JP2014028476A - Mold clamping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold clamping device which can improve the durability of a toggle mechanism.SOLUTION: A mold clamping device includes a toggle mechanism which comprises a link mechanism whose both ends are connected to a pressure receiving plate 10 and a movable plate 60 and which bends and stretches to make the movable plate 60 approach or separate from a fixed plate. The toggle mechanism is a double link toggle mechanism equipped with a pair of link arms 33 in the width direction of the movable plate 60. The other ends of the pair of link arms 33 are connected to both ends of a shaft-shaped toggle pin 35 supported by the movable plate 60. The movable plate 60 is connected to the toggle pin 35 between the pair of link arms 33. A space P is formed between the movable plate 60 and both ends of the toggle pin 35 located outside the other ends of the pair of link arms 33. The movable plate 60 and the toggle pin 35 located inside the other ends of the pair of link arms 33 are connected to each other in a tight contact state.

Description

  The present invention includes a pressure receiving plate supported by a machine base, a fixed plate disposed opposite to the pressure receiving plate, a movable plate capable of approaching and separating from the fixed plate, and one end of the pressure receiving plate. A toggle mechanism comprising a link mechanism that is supported and supported at the other end on the back side of the movable platen and separates the movable platen from the fixed platen when bent and moves the movable platen to the fixed platen when extended. It relates to a fastening device.

  2. Description of the Related Art Conventionally, a mold clamping device having a toggle mechanism including a link mechanism for moving a movable plate toward and away from a fixed plate is well known between a pressure platen and a movable platen.

  In addition, this toggle mechanism is known, for example, that uses a shaft-shaped toggle pin to connect the pressure platen and the link, and uses a detent structure so that the toggle pin does not rotate when the link mechanism (double link) is bent or extended. (For example, refer to Patent Document 1).

Japanese Patent No. 3728232

  However, in the above-described mold clamping apparatus, the pressure receiving plate and the double link lever are alternately positioned, and the toggle pin, the pressure receiving plate, the toggle pin, and the double link lever are in close contact with each other.

  This is because, in the relationship between the inner diameter of the hole formed in the pressure platen and the lever of the double link and the diameter of the toggle pin through which the toggle pin penetrates, if the inner diameter is smaller than the diameter, the toggle pin naturally does not penetrate, and the inner diameter is smaller than the diameter. If it is too large, it will be caused by looseness when the toggle mechanism expands and contracts. Therefore, the accuracy of the degree to which the relationship between the inner diameter and the diameter strictly matches is required.

  However, if the pressure receiving plate and the lever are in close contact with the toggle pin, for example, the load from the pressure receiving plate is also applied to the outside of the two levers, so the load is concentrated on the center side of the movable platen. It was difficult.

  As a result, the balance between the mold clamping state of the movable plate mold (movable mold) and the fixed plate mold (fixed mold) is lost, which causes a problem that the quality of the molded product is not stable. End up.

  Therefore, the present invention connects the movable arm to the movable plate with the load from the link arm concentrated on the center side from both ends of the toggle pin, and even if the balance of the both ends of the toggle pin is broken, the presence of a gap causes the aging at both ends of the toggle pin. It is an object of the present invention to provide a mold clamping device that can hardly cause deterioration and can improve the durability of a toggle mechanism.

  In order to solve the above-described problems, a mold clamping device according to the present invention includes a pressure plate supported by a machine base, a fixed plate fixed to the machine table and arranged to face the pressure plate, and the pressure plate. A plurality of shaft-shaped tie bars that are supported at one end and fixed at the other end to the fixed platen, a movable plate that can be moved toward and away from the fixed platen, and one end supported by the pressure platen and A toggle mechanism composed of a link mechanism that supports the other end on the back side of the movable plate and separates the movable plate from the fixed plate when bent and moves the movable plate close to the fixed plate when extended. In the mold clamping device, the toggle mechanism is a double link toggle mechanism having a pair of link arms in the width direction of the movable platen, and the other end of the pair of link arms has a shaft-like toggle pin supported by the movable platen. Connected to both ends The movable plate is connected to the toggle pin between the pair of link arms, and a gap is formed between both ends of the toggle pin outside the other end of the pair of link arms and the movable plate, The toggle pin inside the other end of the pair of link arms and the movable plate are connected in close contact with each other.

