Trolley suitable for flat arm mode and movable arm mode and tower crane

Abstract

The utility model relates to the technical field of engineering machinery, and discloses a trolley suitable for a flat arm mode and a movable arm mode and a tower crane. The trolley comprises a frame and a hoisting wheel assembly; the lifting wheel assembly comprises a lifting wheel frame, a first pulley, a second pulley and a third pulley, the lifting wheel frame is arranged on the frame, the first pulley, the second pulley and the third pulley are arranged on the lifting wheel frame at intervals in the linear direction, and the included angle formed by the connecting line direction of the first pulley, the second pulley and the third pulley and the length direction of the frame is an acute angle. The trolley can be suitable for the boom in a movable arm mode or a flat arm mode, the size of the trolley frame does not need to be increased, the size and the weight of the trolley can be kept unchanged, and therefore the suspended load performance of the boom is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of engineering machinery, and in particular to a trolley and a tower crane suitable for flat arm and movable arm modes. Background Art

[0002] With the development of the construction industry, the requirements for tower crane operating conditions are getting higher and higher. At present, conventional boom tower cranes do not have a trolley structure, and only flat-arm tower cranes can rely on a trolley for luffing operations. Flat-arm tower cranes require a large operating space and cannot operate in some locations with limited space. Such working conditions require boom tower cranes, but boom tower cranes have low luffing efficiency and high costs. They are only used in limited space conditions, and their scope of use is smaller than that of flat-arm tower cranes.

[0003] The fixed pulleys at both ends of the lifting wheel group in the traditional trolley are arranged horizontally with the same height. When directly applied to a boom tower crane with a boom mode, when the pitch angle of the boom is raised to the maximum, the projection distance between the two fixed pulleys on the horizontal plane is reduced. In this state, the rope running position of the lifting wire rope is prone to interfere with the positioning pulley, which may cause the hook to be unable to lift heavy objects in severe cases. To solve the above problem, the prior art usually increases the distance between the fixed pulleys at both ends of the lifting wheel group, which increases the size and weight of the entire trolley and affects the lifting performance of the boom. Utility Model Content

[0004] The purpose of the present application is to provide a trolley and a tower crane suitable for flat-arm and movable-arm modes, so as to solve the problem in the prior art that the trolley size and weight are increased because of its suitability for movable-arm tower cranes and flat-arm tower cranes.

[0005] To achieve the above objectives, in a first aspect, the present application provides a trolley suitable for flat arm and movable arm modes, comprising:

[0006] Frame; and

[0007] The lifting wheel assembly includes a lifting wheel frame, a first pulley, a second pulley and a third pulley, wherein the lifting wheel frame is arranged on the vehicle frame, and the first pulley, the second pulley and the third pulley are arranged on the lifting wheel frame at intervals in a straight line direction, and an angle formed by a connecting direction of the first pulley, the second pulley and the third pulley and a length direction of the vehicle frame is an acute angle.

[0008] As a further improvement of the above technical solution:

[0009] In a possible implementation manner, a connecting distance between the first pulley and the second pulley is greater than a connecting distance between the second pulley and the third pulley.

[0010] In a possible embodiment, the lifting wheel frame includes two load-bearing side plates arranged in opposition, the two load-bearing side plates are connected by reinforcing ribs, and a receiving space for accommodating the first pulley, the second pulley and the third pulley is formed between the two load-bearing side plates.

[0011] In a possible embodiment, both of the load-bearing side plates are further provided with a guide portion, the guide portion is located at the top of the load-bearing side plate on one side close to the third pulley, and a guide gap is formed between the guide portions of the two load-bearing side plates for the connecting ear plate on the arm tip end of the arm frame to enter and exit.

[0012] In a possible implementation manner, a guide pin member is further provided between the two load-bearing side plates, the guide pin member is arranged on the top of the two load-bearing side plates and is located above the third pulley, and a rope outlet space for allowing the steel wire rope to pass through is formed below the guide pin member;

[0013] The lifting wheel frame is also provided with a pin hole for cooperating with the connecting ear plate locking pin, and the pin hole penetrates the two load-bearing side plates and the guide pin member along the thickness direction of the lifting wheel frame.

