Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
  • B66D3/00—Portable or mobile lifting or hauling appliances
  • B66D3/18—Power-operated hoists
  • B66D3/26—Other details, e.g. housings
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
  • B66D3/00—Portable or mobile lifting or hauling appliances
  • B66D3/18—Power-operated hoists
  • B66D3/24—Applications of limit switches

Definitions

• the invention relates to a conveyor, in particular a hoist, with a chain train passing through a chain wheel and driven by a motor, which is secured against jumping off the chain wheel by a chain guide and in which at least one switch or sensor is assigned to the chain guide a change in position of at least part of the chain guide switches off the drive motor of the conveyor.
• a chain conveyor of the above type with an essentially U-shaped chain guide which is pivotally mounted on bushings which enclose the drive shaft for the chain wheel of a chain strand consisting of round steel links.
• the sprocket is supported by roller bearings in the interior of the bushing already mentioned and has a bore through which the shaft of a drive motor projects, which is followed by a gear unit, the output-side pinion of which meshes with a toothed wheel that rotates is connected to the sprocket.
• the known chain conveyor changes the position or the shape of the chain strand, this leads to a pivoting movement of the chain guide and to the switching off of the drive motor for the chain wheel.
• the known construction may not be fully satisfactory insofar as its construction is complicated and expensive.
• the invention has for its object to provide a conveyor of the type under consideration, which combines the advantages of a perfect chain guide with the advantages of a simple structure.
• This object is achieved in that, in addition to a fixed guide section, the chain guide has a guide element which can be moved back and forth between two positions and serves to actuate the switch or sensor and is designed as a one-armed swivel lever, the swivel axis of which is turned away End is arranged in the region of the entry of the chain strand in the sprocket.
• the chain conveyor according to the invention has the advantage that the operating state of its chain strand is continuously monitored with very simple means, and that the user is therefore not required to check the readiness for discarding.
• the selected arrangement of the one-armed swivel lever ensures a high sensitivity of the shutdown mechanism for the drive motor of the conveyor.
• FIG. 1 shows a section through the essential parts of the chain guide of a conveyor equipped with a new chain strand and designed as a hoist
• FIG. 2 shows a section corresponding to FIG. 1 after reaching the condition of the chain strand that is ready for discarding
• FIG. 3 shows a section corresponding to FIG. 1 through a modified chain guide
• FIG. 4 shows a section corresponding to FIG. 2 through the modified chain guide according to FIG. 3 and
• FIG. 5 shows a section corresponding to FIG. 1 through a further chain guide.
• 1 is a sprocket formed as a pocket wheel with teeth 2 and pockets 3 arranged between two successive pairs of teeth 2.
• the sprocket is used to drive a chain strand 4 forming a lifting chain, the horizontal links 5 of which come to rest in the pockets 3 and its vertical members 6 engage in a gap arranged between the teeth 2 of a pair of teeth.
• the chain guide 7 has a guide element 9 which is formed by a lever pivotably mounted about an axis 8 and which is pressed by a spring 10 into a first position shown in FIG. This first position is defined by a stop 12 pressed against the left end face of a recess 11.
• a switch 14 having a feeler pin 13 and closes the supply circuit of a motor (not shown) serving to drive the chain wheel 1 at an interruption point, ie the hoist can be used.
• the division of the links 5 and 6 of the chain strand 4 increases, be it as a result of wear or overstretching, by an amount which makes it necessary to replace the chain strand 4, then it occurs in the area of the entry of the chain strand 4 into the chain wheel 1 for the so-called ascent of the horizontal links 5 onto the teeth 2 of the chain wheel 1, as indicated in FIG. 2 at point 15.
• the ascent of the horizontal link 5 at the point 15 has the result that the vertical link 6 following this horizontal link 5 is moved radially outward from the center of the chain wheel 1 and the guide element 9 of the chain guide 7 clockwise around the axis 8 pivots into a second position. This in turn leads to a displacement of the stylus 13 and opening of the switch 14 while overcoming the force of the spring 10, so that the motor for driving the chain wheel 1 is switched off and the worn chain strand 4 can be replaced.
• FIG. 5 An equally simple and therefore inexpensive solution is shown in FIG. 5.
• a guide element 19 is used to guide the chain strand 4, which is provided with a roller 18 which has a circumferential groove into which the the longitudinal member of the vertical members 6 facing the guide element 19 can be immersed.
• the chain condition is monitored in the area of the inlet of the section of the chain strand 4 connected to the load.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Control Of Conveyors (AREA)
• Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
• Intermediate Stations On Conveyors (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7756357

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (4)

Family Cites Families (5)

• 1995
  • 1995-02-28 DE DE19508727A patent/DE19508727C2/de not_active Expired - Fee Related
• 1996
  • 1996-02-23 AT AT96903921T patent/ATE174870T1/de not_active IP Right Cessation
  • 1996-02-23 DE DE59601048T patent/DE59601048D1/de not_active Expired - Fee Related
  • 1996-02-23 WO PCT/DE1996/000345 patent/WO1996026885A1/fr active IP Right Grant
  • 1996-02-23 EP EP96903921A patent/EP0812295B1/fr not_active Expired - Lifetime

Non-Patent Citations (1)

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