CN108688117B - Injection molding machine - Google Patents

Abstract

An injection molding machine, comprising: a 1 st stopper inserted into one of a plurality of 1 st fitting grooves arranged in a moving direction of a movable member, and abutting against a 1 st movement stop surface of the 1 st fitting groove, thereby stopping the movement of the movable member; and a 2 nd stopper inserted into one of a plurality of 2 nd fitting grooves arranged in the moving direction of the movable member and abutting a 2 nd movement stop surface of the 2 nd fitting groove to stop the movement of the movable member, wherein a plurality of stop positions of the movable member based on the 1 st stopper are arranged at intervals in the moving direction of the movable member, a plurality of stop positions of the movable member based on the 2 nd stopper are arranged at intervals in the moving direction of the movable member, and a stop position of the movable member based on the 2 nd stopper exists between the plurality of stop positions of the movable member based on the 1 st stopper.

Description

Injection molding machine

Technical Field

The present application claims priority based on japanese patent application No. 2017-068006, applied on 3/30/2017. The entire contents of this Japanese application are incorporated by reference into this specification.

The present invention relates to an injection molding machine.

Background

The vertical injection molding machine described in patent document 1 includes a left rod member and a right rod member that are integrated with a movable platen and move up and down together with the movable platen. The left and right side rod members can be inserted through the vertical through holes of the fixed die plate. The left and right rod members have saw-toothed portions, and a plurality of locking step portions are formed at the saw-toothed portions. When the 1 st safety door is opened from the closed state, the 1 st locking lever engages with the locking stepped portion of the left lever member, and immediately prohibits the movable die plate from moving in the die closing direction. When the 2 nd safety door is opened from the closed state, the 2 nd locking lever engages with the locking stepped portion of the left lever member, and immediately prohibits the movable die plate from moving in the die closing direction. When the 3 rd safety door is opened from the closed state, the 3 rd locking lever engages with the locking stepped portion of the right lever member, and immediately prohibits the movable die plate from moving in the die closing direction.

Patent document 1: japanese patent laid-open publication No. 2006-346933

In order to emergency stop the movable member, the stopper is inserted into one of a plurality of fitting grooves arranged in the moving direction of the movable member, and the wall surface of the fitting groove is brought into abutment with the stopper. The stopper is inserted into the fitting groove in a direction orthogonal to the moving direction of the movable member.

In order to shorten the moving distance of the movable member from the start of the insertion of the stopper to the stop of the movable member, the pitch of the fitting groove may be shortened, but since the width of the fitting groove is narrowed, the wall surface of the fitting groove may come into contact with the stopper and the insertion of the stopper may be completed before the stopper is sufficiently inserted into the deep portion of the fitting groove.

Therefore, the stopper may not be sufficiently inserted into the depth of the fitting groove.

Disclosure of Invention

The present invention has been made in view of the above-described problems, and a main object thereof is to provide an injection molding machine capable of achieving both shortening of a moving distance of a movable member from insertion of a stopper to stop of the movable member and securing of an insertion amount of the stopper.

In order to solve the above problem, according to an aspect of the present invention, there is provided an injection molding machine including:

a 1 st stopper inserted into one of a plurality of 1 st fitting grooves arranged in a moving direction of a movable member, and abutting against a 1 st movement stop surface of the 1 st fitting groove, thereby stopping the movement of the movable member; and

a 2 nd stopper inserted into one of a plurality of 2 nd fitting grooves arranged in the moving direction of the movable member and brought into contact with a 2 nd movement stop surface of the 2 nd fitting groove to stop the movement of the movable member,

a plurality of stop positions of the movable member based on the 1 st stopper are arranged at intervals in the moving direction of the movable member,

a plurality of stop positions of the movable member based on the 2 nd stopper are arranged at intervals in the moving direction of the movable member,

there is a stop position of the movable member based on the 2 nd stopper between a plurality of stop positions of the movable member based on the 1 st stopper.

ADVANTAGEOUS EFFECTS OF INVENTION

According to an aspect of the present invention, there is provided an injection molding machine capable of achieving both shortening of a moving distance of a movable member from insertion of a stopper to stop of the movable member and securing of an insertion amount of the stopper.

Drawings

Fig. 1 is a diagram showing a state at the end of mold opening of an injection molding machine according to an embodiment.

Fig. 2 is a diagram showing a state of the injection molding machine according to an embodiment when clamping a mold.

Fig. 3 is a view showing a descent stop state of the upper platen by the 1 st stopper out of the 1 st stopper and the 2 nd stopper according to embodiment 1.

Fig. 4 is a view showing a descent stop state of the upper platen by the 2 nd stopper out of the 1 st stopper and the 2 nd stopper according to embodiment 1.

Fig. 5 is a view showing a descent stop state of the upper platen by the 1 st stopper out of the 1 st stopper and the 2 nd stopper according to embodiment 2.

Fig. 6 is a view showing a state where the upper platen is stopped from being lowered by the 2 nd stopper out of the 1 st stopper and the 2 nd stopper according to embodiment 2.

Fig. 7 is a view showing a descent stop state of the upper platen by the 1 st stopper out of the 1 st stopper and the 2 nd stopper according to embodiment 3.

Fig. 8 is a view showing a state where the upper platen is stopped from being lowered by the 2 nd stopper out of the 1 st stopper and the 2 nd stopper according to embodiment 3.

Fig. 9 is a view showing a state where the upper platen is stopped by the 1 st stopper out of the 1 st stopper and the 2 nd stopper according to embodiment 4.

Fig. 10 is a view showing a state where the upper platen is stopped from being lowered by the 2 nd stopper out of the 1 st stopper and the 2 nd stopper according to embodiment 4.

Description of the symbols

Fr-frame, 100-mold clamping apparatus, 110-top platen (movable part), 510-1 st rod, 511-1 st fitting groove, 512-1 st movement stop surface, 513-1 st guide surface, 520-1 st stopper, 522-1 st horizontal surface, 523-1 st inclined surface, 530-1 st spring, 531-1 st fluid pressure cylinder, 540-2 nd rod, 541-2 nd fitting groove, 542-2 nd movement stop surface, 543-2 nd guide surface, 550-2 nd stopper, 552-2 nd horizontal surface, 553-2 nd inclined surface, 560-2 nd spring, 561-2 nd fluid pressure cylinder, 570-rod, 700-control device.

Detailed Description

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings, but the same or corresponding components are denoted by the same or corresponding reference numerals in the drawings, and the description thereof will be omitted.

(injection molding machine)

Fig. 1 is a diagram showing a state at the end of mold opening of an injection molding machine according to an embodiment. Fig. 2 is a diagram showing a state of the injection molding machine according to an embodiment when clamping a mold. In fig. 1 to 2, the X direction, the Y direction, and the Z direction are perpendicular to each other. The Z direction represents a vertical direction, and the X direction and the Y direction represent a horizontal direction. As shown in fig. 1 to 2, the injection molding machine includes a mold clamping device 100, an ejector device 200, an injection device 300, a moving device 400, and a control device 700. Hereinafter, each constituent element of the injection molding machine will be described.

(mold clamping device)

The mold clamping device 100 closes, clamps, and opens the mold of the mold device 10. The mold clamping device 100 is, for example, a vertical type, and the mold opening and closing direction is the vertical direction. The mold clamping apparatus 100 includes an upper platen 110, a lower platen 120, a toggle base 130, a connecting rod 140, a toggle mechanism 150, a mold clamping motor 160, a motion conversion mechanism 170, and a mold thickness adjustment mechanism 180.

The upper platen 110 is disposed above the lower platen 120 and is movable up and down with respect to the frame Fr. An upper die 11 is attached to a surface (lower surface) of the upper platen 110 facing the lower platen 120.

The lower pressure plate 120 is fixed to the frame Fr. A plurality of lower dies 12 are attached to a surface (upper surface) of the lower platen 120 facing the upper platen 110 via a turntable 121. The upper die 11 and the lower die 12 constitute a die apparatus 10.

The lower die 12 is moved between a position opposed to the upper die 11 and a position where the molded article is taken out by rotating the turntable 121 by 180 °. The position where the molded article is taken out may be used as a preparation position for setting an insert (insert) member in the lower mold 12.

Further, the lower mold 12 of the present embodiment is attached to the lower platen 120 via the turn table 121, but may be directly attached to the lower platen 120. The number of the lower dies 12 is not limited to 2, and may be 1 or 3 or more.

The toggle seat 130 is connected to the upper platen 110, and is vertically movable below the lower platen 120 with respect to the frame Fr. The upper platen 110 is raised and lowered by raising and lowering the toggle seat 130.

The tie bars 140 connect the upper platen 110 and the toggle seats 130 with a space L therebetween in the mold opening and closing direction. A plurality of (e.g., 3) connecting rods 140 may be used. Each tie bar 140 is parallel to the mold opening and closing direction and extends according to the mold clamping force. At least one of the tie bars 140 is provided with a tie bar deformation detector 141 that detects deformation of the tie bar 140. The connecting rod deformation detector 141 transmits a signal indicating the detection result to the control device 700. The detection result of the tie bar deformation detector 141 is used for detection of the mold clamping force and the like.

