JP2017144400A - Filter cloth for oscillation shaking-off type dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide filter cloth for an oscillation type shaking-off type dust collector capable of reducing the number of holes opened through filter cloth by shaking a cake off.SOLUTION: Filter cloth is used for an oscillation type shaking-off type dust collector, the filter cloth being the filter cloth for an oscillation type shaking-off type dust collector comprising a hollow part enclosed by the filter cloth, where this hollow part has a filter cloth body extending in a longitudinal direction, a connection part provided in the filter cloth body to transmit oscillation generated in the oscillation generator of the dust collector to the filter cloth body, and an elastic part provided in a direction crossing the longitudinal direction of the filter cloth body to prevent creases of the filter cloth body.SELECTED DRAWING: Figure 1

Description

The present invention relates to a filter cloth for a dust collector used when collecting dust from a gas containing dust.

Dust collectors are broadly divided into vibration-off type, counter-pressure type, and pulse jet type, depending on the type of dust-off. The vibration dusting dust collector does not require compressed air, and can be used for a small to relatively large dust collector. The vibration dusting dust collector is used, for example, for casting, cupola, aluminum melting furnace, silo air venting and the like.

For example, Patent Document 1 describes a dust collector filter cloth including a fine fiber layer formed of fine fibers finer than fibers of a filter cloth base material. Since the stress applied to the fine fiber layer becomes small, it is said that it is excellent in durability against bending wear caused by the filter cloth for the dust collector being bent at the time of dust removal.

Patent Document 2 describes that an abrasion-resistant coating such as silicon resin is applied to the filter cloth. It is described that, by this, wear resistance can be imparted to the filter cloth and the life can be extended.

JP 2014-151293 A JP 2012-91099 A

In the dust collector, dust accumulates as a cake on the filter surface side of the filter cloth. Since the pressure loss increases as the cake accumulates, it is necessary to periodically wipe off the cake. In a vibration dusting type dust collector, vibration is generated by a vibration generator, this vibration is transmitted to the filter cloth, and the filter cloth is vibrated to wipe off the cake.

When the filter cloth is vibrated, a part of the filter cloth is bent and becomes wrinkles. Each time the cake is wiped off, there is a tendency for wrinkles to occur at the same position on the filter cloth, and stress concentrates on the wrinkle portion, and the filter cloth tends to have holes.

An object of the present invention is to provide a filter cloth for a vibration duster type dust collector capable of reducing the number of holes perforated by the cake.

A filter cloth used in a vibration dusting dust collector, the filter cloth having a hollow portion surrounded by the filter cloth, and the filter cloth body having a shape in which the hollow portion extends in the longitudinal direction, and the filter cloth It is fixed to the filter cloth main body in a state extending in the direction intersecting the longitudinal direction of the filter cloth main body, and a connecting portion that is provided in the main body and transmits the vibration generated by the vibration generator of the dust collector to the filter cloth main body. The above-mentioned problem is solved by a filter cloth for a vibration dusting dust collector having an elastic part for preventing wrinkles of the filter cloth body. By arranging the elastic portion, wrinkles are less likely to occur in the filter cloth body. As a result, it is possible to make it difficult for the filter cloth body to be perforated.

The elastic part is preferably in the form of a strip. By making the elastic part into a band shape, it is possible to prevent the filtration efficiency from being lowered by the elastic part.

The tensile stress of the elastic part is preferably smaller than the tensile stress of the filter cloth body when it is pulled under the same conditions. The residual elongation of the elastic part is preferably 0 to 1.8%. The residual elongation was measured using an elastic test piece having a width of 5.0 cm and a length of 20.0 cm, a gripping tool spacing of 10.0 cm, a tensile speed of 1.0 cm / min, and a gripping tool moving distance of 5.0 mm. It is the residual elongation of the test piece when it is stretched 10 times under the conditions. The connection part between the vibration generator and the filter cloth body is provided on the upper side of the filter cloth body, the position of the connection part is 100%, and the fixing part between the dust collector and the filter cloth body provided on the lower end side of the filter cloth body is provided. When the position is 0%, the fixing portion is preferably provided at a position of 0 to 45%. As a result, wrinkles can be made less likely to occur in the filter cloth body.

