JP2015037991A - Workpiece hanging jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a workpiece hanging jig capable of easily and reliably lifting, for example, a cylindrical workpiece by a simple configuration.SOLUTION: A workpiece hanging jig 1A is used for lifting a workpiece 2 which has opposed wall surface parts 3a and 3b facing each other in a horizontal direction and which is opened upward. The workpiece hanging jig 1A comprises an abutting member 4A, in which a distance between both ends is longer than a distance between the opposed wall surface parts 3a and 3b, the one end of which is positioned lower than the other end, and which is vertically inclined by a predetermined angle so that both of the ends can be concurrently brought into contact with the opposed wall surface parts 3a and 3b. A hanging hole 7, on which a lifting force acts, is provided on the side of one end with respect to the approximate center of the abutting member 4A.

Description

  The present invention relates to a workpiece suspension jig that is suitable for use in lifting a cylindrical workpiece, for example.

  Conventionally, for example, as a method of lifting a cylindrical workpiece, a method of attracting and lifting the upper end surface of a workpiece using a magnet lifting tool that uses the magnet's attractive force, or laying a laying board on the bottom of the work and laying the laying board from the outside There is a method of lifting a workpiece by lifting it.

  However, in the case of using the above-described magnet hanging tool, there is a possibility that the workpiece may drop due to a deficiency such as insufficient magnet attracting force, which is problematic in terms of safety. On the other hand, in the case of using a base plate, there is a problem that it is very difficult, cumbersome and inefficient to lay the base plate under the work.

  What can solve these problems is proposed in Patent Document 1, for example.

Japanese Utility Model Publication No. 5-10384

What is proposed in this Patent Document 1 is a hanging jig for hanging a pipe in contact with the inner surface of a pipe, and a guide wire rope having a grip portion at the upper end and a stopper at the lower end. I have.
A cylindrical upper holder and a lower holder are mounted on the guide wire rope so as to be movable along the guide rope. A plurality of locations between the upper holder and the lower holder are connected by two arms that are flexibly connected outward. A pressing member is attached to the bent portion of these two arms via a bent portion holder.
In this hanging jig, the guide wire rope to be inserted into the pipe is lifted by the gripping part and the two arms at a plurality of locations are bent outward by its own weight, so that the pressing part mounted on the bending part holding tool The member can be pressed against the inner surface of the tube to suspend the tube.

  However, in the above-described hanging jig, a mechanism for pressing the pressing member against the inner surface of the pipe, that is, a link mechanism including an upper holder, a lower holder, two arms, a bent part holder, and the like is necessary. There is a problem that the configuration becomes complicated.

  The present invention has been made in view of the above-described problems. For example, an object of the present invention is to provide a workpiece hanging jig that can easily and reliably lift a cylindrical workpiece with a simple configuration. is there.

In order to achieve the above object, the workpiece hanging jig according to the present invention is:
A workpiece hanging jig used when lifting a workpiece having an opposite wall surface portion facing in the horizontal direction and opened upward,
Provided is a contact member that has a distance between both ends that is longer than a distance between the opposing wall surfaces and that is inclined at a predetermined angle in the vertical direction with one end being lower than the other end, so that both ends can simultaneously contact the opposing wall surfaces. Further, a hanging portion for applying a lifting force is provided on one end side from the substantially center of the contact member (first invention).

  In the present invention, it is preferable that the distance between both ends of the contact member is adjustable (second invention).

  In the present invention, it is preferable to provide positioning means for positioning so that the contact member is disposed above the center of gravity of the workpiece (third invention).

