Limiting sensor device and greenhouse quilt spreading system

Abstract

The invention relates to a limiting sensor device and a greenhouse cotton quilt spreading system, the limiting sensor device comprises a shell, a circuit board and a mercury switch; the shell is a hollow cuboid; the circuit board is arranged in the shell and located at the bottom of the shell; the mercury switch is arranged in the shell, the mercury switch is of a hollow columnar structure, and the mercury switch is longitudinally arranged on the circuit board; the mercury switch is internally provided with a mercury bead, the mercury bead can flow in the column length direction of the mercury switch, the bottom end of the mercury switch is suitable for being electrically connected with the circuit board through a wire, and the top end of the mercury switch extends upwards; the number of the mercury switches is more than two, any two adjacent mercury switches are connected in series, and the plurality of mercury switches are suitable for transmitting electric signals to the outside. The limiting sensor device has high sensitivity, and the on-off control of the switches can be realized under the condition that the mercury switches are inclined at a small angle, so that the rolling and spreading state of the current greenhouse quilt can be obtained more timely.

Description

Technical Field

[0001] This application relates to the technical field of greenhouse cotton quilt control, and particularly to a limit sensor device and a greenhouse cotton quilt unfolding system. Background Art

[0002] With the improvement of consumers' requirements for food safety and quality, the demand for organic green food is increasing continuously, which further promotes the development of greenhouse agriculture and drives the market demand for greenhouse cotton quilts. Currently, in the cotton quilt unfolding system, it is a common practice to use a limiter as a stop mechanism. By physical contact to trigger a change in a switching quantity, and then convert this change into an electrical signal and send it to the controller, and the controller controls the stop of the motor according to the received signal.

[0003] The existing greenhouse is composed of a shed film, an arc-shaped support and a rolling machine, and the lighting and heat preservation are regulated by cotton quilts in winter. To prevent the cotton quilt from being overly rolled to the bottom, a vertical pole type lower limit sensing device is adopted, which is fixed to the front edge of the bottom of the greenhouse with angle iron or steel pipe, and a spring sensor is installed on the top. When the cotton quilt touches the spring, the sensor cuts off the power supply of the rolling machine to prevent excessive rolling and unfolding. However, due to the telescopic displacement of the spring in the spring limiter, the service life is short due to metal fatigue, so that the limiter is prone to failure. And the current mercury sensor is prone to false triggering due to external interference, resulting in the cotton quilt unfolding system sending wrong instructions and affecting the rolling and unfolding efficiency of the greenhouse cotton quilt. Summary of the Invention

[0004] In view of this, this application proposes a limit sensor device and a greenhouse cotton quilt unfolding system.

[0005] According to one aspect of this application, a limit sensor device is provided, including: a housing, a circuit board and a mercury switch; The housing is a cuboid structure with a hollow interior; The circuit board is arranged inside the housing and is located at the bottom of the housing; The mercury switch is arranged inside the housing. The mercury switch is a hollow columnar structure, and the mercury switch is longitudinally arranged on the circuit board; There is a mercury bead inside the mercury switch. The mercury bead can flow along the column length direction of the mercury switch, and the bottom end of the mercury switch is electrically connected to the circuit board through a wire, and the top end of the mercury switch extends upward; The number of the mercury switches is two or more, and any two adjacent mercury switches are connected in series, and multiple mercury switches are suitable for transmitting electrical signals to the outside.

[0006] In a possible implementation, a plurality of the mercury switches are spaced apart in the housing. The mercury switches are columnar structures, and the plurality of mercury switches are arranged relatively parallel to each other.

[0007] In a possible implementation, the bottom end of the mercury switch has an electrical contact point. The electrical contact point is arranged at the center of the mercury switch, and one end of the electrical contact point is electrically connected to the circuit board through the wire, and the other end of the electrical contact point is adapted to be electrically connected to the mercury bead in the corresponding mercury switch.

[0008] In a possible implementation, it further includes: a limit block; the limit block is arranged inside the housing, and the limit block is sleeved on the mercury switch to limit the position of the mercury switch in the housing.

[0009] In a possible implementation, it further includes: a terminal; one end of the terminal is inserted on any side wall of the housing, and the terminal is electrically connected to the mercury switch. The other end of the terminal extends outward along the outer periphery of the housing and is adapted to transmit electrical signals to the outside.

