A greenhouse lifting and horizontal safety device

Abstract

This invention relates to a safety device for leveling a greenhouse, applicable to a liftable greenhouse where the roof is hoisted at multiple points using multiple lifting mechanisms. It includes a main control module and an alarm module; it also includes: a horizontal pipe fixed to the roof of the liftable greenhouse and arranged along the length of the roof; and several vertical pipes, the lower ends of which are connected to the horizontal pipe, forming a communicating vessel structure filled with liquid. The advantages of this invention are: it effectively improves the problem of concentrated loads at localized suspension points and excessive force on one side caused by an uneven roof, addressing the long-term suspended and static working conditions of liftable greenhouses after height adjustment. It avoids long-term hidden dangers such as bending and twisting of greenhouse beams and columns, structural fatigue damage, and loosening of components, prevents roof misalignment and tearing of the greenhouse film, ensures a stable planting environment inside the greenhouse, and significantly improves the structural stability and operational safety of liftable greenhouses.

Description

Technical Field

[0001] This invention belongs to the technical field of greenhouse monitoring devices, specifically relating to a greenhouse lifting and leveling safety device. Background Technology

[0002] Height-adjustable greenhouses are a commonly used high-quality planting facility in modern agriculture, offering greater adaptability compared to traditional fixed greenhouses. The roof height can be flexibly adjusted according to seasonal conditions. Lowering the roof in winter reduces heat loss, improves insulation, and lowers heating energy consumption; raising the roof in summer enhances natural ventilation and heat dissipation, reducing energy consumption for cooling equipment. This structure effectively addresses the problems of high ventilation and insulation energy consumption, high planting and operating costs, and poor economic benefits associated with traditional greenhouses. It is adaptable to various modern planting models, demonstrating significant comprehensive advantages.

[0003] Liftable greenhouses often employ a multi-point hoisting and coordinated lifting structure. After the greenhouse height is adjusted, it is often in a suspended and static state for extended periods. The horizontal balance of the greenhouse roof directly determines the uniformity of stress on each hoisting point and the overall structural safety. If the hoisting mechanisms are not synchronized, the greenhouse roof cannot remain level, resulting in concentrated loads and excessive stress on localized hoisting points. Long-term eccentric stress can lead to roof tilting and misalignment, causing uneven stress on the greenhouse beams and columns, resulting in bending and torsional deformation, loosening of components, structural fatigue damage, and significantly shortening the greenhouse's lifespan. Simultaneously, roof misalignment can tear the greenhouse film, disrupting the sealed environment inside and affecting normal crop growth. Severe lifting deviations can also cause overload damage to the hoisting equipment, easily leading to greenhouse collapse accidents, resulting not only in crop damage and production stoppage but also posing significant safety hazards.

[0004] In summary, liftable greenhouses have good environmental adaptability and practicality for planting, and their application advantages are significant. However, due to the limitation of the multi-point hoisting and coordinated lifting structure, the problem of asynchronous lifting can easily lead to the greenhouse roof not being level, which in turn causes damage to the greenhouse structure, equipment damage and safety hazards, seriously restricting the stable and safe operation of liftable greenhouses. Summary of the Invention

[0005] This invention provides a greenhouse lifting and leveling safety device, which can solve the problems of structural damage, equipment damage and safety hazards caused by asynchronous lifting in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a greenhouse lifting and leveling safety device, applied to a liftable greenhouse in which the roof is lifted at multiple points through multiple lifting and hoisting mechanisms, comprising: A horizontal pipe is fixedly installed on the roof of the liftable shed and arranged along the length of the roof. Several vertical pipes, the lower ends of which are connected to the horizontal pipe, together forming a communicating vessel structure, the communicating vessel being filled with liquid; the roof area corresponding to two adjacent lifting and hoisting mechanisms constitutes a hoisting and hoisting position, and each hoisting and hoisting position is provided with at least one vertical pipe at each end; A liquid level sensor is installed in each vertical pipe to match the number of vertical pipes. When the liquid level in the corresponding vertical pipe drops by a predetermined multiple of the limit allowable deformation of the roof component corresponding to the hoisting position, the liquid level sensor outputs a signal. The main control module is connected to all liquid level sensor signals and is used to control all lifting and hoisting mechanisms to stop and lock up after receiving a signal output by any liquid level sensor. An alarm module is connected to all liquid level sensors and is used to activate an alarm upon receiving a signal from any liquid level sensor.

