CN201442833U

CN201442833U - Arm support lifting mechanism

Info

Publication number: CN201442833U
Application number: CN2009200134049U
Authority: CN
Inventors: 李兴德; 于桂芳; 郭维斌
Original assignee: LIAONING FUWA JINZHOU HEAVY MACHINERY CO Ltd
Current assignee: LIAONING FUWA JINZHOU HEAVY MACHINERY CO Ltd
Priority date: 2009-04-29
Filing date: 2009-04-29
Publication date: 2010-04-28
Anticipated expiration: 2019-04-29

Abstract

An arm support lifting mechanism comprises a slewing platform bracket, an arm support mechanism and a derricking oil cylinder; and one end of the derricking oil cylinder is hinged to the arm support mechanism. The utility model is characterized in that an arm support support saddle is connected to the slewing platform bracket through a front support arm and a back support arm; the arm support support saddle, the front support arm, the slewing platform bracket and the back support arm are hinged in sequence so as to form a parallel four-bar mechanism; a lifting oil cylinder is arranged in the parallel four-bar mechanism along the diagonal line of the parallel four-bar mechanism; and both the back end of the arm support mechanism and the other end of the derricking oil cylinder are hinged to the arm support support saddle. The utility model has the advantages an initial operation height can be reached by unfolding the parallel four-bar mechanism when the arm support mechanism does not pitch, thereby improving initial operation height and promoting the performance of a whole machine; meanwhile, bridge load during the running state of a vehicle can be adjusted and balanced, thereby improving running stability; and the application range is wide, that is, the arm support lifting mechanism can be applied in arm support-type construction machinery such as cranes, concrete pump trucks and the like, and special vehicles such as overhead working trucks, fire trucks and the like.

Description

Arm support lifting mechanism

Technical field

The utility model relates to a kind of mechanical lifting mechanism, particularly a kind of arm support lifting mechanism that uses in boom type construction machinery and equipments such as hoisting crane, concrete pump truck and special-use vehicles such as aerial platform, the platform-type fire extinguishing tanker of ascending a height.

Background technology

In current construction machinery and equipment and special-use vehicle market, all lift arm series products, all be to be fixed mount with the rotary table, the afterbody hinge of lift arm and the following hinge of luffing mechanism are fixed on the rotary table, the last hinge of luffing mechanism is connected with lift arm, has just constituted the luffing tri-joint mechanism like this between lift arm, luffing mechanism, rotary table.Realize the pitching of lift arm by hydraulic ram or steel rope tractive, thereby enlarged the scope of work of construction machinery and equipment.The above product, owing to be subjected to turning round the height of fixed mount, the length of lift arm and the angle control of luffing, its operation height is limited; In addition, the center of gyration when regulating vehicle running state axle load and operation need be provided with counterweight at the rotary table afterbody.

Summary of the invention

The purpose of this utility model is the arm support lifting mechanism that a kind of applied range will be provided, and this mechanism can increase substantially the operation height that hoists, but and the axle load of balance complete machine motoring condition and the center of gyration of operating condition, make stressedly to reach best.

The utility model is achieved in that it has a turn table support, beam mechanism and amplitude oil cylinder, be provided with hydraulic control system at the turn table support, one end of amplitude oil cylinder is hinged on the beam mechanism, its special character is: be connected with the jib bearing by front arm and back arm on the turn table support, jib bearing and front arm, parallel four-bar linkage of the hinged successively formation of turn table support and back arm, be provided with elevating ram along its diagonal line in parallel four-bar linkage, the rear end of beam mechanism and the other end of amplitude oil cylinder are hinged on respectively on the jib bearing.

Above-mentioned arm support lifting mechanism, described elevating ram lower end are hinged on the jointed shaft between turn table support and the back arm.

