CN201352065Y

CN201352065Y - Spring flexible pressing device

Info

Publication number: CN201352065Y
Application number: CNU2009200631605U
Authority: CN
Inventors: 甘伟; 唐穗良; 张亚军
Original assignee: Zhuzhou Cemented Carbide Group Co Ltd
Current assignee: Zhuzhou Cemented Carbide Group Co Ltd
Priority date: 2009-02-10
Filing date: 2009-02-10
Publication date: 2009-11-25
Anticipated expiration: 2019-02-10

Abstract

The utility model discloses a spring flexible pressing device, comprising a joining sleeve fixed on a furnace cover of a vacuum sintering furnace, a supporting bracket fixed on the joining sleeve, four guide screw stems which are used for axial movement of an air cylinder and for fixing the air cylinder on the supporting bracket, and an air cylinder of which the front end is stretched into the furnace body by freely penetrating through a central through hole of the joining sleeve for supporting against a graphite door, and the air cylinder is axially connected; the spring flexible pressing device further comprises a spring base located on the supporting bracket and a spring placed in the spring base, and a lug boss adjusting guide pad and a lug boss shaped guide pad, the protruding parts of which are respectively clamped in the spring from the two ends of the spring, and an adjusting screw stem which is rotated in from the central screwed hole on the bottom surface of the spring base and is supported against the bottom surface of the lug boss of the adjusting guide pad, and the bottom surface of the lug boss of the guide pad is tightly attached to the rear end surface of the air cylinder which can make axial reciprocating movement along the guide screw stems. The spring flexible pressing device has the advantages that the device can lead the sealing of the graphite door and a graphite case to be positioned in a moving flexible tightly-sealing state, so as to improve the using efficiency of the vacuum sintering furnace and reduce maintaining cost.

Description

The flexible hold down gag of spring

Technical field

The utility model relates to a kind of spring attachment, especially a kind of spring attachment that is used for graphite door sealing in the vacuum sintering furnace stove.

Background technology

All be provided with a graphite railway carriage or compartment in the existing vacuum sintering furnace, workpiece to be sintered is placed in the graphite railway carriage or compartment, and the two ends in graphite railway carriage or compartment are sealed and sealed with a graphite door respectively.The sealing of graphite door generally is to adopt to be fixed on the bell, to be realized by the roof pressure of the combined cylinders piston rod of two cylinders serial connections.When the graphite door is in the high sealing state, because the high temperature during sintering, the graphite railway carriage or compartment produces high temperature heat expansion effect, apply very big expansive force to graphite door direction, and sealing is stablized constant with the roof pressure power that cylinder provides, therefore, the graphite door very easily ruptures under cylinder top pressure and relative graphite railway carriage or compartment expansive force double reaction plus.If slightly reduce the roof pressure power of cylinder to the graphite door, make the graphite door be in " under the loose state " sealing, though the probability of graphite door fracture decreases, but easily cause sealing effectiveness bad, binder in the sintering workpiece evaporate into and produces corrosion in heat-insulation layer outside inboard wall of furnace body, the graphite railway carriage or compartment and the vacuum system, cause the damage and the pumping fluid of these parts to change frequently, thereby make capacity utilization not high, maintenance difficulty strengthens.

Summary of the invention

The purpose of this utility model is the technical problem that exists when above-mentioned vacuum sintering furnace graphite door adopts cylinder top pressure to compress sealing in order to overcome, provide a kind of spring flexible hold down gag, it is the flexible hold down gag of a newly-increased sleeve spring in original hold down gag, make the thermal expansion force in graphite railway carriage or compartment convert the flexible force of spring to, realize the dynamic flexible tightening seal of graphite door.

