Separating type bomb hanging device

Abstract

According to the technical scheme, the separating type bomb hanging device is characterized by comprising a movable base, and the movable base is used for moving on the ground; the projectile supporting and lifting frame is used for bearing a projectile body and can move in a manual carrying and lifting mode; the lifting frame is arranged above the movable base and can move up and down relative to the movable base, and the bullet supporting lifting frame is detachably connected to the top of the lifting frame; the lifting mechanism is arranged between the lifting frame and the movable base and used for driving the lifting frame to move up and down above the movable base; through the arrangement of the movable base and the bomb supporting lifting frame, bomb hanging adjustment only needs to be operated by manually pushing equipment, the complex and repeated posture adjusting process of a manual bomb hanging vehicle and a remote control bomb hanging vehicle is avoided, the bomb hanging time is shortened, and due to the arrangement of the lifting mechanism, the applicable bomb types are increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of hanging bomb loading, more specifically, it relates to a separated bomb hanging device. BACKGROUND

[0002] The bomb hanging device is ground support equipment for carrying various bombs, missiles, auxiliary fuel tanks, pods and the like to the underwing, underbelly or fuselage bomb bay for hanging operation, and the current bomb hanging operation mode mainly includes three modes, the first mode is a pure manual mode for small bombs, which relies on the bomb carrying device to carry the hanging object to the vicinity of the aircraft, and then the hanging object is manually lifted and carried to the fuselage; the second mode is a manual bomb hanging vehicle mode, which is a pure mechanical and hydraulic structure integrating the functions of carrying and hanging, and after the hanging object is carried to the lower part of the hanging rack, the mechanical and hydraulic structure is manually operated to adjust the vertical movement, horizontal movement, longitudinal movement, rotation, pitch and roll to adjust the position of the hanging object and align it with the hook, and finally the hanging operation is completed; the third mode is a remote control bomb hanging vehicle mode, which is different from the second mode, and the operator drives the hydraulic unit and the mechanical structure through the control handle.

[0003] For the first mode, because it is a pure manual mode, only small bombs are used, and for the second and third modes, whether the device is manually operated or operated through the handle, the object needs to be frequently adjusted in multiple directions, which results in a long hanging time and requires personnel with long-term professional training to operate. UTILITY MODEL CONTENT

[0004] In view of the deficiencies in the prior art, the utility model aims to provide a separated bomb hanging device, which can be operated by manually pushing the device to adjust the bomb hanging, avoids the complex and repeated adjustment process of the manual bomb hanging vehicle and the remote control bomb hanging vehicle, reduces the hanging time, and increases the applicable bomb types due to the setting of the lifting mechanism.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a separated bomb hanging device, comprising a movable base, the movable base is used for moving on the ground;

[0006] a bomb lifting frame, the bomb lifting frame is used for carrying the bomb body and can be moved by manual lifting;

[0007] a lifting frame, the lifting frame is arranged above the movable base and can move up and down relative to the movable base, and the bomb lifting frame is detachably connected to the top of the lifting frame;

[0008] And a lifting mechanism arranged between the lifting frame and the moving base for driving the lifting frame to move up and down above the moving base.

[0009] The utility model further sets up: the frame of supporting bullet includes the frame of supporting bullet body,

[0010] Support frame, the support frame is arranged with multiple and multiple support frames are arranged along the length direction of the frame of supporting bullet body, the support frame is fixedly connected on the frame of supporting bullet body, and the top of the support frame is provided with an arc slot with the axis direction parallel to the length direction of the frame of supporting bullet body;

[0011] And support roller, a plurality of support rollers are arranged on each support frame, and the plurality of support rollers on the support frame are arranged along the circumferential direction of the arc slot and are rotationally connected on the support frame.

[0012] The utility model further sets up: the frame of supporting bullet both sides are fixedly connected with a plurality of lifting rods.

[0013] The utility model further sets up: the frame of supporting bullet still includes a plurality of positioning pins that can vertically pass through the support frame and the lifting frame.

[0014] The utility model further sets up: the lifting mechanism includes fork arm assembly, the fork arm assembly is provided with two, and two fork arm assemblies are arranged at the position close to both sides of the moving base respectively.

