Actuator material and greenhouse roller shutter machine positioning mechanism using the same

Abstract

The application belongs to the field of new materials, and particularly relates to an actuator material with thermal deformation characteristics and a greenhouse roller shutter machine positioning mechanism using the actuator material. The actuator material is made of copper foil and a plurality of active layers and passive layers which are laminated and hot-pressed to form a composite. The greenhouse roller shutter machine positioning mechanism comprises a plurality of front positioning structures. Each front positioning structure comprises a fixed rod and a front positioning hook matched with the fixed rod. The material of the front positioning hook is the actuator material. The front positioning hook is connected with a reset support rod. The reset support rod is slidingly connected with a support barrel. A reset spring is arranged in the support barrel and between the closed end of the reset support rod and the support barrel. The application provides a safe and reliable greenhouse roller shutter machine positioning mechanism which can avoid the top of the roller shutter from being pulled too hard.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of new materials, and relates to an actuator material with thermal deformation characteristics, and a greenhouse roller shutter machine positioning mechanism using the actuator material. BACKGROUND

[0002] Intelligent actuators can convert external energy into mechanical deformation under different forms of external stimuli (such as temperature, light, electric field, magnetic field, solution), and have great potential in the fields of industry, medicine, sensing, etc. Thermal actuators can be driven by light, electricity, etc. based on temperature difference as a driving source. The existing thermal response bimetallic strip actuator is a multilayer structure composite material composed of two or more metal materials, and when the ambient temperature changes, the multilayer structure will bend and deform due to the difference in thermal expansion coefficients between the layers. However, the multilayer structure of the bimetallic strip is combined by welding, and in the service process, the multilayer structure is prone to not fit tightly, even to be detached, which causes the bimetallic strip to deflect out of position and produces non-recoverable bending.

[0003] Based on the above problems, the present application provides a fiber-reinforced composite actuator using non-metallic fibers as reinforcing bodies and polymers as matrices, and designs a greenhouse roller shutter mechanism using the actuator material. Common greenhouse roller shutter machines have two types of rear wall fixed type and canopy self-moving type: the canopy self-moving type greenhouse roller shutter machine is driven by a drive to rotate a roller rod, which drives the roller shutter on the greenhouse; driving the roller rod to rotate forward or reverse can make the roller shutter roll up or unroll. When the roller shutter is rolled up to the top of the greenhouse, the drive can be controlled to be powered off by the limit switch at the top of the greenhouse, so that the drive and the roller shutter are stopped at the top of the greenhouse; at this time, the greenhouse roller shutter machine mainly limits the downward sliding of the roller shutter through the brake of the drive and the tension at the top of the roller shutter. Long-term wear of the brake of the drive will cause the roller shutter to slide downward after rolling up, and the wear of the brake is not easy to be found, which has safety hazards. At the same time, the weight of the greenhouse roller shutter machine and the rolled-up roller shutter is large, and the pulling at the top of the roller shutter will also aggravate the wear at the top of the roller shutter. The actuator material is used to limit the rolled-up roller shutter, which is beneficial to improve the service life of the brake of the greenhouse roller shutter, and is easy to realize unrolling. SUMMARY

[0004] The present application aims to provide an actuator material, and a greenhouse roller shutter machine positioning mechanism prepared using the actuator material, which can avoid the top of the roller shutter being pulled too hard.

[0005] Based on the above purpose, the present application adopts the following technical scheme:

[0006] First aspect:

[0007] An actuator material, comprising an active layer, a passive layer and a copper foil, the actuator material comprising at least one copper foil layer and a plurality of polymer layers, a plurality of fiber layers, the polymer layers and the fiber layers being alternately spread, the copper foil being interlayered between any two layers or being arranged at the uppermost layer or the lowermost layer; the active layer being a polymer layer, the passive layer being an oriented fiber layer, and the layers being combined by hot pressing.

[0008] The non-metallic fiber layer is selected from one or more of carbon fiber, glass fiber, basalt fiber, ultra-high molecular weight polyethylene fiber, polyimide fiber, polyester, and silk; and the polymer layer material is selected from one or more of polyether ether ketone, polycarbonate, polyamide, polyphenylene sulfide, polyimide, polyformaldehyde, urea-formaldehyde resin, melamine resin, and epoxy resin.

