JP5709312B2 - Mixer discharge gate - Google Patents

Description

  The present invention relates to a discharge gate of a mixer that performs mixing adjustment by introducing various materials, and particularly relates to a discharge gate of a mixer having excellent sealing performance.

  A mixer is generally used to mix and adjust various materials. For example, when manufacturing an asphalt mixture which is a road pavement material, a predetermined amount of various materials such as heat-dried aggregate, stone powder, and molten asphalt are charged into a mixing tank such as a twin-screw mixer and the like. The desired asphalt mixture is produced by mixing and stirring for a period of time. And the asphalt mixture manufactured in this way is discharged | emitted from the discharge gate provided in the bottom part of the mixing tank at any time, and is prepared for manufacture after the following batch.

  The discharge gate is composed of a discharge port for discharging the mixture opened at the bottom of the mixing tank, and a gate lid capable of opening and closing the discharge port. When mixing materials, the gate lid is closed by an air cylinder or the like. Then, while the mixing process is performed with the discharge port closed, when the mixture after the mixing process is discharged, the gate lid is opened to discharge the mixture with the discharge port opened.

  Various types can be adopted as the discharge gate, and, for example, as shown in Patent Document 1 (Japanese Utility Model Publication No. 56-31839), the cross section faces the discharge port at the bottom of the mixing tank. A rotary discharge gate configured to pivotally support a substantially half-moon-shaped gate lid and open and close the discharge port according to the pivoting movement of the gate lid; No. 57446) and Patent Document 3 (Japanese Utility Model Publication No. 57-42661) have a plate-like gate lid that substantially coincides with the discharge port at the bottom of the mixing tank, and is supported outside the mixing tank. The gate lid is attached to the gate shaft through a gate arm, and the gate shaft is rotated by an air cylinder or the like so that the gate lid is rotated around the gate shaft to open and close the discharge port. There are gates.

  In addition, the discharge gates of the types shown in Patent Document 2 and Patent Document 3 are structurally easier to take a wider opening area than the rotary discharge gate shown in Patent Document 1, and therefore the mixture is relatively It can be discharged in a short time, and for example, it is considered that it is possible to appropriately cope with a case where the shipping speed of the mixture is required as in the case of producing an asphalt mixture or the like.

Japanese Utility Model Publication No. 56-31839 Japanese Utility Model Publication No. 3-57446 Japanese Utility Model Publication No.57-42661

  By the way, in the discharge gate arrange | positioned at the mixing tank bottom part of a mixer, in combination with the above discharge performance of a mixture, etc., in order to prevent the leakage of the material at the time of a mixing process, a discharge port and a gate cover are high. For example, in the discharge gate having the structure shown in Patent Document 2, the mixture adheres and remains not a little at the discharge port and the peripheral edge of the gate lid as the mixture is discharged. It is also conceivable that the adhered matter may be bitten when the gate lid is closed, and in this case, there is a concern that the material may leak without maintaining sufficient sealing performance.

  On the other hand, the discharge gate having the structure shown in Patent Document 3 has a structure in which one end edge of the gate lid always opens and closes while sliding with one end edge of the discharge port. Therefore, at least one end of the gate lid or the discharge port. Although it can be expected to suppress deposits on the edge and reduce biting when the gate lid is closed, the gate structure is relatively complex, such as the use of a link mechanism. It is considered disadvantageous.

  In view of the above-mentioned points, the present invention has an object to provide a mixer discharge gate capable of suppressing deposits at the time of closing a gate lid while suppressing deposits on the discharge gate while the apparatus configuration is simple and inexpensive. To do.

