Tower crane counterweight self-unloading device

Abstract

The utility model discloses a self-discharging device for a balance weight of a tower crane. The self-discharging device comprises a supporting portal frame, a plurality of pulley fixing pieces, a pulley block and a hoisting mechanism, the supporting portal frame comprises two single-frame supporting frames, a connecting cross beam used for connecting the two single-frame supporting frames, a reinforcing rod and a pulley mounting beam. Compared with the conventional balancing weight unloading supporting structure, the balancing weight unloading supporting structure has the advantages that the stability of the whole structure is obviously enhanced, the lowest connecting strength which must be reached between the supporting portal frame and the balance arm is reduced, the balance arm is not easy to damage when the heavy-weight balancing weight is unloaded, and the safety coefficient is improved. And the pulley block formed by combining the fixed pulley and the movable pulley is used for bearing the balancing weight, so that the load borne by the pulley rope and the hoisting mechanism is reduced, the maximum weight of the detachable balancing weight is increased, and the safety margin is increased. According to the utility model, the problems that the tower crane is easy to shake and the safety coefficient is relatively low in the large counterweight hoisting process are solved.

Description

Technical Field

[0001] The utility model relates to the field of building construction, in particular to a tower crane counterweight self-unloading device. Background Art

[0002] Tower cranes, also known as tower cranes, are used to lift various building materials or heavy objects on construction sites. The horizontal arm of a tower crane is mainly divided into two parts: the lifting arm and the balance arm, which are located on the left and right sides of the tower body respectively. The lifting arm is used to lift heavy objects, while the balance arm is used to keep the lifting arm balanced during the lifting process. Therefore, several counterweights need to be installed on the balance arm to maintain balance with the lifting arm.

[0003] After the lifting is completed, the counterweight needs to be removed. The common practice in the industry is to use a truck crane to remove the counterweight, which is troublesome and requires an independent truck crane, which is relatively expensive. There are also solutions in the prior art that provide a disassembly device on the balance arm, such as the Chinese utility model with announcement number CN214828576U - a tower crane counterweight self-unloading device, which lifts the counterweight through a winch and a fixed pulley transmission. After lifting, the counterweight is pushed horizontally to leave the tower crane range, and the winch rotates in the opposite direction to place the counterweight on the ground. The fixed pulley is installed on a support structure composed of two vertical support rods and a cross bar. However, in the face of heavy counterweights, the overall stability of the above-mentioned supporting gantry is insufficient, which requires that the support rod and the balance arm must have a high connection strength, so the balance arm is easily damaged when the heavy weight is unloaded; at the same time, due to the use of a fixed pulley transmission, the force on the hoisting mechanism such as the winch and wire rope is equal to the weight of the counterweight, and it is easy to be damaged under heavy loads. More importantly, the maximum weight of the removable counterweight is relatively small, which is also not suitable for working conditions with heavy counterweights. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a tower crane counterweight self-unloading device, which can solve the problem that the existing tower crane counterweight disassembly device is not conducive to disassembling heavy counterweight blocks.

[0005] The utility model is realized by the following technical solutions:

[0006] A tower crane counterweight self-unloading device is applied to a tower crane, the tower crane includes a lifting arm and a balance arm, including: a supporting gantry, including: two single-frame supporting frames, a connecting beam for connecting the two single-frame supporting frames, a reinforcing rod and a pulley mounting beam; the four corners of the two single-frame supporting frames are fixed by the connecting beam; the reinforcing rod is inclined, and the two ends are respectively fixed to the same side of the two single-frame supporting frames; the pulley mounting beam is erected and fixed on two connecting beams located at the top; a plurality of pulley fixings are arranged at intervals on the pulley mounting beam; a pulley block includes a movable pulley and a fixed pulley around which a pulley rope is wound; the fixed pulley is fixedly arranged on the pulley fixing, and a hoisting piece for fixing a counterweight block is also fixed on the movable pulley; a lifting mechanism is arranged on the balance arm, one end of the pulley rope is fixed to the supporting gantry, and the other end is fixed to the lifting mechanism; the supporting gantry is fixedly connected to the balance arm.

[0007] Furthermore, the single-frame support frame includes: two columns, a cross bar and two oblique bars; the two ends of the cross bar are respectively fixed to the top ends of the two columns; the oblique bar is inclined, and its two ends are respectively fixed to the columns and the cross bar to form a single-frame support frame structure.

[0008] Furthermore, the pulley fixing member is a concave fixing plate, and the concave fixing plate is provided with a groove structure suitable for installing the fixed pulley.

