CN218539095U - Tower head and tower crane - Google Patents

Abstract

The utility model provides a tower head and tower crane. The tower head comprises a frame body, the bottom of the frame body is provided with a rotary connecting structure, and the rotary connecting structure is used for being connected with a rotary table of the tower crane; two ends of the frame body along the length direction are respectively provided with a group of connecting interfaces, and the two groups of connecting interfaces are respectively used for being connected with an external balance arm and an external crane arm of the tower crane; wherein, along the length direction, the minimum distance from at least one group of the connection interfaces to the rotary connection structure is greater than or equal to a first distance, and the first distance is the size of the rotary connection structure in the length direction; at least one set of connect the interface and include support portion and under bracing portion, follow length direction, the under bracing portion for go up the support portion keep away from gyration connection structure. The utility model discloses can compromise the segmentation hoist and mount demand and the performance demand of tower machine facial make-up.

Description

Tower head and tower crane

Technical Field

The utility model relates to a hoist technical field particularly, relates to a tower head and tower crane.

Background

The tower crane generally comprises a tower body, a tower head, a crane boom and a balance arm, wherein the tower head is arranged right above the tower body, the size of the bottom of the tower head is close to that of the tower body, the crane boom and the balance arm are respectively connected to two opposite sides of the tower head, and in the assembling process of the tower crane, other hoisting devices such as a truck crane are generally required to be utilized to hoist and assemble sections of the tower head, the crane boom and the balance arm in a segmented manner, so that the tower crane has higher advantages in the working condition of limited ground space.

However, in this arrangement, the boom and the balance arm both form a cantilever structure, and the cantilever structure allows the end portions of the boom or the balance arm far away from each other to droop, thereby affecting the performance of the tower crane upper assembly formed by connecting the tower head, the boom and the balance arm, such as the lifting height, the lifting weight and the safety performance; on the other hand, the workload of multiple hoisting and assembling is large, and the sagging amount may be increased by the error of multiple assembling, which further affects the loading performance of the tower crane.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving the problem of how to compromise the performance demand and the segmentation hoist and mount demand of tower machine facial make-up to a certain extent.

In order to solve the above problems at least to a certain extent, a first aspect of the present invention provides a tower head, comprising a frame body, wherein a rotary connection structure is arranged at the bottom of the frame body, and the rotary connection structure is used for being connected with a rotary table of a tower crane;

two ends of the frame body along the length direction are respectively provided with a group of connecting interfaces, and the two groups of connecting interfaces are respectively used for being connected with an external balance arm and an external crane arm of the tower crane;

the minimum distance from at least one group of the connection interfaces to the rotary connection structure along the length direction is greater than or equal to a first distance, and the first distance is the size of the rotary connection structure in the length direction;

at least one set of connect the interface and include support portion and under bracing portion, follow length direction, the under bracing portion for go up the support portion keep away from gyration connection structure.

Optionally, the upper supporting portion and the lower supporting portion each include a second connecting hole structure, and an axis of each of the second connecting hole structures is located in the same plane.

Optionally, the upper supporting portion includes a second connecting hole structure, the lower supporting portion includes a butt plate, the butt plate is formed with a butt inclined plane, along the length direction, the lower end of the butt inclined plane is kept away from for the upper end the rotation connecting structure is arranged, and the axis of the second connecting hole structure is located in the butt inclined plane or parallel to the butt inclined plane.

Optionally, the second connecting hole structure is formed on the ear plates which are arranged oppositely, the two sets of ear plates are respectively located at two ends of the frame body along the width direction, and the two ear plates which are located in the middle in the width direction are provided with the plug pin mechanism therebetween.

Optionally, the abutting plate is further provided with a positioning pin and a third connecting hole structure.

Optionally, the frame body comprises an upper chord, a lower chord and web members, and the upper chord and the lower chord are connected through the web members to form a frame structure; the rotary connecting structure is arranged on the lower chord, and the connecting interfaces are formed at two ends of the upper chord and the lower chord along the length direction.

