JP4223384B2 - Internal pressure rise prevention device for closed mixer - Google Patents

Description

  The present invention relates to an internal pressure rise prevention device for a closed mixer, for example, a Banbury mixer.

  Conventionally, for example, when modifying or vulcanizing rubber or the like, an additive substance such as a carbon filler is added and the rubber is kneaded. In this case, as shown in FIG. A so-called Banbury mixer 100 which is a closed kneader is used.

  The Banbury mixer 100 includes a mixer chamber 102, and the mixer chamber 102 includes two rotors 104 and 106.

  Then, the powdery raw rubber supplied from a hopper (not shown) is heated in the mixer chamber 102, and the ram cylinder 108 that can move up and down is lowered to knead the rubber while being pressurized to a constant pressure. It has become.

  However, when such raw materials are supplied to the mixer chamber 102, air containing dust, oil mistakes, etc., is discharged to the outside by the amount of the input, causing dust generation and polluting the surrounding environment. It is a cause.

  Further, when the raw material powder is kneaded by the Banbury mixer 100, the pressure inside the mixer chamber 102 fluctuates due to vertical movement of the ram cylinder 108, water vapor, etc., and air flows in and out of the mixer chamber 102. In this case as well, air is discharged to the outside, causing dust generation and polluting the surrounding environment.

  For this reason, it is conceivable that the mixer chamber 102 has a completely sealed structure. However, in this case, the internal pressure of the mixer chamber is not constant due to a temperature rise during kneading.

  In the case of such a sealed structure, the internal pressure of the mixer chamber 102 repeatedly fluctuates, and the shaft seal or the like is damaged and damaged, and the machine itself is also damaged.

  Further, in the case of a sealed structure, when the raw material is supplied to the mixer chamber 102, the internal pressure of the mixer chamber 102 increases abruptly by an amount corresponding to the input capacity. Therefore, the rotors 104 and 106, the shaft seal Etc. may be damaged, and the machine itself may be damaged.

  For this reason, conventionally, although the input part 110 of the Banbury mixer 100 is not shown in the drawing, the structure does not intentionally close for several millimeters, and a method of sucking dust coming out from it with a dust collector is employed.

  However, even with such a method, the shaft seal and the like due to fluctuations in internal pressure, and the risk of dust outflow are not sufficient, and a complicated configuration such as a dust collector is necessary, and the dust collector discharges the powder. The loss of powder is large and the cost is increased.

In view of such a current situation, the present invention can prevent environmental pollution caused by the outflow of dust, oil mist, etc. generated at the time of raw material charging and kneading in a closed mixer, and reduce the loss and cost of raw materials. In addition, the internal pressure of the mixer chamber can be suppressed, kneading can be carried out under constant pressure kneading conditions, and further, the shaft seal for driving the mixer can be prevented from being damaged. An object of the present invention is to provide an internal pressure rise prevention device for a mixer.

The present invention has been made in order to achieve the above-described problems and objects in the prior art, and the internal pressure rise prevention device for a closed mixer according to the present invention is an internal pressure rise prevention device for a closed mixer. And
An air bag for pressure adjustment which is disposed at an upper side position of the mixer chamber of the mixer and is freely expandable and contractible;
The pressure adjusting air bag, and a chute that communicates with the mixer chamber,
When the internal pressure in the mixer chamber rises, the gas in the mixer chamber flows into the air bag through the chute and expands the air bag, thereby reducing the pressure in the mixer chamber to a predetermined pressure. ,
When the internal pressure in the mixer chamber is lowered, the gas in the air bag is returned to the mixer chamber through the chute so that the air bag is contracted to increase the pressure in the mixer chamber to a predetermined pressure. Configured,
Thus, the pressure in the mixer chamber is maintained constant.

  With this configuration, when the internal pressure in the mixer chamber rises, the gas in the mixer chamber flows into the air bag via the chute, and the air bag is inflated, so that the pressure in the mixer chamber is predetermined. The pressure can be lowered to

  In addition, when the internal pressure in the mixer chamber decreases, the gas in the air bag is returned to the mixer chamber through the chute and the air bag is contracted to increase the pressure in the mixer chamber to a predetermined pressure. Can do.

  Therefore, the air bag functions as a so-called internal pressure buffering chamber.When the internal pressure rises when the raw material is charged, when the internal pressure rises or falls due to temperature, water vapor, etc. during kneading, the internal pressure fluctuates. However, the pressure in the mixer chamber can always be maintained at a constant predetermined pressure, a constant kneading condition can be obtained, and a product with a constant quality can be obtained.

