CN111017775A - Portable crane suitable for mounting of bench type equipment and operation method thereof - Google Patents

Abstract

The invention relates to a portable crane suitable for mounting a rack-type device and an operation method thereof. The operation method of the invention assembles the cross arm, the inclined arm and the pulley in a vertical arm inserting mode. The invention can lead constructors to hoist equipment in different places and different terrain environments in a time-saving, labor-saving and labor-saving way. The device has the characteristics of simple structure, low cost, portability, convenient installation, small occupied area, simple installation and disassembly and convenient use.

Description

Portable crane suitable for mounting of bench type equipment and operation method thereof

Technical Field

The invention relates to a portable crane, in particular to a portable crane suitable for installing a rack type device and an operation method thereof.

Background

Rack-mounted devices, such as outdoor main transformers, vacuum switches, load switches, disconnectors, drops, insulators, etc., are very common in distribution lines. The weight of the platform-based equipment such as a main transformer is generally heavier, the average in-place height of the equipment is about 10 meters, and the equipment is overhauled and replaced for many times in the whole life cycle.

At present, partial equipment adopts a method of manually lifting and hanging an inclined platform, but the personal safety of lifting and hanging operators is often threatened and is slightly and carelessly crushed by heavy objects. In addition, because the equipment on the inclined table is easy to lose stability and is difficult to control by manpower, the equipment is also often damaged by accidental collision; the conventional hoisting machinery is adopted, and firstly, the requirement on the environment of a construction area is harsh. Especially, in coastal areas, shrimp ponds, salt ponds and ponds are distributed more. In order to meet the requirements of conventional hoisting machinery on approach roads and developed terrains, a construction unit has to adopt a large amount of soil laying construction operation. The increased earth volume and labor cost are not small numbers. Secondly, the expense of the renting machine class of the hoisting machinery is high, but the resource waste is obvious. Only simple rack type equipment installation operation is taken as an example, the rated lifting tonnage of the automobile crane on the market is generally dozens of tons or even hundreds of tons, and the average platform shift cost of the crane is 1000 yuan/day. The weight of the platform-based transformer is generally about 0.16 to 0.8 ton, so that the typical 'chicken killing knife' is the rented conventional large truck crane.

The method for manually lifting and hanging the leaning platform by adopting the manual leaning and the conventional hoisting machinery hoisting equipment have limitations, and the portable hoisting equipment suitable for installing the rack type equipment is urgently needed, the rated hoisting capacity of the equipment is adapted to the weight of the rack type equipment, the equipment is suitable for various unconventional terrains, the equipment is light in volume, convenient to operate and relatively low in cost, and the hoisting operation is safe and reliable.

Disclosure of Invention

In view of the above problems, the present invention provides a portable crane suitable for installation of a platform-based device, the portable crane includes a bushing and hoop unit, a tripod and pulley unit, a winch and hoop unit and a power unit, wherein the bushing and hoop unit includes a hollow bushing and at least two hoops fixed together, the hollow bushing is fixed on the top or upper part of an electric pole through the at least two hoops to fix the tripod and the pulley unit on the upper part of the electric pole; the tripod and pulley unit comprises a cross arm, a vertical arm, an inclined arm and at least two pulleys arranged at two sides above the cross arm, the vertical arm and the inclined arm form a right-angled triangle support, the diameter of the vertical arm is smaller than that of the hollow sleeve, and the vertical arm is used for being inserted in the hollow sleeve; the hoisting machine and hoop unit comprises a hoisting machine, at least one hoop and a steel wire rope, the hoisting machine is fixed at the root or the lower part of the electric pole through the at least one hoop, one end of the steel wire rope is connected with the hoisting machine, and the other end of the steel wire rope is provided with a hook and is hung down through at least two pulleys on two sides above the cross arm so as to slide the lifting platform type equipment; the power unit includes a generator for driving the hoist to lift the rack-type device.

In one embodiment, the portable crane further comprises a controller unit connected to the hoist to effect electrical control of the lifting of the device.