  In order to solve the above-mentioned problem, in the discharge gate of the mixer according to claim 1 according to the present invention, a discharge port for discharging the mixture is opened at the bottom of the mixing tank of the mixer, and the discharge port is provided rotatably. A discharge gate of the mixer configured to open and close the discharge port with the gate lid so that the upper surface of the gate shaft fixed integrally with the base edge of the gate lid faces the mixing tank The gate shaft is pivotally supported along the side edge of the discharge port, and the outer periphery of the gate shaft is covered with a substantially arc-shaped shaft liner that protects the gate shaft from wear during the mixing process. A seal liner that seals against the outer peripheral surface of the shaft liner is fixed to the side edge portion, and the shaft liner outer peripheral surface of the gate shaft that rotates as the gate lid is closed is scraped off by the seal liner. Remove deposits on the outer peripheral surface of the shaft liner Is characterized by being configured to prevent biting when the chain.

  The mixer discharge gate according to claim 2 is characterized in that the fixing position of the seal liner can be adjusted forward and backward with respect to the shaft liner.

  The mixer discharge gate according to claim 3 is characterized in that the contact portion of the seal liner with the shaft liner is formed in a substantially arc shape so as to be in surface contact with the outer peripheral surface of the shaft liner. .

  Further, in the mixer discharge gate according to claim 4, the seal liner is formed in a substantially flat plate shape and disposed so as to be sandwiched between the side edge of the discharge port and the outer peripheral surface of the shaft liner. It is characterized in that it is configured such that the portion is brought into contact with the outer peripheral surface of the shaft liner and sealed.

  According to the discharge gate of the mixer according to claim 1 of the present invention, the side edge portion of the discharge port so that the gate shaft fixed integrally with the base end edge portion of the gate lid faces the upper surface portion in the mixing tank. The outer periphery of the gate shaft is covered with a substantially arc-shaped shaft liner that protects the gate shaft from abrasion during the mixing process, while the side edge of the discharge port A seal liner that seals against the outer peripheral surface of the shaft liner is fixed, and the shaft liner outer peripheral surface of the gate shaft that rotates as the gate lid is closed is scraped with the seal liner to attach the shaft liner outer peripheral surface. Since the kimono is removed to prevent biting when the gate lid is closed, the gate lid can be securely closed while the device configuration is simple and inexpensive, and the sealing performance of the gate is stable. Can be maintained well.

  Further, according to the discharge gate of the mixer according to claim 2, when the sealing position of the seal liner can be adjusted to advance and retreat with respect to the shaft liner, the shaft liner and the seal liner are worn and the sealing performance is lowered. However, the sealing performance can be easily recovered to a good state by adjusting the fixing position of the seal liner to advance or retreat.

  According to the discharge gate of the mixer according to claim 3, the contact portion of the seal liner with the shaft liner is formed in a substantially arc shape so as to be in surface contact with the outer peripheral surface of the shaft liner. The contact area of the liner can be increased to improve the sealing performance, and the progress of wear can be distributed almost evenly on the entire circumferential surface of the seal liner and shaft liner. It is.

  According to the discharge gate of the mixer according to claim 4, the seal liner is formed in a substantially flat plate shape and is disposed so as to be sandwiched between the side edge portion of the discharge port and the outer peripheral surface of the shaft liner. Since the flat part of the shaft is in contact with the outer peripheral surface of the shaft liner for sealing, the device configuration is simple and can be kept cheaper, and the shaft liner and the seal liner are worn and the sealing performance is reduced. Even in this case, the sealability can be easily recovered to a good state by adjusting the seal liner to advance and retreat.

It is a cross-sectional front view which shows one Example of the discharge gate of the mixer which concerns on this invention. It is a principal part enlarged view of FIG. It is a figure corresponded in FIG. 2 of another Example.

  In the discharge gate of the mixer according to the present invention, a discharge port for discharging the mixture is opened at the bottom of the mixing tank of the mixer for mixing and adjusting various materials, and a gate cover provided rotatably at the discharge port. The discharge gate is configured to open and close the discharge port. Further, the gate shaft fixed integrally with the base end edge portion of the gate lid is pivotally supported along the side edge portion of one end of the discharge port so that the upper surface portion thereof faces the mixing tank. At the same time, the outer peripheral portion of the gate shaft exposed to the mixing tank is covered with a substantially arc-shaped wear-resistant shaft liner in order to protect the gate shaft from wear during the mixing process.