[0009] The thickness of the fiber layer is 50-1000 μm, preferably 100-500 μm; the thickness of the polymer layer is 30-1000 μm, preferably 50-500 μm; the number of layers of the polymer layer and the fiber layer is the same, each having 4-6 layers. The layering method uses multi-layer composite alternating stack spreading. Taking the example of 4 layers of polymer layer and fiber layer, the copper foil can be arranged at the bottom layer, the first layer on the copper foil being a fiber layer, the second layer being a polymer layer, the third layer being a fiber layer, and the fourth layer being a polymer layer, and the layers are alternately spread in the same manner to eight layers. In addition, the copper foil can also be interlayered between the polymer layer and the fiber layer, or arranged at the uppermost layer.

[0010] Further, the hot pressing process is as follows: the copper foil, the polymer layer, and the fiber layer are stacked on a mold, an upper mold is covered, and the mold is placed in a hot press and a certain temperature and pressure are applied, vacuum is applied, and the mold is closed; the hot pressing temperature is 85-135℃, the pressure is 2.5-5 MPa, and the holding time is 20-50 min.

[0011] The second aspect is:

[0012] A positioning mechanism of a greenhouse roller shutter machine, comprising a plurality of front positioning structures; each front positioning structure comprises a fixed rod, and further comprises a front positioning hook matched with the fixed rod, the material of the front positioning hook is the actuator material provided in the first aspect, and the fiber orientation direction of the fiber layer of the actuator material is consistent with the bending of the hook (that is, during the forming process of the actuator material, the actuator material will naturally deform in the orientation direction perpendicular to the fiber axis after cooling and demolding, forming a hook shape, and after cutting and trimming, the hook can be used as a hook); the front positioning hook is connected with a reset support rod; the reset support rod is made of insulating and high-temperature resistant material; the reset support rod is slidingly connected with a support barrel; a reset spring is arranged in the support barrel, and the reset spring is arranged between the reset support rod and the closed end of the support barrel. The fixed rod and the positioning hook of the positioning structure are arranged on the greenhouse roller shutter machine and the greenhouse respectively, and cooperate to position the greenhouse roller shutter machine and the roller shutter.

[0013] Further, the fixed rod is fixedly connected with a pair of vertical support rods, and the two ends of the fixed rod are respectively fixedly connected with the two support rods; the fixed rod is fixedly connected with a buffer plate, the buffer plate is obliquely arranged, and the buffer plate is matched with the front positioning hook; the buffer plate is obliquely arranged downward from the fixed rod to the support barrel; the drive of the greenhouse roller shutter machine is fixedly connected with the support rod, and the greenhouse is fixedly connected with the support barrel.

[0014] Further, the end of the roller rod of the greenhouse roller shutter machine away from the drive is rotationally connected with a sliding seat; the sliding seat is slidingly connected with a sliding rail, and the sliding rail is fixedly arranged; the sliding seat is fixedly connected with the support rod. The sliding seat is provided with a rotating hole coaxial with the roller rod, and the roller rod is rotationally arranged around the rotating hole of the sliding seat.

[0015] Further, the front positioning hook is provided above with a sunshade plate, the sunshade plate is fixedly connected with a sunshade support rod, and the bottom end of the sunshade support rod is fixedly connected with the greenhouse.

[0016] Further, the buffer plate is uniformly provided with a round rod, the round rod is rotationally connected with the buffer plate; the round rod is parallel to the fixed rod; and the support barrel is perpendicular to the support rod.

[0017] Further, the positioning mechanism of the greenhouse roller shutter machine further comprises one or more rear positioning structures; the rear positioning structure comprises a connecting plate fixedly connected with the greenhouse, and the connecting plate is fixedly connected with a rear positioning hook; the material of the rear positioning hook is the actuator material provided in the first aspect, the fiber orientation direction of the fiber layer of the actuator material is consistent with the bending axis of the hook; the rear positioning hook is uniformly provided with a heat insulation plate, the heat insulation plate is made of soft high-temperature-resistant material, and the heat insulation plate is matched with the curtain cloth of the greenhouse. The rear positioning hook is arranged above the greenhouse, and the rear positioning hook is provided above with a sunshade plate.

[0018] Further, the front positioning hook and the rear positioning hook are both connected with a power supply and electrically connected with the copper foil in the actuator material.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] In the present application, the polymer is used as the active layer of the actuator, and the fiber layer is used as the passive layer of the actuator, the copper foil is heated to cause thermal expansion difference between the polymer active layer and the fiber passive layer, and then the material is deformed.

