Cable reel cable guide device with cable protection function for crane

Abstract

The utility model discloses a cable reel fairlead device with cable protection for a crane. The cable reel fairlead device comprises a detection device and a fairlead frame swing rod which are arranged on a fairlead frame, the detection device comprises a cable pre-loosening limit switch, a first direction limit switch, a second direction limit switch, an over-tightening limit switch, an induction plate and a detection swing rod, and the detection swing rod is connected with the cable guide frame swing rod through a connecting rod and swings at the same angle and in the same direction along with the cable guide frame swing rod; a plurality of arc-shaped induction plates are arranged on the detection swing rod and used for triggering the corresponding cable pre-loosening limiting switch, the first direction limiting switch, the second direction limiting switch or the over-tightening limiting switch when the detection swing rod swings to the corresponding position.

Description

Technical Field

[0001] The utility model relates to a cable guiding device for a crane, in particular to a cable reel cable guiding device with cable tightness detection protection. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] The cable reel device is installed on the crane or other machinery that needs to be moved to provide power for the mobile equipment. When the mechanical trolley is running, the cable reel device also operates accordingly. Whether the cable reel device can operate reliably directly affects whether the crane can be powered normally.

[0004] At present, the trolley power cable reel on the crane often adopts two types of cable reels, namely, a locked-rotor torque motor or a hysteresis motor, and is equipped with a cable guide device. When winding the cable, the motor output torque is the power, and the reel is driven to collect the cable through the reducer. When releasing the cable, the motor output torque is the blocking force, which prevents the cable from being quickly pulled off the reel, ensuring the synchronization of the cable release. When the crane is frequently started, stopped, and traveled at high speed in the forward and reverse directions, the cable on the cable reel may be too loose or too tight. If it is too loose, the cable will extend maliciously after being loosened, resulting in irregular cables. If it is too tight, the cable will be broken due to excessive tension, causing certain economic losses. In serious cases, personal electric shock accidents may occur. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a cable reel guide device with cable protection for a crane in view of the situation that the reel cable may be too loose or too tight during frequent starting, stopping and high-speed travel.

[0006] The technical solution adopted by the utility model is as follows:

[0007] In the first aspect, the utility model discloses a cable reel guide device with cable protection for a crane, comprising a detection device and a cable guide frame swing arm installed on a cable guide frame; the detection device comprises a pre-cable loose limit switch, a first direction limit switch, a second direction limit switch, an over-tight limit switch, a sensor plate, and a detection swing arm, the detection swing arm is connected to the cable guide frame swing arm through a connecting rod, and swings at the same angle and in the same direction as the cable guide frame swing arm at any time; a plurality of arc-shaped sensor plates are arranged on the detection swing arm, and the arc-shaped sensor plates are used to trigger the corresponding pre-cable loose limit switch, the first direction limit switch, the second direction limit switch or the over-tight limit switch when the detection swing arm swings to the corresponding position.

[0008] As a further technical solution, the pre-cable loosening limit switch is triggered by two arc-shaped induction plates, one of which is arranged on the upper part of the detection swing rod and the other is arranged on the lower part of the detection swing rod.

[0009] As a further technical solution, the first direction limit switch is triggered by an arc-shaped induction plate.

[0010] As a further technical solution, the second direction limit switch is triggered by an arc-shaped induction plate.

[0011] As a further technical solution, the overtightening limit switch is triggered by two arc-shaped induction plates, one of which is arranged on the upper part of the detection pendulum rod and the other is arranged on the lower part of the detection pendulum rod.

[0012] As a further technical solution, the detection device also includes a protection box, the detection rocker arm is hinged to the protection box, a pre-cable loose limit switch and a first direction limit switch are arranged on one side of the hinged position, and a second direction limit switch or an over-tightening limit switch is arranged on the other side.

[0013] As a further technical solution, six arc-shaped sensing plates are arranged on the detection rocker arm, and an arc-shaped sensing plate extending to the left and an arc-shaped sensing plate extending to the right are arranged above the hinge position of the detection rocker arm and the protection box; two arc-shaped sensing plates extending to the left and two arc-shaped sensing plates extending to the right are arranged below the hinge position of the detection rocker arm and the protection box.

[0014] As a further technical solution, among the two arc-shaped sensing plates located above the hinged position of the detection rocker arm and the protection box, the arc-shaped sensing plate extending to the left is used to trigger the pre-cable loosening limit switch; the arc-shaped sensing plate extending to the right is used to trigger the over-tightening limit switch.

