Ground driving end display screen adjusting device for unmanned tower crane

By designing a ground driving terminal display adjustment device for unmanned tower cranes, the problem of easy damage to the display screen during transportation is solved, convenient storage and protection of the display screen is achieved, and the driver's operation convenience is improved.

CN120097228AInactive Publication Date: 2025-06-06CHINA CONSTR FIRST BUREAU GRP SOUTHEAST CONSTR CO LTD +3
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Patent Information

Application Number
CN202510604306.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-12
Publication Date
2025-06-06
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The ground driving equipment with unmanned tower cranes has many display screens and is inconvenient for transportation, and is prone to collision and damage during the transfer process.

Method used

Design a floor driving end display adjustment device for unmanned tower cranes, including cabinets, support frames and display screens. The movable frame is folded by the storage mechanism, and the side fixing frame is angled by the angle adjustment mechanism, and the support frame is stored in the storage slot through the lifting mechanism to protect the display screen.

Benefits of technology

It realizes convenient storage and protection of the display screen, simplifies the transportation process of the equipment, avoids the problem of damage caused by collision during transportation, and provides a more flexible observation angle, improving the driver's operation convenience.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a ground driving end display screen adjusting device for an unmanned tower crane, the ground driving end display screen adjusting device comprises a cabinet, a support frame and a display screen, a middle fixing frame and two side fixing frames for fixing the display screen are arranged in the support frame, and the two side fixing frames are controlled by an angle adjusting mechanism to adjust the inclination angle. The two sides of the supporting frame are each provided with a movable frame, the two side fixing frames are installed on the two movable frames respectively, and the two movable frames are controlled by the storage mechanism to move from the two sides of the middle fixing frame to the middle of the middle fixing frame so that the two movable frames can be folded on the rear side of the middle fixing frame. The display screen on the side can be stored through driving of the storage mechanism, and then the supporting frame can be driven to descend through the lifting mechanism, so that the display screen is stored in the storage groove, equipment transportation is facilitated, and the display screen is protected; and the angle of the display screen can be adjusted through the angle adjusting mechanism, so that a driver can observe a display picture more clearly.
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Description

Technical Field

[0001] The present invention relates to the technical field of unmanned tower cranes, and in particular to a display screen adjustment device for a ground driving end of an unmanned tower crane. Background Art

[0002] The ground driving of unmanned tower cranes is usually carried out in a special underground cockpit. The cockpit is equipped with various control devices and display screens. Operators can operate and monitor the tower crane through these devices. The display screen is used to display the operating status, working parameters, monitoring images and other information of the tower crane to help operators understand the real-time situation of the tower crane. The ground driving of unmanned tower cranes enables operators to operate on the ground, avoiding the risks of high-altitude operations. At the same time, the automation and intelligent functions of the tower crane also reduce safety accidents caused by human factors. Unmanned tower cranes can work 24 hours a day, and the operation is more precise and efficient, which can speed up the construction progress and quality. Operators do not need to work for a long time in the high-altitude cab. The working environment is more comfortable and the labor intensity is greatly reduced. Through the centralized control system, multiple tower cranes can be uniformly managed and monitored, equipment failures can be discovered and resolved in time, and the service life and operating efficiency of the equipment can be improved.

[0003] Since construction sites are temporary, tower cranes need to be moved to another site after on-site construction is completed. Therefore, ground unmanned driving equipment used with tower cranes needs to be frequently moved. However, there are many display screens on ground unmanned driving equipment, which makes transportation inconvenient. During the transfer process, the display screens are also prone to collision and damage. Therefore, we propose a display screen adjustment device for the ground driving end of an unmanned tower crane. Summary of the invention

