Electric lifting device

Abstract

To provide an electric lifting device not to cause the restrictions of an installation space.SOLUTION: An electric lifting device comprises an electric motor EM, a rotary arm 2 to rotate around an axis of the electric motor, a lifting / lowering member 3 supported by a guide rod 8 and lifting / lowering, a swinging member 4 interposed between the rotary arm and the lifting / lowering member, in which the point of force, a fulcrum, and the point of application are set, a first link member 5 connected rotatably to the rotary arm at a first connection part in the rotary arm side and connected rotatably to the swinging member at the point of force, and a second link member 6 extending in the vertical direction between the swinging member and the lifting / lowering member, and connected rotatably to each of the swinging member and the lifting / lowering member. The center of a rotational driving axis RDS, the center of the first connection part, and the point of force PP are aligned on a straight line when the lifting / lowering member 3 is at the rising end position and at the lowering end position. The swinging member 4 is located at the position where the fulcrum FP and the point of force are off the bottom of the lifting / lowering member 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a lifting device using an electric motor for moving an object in the vertical direction. [Background technology]

[0002] As an electric lifting device using an electric motor, the inventors have developed one that uses a crank mechanism to move a lifting member up and down at a fixed stroke (see, for example, Patent Document 1 below). Such lifting devices generally rotate a rotary arm that rotates around the axis of the rotary drive shaft of an electric motor in one direction and stops at the upper end (top dead center) and the lower end (bottom dead center).

[0003] The lifting device of Patent Document 1 is excellent in that when the lifting member is at the raised end, the rotating arm stands vertically with the center of rotation downwards, and even when the weight of the lifting member is added at the top dead center position, no rotational force acts on the rotating arm, and no large load is applied to the brake device attached to the drive motor, making it possible to accurately position the height. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Application No. 2022-099284 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the lifting device of Patent Document 1, the main mechanism is located directly below the lifting frame, and therefore the installation space is limited by guide rods and the like located around the mechanism. In particular, when a long lifting stroke is required, the radius of the rotary arm becomes large, making it difficult to arrange the mechanism.

[0006] An object of the present invention is to provide an electric lifting device that does not impose restrictions on installation space even when a long lifting stroke is required. [Means for solving the problem]

[0007] According to a first aspect of the electric lifting device of the present invention, the device comprises an electric motor, a rotating arm that rotates around the axis of the rotary drive shaft of the electric motor, a lifting member that is supported by a guide rod extending in the vertical direction and that lifts and lowers an object to be transported, and a oscillating member that is interposed between the rotating arm and the lifting member and has a force point to which a force is applied from the rotating arm side, a fulcrum that is supported by a base frame, and a point of action that rotates around the fulcrum due to the force applied to the force point and transmits the force from the force point side to the lifting member side.

[0008] The device further comprises a first link member interposed between the rotating arm and the oscillating member, rotatably connected to the rotating arm at a first connecting portion on the rotating arm side, and rotatably connected to the oscillating member at the force point, and a second link member extending in the vertical direction between the oscillating member and the lifting member, and rotatably connected to the oscillating member and the lifting member, respectively.

[0009] The oscillating member is configured so that at least the force point is located at a position that is away from directly below the lifting member, and when the lifting member is at the upper end position or the lower end position, the center of the rotation drive shaft, the center of the first connecting part, and the force point are aligned in a straight line.

[0010] According to this, the drive mechanism that applies force to the fulcrum supported by the structure or the force point that is a large-scale structure is located away from directly below the lifting member, so there are no restrictions on the installation space. Furthermore, when the lifting member is at the upper and lower ends, the center of the rotary drive shaft, the center of the first connecting part, and the force point are aligned in a straight line, so that the rotational force due to the weight of the lifting member does not act on the rotary arm. This prevents a large load from being applied to the brake device attached to the drive motor, making it easy to maintain the correct height position.

[0011] According to the electric lifting device of the second aspect of the present invention, in the electric lifting device of the first aspect, the distance from the point of application to the fulcrum is longer than the distance from the point of effort to the fulcrum.