[0015] As a further technical solution, two arc-shaped induction plates extending to the left and two arc-shaped induction plates extending to the right are arranged alternately below the hinged position of the detection rocker arm and the protection box. One arc-shaped induction plate extending to the left is used to trigger the pre-cable loosening limit switch, and the other arc-shaped induction plate extending to the left is used to trigger the first direction limit switch; one arc-shaped induction plate extending to the right is used to trigger the second direction limit switch, and the other arc-shaped induction plate extending to the right is used to trigger the over-tightening limit switch.

[0016] The protection method of the cable reel guide device with cable protection for crane is as follows:

[0017] The cam limit switch converts the cable storage information of the cable storage reel into four limit signals of full reel, pre-full reel, pre-empty reel and empty reel, and feeds them back to the cable reel control system;

[0018] When the cable storage information of the cable reel is in the pre-full reel, the cable reel control system logic determines that the trolley is in the cable pit state at this time, the cable guide frame swing arm is in the middle position, and the induction plate does not trigger the loose cable limit switch, the first direction limit switch, the second direction limit switch, and the over-tightening limit switch;

[0019] When the trolley moves to the left, and the cable storage information of the cable reel is not in the pre-full reel or the empty reel, the cable is gradually tightened, driving the cable guide swing arm to swing to the left, and the induction plate in the control box triggers the first direction limit switch and the cable loosening limit switch; the electronic control system determines the direction of the trolley at this time, and the cable reel is in normal movement state;

[0020] When the trolley moves to the right, and the cable storage information of the cable reel is not in the pre-full reel or empty reel, the cable is gradually tightened, driving the cable guide swing arm to swing to the right, and the induction plate in the control box triggers the second direction limit switch and the cable loosening limit switch; the electronic control system determines the direction of the trolley at this time, and the cable reel is in normal movement;

[0021] When the cable is too loose, the induction plate triggers the first direction limit switch or the second direction limit switch, and the loose cable limit switch is not triggered. At this time, the cable reel control system determines that the cable has become loose, and the electric control system automatically increases the motor reel driving torque until the loose cable limit switch is triggered again. The motor automatically restores the normal torque, so that the cable retraction and extension are consistent with the trolley travel speed;

[0022] When there is an impact during the movement of the trolley or the torque of the cable reel is too large, the cable tension will overcome the force set by the spring buffer, causing the cable guide device to tilt as a whole. At this time, the sensor plate triggers the loose cable limit switch, the first direction limit switch or the second direction limit switch, and the over-tight limit switch; at this time, the electronic control system sends an emergency stop fault signal and stops the vehicle to ensure that the cable is not broken due to excessive tension.

[0023] The beneficial effects produced by the utility model are as follows:

[0024] The utility model installs a cable over-tightening, over-loosening and other state signal detection device on the cable guide device of the cable reel, and feeds back to the cable reel control system, thereby controlling the running speed of the reel, so that the tension on the cable is always within the permitted value range, ensuring that the cable is not damaged. The device includes: a cable reel, a cam limit switch, a buffer-type cable guide, a cable guide swing rod, and a detection device. Through the combination of the above components, the working state of the cable reel is detected in real time. The electric control system controls the output torque and speed of the motor according to the above signal, so that the cable retraction and release are consistent with the trolley travel speed, and the cable tension is kept approximately constant, ensuring that the cable tension is always within the permitted value range, and no damage is caused to the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1This is a schematic diagram of the cable reel in use according to the utility model;

[0026] Figure 2 This is the main view of the cable guide;

[0027] Figure 3 is a schematic diagram of the detection device;

[0028] Figure 4 This is a schematic diagram of the detection device passing through the pit;

[0029] Figure 5 This is a schematic diagram of the normal walking state of the detection device;

[0030] Figure 6 This is a schematic diagram of the loose cable state of the detection device;

[0031] Figure 7 It is a schematic diagram of the over-tightening state of the detection device;

[0032] In the figure: 1- cam limit switch; 2- cable reel; 3- buffered cable guide; 4- detection device; 4-1 pre-cable loosening limit switch; 4-2 first direction limit switch; 4-3 second direction limit switch; 4-4 over-tightening limit switch; 4-5 induction plate; 4-6 detection rocker; 4-7 protection box; 5- cable guide rocker; 6 connecting rod. DETAILED DESCRIPTION

[0033] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or their combinations;

[0035] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0036] As introduced in the background technology, there are deficiencies in the prior art. In order to solve the above technical problems, the utility model proposes a cable reel guide device with cable protection for cranes and a protection method.

