JP4044588B2 - Cylinder mounting structure and cylinder - Google Patents

Description

The present invention relates to a mounting structure for a rod-type cylinder that outputs a reciprocating linear motion using a fluid pressure of a working fluid as a drive source, and in particular, enables a work unit to be designed compactly.

  For example, a pneumatic cylinder using air pressure as a driving source has been conventionally used in various apparatuses, and has been used as an actuator in a transport apparatus, a positioning apparatus, and the like. FIG. 4 is a cross-sectional view showing a conventional general pneumatic cylinder. In this pneumatic cylinder 100, a piston 105 sliding inside the cylinder tube 101 is provided in a cylinder body 104 in which a rod cover 102 and a head cover 103 are fitted into a cylindrical cylinder tube 101, and is fixed to the piston 105. The piston rod 106 is protruded from the rod cover 102. A pair of airtight pressurizing chambers 111 and 112 are formed in the cylinder body 104 with the piston 105 interposed therebetween, and ports 121 and 122 communicating with the pressurizing chambers 111 and 112 are provided in the rod cover 102 and the head cover 103, respectively. Is formed. The ports 121 and 122 are internally threaded, and are connected to an air tube having a solenoid valve or the like connected to a screwed joint (not shown).

No. 1-40326 JP 2000-356204 A

  However, the conventional cylinder such as the pneumatic cylinder 100 is directly connected to the fluid pipe for sending the working fluid, so that even if the width of the cylinder itself is small, the cylinder protrudes from the cylinder body 104 when the cylinder is mounted. It was necessary to secure a space for the fluid pipe. Therefore, for example, in the case where the suction unit for sucking and holding an object to be transported such as a transport device is configured with a cylinder as a driving means, the suction unit secures a mounting space in consideration of the connection of the air tube to the cylinder. Due to the necessity, there is a problem that the whole unit becomes large particularly in a small-diameter pneumatic cylinder.

Then, an object of this invention is to provide the attachment structure of the cylinder for making a work unit compact.

According to a first aspect of the present invention, there is provided a cylinder mounting structure in which a cylinder that outputs a reciprocating linear motion as a piston slides in a cylinder body and a piston rod fixed to the piston expands and contracts is formed in a block. A cylinder mounting structure that is inserted into a hole , wherein the block is a bottomed hole in which the loading hole opens on one side, an insertion hole through which a fixing screw that fixes the cylinder is inserted, and the loading hole is from the opening sides and opposing sides are provided through the bottom of the loading aperture, said cylinder, a screw hole screwed pre Symbol fixed screw which is inserted into the insertion hole, before Symbol cylinder is formed on the end face opposite the end face projecting said cylinder rod body, the outermost diameter portion of said cylinder body is the same as the inner diameter of the loading aperture, said piston Said cylinder body input and output holes for inputting and outputting working fluid, provided in the cylinder outermost diameter circumferential air groove formed on the side surface of the body, positioned on both sides of this the air groove for pressurizing A seal groove into which a seal ring for preventing fluid leakage is loaded is formed on the side surface of the outermost diameter portion .

In the cylinder mounting structure according to claim 2, the cylinder body has a cylindrical shape, and the piston includes a first pressurizing chamber and a second pressurizing chamber, and the input / output hole, the air groove, it characterized in that said sealing groove is provided in two positions corresponding to said second pressure chamber and the first pressure chamber.
A cylinder according to a third aspect is used in the cylinder mounting structure according to the first or second aspect.

Therefore, according to the present invention, by inserting the cylinder into the loading hole of the unit block, the positioned cylinder has the air groove communicating with the input / output port of the unit block, and the seal ring loaded in the sealing groove has the hole. It is in an airtight state in contact with the wall and sealed from both sides. Therefore, if the working fluid is supplied and discharged through the input / output port of the unit block, the piston is pressurized by the working fluid flowing from the input / output hole through the air groove into the cylinder body, and the piston rod is expanded and contracted. The working unit is driven by
Therefore, it is not necessary to consider the space of the fluid pipe by connecting the fluid pipe for inputting / outputting the working fluid directly to the cylinder without connecting it to the unit block to which the cylinder is attached, thereby making the work unit compact. Can do.

  The present invention provides an input / output hole for inputting / outputting a working fluid for pressurizing a piston in a circumferential air groove formed on a side surface of a cylinder body, and a seal for preventing fluid leakage on both sides of the air groove. By using a cylinder in which a seal groove for loading a ring is formed, a compact work unit can be provided.

  Next, an embodiment of a cylinder and a work unit according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a cylinder, and FIG. 2 is a cross-sectional view thereof. The cylinder of this embodiment is a so-called slim cylinder 10 of a thin rod type as shown in FIG. 1, and is a small pneumatic cylinder driven by air. By the way, even if the cylinder itself is small, the space for the fluid pipe is a space required for the cylinder, and the significance of downsizing the cylinder is lost. Therefore, in the slim cylinder 10 of the present embodiment, the cylinder is configured such that the fluid pipe is not directly connected to the cylinder.