  Further, a seal liner that abuts and seals the outer peripheral surface of the shaft liner is fixed to the discharge port side edge in the vicinity of the shaft liner, and the shaft liner outer peripheral surface of the gate shaft that rotates as the gate lid is closed. The seal liner is scraped off each time to remove the adhering matter on the outer peripheral surface of the shaft liner that has adhered and remained when the mixture is discharged, thereby preventing biting when the gate lid is closed.

  In addition, the position of the seal liner that adheres to the side edge of the discharge port can be adjusted forward and backward with respect to the shaft liner so that it can be easily accommodated during initial installation and when each liner is worn. In addition, the seal liner is formed in a substantially arc shape that approximates the outer diameter of the shaft liner so that the contact portion of the seal liner with the shaft liner can be brought into surface contact with the substantially arc-shaped outer peripheral surface of the shaft liner.

  And, in the case of producing an asphalt mixture, for example, with a mixer having a discharge gate having the above-described configuration, first, the gate lid is closed with an air cylinder or the like to close the discharge port, and then installed separately. Aggregate of various particle sizes heat-dried with a dryer, etc., various materials such as stone powder, molten asphalt, etc. are put into a mixing tank of the mixer in predetermined amounts, and mixed and stirred for a predetermined time to obtain a desired asphalt mixture. To manufacture. Then, open the gate lid with an air cylinder etc. to open the discharge port, discharge and ship the manufactured asphalt mixture, close the gate lid again to close the discharge port, Prepare for the production of asphalt mixtures.

  At this time, as the asphalt mixture is discharged, the mixture adheres to the discharge port of the discharge gate and the peripheral edge of the gate lid, but the deposit on the shaft liner covering the gate shaft at the base edge of the gate lid The seal liner arranged so as to come into contact with the outer peripheral surface of the shaft liner can be scraped every time the gate lid is closed, thereby preventing biting when the gate lid is closed and ensuring the gate closing. Although the device configuration is simple and inexpensive, the sealing performance of the discharge gate can be maintained stably and satisfactorily.

  In addition, even when a gap is generated due to wear at the portion where the shaft liner or the seal liner abuts and the sealing performance is lowered, the sealing performance can be easily adjusted by adjusting the fixing position of the sealing liner with respect to the shaft liner forward and backward as appropriate. It can recover to a good state. In addition, since the seal liner and the shaft liner are formed in a substantially arc shape that approximates the contact portions of the seal liner and the shaft liner so that they can always come into surface contact, the seal liner can have a wide contact area and the sealing performance can be improved. In addition, even if wear occurs, it can be distributed substantially evenly over the entire circumferential surface of the seal liner and shaft liner without causing uneven wear, thus extending the life of the seal liner and shaft liner and maintaining it in terms of maintenance. It is advantageous.

  In place of the above apparatus configuration, for example, the seal liner is formed in a substantially flat plate shape and disposed so as to be sandwiched between the side edge of the discharge port and the outer peripheral surface of the shaft liner, and the flat portion of the seal liner is It can also be configured to seal against the outer peripheral surface of the shaft liner, and with such a simple configuration, the device cost can be kept lower, and the seal liner can be adjusted to advance and retract appropriately even when wear occurs. The sealing property can be easily restored to the original good state.

