JP6290130B2 - lift device - Google Patents

Description

  The present invention relates to an elevating device for elevating and lowering an object. In particular, the screw shaft disposed in parallel with a support column is rotated by a motor or the like, and the object is moved up and down by using a forward and backward movement of a ball screw mechanism or the like. It is related with the raising / lowering apparatus which guides the raising / lowering with a guide member.

  Such an elevating device is mainly composed of a support unit such as a column, a motor, an elevating mechanism such as a ball screw mechanism, and a guide member for guiding elevating. Examples thereof are shown in Patent Documents 1 and 2. There is something.

JP 2009-91093 A JP 2013-127275 A

  In Patent Document 1, a ball screw mechanism is disposed inside a U-shaped column, a linear guide is provided on the inner surface of the column along the screw axis of the ball screw mechanism, and a gear connected to the screw shaft at the lower part of the column. An elevating device is disclosed that includes a box and a motor is coupled to the gear box.

  The lifting device of Patent Document 1 has a small installation floor area, and in this respect, it is compact. However, since the drive unit base on which the drive mechanism including the motor and the gear box is installed is disposed within the range of the column (directly below), the longitudinal direction (height direction) dimension of the lifting device is large. Tend to be.

  On the other hand, Patent Document 2 discloses an elevating device in which a screw shaft of a ball screw mechanism and a linear guide are arranged in parallel inside a support, and a motor for driving the screw shaft is also arranged in parallel. According to this configuration, the height direction dimension of the lifting device can be made smaller than that of the lifting device disclosed in Patent Document 1. In addition, since the longitudinal dimension of the linear guide is relatively long, the lifting / lowering member is guided to be lifted / lowered as compared with the lifting / lowering apparatus disclosed in Patent Document 1 in which the linear guide and the screw shaft have substantially the same longitudinal dimension. Wide range is possible.

  However, the lifting device of Patent Document 2 is for realizing a thin lifting device, and since the motor, the screw shaft, and the guide member are arranged in a line, the load due to the object is applied to the lifting device. There is also a problem that it tends to be biased. The lifting device is required to have not only the installation floor area and compactness in the height direction but also high rigidity. Therefore, a lifting device that achieves both of these requirements is desired.

  In addition, it is desirable that the lifting device has a smaller number of parts in terms of ease of assembly, improvement in maintenance, weight reduction, and reduction in manufacturing cost.

  Therefore, in view of the problems and needs of the conventional technology described above, the present invention provides an elevating device that achieves both installation floor area and compactness in the height direction, achieves high rigidity, and has a small number of components. For the purpose.

The present invention includes a pair of struts sandwiched between a base plate and a top plate;
A screw shaft that is orthogonal to a hypothetical line connecting the centers of both struts in a horizontal direction and is disposed at equal intervals with respect to the centers of both struts;
Attached to the lower surface of the front SL top plate, a gearbox output torque transmitted from a drive from the hollow output shaft, wherein the screw shaft is incorporated fit,
An elevating member that moves forward and backward on the screw shaft by rotation of the screw shaft;
A work mounting base that is connected to the elevating member by a connecting member that passes between the two columns, and that faces in the vertical direction opposite to the screw shaft with respect to the assumed line;
The above problem has been solved by a lifting device comprising a pair of guide members for guiding the lifting and lowering of the work mounting base on the surfaces of the both columns.

