Gravity falling type roller shutter mechanism for livestock farm ventilation system

Abstract

The utility model discloses a gravity falling type roller shutter mechanism for a livestock farm ventilation system, which comprises roller shutter cloth, a plurality of counterweight mounting parts are arranged on the roller shutter cloth, counterweight pipes are respectively and horizontally sleeved in the counterweight mounting parts at the top and the middle of the roller shutter cloth, a counterweight belt is horizontally sleeved in the counterweight mounting part at the bottom of the roller shutter cloth, and the counterweight pipes are connected with the counterweight belts. A winch is arranged on one side of the roller shutter cloth, pulleys are arranged above the top of the air inlet and at a top corner of the air inlet, a steel wire rope is movably connected to the pulleys, one end of the steel wire rope is connected with a counterweight pipe at the top of the roller shutter cloth, and the other end of the steel wire rope penetrates through the pulleys and then is connected with the winch. When the gravity falling type roller shutter mechanism is used, air enters a pig house from the upper portion of the air inlet, the cold stress phenomenon of pigs can be effectively avoided, the roller shutter cloth is contracted through the self weight of the balance weight pipe, the problem that the two ends of the roller shutter cloth deviate and are unbalanced can be effectively solved, and the gravity falling type roller shutter mechanism can be suitable for air inlets of different specifications.

Description

Technical Field

[0001] The utility model relates to a gravity-dropping rolling curtain mechanism for a ventilation system of a breeding farm, and belongs to the technical field of ventilation systems of breeding farms. Background Art

[0002] The ventilation volume of the farm ventilation system is closely related to the size of the air inlet. The air inlet of the farm ventilation system is usually equipped with an air inlet adjustment mechanism, which is used to adjust the size of the air inlet and thus adjust the ventilation volume. At present, there are mainly three types of air inlet adjustment mechanisms in farms:

[0003] The first is a roll-up roller shutter mechanism: Patent CN216492610U discloses a roll-up roller shutter mechanism for a farm ventilation system. The roller shutter mechanism in the patent fixes the roller shutter by a roller shutter strip, and realizes the retraction and extension of the roller shutter by the cooperation of a climbing track, a reduction motor, a climber and a roller tube, thereby realizing the size adjustment of the air inlet of the farm ventilation system, and then realizing the size adjustment of the ventilation volume, and finally meeting the cooling and ventilation requirements of the pig house; however, during the use of the roll-up roller shutter mechanism, the roller shutter cloth is rolled up from the bottom of the air inlet to open , fresh air first enters the pig house from the lower part of the air inlet, resulting in cold stress in pigs close to the air inlet during transitional ventilation in spring and autumn, especially piglets are more susceptible to influenza diarrhea; in addition, since the upper roll-up roller shutter mechanism is a combination of a climber and a roller tube to achieve the retraction and extension of the roller shutter, when the vent is too long, the length of the roller shutter cloth is also too long. When the length of the roller shutter cloth exceeds 15 meters, the two ends of the roller shutter cloth on the roller tube are prone to deviate, which will cause the roller shutter cloth on both sides of the opening to be unbalanced. Therefore, the upper roll-up roller shutter mechanism is not suitable for vents that are too long and its scope of use is limited.

[0004] The second is a PVC sliding curtain plate type adjustment mechanism: Patent CN216821166U discloses an air inlet adjustment mechanism for a farm ventilation system. The air inlet adjustment mechanism in the patent drives the PVC slide plate (sliding curtain plate) to move up and down through the cooperation of a winch, a pulley and a wire rope to achieve the size adjustment of the air inlet of the farm ventilation system, and then achieve the size adjustment of the ventilation volume; although the fresh air of the adjustment mechanism enters the pig house from the upper part of the air inlet, which can effectively prevent the pigs from experiencing cold stress, the main body of the adjustment mechanism is a PVC slide plate. Due to the characteristics of the plate that cannot be folded and bent and transportation restrictions, the length of a single PVC slide plate is usually not more than 5 meters; in addition, the thickness of the PVC slide plate is usually not less than 30-35mm. If the thickness is too thin, it will cause the plate to deform; the above reasons make the PVC sliding curtain plate type adjustment mechanism unsuitable for air inlets with large ventilation volumes. In addition, the PVC slide plate has strict requirements on the load-bearing capacity of the transmission accessories and the installation wall, and the failure rate and maintenance cost of later operation are high, the plate cost is high, and the cost performance is low.

