CN1206066C - Powder metallurgy static mould wall lubricating device - Google Patents

Abstract

The present invention provides an electrostatic mould-wall lubricating device for powder metallurgy, which is characterized in that the electrostatic mould-wall lubricating device is composed of a common compressed air source, a high voltage electrostatic generator (1), an airflow control system (2), a powder storing device, a powder spraying system, a powder storing cylindrical cabinet (3), a powder conveying hose (7), a circulating hose (8) and a powder spraying hose (9), wherein interfaces are connected by the hoses. The present invention has the advantage that a corona discharging mode is an innovative point of the novel electrostatic mould-wall lubricating device. The corona discharge can make any lubricating powder carry electrostatic charges, the selection of a lubricant has larger flexibility, and the charge carrying quantity of the lubricating powder can be controlled better. The maintenance is convenient, and the powder discharging quantity of the lubricating powder can be controlled better. The electrostatic mould-wall lubricating device is suitable for the electrostatic mould-wall lubrication of powder metallurgy, and can also be used for the lubrication of other devices in the fields of metal processing and new materials.

Description

A kind of powder metallurgy electrostatic die wall lubrication device

Technical field

The invention belongs to powder metallurgical technology, a kind of powder metallurgy electrostatic die wall lubrication device particularly is provided, be applicable to the lubricated of powder metallurgy static die wall, also can be used for the lubricated of metal processing and other utensils of field of new.

Background technology

PM technique is by mixing the parts machining process of powder, precise press molding and sintering.It can the implementation structure part especially the nearly end form of iron-based and sintering base steel part be shaped, reduce a large amount of machining operations, reduce production costs.Thereby powder metallurgy structural parts is widely used in industries such as automobile, machinery, instrument, household electrical appliance, food processing facility.Constantly reduce the processing cost of relevant industries.

But the powder metallurgy structural parts organization internal always contains a certain amount of residual porosity.These residual porosity can reduce the intensity of part.Powder metallurgical technique constantly develops, and tries hard to improve in the precise press molding stage green density of part.1994, in the powder metallurgy international conference that Toronto is held, (document has: Rutz H G to have proposed the warm-pressing technology technology, Harejjo F G, Luk S H. " Warm Compactioon Offers HighDensity at Low Cost " .MPR, 1994,49 (9): 40-47; Musella V and D ' angelo M. " Process for Preheating Metal in Preparation for Compacting Operations " .US Patent, No.4,955,798; Chagono F, Gelinas C and Trudel Y. " Development of High DensityMaterials for PM Applications " .Advances in Powder Metallurgy and ParticulateMaterials, 1994, vol.3.Edited by Lall C and Newpaver A J.MPIF, Princeton, N.J., 1994:199).Wherein mainly be to select can be at 100～150 ℃ of normal high-temperature lubricants that use in the preparation of premixed powder.And under 100～150 ℃, suppress.This technology has not only improved 0.1～0.25g/cm with the iron-based green density ³, improved green strength greatly, make press density of iron powder reach 7.5g/cm ³, and the pressing pressure of this technology and knockout press, in low pressing pressure scope (500～700MPa), all low than the prior powder metallurgy method, improved die life, reduced cost.

The shortcoming that warm-pressing technology exists is that when using higher pressing pressure for obtaining higher green density, the lubricated of die wall just seems not enough.In recent years, the electrostatic die wall lubrication technology has obtained development faster, and is on the books in following document: Mongeon, Pelletier, Sylvain.Die wall lubrication method andapparatus.Canadian Patent, 01/36132.2001-05-25; Pelletier Sylvain, ZianiAbdelouahab, Mongeon Paulemile.Die wall lubrication method and apparatus.American Patent, US6299690.2001-10-09; K.Dastoori, B.Makin.Adhesion measur-ements for electrostatic powder coatings using drop test rig and virtual oscilloscope.Journal of Electrostatics, 2001,51-52:509-514..Its operation principle is: utilize a covering device to make electrostatic charge on the powdered lubricant band, charged powdered lubricant be injected in the mould inner wall of ground connection on thereafter, because the effect of Electrostatic Absorption power, charged powdered lubricant can be on mould inner wall continuous, formed a thin lubricated bisque uniformly, in pressing process, the lubricated bisque of this layer also plays the effect that reduces frictional force between metal powder and mould inner wall.If the die wall lubrication technology is combined with the temperature and pressure technology, the density of powder compact can improve a lot under high pressing pressure.

