JPH11311210A - Actuator with rod and external scraper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic cylinder actuator with rod, which can keep a function to scrape the foreign matters stuck to a rod proper for a long period. SOLUTION: In a hydraulic cylinder 1 provided with a rod 15 which can advance toward and retreat from a cylinder case 2, a rod cover 6 is provided with a coil scraper 21, and a plate-shaped external scraper 22 is attached to the rod protrusion face of the cylinder case 2. The external scraper 22 is formed with a rod insertion hole 23, and foreign matters such as spatters stuck to a rod 15 is scraped by a part around the rod insertion hole 23 of the external scraper 22, and the foreign matters left not scraped are scraped by the coil scraper 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator with a rod having an externally exposed rod, such as a hydraulic cylinder, and an external scraper suitable for use by being attached to the rod-mounted actuator.

[0002]

2. Description of the Related Art Actuators such as fluid pressure cylinders are frequently used in equipment for automatically performing welding work, such as a vehicle body assembly site.

For example, in a fluid pressure cylinder, an electrode of a welding machine is held at the tip of a rod and the rod is moved forward and backward so that the electrode is arranged at a predetermined welding position, or the rod is supported by supporting a body to be welded on the rod. For example, by moving the workpiece to a predetermined welding position by moving the rod forward or backward, and by pressing the rod at the tip of the rod to move the rod forward and backward, the workpiece positioned at the predetermined welding position can be fixed at that position. There are uses.

[0004] The fluid pressure cylinders used in these applications are generally welded in a state in which a rod protrudes from the cylinder body. For this reason, spatters jumping out of the welding site adhere to the rod. When the rod to which the spatter adheres enters the cylinder main body, the spatter damages the rod packing and the like, and causes fluid leakage from the cylinder chamber.

When this fluid leakage occurs, not only must the hydraulic cylinder be replaced, but in some cases the production line must be stopped during the welding operation, resulting in a great disadvantage in production efficiency. .

Therefore, as a countermeasure against sputtering, conventionally,
A single coil scraper is provided in the rod cover of the fluid pressure cylinder, and the coil scraper is used to scrape off the spatter adhered to the rod surface. By the scraping action of the coil scraper, spatter does not enter the cylinder body side than the coil scraper, and it is possible to prevent a seal member such as a rod packing from being damaged.

[0007]

However, with a single coil scraper in the rod cover described above, spot welding can provide a certain scraping effect if it is spot welding. If a large spatter jumps out and adheres to the rod, the coil scraper itself immediately impairs the scraping effect. In fact, hydraulic cylinders with a single coil scraper have reached a life of several months when used for arc welding.
Of course, spot welding does not have a satisfactory life.

As one proposal for solving such a problem, Japanese Utility Model Laid-Open No. 2-59878 and Japanese Utility Model Laid-Open No.
In Japanese Patent Application Publication No. 59879, there is provided a sleeve or a boot that surrounds the rod inside the cylinder body without the rod packing so that the rod packing or the like is not damaged even if the foreign matter is drawn into the cylinder body while adhering to the rod. .

However, in this configuration, the structure of the fluid pressure cylinder itself becomes complicated and very expensive. In addition, the sleeve or the boot in the cylinder body must slide or deform following the rod, and there is a disadvantage that the operating resistance of the rod is large or the sleeve or the boot is easily damaged in the cylinder body. Furthermore, since foreign matter such as spatter adhered to the rod remains on the rod as it is, the foreign matter deposited on the rod may interfere with the entrance of the cylinder body and hinder smooth movement of the rod. As described above, the technology proposed in the above-mentioned conventional publication has not yet reached a fundamental solution when used in an environment where foreign matter such as spatter adheres to the rod.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an actuator with a rod capable of maintaining a function of scraping foreign substances adhered to a rod for a long time. It is in. Another object of the present invention is to make it possible to easily attach a scraper to an existing actuator with a rod regardless of whether a scraper is provided on the existing actuator with a rod. Still another object is to enable the replacement of only the scraper without disassembling the actuator with rod.

[0011]

Means for Solving the Problems and Effects of the Invention In order to solve the above-mentioned problems, according to the first aspect of the present invention, there is provided an actuator with a rod having a rod which can move forward and backward with respect to an actuator body. A plurality of scrapers for scraping foreign matter adhered to the rod were arranged in the axial direction of the rod.

By the above means, the foreign matter adhering to the rod is scraped by a plurality of scrapers. Therefore, even if the scraping effect of one scraper is reduced due to wear or the like, the scraping effect can be maintained by another scraper. Further, the load for scraping foreign substances can be distributed to a plurality of scrapers. As a result, the function of scraping foreign matter attached to the rod can be maintained for a long time.

According to a second aspect of the present invention, in the rod-equipped actuator having the rod which can be advanced and retracted with respect to the actuator body, an external scraper for scraping foreign matter adhered to the outer peripheral surface of the rod is provided, and the rod is inserted through the external scraper. The external scraper was attached to the rod protruding surface of the actuator body with the rod inserted through the rod insertion hole.

By the above-mentioned means, the foreign matter adhering to the rod is scraped off by the external scraper. This external scraper has a rod insertion hole through which the rod is inserted, and can be attached to the rod projecting surface of the actuator body with the rod inserted. On the other hand, a foreign matter scraping effect can be imparted to the actuator with a rod having an existing internal scraper, and the foreign matter scraping effect can be enhanced. Moreover,
In the case of the external scraper, the installation space is smaller than that of the existing internal scraper, so that a relatively large external scraper can be attached. In this case, the function of scraping foreign substances adhered to the rod is maintained for a long time. It becomes possible.