[0004] The object of the present invention is to provide a display screen adjustment device for the ground driving end of an unmanned tower crane to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a display screen adjustment device for the ground driving end of an unmanned tower crane, comprising a cabinet, a support frame and a display screen, wherein a central fixing frame and two side fixing frames for fixing the display screen are arranged inside the support frame, wherein the central fixing frame is located in the middle of the support frame, and the two side fixing frames are respectively located on both sides of the central fixing frame; The two side fixing frames are controlled by an angle adjustment mechanism to adjust the tilt angle; Both sides of the support frame are provided with slide grooves, and the slide grooves are formed by connecting a transverse slide groove and an inclined slide groove, two movable frames are slidably connected in the two slide grooves, and the two side fixed frames are respectively installed on the two movable frames; The two movable racks are controlled by the storage mechanism to move from the two sides of the middle fixed rack to the middle, so that the two movable racks are folded at the rear side of the middle fixed rack; A storage slot is provided at the upper end of the cabinet near the rear side, and a lifting mechanism is provided at the bottom of the storage slot. The support frame is driven by the lifting mechanism to be stored from the upper end of the cabinet to the inside of the storage slot.

[0006] Preferably, the support frame comprises an upper support plate and a lower support plate, the upper support plate and the lower support plate are fixedly connected via a supporting square tube, the upper support plate is provided with an upper slide groove penetrating through the upper support plate, and the lower support plate is provided with a lower slide groove at the upper end.

[0007] Preferably, the movable frame includes an upper movable plate and a lower movable plate, and the upper movable plate and the lower movable plate are fixedly connected by a fixed shaft. An upper guide column is provided at the upper end of the upper movable plate, and the upper end of the upper guide column passes through an upper slide groove and is slidably connected to the upper slide groove. A lower guide column is provided at the lower end of the lower movable plate, and the lower end of the lower guide column is located inside the lower slide groove and is slidably connected to the lower slide groove.

[0008] Preferably, the storage mechanism comprises a fixing frame fixed to the upper end of the upper support plate, two screw rods are rotatably mounted inside the fixing frame, and one end of the two screw rods close to the middle of the fixing frame is provided with a driven bevel gear, a motor 1 is fixedly mounted on the upper end of the fixing frame, and an active bevel gear is provided at the output end of the motor 1, and the active bevel gear is meshed and connected with the two driven bevel gears at the same time; The two screw rods are both connected with nut blocks through threads, and a fixing column 1 is provided at the lower end of the nut block. The fixing column 1 is connected to the upper guide column through a connecting plate, and the two ends of the connecting plate are rotatably connected to the fixing column 1 and the upper guide column respectively.

[0009] Preferably, the angle adjustment mechanism includes a two-way telescopic mechanism fixed to the upper end of the lower support plate, and both output ends of the two-way telescopic mechanism are provided with a fixed plate, a motor 2 is fixedly installed on one side of the fixed plate, and a rotating plate is provided at the output end of the motor 2, and the rotating plate is located close to the side fixing frame, and a fixed column 2 is provided at the lower end of the side fixing frame close to the rotating plate, and a clamping piece is movably installed on the rotating plate, and the clamping piece is controlled by the two-way telescopic mechanism to clamp or disengage the fixed column 2.

[0010] Preferably, the clamping member includes a rotating shaft and a U-shaped frame for clamping the second fixed column, one end of the rotating shaft is fixedly connected to the bottom of the U-shaped frame, and the other end of the rotating shaft is rotatably connected to the rotating plate.

[0011] Preferably, a fixing block is provided in the middle of the back side of the side fixing frame, and the fixing shaft is rotatably connected to the fixing block.

[0012] Preferably, an electromagnetic block is provided at the upper end of the lower movable plate, and a magnetic block matching the electromagnetic block is provided at the lower end of the side fixing frame, and the electromagnetic block is attracted to the magnetic block after being energized.

[0013] Preferably, two display screens are installed inside the middle fixing frame and the side fixing frame, and the two display screens are distributed up and down.

