A limiter for wire rope hoisting

Abstract

The invention relates to the technical field of lifting limit, and discloses a limiter for lifting wire rope, comprising: a swing rod, a two-way reset component, a movable electrode, a fixed electrode, a lifting platform, a one-way reset component, a travel switch and a rope clamping component; the middle part of the swing rod is installed for vertical rotation; the swing rod is swung up and down by an external force respectively, and after the external force is released, the two-way reset component resets the swing rod; the movable electrode is connected to the second end of the swing rod, and the swing rod can swing up and down to separate the movable electrode from the fixed electrode; the lifting platform is moved downward by an external force to drive the swing rod to release the external force, and the one-way reset component causes the lifting platform to rise and reset; the travel switch detects the position of the wire rope through a contact; when the travel switch detects the wire rope, the rope clamping component clamps the wire rope, and the wire rope provides a downward driving force for the lifting platform; the limiter of the invention can effectively prevent the phenomenon of over-release of the wire rope and the phenomenon of top collision of a wire rope hanging hook group.

Description

Technical Field

[0001] The invention relates to the technical field of lifting limit, and in particular to a limiter for lifting with a wire rope. Background Art

[0002] Lifting equipment that uses wire ropes to lift and hoist is widely used in the lifting field, such as various electric hoists, various lifting trolleys, etc. In the above lifting equipment, the wire rope is retracted and released by the drum to suspend the pulley hook group and lift it up and down, and the heavy object is lifted by the hook. The way of retracting and releasing the wire rope by the drum is that one end of the wire rope is fixed, and the other end passes through the pulley hook group and is wrapped around the wire rope, so that the lifting and lowering can be achieved by rotating the drum.

[0003] In order to ensure the safety of lifting work, lifting equipment generally uses limiters to limit lifting actions and reduce risks. This is reflected in wire rope lifting work, and the phenomena of hook hitting the top and wire rope over-release should be strictly avoided. The hook hitting the top and hitting the equipment at high speed will cause great losses, requiring a long time and a lot of repairs and replacements, affecting production efficiency, and easily causing safety accidents; over-release of wire ropes may produce unsafe loads, and the use of non-standard wire ropes may cause unsafe loads, cause safety accidents, and increase the risk of wire rope breakage and empty rotation. However, in the prior art, among the limiters used in lifting work, the limiters used for wire rope lifting are often limited to preventing top hitting or over-release, and there is no limiter that can prevent top hitting and over-release at the same time. Summary of the invention

[0004] The object of the present invention is to provide a limiter for wire rope hoisting in order to solve the above-mentioned problems in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A limiter for wire rope hoisting, comprising:

[0007] A swing rod, the middle part of which is vertically rotatably mounted on the lower side of the drum for winding the wire rope, and the first end of the swing rod is located above the hook assembly;

[0008] A two-way reset assembly supporting the swing rod, the swing rod is subjected to external force and swings up and down respectively, and the two-way reset assembly resets the swing rod after the external force is released;

[0009] A movable electrode and a fixed electrode in sliding contact for supplying power to the reel drive motor, wherein the movable electrode is connected to the second end of the swing rod, and the swing rod can swing upward or downward to separate the movable electrode from the fixed electrode;

[0010] A lifting platform is located at the lower side of the drum and at the upper side of the first end of the swing rod;

[0011] One-way reset assembly: the lifting platform is driven downward by external force to drive the swing arm, and after the external force is released, the one-way reset assembly makes the lifting platform rise and reset;

[0012] The travel switch installed on the lifting platform detects the position of the wire rope through the contact;

[0013] The rope clamping assembly installed on the lifting platform clamps the wire rope when the travel switch detects the wire rope, and the wire rope provides downward driving force for the lifting platform.

[0014] Furthermore, an extension frame is provided at the first end of the swing rod.

[0015] Furthermore, the bidirectional reset assembly includes a driving column, a movable frame, a telescopic guide rod and a first spring. The driving column is connected to the rocker arm and extends into the movable frame. The telescopic guide rod supports the movable frame to move back and forth. The first spring is sleeved on the outside of the telescopic guide rod to provide power for resetting the movable frame.

