An ascending limit device for easy installation of a bridge crane

Abstract

This utility model provides an easy-to-install lifting limit device for bridge cranes, relating to the field of lifting machinery. It includes a channel-shaped base, a U-shaped bracket fixed to the channel-shaped base by bolts, and an elongated hole on the U-shaped bracket. A nylon guide wheel is provided on the upper part of the U-shaped bracket, and one end of the nylon guide wheel is connected to a limit rod. The other end of the limit rod is connected to a swing-arm type limit switch. A return spring is sleeved on the limit rod to reset it after triggering. The elongated hole on the channel-shaped base facilitates adjustment of the horizontal position of the limit device, and the lower wire rope determines the longitudinal installation position, greatly simplifying the installation and debugging process. The use of a mechanical switch avoids malfunctions caused by harsh environments and high dust levels, improving the reliability of the limit device.

Description

Technical Field

[0001] This utility model relates to the field of lifting machinery, and in particular to a lifting limit device that is easy to install on a bridge crane. Background Technology

[0002] Bridge cranes, as important material handling equipment, are widely used in factories, warehouses, docks, and other places. The lifting mechanism's upper limit device is a key safety component of bridge cranes, often used as an end-point limiter to restrict the hook's lifting height, preventing collisions with the crane structure, overshooting accidents, damage to motors, drums, and other equipment, or wire rope breakage due to overwinding, causing the hook to fall and injure personnel. Meanwhile, to meet the State Administration for Market Regulation's requirements for "dual limit" systems on lifting machinery (Market Supervision Special Equipment Document

[2021] No. 16), developing a suitable and quickly installable upper limit control device is of great significance.

[0003] Traditional lifting limit devices typically employ a dropper-type limit switch. This switch, based on a lever principle, stops the crane's lifting motion by breaking the limit switch contacts mounted on the trolley frame when the hook strikes the dropper. However, this type of limit device has the following drawbacks:

[0004] Installation and commissioning are complex: The installation position of the suspended dropper and the contact point of the hook need to be precisely adjusted to ensure that the limit action is triggered at the correct height. This requires professional operation, and the commissioning process is cumbersome and time-consuming; Low reliability: The dropper is easily entangled with the swinging hoisting drum wire rope, causing the limit switch to malfunction and affecting the normal operation of the crane; High maintenance costs: Dropper-type limit switches have a low protection level, and the contacts are greatly affected by dust, requiring regular maintenance and replacement, increasing the cost of use. To solve the above problems, some upward limit devices based on electronic sensors have emerged in recent years, such as photoelectric switches and proximity switches. Although these devices can meet the functional requirements to a certain extent, they do not meet the national standard requirements for mechanical hard limit switches and have problems such as complex installation and commissioning and high costs.

[0005] Therefore, developing a bridge crane lifting limit device that is easy to install, simple to debug, highly reliable, and low in cost is of great practical significance. Utility Model Content

[0006] This utility model provides an easy-to-install lifting limit device for bridge cranes, which solves the problems of difficult installation and debugging and high cost in existing drop-type limit switches and photoelectric limit switches.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] An easy-to-install lifting limit device for bridge cranes includes a channel-shaped base, a U-shaped bracket fixed to the channel-shaped base by bolts, and an elongated hole on the U-shaped bracket; a nylon guide wheel is provided on the upper part of the U-shaped bracket, the nylon guide wheel is connected to one end of a limit rod, the other end of the limit rod is connected to a swing rod type limit switch, and a reset spring is sleeved on the limit rod to reset the limit rod after triggering.

[0009] Furthermore, the lever-type limit switch is fixedly installed on the vertical surface of the U-shaped bracket, and its direction of action is consistent with the direction of the wire rope winding.

[0010] Furthermore, the grooved base is formed by bending a steel plate, and elongated holes are opened on the surface for adjusting the lateral fixing position of the U-shaped bracket.

[0011] Furthermore, the reset spring is sleeved outside the limiting strike rod, with one end fixed to the U-shaped bracket and the other end pushing against the limiting strike rod to ensure that it automatically resets after being triggered.

[0012] Furthermore, both ends of the limiting strike rod pass through the U-shaped bracket and are fixed to the U-shaped bracket by anti-torsion positioning pins.

[0013] Furthermore, the device is installed at the lower rope of the crane trolley frame wire rope. The lifting hook is raised to the limit position for adjustment, and the U-shaped bracket is finely adjusted to ensure the reliable operation of the swing arm limit switch.

[0014] The beneficial effects of this utility model are as follows:

[0015] Easy installation and debugging: The elongated holes on the mounting base facilitate the adjustment of the horizontal position of the limit device, and the lower wire rope determines the longitudinal installation position of the product, greatly simplifying the installation and debugging process.

[0016] High reliability: The use of mechanical switches avoids malfunctions caused by harsh environments and high dust levels, thus improving the reliability of the limit device.

[0017] Low maintenance costs: Mechanical switches are inexpensive and have a long service life, requiring no frequent maintenance or replacement, thus reducing operating costs.

[0018] Currently, after testing on the company's internal bridge cranes, the lifting limit device has proven its effectiveness, providing ultimate safety protection and ensuring the safe operation of the equipment. Attached Figure Description

[0019] To more clearly illustrate the embodiments of this utility model or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0020] Figure 1 This is a structural diagram of the device of this utility model.

[0021] Figure 2 This is the front view of the present utility model.

[0022] Figure 3 This is the left view of the present invention.

[0023] Figure 4 This is a top view of the present invention.

[0024] Figure 5 This is a diagram illustrating the operation process of this device.

[0025] Figure 6 This is a schematic diagram of the installation of this device.

