JPH02118202A - Branch circuit unit - Google Patents

Abstract

PURPOSE:To facilitate assembling and reduce the size of a pipe line by laminating and connecting an upper cover, a plate-like seal member and a lower cover with each other, and forming a branch flow passage to be sealed by means of the upper and lower covers on the seal member. CONSTITUTION:A branch circuit unit is composed of an upper cover 1, a seal member 2 and a lower cover 3 which are layeredly connected with each other by fastening a screw 6 inserted from an inserting hole 4 into a screw hole 5, whereby sealability between respective layers is maintained. A branch flow passage 8 which is sealed by the upper and lower covers 1 and 3 is formed on the seal member 2, while a pair of branches 10', 10'' are communicated with both ends of an inflow passage 9. Branches 12', 12'' are communicated with Venturi pipe passages 11', 11'' in way of the inflow passage 9. Each of branches 10', 10'' is adjusted in its width of flow passage by a variable throttle valve 3. It is thus possible to facilitate assembling of a branch circuit and reduce the size of pipe line, in an abnormality detecting device, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a layered branch circuit unit incorporated into a hydraulic circuit or a pneumatic circuit.

[Conventional technology]

Generally, machine tools such as machining centers are equipped with a detection device that detects wear and breakage of tools used to process workpieces, and when the detection device detects an abnormality in the tool,
A warning is issued or the machine tool is stopped.

FIG. 9 shows an example of an abnormality detection device for a drill set on the main shaft of a machining center. This abnormality detection device is
A pressure reducing valve 42 is connected to the air supply pipe 41 connected to the air pressure R40, and two branch pipes 4 are connected to the fluid outlet side of the pressure reducing valve 42.
A variable throttle valve 44 and a venturi pipe 45 are connected in order to each branch pipe 43' and 43", and the fluid outlet side of the venturi pipe 45 of one of the branch pipes 43' is connected to the venturi pipe 45. A detection valve 46 is connected, and a drill wear detection valve 47 is connected to the fluid outflow side of the Venturi pipe 45 of the other branch pipe 43''.

The cutting blockage detection valve 46 is installed between a cylindrical body connected to the main shaft of a machine tool and a tool mounting shaft supported by the cylindrical body via a drill link, and is installed between the cylinder body and the tool mounting shaft. The branch pipe 43' is closed by rotation.

Further, the drill wear detection valve 47 is installed between the cylindrical body and a tool mounting shaft supported by the cylindrical body via a thrust limiter, and is configured to detect the wear detection valve 47 by the relative axial movement of the cylindrical body and the tool mounting shaft. The branch pipe 43'' is closed.

When each of these detection valves 46, 47 closes the branch pipe 43', 43", the pressure inside each branch pipe 43', 43" increases, so a pressure switch 48 is connected to the Venturi pipe 45,
When the pressure switch 48 detects a pressure fluctuation within the branch pipes 43', 43'', the machine tool is stopped or an alarm is generated.

[Problem to be solved by the invention]

When assembling the branch circuit A surrounded by the dashed line of the abnormality detection device as described above, conventionally, as shown in Fig. 1O,
A variable throttle valve 44 and a venturi pipe 45 are connected to a piping line in which a plurality of straight pipes 50 are connected with pipe joints 51 such as elbows, teeth, nipples, etc.
Since the pressure switch 48 is connected to the pressure switch 48, it takes a lot of effort to assemble and has the disadvantage of increasing the size.

Therefore, the present invention aims to provide a layered branch circuit unit that can eliminate the above-mentioned disadvantages, simplify the assembly of the branch circuit, and reduce the size of the entire conduit. This is an issue.

[Means to solve the problem]

In order to solve the above problems, in the present invention, an upper cover, a plate-shaped sealing member, and a lower cover are stacked and connected to each other, and the sealing member includes a branch that is sealed by the upper cover and the lower cover. A configuration is adopted in which a flow passage is formed, and at least one of the upper cover and the lower cover is provided with a fluid inlet, a fluid outlet, and a device connection hole that communicate with the branch flow passage.