[0014] In a possible implementation manner, a first rope stopper is further provided between the two load-bearing side plates. The first rope stopper is located above the first pulley and forms a rope passing space for the steel wire rope to pass through between the first rope stopper and the first pulley.

[0015] In a possible embodiment, the trolley suitable for the flat arm and movable arm modes also includes a guide connecting member, which is rotatably disposed on the axle of the second pulley and is used to abut and cooperate with a switching pulley assembly for switching the rope winding ratio.

[0016] In a possible implementation manner, the lifting wheel frame is further provided with a rotation-stopping clamp, and the rotation-stopping clamp is used to abut against the axle of the second pulley;

[0017] The anti-rotation clamp comprises a mounting portion, a bending portion and an anti-rotation portion connected as one body, the mounting portion is connected to the lifting wheel frame, and one end of the anti-rotation portion away from the bending portion abuts against the wheel axle of the second pulley;

[0018] Wherein, an avoidance gap is formed between the anti-rotation part and the lifting wheel frame to avoid the guide connecting member.

[0019] In a possible implementation, support columns are provided around the frame, heightened legs are provided at the bottom of the support columns, support pads are provided at the bottom of the heightened legs, and the surface area of ​​the support pads is greater than the cross-sectional area of ​​the heightened legs.

[0020] To achieve the above-mentioned purpose, in a second aspect, the present application further provides a tower crane, comprising a boom, a hook and the trolley applicable to the horizontal boom and movable arm modes as described in the first aspect above, wherein the trolley is movably arranged on the boom, and the hook is suspended below the trolley by a steel wire rope;

[0021] Wherein, the boom includes a flat arm mode and a movable arm mode.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present application provides a trolley and tower crane suitable for flat arm and boom modes, wherein the trolley suitable for flat arm and boom modes is arranged by arranging the first pulley, the second pulley and the third pulley in the lifting wheel assembly on the lifting wheel frame in a linear direction and at an acute angle to the length direction of the frame, that is, an inclined arrangement. In this way, without changing the original lifting assembly, when the pitch angle of the boom is raised to the maximum, the spacing between the first pulley and the third pulley is significantly increased compared with the spacing in the horizontal arrangement in the prior art, and the wire rope will not interfere with the frame when it is running. In this way, the trolley suitable for flat arm and boom modes provided by the present application can be applied to booms in boom mode or flat arm mode, and there is no need to increase the size of the frame, and the size and weight of the trolley can remain unchanged, thereby ensuring the lifting performance of the boom.

[0024] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present application. It should be understood that the following drawings only show certain embodiments of the present application and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work. In the drawings:

[0026] Figure 1 A three-dimensional structural schematic diagram of an assembly state of a boom and a trolley provided in an embodiment of the present application is shown;

[0027] Figure 2 A schematic diagram of the three-dimensional structure of a trolley provided in an embodiment of the present application is shown;

[0028] Figure 3 A schematic diagram of the matching structure of the trolley stop rotation clamp and the guide connecting member provided in an embodiment of the present application is shown;

[0029] Figure 4A schematic diagram of the local structure of the cooperation between the guide part and the connecting ear plate after the trolley moves to the arm tip in the embodiment of the present application is shown;

[0030] Figure 5 It shows a schematic diagram of the position structure of the anti-tilt angle steel and the anti-tilt ear plate after the connection ear plate on the trolley and the arm tip cooperates in the embodiment of the present application;

[0031] Figure 6 A front view showing the cooperation between the switching pulley assembly and the hook in the embodiment of the present application is shown;

[0032] Figure 7 Shows Figure 6 A side view of the switching pulley assembly shown in cooperation with the hook;

[0033] Figure 8 A schematic diagram of the structure of a trolley, a switching pulley assembly and a hook 4-fold rope winding in a flat arm mode provided in an embodiment of the present application is shown;

[0034] Fig. 9 A schematic diagram of the structure of a trolley, a switching pulley assembly and a hook double-rate rope winding in a flat arm mode provided in an embodiment of the present application is shown;

[0035] Fig.10 A schematic structural diagram of a trolley, a switching pulley assembly and a hook with a 4-fold rope winding when a boom mode provided by an embodiment of the present application and the pitch angle of the boom is maximum is shown.

