JP4977370B2 - Material storage hopper arching breaker - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a material storage hopper to be discharged after temporarily storing various materials such as sand and other aggregates and other particles and powders, and in particular, an arching breaker for a material storage hopper that prevents arching of the storage material in the hopper. The present invention relates to (arching prevention device).

  For example, as a new casting technique, there is a vacuum freeze mold casting method. Mixing casting sand with water and placing it in a mold, freezing under reduced pressure to make a mold, and pouring molten steel into this mold will cause the mold to collapse naturally. There has been proposed a casting method in which mold release is possible, and the foundry sand after the mold release is returned to its original sand grain state and reused as foundry sand. In this casting method, it is necessary to provide a material storage hopper with a sieve that sifts the cast sand after mold release and returns it to the sand grain state, temporarily stores it in the hopper, and sends it to the next process. Become.

  By the way, the foundry sand stored in the hopper inevitably has a high water content in the process, so that it is poor in fluidity and tends to be compacted, and in some cases, arching may occur in the hopper, making it difficult to dispense. There is. In addition, as one of the means for stably discharging various storage materials with poor fluidity, the storage material in the hopper is forcibly agitated to improve fluidity and prevent arching of the storage material. There is an arching breaker (Patent Documents 1 and 2).

For example, Patent Document 1 proposes an agitating arching breaker provided at an upper position in a hopper and a screw-type arching breaker provided at a lower position. In this hopper device, the storage material is agitated by the upper agitating arching breaker to give appropriate fluidity, while the screw feeding arching breaker at the lower stage reverses the material transfer direction of the screw feeder at the lower end of the hopper. The storage material is fed in the direction to prevent the storage material in the hopper from being biased to one side on the screw feeder outlet side to prevent the hopper volumetric efficiency from being lowered.
JP 2004-353953 A JP 2005-29202 A

  By the way, the arching of the storage material in the hopper is caused by the storage material staying in the vicinity of the inner wall of the hopper outlet. If the storage material stays in the vicinity of the inner wall of the hopper, the arching can be suppressed. Therefore, the present inventors can smoothly flow down the storage material near the inner wall of the hopper, and suppress arching more effectively if it has a delivery function that collects the storage material to the center side of the hopper. I thought I could do it.

  An object of the present invention is to provide an arching breaker for a material storage hopper that effectively suppresses arching by allowing the storage material in the vicinity of the inner wall of the hopper to smoothly flow down and enables stable dispensing. .

In order to solve the above problems, the arch ring breaker material storage hopper according to claim 1, wherein according to the present invention, the material storage hopper having a screw feeder for the material fed to the bottom, the storage of the upper position of the screw feeder material A stirrer shaft is arranged in a direction orthogonal to the screw feeder at a location where arching is caused by compaction by the shaft and is rotatably supported by bearings provided on the left and right side walls of the hopper body. A drive motor that surrounds a plurality of feed blades each having a predetermined feed angle so that the storage material is fed to the center in the longitudinal direction of the stirring shaft while stirring the storage material. the provided, Smoothing the storage material by sending to the central side of the hopper body while disentangling the storage material by forward rotation of the stirring shaft by the drive motor Thus does not flow down into's configured to stably feed out the storage material in the screw feeder, in both end positions of the stirring shaft, the longitudinal direction of the stirring shaft storage material even when brought into normal and reverse rotation of the agitating shaft A feed blade having a substantially V-shaped cross section is attached so that the storage material is pressed against the inner wall of the hopper so as not to form arching. When arching occurs, the stirring shaft is reversed by the drive motor. It is characterized in that the arching is collapsed by rotating and applying a reverse force by the feed blade .

  An arching breaker for a material storage hopper according to claim 2 is characterized in that the stirring shaft can be rotated in reverse by a manual operation.

