Trolley locking device and flat-head movable arm tower crane

Abstract

The utility model discloses a trolley locking device and tower crane, the trolley locking device comprises a locking seat, a locking mechanism and an anti-exit mechanism, the locking seat is arranged on a cargo boom and forms a locking space for a variable-amplitude trolley to enter, a fixing hole corresponding to a pin shaft hole of the variable-amplitude trolley is formed in the side wall of the locking space, and the locking mechanism and the anti-exit mechanism are arranged on the locking seat. The locking mechanism comprises a telescopic driving assembly located on the outer side of the locking seat and a locking rod in driving connection with the telescopic driving assembly, the telescopic driving assembly is used for driving the locking rod to penetrate through the fixing hole and the pin shaft hole, and a limiting notch is formed in the end, extending out of the locking space, of the locking rod; according to the trolley locking device, axial locking of the locking rod can be achieved, in the movable arm mode, even if locking of the telescopic driving assembly fails, axial retreating of the locking rod can be avoided, and the using safety of the flat-head movable arm tower crane is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cranes, and in particular relates to a trolley locking device and a flat-top movable arm tower crane. Background Art

[0002] The flat-top luffing jib tower crane is a tower crane with two working modes: flat-arm lifting and boom lifting. A luffing trolley for installing a hook is provided on the boom of the tower crane. In the flat-arm mode, the luffing trolley can move freely along the boom, and the luffing adjustment is achieved by moving the luffing trolley. In the boom mode, the luffing trolley is in a fixed state, and the luffing adjustment is achieved by changing the pitch angle of the boom.

[0003] In the prior art, when a flat-top boom tower crane switches from flat-boom mode to boom mode, the luffing trolley needs to be moved to the boom tip. An electric push rod is provided on the boom tip. After the pin shaft hole on the luffing trolley is aligned with the fixing hole on the boom tip, the electric push rod pushes the pin shaft through the pin shaft hole and the fixing hole, thereby fixing the luffing trolley to the boom tip. In this solution, the axial movement of the pin shaft is prevented only by the self-locking force of the electric push rod. If the electric push rod fails, the pin shaft may be axially withdrawn, thereby causing a safety accident. Utility Model Content

[0004] In view of the above-mentioned defects or shortcomings, the utility model provides a trolley locking device and a flat-top boom tower crane, aiming to solve the technical problem in the prior art that only the self-locking force of the electric push rod is relied upon to prevent the axial withdrawal of the pin shaft, which poses a safety risk.

[0005] To achieve the above-mentioned purpose, the utility model provides a trolley locking device, wherein the trolley locking device includes a locking seat, a locking mechanism and an anti-exit mechanism, the locking seat is arranged on the lifting arm and forms a locking space for the luffing trolley to enter, and a fixing hole corresponding to the pin shaft hole of the luffing trolley is formed on the side wall of the locking space, the locking mechanism includes a telescopic driving assembly located outside the locking seat and a locking rod drivingly connected to the telescopic driving assembly, the telescopic driving assembly is used to drive the locking rod to pass through the fixing hole and the pin shaft hole, and one end of the locking rod extends out of the locking space to form a limited notch, and the anti-exit mechanism is arranged on the locking seat and is used to extend into or exit the limited notch.

[0006] In an embodiment of the utility model, the locking seat and the telescopic drive assembly are both located on the lower side of the lifting arm, and the locking seat is provided with a guide space and a locking space in sequence from top to bottom, the telescopic end of the telescopic drive assembly can be extended into or out of the guide space, and a connecting plate is connected to the telescopic end, the connecting plate is located on the outer side of the locking seat close to the telescopic drive assembly, and the locking rod is provided on the connecting plate and is located on the lower side of the telescopic drive assembly.

[0007] In an embodiment of the utility model, the telescopic end of the telescopic drive assembly includes a telescopic rod of a telescopic drive arrangement and a cylinder sleeve which is sleeved on the outside of the telescopic rod and connected to the telescopic rod. The cylinder sleeve is used to be sleeved on the outside of the fixed cylinder of the telescopic drive assembly when the telescopic rod is retracted, and the connecting plate is arranged on the outside of the cylinder sleeve.

[0008] In an embodiment of the utility model, the trolley locking device also includes a guide sleeve arranged in the guide space and through which the cylinder sleeve can pass. The end of the guide sleeve arranged toward the connecting plate is provided with an extended cylinder section extending out of the guide space. The extended cylinder section is used to allow the cylinder sleeve to stay when the telescopic rod is retracted.

