JP4817846B2 - lift device - Google Patents

Description

  The present invention relates to a lifting device for a conveyed object.

  Conventionally, in an elevating device that moves an object to be conveyed in the vertical direction, a lifting platform for placing an object to be conveyed is directly connected to the upper part of a pneumatic or hydraulic cylinder accommodated in the elevating device, Alternatively, a sprocket can be pivotally attached to the upper part of the cylinder, and one end of the chain hung on the sprocket can be fixed to the elevator and the lower end can be fixed to the lower part of the elevator, and the elevator can be raised and lowered by driving the cylinder. You can see what you are doing.

  We do not conduct prior art searches at the research and development stage or application stage, and do not know the prior art documents to be described.

  However, since the lifting amount of the former lifting platform in the lifting device is only the cylinder stroke, and the lifting amount of the latter lifting platform is only twice the stroke of the cylinder, for example, the lifting device in which the cylinder is accommodated. There was a problem that had to be solved, for example, it was difficult to raise the object to be conveyed to the upper surface.

The present invention, the prior art based on, view of the problems can not be elevating the transported object than the function of the cylinder, the lifting platform of the object to be conveyed vertically movably on the front of the machine frame which is erected on the base Provided, a mounting table plate for the object to be transported is provided on the machine frame, a front end portion of the link rod is rotatably attached to the rear portion of the lifting platform, is erected on the base , and is disposed below the mounting table plate. The middle part of the link rod is pivotably attached to the lifting drive unit of the lifting platform to restrict the upward swinging of the link rod and to be able to swing downward, and the rear end of the link rod at the upper and rear part of the machine frame The abutment table is moved on the mounting plate by the lift by the lift drive unit and the downward swing after the link rod contacts the contact body. the raisable to be Rukoto to possible mounting positions, abut the rear end of the link rod is in abutment body From the top to the highest position, the lifting platform is pushed up by the link rod by the amount of elevation of the mounting portion of the mounting portion of the link rod tip to the lifting platform relative to the lifting drive unit, and more than the lifting amount by the lifting drive unit. The above-mentioned problem is solved by making the elevator platform movable.

In short, the present invention provides an elevator platform for a transported object on the front surface of a machine frame standing on a base so as to be movable up and down , a mounting table plate for the object to be transported on the machine frame, and a link plate at the rear part of the elevator platform. The front end of the link rod is pivotably mounted, and the intermediate portion of the link rod is pivotally mounted on the lifting drive unit of the lifting platform that is erected on the base and disposed below the mounting table plate . The upper swing and the rear of the machine frame are provided with an abutment body at the rear end of the link rod, and the lifting platform is lifted by the lifting drive unit and the link rod Since the object to be transported can be moved up to a position where it can be transferred onto the mounting base plate by raising by the downward swing after coming into contact with the contact body, the rear end of the link rod with respect to the contact body during raising and lowering When the part is in contact, the link rod is approximately centered on the attachment part to the lift drive unit with respect to the lift platform. , In the case of increase by upwardly swinging the case of downward swinging, lowering, it can be extra lift the lifting platform, thus more than the stroke of the elevation drive unit lifting table can be raised and lowered to.
Further, the elevating drive unit is composed of a cylinder erected on the base, a push-up body rotatably provided on the upper part of the cylinder, and a suspended linear body hung on the elevated body, and the suspended linear body Since one end of the shaft is pivotally attached to the middle part of the link rod and the other end is fixed to the base, the lifting amount of the lifting platform by the lifting drive unit can be double the cylinder stroke. Its practical effect is very significant, such as making the lifting device compact.

