CN2555200Y - Tail wheel lifter of walking tractor - Google Patents

Abstract

The utility model relates to a tail wheel lifter of a walking tractor, which mainly comprises a hydraulic cylinder, an outer sleeve, a fixing sleeve, a plunger rod, a connecting nut, an inner sleeve and a tail wheel yoke. The utility model adopts the hydraulic cylinder to control the lifting of the walking tractor, has convenient operation, simple structure and low manufacturing cost, and saves time and force. The utility model can be realized by making changes on the original hand operated lifting device of the walking tractor, thereby having better spreading and application prospect.

Description

Walker tractor tail wheel jacking system

The utility model relates to agricultural mechanical field, specifically is a kind of tail wheel jacking system of walker tractor.

The structure of screw rod lifting is all adopted in the lifting of walker tractor tail wheel at present, needs to reach with the manpower rotating screw bolt purpose of lifting tail wheel, wastes time and energy.

The purpose of this utility model is a kind of simple in structure, the compact jacking system that provides at the deficiency of above-mentioned existing walker tractor tail wheel up-down mode.

The implementation of the utility model purpose is: the walker tractor tail wheel jacking system that is provided is mainly by hydraulic cylinder, outer tube, fixed sleeving, plunger rod, the coupling nut, inner sleeve and tail wheel frame fork are formed, fixed sleeving is welded on the cultivated girder of seat of walker tractor, the fixed sleeving hypomere is slotted on tube wall vertically and is welded with clamping ring in the lower end, outer tube is enclosed within the fixed sleeving, lemon grips clamp bolt in the collar with the outer tube clamp fitting in the fixed sleeving, hydraulic cylinder is inserted in the outer tube from the upper end, be welded with flange on the hydraulic cylinder, the upper end of outer tube also is welded with flange, hydraulic cylinder and outer tube are fixed by bolted connection by flange, plunger rod is installed in the hydraulic cylinder, the lower end of plunger rod is processed with Acme thread, the lower end welding tail wheel frame fork of inner sleeve, tail wheel is installed in the tail wheel frame and sticks, the upper end of inner sleeve is welded with the coupling nut, inner sleeve is inserted in the outer tube and the coupling nut is screwed into the plunger rod lower end and is processed with the Acme thread part from the lower end, inner sleeve is connected with plunger rod by the coupling nut, the lower end of outer tube is with reinforcing pad, prevents to be out of shape when the outer tube lower end is subjected to the bigger application force of inner sleeve.During work, as needs rising walker tractor, the operation fluid control valve allows high pressure oil enter in the cylinder barrel from the oil inlet of hydraulic cylinder upper end, plunger rod is stressed to be stretched out downwards and promotes inner sleeve and move downward, walker tractor is enhanced, reach desired height after, the operation fluid control valve is closed high pressure oil input oil circuit, pressure oil in the cylinder barrel is in closed state, plunger rod two ends stress balance keeps stable, and trac. also highly keeps stable at this; When needing to reduce walker tractor, the operation fluid control valve connects the oil inlet of hydraulic cylinder upper end and low pressure oil circuit, the stressed lack of equilibrium in plunger rod two ends, under the effect of gravity, tail wheel is pressed into plunger rod in the hydraulic cylinder by inner sleeve, hydraulic oil flow oil sump tank in the cylinder barrel, walker tractor reduces, when reaching desired height, the operation fluid control valve is closed oil return line, and the hydraulic oil of plunger rod upper end is in closed state, the hydraulic fluid pressure of plunger rod upper end will be raise, when the power that is subjected to up and down when plunger rod equated, plunger rod was in new state of equilibrium again, and trac. also highly keeps stable at this; When plunger rod arrives the high-low limit position still the out of reach desired height requires, can unclamp clamping ring on the fixed sleeving and move up and down outer tube and change clamped position and realize; In the time of need turning to, rotate tail wheel frame fork, because the nut of inner sleeve upper end is connected for pine with the screw rod of plunger rod lower end, inner sleeve and plunger rod relatively rotate, and plunger rod does not rotate.

