Mounting boss; 1101 - Camera mounting slot; 1102 - Camera adjustment hole; 1103 - Camera pressing edge; 1104 - Camera cover plate fixing slot; 1105 - Camera cover plate; 1106 - Camera rear seat; 1107 - First rear seat fixing hole; 1108 - First camera fixing hole; 1109 - Camera cover plate fixing hole; 1110 - Second rear seat fixing hole; 1111 - Pressing edge fixing hole; 1112 - Camera rear seat mounting slot;

[0054] 120 - Adapter; 130 - Adapter mounting slot; 140 - Rib plate; 150 - Camera cable tray; 160 - Cable tray cover; 170 - Cable tray cover fixing hole; 180 - Handrail cover mounting slot; 190 - Handrail cover; 1901 - Handrail mounting clearance hole; 1902 - Handrail cover fixing hole; 1903 - Handrail cover reinforcing rib;

[0055] 200 - Calcaneal bone recognition component; 210 - Camera; 2101 - Main body shell; 2102 - Stabilizing surface boss; 2103 - Lens barrel; 2104 - Adjusting screw; 2105 - Limiting boss;

[0056] 220 - Fixing block; 221 - Front fixing block; 2211 - Mounting positioning groove; 2212 - Through hole; 2213 - Front clearance groove; 222 - Rear fixing block; 2221 - Rear fixing plate; 2222 - First connecting boss; 2223 - First connecting through hole; 2224 - Rear clearance groove;

[0057] 230 - Angle adjustment mechanism; 231 - Vertical rotating frame; 2311 - Second connecting boss; 2312 - Second connecting through hole; 232 - Horizontal rotating frame; 2321 - Base plate; 2322 - U-shaped frame; 2323 - Third connecting through hole; 2324 - Second fixing hole for camera; 2325 - Countersunk hole;

[0058] 300 - Handrail assembly; 310 - Handrail; 320 - First connecting flange; 321 - Flange; 322 - Cylindrical boss; 323 - Flange slot; 330 - Second connecting flange; 400 - Counterweight plate. Detailed Implementation

[0059] The technical solutions protected by this invention will now be described in detail with reference to the accompanying drawings and embodiments. However, it is obvious that the described embodiments are only some, not all, of the embodiments described herein. All other embodiments obtained by those skilled in the art based on the described embodiments without creative effort are within the scope of protection of this application.

[0060] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0061] Example 1

[0062] See Figures 1-3 The calcaneal bone recognition system provided in this embodiment includes a recognition platform 100, a calcaneal bone recognition component 200, and a handrail component 300.

[0063] In this embodiment, the calcaneal recognition component 200 includes a camera 210, which is placed inside the recognition platform 100, and there is a height distance between the camera 210 and the upper surface of the recognition platform 100.

[0064] In this embodiment, the handrail assembly 300 and the camera 210 are arranged opposite to each other, forming a standing area on the recognition platform 100 between the handrail assembly 300 and the camera 210. A left foot guide line a, a right foot guide line b, and a standing warning line c are respectively set within the standing area. The left foot guide line a, right foot guide line b, and standing warning line c are located within the triangular area formed by the camera 210's field of view from above. The standing warning line c is positioned close to the camera 210. The direction of the left foot guide line a is consistent with the direction of the left boundary line of the camera 210's field of view, and the direction of the right foot guide line b is consistent with the direction of the right boundary line of the camera 210's field of view. Simultaneously, there is an angle between the left foot guide line a and the standing warning line c, and the left foot guide line a and right foot guide line b are symmetrically distributed about the center point of the standing warning line c. The lower boundary of the camera 210's imaging field of view coincides with the standing warning line c, and the center line of the camera 210's imaging field of view coincides with the central dividing line between the left foot guide line a and the right foot guide line b.

[0065] In this embodiment, the handrail assembly 300 is placed on the recognition platform 100. The handrail assembly 300 is positioned opposite the camera 210. One end of the left foot guide line a is close to and connected to the standing warning line c, and the other end extends along the boundary line on the left side of the field of view of the camera 210 to the handrail assembly 300.

[0066] In this embodiment, the height of the camera 210 from the upper surface of the recognition platform 100 is H1, the longitudinal shooting angle of the camera 210 is α, and the vertical distance from the standing warning line c to the calcaneal recognition component 200 is H2. Therefore, the imaging height at the standing warning line c is calculated to be H4.

[0067] The formula for calculating H4 is:

[0068] If H2×tan(1 / 2α)≥H1, H4=tan(1 / 2α)+H1;

[0069] If H2×tan(1 / 2α)

[0070] In this embodiment, the vertical distance between the standing warning line c and the calcaneal bone recognition component 200 is H2, which refers to the distance between the standing warning line c and the position of the calcaneal bone recognition component 200 projected on the recognition platform 100.

