Angle steering gear of crane and crane

Abstract

The utility model discloses an angle steering gear of a crane and the crane, and relates to the technical field of cranes, the angle steering gear comprises a torsion bar, a transmission shaft, a power-assisted mechanism, an angle sensor and a control module, the upper end of the torsion bar is connected with a steering wheel and can twist under the driving of the steering wheel, and the lower end of the torsion bar is connected with a first gear; the two ends of the transmission shaft are a connecting end and an output end respectively, the connecting end is connected with a second gear, the second gear is meshed with the first gear, and the torsion bar can drive the transmission shaft to rotate in the axial direction through the first gear and the second gear during torsion; the power-assisted mechanism comprises a motor and a transmission assembly, an output shaft of the motor is connected to the output end of the transmission shaft through the transmission assembly, and the motor is used for driving the transmission assembly to drive the transmission shaft to rotate in the axial direction when the torsion bar is twisted. The angle sensor is used for measuring the torsion angle of the torsion bar. The power assisting mechanism can provide assisting power when the torsion bar is twisted, arrangement of the torsion bar and the transmission assembly does not interfere with each other, the structure is compact, and structural arrangement is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of cranes, in particular to an angle steering device of a crane and a crane. Background Art

[0002] The angle steering gear of a crane usually refers to the steering gear mechanism in the steering system, which is responsible for converting the steering angle input by the driver through the steering wheel into the steering angle of the wheel. At present, hydraulic circulating ball power steering gears are widely used in cranes. The input end of the hydraulic circulating ball power steering gear is connected to the steering wheel, and the rocker arm at the output end is connected to the steering knuckle arm through a steering tie rod (steering straight tie rod). The swing of the rocker arm drives the swing of the steering knuckle arm to achieve wheel steering. However, the hydraulic circulating ball power steering gear generally uses a longer steering tie rod. The longer steering tie rod is used to adapt to the space occupied by the hydraulic circulating ball power steering gear, or the longer steering tie rod is used to reduce the transmission ratio between the steering knuckle arm and the rocker arm. Both methods require increasing the length of the transmission shaft, which results in the hydraulic circulating ball power steering gear occupying a large space, which is not conducive to the structural layout of the crane. Utility Model Content

[0003] The main purpose of the utility model is to provide an angle steering gear for a crane and a crane, aiming to solve the technical problem in the prior art that the hydraulic circulating ball power steering gear needs to increase the length of the transmission shaft, resulting in a large occupied space and being unfavorable for the structural layout of the crane.

[0004] To achieve the above-mentioned purpose, the utility model provides an angle steering device for a crane, which is used to assist the steering wheel of the crane in steering. The angle steering device includes a torsion bar, a transmission shaft, a power-assisting mechanism, an angle sensor and a control module. The torsion bar extends vertically, the upper end of the torsion bar is connected to the steering wheel and can be twisted under the drive of the steering wheel, and the lower end of the torsion bar is connected to a first gear; the transmission shaft extends horizontally, the two ends of the transmission shaft are respectively a connecting end and an output end, the connecting end is connected to a second gear, the second gear is meshed with the first gear, and the torsion bar can drive the transmission shaft to rotate along its axial direction through the first gear and the second gear when twisting; the power-assisting mechanism includes a motor and a transmission assembly, the output shaft of the motor is connected to the output end of the transmission shaft through the transmission assembly, and the motor is used to drive the transmission assembly to drive the transmission shaft to rotate along its axial direction when the torsion bar is twisted; the angle sensor is used to measure the torsion angle of the torsion bar; the control module is communicatively connected to the angle sensor, the motor and the speed sensor of the crane.

[0005] In one embodiment, the output shaft of the motor extends along the horizontal direction, and the transmission assembly includes a first pulley, a second pulley and a synchronous belt, the first pulley is arranged at the output end, the second pulley is arranged on the output shaft, and the synchronous belt is wound around the first pulley and the second pulley.

[0006] In one embodiment, the outer diameter of the first pulley is greater than the outer diameter of the second pulley.

[0007] In one embodiment, the angle steering device further includes a first accommodating shell, the angle sensor is disposed in the first accommodating shell, the torsion bar passes through the first accommodating shell, and the first gear is located below the first accommodating shell.

[0008] In one embodiment, the first containing shell includes a first shell and a second shell, and the first shell is located above the second shell, the torsion bar is sequentially inserted into the first shell and the second shell, and the torsion bar is connected to the first shell through a first deep groove ball bearing, and the torsion bar is connected to the second shell through a sliding bearing, the first gear is located below the second shell, and the first gear is connected to the second shell through an angular contact bearing.