[0016] Furthermore, the fixed electrode is arc-shaped and also includes an insulating frame for mounting the fixed electrode; when the swing arm is not subjected to external force, the movable electrode contacts the middle part of the fixed electrode.

[0017] Furthermore, the one-way reset assembly includes a fixed plate, a first guide rod, a disc and a second spring. The fixed plate is located on the upper side of the lifting platform, the first guide rod is connected to the upper side of the lifting platform and slides through the fixed plate, the disc is connected to the upper side of the first guide rod, and the second spring is sleeved on the outer side of the first guide rod between the disc and the fixed plate, and the second spring provides power for resetting the lifting platform.

[0018] Furthermore, the lifting platform is provided with a notch, which corresponds to the place where the wire rope is retracted and released; the travel switch is installed inside the notch.

[0019] Furthermore, the rope clamping assembly includes a fixed clamping block and a movable clamping block respectively located on both sides of the notch, an automatic telescopic rod driving the movable clamping block is installed on the lifting platform, a second guide rod is connected to the side of the movable clamping block facing away from the fixed clamping block, and the second guide rod is slidably connected to the lifting platform.

[0020] Furthermore, it also includes a first rangefinder and a second rangefinder. The first rangefinder is installed on the lifting platform and corresponds to the wire rope retraction and release position; the second rangefinder is installed on the fixed end of the wire rope and corresponds to the hook group.

[0021] Furthermore, the first rangefinder and the second rangefinder are both connected to an alarm light and a buzzer.

[0022] Furthermore, the first rangefinder and the second rangefinder both divide the distance range of the measuring object into three sections, which are, from far to near, a safety zone, a warning zone, and a risk zone; the alarm light is a three-color alarm light; when the measuring object is located in each of the three sections, different colors of the three-color alarm light light up.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The limiter of the present invention is provided with a swing rod that swings in both directions and can be reset. The swing of the swing rod can realize the coordination and separation of the movable electrode and the fixed electrode that control the power supply of the drum; when the hook impacts the swing rod upward and causes the swing rod to swing upward, the drum drive can be powered off to realize the anti-top protection; when the wire rope is over-released, the wire rope is connected to the wire rope through the rope clamping assembly, and the wire rope can drive the lifting platform to descend, thereby causing the swing rod to swing downward to power off the drum drive to realize the anti-over-release protection, thereby effectively preventing the wire rope from being over-released and the wire rope hanging hook group from being top-hit;

[0025] The bidirectional reset assembly of the present invention can make the swing arm automatically reset after the external force is released, and the unidirectional reset assembly can make the lifting platform automatically reset after the external force is released, which is convenient for debugging after limiting; the present invention detects the position of the wire rope through the travel switch to realize the rope clamping of the rope clamping assembly, so that the lifting platform and the wire rope are connected and linked, so that the lifting platform descends to make the swing arm move and then the drum drive is powered off, so as to avoid further release of the wire rope and achieve the effect of safety and over-release prevention;

[0026] The present invention realizes three-stage zoned limit monitoring of over-release safety limit distance and top-impact safety limit distance through a distance meter, and effectively prompts the lifting equipment operator through an alarm light and a buzzer, so that the operator can clearly understand the safety status of the wire rope, effectively reducing the number of times the limit structure is triggered, thereby reducing the maintenance and debugging frequency of the lifting equipment, ensuring the normal operation and high lifting efficiency of the lifting equipment, and protecting the limit action structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure from the first viewing angle of the present invention.

[0028] Figure 2 It is a schematic diagram of the main structure of the present invention.

[0029] Figure 3 It is a schematic diagram of the three-dimensional structure from a second viewing angle of the present invention.

[0030] Figure 4 It is a schematic diagram of the three-dimensional structure of the bidirectional reset assembly of the present invention from the first perspective.

