JP2000037730A - Tire vulcanizing press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce production cost while easily performing the arrangement of a tire conveying device or the replacing work of a tire mold, and to reduce the number of parts without lowering the stability of a tire vulcanizing press. SOLUTION: A guide support 17 is longitudinally provided in the middle between right and left molds and has the lower edge fixed to a base, an elevating bracket 16 is elevated and lowered by being guided by the guide support 17, and a column 10 has the upper edge fixed to the elevating bracket 16 and the lower edge removably provided. At the time of the tire vulcanization, the molds are clamped and kept in the closed condition through upper and lower bolster plates 12, 2 by coupling the lower edge of the column 10, and at the time of tire conveyance, the upper bolster plate 12 is elevated and lowered by releasing the coupling of the lower edge of the column 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire vulcanizing press for vulcanizing a tire used in an automobile or the like.

[0002]

2. Description of the Related Art Conventionally, tire vulcanizing presses include a type in which a tire die is mounted on a mechanical crank tire vulcanizing press, and a type in which a tire die is mounted on a hydraulic press type tire vulcanizing press. However, the latter hydraulic press tire vulcanizing press, which has rapidly spread with the advancement of uniformity required for tires, will be described below.

[0003] This hydraulic press tire vulcanizing press has a base in which a lower mold portion is assembled via a hot plate and a heat insulating material, and an upper mold portion in which the upper mold portion is assembled via a hot plate and a heat insulating material. Bolster plate, upper bolster plate elevating mechanism that opens and closes the tire mold when loading and unloading the tire into and out of the tire mold, beam with a pressurized cylinder, and tire molds with different thicknesses can be used interchangeably A pressurizing spacer whose height is made variable by a screw mechanism or the like and which is inserted between the piston of the pressurizing cylinder and the upper bolster plate; And a beam and column integrated into a steel plate welded structure). This hydraulic press tire vulcanizing press has a loader and a loader for loading and unloading tires from the tire mold. Unloader and the like are included.

[0004]

The conventional hydraulic press tire vulcanizing press has the following problems. That is, the tire mold receives a force to open from the tire due to the pressure of the heating and pressurizing medium introduced into the tire during vulcanization, and the tire mold is maintained in a closed state against this. For this purpose, a hydraulic pressurized tire vulcanizing press for passenger car tires requires a force of around 100 Ton, and a hydraulic pressurized tire vulcanizing press for truck and bus tires requires a force of around 500 Ton.

Therefore, the base, the beam, the column, the upper bolster plate, and the like need to have a strong structure that can withstand the above-mentioned force, and the height of the press increases. Techniques for solving such problems (for example, those described in JP-A-59-71842) have already been proposed, but are insufficient.
In addition to that, there is a problem that the presence of the column is a constraint condition, which makes it difficult to arrange the tire loading / unloading device and replace the tire mold.

The present invention has been proposed in view of the above problems, and its object is to reduce the manufacturing cost and to facilitate the arrangement of the tire loading / unloading device and the tire mold changing operation. Another object of the present invention is to provide a tire vulcanizing press capable of reducing the number of parts without deteriorating the stability of the tire vulcanizing press and having a large working space for tire mold replacement.

[0007]

In order to achieve the above object, a tire vulcanizing press according to the present invention has dies for vulcanizing tires arranged on the left and right sides, and each upper die of the respective dies. An upper bolster plate to which parts are assembled, a lower bolster plate to which each lower mold part of the same mold is assembled, and an elevating bracket for holding the upper bolster plate,
A pressurizing cylinder for pressing the mold in a closed state against a force to open the mold generated by the action of a pressurizing and heating medium introduced into the tire during vulcanization, and In a twin-type tire vulcanizing press having a plurality of columns that tighten and hold the mold in a closed state via a bolster plate and an elevating cylinder that elevates the elevating bracket, an erect stand is provided between the left and right dies. The lower end is provided with a guide column fixed to the base, the elevating bracket is guided by the guide column to move up and down, the column is fixed at the upper end to the elevating bracket, the lower end is configured to be detachable, At the time of tire vulcanization, the lower end of the column is connected and the mold is tightened and held via the upper and lower bolster plates. And wherein the raising and lowering of the coater plate (claim 1).

