Suspension guide rail type roller shutter device for sunlight greenhouse
By designing a roller shutter device for a sunlight greenhouse, the load-bearing guide rail and suspension walking mechanism are used to reduce the load of the steel frame, and the reel and insulation quilt are lifted through the lifting components and height adjustment components, the problem of the inability to unfold and safety hazards of the existing technology of covers and foreign countries is solved, and a safer and more stable roller shutter process is achieved.
Patent Information
- Application Number
- CN202420645050.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-03-29
AI Technical Summary
When the existing solar greenhouse roller shutter is used in winter, the outer covering cannot be effectively deployed, and there are safety hazards during operation, which can easily lead to the deformation of the steel frame and the risk of crushing the greenhouse.
A suspension guide rail-type roller shutter device for solar greenhouse is designed. Through the combination of load-bearing guide rail, suspended walking mechanism, movable load-bearing mechanism, drive mechanism and roller shutter mechanism, the roller shutter mechanism moves along the guide rail, reduces the load of the steel frame, and lifts the reel and insulation cushion through the lifting component and the height adjustment component to avoid gravity load acting directly on the steel frame.
It effectively reduces the gravity load borne by the steel frame, improves the safety and stability of the roller shutter process, avoids the risk of steel frame deformation and crushing the greenhouse, and adapts to insulation quilts of different thicknesses.
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Figure CN222655875U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of machinery for solar greenhouses, in particular to a roller curtain device for a suspended guide rail solar greenhouse. Technical Background
[0002] In the cold winter, straw thatch or quilt is used as insulation cover in solar greenhouse production. Traditionally, it is mostly done manually, which is labor-intensive, time-consuming and labor-intensive, and has low production efficiency, which is a major problem that plagues winter production in solar greenhouses. The emergence of roller shutters replaces manual operation, prolongs the lighting time, increases photosynthesis, and more importantly, saves labor time and reduces labor intensity. It is the most important agricultural machinery in solar greenhouses.
[0003] The main types of roller shutters currently available include rear-mounted rope pull-up type, front-mounted reel push-up type, and side-mounted reel push-up type. Among them, the rear-mounted rope pull-up type is affected by the slope of the front arc surface of the greenhouse. If the slope is too gentle, the outer covering cannot be unfolded. In addition, the tightness of the pull rope needs to be adjusted in time during operation. The exposed dangerous points cover the entire greenhouse roof. Comprehensive safety protection is difficult and can easily cause safety accidents. The swing rod connection of the front-mounted reel push-up roller shutter machine is prone to breakage, causing accidents and uneven rolling. The output torque of the side-mounted reel push-up roller shutter machine is unbalanced, the roller shutter on the other side of the roller shutter machine host is not in place, and the reel near the host side often breaks.
[0004] In order to solve the above technical problems, the Chinese utility model patent with application number CN201420373166.3 announced a track-type solar greenhouse rolling device, which includes a guide rail, a motor seat upper swing rod, a motor seat lower swing rod, a roller, a reel, a front support rod, and a rear support rod. The roller of the mechanism drives the reel to roll up and spread the outer insulation covering by walking along the track installed above the solar greenhouse frame. The weight of the roller is borne by the guide rail, which can reduce the load of the solar greenhouse frame. The motor walks along the guide rail, the rolling insulation blanket has good stability, the reel is straight, and the rolling process is safe and reliable.
[0005] However, the above-mentioned prior art still has the following technical problems: the upper swing rod and the lower swing rod of the rolling shutter machine base are connected by bolts to form a set of hinges, that is, the upper swing rod and the lower swing rod of the rolling shutter machine base can rotate relative to each other; as the rolling shutter machine runs, most of the gravity load of the rolling shutter machine's rolling shutter shaft and the wound insulation quilt still directly acts on the steel frame of the solar greenhouse, and there is also a risk of deformation of the steel frame and crushing the greenhouse. Utility Model Content
[0006] In view of this, it is necessary to provide a roller shutter device for a suspended rail type solar greenhouse that reduces the gravity load borne by the steel frame.