[0031] Figure 5 It is a schematic diagram of the stereoscopic structure of the bidirectional reset assembly of the present invention from a second viewing angle.

[0032] Figure 6 It is a schematic diagram of the three-dimensional structure of the lifting platform of the present invention from the first viewing angle.

[0033] Figure 7 It is a schematic diagram of the three-dimensional structure of the lifting platform of the present invention from a second viewing angle.

[0034] Figure 8 It is a schematic diagram of the long-distance limit prompt of the present invention.

[0035] In the figure: 1. pendulum; 2. two-way reset assembly; 3. movable electrode; 4. fixed electrode; 5. lifting platform; 6. one-way reset assembly; 7. travel switch; 8. rope clamp assembly; 9. first rangefinder; 10. second rangefinder; 11. three-color alarm light; 12. buzzer;

[0036] 13. Wire rope; 14. Drum; 15. Hook assembly; 16. Casing;

[0037] 101, extension frame; 201, driving column; 202, movable frame; 203, telescopic guide rod; 204, first spring; 401, insulating frame; 501, notch; 502, lower extension frame; 503, roller; 601, fixed plate; 602, first guide rod; 603, disc; 604, second spring; 701, elastic block; 801, fixed clamp block; 802, movable clamp block; 803, automatic telescopic rod; 804, second guide rod. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0039] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The specific embodiment of the limiter for wire rope lifting provided by the present invention is as follows:

[0043] See also Figure 1-8 The limiter for lifting and hoisting of wire rope comprises a swing arm 1, a two-way reset assembly 2, a movable electrode 3, a fixed electrode 4, a lifting platform 5, a one-way reset assembly 6, a travel switch 7 and a rope clamp assembly 8. The lifting and hoisting equipment in this embodiment comprises: a hook assembly 15, a wire rope 13 and a drum 14 for retracting and releasing the wire rope 13, and a housing 16 is provided on the outside of the drum 14. One end of the wire rope 13 is fixed on the outside of the housing 16, and the other end of the wire rope 13 passes through the pulley of the hook assembly 15 and then is wound on the outside of the drum 14.

[0044] The upper side of the housing 16 shields the drum 14, and the lower side of the housing 16 has an opening for the wire rope 13 to pass through, that is, the housing 16 is in a semicircular tube shape. The vertical walls at both ends of the housing 16 extend downward. The middle part of the swing rod 1 is vertically rotatably installed on the lower side of the drum 14 for winding the wire rope 13. Specifically, the middle part of the swing rod 1 passes through the lower part of the vertical wall at one end of the housing 16. The lower part of the vertical wall is provided with a through hole for the swing rod 1 to pass through, and the through hole has a sufficient volume to allow the swing rod 1 to swing.

[0045] The first end of the swing rod 1, i.e., the inner end of the swing rod 1 passing through the vertical wall of the outer shell 16, is located above the hook group 15; when the hook group 15 moves upward, the hook group 15 will not directly hit the reel 14, but will first act on the lower side of the swing rod 1 to make the swing rod 1 swing.

[0046] In this embodiment, an extension frame 101 is provided at the first end of the swing rod 1 ; the extension frame 101 increases the horizontal area of ​​the end of the swing rod 1 , so that the hook assembly 15 can drive the swing rod 1 without crossing the swing rod 1 .

[0047] The two-way reset assembly 2 supports the rocker arm 1. The rocker arm 1 swings up and down respectively under external force. After the external force is released, the two-way reset assembly 2 resets the rocker arm 1. In this embodiment, the two-way reset assembly 2 includes a driving column 201, a movable frame 202, a telescopic guide rod 203 and a first spring 204. The driving column 201 is connected to the rocker arm 1 and extends into the movable frame 202. The telescopic guide rod 203 supports the movable frame 202 to move back and forth. The first spring 204 is sleeved on the outside of the telescopic guide rod 203 to provide power for resetting the movable frame 202.

