A retractable lifting structure and a practical crane

Abstract

The present invention discloses a retractable lifting structure and a practical crane, and relates to the field of material handling machinery. The retractable lifting structure comprises a base, a lifting arm, a screw mechanism, a telescopic arm and an extension arm. A first cavity is provided in the lifting arm, the screw mechanism is installed in the first cavity, the telescopic arm is connected to the lifting arm through the screw mechanism, the telescopic arm can extend or retract into the first cavity, one end of the telescopic arm away from the lifting arm is hinged to the extension arm, a second cavity is provided in the telescopic arm, the extension arm can rotate relative to the telescopic arm and retract into the second cavity. Compared with the prior art, the retractable lifting structure provided by the present invention adopts a lifting arm provided with a first cavity and a telescopic arm provided with a second cavity, so that the telescopic arm equipped with the extension arm can be retracted into the lifting arm when not in use, so as to achieve complete folding and contraction, occupying a small space, being easy to operate, convenient to transport, having strong practicality, and being suitable for narrow spaces.

Description

Technical Field

[0001] The present invention relates to the field of material handling machinery, and in particular to a retractable lifting structure and a practical crane. Background Art

[0002] A crane is a multi-action lifting machine that can lift and carry heavy objects vertically and horizontally within a certain range. There are many types of cranes now, including mobile cranes, bridge cranes and tower cranes. Mobile cranes include tire cranes. The main feature of tire cranes is that the driving cab and the lifting control cab are combined into one. Tire cranes are evolved from crawler cranes. The crawler and traveling bracket parts of the traveling mechanism are changed into a chassis with tires, which overcomes the disadvantage of crawler cranes' crawler plates causing damage to the road surface, and can also achieve rapid transportation of materials.

[0003] The inventor has found that the current tire crane has a complex structure and a large size, and occupies a large space when not performing lifting operations. Therefore, it requires a large load-bearing vehicle body, has a high manufacturing cost, and is not suitable for transportation and lifting operations in a small space.

[0004] In view of this, it is particularly important to design and manufacture a retractable lifting structure and a practical crane that occupies a small space, especially in the production of lifting machinery. Summary of the invention

[0005] The object of the present invention is to provide a retractable lifting structure with a simple structure, which can be folded and retracted when not in use, occupies a small space, is easy to operate, convenient to transport, has strong practicality, and is suitable for narrow spaces.

[0006] Another object of the present invention is to provide a practical crane, in which the retractable lifting structure is simple in structure, can be folded and retracted when not in use, occupies a small space, is easy to operate, easy to transport, has strong practicality, and is suitable for small spaces.

[0007] The present invention is achieved by adopting the following technical solutions.

[0008] A retractable lifting structure comprises a base, a lifting arm, a screw mechanism, a telescopic arm and an extension arm, wherein the base is hinged to the lifting arm, a first cavity is arranged in the lifting arm, the screw mechanism is installed in the first cavity, the telescopic arm is connected to the lifting arm through the screw mechanism, the telescopic arm can be extended or retracted into the first cavity, one end of the telescopic arm away from the lifting arm is hinged to the extension arm, a second cavity is arranged in the telescopic arm, the extension arm can rotate relative to the telescopic arm and retract into the second cavity.

[0009] Furthermore, the screw mechanism includes a drive motor, a screw body and a ball sleeve. The drive motor is fixedly installed in the first cavity and connected to the screw body. The ball sleeve is sleeved outside the screw body and threadedly connected to the screw body. The ball sleeve is fixedly connected to the telescopic arm.

[0010] Furthermore, the ball sleeve includes a sleeve portion and a ball body, the sleeve portion is provided with a thread matching the screw body, the ball body is installed between the sleeve portion and the screw body, and the outer wall of the sleeve portion is fixedly connected to the telescopic arm.

[0011] Furthermore, there are two lead screw mechanisms, which are arranged oppositely on two sides of the telescopic arm.

[0012] Furthermore, the telescopic arm is U-shaped, comprising a first side wall, a bottom wall and a second side wall, one side of the bottom wall is connected to the first side wall, and the other side is connected to the second side wall, the first side wall, the bottom wall and the second side wall are combined to form a second cavity, and the bottom wall is hinged to the extension arm.

[0013] Furthermore, the bottom wall includes a bottom wall body and an articulated seat, one end of the bottom wall body is connected to the articulated seat, and the other end is connected to the screw mechanism, and the articulated seat is articulated to the extension arm.