[0009] In one embodiment, the first housing extends upward to form an extension portion, and the extension portion is connected to the torsion bar via an annular oil seal structure, and the oil seal structure is located above the first deep groove ball bearing.

[0010] In one embodiment, the angle steering device further includes a second containing shell, the transmission assembly is located in the second containing shell, the transmission shaft passes through the second containing shell, and the second gear is located outside the second containing shell.

[0011] In one embodiment, the second accommodating shell includes a third shell and a fourth shell, the second gear is connected to the third shell via a second deep groove ball bearing, and the transmission shaft is connected to the fourth shell via a third deep groove ball bearing.

[0012] In one embodiment, both the first gear and the second gear are bevel gears.

[0013] The utility model also provides a crane, comprising a steering wheel and the above-mentioned angle steering device, wherein the upper end of the torsion bar of the angle steering device is connected to the steering wheel.

[0014] The angle steering device and crane of the crane proposed in the utility model are connected to the first gear and the second gear on the torsion bar and the transmission shaft respectively, so that the first gear and the second gear are meshed, so that the torsion of the torsion bar can be transmitted to the transmission shaft through the meshing of the first gear and the second gear. When the torsion bar is twisted, the torsion angle of the torsion bar is measured in real time by the angle sensor, the control module obtains the torsion angle information of the torsion bar and the driving speed information of the crane in real time, and adjusts the working state of the motor in real time according to the torsion angle information and the driving speed information, and the motor drives the transmission shaft to rotate through the transmission assembly, thereby providing additional power for the rotation of the transmission shaft, so that the power assist mechanism provides power when the driver turns the steering wheel, thereby reducing the operation intensity of the driver when turning the steering wheel. In the angle steering device proposed in the utility model, the second gear is connected to the connecting end of the transmission shaft, and the transmission assembly is connected to the output end of the transmission shaft, so that the torsion bar and the transmission assembly jointly drive the transmission shaft to rotate without interfering with each other, and there is no need to increase the length of the transmission shaft, so that the angle steering device structure is more compact, occupies less space, and is convenient for the structural arrangement of the angle steering device in the crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 A structural schematic diagram of an embodiment of an angle steering device for a crane provided by the utility model;

[0017] Figure 2 The utility model is a schematic cross-sectional structure diagram of an embodiment of an angle steering device for a crane provided by the utility model.

[0018] Description of Figure Numbers:

[0019] 10. torsion bar; 11. first gear; 20. transmission shaft; 21. second gear; 30. power assist mechanism; 31. motor; 32. transmission assembly; 321. first pulley; 322. second pulley; 323. synchronous belt; 40. angle sensor; 50. first accommodating shell; 51. first housing; 52. second housing; 53. first deep groove ball bearing; 54. sliding bearing; 55. angular contact bearing; 56. oil seal structure; 60. second accommodating shell; 61. third housing; 62. fourth housing; 63. second deep groove ball bearing; 64. fourth deep groove ball bearing.

[0020] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0023] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0024] In the present invention, the description of the directions such as "upper" and "lower" is as follows: Figure 1 and Figure 2 The directions shown are for reference only and are used to explain the Figure 1 and Figure 2 The relative position relationship between the components in the shown posture. If the specific posture changes, the directional indication will also change accordingly.

[0025] At present, hydraulic circulating ball power steering is widely used in cranes. The input end of the hydraulic circulating ball power steering is connected to the steering wheel, and the rocker arm at the output end is connected to the steering knuckle arm through a steering tie rod (steering straight tie rod). The swing of the rocker arm drives the swing of the steering knuckle arm to achieve wheel steering. However, the hydraulic circulating ball power steering generally uses a longer steering tie rod. The longer steering tie rod is used to adapt to the space occupied by the hydraulic circulating ball power steering, or the longer steering tie rod is used to reduce the transmission ratio between the steering knuckle arm and the rocker arm. Both methods require increasing the length of the transmission shaft, which results in the hydraulic circulating ball power steering occupying a large space, which is not conducive to the structural layout of the crane.

