JPH0859195A - Lifter - Google Patents

Abstract

PURPOSE: To provide a lifter which is compact and which can ensure an elevating stroke without wasting time and labor. CONSTITUTION: A lifter is provided with a pillar 20 that is placed upright, an elevator 22 having a holding part 24, which is supported by the pillar 20 in a freely elevatable manner and which holds a vessel or the like, and a driving mechanism, which drives the elevator 22. As for the driving mechanism, a screw shaft 26, which extends from the middle part to the upper end part of the pillar 20 and whose both upper and lower ends are supported in a freely rotatable manner, a nut 27, which is threadably engaged with the screw shaft 26 in order to go up and down according to the rotation of the screw shaft 26 and which is provided with a wheel 30 for supporting a cable-like body, a motor 28, which is connected to the lower end of the screw shaft 26 in order to rotate the screw shaft 26, and a cable-like body, e.g. a chain 31, which is wound around the wheel 30 in such a manner that its both ends dangle from the wheel 30 but its one end is connected to the elevator 22 while the other end is fixed to the fixing member on the pillar (20) side, are provided. The elevator 22 is ascended or descended via the cable-like body, according to the ascendance or descendance of the nut 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating body having an upright support, an elevating body which is supported by the elevating column and which holds a container and the like, and a drive which drives the elevating body up and down. And a lifter provided with a mechanism.

[0002]

2. Description of the Related Art FIGS.
There is a prior art that employs various lifting drive mechanisms as shown in FIG.

(1) The lifter shown in FIG.
No. 143899, a ball screw type drive mechanism is adopted.

A rotary motor 2 arranged at the upper end of a column 1
A screw shaft 3 connected to a lower output shaft of the motor 2;
A ball nut 4 screwed onto the screw shaft 3 is provided, and an elevating body 5 is fixed to the ball nut 4. The upper and lower ends of the screw shaft 3 are rotatably supported on the supporting column side via a coupling 9 and a bracket, and the elevating body 5 includes a gripper 6 such as a fork for holding a container.

The lifter moves up and down the lifting body 5 integrally with the nut 4 by rotating the screw shaft 3 by the motor 2.

(2) The lifter shown in FIG. 7 employs, as a drive mechanism, a chain pulling method using a hydraulic cylinder 7 which expands and contracts upward.

A hydraulic cylinder 7 having a rod extending and retracting is provided on the column 1, and a chain wheel 8 is provided on the upper end of the rod of the hydraulic cylinder 7. A chain 10 is hung around both ends of the chain wheel 8. , One end of the chain 10 is connected to the lifting body 5, and the other end is fixed to a fixing member on the column side. As a drive source of the hydraulic cylinder 7, a hydraulic unit 11 including a hydraulic motor and the like is provided.

The extension of the hydraulic cylinder 7 causes the chain 10
The elevating body 5 rises via the. In this case, the chain 10
The speed and stroke of the lifting and lowering body 5 become twice as fast as the extension speed and stroke of the hydraulic cylinder 7 by the power transmission via the.

In the lifter shown in FIG. 7, a blind belt 12 is disposed on the front surface 1a of the column 1 as a member for covering a vertically elongated slit for projecting the gripping portion. The blind belt 12 is composed of a pair of upper and lower belt members, which are respectively connected to the upper and lower sides of the lifting body 5, and
It is wound around a mainspring-type winding device 13 at each of the upper and lower ends of the column.

(3) The lifter shown in FIG. 8 is the same as the lifter shown in FIG. 7, except that a motor cylinder 14 is provided instead of the hydraulic cylinder. Motor 15
Is converted into an expansion and contraction operation of the rod of the cylinder 14 by a ball screw method.

[0011]

[Problems to be Solved by the Invention]

(1) In the drive mechanism using only the ball screw system shown in FIG. 6, since the motor 2 is connected in series to the screw shaft 3, the space for arranging the motor and the space for coupling 9 are located above the screw shaft 3. Must be secured. Therefore, for example, in an environment where the ceiling height is limited, the lifting stroke S of the grip portion is significantly limited, and it may not be possible to secure a desired lift amount. That is, the applicable range becomes narrow.