[0015] The fork arm assembly includes a first fork arm, one end of the bottom of the first fork arm is hinged on the moving base, and one end of the top can slide in the horizontal direction on the lifting frame.

[0016] And a second fork arm, one end of the top of the second fork arm is hinged on the lifting frame, and one end of the bottom can slide in the horizontal direction on the moving base, the middle position of the first fork arm and the middle position of the second fork arm are hinged together, and the sliding direction of one end of the bottom of the second fork arm and the sliding direction of one end of the top of the first fork arm are parallel.

[0017] The utility model further sets up: the moving base includes bottom frame,

[0018] And universal wheel, the universal wheel is arranged with multiple and is arranged at the bottom of the bottom frame.

[0019] The utility model further sets up: the bottom frame includes first longitudinal beam, the first longitudinal beam is provided with two and the length direction of the first longitudinal beam is along the length direction of the bottom frame,

[0020] And first crossbeam, the first crossbeam is provided with two, and two first crossbeams are fixedly connected at the both ends of the first longitudinal beam, and the first crossbeam is arranged along the width direction of the bottom frame.

[0021] The lifting frame comprises two second longitudinal beams arranged side by side and arranged along the length direction of the lifting frame, and the length direction of the lifting frame is parallel to the length direction of the bottom frame;

[0022] Two second cross beams are arranged, and the two second cross beams are fixedly connected to the two ends of the second longitudinal beams and arranged along the width direction of the lifting frame.

[0023] The bottom end of the first fork arm is hingedly connected to one of the first cross beams, and the top end of the first fork arm is slidingly connected to one of the second longitudinal beams and slides along the length direction of the second longitudinal beam.

[0024] The top end of the second fork arm is hingedly connected to one of the second cross beams, and the bottom end of the second fork arm is slidingly connected to one of the first longitudinal beams and slides along the length direction of the first longitudinal beam.

[0025] The lifting mechanism further comprises an upper sliding rod, the upper sliding rod is fixedly connected to the top end of the two first fork arms, both ends of the upper sliding rod are fixedly provided with two bearings, and the two second longitudinal beams are provided with two second sliding grooves on the side close to each other.

[0026] The bottom end of the second fork arm is slidingly connected to one of the first longitudinal beams and slides along the length direction of the first longitudinal beam.

[0027] The lifting mechanism further comprises a mounting seat, the mounting seat is fixedly connected to the bottom of the two second longitudinal beams.

[0028] A lead screw is hingedly connected to the mounting seat and the second cross beam close to the upper sliding rod at both ends;

[0029] A lead screw nut is fixedly connected to the bottom of the upper sliding rod and threadedly matched with the lead screw.

[0030] A transmission shaft is rotatably connected to the bottom of the mounting seat, and one end of the transmission shaft is fixedly connected with a hand wheel.

[0031] A speed reducer is drivingly connected to the input end of the transmission shaft and drivingly connected to the lead screw at the output end.

[0032] Compared with the prior art, the lifting mechanism has the following beneficial effects:

[0033] 1. The utility model discloses a lifting mechanism is set up to the setting of mobile base and the pop-up frame of holding a bullet, make the bullet adjustment only need artificial pushing equipment to operate can, avoid the complex, repeated pose process of manual bullet hanging car and remote control bullet hanging car, reduce the bullet hanging time, and increase the applicable bullet kind because of the setting of lifting mechanism;

[0034] 2. The utility model discloses a pure mechanical mechanism and human force cooperation mode work, there is no traditional bullet hanging device in the accelerator etc. Operation, thereby not easy because of the operation mistake and cause the accident;

[0035] 3. The utility model discloses a pure mechanical mechanism, thereby avoid the hydraulic cylinder leakage or accidental leakage, motor power failure, battery package and so on unsafe event's occurrence, the reliability and safety of device are higher;

[0036] 4. The utility model discloses a pure mechanical mechanism, and the person is directly operated mechanical alignment bullet hanging, avoided the complex, repeated pose process of manual bullet hanging car and remote control bullet hanging car, thereby need not to the personnel long -term training, personnel easy to get on hand, reduced the training cost;

[0037] 5. The utility model discloses a pure mechanical mechanism, maintenance is simple, and the cost is low. ACCURACY

[0038] Figure 1 It is the schematic diagram of the whole structure of embodiment;

[0039] Figure 2 It is the A part enlarged schematic drawing of Figure 1 ;

[0040] Figure 3 It is the schematic diagram of the pop-up frame of holding a bullet of embodiment;

[0041] Figure 4 It is the schematic diagram of the embodiment and embodies the lifting mechanism;

[0042] Figure 5 It is the B part enlarged schematic drawing of Figure 4 ;

[0043] Figure 6 It is the C part enlarged schematic drawing of Figure 4 .