[0007] A roller shutter device for a suspended rail-type solar greenhouse, comprising: a load-bearing rail, a suspension travel mechanism, a movable bearing mechanism, a driving mechanism and a roller shutter mechanism, wherein one end of the load-bearing rail is fixed to the ground of the solar greenhouse, and the other end is fixed to the solar greenhouse, and its curvature is the same as the curvature of the light-receiving surface of the solar greenhouse, and is fixedly installed above the solar greenhouse to carry the suspension travel mechanism, the movable bearing mechanism, the driving mechanism, and the roller shutter mechanism; the suspension travel mechanism comprises a first suspension travel wheel, a second suspension travel wheel, a suspension travel wheel mounting frame, a suspension frame, a lifting assembly and a height adjustment assembly, the upper front end of the suspension travel wheel mounting frame is rotatably mounted with the first suspension travel wheel, and the upper rear end is rotatably mounted with the second suspension travel wheel The walking wheel, the first suspended walking wheel and the second suspended walking wheel are all slidably hung on the load-bearing guide rail for moving along the load-bearing guide rail; the lower rear end of the suspended walking wheel mounting frame is rotatably mounted with a hanging frame, and the lower front end is fixedly mounted with a height adjustment component; one end of the pulling component is rotatably mounted on the hanging frame, and the other end is rotatably mounted on the height adjustment component; the movable carrying mechanism is mounted on the hanging frame and can move on the hanging frame; the rolling curtain mechanism is rotatably mounted on the movable carrying mechanism; the driving mechanism is fixedly mounted on the movable carrying mechanism to drive the rolling curtain mechanism to rotate and roll up the thermal insulation quilt and pull the movable carrying mechanism and the suspended walking mechanism to move the rolling curtain along the load-bearing guide rail.
[0008] Preferably, the load-bearing guide rail is a triangular structure composed of three steel beams, and the first suspension running wheel and the second suspension running wheel are both hung on the uppermost steel beam.
[0009] Preferably, the suspended walking wheel mounting frame includes a frame, a first suspended walking wheel mounting arm, a second suspended walking wheel mounting arm, a suspension frame mounting arm and a height adjustment component mounting arm, the frame is a rectangular steel frame, the front end of the frame is fixedly mounted with the first suspended walking wheel mounting arm to mount the first suspended walking wheel, the rear end of the frame is fixedly mounted with the second suspended walking wheel mounting arm to mount the second suspended walking wheel, the first suspended walking wheel mounting arm and the second suspended walking wheel mounting arm are on the same side; the suspension frame mounting arm is fixedly mounted at the rear end of the frame, in the opposite direction to the second suspended walking wheel mounting arm, so as to rotatably mount the suspension frame; the height adjustment component mounting arm is mounted at the front end of the frame, in the opposite direction to the first suspended walking wheel mounting arm, so as to fixedly mount the height adjustment component.
[0010] Preferably, the movable supporting mechanism includes a driving mechanism supporting frame, a first upper walking wheel mounting frame, a second upper walking wheel mounting frame, a first upper walking wheel, a second upper walking wheel, a side limiting wheel and a rolling mechanism mounting seat, the driving mechanism supporting frame is a rectangular steel frame, and two parallel steel beams are fixed in the middle to fix the driving mechanism; the first upper walking wheel mounting frame and the second upper walking wheel mounting frame are fixedly mounted above two opposite side frames of the driving mechanism supporting frame and are located on the same side; the first upper walking wheel is rotatably mounted on the first upper walking wheel mounting frame, and the second upper walking wheel is rotatably mounted on the second upper walking wheel mounting frame to move on the suspension frame; the side limiting wheel is rotatably mounted on the side frame of the driving mechanism supporting frame, and is in the same line as the first upper walking wheel mounting frame and the second upper walking wheel mounting frame, so as to limit the driving mechanism supporting frame within the suspension frame and not rub against the suspension frame; the rolling mechanism mounting seat is fixedly mounted below the driving mechanism supporting frame.
[0011] Preferably, the rolling shutter mechanism comprises a reel and a transmission assembly, the reel is rotatably mounted on a rolling shutter mechanism mounting seat, and the transmission assembly is fixedly mounted on the reel, so that the transmission assembly is driven by a driving mechanism to drive the reel to rotate and roll up the thermal insulation quilt.
[0012] Preferably, the lifting component is a spring.