According to a third aspect of the present invention, in the actuator with a rod, the rod-equipped rod includes a rod capable of moving forward and backward with respect to the actuator main body, and an internal scraper for scraping foreign matter adhered to the rod outer peripheral surface inside the actuator main body. An external scraper is provided for scraping foreign matter adhered to the outer peripheral surface of the rod, a rod insertion hole through which the rod is inserted is formed in the external scraper, and the external scraper is inserted into the rod insertion hole in a state where the rod is inserted through the rod insertion hole. It was attached to the protruding surface.

[0016] By the above means, the foreign matter adhering to the rod is scraped off by the external scraper. This external scraper has a rod insertion hole through which the rod is inserted, and can be attached to the rod projecting surface of the actuator body with the rod inserted. On the other hand, the foreign substance scraping effect can be enhanced. In addition, in the case of the external scraper, since the installation space is less restricted than the existing internal scraper, a relatively large external scraper can be attached. In this case, the function of scraping foreign substances adhered to the rod has been provided for a long time. It can be maintained.

According to a fourth aspect of the present invention, in the actuator with the rod according to the second or third aspect, the external scraper is detachably attached to the actuator body.

By the above means, even if the external scraper reaches its life due to wear or the like due to long-term use, only the external scraper need be replaced without replacing the actuator itself. As a result, there is an effect that the scraping effect can be easily restored at low cost.

According to a fifth aspect of the present invention, in the actuator with rod according to any one of the second to fourth aspects, the external scraper is formed in a flat plate shape. By the above means, the amount of protrusion of the external scraper attached to the rod projecting surface side from the actuator main body can be suppressed, and the size of the actuator can be prevented from being increased.

According to a sixth aspect of the present invention, in the actuator with a rod according to any one of the second to fourth aspects, the external scraper has a rod insertion hole portion formed as a vertex projecting toward the rod tip. It was formed in a tapered shape.

According to the above-mentioned means, the foreign matter scraped off from the rod at the rod insertion hole of the external scraper falls along the tapered surface, so that the foreign matter does not accumulate at the rod insertion hole.

According to a seventh aspect of the present invention, in the actuator with a rod according to any one of the second to sixth aspects, the actuator body and the external scraper are provided with mounting holes at positions corresponding to each other. The fixing is performed by inserting a rod-shaped fixing member, and the mounting hole of the external scraper is formed larger than the outer diameter of the fixing member.

According to the above-mentioned means, when the external scraper is mounted on the actuator main body, mounting holes having a corresponding relationship may be formed in advance and the fixing member may be simply inserted and fixed. The structure and the operation for mounting the slab can be simplified. Here, if there is no play between the mounting hole of the external scraper and the fixing member, manufacturing errors and the like cannot be absorbed, and the rod may be twisted. However, since the mounting hole of the external scraper is formed larger than the outer diameter of the fixing member, it is possible to prevent the rod from strongly interfering with the rod insertion hole after mounting the external scraper.

According to an eighth aspect of the present invention, in the actuator with a rod according to any one of the second to seventh aspects, the rod insertion hole of the external scraper has a slight gap with the rod outer peripheral surface. Is formed.

According to the above-mentioned means, the rod can be smoothly advanced and retracted regardless of a manufacturing error between the rod insertion hole of the external scraper that can be retrofitted and the rod. According to a ninth aspect of the present invention, in the actuator with a rod according to any one of the second to eighth aspects, the actuator body is a cylinder body, and the rod is adapted to a fluid pressure acting on a piston housed in the cylinder body. It is determined that the piston rod moves based on this.

By the above means, the piston moves based on the fluid pressure supplied to and discharged from the cylinder body, and the piston rod moves forward and backward with the movement of the piston. Here, in a fluid pressure driven cylinder, a plurality of seal members such as a rod packing for sealing around a piston rod are used. Above all, the rod packing is more likely to be damaged by foreign matter adhering to the outer peripheral surface of the rod, but the breakage of the seal member can be prevented by a plurality of scrapers or external scrapers.

According to a tenth aspect of the present invention, in the actuator with the rod according to the ninth aspect, a rod cover through which a piston rod is inserted is mounted on the cylinder body.
The rod cover is provided with a piston packing that is slidably contacted with the piston rod, and the scraper is disposed on the side of the rod cover opposite to the piston.

By the above means, the rod packing which is most likely to be damaged by foreign matter adhering to the rod can be reliably protected and the life of the fluid pressure cylinder can be extended. According to the eleventh aspect of the present invention, there is provided an external scraper attached to the actuator main body for scraping foreign matter attached to the rod which is driven forward and backward with respect to the actuator main body, wherein the rod insertion hole through which the rod is inserted; And a mounting portion for the

According to the above-mentioned means, an external scraper which can be retrofitted to the rod-equipped actuator and has a function of scraping foreign substances adhered to the rod can be obtained.
This external scraper can be attached without disassembling the inside of the actuator with rod.

According to the twelfth aspect of the present invention, the eleventh aspect provides
In the external scraper described above, the mounting portion is a plurality of mounting holes respectively corresponding to the plurality of mounting holes formed in the actuator body.

