Crane and brake device of pull arm mechanism thereof

Abstract

The utility model relates to the field of cranes, in particular to a brake device of a pull arm mechanism of a crane. The brake device of the pull arm mechanism of the crane comprises a ratchet wheel which is coaxially connected to a winding drum of the pull arm mechanism and synchronously rotates along with the winding drum; the pawl is matched with the ratchet wheel; the elastic component abuts against the pawl, and the head end of the pawl tends to move towards the ratchet wheel under the elastic force effect of the elastic component so as to be embedded into the ratchet when the ratchet wheel rotates and block the ratchet wheel from rotating in the first direction. The driving assembly is connected with the pawl and used for driving the pawl to enable the head end of the pawl to move in the direction away from the ratchet wheel. And a braking mechanism that the ratchet wheel is matched with the pawl provides a braking protection measure for the operation of the crane drum, so that the safety of crane equipment is improved.

Description

Technical Field

[0001] This patent relates to the field of cranes, and particularly to a braking device for a boom pulling mechanism of a crane. Background Art

[0002] For the hoisting of high-rise buildings, tower cranes are often widely used. The boom pulling mechanism is a key component on a luffing jib tower crane. By rotating the drum of the boom pulling mechanism, the steel wire rope is wound up or released to pull the boom for pitching motion, realizing the luffing function of the tower crane.

[0003] The boom pulling mechanism bears the gravity of the boom and the load. Therefore, the safety performance of the brake of the boom pulling mechanism is crucial. In the prior art, hydraulic braking systems are usually relied on for braking. However, some emergencies may occur when using hydraulic braking systems. For example, the valve group in the hydraulic braking system fails to maintain pressure or the brake pads of the reducer are worn, which will pose safety hazards to the crane. Utility Model Content

[0004] To solve or at least partially solve the above technical problems, this patent provides a braking device for a boom pulling mechanism of a crane.

[0005] The first aspect of this patent provides a braking device for a boom pulling mechanism of a crane, including:

[0006] A ratchet wheel, coaxially connected to the drum of the boom pulling mechanism and rotating synchronously with the drum;

[0007] A pawl, arranged in cooperation with the ratchet wheel;

[0008] An elastic member, abutted against the pawl. The head end of the pawl tends to move towards the ratchet wheel under the elastic force of the elastic member, so as to embed into the ratchet teeth when the ratchet wheel rotates and block the rotation of the ratchet wheel in the first direction;

[0009] A driving assembly, connected to the pawl and used to drive the pawl to make the head end of the pawl move away from the ratchet wheel.

[0010] Optionally, in the braking device for a boom pulling mechanism of a crane as described above, the pawl includes:

[0011] A front arm, an intermediate section and a rear arm which are sequentially connected. The head end of the pawl is located at the end of the front arm;

[0012] The intermediate section is fixed by a first hinge shaft, so that the front arm and the rear arm rotate in the same clockwise direction with the first hinge shaft as the rotation center.

[0013] Optionally, in the braking device for a boom pulling mechanism of a crane as described above, the elastic member is a torsion spring, and the torsion spring is sleeved on the first hinge shaft and its two ends are respectively connected to the front arm and the rear arm.

[0014] Optionally, in the braking device of the crane boom pulling mechanism as described above, the driving assembly is connected to the rear arm, and the elastic member is connected to the portion between the driving assembly of the rear arm and the first hinge shaft;

[0015] The elastic member is a spring or a tension spring.

[0016] Optionally, in the braking device of the crane boom pulling mechanism as described above, the tail end of the pawl is located at the end of the rear arm, and the connection line between the first hinge shaft and the tail end of the pawl intersects with the connection line between the first hinge shaft and the head end of the pawl.

[0017] Optionally, in the braking device of the crane boom pulling mechanism as described above:

[0018] The elastic member is a tension spring and both the driving assembly and the elastic member are located on the same side of the rear arm;

[0019] Both the front arm and the rear arm of the pawl respectively have a bent section connected to the middle section and a straight section connected to the bent section. The bent sections of the front arm and the rear arm are bent in the same clockwise direction, so that the whole pawl presents a "Z" or "S" shape;

[0020] The straight section of the rear arm of the pawl gives way away from the elastic member and the driving assembly through the bent section to provide a space for arranging the elastic member and the driving assembly.