  Thus, according to the discharge gate of the mixer according to the present invention, the gate shaft of the gate lid is pivotally supported along the side edge of the discharge port so that the upper surface of the gate shaft faces the mixing tank. The outer periphery of the gate shaft is covered with a wear-protecting shaft liner, and a seal liner is fixed to the side edge of the discharge port so as to be pressed against the outer peripheral surface of the shaft liner and sealed. The shaft liner outer peripheral surface of the gate shaft that rotates with the closing operation of the gate lid is scraped off each time with the seal liner to remove deposits on the outer surface of the shaft liner, preventing biting when the gate lid is closed As a result, the device configuration is simple and advantageous in terms of maintenance and cost, but the gate lid can be reliably closed, the gate sealing performance can be kept stable and good, and adhesion is likely to occur. Mixing mixer To discharge the gate of the tank can be suitably adopted.

  An embodiment of the present invention will be described below with reference to FIGS.

  Reference numeral 1 in the figure denotes a biaxial mixer used for mixing and adjusting an asphalt mixture, for example, which penetrates two parallel mixing shafts 3 in a mixing tank 2 composed of two twin cylinders. These are rotatably supported by bearings (not shown) fixed to the mixing tank 2. A large number of arms 4 are radially arranged on the mixing shaft 3 in the radial direction, and a mixing blade 5 having an appropriate angle is attached to the tip of each arm 4. Each mixing shaft 3 is a drive motor. As shown by the arrow in FIG. 1 at (not shown), it rotates in the opposite direction. In addition, an abrasion-resistant liner 6 is stuck on the inner wall surface of the mixing tank 2 to protect the inner wall of the mixing tank 2 from wear and the like when the asphalt mixture is mixed.

  In this embodiment, a description will be given with a biaxial mixer as the mixer. However, the present invention is not limited to this. For example, a single mixing shaft is passed through a mixing tank formed of a single body. The same can be applied to a single-shaft mixer or the like.

  A discharge port 7 for discharging the asphalt mixture is opened in parallel to the mixing shaft 3 at the bottom of each cylinder of the mixing tank 2, and a gate lid 8 for opening and closing the discharge port is formed at the side edge of the discharge port 7. , And the gate lid 8 is rotated as indicated by the arrow in the drawing in accordance with the expansion and contraction drive of the piston rod of an air cylinder (not shown) provided in the vicinity of the gate lid 8. The discharge gate 9 is configured to open and close the discharge port 7.

  Further, the upper surface portion of the gate shaft 10 fixed integrally with the base end edge portion of the gate lid 8 faces the mixing tank 2, and the outer diameter portion of the gate shaft 10 is substantially flush with the inner wall surface of the bottom portion of the mixing tank 2. In this manner, it is pivotally supported along the side edge (at the outer position of the mixing tank 2 in the figure) at one end of the discharge port 7 and at least the mixing tank 2 in the outer peripheral portion of the gate shaft 10. The upper surface exposed to the inside is covered with a substantially arc-shaped wear-resistant shaft liner 11 so that it can be protected from wear during the mixing process.

  The gate shaft 10 at the base edge of the gate lid 8 is pivotally supported along the discharge port 7 side edge so that its upper surface faces the mixing tank 2 as described above. By configuring as described above, the height space required for opening and closing the gate lid 8 (the turning radius of the gate lid 8) can be slightly suppressed as compared to the discharge gate having the configuration shown in Patent Document 2, for example, Even when it is employed in an existing asphalt plant with restrictions on the height space or the like, it can be suitably employed.

  In addition, a wear-resistant gate liner 12 is also attached to the inner wall surface of the gate lid 8 in the same manner as the mixing tank 2, and the left and right mixing shafts are located in the center of the bottom of the mixing tank 2 located between the gate lids 8. A wear-resistant liner 13 formed in a substantially mountain shape along the rotation trajectory of each mixing blade 5 is fixed to protect the wall surface from abrasion.

