Red cloth curtain folding and unfolding device and folding and unfolding method thereof

Abstract

The invention discloses a red cloth curtain folding and unfolding device which comprises a base. The red cloth curtain withdrawing assembly is arranged on the base; the red cloth curtain releasing assembly is arranged on the base and comprises a first unfolding unit and a first sensing unit, and the first unfolding unit comprises a first support, a first releasing motor driving wheel, a first driven wheel and a first releasing motor; the first sensing unit comprises a second support, a first grating and a first photoelectric sensor, the red cloth curtain penetrates through a first discharging motor driving wheel and a first driven wheel, and a first discharging motor is in linkage with the first discharging motor driving wheel and drives the first grating to rotate synchronously. The invention further discloses a folding and unfolding method of the red cloth curtain folding and unfolding device. According to the red cloth curtain folding and unfolding device and the folding and unfolding method thereof, unfolding and folding of the red cloth curtain can be controlled and measured; the structure is simple, cost is easy to control, and repair and maintenance are convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical tools, and in particular to a red cloth curtain retracting and releasing device and a retracting and releasing method thereof. Background Art

[0002] The high-voltage substation equipment cabinet has a high-voltage environment during operation. If accidentally touched, it may cause serious accidents. In order to ensure the normal operation of the power supply equipment and the personal safety of the operation and maintenance personnel, it is often necessary to unfold the red curtain when the equipment cabinet is in operation to remind that the equipment is in operation.

[0003] When the existing red curtains are actually retracted and extended, it is often the case that the unfolding heights of the red curtains of multiple equipment cabinets cannot be effectively controlled after being unfolded, resulting in an uneven situation. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a red cloth curtain retracting and releasing device and a retracting and releasing method thereof, which can control and measure the unfolding and recovery of the red cloth curtain; the structure is simple, the cost is easy to control, and it is convenient for repair and maintenance.

[0005] In order to solve the above technical problems, the present invention provides a red cloth curtain retracting and releasing device, comprising: a base; a red cloth curtain retracting assembly mounted on the base; a red cloth curtain releasing assembly mounted on the base, the red cloth curtain releasing assembly comprising a first unfolding unit and a first sensing unit, the first unfolding unit comprising: a first bracket mounted on the base, a first releasing motor driving wheel, a first driven wheel, and a first releasing motor; the first sensing unit comprising: a second bracket, a first grating and a first photoelectric sensor, wherein: the first releasing motor driving wheel is rotatably mounted on one side of the first bracket, the first releasing motor is mounted on the other side opposite to the first bracket, and the first releasing motor is connected to one side of the first releasing motor driving wheel. end, and the other end opposite to the first discharging motor driving wheel is connected to the first grating; the opposite ends of the first driven wheel are rotatably connected between the first bracket and the second bracket, the first driven wheel and the first discharging motor driving wheel are arranged adjacent to each other, the first photoelectric sensor is installed on the second bracket, and the first grating and the second bracket are arranged opposite to each other, wherein: the red cloth curtain passes through the first discharging motor driving wheel and the first driven wheel, the first discharging motor is linked to the first discharging motor driving wheel and drives the first grating to rotate synchronously, and the first photoelectric sensor obtains the photoelectric sensing signal of the number of rotations and the rotation angle of the first discharging motor driving wheel according to the rotation status of the first grating, so as to measure the recovery length of the red cloth curtain.

[0006] Among them, the surfaces of the first discharge motor driving wheel and the first driven wheel are respectively provided with concave-convex silicone layers for pressing the end edge of the red cloth curtain.

[0007] Among them, the red cloth curtain retracting assembly includes: a roller bracket, a conductive slip ring installed on one side of the roller bracket, a recovery motor installed on the other side of the roller bracket, and a red cloth curtain roller installed between the conductive slip ring and the recovery motor, wherein: the recovery motor links the red cloth curtain roller to rotate, so that the red cloth curtain is wound around the red cloth curtain roller and is retracted.

[0008] Among them, the recovery motor retracts the red cloth curtain, driving the first release motor driving wheel and the first driven wheel to rotate, and the power control line of the recovery motor is connected to the conductive slip ring.