[0037] In a typical implementation manner of the utility model, the utility model provides a cable reel cable guide device with cable protection for a crane. Figure 1 This is a schematic diagram of the cable reel in use of the utility model; it includes a cam limit switch 1; a cable reel 2; a buffer cable guide 3; a detection device 4; a cable guide swing rod 5; and a connecting rod 6;

[0038] The cam limit switch 1 is fixed to the tail of the reducer of the cable reel 2 by bolts, and the cable condition on the cable reel 2 is obtained by detecting the rotation speed of the reducer; specifically, the cam limit switch 1 can convert the cable storage information (trolley position information) of the cable storage reel into four limit signals of full reel, pre-full reel, pre-empty reel and empty reel to feed back to the cable reel control system;

[0039] The detection device 4 is fixed with bolts to the buffer type cable guide frame 3, wherein the detection device 4 includes a pre-cable loose limit switch 4-1, a first direction limit switch 4-2, a second direction limit switch 4-3, an over-tightening limit switch 4-4, a sensing plate 4-5, a detection swing rod 4-6 and a protection box 4-7; the detection swing rod 4-6 is hinged with the protection box 4-7, and the detection swing rod 4-6 is connected to the cable guide frame swing rod 5 through a connecting rod 6. When the cable guide frame swing rod 5 swings, the detection swing rod 4-6 can swing with the cable guide frame swing rod 5 at the same angle and in the same direction; a plurality of arc-shaped sensing plates 4-5 are arranged on the detection swing rod 4-6, and the arc-shaped sensing plates 4-5 are used to detect When the detection swing rod 4-6 swings to a certain position, the corresponding pre-cable loosening limit switch 4-1, the first direction limit switch 4-2, the second direction limit switch 4-3 or the over-tightening limit switch 4-4 is triggered; specifically, in the present embodiment, six induction plates 4-5 are arranged on the detection swing rod 4-6, specifically, an arc-shaped induction plate 4-5 extending to the left and an arc-shaped induction plate 4-5 extending to the right are arranged above the hinged position of the detection swing rod 4-6 and the protection box 4-7; the arc-shaped induction plate 4-5 extending to the left is used to trigger the pre-cable loosening limit switch 4-1; the arc-shaped induction plate 4-5 extending to the right is used to trigger the over-tightening limit switch 4-4;

[0040] Two arc-shaped induction plates 4-5 extending to the left and two arc-shaped induction plates 4-5 extending to the right are arranged below the hinged position of the detection swing rod 4-6 and the protection box 4-7, and the two arc-shaped induction plates 4-5 extending to the left and the two arc-shaped induction plates 4-5 extending to the right located below are arranged alternately, and one arc-shaped induction plate 4-5 extending to the left is used to trigger the pre-cable loosening limit switch 4-1, and one is used to trigger the first direction limit switch 4-2; one arc-shaped induction plate 4-5 extending to the right is used to trigger the second direction limit switch 4-3, and one is used to trigger the over-tightening limit switch 4-4;

[0041] Furthermore, the upper part of the cable guide frame swing arm 5 is bolted to the buffer cable guide frame 3, but the cable guide frame swing arm 5 can swing; the cable reel electronic control system detects the working status of the cable reel in real time according to the model issued by the cam limit switch 1 and the detection device 4, controls the output torque and speed of the motor, and ensures that the tension on the cable is always within the allowable value range and is not damaged.

[0042] The specific working process of the utility model is as follows:

[0043] The cam limit switch 1 converts the cable storage information (trolley position information) of the cable storage drum into four limit signals of full drum, pre-full drum, pre-empty drum and empty drum, and feeds them back to the cable reel control system;

[0044] When the cable storage information of the cable reel is in the pre-full reel, the cable reel control system logic determines that the trolley is in the cable pit state at this time, the cable guide frame swing rod 5 is in the middle position, and the induction plate 4-5 does not trigger the loose cable limit switch 4-1, the first direction limit switch 4-2, the second direction limit switch 4-3, and the over-tight limit switch 4-4;

[0045] When the trolley moves to the left, and the cable storage information of the cable reel is not in the pre-full reel or the empty reel, the cable is gradually tightened, driving the cable guide swing rod 5 to swing to the left, and the induction plate 4-5 in the control box triggers the first direction limit switch 4-2 and the cable loosening limit switch 4-1; the electronic control system determines the direction of the trolley at this time, and the cable reel is in normal movement state;

[0046] When the trolley moves to the right, and the cable storage information of the cable reel is not in the pre-full reel or the empty reel, the cable is gradually tightened, driving the cable guide swing rod 5 to swing to the right, and the induction plate 4-5 in the control box triggers the second direction limit switch 4-3 and the cable loosening limit switch 4-1; the electronic control system determines the direction of the trolley at this time, and the cable reel is in normal movement state;

