Construction method for installing single-arm crane

Abstract

The invention provides a construction method for mounting a single-arm crane. The construction method comprises the following steps: step 1, preparation before mounting; the installation environment is safe and reliable, and all assemblies are complete and intact; 2, mounting and adjusting a suspension mechanism; a stable supporting structure is established to bear the rated load capacity; thirdly, a traction hoister and an electric push rod are installed; hoisting and horizontal movement of materials are realized; 4, operation and check adjustment are carried out; normal operation of equipment is ensured; step 5, safe operation regulation; the safety of the construction process is ensured; and 6, using and maintaining. According to the method, many problems existing in a traditional hoisting method are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a construction method for single-arm crane installation. BACKGROUND

[0002] In the construction of curtain walls, the traditional hoisting method often uses a simple crane or a manual lifting device, which has the following disadvantages: the suspension mechanism is designed simply, has poor anti-overturning ability, relies on experience to place counterweights, lacks scientific calculation (such as an anti-overturning safety factor K≥2), and is prone to safety accidents. The safety device is missing or unreliable, such as no centrifugal speed-limiting safety lock, which cannot automatically lock when the steel wire rope breaks. The power system is single, cannot realize the horizontal movement of the hoisted material, needs manual intervention, increases labor intensity and risk. The electrical control system is simple, has no upper and lower limit positions and emergency braking circuit, is inconvenient to operate and prone to overload. Maintenance is not standardized, and the lubrication of the steel wire rope and the hoist is not timely, resulting in a high equipment failure rate. SUMMARY

[0003] The present application discloses a construction method for single-arm crane installation, which aims to solve the following technical problems in traditional hoisting construction: the installation process is complex and unstable, which easily leads to overturning risk, especially when the bearing capacity of the building top support is uncertain. The safety measures are not perfect, such as brake failure, material overspeed falling when the steel wire rope breaks, and lack of automatic locking mechanism. The operation efficiency is low, the hoisting and horizontal movement of the material cannot be seamlessly connected, which affects the construction progress. Maintenance is difficult, equipment components are easily damaged, and the service life is short. The electrical control is not accurate, lacks limit and emergency braking function, and is prone to accidents.

[0004] The specific scheme is as follows: A construction method for single-arm crane installation, comprising the following steps: Step one: preparation before installation; ensure that the installation environment is safe and reliable, and all components are complete and intact; Step two: installation and adjustment of the suspension mechanism; establish a stable support structure to bear the rated load; Step three: installation of the traction hoist and the electric push rod; realize the hoisting and horizontal movement of the material; Step four: operation and inspection adjustment; ensure normal operation of the equipment; Step five: safety operation procedures; ensure safety during construction; Step six: use and maintenance.

[0005] Further, in step one, first reconnaissance site, determine the appropriate and reliable installation location, to ensure that the building or structure support in line with the bearing requirements; then according to the equipment list count the number of components, including the suspension mechanism, traction hoist, rope collector, safety lock, electrical control system, working wire rope, and check the parts to ensure no abnormal situation. Ensure that the installation environment is safe and reliable, all components are complete and intact, to lay the foundation for subsequent installation.

[0006] Further, in step two, the suspension mechanism consists of front beam, middle beam, rear beam, front base, rear base, upper strut, counterweight, reinforcing wire rope, front rod, rear rod, leg, etc. The front and rear beams are inserted into the middle beam and can be adjusted in length. The foot wheels and legs are installed on the front base. First, screw the screw rod into the nut from top to bottom, then install the round bottom plate at the lower part of the screw rod. The locking casters and counterweight rod are installed on the rear base. The counterweight rod is fixed with a split pin at the lower part. Adjust the height of the rod by inserting the front rod into the front base sleeve and the rear rod into the rear base sleeve. Adjust the height of the rod according to the parapet height (adjustment range is 1.5-1.9m) and fix it with bolts. Connect the beam structure by inserting the movable hanger into the front beam, then insert the front and rear beams into the U-shaped seat of the front and rear supports respectively. Connect the front and rear beams with the middle beam to ensure that the distance between the front and rear bases is maximized to maximize the anti-overturning moment. Install the reinforcing wire rope by inserting one end of the reinforcing wire rope into the slot at the top of the upper strut with a pin shaft at the front beam hanger point. Connect the other end of the wire rope to the small connecting sleeve on the rear support rod with a pin shaft and a wire rope clamp. Adjust the screw rod of the screw buckle to tighten the reinforcing wire rope, and the front beam should be raised by 50mm. Check if all the bolts, wire rope clamps, etc. are installed correctly and firmly, and tighten all the bolts. Then place the counterweights evenly on the rear base and tighten the anti-theft bolts.

