JP2016050084A - Vacuum lift device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assemblability, maintainability, operational reliability, and durability of a vacuum lift device.SOLUTION: A vacuum lift device 100 comprises: a cylinder 1; a piston 2 slidably provided in the cylinder 1; a suction pad 6 disposed in close contact with the surface of an object M being conveyed, and configured to suck the object M according to the drive of the piston 2 and to separate the sucked object M; a valve device 11 and valve switch unit 41 disposed outside the cylinder 1. The valve switch unit 41 comprises: a rotation shaft rotatably supported by a main cylindrical part 42; a ratchet wheel and cam member attached to the rotation shaft; and a ratchet wheel drive member that rotates the rotation shaft via the ratchet wheel. Using a pressing member 4 attached to a piston rod 2a, the ratchet wheel drive member is pushed down to switch the valve device 11 by means of the cam member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a non-powered vacuum lift device that vacuum-sucks a heavy-weight transport object without power, and in particular, the arrangement and configuration of a valve device and a valve switching unit for automatically attaching and detaching the transport object. About.

  The non-powered vacuum lift device is a type of vacuum lift device that does not require power such as a vacuum pump to generate a vacuum for vacuum-sucking a conveyed product. This type of vacuum lift device is formed by a cylinder, a piston slidably provided in the cylinder, a suction pad that is in close contact with the surface of the conveyed product, an inner surface of the suction pad, and a surface of the conveyed product. A valve device that allows or shuts off the introduction of outside air into the vacuum chamber, and a valve device that is opened and closed as needed to lift and lower the transported object using a crane, etc. And a valve switching unit that alternately switches to a vacuum state in which it is possible or a normal pressure state in which the conveyed product can be removed. When lifting the conveyed product, the valve mechanism provided in the valve device is closed to block the flow of outside air into the vacuum chamber, and the pressure in the vacuum chamber is maintained in a vacuum state. Further, when the conveyed product is suspended, the valve mechanism provided in the valve device is opened to allow the outside air to flow into the vacuum chamber, and the pressure in the vacuum chamber is returned to the normal pressure state.

  The valve switching unit is either a manual type that manually switches the valve mechanism while visually checking the working state, or an automatic type that automatically switches the valve mechanism according to the lifting / lowering operation of the piston. There is a thing. As a non-powered vacuum lift device equipped with an automatic valve switching unit, a valve device and a valve switching unit that have been incorporated in a cylinder have been proposed (see, for example, FIG. 1 of Patent Document 1). ).

Japanese Patent Publication No.46-12781

  However, in the vacuum lift device described in Patent Document 1, since the valve device (guide cylinder) and the valve switching unit (tooth cylinder) are incorporated in the outer cylinder, a great deal of labor is required for the assembly and maintenance of the vacuum lift device. Cost. In addition, the vacuum lift device described in Patent Document 1 uses a flexible sheet gasket as an essential component, but there is a problem in durability because the sheet gasket is easily broken during use.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a vacuum lift device that is excellent in assembling and maintenance properties and excellent in durability. .

  In order to solve the above problems, the present invention is in close contact with a cylinder, a piston disposed in the cylinder, and a surface of the conveyed product, and the adsorption of the conveyed product and the adsorbed conveyed material according to the driving of the piston. A suction pad for detachment, a valve device that allows or blocks the introduction of outside air into the vacuum chamber formed by the inner surface of the suction pad and the surface of the transported object, and every time the piston is lifted and lowered In a non-powered vacuum lift device comprising a valve switching unit that opens and closes the valve device to automatically switch the pressure in the vacuum chamber alternately between a vacuum state and a normal pressure state, the valve device and the valve The switching unit is arranged outside the cylinder, and is formed integrally with the piston, and the upper part is disposed in front of the piston rod protruding outside from the upper surface of the cylinder. A pressing member for operating the valve switching unit is provided, and the pressing member rotationally drives a rotating shaft provided in the valve switching unit in one direction each time the piston is suspended and operated, and the valve device The valve mechanism is switched from the open state to the closed state, or alternately from the closed state to the open state.

  When the valve device and valve switching unit are arranged outside the cylinder, the structure of the vacuum lift device can be simplified compared to the case where these devices and mechanisms are incorporated inside the cylinder, thus facilitating the assembly and maintenance of the vacuum lift device. it can. Further, when the rotary shaft provided in the valve switching unit is driven to rotate in one direction by using a pressing member provided on the piston rod, thereby switching the valve mechanism of the valve device, the valve switching unit includes the pressing member. Since it is only necessary to provide a power conversion unit that converts the pressing force into the rotational motion of the rotary shaft, the configuration of the valve switching unit can be simplified. Therefore, a non-powered vacuum lift device can be manufactured at a low cost and its operation reliability can be enhanced. Furthermore, since a flexible sheet gasket is not required for generating the vacuum, the durability of the vacuum lift device can be enhanced.