[0010] In a possible implementation, the number of the mercury switches is two, and the two mercury switches are symmetrically arranged with respect to the midline of the terminal.

[0011] On the other hand, a rolling and spreading system for a greenhouse cotton quilt proposed in this application includes: a fixing plate and the above-mentioned limit sensor device; The fixing plate is a long strip structure and is adapted to be laid along the rolling and spreading direction of the greenhouse cotton quilt, and the fixing plate can be bent as the greenhouse cotton quilt is rolled up; one side end face of the fixing plate is adapted to be attached to the greenhouse cotton quilt, and the other side end face of the fixing plate is provided with the mercury switch; and the fixing plate and the circuit board are arranged opposite to each other on both sides of the corresponding mercury switch; The number of the limit sensor devices is two or more, and the plurality of limit sensor devices are spaced apart along the length direction of the fixing plate, and the top plates of the limit sensor devices are arranged close to the fixing plate; Specifically, when the greenhouse cotton quilt is in a spread state, two or more of the limit sensor devices are all in an off state, and when the greenhouse cotton quilt is in a rolled-up state, at least one of the limit sensor devices is in a connected state.

[0012] In a possible implementation, the plurality of limit sensor devices are connected in parallel.

[0013] In a possible implementation, the plurality of limit sensor devices are arranged parallel to each other on the fixing plate, and the limit sensor devices are installed in the same direction.

[0014] In a possible implementation, there are three of the limit sensor devices, and when the greenhouse cotton quilt is in a rolled-up state, the angular interval between any two adjacent limit sensor devices is 120 degrees.

[0015] Advantages of the present application: The limit sensor device of the present application has a simple structure, high sensitivity, and high integration. First, a mercury switch is provided in the limit sensor device of the present application. When the housing tilts and rotates, the mercury switch inside the housing will move to a special position, and then the mercury switch is electrically connected to the circuit board and the circuit board, and the circuit is in a closed state, so as to obtain the current rolling and unrolling state of the greenhouse cotton quilt. Specifically, since the mercury beads can flow in the columnar structure of the mercury switch, when the limit sensor rotates, the mercury beads fall to the bottom of the mercury switch. The mercury beads are electrically connected to the circuit board through a wire, so as to conduct with the circuit board and transmit an electrical signal to the outside. When the limit sensor rotates 180 degrees again, the mercury beads fall to the top of the mercury switch. Since the circuit board is located at the bottom of the housing, the mercury beads cannot conduct with the circuit board through the wire, so that the electrical signal cannot be transmitted to the outside. Furthermore, the position where the mercury switch structure is installed can be known from the electrical signal transmitted to the outside by the limit sensor. And compared with the traditional spring limit sensor, the limit sensor device of the present application will not have the situation of metal deformation. Therefore, the limit sensor device of the present application will not have the failure of the limiter and has higher sensitivity. At the same time, the limit sensor device of the present application is provided with more than two mercury switches, and a certain setting distance is maintained between these mercury switches. Adjacent mercury switches can be electrically connected, and then the two mercury bodies are connected in series by the circuit board at the lower part. If one of the mercury switches fails, the entire limit sensor device will not work, and at the same time, the safety of the limit sensor device can be ensured, and direct short-circuit of the internal circuit can be avoided.

[0016] The setting method of the rolling and spreading system of the greenhouse cotton quilt in this application is simple and more flexible. By installing the limit sensor devices at intervals in the length direction of the fixed plate, and then arranging the fixed plate around the greenhouse cotton quilt. When the greenhouse cotton quilt is laid flat, since the circuit board and the fixed plate are arranged on both sides of the mercury switch, furthermore, at this time, all the limit sensor devices on the fixed plate are in the off state and cannot transmit electrical signals to the outside. When the greenhouse cotton quilt is gradually rolled up, the mercury switch in the limit sensor device tilts, so that the mercury beads that were originally far from the circuit board gradually approach the circuit board until the mercury beads flow to the electrical contact points of the mercury switch, thereby making the mercury beads in the mercury switch conduct with the circuit board through the wire, and the mercury switch and the circuit board are in the closed state, transmitting electrical signals to the outside. That is, at this time, the circuit board is electrically connected to the circuit board, and the circuit board transmits the situation of the cotton quilt being rolled up at this time. And when the greenhouse cotton quilt is in the laid-flat state, the mercury switches in the multiple limit sensor devices are in the off state with the circuit board, and the mercury switch and the circuit board are in the off state, which can timely stop the laying-flat work of the cotton quilt circuit board.