[0021] Optionally, the braking device of the crane boom pulling mechanism as described above further includes:

[0022] A support, at least two connecting portions are provided on the support, and each connecting portion is distributed in sequence from the direction close to the pawl to the direction away from the pawl;

[0023] One end of the elastic member is connected to the pawl, and the other end is detachably connected to one of the connecting portions.

[0024] Optionally, in the braking device of the crane boom pulling mechanism as described above,

[0025] The driving assembly includes a power source and a driving rod connected to the power source. The driving rod is connected to the rear arm through a second hinge shaft;

[0026] The support is welded to the chassis of the crane boom pulling mechanism and includes:

[0027] A hinge seat, the pawl is hinged on the hinge seat;

[0028] A mounting seat, the bottom of the power source is mounted on the support;

[0029] A connecting arm, the mounting seat and the hinge seat are connected by the connecting arm, and the connecting portions are arranged on the connecting arm along the length direction of the connecting arm;

[0030] The power source is one of an electric motor, an air compressor or a hydraulic press.

[0031] Optionally, in the braking device of the crane boom pulling mechanism as described above,

[0032] A plurality of through holes are circumferentially arranged on the ratchet wheel;

[0033] The braking device further includes:

[0034] A bolt and a columnar pin shaft, the bolt and the columnar pin shaft are alternately inserted into the through holes in sequence along the circumference of the ratchet wheel, and are connected to the side plate of the drum of the boom pulling mechanism, so that the ratchet wheel rotates synchronously with the drum.

[0035] The second aspect of this patent provides a crane, and the boom structure of the crane has the braking device described in the foregoing first aspect.

[0036] Compared with the prior art, the braking device arranged as above has the following technical effects:

[0037] A braking mechanism of a ratchet wheel cooperating with a ratchet pawl is added to the boom pulling mechanism of the crane. Compared with the prior art, an additional braking mechanism is added, which can timely brake the self-rotation of the drum caused by reasons such as power failure or failure of the equipment, and can greatly improve the safety performance of the equipment; BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of this patent, the relevant drawings will be briefly introduced below. It can be understood that the drawings in the following description are only used to illustrate some embodiments of this patent, and those of ordinary skill in the art can also obtain many other technical features and connection relationships not mentioned in this text based on these drawings.

[0039] Figure 1 is a three-dimensional schematic diagram of a crane boom pulling mechanism at the drum in an embodiment of this patent;

[0040] Figure 2 is a three-dimensional schematic diagram of a braking device of a crane boom pulling mechanism in an embodiment of this patent;

[0041] Figure 3 is an exploded schematic diagram of a braking device of a crane boom pulling mechanism in an embodiment of this patent;

[0042] Figure 4 is a three-dimensional schematic diagram of a ratchet pawl with a torsion spring in a braking device in an embodiment of this patent;

[0043] Figure 5 is a schematic diagram of the connection lines between the front end and the rear end of a ratchet pawl and a first hinge shaft respectively in an embodiment of this patent.

[0044] Description of the reference numerals:

[0045] A, braking device;

[0046] 1, ratchet wheel; 11, through hole; 12, bolt; 13, columnar pin shaft;

[0047] 2, ratchet pawl; 21, front arm; 22, middle section; 23, rear arm; 24, bent section;

[0048] 3, elastic member; 31, torsion spring; 32, tension spring;

[0049] 4, driving assembly; 41, power source; 42, driving rod; 43, second hinge shaft;

[0050] 5, support; 51, connecting portion; 52, hinge seat; 53, mounting seat; 54, connecting arm;

[0051] 6, chassis;

[0052] 7, drum;

[0053] 8, first hinge shaft. Detailed implementation manners

[0054] The present patent will be described in detail below with reference to the accompanying drawings.