By the above means, the structure for attaching the external scraper to the actuator body can be simplified.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment]
An embodiment will be described with reference to FIGS.

The hydraulic cylinder 1 as an actuator with a rod has a cylinder case 2. The cylinder case 2 is a cylinder tube made of a metal extruded material such as aluminum, and has a substantially square pillar shape as a whole. As shown in FIG. 2, through holes 2 a penetrating in the longitudinal direction of the cylinder case 2 are formed at four corners of the cylinder case 2. Each through hole 2a is a screw hole. In the center of the cylinder case 2, a cylinder hole 3 penetrating in the longitudinal direction of the cylinder case 2 is formed. A large-diameter portion 4 having a larger diameter than the intermediate portion is formed on the distal end side and the proximal end side of the cylinder hole 3.

A head cover 5 and a rod cover 6 are inserted into the cylinder case 2 so as to close the cylinder hole 3 from both ends. That is, the two covers 5 and 6 are arranged such that a part thereof is fitted to the large diameter part 4 and the other part is fitted to the cylinder hole 3. It is in contact with the step. In this state, the covers 5 and 6 are prevented from coming off by the C-rings 7 and 8, respectively. O-rings 9 and 10 are attached to the outer peripheral surfaces of both covers 5 and 6 so as to be in close contact with the inner peripheral surface of cylinder hole 3 of cylinder case 2. Therefore, the cylinder hole 3 is a cylinder chamber that is airtightly held by the two covers 5 and 6.

A piston 11 is accommodated in the cylinder chamber in the cylinder case 2 so as to be movable in the longitudinal direction of the cylinder case 2. A piston packing 12 that is in close contact with the inner peripheral surface of the cylinder case 2 is mounted on the outer peripheral surface of the piston 11. Accordingly, the piston 11 divides the cylinder chamber into a head-side cylinder chamber 13 and a rod-side cylinder chamber 14.

A rod 15 is provided integrally with the piston 11, and the rod 15 projects outside through a rod hole 16 formed through the rod cover 6. An annular packing receiving groove 17 is formed on the inner peripheral surface corresponding to the rod hole 16 of the rod cover 6.
Accommodates a flexible rod packing 18 made of rubber.

The rod packing 18 has a U-shape in which a pair of lips are directed toward the piston 11. When pressure acts on the rod-side cylinder chamber 14, the two lips expand to each other, and the rod cover 6 and the rod 15 are expanded. To prevent fluid leakage from between Further, the rod packing 18 has a scraper portion 18a directed to the inner peripheral side and the opposite side of the piston 11, and the scraper portion 18a is always slidably in contact with the rod 15 to scrape off foreign substances attached to the outer peripheral surface of the rod 15.

A pair of supply / discharge ports 19a and 19b are formed on the side surface of the cylinder case 2 at both ends in the longitudinal direction. The first supply / discharge port 19a communicates with the head side cylinder chamber 13 and the second supply / discharge port 19a.
“b” communicates with the rod-side cylinder chamber 14. Therefore, by supplying the fluid from the first supply / discharge port 19a and discharging the fluid from the second supply / discharge port 19b,
The piston 11 moves toward the rod-side cylinder chamber 14 and the rod 15 projects. On the other hand, by discharging the fluid from the first supply / discharge port 19a and supplying the fluid from the second supply / discharge port 19b, the piston 11 moves toward the head-side cylinder chamber 13 and the rod 15 is retracted.

An annular scraper accommodating groove 20 is formed on the inner peripheral surface of the rod cover 6 corresponding to the rod hole 16. The scraper housing groove 20 is formed on the side opposite to the piston 11 at a predetermined interval from the packing housing groove 17. A coil scraper 21 as an internal scraper is housed in the scraper housing groove 20.

As shown in FIG. 3, the coil scraper 21 is formed by winding a metal plate into a coil shape, and has an inner diameter smaller than that of the rod 15. The material of the coil scraper 21 is a copper alloy, specifically, chromium copper. The rod 15 is fitted to the coil scraper 21 with the diameter of the coil scraper 21 expanded.

The coil scraper 21 is always in sliding contact with the outer peripheral surface of the rod 15 by its own spring force.
5 Scrape off foreign matter adhering to the outer peripheral surface. When the coil scraper 21 is accommodated in the scraper accommodating groove 20, the outer diameter of the coil scraper 21 is larger than the groove diameter of the scraper accommodating groove 20 so that the rod 15 is allowed to move in a direction intersecting (perpendicular to) the axial direction of the rod 15. The diameter is smaller. In addition, the thickness of the coil scraper 21 is formed to about 0.8 mm.

An external scraper 22 is mounted on the surface of the cylinder case 2 on the side where the rod 15 protrudes. Although the material of the external scraper 22 is made of pure copper in the present embodiment, a copper alloy may be used, and chromium copper is particularly preferable. The external scraper 22 has a plate shape having substantially the same shape and size as the surface of the cylinder case 2 on the side of the rod 15 protruding. In the present embodiment, the thickness of the external scraper 22 is formed to be 3.2 mm.
m or more. It is preferable that the plate thickness is at least larger than the thickness of the coil scraper 21.