[0014] Preferably, a protective plate for protecting the display screen is provided on the back of the cabinet, and an inclined surface is provided on the upper end of the cabinet at one side of the storage slot, and a plurality of operation buttons are provided on the inclined surface.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention drives the upper guide column and the lower guide column to move through the storage mechanism, and according to the shapes of the upper slide groove and the lower slide groove, the two movable frames can be folded at the rear side of the middle fixed frame, so that the side display screens can be stored, and then the lifting mechanism can drive the support frame to descend, so that the display screen is stored in the storage groove, which is convenient for the transportation of the equipment and the protection of the display screen. The side fixing frame is driven to rotate by the angle adjustment mechanism, and the angle of the side fixing frame can be adjusted, so that the driver can observe the display screen in the side fixing frame more clearly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention when in use; Figure 2 It is a schematic diagram of the overall structure when the side fixing frame of the present invention is folded to the rear side of the middle fixing frame; Figure 3 is a side cross-sectional view of the present invention; Figure 4 The display screen of the present invention is partially schematically shown in the unfolded state. Figure 1 ; Figure 5 For the present invention Figure 4 Detailed enlarged view of point A in the middle; Figure 6 The display screen of the present invention is partially schematically shown in the unfolded state. Figure 2 ; Figure 7 It is a front view of a part of the structure of the display screen of the present invention when it is unfolded; Figure 8 It is a schematic diagram of a part of the structure after the angle of the display screen of the present invention is adjusted; Fig. 9 For the present invention Figure 8 Detailed enlarged view of point B in the middle; Fig.10 It is a schematic diagram of the overall structure of the support frame of the present invention; Fig.11 It is a schematic diagram of the overall structure of the mobile rack of the present invention.

[0017] In the figure: 1, cabinet; 11, storage slot; 12, protective plate; 13, operation button; 2, lifting mechanism; 3, support frame; 31, upper support plate; 32, lower support plate; 33, supporting square tube; 34, upper slide; 35, lower slide; 4, display screen; 5, middle fixing frame; 6, side fixing frame; 61, fixing block; 7, angle adjustment mechanism; 71, two-way telescopic mechanism; 72, fixing plate; 73, motor 2; 74, rotating plate; 75, Fixed column two; 76, clamping part; 761, rotating shaft; 762, U-shaped frame; 8, moving frame; 81, upper moving plate; 82, lower moving plate; 83, fixed shaft; 84, upper guide column; 85, lower guide column; 9, storage mechanism; 91, fixed frame; 92, screw rod; 93, driven bevel gear; 94, motor one; 95, driving bevel gear; 96, nut block; 97, fixed column one; 98, connecting plate; 10, electromagnetic block; 101, magnetic suction block. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0019] See also Figure 1-11 The present invention provides a technical solution: a display screen adjustment device for a ground driving end of an unmanned tower crane, comprising a cabinet 1, a support frame 3 and a display screen 4, a protective plate 12 for protecting the display screen 4 is provided on the back of the cabinet 1, an inclined surface is provided on the upper end of the cabinet 1 located on one side of a storage slot 11, and a plurality of operation buttons 13 are provided on the inclined surface, a middle fixing frame 5 and two side fixing frames 6 for fixing the display screen 4 are provided inside the support frame 3, two display screens 4 are installed inside the middle fixing frame 5 and the side fixing frame 6, and the two display screens 4 are distributed up and down, the middle fixing frame 5 is located in the middle of the support frame 3, and the two side fixing frames 6 are respectively located on both sides of the middle fixing frame 5; The support frame 3 includes an upper support plate 31 and a lower support plate 32, which are fixedly connected by a supporting square tube 33. The upper support plate 31 is provided with an upper slide groove 34 penetrating the upper support plate 31, and the lower support plate 32 is provided with a lower slide groove 35 at its upper end. The two side fixing frames 6 are controlled by the angle adjustment mechanism 7 to adjust the tilt angle; The angle adjustment mechanism 7 includes a two-way telescopic mechanism 71 fixed to the upper end of the lower support plate 32, and the two output ends of the two-way telescopic mechanism 71 are both provided with a fixed plate 72, and a second motor 73 is fixedly installed on one side of the fixed plate 72, and a rotating plate 74 is provided at the output end of the second motor 73, and the rotating plate 74 is located on the side close to the side fixing frame 6, and the lower end of the side fixing frame 6 close to the side of the rotating plate 74 is provided with a second fixed column 75, and a clamping member 76 is movably installed on the rotating plate 74, and the clamping member 76 is controlled by the two-way telescopic mechanism 71 to clamp or disengage the second fixed column 75; The clamping member 76 includes a rotating shaft 761 and a U-shaped frame 762 for clamping the second fixed column 75. One end of the rotating shaft 761 is fixedly connected to the bottom of the U-shaped frame 762, and the other end of the rotating shaft 761 is rotatably connected to the rotating plate 74. A fixing block 61 is provided in the middle of the back of the side fixing frame 6, and a fixing shaft 83 is rotatably connected to the fixing block 61; An electromagnetic block 10 is disposed at the upper end of the lower movable plate 82 , and a magnetic attraction block 101 matching the electromagnetic block 10 is disposed at the lower end of the side fixing frame 6 . The electromagnetic block 10 is attracted to the magnetic attraction block 101 after being energized.