In the workpiece hanging jig of the present invention, the abutting member having a distance between both ends longer than the distance between the opposing wall surface portions between the opposing wall surface portions of the workpiece is inclined at a predetermined angle in the vertical direction. Are arranged in contact with the opposing wall surface at the same time. At this time, one end of the abutting member is positioned lower than the other end so that one end is in contact with the wall surface on one side of the opposing wall surface and the other end is in contact with the wall surface on the other side of the opposing wall surface. Made to contact.
In such a state, in the hanging portion provided at one end side from the substantially center of the contact member, that is, in the contact member, a predetermined distance from the portion corresponding to the center position between the opposing wall surface portions toward the one end side. A lifting force is applied to the hanging portion provided at the position. Then, one end side of the abutting member tries to rotate upward around the contact position between the other end of the abutting member and the other wall surface portion, but the distance between both ends of the abutting member is between the opposing wall surface portions. Since it is longer than the distance, it cannot rotate, and both ends of the contact member are strongly pressed against the opposing wall surface portion by the action of the lifting force.
Thus, the lifting force can be reliably applied to the workpiece via the contact member pressed against the opposing wall surface portion of the workpiece.

  According to the workpiece hanging jig of the present invention, no special mechanism is required to press both ends of the abutting member against the opposing wall surface portion of the workpiece, and the distance between both ends is made longer than the distance between the opposing wall surface portions. Both ends of the contact member can be pressed against the opposing wall surface portion of the workpiece by a simple operation as described above. Therefore, for example, a cylindrical workpiece having an inner peripheral wall surface in which the opposing wall surface portions are continuous in the circumferential direction, a square cylindrical workpiece having two sets of opposing wall surface portions, a pair of opposing surfaces in a U-shaped cross section. A U-shaped grooved workpiece having a wall surface can be easily and reliably lifted with a simple configuration.

  Moreover, according to the workpiece | work suspension jig | tool of 2nd invention, since the distance between the both ends of a contact member can be adjusted, it can apply to the multiple types of workpiece | work from which the magnitude | size of opening differs.

  Further, according to the work lifting jig of the third invention, the positioning means for positioning the contact member so as to be disposed above the center of gravity of the work is provided, so that the work can be reliably lifted. Can do.

It is a setting state figure to the work of the work hanging jig concerning a 1st embodiment of the present invention. It is a setting state figure to the work of the work hanging jig concerning a 2nd embodiment of the present invention. (A) is a longitudinal cross-sectional view of the workpiece | work hanging jig | tool which concerns on 2nd Embodiment, (b) is a cross-sectional view of the said workpiece | work hanging jig | tool. It is a setting state figure to the work of the work hanging jig concerning a 3rd embodiment of the present invention. It is the figure which represented the mechanical balance relationship at the time of workpiece | work lifting with the skeleton.

  Next, specific embodiments of the workpiece hanging jig according to the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 shows a setting state diagram of a workpiece hanging jig according to a first embodiment of the present invention on a workpiece.

<Overview of workpiece hanging jig>
As shown in FIG. 1, the workpiece hanging jig 1 </ b> A of the present embodiment is used when lifting a cylindrical workpiece 2 having a hollow portion 2 a.
Here, the workpiece 2 has an inner peripheral wall surface 3 in which opposing wall surface portions 3a and 3b facing inward in the radial direction are continuous in the circumferential direction, and the opening at both ends is previously set when the lifting operation is performed. It is placed on a floor (not shown) such as a work place in the vertical direction. In this mounting state, the opposed wall surface portions 3a and 3b are opposed in the horizontal direction.
The workpiece hanging jig 1A includes a contact member 4A disposed in the hollow portion 2a of the workpiece 2.

<Description of contact member>
The contact member 4A is inclined by a predetermined angle in the vertical direction with the distance between both ends being slightly longer than the distance between the opposing wall surface portions 3a and 3b (inner diameter dimension of the workpiece 2) and one end being lower than the other end. It is constituted by a square bar-like member made of metal (or may be made of engineering plastic) having a length dimension in which both ends are simultaneously in contact with the opposing wall surface portions 3a and 3b.
In the contact member 4A, when one end is inclined at a predetermined angle in the vertical direction with one end being lower than the other end, the one end surface 5 is in good contact with the wall surface portion 3a on one side of the opposing wall surface portions 3a, 3b. The upper half of the one end surface 5 is preferably a tapered surface 5a, and similarly, the lower half of the other end surface 6 is used in order to make the other end surface 6 come into good contact with the other wall surface 3b. Is preferably a tapered surface 6a.

