Suspension type trolley with downward rotation function for bridge crane

Abstract

The invention relates to the technical field of crane trolleys, in particular to a suspension type trolley with a downward rotation function for a bridge crane, which comprises a running mechanism, the running mechanism comprises a rectangular frame body and two rigid cylindrical chains which are respectively mounted on two cross beams of a crane cart, a rolling wheel which is downwards rolled on a track is arranged at each corner end part of the rectangular frame body, and the rolling wheels are arranged on the rectangular frame body; an operation driving structure matched with the two rigid cylindrical chains is arranged in the middle of the rigid cylindrical chain; the running mechanism is driven in the mode that the rigid cylindrical chain is matched with the positive chain wheel, the rotating function is achieved in the mode that the conical chain wheel is matched with the rigid conical chain ring, and the running distance difference caused by the inner diameter and the outer diameter in the rotating process is effectively compensated through matching of the conical chain wheel and the rigid conical chain ring; and the high precision and the synchronism of the two sides of the running mechanism in the moving process are ensured. Compared with a traditional mode that the sports car wheels directly roll on a track or are meshed with a gear and a rack, abrasion can be effectively reduced, and the service life of high-precision operation is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of crane trolleys, and more particularly to a suspended trolley for a bridge crane with a lower rotation function. Background Art

[0002] In recent years, with the upgrading and iteration of equipment and the automation requirements of the use site, customers have higher and higher requirements for the accuracy of cranes during use, and the operating limit positions are getting larger and larger (that is, getting closer and closer to the workshop wall). In particular, there are requirements for the operation and rotation accuracy, horizontal size (the smaller the better), vertical size (the lower the height the better), and double-point lifting synchronization of crane trolleys.

[0003] Existing crane trolleys with a rotation function can generally be divided into three types: The first is the rotating hook method, which realizes the rotation of the lifted object through the rotation function of the hook. Although this method has a low cost, it has the defects of low efficiency, poor stability and accuracy; The second is the upper-rotating trolley, that is, the rotating mechanism is arranged above the running mechanism. This method has high stability and efficiency, but has a large cost and increases the height above the crane girder, and cannot meet the needs of customers with high upper limit requirements; The third is the lower-rotating trolley. For example, a lower-rotating electromagnetic bridge crane disclosed in a Chinese patent with the publication number CN110304545B. The rotating mechanism includes an upper housing and a lower housing, a middle rod rotatably connected to the lower housing, a transmission wheel connected to the outside of the middle rod by meshing a gear with an external gear ring, and a driving motor for driving the transmission wheel to rotate. Although it has high stability and efficiency, it has the defects of a large horizontal size cost and a large cost of the rotating mechanism.

[0004] Therefore, we have designed a suspended trolley for a bridge crane with a lower rotation function. Summary of the Invention

[0005] In order to overcome the deficiencies in the background art, the present invention discloses a suspended trolley for a bridge crane with a lower rotation function.

[0006] To achieve the above invention purpose, the present invention adopts the following technical solutions: A suspended trolley for a bridge crane with a lower rotation function, comprising: A running mechanism, including a rectangular frame body and two rigid cylindrical chains respectively installed on two crossbeams of a crane girder. Each corner end of the rectangular frame body is provided with a rolling wheel that rolls downward on the track, and a running driving structure that cooperates with both rigid cylindrical chains is provided in the middle; The rotating mechanism is installed below the rectangular frame body and includes a fixed ring, a rigid conical chain ring, and a rotation driving structure. The rotation driving structure cooperates with the rigid conical chain ring through two symmetric conical sprockets to achieve the rotation function; The lifting mechanism is installed below the rotating mechanism and includes a bracket. A lifting driving structure and two drums are arranged inside the bracket. The two drums are synchronously driven by the lifting driving structure to pay out or wind up their respective steel wire ropes, completing the lifting and lowering operations of the lifted object.

[0007] Preferably, the running driving structure includes a running motor, a running brake, and a running speed reducer with two output shafts having the same steering and rotation speed. The two output shafts of the running speed reducer are both connected with positive sprockets through rotating shafts, and cooperate with a rigid cylindrical chain to achieve the moving function.

