JP2021091232A - Injection molding machine - Google Patents

Abstract

To provide an injection molding machine capable of improving assembling accuracy between members constituting the injection molding machine.SOLUTION: An injection molding machine includes a motor, a screw shaft rotated by the motor, a movement conversion mechanism including a nut screwed into the screw shaft and moved forward and backward by rotation of the screw shaft, and a base into which the motor and the movement conversion mechanism are assembled. The base and members assembled into the base are spigot-fitted.SELECTED DRAWING: Figure 6

Description

The present invention relates to an injection molding machine.

In the injection molding machine described in Patent Document 1, both shafts are provided by providing a spline on the motor shaft side that meshes with a spline on the screw shaft side for injection drive on an inner peripheral surface of a bearing cylinder separate from the motor shaft. Allows connection by splines. An electric motor for injection drive and a rotatable ball screw shaft whose rear end is connected to the motor shaft and projected inward are provided on the rear plate. Both the rear plate and the front plate have four corners connected to the tie bar.

Japanese Unexamined Patent Publication No. 2002-355867

In the conventional assembly, centering and positioning in the front-rear direction are not sufficient, and the assembly accuracy is poor. For example, the electric motor and the rear plate are not centered, and an eccentric load may be applied to the spline.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an injection molding machine capable of improving assembling accuracy between members constituting the injection molding machine.

In order to solve the above problems, according to one aspect of the present invention,
With the motor
A motion conversion mechanism including a screw shaft rotated by the motor and a screw nut screwed onto the screw shaft and moved forward and backward by the rotation of the screw shaft.
With a base to which the motor and the motion conversion mechanism are assembled
An injection molding machine is provided in which the base and a member assembled to the base are in-row fitted.

According to one aspect of the present invention, there is provided an injection molding machine capable of improving the assembling accuracy of the members constituting the injection molding machine.

It is a figure which shows the state at the time of completion of the mold opening of the injection molding machine by one Embodiment. It is a figure which shows the state at the time of mold clamping of the injection molding machine by one Embodiment. It is a top view which shows an example of the structure of the injection apparatus by one Embodiment. It is sectional drawing of the injection apparatus along line IV-IV of FIG. It is sectional drawing of the injection apparatus along the VV line of FIG. It is a figure which shows the assembly procedure of each member with respect to the rear support by one Embodiment. Following FIG. 6, it is a figure which shows the assembling procedure of each member with respect to a rear support. It is sectional drawing which shows 1st example to 6th example of the inlay fitting of the 1st member and 2nd member. It is sectional drawing which shows the assembly completion state of each member with respect to the rear support by a modification.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings, but in each drawing, the same or corresponding configurations will be referred to with the same or corresponding reference numerals, and the description thereof will be omitted.

(Injection molding machine)
FIG. 1 is a diagram showing a state at the time of completion of mold opening of the injection molding machine according to one embodiment. FIG. 2 is a diagram showing a state at the time of mold clamping of the injection molding machine according to one embodiment. As shown in FIGS. 1 and 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 component of the injection molding machine will be described.

(Molding device)
In the description of the mold clamping device 100, the moving direction of the movable platen 120 when the mold is closed (right direction in FIGS. 1 and 2) is forward, and the moving direction of the movable platen 120 when the mold is opened (left in FIGS. 1 and 2). Direction) will be described as backward.

The mold clamping device 100 closes, molds, and opens the mold of the mold apparatus 10. The mold clamping device 100 is, for example, a horizontal type, and the mold opening / closing direction is the horizontal direction. The mold clamping device 100 includes a fixed platen 110, a movable platen 120, a toggle support 130, a tie bar 140, a toggle mechanism 150, a mold clamping motor 160, a motion conversion mechanism 170, and a mold thickness adjusting mechanism 180.

The fixed platen 110 is fixed to the frame Fr. The fixed mold 11 is attached to the surface of the fixed platen 110 facing the movable platen 120.

The movable platen 120 is movable in the mold opening / closing direction with respect to the frame Fr. A guide 101 for guiding the movable platen 120 is laid on the frame Fr. The movable mold 12 is attached to the surface of the movable platen 120 facing the fixed platen 110.

By advancing and retreating the movable platen 120 with respect to the fixed platen 110, mold closing, mold clamping, and mold opening are performed. The mold device 10 is composed of the fixed mold 11 and the movable mold 12.

The toggle support 130 is connected to the fixed platen 110 at intervals, and is movably placed on the frame Fr in the mold opening / closing direction. The toggle support 130 may be movable along a guide laid on the frame Fr. The guide of the toggle support 130 may be the same as that of the guide 101 of the movable platen 120.

In the present embodiment, the fixed platen 110 is fixed to the frame Fr and the toggle support 130 is movable in the mold opening / closing direction with respect to the frame Fr, but the toggle support 130 is fixed to the frame Fr and the fixed platen. The 110 may be movable in the mold opening / closing direction with respect to the frame Fr.

The tie bar 140 connects the fixed platen 110 and the toggle support 130 at intervals L in the mold opening / closing direction. A plurality of tie bars 140 may be used. Each tie bar 140 is parallel to the mold opening / closing direction and extends according to the mold clamping force. At least one tie bar 140 is provided with a tie bar distortion detector 141 that detects the distortion of the tie bar 140. The tie bar strain detector 141 sends a signal indicating the detection result to the control device 700. The detection result of the tie bar strain detector 141 is used for detecting the mold clamping force and the like.

In the present embodiment, the tie bar strain 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 mounting position thereof is not limited to the tie bar 140.

The toggle mechanism 150 is arranged between the movable platen 120 and the toggle support 130, and moves the movable platen 120 with respect to the toggle support 130 in the mold opening / closing direction. The toggle mechanism 150 is composed of a crosshead 151, a pair of links, and the like. Each link group has a first link 152 and a second link 153 that are flexibly connected by a pin or the like. The first link 152 is swingably attached to the movable platen 120 with a pin or the like, and the second link 153 is swingably attached to the toggle support 130 with a pin or the like. The second link 153 is attached to the crosshead 151 via the third link 154. When the crosshead 151 is moved back and forth with respect to the toggle support 130, the first link 152 and the second link 153 bend and stretch, and the movable platen 120 moves back and forth with respect to the toggle support 130.

The configuration of the toggle mechanism 150 is not limited to the configurations shown in FIGS. 1 and 2. For example, in FIGS. 1 and 2, the number of nodes in each link group is 5, but it may be 4, and one end of the third link 154 is connected to the nodes of the first link 152 and the second link 153. May be done.

The mold clamping motor 160 is attached to the toggle support 130 and operates the toggle mechanism 150. The mold clamping motor 160 bends and stretches the first link 152 and the second link 153 by advancing and retreating the crosshead 151 with respect to the toggle support 130, and advances and retreats the movable platen 120 with respect to the toggle support 130. The mold clamping motor 160 is directly connected to the motion conversion mechanism 170, but may be connected to the motion conversion mechanism 170 via a belt, a pulley, or the like.

