JPH0644896Y2 - Fluid jet nozzle - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a fluid ejection nozzle, and in particular, to a belt surface of a conveyor belt on the return side of a conveyor belt, the residual adhered matter of the conveyed material is ejected onto the belt surface. The present invention relates to a nozzle used in a fluid jet type belt cleaner device for removing from a nozzle.

[Conventional technology]

Conventionally, multiple cleaners are attached in the longitudinal direction of the beam,
A belt cleaner device is known in which the scraper of the cleaner is pressed against the return-side outer surface of the conveyor belt. Since this scraper type belt cleaner device has a structure in which the tip of the scraper scrapes off the remaining deposits on the belt surface, there is a problem that the tip wears early.

On the other hand, a belt cleaner device is known in which a fluid such as water is jetted to the outer surface of the belt on the return side to scatter and drop residual deposits on the belt surface. This fluid jet type belt cleaner device has an advantage that it does not cause wear of parts like the scraper type belt cleaner device described above, but it does not have residual substances such as sticky substances firmly adhered to the belt surface. There is a problem that the kimono cannot be completely removed. Also, when water is sprayed, a large amount of water adheres to the belt surface and water is contained in the conveyed product in the next round.Therefore, a separate device for wiping off the adhered water must be installed in parallel. There are problems that must be addressed.

For this reason, the present inventor has found that it is advantageous to arrange the scraper type belt cleaner device and the fluid jet type belt cleaner device side by side, and utilize the respective advantages to perform the cleaning work while making up for each other's disadvantages. did.

Therefore, if such a juxtaposed configuration is adopted, most of the deposits remaining on the belt surface can be removed by jetting the fluid, and the deposits that have not been completely removed by the jetting and remain on the belt surface continue. Since it is removed by the scraper, the wear of the tip of the scraper is small, the replacement life is long, and the problems peculiar to the conventional scraper type belt cleaner device can be solved.

Further, when a liquid is used for fluid ejection, the liquid adhering to the belt surface can be wiped off with a scraper, and the problems peculiar to the conventional fluid ejection type belt cleaner can be solved.

In particular, attach multiple cleaners in the longitudinal direction of the beam,
For a conventional scraper type belt cleaner device in which the scraper of the cleaner is pressed against the return-side outer surface of the conveyor belt, a fluid passage is formed by using the beam, and a nozzle device is provided in the beam, This makes it possible to combine the functions of the conventional fluid jet belt cleaner device, and thus, it is possible to combine the functions of two conventional devices even though it is one device. Therefore, unlike the case where two conventional devices, a fluid jet type belt cleaner device and a scraper type belt cleaner device, are separately installed side by side on a conveyor belt, it suffices to install only one of the above devices. The work is quick and easy, and the cost of the device itself is low.

[Problems to be solved by the device]

By the way, in the case of configuring the belt cleaner device as described above, when a scraping piece of the residual adhered scraped by the scraper falls, it is deposited on the tip portion of the fluid ejection nozzle,
There is a problem of clogging of the nozzle opening. That is, when the fluid is constantly ejected from the nozzle opening at the time of cleaning the belt, the scraping piece can be repelled by the ejected fluid so as not to adhere to the nozzle opening, but the fluid ejecting belt cleaner function is stopped. When performing the cleaning work only with the scraper type belt cleaner function in this state, it is inevitable that the above clogging will occur.After that, even if the fluid is supplied to operate the fluid jet type belt cleaner function, the fluid will not flow from the nozzle port. However, in the worst case, there is a problem that excessive fluid pressure is generated in each part, causing damage to the connecting parts of the members and fluid leakage due to this.

[Means for Solving the Problems]

The present invention provides a fluid ejection nozzle that solves the above-mentioned problems. A means for that purpose is to provide a nozzle piece 31 having a male screw on the outer circumference of the tip and a fluid ejection nozzle at the tip of the nozzle piece 31. A nozzle 34 attached to the outlet,
A protective cylinder 36 externally fitted to the nozzle 34 and the nozzle piece 31
And a tightening ring 37 that constitutes a nut that is screwed to the male screw of the nozzle. The nozzle 34 includes a tubular portion 35 that communicates with the ejection port of the nozzle piece 31, and a tip wall that closes the tip of the tubular portion. 35a and the flange 35c at the tail end of the tubular portion 35 are integrally formed of an elastic material, and the tip wall 35a is provided with a slit-shaped nozzle port 35b opened by fluid injection pressure. ,
A tubular wall 36a for restraining the tubular portion 35 of the nozzle 34 from the outer periphery and a flange wall 36b at the tail end of the tubular wall 36a are integrally formed,
The tightening ring 37 crimps the flange wall 36b in the axial direction of the nozzle piece 31 while the flange 35c of the nozzle 34 is sandwiched between the tip edge of the nozzle piece 31 and the flange wall 36b of the protection tube 36. The point is that it is provided with a locking portion 37a that is tightened.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