In the present embodiment, the tie bar deformation detector 141 is used as the mold clamping force detector for detecting the mold clamping force, but the present invention is not limited to this. The mold clamping force detector is not limited to the strain gauge type, and may be a piezoelectric type, a capacitive type, a hydraulic type, an electromagnetic type, or the like, and the attachment position thereof is not limited to the tie bar 140.

The toggle mechanism 150 is disposed between the lower platen 120 and the toggle base 130, and raises and lowers the toggle base 130 relative to the lower platen 120. The toggle mechanism 150 is constituted by a cross 151, a pair of links, and the like. Each link group includes a 1 st link 152 and a 2 nd link 153 telescopically coupled by a pin or the like. The 1 st link 152 is pivotally attached to the lower platen 120 by a pin or the like, and the 2 nd link 153 is pivotally attached to the toggle seat 130 by a pin or the like. The 2 nd link 153 is attached to the crosshead 151 via the 3 rd link 154. When the crosshead 151 is relatively moved up and down with respect to the toggle base 130, the 1 st link 152 and the 2 nd link 153 extend and contract, and the toggle base 130 is moved up and down with respect to the lower platen 120.

The structure of the toggle mechanism 150 is not limited to the structure shown in fig. 1 and 2. For example, in fig. 1 and 2, the number of the fulcrums of each link group is 5, but may be 4, and one end of the 3 rd link 154 may be coupled to a node between the 1 st link 152 and the 2 nd link 153.

The mold clamping motor 160 operates the toggle mechanism 150. The mold clamping motor 160 moves the crosshead 151 up and down relative to the toggle base 130, thereby extending and contracting the 1 st link 152 and the 2 nd link 153 and moving the upper platen 110 up and down. The mold clamping motor 160 is coupled to the motion conversion mechanism 170 via a belt, a pulley, and the like, but may be directly coupled to the motion conversion mechanism 170.

The motion conversion mechanism 170 converts the rotational motion of the mold clamping motor 160 into the linear motion of the crosshead 151. The motion conversion mechanism 170 includes a screw shaft 171 and a screw nut 172 screwed to the screw shaft 171. Balls or rollers may be interposed between the screw shaft 171 and the screw nut 172.

The mold clamping motor 160 is attached to the toggle base 130, the screw shaft 171 is rotatably supported by the toggle base 130, and the screw nut 172 is fixed to the crosshead 151. When the clamping motor 160 is driven to rotate the screw shaft 171, the screw nut 172 and the crosshead 151 are relatively raised and lowered with respect to the toggle base 130. Thereby, the 1 st link 152 and the 2 nd link 153 extend and contract, and the toggle seat 130 is lifted and lowered.

The mold clamping motor 160 of the present embodiment is attached to the toggle seat 130, but may be attached to the frame Fr. In this case, the upper end portion of the screw shaft 171 may be rotatably supported by the crosshead 151, the lower end portion of the screw shaft 171 may be spline-coupled to a rotating member rotatably held by the frame Fr, and the screw nut 172 may be fixed to the toggle base 130. When the clamping motor 160 is driven to rotate the rotating member, the screw shaft 171 moves up and down while rotating, and the crosshead 151 moves up and down relative to the toggle base 130. Thereby, the 1 st link 152 and the 2 nd link 153 extend and contract, and the toggle seat 130 is lifted and lowered.

The mold clamping device 100 performs a mold closing process, a mold clamping process, a mold opening process, and the like under the control of the control device 700.

In the mold closing step, the mold clamping motor 160 is driven to raise the crosshead 151 relative to the toggle seat 130 at a set speed to a mold closing end position, thereby lowering the upper platen 110 and bringing the upper mold 11 into contact with the lower mold 12. The position and speed of the crosshead 151 are detected using, for example, a mold clamping motor encoder 161 and the like. The clamp motor encoder 161 detects the rotation of the clamp motor 160, and transmits a signal indicating the detection result to the control device 700.

In the mold clamping process, the mold clamping motor 160 is further driven to raise the crosshead 151 relative to the toggle seat 130 from the mold closing end position to the mold clamping position, thereby generating a mold clamping force. During mold closing, a cavity space 14 is formed between the upper mold 11 and the lower mold 12, and the injection device 300 fills the cavity space 14 with a liquid molding material. The filled molding material is cured to obtain a molded article. The number of the cavity spaces 14 may be plural, and in this case, plural molded articles can be obtained at the same time.

In the mold opening process, the mold closing motor 160 is driven to lower the crosshead 151 at a set speed relative to the toggle seat 130 to the mold opening completion position, thereby raising the upper platen 110 and separating the upper mold 11 from the lower mold 12. Thereafter, the turntable 121 is rotated, and the ejector 200 ejects the molded product from the lower mold 12 located at the position where the molded product is taken out.

The setting conditions in the mold closing step and the mold clamping step are set comprehensively as a series of setting conditions. For example, the speed and position of the crosshead 151 (including the speed switching position, the mold closing end position, and the mold clamping position) in the mold closing step and the mold clamping step are set as a series of setting conditions. Instead of the speed and position of the crosshead 151, the speed and position of the upper platen 110 may be set. Instead of the position of the crosshead (for example, the mold clamping position) or the position of the upper platen 110, the mold clamping force may be set.

However, the toggle mechanism 150 amplifies the driving force of the mold clamping motor 160 and transmits it to the upper platen 110. Its magnification is also referred to as the toggle magnification. The toggle magnification is changed according to an angle θ formed by the 1 st link 152 and the 2 nd link 153 (hereinafter, also referred to as "link angle θ"). The link angle θ is obtained from the position of the crosshead 151. When the link angle θ is 180 °, the toggle magnification becomes maximum.

When the thickness of the mold apparatus 10 changes due to, for example, replacement of the mold apparatus 10 or a change in temperature of the mold apparatus 10, the mold thickness is adjusted so that a predetermined mold clamping force is obtained at the time of mold clamping. In the die thickness adjustment, for example, at the time when the upper die 11 contacts the die contacting the lower die 12, the interval L between the upper platen 110 and the toggle seat 130 is adjusted so that the link angle θ of the toggle mechanism 150 becomes a predetermined angle.

The mold clamping device 100 includes a mold thickness adjusting mechanism 180 for adjusting the mold thickness by adjusting the distance L between the upper platen 110 and the toggle seat 130. The die thickness adjusting mechanism 180 includes: a screw shaft 181 formed at a lower end of the connection rod 140; a screw nut 182 rotatably held by the toggle seat 130; and a die thickness adjusting motor 183 for rotating a screw nut 182 screwed to the screw shaft 181.

The screw shaft 181 and the screw nut 182 are provided for each link 140. The rotation of the die thickness adjusting motor 183 can be transmitted to the plurality of lead screw nuts 182 via the rotation transmitting portion 185. A plurality of lead screw nuts 182 can be rotated in synchronization. Further, by changing the transmission path of the rotation transmission portion 185, it is also possible to rotate the plurality of screw nuts 182, respectively.

The rotation transmission portion 185 is formed of, for example, a gear. In this case, a driven gear is formed on the outer periphery of each screw nut 182, a drive gear is attached to the output shaft of the die thickness adjusting motor 183, and an intermediate gear that meshes with the plurality of driven gears and the drive gear is rotatably held in the center portion of the toggle seat 130. In addition, the rotation transmitting portion 185 may be formed of a belt, a pulley, or the like instead of the gear.

The operation of the die thickness adjusting mechanism 180 is controlled by the control device 700. The controller 700 drives the die thickness adjustment motor 183 to rotate the screw nut 182, thereby adjusting the position of the toggle seat 130, which rotatably holds the screw nut 182, with respect to the upper platen 110 and adjusting the interval L between the upper platen 110 and the toggle seat 130.

In the present embodiment, the screw nut 182 is rotatably held with respect to the toggle base 130, and the connecting rod 140 formed with the screw shaft 181 is fixed to the fixed platen 110.

For example, the screw nut 182 may be rotatably held by the upper platen 110, and the connection rod 140 may be fixed to the toggle seat 130. In this case, the interval L can be adjusted by rotating the screw nut 182.

The screw nut 182 may be fixed to the toggle seat 130, and the link lever 140 may be rotatably held by the upper platen 110. In this case, the interval L can be adjusted by rotating the connecting rod 140.

The screw nut 182 may be fixed to the upper platen 110, and the connecting rod 140 may be rotatably held by the toggle seat 130. In this case, the interval L can be adjusted by rotating the connecting rod 140.

The spacing L is detected using a die thickness adjustment motor encoder 184. The mold thickness adjusting motor encoder 184 detects the rotation amount and the rotation direction of the mold thickness adjusting motor 183, and transmits a signal indicating the detection result to the control device 700. The detection results of the die thickness adjustment motor encoder 184 are used for monitoring and controlling the position and spacing L of the toggle seat 130.

