JP2016022606A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubrication oil feeding mechanism capable of maintaining a plain bearing into a state where a suitable amount of lubrication oil is stably fed into a plain bearing by a relatively simple constitution.SOLUTION: The lubrication oil feeding mechanism 8 of an injection molding machine at least comprises: an auxiliary oil tank 7B of a hydraulic system 7; an oil feed passage 30F provided at the supporting plate 30A of a back platen 30; and an air pressure piping 8A. The auxiliary tank 7B comprises: the main oil storage chamber 70A of feeding/exhausting working oil with the working oil chamber 6B of a mold fastening cylinder device 6; an auxiliary oil storage chamber 70B of temporarily storing the residual working oil in the main oil storage chamber 70A; and a piping port 70E provided at the bottom side of the auxiliary oil storage chamber 70B and having a stationary restriction. The supporting plate 30A is provided with an annular working shaft bearing 30C of supporting the working shaft 4. The lubricating oil is atomized by the stationary restriction in the piping port 70E of the auxiliary oil storage chamber 70B, is mixed with the gas in the air pressure piping 8A, passes through the feed path 30F and is fed into the working shaft bearing 30C.SELECTED DRAWING: Figure 2

Description

  The present invention is an injection molding machine having a hydraulic actuator and having a hydraulic system for controlling the hydraulic actuator by supplying hydraulic oil to the hydraulic actuator, and supplying the lubricating oil to the sliding bearing that supports and guides the shaft member The present invention relates to an injection molding machine equipped with a lubricating oil supply mechanism.

  The injection molding machine is to inject a molten material into a cavity formed by a pair of molds of a fixed mold and a movable mold and solidify it, and after the material has solidified, take out the molded product from the mold and collect it. It is configured so that a desired molded product can be continuously produced repeatedly. Therefore, an injection molding machine includes a mold opening / closing device for moving a movable mold to open and close a pair of molds, and a mold clamping device for closing the mold so that the mold does not open with the pressure of resin injected into the cavity. And. Hereinafter, the mold opening / closing device and the mold clamping device are collectively referred to as a mold moving device.

  The hydraulic mold moving device has a structure in which a movable platen is moved by a hydraulic actuator. For example, a movable platen is driven by moving a piston housed in a hydraulic cylinder by supplying and discharging hydraulic oil, and is moved relative to a movable mold and a fixed mold attached to the movable platen.

  The electric mold moving device has a structure in which a movable platen is moved by an electric actuator. For example, the rotational driving force of the servo motor is converted into a linear driving force through a transmission mechanism including a feed screw mechanism and transmitted to the operating shaft, and the movable mold attached to the movable platen is moved relative to the fixed mold. .

  A so-called hybrid mold moving device is known in which a mold opening / closing operation that requires high controllability and high responsiveness is performed by an electric actuator, and a mold clamping operation that requires high output is performed by a hydraulic actuator. The operation principle and the basic structure of are substantially the same as those of hydraulic and electric mold moving devices.

  By the way, in general, in a contact portion where a metal fixed member and a movable member are in contact with each other in a machine, the sliding bearing provided between the shaft member and the support member is abnormally consumed to shorten the service life or to blow powder. In order to prevent the operation failure of the movable member due to such alteration or corrosion, lubricating oil or oil-based lubricant is supplied to the sliding bearing. Also in the injection molding machine, for example, lubricating oil or a lubricant is supplied to a sliding bearing provided between an operating shaft of a movable platen and a support member.

  Since the contact portion where the fixed member and the movable member of the mold moving device are in contact with each other is often provided in a place where it is difficult for human hands to reach, it is not easy to supply the lubricating oil to the sliding bearing. Therefore, when maintenance work is performed, a large amount of lubricating oil must be supplied to the sliding bearing in advance, a highly viscous lubricant such as grease is used, or lubrication such as an oil-free bushing is used. Oil self-supplying bearings are used.

  However, if a large amount of lubricating oil is supplied to the sliding bearing, excess lubricating oil may leak out of the support member beyond the leakage prevention capability of the sliding bearing. In addition, a highly viscous lubricant may not be sufficiently spread over the entire sliding bearing, and replacement or replenishment work when the lubricant is deteriorated is not easy. In addition, even with a self-supplying type lubricant, there is a risk of running out of oil. For machines with many shaft movements, wear resistance can be maintained semi-permanently without maintenance work. It is difficult and relatively expensive, and there are significant restrictions on the installation environment.

  Patent document 1 is disclosing the spray oil supply apparatus which supplies lubricating oil to a bearing and a gear in the shape of a mist. Patent Document 2 discloses a lubricating device that supplies lubricating oil to a feed screw mechanism in an electric mold moving device. By using the inventions of Patent Document 1 and Patent Document 2 for a lubricating oil supply mechanism that supplies lubricating oil to a sliding bearing in an injection molding machine, an appropriate amount of lubricating oil is expected to be supplied to the sliding bearing without relying on human hands. it can.

