Animal-friendly cattle grouping assembly for cattle farm

Abstract

The utility model relates to an animal-friendly cattle grouping assembly for a cattle farm. A cattle entering channel is divided into a cattle entering channel body, a detection channel body and a grouping channel body in the cattle walking direction. A split semi-closed butterfly door assembly is mounted at the joint of the cattle entering channel and the detection channel in a hinged manner, and each butterfly door of the split semi-closed butterfly door assembly is connected with a butterfly door driving cylinder; a split semi-closed grouping door assembly is mounted at the tail part of the grouping channel in a hinged manner; each grouping door of the split semi-closed grouping door assembly is connected with a grouping door driving air cylinder, and a butterfly door driving air cylinder and the grouping door driving air cylinders are connected with a pneumatic control box; and a cattle channel urging device is at least arranged at the joint of the detection channel and the grouping channel. According to the automatic cattle grouping system, efficient and accurate cattle grouping is achieved, meanwhile, the staying time of the cattle in the channel is shortened, and congestion and stress risks are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of livestock breeding equipment technology, especially relates to a kind of animal-friendly type cattle grouping assembly for cattle farm. BACKGROUND

[0002] With the continuous progress of science and technology, China's modern dairy farming is undergoing a profound transformation. Domestic ranches continue to expand, and the number of dairy cows has increased dramatically. Traditional cattle management methods have been unable to meet the efficient operation needs of modern ranches. In large ranches, especially those with tens of thousands of dairy cows, about 15% of lactating cows need to be handled every day, such as breeding, pregnancy testing, diagnosis, grouping, hoof trimming, drying, etc. However, if these tasks rely on manual search and handling of cattle, not only is the efficiency low, but it also easily disrupts the normal rhythm of the cows, which in turn adversely affects their health and production performance.

[0003] To improve the efficiency of cattle management, some ranches have equipped group separation gates. However, the existing group separation gate devices often have unreasonable structures, resulting in low group separation accuracy. For example, some group separation gate devices fail to effectively control the number of cattle entering the group separation gate device, making the grouping process chaotic and the precision difficult to guarantee. In addition, some group separation gate devices also have problems in terms of traffic efficiency, which can easily cause cattle congestion, resulting in the group separation gate not being able to fully play its due role, and also seriously affecting milking efficiency and cow rest. These problems not only increase the stress response of cows, but also increase the labor intensity of ranch technical personnel, reduce the ratio of people to cattle, and affect the overall operational efficiency of the ranch.

[0004] For example, Chinese patent (CN208768683U) discloses a pneumatic group separation gate device, but it does not set up a butterfly door structure, which cannot accurately control the number of cattle entering the group separation gate device, resulting in low group separation precision. To solve this problem, people have added a butterfly door to the existing group separation device. The butterfly door closes the passage to separate each cow, effectively improving the group separation precision. However, in real-life situations, some cattle will stop in the passage, causing congestion of the following cattle. This not only affects the group separation efficiency, but also can cause unnecessary stress to the cows.

[0005] Therefore, there is an urgent need for a cattle grouping assembly that can prompt cattle to move forward, improve group separation efficiency, and be friendly to animals. UTILITY MODEL CONTENT

[0006] The utility model provides a kind of animal-friendly type cattle grouping assembly for cattle farm, to solve the problems of prior art.The utility model is just proposed for this technical problem, by setting cattle passageway prompting device in the specific position of cattle access channel, and combining the design of half-closed butterfly door assembly and half-closed grouping door assembly, the efficient and accurate grouping of cattle is realized, while the stay time of cattle in the passageway is reduced, and the congestion and stress risk are reduced.

[0007] The utility model is implemented as follows: a kind of animal-friendly type cattle grouping assembly for cattle farm, characterized by: the cattle access channel, the cattle access channel is divided into cattle access channel, detection channel and grouping channel along the direction of cattle walking;

[0008] The half-closed butterfly door assembly of opposite opening is hingedly installed at the junction of the cattle access channel and the detection channel, and each butterfly door of the half-closed butterfly door assembly of opposite opening is connected to a butterfly door driving cylinder;The half-closed grouping door assembly of opposite opening is hingedly installed at the tail of the grouping channel;Each grouping door of the half-closed grouping door assembly of opposite opening is connected to a grouping door driving cylinder, and the butterfly door driving cylinder and the grouping door driving cylinder are connected to a pneumatic control box;At least a cattle passageway prompting device is provided at the junction of the detection channel and the grouping channel.