[0009] Among them, the first releasing motor is linked to the first releasing motor driving wheel to rotate and unfold the red cloth curtain, and the recovery motor rotates accordingly.

[0010] Among them, the red cloth curtain retracting assembly also includes: a shaft bolt, and the motor shaft of the recovery motor is fastened to the roller bracket through the shaft bolt.

[0011] The red curtain releasing assembly includes a second unfolding unit and a second sensing unit. The second unfolding unit includes: a third bracket mounted on a base, a second releasing motor driving wheel, a second driven wheel, and a second releasing motor; the second sensing unit includes: a fourth bracket, a second grating, and a second photoelectric sensor; The structure of the second unfolding unit is symmetrical to that of the first unfolding unit, and the structure of the second sensing unit is symmetrical to that of the first sensing unit.

[0012] In order to solve the above technical problems, the present invention also discloses a method for collecting and releasing the above-mentioned red cloth curtain collecting and releasing device, comprising the following steps: the first releasing motor links the first releasing motor driving wheel to rotate and unfold the red cloth curtain, and the recovery motor follows the rotation; the detection signal of the first photoelectric sensor is obtained, and the electrical sensor signal is converted into data on the number of rotations and the rotation angle of the driving wheel of the first releasing motor; the releasing length data of the red cloth curtain is obtained according to the data on the number of rotations and the rotation angle of the driving wheel of the first releasing motor and the radius size data of the driving wheel of the first releasing motor; the first releasing motor is braked according to the obtained releasing length data of the red cloth curtain.

[0013] Among them, the following steps are also included: the recovery motor is linked to the red curtain roller to rotate, so that the red curtain is wrapped around the red curtain roller and is recovered; the first release motor driving wheel and the first driven wheel are passively rotated, and are linked to and drive the first grating to rotate synchronously; according to the rotation data of the first grating, the recovery length data of the red curtain is obtained; according to the obtained recovery length data of the red curtain, the recovery motor is braked.

[0014] The method also includes the steps of calibrating and marking the length of the red curtain.

[0015] The implementation of the red cloth curtain retracting and releasing device and the retracting and releasing method of the present invention has the following beneficial effects: the red cloth curtain retracting and releasing device comprises: a base; a red cloth curtain retracting assembly mounted on the base; a red cloth curtain releasing assembly mounted on the base, the red cloth curtain releasing assembly comprises a first unfolding unit and a first sensing unit, the first unfolding unit comprises: a first bracket mounted on the base, a first releasing motor driving wheel, a first driven wheel, and a first releasing motor; the first sensing unit comprises: a second bracket, a first grating and a first photoelectric sensor, the red cloth curtain passes through the first releasing motor driving wheel and the first driven wheel, the first releasing motor links the first releasing motor driving wheel and drives the first grating to rotate synchronously, the first photoelectric sensor obtains the photoelectric sensing signal of the number of rotations and the rotation angle of the first releasing motor driving wheel according to the rotation status of the first grating, which is used to measure the recovered length of the red cloth curtain, and can control and measure the unfolding and recovery of the red cloth curtain; the structure is simple, the cost is easy to control, and it is convenient for repair and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the red cloth curtain taking and releasing device according to an embodiment of the present invention.

[0018] Figure 2 The present invention is a flowchart of a method for collecting and releasing a red cloth curtain in a collecting and releasing device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1 The figure shows the first embodiment of the red cloth curtain retracting and releasing device of the present invention.

[0021] The red cloth curtain retracting and releasing device in this embodiment includes: a base 20; a red cloth curtain retracting assembly mounted on the base 20; a red cloth curtain releasing assembly mounted on the base 20, the red cloth curtain releasing assembly includes a first unfolding unit and a first sensing unit, the first unfolding unit includes: a first bracket 10 mounted on the base 20, a first releasing motor driving wheel 5, a first driven wheel 9, and a first releasing motor 11; the first sensing unit includes: a second bracket 8, a first grating 6 and a first photoelectric sensor 7.

