JP3034293U - Air cylinder - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a clean air cylinder by preventing dust generated by sliding of a cylinder rod from scattering to the outside and polluting the external environment. SOLUTION: In an air cylinder, a dust collecting pocket is provided outside a rod cover 5, and dust is sucked and removed through an exhaust port 3 communicating with the dust collecting pocket. This can provide a clean air cylinder.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 This proposal relates to an air cylinder used in an environment where a high level of cleanliness is required.

[0002]

2. Description of the Related Art Countermeasures for dust generation in air cylinders are two aspects: low dust generation by selecting lubricating grease, which is the main source, and how to eliminate the dust before it diffuses into the clean room. Take measures from. For the former, low dust generation fluorine grease is used in place of lithium soap grease used as a lubricant for normal environment (hereinafter called normal type) air cylinders. The latter has been devised in terms of structure, and the structure is roughly classified into two types. A conventional example will be described below. In [Type 1] (shown in Fig. 3), the cylinder cover 5 is provided with packing 1A and packing 1B, and a dust collecting area 2 is provided between them. A dust exhaust port 3 is arranged in the dust collecting area 2 to remove air containing dust leaking from the cylinder chamber 7B to the outside through the exhaust pipe 14. The exhaust gas in this case is natural exhaust gas with no atmospheric pressure difference between the dust collecting area 2 and the end of the exhaust pipe 14. [Type 2] (shown in FIG. 4) is designed to prevent dust from being forced out by sucking dust from the waste dust port 3 using the ejector 15 etc. with the packing 1B removed. It is.

[0003]

[Problems to be Solved by the Invention] However, in the conventional mechanism, the sliding portion b of the dust source is interposed between the dust collecting port 3 and the outside air. Dust generated by sliding increases and scatters as the operating speed of the cylinder rod 6 accelerates, and pollutes the external environment. In addition to the same problems as the above [Type 1], the [Type 2] technology also cuts off the grease due to negative pressure due to suction because the sliding part b blocks the outside air. Had a problem. Therefore, the present invention solves such a problem, and the purpose of the present invention is to provide a dustproof property for less than 1 piece / 1,000 cycles (0.1 μm), and the type of grease used. We are offering clean air cylinders that can be used in any

[0004]

[Means for Solving the Problems]

 The air cylinder of the present invention is characterized in that a dust collecting pocket is provided on the outside of the rod cover, and dust is sucked and removed through an exhaust port communicating with the dust collecting pocket.

Further, the present invention is characterized in that the type of lubricating grease that is the main cause of dust generation in the air cylinder does not matter.

[0006] In addition, the feature is to add the function to the rod cover body of the air cylinder.

[0007]

[Embodiment of the invention]

 [First Embodiment] An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of the present invention. In the figure, the part excluding the dust collecting cover 10 is a normal type air cylinder. The cylinder 11 has a columnar shape, and the outer periphery thereof is in contact with the inner peripheral surface of the cylinder tube 12 and slides. The cylinders are connected to each other with the same central axis as the cylinder rod 6, and work together along the central axis. A rod cover 5 is internally fixed to one end of the cylinder tube 12 in the protruding direction of the rod, and is hermetically sealed by a packing 1C. Further, the rod cover 5 is formed with a hole through which the piston rod 6 penetrates, and a packing 1A is attached to keep the cylinder chamber 7B airtight. A cylinder cover 13 is fixed to the other end of the cylinder tube 12 and is similarly airtight with a packing 1C. . Therefore, the airtightness between the cylinder chambers 7A and 7B and the outside air is ensured when the cylinder is stopped. Therefore, there is no dust emission to the outside. During operation, dust generated by reciprocating motion of the cylinder rod 6 due to compressed air alternately supplied to the cylinder chambers 7A, 7B through the air supply / exhaust ports 8A, 8B under the control of the solenoid valve 16 is generated. It reaches the dust collecting pocket 9 through the sliding portions a and b of the rod cover 10 and the packing 1A between them. The dust collection port 9 communicates with the dust collection pocket 9. The dust suction port 3 and the ejector 15 are connected by the exhaust pipe 14 and are constantly sucked by the ejector 15. At the same time, the outside air in the vicinity is passed through the outside air release part d formed by the dust collection pocket 9 and the cylinder rod 6 and provided so as not to interpose a sliding part as a dust source between the dust collection pocket and the outside air. Aspirate in the direction of arrow c. Therefore, dust generated from the air cylinder is not diffused to the outside air but is removed to the outside of the room through the dust collection port 3 and does not pollute the clean environment.