  In addition, dust, oil mist, etc. generated at the time of raw material charging and kneading will stay in the air bag, preventing it from flowing out of the device and preventing environmental pollution due to outflow of dust, etc. Can be prevented, and the cost can be reduced.

  Furthermore, since fluctuations in the internal pressure of the mixer chamber can be suppressed, breakage of the shaft seal for driving the mixer and the like can be prevented when the raw materials are charged and kneaded.

Further, in the internal pressure rise prevention device of the closed mixer according to the present invention, a chute that communicates the air bag and the mixer chamber has an inclination angle and is connected to the mixer chamber.
The powder component contained in the gas flowing into the air bag from the mixer chamber is configured to return to the mixer chamber through a chute.

  By comprising in this way, the granular component contained in the gas which flowed into the air bag from the mixer chamber returns (returns) to the mixer chamber via the chute, so that the granular component (dust) etc. Raw material loss due to outflow can be prevented, and cost can be reduced.

  Also, the internal pressure rise prevention device of the closed mixer according to the present invention is such that a top plate member is mounted above the airbag body of the airbag, and a constant gap is maintained in the airbag body even when the airbag body contracts. It is comprised so that it may be carried out.

  By configuring in this way, the air gap body is held by the top plate member even when the air bag body contracts, so that the air bag body is blocked and the above-described buffering action is hindered. Thus, the above function can be always stably realized without causing an abnormal increase in the mixer internal pressure.

  Moreover, the internal pressure rise prevention device of the closed mixer according to the present invention is characterized in that the top plate member is configured to move up and down in accordance with the expansion and contraction of the air bag.

  As described above, the top plate member can be moved up and down in accordance with the expansion and contraction of the air bag, so that the expansion and contraction of the air bag is not hindered. It is.

  Further, the internal pressure rise prevention device of the closed mixer according to the present invention is such that a branch duct is connected to the airbag, and the gas flowing into the airbag exceeds the capacity of the airbag. A part of the gas is discharged to the outside through the branch duct.

  By configuring in this way, when the raw material is supplied more than the planned input amount, or when the internal pressure rises abnormally, etc., when there is an inflow of gas exceeding the capacity of the air bag, Since the air bag is discharged through the branch duct without being damaged, the function of the internal pressure rise prevention device of the closed mixer is not hindered.

  Further, in the internal pressure rise prevention device of the closed mixer according to the present invention, the branch duct is made of a flexible material and is connected to a negative pressure source, so that the branch duct is normally blocked by negative pressure. It is configured to be in a state.

  By configuring in this way, normally, the suction force due to the negative pressure by the negative pressure source does not act on the air bag via the branch duct, thereby preventing the internal pressure of the mixer chamber from being lowered. Can do.

  Moreover, the internal pressure rise prevention device of the closed mixer according to the present invention is characterized in that the branch duct is configured to be movable up and down as the air bag expands and contracts.

  By configuring in this way, the branch duct follows the expansion and contraction of the airbag, the branch duct comes off from the airbag, dust flows out from the airbag, the internal pressure decreases, The internal pressure will not fluctuate.

  Moreover, the internal pressure rise prevention device of the closed mixer according to the present invention is characterized in that the air bag is subjected to antistatic treatment.

  By configuring in this way, the powder component adheres to the inner wall of the air bag due to the action of static electricity, and the reflux of the powder component to the mixer chamber is not hindered. It is possible to prevent the air bag from being blocked and the buffering action from being inhibited.

  According to the present invention, it is possible to prevent environmental pollution caused by outflow of dust, oil mist, etc. generated when mixing raw materials in a closed mixer, and reduce raw material loss and cost, and the internal pressure of the mixer chamber Fluctuation can be suppressed, kneading can be carried out under a kneading condition of a constant pressure, and breakage of the shaft seal for driving the mixer can be prevented.

  Hereinafter, embodiments (examples) of the present invention will be described in more detail with reference to the drawings.

  FIG. 1 is a front view of an internal pressure rise prevention device for an internal mixer according to the present invention, FIG. 2 is an arrow view in the direction A of the internal pressure rise prevention device for the internal mixer of FIG. 1, and FIG. FIG. 4 is a schematic diagram for explaining the state after feeding the raw material of the internal pressure rise prevention device for the hermetic mixer of the present invention.

  In FIG. 1, reference numeral 10 denotes an internal pressure rise prevention device (hereinafter referred to as “internal pressure rise prevention device 10”) of the closed mixer of the present invention as a whole. In this embodiment, as an example, an embodiment applied to a Banbury mixer for kneading rubber or the like is shown.

