Protection system suitable for free face of crane

Abstract

The utility model discloses a protection system suitable for a free face of a crane, which relates to the technical field of metal structure hoists of hydropower stations and comprises a metal protection net retracting and releasing mechanism arranged on the free face. The metal protective net retracting and releasing mechanism comprises a first protective net retracting and releasing unit and a second protective net retracting and releasing unit which are symmetrically arranged on the two sides of the hoisting trolley mechanism and are in linkage with the hoisting trolley mechanism, and the first protective net retracting and releasing unit and the second protective net retracting and releasing unit are in a tensioned state; and one ends of the first protective net retracting and releasing unit and the second protective net retracting and releasing unit are fixed at the end parts of the two crane main beams, and the other ends are hung on the hoisting trolley mechanism. The free face protection system is linked with a hoisting trolley mechanism, the free face protection system releases and shrinks the metal protection net by taking the operation data of the hoisting trolley mechanism of the crane as reference, so that the metal protection net is always in a tensioning state, the free face protection system is formed, the normal operation of the crane is not influenced, and the safety of workers is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of water and electricity station metal structure opening and closing machine, more particularly to the technical field of protection system suitable for crane free surface. BACKGROUND

[0002] The crane is used for hoisting operation of heavy objects, and the trolley running mechanism track is arranged on the crane girder, so that the track side is a passing area for operating personnel, and the other side is a free surface.

[0003] The current protection measures are generally arranging safety lines near the crane girder, and the operating personnel wear safety belts and hang the safety belts on the safety ropes for temporary protection when passing.

[0004] When the crane equipment is overhauled, a large amount of overhaul materials are stacked on the crane girder, and if the materials are placed unreasonably and the overhaul personnel are mis-collided, high-altitude falling objects are easily caused, and there is a certain safety risk. CONTENT OF THE UTILITY MODEL

[0005] The utility model discloses a protection system suitable for the free surface of a crane.

[0006] The utility model discloses a protection system suitable for the free surface of a crane.

[0007] The utility model provides a protection system suitable for the free surface of a crane, and the crane comprises two crane girders, a hoisting trolley mechanism slidingly arranged between the two crane girders, and a free surface formed between the two crane girders, the protection system comprises a metal protection net winding and unwinding mechanism arranged on the free surface, the metal protection net winding and unwinding mechanism comprises a first protection net winding and unwinding unit and a second protection net winding and unwinding unit which are symmetrically arranged at the two sides of the hoisting trolley mechanism and are linked with the hoisting trolley mechanism, and the first protection net winding and unwinding unit and the second protection net winding and unwinding unit are in a tension state.

[0008] Specifically, the scheme sets a metal protective net between the free surfaces between the main beams of the crane, establishes a free surface protection system, the control system of which is linked with the lifting trolley mechanism, and uses the operation data of the lifting trolley mechanism of the crane as a reference to release and shrink the metal protective net of the free surface protection system, so that the metal protective net is always in a tension state, forming a free surface protection system, and does not affect the normal operation of the crane, ensuring the safety of the personnel passing through the main beams of the crane.

[0009] In one embodiment, the first protective net winding and unwinding unit and the second protective net winding and unwinding unit are of the same structure.

[0010] In one embodiment, the first protective net winding and unwinding unit and the second protective net winding and unwinding unit each include a storage reel, a protective net, and a reel motor, the storage reel is installed between the ends of the two main beams of the crane, the width of the protective net is adapted to the width of the free surface, the fixed end of the protective net is wound on the storage reel assembly, and the moving end of the protective net is hung on the lifting trolley mechanism.

[0011] In one embodiment, the lifting trolley mechanism is provided with a hooking and unhooking device at both ends of the bottom, and one end of the protective net is connected with the hooking and unhooking device.

[0012] Specifically, the hooking and unhooking device for the protective net is provided at the bottom of the lifting trolley mechanism, which facilitates the quick connection of the protective net with the lifting trolley mechanism; when the free surface protection system fails or needs to be taken out of operation, the hooking and unhooking device can be operated to quickly disconnect the protective net from the lifting trolley mechanism.

[0013] In one embodiment, the front section of the metal protective net and the bottom of the lifting trolley mechanism are each provided with a position detection device for real-time monitoring of the synchronization of the metal protective net and the lifting trolley mechanism, and each position detection device is electrically connected with the PLC controller of the crane.

[0014] Specifically, the position detection device is a speed synchronization monitoring module, which is installed at the front end of the metal protective net and the bottom of the lifting trolley mechanism, and is used to real-time monitor the synchronization of the metal protective net and the lifting trolley mechanism.

