Engineering machinery maintenance lifting crane

Abstract

The invention discloses an engineering machinery maintenance hoisting crane, which belongs to the technical field of cranes, and comprises a mounting unit, a crane body, a hydraulic cylinder body arranged at the rear part of the upper end of the crane body, an adjusting assembly arranged in the hydraulic cylinder body, and a hoisting assembly arranged on the adjusting assembly; and the control unit comprises a control assembly arranged below the hoisting assembly. According to the lifting crane for engineering machinery maintenance, the ejector rod extends outwards to be in contact with one side of the lifting rope, and an acting force for outward movement is applied, so that the lifting rope is bent, and the height of one hanging point is different from that of other hanging points, so that the effect of forming a required inclined posture after machinery is lifted is achieved; the relative position of the ejector rod in the lower pressing disc is controlled by controlling the rotating rod, and then whether the extrusion block can make contact with the ejector rod or not is controlled, so that the effect that the ejector rod at the designated position exerts acting force on the lifting rope, and the lifted mechanical part forms the needed posture is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of cranes, and in particular to a crane for repairing and hoisting engineering machinery. Background Art

[0002] The existing crane maintenance hoisting crane includes two vertical slides on the frame, and the lifting mechanism and the connecting seat are slidably connected to the corresponding slides respectively. The lifting mechanism and the connecting seat are connected by two connecting plates to ensure the connection strength between the two. The connecting seat is rotated to connect the cantilever, and the lifting mechanism drives the connecting seat to drive the cantilever to move vertically, so that the cantilever can be used in areas with obstructions above, thereby expanding the use range of the crane.

[0003] However, existing cranes can only simply lift components during use. When the location that needs to be repaired requires a tilted state to be exposed, workers are required to adopt a tilted posture to enter and perform repairs, which makes it difficult for workers to maintain their body posture for a long time and reduces the efficiency of maintenance, resulting in a decrease in overall maintenance efficiency. Summary of the Invention

[0004] In view of the above problems existing in the existing engineering machinery maintenance and lifting crane, the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to provide a construction machinery maintenance lifting crane, which aims to solve the technical problem in the prior art that components can only be simply lifted but the tilting posture of the lifted components cannot be changed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising:

[0007] The mounting unit includes a crane body, a hydraulic cylinder disposed at the rear upper end of the crane body, an adjustment assembly disposed inside the hydraulic cylinder, and a lifting assembly disposed on the adjustment assembly;

[0008] The control unit includes a control component arranged under the lifting component.

[0009] As a preferred solution of the engineering machinery maintenance and lifting crane described in the present invention, the adjustment component includes a telescopic arm arranged inside the upper end of the hydraulic cylinder body, a rope controller arranged at the lower part of the telescopic arm, and a pulley arranged on the rope controller.

[0010] As a preferred solution of the engineering machinery maintenance and lifting crane described in the present invention, a lifting rope is wound around the outside of the sheave, and six groups of lifting ropes are arranged on the outside of the sheave. The lower ends of the lifting ropes extend outward from the edge of the lifting rope controller and extend downward.

[0011] As a preferred embodiment of the engineering machinery maintenance and lifting crane of the present invention, the lifting assembly includes a hook provided at the lower end of the lifting rope, a mandrel provided on the outer side of the lower end of the lifting rope controller, and a tightening roller provided on the mandrel near one end of the lifting rope;

[0012] The pressing roller is arranged with an arc-shaped concave middle end.

[0013] As a preferred embodiment of the engineering machinery maintenance and lifting crane of the present invention, the mandrel is arranged horizontally, one end of the mandrel extends into the interior of the lifting rope controller, and the other end corresponds to the lifting rope;

[0014] An oil guide channel is provided inside the push rod, and a lubricating oil chamber is provided inside the rope controller corresponding to the upper end of the push rod. The lubricating oil chamber is connected to the oil guide channel through a pipeline, and one end of the oil guide channel extends to the outside of the tightening roller. A lower pressure plate is installed in the middle of the lower end of the rope controller, and a lower pressure telescopic rod is installed in the middle of the upper end of the lower pressure plate. An extrusion block is installed at the lower end edge of the lower pressure plate, one end of the extrusion block extends outward, and the lower side is inclined, and one end of the push rod extends to the lower end of the extrusion block and is arranged in an inclined surface.