[0022] The first discharging motor driving wheel 5 is rotatably mounted on one side of the first bracket 10, the first discharging motor 11 is mounted on the other side opposite to the first bracket 10, the first discharging motor 11 is connected to one end of the first discharging motor driving wheel 5, and the other end opposite to the first discharging motor driving wheel 5 is connected to the first grating 6; the opposite ends of the first driven wheel 9 are rotatably connected between the first bracket 10 and the second bracket 8 respectively, the first driven wheel 9 is arranged adjacent to the first discharging motor driving wheel 5, the first photoelectric sensor 7 is mounted on the second bracket 8, and the first grating 6 and the second bracket 8 are arranged opposite to each other.

[0023] During implementation, the first discharge motor driving wheel 5 is installed on the shaft of the first discharge motor 11. The first discharge motor 11 is installed on the base 20 through a bracket. The first driven wheel 9 is installed on the base 20 through a bracket. The surface of the first discharge motor driving wheel 5 and the first driven wheel 9 is a concave-convex silicone material layer, and the installation positions of the two wheel bodies are close. When the red cloth curtain passes through, the two end edges of the red cloth curtain can be tightly pressed. The first optical filter 6 is installed on the shaft of the first discharge motor 11, and its rotation angle and angular velocity are the same as those of the first discharge motor driving wheel 5 and the first driven wheel 9. The first photoelectric sensor 7 is fixed to the base 20 through a bracket.

[0024] Furthermore, in this embodiment, the red cloth curtain retracting assembly includes: a roller bracket 1, a conductive slip ring 21 installed on one side of the roller bracket 1, a recovery motor 3 installed on the other side of the roller bracket 1, and a red cloth curtain roller 4 installed between the conductive slip ring 21 and the recovery motor 3.

[0025] Among them, the recovery motor 3 retracts the red cloth curtain, driving the first release motor driving wheel 5 and the first driven wheel 9 to rotate, and the power control line of the recovery motor 3 is connected to the conductive slip ring 21.

[0026] During implementation, the motor housing of the recycling motor 3 is fixed to the red cloth curtain roller 4, the motor shaft of the recycling motor 3 is fixed to the roller bracket 1 through the shaft bolt 2, the conductive slip ring 21 is fixed to the other end of the red cloth curtain roller 4, the power control line of the recycling motor 3 is connected to the conductive slip ring 21, and the output line of the conductive slip ring 21 is connected to the control circuit board.

[0027] Among them, the first discharging motor 11 is linked to the first discharging motor driving wheel 5 to rotate and unfold the red cloth curtain, and the recovery motor 3 rotates accordingly.

[0028] Among them, the red cloth curtain retracting assembly also includes: a shaft bolt 2, and the motor shaft of the recovery motor 3 is fastened to the roller bracket 1 through the shaft bolt 2.

[0029] The purpose of setting up the red cloth curtain retracting component and the red cloth curtain releasing component is to separate the control device for releasing the red cloth curtain from the control device for recovering the red cloth curtain, so that the distance and releasing position of the red cloth curtain can be accurately controlled and measured during the releasing and recovering process.

[0030] Furthermore, the red cloth curtain releasing assembly also includes a second unfolding unit and a second sensing unit. The second unfolding unit includes: a third bracket 14 mounted on a base 20, a second releasing motor driving wheel 13, a second driven wheel 15, and a second releasing motor 12; the second sensing unit includes: a fourth bracket 16, a second grating 18 and a second photoelectric sensor 17; the structure of the second unfolding unit is symmetrical to that of the first unfolding unit, and the structure of the second sensing unit is symmetrical to that of the first sensing unit.

[0031] Furthermore, the second discharge motor driving wheel 13 is installed on the shaft of the second discharge motor 12. The second discharge motor 12 is fastened to the base 20 through a bracket, and the second driven wheel 15 is installed on the base 20 through a bracket. The surfaces of the second discharge motor driving wheel 13 and the second driven wheel 15 are concave-convex silicone materials, and the installation positions of the two wheel bodies are close. When the red curtain passes through, the two end edges of the red curtain can be tightly pressed. The second optical filter 18 is installed on the shaft of the second discharge motor 12, and its rotation angle and angular velocity are the same as those of the second discharge motor driving wheel 13 and the second driven wheel 15. The second photoelectric sensor 17 is fixed to the base 20 through a bracket.