[0015] In one embodiment, the hooking and unhooking device includes an operating rod, a net hook arranged at equal intervals on the operating rod, and a fixed base arranged at both ends of the operating rod, the two fixed bases are fixed on the base of the lifting trolley mechanism, and the position detection device is arranged on one of the fixed bases.

[0016] In one embodiment, one end of the storage reel is connected with the output shaft of the reel motor through a connecting shaft, and the reel motor is electrically connected with the PLC controller of the crane.

[0017] Specifically, the metal protective net is wound on a storage reel, and the other end is connected with a metal protective hooking / detaching device at the bottom of a lifting trolley mechanism; the storage reel is connected with a three-in-one motor through a connecting shaft; the three-in-one motor is controlled to rotate by a crane PLC controller, so as to realize the releasing and shrinking of the metal protective net.

[0018] In one embodiment, the protective net is a metal protective net.

[0019] In one embodiment, the metal protective net is made of metal net wires crisscrossed.

[0020] In one embodiment, the output end of the reel motor is connected with the connecting shaft at one end of the storage reel through a speed changer and a torque limiter. 。

[0021] The beneficial effects of the utility model are as follows:

[0022] 1. The utility model discloses a metal protective net arranged on the free surface between the main beams of the crane, and establishes a free surface protection system.

[0023] 2. The utility model discloses a simple structure, mature technology and simple manufacturing and installation.

[0024] 3. The method can realize the protection of the free surface of the crane and essentially solve the safety risks of high-altitude falling and high-altitude falling objects when personnel pass and materials are stacked on the crane.

[0025] 4. The method has strong universality and can be popularized to all hoisting equipment requiring free surface protection, and has wide application prospects. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as the limitation to the scope, and for the ordinary skilled in the art, other related drawings can also be obtained without the creative labor on the premise of the drawings.

[0027] Figure 1 It is a structure schematic view of a free surface protection system suitable for the crane of the utility model.

[0028] Figure 2 It is a front view of Figure 1 the utility model.

[0029] Figure 3 is a hardware connection diagram of the crane air face protection system.

[0030] Figure 4 is a trolley mechanism advancing process, and the automatic deviation correction program flow of the air face protection system.

[0031] Figure 5 is a trolley mechanism retreating process, and the automatic deviation correction program flow of the air face protection system. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and technical effects of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the detailed description of the embodiments of the present application provided in the drawings below is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0034] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the embodiments of the present application, it should be noted that the directions or position relationships indicated by the terms "inner", "outer", "upper", etc. are based on the directions or position relationships shown in the drawings, or the directions or position relationships commonly placed when the product of the present application is used, which are only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular direction, be constructed and operated in a particular direction, therefore, cannot be understood as a limitation on the present application.

[0036] Example 1

[0037] As Figures 1 to 3As shown, this embodiment provides a protective system for the free-face of a crane. The crane includes two main crane beams and a trolley mechanism slidably disposed between the two main crane beams, forming a free-face between the two main crane beams. The protective system includes a metal protective net retraction mechanism disposed on the free-face. The metal protective net retraction mechanism includes a first protective net retraction unit and a second protective net retraction unit symmetrically disposed on both sides of the trolley mechanism and linked with the trolley mechanism. The first and second protective net retraction units are in a tensioned state. One end of the first and second protective net retraction units is fixed to the end of the two main crane beams, and the other end is hooked onto the trolley mechanism.

[0038] Specifically, this solution involves installing a metal protective net on the free surface between the main beams of the crane to establish a free surface protection system. The control system is linked with the crane trolley mechanism. Using the crane trolley mechanism's operating data as a reference, the free surface protection system releases and contracts the metal protective net, ensuring that the metal protective net is always taut, thus forming a free surface protection system without affecting the normal operation of the crane and ensuring the safety of personnel passing through the main beams of the crane.

[0039] Example 2

[0040] like Figures 1 to 2 As shown, this embodiment provides a protective system for the free-face of a crane. The crane includes two main crane beams and a trolley mechanism slidably disposed between the two main crane beams, forming a free-face between the two main crane beams. The protective system includes a metal protective net retraction mechanism disposed on the free-face. The metal protective net retraction mechanism includes a first protective net retraction unit and a second protective net retraction unit symmetrically disposed on both sides of the trolley mechanism and linked with the trolley mechanism. The first and second protective net retraction units are in a tensioned state. One end of the first and second protective net retraction units is fixed to the end of the two main crane beams, and the other end is hooked onto the trolley mechanism.

[0041] The first and second protective net deployment units have the same structure.

