[0021] Hereinafter, the present invention will be explained in detail with reference to the drawings and embodiments.
[0022] Such as figure 1 The anti-rollback device of a crane with a variable center of gravity shown in the preferred embodiment of the present invention includes a support rod 1, a lower section boom 2 and a tower boom tip 3, the lower section boom 2 and the tower boom tip 3 pass through a first hinged end 4 articulated.
[0023] The support rod 1 includes a second hinged end 11 and a sliding end 12, and the second hinged end 11 is rotatably hinged with the lower section arm 2.
[0024] The tower arm tip 3 is provided with a slideway 31 and a groove 32. The sliding end 12 of the support rod 1 is in contact with the slideway 31 and can slide on the slideway 31. The groove 32 is provided between the sliding end 12 and the first hinge end 4, and the distance between the sliding end 12 and the first hinge end 4 is greater than or equal to the distance between the groove 32 of the tower arm tip 3 and the first hinge end 4.
[0025] The invention uses a support rod with one end hinged and one end clamped in the groove to fix the lower section arm and the tower arm tip, thereby preventing the lower section arm from tilting backward. Specifically, since the tip of the tower arm on the tower arm is in a substantially horizontal position during the installation state, the lower section arm and the tip of the tower arm are hinged to form an included angle, the present invention utilizes the hinged support with the lower section arm The gravity of the pole itself puts the sliding end of the support pole on the tip of the tower arm and slides freely on the tip of the tower arm.
[0026] When in use, the tip of the tower arm rotates gradually and is finally in a substantially vertical position. The angle between the lower section arm and the tip of the tower arm becomes larger. The sliding end that rests on the tip of the tower arm stays on the tower due to the gravity of the support rod. Slide on the tip of the arm to the groove on the tip of the tower arm so that the sliding end is stuck in the groove to prevent the lower section arm from tilting backward.
[0027] The invention has a simple structure and easy installation. Moreover, the gravity of the anti-backward tilting device is utilized, no additional energy is required, and the cost is saved.
[0028] Another example figure 2 As shown in the embodiment of the present invention, the crane anti-rollback device with a variable center of gravity further includes a center of gravity adjustment mechanism 5. The center of gravity adjustment mechanism 5 includes a sliding channel 6 closed at both ends and a slider 7 placed in the sliding channel. The sliding channel 6 includes a connecting end 61 and a raised end 62. The connecting end 61 is fixedly connected to the support rod 1.
[0029] Such as figure 2 As shown in the figure, when the sliding block 7 slides to the connecting end 61, the center of gravity of the support rod 1 and the center of gravity adjustment mechanism 5 is on the side of the vertical line where the second hinged end 11 is located relative to the tower arm tip 3, so that the support rod 1 wraps around Rotate counterclockwise with the viewing angle as shown in the picture, so that the support rod is more stable on the tip of the tower arm;
[0030] Another example image 3 As shown in the figure, when the slider 7 slides to the upturned end 62, due to the gravity of the slider 7, the center of gravity of the support rod 1 and the center of gravity adjustment mechanism 5 is at the other end of the vertical line where the second hinged end 11 is relative to the tip 3 of the tower arm. On one side, the support rod 1 is rotated in the clockwise direction as shown in the viewing angle, and the sliding end is separated from the groove 32, so that the lower section arm can be stowed and restored to the installed state. And with the tip of the tower arm 3 recovers like figure 2 In the horizontal position shown in the figure, the sliding block slides to the connecting end, and the support rod is firmly placed on the tip of the tower arm.
[0031] The invention utilizes the sliding of the sliding block in the center of gravity adjustment mechanism, adjusts the center of gravity of the support rod and the center of gravity adjustment mechanism, and makes the support rod tilt up, so that the support rod can escape the groove and restore the installation state. The invention uses the center of gravity adjustment mechanism to realize the installation and use of the anti-backward tilting device, has a simple structure, does not need to provide additional energy, and saves costs.
[0032] Such as Figure 4 As shown in the figure, the shape of the support rod 1 is a straight rod with a circular cross section. In other embodiments, the shape of the support rod 1 is also a straight rod with a rectangular cross section, as long as it can withstand the pressure caused by the backward tilt of the lower articulated arm, which is not limited in this embodiment.
[0033] Another example Figure 4 As shown in the figure, the shape of the sliding channel 6 is cylindrical. In other embodiments, the shape of the sliding channel may also be rectangular. As long as a smooth slide can be provided for the slider to be able to slide freely between the connecting end and the upturned end when the slider is shifted between the horizontal and vertical tip of the tower arm, this embodiment does not limit this.
[0034] Such as Figure 4 As shown in the figure, the shape of the slider 7 is spherical. Of course, in other embodiments, the shape of the slider may also be other shapes, such as a rectangular parallelepiped shape, as long as it can slide freely in the sliding channel, which is not limited in this embodiment.
[0035] In addition, such as Figure 4 As shown in the figure, the sliding channel 6 can be parallel to the support rod 1. Of course, in other embodiments, there may be a certain angle between the sliding channel and the support rod, as long as the support rod and the center of gravity adjustment mechanism are at the second hinge when the tower arm tip is level and the slider is placed at the connecting end. The end vertical line is opposite to the side of the tower arm tip, and when the tower arm tip is vertical and the sliding block is placed at the tilted end, the center of gravity of the support rod and the center of gravity adjustment mechanism is at the other end of the vertical line of the second hinged end relative to the tower arm tip. One side is sufficient, and this embodiment does not limit this.
[0036] Another example Figure 4 As shown in the figure, the anti-rollback device of the embodiment of the present invention may further include a second support rod 8 and a second center of gravity adjustment mechanism 9. The second support rod 8 and the second center of gravity adjustment mechanism 9 have the structure and function of the support rod 1 and the center of gravity adjustment mechanism 5, respectively. The second support rod 8 and the second center of gravity adjustment mechanism 9 are respectively fixedly connected to the support rod 1 and the center of gravity adjustment mechanism 5, and the second support rod 8 is hinged with the lower section arm. Providing a support rod and a center of gravity adjustment mechanism can increase the backward pressure that the anti-backward device of the present invention can withstand.
[0037] In addition, a crane according to an embodiment of the present invention includes the crane anti-rollback device with a variable center of gravity of the present embodiment as described above, thereby effectively preventing the risk of falling backward.
[0038] The specific embodiments of the present invention are described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions made to the utility are also within the scope of the present invention. Therefore, all equivalent changes and modifications made without departing from the spirit and scope of the present invention should all fall within the scope of the present invention.