According to the arch ring breaker material storage hopper according to claim 1, wherein according to the present invention, the material storage hopper having a screw feeder for the material fed to the bottom, resulting in arching by consolidation by storage material of the upper level of the screw feeder A stirrer shaft is arranged at a position perpendicular to the screw feeder, and is rotatably supported by bearings provided on the left and right side walls of the hopper body. The storage material in the hopper is agitated on the outer periphery of the stirrer shaft. A plurality of feed blades each having a predetermined feed angle so as to feed toward the center in the longitudinal direction of the stirring shaft, and a drive motor that can rotate the stirring shaft in the forward and reverse directions. the stirring shaft smoothly passed down the storage material by sending to the central side of the hopper body while disentangling the storage material by forward rotation by scribing Together configured to stably feed out the storage material at Yufida, in both end positions of the stirring shaft, even feeding to the longitudinal center side of the stirring shaft storage material when brought into normal and reverse rotation of the stirring shaft, A feed blade having a substantially V-shaped cross section that prevents the arching from being formed by pressing the storage material against the inner wall of the hopper is attached. When arching occurs, the stirring shaft is reversely rotated by the drive motor and the feed blade is used. Since the arching is configured to collapse by applying a force in the reverse direction, the arching of the storage material can be effectively suppressed, and the storage material in the hopper can be discharged stably.

  According to the arching breaker of the material storage hopper according to claim 2 of the present invention, since the stirring shaft can be reversely rotated by manual operation, even if arching should occur, the hopper can be reversely rotated. The arching formed inside can be eliminated by collapsing.

  In the arching breaker of the material storage hopper according to the present invention, the stirring shaft is rotatably supported above the screw feeder at the lower end portion of the material storage hopper, and the material stored in the hopper on the outer periphery of the stirring shaft A plurality of feed blades that can be fed out along the stirring shaft are arranged in a spiral manner while being stirred. Each feed blade has its feed angle adjusted so that the feed direction of the material is reversed around the substantially central part of the stirring shaft, and when the stirring shaft is rotated forward, which is the rotation direction during normal operation. Is configured to feed the material around the stirring shaft to the center in the longitudinal direction of the stirring shaft, that is, to the center inside the hopper. A drive motor for rotating the agitation shaft at a predetermined speed is provided outside the hopper, and preferably the rotation direction can be switched between forward and reverse by manual operation.

  When a material having poor fluidity, such as foundry sand, is stored in the material storage hopper, for example, due to the properties of the material, compaction occurs near the bottom of the hopper, and an arch is formed. At this time, when the drive motor is driven and the stirring shaft of the arch breaker is rotated forward, the stored material is forcibly fed to the hopper center side, which is the stirring shaft center side, while being stirred and loosened by the feed blades. However, the storage material near the inner wall of the hopper flows down smoothly, and it becomes possible to effectively suppress the occurrence of arching in the hopper. As a result, the storage material in the hopper is stably stabilized by the screw feeder. Can be paid out.

  Even if the arching breaker is driven, if arching occurs, the drive motor is reversely rotated manually to reversely rotate the stirring shaft of the arching breaker. As a result, a force is applied from the feed blade to the arching formed around the stirring shaft from the opposite direction, and the arching can be collapsed as much as possible. After confirming that the arching is eliminated, the drive motor is returned to the normal rotation again by manual operation, and the stirring shaft of the arching breaker is returned to the normal positive rotation.

  In this way, the storage material near the hopper inner wall is made to flow smoothly by providing a feed mechanism that collects the storage material to the center side of the hopper while loosening the storage material, so that the formation of arching in the hopper effectively This makes it possible to suppress the storage material stably.

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

  Reference numeral 1 in the figure denotes a material storage hopper with a sieve that, for example, sifts foundry sand, returns it to a sand grain state, temporarily stores it, and sequentially dispenses it as necessary. The hopper body 2 is supported by a gantry 3 The hopper body 2 has an opening 4 that is open at the upper end, and a screw feeder 5 that sequentially dispenses the stored material is disposed at the lower end of the hopper body 2.

  In addition, the insertion opening 4 of the hopper body 2 is provided with a relatively large mesh size so as to cover the entire opening, and in this embodiment, a grid size 6 having a mesh size of 50 mm is provided. It is possible to remove foreign matters such as relatively large metal pieces mixed in the sand and large lump bodies that are not sufficiently crushed. Furthermore, a guide rail 7 for slidably storing a sieve frame, which will be described later, is appropriately disposed below the grind sleeve 6 of the hopper body 2.

  Reference numeral 8 denotes a sieve frame placed on the guide rail 7, and a sieve mesh 10 is stretched on a substantially rectangular frame body 9. For example, when collecting sand, a sieve mesh having a mesh size of 5 mm is used. To do. The sieving frame 8 may be easily handled by dividing the upper end opening area of the hopper body 2 into at least one so as to be easily attached and detached during maintenance. In the illustrated example, the upper end opening size of the hopper body 2 is 2 m. Since the size is about × 2 m, four sieving frames 8 each having a size of about 1 m × 1 m divided into four are used.