[0042] Both the first and second protective net retraction units include a storage drum, a protective net, and a drum motor. The storage drum is installed between the ends of the two crane main beams. The width of the protective net is adapted to the width of the open surface. The fixed end of the protective net is wound around the storage drum assembly, and the moving end of the protective net is attached to the lifting trolley mechanism.

[0043] Example 3

[0044] This embodiment is a further optimization based on embodiment 2, specifically:

[0045] The lifting trolley mechanism is provided with a hooking and unhooking device at both ends of the bottom, and one end of the protective net is connected with the hooking and unhooking device.

[0046] Specifically, the hooking and unhooking device for the protective net is arranged at the bottom of the lifting trolley mechanism, so as to facilitate the quick connection of the protective net with the lifting trolley mechanism; when the free surface protection system fails or needs to be withdrawn from operation, the hooking and unhooking device can be operated to quickly separate the protective net from the lifting trolley mechanism.

[0047] Embodiment 4

[0048] This embodiment is further optimized on the basis of Embodiment 3, specifically:

[0049] The front section of the metal protective net and the bottom of the lifting trolley mechanism are both provided with position detection devices for real-time monitoring of the synchronization of the metal protective net and the lifting trolley mechanism, and each position detection device is electrically connected with the crane PLC controller.

[0050] Specifically, the position detection device is a speed synchronization monitoring module, and the position detection device is installed at a suitable position of the front end of the metal protective net and the bottom of the lifting trolley mechanism to real-time monitor the synchronization of the metal protective net and the lifting trolley mechanism.

[0051] Embodiment 5

[0052] This embodiment is further optimized on the basis of Embodiment 3, specifically:

[0053] The hooking and unhooking device includes an operating rod, a net hook arranged at equal intervals on the operating rod, and a fixed base arranged at both ends of the operating rod, the two fixed bases are fixed on the base of the lifting trolley mechanism, and the position detection device is arranged on one of the fixed bases.

[0054] One end of the storage reel is connected with the output shaft of the reel motor through a connecting shaft, and the reel motor is electrically connected with the crane PLC controller.

[0055] Specifically, the metal protective net is wound on the storage reel, and the other end is connected with the metal protective hooking and unhooking device at the bottom of the lifting trolley mechanism, the storage reel is connected with the three-in-one motor through the connecting shaft, the crane PLC controller controls the rotation of the three-in-one motor, and the release and contraction of the metal protective net are realized.

[0056] The protective net is a metal protective net, which is made of longitudinal and transverse metal mesh wires. The output end of the reel motor is connected with the connecting shaft at one end of the storage reel through a speed changer and a torque limiter.

[0057] Embodiment 6

[0058] The embodiment provides a control process of a protection system suitable for an air face of a crane, as follows:

[0059] S1, determining the operation speed of the air face protection system based on operation parameters of a lifting trolley mechanism:

[0060] According to the motor rotating speed of the lifting trolley mechanism and the speed reduction ratio of a speed reducer, the rotating speed of a storage drum of the air face protection system is calculated, that is, the releasing and shrinking speed of the metal protection net.

[0061] Supposing that the rated rotating speed of the operation motor of the lifting trolley mechanism is n1, the speed reduction ratio of the speed reducer is i1, the wheel diameter of the lifting trolley mechanism is D1, and there is no pulley set, so the pulley set ratio is m1=1, then the rated operation speed of the lifting trolley mechanism is v1=(π*D1*n1) / (i1*m1).

[0062] Supposing that the rated rotating speed of the three-in-one motor of the air face protection system is n2, the speed reduction ratio of the speed reducer is i2, the drum diameter is D2, and there is no pulley set, so the pulley set ratio is m2=1, then the rated rotating speed of the drum of the air face protection system is v2=(π*D2*n2) / (i2*m2).

[0063] According to the proportional relationship between v1 and v2, the speed values of each gear of the motor of the air face protection system are calculated in sequence by taking the speed values of each gear of the motor of the lifting trolley mechanism as reference.

[0064] S3, correcting the operation speed of the air face protection system:

[0065] The position detection switch is installed at a proper position at the front end of the metal protection net and the bottom of the lifting trolley mechanism, so as to monitor the synchronization of the metal protection net and the lifting trolley mechanism in real time, and the operation speed of the air face protection system is adjusted in time according to the monitored data.