[0055] Embodiment 1

[0056] In a lifting device, the boom pulling mechanism bears the tensile force generated by the boom and the lifted object due to gravity. Therefore, the safety performance of the brake of the boom pulling mechanism is crucial. After observation and calculation by the inventor, it is found that the brake of the boom pulling mechanism needs to be provided with a safety brake that can be controlled by an operator or an overspeed protection switch and directly acts on the end of the transmission chain (the wire rope drum) to prevent the support brake from failing and reduce the occurrence of accidents caused by damage to the transmission chain, and to provide braking when replacing or repairing the motor, the transmission device and the support brake.

[0057] For this purpose, the present embodiment provides a braking device for a crane boom pulling mechanism. Specifically, referring to Figure 1 and Figure 2 as shown, the braking device A includes:

[0058] A ratchet wheel 1, coaxially connected to the drum 7 of the boom pulling mechanism and rotating synchronously with the drum 7;

[0059] A ratchet pawl 2, arranged in cooperation with the ratchet wheel 1;

[0060] An elastic member 3, abutted against the ratchet pawl 2. The head end of the ratchet pawl 2 tends to move towards the ratchet wheel 1 under the elastic force of the elastic member 3, so as to embed into the ratchet teeth when the ratchet wheel 1 rotates and block the rotation of the ratchet wheel 1 in the first direction;

[0061] A driving component 4, connected to the pawl 2, is used to drive the pawl 2 so that the head end of the pawl 2 moves away from the ratchet wheel 1.

[0062] The ratchet wheel 1 and the pawl 2 cooperate to form a one-way intermittent motion mechanism. The head end of the pawl 2 tends to move towards the ratchet wheel 1 under the elastic force of the elastic component 3 so that the pawl 2 can abut against the ratchet teeth.

[0063] When the ratchet wheel 1 tends to rotate in the first direction, the pawl 2 abuts in the tooth groove between the ratchet teeth and prevents the ratchet wheel 1 from continuing to rotate. When the ratchet wheel 1 tends to rotate in the second direction, that is, the reverse direction of the first direction, the pawl 2 can slide over the back of the ratchet teeth of the ratchet wheel 1 without obstruction, so that the ratchet wheel 1 rotates in one direction.

[0064] When it is again necessary for the ratchet wheel 1 to rotate in the first direction, the driving component 4 connected to the pawl 2 drives the head end of the pawl 2 to move away from the ratchet wheel 1. The pawl 2 disengages from the tooth groove between the ratchet teeth and disengages from the ratchet wheel 1. The ratchet wheel 1 can continue to rotate in the first direction and drive the coaxial drum 7 to rotate together to drive the pull arm mechanism to continue to operate.

[0065] The above-mentioned first direction and second direction refer to the clockwise or counterclockwise direction.

[0066] The braking device A set as above has the following technical effects:

[0067] A braking mechanism in which the ratchet wheel 1 and the pawl 2 cooperate is added to the pull arm mechanism of the crane. Compared with the prior art, an additional braking mechanism is added, which can timely brake the self-rotation of the drum 7 caused by reasons such as power failure or failure of the equipment, and greatly improves the safety performance of the equipment.

[0068] The second aspect of this embodiment discloses a crane, and the pull arm structure of the crane has the aforementioned braking device A.

[0069] For the crane applying the aforementioned braking device A, thanks to the added braking mechanism of the ratchet wheel 1 and the pawl 2, the safety performance of the equipment operation can be further improved.

[0070] Embodiment Two

[0071] This embodiment is a further improvement based on the first embodiment. The improvement of this embodiment lies in that the structure of the pawl 2 is improved, and the elastic component 3 or the driving component 4 can use the lever principle to rotate the pawl 2.

[0072] Specifically, referring to Figure 2 、 Figure 3 As shown, the pawl 2 of the braking device A of the pull arm mechanism of the crane includes:

[0073] The forearm 21, the middle section 22, and the rear arm 23 are sequentially connected. The head end of the pawl 2 is located at the end of the forearm 21.

[0074] The middle section 22 is fixed by a first hinge shaft 8, enabling the forearm 21 and the rear arm 23 to rotate in the same clockwise direction with the first hinge shaft 8 as the rotation center.

[0075] The pawl 2 can rotate around the first hinge shaft 8

[0076] The forearm 21, the middle section 22, and the rear arm 23 are sequentially connected. That is to say, the middle section 22 can be connected to the forearm 21 on one side and the rear arm 23 on the opposite side of the forearm 21. The head end of the pawl 2 is located at the end of the forearm 21.