[0012] According to this, because the force is transmitted to the point of application by the rotation of the swinging member, if a longer lifting stroke is required, this can be easily adjusted by making the distance between the fulcrum and the point of application longer than the distance between the force point and the fulcrum. Furthermore, by increasing the radius of rotation formed by the point of application and the fulcrum, the arc portion of the path approaches a straight line, thereby reducing the lateral load generated during lifting. This reduces wear on the guide rod and prevents the lifting member from being unable to maintain its horizontal position.

[0013] According to the third aspect of the electric lifting device of the present invention, in the electric lifting device of the first aspect, there is further provided a holding member which has an insertion hole through which the guide rod is inserted, penetrates and is fixed to the base frame, has an inner surface facing the outer surface of the guide rod so as to resist a load that tilts the guide rod relative to the vertical direction, and protrudes a predetermined length above the base frame.

[0014] This reduces the lateral load acting on the guide rod during lifting and at the extended position at the lift end, and also reduces the bending moment acting on the guide rod, which reduces the strength of the guide rod, reduces wear on the sliding parts, and also cuts costs.

[0015] According to the fourth aspect of the electric lifting device of the present invention, in the electric lifting device of the first aspect, at the lower end position of the lifting member, a plurality of abutment members are provided between the lifting member and the base frame, the abutment members being adjusted in height so as to abut on an imaginary horizontal plane, thereby suppressing tilting of the lifting member.

[0016] According to this, the lifting member abuts parallel to the base frame by the multiple abutment members. Therefore, the lifting member is maintained horizontally without tilting at the lowermost position, preventing the occurrence of a step between the lifting member and an adjacent location. This allows safe and reliable loading and unloading of transported goods between the lifting member and an adjacent transport location at the lowermost position.

[0017] According to the fifth aspect of the electric lifting device of the present invention, in the electric lifting device of the first aspect, there are multiple guide rods, and between an upper surface portion having an upper surface provided at the lower part of the guide rod and a lower surface provided on the base frame, there are multiple stopper members that evenly contact the upper surface or the lower surface, and the stopper members suppress the inclination of the lifting member at the raised end position of the lifting member.

[0018] According to this, the lifting member contacts the base frame in parallel by the multiple stopper members. Therefore, the lifting member is maintained in a horizontal state without tilting at the uppermost position, and it is possible to prevent the occurrence of a step between the lifting member and the adjacent transport location. This allows the loading and unloading of transported goods onto the lifting member safely and reliably at the uppermost position.

[0019] According to the sixth aspect of the electric lifting device of the present invention, in the electric lifting device of the first aspect, in the swinging member, the rotation shaft constituting the fulcrum extends a predetermined distance in a direction along the axis of the rotation shaft, and a portion to which the force point belongs and a portion to which the action point belongs are spaced apart from each other along the direction in which the rotation shaft extends, The force point and the action point rotate about the rotation axis in different vertical planes.

[0020] This allows the part to which the force point or action point of the swinging member belongs to to be changed in accordance with the layout in which the device is set, thereby making it possible to avoid interference with devices necessary for other configurations. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a vertical cross-sectional view of an electric lifting device according to a first embodiment of the present invention, as viewed from the side; [Figure 2] FIG. 2 is a cross-sectional view taken along the line II-II in FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. [Figure 5] FIG. 2 is a cross-sectional view taken along the arrows VV in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. [Figure 7] 10A and 10B are diagrams showing a process in which the rotary arm is rotated to raise the lifting member. [Figure 8] 10A and 10B are diagrams showing a process in which the lifting member is raised to the uppermost position. [Figure 9] FIG. 6 is a cross-sectional view of an electric lifting device according to a second embodiment of the present invention, as viewed from above. [Figure 10] 10A and 10B are diagrams illustrating another example of an electric lifting device according to the second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] (First embodiment) A first embodiment of an electric lifting device according to the present invention will be described below with reference to Figures 1 to 8. Hereinafter, the embodiment of the present invention will be described with reference to the drawings.