The elastic portion preferably includes a base material made of an elastic material and a knitted fabric fixed to at least the surface of the base material. By arranging the knitted fabric on the substrate, the needle hole can be hidden by the knitted fabric when the elastic portion is pulled. Thereby, it is possible to prevent dust from leaking from the needle hole.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to reduce the number of the holes drilled in a filter cloth by cake removal in the filter cloth for vibration dusting type dust collectors.

It is a front view of the bag filter which concerns on one Embodiment of the filter cloth of this invention. It is sectional drawing of the AA part of the bag filter of FIG. FIG. 2 is a cross-sectional view of the B-B-A portion of the bag filter of FIG. It is a schematic diagram which shows the use condition of the bag filter of FIG. It is a schematic diagram which shows the structure of the test apparatus used by the durability test.

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

FIG. 1 shows a filter cloth 1 for a vibration dusting dust collector according to an embodiment of the present invention. The filter cloth 1 has a filter cloth body 11 having a hollow portion surrounded by the filter cloth. The filter cloth main body 11 has a cylindrical shape, and its hollow portion extends in the longitudinal direction. The filter cloth main body 11 is configured by overlapping and sewing one side and the other side in the longitudinal direction of the filter cloth. For this reason, the sewn line 13 appears in the longitudinal direction of the tubular filter cloth 1.

One end side of the filter cloth main body 11 includes a tapered portion 12. The taper portion 12 has a gradually tapered shape. The tip of the filter cloth body 11 is sewn to the filter cloth body 11 with a sewing line 15 in a state of being folded back toward the other end, and the tip is closed. The tip of the filter cloth main body 11 forms an annular portion 14 for inserting a dust collector fixture 24 to be described later.

The other end side of the filter cloth main body 11 is an opening communicating with the hollow portion, and a fixture 16 for the dust collector is attached to the filter cloth around the opening. In the present embodiment, as shown in FIG. 2, the fixture 16 includes an annular body 17 that can be elastically deformed and a pocket 18 for housing the annular body 17. The pocket 18 is made of a filter cloth that is thinner than the filter cloth body 11, one end side thereof is in contact with one surface of the filter cloth body 11, the other end side is folded back to the other surface, and the other end side thereof The filter cloth constituting the pocket and the filter cloth constituting the filter cloth body 11 are fixed by the sewing line 30 in a state where the filter cloth is in contact with the other surface of the filter cloth body 11. In the present embodiment, the pocket 18 is made of a filter cloth thinner than the filter cloth body 11, but the pocket 18 may be made of the same filter cloth as the filter cloth body 11. The fixture is not limited to this embodiment, and may take other forms.

As shown in FIG. 1, the filter cloth body 11 includes an elastic portion 19 between one end side and the other end side. The elastic part 19 is provided in a direction perpendicular to the longitudinal direction of the filter cloth body 11 and has a strip shape. The elastic part 19 is a closed annular shape that is continuous in the circumferential direction of the filter cloth body 11, and divides the filter cloth body 11 into an upper part and a lower part. The elastic part 19 is fixed to the filter cloth body 11 by a sewing line 20.

The filter cloth body 11 having the above-described shape is used by being set in a dust collector 21 as shown in FIG. The dust collector 21 is a vibration wipe-off dust collector, and includes a vibration generator 22. The vibration generator 22 swings the swing shaft 23 to which the fixture 24 is fixed. The fixture 24 of the dust collector shown in FIG. 4 is constituted by a hook. The annular portion 14 disposed on one end side of the filter cloth body 11 is inserted through the fixture 24. The annular portion 14 serves as a connection portion that transmits the vibration generated by the vibration generator 22 of the dust collector 21 to the filter cloth body 11.

The opening on the other end side of the filter cloth main body 11 is airtightly fixed to the base portion 25 of the dust collector 21. The base part 25 of the dust collector shown in FIG. 4 is provided with a plurality of circular protrusions that rise from the edge of the circular through hole, and the fixture 16 of the filter cloth body 11 is fixed to the protrusions. The inside of the circular protrusion is an opening, and the dust-containing gas is configured to blow into the filter cloth. The fixture 16 is attached as follows, for example. The filter cloth body is fixed to the base 25 of the dust collector by elastically deforming the annular body 17 of the fixture 16 radially outward so that the annular body 17 is engaged with the circular protrusion on the dust collector side.