(2) In the drive mechanism using only the chain pulling system shown in FIG. 7, the speed and stroke of the gripper 6 are twice the extension speed and stroke of the hydraulic cylinder 7, but the rod 7a of the hydraulic cylinder 7 Since only the lower end portion is in the upwardly projecting state supported, the load of the container and the elevating body 5 is applied to the rod tip in this state,
The buckling condition of the rod 7a becomes severe, and the rod 7a must have a thickness that can cope with a large buckling stress.
Therefore, the cylinder 7 and the hydraulic unit 11 are also required to have large capacities, and the entire lifter also becomes large.

Further, in the hydraulic cylinder 7, there is a possibility of oil leakage, and it goes without saying that the ascending drive function is deteriorated when this occurs, and in a chemical factory or the like, oil leakage adversely affects the contents of the container and the like. .

Further, in the structure using the lifting rod 7a, the height of the entire hydraulic cylinder 7 is required to be approximately twice as much as the lifting stroke of the rod 7a, and the hydraulic cylinder becomes large.

Also in the structure including the motor cylinder 14 of FIG. 8, as in the case of FIG. 7, the size is increased more than necessary in consideration of the buckling stress of the rod.

[0016]

An object of the present invention is to provide a lifter having a lifting drive mechanism, which can secure a sufficient lifting stroke of a gripping portion and at the same time can secure a space for disposing various devices and is less affected by buckling stress. is there.

[0017]

In order to solve the above-mentioned problems, the present invention relates to a column installed upright, and an elevating body having a grasping part which is supported by the column so as to be vertically movable and which grasps a container or the like. In a lifter having a drive mechanism for vertically moving the lifting body, as a drive mechanism, a screw shaft rotatably supported at both upper and lower ends from a middle portion to an upper end portion of a column, and a screw shaft screwed on the screw shaft. A nut having a wheel for supporting the cord-like body as well as moving up and down by the rotation of the screw shaft, a motor for connecting the lower end of the screw shaft to rotate the screw shaft, and hanging the wheel in a suspended manner at both ends. A lifter, one end of which is connected to an elevating body and the other end of which is fixed to a supporting member on a support side, and the elevating body is moved up and down through the elongate body by raising and lowering a nut. Is.

[0018]

[Operation] By rotating the screw shaft by the motor,
Raise the nut. A chain-like body such as a chain is pushed up by a wheel that rises with the nut, and the lifting body is raised.

[0019]

1 to 5 show a lifter to which the present invention is applied, which is used to discharge contents by lifting and inverting a chemical container C. FIG. First, referring to FIG. 1, the overall outline will be described. The column 20 is formed in the shape of a hollow prism, and is rotatably mounted on the floor F and the ceiling R via the upper and lower shafts 18 and 19 so as to be rotatable around the shaft. Both ends are supported. An elevating body 22 is supported by a pair of left and right guide rails 21 erected in the column 20 so as to be vertically movable via four guide wheels 29, and the elevating body 22 is attached to a front wall 20 a of the column 20. A fork-type gripper 24 for gripping a container C for medicine or the like is provided at the front end of the slit.

As a driving mechanism for driving the elevating body 22 up and down, a ball screw mechanism comprising a screw shaft 26, a ball nut 27 and a gear motor 28 with a brake, and a nut 27
A chain pulling mechanism including a chain wheel 30 rotatably provided on the wheel 30 and a chain 31 hung around the wheel 30 in a suspended manner at both ends is combined.

The detailed structure of the support structure of the support 20 and the support itself will be described. The bottom plate 33 and the top plate 35 of the column 20 are double layers. The lower support shaft 19 is fixed on a base 25 provided on the floor F and has an integral sun gear 38 at the upper end. The boss 33 a of the bottom plate 33 is rotatable on the support shaft 19. Fitted and supported. Upper support shaft 18
Is fixed to the top plate 35, is provided on the ceiling R, and is rotatably supported by the bracket 23 via a bearing.

