Limiting device for a tower crane and tower crane

Abstract

The utility model provides a kind of for tower crane's limiting device and tower crane, wherein, for tower crane's limiting device includes: seat, clamping piece, transmission part, elastic part and driving part;Clamping piece is rotatably arranged relative to seat, and it is used for clamping guide rail;Transmission part is set on seat, and it is rotatably connected with clamping piece, transmission part is movably arranged on seat along height direction, when transmission part moves up and down, it drives clamping piece to rotate and clamps or releases guide rail;Elastic part is abutted with transmission part, and it drives transmission part to move upwards, to provide the clamping force of clamping guide rail for clamping piece by transmission part;Driving part is drivingly connected with transmission part, and driving part can drive transmission part to move downwards, to drive clamping piece away from guide rail by transmission part.The utility model solves the problem of safety hazard in the use process of tower crane in prior art.

Description

Technical Field

[0001] This utility model relates to the field of lifting machinery technology, and more specifically, to a limiting device for a tower crane and a tower crane. Background Technology

[0002] In existing tower crane limiting technologies, the guide rail limiting of tower cranes is usually achieved through mechanical limiters or simple hydraulic limiters. Mechanical limiters mainly include spring-type and counterweight-type limiters. Although these limiters can limit the range of movement of the tower crane to a certain extent and prevent it from exceeding the safety limit, they have obvious limitations in actual operation.

[0003] First, mechanical limit switches have lower sensitivity and accuracy. Especially when the tower crane is subjected to impact or vibration, the limit switch may lose its function due to loosening of the mechanical structure, failing to provide timely and accurate limiting, thus increasing the risk of tower crane operation. Second, while simple hydraulic limit switches can provide some buffering effect, their limiting effect is still unstable due to weather changes. Especially under severe weather conditions, the hydraulic system may fail due to temperature changes or leaks, further increasing the risk of tower crane operation. Utility Model Content

[0004] The main purpose of this utility model is to provide a limiting device and a tower crane for tower cranes, so as to solve the safety hazards that exist in the use of tower cranes in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a limiting device for tower cranes is provided, comprising: a base, a clamping member, a transmission member, an elastic member, and a driving member; the clamping member is rotatably disposed relative to the base and is used to clamp a guide rail; the transmission member is disposed on the base and rotatably connected to the clamping member, and is movable on the base along the height direction; when the transmission member moves up and down, it drives the clamping member to rotate and clamp or release the guide rail; the elastic member abuts against the transmission member and drives the transmission member to move upward, so as to provide the clamping member with a clamping force to clamp the guide rail through the transmission member; the driving member is drivenly connected to the transmission member, and the driving member can drive the transmission member to move downward, so as to drive the clamping member away from the guide rail through the transmission member.

[0006] Furthermore, the clamping component includes multiple clamping arms arranged in pairs, each clamping arm being rotatably connected to the transmission component. When the transmission component moves along the height direction, it drives the paired clamping arms to clamp or release the guide rail.

[0007] Furthermore, the clamping arm has a clamping end located at the bottom of the clamping arm, and the clamping end has a protrusion. When the clamping ends approach each other, each protrusion abuts against the guide rail to clamp the guide rail.

[0008] Furthermore, the transmission component extends laterally, the clamping component is located in the middle area of ​​the transmission component, there are multiple elastic components, and elastic components are provided at both ends of the transmission component in the length direction, and the driving component is located between the two clamping arms.

[0009] Furthermore, the clamping arm includes a first segment and a second segment that are rotatably connected in sequence. The end of the first segment is rotatably connected to the transmission member, and the middle region of the second segment is rotatably connected to the base. The end of the second segment has a clamping end for clamping the guide rail. When the transmission member moves up and down, it drives the first segment to move. The first segment pushes the second segment to rotate around the connection point between the second segment and the base.

[0010] Furthermore, the limiting device also includes a guide member, which is connected to the base body, and an elastic element is sleeved on the outside of the guide member.

[0011] Furthermore, the limiting device also includes multiple guide wheels, which are located at the bottom of the base and along the forward direction of the tower crane, with at least one guide wheel located in front of the clamping member.

[0012] Furthermore, the limiting device also includes a limit switch, which is electrically connected to the driving component and is used to control the on / off state of the driving component.