[0014] Furthermore, the articulated seat includes a first mounting platform, a second mounting platform and a rotating shaft. The first mounting platform and the second mounting platform are arranged opposite to each other and are both fixedly connected to the bottom wall body. One end of the rotating shaft is fixedly connected to the first mounting platform, and the other end is fixedly connected to the second mounting platform. The extension arm is sleeved outside the rotating shaft and is rotatably connected to the rotating shaft.

[0015] Furthermore, the extension arm comprises an arm body and a hook, one end of the arm body is hinged to the telescopic arm, and the other end of the arm body is hinged to the hook.

[0016] Furthermore, the retractable lifting structure also includes a hydraulic support arm, which includes a support column, an accommodating sleeve and a hydraulic component. The support column is connected to the accommodating sleeve through the hydraulic component. The support column is arranged in the accommodating sleeve and can extend or retract into the accommodating sleeve. The end of the support column away from the accommodating sleeve is hinged to the lifting arm, and the accommodating sleeve is fixedly connected to the base.

[0017] A practical crane comprises a vehicle body, a rotating platform and a retractable lifting structure. The rotating platform is mounted on the vehicle body and can rotate relative to the vehicle body. The retractable lifting structure comprises a base, a lifting arm, a screw mechanism, a telescopic arm and an extension arm. The base is fixedly mounted on the rotating platform, the base is hinged to the lifting arm, a first cavity is arranged in the lifting arm, the screw mechanism is mounted in the first cavity, the telescopic arm is connected to the lifting arm through the screw mechanism, the telescopic arm can extend or retract into the first cavity, one end of the telescopic arm away from the lifting arm is hinged to the extension arm, a second cavity is arranged in the telescopic arm, the extension arm can rotate relative to the telescopic arm and retract into the second cavity.

[0018] The retractable lifting structure and the practical crane provided by the present invention have the following beneficial effects:

[0019] The retractable lifting structure provided by the present invention has a first cavity provided in the lifting arm, a screw mechanism is installed in the first cavity, a telescopic arm is connected to the lifting arm through the screw mechanism, the telescopic arm can extend or retract into the first cavity, one end of the telescopic arm away from the lifting arm is hinged to the extension arm, a second cavity is provided in the telescopic arm, the extension arm can rotate relative to the telescopic arm and retract into the second cavity. Compared with the prior art, the retractable lifting structure provided by the present invention adopts a lifting arm provided with a first cavity and a telescopic arm provided with a second cavity, so that the telescopic arm equipped with the extension arm can be retracted into the lifting arm when not in use, so as to achieve complete folding and contraction, occupying a small space, being easy to operate, convenient to transport, having strong practicality, and being suitable for narrow spaces.

[0020] The practical crane provided by the present invention comprises a retractable lifting structure. The retractable lifting structure has a simple structure and can retract a telescopic arm equipped with an extension arm into the lifting arm when not in use, so as to achieve complete folding and contraction. It occupies a small space, is easy to operate, convenient to transport, has strong practicality, and is suitable for narrow spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic structural diagram of a practical crane provided by an embodiment of the present invention;

[0023] Figure 2 A schematic structural diagram of a retractable lifting structure provided by an embodiment of the present invention;

[0024] Figure 3A schematic diagram of the structure of the connection between the lifting arm and the telescopic arm in the retractable lifting structure provided in an embodiment of the present invention;

[0025] Figure 4 for Figure 3 Structural diagram of the middle screw mechanism;

[0026] Figure 5 for Figure 4 Schematic diagram of the structure of the middle ball bushing;

[0027] Figure 6 A schematic diagram of the structure of the articulated telescopic arm and the extension arm in the retractable lifting structure provided by an embodiment of the present invention;

[0028] Figure 7 A schematic structural diagram of a hydraulic support arm in a retractable lifting structure provided in an embodiment of the present invention.