A rod insertion hole 23 through which the rod 15 is inserted is formed in the center of the external scraper 22, and mounting holes as mounting portions corresponding to the through holes 2a of the cylinder case 2 are formed at four corners. 24 are formed. Then, the rod 15 is inserted into the rod insertion hole 23, and a hexagon socket head cap screw 25 as a rod-shaped fixing member is screwed in with each mounting hole 24 corresponding to each through hole 2a. The external scraper 22 is fixed in a state in which the external scraper 22 is in contact with the surface of the rod 15 protruding side.
Each through-hole 2a functions as a mounting hole for mounting the external scraper 22.

The inner diameter of the rod insertion hole 23 is formed slightly larger than the outer diameter of the rod 15, and
There is a slight clearance between 3 and rod 15.
Also, the inner diameter of each mounting hole 24 is formed slightly larger than the bolt diameter of the bolt 25, and each mounting hole 24 and the bolt 2
There is a slight clearance between them.

Although not shown, a wear ring for reducing sliding resistance, a magnet for detecting the piston position, and the like may be mounted on the outer peripheral surface of the piston 11. At the time of mounting the magnet, the piston position detecting device may be mounted on the outer surface of the cylinder case 2. Also, piston 1
Cushion rubber may be attached to both sides in the moving direction of 1 to reduce impact at the stroke end. Further, a bush for reducing the sliding resistance of the rod 15 may be mounted on the inner peripheral surface of the rod cover 6.

Next, the operation of the hydraulic cylinder 1 configured as described above will be described. Many fluid pressure cylinders 1 are used as equipment for automatically performing welding work at a vehicle body assembly site of a vehicle. One hydraulic cylinder 1 has a rod 15
An electrode of a welding machine is held at the tip, and the electrode is arranged at a predetermined welding position by projecting the rod 15, while the electrode is arranged at a retracted position from the welding position by immersing the rod 15. Another fluid pressure cylinder 1 supports a workpiece, that is, a workpiece, on a rod 15,
The to-be-welded body is arranged at a predetermined welding position by projecting the rod 15, while the to-be-welded body is arranged at a retracted position from the welding position by immersing the rod 15. Further, still another hydraulic cylinder 1 is equipped with a pressing tool at the tip of the rod 15 and fixes the object to be welded arranged at a predetermined welding position at that position by protruding the rod 15, while fixing the rod 15. The fixing of the object to be welded is released by immersion.

The forward / backward movement of the rod 15 of each hydraulic cylinder 1 used in each of the above parts
a, 19b based on the supply and discharge of the fluid. Here, the welding operation is performed by the rod 15 of each of the hydraulic cylinders 1.
Is carried out in a state where it protrudes. Then, spatter jumps out of the welding portion, and the spatter adheres to the outer peripheral surface of the rod 15.

After the welding operation is completed, the two supply / discharge ports 19a, 1
The rod 15 is immersed in the cylinder case 2 based on the supply and discharge of the fluid to and from the cylinder 9b. During this immersion, the spatter attached to the outer peripheral surface of the rod 15 interferes with the periphery of the rod insertion hole 23 of the external scraper 22 and is scraped off. Here, most of the spatter is scraped off, but the inner diameter of the rod insertion hole 23 is formed slightly larger than the outer diameter of the rod 15, so that a little spatter remains on the outer peripheral surface of the rod 15. The slightly remaining spatter is scraped off by the coil scraper 21 mounted on the rod cover 6.

As a result, almost no spatter enters the inside of the cylinder case 2 from the coil scraper 21 and the rod packing 18 is prevented from being damaged. Since the rod packing 18 itself is also provided with the scraper portion 18a, dust and the like do not enter the inside thereof. As a result, the period until the end of the life can be greatly lengthened as compared with a hydraulic cylinder having no external scraper 22.

The fluid pressure cylinder 1 is periodically blown with air. By this air blowing, spatters and the like accumulated on the external scraper 22 after the scraping are blown off.

If the fluid pressure cylinder 1 is used for a long period of time, the effect of the external scraper 22 for scraping most of the spatter may be reduced. The cause may be abrasion of the inner peripheral surface of the rod insertion hole 23 of the external scraper 22. In this case, bolt 2
Since the external scraper 22 can be easily removed from the cylinder case 2 by removing the outer scraper 5, only the replacement with a new external scraper 22 needs to be performed, and the replacement of the fluid pressure cylinder 1 is unnecessary for the time being.

When attaching the external scraper 22,
After the rod 15 is inserted into the rod insertion hole 23 of the external scraper 22, the mounting hole 24 may be tightened and fixed by the bolt 25 in correspondence with the through hole 2a. in this case,
Since the inner diameter of the rod insertion hole 23 is formed larger than the outer diameter of the rod 15, the rod 15 can be arranged so as not to interfere with the external scraper 22 corresponding to the rod insertion hole 23. Moreover, since the inner diameter of the mounting hole 24 is larger than the outer diameter of the bolt 25, the positioning of the rod insertion hole 23 is performed as described above, and then the bolt 25 is stopped while maintaining the positioning state. This makes it possible to absorb manufacturing errors and assembly errors.

Therefore, according to the first embodiment, the following effects can be obtained. (1) Since the external scraper 22 is provided in addition to the coil scraper 21 serving as the internal scraper, the foreign substances attached to the rod 15 can be scraped off by the plurality of scrapers 21 and 22. Therefore, even if the scraping effect of the external scraper 22 is reduced due to wear or the like, the scraping effect can be maintained by the coil scraper 21. Further, the load for scraping foreign substances can be distributed to the plurality of scrapers 21 and 22. As a result, the function of scraping foreign matter adhered to the rod 15 can be maintained for a long time, as compared with the case where only the single coil scraper 21 is provided.