[0007] Further, the number of counterweights is configured according to the model to ensure that the anti-overturning safety factor K = G·b / F·a ≥ 2, where G is the mass of the counterweight, F is the rated lifting weight, a is the distance from the lifting point to the front base, and b is the distance between the front and rear bases.

[0008] Further, in the step three, install the traction hoist: put the hoist hanger on the suspension mechanism beam, lift the traction hoist, and connect the hanger and the traction hoist with bolts; the traction hoist is composed of a frame, a hoist, a drum, a rope arranging tube, a spring, a guide rope tube, and a lower limit position; the hoist is fixed on the frame with bolts; install the electric push rod: the electric push rod is composed of a connector, a dust cover, a sliding rod, a limit switch, a connecting frame, and a motor; first, put the push rod of the electric push rod in the fully retracted state, push the movable hanger to the middle part of the front beam, determine the installation position of the electric push rod, fix the connecting frame and the electric push rod on the rear beam with bolts, and connect the front end of the push rod with the support of the hoist with bolts. If the installation hole and the support cannot be aligned, rotate the connector to match it; install the limit switch: install the upper limit switch on the movable hanger to limit the upward running range of the hoist; electrical connection: connect the electric push rod and the hoist motor with a cable, and connect the hand-held switch; connect the power cable to the waterproof socket of the hoist motor, and turn on the power supply; the electrical control system is composed of the hoist motor, the electric push rod motor, the upper limit switch, the lower limit switch, the hand-held switch, and the contactor, and adopts a three-phase five-wire power supply.

[0009] Further, in the step four, first, perform a trial run: check whether the connection parts are firm and reliable, whether the nuts are tightened, whether the steel wire rope is intact, and whether the steel wire rope clamp is correctly arranged; check whether the wiring is correct, and the power supply voltage must be within ±5% of the rated voltage; after turning on the power supply, press the button of the hand-held switch, and check whether the operation is normal; manually press the upper limit of the movable hanger, the front and rear limit of the electric push rod, and the lower limit of the traction hoist, and check whether the functions are normal; install the working steel wire rope: one end of the working steel wire rope has been crimped with a lifting hook, and the other end is first sleeved with a spring and a circular impact block, then passed through the hole below the movable hanger, wound around the roller, inserted into the safety lock, and finally inserted into the hoist rope inlet; press the up button of the hand-held switch, insert the steel wire rope head into the pipe hole of the rope collector drum after the steel wire rope comes out of the rope arranging tube, and automatically wind the rope by the rope collector; the rope collector is directly driven by the hoist output shaft, and a one-way clutch is installed on the shaft; position the whole machine: move the whole machine to the working position, lower the legs of the front base, fully load the weight by the legs, lock the casters of the rear base, and lower the working steel wire rope; Then check and adjust: electromagnetic brake adjustment: check the gap D between the armature and the friction disc (should be in the range of 0.5-0.6mm), first loosen the inner hexagonal mounting screw on the electromagnetic chuck, then rotate the hollow screw to adjust the gap, the gap around should be uniform, finally tighten the mounting screw again; check the armature action by energizing, ensure that the armature is completely separated from the friction disc after being attracted, and there is no jamming phenomenon when de-energized; drum tension adjustment: after using the rope collector for a period of time, the drum tension may decrease, which needs to be checked and adjusted regularly; first loosen one of the stop washers, rotate the circular nut in the clockwise direction to increase the tension, or vice versa to decrease the tension, after adjusting properly, put the stop washer into the slot of the circular nut; power failure handling: when power failure occurs, turn off the power switch, if you need to lower the material, take out the slide lever from the hoist handle and insert it into the threaded hole of the brake yoke above the hoist motor, lift the lever upward, open the brake, and make the suspended platform slide down at a uniform speed; mechanical load limiting adjustment: the hoist has a mechanical load limiting function, which can be adjusted by tightening the screw, use a 6mm inner hexagonal wrench to insert from the left adjustment hole, rotate clockwise to increase the load limit, or counterclockwise to decrease; when the load reaches 125% of the rated load, the load limit must work; lubrication and maintenance: the hoist uses gear oil for lubrication, use 80W / 90 ordinary vehicle gear oil or N460 medium load industrial gear oil in summer in the south, the oil amount is 1.8 liters; change the oil for the first time after 100 hours of use, and then change it every 200 hours.