[0023] 1, the horizontal direction extending from side to side is called the X-axis direction, and the horizontal direction perpendicular to the X-axis direction is called the Y-axis direction. Also, if we consider a virtual center line of a tangible object, the side closer to the center line is called the inside, and the side farther from the center line is called the outside.

[0024] The electric lifting device 1 according to the first embodiment of the present invention includes an electric motor EM, a rotating arm 2, a lifting member 3, a swinging member 4, a first link member 5, and a second link member 6. These devices and members are mounted on a base frame BF, which is a structural body.

[0025] In the electric lifting device 1, the lifting member 3 carrying the transported object W moves up and down between a predetermined lower end position LEP and an upper end position REP (see FIG. 8) based on the drive of the electric motor EM. The electric lifting device 1 is connected to an upper conveying path UCP, which conveys the mold M, which is the transported object W, and a lower conveying path LCP, at the upper end position REP (see FIG. 8) and the lower end position LEP.

[0026] (electric motor) In this embodiment, an electric motor EM equipped with a brake is used as the electric motor EM. The brake torque here is preferably about 1.5 times larger than the driving rotation torque generated by the electric motor EM during lifting and lowering operations.

[0027] The electric motor EM rotates the rotary drive shaft RDS 180 degrees clockwise when raising the lifting member 3 from the lowering end position LEP shown in Fig. 1. Also, when lowering the lifting member 3 from the upper end position REP shown in Fig. 8, the electric motor EM rotates the rotary drive shaft RDS 180 degrees counterclockwise.

[0028] Therefore, the operation of the electric motor EM is controlled based on the rotation angle of the rotary drive shaft RDS. The rotation angle can be detected, for example, by providing a rotation angle detector on the rotary drive shaft RDS. It is also possible to provide a protrusion (detector) at the tip of the rotary arm 2 and detect this with a proximity switch, limit switch, etc.

[0029] (Rotating arm) The rotary arm 2 is coupled to a rotary drive shaft RDS, which is the output shaft of the electric motor EM, and transmits a driving force to the first link member 5 by rotating integrally with the rotary drive shaft RDS around the axis of the rotary drive shaft RDS.

[0030] The rotating arm 2 is made of, for example, two oval steel plates integrally formed with a gap in the thickness direction. As shown in Figure 6, the rotating arm 2 is integrally joined to the rotary drive shaft RDS near one longitudinal end, and is connected to the first link member 5 near the other longitudinal end.

[0031] (First link member) When the arcuate orbit of the radius of rotation described by the rotating arm 2 differs from the arcuate orbit of the radius of rotation described by the force point PP of the oscillating member 4, the first link member 5 adjusts the interlocking of the different arcuate orbits to transmit the driving force from the rotating arm 2 to the oscillating member 4.

[0032] The first link member 5 is formed, for example, from a single boomerang-shaped iron plate, and one end of the first link member 5 is connected by a connecting pin CP between the two rotating arms 2 so as to be relatively rotatable. The portion where the rotating arms 2 and the first link member 5 are joined by this connecting pin CP corresponds to a first connecting part FCP.

[0033] The portion of the first link member 5 that rotates and becomes the inside of the winding operation is formed with a pocket 5a into which the outer periphery of the rotary drive shaft RDS fits. The other end of the first link member 5 is connected to the swing member 4 by a connecting pin CP so as to be rotatable relative to the swing member 4. The joint between the other end of the first link member 5 and the swing member 4 by this connecting pin CP corresponds to a force point PP, which will be described later.

[0034] (swinging member) The swinging member 4 is provided with a force point PP, a fulcrum FP, and a point of application AP, and the force from the first link member 5 applied to the force point PP causes the point of application AP to rotate around the fulcrum FP.

[0035] The swinging member 4 is made up of two boomerang-shaped plates that are longer than the first link member 5 and are spaced apart by a predetermined width and joined together at two joints 4a. The swinging member 4 is bent at an obtuse angle at the fulcrum FP.