A gear motor 40 for turning is fixed downward to the bottom plate 33 of the upper stage.
The gear 39 fixed to the output shaft of the gear engages with the gear 38 of the lower support shaft 19 and the rotation of the turning geared motor 40 causes the support 20 to rotate around the support shaft.

As shown in FIG. 2, the bottom plate 33 and the top plate 35 are integrally connected by angle members 36 arranged at four corners, and side wall plates 37 such as iron plates are provided between the angle members 36. The pillars 20 are stretched around each other, so that the pillar 20 is formed into a hollow prismatic shape. The front side wall plate 37 is formed with the slit d for projecting the grip portion described above.

The support structure of the elevating body 22 will be described. In FIG. 2, a pair of left and right guide rails 21 provided in a support column 20 are formed by fixing strip-shaped rail members on both front and rear sides of a base material having a U-shaped cross section, as shown in FIG. The upper and lower ends are fixed to the top plate 35 and the bottom plate 33, respectively.

In FIG. 3, the elevating body 22 is formed in a U-shape when viewed from above, and the guide wheels 29 are rotatably provided on inner surfaces of left and right side walls of the elevating body, respectively.
Each guide rail 21 is sandwiched between the front and rear guide wheels 29.

The lifting body 22 is provided with a pair of chain fixing portions 42 which are spaced from each other in the left-right direction. The fork type grip portion 24 is supported by a reversing motor 43 so as to be reversible.

The ball screw mechanism will be described. In FIG. 1, upper and lower intermediate support plates 45 and 46 are arranged at a position approximately half the height of the support column 20.
The bearing case 34 is fixed between the intermediate support plates 45 and 46, and the lower end of the screw shaft 26 is rotatably supported by the bearing case 34. The screw shaft 26 extends vertically upward, and the upper end is rotatably supported by the top plate 35 via a bearing. The geared motor 28 is fixed to the lower side of the lower intermediate support plate 46, is connected to the screw shaft 26 via a coupling or the like, and the screw shaft 26 is rotated by the rotation of the motor 28.

The ball nut 27 is screwed onto the screw shaft 26,
The pair of left and right chains 31 that engage with the pair of left and right chain wheels 30 prevent rotation, and the screw shaft 26 moves up and down when it rotates.

The intermediate support plates 45 and 46 are fixed to upper and lower T-shaped brackets 51 as shown in FIG. 2, the upper and lower T-shaped brackets 51 are connected by a stay 52, and the stay 52 is welded to the rail 21. ing.

The chain lifting mechanism will be described. 4, an upward U-shaped bracket 47 is provided on the upper surface of the ball nut 27, a horizontal support shaft 48 is fixed to the bracket 47, and the chain wheel 30 is rotatable on both left and right ends of the support shaft 48. It is supported. A return portion of an endless type blind belt 50 passes between the front ends of both wheels 30.

As described above, the chain 31 is hung around both chain wheels 30 in a manner that both ends are suspended, and the lower end of the rear portion of the chain 31 is fixed to the fixing portion 4 of the intermediate support plate 45 in FIG.
The lower end of the front part is fixed to the chain fixing part 42 of the elevating body 22 in FIG.

Endless blind belt 50
1 is wound around a pair of front and rear rollers 60 provided on the bottom plate 33 and the top plate 35 as shown in FIG. It is supposed to do.

The operation will be described. In the lowered position as shown in FIG. 1, the container C filled with the contents is gripped by the fork-type gripper 24.

The nut 27 is operated by operating the geared motor 28 for raising and lowering and rotating the screw shaft 26 in the forward direction.
To rise.

The raised portion of the chain 31 is pushed up via the chain wheel 30 by raising the nut 27,
Thereby, the lifting body 22 is raised.

Since the lifting drive motor 28 is arranged below the screw shaft 26 and the ball screw shaft method and the chain lifting method are combined, the lifting stroke of the lifting body 22 is approximately twice the stroke of the nut 27. The stroke can be secured and the column 20 can be raised to near the upper end portion.

