A slewing limit device for a marine crane

Abstract

A slewing limit device for a maritime crane comprises a mounting seat, a mounting bracket, a first limit bracket, a second limit bracket, a limit gear and a limit switch; the mounting bracket is connected to the turntable base plate through the mounting seat; the first limit bracket and the second limit bracket are respectively connected to the upper and lower parts of one side of the mounting bracket; the limit gear is located between the first limit bracket and the second limiter bracket, the limit gear comprises a gear plate and a gear ring, the axis of the gear plate is located between the first limit bracket and the second limiter bracket, a part of the gear ring is located between the first limit bracket and the second limiter bracket, the other part of the gear ring is located outside the first limit bracket and the second limiter bracket, and the gear ring is meshed with the slewing support; the limit switch is connected to the first limit bracket or the second limit bracket, and the linkage shaft of the limit switch passes through the first limit bracket or the second limit bracket and is connected to the limit gear; therefore, this design not only can achieve slewing limit, but also is easy to install and debug.

Description

Technical Field

[0001] The present invention relates to a slewing limit device, belonging to the technical field of cranes, and in particular to a slewing limit device for a maritime crane. Background Art

[0002] On offshore oil and gas platforms, maritime cranes are frequently used equipment. The built-in slewing limit device of the slip ring box can only limit the terminal action of the slewing mechanism, but cannot limit the movement of the slewing mechanism. Due to the large number of obstacles on the platform, the slewing mechanism cannot completely ensure 360° unobstructed rotation. Considering safety factors, it is necessary to limit the slewing angle range of the maritime crane. The crane is only allowed to slew within the safe permitted range. Therefore, it is necessary to set a limit device to predict or warn the current slewing angle to confirm whether it is within the safe and feasible range. The control program is fed back to the hydraulic actuator to determine whether the current slewing action can continue. Therefore, it is necessary to frequently set the safe angle of the slewing action according to needs.

[0003] The invention application with application number 201810377543.3 and application date April 25, 2018 discloses a slewing limit device for a marine crane, comprising a crane base, a slewing bearing, a crane slewing disk, a drive gearbox, a hydraulic motor and a slewing limit switch. A slewing bearing with internal teeth is installed on the crane base, and a drive gearbox is installed on the crane slewing disk. The hydraulic motor drives a pinion through the drive gearbox. The pinion and the slewing bearing form a pair of internally meshed drive gear pairs. Under the action of the hydraulic motor, the slewing limit switch cuts off the slewing drive power when it reaches the upper and lower limit positions, allowing the crane to slew within a set slewing angle range. Although this device can limit the slewing of the crane, due to the large number of obstacles on the maritime platform, it is not convenient to install a large mechanical limit device. The limit device is too large, which is not conducive to the smooth implementation of the slewing operation. In addition, the installation and debugging of the limit device are relatively cumbersome. Therefore, a slewing device that is easy to install and relatively simple to debug is needed.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the application, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects and problems of the prior art, such as the inconvenience of installation and the troublesome debugging, and to provide a slewing limit device for a maritime crane that is easy to install and relatively simple to debug.

[0006] To achieve the above objectives, the present invention provides a technical solution: a slew limit device for a maritime crane, comprising: a mounting seat, a mounting bracket, a first limit bracket, a second limit bracket, a limit gear, and a limit switch; the mounting bracket is connected to the bottom surface of the turntable base plate via the mounting seat; the first limit bracket is connected to an upper portion of one side of the mounting bracket, and the second limit bracket is connected to a lower portion of one side of the mounting bracket;

[0007] The limit gear is located in the area between the first limit bracket and the second limiter bracket, and the limit gear includes a gear plate and a tooth circle arranged around it. The axis of the gear plate is located between the first limit bracket and the second limiter bracket, a part of the tooth circle is located between the first limit bracket and the second limiter bracket, and the other part of the tooth circle is located outside the first limit bracket and the second limiter bracket, and the tooth circle is engaged with the slewing bearing; the limit switch is connected to the first limit bracket or the second limiter bracket, and the linkage shaft of the limit switch passes through the first limit bracket or the second limit bracket and is connected to the limit gear.