[0071] Preferably, the height H1 of the camera 210 from the upper surface of the recognition platform 100 is 85mm, the longitudinal shooting angle α of the camera 210 is 42.75°, and the vertical distance H2 from the standing warning line c to the calcaneal recognition component 200 is 206mm. Therefore, the image height H4 at the standing warning line c can be calculated to be 161.25mm.

[0072] ​In this embodiment, the horizontal shooting angle of the camera 210 is β, the intersection point between the left foot guide line a and the standing warning line c is A, the intersection point between the right foot guide line b and the standing warning line c is B, the distance between A and B is H3, and the angle between the left foot guide line a and the standing warning line c is γ.

[0073] Preferably, the horizontal shooting angle β of the camera 210 is 57°, and H3 is 75mm; the angle γ between the left foot guide line a and the standing warning line c is 97.5°; at this time, the angle between the left foot guide line a and the right foot guide line b is 15°.

[0074] In this embodiment, the included angle γ is preferably 97.5°, between the left foot guide line a and the standing warning line c, because after the measurer stands according to the two guide lines, sufficient space should be reserved for the left and right feet; when the distance H3 is preferably 75mm, it can be ensured that when the child stands as required at the standing warning line c, the feet will not interfere with each other due to insufficient space. At this time, it can be ensured that the guide mark can guide the human body to stand more accurately and improve the detection accuracy.

[0075] Preferably, the height of the handrail assembly 300 is 100cm, and the distance between the handrail assembly 300 and the standing warning line c is 48cm.

[0076] In this embodiment, since the installation height of the camera 210 is higher than the upper surface of the recognition platform 100, when the shooting area of ​​the camera 210 falls on the recognition platform 100, its field of view is triangular from above. The extension lines of the left foot guide line a and the right foot guide line b are inside this triangle, and the direction of the left foot guide line a is consistent with the direction of the left boundary line of the field of view of the camera 210, while the direction of the right foot guide line b is consistent with the direction of the right boundary line of the field of view of the camera 210. When the left foot and right foot stand on the corresponding left foot guide line a and right foot guide line b on the recognition platform 100, the line connecting the heel and the midpoint of the second toe (the center line of the foot) coincides with the aforementioned guide lines. Compared to the traditional parallel standing posture, In this embodiment, the positioning is determined by the left foot guide line a and the right foot guide line b, ensuring that the captured calcaneal image is free from errors due to camera angle deviation, thus guaranteeing the accuracy and validity of the measurement results. Simultaneously, when standing, the distance between the handrail assembly 300 and the standing warning line c is 48cm. When the patient is a small child requiring support, they can grasp the lower part of the handrail assembly 300 within their arm span to maintain a standing position, thereby increasing the accuracy of the test results. The handrail assembly 300 is 100cm high, allowing the patient to easily grasp the upper part, stabilizing their center of gravity and quickly adjusting their position, ensuring good safety and more accurate measurements.

[0077] Example 2

[0078] Based on Embodiment 1, in the calcaneal recognition system provided in this embodiment, the calcaneal recognition component 200 further includes an angle adjustment mechanism 230 placed within the recognition platform 100. The camera 210 is movably connected to the angle adjustment mechanism 230. The camera 210 is adjusted and calibrated by adjusting the pitch angle in the vertical direction and the rotation angle in the horizontal direction through the angle adjustment mechanism 230, so that the lower boundary of the image of the camera 210 is on the standing warning line c, and the center line of the imaging field of view coincides with the central dividing line between the left foot guide line a and the right foot guide line b.

[0079] See Figure 9 In this embodiment, an exemplary implementation of the angle adjustment mechanism 230 is provided. The angle adjustment mechanism 230 includes a vertical rotating frame 231 and a horizontal rotating frame 232 movably connected to the vertical rotating frame 231. The camera 210, the vertical rotating frame 231, and the horizontal rotating frame 232 are sequentially movably connected. The camera 210, driven by the vertical rotating frame 231, rotates in the vertical direction to adjust the pitch angle of the camera 210. The camera 210, driven by the horizontal rotating frame 232, rotates in the horizontal direction to adjust the rotation angle in the horizontal direction. This calibrates the pitch and rotation angles of the camera 210, ensuring the consistency between the final image and the design, and guaranteeing the accuracy of subsequent measurement data processing.

[0080] See Figure 1 and Figure 2 The calcaneal recognition system provided in this embodiment has a mounting boss 110 on the recognition platform 100. The mounting boss 110 is perpendicular to the upper surface of the recognition platform 100. A camera mounting slot 1101 is provided on the side wall of the mounting boss 110. The camera mounting slot 1101 penetrates the two side walls of the mounting boss 110. A camera adjustment hole 1102 is provided on the top of the mounting boss 110. The camera 210 is placed in the camera mounting slot 1101.

