Plantar pressure acquisition device of flexible force sensor

Abstract

The utility model relates to a plantar pressure collecting device of a flexible force sensor. The plantar pressure collecting device comprises a flexible force sensitive insole sensor device, a box cover, a TF card, a PCB, a battery and a base. The flexible force-sensitive insole sensor device comprises a flexible force-sensitive insole sensor and a customized pressure acquisition block, the customized pressure acquisition block is placed in a shoe, and a foot sole directly steps on the customized pressure acquisition block; the battery is electrically connected with the PCB, provides power for the whole device and is connected to the PCB through soldering tin. The box cover and the base form a control box, the device PCB and the battery are protected, and the device can be conveniently fixed to the shank of a person. The flexible force sensor is simple in structure and convenient to wear, a large number of flexible sensors with high response are obtained by improving the structure of the flexible force sensor, and the customized pressure contact area is adopted, so that foot sizes of different persons are met, and pressure data are collected more accurately.

Description

Technical Field

[0001] The utility model belongs to the technical field of plantar pressure measurement, and in particular relates to a plantar pressure acquisition device of a flexible force-sensitive sensor. Background Art

[0002] Real-time monitoring of pressure distribution during a person's movements is crucial for assessing movement quality and correcting incorrect posture. By monitoring pressure distribution during movement, we can determine whether the person maintains correct posture and technical requirements during the movement. Abnormal pressure distribution patterns during movement indicate problems with movement quality. Monitoring can identify issues promptly, providing participants with exercise health guidance and feedback, helping to improve exercise quality and recovery.

[0003] Currently, there are patents using pressure sensing monitoring. The patent application with application number 202011024250.0 discloses a gait monitoring insole with a pressure sensor. The insole includes a base with a pressure sensor and a control circuit module. When only a pressure sensor is used, the wearer's gait status can be identified and relevant data information can be sent to the wearer's receiving device, thereby achieving the purpose of gait monitoring.

[0004] Patent application No. 202211422225.7 discloses an insole-type pressure sensor electrode layer provided with a plurality of interdigitated electrodes and an integrated circuit, wherein the integrated circuit is connected to the plurality of interdigitated electrodes; the processor is used to collect and calculate the collected data, detect the pressure data in real time, and present the results through visual methods such as heat maps and force value maps.

[0005] Traditional pressure insoles are suitable for collecting the plantar pressure of normal people when walking and used to analyze their walking data. There is a lack of pressure measurement equipment for extreme sports. Therefore, this utility model proposes a plantar pressure collection device for flexible force-sensitive sensors to effectively solve the problem of pressure measurement during exercise. Utility Model Content

[0006] The utility model proposes a plantar pressure collection device with a flexible force-sensitive sensor. The pressure insole of the utility model is light in weight, has a large measuring range, a high sampling rate, a customized contact area, high comfort, batch production, and low cost, and can timely and accurately collect plantar pressure of a person during exercise.

[0007] To achieve the above-mentioned objectives, the present invention provides a plantar pressure acquisition device of a flexible force-sensitive sensor, which includes a flexible force-sensitive insole sensor device, a TF card, a PCB board, a battery, and a control box; the control box includes a box cover and a base, the flexible force-sensitive insole sensor device includes a flexible force-sensitive insole sensor and a customized pressure acquisition block, the customized pressure acquisition block is placed in the shoe, and the sole of the foot directly steps on the customized pressure acquisition block; the PCB board has a main board, on which an STM32F105 control chip, a filter capacitor, a CD4051 chip, and a data storage module are provided, and the TF card is inserted into the data storage module; the battery is electrically connected to the PCB board to provide power for the entire device, and is electrically connected to the PCB board through soldering; the control box protects the device PCB board and battery, and facilitates its fixation on the calf.

[0008] The beneficial effects of the utility model are:

[0009] 1. The utility model has a simple structure and is easy to wear. Personnel do not need to do too much operation. Personnel only need to wear training shoes, which does not interfere with personnel's normal training and competition, ensuring the safety of personnel use. The pressure insole with velvet on the surface is used to achieve a comfortable and non-slip effect.