[0036] In this embodiment, the rocking member 4 is set such that the second link member 6 side, where the point of application AP is located, is located at a longer distance from the fulcrum FP than the first link member 5 side, where the point of application PP is located. By lengthening the stroke of movement of the point of application AP and making the path of the point of application AP an arc with a large radius of rotation, the path approaches a straight line, thereby reducing the lateral load generated by the second link member 6.

[0037] At the fulcrum FP, a rotation shaft 4s extending in the Y-axis direction is formed integrally with the swinging member 4, and the rotation shaft 4s is journaled on a bearing pedestal 7 (described later) fixed to the upper surface of the base frame BF. The vicinity of the tip of the swing member 4 on the side of the application point AP is bent upward.

[0038] As shown in FIG. 5, a pair of bearing pedestals 7 are arranged side by side in the Y-axis direction on the upper surface of the base frame BF, and a bearing hole 7h is provided at the top so that the rotary shaft 4s can rotate relatively rotatably. The swing member 4 is connected to a second link member 6 by a connecting pin CP at a point of application AP.

[0039] (Second link member) The second link member 6 connects the oscillating member 4, which rotates, and the lifting member 3, which moves linearly up and down. The second link member 6 is made of, for example, iron, and is formed from a single rectangular plate with circular ends. The lower end is connected by a connecting pin CP at the point of application AP of the oscillating member 4 so as to be relatively rotatable. The upper end is connected by the connecting pin CP to a horizontal beam 3b (see Figure 3) of the lifting member 3, which will be described later, so as to be relatively rotatable. The connection portion between the second link member 6 and the horizontal beam 3b of the lifting member 3 by this connecting pin CP corresponds to the second connecting portion SCP. A rectangular through-hole TH is provided in the base frame BF to prevent the second link member 6 and the oscillating member 4 from contacting the base frame BF when the second link member 6 descends.

[0040] (Lifting member) The lifting member 3 carries an article W and moves up and down between a lowering end position LEP and an upper end position REP. The lifting member 3 includes a lifting member body 3a, a rail 3r, and a crosspiece 3b.

[0041] The lifting member main body 3a is made of, for example, iron and is formed into a rectangular frame shape by an X-axis member 3x that extends along the X-axis direction and a Y-axis member 3y that extends along the Y-axis direction, each of which is a columnar member with a square cross section (see FIG. 3). The X-axis member 3x and the Y-axis member 3y are provided in pairs parallel to each other, and the tip of a guide rod 8, which will be described later, is attached to the underside of the intersection between the X-axis member 3x and the Y-axis member 3y. Both ends of the X-axis member 3x protrude a predetermined distance to form protrusions 3P, and the underside of the protrusions 3P abuts against a contact member CM, which will be described later (see FIG. 1).

[0042] A pair of horizontal bars 3b extending along the X-axis direction are laid across the center of the opposing Y-axis members 3y, and as mentioned above, the upper end of the second link member 6 is connected to the horizontal bars 3b by a connecting pin CP. The lifting member body 3a is provided with two rails 3r extending along the X-axis direction.

[0043] The two rails 3r are assembled so as to span between the Y-axis members 3y aligned in the X-axis direction. The two rails 3r are aligned with an upper transport rail UTR (described later) at the upper end position REP of the lifting member 3, and are aligned with a lower transport rail LTR (described later) at the lower end position LEP of the lifting member 3.

[0044] (guide rod) The guide rods 8 guide the vertical movement of the lifting member 3. The guide rods 8 are made of, for example, iron, and are formed of four solid rod members. The guide rods 8 are inserted vertically through holding members 9 (described later) that are fixed to the base frame BF through which they pass.