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

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

In the mold closing step, the mold clamping motor 160 is driven to advance the crosshead 151 to the mold closing completion position at a set speed, thereby advancing the movable platen 120 and touching the movable mold 12 with the fixed mold 11. The position and speed of the crosshead 151 are detected by using, for example, the encoder 161 of the mold clamping motor 160. The encoder 161 detects the rotation of the mold clamping motor 160 and sends a signal indicating the detection result to the control device 700.

In the mold clamping step, the mold clamping force 160 is further driven to further advance the crosshead 151 from the mold closing completion position to the mold clamping position to generate a mold clamping force. At the time of mold clamping, a cavity space 14 is formed between the movable mold 12 and the fixed mold 11, and the injection device 300 fills the cavity space 14 with a liquid molding material. A molded product is obtained by solidifying the filled molding material. The number of cavity spaces 14 may be plural, in which case a plurality of molded articles can be obtained at the same time.

In the mold opening step, the movable platen 120 is retracted and the movable mold 12 is separated from the fixed mold 11 by driving the mold clamping motor 160 to retract the crosshead 151 to the mold opening completion position at a set speed. After that, the ejector device 200 projects the molded product from the movable mold 12.

The setting conditions in the mold closing step and the mold clamping step are collectively set as a series of setting conditions. For example, the speed and position (including the speed switching position, the mold closing completion position, and the mold clamping position) of the crosshead 151 in the mold closing step and the mold clamping step are collectively set as a series of setting conditions. Instead of the speed and position of the crosshead 151, the speed and position of the movable platen 120 may be set.

By the way, the toggle mechanism 150 amplifies the driving force of the mold clamping motor 160 and transmits it to the movable platen 120. The amplification factor is also called the toggle magnification. The toggle magnification changes according to the angle θ (hereinafter, also referred to as “link angle θ”) formed by the first link 152 and the second link 153. The link angle θ is obtained from the position of the crosshead 151. When the link angle θ is 180 °, the toggle magnification is maximized.

When the thickness of the mold device 10 changes due to replacement of the mold device 10 or a temperature change of the mold device 10, the mold thickness is adjusted so that a predetermined mold clamping force can be obtained at the time of mold clamping. In the mold thickness adjustment, for example, the distance L between the fixed platen 110 and the toggle support 130 is set so that the link angle θ of the toggle mechanism 150 becomes a predetermined angle at the time of the mold touch when the movable mold 12 touches the fixed mold 11. To adjust.

The mold clamping device 100 has a mold thickness adjusting mechanism 180 that adjusts the mold thickness by adjusting the distance L between the fixed platen 110 and the toggle support 130. The mold thickness adjusting mechanism 180 rotates the screw shaft 181 formed at the rear end of the tie bar 140, the screw nut 182 rotatably held by the toggle support 130, and the screw nut 182 screwed to the screw shaft 181. It has a mold thickness adjusting motor 183.

The screw shaft 181 and the screw nut 182 are provided for each tie bar 140. The rotation of the mold thickness adjusting motor 183 may be transmitted to a plurality of screw nuts 182 via a rotation transmission unit 185 composed of a belt, a pulley, or the like. A plurality of screw nuts 182 can be rotated in synchronization. By changing the transmission path of the rotation transmission unit 185, it is possible to rotate the plurality of screw nuts 182 individually.

The rotation transmission unit 185 may be composed of gears or the like instead of the belt or pulley. In this case, a passive gear is formed on the outer circumference of each screw nut 182, a drive gear is attached to the output shaft of the mold thickness adjusting motor 183, and a plurality of passive gears and an intermediate gear that meshes with the drive gear are located at the center of the toggle support 130. It is held rotatably.

The operation of the mold thickness adjusting mechanism 180 is controlled by the control device 700. The control device 700 drives the mold thickness adjusting motor 183 to rotate the screw nut 182, thereby adjusting the position of the toggle support 130 that holds the screw nut 182 rotatably with respect to the fixed platen 110, and the fixed platen 110. Adjust the distance L from the toggle support 130.

In the present embodiment, the screw nut 182 is rotatably held with respect to the toggle support 130, and the tie bar 140 on which the screw shaft 181 is formed is fixed to the fixed platen 110, but the present invention is not limited thereto.

For example, the screw nut 182 may be rotatably held relative to the fixed platen 110 and the tie bar 140 may be fixed to the toggle support 130. In this case, the interval L can be adjusted by rotating the screw nut 182.

Further, the screw nut 182 may be fixed to the toggle support 130, and the tie bar 140 may be rotatably held to the fixed platen 110. In this case, the interval L can be adjusted by rotating the tie bar 140.

Furthermore, the screw nut 182 may be fixed to the fixed platen 110 and the tie bar 140 may be rotatably held relative to the toggle support 130. In this case, the interval L can be adjusted by rotating the tie bar 140.

The interval L is detected by using the encoder 184 of the mold thickness adjusting motor 183. The encoder 184 detects the amount of rotation and the direction of rotation of the mold thickness adjusting motor 183, and sends a signal indicating the detection result to the control device 700. The detection result of the encoder 184 is used for monitoring and controlling the position and interval L of the toggle support 130.

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

The mold thickness adjusting mechanism 180 of the present embodiment has a screw shaft 181 formed on the tie bar 140 and a screw nut 182 screwed onto the screw shaft 181 in order to adjust the interval L. Not limited to.

For example, the mold thickness adjusting mechanism 180 may have a tie bar temperature controller that adjusts the temperature of the tie bar 140. The tie bar temperature controller is attached to each tie bar 140 and adjusts the temperature of a plurality of tie bars 140 in cooperation with each other. The higher the temperature of the tie bar 140, the larger the interval L. The temperatures of the plurality of tie bars 140 can be adjusted independently.

The tie bar temperature controller includes a heater such as a heater, and regulates the temperature of the tie bar 140 by heating. The tie bar temperature controller includes a cooler such as a water-cooled jacket, and the temperature of the tie bar 140 may be adjusted by cooling. The tie bar temperature controller may include both a heater and a cooler.

The mold clamping device 100 of the present embodiment is a horizontal type in which the mold opening / closing direction is horizontal, but may be a vertical type in which the mold opening / closing direction is in the vertical direction. The vertical mold clamping device includes a lower platen, an upper platen, a toggle support, a tie bar, a toggle mechanism, a mold clamping motor, and the like. One of the lower platen and the upper platen is used as a fixed platen, and the other one is used as a movable platen. A lower mold is attached to the lower platen, and an upper mold is attached to the upper platen. A mold device is composed of a lower mold and an upper mold. The lower mold may be attached to the lower platen via a rotary table. The toggle support is located below the lower platen. The toggle mechanism is disposed between the toggle support and the lower platen to raise and lower the movable platen. The mold clamping motor activates the toggle mechanism. The tie bar extends in the vertical direction, penetrates the lower platen, and connects the upper platen and the toggle support. When the mold clamping device is vertical, the number of tie bars is usually three. The number of tie bars is not particularly limited.