[0010] Further, in step five, communication tools are provided between the operator at the top of the building and the ground personnel to ensure effective communication during operation; ground personnel and vehicle no-go areas are set to ensure safety during construction; measures are taken to prevent materials from colliding with the building structure or rotating; the material condition is observed at all times during lifting, and the material can be moved horizontally after it reaches the target position; the steel wire rope must be replaced when it reaches the scrap condition; it is prohibited to connect the extended steel wire rope in any way; when the whole machine needs to be moved, first loosen the legs of the front base and the casters of the rear base, and there should be no heavy objects on the hooks; emergency handling: if the brake fails or the working steel wire rope breaks, the centrifugal speed limiting safety lock will quickly lock the working steel wire rope to prevent the material from falling further; when operating the safety lock, rotate the short handle counterclockwise to unlock, and rotate the long handle clockwise to open.

[0011] In step six, when the construction operation is completed, the working steel wire rope is removed, the components are disassembled, and protective measures are taken to prevent damage during movement; during transportation, the hoist, safety lock, and electric push rod should be packaged separately and then shipped as a whole; the steel wire rope and electric wire are coiled and can be shipped only after packaging; regular maintenance: including checking the steel wire rope for deformation, breakage, and damage, and replacing it according to the scrap standard; checking the hoist gear oil and replacing it regularly; checking the electrical components to ensure that the frequency converter ground wire and zero wire are complete, the electric control box is hung vertically, and the frequency converter is ventilated and cooled.

[0012] The present application has the advantages of: Through the anti-overturning design of the suspension mechanism, the centrifugal speed limiting safety lock, the multiple limiting switches and the emergency braking circuit, overturning, overspeed falling and overloading are effectively prevented, and the safety of personnel and equipment is ensured.

[0013] The coordinated work of the traction hoist and the electric push rod realizes the automation of material lifting and horizontal movement, reduces manual operation, and speeds up the construction progress; the rope collector automatically winds the rope, simplifying the management of steel wire ropes.

[0014] The regular lubrication and inspection system prolongs the service life of the equipment; the modular design facilitates disassembly and packaging, reducing damage during transportation.

[0015] The electrical control system integrates hand-held switches, frequency converters, etc., to realize precise speed control and remote operation; communication tools ensure smooth communication between the upper and lower parts.

[0016] The suspension mechanism can adjust the height and spacing to adapt to different building environments; the mechanical load limiting function can be adjusted according to the needs to avoid overloading. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The flowchart of the method of the present application.

[0018] Figure 2 The structure diagram of the mobile crane in the present application.

[0019] Figure 3 The schematic diagram of the suspension mechanism in the present application.

[0020] Figure 4 The schematic diagram of the traction hoist in the present application.

[0021] Figure 5 The schematic diagram of the electric push rod in the present application.

[0022] LIST OF REFERENCE NUMBERS: 1-movable hanger, 2-reinforced steel wire rope, 3-front beam, 4-upper support column, 5-front insertion rod, 6-leg, 7-front base, 8-middle beam, 9-rear beam, 10-sling screw buckle, 11-rear insertion rod, 12-universal caster, 13-rear base, 14-counterweight insertion rod, 15-rack, 16-hoist, 17-winding drum, 18-rope arranging pipe, 19-spring, 20-rope guide pipe, 21-lower limit, 22-connection head, 23-dust cover, 24-sliding rod, 25-limiting switch, 26-connection frame, 27-motor. DETAILED DESCRIPTION

[0023] The present application is further illustrated in conjunction with the accompanying drawings and specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the present application and not to limit the scope of the present application.

[0024] As shown, the present application provides a construction method for single-arm crane installation, based on mobile crane, comprising the following steps: Step one: preparation before installation; ensure the installation environment is safe and reliable, all components are complete and intact; Step two: installation and adjustment of suspension mechanism; establish a stable support structure to bear the rated load; Step three: installation of traction hoist and electric push rod; realize the lifting and horizontal movement of materials; Step four: operation and inspection adjustment; ensure normal operation of the equipment; Step five: safety operation procedures; ensure the safety of the construction process; Step six: use and maintenance.

