A safety protection system and use method of a Venlo greenhouse roof cleaning machine

Abstract

The invention relates to a safety protection system for a Venlo-type greenhouse roof cleaning machine and a use method thereof, which is used for detecting the line-changing position, skylight opening, greenhouse top boundary and number of turns of a wire wheel and a water pipe of the greenhouse roof cleaning machine during operation, so as to actively avoid collision with the machine and the occurrence of a machine fall while ensuring normal operation; the safety protection system detects the working and position status of the cleaning machine in real time through travel switches and proximity switches; the travel switches include travel switches on the outer sides of two front wheels to prevent the cleaning machine from moving too far to the left and right, travel switches on two rear wheels to prevent the cleaning machine from moving too far backward when returning to a base frame, and travel switches on a motor protection device to ensure one-way line-changing of the cleaning machine; the proximity switches include proximity switches on the front and rear four wheels for judging the retraction and extension of guide rails, proximity switches on the main suspension for judging the opening and closing of the skylight, and proximity switches on the support frame for judging the number of turns of the wire wheel and the water pipe wheel.

Description

Technical Field

[0001] The present invention relates to the technical field of Venlo greenhouse roof cleaning machines, and in particular to a safety protection system and a use method of a Venlo greenhouse roof cleaning machine. Background Art

[0002] The Venlo glass greenhouse has stable environmental performance and high light transmittance, which is suitable for crop production; the large space is suitable for large machinery operation; the high strength and long service life. However, since the greenhouse is in the open air for a long time, dust often accumulates on the top of the greenhouse, and moss and other attachments are produced, which are not easy to remove, resulting in low light transmittance in the greenhouse, slowing down or even stopping the growth and development of crops, resulting in crop yield reduction. Therefore, it is necessary to clean the roof of the glass greenhouse regularly to ensure light transmittance.

[0003] Since the Venlo glass greenhouse has a large area and a high roof, the cleaning machine must ensure safety during the cleaning process. If the safety protection is not in place, it is easy to cause safety accidents such as machine crashes, causing great losses. Therefore, an efficient and stable safety protection system is urgently needed for the greenhouse roof cleaning machine. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a safety protection system and a use method for a Venlo-type greenhouse roof cleaning machine, thereby avoiding the occurrence of problems such as collision and machine fall during the cleaning process of the cleaning machine cleaning the roof and the base frame changing lines, and improving the safety of operation.

[0005] The present invention is achieved through the following technical scheme, providing a safety protection system for a Venlo type greenhouse roof cleaning machine, including a controller electrically connected to a driving device of the cleaning machine and a driving device of a base frame, and a first travel switch and a second travel switch electrically connected to the controller, the first travel switch is located on the outer side of the front wheel of the cleaning machine and is fixed to the base frame, the second travel switch is located on the rear side of the rear wheel of the cleaning machine and is fixed to the rear frame of the base frame, a touch device corresponding to the first travel switch is provided on the shed body, and a touch device corresponding to the second travel switch is provided on the cleaning machine.

[0006] In this solution, the controller obtains the on-off signals of the first stroke switch and the second stroke switch, and controls the start and stop of the driving device of the cleaning machine. During the process of the base frame driving the cleaning machine to change rows, if the first stroke switch touches the touch device on the shed body, it means that the base frame has moved to the endmost position, and the controller controls the driving device of the moving frame to stop working to prevent the base frame from continuing to move and causing the machine to fall; when the cleaning machine returns to the base frame after cleaning each row, the second stroke switch is triggered by the cleaning machine, and the controller controls the driving device of the cleaning machine to stop working to prevent the cleaning machine from continuing to run after reaching the base frame, causing the cleaning machine to collide with the base frame.