  The internal pressure rise prevention device 10 includes a mixer body 14 installed on a floor 12 of a factory or the like, and a mixer chamber 16 is formed inside the mixer body 14. Inside the mixer chamber 16, rotors 22 and 22 that rotate in opposite directions are rotated around the two shafts 18 and 18 by the rotational driving force of the drive motor 20 connected to the shafts 18 and 18. It is pivotally supported.

  A ram cylinder 24 is mounted above the mixer chamber 16 so as to be movable up and down by a piston cylinder mechanism (not shown).

  Further, as shown in FIGS. 3 and 4, a raw material charging hopper 26 is disposed at an upper side position of the mixer chamber 16, and the raw material charging hopper 26 passes through the raw material charging chute 27. Thus, a certain amount of raw material powder, for example, a rubber raw material powder to which an additive substance such as a carbon filler is added can be put into the mixer chamber 16.

  On the other hand, a pressure adjusting air bag 28 that can be inflated and contracted is disposed at a position on the upper side of the mixer chamber 16 on the side opposite to the raw material feeding hopper 26. The pressure adjusting air bag 28 includes a substantially cylindrical air bag body 30 made of a material that can be expanded and contracted, and a substantially disk-shaped top plate member 32 connected to the upper portion of the air bag body 30.

  With this configuration, the air gap body 30 is held by the top plate member 32 even when the air bag body 30 contracts, so that the air bag body 30 is closed, and a buffer described later is provided. The function is not hindered and an abnormal increase in the internal pressure of the mixer does not occur, and it is possible to always realize the function stably.

  Although not shown, a mounting portion is provided in a cylindrical shape on the airbag main body 30, and the top plate member 32 is attached to the airbag main body by inserting the top plate member 32 into the mounting portion and squeezing the attachment string. The upper part of 30 can be attached.

The lower end of the airbag main body 30 is connected to a hopper portion 36 of a chute 34 via a connecting member 32 such as a band made of an elastic member such as rubber. In addition, this airbag mounting part is round and has no sharp protrusions so that the airbag is not damaged, has a roundness,
It is protected by a rubber plate or the like, and has a structure in which a tensile force is applied to the whole.

  On the other hand, the pressure adjusting chamber 37 inside the airbag main body 30 of the pressure adjusting airbag 28 and the mixer chamber 16 are communicated by the chute 34.

  As shown in FIG. 1, the chute body 38 of the chute 34 has an inclination angle α and is connected to the mixer chamber 16.

  The chute body 38 is preferably cylindrical, and is preferably 1/3 to 1/2 of the diameter of the airbag body 30, and the inclination angle α is set as large as possible. It is desirable that the granular material (dust) contained in the gas flowing into the back body 30 can drop (reflux) into the mixer chamber 16 by gravity. In consideration of such an action, it is preferably 50 to 70 degrees although it depends on the kind of powder.

  In addition, it is desirable that the attachment portion of the chute body 38 to the mixer chamber 16 has a structure that adheres to the mixer, does not leak dust, and does not retain powder.

  The material of the chute 34 may be determined according to the material to be fed into the mixer chamber 16, the dust to be ejected, the fumes, and the properties of the product, and is not particularly limited. In consideration of dropping (refluxing) to 16, it is generally preferable to use a plate of SUS304, SUS316, a surface roughness of 10S or less, and a thickness of 1 to 3 mm.

  On the other hand, the top plate member 32 of the pressure adjusting airbag 28 is connected to the fixed portion 48 by a wire member 46 via a pulley 44 that is disposed on the ceiling 40 of the factory and suspended by a bracket 42. .

  By configuring in this way, the top plate member 32 is configured to be movable up and down as the airbag main body 30 expands and contracts, so that the expansion and contraction of the airbag main body 30 are hindered. Since there is no such thing, it is possible to always realize the buffer action described later stably.

  Further, the top plate member 32 is installed at a high place such as a ceiling. However, as described above, the top member 32 is lifted up to a predetermined position by the wire member 46 so that it is not necessary to work at a high place every time the airbag body is replaced. It has become. That is, by extending the wire member 46, the airbag main body is lowered, and the replacement work is performed in a low place. One end of the wire member 46 is removed, and the place where the top plate member 32 has come down is removed and replaced at the airbag attachment portion of the chute 34.

  The material of the airbag body 30 is not particularly limited as long as it is a material that does not allow gas such as air to pass therethrough and has an effect of preventing static electricity generation. Specifically, for example, double-sided static electricity of nylon tarpaulin. A countermeasure product is inexpensive, effective, and suitable.

