This standard specifies the classification, technical requirements, test methods, inspection rules and markings of marine jib cranes. This standard applies to single-jib cranes driven by electric or hydraulic power for loading and unloading cargo, operating in port areas or offshore waters with wind force not greater than Beaufort 2. The crane has the ability to lift, lower, horizontally change the amplitude and rotate cargo. All functions can be achieved separately or in combination. This standard does not apply to electromagnetic and grab cranes, offshore platform cranes and other cranes. GB/T 12932-1991 Marine Jib Crane GB/T12932-1991 Standard download decompression password: www.bzxz.net

UIC 621.873.12:629.12
National Standard of the People's Republic of China
GB/T 12932—91
Shipbuilding-jib cranes
Issued on 1991-05-22
Implemented on 1992-02-01
Issued by the State Bureau of Technical Supervision
W.National Standard of the People's Republic of China
Shipbuilding-jib cranes
Shi pbuildtug jib ceanes
Subject content and applicable model drawings
GB/T 12932--91
This standard specifies the classification, technical requirements, test methods, inspection rules and markings of shipbuilding-jib cranes (hereinafter referred to as cranes).
This standard applies to single-jib cranes driven by electric or hydraulic forces for loading and unloading cargo, operating in ports or seas 1: Wind force is not greater than 2 degrees. The crane has the ability to lift, drop, horizontally luff and rotate cargo, and all functions can be realized separately or in combination. This standard does not apply to electromagnetic and grab cranes, offshore platform cranes and other cranes. 2 Reference standards
GB 3811 Crane design specification
GL3893 Ship board mechanical name and terminology
GB11637 Ship hydraulic jib crane T factory test method 3 Water language
In addition to the terms specified in GH 3893, this standard also uses the following terms 3.1 Luffing
Refers to the angular movement of the crane boom in the vertical plane. 3.2 Nominal size refers to the nominal maximum safe working load on the hook when the crane boom is at the maximum working radius. 3.3 Nominal hoisting speed refers to the average speed of the hook when the crane is using the hoisting mechanism to lift the maximum safe working load. 3.4 Nominal luffing time refers to the time required to change the boom from the maximum working radius to the minimum working radius when only the gear mechanism is used to lift the boom with the maximum safe working load. 3.5 Nominal slewing speed refers to the nominal slewing speed when the crane is using the gear mechanism to lift the boom with the maximum safe working load. Speed
refers to the net rotation speed maintained by the crane when the boom is rotating between the maximum working radius and the safe working load under the unfavorable conditions of the ship's heel 5 and pitch 2 at the same time. 4 Product classification
4.1 The crane is divided into two types: electric and hydraulic according to the power source. 4.2 The performance parameters of the crane are shown in Table 1.
Approved by the State Bureau of Technical Supervision on May 22, 1991 and implemented on February 1, 1992
W. Nominal specifications
Maximum safe working load. t
Nominal lifting speed is not less than +m/5
Nominal amplitude change time is not more than 10,5
Nominal slewing speed is not less than, 『mi
Minimum load speed, m45
Maximum controllable ground speed, m/s
GB/T 12932—1
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Note: 1) The luffing time refers to the time required for the frame to start luffing from the maximum working radius of 25m to the minimum working radius. 2; The performance of the single crane should be within the range given in Table 1. The exact value should be agreed upon by the manufacturer and the user. 4.3 Marking example:
Hydraulic jib crane nominal specification 12, lifting height 30m, minimum working radius 3㎡, maximum working half 20m marked as: jib crane Y1230×3×20GB/T12932—91 Technical requirements
5.1 General design requirements
5.1.1 The structural design of the crane should comply with GB 3811 Part 3, and should meet the relevant specifications of my country's Ship Inspection Bureau. 5.1.2 The design of the crane must meet the requirements of safe and effective operation when the ship is heeled 5 and tilted 2 at the same time. 5.2 Design of hoisting and luffing mechanism
5.2,1 The bottom diameter of the drum groove should not be less than 1 times the diameter of the wire rope. 5. 2.2 The length of the drum should be fully extended so that the wire rope is evenly wound on the drum, and shall not exceed the requirements of the second layer. When the boom or hook is at the lowest position, the drum should retain no less than 3 turns of wire rope. 5.2.3 For drums that do not use a rope pressure device, when the maximum working length of the wire rope is completely and evenly wound on the drum, the height between the drum flange and the outermost wire rope should be greater than 2.5 times the diameter of the wire rope. 5.2.4 The lifting mechanism should have measures to prevent the wire rope from loosening. 5.3 Copper wire rope
The wire rope must be compatible with the diameter of the drum and pulley, and its minimum breaking load should not be less than the maximum load on the wire rope multiplied by the safety factor. The safety factor is shown in Table 2.