According to the present invention, a pair of struts being interposed between the base plate and the top plate is mounted on the lower surface of the gear box Gato Ppupureto, perpendicular to the horizontal direction to the assumed line connecting the centers of both struts, In addition, screw shafts are arranged at equally spaced positions with respect to the centers of both columns. In addition, the work mounting base connected by the connecting member passing between the two columns to the elevating member that moves forward and backward on the screw shaft faces the vertical direction opposite to the screw shaft with respect to the assumed line, and Since the structure is such that it is guided on the surfaces of both struts by a pair of guide members, the following effects are produced. That is, firstly, since the pillars are symmetrically arranged around the screw shaft and the guide members are provided on both pillars, the load due to the object can be equally received by both pillars. The rigidity of the lifting device can be increased. Thereby, since a guide member can be made comparatively small, the raising / lowering apparatus can also be made compact correspondingly. Second, since one end of the support can be brought close to the installation surface, the guide member can guide the lifting and lowering of the work mounting base from the upper part of the support to the lower part near the installation surface. Thereby, raising / lowering of a workpiece | work attachment base can be made smooth and stable. Moreover, the height direction dimension of the lifting device can be made relatively compact. Third, since it is possible to realize the arrangement of the columns and screw shafts that efficiently use the space, it is possible to minimize the installation floor area while increasing the rigidity. Therefore, it can be set as the raising / lowering apparatus which implement | achieved both high rigidity and compactness. In addition, since the gear box is attached to the lower surface of the top plate and the screw shaft is fitted into the hollow output shaft of the gear box, the end portion on the top plate side and the end on the base plate side of the screw shaft are inherently arranged. Of the bearings to be disposed in the portion, the bearing at the end portion on the top plate side can be omitted. As a result, the number of parts can be reduced by the amount of one bearing that supports the screw shaft, so that assembly is easy and maintenance can be improved. Further, the weight can be reduced and the manufacturing cost can be reduced.

In addition, if the screw shaft center is positioned between both struts, the distance between the screw shaft center and the load center can be reduced, and the allowable load on the screw shaft increases. It is possible to reduce the load on the machine.

  Further, if the support has a H-shaped cross section or a U-shape, a commercially available steel material having the same shape can be used as the support, so that productivity can be further enhanced.

The top view of the state which removed the top plate of the raising / lowering apparatus of 1st embodiment of this invention. The partial perspective view of the raising / lowering apparatus of 1st embodiment of this invention. The top view of the state which removed the top plate of the raising / lowering apparatus of 2nd embodiment of this invention. The side longitudinal cross-sectional view of the raising / lowering apparatus of 2nd embodiment of this invention. The side view of the raising / lowering apparatus of 2nd embodiment of this invention. The top view which shows the variation of the raising / lowering apparatus of 3rd embodiment of this invention (state which removed the top plate).

  An embodiment of the present invention will be described with reference to FIGS. However, the present invention is not limited to this embodiment.

  A lifting device 10 shown in FIG. 1 includes a pair of support columns 30 and 40 disposed between a base plate 12 and a top plate 16 (see FIG. 2), a screw shaft 22 and a lifting member that moves forward and backward on the screw shaft 22 ( It has a ball screw mechanism 20 including a lifting nut) 24. The screw shaft 22 is arranged at a position perpendicular to the assumed line X connecting the center P of the support column 30 and the center Q of the support column 40 in the horizontal direction and at equal intervals with respect to the centers P and Q of the support columns 30 and 40. It is installed. The workpiece mounting base 21 faces the vertical direction opposite to the screw shaft 22 with respect to an assumed line connecting the centers P and Q of the columns 30 and 40. The workpiece mounting base 21 and the elevating member 24 are They are connected by a connecting member 26 that passes between 40. A load receiving member (see reference numeral 25 in FIG. 3) on which an object is placed is attached to the work attachment base 21.

    As shown in FIG. 2, the support column 40 is sandwiched between the top plate 16 and the base plate 12, and the gear box G to which the motor M is connected is attached to the inner surface side of the top plate 16. Specifically, the gear box G is fixed by inserting bolts into the screw holes 62 provided in the gear box G from the upper surface side of the top plate 16. The screw shaft 22 is fitted into the hollow output shaft 64 of the gear box G, and is rotatably supported by a bearing 14 provided on the hollow output shaft 64 and the base plate 12. As a result, the bearings at the top plate 16 side end portion of the screw shaft 22 that are originally to be disposed at the top plate 16 side end portion and the base plate 12 side end portion can be omitted. The score can be reduced. Therefore, the lifting device 10 is easy to assemble and can improve maintenance. Further, the weight can be reduced and the manufacturing cost can be reduced.