[0017] Other features and aspects of this application will become clear from the following detailed description of the exemplary embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of this application together with the specification and are used to explain the principles of this application.

[0019] Figure 1 Internal schematic diagram of the limit sensor device showing an embodiment of this application; Figure 2 Schematic diagram of the housing of the limit sensor device showing an embodiment of this application; Figure 3 Closing diagram of the mercury switch showing an embodiment of this application; Figure 4 Rear view of the limit sensor device showing an embodiment of this application; Figure 5 Schematic structural diagram of the rolling and spreading system of the greenhouse cotton quilt showing an embodiment of this application; Figure 6 Schematic diagram of the principle of the rolling and spreading system of the greenhouse cotton quilt showing an embodiment of this application; Figure 7 Position relationship between the limit sensor device and the cotton quilt when the greenhouse cotton quilt is in the laid-flat state showing an embodiment of this application; Figure 8 Position relationship between the limit sensor device and the cotton quilt when the greenhouse cotton quilt is in the laid-flat state showing an embodiment of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the accompanying drawings. Like reference numerals in the drawings denote functionally identical or similar elements. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0021] Among them, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present application or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present application.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0023] The special term "exemplary" here means "serving as an example, embodiment, or illustration". Any embodiment described as "exemplary" here does not have to be construed as superior or better than other embodiments.

[0024] In addition, for a better description of the present application, numerous specific details are given in the following specific implementation manners. Those skilled in the art should understand that the present application can also be implemented without some specific details. In some instances, methods, means, elements, and circuits well-known to those skilled in the art are not described in detail to highlight the gist of the present application.

[0025] As Figures 1 - 4 shown, the limit sensor device includes: a housing 1, a circuit board 5, and a mercury switch 3; the housing 1 is a cuboid structure with a hollow interior; the circuit board 5 is arranged inside the housing 1 and at the bottom of the housing 1; the mercury switch 3 is arranged inside the housing 1, the mercury switch 3 is a hollow columnar structure, and the mercury switch 3 is longitudinally arranged on the circuit board 5; there is a mercury bead inside the mercury switch 3, the mercury bead can flow along the column length direction of the mercury switch 3, and the bottom end of the mercury switch 3 is electrically connected to the circuit board 5 through a wire, and the top end of the mercury switch 3 extends upward; the number of mercury switches 3 is two or more, and any two adjacent mercury switches 3 are connected in series, and multiple mercury switches 3 are adapted to transmit electrical signals to the outside.

[0026] The limit sensor device of this embodiment has a simple structure, high sensitivity, and high integration. First, a mercury switch 3 is arranged in the limit sensor device of this application. When the housing 1 tilts and rotates, the mercury switch 3 inside the housing 1 will move to a special position, and then the mercury switch 3 is electrically connected to the circuit board 5 and the circuit board 5, and the circuit is in a closed state, so as to obtain the current rolling and unrolling state of the greenhouse cotton quilt. Specifically, since the mercury beads can flow in the columnar structure of the mercury switch 3, when the limit sensor rotates, the mercury beads fall to the bottom of the mercury switch 3. The mercury beads are electrically connected to the circuit board 5 through a wire, so as to conduct with the circuit board 5 and transmit an electrical signal to the outside. When the limit sensor rotates 180 degrees again, the mercury beads fall to the top of the mercury switch 3. Since the circuit board 5 is located at the bottom of the housing 1, the mercury beads cannot conduct with the circuit board 5 through the wire, so they cannot transmit an electrical signal to the outside. Furthermore, the position of the structure with the mercury switch 3 installed is known through the electrical signal transmitted to the outside by the limit sensor. And compared with the traditional spring limit sensor, the limit sensor device of this application will not have the situation of metal deformation. Therefore, the limit sensor device of this application will not have the limiter malfunction and has higher sensitivity. At the same time, the limit sensor device of this application is provided with more than two mercury switches 3, and a certain setting distance is maintained between these mercury switches 3. Adjacent mercury switches 3 can be electrically connected, and then the lower circuit board 5 is used to connect the two mercury bodies in series. If one of the mercury switches 3 fails, the entire limit sensor device will not work, and at the same time, the safety of the limit sensor device can be ensured to avoid direct short-circuit of the internal circuit. It should be noted here that the circuit board 5 and the mercury switch 3 have a preset distance, and a setting distance is provided between any two adjacent mercury switches 3, which needs to be determined according to the actual tilting situation. The mercury switch 3 can make the circuit conduct or disconnect at a specific angle or position. It should also be noted that when one of the mercury switches 3 is misconnected due to external interference, the other mercury switches 3 can remain in a normal state, so as to avoid being electrically connected to the circuit board 5 and sending out wrong instructions.