[0047] When the trolley moves to the left, the cable is too loose, the induction plate 4-5 triggers the first direction limit switch 4-2, and the loose cable limit switch 4-1 is not triggered. When the trolley moves to the right, the cable is too loose, the induction plate 4-5 triggers the second direction limit switch 4-3, and the loose cable limit switch 4-1 is not triggered. At this time, the cable reel control system determines that the cable is loose, and the electric control system automatically increases the motor reel driving torque until the loose cable limit switch 4-1 is triggered again. The motor automatically restores normal torque to make the cable retraction and release consistent with the trolley travel speed. Figure 6 This is a schematic diagram of the cable reel in the loose cable state;

[0048] When there is an impact during the movement of the trolley or the torque of the cable reel is too large, the cable tension will overcome the force set by the spring buffer, causing the cable guide device to tilt as a whole. At this time, the induction plate 4-5 triggers the loose cable limit switch 4-1, the first direction limit switch 4-2 or the second direction limit switch 4-3, and the over-tight limit switch 4-4; at this time, the electronic control system sends an emergency stop fault signal and stops the vehicle to ensure that the cable is not broken due to excessive tension. Figure 7 This is a schematic diagram showing that the cable reel is in an overtightened state.

[0049] Finally, it should be noted that relational terms such as first and second are merely used to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

[0050] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A cable reel guide device with cable protection for a crane, characterized in that: It includes a detection device installed on a cable guide frame and a cable guide frame swing arm; the detection device includes a pre-cable loosening limit switch, a first direction limit switch, a second direction limit switch, an over-tightening limit switch, a sensing plate, and a detection swing arm; the detection swing arm is connected to the cable guide frame swing arm through a connecting rod, and swings at the same angle and in the same direction as the cable guide frame swing arm at any time; a plurality of arc-shaped sensing plates are arranged on the detection swing arm, and the arc-shaped sensing plates are used to trigger the corresponding pre-cable loosening limit switch, the first direction limit switch, the second direction limit switch or the over-tightening limit switch when the detection swing arm swings to the corresponding position.

2. The cable reel guide device with cable protection for crane according to claim 1, characterized in that: The pre-cable loosening limit switch is triggered by two arc-shaped induction plates, one of which is arranged on the upper part of the detection swing rod and the other is arranged on the lower part of the detection swing rod.

3. The cable reel guide device with cable protection for crane according to claim 1, characterized in that: The first direction limit switch is triggered by an arc-shaped sensing plate.

4. The cable reel guide device with cable protection for crane according to claim 1, characterized in that: The second direction limit switch is triggered by an arc-shaped induction plate.

5. The cable reel guide device with cable protection for crane according to claim 1, characterized in that: The overtightening limit switch is triggered by two arc-shaped induction plates, one of which is arranged on the upper part of the detection swing rod and the other is arranged on the lower part of the detection swing rod.

6. The cable reel guide device with cable protection for crane according to claim 1, characterized in that: The detection device also includes a protection box, the detection swing arm is hinged to the protection box, a pre-cable loosening limit switch and a first direction limit switch are arranged on one side of the hinged position, and a second direction limit switch or an over-tightening limit switch is arranged on the other side.

7. The cable reel guide device with cable protection for crane according to claim 1, characterized in that: Six arc-shaped induction plates are arranged on the detection swing rod, an arc-shaped induction plate extending to the left and an arc-shaped induction plate extending to the right are arranged above the hinge position of the detection swing rod and the protection box; two arc-shaped induction plates extending to the left and two arc-shaped induction plates extending to the right are arranged below the hinge position of the detection swing rod and the protection box.

8. The cable reel guide device with cable protection for crane according to claim 1, characterized in that: Of the two arc-shaped induction plates located above the hinged position of the detection swing arm and the protection box, the arc-shaped induction plate extending to the left is used to trigger the pre-cable loosening limit switch; the arc-shaped induction plate extending to the right is used to trigger the over-tightening limit switch.

9. The cable reel guide device with cable protection for crane according to claim 1, characterized in that: Two arc-shaped induction plates extending to the left and two arc-shaped induction plates extending to the right located below the hinged position of the detection swing arm and the protection box are arranged alternately. One arc-shaped induction plate extending to the left is used to trigger the pre-cable loosening limit switch, and the other arc-shaped induction plate extending to the left is used to trigger the first direction limit switch; one arc-shaped induction plate extending to the right is used to trigger the second direction limit switch, and the other arc-shaped induction plate extending to the right is used to trigger the over-tightening limit switch.

Images