[0008] Preferably, the rigid cylindrical chain includes two straight support plates arranged at intervals. A plurality of first fixing pins are installed between the two straight support plates along their length direction, and cylindrical sleeves are sleeved on the first fixing pins to reduce wear and improve the service life.

[0009] Preferably, the rotation driving structure includes a rotation motor, a rotation brake, and a commutator with two coaxial output shafts. The two output shafts of the commutator are connected with conical sprockets through rotating shafts, and cooperate with the rigid conical chain ring to achieve the rotation function.

[0010] Preferably, the bottom cross-section of the fixed ring is an inverted T shape; the rotating mechanism further includes two arc-shaped mounting seats symmetrically arranged on both sides of the fixed ring. Both sides of the top of the arc-shaped mounting seat are respectively provided with a downward pressing wheel that rolls on the top surface of the lower edge part of the fixed ring and a side pressing wheel that rolls on the side wall surface of the lower edge part of the fixed ring.

[0011] Preferably, the rigid conical chain ring includes two concentric annular support plates. Second fixing pins arranged radially are installed between the two annular support plates along the axial direction, and conical sleeves are sleeved on the second fixing pins to reduce wear and improve the service life.

[0012] Preferably, the taper of the conical sleeve is 1.3 degrees.

[0013] Preferably, both ends of the steel wire rope are respectively wound and fixed at both ends of the corresponding drum, and the middle part extends out, bypasses the movable pulley block on the lifting appliance, and then bypasses the fixed pulley block at the bottom of the bracket.

[0014] Preferably, the rotation driving structure is correspondingly located inside the fixed ring.

[0015] Preferably, a laser rangefinder is arranged in the middle of the rectangular frame body, which is used to measure data in real time and adjust the running driving structure to further improve the running accuracy; The top surface of the lifting mechanism is provided with a planar rotation angle sensor for real-time monitoring of the rotation angle and adjusting the rotation drive structure according to the monitoring results to ensure the accuracy of the rotation angle.

[0016] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects: 1. By adopting the cooperation mode of a rigid cylindrical chain and a positive sprocket to drive the running mechanism, and adopting the cooperation mode of a conical sprocket and a rigid conical chain ring to achieve the rotation function, the cooperation of the conical sprocket and the rigid conical chain ring effectively compensates for the running distance difference caused by the inner and outer diameters during the rotation process, ensuring the high precision and synchronization on both sides of the running mechanism during the movement. Compared with the traditional way of the running wheel directly rolling on the track, it can effectively prevent the wheel from slipping on the mating plane and improve the running control accuracy; compared with the meshing mode of the gear and the rack, it can effectively reduce wear and extend the service life of high-precision operation. 2. A cavity is designed inside the fixed ring to accommodate the rotation motor, the rotation brake and the commutator, which greatly reduces the height of the entire rotation mechanism and further reduces the overall vertical dimension.

[0017] 3. The rotation mechanism adopts the cooperation mode of a conical sprocket and a rigid conical chain ring to achieve the rotation function, and at the same time is equipped with vertical and lateral rolling wheels to ensure the stable rotation of the fixed ring, enhancing the stability and working efficiency of the rotation mechanism, reducing wear and increasing the service life.

[0018] 4. The first fixing pin and the second fixing pin are respectively sleeved with a cylindrical sleeve and a conical sleeve, which not only reduces the wear between the positive sprocket and the conical sprocket, but also can replace only part of the kits after wear, reducing the maintenance cost. In addition, the design of using a 90-degree commutator reduces the number of parts models and further reduces the cost of spare parts. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the running drive structure and the rigid cylindrical chain in the present invention; Figure 3 is Figure 2 the partial enlarged view I in Figure 4 is a schematic principle diagram of the running drive structure in the present invention; Figure 5 is a schematic structural diagram of the running mechanism and the rotation mechanism in the present invention; Figure 6 is a schematic structural diagram of the fixed ring, the rigid conical chain ring and the rotation drive structure in the present invention; Figure 7 is a partial exploded schematic diagram of the rigid conical chain ring in the present invention; Figure 8 Schematic structural diagram of the conical sprocket in the present invention; Figure 9 Schematic structural diagram of the arc-shaped mounting seat in the present invention; Figure 10 Schematic principle diagram of the rotary drive structure in the present invention; Figure 11 Schematic structural diagram of the rotary mechanism and the lifting mechanism in the present invention; Figure 12 Schematic principle diagram of the lifting drive structure in the present invention; Figure 13 Schematic diagram of the wire rope winding principle in the present invention.

