Retractable self-moving cantilever crane

Abstract

The invention relates to the technical field of cranes, in particular to a retractable self-moving type cantilever crane which comprises a moving seat, a walking wheel set, a base, a supporting column, a rotating seat, a cantilever and a lifting hoist. The automatic supporting piece comprises four strip-shaped shells fixed to the bottom face of the moving base and distributed in a convolution mode, transmission pieces sliding along the side walls of the strip-shaped shells, supporting mechanisms sliding along inner cavities of the strip-shaped shells and provided with supporting discs at the outer ends and a driving mechanism synchronously driving the four supporting mechanisms to move through the transmission pieces, and the supporting mechanisms can move downwards when sliding outwards. The adjusting seat comprises a U-shaped seat fixed at the top of the rotary seat; the counterweight mechanism comprises a short beam clamped in the U-shaped seat in a sliding mode and a counterweight plate arranged on one side of the short beam, an open groove hinged to the inner end of the cantilever is formed in one side of the short beam, and the swinging telescopic cylinder drives the cantilever to swing up and down; a transmission mechanism for driving the short beam to slide horizontally is arranged on the outer side of the adjusting seat; the movable crane can be conveniently and rapidly fixed and supported after moving, and the phenomenon that the cantilever is damaged during moving is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of cranes, in particular to a retractable self-moving cantilever crane. Background Art

[0002] A jib crane is a type of lifting equipment widely used in industrial production, logistics warehousing, and construction. Its core function is to achieve precise lifting of materials through a cantilever structure. The working principle of a cantilever crane is based on the principle of leverage and gravity balance. The material handling is mainly completed by an electric motor driving the cantilever rotation and lifting mechanism. Its core components include: support columns (fixed to the ground or wall to provide stable support), cantilever (horizontally or tilted, rotatable 270-360°, with an electric hoist or chain lifting device connected to the end), electric hoist (vertical lifting of heavy objects by winding a wire rope around a drum), and control system (manually or remotely controlled to coordinate cantilever rotation and lifting actions). Among them, the mobile cantilever crane has wheels or rails at the bottom, which can flexibly adjust the working position and is suitable for large warehouses or dynamic workstations.

[0003] However, the currently commonly used mobile cantilever cranes are often not convenient to be quickly fixed and supported after being moved, and the cantilever is prone to conflict with other structures during movement, which can easily cause damage to the cantilever. Summary of the Invention

[0004] The object of the present invention is to provide a retractable self-moving cantilever crane, which is used to solve the problems in the prior art that the cantilever of mobile cranes is easily damaged when moving and is difficult to quickly fix and support after moving.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a retractable self-moving cantilever crane, comprising a moving seat, a walking wheel group installed at the four corners of the moving seat, a base fixed to the top surface of the moving seat, a pillar with its bottom end fixed to the top of the base, a swivel seat provided at the top of the pillar, a cantilever and a lifting hoist provided on the cantilever, the automatic support member comprises four strip shells distributed in a spiral shape and respectively fixed to the bottom surface of the moving seat near the middle, transmission members respectively sliding axially along the side walls of the strip shells, a support mechanism sliding axially along the inner cavity of the strip shells, and a device for synchronously driving the four supports through the transmission member. The driving mechanism of the telescopic movement of the support mechanism, the outer end of the support mechanism is provided with a support plate, and the support mechanism has a downward displacement when sliding outward along the strip shell; the adjustment seat includes a U-shaped seat fixed to the top of the swivel seat; the counterweight mechanism includes a short beam that is slidably mounted in the inner cavity of the U-shaped seat in the horizontal direction and a counterweight plate installed on one side of the short beam, the middle part of the short beam is provided with an open groove on the side away from the counterweight plate, and the inner end of the cantilever is hinged in the open groove; the swing telescopic cylinder is used to drive the cantilever to swing up and down relative to the short beam; the outer side of the adjustment seat is provided with a transmission mechanism that drives the short beam to slide horizontally.

