Mortar simulator

Abstract

The utility model discloses a mortar simulator which comprises a gun barrel, a pulling and launching device is installed at the bottom of the gun barrel, a sighting telescope inclined support is installed in the middle of the gun barrel, and a high-low frame is installed under the sighting telescope inclined support. The hair pulling device comprises a hair pulling wrench and a hair pulling base which are arranged at the bottom of the gun barrel, a first hair pulling movable block is arranged in the hair pulling base, a pin hole is formed in the lower end of the hair pulling wrench, and the hair pulling wrench, the hair pulling base and the first hair pulling movable block are connected with wrench pins in a penetrating mode; a third hair pulling movable block and a double-torsion spring are installed in the hair pulling base, the hair pulling base, the third hair pulling movable block and the double-torsion spring are connected with a third pin in a penetrating mode, a second pin penetrates through the left side of the hair pulling base, a single-torsion spring is arranged in the first hair pulling movable block, and a first pin penetrates through the middle of the single-torsion spring. A second hair pulling movable block penetrates through the surface of the first pin. The utility model has the characteristic of high simulation degree.

Description

Technical Field

[0001] The utility model relates to the technical field of mortar simulators, in particular to a mortar simulator. Background Technique

[0002] A mortar is a howitzer with a short barrel, which is light and flexible. It uses a base plate to bear the recoil force and mostly uses muzzle loading. It can shoot targets behind shelters. It is widely equipped in the army. When soldiers complete a training, they need to use a lot of equipment, which consumes a lot of funds and reduces the service life of the equipment. Therefore, a mortar simulator appears to replace the mortar device to achieve the purpose of soldiers' training.

[0003] However, most of the current simulation mortars for artillery training lack the sound generated when the shell is fired, and the time required for a single training is long. They are not equipped with a sight or the supporting sight does not have the function of adjusting the accuracy. The high and low legs of the mortar do not have the function of adjusting the height, and the overall simulation degree is not high, resulting in poor training effects and a large difference from actual equipment training.

[0004] Therefore, it is necessary to design a mortar simulator with high simulation degree. Content of the Utility Model

[0005] The purpose of the utility model is to provide a mortar simulator to solve the problems put forward in the above background technique.

[0006] To solve the above technical problems, the utility model provides the following technical scheme: a mortar simulator, including a gun barrel, a pull firing device is installed at the bottom of the gun barrel, a sight tilting bracket is installed in the middle of the gun barrel, a high and low bracket is installed directly below the sight tilting bracket, the pull firing device is provided with a pull firing wrench and a pull firing base at the bottom of the gun barrel, a pull firing movable block one is arranged inside the pull firing base, a pin hole is arranged at the lower end of the pull firing wrench, a wrench pin penetrates through the pull firing wrench, the pull firing base and the pull firing movable block one, a pull firing movable block three and a double torsion spring are installed inside the pull firing base, a pin three penetrates through the pull firing base, the pull firing movable block three and the double torsion spring, and a pin two penetrates through the left side of the pull firing base.

[0007] According to the above technical scheme, a single torsion spring is arranged inside the pull firing movable block one, a pin one penetrates through the middle of the single torsion spring, the pin one also penetrates through a pull firing movable block two, the pull firing movable block two is installed below the pull firing movable block three, and the pin one sequentially penetrates through the pull firing movable block one, the pull firing movable block two and the single torsion spring.

[0008] According to the above technical scheme, a gun barrel window is opened at the lower end of the outer surface of the gun barrel, and a simulated shell is placed at the gun barrel window.

[0009] According to the above technical solution, the sight tilting bracket includes a sight base, a lower retaining hoop, a torsion spring, and a sight bracket. A concentric hole is provided on one side of the lower retaining hoop close to the sight base. An arc notch is formed on the shaft at the front section of the sight bracket. The sight bracket passes through the torsion spring and is fixed on the concentric hole. Both ends of the torsion spring are respectively fixed on the lower retaining hoop and the sight bracket, and there is a torsional force maintained. The sight base is installed between the concentric holes. The sight bracket passes through the torsion spring, the lower retaining hoop, and the sight base at the same time, and the four are connected to each other. A knurled hand-tightening screw one and a cross-recessed pan head screw are installed on the sight base. The cross-recessed pan head screw fits with the arc notch of the sight bracket. A knurled hand-tightening screw two is installed at the bottom of the sight bracket.