  Further, the present invention provides the vacuum lift device having the above-described configuration, wherein the valve device includes a valve main body in which a valve seat is formed, a movable shaft slidably attached to the valve main body, and the movable shaft provided on the movable shaft. A valve body that is combined with the valve seat to form a valve mechanism; and a first spring member that urges the valve body in a direction to separate the valve body from the valve seat. The valve switching unit is rotatable on the casing. An attached rotating shaft, a claw wheel and a cam member fixed to the rotating shaft, and a pressing force of the pressing member to the claw wheel every time the pressing member descends to intermittently move the rotating shaft. And a pinion wheel drive member that rotates, and the tip of the movable shaft biased by the first spring member is elastically contacted with the cam surface of the cam member.

  The valve switching unit automatically opens and closes the valve mechanism provided in the valve device each time the piston is lifted or lowered to automatically adjust the pressure in the vacuum chamber formed by the inner surface of the suction pad and the surface of the transported object. It is an apparatus for alternately switching to a vacuum state in which the conveyed product can be adsorbed or a normal pressure state in which the conveyed product can be detached. In the valve switching unit having the above configuration, the pinion wheel and the cam member are fixed to the rotating shaft, and the tip of the movable shaft provided in the valve device is elastically contacted with the cam surface of the cam member. The claw wheel and the cam member are intermittently rotated via the claw wheel driving member, and the movable shaft is displaced in the axial direction along the contour curve of the cam member. Therefore, by setting the contour curve of the cam member to an appropriate shape, the valve mechanism of the valve device can be alternately switched from the open state to the closed state or from the closed state to the open state each time the pressing member descends once. It becomes possible. Since the valve switching unit of this configuration can be configured with only a rotating shaft that is rotatably attached to the casing, and a pinion wheel and a cam member fixed to the rotating shaft, the valve switching unit can be manufactured at low cost. Since the structure is simple, the durability and reliability of the valve switching unit and thus the vacuum lift device can be improved.

  According to the present invention, in the vacuum lift device having the above-described configuration, a spherical body in contact with the cam surface of the cam member is rotatably provided at the tip of the movable shaft.

  If a spherical body is rotatably provided at the tip of the movable shaft, the frictional force acting between the cam surface and the tip of the movable shaft can be reduced, so that the rotation of the cam member and thus the switching operation of the valve mechanism can be made smooth. Can do.

  Moreover, this invention is a vacuum lift apparatus of the said structure, The said pinion drive member is a rod member attached to the said casing slidably, One end is attached to the said rod member, The said rod member is the said press member. It is made up of an elastic pressing member that presses the ratchet wheel in a specific direction when it is pushed down by.

  The claw wheel is formed with a plurality of claw portions on the outer periphery, and rotates in one direction by pressing one of the claw portions with the claw wheel driving member. The claw wheel drive member inevitably interferes with the outer periphery of the claw wheel. Therefore, if the ratchet wheel driving member is formed of a rigid body, the driving of the ratchet wheel driving member tends to be unsmooth when the ratchet wheel driving member is raised. On the other hand, when the claw wheel is pressed using the elastic pressing member, even when the elastic pressing member and the claw wheel interfere with each other when the elastic pressing member is lifted, the elastic pressing member is elastically deformed in a direction to escape from the claw wheel. Therefore, the raising operation of the elastic pressing member can be made smooth.

  According to the present invention, in the vacuum lift device having the above-described configuration, the rod member is provided with an interval adjusting member for adjusting an interval between the rod member and the pressing member.

  The rod member provided in the valve switching unit is pressed by a pressing member that moves up and down integrally with the piston, and intermittently drives the rotation shaft through the elastic pressing member. The cam member fixed to the rotating shaft drives a movable shaft provided in the valve device to open and close the valve mechanism. Accordingly, when the rod member is provided with a gap adjusting member for adjusting the gap between the pressing member and the rod member, the timing at which the pressing member and the rod member abut can be adjusted, so that the opening / closing timing of the valve mechanism can be adjusted appropriately. Thus, the conveyance object can be smoothly adsorbed or separated by the adsorption pad.

  According to the present invention, in the vacuum lift device having the above-described configuration, rotation of the claw wheel by the claw wheel driving member is allowed, and the claw wheel is rotated in a direction opposite to a rotation direction of the claw wheel by the claw wheel driving member. The reverse rotation preventing member for preventing the rotation is provided in the valve device or the valve switching unit.

  According to this configuration, since the reverse rotation of the claw wheel can be prevented by the reverse rotation prevention member, the rotated claw wheel can be stably held at a predetermined rotation position. Therefore, each time the pressing member descends, the claw wheel can be reliably rotated by a predetermined angle, and the operation stability of the valve switching unit can be improved.