[0036] Description of reference numerals:

[0037] 100, trolley; 110, frame; 111, support column; 112, heightening leg; 113, support pad; 114, crossbeam; 115, diagonal brace tube; 116, diagonal stay tube; 117, anti-tipping angle steel; 120, lifting wheel assembly; 121, lifting wheel frame; 1210, load-bearing side plate; 1211, reinforcing rib; 1212, guide part; 1213, guide pin; 1214, first rope stopper; 1215, second rope stopper; 1216, pin hole; 122, first pulley; 123, second pulley; 124, third pulley; 125, anti-rotation clamp; 1250, mounting part; 1251, bending part; 1252, anti-rotation part; 1253, avoidance gap; 130, guide connector; 131, guide gap;

[0038] 200, switching pulley assembly; 210, switching wheel frame; 220, hanging assembly; 230, pulley body; 240, fixing pin;

[0039] 300, hook; 310, connecting pin; 320, adjusting member;

[0040] 400, arm support; 410, arm tip; 411, connecting ear plate; 412, anti-tilt ear plate;

[0041] 500. Wire rope. DETAILED DESCRIPTION

[0042] The specific implementation of the embodiment of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present application, and is not used to limit the embodiment of the present application.

[0043] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with exemplary embodiments.

[0044] Example

[0045] See also Figure 1 and Figure 2 This embodiment provides a trolley 100 suitable for flat arm and movable arm modes, which can be used in a tower crane.

[0046] The tower crane includes a boom 400 and a hook 300, and the boom 400 includes a boom mode and a horizontal boom mode. The trolley 100 is movably arranged on the boom 400, and the hook 300 is suspended on the trolley 100 through a wire rope 500. When the boom 400 is in the horizontal boom mode, the trolley 100 can move along the boom 400 to change the amplitude; when the boom 400 is switched to the boom mode, the trolley 100 is locked and fixed at the arm tip 410 of the boom 400, and the trolley 100 can perform pitching motion with the boom 400.

[0047] The trolley 100 suitable for the flat arm and boom modes provided in this embodiment includes a frame 110, a lifting wheel assembly 120 and a guide connector 130. The lifting wheel assembly 120 includes a lifting wheel frame 121, a first pulley 122, a second pulley 123 and a third pulley 124. The lifting wheel frame 121 is arranged on the frame 110, and the first pulley 122, the second pulley 123 and the third pulley 124 are arranged on the lifting wheel frame 121 at intervals along a straight line direction, and the angle formed by the connecting direction of the first pulley 122, the second pulley 123 and the third pulley 124 and the length direction of the frame 110 is an acute angle. That is to say, the first pulley 122, the second pulley 123 and the third pulley 124 are located on the same straight line and are inclined at a certain angle. Among them, the length direction of the frame 110 is as shown in FIG. Figure 2 The direction indicated by the arrow L shown in FIG.

[0048] Please also read Figure 3The guide connector 130 is rotatably disposed on the axle of the second pulley 123, and is used to abut against and cooperate with the switch pulley assembly 200 for switching the rope winding ratio. The guide connector 130 is in an active state. When the boom 400 performs a pitching motion, the guide connector 130 is always in a vertical downward state under the action of its own gravity, so that when the hook 300 performs a ratio switching, the switch pulley assembly 200 can abut against and cooperate with the guide connector 130.

[0049] Optionally, the guide connecting member 130 is a guide plate, and one end of the guide plate away from the frame 110 is provided with a guide notch 131 for abutting and cooperating with the switching pulley assembly 200. The opening at the lower end of the guide notch 131 is in a trumpet shape, so that the fixing pin 240 (described below) in the switching pulley module 200 can enter the guide notch 131 for guidance.