The dust collector 21 has a dust chamber 26 into which dust-containing gas flows. As shown by the arrows in FIG. 4, the gas flows from the inlet 36 of the dust chamber 26, passes through the filtration surface of the filter cloth body 11, and is discharged out of the dust collector. The dust-containing gas cannot move from the dust chamber 26 to the air chamber 27 unless it passes through the filtration surface. The cake is deposited inside the filter cloth body 11. By operating the vibration generator 22, the swing shaft 23 is swung to vibrate the filter cloth body 11. In the dust collector of FIG. 4, the X axis (oscillation shaft 23) is used as a rotation axis, and the oscillation shaft 23 swings back and forth with respect to the Z axis direction and swings up and down in the Y axis direction. As a result, the cake accumulated inside is collected in the hopper 28 and discharged out of the dust collector 21.

Since the filter cloth 1 of the present embodiment includes the elastic part 19 in the filter cloth body 11, the number of wrinkles generated in the filter cloth body 11 when the filter cloth body 11 is vibrated to wipe off the cake, and The number of holes caused by wrinkles can be reduced.

The filter cloth of this embodiment includes a belt-like elastic portion 19. The elastic portion has an annular shape that is closed with respect to the circumferential direction of the tubular filter cloth body 11, and divides the filter cloth body 11 into an upper part and a lower part. For this reason, for example, when the upper part of the filter cloth main body 11 is vibrated, the closed annular elastic portion 19 expands and contracts, and the generation of wrinkles at the lower part of the filter cloth main body 11 is effectively prevented.

The tensile stress of the elastic part is preferably smaller than the tensile stress of the filter cloth body when it is pulled under the same conditions. That is, it is preferable that the elasticity of the elastic portion is greater than the elasticity of the filter cloth body. As a result, when stress is applied to the filter cloth main body in order to wipe off the cake, the elastic part is pulled to reduce the number of wrinkles generated in the filter cloth main body and to reduce the number of holes generated in the filter cloth main body. Can do.

As for the stress at the time of tension, using a test piece of an elastic part having a width of 5.0 cm and a length of 20.0 cm, the distance between the grips is 10.0 cm, the pulling speed is 1.0 cm / min, and the grip is moved. Based on the stress when the test piece is stretched once under the condition of a distance of 5.0 mm. The stress value at the time of tension | pulling of the filter cloth used for a filter cloth main body is about 10-80 daN / 5cm. Therefore, the upper limit value of the stress at the time of tension of the elastic portion is, for example, preferably less than 80 daN / 5 cm, more preferably 70 daN / 5 cm or less, still more preferably 9 daN / 5 cm or less, and 5 daN / More preferably, it is 5 cm or less, and further preferably 3 daN / 5 cm or less. The lower limit value of the stress at the time of tension of the elastic part is preferably 0.01 daN / 5 cm or more. Thereby, it is possible to further reduce the number of wrinkles generated in the filter cloth body 11 by elastically deforming the elastic portion and the number of holes generated due to the wrinkles.

The residual elongation percentage of the elastic part is preferably 0 to 1.8%, more preferably 0 to 1.5%, and further preferably 0 to 0.9%. When residual elongation occurs in the filter cloth main body due to the cake-wiping operation, the filter cloth main body becomes longer in the longitudinal direction, causing wrinkles. By configuring the elastic portion with a material having a residual elongation rate within the above range, it is possible to suppress the residual elongation and further reduce the number of wrinkles generated in the filter cloth main body 11 and the number of holes generated due to the wrinkles. . However, the residual elongation was measured using elastic specimens with a width of 5.0 cm and a length of 20.0 cm, a gripping tool spacing of 10.0 cm, a gripping tool pulling speed of 1.0 cm / min, and a gripping tool travel distance. It is the residual elongation when the test piece is stretched 10 times under the condition of 5.0 mm.