A suspension hole 7 is provided on one end side of the contact member 4A from the substantially center. The suspension hole 7 is disposed at a predetermined distance from the portion corresponding to the center position between the opposing wall surface portions 3a and 3b in the contact member 4A toward one end side.
A shackle 9 connected to the tip (lower end) of the suspended wire rope 8 is attached to the suspension hole 7, and the suspension hole is lifted via the shackle 9 by winding the wire rope 8 with a crane (not shown). The lifting force can be applied to the peripheral surface of the outer wall 7.

<Description of positioning means>
Positioning means 10 for positioning the contact member 4A so that the contact member 4A is disposed above the center of gravity G of the workpiece 2 is attached.
The positioning means 10 includes an all-screw type bolt 11 having a relatively long neck length.
The bolt 11 is screwed to the other end portion of the contact member 4A so as to protrude from the upper surface, and is tightened with a nut 12 screwed to the screw shaft portion 11a in a seated state on the upper surface of the contact member 4A. It is fixed to the contact member 4A.
A contact plate 13 is attached to the screw shaft portion 11a of the bolt 11 so as to be movable along the screw shaft portion 11a, and a pair of nuts 14 are screwed so as to sandwich the contact plate 13 vertically. .

In the positioning means 10, if the interval between the pair of nuts 14 is widened by rotating one or the other or both of the pair of nuts 14, the contact plate 13 is attached to the screw shaft portion 11 a between the pair of nuts 14. It can be moved freely along. Further, if the abutting plate 13 is sandwiched between the pair of nuts 14 by rotating one or the other or both of the pair of nuts 14, the abutting plate 13 is fixed at the position sandwiched between the pair of nuts 14. Can do.
Thus, the relative position of the contact plate 13 with respect to the contact member 4A can be adjusted by a predetermined rotation operation of the pair of nuts 14 and the movement operation of the contact plate 13 with respect to the screw shaft portion 11a. When 4A is arranged at a predetermined height position above the center of gravity G of the work 2 in the hollow portion 2a of the work 2, the contact plate 13 is brought into contact with the upper end of the work 2 and the contact member 4A is placed on the center of gravity G of the work 2 It can position so that it may be located upwards.

<Description of work lifting operation>
The operation of lifting the workpiece 2 using the workpiece hanging jig 1A configured as described above will be described below.

First, in order to put the contact member 4A into the hollow portion 2a of the workpiece 2, the one end side provided with the suspension hole 7 is set at a position lower than the other end side, and the contact member 4A is inclined in the vertical direction. The contact member 4A is put into the hollow portion 2a of the work 2 while maintaining the inclined state, and the contact member 4A is lowered until the contact plate 13 hits the upper end of the work 2.
At this time, the position of the contact member 4 </ b> A in the vertical direction is positioned above the center of gravity G of the work 2 by the contact plate 13 in contact with the upper end of the work 2. The tapered surface 5a of the one end surface 5 is in contact with the one side wall surface portion 3a, and the tapered surface 6a of the other end surface 6 is in contact with the other wall surface portion 3b.
Next, when the wire rope 8 is wound up and a lifting force is applied to the peripheral surface of the suspension hole 7 of the contact member 4A, one end side of the contact member 4A becomes the other end surface 6 of the contact member 4A and the other wall surface portion 3b. The distance between both ends of the contact member 4A (the length dimension of the contact member 4A) is longer than the distance between the opposing wall surface portions 3a and 3b. However, both ends of the contact member 4A are strongly pressed against the opposing wall surface portions 3a and 3b simultaneously by the action of the lifting force.
Thus, the lifting force can be reliably applied to the workpiece 2 via the contact member 4A pressed against the opposing wall surface portions 3a and 3b of the workpiece 2.