[0066] For example, Figure 4As shown, during the forward movement of the trolley mechanism, the crane PLC controller reads the deviation value d of the position detection switch in real time. If d is positive and d1 < d < d2 (based on the zero point of the position detection switch, d1 is the set maximum allowable deviation distance value, which can be adjusted appropriately according to actual needs; d2 is the limit value of the position detection switch), the metal protective net release speed increases by 20% (which can be adjusted appropriately according to needs); if d is negative and -d2 < d < -d1 (based on the zero point of the position detection switch, d1 is the set maximum allowable deviation distance value, which can be adjusted appropriately according to actual needs; d2 is the limit value of the position detection switch), the metal protective net release speed decreases by 20% (which can be adjusted appropriately according to needs); within a specified time t, if -d1 ≤ d ≤ d1 (based on the lower limit, d is a certain distance value, which can be adjusted appropriately according to actual needs), the drum rotation returns to normal speed; otherwise, the PLC issues an alarm command.

[0067] like Figure 5 As shown, during the retraction of the trolley mechanism, the crane PLC controller reads the deviation value d of the position detection switch in real time. If d is negative and -d2 < d < -d1 (based on the zero point of the position detection switch, d1 is a certain distance value, which can be adjusted appropriately according to actual needs; d2 is the limit value of the position detection switch), the retraction speed of the metal protective net increases by 20% (which can be adjusted appropriately according to needs). If d is positive and d1 < d < d2 (based on the zero point of the position detection switch, d1 is a certain distance value, which can be adjusted appropriately according to actual needs; d2 is the limit value of the position detection switch), the retraction speed of the metal protective net decreases by 20% (which can be adjusted appropriately according to needs). Within a specified time t, if -d1 ≤ d ≤ d1 (based on the lower limit, d is a certain distance value, which can be adjusted appropriately according to actual needs), the drum rotation returns to normal speed; otherwise, the crane PLC controller issues an alarm command.

Claims

1. A protection system for the free face of a crane, the crane comprising two crane girders, a hoisting trolley mechanism slidingly arranged between the two crane girders, a free face being formed between the two crane girders, characterized in that The protection system comprises a metal protection net winding and unwinding mechanism arranged on the free surface, the metal protection net winding and unwinding mechanism comprises a first protection net winding and unwinding unit and a second protection net winding and unwinding unit symmetrically arranged on both sides of the lifting trolley mechanism and linked with the lifting trolley mechanism, the first protection net winding and unwinding unit and the second protection net winding and unwinding unit are in a tension state; one end of the first protection net winding and unwinding unit and the second protection net winding and unwinding unit is fixed on the end of the two crane main beams, and the other end is hung on the lifting trolley mechanism.

2. A guard system for the airside face of a crane according to claim 1, characterized in that The first protection net winding and unwinding unit and the second protection net winding and unwinding unit are the same in structure.

3. A guard system for the airside face of a crane according to claim 2, characterized in that The first protection net winding and unwinding unit and the second protection net winding and unwinding unit each comprises a storage winding drum, a protection net and a winding drum motor, the storage winding drum is installed between the ends of the two crane main beams, the width of the protection net is matched with the width of the free surface, the fixed end of the protection net is wound on the storage winding drum assembly, and the moving end of the protection net is hung on the lifting trolley mechanism.

4. A guard system for the airside face of a crane according to claim 3, characterised in that, The lifting trolley mechanism is provided with a hooking and unhooking device at both ends of the bottom, and one end of the protection net is connected with the hooking and unhooking device.

5. A guard system for the airside face of a crane according to claim 4, characterized in that The front section of the metal protection net and the bottom of the lifting trolley mechanism are each provided with a position detection device for monitoring the synchronization of the metal protection net and the lifting trolley mechanism in real time, and each position detection device is electrically connected with the crane PLC controller.

6. A guard system for the airside face of a crane according to claim 5, characterized in that The hooking and unhooking device comprises an operating rod, a net hook arranged at equal intervals on the operating rod, and a fixed base arranged at both ends of the operating rod, the two fixed bases are fixed on the base of the lifting trolley mechanism, and the position detection device is arranged on one of the fixed bases.

7. A guard system for the airside face of a crane according to claim 3, characterized in that One end of the storage winding drum is connected with the output shaft of the winding drum motor through a connecting shaft, and the winding drum motor is electrically connected with the crane PLC controller.

8. A guard system for the airside face of a crane according to claim 3, characterized in that The protection net is a metal protection net.

9. A guard system for the airside face of a crane according to claim 8, characterized in that The metal protection net is made of longitudinal and transverse intersecting metal mesh wires.

10. A guard system for the airside face of a crane according to claim 9, characterized in that The output end of the winding drum motor is connected with the connecting shaft at one end of the storage winding drum through a transmission and a torque limiter.

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