  A seal liner 14 that is brought into contact with the outer peripheral surface 11a of the shaft liner 11 to be sealed against the outer peripheral surface 11a of the gate liner 11 is fixed to the edge of the gate liner 10 in the vicinity of the shaft liner 11 by fixing bolts 15. As shown in FIG. 2, the inner peripheral surface 14a of the seal liner 14 that is in contact with the shaft liner 11 is surface-contactable with the substantially arc-shaped outer peripheral surface 11a of the shaft liner 11. 11 is formed in a substantially arc shape approximating the outer diameter of 11. Further, the seal liner 14 is provided with a slit 16 having a predetermined length for inserting the fixing bolt 15, and is used for initial adjustment or wear of the shaft liner 11 and the seal liner 14 in FIG. As indicated by the arrows, the fixing position of the seal liner 14 with respect to the shaft liner 11 is appropriately advanced and retracted so that it can be easily handled.

  On the other hand, when the gate lid 8 is closed, the free end portion of the gate lid 8 abuts against the mountain-shaped liner 13 on the side edge (at the inner side of the mixing tank 2 in the figure) at the other end of the discharge port 7. The seal liner 17 to be sealed is fixed by a fixing bolt 18 and a slit 19 having a predetermined length is formed in the seal liner 17 for inserting the fixing bolt 18 in the same manner as described above. Or, when the mountain-shaped liner 13 or the seal liner 17 is worn, etc., as indicated by the arrows in FIG. .

  And when manufacturing an asphalt mixture with the mixer 1 provided with the discharge gate 9 of the said structure, first, after driving an air cylinder and closing the gate cover 8 and closing the discharge port 7, it installs separately. Aggregates of various particle sizes heat-dried with a dryer, etc., various materials such as stone powder and molten asphalt, etc., are put into the mixing tank 2 of the mixer 1 in a predetermined amount and mixed and stirred for a predetermined time to obtain the desired asphalt. A mixture is produced. Then, the gate lid 8 is opened by the air cylinder to open the discharge port 7, and the manufactured asphalt mixture is discharged and shipped, and then the gate lid 8 is closed again to close the discharge port 7. Prepare for the production of asphalt mixtures after batch.

  At this time, as the asphalt mixture is discharged, the mixture adheres to the discharge port 7 of the discharge gate 9 and the peripheral portion of the gate lid 8, but to the shaft liner 11 that covers the gate shaft 10 at the base edge of the gate lid 8. As shown in FIG. 2, the adhering material can be scraped off every time the gate lid 8 is closed by the seal liner 14 arranged so as to be in surface contact with the outer peripheral surface 11a of the shaft liner 11. It is possible to prevent the biting when the gate lid 8 is closed to ensure the closing of the gate, and to maintain the sealing performance of the discharge gate 9 stably and satisfactorily. Further, even when the shaft liner 11 and the seal liner 14 come into contact with each other and wear is generated, and a gap is generated between the liners, and the sealing performance is deteriorated, the fixing bolt 15 is loosened to make the seal liner 14 into the slit 16. By appropriately adjusting the movement along the shaft liner 11 side, the sealing property can be easily restored to the original good state.

  Further, since the inner peripheral surface 14a of the seal liner 14 and the outer peripheral surface 11a of the shaft liner 11 are formed in a substantially arc shape having substantially the same diameter, the contact area of the seal liner 14 can be widened to improve the sealing performance. In addition, it is possible to prevent uneven wear even when wear occurs, and to disperse the entire inner peripheral surface 14a of the seal liner 14 and the outer peripheral surface 11a of the shaft liner 11 substantially uniformly. The life of the liner 11 is extended, which is advantageous in terms of maintenance.

  Thus, according to the discharge gate 9 of the mixer 1 according to the present invention, the gate shaft 10 of the gate lid 8 is rotated along the side edge portion of the discharge port 7 so that the upper surface portion thereof faces the mixing tank 2. The outer periphery of the gate shaft 10 is covered with a shaft liner 11 for preventing wear, and the side edge of the discharge port 7 is pressed against the outer peripheral surface 11 a of the shaft liner 11. The seal liner 14 to be contacted and sealed is fixed, and the shaft liner outer peripheral surface 11a of the gate shaft 10 that rotates in accordance with the closing operation of the gate lid 8 is scraped off by the seal liner 14 each time. 11a is removed to prevent biting when the gate lid 8 is closed, so that the configuration of the apparatus is relatively simple and advantageous in terms of maintenance and cost, but the gate lid 8 can be securely closed. To do Can be can be stably satisfactorily maintained by the sealing of the discharge gate 9, suitably used also to discharge the gate of the mixing tank such as, for example, prone asphalt mixer or concrete mixer attachment.