[0045] As described above, the upper end of each guide rod 8 is attached to the underside of the intersection of the lifting members 3. The lower ends of the guide rods 8 are connected by connecting members 8a that span between adjacent lower ends in the X-axis direction and the Y-axis direction. The connecting members 8a are formed in a generally rectangular shape, and are attached by bolts B to female threads that are threaded into the lower ends of the guide rods 8.

[0046] The connecting member 8a has upper surface portions 8b that protrude horizontally from both ends that are continuous with the sides in the X-axis direction. Each upper surface portion 8b has an upper surface that faces the lower surface of the base frame BF, and a stopper member 8c is provided on each upper surface to protrude vertically. The stopper members 8c are, for example, bolts, which are screwed into the female threads of the upper surface portion 8b and fixed in place. The heads of the stopper members 8c are adjusted so that they are all at the same height.

[0047] (Holding member) The holding member 9 is made of, for example, iron and formed in a cylindrical shape. The holding member 9 is fixed in a state in which it penetrates a mounting hole provided through the base frame BF. The cylindrical portion and the inner peripheral surface 9a of the insertion hole of the holding member 9 are formed by, for example, hardening, etc., to improve rigidity so as to resist a load that tilts the guide rod 8 from the vertical direction.

[0048] The holding member 9 is formed with a long dimension so that it protrudes above the upper surface of the base frame BF, thereby suppressing stress concentration on the guide rod 8. A flange 9b is provided around the outer periphery of the upper cylindrical portion, which abuts against the peripheral edge of a mounting hole provided in the base frame BF, so that the holding member 9 can withstand external forces from above.

[0049] Abutment members CM protrude upward from the top surface of the base frame BF, outside the holding member 9 in the X-axis direction. The abutment members CM are, for example, bolts that are screwed into and fixed to the top surface of the base frame BF. When the lifting member 3 is at the lowermost position LEP, the lower surface of the lifting member 3 abuts against the head of the abutment member CM, preventing the lifting member 3 from tilting obliquely.

[0050] (Transport path) The conveying path in the first embodiment conveys, as an article W to be conveyed, for example, a poured mold M mounted on a carriage C. The transport path includes an upper transport path UCP and a lower transport path LCP, each of which includes a pair of transport rails UTR, LTR extending along the X-axis direction.

[0051] As shown in Fig. 4, pairs of support columns SP are erected on the upper surface of both ends of the base frame BF in the Y-axis direction. Pairs of support members SM are horizontally suspended from the upper ends of the support columns SP so as to extend along the conveyance direction. An upper horizontal member UHM is suspended between the opposing support members SM, and a lower horizontal member LHM is suspended between the support columns SP. The upper horizontal member UHM supports the conveyance rails UTR of the upper conveyance path UCP, and the lower horizontal member LHM supports the conveyance rails LTR of the lower conveyance path LCP. (Control device) A control device (not shown) controls the rotation of the electric motor EM and the operation of the pusher device and cushion device (not shown).

[0052] (Activation) Next, the operation of the electric lifting device according to the first embodiment will be described below with reference to FIGS. As shown in Figure 1, the rotating arm 2 is positioned at a position 45 degrees clockwise from the horizontal position. At this time, the center of the rotary drive shaft RDS, the center of the first connecting part FCP, and the force point PP are aligned on a straight line tilted at 45 degrees, rather than on a vertical line as in the conventional case. Even in this case, the force applied to the rotating arm 2 from the swinging member 4 does not generate a rotational force, so the lifting member 3 is held in a stable position. This position is the end of the counterclockwise rotation.

[0053] The swinging member 4 is rotated counterclockwise by the first link member 5, with the force point PP side pushed up. The application point AP side of the swinging member 4 is pulled down, pulling down the second link member 6 and positioning the lifting member 3 at the lower end position LEP. The lower end of the lifting member 3 abuts against the abutment member CM, and the lifting member 3 is held horizontally. The rail 3r of the lifting member 3 is aligned with the lower transport rail LTR, and a pusher device (not shown) transfers the transported object W loaded on the cart C from the transport rail LTR to the rail 3r of the lifting member 3.

