Lifting beam anti-drop device

Abstract

The present invention relates to the technical field of tower cranes, and specifically discloses a lifting beam anti-slip device, comprising an anti-slip plate, the anti-slip plate is rotatably connected to the lifting beam body, the anti-slip plate comprises a connecting section and an abutting section that are fixedly connected to each other, the connecting section is rotatably connected to the lifting beam body, a torsion spring is arranged between the connecting section and the lifting beam body, and the abutting section can abut against the bottom surface of the step. This scheme is used to solve the problem of potential safety hazards existing in tower cranes without anti-slip structures in the prior art, and the problem of cumbersome operation and easy failure of anti-slip in tower cranes with anti-slip structures.

Description

Technical Field

[0001] The invention relates to the technical field of tower cranes, in particular to a jacking beam anti-dropping device. Background Art

[0002] When installing a tower crane, it is necessary to use a jacking frame to install the standard section into the existing tower body to complete the assembly of the tower body. An installation platform is fixed outside the jacking frame to facilitate manual standing and operation. The jacking frame is provided with movable climbing claws. At the same time, the jacking frame is connected to the jacking beam through a hydraulic piston cylinder. The jacking beam is fixedly connected to the piston rod of the hydraulic piston cylinder. When the jacking frame is working, the jacking beam needs to be inserted into the receiving groove of the standard section step, and the jacking beam is used as the support of the entire jacking frame, and then the hydraulic piston is started. The cylinder extends the piston rod, and lifts up the jacking sleeve and the upper part of the tower crane fixed to the jacking sleeve at the same time. When the jacking sleeve rises to the point where the movable climbing claw rests on the upper step of the standard section, the movable climbing claw is supported by the step, and then the hydraulic piston cylinder is retracted, so that the piston rod drives the jacking beam upward until the jacking beam is placed in the receiving groove of a step again, and then the above actions are repeated to complete the jacking of the jacking sleeve. During the jacking process, the standard section to be installed is guided to the tower body by the introduction beam provided on the jacking sleeve.

[0003] During the installation of existing tower cranes, the steps of traditional standard sections are only provided with receiving grooves for placing the jacking beams, and there are no restrictions on the upper and lower positions of the jacking beams. However, in actual use, the jacking beams may not be accurately placed in the receiving grooves of the steps for jacking work. At this time, due to the inaccurate placement of the jacking beams and the huge force on the jacking beams (bearing the weight of the jacking frame and the upper part of the tower crane), it is easy for the jacking beams to slip off the steps, thereby causing a safety accident in which the jacking frame falls as a whole.

[0004] In order to solve the problem of potential safety hazard, in the prior art, an anti-slip structure is added to the tower crane. One way is to add an anti-slip structure to the jacking beam without changing the existing standard section, such as welding bolts on the jacking beam, and then connecting a threaded anti-slip plate to the bolt. When in use, after the jacking beam is placed in the accommodating groove of the step, the anti-slip plate is manually screwed so that the anti-slip plate is pressed against the bottom of the step, and then the anti-slip plate is pressed against the bottom surface of the step with a nut. In this way, although an anti-slip structure is added to the existing tower crane, the operation is troublesome because the threads need to be tightened. In addition, during the jacking operation, the nuts are frequently tightened and loosened on the bolts, which can easily cause the threads to slip and completely lose the anti-slip function.

[0005] Another way can completely solve the problem of the above-mentioned way, specifically: open an anti-drop hole on each step of the standard section, connect a movable locking pin to the lifting beam, and during the lifting process, when the lifting beam is placed in the receiving groove of the step, whether or not the lifting operation is performed, it is required to manually insert the movable locking pin into the anti-drop hole of the step, and then rotate the movable locking pin to lock the position of the movable locking pin to achieve the anti-drop function. However, in the existing anti-drop structure, because there are multiple standard sections installed on the tower body each time, each standard section has a step, and the lifting beam will act on each step in turn along the height of the tower body, making the process of achieving anti-drop becomes cumbersome, and after the cumbersome work, the operator is likely to forget to insert the movable locking pin into the anti-drop hole, resulting in the problem of anti-drop failure. Summary of the invention

[0006] The present invention aims to provide a lifting beam anti-slip device to solve the potential safety hazard problems existing in tower cranes without anti-slip structures in the prior art, and the problems of cumbersome operation and easy failure of anti-slip structures existing in tower cranes with anti-slip structures.

