KR20120109904A - Lifter - Google Patents

Abstract

PURPOSE: A lifter is provided to enhance the space utilization of a car where the lifter is installed in a limited space because a driving part intensively installed can reduce an occupancy area of the lifter. CONSTITUTION: A lifter(100) comprises a base plate(1), a link part(2), elevating plates(3), and a driving part. The link part comprises multiple links(21,21a,21b) which are hinge-coupled each other to unfold. The links are radially coupled at the center of one side of the base plate. The elevating plates connect the links of the link part positioned at a same height. The driving part is mounted on the base plate and controls the extension of the link part. In the link part, the end of one of the links is hinge-coupled to the end of a neighbored link.

Description

Lifter {Lifter}

The present invention relates to a lifter for vertically moving an object to a high position, or moving a gondola or the like to a low position.

A lifter is a device for moving an object up and down, such as a high-altitude worker and an image photographing device. The lifter is used to raise an object from a ground level or to a tower crane for easy access to an exterior wall of a building.

Conventional lifter is a multi-stage rail, a type that has a power means such as a lifting and lifting platform along the rail that can be elevated along this rail and lifting the object and coupled with the object, and coupled in a zigzag manner There is a type that uses links. The former has the advantage of being easy to operate at a relatively low height, but due to the stability has a structural disadvantage that the platform must be operated in an inclined angle at a constant angle rather than vertically lifting.

In the type of using a link device coupled in a x-link (seesaw link) method, one x link device is conventionally used, which has a disadvantage in that one side extended by an external force such as wind is easily shaken. Therefore, there is a disadvantage that it is difficult to be used in places such as the exterior wall work of the building that must be able to stay in a predetermined position.

In order to compensate for this, as a related art, a lifter in which at least one pair of zigzag x link devices are installed perpendicular to each other has been developed. In this case, although a pair of x link devices reinforces shaking in a weak direction, structural stability is improved, but there is a disadvantage in that the load of the x link devices adversely affects the drive system. In addition, since the inertia increases as the weight increases, once shaking occurs due to an external force due to strong wind, etc., it also has a disadvantage in that it becomes very difficult to effectively reduce it.

The present invention has been made to solve the above-mentioned problems, and has the object of improving stability while reducing weight.

In accordance with an aspect of the present invention, the present invention provides a base plate, a plurality of links hinged to each other, and a plurality of links, which are radially coupled at the center of one surface of the base plate, positioned at the same height. Lifting plates for connecting the links of each link unit and a driving unit mounted to the base plate, the driving unit extending or contracting the link unit, the end of one of the links adjacent to each other in the link unit is hinged. Combined, the links present a lifter that forms a single bent line.

Here, a plurality of driving parts are slidably coupled to the base plate, and a slider having a hinge end coupled to a lower link of the lower link of the link part and a lower lifting plate connected to the lower links with respect to the base plate. It may include a lifting unit for lifting.

Further, the elevating unit includes at least one elevating unit, the elevating unit is a support erected between each of the link portion on one surface of the base plate, the auxiliary extending from the top of the support toward the center of the base plate Drive screw for rotating the ball screw and the screw shaft having a support shaft, the screw shaft coupled to both ends of the base plate and the support, a ball screw nut sliding in the longitudinal direction of the screw shaft and coupled to the lower lifting plate It may include a power transmission unit provided.

In this case, the intermediate elevating plates positioned on the upper elevating plate may be configured to be accommodated in a space between the elevating units.

In addition, the lifting unit is provided with a plurality of spaced apart at equal intervals in the center of the base plate, the power transmission unit is coupled to the drive shaft coupled to the output shaft of the drive motor coupled to the back of the base plate is rotated And a drive gear coupled to a power shaft penetrating the center of the base plate and a power shaft protruding from an upper surface of the base plate, and coupled to a driven gear coupled to a screw shaft of each lifting unit. .

Specifically, three link units may be installed along sides of a triangle having the center of the base plate as the center of gravity.

Alternatively, as another example, four link parts may be installed along a side of a square having the center of the base plate as the center of gravity.

According to the embodiment of the present invention, by providing a plurality of link portions formed in one line, while increasing the structural stability, it is possible to quickly stretch operation by reducing the total load of the lifter, and has the effect of reducing the shaking due to inertia. This structural stability and weight reduction has the effect of ensuring a long transport distance.