[0025] In step one, first investigate the site to determine a suitable and reliable installation location, ensure that the building or structure support meets the bearing requirements; then count the number of components according to the equipment list, including suspension mechanism, traction hoist, rope collector, safety lock, electrical control system, working steel wire rope, and check each part to ensure there are no abnormal conditions. Ensure that the installation environment is safe and reliable, all components are complete and intact, and lay a foundation for subsequent installation.

[0026] In step two, the suspension mechanism is composed of front beam, middle beam, rear beam, front base, rear base, upper support, counterweight, reinforcing steel wire rope, front insertion rod, rear insertion rod, leg, etc. The front and rear beams are inserted into the middle beam and can be adjusted in length. The foot wheels and legs are installed on the front base: first screw the rod from top to bottom into the nut, then install the circular bottom plate at the lower part of the rod. The locking casters and counterweight insertion rod are installed on the rear base: the counterweight insertion rod is fixed at the lower part with a split pin. Adjust the height of the insertion rod: insert the front insertion rod into the front base sleeve and the rear insertion rod into the rear base sleeve, adjust the height of the insertion rod according to the parapet height (adjustment range is 1.5-1.9m), and fix it with bolts. Connect the beam structure: put the movable hanger on the front beam, insert the front and rear beams into the insertion rod U-shaped seat of the front and rear supports respectively, connect the front beam and the rear beam with the middle beam, ensure that the distance between the front and rear bases is maximized to maximize the anti-overturning moment. Install the reinforcing steel wire rope: one end of the reinforcing steel wire rope is fixed on the front beam lifting point with a pin shaft and then inserted into the slot at the top of the upper support, the other end of the grommet screw is connected to the small connecting sleeve on the rear support insertion rod with a pin shaft, the other end of the steel wire rope is fixed with a steel wire rope clamp after passing through the grommet screw, adjust the screw rod of the grommet screw to tighten the reinforcing steel wire rope, and the front beam is raised by 50mm. Check whether all bolts, steel wire rope clamps, etc. are installed correctly and firmly, and tighten all bolts. Then place the counterweights evenly on the rear base and tighten the anti-theft bolts.

[0027] Further, the number of counterweights is configured according to the model, ensuring the anti-overturning safety factor K = G·b / F·a ≥ 2, wherein G is the mass of the counterweight, F is the rated lifting weight, a is the distance from the lifting point to the front base, and b is the front-to-rear base spacing.

[0028] In the third step, the traction hoist is installed: the hoist hanger is placed on the middle beam of the suspension mechanism, the traction hoist is lifted, and the hanger and the traction hoist are connected with bolts; the traction hoist is composed of a frame, a hoist, a drum, a rope arranging pipe, a spring, a guide rope pipe, and a lower limit position; the hoist is fixed on the frame with bolts; the electric push rod is installed: the electric push rod is composed of a connecting head, a dust cover, a sliding rod, a limit switch, a connecting frame, and a motor; first, the push rod of the electric push rod is placed in a fully retracted state, the movable hanger is pushed to the middle part of the front beam, the installation position of the electric push rod is determined, the connecting frame and the electric push rod are fixed on the rear beam with bolts, and the front end of the push rod is connected with the support of the hoist with bolts. If the installation hole and the support cannot be aligned, the connecting head can be rotated to match it; the limit switch is installed: the upper limit switch is installed on the movable hanger to limit the upward running range of the hoist; electrical connection: the electric push rod and the hoist motor are connected with cables, and the hand-held switch is connected; the power cable is connected to the waterproof socket of the hoist motor, and the power supply is turned on; the electrical control system is composed of the hoist motor, the electric push rod motor, the upper limit switch, the lower limit switch, the hand-held switch, and the contactor, and a three-phase five-wire power supply is used.