[0013] Preferably, the height adjustment assembly includes a height adjustment fixed arm and a height adjustment telescopic arm, and the height adjustment fixed arm is fixedly mounted on the height adjustment assembly mounting arm; one end of the height adjustment telescopic arm is rotatably mounted on the lifting assembly, and the other end of the height adjustment telescopic arm can be movably connected to the height adjustment fixed arm through a pin connection position.
[0014] In the above-mentioned hanging guide rail type roller shutter device for solar greenhouse, the driving mechanism drives the reel through the transmission component to drive the reel to roll up the thermal insulation quilt and the thermal insulation quilt is pulled upward along the load-bearing guide rail. During this process, the gravity load of the reel and the wound thermal insulation quilt is borne entirely by the load-bearing guide rail. The lifting component provides an upward pulling force to lift the reel and the wound thermal insulation quilt, thereby avoiding the gravity load of the reel and the wound thermal insulation quilt from directly acting on the steel frame of the solar greenhouse; the height adjustment component can adjust the distance between the center of the reel and the greenhouse film; this not only effectively avoids the reel and the wound thermal insulation quilt from pressing the steel frame of the solar greenhouse, causing the steel frame to deform or even crush the solar greenhouse, but can also adapt to thermal insulation quilts of different thicknesses. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is an axial schematic diagram of a roller shutter device for a suspended rail-type solar greenhouse.
[0016] Figure 2It is a schematic diagram of the structure of a roller shutter device for a suspended rail-type solar greenhouse.
[0017] Figure 3 It is a structural diagram of the suspension walking mechanism.
[0018] Figure 4 It is a structural schematic diagram of the suspension travel wheel mounting frame.
[0019] Figure 5 It is a structural schematic diagram of a movable carrying mechanism.
[0020] Figure 6 It is a schematic diagram of the structure of the lifting component and the height adjustment component.
[0021] In the figure: a roller shutter device 10 for a suspended rail-type solar greenhouse, a load-bearing rail 11, a suspended walking mechanism 12, a first suspended walking wheel 121, a second suspended walking wheel 122, a suspended walking wheel mounting frame 123, a frame 1231, a first suspended walking wheel mounting arm 1232, a second suspended walking wheel mounting arm 1233, a suspension frame mounting arm 1234, a height adjustment component mounting arm 1235, a suspension frame 124, a lifting component 125, a height adjustment component 126, a height adjustment fixed arm 1261, a height adjustment telescopic arm 1262, a movable bearing mechanism 13, a driving mechanism bearing frame 131, a first upper walking wheel mounting frame 132, a second upper walking wheel mounting frame 133, a first upper walking wheel 134, a second upper walking wheel 135, a side limiting wheel 136, a roller shutter mechanism mounting seat 137, a driving mechanism 14, a roller shutter mechanism 15, a reel 151, and a transmission assembly 152. DETAILED DESCRIPTION
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0023] Please see Figure 1 and Figure 2The present application provides a roller shutter device 10 for a suspended guide rail solar greenhouse, comprising: a load-bearing guide rail 11, a suspended walking mechanism 12, a movable bearing mechanism 13, a driving mechanism 14 and a roller shutter mechanism 15. The load-bearing guide rail 11 has the same curvature as the light-receiving surface of the solar greenhouse and is fixedly installed above the solar greenhouse to bear the weight of the suspended walking mechanism 12, the movable bearing mechanism 113, the driving mechanism 14, the roller shutter mechanism 15 and the rolled-up thermal insulation quilt; the suspended walking mechanism 12 comprises a first suspended walking wheel 121, a second suspended walking wheel 122, a suspended walking wheel mounting frame 123, a hanging frame 124, a lifting assembly 125 and a height adjustment assembly 126, the upper front end of the suspended walking wheel mounting frame 123 is rotatably mounted with the first suspended walking wheel 121, the upper rear end is rotatably mounted with the second suspended walking wheel 122, the first The suspension running wheel 121 and the second suspension running wheel 122 are both slidably hung on the load-bearing guide rail 11 for moving along the load-bearing guide rail 11; the lower rear end of the suspension running wheel mounting frame 123 is rotatably mounted with a suspension frame 124, and the lower front end is fixedly mounted with a height adjustment component 126; one end of the lifting component 125 is rotatably mounted on the suspension frame 124, and the other end is rotatably mounted on the height adjustment component 126; the movable supporting mechanism 13 is mounted on the suspension frame 124 and can move on the suspension frame 124; the rolling curtain mechanism 15 is rotatably mounted on the movable supporting mechanism 13; the driving mechanism 14 is fixedly mounted on the movable supporting mechanism 13 to drive the rolling curtain mechanism 15 to rotate and roll up the thermal insulation quilt and pull the movable supporting mechanism 13 and the suspension running mechanism 12 to move the rolling curtain along the load-bearing guide rail 11.
