Precise feeding vehicle for sheep fattening premix

Abstract

The utility model relates to the technical field of livestock breeding equipment, and discloses an accurate feeding vehicle for sheep fattening premix, which is characterized in that a plurality of wheels for moving are fixedly mounted at the lower end of a frame, wheels for controlling are fixedly mounted at the front half part of the upper surface of the frame, and a fixed base is fixedly mounted at the side end, corresponding to the wheels, of the upper surface of the frame; the storage tank for storage is fixedly mounted at the upper end of the fixed base, the feed port for feeding is fixedly mounted on the upper surface of one end of the storage tank, and premix can be uniformly and continuously conveyed to the discharge port from the storage tank through driving of the motor and rotation of the spiral blade, so that the quantity of the premix fed each time is ensured to be accurate; the sensor monitors the position and the state of the containing box in real time, it is ensured that premix is fed at the correct time and position, waste and mistaken feeding are avoided, the utilization rate of the premix is increased, the feeding amount of the premix can be accurately controlled by adjusting the rotating speed of the motor and the transmission ratio of the rotating structure, and the fattening requirements of different sheep are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of livestock breeding equipment, and specifically to a sheep fattening premix precise feeding vehicle. BACKGROUND

[0002] In the livestock industry, the fattening process of sheep is crucial to improving breeding efficiency. Premix, as an important source of nutrition in the fattening process of sheep, directly affects the growth rate and health status of sheep. However, the traditional premix feeding method mostly relies on manual operation, which is not only inefficient but also difficult to ensure the accuracy and uniformity of feeding, leading to waste of premix and instability of sheep fattening effect.

[0003] To solve the above problems, some automated equipment has been proposed and applied in the livestock industry. For example, a Chinese patent proposes an automatic unloading concrete mixer truck (patent publication number CN217802477U). This patent designs an automatic unloading system to achieve automatic unloading and mixing of concrete, greatly improving work efficiency. However, the above patent only solves the problem of automatic unloading and mixing of concrete and does not specifically design for the precise feeding of sheep fattening premix. In the sheep fattening process, the feeding amount, feeding position, and feeding time of premix need to be strictly controlled to ensure that sheep can obtain balanced nutrition intake, thereby achieving the best fattening effect. At the same time, existing automatic unloading equipment often has complex structure, cumbersome operation, high energy consumption, and environmental pollution problems. Some equipment is prone to dust scattering during unloading, which not only pollutes the environment but also may harm the health of operators. At the same time, due to the complex structure of the equipment, the maintenance and maintenance cost is relatively high, which is not conducive to the widespread application in the livestock industry. Therefore, we propose a sheep fattening premix precise feeding vehicle, CONTENT OF THE UTILITY MODEL

[0004] (I) Technical problem solved

[0005] In view of the deficiencies of the prior art, the utility model provides a sheep fattening premix precise feeding vehicle, which solves the above problems.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme: a sheep fattening premix precise feeding vehicle, including frame, the lower end fixed mounting of frame a plurality of for moving wheel, the upper surface half part of frame fixed mounting for controlling wheel, and the upper surface fixed mounting fixed base of frame corresponds the side end of wheel, the upper end fixed mounting of fixed base for storage storage tank, the upper surface of one end of storage tank fixed mounting for feeding feeding inlet, the lower half part fixed mounting of other end of feeding inlet for discharging discharge port, the lower end of discharge port is provided with the placing box for placing, still include:

[0008] Rotary assembly, install in the inside of frame, for controlling the structure that placing box carries out rotation.

[0009] Preferably, the inside center of the storage tank is provided with a main shaft, the main shaft penetrates the surface of the storage tank and is connected with the control panel, and a spiral blade for rotation is fixedly installed on the surface of the main shaft.

[0010] Preferably, the rotary assembly comprises a motor, a rotating shaft, a driving gear, a driven wheel and a connecting shaft, one end of the motor is connected with the rotating shaft, the other end of the rotating shaft extends to the inside of the frame and is connected with the center of the driving gear, the side end of the driving gear is engaged with the driven wheel, and the center of the driven wheel is fixedly installed with the connecting shaft.

[0011] Preferably, the upper surface of the frame is fixedly installed with a base for supporting at one end, and the connecting shaft penetrates the base and is connected with the top disc at the upper end.