[0081] See Figure 4 and Figure 5To facilitate the fixing of the camera 210, a camera mounting groove 1101 is provided on the side wall of the mounting boss 110 on one side of the guide line. A camera pressing edge 1103 is matched and connected to the groove of the camera mounting groove 1101. The camera pressing edge 1103 is a rounded rectangular frame. One side of the camera pressing edge 1103 is matched and connected to the camera mounting groove 1101 through the pressing edge fixing hole 1111. A camera cover plate fixing groove 1104 is provided on the other side of the camera pressing edge 1103. The camera cover plate 1105 is stuck in the camera cover plate fixing groove 1104 and is connected and fixed with the camera cover plate fixing hole 1109 provided on the camera mounting groove 1101. On the other side of the guide line, a camera rear mount mounting groove 1112 is provided on the side wall of the mounting boss 110. The camera rear mount 1106 is snapped into the camera rear mount mounting groove 1112. Second rear mount fixing holes 1110 are respectively provided on the opposite inner walls of the camera rear mount mounting groove 1112. A first rear mount fixing hole 1107 and a first camera fixing hole 1108 are provided on the camera rear mount 1106. The first camera fixing hole 1108 is movably connected to the horizontal rotating bracket 232 with screws. The first rear mount fixing hole 1107 matches and is fixedly connected to the second rear mount fixing hole 1110.

[0082] Specifically, the recognition platform 100 has a rectangular structure, and the mounting boss 110 is located between the two long sides of the recognition platform 100. The mounting boss 110 is located on the short left side of the recognition platform 100. The mounting boss 110 and the recognition platform 100 form an L-shaped structure. The camera 210 is placed in the camera mounting slot 1101. One end of the camera 210 (the camera end) faces the short right side of the recognition platform 100 and is fixed and sealed by the camera pressing edge 1103 and the camera cover plate 1105. The other end of the camera 210 is fixed by the camera back seat 1106.

[0083] Example 3

[0084] See Figure 9 To ensure the stability of the camera 210 during installation and use, the calcaneal recognition component 200 also includes a fixing block 220 installed in the recognition platform 100. The camera 210 is fixed on the fixing block 220, and the fixing block 220 is movably connected to the angle adjustment mechanism 230.

[0085] Preferably, the fixing block 220 is movably connected to the vertical rotating frame 231.

[0086] The fixing block 220 includes a front fixing block 221 and a rear fixing block 222.

[0087] See Figure 10The front fixing block 221 has an installation positioning groove 2211 inside, and a through hole 2212 is opened on the end face of the front fixing block 221. The camera 210 is embedded in the installation positioning groove 2211, and the camera 210 passes through the installation positioning groove 2211 and extends out of the front fixing block 221 through the through hole 2212 to the outside of the front fixing block 221. The front fixing block 221 and the rear fixing block 222 are engaged, and the rear fixing block 222 is movably connected to the vertical rotating frame 231.

[0088] See Figure 11 The camera 210 includes a main housing 2101, a stabilizing boss 2102, and a lens barrel 2103. The lens barrel 2103 is connected to the main housing 2101 via the stabilizing boss 2102. The main housing 2101 is embedded in a mounting and positioning groove 2211, and the stabilizing boss 2102 is engaged with the mounting and positioning groove 2211. The lens barrel 2103 passes through the mounting and positioning groove 2211 and extends out of the front fixing block 221 through the through hole 2212. A limiting boss 2105 is provided on the side wall of the main housing 2101.

[0089] The mounting positioning groove 2211 is preferably a square structure. It is a stepped structure composed of a first groove and a second groove, with the first groove being larger than the second. The main body shell 2101 is embedded in the first groove, and the stabilizing boss 2102 is secured in the second groove. The height of the stabilizing boss 2102 is 1.7 mm, and the depth of the second groove is 1.5 mm. The difference between the height of the stabilizing boss 2102 and the depth of the second groove is 0.2 mm, thus ensuring that the stabilizing boss 2102 can fully contact the end face of the second groove, guaranteeing the relative perpendicularity between the lens barrel 2103 and the front fixing block 221. The dimensions of the second groove are 29 mm long × 29 mm wide × 1.5 mm deep. Front clearance grooves 2213 are formed on the two symmetrical interiors of the mounting positioning groove 2211.