[0007] As an optimization, it also includes a third travel switch fixed on the base frame and corresponding to the top ridge of the greenhouse. The third travel switch is electrically connected to the controller, and the controller is electrically connected to the driving device of the base frame. The controller of this optimization scheme obtains the on-off signal of the third travel switch and controls the start and stop of the driving device of the base frame. When the third travel switch touches the top ridge of the greenhouse during the movement of the base frame, the driving device of the base frame keeps driving the base frame in the original direction to ensure that the base frame of the cleaning machine runs in one direction, avoids repeated cleaning of the roof by the cleaning machine, and improves the cleaning efficiency.

[0008] As an optimization, the motor protection device on the base frame is provided with a telescopic rod extending along the length direction of the greenhouse top ridge, and the end of the telescopic rod facing the greenhouse top ridge is fixedly connected with a fixed adjustment device through a cross tube buckle, and the third travel switch is installed on the fixed adjustment device. This optimization scheme can adjust the width distance of the third travel switch extending to the greenhouse through the telescopic rod, and adjust the height of the third travel switch by adjusting the connection position of the fixed adjustment device and the cross tube buckle, thereby meeting the use requirements of various sheds.

[0009] As an optimization, it also includes a first proximity switch fixed on the front wheel fender and opposite to the wheel guide rail on the base frame, and the first proximity switch is electrically connected to the controller. This optimization scheme detects whether the wheel guide rail on the base frame is placed in the gutter through the first proximity switch, and transmits the detection signal to the controller. If the wheel guide rail is detected, the cleaning machine does not move. If the wheel guide rail is not detected, the controller controls the cleaning machine drive device to work, driving the cleaning machine from the lowered wheel guide rail into the gutter to start roof cleaning, thereby avoiding collision between the cleaning machine and the wheel guide rail.

[0010] As an optimization, it also includes a second proximity switch fixed on the wire wheel bracket and electrically connected to the controller, and a sensing part corresponding to the second proximity switch is provided on the transmission sprocket coaxially fixed to the wire wheel. This optimization scheme detects and records the number of turns of the wire wheel and the water pipe through the second proximity switch. When the number of turns of the wire wheel and the water pipe wheel is equal to the set number of turns, the controller will issue a stop command, thereby further ensuring the safety of the operation of the cleaning machine when cleaning the roof, and avoiding the occurrence of serious accidents such as the cleaning machine continuing to move forward after cleaning is completed, resulting in the machine falling.

[0011] As an optimization, a third proximity switch is also included which is installed on the main suspension of the cleaning machine and corresponds to the skylight on the roof, and the third proximity switch is electrically connected to the controller. This optimization solution detects whether the skylight is open through the third proximity switch. If the skylight is detected, the controller controls the cleaning machine to stop moving to prevent the cleaning machine from colliding with the skylight.

[0012] As an optimization, a vertical detection rod is also rotatably provided on the main suspension, and the vertical distance between the lower end of the detection rod and the roof is less than the height of the skylight of the shed when it is open, and the third proximity switch is located on one side of the rotation track of the detection rod. This optimization scheme sets a detection rod. If the skylight is in the open state, the detection rod rotates after contacting the skylight, and is detected when it turns to the third proximity switch. The detection rod is used to detect the skylight, which facilitates the installation of the third proximity switch on the main suspension, avoiding the possibility of collision due to the third proximity switch being too low, and ensuring safe use.

[0013] This solution also provides a method for using the safety protection system of the Venlo greenhouse roof cleaning machine, including the following aspects:

[0014] a. By respectively arranging first travel switches on the outer sides of the two front wheels of the cleaning machine, when the first travel switches are triggered during the movement of the cleaning machine driven by the base frame, the driving device of the base frame stops working and the base frame stops moving, so as to prevent the cleaning machine from falling due to the base frame continuing to move after cleaning all the roofs;

[0015] b. A second travel switch is arranged at the rear side of the rear wheel of the cleaning machine, so as to detect the distance between the rear wheel of the cleaning machine and the base frame when the cleaning machine returns to the base frame after cleaning each row. After the second travel switch is triggered by the cleaning machine, the driving device of the cleaning machine stops working, so as to prevent the cleaning machine from continuing to run after reaching the base frame and causing the cleaning machine to collide with the base frame;

