Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
  • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
  • B66C23/005—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with balanced jib, e.g. pantograph arrangement, the jib being moved manually
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
  • B66C13/00—Other constructional features or details
  • B66C13/16—Applications of indicating, registering, or weighing devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
  • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
  • B66C23/54—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with pneumatic or hydraulic motors, e.g. for actuating jib-cranes on tractors
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
  • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
  • B66C23/88—Safety gear
  • B66C23/90—Devices for indicating or limiting lifting moment
  • B66C23/905—Devices for indicating or limiting lifting moment electrical

Definitions

• the present invention relates to an automatic air balancing lifter, and in particular to an automatic air balancing lifter which is capable of automatically maintaining a balanced state in accordance with a varying load for thereby providing a user with enhanced convenience and is capable of significantly enhancing a safety of an equipment by stopping an operation of a lifter in a certain situation.
• an apparatus which is designed to transport a large size or heavy product, is provided with an automatic air balancing lifter so that a worker can move a certain load in a state a balance state is maintained by previously setting a balance pressure based on a load weight and increasing a load based on a pneumatic control.
• the air balancing lifter comprises a connection rod 360 which includes a gripping unit for gripping a load 370 having a certain weight; a rotation arm 350 which changes the load 370 in a left or right direction; an operation rod 310 which is hinged at the rotation arm 350 and moves the load 370 in an up or down direction; a driving unit which is vertically connected with the operation rod 310 and has an air cylinder and a pneumatic circuit for moving the rotation rod 310; and a support member 300 which mounts and supports the driving unit.
• the air cylinder comprises an air balancing cylinder for balancing in a non- load state; a lifting cylinder which operates in sync with the air balancing cylinder for balancing when the load 350 is applied; and a pneumatic circuit for controlling the air balancing cylinder and the lifting cylinder.
• the pneumatic circuit comprises a main regulator 10 for providing a certain pneumatic pressure; a non-load balance regulator 12 which is in series connected with the main regulator 10 for controlling pneumatic pressure; a shuttle valve 20 which is in series connected with the non-load balance regulator 12 and the air balancing cylinder 170, respectively; a toggle switch 14 and a solenoid valve 18 which are in parallel connected with the non- load balance regulator 12 and the shuttle valve 20; and a load balance regulator 16 which is in parallel connected with the toggle switch 14 and the solenoid valve 18, respectively.
• a load automatic detection sensor unit 200 is engaged at an upper side of the air balancing cylinder 170 for sensing a displacement of the load.
• a check valve is connected at a pneumatic pipe between the load automatic detection sensor unit 200 and an input terminal of the load balance regulator 18.
• a connection rod, engaged with a muffler, is provided at a pneumatic pipe between an output terminal of the main regulator 10 and the load automatic detection sensor unit 200.
• the load automatic detection sensor unit 200 is connected with the lifting cylinder 180 through a check valve.
• the load automatic detection sensor unit 200 comprises a touch rod 210 which is engaged at the air balancing cylinder 170 for detecting load; valve lifters 222 and 224 which operate by the touch rod 210; and varying valves 223 and 225 for outputting control levels based on the variations of the valve lifters 222 and 224.
• the air balancing lifter sets an initial value of non-load state. Namely, the toggle switch 14 is turned off, and the pneumatic pressure supplied through the main regulator 10 is controlled by the non-load balance regulator 12 and is supplied to the air balancing cylinder 170 through the shuttle valve 20, so that the touch rod 210 is positioned at the right center of two valve lifters 222 and 224.
• the balance of the load state is set after the load 370 is engaged at the connection rod 360.
• the toggle switch 14 is turned on, and the pressure of the lifting cylinder 180 is controlled through the load balance regulator 16.