  According to the mold clamping device of the present invention, the load from the link arm is connected to the movable plate in a state where the load is concentrated from the both ends of the toggle pin to the center side, and even if the balance at both ends of the toggle pin is broken, Aging deterioration at both ends can be made difficult to occur, and the durability of the toggle mechanism can be improved.

  Further, in the mold clamping device of the present invention, a concave plate is formed in the movable platen, a notch is formed at both ends of the toggle pin, and the anti-rotation plate straddles between the concave portion and the notch in a state where the concave portion and the notch are aligned. Is fixed to the movable platen.

  According to the mold clamping device of the present invention, it is possible to secure a clearance that allows the toggle pin to be bent (curved) at the same time as securing the rotation prevention of the toggle pin.

  The mold clamping device of the present invention is connected to the movable plate in a state where the load from the link arm is concentrated from the both ends of the toggle pin to the center side, and even if the balance of both ends of the toggle pin is lost, there is a gap between the two ends of the toggle pin. As a result, it is possible to make it difficult to cause aging deterioration and to improve the durability of the toggle mechanism.

It is a front view of the mold clamping device concerning one embodiment of the present invention. It is a rear view of the mold clamping device concerning one embodiment of the present invention. It is a perspective view of the mold clamping device of one embodiment of the present invention. It is a top view of the mold clamping device of one embodiment of the present invention. It is sectional drawing of the principal part of the pressure receiving board applied to the mold clamping apparatus of one Embodiment of this invention. It is a perspective view of the principal part of the toggle pin connection part applied to the mold clamping apparatus of one Embodiment of this invention. It is sectional drawing of the principal part of the toggle pin connection part applied to the mold clamping apparatus of one Embodiment of this invention. It is a perspective view of the toggle pin applied to the mold clamping device of one embodiment of the present invention. It is a perspective view of a movable mold applied to the mold clamping device of one embodiment of the present invention. It is sectional drawing of the movable mold | type applied to the mold clamping apparatus of one Embodiment of this invention.

  Next, a mold clamping device according to an embodiment of the present invention will be described with reference to the drawings. The following embodiments are preferred specific examples of the mold clamping device of the present invention, and may have various technically preferred limitations. However, the technical scope of the present invention is particularly limited to the present invention. As long as there is no description which limits, it is not limited to these aspects. In addition, the constituent elements in the embodiments shown below can be appropriately replaced with existing constituent elements and the like, and various variations including combinations with other existing constituent elements are possible. Therefore, the description of the embodiment described below does not limit the contents of the invention described in the claims.

  1 is a front view of a mold clamping device according to an embodiment of the present invention, FIG. 2 is a rear view of the mold clamping device according to an embodiment of the present invention, and FIG. 3 is a diagram of the mold clamping device according to an embodiment of the present invention. FIG. 4 is a plan view of a mold clamping device according to an embodiment of the present invention, FIG. 5 is a cross-sectional view of a main part of a pressure receiving plate applied to the mold clamping device according to an embodiment of the present invention, and FIG. The perspective view of the principal part of the toggle pin connection part applied to the mold clamping apparatus of one Embodiment of this invention, FIG. 7 is sectional drawing of the principal part of the toggle pin connection part applied to the mold clamping apparatus of one Embodiment of this invention, FIG. 8 is a perspective view of a toggle pin applied to the mold clamping device of one embodiment of the present invention, FIG. 9 is a perspective view of a movable mold applied to the mold clamping device of one embodiment of the present invention, and FIG. 10 is the present invention. It is sectional drawing of the movable mold | type applied to the mold clamping apparatus of one Embodiment.

(Overall schematic configuration)
1 to 4, a toggle type mold clamping device 1 in an injection molding machine includes a pressure receiving plate 10 positioned and fixed to a machine base 2, a driving unit 20 disposed on the pressure receiving plate 10, and a pressure receiving plate 10. A toggle mechanism 30 that is disposed and bends and stretches by driving of the driving unit 20, a fixed plate 40 that is fixed to the machine base 2 so as to face the pressure receiving plate 10, and a pressure receiving plate that is positioned near the four corners of the fixed platen 40. Four tie bars 50 installed between the board 10 and the fixed board 40, a movable board 60 that passes through the tie bar 50 so as to be guided and is displaced between the pressure receiving board 10 and the fixed board 40, and a movable board And an ejecting portion 70 for releasing the product after injection molding provided on the board 60.