[0006] Preferably, the strip-shaped shell includes a rectangular tube and a connecting plate arranged on the top of the rectangular tube and fixedly connected to the bottom surface of the movable seat; the middle part of the inner wall of the rectangular tube is provided with a sliding groove along its axial direction for sliding engagement with the transmission member; the bottom plate of the rectangular tube is provided with a bottom groove along its axial direction near the outer side for sliding engagement with the top of the support plate; the outer end of the top surface of the inner cavity of the rectangular tube is provided with a downward pressing protrusion for pressing the supporting mechanism downward; and a slope for transition is provided between the downward pressing protrusion and the inner top surface of the inner cavity of the rectangular tube.

[0007] The axle up and down groove at two ends embeds respectively in two guide rails up and down of being made up of the groove on the attachment piece, and the tooth on the attachment piece is meshed with tooth on upper sprocket wheel, the lower sprocket.

[0008] Preferably, a ball joint is provided between the bottom end of the support rod and the middle portion of the top surface of the support plate.

[0009] Preferably, the top of the outer end of the beam is configured as an arc surface structure, and a wheel groove is provided in the middle of the arc surface structure, a roller is rotatably installed in the wheel groove, and the top end of the roller is tangent to the top surface of the beam.

[0010] Preferably, a plurality of linear bearings are fixedly sleeved vertically on one inner end of the beam and are respectively matched with the support rods in a sliding sleeve manner.

[0011] Preferably, a side groove one extending in the horizontal direction is provided in the middle of one side wall of the inner cavity of the U-shaped seat, and a side groove three is provided on the outer side wall of the U-shaped seat corresponding to the position in the middle of the side groove one, and a motor two is installed on the upper side of the side groove three, and the bottom end of the power output shaft of the motor two is fixedly sleeved with a side gear extending into the side groove one through the side groove three, and a rack two is fixed on one side wall of the short beam, which is slidably engaged with the side groove one and meshing with the side gear.

[0012] Preferably, a side groove 2 extending in the horizontal direction is provided in the middle of the other side wall of the inner cavity of the U-shaped seat, and a plurality of guide wheels rolling along the bottom surface of the inner cavity of the side groove 2 are rotatably mounted on the other side wall of the short beam. The top and bottom parts of the front and rear walls of the short beam away from one end of the counterweight plate are respectively provided with blocks, and a columnar seat is vertically fixed in the middle of the top surface of the short beam, the top end of which is hinged to the top end of the swing telescopic cylinder.

[0013] Preferably, the cantilever includes an articulated seat whose inner end is hinged to the inner end of the inner cavity of the open groove, a connecting beam fixedly docked to the outer end of the articulated seat, and a support beam fixedly docked to the outer end of the connecting beam and used to support the lifting hoist. An ear seat hinged to the bottom end of the swing telescopic cylinder is fixed in the middle of the top surface of the inner end of the articulated seat.

[0014] Preferably, the lifting hoist is a mobile electric hoist, and the support beam is provided with a track that matches the moving part of the lifting hoist.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention relates to a retractable self-moving cantilever crane that can easily fold and retract the cantilever during transfer, thereby effectively preventing the cantilever from colliding with other structures during the movement of the crane.

[0017] 2. The retractable self-moving cantilever crane of the present invention facilitates rapid support and fixation of the crane through automatic support members after being transferred to a position, thereby improving the convenience of equipment use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0019] Figure 2 Schematic diagram of the three-dimensional structure of the cantilever of the present invention;

[0020] Figure 3 Schematic diagram of the three-dimensional structure of the automatic support member of the present invention;

[0021] Figure 4 This is a schematic diagram of the first three-dimensional structure of the strip-shaped housing of the present invention;

[0022] Figure 5 This is a schematic diagram of a second three-dimensional structure of the strip-shaped housing of the present invention;

[0023] Figure 6 Schematic diagram of the three-dimensional structure of the transmission member of the present invention;

[0024] Figure 7 Schematic diagram of the three-dimensional structure of the support mechanism of the present invention;

[0025] Figure 8 Schematic diagram of the three-dimensional structure of the driving mechanism of the present invention;

[0026] Figure 9 This is a schematic diagram of the three-dimensional structure of the adjustment seat of the present invention;

[0027] Figure 10 It is a schematic diagram of the three-dimensional structure of the counterweight mechanism of the present invention.