  According to the present invention, in the vacuum lift device having the above configuration, the reverse rotation preventing member is formed of an elastic plate.

  When the anti-reverse member is formed with the elastic plate, the tip of the anti-reverse member is elastically contacted with one claw portion constituting the claw wheel when the claw wheel drive member is lifted, so that the claw wheel can be stably at a predetermined rotational position. Can hold. In addition, when the claw wheel is rotated by the claw wheel driving member, the claw wheel is pushed and elastically deformed, so that the claw wheel can be rotated. When the anti-reverse member is formed with an elastic plate, such a complicated function can be realized with a simple configuration, so that the valve switching unit can be reduced in size and cost, and the operational stability can be improved.

  According to the present invention, since the valve device and the valve switching unit are arranged outside the cylinder, it is possible to reduce the cost of the vacuum lift device and facilitate maintenance compared to the case where these devices and mechanisms are incorporated inside the cylinder. be able to. Further, since the rotary shaft of the valve switching unit is rotationally driven in one direction using the pressing member provided on the piston rod, the configuration of the valve switching unit can be simplified. Furthermore, since a flexible sheet gasket is not required for generating the vacuum, the durability of the vacuum lift device can be enhanced.

It is a front view of the vacuum lift apparatus concerning an embodiment. It is a side view of the vacuum lift apparatus concerning an embodiment. It is a circuit diagram of the vacuum lift apparatus which concerns on embodiment when a valve apparatus is switched to an open state. It is a circuit diagram of the vacuum lift device concerning an embodiment when a valve device is changed into a closed state. It is sectional drawing which shows the rotation position of the cam member when the structure of the valve apparatus which concerns on embodiment, and a valve mechanism are switched to an open state. It is sectional drawing which shows the rotation position of the cam member when the structure of the valve apparatus which concerns on embodiment, and a valve mechanism are switched to a closed state. It is a disassembled perspective view of the valve switching unit concerning an embodiment. It is a front view of a claw wheel concerning an embodiment. It is explanatory drawing which shows the operation | movement of the claw wheel and claw wheel drive member which concern on embodiment, and the function of a reverse rotation prevention member. It is a front view of the vacuum lift apparatus concerning other embodiments.

  Hereinafter, an embodiment of a vacuum lift device according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 to 4, a vacuum lift device 100 according to the embodiment is formed integrally with a cylinder 1, a piston 2 slidably disposed in the cylinder 1, and the piston 2, and an upper portion is a cylinder. A piston rod 2a protruding outward from the upper surface of 1, a suspension hook 3 provided at the upper end of the piston rod 2a, a pressing member 4 fixed to the upper portion of the piston rod 2a and disposed in a horizontal direction, A suction pad 6 attached to the lower part of the cylinder 1 using bolts 5 is provided. A valve mounting plate 8 is mounted on the outer surface of the cylinder 1 using bolts 7. A valve device 11 is mounted on the outer surface of the valve mounting plate 8 using bolts or the like (not shown). A valve switching unit 41 is attached using a bolt 10. Further, between the upper end portion of the valve switching unit 41 and the lower surface of the pressing member 4, an interval adjusting member 12 that connects these two members is provided. Moreover, between the bottom chamber 1a of the cylinder 1 and the valve device 11, between the rod chamber 1b of the cylinder 1 and the valve device 11, and between the valve device 11 and the suction pad 6, respectively, using piping hoses 13, 14, 15 respectively. It is connected. Furthermore, a silencer 16 for preventing or suppressing the generation of intake / exhaust noise is attached to a required opening of the valve device 11. As shown in FIG. 1, the vacuum lift device 100 according to the embodiment is suspended by a crane C, and sucks a conveyed product M by a suction pad 6 to a required position. The pressing member 4 only needs to be able to contact the interval adjusting member 12, and the planar shape thereof can be formed in an arbitrary shape such as a circle or a rectangle. Moreover, in FIG.3 and FIG.4, the code | symbol 17 has shown the air filter.

  As shown in FIGS. 1 and 2, the suction pad 6 is attached to the lower part of the cylinder 1 using bolts 5 and a skirt-like attached to the lower peripheral portion of the lower surface of the board 21 using bolts 22. It is comprised from the elastic adsorption part 23. FIG. The elastic adsorption part 23 is formed using a material having rubber-like elasticity. Therefore, as shown in FIGS. 1 and 2, when the tip of the suction pad 6 comes into contact with the surface of the conveyed product M, a vacuum chamber 24 is formed between the inner surface of the suction pad 6 and the surface of the conveyed product M. It is formed. By setting the pressure in the vacuum chamber 24 to a negative pressure, the conveyed product M can be vacuum-sucked to the suction pad 6. Further, by returning the pressure in the vacuum chamber 24 to normal pressure, the conveyed product M adsorbed on the suction pad 6 can be detached.