[0026] The utility model provides an angle steering device for a crane, comprising a torsion bar 10, a transmission shaft 20, a power-assist mechanism 30, an angle sensor 40 and a control module. The torsion bar 10 extends vertically, the upper end of the torsion bar 10 is connected to a steering wheel and can be twisted under the drive of the steering wheel, and the lower end of the torsion bar 10 is connected to a first gear 11; the transmission shaft 20 extends horizontally, the two ends of the transmission shaft 20 are respectively a connecting end and an output end, the connecting end is connected to a second gear 21, the second gear 21 is meshed with the first gear 11, and the torsion bar 10 can drive the transmission shaft 20 to rotate along its axial direction through the first gear 11 and the second gear 21 when twisting; the power-assist mechanism 30 comprises a motor 31 and a transmission assembly 32, the output shaft of the motor 31 is connected to the output end of the transmission shaft 20 through the transmission assembly 32, and the motor 31 is used to drive the transmission assembly 32 to drive the transmission shaft 20 to rotate along its axial direction when the torsion bar 10 is twisted; the angle sensor 40 is used to measure the torsion angle of the torsion bar 10; the control module is communicatively connected to the angle sensor 40, the motor 31 and the speed sensor of the crane.

[0027] See also Figure 1 , Figure 1The up and down directions in the figure are vertical. The upper end of the torsion bar 10 is connected to the steering wheel of the crane. When the steering wheel rotates, the torsion bar 10 can be driven to twist. The first gear 11 connected to the lower end of the twisting rotates synchronously with the torsion bar 10. The twisting of the torsion bar 10 is transmitted to the transmission shaft 20 through the meshing of the first gear 11 and the second gear 21, thereby transmitting the rotation of the steering wheel to the transmission shaft 20. At the same time, during the twisting process of the torsion bar 10, the angle sensor 40 measures the twisting angle of the torsion bar 10 in real time and sends the twisting angle information of the torsion bar 10 to the control module. The control module can obtain the twisting angle information of the torsion bar 10 and the driving speed information of the crane in real time, and can adjust the working state of the motor 31 in real time according to the twisting angle information and the driving speed information. The motor 31 drives the transmission shaft 20 to rotate through the transmission assembly 32, thereby providing additional power for the rotation of the transmission shaft 20 and achieving the power assist for the transmission shaft 20. It can be explained that the angle sensor 40 can adopt the angle sensor 40 in the prior art, and the control module can adopt the controller or central processing unit in the prior art, and the utility model does not limit this. When the control module adopts a controller, the controller is connected to the speed sensor of the crane through a CAN line, and the controller is powered by a battery of the crane.

[0028] The angle steering device of the crane proposed in the utility model connects the first gear 11 and the second gear 21 to the torsion bar 10 and the transmission shaft 20 respectively, so that the first gear 11 and the second gear 21 are meshed, so that the torsion of the torsion bar 10 can be transmitted to the transmission shaft 20 through the meshing of the first gear 11 and the second gear 21. When the torsion bar 10 is twisted, the torsion angle of the torsion bar 10 is measured in real time by the angle sensor 40, and the control module obtains the torsion angle information of the torsion bar 10 and the driving speed information of the crane in real time, and adjusts the working state of the motor 31 in real time according to the torsion angle information and the driving speed information. The motor 31 drives the transmission shaft 20 to rotate through the transmission assembly 32, thereby providing additional power for the rotation of the transmission shaft 20, so that the power assist mechanism 30 provides power assist when the driver turns the steering wheel, thereby reducing the operation intensity of the driver when turning the steering wheel. In the angle steering device proposed by the utility model, the second gear 21 is connected to the connecting end of the transmission shaft 20, and the transmission assembly 32 is connected to the output end of the transmission shaft 20, so that the torsion bar 10 and the transmission assembly 32 jointly drive the transmission shaft 20 to rotate without interfering with each other, and there is no need to increase the length of the transmission shaft 20, so that the angle steering device structure is more compact, occupies less space, and is convenient for the structural arrangement of the angle steering device in the crane.

[0029] In one embodiment, the output shaft of the motor 31 extends in a horizontal direction, and the transmission assembly 32 includes a first pulley 321, a second pulley 322 and a synchronous belt 323, the first pulley 321 is arranged at the output end, the second pulley 322 is arranged on the output shaft, and the synchronous belt 323 is wound around the first pulley 321 and the second pulley 322.

[0030] See also Figure 1 The output shaft of the motor 31 and the transmission shaft 20 are in the same direction, the first pulley 321 is arranged at the output end of the transmission shaft 20, and the second pulley 322 is arranged at the output shaft of the motor 31. The second pulley 322 can rotate under the drive of the output shaft and drive the first pulley 321 to rotate synchronously through the synchronous belt 323, thereby driving the transmission shaft 20 to rotate, and realizing the assistance of the motor 31 to the transmission shaft 20. The synchronous belt 323 transmission can provide smooth and continuous power transmission, reduce vibration and noise, and improve the stability and service life of the transmission assembly 32; and the synchronous belt 323 can adjust the length as needed, provide a certain elasticity, and help absorb and alleviate the impact and vibration generated when the transmission shaft 20 rotates. It can be explained that the first pulley 321 and the second pulley 322 can adopt the V-shaped pulley in the prior art, and the utility model does not limit this.

