JPH0235433Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a scraper device in a dehydrator.

FIG. 5 shows a dehydrator using the scraper device of the present invention.

Generally, this type of dehydrator includes a rotary screen 2 rotatably supported on a tank 1, a compression roller 3 that presses the transfer filter cloth against the rotary screen 2, and a scraper 4 disposed parallel to the compression roller 3.
It is equipped with.

Then, the sludge supplied from the supply section 5 is
While being dehydrated by a rotary screen 2 that rotates in the direction of
Furthermore, the sludge sandwiched between the filter cloth and the rotary screen 2 is dehydrated and discharged directly from the chute 6, or the sludge transferred to the filter cloth is passed through the scraper 4.
It is designed to be scraped off and discharged from the chute 6.

The inventor of the present invention has conducted various tests and research in order to improve the dewatering rate of sludge (that is, reduce the water content) in the dehydrator as described above, and as a result, the inventor has succeeded in dehydrating the sludge to a water content of 85% or less, which was previously difficult. It was effective.

(Prior Art) As shown in FIG. 6, the conventional scraper device has a rotating shaft 9 disposed parallel to the compression roller 3.
A scraper 4 is fixed to the machine frame, a bolt 10 is fixed to both ends of the rotating shaft 9 (only one end is shown in FIG. 6), and a tension spring 12 is stretched between the bolt 10 and a proper position 11 of the machine frame. By providing this, the shaft 9 is rotated and the scraper 4 is brought into contact with the filter cloth.

In addition, a technology has also been developed in which a stopper for removing cake-like sludge from the screen belt after dewatering is brought into contact with the belt or released by swinging an operating lever that is separate from the scraper support arm. It is known from Publication No. 57-90719.

(Problems with the prior art) By the way, in the former type of conventional scraper device, since the shaft 9 is rotated and energized by the tension spring 12, as mentioned above, when the water content of the sludge decreases, However, in this conventional scraper device, the scraper did not come into complete contact with the transfer belt 7, resulting in a problem that the transferred cake-like sludge could not be sufficiently peeled off.

Also, although the device shown in the latter publication does not have the drawbacks of the previous one, it is not only impossible to freely change the orientation of the scraper, but also difficult to replace.
The contact pressure of the scraper cannot be adjusted using the control lever.

(Purpose of the present invention) The purpose of the present invention is to solve the problems of the conventional scraper device as described above, and to sufficiently remove the sludge transferred to the transfer filter cloth using a simple mechanism even when the water content of the sludge decreases. The object of the present invention is to provide a scraper device for a dewatering machine that enables the scraper to be peeled off, the orientation of the scraper to be freely changed, the replacement work to be easy, and the contact pressure of the scraper to be adjusted. .

(Structure of the present invention) In order to achieve this purpose, the scraper device of the present invention includes a rotary screen to which sludge is supplied to the upper surface, a compression roller that presses the transfer filter cloth against the rotary screen, and a compression roller arranged parallel to the compression roller. A dewatering machine is equipped with a scraper that scrapes off sludge transferred to the transfer filter cloth by coming into contact with the transfer filter cloth, and the dewatering machine includes an arm fixed to at least both ends of a rotating shaft to which the scraper is fixed, and an arm fixed to at least both ends of a rotating shaft to which the scraper is fixed; consists of an operating lever having a separately provided Daruma-shaped rotary cam, and a link that is located between the operating lever and the arm to link the rotation of the operating lever with the rotation of the arm, and a link between the arm and the link. The structure is such that the rotational force of the operating lever is transmitted to the arm in a state where the interlocking is not connected to each other, by contact between the swash plate on the link side and the roller on the arm side, and further, the operating lever and the operating lever are A holding member was provided to maintain the scraper in contact with the transfer filter cloth when the arm rotated by a predetermined amount.

(Effects of the present invention) Since the scraper device of the present invention has the above-described configuration, it exhibits the following effects.

(i) The scraper is brought into contact with the transfer filter cloth by rotating arms fixed to at least both ends of the rotating shaft to which the scraper is fixed, using links, instead of relying on the urging force of a tension spring as in the past. Since the scraper is attached to the transfer filter cloth,
The sludge is completely abutted, so even if the water content of the sludge is reduced, the sludge can be sufficiently removed. Further, at this time, the state of contact of the scraper with the transfer filter cloth is maintained by the holding member.

(ii) Since the conventional scraper device relied on the biasing force of a tension spring, the pressure of the scraper on the filter cloth tended to be uneven, and the filter cloth was often worn out due to partial load. Since the scraper is pressed by rotating an arm fixed to at least both ends of the rotating shaft using a control lever and a link, the pressing force is uniform and the filter cloth is not worn out.