[0029] In the fourth step, first, the trial operation is performed: check whether the connection parts are firm and reliable, whether the nuts are tightened, whether the steel wire rope is intact, and whether the steel wire rope clamp is correctly arranged; check whether the wiring is correct, and the power supply voltage must be within ±5% of the rated voltage; after the power supply is turned on, press the button of the hand-held switch to check whether the operation is normal; manually press the upper limit of the movable hanger, the front and rear limit of the electric push rod, and the lower limit of the traction hoist to check whether the functions are normal; the working steel wire rope is installed: one end of the working steel wire rope is crimped with a lifting hook, a spring and a circular impact block are first sleeved on the other end, the lower end is inserted from the plate hole below the movable hanger, passes through the roller, is inserted into the safety lock, and finally is inserted into the hoist rope inlet; press the up button of the hand-held switch, the steel wire rope is inserted into the pipe hole of the rope collector drum after coming out of the rope arranging pipe, and the rope is automatically wound by the rope collector; the rope collector is directly driven by the hoist output shaft, and a one-way clutch is installed on the shaft; the entire machine is positioned: the entire machine is moved to the working position, the legs of the front base are lowered to fully bear the weight, the casters of the rear base are locked, and the working steel wire rope is lowered; Then check and adjust: electromagnetic brake adjustment: check the gap D between the armature and the friction disc (should be in the range of 0.5-0.6mm), first loosen the inner hexagonal mounting screw on the electromagnetic chuck, then rotate the hollow screw to adjust the gap, the gap around should be uniform, finally tighten the mounting screw again; check the armature action by energizing, make sure the armature completely separates from the friction disc after being attracted, and there is no jamming phenomenon when de-energized; drum tension adjustment: after using the rope collector for a period of time, the drum tension may decrease, which needs to be checked and adjusted regularly; first loosen one of the stop washer flaps, rotate the circular nut in the clockwise direction to increase the tension, or vice versa to decrease the tension, after adjusting properly, fasten the stop washer flap into the groove of the circular nut; power failure handling: when power failure occurs, turn off the power switch, if you need to lower the material, take out the slide lever from the hoist handle and insert it into the threaded hole of the brake yoke on the top of the hoist motor, lift the lever upward, open the brake, and make the suspended platform slide down at a uniform speed; mechanical load limiting adjustment: the hoist has a mechanical load limiting function, which can be adjusted by tightening the screw, use a 6mm inner hexagonal wrench to insert from the left adjustment hole, rotate clockwise to increase the load limit, or counterclockwise to decrease; when the load reaches 125% of the rated load, the load limit must work; lubrication and maintenance: the hoist uses gear oil for lubrication, use 80W / 90 ordinary vehicle gear oil or N460 medium load industrial gear oil in summer in the south, the oil amount is 1.8 liters; change the oil for the first time after 100 hours of use, and then change it every 200 hours.

[0030] In step five, communication tools are provided between the operator at the top of the building and the ground personnel to ensure effective communication during operation; ground personnel and vehicle no-go areas are set to ensure safety during construction; measures are taken to prevent materials from colliding with the building structure or rotating during hoisting; the material condition is observed at all times during lifting, and the material can be moved horizontally after it reaches the target position; the steel wire rope must be replaced when it reaches the scrap condition; it is prohibited to connect the extended steel wire rope in any way; when the whole machine needs to be moved, first loosen the legs of the front base and the casters of the rear base, and there should be no heavy objects on the hooks; emergency handling: if the brake fails or the working steel wire rope breaks, the centrifugal speed limiting safety lock will quickly lock the working steel wire rope to prevent the material from falling further; when operating the safety lock, turn the short handle counterclockwise to unlock, and turn the long handle clockwise to open.

[0031] In step six, when the construction work is completed, the working steel wire rope is removed, the components are disassembled, and protective measures are taken to prevent damage during movement; during transportation, the hoist, safety lock, and electric push rod should be packaged separately and then shipped as a whole; the steel wire rope and electric wire are coiled and can be shipped only after packaging; regular maintenance: including checking the steel wire rope for deformation, breakage, and damage, and replacing it according to the scrap standard; checking the hoist gear oil and replacing it regularly; checking the electrical components to ensure that the frequency converter ground wire and zero wire are complete, the electric control box is hung vertically, and the frequency converter is ventilated and cooled.

[0032] The technical means disclosed in the present application are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that, for ordinary skilled persons in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which are also considered within the scope of protection of the present application.