[0028] In the figure: 1- base;

[0029] 2- Pillar;

[0030] 3-Swivel seat;

[0031] 4-cantilever; 4.1-articulated seat; 4.2-connecting beam; 4.3-support beam; 4.4-ear seat;

[0032] 5-Lifting hoist;

[0033] 6-Mobile seat;

[0034] 7-Travel wheel set;

[0035] 8 - Automatic support; 8.1 - Strip housing; 8.1.1 - Rectangular tube; 8.1.1.1 - Slideway; 8.1.1.2 - Downward pressing protrusion; 8.1.1.3 - Inclined surface; 8.1.1.4 - Bottom groove; 8.1.2 - Connecting plate; 8.2 - Transmission element; 8.2.1 - Rack 1; 8.2.2 - L-shaped plate; 8.2.3 - Guide rod; 8.2.4 - Spring; 8.3 - Support mechanism; 8.3.1 - Beam 1; 8.3.1.1 - Wheel groove; 8.3.2 - Beam 2; 8.3.3 - Support rod; 8.3.4 - Support plate; 8.3.5 - Linear bearing; 8.3.6 - Roller; 8.3.7 - Ball joint; 8.4 - Drive mechanism; 8.4.1 - Motor 1; 8.4.2 - Shaft; 8.4.3 - Center gear;

[0036] 9-Adjustment seat; 9.1-U-shaped seat; 9.1.1-Side slot 1; 9.1.2-Side slot 2; 9.1.3-Side slot 3; 9.2-Motor 2; 9.3-Side gear;

[0037] 10-Counterweight mechanism; 10.1-Short beam; 10.1.1-Open slot; 10.1.2-Block; 10.2-Counterweight plate; 10.3-Rack 2; 10.4-Guide wheel; 10.5-Column seat;

[0038] 11-Swing telescopic cylinder. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] See also Figure 1-10 The present invention provides a technical solution, a retractable self-moving cantilever crane, a traveling wheel group 7 at the four corners of the moving seat 6, and the traveling wheel group 7 includes a drive motor, a reducer, a traveling wheel and a commutator to facilitate the movement of the moving seat 6.

[0041] The base 1 is a prism-shaped structure, bolted centrally to the top surface of the mobile base 6. The support 2 is a cylindrical structure, with the bottom end bolted to the top surface of the base 1. The slewing base 3 is assembled on the top of the support 2 and uses a rotary gear transmission structure to achieve horizontal rotation of the top.

[0042] Adjustment base 9 comprises a U-shaped base 9.1 fixed to the top of swivel base 3. A horizontally extending side groove 1 9.1.1 is provided in the middle of one side wall of the inner cavity of U-shaped base 9.1. A side groove 3 9.1.3 is provided on the outer wall of U-shaped base 9.1, corresponding to the middle of side groove 1 9.1.1. Motor 2 9.2 is mounted above side groove 3 9.1.3. A side gear 9.3 is fixedly mounted on the bottom end of the power output shaft of motor 2 9.2, extending through side groove 3 9.1.3 and into side groove 1 9.1.1. A horizontally extending side groove 2 9.1.2 is provided in the middle of the other side wall of the inner cavity of U-shaped base 9.1.