In the filter cloth 1 of this embodiment, the connection part of the vibration generator 22 and the filter cloth main body 11 is provided in the upper end side of the filter cloth main body 11, and the fixing part of the dust collector 21 and the filter cloth main body 11 is a filter cloth main body. Is provided on the lower end side of the. 1, the position of the connection portion between the vibration generator 22 on the upper end side and the filter cloth body 11 is 100%, and the position of the fixing portion between the dust collector on the lower end side and the filter cloth body is 0. %, The elastic portion is preferably provided at a position of 0 to 45%, more preferably provided at a position of 0 to 30%, and further preferably provided at a position of 0 to 18%. Thereby, the elastic part can be pulled and the number of wrinkles generated in the filter cloth body 11 and the number of holes generated due to the wrinkles can be further reduced.

The elastic portion can be made of, for example, a woven fabric rich in elasticity such as a satin weave fabric or a twill weave fabric, or an elastic resin material. Examples of the elastic resin material include foamed resins such as chloroprene rubber foam or silicone resin foam, or elastomers such as chloroprene rubber or silicone resin. The elastic resin material is preferably a sheet-like material. Chloroprene rubber can be suitably used for applications in which the temperature of the dust-containing gas is 130 ° C. or less. On the other hand, the silicone resin can be suitably used for applications in which the temperature of the dust-containing gas exceeds 130 ° C., for example, in applications where the temperature of 180 ° C. is continuous and the instantaneous temperature reaches 300 ° C. Can be used.

Compared to a woven fabric, an elastic resin material has a small residual elongation and is rich in elasticity. Therefore, the elastic part is preferably made of an elastic resin material. By configuring the elastic part with an elastic resin material, the residual elongation rate of the elastic part itself can be reduced. Thereby, the dimensional change of the elastic part when a filter cloth is used over a long period of time can be prevented. Furthermore, by constituting the elastic part with an elastic resin material, the residual elongation generated in the filter cloth body when the filter cloth is used for a long period of time is reduced by the expansion and contraction of the elastic part, thereby preventing the dimensional change of the filter cloth body. be able to.

In the filter cloth 1 of this embodiment, the elastic part 19 is sewn and fixed to the filter cloth body 11. When the cake deposited on the filter cloth body 11 is wiped off, stress is repeatedly applied to the filter cloth. In order to prevent the needle holes from spreading, it is preferable to fix the knitted fabric to at least the surface of the elastic resin material as the base material. This can prevent the needle hole from spreading due to stress. In addition, even if the needle hole is widened, the knitted fabric can prevent dust from leaking. Furthermore, since the knitted fabric is rich in stretchability, it is preferable that the stretch of the elastic resin material is hardly hindered.

In the filter cloth 1 of the present embodiment, the filter cloth body 1 is made of a nonwoven fabric, but may be made of a woven cloth. The filter cloth used for the vibration-discharging filter cloth needs to be flexible because the filter cloth is deformed by vibration. For this reason, it is preferable to use a woven fabric having a basis weight of 200 to 350 g / m ² . However, for example, when shot blasting is performed in a foundry, metal dust is generated. Since the metal dust has a small average particle size and high particle fluidity, the leakage of dust becomes a problem in a filter cloth made of woven fabric. In such a use, it is preferable to comprise a filter cloth main body from the nonwoven fabric with a fabric weight of 360-600 g / m < ² >.

If the basis weight of the filter cloth body is set large, the filtration efficiency of dust having a small particle diameter can be increased. However, since the flexibility of the filter cloth body decreases when the basis weight increases, it becomes easy to make a hole at a location around 30 cm from the base of the dust collector. Since the filter cloth 1 of the present embodiment is provided with the elastic portion 19, even if the basis weight is as large as 360 to 600 g / m ^2, the opening of the hole can be effectively prevented. The filter cloth of this embodiment can be particularly suitably used for applications that are easy to perforate for reasons such as such low flexibility.

By configuring the elastic part in a strip shape, the influence of the elastic part on the filtration efficiency can be reduced. For example, when the elastic body is made of foamed resin or the like, the elastic portion does not exhibit the filtering ability. From such a viewpoint, the length of the elastic portion with respect to the longitudinal direction of the filter cloth body is preferably, for example, 30 mm to 300 mm.

Hereinafter, the present invention will be described more specifically with reference to examples of the filter cloth of the present invention.