[0008] A pin shaft passes through the axis of the gear plate; a countersunk hole is provided at the axis center of the top surface of the pin shaft, and a fixed pin mounting hole is provided on the upper part of the pin shaft, and the fixed pin mounting hole extends from one side of the pin shaft through the countersunk hole to the other side.

[0009] The limit switch includes a fuselage, a connecting part, a connecting plate and a linkage shaft. The bottom of the fuselage is fixedly connected to the connecting plate through the connecting part, and a plurality of connecting plate through-holes are provided on the connecting plate. One end of the linkage shaft is connected to the fuselage, and the other end passes through the connecting part and the connecting plate in sequence and then extends into the countersunk hole.

[0010] A shaft through hole is provided on the linkage shaft, and a fixing pin is passed through between the shaft through hole and the fixing pin installation hole to connect the limit switch with the limit gear.

[0011] The mounting bracket includes a bracket top plate and an L-shaped bracket bottom plate, the bottom surface of the bracket top plate is fixedly connected to the top surface of the L-shaped bracket bottom plate; the top surface of the bracket top plate is fixedly connected to the bottom surface of the mounting seat, and the top surface of the mounting seat is fixedly connected to the bottom surface of the turntable base plate;

[0012] The mounting seat is provided with a plurality of first perforations, and the top plate of the bracket is provided with second perforations corresponding to the first perforations; the upper part of the bottom plate of the L-shaped bracket is provided with a plurality of third elliptical perforations, and the lower part of the bottom plate of the L-shaped bracket is provided with a plurality of fourth perforations.

[0013] The first limiting bracket is an L-shaped plate, which includes a first vertical plate and a first horizontal plate. The bottom surface of the first vertical plate is connected to the top surface of one end of the first horizontal plate. The other end of the first horizontal plate is provided with a first pin shaft mounting hole, and the first pin shaft mounting hole is provided with a plurality of fifth through holes along the circumference of its axis; the first vertical plate is provided with a plurality of sixth through holes.

[0014] The second limiting bracket is an L-shaped plate, which includes a second vertical plate and a second horizontal plate. The top surface of the second vertical plate is connected to the bottom surface of one end of the second horizontal plate. The other end of the second horizontal plate is provided with a second pin shaft mounting hole, and the second vertical plate is provided with several seventh through holes.

[0015] The top end of the pin is sleeved with a first bearing, and the bottom end of the pin is sleeved with a second bearing; the first bearing is embedded in the first pin mounting hole, and the second bearing is embedded in the second pin mounting hole.

[0016] The distance between the other end of the first transverse plate and the axis center of the first pin shaft mounting hole and the distance between the other end of the second transverse plate and the axis center of the second pin shaft mounting hole are both smaller than the radius of the gear plate.

[0017] A first bolt is passed through each of the first through-hole and the second through-hole to securely connect the mounting bracket to the mounting seat; a second bolt is passed through each of the sixth through-hole and the third through-hole to securely connect the first limiting bracket to the mounting bracket;

[0018] The third bolt is passed through the seventh through hole and the fourth through hole to fix the second limit bracket to the mounting bracket; the fourth bolt is passed through the fifth through hole and the connecting plate through hole to fix the limit switch to the first limit bracket.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. A slewing limit device for a maritime crane according to the present invention comprises a mounting seat, a mounting bracket, a first limit bracket, a second limit bracket, a limit gear and a limit switch; the mounting bracket is connected to the bottom surface of the turntable base plate through the mounting seat; the first limit bracket is connected to the upper part of one side of the mounting bracket, and the second limit bracket is connected to the lower part of one side of the mounting bracket; the limit gear is located in the area between the first limit bracket and the second limit bracket, the limit gear comprises a gear plate and a toothed area arranged around it, the axis of the gear plate is located between the first limit bracket and the second limit bracket, and a part of the toothed area is located between the first limit bracket and the second limit bracket Between the limiter brackets, the other part of the tooth girth is located outside the first limiter bracket and the second limiter bracket, and the tooth girth is meshed with the slewing bearing; the limit switch is connected to the first limiter bracket or the second limiter bracket, and the linkage shaft of the limit switch passes through the first limiter bracket or the second limiter bracket and is connected to the limit gear; in the application of this design, the limit device is installed under the large base plate of the turntable, making full use of the space under the large base plate of the turntable. After the installation and debugging of the device is completed, the rotation of the slewing bearing can drive the limit gear and the linkage shaft to move synchronously. After rotating to the warning angle, the limit switch is triggered to limit, and the installation and debugging are relatively simple and convenient. Therefore, the present invention can not only perform slewing limit, but also is relatively convenient to install and debug.