[0015] As a preferred solution of the engineering machinery maintenance and lifting crane described in the present invention, the control component includes a control lever arranged at a section of the extrusion block close to the middle of the lower pressure plate, and a drive motor arranged at a section corresponding to the control lever and the inside of the lower pressure plate.

[0016] As a preferred solution of the engineering machinery maintenance and lifting crane described in the present invention, the control rotating rod is threadedly connected to the inside of the extrusion block, and the end of the control rotating rod away from the extrusion block penetrates into the inside of the lower pressure plate, and a motor control microcontroller is provided in the middle of the lower pressure plate.

[0017] As a preferred embodiment of the engineering machinery maintenance and lifting crane of the present invention, a first locking block and a second locking block are installed inside the rope controller corresponding to the outer side of the rope, the first locking block and the second locking block are respectively arranged on the left and right sides of the rope, and an electric pusher is installed on the side of the first locking block and the second locking block away from the rope;

[0018] A first sliding groove is provided in the lower part of the corresponding push rod inside the rope controller, and a first limiting block is provided at the lower end of the push rod to enter the first sliding groove;

[0019] A limit column is provided inside the rope controller at a position corresponding to the lower pressure plate, and the limit column passes through the inside of the rope controller.

[0020] As a preferred solution of the engineering machinery maintenance and lifting crane described in the present invention, an elastic layer is installed on the outer side of the tightening roller, the elastic layer is made of rubber, and an inclined groove is provided on the outer side.

[0021] As an optimal solution for the engineering machinery maintenance and lifting crane described in the present invention, a second limit block is installed on the upper side of the extrusion block, and a second slide groove is provided at the upper end of the extrusion block corresponding to the inside of the rope controller, and the second limit block enters the inside of the second slide groove.

[0022] Beneficial effects of the present invention:

[0023] 1. A mandrel is installed on the outer side of the lower end of the rope controller. The mandrel is arranged horizontally. One end of the mandrel extends into the rope controller, and the other end corresponds to the rope. There are six mandrels for the number of ropes. After the hook is connected to the hanging point on the machine and hoisted upward, it can extend outward through the mandrel to contact one side of the rope and apply an outward force to bend the rope, so that the height of one hanging point is different from that of the other hanging points, thereby achieving the effect of forming the desired tilt posture after the machine is lifted.

[0024] 2. A tightening roller is installed at one end of the push rod near the lifting rope, and the tightening roller is set with an arc-shaped concave setting at the middle end, and the outer side of the tightening roller fits the outer side of the lifting rope, and an elastic layer is installed on the outer side of the tightening roller. The elastic layer is made of rubber and has an inclined groove on the outer side. An oil guide channel is provided inside the push rod, and a lubricating oil chamber is provided at the upper end of the lifting rod corresponding to the lifting rod inside the lifting rope controller. The lubricating oil chamber is connected to the oil guide channel through a pipeline, and one end of the oil guide channel extends to the outside of the tightening roller. When the push rod moves toward the lifting rope, the tightening roller can contact the outside of the lifting rope, and the contact area with the lifting rope can be increased through the arc surface. At the same time, the tightening roller can roll when the lifting rope is pushed out, thereby reducing the wear on the lifting rope. Among them, by providing the elastic layer, one end of the oil guide channel can be closed, and only when the tightening roller rotates, the lubricating oil in the oil guide channel can adhere to the outer side of the elastic layer and move outward, and finally adhere to the lifting rope for lubrication, thereby further reducing the damage caused by friction.

