JP4242023B2 - Automatic clamping device in tire vulcanizer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic clamping device used for fastening upper and lower molds and fixing a ladder in a tire vulcanizing apparatus for vulcanizing and molding a raw tire (green tire).
[0002]
[Prior art]
In a tire vulcanizing apparatus, it is required to fasten a mold and replace a ladder in order to improve productivity. Therefore, an automatic clamping device has been used instead of bolt fixing which takes time to attach and remove.
In such an automatic clamping device, an engagement mechanism for engaging or releasing the engaging portion with respect to the clamped body, and a lock mechanism for positioning the locking portion at the lock position and the unlock position with respect to the clamped body are provided. It is done.
Conventionally, a spring member such as a disc spring is used for the engagement mechanism in order to obtain a stable clamping force, and a hydraulic cylinder or the like is used as a driving means for receiving the urging force of the spring member and releasing the clamp. I used it. In the lock mechanism, an air motor or the like is used as a drive means for rotating the engaging portion between the lock position and the unlock position. Thus, separate drive means are provided for the engagement mechanism and the lock mechanism. It was used.
[0003]
[Problems to be solved by the invention]
However, if separate driving means are used for the engagement mechanism and the lock mechanism as in the prior art, the cost increases and the structure becomes complicated.
Further, when a hydraulic cylinder or the like is used for the engagement mechanism, a high output can be obtained, but there is a problem that maintenance and handling become difficult.
[0004]
The present invention has been made in order to solve the above-described conventional problems, and does not use a high output drive means such as a hydraulic cylinder as a drive means of the engagement mechanism, so that a low output light drive force is achieved. An automatic clamping device in a tire vulcanizing apparatus that can operate the engagement mechanism (release the locking portion) with the common drive means. The issue is to provide.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the automatic clamping device in the tire vulcanizing apparatus of the present invention is:
An engagement mechanism comprising a clamp rod having a locking portion formed at the tip, and reciprocating the clamp rod in the axial direction to engage or release the locking portion with respect to the clamped body, and the locking portion An automatic clamping device having a lock mechanism for positioning the locking portion in a locked position and an unlocked position with respect to the clamped body by reciprocatingly rotating the clamp rod in the released state of
The engagement mechanism includes a spring member (laminated disc spring) that urges the clamp rod to engage the locking portion with the clamped body, and receives the urging force of the spring member to hold the locking portion to the clamped body. And a cam lever having a cam formed at the tip for reciprocating the spacer between the spring separation position and the biasing force receiving position. The lock mechanism is interlocked with the operation of the cam lever. A cam groove formed in the plate cam so that a plate cam (cylindrical cam) that reciprocates in the axial direction of the clamp rod and a guide member (guide pin) protruding from the clamp rod are slidably fitted. And
The cam groove releases the movement of the plate cam by releasing the engagement with the guide member until the spacer moves from the spring separation position to the biasing force receiving position by the operation of the cam lever and releases the locking portion. The escape groove portion and the inclined engagement groove portion that engages with the guide member accompanying the movement of the plate cam in the released state of the locking portion and rotates the clamp rod from the lock position to the unlock position are formed. .
[0006]
In this automatic clamping device, the clamp rod is urged by the spring member at the locked position, whereby the engaging portion is engaged with the clamped body, and the clamped body is clamped in the engaged state.
When the cam lever is operated in this engaged state, the spacer moves forward from the spring separation position to the biasing force receiving position by the cam at the tip, and receives the biasing force of the spring member. As a result, the urging force applied to the clamp rod from the spring member is cut off, and the engagement of the locking portion with the clamped body is released.
In this case, the plate cam moves forward in conjunction with the operation of the cam lever, and at this time, the relief groove portion of the cam groove slides on the guide member until the locking portion is released. The clamp rod is not rotated by the movement of the plate cam. When the locking portion is released by the operation of the cam lever, the inclined engaging groove portion of the cam groove slides on the guide member as the plate cam moves forward. Therefore, the clamp rod rotates from the locked position to the unlocked position by the rotational force applied to the guide member as a result of the engagement with the inclined engagement groove, and the clamped rod is held with the clamp rod held at the unlocked position. The body can be removed from the automatic clamping device.