  At the lower part of the substantially four corners of the sieve frame 8, a wheel 11, preferably a rubber wheel that absorbs vibration of the sieve, is rotatably mounted and a handle 12 for advancing and retracting is attached. A vibrator 13 that applies vibration to the sieve frame 8 is fixed to the side surface of the sieve frame 8 to which the handle 12 is attached.

  Further, rubber cushioning materials 14 and 14 ′ for vibration isolation are fixed to both front and rear ends of the sieve frame 8, and the sieve frame 8 is slid and stored in the hopper body 2 along the guide rail 7. In some cases, cushioning materials 14 and 14 ′ are interposed in the contact portion between the frame body 9 of the sieve frame 8 and the hopper body 2 so that vibration from the vibrator 13 is not transmitted to the hopper body 2 as much as possible.

  On the other hand, an abutment plate 15 for abutting the rubber cushioning material 14 at the front end portion of the sieve frame 8 that is slidably housed along the guide rail 7 is disposed at the substantially central portion of the upper end opening of the hopper body 2. The hopper body 2 is provided with a fixing clamp 16 that fastens or fixes the sieve frame 8 by one-touch operation, and the rubber cushioning material 14 at the front end of the sieve frame 8 is brought into contact with the abutting plate 15 while the sieve frame 8 The squeeze frame 8 is fixed to the hopper body 2 by pressing the rubber cushioning material 14 ′ at the rear end portion toward the inner side of the hopper with the fixing clamp 16 and crushing it.

  An arching breaker 17 that prevents arching of the stored matter stored in the hopper body 2 is disposed above the discharge portion of the hopper body 2. The arching breaker 17 includes a sprocket 20 fixed to one end of the agitation shaft 19 while rotatably supporting the agitation shaft 19 with bearings 18 provided on the left and right side wall surfaces above the screw feeder 5 of the hopper body 2. And the drive sprocket 22 of the drive motor 21 provided in the vicinity is wound with the chain 23, and the stirring shaft 19 can be rotated at a predetermined speed by the drive of the drive motor 21. The drive motor 21 can be switched between forward and reverse directions by manual operation.

  A plurality of arms 24 are spirally arranged at appropriate intervals on the outer periphery of the agitation shaft 19, and when the agitation shaft 19 is rotated, the agitation shaft 19 is stirred while stirring the material stored in the hopper body 2. The feed blades 25 and 26 that are fed out along the line are fastened and fixed to the fixed arms 24 by bolts 27, respectively.

As shown in FIGS. 2 and 4, the flat plate-shaped feeding blade 25 is attached over a wide range at an intermediate position of the stirring shaft 19, and the material feeding direction is reversed with the substantially central portion of the stirring shaft 19 as a boundary. The feed angle of each feed blade 25 is adjusted so that When the agitation shaft 19 is rotated forward during normal operation (in the direction of the solid arrow in FIG. 4), the material around the agitation shaft 19 is moved to the longitudinal center of the agitation shaft 19, that is, inside the hopper body 2. It is sent out to the center side, so that the storage material near the inner wall of the hopper flows down smoothly so that no arching is formed. When the stirring shaft 19 is rotated in the reverse direction (in the direction of the dotted line arrow in FIG. 4), the material around the stirring shaft 19 is sent to both ends of the stirring shaft 19, that is, to the inner wall side of the hopper body 2. Even if one arch is formed, it can be easily broken down and eliminated.

Further, as shown in FIG. 2 and FIG. 4, the feed blades 26 having a substantially V-shaped cross section are attached one by one to both end positions of the stirring shaft 19, and when the stirring shaft 19 is rotated forward or backward. However, the surrounding storage material is sent to the longitudinal center of the shaft body 19, that is, to the central side inside the hopper body 2, so that the storage material is not pressed against the inner wall of the hopper to form an arch. .

  Next, handling of the material storage hopper 1 will be described. For example, when storing the cast sand after mold release, first, the vibrator 13 of the sieve frame 8 is driven to vibrate the sieve frame 8 and the cast sand after mold release is dispensed onto the grind 6 of the hopper body 2. . A relatively large foreign material such as a metal piece or a large lump that is not sufficiently crushed is removed by the grizzly 6 in the foundry sand.