[0024] Furthermore, the load-bearing guide rail 11 is a triangular structure composed of three steel beams to enhance the strength and stability of the load-bearing guide rail 11 and prevent the suspension running mechanism 12 from shaking during the rolling process; the first suspension running wheel 121 and the second suspension running wheel 122 are both hung on the topmost steel beam.
[0025] For further information, see Figure 4The suspension wheel mounting frame 123 includes a frame 1231, a first suspension wheel mounting arm 1232, a second suspension wheel mounting arm 1233, a suspension frame mounting arm 1234 and a height adjustment component mounting arm 1235. The frame 1231 is a rectangular steel frame. The first suspension wheel mounting arm 1232 is fixedly mounted on the front end of the frame 1231 to mount the first suspension wheel 121. The second suspension wheel mounting arm 1233 is fixedly mounted on the rear end of the frame 1231 to mount the second suspension wheel 122. The first suspension wheel mounting arm 1232 and the second suspension wheel mounting arm 1233 are on the same side. The suspension frame mounting arm 1234 is fixedly mounted on the rear end of the frame 1231, in the opposite direction to the second suspension wheel mounting arm 1233, so as to rotatably mount the suspension frame 124. The height adjustment component mounting arm 1235 is mounted on the front end of the frame 1231, in the opposite direction to the first suspension wheel mounting arm 1232, so as to fix the height adjustment component 126.
[0026] Further, please refer to Figure 5, the movable carrying mechanism 13 includes a driving mechanism carrying frame 131, a first upper walking wheel mounting frame 132, a second upper walking wheel mounting frame 133, a first upper walking wheel 134, a second upper walking wheel 135, a side limiting wheel 136 and a rolling mechanism mounting seat 137, the driving mechanism carrying frame 131 is a rectangular steel frame, and two parallel steel beams are fixed in the middle to fix the driving mechanism 14; the first upper walking wheel mounting frame 132 and the second upper walking wheel mounting frame 133 are fixedly mounted above the two opposite side frames of the driving mechanism carrying frame 131, and are located on the same side; the first upper walking wheel 134 is rotatably mounted on the first upper walking wheel mounting frame 132, and the second upper walking wheel 135 is rotatably mounted on the second upper walking wheel mounting frame The side limiting wheel 136 is rotatably mounted on the side frame of the driving mechanism carrier frame, and is in the same straight line with the first upper walking wheel mounting frame 132 and the second upper walking wheel mounting frame 133, so as to limit the driving mechanism carrier frame 131 in the suspension frame 124 without friction with the suspension frame 124; the rolling shutter mechanism mounting seat 137 is fixedly mounted below the driving mechanism carrier frame 131; after the driving mechanism 14 is started to roll up the shutter, the movable bearing mechanism 13 is first moved from the rear end to the front end of the suspension frame 124 due to the traction of the insulation quilt, and then drives the entire suspension walking mechanism 12 to move the shutter along the load-bearing guide rail 11, thereby avoiding the situation that the insulation quilt at the front end of the solar greenhouse cannot be covered due to the influence of the suspension frame 124.
[0027] For further information, see Figure 2The rolling shutter mechanism 15 includes a reel 151 and a transmission assembly 152. The reel 151 is rotatably mounted on the rolling shutter mechanism mounting seat 137, and the transmission assembly 152 is fixedly mounted on the reel 151, so that the transmission assembly 152 is driven by the driving mechanism 14 to drive the reel 151 to rotate and roll up the thermal insulation quilt.