Similar electrostatic die wall lubrication device has abroad appearred, its operation principle is to use special-purpose friction rifle, make static on the powdered lubricant band by friction mode, be specially: powdered lubricant is sent in the defeated powder flexible pipe of multiple aperture by blast, in this course, owing to static is with in friction and each intergranular mutual collision of powdered lubricant and defeated powder flexible pipe, powdered lubricant sprays in die cavity by nozzle then, is adsorbed on the inwall of die cavity by the effect of Electrostatic Absorption power.Thereby forming one deck on mould intracavity wall approaches and uniform powdered lubricant.Yet there are following shortcoming in this operation principle and device:

1, there is limitation in the selection of powdered lubricant.Since powdered lubricant adopt with the mode band of failing the friction of powder flexible pipe on static, the material of defeated powder flexible pipe is certain, this certainly will propose stricter requirement to powdered lubricant.Because, after this defeated powder flexible pipe friction, powdered lubricant is wanted to produce enough electrostatic charge quantities, in the electrostatic table, its position will be good away from the material of defeated powder flexible pipe then, the selection that this has limited powdered lubricant greatly, the powdered lubricant that tends to have better lubricant effect but can not be used by this device.This is the most fatal shortcoming for electrostatic die wall lubrication.

The unstability of 2, dusting.Owing to adopt the defeated powder of the defeated powder flexible pipe of multiple aperture, after repeatedly using, will in flexible pipe, deposit powdered lubricant, and utmost point easy to clean not, this will influence the service life of defeated powder flexible pipe and the amount of dusting of this device greatly, thereby influence the lubricant effect of die wall.

3, static content is wayward.Powdered lubricant charge-mass ratio (charge-mass ratio: the electrostatic belt electric weight of powdered lubricant and the ratio of its quality) value has great influence to the adsorbance and the spraying effect of powdered lubricant on die wall.Since be the triboelectrification mode that adopts the defeated powder flexible pipe of multiple aperture, how many then difficult controls of powdered lubricant carried charge.

4, owing to there is not the recovery problem of peripheral passage and powdered lubricant, this device is bigger to environment and operator's pollution.The cost height, because defeated powder flexible pipe is the friction rifle of multiple aperture, this has increased the cost of this device greatly.

Summary of the invention

The objective of the invention is to: provide a kind of powder metallurgy electrostatic die wall lubrication device, to reduce cost, to satisfy requirements of large-scale production.

" the novel electrostatic die wall lubrication device " of the present invention's design, by universal compressed air source of the gas and HV generator (1), jet system (2), hold the powder device, hold powder tube cabinet (3), powder spraying system, defeated powder flexible pipe (7), loop hose (8), the flexible pipe that dusts (9) form, each interface is continuous by flexible pipe.Its structure is seen Fig. 1.

The novel electrostatic lubricating arrangement mainly is that the mode by corona discharge makes static on the powdered lubricant band, and is more flexible to selection of lubricants like this, and the powdered lubricant carried charge what can more be controlled.This device except that universal compressed air source of the gas, by HV generator, jet system, hold the powder device, powder spraying system four parts are formed.

HV generator

HV generator 1 offers the interior shower nozzle (seeing Fig. 6-a, Fig. 6-b or Fig. 7-a, 7-b) of mould boots (seeing Figure 11) with high voltage, make the corona guns 37 in the shower nozzle produce corona field, emit electric charge and make ambient air ionization, powdered lubricant will be with electric charge during by corona field.

Jet system

Four air pressure of jet system (see figure 2) control are respectively:: blow powder blast 24, cylinder blast 25, a blast 26 and a secondary blast 27.The total air flow 10 of one drying at first is provided by compressed air gas source, and total air flow 10 is divided into four branch's air-flows then, is called: blow powder blast 24, cylinder blast 25, a blast 26 and a secondary blast 27.Magnetic valve 11 and choke valve 17 are controlled the break-make and the throughput size of blowing powder blast 24 respectively, and powder blast 24 air flow value are blown in flowmeter 21 demonstrations; Magnetic valve 12 and choke valve 16,18 are controlled the break-make and the throughput size of cylinder blast 25 respectively, and the airflow-reversing of reversal valve 15 control cylinder blast 25 can freely stretch cylinder; Magnetic valve 13 and choke valve 19 are controlled the break-make and the throughput size of a blast 26 respectively, and flowmeter 22 shows blast 26 air flow value; Magnetic valve 14 and choke valve 20 are controlled the break-make and the throughput size of secondary blast 27 respectively, and flowmeter 23 shows secondary blast 27 air flow value.Blowing powder blast 24 provides air-flow to holding powder device (see figure 3), and air-flow is entered by the powder blast interface 28 that blows that holds powder tube 31, thereby makes the powdered lubricant on the thermopnore 32 be fluidized state; A blast 26 mainly is to make isocon 29 and draw between the tube cell 30 to produce draught head, in the effect of draught head, the powdered lubricant of boiling is thus lifted in the isocon 29; Secondary blast 27 makes the powdered lubricant that is trapped in the isocon 29 that suspends send along defeated powder flexible pipe 7; Cylinder blast 25 mainly is to provide power for cylinder 4.