  As shown in FIGS. 5 and 6, the valve device 11 is slidably held by the valve main body 32 in which the valve seat 31 is formed, and the upper end portion protrudes from the upper surface of the valve main body 32 to the outside. The movable shaft 33, the first spring member 34 that constantly biases the movable shaft 33 upward, and the movable shaft 33 attached to the movable shaft 33 and lowered against the elastic force of the first spring member 34. It sometimes has a valve body 35 that contacts the valve seat 31. In the present specification, the combination of the valve seat 31 and the valve body 35 is referred to as a “valve mechanism”. Air circulation holes 36 and 37 are opened in the valve body 32 above and below the valve mechanism 32. In addition, a spherical body 38 called a free bearing is rotatably provided at the upper end of the movable shaft 33 to reduce the frictional force acting between the cam member 47 provided in the valve switching unit 41. Further, a reverse rotation preventing member 39 for preventing reverse rotation of the ratchet wheel 46 provided in the valve switching unit 41 is provided on the upper surface of the valve device 11. The reverse rotation preventing member 39 is formed with an elastic plate, and the lower end portion is screwed to the upper surface of the valve device 11 and the tip end portion is in contact with the tip end of one claw portion formed in the claw wheel 46. . The function of the reverse rotation preventing member 39 will be described in detail later with reference to FIG.

  As shown in FIGS. 5 and 6, the valve mechanism of the valve device 11 is opened and closed by the rotation of a cam member 47 provided in the valve switching unit 41. That is, as shown in FIG. 5, in a state where the spherical body 38 is in contact with a portion where the lift amount of the cam member 47 is small, the movable shaft 33 is lifted by the elastic force of the first spring member 34. The valve body 35 provided in 33 is separated from the valve seat 31 formed in the valve body 32, and the valve mechanism is switched to the open state. On the other hand, as shown in FIG. 6, in a state where the spherical body 38 is in contact with the portion where the lift amount of the cam member 47 is large, the movable shaft 33 resists the elastic force of the first spring member 34. Since it descends, the valve body 35 provided on the movable shaft 33 is pressed against the valve seat 31 formed on the valve body 32, and the valve mechanism is switched to the closed state. The configuration and operation of the valve switching unit 41 will be described later in detail.

  As shown in FIG. 7, the valve switching unit 41 is mainly composed of a main cylindrical portion 42 and a cap member 44 fixed to the upper end portion of the main cylindrical portion 42 using a bolt 43. In FIG. 7, in order to facilitate understanding, the diameter of the main cylindrical portion 42 is drawn larger than the diameter of the cap member 44. Further, the diameter of the main cylindrical portion 42 is formed to be substantially the same as the diameter of the valve device 11.

  A rotation shaft 45 is bridged to the main cylindrical portion 42 so as to be rotatable in the radial direction, and a claw wheel 46 and a cam member 47 are attached to the rotation shaft 45. The claw wheel 46 and the cam member 47 are each fixed to the rotating shaft 45 by using a bolt 48. The distal end portion of the movable shaft 33 provided in the valve device 11 is elastically contacted with the cam surface 47 a formed on the outer periphery of the cam member 47 by the elastic force of the first spring member 34 provided in the valve device 11. (See FIGS. 5 and 6). Since the spherical body 38 is rotatably provided at the distal end portion of the movable shaft 33, the frictional resistance acting between the cam surface 47a and the movable shaft 33 as the cam member 47 rotates can be reduced, and the cam member 47 and the operation of the movable shaft 33 can be made smooth.

  As shown in FIGS. 5 and 6, the cam surface 47 a of the cam member 47 changes the lift amount of the movable shaft 33 from large to small and from small to large each time the rotating shaft 45 rotates 90 degrees. Thus, a contour curve is formed. The lift amount of the contour curve formed at a position of 180 ° via the axis of the rotation shaft 45 is adjusted to be the same.

  As shown in FIG. 8, the claw wheel 46 includes four claw portions 50 a, 50 b, 50 c, 50 d that are equally formed at intervals of 90 ° on the circumference centered on the axis of the rotation shaft 45, With respect to the rotation direction of the vehicle 46, there are four relief portions 51a, 51b, 51c, 51d formed on the rear side of the claw portions 50a, 50b, 50c, 50d. Reference numeral 52 in the drawing denotes a bolt hole for screwing the bolt 48. The outer end of the bolt 48 is disposed flush with the outer surface of the claw wheel 46 or on the inner side of the outer surface of the claw wheel 46 so as not to hinder the sliding of the elastic pressing member 52 described later. The same applies to the bolt 48 that fixes the cam member 47 to the rotating shaft 45.

