CN1277736C

CN1277736C - Scissor fork type mechanical lifting gear

Info

Publication number: CN1277736C
Application number: CN 200410026066
Authority: CN
Inventors: 魏发孔
Original assignee: Lanzhou University of Technology
Current assignee: Lanzhou University of Technology
Priority date: 2004-04-08
Filing date: 2004-04-08
Publication date: 2006-10-04
Anticipated expiration: 2024-04-08
Also published as: CN1562725A

Abstract

The present invention relates to a shear fork type mechanical lifting device which is particularly suitable for lifting an orchestra pit or a stage. The lower end part of an inner bracket is provided with a lower travelling wheel which rolls on the upper track plane of a base component. The upper end of an outer bracket is provided with an upper travelling wheel which rolls on a lower track of an upper table beam component. Both ends of a horizontal pull frame are respectively sheathed on one side leaning the inner side of two lower travelling wheel shafts. A big screw rod approaches to one end of a driving unit and is supported by a UCP bearing. An energy storage spring in a spring energy storage device is sheathed on a telescopic upper guide tube and a telescopic lower guide tube. The top end of the spring energy storage device is provided with a bumper pad. Wire ropes are arranged in the upper guide tube and the lower guide tube according to the maximum work extension of the spring and are used for limiting rebound impact.

Description

A kind of scissor-type mechanical lifting gear

Technical field

The present invention relates to mechanical lifting gear, be specially adapted to the lifting of orchestra or stage.

Background technology

Aerial Work LT of the prior art has equipment from height, outstanding, the simple and reliable for structure characteristics of lifting travel amplification, be used on the lifting bay-lift structure of arenas lifting orchestra or elevator stage and other occasion the most fluid pressure drive devices that adopt of its type of drive more.Hydraulic-driven have bearing capacity big, be convenient to control, regulate and be easy to advantage such as overload protection.But need the long-time equipment of stopping after rising for table top,, hydraulic fluid leak occurs and phenomenon that stage is sunk because the hydraulic seal life-span is shorter.Moreover under the situation that does not allow pumping plant is isolated in the equipment fabricating yard, its noise ratio is bigger.

Aerial Work LT adopts the structure of Mechanical Driven horizontal screw bolt transmission in addition, because horizontal force is very big, when the initial angle of cutting fork and horizontal surface is 15 °, horizontal force is equivalent to nearly 4 times of vertical load power, along with reducing of angle at the beginning, horizontal force sharply increases by tangent cutve, makes its driving and drive mechanism become comparatively huge, efficient is very low, so can only be used for the little midget plant of load-carrying.

Summary of the invention

The scissor-type jacking system that the purpose of this invention is to provide a kind of new structure makes Aerial Work LT the sorrow of sinkage not occur in the long-time stop in optional position of rising, and reduces to drive and drive mechanism, reduces noise.

The present invention is a kind of scissor-type mechanical lifting gear, inner support (1) is hinged with middle bearing pin (12) with outer support (2), the upper end of inner support (1) is hinged by hinge pin (13) with the beam parts (7) of appearing on the stage, the bottom of outer support (2) and base member (3) are hinged with hinge pin (not indicating among the figure), travelling wheel (10) is equipped with down in the bottom that it is characterized in that inner support (1), on the face that gets on the right track of base member (3), roll, travelling wheel (10 ') is equipped with in the upper end of outer support (2), on the lower railway of beam parts (7) of appearing on the stage, roll, horizontal trying to stop people from fighting each other (4-7) two ends are enclosed within respectively and walk wheel shaft (a 9) side in the inner part under two, big screw rod (4-8) supports with UCP bearing (4-3) near an end of actuating unit (4-1), energy stroage spring (8-4) in the spring energy storage device (8) is sleeved on telescopic upper conduit (8-7) and the downtake (8-3), the top of spring energy storage device (8) is provided with cushion rubber (8-9), by the elongation of spring maximum functional steel rope (8-5) is housed in the last downtake, impacts in order to the restriction resilience.Upper conduit end plate (8-8) assembly welding is at an end of upper conduit (8-7), and downtake end plate (8-2) assembly welding is at an end of downtake (8-3), and last downtake bearing fit forms flexible.

The invention has the beneficial effects as follows: 1) horizontal screw bolt of helical angle reasonable in design make its efficiently transmission Aerial Work LT is stopped for a long time in the optional position of rising do not have; 2) design and installation of spring energy storage device is suitable for the very big big countertop fixture of bearing capacity, has overcome the too big problem of horizontal force, disposes rationally and make to drive with transmission; 3) select high precision worm type of reduction gearing and the big screw rod of processing through mill of high precision for use, noise of equipment is little; 4) key position of device drives and transmission is all taked Rational structure.

Description of drawings

Fig. 1 is an overall structure scheme drawing of the present invention, and Fig. 2 is the structure diagram of drive transmission part (4), and Fig. 3 is the structure diagram of spring energy storage device (8).

The specific embodiment

The present invention is further described below in conjunction with drawings and Examples.

