Device for monitoring safety of tower crane

Abstract

When the device for monitoring the safety of the tower crane is installed, taking one side of the tower crane as an example, the first plate body is fixed to the side face of the tower crane through the clamping assembly, the plane where the first plate body is located is parallel to the side face of the corresponding tower crane, and the perpendicularity of the first plate body is the same as the perpendicularity of the side face of the corresponding tower crane; then the second plate body rotates around the first plate body through the angle adjusting assembly and is matched with the gradienter to rotate the second plate body to the horizontal state, and at the moment, the included angle between the first plate body and the second plate body, namely the perpendicularity of the corresponding side face of the tower crane, can be directly obtained through the protractor; through the structural design, after the device for monitoring the safety of the tower crane is installed, measurement can be conducted without other operations, operation is easy and convenient, and due to the fact that the device for monitoring the safety of the tower crane is directly installed on the tower crane, the perpendicularity of the tower crane can be monitored in real time; in general, the device for monitoring the safety of the tower crane is simple and convenient to operate, and can monitor the perpendicularity of the tower crane in real time.

Description

Technical Field

[0001] The utility model relates to the technical field of tower crane safety monitoring, and particularly relates to a device for monitoring the safety of a tower crane. Background Technique

[0002] A tower crane is the abbreviation of a tower-type crane, also known as a tower crane. It is a rotating crane with a jib installed on the upper part of a tall tower body. It has a large working space and is mainly used for the vertical and horizontal transportation of materials and the installation of building components in building construction. A tower crane usually consists of three parts: a metal structure, a working mechanism, and an electrical system. The metal structure includes a tower body, a jib, and a base, etc. The working mechanism has four parts: hoisting, luffing, slewing, and traveling. The electrical system includes motors, controllers, distribution cabinets, connecting lines, signals, and lighting devices, etc.

[0003] The safety of a tower crane is affected by various factors. Among them, the verticality is an important factor affecting the safety of a tower crane. The existing measurement methods usually use equipment such as theodolites and total stations to measure the verticality of the tower crane. These measurement methods are not only cumbersome to operate, but also the measurement interval is relatively long. During the interval between two measurements, even if the verticality of the tower crane changes significantly, the staff cannot know, and the safety cannot be guaranteed. Content of the Utility Model

[0004] (1) Technical Problems to be Solved

[0005] To solve the above problems, the utility model provides a device for monitoring the safety of a tower crane, which is simple and convenient to operate and can monitor the verticality of the tower crane in real time.

[0006] (2) Technical Solutions

[0007] To achieve the above object, the utility model provides the following technical solutions:

[0008] A device for monitoring the safety of a tower crane, used in cooperation with a tower crane, includes:

[0009] A first plate body, the plane where the first plate body is located is parallel to one side of the tower crane, and a protractor is provided on the first plate body;

[0010] A clamping assembly, the clamping assembly is installed on the first plate body and is used to fix the relative position of the tower crane and the first plate body;

[0011] A second plate body, the second plate body is rotatably connected to the bottom of the first plate body, the included angle between the first plate body and the second plate body can be measured through the protractor, and a spirit level is provided on the second plate body for measuring whether the second plate body is horizontal;

[0012] An angle adjustment component, which is installed on the second plate body and has its bottom abutting against the ground. By means of the angle adjustment component, the second plate body can be rotated around the first plate body, and in cooperation with the level, the second plate body can be rotated to a horizontal state.

[0013] Preferably, multiple sets of connecting parts are provided on the two opposite sides of the first plate body in the horizontal direction. The multiple sets of connecting parts extend along the height direction of the first plate body. Each set of connecting parts includes two first threaded holes and four guiding holes. The two first threaded holes are oppositely arranged on the two sides of the first plate body, and the four guiding holes are pairwise oppositely arranged on the two sides of the first plate body. The clamping component includes:

[0014] Two clamping blocks, which are oppositely arranged on the two opposite sides of the first plate body in the horizontal direction. The cross-section of each clamping block is in an L shape and is used for clamping the corner part of the tower crane.