[0007] Preferably, the canopy includes longitudinal beams and transverse beams; the horizontal pipe includes a longitudinal horizontal pipe and a transverse horizontal pipe, which are respectively installed on the longitudinal beams and transverse beams, and are connected to form an integral connected pipeline surrounding the canopy.

[0008] Preferably, the vertical pipe is positioned directly opposite the greenhouse hoisting point, and the central axis of the vertical pipe coincides with the vertical force center line of the corresponding hoisting point.

[0009] Preferably, the preset multiple ranges from 0.5 to 0.8.

[0010] Preferably, the liquid is an ethylene glycol-based antifreeze with a freezing point not higher than -25°C.

[0011] Preferably, the connection between the horizontal pipe and the vertical pipe is sealed with a sealing joint, and the entire communicating vessel structure is a closed structure.

[0012] Preferably, the top end of the vertical pipe is provided with a removable sealing cap.

[0013] Preferably, the sealing cover is provided with an automatic exhaust valve.

[0014] Preferably, the alarm module includes several audible and visual alarms, each of which is correspondingly set with one of several vertical pipes and is only connected to the liquid level sensor signal on the corresponding vertical pipe.

[0015] Compared to existing technologies, this invention utilizes a communicating vessel paired with a liquid level sensor to monitor the synchronous lifting and lowering of the greenhouse roof in real time. Leveraging the characteristic that the liquid level in the communicating vessel changes in tandem with the roof's horizontal position, it can accurately detect lifting and lowering deviations in the multi-point hoisting mechanisms of the greenhouse. When asynchronous lifting or roof tilting / misalignment occurs, the device immediately identifies the anomaly, triggers an alarm, and controls all hoisting mechanisms to stop and lock in place, promptly preventing malfunctions. For operations where the height of a liftable greenhouse is adjusted and the structure remains suspended for extended periods, this invention effectively improves the problems of concentrated loads at localized hanging points and excessive force on one side caused by an uneven roof. It avoids long-term hazards such as bending and twisting of greenhouse beams and columns, structural fatigue damage, and loosening of components, eliminates roof misalignment and tearing of the greenhouse film, ensures a stable planting environment inside the greenhouse, and significantly improves the structural stability and operational safety of the liftable greenhouse. Attached Figure Description

[0016] Figure 1 This is a first-view structural diagram of an embodiment of the present invention; Figure 2 For the present invention Figure 1 The second-view structural diagram of the embodiment shown; Figure 3 For the present invention Figure 1 A partial structural diagram of the embodiment shown; Figure 4 This is a cross-sectional schematic diagram of the communicating vessel structure of the present invention; Figure 5 This is a first-view structural diagram of another embodiment of the present invention; Figure 6 For the present invention Figure 5 A partial structural diagram of the embodiment shown; Figure 7 This is a schematic diagram of the actual application of a lifting canopy.

[0017] In the diagram: 1. Shed; 2. Shed roof; 201. Longitudinal beam; 202. Horizontal beam; 3. Lifting and hoisting mechanism; 4. Horizontal pipe; 401. Longitudinal horizontal pipe; 402. Transverse horizontal pipe; 5. Vertical pipe; 6. Liquid level sensor; 7. Main control module; 8. Alarm module; 9. Liquid; 10. Sealing cover. Detailed Implementation

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solution of this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] like Figures 1 to 4 As shown, the present invention provides a greenhouse lifting level safety device, which is applied to a liftable greenhouse whose roof 2 is lifted at multiple points by multiple lifting and hoisting mechanisms 3. The device includes: a horizontal pipe 4, several vertical pipes 6, a liquid level sensor 6 matching the number of vertical pipes, a main gate control module 7, and an alarm module 8.

[0020] The horizontal pipe 4 is fixedly installed on the roof 2 of the liftable shed and arranged along the length of the roof 2.

[0021] The lower end of the vertical pipe 5 is connected to the horizontal pipe 4, and the two together form a communicating vessel structure. The communicating vessel is filled with liquid 9. The roof area corresponding to two adjacent lifting and hoisting mechanisms 3 is a hoisting and hoisting position. Each hoisting and hoisting position is provided with at least one vertical pipe 5 at each end.