The die thickness adjusting mechanism 180 adjusts the interval L by rotating one of a screw shaft 181 and a screw nut 182 that are screwed together. A plurality of die thickness adjusting mechanisms 180 may be used, or a plurality of die thickness adjusting motors 183 may be used.

The die thickness adjusting mechanism 180 of the present embodiment includes a screw shaft 181 formed on the tie bar 140 and a screw nut 182 screwed to the screw shaft 181 in order to adjust the distance L, but the present invention is not limited thereto.

For example, the die thickness adjusting mechanism 180 may have a connecting rod temperature adjuster that adjusts the temperature of the connecting rod 140. The link temperature adjuster is installed at each link 140 and cooperatively adjusts the temperature of the plurality of links 140. The higher the temperature of the connection rod 140, the longer the connection rod 140 becomes due to thermal expansion, and the larger the interval L becomes. The temperature of the plurality of connecting rods 140 can also be independently adjusted.

The connecting rod temperature adjuster includes, for example, a heater such as a heater, and adjusts the temperature of the connecting rod 140 by heating. The connecting rod temperature regulator may also include a cooler such as a water jacket, which regulates the temperature of the connecting rod 140 by cooling. The connecting rod temperature regulator may also include both a heater and a cooler.

In the present embodiment, the lower platen 120 is a fixed platen and the upper platen 110 is a movable platen, but the lower platen 120 may be a movable platen and the upper platen 110 may be a fixed platen. In this case, the toggle mechanism 150 raises and lowers the lower platen 120 relative to the toggle base 130.

The mold clamping device 100 of the present embodiment is a vertical type in which the mold opening and closing direction is the vertical direction, but may be a horizontal type in which the mold opening and closing direction is the horizontal direction. The horizontal mold clamping device includes a fixed platen, a movable platen, a toggle base, a connecting rod, a toggle mechanism, a mold clamping motor, and the like. The fixed pressing plate is provided with a fixed die, and the movable pressing plate is provided with a movable die. The fixed die and the movable die form a die device. The toggle seat is disposed on the opposite side of the fixed platen with respect to the movable platen, and is connected to the fixed platen via a connecting rod. The connecting rod connects the fixed pressing plate and the toggle seat at intervals in the mold opening and closing direction. One of the toggle seat and the fixed platen is fixed to the frame, and the other is movable forward and backward relative to the frame in the mold opening and closing direction. The toggle mechanism is disposed between the toggle seat and the movable platen, and moves the movable platen forward and backward. The mold clamping motor operates the toggle mechanism. When the mold clamping device is horizontal, the number of tie bars is usually 4. The number of the tie bars is not particularly limited.

(Ejection device)

The ejector 200 ejects the molded product from the mold apparatus 10. For example, the ejector 200 ejects the molded product from the lower mold 12 located at the position where the molded product is taken out. The ejector 200 includes an ejector motor 210, a motion conversion mechanism 220, an ejector rod 230, and the like.

The ejection motor 210 is mounted to the lower platen 120. The eject motor 210 is directly connected to the motion conversion mechanism 220, but may be connected to the motion conversion mechanism 220 via a belt, a pulley, or the like.

The motion converting mechanism 220 converts the rotational motion of the eject motor 210 into the linear motion of the eject lever 230. The motion conversion mechanism 220 includes a screw shaft and a screw nut screwed to the screw shaft. Balls or rollers may be interposed between the screw shaft and the screw nut.

The ejector rod 230 penetrates the lower platen 120 and the turn table 121, and contacts the movable member 15 disposed in the lower mold 12 so as to be movable up and down. When the turntable 121 rotates, the ejector rod 230 is retracted from the through-hole of the turntable 121.

The ejection device 200 performs the ejection process under the control of the control device 700.

In the ejection process, the ejection motor 210 is driven to raise the ejector rod 230 from the standby position to the ejection position at a set speed, and the movable member 15 is raised to eject the molded product. Thereafter, the ejector motor 210 is driven to lower the ejector rod 230 at a set speed, and the movable member 15 is lowered to the original standby position. The position and speed of the ejector rod 230 are detected using, for example, the ejector motor encoder 211. The ejection motor encoder 211 detects the rotation of the ejection motor 210, and transmits a signal indicating the detection result to the control device 700.

(injection device)

The injection device 300 includes a slide base 302 that moves up and down along a guide 301 provided to the frame Fr, and moves up and down with respect to the upper platen 110. The injection device 300 is in contact with the mold device 10, and fills the cavity space 14 in the mold device 10 with the molding material. The injection device 300 includes, for example, a cylinder 310, a nozzle 320, a screw 330, a metering motor 340, an injection motor 350, a pressure detector 360, and the like.

The cylinder 310 heats the molding material supplied from the supply port 311 to the inside. The supply port 311 is formed in the upper portion of the cylinder 310. A cooler 312 such as a water-cooled cylinder is provided on the outer periphery of the upper portion of the cylinder 310. A heater 313 such as a band heater and a temperature detector 314 are provided on the outer periphery of the cylinder 310 below the cooler 312.

The cylinder 310 is divided into a plurality of regions in the axial direction (vertical direction in fig. 1 and 2) of the cylinder 310. A heating source 313 and a temperature detector 314 are provided in each region. The control device 700 controls the heater 313 so that the temperature detected by the temperature detector 314 becomes a set temperature for each region.

The nozzle 320 is provided at the lower end of the cylinder 310 and is pressed against the mold apparatus 10. A heater 313 and a temperature detector 314 are provided on the outer periphery of the nozzle 320. The control device 700 controls the heater 313 so that the detected temperature of the nozzle 320 becomes the set temperature.

The screw 330 is rotatably and vertically disposed in the cylinder 310. When the screw 330 is rotated, the molding material is fed downward along the spiral groove of the screw 330. The molding material is gradually melted by heat from the cylinder 310 while being sent downward. As the liquid molding material is sent to the lower portion of the screw 330 and accumulated in the lower portion of the cylinder 310, the screw 330 is raised. Thereafter, when the screw 330 is lowered, the liquid molding material accumulated below the screw 330 is injected from the nozzle 320 and is filled in the mold apparatus 10.

A check ring 331 is vertically movably attached to a lower portion of the screw 330 as a check valve for preventing the molding material from flowing backward upward from below the screw 330 when the screw 330 is pushed downward.

When the screw 330 is lowered, the check ring 331 is pushed upward by the pressure of the molding material below the screw 330, and is raised relative to the screw 330 to a blocking position where the flow path of the molding material is blocked (see fig. 2). This prevents the molding material accumulated below the screw 330 from flowing back upward.

On the other hand, when the screw 330 is rotated, the check ring 331 is pushed downward by the pressure of the molding material fed downward along the spiral groove of the screw 330, and is relatively lowered with respect to the screw 330 to the opening position (see fig. 1) where the flow path of the molding material is opened. Thereby, the molding material is sent to the lower side of the screw 330.

The check ring 331 may be any one of a co-rotating type rotating with the screw 330 and a non-co-rotating type not rotating with the screw 330.

In addition, the injection device 300 may have a driving source that raises and lowers the check ring 331 between the open position and the closed position with respect to the screw 330.

The metering motor 340 rotates the screw 330. The driving source for rotating the screw 330 is not limited to the metering motor 340, and may be, for example, a hydraulic pump.

The injection motor 350 raises and lowers the screw 330. A motion conversion mechanism or the like that converts the rotational motion of the injection motor 350 into the linear motion of the screw 330 is provided between the injection motor 350 and the screw 330. The motion conversion mechanism includes, for example, a screw shaft and a screw nut screwed to the screw shaft. Balls, rollers, and the like may be provided between the screw shaft and the screw nut. The driving source for raising and lowering the screw 330 is not limited to the injection motor 350, and may be, for example, a hydraulic cylinder.

The pressure detector 360 detects the pressure transmitted between the injection motor 350 and the screw 330. The pressure detector 360 is provided in a pressure transmission path between the injection motor 350 and the screw 330, and detects a pressure applied to the pressure detector 360.

The pressure detector 360 transmits a signal indicating the detection result to the control device 700. The detection result of the pressure detector 360 is used to control and monitor the pressure that the screw 330 receives from the molding material, the back pressure against the screw 330, the pressure applied from the screw 330 to the molding material, and the like.

The injection device 300 performs a filling process, a pressure holding process, a metering process, and the like under the control of the control device 700.

In the filling step, the injection motor 350 is driven to lower the screw 330 at a predetermined speed, and the liquid molding material accumulated below the screw 330 is filled into the cavity space 14 in the mold apparatus 10. The position and speed of the screw 330 is detected, for example, using an injection motor encoder 351. The injection motor encoder 351 detects the rotation of the injection motor 350, and transmits a signal indicating the detection result to the control device 700. When the position of the screw 330 reaches the set position, the filling process is switched to the holding pressure process (so-called V/P switching). The position where the V/P switching is performed is also referred to as a V/P switching position. The set speed of the screw 330 can be changed according to the position, time, and the like of the screw 330.

In the filling step, after the position of the screw 330 reaches the set position, the screw 330 may be temporarily stopped at the set position, and then the V/P switching may be performed. Instead of stopping the screw 330, the screw 330 may be slightly lowered or slightly raised before the V/P switching.