[0043] The counterweight mechanism 10 comprises a short beam 10.1 that slides horizontally within the interior of the U-shaped seat 9.1, and a counterweight plate 10.2 mounted to one side of the short beam 10.1. An open slot 10.1.1 is provided in the middle of the short beam 10.1, away from the counterweight plate 10.2. A rack 10.3 is fixed to one side wall of the short beam 10.1, which slides into the first side slot 9.1.1 and meshes with the side gear 9.3. A plurality of guide wheels 10.4 are rotatably mounted on the other side wall of the short beam 10.1, rolling along the bottom surface of the second side slot 9.1.2. Stoppers 10.1.2 are provided at the top and bottom of the front and rear walls of the short beam 10.1, away from the counterweight plate 10.2. A columnar seat 10.5 is vertically fixed to the middle of the top surface of the short beam 10.1. Motor 2 9.2 drives the counterweight mechanism 10 to slide horizontally in the U-shaped seat 9.1 through the side gear 9.3 and the rack 2 10.3, wherein the guide wheel 10.4 plays a balancing, drag reduction and guiding role to ensure the smooth translation of the counterweight mechanism 10.

[0044] Cantilever 4 comprises an articulated base 4.1, its inner end hinged to the inner end of open slot 10.1.1; a connecting beam 4.2 fixedly docked to the outer end of articulated base 4.1; and a support beam 4.3 fixedly docked to the outer end of connecting beam 4.2 and used to support the hoist 5. An ear 4.4 is fixed to the center of the top surface of the inner end of articulated base 4.1. The hoist 5 is a mobile electric hoist, and support beam 4.3 is equipped with a track that matches the moving part of hoist 5. This allows hoist 5 to slide along support beam 4.3 to adjust the lifting point.

[0045] The automatic support member 8 comprises four strip-shaped housings 8.1 distributed in a spiral pattern and fixed to the bottom surface of the movable base 6 near the middle; transmission members 8.2 that slide axially along the side walls of the strip-shaped housings 8.1; support mechanisms 8.3 that slide axially along the inner cavity of the strip-shaped housings 8.1; and drive mechanisms 8.4 for synchronously driving the telescopic movement of the four support mechanisms 8.3 via the transmission members 8.2. Support plates 8.3.4 are provided at the outer ends of the support mechanisms 8.3, so that the support mechanisms 8.3 have a downward displacement when sliding outward along the strip-shaped housing 8.1. The strip-shaped housing 8.1 comprises a rectangular tube 8.1.1 and a connecting plate 8.1.2 disposed on the top of the rectangular tube 8.1.1 and fixedly connected to the bottom surface of the movable seat 6. A sliding groove 8.1.1.1 is provided in the middle of the inner side wall of the rectangular tube 8.1.1 along its axial direction for sliding engagement with the transmission member 8.2. A bottom groove 8.1.1.4 is provided in the bottom plate of the rectangular tube 8.1.1 near the outer side along its axial direction for sliding engagement with the top of the support plate 8.3.4. A downward pressing protrusion 8.1.1.2 is provided at the outer end of the top surface of the inner cavity of the rectangular tube 8.1.1 for pressing downward the support mechanism 8.3. A slope 8.1.1.3 for transition is provided between the downward pressing protrusion 8.1.1.2 and the inner top surface of the inner cavity of the rectangular tube 8.1.1. The transmission member 8.2 includes a rack 8.2.1 that is slidably engaged in the chute 8.1.1.1, an L-shaped plate 8.2.2 that is fixed to the inner side wall of the rack 8.2.1 and slides with the inner cavity of the rectangular tube 8.1.1, a plurality of guide rods 8.2.3 whose bottom ends are vertically fixed to the top surface of the bottom plate of the L-shaped plate 8.2.2, and a spring 8.2.4 that is sleeved on the outside of the guide rods 8.2.3. The support mechanism 8.3 includes a beam 8.3.1 whose inner end is vertically slidably sleeved on the top of the guide rod 8.2.3, a beam 8.3.1 that is fixedly docked to the bottom of the outer end of the beam 8.3.1, and a spring 8.2.4 that is sleeved on the outside of the guide rods 8.2.3. 8.3.2 and a support rod 8.3.3 vertically fixed to the outer end of beam 2 8.3.2 and slidingly engaged with bottom groove 8.1.1.4. The middle portion of the top surface of support plate 8.3.4 is connected to the bottom end of support rod 8.3.3. Drive mechanism 8.4 includes motor 1 8.4.1 fixed to the top surface of movable base 6, shaft 8.4.2 fixedly docked to the bottom end of the power output shaft of motor 1 8.4.1 and rotatably sleeved with the center of movable base 6, and central gear 8.4.3 fixedly sleeved to the bottom end of shaft 8.4.2 and meshing with four racks 1 8.2.1. A ball joint 8.3.7 is provided between the bottom end of support rod 8.3.3 and the middle portion of the top surface of support plate 8.3.4.