[0090] To match the square mounting and positioning groove 2211, the through hole 2212 is a cross-shaped slot with an arc-shaped inner wall. To ensure the installation stability of the lens barrel 2103, an adjusting screw 2104 is provided on the outer wall of the lens barrel 2103. When the lens barrel 2103 passes through the through hole 2212, the adjusting screw 2104 remains within the through hole 2212, thus meeting the application requirements of the lens barrel 2103 in four different working conditions: up, down, left, and right. For example, if the actual required image is in landscape or inverted position, the lens barrel 2103 only needs to be rotated 90 degrees or 180 degrees for installation.

[0091] See Figure 12 and Figure 13The rear fixing block 222 includes a rear fixing plate 2221, which has a C-shaped structure. The C-shaped opening of the rear fixing plate 2221 is opposite to the mounting and positioning groove 2211 of the front fixing block 221, and both ends are fixed by bolts. This allows the main body shell 2101 to be embedded in the first groove and then clamped and positioned by the rear fixing plate 2221. A first connecting boss 2222 is provided on the outer wall of the C-shaped structure. A first connecting through hole 2223 is provided along the first connecting boss 2222. The first connecting through hole 2223 is movably connected to the vertical rotating frame 231 by a shoulder bolt and serves as a vertical rotating structure. The diameter of the first connecting through hole 2223 matches the optical axis diameter of the shoulder bolt.

[0092] A rear clearance groove 2224 is also provided on the inner wall of the rear fixing plate 2221. The front clearance groove 2213 and the rear clearance groove 2224 are in the same position and width. When the camera 210 is stuck between the front fixing block 221 and the rear fixing block 222, the limiting boss 2105 is stuck in the front clearance groove 2213 and the rear clearance groove 2224, which effectively prevents the camera from axially shaking during use.

[0093] The side wall height of the rear fixing plate 2221 is 12mm, and a 1.2mm gap is reserved between the front fixing block 221 and the rear fixing block 222 to ensure the stability of the connection. The first connecting boss 2222 is located in the center area of ​​the rear fixing block 222 and is designed with a rounded chamfer. This structure is conducive to the adjustment of the camera's tilt angle, and the reserved vertical space ensures that the angle adjustment is maximized, with a rotation angle range of -50° to +50°.

[0094] See Figure 14 The vertical rotating frame 231 is a C-shaped frame. The first connecting boss 2222 is fitted into the C-shaped frame, and symmetrical fixing holes are opened on the two side walls of the C-shaped frame. The first connecting through hole 2223 is located on the same horizontal line through the two fixing holes, and the first connecting boss 2222 and the C-shaped frame are connected by a shoulder bolt. A second connecting boss 2311 is provided on the outer side wall of the C-shaped structure. Both the second connecting boss 2311 and the first connecting boss 2222 are circular bosses, and their axes are perpendicular to each other. A second connecting through hole 2312 is provided on the second connecting boss 2311. The vertical rotating frame 231 is movably connected to the horizontal rotating frame 232 through the second connecting through hole 2312, thereby adjusting the horizontal rotation of the camera 210. The rotation angle range is -40° to +40°, realizing the adjustment of the downward viewing angle of the camera 210.

[0095] See Figure 15The horizontal rotating frame 232 includes a base plate 2321 and a U-shaped frame 2322 placed on the base plate 2321. The base plate 2321 is bolted into the recognition platform 100. Third connecting through holes 2323 are provided on the two side walls of the U-shaped frame 2322. A second connecting boss 2311 is inserted into the U-shaped frame 2322. The second connecting through hole 2312 and the third connecting through hole 2323 are located on the same horizontal line. The second connecting through hole 2312 is movably connected to the U-shaped frame 2322 by a shoulder bolt. Two second camera fixing holes 2324 are also provided on the base plate 2321, located on both sides of the U-shaped frame 2322. The second camera fixing holes 2324 are bolted to the first camera fixing hole 1108 on the recognition platform 100, thus connecting the horizontal rotating frame 232 to the camera rear seat 1106 on the recognition platform 100.

[0096] A countersunk hole 2325 is also provided on the opposite outer side wall of the U-shaped frame 2322. When the second fixing hole 2324 of the camera is connected to the first fixing hole 1108 of the camera on the recognition platform 100, the nut that cooperates with it will be stuck in the countersunk hole 2325 to achieve the automatic locking function.

[0097] In this embodiment, when adjusting the top and bottom angles of the camera 210, the shoulder bolts that movably connect the second connecting boss 2311 and the vertical rotating frame 231 are adjusted using external tools. This allows the calcaneal recognition component 200 to be installed inside the recognition platform 100, ensuring that the base of the triangular area in the image of the lens barrel 2103 on the camera 210 coincides with the standing warning line c. After the calcaneal recognition component 200 is installed, since it is difficult to operate by hand or tools in a confined space, and the tilt angle of the camera 210 must remain unchanged, it is necessary to adjust its rotation angle without disassembling the calcaneal recognition component 200. This can be achieved by fine-tuning the shoulder bolts through the camera adjustment hole 1102. The tilt and rotation angles of the camera 210 can be adjusted using the above method. At the same time, the nut that cooperates with it will be locked in the countersunk hole 2325 to achieve an automatic locking function, ensuring the stability of the calcaneal recognition component 200.