In the pressure retaining step, the injection motor 350 is driven to push the screw 330 downward, so that the pressure of the molding material at the lower end portion of the screw 330 (hereinafter also referred to as "holding pressure") is held at a set pressure, and the molding material remaining in the cylinder 310 is pressed toward the mold apparatus 10. The shortage of the molding material due to cooling shrinkage in the mold device 10 can be compensated. The holding pressure is detected, for example, using a pressure detector 360. The pressure detector 360 transmits a signal indicating the detection result to the control device 700. The set value of the holding pressure may be changed according to the elapsed time from the start of the pressure holding step.

In the pressure retaining step, the molding material in the cavity space 14 in the mold apparatus 10 is gradually cooled, and the entrance of the cavity space 14 is closed by the solidified molding material at the end of the pressure retaining step. This state is called gate sealing and prevents backflow of the molding material from the cavity space 14. After the pressure holding step, the cooling step is started. In the cooling step, the molding material in the cavity space 14 is solidified. In order to shorten the molding cycle time, the metering step may be performed in the cooling step.

In the metering step, the metering motor 340 is driven to rotate the screw 330 at a predetermined rotation speed, and the molding material is fed downward along the spiral groove of the screw 330. With this, the molding material gradually melts. The screw 330 ascends as the molding material in a liquid state is sent to a lower portion of the screw 330 and accumulated in a lower portion of the cylinder 310. The rotational speed of the screw 330 is detected using, for example, a metering motor encoder 341. The metering motor encoder 341 detects the rotation of the metering motor 340, and transmits a signal indicating the detection result to the control device 700.

In the metering step, the injection motor 350 may be driven to apply a predetermined back pressure to the screw 330 in order to restrict the screw 330 from rapidly rising. The back pressure on the screw 330 is detected, for example, using a pressure detector 360. The pressure detector 360 transmits a signal indicating the detection result to the control device 700. When the screw 330 is raised to the metering completion position and a predetermined amount of the molding material is accumulated below the screw 330, the metering process is completed.

The injection device 300 of the present embodiment is of a coaxial screw type, but may be of a premolded type or the like. In the injection device of the preplasticizing method, the molding material melted in the plasticizing cylinder is supplied to the injection cylinder, and the molding material is injected from the injection cylinder into the mold device. The screw is rotatably or rotatably and vertically disposed in the plasticizing cylinder, and the plunger is vertically disposed in the injection cylinder.

Further, the injection device 300 of the present embodiment is a vertical type in which the axial direction of the cylinder 310 is the vertical direction, but may be a horizontal type in which the axial direction of the cylinder 310 is the horizontal direction. The mold clamping device combined with the horizontal injection device 300 may be horizontal or vertical. Similarly, the mold clamping device combined with the vertical injection device 300 may be vertical or horizontal.

(moving device)

The moving device 400 raises and lowers the injection device 300 with respect to the frame Fr. Then, the moving device 400 presses the nozzle 320 to the mold device 10 to generate a nozzle contact pressure. The moving device 400 includes an injection device moving motor 410, a motion converting mechanism 420 that converts the rotational motion of the injection device moving motor 410 into the linear motion (lifting motion) of the injection device 300, and the like. The motion conversion mechanism 420 includes a screw shaft 421 and a screw nut 422 screwed to the screw shaft 421. Balls or rollers may be interposed between the screw shaft 421 and the screw nut 422.

For example, the injection device movement motor 410 is attached to the slide base 302, the screw shaft 421 is rotatably supported by the slide base 302, and the screw nut 422 is fixed to the upper platen 110. When the injection device moving motor 410 is driven to rotate the screw shaft 421, the screw shaft 421 moves up and down and the injection device 300 moves up and down with respect to the upper platen 110.

The injection device movement motor 410 according to the present embodiment is attached to the slide base 302, but may be attached to the upper platen 110. In this case, the screw shaft 421 may be rotatably supported by the upper platen 110, and the screw nut 422 may be fixed to the slider 302. When the injection device moving motor 410 is driven to rotate the screw shaft 421, the screw nut 422 moves up and down and the injection device 300 moves up and down with respect to the upper platen 110.

(control device)

As shown in fig. 1 to 2, the control device 700 includes a CPU (Central Processing Unit)701, a storage medium 702 such as a memory, an input I/F703, and an output I/F704. The control device 700 performs various controls by causing the CPU701 to execute a program stored in the storage medium 702. Further, control device 700 receives a signal from the outside through input I/F703 and transmits a signal to the outside through output I/F704.

The control device 700 repeats the mold closing step, mold opening step, and the like, to repeatedly manufacture a molded product. During the mold closing step, the control device 700 performs a metering step, a filling step, a pressure maintaining step, and the like. A series of operations for obtaining a molded product, for example, operations from the start of a metering step to the start of the next metering step, are also referred to as "injection" or "molding cycle". Also, the time required for 1 injection is also referred to as "molding cycle time".

Control device 700 is connected to operation device 750 and display device 760. Operation device 750 receives an input operation by a user, and outputs a signal corresponding to the input operation to control device 700. Display device 760 displays an operation screen corresponding to an input operation in operation device 750, under the control of control device 700.

The operation screen is used for setting the injection molding machine. A plurality of operation screens are prepared, or switched to be displayed, or overlapped to be displayed. The user operates the operation device 750 while viewing the operation screen displayed on the display device 760 to perform setting (including input of set values) of the injection molding machine.

The operation device 750 and the display device 760 may be formed of, for example, a touch panel and integrated. Further, although the operation device 750 and the display device 760 of the present embodiment are integrated, they may be provided separately. Also, a plurality of operating devices 750 may be provided.

(mechanical stopper)

Fig. 3 is a view showing a descent stop state of the upper platen by the 1 st stopper out of the 1 st stopper and the 2 nd stopper according to embodiment 1. Fig. 4 is a view showing a descent stop state of the upper platen by the 2 nd stopper out of the 1 st stopper and the 2 nd stopper according to embodiment 1. The moving direction of the upper platen 110 is the mold opening and closing direction, i.e., the Z direction.

The injection molding machine comprises: a 1 st lever 510 having a plurality of 1 st fitting grooves 511 arranged in the vertical direction; and a 1 st stopper 520 inserted into one of the 1 st fitting grooves 511 and brought into contact with the 1 st movement stop surface 512 of the 1 st fitting groove 511, thereby stopping the descent of the upper platen 110. Since the 1 st fitting grooves 511 are arranged in plural in the mold opening/closing direction, the stop positions of the upper platen by the 1 st stoppers 520 are arranged in plural at intervals in the mold opening/closing direction.

The 1 st rod 510 ascends and descends together with the upper platen 110. The 1 st rod 510 extends downward from the upper platen 110 and penetrates the frame Fr. The 1 st stopper 520 is supported by the frame Fr so as not to be lifted. The 1 st stopper 520 is inserted into the 1 st fitting groove 511 by moving in the horizontal direction, and abuts against the 1 st movement stop surface 512 of the 1 st fitting groove 511.

The 1 st fitting groove 511 has a 1 st movement stop surface 512 perpendicular to the mold opening and closing direction at its upper end portion. The 1 st fitting groove 511 has a 1 st guide surface 513 at a lower end portion thereof, which is inclined in a direction (upward in fig. 3 and 4) closer to the 1 st movement stop surface 512 as it goes toward the insertion direction (left direction in fig. 3 and 4) of the 1 st stopper 520. The 1 st guide surface 513 guides the 1 st stopper 520 inserted into the 1 st fitting groove 511.

The 1 st stopper 520 is biased in a direction of being inserted into the 1 st fitting groove 511 (in the left direction in fig. 3 and 4) by the elastic restoring force of the 1 st spring 530. For inserting and removing the 1 st stopper 520 into and from the 1 st fitting groove 511, a 1 st fluid pressure cylinder 531 such as a pneumatic cylinder is used.

When the controller 700 operates the 1 st fluid pressure cylinder 531, the 1 st stopper 520 is pulled out from the 1 st fitting groove 511 against the elastic restoring force of the 1 st spring 530. On the other hand, at the time of emergency stop, the control device 700 cancels the operation of the 1 st fluid pressure cylinder 531, and the 1 st stopper 520 is inserted into the 1 st fitting groove 511 by the elastic restoring force of the 1 st spring 530.

In the present embodiment, the direction in which the 1 st spring 530 applies force to the 1 st stopper 520 is the direction in which the 1 st stopper 520 is inserted into the 1 st fitting groove 511, but the direction in which the 1 st stopper 520 is pulled out from the 1 st fitting groove 511 may be used. In this case, when the controller 700 operates the 1 st fluid pressure cylinder 531, the 1 st stopper 520 is inserted into the 1 st fitting groove 511 against the elastic restoring force of the 1 st spring 530. On the other hand, when the control device 700 cancels the operation of the 1 st fluid pressure cylinder 531, the 1 st stopper 520 is pulled out from the 1 st fitting groove 511 by the elastic restoring force of the 1 st spring 530.