[0005] The third type is the bottom roller shutter mechanism: the bottom roller shutter mechanism mainly uses the roller fixed at the bottom to roll up the shutter cloth, and adjusts the size of the air inlet of the farm ventilation system by the number of rotations of the roller. Compared with the upper roller shutter mechanism, the bottom roller shutter mechanism, although the fresh air enters the pig house from the upper part of the air inlet, can achieve the effect of preheating the cold air, and can effectively prevent pigs from cold stress. However, like the upper roller shutter mechanism, it still relies on the rotation of the roller, and there is still the problem of unbalanced deviation of the two ends of the shutter cloth, and the scope of use is still limited. Utility Model Content

[0006] In view of the above problems existing in the prior art, the purpose of the utility model is to provide a gravity-drop roller shutter mechanism for a ventilation system of a farm.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] A gravity-drop roller shutter mechanism for a ventilation system of a farm, comprising a vertically arranged roller shutter cloth adapted to an air inlet of the ventilation system of the farm, the roller shutter cloth being provided with a plurality of hollow counterweight mounting parts extending in a horizontal direction from top to bottom, counterweight pipes being horizontally sleeved in the counterweight mounting parts at the top and middle of the roller shutter cloth, respectively, and a counterweight belt being horizontally sleeved in the counterweight mounting part at the bottom of the roller shutter cloth, the counterweight mounting part at the bottom of the roller shutter cloth and the counterweight belt being detachably fixed to a wall below the air inlet, a winch being provided on one side of the roller shutter cloth, pulleys being provided above the top of the air inlet and at a top corner of the air inlet, a steel wire rope being movably connected to the pulley, one end of the steel wire rope being connected to the counterweight pipe at the top of the roller shutter cloth, and the other end of the steel wire rope being connected to the winch after passing through the pulley.

[0009] In one implementation scheme, the pulley includes a plurality of top pulleys arranged in sequence from left to right above the top of the air inlet and a corner pulley arranged at the top corner of the air inlet, the steel wire rope includes a main steel wire rope and a branch steel wire rope, one end of the main steel wire rope is connected to the counterweight tube at the top of the rolling curtain, the other end of the main steel wire rope passes through the top pulley above the top of the air inlet and the corner pulley at the top corner of the air inlet in sequence from left to right and is then connected to the winch, one end of the branch steel wire rope is connected to the counterweight tube at the top of the rolling curtain at a corresponding position, and the other end of the branch steel wire rope passes through the top pulley at the corresponding position and is connected to the main steel wire rope.

[0010] A preferred solution is that a transition pulley is provided in the middle upper part of the top of the air inlet, and a transition steel wire rope is movably connected to the transition pulley, one end of the transition steel wire rope is connected to the main steel wire rope, and the other end of the transition steel wire rope passes through the transition pulley and the top pulley close to the corner pulley and is connected to the end of the counterweight tube at the top of the rolling curtain close to the winch.

[0011] In one implementation scheme, a wire rope clamp is provided at the connection between the steel wire rope and the counterweight tube at the top of the rolling curtain cloth.

[0012] In one implementation scheme, end-sealing cloths are vertically provided on the left and right sides of the rolling curtain respectively, and the end-sealing cloths are detachably fixed to the walls on the left and right sides of the air inlet, and the end-sealing cloths are in contact with the rolling curtain but not connected.

[0013] In one implementation scheme, a plurality of upper expansion hooks are sequentially provided from left to right above the top of the air inlet, and a plurality of lower expansion hooks are sequentially provided from left to right below the bottom of the air inlet, and windproof ropes are respectively connected between the upper expansion hooks and the lower expansion hooks.

[0014] A preferred solution is that the upper expansion hooks and the lower expansion hooks are distributed in a staggered manner, and the windproof rope is distributed in a toothed shape at the air inlet and is located on the front side of the rolling curtain.

