JP6290772B2 - Boom lifting device - Google Patents

Description

  The present invention relates to a lifting device for a boom that is provided in various heavy machinery.

  Conventionally, shipping equipment such as ship loaders and stackers used to ship bulk materials such as limestone and ore, iron ore carried into steelworks, coal carried into thermal power plants, ore loaded onto cargo ships, etc. A heavy machine such as a stacker or a reclaimer used for storing and carrying out loose materials generally has a boom that can be lifted.

  As a means for raising and lowering the boom, various cylinders are known, and a large driving force can be obtained with a relatively small device, start-up and braking can be performed without shock, and an excessive load is applied. Even in such cases, hydraulic cylinders were used because it was possible to avoid damage to machinery relatively easily by operating the safety valve, and in the case of two cylinders, pressure synchronization of both cylinders was easy. Compared to hydraulic cylinders, the hoisting means have lower energy efficiency, greater noise during driving, and management of hydraulic oil and disposal of waste oil. For example, Japanese Patent Application Laid-Open No. 2011-84357 and Japanese Patent Application Laid-Open No. 2012-46346 use electric motor-operated electric cylinders using ball screws. It is presented in.

  This boom raising / lowering device generally employs a system in which two electric cylinders are arranged in parallel, and two electric cylinders are mounted in parallel on the airframe, and the left and right electric motor shafts are tuned shafts such as universal joints. By connecting with each other, they are operated while being synchronized (synchronized) with each other.

  In this case, conventionally, the tip ends of the rods in the two electric cylinders are directly connected to the boom via a connecting pin, and two electric motors are applied when a lateral load is applied to the boom. The acting load on the cylinder is not uniform, and an indefinite load is generated, and there is a problem that the life of the electric cylinder is shortened.

  Further, in the above-described elevation device using an electric cylinder, in the case of an emergency in which one of the electric cylinders breaks down, one electric cylinder on the side that normally operates by releasing the synchronization of both electric cylinders is used. When the two electric cylinders are arranged in parallel as described above, the cylinder mounting portion for directly connecting to the boom has a large eccentric amount from the center of gravity of the boom frame. When the boom is lifted using only the electric cylinder, an excessive torsional load is applied to the boom frame side, so that there is a problem that the frame must be strengthened against the weight of the boom and the load during normal operation.

JP 2011-84357 A JP 2012-46346 A

  The present invention is intended to solve the above-described problems, and in a boom raising / lowering means using two electric cylinders, it is possible to realize a smooth raising / lowering operation of the boom, and further, two It is an object of the present invention to reduce the torsional load on the boom structure material when performing a lifting operation with one electric cylinder when one of the electric cylinders fails.

  Accordingly, the present invention connects a pair of electric cylinders, which are arranged in parallel in the width direction of the boom, between the body and a boom supported so as to be able to be raised and lowered, and drive the boom up and down. A boom raising and lowering device, wherein a tip of a rod in each electric cylinder installed in the airframe is connected to the boom via an equalizer plate.

In the present invention, the equalizer plate is formed with a connecting pin mounting hole for connecting to the boom at a central axis of the boom at a center position, and the width of the boom from the mounting hole in the equalizer plate. and wherein the mounting holes for electric cylinders for attaching the coupling pin electric cylinder for coupling the distal end of the rod in each of the electric cylinders in the lower end direction the position of and the boom in equally spaced positions in the direction are formed It is preferable to do.

Further, the pair of electric cylinders can be released from synchronization (synchronization), the pair of connecting pins of the equalizer plate can be removed, and the connecting pin for the electric cylinder for connecting the tip of the rod in each electric cylinder. of which overlap the electric cylinder mounting hole in the emergency mounting hole formed in the boom upward end direction the position of the boom mounting the emergency connecting pin auxiliary mounting holes are formed, when the one of the electric cylinder fails tuning of both the electric cylinder (sync) the emergency and failed side of the electric cylinder of the equalizer plate the auxiliary mounting hole remove the coupling of the normal electric cylinder side to the electric cylinder mounting hole with releasing the By connecting an emergency connecting pin to the mounting hole and connecting the equalizer plate and the boom, It can cope with the case where one of the electric cylinder fails by performing elevation of the boom.

  According to the present invention, in the boom raising and lowering means using two electric cylinders, it is possible to realize a smooth raising and lowering operation of the boom, and further, when one of the two electric cylinders breaks down. It is possible to reduce the torsional load on the boom structure material when the lifting operation is performed by one electric cylinder.

1 is a schematic diagram showing a preferred embodiment of the present invention. Explanatory drawing which shows the principal part in embodiment shown in FIG. Explanatory drawing which shows the principal part when one electric cylinder in the embodiment shown in FIG. 1 fails.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows a preferred embodiment of the present invention, which is provided with a boom 2 that performs a raising / lowering operation on an airframe 1 and two electric cylinders 3 and 4 arranged in parallel on the airframe 1. Has been.

  The electric cylinders 3 and 4 are arranged at predetermined intervals in the width direction near the center in the length direction of the body 2 of the airframe 1, for example, similar to those used in the conventional boom raising and lowering device. By rotating a ball screw (not shown) by driving 41, the rods 33 and 43 are moved forward and backward from the cylinder portions 32 and 42 to operate.

  Further, the ball screw portions driven by the electric motors 31 and 41 are connected by the synchronous shaft 5 so that both the electric cylinders 3 and 4 are synchronized (tuned) so that they can be released.

  Further, the rods 33 and 43 of the electric cylinders 3 and 4 are not directly connected to the boom 2 but are connected via the equalizer plate 6.