[0031] In one embodiment, the outer diameter of the first pulley 321 is greater than the outer diameter of the second pulley 322. It can be understood that the first pulley 321 is disposed at the output end of the transmission shaft 20, and the second pulley 322 is disposed at the output shaft of the motor 31. The first pulley 321 and the second pulley 322 keep rotating synchronously, so that the transmission assembly 32 can reduce the rotation speed of the transmission shaft 20, provide greater torque for the transmission shaft 20, and thus improve the power-assisting effect.

[0032] In one embodiment, the angle steering gear further includes a first accommodating shell 50 , the angle sensor 40 is disposed in the first accommodating shell 50 , the torsion bar 10 passes through the first accommodating shell 50 , and the first gear 11 is located below the first accommodating shell 50 .

[0033] See also Figure 2 The first housing shell 50 is located between the upper and lower ends of the torsion bar 10. The first housing shell 50 is annular and is used to accommodate the angle sensor 40, provide protection for the angle sensor 40, prevent the angle sensor 40 from being damaged by external environmental factors, and ensure the accurate and stable operation of the angle sensor 40. The first housing shell 50, the torsion bar 10 and the first gear 11 are integrated into one body, which is convenient for loading and unloading and maintenance.

[0034] In one embodiment, the first accommodating shell 50 includes a first shell 51 and a second shell 52, and the first shell 51 is located above the second shell 52, the torsion bar 10 is sequentially inserted into the first shell 51 and the second shell 52, and the torsion bar 10 is connected to the first shell 51 through a first deep groove ball bearing 53, and the torsion bar 10 is connected to the second shell 52 through a sliding bearing 54, the first gear 11 is located below the second shell 52, and the first gear 11 is connected to the second shell 52 through an angular contact bearing 55.

[0035] Furthermore, the first housing 51 and the second housing 52 are detachably connected, which is convenient for inspection and maintenance of the angle sensor 40 in the first housing 50. The first housing 51 and the torsion bar 10 are connected by the first deep groove ball bearing 53, and the second housing 52 and the torsion bar 10 are connected by the sliding bearing 54. When the torsion bar 10 is twisted, it can rotate relative to the first housing 51 and the second housing 52 respectively, which can greatly reduce the friction between the torsion bar 10 and the first housing 51 and the second housing 52, and ensure the smooth twisting of the torsion bar 10. The first gear 11 is connected to the second housing 52 by an angular contact bearing 55. The angular contact bearing 55 has high operating accuracy and strong load bearing capacity, which can ensure that the first gear 11 maintains stable positioning during operation and reduce transmission errors caused by installation errors or small displacements during operation.

[0036] In one embodiment, the first housing 51 extends upward to form an extension portion, and the extension portion is connected to the torsion bar 10 through an annular oil seal structure 56, and the oil seal structure 56 is located above the first deep groove ball bearing 53. Furthermore, the oil seal structure 56 is used to block the gap between the first deep groove ball bearing 53 and the external environment, providing a sealed operating environment for the first deep groove ball bearing 53, so that the first deep groove ball bearing 53 is protected from damage by external environmental factors.

[0037] In one embodiment, the angle steering device further includes a second accommodating shell 60 , the transmission assembly 32 is located in the second accommodating shell 60 , the transmission shaft 20 passes through the second accommodating shell 60 , and the second gear 21 is located outside the second accommodating shell 60 .

[0038] Please continue reading Figure 2 The second accommodating shell 60 is located between the connecting end and the output end of the transmission shaft 20, and the second accommodating shell 60 covers the transmission assembly 32 therein to isolate the transmission assembly 32 from the external environment, which helps to protect the transmission assembly 32. At the same time, the second accommodating shell 60 separates the transmission assembly 32 from the second gear 21 to prevent the transmission assembly 32 and the second gear 21 from interfering with each other.

[0039] In one embodiment, the second accommodating shell 60 includes a third shell 61 and a fourth shell 62 , the second gear 21 is connected to the third shell 61 via a second deep groove ball bearing 63 , and the transmission shaft 20 is connected to the fourth shell 62 via a third deep groove ball bearing.

[0040] Similarly, the third housing 61 and the fourth housing 62 are detachably connected in the horizontal direction, which is convenient for inspection and maintenance of the transmission assembly 32 in the second accommodating shell 60. The second deep groove ball bearing 63 and the third deep groove ball bearing provide stable support for the second gear 21 and the transmission shaft 20, respectively, to ensure that the second gear 21 and the transmission shaft 20 rotate smoothly, and reduce the friction between the second gear 21 and the transmission shaft 20 and the second accommodating shell 60 during the rotation process.