Optionally, the lower chord comprises a first chord section and a second chord section, the first chord section being arranged corresponding to the swivel connection structure; the web members comprise first web members arranged corresponding to the first rod sections and second web members arranged corresponding to the second rod sections;

the cross-sectional area of the first web member is greater than the cross-sectional area of the second web member; and/or the cross-sectional area of the first pole segment is greater than the cross-sectional area of the second pole segment; and/or, the support body is provided with the reinforcing plate in one or more places, the reinforcing plate with at least part laminate in the mode of the lateral wall of two arbitrary in the upper chord member, lower chord member and web member with two arbitrary welded connection, wherein, first pole section department is provided with the reinforcing plate.

Optionally, the reinforcing plate is provided with an open groove corresponding to the upper chord, the lower chord or the web member to which it is connected.

Optionally, the total length of the frame body is greater than or equal to 0.8 times of a first length, and less than or equal to 2.5 times of a second length, wherein the first length is the smallest length of the lengths of the external balance arms and the external crane arms, and the second length is the largest length of the lengths of the external balance arms and the external crane arms.

A second aspect of the present invention provides a tower crane, comprising a tower head as described above in the first aspect.

For the correlation technique, the utility model discloses an among tower head and tower crane, support body accessible gyration connection structure is connected with the revolving platform of tower machine to the connection interface through support body length direction both ends is connected with external balance arm or external jib loading boom respectively, thereby satisfies the segmentation hoist and mount demand of tower machine facial make-up. In the length direction of following the support body, the minimum distance that at least a set of connection interface is to gyration connection structure is greater than or equal to first distance, the connection interface includes support portion and under bracing portion, the under bracing portion is kept away from gyration connection structure setting for last support portion, for example, the last support portion and the under bracing portion of the connection interface of first end are located on the same face, this kind of setting mode, make external balance arm and the connection interface connection back of this first end, the one end (being terminal) tilt up setting of keeping away from the support body on the external balance arm, thereby can utilize the terminal upwarp volume of external balance arm to supply because of hanging in midair the heavy terminal drooping volume that leads to of balanced weight or external balance arm dead weight at a certain degree, can avoid leading to the moment of gravity out of control because of the drooping volume is too big, can improve security and reliability. In addition, the first distance is the size of the rotary connection structure in the length direction, at the moment, the part of the frame body close to the connection interface can be located outside the rotary table, on one hand, a space in the length direction is provided so as to facilitate assembly of the external balance arm or the external crane boom, on the other hand, the part of the frame body with the first end located outside the rotary table and the external balance arm form the whole balance arm together, and/or the part of the frame body with the second end located outside the rotary table and the external crane boom form the whole crane boom together, that is, the frame body part corresponding to the minimum distance can actually play a role in forming the balance arm or the crane boom, so that the length requirement of the external balance arm or the external crane boom can be reduced, and even the requirement of the number of segments assembled on the whole tower crane can be reduced, and/or the hoisting difficulty of the whole tower crane can be reduced, and the hoisting efficiency can be improved to a certain extent during assembly. The utility model discloses a structural design to the tower head can compromise the segmentation hoist and mount demand and the performance demand of tower machine facial make-up, and the practicality is strong.

Drawings

Fig. 1 is a schematic structural view of a tower crane with a tower head according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a tower head in an embodiment of the present invention;

fig. 3 is a schematic axial view of a tower head according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a lower chord according to an embodiment of the present invention;

fig. 5 is another schematic structural diagram of the lower chord according to the embodiment of the present invention.