[0012] Preferably, the side end of the top disc is fixedly installed with four connecting rods, the other end of the connecting rod is fixedly installed with a fixed frame, the placing box is installed in the inside of the fixed frame through hinging, four placing boxes are arranged correspondingly, and a sensor is arranged on the surface of one end of the storage tank corresponding to the position of the placing box.

[0013] Preferably, the upper half of the surface of the rotating shaft is sleeved with an auxiliary gear, the side end of the auxiliary gear is engaged with a linkage gear, a first movable shaft for connection is fixedly installed on the surface of the inner end of the linkage gear, the other end of the first movable shaft is fixedly installed with an auxiliary rod, the other end of the auxiliary rod is connected with a second movable shaft, the first movable shaft and the second movable shaft are arranged in the same structure, and the second movable shaft is fixedly installed on the surface of the outer end of the rotating disc.

[0014] Preferably, the surface of the inner end of the rotating disc is fixedly installed with a third movable shaft for supporting, the upper end of the third movable shaft is fixedly installed with a two-section rod for connection, the upper surface of the frame is fixedly installed with a circular tube for limiting corresponding to the lower end of the placing box, the upper end of the two-section rod is installed in the inside of the circular tube, and the upper end of the two-section rod is fixedly installed with a protective plate for protection.

[0015] (Three) beneficial effects

[0016] Compared with the prior art, the sheep fattening premix precise feeding vehicle has the following beneficial effects:

[0017] 1. The premix can be uniformly and continuously conveyed from the storage tank to the discharge port through the rotation of the motor drive and the spiral blade, ensuring that the amount of premix fed each time is accurate, the sensor monitors the position and state of the placement box in real time, ensuring that the premix is fed at the correct time and position, avoiding waste and misfeeding, improving the utilization rate of the premix, and through adjustment of the rotation speed of the motor and the transmission ratio of the rotating structure, accurate control of the feeding amount of the premix can be realized, meeting the fattening needs of different sheep.

[0018] 2. The operator only needs to control the control panel to start, stop, adjust the speed and adjust the feeding position of the entire feeding vehicle, reducing the complexity and labor intensity of manual operation, the feeding vehicle adopts a closed structure design, effectively avoiding the scattering and pollution of the premix during feeding, the motor drive system adopts a high-efficiency energy-saving design, reducing energy consumption and noise pollution, and meeting the requirements of modern animal husbandry for environmental protection and sustainable development. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic view of the utility model;

[0020] Figure 2 is a partial schematic view of the utility model;

[0021] Figure 3 is a schematic view of the rotating assembly of the utility model;

[0022] Figure 4 is a schematic view of the side end of the rotating assembly of the utility model.

[0023] In the drawing: 1, vehicle frame; 2, wheel; 3, control panel; 4, storage tank; 5, inlet; 6, fixed base; 7, spiral blade; 8, discharge port; 9, sensor; 10, placement box; 11, fixed frame; 12, connecting rod; 13, top disc; 14, connecting shaft; 15, base; 16, driven wheel; 17, drive gear; 18, rotating shaft; 19, motor; 20, auxiliary gear; 21, linkage gear; 22, No. 1 movable shaft; 23, auxiliary rod; 24, No. 2 movable shaft; 25, rotating disc; 26, No. 3 movable shaft; 27, double-section rod; 28, round pipe. DETAILED DESCRIPTION

[0024] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts under the premise that no creative efforts are made, belong to the scope of protection of the present application.

[0025] Please refer to Figures 1-4 The utility model provides a kind of sheep fattening premix precision feeding vehicle, including frame 1, the lower end of frame 1 is fixedly installed multiple for moving wheel 2, the upper surface of frame 1 front half is fixedly installed for controlling wheel 2, and the upper surface of frame 1 is fixedly installed fixed pedestal 6 to the side end corresponding wheel 2, the upper end of fixed pedestal 6 is fixedly installed for storing storage tank 4, the upper surface of one end of storage tank 4 is fixedly installed for feeding inlet 5, the lower half of the other end of inlet 5 is fixedly installed for discharging discharge port 8, the lower end of discharge port 8 is provided with for placing placing box 10, further comprising: rotating assembly, it is installed in the inside of frame 1, for the structure of controlling placing box 10 to rotate, the rotation of screw blade 7 is driven by control panel 3, premix can be uniformly, continuously from storage tank 4 to discharge port, ensure that the amount of premix of each feeding is accurate, placing box 10 is rotated by rotating assembly control, sensor 9 determines the position of placing box 10 and then feeds.

