JP6801836B1 - Projection nut supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem of minute bending or bending of a supply rod when the entire sliding rod is composed of a piston rod itself, and to secure a smooth advancing / retreating operation of the supply rod. SOLUTION: An air cylinder 5 is joined to a guide pipe 19 via a joining member 9, and a stopper member 32 is arranged at a place where the guide pipe 19 and a supply pipe 28 of a nut 1 are joined to temporarily hold a nut 1. A sliding rod 12 in which a stop chamber 33 is formed and the piston rod itself is lengthened, and a guide rod 13 having a diameter smaller than that of the sliding rod 12 and entering the screw hole 3 are integrally formed, and are temporarily fixed. The relative positions of the temporary fixing chamber 33 and the supply rod 8 are set so that the screw hole 3 of the nut 1 stopped in the chamber 33 and the supply rod 8 are coaxial with each other, and between the sliding rod 12 and the guide pipe 19. A gap 21 is formed in the guide tube 19 and a support hole 41 having a diameter smaller than the inner diameter of the guide tube 19 is formed at the end of the guide tube 19 on the temporary fixing chamber 33 side. When the supply rod 8 is retracted, the sliding rod 12 is formed. Is supported with a slight sliding gap C1 left in the support hole 41. [Selection diagram] Fig. 1

Description

The present invention relates to a projection nut supply device that supplies a projection nut temporarily locked in a temporary fixing chamber to a target location of supply, for example, an electrode for electric resistance welding, with a supply rod that advances and retreats with an air cylinder.

According to Japanese Patent Application Laid-Open No. 2008-173649, the feed rod is advanced by penetrating the advancing / retreating supply rod operated by the air cylinder into the screw hole of the projection nut temporarily locked in the temporary fixing chamber in a skewered manner. , It is described that the projection nut that slides down the supply rod is fitted to the guide pin of the fixed electrode.

In the following description and claims, the projection nut may be simply referred to as a nut.

Japanese Unexamined Patent Publication No. 2008-173649

The supply rod described in the above patent document is a type in which the piston rod of the air cylinder is extended as it is, and the piston rod slides over the entire inner surface of the guide pipe joined to the air cylinder. ..

The length of the piston rod varies depending on the nut supply destination. For example, when manufacturing a long piston rod having a length of 500 mm and a diameter of 10 mm, it is necessary to manufacture the piston rod straight over the entire rod. In order to satisfy such requirements, it is necessary to raise the processing accuracy at the time of manufacturing to a remarkably high level. Further, if a slight curvature or bending remains in the rod due to residual stress or the like, smooth sliding to the inner surface of the guide pipe cannot be achieved, and frictional resistance becomes excessive. Therefore, an excessive load is applied to the air cylinder, the advancing / retreating speed of the rod is also lowered, and the productivity is lowered.

An object of the present invention is to solve the problem of minute bending or bending of the supply rod, which occurs when the entire sliding rod is composed of the piston rod itself, and to secure a smooth advancing / retreating operation of the supply rod. To do.

The invention according to claim 1
An air cylinder in which the piston and the piston rod are integrally moved back and forth in the cylinder is joined to a hollow guide pipe via a joining member arranged at the end of the air cylinder.
The piston rod is passed through a sliding hole provided in the joining member, and the piston rod is supported by the piston and the joining member in a state where it can move forward and backward.
A stopper member having a stopper surface is arranged at a position where the guide pipe and the supply pipe for feeding the nut are connected to form a temporary fixing chamber for the nut.
The supply rod is integrally formed with a sliding rod in which the piston rod itself is elongated and a guide rod having a diameter smaller than that of the sliding rod and entering the screw hole of the projection nut, and the sliding rod is minute. It has a curve or bend,
The relative position of the temporary fixing chamber and the supply rod is set so that the screw hole of the projection nut received by the stopper surface and stopped in the temporary fixing chamber is coaxial with the supply rod.
A gap is formed between the sliding rod and the guide pipe, and a support hole having a diameter smaller than the inner diameter of the guide pipe is formed at the end of the guide pipe on the temporary fixing chamber side.
The length of the gap between the sliding rod and the guide pipe as viewed in the length direction of the sliding rod is the end of the guide pipe on the temporary fixing chamber side where the support hole is not formed. Since it is formed on the member of the portion, it is set longer than the length of the support hole.
In a state where the supply rod is retracted, the sliding rod is supported with a slight sliding gap left in the support hole.
The sliding gap has a size that can absorb the amount of displacement of the outer peripheral surface of the sliding rod due to bending or bending.
The upper end of the supply rod is slidable with respect to the cylinder via the piston, and the intermediate portion is slidably supported by the sliding holes of the joining member, and the lower end is slidable. Is supported at three locations of the support holes formed at the end of the guide pipe on the temporary fixing chamber side.
The projection nut is characterized in that the sliding gap between the sliding rod and the support hole is set to be smaller than the gap between the guide rod and the screw hole that has entered the screw hole of the projection nut. It is a supply device of.