In addition, since the drive unit for driving the link unit is provided so as not to deviate from the radially arranged link unit, the intensively installed drive unit reduces the charge area of the lifter and improves space utilization in a vehicle or the like in which the lifter is to be installed in a limited space. Has

1 is a perspective view showing a lifter according to an embodiment of the present invention.
Figure 2 is an enlarged perspective view of the main part of the embodiment according to Figure 1;
3 is an exploded perspective view of the main part of the embodiment according to FIG. 1;
4 is a schematic side view of the embodiment according to FIG. 1;
5 is a perspective view showing an operating state of the embodiment according to FIG. 1.
6 a schematic plan view of the embodiment according to FIG. 5;
7 is a perspective view showing another operating state of the embodiment according to FIG. 1.
8 is a perspective view showing a lifter according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described the configuration, function and operation of the lifter according to the present invention.

In the following description, terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. Also, the singular forms “a”, “an” and “the” include plural forms unless the context clearly indicates otherwise.

The lifter according to the present invention includes a base plate, at least two link parts coupled to the base plate and responsible for stretching or stretching, and interconnecting each link included in each link part so that at least two link parts are coupled to each other. It includes a drive for causing the steel sheet and the link portion to stretch or stretch operation.

As shown in FIG. 1, one end of the linking portion 2 is connected to the base plate 1, and the other end of the linking portion 2 is hinged to some plate 5 as shown, Is hinged to. The plate 5 to which the other end of the link unit 2 is connected may be an object itself or a case capable of containing the height or a coupling member coupled thereto. In this case, the base plate is fixed in a vehicle, a ground structure, or the like, and the other end of the plate or the like can be raised and lowered by the operation of the link unit.

In another aspect, the object to which the other end of the linkage is hinged may be a protruding crane link of the tower crane. In this case, the base plate may be lowered or raised as a result of the lifting operation of the link unit, and the base plate may be combined with a gondola for aerial work.

In FIG. 1, the plurality of link parts 2 provided on the upper portion of the base plate 1 includes a plurality of links 21, 21a and 21b which are hinged and unfolded. In FIG. 1, the three link parts 2 form a substantially triangular shape and are elastically coupled in the vertical direction. The number of such link portions may be four, as shown in FIG. 8. At least two or more link portions may have an angle at which they are displaced, or may be stretched if the links of the same height are inclined in opposite directions to each other.

Considering the stability of the base plate, it is preferable that the plurality of link portions are radially coupled at the center of gravity of the base plate. If the center of gravity is changed on one surface of the base plate by the weight of the gondola or the like coupled to the base plate, it is preferable that a plurality of link portions are disposed radially based on the center of gravity. In the present invention, a description will be given of the center of gravity of one side of the base plate.

One of the main features of the present invention lies in the coupling method of the links constituting the link unit. As shown in FIG. 1, the neighboring links in each link unit 2 are hingedly coupled to the end of one of the links 21 and the end of the neighboring link 21. That is, the link portion of the present invention has the shape of the letter 'z', whereas the conventional technique uses the link device having the shape of the letter 'x'. Since the link portion of the present invention is hinged at both ends of other links with neighboring links, the entire links form a single bent line.

Such a link portion of the present invention has the advantage that the number of links used is reduced by half compared to the conventional 'x' shaped linkage. Therefore, compared to the linkage device according to the prior art having the same length, the link portion of the present invention is to reduce the weight to almost half. Even if a drive motor having the same output is used according to the weight of the light link portion, the maximum weight that can be lifted and raised is increased, and the small inertia has a strong characteristic against vibration. In addition, the omission of a link may bring about a reduction in manufacturing cost, thereby providing an economic advantage.

Referring to Figures 2 to 3, a specific configuration will be described.

The baseplate 1 is shown in a circular plate. The drive part 4 is attached to the upper surface of the base plate, and three link parts 2 are coupled to the periphery of the drive part 4.

Each link part 2 is provided along each side of the triangle which makes the center of the baseplate 1 the center of gravity. Here, each link part 2 is arrange | positioned at equal intervals radially equal distance from the center of the baseplate 1. Thus, if each link unit operates in the same manner, the lifting force acting on the base plate or the like acts perpendicularly to the center of gravity of the base plate and is not biased in any direction, thereby providing a condition for the base plate to be stably raised and lowered.

The driving unit 4 is slidably coupled to the base plate 1, and is connected to the slider 41 and the lowermost links where the end portions of the lowermost links 21a of the respective linking portions 2 are hinged. It includes a lifting unit 42 for elevating the lower lifting plate 31 with respect to the base plate (1).

First, a slider 41 is provided on the base plate, one for each link unit 2. The operation direction of the slider 41 is made along the side of a triangle like the arrangement direction of the link part 2. The slider 41 includes a shaft 411 and a housing 412 which is freely slidably coupled along the shaft 411 as in a known configuration. As a specific example, the slider may be an LM guide.

