JP3785484B2 - lift device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an elevating device for use in raising bagged cereals and the like to a height at which they can be easily carried out.
[0002]
[Prior art]
As this type of lifting device, for example, those disclosed in JP-A-9-301695, JP-A-10-167700, or JP-A-2001-48102 are known.
[0003]
[Problems to be solved by the invention]
In the lifting device described in the above-mentioned Japanese Patent Application Laid-Open No. 9-301695 or Japanese Patent Application Laid-Open No. 10-167700, a loading sensor using a switch is provided to detect loading on the upper surface of the lifting table. Since the weight of bagged cereals to be loaded on the lifting platform is heavy, when loading on the lifting platform, it is often placed on the lifting platform so that the top surface of the lifting platform is dragged. Even when carrying out bagged cereals and the like, it is often an operation mode in which bagged cereals are dragged on the upper surface of the lifting platform. For this reason, in the conventional thing provided with the loading sensor of the lifting platform to operate on the upper surface of the lifting platform, the loading sensor was often damaged.
[0004]
Accordingly, an object of the present invention is to provide a structure in which the base end side of the lifting platform is pivotally supported in the vertical direction with respect to the movable body so that the lifting platform is elastically supported in a substantially horizontal shape. By providing a loading sensor that senses the downward rotation due to the loading load on the lifting platform between the base end side of the lifting platform, the upper surface of the lifting platform is completely smooth and heavy. It is another object of the present invention to provide an elevating device that can be easily loaded and unloaded and can reliably prevent a load sensor from being damaged.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a lifting apparatus according to claim 1 of the present invention includes a lifting platform supported by a vertical machine frame via a movable body, and lifts and lowers the movable body by winding and unwinding a suspension belt. The lifting device has a structure in which the base end side of the lifting platform is pivotally supported in the vertical direction with respect to the movable body, and the lifting platform is elastically supported substantially horizontally. Between the base end side, there is provided a loading sensor that senses downward rotation due to the loading load on the lifting platform.
[0006]
The suspension belt winding device for winding and unwinding the suspension belt is provided with a lower limit sensor for detecting the lower limit of the lifting platform, and between the movable body and the suspension belt, An adjustment mechanism for the lifting and unwinding lengths of the lifting and lowering belts by the lifting and lowering belt winding device is provided .
[0007]
The lifting device according to a second aspect of the present invention is the lifting device according to the first aspect, wherein the lifting platform is elastically supported in a slightly upward posture with respect to the possible body and holds the lifting platform in a horizontal posture during loading. that it comprises a and is characterized in.
[0008]
The lifting device according to claim 3 of the present invention is the lifting device according to claim 1 , wherein the adjustment mechanism for the lifting and unwinding length of the lifting belt by the lifting limit of the movable body and the lifting device of the lifting belt is as follows: The elastic support structure is interposed between the movable body and the suspension belt.
[0009]
A lifting device according to a fourth aspect of the present invention is the lifting device according to any one of the first to third aspects , wherein the lifting device has a function of automatically raising the lifting platform by a sensing operation of the loading sensor, and is provided in a winding device for the suspension belt. It has a control function that enables the loading sensor on the condition that the lower limit of the lifting platform is detected by the lower limit sensor, and disables the loading sensor in a range where the lower limit of the lifting platform is not detected by the lower limit sensor It is characterized by this.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The drawings show a lifting device according to an embodiment of the present invention. 1 is an overall front view and a partial plan view, FIG. 2 is an overall side view, FIG. 3 is a partially cutaway front view, FIG. 4 is a partially broken side view, FIG. Shows a related configuration of the movable body and the lifting platform, (a) is a cross-sectional view showing a mode not loaded on the lifting platform, (b) is a cross-sectional view showing the loading mode, FIG. 6 is a movable body and a suspension belt (A) is a broken side view and a broken front view showing an aspect of the movable body ascending, (b) is a broken side view and a front view showing the lowest lowered aspect of the movable body, FIG. It is the whole fracture | rupture side view which shows the operation | movement aspect of an raising / lowering apparatus, and the one part expanded sectional view, Comprising: (a) is in the state where the raising / lowering base lowered | lowered the most, (b) c) shows the state in which the lifting platform is raised most.
[0011]
Reference numeral 1 denotes a lifting device. The lifting device 1 includes a vertical machine frame 3 erected vertically on a base 2 and a lifting platform 4 that moves up and down on the front side. That is, the vertical machine frame 3 has a frame shape, and a movable body 5 is supported on the guide rail 7 by a plurality of rollers 6 so as to be movable up and down. Thus, the shaft is pivoted in the vertical direction. A suspension belt 9 is connected to the movable body 5 at the lower end.
[0012]
An upper part of the vertical machine frame 3 is provided with a winding device 10 for the suspension belt 9, and the upper end of the suspension belt 9 is connected to a winding pulley 11 of the winding device 10. When the belt 9 is wound on the winding pulley 11, the movable body 5 rises together with the lifting platform 4, and when the belt 9 is rewound, the movable body 5 moves down together with the lifting platform 4.
