Angle detection limiting device and movable arm type tower crane

Abstract

The utility model provides an angle detection limiting device and a movable arm type tower crane. The angle detection limiting device is applied to the movable arm type tower crane and comprises a detection collision block arranged between a buffer connecting rod and a buffer fixing block, the detection collision block is provided with a first end and a second end, and the first end of the detection collision block is rotationally connected with a buffer of the movable arm type tower crane; the limiting switch is fixed to the buffer fixing block and arranged on the moving path of the detection collision block, so that when the distance between the buffer connecting rod and the buffer fixing block is smaller than a preset distance threshold value, the detection collision block makes contact with the limiting switch and triggers the limiting switch, and the limiting switch is used for controlling a luffing mechanism of the movable arm type tower crane to work. According to the scheme, the structure is simple, installation and manufacturing are convenient, and the reliability of the limiting device can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, and in particular to an angle detection and limiting device and a luffing jib tower crane. Background Technology

[0002] A luffing jib crane is a type of tower crane whose jib can pitch under the action of a luffing device. In related technologies, the pitch angle of the tower crane jib is usually controlled by detecting the movement distance of the luffing wire rope, and a buffer device is used to provide a certain limit protection. However, the length and tension of the luffing wire rope may change, affecting the accuracy of pitch angle control. This results in a large impact force on the buffer device when the luffing angle reaches the limit position, which may pose a safety hazard. Utility Model Content

[0003] This utility model provides an angle detection and limiting device and a luffing jib tower crane to solve the problem of low luffing control accuracy of luffing jib tower cranes.

[0004] To solve the above problems, this utility model is implemented as follows:

[0005] In a first aspect, this utility model provides an angle detection and limiting device applied to a luffing jib tower crane. The luffing jib tower crane includes a jib, a buffer connecting rod connected to the jib, and a buffer fixing block. The buffer connecting rod is disposed toward the buffer fixing block, and when the jib moves in luffing motion, the buffer connecting rod moves toward or away from the buffer fixing block. The angle detection and limiting device includes:

[0006] A detection block is disposed between the buffer connecting rod and the buffer fixing block. The detection block has a first end and a second end. The first end of the detection block is rotatably connected to the buffer of the luffing jib tower crane.

[0007] A limit switch is fixed to the buffer fixing block and set on the moving path of the detection impact block. When the distance between the buffer connecting rod and the buffer fixing block is less than a preset distance threshold, the detection impact block contacts the limit switch and triggers the limit switch. The counterweight of the limit switch is used to control the luffing mechanism of the luffing tower crane.

[0008] In some embodiments, the device further includes a trigger plate and a fixing screw for triggering the limit switch, one end of the fixing screw being fixed to the trigger plate in a direction perpendicular to the trigger plate, and the other end of the fixing screw being fixed to the detection block.

[0009] In some embodiments, the trigger plate is fixed to the fixing screw by a limiting nut, the limiting nut being used to adjust the position of the trigger plate on the fixing screw.

[0010] In some embodiments, it also includes:

[0011] An elastic element is fixed at one end to the buffer connecting rod and at the other end to the second end of the detection block, so that the second end of the detection block deflects toward the buffer connecting rod and abuts against the buffer connecting rod under the elastic force of the elastic element.

[0012] Secondly, embodiments of this application provide a luffing jib tower crane, which includes a lifting jib, a buffer connecting rod connected to the lifting jib, and a buffer fixing block. The luffing jib tower crane also includes the angle detection and limiting device described in any one of the first aspects.

[0013] In some embodiments, the buffer connecting rod has a clearance groove on the side facing the buffer fixing block. The range of the clearance groove is larger than the range of the detection block along the direction in which the buffer connecting rod moves toward the buffer fixing block, so that when the buffer connecting rod and the buffer fixing block abut, the detection block is accommodated in the clearance groove.