[0050] It should be noted that after the trolley 100 is installed on the boom 400, the distance between the first pulley 122 and the boom 400 is smaller than the distance between the third pulley 124 and the boom 400, and the third pulley 124 is closer to the arm tip 410 of the boom 400 than the first pulley 122 and the second pulley 123, so that the connecting line of the first pulley 122, the second pulley 123 and the third pulley 124 is inclined toward the lower part of the arm tip 410. Therefore, the uneven arrangement of the first pulley 122, the second pulley 123 and the third pulley 124 can make the overall centering of the hook 300 better than the equal spacing arrangement.

[0051] Thus, the trolley 100 suitable for the horizontal arm and the movable arm mode provided in this embodiment is arranged on the lifting wheel frame 121 by linear spacing of the first pulley 122, the second pulley 123 and the third pulley 124 in the lifting wheel assembly 120 and arranged at an acute angle to the length direction of the frame 110, that is, an inclined arrangement is adopted. Therefore, without changing the original lifting assembly, when the pitch angle of the boom 400 is raised to the maximum, the spacing between the first pulley 122 and the third pulley 124 is significantly larger than the spacing in the horizontal arrangement in the prior art (see Figure 8 and Fig.10 ), the wire rope 500 will not interfere with the frame 110 when it is running. In this way, the trolley 100 suitable for the flat arm and boom mode provided in this embodiment can be suitable for the boom 400 in the boom mode or the flat arm mode, and there is no need to increase the size of the frame 110. The size and weight of the trolley 100 can remain unchanged, thereby ensuring the lifting performance of the boom 400.

[0052] Furthermore, the first pulley 122, the second pulley 123 and the third pulley 124 are arranged in a linear direction, which can facilitate the threading and winding of the wire rope 500. When winding the rope, there is no need to change the insertion direction to achieve fast winding. In this way, the winding of the tower crane trolley 100 is relatively cumbersome and the winding time can be greatly shortened. Furthermore, considering the force on the pulleys, the force on the first pulley 122, the second pulley 123 and the third pulley 124 is relatively uniform, and the loss to the pulleys and internal bearings is small;

[0053] In this embodiment, the distance between the first pulley 122 and the second pulley 123 is greater than the distance between the second pulley 123 and the third pulley 124. That is to say, the first pulley 122, the second pulley 123 and the third pulley 124 are arranged at non-equidistant intervals, and the second pulley 123 is closer to the third pulley 124, so that the vertical center line of the second pulley 123 is closer to the center of gravity of the hook 300. In this case, the hook 300 can be ensured to be in the center position when it is lifted to the top for changing the magnification, ensuring that the magnification switching is completed smoothly.

[0054] See also Figure 2 The lifting wheel frame 121 includes two load-bearing side plates 1210 arranged in opposite positions, and the two load-bearing side plates 1210 are connected by reinforcing ribs 1211. A receiving space for accommodating the first pulley 122, the second pulley 123 and the third pulley 124 is formed between the two load-bearing side plates 1210. The reinforcing ribs 1211 can enhance the structural strength of the lifting wheel frame 121.

[0055] Optionally, the two load-bearing side plates 1210 are connected to the vehicle frame 110 by welding.

[0056] Optionally, two load-bearing side panels are provided with a hollow hole area 1210 to reduce weight.

[0057] Please also read Figure 4 Furthermore, both load-bearing side plates 1210 are provided with guide parts 1212, which are located at the top of the side of the load-bearing side plates 1210 close to the third pulley 124, and a guide gap is formed between the guide parts 1212 of the two load-bearing side plates 1210 for the connecting ear plate 411 at the end of the arm tip 410 of the boom 400 to enter and exit. The guide gap formed by the lifting wheel frame 121 can play a guiding role when the trolley 100 moves to the arm tip 410 in the flat arm mode, so that when the trolley 100 moves to the end of the arm tip 410, the connecting ear plate 411 enters between the two load-bearing side plates 1210, and then is locked and fixed by a locking pin.