[0009] Furthermore, the pulley mounting beam comprises: two channel steels and a plurality of connecting plates; the two channel steels are arranged opposite to each other to jointly form a recess for accommodating the concave fixing plate; the connecting plate is simultaneously fixed to the two channel steels to fixedly connect to form the pulley mounting beam.

[0010] Furthermore, the supporting gantry also includes: a reinforcing plate; the reinforcing plate is fixed to the top of the column.

[0011] Furthermore, the tower crane counterweight self-unloading device also includes: a clamp fixing structure; the clamp fixing structure includes: two fixing plates, high-strength bolts and high-strength nuts; the two fixing plates are respectively arranged on the connecting beam at the bottom of the supporting gantry and the bottom of the balance arm, and are fixed by two high-strength bolts to ensure that the supporting gantry and the balance arm are firmly connected.

[0012] Furthermore, the number of the clamp fixing structures is four, and they are arranged at the four corners of the bottom of the supporting gantry to stably connect the supporting gantry to the balancing arm.

[0013] Furthermore, the lifting mechanism is a winch, and the winch is fixedly connected to the balance arm.

[0014] Furthermore, the pulley block includes: a movable pulley and two fixed pulleys; the two fixed pulleys are both arranged on the pulley fixing member to be arranged in parallel, and the fixed pulley and the movable pulley are respectively arranged on a side close to the lifting mechanism and a side away from the lifting mechanism.

[0015] Furthermore, the hanging member on the movable pulley is a hook member, and a matching hanging hole is provided on the top of the counterweight block.

[0016] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0017] Different from the previous counterweight unloading support structure, the utility model adopts a four-legged support gantry formed by connecting two single-frame support frames through a connecting beam and a reinforcing rod. The overall structural stability is significantly enhanced, and the minimum connection strength that must be achieved between the support gantry and the balance arm is reduced. When facing the unloading of a heavy counterweight, it is not easy to damage the balance arm, which improves the safety factor. In addition, a pulley mounting beam is set on the support gantry, and the counterweight is carried by a pulley group composed of a fixed pulley and a movable pulley, which reduces the load on the pulley rope and the lifting mechanism, increases the maximum weight of the unloadable counterweight, and increases the safety margin.

[0018] The utility model has the advantages of simple structure, easy installation, convenient maintenance and replacement, and solves the problems of unstable shaking and relatively low safety factor during the hoisting of large counterweights by tower cranes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is a schematic diagram of the overall hoisting of the utility model;

[0020] Figure 2 Shown is an elevation view of the supporting gantry;

[0021] Figure 3 Shown is a side view of the supporting gantry;

[0022] Figure 4 Shown is a top view of the supporting gantry;

[0023] Figure 5 Shown is a schematic diagram of the connection between the clamp fixing structure and the supporting gantry.

[0024] In the figure: 10, supporting gantry; 11, single-frame supporting frame; 111, column; 112, cross bar; 113, oblique bar; 12, connecting cross beam; 13, reinforcing rod; 14, pulley mounting beam; 141, channel steel; 142, connecting plate; 15, reinforcing plate; 20, pulley fixing part; 30, pulley rope; 40, movable pulley; 50, fixed pulley; 60, lifting mechanism; 70, clamp fixing structure; 71, fixing plate; 72, high-strength bolt; 73, high-strength nut; 80, lifting part; 90, balance arm; 100, counterweight. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0026] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, 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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; 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. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] The utility model discloses a tower crane counterweight self-unloading device, which is applied to a tower crane. Those skilled in the art may know that the tower crane comprises a lifting arm and a counterweight arm 90 which are arranged opposite to a tower body.