[0010] 2. The flexible force-sensitive sensor applied for in the present utility model improves the structure of the flexible force-sensitive sensor to obtain a large number of highly responsive flexible sensors, adopts customized pressure contact areas to meet the foot sizes of different people and collect pressure data more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0012] Figure 1 This is the overall wearing diagram of the plantar pressure acquisition device of the flexible force-sensitive sensor of the utility model;

[0013] Figure 2 This is an overall diagram of the plantar pressure acquisition device of the flexible force-sensitive sensor of the utility model;

[0014] Figure 3 Schematic diagram of the pressure acquisition block customized for this utility model;

[0015] Figure 4 This is a schematic diagram of the structure of the control box base of the utility model;

[0016] Figure 5 This is a schematic diagram of the structure of the control box cover of the utility model;

[0017] Figure 6 This is a schematic diagram of the PCB board structure of the utility model;

[0018] Figure 7 This is a schematic diagram of the TF card of the utility model;

[0019] Figure 8 This is a schematic diagram of the battery of the utility model;

[0020] Figure 9 This is a schematic diagram of the flexible force-sensitive sensor of the utility model.

[0021] The accompanying drawings are numerals as follows:

[0022] Flexible force-sensitive insole sensor device 1, box cover 2, TF card 3, PCB board 4, battery 5, base 6; flexible force-sensitive insole sensor 110;

[0023] Fixing screw column 601, base screw hole 602, buckle 603, fixing step 604, switch hole 605, TF card removal port 606, cable hole 607;

[0024] Fixed waist hole 201, box cover screw hole 202;

[0025] Mainboard 401, control chip 402, filter capacitor 403, CD4051 chip 404, data storage module 405, LED indicator light 406, board screw holes 407, charging device 408, cable interface 409;

[0026] The first metatarsal region 101 , the second to fifth metatarsal regions 102 , the medial front heel region 103 , the medial rear heel region 104 , the lateral rear heel region 105 , the lateral front heel region 106 , the midfoot region 107 , the first to fifth phalanges region 108 , and the cable bundle 109 . DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0028] In this embodiment, a flexible force-sensitive sensor is used to collect plantar pressure. Figure 2As shown, the flexible force-sensitive insole sensor device 1 includes a cover 2, a TF card 3, a PCB board 4, a battery 5, and a base 6. The flexible force-sensitive insole sensor device 1 includes a flexible force-sensitive insole sensor 110 and a customized pressure acquisition block. The customized pressure acquisition block is placed in the shoe, and the sole of the foot directly steps on the customized pressure acquisition block. The battery 5 is electrically connected to the PCB board 4 to provide power for the entire device and is connected to the PCB board 4 via soldering. The cover 2 and base 6 form a control box, protecting the device PCB board 4 and battery 5, and facilitating the user's fastening to the calf.

[0029] like Figure 4 As shown, the base 6 of the control box is provided with a fixing screw column 601, four base screw holes 602, a buckle 603, a fixing step 604, a switch hole 605, a TF card removal port 606, and a cable hole 607.

[0030] like Figure 5 As shown, the cover 2 of the control box is a rectangular plate structure with a fixed waist hole 201 and four cover screw holes 202. The Velcro passes through the cover 2 to fix the waist hole 201 so that it is fixed at the calf. Figure 1 shown.

[0031] like Figure 6 As shown in FIG. 4 , the PCB board 4 has a main board 401, on which are provided an STM32F105 control chip 402, a filter capacitor 403, a cd4051 chip 404, a data storage module 405, an LED indicator light 406, a board screw hole 407, a charging device 408, and a cable interface 409. The flexible force-sensitive insole sensor 110 is electrically connected to the cable interface 409 via a cable. Figure 9 As shown; the battery 5 is fixed in the buckle 603 of the base 6, and its cable is soldered to the PCB board 4; the PCB board 4 is located above the battery 5 and is fixed to the fixing screw column 601 and the fixing step 604 by screws using the board screw hole 407; the STM32F105 control chip 402, CD4051 chip 404, filter capacitor 403, data storage module 405, LED indicator light 406 and charging device 408 are soldered to the PCB board 4, the TF card 3 is inserted into the data storage module 405, and a TF card removal port 606 is reserved on the side of the base 6 of the control box; the push-button power switch is fixed to the switch hole 605 on the side of the control box by means of a buckle and glue, and its connecting cable is soldered to the PCB board 4.

