Intelligent disinfection device for elevator buttons

Abstract

The invention discloses an intelligent disinfection device for elevator buttons. Comprising a posture adjusting mechanism, a magnetic field positioning system, a feedback executing mechanism and the like, space optimization layout is achieved through cooperative work of a telescopic mechanical arm and a lifting platform, when a user presses an elevator button, a magnetic field generator arranged in the button triggers a positioning signal, and a Hall sensor guides the mechanical arm to be accurately positioned to a target button; the execution assembly sequentially completes the processes of atomization disinfection, roller wiping and hot air drying; in addition, the device adopts a thermomagnetic coupling effector to realize dual functions of positioning magnetic field generation and surface rapid drying, and is matched with an ultrasonic obstacle detection system and an emergency stop protection mechanism to ensure the operation safety; metal environment interference is overcome through the electromagnetic positioning technology, instant disinfection response after contact is achieved, compared with a traditional scheme, the beneficial effects of being high in positioning accuracy, zero in disinfection residue, low in space occupancy rate and the like are achieved, and the problems of elevator button cross infection risk and disinfectant secondary pollution are effectively solved.

Description

Technical Field

[0001] The invention relates to an intelligent disinfection device for elevator buttons. Background Art

[0002] Current elevator button disinfection technologies mostly rely on timed ultraviolet irradiation or fixed spray devices, which exhibit disinfection lag and fail to accurately cover the touched buttons. Mobile disinfection equipment based on infrared or image recognition is susceptible to interference from the elevator's metal environment, leading to positioning deviations. Furthermore, fixed structures permanently occupy the space around the elevator operating panel, impacting the user experience. Existing solutions, such as full-coverage ultraviolet solutions, carry the risk of false triggering, and traditional liquid spraying can easily cause liquid accumulation on the buttons, which in turn becomes a carrier for microbial growth and causes secondary contamination. To address the risk of contact pathogen transmission in public elevators, there is an urgent need to develop a disinfection device that can respond in real time, accurately locate, and be space-friendly. This device can immediately complete targeted disinfection after a passenger presses a button, while avoiding issues such as disinfectant residue and equipment space encroachment. Summary of the Invention

[0003] Purpose of the invention: The purpose of the present invention is to provide an intelligent disinfection device for elevator buttons that integrates real-time response triggering, electromagnetic positioning, dynamic space optimization and zero-residue disinfection.

[0004] Technical solution: The intelligent disinfection device for elevator buttons described in the present invention includes an elevator operating platform, a telescopic mechanical arm is installed on the elevator operating platform, and an execution component for spraying disinfectant is movably installed at the other end of the telescopic mechanical arm; a microprocessor for controlling the telescopic mechanical arm and the execution component is also installed on the elevator operating platform.

[0005] Furthermore, the actuator includes a housing, inside which a first motor, a transmission turbine and a conical transmission gear are installed; the first motor and the transmission turbine are connected through a worm, the transmission turbine is engaged with the conical transmission gear, and the conical transmission gear is fixed with a wiping cylinder after passing through the housing.

[0006] Furthermore, a Hall sensor, a second motor and a fan are installed inside the box, and the second motor is fixedly connected to the Hall sensor and the fan.

[0007] Furthermore, a humidity sensor and an atomizing nozzle are fixedly connected to the outside of the box, and the other side of the atomizing nozzle is connected to the disinfectant storage bin installed on the telescopic robotic arm through a soft tube.

[0008] Furthermore, the telescopic robotic arm includes a disc base, a fixed trapezoidal bracket, a large trough bracket assembly, a medium trough bracket assembly, a movable trapezoidal support, a radial screw connecting the medium trough bracket assembly and the movable trapezoidal support, a small semi-split trough bracket assembly, a trough bracket, and a C-shaped bracket connected to the actuator assembly;

[0009] The fourth steering gear, the third steering gear, the second steering gear, the first steering gear and corresponding flanges are installed at each connection.

[0010] Furthermore, ultrasonic sensor receivers are installed on both sides of the large trough-shaped bracket assembly, the movable trapezoidal support and the small half-divided trough-shaped bracket assembly.

[0011] Furthermore, a connecting plate is installed on the disc base, and a speaker and a disinfectant storage bin are installed on the connecting plate; a fifth servo is also installed on the other side of the disc base.