[0032] In the specific implementation of the red cloth curtain retracting and releasing device in this embodiment, the red cloth curtain passes through the first release motor driving wheel 5 and the first driven wheel 9, the first release motor 11 links the first release motor driving wheel 5 and drives the first grating 6 to rotate synchronously, and the first photoelectric sensor 7 obtains the photoelectric sensor signal of the number of rotations and the rotation angle of the first release motor driving wheel 5 according to the rotation status of the first grating 6, so as to measure the recovery length of the red cloth curtain. The recovery motor 3 links the red cloth curtain roller 4 to rotate, so that the red cloth curtain is wound around the red cloth curtain roller 4 and is recovered.

[0033] like Figure 2 The figure shows the first embodiment of the method for collecting and releasing the red cloth curtain in the present invention.

[0034] The method for retracting and releasing the red cloth curtain retracting and releasing device in this embodiment comprises the following steps: Step S10, the first discharging motor 11 links with the first discharging motor driving wheel 5 to rotate and unfold the red curtain, and the recovery motor 3 rotates accordingly; Step S20, obtaining the detection signal of the first photoelectric sensor 7, and converting the electrical sensor signal into data of the number of rotations and the rotation angle of the first discharge motor driving wheel 5; Step S30, obtaining the data of the length of the red curtain to be released according to the data of the number of revolutions and the rotation angle of the first release motor driving wheel 5 and the radius size of the first release motor driving wheel 5; Step S40, braking the first releasing motor 11 according to the acquired releasing length data of the red curtain.

[0035] Furthermore, the red cloth curtain releasing assembly also includes a second unfolding unit and a second sensing unit. The second unfolding unit includes: a third bracket 14 mounted on a base 20, a second releasing motor driving wheel 13, a second driven wheel 15, and a second releasing motor 12; the second sensing unit includes: a fourth bracket 16, a second grating 18 and a second photoelectric sensor 17; the structure of the second unfolding unit is symmetrical to that of the first unfolding unit, and the structure of the second sensing unit is symmetrical to that of the first sensing unit.

[0036] In specific implementation, the release action of the red curtain is completed by the power provided by the first release motor 11 and the second release motor 12. At this time, the recovery motor 3 is in an idle state and the recovery motor 3 can rotate freely. After receiving the red curtain deployment instruction, the circuit board controller starts the red curtain deployment operation.

[0037] The first discharge motor 11 and the second discharge motor 12 are controlled to rotate respectively. At the same time, the first photoelectric sensor 7 and the second photoelectric sensor 17 of the detection photoelectric sensor start to detect the signal. Through formula conversion, the photoelectric sensor signal is converted into the data of the number of revolutions and the rotation angle of the first discharge motor driving wheel 5.

[0038] According to the known radii of the first pay-out motor driving wheel 5 and the second pay-out motor driving wheel 13, the unfolded length of the red cloth curtain is calculated.

[0039] When the length of the red curtain released is close to the preset value, the first release motor 11 and the second release motor 12 are controlled to reduce the rotation speed to accurately measure the length. In this way, the length of the red curtain released is controlled within a 2mm error range.

[0040] The method for collecting and releasing the red curtain in this embodiment further comprises the following steps: the recovery motor 3 is linked with the red curtain roller 4 to rotate, so that the red curtain is wound around the red curtain roller 4 and is collected; the first release motor driving wheel 5 and the first driven wheel 9 are passively rotated, and are linked with and drive the first grating 6 to rotate synchronously; According to the rotation data of the first grating 6, the retracted length data of the red cloth curtain is obtained; according to the obtained retracted length data of the red cloth curtain, the retracting motor 3 is braked.

[0041] In specific implementation, the retrieval of the red curtain is completed by the power provided by the recovery motor 3. At this time, the first discharge motor 11 and the second discharge motor 12 are in an idle state, and the first discharge motor 11 and the second discharge motor 12 can rotate freely. After the circuit board controller receives the red curtain retrieval instruction, it starts the red curtain retrieval operation.