The 1 st stopper 520 has a 1 st horizontal surface 522 perpendicular to the mold opening and closing direction and a 1 st inclined surface 523 inclined in a direction (upward in fig. 3 and 4) closer to the 1 st horizontal surface 522 as the 1 st stopper 520 is inserted (leftward in fig. 3 and 4).

The 1 st inclined surface 523 of the 1 st stopper 520 contacts the 1 st guide surface 513 of the 1 st fitting groove 511, and the 1 st stopper 520 is inserted into the 1 st fitting groove 511. Thereafter, the 1 st movement stop surface 512 of the 1 st fitting groove 511 abuts against the 1 st horizontal surface 522 of the 1 st stopper 520, and the upper platen 110 stops descending.

In the present embodiment, the 1 st rod 510 moves up and down together with the upper platen 110, and the 1 st stopper 520 is not moved up and down, but the arrangement of the 1 st rod 510 and the 1 st stopper 520 may be reversed. The 1 st bar 510 may be set to be not lifted and the 1 st stopper 520 may be lifted together with the upper platen 110. In this case, the 1 st rod 510 is fixed to the frame Fr, extends upward from the frame Fr, and penetrates the upper platen 110. A 1 st stopper 520 is provided on the upper platen 110. The 1 st stopper 520 is inserted into the 1 st fitting groove 511 by moving in the horizontal direction, and abuts against the 1 st movement stop surface 512 of the 1 st fitting groove 511.

The injection molding machine comprises: a 2 nd rod 540 in which a plurality of 2 nd fitting grooves 541 are arranged in the vertical direction; and a 2 nd stopper 550 inserted into one of the 2 nd fitting grooves 541, and brought into contact with a 2 nd movement stop surface 542 of the 2 nd fitting groove 541, thereby stopping the descent of the upper platen 110. Since the 2 nd fitting grooves 541 are arranged in plural in the mold opening/closing direction, the stop position of the upper platen by the 2 nd stopper 550 is arranged in plural at intervals in the mold opening/closing direction.

The 2 nd rod 540 is provided at an interval from the 1 st rod 510 in a direction (for example, Y direction) orthogonal to the mold opening and closing direction (for example, Z direction), and ascends and descends together with the upper platen 110. The 2 nd rod 540 extends downward from the upper platen 110 and penetrates the frame Fr. On the frame Fr, the 2 nd stopper 550 is supported so as not to be lifted. The 2 nd stopper 550 is inserted into the 2 nd fitting groove 541 by moving in the horizontal direction, and abuts against the 2 nd movement stop surface 542 of the 2 nd fitting groove 541.

The 2 nd fitting groove 541 has a 2 nd movement stop surface 542 perpendicular to the die opening and closing direction at its upper end portion. The 2 nd fitting groove 541 has, at a lower end portion thereof, a 2 nd guide surface 543 inclined in a direction (upward in fig. 3 and 4) closer to the 2 nd movement stop surface 542 as it goes toward the insertion direction (right direction in fig. 3 and 4) of the 2 nd stopper 550. The 2 nd guide surface 543 guides the 2 nd stopper 550 inserted into the 2 nd fitting groove 541.

The 2 nd stopper 550 is biased in a direction of being inserted into the 2 nd fitting groove 541 (rightward direction in fig. 3 and 4) by an elastic restoring force of the 2 nd spring 560. For inserting and removing the 2 nd stopper 550 into and from the 2 nd fitting groove 541, a 2 nd fluid pressure cylinder 561 such as a pneumatic cylinder is used.

When the controller 700 operates the 2 nd fluid pressure cylinder 561, the 2 nd stopper 550 is pulled out from the 2 nd fitting groove 541 against the elastic restoring force of the 2 nd spring 560. On the other hand, at the time of emergency stop, the control device 700 cancels the operation of the 2 nd fluid pressure cylinder 561, and the 2 nd stopper 550 is inserted into the 2 nd fitting groove 541 by the elastic restoring force of the 2 nd spring 560.

In the present embodiment, the direction in which the 2 nd spring 560 applies force to the 2 nd stopper 550 is the direction in which the 2 nd stopper 550 is inserted into the 2 nd fitting groove 541, but the direction in which the 2 nd stopper 550 is pulled out from the 2 nd fitting groove 541 may be used. In this case, when the controller 700 operates the 2 nd fluid pressure cylinder 561, the 2 nd stopper 550 is inserted into the 2 nd fitting groove 541 against the elastic restoring force of the 2 nd spring 560. On the other hand, when the control device 700 deactivates the 2 nd fluid pressure cylinder 561, the 2 nd stopper 550 is pulled out from the 2 nd fitting groove 541 by the elastic restoring force of the 2 nd spring 560.

The 2 nd stopper 550 has a 2 nd horizontal surface 552 perpendicular to the mold opening and closing direction and a 2 nd inclined surface 553 inclined in a direction (upward in fig. 3 and 4) closer to the 2 nd horizontal surface 552 toward the insertion direction (right direction in fig. 3 and 4) of the 2 nd stopper 550.

The 2 nd inclined surface 553 of the 2 nd stopper 550 contacts the 2 nd guide surface 543 of the 2 nd fitting groove 541 while the 2 nd stopper 550 is inserted into the 2 nd fitting groove 541. Thereafter, the 2 nd movement stop surface 542 of the 2 nd fitting groove 541 abuts the 2 nd horizontal surface 552 of the 2 nd stopper 550, and the upper platen 110 stops descending.

In the present embodiment, the 2 nd rod 540 moves up and down together with the upper platen 110, and the 2 nd stopper 550 is not moved up and down, but the arrangement of the 2 nd rod 540 and the 2 nd stopper 550 may be reversed. It is set that the 2 nd rod 540 cannot be lifted and lowered while the 2 nd stopper 550 is lifted and lowered together with the upper platen 110. In this case, the 2 nd rod 540 is fixed to the frame Fr, extends upward from the frame Fr, and penetrates the upper platen 110. A 2 nd stopper 550 is provided on the upper platen 110. The 2 nd stopper 550 is inserted into the 2 nd fitting groove 541 by moving in the horizontal direction, and abuts against the 2 nd movement stop surface 542 of the 2 nd fitting groove 541.

If the control device 700 receives an emergency stop signal, for example, both the 1 st stop 520 and the 2 nd stop 550 are moved in the insertion direction. The emergency stop signal is generated, for example, when it is detected that foreign matter such as a person or an object has entered between the upper platen 110 and the lower platen 120. The intrusion of foreign matter can be detected by a switch, an infrared sensor, or the like. This can stop the lowering of the upper platen 110 and the mold closing.

The 1 st rod 510 and the 2 nd rod 540 may have different sizes and different shapes, but may have the same size and the same shape in order to reduce manufacturing costs. In this case, the 1 st fitting groove 511 and the 2 nd fitting groove 541 have the same size and the same shape. The pitch P1 in the mold opening/closing direction of the 1 st fitting groove 511 is the same as the pitch P2 in the mold opening/closing direction of the 2 nd fitting groove 541. In fig. 3 and 4, the 1 st fitting groove 511 and the 2 nd fitting groove 541 are arranged at equal pitches in the mold opening and closing direction, but may be arranged at unequal pitches.

In the present embodiment, the 1 st lever 510 and the 2 nd lever 540 are provided with a shift of Δ P in the mold opening/closing direction, and the 1 st fitting groove 511 and the 2 nd fitting groove 541 are provided with a shift of Δ P in the mold opening/closing direction. More specifically, the 1 st movement stop surface 512 of the 1 st fitting groove 511 and the 2 nd movement stop surface 542 of the 2 nd fitting groove 541 are provided at a distance of Δ P in the mold opening and closing direction.

The magnitude Δ P of the amount of displacement in the mold opening/closing direction between the 1 st fitting groove 511 and the 2 nd fitting groove 541 is smaller than the pitch P1 of the 1 st fitting groove 511 and the pitch P2 of the 2 nd fitting groove 541 (Δ P < P1, P2), and is, for example, half of the pitches P1, P2.

Therefore, as shown in fig. 3, when the 1 st movement stop surface 512 of the 1 st fitting groove 511 abuts the 1 st stopper 520, the 2 nd movement stop surface 542 of the 2 nd fitting groove 541 and the 2 nd stopper 550 are separated in the mold opening and closing direction.

As shown in fig. 4, when the 2 nd movement stop surface 542 of the 2 nd fitting groove 541 abuts against the 2 nd stopper 550, the 1 st movement stop surface 512 of the 1 st fitting groove 511 and the 1 st stopper 520 are separated in the mold opening and closing direction.

As is apparent from fig. 3 and 4, the stop position of the upper platen 110 by the 2 nd stopper 550 exists between the stop positions of the upper platen 110 by the 1 st stopper 520. Also, the stop position of the upper platen 110 based on the 1 st stopper 520 exists among the plurality of stop positions of the upper platen 110 based on the 2 nd stopper 550.