[0021] At the same time, the mechanical properties of the actuator are improved through multi-layer compounding, so that the actuator can be made into a hook, and after the copper foil is heated by power supply, the hook can be stretched to complete the unhooking action.

[0022] Secondly, the adhesion released by the polymer or the adhesion released by the fiber pre-impregnated material between the composite layers is adhered together under the condition of hot pressing, the welding process of the bimetallic strip actuator is avoided, the interface is tightly combined, the process is mature, and the efficient batch production of the intelligent actuator is facilitated.

[0023] Further, the application applies the brake material to prepare the positioning hook and applies it to the agricultural greenhouse industry, which prolongs the service life of the greenhouse roller curtain through simple mechanical components and low power consumption, and has practical application and popularization value. The positioning mechanism of the greenhouse roller curtain machine is matched by setting the fixed rod and the front positioning hook, the front positioning hook is lifted by the fixed rod and is reset under the action of the reset spring, is connected with the fixed rod and limits the fixed rod, and the fixed rod limits the greenhouse roller curtain and the roller curtain from sliding down; the front positioning hook can be expanded after being heated, so that the fixed rod can be separated from the front positioning hook, and the stable winding and unwinding of the roller curtain are ensured; the front positioning structure can avoid the safety problem caused by loosening of the drive brake, and the front positioning structure is convenient to overhaul and more safe and reliable; and the top of the roller curtain is not pulled, the wear of the top of the roller curtain is reduced, and the service life of the roller curtain is improved.

[0024] The support rod can support the fixed rod, so that a gap is formed between the fixed rod and the drive, and the front positioning hook is connected with the fixed rod; the buffer plate can be in contact with the lower part of the front positioning hook, so that the front positioning hook is lifted; the round rod can produce rotating friction with the front positioning hook, so as to reduce wear. The slide rail and the slide seat can keep the direction of the support rod stable, so as to avoid rotating with the winding rod; the front positioning structure is arranged at both ends of the greenhouse roller curtain machine and the greenhouse, so that the greenhouse roller curtain machine can be kept stable.

[0025] Since the front positioning hook and the rear positioning hook are exposed, the front positioning hook will be heated after being exposed to light, which may cause the front positioning hook to deform and affect the stability of the front positioning structure and the rear positioning structure; the sunshade can block light to ensure the stability of the front positioning hook and the rear positioning hook; the heat insulation plate is connected to the rear positioning hook, so as to avoid that the roller curtain is directly heated; a plurality of heat insulation plates are arranged, so as to reduce the deformation amount of the heat insulation plate and expand the material selection range. The front positioning hook and the rear positioning hook are both connected with the power supply, so as to conveniently heat the front positioning hook and the rear positioning hook to deform them. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a gesture physical object diagram formed by the brake material under the electric drive in the embodiment;

[0027] Figure 2 is a front positioning structure and rear positioning structure position schematic view of the embodiment 1 of the application;

[0028] Figure 3 is a front positioning structure and rear positioning structure side view of the embodiment 1 of the application;

[0029] Figure 4 is Figure 3 is a local enlarged view of

[0030] Figure 5Supporting barrel internal structure schematic diagram of embodiment 1 of the present application;

[0031] Figure 6 Fixed rod and buffer plate connection schematic diagram of embodiment 1 of the present application;

[0032] Figure 7 is Figure 4 a partial enlarged view.

[0033] In the figure: front positioning structure 1, rear positioning structure 2, fixed rod 3, front positioning hook 4, reset support rod 5, supporting barrel 6, reset spring 7, support rod 8, driver 9, buffer plate 10, round rod 11, sliding seat 12, sliding rail 13, rear support rod 14, connecting plate 15, rear positioning hook 16, heat insulation plate 17, sunshade plate 18, sunshade support rod 19. DETAILED DESCRIPTION

[0034] Embodiment 1

[0035] The actuator material in this embodiment includes an active layer, a passive layer and a copper foil, wherein the active layer is a polymer layer, and the passive layer is an oriented fiber layer. The fiber layer selects carbon fiber with a laying thickness of 0.35 mm; the polymer layer material selects polyether ether ketone with a thickness of 0.15 mm; and the copper foil has a thickness of 0.08 mm. The copper foil layer, the fiber layer and the polymer layer are sequentially laminated and spread to obtain the actuator material as shown in Figure 1 which can perform gesture motion under electric heating driving.