[0015] Two first adjusting screws, with one first adjusting screw rotatably connected to each clamping block. One first adjusting screw is engaged in each first threaded hole. By rotating the first adjusting screw, the distance between the two clamping blocks can be adjusted, thereby fixing the relative position between the first plate body and the tower crane.

[0016] Four guiding rods, with two guiding rods fixedly connected to each clamping block. One guiding rod is slidably connected in each guiding hole, so that the clamping block can move along the direction of the guiding rod.

[0017] Preferably, the sizes of the first plate body and the clamping block are known, and scales are provided on the guiding rods to measure the length of the corresponding side surface of the tower crane in the horizontal direction.

[0018] Preferably, a plurality of vertical second threaded holes are provided on the second plate body. The angle adjustment component includes:

[0019] A plurality of second adjusting screws, the number of the plurality of second adjusting screws being the same as the number of the plurality of second threaded holes. One second adjusting screw is engaged in each second threaded hole.

[0020] A plurality of supporting members, the number of the plurality of supporting members being the same as the number of the plurality of second adjusting screws. One supporting member is provided at the bottom of each second adjusting screw and is used for abutting against the ground and supporting the second adjusting screw and the second plate body.

[0021] Preferably, a plurality of universal wheels are further included. The number of the plurality of universal wheels is the same as the number of the plurality of supporting members. One universal wheel is provided at the bottom of each supporting member and is used for reducing the friction between the supporting member and the ground.

[0022] Preferably, an alarm mechanism is further included, and the alarm mechanism includes:

[0023] a battery, which is installed on the first plate body and used for power supply;

[0024] a first conductive member, which is installed on the first plate body and electrically connected to the battery, and two first contacts are provided at the bottom of the first conductive member;

[0025] a second conductive member, which is installed on the second plate body and arranged corresponding to the first conductive member, two second contacts are provided at the top of the second conductive member, and the two second contacts are respectively arranged corresponding to the two first contacts, and there is a spacing between the first contact and the corresponding second contact, so that the first plate body and the second plate body can be in contact with each other only after the included angle between them is reduced to a specified angle;

[0026] a buzzer, which is electrically connected to the second conductive member and can emit a beep after being powered on;

[0027] a warning light, which is electrically connected to the second conductive member and can flash after being powered on;

[0028] When the included angle between the first plate body and the second plate body is reduced to a specified angle, the two first contacts respectively abut against the two corresponding second contacts, so that the battery, the first conductive member and the second conductive member can form a complete circuit, so that the buzzer emits a beep and the warning light starts to flash, thereby reminding the staff that the tower crane is unsafe at this time.

[0029] Preferably, a shielding member is provided on the first plate body and arranged corresponding to the second plate body, and the shielding member is flared and the bottom size is larger than the top size, and is used for protecting the alarm mechanism.

[0030] (III) Beneficial effects

[0031] Compared with the prior art, the beneficial effects of the present utility model are:

[0032] In the actual use process, since the tilting direction of the tower crane cannot be determined, a device for monitoring the safety of the tower crane as described above should be installed on each side of the tower crane. Finally, by comprehensively considering the verticality of all sides, the overall verticality of the tower crane can be determined. During installation, taking one side of the tower crane as an example, the first plate body is fixed on the side of the tower crane through the clamping assembly, and the plane where the first plate body is located is parallel to the corresponding side of the tower crane. Then, the verticality of the first plate body is the same as that of the corresponding side of the tower crane. Next, the second plate body is rotated around the first plate body through the angle adjustment assembly, and the second plate body is rotated to the horizontal state in cooperation with the level. At this time, the angle between the first plate body and the second plate body can be directly obtained through the protractor, that is, the verticality of the corresponding side of the tower crane. Through the design of the above structure, after the device for monitoring the safety of the tower crane is installed, measurement can be carried out without any other operations, and the operation is simple and convenient. Since the device for monitoring the safety of the tower crane is directly installed on the tower crane, the verticality of the tower crane can be monitored in real time. Generally speaking, the device for monitoring the safety of the tower crane is simple and convenient to operate and can monitor the verticality of the tower crane in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0034] Figure 1 The perspective view of the device for monitoring the safety of the tower crane of the present invention after being installed on the tower crane is shown;

[0035] Figure 2 Shows Figure 1 The enlarged view of part A in

[0036] Figure 3 The perspective view of the device for monitoring the safety of the tower crane of the present invention is shown;

[0037] Figure 4 Shows Figure 3 The perspective view of the device for monitoring the safety of the tower crane from another angle in

[0038] Figure 5 Shows Figure 3 The perspective view of the first plate body in

[0039] Figure 6 Shows Figure 3 The schematic diagram of the spatial structure of the clamping assembly in

[0040] Figure 7 Shows Figure 3 The perspective view of the second plate body in

[0041] Figure 8 Shows Figure 3Schematic diagram of the spatial structure of the middle angle adjustment component.