Hold the powder device

Holding powder device (see figure 3) is made up of four parts: isocon 29, draw tube cell 30, hold powder tube 31 and fluid bed 32.Powdered lubricant is put on the fluid bed 32 that holds powder tube 31, blows powder blast 24 and is entered by the powder blast interface 28 that blows of fluid bed 32 bottoms, makes the powdered lubricant boiling; The horn mouth that draws tube cell 30 places on the powdered lubricant face, the absorption of this powdered lubricant that helps seething with excitement, and the powdered lubricant of ejection is vaporific; There are four interfaces in isocon 29: defeated powder flexible pipe one interface 33, blast interface 34, a secondary blast interface 35 and draw tube cell interface 36.Wherein defeated powder flexible pipe one interface 33 links to each other with defeated powder flexible pipe 7, and one time blast interface 34 links to each other with a blast 26, and secondary blast interface 35 links to each other with secondary blast 27, draws tube cell interface 36 and draws tube cell 30 and link to each other.

Powder spraying system

Powder spraying system is made up of five parts: shower nozzle (is seen Fig. 6-a, Fig. 6-b or Fig. 7-a, Fig. 7-b), triple valve (see figure 8), mould boots (seeing Figure 11), cylinder 4, guide plate 5.Wherein, (see Fig. 6-a, Fig. 6-b or Fig. 7-a, Fig. 7-b) be positioned in the mould boots (seeing Figure 11) with the triple valve (see figure 8), three's shower nozzle is integrated.Cylinder interface 49 on the mould boots (seeing Figure 11) links to each other with cylinder 4, and its operation subject cylinder 4 is controlled, and cylinder 4 is fixedly put on the guide plate 5.Shower nozzle (is seen Fig. 6-a, Fig. 6-b or Fig. 7-a, Fig. 7-b) be made up of two parts: corona guns 37 and spout 38.Shower nozzle (see Fig. 6-a, Fig. 6-b or Fig. 7-a, Fig. 7-b) top links to each other with flexible pipe two interfaces 48 that dust, shower nozzle (see among Fig. 6-a, Fig. 6-b or Fig. 7-a, Fig. 7-b) that corona guns 37 and HV generator 1 link to each other with lead, (see and be the spout 38 of each shape bottom Fig. 6-a, Fig. 6-b or Fig. 7-a, Fig. 7-b) by shower nozzle.Shower nozzle has two types: spray shower nozzle in top (sees that Fig. 6-a, Fig. 6-b) and side spray shower nozzle (see Fig. 7-a, Fig. 7-b).(see Fig. 6-a, Fig. 6-b) vertically place on the die cavity face, powdered lubricant is adsorbed on the die cavity wall under the effect of air pressure top spray shower nozzle from top to bottom; Side spray shower nozzle (see Fig. 7-a, Fig. 7-b) be shower nozzle to stretch in the die cavity, powdered lubricant under the effect of air pressure by the spout on the shower nozzle wall 38 toward around spray and be adsorbed on the die cavity wall.The triple valve (see figure 8) mainly is made up of reversing bar 39, distance rod 42, sleeve 44 and spring four parts.Spring places in the sleeve 44 with the opposite end of defeated powder flexible pipe two interfaces 45 of reversing bar 39 and links to each other, and it is as the commutate effect of restoring forces of reversing bar 39.