[0054] Next, the control device drives the electric motor EM to rotate the rotary arm 2 clockwise as shown in FIG. The swinging member 4 rotates clockwise around the fulcrum FP and pushes up the side of the application point AP, which pushes up the second link member 6 and causes the lifting member 3 to rise.

[0055] Next, the control device further rotates the rotating arm 2, positioning it at a position rotated 180 degrees from the initial position, as shown in Figure 8. At this time, the center of the rotary drive shaft RDS, the center of the first connecting part FCP, and the force point PP are aligned on a straight line tilted at 45 degrees, rather than on a vertical line as in the conventional case. Even in this case, the force applied to the rotating arm 2 from the swinging member 4 does not generate a rotational force, so the lifting member 3 is held in a stable position at the uppermost position REP.

[0056] The lifting member 3 is positioned at the upper end position REP, and the rail 3r is aligned with the upper transport rail UTR. The stopper member 8c abuts against the lower surface of the base frame BF and supports the lifting member 3 so that it is held in a horizontal position. The control device drives a pusher device (not shown) to move the transported object W from the rail 3r to the upper transport rail UTR, and sends it to the next process.

[0057] Next, the control device rotates the rotary arm 2 counterclockwise to lower the lifting member 3 to the lowermost position LEP, and aligns the rail 3r with the lower transport rail LTR. The same process is repeated thereafter.

[0058] As is clear from the above description, the electric lifting device 1 of the first embodiment comprises an electric motor EM, a rotating arm 2 that rotates around the axis of the rotary drive shaft RDS of the electric motor EM, a lifting member 3 that is supported by a guide rod 8 extending in the vertical direction and that lifts and lowers the transported object W on it, and a oscillating member 4 that is interposed between the rotating arm 2 and the lifting member 3 and has a force point PP to which a force is applied from the rotating arm 2 side, a fulcrum FP supported by the base frame BF, and an action point AP that rotates around the fulcrum FP due to the force applied to the force point PP and transmits the force from the force point PP side to the lifting member 3 side.

[0059] It also includes a first link member 5 that is interposed between the rotating arm 2 and the oscillating member 4, rotatably connected to the rotating arm 2 at a first connection part FCP on the rotating arm 2 side, and rotatably connected to the oscillating member 4 at a force point PP, and a second link member 6 that extends in the vertical direction between the oscillating member 4 and the lifting member 3, and rotatably connected to the oscillating member 4 and the lifting member 3, respectively.

[0060] When the lifting member 3 is at the upper end position REP and the lower end position LEP, the electric lifting device 1 has the center of the rotary drive shaft RDS, the center of the first connecting part FCP, and the force point PP aligned in a straight line, and the oscillating member 4 is arranged in a position where the force point PP and the fulcrum FP are not directly below the lifting member 4.

[0061] According to this, the drive mechanism that applies force to the fulcrum FP supported by the structure (base frame BF) and the force point PP, which is a large-scale structure, is located away from directly below the lifting member 3, so there are no restrictions on the installation space.

[0062] Furthermore, when the lifting member 3 is at the uppermost position REP or the lowermost position LEP, the center of the rotary drive shaft RDS, the center of the first connecting part FCP, and the force point PP are aligned on a straight line tilted from the vertical as shown in Figures 1 and 8, so that no rotational force based on the weight of the lifting member 3 acts on the rotary arm 2. This prevents a large load from being applied to the brake device attached to the drive motor, making it easy to maintain an accurate height position.

[0063] Furthermore, in the electric lifting device 1 of the first embodiment, the distance from the point of application AP to the fulcrum FP is longer than the distance from the point of force PP to the fulcrum FP.

[0064] According to this, because force is transmitted to the point of application AP by the rotation of the oscillating member 4, if a longer lifting stroke is required, this can be easily adjusted by making the distance between the fulcrum FP and the point of application AP longer than the distance between the force point PP and the fulcrum FP. Furthermore, by increasing the radius of rotation formed by the point of application AP and the fulcrum FP, the arc-shaped path approaches a straight line, thereby reducing the lateral load generated during lifting and lowering. This reduces wear on the guide rod 8 and prevents the lifting member from being unable to maintain its horizontal position.