W. Safe working load Sw.,t
GB/T 12932—91Www.bzxZ.net
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5.4 Braking system design
5.4.1 The crane should have an automatic braking system. When the control device is in the stop position, or when the crane loses power, the automatic braking system will work.
5.4.2 When the crane moves at the maximum design speed, the braking system should be able to effectively brake 1.5 times the safety load. When the slewing mechanism braking system is simultaneously acting at a 5° roll and 2° trim, the slewing braking torque is 1.25 times the crane slewing torque. 5.4.3 In the event of power loss, there must be measures to control the load descent and force the brake to release. 5.4.4 The braking system should not generate impact loads that cause damage to the structure and mechanism of the crane. 5.4.5 Mechanical brakes shall be equipped with brake pads made of refractory materials. Such pads shall not affect the normal operation of the brakes after being exposed to heat and moisture. 5.5 Control
5.5.1 Control method
The crane shall be directly controlled by human operation. Remote control may also be provided when necessary. The lifting, lowering, luffing and slewing controls shall have variable operating speeds.
5.5.2 Power source
The power source of the crane may be provided by electricity or hydraulics. 5.5.3 Control device
5.5.3.1 The operating handle shall be pulled from the middle stop position to the operator, that is, the lifting mechanism is upward, the lifting or luffing mechanism is in the direction of inward luffing. Conversely, that is, the direction of lowering or outward luffing, the operating handle is moved to the left, and the crane shall slew to the left. On the contrary, the crane turns right. For the control device using the foot pedal, when the foot pedal is pressed, the hoisting mechanism is lowered or the luffing mechanism is luffed outward. On the contrary, when the foot pedal is lifted: the hoisting mechanism is raised or the luffing mechanism is luffed inward. 5.5.3.2 Regardless of the form of power used, the control device should be able to automatically return to the stop position. After the power is lost, all the control devices must be returned to the stop position before the crane can be started again. 5.5.3.3 All control devices must be clearly and permanently marked with their purpose and operation method. 5.5.4 Emergency stop
The crane must have a fast-acting emergency stop mechanism that can cut off the power source of the crane and enable the automatic control brake system when the operator performs an emergency stop. The emergency stop mechanism should be placed in a position that is obvious, easy for the operator to access, and can avoid accidental operation.
5.6 Horizontal luffing
The design of the boom and luffing mechanism should make the boom make the goods move approximately horizontally when the safe working load is lifted and the luffing is changed from the maximum working amplitude to the minimum working amplitude.
Note: When in special circumstances, no displacement or horizontal movement of the goods is required, this is the result of consultation between the manufacturer and the user. 5.7 Limit switch
The limit switch or similar device should be able to prevent the crane from overtravel under any operation method. The limit switch can also be reset to limit the range of movement of the crane to avoid certain temporary or fixed obstacles. W.5.8 Passage
GB/T 12932--91
The passage leading to the control room and control parts should have safety facilities. 5.9 Lubrication
The crane should be designed to ensure operation under the conditions of 5° heel and 2° step heel at the same time, and should have effective lubrication. 5.10 Electrical equipment
Electrical equipment shall comply with the relevant requirements of Part III of the Ship Inspection Bureau's "Rules for Classification and Construction of Seagoing Steel Ships". The external light protection level of electrical equipment installed on open decks shall not be lower than IP66, and the shell protection level of portable electrical equipment on deck shall not be lower than IP33
5,11 Overload protection
The crane should be equipped with an overload protection device. The overload protection device should be adjusted to operate within the range of 110% safe working load and can send out sound or light signals at the same time:
6 Test method
The factory test method of marine hydraulic jib crane shall be carried out in accordance with GR11637. The test method of marine electric jib crane 1" shall be determined by the manufacturer and the ordering party through consultation and meet the relevant specifications of the Ship Inspection Bureau. Inspection rules
The inspection test is generally carried out during manufacturing. The ordering party and the Ship Inspection Bureau representative should participate in the test. The inspection test results should be recorded in the manufacturer's test certificate. 1.2 Factory inspection
Each crane shall be inspected at the factory when it is delivered. The inspection of marine wave-layer jib crane shall be carried out in accordance with the requirements of Chapter 3 of GB 11637. 7.3 Type inspection
Each batch of cranes of each nominal specification must be inspected for type inspection. The type inspection of marine jib cranes shall be carried out in accordance with the requirements of Chapter 4 of GB11637. 8 Markings
The crane shall be equipped with a nameplate as an obvious and permanent mark. The nameplate shall include the following: manufacturer name, factory number and factory date;
Safety! Working load,
Minimum and maximum working radius, n;
Product name, model and ship inspection mark.
Additional remarks:
This standard is proposed by China Shipbuilding Industry Corporation. This standard is under the jurisdiction of the Deck Machinery Sub-Technical Committee of the National Technical Committee for Standardization of Marine Machinery. This standard was drafted by the 704th Institute of China Shipbuilding Industry Corporation. The main author of this standard is Chen Junsong
W.
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