The mold clamping device 100 of the present embodiment has a mold clamping motor 160 as a drive source, but may have a hydraulic cylinder instead of the mold clamping motor 160. Further, the mold clamping device 100 may have a linear motor for opening and closing the mold and an electromagnet for mold clamping.

(Ejector device)
In the description of the ejector device 200, as in the description of the mold clamping device 100, the moving direction of the movable platen 120 when the mold is closed (right direction in FIGS. 1 and 2) is set to the front, and the movement of the movable platen 120 when the mold is opened. The direction (left direction in FIGS. 1 and 2) will be described as the rear direction.

The ejector device 200 projects a molded product from the mold device 10. The ejector device 200 includes an ejector motor 210, a motion conversion mechanism 220, an ejector rod 230, and the like.

The ejector motor 210 is attached to the movable platen 120. The ejector 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 conversion mechanism 220 converts the rotational motion of the ejector motor 210 into a linear motion of the ejector rod 230. The motion conversion mechanism 220 includes a screw shaft and a screw nut screwed onto the screw shaft. A ball or roller may be interposed between the screw shaft and the screw nut.

The ejector rod 230 is free to advance and retreat in the through hole of the movable platen 120. The front end portion of the ejector rod 230 comes into contact with the movable member 15 which is movably arranged inside the movable mold 12. The front end portion of the ejector rod 230 may or may not be connected to the movable member 15.

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

In the ejection step, the ejector motor 210 is driven to advance the ejector rod 230 at a set speed, whereby the movable member 15 is advanced and the molded product is ejected. After that, the ejector motor 210 is driven to retract the ejector rod 230 at a set speed, and the movable member 15 is retracted to the original position. The position and speed of the ejector rod 230 are detected by using, for example, the encoder 211 of the ejector motor 210. The encoder 211 detects the rotation of the ejector motor 210 and sends a signal indicating the detection result to the control device 700.

(Injection device)
In the description of the injection device 300, unlike the description of the mold clamping device 100 and the description of the ejector device 200, the moving direction of the screw 330 during filling (left direction in FIGS. 1 and 2) is set to the front, and the screw 330 during weighing is set forward. The moving direction of (the right direction in FIGS. 1 and 2) will be described as the rear.

The injection device 300 is installed on a slide base 301 that can move forward and backward with respect to the frame Fr, and is adjustable with respect to the mold device 10. The injection device 300 is touched by the mold device 10 to fill the cavity space 14 in the mold device 10 with a molding material. The injection device 300 includes, for example, a cylinder 310, a nozzle 320, a screw 330, a weighing motor 340, an injection motor 350, a pressure detector 360, and the like.

The cylinder 310 heats the molding material supplied internally from the supply port 311. The supply port 311 is formed at the rear of the cylinder 310. A cooler 312 such as a water-cooled cylinder is provided on the outer periphery of the rear 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 in front of the cooler 312.

The cylinder 310 is divided into a plurality of zones in the axial direction of the cylinder 310 (left-right direction in FIGS. 1 and 2). A heater 313 and a temperature detector 314 are provided in each zone. For each zone, the control device 700 controls the heater 313 so that the detection temperature of the temperature detector 314 becomes the set temperature.

The nozzle 320 is provided at the front end of the cylinder 310 and is pressed against the mold device 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 reaches the set temperature.

The screw 330 is arranged in the cylinder 310 so as to be rotatable and retractable. When the screw 330 is rotated, the molding material is fed forward along the spiral groove of the screw 330. The molding material is gradually melted by the heat from the cylinder 310 while being fed forward. As the liquid molding material is fed forward of the screw 330 and accumulated in the front of the cylinder 310, the screw 330 is retracted. After that, when the screw 330 is advanced, the liquid molding material accumulated in front of the screw 330 is ejected from the nozzle 320 and filled in the mold apparatus 10.

A backflow prevention ring 331 is freely attached to the front portion of the screw 330 as a backflow prevention valve for preventing backflow of the molding material from the front to the rear of the screw 330 when the screw 330 is pushed forward.

When the screw 330 is advanced, the backflow prevention ring 331 is pushed backward by the pressure of the molding material in front of the screw 330 and retracts to a closed position (see FIG. 2) that blocks the flow path of the molding material. As a result, the molding material accumulated in the front of the screw 330 is prevented from flowing backward.

On the other hand, the backflow prevention ring 331 is pushed forward by the pressure of the molding material sent forward along the spiral groove of the screw 330 when the screw 330 is rotated, and the opening position opens the flow path of the molding material. Advance to (see Figure 1). As a result, the molding material is sent to the front of the screw 330.

The backflow prevention ring 331 may be either a co-rotation type that rotates with the screw 330 or a non-co-rotation type that does not rotate with the screw 330.

The injection device 300 may have a drive source for advancing and retreating the backflow prevention ring 331 between the open position and the closed position.

The metering motor 340 rotates the screw 330. The drive 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 advances and retreats the screw 330. Between the injection motor 350 and the screw 330, a motion conversion mechanism or the like for converting the rotational motion of the injection motor 350 into the linear motion of the screw 330 is provided. The motion conversion mechanism has, for example, a screw shaft and a screw nut screwed onto the screw shaft. A ball, a roller, or the like may be provided between the screw shaft and the screw nut. The drive source for advancing and retreating 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 the pressure transmission path between the injection motor 350 and the screw 330 to detect the pressure acting on the pressure detector 360.

The pressure detector 360 sends a signal indicating the detection result to the control device 700. The detection result of the pressure detector 360 is used for controlling and monitoring the pressure received by the screw 330 from the molding material, the back pressure on the screw 330, the pressure acting on the molding material from the screw 330, and the like.

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

In the filling step, the injection motor 350 is driven to advance the screw 330 at a set speed, and the liquid molding material accumulated in front of the screw 330 is filled in the cavity space 14 in the mold apparatus 10. The position and speed of the screw 330 are detected by using, for example, the encoder 351 of the injection motor 350. The encoder 351 detects the rotation of the injection motor 350 and sends a signal indicating the detection result to the control device 700. When the position of the screw 330 reaches the set position, switching from the filling process to the pressure holding process (so-called V / P switching) is performed. The position where V / P switching is performed is also called the V / P switching position. The set speed of the screw 330 may be changed according to the position and time of the screw 330.

After the position of the screw 330 reaches the set position in the filling step, the screw 330 may be temporarily stopped at the set position, and then V / P switching may be performed. Immediately before the V / P switching, instead of stopping the screw 330, the screw 330 may be moved forward or backward at a slow speed.