[0044] In the figure: 1, mobile base; 11, first longitudinal beam; 111, first sliding groove; 12, first cross beam; 13, universal wheel; 2, lifting frame; 21, second longitudinal beam; 211, second sliding groove; 22, second cross beam; 23, mounting seat; 24, positioning plate; 3, bullet supporting lifting frame; 31, bullet supporting frame body; 32, supporting frame; 321, arc-shaped groove; 33, supporting roller; 34, lifting rod; 35, positioning pin; 4, lifting mechanism; 41, first fork arm; 42, second fork arm; 43, lower sliding rod; 44, upper sliding rod; 45, lead screw; 46, lead screw nut; 47, speed reducer; 48, transmission shaft; 49, hand wheel; 5, limiting stop. DETAILED DESCRIPTION

[0045] In order to make the technical scheme of the utility model better understood by the people in the art, the technical scheme of the utility model will be described clearly and completely below in combination with the drawings of the utility model. Based on the embodiments in the present application, other similar embodiments obtained by the people in the art without making creative efforts should all belong to the scope of protection of the present application. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc. are only the directions of the drawings, therefore, the directional words used are used to explain but not to limit the creation of the utility model.

[0046] The utility model will be further described below in combination with the drawings and the preferred embodiments.

[0047] Embodiment: a split type bullet hanging device, referring to the drawings Figure 1 -attached Figure 6 , including mobile base 1, bullet supporting lifting frame 3, lifting frame 2 and lifting mechanism 4, the mobile base 1 is used to move on the ground;The bullet supporting lifting frame 3 is used to bear the bullet body and can be moved by manual lifting;The lifting frame 2 is arranged above the mobile base 1 and can move up and down relative to the mobile base 1, the bullet supporting lifting frame 3 is detachably connected at the top of the lifting frame 2;The lifting mechanism 4 is arranged between the lifting frame 2 and the mobile base 1 to drive the lifting frame 2 to move up and down above the mobile base 1.

[0048] The bullet supporting lifting frame 3 includes bullet supporting frame body 31, supporting frame 32 and supporting roller 33;The supporting frame 32 is provided with a plurality of and the plurality of supporting frames 32 are arranged along the length direction of the bullet supporting frame body 31, the supporting frame 32 is fixedly connected on the bullet supporting frame body 31, and the top of the supporting frame 32 is provided with an arc-shaped groove 321 with the axis direction parallel to the length direction of the bullet supporting frame body 31;A plurality of supporting rollers 33 are arranged on each supporting frame 32, and the plurality of supporting rollers 33 on the supporting frame 32 are arranged along the circumferential direction of the arc-shaped groove 321 and are rotatably connected on the supporting frame 32.

[0049] The elastic body is supported in the arc-shaped grooves 321 of the plurality of support frames 32 and is in contact with the support rollers 33 on the support frames 32. In this embodiment, the support rollers 33 are arranged with the axis parallel to the length direction of the cartridge body 31, so that the elastic body can be rotated when supported on the plurality of support frames 32, thereby facilitating alignment of the elastic body hanging ring on the elastic body with the hook on the machine body through rotation of the elastic body.

[0050] Specifically, the cartridge lifting frame 3 is fixedly connected with a plurality of lifting rods 34 on both sides. Through the arrangement of the lifting rods 34, the entire cartridge lifting frame 3 can be lifted by the cooperation of multiple operators, thereby facilitating the loading and unloading of the cartridge lifting frame 3, and multiple operators lifting the cartridge lifting frame 3 can improve the applicable types of bullets.

[0051] Specifically, the cartridge lifting frame 3 further comprises positioning pins 35 vertically penetrating the support frames 32 and the lifting frame 2. Through the arrangement of the positioning pins 35, the cartridge lifting frame 3 can be fixed on the lifting frame 2 to prevent mutual movement between the cartridge lifting frame 3 and the lifting frame 2 when the lifting mechanism 4 drives the lifting frame 2 to move up and down.