In one embodiment, the hoist may be an electric block that may be secured to the lower portion of the pole or above the tripod cross arm by a hoop.

In one embodiment, the hollow sleeve is made of circular stainless steel and is welded with the outer sides of the at least two hoops, the triangular frame is made of stainless steel solid materials and is welded into a stable triangular structure, the pulley is welded on the cross arm according to the selected size of the triangular frame, and the winch is welded with the at least one hoop.

In one embodiment, the hollow cannula has a length of at least 40cm and a diameter of at least 8 cm.

In one embodiment, the vertical arms are made of stainless steel and are not more than 40cm in length, the transverse arms are made of ferrous materials and are 1.2m in length, and the inclined arms are made of ferrous materials.

In one embodiment, the size of the hoop is selected according to the model of the electric pole, and the U-shaped hoop adopts No. 45 steel diameter M27 high-strength bolts to reduce the number of the bolts.

In one embodiment, the steel cord is an intertwined, intertwined steel core steel cord.

In one embodiment, the generator is a SHW190 electric welding generator, and gasoline is used as a raw material.

An operation method of a portable crane suitable for mounting a rack-type device, the operation method being applied to the portable crane suitable for mounting the rack-type device, the operation method comprising:

s1, fixing the winch and the hoop unit at the pole root position through a hoop;

s2, an operator firstly climbs the tower, the sleeve and two hoops of the hoop unit are installed by adopting a rope hanging method, the hoops are ensured to be in a horizontal position, and the extended ends of the hoops are positioned on the opposite surfaces of equipment to be installed;

s3, assembling the cross arm, the inclined arm and the pulley in a vertical arm splicing mode;

s4, lifting the steel wire rope to the upper side through the insulating rope in advance, placing the lifting hook to a specified position after passing through the two pulley blocks on the upper triangular frame, and fastening the safety buckle on the pulley block to prevent the steel wire rope from falling off;

and S5, lifting the equipment to be installed to a proper position through a winch by an operator to complete installation.

The invention can lead constructors to hoist equipment in different places and different terrain environments in a time-saving, labor-saving and labor-saving way. The device has the characteristics of simple structure, low cost, portability, convenient installation, small occupied area, simple installation and disassembly and convenient use.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a tripod diagram;

FIG. 3 is a tripod acceptance vector diagram;

wherein: the cable pulling device comprises a cross arm 1, a vertical arm 2, an inclined arm 3, a hollow sleeve 4, a first cable pulling hoop 5, a second cable pulling hoop 6, a bolt 7, a pulley 8, a pulley 9, a winch 10, a steel wire rope 11, a hook 12, a hoop 13, a generator 14 and a controller 15.

Detailed Description

As shown in figure 1, a cross arm 1, a vertical arm 2 and an inclined arm 3 are welded into a whole, 2 pulleys 8 and 9 are arranged on the cross arm 1, hollow sleeves 4 are arranged on hoops 5 and 6 to be connected, and the sleeves 4 are connected with the vertical arm 2 in a plugging mode, so that the cross arm, the vertical arm, the inclined arm and the hoops can be conveniently detached without occupying space. The pulleys comprise a first fixed pulley 8 and a second fixed pulley 9 which are respectively arranged at two ends of the cross rod, and the pull rope passes through the first fixed pulley and the second fixed pulley and is wound on the winch 10; in the installation process, an operator firstly climbs the tower, two hoops are installed by adopting a rope hoisting method, and the transverse arm, the inclined arm and the pulley are assembled in a vertical arm inserting mode. When constructors hoist equipment, can operate the hoist engine device and through assembly pulley and couple 12 light hoisting weight great equipment (isolator, fall, insulator etc.), and can use the device in different places, different topography environment, device simple structure, low cost, portable and installation, save time more, laborsaving, save labour when letting constructors hoist equipment. The portable crane is easy to carry and is not limited by space; the plug-in type combination is adopted, so that the disassembly and the assembly are easier; the safety factor is high; 2 pulleys are adopted, so that the reliability is higher, and the manufacture is simple; the hoisting device is suitable for hoisting objects with weight of about 800kg, and can meet the hoisting requirement of 10kV distribution network equipment.