[0025] 3. A lower pressure plate is installed in the middle of the lower end of the rope controller, and a lower pressure telescopic rod is installed in the middle of the upper end of the lower pressure plate. A limit column is set inside the rope controller corresponding to the position of the lower pressure plate. The limit column runs through the inside of the rope controller, and an extrusion block is installed at the edge of the lower end of the lower pressure plate. One end of the extrusion block extends outward, and the lower side is inclined. One end of the push rod extends to the lower end of the extrusion block and is arranged in an inclined shape. There are six extrusion blocks equidistantly arranged on the circumference of the lower pressure plate. When the telescopic rod applies a downward force to the lower pressure plate, the extrusion block can be brought into contact with the inclined surface of one end of the push rod, thereby driving the push rod to move outward and contact the rope, wherein the extrusion block is toward the middle of the lower pressure plate. A control rotating rod is installed at one end, and a thread is provided on the outside of the control rotating rod, which is engaged with the internal thread of the extrusion block. The other end of the control rotating rod penetrates into the lower pressure plate, and a driving motor is installed at the corresponding end of the control rotating rod inside the lower pressure plate. A motor control single-chip microcomputer is provided in the middle of the lower pressure plate. The motor control single-chip microcomputer can be connected to the motor control single-chip microcomputer through an external controller to control different driving motors to rotate at different times, so as to use the control rotating rod to control the relative position of the push rod in the lower pressure plate, and then control whether the extrusion block can contact the push rod, so as to achieve the effect of allowing the push rod at the specified position to exert force on the lifting rope, so that the lifted mechanical parts form the required posture. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort. Among them:

[0027] Figure 1 It is a schematic diagram of the overall structure of the engineering machinery maintenance and lifting crane of the present invention.

[0028] Figure 2 The present invention is a schematic cross-sectional view of a lifting rope controller for a crane used for maintenance of engineering machinery.

[0029] Figure 3 for Figure 2 Enlarged schematic diagram of point A in the middle.

[0030] Figure 4 for Figure 2 Enlarged schematic diagram of point B in the middle.

[0031] Figure 5 The present invention is a schematic diagram of a top perspective structure of a lifting rope controller for a crane for maintenance and lifting of engineering machinery.

[0032] Figure 6 The present invention is a schematic diagram of the perspective structure of the lower pressure plate of the engineering machinery maintenance and lifting crane from above.

[0033] Figure 7 It is a schematic diagram of the structure of the tightening roller of the engineering machinery maintenance and lifting crane of the present invention. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it constitute a separate or selective embodiment that is mutually exclusive with other embodiments.

[0037] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing the embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0038] Example 1

[0039] Reference Figure 1-6 , which is a first embodiment of the present invention, provides a crane for maintenance and lifting of construction machinery, the device comprising an installation unit 100, including a crane body 1, a hydraulic cylinder body 2 disposed at the upper rear portion of the crane body 1, an adjustment assembly 101 disposed within the hydraulic cylinder body 2, and a lifting assembly 102 disposed on the adjustment assembly 101;

[0040] The control unit 200 includes a control component 201 disposed under the lifting component 102, which facilitates the operator to control the crane to lift, move or adjust, thereby improving work efficiency.

[0041] Among them, the adjustment component 101 includes a telescopic arm 3 arranged inside the upper end of the hydraulic cylinder body 2, a rope controller 4 arranged at the lower part of the telescopic arm 3, and a pulley 8 arranged on the rope controller 4. Through the telescopic arm 3 and the rope controller 4, the tilt posture of the lifting component can be adjusted, which makes it easier for maintenance personnel to access the parts that need maintenance, while ensuring the accuracy and safety of the operation and reducing the work intensity of the maintenance personnel.

[0042] During use, ensure that the crane body 1 is placed stably and fixedly on the ground, start the hydraulic cylinder 2, so that the telescopic arm 3 can be smoothly extended or retracted, and connect the lifting rope 5 to the engineering machinery component that needs to be lifted through the pulley 8 on the lifting rope controller 4. The staff controls the retraction and extension of the lifting rope 5 through the lifting rope controller 4, lifts the engineering machinery component to an appropriate height, and then carries out maintenance work.