According to the first aspect of the present invention, an air cylinder in which a piston and a piston rod are integrally moved in and out of the cylinder is joined to a hollow guide pipe via a joining member, and a guide pipe and a nut are supplied. A stopper member having a stopper surface is arranged at the place where the pipes are connected to form a temporary fixing chamber for the nut, and the supply rod is composed of a sliding rod in which the piston rod itself is elongated and a sliding rod. A guide rod with a small diameter that enters the screw hole of the nut is integrally formed, and the screw hole of the nut that penetrates the sliding hole of the joining member and stops in the temporary fixing chamber, The relative positions of the temporary fixing chamber and the supply rod are set so that the supply rods are coaxial, a gap is formed between the sliding rod and the guide pipe, and a guide is provided at the end of the guide pipe on the temporary fixing chamber side. When a support hole having a diameter smaller than the inner diameter of the pipe is formed and the supply rod is retracted, a slight sliding gap is set between the sliding rod and the support hole.

When the supply rod is retracted, the upper end of the sliding rod is slid to the inner surface of the cylinder via the piston, and the lower end of the cylinder is slidable through the sliding hole of the joining member. It is supported in a state, and a gap is formed between the sliding rod and the guide pipe, and a support hole having a diameter smaller than the inner diameter of the guide pipe is formed at the end of the guide pipe on the temporary fixing chamber side and supplied. When the rod is retracted, the sliding rod is supported with a slight sliding gap left in the support hole.

As described above, when looking at the total length of the supply rod, the upper end is slidable via the piston, the intermediate part is supported in a slidable state by the sliding holes of the joining member, and the lower end is temporarily fixed. It is supported by a support hole formed at the end of the guide tube on the chamber side. In other words, the long supply rod is supported in a bearing shape at three places, a piston part, a joining member part, and a support hole part at the end of the guide pipe, and the other parts are surrounded by a space.

Since a gap is formed between the sliding rod and the guide tube, even if a slight curvature or bending remains in the supply rod, the sliding rod does not rub against the inner surface of the guide tube, and frictional resistance Does not matter, and smooth advance / retreat operation can be obtained.

Further, since a slight sliding gap is provided between the sliding rod and the support hole, the rubbing section between the sliding rod and the support hole has a slight length even if the supply rod is curved or bent. Therefore, the problem of rubbing resistance becomes mild.

The sliding gap between the sliding rod and the support hole is set to be smaller than the gap between the guide rod and the screw hole that has entered the screw hole of the projection nut .

The sliding rod is supported with a slight sliding gap left in the support hole, and the sliding gap between the sliding rod and the support hole is the gap between the guide rod and the screw hole that has entered the screw hole. Is set smaller than. Therefore, even if the sliding rod is rubbed against one side of the inner surface of the support hole, the tip of the guide rod does not deviate from the opening circle of the screw hole, and the guide rod is normally inserted into the screw hole when the supply rod advances. As a result, it becomes skewered, and a smooth and highly reliable nut supply can be achieved.

Further, a gap is provided between the sliding rod and the guide pipe, and a support hole is formed at the end of the guide pipe on the temporary fixing chamber side in a state where the diameter is smaller than the inner diameter of the guide pipe. Therefore, the space length between the sliding rod and the guide pipe can be secured as long as possible, and even if the sliding rod remains slightly curved or bent, it may rub against the inner surface of the guide pipe. Smooth operation can be obtained without frictional resistance becoming a problem.

It is sectional drawing of the whole apparatus. It is sectional drawing (2)-(2) of FIG. It is sectional drawing (3)-(3) of FIG. It is a side view which shows the nut supply operation. It is a partial perspective view of a supply pipe. It is the figure which looked at the temporary fixing room from the bottom. It is a partial sectional view of the device.

Next, a mode for carrying out the projection nut supply device of the present invention will be described.

1 to 7 show examples of the present invention.

First, the projection nut will be described.

It is illustrated in FIG. 7 for easy understanding. The nut 1 has a screw hole 3 formed in the center of a square nut body 2, and welding protrusions 4 are formed at four corners of the nut body 2. The nut 1 is made of iron.