[0048] The telescopic guide rod 203 is connected between the housing 16 and the movable frame 202, so that the movable frame 202 can only move in one direction. The first spring 204 is connected between the housing 16 and the movable frame 202. The driving column 201 passes through the swing rod 1. The movable frame 202 includes two bar frames, which are connected as a whole. The two ends of the driving column 201 on both sides of the swing rod 1 extend into the two bar frames. The first spring 204 and the telescopic guide rod 203 correspond to each other and four are set. The telescopic guide rod 203 adopts a damping telescopic rod, which has damping when telescoping and can reduce the shaking of the movable frame 202 when resetting, so that the movable frame 202 and the swing rod 1 are quickly stabilized. In the natural state, due to the tensioning effect of the first spring 204, the direction of the rocker arm 1 is perpendicular to the vertical wall of the shell 16. When the rocker arm 1 swings upward or downward, the movable frame 202 is close to the shell 16 to compress the first spring 204 to store energy. After the external force is released, the energy-stored first spring 204 returns to its original state to reset the movable frame 202 and the rocker arm 1, which is convenient for the automatic reset of the limiter after the equipment is restored and debugged after the limit, and also supports the bidirectional swing reset of the rocker arm 1.

[0049] The movable electrode 3 and the fixed electrode 4 are in sliding contact with each other to power the motor driving the reel 14, that is, the movable electrode 3 and the fixed electrode 4 are connected in series as switches in the power supply circuit of the motor driving the reel 14. The movable electrode 3 is connected to the second end of the swing rod 1, and the swing rod 1 can be swung up or down at a certain angle to separate the movable electrode 3 from the fixed electrode 4; the fixed electrode 4 is arc-shaped, and also includes an insulating frame 401 for mounting the fixed electrode 4, and the insulating frame 401 is connected to the housing 16; when the swing rod 1 is not subjected to external force, the movable electrode 3 contacts the middle of the fixed electrode 4.

[0050] Under normal conditions, the swing arm 1 is not subjected to stress, the drum 14 is powered normally, and the operator can freely operate the lifting equipment. When the swing arm 1 is driven by external force, taking the phenomenon of the hook group 15 hitting the top as an example, when the hook group 15 rises too high, the hook group 15 drives the first end extension frame 101 of the swing arm 1 upward, so that the first end of the swing arm 1 rises and the second end of the swing arm 1 falls, so that the movable electrode 3 falls and slides along the surface of the fixed electrode 4. When the swing arm 1 swings a certain angle, the movable electrode 3 exceeds the range of the fixed electrode 4 and separates from the fixed electrode 4, so that the drum 14 drive is powered off, and the drum 14 cannot move, preventing the hook group 15 from continuing to rise and hitting the top. In this embodiment, the drum 14 drive motor is a special brake motor for lifting, and the motor automatically brakes after power failure.

[0051] The lifting platform 5 is a horizontal plate-shaped structure, and is located at the lower side of the drum 14 and at the upper side of the first end of the swing rod 1 ; the descent of the lifting platform 5 can drive the first end of the swing rod 1 to swing downward.

[0052] The one-way reset assembly 6 is used to support the lifting platform 5. After the lifting platform 5 is moved downward by an external force and the rocker arm 1 is driven to release the external force, the one-way reset assembly 6 causes the lifting platform 5 to rise and reset. Specifically, the one-way reset assembly 6 includes a fixed plate 601, a first guide rod 602, a disc 603 and a second spring 604. The fixed plate 601 is located on the upper side of the lifting platform 5. The first guide rod 602 is connected to the upper side of the lifting platform 5 and slides through the fixed plate 601. The disc 603 is connected to the upper side of the first guide rod 602. A second spring 604 is sleeved on the outer side of the first guide rod 602 between the disc 603 and the fixed plate 601. The second spring 604 provides power for resetting the lifting platform 5.