[0077] A through hole 11 can be provided on the middle section 22 to enable the first hinge shaft 8 to pass through the through hole 11 to fix the middle section 22. At the same time, the middle section 22 can rotate around the first hinge shaft 8.

[0078] It is easily understandable that the forearm 21 and the rear arm 23 connected to the middle section 22 form a lever structure. When an external force is applied to the rear arm 23 of the pawl 2, it can cause the middle section 22 to drive the forearm 21 to rotate in the same clockwise direction simultaneously. When the rear arm 23 of the pawl 2 is externally forced to rotate, the forearm 21 of the pawl 2 will rotate accordingly. Compared with taking one end of a rod as the rotation center, in this embodiment, the pawl 2 using the lever principle greatly reduces the rotation resistance. By applying a driving force to the rear arm 23 to change the movement of the forearm 21, the control of the driving force on the head end of the pawl 2 can be made more flexible. At the same time, the rotation angle of the pawl 2 can be better controlled.

[0079] Optionally, referring to Figure 4 As shown, the elastic member 3 of the braking device A is a torsion spring 31. The torsion spring 31 is sleeved on the first hinge shaft 8 and its two ends are respectively connected to the forearm 21 and the rear arm.

[0080] The elastic member 3 can adopt a torsion spring 31. The torsion spring 31 is sleeved on the first hinge shaft 8. The force arms provided at both ends of the torsion spring 31 are connected to the forearm 21 at one end and the rear arm 23 at the other end. Under the action of the torsion force of the torsion spring 31, the pawl 2 tends to move towards the direction close to the ratchet 1. When the pawl 2 is away from the ratchet 1, the elastic potential energy of the torsion spring 31 increases, and the elastic force applied to the forearm 21 and the rear arm 23 increases accordingly, making the pawl 2 more tend to move towards the ratchet 1 direction. Using the torsion spring 31 as the elastic member 3 not only plays a good adjustment role for the pawl 2, but also has a simple and compact structure, is convenient for arrangement, has a light suspension mass, and does not require lubrication.

[0081] Optionally, referring to Figure 2 and 3As shown, the drive assembly 4 of the braking device A is connected to the rear arm 23, and the elastic member 3 is connected to the portion between the drive assembly 4 of the rear arm 23 and the first hinge shaft 8.

[0082] The drive assembly 4 is connected to the rear arm 23 of the pawl 2. The drive assembly 4 drives the rear arm 23 of the pawl 2 to rotate around the first hinge shaft 8, enabling its front arm 21 to move away from the ratchet wheel 1. When the front end of the front arm 21 disengages from the tooth groove on the ratchet wheel 1, the ratchet wheel 1 can smoothly rotate in the first direction. In addition, the position of the elastic member 3 can be set at the portion between the first hinge shaft 8 and the rear arm 23, and an elastic force can be applied to the rear arm 23, enabling the rear arm 23 to drive the front arm 21 to move towards the ratchet wheel 1.

[0083] From the perspective of force, the rear arm 23 is the force arm in the lever structure. The elastic member 3 is arranged between the first hinge shaft 8 and the drive assembly 4, and the elastic member 3 is arranged at a position relatively closer to the lever center with respect to the drive assembly 4. That is to say, the force arm of the elastic force of the elastic member 3 is smaller than the force arm of the driving force provided by the drive assembly 4. With such an arrangement, the drive assembly 4 can drive the pawl 2 to rotate by overcoming the elastic force of the elastic member 3 with a relatively small driving force, which can reduce the performance requirements of the equipment and save energy.

[0084] Embodiment 3

[0085] This embodiment is a further improvement based on the first embodiment. The improvement of this embodiment lies in that the structural shape of the pawl 2 is improved to be approximately in the shape of an "S" or a "Z", enabling it to better brake the ratchet wheel 1 to reduce interference, and at the same time, it can also reserve space for the elastic member 3 and the drive assembly 4 connected to the pawl 2.