[0027] In one specific embodiment, a plurality of mercury switches 3 are arranged at intervals in the housing 1. The mercury switch 3 has a columnar structure, and a plurality of mercury switches 3 are arranged relatively parallel to each other.

[0028] In one specific embodiment, the bottom end of the mercury switch 3 has an electrical contact point. The electrical contact point is arranged at the center of the mercury switch 3, and one end of the electrical contact point is electrically connected to the circuit board 5 through a wire, and the other end of the electrical contact point is suitable for being electrically connected to the mercury beads in the corresponding mercury switch 3. In this embodiment, it should be noted that preferably, a plurality of mercury switches 3 are arranged in a rectangular array, that is, the distance from the bottom end of the mercury switch 3 to the circuit board 5 is equal, and the top ends of the mercury switches 3 are flush.

[0029] In a possible implementation, the number of mercury switches 3 is two, and the two mercury switches 3 are symmetrically arranged about the midline of the terminal. In this embodiment, it should be noted that the number of mercury switches 3 is two, and the distances from the two mercury switches 3 to the terminal 2 are equal. Further, it should be noted that the distances from the two mercury switches 3 to the circuit board 5 are equal. This makes the limit sensor device more symmetric and balanced in structure. And the two mercury switches 3 are located at symmetric positions, which helps to reduce the detection error caused by position deviation. The symmetric layout also helps to improve the response consistency of the sensor in different directions and angles, thereby enhancing the overall performance stability of the limit sensor device.

[0030] In one specific embodiment, it further includes: a terminal 2; one end of the terminal 2 is inserted on any side wall of the housing 1, and the terminal 2 extends outward along the outer periphery of the housing 1 and is suitable for electrically connecting to the mercury switch 3. One end of the terminal 2 is electrically connected to the mercury switch, and the other end transmits an electrical signal to the outside through a splitter. In this embodiment, it should be noted that an installation hole is provided on the side wall of the housing 1 away from the circuit board 5, and the installation hole is located in the middle and lower part of the housing 1. The terminal 2 is fixedly connected to the housing 1 through the installation hole. Here, it should be noted that the housing 1 is surrounded by a top plate, a bottom plate 11 and four side plates. Among them, the bottom plate 11 is detachably connected to the other side plates. The mercury switch 3, the limit block, the circuit board 5 and the terminal 2 are installed in the housing 1, and then the bottom plate 11 is fixed to encapsulate the entire limit sensor device.

[0031] In one specific embodiment, it further includes: a limit block 5; the limit block 5 is arranged inside the housing 1, and the limit block 5 is sleeved on the mercury switch 3 to limit the position of the mercury switch 3 in the housing 1. Two through holes 51 corresponding to the mercury switch 3 are provided in the limit block 5, and the two through holes 51 match the size of the mercury switch 3, and the mercury switch 3 is correspondingly inserted into the through holes 51. Further, it should be noted that the mercury switch 3, the limit block 5 sleeved on the mercury switch 3 and the terminal 2 are oppositely arranged on both sides of the housing 1, which can keep the layout of the entire limit sensor device harmonious, and further keep the stability of the entire limit sensor device.

[0032] In the absence of the limit block 5, the mercury switch 3 may move excessively due to external impact or vibration, resulting in false triggering or damage. The presence of the limit block 5 effectively avoids this situation and protects the stability and reliability of the mercury switch 3. In some application scenarios, such as in automated equipment or industrial production lines, the limit sensor device needs to ensure that it can be triggered only at specific positions or angles. The presence of the limit block 5 prevents false triggering caused by misoperation or external interference, thereby improving the safety and reliability of the system. Furthermore, it should be noted that it also includes a plug 7, which is matched with the mounting hole. The plug 7 is inserted into the mounting hole to seal the housing 1. In this embodiment, it should be noted that a screw 4 is provided, and the screw 4 is a self-tapping screw 4 of M1.5. The gap between the wiring terminal 2 and the mounting hole can be directly sealed by sealant. The plug 7 is in close fit with the mounting hole. When the plug 7 is inserted and fastened in place, it can effectively seal the internal space of the housing 1, preventing the internal mercury or other media from leaking due to external pressure, temperature change, vibration and other factors. This sealing performance is crucial for maintaining the stability of the internal environment of the sensor and protecting the internal components from external contamination.