[0026] Further, the inside center of storage tank 4 is installed main shaft, main shaft penetrates the surface of storage tank 4 and is connected with control panel 3, and the surface of main shaft is fixedly installed with for rotating screw blade 7, main shaft drives the screw blade 7 in storage tank 4 to start rotating, and premix is transported from one end of storage tank 4 to the other end, when premix is transported to discharge port 8, premix is smoothly discharged due to the pushing action of screw blade 7.

[0027] Further, rotating assembly includes motor 19, shaft 18, driving gear 17, driven wheel 16 and connecting shaft 14, one end of motor 19 is connected with shaft 18, the other end of shaft 18 extends to the inside of frame 1 and is connected with the center of driving gear 17, the side end of driving gear 17 is engaged with driven wheel 16, and the center of driven wheel 16 is fixedly installed with connecting shaft 14, motor 19 drives driving gear 17 to rotate through shaft 18, driving gear 17 drives engaged driven wheel 16 to rotate synchronously when rotating, driven wheel 16 drives connecting shaft 14 to rotate when rotating, and connecting shaft 14 drives entire fixed frame 11 to rotate through top plate 13.

[0028] Further, the upper surface of frame 1 is fixedly installed with base 15 for supporting, and connecting shaft 14 upper end penetrates base 15 and is connected with top disc 13, and base 15 supports top disc 13 as support point.

[0029] Further, the side end of the top disc 13 is fixedly installed with four connecting rods 12, the other end of the connecting rod 12 is fixedly installed with a fixed frame 11, the inside of the fixed frame 11 is installed with a placing box 10 through hinged installation, four placing boxes 10 are arranged correspondingly, and the sensor 9 is arranged on the surface of one end of the storage tank 4 corresponding to the position of the placing box 10. When the rotating shaft 18 rotates, the reverse auxiliary gear 20 rotates, the auxiliary gear 20 rotates to drive the linkage gear 21 to rotate. When the linkage gear 21 rotates, the first movable shaft 22 continuously changes the position with the rotation of the linkage gear 21, and the second movable shaft 24 moves synchronously with the first movable shaft 22 through the auxiliary rod 23. The second movable shaft 24 drives the rotating disc 25 to rotate.

[0030] Further, the upper half surface of the rotating shaft 18 is sleeved with the auxiliary gear 20, and the side end of the auxiliary gear 20 is engaged with the linkage gear 21. The inside of the linkage gear 21 is fixedly installed with the first movable shaft 22 for connection, the other end of the first movable shaft 22 is fixedly installed with the auxiliary rod 23, the other end of the auxiliary rod 23 is connected with the second movable shaft 24, the first movable shaft 22 and the second movable shaft 24 are arranged in the same structure, and the second movable shaft 24 is fixedly installed on the outside of the rotating disc 25.

[0031] Further, the inside of the rotating disc 25 is fixedly installed with the third movable shaft 26 for support, the upper end of the third movable shaft 26 is fixedly installed with the two-section rod 27 for connection, the upper surface of the frame 1 is fixedly installed with the circular tube 28 for limiting at the lower end corresponding to the placing box 10, the upper end of the two-section rod 27 is installed in the inside of the circular tube 28, the upper end of the two-section rod 27 is fixedly installed with the protective plate for protection. When the rotating disc 25 rotates, the third movable shaft 26 rotates, the third movable shaft 26 makes a circular motion with the center of the rotating disc 25 as the center point, the two-section rod 27 moves synchronously along the track of the third movable shaft 26, the circular tube 28 is fixed at one end of the frame 1, the upper half of the two-section rod 27 is limited by the circular tube 28, so that the upper half of the two-section rod 27 keeps horizontal up and down movement track, and the upper end of the two-section rod 27 pushes out the upper half of the placing box 10.