<Description of effects>
According to the workpiece hanging jig 1A of the present embodiment, no special mechanism is required to press both ends of the contact member 4A against the opposing wall surface portions 3a and 3b of the workpiece 2, and the distance between the opposing wall surface portions 3a and 3b. In addition, the abutting member 4A having a longer distance between both ends can be pressed against the opposing wall surface portions 3a and 3b of the workpiece 2 by a simple operation as described above. Therefore, the workpiece 2 can be easily and reliably lifted with a simple configuration.
Further, since the positioning means 10 for positioning the contact member 4A so as to be disposed above the center of gravity G of the work 2 is provided, a stable lifting operation of the work 2 can be reliably performed.

[Second Embodiment]
FIG. 2 shows a setting state diagram of the workpiece hanging jig according to the second embodiment of the present invention on the workpiece. FIG. 3 shows a longitudinal sectional view (a) of the workpiece suspension jig according to the second embodiment and a transverse sectional view (b) of the workpiece suspension jig, respectively.
In the present embodiment, the same or similar parts as those in the first embodiment will be denoted by the same reference numerals in the drawing, and detailed description thereof will be omitted. The description will focus on the part (the same applies to the third embodiment described later).

  In the workpiece hanging jig 1A of the first embodiment described above, the contact member 4A does not have a length adjusting function for adjusting the distance between both ends, and is used as it is. On the other hand, in the workpiece suspension jig 1B of the present embodiment, a contact member 4B having a length adjusting function for adjusting the distance between both ends is employed.

<Description of contact member>
As shown in FIG. 2, the contact member 4 </ b> B is configured by attaching contact pins 21 and 22 to both ends of the contact member main body 20 constituting the main body portion. Here, each of the contact pins 21 and 22 is formed by concentrically providing a screw shaft portion 24 concentrically with a cylindrical head portion 23 having a partial spherical surface 23a at the tip. In addition, since each contact pin 21 and 22 is a member which contacts the workpiece | work 2 directly, it is good to comprise by metal materials, such as high hardness alloy tool steel, and to suppress wear.

The contact member main body 20 includes a first body 20a disposed on one end side, a second body 20b disposed on the other end side, and a spacer disposed between the first body 20a and the second body 20b. 20c. The first body 20a, the second body 20b, and the spacer 20c are integrally coupled by a bolt 20d (see FIG. 3A).
Here, a latch member 25 having a suspension hole 7 is fixed to the first body 20a. The suspension hole 7 in the hooking member 25 is disposed at a predetermined distance from the portion corresponding to the center position between the opposing wall surface portions 3a and 3b in the contact member 4B toward one end side. A shackle 9 connected to the tip (lower end) of the hanging wire rope 8 is attached to the suspension hole 7 of the latching member 25. The shackle 9 is wound up by winding the wire rope 8 with a crane or the like (not shown). A lifting force can be applied to the peripheral surface of the suspension hole 7 via the.
The second body 20b is provided with the same member as the positioning means 10 described in the first embodiment.

  As shown in FIG. 3A, the first body 20a has a female screw portion 26 corresponding to the screw shaft portion 24 of the contact pin 21, and the screw shaft portion 24 is screwed into the female screw portion 26 and tightened. As a result, the contact pin 21 is fixed to the first body 20a.

The second body 20b includes a first hollow portion 27, a second hollow portion 28, and a third hollow portion 29 that are sequentially arranged from one end side to the other end side along the axis Ox.
A worm wheel 31 is attached to the first hollow portion 27 via a bush 30 so as to be rotatable about the axis Ox. A slider 33 is incorporated in the third hollow portion 29 via a bush 32 so as to be linearly movable in the direction of the axis Ox.