[0098] Example 4

[0099] See Figure 1 The calcaneal recognition system provided in this embodiment has a recognition platform 100 formed by fastening together an upper base 101 and a lower base 102, and has a cuboid structure with a hollow interior.

[0100] In this embodiment, the mounting boss 110, left foot guide line a, right foot guide line b, standing warning line c, and handrail assembly 300 are all mounted on the upper base 101.

[0101] See Figure 6 and Figure 7 In this embodiment, the upper base 101 is a rounded rectangular shell with a long mounting boss 110 on one side. An upper groove is provided in the lower part of the upper base 101. The lower base 102 is a shell with a rounded rectangular outer contour and a certain thickness. A lower groove is provided in the middle part of the upper surface of the lower base 102. A lower base fixing hole 1021 is provided on the outer periphery of the lower groove and at the position of the short side of the rectangle. A corresponding upper base fixing hole is provided on the upper base 101. The upper groove of the upper base 101 is fastened to the lower base 102. The upper base fixing hole and the lower base fixing hole 1021 are connected to connect the upper base 101 and the lower base 102 into one unit.

[0102] See Figure 6 In this embodiment, an adapter 120 is also provided on the side wall of the upper base 101. The adapter 120 is a data transmission conversion component.

[0103] Preferably, there are two adapters 120, specifically including a first adapter and a second adapter. The first adapter is used to connect to an external device, such as an image processing unit, and the second adapter is used to connect to a camera 210.

[0104] See Figure 6 An adapter mounting groove 130 is provided on the side wall of the upper base 101. The adapter 120 is placed in the adapter mounting groove 130, and the outer end face of the adapter 120 is flush with the outer surface of the adapter mounting groove 130 to ensure aesthetics.

[0105] See Figure 6 In the cavity inside the recognition platform 100, ribs 140 are provided in the upper groove of the upper base 101 and the lower groove of the lower base 102. There are multiple ribs 140, which are distributed in a grid pattern to ensure the mechanical strength of the tester standing on the equipment.

[0106] See Figure 6 In this embodiment, a camera cable tray 150 is provided on the upper base 101 in the cavity inside the recognition platform 100. A cable channel cover plate fixing hole 170 is provided on the inner wall of the camera cable tray 150. The cable channel cover plate 160 is fixed to the camera cable tray 150 through the cable channel cover plate fixing hole 170. The cable channel cover plate 160 is located in the cavity inside the recognition platform 100. A cavity channel is formed between the camera cable tray 150 and the cable channel cover plate 160, which is more conducive to the installation, replacement and maintenance of the camera 210 in the calcaneal recognition component 200, and ensures that the internal wiring of the device is unobstructed.

[0107] See Figure 7In this embodiment, an adapter clearance groove 1024 is provided on the side wall of the lower base 102. The adapter clearance groove 1024 is positioned corresponding to the adapter 120. The purpose is to prevent the adapter 120 from interfering with the lower base 102 during installation.

[0108] See Figure 8 In this embodiment, a handle position 1022 is also provided on the lower base 102. The handle position 1022 is a rounded rectangular groove, with one on each of the short sides of the lower base 102. The handle position 1022 is formed by CNC milling after multiple plates are stacked and bonded into a whole, rather than milling a whole piece of raw material, which can reduce the manufacturing cost to a certain extent while ensuring strength.

[0109] See Figure 1 The calcaneal bone recognition system provided in this embodiment also includes a counterweight plate 400 disposed inside the recognition platform 100; the handrail 310 passes through the upper surface of the recognition platform 100 and is connected to the counterweight plate 400.

[0110] Specifically, a counterweight plate 400 is also provided in the lower groove. The counterweight plate 400 is connected and fixed to the lower base 102, and the handrail assembly 300 placed on the upper base 101 is also connected to the counterweight plate 400.

[0111] Specifically, the counterweight plate 400 is a rectangular carbon steel plate with a certain thickness. Preferably, the counterweight plate has dimensions of 990mm × 370mm × 20mm (length × width × height) and is made of Q235 carbon steel. When installed inside the calcaneal device, calculations show that its center of gravity is 280mm from the side plate and 36mm from the top. If the weight of its center of gravity is considered as a point mass, it is 78Kg. Since the person being measured is a child in the growth and development stage, when the person being measured grasps the handrail, it should be at 750mm above the handrail. Through leverage calculations, 780N × 280mm / (750-36)mm can be obtained. At the handrail, it can withstand a horizontal lateral force of about 300N. The weight of the person being measured (a child in the growth and development stage) should mostly be below 30Kg. Therefore, it can effectively prevent the device from tipping over when the person using the handrail assembly 300, thus improving the stability of the device.