[0036] To improve the strength of the material, in this embodiment, the fiber layer and the polymer layer each have 4 layers, i.e. 8 layers in total, that is, the copper foil is laid as the bottom layer, the first layer on the copper foil is the fiber layer, the second layer is the polymer layer, the third layer is the fiber layer, the fourth layer is the polymer layer, and the eight layers are alternately spread in sequence; the total thickness is about 2 mm.

[0037] The hot pressing composite process is specifically: the polymer is dried in a vacuum drying box for a period of time, the copper foil is pasted on the lower die surface of the aluminum alloy mold, and then the fiber layer and the polymer layer are laid and pasted layer by layer according to the above requirements. After laying is completed, the upper die is covered, and the hot press is placed in the hot press and a certain temperature and pressure are applied, vacuum is applied, and the mold is closed. The hot pressing temperature is 130℃, the pressure is 5MPa, and the holding time is 40min.

[0038] Embodiment 2

[0039] A positioning mechanism of a greenhouse roller shutter machine, as shown in Figures 2-6 includes a plurality of front positioning structures 1, and also includes one or more rear positioning structures 2; as shown in Figures 3-5As shown in the drawings, each front positioning structure 1 comprises a fixed rod 3, and a front positioning hook 4 matched with the fixed rod 3, the front positioning hook 4 is consistent with the inclined direction of the slope of the greenhouse, and the material of the front positioning hook 4 is the actuator material prepared in Embodiment 1. The front positioning hook 4 is fixedly connected with a reset support rod 5; the reset support rod 5 is perpendicular to the slope of the greenhouse, and the reset support rod 5 is made of insulating plastic; the reset support rod 5 is slidingly connected with a support barrel 6 parallel to the reset support rod 5, and the bottom end of the reset support rod 5 is arranged in the support barrel 6; the bottom end of the support barrel 6 is closed, and the top end is provided with an opening; the reset spring 7 is arranged in the support barrel 6, the bottom end of the reset spring 7 is fixedly connected with the bottom end of the support barrel 6, and the top end of the reset spring 7 is fixedly connected with the bottom end of the reset support rod 5. The bottom ends of the plurality of support barrels 6 are fixedly connected at the left and right ends of the top of the greenhouse.

[0040] As shown in the drawings, Figure 4 and Figure 6 The fixed rod 3 is consistent with the length direction of the greenhouse; a pair of support rods 8 perpendicular to the fixed rod 3 are fixedly connected on the fixed rod 3, the support rods 8 are parallel to the front positioning hook 4, and the pair of support rods 8 are respectively fixedly connected with the two ends of the fixed rod 3. The fixed rod 3 is fixedly connected on the drive 9 of the greenhouse roller shutter machine through the support rods 8, and the support rods 8 are fixedly arranged on the side opposite to the front positioning hook 4 of the drive 9. The fixed rod 3 is fixedly connected with a buffer plate 10, the buffer plate 10 is arranged on the side of the fixed rod 3 close to the front positioning hook 4, and the buffer plate 10 is arranged in an inclined manner; the buffer plate 10 is inclined downward from the fixed rod 3 to the support barrel 6; a plurality of round rods 11 are uniformly arranged on the buffer plate 10, the round rods 11 are all rotationally connected with the buffer plate 10, and the round rods 11 are all parallel to the fixed rod 3. The end of the winding rod of the greenhouse roller shutter machine away from the drive 9 is rotationally connected with a sliding seat 12; the sliding seat 12 is slidingly connected with a sliding rail 13, the sliding rail 13 is consistent with the inclined direction of the slope of the greenhouse, and the sliding rail 13 is fixedly connected with the greenhouse; the fixed rod 3 is connected with the sliding seat 12 through the support rods 8, and the support rods 8 are fixedly arranged on the side opposite to the front positioning hook 4 of the sliding seat 12. A rotating hole coaxial with the winding rod is formed in the sliding seat 12, and the winding rod is rotationally arranged around the rotating hole axis of the sliding seat 12. The fixed rod 3 on the sliding seat 12 and the drive 9 is matched with the front positioning hook 4 on the greenhouse to position the greenhouse roller shutter machine and the roller shutter.

[0041] As shown in the drawings, Figures 2-4 The rear positioning structure 2 is arranged between the support barrels 6 at the two ends of the greenhouse; the rear positioning structure 2 comprises a rear support rod 14 fixedly connected on the greenhouse, and the rear support rod 14 is parallel to the support barrel 6; the top end of each rear support rod 14 is fixedly connected with a connecting plate 15 parallel to the front positioning hook 4, and the connecting plate 15 is fixedly connected with a rear positioning hook 16 parallel to the connecting plate 15, and the material of the rear positioning hook 16 is the actuator material prepared in Embodiment 1.

