Loosening prevention and rope breakage detection mechanism for rigging

Abstract

The invention relates to the technical field of safety detection of hoisting equipment, in particular to a rigging looseness prevention and rope breakage detection mechanism which comprises a base, a spring assembly, a sensor module and a control unit, the spring assembly comprises a spring seat, a mandrel and a pre-pressing spring, the spring seat is in sliding connection with the base through the mandrel, and the mandrel is sleeved with the pre-pressing spring; the spring seat is fixedly connected with one end of the rigging, and the pre-pressing spring deforms along with the change of the tensioning force of the rigging; the sensor module comprises a first sensor and a second sensor, and the first sensor is used for detecting a loosening threshold deformation signal of the pre-pressing spring when the rigging is in a pre-tightening state; the second sensor is used for detecting a rope breaking threshold deformation signal of the pre-pressing spring when the rigging is in a rope breaking failure state; when the control unit receives a signal of the first sensor, the control unit controls the rigging to stop lowering; and when the signal of the second sensor is received, the second sensor controls the hoisting equipment to stop and starts the mechanical braking device. The device is simple in structure, low in cost and easy to install and maintain.

Description

Technical Field

[0001] The invention relates to the technical field of safety detection of lifting equipment, and in particular to a rigging anti-loosening and rope-breaking detection mechanism. Background Art

[0002] In the fields of industrial production, construction, logistics and transportation, lifting equipment is widely used to lift and lower loads (such as grabs, slings and heavy objects) through rigging (such as wire ropes, chains, etc.). During the lifting process, whether it is picking up or placing parts, in order to ensure that the clamping part and the load are clamped in place, or placed in place when placing parts, it is usually necessary to lower the rigging to a certain extent to make it begin to relax. However, due to the subjectivity of manual operation or the lag of signal transmission, the rigging often becomes too loose. Once the rigging is too loose, it is very likely to hit other equipment around it, which will cause safety hazards.

[0003] In order to solve the above problems, a method for grabbing materials with a four-rope grab with patent application number 202410693039.X proposes a compensation detection device, which can automatically compensate for the slack of the lifting wire rope and the opening and closing wire rope when the four-rope grab contacts the material or touches the bottom, so that the lifting wire rope and the opening and closing wire rope are always in a pre-tightened state, thereby preventing the lifting wire rope and the opening and closing wire rope from dragging in the groove, and because the compensation amount of the compensation detection device can be compressed by the grab's own gravity, the grab has room to descend. The grab automatically descends under the action of its own gravity while grabbing the material, so that the grab can grab as much material as possible and improve the grabbing efficiency.

[0004] However, the above technical solution still has some shortcomings. First, its structure is relatively complex, which increases the cost of manufacturing and maintenance; second, mechanical parts are prone to wear after long-term use, which leads to a gradual decrease in detection accuracy, affecting the reliability and stability of the equipment.

[0005] At the same time, as a key component connecting the load and lifting equipment, the working status of the rigging is directly related to the stability and safety of the entire system, so monitoring the operating status is particularly important. Summary of the invention

[0006] The invention provides a rigging anti-loosening and rope-breaking detection mechanism to solve the technical problems of the existing rigging anti-loosening detection mechanism having a complex structure and high manufacturing and maintenance costs.

[0007] In order to solve the above problems, the present invention provides a rigging anti-loosening and rope-breaking detection mechanism, which adopts the following technical solutions:

[0008] A rigging anti-loosening and rope-breaking detection mechanism is used to detect the rigging status of a lifting device for lifting a load; the detection mechanism comprises:

[0009] The base is fixed on the platform, and has a limit plate on the top and a guide hole on the bottom;

[0010] The spring assembly includes a spring seat, a core shaft and a pre-stressed spring. The spring seat is slidably connected to the base through the core shaft. The core shaft passes through the guide hole of the base. The pre-stressed spring is arranged in the base and sleeved on the core shaft. One end of the rigging is fixedly connected to the spring seat, and the other end is pulled by the lifting equipment. The pre-stressed spring is deformed as the tension of the rigging changes, thereby driving the spring seat to move along the core shaft.

[0011] A sensor module is connected to the control unit and is used to detect a deformation signal of the preload spring and transmit the deformation signal to the control unit; the sensor module includes a first sensor and a second sensor, the first sensor is used to detect a loosening threshold deformation signal of the preload spring when the rigging is in a pre-tightened state; the second sensor is used to detect a rope breaking threshold deformation signal of the preload spring when the rigging is in a rope breaking failure state;

[0012] The control unit can receive the electrical signal of the sensor module to control the operation of the lifting equipment. When receiving the signal of the first sensor, the control unit controls the rigging to stop lowering; when receiving the signal of the second sensor, the control unit controls the lifting equipment to stop and activates the mechanical braking device to prevent the load from falling.

