JP6470137B2 - Bead setter operation control mechanism, operation control method, and tire forming apparatus - Google Patents

Description

  The present invention relates to a bead setter operation control mechanism and operation control method for controlling the reciprocation of a bead setter using an air cylinder, and a tire forming apparatus provided with the bead setter operation control mechanism.

  In the production of a pneumatic tire, conventionally, a primary tire is formed by setting a bead on a cylindrical tire band formed on a former, and a bead setter is used for setting the bead ( For example, Patent Document 1).

  FIG. 3 is a diagram schematically showing the bead setter, where (a) is a plan view and (b) is a front view. As shown in FIG. 3, a pair of air cylinders 1 is attached to the bead setter 2, and the bead setter reciprocates as the rod of the air cylinder 1 expands and contracts to set the beads.

  FIG. 4 is a diagram schematically showing a structure of an air pipe of an operation control mechanism of a conventional bead setter. As shown in FIG. 4, each air cylinder 1 is provided with a head-side air port (pressure chamber) 1a and a rod-side air port 1b. The air pipe for supplying air to the air cylinder 1 includes a solenoid valve 3 for switching supply and discharge of air to and from the air ports 1a and 1b of the air cylinder 1 and a first air pressure for adjusting the air pressure of the rod-side air port 1b. And a second regulator 4B that adjusts the air pressure of the head-side air port 1a.

  In such an air cylinder 1, the rod is expanded and contracted by adjusting the balance of the air amount between the air port 1a on the head side and the air port 1b on the rod side.

  Specifically, when the rod is contracted, air is exhausted from the air port 1a on the head side and air is supplied to the air port 1b on the rod side, and the amount of air in the air port 1b on the rod side is changed to the air port 1a on the head side. The rod is contracted by making it larger than the amount of air in.

  On the other hand, when the rod is extended, air is supplied to the air port 1a on the head side and air is exhausted from the air port 1b on the rod side, and the air amount in the air port 1a on the head side is changed to the air amount in the air port 1b on the rod side. The rod is extended by making more than.

JP 2014-83755 A

  However, in the above-described conventional bead setter, when the rod is expanded and contracted, the rod is expanded and contracted only by adjusting the balance of the air amount under the same air pressure, so the rod expansion and contraction speed is slow and the bead is set quickly. Can not do it. For this reason, there is a possibility of impairing the productivity in the primary molding of the tire, and it has been desired from the aspect of productivity improvement to increase the expansion / contraction speed of the rod.

  Further, from the viewpoint of reducing the manufacturing cost, it has been desired to reduce the amount of air used by reducing the amount of air exhausted to the outside during expansion and contraction of the rod.

  Accordingly, the present invention provides a tire molding technique that can increase productivity by increasing the expansion / contraction speed of the rod of the air cylinder, and that can reduce the amount of air used during expansion / contraction of the rod. Let it be an issue.

  As a result of intensive studies to solve the above problems, the present inventor has found that the above problems can be solved by the invention described below, and has completed the present invention.

The invention described in claim 1
An operation control mechanism for a bead setter that controls the reciprocation of a bead setter that sets a bead on a tire band molded on a former,
An air cylinder having an air port on each of the head side and the rod side, and extending and contracting the rod by a difference in air pressure between each air port generated by supply and exhaust of each air port;
Control means for controlling the air pressure in each of the air ports,
An operation control mechanism for a bead setter characterized in that the control means has a control function of previously depressurizing a rod-side air port when the rod is extended and a head-side air port when the rod is contracted.

The invention described in claim 2
The control means is
A solenoid valve for switching supply and exhaust of air to the air port on the head side and rod side of the air cylinder;
A first power valve and a first electropneumatic regulator for adjusting the pressure of air supplied to the air port on the rod side of the air cylinder;
A second power valve for adjusting a pressure of air supplied to the air port on the head side of the air cylinder and a second electropneumatic regulator;
When the rod is extended, the air port on the rod side of the air cylinder is previously depressurized, and then the solenoid valve is switched to supply air to the air port on the head side and exhaust air from the air port on the rod side. To extend the rod,
When the rod contracts, the air port on the head side of the air cylinder is depressurized in advance, the solenoid valve is switched to supply air to the air port on the rod side, and the air in the air port on the head side is exhausted. 2. The bead setter operation control mechanism according to claim 1, wherein the control is performed such that the rod is contracted.

The invention according to claim 3
A tire forming apparatus comprising the bead setter operation control mechanism according to claim 1.