Apparatus of the present invention operation principle:

HV generator 1 is opened, and makes the shower nozzle in the mould boots 6 (see that Fig. 6-a, Fig. 6-b or Fig. 7-a, Fig. 7-b) interior corona guns 37 produce corona fields and emit electrostatic charge.Simultaneously, compressed air gas source provides total air flow 10 for jet system 2, magnetic valve 11, magnetic valve 12, magnetic valve 13, magnetic valve 14 are opened at this moment, make to produce four air-flows in this system, regulate choke valve 16, choke valve 17, choke valve 18, choke valve 19, choke valve 20 to obtain each required throughput.At this moment, blowing powder blast 24 acts on and holds holding in the powder device (see figure 3) in the powder tube cabinet 2, make the powdered lubricant that holds in the powder tube 31 be the boiling attitude, one time blast 26 acts in the isocon 29, make isocon 29 and draw 30 of tube cells and produce draught head, thereby the powdered lubricant that is in the boiling attitude is entered in the isocon 29 by drawing tube cell 30, and under the effect of secondary blast 27, powdered lubricant is carried along defeated powder flexible pipe 7 again.Simultaneously, under the effect of cylinder blast 25, cylinder 4 promotes mould boots 6 and moves along the track on the guide plate 5, the shower nozzle of cylinder 4 in being pushed into mould boots 6 is (when seeing Fig. 6-a, Fig. 6-b or Fig. 7-a, Fig. 7-b) before die cavity, distance rod 42 on the triple valve (see figure 8) in the mould boots 6 is not stressed, and at this moment, the commutation mouth 46 of reversing bar 39 aligns with loop hose interface 40, form a loop thereby make defeated powder flexible pipe 7 and loop hose 8 and hold 31 in powder tube, powdered lubricant then circulates in this loop and constantly flows.This closed circuit can reduce the pollution of powdered lubricant to environment, improves the flowability of powdered lubricant.When the shower nozzle in the mould boots 6 (is seen Fig. 6-a, Fig. 6-b or Fig. 7-a, Fig. 7-when b) moving on the die cavity, mould boots 6 are slack, and cylinder 4 moves on, the distance rod 42 that promotes on the triple valve (see figure 8) in the mould boots 6 moves along slideway 43, and distance rod 42 is connected in thrust interface 47 places on the reversing bar 39, thereby impel reversing bar 39 to slide, commutation mouthfuls 46 becomes with flexible pipe one interface 41 that dusts aligns, thereby make defeated powder flexible pipe 7 and dust and form a loop between the flexible pipe 9, powdered lubricant then flows in this loop, and original closed circuit disconnects.Powdered lubricant is by in the reversing bar (see figure 10) in the defeated powder flexible pipe 7 inflow triple valve (see figure 8)s, and through commutation mouth 46 dusts flexible pipe 9 with flexible pipe one interface 41 inflows of dusting in, after the flexible pipe 9 that dusts flows into shower nozzles (sees among Fig. 6-a, Fig. 6-b or Fig. 7-a, Fig. 7-b), under the corona field effect that corona guns 37 produces, electrostatic charge on the powdered lubricant band, under the effect of air-flow, charged powdered lubricant is sprayed by spout 38 and is adsorbed on the die wall.Dust finish after, reversal valve 15 commutation makes cylinder 4 recession, under the spring restoring force effect in the triple valve (see figure 8), reversing bar 39 is got back to original position again, promptly the commutation mouth 46 of reversing bar 39 aligns again with loop hose interface 40.At this moment, magnetic valve 11, magnetic valve 13, magnetic valve 14 are closed.Pressed powder put in the die cavity suppress, after the demoulding, this device repeats above-mentioned operating process again.

This installs the running of each step and cooperates the control by PLC, so this device realizes automation easily, boosts productivity.

The invention has the advantages that:

1, with the corona discharge mode is the innovative point of this novel electrostatic die wall lubrication device.Corona discharge can make electrostatic charge on any powdered lubricant band, and this has bigger flexibility to selection of lubricants, and the carried charge of powdered lubricant can be controlled preferably.

2, peripheral passage mechanism is another advantage of this novel electrostatic die wall lubrication device.The existence of peripheral passage mainly is for solving making full use of of powdered lubricant environmental pollution and powdered lubricant.

3, owing to adopt the defeated powder flexible pipe of single hole, therefore, there be not the obstructing problem of powdered lubricant to defeated powder flexible pipe in this invention, than easy care.Simultaneously, by control, also can control the powder outlet quantity of powdered lubricant preferably to throughput.