[0007] In order to achieve the above object, the basic scheme of the present invention is as follows:

[0008] The anti-slip device of the jacking beam comprises an anti-slip plate, which is rotatably connected to the jacking beam body. The anti-slip plate comprises a connecting section and an abutting section which are fixedly connected to each other. The connecting section is rotatably connected to the jacking beam body. A torsion spring is provided between the connecting section and the jacking beam body, and the abutting section can abut against the bottom surface of the step.

[0009] Compared with the prior art, the following are the beneficial effects:

[0010] When this solution is adopted, before the lifting beam body is placed on the step, the anti-slip plate is manually rotated to a certain angle (at this time, the torsion spring is pressed and elastic potential energy is accumulated) to facilitate the lowering of the lifting beam body onto the step. When the lifting beam body is placed in the accommodating groove of the step, since a torsion spring is provided between the connecting section and the lifting beam body, under the action of the elastic potential energy of the torsion spring, the abutting section fixed to the connecting section is automatically able to abut against the bottom surface of the step, and the accommodating groove of the step is located on the top surface of the step. Therefore, the anti-slip device of this solution limits the upper and lower positions of the lifting beam body from the step, solves the anti-slip problem in the prior art caused by the lack of anti-slip holes on the step, and avoids the cost increase caused by adding anti-slip holes on the step of each standard section to achieve the anti-slip function.

[0011] In the present solution, after the lifting beam body is placed in the step receiving groove, the anti-drop plate will automatically rest against the bottom surface of the step under the elastic force of the torsion spring. This process does not require manual operation, thereby avoiding the situation in the prior art where the movable locking pin needs to be manually inserted into the anti-drop hole to achieve the anti-drop function. It also avoids the problem of anti-drop failure caused by manual forgetting to insert the movable locking pin into the anti-drop hole, thereby improving safety.

[0012] In addition, in the present solution, the anti-slip plate does not require manual operation, that is, the elastic force of the torsion spring can force the anti-slip plate to automatically prevent the lifting beam body from slipping off. Compared with the prior art that requires screwing nuts or inserting movable locking pins, the operation of the present solution is simpler, which is beneficial to reducing the intensity of manual operation and saving labor costs.

[0013] Furthermore, the connecting section and the lifting beam body are located on both sides of the step.

[0014] Beneficial effect: When adopting this scheme, because the steps of each standard section are arranged horizontally in pairs, the anti-slip device of this device is also installed in pairs on the lifting beam body. In this scheme, the connecting section and the lifting beam body are located on both sides of the steps, while in actual application, the lifting beam body is located between the paired steps, that is, the anti-slip device fastens the lifting beam body to the steps from the outside of the lifting beam body, so that the anti-slip device cooperates with the lifting beam body to achieve upper and lower limit of the lifting beam body, and also performs horizontal limit. In addition to being facilitating the anti-slip of the lifting beam body, it can also reduce the risk of overturning of the upper part of the tower crane.

[0015] Furthermore, a guiding portion is provided at the bottom of the abutting section, and the guiding portion is a curved surface or an inclined surface, and the guiding portion can contact the upper edge of the step.

[0016] The anti-slip plate loses the obstruction of the step and rotates toward the side of the lifting beam under the action of the elastic potential energy of the torsion spring, and then fastens the bottom surface of the step, completing the automatic anti-slipping of the anti-slip device. Compared with the prior art which requires manual operation of the movable locking pin or manual screwing of the nut to achieve anti-slipping, the anti-slipping function of this solution is automatically achieved by the action of lifting the crossbeam body and placing it into the step, which further reduces the manual operation cost and automatically achieves anti-slipping, completely avoiding the safety hazards caused by manual forgetting to perform the anti-slipping operation, and is conducive to improving the installation efficiency of the tower crane.