Therefore, the stop position of the upper platen 110 can be finely set by the 1 st stopper 520 and the 2 nd stopper 550 while sufficiently securing the pitch P1 of the 1 st fitting groove 511 and the pitch P2 of the 2 nd fitting groove 541. As a result, the moving distance of the upper platen 110 from the insertion of the 1 st stopper 520 and the 2 nd stopper 550 to the mold closing stop of the upper platen 110 can be shortened. Further, since the pitch P1 of the 1 st fitting groove 511 can be sufficiently ensured, the width of the 1 st fitting groove 511 can be sufficiently ensured, and the 1 st stopper 520 can be inserted deep into the 1 st fitting groove 511 before the 1 st movement stop surface 512 of the 1 st fitting groove 511 comes into contact with the 1 st stopper 520, as shown in fig. 3. Further, since the pitch P2 of the 2 nd fitting groove 541 can be sufficiently ensured, the width of the 2 nd fitting groove 541 can be sufficiently ensured, and the 2 nd stopper 550 can be inserted into the depth of the 2 nd fitting groove 541 before the 2 nd movement stop surface 542 of the 2 nd fitting groove 541 comes into contact with the 2 nd stopper 550, as shown in fig. 4.

Further, since the impact for stopping the upper platen 110 is applied to either one of the 1 st stopper 520 and the 2 nd stopper 550, even if either one of the 1 st stopper 520 and the 2 nd stopper 550 is damaged by the impact, the impact can be absorbed by the damage. Therefore, thereafter, the upper platen 110 can be reliably stopped by the remaining one of the 1 st stopper 520 and the 2 nd stopper 550.

Further, since an impact for stopping the upper platen 110 is applied to either one of the 1 st lever 510 and the 2 nd lever 540, even if either one of the 1 st lever 510 and the 2 nd lever 540 is broken by the impact, the impact can be absorbed by the breakage. Therefore, thereafter, the upper platen 110 can be reliably stopped by the remaining one of the 1 st lever 510 and the 2 nd lever 540.

The injection molding machine may further include a 3 rd stopper which is inserted into one of a plurality of 3 rd fitting grooves arranged in the mold opening and closing direction and abuts against a 3 rd movement stop surface of the 3 rd fitting groove, thereby stopping the movement of the upper platen 110 in the mold closing direction. The 3 rd fitting groove may be formed in either one of the 1 st lever 510 and the 2 nd lever 540, or may be formed in a 3 rd lever different from the 1 st lever 510 and the 2 nd lever 540.

The magnitude of the amount of displacement in the mold opening/closing direction between the 3 rd and 2 nd fitting grooves 541 and the magnitude Δ P of the amount of displacement in the mold opening/closing direction between the 2 nd and 1 st fitting grooves 541 and 511 are smaller than the pitch P1 of the 1 st fitting groove 511 and the pitch P2 of the 2 nd fitting groove 541, and may be 1/3 of the pitches P1 and P2, for example. The number of stoppers and rods is not particularly limited.

Fig. 5 is a view showing a descent stop state of the upper platen by the 1 st stopper out of the 1 st stopper and the 2 nd stopper according to embodiment 2. Fig. 6 is a view showing a state where the upper platen is stopped from being lowered by the 2 nd stopper out of the 1 st stopper and the 2 nd stopper according to embodiment 2. The moving direction of the upper platen 110 is the mold opening and closing direction, i.e., the Z direction.

In the above embodiment 1, the 1 st lever 510 and the 2 nd lever 540 are provided to be shifted in the mold opening/closing direction, and the 1 st fitting groove 511 and the 2 nd fitting groove 541 are provided to be shifted in the mold opening/closing direction.

In contrast, in the present embodiment, the 1 st stopper 520 and the 2 nd stopper 550 are provided to be shifted in the mold opening and closing direction. Hereinafter, the difference will be mainly explained.

The 1 st rod 510 and the 2 nd rod 540 may have different sizes and different shapes, but may have the same size and the same shape in order to reduce manufacturing costs. In this case, the 1 st fitting groove 511 and the 2 nd fitting groove 541 have the same size and the same shape, and the pitch P1 in the mold opening and closing direction of the 1 st fitting groove 511 is the same as the pitch P2 in the mold opening and closing direction of the 2 nd fitting groove 541. In fig. 5 and 6, the 1 st fitting groove 511 and the 2 nd fitting groove 541 are arranged at equal pitches in the mold opening and closing direction, but may be arranged at unequal pitches.

In the present embodiment, instead of the 1 st fitting groove 511 and the 2 nd fitting groove 541 being provided with a shift in the mold opening/closing direction, the 1 st stopper 520 and the 2 nd stopper 550 are provided with a shift in the mold opening/closing direction by Δ P (Δ P < P1, P2). More specifically, the 1 st horizontal surface 522 of the 1 st stopper 520 abutting the 1 st movement stop surface 512 and the 2 nd horizontal surface 552 of the 2 nd stopper 550 abutting the 2 nd movement stop surface 542 are provided with a shift of Δ P in the mold opening and closing direction.

Therefore, as shown in fig. 5, when the 1 st movement stop surface 512 of the 1 st fitting groove 511 abuts against the 1 st stopper 520, the 2 nd movement stop surface 542 of the 2 nd fitting groove 541 and the 2 nd stopper 550 are separated in the mold opening and closing direction.

As shown in fig. 6, when the 2 nd movement stop surface 542 of the 2 nd fitting groove 541 abuts against the 2 nd stopper 550, the 1 st movement stop surface 512 of the 1 st fitting groove 511 and the 1 st stopper 520 are separated in the mold opening and closing direction.

As is apparent from fig. 5 and 6, the stop position of the upper platen 110 by the 2 nd stopper 550 exists between the stop positions of the upper platen 110 by the 1 st stopper 520. Also, the stop position of the upper platen 110 based on the 1 st stopper 520 exists among the plurality of stop positions of the upper platen 110 based on the 2 nd stopper 550.

Therefore, the stop position of the upper platen 110 can be finely set by the 1 st stopper 520 and the 2 nd stopper 550 while sufficiently securing the pitch P1 of the 1 st fitting groove 511 and the pitch P2 of the 2 nd fitting groove 541. As a result, the moving distance of the upper platen 110 from the insertion of the 1 st stopper 520 and the 2 nd stopper 550 to the mold closing stop of the upper platen 110 can be shortened. Further, since the pitch P1 of the 1 st fitting groove 511 can be sufficiently ensured, the width of the 1 st fitting groove 511 can be sufficiently ensured, and the 1 st stopper 520 can be inserted deep into the 1 st fitting groove 511 before the 1 st movement stop surface 512 of the 1 st fitting groove 511 comes into contact with the 1 st stopper 520, as shown in fig. 5. Further, since the pitch P2 of the 2 nd fitting groove 541 can be sufficiently ensured, the width of the 2 nd fitting groove 541 can be sufficiently ensured, and the 2 nd stopper 550 can be inserted into the depth of the 2 nd fitting groove 541 before the 2 nd movement stop surface 542 of the 2 nd fitting groove 541 comes into contact with the 2 nd stopper 550 as shown in fig. 6.

Further, since the impact for stopping the upper platen 110 is applied to either one of the 1 st stopper 520 and the 2 nd stopper 550, even if either one of the 1 st stopper 520 and the 2 nd stopper 550 is damaged by the impact, the impact can be absorbed by the damage. Therefore, thereafter, the upper platen 110 can be reliably stopped by the remaining one of the 1 st stopper 520 and the 2 nd stopper 550.

Further, since an impact for stopping the upper platen 110 is applied to either one of the 1 st lever 510 and the 2 nd lever 540, even if either one of the 1 st lever 510 and the 2 nd lever 540 is broken by the impact, the impact can be absorbed by the breakage. Therefore, thereafter, the upper platen 110 can be reliably stopped by the remaining one of the 1 st lever 510 and the 2 nd lever 540.

The injection molding machine may further include a 3 rd stopper which is inserted into one of a plurality of 3 rd fitting grooves arranged in the mold opening and closing direction and abuts against a 3 rd movement stop surface of the 3 rd fitting groove, thereby stopping the movement of the upper platen 110 in the mold closing direction.

The 3 rd fitting groove may be formed in either one of the 1 st lever 510 and the 2 nd lever 540, or may be formed in a 3 rd lever different from the 1 st lever 510 and the 2 nd lever 540.

The magnitude of the amount of displacement in the mold opening and closing direction between the 3 rd stopper and the 2 nd stopper 550 and the magnitude Δ P of the amount of displacement in the mold opening and closing direction between the 2 nd stopper 550 and the 1 st stopper 520 are smaller than the pitch P1 of the 1 st fitting groove 511 and the pitch P2 of the 2 nd fitting groove 541, and may be 1/3 of the pitches P1 and P2, for example. The number of stoppers and rods is not particularly limited.

Fig. 7 is a view showing a descent stop state of the upper platen by the 1 st stopper out of the 1 st stopper and the 2 nd stopper according to embodiment 3. Fig. 8 is a view showing a state where the upper platen is stopped from being lowered by the 2 nd stopper out of the 1 st stopper and the 2 nd stopper according to embodiment 3. The moving direction of the upper platen 110 is the mold opening and closing direction, i.e., the Z direction.

