Pedal switch convenient to disassemble and assemble and control method thereof

Abstract

The invention relates to the technical field of foot switches, in particular to a foot switch convenient to disassemble and assemble and a control method thereof, and the method comprises the steps: obtaining an initial acting force applied to the surface of a pedal based on a device connected with the foot switch in a normal response period; determining whether the rigidity of the push rod spring is reduced or not according to the fluctuation coefficient of actual acting force applied to the upper part of the pedal surface; determining a rigidity adjusting coefficient according to the rigidity attenuation coefficient of the push rod spring; determining whether the adjustment of the rigidity of the push rod spring is qualified or not according to the springback duration of the push rod spring springback to the initial position when the acting force on the surface of the pedal is withdrawn, and determining the springback index of the push rod spring under the condition that the adjustment is unqualified; optimization of the adjustment coefficient is determined according to the difference value between the springback index of the push rod spring and a preset springback index; and the pedal switch is controlled based on the fact that the push rod spring is optimized to reach the preset springback index. According to the invention, the problem of poor sensitivity caused by rigidity attenuation of the pedal switch spring is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foot switches, in particular to a foot switch convenient to disassemble and assemble and a control method thereof. BACKGROUND

[0002] As an important human-computer interaction device, foot switches are widely used in industrial machinery control, medical equipment start-stop, stage light adjustment and other occasions that require hands-free operation. The core working principle of the foot switch usually depends on a spring return mechanism. When the user steps on the pedal, the internal trigger mechanism is actuated by overcoming the spring force, and after release, it is reset by the spring. However, the foot switches in the prior art generally face a long-term and difficult-to-avoid key problem: the spring stiffness decays with the extension of the use time, resulting in a significant decrease in switch sensitivity and reduced reliability.

[0003] As a key reset and operation feedback element, the spring inevitably experiences material fatigue and performance degradation in repeated compression / stretching cycles. This degradation mainly manifests as a decrease in spring stiffness. Stiffness decay has serious negative effects on foot switch performance, including trigger force drift and sensitivity decline, poor reset and response delay, and weak tactile feedback.

[0004] Chinese Patent Publication No. CN115863090B discloses a foot switch, which includes a base for connecting to a host computer, a main control part provided on the base for outputting control electrical signals to the host computer, the main control part including a pedal, a stroke detection mechanism, and a resistance feedback mechanism. The back of the pedal is pivotally connected to the base through a rotating shaft, one end of the rotating shaft is fixedly connected to a swing rod, and the two ends of the swing rod are respectively drivingly connected to the stroke detection mechanism and the resistance feedback mechanism. The first end of the main control part is symmetrically provided with a first side control part and a second side control part, which are the same in structure. The first side control part and the second side control part can be triggered to generate control electrical signals by vertical pressing or deflection relative to the outer side of the main control part. The invention can directly generate seven different control electrical signals through the feet to meet various control requirements, and has multiple triggering modes to meet different usage habits.

[0005] Therefore, the foot switch has the problems of stiffness decay of the reset mechanism, reduced sensitivity of the foot switch, weak tactile feedback to the user, and complex disassembly and replacement after long-term use. SUMMARY

[0006] To this end, the application provides a pedal switch convenient to disassemble and assemble and a control method thereof, so as to overcome the problem that the sensitivity of the reset mechanism of the pedal switch in the prior art is reduced and the tactile feedback to the user is weakened and the disassembly and replacement are complicated after long-time use.

[0007] To achieve the above object, the application provides a control method of a pedal switch convenient to disassemble and assemble. The method comprises the following steps: obtaining an initial force applied to the pedal surface based on a device connected to the pedal switch under a normal response period; determining whether the stiffness of the push rod spring decreases according to the fluctuation coefficient of the actual force applied to the upper part of the pedal surface in the history; under the condition that the stiffness of the push rod spring decreases, adjusting the stiffness of the push rod spring according to an adjustment coefficient that reduces the effective number of turns of the push rod spring to 1 / 1.5 or 1 / 2.67 of the original effective number of turns of the push rod spring according to the stiffness attenuation coefficient of the push rod spring; determining whether the adjustment of the stiffness of the push rod spring is qualified according to the rebound time length of the push rod spring rebounding to the initial position when the force applied to the pedal surface is removed, and determining the rebound index of the push rod spring in the unqualified case; determining to execute the reduction adjustment coefficient to optimize the adjustment coefficient according to the absolute difference between the rebound index of the push rod spring and the preset rebound index; controlling the pedal switch based on the optimization of the push rod spring to reach the preset rebound index.

[0008] Further, the process of determining whether the stiffness of the push rod spring decreases according to the fluctuation coefficient of the actual force applied to the upper part of the pedal surface in the history comprises, obtaining the force applied to the pedal surface in the history; calculating the standard deviation and the average value of the force; calculating the ratio of the standard deviation to the average value to obtain the fluctuation coefficient; comparing the fluctuation coefficient with a preset fluctuation coefficient; determining that the stiffness of the push rod spring decreases based on the fluctuation coefficient being greater than the preset fluctuation coefficient.

[0009] Further, the process of determining the adjustment coefficient of the stiffness of the push rod spring according to the stiffness attenuation coefficient of the push rod spring comprises, respectively obtaining the stiffness of the push rod spring before and after use; determining the stiffness attenuation coefficient based on the stiffness after use and the stiffness before use; comparing the stiffness attenuation coefficient with a preset stiffness attenuation coefficient; determining, based on the stiffness attenuation coefficient being less than or equal to a preset stiffness attenuation coefficient, a first adjustment coefficient for adjusting the stiffness of the push rod spring; The first adjustment coefficient is determined based on a ratio of a first stiffness attenuation coefficient under the condition that the stiffness attenuation coefficient is less than the preset stiffness attenuation coefficient to the preset stiffness attenuation coefficient.