Description of reference numerals:

1-tower head; 11-a frame body; 111-upper chord; 112-lower chord; 1121-a first pole segment; 1122-a second pole segment; 113-web member; 1131-a first web member; 1132 — a second web member; 114-a reinforcement plate; 1141-an open slot; 12-a swivel connection; 121-a first connection hole structure; 13-a connection interface; 131-an upper support part; 1311-second connection hole structure; 1312-ear plate; 132-a lower support; 1321-abutting plate; 1322-locating pins; 1323-third connection hole structure; 14-a guardrail; 2-a turntable; 3-external connection of a balance arm; 4-external crane arm.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

In the description of the present specification, references to the description of the terms "an embodiment," "one embodiment," "some embodiments," "exemplary" and "one embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or embodiment is included in at least one embodiment or embodiment of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or implementation. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or implementations.

The terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

In the drawings, the Z-axis represents the vertical, i.e., up-down, position, and the positive direction of the Z-axis (i.e., the arrow of the Z-axis points) represents up, and the negative direction of the Z-axis (i.e., the direction opposite to the positive direction of the Z-axis) represents down; in the drawings, the X-axis represents a horizontal direction and is designated as a left-right position, and a positive direction of the X-axis (i.e., an arrow direction of the X-axis) represents a right side and a negative direction of the X-axis (i.e., a direction opposite to the positive direction of the X-axis) represents a left side; in the drawings, the Y-axis indicates the front-rear position, and the positive direction of the Y-axis (i.e., the arrow direction of the Y-axis) indicates the front side, and the negative direction of the Y-axis (i.e., the direction opposite to the positive direction of the Y-axis) indicates the rear side; it should also be noted that the foregoing Z-axis, Y-axis, and X-axis representations are merely intended to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a tower head 1, a rotary connection structure 12 is disposed at the bottom of a frame body 11, and the rotary connection structure 12 is used for connecting with a rotary table 2 of a tower crane;

two ends of the frame body 11 along the length direction are respectively provided with a group of connecting interfaces 13, and the two groups of connecting interfaces 13 are respectively used for being connected with an external balance arm 3 and an external crane arm 4 of the tower crane;

wherein, along the length direction, the minimum distance from at least one group of the connection interfaces 13 to the rotary connection structure 12 is greater than or equal to a first distance, and the first distance is the size of the rotary connection structure 12 in the length direction;

the at least one set of connection interfaces 13 includes an upper support 131 and a lower support 132, the lower support 132 being spaced apart from the pivotal connection 12 with respect to the upper support 131 in the length direction.

The frame body 11 is generally formed by assembling and welding a plurality of structural members, and the specific structural forms of the rotary connection structure 12 and the connection interface 13 are not limited, and thus, corresponding functions can be realized.

It should be understood that, when the swivel connection structure 12 includes a plurality of first connection hole structures 121, the distance between the connection interface 13 and the adjacent first connection hole structures 121 is the minimum distance L1, and the distance between the first connection hole structures 121 located at both ends is the first distance L2. At this time, the minimum distance L1 is greater than or equal to the first distance L2. That is, the length of the frame 11 is at least twice the first distance L2.

At this time, the axis of the first connection hole structure 121 is consistent with the up-down direction or the left-right direction, the first connection hole structure 121 and the rotary table 2 can be connected by a pin shaft, and the pin shaft is driven by the pin inserting and pulling mechanism to be inserted or pulled out.

Illustratively, the connection interface 13 at the first end (i.e., the front end) is adapted to connect with the circumscribing jib 3, and the connection interface 13 at the second end (the rear end) is adapted to connect with the circumscribing jib 4.

At this time, the minimum distance from the connection interface 13 of the first end to the swing connection structure 12 is greater than or equal to the first distance L2, and/or the minimum distance from the connection interface 13 of the second end (rear end) to the swing connection structure 12 is greater than or equal to the first distance L2.