[0042] In the figure: 1. First plate body; 2. Clamping component; 21. Clamping block; 22. First adjusting screw; 23. Guide rod; 231. Scale; 3. Second plate body; 31. Second threaded hole; 4. Angle adjustment component; 41. Second adjusting screw; 42. Support member; 5. Tower crane; 6. Ground; 7. Protractor; 8. Level; 9. Connection part; 91. First threaded hole; 92. Guide hole; 10. Universal wheel; 11. Alarm mechanism; 111. Battery; 112. First conductive member; 1121. First contact; 113. Second conductive member; 1131. Second contact; 114. Buzzer; 115. Warning light; 12. Shielding member. Specific implementation mode

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] Refer to the attached Figure 1 and the attached Figure 2 , an embodiment of the present invention discloses a device for monitoring the safety of a tower crane, which is used in cooperation with the tower crane 5 and includes a first plate body 1, a clamping component 2, a second plate body 3, and an angle adjustment component 4. The plane where the first plate body 1 is located is parallel to one side of the tower crane 5, and a protractor 7 is provided on the first plate body 1; the clamping component 2 is installed on the first plate body 1 and is used to fix the relative position of the tower crane 5 and the first plate body 1; the second plate body 3 is rotatably connected to the bottom of the first plate body 1, and the included angle between the first plate body 1 and the second plate body 3 can be measured by the protractor 7. A level 8 is provided on the second plate body 3 and is used to measure whether the second plate body 3 is horizontal; the angle adjustment component 4 is installed on the second plate body 3 and the bottom abuts against the ground 6. By means of the angle adjustment component 4, the second plate body 3 can be rotated around the first plate body 1 and cooperate with the level 8 to rotate the second plate body 3 to a horizontal state.

[0045] During actual use, since the tilting direction of the tower crane cannot be determined, a device for monitoring the safety of the tower crane 5 should be installed on each side of the tower crane 5. Finally, by comprehensively considering the verticality of all sides, the overall verticality of the tower crane 5 can be determined. During installation, taking one side of the tower crane 5 as an example, the first plate body 1 is fixed to the side of the tower crane 5 through the clamping assembly 2, and the plane where the first plate body 1 is located is parallel to the corresponding side of the tower crane 5. Then, the verticality of the first plate body 1 is the same as that of the corresponding side of the tower crane 5. Next, the second plate body 3 is rotated around the first plate body 1 through the angle adjustment assembly 4, and the second plate body 3 is rotated to a horizontal state in cooperation with the level 8. At this time, the angle between the first plate body 1 and the second plate body 3 can be directly obtained through the protractor 7, that is, the verticality of the corresponding side of the tower crane 5. Through the design of the above structure, after the device for monitoring the safety of the tower crane is installed, measurement can be carried out without any other operations, and the operation is simple and convenient. Since the device for monitoring the safety of the tower crane is directly installed on the tower crane 5, the verticality of the tower crane 5 can be monitored in real time. Generally speaking, the device for monitoring the safety of the tower crane is simple and convenient to operate and can monitor the verticality of the tower crane in real time.

[0046] It should be noted that the size of the protractor 7 should be smaller than the distance between the second plate body 3 and the ground to prevent the protractor 7 from contacting the ground during rotation.