The invention according to claim 4
An operation control method for a bead setter for controlling a reciprocating operation of a bead setter for setting a bead on a tire band formed on a former,
Using the operation control mechanism of the bead setter according to claim 1 or 2,
When the rod is extended, the air port on the rod side of the air cylinder is depressurized in advance, then air is supplied to the air port on the head side and the rod is extended by exhausting air from the air port on the rod side. ,
When the rod is contracted, the air port on the head side of the air cylinder is depressurized in advance, then air is supplied to the air port on the rod side, and the rod is contracted by exhausting air from the air port on the head side. It is the operation control method of the bead setter characterized by controlling as follows.

  According to the present invention, it is possible to improve productivity by increasing the expansion / contraction speed of the rod of the air cylinder, and further to provide a tire molding technique capable of reducing the amount of air used during expansion / contraction of the rod. it can.

It is a figure which shows typically the structure of the air piping of the operation | movement control mechanism of the bead setter which concerns on one embodiment of this invention. It is a figure explaining the operation control method of the bead setter concerning one embodiment of the present invention. It is a figure which shows the conventional bead setter typically, Comprising: (a) is a top view, (b) is a front view. It is a figure which shows typically the structure of the air piping of the operation control mechanism of the conventional bead setter. It is a figure explaining the operation control method of the conventional bead setter.

  Hereinafter, the present invention will be described with reference to the drawings based on embodiments.

1. Tire Forming Device According to the Present Embodiment Also in the present embodiment, a pair of air cylinders are attached to the bead setter, similarly to the conventional bead setter shown in FIG.

  FIG. 1 is a diagram schematically showing the structure of the air piping of the operation control mechanism of the bead setter according to the present embodiment, and schematically shows the operation control mechanism of the bead setter according to the present embodiment.

  As shown in FIG. 1, in this embodiment, the air pipe 5 is configured so that air is supplied from an air supply source (not shown) to the air port 1a on the head side and the air port 1b on the rod side of the air cylinder 1. A three-position solenoid valve 3 is provided in order to switch the air supply / exhaust to each air port 1a, 1b. Reference numerals 8 </ b> A and 8 </ b> B in FIG. 1 are supply / exhaust pipes that connect the air ports 1 a and 1 b of the air cylinder 1 and the solenoid valve 3.

  In the present embodiment, instead of the regulators 4A and 4B in the conventional air piping shown in FIG. 4, the first and second power valves 6A and 6B, and the first and second electropneumatic regulators 7A are used. , 7B are provided.

  The first power valve 6A and the first electropneumatic regulator 7A are provided to adjust the pressure of the air supplied to the rod-side air port 1b. The second power valve 6B and the second electropneumatic regulator 7B is provided to adjust the pressure of the air supplied to the head-side air port 1a.

  These power valves 6A and 6B and electropneumatic regulators 7A and 7B are controlled by control means not shown. For example, the first and second electropneumatic regulators 7A and 7B and the first and second power valves 6A and 6B each have a pressure of 0.05 to 0.05 to the air pressure supplied to the air ports 1a and 1b of the air cylinder 1. It is controlled to adjust in the range of 0.9 MPa.

2. Next, an operation control method for the bead setter according to the present embodiment will be described. In the following, in order to help understanding of the present invention, the operation control method in the present embodiment will be described after specifically describing the operation control method of the conventional bead setter.

(1) Conventional Bead Setter Operation Control Method Conventionally, the reciprocating operation of the bead setter has been controlled by the operation control method shown in FIG. 5 under the air pipe having the structure shown in FIG. 5A and 5B are diagrams for explaining a conventional method for controlling the operation of the bead setter. FIG. 5A shows the control when the rod of the air cylinder 1 is contracted, and FIG. 5B shows the extension of the rod of the air cylinder 1. It is a figure which shows the control at the time.

  As shown in FIGS. 5A and 5B, conventionally, when the rod of the air cylinder 1 is expanded and contracted, the air pressure from the first and second regulators 4A and 4B is always the same pressure (0.5 MPa). Is set.

  When the rod of the air cylinder 1 is contracted, as shown in FIG. 5A, by switching the solenoid valve 3, air having a pressure of 0.5 MPa is supplied from the second regulator 4B to the rod-side air port 1b. And 0.5 MPa of air filled in the head-side air port 1a is exhausted to the outside.

  As a result, the amount of air in the air port 1b on the rod side becomes larger than the amount of air in the air port 1a on the head side, and the rod of the air cylinder 1 contracts.