The utility model has the advantages that: owing between turn table support and jib bearing, parallel four-bar linkage is set, when making the beam mechanism of all boom type construction machinery and equipments such as hoisting crane and special-use vehicle also not carry out pitching, rely on the expansion of parallel four-bar linkage just can reach an initial operation height, improve the operation height that hoists greatly, promoted the complete machine performance of boom type construction machinery and equipments such as hoisting crane and special-use vehicle; Simultaneously, when parallel four-bar linkage is in retracted state, can adjustment vehicle running state axle load, improve riding stability; When this arm support lifting mechanism is in the lifting operating condition, on the center of gyration when stress point has dropped on operation, make the stressed the best that reaches, it is heavy to need not other establishing; This arm support lifting mechanism applied range may be used in boom type construction machinery and equipments such as hoisting crane, concrete pump truck and the special-use vehicles such as aerial platform, the platform-type fire extinguishing tanker of ascending a height.

Description of drawings:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the left view (removing beam mechanism and amplitude oil cylinder) of Fig. 1;

Fig. 3 is the scheme drawing that the utility model parallel four-bar linkage is in retracted state;

Fig. 4 is the schematic diagram of hydraulic control system in the utility model.

Among the figure: turn table support 1, back arm 2, jib bearing 3, beam mechanism 4, amplitude oil cylinder 5, front arm 6, elevating ram 7, hydraulic control system 8, fuel tank 9, oil pump 10, combined operation valve 11, balance cock 12, bidirectional balanced valve 13.

The specific embodiment

As shown in the figure, this arm support lifting mechanism has a turn table support 1 and beam mechanism 4, on turn table support 1, be connected with jib bearing 3 by front arm 6 and back arm 2, jib bearing 3 and front arm 6, parallel four-bar linkage of the hinged successively formation of turn table support 1 and back arm 2, in parallel four-bar linkage, be provided with an elevating ram 7 along its diagonal line, the cylinder barrel lower end of elevating ram 7 is hinged on the jointed shaft between turn table support 1 and the back arm 2, and the piston rod of elevating ram 7 upper end is hinged on the jointed shaft between jib bearing 3 and the front arm 6.Described beam mechanism 4 rear ends are hinged on the jib bearing 3, and symmetry is hinged with amplitude oil cylinder 5 between beam mechanism 4 and jib bearing 3.On turn table support 1, be provided with the hydraulic control system 8 of control elevating ram 7 and amplitude oil cylinder 5 work, hydraulic control system 8 is by fuel tank 9, oil pump 10, is located at the combined operation valve 11 that oil pump 10 exports, be located at the balance cock 12 on the oil circuit between combined operation valve 11 and the amplitude oil cylinder 5, and be located at 13 formations of the bidirectional balanced valve on the oil circuit between combined operation valve 11 and the elevating ram 7.

During work, state by hydraulic control system 8 control elevating rams 7, when the piston rod of elevating ram 7 stretches out, parallel four-bar linkage is launched, make front arm 6 and back arm 2 left-hand revolutions to vertical state, parallel four-bar linkage reaches an initial job height with beam mechanism 4 parallel liftings after launching, and by hydraulic control system 8 control amplitude oil cylinder 5, realizes the pitching of beam mechanism 4 again; After the piston rod withdrawal of elevating ram 7, parallel four-bar linkage recovers retracted state, and the center of gravity of parallel four-bar linkage can improve riding stability at the rear of turn table support 1 at this moment.

Claims

1. arm support lifting mechanism, comprise turn table support, beam mechanism and amplitude oil cylinder, one end of amplitude oil cylinder is hinged on the beam mechanism, it is characterized in that: on the turn table support, be connected with the jib bearing by front arm and back arm, parallel four-bar linkage of the hinged successively formation of jib bearing and front arm, turn table support and back arm, be provided with elevating ram along its diagonal line in parallel four-bar linkage, the rear end of beam mechanism and the other end of amplitude oil cylinder are hinged on respectively on the jib bearing.

2. arm support lifting mechanism according to claim 1 is characterized in that: described elevating ram lower end is hinged on the jointed shaft between turn table support and the back arm.