[0047] Refer to the appendix Figure 3 、appendix Figure 5 and appendix Figure 6 As shown in the attached drawings, there are various size specifications for the tower crane 5. In order to make the device for monitoring the safety of the tower crane adaptable to tower cranes 5 of various sizes, the following design is carried out in this embodiment. Specifically, multiple groups of connecting parts 9 are provided on the opposite sides of the first plate body 1 in the horizontal direction. The multiple groups of connecting parts 9 extend along the height direction of the first plate body 1. Each group of connecting parts 9 includes two first threaded holes 91 and four guide holes 92. The two first threaded holes 91 are oppositely arranged on both sides of the first plate body 1, and the four guide holes 92 are arranged in pairs on both sides of the first plate body 1. The clamping assembly 2 includes two clamping blocks 21, two first adjusting screws 22, and four guide rods 23. The two clamping blocks 21 are oppositely arranged on the opposite sides of the first plate body 1 in the horizontal direction. The cross-section of each clamping block 21 is L-shaped for clamping the corner part of the tower crane 5. A first adjusting screw 22 is rotatably connected to each clamping block 21, and a first adjusting screw 22 is engaged in each first threaded hole 91. By rotating the first adjusting screw 22, the distance between the two clamping blocks 21 can be adjusted to fix the relative position of the first plate body 1 and the tower crane 5. Two guide rods 23 are fixedly connected to each clamping block 21, and a guide rod 23 is slidably connected in each guide hole 92 to enable the clamping block 21 to move along the direction of the guide rod 23.

[0048] Through the design of the above structure, by rotating the first adjusting screw 22, the distance between the two clamping blocks 21 can be adjusted, so as to fix the first plate body 1 on the tower crane 5; and because multiple sets of connecting parts 9 are arranged on the first plate body 1 and are connected to the clamping assembly 2 through the connecting parts 9, and the multiple sets of connecting parts 9 are arranged along the height direction of the first plate body 1, therefore, the devices for monitoring the safety of the tower crane on the adjacent sides of the tower crane 5 can be installed without interference with each other, and different first plate bodies 1 can be arranged on the same horizontal plane.

[0049] Refer to the appendix Figure 6 , as described above, there are various size specifications of the tower crane 5, and the load-bearing capacities of tower cranes 5 with different size specifications are also different. In order to enable the staff to roughly estimate the load range according to the volume size of the tower crane 5, the following design is carried out in this embodiment. Specifically, the sizes of the first plate body 1 and the clamping block 21 are known, and a scale 231 is provided on the guide rod 23 to measure the length of the corresponding side of the tower crane 5 in the horizontal direction.

[0050] Through the design of the above structure, the staff can directly obtain the sizes of the sides of the cross-section of the tower crane 5, which is convenient for the staff to master more information and know more about the tower crane 5.

[0051] Refer to the appendix Figure 4 , appendix Figure 7 and appendix Figure 8 , in order to enable the angle adjustment assembly 4 to adjust the angle of the second plate body 3 and cooperate with the spirit level 8 to make the second plate body 3 in a horizontal state, the following design is carried out in this embodiment. Specifically, a plurality of vertical second threaded holes 31 are provided on the second plate body 3, and the angle adjustment assembly 4 includes a plurality of second adjusting screws 41 and a plurality of support members 42. The number of the plurality of second adjusting screws 41 is the same as the number of the plurality of second threaded holes 31, and each second threaded hole 31 is engaged with a second adjusting screw 41; the number of the plurality of support members 42 is the same as the number of the plurality of second adjusting screws 41, and a support member 42 is provided at the bottom of each second adjusting screw 41 for abutting against the ground 6 and supporting the second adjusting screw 41 and the second plate body 3.

[0052] Through the design of the above structure, by rotating the second adjusting screw 41, the part of the second plate body 3 can be moved up or down. Since the first plate body 1 is fixed differently and the second plate body 3 is rotatably connected to the first plate body 1, after rotating the second adjusting screw 41, the second plate body 3 can rotate around the first plate body 1, and then under the action of the spirit level 8, the second plate body 3 can be rotated to the horizontal plane.

[0053] Refer to the appendix Figure 2 and appendix Figure 8, during the rotation of the second plate body 3 around the first plate body 1, relative movement will also occur between the support member 42 and the ground 6. To prevent the friction between the support member 42 and the ground 6 from hindering the rotation of the second plate body 3, the following design is carried out in this embodiment. Specifically, it further includes a plurality of universal wheels 10. The number of the plurality of universal wheels 10 is the same as the number of the plurality of support members 42. A universal wheel 10 is provided at the bottom of each support member 42 to reduce the friction between the support member 42 and the ground 6.