[0020] In the figure: 1. Running mechanism; 11. Rectangular frame; 12. Rigid cylindrical chain; 121. Straight support plate; 122. First fixing pin; 123. Cylindrical sleeve; 13. Rolling wheel; 14. Running drive structure; 141. Running motor; 142. Running brake; 143. Running reducer; 144. Positive sprocket; 2. Rotary mechanism; 21. Fixed ring; 22. Rigid conical chain link; 221. Annular support plate; 222. Second fixing pin; 223. Conical sleeve; 23. Arc-shaped mounting seat; 24. Lower pressing wheel; 25. Side pressing wheel; 26. Rotary motor; 27. Rotary brake; 28. Commutator; 29. Conical sprocket; 3. Lifting mechanism; 31. Bracket; 32. Lifting motor; 33. Lifting brake; 34. Lifting reducer; 35. Drum; 36. Wire rope; 37. Suspension hook; 38. Fixed pulley block; 39. Movable pulley block. Detailed implementation manners

[0021] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", etc. indicating the orientation or positional relationship, it is only corresponding to the drawings of the present application for the convenience of describing the present invention; it should be understood that if there are terms such as "end", "side", "end part", "side part", "transverse", "longitudinal", etc. indicating the orientation or positional relationship, it is only corresponding to the length and width of the corresponding component, that is, the "end part" indicates the head and tail regions in the length direction of the corresponding component, and the "side part" indicates the head and tail regions in the width direction of the corresponding component; it is for the convenience of describing the present invention rather than indicating or implying that the device or element referred to must have a specific orientation.

[0022] Embodiment 1, in combination with the attached Figure 1-13, A suspended trolley for a bridge crane with a downward rotation function, comprising a running mechanism 1, a rotating mechanism 2 and a lifting mechanism 3 which are distributed in sequence from top to bottom. Specifically, the centers of gravity and / or centers of the running mechanism 1, the rotating mechanism 2 and the lifting mechanism 3 are located on the same vertical line.

[0023] During use, the running mechanism 1 moves in cooperation with the crane's trolley.

[0024] The running mechanism 1 includes a rectangular frame 11 and rigid cylindrical chains 12. Rolling wheels 13 that roll on the track are provided at each corner end of the rectangular frame 11; there are two rigid cylindrical chains 12, which are respectively installed on two crossbeams of the crane's trolley; a running drive structure 14 that cooperates with the two rigid cylindrical chains 12 is provided in the middle of the rectangular frame 11.

[0025] As required, each corner end of the rectangular frame 11 has two mirror - arranged rolling wheels 13. Preferably, the rolling wheels 13 are arranged on the top surface of the rectangular frame 11. Such a design makes the running mechanism 1 located below the crossbeam of the crane's trolley, so that the top of the suspended trolley is not higher than the crane's trolley; in this way, the height of the crane's trolley can be made to the limit, thereby ensuring the running safety factor of the crane's trolley and the suspended trolley, and ensuring that the crane's trolley and the suspended trolley will not collide with the workshop roof.

[0026] The running drive structure 14 includes a running motor 141, a running brake 142 and a running speed reducer 143 with two output shafts having the same steering and rotation speed. Both output shafts of the running speed reducer 143 are connected with positive sprockets 144 through rotating shafts. Through the cooperation of the positive sprockets 144 and the rigid cylindrical chains 12, the running of the running mechanism 1 is realized. Such a setting, due to the cooperation of the positive sprockets 144 and the rigid cylindrical chains 12, and the symmetric distribution of the running power positions of the running mechanism 1, ensures the running accuracy and the synchronization on both sides of the running mechanism 1.