(Specific configuration of the pressure receiving plate 10)
The pressure receiving board 10 is stopped at a predetermined position of the rail 3 provided on the machine base 2. The predetermined position of the pressure receiving plate 10 is determined according to the size of the mold composed of the movable mold 4 and the fixed mold 5 (illustrated by phantom lines only in FIG. 1), and the mold clamping force is changed or the mold is replaced. The position is adjusted by moving forward and backward along the rail 3 each time. The limit of the forward position or the backward position of the pressure receiving plate 10 at that time is detected via the position switches 6 and 7. The pressure receiving plate 10 supports one end 51 of the tie bar 50 in the vicinity of its four corners. In the present embodiment, as shown in FIG. 5, after one end 51 of the tie bar 50 is passed through the pressure receiving plate 10, a screw groove (not shown) formed in the one end 51 and outside the pressure receiving plate 10. Positioning along the axial direction is performed by the adjusting nut 12 to be screwed. In the adjustment nut 12, an annular contact portion 12 b is integrally formed on an inner end surface 12 a that is in pressure contact with the pressure receiving plate 10 so as to surround the axis of the one end 51. The adjusting nut 12 is provided with a nut holding member 13 that is screwed to the pressure receiving plate 10 on the outer periphery thereof, and a small gear 14 that constitutes a mold thickness adjusting device is screwed to the outer end surface 12c.

(Specific configuration of the drive unit 20)
The drive unit 20 includes a drive source 21 such as an electric motor provided on the back surface of the pressure receiving plate 10, a drive pulley 23 provided on the output shaft 22 of the drive source 21, and an endless belt stretched over the drive pulley 23. And a screw shaft 24 that is rotated by rotation of a driven pulley (both not shown) that is rotated by the pivoting movement. The tip of the screw shaft 24 protrudes toward the movable platen 60. In addition, since this drive part 20 is well-known, the system of the concrete structure etc. is abbreviate | omitted.

(Specific configuration of toggle mechanism 30)
The toggle mechanism 30 is constructed so as to be able to bend and stretch between the pressure receiving plate 10 and the movable platen 60, and bends and stretches as the drive unit 20 is driven to move the movable platen 60 toward and away from the fixed platen 40. Specifically, the toggle mechanism 30 includes a crosshead 31 that is screwed with the screw shaft 24 and moves forward and backward along the axial direction in conjunction with the rotation of the screw shaft 24, and independent from the crosshead 31 in the vertical direction. A pair of upper and lower operation links 32 extending, one pair (left and right) fixed-side link arms 33 supported on one end on the pressure receiving plate 10, and one pair (left and right) on one end supported on the movable plate 60. ) Driven-side link arm 34.

  The base end of the working link 32 is integrally connected to the cross head 31, and the middle portion of the fixed side link arm 33 is pivotally supported at the tip end thereof.

  The fixed side link arm 33 is substantially Y-shaped in plan view, and one end thereof is pivotally supported on the pressure receiving plate 10 via a toggle pin 35 so as to be rotatable. Further, one end of the driven side link arm 34 is pivotally supported on each other end of the fixed side link arm 33. Note that one end of the driven side link arm 34 is positioned between the fixed side link arm 33 branched in a Y-shape.

  The other end of the driven side link arm 34 is pivotally supported by the movable platen 60 via a toggle pin 35 so as to be rotatable. In the present embodiment, the toggle mechanism 30 is configured such that when the fixed side link arm 33 and the driven side link arm 34 change from the bent state to the extended state, the tip of each driven side link arm 34 positioned above and below is The load is inclined so as to be directed toward the center of the movable platen 60 and the load is concentrated.

  The toggle pin 35 employs substantially the same connection structure in the connection between the pressure receiving platen 10 and the fixed side link arm 33 and the connection between the movable platen 60 and the driven side link arm 34. Hereinafter, a connection structure between the pressure receiving plate 10 and the fixed side link arm 33 by the toggle pin 35 will be described.