[0058] Optionally, the guide portion 1212 is formed by bending two load-bearing side plates 1210 inward or welding guide blocks.

[0059] A guide pin 1213 is also provided between the two load-bearing side plates 1210. The guide pin 1213 is arranged on the top of the two load-bearing side plates 1210 and is located above the third pulley 124. A rope outlet space for the wire rope 500 to pass through is formed below the guide pin 1213.

[0060] Furthermore, the lifting wheel frame 121 is also provided with a latch hole 1216 for cooperating with the locking pin of the connecting ear plate 411, and the latch hole 1216 penetrates the two load-bearing side plates 1210 and the guide pin 1213 along the thickness direction of the lifting wheel frame 121. In this way, the guide pin 1213 and the latch hole 1216 are arranged to overlap, thereby saving the installation space on the two load-bearing side plates 1210, making the lifting wheel assembly 120 more compact. In addition, the guide pin 1213 can also enhance the structural strength between the two load-bearing side plates 1210 at the latch hole 1216.

[0061] Optionally, the latch hole 1216 is a waist-shaped hole or an elliptical hole. The guide pin member 1213 is a tube member and the radial cross-sectional shape is adapted to the shape of the latch hole 1216, so that the locking pin is more convenient to insert than a round hole or a round tube.

[0062] Furthermore, a first rope stopper 1214 is provided between the two load-bearing side plates 1210. The first rope stopper 1214 is located above the first pulley 122 and forms a rope passage space for the steel wire rope 500 to pass through the first pulley 122. This is to prevent the steel wire rope 500 from slipping out of the first pulley 122. It is understandable that a second rope stopper 1215 may also be provided on the third pulley 124.

[0063] In this embodiment, the lifting wheel assembly 120 further includes a stopper 125, and at least one stopper 125 is also provided on the lifting wheel frame 121. The stopper 125 is used to abut against the axle of the second pulley 123 to limit the rotation of the axle of the second pulley 123. It can be understood that in this embodiment, the lifting wheel frame 121 has two load-bearing side plates 1210, and the axle of the second pulley 123 is installed on each load-bearing side plate 1210. In order to facilitate the disassembly and assembly of the second pulley 123, the axle of the second pulley 123 is detachably connected to the load-bearing side plate 1210, so that each load-bearing side plate 1210 is provided with a stopper 125 to limit the rotation of the axle of the second pulley 123 exposed outside the load-bearing side plate 1210.

[0064] See also Figure 2 and Figure 3Specifically, the anti-rotation clamp 125 includes a mounting portion 1250, a bending portion 1251 and an anti-rotation portion 1252 connected as one body, the mounting portion 1250 is connected to the lifting wheel frame 121, and one end of the anti-rotation portion 1252 away from the bending portion 1251 abuts against the axle of the second pulley 123. A clearance for avoiding the guide connecting member 130 is formed between the anti-rotation portion 1252 and the corresponding load-bearing side plate 1210 of the lifting wheel frame 121, and the clearance can prevent the anti-rotation clamp 125 from interfering with the movement of the guide connecting member 130.

[0065] Considering that the second pulley 123 needs to be disassembled, in this embodiment, the anti-rotation clamp 125 is connected to the load-bearing side plate 1210 by screws. Among them, the mounting portion 1250 is provided with a through hole for the screw to pass through, and the screw is threadedly engaged with the load-bearing side plate 1210 after passing through the through hole. The anti-rotation portion 1252 is provided with a corresponding avoidance notch 1253 corresponding to the through hole on the mounting portion 1250, so that the tool can screw the screw.

[0066] See also Figure 2 The frame 110 is provided with supporting columns 111 around it, the bottom of the supporting columns 111 is provided with heightening legs 112, the bottom of the heightening legs 112 is provided with supporting pads 113, and the surface area of ​​the supporting pads 113 is larger than the cross-sectional area of ​​the heightening legs 112.

[0067] In this embodiment, the heightened legs 112 are reinforced round tubes, which are used to reduce the structural weight of the frame 110 and facilitate lowering the trolley 100 to the ground without damaging the load-bearing side panels 1210 and related accessories on the frame 110.