[0021] 2. In a slewing limit device for a maritime crane according to the present invention, a pin is passed through the axis of the gear plate; a countersunk hole is provided at the axis center of the top surface of the pin, and a fixed pin mounting hole is provided on the upper part of the pin, and the fixed pin mounting hole extends from one side of the pin through the countersunk hole to the other side; the limit switch includes a fuselage, a connecting portion, a connecting plate and a linkage shaft, the bottom of the fuselage is fixedly connected to the connecting plate through the connecting portion, and a plurality of connecting plate through-holes are provided on the connecting plate; one end of the linkage shaft is connected to the fuselage, and the other end passes through the connecting portion and the connecting plate in sequence and then extends into the countersunk hole; an axis through-hole is provided on the linkage shaft, and a fixed pin is passed through between the axis through-hole and the fixed pin mounting hole to connect the limit switch to the limit gear; in application of this design, the limit switch connects the linkage shaft to the pin through the fixed pin, which is relatively convenient to install and easy to maintain later. Therefore, the present invention is not only convenient to install, but also simple to maintain later.

[0022] 3. In a slewing limit device for a maritime crane according to the present invention, a first bolt is passed through the first through-hole and the second through-hole to fix the mounting bracket to the mounting base; a second bolt is passed through the sixth through-hole and the third through-hole to fix the first limit bracket to the mounting bracket; a third bolt is passed through the seventh through-hole and the fourth through-hole to fix the second limit bracket to the mounting bracket; a fourth bolt is passed through the fifth through-hole and the through-hole of the connecting plate to fix the limit switch to the first limit bracket; in application, the mounting base, the mounting bracket, the first limit bracket, the second limit bracket and the limit switch are all connected by bolts. During installation, the bolts can be pre-tightened first, and then the debugging device can be adjusted to the appropriate position before tightening all the bolts. Installation and debugging can be completed together, making installation and debugging relatively simple and convenient. Therefore, the present invention is not only convenient to install, but also relatively simple to debug. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the relative positions of the slewing limit device and the slewing support of the present invention.

[0024] Figure 2 It is a structural schematic diagram of the present invention.

[0025] Figure 3 It is a structural schematic diagram of the limiting gear in the present invention.

[0026] Figure 4 It is a structural diagram of the limit switch in the present invention.

[0027] Figure 5 It is a bottom view of the mounting bracket in the present invention.

[0028] Figure 6 It is a structural schematic diagram of the mounting bracket in the present invention.

[0029] Figure 7 It is a bottom view of the mounting base in the present invention.

[0030] Figure 8 It is a structural schematic diagram of the mounting base in the present invention.

[0031] Figure 9 It is a structural schematic diagram of the first limiting bracket in the present invention.

[0032] Figure 10 It is a top view of the first limiting bracket in the present invention.

[0033] Figure 11 It is a structural schematic diagram of the second limiting bracket in the present invention.

[0034] Figure 12 It is a bottom view of the second limiting bracket in the present invention.

[0035] Figure 13 It is a schematic diagram of the relative positions of the rotary limiting device and the large base plate of the turntable in the present invention.