  As shown in FIG. 7, the cap member 44 is formed in a columnar shape that can be attached to the upper end portion of the main cylindrical portion 42, and includes a rod member 51, an elastic pressing member 52, and a second spring member 53. A car driving member 54 and a stopper member 55 for preventing the rotation and dropping of the claw wheel driving member 54 are attached. The stopper member 55 is fixed to the cap member 44 using a bolt 56. Therefore, a storage groove 57 for the stopper member 55 is formed on the upper surface of the cap member 44, and a screw hole 58 for screwing the bolt 56 is formed in the center of the bottom surface of the storage groove 57. . Further, the cap member 44 is provided with an insertion hole 59 for the rod member 51 penetrating from the upper surface to the lower surface and a through hole 60 for the bolt 43 for fastening the cap member 44 to the main cylindrical portion 42. The insertion hole 59 of the rod member 51 is formed so that a part thereof overlaps the storage groove 57 of the stopper member 55.

  The rod member 51 is a substantially cylindrical member having a diameter that can be inserted into the insertion hole 59, and a length that allows an upper end and a lower end to protrude from the upper surface and the lower surface of the cap member 44. A flange 61 for engaging the upper end of the second spring member 53 is formed. Further, a mounting hole 62 for the interval adjusting member 12 is formed on the upper surface of the rod member 51. Further, a first flat portion 64 having a mounting hole 63 for the elastic pressing member 52 is formed in an intermediate portion of the outer surface of the rod member 51, and a mounting hole 66 for a retaining pin 65 is formed in a lower portion thereof. A second flat portion 67 is formed. The elastic pressing member 52 is attached to the first flat portion 64 of the rod member 51 using a screw 68 screwed into the attachment hole 63. Further, the retaining pin 65 is attached to the second flat portion 67 of the rod member 51 by means such as press fitting or screwing into the attachment hole 66.

  The interval adjusting member 12 includes a bolt 12 a that is screwed into a mounting hole 62 formed on the upper surface of the rod member 51, and a nut 12 b that is screwed to the bolt 12 a and fastened to the upper surface of the rod member 51. be able to. When the gap adjusting member 12 is provided at the upper end of the rod member 51, the contact timing of the pressing member 4 and the bolt 12a when the pressing member 4 moves downward by changing the screwing amount of the bolt 12a to the rod member 51. Therefore, the opening / closing timing of the valve mechanism can be appropriately adjusted, and the suction or desorption of the conveyed product M by the suction pad 6 can be performed smoothly.

  When assembling the valve switching unit 41, first, one end of the rotating shaft 45 is passed through one of two unillustrated rotating shaft through holes provided in the main cylindrical portion 42 from the outside of the main cylindrical portion 42, and the main cylindrical portion 42. The ratchet wheel 46 and the cam member 47 are sequentially mounted on the rotating shaft 45 that has entered inside. Next, the other end of the rotating shaft 45 inserted into the main cylindrical portion 42 is passed through the other rotating shaft through hole provided in the main cylindrical portion 42, and both ends of the rotating shaft 45 are supported by the main cylindrical portion 42. Next, a snap ring (not shown) is engaged from the outside of the main cylindrical portion 42 with an engagement groove 45 a formed at the end of the rotary shaft 45, so that the rotary shaft 45 is rotatably held on the main cylindrical portion 42. Thereafter, the pinion wheel 46 and the cam member 47 are fixed to the rotating shaft 45 by using the bolt 48.

  On the other hand, with respect to the cap member 44, after the second spring member 53 is mounted on the outer periphery of the rod member 51, the tip end portion of the rod member 51 is inserted into the rod member insertion hole 59 provided in the cap member 44. Next, the second spring member 53 is compressed, and a stopper member is placed in the stopper member housing groove 57 formed in the cap member 44 in a state where a gap is opened between the lower end portion of the second spring member 53 and the cap member 44. 55 is inserted, and the stopper member 55 is fixed to the cap member 44 using the bolt 56. Next, the elastic pressing member 52 is attached to the first flat surface portion 64 of the rod member 51 protruding downward from the cap member 44 by using a screw 68, and the second flat surface portion 67 of the rod member 51 is press-fitted, screwed, or the like. The retaining pin 65 is attached using means. This prevents the rod member 51 from falling off the cap member 44. In this state, the rod member 51 is always urged upward with respect to the cap member 44 by the elastic force of the second spring member 53, and the side surface of the stopper member 55 is placed on the first flat portion 64 of the rod member 51. Are in sliding contact. Therefore, rotation of the rod member 51 with respect to the cap member 44 is prevented. Next, the bolt 12a is fastened to the mounting hole 62 of the gap adjusting member 12 formed on the upper surface of the rod member 51, and the nut 12b is fastened to the rod member 51 so that the rod member 51 and the gap adjusting member 12 are integrated. To do. The rod member 51 and the interval adjusting member 12 can be integrated before the rod member 51 is inserted into the rod member insertion hole 59.