(2) Since the external scraper 22 has less restrictions on the installation space than the coil scraper 21 which is an internal scraper, the external scraper 22 can be a relatively thick external scraper. Therefore, the life of the external scraper 22 does not easily reach its end, and the rod 15
It is possible to maintain the function of scraping foreign substances adhering to the device for a longer period of time.

(3) The external scraper 22 is detachable from the cylinder case 2. Therefore, even if the life of the external scraper 22 is reached due to wear or the like due to long-term use, it is sufficient to simply replace the external scraper 22 without replacing the fluid pressure cylinder 1 itself. As a result, the scraping effect can be restored easily at low cost.

(4) The effects of the above (1) to (3) and the fact that each of the scrapers 21 and 22 is disposed closer to the piston 11 than the rod packing 18 can prevent the rod packing 18 from being damaged for a long time. Can be prevented.

(5) The external scraper 22 has a flat plate shape. Further, the external scraper 22 is formed in the same shape and the same size as the surface of the cylinder case 2 on the rod 15 projecting side. Therefore, the amount of protrusion of the external scraper 22 from the cylinder case 2 can be minimized, and the size of the entire hydraulic cylinder 1 can be prevented.

(6) When attaching the external scraper 22 to the cylinder case 2, an attachment hole 24 corresponding to the through hole 2a of the cylinder case 2 may be formed in advance.
Moreover, since it is sufficient to simply insert and tighten the bolt 25, the structure and operation for mounting the external scraper 22 can be simplified. In addition, since the through-hole 2a for installing the cylinder 1 is often provided in the hydraulic cylinder 1 in advance, using the through-hole 2a involves a structural change of the hydraulic cylinder 1 itself. A foreign matter scraping function can be added without the need.

(7) The rod insertion hole 23 of the external scraper 22 is formed slightly larger than the outer diameter of the rod 15. Thereby, the rod 15 can be smoothly advanced and retracted regardless of a manufacturing error or an assembly error between the rod insertion hole 23 of the external scraper 22 that can be retrofitted and the rod 15.

(8) The mounting hole 24 of the external scraper 22 is formed slightly larger than the outer diameter of the bolt 25. here,
If there is no play between the mounting hole 24 of the external scraper 22 and the bolt 25, manufacturing errors and the like cannot be absorbed and the rod 15 will be twisted. But,
Here, since the bolt 25 can be fixed after the positional relationship between the rod 15 and the rod insertion hole 23 is determined, it is possible to prevent the rod 15 from strongly interfering with the rod insertion hole 23 after the external scraper 22 is attached.

(9) The coil scraper 21 and the external scraper 22 were formed of a metal material containing at least copper, that is, pure copper or a copper alloy. Since copper is contained in this manner, thermal conductivity is high, and high-temperature spatter is generated by the coil scraper 21.
And the possibility of sticking to the external scraper 22 is low,
The scraping effect can be maintained for a long time. In particular, copper alloys, particularly chromium copper, have excellent wear resistance, and are suitable for suppressing a reduction in the scraping effect of the coil scraper 21 and the external scraper 22 due to wear.

(10) Set the thickness of the external scraper 22 to 3.
The thickness was at least 3 mm or more as 2 mm. This is because the installation space of the coil scraper 21, which is an internal scraper, is greatly restricted and it is difficult to increase the size of the coil scraper 21 itself.
In the case of No. 2, attention is paid to the fact that a relatively large thickness can be formed. And, as the plate thickness is larger, the progress of wear around the rod insertion hole 23 of the external scraper 22 becomes slower, and the scraping effect can be maintained for a long time. The thickness of the external scraper 22 is preferably larger than the thickness of the coil scraper 21. The maximum value of the thickness of the external scraper 22 is determined according to the individual size and stroke of the hydraulic cylinder 1.

(11) The hydraulic cylinder 1 was applied as one working member of a welding device. This makes it possible to reliably and reliably remove spatters jumping out of the welded site. In particular, when the spatter is used for arc welding having a high temperature and a large particle diameter, the effect is remarkable.

[Second Embodiment] A second embodiment will be described below with reference to FIG. In the second embodiment, the structure itself of the hydraulic cylinder 1 and the external scraper 22 is the same as that of the first embodiment, and shows an embodiment in which the hydraulic cylinder 1 is fixed to the table 31. is there.

In this embodiment, a mounting hole 32 having a smaller diameter than the cylinder case 2 and a sufficiently larger diameter than the rod 15 is formed in the table 31. or,
Around the mounting hole 32 of the table 31, four holding holes 33 are formed corresponding to the through holes 2a and the mounting holes 24.

Then, the rod 15 is loosely inserted into the mounting hole 32 by abutting the rod projecting surface of the cylinder case 2 from one surface (the lower surface in FIG. 4) of the table 31 and the other surface of the table 31 (FIG. 4). External scraper 2 on the upper side)
The table 31 is held between the external scraper 22 and the fluid pressure cylinder 1 by inserting the bolts 25 into the mounting holes 24, the holding holes 33, and the through holes 2a from the same side and tightening the bolts 25 as shown in FIG. It has been done. In this manner, the hydraulic cylinder 1 can be easily attached to the table 31 using the external scraper 22.