[0010] Further, the process of determining the adjustment coefficient for the stiffness of the push rod spring according to the stiffness attenuation coefficient of the push rod spring further comprises, determining, based on the stiffness attenuation coefficient being greater than the preset stiffness attenuation coefficient, a second adjustment coefficient for adjusting the stiffness of the push rod spring; The second adjustment coefficient is determined based on a ratio of a second stiffness attenuation coefficient under the condition that the stiffness attenuation coefficient is greater than the preset stiffness attenuation coefficient to the preset stiffness attenuation coefficient.

[0011] Further, the process of determining whether the adjustment of the stiffness of the push rod spring is qualified according to the rebound duration of the push rod spring rebounding to the initial position when the force on the pedal surface is removed, and determining the rebound index of the push rod spring in the unqualified case comprises, obtaining the pulse width of the starting time to the ending time of the push rod spring rebounding to the initial position; calculating the rebound duration from the starting time to the ending time; comparing the rebound duration with a preset rebound duration; determining that the adjustment of the stiffness of the push rod spring is unqualified based on the rebound duration being less than or greater than the preset rebound duration, and determining the rebound index.

[0012] Further, the process of determining whether the adjustment of the stiffness of the push rod spring is qualified according to the rebound duration of the push rod spring rebounding to the initial position when the force on the pedal surface is removed, and determining the first rebound index of the push rod spring in the unqualified case comprises, The first rebound index is the rebound index in the case that the stiffness change amount of the adjusted stiffness of the push rod spring is too large, and is obtained by calculating the product of the ratio of the adjusted stiffness to the initial stiffness and the ratio of the preset rebound duration to the adjusted rebound duration.

[0013] Further, after adjusting the stiffness of the push rod spring, the process of determining whether the adjustment of the stiffness of the push rod spring is qualified according to the rebound duration of the push rod spring rebounding to the initial position when the force on the pedal surface is removed, and determining the second rebound index of the push rod spring in the unqualified case comprises, The second rebound index is the rebound index in the case that the stiffness change amount of the adjusted stiffness of the push rod spring is insufficient, and is obtained by calculating the product of the ratio of the adjusted stiffness to the initial stiffness and the ratio of the preset rebound duration to the adjusted rebound duration.

[0014] Further, the process of determining the optimization of the adjustment coefficient according to the absolute difference between the rebound index of the push rod spring and the preset rebound index comprises, comparing the first rebound index and the second rebound index with the preset rebound index; calculating a first absolute difference between the first rebound index and the preset rebound index; calculating a second absolute difference between the second rebound index and the preset rebound index; determining a first optimization strategy for the adjustment coefficient based on the first absolute difference; wherein the first optimization strategy is to reduce the stiffness of the push rod spring after adjustment of the first adjustment coefficient and / or the second adjustment coefficient.

[0015] Further, the process of determining the optimization of the adjustment coefficient according to the absolute difference between the rebound index of the push rod spring and the preset rebound index comprises, determining a second optimization strategy for the adjustment coefficient based on the second absolute difference; wherein the second optimization strategy is to increase the stiffness of the push rod spring after adjustment of the first adjustment coefficient and / or the second adjustment coefficient.

[0016] The application also provides a pedal switch convenient to disassemble and assemble, comprising: a pedal body comprising a base, a pedal cover arranged on the upper part of the base for stepping, a plurality of mounting holes fixedly arranged on the upper end side thereof, and a lock head assembly movably arranged on the end portion thereof; a push rod assembly comprising a movable torsion spring movably arranged on one side of the base, an active shaft penetratingly arranged in the movable torsion spring, a movable block fixedly arranged on the other side of the movable torsion spring, a push rod fixedly arranged on the end portion of the movable block, a fixed seat fixedly arranged on the lower part of the push rod, a push rod spring movably arranged around the fixed seat, a slide and a plurality of circular through holes fixed ring fixedly arranged on the upper end surface of the fixed seat, a pre-tightening block movably arranged on the slide, and a clamping spring fixedly arranged on one side of the pre-tightening block; a micro-motion assembly comprising a pair of micro-motion switches fixedly arranged on both sides of the push rod assembly; a reset assembly comprising a plurality of springs fixedly arranged in the base; a data acquisition module comprising a photoelectric sensor fixedly arranged on the upper part of the push rod spring and a pressure sensor arranged on the bottom of the pedal, for acquiring the initial force applied to the surface of the pedal based on the device connected to the pedal switch under the normal response period; a data analysis module for determining whether the stiffness of the push rod spring decreases according to the fluctuation coefficient of the actual force applied to the upper part of the pedal surface in the history; An adjusting module is configured to determine an adjusting coefficient of the stiffness of the push rod spring according to the stiffness attenuation coefficient of the push rod spring; A regulation detecting module is configured to determine whether the adjustment of the stiffness of the push rod spring is qualified according to the rebound time of the push rod spring rebounding to the initial position when the force on the pedal surface is removed, and determine the rebound index of the push rod spring if the adjustment is not qualified. An optimizing module is configured to determine the optimization of the adjusting coefficient according to the difference between the rebound index of the push rod spring and the preset rebound index.

[0017] Compared with the prior art, the beneficial effects of the present application are that the structure design of the foot switch provides great convenience for disassembly and replacement of the foot switch by arranging a plurality of rectangular holes on the back of the base, so that users or maintenance personnel can easily disassemble through the rectangular holes without the need for complex tools or cumbersome steps, greatly reducing maintenance and replacement costs and improving the maintainability of the equipment. The design of the movable torsional spring and the push rod spring in the push rod assembly enables the pedal to quickly respond and trigger the micro switch when subjected to the stepping force, generating a control signal to achieve rapid start of the equipment, ensuring the sensitivity of triggering, and ensuring that the pedal can quickly reset and limit the downward distance after being released through the design of the reset assembly and the limiting assembly, further improving the use experience and reliability of the foot switch.