The slider 33 has a female screw portion 34 corresponding to the screw shaft portion 24 of the contact pin 22, and the contact pin 22 is fixed to the slider 33 by screwing and tightening the screw shaft portion 24 to the female screw portion 34. It has become so.
The slider 33 has a female screw portion 36 corresponding to a screw shaft 35 extending so as to be screwed into the worm wheel 31 through the second hollow portion 28 in the axis Ox direction. The screw shaft 35 is fixed to the slider 33 by screwing and tightening the nut 37 attached to the screw shaft 35 so as to press against the slider 33.
A groove 38 is provided on the outer peripheral surface of the slider 33 along the direction of the axis Ox, and a pin insertion hole 39 is provided in the second body 20 b so as to correspond to the groove 38. Is inserted into the groove 38 to prevent the slider 33 from rotating about the axis Ox.

As shown in FIG. 3B, the spacer 20c has a worm shaft 41 extending along the axis Oy that is shifted by 90 ° from the axis Ox at a position separated by a predetermined distance from the axis Ox via the bush 42. It is supported so that it can rotate freely. A worm 43 that meshes with the worm wheel 31 is fixed to the worm shaft 41.
Then, when the knob 45 provided at one end of the worm shaft 41 is picked and the worm shaft 41 is rotated, the worm wheel 31 is rotated via the worm 43, and the screw shaft 35 is rotated along the axis Ox by the rotation of the worm wheel 31. The slider 33 is linearly moved in the direction of the axis Ox. Thus, the distance between the tip of the contact pin 21 on one end side and the tip of the contact pin 22 on the other end side, that is, the distance between both ends of the contact member 4B (the length dimension of the contact member 4B) can be adjusted. .
3B is used to fix the relative position around the axis Ox between the first body 20a and the spacer 20c after adjusting the gap between the worm 43 and the worm wheel 31. Dowel pin. The dowel pin 44 is depicted only in FIG. 3B for convenience of explanation, and is not shown in FIG.

<Description of work lifting operation>
The operation of lifting the workpiece 2 using the workpiece hanging jig 1B configured as described above will be described below.

First, by picking the knob 45 and rotating the worm shaft 41, the distance between both ends of the contact member 4B (the length dimension of the contact member 4B), that is, the tip end and the other end side of the contact pin 21 on one end side. The distance from the tip of the contact pin 22 is made slightly longer than the inner diameter dimension of the workpiece 2.
Thereafter, as shown in FIG. 2, in order to put the contact member 4B into the hollow portion 2a of the workpiece 2, the contact member 4B is set at a position lower than the other end side on one end side where the suspension hole 7 is provided. The contact member 4B is placed in the hollow portion 2a of the workpiece 2 while maintaining the tilted state, and the contact member 4B is lowered until the contact plate 13 hits the upper end of the workpiece 2.
At this time, the position of the contact member 4 </ b> B in the vertical direction is positioned above the center of gravity G of the work 2 by the contact plate 13 in contact with the upper end of the work 2. Further, the partial spherical surface 23a at the tip of the contact pin 21 on one end side is brought into contact with the wall surface portion 3a on one side, and the partial spherical surface 23a at the tip of the contact pin 22 on the other end side is in contact with the wall surface on the other side. It is made to contact the part 3b.
Next, when the wire rope 8 is wound up and a lifting force is applied to the peripheral surface of the suspension hole 7 of the contact member 4B, the contact pin 21 on one end side of the contact member 4B becomes a partial spherical shape of the contact pin 22 on the other end side. Although it tries to rotate upward around the contact position between the surface 23a and the wall surface portion 3b on the other side, the distance between both ends of the contact member 4B is longer than the distance between the opposed wall surface portions 3a and 3b, so that it rotates. The contact pins 21 and 22 of the contact member 4B are strongly pressed against the opposing wall surface portions 3a and 3b simultaneously by the action of the lifting force.
Thus, the lifting force can be reliably applied to the workpiece 2 via the contact member 4B pressed against the opposing wall surface portions 3a and 3b of the workpiece 2.