Description of drawings

Fig. 1 is that the novel die wall static of the present invention lubricating arrangement is always schemed.Wherein HV generator 1, jet system 2, hold powder tube cabinet 3, cylinder 4, guide plate 5, mould boots 6, defeated powder flexible pipe 7, loop hose 8, flexible pipe 9 dusts.

Fig. 2 is the jet system sketch.Wherein total air flow 10, magnetic valve 11, magnetic valve 12, magnetic valve 13, magnetic valve 14, reversal valve 15, choke valve 16, choke valve 17, choke valve 18, choke valve 19, choke valve 20, flowmeter 21, flowmeter 22, flowmeter 23, blow powder blast 24, cylinder blast 25, blast 26, secondary blast 27.

Fig. 3 is the powder installation drawing that holds of the present invention.Wherein blow powder blast interface 28, isocon 29, draw tube cell 30, hold powder tube 31, thermopnore 32.

Fig. 4 is the tube cell figure that draws of the present invention.This device places and holds powder tube 31, and links to each other with isocon 29 interfaces.

Fig. 5 is isocon figure of the present invention.Wherein defeated powder flexible pipe one interface 33, blast interface 34, a secondary blast interface 35, draw tube cell interface 36.

Fig. 6-a is the front view of shower nozzle, and Fig. 6-b is the spout figure of shower nozzle.Wherein corona guns 37, spout 38.

Fig. 7-a is the front view of side spray shower nozzle, and Fig. 7-b is the spout figure of side spray shower nozzle.Wherein corona guns 37, spout 38

Fig. 8 is triple valve figure of the present invention.Wherein reversing bar 39, loop hose interface 40, flexible pipe one interface 41, distance rod 42, slideway 43, sleeve 44 dust.

Fig. 9 is a cover sketch drawing of the present invention.

Figure 10 is reversing bar figure of the present invention.Wherein defeated powder flexible pipe two interfaces 45, commutation mouth 46, distance rod interface 47

Figure 11 is mould boots figure of the present invention.Flexible pipe two interfaces 48, cylinder interface 49 wherein dust.

Figure 12 makes on the cured powdered lubricant band of EBS after the electrostatic charge with apparatus of the present invention, records its charge-mass ratio value.Abscissa is magnitude of voltage (KV), and ordinate is an EBS wax powder charge-mass ratio value (μ c/g).

The specific embodiment

Because the 316L stainless steel powder has great viscosity in pressing process, easily produce great frictional force between particle and mould inner wall, influence the pressed density of stampings.Utilize novel electrostatic die wall lubrication device and temperature and pressure technology, and suppress the 316L stainless steel powder, can obtain highdensity 316L stainless steel green density in conjunction with following kollag.

Selected simple substance powdered lubricant has:

EBS wax powder (fineness :≤74 μ m); Zinc stearate (5～10 μ m); W-Special wax (fineness :≤15 μ m); Graphite (fineness :≤74 μ m).

The composite lubricated powder of being prepared has:

25～75%EBS wax+25～75% graphite; 25%～75%EBS wax+25%～75% zinc stearate; 25～75% graphite+25～75%W-special wax.

(above percentage is mass percent)

Example 1: measure this novel electrostatic die wall lubrication device and can make required carrying capacity on each powdered lubricant band by the corona discharge mode.Setting this device is example with 12KV voltage, the time of dusting is no more than 1 second at every turn, dust blast about 0.6MPa, defeated powder flexible pipe is long to be 1m, measure the carried charge of powdered lubricant with digital loadometer, with electronic analytical balance (precision: 0.0001g) measure the powdered lubricant quality, obtain the charge-mass ratio of powdered lubricant, its result is as shown in the table:

The charge-mass ratio value of table 1 each powdered lubricant under voltage 12KV

Powdered lubricant	EBS wax	W-special wax	Zinc stearate	Composite lubricated powder one	Composite lubricated powder two	Composite lubricated powder three	Composite lubricated powder four	Composite lubricated powder five
									Charge-mass ratio (μ c/g)	0.166	0.090	-1.733	-0.077	-0.095	0.651	0.532	0.555

Wherein: composite lubricated powder one: 25%EBS wax+75% graphite; Composite lubricated powder two: 50%EBS wax+50% graphite; Composite lubricated powder three: 25%EBS wax+75% zinc stearate; Composite lubricated powder four: 50%EBS wax+50% zinc stearate; Composite lubricated powder five: 75%EBS wax+25% zinc stearate.