First, a belt cleaner device as an example of use of the fluid ejection nozzle of the present invention will be described. As shown in FIG. 1, an endless conveyor belt 1 has a forward side 1a and a return side with a winding portion around a pulley 2 as a boundary. It is distinguished from side 1b.
That is, on the forward side 1a, the conveyed product A is conveyed and dropped at the wrapping portion.
On the return side 1b, residual deposit B is adhered to the belt surface (therefore, in the present invention, the "return side 1b" refers to the conveyed product in the belt traveling direction regardless of whether it is on the winding portion or not. Say the belt that is in the process of falling. A beam 3 is arranged below the return side 1b of the belt 1, and both ends of the beam 3 are supported by columns 4 and 4 as shown in the second illustration. That is, the columns 4 and 4 have a holder 5 which is appropriately attached to a fixing member such as a frame or a hopper of a belt conveyor device and which holds the beam 3.
As shown in FIG. 3, the holder 5 is composed of a pair of split bodies 5a and 5b, and the split body 5 is held by fastening the split bodies with bolts 6 and 6 sandwiching the beam 3 therebetween. One of the divided bodies 5a is attached to the column 4 by a bolt / nut 7, and the bolt insertion hole of the column 4 is a long hole 8 which is long in the vertical direction. Further, a pedestal 9 is fixed to the column 4 below the holder 5 by bolts and nuts 10, and an adjustment bolt 11 is screwed to the pedestal 9 so as to be movable back and forth. Therefore, by loosening the bolt / nut 7 and pushing up the holder 5 with the adjusting bolt 11, the position of the holder 5 holding the beam 3 can be adjusted in the vertical direction.

As shown in FIGS. 1 and 4, the beam 3 is made of a hollow tubular member, and a bracket 12 along the longitudinal direction is fixed to the outer peripheral surface of the beam by welding or the like. Cleaner 13
A scraper plate 15 and a mounting plate 16 are integrally fixed to each other with an elastic body 14 such as rubber interposed therebetween, and a bolt 17 protruding from the rear of the mounting plate 16 is attached to the bracket 12 via a nut 18. There is. The scraper plate 15 extends above the elastic body 14, and a chip base 19 is provided at the extending end. The chip base 19 is provided with a chip 20 projecting upward.
A bolt 21 projecting from the rear portion of 19 is attached near the upper end of the scraper plate 15 via a nut 22. Thus, the tip 20 is pressed against the outer surface of the return side 1b of the belt 1 through the elastic force of the elastic body 14.

The scraper type belt cleaner device is configured as described above, and the following configuration is provided in order to combine such a device with the fluid ejection type belt cleaner device.

That is, the beam 3 constitutes the fluid passage 23 by the tubular hollow portion. As shown in FIG. 2, one end of the passage 23 is closed by a cap member 24 attached to one end of the beam 3, and the other end thereof is a connecting member 25 for connecting a fluid supply pipe (not shown). Is installed. The connecting member 25 is detachably screwed to the other end of the beam 3, and includes a housing part 26 having a strainer and a valve casing 27 having a pressure reducing valve. It has a connecting portion 28 for detachably connecting the supply pipe with a screw. Thus, beam 3
A plurality of nozzle devices 29 are arranged at intervals in the longitudinal direction.

In the present embodiment, for each of the four cleaners 13, one nozzle device 28 (and thus a total of two nozzles) is arranged near the adjacent portions of the pair of cleaners 13, 13 located on both sides. As shown in FIG. 4, the nozzle device 29 has a nozzle holding cylinder 30 fixed to the outer peripheral surface of the beam 3 by welding or the like, and a nozzle piece 31 inserted into the holding cylinder. The nozzle holding cylinder 30
Are communicated with the fluid passage 23 through fluid discharge holes 32 formed in the peripheral wall of the beam 3. The nozzle piece 31 is inserted into the holding cylinder 30 so as to be able to move back and forth through a screw means, and is held airtightly or watertightly by a packing or the like although not shown. When a fluid supply pipe is connected to the connecting portion 28 and a pressure reducing valve in the valve housing 27 is opened by a predetermined amount via the handle 33, the fluid supplied to the fluid passage 23 is a nozzle device under a predetermined pressure. From the nozzle 29, at this time, as shown in FIG. 4, the jetting angle θ of the fluid by the nozzle device 29 is
It is preferably about 45 degrees upward from the horizon.
Further, the nozzle piece 31 is such that the jetted fluid is on the belt return side.
It has a nozzle hole that spreads flatly over a wide width (for example, about 30 cm) when reaching 1b.

