Multifunctional exoskeleton mechanical arm type refueling ladder

Abstract

This invention discloses a multifunctional exoskeleton-type robotic arm refueling ladder, relating to the field of airport ground service technology. It includes: a mobile trolley capable of walking and positioning, with a support platform on top of the trolley; a lifting structure fixedly connected to the front end of the trolley; and a refueling connector mounting structure for positioning the refueling connector. The refueling connector mounting structure is fixedly installed on the top of the outer wall of the support platform. The refueling connector mounting structure includes a mounting base, with a receiving slot on the side wall of the mounting base communicating with its top and bottom ends for accommodating the refueling pipe. The top of the receiving slot has a connector slot for accommodating the refueling connector. This invention facilitates the movement of the entire refueling ladder via the mobile trolley, making it easy to move and transport. The lifting mechanism on the mobile trolley allows for height adjustment of the support platform, while the refueling connector mounting structure on the support platform secures the refueling connector, making aircraft refueling operations more efficient and convenient.

Description

Technical Field

[0001] This invention relates to the field of aircraft refueling technology, and in particular to a multifunctional exoskeleton robotic arm refueling ladder. Background Technology

[0002] Refueling ladders are commonly used in airport ground operations. Ground staff climb the ladder to reach a height suitable for refueling, allowing them to easily insert the refueling hose connector into the aircraft's refueling port to complete the refueling process.

[0003] In the existing technology, the refueling ladders used in ground operations are generally foldable step-type refueling ladders, which need to be manually carried by the refueling operator to the bottom of the aircraft's fuel tank before being unfolded and used. Moreover, the refueling operator needs to climb the refueling ladder and manually send the refueling hose connector to the aircraft's refueling port.

[0004] In actual use, it was found that the folding step-type refueling ladder is troublesome to move, time-consuming and labor-intensive. At the same time, there are safety hazards for refueling staff to climb back and forth (for example, slipping or falling off in rainy or snowy weather). Moreover, the refueling ladder does not have a refueling connector attachment structure, and the refueling staff need to drag the refueling connector while climbing, which is inconvenient to use and can easily cause the refueling connector to fall off and be damaged. Therefore, a multi-functional exoskeleton robotic arm refueling ladder is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a multifunctional exoskeleton robotic arm refueling ladder to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multifunctional exoskeleton robotic arm refueling ladder, comprising:

[0007] A mobile cart that can move and be positioned, with a support platform on top for refueling personnel to stand on;

[0008] The lifting structure, fixedly connected to the front end of the mobile trolley, is used to support the vertical adjustment of the platform's height.

[0009] A refueling connector mounting structure for positioning the refueling connector is fixedly installed on the top of the outer wall of the support platform. The refueling connector mounting structure includes a mounting base. The side wall of the mounting base has a receiving groove that communicates with its top and bottom ends for receiving the refueling pipe. The top of the receiving groove has a connector slot for receiving the refueling connector.

[0010] Preferably, the top of the receiving slotted sidewall is provided with a telescopic slot, and a horizontally telescopic auxiliary clamp is movably provided in the telescopic slot. The auxiliary clamp is V-shaped on the side facing the outside of the telescopic slot and is fixedly connected with a V-shaped rubber pad.

[0011] Preferably, the auxiliary clamping plate has a trapezoidal slot on one side facing the inside of the telescopic slot, and roller assemblies that can roll along the trapezoidal slot are movably provided at the two bends of the trapezoidal slot. The telescopic slot is provided with a self-rotating bidirectional lead screw, and the outer wall of the bidirectional lead screw is threadedly connected to the ends of the two roller assemblies respectively.

[0012] Preferably, the side wall of the auxiliary clamp is provided with a side ear groove, a stop block is movably provided in the side ear groove, and one side of the stop block extends out of the side ear groove and is fixedly connected to the inner wall of the telescopic slot. A return spring is fixedly connected between the stop block and the opposite side of the side ear groove.

[0013] Preferably, the receiving slot has a storage groove inside the side that communicates with the end of the connector slot, and the storage groove is connected to the inside of the telescopic slot. The storage groove has a rotatable shielding rod inside.