FIG. 2 shows the details of the connecting portion. The equalizer plate 6 is formed with a mounting hole 71 of the connecting pin 7 for connecting to a mounting hole 23 formed on the central axis of the boom 2 at the center position. together and the mounting hole 71 in the equalizer plate 6 for connecting the end of the rod 33, 43 at each electric cylinder 3 and 4 and the lower end direction the position of the boom 2 at equally spaced positions in the width direction of the boom 2 Electric cylinder mounting holes 81 and 91 for attaching the electric cylinder connecting pins 8 and 9 are formed, respectively.

  Furthermore, the pair of connecting pins 8 and 9 to which the rods 33 and 43 of the electric cylinders 3 and 4 of the equalizer plate 6 are attached are removable.

In addition, the equalizer plate 6, the upper end of the boom 2 from electric cylinder mounting holes 81, 91 of the electric cylinder connecting pin 8, 9 for connecting the end of the rod 33, 34 at each electric cylinder 3,4 Auxiliary attachment holes 82 and 92 for attaching emergency connection pins (not shown) are formed so as to overlap the emergency attachment holes 21 and 22 formed in the boom 2 at the directional positions .

  According to the present embodiment, the electric cylinders 3 and 4 are expanded and contracted to raise and lower the boom 2 in the same manner as in the conventional raising and lowering device. Since the rods 33 and 43 of 4 are not directly connected to the boom 2 but are connected to the equalizer plate 6 connected to the boom 2 by the connecting pin 7 via the connecting pins 8 and 9, the equalizer effect is produced. Since the load of the boom 2 on the electric cylinders 3 and 4 is evenly applied, the operation of the statically constant load during operation does not occur. Accordingly, both electric cylinders 3 and 4 are equally loaded, and an overload is applied to one electric cylinder 3 or 4 due to the load in the width direction of the boom 2 and the torsional load around the longitudinal axis of the boom 2. Can be prevented.

Further, when one of the electric cylinders 3 and 4, for example, the electric cylinder 4 fails, the synchronization (synchronization) of both the electric cylinders 3 and 4 is released and, as shown in FIG. The connection of the equalizer plate 6 to the electric cylinder mounting hole 91 is released, and the emergency connecting pin 84 is connected to the auxiliary mounting hole 82 on the normal electric cylinder 3 side and the emergency mounting hole 21 formed in the boom 2. Then, the equalizer plate 6 and the boom 2 are connected and the boom 2 is lifted and lowered by a normal electric cylinder 3.

  Thus, even when one electric cylinder 4 fails and only the other electric cylinder 3 needs to be operated, the equalizer plate 6 to which the electric cylinder 3 is connected by the connecting pin 8 is The emergency attachment hole 21 formed in the boom 2 on the 3 side and the auxiliary attachment hole 82 of the equalizer plate 6 are connected to the boom 2 by the emergency connection pin 84, so that the driving force of the electric cylinder 3 is directly applied to the boom 2. Therefore, the boom 2 can be lifted and lowered only by the other electric cylinder 3 by removing the failed electric cylinder 4.

  Although the case where the electric cylinder 4 has failed is shown here, even when the electric cylinder 3 fails, the boom 2 is lifted even when the other electric cylinder 4 must be operated in the same manner. Can be made.

  Furthermore, compared to the conventional structure in which the cylinders are attached to the lower part of the left and right main structural members of the boom 2, in this structure, the two electric cylinders are arranged close to the center of gravity of the boom without being restricted by the width of the structural member of the boom. It is possible to reduce the torsional load generated on the boom structural material due to the eccentricity from the center of gravity of the boom to the electric cylinder mounting portion during the boom lifting operation by one cylinder.

1 Airframe, 2 Boom, 3, 4 Electric cylinder, 5 Sync shaft, 6 Equalizer plate, 7 Connecting pin, 8 , 9 Electric cylinder connecting pin, 21 , 22 Emergency mounting hole, 23 Mounting hole, 31 Electric motor, 32 cylinder unit, 33 a rod, 41 an electric motor, 42 a cylinder portion, 43 a rod, 71 mounting hole, 81, 91 electric cylinder mounting holes, 82 and 92 the auxiliary mounting holes, 84 emergency coupling pin

Claims (1)

A boom is supported on the fuselage so that it can be raised and lowered, and a pair of electric cylinders that are arranged in parallel in the width direction of the boom in the fuselage and are releasably tuned (synchronized) with each other are arranged so as to intersect the central axis of the boom. a elevation apparatus of the boom which is connected to the boom and through the equalizer plate,
The equalizer plate has a connecting pin mounting hole for connecting to the boom at a central position, and is equidistant from the mounting hole in the width direction of the boom and at the lower end direction position of the boom. An electric cylinder mounting pin for connecting an end of the rod in the electric cylinder, and an electric cylinder mounting pin for connecting the tip of the rod in each electric cylinder. An auxiliary mounting hole for mounting an emergency connecting pin is formed at an upper end direction position of the boom from the mounting hole for mounting the emergency connecting pin, and both electric cylinders when the one electric cylinder fails The connection for the electric cylinder in the electric cylinder on the failed side is canceled Remove the connection of the equalizer plate to the mounting hole for the electric cylinder and connect the emergency connecting pin to the auxiliary mounting hole and the emergency mounting hole on the normal electric cylinder side to connect the equalizer plate and the boom. A boom raising and lowering device characterized in that the boom is raised and lowered by a normal electric cylinder .

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