[0033] In one specific embodiment, the housing 1 is of a cuboid structure, and the corners of the housing 1 are rounded. This can prevent the corners of the housing 1 from bumping and hurting the user, improving the safety of the limit sensor device. Among them, Figure 1 the up and down direction of Figure 2 is the width direction of the housing 1, and Figure 2 the up and down direction of

[0034] is the height direction of the housing 1, and Figure 3 the left and right direction of

[0035] is the length direction of the housing 1. The width of the housing 1 is 20 cm, the length of the housing 1 is 22 cm, the height of the housing 1 is 24 cm, and the length of the wiring terminal 2 is 70 cm.

[0036]

[0034] As Figure 3 shown, in one specific embodiment, one end of the wiring terminal 2 is connected to the inside of the housing 1, and the other end is provided with a wire storage box 8, and a wire is arranged inside the wire storage. In this embodiment, it should be noted that a wire is arranged inside the wire storage box 8, and the wire can be electrically connected to the mercury switch 3, so that the controller is electrically connected to the limit sensor device.

[0035] The rolling and unrolling system of the greenhouse cotton quilt includes: a fixing plate 10 and the above-mentioned limit sensor device 20; the fixing plate 10 is of a long strip structure, suitable for being laid along the rolling and unrolling direction of the greenhouse cotton quilt, and the fixing plate 10 can be bent as the greenhouse cotton quilt is rolled up; one end face of the fixing plate 10 is suitable for being attached to the greenhouse cotton quilt, and a mercury switch is arranged on the other end face of the fixing plate 10; and the fixing plate 10 and the circuit board are arranged opposite to each other on both sides of the corresponding mercury switch; the number of the limit sensor devices 20 is two or more, and a plurality of limit sensor devices 20 are arranged at intervals along the length direction of the fixing plate 10, and the top plate of the limit sensor device 20 is arranged close to the fixing plate 10; specifically, when the greenhouse cotton quilt is in the unrolled state, two or more limit sensor devices 20 are all in the disconnected state, and when the greenhouse cotton quilt is in the rolled-up state, at least one limit sensor device 20 is in the connected state.

[0036] The greenhouse cotton quilt unfolding system proposed in this embodiment has a simple setting method and higher flexibility. By installing the limit sensor device 20 at intervals in the length direction of the fixed plate 10, and then surrounding the fixed plate 10 around the greenhouse cotton quilt. Thus, the state of the greenhouse cotton quilt can be sensed by the limit sensor device, and the cotton quilt can be controlled by the motor according to the state of the sensor.

[0037] Specifically, when the greenhouse cotton quilt is rolled up, the mercury switch 3 in the limit sensor device 20 is tilted, so that the mercury switch 3 is in a closed state with the controller, and the mercury switch 3 is in a closed state with the circuit board 5. That is, at this time, the circuit board 5 is electrically connected to the controller, and the circuit board 5 transmits the situation of the cotton quilt being rolled up at this time to the controller. And when the position of the mercury switch 3 in the limit sensor device 20 is tilted again, the mercury switch 3 is in an open state with the controller, and the mercury switch 3 is in an open state with the circuit board 5, which can timely stop the operation of the cotton quilt controller circuit board. Specifically, when the greenhouse cotton quilt is laid flat, since the circuit board 5 and the fixed plate 10 are arranged on both sides of the mercury switch 3 relatively, furthermore, at this time, all the limit sensor devices 20 on the fixed plate 10 are in an open state and cannot transmit electrical signals to the outside. When the greenhouse cotton quilt is gradually rolled up, the mercury switch 3 in the limit sensor device 20 is tilted, so that the mercury beads that were originally far from the circuit board 5 gradually approach the circuit board 5 until the mercury beads flow to the electrical contact points of the mercury switch 3, so that the mercury beads in the mercury switch 3 are conducted with the circuit board 5 through the wire, and the mercury switch 3 is in a closed state with the circuit board 5, transmitting electrical signals to the outside.