[0022] Each liquid level sensor 6 is installed in a vertical pipe 5; when the liquid level in the corresponding vertical pipe 5 drops by a preset multiple of the limit allowable deformation of the roof component corresponding to the hoisting position, the liquid level sensor 6 outputs a signal. The main gate control module 7 is connected to all liquid level sensors 6 and is used to control all lifting and hoisting mechanisms 3 to stop and lock after receiving a signal output by any liquid level sensor 6. The alarm module 8 is connected to all liquid level sensors 6 and is used to activate the alarm after receiving a signal output by any liquid level sensor 6.

[0023] Specifically, the frame 1, as the overall load-bearing base of the greenhouse, mainly supports the lifting and hoisting mechanism 3, the roof 2, and the entire set of safety devices, bearing the weight of the greenhouse structure and the load of the lifting operation. Hot-dip galvanized steel pipes or aluminum alloy profiles are preferred materials due to their excellent rust resistance and suitability for open-air environments. During installation, it is assembled as a whole according to the greenhouse design dimensions to ensure the overall structural stability of the frame. It should be noted that the overall levelness error of the assembled frame 1 should not be too large to prevent the roof 2 from tilting pre-existingly. The frame 1 can be constructed using a fully welded steel frame, a prefabricated bolted steel frame, or other structures.

[0024] The roof 2 serves as the mounting base for the horizontal pipe 4, supporting the entire connecting pipeline assembly. It is suspended and lifted by the hoisting mechanism 3. The components are primarily made of galvanized steel, offering high structural strength and resistance to outdoor deformation. During installation, it is suspended entirely within the frame 1. It is important to ensure that the roof 2 achieves a smooth, even surface after assembly, facilitating the stable laying of the horizontal pipe 4. The roof 2 can utilize a modular, integrally welded profile structure.

[0025] The lifting and hoisting mechanism 3 is fixedly mounted on the canopy 1 and connected to the canopy roof 2 via a suspension method. It adjusts the height of the canopy roof 2 through its own traction action, and is controlled by the main switch module 7 under unified power-off control. It uses standard materials and is equipped with a winch and wire rope assembly. Each hoisting point is matched with a separate lifting and hoisting mechanism 3. It should be noted that the initial lifting reference of all lifting and hoisting mechanisms 3 should be consistent. The lifting and hoisting mechanism 3 can be a winch-type wire rope traction type or a screw-push type structure. It should be noted that the lifting and hoisting mechanism 3 should have self-locking capability and automatically lock after power failure.

[0026] Horizontal pipe 4 is laid and fixed to the ceiling 2, connecting with multiple vertical pipes 5 to form a main connecting pipe, enabling full-area communication of the internal liquid 9. Food-grade PVC rigid pipe or 304 stainless steel thin-walled pipe can be selected. It should be fixed straight along the length of the ceiling 2 during installation. It is important to ensure that the entire pipeline is laid horizontally, avoiding any local bulges or subsidence. Horizontal pipe 4 can be made of either plastic or metal.

[0027] The lower end of the vertical pipe 5 is sealed and connected to the horizontal pipe 4, forming a connected cavity together. The height difference caused by the misalignment of the lifting points will be converted into changes in the liquid level inside the vertical pipe 5 through the liquid 9. Transparent acrylic pipes and rigid PVC transparent pipes are preferred for easy observation of the liquid level. During installation, the vertical pipe 5 is fixed vertically and aligned with the center of the corresponding lifting point. It should be noted that the installation of the vertical pipe 5 must ensure verticality to avoid the pipe wall tilting interfering with the accuracy of the liquid level. The vertical pipe 5 can be a single straight pipe or a multi-section sealed joint pipe structure.