  As shown in FIGS. 6 and 7, on the inner side of the pressure receiving plate 10, a pair of upper and lower connection base portions 15 projecting toward the movable platen 60 are integrally formed. A through hole 15 a through which the toggle pin 35 penetrates is formed at the protruding end portion of the coupling base portion 15. A pair of recesses 15 b are formed at the projecting end of the coupling base 15 so as to open to the end face and into which one end of the fixed side link arm 33 is inserted. A stepped portion 15 c is formed on the side surface of the protruding end portion of the connecting table 15. A female screw hole 15d is formed on the side surface of the step portion 15c.

  As shown in FIG. 8, the toggle pin 35 has a diameter at both ends 35b smaller than that at the center 35a by cutting or the like. Further, the both end portions 35b are formed with notched portions 35c that are notched across the end surface and the peripheral surface. Further, one end of the fixed-side link arm 33 is pivotally supported in the portion exposed to the recess 15b near both ends of the central portion 35a. For example, a carbon bush 36 is interposed between one end of the fixed side link arm 33 and the toggle pin 35. In addition, the toggle pin 35 is fixed to the connection base 15 in a state of retaining and preventing rotation by fixing the fixing plate 37 to the connection base 15 with a bolt 38. In the present embodiment, the toggle pin 35 penetrates the through hole 15a, and as shown in FIG. 6, the notch 35c is made to coincide with the step 15c. In this state, the fixing plate 37 is straddled between the notch portion 35c and the step portion 15c, and the bolt 38 is screwed into the female screw hole 15d. Thereby, the toggle pin 35 can be fixed to the connection base part 15 in the state of retaining and preventing rotation.

  The diameter of the central portion 35a is the same as the inner diameter of the through hole 15a. Accordingly, as shown in FIG. 7, a gap P having a difference in radius is generated between the both end portions 35b and the through hole 15a. Here, the length in the axial direction of the small-diameter portion in both end portions 35b is set to be equal to or longer than the length in the axial direction of the connecting base portion 15 outside the concave portion 15b. As a result, the toggle pin 35 and the pressure receiving plate 10 are sandwiched between the center portion 35a of the toggle pin 35 and a portion closer to the center than the both end portions 35b which are small diameter portions, that is, the pair of left and right fixed side link arms 33. It is in contact only with the connecting base 15 of the part.

(Specific configuration of fixed platen 40)
The stationary platen 40 is fixed to the machine base 2, and the position thereof cannot be adjusted so as to be a reference for the mold clamping device 1. The stationary platen 40 supports the stationary mold 5 on the surface of the mold support part 41. Further, a nozzle insertion hole 42 (see FIG. 3) through which the tip of the injection nozzle 8 faces is penetrated in the center of the fixed platen 40, and the fixed die 5 is inserted by inserting the injection nozzle 8 from the back side of the fixed platen 40. Touch the nozzle.

  The movable mold 4 and the fixed mold 5 described above constitute a mold having a mold cavity. The injection nozzle 8 can be moved back and forth with respect to the fixed platen 40. The injection nozzle 8 moves forward to the fixed platen 40 and touches the fixed die 5 with a nozzle to inject and fill the molten resin into the mold cavity.

(Specific configuration of tie bar 50)
One end 51 of the tie bar 50 is supported by the pressure receiving plate 10 so as to be adjustable as described above, and the other end 52 is fixed to the stationary platen 40 while penetrating the movable platen 60. At this time, the tip of the other end 52 is fixed by the nut 43 while penetrating the fixed platen 40.

  Further, each tie bar 50 is formed with a constricted portion 53 in which a part of the diameter is smaller than the other diameters. The constricted portion 53 is located between the pressure receiving plate 10 and the movable platen 60 and is formed in a range closer to the pressure receiving plate 10 than the movable range of the movable platen 60 in the present embodiment.

  A safety bar 54 is provided between the pressure receiving plate 10 and the movable plate 60 in parallel with the tie bar 50.

  The safety bar 54 prevents the movable platen 60 from closing and closing when the door is opened. The direction of the movable platen 60 approaching the fixed platen 40 (the toggle mechanism 30 extends) is forward, and the movable platen 60 is fixed platen 40. When the direction away from (the toggle mechanism 30 is bent) is the rear, both ends closed recesses 54a having step surfaces perpendicular to the axis and the step inclined so that the front side expands forward A one-side closed recess 54b having a surface and a step surface whose rear side is orthogonal to the axis is formed.