[0016] c. By setting a third travel switch on the motor protection device, the third travel switch is triggered by the greenhouse top ridge when the base frame drives the cleaning machine to move, and the base frame driving device maintains the original rotation direction to ensure that the cleaning machine base frame runs in one direction, so as to avoid repeated cleaning of the roof by the cleaning machine;

[0017] d. A first proximity switch is arranged on the front and rear four-wheel mudguards to detect whether the wheel guide rails on the base frame are placed in the gutter. If it is detected that the wheel guide rails are not lowered, the cleaning machine will not enter the gutter. If it is detected that the wheel guide rails are lowered, the cleaning machine receives the signal and enters the gutter through the wheel guide rails to start roof cleaning;

[0018] e. A second proximity switch is arranged on the wire wheel bracket to detect and record the number of revolutions of the wire wheel and the water pipe. When the number of revolutions of the wire wheel and the water pipe wheel is equal to the set number of revolutions, the controller will issue a stop command to prevent the cleaning machine from continuing to move forward after cleaning is completed, thereby preventing the cleaning machine from falling.

[0019] f. A third proximity switch is provided on the main suspension to detect the opening and closing status of the skylight on the roof. If it is detected that the skylight is in the open state, the driving device of the cleaning machine stops operating.

[0020] The beneficial effects of the present invention are:

[0021] 1. Use multiple proximity switches and travel switches to detect and control the various positions and working states of the cleaning machine, avoid serious accidents such as collision and falling of the cleaning machine during operation, increase the reliability of the cleaning machine, fully ensure the normal and orderly operation of the cleaning machine, and save a lot of time and manpower;

[0022] 2. Two travel switches are set on the base frame outside the front wheel to effectively ensure that the cleaning machine stops reliably when the cleaning work is completed. Two travel switches are set on the frame of the base frame behind the rear wheel to effectively ensure that the cleaning machine stops safely at the original position when it returns to the base frame after cleaning each row. A straight-rod adjustable travel switch is installed on the motor protection device placed in the middle of the base frame to ensure that the base frame of the cleaning machine runs in one direction, avoid repeated cleaning of the roof by the cleaning machine, and ensure cleaning efficiency;

[0023] 3. Install proximity switches on the front and rear four-wheel mudguards to effectively avoid the risk of the cleaning machine moving forward without lowering the wheel guide rails on the base frame; install proximity switches on the line wheel and water pipe wheel bracket to effectively ensure that the cleaning machine accurately returns to the base frame at the end of each row; set a proximity switch on the main suspension to effectively avoid damage to the sunroof or even damage to the cleaning machine due to the sunroof not being closed during the cleaning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an isometric view of the main frame structure of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the first travel switch on the outer side of the front wheel of the cleaning machine of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the second travel switch at the rear side of the rear wheel of the cleaning machine of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of a straight rod type travel switch on a motor protection device placed in the middle position of the base frame of the present invention;

[0028] Figure 5 This is a schematic diagram of the proximity switch structure installed on the line wheel and the water pipe wheel bracket of the present invention;

[0029] Figure 6 This is a schematic diagram of the proximity switch structure installed on the main suspension of the present invention;

[0030] Figure 7 It is a functional schematic diagram of the safety protection system of the Venlo type ceiling cleaning machine of the present invention;

[0031] As shown in the figure:

[0032] 1. First travel switch, 2. First travel switch mounting base, 3. Front wheel, 4. Gutter, 5. Front wheel mudguard, 6. First proximity switch, 7. Wheel guide, 8. Second travel switch, 9. Second travel switch mounting base, 10. Rear wheel, 11. Rear frame of base frame, 12. Rear wheel mudguard, 13. Fourth proximity switch, 14. Motor protection device, 15. Telescopic rod, 16. Fixed adjustment device, 17. Third travel switch, 18. Cross pipe buckle, 19. Greenhouse top ridge, 20. Second proximity switch, 21. Drive sprocket, 22. Wire wheel bracket, 23. Fixed plate, 24. Wire wheel, 25. Detection rod fixing device, 26. Detection rod, 27. Roof, 28. Main suspension, 29. Third proximity switch. DETAILED DESCRIPTION

[0033] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0034] like Figures 1 to 7 The safety protection system of a Venlo-type greenhouse roof cleaning machine shown in the figure includes a controller electrically connected to the driving device of the cleaning machine and the driving device of the base frame, a travel switch group for detecting the moving position of the cleaning machine and the direction of the base frame when changing lines, and a proximity switch group for detecting the retracted and extended state of the wheel guide rail 7 of the base frame, the retracted and extended meters of the wire wheel and the water pipe wheel, and the state of the roof skylight. Each travel switch in the travel switch group, each proximity switch in the proximity switch group, and the base frame driving device driving the base frame to move are all electrically connected to the controller. In this embodiment, a total of ten proximity switches and five travel switches are set, and each travel switch and proximity switch are used to detect the various position states of the cleaning machine and the base frame during the working process. When a dangerous situation occurs, safety protection measures are taken to avoid collisions and machine crashes.

[0035] The travel switch group includes a first travel switch 1, a second travel switch 8 and a third travel switch 17 which are electrically connected to the controller.

[0036] The first stroke switch is located on the outside of the front wheel 3 of the cleaning machine and is fixed to the base frame. A touch device corresponding to the first stroke switch is provided on the shed body. The touch device corresponding to the first stroke switch can be a baffle fixed to the shed body. When the shed body moves to a position close to the end of the shed body, the first stroke switch touches the baffle to stop the shed body from moving, thereby limiting the shed body. The first stroke switch is provided on the outside of the two front wheels of the cleaning machine. Two first stroke switch mounting brackets 2 are installed above the shed body on which the cleaning machine is placed, 30 to 35 cm away from the center of the front wheel. The first stroke switch is installed on the first stroke switch mounting bracket, 30 to 35 cm away from the center of the front wheel of the cleaning machine. The first stroke switch 1 is used to prevent the cleaning machine from being suspended in the air after the shed body 27 is cleaned and the shed body continues to run, thereby avoiding serious accidents such as the cleaning machine falling.

[0037] The second stroke switch is located at the rear side of the rear wheel 10 of the cleaning machine and is fixedly connected to the rear frame 11 of the base frame. The cleaning machine is provided with a touch device corresponding to the second stroke switch. In this embodiment, the touch device corresponding to the second stroke switch is the rear wheel of the cleaning machine. When the rear wheel of the cleaning machine touches the second stroke switch, the cleaning machine stops moving and stops on the base frame. Specifically, the second stroke switch is installed on the second stroke switch mounting bracket 9, and the second stroke switch mounting bracket 9 is fixed on the rear frame of the base frame where the cleaning machine is placed. By setting the two second stroke switches on the rear side of the two rear wheels, when the cleaning machine returns to the base frame after cleaning each row, it is prevented from continuing to run after reaching the base frame, causing the cleaning machine to collide with the rear frame of the base frame and be damaged or even fall.