[0010] According to the above technical solution, the elevation bracket includes a middle shaft tube seat assembly. A holeless middle shaft tube seat, a main gear, a holed middle shaft tube seat, a bearing, a gland, and an elevation crank assembly are sequentially connected to the middle shaft tube seat assembly. The holeless middle shaft tube seat is threadedly connected to the middle shaft tube seat assembly. The main gear is installed inside the middle shaft tube seat assembly. The main gear passes through the holed middle shaft tube seat and is locked with a nut. The bearing is pressed by the gland in the holed middle shaft tube seat. The elevation crank assembly is installed outside the gland. The elevation crank assembly is connected to the main gear through an expansion pin.

[0011] According to the above technical solution, an up-down transmission lead screw is connected below the middle shaft tube seat assembly. The up-down transmission lead screw is sequentially connected through a secondary gear, an up-down transmission nut, a copper sleeve, a clamping ring, a plain bearing, a tail pipe cap, and a nylon guide sleeve. The secondary gear and the up-down transmission nut are screwed together with screws and are screwed on the up-down transmission lead screw. The copper sleeve is installed at the bottom of the up-down transmission nut with a clearance fit between them. The plain bearing is installed at the bottom of the copper sleeve. The tail pipe cap is installed outside the plain bearing. The tail pipe cap is threadedly connected to the middle shaft tube seat assembly. The clamping ring is threadedly connected to the middle shaft tube seat assembly. The nylon guide sleeve is installed with an "O-ring" and is connected to the up-down transmission lead screw through an expansion pin. A left-right sliding connector is installed at the top of the up-down transmission lead screw. The left-right sliding connector is connected to the up-down transmission lead screw through an expansion pin.

[0012] According to the above technical solution, a tail pipe assembly is provided at the bottom of the tail pipe cap. The tail pipe assembly is threadedly connected to the tail pipe cap.

[0013] According to the above technical solution, the high-low rack is provided with a set of support leg components and a set of buckles. The set of buckles are snap-connected to the outer surface of the central axis pipe seat component. The tops of the set of support leg components are respectively supported and connected to the opposite side surfaces of the central axis pipe seat component through the buckles at their upper ends. A hook handle component is installed in the middle of each support leg component. The hook handle component is slidably connected to the support leg component, and the tail pipe component is pin-connected to the hook handle component.

[0014] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows:

[0015] (1) By providing a hair-pulling device with a continuous firing function and being able to simulate the sound of cannon firing, it restores the operation steps of firing cannonballs during the training of actual equipment and simulates the sound of cannon firing, improving the simulation degree of the simulator, and the continuous firing function improves the training efficiency;

[0016] (2) By providing a simulated cannonball and a cannon barrel window, it can quickly change ammunition, improving the training efficiency;

[0017] (3) By providing a sight tilting bracket, it restores the operation steps of adjusting the sight tilting bracket during the training of actual equipment, strengthening the simulation degree of the simulator;

[0018] (4) By providing a high-low rack, it restores the operation steps of adjusting the cannon barrel during the training of actual equipment, improving the simulation degree of the simulator. Description of the Drawings

[0019] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0020] Figure 1 is the overall schematic diagram of the present utility model;

[0021] Figure 2 is the present utility model Figure 1 right-side overall schematic diagram;

[0022] Figure 3 Overall structural schematic diagram of the hair-pulling device of the present utility model;

[0023] Figure 4 Split structural schematic diagram of the hair-pulling device of the present utility model;

[0024] Figure 5 is the overall structural schematic diagram of the sight tilting bracket of the present utility model;

[0025] Figure 6 is the split structural schematic diagram of the sight tilting bracket of the present utility model;

[0026] Figure 7 is the overall structural schematic diagram of the high-low rack of the present utility model;

[0027] Figure 8 is the split structural schematic diagram of the high-low rack of the present utility model;