This walker tractor tail wheel jacking system adopts the lifting of hydraulic ram control walker tractor, easy to operate, time saving and energy saving, simple in structure, low cost of manufacture, also can on the basis of the original manual hoisting device of walker tractor, realize having popularizing application prospect preferably through less change.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the structural representation of the utility model walker tractor tail wheel jacking system.As shown in Figure 1, walker tractor tail wheel jacking system mainly is made up of hydraulic cylinder (1), outer tube (5), fixed sleeving (6), clamping ring (15), plunger rod (8), coupling nut (9), inner sleeve (10), reinforcing pad (11) and tail wheel frame fork (13).Fixed sleeving (6) is welded on the cultivated girder of seat (7) of walker tractor, fixed sleeving (6) hypomere is fluting and be welded with clamping ring (15) in the lower end on tube wall vertically, outer tube (5) is inserted in the fixed sleeving (6), the clamp bolt (16) that lemon grips in the collar (15) can be with outer tube (5) clamp fitting in the fixed sleeving (6), hydraulic cylinder (1) is inserted in the outer tube (5) from the upper end, hydraulic cylinder (1) outside weld is connected to flange (3), the upper end of outer tube (5) is welded with flange (4), hydraulic cylinder (1) is captiveed joint by bolt group (2) with flange (4) by flange (3) with outer tube (5), plunger rod (8) is installed in the hydraulic cylinder (1), the lower end of plunger rod (8) is processed with Acme thread, the lower end welding tail wheel frame fork (13) of inner sleeve (10), tail wheel (12) is installed on the tail wheel frame fork (13), the upper end of inner sleeve (10) is welded with coupling nut (9), inner sleeve (10) is inserted in the outer tube (5) from the lower end, coupling nut (9) on the inner sleeve (10) is screwed into plunger rod (8) lower end is processed with the screw thread place, nut (9) is loose being threaded with plunger rod (8), when walker tractor turns to, inner sleeve (10) rotates, plunger rod (8) does not rotate, high pressure oil is when the oil inlet (17) of hydraulic cylinder (1) upper end enters in the cylinder barrel, plunger rod (8) is pushed out oil cylinder and moves down, walker tractor is raised, otherwise, when reducing the oil pressure of plunger rod (8) upper end, plunger rod (8) is pushed into oil cylinder and moves up, and walker tractor reduces.The lower end of outer tube (5) is with reinforcing pad (11), in order to avoid outer tube (5) lower end is out of shape when being subjected to the bigger application force of inner sleeve (10), reinforcing pad (11) is fixed on the outer tube (5) by screw (14).

Claims (2)

1. walker tractor tail wheel jacking system, comprise hydraulic cylinder (1), outer tube (5), fixed sleeving (6), plunger rod (8), coupling nut (9), inner sleeve (10), it is characterized in that fixed sleeving (6) is welded on the cultivated girder of seat (7) of walker tractor, fixed sleeving (6) hypomere is fluting and be welded with clamping ring (15) in the lower end on tube wall vertically, outer tube (5) is inserted in the fixed sleeving (6) and by clamping ring (15) clamp fitting, hydraulic cylinder (1) is inserted in the outer tube (5) from the upper end, hydraulic cylinder (1) outside weld is connected to flange (3), the upper end of outer tube (5) is welded with flange (4), hydraulic cylinder (1) and outer tube (5) are connected and fixed by bolt group (2) by flange (3) and flange (4), plunger rod (8) is installed in the hydraulic cylinder (1), the lower end of plunger rod (8) is processed with Acme thread, inner sleeve (10) is inserted in the outer tube (5) from the lower end, the lower end welding tail wheel frame fork (13) of inner sleeve (10), the upper end of inner sleeve (10) is welded with coupling nut (9), and inner sleeve (10) is connected with plunger rod (8) by coupling nut (9).

2, walker tractor tail wheel jacking system according to claim 1 is characterized in that the lower end of outer tube (5) is with reinforcing pad (11), and reinforcing pad (11) is fixed on the outer tube (5) by screw (14).