[0009] Further preferably, the cattle passageway prompting device includes an inductive switch, which is arranged in the cattle passageway and used for detecting the stay time of the cattle in the passageway;

[0010] A time delay relay is electrically connected to the inductive switch and is triggered and gives a signal when the inductive switch detects that the stay time of the cattle exceeds a preset threshold;

[0011] A gas blowing device is connected to a gas source through a gas pipe and receives the signal of the time delay relay, and blows gas to the cattle staying in the passageway to prompt the cattle to walk forward as soon as possible when the signal is received.

[0012] Further preferably, the gas blowing device includes a gas valve connected to the gas source through a gas pipe for receiving gas from the gas source.

[0013] The control input end of the gas valve is connected to the output end of the time delay relay for receiving the control signal output by the time delay relay.

[0014] A gas blowing nozzle is arranged in the cattle passageway and connected to the output end of the gas valve, and when the gas valve receives the control signal, the gas blowing nozzle is opened and blows gas to the cattle staying in the passageway to prompt the cattle to walk forward as soon as possible.

[0015] Further preferably, gas blowing nozzles are provided in the middle and / or both sides of the passageway.

[0016] Further preferably, the butterfly door comprises a butterfly door upright provided with a hinged lug plate; a butterfly door crossbeam connected to the upper end of the butterfly door upright, the butterfly door crossbeam being connected to a butterfly door driving cylinder; and an integral bent butterfly door leaf frame connected to the butterfly door upright on the side of the butterfly door crossbeam, the door leaf force column of the butterfly door leaf frame being obliquely arranged with the upper crossbeam of the door leaf, and the two door leaves forming a semi-closed butterfly door assembly when closed.

[0017] Further preferably, the door leaf force column of the butterfly door leaf frame forms an angle of 130-140 degrees with the upper crossbeam of the door leaf.

[0018] Further preferably, the sorting door comprises a sorting door upright provided with a hinged lug plate; a sorting door crossbeam connected to the upper end of the sorting door upright, the sorting door crossbeam being connected to a sorting door driving cylinder; and a sorting door leaf frame connected to the sorting door upright on the side of the sorting door crossbeam; the sorting door leaf frame comprising a cattle blocking frame connected to the sorting door upright and a cattle head avoiding frame located above the cattle blocking frame, the horizontal length of the cattle blocking frame being greater than the length of the cattle head avoiding frame, and the cattle head avoiding frame being connected to the sorting door upright and the sorting door crossbeam.

[0019] Further preferably, the outer frame of the cattle head avoiding frame is obliquely arranged with the upper frame of the cattle blocking frame, and the lower connecting point of the outer frame of the cattle head avoiding frame is close to 1 / 2 of the upper frame of the cattle blocking frame.

[0020] Further preferably, the lower part of the detection channel and / or the sorting channel is provided with a cattle guiding limiting frame.

[0021] Further preferably, a double-lug door shaft seat is arranged on the portal upright corresponding to the positions of the butterfly door and / or the sorting door, a wear-resistant bushing is arranged in the door shaft seat, and a pin shaft is arranged in the wear-resistant bushing and hinged with the hinged lug plate of the butterfly door and the sorting door.

[0022] The utility model has the advantages and technical effects that the overall technical effects of the utility model are embodied in multiple aspects, and the utility model provides a high-efficiency, friendly and intelligent cattle sorting assembly solution for the cattle farm.

[0023] Firstly, the utility model divides the channel into a cattle entering channel, a detection channel and a sorting channel through the design of the cattle entering channel, realizes the orderly flow of cattle, and the cattle entering channel is responsible for guiding the cattle to enter, the detection channel is provided with photoelectric switches, identifiers and other equipment, can accurately detect the position, size and other characteristics of the cattle, and performs identity recognition, and the sorting channel performs fine sorting on the cattle according to the detection result, improves the accuracy and efficiency of sorting.