  The tip 54 c of the safety bar 54 has a screw shaft structure and is engaged with the movable platen 60. The rear end 54d of the safety bar 54 is supported by a locking device 55 provided in the pressure receiving plate 10. In addition, since the well-known technique (for example, patent 4315446 etc.) is applied to the specific structure and effect | action of this safety rod 54 and the locking device 55, detailed description is abbreviate | omitted here.

(Specific configuration of movable platen 60)
The movable platen 60 is provided on the machine base 2 so as to be slidable. In this embodiment, the movable board 60 is supported by the machine base 2 via a slider 9 that is displaced along the rail 3. The movable platen 60 supports the movable die 4 with a die support portion 61 facing the die support portion 41 of the fixed platen 40. As shown in FIGS. 9 and 10, the movable platen 60 is formed with an eject through hole 62 that opens to the mold support 61. In the movable platen 60, through holes 63 of tie bars 50 are formed at four corners. On the back surface side of the movable platen 60, an insertion hole 64 into which an operation unit 77 of an eject unit 70 described later is inserted, a mounting seat 65 to which the operation unit 77 is fixed at a side of the insertion hole 64, An upper wall portion 67 and a lower wall portion 68 that form a storage space 66 of the operation unit 77 between the eject through hole 62 and the insertion hole 64, and an upper wall portion 67 and a lower wall so as to protrude toward the pressure receiving plate 10. And a connecting stand portion 69 formed integrally with the portion 68. The slider 9 has a known configuration that can adjust the position and height of the movable platen 60 along the direction in which the rail 3 is laid.

  The mounting seat 65 is integrally provided with a base portion 65a that surrounds both sides of the insertion hole 64 and a seat portion 65b that protrudes from above and below the base portion 65a toward the pressure receiving plate 10, and has a substantially U-shape when viewed from the front. Yes. The base portion 65a and the seat portion 65b are integrally formed so as to protrude from the back surface of the movable platen 60 (the same as the opening end surface of the insertion hole 64 on the pressure receiving plate 10 side). At this time, the connecting base portion 69 and the mounting seat portion 65 as the other end support portion of the toggle mechanism 30 are integrally formed as the movable platen 60, but are independent protruding structures so as not to be functionally connected. Are arranged and formed. This also serves as a reinforcing structure that suppresses the opening of the connecting base 69 due to the applied pressure when the toggle mechanism 30 is extended.

  The upper wall portion 67 and the lower wall portion 68 are thick inclined portions 67a and 68a that are inclined so as to increase in thickness toward the outside in a portion continuous from the mold support portion 61 toward the back surface side with the connecting base portion 69. Is formed. The upper surface 67 b and the lower surface 68 b of the upper wall portion 67 and the lower wall portion 68 are the bottom surfaces of the recessed portions 67 c and 68 c located inside the outer periphery of the mold support portion 61. The bottom surfaces (upper surface 67b and lower surface 68b) are located on the same plane (see the two-dot chain line in FIG. 10) including the axis Q of the through hole 69a through which the toggle pin 35 passes. Further, between the inner sides of the upper wall portion 67 and the lower wall portion 68 and the inner surface of the mold support portion 61, thick inclined portions 67d and 68d inclined in the expanding direction from the center side of the mold support portion 61. Is formed.

  A through hole 69 a through which the toggle pin 35 passes is formed at the protruding end portion of the coupling base portion 69. A pair of recesses 69 b are formed at the projecting end of the coupling base 69 and open to the end face thereof and into which one end of the fixed side link arm 33 is inserted. A stepped portion 69 c is formed on the side surface of the protruding end portion of the connecting base portion 69. A female screw hole 69d is formed on the side surface of the stepped portion 69c. Note that the support structure of the toggle pin 35 in the connection base 69 is basically the same as that of the connection base 15.

(Specific configuration of eject unit 70)
The eject unit 70 includes an eject motor 71 provided on the back surface of the movable platen 60, a drive pulley 73 provided on the output shaft 72 of the eject motor 71, and a driven pulley provided in the center of the drive pulley 73 and the movable platen 60. 74, an endless belt 75 stretched around 74, and an operating unit 77 having an eject pin 76 that moves forward and backward by the rotation of the driven pulley 74.

  In the ejecting process, the ejecting unit 70 is driven and controlled, and the ejecting pin 71 is advanced by the operation of the ejecting motor 71, and the molded product in the mold cavity is ejected.