[0028] For further information, see Figure 6 The lifting component 125 is a spring, and the lifting component 125 provides an upward pulling force to lift the rolling shutter mechanism 15 which becomes heavier as the rolling shutter progresses, to prevent the insulation blanket from being squeezed on the steel beam of the solar greenhouse due to the increase in the radius of the insulation blanket rolled up by the reel 151.
[0029] For further information, see Figure 6 The height adjustment component 126 includes a height adjustment fixed arm 1261 and a height adjustment telescopic arm 1262, and the height adjustment fixed arm 1261 is fixedly mounted on the height adjustment component mounting arm 1235; one end of the height adjustment telescopic arm 1262 is rotatably mounted on the lifting component 125, and the other end of the height adjustment telescopic arm 1262 is movably connected to the height adjustment fixed arm 1261 through an adjustable pin connection position, so as to adjust the vertical distance between the center of the reel 151 and the greenhouse film by inserting the length of the height adjustment telescopic arm 1262 into the height adjustment fixed arm 1261, so as to adapt to thermal insulation blankets of different thicknesses and prevent the thermal insulation blanket from being squeezed on the steel beam of the solar greenhouse due to the different thicknesses of the thermal insulation blankets, resulting in the radius of the thermal insulation blanket rolled up by the reel 151 exceeding the vertical distance between the center of the reel 151 and the greenhouse film.
[0030] When implementing this utility model, please refer to Figure 1 and Figure 2 The driving mechanism 14 drives the reel 151 to rotate and roll up the thermal insulation blanket through the transmission assembly 152, and the thermal insulation blanket pulls the reel 151 to move upward, and the reel 151 drives the movable bearing mechanism 13 to move along the suspension frame 124. After the movable bearing frame 13 is pulled to the top of the suspension frame 124, it drives the suspension walking mechanism 12 to move the rolling curtain upward along the load-bearing guide rail 11; during the rolling curtain process, the lifting assembly 125 provides an upward pulling force to lift the rolling curtain mechanism 15 which becomes heavier as the curtain is rolled up, so as to prevent the rolling curtain from being pulled up. To prevent the insulation quilt from being squeezed on the steel beam of the solar greenhouse due to the increase in the radius of the insulation quilt rolled up by the reel 151, the vertical distance between the center of the reel 151 and the greenhouse film can be adjusted by inserting the length of the height adjustment telescopic arm 1262 in the height adjustment fixed arm 1261 to adapt to insulation quilts of different thicknesses and prevent the insulation quilt from being squeezed on the steel beam of the solar greenhouse due to the radius of the insulation quilt rolled up by the reel 151 exceeding the vertical distance between the center of the reel 151 and the greenhouse film.
[0031] The modules or units in the device of the embodiment of the utility model can be combined, divided and deleted according to actual needs. The above disclosure is only the preferred embodiment of the utility model, and of course it cannot be used to limit the scope of the rights of the utility model. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments are implemented, and equivalent changes made according to the claims of the utility model still fall within the scope of the utility model.
Claims
1. A roller shutter device for a suspended rail-type solar greenhouse, characterized in that include: A load-bearing guide rail, a suspension walking mechanism, a movable bearing mechanism, a driving mechanism and a rolling shutter mechanism. One end of the load-bearing guide rail is fixed to the ground of the solar greenhouse, and the other end is fixed to the solar greenhouse. Its curvature is the same as the curvature of the light-receiving surface of the solar greenhouse. It is fixedly installed above the solar greenhouse to carry the suspension walking mechanism, the movable bearing mechanism, the driving mechanism, and the rolling shutter mechanism; the suspension walking mechanism includes a first suspension walking wheel, a second suspension walking wheel, a suspension walking wheel mounting frame, a suspension frame, a lifting assembly and a height adjustment assembly. The upper front end of the suspension walking wheel mounting frame is rotatably installed with the first suspension walking wheel, and the upper rear end is rotatably installed with the second suspension walking wheel. The first suspension walking wheel The first and second suspension wheels are slidably hung on the load-bearing guide rail for moving along the load-bearing guide rail; the lower rear end of the suspension wheel mounting frame is rotatably mounted with a suspension frame, and the lower front end is fixedly mounted with a height adjustment assembly; one end of the lifting assembly is rotatably mounted on the suspension frame, and the other end is rotatably mounted on the height adjustment assembly; the movable carrying mechanism is mounted on the suspension frame and can move on the suspension frame; the rolling curtain mechanism is rotatably mounted on the movable carrying mechanism; the driving mechanism is fixedly mounted on the movable carrying mechanism to drive the rolling curtain mechanism to rotate and roll up the thermal insulation quilt and pull the movable carrying mechanism and the suspension traveling mechanism to move the rolling curtain along the load-bearing guide rail.