[0038] The third travel switch 17 is fixed on the base frame and corresponds to the greenhouse top ridge 19. The third travel switch is electrically connected to the controller, and the controller is electrically connected to the driving device of the base frame. The third travel switch of this embodiment is a straight rod travel switch. The touch rod of the third travel switch is vertically arranged upward. When the touch rod touches the top ridge, it is compressed and triggered, so that the driving device of the base frame maintains the original direction to drive the base frame. In order to achieve the horizontal and vertical position adjustment of the third travel switch, the motor protection device 14 on the base frame is provided with a telescopic rod 15 extending along the length direction of the greenhouse top ridge in this embodiment. The end of the telescopic rod facing the greenhouse top ridge is fixedly connected with a fixed adjustment device 16 through a cross tube buckle 18, and the third travel switch is installed on the fixed adjustment device. The relative height of the third travel switch 17 and the greenhouse top ridge 19, as well as the width distance extending to the greenhouse are both adjustable. The width distance extending to the greenhouse is adjusted by the telescopic rod 15, and the relative height to the greenhouse top ridge is adjusted by the fixed adjustment device 16 used to fix the travel switch. The upper contact of the third travel switch 17 is 30 mm higher than the greenhouse top ridge, and the outermost side of the travel switch is not less than 20 mm from the greenhouse side. The fixed adjustment device 16 can adjust the height of the third travel switch and reverse the third travel switch when installing and disassembling the cleaning machine.

[0039] The proximity switch group includes a first proximity switch 6 , a second proximity switch 20 , a third proximity switch 29 and a fourth proximity switch 13 which are electrically connected to the controller.

[0040] There are two first proximity switches 6, which are respectively fixed on the two front wheel mudguards 5 of the cleaning machine and are opposite to the wheel guides 7 on the base frame. There are two fourth proximity switches 13, which are respectively fixed on the two rear wheel mudguards 12 of the cleaning machine and are opposite to the wheel guides 7 on the base frame. The first proximity switch and the fourth proximity switch are used for the cleaning machine to detect whether the wheel guides 7 on the base frame are placed in the gutter 4 before starting. If it is detected that the wheel guides are not lowered, the cleaning machine will not enter the gutter. If it is detected that the wheel guides have been lowered, the cleaning machine receives the signal and enters the gutter through the wheel guides to start cleaning the roof. The end of the gutter is equipped with an end gutter protection device, so as to further ensure the safe operation of the cleaning machine when cleaning the roof, and avoid accidents such as the cleaning machine continuing to move forward after cleaning is completed, resulting in the occurrence of accidents such as the machine falling.

[0041] The second proximity switch 20 is fixed on the fixing plate 23 fixed to the wire wheel bracket 22, and the driving sprocket 21 coaxially fixed to the wire wheel 24 is provided with a sensing part corresponding to the second proximity switch. The second proximity switch 20 is used to detect and record the number of revolutions of the wire wheel and the water pipe wheel. When the number of revolutions of the wire wheel and the water pipe wheel is equal to the set number of revolutions, the control box will issue a stop command, effectively ensuring that the cleaning machine accurately returns to the base frame at the end of each row.

[0042] The third proximity switch 29 is installed on the main suspension 28 of the cleaning machine and corresponds to the skylight on the roof. The third proximity switch is used to detect the opening and closing state of the skylight. In order to facilitate the installation of the third proximity switch, the present embodiment also rotatably sets a vertical detection rod 26 on the main suspension. The vertical distance between the lower end of the detection rod and the roof is less than the height of the skylight when the roof is opened. The third proximity switch is located on one side of the rotation track of the detection rod. Specifically, a detection rod fixing device 25 is fixedly installed on the main suspension, and a vertical detection rod 26 is installed on the detection rod fixing device. The distance between the detection rod and the roof is 10mm. When the skylight is in the open state, it will be detected by the detection rod, and the detection rod will produce a corresponding rotation action and be sensed by the third proximity switch. The third proximity switch will generate a signal to the controller. The controller controls the cleaning machine to stop running to avoid collision. The detection rod can effectively cooperate with the third proximity switch to detect whether the skylight is in the open state, thereby ensuring that the machine can operate safely.