[0028] In the figure: 1. Simulated shell; 2. Gun barrel window;

[0029] 3. Pulling device; 301. Pulling wrench; 302. First pulling movable block; 303. Single torsion spring; 304. First pin; 305. Second pulling movable block; 306. Third pulling movable block; 307. Double torsion spring; 308. Pulling base; 309. Second pin; 310. Third pin; 311. Wrench pin;

[0030] 4. Sight tilting bracket; 401. Sight base; 402. Knurled hand-tightening screw one; 403. Cross recessed pan head screw; 404. Lower hoop; 405. Torsion spring; 406. Sight bracket; 407. Knurled hand-tightening screw two;

[0031] 5. High-low rack; 501. Leg component; 502. Main gear; 503. Buckle; 504. Central shaft tube seat component; 505. Left and right sliding connectors; 506. Central shaft tube seat without hole; 507. Up and down transmission lead screw; 508. Sub-gear; 509. Up and down transmission nut; 510. Copper sleeve; 511. Lock ring; 512. Plain bearing; 513. Tail tube cap; 514. Nylon guide sleeve; 515. Tail tube component; 516. High-low crank component; 517. Gland; 518. Bearing; 519. Central shaft tube seat with hole; 520. Hook handle component;

[0032] 6. Gun barrel. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0034] Please refer to Figure 1 - Figure 2, the present utility model provides a technical solution: a mortar training simulator, which includes a gun barrel 6. A gun barrel window 2 is opened at the lower end of the outer surface of the gun barrel 6. A simulated shell 1 is placed at the gun barrel window 2. The gun barrel window 2 enables the simulated shell 1 to be taken out from the gun barrel window 2. A pull - firing device 3 is installed at the bottom of the gun barrel 6. The pull - firing device 3 can trigger a sound simulating the sound of shell firing. A sight tilting bracket 4 is installed in the middle of the gun barrel 6. The sight tilting bracket 4 is used to adjust the aiming accuracy. A height adjustment bracket 5 is installed directly below the sight tilting bracket 4, which is used to adjust the angle of the gun barrel 6.

[0035] Refer to Figure 3 - Figure 4 , the pull - firing device 3 includes a pull - firing wrench 301 and a pull - firing base 308 arranged at the bottom of the gun barrel 6. A pull - firing movable block one 302 is arranged inside the pull - firing base 308. A pin hole is provided at the lower end of the pull - firing wrench 301. A wrench pin 311 penetrates through the pull - firing wrench 301, the pull - firing base 308, and the pull - firing movable block one 302. A pull - firing movable block three 306 and a double torsion spring 307 are installed inside the pull - firing base 308. A pin three 310 penetrates through the pull - firing base 308, the pull - firing movable block three 306, and the double torsion spring 307. A pin two 309 penetrates through the left side of the pull - firing base 308. The pin two 309 is used to simulate making a sound after being impacted to improve the simulation degree.

[0036] A single torsion spring 303 is arranged inside the pull - firing movable block one 302. A pin one 304 penetrates through the middle of the single torsion spring 303. The pin one 304 also penetrates through a pull - firing movable block two 305. The pull - firing movable block two 305 is installed below the pull - firing movable block three 306. The pin one 304 penetrates through the pull - firing movable block one 302, the pull - firing movable block two 305, and the single torsion spring 303 in sequence, ensuring that the pull - firing movable block one 302 and the pull - firing movable block two 305 can rebound at variable angles.

[0037] Refer to Figure 5 - Figure 6 , the sight tilting bracket 4 includes a sight base 401, a lower clamping hoop 404, a torsion spring 405, and a sight bracket 406. A concentric hole is opened on one side of the lower clamping hoop 404 close to the sight base 401. An arc notch is opened on the front - segment shaft of the sight bracket 406. The sight bracket 406 passes through the torsion spring 405 and is fixed on the concentric hole. Both ends of the torsion spring 405 are respectively fixed on the lower clamping hoop 404 and the sight bracket 406 and maintain a torsional force. The sight base 401 is installed between the concentric holes. The sight bracket 406 penetrates through the torsion spring 405, the lower clamping hoop 404, and the sight base 401 and the four are interconnected.