In the pressure holding step, the injection motor 350 is driven to push the screw 330 forward, and the pressure of the molding material (hereinafter, also referred to as “holding pressure”) at the front end of the screw 330 is maintained at a set pressure in the cylinder 310. The remaining molding material is pushed toward the mold device 10. The shortage of molding material due to cooling shrinkage in the mold apparatus 10 can be replenished. The holding pressure is detected using, for example, a pressure detector 360. The pressure detector 360 sends 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 holding pressure step and the like.

In the pressure holding step, the molding material in the cavity space 14 in the mold apparatus 10 is gradually cooled, and when the pressure holding step is completed, the inlet of the cavity space 14 is closed with the solidified molding material. This state is called a gate seal, and the backflow of the molding material from the cavity space 14 is prevented. After the pressure holding step, the cooling step is started. In the cooling step, the molding material in the cavity space 14 is solidified. A weighing step may be performed during the cooling step to shorten the molding cycle.

In the weighing step, the weighing motor 340 is driven to rotate the screw 330 at a set rotation speed, and the molding material is fed forward along the spiral groove of the screw 330. Along with this, the molding material is gradually melted. As the liquid molding material is fed forward of the screw 330 and accumulated in the front of the cylinder 310, the screw 330 is retracted. The rotation speed of the screw 330 is detected by using, for example, the encoder 341 of the measuring motor 340. The encoder 341 sends a signal indicating the detection result to the control device 700.

In the weighing process, the injection motor 350 may be driven to apply a set back pressure to the screw 330 in order to limit the sudden retreat of the screw 330. The back pressure on the screw 330 is detected using, for example, a pressure detector 360. The pressure detector 360 sends a signal indicating the detection result to the control device 700. When the screw 330 retracts to the weighing completion position and a predetermined amount of molding material is accumulated in front of the screw 330, the weighing process is completed.

The injection device 300 of the present embodiment is an in-line screw type, but may be a pre-plastic type or the like. The pre-plastic injection device supplies the molded material melted in the plasticized cylinder to the injection cylinder, and injects the molding material from the injection cylinder into the mold device. A screw is rotatably or rotatably arranged in the plasticized cylinder and can be moved forward and backward, and a plunger is rotatably arranged in the injection cylinder.

(Mobile device)
In the description of the moving device 400, similarly to the description of the injection device 300, the moving direction of the screw 330 at the time of filling (left direction in FIGS. 1 and 2) is set to the front, and the moving direction of the screw 330 at the time of weighing (FIGS. 1 and 2). The right direction in FIG. 2) will be described as the rear.

The moving device 400 advances and retreats the injection device 300 with respect to the mold device 10. Further, the moving device 400 presses the nozzle 320 against the mold device 10 to generate a nozzle touch pressure. The moving device 400 includes a hydraulic pump 410, a motor 420 as a drive source, a hydraulic cylinder 430 as a hydraulic actuator, and the like.

The hydraulic pump 410 has a first port 411 and a second port 412. The hydraulic pump 410 is a pump that can rotate in both directions, and by switching the rotation direction of the motor 420, the hydraulic fluid (for example, oil) is sucked from one of the first port 411 and the second port 412 and discharged from the other. To generate hydraulic pressure. The hydraulic pump 410 can also suck the hydraulic fluid from the tank 413 and discharge the hydraulic fluid from either the first port 411 or the second port 412.

The motor 420 operates the hydraulic pump 410. The motor 420 drives the hydraulic pump 410 in the rotational direction and rotational torque according to the control signal from the control device 700. The motor 420 may be an electric motor or an electric servomotor.

The hydraulic cylinder 430 has a cylinder body 431, a piston 432, and a piston rod 433. The cylinder body 431 is fixed to the injection device 300. The piston 432 divides the inside of the cylinder body 431 into a front chamber 435 as a first chamber and a rear chamber 436 as a second chamber. The piston rod 433 is fixed to the fixed platen 110. Since the piston rod 433 penetrates the anterior chamber 435, the cross-sectional area of the anterior chamber 435 is smaller than the cross-sectional area of the rear chamber 436.

The front chamber 435 of the hydraulic cylinder 430 is connected to the first port 411 of the hydraulic pump 410 via the first flow path 401. The hydraulic fluid discharged from the first port 411 is supplied to the anterior chamber 435 via the first flow path 401, so that the injection device 300 is pushed forward. The injection device 300 is advanced and the nozzle 320 is pressed against the fixed mold 11. The anterior chamber 435 functions as a pressure chamber that generates a nozzle touch pressure of the nozzle 320 by the pressure of the hydraulic fluid supplied from the hydraulic pump 410.

On the other hand, the rear chamber 436 of the hydraulic cylinder 430 is connected to the second port 412 of the hydraulic pump 410 via the second flow path 402. The hydraulic fluid discharged from the second port 412 is supplied to the rear chamber 436 of the hydraulic cylinder 430 via the second flow path 402, so that the injection device 300 is pushed backward. The injection device 300 is retracted and the nozzle 320 is separated from the fixed mold 11.

The first relief valve 441 opens when the pressure in the first flow path 401 exceeds a set value, returns excess hydraulic fluid in the first flow path 401 to the tank 413, and returns the excess hydraulic fluid in the first flow path 401 to the first flow path 401. Keep the pressure below the set value.

The second relief valve 442 opens when the pressure in the second flow path 402 exceeds a set value, returns excess hydraulic fluid in the second flow path 402 to the tank 413, and returns the excess hydraulic fluid in the second flow path 402 to the second flow path 402. Keep the pressure below the set value.

The flushing valve 443 is a valve that adjusts the excess or deficiency of the circulating amount of the hydraulic fluid due to the difference between the cross-sectional area of the front chamber 435 and the cross-sectional area of the rear chamber 436. Position It consists of a 4-port spool valve.

The first check valve 451 opens when the pressure in the first flow path 401 is lower than the pressure in the tank 413, and supplies the hydraulic fluid from the tank 413 to the first flow path 401.

The second check valve 452 opens when the pressure in the second flow path 402 is lower than the pressure in the tank 413, and supplies the hydraulic fluid from the tank 413 to the second flow path 402.

The electromagnetic switching valve 453 is a control valve that controls the flow of the hydraulic fluid between the front chamber 435 of the hydraulic cylinder 430 and the first port 411 of the hydraulic pump 410. The electromagnetic switching valve 453 is provided in the middle of the first flow path 401, for example, and controls the flow of the hydraulic fluid in the first flow path 401.

The electromagnetic switching valve 453 is composed of a spool valve having two positions and two ports, as shown in FIGS. 1 and 2, for example. When the spool valve is in the first position (the position on the left side in FIGS. 1 and 2), flow in both directions between the anterior chamber 435 and the first port 411 is allowed. On the other hand, when the spool valve is in the second position (the position on the right side in FIGS. 1 and 2), the flow from the front chamber 435 to the first port 411 is restricted. In this case, the flow from the first port 411 to the anterior chamber 435 is not restricted, but may be restricted.