[0028] The liquid level sensor 6 is fixedly installed on the wall of the vertical pipe 5 to capture abnormal changes in the liquid level within the vertical pipe 5 in real time, and converts the physical changes into electrical signals, which are then transmitted to the alarm module 8 and the main control module 7. Capacitive and float-triggered sensing elements are commonly used. An alarm signal is sent when the liquid level drops above a preset multiple of the allowable deformation limit of the roof component corresponding to the hoisting position. The allowable deformation limit of the roof component is the maximum safe deformation allowed within the design specifications for the roof structure corresponding to the hoisting position. When the roof deformation exceeds this value, irreversible plastic deformation, structural damage, or tearing of the greenhouse film will occur. The allowable deformation limit can be directly determined according to the purpose of the component, based on the "GB / T 51424-2022 Standard for Structural Design of Agricultural Greenhouses". Assuming the span of the hoisting position is L, the allowable deformation ω of the main roof beams (main longitudinal beams and main transverse beams) is taken as the smaller value between L / 250 and 30mm. The so-called preset multiple is a safety redundancy coefficient artificially preset after considering factors such as the importance of crops, the importance of the greenhouse structure, and the economic benefits of maintenance. The specific value should be between 0 and 1, so that the alarm system does not only trigger protection when the greenhouse roof deformation reaches its limit, but uses a preset multiple of the limit allowable deformation as an early warning threshold. When installing liquid level sensors, each riser should be installed vertically, and the inner diameter of the risers at both ends of the same hoisting position should be consistent. When the greenhouse is in a normal horizontal state, the initial liquid level in the riser should be higher than the detection position of the liquid level sensor to avoid false alarms when stationary. A vertical descent travel is allowed between the liquid level and the sensor. This travel is not less than a preset multiple of the limit allowable deformation of the greenhouse structure components, with an additional 2-5mm safety margin to ensure that when the liquid level in the riser drops to a preset multiple of the limit allowable deformation, the liquid level can accurately reach the sensor detection position and trigger the alarm signal. It should be noted that the installation point should be far away from pipe sealing joints to prevent leakage from affecting sensor detection.

[0029] The main control module 7 receives abnormal signals from the liquid level sensor 6. Upon receiving the signal, it cuts off the power supply circuit to all lifting and hoisting mechanisms 3, relying on the equipment's original braking lock to stop the lifting action. The main body uses small relay integrated boards and general-purpose electrical control components. During installation, all components are centrally stored inside the greenhouse electrical control box. It should be noted that the module wiring should distinguish between low-voltage signal lines and power supply lines to avoid line interference.

[0030] The alarm module 8 receives abnormal electrical signals output by the liquid level sensor 6 and provides fault alarm indication. Conventional active alarm devices are selected. During installation, it should be placed nearby within the greenhouse for easy viewing by staff. It is important to note that the connection lines between the alarm module 8 and the liquid level sensor 6 should be protected against damage and short circuits caused by outdoor conditions.

[0031] Liquid 9 fills the inside of the sealed communicating vessel pipe and flows within the pipe by gravity, converting the height difference of the suspension points into the rise and fall of the liquid level in the vertical pipe 5, serving as the medium for physical monitoring. Ethylene glycol-based antifreeze is typically used in low-temperature scenarios, while clean water can be used in normal-temperature environments. During setup, fill the pipe to the calibrated liquid level through the filling port at the top of the vertical pipe 5. It is important to note that after filling, the air inside the pipe should be completely purged using the sealing structure.

[0032] In practical use, the horizontal pipe 4 and the vertical pipe 5 are first fixed to the roof 2 suspended by the lifting and hoisting mechanism 3 and connected to each other to form a communicating vessel. Liquid 9 is added inside the communicating vessel. Each vertical pipe 5 is equipped with a liquid level sensor 6 and connected to the alarm module 8 and the main control module 7 respectively. During normal lifting and hoisting operation of the greenhouse, each hoisting point moves synchronously and the liquid level remains stable. Once some lifting and hoisting mechanisms 3 move inconsistently and produce a height difference, the liquid 9 flows in the communicating pipe and changes the liquid level of the corresponding vertical pipe 5. After the liquid level sensor 6 detects the abnormal signal, it drives the alarm module 8 to issue an alarm and cuts off the power supply of the lifting and hoisting mechanism 3 through the main control module 7. The machine is stopped by its own brake lock, thus completing the safety protection.

[0033] like Figures 5 to 6 As shown, in order to solve the problem of limited coverage and easy occurrence of monitoring blind spots when laying a single pipeline, preferably, the roof 2 includes a longitudinal beam 201 and a transverse beam 202; the horizontal pipe 4 includes a longitudinal horizontal pipe 401 and a transverse horizontal pipe 402, the longitudinal horizontal pipe 401 and the transverse horizontal pipe 402 are respectively installed on the longitudinal beam 201 and the transverse beam 202, and the longitudinal horizontal pipe 401 and the transverse horizontal pipe 402 are connected to form an integral connected pipeline around the roof 2.