[0029] Icons: 10-practical crane; 100-retractable lifting structure; 110-base; 120-lifting arm; 121-slide rail; 130-screw mechanism; 131-drive motor; 132-screw body; 133-ball sleeve; 134-sleeve part; 135-ball body; 140-telescopic arm; 141-slider; 142-first side wall; 143-bottom wall; 144-second side Wall; 145-bottom wall body; 146-hinge seat; 1461-first mounting platform; 1462-second mounting platform; 1463-rotating shaft; 150-extension arm; 151-arm body; 152-hook; 160-hydraulic support arm; 161-support column; 162-accommodating sleeve; 163-hydraulic part; 170-first cavity; 180-second cavity; 200-vehicle body; 300-rotating platform. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "horizontal", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0036] Example

[0037] Please refer to Figure 1 The embodiment of the present invention provides a practical crane 10 for transporting materials. The retractable lifting structure 100 therein has a simple structure, can be folded and retracted when not in use, occupies a small space, is easy to operate, convenient to transport, has strong practicality, and is suitable for narrow spaces. The practical crane 10 includes a vehicle body 200, a rotating table 300, and a retractable lifting structure 100. The rotating table 300 is mounted on the vehicle body 200 and can rotate relative to the vehicle body 200. The retractable lifting structure 100 is mounted on the rotating table 300, and the rotating table 300 can drive the retractable lifting structure 100 to rotate relative to the vehicle body 200, thereby performing lifting operations on materials in different directions.

[0038] In this embodiment, the vehicle body 200 is used to transport the rotating table 300 and the retractable lifting structure 100. Since the retractable lifting structure 100 can be folded and shrunk when not in use and occupies little space, the vehicle body 200 is small in size and can be adapted to a small space.

[0039] Please refer to Figure 2 and Figure 3 The retractable lifting structure 100 includes a base 110, a lifting arm 120, a screw mechanism 130, a telescopic arm 140, an extension arm 150 and a hydraulic support arm 160. The base 110 is fixedly mounted on a rotating table 300, and the rotating table 300 can drive the base 110 to rotate, thereby changing the direction of the lifting operation. The base 110 is hinged to the lifting arm 120, and the end of the lifting arm 120 away from the base 110 can be raised upward to lift the material. A first cavity 170 is provided in the lifting arm 120, and the screw mechanism 130 is installed in the first cavity 170. The telescopic arm 140 is connected to the lifting arm 120 through the screw mechanism 130, and the telescopic arm 140 can extend or retract into the first cavity 170. One end of the telescopic arm 140 away from the boom 120 is hinged to the extension arm 150, and a second cavity 180 is provided in the telescopic arm 140. The extension arm 150 can rotate relative to the telescopic arm 140 and retract into the second cavity 180. One end of the hydraulic support arm 160 is fixedly connected to the base 110, and the other end is hinged to the boom 120 to support the boom 120, so that the lifting operation is safe and stable.

[0040] Please refer to Figure 4 The screw mechanism 130 includes a driving motor 131, a screw body 132 and a ball sleeve 133. The driving motor 131 is fixedly installed in the first cavity 170 and connected to the screw body 132 to drive the screw body 132 to rotate. The ball sleeve 133 is sleeved outside the screw body 132 and is threadedly connected to the screw body 132. When the driving motor 131 is started, the ball sleeve 133 rotates relative to the screw body 132, the position of the screw body 132 remains unchanged, and the ball sleeve 133 is displaced along the axial direction of the screw body 132. The ball sleeve 133 is fixedly connected to the telescopic arm 140 to drive the telescopic arm 140 to displace along the axial direction of the screw body 132, so that the telescopic arm 140 extends or retracts into the first cavity 170.

[0041] Please refer to Figure 5 The ball sleeve 133 includes a sleeve portion 134 and a ball body 135. The sleeve portion 134 is provided with a thread that matches the screw body 132, and the ball body 135 is installed between the sleeve portion 134 and the screw body 132 to reduce the friction between the sleeve portion 134 and the screw body 132. The outer wall of the sleeve portion 134 is fixedly connected to the telescopic arm 140 to drive the telescopic arm 140 to move.

[0042] Please continue to refer to Figure 3It should be noted that there are two lead screw mechanisms 130, which are relatively arranged on both sides of the telescopic arm 140. The two lead screw mechanisms 130 move synchronously to drive the telescopic arm 140 to move at the same time, and the force is balanced, so that the movement of the telescopic arm 140 is stable and reliable.

[0043] In this embodiment, a slide rail 121 is provided in the boom 120, and the slide rail 121 extends along the length direction of the boom 120. The telescopic arm 140 is provided with a slider 141, and the slider 141 cooperates with the slide rail 121 to reduce the friction force when the telescopic arm 140 moves relative to the boom 120, and the slider 141 and the slide rail 121 can support the telescopic arm 140, reduce the load of the lead screw body 132, and prevent the lead screw body 132 from deforming. Specifically, the number of the slide rail 121 and the slider 141 is two, one slide rail 121 and one slider 141 are provided on one side of the telescopic arm 140, and the other slide rail 121 and the other slider 141 are provided on the other side of the telescopic arm 140, so as to balance the force.