A nozzle 34 is attached to the fluid ejection port of the nozzle piece 31. As shown in FIG. 5, the nozzle 34 includes a tubular portion 35 that communicates with the fluid ejection port of the nozzle piece 31, a tip wall 35 a that closes the tip of the tubular portion 35, and a tail end of the tubular portion 35. The formed tubular portion 35, the tip wall 35a, and the flange 35c are integrally formed of an elastic material such as rubber. The tip wall 35a is formed with a slit-shaped nozzle opening 35b which is opened by the fluid ejection pressure. In the illustrated example, the nozzle opening 35b is formed by a cross-shaped slit, but it may be Y-shaped or single-character shaped.

When attaching the nozzle 34 to the nozzle piece 31,
A protective tube 36 and a clamp ring 37 as shown are used. The protection tube 36 is made of metal, and has a tube wall 36a externally inserted in the tube portion 35 of the nozzle 34, and a flange wall 36 formed at the tail end of the tube wall 36a.
and b are integrally formed. The tightening ring 37 constitutes a nut to be screwed with a male screw formed on the nozzle piece 31, and includes a locking portion 37a formed as an inner circumferential protrusion. Therefore, nozzle 3
When the protective tube 36 is externally inserted into the 34, and the respective flange walls 36b and the flanges 35c are positioned inside the locking portion 37a, the tightening ring 37 is screwed onto the male screw of the nozzle piece 31, The flange wall 36b and the flange 35c are sandwiched between the tip edge of 31 and the locking portion 37a of the tightening ring 37, whereby the nozzle 34 is attached to the nozzle piece 31, and the tubular portion 35 of the nozzle 34 is It is protected by the protection tube 36.

Therefore, when the fluid is pumped to the fluid passage 23 as described above and the fluid is to be ejected from the nozzle device 29, the tip wall 35a is elastically deformed by the fluid ejection pressure from the nozzle piece 31 and the slit-shaped nozzle opening 35b. Is opened and the above injection is performed. At this time, if the protective cylinder 36 is not provided, the pressure of the fluid filling the nozzle 34 causes the cylindrical portion 35 to expand in the direction in which the diameter increases, and the tip wall 35a is expanded in the radial direction. Make the nozzle opening 35b open unnecessarily large,
As a result of increasing the ejection amount of the fluid, the ejection force of the fluid is reduced. Therefore, in order to secure the ejection force of the fluid under such a configuration, there is a problem that a pump or the like for feeding the fluid to the fluid supply pipe has to be made large.
There is also a problem that the amount of fluid consumed unnecessarily increases when the nozzle port 35b is opened greatly as described above.

In this regard, according to the present invention, since the protective cylinder 36 is externally inserted into the cylindrical portion 35 of the nozzle 34 and the cylindrical portion 35 is constrained so as not to expand from the outer periphery, the pressure of the fluid filled in the nozzle 34 is reduced. The tubular portion 35 is not expanded even by the above, and only the tip wall 35a is deformed in the ejection direction so that the nozzle port 35b can be opened in the minimum necessary range, so that it is sufficient even if the fluid pressure source such as a pump is small. It is possible to obtain a jetting force of various fluids. Incidentally, the present invention, as described above, is mainly for removing the residual deposits on the surface of the conveyor belt, and not for cleaning the belt surface. It is not necessary that the ejection amount be large, but rather the ejection amount is preferably small from the viewpoint of resource saving.

By the way, due to the pressure of the fluid, the nozzle 34 is
It receives a pushing force toward the tip of the, but as mentioned above,
Between the locking portion 37a of the tightening ring 37 and the tip edge of the nozzle piece 31,
Since the flange wall 36b of the protective cylinder 36 and the flange 35c of the nozzle 34 are sandwiched, the nozzle 34 does not come off from the nozzle piece 31 and fly, and a stable and firmly attached state can be secured. Also in this case, since the nozzle 34 is entirely along the cylindrical wall 36a and the flange wall 36d of the protective cylinder 36 from the outer peripheral portion to the flange 35c, the nozzle 34 is freely deformed and the tightening ring. It does not come off from 37, and is securely sandwiched between the locking portion 37a of the tightening ring 37 and the tip edge of the nozzle piece 31 to prevent falling off.