The technical solution adopted in the utility model is for achieving the above object:

The mode that the flexible hold down gag of this spring still adopts the cylinder of prior art to compress to pass the coupling sleeve central through hole that is fixed on the bell to stretch into the axle that promotes the graphite door in the body of heater to the roof pressure sealing of graphite door seals, bearing support is fixedly mounted on the coupling sleeve, and reality just is fixed on the bell.The front end of cylinder stretches into the axle that promotes the graphite door in the body of heater with the central through hole that passes coupling sleeve and links, and floating support is on coupling sleeve, and this axle can move back and forth in central through hole, also just can drive cylinder and axially move back and forth.Cylinder block is positioned on the bearing support by 4 guide spiro rods, and is different from being fixed on the bearing support of prior art, and like this, cylinder just can axially move back and forth along guide spiro rod.Simultaneously, on existing bearing support, increase the rear end face that the flexible hold down gag of a sleeve spring compresses cylinder is installed, the flexible hold down gag of this spring comprises that the axial roof pressure that relies on cylinder defeats tightly and be positioned at the spring base on the bearing support, be placed in the spring in the spring base, boss shape adjustment guiding pad and boss shape guiding pad, the projection of adjusting guiding pad and guiding pad snaps in the spring from the two ends of spring respectively, adjust screw rod and from spring base bottom center screw, screw in and withstand the boss bottom surface of adjusting the guiding pad, can be pressed on along the cylinder rear end face that guide spiro rod does axially to move back and forth on the boss bottom surface of guiding pad.Like this, screw the adjustment screw rod, the thermal expansion force that the graphite door bears just can be passed spring and compress spring by cylinder, guiding dig pass, thereby thermal expansion force is converted to the elastic force (flexible force) of spring.

The utility model is when implementing, if the hold down gag of pyrometallurgy stove is a combined cylinders, then the end face with the combined cylinders front air cylinder links with the axle that withstands the graphite door; If the hold down gag of pyrometallurgy stove is single cylinder, then the front end piston rod with single cylinder links with the axle that withstands the graphite door, and the flexible hold down gag of this spring all is the rear end face installation of being close to cylinder.

The utility model has the advantages that the vacuum sintering furnace graphite door hold down gag that increases behind the flexible hold down gag of spring realized that rigidity power and flexible force combine, under the hot conditions of sintering, the rigidity heat expansion power on the graphite door of acting on has converted the flexible force of spring to, the sealing in graphite door and graphite railway carriage or compartment is in a dynamic flexible tightening seal state all the time, the effect of sealing has reached, and the graphite door can not be damaged yet.The utility model is simple in structure, and is safe and reliable, improves the utilization rate of vacuum sintering furnace after installing and using greatly, reduces maintenance cost.

Description of drawings

Fig. 1 is the installation site schematic diagram of the flexible hold down gag (A) of the utility model spring on the vacuum-sintering furnace body;

Fig. 2 is the structural representation of the flexible hold down gag of the utility model spring (A).

The specific embodiment:

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

The flexible hold down gag of the spring of present embodiment (A) is used for the 500Kg vacuum sintering furnace, in the hold down gag that this sintering furnace now adopts, cylinder 6 (is made up of the joining cylinder of pair of pistons bar rod end the combined cylinders that two cylinder serial connections form, or the two cylinders of title) (as shown in Figure 1), the front air cylinder front end of cylinder 6 links with the axle 13 that promotes the graphite door, and floating is positioned on the coupling sleeve 11.Axle 13 central through holes that pass coupling sleeve 11 of this promotion graphite door stretch into and withstand graphite door 9 in the body of heater, and graphite door 9 roof pressures on graphite railway carriage or compartment 10, are realized tight seal; Axle 13 can be free to slide front and back in the central through hole of coupling sleeve 11.Coupling sleeve 11 is fixed on the bell 8.The exhaust casing of cylinder 6 is located and is fixed on the bearing support 7 by 4 guide spiro rods 12.Bearing support 7 is linked by screw rod by two support plates in the front and back that are parallel to each other and constitutes, and bearing support 7 wears and is fixed on the coupling sleeve 11 by the center hole on the support plate before it, finally also is to be fixed on the bell 8.