[0015] Compared with the prior art, the beneficial technical effects of the utility model are:

[0016] The utility model provides a gravity-drop roller shutter mechanism for a ventilation system of a breeding farm, which is provided with a roller shutter cloth, a winch, a pulley and a steel wire rope. Not only can the roller shutter cloth be driven to expand and contract through the cooperation of the winch, the pulley and the steel wire rope to achieve the size adjustment of the air inlet of the ventilation system of the breeding farm, thereby achieving the size adjustment of the ventilation volume, but also fresh air enters the pig house from the upper part of the air inlet when in use, which can effectively prevent pigs from experiencing cold stress. In particular, a plurality of counterweight tubes are horizontally arranged in the roller shutter cloth from top to bottom. When the winch is loosened, the dead weight of the counterweight tubes in the roller shutter cloth can be used to realize the contraction of the roller shutter cloth, which can effectively prevent the problem of unbalanced deviation of the two ends of the roller shutter cloth. The overall installation is convenient, the cost is low, and it is not affected by the size of the hole of the air inlet. It can be applied to air inlets of different specifications, has a wide range of applications, and has significant practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a gravity-drop rolling shutter mechanism provided by an embodiment of the utility model in a fully closed state;

[0018] Figure 2 It is a cross-sectional view of the gravity-dropping rolling shutter mechanism provided by the embodiment of the utility model when it is in a fully closed state;

[0019] Figure 3It is a schematic diagram of a gravity-drop rolling shutter mechanism provided by an embodiment of the utility model in a semi-open state;

[0020] Figure 4 It is a partial schematic diagram showing the two top pulley parts on the left side when the gravity drop type rolling curtain mechanism provided by the embodiment of the utility model is in a semi-open state;

[0021] Figure 5 It is a partial schematic diagram showing the transition pulley and transition steel wire rope portion when the gravity drop type rolling curtain mechanism provided by the embodiment of the utility model is in a semi-open state;

[0022] Figure 6 It is a cross-sectional view of the gravity-dropping rolling shutter mechanism provided by the embodiment of the utility model when it is in a semi-open state;

[0023] Figure 7 It is a schematic diagram of a gravity-drop roller shutter mechanism provided by an embodiment of the utility model in a fully open state;

[0024] Figure 8 It is a cross-sectional view of the gravity-dropping rolling shutter mechanism provided by the embodiment of the utility model when it is in a fully opened state;

[0025] The numbers in the figure are as follows:

[0026] 1. Air inlet; 2. Roller curtain; 2-1. Counterweight installation part; 3. Counterweight tube; 4. Counterweight belt; 5. Wall; 6. Winch; 7. Self-tapping screws; 8. Top pulley; 9. Corner pulley; 10. Main wire rope; 11. Branch wire rope; 12. Transition pulley; 13. Transition wire rope; 14. Wire rope clamp; 15. Winch bracket; 16. Pulley bracket; 17. Expansion bolt; 18. End cloth; 19. Upper expansion hook; 20. Lower expansion hook; 21. Windproof rope. DETAILED DESCRIPTION

[0027] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. In addition, it should be noted that the terms used in the utility model are only for the purpose of describing specific embodiments, and are not intended to limit the utility model. Unless otherwise defined, the technical terms or scientific terms used in the utility model should be the usual meanings understood by people with general skills in the field. The directions or positional relationships indicated by the terms "inside", "outside", "upper", "lower", "top", "bottom", "front", "back", "left", "right", "vertical", "horizontal", etc. are all based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation to the utility model. In addition, terms such as "set", "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection; it can be a direct connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances; in the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined; it should also be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or there can be a central element.

[0028] Example

[0029] See also Figures 1 to 8 As shown, the utility model provides a gravity-drop roller shutter mechanism for a ventilation system of a farm, comprising a vertically arranged roller shutter cloth 2 adapted to an air inlet 1 of the ventilation system of the farm, the roller shutter cloth 2 being provided with a plurality of hollow counterweight mounting portions 2-1 extending in a horizontal direction from top to bottom, counterweight pipes 3 being horizontally sleeved in the counterweight mounting portions 2-1 at the top and middle of the roller shutter cloth 2, and counterweight belts 4 being horizontally sleeved in the counterweight mounting portions 2-1 at the bottom of the roller shutter cloth 2, the counterweight mounting portions 2-1 at the bottom of the roller shutter cloth 2 and the counterweight belts 4 being detachably fixed to a wall 5 below the air inlet, a winch 6 being provided on one side of the roller shutter cloth 2, pulleys being provided above the top of the air inlet 1 and at a top corner of the air inlet 1, a steel wire rope being movably connected to the pulley, one end of the steel wire rope being connected to the counterweight pipe 3 at the top of the roller shutter cloth, and the other end of the steel wire rope being connected to the winch 6 after passing through the pulley.