  The cap member 44 on which the rod member 51, the elastic pressing member 52, the second spring member 53, the stopper member 55, the retaining pin 65, and the interval adjusting member 12 are mounted has the rotating shaft 45, the claw wheel 46, and the cam member 47. Fastened to the upper end of the main cylindrical portion 42 using bolts 43. As a result, as shown in FIG. 9A, the distal end portion of the elastic pressing member 52 is disposed opposite to one claw portion 50 a formed on the claw wheel 46. As described above, since the rod member 51 is attached to the cap member 44 so as not to rotate, even if the rod member 51 is repeatedly moved up and down, the distal end portion of the elastic pressing member 52 remains at the set position of the claw wheel 46. Thus, the claw wheel 46 can be driven stably. Further, the valve switching unit 41 to which the cap member 44 is attached is integrally connected to the valve device 11 using a bolt or the like (not shown). As a result, as shown in FIGS. 5 and 6, the cam surface 47 a of the cam member 47 is elastically contacted with the spherical protrusion 38 formed at the upper end of the movable shaft 33 by the elastic force of the first spring member 34, and reversely rotated. The tip of the prevention member 39 is engaged with one of the claw portions formed on the claw wheel 46.

  Hereinafter, the operation of the vacuum lift device according to the embodiment will be described.

  First, in a state where the vacuum lift device 100 in which the conveyed product M is not adsorbed by the suction pad 6 is suspended from the crane C, the cylinder 1 is lowered with respect to the piston 2 due to the weight of the cylinder 1, so that the interval adjusting member 12 is separated from the pressing member 4, and the rod member 51 is pushed up by the elastic force of the second spring member 53. Accordingly, in this state, the elastic pressing member 52 rises together with the rod member 51, and the engagement between the elastic pressing member 52 and the ratchet wheel 46 is released as shown in FIG. Further, in this state, as shown in FIG. 5, the movable shaft 33 is in contact with a portion where the lift amount of the cam surface 47a is small. For this reason, the movable shaft 33 is pushed up by the elastic force of the first spring member 34, the valve body 35 is separated from the valve seat 31, and the valve mechanism is opened.

  When the suction pad 6 is placed on the surface of the transported object M from this state and the tension applied to the hanging hook 3 is removed, the tip of the suction pad 6 comes into close contact with the surface of the transported object M due to the weight of the vacuum lift device 100. Is done. In this state, as described above, since the valve mechanism is in the open state, air in the bottom chamber 1a of the cylinder 1 is released to the outside through the valve device 11 and the silencer 16, and A considerable amount of air is supplied to the rod chamber 1 b of the cylinder 1 through the valve device 11 and the silencer 16. Accordingly, the piston 2 and the pressing member 4 integrated with the piston 2 are lowered by their own weight. For this reason, the rod member 51 is pushed into the cap member 44 via the interval adjusting member 12, and the elastic pressing member 52 integrated with the rod member 51 is lowered. The elastic pressing member 52 that has started to descend comes into contact with one claw portion 50a formed on the claw wheel 46, and rotates the claw wheel 46 from the state shown in FIG. 9B to the state shown in FIG. 9F. FIG. 9 (b) shows the state of the ratchet wheel 46 immediately after the start of rotation, and FIGS. 9 (c) to 9 (f) show 22.5 °, 45 °, 67 from the state of FIG. 9 (a), respectively. The state of the claw wheel 46 when rotated by 5 ° and 90 ° is shown. When the ratchet wheel 46 is pressed and rotated by the elastic pressing member 52, the reverse rotation preventing member 39 is elastically deformed in the plate thickness direction by being pushed by the ratchet wheel 46, so that the rotation of the ratchet wheel 46 is inhibited. Absent.

  When the ratchet wheel 46 is rotated 90 ° from the state shown in FIG. 9A, the reverse rotation preventing member 39 is engaged with the claw portion 50b of the ratchet wheel 46 as shown in FIG. 9F, and as shown in FIG. Further, the cam member 47 rotates 90 °, and the movable shaft 33 comes into contact with a portion where the lift amount of the cam surface 47a is large. Thereby, the movable shaft 33 is pushed down against the elastic force of the first spring member 34, and the valve body 35 attached to the movable shaft 33 is brought into contact with the valve seat 31 formed in the valve body 32. The valve mechanism is switched to the closed state. In this state, since the reverse rotation prevention member 39 is engaged with the claw portion 50b of the claw wheel 46, even if a force in the reverse rotation direction acts on the claw wheel 46, an external force in the compression direction is applied to the reverse rotation prevention member 39. Since the reverse rotation preventing member 39 does not elastically deform in the plate thickness direction, the reverse rotation of the ratchet wheel 46 is prevented.