[0036] In the figure: mounting base 1, first through-hole 101, first bolt 102, mounting bracket 2, second through-hole 201, third through-hole 202, fourth through-hole 203, bracket top plate 21, L-shaped bracket bottom plate 22, first limiting bracket 3, first vertical plate 301, first horizontal plate 302, sixth through-hole 303, first pin mounting hole 304, fifth through-hole 305, second bolt 306, second limiting bracket 31, second vertical plate 311, second horizontal plate 3 12. seventh through-hole 313, second pin mounting hole 314, third bolt 315, limit gear 4, gear plate 41, tooth circumference 42, pin 43, countersunk hole 431, fixing pin mounting hole 432, fixing pin 5, first bearing 6, second bearing 61, limit switch 7, body 70, connecting portion 71, connecting plate 72, fourth bolt 722, connecting plate through-hole 721, linkage shaft 73, shaft through-hole 731, turntable base plate 8, slewing bearing 9. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] See also Figure 1 — Figure 13 A slewing limit device for a maritime crane, comprising: a mounting base 1, a mounting bracket 2, a first limit bracket 3, a second limit bracket 31, a limit gear 4, and a limit switch 7; the mounting bracket 2 is connected to the bottom surface of a large base plate 8 of a turntable through the mounting base 1; the first limit bracket 3 is connected to an upper portion of one side of the mounting bracket 2, and the second limit bracket 31 is connected to a lower portion of one side of the mounting bracket 2;

[0039] The limit gear 4 is located in the area between the first limit bracket 3 and the second limiter bracket 31, and the limit gear 4 includes a gear plate 41 and a tooth circumference 42 arranged around it. The axis of the gear plate 41 is located between the first limit bracket 3 and the second limiter bracket 31, and a part of the tooth circumference 42 is located between the first limit bracket 3 and the second limiter bracket 31. The other part of the tooth circumference 42 is located outside the first limit bracket 3 and the second limiter bracket 31, and the tooth circumference 42 is engaged with the slewing bearing 9; the limit switch 7 is connected to the first limit bracket 3 or the second limiter bracket 31, and the linkage shaft 73 of the limit switch 7 passes through the first limit bracket 3 or the second limiter bracket 31 and is connected to the limit gear 4.

[0040] A pin 43 passes through the axis of the gear plate 41; a countersunk hole 431 is opened at the axis center of the top surface of the pin 43, and a fixing pin mounting hole 432 is opened on the upper part of the pin 43. The fixing pin mounting hole 432 extends from one side of the pin 43 through the countersunk hole 431 to the other side.

[0041] The limit switch 7 includes a body 70, a connecting part 71, a connecting plate 72 and a linkage shaft 73. The bottom of the body 70 is fixedly connected to the connecting plate 72 through the connecting part 71. The connecting plate 72 is provided with a plurality of connecting plate through-holes 721. One end of the linkage shaft 73 is connected to the body 70, and the other end passes through the connecting part 71 and the connecting plate 72 in sequence and then extends into the countersunk hole 431.

[0042] The linkage shaft 73 is provided with a shaft through-hole 731 , and a fixing pin 5 is passed through between the shaft through-hole 731 and the fixing pin mounting hole 432 to connect the limit switch 7 with the limit gear 4 .

[0043] The mounting bracket 2 includes a bracket top plate 21 and an L-shaped bracket bottom plate 22. The bottom surface of the bracket top plate 21 is fixedly connected to the top surface of the L-shaped bracket bottom plate 22. The top surface of the bracket top plate 21 is fixedly connected to the bottom surface of the mounting seat 1, and the top surface of the mounting seat 1 is fixedly connected to the bottom surface of the turntable large bottom plate 8.

[0044] The mounting base 1 is provided with a plurality of first through-holes 101, and the bracket top plate 21 is provided with a second through-hole 201 corresponding to the first through-hole 101; the upper part of the L-shaped bracket bottom plate 22 is provided with a plurality of elliptical third through-holes 202, and the lower part of the L-shaped bracket bottom plate 22 is provided with a plurality of fourth through-holes 203.