[0027] It should be noted that: the assembly methods of the running motor 141, the running brake 142 and the running speed reducer 143 can adopt the assembly methods in the prior art, and will not be elaborated here.

[0028] The rigid cylindrical chain 12 includes two straight support plates 121 arranged at intervals. Multiple mounting holes for mounting the first fixing pins 122 are provided on both straight support plates 121 along their lengths.

[0029] As required, both ends of the first fixing pin 122 can be rotatably connected to the corresponding mounting holes, or can be fixedly connected to the corresponding mounting holes; when both ends of the first fixing pin 122 are fixedly connected to the corresponding mounting holes, in order to reduce the wear between the first fixing pin 122 and the positive sprocket 144, a cylindrical sleeve 123 is sleeved at the position of the first fixing pin 122 between the two straight support plates 121. Such a setting can effectively prevent the wheels from slipping on the mating plane compared with the way that the running wheels in the prior art directly roll on the track to drive the running mechanism 1, thereby improving the running accuracy; compared with the way of driving the running mechanism 1 by meshing of a gear and a rack in the prior art, it can effectively reduce the wear between the gear and the rack and extend the service life, ensure high-precision running for a long time, and only part of the cylindrical sleeve 123 can be replaced after wear, reducing the replacement and maintenance cost.

[0030] It should be noted that: the track is a track installed along the length direction of the cross beam of the crane trolley, which belongs to the prior art, and its structure and installation method will not be described again here.

[0031] As required, a laser rangefinder can also be provided at the top of the rectangular frame 11. A fixed light target is provided at one end of the crane trolley. The running motor 141 is adjusted according to the real-time measurement data of the laser rangefinder, further improving the running accuracy of the running mechanism 1.

[0032] The rotating mechanism 2 includes a fixed ring 21 installed on the bottom surface of the rectangular frame 11, and a rigid conical chain ring 22 is provided on the lower end surface of the fixed ring 21.

[0033] As required, the center of gravity of the fixed ring 21 and the center of gravity of the rectangular frame 11 are on the same vertical line. For better installation of the fixed ring 21, preferably, the rectangular frame 11 is a square frame.

[0034] Furthermore, the bottom cross section of the fixed ring 21 is an inverted T shape; for example, the cross section of the fixed ring 21 is an I shape.

[0035] The rotating mechanism 2 further includes two arc-shaped mounting seats 23 symmetrically arranged on both sides of the fixed ring 21. Both sides of the top of the arc-shaped mounting seat 23 are provided with a downward pressing wheel 24 that rolls downward on the top surface of the lower edge of the fixed ring 21 and a side pressing wheel 25 that rolls laterally on the side wall surface of the lower edge of the fixed ring 21.

[0036] As required, the arc-shaped mounting seat 23 can be correspondingly located outside the rigid conical chain ring 22. At this time, the side pressing wheel 25 rolls on the outer side wall surface of the lower edge of the fixed ring 21; it can also be correspondingly located inside the rigid conical chain ring 22. At this time, the side pressing wheel 25 rolls on the inner side wall surface of the lower edge of the fixed ring 21.

[0037] The rotating mechanism 2 further includes a rotation driving structure, which includes a rotation motor 26, a rotation brake 27, and a commutator 28 with two coaxial output shafts. The two output shafts of the commutator 28 rotate in opposite directions and are both connected with a tapered sprocket 29 through a rotating shaft. The operation of the rotating mechanism 2 is realized by the cooperation of the tapered sprocket 29 and the rigid tapered chain ring 22. With such a setting, due to the cooperation of the tapered sprocket 29 and the rigid tapered chain ring 22, and the symmetric distribution of the operating power of the rotating mechanism 2, the accuracy of the operation of the rotating mechanism 2 and the synchronization of both sides are ensured. At the same time, the inner side of the fixed ring 21 has a cavity, which can accommodate the rotation motor 26, the rotation brake 27, and the commutator 28, so that the rotation motor 26, the rotation brake 27, and the commutator 28 do not occupy additional vertical space, effectively reducing the height of the entire rotating mechanism 2, achieving the purpose of a compact structure, and making the force on the rotating mechanism 2 unit clearer, facilitating the calculation and maintenance of the force-bearing components of the rotating mechanism 2.