[0012] Furthermore, the microprocessor includes a multi-channel signal processing module, a motion control module and a thermal magnetic coupling control module; the multi-channel signal processing module is electrically connected to the trigger circuit of the ultrasonic sensing receiver, the Hall sensor and the humidity sensor; the motion control module is connected to the first servo, the second servo, the third servo, the fourth servo, the fifth servo, the first motor and the second motor.

[0013] Furthermore, elevator buttons, a thermal magnetic coupling effector and a lifting platform are installed on the elevator operating platform;

[0014] The elevator button and the thermomagnetic coupling effector are mounted on both sides of the elevator operating platform correspondingly; the thermomagnetic coupling effector includes a heating resistor and a magnetic field generator. The heating resistor is wound in an annular groove on the back of the elevator button. The axis of the magnetic field generator passes vertically through the elevator button and is fixed to the inner coil of the heating resistor using a thermally conductive insulating adhesive.

[0015] The multi-channel signal processing module is electrically connected to the trigger circuit of the elevator button;

[0016] The thermal-magnetic coupling control module is electrically connected to the heating resistor and the magnetic field generator.

[0017] Furthermore, the lifting platform includes two sets of guide rails, a feed platform is installed between the two sets of guide rails, a limit switch and a worm gear passing through the feed platform are fixed inside the two sets of guide rails, and a stepper motor is also fixed on the outside of the two sets of guide rails.

[0018] The working principle of the present invention is as follows: first, the user presses the elevator button; then, the pressed elevator button generates an electrical signal, and the magnetic field generator on the inside generates a positioning magnetic field; at this time, the lifting platform rises, the telescopic robotic arm unfolds, the Hall sensor senses the magnetic field for identification and positioning, and drives the telescopic robotic arm to make the actuator close to the pressed elevator button; then, the atomizing nozzle sprays disinfectant, and the humidity sensor monitors in real time. After the spraying is completed, the heating resistor and the wiping cylinder work simultaneously, and then the fan works to achieve rapid drying of the button; during operation, if the ultrasonic sensor receiver detects an obstacle within 20 cm around the telescopic robotic arm, the device stops suddenly and issues a warning sound through the speaker.

[0019] The beneficial effects of the present invention are as follows: 1. The present invention realizes precise positioning and real-time disinfection of the disinfection site through the coordinated action of the posture adjustment mechanism, the magnetic field positioning system and the actuator; 2. The present invention adopts a lifting structure, which enables the device to be retracted inside the elevator operating platform when in standby mode, avoiding permanent occupation of the space around the elevator operating panel. At the same time, during operation, the device automatically detects whether there are obstacles in the surrounding area and takes effective feedback measures, greatly reducing the impact on users' daily use of the elevator; 3. The actuator of the present invention includes an atomizing nozzle, a fan, a humidity sensor and a wiping cylinder. The data changes of the humidity sensor and a reasonable control algorithm can effectively control the spraying amount of the disinfectant. At the same time, through the coordinated action of the fan, the wiping cylinder and thermistor, the effect of rapid cleaning and avoiding disinfectant residue is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the telescopic mechanical arm in the present invention;

[0022] Figure 3 It is a front view of the execution component of the present invention;

[0023] Figure 4 It is a rear view of the execution component of the present invention;

[0024] Figure 5 Schematic diagram of the thermal magnetic coupling effector structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the structural connection of the lifting platform installed on the elevator operating platform of the present invention;

[0026] In the figure: 1 is the elevator operating platform;

[0027] 2 is a telescopic robotic arm, 201 is a large trough bracket assembly, 202 is a medium trough bracket assembly, 203 is a radial screw, 204 is a movable trapezoidal support, 205 is a small semi-split trough bracket assembly, 206 is the first servo, 207 is a trough bracket, 208 is a C-shaped bracket, 209 is a flange, 210 is an ultrasonic sensor receiver, 211 is the second servo, 212 is the third servo, 213 is a fixed trapezoidal bracket, 214 is a disc base, 215 is the fourth servo, 216 is a speaker, 217 is a disinfectant storage bin, and 218 is the fifth servo.