[0017] Furthermore, a plurality of rollers are provided on the guide portion.

[0018] Beneficial effect: By setting the roller, the sliding friction between the guide part and the step is changed into rolling friction during the guiding process of the anti-slip plate, thereby achieving the improvement of the guiding effect while reducing the wear of the contact position.

[0019] Furthermore, the end of the guide portion away from the connecting section exceeds the end of the abutting section.

[0020] Beneficial effect: When this solution is adopted, because the end of the guide part exceeds the end of the abutment section, when the anti-slip plate moves downward with the lifting beam body to be placed on the step, the anti-slip plate relies on the guide part to contact the side of the step, thereby reducing the wear of the abutment section on the anti-slip plate during the downward movement of the anti-slip plate.

[0021] Furthermore, a wedge surface is provided at one end of the abutting section away from the connecting section, and the distance between the upper end of the wedge surface and the connecting section is smaller than the distance between the lower end of the wedge surface and the connecting section.

[0022] Beneficial effect: When this solution is adopted, through the setting of the wedge surface, after the guide part of the anti-slip plate moves to the bottom of the step, the wedge surface of the abutment section contacts the edge of the bottom surface of the step to generate sliding friction. Compared with the sliding friction of the abutment section on the side of the step, it avoids the wear on the side of the step when the anti-slip plate is about to complete its anti-slip function.

[0023] Furthermore, a wear-resistant portion is detachably connected to the abutting section, and the wear-resistant portion can abut against the bottom surface of the step.

[0024] Beneficial effect: In actual application, because the anti-slip plate is about to complete automatic anti-slip and is fastened to the bottom of the step (at this time, the lifting beam has partially entered the accommodating groove of the step and continues to move downward), the bottom edge of the step and the upper surface of the abutment section are in friction contact, making the upper surface of the abutment section more susceptible to wear. This solution provides a detachable wear-resistant portion at the location where the abutment section is prone to wear. On the one hand, it reduces the number of times the abutment section is replaced due to wear; on the other hand, the detachable connection method is used to reduce the difficulty of replacement operation.

[0025] Furthermore, after the abutting section abuts against the step, the connecting section and the step can be parallel to each other.

[0026] Beneficial effect: When the present solution is adopted, through the parallel setting, the operator can intuitively judge whether the anti-drop plate fails to abut against the step by whether the connecting section is parallel to the step; for example, when the connecting section is not parallel to the step, it means that the anti-drop portion of the anti-drop plate fails to directly abut against the lower surface of the step, which means that the elastic force of the torsion spring is not sufficient to make the abutting section abut against the step. The operator can replace the torsion spring in time according to this situation to avoid the problem of anti-drop failure caused by the failure of the torsion spring.

[0027] Furthermore, an operating rod is fixedly connected to the anti-slip plate, and the operating rod is parallel to the rotation center axis of the anti-slip plate.

[0028] Beneficial effect: When this solution is adopted, the setting of the operating rod makes it convenient for the operator to pull the anti-slip plate away from the bottom surface of the step through the operating rod when releasing the anti-slip. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is an axonometric diagram of the jacking beam anti-drop device in the first embodiment of the present invention when in use;

[0030] Figure 2 for Figure 1 The main view;

[0031] Figure 3 for Figure 1 A partial front cross-sectional view of

[0032] Figure 4 This is an axonometric diagram of the second embodiment of the present invention before the lifting beam body is placed in the step;

[0033] Figure 5 for Figure 4 A partial front cross-sectional view of

[0034] Figure 6It is a partial front cross-sectional view when the guide portion in the second embodiment of the present invention is a curved surface;

[0035] Figure 7 This is an axonometric diagram of Embodiment 3 of the present invention;