[0038] It should be noted that the tapered sprocket 29 can be understood as having tapered sprocket teeth and meshing with the tapered gaps between two adjacent tapered sleeves 223.

[0039] Furthermore, the commutator 28 adopts a 90-degree commutator 28. With such a setting, the gears corresponding to the two output shafts of the commutator 28 and the gear corresponding to the input shaft are the same gears, which is beneficial to reducing the types of accessories and lowering the cost of spare parts.

[0040] It should be noted that the assembly methods of the rotation motor 26, the rotation brake 27, and the commutator 28 can adopt the assembly methods in the prior art, and will not be elaborated here.

[0041] The rigid tapered chain ring 22 includes two concentric annular support plates 221. A plurality of mounting holes for fixedly installing the second fixing pins 222 are provided along the circumferential direction of both annular support plates 221, and the mounting holes are arranged radially along the annular support plates 221.

[0042] As needed, in order to reduce the wear between the rigid sprocket 144, the second fixing pin 222 is sleeved with a tapered sleeve 223 at the position between the two annular support plates 221. With such a setting, compared with the driving operation mechanism 1 in the prior art by the meshing method of a gear and an external gear ring, the wear can be effectively reduced, the service life can be prolonged, the high-precision operation and horizontal dimension for a long time can be ensured, and only part of the tapered sleeve 223 needs to be replaced after wear, reducing the replacement and maintenance cost; combined with the design that the cavity of the fixed ring 21 accommodates the rotation motor 26, the rotation brake 27, and the commutator 28, the function of high-precision operation for a long time can be realized.

[0043] It should be noted that the annular support plates 221, the rotation motor 26, the rotation brake 27, and the commutator 28 are all fixedly installed on the top surface of the lifting mechanism 3.

[0044] As needed, a planar rotation angle sensor is also provided on the top surface of the hoisting mechanism 3. The rotation angle of the hoisting mechanism 3 is monitored in real time through the planar rotation angle sensor, and the rotation motor 26 is adjusted in real time according to the monitoring results to ensure the accuracy of the rotation angle.

[0045] The hoisting mechanism 3 includes a bracket 31 with an annular support plate 221, a rotation motor 26, a rotation brake 27, and a commutator 28 mounted on the top. Inside the bracket 31, a drum 35 and a hoisting drive structure are mounted. Among them, the hoisting drive structure includes a hoisting motor 32, a hoisting brake 33, and a hoisting reducer 34 that are connected to each other. The hoisting reducer 34 has two output shafts with the same rotational speed, and both output shafts are connected to the drum 35. Specifically, the rotation directions of the two output shafts of the hoisting reducer 34 can be the same or opposite.

[0046] It should be noted that: The assembly methods of the hoisting motor 32, the hoisting brake 33, and the hoisting reducer 34 can adopt the assembly methods in the prior art, and will not be elaborated here.

[0047] Each drum 35 is correspondingly wound with a steel wire rope 36. The two ends of the steel wire rope 36 are respectively wound and fixed at both ends of the drum 35. The middle part of the steel wire rope 36 extends out, bypasses the movable pulley block 39 on the spreader 37, and then bypasses the fixed pulley block 38 at the bottom of the bracket 31. That is to say, one end of the steel wire rope 36 is fixed to one section of the corresponding drum 35. After winding this section of the drum 35 in sequence, it bypasses the movable pulley block 39 on the spreader 37, the fixed pulley block 38 at the bottom of the bracket 31, the movable pulley block 39 on the spreader 37 in sequence, winds around the other section of the drum 35, and then is fixedly connected to the drum 35.

[0048] The parts not detailed in the present invention are prior art. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, aiming to include all changes falling within the meaning and scope of the equivalent elements in the present invention.