[0043] Example 2

[0044] Reference Figure 1-7 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: a lifting rope 5 is wound around the outside of the rope pulley 8, and a total of six groups of lifting ropes 5 are arranged on the outside of the rope pulley 8. The lower ends of the lifting ropes 5 extend outward from the edge of the lifting rope controller 4 and extend downward. The design of multiple groups of lifting ropes 5 allows multiple components to be lifted or moved at the same time, which can reduce the number of movements of the crane and improve work efficiency. At the same time, the staff can adjust the distribution of lifting points to adapt to maintenance objects of different shapes and sizes, and multiple groups of lifting ropes 5 help to distribute the load more evenly, reduce the load tilting or swinging caused by uneven distribution of lifting points, and improve the stability of the lifting process. The lifting ropes 5 extend outward from the edge of the lifting rope controller 4, which can reduce the friction between the lifting ropes 5 and the inside of the controller, extend the service life of the lifting ropes 5, and facilitate the operator to quickly and accurately control the lifting ropes 5, thereby improving the convenience of operation.

[0045] Compared with Example 1, the lifting assembly 102 further includes a hook 6 provided at the lower end of the lifting rope 5, a push rod 7 provided on the outer side of the lower end of the lifting rope controller 4, and a tightening roller 12 provided on the push rod 7 near one end of the lifting rope 5. The configuration of the push rod 7 and the tightening roller 12 simplifies the adjustment and adjustment process of the lifting rope 5, making the operation easier and faster.

[0046] The tightening roller 12 is set with an arc-shaped inward concave setting at the middle end, which can fit tightly with the rope 5, reducing the hard friction when the rope 5 contacts the top rod 7, thereby reducing wear. The arc-shaped inward concave shape can evenly distribute pressure when the rope 5 is under force, which helps to maintain stability when the rope 5 is under force, reduce the swing of the rope 5, and improve the stability and safety of the lifting operation.

[0047] Compared with Example 1, the mandrel 7 is further arranged horizontally, with one end of the mandrel 7 extending into the interior of the rope controller 4 and the other end corresponding to the rope 5, which helps to evenly distribute the tension of the rope 5 and reduce the mutual interference between the ropes 5, thereby improving the stability and safety of the lifting process. The corresponding relationship between the position of the mandrel 7 and the rope 5 allows the staff to accurately control the retraction and extension of the rope 5, making the positioning of the load more accurate;

[0048] An oil guide channel 13 is provided inside the push rod 7, and a lubricating oil chamber 11 is provided inside the rope controller 4 corresponding to the upper end of the push rod 7. The lubricating oil chamber 11 is connected to the oil guide channel 13 through a pipeline. One end of the oil guide channel 13 extends to the outside of the pressing roller 12, so that the lubricating oil is guided to the outside of the pressing roller 12, reducing the friction and wear between the roller and the rope 5, thereby reducing the safety hazards caused by friction overheating, maintaining the stable operation of the system, and improving the safety of operation. A downward pressure device is installed in the middle of the lower end of the rope controller 4. The disc 14 has a downward telescopic rod 19 installed in the middle of the upper end of the lower pressure plate 14, and an extrusion block 15 is installed at the edge of the lower end of the lower pressure plate 14. One end of the extrusion block 15 extends outward, and the lower side is inclined. When the tension or position of the suspension rope 5 needs to be adjusted, precise control can be achieved by pressing the telescopic rod 19 downward. One end of the push rod 7 extends to the lower end of the extrusion block 15 and is arranged in an inclined shape. The inclined setting of the extrusion block 15 can reduce local stress concentration, protect the suspension rope 5 from excessive tensile force, and reduce the risk of breakage.

[0049] The remaining structures are the same as those of Example 1.