[0028] 3 is the actuator, 301 is the housing, 302 is the first motor, 303 is the worm, 304 is the transmission turbine, 305 is the atomizing nozzle, 306 is the Hall sensor, 307 is the second motor, 308 is the fan, 309 is the conical transmission gear, 310 is the humidity sensor, and 311 is the wiping cylinder;

[0029] 4 is the elevator button;

[0030] 5 is a thermomagnetic coupling effector, 501 is a heating resistor, and 502 is a magnetic field generator;

[0031] 6 is the lifting platform, 601 is the limit switch, 602 is the guide rail, 603 is the feed platform, 604 is the worm, and 605 is the stepping motor;

[0032] 7 is a microprocessor. DETAILED DESCRIPTION

[0033] The specific technical solutions of the present invention are further described in detail below with reference to specific examples.

[0034] As shown in the figure, the elevator button intelligent disinfection device described in the present invention includes a posture adjustment mechanism, a magnetic field positioning system and a feedback actuator;

[0035] The posture adjustment mechanism includes a telescopic mechanical arm 2, a lifting platform 6, and a microprocessor 7;

[0036] The lifting platform 6 and the microprocessor 7 are installed inside the elevator operating platform 1;

[0037] The telescopic mechanical arm 2 is initially retracted inside the elevator operating platform 1;

[0038] The magnetic field positioning system includes a magnetic field generator 502 and a Hall sensor 306;

[0039] The feedback actuator includes an actuator component 3 and a thermal magnetic coupling effector 5;

[0040] Wherein, the execution component 3 is fixed to the end of the telescopic mechanical arm 2 by screws;

[0041] The thermomagnetic coupling effector 5 is installed on the inner side of the elevator button 4;

[0042] In the present invention, the device is powered by access to the elevator power line to achieve its normal operation; the posture adjustment mechanism, magnetic field positioning system and feedback actuator cooperate with each other to achieve the positioning and real-time disinfection of the designated button, greatly improving the timeliness and accuracy of disinfection;

[0043] Among them, by adopting the lifting platform 6, the device can be retracted into the interior of the elevator operating platform 1 when in the standby state, avoiding permanent occupation of the space around the elevator operating panel and achieving space friendliness.

[0044] like Figure 2 As shown, the telescopic robotic arm 2 includes a large trough-shaped bracket assembly 201, a medium-sized trough-shaped bracket assembly 202, a radial screw 203, a movable trapezoidal support 204, a small half-divided trough-shaped bracket assembly 205, two first servos 206, a trough-shaped bracket 207, a C-shaped bracket 208, a flange 209, an ultrasonic sensor receiver 210, a second servo 211, a third servo 212, a fixed trapezoidal bracket 213, a disc base 214, a fourth servo 215, a speaker 216, a disinfectant storage bin 217, and a fifth servo 218.

[0045] The disc base 214 is fixed on the upper side of the lifting platform 6 by screws;

[0046] A fourth servo 215 is mounted on the fixed trapezoidal bracket 213 , and the fixed trapezoidal bracket 213 is fixed to the disc base 214 by screws;

[0047] One end of the large trough-shaped support assembly 201 is fixed to the fixed trapezoidal support 213 by screws, and the large trough-shaped support assembly 201 can perform a sector-shaped scanning motion through the fourth servo 215;

[0048] One end of the medium-sized trough-shaped support assembly 202 and the third servo 212 are fixed to the other end of the large-sized trough-shaped support assembly 201 by screws, and the medium-sized trough-shaped support assembly 202 can perform a sector-shaped scanning motion through the third servo 212;

[0049] The medium-sized trough-shaped support assembly 202 is fixedly connected to the movable trapezoidal support 204 via a radial screw 203; the second servo 211 passes through the movable trapezoidal support 204 and is fixed to one end of the small half-split trough-shaped support assembly 205, so that the small half-split trough-shaped support assembly 205 can rotate via the second servo 211;

[0050] One end of the slot-shaped bracket 207 and the first servo 206 are fixed to the other end of the small half-split slot-shaped bracket assembly 205 by screws, and the slot-shaped bracket 207 can perform a sector-shaped scanning motion through the first servo 206;

[0051] The other end of the groove-shaped bracket 207 is fixedly connected to the first steering gear 206 and the C-shaped bracket 208;

[0052] The flange 209 is installed at each connection of the telescopic robot arm 2;

[0053] Ultrasonic sensor receivers 210 are evenly installed on both sides of the large trough-shaped support assembly 201, the movable trapezoidal support 204 and the small half-divided trough-shaped support assembly 205;

[0054] The fifth steering gear 218 passes through the elevator operating platform 1 and is fixedly connected to the lifting platform 6 by screws, and the disc base 214 rotates through the fifth steering gear 218.