[Third Embodiment] Hereinafter, a third embodiment will be described with reference to FIG. The third embodiment shows an embodiment in which another external scraper 35 is used in place of the external scraper 22 in the first embodiment.

As shown in FIG. 5, the external scraper 35 of this embodiment
It is formed in a tapered shape as an apex on the tip side. A rod 15 is provided on the outer exposed portion of the external scraper 35.
Is formed at the top.

Therefore, according to the third embodiment, the foreign matter scraped off from the rod 15 around the rod insertion hole 23 of the external scraper 35 falls along the tapered surface 36, so that the foreign matter falls on the rod insertion hole 23. No foreign matter is accumulated.
As a result, a new effect is obtained in that the scraped foreign matter does not accumulate near the rod insertion hole 23 and the smooth movement of the rod 15 is not hindered. In this embodiment, when the rod 15 is used with the tip thereof facing upward, the above-described effect becomes remarkable.

[Fourth Embodiment] Hereinafter, a fourth embodiment will be described with reference to FIG. The fourth embodiment shows an embodiment in which another external scraper 38 is used in place of the external scraper 22 in the first embodiment.

As shown in FIG. 6, the external scraper 38
The rod insertion hole 40 is formed by bending in a taper shape toward the distal end side of the rod 15 with a split 39 in the radial direction from the center. The bent portion is a scraping piece 41 to which a spring force is applied to a side pressed against the outer peripheral surface of the rod 15.

Therefore, according to the fourth embodiment, the scraping piece 41 is pressed against the outer peripheral surface of the rod 15, so that the effect of scraping foreign matter by the external scraper 38 becomes more remarkable. Can be Note that a gap is formed between the scraping pieces 41 by the formation of the split 39, and foreign matter that reaches the inside of the cylinder case 2 through the gap is scraped off by the coil scraper 21 attached to the rod cover 6.

Further, at the time of cleaning in which air is periodically blown to the fluid pressure cylinder 1, air acts on the inside through the split 39, so that foreign matter scraped off by the coil scraper 21 provided on the rod cover 6 is removed. Also has the advantage that it can be removed by air.

[Fifth Embodiment] Hereinafter, a fifth embodiment will be described with reference to FIG. In the fifth embodiment, the external scraper 22 in the first embodiment is omitted. Further, the number of the scraper accommodating grooves 20 formed in the rod cover 6 is plural, and in the present embodiment, three (two or four or more). Further, the coil scrapers 21 were accommodated correspondingly.

Therefore, according to the fifth embodiment, there is an advantage that the external scraper 22 and the like can be omitted.
Further, since the plurality of coil scrapers 21 have the same configuration, the cost can be reduced by using common components.
Further, when the number of the scrapers 21 is three or more, it is effective in that the foreign substance scraping effect is maintained for a long period of time.

[Sixth Embodiment] Hereinafter, a sixth embodiment will be described with reference to FIG. In the sixth embodiment, the scraper accommodating groove 20 and the coil scraper 21 in the first embodiment are omitted. That is, the embodiment in which the external scraper 22 is mounted on the existing hydraulic cylinder 1 having no scraper is shown.

Therefore, according to the sixth embodiment, the function of removing foreign matter on the surface of the rod 15 can be easily added to the existing hydraulic cylinder 1 having no scraper by retrofitting the external scraper 22. It has advantages and versatility.

[Seventh Embodiment] Hereinafter, a seventh embodiment will be described with reference to FIG. In the seventh embodiment, another external scraper 43 is used in place of the external scraper 22 in the sixth embodiment. On the inner peripheral surface corresponding to the rod insertion hole 23 of the external scraper 43, a plurality of (in this embodiment, two or
) Is formed. The same coil scrapers 21 as described in the first embodiment are housed in the respective scraper housing grooves 44.
Each of these coil scrapers 21 differs from the coil scraper 21 in the first embodiment and the like in that it functions as an external scraper, whereas the coil scraper 21 functions as an internal scraper.

Therefore, according to the seventh embodiment, there is an advantage that the function of removing foreign matter on the surface of the rod 15 can be easily added by retrofitting the external scraper 43, which is excellent in versatility. In addition, since the coil scraper 21 is constantly pressed against the rod 15, the foreign matter scraping effect is higher than when the rod 15 is simply inserted into the rod insertion hole 23, and the coil scraper 21 includes a plurality of coil scrapers 21. Therefore, the foreign substance scraping effect can be maintained for a long period of time.

Further, each coil scraper 21 is always in pressure contact with the outer peripheral surface of the rod 15, and, like the scraper receiving groove 20 in the first embodiment, the coil scraper 21 is Various errors can be absorbed here by being configured to be able to move in a direction intersecting (perpendicular to). Moreover, even if the diameter of the rod insertion hole 23 is formed relatively large, foreign matter can be scraped off by the coil scraper 21, so that interference between the rod insertion hole 23 and the rod 15 can be reliably prevented.

[Eighth Embodiment] An eighth embodiment will be described below with reference to FIG. In the eighth embodiment, other external scrapers 46 and 47 are used instead of the external scraper 22 in the first embodiment. The external scrapers 46 and 47 are composed of a first support plate 46 and a second support plate 47, and the scraper accommodating grooves 44 are formed by overlapping the two 46 and 47. The coil scraper 21 is housed in the scraper housing groove 44. The coil scraper 21 differs from the coil scraper 21 in the first embodiment and the like in that it functions as an external scraper, whereas the coil scraper 21 functions as an internal scraper.