  The slim cylinder 10 has a rod cover 2 and a head cover 3 attached to an open end of a pipe-like cylinder tube 1, and a cylinder body 5 having an airtight space in which a piston 6 slides is formed in the cylinder tube 1. Yes. A piston rod 7 for outputting the reciprocating motion is integrally fixed to the piston 6, and is provided through the rod cover 2. Further, the guide cover 4 fixed to the distal end side of the rod cover 2 is connected to the piston rod. 7 penetrates. A seal ring 11 for preventing air leakage is fitted between the rod cover 2 and the guide cover 4, and a bush 12 on which the piston rod 7 slides is fixed to the inner periphery of the guide cover 4.

  In the airtight cylinder body 5, pressurizing chambers 17 and 18 are formed with the piston 6 interposed therebetween, and input / output holes 21 and 22 for feeding air into the chambers are formed in the rod cover 2 and the guide cover 4. ing. The input / output holes 21 and 22 are formed so as to be connected to the pressurizing chambers 17 and 18 through the gap between the piston rod 7 and the rod cover 2 and the flow path 19 of the head cover 3. Such input / output holes 21 and 22 are disposed in air grooves 23 and 24 formed in the rod cover 2 and the head cover 3. The piston rod 7 and the rod cover 2 are formed with seal grooves 25, 25, 26, and 26 for loading seal rings for preventing air leakage on both sides of the air grooves 23 and 24, respectively.

And such a slim cylinder 10 is integrated in the adsorption | suction unit which comprises a conveying apparatus, for example, as shown in FIG.
The suction unit 30 is configured by integrating the slim cylinder 10 and the buffer 40 in a unit block 31. The unit block 31 is a block body having a predetermined thickness, and a loading hole 33 for inserting and loading the slim cylinder 10 in the longitudinal direction and a through hole 34 for constituting the buffer 40 are drilled in parallel. It is installed.

  As shown in the figure, the slim cylinder 10 is inserted into the loading hole 33 of the unit block 31 with the piston rod 7 protruding upward, and is screwed into a screw hole 27 (see FIG. 2) formed in the head cover 3. To be fixed to the unit block 31. Ports 37 and 38 are formed in the unit block 31 corresponding to the slim cylinder 10 thus positioned, and communicate with the air grooves 23 and 24 through a flow path having the same width.

  Next, the buffer 40 is a buffer mechanism using a magnetic spring. In the buffer 40, a stopper 42 is fixed to one end of an output rod 41 inserted through the through hole 34, and the stopper 42 is supported from below by a hooking block 43 fixed to the piston rod 7. A cylindrical magnet 45 is attached to the output rod 41 at a reduced diameter portion on the way, and a cylindrical magnet 46 is attached to the inner peripheral surface of the through hole 34. Magnets (permanent magnets) 45 and 46 provided in the output rod 41 and the through hole 34 are provided to repel the axial displacement of the output rod 41, and exhibit a spring function like a coil spring. Is.

  The magnets 45 and 46 have the same length in the axial direction and are not shown in detail. However, the magnets 45 and 46 are divided into four in the circumferential direction, and the N pole and the S pole are formed in a band shape with a width of 90 degrees. It is composed of an N pole zone and an S pole zone. For this reason, the magnets 45 and 46 are designed so that different magnetic poles attract each other and face each other alternately, and conversely, the adjacent magnetic poles repel each other and function as a detent. The magnets 45 and 46 are configured such that the output rod 41 and the magnet 45 slide on bushes 47 and 47 fixed to both ends of the magnet 46 so as not to contact each other. A suction pad 50 is attached to the tip of the output rod 41 so as to suck and hold an object (not shown).

  Next, the operation of the suction unit 30 including the slim cylinder 10 will be described below. When the slim cylinder 10 is contracted as shown in FIG. 3, the suction unit 30 is brought into a state where the output rod 31, which is no longer restricted by the hooking block 43, is lowered and the magnets 45 and 46 are attracted to each other. At this time, the output rod 31 is located at the lower limit value of the stroke, and protrudes greatly downward from the unit block 31. In this state, the suction unit 30 is sent by a robot hand (not shown) or the like, and the suction pad 50 is pressed downward against a transported object or the like placed at a predetermined position.