[0013] Furthermore, the limiting device also includes a hydraulic pump station, with a hydraulic cylinder as the driving component. The hydraulic pump station is connected to the hydraulic cylinder and is used to control the movement of the hydraulic cylinder.

[0014] According to another aspect of the present invention, a tower crane is also provided, including the aforementioned limiting device for the tower crane.

[0015] By applying the technical solution of this utility model, an elastic element drives the transmission element to move upward, enabling the clamping element to clamp the guide rail and achieve a limit, thereby improving the safety of the tower crane during use. A driving element drives the transmission element to move downward, allowing the clamping element to release the guide rail and unlock the tower crane, thus switching it to a movable state. When the tower crane begins to move, the driving element drives the transmission element downward, causing the clamping element to release the guide rail, making the tower crane movable. When the tower crane stops moving, the driving element is deactivated, and the elastic force of the elastic element drives the transmission element upward, causing the clamping element to clamp the guide rail under the drive of the transmission element, thus limiting the tower crane and preventing accidental movement due to strong winds or other weather conditions. This improves the safety and stability of the tower crane during operation. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the limiting device for tower cranes according to this utility model is shown;

[0018] Figure 2 It shows Figure 1 Cross-sectional view.

[0019] The above figures include the following reference numerals:

[0020] 10. Base; 20. Clamping component; 21. Clamping arm; 211. First segment; 212. Second segment; 213. Clamping end; 214. Connection point; 30. Transmission component; 40. Elastic component; 50. Driving component; 60. Hydraulic pump station; 70. Limit switch; 80. Guide wheel; 90. Locking screw. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0023] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0024] In order to solve the safety hazards existing in the use of tower cranes in the prior art, this utility model provides a limiting device for tower cranes and a tower crane, wherein the tower crane includes the limiting device for tower cranes described below.

[0025] like Figure 1 and Figure 2A limiting device for a tower crane, as shown, includes: a base 10, a clamping member 20, a transmission member 30, an elastic member 40, and a driving member 50; the clamping member 20 is rotatably disposed relative to the base 10 and is used to clamp a guide rail; the transmission member 30 is disposed on the base 10 and rotatably connected to the clamping member 20, and the transmission member 30 is movable on the base 10 along the height direction, and when the transmission member 30 moves up and down, it drives the clamping member 20 to rotate and clamp or release the guide rail; the elastic member 40 abuts against the transmission member 30 and drives the transmission member 30 to move upward, so as to provide the clamping member 20 with a clamping force to clamp the guide rail through the transmission member 30; the driving member 50 is drivenly connected to the transmission member 30, and the driving member 50 can drive the transmission member 30 to move downward, so as to drive the clamping member 20 away from the guide rail through the transmission member 30.

[0026] In this embodiment, the elastic element 40 drives the transmission element 30 to move upward, allowing the clamping element 20 to clamp the guide rail and achieve a limit, thereby improving the safety of the tower crane during use. The drive element 50 drives the transmission element 30 to move downward, allowing the clamping element 20 to release the guide rail and unlock the tower crane, thus switching it to a movable state. When the tower crane starts to move, the drive element 50 drives the transmission element 30 downward, causing the clamping element 20 to release the guide rail, making the tower crane movable. When the tower crane stops moving, the drive element 50 is closed, and the elastic force of the elastic element 40 drives the transmission element 30 to move upward, allowing the clamping element 20 to clamp the guide rail under the drive of the transmission element 30, thus limiting the tower crane and preventing accidental movement due to strong winds or other weather conditions, thereby improving the safety and stability of the tower crane during operation.

[0027] In this embodiment, the limiting device is installed on the main body of the tower crane to limit and fix the tower crane when it stops moving. The base 10, as the supporting component of the limiting device, is connected to the tower crane and can withstand the vibrations generated during the movement and operation of the tower crane, ensuring the stability and reliability of the limiting device. The base 10 has an installation area in the middle that matches the guide rail along the height direction, for installing components such as the clamping component 20, the elastic component 40, and the transmission component 30, so that they match the guide rail system of the tower crane.