[0055] In the present invention, the telescopic robotic arm 2 uses a large trough-shaped bracket assembly 201, a medium-sized trough-shaped bracket assembly 202 and a small half-trough-shaped bracket assembly 205 as main extension components to ensure that the range of motion of the robotic arm covers all buttons in the elevator; servos with different postures are connected in the middle of each bracket assembly to ensure that the robotic arm can move smoothly within a fixed plane; however, due to different actual working scenarios, obstacles such as people and objects may appear within the range of motion of the robotic arm; at this time, when the obstacle is too close (less than 20 cm), the ultrasonic sensor receivers 210 evenly installed on both sides of the bracket assembly will sense the signal and immediately feed the signal back to each servo; the servo then immediately stops and issues a warning tone through the speaker 216 until the ultrasonic sensor receiver 210 senses that the obstacle is far away and the servo continues to rotate to the designated position.

[0056] like Figure 3-4 As shown, the actuator 3 includes a housing 301, a first motor 302, a worm 303, a transmission turbine 304, an atomizing nozzle 305, a Hall sensor 306, a second motor 307, a fan 308, a conical transmission gear 309, a humidity sensor 310 and a wiping cylinder 311;

[0057] Wherein, the first motor 302 and the transmission turbine 304 are connected to each other via a worm 303;

[0058] The conical transmission gear 309 passes through the box 301 and is fixedly connected to the wiping cylinder 311;

[0059] The conical transmission gear 309 is meshed with the transmission turbine 304 , and the wiping cylinder 311 can be rolled by the first motor 302 ;

[0060] One side of the atomizing nozzle 305 is fixed to the outside of the box 301, and the other side is connected to the disinfectant storage bin 217 through a soft capillary tube;

[0061] The second motor 307 is fixedly connected to the fan 308, and the fan 308 can rotate through the second motor 307;

[0062] The humidity sensor 310 is fixedly installed on the outside of the box 301;

[0063] In the present invention, the actuator 3 is mainly responsible for performing positioning and disinfection. When the elevator button 4 is pressed, the Hall sensor 306 is activated, begins to detect the magnetic field, and transmits the signal to the posture adjustment system to achieve precise positioning. After positioning is completed, the nozzle face rotates to face the elevator button face, and the atomizing nozzle 305 is activated to spray a certain amount of disinfectant. The humidity sensor 310 monitors in real time.

[0064] Then, the wiping surface rotates to face the elevator button surface, and the first motor 302 drives the wiping cylinder 311 to rotate, and a new paper towel rotates into the window, performing multiple wiping actions back and forth;

[0065] Finally, the fan face rotates to face the elevator button face, and the second motor 307 drives the fan 308 to rotate to promote the evaporation of the residual disinfectant. At this point, the work of the execution component 3 is completed.

[0066] like Figure 5 As shown, the thermomagnetic coupling effector 5 includes a heating resistor 501 and a magnetic field generator 502. The heating resistor 501 is evenly wound in the form of a spiral coil in the annular groove on the back of the elevator button 4. Its winding path forms a concentric circle array with the magnetic field generator 502 as the center. The magnetic field generator 502 is composed of a permanent magnet core and a powered coil. The axis of the magnetic field generator 502 passes perpendicularly through the surface of the elevator button 4. The outer surface of the permanent magnet core and the inner coil of the heating resistor 501 are bonded and fixed by thermally conductive insulating adhesive.

[0067] In the present invention, the functions of the thermomagnetic coupling effector 5 include two points: first, when the elevator button 4 is pressed, a magnetic field is emitted through the magnetic field generator 502 so that the Hall sensor 306 can be accurately positioned; second, heat is generated through the heating resistor 501 to slowly increase the surface temperature of the button so that the disinfectant can evaporate quickly.

[0068] like Figure 6 As shown, the lifting platform 6 includes a limit switch 601, a guide rail 602, a feeding platform 603, a worm 604 and a stepping motor 605;

[0069] The stepper motor 605 is fixed on the outer side of the guide rail 602 by screws.