• the solenoid valve 18 is opened, so that the pressure of the air balance cylinder 170 is controlled as the pneumatic pressure is applied to the load balance regulator 16 through the main regulator 10.
• the pressure control of the balance regulator 16 is varied and set based on the weight of the load 370.
• the lifting cylinder 180 performs an inlet and outlet compensation in accordance with a control of each varying valve 223, 225.
• the air balancing cylinder 170 always maintains an intermediate position, with a certain physical force not being applied to the air balancing cylinder after the compensation of the lifting cylinder 180 is performed.
• the toggle switch 14 is turned off, and the work is finished.
• an object of the present invention to provide an automatic air balancing lifter which is capable of improving a work convenience by automatically performing a balancing control in accordance with a load which changes after a balancing operation is performed with respect to an initial non-load state.
• an air balancing lifter which comprises a connection rod provided with a gripping means for gripping a load having a certain weight, a rotation arm for changing a position of the load, an operation rod which is hinged at the rotation arm for moving the load in up and down directions, a balancing cylinder for balancing in a non-load state, a lifting cylinder which operates in sync with the balancing cylinder for balancing when a load operates, a pneumatic circuit for controlling the balancing cylinder and the lifting cylinder, a touch rod which is connected with the lifting cylinder and is movable, a pair of valve lifters which are connected with the balancing cylinder and operate in contact with the touch rod, and a load automatic detection sensor unit which detects a displacement of the operation rod based on the load based on an operation of a varying valve opened and closed in accordance with an operation of the valve lifter and outputs a load signal to the pneumatic circuit based on the detected displacement value, there is
• the pneumatic circuit comprises a main regulator 10 which provides a certain pneumatic pressure; a balance regulator 15 which is in series connected with the main regulator and supplies a certain pneumatic pressure to the balancing cylinder 135; a shuttle valve 20 which receives a pneumatic pressure, which is supplied through the balance regulator 15, through its one input terminal and outputs to the balancing cylinder 135; an up button 25 which is in series connected with the main regulator 10 and moves up the lift piston 150 by supplying a pneumatic pressure to the lifting cylinder 155, with the pneumatic pressure being supplied through the main regulator 10; an up operator valve 50 connected between the up button 25 and the lifting cylinder; and a down button 30 which is connected with the other output terminal of the shuttle valve 20 for discharging a pneumatic pressure of an interior of the lifting cylinder 155 to the outside, wherein the up operator valve 50 receives an output of the up button 25 in parallel with the lifting cylinder 155 through a check valve 45, and one output terminal (A) is connected with the other input terminal of the shuttle valve 20.
• an emergency button 35 which is connected with an emergency operator valve 40 and prevents a pneumatic pressure of an interior of the lifting cylinder 155 from communicating with an outside, with the emergency operator valve 40 being designed to receive a pneumatic pressure through the other output terminal (B) of the up operator valve 50, and with one output terminal (A) being connected with an input terminal ( D of the varying valve 225, and with the other output terminal (B) being disconnected.
• a balancing control is automatically performed with respect to a load which changes after a balancing state of an initial non-load is controlled, so that a work efficiency is significantly enhanced based on an easier and convenient operation.
• the price of a product decreases with a simplified construction of a pnenumatic circuit.
• Figure 1 is a schematic circuit diagram illustrating an automatic air balancing lifter according to an embodiment of the present invention
• Figure 2 is a cross sectional view illustrating a cylinder according to an embodiment of the present invention, while showing an enlarged portion 1 K' of Figure 1 ;
• Figure 3 is a schematic view illustrating a whole construction of an automatic air balancing lifter according to a first embodiment of the present invention
• Figure 4 is a schematic circuit diagram illustrating a pneumatic circuit of a conventional balance lifter.
• Figure 5 is an enlarged view of a load detection sensor unit of Figure 4.