[0065] The electric lifting device 1 of the first embodiment further includes a holding member 9 that has an insertion hole through which the guide rod 8 is inserted, penetrates and is fixed to the base frame BF, has an inner surface 9a that faces the outer surface of the guide rod 8 so as to resist a load that tilts the guide rod 8 relative to the vertical direction, and protrudes a predetermined distance above the base frame BF.

[0066] This allows the holding member 9 to reduce the lateral load acting on the guide rod 8 when it is extended during lifting and at the lifting end, thereby reducing the bending moment acting on the guide rod 8. This reduces the strength of the guide rod 8, reduces wear on the sliding parts, and also reduces costs.

[0067] In the first embodiment, the electric lifting device 1 has, at the lower end position LEP of the lifting member 3, multiple abutment members CM between the lifting member 3 and the base frame BF, which are adjusted in height so that they abut on an imaginary horizontal plane, thereby suppressing the tilt of the lifting member 3.

[0068] According to this, the lifting members 3 come into contact with the base frame BF in parallel by the multiple contact members CM. Therefore, the lifting members 3 are maintained in a horizontal state without tilting at the lower end position LEP, and it is possible to prevent a step from occurring between the lifting members 3 and the adjacent lower conveying path LCP. This allows the loading and unloading of the transported article W between the lifting members 3 and the adjacent lower conveying path LCP to be carried out safely and reliably.

[0069] The electric lifting device 1 of the first embodiment has multiple guide rods 8, and between an upper surface portion 8b having an upper surface provided at the lower part of the guide rod 8 and a lower surface provided on the base frame BF, there are multiple stopper members 8c that evenly contact the upper surface or the lower surface, and at the upper end position REP of the lifting member 3, the stopper members 8c suppress the inclination of the lifting member 3.

[0070] According to this, the lifting members 3 come into contact with the base frame BF in parallel by the multiple stopper members 8c. Therefore, the lifting members 3 are maintained in a horizontal state without tilting at the upper end position REP, and it is possible to prevent a step from occurring between the lifting members 3 and the adjacent upper conveying path UCP. This allows the load / unload of the transported article W between the lifting members 3 and the adjacent upper conveying path UCP to be performed safely and reliably.

[0071] Second Embodiment Next, a second embodiment of the electric lifting device of the present invention will be described below with reference to FIG.

[0072] The electric lifting device 201 of the second embodiment differs from the first embodiment in the swinging member 204 and the rotation shaft 204s. The other configurations are the same, so the same reference numerals are used and the description will be omitted. The differences will be mainly explained below.

[0073] Rotation axis 204s, which is a fulcrum FP that supports swing member 204, extends in the direction along the axis (Y-axis direction). It extends between bearing pedestal 207a on the side of second link member 6 provided in the center of base frame BF, and bearing pedestal 207b provided at one end of base frame BF in the Y-axis direction (the upper end in FIG. 9). Electric motor EM, rotating arm 2, and first link member 5 are disposed on one end side of base frame BF in the Y-axis direction.

[0074] A portion 204p of the swing member 204 to which the force point PP belongs is in a vertically upright state, and a portion 204a to which the action point AP belongs extends in a horizontal direction. Unlike the second embodiment, the portion 204p to which the force point PP belongs and the portion 204a to which the application point AP belongs are formed of separate members, and are not formed of a single, continuous plate material. Even in this case, the portion 204p to which the force point PP belongs and the portion 204a to which the application point AP belongs are integral with the same rotation axis 204s, and rotate around the same rotation axis 204s, so that the force applied to the force point PP is transmitted to the application point AP.