[0086] Optionally, referring to Figure 2 and Figure 3 As shown, in the braking device A, the tail end of the pawl 2 is located at the end of the rear arm 23, and the connection line between the first hinge shaft 8 and the tail end of the pawl 2 intersects with the connection line between the first hinge shaft 8 and the head end of the pawl 2.

[0087] The connection line between the first hinge shaft 8 and the tail end of the pawl 2 intersects with the connection line between the first hinge shaft 8 and the head end of the pawl 2, and the front arm 21 and the rear arm 23 of the pawl 2 can be adjusted accordingly according to other structures of the braking device A.

[0088] Optionally, referring to Figures 2 to 4As shown, the elastic member 3 of the braking device A is a tension spring 32, and both the driving assembly 4 and the elastic member 3 are located on the same side of the rear arm 23. The front arm 21 and the rear arm 23 of the pawl 2 each have a bent section 24 connected to the middle section 22 and a straight section connected to the bent section 24. The bent sections 24 of the front arm 21 and the rear arm 23 are bent in the same clockwise direction, so that the pawl 2 as a whole presents a "Z" or "S" shape. The straight section of the rear arm 23 of the pawl 2 is displaced away from the elastic member 3 and the driving assembly 4 through the bent section 24 to provide a space for arranging the elastic member 3 and the driving assembly 4.

[0089] The elastic member 3 can be set as a tension spring 32. While having an elastic force in the axial direction, the tension spring 32 has a simple structure, is easy to disassemble, install and replace, and can continuously provide an elastic force while the pawl 2 is rotating.

[0090] As can be seen from Figure 4 In the figure, there is a certain bent part at the connection between the rear arm 23 of the pawl 2 and the middle section 22, that is, the bent section 24. The bent section 24 reserves a certain space and at the same time reserves enough space for arranging the elastic member 3 and the driving assembly 4. The straight section of the rear arm 23 is connected to the bent section 24, which can provide a connection point for the connection of the elastic member 3 and the driving assembly 4. Opposite to the rear arm 23, the front arm 21 also has a bent section 24 connected to the middle section 22 and a straight section connected to the bent section 24. The bent section 24 of the front arm 21 is correspondingly arranged with the bent section 24 of the rear arm 23, so that the pawl 2 as a whole presents a "Z" shape or an "S" shape.

[0091] The specific process of the relative movement or braking between the pawl 2 and the ratchet wheel 1 is as follows:

[0092] When the drum 7 rotates in the second direction, the ratchet wheel 1 rotates in the second direction together with the drum 7. During the rotation of the ratchet wheel 1, the back of the ratchet tooth slides over the pawl 2, or the rear arm 23 of the pawl 2 is driven by the driving assembly 4 to move the front arm 21 away from the ratchet wheel 1 so that it does not come into contact with the ratchet tooth, enabling the ratchet wheel 1 to rotate smoothly in the second direction.

[0093] When the rear arm 23 of the pawl 2 is driven by the driving assembly 4 to move the front arm 21 away from the ratchet wheel 1, the ratchet wheel 1 is not braked by the pawl 2, and the ratchet wheel 1 and the drum 7 can rotate together in the first direction.

[0094] When the movement of the ratchet wheel 1 and the drum 7 in the first direction needs to be braked, the drive assembly 4 stops driving the rear arm 23 of the pawl 2. The rear arm 23 rotates under the action of the elastic force of the elastic member 3 and drives the front arm 21 to move towards the ratchet wheel 1. If the ratchet wheel 1 is rotating in the first direction, the front end of the pawl 2 will abut between the first tooth groove and the tooth groove of the next tooth after contacting the first tooth, thereby generating a resistance to the ratchet wheel 1 and preventing the ratchet wheel 1 from continuing to move in the first direction, thus generating braking;

[0095] Since the pawl 2 as a whole presents a "Z" shape or an "S" shape, the bent section 24 of the front arm 21 of the pawl 2 can enable the straight section of the front arm 21 to cut into the tooth groove between the teeth in a posture away from the teeth, so as to ensure that the front end of the pawl 2 can first contact the teeth and smoothly enter between the tooth grooves, and at the same time prevent the front arm 21 from interfering with the ratchet wheel 1. On the contrary, the bent part of the rear arm 23 can reserve space for the installation of the elastic member 3 and the drive assembly 4.