[0009] In an embodiment of the utility model, the telescopic drive assembly further comprises a mounting seat fixed to the lower side of the boom, and the mounting seat is hinged to the mounting end of the fixed cylinder.

[0010] In an embodiment of the utility model, the limiting notch is arranged in a ring shape along the circumference of the locking rod, the number of the anti-exit mechanisms is two, and the two anti-exit mechanisms are arranged opposite to each other with a fixed hole spaced therebetween.

[0011] In an embodiment of the utility model, the anti-exit mechanism is configured as an electromagnetic lock, a lock head of the electromagnetic lock can be elastically compressed, and a side of the lock head facing the locking seat is an inclined surface.

[0012] In an embodiment of the utility model, the locking seat comprises a seat body and a positioning assembly, the seat body forms a locking space and a fixing hole, and the positioning assembly is arranged on the seat body and is used to abut against the luffing trolley.

[0013] In an embodiment of the utility model, the positioning assembly includes a reference block and an adjusting bolt. The reference block is arranged on the seat body. The adjusting bolt is screwed through the reference block. The end of the adjusting bolt away from the reference block is used to abut the variable-length trolley.

[0014] In order to achieve the above-mentioned objectives, the utility model also provides a flat-top boom tower crane, wherein the flat-top boom tower crane comprises a luffing trolley which can move freely along the boom and the trolley locking device in the above-mentioned embodiment, a buffer block is arranged on the side of the luffing trolley facing the trolley locking device, and a pin shaft hole is formed on the body of the luffing trolley which passes through the trolley along the width direction of the boom.

[0015] Through the above technical solution, the trolley locking device and the flat-top boom tower crane provided by the embodiment of the utility model have the following beneficial effects:

[0016] When the above-mentioned trolley locking device is used, it includes a locking seat, a locking mechanism and an anti-exit mechanism. The locking seat is formed with a locking space and a fixing hole. The locking mechanism and the anti-exit mechanism are arranged on both sides of the locking seat. The locking mechanism includes a telescopic drive assembly and a locking rod. A limited notch is formed on the locking rod. When the flat-top boom tower crane switches from the flat-boom mode to the boom mode, the luffing trolley runs along the boom to the locking space. After the pin shaft hole on the luffing trolley is aligned with the fixing hole on the locking seat, the telescopic drive assembly drives the locking rod to pass through the fixing hole and the pin shaft hole. Finally, the anti-exit mechanism extends into the limited notch to achieve axial locking of the locking rod. In the boom mode, even if the locking of the telescopic drive assembly fails, the axial exit of the locking rod can be avoided, which effectively improves the safety of the flat-top boom tower crane.

[0017] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0019] Figure 1 It is a schematic diagram of a trolley locking device in a locked state according to an embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of a trolley locking device in an initial state according to an embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of a trolley locking device and a luffing trolley according to an embodiment of the utility model;

[0022] Figure 4 It is a schematic diagram of a luffing trolley according to an embodiment of the utility model;

[0023] Figure 5 It is a schematic diagram of an anti-ejection mechanism according to an embodiment of the utility model;

[0024] Figure 6 It is a side view of an anti-ejection mechanism according to an embodiment of the utility model.

[0025] Description of Reference Numerals

[0026] 1 Locking seat 11 Seat body

[0027] 12 Positioning assembly 121 Reference block

[0028] 122 Adjusting bolt 13 Locking space

[0029] 14 Guide space 15 Fixing hole

[0030] 2 Locking mechanism 21 Telescopic drive assembly

[0031] 211 Fixed cylinder 212 Telescopic rod

[0032] 213 Cylinder sleeve 214 Mounting seat

[0033] 22 Locking rod 221 Limiting notch

[0034] 23 Connecting plate 3 Anti-exit mechanism

[0035] 31 Lock 32 Spring

[0036] 4 Luffing trolley 41 Buffer block

[0037] 42 Pin hole 5 Lifting arm

[0038] 6 Guide sleeve DETAILED DESCRIPTION

[0039] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0040] The trolley locking device of the present invention will be described below with reference to the accompanying drawings.