[0036] Figure 8 for Figure 7 A partial front cross-sectional view of

[0037] Fig. 9 It is a partial front cross-sectional view of the roller on the anti-slip plate in the third embodiment of the present invention when it abuts against the side of the step;

[0038] Fig.10 This is an axonometric schematic diagram of embodiment 4 of the present invention. DETAILED DESCRIPTION

[0039] The following is further described in detail through specific implementation methods:

[0040] The reference numerals in the drawings of the specification include: mounting plate 1, anti-slip plate 2, connecting section 21, abutting section 22, wedge surface 221, torsion spring 3, guide part 4, roller 5, operating rod 6, wear-resistant block 7, lifting beam body 10, step 20.

[0041] Embodiment 1

[0042] Embodiment 1 is basically as shown in the attached Figures 1 to 3 As shown, the lifting beam anti-slipping device includes a mounting plate 1 and an anti-slipping plate 2. The mounting plate 1 is fixedly connected to the lifting beam body 10 (the fixed connection method here can be welding, bolt connection, or other fixed connection methods), and the anti-slipping plate 2 is rotatably connected to the mounting plate 1. The anti-slipping plate 2 includes an integrally formed connecting section 21 and an abutting section 22. The connecting section 21 is rotatably connected to the mounting plate 1. A torsion spring 3 is sleeved on the rotation center of the connecting section 21 and the mounting plate 1. The lower end of the torsion spring 3 is tightly pressed against the connecting section 21, and the upper end of the torsion spring 3 is tightly pressed against the mounting plate 1. The elastic force of the torsion spring 3 can make the abutting section 22 abut against the bottom surface of the step 20. The connecting section 21 and the lifting beam body 10 are located on both sides of the step 20. After the abutting section 22 abuts against the step 20, the connecting section 21 and the step 20 can be parallel to each other.

[0043] The specific implementation process is as follows:

[0044] When this embodiment is used, before the lifting beam body 10 is placed on the step 20, the anti-slip plate 2 is manually rotated to a certain angle (at this time, the torsion spring is pressed and elastic potential energy is accumulated) to facilitate the lifting beam body 10 to be placed down on the step 10. When the lifting beam body 10 is placed in the accommodating groove of the step 20, since the torsion spring 3 is provided between the connecting section 21 and the mounting plate 1, under the action of the torsion spring 3, the abutting section 22 fixed to the connecting section 21 can automatically abut against the bottom surface of the step 20.

[0045] In this embodiment, the receiving groove of the step 20 is located on the top surface of the step 20, and the anti-drop plate 2 is located on the outside of the step 20. Therefore, the anti-drop device of this embodiment realizes the upper and lower position limitation of the lifting beam body 10 through the position relationship between the lifting beam body 10 and the step 20 and the position relationship between the anti-drop plate 2 and the step 20, which solves the anti-drop problem existing in the prior art due to the lack of anti-drop holes on the step 20, and also avoids the cost increase caused by adding anti-drop holes on the step 20 of each standard section to realize the anti-drop function. In addition, because the steps 20 are horizontal and arranged in pairs, there is an anti-slip device on the outside of each step 20 arranged in pair, that is, the two anti-slip devices fasten the lifting beam body 10 to the steps 20 from the outside of the lifting beam body 10, so that the anti-slip device cooperates with the lifting beam body 10 to achieve the upper and lower limit of the lifting beam body 10, and also limits the horizontal direction. In addition to being able to help achieve the upper and lower anti-slip of the lifting beam body 10, the anti-slip device can also perform horizontal limit to reduce the risk of overturning of the upper part of the tower crane.

[0046] In this embodiment, after the lifting beam body 10 is placed in the accommodating groove of the step 20, the anti-drop plate 2 will automatically rest against the bottom surface of the step 20 under the elastic force of the torsion spring 3. This process does not require manual operation, thereby avoiding the situation in the prior art where the movable locking pin needs to be manually inserted into the anti-drop hole to achieve the anti-drop function. It also avoids the problem of anti-drop failure caused by manually forgetting to insert the movable locking pin into the anti-drop hole, thereby improving safety.