As shown in fig. 1, it should be understood that the upper support part 131 and the lower support part 132 are used to form a support for the outer boom 3 or the outer boom 4 at different positions in the vertical direction, when the lower support part 132 of the connection interface 13 at the first end (i.e., the front end) is disposed away from the rotary connection structure 12 with respect to the upper support part 131, the outer boom 3 is entirely inclined with respect to the length direction of the frame body 11, in which case the length direction of the outer boom 3 forms a first angle β 1 with the horizontal direction, and when the lower support part 132 of the connection interface 13 at the second end (i.e., the rear end) is disposed away from the rotary connection structure 12 with respect to the upper support part 131, the outer boom 4 is entirely inclined with respect to the length direction of the frame body 11, in which case the length direction of the outer boom 4 forms a second angle β 2 with the horizontal direction, which will be exemplified later.

It should be noted that, in the present specification, the following description about "the length direction" refers to the length direction of the frame body 11 unless explicitly limited, and the following description is not repeated.

It should be understood that the circumscribed balance arm 3 and the circumscribed lift arm 4 may be provided in multiple segments as needed, and will not be described in detail herein.

Therefore, the utility model discloses an among tower head 1, 11 accessible gyration connection structure 12 of support body are connected with revolving platform 2 of tower machine to connect interface 13 through 11 length direction of support body both ends respectively with external balance arm 3 or external jib loading boom 4 and be connected, thereby satisfy the segmentation hoist and mount demand of tower machine facial make-up. Along the length direction of the frame body 11, the minimum distance from at least one group of the connection interfaces 13 to the rotary connection structure 12 is greater than or equal to a first distance, the connection interfaces 13 include an upper support part 131 and a lower support part 132, the lower support part 132 is disposed far away from the rotary connection structure 12 relative to the upper support part 131, for example, the upper support part 131 and the lower support part 132 of the connection interface 13 at the first end are located on the same plane, in this manner, after the external balance arm 3 is connected with the connection interface 13 at the first end, the length direction of the external balance arm 3 is a first included angle β 1 relative to the length direction of the frame body 11, specifically, one end (that is, the end) of the external balance arm 3 far away from the frame body 11 is disposed in an upward inclined manner, so that the upward tilting amount of the end of the external balance arm 3 can be utilized to supplement the sagging amount of the end caused by the suspended counterweight or the self weight of the external balance arm 3 to a certain extent, the loss of gravity moment due to an excessively large sagging amount can be avoided, and safety and reliability can be improved. In addition, the first distance is a size of the rotary connection structure 12 in the length direction, at this time, a portion of the frame body 11 close to the connection interface 13 may be located outside the rotary table 2, on one hand, a space in the length direction is provided to facilitate assembly of the external balance arm 3 or the external jib boom 4, and on the other hand, a portion of the frame body 11 located outside the rotary table 2 at the first end and the external balance arm 3 together form the whole balance arm, and/or a portion of the frame body 11 located outside the rotary table 2 at the second end and the external jib boom 4 together form the whole jib boom, that is, a portion of the frame body 11 corresponding to the minimum distance may actually function as a portion forming the balance arm or the jib boom, so that a length requirement of the external balance arm 3 or the external jib boom 4 may be reduced, and even a number requirement of segments installed on the whole tower crane may be reduced, thereby a number of hoisting times and/or a hoisting difficulty of the whole tower crane may be reduced, and hoisting efficiency may be improved to a certain extent during assembly. The utility model discloses a structural design to tower head 1 can compromise the segmentation hoist and mount demand and the performance demand of tower machine facial make-up, and the practicality is strong.

Alternatively, the upper support part 131 and the lower support part 132 each include a second connection hole structure 1311, and the axes of the second connection hole structures 1311 are located in the same plane (case one, this embodiment is not shown in the drawings).

It should be understood that, at this time, for the connection interface 13 at the first end, the included angle formed by the surface and the length direction of the frame body 11 is complementary to the first included angle β 1, that is, the included angle formed by the surface and the vertical direction is the first included angle β 1.

As shown in fig. 1 to 3, differently from the first case, optionally, the upper support part 131 includes a second connection hole structure 1311, the lower support part 132 includes an abutment plate 1321, the abutment plate 1321 is formed with an abutment slope, a lower end of the abutment slope is disposed away from the swing connection structure 12 with respect to an upper end in a length direction, and an axis of the second connection hole structure 1311 is located in the abutment slope (case two) or parallel to the abutment slope (case three).