[0112] See Figure 7 In this embodiment, a lower base rib 1023 is provided on the outer periphery of the lower groove of the lower base 102 and along the length of the lower base 102. This not only strengthens the mechanical strength of the lower base 102, but also prevents the risk of the lower base 102 shell breaking when the equipment is lifted due to the excessive weight of the counterweight plate 400.

[0113] See Figure 7In this embodiment, an anti-slip pad 103 is provided on the bottom surface of the lower base 102. The anti-slip pad 103 is a square rubber pad with adhesive backing. An anti-slip pad mounting position is provided on the bottom surface of the lower base 102, and the anti-slip pad 103 is pasted and fixed on the anti-slip pad mounting position.

[0114] Based on the rectangular structure of the lower base 102, there are two or four anti-slip pads 103. When there are two anti-slip pads 103, one is distributed on each of the two short sides of the lower base 102; when there are four anti-slip pads 103, one is set at each of the four corners of the lower base 102.

[0115] Example 5

[0116] See Figure 1 In this embodiment, the handrail assembly 300 includes a handrail 310, a first connecting flange 320, and a second connecting flange 330.

[0117] The handrail 310 is a U-shaped structure composed of two parallel round tubes and one bent tube. The bottom ends of the two round tubes are connected to the first connecting flange 320 and the second connecting flange 330 via threads, and the top ends are connected by the U-shaped structure formed by the bent tube. The diameter of the handrail bent tube is 40mm, and it is formed by round tube bending and welding processes, which helps to improve the overall structural strength of the handrail.

[0118] See Figure 16 The first connecting flange 320 includes a flange 321 and a cylindrical boss 322 disposed on the flange 321. An external thread is provided on the round pipe, and an internal thread matching the external thread is provided on the cylindrical boss 322. The round pipe is connected to the cylindrical boss 322 via the thread. Multiple flange slots 323 are distributed around the outer circumference of the cylindrical boss 322 on the flange 321. The counterweight plate 400 is connected to the first connecting flange 320 through the flange slots 323.

[0119] In this embodiment, the structure of the second connecting flange 330 is the same as that of the first connecting flange 320. Referring to the connection method of the first connecting flange 320, the counterweight plate 400 is connected to the second connecting flange 330 through the flange slot 323 provided on the second connecting flange 330, and another round pipe is connected and fixed to the cylindrical boss 322 on the second connecting flange 330 by means of threaded connection.

[0120] In this embodiment, the flange elongated slot 323 is an oblong slot, which allows the first connecting flange 320 to rotate slightly axially, facilitating alignment and connection with the counterweight plate 400. Correspondingly, a flange connection hole is provided on the counterweight plate 400, which facilitates fixing the flange connection hole and the flange elongated slot 323 with bolts, thereby connecting the first connecting flange 320 to the counterweight plate 400, and connecting the second connecting flange 330 to the counterweight plate 400.

[0121] In this embodiment, the handrail 310 is provided with a handrail shell. Preferably, the handrail shell is a plastic part and is bonded and fixed to the handrail 310 as a whole.

[0122] See Figures 1-3 To facilitate the installation of the handrail assembly 300, a handrail cover plate mounting groove 180 is provided on the upper base 101, and a handrail cover plate 190 is embedded in the handrail cover plate mounting groove 180.

[0123] See Figure 17 and Figure 18 The handrail cover 190 has a rounded rectangular structure. An upward-facing groove is formed on the bottom of the handrail cover 190. A handrail mounting clearance hole 1901 is provided on the handrail cover 190, through which the round tube of the handrail assembly 300 passes to connect with the counterweight plate 400. The handrail cover 190 also has a handrail cover fixing hole 1902, through which the handrail cover 190 is connected to the counterweight plate 400 for securing the handrail cover 190. A handrail cover reinforcing rib 1903 is provided within the groove to enhance the mechanical strength of the handrail cover 190 and prevent damage to the equipment caused by unintentional standing or stepping on it by a tester.

[0124] In this embodiment, the vertical distance between the handrail 310 and the standing warning line c is 48cm. When the patient is a small child standing with support, there is a risk of falling due to the small distance between the feet in the standing position. However, due to the presence of the handrail assembly 300, the patient can hold the lower part of the handrail assembly 300 within their arm span to maintain their position, thereby increasing the accuracy of the detection results. For larger patients, when standing in the required position, there may be instability in the center of gravity when adjusting their position. Since the height of the handrail 310 is 100cm, the patient can easily grasp the upper part of the handrail to stabilize their center of gravity and quickly adjust their position.