[0050] Example 3

[0051] Reference Figure 1-7 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: the control component 201 includes a control rod 16 arranged at a section of the extrusion block 15 near the middle of the lower pressure plate 14, and a drive motor 18 arranged at a section corresponding to the control rod 16 and the inside of the lower pressure plate 14. Through the cooperation of the control rod 16 and the drive motor 18, the extrusion block 15 can be accurately controlled, and then the position of the push rod 7 can be accurately adjusted, thereby improving the control accuracy of the tension of the suspension rope 5, which not only reduces the workload of manual operation but also improves safety performance.

[0052] Compared with Example 2, further, the control rod 16 is threadedly connected to the inside of the extrusion block 15, and the end of the control rod 16 away from the extrusion block 15 penetrates into the lower pressure plate 14. A motor control microcontroller is provided in the middle of the lower pressure plate 14 to facilitate precise control of the operation of the drive motor 18.

[0053] Compared with Example 2, further, a first locking block 9 and a second locking block 10 are installed inside the rope controller 4 corresponding to the outer side of the rope 5, so as to prevent the rope 5 from sliding or falling off during operation, thereby improving the stability and safety of the device. The first locking block 9 and the second locking block 10 are respectively arranged on the left and right sides of the rope 5. An electric pusher is installed on the side of the first locking block 9 and the second locking block 10 away from the rope 5, so that the staff can remotely or automatically control the locking and releasing of the first locking block 9 and the second locking block 10, thereby reducing labor costs.

[0054] A first chute 401 is provided inside the rope controller 4 at the lower portion of the mandrel 7, and a first limit block 701 is provided at the lower end of the mandrel 7 to enter the first chute 401, effectively reducing direct friction between the mandrel 7 and the internal structure of the rope controller 4, thereby reducing wear and tear, extending the service life of the mandrel 7 and the rope controller 4, dispersing the load borne by the mandrel 7, and reducing stress concentration.

[0055] A limit column 17 is set inside the rope controller 4 at the position corresponding to the lower pressure plate 14, which effectively prevents the lower pressure plate 14 from excessive movement or accidental sliding out, thereby improving the safety of operation. The limit column 17 runs through the rope controller 4. When the position set by the limit column 17 is reached, the lower pressure plate 14 will automatically stop moving, effectively preventing misoperation or manual error from causing the lower pressure plate 14 to exceed the safety range.

[0056] Compared with Example 2, further, an elastic layer 1201 is installed on the outside of the pressing roller 12, which can reduce the hard friction between the pressing roller 12 and the rope 5, thereby reducing wear, protecting the rope 5 from damage, and extending the service life of the rope 5. The elastic layer 1201 is made of rubber and has an inclined groove on the outside, so that the elastic layer 1201 can better adapt to the shape change of the rope 5, making the contact between the elastic layer 1201 and the rope 5 more stable, reducing the swing of the rope 5 when under force, and improving the smoothness of the operation. The installation and replacement of rubber are relatively simple, which can reduce maintenance time and cost.

[0057] Compared with Example 2, further, a second limit block 1501 is installed on the upper side of the extrusion block 15, which can prevent the extrusion block 15 from excessive movement or accidentally sliding out of the slide during operation. A second slide 1401 is provided at the upper end of the extrusion block 15 corresponding to the inside of the rope controller 4, and the second limit block 1501 enters the inside of the second slide 1401. The design of the second limit block 1501 and the second slide 1401 makes the movement of the extrusion block 15 inside the rope controller 4 more precise and controllable, thereby improving the stability of the device.

[0058] The remaining structures are the same as those of Example 2.

[0059] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape, and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, changes in orientation, etc.) without departing substantially from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature, number, or position of the discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structures. Other replacements, improvements, changes, and omissions may be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0060] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A crane for hoisting and repairing construction machinery, characterized in that: include, The mounting unit (100) comprises a crane body (1), a hydraulic cylinder body (2) arranged at the rear upper end of the crane body (1), an adjustment component (101) arranged inside the hydraulic cylinder body (2), and a lifting component (102) arranged on the adjustment component (101); The control unit (200) comprises a control component (201) arranged under the lifting component (102).