  Since the gear box G is connected to the motor M as shown in FIG. 1, the torque of the motor M is output to the hollow output shaft 64 via the gear in the gear box G and transmitted to the screw shaft 22. . As a result, the screw shaft 22 rotates, and the elevating member 24 moves forward and backward on the screw shaft 22. In addition, what is necessary is just to apply the already known internal structure of the gear box G.

  As described above, the screw shaft 22 of the elevating device 10 is orthogonal to the assumed line X connecting the center P of the support column 30 and the center Q of the support column 40 in the horizontal direction, and is at the centers P and Q of the support columns 30 and 40. In contrast, they are arranged at equally spaced positions (see FIG. 1). Therefore, a configuration in which the support columns 30 and 40 are arranged symmetrically about the screw shaft 22 is realized. And since the guide member 50 which guides the workpiece | work attachment base 21 is provided in both the support | pillars 30 and 40 as mentioned above, the load by a target object can be received equally by both the support | pillars 30 and 40, and it goes up and down The rigidity of the device 10 can be increased. Thereby, since the guide member 50 can also be reduced in size compared with the past, the raising / lowering apparatus 10 can also be made compact accordingly. Moreover, according to arrangement | positioning of the support | pillars 30 and 40 and the screw shaft 22 like the raising / lowering apparatus 10, since space can be used efficiently, an installation floor area can be suppressed to the minimum.

Further, since the gear box G connected to the screw shaft 22 is installed outside the respective ranges of the support columns 30 and 40, the gear box as in Patent Document 1 is installed within the range of the support columns . Compared with a lifting device having the same longitudinal dimension of the screw shaft and the strut, the longitudinal dimension of the strut can be increased, and one end of the strut can be brought closer to the installation surface. In other words, when the dimensions are the same as the support column of the lifting device of Patent Document 1, the longitudinal dimension of the lifting device 10 can be made relatively compact (see FIG. 2). Thereby, the floor of the lifting device can also be lowered, and in this case, the operator can easily access the upper portion of the lifting device, so that maintenance can be improved.

  The guide member 50 that guides the lifting and lowering of the workpiece mounting base 21 is composed of a linear guide 52 and a pair of upper and lower slide members 54 that are guided by rolling rolling elements (not shown) on the linear guide 52. The slide member 54 is connected to the work mounting base 21 via the elevating bases 31 and 41. As shown in FIG. 2, the linear guide 52 is provided over substantially the entire longitudinal direction of the support column 40 (the same applies to the support column 30). To the lower part near the installation surface. Thus, the workpiece mounting base 21 can be raised and lowered smoothly and stably.

  As shown in FIG. 1, the support columns 30 and 40 of the lifting device 10 have a H-shaped cross section having flanges 32, 42, 36 and 46 and webs 34 and 44. The support columns 30 and 40 are arranged so that the work mounting base 21 is positioned outside the one flanges 32 and 42, but the orientation of the support columns 30 and 40 can be changed as appropriate. Further, the linear guide 52 of the lifting device 10 may be attached to any of the inner and outer surfaces of the flanges 32, 42, 36, 46 in addition to being attached to the webs 34, 44.

  Covers 28, 38, 48 surrounding the columns 30, 40 and the screw shaft 22 are attached to the columns 30, 40. Thereby, it is possible to prevent foreign matters such as dust from entering the ball screw mechanism 20 and the guide member 50.

  FIG. 3 is a plan view showing the lifting device 10a according to the second embodiment of the present invention. The basic configuration of the lifting device 10 a is the same as that of the lifting device 10. Like the elevating device 10a, struts 30a and 40a having a U-shaped cross section can also be used. The gear box G is installed outside the respective ranges of the support columns 30a and 40a, like the lifting device 10. The shapes of the connecting member 26a and the elevating base 31a are appropriately changed depending on the shapes of the columns 30a and 40a and the position of the guide member 50 attached to them. The guide member 50 includes a pair of upper and lower slide members 54, 54 as shown in FIG.