[0052] Specifically, the lifting mechanism 4 comprises a fork arm assembly, and the fork arm assembly is provided with two fork arm assemblies arranged near the two sides of the mobile base 1. The fork arm assembly comprises a first fork arm 41 and a second fork arm 42. The bottom end of the first fork arm 41 is hinged to the mobile base 1, and the top end can slide horizontally on the lifting frame 2. The top end of the second fork arm 42 is hinged to the lifting frame 2, and the bottom end can slide horizontally on the mobile base 1. The middle positions of the first fork arm 41 and the second fork arm 42 are hinged together, and the sliding direction of the bottom end of the second fork arm 42 is parallel to the sliding direction of the top end of the first fork arm 41.

[0053] Through the mutual rotation between the first fork arm 41 and the second fork arm 42 in the fork arm assembly, the distance between the top and the bottom of the fork arm can be changed, thereby driving the lifting frame 2 to move up and down through the fork arm assembly.

[0054] Specifically, the mobile base 1 comprises a bottom frame and a plurality of universal wheels 13 arranged at the bottom of the bottom frame.

[0055] Specifically, the bottom frame comprises first longitudinal beams 11 and first transverse beams 12, the first longitudinal beams 11 are arranged side by side in two and the length direction of the first longitudinal beams 11 is arranged along the length direction of the bottom frame; the first transverse beams 12 are arranged in two and are fixedly connected at two ends of the first longitudinal beams 11 respectively, and the first transverse beams 12 are arranged along the width direction of the bottom frame; the lifting frame 2 comprises second longitudinal beams 21 and second transverse beams 22, the second longitudinal beams 21 are arranged side by side in two and the length direction of the second longitudinal beams 21 is arranged along the length direction of the lifting frame 2, and the length direction of the lifting frame 2 is parallel to the length direction of the bottom frame; the second transverse beams 22 are arranged in two and are fixedly connected at two ends of the second longitudinal beams 21 respectively, and the second transverse beams 22 are arranged along the width direction of the lifting frame 2.

[0056] Specifically, a bottom end of the first fork arm 41 is hingedly connected to one of the first transverse beams 12, and a top end of the first fork arm 41 is slidingly connected to one of the second longitudinal beams 21 and slides along the length direction of the second longitudinal beam 21; a top end of the second fork arm 42 is hingedly connected to one of the second transverse beams 22, and a bottom end of the second fork arm 42 is slidingly connected to one of the first longitudinal beams 11 and slides along the length direction of the first longitudinal beam 11.

[0057] The lifting mechanism 4 further comprises an upper sliding rod 44 and a lower sliding rod 43, the upper sliding rod 44 is fixedly connected to the top end of the two first fork arms 41, both ends of the upper sliding rod 44 are fixedly provided with two bearings, and the two second longitudinal beams 21 are provided with two second sliding grooves 211 on the side close to each other, and the two bearings are embedded in the two second sliding grooves 211 respectively; the lower sliding rod 43 is fixedly connected to the bottom end of the two second fork arms 42, both ends of the lower sliding rod 43 are fixedly provided with two bearings, and the two first longitudinal beams 11 are provided with two first sliding grooves 111 on the side close to each other, and the two bearings are embedded in the two first sliding grooves 111 respectively.

[0058] Through the arrangement of the upper sliding rod 44 and the lower sliding rod 43, the top end of the two first fork arms 41 can be connected together, the synchronous sliding of the top end of the two first fork arms 41 is ensured, the bottom end of the two second fork arms 42 can be connected together, and the synchronous sliding of the bottom end of the two second fork arms 42 is ensured.

[0059] Specifically, two limiting blocks 5 are arranged in the first sliding grooves 111 and the second sliding grooves 211, through the arrangement of the limiting blocks 5, the sliding distance of the bearings in the first sliding grooves 111 and the second sliding grooves 211 can be limited.