2. The roller blind device for a suspended rail-type solar greenhouse according to claim 1, characterized in that: The load-bearing guide rail is a triangular structure composed of three steel beams, and the first suspension running wheel and the second suspension running wheel are both hung on the uppermost steel beam.
3. The roller blind device for a suspended rail-type solar greenhouse according to claim 1, characterized in that: The suspended walking wheel mounting frame includes a frame, a first suspended walking wheel mounting arm, a second suspended walking wheel mounting arm, a suspension frame mounting arm and a height adjustment component mounting arm. The frame is a rectangular steel frame. The first suspended walking wheel mounting arm is fixedly mounted on the front end of the frame to mount the first suspended walking wheel, and the second suspended walking wheel mounting arm is fixedly mounted on the rear end of the frame to mount the second suspended walking wheel. The first suspended walking wheel mounting arm and the second suspended walking wheel mounting arm are on the same side; the suspension frame mounting arm is fixedly mounted at the rear end of the frame, in the opposite direction to the second suspended walking wheel mounting arm, so as to rotatably mount the suspension frame; the height adjustment component mounting arm is mounted at the front end of the frame, in the opposite direction to the first suspended walking wheel mounting arm, so as to fixedly mount the height adjustment component.
4. The roller blind device for a suspended rail-type solar greenhouse according to claim 1, characterized in that: The movable carrying mechanism includes a driving mechanism carrying frame, a first upper walking wheel mounting frame, a second upper walking wheel mounting frame, a first upper walking wheel, a second upper walking wheel, a side limiting wheel and a rolling mechanism mounting seat, the driving mechanism carrying frame is a rectangular steel frame, and two parallel steel beams are fixed in the middle to fix the driving mechanism; the first upper walking wheel mounting frame and the second upper walking wheel mounting frame are fixedly mounted on two opposite side frames of the driving mechanism carrying frame and are located on the same side; the first upper walking wheel is rotatably mounted on the first upper walking wheel mounting frame, and the second upper walking wheel is rotatably mounted on the second upper walking wheel mounting frame to move on the suspension frame; the side limiting wheel is rotatably mounted on the side frame of the driving mechanism carrying frame, and is in the same line as the first upper walking wheel mounting frame and the second upper walking wheel mounting frame, so as to limit the driving mechanism carrying frame within the suspension frame and not rub against the suspension frame; the rolling mechanism mounting seat is fixedly mounted below the side frame of the driving mechanism carrying frame.
5. The roller blind device for a suspended rail-type solar greenhouse according to claim 1, characterized in that: The rolling shutter mechanism comprises a reel and a transmission assembly. The reel is rotatably mounted on a mounting seat of the rolling shutter mechanism, and the transmission assembly is fixedly mounted on the reel, so that the transmission assembly is driven by a driving mechanism to drive the reel to rotate and roll up the thermal insulation quilt.
6. The roller blind device for a suspended rail-type solar greenhouse according to claim 1, characterized in that: The lifting component is a spring.
7. The roller blind device for a suspended rail-type solar greenhouse according to claim 1, characterized in that: The height adjustment assembly includes a height adjustment fixed arm and a height adjustment telescopic arm, wherein the height adjustment fixed arm is fixedly mounted on the height adjustment assembly mounting arm; one end of the height adjustment telescopic arm is rotatably mounted on the lifting assembly, and the other end of the height adjustment telescopic arm is movably connected to the height adjustment fixed arm via a pin connection position.
Citation Information
Patent Citations
Track type sunlight greenhouse rolling-up and rolling-out mechanism
CN203912752U
Cited By
Suspension guide rail type roller shutter device for super-long sunlight greenhouse
CN118020538A