[0013]
The winding device 10 includes a motor 12 on the left side of the winding pulley 11 and a speed reducer 13 on the right side, and a transmission belt 14 is hung between the motor 12 and the speed reducer 13.
[0014]
The connection structure of the movable body 5 and the suspension belt 9 is as follows. That is, the movable member 16 is fitted to the receiving portion 15 that is integral with the movable body 5 so as to be movable up and down, and the movable member 16 is disposed between the receiving portion 15 and the movable member 16 in the vertical direction. A spring 17 is elastically supported on the frame. Reference numeral 18 denotes a support pin on the receiving portion 15 side, and 19 denotes an elongated hole on the movable member 16 side. Reference numerals 20 and 21 are upper and lower stoppers for restricting the vertical movement range of the movable member 16. The connecting structure of the movable body 5 and the suspension belt 9 is a movable body that serves as an adjustment mechanism for the lifting / lowering length of the suspension belt 9 by the winding device 10 of the suspension belt 9 and the winding device 10 of the suspension belt 9. 5 and an elastic support structure interposed between the suspension belt 9 and the suspension belt 9.
[0015]
The lifting platform 4 whose base end side is pivotally supported by the shaft 8 so as to be pivotable in the vertical direction with respect to the possible body 5 is elastically supported in a substantially horizontal shape, but the lifting platform 4 has a slightly upward posture. It is elastically supported by a spring 22, and 23 is a stopper for holding the lifting platform 4 in a horizontal posture when loaded. Reference numeral 24 denotes a load sensor. The load sensor 24 is composed of a limit switch 25 fixed to the movable body 5 side, and senses a downward rotation due to the load on the elevator 4. And the raising / lowering apparatus 1 is provided with the control apparatus (not shown) which has a function which the raising / lowering stand 4 raises automatically by the sensing operation of the loading sensor 24. FIG.
[0016]
According to the lifting device 1 according to the present invention, the loading sensor 24 for detecting loading on the lifting platform 4 is located between the movable body 5 and the lifting platform 4 with respect thereto, and the operation portion of the sensor exists on the upper surface of the lifting platform 4. Therefore, the upper surface of the lifting platform 4 can be a completely smooth surface. For this reason, even if it is heavy, it can be easily loaded / unloaded on the lifting platform 4 and the load sensor 24 can be reliably prevented from being damaged.
[0017]
The winding device 10 for the suspension belt 9 includes a lower limit sensor 26 that detects the lower limit of the lifting platform 4. This lower limit sensor 26 is interlocked with the winding pulley 11 of the winding device 10, and the operation disk 27 that rotates about 300 degrees by the rotation of the winding pulley 11 in the lifting range of the movable body 5, and this operation The limit switch 28 is provided corresponding to the disk 27, and the operating protrusion 29 of the operating disk 28 hits the limit switch 28 at the lowest position of the movable body 5 to close the switch. Then, the operating projection 29 is separated from the limit switch 28 so that the switch is opened.
[0018]
The control device enables the loading sensor 24 on the condition that the lower limit of the lifting platform 4 is detected by the operation of the limit switch 28 of the lower limit sensor 26 and the lower limit sensor 26 lowers the lifting platform 4. In the range where the limit is not detected, a control function for invalidating the loading sensor 24 is provided. Between the movable body 5 and the suspension belt 9, as described above, a lifting limit of the movable body 5 that is elastically supported by applying a spring 17 between the receiving member 15 and the movable member 16 on the movable body 5 side, and The adjustment mechanism for the winding and unwinding length of the suspension belt 9 by the winding device 10 of the suspension belt 9 adjusts the rotation of the winding pulley 11 and the lifting range of the movable body 5. There will be no deviation between the lower limit sensor 26 and the lower limit sensor 26.
[0019]
An upper limit sensor 30 is provided above the vertical machine casing 3. The upper limit sensor 30 is composed of an operating plate 32 that is pivotally supported by a shaft pin 31 at the upper end of the vertical machine casing 3 so as to be pivotable in the vertical direction and moves downward under its own weight, and a corresponding limit switch 33. The switch is turned on when the operation plate 32 is moved downward, but is turned off when the switch is moved upward. The operating plate 32 have through which the lifting belt 9, the upper limit sensor 30 is adapted to operate in operation actuation member 34 mounted on the lifting belt 9 pushes up the operating plate 33. Note that the operating position of the operating member 34 can be adjusted along the suspension belt 9, and the rising limit position of the lifting platform 4 can be changed by adjusting the operating member 34.
[0020]
By the way, in the range in which the loading sensor 24 is enabled on the condition that the lower limit of the lifting platform 4 is detected by the operation of the limit switch 28 of the lower limit sensor 26 and the lower limit of the lifting platform 4 is not detected by the lower limit sensor 26. By providing a control function for disabling the loading sensor 24, even if a load is applied on the lifting platform 4 by hand while the lifting platform 4 is positioned in the middle of the lifting range, the lifting / lowering platform 4 is lifted and lowered. The table 4 will not rise carelessly, and safety in handling will be ensured.