[0060] Specific, lifting mechanism 4 further comprises mounting seat 23, lead screw 45, lead screw nut 46, transmission shaft 48 and reduction reverser 47, mounting seat 23 is fixedly connected at the bottom of two second longitudinal beams 21, both ends of lead screw 45 are hingedly connected in mounting seat 23 and second cross beam 22 close to upper slide bar 44, lead screw nut 46 is fixedly connected at the bottom of upper slide bar 44 and threadedly cooperates with lead screw 45, transmission shaft 48 is rotatably connected at the bottom of mounting seat 23 and one end of transmission shaft 48 is fixedly connected with hand wheel 49, input end of reduction reverser 47 is in transmission connection with transmission shaft 48 and output end is in transmission connection with lead screw 45.

[0061] The operator can drive lead screw 45 to rotate through reduction ring reverser, so as to drive upper slide bar 44 to slide on two second longitudinal beams 21 through the rotation of lead screw 45, and further drive lifting frame 2 to move up and down.

[0062] Specifically, lead screw 45 and reduction reverser 47, and transmission shaft 48 and reduction reverser 47 can be connected by a shaft coupling.

[0063] Specifically, two positioning plates 24 are fixedly connected at one corner of lifting frame 2, and two positioning plates 24 are fixedly connected to second longitudinal beam 21 and second cross beam 22 respectively, and the bullet supporting frame body 31 mounted on the lifting frame 2 can be positioned by the two positioning plates 24.

[0064] The working principle of the embodiment in use is as follows:

[0065] Step one, move the bullet hanging device to the bullet taking position: check the fixing of the positioning pin 35 between the bullet hanging device and the lifting frame 2, drive the bullet hanging device to the desired position by manually pushing the lifting rod 34, and operate the hand wheel 49 to lower the lifting frame 2 to the lowest position.

[0066] Step two, place and fix the bullet body: hoist the bullet body above the support frame 32, adjust the position of the bullet body slightly, so that the support frame 32 is aligned with the weighing part of the bullet body, then lower the bullet body, so that the bullet body contacts the support roller 33 on the support frame 32, then lock the universal wheel 13, and fix the bullet body on the bullet supporting lifting frame 3 by the binding belt.

[0067] Step three, move the bullet hanging device under the rack: check the bullet fixing, the positioning pin 35 fixing and the bullet hanging device, release the brake of the universal wheel 13, push the lifting rod 34 to move the bullet hanging device with bullets under the rack and lock the brake of the universal wheel 13.

[0068] Step four, height adjustment: rotate the hand wheel 49 to control the lifting frame 2, adjust the lifting frame 2 to the appropriate height to facilitate the operator to lift the bullet supporting lifting frame 3.

[0069] Step five, elastic body adjustment: untie the bandage, rotate the elastic body, and adjust the hook to the same vertical position as the hanger.

[0070] Step six, lift the hanging projectile: multiple people lift the lifting rod 34 to move the elastic body close to the hanger lock hook, connect the cable plug, lift the hook, and insert the safety pin.

[0071] Step seven, remove the hanging projectile device: return the projectile lifting frame 3 to its original position, insert the positioning pin 35, and remove the hanging projectile device.

[0072] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solution falling within the concept of the present application is within the protection scope of the present application. It should be noted that, for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principles of the present application are also considered within the protection scope of the present application.

Claims

1. A split-type bomb-hanging device, characterized by: The mobile base (1) is used for moving on the ground; The bullet carrier lifting frame (3) is used for carrying the bullet body and can be moved by manual lifting; The lifting frame (2) is arranged above the mobile base (1) and can move up and down relative to the mobile base (1), and the bullet carrier lifting frame (3) is detachably connected to the top of the lifting frame (2); And the lifting mechanism (4) is arranged between the lifting frame (2) and the mobile base (1) to drive the lifting frame (2) to move up and down above the mobile base (1).

2. The breakaway attachment of claim 1, wherein: The bullet carrier lifting frame (3) comprises a bullet carrier body (31); The support frame (32) is provided with a plurality of support frames (32) arranged along the length direction of the bullet carrier body (31), and the support frame (32) is fixedly connected to the bullet carrier body (31), and the top of the support frame (32) is provided with an arc-shaped groove (321) with an axis direction parallel to the length direction of the bullet carrier body (31); And the support roller (33) is arranged on each support frame (32), and the plurality of support rollers (33) on the support frame (32) are arranged along the circumferential direction of the arc-shaped groove (321) and are rotatably connected to the support frame (32).