[0014] Preferably, a telescopic rod is movably inserted into the bottom end of the shielding rod, one end of the telescopic rod extends into the interior of the shielding rod and is fixedly connected to a second return spring, and an auxiliary roller is rotatably connected to the end of the telescopic rod away from the shielding rod.

[0015] Preferably, a support frame is movably provided inside the connector slot, and a support spring is fixedly connected between the support frame and the bottom of the connector slot. A first rack plate is movably provided inside the telescopic slot. A gear sleeve that meshes with the first rack plate is fixedly sleeved on the outer wall of the bidirectional lead screw. The top of the first rack plate is bent and extends into the connector slot and is fixedly connected to the side wall of the support frame. A straight through slot for vertical lifting of the first rack plate is provided on the side wall of the rotating shaft.

[0016] Preferably, an incomplete gear that rotates coaxially with the shielding rod is fixedly provided at the top of the shielding rod, a second rack plate is meshed with one side of the incomplete gear, a connecting rod is fixedly connected to the bottom of the side wall of the second rack plate, and one end of the connecting rod is fixedly connected to the side wall of the first rack plate.

[0017] Preferably, the lifting structure includes a lifting column, a lifting seat is inserted into one side of the lifting column, one end of the lifting seat extends to the outside of the lifting column and is fixedly installed with the bearing platform, a rotating shaft is rotatably connected to the other side of the lifting column, a winding wheel is fixedly sleeved on the outer wall of the rotating shaft, an installation slot is opened at the top of the middle part of the lifting column, a fixed pulley is rotatably connected in the installation slot, a traction rope is fixedly connected to the top of the lifting seat, and one end of the traction rope passes around the outer wall of the fixed pulley and is wound up to the outer wall of the winding wheel;

[0018] A worm gear is fixedly connected to the middle of the rotating shaft, and a worm is meshed with the bottom of the worm gear. A drive motor is fixedly connected to the top of the moving trolley, and the drive shaft of the drive motor is connected to one end of the worm.

[0019] Preferably, a step is fixedly connected to one side of the top of the mobile trolley for auxiliary support for the refueling operator to climb the carrying platform. A fixed seat is fixedly connected to the top of the carrying platform and to the side of the refueling connector hook structure. A laser aiming device is fixedly connected to the outer wall of the fixed seat.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] (1) The present invention can facilitate the movement of the entire refueling ladder by means of a mobile trolley, making it convenient to move and transport. With the lifting mechanism on the mobile trolley, the height of the carrying platform can be adjusted, which can make it convenient for the refueling operator to stand while adapting to various refueling heights. At the same time, the refueling connector is fixed by the refueling connector hook structure on the carrying platform, which eliminates the difficulty for the refueling operator to drag and hold the refueling connector, enhances the safety protection of the refueling connector, and achieves the adjustment of the refueling height of the refueling connector, making the aircraft refueling work more efficient and convenient.

[0022] (2) In the refueling connector hanging structure of the present invention, the gravity of the refueling connector and the tensile force generated during the rising process can be used to drive the bearing frame to descend and drive the first rack plate and the second rack plate to move down. With the help of the gear sleeve and the incomplete gear, the auxiliary clamp plate can be driven to extend horizontally and the blocking rod can be rotated and extended simultaneously, so that the refueling connector is positioned and stable in the receiving slot and cannot be detached, thereby achieving the purpose of improving the hanging firmness of the refueling connector.

[0023] (3) In the refueling connector hook structure of the present invention, the trapezoidal slot on the back of the auxiliary clamp plate is used in conjunction with the roller assembly and the bidirectional screw drive. The side ear groove on the side wall of the auxiliary clamp plate, the return spring and the stop block are used to automatically move back and reset the auxiliary clamp plate. The two roller assemblies can be driven to move synchronously in opposite directions or synchronously in opposite directions by rotating the bidirectional screw clockwise or counterclockwise to drive the auxiliary clamp plate to extend or retract. Thus, the refueling connector with the refueling pipe can be automatically clamped and positioned after being put into the receiving slot of the hook seat. At the same time, it can be automatically unlocked while being lifted upward, making the operation more flexible and convenient. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 This is a three-dimensional structural diagram of the refueling connector attachment structure of the present invention.