[0028] In this embodiment, the clamping member 20 includes a plurality of clamping arms 21 arranged in pairs. Each clamping arm 21 is rotatably connected to the transmission member 30. When the transmission member 30 moves along the height direction, it drives the paired clamping arms 21 to clamp or release the guide rail, thereby applying a clamping force to the guide rail more evenly and ensuring the stability and safety of the tower crane when it stops. Specifically, the clamping arm 21 can be hinged to the transmission member 30. When the transmission member 30 moves upward, it drives the end of the clamping arm 21 near the transmission member 30 to rotate around the transmission member 30, while the end of the clamping arm 21 away from the transmission member 30 approaches the guide rail, thereby abutting against the guide rail to achieve a limiting position. When the transmission member 30 moves downward, it drives the end of the clamping arm 21 near the transmission member 30 to rotate around the transmission member 30 in the opposite direction, while the end of the clamping arm 21 away from the transmission member 30 moves away from the guide rail, thereby releasing the guide rail and allowing the tower crane to move freely. This embodiment features two clamping arms 21, symmetrically arranged on both sides of the transmission member 30. The arrangement direction of the two clamping arms 21 is perpendicular to the extension direction of the guide rail, allowing the clamping arms 21 to clamp the guide rail on both sides, thereby applying a uniform clamping force on opposite sides of the guide rail. This effectively limits the movement of the tower crane and prevents accidental movement. Of course, multiple pairs of clamping arms 21 can be provided according to actual needs, thereby adopting a multi-point clamping method to further improve the reliability of the clamping member 20 in clamping the guide rail.

[0029] In this embodiment, the clamping arm 21 has a clamping end 213 located at the bottom of the clamping arm 21. The clamping end 213 has a protrusion. When the clamping ends 213 are close to each other, each protrusion abuts against the guide rail to clamp the guide rail, thereby facilitating the contact between the clamping arm 21 and the guide rail and improving the stability of clamping. Specifically, the protrusion is located on the side of the clamping arm 21 closest to the guide rail. The protrusions of the paired clamping arms 21 are arranged opposite to each other. When the clamping arm 21 clamps the guide rail, the guide rail is located between the two protrusions. The abutment between the protrusion and the guide rail fixes the relative position of the tower crane and the guide rail, avoiding swaying and safety risks when the tower crane stops moving. Figure 2 As shown, in this embodiment, the side of the protrusion closest to the guide rail is set as an arc-shaped surface, and the arc-shaped surface protrudes towards the guide rail, so that the protrusion can more easily approach the guide rail and abut against the guide rail. At the same time, it can ensure that when the clamping member 20 releases the guide rail, the clamping end 213 can quickly move away from the guide rail, avoiding jamming and interference, and improving the smoothness of the movement of the limiting device.

[0030] In this embodiment, the transmission member 30 extends laterally, the clamping member 20 is located in the middle region of the transmission member 30, and there are multiple elastic members 40, with elastic members 40 provided at both ends of the transmission member 30 along its length. The driving member 50 is located between the two clamping arms 21, thereby ensuring that the clamping member 20 receives a uniform driving force when the transmission member 30 moves up and down. Simultaneously, the elastic members 40 provide stable elastic force, ensuring that when the driving member 50 stops working, the transmission member 30 moves upward to reliably clamp the clamping member 20 onto the guide rail. Specifically, this embodiment provides two elastic members 40. The transmission member 30 is arranged laterally, with its length along the extension direction of the guide rail and its width perpendicular to the extension direction of the guide rail. The middle region refers to the middle region along the length of the clamping member 20. The driving member 50 is located directly below the middle region of the transmission member 30. One end of the driving member 50 is connected to the base 10, and the other end is connected to the transmission member 30. When the driving member 50 is working, it can drive the transmission member 30 to move downward. The paired clamping arms 21 are arranged along the width direction of the transmission member 30 and are located in the middle area of ​​the length direction of the transmission member 30, and are hinged to both sides of the width direction of the transmission member 30; the elastic members 40 are arranged along the length direction of the transmission member 30 and are symmetrically arranged on both sides of the clamping member 20, and abut against the bottom of the transmission member 30. When the driving component 50 drives the transmission component 30 downward, the clamping component 20 releases the guide rail, and the elastic component 40 is in a compressed state, providing an upward force for the transmission component 30. At this time, the downward force applied by the driving component 50 to the transmission component 30 is greater than the elastic force of the elastic component 40, thus ensuring that the driving component 50 can drive the transmission component 30 downward to release the clamping component 20 from the guide rail and ensure the free movement of the tower crane. When the driving component 50 is engaged, the force applied by the driving component 50 to the transmission component 30 disappears, and the elastic force of the elastic component 40 causes the transmission component 30 to move upward, thereby driving the clamping component 20 to clamp the guide rail, thus limiting the tower crane and preventing swaying or accidental movement that could lead to an accident. Optionally, the elastic component 40 can be configured as a spring, providing an elastic force along the height direction to drive the transmission component 30 upward.