[0014] The angle detection and limiting device provided in this application embodiment moves the buffer connecting rod after the crane boom contacts the buffer. The buffer connecting rod then moves the impact rod, causing the detection impact block to contact the limit switch. This causes the limit switch to rotate, triggering a switch to stop the crane boom luffing, thus providing protection. As the crane boom luffing angle decreases, the buffer impact rod retracts, and the spring pulls the impact block back, restoring the original position. The solution in this application embodiment has a simple structure, is easy to install and manufacture, and ensures the reliability of the limiting device. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the angle detection and limiting device provided in this embodiment of the utility model;

[0017] Figure 2 This is another schematic diagram of the angle detection and limiting device provided in this embodiment of the utility model. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0019] In the embodiments of this utility model, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices. Additionally, the use of "and / or" in this application indicates at least one of the connected objects, such as A and / or B and / or C, representing seven possibilities: including A alone, B alone, C alone, and the presence of both A and B, both B and C, both A and C, and the presence of A, B, and C.

[0020] This utility model provides an angle detection and limiting device and a luffing tower crane using the angle detection and limiting device.

[0021] like Figure 1 and Figure 2 As shown, in one embodiment, the luffing tower crane includes a boom, a buffer connecting rod 101 connected to the boom, and a buffer fixing block 102. The boom can pitch under the drive of the luffing mechanism. The buffer connecting rod 101 is positioned toward the buffer fixing block 102. When the boom luffs, the buffer connecting rod 101 moves toward or away from the buffer fixing block 102. When the boom moves to its limit position, the buffer connecting rod 101 impacts the buffer fixing block 102, thus providing a buffering effect.

[0022] In one embodiment, the angle detection and limiting device includes a detection block 201 and a limit switch 202.

[0023] like Figure 1 and Figure 2 As shown, the detection block 201 is disposed between the buffer connecting rod 101 and the buffer fixing block 102. The detection block 201 has a first end and a second end. The first end of the detection block 201 is rotatably connected to the buffer of the luffing tower crane.

[0024] The limit switch 202 is fixed to the buffer fixing block 102 and is set on the moving path of the detection block 201. When the distance between the buffer connecting rod 101 and the buffer fixing block 102 is less than the preset distance threshold, the detection block 201 contacts the limit switch 202 and triggers the limit switch 202. The counterweight of the limit switch 202 controls the luffing mechanism of the luffing tower crane.

[0025] During operation, the boom's luffing motion includes boom raising and boom lowering. When the boom raises, it simultaneously moves the buffer connecting rod 101 toward the buffer fixing block 102. When it moves to a distance less than the preset threshold, the buffer connecting rod 101 pushes the detection impact block 201 to abut against the limit switch 202 and triggers the limit switch 202. After the limit switch 202 is activated, it restricts the boom luffing mechanism of the luffing tower crane from continuing to raise, so as to prevent the buffer connecting rod 101 from violently impacting the buffer fixing block 102. At this time, the tower crane can still perform boom lowering.

[0026] When the luffing mechanism of the luffing tower crane lowers the boom and causes the detection block 201 to disengage from the limit switch 202, the limit switch 202 resets, and the luffing mechanism of the luffing tower crane can perform the lowering motion again.

[0027] In some embodiments, a trigger plate 2011 and a fixing screw 2012 for triggering the limit switch 202 are also included. One end of the fixing screw 2012 is fixed to the trigger plate 2011 in a direction perpendicular to the trigger plate 2011, and the other end of the fixing screw 2012 is fixed to the detection block 201. Further, in some embodiments, the trigger plate 2011 is fixed to the fixing screw 2012 by a limiting nut 2013, which is used to adjust the position of the trigger plate 2011 on the fixing screw 2012.

[0028] Due to the assembly tolerances of the construction machinery itself, and the possibility of structural deformation caused by collisions during operation, by setting a trigger plate 2011 and a fixing screw 2012, and further adjusting the position of the trigger plate 2011 on the fixing screw 2012 through the limit nut 2013, the position of the trigger limit switch 202 can be adjusted in a targeted manner according to the actual assembly of the equipment, thereby controlling the starting and ending range and improving safety.

[0029] In some embodiments, an elastic element 203 is also included. The elastic element 203 may be a spring or a sheet, etc. One end of the elastic element 203 is fixed to the buffer connecting rod 101, and the other end is connected to the second end of the detection block 201. In this way, under the elastic force of the elastic element 203, the second end of the detection block 201 deflects toward the buffer connecting rod 101 and abuts against the buffer connecting rod 101.