[0026] Figure 3 This is a partial cross-sectional view of the mounting base of the present invention from a top view.

[0027] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the structure at point A.

[0028] Figure 5 This is a partial cross-sectional view of the front of the mounting base of the present invention.

[0029] Figure 6 This is a top sectional view of the lifting column of the present invention.

[0030] In the diagram: 100, Mobile trolley; 101, Drive motor; 102, Step tread; 200, Support platform; 201, Fixed base; 202, Laser aiming device; 300, Lifting structure; 301, Lifting column; 302, Lifting seat; 303, Rotating shaft; 304, Rewinding wheel; 305, Worm gear; 306, Worm; 307, Mounting slot; 308, Fixed pulley; 400, Oil filling connector mounting structure; 401, Mounting seat; 402, Receiving slot; 403, Connector slot; 404. 405. Supporting frame; 406. Telescopic slot; 407. Auxiliary clamping plate; 408. Trapezoidal slot; 409. Roller assembly; 410. Two-way lead screw; 411. Gear sleeve; 412. First rack plate; 413. Side ear slot; 414. Return spring one; 415. Stop block; 416. Storage slot; 417. Blocking rod; 418. Incomplete gear; 419. Second rack plate; 420. Connecting rod; 421. Telescopic rod; 422. Return spring two; 423. Auxiliary roller. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] This invention provides, for example Figure 1-6 The multifunctional exoskeleton robotic arm refueling ladder shown includes:

[0033] A mobile cart 100 that can move and be positioned is equipped with drive wheels and steering wheels. The drive wheels can be driven by a motor controlled by a switch button. A support platform 200 for gas station attendants to stand on is provided on the top of the mobile cart 100. A step 102 is fixedly connected to one side of the top of the mobile cart 100 to provide auxiliary support for gas station attendants to climb the support platform 200. Gas station attendants can climb the support platform 200 through the step 102, making it more effortless and convenient. At the same time, the support platform 200 makes it easier for gas station attendants to stand, changing the traditional way of climbing gas station ladders.

[0034] A lifting structure 300, fixedly connected to the front end of the mobile trolley 100, is used to adjust the height of the carrying platform 200 in the vertical direction. In a preferred embodiment, the lifting structure 300 includes a lifting column 301. A lifting seat 302 is inserted into one side of the lifting column 301. One end of the lifting seat 302 extends to the outside of the lifting column 301 and is fixedly installed with the carrying platform 200. A rotating shaft 303 is rotatably connected to the other side of the lifting column 301. A winding wheel 304 is fixedly sleeved on the outer wall of the rotating shaft 303. A mounting slot 307 is opened at the top of the middle part of the lifting column 301. A fixed pulley 308 is rotatably connected in the mounting slot 307. A traction rope is fixedly connected to the top of the lifting seat 302. One end of the traction rope passes around the outer wall of the fixed pulley 308 and is wound up on the outer wall of the winding wheel 304. The rotating shaft 303 drives the winding wheel 304 to rotate clockwise or counterclockwise. The lifting platform 302 can be raised or lowered by the fixed pulley 308 to achieve the rewinding or unwinding of the traction rope, thereby adjusting the height of the carrying platform 200 to meet the needs of multiple heights. A worm gear 305 is fixedly connected to the middle of the rotating shaft 303, and a worm 306 is meshed with the bottom of the worm gear 305. A drive motor 101 is fixedly connected to the top of the moving trolley 100. The drive shaft of the drive motor 101 is connected to one end of the worm 306. The drive motor 101 drives the worm 306 to drive the worm gear 305 on the rotating shaft 303 to rotate, thereby driving the rotation of the rotating shaft 303. At the same time, it meets the installation requirements of the drive motor 101 on the moving trolley 100. Moreover, the self-locking effect of the worm 306 on the worm gear 305 can be used to achieve the self-locking of the position of the winding wheel 304 after winding.