According to the functional requirements and the basic structure of the portable crane, the portable crane is designed into five parts, namely a sleeve and hoop unit, a tripod and pulley unit, a winch and hoop unit, a controller unit and a small generator unit.

The sleeve and hoop unit and the tripod and pulley unit are main body parts bearing equipment tension and core parts, and have the main functions of fixing a vertical arm of the tripod through the sleeve and then realizing sliding lifting of the steel wire rope 11 through two pulleys on the tripod; the hoop 13, the winch and the steel wire rope unit are power equipment for realizing the lifting of the equipment; the controller unit realizes electric control of equipment lifting; the small generator 14 provides power for the winch, so that equipment lifting is realized.

Staple bolt selection mode, to the staple bolt in bushing unit, its sleeve pipe main function realizes that the tripod erects the arm and inserts to satisfy the atress requirement, to the staple bolt function be fixed sleeve pipe on the pole, prevent the lapse, guarantee the safety and stability of lifting by crane the process, so choose phi 210's stainless steel staple bolt for use according to the length of pole. We first selected the material of the body of the cannula and determined it. According to tests, although the aluminum alloy material can meet the technical requirements under normal conditions, if the weight of equipment is increased, the bearing of the sleeve is increased, and the aluminum material is deformed; the 45 steel and the stainless steel material can bear larger load, the cost is not very high, the team member analyzes the corrosion resistance and the rusting condition of the 45 steel and the stainless steel, the stainless steel is not easy to corrode and rust, but the 45 steel is easy to corrode and rust, and the team member decides to select the sleeve made of the stainless steel material as shown in the table 1.

Meanwhile, the team member analyzes and researches the length of the sleeve, according to the mechanical principle, under the condition that the moment M is F L (F is the pulling force applied to the sleeve, and L is the length of the sleeve), the longer the L is, the smaller the pulling force applied to the sleeve is, and meanwhile, for the convenience of transportation, the larger the diameter of the sleeve is, the larger the stress area is, so that the applied pulling force is weakened, the length of the sleeve is at least 40cm according to calculation, and the diameter is more than or equal to 8cm, so that the relevant requirements are met.

When designing the structure of the sleeve, the team member decides to use a stainless steel hoop with the diameter of 210 and a sleeve (the length is more than or equal to 40cm) made of stainless steel material to be welded into a whole.

TABLE 1

The tripod and the pulley unit are used as a main supporting mechanism and mainly comprise a cross arm, a vertical arm, an inclined strut and a pulley. The triangle has the characteristics of stability, firmness and pressure resistance, when the lengths of three sides of the triangle are determined, the area and the shape of the triangle are completely determined, and the character is called the stability of the triangle. We therefore chose a tripod as the support structure. According to the selection of the material of the casing, the vertical arm of the tripod is also made of stainless steel, and the diameter of the vertical arm is smaller than that of the casing and is spliced with the casing. The cross arm and the inclined strut are not very large because of the tensile force, as shown in figures 2 and 3.

Assuming that the hoisting weight is 500kg, g is 10N/kg, the gravity in the hoisting direction is F500 x 10 x 5kN, the actual tripod angle is 45 degrees, the resultant force in the angle steel supporting direction is about 7kN, and the limit value of the bearing capacity of the L63 x 6 angle steel is 121.2kN which is far more than the calculated value according to the calculation table of the bearing capacity of the single-limb angle steel, so that the material selection scheme is reasonable.

The tripod cross arm and the inclined strut basically bear smaller pulling force, the cross arm and the inclined strut only need to meet the requirement of stabilizing the structure of the tripod, in order to reduce cost, the cross arm and the inclined strut are made of iron materials on the premise of meeting safety and stability, the length of the cross arm is 1.5 m, and the fixed pulleys cannot change the force but can change the direction of the force, so that the fixed pulleys with the diameter phi 20 are adopted.