[0030] In the present invention, the number of the counterweight mounting parts 2-1 can be flexibly adjusted according to actual use requirements. For example, in this embodiment, the rolling curtain 2 is provided with five counterweight mounting parts 2-1 from top to bottom, the counterweight pipes 3 are respectively installed in the upper four counterweight mounting parts 2-1, and the counterweight belt 4 is installed in the bottom counterweight mounting part 2-1 (please refer to the embodiment of the present invention). Figures 1 to 3 and Figure 6 as shown).

[0031] In the utility model, the counterweight tube 3 can be a commercially available round steel tube, which is convenient for the contraction and expansion of the rolling curtain fabric 2.

[0032] In the present invention, the counterweight belt 4 can be a commercially available flat steel belt, which is convenient for fixing together with the counterweight mounting portion 2-1 at the bottom of the rolling curtain 2 on the wall 5 below the air inlet. When fixing, self-tapping screws 7 can be used to fix it on the wall 5. For details, please refer to Figure 2 As shown, one end of the self-tapping screw 7 passes through the counterweight mounting portion 2-1 at the bottom of the rolling curtain 2 and the counterweight belt 4 and is fixed in the wall 5 below the air inlet, thereby removably fixing the bottom end of the rolling curtain 2 and the counterweight belt 4 to the wall 5 below the air inlet.

[0033] In the utility model, the capstan 6, the pulley and the wire rope are all commercially available products.

[0034] In this utility model, please refer to Figure 1 , Figure 3 and Figure 7 As shown, the pulley includes a plurality of top pulleys 8 arranged in sequence from left to right above the top of the air inlet 1 and a corner pulley 9 arranged at the top corner of the air inlet 1, and the steel wire rope includes a main steel wire rope 10 and a branch steel wire rope 11, one end of the main steel wire rope 10 is connected to the counterweight tube 3 at the top of the rolling curtain 2, and the other end of the main steel wire rope 10 passes through the top pulley 8 above the top of the air inlet 1 and the corner pulley 9 at the top corner of the air inlet 1 from left to right and is then connected to the winch 6, one end of the branch steel wire rope 11 is connected to the counterweight tube 3 at the top of the rolling curtain 2 at the corresponding position, and the other end of the branch steel wire rope 11 passes through the top pulley 8 at the corresponding position and is connected to the main steel wire rope 10. In this way, the counterweight tube 3 on the top of the rolling curtain 2 can be driven to move up and down through the top pulley 8, the corner pulley 9, the main steel wire rope 10, the branch steel wire rope 11 and the winch 6, so that the air inlet area of ​​the air inlet 1 can be adjusted from the upper part of the air inlet 1, thereby realizing the size adjustment of the ventilation volume of the pig house, and in the process of ventilation volume adjustment, fresh air enters the pig house from the upper part of the air inlet 1, which can effectively avoid cold stress in pigs.

[0035] The number of top pulleys 8 can be flexibly adjusted according to actual usage requirements. For example, in this embodiment, four top pulleys 8 are provided, and the four top pulleys 8 are installed on the wall 5 above the top of the air inlet 1 from left to right. Correspondingly, one end of the main steel wire rope 10 is connected to the left end of the counterweight tube 3 at the top of the rolling curtain 2, and the other end of the main steel wire rope 10 passes through the four top pulleys 8 and a corner pulley 9 from left to right and is connected to the winch 6.