[0045] The first limiting bracket 3 is an L-shaped plate, which includes a first vertical plate 301 and a first horizontal plate 302. The bottom surface of the first vertical plate 301 is connected to the top surface of one end of the first horizontal plate 302. The other end of the first horizontal plate 302 is provided with a first pin shaft mounting hole 304. The first pin shaft mounting hole 304 is provided with a plurality of fifth through holes 305 along the circumference of its axis; the first vertical plate 301 is provided with a plurality of sixth through holes 303.

[0046] The second limiting bracket 31 is an L-shaped plate, which includes a second vertical plate 311 and a second horizontal plate 312. The top surface of the second vertical plate 311 is connected to the bottom surface of one end of the second horizontal plate 312. The other end of the second horizontal plate 312 is provided with a second pin shaft mounting hole 314, and the second vertical plate 311 is provided with a plurality of seventh through holes 313.

[0047] The top end of the pin shaft 43 is sleeved with a first bearing 6 , and the bottom end of the pin shaft 43 is sleeved with a second bearing 61 ; the first bearing 6 is embedded in the first pin shaft mounting hole 304 , and the second bearing 61 is embedded in the second pin shaft mounting hole 314 .

[0048] The distance between the other end of the first transverse plate 302 and the axis of the first pin mounting hole 304 and the distance between the other end of the second transverse plate 312 and the axis of the second pin mounting hole 314 are both smaller than the radius of the gear plate 41 .

[0049] The first through-hole 101 and the second through-hole 201 are both penetrated by a first bolt 102 to securely connect the mounting bracket 2 to the mounting base 1; the sixth through-hole 303 and the third through-hole 202 are both penetrated by a second bolt 306 to securely connect the first limiting bracket 3 to the mounting bracket 2;

[0050] The third bolt 315 is passed through the seventh through-hole 313 and the fourth through-hole 203 to fix the second limit bracket 31 to the mounting bracket 2; the fourth bolt 722 is passed through the fifth through-hole 305 and the connecting plate through-hole 721 to fix the limit switch 7 to the first limit bracket 3.

[0051] The principle of the present invention is described as follows:

[0052] Adjusting the tooth clearance between the slewing reducer and the slewing support 9 mainly involves adjusting the eccentric direction of the output shaft of the slewing reducer so that the tooth clearance between the slewing reducer and the slewing support 9 can mesh normally under the requirements of the specification. In this way, after installing the limit device, more accurate positioning and signal transmission can be performed, and the same pitch circle is convenient for structural design and parameter conversion. In the case of different pitch circles, the tooth clearance parameters of the limit gear under different pitch circles can be adjusted by calculation to achieve the same working requirements.

[0053] Example 1:

[0054] See also Figure 1 — Figure 13 A slewing limit device for a maritime crane, comprising: a mounting base 1, a mounting bracket 2, a first limit bracket 3, a second limit bracket 31, a limit gear 4, and a limit switch 7; the mounting bracket 2 is connected to the bottom surface of a large base plate 8 of a turntable through the mounting base 1; the first limit bracket 3 is connected to an upper portion of one side of the mounting bracket 2, and the second limit bracket 31 is connected to a lower portion of one side of the mounting bracket 2;

[0055] The limit gear 4 is located in the area between the first limit bracket 3 and the second limiter bracket 31, and the limit gear 4 includes a gear plate 41 and a tooth circumference 42 arranged around it. The axis of the gear plate 41 is located between the first limit bracket 3 and the second limiter bracket 31, and a part of the tooth circumference 42 is located between the first limit bracket 3 and the second limiter bracket 31. The other part of the tooth circumference 42 is located outside the first limit bracket 3 and the second limiter bracket 31, and the tooth circumference 42 is engaged with the slewing support 9 (preferably, the number of teeth of the tooth circumference 42 is consistent with the number of teeth of the slewing support 9); the limit switch 7 is connected to the first limit bracket 3 or the second limiter bracket 31, and the linkage shaft 73 of the limit switch 7 passes through the first limit bracket 3 or the second limiter bracket 31 and is connected to the limit gear 4.