[0068] Furthermore, the frame 110 is a rectangular parallelepiped frame structure as a whole, and support columns 111 are arranged at the four side edges. The support columns 111 are connected and fixed by a crossbeam 114. Among them, a diagonal brace tube 115 and a diagonal stay tube 116 are designed between the support column 111 and the crossbeam 114, and between the crossbeam 114 and the load-bearing side plate 1210 to enhance the structural strength of the frame 110. A triangular structure is formed between the support column 111, the crossbeam 114 and the diagonal brace tube 115, and a triangular structure is formed between the crossbeam 114, the load-bearing side plate 1210 and the diagonal stay tube 116.

[0069] See also Figure 1 , Figure 2 and Figure 5In some embodiments, the frame 110 of the trolley 100 is also designed with an anti-tilt angle steel 117. When the trolley 100 is fixed on the arm tip 410, the boom 400 can be switched to the boom mode for pitching operation. When the boom 400 is swung to the maximum angle, the trolley 100 will be at risk of falling out. In order to avoid this risk, two anti-tilt angle steels 117 are welded on the two columns in front of the trolley 100, and the corresponding arm tip 410 is also designed with an anti-tilt ear plate 412. The anti-tilt angle steel 117 and the anti-tilt ear plate 412 of the boom 400 can prevent the trolley 100 from falling out of the boom 400, thereby adding double insurance for the fixation of the trolley 100.

[0070] See also Figure 1 , Figure 2 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 The switching pulley assembly 200 is arranged between the hook 300 and the trolley 100 , and the switching pulley assembly 200 can be switched and connected with the trolley 100 or the hook 300 suspended below the trolley 100 .

[0071] In this embodiment, the first pulley 122 and the second pulley 123 adopt a double-row fixed pulley structure, that is, two fixed pulleys arranged in parallel and rotating independently. Therefore, the wire rope 500 passes through the first pulley 122 and passes through the second pulley 123, the switching pulley assembly 200, the second pulley 123, the third pulley 124 and the pulley module on the hook 300 in sequence, and finally passes out from the first pulley 122. In this rope winding method, the incoming rope and the outgoing rope of the switching pulley assembly 200 are both associated with the second pulley 123, the incoming rope of the pulley module on the hook 300 comes from the third pulley 124, and the outgoing rope is connected to the first pulley 122, so that the switching pulley assembly 200 and the hook 300 are better centered. As a result, the switching pulley assembly 200 automatically switches from the state connected to the hook 300 to the state connected to the trolley 100 more smoothly, thereby successfully completing the automatic ratio switching.

[0072] See also Figure 6 and Figure 7 Specifically, the switching pulley assembly 200 includes a switching wheel frame 210 and a hanging assembly 220. The switching wheel frame 210 is provided with a rotatable pulley body 230 and a fixing pin 240. The pulley body 230 is used to pass through and wind a steel wire rope 500. The fixing pin 240 is used to abut against and cooperate with the guide connecting member 130 on the trolley 100. The hanging assembly 220 is arranged on the switching wheel frame 210 and is located below the fixing pin 240. When the fixing pin 240 abuts against and cooperates with the connecting member, the steel wire rope 500 is used to drive the hook 300 to rise and engage or disengage with the hanging assembly 220.

[0073] Furthermore, the hanging assembly 220 has an extended state and a folded state; a connecting pin 310 and an adjusting member 320 are provided in sequence on the hook 300 along the vertical direction from top to bottom; wherein the connecting pin 310 can be snap-connected with the hanging assembly 220 when the hanging assembly 220 is in the folded state, and can be disengaged from the hanging assembly 220 when the hanging assembly 220 is in the extended state; under the drive of the wire rope 500, the adjusting member 320 can act on the hanging assembly 220 to keep the hanging assembly 220 in the extended state and disengaged from the connecting pin 310.