[0038] As Figure 5 and Figure 6 shown, in one specific embodiment, multiple limit sensor devices 20 are connected in parallel. In this embodiment, it should be noted that as long as one of the limit sensor devices 20 is in a connected state, the entire greenhouse cotton quilt unfolding system is in a connected state, and thus the rolling and unfolding state of the greenhouse cotton quilt can be judged in time.

[0039] In one specific embodiment, multiple limit sensor devices 20 are arranged in parallel with each other on the fixed plate 10, and the limit sensor devices 20 are installed in the same direction. In this embodiment, it should be noted that the limit sensor devices 20 installed in the same direction here means that the limit sensor devices 20 are arranged on the same plate surface of the fixed plate 10, so that when the greenhouse cotton quilt is rolled up, the other plate surface of the fixed plate 10 without the limit sensor devices 20 is more closely attached to the greenhouse cotton quilt, thereby accurately judging whether the greenhouse cotton quilt is in a rolled-up or flat state. Specifically, during the use process, the mercury switch 3 will move inside the limit sensor device 20 to achieve the disconnection or connection between the limit sensor device 20 and the controller. Moreover, the installation directions of the limit sensor devices 20 are the same, and the number of the limit sensor devices 20 is preferably three. When the greenhouse cotton quilt is in the rolled-up state, at least two mercury switches 3 inside the limit sensor devices 20 will move in a similar direction, thereby judging that the greenhouse cotton quilt is in the rolled-up state. When the greenhouse cotton quilt is fully spread out, the three limit sensor devices 20 are located on the same straight line, and the mercury switches 3 in the three limit sensor devices 20 are in the same position and are all disconnected, thereby judging that the greenhouse cotton quilt is in the spread-out state.

[0040] In one specific embodiment, the number of the limit sensor devices 20 is three. When the greenhouse cotton quilt is in the rolled-up state, the included angle between any two adjacent limit sensor devices 20 is 120 degrees. In this embodiment, it should be noted that the number of the limit sensor devices 20 is multiple, and a preset distance is set between the multiple limit sensor devices 20. In this application, it is preferred that the number of the limit sensor devices 20 is three. When the greenhouse cotton quilt is in the rolled-up state, the three limit sensor devices 20 are arranged at equal intervals in a ring on the outer periphery of the greenhouse cotton quilt, and preferably the included angle between any two adjacent limit sensor devices 20 with a preset distance therebetween is 120 degrees.

[0041] In one specific embodiment, it should be noted that a plurality of fixing boxes 30 are provided on the same side of the fixing plate 10, and the number of the fixing boxes 30 matches the number of the limit sensor devices 20, and the distance between any two adjacent fixing boxes 30 is equal. The fixing plate 10 is in a long strip structure, and a plurality of mounting holes are formed along the length direction of the plate surface of the fixing plate 10, so that the fixing plate 10 can be fixed by winding steel wires along the rolling and spreading direction of the greenhouse cotton quilt, and the fixing boxes 30 for installing the limit sensor devices 20 can also be fixed by winding steel wires along the length direction of the fixing plate 101. Further, it should be noted that the fixing plate 10 is made of a deformable material, which can be a metal material. Thus, the fixing plate 10 can be arranged in a ring shape along the rolling direction of the cotton quilt. During the rolling and spreading process of the greenhouse cotton quilt, the mercury switch 3 inside the limit sensor device 20 will move along with the rolling and spreading of the greenhouse cotton quilt, so as to judge the rolling and spreading situation of the greenhouse cotton quilt by obtaining the connection / disconnection relationship between the limit sensor device 20 and the external controller.

[0042] In one specific embodiment, it should be noted that the fixing plate 10 is arranged at one end of the rolling and spreading of the greenhouse cotton quilt, that is, the fixing plate 10 is arranged at the edge end of the greenhouse cotton quilt. Or the fixing plate 10 is arranged in the middle of the rolling and spreading of the greenhouse cotton quilt, and it is also possible to obtain whether the greenhouse cotton quilt is completely spread out.