[0054] Through the design of the above structure, the surface contact between the support member 42 and the ground 6 will become the line contact between the universal wheel 10 and the ground 6, and the contact area is smaller. The sliding connection between the support member 42 and the ground 6 will become the rolling connection between the universal wheel 10 and the ground 6, and the moving mode is more convenient. Generally speaking, by setting the universal wheels 10, the friction force that needs to be overcome during the movement of the angle adjustment assembly 4 can be made smaller, and the second plate body 3 can be rotated more easily and smoothly. In addition, since the universal wheel 10 can adjust the moving direction by itself according to the action of force, even if the second adjusting screw 41 is rotated, the final moving direction of the universal wheel 10 will not be changed.

[0055] Refer to the appendix Figure 3 、appendix Figure 5 and appendix Figure 7 , based on the above solution, although the staff can check the verticality of the tower crane 5 at any time, frequent checking is still relatively troublesome. To solve the above problems, the following design is carried out in this embodiment. Specifically, it further includes an alarm mechanism 11. The alarm mechanism 11 includes a battery 111, a first conductive member 112, a second conductive member 113, a buzzer 114, and a warning light 115. The battery 111 is installed on the first plate body 1 for power supply. The first conductive member 112 is installed on the first plate body 1 and electrically connected to the battery 111. Two first contacts 1121 are provided at the bottom of the first conductive member 112. The second conductive member 113 is installed on the second plate body 3 and arranged corresponding to the first conductive member 112. Two second contacts 1131 are provided at the top of the second conductive member 113. The two second contacts 1131 are respectively arranged corresponding to the two first contacts 1121. There is a distance between the first contact 1121 and the corresponding second contact 1131 so that they can contact each other only after the included angle between the first plate body 1 and the second plate body 3 is reduced to a specified angle. The buzzer 114 is electrically connected to the second conductive member 113 and can emit a beep after being powered on. The warning light 115 is electrically connected to the second conductive member 113 and can flash after being powered on.

[0056] During use, after the tower crane 5 tilts, the first plate body 1 will tilt accordingly. At this time, only looking at the side of the tower crane 5 tilting towards the ground 6, on these sides, the angle between the first plate body 1 and the second plate body 3 will continuously decrease as the tower crane 5 tilts. When it decreases to a specified angle, the two first contacts 1121 will respectively abut against the two corresponding second contacts 1131, enabling the battery 111, the first conductive member 112, and the second conductive member 113 to form a complete circuit, thereby causing the buzzer 114 to emit a beep and the warning light 115 to start flashing, thus reminding the staff that the tower crane 5 is unsafe at this time.

[0057] Through the design of the above structure, there is no need for the staff to check in real time. After the verticality of the tower crane 5 exceeds the normal range, an alarm can be automatically triggered, so that the staff no longer needs to frequently check the verticality of the tower crane 5, saving time and manpower.

[0058] Refer to the appendix Figure 2 and the appendix Figure 3 , based on the above solution, since there are multiple electrical components in the alarm mechanism 11, in order to prevent these electrical components from being affected by sunlight, rain, etc., the following design is carried out in this embodiment. Specifically, a shielding member 12 is provided on the first plate body 1 and is arranged corresponding to the second plate body 3. The shielding member 12 is flared and the bottom size is larger than the top size, for protecting the alarm mechanism 11.

[0059] Through the design of the above structure, protection can be formed for the battery 111, the first conductive member 112, the second conductive member 113, the buzzer 114, and the warning light 115, preventing sunlight and high temperature from accelerating the aging of electrical components, preventing rain from causing short circuits and leakage of electrical components, and preventing high-altitude falling objects from damaging electrical components, etc.