Moreover, since the clamping ring 37 is sandwiched by the flange 35c of the nozzle 34 made of an elastic material, the flange 35c functions as a spring washer and prevents the tightening ring 37 from loosening. The tightening ring 37 does not loosen on the male screw of the nozzle piece 31 due to the vibration of the cleaner 13, etc.
The nozzle 34 can always be securely and firmly fixed.

On the other hand, when the pumping of the fluid is stopped and the fluid is not ejected from the nozzle piece 31, the tip wall 35a is elastically restored to close the slit-shaped nozzle port 35b. Therefore, when the residual deposits on the belt surface are scraped off by the cleaner 13 only without cleaning the fluid, as in the conventional scraper type belt cleaner device, the nozzle holes of the nozzle piece 31 are scraped by the accumulated fallen objects. It will not be blocked and will not disable the subsequent fluid ejection.

By the way, the fluid supplied through the fluid supply pipe connected to the connecting member 25 may be a water source such as well water or tap water, but the fluid that is ejected from the nozzle device 29 and reflected on the belt surface and dropped is used. When a circulating fluid supply mechanism that stores in a water tank and feeds a fluid from the water tank to the supply pipe via a pump is adopted, the fluid supplied from the connecting member 25 to the fluid passage 23 is It is unavoidable to contain minute impurities such as dust. It is difficult to completely capture such minute impurities by the strainer, and the fluid containing the minute impurities is ejected from the nozzle device 29. In this case, the nozzle opening 35b of the nozzle 34 formed of an elastic material
Is intended to be worn when a fluid containing minute impurities passes through, gradually expand the nozzle opening 35b, and completely close the nozzle opening 35b when not receiving the fluid injection pressure as described above. I can't fulfill. Therefore, as shown in FIG. 6, it is preferable to cover the edge of the tip wall 35a forming the nozzle opening 35b with the protective material 40. The protective member 40 can be formed of, for example, a wear resistant material such as ceramics or cemented carbide, but may be formed of a thin metal plate. When covering the rim of the tip wall 35a, not only the part of the rim (slit surface) is covered with the protective material 40, but also the inner folds that cover the inner part of the rim as shown in the figure. An outer folded portion 40b may be formed to cover the portion 40a and the outer portion of the rim.

Further, in the illustrated embodiment, as shown in FIGS. 2 and 4, the cleaner 13 is provided with a guide plate 38.
The guide plate 38 is made of a metal plate or a synthetic resin plate having excellent wear resistance, and is provided for each cleaner 13 in the illustrated example. The guide plate 38 has the same width as the chip 20 and has a length from the chip base 19 to the lower side of the beam 3, and is in the vicinity of the upper edge of the scraper plate 15 in a state of being superposed on the front side of the scraper plate 15. The part is sandwiched and held between the chip base 19 and the scraper plate 15. That is, the chip base 19, the guide plate 38, and the scraper plate 15 are fastened together by the bolts 21 and the nuts 22. Further, the guide plate 38 has a notch 39 opened at a portion corresponding to the nozzle device 29. In the illustrated example, a pair of guide plates 38, 38 that are adjacent to each other have symmetrical cutouts 39 facing each other at their adjacent edges, and the cutouts 39, 39 form a circular opening. Therefore, the four guide plates 38 shown in FIG. 2 have the same shape, and are used in an upside-down state alternately corresponding to the position of the nozzle device 29. Although the tip of the nozzle device 29 projects from the notch 39 in the illustrated example, the nozzle device 29
It is possible to freely form the tip of the recess so that it does not protrude from the guide plate 38.

Thus, in both cases of ejecting the fluid from the nozzle device 29 and cases of not ejecting the fluid, the residual deposits of the belt scraped off by the tip 20 of the cleaner 13 are preferably dropped along the guide plate 38. The elastic body 14 and the nozzle device 29 are prevented from being deposited on the elastic body 14 and the nozzle device 29.

When the fluid ejected from the nozzle device 29 is a liquid such as water, the liquid adhering to the surface of the belt 1 is suitably wiped by the cleaner 13, and the wiped liquid is guided by the guide plate 38.
Therefore, it is prevented from falling onto the elastic plate 14 and the beam 3 in a suitable manner.

Although the example in which the nozzle device 29 is used in the belt cleaner device has been described above, it should be appreciated that the fluid ejection nozzle of the present invention can be used for various purposes without being limited to the use object.

[Effect of device]

 The present invention has the following effects.

In an environment where dust and other falling objects accumulate on the tip of the fluid ejection nozzle, the nozzle opening 35b is closed when the fluid is not ejected and the nozzle opening 35b is clogged with these falling objects. This can be suitably prevented. On the other hand, when ejecting fluid, the nozzle is
The tip wall 35a of 34 is elastically deformed to open the nozzle port 35b, thereby making it possible to suitably eject the fluid. Therefore, it is possible to provide a nozzle that can always perform good operation without requiring maintenance.