[0046] The telescopic swing cylinder 11 is used to drive the cantilever 4 to swing up and down relative to the short beam 10.1; wherein, the top end of the piston cylinder of the telescopic swing cylinder 11 is hinged to the top end of the columnar seat 10.5, and the bottom end of the piston rod of the telescopic swing cylinder 11 is hinged to the ear seat 4.4.

[0047] In summary, when the crane is relocated as a whole, the first beam 8.3.1 and the second beam 8.3.2 of the support mechanism 8.3 are retracted into the inner cavity of the rectangular tube 8.1.1, and the bottom surface of the support plate 8.3.4 is off the ground.

[0048] Motor 2 (9.2) drives the counterweight mechanism (10) through side gear (9.3) and rack (10.3) to slide in the direction of extension of the boom (4). Once the hinged connection between the articulated seat (4.1) and the open slot (10.1.1) has extended from the interior of the U-shaped seat (9.1), releasing the support provided by the bottom surface of the articulated seat (4.1). At this point, the telescopic cylinder (11) extends, causing the boom (4) to tilt and fold downward. Once the boom (4) is folded and retracted, the traveling wheel assembly (7) can then carry the entire crane for relocation.

[0049] After the crane moves to the set position, motor 1 (8.4.1) drives central gear 8.4.3, which in turn drives four racks (8.2.1) to slide outward along their corresponding chutes (8.1.1.1). Simultaneously, L-shaped plates (8.2.2) slide outward along the inner cavity of rectangular tube (8.1.1). Racks (8.2.1) push the entire support mechanism (8.3) outward via L-shaped plates (8.2.2) and guide rods (8.2.3). Beams (8.3.1) and (8.3.2) slide outward along the inner cavity of rectangular tube (8.1.1), while support rods (8.3.3) slide outward along bottom grooves (8.1.1.4). When the outer top of beam 1 (8.3.1) contacts the inclined surface (8.1.1.3), the inner end of beam 1 (8.3.1) gradually compresses springs (8.2.4), causing it to move downward. Until the outer end of the first beam 8.3.1 slides to the lower side of the downward pressing protrusion 8.1.1.2, the second beam 8.3.2 extends from the rectangular tube 8.1.1, and the bottom surface of the support plate 8.3.4 is supported on the ground to complete the support and fixation of the crane.

[0050] The telescopic cylinder 11 then contracts, causing the boom 4 to swing upward to a horizontal position. Motor 2 9.2 then drives the counterweight mechanism 10, via side gear 9.3 and rack 2 10.3, to slide toward the counterweight plate 10.2 until the bottom surface of the articulated seat 4.1 is fully supported on the inner bottom surface of the U-shaped seat 9.1. This completes the crane's post-relocation preparations, facilitating the next step of hoisting.

[0051] See more details Figure 7 The top of the outer end of beam 1 8.3.1 is designed as a curved surface, with a wheel groove 8.3.1.1 in the middle of the curved surface. A roller 8.3.6 is rotatably mounted in the wheel groove 8.3.1.1. The top of roller 8.3.6 is tangential to the top surface of beam 1 8.3.1. This means that when the top of the outer end of beam 1 8.3.1 is supported on the inclined surface 8.1.1.3, roller 8.3.6 directly contacts the inclined surface 8.1.1.3, significantly reducing resistance to movement.