Therefore, according to the eighth embodiment, the rod 15 can be easily mounted by retrofitting the external scrapers 46 and 47.
There is an advantage that a function of removing foreign matter on the surface can be added, and it is excellent in versatility. Moreover, the coil scraper 21
Is always in pressure contact with the rod 15, so that the foreign matter scraping effect is higher than when the rod 15 is simply inserted through the rod insertion hole 23.

The coil scrapers 21 mounted on the external scrapers 46, 47 are the same as those of the external scrapers 46, 47.
By removing the first support plate 46 and the second support plate 47 that constitute them at the time of removal, they can be easily replaced. Therefore, foreign object scraping is performed only by replacing the coil scraper 21 in the scraper accommodating groove 44. This is advantageous in that the function can be reproduced. Further, external scrapers 46, 4
The coil scraper 21 on the seventh side is constantly pressed against the outer peripheral surface of the rod 15, and the coil scraper 21 intersects with the rod 15 in the scraper housing groove 48 (similar to the scraper housing groove 20 in the first embodiment). Various errors can be absorbed here by being configured to be able to move in the orthogonal direction. Moreover,
Even if the diameter of the rod insertion hole 23 is relatively large, foreign matter can be scraped off by the coil scrapers 21 on the external scrapers 46 and 47, so that interference between the rod insertion hole 23 and the rod 15 can be reliably prevented. Can be.

[Other Embodiments] In addition to the embodiments described above, there are other embodiments, for example, as follows.・ As the fluid pressure cylinder 1, the piston 1
1 is moved, and a pair of chuck claws are moved by a rod 15 provided integrally with the piston 11, and a fluid pressure chuck device or the like that grasps an object to be grasped is also an embodiment of the fluid pressure cylinder. It also includes a twin-rod type fluid pressure cylinder, etc. Further, only one movement of the piston is performed by fluid pressure, and the other is moved by another driving means such as a spring force. A pressure cylinder and the like are also included.

Other than the fluid pressure cylinder 1, application to other devices driven by fluid pressure is possible, and application to an electric actuator or the like using a motor other than fluid pressure as a drive source is also possible. For example, when applied to an electric actuator, foreign substances such as spatters can be prevented from adversely affecting a transmission mechanism inside the actuator body.

The invention may be applied to a case where the rod 15 is advanced or retracted by another driving source even if the actuator itself does not have a driving source. For example, the guide block may be implemented as an actuator body and the guide rod may be implemented as a rod in the relationship between the guide block and the guide rod. Such a guide device is also included in the actuator with rod according to the present invention as long as the guide device itself does not have a driving source and is moved following another moving body.
In the case of the guide device, an effect is obtained that the bush, the ball bearing, and the like provided on the guide block can be protected from foreign substances such as spatters.

A plurality of external scrapers 22 and the like may be provided, or the above embodiments may be combined as appropriate. -Although the thing which fixes the external scraper 22 etc. to the cylinder case 2 was illustrated, you may apply to the thing which fixes the external scraper 22 etc. to the rod cover 6. Further, other fixing structures may be employed. Further, although the mounting holes 24 are formed as mounting portions in the external scraper 22 and the like, the mounting portions to the cylinder case 2 may be configured by another structure such as providing a projection.

Although the description has been made on the removal of foreign matter such as spatter scraped off by the external scraper 22 or the like or the internal coil scraper 20 by air blowing,
An air passage may be provided between the fluid pressure cylinder 1 and the external scraper 22 or the like itself, or the external scraper 22 or the like, in order to enhance the effect of blowing off foreign matter by blowing the air.

Although the case in which the outer shape of the cylinder case 2 has a square shape has been described as an example, the present invention may be applied to a cylindrical shape or another shape. Means other than the claims grasped by the embodiments described above and the effects thereof are enumerated below as necessary.

(1) The external scraper is made of a metal material containing at least copper. By containing copper as described above, the thermal conductivity is high, the possibility that high-temperature spatter adheres to the external scraper is low, and the scraping effect can be maintained for a long time. In particular, copper alloys,
Among them, chromium copper is excellent in abrasion resistance and can suppress a reduction in the scraping effect of the external scraper due to abrasion.

(2) The external scraper has a plate shape and is formed in the same shape and the same size as the rod projecting surface of the actuator body. Accordingly, the amount of protrusion of the external scraper from the actuator body to the rod projecting side and the direction intersecting with the rod can be suppressed, and a compact actuator with a rod can be obtained. In addition, it is possible to prevent a situation in which the stepped portion between the actuator main body and the external scraper is eliminated, and a foreign matter such as spatter adheres to a boundary portion between the actuator body and the external scraper, whereby the external scraper cannot be removed.

(3) The plurality of scrapers are spaced apart in the axial direction of the rod. Thus, foreign matter removal from the outer peripheral surface of the rod can be performed in a plurality of stages. Further, it is preferable that the scrapers are separated from each other to ensure smooth movement of the rod.

(4) On the rod cover of the fluid pressure cylinder,
Forming a plurality of accommodation grooves at intervals in the axial direction of the rod,
An annular scraper pressed into contact with the rod is accommodated in each accommodation groove, and the outer diameter of each scraper is set to the groove of the accommodation groove so that each scraper is allowed to move in a direction crossing the rod in each accommodation groove. It was formed smaller than the diameter.