The flexible hold down gag A of the utility model spring that increases newly is pressed on the rear end face of exhaust casing in the combination cylinder 6, and it comprises spring 1, adjusts guiding pad 2, adjusts screw rod 3, spring base 4 and guiding pad 5.Spring base 4 is like round cup shape, and the cup end laterally is placed in the center hole on the bearing support 7 back support plates outwardly, relies on the thrust of exhaust casing that its " rim of a cup flange " is pressed on the back support plate of bearing support 7 on the positioning step in the center hole tightly.Be processed with in " cup bottom surface " centre bore of spring base 4 and adjust the internal thread that screw rod 3 cooperates, spring 1 is placed in the spring base 4, adjusting guiding pad 2 all is boss shape with guiding pad 5, the internal diameter of their projection diameter and spring 1 is suitable, just in time snap in and realize the location in the spring 1, their base frame section diameter is more smaller than the internal diameter of spring base 4, can freely come and go in spring base 4 behind the spring base 4 of packing into and slide.The projection of adjusting guiding pad 2 and guiding pad 5 snaps in the spring from the two ends of spring 1 respectively, adjust the boss bottom surface of guiding pad 2 and be close to the rod end of adjusting screw rod 3, the rear end face of cylinder 6 exhaust casings is close in the boss bottom surface of guiding pad 5, and by cylinder 6 tightly roof pressure.Adjust screw rod 3 and screw in from the center screw of spring base 4 bottom surfaces in the spring base 4, its rod end withstands the boss bottom surface of adjusting guiding pad 2.

After increasing the flexible hold down gag A of spring of the present utility model (respectively increasing by a cover on the clamping cylinder 6 of two ends graphite door 9) on the vacuum sintering furnace shown in Figure 1, change the mounting means of original cylinder, the exhaust casing that is cylinder 6 only is positioned on the bearing support 7 by 4 guide spiro rods 12, no longer be fixed on the bearing support 7, but the rear end face that makes this exhaust casing is pressed on the boss bottom surface of guiding pad 5 of the present utility model, makes cylinder 6 axially do moving back and forth of certain distance at it along guide spiro rod 12.Be rotated in place as long as will adjust screw rod 3 by manufacturing technique requirent, when the expanded by heating of graphite railway carriage or compartment, expansive force passes to guiding pad 5 by graphite door 9 and cylinder 6, pass to spring 1 again and compress spring, the elastic force (flexible force) of spring 1 and the dynamic equilibrium of the heat expansion power in graphite railway carriage or compartment 10 have so just been realized, graphite door 9 is under the cylinder 6 constant pressure roof pressures all the time, reaches the sealing effectiveness of technological requirement, can not produce fracture again.

The flexible hold down gag of spring of the present utility model also can use on the pyrometallurgy stove that utilizes cylinder top pressure that fire door is sealed of other kind, no matter clamping cylinder is single cylinder, perhaps is combined cylinders, and its mode of installing and using is identical.When just clamping cylinder is single cylinder, be that the front end piston rod with cylinder 6 is connected on the axle 13 that promotes the graphite door.

Claims

1. the flexible hold down gag of a spring, comprise the coupling sleeve (11) that is fixed on the vacuum sintering furnace bell (8), be fixed on the bearing support (7) on the coupling sleeve (11), what be used for cylinder (6) moves axially and is located 4 guide spiro rods (12) on bearing support (7), the axle (13) that stretches into promotion graphite door (9) in the body of heater that passes coupling sleeve (11) central through hole and can in this through hole, move back and forth, front end and axle (13) joining cylinder (6), it is characterized in that it also comprises the spring base (4) that is positioned on the bearing support (7), be placed in the spring (1) in the spring base (4), boss shape adjustment guiding pad (2) and boss shape guiding that their projection snaps in from the two ends of spring (1) respectively the spring (1) are filled up (5), screw in and withstand the adjustment screw rod (3) of adjusting guiding pad (2) boss bottom surface from spring base (4) bottom center screw, the boss bottom surface of guiding pad (5) is close on cylinder (6) rear end face that can do axially to move back and forth along guide spiro rod (12).

2. the flexible hold down gag of spring according to claim 1 is characterized in that described cylinder (6) is the front end face and axle (13) joining combined cylinders of front air cylinder, or the front end piston rod of cylinder and axle (13) joining single cylinder.