[0075] As is clear from the above description, in the electric lifting device 201 of the second embodiment, in the oscillating member 204, the rotation axis 204s that constitutes the fulcrum FP extends a predetermined distance in a direction along the axis of the rotation axis 204s, the part 204p to which the force point PP belongs and the part 204a to which the action point AP belongs are spaced apart from each other along the direction in which the rotation axis 204s extends, and the force point PP and the action point AP rotate within different vertical planes around the rotation axis 204s.

[0076] This makes it possible to change the portion 204p including the force point PP of the oscillating member and the portion 204a including the action point AP in accordance with the layout of the factory where the device is set up, thereby avoiding interference with other devices.

[0077] 1 and 9, the force point PP and the application point AP are disposed on either side of the fulcrum FP, but this is not limiting. For example, as shown in Fig. 10, the force point PP and the application point AP may be on the same side of the fulcrum FP. In addition, the position where the center of the rotation drive shaft RDS, the center of the first connecting part FCP, and the force point PP are aligned on a straight line is set to 45 degrees, but this is not limitative and may be, for example, 50 degrees or 40 degrees.

[0078] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to these descriptions. Various modifications that do not deviate from the scope of the claims and that are easily conceivable by those skilled in the art are also included in the present invention. [Explanation of symbols]

[0079] 1: electric lifting device, 2: rotating arm, 3: lifting member, 4: swinging member, 5: first link member, 6: second link member, 8: guide rod, 8b: upper surface portion, 8c: stopper member, 9: holding member, 9a: inner peripheral surface, 201: electric lifting device, 204a: part to which the point of application belongs, 204p: part to which the point of force belongs, 204s: rotating axis, AP: point of application, BF: base frame, CM: abutment member, EM: electric motor, FP: fulcrum, LEP: lowering end position, PP: force point, RDS: rotating drive shaft, REP: upper end position.

Claims

1. An electric motor; a rotary arm that rotates around the axis of the rotary drive shaft of the electric motor; a lifting member supported by a guide rod extending in the vertical direction and configured to lift and lower an object to be conveyed; a swinging member interposed between the rotating arm and the lifting member, the swinging member having a force point to which a force from the rotating arm side is applied, a fulcrum supported by a base frame, and a point of action which rotates around the fulcrum by the force applied to the force point and transmits the force from the force point side to the lifting member side; a first link member interposed between the rotating arm and the swinging member, rotatably connected to the rotating arm at a first connecting portion on the rotating arm side, and rotatably connected to the swinging member at the force point; a second link member extending in the vertical direction between the swinging member and the lifting member and rotatably connecting the swinging member and the lifting member, An electric lifting device in which, when the lifting member is at an upper end position or a lower end position, the center of the rotation drive shaft, the center of the first connecting portion, and the force point are aligned on a straight line, The swinging member is provided with the force point and the fulcrum at a position away from directly below the lifting member. Electric lifting device.

2. a holding member having an insertion hole through which the guide rod is inserted and fixed to the base frame, the holding member having an inner peripheral surface facing the outer peripheral surface of the guide rod so as to resist a load that tilts the guide rod relative to the vertical direction, and the holding member protruding a predetermined length above the base frame; 10. The apparatus of claim 1.

3. a plurality of contact members, the heights of which are adjusted so as to contact each other on an imaginary horizontal plane, between the lifting member and the base frame at the lowering end position of the lifting member; suppressing the inclination of the lifting member; 10. The apparatus of claim 1.

4. The guide rods are plural, a plurality of stopper members are provided between an upper surface portion having an upper surface provided at a lower portion of the guide rod and a lower surface provided on the base frame, the stopper members being in uniform contact with the upper surface or the lower surface; When the lifting member is at the raised end position, the stopper member prevents the lifting member from tilting.

10. The apparatus of claim 1.

5. In the rocking member, The rotation shaft constituting the fulcrum extends a predetermined distance in a direction along the axis of the rotation shaft, a portion to which the force point belongs and a portion to which the action point belongs are spaced apart from each other along a direction in which the rotation axis extends, The force point and the action point rotate within different vertical planes around the rotation axis.

10. The apparatus of claim 1.

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