[0038] A knurled hand - tightening screw one 402 and a cross - recessed pan - head screw 403 are installed on the sight base 401. The cross - recessed pan - head screw 403 fits with the arc notch of the sight bracket 406, which is used to limit the rotation of the sight bracket 406. A knurled hand - tightening screw two 407 is installed at the bottom of the sight bracket 406.

[0039] Refer toFigure 7 - Figure 8 , the high-low rack 5 includes a set of foot components 501, a set of buckles 503, and a central shaft seat component 504. A set of buckles 503 is snap-connected to the outer surface of the central shaft seat component 504. The tops of a set of foot components 501 are respectively supported and connected to the opposite side surfaces of the central shaft seat component 504 through the buckles 503 at their upper ends. A hook handle component 520 is installed in the middle of each foot component 501. The hook handle component 520 is slidably connected to the foot component 501 and is used to lock at any position of the foot component 501.

[0040] A holeless central shaft seat 506, a main gear 502, a perforated central shaft seat 519, a bearing 518, a gland 517, and a high-low crank component 516 are sequentially connected to the central shaft seat component 504. The holeless central shaft seat 506 is thread-connected to the central shaft seat component 504 and is used to fix the buckle 503. The main gear 502 is installed inside the central shaft seat component 504. The main gear 502 passes through the perforated central shaft seat 519 and is locked with a nut, which is convenient to ensure the normal rotation of the bearing 518 inside the perforated central shaft seat 519. The bearing 518 is pressed by the gland 517 into the perforated central shaft seat 519. The high-low crank component 516 is installed outside the gland 517. The high-low crank component 516 is connected to the main gear 502 through an expansion pin.

[0041] A vertical transmission lead screw 507 is connected below the central shaft seat component 504. The vertical transmission lead screw 507 sequentially passes through and is connected to a secondary gear 508, a vertical transmission nut 509, a copper sleeve 510, a clamping ring 511, a plain bearing 512, a tail pipe cap 513, and a nylon guide sleeve 514. The secondary gear 508 and the vertical transmission nut 509 are screwed together with screws and are screwed onto the vertical transmission lead screw 507. The copper sleeve 510 is installed at the bottom of the vertical transmission nut 509 with a clearance fit. The plain bearing 512 is installed at the bottom of the copper sleeve 510. The tail pipe cap 513 is installed outside the plain bearing 512 and is used to hold the upper copper sleeve 510 and the vertical transmission nut 509. The tail pipe cap 513 is thread-connected to the central shaft seat component 504 and is used to adjust the mating distance between the main gear 502 and the secondary gear 508. After adjustment, it is locked with the clamping ring 511. The clamping ring 511 is thread-connected to the central shaft seat component 504. The nylon guide sleeve 514 is installed with an "O-ring seal" and is connected to the vertical transmission lead screw 507 through an expansion pin. A left-right sliding connector 505 is installed at the top of the vertical transmission lead screw 507. The left-right sliding connector 505 is connected to the vertical transmission lead screw 507 through an expansion pin.

[0042] A tail pipe component 515 is provided at the bottom of the tail pipe cap 513. The tail pipe component 515 is thread-connected to the tail pipe cap 513 and serves the functions of guiding, stabilizing the vertical transmission lead screw 507, sealing the vertical transmission lead screw 507, and height limiting.

[0043] The tail pipe assembly 515 and the hook handle assembly 520 are connected by pins, so that the support leg assembly 501 can be opened and closed left and right and can be limited in position.

[0044] In this embodiment:

[0045] When the mortar simulator starts simulating, first adjust the elevation frame 5, and by shaking the elevation crank assembly 516, the rotation of the elevation crank assembly 516 drives the main gear 502 to rotate, and the rotation of the main gear 502 drives the sub-gear 508 to rotate. At this time, the support leg assembly 501 can be opened and closed left and right and can be limited, and the upper and lower transmission screws 507 can stably transmit up and down. The elevation crank assembly 516 rotates clockwise, and the upper and lower transmission screws 507 rise, that is, the gun barrel 6 rises, and the elevation crank assembly 516 rotates counterclockwise, and the upper and lower transmission screws 507 descend, that is, the gun barrel 6 falls, and a tail pipe assembly 515 is installed at the bottom of the upper and lower transmission screws 507, which plays a role in guiding, stabilizing the upper and lower transmission screws 507, sealing the upper and lower transmission screws 507 and limiting the height. The elevation frame 5 restores the operating steps of adjusting the gun barrel during actual equipment training, thereby improving the simulation degree of the simulator.