[0024] Secondly, the utility model discloses in the passage of the detection and the passage of the group of the combination place of the cattle channel hinged installation of the half closed type butterfly door assembly of the opposite open, and hinged installation of the half closed type group door assembly of the opposite open in the group passage tail part. The design of these doors fully considers the friendliness to the cattle, and the door leaf force column of butterfly door leaf frame is inclined to set with the upper crossbeam of door leaf, forms the half closed structure, can effectively guide the cattle to enter the passage, also avoids the oppression feeling that the cattle is brought about by complete closure. The group door leaf frame includes cattle blocking frame and cattle head avoiding frame, ensures the blocking effect, also provides sufficient space for the cattle head, avoids the situation that the cattle head is stuck. In addition, the angle of the two butterfly doors and group doors controlled by pneumatic control box when closing is about 45 degrees or 135 degrees, can resist the collision when the cattle advances more, is higher in stability, guarantees the safety and comfort of the cattle at the same time.

[0025] Furthermore, the utility model discloses in the passage of the detection and the passage of the group of the combination place of the cattle channel sets up cattle channel urging device, through the combination of inductive switch, time delay relay and blowing device, urges the cattle that stays in the passage to go forward as soon as possible in the gentle way, effectively reduces the stay time of the cattle and the channel congestion phenomenon, improves the group efficiency. Meanwhile, the design of blowing device also considers the blowing range, and both sides in the same channel are equipped with blowing nozzle, so that the urging effect is better.

[0026] In addition, the utility model also realizes the self -selection switching of smooth mode and precision mode through the software of Afijin, and local manual control mode. In smooth mode, butterfly door keeps open state, only when the cattle that need to be grouped is recognized, will be closed automatically, improves the traffic efficiency of the cattle group. In precision mode, every cattle passes through butterfly door and will be closed, realizes the separation of every cattle, guarantees the accuracy of the group.

[0027] Summarized above, the utility model discloses through a series of carefully designed technical scheme, improves the group efficiency of the cattle farm, cattle welfare and management level, provides powerful support for the intelligent, efficient development of modern dairy farming. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the whole structure schematic diagram of the utility model;

[0029] Figure 2 It is butterfly door structure schematic diagram;

[0030] Figure 3 It is group door structure schematic diagram;

[0031] Figure 4 It is Figure 1 The enlarged view of part I in it;

[0032] Figure 5 It is the reference diagram of the utility model in use state.

[0033] Fig. 10, cattle access channel; 101, double-ear gate shaft seat; 102, wear-resistant shaft sleeve; 103, pin shaft; 20, detection channel; 30, butterfly gate assembly; 31, butterfly gate; 310, butterfly gate upright; 311, hinged lug plate; 312, butterfly gate crossbeam; 313, butterfly gate leaf frame; 32, butterfly gate driving cylinder; 40, grouping channel; 401, grouping gate assembly; 41, grouping gate; 410, grouping gate upright; 411, hinged lug plate; 412, grouping gate crossbeam; 413, cattle blocking frame; 414, cattle head avoiding frame; 42, grouping gate driving cylinder; 50, air blowing device; 51, air pipe; 52, air blowing nozzle; 60, cattle guiding limiting frame. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model is further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and do not limit the utility model.

[0035] Please refer to Figures 1 to 4 A kind of animal-friendly cattle grouping assembly for cattle farm, the cattle access channel, the cattle access channel is divided into cattle access channel 10, detection channel 20 and grouping channel 40 along the direction of cattle walking, the orderly flow of cattle is realized. Cattle access channel is responsible for guiding cattle to enter,

[0036] Photoelectric switch for detecting the position of cattle, etc. Characteristic, and identifier and other equipment for carrying out cattle identity recognition are installed in detection channel, and grouping channel carries out fine grouping to cattle according to detection result.