[0031] In this embodiment, the clamping arm 21 includes a first segment 211 and a second segment 212 that are rotatably connected in sequence. The end of the first segment 211 is rotatably connected to the transmission member 30, and the middle region of the second segment 212 is rotatably connected to the base 10. The end of the second segment 212 has a clamping end 213 for clamping the guide rail. When the transmission member 30 moves up and down, it drives the first segment 211 to move. The first segment 211 pushes the second segment 212 to rotate around the connection point 214 between the second segment 212 and the base 10, thereby enabling more flexible clamping action and achieving precise clamping of the guide rail. Specifically, the clamping arm 21 is configured as a shape similar to "7". The first segment 211 and the second segment 212 are both configured as connecting rods. The end of the first segment 211 away from the second segment 212 is hinged to the transmission member 30. The end of the second segment 212 away from the first segment 211 has a clamping end 213. The connection point 214 is located between the two ends of the second segment 212. When the clamping arm 21 moves away from the guide rail, the two first segments 211 of the paired clamping arms 21 form a V-shape with the transmission component 30. That is, the first segment 211 is inclined to the horizontal direction, and the end of the first segment 211 connected to the transmission component 30 is lower than the end of the first segment 211 connected to the second segment 212. As a result, when the drive component 50 stops working, the elastic component 40 drives the transmission component 30 to rise, which causes the end of the first segment 211 connected to the transmission component 30 to rise accordingly. The first segment 211 rotates around the transmission component 30, which reduces the angle between the first segment 211 and the horizontal direction. The connection point 214 of the first segment 211 and the second segment 212 moves away from the transmission component 30, which causes the end of the second segment 212 away from the first segment 211, that is, the clamping end 213, to move closer to the guide rail, so that the protrusion abuts against the guide rail, thereby clamping the guide rail and limiting the tower crane to prevent it from moving arbitrarily. The movement process of the clamping member 20 switching from the state of clamping the guide rail to the state of releasing the guide rail is the same as the principle of the movement process described above, and will not be repeated here.

[0032] It should be noted that the middle region of the second segment 212 refers to the region between the two ends of the second stage. The connection point 214 between the second segment 212 and the base 10 is located in the middle region. It can be any point in the middle region near the end of the second segment 212, or it can be the center of the middle region. The different positions of the connection point 214 will result in different forces that drive the clamping arm 21 to rotate. As long as the clamping arm 21 has sufficient clamping force on the guide rail, it is acceptable.

[0033] In this embodiment, the limiting device further includes a guide member connected to the base 10. An elastic member 40 is sleeved on the outside of the guide member, providing support and guidance for the elastic member 40, ensuring that the elastic member 40 does not shift or deform during operation, and guaranteeing that the elastic member 40 moves along the height direction, thereby ensuring the effectiveness of the tower crane's limiting function. Specifically, in this embodiment, the guide member is rod-shaped and extends along the height direction, allowing the elastic member 40 to deform vertically, thus providing a vertical force to the transmission member 30 and ensuring the movement of the transmission member 30 along the height direction.

[0034] In this embodiment, the limiting device also includes multiple guide wheels 80. The guide wheels 80 are located at the bottom of the base 10 and along the forward direction of the tower crane. At least one guide wheel 80 is located in front of the clamping member 20. Thus, on the one hand, the guide wheel 80 can sense the state of the guide rail or obstacles in advance to ensure the safety of the clamping member 20. On the other hand, it provides a guiding function to ensure that when the tower crane moves, the limiting device moves normally along the extension direction of the guide rail with the tower crane. Specifically, the guide wheel 80 is located at the bottom of the limiting device and connected to the base 10. In this embodiment, guide wheels 80 are provided on both sides of the clamping member 20 along the forward direction of the tower crane and the extension direction of the guide rail. The guide wheel 80 located in front of the clamping member 20 can detect obstacles in advance to avoid collisions and damage to the clamping member 20, thereby ensuring the safety of the clamping member 20. At the same time, the arrangement of multiple guide wheels 80 can provide guidance for the movement of the limiting device, ensuring that the limiting device can remain stable when moving with the tower crane, reducing swaying caused by uneven ground or obstacles, and preventing the limiting device from deviating from the track and causing damage when the tower crane moves, thereby ensuring the safety of the limiting device. Moreover, the arrangement of multiple guide wheels 80 can also provide preliminary positioning for the clamping cooperation between the clamping member 20 and the guide rail, ensuring that the clamping member 20 can accurately contact and cooperate with the guide rail when clamping the guide rail, thereby improving clamping efficiency.