The first pressure detector 455 detects the hydraulic pressure in the anterior chamber 435. Since the nozzle touch pressure is generated by the hydraulic pressure of the anterior chamber 435, the nozzle touch pressure can be detected by using the first pressure detector 455. The first pressure detector 455 is provided, for example, in the middle of the first flow path 401, and is provided at a position on the front chamber 435 side with reference to the electromagnetic switching valve 453. The nozzle touch pressure can be detected regardless of the state of the electromagnetic switching valve 453.

The second pressure detector 456 is provided in the middle of the first flow path 401, and is provided at a position on the first port 411 side with reference to the electromagnetic switching valve 453. The second pressure detector 456 detects the hydraulic pressure between the electromagnetic switching valve 453 and the first port 411. When the electromagnetic switching valve 453 allows flow in both directions between the first port 411 and the front chamber 435, the hydraulic pressure between the first port 411 and the electromagnetic switching valve 453 and the electromagnetic switching valve 453 and the front Equal to the hydraulic pressure with and from chamber 435. Therefore, in this state, the nozzle touch pressure can be detected by using the second pressure detector 456.

In the present embodiment, the nozzle touch pressure is detected by using a pressure detector provided in the middle of the first flow path 401, but even if the nozzle touch pressure is detected by using a load cell or the like provided in the nozzle 320, for example. Good. That is, the pressure detector that detects the nozzle touch pressure may be provided in either the moving device 400 or the injection device 300.

In the present embodiment, the hydraulic cylinder 430 is used as the moving device 400, but the present invention is not limited to this.

(Control device)
As shown in FIGS. 1 and 2, the control device 700 includes a CPU (Central Processing Unit) 701, a storage medium 702 such as a memory, an input interface 703, and an output interface 704. The control device 700 performs various controls by causing the CPU 701 to execute the program stored in the storage medium 702. Further, the control device 700 receives a signal from the outside through the input interface 703 and transmits the signal to the outside through the output interface 704.

The control device 700 is connected to the operation device 750 and the display device 760. The operation device 750 receives an input operation by the user and outputs a signal corresponding to the input operation to the control device 700. The display device 760 displays an operation screen corresponding to an input operation in the operation device 750 under the control of the control device 700. The operation screen is used for setting an injection molding machine and the like. Multiple operation screens are prepared, and they can be switched and displayed or displayed in an overlapping manner. The user sets the injection molding machine (including input of the set value) by operating the operation device 750 while looking at the operation screen displayed on the display device 760. The operation device 750 and the display device 760 may be composed of, for example, a touch panel and may be integrated. Although the operation device 750 and the display device 760 of the present embodiment are integrated, they may be provided independently. Further, a plurality of operating devices 750 may be provided.

(Structure of injection device)
FIG. 3 is a top view showing an example of the structure of the injection device according to the embodiment. FIG. 4 is a cross-sectional view of the injection device along the IV-IV line of FIG. FIG. 5 is a cross-sectional view of the injection device along the VV line of FIG.

The injection device 300 has a front support 302 that holds the rear end of the cylinder 310, and a rear support 303 that is provided behind the front support 302. The front support 302 and the rear support 303 are fixed on the slide base 301.

A movable plate 304 is provided between the front support 302 and the rear support 303 so as to be able to move forward and backward. The guide 305 of the movable plate 304 is bridged between the front support 302 and the rear support 303. The guide 305 may be laid on the slide base 301.

The metering motor 340 may be assembled to the movable plate 304. The rotational movement of the metering motor 340 is transmitted to the screw 330 by a rotation transmission mechanism 342 such as a belt or a pulley. The metering motor 340 may be directly connected to the extension shaft of the screw 330, or may be arranged on the same straight line as the screw 330.

The injection motor 350 may be assembled to the rear support 303. The rotational motion of the injection motor 350 is converted into a linear motion of the movable plate 304 by the motion conversion mechanism 370, and then transmitted to the screw 330.

The motion conversion mechanism 370 is screwed into the rotation transmission shaft 371 rotated by the injection motor 350, the screw shaft 372 rotated by the rotation of the rotation transmission shaft 371, and the screw shaft 372, and advances and retreats by the rotation of the screw shaft 372. It has a screw nut 373 to be used.

The rotation transmission shaft 371 is spline-coupled to the rotor, for example, inside the rotor of the injection motor 350. The rotation transmission shaft 371 has a plurality of keys on the outer peripheral portion at intervals in the circumferential direction. On the other hand, the rotor of the injection motor 350 has a plurality of key grooves in the inner peripheral portion into which a plurality of keys are slidably inserted. The number of keys and the number of keyways may be one.

The rotation transmission shaft 371 of the present embodiment is spline-coupled to the rotor inside the rotor of the injection motor 350, but the present invention is not limited to this. For example, the rotation transmission shaft 371 may be coupled to the rotor of the injection motor 350 by a frictional force. In this case, a wedge or the like may be driven between the rotation transmission shaft 371 and the rotor.

The rotation transmission shaft 371 may be formed integrally with the screw shaft 372, or may be formed separately from the screw shaft 372 and connected to the screw shaft 372.

As shown in FIG. 5, the rotation transmission shaft 371 and the screw shaft 372 are rear-supported via the bearing 374, the first bearing holder 375 holding the outer ring of the bearing 374, and the second bearing holder 376 holding the inner ring of the bearing 374. It is rotatably assembled to 303 without advancing or retreating. On the other hand, the screw nut 373 is fixed to the movable plate 304.

The motion conversion mechanism assembly 377 is composed of a motion conversion mechanism 370, a bearing 374, a first bearing holder 375, a second bearing holder 376, and the like. The motion conversion mechanism assembly 377 is preassembled and then assembled to the rear support 303.

When the injection motor 350 is driven to rotate the rotation transmission shaft 371, the screw shaft 372 is rotated and the screw nut 373 is moved forward and backward. As a result, the movable plate 304 moves forward and backward, and the screw 330 moves forward and backward inside the cylinder 310.

As shown in FIG. 3, the injection motor 350 and the motion conversion mechanism 370 may be arranged symmetrically about the center line of the screw 330. The number of the injection motor 350 and the motion conversion mechanism 370 may be one, and the injection motor 350 and the motion conversion mechanism 370 may be arranged on the center line of the screw 330.

(Assembly of members to the rear support)
FIG. 6 is a diagram showing an assembling procedure of each member with respect to the rear support according to one embodiment. FIG. 6A shows a state before assembling each member with respect to the rear support, and FIG. 6B shows a motion conversion mechanism assembly inserted into the first assembly hole of the rear support shown in FIG. 6A. A diagram showing a state, FIG. 6 (c) is a diagram showing a state in which the rear support and the pressure detector shown in FIG. 6 (b) are in-row fitted and the pressure detector and the motion conversion mechanism assembly are in-row fitted. is there. FIG. 7 is a diagram showing a procedure for assembling each member with respect to the rear support following FIG. FIG. 7 (a) shows a state in which the pressure detector and the pressure detector retainer shown in FIG. 6 (c) are in-row fitted, and FIG. 7 (b) shows the pressure detector retainer shown in FIG. 7 (a). It is a figure which shows the state which the injection motor is in-row fitted and the rear support and a guide are in-row fitted. In FIGS. 6 and 7, the left side is the front and the right side is the rear. Hereinafter, the assembly of each member with respect to the rear support 303 will be described with reference to FIGS. 6 to 7, but before that, the in-row fitting will be described with reference to FIG.