[0037] The hinge installation of the entrance channel and the detection channel combination half-closed butterfly door assembly 30, the half-closed butterfly door assembly of each butterfly door 31 is connected with a butterfly door driving cylinder 32; the tail of the group channel is hingedly installed with a half-closed group door assembly 401; each group door 41 of the half-closed group door assembly is connected with a group door driving cylinder 42, and the butterfly door driving cylinder and the group door driving cylinder are connected with a pneumatic control box; the angle of the two butterfly doors and the group doors is about 45° when the pneumatic control box controls the closing angle, which can better resist the impact of the cattle when advancing, has higher stability, and can ensure that the two group doors will not pinch the cattle and will not collide with each other to produce sound and cause the cattle to have stress reaction; the half-closed group door design avoids the cattle head from being stuck when closing; at least a cattle channel urging device 50 is arranged at the joint of the detection channel and the group channel. The device can effectively urge the cattle in the channel to walk forward as soon as possible, avoid the channel congestion caused by the cattle staying, improve the group efficiency; at the same time, the use of the urging device reduces the need for manual intervention and reduces the labor intensity of the feeders; in addition, the design of the device takes into account the habits of the cattle, and the cattle are urged to walk forward in a gentle way, which reduces the stress reaction of the cattle and is beneficial to maintaining the health and production performance of the cattle.

[0038] Further preferably, the cattle channel urging device comprises an inductive switch arranged in the cattle channel for detecting the staying time of the cattle in the channel;

[0039] A delay relay is electrically connected with the inductive switch and is triggered and gives a signal when the inductive switch detects that the staying time of the cattle exceeds a preset threshold;

[0040] A blowing device 50 is connected with a gas source through a gas pipe and receives the signal of the delay relay, and blows air to the cattle staying in the channel to urge the cattle to walk forward as soon as possible when the signal is received.

[0041] Further preferably, the blowing device comprises a gas valve (not shown in the figure) connected with the gas source through a gas pipe 51 for receiving the gas from the gas source;

[0042] The control input end of the gas valve is connected with the output end of the delay relay for receiving the control signal output by the delay relay;

[0043] A blowing nozzle 52 is arranged in the cattle channel and connected with the output end of the gas valve, and when the gas valve receives the control signal, the blowing nozzle is opened and blows the gas to the cattle staying in the channel to urge the cattle to walk forward as soon as possible.

[0044] Further preferably, the blowing nozzles can be arranged at one, in the middle of the channel, or on both sides of the channel, or in the middle and on both sides of the channel. This technical feature makes the blowing range wider, and the effect of prompting the cattle to move forward better, effectively reducing the cattle staying time, improving the channel passing efficiency and group separation efficiency.

[0045] Further preferably, the butterfly door 31 comprises a butterfly door stand 310, which is provided with a hinged lug plate 311; a butterfly door beam 312 connected to the upper end of the butterfly door stand, which connects the butterfly door driving cylinder 32; the butterfly door stand is connected to an integral bent butterfly door leaf frame 313 on the side of the butterfly door beam, and the door leaf force column of the butterfly door leaf frame is obliquely arranged with the upper beam of the door leaf, and after the two butterfly doors are closed, the lower part is closed and the upper part is open, forming a semi-closed butterfly door assembly. This technical scheme realizes the friendly management of the cattle by carefully designing the structure of the butterfly door. The arrangement of the butterfly door stand and the hinged lug plate ensures the flexible opening and closing of the door. The butterfly door beam connects the driving cylinder, making the operation of the door more convenient. In particular, the door leaf force column of the butterfly door leaf frame is obliquely arranged with the upper beam of the door leaf, and after the two butterfly doors are closed, a semi-closed structure with a closed lower part and an open upper part is formed. This design can effectively guide the cattle into the channel, and also avoids the oppression of complete closure to the cattle, reduces the stress reaction of the cattle, embodies the friendliness and care of the cattle, and helps to improve the overall operation efficiency of the ranch and the welfare of the cattle.

[0046] Further preferably, the door leaf force column of the butterfly door leaf frame forms an angle of 130-140 degrees with the upper beam of the door leaf. This makes the butterfly door leaf frame form a reasonable semi-closed space, which can guide the cattle to enter and avoid the feeling of oppression, effectively reduce the stress of the cattle, and improve the friendliness to the cattle.