[0035] In this embodiment, the limiting device also includes a limit switch 70, which is electrically connected to the drive component 50 and used to control the on / off state of the drive component 50, thereby achieving timely control of the drive component 50. Specifically, when the tower crane moves to the predetermined position, the tower crane stops moving, and closing the limit switch 70 can promptly cut off the power supply to the drive component 50, thereby causing the drive component 50 to stop applying force to the transmission component 30. This allows the transmission component 30 to move upward under the action of the elastic member 40 and drive the clamping member 20 to clamp the guide rail. In this way, closing the limit switch 70 cuts off the power to the drive component 50, allowing the clamping component 20 to clamp the guide rail via the elastic component 40. This avoids the limit device's dependence on power, ensuring reliable limit operation of the tower crane in the power-off state. Even in the event of line damage, the tower crane can remain safe and stationary, thus coping with extreme weather conditions such as strong winds and thunderstorms, ensuring safety during tower crane operation. At the same time, the limit switch 70, unlike the tower crane's power switch, ensures that the limit device can flexibly switch between clamping and releasing the guide rail when the tower crane is powered on.

[0036] In this embodiment, the limiting device also includes a hydraulic pump station 60, and the driving component 50 is a hydraulic cylinder. The hydraulic pump station 60 is connected to the hydraulic cylinder and is used to control the movement of the hydraulic cylinder, thereby providing a stable and controllable driving force to the hydraulic cylinder, thus ensuring that the movement of the clamping component 20 is more accurate. The control of the hydraulic pump station 60 can be manual or automatic, and can be adjusted according to the working mode and safety requirements of the tower crane.

[0037] In this embodiment, the limiting device may further include a manual locking component, which may be a locking screw 90. The locking screw 90 is placed along the height direction. The transmission component 30 is provided with a through hole for the locking screw 90 to pass through. The through hole and the locking screw 90 are clearance-fitted to ensure that the locking screw 90 can move up and down within the through hole. The end of the locking screw 90 is connected to the base 10. The transmission component 30 and the elastic component 40 pass through the locking screw 90 along the height direction, and locking nuts are provided at both ends of the locking screw 90. The elastic component 40 and the transmission component 30 are located at the locking nuts at both ends. When the driving component 50 and the elastic component 40 can ensure the normal operation of the limit device, the locking screw 90 has no effect. When the tower crane is powered off, the limit switch 70 cannot be activated, or the driving component 50 fails, causing the clamping arm 21 to be unable to release the guide rail, the locking nut at the end of the locking screw 90 can be rotated to reduce the distance between the two locking nuts, thereby driving the transmission component 30 to move downward, and then driving the clamping component 20 to release the guide rail. This allows the limit device to clamp and release the guide rail even when the power is off, thus facilitating the maintenance of the limit device.

[0038] The operation of the limiting device in this embodiment is as follows: Before the tower crane's traveling system is powered on and ready to move, the limiting switch 70 of the limiting device opens approximately one second in advance, releasing the lock between the clamp and the rail, allowing the tower crane to move normally. When the tower crane reaches the designated position, the tower crane traveling system is powered off, the limiting switch 70 is de-energized, and the clamping arm 21, after a delay of approximately one second, clamps the guide rail, locking the limiting device to the guide rail. This ensures that the tower crane remains locked to the guide rail at all times except during movement, preventing accidents such as slippage due to the tower crane's inability to be secured in time during sudden winds.

[0039] It should be noted that "multiple" in the above embodiments refers to at least two.