  That is, since the air bag body 30 is subjected to antistatic treatment, the powder component adheres to the inner wall of the air bag body 30 due to the action of static electricity, and the powder component returns to the mixer chamber 16. It is possible to prevent the air bag body 30 from being blocked by the powder component and from inhibiting the buffering action described later.

Further, the capacity of the air bag body 30 needs to be larger than the amount of gas (air) discharged by the mixer. For example, when 100 kg of carbon having a bulk specific gravity of 0.3 is put into the mixer chamber 16. , 300L capacity is required. As in this embodiment, if the mixer is attached to the ram cylinder 24, a capacity corresponding to the amount of air moved by the vertical movement of the ram cylinder 24 is required.

  Further, the shape of the air bag main body 30 is substantially cylindrical, and it is desirable to determine the diameter according to the above-mentioned capacity by utilizing the height that can be created under the mixer installation conditions.

  Further, a branch duct 50 is connected to the airbag body 30, and when the gas flowing into the airbag body 30 exceeds the capacity of the airbag body 30, a part of the gas in the airbag body 30 is It is configured to be discharged to the outside through the branch duct 50.

  By configuring in this way, when the raw material is supplied more than the planned input amount, or when the internal pressure is abnormally increased, etc., when there is an inflow of gas exceeding the capacity of the airbag body 30 In addition, since the air bag body 30 is discharged through the branch duct 50 without being damaged, the function of the internal pressure rise prevention device 10 is not hindered.

  The branch duct 50 is made of a flexible material such as PVC and is connected to a negative pressure source (not shown) so that the branch duct 50 can be bent easily. It is comprised so that it may be in the state obstruct | occluded by the negative pressure.

  With this configuration, the suction force due to the negative pressure by the negative pressure source does not act on the airbag main body 30 via the branch duct 50 at normal times, so that the internal pressure of the mixer chamber 16 decreases. Can be prevented.

  Further, as shown in FIG. 1, it is desirable that the branch duct 50 is configured to be movable up and down as the airbag main body 30 expands and contracts.

  With this configuration, the branch duct 50 follows the expansion and contraction of the airbag main body 30, the branch duct 50 is detached from the airbag main body 30, dust flows out from the airbag main body 30, and internal pressure This prevents the internal pressure of the mixer chamber 16 from fluctuating.

  In this case, it is desirable that the branch duct 50 has a structure including a bone such as a spring member so that it does not easily collapse. The movable range is a range that moves up and down as the airbag body 30 expands and contracts. As the suction amount, it is desirable that the air amount is not less than the shortage amount of the airbag capacity.

  As shown in FIGS. 3 and 4, the internal pressure rise prevention device 10 of the present invention configured as described above operates as follows.

  First, as shown in FIG. 3, before the raw material powder B is introduced from the raw material charging hopper 26 into the mixer chamber 16, the airbag body 30 is in a state of being normally contracted by suction of the branch duct 50. It has become.

Then, when the raw material powder B is charged into the mixer chamber 16 from the raw material charging hopper 26, when the ram cylinder 24 is lowered for kneading, or due to a temperature rise during kneading, the mixer chamber 16 When the internal pressure rises, as shown in FIG. 4, the gas in the mixer chamber 16 flows into the air bag body 30 through the chute 34 and expands the air bag body 30. The pressure in the mixer chamber 16 can be lowered to a predetermined pressure.

  Further, when the ram cylinder 24 is raised or when the internal pressure in the mixer chamber 16 is lowered due to a temperature drop or the like, the gas in the air bag body 30 is returned to the mixer chamber 16 via the chute 34. As shown in FIG. 3, the pressure in the mixer chamber 16 can be increased to a predetermined pressure by contracting the airbag main body 30.

  Therefore, the air bag body 30 functions as a so-called internal pressure buffering chamber. When the internal pressure rises when the raw material is charged, the internal pressure rises and falls due to temperature, water vapor, etc. during kneading, and the internal pressure fluctuates. At the same time, the pressure in the mixer chamber 16 can always be maintained at a constant predetermined pressure, a constant kneading condition can be obtained, and a product with a constant quality can be obtained.

  In addition, dust, oil mist, and the like generated during kneading when the raw materials are charged are retained in the air bag body 30 and can prevent environmental pollution due to the outflow of dust and the like without flowing out of the apparatus. Loss can be prevented, and the cost can be reduced.

  Further, since fluctuations in the internal pressure of the mixer chamber 16 can be suppressed, breakage of the shaft seal for driving the mixer and the like can be prevented when the raw materials are charged and kneaded.