Next, the air cylinder will be described.

The air cylinder 5 is composed of a cylinder 6, a piston 7, a supply rod 8, and a joining member 9. The cylinder 6 is a tubular member having a circular cross section, and a piston 7 is inserted therein in a sliding state. An O-ring (O-ring) 10 made of synthetic rubber or the like is attached to the piston 7 to maintain airtightness. The air cylinder 5 is fixed to a stationary member 20 such as a machine frame of the device.

The supply rod 8 is configured with a sliding rod 12 having a longer piston rod and a guide rod 13 having a diameter smaller than that of the sliding rod 13 and entering into the screw hole 3 of the nut 1. That is, the sliding rod 12 has a long piston rod. An extruded surface 11 is formed at the boundary between the sliding rod 12 and the guide rod 13.

A sliding hole 14 is provided in the joining member 9 arranged at the end of the cylinder 6, and the sliding rod 12 penetrates in a slidable state. An O-ring 15 made of synthetic rubber or the like is assembled in the sliding hole 14 to maintain airtightness.

A hexagonal flange 18 is formed between the cylinder-side male thread 16, the guide tube-side male thread 17, and both male threads 16 and 17 on the joining member 9. The cylinder-side male screw 16 is screwed into the female screw formed at the end of the cylinder 6, and the guide pipe-side male screw 17 is screwed into the female screw formed at the end of the guide pipe 19, and is screwed into the air cylinder 5 via the joining member 9. The guide tube 19 is coaxially integrated. The flange 18 is turned with a tool to tighten the screws.

When air pressure acts on the first end surface 22 of the piston 7, the supply rod 8 advances. Therefore, an air port 23 is provided at the end of the cylinder 6, and an air pipe 24 is connected to the air port 23. When air pressure acts on the second end surface 25 of the piston 7, the supply rod 8 retracts. Therefore, an air port 26 is provided at the outer peripheral end of the cylinder 6, and an air pipe 27 is connected to the air port 26.

Next, the guide tube will be described.

The guide tube 19 is also a tubular member having a circular cross section, and is integrated with the air cylinder 5 as described above. The inner diameter of the guide pipe 19 is set to be larger than the diameter of the sliding rod 12, so that a gap 21 is provided between the sliding rod 12 and the guide pipe 19.

Next, the temporary fixing room will be described.

As shown in FIGS. 3 and 5, the supply pipe 28 that feeds the nut 1 has a rectangular cross section and is connected to the end of the guide pipe 19 by welding or the like. In the supply pipe 28, a lid plate 30 is joined to a supply pipe main body 29 having a U-shaped cross section by welding or the like, and a nut 1 sent from a parts supply source such as a parts feeder (not shown) is conveyed. .. The parts painted in black in each figure are the welded parts.

The end of the outer peripheral portion of the guide tube 19 is scraped off to form a flat receiving surface 31, and a thick plate-shaped stopper member 32 is pressed against the flat receiving surface 31. A temporary fixing chamber 33 is formed at a position where the guide pipe 19 and the supply pipe 28 are connected. The stopper surface 35 of the stopper member 32 forms a part of the inner surface of the temporary fixing chamber 33. A permanent magnet 34 is embedded in the stopper member 32, and the nut 1 is drawn from the supply pipe 28 into the temporary fixing chamber 33 and attracted to the stopper surface 35.

A holding metal fitting 36 is welded to the outer peripheral surface of the guide pipe 19, and the stopper member 32 is pressed against the receiving surface 31 by a fixing bolt 37 screwed into the holding metal fitting 36. Reference numeral 38 indicates a lock nut that prevents loosening. The lid plate 30 is cut at a position separated from the stopper surface 35 in order to form an opening 39 for delivering nuts in the temporary fixing chamber 33.

The relative positions of the temporary fixing chamber 33 and the supply rod 8 are set so that the screw hole 3 of the nut 1 which is received by the stopper surface 35 and is stopped at a predetermined position of the temporary fixing chamber 33 and the supply rod 8 are coaxial with each other. Has been done. In order to have such a positional relationship, the relative positions of the stopper surface 35 and the support hole 41 described later are set.

When the supply rod 8 advances, the guide rod 13 enters the screw hole 3 of the nut 1 temporarily locked in the temporary fixing chamber 33, the extrusion surface 11 abuts on the upper surface of the nut 1 and the nut 1 is extruded. As shown, it is transferred to the guide pin 44 of the fixed electrode 43. Reference numeral 45 indicates a steel plate component mounted on the fixed electrode 43. The illustration of the movable electrode with respect to the fixed electrode 43 is omitted.