By combining the analysis, the vertical arm is made of stainless steel (the length is less than or equal to 40cm), the transverse arm is made of iron (the length is 1.2 m), the inclined strut is a triangular frame made of iron, and the pulleys are welded at two ends of the transverse arm.

The electric hoist is a manual hoisting machine which is simple to use and convenient to carry, and is also called a chain hoist or a chain block. The lifting device is suitable for short-distance lifting of small equipment and goods, and the lifting capacity is generally not more than 100T. The shell of the chain block is made of high-quality alloy steel, and is firm, wear-resistant and high in safety performance. The electric hoist is used as an upgraded fixed pulley, completely inherits the advantages of the fixed pulley, and the requirement can be met by selecting the PA800 miniature electric hoist with lower cost according to the condition that the weight of a transformer for hoisting 400kVA at ordinary times is about 1400 kg.

The U-shaped hoop is a component which is made of one material and used for holding or hooping another material. It belongs to the fastener, because its special shape wide application in fields such as pole. The structural form of the product attribute U-shaped hoop relates to the structural form of the hoop body and the arrangement of bolts on the connecting plate. For the structural style of U type staple bolt, for reducing the bolt number, can adopt the material to be 45 # steel, diameter M27 high strength bolt, select phi 280 stainless steel staple bolt according to the pole model.

The diameter of the steel wire rope can be pressed by the maximum working static pressure of the steel wire rope

And determining, wherein d is the minimum diameter mm of the steel wire rope, c is the selection coefficient mm/N1/2, and s is the maximum working static pressure of the steel wire rope. According to the maximum value of 2.5t of the hoisting and the safety margin of 1.2, the maximum working static pressure of the steel wire rope is obtained

Selecting coefficient, selecting c to be 0.093 according to related standards of the steel wire rope and mechanism requirements, and knowing the minimum diameter of the steel wire rope

And selecting the steel wire rope with the model number of 6 multiplied by 7+ FC according to the calculation and the steel wire rope standard.

According to the practical needs of hoisting and hoisting operation, the following principles can be considered for the selection of the steel wire rope in general, as shown in table 2.

TABLE 2

In addition, the steel wire ropes twisted in the same direction have smooth and soft surfaces, good bending fatigue resistance and durability; the hoisting method has the disadvantages that strands at the broken part of the rope end are easy to loosen, and are easy to rotate and curl when heavy objects are suspended, so that the strands are not suitable for being independently adopted in hoisting, and the hoisting operation is usually carried out by winding and mutually twisting steel wire ropes, so that the group members decide to adopt the winding and mutually twisting steel core steel wire ropes with the diameters of 4 mm and 6X19 (b).

According to the functions to be realized by the control device, a manual control device and an automatic control device are selected, and analysis and comparison are carried out. Manual control: ground workers manually operate the pulley steel ropes to control the heavy objects to lift; the advantages are that: the price is low, the device is visual, the operation is convenient, and the operation is convenient for operators to master; the disadvantages are as follows: when the hoisting equipment is heavy, the workload is large, the operation efficiency is influenced, and safety risks can exist. Automatic control: the controller 15 is adopted to operate the electric hoist and control the lifting of the heavy object; the advantages are that: the workload is small, the operation is easy, the labor is saved, and the operation efficiency is high; the disadvantages are as follows: external power supplies are needed, increasing costs.

For a small generator, the main function is to provide power for a winch, so that the hoisting equipment is hoisted and installed. Meanwhile, the generator is matched according to the power of the winch. The generator is selected, primarily based on the load. The rated voltage and frequency of the generator are determined according to the voltage (380V, 220V or 440V) and the frequency (direct current, 50 or 60Hz) of the load. And secondly, determining the rated power of the generator according to the total power of the load. Besides considering that the total load power occupies 80% of the rated power of the generator, the load power which may be increased in the near future is also considered, and a certain margin is left, as shown in table 3.

TABLE 3

Generator feedstock selection comparison, as shown in table 4.