[0047] Further preferably, the grouping door 41 comprises a grouping door upright 410, which is provided with a hinged lug plate 411; a grouping door crossbeam 412 connected to the upper end of the grouping door upright, which connects the grouping door driving cylinder 42; a grouping door leaf frame connected to the side of the grouping door crossbeam; the grouping door leaf frame comprises a cow blocking frame 413 connected to the grouping door upright and a cow head avoiding frame 414 located above the cow blocking frame, and the transverse length of the cow blocking frame is greater than the length of the cow head avoiding frame, and the cow head avoiding frame is connected to the grouping door upright and the grouping door crossbeam 412. The technical scheme greatly improves the friendliness to the cow by ingeniously designing the structure of the grouping door. The grouping door upright and the hinged lug plate ensure the stability and flexibility of the door. The grouping door crossbeam connects the driving cylinder, making the operation simple and quick. In particular, the design of the grouping door leaf frame, the cow blocking frame effectively blocks the cow, and the cow head avoiding frame provides sufficient space for the cow head, avoiding the situation that the cow head is stuck. The transverse length of the cow blocking frame is greater than that of the cow head avoiding frame, which ensures the blocking effect and also reflects the careful care for the cow, reduces the stress reaction of the cow, and improves the management level of the ranch and the welfare of the cow.

[0048] Further preferably, the outer frame of the cow head avoiding frame is inclinedly arranged with the upper frame of the cow blocking frame, and the lower connecting point of the outer frame of the cow head avoiding frame is close to 1 / 2 of the upper frame of the cow blocking frame. In the technical scheme, the outer frame of the cow head avoiding frame is inclinedly arranged with the upper frame of the cow blocking frame, and the connecting point is reasonably positioned, effectively avoiding the risk of the cow head being stuck. This design not only ensures the blocking function of the grouping door, but also reflects the friendliness to the cow, reduces the stress reaction of the cow, and improves the operating efficiency of the ranch.

[0049] Further preferably, the lower part of the detection channel and / or the grouping channel is provided with a cow guiding limiting frame 60. The technical scheme effectively guides the cow to walk along the predetermined path, reduces deviation and congestion, improves the channel passing efficiency, reduces the stress reaction of the cow, and reflects the friendly management of the cow.

[0050] Further preferably, the double lug door shaft seat 101 is arranged on the portal upright corresponding to the positions of the butterfly door and / or the grouping door in the cow entering channel, the wear-resistant shaft sleeve 102 is installed in the door shaft seat, and the pin shaft 103 is arranged in the wear-resistant shaft sleeve and hinged with the hinged lug plate of the butterfly door and the grouping door. The technical scheme arranges the double lug door shaft seat on the portal upright of the cow entering channel, and is equipped with the wear-resistant shaft sleeve and the pin shaft, which are hinged with the hinged lug plate of the butterfly door and the grouping door. This design enhances the stability and durability of the door, reduces wear caused by frequent opening and closing, ensures the smoothness of the door shaft operation. At the same time, it also improves the flexibility and reliability of the opening and closing of the butterfly door and the grouping door, providing a strong guarantee for the efficient operation of the ranch.

[0051] Please refer toFigure 5 The cattle grouping assembly described above can adopt a local manual control mode, remote remote control, and can also realize self-selection switching of a flow (Flow) mode and an accurate (Accurate) mode through Afifarm software independent research and development (for example, Afifarm 5.4 version and above). The flow (Flow) mode refers to the state of keeping the butterfly door open. Only when the grouping code of the cattle to be grouped is identified, the butterfly door will automatically close. In this mode, most of the cattle can pass freely and will not be disturbed and stressed. Only when the cattle to be grouped are identified, the butterfly door will act, so that the cattle passing efficiency is high, and the passing speed can reach 15 heads / minute. The accurate (Accurate) mode is that the butterfly door is closed when each cattle passes through the butterfly door. The accurate mode realizes the separation of each cattle. The advantages are that the separation is accurate and will not make mistakes. The disadvantage is that the passing efficiency is relatively slow, and the passing speed is generally 12 heads / minute.

[0052] In summary, the utility model improves the grouping efficiency of the cattle farm, the cattle welfare and the management level through a series of carefully designed technical schemes, and provides strong support for the intelligent and efficient development of the modern dairy farming industry. The above is only a preferred embodiment of the utility model, and is not used to limit the utility model. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A cattle-friendly cow grouping assembly for a cattle ranch, characterized by: The cattle entering channel is divided into a cattle entering channel, a detection channel and a group dividing channel along the direction of cattle walking; A pair of half-closed butterfly door assemblies are hingedly installed at the joint of the cattle entering channel and the detection channel, each butterfly door of the butterfly door assembly is connected with a butterfly door driving cylinder; a pair of half-closed group dividing door assemblies are hingedly installed at the tail of the group dividing channel; each group dividing door of the group dividing door assembly is connected with a group dividing door driving cylinder, the butterfly door driving cylinder and the group dividing door driving cylinder are connected with a pneumatic control box; and a cattle channel urging device is arranged at least at the joint of the detection channel and the group dividing channel.