[0032] Structure description 1, frame: the frame is the main supporting structure of the whole sheep fattening premix precise feeding vehicle, which is made of solid and durable materials to ensure the stability and durability of the whole equipment. The frame is designed reasonably, which is convenient for the installation and connection of various parts, and is convenient for moving and operating.

[0033] 2, wheel: the wheel is installed at the bottom of the frame, which is used to realize the movement and steering of the feeding vehicle. The wheel is made of wear-resistant material, which has good load-bearing capacity and driving stability, and can ensure the smooth running of the feeding vehicle on various terrains.

[0034] 3. Control panel: The control panel is the operation interface of the delivery vehicle, installed at a convenient operation position of the vehicle frame. The control panel is provided with start, stop, speed adjustment and delivery position adjustment buttons or knobs. The operator can realize overall control of the entire delivery vehicle through the control panel.

[0035] 4. Storage tank: The storage tank is installed on the vehicle frame and used for storing premix. The storage tank is designed to be sealed to prevent the premix from being damp or contaminated. The capacity of the storage tank is moderate, which can meet the demand of one-time delivery and is convenient for cleaning and maintenance.

[0036] 5. Inlet: The inlet is located at the top or side of the storage tank, which is convenient for the operator to add premix into the storage tank. The inlet is designed reasonably to ensure that the premix can enter the storage tank smoothly and prevent impurities from entering.

[0037] 6. Fixed base: The fixed base is installed on the vehicle frame and used for fixing the storage tank and motor and other components. The fixed base is designed stably to ensure that the components will not loosen or shift during operation.

[0038] 7. Spiral blade: The spiral blade is installed in the storage tank and connected with the main shaft. When the main shaft rotates, the spiral blade rotates to transport the premix from one end to the other end of the storage tank. The design of the spiral blade ensures uniform transportation and accurate delivery of the premix.

[0039] 8. Outlet: The outlet is located at the bottom or side of the storage tank and connected with the spiral blade. When the premix is transported to the outlet, it is smoothly discharged due to the pushing action of the spiral blade. The outlet is designed reasonably to ensure that the premix can accurately fall into the placement box.

[0040] 9. Sensor: The sensor is installed at a proper position of the delivery vehicle and used for real-time monitoring of the position and state of the placement box. The sensor can accurately detect the position and inclination angle of the placement box to ensure that the premix is delivered at the correct time and position.

[0041] 10. Placement box: The placement box is installed with the fixed frame through a hinge and used for receiving the premix discharged from the outlet. The placement box is designed reasonably to facilitate handling and cleaning and ensure that the premix will not scatter or contaminate during delivery.

[0042] 11. Fixed frame: The fixed frame is installed on the vehicle frame and used for supporting and fixing the placement box. The fixed frame is designed stably to ensure the stability and safety of the placement box during delivery.

[0043] 12. Connecting rod: The connecting rod is used to connect the fixed frame and the top plate and other components to ensure the stability and reliability of the entire rotating structure.

[0044] 13. Top plate: The top plate is installed above the connecting shaft and connected to the fixed frame through connecting rods. The design of the top plate helps to maintain the balance and stability of the rotating structure;

[0045] 14. Connecting shaft: The connecting shaft is an important component of the rotating structure, used to connect the driven wheel and the top plate, etc. The reasonable design of the connecting shaft can ensure the smooth operation of the rotating structure;

[0046] 15. Base: The base is installed at the bottom of the vehicle frame and is used to support the entire delivery vehicle. The stable design of the base can ensure the stability and safety of the delivery vehicle during operation;

[0047] 16. Driven wheel: The driven wheel is engaged with the drive gear to realize the rotation of the rotating structure. The reasonable design of the driven wheel can ensure smooth engagement and transmission with the drive gear;

[0048] 17. Drive gear: The drive gear is installed on the shaft and is driven by the motor to rotate. The reasonable design of the drive gear can engage with the driven wheel and drive the entire rotating structure to rotate;

[0049] 18. Shaft: The shaft is the output shaft of the motor, used to transmit the torque and speed of the motor. The reasonable design of the shaft can ensure that the torque and speed of the motor are stably transmitted to the drive gear;