TABLE 4

The specific design is shown in table 5.

TABLE 5

Implementing one step: manufacturing hoop and sleeve unit

1. Purchasing a stainless steel pipe (with the length of 1 meter) and a hoop according to the requirements of design drawings

Stainless steel pipes and phi 210 hoops are purchased in the market of building materials in commercial and trade areas in Shandong province, Shandong province and City. According to the requirement of a countermeasure formulation table and a drawing, one stainless steel pipe with the diameter of 10cm and the length of 1m is purchased, 1 stainless steel pipe with the diameter of 8cm and the length of 1m is purchased, and the total cost is 480 yuan.

2. Cutting the stainless steel pipe according to the size of the design drawing

And cutting the stainless steel pipe according to the size requirement, wherein the length of the cut stainless steel pipe is 40cm, the diameter of the cut stainless steel pipe is 10cm, and the design requirement is met. Meanwhile, the cut stainless steel pipe (sleeve) and the anchor ear are welded together, the overall structure is as shown in figure 1, the structure is firm, the anchor ear and the sleeve unit are fixed on a 10m electric pole, the fixation is firm, and the sleeve has no displacement up and down.

After the bushing and the hoop unit were fixed to the pole, in order to test the mechanical strength, a load compression test was performed on the bushing, and the bushing was subjected to a force of 1500N to 8000N (g is 9.8N/kg, corresponding to 800kg of equipment) for 10 times, and the amount of vertical deflection of the bushing was measured and compared with a target value, and the test results are shown in table 6:

TABLE 6 statistics of vertical offset for casing compression test

The second implementation: making tripods and pulley units

1. According to the design drawing requirements, purchasing a stainless steel pipe (with the length of 1 meter and the diameter of 30cm), an iron pipe and a pulley for fixing a steel wire rope

Stainless steel pipes, iron pipes and pulleys for fixing wire ropes are purchased in the building material market. According to the requirements of a countermeasure formulation table and a drawing, 1 stainless steel pipe with the diameter of 8cm and the length of 1m, 2 meters of iron pipe with 0.05m1, 2 meters of iron pipe with 0.02 m and 1 pulley are purchased, and the total cost is 700 yuan.

2. And cutting the stainless steel pipe and the iron pipe according to the size of the design drawing.

Cutting a stainless steel pipe and an iron pipe according to the size requirement by a fixed stainless steel processing and manufacturing company, wherein the length of the cut stainless steel pipe is 40cm, the diameter of the cut stainless steel pipe is 8cm, the length of 1 iron pipe is 1.2m, and the diameter of the cut iron pipe is 0.05m, and cutting the other 1 iron pipe into three parts, so that a cross arm and a vertical arm can be conveniently fixed, and the design requirement is met. And simultaneously welding the cut stainless steel pipes (vertical arms), iron pipes (1.2 x 0.05, cross arms) and other 3 iron pipes (the diameter is 0.02 m) together with pulleys, wherein the overall structure diagram is shown in figure 1, the formed tripod has a firm structure, and the tripod is inserted into the fixed casing after welding.

After the tripod was inserted into the casing and fixed, in order to test its mechanical strength, the panelist performed a tensile test, applying a gravity of 1500N to 8000N to one end of the cross arm, performing the test 10 times, measuring the deformation amount of the tripod, and comparing it with a target value, and the results are shown in table 7:

TABLE 7 statistics of deformation amount in tripod tension test

The maximum deformation of the tripod is 0.15mm under the action of tension within 8000N (equivalent to a 400kVA transformer), and the target requirement of the deformation of 0.2mm is met.

And (3) implementation: purchasing hoop, electric hoist and steel wire rope unit

1. Purchase staple bolt and electric block

The design drawing requires to buy 2 pairs of phi 280 hoops and 1 PA800 miniature electric hoist (comprising corresponding 6X19(b) type cross-twisted steel core steel wire ropes with the diameter of 4 millimeters), and the total cost is 1000 yuan.