[0042] As shown in the drawings, Figure 7As shown, heat insulation plates 17 are evenly distributed on the inner side of the rear positioning hook 16. The heat insulation plates 17 are made of silicone material and are used in conjunction with the curtain of the greenhouse.

[0043] like Figures 2-4 As shown, a sunshade 18 is installed above each front positioning hook 4 and rear positioning hook 16. The sunshade 18 is perpendicular to the support barrel 6. Each sunshade 18 is fixedly connected to a sunshade support rod 19. The bottom end of the sunshade support rod 19 is fixedly connected to the greenhouse. Both the front positioning hook 4 and the rear positioning hook 16 are connected to a power source. Soft insulating material can be fitted on both the front positioning hook 4 and the rear positioning hook 16 to provide protection.

[0044] During operation, the driver 9 of the greenhouse curtain rolling machine drives the roller to rotate, and the roller causes the curtain below to roll up. At this time, the rear positioning hook 16 is powered on, and the rear positioning hook 16 straightens after being heated, without affecting the curtain rolling. When the driver 9 and the roller rod move upwards and contact the buffer plate 10 with the front positioning hook 4, the buffer plate 10 and the fixed rod 3 connected to the driver 9 and the slide 12 lift the front positioning hook 4. The front positioning hook 4 drives the reset support rod 5 to move upwards, and the reset spring 7 is stretched. When the fixed rod 3 moves to disengage from the front positioning hook 4, the greenhouse curtain machine triggers the limit switch and stops. The reset spring 7 shortens and resets, and drives the reset support rod 5 and the front positioning hook 4 to move downwards and reset. The inner side of the front positioning hook 4 hooks the fixed rod 3, restricting the fixed rod 3 and the greenhouse curtain machine from moving downwards. Then the power supply to the rear positioning hook 16 is disconnected, and the rear positioning hook 16 bends back to reset. The silicone material on the inner side of the rear positioning hook 16 hooks the curtain, restricting the curtain and the greenhouse curtain machine from moving downwards.

Claims

1. A positioning mechanism for a greenhouse roller, characterized in that, The front positioning structure comprises a fixed rod, a front positioning hook matched with the fixed rod, a reset support rod connected with the front positioning hook, a support barrel in sliding connection with the reset support rod, and a reset spring arranged in the support barrel and between the reset support rod and an end of the support barrel closed with the reset support rod.

2. The positioning mechanism for a greenhouse curtain machine according to claim 1, wherein The fixed rod is fixedly connected with a pair of support rods perpendicular to the fixed rod, and the pair of support rods are respectively fixedly connected with two ends of the fixed rod.

3. The positioning mechanism for a greenhouse curtain machine according to claim 2, wherein The fixed rod is fixedly connected with a buffer plate, and the buffer plate is arranged obliquely and matched with the front positioning hook.

4. The positioning mechanism for a greenhouse curtain machine according to claim 3, wherein The front positioning hook is provided above with a sunshade plate, and the sunshade plate is fixedly connected with a sunshade support rod.

5. The positioning mechanism for a greenhouse curtain machine according to claim 4, wherein The buffer plate is uniformly provided with a round rod in rotation connection with the buffer plate.

6. The positioning mechanism of a big greenhouse curtain machine according to any one of claims 1-5, characterized in that, The rear positioning structure comprises a connecting plate fixedly connected with the greenhouse, a rear positioning hook fixedly connected with the connecting plate, and a heat insulation plate uniformly distributed on the rear positioning hook.

7. The hoφtion mechanism for a greenhouse according to claim 6, wherein The front positioning hook and the rear positioning hook are both connected with a power supply and electrically connected with the copper foil in the actuator material.

8. The positioning mechanism for a greenhouse curtain machine according to claim 1, characterized in that, The non-metallic fiber layer is selected from one or more of carbon fiber, glass fiber, basalt fiber, ultra-high molecular weight polyethylene fiber, polyimide fiber, polyester, and silk.

9. The hoφion mechanism for a greenhouse according to claim 8, wherein The thickness of the fiber layer is 50-1000 microns, and the thickness of the polymer layer is 30-1000 microns. The number of layers of the polymer layer and the fiber layer is the same, and each has 4-6 layers.

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