[0041] In one embodiment, the first gear 11 and the second gear 21 are both bevel gears.

[0042] It can be understood that the vertical torsion of the torsion bar 10 is transmitted to the lateral rotation of the transmission rod through the meshing of the first gear 11 and the second gear 21. Since the bevel gear is suitable for applications that change the transmission direction, it can achieve high transmission efficiency and a larger transmission ratio in a smaller space, which contributes to the compact design of the angle steering gear.

[0043] The utility model also proposes a crane, which includes a steering wheel and an angle steering gear. The specific structure of the angle steering gear refers to the above-mentioned embodiment. Since the present crane adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here. Among them, the upper end of the torsion bar 10 of the angle steering gear is connected to the steering wheel. The steering of the steering wheel is provided with power assistance by the power assistance mechanism 30, which helps to provide precise control for the steering of the crane. In addition, since the angle steering gear proposed by the utility model has a compact structure and occupies a small space, it is convenient for the structural arrangement of the angle steering gear in the crane.

[0044] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An angle steering device for a crane, characterized in that: Used to assist the steering wheel of the crane in steering, the angle steering device comprises: A torsion bar, the torsion bar extends vertically, the upper end of the torsion bar is connected to the steering wheel and can be twisted under the drive of the steering wheel, and the lower end of the torsion bar is connected to the first gear; A transmission shaft, the transmission shaft extends in a horizontal direction, the two ends of the transmission shaft are a connecting end and an output end respectively, the connecting end is connected to a second gear, the second gear is meshed with the first gear, and the torsion bar can drive the transmission shaft to rotate along its axial direction through the first gear and the second gear when twisted; A power-assist mechanism, the power-assist mechanism comprising a motor and a transmission assembly, wherein the output shaft of the motor is connected to the output end of the transmission shaft through the transmission assembly, and the motor is used to drive the transmission assembly to drive the transmission shaft to rotate along its axial direction when the torsion bar is twisted; An angle sensor, the angle sensor is used to measure the torsion angle of the torsion bar; A control module is communicatively connected to the angle sensor, the motor and the speed sensor of the crane.

2. The angle steering device of a crane according to claim 1, characterized in that: The output shaft of the motor extends along the horizontal direction, and the transmission assembly includes a first pulley, a second pulley and a synchronous belt, the first pulley is arranged at the output end, the second pulley is arranged on the output shaft, and the synchronous belt is wound around the first pulley and the second pulley.

3. The angle steering device of a crane according to claim 2, characterized in that: An outer diameter of the first pulley is greater than an outer diameter of the second pulley.

4. The angle steering device of a crane according to claim 1, characterized in that: The angle steering device further includes a first accommodating shell, the angle sensor is disposed in the first accommodating shell, the torsion bar passes through the first accommodating shell, and the first gear is located below the first accommodating shell.

5. The angle steering device of a crane according to claim 4, characterized in that: The first containing shell includes a first shell and a second shell, and the first shell is located above the second shell, the torsion bar is sequentially inserted into the first shell and the second shell, and the torsion bar is connected to the first shell through a first deep groove ball bearing, and the torsion bar is connected to the second shell through a sliding bearing, the first gear is located below the second shell, and the first gear is connected to the second shell through an angular contact bearing.

6. The angle steering device of a crane according to claim 5, characterized in that: The first housing extends upward to form an extension portion, and the extension portion is connected to the torsion bar via an annular oil seal structure, and the oil seal structure is located above the first deep groove ball bearing.

7. The angle steering device of a crane according to any one of claims 1 to 6, characterized in that: The angle steering gear also includes a second accommodating shell, the transmission assembly is located in the second accommodating shell, the transmission shaft passes through the second accommodating shell, and the second gear is located outside the second accommodating shell.

8. The angle steering device of a crane according to claim 7, characterized in that: The second accommodating shell includes a third shell and a fourth shell. The second gear is connected to the third shell via a second deep groove ball bearing, and the transmission shaft is connected to the fourth shell via a third deep groove ball bearing.

9. The angle steering device of a crane according to any one of claims 1 to 6, characterized in that: The first gear and the second gear are both bevel gears.

10. A crane, characterized in that: The invention comprises a steering wheel and an angle steering device as claimed in any one of claims 1 to 9, wherein the upper end of the torsion bar of the angle steering device is connected to the steering wheel.

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