[0018] Further, real-time monitoring of the force on the pedal surface by the data acquisition module and analysis of the fluctuation coefficient of the force by the data analysis module can accurately determine whether the stiffness of the push rod spring decreases in time, and when the stiffness decreases, the adjusting module can quickly adjust the stiffness of the push rod spring to ensure that the force on the pedal surface can be quickly and accurately transmitted to the micro switch within the equipment response period, thereby generating a control signal in time, effectively improving the response sensitivity of the foot switch, avoiding response delay caused by the decrease in spring stiffness, and ensuring that the equipment can be quickly started or stopped.

[0019] Further, by comparing the stiffness attenuation coefficient with the preset stiffness attenuation coefficient, the degree of stiffness attenuation of the push rod spring can be accurately determined, and the appropriate adjusting coefficient can be selected to adjust the spring stiffness, and the determination of the adjusting coefficient based on the ratio of the stiffness attenuation coefficient to the preset stiffness attenuation coefficient can accurately adjust the effective number of turns of the push rod spring according to different situations, accurately adjust the stiffness of the push rod spring, effectively avoid the situation that the performance of the foot switch is affected due to the decrease in stiffness of the push rod spring caused by long-term use, and keep the push rod spring in an optimal stiffness state during use, thereby prolonging the service life of the spring and reducing equipment maintenance costs and replacement frequency.

[0020] Further, by adjusting the detection module according to the pedal surface force, the rebound time of the push rod spring is determined, whether the adjustment of the push rod spring stiffness is qualified, and the rebound index is determined under the unqualified condition. The adjustment coefficient is further optimized by the optimization module according to the difference between the rebound index and the preset rebound index, so that the stiffness adjustment of the push rod spring can reach the standard of the preset rebound index after adjustment, and a closed-loop detection-adjustment-optimization control mechanism is formed. The adjustment mechanism and the optimization mechanism can effectively avoid the problem of unstable performance of the foot switch caused by improper adjustment of the spring stiffness, improve the overall reliability of the foot switch, reduce the equipment failure rate, and further improve the performance and stability of the foot switch.

[0021] Further, through accurate adjustment and optimization of the stiffness of the push rod spring, the foot switch can always maintain good performance during use, and the rapid start and stop of the equipment and the lightness and consistency of the foot operation can be significantly improved, providing users with a smoother, more stable and reliable use experience, reducing the inconvenience and safety hazards caused by equipment response delay or operation insensitivity. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Step diagram of the control method of the foot switch convenient to disassemble of the embodiment of the application; Figure 2 Structure schematic diagram of the foot switch convenient to disassemble of the embodiment of the application; Figure 3 A part structure enlarged schematic diagram of the foot switch convenient to disassemble of the embodiment of the application; Figure 4 Back structure schematic diagram of the foot switch convenient to disassemble of the embodiment of the application; Figure 5 Area enlarged view of the irregular buckle of the foot switch convenient to disassemble of the embodiment of the application; Figure 6 Module connection block diagram of the foot switch convenient to disassemble of the embodiment of the application; Figure 7 Judgment diagram for determining whether the stiffness of the push rod spring decreases according to the fluctuation coefficient of the force of the embodiment of the application; Figure 8 Judgment diagram for determining the adjustment coefficient according to the stiffness attenuation coefficient of the embodiment of the application; Figure 9 Judgment diagram for determining whether the adjustment is qualified according to the rebound time of the push rod spring of the embodiment of the application; Figure 10 Flowchart for determining the optimization strategy according to the difference of the rebound index of the embodiment of the application; In the figure, 1-pedal, 2-base, 3-foot pad, 4-movable torsion spring, 5-movable shaft, 6-movable block, 7-push rod, 8-fixed seat, 9-push rod spring, 10-pre-tightening block, 11-circular through hole fixing ring, 12-clamp spring, 13-micro switch, 14-roller swing lever, 15-return spring, 16-side shaft, 17-side spring, 18 first mounting hole, 19-lock head, 20-hexagonal fixing ring, 21-irregular buckle, 22-limiting rod, 23-prism, 24-fixed rod, 25-L-shaped buckle, 26-mounting hole, 27-optoelectronic sensor, 28-rectangular hole. DETAILED DESCRIPTION

[0023] In order to make the objects and advantages of the present application clearer, the following further describes the present application with reference to examples; it should be understood that the specific examples described herein are merely used to explain the present application and do not limit the present application.

[0024] The preferred embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application.

[0025] It should be noted that, in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is merely for the convenience of description and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0026] In addition, it should also be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0027] Please refer to Figure 1 As shown in the figure, it is a step diagram of the control method of the foot switch convenient to disassemble according to the embodiment of the present application.

[0028] The control method of the foot switch convenient to disassemble according to the embodiment of the present application comprises: Obtaining the initial force applied to the surface of the pedal based on the device connected with the foot switch under the normal response period; According to the change amount of the actual force applied to the upper part of the pedal surface in history, a fluctuation coefficient of the actual force is calculated, and the fluctuation coefficient is compared with a preset waveform coefficient to determine whether the stiffness of the push rod spring decreases; Under the condition of determining the stiffness decrease of the spring, the adjustment coefficient of the stiffness of the push rod spring is determined according to the difference between the stiffness attenuation coefficient of the spring and a preset stiffness attenuation coefficient; After adjusting the stiffness of the push rod spring, whether the adjustment of the stiffness of the push rod spring is qualified is determined according to the rebound time of the push rod spring to the initial position when the force on the pedal surface is removed, and the rebound index of the push rod spring is determined in the unqualified case; Under the condition of determining that the adjustment of the stiffness of the push rod spring is unqualified, the optimization strategy of the adjustment coefficient is determined according to the difference between the rebound index of the push rod spring and a preset rebound index; Based on the optimization of the push rod spring reaching the preset rebound index, the control of the foot switch is completed.