In the above-described embodiment 1 and the above-described embodiment 2, the 1 st lever 510 formed with the 1 st fitting groove 511 and the 2 nd lever 540 formed with the 2 nd fitting groove 541 are provided separately, and are provided with a space in a direction (for example, Y direction) orthogonal to the mold opening and closing direction (for example, Z direction). By disposing the 1 st fitting groove 511 and the 2 nd fitting groove 541 separately on different levers, a decrease in the strength of the levers can be suppressed.

In contrast, in the present embodiment, the 1 st fitting groove 511 and the 2 nd fitting groove 541 are provided on the same rod and are provided at intervals in the circumferential direction of the rod. By providing both the 1 st fitting groove 511 and the 2 nd fitting groove 541 in one rod, the number of rods can be reduced. Hereinafter, the difference will be mainly explained.

The injection molding machine has one rod 570 that forms both the 1 st fitting groove 511 and the 2 nd fitting groove 541. The rod 570 ascends and descends together with the upper platen 110. On the other hand, the 1 st stopper 520 inserted into the 1 st fitting groove 511 and the 2 nd stopper 550 inserted into the 2 nd fitting groove 541 are not lifted.

In the present embodiment, the rod 570 is raised and lowered together with the upper platen 110, and the 1 st stopper 520 and the 2 nd stopper 550 are set to be unable to be raised and lowered, but the rod 570 may be set to be unable to be raised and lowered, and the 1 st stopper 520 and the 2 nd stopper 550 may be able to be raised and lowered together with the upper platen 110. In this case, the rod 570 is fixed to the frame Fr, and extends upward from the frame Fr to penetrate the upper platen 110. The upper platen 110 is provided with a 1 st stopper 520 and a 2 nd stopper 550. The 1 st stopper 520 is inserted into the 1 st fitting groove 511 by moving in the horizontal direction, and abuts against the 1 st movement stop surface 512 of the 1 st fitting groove 511. The 2 nd stopper 550 is inserted into the 2 nd fitting groove 541 by moving in the horizontal direction, and abuts against the 2 nd movement stop surface 542 of the 2 nd fitting groove 541.

The 1 st and 2 nd fitting grooves 511, 541 are formed offset in the circumferential direction of the rod 570, for example, at 180 ° pitches around the rod 570. The 1 st fitting groove 511 and the 2 nd fitting groove 541 may have the same size and the same shape. The pitch P1 in the mold opening/closing direction of the 1 st fitting groove 511 and the pitch P2 in the mold opening/closing direction of the 2 nd fitting groove 541 may be the same. In fig. 7 and 8, the 1 st fitting groove 511 and the 2 nd fitting groove 541 are arranged at equal pitches in the mold opening and closing direction, but may be arranged at unequal pitches.

In the present embodiment, the 1 st fitting groove 511 and the 2 nd fitting groove 541 are provided with a shift of Δ P in the mold opening/closing direction (Δ P < P1, P2). More specifically, the 1 st movement stop surface 512 of the 1 st fitting groove 511 and the 2 nd movement stop surface 542 of the 2 nd fitting groove 541 are provided at a distance of Δ P in the mold opening and closing direction.

Therefore, as shown in fig. 7, when the 1 st movement stop surface 512 of the 1 st fitting groove 511 abuts against the 1 st stopper 520, the 2 nd movement stop surface 542 of the 2 nd fitting groove 541 and the 2 nd stopper 550 are separated in the mold opening and closing direction.

As shown in fig. 8, when the 2 nd movement stop surface 542 of the 2 nd fitting groove 541 abuts against the 2 nd stopper 550, the 1 st movement stop surface 512 of the 1 st fitting groove 511 and the 1 st stopper 520 are separated in the mold opening and closing direction.

As is apparent from fig. 7 and 8, the stop position of the upper platen 110 by the 2 nd stopper 550 exists between the stop positions of the upper platen 110 by the 1 st stopper 520. Also, the stop position of the upper platen 110 based on the 1 st stopper 520 exists among the plurality of stop positions of the upper platen 110 based on the 2 nd stopper 550.

Therefore, the stop position of the upper platen 110 can be finely set by the 1 st stopper 520 and the 2 nd stopper 550 while sufficiently securing the pitch P1 of the 1 st fitting groove 511 and the pitch P2 of the 2 nd fitting groove 541. As a result, the moving distance of the upper platen 110 from the insertion of the 1 st stopper 520 and the 2 nd stopper 550 to the mold closing stop of the upper platen 110 can be shortened. Further, since the pitch P1 of the 1 st fitting groove 511 can be sufficiently ensured, the width of the 1 st fitting groove 511 can be sufficiently ensured, and the 1 st stopper 520 can be inserted deep into the 1 st fitting groove 511 before the 1 st movement stop surface 512 of the 1 st fitting groove 511 comes into contact with the 1 st stopper 520, as shown in fig. 7. Further, since the pitch P2 of the 2 nd fitting groove 541 can be sufficiently ensured, the width of the 2 nd fitting groove 541 can be sufficiently ensured, and the 2 nd stopper 550 can be inserted into the depth of the 2 nd fitting groove 541 before the 2 nd movement stop surface 542 of the 2 nd fitting groove 541 comes into contact with the 2 nd stopper 550, as shown in fig. 8.

Further, since the impact for stopping the upper platen 110 is applied to either one of the 1 st stopper 520 and the 2 nd stopper 550, even if either one of the 1 st stopper 520 and the 2 nd stopper 550 is damaged by the impact, the impact can be absorbed by the damage. Therefore, thereafter, the upper platen 110 can be reliably stopped by the remaining one of the 1 st stopper 520 and the 2 nd stopper 550.

The injection molding machine may further include a 3 rd stopper which is inserted into one of a plurality of 3 rd fitting grooves arranged in the mold opening and closing direction and abuts against a 3 rd movement stop surface of the 3 rd fitting groove, thereby stopping the movement of the upper platen 110 in the mold opening and closing direction.

The 3 rd fitting groove may be formed in the rod 570 in which the 1 st fitting groove 511 and the 2 nd fitting groove 541 are formed, or may be formed in a 3 rd rod different from the rod 570. In the former case, the 3 rd, 2 nd, and 1 st fitting grooves 541, 511 are formed offset in the circumferential direction of the rod 570, and may be formed around the rod 570 at a pitch of 120 °, for example.

The magnitude of the amount of displacement in the mold opening/closing direction between the 3 rd and 2 nd fitting grooves 541 and the magnitude Δ P of the amount of displacement in the mold opening/closing direction between the 2 nd and 1 st fitting grooves 541 and 511 are smaller than the pitch P1 of the 1 st fitting groove 511 and the pitch P2 of the 2 nd fitting groove 541, and may be 1/3 of the pitches P1 and P2, for example. The number of stoppers and rods is not particularly limited.

Fig. 9 is a view showing a state where the upper platen is stopped by the 1 st stopper out of the 1 st stopper and the 2 nd stopper according to embodiment 4. Fig. 10 is a view showing a state where the upper platen is stopped from being lowered by the 2 nd stopper out of the 1 st stopper and the 2 nd stopper according to embodiment 4. The moving direction of the upper platen 110 is the mold opening and closing direction, i.e., the Z direction.

In the above-described embodiment 3, the 1 st fitting groove 511 and the 2 nd fitting groove 541 are provided in the single rod 570 so as to be shifted in the mold opening/closing direction, and the 1 st stopper 520 and the 2 nd stopper 550 are provided at the same position in the mold opening/closing direction. The 1 st stopper 520 and the 2 nd stopper 550 can be disposed on the same plane perpendicular to the mold opening and closing direction, and the 1 st stopper 520 and the 2 nd stopper 550 can be easily aligned.

In contrast, in the present embodiment, the 1 st fitting groove 511 and the 2 nd fitting groove 541 are provided at the same position in the mold opening and closing direction, and the 1 st stopper 520 and the 2 nd stopper 550 are provided so as to be shifted in the mold opening and closing direction. Since the 1 st fitting groove 511 and the 2 nd fitting groove 541 can be symmetrically arranged in one rod 570, the rod 570 can be easily manufactured. Hereinafter, the difference will be mainly explained.

The 1 st fitting groove 511 and the 2 nd fitting groove 541 have the same size and the same shape, and a pitch P1 in the mold opening and closing direction of the 1 st fitting groove 511 is the same as a pitch P2 in the mold opening and closing direction of the 2 nd fitting groove 541. In fig. 9 and 10, the 1 st fitting groove 511 and the 2 nd fitting groove 541 are arranged at equal pitches in the mold opening and closing direction, but may be arranged at unequal pitches.

In the present embodiment, instead of the 1 st fitting groove 511 and the 2 nd fitting groove 541 being provided with a shift in the mold opening/closing direction, the 1 st stopper 520 and the 2 nd stopper 550 are provided with a shift in the mold opening/closing direction by Δ P (Δ P < P1, P2). More specifically, the 1 st horizontal surface 522 of the 1 st stopper 520 abutting the 1 st movement stop surface 512 and the 2 nd horizontal surface 552 of the 2 nd stopper 550 abutting the 2 nd movement stop surface 542 are provided with a shift of Δ P in the mold opening and closing direction.