Taking the connection interface 13 at the first end (front end) as an example, the upper end of the end portion of the external balance arm 3 is connected to the second connection hole structure 1311 through a pin, and the lower end of the end portion of the external balance arm 3 abuts against the abutting plate 1321, so that the other end of the external balance arm 3 is tilted upward.

In this case, the tilt angle of the outer boom 3 or the outer boom 4 can be easily controlled by the tilt angle of the abutment plate 1321.

As shown in fig. 3, in particular, the second connecting hole structure 1311 is formed on oppositely arranged ear plates 1312, two sets of ear plates 1312 are respectively located at two ends of the frame body 11 along the width direction, and a pin inserting and pulling mechanism is arranged between the two ear plates 1312 located at the middle in the width direction. The pin shaft of the pin inserting and pulling mechanism is used for being inserted into the second connecting hole structure 1311.

Taking the connection interface 13 at the first end (front end) as an example, the end of the external balance arm 3 is provided with a connection plate, which is inserted into the gap between the opposing ear plates 1312 and connected by a pin driven by the pin insertion and extraction mechanism.

Therefore, the tower crane is convenient to assemble and has a simple structure and strong practicability.

As shown in fig. 2 and 3, in the second or third case, further, a positioning pin 1322 and a third connection hole structure 1323 are provided in the abutment plate 1321.

Specifically, the positioning pin 1322 is used for being in insertion fit with a positioning hole at the end of the external balance arm 3 or the external jib boom 4 to realize relative position positioning, and then the connecting piece passes through the third connecting hole structure 1323 and is connected with the external balance arm 3 or the external jib boom 4 to realize relative position locking of the two.

Thus, the structural stability of the connection between the frame body 11 and the external balance arm 3 or the external crane arm 4 can be ensured.

As shown in fig. 2, optionally, the frame body 11 includes an upper chord 111, a lower chord 112 and a web member 113, the upper chord 111 and the lower chord 112 are connected by the web member 113 to form a frame structure; the swing connecting structure 12 is disposed on the lower chord 112, and the connecting interfaces 13 are formed at both ends of the upper chord 111 and the lower chord 112 along the length direction.

Specifically, the upper chord 111, the lower chord 112 and the web 113 are provided in plural numbers, and the web 113 may include plural members with plural inclination angles, for example, for the web 113 located between the upper chord 111 and the lower chord 112, the web may include a vertical bar vertically disposed, and may also include plural diagonal members with different inclination angles, of course, the inclination angles of some diagonal members may also be the same, and will not be described in detail here.

In the second case, the end of the upper chord 111 is provided with the second connection hole structure 1311, the end of the lower chord 112 is provided with the abutment plate 1321, and the end face of the abutment plate 1321 faces obliquely upward.

So, can compromise the structural stability demand and the demand that subtracts heavy of support body 11.

In the use, each connection interface 13 department, especially gyration connection structure 12 department can bear great effort on the tower head 1, the utility model discloses still further strengthen the local force stability of support body 11, promote tower head 1's performance through following one or more measure.

As shown in fig. 2 to 5, the lower chord 112 includes a first pole segment 1121 and a second pole segment 1122, the first pole segment 1121 being disposed corresponding to the swing connecting structure 12; the web member 113 includes a first web member 1131 disposed in correspondence with the first rod segment 1121 and a second web member 1132 disposed in correspondence with the second rod segment 1122.

That is, the portion of the lower chord 112 at the swing connection 12 is defined as a first chord segment 1121, the other portions are defined as a second chord segment 1122, and the portion corresponding to the first chord segment 1121, that is, the web 113 connected to the first chord segment 1121 is defined as a first web 1131, and the portion corresponding to the second chord segment 1122, that is, the web 113 connected to the second chord segment 1122 is defined as a second web 1132.