An embodiment of the present invention will be described below with reference to the drawings.
1 is a side view of a lifting device according to the present invention, FIGS. 2 and 3 are a plan view and a rear view of FIG. 1, and FIGS. 4 and 5 are the lowest and highest positions of the lifting platform. It is a principal part side view shown.
In the lifting device according to the present invention, mainly a lifting platform 3 provided on the front surface of the machine frame 2 standing on the base 1 so as to be movable up and down with respect to the machine frame 2, and both sides of the lifting table 3. A pair of link rods 4, 4 a having a front end portion rotatably attached to the rear portion, and an elevating drive unit 5 in which an intermediate portion of the link rods 4, 4 a is pivotally attached so that the elevator platform 3 can be raised and lowered; It is composed of the contact members 6 and 6a at the rear ends of the link rods 4 and 4a provided at the rear portion of the machine frame 2, and the link rods 4 and 4a can be controlled to swing upward and to swing downward. It is attached to the elevator 3 so that
Hereinafter, a specific description will be given.

In the elevator 3, as shown in FIGS. 1 to 5, a placing portion 8 for the object to be transported W is provided on the front portion of the elevator plate 7 that is attached to the machine frame 2 so as to be movable up and down. A link having a substantially L shape, formed with notches 9 and 9a having a lower opening on the side of the connecting portion of the elevating plate 7 with the mounting portion 8, and having front ends attached to both sides of the mounting portion 8. By allowing the intermediate part of the flanges 4 and 4a to pass through the notches 9 and 9a, the intermediate part of the link flanges 4 and 4a abuts on the upper parts of the notches 9 and 9a. Is regulated.
In the drawing, a guide rail is provided on the front surface of the machine frame 2 and an LM guide is provided on the rear surface of the elevator plate 7 of the elevator table 3 so that the elevator table 3 can be moved up and down smoothly relative to the machine frame 2.
Further, the machine frame 2 is formed in a gate shape, a mounting table 10 is provided on the machine frame 2, and a front end portion of the mounting table 10 is projected forward from the front surface of the machine frame 2.

The elevating drive unit 5 includes a cylinder 11 erected between a pair of vertical frames 2a and 2b of the machine frame 2 on the base 1, a pair of push-up bodies 12 and 12a provided on both upper sides of the cylinder 11, A pair of suspended linear bodies 13 and 13a hung on the push-up bodies 12 and 12a, and one end of the suspended linear bodies 13 and 13a is rotatably attached to an intermediate portion of the link rods 4 and 4a. The end is fixed to the base 1.
That is, if the stroke amount of the cylinder 11 is S, the ascending / descending length of the attachment ends of the suspended linear bodies 13, 13a to the link rods 4, 4a is 2S.

  The abutting bodies 6 and 6a are provided below the rear projecting ends of the brackets 14 and 14a fixed to the horizontal frame 2c in the machine frame 2, and the positions of the abutting bodies 6 and 6a are set to the cylinder 11 Before reaching the top dead center, it is set so that the rollers 15 and 15a that can be rotated contact the rear ends of the link rods 4 and 4a, specifically the rear ends of the link rods 4 and 4a. is doing.

In the drawing, the push-up bodies 12 and 12a are wheel-like and are pivotally attached to the outsides of brackets 17 and 17a provided at both lower portions of the mounting plate 16 at the top of the cylinder 11. The push-up bodies 12 and 12a are connected to pulleys and sprockets. The suspended linear bodies 13, 13a are ropes, belts, chains, etc. corresponding to the push-up bodies 12, 12a, preferably the push-up bodies 12, 12a are sprockets that are rotatable with respect to the cylinder 11, and the suspended lines The state bodies 13 and 13a are chained.
Then, by raising the push-up bodies 12 and 12a by the cylinder 11, the push-up bodies 12 and 12a rotate to wind up the suspended linear bodies 13 and 13a, and the lifting platform 3 rises.
Although the push-up bodies 12 and 12a are formed in a wheel shape in the drawing, the push-up bodies 12 and 12a are not limited to such a form. In the case of a circumferential surface, the push-up bodies 12 and 12a may be fixed to the cylinder 11. In this case, the suspended linear bodies 13 and 13a are in sliding contact with the push-up bodies 12 and 12a.