The lowermost link 21a is hinged to the housing 412. This hinge engagement direction is the same as the mutual hinge engagement direction of the links including the lowermost link.

The lower elevating plate 31 is hinged to the middle portion of the lowermost link 21a of each link portion, and the lower elevating plate 31 is horizontal with the base plate 1. The lower elevating plate 31 is hinged to the middle of each lower link 21a, so that when the height of the base plate changes due to the rotation of either lower link, the lower lower link 31 lowers the other lower link. do. That is, the lower elevating plate 31 is to force the lowest links 21a connected thereto to always be inclined at the same inclination.

Although not necessarily required, a hole 311 is formed in the center of the lower lifting plate 31. This hole provides a space in which the power shaft is accommodated when the lower lifting plate descends as will be described later.

On the other hand, the lifting unit 42 is a device for raising or lowering the lower lifting plate 31 relative to the base plate (1). The lifting unit 42 includes at least one lifting unit. The elevating unit is to elevate or lower the lower elevating plate 31, and the elevating unit may be provided in plural to make stable operation, or may be provided as a single unit to reduce the total load of the elevating unit. Hereinafter, it will be described that three lifting units 42a, 42b, 42c are provided.

The elevating units 42a, 42b, and 42c include a support 421, an auxiliary support 422, a ball screw 423 and a power transmission unit 424.

The support 421 is a member standing on one surface of the base plate 1. Specifically, each support 421 is erected between the link portions 2, so that looking at the plan view of Figure 6 each lifting unit (42a, 42b, 42c) is formed in a substantially triangular. The support 421 is firmly coupled to the base plate 1 by bolts, welding, or the like.

Auxiliary support 422 is coupled to the upper portion of the support 421, one end extends toward the center of the base plate (1). The support 421 and the auxiliary support 422 may be one member.

The ball screw 423 is a linear moving member of a known configuration in which the ball screw nut 423b is slid in the longitudinal direction of the screw shaft 423a by the rotation of the screw shaft 423a. The upper end of the screw shaft 423a is freely constrained to the auxiliary support 422, and the lower end of the screw shaft 423a is rotatably coupled to the base plate 1. In the drawing, a separate circular plate 11 to which the screw shaft 423a is coupled is shown at the center of the base plate 1, which can be omitted.

At this time, the ball screw nut (423b) is coupled to the lower lifting plate (31). As three lifting units 42a are provided in the drawing, the ball screw nuts of each lifting unit are coupled to the lower lifting plate at equal intervals. As a result, the lower elevating plate 31 moves up or down with respect to the base plate 1 according to the rotational direction of the screw shaft 423a, and operates the lowermost links 21a inclinedly.

On the other hand, the power transmission unit 424 includes a drive motor 424a, and transmits the rotational force of the drive motor 424a to the screw shaft 423a to rotate the screw shaft 423a in the forward or reverse direction.

Specifically, the power transmission unit 424 is connected to the drive motor 424a, which is coupled to the rear surface of the base plate 1, connected to the output shaft of the drive motor 424a, and rotates through the center of the base plate 1. A drive coupled to a power shaft 424b and a power shaft 424b protruding from an upper surface of the base plate 1, and coupled to a driven gear 424d coupled to a screw shaft 423a of each lifting unit. Gear 424c.

Since the driving motor 424a is provided on the rear surface of the base plate 1, when the link portions and the like folded on the upper surface of the base plate are stacked, they do not interfere with other components. The driving motor may be any motor widely used as a power source, such as a hydraulic motor or an electric motor, as long as the rotational direction can be controlled.

The power shaft 424b is installed to penetrate the center of the base plate 1, and the driving gear 424c is coupled to the power shaft 424b protruding from the base plate 1. Although not shown, the other end of the power shaft protruding to the rear surface of the base plate is connected to the output shaft of the driving motor through a gear box, etc., and is rotated in the forward or reverse direction according to the rotational direction of the driving motor. By installing a gear box using a worm gear, it is possible to change the rotation direction of the output shaft and increase the torque of the power shaft at the same time. Alternatively, the gearbox may be omitted, and the power shaft may be an output shaft of the drive motor.

Reference numeral 12 is a shaft fixing member which is coupled to one end of the power shaft, it can be omitted by other shaft fixing means.

The lower end of each screw shaft 423a is provided with a driven gear 424d that is bitten by the drive gear 424c. The pitch circle of each driven gear 424d is the same, and accordingly, each screw shaft is rotated at the same angular speed by the rotation of the power shaft 424b. Accordingly, the lower elevating plate 31 may be raised or lowered relative to the base plate 1 while maintaining the parallel with the base plate 1 as the drive motor 424a rotates.