[0007]
When fixing the clamped body with an automatic clamping device, set the clamped body with the clamp rod held in the unlocked position, and operate the cam lever in the opposite direction. The cam returns. By the backward movement of the plate cam, the inclined engaging groove portion of the cam groove slides on the guide member, the clamp rod rotates from the unlocked position to the locked position, and then the spacer moves the spring away from the biasing force receiving position by the operation of the cam lever. Move forward to position. Thereby, the urging force of the spring member is applied to the clamp rod, and the locking portion can be engaged with the clamped body.
[0008]
As described above, since the biasing force of the spring member is received by the operation of the cam lever provided with the cam at the tip, the locking portion can be released by a light driving force of low output, for example, an air cylinder, by the action of the lever by the cam lever. it can.
In addition, the clamp rod rotates between the unlock position and the lock position by sliding between the cam groove and the guide member due to the reciprocating movement of the plate cam, and this operation is performed in the unlocked state. Therefore, the driving force can be reduced. In addition, since the operation of the plate cam is interlocked with the operation of the cam lever, the cam lever driving means is also used as the plate cam driving means, and one driving means is used as a common driving means for the cam lever and the plate cam. it can.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an embodiment of the present invention, and is an overall cross-sectional view of an automatic clamping device used for fixing a ladder in a tire vulcanizing device, and FIGS. 2 and 3 are cross-sectional views showing an operating state of the automatic clamping device. FIG. 4 is a development view of a cylindrical cam (plate cam) provided in the automatic clamping device.
[0010]
In the figure, reference numeral 1 denotes a tire vulcanizing apparatus, which includes an upper mold 10 and a lower mold 11 that are divided into upper and lower parts, and a rubber ladder 2 and is held between the upper mold 10 and the lower mold 11. The raw tire T is formed so as to be heated while being pressed against both molds 10 and 11 from the inside by the pradder 2.
[0011]
The said ladder 2 is formed in a cylindrical shape, and an upper clamp 21 and a lower clamp 22 are fixed to the upper end and the lower end, respectively. The lower clamp 22 is detachably coupled to the upper end portion of the center post 13 and mounted in the molds 10 and 11 while being detachably fixed to the bag head 12 by the automatic clamping device A.
[0012]
In the automatic clamping device A, a locking portion 30 formed on the upper end of the clamp rod 3 is detachably engaged with a locking groove 23 formed on the lower surface of the lower clamp 22 as a clamped body. Then, the engagement mechanism 4 that engages the engagement portion 30 with the engagement groove 23 (state of FIG. 1) or releases (state of FIG. 2) by reciprocating the clamp rod 3 in the vertical direction, A lock that positions the locking portion 30 in the locking position (position in FIG. 1) and the unlocking position (position in FIG. 3) with respect to the locking groove 23 by reciprocatingly rotating the clamp rod 3 with the locking portion 30 released. A mechanism 5 is provided.
[0013]
The engaging mechanism 4 receives and latches the laminated disc spring 40 that urges the clamp rod 3 downward and engages the engaging portion 30 with the engaging groove 23, and receives the urging force of the laminated disc spring 40. A spacer 41 for releasing the portion 30 from the locking groove 23, and a cam 42 for reciprocating the spacer 41 between a spring separation position (position in FIG. 1) and a biasing force receiving position (position in FIG. 2) A formed cam lever 43 is provided.
[0014]
In this case, a cylinder cylinder 44 is suspended from the lower surface of the bag head 12, and a through hole 14 coinciding with the cylinder cylinder 44 is formed in the bag head 12, and the upper portion of the clamp rod 3 is inserted into the through hole 14. The lower side of the clamp rod 3 is inserted into the cylinder cylinder 44.
A spacer 41 is slidably fitted in the inner bottom portion of the cylinder cylinder 44 so that the lower end large-diameter portion 31 of the clamp rod 3 is slidably fitted in the spacer 41. In the engaged state in which the portion 30 is engaged with the locking groove 23, as shown in FIG. 1, the protruding portion of the lower end large diameter portion 31 comes into contact with the lower end of the laminated disc spring 40 via the washer 45, and the locking portion In the released state in which 30 is separated from the locking groove 23, the upper end of the spacer 41 comes into contact with the lower end of the laminated disc spring 40 via a washer 45 as shown in FIG. 2.