[0047] In addition, in the present embodiment, the anti-slip plate 2 can automatically prevent the lifting beam body 10 from slipping off under the elastic force of the torsion spring 3 without the need for manual operation. Compared with the prior art which requires screwing a nut or inserting a movable locking pin, the operation of the present embodiment is simpler, which is beneficial to reducing the intensity of manual operation and saving labor costs.

[0048] Embodiment 2

[0049] Combination Figures 4 to 6 The second embodiment is further improved on the basis of the first embodiment, specifically: a guide piece is welded at the bottom of the abutting section 22, and the guide piece is integrally formed with a guide portion 4, and the guide portion 4 is a curved surface or an inclined surface, Figure 4 and Figure 5 The middle guide portion 4 is an inclined surface. Figure 6 The middle guide portion 4 is a curved surface, and the guide portion 4 can contact the upper edge of the step 20. In this embodiment, the guide portion 4 is a guide plate.

[0050] The specific implementation process is as follows:

[0051] When the present embodiment is adopted, when the lifting crossbeam body 10 is placed from top to bottom into the receiving groove of the step 20, since the anti-slip plate 2 is connected to the crossbeam body, the anti-slip plate 2 will also move from top to bottom. During the downward movement of the anti-slip plate 2, the right end of the guide portion 4 of the guide member contacts the right edge of the upper end of the step 20, and then the contact between the guide portion 4 and the right edge of the upper end of the step 20 pushes the anti-slip plate 2 to rotate a certain angle around the hinge point (at this time, the torsion spring 3 is pressed and elastic potential energy is accumulated), so that the anti-slip plate 2 can automatically rotate to the right side of the step 20, thereby facilitating the anti-slip plate 2 to rotate to the right side of the step 20. It can automatically rotate outward and open (that is, rotate counterclockwise and open) as the lifting beam body 10 is placed into the step 20. After the anti-slip plate 2 rotates and opens relative to the step 20, the lifting beam body 10 continues to move downward until it moves into the accommodating groove of the step 20. When the lifting beam body 10 moves to the accommodating groove of the step 20, the abutment section 22 of the anti-slip plate 2 also moves to the bottom of the step 20. The abutment section 22 loses the obstruction of the right side of the step 20 and rotates clockwise under the elastic potential energy of the torsion spring 3 to tighten the bottom surface of the step 20, completing the automatic anti-slip device.

[0052] Compared with the prior art which requires manual operation of the movable locking pin or manual screwing of the nut to achieve anti-slipping, the anti-slipping function of this embodiment is automatically achieved by the action of lifting the crossbeam body 10 and placing it into the step 20, which further reduces the manual operation cost and automatically achieves anti-slipping, completely avoiding the safety hazards caused by manual forgetting to perform the anti-slipping operation, and is beneficial to improving the installation efficiency of the tower crane.

[0053] Embodiment 3

[0054] Embodiment 3 is a further improvement on the basis of Embodiment 2. The specific improvements are as follows: a plurality of rollers 5 are rotatably connected to the guide portion 4; Figures 7 to 9 In this embodiment, the guide portion 4 is taken as an example of an inclined surface.

[0055] The left end of the guide portion 4 extends beyond the left end of the abutting section 22. A wedge surface 221 is processed on the left end of the abutting section 22. The distance between the upper end of the wedge surface 221 and the connecting section 21 is smaller than the distance between the lower end of the wedge surface 221 and the connecting section 21. In this embodiment, in order to enable the anti-slip plate 2 to move quickly to the side of the step 20, the wedge surface 221 and the guide portion 4 form a V shape.