[0036] In addition, a transition pulley 12 is provided in the middle of the top upper part of the air inlet 1, and a transition steel wire rope 13 is movably connected to the transition pulley 12. One end of the transition steel wire rope 13 is connected to the main steel wire rope 10, and the other end of the transition steel wire rope 13 passes through the transition pulley 12 and the top pulley 8 (equivalent to the top pulley 8) near the corner pulley 9. Figure 3 The top pulley 8 on the right side of the curtain is connected to the end of the counterweight pipe 3 on the top of the curtain cloth 2 close to the capstan 6 (equivalent to Figure 3 The right end of the counterweight pipe 3 at the top is connected. The transition pulley 12 and the transition wire rope 13 effectively extend the stroke of the wire rope as a whole.

[0037] In the present invention, the connection between the steel wire rope and the counterweight tube 3 at the top of the rolling curtain 2 is provided with a steel wire rope clamp 14 to facilitate the connection between the steel wire rope and the counterweight tube 3. Correspondingly, the connection between the main steel wire rope 10, the branch steel wire rope 11, the transition steel wire rope 13 and the counterweight tube 3 is provided with a steel wire rope clamp 14.

[0038] In addition, wire rope clamps 14 are provided at the connection points between the branch wire rope 11 and the main wire rope 10 and at the connection points between the transition wire rope 13 and the main wire rope 10, thereby strengthening the connection between the branch wire rope 11, the transition wire rope 13 and the main wire rope 10, and the branch wire rope 11, the transition wire rope 13 and the main wire rope 10 are connected as a whole through the wire rope clamps 14.

[0039] In the utility model, the winch 6, the top pulley 8, the corner pulley 9 and the transition pulley 12 can be detachably mounted on the wall 5 around the air inlet 1. Specifically, a winch bracket 15 is provided at a position corresponding to the winch 6 on the wall 5 around the air inlet 1, and the winch 6 is mounted on the winch bracket 15. Correspondingly, pulley brackets 16 are provided at positions corresponding to the top pulley 8, the corner pulley 9 and the transition pulley 12 on the wall 5 around the air inlet 1. The pulley 8, the corner pulley 9 and the transition pulley 12 are respectively mounted on the corresponding pulley brackets 16. Figure 3 and Figure 5 As shown, the transition pulley 12 and the middle top pulley 8 (specifically the third top pulley 8 from left to right) share a pulley bracket 16. During installation, the winch bracket 15 and the pulley bracket 16 are detachably mounted on the wall 5 at the corresponding position through fasteners (for example, expansion bolts 17).

[0040] In this utility model, please refer to Figure 1 , Figure 3 and Figure 7 As shown, the left and right sides of the rolling curtain 2 are respectively vertically provided with end cloths 18, and the end cloths 18 are detachably fixed to the walls 5 on the left and right sides of the air inlet 1, and the end cloths 18 are in contact with the rolling curtain 2 but not connected (that is, the end cloths 18 are in contact with the rolling curtain 2 but do not move together, such as Figure 1 , Figure 3 and Figure 7 As shown, during the process of the rolling curtain 2 moving up and down, the end cloth 18 is fixed on the wall 5 on the left and right sides of the air inlet 1). The roll-up roller shutter mechanism disclosed in patent CN216492610U has a climbing track on one side of the roller shutter, which results in that the end cloths cannot be installed on both sides of the air inlet in patent CN216492610U, resulting in the left and right sides of the roller shutter not being sealed tightly. When the air inlet needs to be closed in seasons such as autumn and winter, the air inlet is not sealed tightly, and a large amount of wind enters the pig house from both sides of the air inlet, resulting in the pig house not being heat-insulated. The gravity-drop roller shutter mechanism described in the utility model does not need to be provided with a climbing track on the side of the air inlet 1. Therefore, end cloths 18 can be provided on the walls 5 on the left and right sides of the air inlet 1. The end cloths 18 can seal the gap between the left and right sides of the roller shutter 2 and the air inlet 1. When the weather is cold in seasons such as autumn and winter, the roller shutter 2 is in Figure 1 In the fully closed state shown, it is possible to effectively prevent wind from entering the pig house from the air inlet 1. During installation, the end capping cloth 18 is detachably fixed to the wall 5 on the left and right sides of the air inlet 1 by fasteners (eg, self-tapping screws).