To shown in the view, inner support (1) is hinged with middle bearing pin (12) with outer support (2) as Fig. 1 and C-C, is that double shear is pitched structure.To shown in the view, one in the outside is hinged with hinge pin (13) with appear on the stage beam parts (7) and base member (3) up and down as Fig. 1 and D-D, and travelling wheel (10 ') is equipped with in one of inboard.To shown in the view, the last travelling wheel (10 ') of using away wheel shaft (11) dress on the outer support (2) rolls on the lower railway of beam parts (7) of appearing on the stage as Fig. 1 and B-B.As Fig. 1 and A-A to shown in the view, inner support (1) rolls on base member (3) gets on the right track face with the following travelling wheel (10) of walking wheel shaft (9) dress down, horizontal trying to stop people from fighting each other (4-7) two is enclosed within respectively and walks in the inner part one of wheel shaft under two, when drive transmission part (4) drives, make inner support (1) motion by horizontal trying to stop people from fighting each other (4-7) horizontal drive, by cutting the fork structure jack-up beam parts (7) of appearing on the stage, thereby reach the purpose of Lifting platform.

As shown in Figure 1, bay-lift is when extreme lower position, compressed spring energy storage device (8) has maximum top power to the beam of appearing on the stage, this chien shih maximum horizontal propulsive effort is significantly cut down, along with table top rises, horizontal force progressively reduces, and the top power of spring energy storage device (8) also reduces, between suitably coupling make and drive and the transmission reasonable disposition.

The biplate platform is that left-right symmetric disposes said structure in pairs.

As shown in Figure 2, actuating unit (4-1) output shaft in the drive transmission part (4) is by fast coupling (4-2) and big screw rod (4-8) binding, transfer torque and speed, this sentences UCP bearing (4-3) and supports, (4-4) be bearing, big screw rod (4-8) must leave 1 mm clearance when axially installing, prevent hypertonic stress so that distortion.Shown in Fig. 2 and partial enlarged drawing A, the axially loaded of big screw rod (4-8) is located at the other end and supports, thrust force aligning bearing (4-12) is housed in bearing seat (4-16), and semi-ring (4-13) is stuck in the groove of big screw rod (4-8) head, and keeps a grip on radially with spacer (4-14).Thrust force aligning bearing (4-12) reaches pulling force can be subjected to heavily stressed bearing seat (4-16), but it disposes automatic compensation in pairs and resets.Is equipped with nut combinations (4-6) in the middle of horizontal the trying to stop people from fighting each other (4-7), nut combinations (4-6) is cast by high-strength cast steel, cover in the equipped tin bronze alloys of heat, in be with and the corresponding T shape screw thread of big screw rod (4-8).When table top in extreme lower position and load hour, the top power of possible spring energy storage device (8) is greater than vertical load, nut combinations this moment (4-6) will be subjected to set opposite power with conventional, so be provided with retaining cover plate (4-5), break away from the interior overcoat that prevents nut combinations (4-6).In whole equipment, the screw thread of big screw rod (4-8) and nut combinations (4-6) revolves in pairs about being.(4-9) being felt collar, (4-10) is front bearing cap, (4-11) is oil nozzle, (4-15) is rear bearing cover, (4-17) is support.

As shown in Figure 3, energy stroage spring (8-4) powerful in the spring energy storage device (8) is sleeved on telescopic upper conduit (8-7) and the downtake (8-3), by the elongation of spring maximum functional steel rope (8-5) is housed in the last downtake, and the restriction resilience is impacted.The top of spring energy storage device (8) is provided with cushion rubber (8-9), when preventing that table top from descending and its bump.Spring energy storage device (8) but extreme lower position by mechanical position limitation under the downtake load double as bay-lift.Upper conduit end plate (8-8) assembly welding is at one of upper conduit (8-7); Downtake end plate (8-2) assembly welding is at one of downtake (8-3), and last downtake bearing fit forms flexible.Spring energy storage device (8) lower set is equipped with mounting assembly (8-1), is convenient to fix on the base plate of base member (3) and can adjust squareness.

Claims

1, a kind of scissor-type mechanical lifting gear, inner support (1) is hinged with middle bearing pin (12) with outer support (2), the upper end of inner support (1) is hinged by hinge pin (13) with the beam parts (7) of appearing on the stage, the bottom of outer support (2) and base member (3) are hinged with hinge pin, travelling wheel (10) is equipped with down in the bottom that it is characterized in that inner support (1), on the face that gets on the right track of base member (3), roll, travelling wheel (10 ') is equipped with in the upper end of outer support (2), on the lower railway of beam parts (7) of appearing on the stage, roll, horizontal trying to stop people from fighting each other (4-7) two ends are enclosed within respectively and walk wheel shaft (a 9) side in the inner part under two, big screw rod (4-8) supports with UCP bearing (4-3) near an end of actuating unit (4-1), the output shaft of actuating unit (4-1) is by fast coupling (4-2) and big screw rod (4-8) binding, big screw rod (4-8) is connected with horizontal trying to stop people from fighting each other (4-7), energy stroage spring (8-4) in the spring energy storage device (8) is sleeved on telescopic upper conduit (8-7) and the downtake (8-3), the top of spring energy storage device (8) is provided with cushion rubber (8-9), by the elongation of spring maximum functional steel rope (8-5) is housed in the last downtake, impact in order to the restriction resilience, spring energy storage device (8) lower set is equipped with mounting assembly (8-1), is fixed on the base plate of base member (3).

2, a kind of scissor-type mechanical lifting gear according to claim 1, it is characterized in that the end of upper conduit end plate (8-8) assembly welding at upper conduit (8-7), downtake end plate (8-2) assembly welding is at an end of downtake (8-3), and last downtake bearing fit forms flexible.