[0013] When the rigging is in normal working condition, the preload spring will produce a certain deformation according to the tension of the rigging. If the rigging is in the preloaded state, the first sensor will detect the loose threshold deformation signal of the preload spring and transmit the signal to the control unit. The control unit will control the rigging to stop lowering accordingly to solve the problem of the rigging being loose and touching the surrounding equipment. If the rigging fails due to rope breakage, the second sensor will detect the rope breakage threshold deformation signal of the preload spring and transmit the signal to the control unit. The control unit will control the lifting equipment to stop and start the mechanical brake device to prevent the load from falling and injuring people, thus ensuring safe operation.

[0014] As a preferred technical solution of the present invention, a sensing element is tightly connected above the preload spring, and the deformation signal is a position signal of the sensing element. The sensing element is located above the preload spring, and the position of the sensing element will change as the preload spring deforms. By detecting the position signal of the sensing element, the deformation degree of the preload spring can be accurately obtained.

[0015] As a preferred technical solution of the present invention, the sensing part is sleeved on the core shaft, the core shaft is a screw, and a nut is sleeved on the top of the sensing part. The sensing part is sleeved on the core shaft, and as the preload spring deforms, the sensing part moves up and down along the core shaft. The core shaft serves as a guide component to ensure the linearity and stability of the movement of the sensing part. The core shaft is in the form of a screw, which increases the friction between the sensing part and the sensing part, preventing unnecessary displacement of the sensing part in a non-working state. A nut is sleeved on the top of the sensing part, and the initial position and preload force of the sensing part can be adjusted by adjusting the position of the nut. This setting enables the detection mechanism to adapt to rigging of different specifications and different working environments.

[0016] As a preferred technical solution of the present invention, the sensor module is arranged on one side of the base to detect the position signal of the sensing element.

[0017] As a preferred technical solution of the present invention, the sensor module includes a proximity switch, a mechanical micro switch, a photoelectric sensor or a displacement sensor.

[0018] As a preferred technical solution of the present invention, the preload spring is treated with a coating for corrosion protection.

[0019] As a more preferred technical solution of the present invention, the anti-corrosion treatment of the coating is electroplating, and the coating is zinc plating, chromium plating, copper plating, tin plating or nickel plating. The coating material has good corrosion resistance.

[0020] The surface of the preload spring is treated with a coating to form a protective film to isolate the spring material from the external environment. The coating treatment can effectively prevent the performance degradation and shortened life of the spring due to corrosion during use, and improve the reliability and stability of the preload spring. The preload spring that has undergone anti-corrosion treatment can adapt to various harsh working environments, such as humid, salt spray and other environments, and has strong adaptability.

[0021] As a more preferred technical solution of the present invention, the control unit is also connected to an audible and visual alarm module, and when the second sensor signal is received, the audible and visual alarm signal is synchronously triggered.

[0022] The beneficial effects are:

[0023] The present invention provides a detection mechanism that can detect the loosening and broken rope of rigging in real time and accurately, and has a simple structure, low cost, and is easy to install and maintain. The detection mechanism sets a preload spring to link the rigging tension change, detects the spring compression through a sensor to determine the rigging state, and combines with a control system to achieve a rapid response to the critical preload and broken rope failure state of the rigging, ensuring that the rigging is always in a preloaded state and does not loosen and touch surrounding equipment, thereby causing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0025] Figure 1 It is a schematic diagram of the structure of the present invention, in which the lifting equipment is in a state of picking up / putting down objects, the rigging is in a state of being stretched straight with slight force (i.e., a pre-tightened state), the first sensor detects the presence of the sensing element, and the control unit controls the rigging to stop lowering;

[0026] Figure 2 for Figure 1 The partial enlarged view of part A in the figure, B represents the position of the induction member 5 when the lifting equipment is in the lifting state.

[0027] Description of reference numerals:

[0028] 1. Base; 2. Spring seat; 3. Mandrel; 4. Preload spring; 5. Induction element; 6. First sensor; 7. Second sensor. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0030] Any number of elements in the drawings is for illustration and not limitation, and any naming is for distinction only and does not have any limiting meaning.

[0031] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0032] like Figure 1 and 2A rigging anti-loosening and rope-breaking detection mechanism shown is used to detect the rigging status of a lifting equipment that lifts and lowers loads; the detection mechanism includes a base 1, a spring assembly, a sensor module and a control unit, the spring assembly includes a spring seat 2, a core shaft 3 and a pre-stressed spring 4, the spring seat 2 is slidably connected to the base 1 through the core shaft 3, the pre-stressed spring 4 is sleeved on the core shaft 3 and is encapsulated in the base 1, the spring seat 2 is fixedly connected to one end of the rigging, the pre-stressed spring 4 deforms as the rigging tension changes, and then drives the spring seat 2 to move along the core shaft 3; the sensor module is used to detect the deformation signal of the pre-stressed spring 4, and the sensor module is electrically connected or communicatively connected to the control unit; the control unit determines the state of the rigging (hoisting state, piece-taking anti-loosening state or rope breaking) according to the deformation signal of the pre-stressed spring 4 fed back by the sensor, and controls the operation of the lifting equipment.