[Example 1]
A cylindrical filter cloth having the shape shown in FIG. 1 was produced using the filter cloth shown below as the material of the filter cloth main body and the elastic sheet shown below as the material of the elastic portion.

The filter cloth constituting the filter cloth body is configured by laminating and fixing a base cloth, a surface layer, and a back layer. The base fabric is a woven fabric formed by weaving warps and wefts composed of polyethylene terephthalate. The surface layer and the back layer are felt layers formed by entanglement of polyethylene terephthalate fibers with a needle punch. This filter cloth has a thickness of 1.61 mm and a basis weight of 509 g / m ² .

The elastic sheet which comprises an elastic part sticks a knitted fabric on the surface and back surface of the foam sheet of chloroprene rubber. Jersey fabric was used as the knitted fabric. In Table 2, this elastic sheet was described as “CR + knitted fabric”. This elastic sheet has a thickness of 3.82 mm and a basis weight of 1028 g / m ² .

The produced cylindrical filter cloth has a length in the longitudinal direction of 1760 mm and an inner diameter of the cylindrical portion of 127 mm. In the filter cloth of this example, a belt-like elastic part was disposed at a position 0 mm from the lower end of the filter cloth body, that is, the position of the fixing part between the dust collector and the filter cloth body. The position where the elastic part is arranged is the distance from the fixed part between the dust collector and the filter cloth body to the lower edge of the belt-like elastic part. The same applies to the following examples and comparative examples. The elastic portion extends in a direction perpendicular to the longitudinal direction of the cylindrical filter cloth, and has an annular shape that is continuous and closed in the circumferential direction of the cylinder. And an elastic part is a dimension of 50 mm in the longitudinal direction of a filter cloth.

[Examples 2 to 8]
Example 2 in the same manner as the filter cloth of Example 1, except that the length in the longitudinal direction of the filter cloth body, the configuration of the elastic part, the position where the elastic part is arranged, and the respective changes were made as described in Table 1. Or the filter cloth which concerns on Example 8 was produced. The woven fabrics 1 to 3 used in Examples 6 to 7 have the following configurations.

Woven fabric 1
Warp and weft: Nylon texture: 1/7 twill horizontal weave weight: 663 g / m ²
Thickness: 1.42mm

Woven cloth 2
Warp and weft: Polyethylene terephthalate, Spun yarn Structure: 5 sheets satin weave,
Per unit weight: 326 g / m ²
Thickness: 0.55mm

Woven cloth 3
Warp and weft: Polyethylene terephthalate, Filament yarn Structure: 2/3 twill weave Weight: 286 g / m ²
Thickness: 0.44mm

[Comparative Example 1]
A filter cloth was produced with the same configuration as in Example 1 except that the filter cloth body was not provided with an elastic portion and the length of the filter cloth body in the longitudinal direction was changed to 1780 mm.

Durability evaluation tests were performed on the filter cloths according to Examples 1 to 8 and the filter cloth according to Comparative Example 1. The evaluation test was performed using the apparatus shown in FIG.

The apparatus 4 in FIG. 5 includes a fixture having a protrusion 41 that imitates the circular protrusion of the base of the dust collector, a swing shaft 42 that simulates the swing axis of the dust collector, and a hook 43 that simulates the dust collector hook. A drive source (not shown) that swings the swing shaft, a horizontal support 44 that supports the swing shaft in a swingable manner, and a vertical support 45 that fixes the horizontal support 44. . The horizontal struts 44 are fixed by fasteners 46, and the height of the horizontal struts 44 can be changed by loosening the fasteners 46. The amplitude of the oscillating shaft 42 is 30 mm in the Y-axis direction and 75 mm in the Z-axis direction in FIG.

The filter cloths according to Examples 1 to 8 and Comparative Example 1 were attached to the apparatus 4 described above, and durability was evaluated. The filter cloth is fixed by fitting the annular body 17 of the fixture 16 on the other end side of the filter cloth main body to the lower body portion of the concave groove of the circular protrusion 41 of the device 4 and fixing it to the hook 43 of the device 4. On the other hand, the filter cloth body was fixed through an annular portion 14 on one end side. The concave groove functions as a mechanism for preventing the filter cloth from falling off. When fixing the filter cloth, fix the filter shaft 42 in a horizontal state so that the distance from the lower end of the protrusion 41 to the support point of the hook 43 matches the length of each filter cloth in the longitudinal direction. The filter cloth body was fixed without wrinkles. For example, in Example 1, it fixes so that the distance from the lower end of the protrusion 41 to the support point of the hook 43 may be 1760 mm, and the lower end of a filter cloth and the lower end of the protrusion 41 correspond.

