JPH034464Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a belt press type dehydrator that continuously dewaters slurry by supplying it between a pair of endless filter cloths.

``Prior Art'' Conventionally, in a belt press type dehydrator having a gravity dewatering zone, a wedge zone, and a press zone, the lengths of a pair of endless filter cloths are generally different due to its structure. Each endless filter cloth is connected in an endless manner by lacing. In these endless filter cloths, the material to be treated is interposed in the center, and the circumference of the central portion is longer than the ends of the filter cloth by the thickness of the material, which delays the progress of the process. Become. Therefore, as shown in FIG. 5, the lacing portion 2 of the endless filter cloth 1 curves with respect to the traveling direction A, causing a so-called streak bending phenomenon. This phenomenon becomes more severe as the length of the endless filter cloth becomes shorter; for example, when the length of the endless filter cloth is 25 m,
If the length of the cake is 15m and the thickness of the cake (processed material) is 15mm, the length of the curved line B is 150mm and 230mm, respectively.
It will be about.

By the way, when operating the conventional belt press type dehydrator mentioned above (for example, the throughput of mixed raw sludge is 150
Kg/m. H. When the cake moisture content is 78%), the operating tension of the endless filter cloth is approximately 25 to 30 kg/cm at maximum. When such a large tension was applied to the lacing portion 2, wrinkles 3 were formed from near the center, as shown in FIG. 6.

This invention was made in view of the above circumstances,
The purpose is to provide a belt press type dehydrator that can prevent wrinkles from forming in the lacing part and maintain good dewatering performance.

"Means for Solving the Problem" There are two ways to prevent the wrinkles 3 that occur in the lacing part 2: to reduce the bending of the lacing part 2, and to reduce the tension applied to the endless filter cloth 1. This is conceivable, but in order to reduce the streak bending, the thickness of the dehydrated cake and the length of the filter cloth must be changed, which is not realistic. On the other hand, in order to reduce the tension applied to the endless filter cloth 1,
It is possible to reduce the operating tension through an air spring, an air cylinder, etc., or to reduce the tension by using a filter cloth driving force.

In the present invention, the tension caused by the filter cloth driving force is suppressed to a predetermined value or less to prevent the occurrence of wrinkles in the casing portion. It is equipped with a torque limiter that stops the drive when the load applied to the roll exceeds a set value.

"Function" In the load-responsive belt press type dehydrator of the present invention, the torque limiter provided on the inner filter cloth drive roll that drives the shorter inner filter cloth of a pair of endless filter cloths , when a load larger than a set value is applied to the inner filter cloth drive roll, the drive of the inner filter cloth drive roll is stopped, the tension applied to the inner filter cloth is suppressed to a small level, and the generation of wrinkles in the lacing part is prevented. .

"Embodiment" Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 4.

Reference numeral 10 in the figure is an endless outer filter cloth, and this outer filter cloth 10 includes guide rolls 20, 21 that support the gravity dehydration zone X, a large number of clamping pressure rolls 22 of the wedge zone Y,... Press rolls 23, 24, 25, 26, 2 whose diameter gradually decreases in zone Z
7, 28, 29, and 30, an adjustment roll 31 that applies operating tension to the outer filter cloth 10, and three guide support rolls 32, 33, and 34. Further, 11 is an endless inner filter cloth shorter in length than the outer filter cloth 10, and this inner filter cloth 11 is used for each clamping roller 22 in the wedge zone Y and each press roll 23 in the press zone Z. 30, an adjustment roll 35 that applies operating tension to the inner filter cloth 11, and two guide and support rolls 36 and 37.

Each of the press rolls 29 and 30 is
Chain wheels 40 and 41 serve as drive rolls for each of the filter cloths 11 and 10, and are attached to one end of each drive roll 29 and 30, and an idler 4
2 and a chain wheel 44 of the rotational drive mechanism 43
A chain 45 is wound between the drive rolls 29 and 30, so that the drive rolls 29 and 30 are rotated. The chain wheel 41 attached to the outer filter cloth drive roll 30 is fixed to the outer filter cloth drive roll 30, while the chain wheel 40 on the inner filter cloth drive roll 29 side is connected to the outer filter cloth drive roll 30 through a torque limiter 50. It is connected to an inner filter cloth drive roll 29.