[0026] Explanation of icon numbers:

[0027] 1. Channel-shaped base; 2. U-shaped bracket; 3. Nylon guide wheel; 4. Limiting rod; 5. Return spring; 6. Swing rod type limit switch; 7. Anti-torsion positioning pin. Detailed Implementation

[0028] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0032] This utility model provides a technical solution: a lifting limit device that is easy to install on a bridge crane, such as... Figure 1-4 As shown, it includes:

[0033] The groove-shaped base 1 is used for fixed installation on the crane trolley frame;

[0034] The U-shaped bracket 2 is fixed to the grooved base 1 by bolts. The U-shaped bracket 2 has elongated holes for adjusting the lateral position.

[0035] The nylon guide wheel 3, made of nylon, is rotatably mounted on the U-shaped bracket 2 and is used to directly contact the lifting wire rope;

[0036] The limit stop bar 4 is connected at one end to the nylon guide wheel 3 and at the other end to the swing rod type limit switch 6;

[0037] The reset spring 5 is sleeved on the limit stop rod 4 and is used to reset the limit stop rod 4 after triggering.

[0038] The swing arm limit switch 6 is fixedly installed on the vertical surface of the U-shaped bracket 2, and its operating direction is consistent with the winding direction of the wire rope. When the hoisting wire rope moves to the limit position, it pushes the guide wheel 3 to move horizontally, which drives the limit rod 4 to trigger the swing arm limit switch 6 and disconnect the power supply of the crane's main contactor.

[0039] Preferably, the grooved base 1 is made of bent steel plate and has elongated holes on its surface for adjusting the lateral fixed position of the U-shaped frame 2.

[0040] The nylon guide wheel 3 is made of nylon with a smooth surface, which is used to reduce steel wire rope friction and ensure contact sensitivity.

[0041] The reset spring 5 is sleeved outside the limit rod 4, with one end fixed to the U-shaped bracket 2 and the other end pushing against the limit rod 4 to ensure automatic reset after triggering. The two ends of the limit rod 4 pass through the U-shaped bracket 2 and are fixed to the U-shaped bracket 2 by anti-torsion positioning pins 7.

[0042] The swing arm limit switch 6 is model HL-5030. Its strike gauge can be adjusted to near or far, and it has a fast response speed and strong anti-interference ability.

[0043] The device is installed at the bottom of the wire rope on the crane trolley frame. It is adjusted by raising and lowering the hook to the limit position and fine-tuning the U-shaped bracket 2 to ensure the reliable operation of the limit switch 6.

[0044] Action process: such as Figure 5 As shown, under normal winding conditions, the hoisting wire rope will wind along the groove of the wire rope drum. When the hoisting wire rope moves to the designated position along the groove of the drum, the wire rope will press against the nylon guide wheel 3 to produce horizontal movement, which will drive the limit rod 4 to push the swing rod type limit switch 6 to disconnect the power supply of the crane's main contactor coil, thereby achieving the purpose of power cut-off for the entire vehicle and achieving protection.

[0045] like Figure 6 As shown, during installation, place the device at the lower rope of the steel wire rope on the cover plate of the trolley frame, raise the lifting hook to the upper limit position, press the nylon guide wheel 3 to make the swing arm of the swing arm limit switch 6 rotate to the contact disconnect position, then weld the grooved base 1 to the steel structure of the trolley frame, connect the power supply of the motor in the descent direction, and repeatedly raise and lower to the limit position. Fine adjust the U-shaped bracket 2 so that the switch can operate normally each time it reaches the upper limit position.

[0046] This device boasts advantages such as simple manufacturing, low investment, convenient installation and debugging, easy replacement, and reliable use, effectively serving as a lifting limit switch. When used in conjunction with a counterweight limit switch, this lifting limit device can also determine the tangling condition of the hoisting wire rope, allowing for timely detection of any tangled wire rope issues.

[0047] Currently, after testing on the company's internal bridge cranes, the device has proven its effectiveness, providing ultimate safety protection and a solid guarantee for the safe operation of the equipment.

[0048] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A lifting limit device that is easy to install on a bridge crane, characterized in that, The device includes a grooved base (1), a U-shaped bracket (2) which is fixed to the grooved base (1) by bolts, and the U-shaped bracket (2) has an elongated hole; a nylon guide wheel (3) is provided on the upper part of the U-shaped bracket (2), the nylon guide wheel (3) is connected to one end of a limit rod (4), the other end of the limit rod (4) is connected to a swing rod type limit switch, and a reset spring (5) is sleeved on the limit rod (4) to reset the limit rod (4) after triggering.

2. The lifting limit device for easy installation on a bridge crane according to claim 1, characterized in that, The lever-type limit switch (6) is fixedly installed on the vertical surface of the U-shaped bracket (2), and its operating direction is consistent with the winding direction of the wire rope.

3. The lifting limit device for easy installation on a bridge crane according to claim 1, characterized in that, The grooved base (1) is made of steel plate bent and has long holes on its surface for adjusting the lateral fixed position of the U-shaped bracket (2).

4. The lifting limit device for easy installation on a bridge crane according to claim 1, characterized in that, The reset spring (5) is sleeved outside the limiting strike rod (4), with one end fixed to the U-shaped bracket (2) and the other end pushing against the limiting strike rod (4) to ensure that it automatically resets after being triggered.

5. The lifting limit device for easy installation on a bridge crane according to claim 1, characterized in that, The limiting strike bar (4) passes through the U-shaped bracket (2) at both ends and is fixed to the U-shaped bracket (2) by anti-torsion positioning pin (7).

6. The lifting limit device for easy installation on a bridge crane according to claim 1, characterized in that, The device is installed at the bottom of the steel wire rope of the crane trolley frame. The lifting hook is raised to the limit position for adjustment. The U-shaped bracket (2) is finely adjusted to ensure that the swing arm limit switch (6) operates reliably.

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