Next, the support hole will be described.

A support hole 41 having a diameter smaller than the inner diameter of the guide pipe 19 is formed at the end of the guide pipe 19 on the temporary fixing chamber 33 side. The support hole 41 is coaxial with the through hole 42 formed in the upper surface of the supply pipe main body 29. In the state where the supply rod 8 is retracted, as shown in FIG. 7, the sliding rod 12 is supported in a state where a slight sliding gap C1 is left in the support hole 41. The sliding gap C1 has a clearance size capable of absorbing the amount of displacement of the outer peripheral surface of the sliding rod 12 due to the bending or bending even if the supply rod 8 is slightly curved or bent.

For example, when the length of the sliding rod 12 is 500 mm and the diameter is 9 mm, it is difficult to visually discriminate a minute bending or bending state, but the bending or bending causes the sliding rod 12 to bend from a straight virtual axis. There are cases where the bent supply rod axis is displaced by 0.5 mm. The sliding gap C1 shown in FIG. 7 is set to a value such that such an amount of deviation of the axis line is absorbed. In other words, when there is a deviation of 0.5 mm, the outer peripheral surface of the sliding rod 12 advances and retreats while rubbing the inner peripheral surface of the support hole 41. Therefore, the sliding gap C1 is set to 0.5 mm.

Further, as shown in FIG. 7, the sliding gap C1 between the sliding rod 12 and the support hole 41 is formed from the gap C2 between the guide rod 13 and the screw hole 3 which has entered the screw hole 3 of the nut 1. Is also set small.

It is also possible to replace the permanent magnet with an electromagnet.

The effects of the examples described above are as follows.

In the structure of the embodiment, the air cylinder 5 in which the piston 7 and the piston rod are integrally moved back and forth in the cylinder 6 is joined to the hollow guide pipe 19 via the joining member 9, and the guide pipe 19 and the nut 1 are fed. A stopper member 32 having a stopper surface 35 formed therein is arranged at a position where the supply pipe 28 to be supplied is connected to form a temporary fixing chamber 33 for the nut 1, and the supply rod 8 has a long piston rod itself. The slidable sliding rod 12 and the guide rod 13 having a diameter smaller than that of the sliding rod 12 and entering the screw hole 3 of the nut 1 are integrally formed, and the sliding rod is formed in the sliding hole 14 of the joining member 9. The relative positions of the temporary fixing chamber 33 and the supply rod 8 are set so that the screw hole 3 of the nut 1 penetrating the temporary fixing chamber 33 and the supply rod 8 are coaxial with each other, and the sliding rod A gap 21 is formed between the guide tube 19 and the guide tube 19, and a support hole 41 having a diameter smaller than the inner diameter of the guide tube 19 is formed at the end of the guide tube 19 on the temporary fixing chamber 33 side, so that the supply rod 8 retracts. At this time, a slight sliding gap C1 is set between the sliding rod 12 and the support hole 41.

In the state where the supply rod 8 is retracted, the upper end portion of the sliding rod 12 is in a sliding state on the inner surface of the cylinder 6 via the piston 7, and the sliding hole 14 of the joining member 9 is in the lower end portion of the cylinder. The guide pipe 19 is supported in a slidable state, and a gap 21 is formed between the sliding rod 12 and the guide pipe 19, and the guide pipe 19 is located at the end of the guide pipe 19 on the temporary fixing chamber 33 side. A support hole 41 having a diameter smaller than the inner diameter of the rod 8 is formed, and the sliding rod 12 is supported in a state where a slight sliding gap C1 is left in the support hole 41 in a state where the supply rod 8 is retracted.

As described above, when the supply rod 8 is viewed in full length, the upper end portion is in a sliding state via the piston 7, the intermediate portion is supported in a slidable state by the sliding hole 14 of the joining member 9, and the lower end portion is slidable. The portion is supported by a support hole 41 formed at the end of the guide pipe on the temporary fixing chamber 33 side. In other words, the long supply rod 8 is supported in a bearing shape at three places, a piston 7, a joining member 9, and a support hole 41 at the end of the guide pipe, and the other parts are surrounded by space. Has been done.

Since the gap 21 is formed between the sliding rod 12 and the guide tube 19, the sliding rod 8 rubs against the inner surface of the guide tube 1 even if the supply rod 8 has a slight curvature or bending. There is no problem, frictional resistance does not matter, and smooth advancing and retreating movements can be obtained.