[0096] The braking device A arranged as above has the following technical effects:

[0097] 1. Compared with the linear structure, the pawl 2 designed as an "S" shape or a "Z" shape has higher bending stiffness and bearing capacity, so that the overall structural strength of the pawl 2 can be improved, the load can be effectively shared, and the structural effect of light weight and high strength can be achieved.

[0098] 2. The bent section 24 of the front arm 21 can enable the front arm 21 to enter and abut between the tooth grooves on the ratchet wheel 1 in a posture away from the ratchet wheel 1, avoiding unnecessary interference between the ratchet wheel 1 and the teeth, reducing the probability of failure, and improving the overall safety of the braking device A.

[0099] 3. The bent section 24 of the rear arm 23 can reserve enough space for the arrangement of the elastic member 3 and the drive assembly 4, so that the drive assembly 4 and the elastic member 3 can directly apply the same-direction acting force in the rotation direction of the pawl 2, avoiding the use of a transmission mechanism, and making the overall structure of the pawl 2, the elastic member 3 and the drive assembly 4 more compact.

[0100] Optionally, as shown in Figure 2 the braking device A further includes:

[0101] A support 5, on which at least two connecting parts 51 are arranged, and each connecting part 51 is distributed in sequence from the direction close to the pawl 2 to the direction away from the pawl 2;

[0102] One end of the elastic member 3 is connected to the pawl 2, and the other end is detachably connected to one of the connecting parts 51.

[0103] The setting support 5 can be used to select and install any one or more or all of the pawl 2, the elastic member 3, and the drive assembly 4. For example, when there is enough space on the support 5, the pawl 2, the elastic member 3, and the drive assembly 4 can be installed on the support 5 together; however, when the space of the support 5 is compressed due to environmental restrictions, the drive assembly 4 can be installed elsewhere outside the support 5, and a transmission mechanism is added to transmit the driving force of the drive assembly 4 to the pawl 2.

[0104] The connecting portion 51 serves as an installation position and can connect one end of the elastic member 3. The other end of the elastic member 3 is connected to the pawl 2 and provides an elastic force for the pawl 2 so that the pawl 2 can rotate relative to the support 5. At least two connecting portions 51 of the support 5 are sequentially distributed from the direction close to the pawl 2 to the direction away from the pawl 2. In the case where the elastic member 3 is already provided, the drive assembly 4 can also be connected to the connecting portion 51 so that the drive assembly 4 can drive the pawl 2 to move relative to the support 5 and move the pawl 2 away from the ratchet wheel 1.

[0105] In an alternative embodiment, a plurality of elastic members 3 can be provided and a plurality of connecting portions 51 corresponding to the number of the elastic members 3 are added. One ends of the plurality of elastic members 3 can be correspondingly connected to the pawl 2, and the other ends are detachably connected to the plurality of connecting portions 51 respectively. The plurality of elastic members 3 can provide sufficient elastic force for the pawl 2 so that the pawl 2 can abut against the ratchet wheel 1 more stably during braking.

[0106] Embodiment Four

[0107] This embodiment is a further improvement based on the third embodiment. The improvement of this embodiment lies in that the structure of the bracket is further improved so that it can also carry the power source 41 of the pawl 2 and the drive assembly 4 at the same time, making the overall structure of the braking mechanism more compact.

[0108] Specifically, referring to Figure 2 and Figure 3 As shown, the drive assembly 4 of the braking device A includes a power source 41 and a drive rod 42 connected to the power source 41. The drive rod 42 is connected to the rear arm 23 through a second hinge shaft 43;

[0109] The support 5 is welded to the chassis 6 of the crane boom mechanism and includes:

[0110] A hinge seat 52, and the pawl 2 is hinged on the hinge seat 52;

[0111] A mounting seat 53, and the bottom of the power source 41 is mounted on the support 5;

[0112] A connecting arm 54, the mounting seat 53 and the hinge seat 52 are connected through the connecting arm 54, and the connecting portion 51 is arranged on the connecting arm 54 along the length direction of the connecting arm 54;

[0113] The power source 41 can be one of an electric motor, an air compressor or a hydraulic press.