FIG. 8 is a cross-sectional view showing first to sixth examples of inlay fitting between the first member and the second member. 8 (a) is a first example, FIG. 8 (b) is a second example, FIG. 8 (c) is a third example, FIG. 8 (d) is a fourth example, and FIG. 8 (e) is. A fifth example is shown in FIG. 8 (f). In FIG. 8, the left side is the front and the right side is the rear.

In the first example shown in FIG. 8A, the first member 910 has a plurality of hole wall surfaces 911 and 912 extending in the front-rear direction and a stepped surface 913 forming a step between the plurality of hole wall surfaces 911 and 912. Have. On the other hand, the second member 920 has a rear end surface 926 and an outer peripheral surface 921 extending forward from the rear end surface 926. The hole wall surface 911 on the front side of the first member 910 and the outer peripheral surface 921 of the second member 920 come into contact with each other, and the stepped surface 913 of the first member 910 and the rear end surface 926 of the second member 920 come into contact with each other.

In the second example shown in FIG. 8B, the first member 910 has a plurality of hole wall surfaces 911 and 912 extending in the front-rear direction and a stepped surface 913 forming a step between the plurality of hole wall surfaces 911 and 912. Have. On the other hand, the second member 920 has a front end surface 925 and an outer peripheral surface 921 extending rearward from the front end surface 925. The hole wall surface 912 on the rear side of the first member 910 and the outer peripheral surface 921 of the second member 920 come into contact with each other, and the stepped surface 913 of the first member 910 and the front end surface 925 of the second member 920 come into contact with each other.

In the third example shown in FIG. 8C, the first member 910 has a front end surface 915 and a hole wall surface 911 extending rearward from the front end surface 915. On the other hand, the second member 920 has a plurality of outer peripheral surfaces 921 and 922 extending in the front-rear direction and a stepped surface 923 forming a step between the plurality of outer peripheral surfaces 921 and 922. The hole wall surface 911 extending rearward from the front end surface 915 of the first member 910 and the outer peripheral surface 922 on the rear side of the second member 920 are in contact with each other, and the step surface of the front end surface 915 of the first member 910 and the second member 920. Contact with 923.

In the fourth example shown in FIG. 8D, the first member 910 has a rear end surface 916 and a hole wall surface 911 extending forward from the rear end surface 916. On the other hand, the second member 920 has a plurality of outer peripheral surfaces 921 and 922 extending in the front-rear direction and a stepped surface 923 forming a step between the plurality of outer peripheral surfaces 921 and 922. The hole wall surface 911 extending forward from the rear end surface 916 of the first member 910 and the outer peripheral surface 921 on the front side of the second member 920 are in contact with each other, and the step surface 923 of the rear end surface 916 of the first member 910 and the second member 920. Come in contact with.

In the fifth example shown in FIG. 8 (e), the first member 910 has a plurality of hole wall surfaces 911 and 912 extending in the front-rear direction and a stepped surface 913 forming a step between the plurality of hole wall surfaces 911 and 912. Have. On the other hand, the second member 920 has a plurality of outer peripheral surfaces 921 and 922 extending in the front-rear direction and a stepped surface 923 forming a step between the plurality of outer peripheral surfaces 921 and 922. The hole wall surface 912 on the rear side of the first member 910 and the outer peripheral surface 922 on the rear side of the second member 920 are in contact with each other, and the stepped surface 913 of the first member 910 and the stepped surface 923 of the second member 920 are in contact with each other. To do.

In the sixth example shown in FIG. 8 (f), the first member 910 has a plurality of hole wall surfaces 911 and 912 extending in the front-rear direction and a stepped surface 913 forming a step between the plurality of hole wall surfaces 911 and 912. Have. On the other hand, the second member 920 has a plurality of outer peripheral surfaces 921 and 922 extending in the front-rear direction and a stepped surface 923 forming a step between the plurality of outer peripheral surfaces 921 and 922. The hole wall surface 911 on the front side of the first member 910 and the outer peripheral surface 921 on the front side of the second member 920 come into contact with each other, and the stepped surface 913 of the first member 910 and the stepped surface 923 of the second member 920 come into contact with each other.

Next, assembling each member to the rear support 303 will be described with reference to FIGS. 6 to 7. In-row fitting is used for assembling each member. In FIGS. 6 to 7, a plurality of members are in-row fitted in order from the rear support 303. The assembly procedure is not limited to FIGS. 6 to 7.

As shown in FIG. 6A, the rear support 303 is formed with a first assembly hole 510 and a second assembly hole 520. The first assembly hole 510 is larger than the first hole wall surface 511 extending in the front-rear direction, the second hole wall surface 512 having a diameter larger than that of the first hole wall surface 511 and extending in the front-rear direction, and the second hole wall surface 512. A third hole wall surface 513 having a diameter and extending in the front-rear direction is provided in this order from the front side to the rear side. Further, the first assembly hole 510 has a step surface 514 forming a step between the first hole wall surface 511 and the second hole wall surface 512, and a step between the second hole wall surface 512 and the third hole wall surface 513. It has a stepped surface 515 forming the above. The motion conversion mechanism assembly 377, the pressure detector 360, the pressure detector retainer 361, and the injection motor 350 are assembled in the first assembly hole 510. The second assembly hole 520 is a straight hole extending in the front-rear direction, and has a hole wall surface 521 extending in the front-rear direction. A guide 305 is assembled in the second assembly hole 520.

First, as shown in FIG. 6B, the motion conversion mechanism assembly 377 is inserted into the first assembly hole 510 of the rear support 303.

Next, as shown in FIG. 6C, the rear support 303 and the pressure detector 360 are in-row fitted. The rear support 303 has a stepped surface 514 that forms a step between the first hole wall surface 511 and the second hole wall surface 512. The pressure detector 360 is formed in a ring shape and has a constricted portion between the inner peripheral portion and the outer peripheral portion. The pressure detector 360 has a front end surface 561 of the outer peripheral portion and an outer peripheral surface 562 extending rearward from the front end surface 561 thereof. The second hole wall surface 512 of the rear support 303 and the outer peripheral surface 562 of the pressure detector 360 are brought into contact with each other. Further, the stepped surface 514 of the rear support 303 and the front end surface 561 of the outer peripheral portion of the pressure detector 360 are brought into contact with each other. As a result, the pressure detector 360 is centered and positioned in the front-rear direction with respect to the first assembly hole 510 of the rear support 303.