[0053] There are two fixing plates 601, which are connected to both sides of the outer shell 16. Two first guide rods 602 are respectively arranged at both ends of the lifting platform 5, so that the lifting platform 5 is located directly below the reel 14. A through hole is provided on the fixing plate 601, which is slidably matched with the first guide rod 602. The first guide rod 602 and the inner wall of the through hole have damping, and the damping is formed by the friction surface of the inner wall of the through hole. The friction damping can reduce the shaking of the lifting platform 5 when it is reset, so that the lifting platform 5 can be quickly and stably.

[0054] A notch 501 is provided on the lifting platform 5, and the notch 501 corresponds to the retracting and releasing position of the wire rope 13. Since the retracting and releasing position of the wire rope 13 is always located on one side of the drum 14, and as the wire rope 13 is retracted and released, the axial position of the wire rope 13 along this side of the drum 14 changes. Therefore, during the retracting and releasing process of the wire rope 13, only the inclination angle is different. The notch 501 can always correspond to the retracting and releasing position of the wire rope 13, and a chamfer is set at the outer end of the notch 501 so that the wire rope 13 can enter the notch 501.

[0055] A travel switch 7 is installed inside the notch 501, and the travel switch 7 detects the position of the wire rope 13 through the action of its contacts; when the wire rope 13 is released and more than three turns are left, the retracted part of the wire rope 13 enters the inside of the notch 501 and continues to be released, and the retracted part of the wire rope 13 compresses the contact of the travel switch 7, and the travel switch 7 can detect the wire rope 13. The travel switch 7 transmits the information to the controller in the control system, and the controller controls the rope clamping assembly 8 to clamp the wire rope 13. The wire rope 13 continues to be released to drive the lifting platform 5 to descend.

[0056] In this embodiment, under normal conditions, there is a gap between the lower side of the lifting platform 5 and the swing rod 1. Only when the lifting platform 5 descends a certain distance will the first end of the swing rod 1 be triggered to swing downward; this will not affect the upward swing of the first end of the swing rod 1. When the wire rope 13 is released and more than three turns are left, the lifting platform 5 descends, the lifting platform 5 triggers the swing rod 1 and then causes the first end of the swing rod 1 to swing downward, and the second end of the swing rod 1 swings upward at a certain angle, the movable electrode 3 is separated from the fixed electrode 4, and the drive motor of the drum 14 is powered off. At this time, the wire rope 13 is released for the remaining three turns, and three-turn over-discharge protection is achieved.

[0057] In this embodiment, an elastic block 701 is provided between the travel switch 7 and the inner wall of the notch 501 . The elastic block 701 is made of rubber and supports the travel switch 7 , providing a certain buffer protection for the travel switch 7 to prevent the travel switch 7 from being damaged.

[0058] The rope clamping assembly 8 is installed at the lower side of the lifting platform 5. When the travel switch 7 detects the wire rope 13, the rope clamping assembly 8 clamps the wire rope 13, and the wire rope 13 is released to provide a downward driving force for the lifting platform 5. The rope clamping assembly 8 includes a fixed clamping block 801 and a movable clamping block 802 respectively located on both sides of the notch 501. An automatic telescopic rod 803 driving the movable clamping block 802 is installed on the lifting platform 5. The movable clamping block 802 is connected to a second guide rod 804 on the side facing away from the fixed clamping block 801. The second guide rod 804 is slidably connected to the lifting platform 5.

[0059] The fixed clamp block 801 and the movable clamp block 802 are provided with anti-skid grooves on the opposite sides to improve the firmness of the clamping and avoid slipping; the fixed clamp block 801 protrudes to the position corresponding to the notch 501, and the end of the fixed clamp block 801 facing the entrance end of the notch 501 is chamfered to avoid interference with the wire rope 13 contacting the travel switch 7. Two second guide rods 804 are provided, and the automatic telescopic rod 803 can be an electric telescopic rod or a hydraulic telescopic rod.

[0060] A lower extension frame 502 is provided at the lower middle side of the lifting platform 5, and a roller 503 is rotatably installed at the lower end of the lower extension frame 502. The lower end of the lower extension frame 502 is lower than the rope clamping assembly 8, and the roller 503 is used to directly contact the first end of the swing rod 1 to drive the swing rod 1 to swing.