[0041] In the utility model, a plurality of upper expansion hooks 19 are sequentially arranged from left to right on the top of the air inlet 1, and a plurality of lower expansion hooks 20 are sequentially arranged from left to right on the bottom of the air inlet 1. Windproof ropes 21 are respectively connected between the upper expansion hooks 19 and the lower expansion hooks 20 (see Figure 2 , Figure 6 and Figure 8 The windproof rope 21 has a windproof effect and can prevent the rolling curtain 2 from swinging randomly due to the wind when there is wind. The number of the upper expansion hooks 19 and the lower expansion hooks 20 can be flexibly adjusted according to actual use requirements. In this embodiment, three upper expansion hooks 19 and four lower expansion hooks 20 are provided. The upper expansion hooks 19 and the lower expansion hooks 20 can be directly installed on the wall 5 at the corresponding position around the air inlet 1 (see Figure 1 as shown).

[0042] In addition, the upper expansion hook 19 and the lower expansion hook 20 are arranged in a staggered manner, and the windproof rope 21 is arranged in a toothed shape at the air inlet 1 and in front of the rolling curtain 2. That is, the windproof rope 21 is connected between the upper expansion hook 19 and the two adjacent lower expansion hooks 20. The windproof rope 21 arranged in a toothed shape has a better windproof effect (see Figure 1 as shown).

[0043] The working method of the gravity-dropping rolling curtain mechanism for the ventilation system of a farm provided by the utility model is as follows:

[0044] The rolling curtain 2, winch 6, pulley and wire rope are installed at the air inlet 1 of the ventilation system of the place that needs ventilation in the farm (including but not limited to the farrowing house, nursery house and other pig houses), and the gravity-dropping rolling curtain mechanism can be installed at the air inlet 1;

[0045] When the pig house in the farm needs to be kept warm, the gravity-drop roller shutter mechanism is in Figure 1 The fully closed state shown, at this time, the rolling curtain 2 completely covers the air inlet 1, and the air inlet area of ​​the air inlet 1 is zero;

[0046] When the temperature in the pig house of the farm exceeds the set temperature, the air inlet 1 needs to increase the ventilation volume to reduce the temperature, turn the winch 6 (the winch 6 can be a commercially available product, which can be a manual winch or an automatic winch), loosen the wire rope (main wire rope 10, branch wire rope 11, transition wire rope 13), and the end of the wire rope connected to the counterweight pipe 3 at the top of the rolling curtain 2 moves downward along the corresponding pulleys (top pulley 8, corner pulley 9, transition pulley 12) under the action of gravity. At this time, the rolling curtain 2 automatically falls down under the gravity of the counterweight tube 3 inside it, the rolling curtain 2 shrinks downward, the air inlet 1 starts to open from the top, the air inlet area of ​​the air inlet 1 becomes larger, fresh air enters the pig house from the top of the air inlet 1, the ventilation volume of the pig house becomes larger, and the temperature of the pig house begins to decrease. When the ventilation volume of the pig house meets the requirements, the winch 6, the wire rope and the rolling curtain 2 stop running; the opening state of the air inlet 1 (that is, the opening state of the gravity-dropping rolling curtain mechanism) is adjusted according to the ventilation volume requirements of the pig house, which can be Figure 3 The half-open state shown can also be Figure 7 The fully open state shown, when the gravity-drop roller shutter mechanism is in Figure 3 In the semi-open state shown, the air inlet area of ​​the air inlet 1 is moderate. Figure 7 In the fully open state shown, the air inlet area of ​​air inlet 1 is the largest;

[0047] When the temperature in the pig house of the farm is lower than the set temperature, the air inlet 1 needs to reduce the ventilation volume to increase the temperature, turn the winch 6, tighten the wire rope, and the end of the wire rope connected to the counterweight pipe 3 on the top of the rolling curtain 2 moves upward along the corresponding pulley under the action of gravity. The counterweight pipe 3 on the top of the rolling curtain 2 moves upward under the pull of the wire rope, and the rolling curtain 2 unfolds upward. The air inlet area of ​​the air inlet 1 becomes smaller, the ventilation volume of the pig house becomes smaller, and the temperature of the pig house begins to rise. When the ventilation volume of the pig house meets the requirements, the winch 6, the wire rope and the rolling curtain 2 stop running;

[0048] In this way, the rotation of the winch 6 can drive the rolling curtain 2 to expand and contract, so as to adjust the size of the air inlet of the ventilation system of the farm, and then adjust the size of the ventilation volume.