The driving unit according to the embodiment of the present invention is installed intensively in the interior of the link portion. That is, the drive unit does not encroach on additional spaces other than the area corresponding to at least the base plate. Therefore, the lifter according to the embodiment of the present invention has the advantage that it can be installed with less spatial constraints on a mobile vehicle having a restricted installation space.

On the other hand, the power transmission means can be replaced with another configuration for rotating each screw shaft in the same direction. It is sufficient that such a power transmission means transmits the rotational force of the drive motor to each screw shaft exactly through a chain or the like. As another example, the drive motor rotates one of the screw shafts, and may be configured such that the other screw shaft is rotatable through the rotation movement transmission means such as a chain or a gear by the rotation of the screw shaft.

On the other hand, in addition to the above-described configuration, the elevating unit may be replaced with another configuration capable of elevating the lower elevating plate with respect to the base plate. As an example of the specific lifting portion, the cylinder is coupled to the base plate, and there is an actuator in which the piston is coupled to the lower lifting plate.

Referring back to FIGS. 1, 3 and 5 to 6, the lifting plates 3 are connecting members connecting the links 21, 21 a, 21 b located at the same height in each link unit 2 to each other. to be. The elevating plates 3 may be divided into a lower elevating plate 31 coupled to a lowermost link connected to the base plate 1 and an intermediate elevating plate 32 for other links except for the lowermost link. The configuration of the lower lifting plate is the same as described above.

On the other hand, the intermediate elevating plate 32 is a member for connecting the links 21, 21b located at the same height except for the lowermost link in each link portion 2.

The intermediate elevating plate 32 is hinged in the middle of the links 21 and 21b in the same direction in which the links 21 and 21b of each link portion are hinged to each other at their ends. With respect to the intermediate lifting plate 32, the links 21 and 21b are rotatable and constrain the links located at the same height so that the height change of one link is transmitted to the other link through the intermediate lifting plate, resulting in the intermediate lifting The links connected to the steel plates are forced to be the same height.

The intermediate elevating plate 32 has a substantially triangular shape, hingedly coupled with the links at the vertex portion, and a portion corresponding to the sides of the triangle forms a concave curved portion 321. This curved portion is for preventing the lifting unit from interfering when the link portion is stretched as described later.

Hereinafter, with reference to the accompanying drawings, it will be described the operation of the lifter according to an embodiment of the present invention.

1 and 2 is a state in which the lifter 100 is extended. When the power shaft is rotated by the rotation of the drive motor, each screw shaft connected to the power shaft is rotated at the same direction and angular speed, and the lower lifting plate 31 connected to the screw shafts is close to the base plate 1. Losing direction is moved.

In accordance with the lowering of the lower lifting plate 31 in FIG. 4, the lowermost link 21a having the middle portion hinged to the lower lifting plate 31 is closer to the base plate 1, and the lower end of the lowermost link 21a. Is moved on the upper surface of the base plate 1 by the slider 41. In addition, the inclination angle with respect to the base plate 1 gradually decreases as the lower link 21a descends the lower elevating plate 31. At this time, since the lower end of the lowermost link 21a is moved by the slider 41, the middle portion of the lowermost link 21a is moved in the vertical direction.

As the inclination angle of the lowermost link 21a with respect to the base plate 1 decreases with reference to FIG. 4, the lower end of the link 21b (hereinafter, referred to as 'first link') connected to the upper end of the lowermost link 21a is referred to. Move to the left side of the drawing. At this time, the middle portion of the first link (21b) is coupled by the intermediate elevating plate 32, the intermediate elevating plate 32 is coupled to other links of the same height as the first link, the position is changed on the horizontal plane It will not be lowered toward the base plate (1). In addition, the first link 21b also rotates so that the inclination angle with respect to the base plate 1 decreases with the lowering of the intermediate elevating plate 32.

The actuation of the tilt angle reduction and the lowering of the first link is carried out together at the other links connected around the intermediate lifting plate, and at both the other link and the intermediate lifting plate provided on the first link.

When the lower lifting plate is further lowered by the operation of the power transmission unit, the vertical length of the lifter 100 is reduced as shown in FIG. 5, and finally the lifter 100 is completely folded as shown in FIG. 7.

As shown in FIG. 5 and FIG. 7, when the lifter 100 is stretched, the intermediate elevating plate 32 is accommodated in the space between the elevating units 42a and 42b. As shown in FIG. 6, a space is formed between the lifting units 42a, 42b, 42c disposed radially from the center of the base plate 1, and the auxiliary support of the lifting unit 42a is provided in this space. The intermediate elevating plate 32 having the curved portion 321 recessed without interfering with 422 may be stacked.