[0056] In application, first adjust the tooth clearance between the slewing reducer and the slewing bearing 9 in the maritime crane to ensure that the limit gear 4 and the slewing reducer are on the same pitch circle, and then adjust the tooth clearance between the limit gear 4 and the slewing bearing 9 to ensure that the limit gear 4 and the slewing reducer run synchronously and smoothly during subsequent actions; after the tooth clearance is adjusted, the limit gear 4 is movably connected to the first limit bracket 3 and the second limiter bracket 31, and then the limit switch 7 is fixed to the first limit bracket 3 or the second limit bracket 31. At this time, the linkage shaft 73 of the limit switch 7 passes through the first limit bracket 3 or the second limit bracket 31 and is connected to the limit gear 4; On the basis of the same pitch circle of the speed reducer, the mounting seat 1 is welded and fixed to the bottom surface of the turntable large base plate 8, and then the mounting bracket 2 is connected to the bottom surface of the mounting seat 1, and finally the first limit bracket 3 and the second limit bracket 31 are connected to the mounting bracket 2 to complete the installation of the limit device; the position of the limit switch 7 is adjusted according to the actual needs on site. When the slewing action is performed, the slewing reducer and the limit gear 4 run synchronously on the slewing support 9. When the rotation reaches the preset alarm position, the limit switch 7 is triggered, and the driving power of the hydraulic rotation is cut off through the control program, limiting the slewing action, so that the maritime crane rotates within the limited slewing angle range, achieving the purpose of limited rotation to ensure safe operation.

[0057] Example 2:

[0058] The basic content is the same as Example 1, except that:

[0059] The axis of the gear plate 41 is penetrated by a pin shaft 43; a countersunk hole 431 is provided at the axis center of the top surface of the pin shaft 43, and a fixing pin mounting hole 432 is provided on the upper part of the pin shaft 43, and the fixing pin mounting hole 432 extends from one side of the pin shaft 43 through the countersunk hole 431 to the other side; the limit switch 7 includes a fuselage 70, a connecting portion 71, a connecting plate 72 and a linkage shaft 73, and the bottom of the fuselage 70 is fixedly connected to the connecting plate 72 through the connecting portion 71, and a plurality of connecting plate through holes 721 are provided on the connecting plate 72; one end of the linkage shaft 73 is connected to the fuselage 70, and the other end penetrates the connecting portion 71 and the connecting plate 72 in sequence and then extends into the countersunk hole 431; the linkage shaft 73 is provided with an axis through hole 731, and a fixing pin 5 is penetrated between the axis through hole 731 and the fixing pin mounting hole 432 to connect the limit switch 7 with the limit gear 4.

[0060] In application, an axis through hole 731 is opened on the linkage shaft 73. After the linkage shaft 73 extends to the countersunk hole 431 on the pin shaft 43, the axis through hole 731 is connected with the fixed pin mounting hole 432, and the fixed pin 5 passes through it to connect the limit switch 7 with the limit gear 4. The installation method is more convenient and is conducive to later maintenance.

[0061] Example 3:

[0062] The basic content is the same as Example 1, except that:

[0063] The mounting bracket 2 includes a bracket top plate 21 and an L-shaped bracket bottom plate 22, the bottom surface of the bracket top plate 21 is fixedly connected to the top surface of the L-shaped bracket bottom plate 22; the top surface of the bracket top plate 21 is fixedly connected to the bottom surface of the mounting seat 1, and the top surface of the mounting seat 1 is fixedly connected to the bottom surface of the turntable large bottom plate 8; the mounting seat 1 is provided with a plurality of first through-holes 101, and the bracket top plate 21 is provided with second through-holes 201 corresponding to the first through-holes 101; the upper part of the L-shaped bracket bottom plate 22 is provided with a plurality of oval third through-holes 202, and the lower part of the L-shaped bracket bottom plate 22 is provided with a plurality of fourth through-holes The first limiting bracket 3 is an L-shaped plate, which includes a first vertical plate 301 and a first horizontal plate 302. The bottom surface of the first vertical plate 301 is connected to the top surface of one end of the first horizontal plate 302. The other end of the first horizontal plate 302 is provided with a first pin shaft mounting hole 304. The first pin shaft mounting hole 304 is provided with a plurality of fifth through holes 305 along the circumference of its axis. The first vertical plate 301 is provided with a plurality of sixth through holes 303. The second limiting bracket 31 is an L-shaped plate, which includes a second vertical plate 311 and a second horizontal plate 312. The top surface of the second vertical plate 311 is connected to the bottom surface of one end of the second horizontal plate 312. The second cross plate 312 is connected to the second cross plate 314 at the other end, and the second vertical plate 311 is provided with a plurality of seventh through holes 313; the top end of the pin 43 is sleeved with a first bearing 6, and the bottom end of the pin 43 is sleeved with a second bearing 61; the first bearing 6 is embedded in the first cross plate 304, and the second bearing 61 is embedded in the second cross plate 314; the distance between the other end of the first cross plate 302 and the axis of the first cross plate 304 and the distance between the other end of the second cross plate 312 and the axis of the second cross plate 314 are both smaller than at the radius of the gear plate 41; the first bolt 102 is passed through the first through-hole 101 and the second through-hole 201 to fix the mounting bracket 2 to the mounting seat 1; the second bolt 306 is passed through the sixth through-hole 303 and the third through-hole 202 to fix the first limit bracket 3 to the mounting bracket 2; the third bolt 315 is passed through the seventh through-hole 313 and the fourth through-hole 203 to fix the second limit bracket 31 to the mounting bracket 2; the fourth bolt 722 is passed through the fifth through-hole 305 and the connecting plate through-hole 721 to fix the limit switch 7 to the first limit bracket 3.

[0064] In application, first, the bracket top plate 21 is fixedly connected to the mounting seat 1 by the first bolt 102, the first limit bracket 3 is fixedly connected to the mounting bracket 2 by the second bolt 306, and the second limit bracket 31 is fixedly connected to the mounting bracket 2 by the third bolt 315; then the two ends of the pin shaft 2 are respectively connected to the first bearing 6 and the second bearing 61, the first bearing 6 is embedded in the first pin shaft mounting hole 304, and the second bearing 61 is embedded in the second pin shaft mounting hole 314, and then the linkage shaft 731 of the limit switch 7 is inserted into the countersunk hole 431, and the fixing pin 5 is passed through the shaft through-hole 731 and the fixing pin mounting hole 432, and the limit switch 7 is connected to the limit gear 4, and finally the limit switch 7 is fixedly connected to the first limit bracket 3 by the fourth bolt 722, and all bolts are tightened. During the installation process, debugging and installation can be carried out at the same time, and debugging and installation are more convenient.

[0065] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed in the present invention should be included in the protection scope recorded in the claims.