[0049] As can be seen from the above, during the adjustment process of the air inlet 1, the air inlet 1 is opened and closed from the top. Therefore, fresh air enters the pig house from the top of the air inlet 1. Compared with the traditional upward rolling shutter mechanism, it can effectively prevent the pigs from experiencing cold stress. In addition, when the air inlet 1 is opened, the gravity-drop shutter mechanism uses the deadweight of the counterweight tube 3 arranged inside the shutter 2 to achieve the contraction of the shutter 2 (such as Figure 2 , Figure 6 and Figure 8 As shown), compared with the traditional upper roll-up shutter mechanism and the bottom scroll shutter mechanism, it can effectively avoid the problem of unbalanced deviation of the two ends of the shutter cloth 2; in addition, the main body of the gravity drop shutter mechanism is the shutter cloth, which has low cost and is easy to install. It is not affected by the size of the air inlet hole. Compared with the traditional PVC sliding curtain plate adjustment mechanism, it can be applied to air inlets of different specifications and has a wide range of applications.

[0050] Finally, it is necessary to point out that the above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited to this. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the utility model should be covered within the protection scope of the utility model.

Claims

1. A gravity-drop roller shutter mechanism for a farm ventilation system, comprising a vertically arranged roller shutter cloth adapted to an air inlet of the farm ventilation system, characterized in that: The rolling curtain cloth is provided with a plurality of hollow counterweight mounting parts extending in the horizontal direction from top to bottom, and counterweight tubes are horizontally sleeved in the counterweight mounting parts at the top and middle of the rolling curtain cloth, and a counterweight belt is horizontally sleeved in the counterweight mounting part at the bottom of the rolling curtain cloth, and the counterweight mounting part and the counterweight belt at the bottom of the rolling curtain cloth are detachably fixed to the wall below the air inlet, a winch is provided on one side of the rolling curtain cloth, and pulleys are provided above the top of the air inlet and at a top corner of the air inlet, a steel wire rope is movably connected to the pulley, one end of the steel wire rope is connected to the counterweight tube at the top of the rolling curtain cloth, and the other end of the steel wire rope is connected to the winch after passing through the pulley.

2. The gravity-drop roller shutter mechanism for a farm ventilation system according to claim 1, characterized in that: The pulley includes a plurality of top pulleys arranged in sequence from left to right above the top of the air inlet and a corner pulley arranged at the top corner of the air inlet, the steel wire rope includes a main steel wire rope and a branch steel wire rope, one end of the main steel wire rope is connected to the counterweight tube at the top of the rolling curtain, the other end of the main steel wire rope passes through the top pulley above the top of the air inlet and the corner pulley at the top corner of the air inlet from left to right and is then connected to the winch, one end of the branch steel wire rope is connected to the counterweight tube at the top of the rolling curtain at a corresponding position, and the other end of the branch steel wire rope passes through the top pulley at the corresponding position and is connected to the main steel wire rope.

3. The gravity-dropping rolling shutter mechanism for a farm ventilation system according to claim 2, characterized in that: A transition pulley is provided in the middle of the top upper part of the air inlet, and a transition steel wire rope is movably connected to the transition pulley. One end of the transition steel wire rope is connected to the main steel wire rope, and the other end of the transition steel wire rope passes through the transition pulley and the top pulley close to the corner pulley and is connected to one end of the counterweight pipe at the top of the rolling curtain close to the winch.

4. The gravity-dropping rolling shutter mechanism for a farm ventilation system according to claim 1, characterized in that: The left and right sides of the rolling curtain are respectively provided with end-sealing cloths vertically, and the end-sealing cloths are detachably fixed on the walls on the left and right sides of the air inlet, and the end-sealing cloths are in contact with the rolling curtain but not connected.

5. The gravity-dropping rolling shutter mechanism for a farm ventilation system according to claim 1, characterized in that: A plurality of upper expansion hooks are arranged in sequence from left to right above the top of the air inlet, and a plurality of lower expansion hooks are arranged in sequence from left to right below the bottom of the air inlet, and windproof ropes are respectively connected between the upper expansion hooks and the lower expansion hooks.

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