Claims

1. A construction method for single-boom installation, characterized by, Includes the following steps: Step 1: Preparations before installation; Ensure the installation environment is safe and reliable, and that all components are complete and in good condition; Step 2: Installation and adjustment of the suspension mechanism; establish a stable support structure to bear the rated load; Step 3: Installation of the traction hoist and electric push rod; enabling the lifting and horizontal movement of materials; Step 4: Operation, inspection, and adjustment; ensure the equipment is operating normally; Step 5: Safe operating procedures; ensure safety during the construction process; Step Six: Use and Maintenance.

2. A method of construction for a single-arm crane installation according to claim 1, characterised in that, In step one, the construction site is first surveyed to determine a suitable and reliable installation location, ensuring that the support of the building or structure meets the load-bearing requirements; then, the quantity of each component is counted according to the equipment list, and each component is checked to ensure that there are no abnormalities.

3. A method of construction for a single-arm crane installation according to claim 1, characterised in that, In step two, the suspension mechanism consists of a front beam, middle beam, rear beam, front base, rear base, upper support column, counterweight, reinforcing steel wire rope, front insert rod, rear insert rod, and outriggers. The front and rear beams are inserted into the middle beam and are telescopically adjustable. Specifically, casters and outriggers are installed on the front base: first, screw the screw into the nut from top to bottom, then install a circular base plate at the bottom of the screw; lockable casters and counterweight insert rods are installed on the rear base: the lower part of the counterweight insert rod is fixed with a cotter pin; adjusting the height of the insert rods: insert the front insert rod into the front base sleeve, and the rear insert rod into the rear base sleeve, adjust the height of the insert rods according to the height of the parapet wall, and fix them with bolts; connecting the beam structure: the movable hanger is fitted onto the front beam. The front and rear beams are respectively installed into the U-shaped seats of the front and rear supports. The front and rear beams are connected by the middle beam, ensuring that the distance between the front and rear bases is maximized to maximize the anti-overturning moment. Install the reinforcing steel wire rope: attach one end of the reinforcing steel wire rope to the suspension point of the front beam with a pin and then embed it into the groove at the top of the upper support. Connect one end of the rigging screw buckle to the small connecting sleeve on the rear support rod with a pin. The other end of the steel wire rope passes through the rigging screw buckle and is fixed with a steel wire rope clamp. Adjust the screw of the screw buckle to tighten the reinforcing steel wire rope and tilt the front beam upward. Check that all bolts, steel wire rope clamps, etc. are installed correctly and securely, and tighten all bolts. Then, evenly place the counterweight on the rear base and tighten the anti-theft bolts.

4. A method of construction for a single-arm crane installation according to claim 3, characterised in that, The number of counterweights is configured according to the model to ensure the anti-overturning safety factor K = G·b / F·a ≥ 2, where G is the counterweight mass, F is the rated lifting weight, a is the distance from the lifting point to the front base, and b is the distance between the front and rear bases.

5. A method of construction for a single-arm crane installation as claimed in claim 1, wherein, In the third step, install the traction hoist: place the hoist hanger on the suspension mechanism beam, lift the traction hoist, and connect the hanger and the traction hoist with bolts; the traction hoist is composed of a frame, a hoist, a drum, a rope arranging pipe, a spring, a guide rope pipe, and a lower limit position; the hoist is fixed on the frame with bolts; install the electric push rod: the electric push rod is composed of a connector, a dust cover, a sliding rod, a limit switch, a connecting frame, and a motor; first, place the push rod of the electric push rod in a fully retracted state, push the movable hanger to the middle part of the front beam, determine the installation position of the electric push rod, fix the connecting frame and the electric push rod on the rear beam with bolts, and connect the front end of the push rod with the support of the hoist with bolts; if the installation hole and the support cannot be aligned, rotate the connector to match it; install the limit switch: install the upper limit switch on the movable hanger to limit the upward running range of the hoist; electrical connection: connect the electric push rod and the hoist motor with a cable, and connect the hand-held switch; Connect the power cable to the waterproof socket of the hoist motor, and turn on the power supply; the electrical control system is composed of a hoist motor, an electric push rod motor, an upper limit switch, a lower limit switch, a hand-held switch, and a contactor, and adopts a three-phase five-wire power supply.