On the other hand, the operation of extending the link portion to the lifter is made through the reverse rotation of the drive motor. The reverse rotation of the drive motor is to raise the lower lift plate with respect to the base plate in the power transmission section, and as the lower lift plate is raised, the lowermost links are established in the base play, and the other links are established with respect to the base plate. The lifter is extended.

FIG. 8 schematically illustrates a link unit configuration of a lifter according to another embodiment of the present invention. 8 shows the arrangement of the link portion and the intermediate elevating plate and the like, and omits some configurations of the elevating portion and the like, and shows that the shape of the intermediate elevating plate is greatly simplified.

The lifter according to another embodiment of the present invention includes a base plate, four link portions, lifting plates, and a driving portion. Each component is the same as the above-described embodiment except for the configuration of the link portion described below. The configuration of each link portion is the same as described above, so that the links included in one link portion are connected by a single line.

Each link portion 2 of the lifter according to another embodiment of the present invention is provided with four along the sides of the square centered on the center of the base plate (1). In the drawing, the dotted line displayed on the upper surface of the base plate 1 represents the coupling position of the slider to which the lowermost link of each link portion is coupled. As described above, the lower end of the lowermost link is moved in the longitudinal direction of the slider, and the link part is folded or unfolded.

At this time, the link portions 2 provided on the opposite sides of the square are in parallel with each other. However, the links of the link portions 2 parallel to each other are connected to the lifting plate so that their inclined directions are opposite to each other. That is, when one of the intermediate elevating plate 32 is viewed from one side, the link connected to the front side of the intermediate elevating plate 32 and the link unit connected to the rear side appear to intersect, and have the shape of the letter 'x'.

As such, by further providing two pairs of parallel link portions, this embodiment has the advantage of being more structurally stable against external forces.

The link portion of the present invention is that the rod-shaped links are hinged at both ends to form a single line, and has the advantage of reducing the load by half compared to the conventional linkage. Therefore, it is possible to provide a light and stable lifter.

100: lifter
1: Base plate
11: circular plate 12: shaft fixing member
2: link section
21: link 21a: bottom link 21b: first link
3: lifting plate
31: lower plate 311: hole 32: intermediate plate 321: curved portion
4:
41: slider 411: shaft 412: housing 42: lifting portion
42a: lifting unit 421: support 422: auxiliary support
423: Ball screw 423a: Screw shaft 423b: Ball screw nut
424: power transmission unit 424a: drive motor 424b: power shaft
424c: Drive Gear 424d: Drive Gear
5: plate

Claims (7)

Base Plate,
A plurality of links hinged to each other and having a plurality of links, the plurality of links being radially coupled at the center of one surface of the base plate;
Elevating plates connecting the links of each link portion located at the same height and
It is mounted to the base plate, and includes a drive unit for extending or stretching the link portion,
A lifter in each of said link portions hingedly coupled to an end of one of the links and an end of a neighboring link such that the links form a single bent line. In claim 1,
The driving unit
Sliders are slidably coupled to the base plate, and the slider is hinged to the end of the lowermost link of each link portion;
And a lifter configured to lift and lower a lower lift plate connected to the lowermost links with respect to the base plate. In claim 2,
The lifting unit includes at least one lifting unit,
The lifting unit is
Supports erected between each of the link portion on one surface of the base plate,
An auxiliary support extending from the top of the support toward the center of the base plate,
A ball screw having a screw shaft having both ends coupled to the base plate and the support, and a ball screw nut sliding in the longitudinal direction of the screw shaft and coupled to the lower lifting plate;
Lifter comprising a power transmission unit having a drive motor for rotating the screw shaft. 4. The method of claim 3,
Lifter intermediate lift plate is located in the upper portion of the lower lifting plate is accommodated in the space between the lifting unit. 4. The method of claim 3,
The lifting unit is provided with a plurality of spaced apart at equal intervals in the center of the base plate,
The power transmission unit
The driving motor coupled to the rear surface of the base plate,
A power shaft which is connected to the output shaft of the driving motor and rotates and penetrates the center of the base plate;
And a drive gear coupled to a power shaft protruding from an upper surface of the base plate and coupled to a driven gear coupled to a screw shaft of each lifting unit. 5. The method of claim 4,
The link unit
Lifter is provided with three along the sides of the triangle centered on the center of the base plate. 5. The method of claim 4,
The link unit
Lifter is provided with four along the sides of the square centered on the center of the base plate.

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