[0029] Please continue to refer to Figures 2 to 6 as shown, Figure 2 A structure diagram of the foot switch convenient to disassemble according to the embodiment of the application; Figure 3 An enlarged structure diagram of part A of the foot switch convenient to disassemble according to the embodiment of the application; Figure 4 A back structure diagram of the foot switch convenient to disassemble according to the embodiment of the application; Figure 5 An enlarged view of the area of the irregular buckle of the foot switch convenient to disassemble according to the embodiment of the application; Figure 6 A module connection block diagram of the foot switch convenient to disassemble according to the embodiment of the application.

[0030] The foot switch convenient to disassemble according to the embodiment of the application comprises: A foot pedal main body comprising a base 2 and a pedal 1 arranged on the upper part of the base 2 for treading, a foot pad 3 fixedly arranged at the lower part of the base 2, a cavity arranged inside for mounting other components, a first mounting hole 18 fixedly arranged at the upper end face, and a pair of mounting holes 26 symmetrically arranged at the side face of the base; Specifically, a pair of rectangular holes 28 are fixedly arranged at the back of the base for facilitating disassembly and replacement of the foot switch.

[0031] A push rod assembly comprising a movable torsion spring 4 movably arranged at one side of the base 2, a movable shaft 5 arranged through the inside of the movable torsion spring 4, a movable block 6 fixedly arranged at the other side of the movable torsion spring 4, a push rod 7 fixedly arranged at the end of the movable block 6, a fixed seat 8 fixedly arranged at the lower part of the push rod 7, a push rod spring 9 movably arranged in a circumferential ring around the fixed seat 8, a pre-tightening block 10 and a plurality of circular through-hole fixing rings 11 fixedly arranged at the upper end face of the fixed seat 8; a clamping spring 12 is fixedly arranged at one side of the pre-tightening block 10; Micro-motion assembly, which includes a pair of micro-motion switches 13 fixedly arranged on both sides of the push rod assembly, and a pair of roller swing rods 14 movably arranged on one side of the micro-motion switches 13; Reset assembly, which includes a pair of reset springs 15 fixedly arranged on one side inside the base 2, a pair of side shafts 16 movably arranged inside the pair of mounting holes 26, and a pair of side springs 17 symmetrically arranged inside the pair of side shafts 16; Lock head assembly, which includes a lock head 19 movably arranged inside the first mounting hole 18, and a hexagonal fixing ring 20 movably arranged on one side end of the lock head 19 and extending into the base 2; Limiting assembly, which includes a pair of irregular buckles 21 fixedly arranged at the lower part of the base 2 to fix the movable torsion spring 4, a pair of limiting rods 22 arranged at the middle part of the base 2 to limit the downward displacement of the pedal 1, a pair of prisms 23 to fix the pair of micro-motion switches 13, a pair of fixed rods 24 fixedly arranged on the upper part of the push rod assembly, and a pair of L-shaped buckles 25 fixedly arranged on the upper part of the base 2 to fix the hexagonal fixing ring 20.

[0032] Data acquisition module, which includes a photoelectric sensor 27 fixedly arranged on the upper part of the pre-tightening block 10, and a pressure sensor (not shown in the figure) arranged at the bottom of the pedal 1, to obtain the initial force applied to the surface of the pedal based on the device connected with the foot switch under the normal response period; Data analysis module, which is connected with the data acquisition module, to determine whether the stiffness of the push rod spring 9 decreases according to the fluctuation coefficient of the actual force applied to the surface of the pedal 1 under the current response period of the device; Regulation module, which is connected with the data analysis module and the push rod assembly respectively, to determine the adjustment coefficient for adjusting the stiffness of the push rod spring 9 according to the attenuation coefficient of the stiffness of the push rod spring 9; Regulation detection module, which is connected with the regulation module, to determine whether the adjustment of the stiffness of the push rod spring 9 is qualified according to the rebound time of the push rod spring 9 to return to the initial position when the force on the surface of the pedal 1 is removed, and to determine the rebound index of the push rod spring 9 under unqualified conditions; Optimization module, which is connected with the regulation detection module and the push rod assembly respectively, to determine the optimization strategy for the adjustment coefficient according to the difference between the rebound index of the push rod spring 9 and the preset rebound index.

[0033] Specifically, when the pressure is applied on the upper surface of the pedal 1, the pedal 1 is displaced due to the force acting in the vertical direction of the force, the pedal 1 moves vertically downward, at this time, the movable shaft 5 in the push rod assembly arranged in the base 2 starts to move vertically downward under the action force from the pedal 1, wherein the movable torsion spring 4 is movably arranged on the movable shaft 5, the left side of the movable torsion spring 4 abuts against the side wall of the base 2, and the right side is embedded into one side of the movable block 6, therefore, during the downward movement of the movable shaft 5, the movable torsion spring 4 moves downward together with the movable shaft 5, at this time, the movable torsion spring 4 is elongated, and during the elongation of the movable torsion spring 4, the movable block 6 and the push rod 7 are pushed to move in the horizontal direction, the push rod spring 9 is compressed to deform, during the horizontal movement, the movable block 6 contacts the pair of roller swing rods 14 arranged on the sides of the pair of micro switches 13, the pair of roller swing rods 14 are displaced to trigger the pair of micro switches 13, and then the control signal for starting the equipment is generated, when the pressure applied on the surface of the pedal 1 is withdrawn, at this time, the movable torsion spring 4 which moves downward to deform under the action force and the push rod spring 9 which is compressed return to the initial state, forming elastic force, forcing the movable shaft 5, the movable block 6 and the push rod 7 to move to the initial position, the movable block 6 is disconnected from the pair of roller swing rods 14, the control signal is no longer generated, and the equipment is stopped.