[0041] like Figure 1 and Figure 2 As shown, the utility model provides a trolley locking device, wherein the trolley locking device comprises:

[0042] The locking seat 1 is arranged on the boom 5 and is formed with a locking space 13 for the luffing trolley 4 to enter, and a fixing hole 15 corresponding to the pin hole 42 of the luffing trolley 4 is formed on the side wall of the locking space 13;

[0043] The locking mechanism 2 includes a telescopic driving assembly 21 located outside the locking seat 1 and a locking rod 22 drivingly connected to the telescopic driving assembly 21. The telescopic driving assembly 21 is used to drive the locking rod 22 to pass through the fixing hole 15 and the pin hole 42, and one end of the locking rod 22 extends out of the locking space 13 to form a limited position notch 221;

[0044] The anti-exit mechanism 3 is disposed on the locking seat 1 and is used to extend into or exit the limiting notch 221 .

[0045] When the above-mentioned trolley locking device is used, it includes a locking seat 1, a locking mechanism 2 and an anti-exit mechanism 3. The locking seat 1 is formed with a locking space 13 and a fixing hole 15. The locking mechanism 2 and the anti-exit mechanism 3 are arranged on both sides of the locking seat 1. The locking mechanism 2 includes a telescopic drive assembly 21 and a locking rod 22. A limited notch 221 is formed on the locking rod 22. When the flat-top boom tower crane switches from the flat-top mode to the boom mode, the luffing trolley 4 runs along the boom 5 to the locking space 13. After the pin shaft hole 42 on the luffing trolley 4 is aligned with the fixing hole 15 on the locking seat 1, the telescopic drive assembly 21 drives the locking rod 22 to pass through the fixing hole 15 and the pin shaft hole 42. Finally, the anti-exit mechanism 3 extends into the limited notch 221 to achieve axial locking of the locking rod 22. In the boom mode, even if the locking of the telescopic drive assembly 21 fails, the axial withdrawal of the locking rod 22 can be avoided, which effectively improves the safety of the flat-top boom tower crane.

[0046] In the embodiment of the utility model, the locking seat 1 and the telescopic drive assembly 21 are both located at the lower side of the boom 5, and the locking seat 1 is provided with a guide space 14 and a locking space 13 from top to bottom, the telescopic end of the telescopic drive assembly 21 can be extended into or out of the guide space 14, and the telescopic end is connected with a connecting plate 23, the connecting plate 23 is located at the outer side of the locking seat 1 near the telescopic drive assembly 21, and the locking rod 22 is arranged on the connecting plate 23 and located at the lower side of the telescopic drive assembly 21. In the boom mode, the luffing trolley 4 enters the locking space 13, and the luffing trolley 4 and the boom 5 are separated by the guide space 14. The setting of the connecting plate 23 enables the telescopic drive assembly 21 and the locking rod 22 to be installed in an up-and-down dislocation, so that the telescopic drive assembly 21 can be installed on the boom 5 to ensure the stability of the installation of the telescopic drive assembly 21, and the setting of the locking rod 22 corresponding to the locking space 13 can also be realized.

[0047] It should be noted that, in the embodiment of the utility model, the telescopic drive assembly 21 can be a component with a telescopic function, such as an electric cylinder, a hydraulic cylinder, or a pneumatic cylinder. Considering the strength of the telescopic rod 212 itself and the need to protect the telescopic rod 212, a solid locking rod 22 is provided as a force-bearing member. If the telescopic rod 212 itself has sufficient strength, the locking rod 22 can be removed, and the telescopic rod 212 can be directly used as a force-bearing member to fix the variable-length trolley 4.

[0048] In the embodiment of the utility model, the telescopic end of the telescopic drive assembly 21 includes a telescopic rod 212 that can be telescopically driven and a cylinder sleeve 213 that is sleeved on the outside of the telescopic rod 212 and connected to the telescopic rod 212. The cylinder sleeve 213 is used to be sleeved on the outside of the fixed cylinder 211 of the telescopic drive assembly 21 when the telescopic rod 212 is retracted, and the connecting plate 23 is arranged on the outside of the cylinder sleeve 213. Figure 1 and Figure 2When the telescopic rod 212 is retracted, the locking rod 22 is arranged in parallel with the fixed cylinder 211. When the telescopic rod 212 is extended, the locking rod 22 and the cylinder sleeve 213 are respectively extended into the locking space 13 and the guide space 14 of the locking seat 1 in a one-to-one correspondence. By setting the connecting plate 23 and the cylinder sleeve 213, the overall length of the locking mechanism 2 is reduced while meeting the displacement length requirement of the locking rod 22. Then, when the lateral space of the boom 5 is limited, the telescopic drive assembly 21 is arranged as a whole directly below the boom 5 to protect the telescopic drive assembly 21. Of course, for some large flat-top boom tower cranes, if the lateral space of the boom 5 is sufficient, the locking rod 22 can also be directly connected to the telescopic rod 212 to form a straight rod.