Claims

1. A suspended trolley for a bridge crane with a downward rotation function, characterized in that, Comprising: A running mechanism (1), including a rectangular frame body (11) and two rigid cylindrical chains (12) respectively installed on two cross beams of the crane gantry. At each corner end of the rectangular frame body (11), there is a rolling wheel (13) rolling downward on the track, and in the middle, there is a running drive structure (14) cooperating with both rigid cylindrical chains (12); A rotating mechanism (2), installed below the rectangular frame body (11), including a fixed ring (21), a rigid conical chain ring (22) and a rotating drive structure. The rotating drive structure realizes the rotating function through cooperation with the rigid conical chain ring (22) by two symmetric conical sprockets (29); A hoisting mechanism (3), installed below the rotating mechanism (2), including a bracket (31). Inside the bracket (31), there is a hoisting drive structure and two drums (35). The hoisting drive structure synchronously drives the two drums (35) to unwind or wind their respective steel wire ropes (36) to complete the lifting operation of the lifted object.

2. The suspended trolley for a bridge crane with a lower rotation function according to claim 1, characterized in that: The running drive structure (14) includes a running motor (141), a running brake (142) and a running reducer (143) having two output shafts with the same steering and speed. The two output shafts of the running reducer (143) are both connected with positive sprockets (144) through rotating shafts and cooperate with the rigid cylindrical chains (12) to realize the moving function.

3. The suspended trolley for a bridge crane with a downward rotation function according to claim 1, characterized in that: The rigid cylindrical chain (12) includes two spaced straight support plates (121). Along the length direction between the two straight support plates (121), a plurality of first fixing pins (122) are installed, and the first fixing pins (122) are sleeved with cylindrical sleeves (123) to reduce wear and improve the service life.

4. The suspended trolley for a bridge crane with a downward rotation function according to claim 1, characterized in that: The rotating drive structure includes a rotating motor (26), a rotating brake (27) and a commutator (28) having two coaxial output shafts. The two output shafts of the commutator (28) are connected with conical sprockets (29) through rotating shafts and cooperate with the rigid conical chain ring (22) to realize the rotating function.

5. The suspended trolley for a bridge crane with a lower rotation function according to claim 1, characterized in that: The bottom cross section of the fixed ring (21) is an inverted T shape; the rotating mechanism (2) further includes two symmetric arc-shaped mounting seats (23) arranged on both sides of the fixed ring (21). At both sides of the top of the arc-shaped mounting seat (23), there are downward pressing wheels (24) rolling on the top surface of the lower edge part of the fixed ring (21) and side pressing wheels (25) rolling on the side wall surface of the lower edge part of the fixed ring (21).

6. The suspended trolley for a bridge crane with a downward rotation function according to claim 1, characterized in that: The rigid conical chain ring (22) includes two concentric annular support plates (221). Along the axial direction between the two annular support plates (221), radially arranged second fixing pins (222) are installed, and the second fixing pins (222) are sleeved with conical sleeves (223) to reduce wear and improve the service life.

7. The suspended trolley for a bridge crane with a lower rotation function according to claim 6, characterized in that: The taper of the conical sleeve (223) is 1.3 degrees.

8. The suspended trolley for a bridge crane with a lower rotation function according to claim 1, characterized in that: Both ends of the steel wire rope (36) are respectively wound and fixed at both ends of the corresponding drum (35), and the middle part extends out and bypasses the movable pulley block (39) on the spreader (37) and then bypasses the fixed pulley block (38) at the bottom of the bracket (31).

9. The suspended trolley for a bridge crane with a downward rotation function according to claim 1, characterized in that: The rotating drive structure is correspondingly located inside the fixed ring (21).

10. The suspended trolley for a bridge crane with a downward rotation function according to claim 1, characterized in that: A laser rangefinder is provided in the middle of the rectangular frame body (11) for measuring data in real time and adjusting the operation drive structure (14), further improving the operation accuracy; A planar rotation angle sensor is provided on the top surface of the lifting mechanism (3) for monitoring the rotation angle in real time and adjusting the rotation drive structure according to the monitoring results to ensure the accuracy of the rotation angle.

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