[0035] A refueling connector mounting structure 400 is used for positioning the refueling connector. The refueling connector mounting structure 400 is fixedly installed on the top of the outer wall of the support platform 200. A fixing seat 201 is fixedly connected to the top of the support platform 200, located on one side of the refueling connector mounting structure 400. A laser aiming device 202 is fixedly connected to the outer wall of the fixing seat 201. The laser aiming device 202 guides and positions the refueling connector mounted on the refueling connector mounting structure 400 in the vertical direction, indicating the contact position between the refueling connector and the underside of the aircraft wing after the support platform 200 moves upward. This helps adjust the alignment accuracy between the refueling connector and the refueling port under the aircraft wing, allowing the refueling connector to be positioned accurately. The refueling connector is inserted precisely into the refueling port on the aircraft wing for automatic refueling. The refueling connector mounting structure 400 includes a mounting base 401. The mounting base 401 has a receiving slot 402 on its side wall, communicating with its top and bottom ends, for accommodating the refueling hose. The top of the receiving slot 402 has a connector slot 403 for accommodating the refueling connector. Since the refueling connector has a cross-shaped cross-section, and the width of the receiving slot 402 is smaller than the connector slot 403, the refueling connector is snapped into the connector slot 403, while the refueling hose is snapped into the receiving slot 402. This facilitates direct insertion of the refueling connector and refueling hose into the receiving slot 402 of the mounting base 401. The receiving slot 402... A telescopic slot 406 is provided at the top of the wall, and a horizontally telescopic auxiliary clamping plate 407 is movably installed within the telescopic slot 406. The auxiliary clamping plate 407 is V-shaped on the side facing the outside of the worm gear 306 and is fixedly connected with a V-shaped rubber pad. The auxiliary clamping plate 407 extends out of the telescopic slot 406 to clamp the connection between the refueling pipe and the refueling connector. Since the refueling pipe is circular, the auxiliary clamping plate 407 with the V-shaped slot, together with the V-shaped rubber pad, can achieve four-point clamping of the outer wall of the refueling pipe, enhancing the stability of the clamping. Furthermore, a trapezoidal slot 408 is provided on the side of the auxiliary clamping plate 407 facing the inside of the worm gear 306. At the two bends of the trapezoidal slot 408, there are movable parts that can move along the trapezoidal slot. The 408 rolling roller assembly 409 has a telescopic slot 406 with a self-rotating bidirectional screw 410 inside. The outer wall of the bidirectional screw 410 is threaded into the ends of the two roller assemblies 409 respectively. By utilizing the shape matching of the trapezoidal slot 408 and the roller assembly 409, the two roller assemblies 409 can be moved in the trapezoidal slot 408 by rotating the bidirectional screw 410 clockwise. This pushes the auxiliary clamp 407 to extend outward, thereby achieving the purpose of limiting and fixing the refueling pipe within the receiving slot 402. The rollers in the roller assembly 409 can be I-shaped, and the inner middle of the trapezoidal slot 408 has a corresponding guide rail to maintain the stable movement of the roller assembly 409 within the trapezoidal slot 408.Furthermore, the auxiliary clamping plate 407 has a side ear groove 413 on its side wall. A stop block 415 is movably installed in the side ear groove 413, and one side of the stop block 415 extends out of the side ear groove 413 and is fixedly connected to the inner wall of the telescopic slot 406. A return spring 414 is fixedly connected between the stop block 415 and the opposite side of the side ear groove 413. When the auxiliary clamping plate 407 extends, it drives the stop block 415 to press the return spring 414, which in turn drives the two roller assemblies 409 to move synchronously in opposite directions under the drive of the bidirectional screw 410. In this way, the auxiliary clamping plate 407 automatically retracts into the telescopic slot 406 under the reverse thrust of the return spring 414.