In the tire vulcanizing press, the pressurizing cylinder may be arranged on an extension of the axis of each column. Further, an external thread may be formed in the column, and the column may be screwed with an internal thread formed on an inner periphery of a nut rotatably incorporated in the upper bolster plate (claim 3). Further, three columns may be arranged around each of the dies (claim 4).

[0009]

According to the first aspect of the present invention, there is provided a hydraulic pressing tire vulcanizing press.
The following actions are performed. That is, at the time of tire vulcanization, the piston of each pressurizing cylinder and each column are connected, and the upper and lower bolster plates are pulled through each column to perform pressure tightening of the tire mold. The connection between the piston of each pressurizing cylinder and each column is released, and the upper bolster plate is moved up and down by another cylinder as before. If the respective columns are assembled to the upper bolster plate, the respective columns obstructing the loading and unloading of the tire can be raised together with the upper bolster plate. When replacing with a tire mold having a different thickness, in the case of a platen type, the nut is turned to change the effective length of each column.

[0010] Theoretically, the number of columns can be reduced to two. However, in practice, an eccentric load acts on the tire mold due to tolerances in machining and assembly, which is inconvenient. When the number of columns is four or more, the number of parts increases and the cost increases.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a hydraulic press tire vulcanizing press according to the present invention will be described with reference to an embodiment shown in FIGS.
FIG. 1 shows a state in which the tire mold M (the upper mold part Ma and the lower mold part Mb) is closed, and FIG. 3 shows an opened state, and is a line bb in FIGS. 1 and 3. , The left side shows a state in which a thick tire mold M is mounted, and the right side shows a state in which a thin tire mold M is mounted.

Reference numeral 1 denotes a base fixed to the mounting base 21;
Is a lower bolster plate fixed to the base 1. In this embodiment, the lower bolster plate 2 is made as a separate product in order to match the upper bolster plate 12 as much as possible, but may be integrated with the base 1. . Mb is a lower mold part attached to the lower bolster plate 2 by a known means via the heat insulating plate 3 and the hot plate 4, and Ma is a known mold to the upper bolster plate 12 via the heat insulating plate 7 and the hot plate 6. The assembled upper mold part 5 is a known heat shield.

Reference numeral 8 denotes a hydraulic pressurizing cylinder (to be described in detail later) bolted to the lower bolster plate 2, and 9 is fixed to a piston of the pressurizing cylinder 8 so that the upper surface is lower than the upper surface of the hot plate 4. Lock housing located in the 1
Numeral 0 denotes a plurality of columns (three in this embodiment, three for one set of tire dies) detachable from the lock housing 9, 11
Is a nut having an internal thread which engages with a male thread formed on the upper part of the column 10 and is rotatably incorporated in the upper bolster plate 12. Reference numeral 13 denotes a chain wheel screwed to the nut 11 and an upper bolster plate 12. The nut 11 also prevents the nut 11 from coming off. 15 is nut 1
A chain 14 is hung on the chain wheel 13 and the chain wheel fixed to the output shaft of the motor 15 by the single-rotation drive motor.

Reference numeral 16 denotes a bracket which moves up and down by using a guide column 17 whose lower end is bolted to the base 1 by the action of an elevating cylinder 18 as a guide.
Are fixed at their upper ends. 19 is a cylinder,
The cylinder 19 is used for opening and closing the mold when a tire mold of a so-called sectional mold in which a tread mold portion is divided into a plurality in the circumferential direction is mounted. The cylinder 19 is bolted to the upper bolster plate 12. 20 is a lower center mechanism (during tire vulcanization,
A known lower center mechanism that operates a bladder that is used by being inserted into the inside of a tire), the lower center mechanism 20 is vertically provided at the center of the lower heating plate 4. 22 is a guide rail for raising and lowering the loader having a known gripping means 23.