(iii) In the conventional scraper device, the rotation shaft 9 is required to bring the scraper into contact with the transfer filter cloth.
The tension springs 12 at both ends had to be hooked to the appropriate locations 11 on the machine frame, which caused safety problems such as injuries to fingers caused by the springs when hooking them, but the present proposal eliminates such concerns. There isn't.

(iv) Previously, when attaching and detaching the scraper, two people were required to operate the tension springs at both ends at the same time, one at each end, but with this proposal, all you have to do is operate the operating lever. Therefore, only one person can operate it.

That is, when the scraper is brought into contact with the filter, it is pressed against the filter by the dimensional difference of the Daruma-shaped rotating cam, and when the cam becomes vertical by operating the operating lever, the pressing force is released and the scraper becomes free. However, when the swash plate moves to a position where the scraper is removed from the filter, the swash plate does not exert any force on the roller, and the filter support shaft becomes a free end. Therefore, the scraper can be replaced easily, and the orientation of the scraper can be changed freely.

(v) Also, since the attachment/detachment operation has become easier in this way, the filter cloth can be easily replaced, cleaned, etc.

(vi) The contact pressure of the scraper against the filter has conventionally been applied using cylinders or springs, and it is not possible to apply that force in a constant step-by-step manner, which will accelerate damage to the filter. The contact pressure can be adjusted at the stop position on the arc dimension of the rotating cam, and where the filter is new, it makes soft contact and can minimize damage.

(vii) Since the rotary cam of the present invention uses a Daruma-shaped cam, the same effect can be obtained even if the operating lever is rotated to the left or right, thereby preventing erroneous operation.

(Example) Figures 1 to 4 show an example of the present scraper device, in which Figure 1 is a partial perspective view, Figure 2 is a front view, and Figure 3 is a partial enlarged view. ,
FIG. 4 is a sectional view taken along line AA in FIG.

In FIGS. 1 and 2, reference numeral 20 denotes a rotating shaft installed horizontally on a frame plate 21 (see FIG. 5) of the dehydrator as in the conventional case, and a scraper 22 is fixed to this rotating shaft 20. Further, arms 23, 23 are fixed to both ends of the rotation shaft 20. Arm 23
Since the boss 24 is fitted onto the rotating shaft 20 and fixed with a bolt 25, the fixing position can be adjusted. A roller 26 is provided at the tip of the arm 23.

30 is an operating lever, and between this operating lever 30 and the arms 23, 23, there is a link 40 for interlocking the rotation of the operating lever and the arm 23;
There are 40.

The operating lever 30 is provided with a cam device 50 and a clutch mechanism 60 above it, as shown in FIGS. 3 and 4.

The cam device 50 is connected to the frame plates 21, 21 of the dehydrator.
A shaft 5 is mounted at the center of a support plate 27 having an L-shaped cross section and suspended horizontally.
Daruma-shaped rotary cam 52 rotatably supported at 1
Consisting of

The clutch mechanism 60 includes a fixed metal fitting 61 fixed to the upper surface of the cam 52, a movable metal fitting 63 attached to the upper end of the shaft 51 with a stabilizing compression spring 62 interposed between the fixed metal fitting 61, and a movable metal fitting 63 attached to the upper end of the shaft 51. It consists of an upper end portion 31. The fixing fitting 61 is U-shaped in side view, and a notch 65 into which the tip 32 of the operating lever is inserted is formed in the upright piece 64 at the lower end. The movable metal fitting 63 is F-shaped in side view, and the upper end 31 of the operating lever 30 is inserted into a hole opened in the two upright pieces 66, 66. To prevent the operating lever 30 from coming off,
A recess 33 is formed at the upper end of the operating lever, and a screw 6 that engages with the recess 33 is provided in the movable metal fitting 63.
7 is provided. The length of the recess 33 is such that the operating lever 30 can be pushed up and its tip 32 can be inserted into the notch 65 of the fixing fitting.

Therefore, according to the clutch mechanism as described above, the operating lever 30 is pushed up and the upper end 3
2.Cut out the upright piece 64 on the lower side of the fixing bracket 65.
By inserting and turning the cam 52, the cam 52 can be rotated.

As shown in FIG. 1, the link 40 is L-shaped and includes two L-shaped metal fittings 2 fixed to the support plate 27.
It is slidably attached at 8,28. At one end of the link 40 is a roller 4 that comes into contact with a cam 52.
1 is attached to the other end, and the arm 23 is attached to the other end.
A swash plate 42 that comes into contact with the roller 26 is fixed. In addition, a sleeve 4 is provided at the intermediate portion of the link 40.
3 is fixed with a screw 44 so that its fixed position can be adjusted, and a spring 45 is interposed between this sleeve 43 and the L-shaped fitting 28, and a link 40
The roller 41 is always urged in the direction of contacting the cam 52. The swash plate 42 is formed at a predetermined angle with respect to the sliding direction of the link 40 so that when the link 40 moves to the left as shown by the arrow a in FIG. 1, the arm 23 is rotated clockwise as shown by the arrow b. It is installed tilted. Note that the arm 23 is urged by its own weight and the weight of the scraper 22 in a direction in which the roller 26 is always in contact with the swash plate 42 .