  Further, one end of the suspended linear body 13, 13a may be attached to a connecting rod (not shown) installed between the link rods 4 and 4a without being directly attached to the link rods 4 and 4a. It is only necessary that the link rods 4 and 4a can be rotated around the attachment portion with respect to 13 and 13a.

In the drawing, the elevating drive unit 5 is composed of a cylinder 11, push-up bodies 12, 12a, and suspended linear bodies 13, 13a. However, the present invention is not limited to this configuration. You may attach directly the intermediate part of 4 and 4a so that rotation is possible.
In short, the front ends of the link rods 4 and 4a are rotatably attached to the rear portion of the lifting platform 3, and the intermediate portions of the link rods 4 and 4a are connected to the lifting drive unit 5 of the lifting platform 3 standing on the base 1. The hooks 4 and 4a should just be attached with respect to the raising / lowering drive part 5 so that rotation is possible.
However, in the illustrated lifting and lowering device, the link rods 4 and 4a are attached to the deformable suspended linear bodies 13 and 13a. The attachment parts of the link rods 4 and 4a to the suspended linear bodies 13 and 13a can be moved slightly back and forth, but some attachment is given to the attachment parts of the link rods 4 and 4a and the lifting platform 3 or the lifting drive unit 5. Thus, there may be a case in which the lifting platform 3 and the lifting drive unit 5 are configured so as to reliably operate. For example, it is made to respond | correspond by inserting a shaft in the elongate hole provided in the raising-lowering base 3 side or the link rods 4 and 4a.

  Therefore, if the elevator 3 is directly connected to the elevator drive unit 5 side, the elevator 3 can only move up and down by the stroke amount of the elevator driver 5, but the link rods 4 and 4a attached to the elevator 3 so as to be rotatable. Since the elevating drive unit 5 side is connected via the elevating drive unit 5, the elevating drive unit 5 lifts the elevating table 3 via the link rods 4 and 4a, but the elevating table 3 is free with respect to the machine frame 2 side. Yes, since the link rods 4 and 4a are restricted from moving upward on the rear end side while being raised, the link rods 4 and 4a are gradually swung downward with respect to the elevator 3 to lift the elevator 3 Therefore, the lifting amount of the lifting / lowering table 3 depends on the lifting / lowering stroke by the lifting / lowering drive unit 5 and the additional lifting / lowering stroke by the swinging of the link rods 4 and 4a, that is, the lifting table 3 has the rear end of the link rods 4 and 4a Until the highest position is reached after contacting the contact body 6, 6a Increase amount with respect to the mounting portion of the elevation drive unit 5 of the attached site into lifting platform 3 of rods 4,4a tip so that is applied.

  In the illustrated lifting device, since it is an example of a device installed at the end portion of the conveying means T, the mounting portion 8 in the lifting platform 3 is placed between the front end portions of the pair of side frames 18a, 18b. In the upper part of a substantially U-shaped base frame 18 provided with a connecting frame 18c on the top, a transport means (roller conveyor 19 in the drawing) similar to the transport means T above the base frame 18 is installed. However, the present invention is not limited to such a form, and although not illustrated, the placement unit 8 may be a plate-like body or a frame-like body that has only a function of simply placing the transport target W.

In the drawing, the link rods 4 and 4a are pivotally attached to the inner side surfaces of the side frames 18a and 18b in the frame 18 of the mounting portion 8 and the intermediate portions thereof are formed on the lifting plate 7 in the drawing. However, the present invention is not limited to such a configuration, and although not shown, the link rods 4 and 4a whose end portions are pivotally attached to the outer surface of the mounting portion 8 are connected to the lifting plate 7. In this case, upward swing restricting means for the link rods 4 and 4a are provided on the outer surface of the elevating plate 7.
That is, the link rods 4 and 4a may be attached to the lifting platform 3 so as to restrict upward swing and allow downward swing.