Claims

1. A slewing limit device for a maritime crane, characterized in that: The limiting device comprises: a mounting seat (1), a mounting bracket (2), a first limiting bracket (3), a second limiting bracket (31), a limiting gear (4) and a limit switch (7); the mounting bracket (2) is connected to the bottom surface of the turntable base plate (8) through the mounting seat (1); the first limiting bracket (3) is connected to the upper part of one side of the mounting bracket (2), and the second limiting bracket (31) is connected to the lower part of one side of the mounting bracket (2); the limiting gear (4) is located in the area between the first limiting bracket (3) and the second limiting bracket (31), and the limiting gear (4) comprises a gear plate (41) and a tooth circumference (42) arranged around it. The axis of the gear plate (41) is located between the first limit bracket (3) and the second limit bracket (31), a portion of the tooth girth (42) is located between the first limit bracket (3) and the second limit bracket (31), and another portion of the tooth girth (42) is located outside the first limit bracket (3) and the second limit bracket (31), and the tooth girth (42) is meshed with the slewing bearing (9); the limit switch (7) is connected to the first limit bracket (3) or the second limit bracket (31), and the linkage shaft (73) of the limit switch (7) passes through the first limit bracket (3) or the second limit bracket (31) and is connected to the limit gear (4); A pin (43) passes through the axis of the gear plate (41); a countersunk hole (431) is provided at the axis of the top surface of the pin (43); a fixed pin mounting hole (432) is provided on the upper portion of the pin (43); the fixed pin mounting hole (432) extends from one side of the pin (43) through the countersunk hole (431) to the other side; The limit switch (7) comprises a body (70), a connecting portion (71), a connecting plate (72) and a linkage shaft (73); the bottom of the body (70) is fixedly connected to the connecting plate (72) via the connecting portion (71); the connecting plate (72) is provided with a plurality of connecting plate through-holes (721); one end of the linkage shaft (73) is connected to the body (70), and the other end passes through the connecting portion (71) and the connecting plate (72) in sequence and then extends into the countersunk hole (431); The linkage shaft (73) is provided with a shaft through-hole (731), and a fixing pin (5) is passed through between the shaft through-hole (731) and the fixing pin mounting hole (432) to connect the limit switch (7) with the limit gear (4); The mounting bracket (2) comprises a bracket top plate (21) and an L-shaped bracket bottom plate (22), wherein the bottom surface of the bracket top plate (21) is fixedly connected to the top surface of the L-shaped bracket bottom plate (22); the top surface of the bracket top plate (21) is fixedly connected to the bottom surface of the mounting seat (1), and the top surface of the mounting seat (1) is fixedly connected to the bottom surface of the turntable large bottom plate (8); the mounting seat (1) is provided with a plurality of first through-holes (101), and the bracket top plate (21) is provided with second through-holes (201) corresponding to the first through-holes (101); the upper portion of the L-shaped bracket bottom plate (22) is provided with a plurality of elliptical third through-holes (202), and the lower portion of the L-shaped bracket bottom plate (22) is provided with a plurality of fourth through-holes (203).

2. A marine crane slewing limit device according to claim 1, characterized in that: The first limiting bracket (3) is an L-shaped plate, which includes a first vertical plate (301) and a first horizontal plate (302), the bottom surface of the first vertical plate (301) is connected to the top surface of one end of the first horizontal plate (302), the other end of the first horizontal plate (302) is provided with a first pin shaft mounting hole (304), and the first pin shaft mounting hole (304) is provided with a plurality of fifth through holes (305) along the circumference of its axis; the first vertical plate (301) is provided with a plurality of sixth through holes (303).

3. A marine crane rotation limiting device according to claim 2, characterized in that: The second limiting bracket (31) is an L-shaped plate, which includes a second vertical plate (311) and a second horizontal plate (312), the top surface of the second vertical plate (311) is connected to the bottom surface of one end of the second horizontal plate (312), the other end of the second horizontal plate (312) is provided with a second pin shaft mounting hole (314), and the second vertical plate (311) is provided with a plurality of seventh through holes (313).

4. A marine crane rotation limiting device according to claim 3, characterized in that: The top end of the pin shaft (43) is sleeved with a first bearing (6), and the bottom end of the pin shaft (43) is sleeved with a second bearing (61); the first bearing (6) is embedded in the first pin shaft mounting hole (304), and the second bearing (61) is embedded in the second pin shaft mounting hole (314).

5. The marine crane rotation limiting device according to claim 4, characterized in that: The distance between the other end of the first transverse plate (302) and the axis of the first pin shaft mounting hole (304) and the distance between the other end of the second transverse plate (312) and the axis of the second pin shaft mounting hole (314) are both smaller than the radius of the gear plate (41).

6. The marine crane rotation limiting device according to claim 5, characterized in that: The first through-hole (101) and the second through-hole (201) are both penetrated by a first bolt (102), which fixes the mounting bracket (2) to the mounting seat (1); the sixth through-hole (303) and the third through-hole (202) are both penetrated by a second bolt (306), which fixes the first limit bracket (3) to the mounting bracket (2); the seventh through-hole (313) and the fourth through-hole (203) are both penetrated by a third bolt (315), which fixes the second limit bracket (31) to the mounting bracket (2); the fifth through-hole (305) and the connecting plate through-hole (721) are both penetrated by a fourth bolt (722), which fixes the limit switch (7) to the first limit bracket (3).

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