• Figure 1 is a schematic circuit diagram illustrating an automatic air balancing lifter according to an embodiment of the present invention
• Figure 2 is a cross sectional view illustrating a cylinder according to an embodiment of the present invention, while showing an enlarged portion 'K' of Figure 1
• Figure 3 is a schematic view illustrating a whole construction of an automatic air balancing lifter according to a first embodiment of the present invention.
• the automatic air balancing lifter comprises a connection rod 360 which includes a gripping unit for gripping a load 370 having a certain weight and a controller; a rotation arm 350 which changes the position of the load 370 in a left or right direction; an operation rod 310 which is hinged at the rotation arm 350 and moves the load 370 in an up or down direction; a driving unit which is vertically connected with the operation rod 310 and includes an air cylinder and a pneumatic circuit for driving the operation rod 310, and a support member 300 for mounting and supporting the driving unit.
• the air cylinder comprises a balancing cylinder 135 for balancing in a non-load state; and a dual cylinder 100 which is in series integrated with the balancing cylinder 135 for balancing when the load 350 operates, with the dual cylinder 100 belonging to the lifting cylinder 155.
• a balancing shaft 120 and a balance piston 130 are inserted into a cylindrical inner upper side which forms the dual cylinder 100 and has a certain length.
• An end cap 110 is sealingly engaged at an upper end of the balance cylinder 135.
• a lift piston 150 and a lifting shaft 125 are inserted into an inner lower side which forms the dual cylinder 100.
• An end cap 115 is sealingly engaged at a lower end of the lifting cylinder 155.
• a balancing manifold 137 is connected at the end cap 110 of the upper end of the balance cylinder 135 for receiving an air pressure of the interior of the balance cylinder 135.
• a lifting manifold 157 is connected at the end cap 115 of the lower end of the lifting cylinder 155 for receiving an air pressure of the interior of the lifting cylinder 155.
• a discharge outlet 160 is formed between the balancing cylinder 135 and the lifting cylinder 155 for receiving or discharging the air of the interior of the dual cylinder 100.
• the dual cylinder 100 is movable up and down with respect to the lifting shaft 125.
• the upper end of the balancing shaft 120 is connected with the operation rod 310 through the balancing hinge 330 and is movable up and down.
• the operation rod 310 is movable up and down with respect to the load hinge 320.
• the balancing shaft 120 is also movable up and down.
• a load automatic detection sensor unit 200 adapted to detect the position of the load
• connection rod 360 a pneumatic circuit which receives a signal of the load automatic detection sensor unit 200 are engaged at the upper side of the balancing cylinder 135, so that a certain work for repeating the up and down movements of the load 370 having a certain weight is performed through the connection rod 360.
• the load automatic detection sensor unit 200 comprises a connection member
• a touch rod 210 which are attached to the end cap 110 of the upper end of the dual cylinder 100; and varying valves 223 and 225 and valve lifters 222 and 224 which are connected at the upper end of the balancing shaft 120, respectively.
• the touch rod 210 since the touch rod 210 is attached to the dual cylinder 100, it concurrently moves up and down based on the up and down movements of the dual cylinder 100. Since the varying valves 223 and 225 and the valve lifters 222 and 224 are attached to the balancing shaft 120, respectively, they move up and down based on the up and down movements of the operation rod 310.
• Both corners of the contacting surface of the touch rod 210 contacting with the valve lifters 222 and 224 are chamferred at certain inclination angles, so that as the touch rod 210 moves up and down, the opened degrees of the valve lifters 222 and 224 are getting increased from the closed state and maintain the maximum state, and then the opened degrees of the same are getting decreased from the maximum opened state and maintains the closed state.
• the opened states of the varying valves 223 and 225 are controlled based on the operations of the valve lifters 222 and 224.