[0033] The base 1 is fixed on a platform (such as a frame of a winch lifting mechanism), and a limit plate is provided on the top of the base 1 and a guide hole is provided on the bottom. The setting of the limit plate further limits the displacement of the core shaft 3 after the rigging rope breaks.

[0034] In other embodiments, a limiting buffer pad is provided between the spring seat 2 and the base 1 to buffer the spring return impact.

[0035] The core shaft 3 passes through the guide hole of the base 1 and can move in the guide hole along its axial direction. The bottom of the core shaft 3 is fixedly connected to the spring seat 2, and the core shaft 3 constrains the compression direction of the preload spring 4.

[0036] A sensing element 5 is tightly connected to the top of the pre-stress spring 4, and the position of the sensing element 5 changes as the pre-stress spring 4 is deformed. The sensor module detects the deformation signal of the pre-stress spring 4 by detecting the position of the sensing element 5. The pre-stress spring 4 has three deformation states, namely the first deformation state, the second deformation state and the third deformation state. When the pre-stress spring 4 is in the first deformation state, the lifting equipment is in a lifting state, and the rigging is in a tensioned stress state, which is the normal state of the rigging; when the pre-stress spring 4 is in the second deformation state, the lifting equipment is in a picking / placing state, and the rigging is in a slightly stressed straight state (i.e., a pre-tightened state, at which time the rigging is at the critical point of loosening); when the pre-stress spring 4 is in the third deformation state, the rigging is in a broken rope failure state.

[0037] The stiffness coefficient of the preload spring 4 is preferably 0-60 N / mm, more preferably 5-40 N / mm.

[0038] In this embodiment, the mandrel 3 is a screw rod, and the mandrel 3 is connected to the spring seat 2, the base 1, the spring, the induction member 5, and the nut from bottom to top. The mandrel 3 is threadedly connected to the spring seat 2, and the nut is threadedly connected to the mandrel 3. The position of the nut determines the telescopic length of the preload spring 4.

[0039] Of course, in other embodiments, the core shaft 3 may also be a sliding rod, which can be connected to the spring seat 2, the induction element 5 and other components through connecting parts such as pins and snap rings.

[0040] In order to improve the reliability and stability of the preload spring 4, the preload spring 4 is treated with a coating for corrosion protection. The coating for corrosion protection is electroplating, and the coating is zinc plating, chrome plating, copper plating, tin plating or nickel plating, and the coating material has good corrosion resistance. The surface of the preload spring 4 is electroplated to form a protective film, which isolates the erosion of the spring material by the external environment, and can effectively prevent the performance degradation and shortened life of the spring due to corrosion during use, thereby improving the reliability and stability of the preload spring 4. The preload spring 4 treated with corrosion protection can adapt to various harsh working environments, such as humid, salt spray and other environments, and has strong adaptability.

[0041] The sensor module includes a first sensor 6 and a second sensor 7. The first sensor 6 is arranged opposite to the position of the sensing element 5 when the preload spring 4 is in the second deformation state. When the sensing element 5 moves to the position with the deformation of the preload spring 4, the first sensor 6 can quickly and accurately detect the approach of the sensing element 5 and output a corresponding signal. The second sensor 7 is arranged above the first sensor 6. When the second sensor 7 detects the approach of the sensing element 5, it outputs a corresponding signal.

[0042] In this embodiment, the sensing element 5 is a metal plate, such as a flange, and the first sensor 6 and the second sensor 7 are proximity switches.

[0043] In other embodiments, the first sensor 6 and the second sensor 7 may also be mechanical micro switches, photoelectric sensors or displacement sensors. When the first sensor 6 and the second sensor 7 are Hall sensors, the induction element 5 is a magnetic ring.

[0044] The control unit receives the electrical signal from the sensor module, and outputs instructions according to the signal type, and performs hierarchical control: when the control unit receives the loose deformation threshold signal from the first sensor 6, the control unit determines that the rigging is in a critical pre-tightening state, generates a first-level shutdown instruction, and controls the lifting equipment to stop lowering the rigging; when the control unit receives the broken rope deformation threshold signal from the second sensor 7, it determines that the rigging is in a broken rope failure state, generates a second-level emergency braking instruction, triggers the lifting equipment power system to shut down, and at the same time locks the actuator's movement freedom, and starts the mechanical braking device to prevent the load from falling.