[0074] Please also read Figure 8 and Fig. 9 In order to more clearly describe the technical solution of this embodiment, the following will describe the rope winding rate switching of the pulley module of the trolley 100 and the hook 300, as follows:

[0075] In the initial state, the switching pulley assembly 200 and the guide connector 130 are separated, and the hanging assembly 220 of the switching pulley assembly 200 is connected to the hook 300, so that the switching pulley assembly 200 and the hook 300 are connected as a whole and are located below the pulley module of the trolley 100. At this time, the pulley module of the trolley 100 and the hook 300 are 4 times the rope winding rate.

[0076] (a) When it is necessary to switch from 4x rate roping to 2x rate roping;

[0077] In the first step, the steel wire rope 500 is retracted to drive the switching pulley assembly 200 and the hook 300 to lift the first preset stroke as a whole, so that the guide connector 130 abuts against the fixing pin 240 on the switching wheel frame 210;

[0078] In the second step, the hook 300 is driven to be lifted, so that the adjusting member 320 acts on the hanging assembly 220, and the hanging assembly 220 is switched to the unfolded state and maintained. At this time, since the hanging assembly 220 is in the unfolded state, the connecting hook pin 310 on the switching wheel frame 210 is automatically disengaged from the hanging assembly 220 in the unfolded state;

[0079] In the third step, the wire rope 500 is finally released, and the hook 300 can be separated from the switching pulley assembly 200, so that the 4-fold rate of rope winding is switched to the 2-fold rate of rope winding. At this time, the switching pulley assembly 200 remains in contact with the guide connector 130. At this time, since the switching pulley module 200 and the guide connector 130 are only in contact with each other (i.e., they are in contact without fixed connection), the switching pulley module 200 and the guide connector 130 can be automatically separated.

[0080] (b) When it is necessary to switch from 2x rate roping to 4x rate roping;

[0081] In the first step, the switching pulley assembly 200 is kept in contact with the connecting member, and the hook 300 is driven to lift the second preset stroke as a whole by retracting the wire rope 500, so that the connecting hanging pin 310 on the switching wheel frame 210 is in contact with the hanging assembly 220;

[0082] In the second step, the hook 300 is continuously lifted, and the connecting pin 310 acts on the hanging assembly 220 to unfold the hanging assembly 220, until the connecting pin 310 is lifted to a position where it engages with the hanging assembly 220, and the hanging assembly 220 automatically retracts (it can be driven to retract by a spring, a spring sheet or a torsion spring) and automatically engages with the connecting pin 310, so that the switching pulley assembly 200 and the hook 300 are connected as a whole again;

[0083] In the third step, the wire rope 500 is finally released, and the switching pulley assembly 200 and the hook 300 are lowered together, so as to switch the 2-fold rope winding rate to the 4-fold rope winding rate. At this time, the switching pulley assembly 200 is separated from the guide connector 130.

[0084] See also Figures 1 to 9 Furthermore, this embodiment also provides a tower crane. The tower crane includes a boom 400, a hook 300, and a trolley 100 suitable for a flat boom mode and a movable boom mode according to the first embodiment. The trolley 100 is movably arranged on the boom 400, and the hook 300 is suspended below the trolley 100 through a wire rope 500. The boom 400 includes a flat boom mode and a movable boom mode.

[0085] It can be understood that when the boom 400 is operating in the horizontal arm mode, the lower vehicle can move along the boom 400 to change the amplitude; when the boom 400 is switched to the movable arm mode, the trolley 100 is locked and fixed at the arm tip 410 of the boom 400, and the trolley 100 can perform pitch motion with the boom 400.

[0086] In the description of the present application, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0087] In this application, 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 connection; 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 this application can be understood according to specific circumstances.

[0088] 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 present application. 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.

[0089] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A trolley suitable for flat arm and movable arm modes, characterized in that: include: Frame (110); and The lifting wheel assembly (120) comprises a lifting wheel frame (121), a first pulley (122), a second pulley (123) and a third pulley (124); the lifting wheel frame (121) is arranged on the vehicle frame (110); the first pulley (122), the second pulley (123) and the third pulley (124) are arranged on the lifting wheel frame (121) at intervals along a straight line direction; and an angle formed by a connecting line direction of the first pulley (122), the second pulley (123) and the third pulley (124) and a length direction of the vehicle frame (110) is an acute angle.