[0034] Specifically, the horizontal pipe 4 adopts a combined layout of longitudinal and transverse connections and is laid along the entire roof 2, which can completely cover all the areas where the hoisting points of the roof 2 are located. When any hoisting mechanism 3 is not synchronized and a height difference occurs, the corresponding liquid level change can be transmitted to the nearest vertical pipe 5 through the liquid 9 in the interconnecting pipeline, completely eliminating the monitoring blind spots caused by the lack of pipeline coverage in some areas. The integrated interconnecting structure reduces the processing and installation of a large number of scattered short pipes, and the planning of pipe material usage is more reasonable. Compared with the scattered segmented pipeline layout, the overall procurement and labor installation costs are lower, further improving the shortcomings of the original electrical equipment parts being numerous and expensive. The horizontal pipe 4 is divided into longitudinal and transverse segmented layout structures, and the pipe material is PVC rigid pipe or 304 stainless steel pipe. When installing, the joint positions of the longitudinal and transverse pipes are aligned and sealed. It should be noted that after the entire section of the horizontal pipe 4 is laid after longitudinal and transverse splicing, it is on the same horizontal plane.

[0035] like Figures 1 to 2As shown, in order to improve the existing shortcomings of the inability to accurately transmit the displacement of the hoisting point to the pipeline and the insufficient monitoring sensitivity, preferably, the vertical pipe 5 is set directly opposite to the hoisting point of the greenhouse, and the central axis of the vertical pipe 5 coincides with the vertical force center line of the corresponding hoisting point.

[0036] Specifically, the vertical pipe 5 is arranged to coincide with the central axis of the hoisting point. When the lifting and hoisting mechanism 3 causes a local height shift in the roof 2, the vertical displacement of the hoisting point can be directly and synchronously applied to the installation position of the vertical pipe 5. The deformation of the roof can be converted into the flow of liquid 9 in the cavity formed by the horizontal pipe 4 and the vertical pipe 5 without loss, which quickly changes the liquid level height of the corresponding vertical pipe 5. The liquid level sensor 6 can capture the small liquid level changes in time. Compared with the traditional multi-point electrical sensor that relies on algorithms to calculate the height difference, it avoids the data drift problem caused by environmental interference, improves the monitoring accuracy, reduces the probability of false alarms and false shutdowns of the equipment, and reduces the maintenance costs of later debugging and calibration.

[0037] In order to achieve the purpose of triggering protective actions in advance before the deformation of the shed components reaches the limit of allowable deformation specified in the standard, and to reserve a sufficient safety buffer space for the liftable shed, preferably, the value range of the preset multiple is 0.5 to 0.8.

[0038] Specifically, limiting the preset multiplier to 0.5–0.8 allows for early alarm and shutdown protection before the greenhouse frame deformation reaches its limit. It prevents deformation accumulation during the elastic deformation stage, thus preventing structural deformation and greenhouse film damage. This range reasonably balances detection sensitivity and resistance to false triggering: if the preset multiplier is less than 0.5, the device's sensitivity is too high, and even slight normal shaking of the greenhouse, installation deviations, or environmental disturbances will cause frequent false shutdowns, affecting normal agricultural production; if the preset multiplier is greater than 0.8, the warning point is too close to the structural deformation limit, with insufficient safety margin, making it difficult to handle sudden asynchronous lifting and potentially causing structural damage. Simultaneously, it adapts to the installation structure of the vertical pipe and sensor, ensuring accurate trigger judgment and early mitigation of localized uneven load on lifting points, preventing overload of the lifting equipment and effectively improving the safety and lifespan of the greenhouse operation.

[0039] To address the problem of liquid freezing inside the pipe in low-temperature environments, which causes the communication device to fail and become unmonitorable, preferably, the liquid 9 is an ethylene glycol-based antifreeze with a freezing point temperature not higher than -25°C.