  Next, the foundry sand that has passed through the grizzly 6 falls on the sieve mesh 10 of the sieve frame 8 located in the lower stage thereof, and is sieved by vibrations by the vibrator 13 to become sand particles and falls into the hopper body 2. It is collected in a reusable state. At this time, the vibration of the sieve frame 8 by the vibrator 13 is mostly absorbed by the rubber cushioning materials 14 and 14 ′ fixed to the sieve frame 8 and the rubber wheel 11, and the vibration to the hopper body 2. There is little transmission.

  The foundry sand stored in the hopper body 2 tends to form arching due to its poor fluidity and compaction, but when the stirring shaft 19 of the arching breaker 17 is rotated forward by the drive motor 21, The casting sand around the agitation shaft 19 is agitated and loosened by a large number of feed blades 25 and 26 provided around the shaft 19 and sent to the center side of the hopper body 2, so that the foundry sand near the inner wall of the hopper is also smooth. It flows down and is stably discharged from the lower screw feeder 5 without forming arching.

  On the other hand, in the unlikely event that arching occurs around the arching breaker 17 due to the influence of the properties of the foundry sand, the drive motor 21 of the arching breaker 17 is manually operated in reverse to reversely rotate the stirring shaft 19. . Due to the reverse rotation of the stirring shaft 19, reverse force is applied from the feed blades 25 and 26 to the arching formed around the stirring shaft 19, and the arching collapses. If it is confirmed that the arching is eliminated, the drive motor 21 is returned to the normal rotation, and the stirring shaft 19 of the arching breaker 17 is returned to the normal rotation which is a normal use state.

  Thus, even if the storage material stored in the material storage hopper 1 is poor in fluidity and easily causes arching, such as foundry sand, it is provided around the stirring shaft 19 around which the arching breaker 17 rotates. The storage material inside the hopper body 2 is forcibly agitated and sent out to the center side of the hopper body 2 by a large number of feed blades 25 and 26, and the storage material near the inner wall of the hopper flows down smoothly. As a result, the formation of arching can be effectively suppressed, and the storage material can be discharged stably.

  In this embodiment, the stirring shaft 19 of the arching breaker 17 is provided in a direction orthogonal to the screw feeder 5, but this is not a limitation. For example, the stirring shaft 19 may be provided parallel to the screw feeder 5. good.

  Further, in this embodiment, it is assumed that the casting sand after mold release is used as the storage material, and the upper end of the hopper body 2 can be removed so that foreign matter can be removed and crushed when the casting sand is stored in the hopper body 2. Although the material storage hopper 1 provided with the grizzly 6 or the sieve screen 10 in the part is used, the one provided with the arching breaker 17 is adopted, but the invention is not particularly limited to this, and the sieving device is not provided. It can be suitably employed for such ordinary material storage hoppers.

It is a front view which shows one Example of the material storage hopper which employ | adopted the arching breaker of the material storage hopper which concerns on this invention. It is a side view of FIG. It is a partially cutaway top view of FIG. FIG. 3 is an enlarged view of a main part of FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Material storage hopper 2 ... Hopper main body 5 ... Screw feeder 17 ... Arching breaker 19 ... Stirring shaft 21 ... Drive motor 24 ... Arm 25, 26 ... Feeding blade

Claims (2)

In the material storage hopper having a screw feeder for the material fed to the bottom, at a position resulting in arching by consolidation by storage material of the upper level of the screw feeder, the hopper body by placing a stirring shaft in a direction perpendicular to the screw feeder The bearings provided on the left and right side walls of the stirring shaft are rotatably supported, and a predetermined feed angle is set on the outer periphery of the stirring shaft so as to feed the storage material in the hopper to the central side in the longitudinal direction of the stirring shaft while stirring. Provided with a drive motor that surrounds a plurality of feed blades provided and that allows the agitation shaft to be rotated forward and backward, and rotates the agitation shaft in the forward direction by the drive motor to loosen the stored material, while at the center of the hopper body together configured to stably feed out the storage material at by flow down smoothly screw feeder the storage material by sending to the攪At both end positions of the shaft, even when the agitation shaft is rotated forward or backward, the storage material is sent to the center side in the longitudinal direction of the agitation shaft so that the storage material is not pressed against the inner wall of the hopper to form arching. When the feed blade having a substantially V-shaped cross section is attached, and arching occurs, the stirring shaft is reversely rotated by the drive motor and the reverse force by the feed blade is applied so that the arching is collapsed. A material storage hopper arching breaker.   2. The arching breaker for a material storage hopper according to claim 1, wherein the stirring shaft can be rotated in reverse by manual operation.

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