[0042] The recovery motor 3 is controlled to rotate so that the red curtain is wound around the red curtain roller 4, thereby retracting the red curtain. At the same time, the first release motor driving wheel 5 and the first driven wheel 9 and the second release motor driving wheel 13 and the second driven wheel 19 clamp the red curtain with the two end edges of the red curtain respectively. While the recovery motor 3 retracts the red curtain, the first release motor driving wheel 5 and the first driven wheel 9 and the second release motor driving wheel 13 and the second driven wheel 19 rotate. At the same time, the linkage drives the first grating 6 and the second grating 18 to rotate synchronously.

[0043] The circuit board controller detects the signals of the first photoelectric sensor 7 and the second photoelectric sensor 17, and converts the photoelectric sensor signals into the number of rotations and the rotation angles of the first release motor driving wheel 5 and the second release motor driving wheel 13 through formula conversion. According to the known radii of the first release motor driving wheel 5 and the second release motor driving wheel 13, the retracted length of the red cloth curtain is calculated.

[0044] When the red curtain is close to the preset value of retraction, the retraction motor 3 is controlled to reduce the speed. In this way, the retraction of the red curtain is controlled within the error range of 2mm by accurately measuring the length.

[0045] The method for collecting and releasing the red curtain in this embodiment further comprises the following steps: calibrating and marking the length of the red curtain. The purpose of calibrating and marking the length of the red curtain is to make the system work more stable and run more reliably after adding the automatic calibration function.

[0046] During implementation, since the red curtain is a soft fabric, it may be deformed after being released and recovered many times. And if the red curtain is unfolded for a long time, it will also be stretched due to the effect of gravity. Therefore, it is necessary to calibrate and calibrate the length of the red curtain regularly. The specific implementation steps are as follows: The red curtain has been released and retracted more than 5 times. In increments of 5, auto calibration is initiated every time the number exceeds 5. The red curtain has been extended for more than 72 hours. The next time the red curtain is retracted, the length of the red curtain is calibrated immediately.

[0047] The automatic calibration method is as follows: when the red curtain is being recovered, after reaching the preset recovery length of the red curtain, the red curtain is continued to be recovered with a weak rotation force. When the recovery motor 3 is triggered to stall, the main control motor can monitor the power supply fluctuation of the recovery motor. At this time, the rotation of the recovery motor 3 is immediately stopped, and the angle of the recovery motor 3 is reversed by 2° to release the tension of the red curtain.

[0048] The main control circuit board records the recovery distance sampled by the current first photoelectric sensor 7 and the second photoelectric sensor 17. The real length of the current red curtain is calculated through a preset algorithm and updated and recorded in the system memory.

[0049] A red cloth curtain retracting and releasing device and a retracting and releasing method thereof implementing the present invention have the following beneficial effects: the red cloth curtain retracting and releasing device comprises: a base; a red cloth curtain retracting assembly mounted on the base; a red cloth curtain releasing assembly mounted on the base, the red cloth curtain releasing assembly comprises a first unfolding unit and a first sensing unit, the first unfolding unit comprises: a first bracket mounted on the base, a first releasing motor driving wheel, a first driven wheel, and a first releasing motor; the first sensing unit comprises: a second bracket, a first grating and a first photoelectric sensor, the red cloth curtain passes through the first releasing motor driving wheel and the first driven wheel, the first releasing motor links the first releasing motor driving wheel and drives the first grating to rotate synchronously, the first photoelectric sensor obtains the photoelectric sensing signal of the number of rotations and the rotation angle of the first releasing motor driving wheel according to the rotation status of the first grating, which is used to measure the recovered length of the red cloth curtain, and can control and measure the unfolding and recovery of the red cloth curtain; the structure is simple, the cost is easy to control, and it is convenient for repair and maintenance.