Next, the operation of the lifting device according to the present invention will be described.
(1) After the article to be conveyed W is placed on the placing portion 8 of the lifting platform 3 at the lowest position, the raising / lowering driving portion 5 is operated, and the push-up bodies 12, 12a are raised as the cylinder 11 is extended. The lifting end 3 is lifted by twice the stroke of the cylinder 11 by pulling up the fixed end side of the suspended linear bodies 13 and 13a wound around the push-up bodies 12 and 12a toward the elevator 3 side.
(2) When the rear ends (the rollers 15 and 15a) of the link rods 4 and 4a come into contact with the contact bodies 6 and 6a during the ascent of the lifting platform 3, the rear ends (of the link rods 4 and 4a) Since the rise of the rollers 15, 15a) stops, the link rods 4, 4a swing downward with respect to the lifting platform 3, and accordingly the lifting platform 3 moves the front end side of the link rods 4, 4a toward the lifting drive unit 5 side. The elevator 3 swings upward around the attachment site, and the elevator 3 is lifted by the elevator drive unit 5.
(3) When the lifting platform 3 reaches the highest position, the lifting platform 3 stops, and the lifting platform 3 is attached to the lifting drive unit 5 side of the link rods 4 and 4a by twice the stroke of the cylinder 11. It rises by an amount obtained by adding the ascending portion of the attachment part to the lifting platform 3 of the link rods 4 and 4a for the part.

  As shown in FIGS. 4 and 5, limit switches 20 and 20 a are provided at predetermined positions in the upper and lower portions of the front surface of the machine frame 2, and an input element 21 is provided on the side of the elevator 3. By turning on the limit switch 20 and the upper limit switch 20a, the elevator 3 is stopped at the lowest and highest positions.

As shown in FIGS. 3 and 5, an upper damper 22 is provided at a predetermined position on the upper front surface of the machine frame 2, and an abutting plate 23 is provided on a side portion of the lifting platform 3. Further, as shown in FIG. 3, the lower damper 25 with which the contact plates 24, 24a projecting laterally from both ends of the mounting plate 16 on the upper side of the cylinder 11 are in contact with the lower part of the intermediate part of the machine frame 2; 25a is provided, and a lower stopper 34 that contacts the upper end surface of the cylinder 11 at the lowest position is provided on the lower surface of the mounting plate 16.
The contact plate 23 is in contact with the upper damper 22 near the highest position, and the contact plates 24 and 24a are in contact with the lower dampers 25 and 25a in the vicinity of the lowest position so as to cushion each other.

  As shown in FIGS. 1, 4, and 7, a carry-in prevention stopper 26 is provided at the front end portion of the base 1 and is located on the terminal side of the transport means T. A carry-in confirmation switch 27 is provided, and the carry-in prevention stopper 26 protrudes upward when the carry-in confirmation switch 27 is turned “ON” by the conveyed object W, and the next conveyed object W on the conveying means T is moved to the lifting platform 3 side. First, when the lower limit switch 20 is turned “ON”, the lower transfer switch 20 is immersed downward so that the next object to be conveyed W can be moved to the lifting platform 3 side.

  As shown in FIGS. 1, 2, and 4-9, drop prevention stoppers 28 and 28a are swingably provided on both sides of the front end of the lifting platform 3, and the fall prevention stoppers 28 and 28a have their initial postures in an upright state. It tilts with the transport of the transported object W, and returns to the standing state after the transported object W is transported.