[0061] Although the swing arm 1 in this embodiment can be automatically reset, in the prior art including the limit structure of this embodiment, after the limiter is triggered, the lifting equipment needs to be debugged to restore its own function. Taking this embodiment as an example, the limit structure avoids the phenomenon of top collision and over-discharge, but the drum 14 cannot be operated after power failure, and it is necessary to use the backup power supply to carefully operate the drum 14 to rotate to the normal position. The process has certain risks and seriously affects the lifting efficiency and delays the lifting work. The limiter is not a brake, and it is easy to be damaged if it is triggered frequently. Some operators cannot brake in time due to the existence of the limiter and unlimited operation, resulting in great losses. In addition, the sudden power failure braking caused by the limit trigger causes great damage to the lifting equipment itself.

[0062] Therefore, in this embodiment, remote limit indication is performed; a first laser rangefinder 9 and a second rangefinder 10 are set, the first rangefinder 9 is installed on the lifting platform 5 and corresponds to the retraction and release position of the wire rope 13; the second rangefinder 10 is installed at the fixed end of the wire rope 13 and corresponds to the hook group 15.

[0063] Both the first rangefinder 9 and the second rangefinder 10 divide the distance range of the distance measuring object into three sections, which are respectively the safety zone, the warning zone and the risk zone from far to near. According to the farthest distance from the far end of the axial span of the wire rope 13 at the retraction and release point to the first rangefinder 9 (close to the top-running state), 5% of the farthest distance in the direction away from the first rangefinder 9 is the over-release risk zone, the next 10% is the over-release warning zone, and the remaining 85% is the over-release safety zone. The swing arm 1 is easily triggered in the over-release risk zone; according to the farthest distance from the second rangefinder 10 to the hook group 15 (close to the over-release state), 5% of the farthest distance in the direction away from the second rangefinder 10 is the top-running risk zone, the next 10% is the top-running warning zone, and the remaining 85% is the top-running safety zone. The swing arm 1 is easily triggered in the top-running risk zone.

[0064] The first rangefinder 9 and the second rangefinder 10 are both connected with an alarm light and a buzzer 12; the first rangefinder 9 and the second rangefinder 10 are independent of each other and do not interfere with each other. When the wire rope 13 detected by the first rangefinder 9 is in the risk zone, it indicates that it is about to be over-released, and the hook group 15 detected by the second rangefinder 10 is in the safe zone. When the hook group 15 detected by the second rangefinder 10 is in the risk zone, it indicates that it is about to hit the top, and the wire rope 13 detected by the first rangefinder 9 is in the safe zone. Therefore, two alarm lights and two buzzers 12 are set, which are used to indicate the risk of over-release detected by the first rangefinder 9 and the risk of hitting the top detected by the second rangefinder 10, respectively.

[0065] The controller receives signals from the first rangefinder 9 and the second rangefinder 10, and controls the corresponding alarm lights and buzzers 12 to give warnings. In the present embodiment, the alarm lights and buzzers 12 are installed in the lifting operation room, and the alarm light is a three-color alarm light 11 having red, yellow and green colors; when the ranging object is located in each of the three sections, lights of different colors of the three-color alarm light 11 light up. In the present embodiment, the green light of the corresponding three-color alarm light 11 lights up in the safe zone, the yellow light of the three-color alarm light 11 lights up in the warning zone, and the red light of the three-color alarm light 11 lights up in the risk zone. The buzzer 12 only sounds to alert the operator in the risk zone. Figure 8 The schematic diagram of the long-distance limit prompt of the first distance meter 9 shown is also applicable to the second distance meter 10 .

[0066] Through the distance meter and three-zone remote limit prompt, the yellow light comes on to prompt deceleration. When entering the risk area, the alarm light turns red and the buzzer 12 sounds, prompting the operator to brake to avoid further action to trigger the swing arm 1, thereby preventing the drum 14 drive motor from losing power and avoiding the harm of automatic braking when the lifting equipment loses power, which is conducive to ensuring the continuous and efficient operation of the lifting equipment.