Further, as shown in FIG. 6C, the motion conversion mechanism assembly 377 and the pressure detector 360 are in-row fitted. The first bearing holder 375 of the motion conversion mechanism assembly 377 has a plurality of outer peripheral surfaces 571 and 572 extending in the front-rear direction and a stepped surface 573 forming a step between the plurality of outer peripheral surfaces 571 and 572. On the other hand, the pressure detector 360 has a front end surface 563 of the inner peripheral portion and a hole wall surface 564 extending rearward from the front end surface 563. The hole wall surface 564 of the pressure detector 360 and the outer peripheral surface 572 on the rear side of the first bearing holder 375 are brought into contact with each other. Further, the front end surface 561 of the pressure detector 360 and the stepped surface 573 of the first bearing holder 375 are brought into contact with each other. As a result, the motion conversion mechanism assembly 377 is centered and positioned in the front-rear direction with respect to the first assembly hole 510 of the rear support 303.

Next, as shown in FIG. 7A, the pressure detector 360 and the pressure detector retainer 361 are in-row fitted. The pressure detector retainer 361 has a plurality of hole wall surfaces 581 and 582 extending in the front-rear direction and a step surface 583 forming a step between the plurality of hole wall surfaces 581 and 582. On the other hand, the pressure detector 360 has a rear end surface 565 of the outer peripheral portion and an outer peripheral surface 562 extending forward from the rear end surface 565. The hole wall surface 581 on the front side of the pressure detector retainer 361 and the outer peripheral surface 562 of the pressure detector 360 are brought into contact with each other. Further, the stepped surface 583 of the pressure detector retainer 361 and the rear end surface 565 of the outer peripheral portion of the pressure detector 360 are brought into contact with each other. As a result, the pressure detector retainer 361 is centered and positioned in the front-rear direction with respect to the first assembly hole 510 of the rear support 303. The pressure detector retainer 361 and the pressure detector 360 are fixed to the rear support 303 with, for example, bolts 362.

Next, as shown in FIG. 7B, the pressure detector retainer 361 and the injection motor 350 are in-row fitted. The injection motor 350 includes a stator 352, a rotor 353, a motor bearing 354 that rotatably supports the rotor 353 with respect to the stator 352, a front flange 355 that holds the front motor bearing 354, and a rear side. It has a rear flange 356 that holds the motor bearing 354. The stator 352 is sandwiched and held between the front flange 355 in front of the stator 352 and the rear flange 356 behind the stator 352. A rotation transmission shaft 371 is spline-coupled to the rotor 353. The front flange 355 of the injection motor 350 has a plurality of outer peripheral surfaces 551 and 552 extending in the front-rear direction and a stepped surface 553 forming a step between the plurality of outer peripheral surfaces 551 and 552. On the other hand, the pressure detector retainer 361 has a rear end surface 584 and a hole wall surface 585 extending forward from the rear end surface 584. The outer peripheral surface 551 on the front side of the front flange 355 and the hole wall surface 585 of the pressure detector retainer 361 are brought into contact with each other. Further, the stepped surface 553 of the front flange 355 and the rear end surface 584 of the pressure detector retainer 361 are brought into contact with each other. As a result, the injection motor 350 is centered and positioned in the front-rear direction with respect to the first assembly hole 510 of the rear support 303. The front flange 355 is fixed to the pressure detector retainer 361 with bolts or the like. The front flange 355 may be fixed to the rear support 303 with bolts or the like.

Further, as shown in FIG. 7B, the rear support 303 and the guide 305 are in-row fitted. The rear support 303 has a front end surface 501 and a hole wall surface 521 extending rearward from the front end surface 501. On the other hand, the guide 305 has a plurality of outer peripheral surfaces 506 and 507 extending in the front-rear direction and a stepped surface 508 forming a step between the plurality of outer peripheral surfaces 506 and 507. The hole wall surface 521 of the rear support 303 and the outer peripheral surface 507 on the rear side of the guide 305 are brought into contact with each other. Further, the front end surface 501 of the rear support 303 and the stepped surface 508 of the guide 305 are brought into contact with each other. As a result, the guide 305 is centered and positioned in the front-rear direction with respect to the second assembly hole 520 of the rear support 303.

In the present embodiment, the motion conversion mechanism assembly 377, the pressure detector 360, the pressure detector retainer 361, the injection motor 350, and the guide 305 are assembled to the rear support 303 in this order, but the assembly order is particularly particular. Not limited. For example, the guide 305 may be first assembled to the rear support 303.

As described above, according to the present embodiment, the rear support 303 and the members assembled to the rear support 303 (for example, the pressure detector 360 and the guide 305) are in-row fitted. As a result, the rear support 303 and the member assembled to the rear support 303 are centered and positioned in the front-rear direction. Therefore, the assembly accuracy can be improved, and the eccentric load due to misalignment or the like can be suppressed. In addition, the assembly work becomes easy.

Further, according to the present embodiment, a member (for example, pressure detector 360) in-row fitted to the rear support 303 is in-row fitted with yet another member (for example, motion conversion mechanism assembly 377 or pressure detector retainer 361). Will be done. This makes it possible to increase the number of members that are centered with the rear support 303 and positioned in the front-rear direction.

Further, according to the present embodiment, the pressure detector 360 is in-row fitted to the rear support 303. By centering the pressure detector 360, the detection accuracy of the pressure detector 360 can be improved. The pressure detector 360 may be in-row-fitted to a member that is in-row-fitted to the rear support 303, or may be in-row-fitted to one of a plurality of members that are in-row-fitted in order from the rear support 303. It may be fitted. In this case as well, the detection accuracy of the pressure detector 360 can be improved.

Furthermore, according to the present embodiment, the rear support 303 and the pressure detector 360 are in-row fitted, the pressure detector 360 and the pressure detector retainer 361 are in-row fitted, and the pressure detector retainer 361 and the injection motor 350 are combined. Is fitted in-row. That is, the injection motor 350 is in-row fitted to the pressure detector retainer 361 of the pressure detector 360 and the pressure detector retainer 361 which are in-row fitted in order from the rear support 303. As a result, the injection motor 350 is centered and positioned in the front-rear direction with respect to the first assembly hole 510 of the rear support 303. Further, according to the present embodiment, the rear support 303 and the pressure detector 360 are in-row fitted, and the pressure detector 360 and the motion conversion mechanism assembly 377 are in-row fitted. As a result, the motion conversion mechanism assembly 377 is centered and positioned in the front-rear direction with respect to the first assembly hole 510 of the rear support 303. As a result, the rotor of the injection motor 350, which is spline-coupled to each other, and the rotation transmission shaft 371 of the motion conversion mechanism assembly 377 are centered and positioned in the front-rear direction. Therefore, the eccentric load of the spline can be suppressed.