[0032] like Figure 3As shown, the customized pressure collection block of the present invention is electrically connected to the flexible force-sensitive insole sensor 110. The customized pressure collection block is in direct contact with the sole of the foot corresponding to the sole structure. The customized pressure collection block is divided into the 1st metatarsal area 101, the 2nd to 5th metatarsal areas 102, the medial front area of the heel 103, the medial rear area of the heel 104, the lateral rear area of the heel 105, the lateral front area of the heel 106, the midfoot area 107, and the 1st to 5th toe bone areas 108 that are in direct contact with the sole of the person's foot, as well as a cable bundle 109 connected to the above-mentioned areas for extracting electrical signals. The person puts the customized pressure collection block into the shoe, and the sole of the foot contacts the corresponding area of the customized pressure collection block. Of course, when the person exercises, the sole of the foot presses the corresponding area of the sensor, and the voltage value of the corresponding area changes, which fits the shape of the sole and effectively collects the pressure values of different areas.

[0033] In this embodiment, the STM32F105 control chip 402, the CD4051 chip 404, and the filter capacitor 403 constitute a signal acquisition device for signal acquisition. The filter capacitor 403 is electrically connected to the flexible force-sensitive insole sensor 110. The voltage signal generated by the flexible force-sensitive sensor 110 is transmitted to the filter capacitor 403 to remove high-frequency and low-frequency interference signals. The filter capacitor is electrically connected to the CD4051 chip 404 and transmits the signal to the CD4051 chip 404. The CD4051 chip 404 is electrically connected to the STM32F105 control chip 402. The STM32F105 control chip 402 opens different gates of the CD4051 chip 404 at a certain time frequency and reads the voltage signal of the corresponding gate. The STM32F105 control chip 402 performs digital filtering on the read voltage value and then converts the voltage value into a corresponding pressure value according to a pre-set conversion formula.

[0034] In the data storage device of this embodiment, the data storage module 405 is electrically connected to the STM32F105 control chip 402. After the STM32F105 control chip 402 completes the pressure value conversion, the completed pressure value is stored in the data storage module 405. The TF card 3 is electrically connected to the data storage module 405. The TF card 3 is inserted into the data storage module 405 and the voltage value is stored in the TF card 3 via the SPI protocol. A txt file of eight voltage values is formed, including the lateral front area 106 of the heel, the lateral rear area 105 of the heel, the medial front area 103 of the heel, the medial rear area 104 of the heel, the first metatarsal area 103, the first to fifth phalanges area 108, the second to fifth metatarsal area 102 and the midfoot area 107. The schematic diagram of the TF card 3 is shown in FIG. Figure 7 shown.

[0035] In this embodiment, the battery 5 is as follows Figure 8As shown, it has a rectangular structure; the battery 5 is electrically connected to the STM32F105 control chip 402, the STM32F105 control chip 402 controls the voltage value of the acquisition device, the power switch is electrically connected to the battery 5, and controls the opening and closing of the entire device. When the power switch is turned on, the pressure value begins to be read. Press the power switch twice in succession to pause writing to the TF card 3. Press the power switch once to write to the TF card 3 again. Press and hold the power switch for 3s, the LED indicator light 406 turns red, and the entire device is powered on. In order to better display the status of the entire device, the LED indicator light 406 is electrically connected to the STM32F105 control chip 402. When the acquisition device is turned off, the LED indicator light 406 is turned off. When the acquisition device is working, the green light flashes once every 2 seconds. When the acquisition device fails, the LED indicator light 406 shows a red light and flashes once every 0.5 seconds. The charging device 408 is electrically connected to the battery 5. When the battery 5 is charging, when the battery 5 is not full, the LED indicator light 406 shows a red light that is always on. When the battery is full, the LED indicator light 406 shows a green light that is always on.