Therefore, as shown in fig. 9, when the 1 st movement stop surface 512 of the 1 st fitting groove 511 abuts against the 1 st stopper 520, the 2 nd movement stop surface 542 of the 2 nd fitting groove 541 and the 2 nd stopper 550 are separated in the mold opening and closing direction.

As shown in fig. 10, when the 2 nd movement stop surface 542 of the 2 nd fitting groove 541 abuts against the 2 nd stopper 550, the 1 st movement stop surface 512 of the 1 st fitting groove 511 and the 1 st stopper 520 are separated in the mold opening and closing direction.

As is apparent from fig. 9 and 10, the stop position of the upper platen 110 by the 2 nd stopper 550 exists between the stop positions of the upper platen 110 by the 1 st stopper 520. Also, the stop position of the upper platen 110 based on the 1 st stopper 520 exists among the plurality of stop positions of the upper platen 110 based on the 2 nd stopper 550.

Therefore, the stop position of the upper platen 110 can be finely set by the 1 st stopper 520 and the 2 nd stopper 550 while sufficiently securing the pitch P1 of the 1 st fitting groove 511 and the pitch P2 of the 2 nd fitting groove 541. As a result, the moving distance of the upper platen 110 from the insertion of the 1 st stopper 520 and the 2 nd stopper 550 to the mold closing stop of the upper platen 110 can be shortened. Further, since the pitch P1 of the 1 st fitting groove 511 can be sufficiently ensured, the width of the 1 st fitting groove 511 can be sufficiently ensured, and the 1 st stopper 520 can be inserted deep into the 1 st fitting groove 511 before the 1 st movement stop surface 512 of the 1 st fitting groove 511 comes into contact with the 1 st stopper 520, as shown in fig. 9. Further, since the pitch P2 of the 2 nd fitting groove 541 can be sufficiently ensured, the width of the 2 nd fitting groove 541 can be sufficiently ensured, and the 2 nd stopper 550 can be inserted into the depth of the 2 nd fitting groove 541 before the 2 nd movement stop surface 542 of the 2 nd fitting groove 541 comes into contact with the 2 nd stopper 550, as shown in fig. 10.

Further, since the impact for stopping the upper platen 110 is applied to either one of the 1 st stopper 520 and the 2 nd stopper 550, even if either one of the 1 st stopper 520 and the 2 nd stopper 550 is damaged by the impact, the impact can be absorbed by the damage. Therefore, thereafter, the upper platen 110 can be reliably stopped by the remaining one of the 1 st stopper 520 and the 2 nd stopper 550.

However, in the present embodiment, the 1 st fitting groove 511 and the 2 nd fitting groove 541 are formed in the same rod 570 and at the same position in the mold opening and closing direction. Therefore, the 1 st fitting groove 511 and the 2 nd fitting groove 541 may be connected in the circumferential direction of the rod 570 to form an annular groove, but may be disconnected in the circumferential direction of the rod 570 from the viewpoint of strength of the rod 570.

The injection molding machine may further include a 3 rd stopper which stops the movement of the upper platen 110 in the mold opening and closing direction by being inserted into one of a plurality of 3 rd fitting grooves arranged in the mold opening and closing direction and abutting a 3 rd movement stop surface of the 3 rd fitting groove.

The 3 rd fitting groove may be formed in the rod 570 in which the 1 st fitting groove 511 and the 2 nd fitting groove 541 are formed, or may be formed in a 3 rd rod different from the rod 570. In the former case, the 3 rd, 2 nd, and 1 st fitting grooves 541, 511 are formed offset in the circumferential direction of the rod 570, and may be formed around the rod 570 at a pitch of 120 °, for example.

The magnitude of the amount of displacement in the mold opening and closing direction between the 3 rd stopper and the 2 nd stopper 550 and the magnitude Δ P of the amount of displacement in the mold opening and closing direction between the 2 nd stopper 550 and the 1 st stopper 520 are smaller than the pitch P1 of the 1 st fitting groove 511 and the pitch P2 of the 2 nd fitting groove 541, and may be 1/3 of the pitches P1 and P2, for example. The number of stoppers and rods is not particularly limited.

(modification and improvement)

The embodiment of the injection molding machine and the like have been described above, but the present invention is not limited to the above embodiment and the like, and various modifications and improvements can be made within the spirit of the present invention described in the claims.

For example, in embodiment 1, embodiment 2, embodiment 3, and embodiment 4, the upper platen 110 corresponds to the movable member described in the claims, but the type of the movable member is not particularly limited. For example, when the upper platen 110 is a fixed platen and the lower platen 120 is a movable platen, the lower platen 120 corresponds to the movable member described in the claims. In this case, the 1 st stopper 520 and the 2 nd stopper stop the mold closing of the lower pressing plate 120. The 1 st stopper 520 and the 2 nd stopper 550 stop mold closing of the vertical mold clamping device 100, but mold opening of the vertical mold clamping device 100 may also be stopped. The 1 st stopper 520 and the 2 nd stopper 550 may stop mold closing of the horizontal mold clamping device 100 or stop mold opening of the horizontal mold clamping device 100. Hereinafter, a case where the mold apparatus 100 is horizontal will be described.

When the mold clamping device 100 is of the horizontal type, the 1 st and 2 nd bars 510 and 540 shown in fig. 3 to 6 are set to move in the mold opening and closing direction together with the movable platen, and the 1 st and 2 nd stoppers 520 and 550 are set to be immovable in the mold opening and closing direction. The 1 st lever 510 and the 2 nd lever 540 are fixed to the movable platen at one end and extend from the movable platen toward the toggle seat in the mold opening and closing direction. On the other hand, the 1 st stopper 520 and the 2 nd stopper 550 are held by the toggle seat.

In addition, the arrangement of the 1 st lever 510 and the 1 st stopper 520 may be reversed, and the 1 st stopper 520 may be provided to move in the mold opening and closing direction together with the movable platen, and the 1 st lever 510 may be provided not to move in the mold opening and closing direction. Likewise, the 2 nd rod 540 and the 2 nd stopper 550 may be arranged in opposite directions, and the 2 nd stopper 550 may be arranged to move in the mold opening and closing direction together with the movable platen, and the 2 nd rod 540 may be arranged not to move in the mold opening and closing direction.

When the mold clamping device 100 is horizontal, the rod 570 shown in fig. 7 to 10 is provided so as to move in the mold opening and closing direction together with the movable platen, and the 1 st stopper 520 and the 2 nd stopper 550 are provided so as not to move in the mold opening and closing direction. The rod 570 is fixed to the movable platen at one end and extends from the movable platen toward the toggle seat in the mold opening and closing direction. On the other hand, the 1 st stopper 520 and the 2 nd stopper 550 are held by the toggle seat.

The 1 st stopper 520 and the 2 nd stopper 550 may be arranged opposite to the rod 570, and the 1 st stopper 520 and the 2 nd stopper 550 may be arranged to move in the mold opening and closing direction together with the movable platen, and the rod 570 may be arranged to be immovable in the mold opening and closing direction. In this case, the rod 570 is fixed at one end to the toggle base and extends from the toggle base toward the movable platen in the mold opening and closing direction. On the other hand, the 1 st stopper 520 and the 2 nd stopper 550 are held by the movable platen.

Claims (5)

1. An injection molding machine, comprising:

a 1 st stopper inserted into one of a plurality of 1 st fitting grooves arranged in a moving direction of a movable member, and abutting against a 1 st movement stop surface of the 1 st fitting groove, thereby stopping the movement of the movable member; and

a 2 nd stopper inserted into one of a plurality of 2 nd fitting grooves arranged in the moving direction of the movable member and brought into contact with a 2 nd movement stop surface of the 2 nd fitting groove to stop the movement of the movable member,

a plurality of stop positions of the movable member based on the 1 st stopper are arranged at intervals in the moving direction of the movable member,

a plurality of stop positions of the movable member based on the 2 nd stopper are arranged at intervals in the moving direction of the movable member,

there is a stop position of the movable member based on the 2 nd stopper between a plurality of stop positions of the movable member based on the 1 st stopper.

2. The injection molding machine according to claim 1,

the first rod and the second rod are independently provided with a 1 st rod with the 1 st embedding groove and a 2 nd rod with the 2 nd embedding groove.

3. The injection molding machine according to claim 1,

the first and second lever portions have a single lever in which both the 1 st and 2 nd fitting grooves are formed.

4. The injection molding machine according to any one of claims 1 to 3,

the 1 st movement stop surface of the 1 st fitting groove and the 2 nd movement stop surface of the 2 nd fitting groove are displaced in the moving direction of the movable member.

5. The injection molding machine according to any one of claims 1 to 3,

a surface of the 1 st stopper abutting the 1 st movement stop surface and a surface of the 2 nd stopper abutting the 2 nd movement stop surface are displaced in the moving direction of the movable member.

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