2. And integrally welding the hoop and the electric hoist and testing the tensile force.

Fix staple bolt and electric block integral welding after at the pole root, as shown in figure 1, stretch out the lifting hook with wire rope along the pole and the pulley on the tripod that has fixed well simultaneously.

The method for testing the vertical displacement of the electric hoist is basically the same as the method for testing the vertical displacement of the electric hoist in the embodiment, and the displacement is controlled within the range of 0.1 m.

After the electric block was fixed to the electric pole, in order to test the mechanical strength thereof, the panelist performed a load-bearing compression test on the electric block portion, and the electric block portion was subjected to an applied force of 1500N to 8000N (g is 9.8N/kg, corresponding to 800kg of equipment) for 10 times, and the amount of vertical deflection of the electric block was measured and compared with a target value, and the test results are shown in table 8:

TABLE 8 statistics of vertical offset of electric block compression test

The steel wire rope can bear 800kg of pulling force, the power of the electric hoist can drive 800kg of equipment, the vertical offset of the electric hoist is less than 0.1m, and the aim of realizing the vertical offset is!

And implementation IV and V: controller and small generator

A matching model of controller and SHW190 mobile electric welding generator was purchased for a total of 1400 fees, the controller and generator being as shown in fig. 1.

The appearance inspection and the product qualification book inspection are carried out on newly purchased equipment, relevant parameters of the generator are checked to meet the requirement of countermeasures, after the group members are electrified, the controller is used for controlling the electric hoist to lift the lifting hook, the small generator can provide a power supply, and the controller can operate the electric hoist to lift and lower the equipment.

In order to verify the effectiveness of the controller, the group member repeatedly uses the controller for 500 times according to the operation flow, the operation of the winch is stable and reliable, and the related design requirements are met. In order to test the reliable performance of the small generator, the generator continuously runs for 48 hours, and the 380V output power supply voltage is tested to be stable and reliable.

And sixthly, implementation: integral assembly and commissioning

And assembling all the manufactured parts, fixing and checking, positioning the generator, randomly using a pole on a certain overhaul site, and hoisting a heavy object of about 800kg for 10 times to normally hoist. The electric hoist is powered by the small generator and the lifting of the equipment is completed by the operation of the controller.

For mounting (outdoor pole breaker for example)

In order to ensure the safety and reliability of equipment hoisting and verify whether the target is realized, the device is assembled in a test base, and after the assembly is completed, a simple experiment is performed to investigate the working condition of the device.

The primary effect test is carried out on a 10kV 3# pole site:

1. the electric hoist and the sleeve are respectively fixed at the electric pole and the pole heel and the pole top by utilizing the anchor ears, so that the two anchor ears are ensured to be positioned at the horizontal position, and one end of the extension of the anchor ears is positioned at the back of the installed outdoor pole-mounted circuit breaker.

2. The steel wire rope is lifted to the upper part through the insulating rope in advance, the lifting hook is placed to a specified position after passing through the two pulley blocks on the tripod at the upper part, and the safety buckle on the pulley block is fastened to prevent the steel wire rope from falling off.

3. An operator can install the outdoor post-mounted short-circuiting device by controlling the electric hoist through the controller, the outdoor breaker is lifted to a proper position by the winch during installation, two installers on the pole move the outdoor breaker to the middle of two telegraph poles through adjustment, the outdoor breaker is lowered by the adjusting controller to complete the installation process, and the outdoor breaker can be replaced by repeated operation.

The device is compact and firm in structure and convenient to detach and install, and a worker replacing the outdoor on-column circuit breaker can master the installation method of the device only through simple training; the outdoor pole-mounted circuit breaker is quick and easy to operate when being lifted, strong in practicability and short in time.

The newly developed portable crane can reduce the hoisting cost of the rack type equipment by more than 30 percent.

The newly developed portable crane has the advantages of simple structure, low cost, portability, convenient installation, small occupied area, simple installation and disassembly, convenient use and suitability for various terrains.