[0046] After adjusting the height frame 5, adjust the sight tilt bracket 4 and turn the knurled thumb screw 402 in the forward direction. The knurled thumb screw 402 rotates against the lower clamp 404, driving the sight seat 401 to rotate, thereby driving the sight bracket 406 to rotate; when the knurled thumb screw 402 rotates in the reverse direction, the torque of the torsion spring 405 drives the sight bracket 406 to recover, thereby realizing the function of manually adjusting the roll angle with the knob. The sight tilt bracket 4 restores the operating steps of adjusting the sight tilt bracket during actual equipment training, thereby improving the simulation degree of the simulator.

[0047] After adjusting the sight tilt bracket 4, the shell firing simulation is carried out through the trigger device 3. After the trainer puts the simulated shell 1 into the gun barrel 6, the simulated shell 1 slides to the bottom of the gun barrel 6. The trainer pulls the trigger wrench 301 downward to a certain angle, and the wrench pin 311 rotates, driving the trigger movable block 1 302, the column pin 1 304, and the trigger movable block 2 305 to work together. Because the single torsion spring 303 effectively keeps the trigger movable block 2 305 dragging the step of the trigger movable block 3 306, when the angle reaches a certain value, the trigger movable block 306 is pulled back. The step of block three 306 cannot stop the triggering movable block two 305. The triggering movable block three 306 rebounds due to the force of the double torsion spring 307 and hits the pin two 309 to achieve the exciting sound. After the triggering wrench 301 is subjected to the force, it returns to the initial position due to the force of the single torsion spring 303. Repeating the action achieves the continuous firing effect. The triggering device 3 restores the operating steps of firing shells during actual equipment training and simulates the sound of shell firing, thereby improving the simulation degree of the simulator. The triggering wrench 301 can be operated continuously, which also improves the training efficiency.

[0048] After simulating the process of shell firing with the hair pulling device 3, when the next training requires simulating reloading, the simulated shell 1 can be taken out from the gun barrel window 2, and the next training can be carried out quickly, improving the training efficiency.

[0049] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper part", "middle part", "bottom part", "left and right", "inside", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0050] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mortar simulator, comprising a gun barrel (6), characterized in that: A trigger device (3) is installed at the bottom of the gun barrel (6), a sight tilt bracket (4) is installed in the middle of the gun barrel (6), and a height bracket (5) is installed directly below the sight tilt bracket (4); The triggering device (3) comprises a triggering wrench (301) and a triggering base (308) arranged at the bottom of the gun barrel (6); a triggering movable block 1 (302) is arranged inside the triggering base (308); a pin hole is arranged at the lower end of the triggering wrench (301); a wrench pin (311) is connected through the triggering wrench (301), the triggering base (308) and the triggering movable block 1 (302); a triggering movable block 3 (306) and a double torsion spring (307) are installed inside the triggering base (308); a column pin 3 (310) is connected through the triggering base (308), the triggering movable block 3 (306) and the double torsion spring (307); and a column pin 2 (309) is connected through the left side of the triggering base (308).

2. A mortar simulator according to claim 1, characterized in that: A single torsion spring (303) is arranged inside the hair-pulling movable block 1 (302), a column pin 1 (304) passes through the middle of the single torsion spring (303), a hair-pulling movable block 2 (305) passes through the surface of the column pin 1 (304), the hair-pulling movable block 2 (305) is installed below the hair-pulling movable block 3 (306), and the column pin 1 (304) passes through the hair-pulling movable block 1 (302), the hair-pulling movable block 2 (305), and the single torsion spring (303) in sequence.