[0040] Specifically, ethylene glycol-based antifreeze with a freezing point no higher than -25℃ is selected as liquid 9. Even in the frigid winter, liquid 9 will not freeze or clog the pipeline. The communicating vessel formed by the horizontal pipe 4 and the vertical pipe 5 can function normally as a level sensor throughout the year. The device can be used stably in various outdoor temperature environments in both northern and southern my country. There is no need to drain the medium from the pipeline before winter and refill with clean water in spring, saving on seasonal maintenance consumables and labor time. This reduces equipment maintenance costs from the medium level and overcomes the shortcomings of the original electrical control equipment, such as component failure and monitoring malfunction in low-temperature environments. Liquid 9 fills the communicating cavity formed by the horizontal pipe 4 and the vertical pipe 5. Ethylene glycol antifreeze is a common chemical raw material. During installation, it is filled from the top of the vertical pipe 5 to the standard liquid level. It should be noted that the temperature of the added liquid 9 should be as close as possible to the ambient temperature to reduce the formation of air bubbles in the pipeline.

[0041] In order to avoid the defects of liquid leakage and evaporation loss, which cause changes in the reference liquid level of the communicating vessel and a year-by-year decline in monitoring accuracy, preferably, the connection between the horizontal pipe 4 and the vertical pipe 5 is sealed with a sealing joint, and the entire communicating vessel structure is a closed structure.

[0042] Specifically, the connection between the horizontal pipe 4 and the vertical pipe 5 is fully sealed by a sealing joint, effectively preventing the liquid 9 from leaking from the pipe joint or evaporating and being lost over a long period of time. The total volume of the liquid 9 inside the communicating vessel remains constant over a long period of time, and the liquid level reference value of the entire device will not gradually shift with the years of use, eliminating the need to frequently open the cover to replenish the liquid 9. This ensures stable and accurate long-term monitoring data while significantly reducing the daily investment in liquid replenishment consumables. Compared with the open pipeline structure, the maintenance workload is significantly reduced, further optimizing the economic efficiency of the device.

[0043] The sealing joint is used for the butt sealing of horizontal pipe 4 and vertical pipe 5. A rubber sealing gasket can be used with a plastic or stainless steel compression fitting. A sealing gasket should be installed inside the joint during installation. It should be noted that the joint should be tightened with moderate force to prevent deformation of the horizontal pipe 4 and vertical pipe 5 due to compression.

[0044] like Figure 4 As shown, in order to overcome the difficulties of replenishing liquid and the cumbersome disassembly and assembly of internal maintenance after the closed pipeline is sealed, preferably, the top of the vertical pipe 5 is provided with a detachable sealing cap 10.

[0045] Specifically, the top of the vertical pipe 5 is equipped with a removable sealing cap 10. When it is necessary to replenish the lost liquid 9 or troubleshoot pipe blockage and leakage, it is only necessary to unscrew the sealing cap 10 to operate from the top of the vertical pipe 5. There is no need to disassemble the sealing joint between the horizontal pipe 4 and the vertical pipe 5, thus avoiding damage to the original sealing structure and leakage caused by disassembling the joint. The maintenance operation steps are simplified, the fault repair efficiency is improved, the loss of parts caused by large-scale pipe disassembly and repair is reduced, and the later maintenance costs are continuously controlled.

[0046] The sealing cap 10 seals the upper opening of the vertical pipe 5. It is made of plastic or metal. When installing, it is threaded onto the opening of the vertical pipe 5. It is important to ensure that the opening of the vertical pipe 5 is sealed tightly after tightening the sealing cap 10 to prevent leakage.

[0047] In order to eliminate the problem of gas accumulation inside the pipeline disturbing the liquid level balance and causing inaccurate monitoring, preferably, the sealing cover 10 is equipped with an automatic air vent valve.

[0048] Specifically, the sealing cap 10 integrates an automatic air vent valve. When liquid 9 is added to the pipeline, the air released during daily use will naturally rise and collect at the top of the vertical pipe 5. After the gas accumulates, it can be discharged automatically through the automatic air vent valve. After the gas is discharged, the valve automatically closes and seals to prevent liquid 9 from leaking out. There is no need for staff to manually open the sealing cap 10 one by one to release air periodically, which prevents residual air bubbles from occupying the cavity space and disrupting the liquid level reference of the communicating vessel, continuously ensuring the detection accuracy of the liquid level sensor 6, and reducing the frequency of manual inspection and maintenance.