[0052] In addition, in order to further ensure that the beam 1 8.3.1 can move downward smoothly when the outer end of the beam 1 8.3.1 is subjected to downward pressure, the inner end of the beam 1 8.3.1 is vertically fixed with a plurality of linear bearings 8.3.5 that are respectively slidably connected with the support rods 8.3.3.

[0053] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0054] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A retractable self-moving cantilever crane, comprising a moving seat (6), a walking wheel group (7) installed at the four corners of the moving seat (6), a base (1) fixed to the top surface of the moving seat (6), a pillar (2) with its bottom end fixed to the top of the base (1), a slewing seat (3) provided at the top of the pillar (2), a cantilever (4) and a lifting hoist (5) provided on the cantilever (4), characterized in that: Also includes: An automatic support member (8), the automatic support member (8) comprising four strip-shaped shells (8.1) distributed in a spiral shape and respectively fixed to the bottom surface of the movable seat (6) near the middle, transmission members (8.2) respectively sliding axially along the side walls of the strip-shaped shells (8.1), a support mechanism (8.3) sliding axially along the inner cavity of the strip-shaped shell (8.1), and a drive mechanism (8.4) for synchronously driving the four support mechanisms (8.3) to telescopically move through the transmission members (8.2), a support disc (8.3.4) being provided at the outer end of the support mechanism (8.3), and the support mechanism (8.3) having a downward displacement when sliding outward along the strip-shaped shell (8.1); An adjustment seat (9), the adjustment seat (9) comprising a U-shaped seat (9.1) fixed to the top of the rotary seat (3); A counterweight mechanism (10), the counterweight mechanism (10) comprising a short beam (10.1) slidably mounted in the inner cavity of the U-shaped seat (9.1) in a horizontal direction and a counterweight plate (10.2) mounted on one side of the short beam (10.1); an open slot (10.1.1) is provided on a side of the middle of the short beam (10.1) away from the counterweight plate (10.2); and the inner end of the cantilever (4) is hinged in the open slot (10.1.1); A swing telescopic cylinder (11), the swing telescopic cylinder (11) is used to drive the cantilever (4) to swing up and down relative to the short beam (10.1); A transmission mechanism for driving the short beam (10.1) to slide horizontally is provided on the outside of the adjustment seat (9).

2. The retractable self-propelled jib crane according to claim 1, characterized in that: The strip-shaped shell (8.1) comprises a rectangular tube (8.1.1) and a 8.1.1) is provided with a connecting plate (8.1.2) fixedly connected to the bottom surface of the movable seat (6), and a sliding groove (8.1.2) is provided in the middle of the inner wall of the rectangular tube (8.1.1) along its axial direction for sliding engagement with the transmission member (8.2). 8.1.1.1), the bottom plate of the rectangular tube (8.1.1) is provided with a bottom groove (8.1.1) along its axial direction near the outer side thereof, which is slidably engaged with the top of the support plate (8.3.4). 8.1.1.4), the outer end of the inner cavity top surface of the rectangular tube (8.1.1) is provided with a downward pressing convex portion ( 8.1.1.2), the downward pressing convex portion ( A slope (8.1.1.3) for transition is provided between the inner top surface of the inner cavity of the rectangular tube (8.1.1) and the inner top surface of the rectangular tube (8.1.1).