[0030] The angle detection and limiting device provided in this application embodiment, when the crane boom contacts the buffer, pushes the buffer connecting rod 101 to move. The buffer connecting rod 101 pushes the impact rod to move, causing the detection impact block 201 to contact the limit switch 202, causing the limit switch 202 to rotate and trigger the switch, stopping the boom luffing, thus providing a protective function. When the boom luffing angle decreases, the buffer impact rod retracts, the spring pulls back the impact block, and the crane returns to its original position. The solution in this application embodiment has a simple structure, is easy to install and manufacture, and can ensure the reliability of the limiting device.

[0031] This application embodiment also provides a luffing jib tower crane, which includes a lifting jib, a buffer connecting rod 101 connected to the lifting jib, and a buffer fixing block 102. The luffing jib tower crane also includes any of the above angle detection and limiting devices.

[0032] Since the technical solution of this embodiment includes all the technical solutions of the above-mentioned angle detection and limiting device embodiments, it can at least achieve all the above-mentioned technical effects, which will not be repeated here.

[0033] In some embodiments, the buffer connecting rod 101 has a clearance groove on the side facing the buffer fixing block 102. The range of the clearance groove is larger than the range of the detection block 201 along the direction in which the buffer connecting rod 101 moves toward the buffer fixing block 102, so that when the buffer connecting rod 101 and the buffer fixing block 102 abut, the detection block 201 is accommodated in the clearance groove.

[0034] By setting this avoidance groove, the buffer connecting rod 101 can be prevented from directly impacting the detection block 201, thereby reducing the possibility of collision deformation of the detection block 201 and improving the reliability of the equipment.

[0035] The above are preferred embodiments of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An angle detection and limiting device, applied to a luffing jib tower crane, the luffing jib tower crane comprising a jib, a buffer connecting rod connected to the jib, and a buffer fixing block, the buffer connecting rod being disposed toward the buffer fixing block, and, during the luffing movement of the jib, the buffer connecting rod moving toward or away from the buffer fixing block, characterized in that, The angle detection and limiting device includes: A detection block is disposed between the buffer connecting rod and the buffer fixing block. The detection block has a first end and a second end. The first end of the detection block is rotatably connected to the buffer of the luffing jib tower crane. A limit switch is fixed to the buffer fixing block and set on the moving path of the detection impact block. When the distance between the buffer connecting rod and the buffer fixing block is less than a preset distance threshold, the detection impact block contacts the limit switch and triggers the limit switch. The counterweight of the limit switch is used to control the luffing mechanism of the luffing tower crane.

2. The angular detection limit stop of claim 1, wherein, It also includes a trigger plate and a fixing screw for triggering the limit switch. One end of the fixing screw is fixed to the trigger plate in a direction perpendicular to the trigger plate, and the other end of the fixing screw is fixed to the detection block.

3. The angular detection limit stop of claim 2, wherein, The trigger plate is fixed to the fixing screw by a limiting nut, and the limiting nut is used to adjust the position of the trigger plate on the fixing screw.

4. The angular detection limit stop of claim 1, wherein, Also includes: An elastic element is fixed at one end to the buffer connecting rod and at the other end to the second end of the detection block, so that the second end of the detection block deflects toward the buffer connecting rod and abuts against the buffer connecting rod under the elastic force of the elastic element.

5. A jib crane, characterized by comprising: The luffing jib tower crane includes a lifting jib, a buffer connecting rod connected to the lifting jib, and a buffer fixing block. The luffing jib tower crane also includes an angle detection and limiting device as described in any one of claims 1 to 4.

6. The jib crane according to claim 5, wherein The buffer connecting rod has a clearance groove on the side facing the buffer fixing block. The range of the clearance groove is larger than the range of the detection block along the direction in which the buffer connecting rod moves toward the buffer fixing block, so that when the buffer connecting rod and the buffer fixing block abut, the detection block is accommodated in the clearance groove.

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