After the rocking shaft was swung 100 times, the rocking shaft was inclined 15 mm toward the depression angle side, and the presence or absence of wrinkles generated on the filter cloth body and the number of wrinkles were visually confirmed. The measurement results are summarized in Table 1. The number of scissors was counted by dividing into a section of 0 or more and less than 300 mm, a section of 300 or more and less than 600 mm, and a section of 600 mm or more and less than 1000 mm, based on the position of the fixed portion on the lower side of the filter cloth. In addition, the presence or absence of wrinkles generated in the elastic part was also confirmed visually.

Next, a test piece is cut out from the raw fabric having the same configuration as the filter cloth main body and the elastic part used in each of the above Examples and Comparative Examples, and the elastic body is subjected to 5% tensile stress and residual elongation. Was determined by the following method. That is, the upper 5.0 cm and the lower 5.0 cm of each test piece having the dimensions shown in the following measurement conditions were held with a gripper. The gripping tool on the upper side of the test piece was displaced by 5.0 mm at the tensile speed indicated in the measurement conditions. The stress value at this time was taken as the stress value at the time of 5% tension. This tensile operation was repeated 10 times, and the residual elongation at the 10th tension was determined. The residual elongation was determined based on the amount by which the gripper was displaced without increasing the stress value.

The measurement conditions are as follows. Table 2 summarizes the obtained stress value at 5% tension and the residual elongation. In addition, about the stress value at the time of 5% tension, the stress value is different in the vertical direction and the horizontal direction, but in the filter cloths of Examples 1 to 5, the direction in which the stress value is small coincides with the longitudinal direction of the filter cloth body. The elastic body is cut out from the original fabric. In the filter cloths of Examples 6 to 8, the elastic body is cut out from the raw fabric so that the longitudinal direction coincides with the longitudinal direction of the filter cloth body.
(Measurement condition)
Dimension of test piece: width 5.0 cm and length 20.0 cm
Gap spacing: 10cm
Tensile speed 1.0cm / min Movement distance of gripper: 5.0mm
Elongation: 1 (stress measurement during tension)
Elongation frequency: 10 times (residual elongation rate)

As shown in Table 1, it was confirmed that in Comparative Example 1 having no elastic portion, as many as 12 wrinkles were formed on the filter cloth body. When this wrinkle was observed, the filter cloth was bent and bent, and it was confirmed that a wrinkle was formed at the same location each time vibration was applied to the filter cloth. On the other hand, in Examples 1 to 8, the number of wrinkles formed on the filter cloth main body was 0 to 4, and the number of wrinkles clearly decreased. In particular, Example 1, Example 2, Example 5, and Example 7 were good results. As for Example 7, wrinkles occurred in the elastic part, but in Examples 1, 2 and 5, no wrinkle was observed including the elastic part. From Example 1, Example 2, and Example 5, it was confirmed that the number of wrinkles tends to decrease when the position of the elastic part is close to the fixing part of the filter cloth body.

The elastic body of Example 6 has a residual elongation of 2.0% in both the vertical direction and the horizontal direction. On the other hand, the stress value at 0.5% tension of the elastic body is 14 daN / 5 cm in the longitudinal direction and 8 daN / 5 cm in the lateral direction. Therefore, the elastic body of Example 6 is rich in elasticity compared with the filter cloth body. However, in the filter cloth of Example 6, four wrinkles occurred. From this, it was confirmed that when the residual elongation percentage of the elastic body is high, the number of wrinkles tends to increase. In Examples 1 to 5 and Example 7, both the stress value at 0.5% tension and the residual elongation are small. In these examples, the number of wrinkles was small. Similarly to the elastic bodies of Examples 1 to 5, the silicone foam sheet having a low stress value and a low residual elongation also had a small number of wrinkles.