[0060] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0061] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without further statement, the above terms have no special meaning, so they cannot be understood as limiting the protection scope of the present application; although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for monitoring the safety of a tower crane, used in conjunction with a tower crane, characterized in that: include: A first plate body, wherein a plane where the first plate body is located is parallel to one side of the tower crane, and a protractor is provided on the first plate body; A clamping assembly, the clamping assembly is mounted on the first plate body and is used to fix the relative position of the tower crane and the first plate body; a second plate body, the second plate body being rotatably connected to the bottom of the first plate body, the angle between the first plate body and the second plate body being measurable by the protractor, and a level being provided on the second plate body for measuring whether the second plate body is level; An angle adjustment component is installed on the second plate body, and the bottom of the angle adjustment component abuts against the ground. The second plate body can be rotated around the first plate body by the angle adjustment component, and the second plate body can be rotated to a horizontal state in cooperation with the level.

2. A device for monitoring tower crane safety according to claim 1, characterized in that: The first plate body is provided with a plurality of groups of connecting parts on two opposite sides in the horizontal direction, and the plurality of groups of connecting parts are extended along the height direction of the first plate body, and each group of the connecting parts includes two first threaded holes and four guide holes, and the two first threaded holes are arranged oppositely on the two sides of the first plate body, and the four guide holes are arranged oppositely in pairs on the two sides of the first plate body, and the clamping assembly includes: Two clamping blocks, the two clamping blocks are relatively arranged on two opposite sides of the first plate in the horizontal direction, and the cross section of each clamping block is L-shaped, and is used for clamping the corner portion of the tower crane; Two first adjusting screws, each of the clamping blocks is rotatably connected to one of the first adjusting screws, each of the first threaded holes is meshed with one of the first adjusting screws, and the first adjusting screws are rotated to adjust the distance between the two clamping blocks, thereby fixing the relative positions of the first plate body and the tower crane; Four guide rods, two of which are fixedly connected to each clamping block, and one of which is slidably connected in each guide hole, so that the clamping block can move along the direction of the guide rod.

3. A device for monitoring tower crane safety according to claim 2, characterized in that: The dimensions of the first plate and the clamping block are known, and a scale is provided on the guide rod to measure the length of the corresponding side surface of the tower crane in the horizontal direction.

4. A device for monitoring tower crane safety according to claim 1, characterized in that: The second plate body is provided with a plurality of second vertical threaded holes, and the angle adjustment assembly comprises: A plurality of second adjusting screws, wherein the number of the plurality of second adjusting screws is consistent with the number of the plurality of second threaded holes, and a second adjusting screw is meshed in each of the second threaded holes; A plurality of support members, the number of which is consistent with the number of the second adjusting screws, and a support member is provided at the bottom of each second adjusting screw for contacting the ground and supporting the second adjusting screw and the second plate.

5. A device for monitoring tower crane safety according to claim 4, characterized in that: It also includes a plurality of universal wheels, the number of which is consistent with the number of the support members, and a universal wheel is provided at the bottom of each support member to reduce the friction between the support member and the ground.

6. A device for monitoring tower crane safety according to claim 1, characterized in that: Also included is an alarm mechanism, the alarm mechanism comprising: A battery, the battery being mounted on the first plate and used for power supply; A first conductive member, the first conductive member is mounted on the first plate and electrically connected to the battery, and two first contacts are provided at the bottom of the first conductive member; a second conductive member, the second conductive member being mounted on the second plate and arranged corresponding to the first conductive member, two second contacts being arranged on the top of the second conductive member, the two second contacts being arranged corresponding to the two first contacts respectively, and a spacing being provided between the first contacts and the corresponding second contacts, so that the first plate and the second plate can contact each other only after the included angle between them is reduced to a specified angle; A buzzer, the buzzer is electrically connected to the second conductive member and can emit a buzzer sound after being powered on; A warning light, the warning light is electrically connected to the second conductive member and can flash when powered on; When the angle between the first plate body and the second plate body is reduced to a specified angle, the two first contacts are respectively abutted against the two corresponding second contacts, so that the battery, the first conductive member and the second conductive member can form a complete circuit, thereby causing the buzzer to sound and the warning light to start flashing, thereby reminding the staff that the tower crane is unsafe at this time.

7. A device for monitoring tower crane safety according to claim 6, characterized in that: A shielding member is provided on the first plate body and is arranged corresponding to the second plate body. The shielding member is expanded and has a bottom size larger than a top size, so as to protect the alarm mechanism.

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