[0030] See also Figure 1-Figure 4 The tower crane counterweight self-unloading device includes: a supporting gantry 10, a plurality of pulley fixing parts 20, a pulley block and a lifting mechanism 60. The supporting gantry 10 includes: two single-frame supporting frames 11, a connecting beam 12 for connecting the two single-frame supporting frames 11, a reinforcing rod 13 for reinforcing the stability of the supporting gantry 10, and a pulley mounting beam 14 for installing a set pulley 50; the four corners of the two single-frame supporting frames 11 are fixed by a connecting beam 12 respectively; the reinforcing rod 13 is tilted, and its two ends are fixed on the same side of the two single-frame supporting frames 11 respectively. The pulley mounting beam 14 is erected and fixed on the two connecting beams 12 located at the top of the supporting gantry 10. Several pulley fixings 20 are arranged at intervals on the pulley mounting beam 14 for mounting fixed pulleys 50. Since the number of counterweights 100 is usually multiple and arranged horizontally, the fixed pulleys 50 are mounted on pulley fixings 20 at different horizontal positions corresponding to the counterweights 100 at different horizontal positions. The pulley block includes a movable pulley 40 and a fixed pulley 50 wound by a pulley rope 30, wherein the fixed pulley 50 is fixedly arranged on the pulley fixing 20, and a lifting member 80 for fixing and lifting the counterweight 100 is also fixed on the movable pulley 40. The lifting mechanism 60 is used as a rotating power source for tensioning the driving pulley rope 30, which is arranged on the balance arm 90, one end of the pulley rope 30 is fixed to the supporting gantry 10, and the other end is fixed to the lifting mechanism 60. The supporting gantry 10 is fixedly connected to the balance arm 90 as a whole, and the material is preferably a steel structure.

[0031] The working principle of the utility model is:

[0032] When removing the counterweight 100, the fixed pulley 50 is installed on the pulley fixing member 20 at the corresponding position, the lifting mechanism 60 is activated, the pulley rope 30 starts to run, and the counterweight 100 is lifted by the fixed pulley 50 and the movable pulley 40 in sequence. Then, after the counterweight 100 is pushed away from the horizontal range of the balance arm 90, the lifting mechanism 60 is driven in reverse to remove the counterweight 100. From left to right, each time a counterweight 100 is removed, the operator moves the fixed pulley 50 to the adjacent pulley fixing member 20, and then repeats the above steps to remove all the counterweights 100 in sequence.

[0033] Different from the previous counterweight unloading support structure, the utility model adopts a four-legged support gantry 10 formed by connecting two single-frame support frames 11 through a connecting beam 12 and a reinforcing rod 13, which significantly enhances the overall structural stability, reduces the minimum connection strength that must be achieved between the support gantry 10 and the balance arm 90, and is not easy to damage the balance arm 90 when facing the unloading of a heavy counterweight block 100, thereby improving the safety factor. In addition, a pulley mounting beam 14 is provided on the support gantry 10, and the counterweight block 100 is carried by a pulley group composed of a fixed pulley 50 and a movable pulley 40, which reduces the load on the pulley rope 30 and the lifting mechanism 60, increases the maximum weight of the unloadable counterweight, and increases the safety margin.

[0034] The utility model has the advantages of simple structure, easy installation, convenient maintenance and replacement, and solves the problems of unstable shaking and relatively low safety factor during the hoisting of large counterweights by tower cranes.

[0035] See also Figure 2 The specific structure of the single-frame support frame 11 includes: two columns 111, a crossbar 112 and two oblique rods 113. The two ends of the crossbar 112 are respectively fixed to the tops of the two columns 111; the oblique rod 113 is inclined, and its two ends are respectively fixed to the columns 111 and the crossbar 112 to form the structure of the single-frame support frame 11.

[0036] Preferably, see Figure 2 The pulley fixing member 20 is a concave fixing plate 71, and a groove structure suitable for installing the fixed pulley 50 is formed on the concave fixing plate 71. Further, the pulley mounting beam 14 includes two channel steels 141 and a plurality of connecting plates 142. The openings of the two channel steels 141 face outwards and are arranged opposite to each other, and together form a recess for accommodating the concave fixing plate 71. The connecting plate 142 is used to fix the two channel steels 141, thereby connecting to form the pulley mounting beam 14.

[0037] Preferably, the supporting gantry 10 further includes a reinforcing plate 15 , which is fixed on the top of the column 111 .

[0038] The specific connection between the supporting gantry 10 and the balancing arm 90 is as follows. Figure 5The utility model also includes a clamp fixing structure 70; the clamp fixing structure 70 specifically includes: two fixing plates 71, high-strength bolts 72 and matching high-strength nuts 73. The two fixing plates 71 are respectively arranged on the two connecting beams 12 at the bottom of the supporting gantry 10 and the bottom of the balance arm 90, and are fixed by two high-strength bolts 72, so that a stable connection is achieved between the supporting gantry 10 and the balance arm 90. The advantage of this embodiment is that it is different from the previous welding fixing method, improves the connection stability of the supporting mechanism, and can effectively protect the gantry arm. Even when the hoisting weight is too high or the service life is reached, the damaged part is only the clamp fixing structure 70, and the boom itself will not be directly damaged, which is convenient for maintenance and replacement.