[0043] When the cleaning machine starts to clean the roof, the first proximity switch for detecting the wheel guide installed at the front wheel fender detects whether the guide is lowered. If the wheel guide is lowered, the proximity switch transmits a signal to the control box, and the cleaning machine starts to operate. Otherwise, the cleaning machine will not move forward. When the cleaning machine passes through the guide rail into the gutter and starts to clean the roof, if the skylight on the roof is not closed, it will be detected by the detection rod installed on the main suspension. The third proximity switch transmits a signal to the controller to stop the cleaning machine from moving forward, effectively ensuring the working safety of the greenhouse skylight and the cleaning machine; when cleaning to the edge of the roof, the proximity switches on the cleaning machine's wire wheel and water pipe wheel also count the number of turns of the sprocket at the same time, and transmit the signal to the controller, so that the control box makes corresponding action instructions, thereby effectively avoiding the cleaning machine from continuing to move forward after cleaning to the edge of the roof, causing the machine to fall.

[0044] When the cleaning machine returns to the base frame after cleaning a row of roofs, the travel switch on the frame of the base frame behind the rear wheel is triggered and transmits a signal to the controller, so that the cleaning machine can stop reliably on the base frame of the cleaning machine. The wheel guide rail on the base frame rises, and the proximity switch installed on the front wheel mudguard senses and transmits a signal to the controller, thus completing a complete cleaning process of the roof. The straight rod travel switch of the motor protection device placed in the middle of the base frame ensures that the base frame of the cleaning machine can only move in one direction and will not miss or re-brush the roof. In this embodiment, the cleaning machine and the base frame have a total of ten proximity switches and five travel switches on the safety protection system, which effectively and reliably prevents the cleaning machine from unexpected situations during the movement process.

[0045] The present embodiment provides a method for using a safety protection system of a Venlo greenhouse roof cleaning machine, including the following aspects:

[0046] a. By respectively arranging first travel switches on the outer sides of the two front wheels of the cleaning machine, when the first travel switches are triggered during the movement of the cleaning machine driven by the base frame, the driving device of the base frame stops working, so as to prevent the cleaning machine from falling due to the base frame continuing to move after cleaning all the roofs;

[0047] b. A second travel switch is arranged at the rear side of the rear wheel of the cleaning machine, so as to detect the distance between the rear wheel of the cleaning machine and the base frame when the cleaning machine returns to the base frame after cleaning each row. After the second travel switch is triggered by the cleaning machine, the driving device of the cleaning machine stops working, so as to prevent the cleaning machine from continuing to run after reaching the base frame and causing the cleaning machine to collide with the base frame;

[0048] c. By setting a third travel switch on the motor protection device, the third travel switch is triggered by the greenhouse top ridge when the base frame drives the cleaning machine to move, and the base frame driving device maintains the original rotation direction to ensure that the cleaning machine base frame runs in one direction, so as to avoid repeated cleaning of the roof by the cleaning machine;

[0049] d. A first proximity switch is arranged on the front and rear four-wheel mudguards to detect whether the wheel guide rails on the base frame are placed in the gutter. If it is detected that the wheel guide rails are not lowered, the cleaning machine will not enter the gutter. If it is detected that the wheel guide rails are lowered, the cleaning machine receives the signal and enters the gutter through the wheel guide rails to start roof cleaning;

[0050] e. A second proximity switch is arranged on the wire wheel bracket to detect and record the number of revolutions of the wire wheel and the water pipe. When the number of revolutions of the wire wheel and the water pipe wheel is equal to the set number of revolutions, the controller will issue a stop command to prevent the cleaning machine from continuing to move forward after cleaning is completed, thereby preventing the cleaning machine from falling.

[0051] f. A third proximity switch is provided on the main suspension to detect the opening and closing status of the skylight on the roof. If it is detected that the skylight is in the open state, the driving device of the cleaning machine stops operating.