[0034] Specifically, the structure design of the foot switch provides great convenience for disassembly and replacement of the foot switch by arranging a pair of rectangular holes 28 on the back of the base 2, the foot side shaft 16 adopts a self-resetting spring structure, facilitating installation and disassembly, and ordinary flathead screwdriver can be used to easily disassemble the pedal, so that the user or the maintenance personnel can easily disassemble through the rectangular holes without complex tools or cumbersome steps, greatly reducing the maintenance and replacement cost, improving the maintainability of the equipment, the design of the movable torsion spring 4 and the push rod spring 9 in the push rod assembly enables the pedal 1 to quickly respond and trigger the pair of micro switches 13 when subjected to the stepping force, generating the control signal, thereby realizing the quick start of the equipment, not only ensuring the sensitivity of triggering, but also ensuring that the pedal can quickly reset and limit the downward movement distance after being released, further improving the use experience and reliability of the foot switch.

[0035] Please continue to refer to Figure 7 Fig. 3 is a judgment diagram for determining whether the stiffness of the push rod spring decreases according to the fluctuation coefficient of the action force.

[0036] Specifically, when the device connected with the foot switch is in a normal response period, the pressure sensor arranged at the lower part of the pedal records the size of the force currently applied to the upper part of the pedal surface as an initial force, and records the actual force applied to the upper part of the pedal surface in real time in a subsequent use process under a current device response period, and calculates a fluctuation coefficient of the actual force according to the change amount of the actual force applied to the upper part of the pedal surface in a plurality of historical times, and compares the fluctuation coefficient with a preset fluctuation coefficient to determine whether the stiffness of the push rod spring decreases, wherein, If the fluctuation coefficient is less than or equal to the preset fluctuation coefficient, it is determined that the stiffness of the push rod spring does not decrease. If the fluctuation coefficient is greater than the preset fluctuation coefficient, it is determined that the stiffness of the push rod spring decreases. The preset fluctuation coefficient is the ratio of the standard deviation of the force to the average value of the force, and the value range is 0.06-0.08, and the preferred value of the present application is 0.07. The preferred value range and the preferred value of the preset fluctuation coefficient can be determined according to the actual situation, which is not limited here.

[0037] The fluctuation coefficient is the ratio of the standard deviation of the force applied to the pedal surface to the average value of the force, and 100 times of the force applied to the pedal surface is selected, the standard deviation of the 100 times of the force is calculated by using the standard deviation formula, the average value of the 100 times of the force is calculated, and finally the ratio of the standard deviation to the average value is calculated to obtain the fluctuation coefficient.

[0038] In the embodiment of the present application, the value of the preset fluctuation coefficient is 0.07, and in the implementation, when the value of the fluctuation difference is 0.09, it is consistent with the fluctuation difference being greater than the preset fluctuation coefficient, indicating that the force applied to the pedal surface changes greatly in the historical use process, and the force is uneven, at this time, it is determined that the stiffness of the movable torsional spring and the push rod spring decreases, and the stiffness of the push rod spring under the condition of uneven force is recorded.

[0039] Specifically, the data acquisition module is used to monitor the force on the pedal surface in real time, and the data analysis module is used to analyze the fluctuation coefficient of the force, so that the force on the pedal surface can be quickly and accurately transmitted to the microswitch within the device response period, thereby generating a control signal in time, effectively improving the response sensitivity of the foot switch, avoiding the response delay caused by the decrease of the spring stiffness, and ensuring that the device can be quickly started or stopped.

[0040] Please continue to refer to Figure 8 As shown in the figure, it is a judgment diagram for determining the adjustment coefficient according to the stiffness attenuation coefficient in the embodiment of the present application.

[0041] Specifically, in a condition that the stiffness of the movable torsion spring and the push rod spring is determined to be decreased, an adjustment coefficient of the stiffness of the push rod spring is determined according to a stiffness attenuation coefficient of the push rod spring and a preset stiffness attenuation coefficient, wherein, If the stiffness attenuation coefficient is less than or equal to the preset stiffness attenuation coefficient, it is determined that the stiffness of the push rod spring is adjusted by a first adjustment coefficient; If the stiffness attenuation coefficient is greater than the preset stiffness attenuation coefficient, it is determined that the stiffness of the push rod spring is adjusted by a second adjustment coefficient; The preset stiffness attenuation coefficient is 0.25-0.35, preferably 0.3, and the preferred value range and value of the preset stiffness attenuation coefficient can be determined according to actual conditions, which is not limited here.

[0042] The stiffness attenuation coefficient is obtained by subtracting the difference of the ratio of the stiffness of the push rod spring after use to the initial stiffness of the push rod spring before use from 1. In actual calculation, first, the deformation amount of the push rod spring under the action of force is obtained according to the photoelectric sensor arranged on the upper part of the push rod spring, and then the stiffness of the push rod spring after use and the stiffness before use are obtained according to the deformation formula of Hooke's law, and the difference of the ratio of the stiffness after use to the stiffness before use is calculated, thereby obtaining the stiffness attenuation coefficient.

[0043] In the embodiment of the application, the value of the preset stiffness attenuation coefficient is 0.3. In implementation, the regulation strategy of the deformation amount of the push rod spring is determined according to the stiffness attenuation coefficient of the movable torsion spring and the push rod spring and the preset stiffness attenuation coefficient. For example, in the case that the value of the stiffness attenuation coefficient is 0.15, the stiffness attenuation coefficient is less than the preset stiffness attenuation coefficient, which indicates that the stiffness attenuation amount of the push rod spring after use is very small compared with the stiffness before use, and therefore it is determined that the stiffness of the push rod spring is adjusted by a first adjustment coefficient. For example, in the case that the value of the stiffness attenuation coefficient is 0.5, the stiffness attenuation coefficient is greater than the preset stiffness attenuation coefficient, which indicates that the stiffness attenuation amount of the push rod spring after use is large compared with the stiffness before use, and therefore it is determined that the stiffness of the push rod spring is adjusted by a second adjustment coefficient.