[0039] Preferably, the number of the clamp fixing structures 70 is set to four, which are respectively arranged at the four corners of the bottom of the supporting gantry, so as to stably connect the supporting gantry 10 to the balance arm 90.

[0040] Preferably, the lifting mechanism 60 is a winch, which is fixedly connected to the balance arm 90 .

[0041] Preferably, in one embodiment, see Figure 1 The pulley block is a combination of a movable pulley 40 and two fixed pulleys 50. The two fixed pulleys 50 are arranged on the pulley fixing member 20 in parallel, so that the pulley rope 30 is parallel to the pulley fixing beam relative to the front end of the winch to avoid interference. The fixed pulley 50 and the movable pulley 40 are respectively arranged on a side close to the lifting mechanism 60 and a side away from the lifting mechanism 60.

[0042] Preferably, the hanging member 80 on the movable pulley 40 is a hook member, and a matching hanging hole is provided on the top of the counterweight block 100 so that the hook member can hook the counterweight block 100 .

[0043] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A tower crane counterweight self-unloading device, applied to a tower crane, wherein the tower crane comprises a lifting arm and a counterweight arm, It is characterized in that include: The supporting gantry comprises: two single-frame supporting frames, a connecting beam for connecting the two single-frame supporting frames, a reinforcing rod and a pulley mounting beam; The four corners of the two single-frame support frames are fixed by connecting beams; the reinforcing rod is tilted, and the two ends are respectively fixed to the same side of the two single-frame support frames; the pulley mounting beam is erected and fixed on the two connecting beams located at the top; A plurality of pulley fixing members are arranged at intervals on the pulley mounting beam; The pulley block comprises a movable pulley and a fixed pulley around which a pulley rope is wound; the fixed pulley is fixedly arranged on the pulley fixing member, and a hanging member for fixing a counterweight block is also fixed on the movable pulley; A lifting mechanism is arranged on the balance arm, one end of the pulley rope is fixed to the supporting gantry, and the other end is fixed to the lifting mechanism; The supporting gantry is fixedly connected to the balancing arm.

2. The tower crane counterweight self-unloading device according to claim 1, It is characterized in that The single-frame support frame includes: two columns, a cross bar and two oblique bars; the two ends of the cross bar are respectively fixed to the top ends of the two columns; the oblique bar is inclined, and its two ends are respectively fixed to the columns and the cross bar to form a single-frame support frame structure.

3. The tower crane counterweight self-unloading device according to claim 1, It is characterized in that The pulley fixing member is a concave fixing plate, and a groove structure suitable for installing the fixed pulley is formed on the concave fixing plate.

4. The tower crane counterweight self-unloading device according to claim 3, It is characterized in that The pulley mounting beam comprises: two channel steels and a plurality of connecting plates; the two channel steels are arranged opposite to each other to form a recess for accommodating the concave fixing plate; the connecting plates are fixed to the two channel steels at the same time to fix and connect them into the pulley mounting beam.

5. The tower crane counterweight self-unloading device according to claim 2, It is characterized in that The supporting gantry also includes: a reinforcing plate; the reinforcing plate is fixed to the top of the column.

6. The tower crane counterweight self-unloading device according to claim 1, It is characterized in that The tower crane counterweight self-unloading device also includes: a clamp fixing structure; the clamp fixing structure includes: two fixing plates, high-strength bolts and high-strength nuts; the two fixing plates are respectively arranged on the connecting beam at the bottom of the supporting gantry and the bottom of the balancing arm, and are fixed by two high-strength bolts to ensure that the supporting gantry is firmly connected to the balancing arm.

7. The tower crane counterweight self-unloading device according to claim 6, It is characterized in that There are four clamp fixing structures, which are respectively arranged at the four corners of the bottom of the supporting gantry to stably connect the supporting gantry to the balancing arm.

8. The tower crane counterweight self-unloading device according to claim 1, It is characterized in that The lifting mechanism is a winch, and the winch is fixedly connected to the balance arm.

9. The tower crane counterweight self-unloading device according to claim 1, It is characterized in that The pulley block comprises: a movable pulley and two fixed pulleys; the two fixed pulleys are arranged on the pulley fixing member in parallel, and the fixed pulley and the movable pulley are respectively arranged on a side close to the lifting mechanism and a side far away from the lifting mechanism.

10. The tower crane counterweight self-unloading device according to claim 1, It is characterized in that The hanging piece on the movable pulley is a hook piece, and a matching hanging hole is arranged on the top of the counterweight block.

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