2. The trolley suitable for flat arm and movable arm modes according to claim 1, characterized in that: The distance between the first pulley (122) and the second pulley (123) is greater than the distance between the second pulley (123) and the third pulley (124).

3. The trolley suitable for flat arm and movable arm modes according to claim 1, characterized in that: The lifting wheel frame (121) includes two load-bearing side plates (1210) arranged in opposition, the two load-bearing side plates (1210) are connected by reinforcing ribs (1211), and a receiving space for accommodating the first pulley (122), the second pulley (123) and the third pulley (124) is formed between the two load-bearing side plates (1210).

4. The trolley suitable for flat arm and movable arm modes according to claim 3, characterized in that: Both of the two load-bearing side plates (1210) are also provided with a guide portion (1212), and the guide portion (1212) is located at the top of the side of the load-bearing side plate (1210) close to the third pulley (124), and a guide gap is formed between the guide portions (1212) of the two load-bearing side plates (1210) for the connecting ear plate (411) at the end of the arm tip (410) of the arm frame (400) to enter and exit.

5. The trolley suitable for flat arm and movable arm modes according to claim 4, characterized in that: A guide pin member (1213) is also provided between the two load-bearing side plates (1210). The guide pin member (1213) is arranged on the top of the two load-bearing side plates (1210) and is located above the third pulley (124). A rope outlet space for allowing the steel wire rope (500) to pass through is formed below the guide pin member (1213); The lifting wheel frame (121) is also provided with a latch hole (1216) for cooperating with the locking pin of the connecting ear plate (411), and the latch hole (1216) penetrates the two load-bearing side plates (1210) and the guide pin member (1213) along the thickness direction of the lifting wheel frame (121).

6. The trolley suitable for flat arm and movable arm modes according to claim 3, characterized in that: A first rope stopper (1214) is also provided between the two load-bearing side plates (1210). The first rope stopper (1214) is located above the first pulley (122) and forms a rope passage space for the steel wire rope (500) to pass through between the first pulley (122).

7. The trolley suitable for flat arm and movable arm modes according to any one of claims 1 to 6, characterized in that: The trolley suitable for the flat arm and movable arm modes also includes a guide connecting member (130), which is rotatably arranged on the axle of the second pulley (123) and is used to abut and cooperate with the switching pulley assembly (200) for switching the rope winding ratio.

8. The trolley suitable for horizontal arm and movable arm modes according to claim 7, characterized in that: The lifting wheel frame (121) is also provided with a rotation-stopping clamp (125), and the rotation-stopping clamp (125) is used to abut against the axle of the second pulley (123); The anti-rotation clamp (125) comprises a mounting portion (1250), a bending portion (1251) and an anti-rotation portion (1252) which are connected as one body, the mounting portion (1250) is connected to the lifting wheel frame (121), and one end of the anti-rotation portion (1252) away from the bending portion (1251) is in contact with the wheel axle of the second pulley (123); Wherein, an avoidance gap is formed between the anti-rotation portion (1252) and the lifting wheel frame (121) to avoid the guide connecting member (130).

9. The trolley suitable for flat arm and movable arm modes according to claim 1, characterized in that: The frame (110) is provided with supporting columns (111) around its periphery, the bottom of the supporting columns (111) is provided with heightening legs (112), the bottom of the heightening legs (112) is provided with supporting pads (113), and the surface area of ​​the supporting pads (113) is greater than the cross-sectional area of ​​the heightening legs (112).

10. A tower crane, characterized in that: It comprises a boom (400), a hook (300) and a trolley (100) suitable for a flat boom mode and a movable boom mode according to any one of claims 1 to 9, wherein the trolley (100) is movably arranged on the boom (400), and the hook (300) is suspended below the trolley (100) through a steel wire rope (500); Wherein, the boom (400) includes a flat boom mode and a movable boom mode.

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