[0067] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A limiter for wire rope hoisting, characterized in that: include: A swing rod (1), the middle portion of the swing rod (1) being mounted vertically and rotatably on the lower side of a drum (14) for winding up the steel wire rope (13), and the first end of the swing rod (1) being located above the hook assembly (15); A two-way reset assembly (2) supporting the swing rod (1), wherein the swing rod (1) is swung upward and downward respectively by an external force, and when the external force is released, the two-way reset assembly (2) resets the swing rod (1); A movable electrode (3) and a fixed electrode (4) that are in sliding contact and that supply power to a drive motor of a reel (14); the movable electrode (3) is connected to the second end of a swing rod (1); and the swing rod (1) can separate the movable electrode (3) from the fixed electrode (4) by swinging upward or downward; A lifting platform (5) is located below the reel (14) and above the first end of the swing rod (1); A one-way reset component (6), the lifting platform (5) is driven downward by an external force to drive the swing rod (1), and after the external force is released, the one-way reset component (6) causes the lifting platform (5) to rise and reset; A travel switch (7) installed on the lifting platform (5) detects the position of the wire rope (13) through a contact; A rope clamping assembly (8) installed on the lifting platform (5), when the travel switch (7) detects the steel wire rope (13), the rope clamping assembly (8) clamps the steel wire rope (13), and the steel wire rope (13) provides a downward driving force for the lifting platform (5); An extension frame (101) is provided at the first end of the swing rod (1); The bidirectional reset assembly (2) comprises a driving column (201), a movable frame (202), a telescopic guide rod (203) and a first spring (204); the driving column (201) is connected to the swing rod (1) and extends into the movable frame (202); the telescopic guide rod (203) supports the movable frame (202) to reciprocate; and the first spring (204) is sleeved on the outside of the telescopic guide rod (203) to provide power for resetting the movable frame (202); The fixed electrode (4) is arc-shaped and also includes an insulating frame (401) for mounting the fixed electrode (4); when the swing rod (1) is not subjected to external force, the movable electrode (3) contacts the middle of the fixed electrode (4); The one-way reset assembly (6) comprises a fixed plate (601), a first guide rod (602), a disc (603) and a second spring (604); the fixed plate (601) is located on the upper side of the lifting platform (5); the first guide rod (602) is connected to the upper side of the lifting platform (5) and slides through the fixed plate (601); the disc (603) is connected to the upper side of the first guide rod (602); a second spring (604) is sleeved on the outer side of the first guide rod (602) between the disc (603) and the fixed plate (601); the second spring (604) provides power for resetting the lifting platform (5); The lifting platform (5) is provided with a notch (501), the notch (501) corresponding to the retractable position of the steel wire rope (13); the travel switch (7) is installed inside the notch (501); The rope clamping assembly (8) comprises a fixed clamping block (801) and a movable clamping block (802) respectively located on both sides of the notch (501); an automatic telescopic rod (803) for driving the movable clamping block (802) is installed on the lifting platform (5); a second guide rod (804) is connected to the side of the movable clamping block (802) facing away from the fixed clamping block (801); and the second guide rod (804) is slidably connected to the lifting platform (5); It also includes a first distance meter (9) and a second distance meter (10), wherein the first distance meter (9) is installed on the lifting platform (5) and corresponds to the location where the steel wire rope (13) is retracted and released; and the second distance meter (10) is installed at the fixed end of the steel wire rope (13) and corresponds to the hook assembly (15); The first distance meter (9) and the second distance meter (10) are both connected to an alarm light and a buzzer (12); The first rangefinder (9) and the second rangefinder (10) both divide the distance range of the distance measuring object into three sections, which are, from far to near, a safety zone, a warning zone and a risk zone; the alarm light is a three-color alarm light (11); when the distance measuring object is located in each of the three sections, lights of different colors of the three-color alarm light (11) light up.

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