[0125] Example 6

[0126] This embodiment provides a calcaneal bone identification method, including the following steps:

[0127] S1. Based on the imaging field of the camera 210 and the requirements of the acquired calcaneal image, the positions of the camera 210, the left foot guide line a, the right foot guide line b, and the standing warning line c are set on the recognition platform 100.

[0128] In this step, the positions of camera 210, left foot guide line a, right foot guide line b, and standing warning line c are arranged according to the positions in embodiment 1.

[0129] Preferably, the vertical shooting angle α of the camera 210 is 42.75°, the horizontal shooting angle β of the camera 210 is 57°, the height H1 of the camera 210 from the upper surface of the recognition platform 100 is 85mm, the vertical distance H2 from the standing warning line c to the calcaneal recognition component 200 is 206mm, the distance H3 between the left foot guide line a and the standing warning line c is 75mm, and the angle γ between the left foot guide line a and the standing warning line c is 97.5°. Therefore, the image height H4 at the standing warning line c can be calculated to be 168mm.

[0130] S2. The subject stands on the recognition platform 100 with his back to the camera 210, and the direction and position of the center line of his left foot corresponds to the left foot guide line a; the direction and position of the center line of his right foot corresponds to the right foot guide line b.

[0131] Specifically, when standing, the center line of the foot and the corresponding guide line of the left and right feet coincide respectively. The center line of the foot refers to the line connecting the heel and the midpoint of the second toe.

[0132] S3, the lower boundary of the imaging field of camera 210 is on the standing warning line c, and the center line of the imaging field coincides with the central dividing line between the left foot guide line a and the right foot guide line b.

[0133] In step S3 of this embodiment, the tilt angle in the vertical direction and the rotation angle in the horizontal direction of the camera 210 are adjusted by the angle adjustment mechanism 230, so that the lower boundary of the imaging field of the camera 210 coincides with the standing warning line c, and the center line of the imaging field of the camera 210 coincides with the central dividing line between the left foot guide line a and the right foot guide line b.

[0134] S4. Turn on camera 210. Camera 210 recognizes the calcaneal image of the subject and then takes a picture to complete the calcaneal recognition.

[0135] Furthermore, to facilitate the processing of the identified calcaneal images, an image processing unit is set up around the identification platform 100. The image processing unit is electrically connected to the camera 210, so that the identified calcaneal images are transmitted to the image processing unit through the adapter 120. Existing analysis and processing methods are used to obtain calcaneal data, which facilitates understanding of the growth of the calcaneus.

[0136] In this embodiment, the principle of calcaneal bone measurement is as follows: Figure 19 As shown, taking the guide line and the lateral angle of the camera described in this invention as an example, the explanation is based on the measurement of the right calcaneus.

[0137] If we consider the most prominent points of the medial and lateral malleoli of the right calcaneus and the midline of the foot as approximately a horizontal line viewed from above, the following relationships can be established. Figure 19Point O is the midpoint between the medial malleolus (point A) and the lateral malleolus (point B). 57° is the lateral shooting angle of camera 210. The image point of point O on camera 210 is point O'. The straight line passing through point O and point O' is the right foot guide line b. Points A and B represent the standing posture where the right foot is perpendicular to the standing warning line c, i.e., parallel standing. Let the distance AO from point A to point O and the distance BO from point B to point O both be 10cm. At this time, the image coordinates of points A and B on the camera are points A' and B', respectively. The distance A' from point O' is A'O', which is 8.37cm, and the distance B' from point O' is B'O', which is 8.71cm. Points A1 and B1 represent the standing posture where the line connecting the midpoint of the heel and the second toe (the center line of the foot) coincides with the right foot guide line b. 1. The distances from point O to points A1O and B1O are 10cm. At this distance, the imaging coordinates of points A1 and B1 on the camera are points A1` and B1`, respectively. The distances from point A1` to point O` are A1`O` and B1`O`, respectively. When standing according to the guide lines of this invention, the error between the A1`O` / B1`O` ratio and the A1O / B1O ratio is smaller, which is better than the error between the A`O` / B`O` ratio and the AO / BO ratio when standing in parallel. Therefore, when identifying the calcaneal image by standing with the three guide lines set in Embodiment 1 of this invention, the measurement error of the ratio of the calcaneal and medial malleoli to the midline of the foot can be reduced, ensuring the accuracy of the measurement results.