[Operation] The branch circuit unit having the above configuration connects a pipe to a fluid inlet and a fluid outlet, and causes the fluid supplied to the fluid inlet to flow out from the fluid outlet through the branch flow passage. Further, a device such as a pressure switch is connected to the device connection hole, and the device is operated by fluctuations in fluid pressure in the branch flow path. Since the flow passage formed in the seal member can be formed by molding and punching, even a complicatedly shaped branch flow passage can be easily formed.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 8.

For example, a layered branch circuit unit forming a branch circuit A in a portion surrounded by a dashed-dotted line of the abnormality detection device shown in FIG. 9 will be explained as an example. As shown in FIGS. 1 to 3, the branch circuit unit according to the present invention has a three-layer structure including an upper lid 1, a plate-shaped sealing member 2, and a lower lid 3, and has four corners of the upper lid 1 and the sealing member 2. An insertion hole 4 is formed in the lower cover 3, and a screw hole 5 is formed in the lower cover 3 opposite to the insertion hole 4.
is provided.

The upper lid 1, the seal member 2, and the lower M3 are combined in a stacked state by tightening a screw 6 that is screwed into the screw hole 5 from the insertion hole 4. In the combined state, upper M1 and seal member 2
The opposing surfaces of the sealing member 2 and the lower lid 3 are in close contact with each other over the entire surface, and the sealing performance between the layers is maintained. In order to improve the sealing performance, the sealing member 2 is preferably made of synthetic resin.

In addition, in FIG. 3, a spacer 7 is incorporated into the insertion hole 4 of the seal member 2, and the spacer 7 prevents the seal member 2 from being deformed more than necessary due to the tightening of the screw 6, thereby improving sealing performance. The effective cross-sectional area of the road is maintained.

A branch flow passage 8 is formed in the seal member 2 and is sealed by the upper lid 1 and the lower M3. This branch flow passage 8 is constructed by connecting a pair of branch passages 10'10'' to both ends of the inflow passage S, and a venturi pipe 11', 11'' is formed in the middle of each branch passage 10'10''. branch pipes 12', 12'' are connected to the venturi pipes 11', 11''.
is provided.

The size of each of the branch passages 10' and 10'' is adjusted by a variable throttle valve 13. The variable throttle valve 13 shown in FIGS. 1 and 2 is made of a plate with a chevron-shaped tip. The plate body is slidably assembled into a valve mounting hole 14 communicating with the branch passage 10'10'', and is fixed by tightening a set screw 15 screwed into the upper M1.

Note that instead of the set screw 15, as shown in FIG.
A plurality of engagement holes 16 are formed on the upper surface of the variable throttle valve 13, and an axial hole 18 for an adjustment screw 17 screwed into the upper cover 1 is formed.
The variable throttle valve 13 may be fixed at the adjusted position by incorporating a ball 19 and a spring 20 that presses the ball 19 against the upper surface of the variable throttle valve 13, and by the engagement of the ball 19 with the engagement hole 16.

The variable throttle valve 13 shown in FIG. 6 consists of a screw shaft, which is screwed into a screw hole 21 formed in the top cover 1, and is fixed at the adjusted position by tightening a lock nut 22.

The upper lid 1 includes a fluid passage 23 communicating with the branch flow passage 8.
and a fluid outlet 24' communicating with each branch passage 10', 10''.
, 24'' are formed on the upper lid 1.
2' and 12'' are formed, and a pressure cage inch 26 is installed in the device connection hole 25. In FIG.
A screw hole 27 is formed in the upper part of the pressure switch 26, and a mounting leg 28 of the pressure switch 26 is screwed into the screw hole 27.

Further, in FIG. 8, a recess 29 is formed in the upper part of the device connection hole 25, the pressure switch 26 is housed in the recess 29, and the pressure switch 26 is prevented from being removed by caulking the opening of the upper recess 29. .