(5) The outer scraper is formed by forming a rod insertion hole by bending the outer scraper in a tapered shape toward the rod tip side while being radially split from the center.
The bent portion is provided with a spring force in a direction in which it is pressed against the outer peripheral surface of the rod. As a result, the external scraper comes into pressure contact with the rod surface, and the effect of scraping foreign matter by the external scraper is improved. In addition, the space formed by the split functions effectively when foreign matter is removed by blowing air.

(6) A rod insertion hole into which the rod is loosely inserted is formed in the external scraper, an accommodation groove is formed in the inner peripheral surface of the external scraper corresponding to the rod insertion hole, and the accommodation groove is pressed against the rod. Accommodated annular scraper,
The outer diameter of the scraper is formed smaller than the groove diameter of the accommodation groove so that the scraper is allowed to move in the direction intersecting the rod in the accommodation groove.

(7) The rod is one working member of the welding device. This makes it possible to reliably remove spatter that jumps out of the welding site. In particular, it is most suitable for use in arc welding in which the spatter has a high temperature and a large particle diameter.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a fluid pressure cylinder according to a first embodiment.

FIG. 2 is a perspective view showing an external scraper disassembled from a fluid pressure cylinder.

FIG. 3 is a perspective view showing a coil scraper.

FIG. 4 is a partially cutaway front view showing a cylinder mounting state according to the second embodiment.

FIG. 5 is a partial sectional view showing a fluid pressure cylinder according to a third embodiment.

FIG. 6 is a perspective view showing a fluid pressure cylinder according to a fourth embodiment.

FIG. 7 is a sectional view showing a part of a hydraulic cylinder according to a fifth embodiment.

FIG. 8 is a sectional view showing a part of a fluid pressure cylinder according to a sixth embodiment.

FIG. 9 is a sectional view showing a part of a hydraulic cylinder according to a seventh embodiment.

FIG. 10 is a sectional view showing a part of a hydraulic cylinder according to an eighth embodiment.

[Explanation of symbols]

1 .... a fluid pressure cylinder as an actuator with rod
2. Cylinder case as actuator body, 2a
... Through holes as mounting holes, 6 ... Rod covers, 11 ... Pistons, 15 ... Rods as piston rods, 18 ...
Rod packing, 21 ... Coil scraper as internal scraper, 22, 35, 38, 43 ... External scraper, 23 ... Rod insertion hole, 24 ... Mounting hole as mounting part, 25 ... Bolt as fixing member, 36 ... Taper surface ,
46, 47... A first support plate and a second support plate constituting an external scraper.

Claims (12)

[Claims] 1. An actuator with a rod including a rod that can move forward and backward with respect to the actuator body, wherein a plurality of scrapers that scrape foreign matter attached to the outer peripheral surface of the rod are arranged in parallel in the axial direction of the rod. 2. An actuator with a rod having a rod which can move forward and backward with respect to an actuator body, wherein an external scraper is provided for scraping foreign matter adhered to the outer peripheral surface of the rod, and a rod insertion hole through which the rod is inserted is formed in the external scraper. An actuator with a rod, wherein the external scraper is attached to a rod projecting surface of an actuator body in a state where the rod is inserted through the rod insertion hole. 3. An actuator with a rod, comprising: a rod capable of moving back and forth with respect to the actuator body; and an internal scraper inside the actuator body for scraping foreign matter adhered to the outer peripheral surface of the rod. A rod insertion hole through which a rod is inserted into the external scraper, and the external scraper attached to a rod projecting surface of the actuator body with the rod inserted through the rod insertion hole. Actuator. 4. The actuator with a rod according to claim 2, wherein the external scraper is detachably attached to the actuator body. 5. The actuator with a rod according to claim 2, wherein the external scraper is formed in a flat plate shape. 6. The rod-equipped actuator according to claim 2, wherein the external scraper is formed in a tapered shape with the rod insertion hole portion as a vertex projecting toward the rod tip. 7. The actuator body and the external scraper are provided with mounting holes at positions corresponding to each other, and are fixed by inserting a rod-shaped fixing member. The mounting hole of the external scraper is formed outside the fixing member. The actuator with a rod according to any one of claims 2 to 6, wherein the actuator is formed to be larger than the diameter. 8. The rod-equipped actuator according to claim 2, wherein the rod insertion hole of the external scraper is formed so as to have a slight gap with the rod outer peripheral surface. 9. The rod according to claim 1, wherein the actuator body is a cylinder body, and the rod is a piston rod that moves based on a fluid pressure acting on a piston housed in the cylinder body. With actuator. 10. A cylinder body is provided with a rod cover through which a piston rod is inserted, and the rod cover is provided with a piston packing which is slidably contacted with the piston rod. The actuator with a rod according to claim 9, wherein the scraper is disposed on a side opposite to the piston. 11. An external scraper attached to an actuator main body for scraping foreign matter attached to a rod driven forward and backward with respect to the actuator main body, wherein the rod insertion hole through which the rod is inserted, and an attachment portion to the actuator main body. And an external scraper with. 12. The external scraper according to claim 11, wherein the mounting portion is a plurality of mounting holes respectively corresponding to the plurality of mounting holes formed in the actuator body.