As shown in FIG. 7, an advance prevention stopper 29 for the conveyed object W is provided at the rear of the elevating table 3 and on the upper part of the elevating plate 7, and the advance prevention stopper 29 is provided with a pair of guide shafts on both sides of the mounting block 30. 31 and 31a are penetrated, and upper end portions of the guide shafts 31 and 31a are fixed to both sides of the lower surface of the contact plate 32, and the upper biasing means 33 of the contact plate 32 is interposed between the guide shafts 31 and 31a. , 33a are provided.
Then, as shown in FIG. 8 (a), the upper surface of the contact plate 32 contacts the lower surface of the front projecting portion of the mounting table 10 while the lift table 3 is being raised, and the contact plate 32 stops. The block 30 ascends together with the elevator 3 and compresses the upper biasing means 33, 33a. Finally, as shown in FIG. 8 (b), the upper surface of the contact plate 32 at the highest position is in the elevator 3 The contact state of the contact plate 32 with the mounting table plate 10 is maintained by the upper biasing means 33 and 33a in a compressed state until the lift table 3 is lowered to a predetermined position. After that, it is separated and returned to the initial state so that the upper surface of the contact plate 32 is positioned above the placement surface of the article W to be transported in the elevator 3. That is, the advance prevention stopper 29 itself serves as an upper stopper of the lifting platform 3.

  As shown in FIG. 9, a drop prevention device 35 for the lifting platform 3 is provided on the upper part of the machine frame 2, and a protruding and retracting body 36 that can be moved back and forth in the front-rear direction of the fall prevention device 35 is provided on the side of the lifting platform 3. When the body 37 is provided, and the upper / lower platform 3 reaches the highest position and the upper limit switch 20a is turned “ON”, the retractable body 36 in the fall prevention device 35 protrudes forward and abuts the tip of the retractable body 36. The retractable body 36 in the fall prevention device 35 is retracted and retracted when the upper limit switch 20a is turned OFF simultaneously with the lowering of the lifting platform 3 or when the upper limit switch 20a is turned off.

It is a side view of the raising / lowering apparatus which concerns on this invention. It is a top view of FIG. FIG. 2 is a rear view of FIG. 1. It is a principal part side view of the raising / lowering apparatus which made the raising / lowering stand the lowest position. It is a principal part side view of the raising / lowering apparatus which made the raising / lowering stand the highest position. (A) is principal part sectional drawing of the raising / lowering apparatus which shows the state which the rear-end part of the link rod contact | abutted to the contact body, (b) is principal part sectional drawing of the raising / lowering apparatus which made the raising / lowering stand the highest position. is there. It is principal part sectional drawing of the raising / lowering apparatus which made the raising / lowering stand the lowest position. (A) is principal part sectional drawing of the raising / lowering apparatus which shows the state which the contact plate in a stopper contact | abutted to the mounting base plate, (b) is principal part sectional drawing of the raising / lowering apparatus which made the raising / lowering base the highest position. . It is a principal part side view of the raising / lowering apparatus which installed the fall prevention apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Machine frame 3 Lifting platform 4, 4a Link rod 5 Lifting drive part 6, 6a Contact body
11 cylinders
12, 12a Push-up body
13, 13a Suspended linear body

Claims (2)

A lifting platform for the object to be transported is provided on the front surface of the machine frame standing on the base so that it can be moved up and down , a loading table for the object to be conveyed is provided on the machine frame, and the front end of the link rod is rotated at the rear of the lifting table. Mounted movably, upright on the base and attached to the lifting drive of the lifting platform located below the mounting plate so that the middle portion of the link rod can be pivoted, and the upward swinging of the link rod is restricted In addition, a contact body of the rear end of the link rod is provided at the upper part and rear part of the machine frame, and the lifting platform is moved up by the lifting drive unit and the contact body of the link rod to the contact body. An elevating apparatus characterized in that it can be raised to a position at which a transferred object can be transferred onto a mounting table plate by raising by a downward swing after contact . The elevating drive unit is composed of a cylinder erected on the base, a push-up body pivotably provided on the upper part of the cylinder, and a suspended linear body hung on the elevated body, and one end of the suspended linear body The lifting device according to claim 1, wherein the shaft is rotatably attached to an intermediate portion of the link rod and the other end is fixed to the base.

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