The motion conversion mechanism assembly 377 may be in-row-fitted to one of a plurality of members to be in-row-fitted in order from the rear support 303, similarly to the injection motor 350. Also in this case, the motion conversion mechanism assembly 377 is centered and positioned in the front-rear direction with respect to the first assembly hole 510 of the rear support 303. Further, the motion conversion mechanism assembly 377 may be in-row fitted to the rear support 303.

In this embodiment, the rear support 303 corresponds to the base described in the claims, and the injection motor 350 corresponds to the motor described in the claims. The injection motor 350, the motion conversion mechanism assembly 377, and the like may be assembled to the front support 302, in which case the front support 302 corresponds to the base described in the claims.

In the present embodiment, the pressure detector 360 is fitted in the rear support 303 in-law, but the pressure detector 360 may be provided between the screw nut 373 and the movable plate 304, as shown in FIG. The rear support 303 and the front flange 355 of the injection motor 350 may be in-row fitted, and the front flange 355 and the motion conversion mechanism assembly 377 may be in-row fitted. The motion conversion mechanism assembly 377 is composed of a motion conversion mechanism 370, a bearing 374, and a bearing holder 375. The rotation transmission shaft 371 and the screw shaft 372 are rotatably assembled to the rear support 303 via a bearing holder 375 that holds the bearing 374.

In the modified example shown in FIG. 9, the first assembly hole 510 of the rear support 303 has a first hole wall surface 511 extending in the front-rear direction and a second hole having a diameter larger than that of the first hole wall surface 511 and extending in the front-rear direction. The wall surface 512 is provided in this order from the front side to the rear side. Further, the first assembly hole 510 has a step surface 514 that forms a step between the first hole wall surface 511 and the second hole wall surface 512. On the other hand, the front flange 355 of the injection motor 350 has a front end surface 591 and an outer peripheral surface 592 extending rearward from the front end surface 591. The outer peripheral surface 592 of the front flange 355 and the second hole wall surface 512 of the rear support 303 are brought into contact with each other. Further, the front end surface 591 of the front flange 355 and the stepped surface 514 of the rear support 303 are brought into contact with each other. As a result, the injection motor 350 is centered and positioned in the front-rear direction with respect to the first assembly hole 510 of the rear support 303. The front flange 355 of the injection motor 350 is fixed to the rear support 303 with bolts 359 and the like.

Further, in the modified example shown in FIG. 9, the front flange 355 of the injection motor 350 has a plurality of hole wall surfaces 593 and 594 extending in the front-rear direction and a stepped surface 595 forming a step between the plurality of hole wall surfaces 593 and 594. Has. On the other hand, the bearing holder 375 of the motion conversion mechanism assembly 377 has a rear end surface 574 and an outer peripheral surface 575 extending forward from the rear end surface 574. The outer peripheral surface 575 of the bearing holder 375 and the hole wall surface 593 on the front side of the front flange 355 are brought into contact with each other. Further, the rear end surface 574 of the bearing holder 375 and the stepped surface 595 of the front flange 355 are brought into contact with each other. As a result, the motion conversion mechanism assembly 377 is centered and positioned in the front-rear direction with respect to the first assembly hole 510 of the rear support 303.

In the modified example shown in FIG. 9, the rear support 303 and the injection motor 350 are in-row fitted. As a result, the injection motor 350 is centered and positioned in the front-rear direction with respect to the first assembly hole 510 of the rear support 303. Further, in the modified example shown in FIG. 9, the injection motor 350 and the motion conversion mechanism assembly 377 are in-row fitted. As a result, the rotor of the injection motor 350, which is spline-coupled to each other, and the rotation transmission shaft 371 of the motion conversion mechanism assembly 377 are centered and positioned in the front-rear direction. Therefore, the eccentric load of the spline can be suppressed.

(Transformation and improvement)
Although the embodiments of the injection molding machine have been described above, the present invention is not limited to the above-described embodiments and the like, and various modifications are made within the scope of the gist of the present invention described in the claims. It can be improved.

In the above embodiment, an example in which the present invention is applied to the injection motor 350 has been described, but the present invention may be applied to other motors. Examples of motors to which the present invention can be applied include a mold clamping motor 160 and an ejector motor 210. The motor may move the screw nut screwed to the screw shaft forward and backward by rotating the screw shaft. When the present invention is applied to the mold clamping motor 160, the toggle support 130 corresponds to the base described in the claims. In this case, the accuracy of assembling various members to the toggle support 130 can be improved. Further, when the present invention is applied to the ejector motor 210, an ejector base (not shown) provided behind the movable platen 120 corresponds to the base described in the claims. In this case, the accuracy of assembling various members to the ejector base can be improved. The ejector base may be provided as a part of the movable platen 120.

100 Type clamping device 160 Type clamping motor 170 Motion conversion mechanism 171 Screw shaft 172 Screw nut 200 Ejector device 210 Ejector motor 220 Motion conversion mechanism 300 Injection device 302 Front support 303 Rear support 304 Movable plate 305 Guide 350 Injection motor 352 Fixture 353 Rotation Child 354 Motor bearing 355 Front flange 356 Rear flange 360 Pressure detector 361 Pressure detector retainer 370 Motion conversion mechanism 371 Rotation transmission shaft 372 Screw shaft 373 Screw nut 374 Bearing 375 First bearing holder 376 Second bearing holder 377 Motion conversion mechanism assembly

In order to solve the above problems, according to one aspect of the present invention,
A base motors and motion conversion mechanism for converting rotary motion into linear motion of the motor is assembled,
Equipped with a pressure detector that detects pressure,
An injection molding machine is provided in which the motor, the motion conversion mechanism, the pressure detector, and the base are assembled by in-row fitting.

Claims (5)

With the motor
A motion conversion mechanism including a screw shaft rotated by the motor and a screw nut screwed onto the screw shaft and moved forward and backward by the rotation of the screw shaft.
With a base to which the motor and the motion conversion mechanism are assembled
An injection molding machine in which the base and a member assembled to the base are in-row fitted. The injection molding machine according to claim 1, wherein the member to be in-row fitted to the base is in-row-fitted to another member. Cylinder and
It has a screw that is rotatably and movably arranged inside the cylinder.
The motor is an injection motor that advances and retreats the screw.
The injection molding machine according to claim 1 or 2, wherein the motion conversion mechanism converts the rotational motion of the injection motor into the linear motion of the screw. It has a pressure detector that detects the pressure transmitted between the injection motor and the screw.
The pressure detector is one of a plurality of members that are in-row-fitted to the base, in-row-fitted to a member that is in-row-fitted to the base, or in-row-fitted to the base in order. The injection molding machine according to claim 3, wherein the injection molding machine is in-row fitted to the member of the above. The injection motor is one of a plurality of members that are in-row-fitted to the base, in-row-fitted to a member that is in-row-fitted to the base, or in-row-fitted to the base in order. The injection molding machine according to claim 3 or 4, which is in-row fitted to the member.

Images