As seen from Table 1, zinc stearate, composite lubricated powder three, composite lubricated powder four, composite lubricated powder five can both reach charge-mass ratio value (＞0.2 μ c/g) preferably, and other powdered lubricant is more relatively poor comparatively speaking, but increasing gradually along with voltage, each powdered lubricant also can both show charge characteristic preferably, is example (as Figure 12) with EBS wax.

Example 2: with this novel electrostatic die wall lubrication equipment powdered lubricant in the mould inner wall spraying, under chamber/temperature and pressure, (fineness :≤74 μ m), pressing pressure is at 680MPa, with micrometer method pressure measurement base density to adopt the outer lubricated or inside and outside lubricated mode that combines to suppress the 316L stainless steel powder.Each experimental result is as shown in the table:

The green density of table 2 316L stainless steel powder under the 680MPa press power

Lubricating system	Interior lubricated	0.2%W-special wax							0.2%EBS wax		Do not have
												Outer lubricated	Composite lubricated powder six			Composite lubricated powder two		EBS wax	Graphite	EBS wax		EBS wax
	Compacting powder heating-up temperature (℃)		120	120	120	120	120	120	120	Room temperature	110												Room temperature
The mold heated temperature (℃)												130	140	150	140	150	130	130	Room temperature	110	Room temperature
		Green density (g/cm 3)		7.35	7.35	7.32	7.16	7.10	7.13	7.13	6.72											7.10	6.56

Wherein: six: 50% graphite+50%W-special wax of composite lubricated powder.

By shown in the table 2, the green density of 316L stainless steel powder under the 680MPa press power under the different pressing conditions, therefrom as can be known: temperature and pressure and room temperature compacting are compared, and temperature and pressure more can make 316L stainless steel powder green density reach bigger value.Its reason mainly is: temperature and pressure improve the plastic deformation ability of metal powder on the one hand, main on the other hand is under temperature and pressure, the solid lubrication powder that is adsorbed on the die wall is soft state, helps improving the greasy property of powdered lubricant, thereby reduces the frictional resistance between metal powder and die wall.This shows that the mode that adopts electrostatic die wall lubrication and temperature and pressure technology to combine can improve green density and the demoulding of minimizing pressed compact is little, and the pressed compact outer surface is also more smooth.From shown in the table 2, under temperature and pressure, adopt the lubricated and interior lubricated lubricating system of 0.2%W-special wax of (50% graphite+50%W-special wax) composite lubricated powder of type outward, the 316L stainless steel powder can obtain maximum green density, easy in this experimentation pressed compact demoulding, the pressed compact surface presents light.

Claims (2)

1, a kind of powder metallurgy electrostatic die wall lubrication device, it is characterized in that: by universal compressed air source of the gas and HV generator (1), jet system (2), hold powder device, powder spraying system, hold powder tube cabinet (3), defeated powder flexible pipe (7), loop hose (8), the flexible pipe that dusts (9) form, each interface is continuous by flexible pipe; Holding the powder device is positioned at and holds within the powder tube cabinet.

2, according to the described device of claim 1, it is characterized in that: jet system (2) by total air flow (10), magnetic valve (11,12,13,14), reversal valve (15), choke valve (16), choke valve (17), choke valve (18), choke valve (19), choke valve (20), flowmeter (21), flowmeter (22), flowmeter (23), blow powder blast (24), cylinder blast (25), a blast (26), secondary blast (27) and form; Hold the powder device by blowing powder blast interface (28), isocon (29), draw tube cell (30), hold powder tube (31), thermopnore (32), defeated powder flexible pipe one interface (33), a blast interface (34), secondary blast interface (35), drawing tube cell interface (36) and form; Powder spraying system is made up of cylinder (4), guide plate (5), mould boots (6), corona guns (37), spout (38), reversing bar (39), loop hose interface (40), flexible pipe one interface (41) that dusts, distance rod (42), slideway (43), sleeve (44), defeated powder flexible pipe two interfaces (45), commutation mouthful (46), distance rod interface (47), flexible pipe two interfaces (48) that dust, cylinder interface (49); Defeated powder flexible pipe (7) one ends link to each other with interface (33) in the isocon (29), and the interior interface (45) of the other end and reversing bar links to each other; Interface (40) in loop hose (8) one ends and the triple valve links to each other, the other end with hold the powder tube and link to each other; The interface (41) that dusts in flexible pipe (9) one ends and the triple valve links to each other, and the interior interface (48) of the other end and mould boots links to each other.

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