  In addition, a chute 34 that communicates between the airbag main body 30 and the mixer chamber 16 has an inclination angle and is connected to the mixer chamber, whereby the gas flowing into the air bag main body 30 from the mixer chamber 16 is contained in the gas. The contained powder component is refluxed to the mixer chamber 16 via the chute 34.

  As a result, the powder component contained in the gas flowing into the air bag body 30 from the mixer chamber 16 returns (returns) to the mixer chamber 16 via the chute 34, so that the powder component (dust) or the like The loss of the raw material due to the outflow can be prevented, and the cost can be reduced.

  The rubber or the like after the kneading is taken out from the mixer chamber 16 through a take-out port (not shown).

  Note that the present invention is not limited to the above-described embodiment, and in the above-described embodiment, an example in which the present invention is applied to a Banbury mixer for kneading rubber or the like as the internal pressure rise prevention device 10 has been shown. In addition to examples, it can be applied to kneading foods such as synthetic resins such as polyolefin and cereal flour, and is not limited to Banbury mixers, but can be a pressure type kneader or other closed type mixers. Needless to say, the invention can be applied and various changes can be made without departing from the scope of the present invention.

FIG. 1 is a front view of an internal pressure rise prevention device for a closed mixer according to the present invention. 2 is a view in the direction of arrow A of the internal pressure rise prevention device of the hermetic mixer of FIG. FIG. 3 is a schematic diagram illustrating a state before the raw material of the internal pressure rise prevention device of the closed mixer according to the present invention is charged. FIG. 4 is a schematic diagram for explaining the state after the raw material of the internal pressure rise prevention device of the closed mixer according to the present invention is charged. FIG. 5 is a front view of an internal pressure rise prevention device of a conventional hermetic mixer.

Explanation of symbols

10 Internal pressure rise prevention device 12 Floor 14 Mixer body 16 Mixer chamber 18 Shaft 20 Drive motor 22 Rotor 24 Ram cylinder 26 Raw material charging hopper 27 Raw material charging chute 28 Pressure adjusting air bag 30 Air bag main body 32 Top plate member 34 Chute 36 Hopper part 37 Pressure adjustment chamber 38 Chute body 40 Ceiling 42 Metal fitting 44 Pulley 46 Wire member 48 Fixed part 50 Branch duct 100 Banbury mixer 102 Mixer room 104 Rotor 108 Ram cylinder 110 Input part B Raw material powder α Inclination angle

Claims (8)

An internal pressure rise prevention device for a closed mixer,
An air bag for pressure adjustment which is disposed at an upper side position of the mixer chamber of the mixer and is freely expandable and contractible;
The pressure adjusting air bag, and a chute that communicates with the mixer chamber,
When the internal pressure in the mixer chamber rises, the gas in the mixer chamber flows into the air bag through the chute and expands the air bag, thereby reducing the pressure in the mixer chamber to a predetermined pressure. ,
When the internal pressure in the mixer chamber is lowered, the gas in the air bag is returned to the mixer chamber through the chute so that the air bag is contracted to increase the pressure in the mixer chamber to a predetermined pressure. Configured,
In this way, the internal pressure rise prevention device for a closed mixer is configured to maintain a constant pressure in the mixer chamber. A chute that communicates the air bag and the mixer chamber has an inclination angle and is connected to the mixer chamber.
2. The hermetic mixer according to claim 1, wherein the granular component contained in the gas flowing into the air bag from the mixer chamber is returned to the mixer chamber through a chute. The internal pressure rise prevention device.   The top plate member is mounted above the air bag body of the air bag, and the air bag body is configured to maintain a certain gap even when the air bag body contracts. The internal pressure rise prevention device of the closed mixer according to any one of 1 to 2.   The apparatus for preventing an increase in internal pressure of a hermetic mixer according to claim 3, wherein the top plate member is configured to be movable up and down as the air bag expands and contracts.   A branch duct is connected to the airbag, and when the gas flowing into the airbag exceeds the capacity of the airbag, a part of the gas in the airbag is discharged to the outside through the branch duct. The apparatus for preventing an increase in the internal pressure of the hermetic mixer according to any one of claims 1 to 4, wherein the apparatus is configured to be configured as described above.   The branch duct is made of a flexible material and is connected to a negative pressure source so that the branch duct is normally closed by a negative pressure. Item 6. The internal pressure rise prevention device for a closed mixer according to Item 5.   The apparatus for preventing an increase in internal pressure of a hermetic mixer according to any one of claims 5 to 6, wherein the branch duct is configured to move up and down as the air bag expands and contracts.   The apparatus for preventing an increase in internal pressure of a hermetic mixer according to any one of claims 1 to 7, wherein the air bag is subjected to antistatic treatment.

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