[0049] Specifically, the telescopic drive assembly 21 includes an electric push rod composed of a fixed cylinder 211 and a telescopic rod 212. The front end of the telescopic rod 212 is provided with a connection structure (which may be an external thread segment or an internal thread hole, etc.), and a connection block matching the above connection structure is provided in the cylinder sleeve 213, so that the telescopic rod 212 and the cylinder sleeve 213 are fixed as a whole, and the cylinder sleeve 213 moves synchronously with the telescopic rod 212, and the cylinder sleeve 213 drives the locking rod 22 to move synchronously through the connecting plate 23. Further, the end of the cylinder sleeve 213 is formed with an external thread segment, and the connecting plate 23 is formed with an internal thread hole corresponding thereto, and the cylinder sleeve 213 is connected to the connecting plate 23 by threads; the connecting plate 23 is also formed with a mounting hole, and the end of the locking rod 22 is formed with a connecting portion, which abuts against the side of the connecting plate 23 away from the locking seat 1, and the main rod portion of the locking rod 22 passes through the mounting hole, and the connecting portions are fixedly connected by bolts. In the above arrangement, the cylinder sleeve 213, the connecting plate 23 and the locking rod 22 are all detachably connected and can be freely replaced according to the wear conditions.

[0050] In the embodiment of the utility model, the trolley locking device also includes a guide sleeve 6 arranged in the guide space 14 and for the cylinder sleeve 213 to pass through. The end of the guide sleeve 6 facing the connecting plate 23 is provided with an extension tube section extending out of the guide space 14. The extension tube section is used to allow the cylinder sleeve 213 to stay when the telescopic rod 212 is retracted. Then the telescopic rod 212 and the cylinder sleeve 213 can only move along the guide sleeve 6, and the telescopic drive assembly 21 always maintains a state of being aligned with the guide space 14, avoiding the locking rod 22 from colliding with the locking seat 1, and ensuring the reliability of fixing the variable-length trolley 4. Specifically, the length of the starting section is determined according to the preset extension amount of the telescopic rod 212. When the telescopic rod 212 reaches the preset extension amount, the connecting plate 23 abuts against the starting section, the locking rod 22 passes through the locking seat 1, and the limiting notch 221 is directly opposite to the anti-exit mechanism 3.

[0051] In the embodiment of the utility model, the telescopic drive assembly 21 further includes a mounting seat 214 fixed to the lower side of the lifting arm 5, and the mounting seat 214 can be hinged to the fixed cylinder 211. Figure 2 As shown, in the telescopic drive assembly 21, a connecting ear plate serving as a mounting end is provided at the tail of the fixed cylinder 211, and the mounting seat 214 is connected to the fixed cylinder 211 in a hinged manner, so that the telescopic drive assembly 21 has a certain pitch adjustment angle. During the processing and assembly of the locking seat 1, even if there is a certain deviation in the position of the guide space 14 due to a processing error, the pitch angle of the telescopic drive assembly 21 can be fine-tuned to ensure that the cylinder sleeve 213 can be inserted into the guide sleeve 6.

[0052] In the embodiment of the utility model, the limiting notch 221 is arranged in an annular shape along the circumference of the locking rod 22, the number of the anti-exit mechanism 3 is two, and the two anti-exit mechanisms 3 are arranged opposite to each other with the fixing hole 15 spaced apart to ensure the reliability of the axial fixation of the locking rod 22. The limiting notch 221 arranged in an annular shape can reduce the requirements for the machining and installation accuracy of the locking rod 22, and ensure that the anti-exit mechanism 3 can accurately extend into the limiting notch 221. Of course, it is also possible to set the anti-exit mechanism 3 to other numbers, and / or the limiting notch 221 can be opened separately corresponding to the anti-exit mechanism 3.