[0052] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A safety protection system for a Venlo greenhouse roof cleaning machine, characterized in that: It comprises a controller electrically connected to a driving device of the cleaning machine and a driving device of a base frame, and a first travel switch (1) and a second travel switch (8) electrically connected to the controller, the first travel switch being located at the outer side of the front wheel of the cleaning machine and being fixed to the base frame, the second travel switch being located at the rear side of the rear wheel of the cleaning machine and being fixed to a rear frame (11) of the base frame, a touch device corresponding to the first travel switch being provided on the shed body, and a touch device corresponding to the second travel switch being provided on the cleaning machine; It also includes a third travel switch (17) fixed on the base frame and corresponding to the greenhouse top ridge (19), the third travel switch is electrically connected to the controller, and the controller is electrically connected to the driving device of the base frame; It also includes a first proximity switch (6) fixed on the front wheel mudguard (5) and opposite to the wheel guide rail (7) on the base frame, and the first proximity switch is electrically connected to the controller; It also includes a second proximity switch (20) fixedly mounted on the wire wheel bracket (22) and electrically connected to the controller, and a driving sprocket (21) coaxially fixedly connected to the wire wheel is provided with a sensing portion corresponding to the second proximity switch; It also includes a third proximity switch (29) installed on the main suspension frame (28) of the cleaning machine and corresponding to the skylight on the roof, and the third proximity switch is electrically connected to the controller; The method for using the Venlo greenhouse roof cleaning machine safety protection system includes the following aspects: a. By respectively arranging first travel switches on the outer sides of the two front wheels of the cleaning machine, when the first travel switches are triggered during the movement of the cleaning machine driven by the base frame, the driving device of the base frame stops working, so as to prevent the cleaning machine from falling due to the base frame continuing to move after cleaning all the roofs; b. A second travel switch is arranged at the rear side of the rear wheel of the cleaning machine, so as to detect the distance between the rear wheel of the cleaning machine and the base frame when the cleaning machine returns to the base frame after cleaning each row. After the second travel switch is triggered by the cleaning machine, the driving device of the cleaning machine stops working, so as to prevent the cleaning machine from continuing to run after reaching the base frame and causing the cleaning machine to collide with the base frame; c. By setting a third travel switch on the motor protection device, the third travel switch is triggered by the greenhouse top ridge when the base frame drives the cleaning machine to move, and the base frame driving device maintains the original rotation direction to ensure that the cleaning machine base frame runs in one direction, so as to avoid repeated cleaning of the roof by the cleaning machine; d. A first proximity switch is arranged on the front and rear four-wheel mudguards to detect whether the wheel guide rails on the base frame are placed in the gutter. If it is detected that the wheel guide rails are not lowered, the cleaning machine will not enter the gutter. If it is detected that the wheel guide rails are lowered, the cleaning machine receives the signal and enters the gutter through the wheel guide rails to start roof cleaning; e. A second proximity switch is arranged on the wire wheel bracket to detect and record the number of revolutions of the wire wheel and the water pipe. When the number of revolutions of the wire wheel and the water pipe wheel is equal to the set number of revolutions, the controller will issue a stop command to prevent the cleaning machine from continuing to move forward after cleaning is completed, thereby preventing the cleaning machine from falling. f. A third proximity switch is provided on the main suspension to detect the opening and closing status of the skylight on the roof. If it is detected that the skylight is in the open state, the driving device of the cleaning machine stops operating.

2. A Venlo greenhouse roof cleaning machine safety protection system according to claim 1, characterized in that: A motor protection device (14) on the base frame is provided with a telescopic rod (15) extending along the length direction of the greenhouse top ridge, and one end of the telescopic rod facing the greenhouse top ridge is fixedly connected to a fixed adjustment device (16) via a cross tube buckle (18), and a third travel switch is mounted on the fixed adjustment device.

3. A Venlo greenhouse roof cleaning machine safety protection system according to claim 1, characterized in that: A vertical detection rod (26) is also rotatably provided on the main suspension, the vertical distance between the lower end of the detection rod and the roof is less than the height of the skylight of the shed when it is opened, and the third proximity switch is located on one side of the rotation track of the detection rod.

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