[0050] 19. Motor: The motor is the power source of the entire delivery vehicle, used to drive the main shaft and the rotating structure to rotate. The motor adopts high-efficiency and energy-saving design, reducing energy consumption and noise pollution, meeting the requirements of modern animal husbandry for environmental protection and sustainable development;

[0051] 20. Auxiliary gear: The auxiliary gear is installed on the shaft and engaged with the linkage gear to realize the reverse function of the rotating structure. The reasonable design of the auxiliary gear can ensure smooth engagement and transmission with the linkage gear;

[0052] 21. Linkage gear: The linkage gear is engaged with the auxiliary gear to drive the first movable shaft to rotate. The reasonable design of the linkage gear can ensure smooth engagement and transmission with the auxiliary gear, and can also drive the first movable shaft to move accurately;

[0053] 22. First movable shaft: The first movable shaft is connected with the linkage gear and changes position continuously with the rotation of the linkage gear. The reasonable design of the first movable shaft can ensure smooth connection and transmission with the linkage gear, and can also drive the second movable shaft to move synchronously;

[0054] 23. Auxiliary rod: The auxiliary rod is used to connect the first movable shaft and the second movable shaft to ensure their synchronous movement. The reasonable design of the auxiliary rod can ensure smooth connection and transmission between the first movable shaft and the second movable shaft.

[0055] 24, the second movable shaft: the second movable shaft is connected with the rotating disc, rotates with the movement of the first movable shaft, the design of the second movable shaft is reasonable, can ensure the smooth connection and transmission with the rotating disc, and can drive the rotating disc to rotate accurately;

[0056] 25, the rotating disc: the rotating disc is installed above the second movable shaft, used to drive the third movable shaft to rotate, the design of the rotating disc is reasonable, can ensure the smooth connection and transmission with the second movable shaft, and can drive the third movable shaft to move accurately;

[0057] 26, the third movable shaft: the third movable shaft moves in a circular motion with the center of the rotating disc as the center, and drives the double link rod to move, the design of the third movable shaft is reasonable, can ensure the smooth connection and transmission with the rotating disc, and can drive the double link rod to move accurately;

[0058] 27, double link rod: one end of the double link rod is connected with the third movable shaft, and the other end is connected with the placing box, used to eject the upper half of the placing box, the design of the double link rod is reasonable, can ensure the smooth connection and transmission with the third movable shaft, and can ensure the stability and safety of the placing box during the ejection process;

[0059] 28, the circular pipe: the circular pipe is fixed at one end of the frame, used to limit the upper half of the double link rod, ensure that the double link rod keeps horizontal up and down movement track during movement, the design of the circular pipe is reasonable, can ensure the stability and accuracy of the double link rod during movement.

[0060] Working principle: premix is added into the storage tank 4 through the inlet 5, the operator controls the spindle to rotate through the control panel 3, the spindle drives the spiral blade 7 in the storage tank 4 to start rotating, the premix is transported from one end to the other end of the storage tank 4, when the premix is transported to the discharge port 8, due to the pushing action of the spiral blade 7, the premix is smoothly discharged, at the same time when the premix is discharged, the motor 19 rotates, the motor 19 drives the driving gear 17 to rotate through the rotating shaft 18, the driving gear 17 drives the meshing driven wheel 16 to rotate synchronously when rotating, the driven wheel 16 drives the connecting shaft 14 to rotate when rotating, the connecting shaft 14 drives the whole fixed frame 11 to rotate through the top plate 13, the placing box 10 is installed with the fixed frame 11 through the hinge, and then the angle of the placing box 10 is adjusted, the sensor 9 starts to work, detects the position and state of the placing box 10, when the sensor 9 detects that the placing box 10 is in the correct position, the premix falls into the placing box 10 from the discharge port 8, realizes accurate feeding, after the feeding is completed, the motor 19 works, drives the rotating assembly to rotate to the next position, when the placing box 10 moves to the next node, at the same time, the reverse auxiliary gear 20 rotates when the rotating shaft 18 rotates, the auxiliary gear 20 drives the linkage gear 21 to rotate, the linkage gear 21 changes the position of the first movable shaft 22 constantly when rotating, at the same time, the second movable shaft 24 moves synchronously with the first movable shaft 22 through the auxiliary rod 23, the second movable shaft 24 drives the rotating disc 25 to rotate, the rotating disc 25 drives the third movable shaft 26 to rotate when rotating, the third movable shaft 26 makes circular motion with the center of the rotating disc 25 as the center point, the double-link rod 27 moves synchronously along the track of the third movable shaft 26, the circular pipe 28 is fixed at one end of the frame 1, the circular pipe 28 limits the upper half of the double-link rod 27, so that the upper half of the double-link rod 27 keeps the horizontal up-down movement track, the upper end of the double-link rod 27 pushes out the upper half of the placing box 10, the placing box 10 is inclined, and the premix slides along the inclination of the placing box 10.