Further, according to the present invention, the tubular portion 35 and the tip wall are made of elastic material.
The nozzle 34, which is integrally formed with 35a, has a protection tube 36
Since the cylindrical portion 35 is constrained from the outer periphery by this protective cylinder 36, the cylindrical portion 35 is not expanded by the pressure of the fluid, and therefore only the tip wall 35a is deformed in the ejection direction. Since the mouth 35b can be opened in the minimum necessary range, a small fluid pressure source such as a pump is sufficient, and a strong jet output can be expected while suppressing the consumption of the jetted fluid.

Further, during ejection of fluid, the nozzle 34 is
Although it receives a pushing force toward the tip direction of the nozzle piece 31, a flange wall 36b of the protection cylinder 36 and a flange 35c of the nozzle 34 are provided between the locking portion 37a of the tightening ring 37 and the tip edge of the nozzle piece 31. Because of the sandwiched structure, the nozzle 34 does not come off from the nozzle piece 31 and flies, and a stable and firmly attached state can be secured. That is, the entire nozzle 34 from the outer peripheral portion to the flange 35c is constrained by the cylinder wall 36a and the flange wall 36d of the protective cylinder 36 and does not deform freely, so it is difficult to disengage from the tightening ring 37. In addition, the tightening ring 37 Since the flange 35c is securely sandwiched between the engaging portion 37a of the nozzle and the tip edge of the nozzle piece 31, the nozzle 34
Is prevented from falling off.

Moreover, the flange 35c of the nozzle 34 made of an elastic material is interposed between the tightening ring 37 and the nozzle piece 31, and the tightening of the tightening ring 37 is performed by compressing and deforming the flange 35c. Therefore, the flange 35c can be made to function as a spring washer, and it is expected that the tightening ring 37 can be prevented from loosening with respect to the male screw of the nozzle piece 31, so that the tightening ring 37 will not be damaged by vibration of the cleaner 13. There is no slack on the male screw, and the nozzle 34 can always be securely and firmly fixed.

[Brief description of drawings]

FIG. 1 is a side view of a belt cleaner device showing an example of use of the fluid ejection nozzle of the present invention, FIG. 2 is a partially cutaway front view of the belt cleaner device, and FIG. 3 is a sectional view taken along line III-III of FIG. FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 2, FIG. 5 is an enlarged sectional view showing a nozzle according to an embodiment of the present invention, and FIG.
The drawing is an enlarged cross-sectional view showing a nozzle according to another embodiment. 1 …… Belt, 13 …… Cleaner, 14 …… Elastic body, 15 ……
Scraper plate, 16 …… Mounting plate, 19 …… Chip base, 20…
… Tip, 23 …… Fluid passage, 25 …… Coupling material, 28 …… Coupling part, 29 …… Nozzle device, 30 …… Nozzle holding cylinder, 31 …… Nozzle piece, 34 …… Nozzle, 35a …… Tip wall , 35b …… Nozzle port, 35c …… Flange, 36 …… Protective tube, 36a …… Cylinder wall, 36
b …… Flange wall, 37 …… Tightening ring, 37a …… Locking part, 40…
…Protective layer.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B65G 45/24 9245-3F B65G 45/00 524

Claims (1)

[Scope of utility model registration request] 1. A nozzle piece 31 having a male screw formed on the outer periphery of its tip.
A nozzle 34 attached to the fluid ejection port at the tip of the nozzle piece 31, a protective cylinder 36 externally fitted to the nozzle 34, and a nut configured to be screwed to the male screw of the nozzle piece 31. The nozzle 34 is formed of a ring 37, and the nozzle 34 is connected to the ejection port of the nozzle piece 31.
35, a tip wall 35a closing the tip of the tubular portion, and the tubular portion 35
The flange 35c at the tail end of is formed integrally with an elastic material,
The tip wall 35a is provided with a slit-shaped nozzle opening 35b that is opened by fluid injection pressure, and the protective cylinder 36 includes a cylinder wall 36a that constrains the cylinder portion 35 of the nozzle 34 from the outer periphery, and a tail of the cylinder wall 36a. It is formed by integrally forming the end flange wall 36b, and the tightening ring 37 is in a state in which the flange 35c of the nozzle 34 is sandwiched between the tip edge of the nozzle piece 31 and the flange wall 36b of the protective cylinder 36. A fluid ejection nozzle, comprising: a locking portion 37a for crimping the flange wall 36b in the axial direction of the nozzle piece 31.