<Description of effects>
According to the workpiece hanging jig 1B of the present embodiment, the same effect as that of the workpiece hanging jig 1A of the first embodiment can be obtained, and the distance between both ends of the contact member 4B is as follows. Since it can be adjusted, it can be applied to a plurality of types of workpieces 2 having different opening sizes.

[Third Embodiment]
FIG. 4 shows a setting state diagram of the workpiece hanging jig according to the third embodiment of the present invention on the workpiece.

  In the workpiece suspension jig 1B of the second embodiment described above, the contact member 4B adjusts the distance between both ends by a worm gear method by rotating the knob 45. In the tool 1C, such an adjustment function is achieved with a simpler configuration.

<Description of contact member>
In the workpiece suspension jig 1C of the present embodiment, the contact member 4C includes a contact member body 50 made of a rectangular parallelepiped block-shaped member constituting the body portion, and the length is adjusted at both ends of the contact member body 50. Bolts 51 and 52 are mounted. Here, each of the length adjusting bolts 51 and 52 is configured such that a screw shaft portion 54 is concentrically provided integrally with a bolt head 53 having a partial spherical surface 53a at the tip.
In the contact member 4C, the screw shaft portions 54 of the length adjusting bolts 51 and 52 are screwed into both ends of the contact member main body 50, and the nut 55 attached to the screw shaft portion 54 is attached to the contact member main body 50. The length adjusting bolts 51 and 52 are fixed to the abutting member main body 50 by being tightened so as to be pressed against the end face of 50.

A latching member 56 having a suspension hole 7 is fixed to the upper surface of one end of the contact member main body 50. The suspension hole 7 in the hooking member 56 is disposed at a predetermined distance from the portion corresponding to the center position between the opposing wall surface portions 3a and 3b in the contact member 4C toward one end side.
A shackle 9 connected to the tip (lower end) of the hanging wire rope 8 is attached to the suspension hole 7 of the hooking member 56. The shackle 9 is wound up by winding the wire rope 8 with a crane or the like (not shown). A lifting force can be applied to the peripheral surface of the suspension hole 7 via the.
The other end of the contact member main body 50 is attached with the same one as the positioning means 10 described in the first embodiment.

<Description of work lifting operation>
The operation of lifting the workpiece 2 using the workpiece hanging jig 1C configured as described above will be described below.

First, after the nut 55 is loosened, the length adjusting bolts 51 and 52 are rotated to adjust the distance between both ends of the contact member 4C (the length dimension of the contact member 4C), that is, the length on one end side. The distance between the tip of the bolt 51 and the tip of the other length-adjusting bolt 52 is made slightly longer than the inner diameter of the workpiece 2. If the length of the length adjusting bolts 51 and 52 with respect to the contact member 4C is determined, the nut 55 is tightened so as to be pressed against the end surface of the contact member main body 50, and the length adjusting bolt is fixed to the contact member main body 50. 51 and 52 are fixed.
Thereafter, in order to put the contact member 4C into the hollow portion 2a of the workpiece 2, the contact member 4C is inclined in the vertical direction with the one end side provided with the suspension hole 7 being positioned lower than the other end side, The contact member 4C is put into the hollow portion 2a of the work 2 while maintaining the inclined state, and the contact member 4C is lowered until the contact plate 13 hits the upper end of the work 2.
At this time, the position of the contact member 4 </ b> C in the vertical direction is positioned above the center of gravity G of the work 2 by the contact plate 13 in contact with the upper end of the work 2. Also, the partial spherical surface 53a at the tip of the length adjusting bolt 51 on one end side is brought into contact with the wall surface portion 3a on the one side, and the partial spherical surface at the tip of the length adjusting bolt 52 on the other end side. 53a is brought into contact with the wall surface 3b on the other side.
Next, when the wire rope 8 is wound up and a lifting force is applied to the peripheral surface of the suspension hole 7 of the contact member 4C, the length adjusting bolt 51 on one end side of the contact member 4C is adjusted in length on the other end side. An attempt is made to rotate upward around the contact position between the partial spherical surface 53a of the bolt 52 and the wall surface portion 3b on the other side, but the distance between both ends of the contact member 4C is greater than the distance between the opposed wall surface portions 3a and 3b. Since it is too long, it cannot be rotated, and both length adjusting bolts 51 and 52 of the abutting member 4C are strongly pressed against the opposing wall surface portions 3a and 3b simultaneously by the action of the lifting force.
Thus, the lifting force can be reliably applied to the workpiece 2 via the contact member 4C pressed against the opposing wall surface portions 3a and 3b of the workpiece 2.