• the pneumatic circuit comprises a main regulator 10 for providing a certain pneumatic pressure; a balance regulator 15 which is in series connected with the main regulator 10 for supplying a certain pneumatic pressure to the balancing cylinder 135; a shuttle valve 20 which receives a pneumatic pressure from the balance regulator 15 through its one end and outputs to the balancing cylinder 135; an up button 25 which is in series connected with the main regulator 10 and supplies a pneumatic presusre to the lifting cylinder 155 through the main regulator 10 for thereby moving up the lifter piston 150; a down button 30 for discharging a pneumatic pressure of the lifting cylinder 155 to the outside; and an emergency button 35 for preventing the pneumatic pressure of the lifting cylinder 155 from communicating with the outside.
• An up operator valve 50 is provided between the up button 25 and the lifting cylinder 155.
• the up operator valve 50 receives an output of the up button 25 in parallel with the lifting cylinder 155 through the check valve 45 (P), with one output terminal (A) being connected with the other input terminal of the shuttle valve 20.
• the emergency button 35 is connected with the emergency operator valve 40.
• the emergency operator valve 40 receives through the other output terminal (B) of the up operator valve 50 (P), with one output terminal (A) being connected with the input terminal ®of the varying valve 225, and with the other output terminal (B) being disconnected.
• the down button 30 is connected with the other output terminal of the shuttle valve 20.
• the input terminal ⁇ of the varying valve 223 receives a pneumatic pressure from the main regulator 10 through the check valve 10 and is in parallel connected with the output terminal (A) of the emergency operator valve 40 through the output terminal ( D and the output terminal ® of the varying valve 225, respectively.
• the input terminal ® of the varying valve 225 is connected with the main regulator 10 through the check valve 60.
• the varying valve 223 As the varying valve 223 is opened, the pneumatic pressure of the main regulator 10 is supplied to the lifting cylinder 155 through the check valve 55 and the input and output terminals ® and @. Namely, the above operation continues until the touch rod 210 is positioned at the intermediate portion of the valve lifters 222 and 224. When the touch rod 210 is positioned at the intermediate portion, the varying valve 223 is closed, and the balancing operation of the non-load state is performed.
• the load 370 is moved up by the user without automatically moving up the same, the load 370 is moved up by pressing the up button 25.
• the up button 25 is pressed, in the up operator valve 50, the input terminal (P) and the other output terminal (B) are connected with the one output terminal (A) based on the operation of the solenoid. Therefore, the pneumatic pressure of the main regulator 10 supplied based on the up button 25 is supplied to the balancing cylinder 135 through the up operator valve 50 and the shuttle valve 20, so that the balancing shaft 120 moves down for thereby moving up the load 370.
• the load 370 is automatically moved down by operating the down button 30.
• the pressure of the balancing cylinder 135 is transferred to the down button 30 through the shuttle valve 20 and is discharged to the outside based on the down button 30 for thereby moving down the load 370.
• the operation of the dual cylinder 100 is stopped by pressing the emergency button 35. In other words, in the case that the emergency button 35 is operated, the operation of the dual cylinder 100 is stopped irrespective of the load 370, so that the operation rod 310 is fixed.
• the emergency operator valve 40 allows the input terminal (P) and the one output terminal (A) to be connected with the input terminal (P) and the other output terminal (B) based on the operation of the solenoid. At this time, since the other output terminal (B) is the closed terminal, the dual cylinder 100 is fixed by disconnecting the pressure of the lifting cylinder 155.
• a balancing control is automatically performed with respect to a load which changes after a balancing state of an initial non-load is controlled, so that a work efficiency is significantly enhanced based on an easier and convenient operation.
• the price of a product decreases with a simplified construction of a pneumatic circuit. Even when an unexpected situation occurs, it is possible to counter the emergency state by stopping all operations of the lifter using an emergency stop unit provided according to the present invention, so that a reliability and safety of the equipment is significantly enhanced.

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Cited By (6)

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Citations (4)

• 2006
  • 2006-05-09 KR KR1020060041262A patent/KR100639604B1/ko active IP Right Grant
  • 2006-06-01 WO PCT/KR2006/002109 patent/WO2007129782A1/en active Application Filing

Patent Citations (4)

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