[0049] The automatic air vent valve is mounted on the upper end of the sealing cover 10, and a mechanical float-type miniature air vent standard component is selected. When setting it up, the air vent of the air vent valve should face outwards. It should be noted that an air vent valve compatible with the internal pressure specifications of the horizontal pipe 4 and the vertical pipe 5 should be selected.

[0050] In order to address the shortcomings of being unable to quickly locate the faulty lifting point after a fault alarm and the excessive time spent on on-site troubleshooting, preferably, the alarm module 8 includes several audible and visual alarms, each of which is set up one-to-one with several vertical pipes 5 and is only connected to the liquid level sensor 6 on the corresponding vertical pipe 5.

[0051] Specifically, the alarm module 8 is divided into multiple audible and visual alarms and is individually paired and wired to each vertical pipe 5. When the liquid level in a certain vertical pipe 5 is abnormal, only the corresponding alarm will activate the audible and visual prompt. Maintenance personnel can directly locate the corresponding lifting and hoisting mechanism 3 based on the location of the alarm sound, without having to check all the hoisting points in the entire greenhouse one by one, which greatly shortens the time for fault finding and downtime maintenance. The independent wiring design can also avoid a single point fault triggering an alarm throughout the entire greenhouse, reducing the production losses in the greenhouse caused by ineffective downtime.

[0052] The audible and visual alarm is a sub-component of alarm module 8, using 12V universal active audible and visual alarm components. During installation, it should be fixed nearby around the corresponding vertical pipe 5. It should be noted that each alarm has its own independent wiring and does not share signal lines. The alarms can be installed using either embedded or external mounting structures.

[0053] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A greenhouse lifting horizontal safety device applied to a liftable greenhouse which lifts a greenhouse roof by a plurality of lifting mechanisms, characterized in that, include: A horizontal pipe is fixedly installed on the roof of the liftable shed and arranged along the length of the roof. Several vertical pipes, the lower ends of which are connected to the horizontal pipe, together forming a communicating vessel structure, the communicating vessel being filled with liquid; the roof area corresponding to two adjacent lifting and hoisting mechanisms constitutes a hoisting and hoisting position, and each hoisting and hoisting position is provided with at least one vertical pipe at each end; A liquid level sensor is installed in each vertical pipe to match the number of vertical pipes. When the liquid level in the corresponding vertical pipe drops by a predetermined multiple of the limit allowable deformation of the roof component corresponding to the hoisting position, the liquid level sensor outputs a signal. The main control module is connected to all liquid level sensor signals and is used to control all lifting and hoisting mechanisms to stop and lock up after receiving a signal output by any liquid level sensor. An alarm module is connected to all liquid level sensors and is used to activate an alarm upon receiving a signal from any liquid level sensor.

2. The greenhouse lifting and leveling safety device according to claim 1, characterized in that: The canopy includes longitudinal beams and transverse beams; the horizontal pipes include longitudinal horizontal pipes and transverse horizontal pipes, which are respectively installed on the longitudinal beams and transverse beams, and are connected to form an integral connected pipeline surrounding the canopy.

3. The greenhouse lifting and leveling safety device according to claim 1, characterized in that: The vertical pipes are positioned directly opposite each other to the greenhouse hoisting points, and the central axis of the vertical pipes coincides with the vertical force centerline of the corresponding hoisting point.

4. The greenhouse lifting and leveling safety device according to claim 1, characterized in that: The preset multiple ranges from 0.5 to 0.

8.

5. The greenhouse lifting and leveling safety device according to claim 1, characterized in that: The liquid is an ethylene glycol-based antifreeze, and its freezing point is not higher than -25°C.

6. The greenhouse lifting and leveling safety device according to claim 5, characterized in that: The connection between the horizontal pipe and the vertical pipe is sealed with a sealing joint, and the entire communicating vessel structure is a closed structure.

7. The greenhouse lifting and leveling safety device according to claim 6, characterized in that: The top of the vertical pipe is equipped with a removable sealing cap.

8. The greenhouse lifting and leveling safety device according to claim 7, characterized in that: An automatic vent valve is provided on the sealing cover.

9. The greenhouse lifting and leveling safety device according to claim 1, characterized in that: The alarm module includes several audible and visual alarms, each of which is set up in a corresponding manner with several vertical pipes and is only connected to the liquid level sensor signal on the corresponding vertical pipe.

Images