[0040] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0041] 1. It solves the safety hazards that exist in the use of tower cranes in existing technologies;

[0042] 2. By setting up an elastic element to drive the transmission element to move upward, the clamping element can clamp the guide rail to achieve the limit, thereby improving the safety of the tower crane during use. By setting up a driving element to drive the transmission element to move downward, the clamping element can release the guide rail to unlock the tower crane, thereby switching the tower crane to a movable state.

[0043] 3. When the tower crane starts to move, the drive component drives the transmission component to move downward, causing the clamping component to release the guide rail, allowing the tower crane to move. When the tower crane stops moving, the drive component is turned off, and the elastic force of the elastic component drives the transmission component to move upward, so that the clamping component clamps the guide rail under the drive of the transmission component, thereby limiting the tower crane and preventing accidental movement of the tower crane due to strong winds or other weather conditions, thus improving the safety and stability of the tower crane during operation.

[0044] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0045] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0046] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A limiting device for tower cranes, characterized in that, include: base(10); Clamping member (20), which is rotatably disposed relative to the base (10) and is used to clamp the guide rail; Transmission component (30), the transmission component (30) is disposed on the seat (10) and rotatably connected to the clamping component (20). The transmission component (30) is movably disposed on the seat (10) along the height direction. When the transmission component (30) moves up and down, it drives the clamping component (20) to rotate and clamp or release the guide rail. An elastic element (40) abuts against the transmission element (30) and drives the transmission element (30) to move upward, so as to provide the clamping force for the clamping element (20) to clamp the guide rail through the transmission element (30); A driving member (50) is driven to be connected to the transmission member (30), and the driving member (50) is capable of driving the transmission member (30) to move downward so as to drive the clamping member (20) away from the guide rail via the transmission member (30).

2. The limiting device for tower cranes according to claim 1, characterized in that, The clamping member (20) includes a plurality of clamping arms (21) arranged in pairs. Each clamping arm (21) is rotatably connected to the transmission member (30). When the transmission member (30) moves along the height direction, it drives the pair of clamping arms (21) to clamp or release the guide rail.

3. The limiting device for tower cranes according to claim 2, characterized in that, The clamping arm (21) has a clamping end (213) located at the bottom of the clamping arm (21). The clamping end (213) has a protrusion. When the clamping ends (213) are close to each other, each protrusion abuts against the guide rail to clamp the guide rail.

4. The limiting device for tower cranes according to claim 2, characterized in that, The transmission member (30) extends laterally, the clamping member (20) is located in the middle area of ​​the transmission member (30), there are multiple elastic members (40), and the elastic members (40) are provided at both ends of the transmission member (30) in the length direction. The driving member (50) is located between the two clamping arms (21).

5. The limiting device for tower cranes according to claim 3, characterized in that, The clamping arm (21) includes a first segment (211) and a second segment (212) that are rotatably connected in sequence. The end of the first segment (211) is rotatably connected to the transmission member (30), and the middle region of the second segment (212) is rotatably connected to the seat (10). The end of the second segment (212) has a clamping end (213) for clamping the guide rail. When the transmission member (30) moves up and down, it drives the first segment (211) to move. The first segment (211) pushes the second segment (212) to rotate around the connection point (214) between the second segment (212) and the seat (10).

6. The limiting device for a tower crane according to any one of claims 1 to 5, characterized in that, The limiting device also includes a guide member, which is connected to the seat (10), and the elastic member (40) is sleeved on the outside of the guide member.

7. The limiting device for a tower crane according to any one of claims 1 to 5, characterized in that, The limiting device also includes a plurality of guide wheels (80), which are located at the bottom of the base (10) and along the forward direction of the tower crane, with at least one of the guide wheels (80) located in front of the clamping member (20).

8. The limiting device for a tower crane according to any one of claims 1 to 5, characterized in that, The limiting device also includes a limit switch (70), which is electrically connected to the driving member (50) and is used to control the on / off state of the driving member (50).

9. The limiting device for a tower crane according to any one of claims 1 to 5, characterized in that, The limiting device also includes a hydraulic pump station (60), the driving component (50) is a hydraulic cylinder, the hydraulic pump station (60) is connected to the hydraulic cylinder and is used to control the action of the hydraulic cylinder.

10. A tower crane, characterized in that, Includes the limiting device for tower cranes as described in any one of claims 1 to 9.

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