[0036] In this embodiment, the control box includes a base 6 and a box cover 2; the base 6 is connected to the main board 401 by screws, the battery 5 is installed in the control box, the base 6 and the box cover 2 are connected through four base screw holes 602 and the box cover screw holes 202, and the control box is fixed to the person's leg by an elastic band or Velcro.

[0037] Compared with existing technologies:

[0038] The flexible force-sensitive sensor's plantar pressure acquisition device and the flexible force-sensitive insole sensor device are used to detect real-time plantar pressure signals during movement. The flexible force-sensitive insole sensor signal acquisition device is used to continuously convert pressure signal data into plantar pressure values through hardware filtering and transmit these values to a data storage module. The data storage device is used to store plantar pressure values during movement. A power supply manages the charging and discharging of the entire acquisition device. By placing an array of flexible force-sensitive sensors inside the insole, this device can sense plantar pressure distribution in real time during movement, providing powerful data support for training assessment and skill improvement.

[0039] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.

Claims

1. A plantar pressure acquisition device with a flexible force-sensitive sensor, characterized in that: The plantar pressure acquisition device of the flexible force-sensitive sensor includes a flexible force-sensitive insole sensor device, a TF card, a PCB board, a battery, and a control box; the control box includes a box cover and a base, and the flexible force-sensitive insole sensor device includes a flexible force-sensitive insole sensor and a customized pressure acquisition block. The customized pressure acquisition block is placed in the shoe, and the sole of the foot directly steps on the customized pressure acquisition block; the PCB board has a main board, on which an STM32F105 control chip, a filter capacitor, a CD4051 chip, and a data storage module are provided, and the TF card is inserted into the data storage module; the battery is electrically connected to the PCB board to provide power for the entire device, and is electrically connected to the PCB board through soldering; the control box protects the device PCB board and battery, and facilitates its fixation on the calf.

2. The plantar pressure acquisition device of the flexible force-sensitive sensor according to claim 1, characterized in that: The customized pressure collection block corresponds to the sole structure and is in direct contact with the sole of the foot. The customized pressure collection block is divided into the lateral front area of the heel, the lateral rear area of the heel, the medial front area of the heel, the medial rear area of the heel, the 1st metatarsal area, the 1st to 5th toe areas, the 2nd to 5th metatarsal areas and the midfoot area. It fits the shape of the sole of the foot and collects pressure values in different areas.

3. The plantar pressure acquisition device of the flexible force-sensitive sensor according to claim 1, characterized in that: The base is equipped with a fixing screw column, 4 base screw holes, a buckle, a fixing step, a switch hole, a TF card removal port, and a cable hole; the box cover is a rectangular plate structure, which is equipped with a fixing waist hole and 4 box cover screw holes. The base and the box cover are connected through the four base screw holes and the box cover screw holes; the Velcro passes through the fixed waist hole of the box cover to fix it to the calf.

4. The plantar pressure acquisition device of the flexible force-sensitive sensor according to claim 3, characterized in that: The PCB board also has an LED indicator light, board screw holes, a charging device, and a cable interface; the flexible force-sensitive insole sensor is electrically connected to the cable interface through a cable; the battery is fixed in the buckle of the base, and its cable is soldered to the PCB board; the PCB board is located above the battery and is fixed to the fixing screw column and the fixing step with screws through the board screw holes; the STM32F105 control chip, CD4051 chip, filter capacitor, data storage module, LED indicator light and charging device are soldered to the main board, and a TF card removal port is reserved on the side of the base of the control box; the push-button power switch is fixed to the switch hole on the side of the control box by means of buckles and glue, and its connecting cable is soldered to the PCB board.

5. The plantar pressure acquisition device of the flexible force-sensitive sensor according to claim 3, characterized in that: The filter capacitor is electrically connected to the flexible force-sensitive insole sensor. The voltage signal generated by the flexible force-sensitive sensor is transmitted to the filter capacitor for filtering. The filter capacitor is electrically connected to the CD4051 chip and transmits the filtered signal to the CD4051 chip. The CD4051 chip is electrically connected to the STM32F105 control chip.

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