The cam lever 43 is pivotally supported by a shaft 46 on the cylinder cylinder 44 by a shaft 46, and a cam surface 47 whose radius from the shaft center is gradually changed is a bearing 48 as a cam follower at the lower end of the clamp rod 3. It comes to contact via. Further, an air cylinder 49 as a driving means attached to the cylinder cylinder 44 is connected to the base end of the cam lever 43.
[0015]
Therefore, when the air cylinder 49 is advanced, the cam lever 43 is rotated upward, and the spacer 41 is lifted upward from the spring separation position to the urging force receiving position by the cam 42. The urging force of the disc spring 40 is received, and the locking portion 30 can be released from the locking groove 23.
[0016]
The lock mechanism 5 is provided with a cylindrical cam 50 (plate cam) that reciprocates in the axial direction of the clamp rod 3 in conjunction with the operation of the cam lever 43, and the cylindrical cam 50 projects from the clamp rod 3. A cam groove 52 in which the guide pin 51 (guide member) thus formed is slidably fitted is formed.
[0017]
In this case, the cylindrical cam 50 is fitted to the outer periphery of the cylinder cylinder 44 so as to be slidable in the vertical direction, and the lower end thereof is connected to the air cylinder 49 as the driving means via a bracket 59.
Also, in the cam groove 52 formed in the cylindrical cam 50, as shown in FIG. 4, the spacer 41 is moved from the spring separation position to the urging force receiving position by the operation of the cam lever 43 to release the locking portion 30. In the meantime, the engagement with the guide pin 51 is released to release the movement of the cylindrical cam 50, and the engagement groove 30 is released to engage with the guide pin 51 as the cylindrical cam 50 moves. In combination, an inclined engaging groove portion 54 is formed for rotating the clamp rod 3 from the locked position to the unlocked position. The spacer 41 is formed with a horizontally long hole (not shown) for releasing the rotation of the guide pin 51, and the cylinder tube 44 is a vertically long hole for releasing the vertical movement of the guide pin 51 accompanying the vertical movement of the clamp rod 3. (Not shown) is formed. Reference numeral 55 denotes a relief groove for the cam lever.
[0018]
In this automatic clamping device A, as shown in FIG. 1, the clamp rod 3 is biased downward by the laminated disc spring 40 in the locked position, so that the locking portion 30 is engaged with the locking groove 23. In this engaged state, the lower clamp 22 is fixed.
When the cam lever 43 is operated upward by the air cylinder 49 in this engaged state, the spacer 41 is slid upward from the spring separation position to the biasing force receiving position by the cam 42 at the tip, as shown in FIG. The biasing force of the spring 40 is received. As a result, the urging force applied to the clamp rod 3 from the laminated disc spring 40 is cut off, so that the engagement of the locking portion 30 with the locking groove 23 is released.
In this case, the cylindrical cam 50 slides upward in conjunction with the operation of the cam lever 43 by the air cylinder 49. At this time, the cam groove 52 escapes until the locking portion 30 is released. Since the groove 53 slides on the guide pin 51, the clamp rod 3 is not rotated by the sliding of the cylindrical cam 50. When the locking portion 30 is released by the operation of the cam lever 43, the inclined engagement groove portion 54 of the cam groove 52 slides on the guide pin 51 as the cylindrical cam 50 slides. Therefore, the clamp rod 3 rotates from the locked position to the unlocked position as shown in FIG. 3 by the component force in the rotational direction to the guide pin 51 accompanying the engagement with the inclined engaging groove portion 54. In this way, the lower clamp 22 can be detached from the automatic clamping device A with the clamp rod 3 held in the unlocked position.
[0019]
When the lower clamp 22 is fixed by the automatic clamping device A, the lower clamp 22 is set with the clamp rod 3 held in the unlocked position (shown in FIG. 3), and the cam lever 43 is moved by the air cylinder 49 as described above. When the actuator is operated downward, the cylindrical cam 50 slides downward in conjunction with this operation. By the sliding of the cylindrical cam 50, the inclined engaging groove portion 54 of the cam groove 52 slides on the guide pin 51, and the clamp rod 3 rotates from the unlocked position to the locked position (shown in FIG. 2). By the operation of 43, the spacer 41 slides downward from the biasing force receiving position to the spring separation position (shown in FIG. 1). Thereby, the urging force of the laminated disc spring 40 is applied to the clamp rod 3, and the locking portion 30 can be engaged with the locking groove 23.