[0044] It is worth noting that the telescopic arm 140 is U-shaped, and the telescopic arm 140 includes a first side wall 142, a bottom wall 143, and a second side wall 144. One side of the bottom wall 143 is connected to the first side wall 142, and the other side is connected to the second side wall 144. The first side wall 142, the bottom wall 143, and the second side wall 144 are combined to form a second cavity 180. The bottom wall 143 is hinged to the extension arm 150 so that the extension arm 150 can rotate relative to the bottom wall 143. In this embodiment, the two ball sleeves 133 are fixedly mounted on the bottom of the bottom wall 143 and are relatively arranged at the two ends of the bottom wall 143. One slider 141 is arranged in the middle of the first side wall 142, and the other slider 141 is arranged in the middle of the second side wall 144.

[0045] Please refer to Figure 6 In this embodiment, the bottom wall 143 includes a bottom wall body 145 and a hinge seat 146. One end of the bottom wall body 145 is connected to the hinge seat 146, and the other end is connected to the ball sleeve 133 of the screw mechanism 130. The bottom wall body 145 can move under the drive of the screw mechanism 130, thereby extending or retracting the first cavity 170. The hinge seat 146 is hinged to the extension arm 150, so that the extension arm 150 can rotate into the second cavity 180.

[0046] The articulated seat 146 includes a first mounting platform 1461, a second mounting platform 1462 and a rotating shaft 1463. The first mounting platform 1461 and the second mounting platform 1462 are arranged opposite to each other and are both fixedly connected to the bottom wall body 145. One end of the rotating shaft 1463 is fixedly connected to the first mounting platform 1461, and the other end is fixedly connected to the second mounting platform 1462. The extension arm 150 is sleeved outside the rotating shaft 1463 and is rotatably connected to the rotating shaft 1463, so that the extension arm 150 can rotate relative to the articulated seat 146.

[0047] It should be noted that the extension arm 150 includes an arm body 151 and a hook 152. One end of the arm body 151 is hinged to the telescopic arm 140, and the other end is hinged to the hook 152. When performing a lifting operation, the extension arm 150 naturally droops under the action of gravity, and the arm body 151 pulls up the hook 152, and the hook 152 is used to hang materials.

[0048] Please refer to Figure 7 The hydraulic support arm 160 includes a support column 161, a receiving sleeve 162 and a hydraulic component 163. The support column 161 is connected to the receiving sleeve 162 through the hydraulic component 163. The support column 161 is disposed in the receiving sleeve 162 and can extend or retract into the receiving sleeve 162. One end of the support column 161 away from the receiving sleeve 162 is hinged to the boom 120, and the receiving sleeve 162 is fixedly connected to the base 110. The support column 161 can support the boom 120.

[0049] When lifting operations are not required, the extension arm 150 is first rotated relative to the telescopic arm 140 so that the extension arm 150 is completely immersed in the second cavity 180, and then the screw mechanism 130 is used to drive the telescopic arm 140 to retract into the first cavity 170. At this time, the telescopic arm 140 drives the extension arm 150 to enter the first cavity 170 together until the telescopic arm 140 is completely immersed in the first cavity 170. Finally, the lifting arm 120 is rotated relative to the base 110. At this time, the support column 161 is retracted into the accommodating sleeve 162, so that the end of the lifting arm 120 away from the base 110 is close to the base 110, and the contraction is completed.

[0050] When lifting operations are required, the screw mechanism 130 is first used to drive the telescopic arm 140 to extend out of the first cavity 170, and then the extension arm 150 is rotated so that the extension arm 150 extends out of the second cavity 180 and rotates to a vertical direction. At this time, the arm body 151 naturally droops under the action of gravity, and the hook 152 is used to hook up the material. Then, the lifting arm 120 is rotated relative to the base 110, and the end of the lifting arm 120 away from the base 110 rises upward. During this process, the support column 161 extends out of the accommodating sleeve 162 and supports the lifting arm 120. The material rises upward under the action of the hook 152 to achieve the lifting function.