Further, since a slight sliding gap C1 is provided between the sliding rod 12 and the support hole 41, even if the supply rod 12 is curved or bent, the sliding section between the sliding rod 12 and the support hole 41 is rubbed. Will be slightly longer and the problem of rubbing resistance will be milder.

The sliding gap C1 between the sliding rod 12 and the support hole 41 is set to be smaller than the gap C2 between the guide rod 13 and the screw hole 3 that has entered the screw hole 3 of the nut 1.

The sliding rod 12 is supported with a slight sliding gap C1 left in the support hole 41, and the sliding gap C1 between the sliding rod 12 and the support hole 41 is the guide rod 13 that has entered the screw hole 3. It is set smaller than the gap C2 between the screw hole 3 and the screw hole 3. Therefore, even if the sliding rod 12 is rubbed against one side of the inner surface of the support hole 41, the tip of the guide rod 13 does not deviate from the opening circle of the screw hole 3, and the guide rod 13 is screwed when the supply rod advances. It is normally inserted into the hole 3 and becomes skewered, so that a smooth and highly reliable nut supply can be achieved.

Further, a gap 21 is provided between the sliding rod 12 and the guide pipe 19, and the support hole 41 is formed at the end of the guide pipe 19 on the temporary fixing chamber 33 side in a state of having a diameter smaller than the inner diameter of the guide pipe 19. Has been done. Therefore, the space length between the sliding rod 12 and the guide pipe 19 can be secured as long as possible, and even if the sliding rod 12 has a slight curvature or bending, it rubs against the inner surface of the guide pipe. There is no problem, and smooth operation can be obtained without frictional resistance becoming a problem.

As described above, according to the apparatus of the present invention, the problem of minute bending or bending of the supply rod, which occurs when the entire sliding rod is composed of the piston rod itself, is solved, and a smooth supply rod can be provided. Ensuring forward / backward movement. Therefore, it can be used in a wide range of industrial fields such as a body welding process for automobiles and a sheet metal welding process for home appliances.

1 Projection nut 2 Nut body 3 Screw hole 4 Welding protrusion 5 Air cylinder 6 Cylinder 7 Piston 8 Supply rod 9 Joining member 12 Sliding rod 13 Guide rod 14 Sliding hole 19 Guide pipe 21 Void 28 Supply pipe 32 Stopper member 33 Temporary Stop chamber 35 Stopper surface 41 Support hole C1 Sliding gap C2 Gap between guide rod and screw hole

Claims (1)

An air cylinder in which the piston and the piston rod are integrally moved back and forth in the cylinder is joined to a hollow guide pipe via a joining member arranged at the end of the air cylinder.
The piston rod is passed through a sliding hole provided in the joining member, and the piston rod is supported by the piston and the joining member in a state where it can move forward and backward.
A stopper member having a stopper surface is arranged at a position where the guide pipe and the supply pipe for feeding the nut are connected to form a temporary fixing chamber for the nut.
The supply rod is integrally formed with a sliding rod in which the piston rod itself is elongated and a guide rod having a diameter smaller than that of the sliding rod and entering the screw hole of the projection nut, and the sliding rod is minute. It has a curve or bend,
The relative position of the temporary fixing chamber and the supply rod is set so that the screw hole of the projection nut received by the stopper surface and stopped in the temporary fixing chamber is coaxial with the supply rod.
A gap is formed between the sliding rod and the guide pipe, and a support hole having a diameter smaller than the inner diameter of the guide pipe is formed at the end of the guide pipe on the temporary fixing chamber side.
The length of the gap between the sliding rod and the guide pipe as viewed in the length direction of the sliding rod is the end of the guide pipe on the temporary fixing chamber side where the support hole is not formed. By being formed on the member of the portion, it is set longer than the length of the support hole.
In a state where the supply rod is retracted, the sliding rod is supported with a slight sliding gap left in the support hole.
The sliding gap has a size that can absorb the amount of displacement of the outer peripheral surface of the sliding rod due to bending or bending.
The upper end of the supply rod is slidable with respect to the cylinder via the piston, and the intermediate portion is slidably supported by the sliding holes of the joining member, and the lower end is slidable. Is supported at three locations of the support holes formed at the end of the guide pipe on the temporary fixing chamber side.
The projection nut is characterized in that the sliding gap between the sliding rod and the support hole is set to be smaller than the gap between the guide rod and the screw hole that has entered the screw hole of the projection nut. Supply device.

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