This torque limiter 50 includes a pair of clamping members 51 that clamp the chain wheel 40 from both sides;
52 and these clamping members 51 and 52 together with the chain wheel 40 via the intervening member 53,
A plurality of pressing members 55 press against the stepped portion side (left side in FIG. 1) of the support member 54 fixed to the end of the inner filter cloth drive roll 29, and a plurality of pressing members 55 are attached to the support member 54 via attachment members 56. , and an adjusting member 57 that adjusts the pressing force of the pressing member 55. When a load exceeding the pressing force adjusted by the adjusting member 57 is applied to the inner filter cloth driving roll 29, the chain wheel 40 moves the inner filter cloth driving roll 29. The connection state with 29 is released and it is designed to idle.

In addition, in FIG. 2, the reference numeral 60 is a feed device that supplies the processed material to the gravity dewatering zone X.

In the belt press dehydrator configured as described above, the feed device 60 feeds the processed material onto the outer filter cloth 10 of the gravity dewatering zone X, as in the conventional case. After being dehydrated by gravity, it is dehydrated by being sandwiched between the filter cloths 10 and 11 in the wedge zone, and then each roll 23 to 3
Press zone Z meanderingly arranged in an S-shape by 0
The water is dehydrated under pressure between the two filter cloths 10 and 11.
At this time, as the amount of material to be processed increases, the load applied to each drive roll 29, 30 increases, and the tension due to the driving force applied to each filter cloth 10, 11, especially the short inner filter cloth 11, increases. It's getting bigger. When a load exceeding a predetermined value is applied, the torque limiter 50 operates, the inner filter cloth drive roll 29 is no longer driven, and no tension is applied to the inner filter cloth 11 due to the driving force. Therefore, excessive tension is not applied to the inner filter cloth 11, and wrinkles do not occur in the lacing portion of the inner filter cloth 11.
It becomes possible to continue driving smoothly. In this case, only the outer filter cloth driving roll 30 is driven, and although the cake water content is reduced by 0.5 to 1% in dewatering performance, the operation can be continued reliably.

"Effects of the Invention" As explained above, in the present invention, the inner filter cloth drive roll is provided with a torque limiter that stops the drive when the load applied to the inner filter cloth drive roll exceeds a set value. With this torque limiter, when a load larger than a set value is applied to the inner filter cloth drive roll, the drive of the inner filter cloth drive roll is stopped and the tension applied to the inner filter cloth is suppressed to a small level, thereby reducing the lacing part. It has excellent effects such as being able to prevent the occurrence of wrinkles, allowing smooth operation, and not causing a significant decrease in dewatering performance.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention, in which Figure 1 is a sectional view of the end of the inner filter cloth drive roll, Figure 2 is an overall configuration diagram of the belt press type dehydrator, and Figure 2 is a cross-sectional view of the end of the inner filter cloth drive roll. Figure 3 is an explanatory diagram of each drive roll part, Figure 4 is an explanatory diagram of the filter cloth drive part, Figure 5 is an explanatory diagram of the lacing part of the filter cloth, and Figure 6 is a state in which wrinkles have occurred in the lacing part of the filter cloth. FIG. 10... Outer filter cloth, 11... Inner filter cloth, 29... Inner filter cloth drive roll, 30... Outer filter cloth drive roll, 5
0...Torque limiter.

Claims (1)

[Scope of utility model registration request] A belt press type dehydrator that has an inner filter cloth driving roll and an outer filter cloth driving roll, a pair of endless filter cloths are wrapped around each of them, and slurry is supplied between both filter cloths for continuous dewatering, A load-responsive belt press type dehydrator, characterized in that the inner filter cloth drive roll is provided with a torque limiter that stops driving when the load applied to the inner filter cloth drive roll exceeds a set value.