[0044] The first adjustment coefficient is based on the ratio of the first stiffness attenuation coefficient to the preset stiffness attenuation coefficient under the condition that the stiffness attenuation coefficient is less than the preset stiffness attenuation coefficient, and the calculation method is 1 + (first stiffness attenuation coefficient / preset stiffness attenuation coefficient), that is, when the first stiffness attenuation coefficient is 0.15, the ratio of the first stiffness attenuation coefficient to the preset stiffness attenuation coefficient is 0.5, and the first adjustment coefficient is determined to be 1.5, that is, the new effective number of turns of the push rod spring is reduced to 1 / 1.5 of the original effective number of turns. At this time, the pre-tightening block 10 arranged on the upper end surface of the fixed seat 8 drives the push rod spring to rotate axially, reduces the original effective number of turns of the push rod spring to increase the stiffness of the push rod spring.

[0045] The second adjustment coefficient is based on the ratio of the second stiffness attenuation coefficient to the preset stiffness attenuation coefficient under the condition that the stiffness attenuation coefficient is greater than the preset stiffness attenuation coefficient, and the calculation method is 1 + (second stiffness attenuation coefficient / preset stiffness attenuation coefficient), that is, when the second stiffness attenuation coefficient is 0.5, the ratio of the second stiffness attenuation coefficient to the preset stiffness attenuation coefficient is 1.67, and the second adjustment coefficient is determined to be 2.67, that is, the new effective number of turns of the push rod spring is reduced to 1 / 2.67 of the original effective number of turns. At this time, the pre-tightening block 10 arranged on the upper end surface of the fixed seat 8 drives the push rod spring to rotate axially, reduces the original effective number of turns of the push rod spring to increase the stiffness of the push rod spring.

[0046] Specifically, by comparing the stiffness attenuation coefficient with the preset stiffness attenuation coefficient, the stiffness attenuation degree of the push rod spring can be accurately determined, the appropriate adjustment coefficient can be selected to adjust the spring stiffness, and the adjustment coefficient is determined based on the ratio of the stiffness attenuation coefficient to the preset stiffness attenuation coefficient. The effective number of turns of the push rod spring can be accurately adjusted according to different situations, the stiffness of the push rod spring can be accurately adjusted, the situation that the stiffness of the push rod spring is reduced due to long-term use and affects the performance of the foot switch can be effectively avoided, the push rod spring can always maintain in an optimal stiffness state during use, thereby prolonging the service life of the spring and reducing the equipment maintenance cost and replacement frequency.

[0047] Please continue to refer to Figure 9 As shown in the figure, it is a judgment diagram for determining whether the adjustment is qualified according to the rebound time of the push rod spring in the embodiment of the application.

[0048] Specifically, after adjusting the stiffness of the push rod spring, the adjustment detection module determines whether the adjustment of the stiffness of the push rod spring is qualified according to the comparison result of the rebound time of the push rod spring rebounding to the initial position when the force on the pedal surface is removed and the preset rebound time, and determines the rebound index of the push rod spring in the unqualified case, wherein, If the rebound time length is equal to the preset rebound time length, it is determined that the adjustment of the stiffness of the push rod spring is qualified; If the rebound time length is less than or greater than the preset rebound time length, it is determined that the adjustment of the stiffness of the push rod spring is unqualified, and the rebound index under this condition is determined. The preset rebound time length refers to the time required for the push rod spring to rebound to the initial position after being compressed by the acting force, and the value range is 5-7 ms, and the preferred value of the present application is 6 ms. The preferred value range and the preferred value of the preset rebound time length can be determined according to the actual situation, which is not limited here.

[0049] The rebound time length is obtained according to the pulse width output by the photoelectric sensor from the starting time when the push rod spring is released to the ending time when the push rod spring rebounds to the initial position.

[0050] In the embodiment of the present application, the preset rebound time length is 6 ms. In the implementation, whether the adjustment of the stiffness of the push rod spring is qualified is determined according to the comparison result of the rebound time length of the push rod spring rebounding to the initial position when the acting force on the pedal surface is removed and the preset rebound time length, and the rebound index of the push rod spring is determined in the unqualified case. Under the condition that the rebound time length is 4 ms, it is consistent with the rebound time length being less than the preset rebound time length, which indicates that the stiffness change of the push rod spring after adjustment is too large, the rebound time length is too short, and impact load is easily generated on other components, affecting the normal operation of other components. At this time, it is determined that the stiffness adjustment of the push rod spring is unqualified, and the first rebound index at this time is determined. Under the condition that the rebound time length is 8 ms, it is consistent with the rebound time length being greater than the preset rebound time length, which indicates that the stiffness change of the push rod spring after adjustment is small, and the rebound time length is long, so that the matching degree of the acting force removed from the pedal and the acting force applied to the pedal surface is not high. At this time, it is determined that the stiffness adjustment of the push rod spring is unqualified, and the second rebound index at this time is determined.

[0051] The first rebound index is the rebound index in the case that the stiffness of the push rod spring changes too much after adjustment. The product of the ratio of the adjusted stiffness to the initial stiffness and the ratio of the preset rebound time length to the adjusted rebound time length is calculated, that is, the adjusted stiffness is 60 N / cm, the initial stiffness is 50 N / cm, the adjusted rebound time length is 4 ms, and the preset rebound time length is 6 ms. The first rebound index is 1.8.

[0052] The second rebound index is the rebound index when the change of the stiffness of the push rod spring after adjustment is insufficient, and the product of the ratio of the adjusted stiffness to the initial stiffness and the ratio of the preset rebound time to the adjusted rebound time is calculated, that is, the adjusted stiffness is 55 N / cm, the initial stiffness is 50 N / cm, the adjusted rebound time is 8 ms, and the preset rebound time is 6 ms, and the second rebound index is 0.83.

[0053] The initial stiffness is the stiffness of the push rod spring when it is designed and installed, and is obtained by part parameters.