[0070] A limit switch 601 is installed on the guide rail 602;

[0071] Grooves are provided on both sides of the feeding platform 603, and the worm 604 is fixedly connected to the feeding platform 603 through the grooves, and the feeding platform 603 can be moved by the worm 604;

[0072] In the present invention, the main function of the lifting platform 6 is to retract and push out the entire main structure of the device; when there is no user using the elevator and the elevator is crowded or after the device has completed its operation, the lifting platform 6 retracts the main structure of the device;

[0073] When a user uses the elevator and there is ample space in the elevator, the lifting platform 6 pushes out the main structure of the device and the device starts to perform its tasks; this design greatly reduces space occupation, reduces power consumption of the device, and optimizes the entire workflow.

[0074] The microprocessor 7 includes a multi-channel signal processing module, a motion control module, and a thermal magnetic coupling control module, wherein: the multi-channel signal processing module is electrically connected to the Hall sensor 306, the humidity sensor 310, the ultrasonic sensor receiver 210, and the trigger circuit of the elevator button 4, receives magnetic field positioning signals, surface humidity data, obstacle distance signals, and button pressing electrical signals in real time, and eliminates interference from the elevator metal structure on the magnetic field signals through an adaptive filtering algorithm; the motion control module is drivingly connected to the stepper motor 605 of the lifting platform 6, the servos 206, 211, 212, 215, 218 of the telescopic robotic arm 2, and the first motor 302 and second motor 307 of the actuator 3, generates motion commands based on the output data of the multi-channel signal processing module, and controls the lifting height of the lifting platform 6, the deployment angle of the robotic arm 2, and the rolling speed of the wiping cylinder 311;

[0075] The thermomagnetic coupling control module is electrically connected to the heating resistor 501 and the magnetic field generator 502 of the thermomagnetic coupling effector 5, outputs a pulse current to the magnetic field generator 502 during the button pressing stage to enhance the positioning magnetic field strength, and switches to outputting a step-by-step heating current to the heating resistor 501 after disinfection is completed, while dynamically adjusting the heating power according to the residual liquid film thickness feedback from the humidity sensor 310.

[0076] When using the present invention, the user first presses the elevator button 4; then, the pressed elevator button 4 generates an electrical signal, and the internal magnetic field generator 502 generates a positioning magnetic field; at this time, the lifting platform 6 rises, the telescopic robotic arm 2 unfolds, and the Hall sensor 306 senses the magnetic field for identification and positioning, and drives the telescopic robotic arm 2 to bring the actuator 3 close to the pressed elevator button 4; then, the atomizing nozzle 305 sprays disinfectant, and the humidity sensor 310 performs real-time monitoring. After the spraying is completed, the heating resistor 501 and the wiping cylinder 311 work simultaneously, and then the fan 308 works to achieve rapid drying of the button; during operation, if the ultrasonic sensor receiver 210 detects an obstacle within 20 cm around the telescopic robotic arm 2, the device stops suddenly and emits a warning tone through the speaker 216. Through this series of steps, the intelligent disinfection device for elevator buttons can efficiently complete the disinfection work.

[0077] In summary, the present invention realizes precise positioning and real-time disinfection of the disinfection site through the synergistic effect of the posture adjustment mechanism, the magnetic field positioning system and the actuator; at the same time, by adopting a lifting structure, the device can be retracted into the interior of the elevator operating platform 1 when in standby state, avoiding permanent occupation of the space around the elevator operating panel. During the operation of the device, it automatically detects whether there are obstacles in the surrounding area and takes effective feedback measures, greatly reducing the impact on the user's daily use of the elevator; in addition, the reasonable design of the actuator 3 can effectively control the spray amount of the disinfectant, and through the synergistic effect of the fan 308, the wiping cylinder 311 and the thermistor (heating resistor 501), the effect of rapid cleaning and avoiding disinfectant residue is achieved.

Claims

1. An intelligent disinfection device for elevator buttons, comprising an elevator operating platform (1), characterized in that: A telescopic mechanical arm (2) is installed on the elevator operating platform (1), and an actuator (3) for spraying disinfectant is movably installed at the other end of the telescopic mechanical arm (2); a microprocessor (7) for controlling the telescopic mechanical arm (2) and the actuator (3) is also installed on the elevator operating platform (1).