  On the other hand, when the air cylinder 1 is extended, as shown in FIG. 5B, by switching the solenoid valve 3, air having a pressure of 0.5 MPa is supplied from the first regulator 4A to the air port 1a on the head side. At the same time, the air of 0.5 MPa pressure filled in the air port 1b on the rod side is exhausted to the outside.

  As a result, the air amount in the air port 1a on the head side is larger than the air amount in the air port 1b on the rod side, and the rod of the air cylinder 1 extends.

  Thus, in the conventional operation control method, the air pressure supplied to the air port 1b on the rod side and the air pressure supplied to the air port 1a on the head side are the same pressure (0.5 Mpa) when the rod is expanded and contracted. Since the rod is expanded and contracted only by the difference between the air amount in the air port 1b on the rod side and the air amount in the air port 1a on the head side, the switching operation of the rod expansion and contraction of the air cylinder 1 is slow. The expansion / contraction speed was slow.

(2) Operation control method of bead setter according to this embodiment FIG. 2 is a diagram for explaining an operation control method of a bead setter according to an embodiment of the present invention. Control when contracting, (b) shows control when switching from contraction to extension of the rod, and (c) shows control when extending the rod of the air cylinder 1.

  In the present embodiment, the pressure of the air supplied to the air cylinder 1 is lowered below the conventional pressure by the first and second electropneumatic regulators 7A and 7B and the first and second power valves 6A and 6B. At the same time, before the rod of the air cylinder 1 is expanded and contracted, the pressure of the air supplied to the exhausted air port is reduced in advance. This will be specifically described below.

(A) When the rod of the air cylinder 1 is contracted, as shown in FIG. 2A, the solenoid valve 3 is switched so that the second electropneumatic regulator 7B and the second power valve 6B Air with a pressure of 1 MPa was filled (see (d) described later). Air with a pressure of 0.3 MPa was supplied to the air port 1b on the rod side, and 0.1 MPa was filled in the air port 1a on the head side. Exhaust the air of the pressure of the outside.

  Thus, in the present embodiment, not only does the air amount in the air port 1a on the head side and the air amount in the air port 1b on the rod side differ from each other as in the prior art, but also in the air port 1a on the head side. By creating an air pressure difference between the rod side air port 1b and the rod side, the rod can be contracted at a higher speed than in the prior art.

(B) Thereafter, when the rod is sufficiently contracted and the air cylinder 1 is stopped, the pressure of the air supplied to the air port 1b on the rod side is changed from 0.3 MPa to 0.1 MPa as shown in FIG. Decrease the pressure.

(C) When the rod of the air cylinder 1 is extended, as shown in FIG. 2 (c), the solenoid valve 3 is switched to move the head from the first electropneumatic regulator 7A and the first power valve 6A. Air with a pressure of 0.3 MPa is supplied to the air port 1a on the side, and air with a pressure of 0.1 MPa filled in the air port 1b on the rod side is exhausted to the outside.

  This not only causes a difference between the air amount in the head-side air port 1a and the air amount in the rod-side air port 1b as in the prior art, but also between the head-side air port 1a and the rod-side air port 1b. By creating an air pressure difference therebetween, the rod can be extended at a higher speed than before.

(D) Thereafter, when the rod is sufficiently extended and the air cylinder 1 is stopped, the pressure of the air in the air port 1a on the head side is lowered from 0.3 MPa to 0.1 MPa. Thereafter, the above (a) to (d) are repeated.

  As described above, according to the present embodiment, the rod can be expanded and contracted at a high speed, so that the reciprocating operation of the bead setter can be made faster than before and the productivity in the primary molding of the tire can be improved. it can.

  Further, in the present embodiment, by using the power valves 6A and 6B and the electropneumatic regulators 7A and 7B, the pressure of the air supplied to each air port is arbitrarily adjusted so that the air pressure is lower than the conventional one. Since the rod can be expanded and contracted, air consumption can be reduced.

  The operation control mechanism in the present embodiment can be configured by changing only the air piping while maintaining the conventional mechanical structure such as the bead setter and the air cylinder. It does not occur.

  Hereinafter, the present invention will be specifically described based on examples.

1. Example and Comparative Example (1) Example Using an operation control mechanism according to the present embodiment as shown in FIG. 1, the rod of the air cylinder (volume: 0.25 m ³ ) is moved in the procedure as shown in FIG. The bead setter was moved by expanding and contracting. And when producing one tire, the movement time and exhaust air amount when a bead setter reciprocates twice were measured.