When a filter cloth having the same configuration as that of Comparative Example 1 was set in a dust collector and actually tested for durability, it was confirmed that the filter cloth would have a hole in the filter cloth when used for about three months. It was. From this, it was confirmed that wrinkles generated in the filter cloth were the cause of perforation. According to the present invention, since the number of wrinkles generated when the cake is wiped off can be reduced, the possibility of perforation can be reduced and the durability of the filter cloth can be improved.

Next, using the test apparatus 4 described above, the elongation ratio of the elastic part, the elastic partial load ratio, and the expansion ratio of the filter cloth body when the filter cloth of each example and the filter cloth of the comparative example are expanded and contracted are expressed by the following equations. Determined by The results are shown in Table 3.
1) Amount of change of elastic part = length of elastic part at expansion−length of elastic part at contraction 2) Elongation rate of elastic part = (change of elastic part ÷ length of elastic part at contraction) × 100
3) Swing width of the swing shaft in the Y-axis direction = 30 mm
4) Elastic part ratio = change amount of elastic part / vibration width of swing axis in Y-axis direction × 100
5) Filter cloth main body expansion / contraction ratio = (swing width of swinging shaft in Y-axis direction−change amount of elastic portion) ÷ filtering cloth total length × 100

The time of contraction indicates the length of the elastic portion in a state where the swing shaft reaches the bottom dead center. “Elongation” indicates the length of the elastic portion in a state where the swing shaft reaches the top dead center. The elastic partial load ratio indicates what percentage the elastic portion bears while the entire filter cloth extends 30 mm.

As is clear from Table 3, in the filter cloths of Examples 1 to 5, it was confirmed that the elastic portion bears a large amount of expansion and contraction, and the filter cloth main body hardly expands and contracts. In the filter cloths of Examples 1 to 5, the elastic part mainly expands and contracts, and the filter cloth body hardly expands and contracts, so that the load on the filter cloth body is small. For this reason, it is possible to reduce the residual elongation generated in the filter cloth body when the operation of repeatedly removing the cake over a long period of time is repeated. As a result, the dimensional change of the filter cloth body can be prevented, and the possibility of perforation can be further reduced.

DESCRIPTION OF SYMBOLS 1 Filter cloth 11 Filter cloth main body 19 Elastic part 21 Dust collector

Claims (6)

A filter cloth used in a vibration dusting dust collector,
The filter cloth has a hollow portion surrounded by the filter cloth, and the filter cloth body has a shape in which the hollow portion extends in the longitudinal direction,
A connecting portion that is provided on the filter cloth body and transmits the vibration generated by the vibration generator of the dust collector to the filter cloth body;
A filter cloth for a vibration dusting type dust collector having an elastic part that is fixed to the filter cloth body in a state extending in a direction crossing the longitudinal direction of the filter cloth body and prevents wrinkles of the filter cloth body. 2. The filter cloth for a vibration dusting type dust collector according to claim 1, wherein the elastic portion has a belt shape. The filter cloth for a vibration-discharging type dust collector according to claim 1 or 2, wherein when the elastic part is pulled under the same conditions, the stress is smaller than the stress when the filter cloth body is pulled. The filter cloth for a vibration dusting dust collector according to any one of claims 1 to 3, wherein a residual elongation of the elastic portion is 0 to 1.8%;
However, the residual elongation was measured by using an elastic test piece having a width of 5.0 cm and a length of 20.0 cm, a gripping tool spacing of 10.0 cm, a tensile speed of 1.0 cm / min, and a gripping tool moving distance. It is the residual elongation of the test piece when it is stretched 10 times under the condition of 0 mm. The connection portion between the vibration generator and the filter cloth body is provided on the upper side of the filter cloth body,
When the position of the connection part is 100%, and the position of the fixing part between the dust collector and the filter cloth body provided on the lower end side of the filter cloth body is 0%,
The filter cloth for a vibration dusting dust collector according to any one of claims 1 to 4, wherein the elastic portion is provided at a position of 0 to 45%. 6. The filter cloth for a vibration drop-off type dust collector according to claim 1, wherein the elastic body includes a base material made of an elastic resin material and a knitted cloth fixed to at least a surface of the base material.

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