The equipment is used for replacing and hoisting 12 bench type equipment such as a Liwu village and the like by inspecting the working condition: as shown in table 9:

TABLE 9 actual cost for hoisting the gantry equipment using the homemade crane

Through analysis and calculation, the cost can be reduced by more than 30% by adopting the developed portable crane, as shown in table 10, the equipment has simple structure, is convenient to carry and low in cost, and the hoisting equipment is safe and reliable on site, so that the target requirement is met.

TABLE 10 analysis of cost comparison

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A portable crane suitable for mounting a bench device is characterized by comprising a sleeve and hoop unit, a tripod and pulley unit, a winch and hoop unit and a power unit, wherein,

the sleeve and hoop unit comprises a hollow sleeve and at least two hoops which are fixed together, and the hollow sleeve is fixed at the top or the upper part of the electric pole through the at least two hoops so as to fix the tripod and the pulley unit at the upper part of the electric pole;

the tripod and pulley unit comprises a cross arm, a vertical arm, an inclined arm and at least two pulleys arranged at two sides above the cross arm, the vertical arm and the inclined arm form a right-angled triangle support, the diameter of the vertical arm is smaller than that of the hollow sleeve, and the vertical arm is used for being inserted in the hollow sleeve;

the hoisting machine and hoop unit comprises a hoisting machine, at least one hoop and a steel wire rope, the hoisting machine is fixed at the root or the lower part of the electric pole through the at least one hoop, one end of the steel wire rope is connected with the hoisting machine, and the other end of the steel wire rope is provided with a hook and is hung down through at least two pulleys on two sides above the cross arm so as to slide the lifting platform type equipment;

the power unit includes a generator for driving the hoist to lift the rack-type device.

2. The portable gantry crane adapted for mounting a device thereon as recited in claim 1, further comprising a controller unit connected to the hoist for electrically controlling the lifting of the device.

3. The portable crane for mounting a rack-type equipment of claim 1, wherein the hoist is an electric block which can be fixed to the lower part of the electric pole or above the cross arm of the tripod by means of a hoop.

4. The portable crane for mounting a platform according to claim 1, wherein the hollow casing is made of round stainless steel and is welded to the outer sides of the at least two hoops, the tripod is made of solid stainless steel and is welded to form a stable triangular structure, the pulley is welded to the cross arm according to a selected size of the tripod, and the winch is welded to the at least one hoop.

5. A portable crane suitable for mounting of a gantry apparatus according to claim 4, wherein the hollow sleeve has a length of at least 40cm and a diameter of at least 8 cm.

6. The portable gantry crane of claim 1, wherein the vertical arms are stainless steel and no longer than 40cm, the horizontal arms are ferrous and 1.2m long, and the diagonal arms are ferrous.

7. The portable crane for mounting a platform according to claim 1, wherein the size of the hoop is selected according to the type of the electric pole, and the U-shaped hoop is made of 45-sized steel M27 high-strength bolts to reduce the number of bolts.

8. The portable gantry crane of claim 1, wherein the wire rope is an intertwined steel core wire rope.

9. The portable gantry crane of claim 1, wherein the generator is a SHW190 electric welding generator, gasoline based.

10. An operating method of a portable crane for rack equipment installation, applied to the portable crane for rack equipment installation according to any one of claims 1 to 9, comprising:

s1, fixing the winch and the hoop unit at the pole root position through a hoop;

s2, an operator firstly climbs the tower, the sleeve and two hoops of the hoop unit are installed by adopting a rope hanging method, the hoops are ensured to be in a horizontal position, and the extended ends of the hoops are positioned on the opposite surfaces of equipment to be installed;

s3, assembling the cross arm, the inclined arm and the pulley in a vertical arm splicing mode;

s4, lifting the steel wire rope to the upper side through the insulating rope in advance, placing the lifting hook to a specified position after passing through the two pulley blocks on the upper triangular frame, and fastening the safety buckle on the pulley block to prevent the steel wire rope from falling off;

and S5, lifting the equipment to be installed to a proper position through a winch by an operator to complete installation.

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