In some approaches, the cross-sectional area of the first web member 1131 is greater than the cross-sectional area of the second web member 1132.

In some aspects, the first rod segment 1121 has a cross-sectional area that is greater than the cross-sectional area of the second rod segment 1122.

By adopting the two modes, the frame body 11 can be reinforced at the position of the rotary connecting structure 12, particularly, the stress stability of the part, which is arranged on the rotary table 2, of the tower crane can be reinforced.

As shown in fig. 3 and 5, in some embodiments, the frame body 11 is provided with a reinforcing plate 114 at one or more positions, and the reinforcing plate 114 is welded to any two of the upper chord 111, the lower chord 112 and the web 113 in a manner of being at least partially attached to the side walls of any two of the two.

Illustratively, a reinforcing plate 114 is disposed at the first rod segment 1121.

Specifically, at this time, the reinforcing plate 114 is attached to the side walls of the second rod segment 1122 and the one or more first web members 1131, and is welded to the second rod segment 1122 and the one or more first web members 1131. The first rod segment 1121 may include a body portion that may conform to the cross-sectional shape of the first rod segment 1121, or may be provided only as an intermediate plate, and the reinforcing plate 114 may be provided as a bent plate, with the intermediate plate being provided inside the bent plate (see fig. 5). The stiffener plate 114 may be used to form a first connection aperture structure 121.

Illustratively, the reinforcing plate 114 is disposed at the joint of the upper chord 111 and the web member 113, and accordingly, the reinforcing plate 114 may be used to form the second connecting hole structure 1311, for example, the two reinforcing plates 114 are spaced apart and partially connected to the upper chord 111 and the web member 113, and in this case, the reinforcing plate 114 may be the above-mentioned ear plate 1312, which will not be described in detail herein.

Further, the reinforcing plate 114 is provided with an open groove 1141 corresponding to the connected upper chord 111, lower chord 112 or web member 113.

Taking the reinforcing plate 114 at the first rod segment 1121 as an example, the opening groove 1141 is disposed corresponding to the second rod segment 1122 and the first web member 1131, and the groove bottom of the opening groove 1141 disposed corresponding to the first web member 1131 should be spaced from the end of the first web member 1131, and the spacing may be greater than 5-30 mm, for example, greater than 20 mm.

Therefore, the length of the welding seam can be increased through the arrangement of the open groove 1141, and the deformation of the reinforcing plate 114 caused by welding stress can be reduced to a certain extent through the open groove 1141, so that the structural stability can be improved.

As shown in fig. 3, optionally, the tower head 1 further includes a guardrail 14, and guardrails 14 are disposed on two sides of the top of the frame body 11. Maintenance work can be conveniently carried out on the top of the frame body 11, and the safety is high.

It should be noted that the upper chord 111 and the lower chord 112 may be parallel to each other or may be inclined to each other, and in general, the length direction of the frame body 11 may be understood as the length direction of the lower chord 112, and will not be described in detail herein.

Optionally, the total length of the frame body 11 is greater than or equal to 0.8 times of a first length, which is the minimum length of the lengths of the circumscribed balance arms 3 and the circumscribed crane arms 4, and is less than or equal to 2.5 times of a second length, which is the maximum length of the lengths of the circumscribed balance arms 3 and the circumscribed crane arms 4.

For example, in this case, both ends of the frame body 11 except the portion corresponding to the rotary connection structure 12 are respectively used to form a boom and a balance arm, in this case, the minimum distance corresponding to both the connection interfaces 13 is smaller than or equal to the first length, and in this case, the total length of the frame body 11 is close to the upper limit value.

Preferably, at this time, the corresponding minimum distances between the two connection interfaces 13 are equal, and the rotary connection structure 12 is approximately located at the center of the frame body 11 along the length direction, so as to facilitate hoisting of the tower head 1.

As shown in fig. 1, another embodiment of the present invention provides a tower crane, which includes the tower head 1 of the above embodiment.