(Specific action)
In the above configuration, when the drive source 21 is driven, the cross head 31 advances while being guided by the screw groove of the screw shaft 24, and at the same time, the operation link 32 advances integrally with the cross head 31. When the operating link 32 advances, the fixed side link arm 33 and the driven side link arm 34 change from the bent state to the extended state.

  When the fixed side link arm 33 and the driven side link arm 34 extend, the movable platen 60 is guided by the tie bar 50 and displaced toward the fixed platen 40, and the movable die 4 and the fixed die 5 are clamped.

  By the way, the mold clamping force when the toggle mechanism 30 is extended is caused by the presence of the gap P in both the end portions 35b of the toggle pin 35 of the pressure receiving plate 10 and the both ends 35b of the toggle pin 35 of the movable platen 60. Load transmission at the portion (both end portions 35b) is not performed, and load transmission can be performed intensively only at the central portion 35a of the toggle pin 35.

  Therefore, the mold clamping force when the toggle mechanism 30 is extended is, for example, from the both end portions 35b of the toggle pin 35 of the movable plate 60 to the central portion 35a in the state where the load from the driven side link arm 34 is concentrated to the movable plate 60. In addition to being connected (transmitted), even if the both ends 35b of the toggle pin 35 are out of balance, the presence of the gap P can make it difficult for the both ends 35b of the toggle pin 35 to deteriorate over time. Can also be improved.

  At this time, the toggle mechanism 30 is configured such that when the fixed side link arm 33 and the driven side link arm 34 change from the bent state to the extended state, the tip of each driven side link arm 34 positioned above and below the movable platen 60. Since it inclines so that it may face a center direction, a load is added to the front end side of the connection stand part 69 in the direction which pushes and spreads mutually.

  Here, on the back side of the connecting base part 69, a thick inclined part 67a that inclines so as to increase in thickness toward the outside in a portion continuous with the connecting base part 69 from the mold support part 61 toward the back side. , 68a are formed. As a result, the concave portions 67c and 68c are formed, thereby contributing to the weight reduction of the movable platen 60, and the load against the reaction force described above can be received by the thick inclined portions 67a and 68a, thereby ensuring the load resistance. be able to.

  Further, since both end portions 35b of the toggle pin 35 are supported by the pressure receiving plate 10 and the movable plate 60 in a state of being prevented from being rotated and prevented from being detached by the fixed plate 37, a clearance P that allows the bending (curvature) of the toggle pin 35 to be allowed. Can be secured.

  Further, the mold clamping force when the toggle mechanism 30 is extended is fixed by fixing the one end 51 of the tie bar 50 with the adjusting nut 12 and the other end 52 of the tie bar 50 with the nut 43, respectively. Can be easily secured.

  At this time, one end 51 of the tie bar 50 is fixed with the adjusting nut 12 and an annular contact portion 12b provided on the inner end surface 12a of the tie bar 50 so as to surround the axis of the tie bar 50 is brought into pressure contact with the pressure receiving plate 10 to thereby fix the tie bar 50. The surface pressure on one end 51 side of the tie bar 50 can be secured to improve the loosening prevention effect, and the tension on the other end 52 side of the tie bar 50 can be made uniform over the four corners of the fixed platen 40.

  Furthermore, the tie bar 50 is formed with a constricted portion 53 in a range closer to the pressure receiving plate 10 than the movable range of the movable platen 60. The tie bar 50 has one end 51 supported by the pressure receiving platen 10 and the other end 52 fixed to the fixed platen 40. For this reason, in the mold clamping state where the toggle mechanism 30 is extended and the movable platen 60 is pressurized toward the fixed platen 40, a reaction force from the fixed platen 40 is generated in the tie bar 50.

  Here, the extension of the tie bar 50 against a disturbance (for example, the temperature rises by 1 ° C.) is set to 0.01 mm, and a mold clamping force of 15 t is generated using the tie bar 50 (shaft diameter 40Φ) having the same diameter without the constricted portion 53. The extension of the tie bar 50 when it was made was 0.146 mm.

Therefore, the sensitivity of the disturbance that the clamping force receives is
(0.01 / 0.146) * 100 ≒ 7%
It becomes.