As shown in FIG. 3, the screw shaft 22 is orthogonal to the assumed line X ′ connecting the center P ′ of the support column 30a and the center Q ′ of the support column 40a in the horizontal direction, and the center P ′ of the support columns 30a and 40a. , Q ′ are arranged at equal intervals, and the center of the screw shaft 22 is located between the struts 30a, 40a. With this configuration, the distance between the load center L of the object to be mounted on the workpiece 25 mounted on the workpiece mounting base 21 and the screw shaft 22 can be reduced, and the allowable load of the screw shaft 22 increases. The load on 50 can be reduced. Therefore, the guide member 50 can be made more compact, and the entire lifting device can be made compact accordingly.

  FIG. 4 is a side longitudinal sectional view of the lifting device 10a. In the drawing, the guide member 50 is not shown for convenience. As shown in FIG. 4, the support column 30a is sandwiched between the top plate 16a and the base plate 12a, and the gear box G to which the motor M is connected is attached to the inner surface side of the top plate 16a. The screw shaft 22 is fitted into a hollow output shaft 64 of the gear box, and is rotatably supported by a bearing 14 provided on the hollow output shaft 64 and the base plate 12a. As a result, among the bearings that should originally be arranged at the top plate 16a side end and the base plate 12a side end of the screw shaft 22, the bearing at the top plate 16a side end can be omitted. The score can be reduced. Therefore, the elevating device 10a is easy to assemble and can improve maintenance. Further, the weight can be reduced and the manufacturing cost can be reduced.

  FIG. 6 is a plan view showing the lifting devices 10b to 10e according to the third embodiment of the present invention. The elevating devices 10b to 10e are in a state in which the top plate 16 (see FIG. 2) is removed in the same manner as the elevating device 10 shown in FIG.

  As in the columns 30b to e and 40b to e of the lifting devices 10b to 10e, the direction of the columns can be determined as appropriate. In addition, the position of the guide member 50 that guides the lifting and lowering of the work mounting base 21 with respect to the support can be determined as appropriate, and the shapes of the lifting bases 31 and 41 may be changed according to the position of the guide member 50.

  As in the lifting devices 10 to 10e described above, the productivity of the lifting device can be increased by using a commercially available shape steel having a cross-sectional H shape or a U shape as the support. Needless to say, struts having a shape other than the H-shaped cross section or the U-shape can be employed.

  The guide mechanism of the lifting device of the present invention may be one using a roller or a metal bearing in addition to the linear guide 52 and the slide member 54 described above. In addition to the ball screw mechanism, a lifting mechanism such as a trapezoidal screw mechanism can also be applied.

  As described above, according to the present invention, it is possible to provide an elevating device with a small number of parts that achieves both high rigidity and compactness.

M Drive device (motor)
G1, G2 Gearbox X Assumed line P, Q Center of pillar 10-10f Lifting device 12 Base plate 16 Top plate 21 Work mounting base 22 Screw shaft 24 Lifting member 26 Connecting member 30, 40 Column 50 Guide member 62, 64 Input / output shaft

Claims (4)

A pair of struts sandwiched between the base plate and the top plate;
A screw shaft that is orthogonal to a hypothetical line connecting the centers of both struts in a horizontal direction and is disposed at equal intervals with respect to the centers of both struts;
Attached to the lower surface of the front SL top plate, a gearbox output torque transmitted from a drive from the hollow output shaft, wherein the screw shaft is incorporated fit,
An elevating member that moves forward and backward on the screw shaft by rotation of the screw shaft;
A work mounting base that is connected to the elevating member by a connecting member that passes between the two columns, and that faces in the vertical direction opposite to the screw shaft with respect to the assumed line;
Characterized in that it comprises a pair of guide members for respectively guiding the lifting and lowering of the work mounting base on the surfaces of the two columns.
lift device. The lifting device according to claim 1, wherein the center of the screw shaft is located between the two columns.   The elevating device according to claim 1 or 2, wherein the both struts have a H-shaped cross section.   The elevating device according to claim 1 or 2, wherein the both struts have a U-shaped cross section.

Images