3. A retractable self-moving cantilever crane according to claim 2, characterized in that: the transmission member (8.2) includes a sliding clamp connected to the slide groove ( The rack 1 (8.2.1) in 8.1.1.1) is fixed to the inner side wall of the rack 1 (8.2.1) and is slidably connected to the inner cavity of the rectangular tube (8.1.1) L-shaped plate (8.2.2), multiple bottom ends of which are vertically fixed to the top surface of the bottom plate of the L-shaped plate (8.2.2) and springs (8.2.4) sleeved on the outside of the guide rods (8.2.3), the support mechanism (8.3) includes a beam 1 (8.3.1) whose inner end is vertically slidably connected to the top of the guide rod (8.2.3), a beam 2 (8.3.2) fixedly docked to the bottom of the outer end of the beam 1 (8.3.1) and a spring (8.2.4) fixed vertically. A support rod (8.3.3) is fixed at the outer end of the second beam (8.3.2) and is slidably engaged with the bottom groove (8.1.1.4); the middle part of the top surface of the support plate (8.3.4) is connected to the bottom end of the support rod (8.3.3); the driving mechanism (8.4) includes a motor (8.4.1) fixed to the top surface of the moving seat (6), a shaft (8.4.2) fixedly docked to the bottom end of the power output shaft of the motor (8.4.1) and rotatably sleeved with the center of the moving seat (6); and a central gear (8.4.3) fixedly sleeved on the bottom end of the shaft (8.4.2) and simultaneously meshed with the four racks (8.2.1).

4. The retractable self-propelled jib crane according to claim 3, characterized in that: A ball joint (8.3.7) is provided between the bottom end of the support rod (8.3.3) and the middle of the top surface of the support plate (8.3.4).

5. The retractable self-propelled jib crane according to claim 3, characterized in that: The top of the outer end of the beam one (8.3.1) is set as an arc surface structure, and a wheel groove (8.3.1.1) is provided in the middle of the arc surface structure. A roller (8.3.6) is rotatably installed in the wheel groove (8.3.1.1), and the top of the roller (8.3.6) is tangent to the top surface of the beam one (8.3.1).

6. The retractable self-propelled jib crane according to claim 3, characterized in that: The inner end of the beam 1 (8.3.1) is fixedly sleeved vertically with a plurality of linear bearings (8.3.5) respectively slidingly sleeved and matched with the support rods (8.3.3).

7. The retractable self-propelled jib crane according to claim 1, characterized in that: A side groove 1 (9.1.1) extending in the horizontal direction is provided in the middle of one side wall of the inner cavity of the U-shaped seat (9.1), and a side groove 3 (9.1.3) is provided on the outer wall of the U-shaped seat (9.1) at a position corresponding to the middle of the side groove 1 (9.1.1). Motor 2 (9.2) is installed on the upper side of the side groove 3 (9.1.3), and a side gear (9.3) is fixedly sleeved on the bottom end of the power output shaft of the motor 2 (9.2) and extends into the side groove 1 (9.1.1) through the side groove 3 (9.1.3). A rack 2 (10.3) is fixed on one side wall of the short beam (10.1) and is slidably engaged with the side groove 1 (9.1.1) and meshed with the side gear (9.3).

8. The retractable self-propelled jib crane according to claim 7, characterized in that: A second side groove (9.1.2) extending in the horizontal direction is provided in the middle of the other side wall of the inner cavity of the U-shaped seat (9.1); a plurality of guide wheels (10.4) rolling along the bottom surface of the inner cavity of the second side groove (9.1.2) are rotatably mounted on the other side wall of the short beam (10.1); stoppers (10.1.2) are provided at the top and bottom of the front and rear walls of one end of the short beam (10.1) away from the counterweight plate (10.2); and a columnar seat (10.5) is vertically fixed in the middle of the top surface of the short beam (10.1), the top end of which is hinged to the top end of the swing telescopic cylinder (11).

9. The retractable self-propelled jib crane according to claim 1, characterized in that: The cantilever (4) includes an articulated seat (4.1) whose inner end is hinged to the inner end of the inner cavity of the opening groove (10.1.1), a connecting beam (4.2) fixedly docked to the outer end of the articulated seat (4.1), and a supporting beam (4.3) fixedly docked to the outer end of the connecting beam (4.2) and used to support the lifting hoist (5), and an ear seat (4.4) hinged to the bottom end of the swing telescopic cylinder (11) is fixed to the middle of the top surface of the inner end of the articulated seat (4.1).

10. The retractable self-propelled jib crane according to claim 9, characterized in that: The lifting hoist (5) is a mobile electric hoist, and the support beam (4.3) is provided with a track that matches the moving part of the lifting hoist (5).

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