[0043] Regarding the installation method of the fixing plate and the limit sensor device, as Figure 7 shown (1 limit sensor is shown in the figure, and the specific number can be more than 2). In a specific example, when the cotton quilt 002 is in a fully spread state, the mercury column of the limit sensor device 20 is perpendicular to the plane of the cotton quilt, and the limiter (limit sensor device) is in an energized state. When the cotton quilt is in a fully rolled state, as Figure 8 shown, the limiter rotates along with the cotton quilt, and the mercury in the internal mercury column is inclined, and the limiter is in a power-off state.

[0044] It should be noted that although the limit sensor device and the rolling and spreading system of the greenhouse cotton quilt are introduced above by taking this application as an example, those skilled in the art can understand that this application should not be limited thereto. In fact, users can flexibly set parameters according to their personal preferences and / or actual application scenarios as long as it is reasonable.

[0045] The above has described the embodiments of this application. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the actual application or the improvement of the technology in the market, or to enable other ordinary technicians in the technical field to understand the disclosed embodiments herein.

Claims

1. A limit sensor device, characterized in that, Including: A housing, a circuit board, and a mercury switch; the housing is a cuboid structure with a hollow interior; The circuit board is disposed inside the housing and at the bottom of the housing; The mercury switch is disposed inside the housing. The mercury switch is a hollow columnar structure and is longitudinally disposed on the circuit board; Inside the mercury switch is provided with a mercury bead. The mercury bead is flowable along the column length direction of the mercury switch. And the bottom end of the mercury switch is electrically connected to the circuit board through a wire, and the top end of the mercury switch extends upward; The number of the mercury switches is two or more, and any two adjacent mercury switches are connected in series, and multiple mercury switches are adapted to transmit electrical signals to the outside.

2. The limit sensor device according to claim 1, wherein Multiple mercury switches are spaced apart inside the housing. The mercury switch is a columnar structure, and multiple mercury switches are arranged relatively parallel.

3. The limit sensor device according to claim 1, characterized in that The bottom end of the mercury switch has an electrical contact point. The electrical contact point is disposed at the center of the mercury switch, and one end of the electrical contact point is electrically connected to the circuit board through the wire, and the other end of the electrical contact point is adapted to be electrically connected to the mercury bead inside the corresponding mercury switch.

4. The limit sensor device according to claim 1, wherein, Further including: A limit block; The limit block is disposed inside the housing, and the limit block is sleeved on the mercury switch to limit the position of the mercury switch inside the housing.

5. The limit sensor device according to claim 1, characterized in that, Further including: A wiring head; One end of the wiring head is inserted into any side wall of the housing, and the wiring head is electrically connected to the mercury switch. The other end of the wiring head extends outward along the outer periphery of the housing and is adapted to transmit electrical signals to the outside.

6. The limit sensor device according to claim 5, characterized in that, The number of the mercury switches is two, and the two mercury switches are symmetrically arranged with respect to the midline of the wiring head.

7. A rolling and laying system for greenhouse quilts, characterized in that, Including: A fixing plate and the limit sensor device according to any one of claims 1-6; The fixing plate is a long strip structure and is adapted to be laid along the rolling and unrolling direction of the greenhouse cotton quilt, and the fixing plate can be bent as the greenhouse cotton quilt is rolled up; One side end face of the fixing plate is adapted to be attached to the greenhouse cotton quilt, and the other side end face of the fixing plate is provided with the mercury switch; and the fixing plate and the circuit board are relatively arranged on both sides of the corresponding mercury switch; The number of the limit sensor devices is two or more, and multiple limit sensor devices are spaced apart along the length direction of the fixing plate; Specifically, when the greenhouse cotton quilt is in the unrolled state, two or more of the limit sensor devices are in the disconnected state, and when the greenhouse cotton quilt is in the rolled-up state, at least one of the limit sensor devices is in the connected state.

8. The rolling and unrolling system of the greenhouse cotton quilt according to claim 7, characterized in that Multiple limit sensor devices are connected in parallel.

9. The rolling and laying system of the greenhouse cotton quilt according to claim 7, wherein Multiple limit sensor devices are arranged parallel to each other on the fixing plate, and the limit sensor devices are installed in the same direction.

10. The rolling and spreading system of the greenhouse cotton quilt according to claim 7, characterized in that, The number of the limit sensor devices is three, and when the greenhouse cotton quilt is in the rolled-up state, the included angle between any two adjacent limit sensor devices is 120 degrees.

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