  On the other hand, when a clamping force of 15 t was generated using a tie bar 50 in which a constricted portion 53 having a shaft diameter 30Φ was formed on a part of the same shaft diameter 40Φ, the extension of the tie bar 50 was 0.183 mm.

Therefore, the sensitivity of the disturbance that the clamping force receives is
(0.01 / 0.183) * 100 ≒ 5%
Thus, the sensitivity can be made insensitive to the tie bar 50 having the same diameter. This is because the relatively small mold clamping device 1 of 15t class (20t or less) is easily affected (large) by the disturbance, but by forming the constricted portion 53, the sensitivity to the disturbance is made insensitive. It was difficult to be affected by this.

DESCRIPTION OF SYMBOLS 1 ... Mold clamping apparatus 2 ... Machine stand 3 ... Rail 4 ... Movable type 5 ... Fixed type 6 ... Position switch 7 ... Position switch 8 ... Injection nozzle 9 ... Slider 10 ... Pressure receiving plate 12 ... Adjustment nut 12a ... Inner end surface 12b ... Ring shape Contact part 12c ... Outer end face 13 ... Nut holding member 14 ... Small gear 15 ... Connection base part 15a ... Through hole 15b ... Recess 15c ... Step part 15d ... Female screw hole 20 ... Drive part 21 ... Drive source 22 ... Output shaft 23 ... Drive pulley 24 ... Screw shaft 30 ... Toggle mechanism 31 ... Cross head 32 ... Actuation link 33 ... Fixed side link arm 34 ... Driven side link arm 35 ... Toggle pin 35a ... Central part 35b ... Both ends 35c ... Notch part 36 ... Carbon bush 37 ... Fixing plate 38 ... Bolt 40 ... Fixing plate 41 ... Mold support part 42 ... Nozzle insertion hole 43 ... Nut 50 ... Tie bar 51 ... One end 52 ... Other end 53 ... Part 54 ... Safety rod 54a ... Both ends closed recess 54b ... One side closed recess 54c ... Front end 54d ... Rear end 55 ... Locking device 60 ... Movable plate 61 ... Mold support 62 ... Eject through hole 63 ... Through hole 64 ... Insertion hole 65 ... Mounting seat part 65a ... Base part 65b ... Seat part 66 ... Storage space 67 ... Upper wall part 67a ... Thick wall inclined part 67b ... Upper surface 67c ... Recessed part 67d ... Thick wall inclined part 68 ... Lower wall Portion 68a ... Thick wall inclined portion 68b ... Lower surface 68c ... Recessed portion 68d ... Thick wall inclined portion 69 ... Connection base portion 69a ... Through hole 69b ... Recessed portion 69c ... Stepped portion 69d ... Female screw hole 70 ... Ejection portion 71 ... Ejector motor 72 ... Output shaft 73 ... Driving pulley 74 ... Driving pulley 75 ... Endless belt 76 ... Eject pin 77 ... Operating unit P ... Gap Q ... Axis center Y ... No plan view

Claims (2)

A pressure plate supported by the machine base;
A stationary platen fixed to the machine base and disposed opposite the pressure platen;
A plurality of shaft-shaped tie bars, one end of which is supported by the pressure plate and the other end of which is fixed to the fixed plate;
A movable plate capable of approaching and moving away from the fixed plate;
A link having one end supported by the pressure receiving plate and the other end supported on the rear side of the movable platen, which separates the movable platen from the fixed platen at the time of bending and links the movable platen to the fixed platen at the time of extension. Toggle mechanism consisting of mechanism,
In a mold clamping device comprising:
The toggle mechanism is a double link toggle mechanism having a pair of link arms in the width direction of the movable platen,
The other ends of the pair of link arms are connected to both ends of a shaft-like toggle pin supported by the movable platen,
The movable board is connected to the toggle pin between the pair of link arms,
A gap is formed between both ends of the toggle pin outside the other end of the pair of link arms and the movable platen, and the toggle pin inside the other end of the pair of link arms and the movable platen are in close contact with each other. A mold clamping device characterized by being connected in a state. A recess is formed in the movable platen,
Notches are formed at both ends of the toggle pin,
The mold clamping device according to claim 1, wherein a rotation stop plate straddling the concave portion and the notch is fixed to the movable platen in a state where the concave portion and the notch are aligned.

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