[0053] In the embodiment of the utility model, the anti-exit mechanism 3 is configured as an electromagnetic lock, the lock head 31 of the electromagnetic lock can be elastically compressed, and the side of the lock head 31 facing the locking seat 1 is an inclined surface. The lock head 31 of the electromagnetic lock extends when it is de-energized, and retracts when it is energized. In other words, even if the electromagnetic lock fails, the lock head 31 will still be placed in the limit notch 221, further improving the safety of the flat-top boom tower crane. Of course, the utility model is not limited to this, and the anti-exit mechanism 3 can also be configured as other types of devices such as hydraulic locks and pneumatic locks. Specifically, see Figure 5 A spring 32 is provided in the electromagnetic lock, and a bevel is formed at the front end of the lock head 31. In the power-off state, the spring 32 pushes the lock head 31 out. In the power-on state, a magnetic field is formed at the bottom of the electromagnetic lock to attract the lock head 31, and the spring 32 is compressed. Figure 6 The side of the electromagnetic lock is provided with a connection hole 33 for fasteners to pass through, so as to fix the electromagnetic lock on the locking seat 1

[0054] In the embodiment of the utility model, the locking seat 1 includes a seat body 11 and a positioning assembly 12. The seat body 11 is composed of two vertical plates arranged at intervals. The two vertical plates are spaced to form a locking space 13. Both vertical plates are formed with fixing holes 15. The positioning assembly 12 is arranged on the seat body 11 and is used to abut the luffing trolley 4. When the flat arm mode is switched to the boom mode, the positioning assembly 12 limits the fixed position of the trolley. When the luffing trolley 4 moves to abut the positioning assembly 12, the pin hole 42 of the luffing trolley 4 is aligned with the fixing hole 15 of the seat body 11, ensuring that the locking rod 22 can smoothly pass through the locking seat 1 and the luffing trolley 4.

[0055] like Figure 3 As shown, in the embodiment of the utility model, the positioning assembly 12 includes a reference block 121 and an adjusting bolt 122, the reference block 121 is arranged on the seat body 11, the adjusting bolt 122 can be screwed through the reference block 121, and the end of the adjusting bolt 122 away from the reference block 121 is used to abut the luffing trolley 4. For large machinery such as cranes, due to manufacturing errors, the fixed reference block 121 is difficult to accurately limit the position of the luffing trolley 4, and by screwing the adjusting bolt 122, the extension length of the adjusting bolt 122 can be adjusted, so that the luffing trolley 4 is accurately limited according to the position of the pin shaft hole 42 of the luffing trolley 4 on each flat-top boom tower crane and the position of the fixing hole 15 of the seat body 11, ensuring that the locking rod 22 can smoothly pass through the locking seat 1 and the luffing trolley 4.

[0056] In order to achieve the above-mentioned object, the utility model further provides a flat-top boom tower crane, wherein the flat-top boom tower crane comprises a luffing trolley 4 that can move freely along a boom 5 and a trolley locking device in the above-mentioned embodiment, wherein the trolley locking device is arranged on the boom tip section of the boom 5, see Figure 4 A buffer block 41 is provided on the side of the luffing trolley 4 facing the trolley locking device, and a pin shaft hole 42 is formed on the body of the luffing trolley 4 and penetrates along the width direction of the boom 5.

[0057] Specifically, the flat-top boom tower crane has two operating modes: flat-boom mode and boom mode. The switching process between the two operating modes is as follows:

[0058] Switch from horizontal arm mode to boom mode

[0059] When the luffing trolley 4 runs to the boom tip and the buffer block 41 of the luffing trolley 4 contacts the adjusting bolt 122, the pin hole 42 of the luffing trolley 4 is aligned with the fixing hole 15 of the locking seat 1, and the telescopic rod 212 drives the locking rod 22 to pass through the pin hole 42 and the fixing hole 15. After the locking rod 22 passes through the locking seat 1, it abuts against the lock head 31 of the electromagnetic lock. As the telescopic rod 212 continues to extend until the connecting plate 23 abuts against the guide sleeve 6, the lock head 31 is first elastically compressed during this process. When the lock head 31 is directly opposite to the limiting notch 221, the lock head 31 elastically resets to axially fix the locking rod 22. At the same time, the luffing trolley 4 and the boom tip are also fixed as a whole.

[0060] The flat-top boom switches from boom mode to flat-top mode

[0061] After the electromagnetic lock is energized, the lock head 31 withdraws from the limit notch 221 under the action of the electromagnetic force, and the locking rod 22 moves axially under the drive of the telescopic rod 212 and withdraws from the fixing hole 15 and the pin shaft hole 42, and the trolley can move horizontally on the lower main chord of the crane arm 5 to achieve luffing action.

[0062] In summary, the flat-top boom tower crane proposed in the utility model can effectively solve the problem of unreliable self-locking force of the electric push rod to prevent retreat. Through the mechanical anti-locking of the electromagnetic lock, it can effectively avoid the accident of the locking rod 22 withdrawing and damaging the crane arm 5 due to the failure of the self-locking of the electric push rod.