[0020] The driver sits on a chair in front of the cabinet 1 to operate the tower crane. Multiple display screens 4 are used to display the operating status, working parameters, monitoring images and other information of the tower crane, so as to help the operator understand the real-time situation of the tower crane. The angle of the side fixing frame 6 can be adjusted through the angle adjustment mechanism 7, so that the driver can observe the display screen 4 in the side fixing frame 6 more clearly. When the electromagnetic block 10 is powered on, it attracts the magnetic block 101, so that the side fixing frame 6 can be fixed on the moving frame 8 to prevent the side fixing frame 6 from rotating. When the side fixing frame 6 needs to be rotated, the electromagnetic block 10 is powered off, so that the electromagnetic block 10 and the magnetic block 101 are no longer attracted to each other, so that the side fixing frame 6 can rotate, and then the two rotating plates 74 are driven by the two-way telescopic mechanism 71 to move toward the side fixing frame 6, so that the fixing column 2 75 enters the U-shaped frame 762 and the interior, as shown in FIG. Figure 4-5 Then, the motor 2 73 drives the rotating plate 74 to rotate 180 degrees. During the rotation of the rotating plate 74, the U-shaped frame 762 rotates along with the rotating plate 74 and rises and then falls along the fixed column 2 75. At the same time, the rotating shaft 761 rotates on the rotating plate 74, so that the U-shaped frame 762 pushes the fixed column 2 75 to move, so that the fixed block 61 rotates on the fixed shaft 83, so that the side fixed frame 6 rotates, and the display screen 4 installed inside the side fixed frame 6 rotates, as shown in FIG. Figure 8-9 , so that the driver sitting in the middle of the front of the cabinet 1 can clearly and conveniently observe the display screen 4.

[0021] Both sides of the support frame 3 are provided with slide grooves, and the slide grooves are connected by a transverse slide groove and an inclined slide groove. Two movable frames 8 are slidably connected in the two slide grooves, and the two side fixed frames 6 are respectively installed on the two movable frames 8; The movable frame 8 includes an upper movable plate 81 and a lower movable plate 82, which are fixedly connected by a fixed shaft 83. An upper guide column 84 is provided at the upper end of the upper movable plate 81, and the upper end of the upper guide column 84 passes through the upper slide groove 34 and is slidably connected to the upper slide groove 34. A lower guide column 85 is provided at the lower end of the lower movable plate 82, and the lower end of the lower guide column 85 is located inside the lower slide groove 35 and is slidably connected to the lower slide groove 35. The two movable frames 8 are controlled by the storage mechanism 9 to move from the two sides of the middle fixed frame 5 to the middle, so that the two movable frames 8 are folded at the rear side of the middle fixed frame 5 .

[0022] The storage mechanism 9 includes a fixing frame 91 fixed to the upper end of the upper support plate 31, and two screw rods 92 are rotatably installed on the inner side of the fixing frame 91. The ends of the two screw rods 92 close to the middle of the fixing frame 91 are provided with driven bevel gears 93, and a motor 94 is fixedly installed on the upper end of the fixing frame 91. The output end of the motor 94 is provided with an active bevel gear 95, and the active bevel gear 95 is meshed and connected with the two driven bevel gears 93 at the same time. Nut blocks 96 are threadedly connected to the two screw rods 92, and a fixing column 97 is provided at the lower end of the nut block 96. The fixing column 97 is connected to the upper guide column 84 through a connecting plate 98, and the two ends of the connecting plate 98 are rotatably connected to the fixing column 97 and the upper guide column 84 respectively.