[0051] The retractable lifting structure 100 provided in the embodiment of the present invention has a first cavity 170 provided in the lifting arm 120, a screw mechanism 130 is installed in the first cavity 170, a telescopic arm 140 is connected to the lifting arm 120 through the screw mechanism 130, the telescopic arm 140 can be extended or retracted into the first cavity 170, one end of the telescopic arm 140 away from the lifting arm 120 is hinged to the extension arm 150, a second cavity 180 is provided in the telescopic arm 140, the extension arm 150 can rotate relative to the telescopic arm 140 and retract into the second cavity 180. Compared with the prior art, the retractable lifting structure 100 provided by the present invention adopts a lifting arm 120 provided with a first cavity 170 and a telescopic arm 140 provided with a second cavity 180. Therefore, when not in use, the telescopic arm 140 equipped with an extension arm 150 can be retracted into the lifting arm 120 to achieve complete folding and contraction. It occupies a small space, is easy to operate, convenient to transport, has strong practicality, and is suitable for small spaces, making the practical crane 10 safe and practical, and providing a good user experience.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A retractable lifting structure, characterized in that: The invention comprises a base, a lifting arm, a screw mechanism, a telescopic arm and an extension arm, wherein the base is hinged to the lifting arm, a first cavity is arranged in the lifting arm, the screw mechanism is installed in the first cavity, the telescopic arm is connected to the lifting arm through the screw mechanism, the telescopic arm can be extended or retracted into the first cavity, one end of the telescopic arm away from the lifting arm is hinged to the extension arm, a second cavity is arranged in the telescopic arm, the extension arm can rotate relative to the telescopic arm and retract into the second cavity; The telescopic arm is U-shaped, and comprises a first side wall, a bottom wall and a second side wall, one side of the bottom wall is connected to the first side wall, and the other side of the bottom wall is connected to the second side wall, the first side wall, the bottom wall and the second side wall are combined to form the second cavity, and the bottom wall is hinged to the extension arm; A slide rail is provided in the boom, and the slide rail extends along the length direction of the boom. The telescopic arm is provided with a slider, and the slider cooperates with the slide rail; The bottom wall comprises a bottom wall body and an articulated seat, one end of the bottom wall body is connected to the articulated seat, and the other end is connected to the lead screw mechanism, and the articulated seat is articulated to the extension arm; The hinge seat includes a first mounting platform, a second mounting platform and a rotating shaft. The first mounting platform and the second mounting platform are arranged opposite to each other and are both fixedly connected to the bottom wall body. One end of the rotating shaft is fixedly connected to the first mounting platform, and the other end is fixedly connected to the second mounting platform. The extension arm is sleeved outside the rotating shaft and is rotatably connected to the rotating shaft.

2. The retractable lifting structure according to claim 1, characterized in that: The screw mechanism includes a drive motor, a screw body and a ball sleeve. The drive motor is fixedly installed in the first cavity and connected to the screw body. The ball sleeve is sleeved outside the screw body and threadedly connected to the screw body. The ball sleeve is fixedly connected to the telescopic arm.

3. The retractable lifting structure according to claim 2, characterized in that: The ball sleeve comprises a sleeve portion and a ball body, wherein the sleeve portion is provided with a thread matched with the screw body, the ball body is installed between the sleeve portion and the screw body, and the outer side wall of the sleeve portion is fixedly connected to the telescopic arm.

4. The retractable lifting structure according to claim 1, characterized in that: The number of the lead screw mechanisms is two, and the two lead screw mechanisms are arranged oppositely on two sides of the telescopic arm.

5. The retractable lifting structure according to claim 1, characterized in that: The extension arm comprises an arm body and a hook, one end of the arm body is hinged to the telescopic arm, and the other end of the arm body is hinged to the hook.

6. The retractable lifting structure according to claim 1, characterized in that: The retractable lifting structure also includes a hydraulic support arm, which includes a support column, an accommodating sleeve and a hydraulic component. The support column is connected to the accommodating sleeve via the hydraulic component. The support column is arranged in the accommodating sleeve and can extend or retract into the accommodating sleeve. One end of the support column away from the accommodating sleeve is hinged to the lifting arm, and the accommodating sleeve is fixedly connected to the base.

7. A practical crane, characterized in that: It comprises a vehicle body, a rotating platform and a retractable lifting structure as claimed in any one of claims 1 to 6, wherein the rotating platform is mounted on the vehicle body and can rotate relative to the vehicle body, and the base is fixedly mounted on the rotating platform.

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