3. The breakaway lanyard of claim 2, wherein: A plurality of lifting rods (34) are fixedly connected to the two sides of the bullet carrier lifting frame (3).

4. The breakaway lanyard of claim 3, wherein: The bullet carrier lifting frame (3) further comprises a plurality of positioning pins (35) vertically penetrating the support frame (32) and the lifting frame (2).

5. The breakaway lanyard of claim 1, wherein: The lifting mechanism (4) comprises a fork arm assembly, and the fork arm assembly is provided with two fork arm assemblies arranged near the two sides of the mobile base (1); The fork arm assembly comprises a first fork arm (41), the bottom end of the first fork arm (41) is hinged to the mobile base (1), and the top end can slide horizontally on the lifting frame (2); And a second fork arm (42), the top end of the second fork arm (42) is hinged to the lifting frame (2), and the bottom end can slide horizontally on the mobile base (1), the middle positions of the first fork arm (41) and the second fork arm (42) are hinged together, and the sliding direction of the bottom end of the second fork arm (42) is parallel to the sliding direction of the top end of the first fork arm (41).

6. The breakaway lanyard of claim 5, wherein: The mobile base (1) comprises a bottom frame; And the universal wheel (13) is provided with a plurality of universal wheels (13) arranged at the bottom of the bottom frame.

7. The breakaway lanyard of claim 6, wherein: The bottom frame comprises a first longitudinal beam (11), the first longitudinal beam (11) is provided with two first longitudinal beams (11) arranged side by side, and the length direction of the first longitudinal beam (11) is arranged along the length direction of the bottom frame; And a first cross beam (12), the first cross beam (12) is provided with two first cross beams (12) fixedly connected to the two ends of the first longitudinal beam (11), and the first cross beam (12) is arranged along the width direction of the bottom frame; The lifting frame (2) comprises two second longitudinal beams (21) arranged side by side and arranged along the length direction of the lifting frame (2), and the length direction of the lifting frame (2) is parallel to the length direction of the bottom frame. Two second cross beams (22) are arranged, and the two second cross beams (22) are fixedly connected to the two ends of the second longitudinal beams (21), respectively, and the second cross beams (22) are arranged along the width direction of the lifting frame (2).

8. The breakaway lanyard of claim 7, wherein: The bottom end of the first fork arm (41) is hingedly connected to one of the first cross beams (12), and the top end of the first fork arm (41) is slidingly connected to one of the second longitudinal beams (21) and slides along the length direction of the second longitudinal beam (21). The top end of the second fork arm (42) is hingedly connected to one of the second cross beams (22), and the bottom end of the second fork arm (42) is slidingly connected to one of the first longitudinal beams (11) and slides along the length direction of the first longitudinal beam (11).

9. The breakaway lanyard of claim 8, wherein: The lifting mechanism (4) further comprises an upper sliding rod (44) fixedly connected to the top end of the two first fork arms (41), and the two ends of the upper sliding rod (44) are fixedly provided with two bearings, respectively. The two second longitudinal beams (21) are provided with two second sliding grooves (211) on the side close to each other, and the two bearings are embedded in the two second sliding grooves (211), respectively.

10. The breakaway lanyard of claim 9, wherein: The lifting mechanism (4) further comprises a lower sliding rod (43) fixedly connected to the bottom end of the two second fork arms (42), and the two ends of the lower sliding rod (43) are fixedly provided with two bearings, respectively. The two first longitudinal beams (11) are provided with two first sliding grooves (111) on the side close to each other, and the two bearings are embedded in the two first sliding grooves (111), respectively. The lifting mechanism (4) further comprises a mounting seat (23) fixedly connected to the bottom of the two second longitudinal beams (21); A lead screw (45) is hingedly connected to the mounting seat (23) and the second cross beam (22) close to the upper sliding rod (44) at the two ends, respectively; A lead screw nut (46) is fixedly connected to the bottom of the upper sliding rod (44) and threadedly matched with the lead screw (45); A transmission shaft (48) is rotatably connected to the bottom of the mounting seat (23), and one end of the transmission shaft (48) is fixedly connected with a hand wheel (49); And a speed reducer (47) is drivingly connected at the input end of the transmission shaft (48) and drivingly connected at the output end of the lead screw (45).

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