[0114] The driving assembly 4 further includes a power source 41 and a driving rod 42 connected to the power source 41. The second hinge shaft 43 can be arranged on the rear arm 23, and the driving rod 42 is hinged to a second hinge rod on the rear arm 23, or the second hinge shaft 43 can be arranged on the driving rod 42, and the rear arm 23 is connected to the driving rod 42 through the second hinge shaft 43. Driven by the power source 41, the driving rod 42 drives the rear arm 23 hinged thereto to rotate, so as to further drive the front arm 21 connected to the rear arm 23 through the middle section 22 to move away from the ratchet 1, releasing the braking state of the ratchet 1.

[0115] The support 5 can be welded to the chassis 6 of the pulling arm mechanism. In an alternative embodiment, the support 5 can also be mounted on the chassis 6 of the pulling arm mechanism by bolts 12. The support 5 includes a hinge seat 52, a mounting seat 53 and a connecting arm 54. The pawl 2 is mounted on the hinge seat 52. The hinge seat 52 can be arranged closer to the ratchet 1 relative to the mounting seat 53, so that the power source 41 mounted on the mounting seat 53 does not interfere with the pawl 2. The connecting arm 54 connects the hinge seat 52 and the mounting seat 53. The connecting portion 51 is arranged on the connecting arm 54 along the length direction of the connecting arm 54. The elastic members 3 can be sequentially arranged on the connecting arm 54, and the number of the connecting portions 51 corresponds to the number of the elastic members 3.

[0116] Different types of power sources 41 can be applied according to specific application scenarios. Specifically:

[0117] 1. The pneumatic drive of the air compressor has good overload protection ability, can withstand large impacts and vibrations, and can also buffer the impact force generated when the pawl 2 is caught between the ratchet teeth of the ratchet 1 to a certain extent in some scenarios.

[0118] 2. The hydraulic drive of the hydraulic motor has a fast response speed and is suitable for high-speed and high-precision application scenarios. Moreover, the hydraulic motor can withstand large loads and torques and can quickly and accurately drive the pawl 2 to rotate to a preset position.

[0119] 3. The control method of the electric motor drive is flexible, and various motion modes and motion control algorithms can be realized. The electric motor has high control precision, can achieve precise speed and position control; has high transmission efficiency and small energy loss; does not require liquid and gas media, and is more environmentally friendly, safe and clean.

[0120] Embodiment Five

[0121] This embodiment is a further improvement based on the first to fourth embodiments. The improvement of this embodiment lies in that the structure of the ratchet wheel 1 is further improved, and a through hole 11 is added, which can be firmly installed on the side plate of the drum 7 under the connection of the bolt 12 and the pin shaft, and rotates in the same direction therewith.

[0122] Specifically, referring to Figure 2 As shown, a plurality of through holes 11 are circumferentially arranged on the ratchet wheel 1 of the braking device A;

[0123] The braking device A further includes:

[0124] A bolt 12 and a columnar pin shaft 13, the bolt 12 and the columnar pin shaft 13 are alternately inserted into the through holes 11 in sequence along the circumference of the ratchet wheel 1 and are connected to the side plate of the drum 7 of the pull arm mechanism, so that the ratchet wheel 1 rotates synchronously with the drum 7.

[0125] A plurality of through holes 11 are circumferentially arranged on the ratchet wheel 1, so that the bolt 12 and the columnar pin shaft 13 can be inserted into the through holes 11 to fix the ratchet wheel 1 on the side plate of the drum 7. In an alternative embodiment, a plurality of through holes 11 can be uniformly arranged at the same angle intervals in the circumferences of different radii, that is, through holes 11 can be opened on the circumference of a certain radius of the ratchet wheel 1 close to the rotation center, and through holes 11 can be opened on the circumference of another radius close to the ratchet teeth, forming two inner and outer circles of through holes 11 on the side of the ratchet wheel 1. After the bolt 12 and the columnar pin shaft 13 are inserted into the through holes 11, the ratchet wheel 1 can be more firmly fixed on the drum 7, so that the ratchet wheel 1 rotates synchronously with the drum 7.