[0138] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A calcaneal bone recognition system, characterized in that, It includes a recognition platform (100), a calcaneal recognition component (200), and a handrail component (300). The calcaneal recognition component (200) includes a camera (210), and the armrest component (300) and the camera (210) are respectively placed on the upper surface of the recognition platform (100); The handrail assembly (300) and the camera (210) are arranged opposite to each other, forming a standing area on the recognition platform (100) between the handrail assembly (300) and the camera (210). A left foot guide line (a), a right foot guide line (b), and a standing warning line (c) are respectively set within the standing area. The standing warning line (c) is positioned close to the camera (210). One end of the left foot guide line (a) is connected to the standing warning line (c), and the other end of the left foot guide line (a) extends along the left boundary line of the camera's (210) imaging field of view towards the handrail assembly (300). The hand assembly (300) extends; one end of the right foot guide line (b) is connected to the standing warning line (c), and the other end of the right foot guide line (b) extends to the handrail assembly (300) along the left boundary line of the imaging field of the camera (210); the left foot guide line (a) and the center point about the standing warning line (c) are symmetrically distributed; the lower boundary of the imaging field of the camera (210) coincides with the standing warning line (c), and the center line of the imaging field of the camera (210) coincides with the central dividing line between the left foot guide line (a) and the right foot guide line (b); The angle γ between the left foot guide line (a) and the standing warning line (c) is 97.5°, and the distance between the intersection of the left foot guide line (a) and the standing warning line (c) and the intersection of the right foot guide line (b) and the standing warning line (c) is 75mm.

2. The calcaneal bone recognition system according to claim 1, characterized in that, The handrail assembly (300) includes a handrail (310); the handrail (310) is placed on the upper surface of the recognition platform (100); the height of the handrail (310) is 100cm, and the vertical distance between the handrail (310) and the standing warning line (c) is 48cm.

3. The calcaneal bone recognition system according to claim 2, characterized in that, The height of the camera (210) from the upper surface of the recognition platform (100) is H1, the vertical distance from the standing warning line (c) to the camera (210) is H2, and the longitudinal shooting angle of the camera (210) is α. Therefore, the calculated image height at the standing warning line (c) is H4; the formula for calculating H4 is: If H2×tan(1 / 2α)≥H1, H4 = tan(1 / 2α) + H1; If H2×tan(1 / 2α)<H1, H4 = 2×tan(1 / 2α).

4. The calcaneal bone recognition system according to claim 3, characterized in that, The height H1 of the camera (210) from the upper surface of the recognition platform (100) is 85mm, the vertical distance H2 of the standing warning line (c) from the camera (210) is 206mm, and the longitudinal shooting angle α of the camera (210) is 42.75°. Therefore, the height H4 of the image at the standing warning line (c) is 161.25mm.

5. The calcaneal bone recognition system according to any one of claims 2-4, characterized in that, The calcaneal recognition component (200) further includes an angle adjustment mechanism (230). A mounting boss (110) is provided on the recognition platform (100). The mounting boss (110) is perpendicular to the upper surface of the recognition platform (100). The camera (210) is placed inside the mounting boss (110) through the angle adjustment mechanism (230). A camera adjustment hole (1102) is provided on the top of the mounting boss (110). The camera adjustment hole (1102) is positioned opposite to the angle adjustment mechanism (230).

6. The calcaneal bone recognition system according to claim 5, characterized in that, The angle adjustment mechanism (230) includes a vertical rotating frame (231) and a horizontal rotating frame (232) movably connected to the vertical rotating frame (231), and the camera (210) is movably connected to the vertical rotating frame (231).

7. The calcaneal bone recognition system according to claim 6, characterized in that, The calcaneal recognition component (200) also includes a fixing block (220) disposed within the recognition platform (100), the camera (210) is fixed on the fixing block (220), and the fixing block (220) is movably connected to the angle adjustment mechanism (230).

8. The calcaneal bone recognition system according to claim 7, characterized in that, The fixing block (220) includes a front fixing block (221) and a rear fixing block (222). The front fixing block (221) has an installation positioning groove (2211) inside and a through hole (2212) on the end face of the front fixing block (221). The camera (210) is embedded in the installation positioning groove (2211). The camera (210) passes through the installation positioning groove (2211) and extends out of the through hole (2212) to the outside of the front fixing block (221). The front fixing block (221) and the rear fixing block (222) are engaged. The rear fixing block (222) is movably connected to the vertical rotating frame (231).

9. The calcaneal bone recognition system according to claim 8, characterized in that, The calcaneal recognition system also includes a counterweight plate (400) disposed inside the recognition platform (100); the handrail (310) passes through the upper surface of the recognition platform (100) and is connected to the counterweight plate (400).

Images