Claims

1. A red cloth curtain retracting and releasing device, characterized in that: include: Pedestal; A red cloth curtain retracting assembly mounted on the base; A red cloth curtain releasing assembly mounted on the base, the red cloth curtain releasing assembly comprises a first unfolding unit and a first sensing unit, the first unfolding unit comprises: a first bracket mounted on the base, a first releasing motor driving wheel, a first driven wheel, and a first releasing motor; the first sensing unit comprises: a second bracket, a first grating and a first photoelectric sensor, wherein: The first discharge motor driving wheel is rotatably mounted on one side of the first bracket, the first discharge motor is mounted on the other side opposite to the first bracket, the first discharge motor is connected to one end of the first discharge motor driving wheel, and the other end opposite to the first discharge motor driving wheel is connected to the first grating; The opposite ends of the first driven wheel are rotatably connected between the first bracket and the second bracket, the first driven wheel is arranged adjacent to the first discharge motor driving wheel, the first photoelectric sensor is mounted on the second bracket, and the first grating is arranged opposite to the second bracket, wherein: The red cloth curtain passes through the first release motor driving wheel and the first driven wheel, the first release motor is linked to the first release motor driving wheel and drives the first grating to rotate synchronously, and the first photoelectric sensor obtains the photoelectric sensor signal of the number of rotations and the rotation angle of the first release motor driving wheel according to the rotation status of the first grating, so as to measure the recovered length of the red cloth curtain.

2. The red cloth curtain retracting and releasing device according to claim 1, characterized in that: The surfaces of the first discharging motor driving wheel and the first driven wheel are respectively provided with concave-convex silicone layers for pressing the end edge of the red cloth curtain.

3. The red cloth curtain retracting and releasing device according to claim 1, characterized in that: The red cloth curtain retracting assembly comprises: a roller bracket, a conductive slip ring installed on one side of the roller bracket, a recovery motor installed on the other side of the roller bracket, and a red cloth curtain roller installed between the conductive slip ring and the recovery motor, wherein: The recovery motor is linked to the red cloth curtain roller to rotate, so that the red cloth curtain is wound around the red cloth curtain roller and is recovered.

4. The red cloth curtain retracting and releasing device according to claim 3, characterized in that: The recovery motor retracts the red cloth curtain, driving the first release motor driving wheel and the first driven wheel to rotate, and the power control line of the recovery motor is connected to the conductive slip ring.

5. The red cloth curtain retracting and releasing device according to claim 3, characterized in that: The first discharging motor is linked to the first discharging motor driving wheel to rotate and unfold the red cloth curtain, and the recovery motor rotates accordingly.

6. The red cloth curtain retracting and releasing device according to claim 3, characterized in that: The red cloth curtain retracting assembly also includes: a shaft bolt, and the motor shaft of the recovery motor is fastened to the roller bracket through the shaft bolt.

7. The red cloth curtain retracting and releasing device according to claim 1, characterized in that: The red curtain release assembly includes a second unfolding unit and a second sensing unit, wherein the second unfolding unit includes: a third bracket mounted on the base, a second release motor driving wheel, a second driven wheel, and a second release motor; the second sensing unit includes: a fourth bracket, a second grating, and a second photoelectric sensor; The structure of the second unfolding unit is symmetrical to that of the first unfolding unit, and the structure of the second sensing unit is symmetrical to that of the first sensing unit.

8. A method for collecting and releasing the red cloth curtain collecting and releasing device according to any one of claims 1 to 7, characterized in that: The following steps are involved: The first discharging motor is linked to the first discharging motor driving wheel to rotate and unfold the red cloth curtain, and the recovery motor rotates accordingly; Acquire the detection signal of the first photoelectric sensor, and convert the electrical sensor signal into data of the number of rotations and the rotation angle of the driving wheel of the first discharge motor; According to the data of the number of revolutions and the rotation angle of the driving wheel of the first releasing motor and the radius size data of the driving wheel of the first releasing motor, the releasing length data of the red cloth curtain is obtained; The first releasing motor is braked according to the acquired data of the releasing length of the red curtain.

9. The method for retracting and releasing according to claim 8, characterized in that: The following steps are also included: The recovery motor is linked to the red curtain roller to rotate, so that the red curtain is wound around the red curtain roller and recovered; The first discharge motor driving wheel and the first driven wheel rotate passively, and are linked to drive the first grating to rotate synchronously; According to the rotation data of the first grating, the retracted length data of the red curtain is obtained; The recovery motor is braked according to the acquired data of the retracted length of the red curtain.

10. The method for retracting and releasing according to claim 8, characterized in that: Also includes: Steps to calibrate and demarcate the length of the red curtain.

Images