[0054] Please continue to refer to Figure 10 As shown in the figure, it is a flow chart of the embodiment of the application for determining the optimization strategy according to the difference of the rebound index.

[0055] Specifically, under the condition of determining the rebound index, the optimization strategy of the adjustment coefficient is determined according to the absolute difference between the rebound index of the push rod spring and the preset rebound index, wherein, Under the condition of the first rebound index, the first rebound index is greater than the preset rebound index, and the first absolute difference between the first rebound index and the preset rebound index is 0.8. Under the condition of the second rebound index, the second rebound index is less than the preset rebound index, and the second absolute difference between the second rebound index and the preset rebound index is 0.17. Preferably, the preset rebound index is 1, and the value of the preset rebound index can be determined according to actual conditions, which is not limited here.

[0056] In the embodiment of the application, the value of the preset rebound index is 1, and in the implementation, when the rebound index is under the condition of the first rebound index, it indicates that the change of the stiffness of the push rod spring after adjustment is too large, and the rebound time is too short, which is easy to generate impact load to other components and affect the normal operation of other components, and the first optimization strategy of the adjustment coefficient is determined, and when the rebound index is under the condition of the second rebound index, it indicates that the change of the stiffness of the push rod spring after adjustment is small, and the rebound time is long, so that the matching degree of the force when the force is removed from the pedal and the force applied to the surface of the pedal is not high, and the second optimization strategy of the adjustment coefficient is determined.

[0057] The first optimization strategy is to reduce the stiffness of the push rod spring after adjustment of the first adjustment coefficient and / or the second adjustment coefficient, that is, under the condition of the first adjustment coefficient, 1 plus the ratio of the first stiffness attenuation coefficient to the preset stiffness attenuation coefficient is reduced to 0.7 plus the ratio of the first stiffness attenuation coefficient to the preset stiffness attenuation coefficient as the optimization strategy for the first adjustment coefficient, and under the condition of the second adjustment coefficient, 1 plus the ratio of the second stiffness attenuation coefficient to the preset stiffness attenuation coefficient is reduced to 0.4 plus the ratio of the second stiffness attenuation coefficient to the preset stiffness attenuation coefficient as the optimization strategy for the second adjustment coefficient, so as to reduce the stiffness of the push rod spring after adjustment of the first adjustment coefficient and / or the second adjustment coefficient, and make the rebound index of the push rod spring reach the preset rebound index standard.

[0058] The second optimization strategy is to increase the stiffness of the push rod spring after adjustment of the first adjustment coefficient and / or the second adjustment coefficient, that is, under the condition of the first adjustment coefficient, 1 plus the ratio of the first stiffness attenuation coefficient to the preset stiffness attenuation coefficient is increased to 1.2 plus the ratio of the first stiffness attenuation coefficient to the preset stiffness attenuation coefficient as the optimization strategy for the first adjustment coefficient, and under the condition of the second adjustment coefficient, 1 plus the ratio of the second stiffness attenuation coefficient to the preset stiffness attenuation coefficient is increased to 1.6 plus the ratio of the second stiffness attenuation coefficient to the preset stiffness attenuation coefficient as the optimization strategy for the second adjustment coefficient, so as to increase the stiffness of the push rod spring after adjustment of the first adjustment coefficient and / or the second adjustment coefficient, and make the rebound index of the push rod spring reach the preset rebound index standard.

[0059] Specifically, the rebound duration of the push rod spring when the pedal surface acting force is removed is detected by the adjustment detection module to determine whether the adjustment of the stiffness of the push rod spring is qualified, and the rebound index is determined under the unqualified condition. The adjustment coefficient is further optimized by the optimization module according to the difference between the rebound index and the preset rebound index, so as to ensure that the stiffness of the push rod spring after adjustment can reach the preset rebound index standard, forming a closed-loop detection-adjustment-optimization control mechanism. The adjustment mechanism and the optimization mechanism can effectively avoid the problem of unstable performance of the foot switch caused by improper adjustment of the spring stiffness, improve the overall reliability of the foot switch, reduce the equipment failure rate, and further improve the performance and stability of the foot switch.

[0060] The technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after these changes or replacements will fall within the protection scope of the present application.

Claims

1. A control method for a foot switch that is easy to install and disassemble, characterized in that, include, Obtain the initial force applied to the pedal surface by the device connected to the foot switch during the normal response cycle; Determine whether the stiffness of the push rod spring has decreased based on the fluctuation coefficient of the actual force applied to the pedal surface over multiple historical periods; Under the condition that the stiffness of the push rod spring decreases, an adjustment coefficient is determined based on the stiffness attenuation coefficient of the push rod spring to adjust the effective number of turns of the push rod spring, so as to increase the stiffness of the push rod spring. The stiffness adjustment of the push rod spring is determined based on the rebound time of the push rod spring to the initial position when the force on the pedal surface is removed. If it is not qualified, the rebound index of the push rod spring is determined. The adjustment coefficient is determined based on the absolute difference between the spring return index and the preset spring return index, in order to optimize the adjustment coefficient. The foot switch is controlled by optimizing the push rod spring to achieve a preset rebound index.

2. The control method for the easily detachable foot switch according to claim 1, characterized in that, The process of determining whether the stiffness of the push rod spring has decreased based on the fluctuation coefficient of the actual force applied to the upper part of the pedal surface over multiple historical periods includes: Obtain the forces applied to the pedal surface in several historical instances; Calculate the standard deviation and average value of several forces applied; The fluctuation coefficient is obtained by calculating the ratio of the standard deviation to the mean. The fluctuation coefficient is compared with the preset fluctuation coefficient; Based on the fact that the fluctuation coefficient is greater than the preset fluctuation coefficient, it is determined that the stiffness of the push rod spring has decreased.