6. A method of construction for single-arm crane installation according to claim 1, characterized in that, In the fourth step, first commissioning: check the connection parts are firm and reliable, nut is tightened, wire rope is intact, wire rope clamp is arranged correctly; check the wiring is correct, the power supply voltage must be within the rated voltage of ± 5%; after the power is turned on, press the button of the hand-held switch, check if the operation is normal; manually press the upper limit of the movable hanger, the front and rear limit of the electric push rod, and the lower limit of the traction hoist, check if the function is normal; install the working wire rope: one end of the working wire rope has been crimped with a lifting hook, and the other end is first sleeved with a spring and a circular impact block, then inserted from the hole below the movable hanger, passed through the roller, inserted into the safety lock, and finally inserted into the rope inlet of the hoist; press the up button of the hand-held switch, after the wire rope comes out of the rope arranging pipe, insert the wire rope head into the pipe hole of the rope collector drum, and automatically wind the rope by the rope collector; the rope collector is directly driven by the output shaft of the hoist, and a one-way clutch is installed on the shaft. Only when the hoist is lifted, the clutch can drive the friction transmission system to rotate; position the whole machine: move the whole machine to the working position, lower the legs of the front base, and fully load the weight by the legs, lock the casters of the rear base, and lower the working wire rope; then check and adjust: electromagnetic brake adjustment: check the gap D between the armature and the friction disc, loosen the inner hexagonal mounting screw on the electromagnetic chuck, rotate the hollow screw to adjust the gap, and the gap around should be uniform, and finally tighten the mounting screw; check the armature action after power on to ensure that the armature is completely separated from the friction disc after being attracted, and there is no jamming phenomenon when power off; drum tension adjustment: after the rope collector is used for a period of time, the drum tension may decrease and needs to be checked and adjusted regularly; loosen one of the stop washers, rotate the circular nut in the clockwise direction to increase the tension, or vice versa, and after adjusting appropriately, lock the stop washer into the groove of the circular nut; power failure handling: when power failure occurs, turn off the power switch, if you need to lower the material, take out the slide lever from the handle of the hoist, and rotate it into the threaded hole of the brake lever fork above the hoist motor, lift the lever upward, open the brake, and make the suspended platform slide uniformly; mechanical load limiting adjustment: the hoist has a mechanical load limiting function, which is adjusted by tightening the screw, using a 6mm inner hexagonal wrench to insert from the left adjustment hole, rotating clockwise to increase the load limit, and counterclockwise to decrease; when the load reaches 125% of the rated load, the load limit must work; lubrication and maintenance: the hoist uses gear oil lubrication, uses 80W / 90 ordinary vehicle gear oil or N460 medium load industrial gear oil in summer in the south, and the oil amount is 1.8 liters; change the oil for the first time after 100 hours of use, and change it every 200 hours thereafter.

7. A method of construction for a single-arm crane installation according to claim 1, wherein, The fifth step, the operator on the building top and the ground personnel are equipped with communication tools to ensure effective communication during the operation; the ground setting personnel and vehicle forbidden area are ensured to ensure the safety of the construction operation; measures are taken to prevent the material from colliding with the building structure or rotating when hoisting the material; the material condition is observed at all times during the lifting process, and the material can be moved horizontally after being lifted to the target position; the steel wire rope must be replaced when it reaches the scrap condition; it is prohibited to use any way to connect the lengthened steel wire rope; when the whole machine needs to be moved, the supporting legs of the front base and the casters of the rear base are loosened, and there should be no heavy objects on the hook; emergency treatment: if the brake of the lifting machine fails or the working steel wire rope breaks, the centrifugal speed limit type safety lock will quickly lock the working steel wire rope to prevent the material from continuing to fall; when operating the safety lock, the short handle is turned counterclockwise to unlock, and the long handle is turned clockwise to open.

8. A method of construction for a single-arm crane mounted according to claim 1, characterized in that, The sixth step, when the construction operation is completed, the working steel wire rope is removed, the parts are disassembled, and protection measures are taken to prevent damage during moving; during transportation, the lifting machine, safety lock and electric push rod should be packaged separately and then transported as a whole; The steel wire rope and electric wire are wound and packaged before being transported; regular maintenance: including checking whether the steel wire rope is deformed, broken or damaged, replacing it according to the scrap standard; checking the lifting machine gear oil and replacing it regularly; checking the electrical elements to ensure that the frequency converter ground wire and zero wire are complete, the electric control box is vertically hung, and attention is paid to the ventilation and heat dissipation of the frequency converter.

Images