[0061] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A sheep fattening premix precision feeding vehicle, comprising a vehicle frame (1), a plurality of vehicle wheels (2) for movement are fixedly installed at the lower end of the vehicle frame (1), vehicle wheels (2) for control are fixedly installed on the upper surface of the front half of the vehicle frame (1), and fixed bases (6) are fixedly installed on the side ends of the upper surface of the vehicle frame (1) corresponding to the vehicle wheels (2), storage tanks (4) for storage are fixedly installed on the upper end of the fixed bases (6), material inlets (5) for feeding are fixedly installed on one end of the upper surface of the storage tanks (4), material outlets (8) for discharging are fixedly installed on the other end of the lower half of the material inlets (5), and placing boxes (10) for placing are arranged at the lower end of the material outlets (8), characterized in that, Also include: Rotary assembly, mounted in the inside of the frame (1), for control of the structure of the box (10) to rotate.

2. The sheep fattening premix precise feeding vehicle according to claim 1, characterized in that: The inside center of the storage tank (4) is provided with a main shaft, the main shaft penetrates the surface of the storage tank (4) and is connected with the control panel (3), and the surface of the main shaft is fixedly provided with a spiral blade (7) for rotation.

3. The sheep fattening premix precise feeding vehicle according to claim 1, characterized in that: The rotary assembly includes a motor (19), a rotating shaft (18), a drive gear (17), a driven wheel (16) and a connecting shaft (14), one end of the motor (19) is connected with the rotating shaft (18), the other end of the rotating shaft (18) extends to the inside of the frame (1) and is connected with the center of the drive gear (17), the side end of the drive gear (17) is engaged with the driven wheel (16), and the center of the driven wheel (16) is fixedly provided with the connecting shaft (14).

4. The sheep fattening premix precise feeding vehicle according to claim 3, characterized in that: The upper surface of the frame (1) is fixedly provided with a base (15) for supporting, and the upper end of the connecting shaft (14) penetrates the base (15) and is connected with the top disc (13).

5. The sheep fattening premix precise feeding vehicle according to claim 4, characterized in that: The side end of the top disc (13) is fixedly provided with four connecting rods (12), the other end of the connecting rod (12) is fixedly provided with a fixed frame (11), the inside of the fixed frame (11) is provided with four placing boxes (10) through hinged installation, and the surface of one end of the storage tank (4) is provided with a sensor (9) corresponding to the position of the placing box (10).

6. The sheep fattening premix precise feeding vehicle according to claim 3, characterized in that: The upper half of the surface of the rotating shaft (18) is sleeved with an auxiliary gear (20), and the side end of the auxiliary gear (20) is engaged with a linkage gear (21), the inner end surface of the linkage gear (21) is fixedly provided with a first movable shaft (22) for connection, the other end of the first movable shaft (22) is fixedly provided with an auxiliary rod (23), the other end of the auxiliary rod (23) is connected with a second movable shaft (24), the structure of the first movable shaft (22) and the second movable shaft (24) is the same, and the second movable shaft (24) is fixedly installed on the outer end surface of the rotating disc (25).

7. The sheep fattening premix precision feeding vehicle according to claim 6, characterized in that: The inner end surface of the rotating disc (25) is fixedly provided with a third movable shaft (26) for supporting, the upper end of the third movable shaft (26) is fixedly provided with a double joint rod (27) for connection, the upper surface of the frame (1) is fixedly provided with a circular tube (28) for limiting corresponding to the lower end of the placing box (10), the upper end of the double joint rod (27) is installed in the inside of the circular tube (28), and the upper end of the double joint rod (27) is fixedly provided with a protective plate for protection.

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