  FIG. 3 shows the discharge gate of the mixer according to the second embodiment of the present invention. The same components as those in the first embodiment shown in FIG. Omitted.

  In the discharge gate 9 ′ of the mixer 1 of the present embodiment, the support material 20 for supporting the seal liner is slightly inclined toward the discharge port 7 at the edge of the mixing tank 2 at the bottom of the discharge port 7. On the other hand, a seal liner 14 ′ formed in a substantially flat plate shape is disposed along the inclined surface of the support member 20 and fixed by a fixing bolt 15 ′, and the tip of the seal liner 14 ′ is fixed. The portion is sandwiched between the side edge of the discharge port 7 and the outer peripheral surface 11 a of the shaft liner 11, and the front end faces the inside of the mixing tank 2 so as to be substantially flush with the liner 6 that covers the inner wall of the mixing tank 2. . Further, the seal liner 14 'is provided with a slit 16' having a predetermined length for inserting the fixing bolt 15 '. During initial adjustment or when the shaft liner 11 or the seal liner 14' is worn, etc. As indicated by the arrows in FIG. 3, the fixing position of the seal liner 14 ′ is adjusted forward and backward as appropriate so that it can be easily handled.

  In the discharge gate 9 ′ having the above-described structure, the structure is simpler and the apparatus cost can be reduced, and the seal liner 14 ′ can be adjusted appropriately in accordance with the degree of wear even when wear occurs. Thus, the sealing property can be easily recovered to a good state.

DESCRIPTION OF SYMBOLS 1 ... Mixer 2 ... Mixing tank 6 ... Liner (for inner wall of mixing tank) 7 ... Discharge port 8 ... Gate lid 9, 9 '... Discharge gate 10 ... Gate shaft 11 ... Shaft liner 11a ... Shaft liner outer peripheral surface 12 ... Liner (gate) (For lid)
14, 14 '... seal liner 14a ... inner surface of seal liner

Claims (4)

  A mixer discharge gate configured to open a discharge port for discharging a mixture at a bottom portion of a mixing tank of the mixer, and to open and close the discharge port with a gate lid rotatably provided at the discharge port. The gate shaft fixed integrally with the base end edge of the lid is pivotally supported along the side edge of the discharge port so that the upper surface of the gate shaft faces the mixing tank, and the outer periphery of the gate shaft is While covering with a substantially arc-shaped shaft liner that protects the gate shaft from wear during the mixing process, a seal liner that abuts the outer peripheral surface of the shaft liner and seals is fixed to the side edge of the discharge port, The shaft liner outer peripheral surface of the gate shaft that rotates with the closing operation of the gate lid is scraped with the seal liner to remove deposits on the outer peripheral surface of the shaft liner, thereby preventing biting when the gate lid is closed. Mixer discharge gate characterized by that.   2. The mixer discharge gate according to claim 1, wherein the fixing position of the seal liner can be adjusted forward and backward with respect to the shaft liner.   The mixer discharge gate according to claim 1 or 2, wherein a contact portion of the seal liner with the shaft liner is formed in a substantially arc shape so as to be in surface contact with the outer peripheral surface of the shaft liner.   The seal liner is formed in a substantially flat plate shape so as to be sandwiched between the side edge of the discharge port and the outer peripheral surface of the shaft liner, and the flat portion of the seal liner is brought into contact with the outer peripheral surface of the shaft liner for sealing. 3. The mixer discharge gate according to claim 1, wherein the mixer discharge gate is configured as described above.

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