[0126] Finally, it should be noted that those of ordinary skill in the art can understand that in order to enable readers to better understand this patent, many technical details are proposed in the embodiments of this patent. However, even without these technical details and various changes and modifications based on the above embodiments, the technical solutions required to be protected by the claims of this patent can be basically realized. Therefore, in practical applications, various changes can be made to the above embodiments in form and details without departing from the spirit and scope of this patent.

Claims

1. A braking device for a crane's boom pulling mechanism, characterized in that, Comprising: A ratchet wheel, coaxially connected to the drum of the pulling arm mechanism and rotating synchronously with the drum; A pawl, arranged in cooperation with the ratchet wheel; An elastic member, abutted against the pawl, the head end of the pawl tending to move towards the ratchet wheel under the elastic force of the elastic member so as to be embedded in the ratchet teeth when the ratchet wheel rotates and block the rotation of the ratchet wheel in the first direction; A driving assembly, connected to the pawl and used for driving the pawl to make the head end of the pawl move away from the ratchet wheel.

2. The braking device of the crane boom pulling mechanism according to claim 1, characterized in that, The pawl includes: A front arm, an intermediate section and a rear arm connected in sequence, the head end of the pawl being located at the end of the front arm; The intermediate section is fixed by a first hinge shaft so that the front arm and the rear arm rotate in the same clockwise direction with the first hinge shaft as the rotation center.

3. The braking device of the crane boom pulling mechanism according to claim 2, characterized in that, The elastic member is a torsion spring, the torsion spring is sleeved on the first hinge shaft, and the two ends are respectively connected to the front arm and the rear arm.

4. The braking device of the crane boom pulling mechanism according to claim 2, characterized in that, The driving assembly is connected to the rear arm, and the elastic member is connected to the part between the driving assembly and the first hinge shaft on the rear arm; The elastic member is a spring or a tension spring.

5. The braking device of the crane boom pulling mechanism according to claim 4, characterized in that, The tail end of the pawl is located at the end of the rear arm, and the connection line between the first hinge shaft and the tail end of the pawl intersects with the connection line between the first hinge shaft and the head end of the pawl.

6. The braking device of the crane boom pulling mechanism according to claim 5, characterized in that, The: The elastic member is a tension spring and both the driving assembly and the elastic member are located on the same side of the rear arm; Both the front arm and the rear arm of the pawl respectively have a bent section connected to the intermediate section and a straight section connected to the bent section, and the bent sections of the front arm and the rear arm are bent in the same clockwise direction so that the whole pawl presents a "Z" or "S" shape; The straight section of the rear arm of the pawl gives way towards the direction away from the elastic member and the driving assembly through the bent section to provide a space for arranging the elastic member and the driving assembly.

7. The braking device of the crane pulling arm mechanism according to claim 6, characterized in that The braking device further includes: A support, at least two connecting parts are arranged on the support, and each of the connecting parts is distributed in sequence from the direction close to the pawl towards the direction away from the pawl; One end of the elastic member is connected to the pawl, and the other end is detachably connected to one of the connecting parts.

8. The braking device of the crane pulling arm mechanism according to claim 7, characterized in that The driving assembly includes a power source and a driving rod connected to the power source, and the driving rod is connected to the rear arm through a second hinge shaft; The support is welded to the chassis of the crane pulling arm mechanism and includes: A hinge seat, the pawl is hinged on the hinge seat; A mounting seat, the bottom of the power source is mounted on the support; A connecting arm, the mounting seat and the hinge seat are connected by the connecting arm, and the connecting parts are arranged on the connecting arm along the length direction of the connecting arm; The power source is one of a motor, an air compressor or a hydraulic press.

9. The braking device of the crane's boom pulling mechanism according to any one of claims 1 to 8, characterized in that a plurality of through holes are circumferentially arranged on the ratchet wheel; the braking device further includes: a bolt and a columnar pin shaft, the bolt and the columnar pin shaft are alternately inserted into the through holes in sequence along the circumference of the ratchet wheel and connected to the side plate of the drum of the boom pulling mechanism, so that the ratchet wheel rotates synchronously with the drum.

10. A crane, characterized in that, The boom structure of the crane has the braking device according to any one of claims 1 to 9.

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