Here, the pressure switch 26 is connected to a cover 3 made of an insulator.
0 and a valve seat 31 made of a conductor form a switch case 32, a diaphragm 33 is stretched inside the switch case 32, a front chamber 34 and a rear chamber 35 are provided in the case, and the valve seat 31 has branches. A hole 36 communicating with the passages 12' and 12'' is formed in the diaphragm 33 by pressure fluctuations of the fluid flowing into the front chamber 34 from the hole 36 and the elasticity of a spring 37 incorporated in the rear chamber 35. Contact 3
8 is brought into contact with and separated from the opening edge of the hole 36.

When using the pressure switch 26 as described above, the upper M1
is formed of a conductor, and an electric circuit is formed between M1 and a terminal 38 attached to the cover 30.

The branch circuit unit shown in the example has the above structure,
When a fluid supply pipe is connected to the fluid port 23 of the circuit unit and a fluid discharge pipe is connected to the fluid outlet 24', 24'' to supply fluid to the fluid port 23, the fluid flows through the flow path 8 and the variable throttle Valve 13 and venturi line 11', 1
1'' reduces the flow rate and flows from the ends of the branches 10', 10'' to the fluid outlets 24', 24''.

When the fluid flows as described above, the fluid outlet 24',
When a pressure fluctuation occurs on the 24'' side, the pressure acts on the device connection hole 25 through the branches 12' and 12'', so that the pressure switch 26 is activated.

In the case of the embodiment, the branch circuit unit used in the branch circuit of the abnormality detection device shown in FIG. 9 was explained as an example.
The shape of the branch flow passage 8 formed in the sealing member 2 should be an appropriate shape according to the fluid circuit in various devices. Here, the branch flow passage 8 may be formed by molding or punching a synthetic resin. Therefore, even complex-shaped flow passages can be formed extremely easily.

In addition, in the case of the embodiment, the fluid port 23, the fluid outlets 24', 24'', and the device connection hole 25 were formed in the upper lid 1.
The various holes described above may be formed in the lower M3. Furthermore, the purpose can be achieved even if the sealing member 2 and the lower M3 are integrally molded.

〔Effect of the invention〕

As described above, in the present invention, a branch flow passage is formed in the sheet member sandwiched between the upper cover and the lower cover, and a fluid inlet and a fluid outlet communicating with the branch flow passage are provided in at least one of the upper cover and the lower cover. Since the device connection hole is formed, it is possible to facilitate assembly of a branch circuit in an abnormality detection device, etc., and since the fluid circuit unit is layered, the piping path can be downsized.

Moreover, since the flow path formed in the sheet member can be formed by molding or punching, even a flow path with a complicated shape can be formed very easily.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional plan view of a branch circuit unit according to the present invention, FIG. 2 is an exploded perspective view of the same, and FIG. 3 is an upper cover of the same;
FIG. 4 is a cross-sectional view showing a locking portion of the variable throttle valve same as above; FIG. 5 is a cross-sectional view showing another example of the locking portion same as above; FIG. 6 7 is a sectional view showing another example of the variable throttle valve same as the above, FIG. 7 is a sectional view of the mounting part of the pressure switch same as the above, FIG. FIG. 9 is a circuit diagram of the abnormality detection device, and FIG. 10 is a conventional piping diagram in a branch circuit of the same circuit diagram. 1...Top lid, 2...Seal member, 3...Bottom cover, 8...
...Flow path, 23...Fluid inlet, 24', 24''...Fluid outlet, 25...
・Equipment connection hole. Patent applicant: Japan Pneumatic Industry Co., Ltd. Agent: Kama 1) Text Figure 10

Claims (1)

[Claims] (1) The upper cover, the plate-shaped seal member, and the lower cover are each stacked and connected to each other, and the seal member has a branch flow passage sealed by the upper cover and the lower cover, and the upper cover and the lower cover are connected together. a fluid inlet communicating with the branch flow passageway on at least one side;
Branch circuit unit with fluid outlet and equipment connection holes.