  At this time, the output rod 31 which is free in the direction of the pressing reaction force (upward in the drawing) is pushed up and moved in the same direction. At this time, the magnets 45 and 46 which are shifted from the stable state in FIG. A suction force acts on the lower side of the drawing to pull back the rod 31. The buffer 40 exerts a spring force by the magnets 45 and 46 as in the case of the coil spring and the like, and the suction pad 50 is pressed against the object to be transported by the spring force. Therefore, even if the suction pad 50 is pressed against the object to be conveyed by the movement of the robot hand, the force of the robot hand is not the pressing force of the suction pad 50 and is buffered by the magnet 45.46. Furthermore, since the magnetic forces of the magnets 45 and 46 are constant regardless of the amount of axial displacement, even if the stroke of the output rod 31 is increased when the suction pad 50 is pressed, it does not exceed a fixed pressing force.

On the other hand, the height of the output rod 31 can be adjusted by the slim cylinder 10, and as described above, the movement of the output rod 31 becomes free when the slim cylinder 10 is contracted, and the output rod 31 is pulled up as it extends.
Although not shown, the slim cylinder 10 using air as a working fluid is connected to an air tube via a joint attached to each port 37, 38 of the unit block 31, and is connected to an air pump or the atmosphere release side by a switching valve. ing.

Therefore, when air is supplied from the port 38 of the unit block 31 in a contracted state as shown in the figure, the air flows into the air groove 24 of the slim cylinder 10 and is added from the input / output hole 34 without leaking by the seals on both sides. It flows into the pressure chamber 18. Then, the pressurized piston 6 slides in the cylinder body 5, and the piston rod 7 protrudes upward in FIG.
Conversely, when the piston rod 7 is contracted downward in FIG. 3, air is supplied from the port 37 of the unit block 31. Air flows into the air groove 23 of the slim cylinder 10 and flows into the pressurizing chamber 17 from the input / output hole 33 without leaking by the seals on both sides. When the pressurized piston 6 slides in the cylinder tube 1, the previously supplied air in the opposite pressurizing chamber 18 is pushed out from the input / output hole 34 and passes through the air groove 24 to the port. It exhausts from the 38th side.

  In this way, according to the slim cylinder 10 of this embodiment, since it is not necessary to directly connect the air tube that inputs and outputs the working fluid, the slim cylinder 10 can be accommodated in the loading hole 33 of the unit block 31. did it. Therefore, the suction unit 30 can be designed extremely compactly by integrating the slim cylinder 10 in the unit block 31.

In addition, this invention is not limited to the thing of the said embodiment, A various change is possible in the range which does not deviate from the meaning.
For example, in the above embodiment, the pneumatic cylinder has been described as an example, but a cylinder using oil as a working fluid may be used.
In the above embodiment, the working unit has been described by taking the suction unit as an example. However, the working unit may be a unit that performs other functions.
Further, although a screw is provided at the bottom as a method of fixing the pneumatic cylinder, a method of screwing the cylindrical portion may be used.

It is the side view which showed the slim cylinder. It is sectional drawing which showed the slim cylinder. It is sectional drawing which showed the adsorption | suction unit provided with the slim cylinder. It is sectional drawing which showed the conventional cylinder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder tube 2 Head cover 3 Rod cover 5 Cylinder body 6 Piston 7 Piston rod 10 Slim cylinders 21 and 22 I / O holes 23 and 24 Air grooves 25 and 26 Seal groove 30 Adsorption unit 31 Unit block 33 Loading hole 40 Buffer

Claims (3)

A cylinder mounting structure in which a cylinder that outputs a reciprocating linear motion as a piston slides inside a cylinder body and a piston rod fixed to the piston expands and contracts is inserted into a loading hole formed in a block. And
The block is a bottomed hole in which the loading hole is opened in one side, and the insertion hole through which a fixing screw for fixing the cylinder is inserted extends from the side surface facing the side surface in which the loading hole is opened to the bottom of the loading hole. Is provided to penetrate through,
The cylinder is
The insertion hole is inserted through the pre-Symbol threaded hole screwed a fixed screw, is formed on the end face opposite to the end face cylinder rod protrudes before Symbol cylinder body,
The outermost diameter portion of the cylinder body is the same as the inner diameter of the loading hole;
Input / output holes for inputting / outputting the working fluid that pressurizes the piston are provided in a circumferential air groove formed on the side surface of the outermost diameter portion of the cylinder body, and are located on both sides of the air groove. A cylinder mounting structure in which a seal groove into which a seal ring for preventing fluid leakage is loaded is formed on a side surface of the outermost diameter portion of the cylinder body. A cylinder mounting structure according to claim 1,
The cylinder body has a cylindrical shape, and the piston forms a first pressurizing chamber and a second pressurizing chamber, and the input / output hole, the air groove, and the seal groove are the first pressurizing chamber. And a mounting structure for a cylinder, which is provided at two locations corresponding to the second pressurizing chamber. A cylinder characterized by being used in the cylinder mounting structure according to claim 1 or 2.

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