[0056] Compared with the second embodiment, the present embodiment adds a roller 5 to the guide portion 4, so that the sliding friction between the guide portion 4 and the step 20 is changed to rolling friction, which is conducive to reducing the wear of the step 20; and the wedge surface 221 is processed on the left end surface of the abutting section 22, so that after the guide portion 4 of the anti-slip plate 2 moves to the bottom of the step 20, the wedge surface 221 of the abutting section 22 contacts the right edge of the bottom surface of the step 20 to generate sliding friction, which is compared with the sliding friction of the abutting section 22 on the side of the step 20, avoiding the wear on the side of the step 20 when the anti-slip plate 2 is about to complete the anti-slip function. That is, when the present embodiment is adopted, the anti-slip plate 2 has rolling friction with the side of the step 20 and the upper right edge of the step 20, and only has sliding friction on the right edge of the bottom surface of the step 20, and the wear of the right edge of the bottom surface of the step 20 can be ignored. The quality of the entire standard section can be ignored, so that the present embodiment can automatically realize the anti-slip function while reducing friction and the impact on the step 20.

[0057] In addition, before realizing automatic anti-slipping, the anti-slipping plate 2 first gradually rotates counterclockwise under the action of the guide part 4 and the step 20, and before the abutment section 22 is about to abut against the bottom surface of the step 20, the anti-slipping plate 2 gradually rotates clockwise under the action of the wedge surface 221 and the step 20. In the entire process of rotating the anti-slipping plate 2 to open and forcing the anti-slipping plate 2 to fasten the step 20, the anti-slipping plate 2 has a small rotation angle whether clockwise or counterclockwise, and the rotation angle changes gradually. Compared with the method of manually directly opening the anti-slipping plate 2 quickly, this embodiment is beneficial to extending the service life of the torsion spring 3.

[0058] Embodiment 4

[0059] Combination Fig.10 This embodiment is further improved on the basis of the third embodiment, specifically: an operating rod 6 is welded on the guide member, and the operating rod 6 is parallel to the rotation center axis of the anti-drop plate 2. A wear-resistant part is detachably connected to the abutting section 22 by screws, and the wear-resistant part adopts a wear-resistant block 7, and the upper surface of the wear-resistant block 7 can abut against the bottom surface of the step 20.

[0060] The operating lever 6 of this embodiment can facilitate workers to release the anti-drop function of the anti-drop plate 2; and the setting of the wear-resistant parts can extend the service life of the abutment section 22 and reduce the number of times the abutment section 22 is replaced due to wear; in addition, this embodiment adopts a detachable screw connection to reduce the difficulty of replacing the wear-resistant parts.

[0061] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. The lifting beam anti-drop device includes an anti-drop plate, which is characterized by: The anti-drop plate is rotatably connected to the lifting beam body, and the anti-drop plate includes a connecting section and an abutting section that are fixedly connected to each other, the connecting section is rotatably connected to the lifting beam body, a torsion spring is provided between the connecting section and the lifting beam body, and the abutting section can abut against the bottom surface of the step; The connecting section and the lifting beam body are located on both sides of the step; A guide portion is provided at the bottom of the abutting section. The guide portion is a curved surface or an inclined surface. The guide portion can contact the upper edge of the step. A plurality of rollers are provided on the guide portion. The end of the guide portion away from the connecting section exceeds the end of the abutting section.

2. The lifting beam anti-drop device according to claim 1, characterized in that: A wedge surface is provided at one end of the abutting section away from the connecting section, and the distance between the upper end of the wedge surface and the connecting section is smaller than the distance between the lower end of the wedge surface and the connecting section.

3. The lifting beam anti-drop device according to claim 1, characterized in that: The abutting section is detachably connected with a wear-resistant portion, and the wear-resistant portion can abut against the bottom surface of the step.

4. The lifting beam anti-drop device according to claim 1, characterized in that: After the abutting section abuts against the step, the connecting section and the step can be parallel to each other.

5. The lifting beam anti-drop device according to claim 1, characterized in that: An operating rod is fixedly connected to the anti-slip plate, and the operating rod is parallel to the rotation center axis of the anti-slip plate.

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