[0045] The mechanical brake device includes a hydraulic caliper brake and an electromagnetic safety lock. The electromagnetic safety lock engages the transmission gear under the secondary emergency brake command to achieve the braking function. The control unit is also connected to an audible and visual alarm module. When a secondary emergency brake command is received, an audible and visual alarm signal is synchronously triggered.

[0046] The spring seat 2 is fixedly connected to one end of the rigging, and the other end of the rigging is wound on the hoisting mechanism (such as a hoisting hoist) of the lifting equipment. The hoisting mechanism is used to retract and release the rigging to achieve lifting control; the hanging end of the rigging is connected to a sling, and the sling is provided with a clamping part for fixing or releasing the load. When the hoisting mechanism drives the rigging to rise and fall, the sling drives the load to complete the lifting operation. At the same time, the detection mechanism determines the change in the rigging tension by detecting the deformation of the preload spring 4 and then triggers a safety control signal.

[0047] When the rigging is not loaded or is in a loaded state (lifting state), the preload spring 4 is in a first deformation state, i.e., a tensioned state; when the clamping part of the lifting equipment needs to fix or release the load, the control unit controls the hoisting mechanism to lower the rigging, so that the sling starts to descend, and when the sling descends to the point where it can contact the load, the control unit controls the rigging to continue to descend, at which time the preload spring 4 is between the first deformation state and the second deformation state, and when the first sensor 6 detects the sensing element 5, the rigging is just in a pre-tensioned state (i.e., a loosening threshold, at which time the rigging is slightly stressed and stretched but not loose), and the control unit controls the hoisting mechanism to stop lowering the rigging; when the rigging breaks, the preload spring 4 is completely reset, the second sensor 7 detects the sensing element 5, triggering a rope break signal, the control unit starts an emergency braking command, the mechanical braking device starts to implement the braking function and triggers an audible and visual alarm signal at the same time.

[0048] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "upper", "top", "bottom" and other terms indicating orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

Claims

1. A rigging anti-loosening and rope-breaking detection mechanism, used to detect the rigging status of a lifting equipment for lifting loads; characterized in that: The testing agencies include: A base (1) is fixed on the platform, and has a limit plate on the top and a guide hole on the bottom; A spring assembly comprises a spring seat (2), a core shaft (3) and a pre-stress spring (4); the spring seat (2) is slidably connected to a base (1) via the core shaft (3); the core shaft (3) passes through a guide hole of the base (1); the pre-stress spring (4) is arranged in the base (1) and sleeved on the core shaft (3); one end of the rigging is fixedly connected to the spring seat (2), and the other end is pulled by a lifting device; the pre-stress spring (4) is deformed as the tension of the rigging changes, thereby driving the spring seat (2) to move along the core shaft (3); A sensor module is connected to the control unit and is used to detect the deformation of the preload spring (4) and output a corresponding electrical signal; the sensor module comprises: A first sensor (6) is used to detect a loosening threshold deformation signal of a preload spring (4) when the rigging is in a preloaded state; A second sensor (7) is used to detect a rope-breaking threshold deformation signal of the preload spring (4) when the rigging is in a rope-breaking failure state; The control unit can receive the electrical signal of the sensor module to control the operation of the lifting equipment. When receiving the signal of the first sensor (6), the control unit controls the rigging to stop the lowering action; when receiving the signal of the second sensor (7), the control unit controls the lifting equipment to stop and activates the mechanical brake device to prevent the load from falling.

2. A rigging anti-loosening and rope-breaking detection mechanism as claimed in claim 1, characterized in that: A sensing element (5) is tightly connected above the preload spring (4), and the deformation signal is a position signal of the sensing element (5).

3. A rigging anti-loosening and rope-breaking detection mechanism as claimed in claim 2, characterized in that: The induction component (5) is sleeved on the core shaft (3), the core shaft (3) is a screw, and a nut is sleeved on the top of the induction component (5).

4. A rigging anti-loosening and rope-breaking detection mechanism as claimed in claim 3, characterized in that: The sensor module is arranged on one side of the base (1) to detect the position signal of the sensing element (5).

5. A rigging anti-loosening and rope-breaking detection mechanism as claimed in claim 4, characterized in that: The sensor module includes a proximity switch, a mechanical micro switch, a photoelectric sensor or a displacement sensor.

6. A rigging anti-loosening and rope-breaking detection mechanism as claimed in claim 5, characterized in that: The control unit is also connected to an audible and visual alarm module, which synchronously triggers an audible and visual alarm signal when receiving a signal from the second sensor (7).

7. A rigging anti-loosening and rope-breaking detection mechanism according to any one of claims 1 to 6, characterized in that: The preload spring (4) is subjected to a coating anti-corrosion treatment.

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