[Second Embodiment] Although the mechanism of dust removal is the same as that of the first embodiment (FIG. 1) described above, the dust removal function is incorporated in the rod cover 5 as shown in FIG. It is an air cylinder that is easy to use.

[Effects of the Embodiment] Table 1 shows the dust generation amount measurement data per operation cycle of four air cylinders for each type.

[0010]

[Table 1]

DATA1 is a measured value according to the first embodiment of the present invention (first embodiment) (average of 6 times × 1,000 cycles) DATA2 is a measured value before the present invention (first embodiment) DATA3 is a conventional example Measured value of 1 DATA 4 is the measured value of Conventional Example 1.

The number of dust particles indicates a numerical value that is equal to or larger than the particle size shown and is equal to or smaller than the size in the right column. For example, the numerical value of each DATA in the 0.1 μm column is the number of sizes of 0.1 μm or more and less than 0.2 μm. Therefore, the total number of dust particles of 0.1 μm or more in the first embodiment of the present invention is 0.2 + 0.3 + 0.5 = 1. Therefore, the cleanliness class 1 specified in JIS B 9920 is defined as 10 or less dust particles of 0.1 μm or more in 1 cubic meter of air, which is 10> 0.016 (Note 1), which is Class 1 Have cleared the standard with a margin. Therefore, it can be said that most of the dust generated by the operation of the air cylinder is removed by suction and does not pollute the external environment. This result proves that regardless of the type of grease, it is possible to clean by using an inexpensive ordinary cylinder.

(Note 1) Conversion of total dust generation to cleanliness class Clean room filter conditions Blowout part size 0.6 m × 0. 6m Flow velocity 0.3m / sec Operating condition of air cylinder Operating speed 500mm / sec Operating distance 300mm / cycle Operating air pressure 0.5MPa Continuous operation Calculated as 1,000 cycles Time required for 1,000 cycles 300 (mm) / 500 (mm / sec) × 1,000 = 600 (sec) Total amount of clean air discharged from the filter during 600 (sec) is 0.6 (m) × 0.6 (m) × 0.3 (m / sec) × 600 (sec) = 64.8 ( Cubic meters). Based on the above calculation, assuming that the air cylinder was operated for 1,000 cycles under a filter of 0.6 m square, there was only one dust emission of 0.1 μm or more in 64.8 cubic meters. In addition, 0.016 pieces, which is the value obtained by dividing one piece by 64.8, are emitted in one cubic meter. Therefore, as compared with D ATA1 and DATA 2 in Table 1, the dust generated by the operation of the air cylinder is almost eliminated by suction and does not pollute the external environment. Further, Fig. 5 is a graph and visualization of the data in Table 1, but the superiority of the present invention is clear. This result proves that regardless of the type of grease, it is possible to clean by using an inexpensive ordinary cylinder.

[0014]

[Effect of the invention]

 Since there is no dust generation point between the dust collection pocket 9 and the external environment, suctioning the dust collection port 3 causes the dust collection pocket 9 to become a negative pressure in the direction of arrow c from the gap between the dust collection cover 10 and the cylinder rod 6. Outside air does not enter and does not leak dust to the outside. Therefore, dust generation can be suppressed to the levels shown in the previous section. Moreover, it is not necessary to select the type of lubricating grease because the dust inside the air cylinder is completely eliminated. Therefore, it is possible to achieve a high level of cleaning by using an inexpensive normal type air cylinder.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional example [type 1].

FIG. 4 is a configuration diagram of a conventional example [type 2].

[Explanation of symbols]

 1A is packing A 1B is packing B 1C is packing C 2 is dust collecting area 3 is waste dust port 4A is fluorine-based grease 4B is lithium-based grease 5 is rod cover 6 is cylinder rod 7A is cylinder chamber A 7B is cylinder chamber B 8A is a supply / exhaust port A 8B is a supply / exhaust port B 9 is a dust collection pocket 10 is a dust collection cover 11 is a cylinder 12 is a cylinder tube 13 is a cylinder cover 14 is an exhaust pipe 15 is an ejector 16 is a solenoid valve a is a sliding part. a b is a sliding portion b c is a suction flow direction d is an outside air opening portion

Claims (3)

[Utility model registration claims] 1. An air cylinder in which a dust collecting pocket is provided outside a rod cover, and dust is sucked and removed through an exhaust port communicating with the dust collecting pocket. 2. The air cylinder according to claim 1, wherein the type of lubricating grease that is the main cause of dust generation in the air cylinder does not matter. 3. The air cylinder according to claim 1, wherein the rod cover body of the air cylinder is provided with the function.