[0063] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0064] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0066] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A trolley locking device, characterized in that: The trolley locking device comprises: A locking seat (1) is arranged on the boom (5) and is formed with a locking space (13) for the luffing trolley (4) to enter, and a fixing hole (15) corresponding to the pin hole (42) of the luffing trolley (4) is formed on the side wall of the locking space (13); The locking mechanism (2) comprises a telescopic drive assembly (21) located outside the locking seat (1) and a locking rod (22) drivingly connected to the telescopic drive assembly (21), wherein the telescopic drive assembly (21) is used to drive the locking rod (22) to pass through the fixing hole (15) and the pin hole (42), and one end of the locking rod (22) extending out of the locking space (13) forms a limited position notch (221); An anti-exit mechanism (3) is arranged on the locking seat (1) and is used to extend into or exit the limiting notch (221).

2. The trolley locking device according to claim 1, characterized in that: The locking seat (1) and the telescopic drive assembly (21) are both located at the lower side of the lifting arm (5), and the locking seat (1) is provided with a guide space (14) and the locking space (13) in sequence from top to bottom, the telescopic end of the telescopic drive assembly (21) can be extended into or out of the guide space (14), and the telescopic end is connected to a connecting plate (23), the connecting plate (23) is located at the outer side of the locking seat (1) close to the telescopic drive assembly (21), and the locking rod (22) is provided on the connecting plate (23) and is located at the lower side of the telescopic drive assembly (21).

3. The trolley locking device according to claim 2, characterized in that: The telescopic end of the telescopic drive assembly (21) comprises a telescopic rod (212) which can be telescopically driven and a cylinder sleeve (213) which is sleeved on the outside of the telescopic rod (212) and connected to the telescopic rod (212); the cylinder sleeve (213) is used to be sleeved on the outside of a fixed cylinder (211) of the telescopic drive assembly (21) when the telescopic rod (212) is retracted, and the connecting plate (23) is arranged on the outside of the cylinder sleeve (213).

4. The trolley locking device according to claim 3, characterized in that: The trolley locking device also includes a guide sleeve (6) arranged in the guide space (14) and capable of being passed through by the cylinder sleeve (213); an end of the guide sleeve (6) disposed toward the connecting plate (23) is provided with an extension tube section extending out of the guide space (14); the extension tube section is used to allow the cylinder sleeve (213) to stay when the telescopic rod (212) is retracted.

5. The trolley locking device according to claim 3, characterized in that: The telescopic drive assembly (21) further comprises a mounting seat (214) fixed to the lower side of the lifting arm (5), and the mounting seat (214) can be articulated by the fixed cylinder (211).

6. The trolley locking device according to any one of claims 1 to 5, characterized in that: The limiting notch (221) is arranged in a ring shape along the circumference of the locking rod (22), the number of the anti-exit mechanisms (3) is two, and the two anti-exit mechanisms (3) are arranged opposite to each other with the fixing hole (15) spaced apart.

7. The trolley locking device according to any one of claims 1 to 5, characterized in that: The anti-exit mechanism (3) is configured as an electromagnetic lock, the lock head (31) of the electromagnetic lock can be elastically compressed, and the side of the lock head (31) facing the locking seat (1) is an inclined surface.

8. The trolley locking device according to any one of claims 1 to 5, characterized in that: The locking seat (1) comprises a seat body (11) and a positioning assembly (12), wherein the seat body (11) forms the locking space (13) and the fixing hole (15), and the positioning assembly (12) is arranged on the seat body (11) and is used to abut against the boom trolley (4).

9. The trolley locking device according to claim 8, characterized in that: The positioning assembly (12) comprises a reference block (121) and an adjusting bolt (122); the reference block (121) is arranged on the seat body (11); the adjusting bolt (122) is threadably inserted into the reference block (121); and one end of the adjusting bolt (122) away from the reference block (121) is used to abut against the boom trolley (4).

10. A flat-top boom tower crane, characterized in that: The flat-top luffing tower crane comprises a luffing trolley (4) which can move freely along a lifting arm (5) and a trolley locking device according to any one of claims 1 to 9, a buffer block (41) is provided on the side of the luffing trolley (4) facing the trolley locking device, and a pin shaft hole (42) is formed on the body of the luffing trolley (4) and passes through the lifting arm (5) in the width direction.

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