2. The intelligent disinfection device for elevator buttons according to claim 1, characterized in that: The actuator assembly (3) comprises a housing (301), wherein a first motor (302), a transmission turbine (304) and a conical transmission gear (309) are installed inside the housing (301); the first motor (302) and the transmission turbine (304) are connected via a worm (303), the transmission turbine (304) is meshed with the conical transmission gear (309), and the conical transmission gear (309) passes through the housing (301) and is fixedly connected to a wiping cylinder (311).

3. The intelligent disinfection device for elevator buttons according to claim 2, characterized in that: A Hall sensor (306), a second motor (307) and a fan (308) are also installed inside the box (301), and the second motor (307) is fixedly connected to the Hall sensor (306) and the fan (308).

4. The intelligent disinfection device for elevator buttons according to claim 2, characterized in that: A humidity sensor (310) and an atomizing nozzle (305) are fixedly connected to the outside of the box (301), and the other side of the atomizing nozzle (305) is connected to the disinfectant storage bin (217) installed on the telescopic mechanical arm (2) through a soft tube.

5. The intelligent disinfection device for elevator buttons according to claim 1, characterized in that: The telescopic mechanical arm (2) comprises a disc base (214) movably connected to each other, a fixed trapezoidal bracket (213), a large trough-shaped bracket assembly (201), a medium-sized trough-shaped bracket assembly (202), a movable trapezoidal support (204), a radial screw rod (203) connecting the medium-sized trough-shaped bracket assembly (202) and the movable trapezoidal support (204), a small half-divided trough-shaped bracket assembly (205), a trough-shaped bracket (207), and a C-shaped bracket (208) connected to the actuator assembly (3); A fourth steering gear (215), a third steering gear (212), a second steering gear (211), a first steering gear (206) and corresponding flanges (209) are installed at each connection.

6. The intelligent disinfection device for elevator buttons according to claim 5, characterized in that: Ultrasonic sensor receivers (210) are installed on both sides of the large trough-shaped support assembly (201), the movable trapezoidal support (204) and the small half-divided trough-shaped support assembly (205).

7. The intelligent disinfection device for elevator buttons according to claim 5, characterized in that: A connecting plate is also installed on the disc base (214), and a speaker (216) and a disinfectant storage bin (217) are installed on the connecting plate; a fifth steering gear (218) is also installed on the other side of the disc base (214).

8. The intelligent disinfection device for elevator buttons according to claim 4 or 7, characterized in that: The microprocessor (7) includes a multi-channel signal processing module, a motion control module and a thermal magnetic coupling control module; the multi-channel signal processing module is electrically connected to the trigger circuit of the ultrasonic sensor receiver (210), the Hall sensor (306) and the humidity sensor (310); the motion control module is drivingly connected to the first steering gear (206), the second steering gear (211), the third steering gear (212), the fourth steering gear (215), the fifth steering gear (218), the first motor (302) and the second motor (307).

9. The intelligent disinfection device for elevator buttons according to claim 7, characterized in that: An elevator button (4), a thermomagnetic coupling effector (5) and a lifting platform (6) are also installed on the elevator operating platform (1); The elevator button (4) and the thermomagnetic coupling effector (5) are mounted on both sides of the elevator operating platform (1) correspondingly; the thermomagnetic coupling effector (5) comprises a heating resistor (501) and a magnetic field generator (502); the heating resistor (501) is wound in an annular groove on the back of the elevator button (4); the axis of the magnetic field generator (502) passes vertically through the elevator button (4) and is fixed to the inner coil of the heating resistor (501) by means of a heat-conducting insulating adhesive; The multi-channel signal processing module is electrically connected to the trigger circuit of the elevator button (4); The thermal-magnetic coupling control module is electrically connected to the heating resistor (501) and the magnetic field generator (502).

10. The intelligent disinfection device for elevator buttons according to claim 9, characterized in that: The lifting platform (6) includes two sets of guide rails (602), a feeding platform (603) is installed between the two sets of guide rails (602), a limit switch (601) and a worm (604) passing through the feeding platform (603) are fixed inside the two sets of guide rails (602), and a stepping motor (605) is also fixed outside the two sets of guide rails (602).

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