The tower crane comprises all the advantages of the tower head 1, which will not be described in detail herein.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.

Claims (10)

1. The tower head is characterized by comprising a frame body (11), wherein a rotary connecting structure (12) is arranged at the bottom of the frame body (11), and the rotary connecting structure (12) is used for being connected with a rotary table (2) of a tower crane;

two ends of the frame body (11) along the length direction are respectively provided with a group of connecting interfaces (13), and the two groups of connecting interfaces (13) are respectively used for being connected with an external balance arm (3) and an external crane arm (4) of the tower crane;

wherein, along the length direction, the minimum distance from at least one group of the connection interfaces (13) to the rotary connection structure (12) is greater than or equal to a first distance, and the first distance is the size of the rotary connection structure (12) in the length direction;

at least one set of the connection interfaces (13) comprises an upper support (131) and a lower support (132), the lower support (132) being distanced from the swivelling connection (12) with respect to the upper support (131) in the length direction.

2. The tower head according to claim 1, wherein the upper support (131) and the lower support (132) each comprise a second coupling hole structure (1311), the axes of the second coupling hole structures (1311) all lying in the same plane.

3. The tower head according to claim 1, wherein the upper support (131) comprises a second connection hole structure (1311), and the lower support (132) comprises an abutment plate (1321), the abutment plate (1321) being formed with an abutment slope, a lower end of which is arranged away from the swivel connection structure (12) with respect to an upper end along the length direction, and an axis of the second connection hole structure (1311) being located within or parallel to the abutment slope.

4. The tower head according to claim 2 or 3, wherein the second connecting hole structure (1311) is formed on oppositely arranged ear plates (1312), two sets of ear plates (1312) are respectively located at two ends of the frame body (11) in the width direction, and a plug-and-pull pin mechanism is arranged between the two ear plates (1312) located at the middle in the width direction.

5. The tower head according to claim 3, characterized in that the abutment plate (1321) is further provided with a positioning pin (1322) and a third connection hole structure (1323).

6. The tower head according to claim 1, wherein the frame body (11) comprises an upper chord (111), a lower chord (112) and web members (113), the upper chord (111) and the lower chord (112) being connected by the web members (113) and forming a frame structure; the rotary connecting structure (12) is arranged on the lower chord (112), and the connecting interfaces (13) are formed at two ends of the upper chord (111) and the lower chord (112) along the length direction.

7. The tower head of claim 6, wherein the lower chord (112) comprises a first pole segment (1121) and a second pole segment (1122), the first pole segment (1121) being disposed in correspondence with the swing connection structure (12); the web member (113) comprises a first web member (1131) disposed in correspondence with the first rod segment (1121) and a second web member (1132) disposed in correspondence with the second rod segment (1122);

the first web member (1131) has a cross-sectional area greater than a cross-sectional area of the second web member (1132); and/or the first rod segment (1121) has a cross-sectional area greater than the cross-sectional area of the second rod segment (1122); and/or, the frame body (11) is provided with a reinforcing plate (114) at one or more positions, the reinforcing plate (114) is welded and connected with any two of the upper chord (111), the lower chord (112) and the web member (113) in a manner of being at least partially attached to the side walls of the two, and the reinforcing plate (114) is arranged at the first rod section (1121).

8. The tower head according to claim 7, wherein the stiffening plate (114) is provided with an open slot (1141) in correspondence of the upper chord (111), the lower chord (112) or the web member (113) to which it is connected.

9. The tower head according to claim 1, wherein the total length of the frame body (11) is greater than or equal to 0.8 times a first length, which is the smallest of the lengths of each of the circumscribing balance arms (3) and each of the circumscribing crane arms (4), and less than or equal to 2.5 times a second length, which is the largest of the lengths of each of the circumscribing balance arms (3) and each of the circumscribing crane arms (4).

10. A tower crane comprising a tower head according to any one of claims 1 to 9.

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