A pressure cylinder 8 is bolted to the lower surface of the lower bolster plate 2, a piston 24 is inserted into the pressure cylinder 8, and a franc 25 is screwed into the pressure cylinder 8. A reciprocating hydraulic cylinder in which a seal member is incorporated in a lower portion of the lock housing 9 in which a central cylindrical portion 9 a is formed in a lower bolster plate 2.
Slidably inserted in the lower end 9 of the lock housing 9.
b passes through a hole 24a formed inside the piston 24, and then a nut 27 screwed into the washer 26 and the lower end 9b.
Thus, the piston 24 is clamped and fixed to the lock housing 9.

A cotter 29 is slidably inserted into a horizontally formed rectangular hole in the upper part of the lock housing 9, and a tip 30 a of a piston rod of a cylinder 30 bolted to the lock housing 9 is provided in the cotter 29. The pair of cotters slide in the direction of contact and separation by the action of the cylinder 30. 28 is a nut and nut 2
8, a notch 28a is formed in the center from both left and right sides to form an E-shape when viewed from the side. The nut 28 is screwed into the lower end of the column 10 and is prevented from rotating by a known means such as a knock pin. And column 10 descends, column 1
0 is adjusted in advance so that the notch 28a of the nut 28 and the rectangular hole 9c of the lock housing 9 coincide with each other when the bottom surface of the lock member 9 contacts the bottom surface 9d of the upper recess of the lock housing 9. When the cotter 29 is approached, the cotter 29 straddles the notch 28a and the rectangular hole 9c to connect and lock the two, and when the cotter 29 is moved away, the connection between the two is released.

In this embodiment, the pressurizing cylinder 8 is bolted to the lower surface of the lower bolster plate 2.
Bolting to the top side of the lower bolster plate 2,
It may be integrated with the lower bolster plate 2. Instead of attaching and detaching to and from the column 10 on the upper surface side of the lower bolster plate 2, the column 10 is
And the column 10 and the piston 24 may be attached and detached on the lower surface side of the pressurizing cylinder 8.

Next, the operation of the hydraulic press tire vulcanizing press will be described in detail. The raw tire to be vulcanized next time is loaded (see FIG. 3), and the hydraulic chamber 8b below the pressurizing cylinder 8 is placed.
When the piston 24 is lifted by introducing a slight hydraulic pressure to the tire, the tire mold M is closed while shaping the raw tire by a known procedure, and the lower surface of the column 10 is brought into contact with the lock housing 9. Thereafter, the piston 24 is pushed back and descends, and the tire mold M is completely closed.

When the tire mold M is completely closed, the cylinder 30 is actuated to bring the cotter 29 close and the nut 28
A cotter 29 is inserted into the notch 28a of the pressurizing cylinder 8, the piston 24 of the pressurizing cylinder 8 and the column 10 are connected via the lock housing 9, and then a high-pressure hydraulic pressure is applied to the hydraulic pressure chamber 8a above the pressurizing cylinder 8. By introducing and lowering the column 10, the tire mold M is tightened via the lower bolster plate 2 and the upper bolster plate 12.

Next, a heating and pressurizing medium is introduced into the tire, and the tire enters a vulcanized state (see FIG. 1). When the vulcanization step is completed, the heating and pressurizing medium in the tire is discharged in the reverse procedure, then the connection between the piston 24 and the column 10 is released, and then the tire mold M is opened and the vulcanized Take out the tire. When replacing the tire mold M, the tire mold M is closed once in an empty state, then the assembly of the upper mold part Ma and the hot plate 6 is released, the upper bolster plate 12 is raised, and the upper mold is removed. The press is opened with the mold part Ma placed on the lower mold part Mb. After the assembly of the lower mold portion Mb and the hot plate 4 is released, the tire mold M is taken out of the machine by a forklift or the like, and then the tire mold M to be mounted is carried in. The part Mb is assembled and fixed to the hot plate 4.

Next, with the piston 24 raised,
The upper bolster plate 12 is lowered. When the lower surface of the column 10 is brought into contact with the lock housing 9, the nut 11 is rotated and adjusted so that the hot plate 6 and the upper surface of the mold portion Ma are slightly squeezed, and then the liquid flows from the liquid chamber 8 b of the cylinder 8. The pressure is released, the hot plate 6 is brought into contact with the upper mold portion Ma, the upper mold portion Ma is assembled and fixed to the hot plate 6, and the replacement of the tire mold M is completed.