2. The construction machinery maintenance and lifting crane according to claim 1, characterized in that: The adjustment component (101) comprises a telescopic arm (3) arranged inside the upper end of the hydraulic cylinder body (2), a rope controller (4) arranged at the lower part of the telescopic arm (3), and a rope wheel (8) arranged on the rope controller (4).

3. The construction machinery maintenance and lifting crane according to claim 2, characterized in that: A suspension rope (5) is wound around the outside of the rope wheel (8), and a total of six groups of suspension ropes (5) are arranged outside the rope wheel (8). The lower ends of the suspension ropes (5) extend outward from the edge of the suspension rope controller (4) and extend downward.

4. The construction machinery maintenance and lifting crane according to claim 3, characterized in that: The lifting assembly (102) comprises a hook (6) arranged at the lower end of the lifting rope (5), a push rod (7) arranged on the outer side of the lower end of the lifting rope controller (4), and a tightening roller (12) arranged on the push rod (7) close to one end of the lifting rope (5); The pressing roller (12) is arranged with an arc-shaped inward concave middle end.

5. The construction machinery maintenance and lifting crane according to claim 4, characterized in that: The push rod (7) is arranged transversely, one end of the push rod (7) extends into the interior of the suspension rope controller (4), and the other end of the push rod (7) corresponds to the suspension rope (5); An oil guide channel (13) is arranged inside the push rod (7), and a lubricating oil chamber (11) is arranged inside the rope controller (4) corresponding to the upper end of the push rod (7). The lubricating oil chamber (11) is connected to the oil guide channel (13) through a pipeline, and one end of the oil guide channel (13) extends to the outside of the pressing roller (12). A lower pressure plate (14) is installed in the middle of the lower end of the rope controller (4), and a lower pressure telescopic rod (19) is installed in the middle of the upper end of the lower pressure plate (14). An extrusion block (15) is installed at the lower edge of the lower pressure plate (14), and one end of the extrusion block (15) extends outward, and the lower side is inclined. One end of the push rod (7) extends to the lower end of the extrusion block (15) and is arranged in an inclined surface.

6. The construction machinery maintenance and lifting crane according to claim 5, characterized in that: The control assembly (201) comprises a control lever (16) arranged at a section of the extrusion block (15) close to the middle of the lower pressure plate (14), and a drive motor (18) arranged at a section corresponding to the control lever (16) and the inside of the lower pressure plate (14).

7. The construction machinery maintenance and lifting crane according to claim 6, characterized in that: The control rotating rod (16) is threadedly connected to the inside of the extrusion block (15), and one end of the control rotating rod (16) away from the extrusion block (15) penetrates into the inside of the lower pressure plate (14), and a motor control single chip microcomputer is provided in the middle of the lower pressure plate (14).

8. The construction machinery maintenance and lifting crane according to claim 7, characterized in that: A first locking block (9) and a second locking block (10) are installed inside the rope controller (4) corresponding to the outer side of the rope (5), the first locking block (9) and the second locking block (10) are respectively arranged on the left and right sides of the rope (5), and an electric pusher is installed on the side of the first locking block (9) and the second locking block (10) away from the rope (5); A first sliding groove (401) is provided inside the rope controller (4) corresponding to the lower part of the push rod (7), and a first limiting block (701) entering the first sliding groove (401) is provided at the lower end of the push rod (7); A limit column (17) is arranged inside the rope controller (4) at a position corresponding to the lower pressure plate (14), and the limit column (17) passes through the rope controller (4).

9. The construction machinery maintenance and lifting crane according to claim 8, characterized in that: An elastic layer (1201) is installed on the outer side of the pressing roller (12); the elastic layer (1201) is made of rubber material and has an inclined groove on the outer side.

10. The construction machinery maintenance and lifting crane according to claim 9, characterized in that: A second limiting block (1501) is installed on the upper side of the extrusion block (15), and a second sliding groove (1401) is arranged inside the rope controller (4) corresponding to the upper end of the extrusion block (15), and the second limiting block (1501) enters the second sliding groove (1401).

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