[0021]
The lower rear part of the vertical machine casing 3 is reinforced by a pair of left and right reinforcing plates 35. The reinforcing plate 35 has a substantially triangular shape and extends rearward of the vertical machine casing 3. The casters 36 and 36 of the elevating device 1 are attached to the lower end of the reinforcing plate 35. The casters 36 and 36 in the vertical machine frame 3 correspond to the base 2 extending forward. Therefore, this configuration greatly contributes to stabilization of the standing posture of the vertical machine casing 3.
[0022]
Further, the movable body 5 is provided with a cable winding device 37, and a cable 38 for connecting between the electrical mechanism on the movable body 5 side and the winding device 10 on the upper part of the vertical machine frame 3 and other electrical mechanisms is movable. As the body 5 moves up and down, it is neatly wound or unwound around the cable winding device 37 on the movable body 5 side so as not to loosen.
[0023]
【The invention's effect】
According to the lifting device of the present invention, the base end side of the lifting platform is pivotally supported in the vertical direction with respect to the movable body, and the lifting platform is elastically supported in a substantially horizontal shape. By providing a load sensor that senses the downward rotation due to the load on the elevator platform between the base end side of the elevator platform, the upper surface of the elevator platform is completely smooth and heavy. However, it is possible to easily load and unload the load sensor and to prevent the load sensor from being damaged.
[Brief description of the drawings]
FIG. 1 shows a lifting device according to an embodiment of the present invention, and is an overall front view and a partial plan view.
FIG. 2 is an overall side view showing a lifting apparatus according to an embodiment of the present invention.
FIG. 3 is a front view showing a lifting device according to an embodiment of the present invention, partially broken away.
FIG. 4 is a side view showing a lifting device according to an embodiment of the present invention, partially broken away.
5A and 5B show a related configuration of a movable body and a lifting platform, in which FIG. 5A is a cross-sectional view showing a related configuration of the movable body and the lifting platform not loaded on the lifting platform, and FIG. 5B is a sectional view showing a loading mode; FIG.
FIGS. 6A and 6B show a related configuration of the movable body and the suspension belt, wherein FIG. 6A is a broken side view and a broken front view showing a state in which the movable body is rising, and FIG. 6B is a bottom view of the movable body. It is the fracture | rupture side view and front view which show.
FIG. 7 is an overall cutaway side view showing an operation mode of the lifting device and an enlarged cross-sectional view of a part thereof, where (a) shows a state in which the lifting platform is lowered, and (b) shows that the lifting platform is rising. The state (c) shows the state in which the lifting platform is raised most.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lifting device 2 Base 3 Vertical machine frame 4 Lifting platform 5 Movable body 6 Roller 7 Guide rail 8 Shaft 9 Suspension belt 10 Winding device 11 Pulling pulley 12 Electric motor 13 Reduction gear 14 Transmission belt 15 Receiving part 16 Movable member 17 Spring 18 Support pin 19 Long holes 20, 21 Stopper 22 Spring 23 Stopper 24 Load sensor 25 Limit switch 26 Lower limit sensor 27 Actuation disk 28 Limit switch 29 Actuation protrusion 30 Shaft pin 31 Upper limit sensor 32 Actuation plate 33 Limit switch 34 Actuating member 35 Reinforcing member 36 Caster 37 Cable winding device 38 Cable

Claims (4)

In a lifting device provided with a lifting platform supported by a vertical machine frame via a movable body, and lifting and lowering the movable body by lifting and unwinding the suspension belt, a lifting belt for lifting and unwinding the suspension belt is provided. The winding device is provided with a lower limit sensor for detecting the lower limit of the lifting platform, and between the movable body and the suspension belt, the lifting limit of the movable body and the winding of the suspension belt by the winding device of the suspension belt, An adjustment mechanism for the unwinding length is provided, and the base end side of the lifting platform is pivotally supported in the vertical direction relative to the movable body, and the lifting platform is elastically supported in a substantially horizontal shape. And a loading sensor that senses downward rotation due to the loading load on the lifting platform between the movable body and the base end side of the lifting platform.   2. The lifting device according to claim 1, wherein the lifting platform is elastically supported in a slightly upward posture with respect to the possible body, and has a stopper structure for holding the lifting platform in a horizontal posture when loaded. The mechanism for adjusting the lifting / lowering length of the movable body and the lifting / rewinding length of the suspension belt by the suspension belt winding device has a configuration in which an elastic support structure is interposed between the movable body and the suspension belt. The lifting device according to claim 1 . It has a function of automatically raising and lowering the lifting platform by the sensing operation of the loading sensor, enabling the loading sensor on the condition that the lower limit of the lifting platform is detected by the lower limit sensor provided in the suspension belt winding device, and lifting device as claimed in any one of claims 1, characterized in that to the extent that descent limit of the lifting platform is not detected by the lower limit sensor that has a control function for disabling the loading sensor 3.

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