<Description of effects>
According to the workpiece suspension jig 1C of the present embodiment, the same effects as those of the workpiece suspension jig 1B of the second embodiment can be obtained with a simpler configuration.

  As mentioned above, although the workpiece | work hanging jig | tool of this invention was demonstrated based on several embodiment, this invention is not limited to the structure described in the said embodiment, The structure described in each embodiment is combined suitably. The configuration can be changed as appropriate without departing from the spirit of the invention.

  For example, in the above-described embodiment, an example in which the cylindrical workpiece 2 is lifted using the workpiece hanging jigs 1A, 1B, and 1C has been described. However, the present invention is not limited to this example. The present invention can also be applied to lifting a rectangular cylindrical workpiece having a U-shaped groove or a U-shaped workpiece having a pair of opposing wall surfaces with a U-shaped cross section. In other words, a workpiece that has an opposing wall surface portion facing in the horizontal direction and is opened upward can be lifted using the workpiece lifting jigs 1A, 1B, and 1C regardless of the shape.

  Next, specific examples of the workpiece hanging jig according to the present invention will be described with reference to the drawings.

  First, as shown in FIG. 5, the mechanical force when lifting a cylindrical steel workpiece 2 having an inner diameter of 172 mm, an outer diameter of 320 mm, a height of 313 mm, and a weight of 140 kgf using the workpiece lifting jigs 1A, 1B, 1C. This will be described below using the skeletons of the abutting members 4A, 4B, and 4C depicted in FIG. In the following, the contact members 4A, 4B, and 4C are collectively referred to as the contact member 4.

Each symbol used in FIG. 5 is defined as follows.
A: Contact position between one end of the contact member 4 and the wall surface portion 3a on one side B: Contact position between the other end of the contact member 4 and the wall surface portion 3b on the other side C: Action point of the lifting force (hanging hole 7) Position of)
F: Lifting force L: Distance between opposing wall surface portions 3a and 3b (inner diameter of workpiece)
L ₁ : Distance between the wall surface portion 3a on one side and the application point (C) of the lifting force L ₂ : Distance between the wall surface portion 3b on the other side and the application point (C) of the lifting force P ₁ : Wall surface portion on one side normal force from 3a P _2: the normal force from the other side of the wall portion 3b R _1: frictional force between the one end and the one side wall surface portion 3a of the contact member 4 R _2: the other end of the contact member 4 Friction force between the wall surface 3b on the other side and the other side wall W: the weight of the contact member 4 θ: the inclination of the contact member 4 in the vertical direction Note that the weight of the workpiece 2 is large due to the influence of the weight W of the contact member 4. Since the smaller the larger, the smaller the weight, so that the heavy weight 2 is lifted, and the weight W will be ignored in the following.

From the force relationship acting on the contact member 4, the following expressions (1) to (4) are established.
P ₁ = P ₂ (1)
R ₁ + R ₂ = F (2)
R ₁ = μ · P ₁ (3)
R ₂ = μ · P ₂ (4)
Here, μ is a coefficient of static friction.
From the above equations (1) to (4), the following equations (5) to (8) are established.
μ · (P ₁ + P ₂ ) = F (5)
P ₂ = F / 2μ (6)
R ₂ = F / 2 (7)
R ₁ = R ₂ (8)