When stopped at the predetermined raised position, the reversing motor 43 rotates to invert the container C as shown by the imaginary line, and then turns to the discharging position by the turning motor 40 to discharge the contents. After discharging, the swiveling operation is performed, the container C is returned to the normal posture by the rotation of the reversing motor 43 again, and this time, the screw shaft 26 is rotated in the reverse direction to lower the elevating body 22.

In this embodiment, since the left and right chain wheels 30 are arranged in a pair, the space between the wheels can be used as a passage space for the blind belt 50, and an endless type blind belt can be employed in a compact space. In addition, by adopting the endless method, compared with the conventional spring winding method, the problem that the movement of the lifting body and the blind belt is not synchronized due to spring fatigue and the belt wrinkles is eliminated, and the belt is always It is kept taut and can maintain good sealing performance.

Since the pair of left and right chain wheels 30 and 31 are used, they function to prevent the rotation of the nut 27, and a special rotation preventing member is not required.

[0040]

[Another embodiment]

(1) It is also possible to use a wire or belt instead of a chain as the cord, and wrap the wire or belt around a pulley.

(2) Instead of a ball nut, a normal nut can be used.

[0042]

As described above, according to the present invention,
It has the following effects. (1) As a lifting / lowering drive mechanism for the lifting / lowering body 22, a screw method using a screw shaft 26 and a nut 27 screwed to the screw shaft 26, and a lifting method using a wheel 30 and a cord-like body wound around the wheel shaft 26 are combined, and Since the lifting / lowering body 22 is lifted / lowered by providing the wheel 307 and lifting / lowering the nut 27, the lifting stroke can be ensured from the lower end to the upper end of the column 20 with almost no waste, and the environment with a low ceiling is low. However, it can be effectively raised to near the ceiling.

(2) Since the lifting body 22 is pulled up through the cord-like body by raising and lowering the nut 27 which is screwed into the screw shaft 26 whose upper and lower ends are supported, the cord-like body pulling method is used. Even though they are combined, there is no need to consider the buckling conditions of the rod, etc. as in the hydraulic cylinder system of FIG. 7, there is no need to increase the strength of the motor capacity and the thickness of the screw shaft excessively, and it is compact and A low-cost drive mechanism can be provided.

(3) As the raising and lowering drive mechanism, the screwing method using the screw shaft 26 and the nut 27 and the pulling up method using the wheel 30 and the cord-like body are combined, so that the lifting stroke of FIG. As described above, it is possible to secure a sufficient space for disposing another device, for example, the turning motor 40, in the lower portion of the column 20, and the entire lifter can be compact and compact.

(4) As compared with the conventional system using a hydraulic cylinder, it is possible to eliminate adverse effects on the contents due to oil leakage. Particularly, it is optimal when a chemical is stored in a container and is moved up and down.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a lifter to which the present invention is applied.

FIG. 2 is a sectional view taken along line II-II of FIG.

3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

5 is a side view showing only the drive mechanism shown in FIG. 1. FIG.

FIG. 6 is a side view of a conventional example.

FIG. 7 is a side view of a conventional example.

FIG. 8 is a side view of a conventional example.

[Explanation of symbols]

 Reference Signs List 20 support 22 elevating body 24 gripping part 26 screw shaft 27 nut 28 motor 30 chain wheel (an example of a wheel) 31 chain (an example of a cord-like body)

Claims (1)

[Claims] 1. A lifter comprising an upright column, an elevating body which is supported by the column so as to elevate and lower and has a grasping section for grasping a container and the like, and a drive mechanism for vertically moving the elevating body. In the drive mechanism, as a drive mechanism, a screw shaft whose upper and lower end portions are rotatably supported from an intermediate portion to an upper end portion of a column, and a screw shaft that is screwed to the screw shaft to move up and down and support the cord-shaped body With a wheel for rotation, a motor for rotating the screw shaft by connecting to the lower end of the screw shaft, and a wheel that is hung around both ends of the wheel so that one end is connected to the lifting body and the other end is fixed to the column side. A lifter comprising a cord-like body fixed to a member, wherein the lifting body is moved up and down through the cord-like body by raising and lowering a nut.