[0022]

As described above, the hydraulic press tire vulcanizing press of the present invention has the above-described output of each pressurized cylinder (column lowering force).
To the tire mold through each column and the upper and lower bolster plates, tighten the tire mold, and open the tire mold caused by the pressure of the heating and pressurizing medium introduced into the tire during tire vulcanization. Since the tire mold is kept closed against the force of the tire, the force is not transmitted to the base or the upper bolster plate elevating bracket, etc. As long as it can withstand the required force, it is sufficient, it does not need to be stiffened, and it is possible to integrate the bracket for lifting and lowering the bolster plate on the conventional hydraulic press vulcanizing press and the beam as a strength member, The number of members can be reduced, and the structure can be simplified, in contrast to the fact that it is not necessary to increase the rigidity as described above, and the manufacturing cost can be reduced. Moreover, by changing the effective length of the column by rotating the nut without compromising the advantage of reducing the height of the press, it is possible to respond to changes in the thickness of the mounted tire mold, so the stroke of the pressure cylinder is extremely short. The production cost can be reduced from this point.

Further, since each column is fixed to the upper bolster plate, the presence of the column does not become a constraint,
The arrangement of the tire loading / unloading device and the tire mold changing operation can be easily performed. Also, when the required space ratio of the column and the piston attachment / detachment portion is relatively small when the tire vulcanizing press is small, the number of columns is reduced to three in the present invention because the required tightening force can be reduced. Has been reduced,
The number of parts can be reduced without lowering the stability of the tire vulcanizing press, and a large work space can be obtained when replacing the tire mold.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a hydraulic tire vulcanizing press of the present invention.

FIG. 2 is a cross-sectional plan view taken along the line aa of FIG.

FIG. 3 is a longitudinal sectional view showing another embodiment of FIG. 1;

FIG. 4 is a longitudinal sectional view taken along line cc of FIG. 2;

FIG. 5 is a transverse sectional view taken along line dd of FIG. 4;

6 is a cross-sectional view taken along the line ee in FIG. 5;

[Explanation of symbols]

 Ma Upper mold part of tire mold M Mb Lower mold part of tire mold M 2 Lower bolster plate 8 Pressurizing cylinder 9 Lock housing 10 Column 11 Tire mold thickness adjusting nut 12 Upper bolster plate 16 Upper bolster plate lifting bracket 17 Guide column 18 Upper bolster plate lifting / lowering cylinder 24 Piston of pressurizing cylinder 8 28 Column lower end nut 29 Column attaching / detaching cotter 30 Cotta moving cylinder

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B29L 30:00

Claims (4)

[Claims] 1. A tire vulcanization mold is disposed on the left and right sides,
An upper bolster plate to which each upper mold part of each mold is assembled, a lower bolster plate to which each lower mold part of the same mold is assembled, an elevating bracket for holding the upper bolster plate, Through a pressure cylinder that tightens the mold in a closed state against the force to open the mold generated by the action of the pressurized heating medium introduced into the tire, and the bolster plate In a twin-type tire vulcanizing press having a plurality of columns for tightening and holding the mold in a closed state and an elevating cylinder for elevating and lowering the elevating bracket, a vertical stand is provided between the left and right dies, A guide column fixed to the base is provided, and the elevating bracket is guided by the guide column to move up and down, and the upper end of the column is fixed to the elevating bracket. The lower end is constituted detachably,
At the time of tire vulcanization, the lower end of the column is connected and the mold is closed and held via the upper and lower bolster plates, and when the tire is carried in and out, the connection is released and the upper bolster plate is raised and lowered. And tire vulcanizing press. 2. The tire vulcanizing press according to claim 1, wherein the pressurizing cylinder is disposed on an axial extension of each of the columns. 3. The column according to claim 1, wherein a male screw is formed on the column, and the column is screwed with a female screw formed on an inner periphery of a nut rotatably incorporated in the upper bolster plate. The tire vulcanizing press according to any one of the above. 4. The tire vulcanizing press according to claim 1, wherein three of said columns are arranged around each of said molds.