2. The animal friendly cattle grouping assembly for use in a cattle farm as claimed in claim 1, wherein: The cattle channel urging device comprises an inductive switch arranged in the cattle channel and used for detecting the staying time of the cattle in the channel; A time delay relay is electrically connected with the inductive switch and is triggered and gives a signal when the inductive switch detects that the staying time of the cattle exceeds a preset threshold value; A blowing device is connected with a gas source through a gas pipe and receives the signal of the time delay relay, and blows air to the cattle staying in the channel to urge the cattle to walk forward as soon as possible when the signal is received.

3. The animal friendly cattle grouping assembly for use in a cattle farm according to claim 2, characterized in that: The blowing device comprises a gas valve connected with the gas source through the gas pipe and used for receiving the gas from the gas source; The control input end of the gas valve is connected with the output end of the time delay relay and is used for receiving the control signal output by the time delay relay; A blowing nozzle is arranged in the cattle channel and connected with the output end of the gas valve, and the gas valve is opened and blows the gas to the cattle staying in the channel through the blowing nozzle to urge the cattle to walk forward as soon as possible when the control signal is received.

4. The animal friendly cattle grouping assembly for use in a cattle farm according to claim 3, characterized in that: The blowing nozzles are arranged in the middle and / or both sides of the channel.

5. The animal friendly cattle grouping assembly for use in a cattle farm as claimed in claim 1, wherein: The butterfly door comprises a butterfly door stand column, a hinged lug plate is arranged on the butterfly door stand column; a butterfly door cross beam is connected to the upper end of the butterfly door stand column, the butterfly door cross beam is connected with the butterfly door driving cylinder; an integral bent butterfly door frame is connected to the butterfly door stand column at the side of the butterfly door cross beam, the door leaf force column of the butterfly door frame and the door leaf upper cross beam are arranged obliquely, and two butterfly doors are closed to form a half-closed butterfly door assembly.

6. The animal friendly cattle grouping assembly for use in a cattle farm according to claim 5, characterized in that: The door leaf force column of the butterfly door frame and the door leaf upper cross beam form an included angle of 130-140 degrees.

7. The animal friendly cattle grouping assembly for use in a cattle farm as claimed in claim 1, wherein: The group dividing door comprises a group dividing door stand column, a hinged lug plate is arranged on the group dividing door stand column; a group dividing door cross beam is connected to the upper end of the group dividing door stand column, the group dividing door cross beam is connected with the group dividing door driving cylinder; a group dividing door frame is connected to the group dividing door stand column at the side of the group dividing door cross beam; the group dividing door frame comprises a cattle blocking frame connected with the group dividing door stand column and a cattle head avoiding frame located above the cattle blocking frame, the horizontal length of the cattle blocking frame is greater than the length of the cattle head avoiding frame, and the cattle head avoiding frame is connected with the group dividing door stand column and the group dividing door cross beam.

8. The animal friendly cattle grouping assembly for use in a cattle farm according to claim 7, characterized in that: The outer frame of the cattle head avoiding frame and the upper frame of the cattle blocking frame are arranged obliquely, and the lower connection point of the outer frame of the cattle head avoiding frame is close to 1 / 2 of the upper frame of the cattle blocking frame.

9. The animal friendly cattle grouping assembly for use in a cattle farm as claimed in claim 1, wherein: A cattle guiding limiting frame is arranged at the lower part of the detection channel and / or the group dividing channel.

10. The animal friendly cattle grouping assembly for use in a cattle farm according to claim 5 or 7, characterized in that: The double-ear door shaft seat is arranged on the portal column at the position of the butterfly door and / or the group door, a wear-resistant shaft sleeve is arranged in the door shaft seat, and a pin shaft is arranged in the wear-resistant shaft sleeve and is hinged with the hinge ear plate of the butterfly door and the group door.

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