  Next, when the piston 2 is lifted by using the crane C from this state, the air in the vacuum chamber 24 moves to the bottom chamber 1a of the cylinder 1 and the air in the rod chamber 1b of the cylinder 1 passes outside through the silencer 16. Since it is discharged, the piston 2 moves upward with respect to the cylinder 1, and the degree of vacuum in the vacuum chamber 24 increases. Further, when the piston 2 moves upward with respect to the cylinder 1, the pressing member 4 rises accordingly, so that the rod member 51 and the elastic pressing member 52 are pushed up by the elastic force of the second spring member 53, and the elastic pressing member. 52 and the engagement wheel 46 are disengaged again. At this time, the rotation positions of the ratchet wheel 46 and the cam member 47 are maintained at a position where the valve mechanism is maintained in the closed state by the reverse rotation prevention member 39, so that the conveyed product M is vacuum-sucked by the suction pad 6, and the crane C It becomes possible to transport the transported object M.

  When the elastic pressing member 52 is raised, in the process, as shown in FIG. 9G, the tip of the elastic pressing member 52 comes into contact with the claw wheel 46, but in FIG. 9H and FIG. As shown, since the elastic pressing member 52 is elastically deformed by the reaction force from the ratchet wheel 46, the elastic pressing member 52 can get over the escape portion 51a. Therefore, the tip end portion of the elastic pressing member 52 is not engaged with the claw wheel 46, and the claw wheel driving member 54 can be operated smoothly. The elastic pressing member 52 moves over to the next initial state shown in FIG. 9 (j) after getting over the escape portion 51a.

  After the transported object M vacuum-adsorbed on the suction pad 6 is transported to a required transport destination, when the tension applied to the hanging hook 3 is removed, the piston 2 and the pressing member 4 that operates integrally with the suspension hook 3 are moved by their own weight. Since it descends, the pressing member 4 presses the distance adjusting member 12, and the rod member 51 of the valve switching unit 41 is pushed into the cap member 44 again. Then, the elastic pressing member 52 integrated with the rod member 51 is lowered, and the cam member 47 is rotated again by 90 ° via the ratchet wheel 46 and the rotating shaft 45, so that the movable shaft 33 follows the contour curve of the cam surface 47a. Thus, the cam member 46 shifts to a portion where the lift amount is small. As a result, the movable shaft 33 is pushed up by the elastic force of the first spring member 34, and the valve body 35 attached to the movable shaft 33 is separated from the valve seat 31 formed in the valve body 32, so that the valve mechanism is opened. Can be switched to. Therefore, as apparent from FIG. 3, the outside air introduced through the silencer 16 is supplied to the vacuum chamber 24, and the inside of the vacuum chamber 24 is in a normal pressure state.

  When the piston 2 is lifted using the crane C after the valve mechanism is switched to the open state, the rod member 51 is pushed up by the elastic force of the second spring member 53 as the pressing member 4 is lifted, but the valve mechanism is opened. Since the state is maintained, the conveyed product M is detached from the suction pad 6. That is, the valve device 11 and the valve switching unit 41 return to the state shown in FIG.

  Thus, since the vacuum lift device 100 according to the present embodiment has the valve device 11 arranged outside the cylinder 1, the structure of the vacuum lift device is simplified compared to the case where the valve device 11 is incorporated inside the cylinder 1. This can facilitate the manufacture and maintenance of the vacuum lift device. Moreover, since the vacuum lift apparatus 100 which concerns on this embodiment performs switching operation of the valve mechanism with which the valve apparatus 11 was equipped using the press member 4 which operate | moves integrally with piston 2, it responds to the up-and-down movement of piston 2. The switching operation of the valve mechanism provided in the valve device 11 can be performed without power. Furthermore, the vacuum lift device 100 according to the present embodiment does not require a sheet gasket when generating a vacuum state, and thus has excellent durability.

  Further, the vacuum lift device 100 according to the present embodiment rotationally drives the rotating shaft 45 of the valve switching unit 41 in one direction using the pressing member 4 provided on the piston rod 2a, and thereby the valve mechanism of the valve device 11 is driven. Therefore, the valve switching unit 41 may be provided with a simple power conversion unit that converts the pressing force of the pressing member 4 into the rotational motion of the rotating shaft 45, and the configuration of the valve switching unit 41 can be simplified.

  Furthermore, the vacuum lift device 100 according to the present embodiment includes a gap adjusting member 12 between the rod member 51 and the pressing member 4 provided in the valve switching unit 41 for adjusting the gap between these two members. Therefore, it is possible to appropriately adjust the opening / closing timing of the valve mechanism, and the suction or detachment of the conveyed product M by the suction pad 6 can be performed smoothly.