(2) Comparative Example Using the conventional operation control mechanism as shown in FIG. 4, under the same conditions except that the bead setter was moved by expanding and contracting the rod of the air cylinder in the procedure as shown in FIG. Tires were produced, and the travel time and exhaust air amount when the bead setter reciprocated twice were measured.

2. Measurement result (1) Movement time The movement time of the bead setter in the examples and comparative examples was as follows.

(A) Example 1.5 sec (time required for one traverse movement) × 4 times (2 reciprocations) = total 6.0 sec

(B) Comparative Example 1.8 sec (time required for one traverse movement) × 4 times (2 reciprocations) = total 7.2 sec

  From the above results, the moving time of the bead setter is shorter in the example than in the comparative example, and the cylinder rod expansion / contraction switching operation is performed after the pressure of the exhausted air pressure is reduced in advance. It was confirmed that the bead setter can be moved faster than before.

(2) Exhaust air amount The measurement results of the exhaust air amount in the examples and comparative examples were as follows.
(A) Example 0.25 m ³ (air pressure 0.3 MPa) during first rod side movement
0.25m ³ (air pressure 0.3MPa) at the first head side movement
0.25m ³ (air pressure 0.5MPa) during second rod side movement
(The second rod side movement is performed with the same air pressure as before because the load is high)
0.25m ³ (Air pressure 0.3MPa) during second head side movement
⇒Total 0.25m ³ (Air pressure 0.5MPa) + 0.75m ³ (Air pressure 0.3MPa)

(B) Comparative example 0.25 m ³ (air pressure 0.5 MPa) during first rod side movement
0.25m ³ (air pressure 0.5MPa) at the time of first head side movement
0.25m ³ (air pressure 0.5MPa) during second rod side movement
0.25m ³ (Air pressure 0.5MPa) during second head side movement
⇒Total 1.00m ³ (Air pressure 0.5MPa)

  As described above, in the embodiment, except that 0.5 MPa air is supplied to the air port once, 0.3 MPa air is supplied to appropriately expand and contract the rod of the air cylinder. And since the amount of air used when supplied at 0.3 MPa is less than the amount of air used when supplied at 0.5 MPa, the amount of air compared to the comparative example in which 0.5 MPa of air was supplied four times was used. It was confirmed that the amount used could be reduced.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiments within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1 Air cylinder 1a Head side air port 1b Rod side air port 2 Bead setter 3 Solenoid valve 4A 1st regulator 4B 2nd regulator 5 Air piping 6A 1st power valve 6B 2nd power valve 7A 1st electropneumatic Regulator 7B Second electropneumatic regulator 8A, 8B Supply / exhaust conduit

Claims (4)

An operation control mechanism for a bead setter that controls the reciprocation of a bead setter that sets a bead on a tire band molded on a former,
An air cylinder having an air port on each of the head side and the rod side, and extending and contracting the rod by a difference in air pressure between each air port generated by supply and exhaust of each air port;
Control means for controlling the air pressure in each of the air ports,
An operation control mechanism for a bead setter, wherein the control means has a control function of pre-pressurizing a rod-side air port when the rod is extended and a head-side air port when the rod is contracted. The control means is
A solenoid valve for switching supply and exhaust of air to the air port on the head side and rod side of the air cylinder;
A first power valve and a first electropneumatic regulator for adjusting the pressure of air supplied to the air port on the rod side of the air cylinder;
A second power valve for adjusting a pressure of air supplied to the air port on the head side of the air cylinder and a second electropneumatic regulator;
When the rod is extended, the air port on the rod side of the air cylinder is previously depressurized, and then the solenoid valve is switched to supply air to the air port on the head side and exhaust air from the air port on the rod side. To extend the rod,
When the rod contracts, the air port on the head side of the air cylinder is depressurized in advance, the solenoid valve is switched to supply air to the air port on the rod side, and the air in the air port on the head side is exhausted. The operation control mechanism of the bead setter according to claim 1, wherein the rod is controlled to contract by doing so.   A tire forming apparatus, comprising the bead setter operation control mechanism according to claim 1. An operation control method for a bead setter for controlling a reciprocating operation of a bead setter for setting a bead on a tire band formed on a former,
Using the operation control mechanism of the bead setter according to claim 1 or 2,
When the rod is extended, the air port on the rod side of the air cylinder is depressurized in advance, then air is supplied to the air port on the head side and the rod is extended by exhausting air from the air port on the rod side. ,
When the rod is contracted, the air port on the head side of the air cylinder is depressurized in advance, then air is supplied to the air port on the rod side, and the rod is contracted by exhausting air from the air port on the head side. The bead setter operation control method characterized by controlling as follows.

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