[0036] Furthermore, a receiving groove 416 is provided inside one side of the receiving groove 402, which communicates with the end of the connector slot 403. The receiving groove 416 is also connected to the inside of the telescopic groove 406. A rotatable blocking rod 417 is provided inside the receiving groove 416. By rotating the blocking rod 417 within the receiving groove 416, it can rotate from a vertically downward position to a horizontal position, thereby blocking the receiving groove 402 and preventing the refueling connector from being directly moved horizontally to be removed. Furthermore, a telescopic rod 421 is movably inserted into the bottom end of the blocking rod 417, with one end of the telescopic rod 421 extending to the blocking rod. A return spring 422 is fixedly connected inside the rod 417. An auxiliary roller 423 is rotatably connected to the end of the telescopic rod 421 away from the blocking rod 417. The telescopic rod 421, in conjunction with the return spring 422, can press against the inner wall of the receiving slot 402 when the blocking rod 417 rotates and extends. This allows the telescopic rod 421 to retract into the blocking rod 417, thus fully blocking the port of the receiving slot 402. The auxiliary roller 423 reduces the frictional resistance between the blocking rod 417 and the inner wall of the receiving slot 402, preventing jamming.

[0037] Furthermore, a support frame 404 is movably mounted inside the connector slot 403, and a support spring 405 is fixedly connected between the support frame 404 and the bottom of the connector slot 403. A first rack plate 412 is movably mounted inside the telescopic slot 406, and a gear sleeve 411 that meshes with the first rack plate 412 is fixedly sleeved on the outer wall of the bidirectional lead screw 410. The top of the first rack plate 412 is bent and extends into the connector slot 403 and is fixedly connected to the side wall of the support frame 404. When the refueling connector is placed on the support frame 404, the weight of the refueling connector and the downward movement process can generate... The downward pressure causes the bearing frame 404 to move downward, compressing and deforming the support spring 405. This causes the first rack plate 412 to move downward, thereby driving the gear sleeve 411 to rotate, which in turn drives the double-acting screw 410 to rotate, causing the two roller assemblies 409 to move synchronously in opposite directions, thus driving the extension of the auxiliary clamping plate 407. When the oil filler connector is removed upward, the bearing frame 404 returns to its original position using the elastic thrust of the support spring 405, thus automatically retracting the auxiliary clamping plate 407. The side wall of the rotating shaft 303 has an opening for the first rack plate 412. 12. A vertically lifting straight channel; a partially rotating gear 418 coaxially with the top of the blocking rod 417 is fixedly installed; a second rack plate 419 is meshed with one side of the partially rotating gear 418; a connecting rod 420 is fixedly connected to the bottom of the side wall of the second rack plate 419; one end of the connecting rod 420 is fixedly connected to the side wall of the first rack plate 412; the connection between the first rack plate 412 and the second rack plate 419 via the connecting rod 420 allows the bearing frame 404 to synchronously drive the first rack plate 412 and the second rack plate 419 to move, and utilizes the second… The meshing between the rack plate 419 and the incomplete gear 418 can drive the blocking rod 417 to rotate from vertical downward to horizontal position. Then, the second rack plate 419 separates from the incomplete gear 418. The elastic thrust of the telescopic rod 421 and the second return spring 422 keeps the blocking rod 417 stably placed in the horizontal position. When the oiling connector is unlocked upward, the carrier frame 404 automatically rises using the support spring 405, which drives the second rack plate 419 to move in the opposite direction, thereby driving the incomplete gear 418 to rotate in the opposite direction, achieving the rotation and storage of the blocking rod 417.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended 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 make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multifunctional exoskeleton robotic arm refueling ladder, characterized in that, include: A mobile cart (100) that can move and be positioned, with a support platform (200) above the mobile cart (100) for the gas station attendant to stand on. A lifting structure (300) fixedly connected to the front end of the mobile trolley (100) is used to adjust the height of the carrying platform (200) in the vertical direction; A refueling connector mounting structure (400) for positioning the refueling connector is fixedly installed on the top of the outer wall of the bearing platform (200). The refueling connector mounting structure (400) includes a mounting base (401). The mounting base (401) has a receiving slot (402) on its side wall that communicates with its top and bottom ends for receiving the refueling pipe. The top of the receiving slot (402) has a connector slot (403) for receiving the refueling connector. The top of the side wall of the receiving slot (402) is provided with a telescopic slot (406), and a horizontally telescopic auxiliary clamp (407) is movably provided in the telescopic slot (406). The auxiliary clamp (407) is V-shaped on the side facing the outside of the telescopic slot (406) and is fixedly connected with a V-shaped rubber pad. The auxiliary clamp (407) extends out of the telescopic slot (406) to clamp the connection between the refueling pipe and the refueling connector. The auxiliary clamp (407) has a trapezoidal slot (408) on one side facing the inside of the telescopic slot (406). Roller assemblies (409) that can roll along the trapezoidal slot (408) are movably provided at the two bends of the trapezoidal slot (408). A self-rotating bidirectional screw (410) is provided inside the telescopic slot (406). The outer wall of the bidirectional screw (410) is threaded into the ends of the two roller assemblies (409) respectively. The auxiliary clamp (407) has a side ear groove (413) on its side wall. A stop block (415) is movably provided in the side ear groove (413). One side of the stop block (415) extends out of the side ear groove (413) and is fixedly connected to the inner wall of the telescopic slot (406). A return spring (414) is fixedly connected between the stop block (415) and the opposite side of the side ear groove (413). The receiving slot (402) has a storage slot (416) inside one side that communicates with the end of the connector slot (403), and the storage slot (416) is connected to the inside of the telescopic slot (406). The storage slot (416) has a rotatable shielding rod (417) inside. The bottom end of the shielding rod (417) is movably connected to a telescopic rod (421). One end of the telescopic rod (421) extends into the interior of the shielding rod (417) and is fixedly connected to a second return spring (422). The end of the telescopic rod (421) away from the shielding rod (417) is rotatably connected to an auxiliary roller (423). The connector slot (403) is movably provided with a support frame (404). A support spring (405) is fixedly connected between the support frame (404) and the bottom of the connector slot (403). The telescopic slot (406) is movably provided with a first rack plate (412). The outer wall of the bidirectional screw (410) is fixedly sleeved with a gear sleeve (411) that meshes with the first rack plate (412). The top of the first rack plate (412) is bent and extends into the connector slot (403) and is fixedly connected to the side wall of the support frame (404). When the oiling connector is placed on the support frame (404), the weight of the oiling connector and the downward pressure generated during the downward movement cause the support frame (404) to move downward. The support spring (405) is compressed and deformed, which can drive the first rack plate (412) to move downward. The top of the shielding rod (417) is fixedly provided with an incomplete gear (418) that rotates coaxially with the shielding rod (417). A second rack plate (419) is meshed with one side of the incomplete gear (418). A connecting rod (420) is fixedly connected to the bottom of the side wall of the second rack plate (419). One end of the connecting rod (420) is fixedly connected to the side wall of the first rack plate (412).

