CN2299189Y

CN2299189Y - Driving mechanism of rotary cutter driven by air cylinder

Info

Publication number: CN2299189Y
Application number: CN 96245707
Authority: CN
Inventors: 赵子辉
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-11-05
Filing date: 1996-11-05
Publication date: 1998-12-02
Anticipated expiration: 2006-11-05

Abstract

The utility model relates to a driving mechanism for driving a rotary cutter by an air cylinder. A crank which is fixed on a cutter rotating shaft is hinged with a connecting rod; the other end of the connecting rod is provided with two pin shafts; one pin shaft is used for hinging an end joint of a piston rod of an air cylinder; the other pin shaft is used for hinging a rocking rod; the other end of the rocking rod is hinged on a frame connecting shaft. A return spring is led out from the upper part of the rocking rod. The counter force of the return spring is applied to the torque of the connecting rod by the rocking rod to make the connecting rod of the crank pass through two dead points in the rotating cycle of the connecting rod of the crank. The utility model has the advantages of simple structure, low cost, and the higher linear speed of the cutter, and has the advantage that the application range of cold cutting can be enlarged.

Description

The driving mechanism of air cylinder driven rotary cutter

The utility model relates to a kind of mechanical linkage, especially cuts off the driving mechanism that the rotary cutter of extruding pipe adopts air cylinder driven in the plastic molding equipment.

Known air cylinder driven rotary cutter can intermittently rotate along a direction for making cutting knife, need have a straight line motion with cylinder piston to be transformed to the conversion stage that the cutting knife rotating shaft rotatablely moves.In existing rotary cutter, what this conversion stage adopted is the type of belt drive of rack pinion or crank block.During with the rack pinion form, when need being set, the tooth bar return, when adopting the crank block form,, need be arranged on the offset mechanism of this two places pushing crank in addition in order to tide over two dead center positions of crank-connecting rod for the clutch mechanism or the changement of cutting knife rotating shaft.By as seen above-mentioned, existing rotary cutter driving mechanism is all complicated, and because of space between cutting knife rotating shaft and the plastic extruder head limited, make at cutting knife rotating shaft place on-line equipment conversion stage and have any problem, in some mechanisms, other establishes gear stage in the middle of, and is so that conversion stage moves apart the plastic extruder head is far away, like this then increased the complexity and the cost of production of mechanism.

The purpose of this utility model is complicated at the driving mechanism of existing air cylinder driven rotary cutter, and the shortcoming that cost is higher provides a kind of driving mechanism that is only got final product real cutting knife motion by crankrocker mechanism.

The purpose of this utility model is achieved in that the crank that is fixedly connected in the cutting knife rotating shaft, the moved end of crank and connecting rod are hinged, the other end of connecting rod is provided with the bearing pin that two centre distance are equal to or slightly less than crank length, the tailpiece of the piston rod joint of the cylinder that is used for being hinged, another is used for the rocking bar that is hinged, the other end of rocking bar is hinged on the frame linking axle, draws a return spring from rocking bar, makes rocking bar be subjected to the counter-force maximum of spring at pivot angle two stop places.In the work, when piston rod spurs connecting rod to stop, make crank stop at a dead point slightly on the Qian Chu home position, this moment, return spring gave connecting rod a contra solem moment through rocking bar, when piston rod from draw the process that becomes release, this moment cranking lever rotates along clockwise and crosses the dead point, then makes the crank quick rotation by piston rod thrust, and cutting knife screws out and cuts off and mould pipe.When piston rod promotes connecting rod to stop, crank stops at the preceding slightly place at another dead point, this moment, rocking bar gave connecting rod a suitable clockwise moment, when piston rod from push away the process that becomes pulling, this moment cranking lever rotates along clockwise, then make the crank quick rotation, stop at the home position after taking up the back lash, thereby finish the motion in a week by the piston rod pulling force.

Owing to adopt such scheme, there is higher linear velocity in the stage casing that cutting knife screws out stroke, can chop off at a gallop and mould pipe, some need be chopped off with the also available cryoprobe of pipe of moulding that hot cutter cuts off originally, can reduce the energy consumption of electric heating cutting knife, simultaneously, owing to take up room less in cutting knife rotating shaft place during link motion, can not conflict with cross-head, gear stage in the middle of therefore can removing from makes driving mechanism more simple and reliable.

Below in conjunction with drawings and Examples the utility model is further specified.

Among the figure 1, cutting knife rotating shaft 2, rocking bar 3,14, frame linking axle 4, spring strike out 5, return spring 6, cylinder 7, crank 8,10,11, hinge bearing pin 9, connecting rod 12, tailpiece of the piston rod joint 13, frame 15, cutting knife

Among the figure, cutting knife rotating shaft (1) is arranged in the bearing support that is fixedly connected with frame (13), its upper and lower end be fixedly connected respectively crank (7) and cutting knife (15), by bearing pin (8) hinge crank (7) and connecting rod (9), connecting rod (9) is hinged by bearing pin (11) and (10) respectively with tailpiece of the piston rod joint (12) and rocking bar (2), rocking bar (2) is hinged by frame linking axle (3) and frame (13), strike out (4) by the spring on the rocking bar (2) and tangle a return spring (5), the tail end that drives cylinder (6) is hinged on frame (13) by pin (14).

Except that above-mentioned driving mechanism, in the cutting knife rotating shaft (1) below frame (13), also be provided with the introducing slip ring of cutting knife heating power supply and be fixed on the following brush of frame (13) partly (not drawing among the figure).

The selection of return spring should note making its minimum load to go to zero, and it is little that the mechanism of its maximum load after for break-in also should try one's best, if select for use excessively, will increase the impact shock of mechanism.

Claims

1, a kind of driving mechanism of air cylinder driven rotary cutter, a crank is fixedly connected in the cutting knife rotating shaft, its moved end and a connecting rod are hinged, it is characterized in that: the other end of connecting rod is provided with two bearing pins, the cylinder piston rod end connector that is used for being hinged, another is used for the rocking bar that is hinged, and the other end of rocking bar is hinged on the frame linking axle, draws a return spring from rocking bar.

2, the driving mechanism of air cylinder driven rotary cutter according to claim 1, the return spring that it is characterized in that rocking bar are two stage clips, and they are located at respectively on the frame in the outside, rocking bar pivot angle two stop places, make rocking bar compression retracteding position spring when the convergence dead-centre position.