[0023] When the unmanned driving equipment is transferred, the display screen 4 is stored by the storage mechanism 9. First, the side fixing frame 6 is made parallel to the middle fixing frame 5 through the angle adjustment mechanism 7, and then the electromagnetic block 10 is energized so that the electromagnetic block 10 and the magnetic block 101 are attracted to each other, so that the side fixing frame 6 is fixed on the moving frame 8. Then the two-way telescopic mechanism 71 drives the U-shaped frame 762 to leave the fixed column 2 75, and the motor 1 94 is started. The two screw rods 92 are rotated by the meshing connection of the active bevel gear 95 and the driven bevel gear 93, so that the two nut blocks 96 are close to the middle of the support frame 3, and the upper guide column 84 is driven by the connecting plate 98 to slide in the upper slide groove 34, and the lower guide column 85 is driven in the lower slide groove 35. According to the shapes of the upper slide groove 34 and the lower slide groove 35, the two moving frames 8 can be folded at the rear side of the middle fixing frame 5, so that the side display screen 4 can be stored. In addition, the two screw rods 92 are driven to reverse by the motor 1 94 to unfold the side fixing frame 6.

[0024] A storage slot 11 is provided at the upper end of the cabinet 1 near the rear side, and a lifting mechanism 2 is provided at the bottom of the storage slot 11 . The support frame 3 is driven by the lifting mechanism 2 to be stored from the upper end of the cabinet 1 to the inside of the storage slot 11 .

[0025] When the display screen 4 on the side is stored, the lifting mechanism 2 at the bottom of the storage slot 11 drives the support frame 3 to descend, so that the display screen 4 is stored inside the storage slot 11, which is convenient for transportation of the equipment.

[0026] The working principle and use process of the present invention are as follows: when the display screen 4 is stored, the support frame 3 is located inside the storage slot 11. When in use, the support frame 3 is driven to rise by the lifting mechanism 2, so that the display screen 4 rises above the cabinet 1. At this time, the side fixing frame 6 is located behind the middle fixing frame 5. The two side fixing frames 6 are unfolded by the storage mechanism 9, so that the moving frame 8 slides in the slide groove, so that the two side fixing frames 6 move to both sides of the middle fixing frame 5, and then the side fixing frames 6 are driven to rotate by the angle adjustment mechanism 7, so that the display screen 4 installed inside the side fixing frames 6 rotates a certain angle, so that the driver can observe the display screen 4 inside the side fixing frames 6 more clearly.

[0027] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A display screen adjustment device for a ground driving end of an unmanned tower crane, comprising a cabinet (1), a support frame (3) and a display screen (4), characterized in that: A central fixing frame (5) and two side fixing frames (6) for fixing the display screen (4) are provided inside the support frame (3), wherein the central fixing frame (5) is located in the middle of the support frame (3), and the two side fixing frames (6) are respectively located on both sides of the central fixing frame (5); The two side fixing frames (6) are controlled by an angle adjustment mechanism (7) to adjust the tilt angle; Both sides of the support frame (3) are provided with slide grooves, and the slide grooves are formed by connecting a transverse slide groove and an inclined slide groove, and two movable frames (8) are slidably connected in the two slide grooves, respectively, and the two side fixed frames (6) are respectively mounted on the two movable frames (8); The two movable frames (8) are controlled by the storage mechanism (9) to move from both sides of the middle fixed frame (5) toward the middle, so that the two movable frames (8) are folded on the rear side of the middle fixed frame (5); The upper end of the cabinet (1) is provided with a storage groove (11) near the rear side, and the bottom of the storage groove (11) is provided with a lifting mechanism (2), and the support frame (3) is driven by the lifting mechanism (2) to be stored from the upper end of the cabinet (1) into the storage groove (11).

2. The display screen adjustment device for the ground driving end of an unmanned tower crane according to claim 1 is characterized in that: The support frame (3) comprises an upper support plate (31) and a lower support plate (32), wherein the upper support plate (31) and the lower support plate (32) are fixedly connected via a supporting square tube (33), the upper support plate (31) is provided with an upper slide groove (34) penetrating the upper support plate (31), and the upper end of the lower support plate (32) is provided with a lower slide groove (35).