Therefore, in the above-described scraper device, when the operating lever 30 is in the hanging state and the Daruma-shaped rotary cam 52 is in the vertical direction, the scraper 22 is in the hanging state due to its own weight. This is transfer filter cloth 7
When the operating lever 30 is pushed up and the Daruma-shaped cam 52 is moved laterally via the clutch mechanism 60, the links 40, 40 slide in the opening direction, and the swash plates 42, 42 rotate the arm 23. When the scraper 22 is rotated, the scraper 2
2 comes into contact with the transfer filter cloth 7 and peels off the sludge.

By the way, when the Daruma-shaped rotary cam 52 is placed in the horizontal direction, since the roller 41 of the link 40 is urged toward the cam 52 by the spring 45, the Daruma-shaped rotary cam 52 tries to return to the vertical direction. Some kind of retention means is necessary as this will cause a tendency.

Therefore, in this embodiment, a stopper 70 is provided as a holding member.The stopper 70 has a base 71 fixed to the support plate 27, and a tip 72 of the stopper 70 so that the operating lever 30 is slightly moved from the horizontal direction. It is provided in a protruding manner so as to come into contact with the operating lever 30 when rotated upward by θ.

That is, the stopper 70 is connected to the operating lever 30.
When the cam is rotated upward by a certain angle θ from the horizontal direction, the rollers 41 and 41 press the cam 52 based on the urging force of the springs 45 and 45, causing the cam 52 to further rotate and return to the vertical position (initial position). This prevents the links 40, 40 from being rotated to a position opposite to the position shown in FIG. It is something that has become popular.

In order to release this holding state, it is sufficient to pull out the tip 32 of the operating lever 30 from the notch 65 of the fixture 61, and when the tip of the operating lever is pulled out, the cam 52 becomes independent of the rotation of the operating lever. The link 40, 40 slides in the closing direction and the scraper 22 also rotates in the hanging direction, releasing the contact state with the transfer filter cloth. becomes.

The stoppers 70 are provided on both sides of the cam device, so that the same effect can be obtained regardless of whether the operating lever 30 is rotated left or right.

Also, at the stop position of the arc dimension of the Daruma type rotating cam,
By changing the sliding amount of the links 40, 40, it is also possible to change the contact pressure of the scraper 22 against the filter cloth.

In addition, in this embodiment, the stopper 70
The contact pressure of the scraper can be arbitrarily changed by making the regulating angle θ of the operating lever 30 different on the left and right sides and by changing the inclination angle of the swash plate 42.

Although one embodiment of the scraper device of the present invention has been described above, the invention is not limited to this, and any suitable embodiment can be adopted within the scope of the technical idea of the present invention. For example, the arms 23 may be provided at appropriate locations in addition to both ends of the rotation shaft. In this case,
Provide a swash plate accordingly.

etc.

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view showing an example of the scraper device in the dehydrator of the present invention, Fig. 2 is a front view of the same as above, Fig. 3 is a partially enlarged view of Fig. 2, and Fig. 4 is
FIG. 3 is a sectional view taken along line A-A, FIG. 5 is a front view of a dehydrator, and FIG. 6 is a partial perspective view of a conventional scraper device. 20...Rotation axis, 22...Scraper, 23
... Arm, 26 ... Roller, 30 ... Operation lever, 40 ... Link, 42 ... Swash plate, 70 ...
Holding member.

Claims (1)

[Scope of utility model registration request] A rotary screen to which sludge is supplied to the upper surface, a compression roller that presses the transfer filter cloth against the rotary screen, and a compression roller that is arranged parallel to the compression roller so that the sludge is transferred to the transfer filter cloth by contacting the transfer filter cloth. A dehydrator equipped with a scraper for scraping off sludge, comprising an arm fixed to at least both ends of a rotating shaft to which the scraper is fixed, an operating lever having a Daruma-shaped rotating cam provided separately from these arms, and the operating lever. and a link between the arm and interlocking the rotation of the control lever and the rotation of the arm, and the rotational force of the control lever is transmitted to the arm in a state where the arm and the link are not connected to each other. When the swash plate on the link side and the roller on the arm side come into contact with each other so that the scraper contacts the transfer filter cloth, the operation lever and arm are rotated by a predetermined amount. A scraper device for a dehydrator, which is provided with a holding member that maintains the contact state.