2. The multifunctional exoskeleton robotic arm refueling ladder according to claim 1, characterized in that, The lifting structure (300) includes a lifting column (301), a lifting seat (302) is inserted into one side of the lifting column (301), one end of the lifting seat (302) extends to the outside of the lifting column (301) and is fixedly set with the bearing platform (200), a rotating shaft (303) is rotatably connected to the other side of the lifting column (301), a winding wheel (304) is fixedly sleeved on the outer wall of the rotating shaft (303), an installation slot (307) is opened at the top of the middle part of the lifting column (301), a fixed pulley (308) is rotatably connected in the installation slot (307), a traction rope is fixedly connected to the top of the lifting seat (302), one end of the traction rope passes around the outer wall of the fixed pulley (308) and is wound up to the outer wall of the winding wheel (304); A worm gear (305) is fixedly connected to the middle of the rotating shaft (303), and a worm (306) is meshed with the bottom of the worm gear (305). A drive motor (101) is fixedly connected to the top of the moving trolley (100), and the drive shaft of the drive motor (101) is connected to one end of the worm (306) for transmission.

3. The multifunctional exoskeleton robotic arm refueling ladder according to claim 1, characterized in that, A step tread (102) is fixedly connected to one side of the top of the mobile trolley (100) for auxiliary support for the refueling operator to climb the carrying platform (200). A fixed seat (201) is fixedly connected to the top of the carrying platform (200) and to one side of the refueling connector hanging structure (400). A laser aiming device (202) is fixedly connected to the outer wall of the fixed seat (201).

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