3. The control method for the easily detachable foot switch according to claim 2, characterized in that, The process of determining the adjustment coefficient for the stiffness of the push rod spring based on its stiffness attenuation coefficient includes the following steps: Obtain the stiffness of the push rod spring before and after use; The stiffness attenuation coefficient is determined based on the stiffness after use and the stiffness before use; The stiffness attenuation coefficient is compared with the preset stiffness attenuation coefficient; Based on the fact that the stiffness attenuation coefficient is less than or equal to the preset stiffness attenuation coefficient, the stiffness of the push rod spring is adjusted by the first adjustment coefficient. The first adjustment coefficient is determined based on the ratio of the first stiffness attenuation coefficient to the preset stiffness attenuation coefficient under the condition that the stiffness attenuation coefficient is less than the preset stiffness attenuation coefficient.

4. The control method for the easily detachable foot switch according to claim 3, characterized in that, The process of determining the adjustment coefficient for the stiffness of the push rod spring based on its stiffness attenuation coefficient also includes, Based on the fact that the stiffness attenuation coefficient is greater than the preset stiffness attenuation coefficient, the stiffness of the push rod spring is adjusted by the second adjustment coefficient. The second adjustment coefficient is determined based on the ratio of the second stiffness attenuation coefficient to the preset stiffness attenuation coefficient under the condition that the stiffness attenuation coefficient is greater than the preset stiffness attenuation coefficient.

5. The control method for the easily detachable foot switch according to claim 4, characterized in that, The process of determining whether the stiffness adjustment of the push rod spring is qualified based on the rebound time of the push rod spring to its initial position when the force on the pedal surface is removed, and determining the rebound index of the push rod spring if it is not qualified, includes the following steps: Obtain the pulse width at the start moment of the push rod spring release and the end moment of its rebound to the initial position; Calculate the rebound time from the start time to the end time; The rebound time is compared with the preset rebound time; The adjustment of the stiffness of the push rod spring is deemed unqualified based on whether the rebound time is less than or greater than the preset rebound time, and the rebound index is determined.

6. The control method for the easily detachable foot switch according to claim 5, characterized in that, The stiffness adjustment of the push rod spring is determined based on the rebound time of the push rod spring to the initial position when the force on the pedal surface is removed. If it is not qualified, the first rebound index of the push rod spring is determined. The first rebound index is the rebound index when the stiffness of the push rod spring changes too much after adjustment. It is obtained by calculating the product of the ratio of the adjusted stiffness to the initial stiffness and the ratio of the preset rebound time to the adjusted rebound time.

7. The control method for the easily detachable foot switch according to claim 6, characterized in that, After adjusting the stiffness of the push rod spring, the time it takes for the push rod spring to rebound to its initial position when the force on the pedal surface is removed is used to determine whether the adjustment of the stiffness of the push rod spring is qualified. If it is not qualified, the second rebound index of the push rod spring is determined. The second rebound index is the rebound index when the stiffness change of the push rod spring after adjustment is insufficient. It is obtained by calculating the product of the ratio of the adjusted stiffness to the initial stiffness and the ratio of the preset rebound time to the adjusted rebound time.

8. The control method for the easily detachable foot switch according to claim 7, characterized in that, The process of determining the optimization of the adjustment coefficient based on the absolute difference between the spring return index and the preset spring return index includes the following steps: Compare the first rebound index and the second rebound index with the preset rebound index; Calculate the first absolute difference between the first rebound index and the preset rebound index; Calculate the second absolute difference between the second rebound index and the preset rebound index; A first optimization strategy for the adjustment coefficient is determined based on the first absolute difference; The first optimization strategy is to reduce the first adjustment coefficient or the second adjustment coefficient that adjusts the stiffness of the push rod spring.

9. The control method for the easily detachable foot switch according to claim 8, characterized in that, The process of determining the optimization of the adjustment coefficient based on the absolute difference between the spring return index and the preset spring return index also includes, A second optimization strategy for the adjustment coefficient is determined based on the second absolute difference; The second optimization strategy is to increase the first adjustment coefficient or the second adjustment coefficient to adjust the stiffness of the push rod spring.

10. A foot switch that is easy to install and disassemble, employing the control method of the foot switch that is easy to install and disassemble as described in any one of claims 1-9, characterized in that, include: The foot pedal body includes a base and a pedal covered on the upper part of the base for stepping on, a number of mounting holes fixedly disposed on its upper side and a locking assembly movably disposed at its end. A push rod assembly includes a movable torsion spring movably disposed on one side of the base, a movable shaft passing through the interior of the movable torsion spring, a movable block fixedly disposed on the other side of the movable torsion spring, a push rod fixedly disposed at the end of the movable block, a fixed seat fixedly disposed at the lower part of the push rod and a push rod spring movably disposed around its periphery, a slide rail and several circular through-hole fixing rings fixedly disposed on the upper end face of the fixed seat, and a preload block movably disposed on the slide rail, and a retaining spring fixedly disposed on one side of the preload block; The micro-motion assembly includes a pair of micro switches fixedly disposed on both sides of the push rod assembly; The reset assembly includes several springs fixedly disposed inside the base; The data acquisition module includes a photoelectric sensor fixedly mounted on the upper part of the push rod spring and a pressure sensor mounted on the bottom of the pedal, for acquiring the initial force applied to the pedal surface by the device connected to the foot switch during the normal response cycle. The data analysis module is used to determine whether the stiffness of the push rod spring has decreased based on the fluctuation coefficient of the actual force applied to the upper part of the pedal surface over multiple historical periods. The adjustment module is used to determine the adjustment coefficient of the stiffness of the push rod spring based on the stiffness attenuation coefficient of the push rod spring. The control and detection module is used to determine whether the adjustment of the stiffness of the push rod spring is qualified based on the rebound time of the push rod spring to the initial position when the force on the pedal surface is removed, and to determine the rebound index of the push rod spring if it is not qualified. The optimization module is used to determine the optimization of the adjustment coefficient based on the difference between the spring return index of the push rod spring and the preset spring return index.

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