3. A mortar simulator according to claim 1, characterized in that: A barrel window (2) is provided at the lower end of the outer surface of the barrel (6), and a simulated cannonball (1) is placed at the barrel window (2).

4. A mortar simulator according to claim 1, characterized in that: The sight tilt bracket (4) comprises a sight seat (401), a lower hoop (404), a torsion spring (405), and a sight bracket (406); a concentric hole is formed on a side of the lower hoop (404) close to the sight seat (401); a circular arc notch is formed on a front shaft of the sight bracket (406); the sight bracket (406) passes through the torsion spring (405) and is fixed to the concentric hole; two ends of the torsion spring (405) are respectively fixed to the lower hoop (404) and the sight bracket (406); and The torque is maintained, the sight seat (401) is installed between the concentric holes, the sight bracket (406) simultaneously passes through the torsion spring (405), the lower clamp (404), and the sight seat (401), and the four are connected to each other, and a knurled thumb screw (402) and a cross pan head screw (403) are installed on the sight seat (401), and the cross pan head screw (403) is matched with the arc notch of the sight bracket (406), and a knurled thumb screw (407) is installed at the bottom of the sight bracket (406).

5. A mortar simulator according to claim 1, characterized in that: The high-low frame (5) comprises a middle axis tube seat assembly (504), to which a middle axis tube seat without holes (506), a main gear (502), a middle axis tube seat with holes (519), a bearing (518), a pressure cover (517), and a high-low crank assembly (516) are sequentially connected; the middle axis tube seat without holes (506) is threadedly connected to the middle axis tube seat assembly (504); the main gear (502) is installed inside the middle axis tube seat assembly (504); the main gear (502) passes through the middle axis tube seat with holes (519) and is locked with a nut; the bearing (518) is pressed into the middle axis tube seat with holes (519) by the pressure cover (517); the high-low crank assembly (516) is installed on the outside of the pressure cover (517); and the high-low crank assembly (516) is connected to the main gear (502) via an expansion pin.

6. A mortar simulator according to claim 5, characterized in that: An upper and lower transmission screw (507) is connected below the middle shaft pipe seat assembly (504); the upper and lower transmission screws (507) are sequentially penetrated by a secondary gear (508), an upper and lower transmission nut (509), a copper sleeve (510), a tightening ring (511), a plane bearing (512), a tail pipe cap (513), and a nylon guide sleeve (514); the secondary gear (508) and the upper and lower transmission nuts (509) are screwed together on the upper and lower transmission screws (507); the copper sleeve (510) is installed at the bottom of the upper and lower transmission nuts (509) to fit the gap between the two; the plane bearing (512) is installed at the bottom of the upper and lower transmission nuts (509) to fit the gap between the two; The tail pipe cap (513) is installed at the bottom of the copper sleeve (510), and the tail pipe cap (513) is installed outside the plane bearing (512). The tail pipe cap (513) is connected to the middle axis tube seat assembly (504) by means of threads. The tightening ring (511) is connected to the middle axis tube seat assembly (504) by means of threads. The nylon guide sleeve (514) is equipped with an "O-ring" and connected to the upper and lower transmission screws (507) by means of expansion pins. A left and right sliding connector (505) is installed on the top of the upper and lower transmission screws (507), and the left and right sliding connector (505) is connected to the upper and lower transmission screws (507) by means of expansion pins.

7. A mortar simulator according to claim 6, characterized in that: A tail pipe assembly (515) is provided at the bottom of the tail pipe cap (513), and the tail pipe assembly (515) is threadedly connected to the tail pipe cap (513).

8. A mortar simulator according to claim 7, characterized in that: The high and low frame (5) is provided with a group of support leg assemblies (501) and a group of buckles (503); a group of buckles (503) are snap-fitted and connected to the outer surface of the middle axis tube seat assembly (504); the top of a group of support leg assemblies (501) are supported and connected to the opposite two side surfaces of the middle axis tube seat assembly (504) through the buckles (503) at their upper ends; a hook handle assembly (520) is installed in the middle of each support leg assembly (501); the hook handle assembly (520) is connected to the support leg assembly (501) by sliding fit; and the tail pipe assembly (515) is connected to the hook handle assembly (520) by pins.

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