[0020]
As described above, in order to receive the urging force of the laminated disc spring 40 by the operation of the cam lever 43 provided with the cam 42 at the tip, the lever 30 acts on the locking portion 30 with a low output light driving force, that is, air. It can be released by the cylinder 49.
The clamp rod 3 is rotated between the unlock position and the lock position by the sliding of the cam groove 52 and the guide pin 51 due to the reciprocating movement of the cylindrical cam 50. Since it is made to perform in a state, the driving force can be reduced. In addition, since the operation of the cylindrical cam 50 is interlocked with the operation of the cam lever 43, the air cylinder 49, which is the driving means of the cam lever 43, can also be used as the driving means of the cylindrical cam 50, and one air cylinder 49 is used as the cam lever 43. And the cylindrical cam 50 can be used as a common drive means.
[0021]
As mentioned above, although embodiment of this invention was described with drawing, a specific structure is not limited to this embodiment.
For example, as a driving means, a linear actuator using hydraulic pressure or electricity can be used in addition to an air cylinder, and a cam lever and a plate cam may be manually operated.
The automatic clamping device of the present invention can also be used for fastening upper and lower molds in a tire vulcanizing device.
[0022]
【The invention's effect】
As described above, in the automatic clamping device of the present invention, a low output light driving force, for example, an air cylinder is used as a driving means in order to release the locking portion by the lever action of the cam lever. it can.
In addition, since the locking and unlocking of the clamp rod is performed in the unlocked state, the driving force can be reduced, and the operation is linked to the operation of the cam lever, so one drive The means can be used as a common drive means for the engagement mechanism and the lock mechanism. Therefore, the cost can be reduced and the structure can be simplified as compared with the case where separate driving means are used for the engagement mechanism and the lock mechanism, respectively.
[Brief description of the drawings]
FIG. 1 is an overall cross-sectional view of an automatic clamping device that is an embodiment of the present invention and is used for fixing a ladder in a tire vulcanizing device.
FIG. 2 is a cross-sectional view showing an operating state of the automatic clamping device.
FIG. 3 is a cross-sectional view showing an operating state of the automatic clamping device.
FIG. 4 is a development view of a cylindrical cam provided in the automatic clamping device.
[Explanation of symbols]
2 Prader 3 Clamp rod 4 Engagement mechanism 5 Lock mechanism 10 Upper die 11 Lower die 12 Bag head 13 Center post 14 Through hole 21 Upper clamp 22 Lower clamp 23 Locking groove 30 Locking portion 31 Lower end large diameter portion 40 Lamination Belleville spring 41 Spacer 42 Cam 43 Cam lever 44 Cylinder cylinder 45 Washer 46 Shaft 47 Cam surface 48 Bearing 49 Air cylinder 50 Cylindrical cam 51 Guide pin 52 Cam groove 53 Relief groove 54 Inclined engagement groove 59 Bracket A Automatic clamp device T Raw tire

Claims (1)

An engagement mechanism comprising a clamp rod having a locking portion formed at the tip, and reciprocating the clamp rod in the axial direction to engage or release the locking portion with respect to the clamped body, and the locking portion An automatic clamping device having a lock mechanism for positioning the locking portion in a locked position and an unlocked position with respect to the clamped body by reciprocatingly rotating the clamp rod in the released state of
The engagement mechanism includes a spring member that urges the clamp rod to engage the locking portion with the clamped body, and a spacer that receives the biasing force of the spring member and releases the locking portion from the clamped body. A cam lever having a cam formed at the tip thereof for reciprocating the spacer between the spring separation position and the urging force receiving position;
The lock mechanism is formed on the plate cam so that a plate cam that reciprocates in the axial direction of the clamp rod in conjunction with the operation of the cam lever and a guide member protruding from the clamp rod are slidably fitted. Cam groove is provided,
The cam groove releases the movement of the plate cam by releasing the engagement with the guide member until the spacer moves from the spring separation position to the biasing force receiving position by the operation of the cam lever and releases the locking portion. The escape groove portion and the inclined engagement groove portion that engages with the guide member as the plate cam moves in the released state and rotates the clamp rod from the lock position to the unlock position are formed. Automatic clamping device in tire vulcanizer.

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