3. The display screen adjustment device for the ground driving end of an unmanned tower crane according to claim 2 is characterized in that: The movable frame (8) comprises an upper movable plate (81) and a lower movable plate (82), wherein the upper movable plate (81) and the lower movable plate (82) are fixedly connected via a fixed shaft (83); an upper guide column (84) is provided at the upper end of the upper movable plate (81); the upper end of the upper guide column (84) passes through the upper slide groove (34) and is slidably connected to the upper slide groove (34); a lower guide column (85) is provided at the lower end of the lower movable plate (82); the lower end of the lower guide column (85) is located inside the lower slide groove (35) and is slidably connected to the lower slide groove (35).

4. The display screen adjustment device for the ground driving end of an unmanned tower crane according to claim 3 is characterized in that: The storage mechanism (9) comprises a fixing frame (91) fixed to the upper end of the upper support plate (31), two screw rods (92) are rotatably mounted inside the fixing frame (91), and one end of the two screw rods (92) close to the middle of the fixing frame (91) is provided with a driven bevel gear (93), and a motor 1 (94) is fixedly mounted on the upper end of the fixing frame (91), and an active bevel gear (95) is provided at the output end of the motor 1 (94), and the active bevel gear (95) is meshedly connected with the two driven bevel gears (93) at the same time; The two screw rods (92) are both connected to nut blocks (96) via threads, and a fixing column (97) is provided at the lower end of the nut block (96). The fixing column (97) is connected to the upper guide column (84) via a connecting plate (98), and the two ends of the connecting plate (98) are rotatably connected to the fixing column (97) and the upper guide column (84) respectively.

5. The display screen adjustment device for the ground driving end of an unmanned tower crane according to claim 2 is characterized in that: The angle adjustment mechanism (7) comprises a bidirectional telescopic mechanism (71) fixed to the upper end of the lower support plate (32); both output ends of the bidirectional telescopic mechanism (71) are provided with a fixed plate (72); a second motor (73) is fixedly mounted on one side of the fixed plate (72); a rotating plate (74) is provided at the output end of the second motor (73); the rotating plate (74) is located on a side close to the side fixing frame (6); a second fixed column (75) is provided at the lower end of the side fixing frame (6) close to the rotating plate (74); a clamping member (76) is movably mounted on the rotating plate (74); the clamping member (76) is controlled by the bidirectional telescopic mechanism (71) to clamp or disengage the second fixed column (75).

6. The display screen adjustment device for the ground driving end of an unmanned tower crane according to claim 5, characterized in that: The clamping member (76) comprises a rotating shaft (761) and a U-shaped frame (762) for clamping the second fixed column (75); one end of the rotating shaft (761) is fixedly connected to the bottom of the U-shaped frame (762), and the other end of the rotating shaft (761) is rotatably connected to the rotating plate (74).

7. The display screen adjustment device for the ground driving end of an unmanned tower crane according to claim 3 is characterized in that: A fixing block (61) is provided in the middle of the back side of the side fixing frame (6), and the fixing shaft (83) is rotatably connected to the fixing block (61).

8. The display screen adjustment device for the ground driving end of an unmanned tower crane according to claim 3 is characterized in that: An electromagnetic block (10) is provided at the upper end of the lower movable plate (82), and a magnetic attraction block (101) matching the electromagnetic block (10) is provided at the lower end of the side fixing frame (6). When the electromagnetic block (10) is energized, it attracts the magnetic attraction block (101).

9. The display screen adjustment device for the ground driving end of an unmanned tower crane according to claim 1, characterized in that: Two display screens (4) are installed inside the middle fixing frame (5) and the side fixing frame (6), and the two display screens (4) are distributed up and down.

10. The display screen adjustment device for the ground driving end of an unmanned tower crane according to claim 1, characterized in that: The back of the cabinet (1) is provided with a protective plate (12) for protecting the display screen (4), and the upper end of the cabinet (1) is provided with an inclined surface located on one side of the storage slot (11), and a plurality of operating buttons (13) are provided on the inclined surface.

Citation Information

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