  In the above-described embodiment, the suction pad 6 is directly attached to the cylinder 1. However, instead of such a configuration, the cylinder 1 and the suction pad 6 may be separated and attached to required positions. . For example, in the example of FIG. 10, the cylinder 1 is fixed to the center of the upper surface of the frame 71, and a plurality (two in the example of FIG. 10) of suction pads 6 are fixed to the lower surface of the frame 71. The chamber and each suction pad 6 are connected by a piping hose 72. In FIG. 10, reference numeral 73 denotes a handrail used when the frame 71 is manually moved, and reference numeral 74 denotes a pressure gauge that displays the atmospheric pressure in the cylinder 1. Since other configurations are the same as those in the above-described embodiment, the same reference numerals are given to corresponding portions, and descriptions thereof are omitted. Also with this configuration, the same effects as the vacuum lift device 100 according to the embodiment can be obtained.

  In the above embodiment, the reverse rotation preventing member 39 is attached to the upper surface of the valve device 11, but it can also be attached to other parts such as the inner surface of the main cylindrical portion 42 constituting the valve switching unit 41.

  INDUSTRIAL APPLICABILITY The present invention can be used for a vacuum lift device used for vacuum suction and conveyance of heavy steel plates and glass plates.

  DESCRIPTION OF SYMBOLS 1 ... Cylinder, 2 ... Piston, 2a ... Piston rod, 3 ... Hanging hook, 4 ... Pressing member, 6 ... Adsorption pad, 11 ... Valve apparatus, 12 ... Space | interval adjustment member, 21 ... Substrate, 23 ... Elastic adsorption part, 24 ... Vacuum chamber, 31 ... Valve seat, 32 ... Valve body, 33 ... Movable shaft, 34 ... First spring member, 35 ... Valve body, 36, 37 ... Air flow hole, 41 ... Valve switching unit, 42 ... Main cylinder 44: Cap member, 45 ... Rotating shaft, 46 ... Claw wheel, 47 ... Cam member, 47a ... Cam surface, 51 ... Rod member, 52 ... Elastic pressing member, 53 ... Second spring member, 54 ... Claw wheel drive 55, stopper member, 61 ... collar, 62 ... mounting hole for interval adjusting member, 65 ... retaining pin, 71 ... frame, 72 ... piping hose, 73 ... handrail, 74 ... pressure gauge, 100 ... vacuum lift Equipment, C ... Crane, M ... Conveyed goods

Claims (7)

A cylinder, a piston disposed in the cylinder, a suction pad that is in close contact with the surface of the conveyed object, and that adsorbs the conveyed object and detaches the adsorbed conveyed object according to driving of the piston; A valve device that allows or blocks the introduction of outside air into the vacuum chamber formed by the inner surface of the product and the surface of the conveyed product, and automatically opens and closes the valve device each time the piston is lifted or lowered. In a non-powered vacuum lift device comprising a valve switching unit that alternately switches the atmospheric pressure in the vacuum chamber to a vacuum state or a normal pressure state,
The valve device and the valve switching unit are arranged outside the cylinder, and are operated integrally with the piston, and the upper part projects from the upper surface of the cylinder to the outside to operate the valve switching unit. Providing a pressing member,
The pressing member rotates the rotation shaft provided in the valve switching unit in one direction each time the piston is suspended and moves the valve mechanism of the valve device from an open state to a closed state, or A vacuum lift device characterized by alternately switching from a closed state to an open state. The valve device includes a valve body in which a valve seat is formed, a movable shaft that is slidably attached to the valve body, and a valve body that is provided on the movable shaft and constitutes a valve mechanism in combination with the valve seat. And a first spring member that urges the valve body in a direction separating the valve body from the valve seat,
The valve switching unit includes a rotating shaft rotatably attached to a casing, a claw wheel and a cam member fixed to the rotating shaft, and a pressing force of the pressing member every time the pressing member is lowered. And a pinion wheel drive member that intermittently drives the rotary shaft to rotate, and the tip of the movable shaft biased by the first spring member is brought into elastic contact with the cam surface of the cam member. The vacuum lift device according to claim 1.   The vacuum lift device according to claim 2, wherein a spherical body in contact with a cam surface of the cam member is rotatably provided at a distal end of the movable shaft.   The claw wheel drive member has a rod member slidably attached to the casing and one end attached to the rod member, and when the rod member is pushed down by the pressing member, the claw wheel is specified. The vacuum lift device according to any one of claims 2 and 3, comprising an elastic pressing member that presses in one direction.   The vacuum lift device according to claim 4, wherein the rod member is provided with an interval adjusting member for adjusting an interval between the rod member and the pressing member.   A rotation preventing member that allows rotation of the claw wheel by the claw wheel driving member and prevents rotation of the claw wheel in a direction opposite to a rotation direction of the claw wheel by the claw wheel driving member; The vacuum lift device according to any one of claims 2 to 5, wherein the vacuum switch device is provided in the valve switching unit.   The vacuum lift device according to claim 6, wherein the reverse rotation preventing member is formed of an elastic plate.