The clockwise moment Mcw at the point A can be expressed by the following equation (9).
Mcw = R ₂ · L = (F / 2) · L (9)
The counterclockwise moment Mccw of point A can be expressed by the following equation (10).
Mccw = F · L ₁ + P ₂ · L · tan θ
= F · L ₁ + (F / 2μ) · L · tan θ (10)

Since Mcw = Mccw, the following equation (11) is established.
L-2L ₁ = (L / μ) · tan θ (11)
From the above equation (11), μ can be expressed by the following equation (12).
μ = {L / (L−2L ₁ )} · tan θ (12)
That is, if μ satisfies the relationship of the following equation (13), the contact member 4 does not slide upward.
μ> {L / (L-2L ₁ )} · tan θ (13)

Next, the vertical inclination θ of the contact member 4 will be examined.
The above equation (13) is transformed into the following equation (14).
tan θ <{μ · (L−2L ₁ )} / L (14)
Here, for example, if L ₁ = 44 mm and μ = 0.2, θ <5.6 °.
When the material of the workpiece 2 or the contact member 4 is steel, μ is usually about 0.2. However, in consideration of safety, when μ = 0.1, θ <2.8 °. .

When F = 140 kgf (1372 N), L ₁ = 44 mm, L ₂ = 128 mm, and θ = 3 °, the relationship between μ and P ₁ , P ₂ , R ₁ , R ₂ is as shown in Table 1, and μ Table 2 shows the allowable inclination angle θ ′ due to the influence of the position of the suspension hole 7 on the surface.

  As is clear from Table 2, if the position of the suspension hole 7 in the abutting member 4 is away from the portion corresponding to the center position between the opposing wall surface portions 3a and 3b toward one end side, the allowable inclination angle θ 'Becomes larger. It is preferable that the workpiece 2 has a variation in inner diameter and the allowable inclination angle θ ′ is as large as possible. The position of the suspension hole 7 is determined from the portion corresponding to the center position between the opposing wall surface portions 3a and 3b. It is good to provide at a position as far as possible toward one end side.

For example, when the workpiece 2 is lifted using the workpiece suspension jig 1B according to the second embodiment, the length S of the contact member 4B is δ = S− with respect to the inner diameter L (172 mm) of the workpiece 2. It is necessary to lengthen by L. At this time, when the workpiece 2 is a steel material, it is necessary to satisfy θ = cos ⁻¹ (L / S) ≦ 3 ° from the viewpoint of safety.
In this case, the adjustment amount δ is about 0.3 mm, and the knob 45 may be rotated by an amount corresponding to the adjustment amount δ.

  Since the workpiece hanging jig of the present invention has a characteristic that it can easily and reliably lift a workpiece having an opposed wall surface portion facing in the horizontal direction and opened upward with a simple configuration, For example, it can be suitably used for lifting a cylindrical workpiece having an inner peripheral wall surface in which the opposing wall surface portion is continuous in the circumferential direction. For example, a rectangular cylindrical workpiece having two sets of opposite wall surface portions. It can also be used for lifting applications such as a U-shaped groove-shaped workpiece having a U-shaped cross section and a pair of opposing wall surfaces.

1A, 1B, 1C Work hanging jig 2 Work 3a, 3b Opposing wall surface 4A, 4B, 4C Abutting member 7 Hanging hole (hanging part)
10 Positioning means

Claims (3)

A workpiece hanging jig used when lifting a workpiece having an opposite wall surface portion facing in the horizontal direction and opened upward,
Provided is a contact member that has a distance between both ends that is longer than a distance between the opposing wall surfaces and that is inclined at a predetermined angle in the vertical direction with one end being lower than the other end, so that both ends can simultaneously contact the opposing wall surfaces. A work hanging jig characterized in that a hanging portion for applying a lifting force is provided on one end side of the abutting member from the substantially center.   The workpiece suspension jig according to claim 1, wherein a distance between both ends of the contact member is adjustable. The workpiece hanging jig according to claim 1, wherein positioning means is provided for positioning so that the contact member is disposed above the center of gravity of the workpiece.