Japanese Utility Model Publication No. 5-45393 JP 2003-220638 A

  In order to regularly supply an appropriate amount of lubricating oil at an appropriate timing by the lubricating oil supply device, a plurality of sensors and special control means capable of realizing an advanced lubricating oil supply system are required. For this reason, there is an increased risk of failure of the hydraulic system including the hydraulic cylinder device caused by the failure of the sensor or the control means, and the burden of work and cost required for maintenance management is further increased.

  In addition, in a well-known lubricating oil supply device that supplies hydraulic oil to a sliding bearing using hydraulic oil of a hydraulic actuator, it is necessary to obtain hydraulic oil used as lubricating oil from the middle of the high-pressure hydraulic circuit of the hydraulic system Therefore, apart from the piping that supplies the hydraulic oil to the hydraulic cylinder device, the piping that feeds the lubricating oil to the sliding bearings is required to have a strong structure that can withstand the high-pressure hydraulic fluid sufficiently. The

  In view of the above problems, it is a primary object of the present invention to provide an improved injection molding machine capable of maintaining a state where an appropriate amount of lubricating oil is stably supplied to a sliding bearing. In particular, the present invention provides an injection molding machine having a lubricating oil supply mechanism that stably supplies lubricating oil to a sliding bearing provided between an operating shaft connected to a movable platen and a back platen in a mold moving device. The purpose is to do. Some of the advantages that can be obtained by the present invention are more specifically shown in the description of the embodiments of the present invention.

  In order to achieve the above object, an injection molding machine according to the present invention is an injection molding machine equipped with a hydraulic system that controls a hydraulic actuator, and supplies hydraulic oil to and from a cylinder chamber (6B) of a hydraulic cylinder device (6). Provided on the bottom side of the auxiliary oil storage chamber (70B) and the auxiliary oil storage chamber (70B) for temporarily storing excess hydraulic oil in the main oil storage chamber (70A) and the main oil storage chamber (70A) to be supplied and discharged. A support member (30C) provided with an auxiliary oil tank (7B) including a pipe port (70E) having a fixed throttle, and a sliding bearing (30C) for supporting and guiding a shaft member (4) moving in a single linear direction. 30), an oil supply passage (30F) communicating between the shaft support side supporting the shaft member (4) and the outside, and a pneumatic pipe (8A) connecting the pipe port (70E) and the oil supply passage (30F). And a lubricating oil supply mechanism (8).

  Particularly, in the injection molding machine, the hydraulic cylinder device (6) is a mold clamping cylinder device of the mold moving device (1), and the shaft member (4) is an operating shaft that is connected to the movable platen (10), The support member (30) is a back platen.

  The reference numerals corresponding to the drawings shown in the parentheses are given for the convenience of description of the present invention, and the present invention is limited to the same injection molding machine as the specific embodiment shown in the drawings. It is not intended to be.

  The injection molding machine of the present invention uses an internal pressure that temporarily increases in an auxiliary oil tank of a hydraulic system to make the hydraulic oil into a mist for each molding cycle by the action of a fixed throttle and pneumatic piping at the piping port. A suitable amount can be supplied to the sliding bearing.

  This eliminates the need for a sensor and control means for periodically spraying an appropriate amount of lubricating oil and supplying it to the sliding bearing. In addition to the piping for supplying hydraulic oil, there is no need for a strong piping with high pressure resistance. As a result, the risk of failure of the hydraulic system is not increased, and the burden of work and costs required for maintenance is not increased so much. In addition, safety is high, and an increase in the manufacturing cost of the injection molding machine due to the installation of the lubricating oil supply mechanism can be suppressed.

It is sectional drawing of the longitudinal direction which shows the outline of the metal mold | die moving apparatus in the injection molding machine of this invention. It is sectional drawing of the longitudinal direction which shows typically the clamping cylinder apparatus in the metal mold | die moving apparatus shown by FIG. It is sectional drawing of the width direction of the mold clamping cylinder apparatus shown by FIG. FIG. 3 is a longitudinal sectional view schematically showing a supply state of hydraulic oil when the movable mold is in a mold closing limit position in the mold clamping cylinder device shown in FIG. 2. It is sectional drawing of the width direction of the clamping cylinder apparatus shown by FIG. FIG. 3 is a longitudinal sectional view schematically showing a supply state of hydraulic oil when the movable mold is in a mold open limit position in the mold clamping cylinder device shown in FIG. 2. It is sectional drawing of the width direction of the clamping cylinder apparatus shown by FIG.

  FIG. 1 shows an outline of the entire configuration of a mold moving device (clamping device) in an injection molding machine of the present invention. 1 to 3 show a hybrid mold moving device. 2 and 3 schematically show the clamping cylinder device and the lubricating oil supply mechanism in the mold moving device of the injection molding machine shown in FIG. Hereinafter, a preferred embodiment of an injection molding machine provided with a lubricating oil supply mechanism will be described in detail with reference to FIGS. 1 to 3.

  The injection molding machine including the hybrid mold moving device 1 is an injection molding machine including a hydraulic system that controls a hydraulic actuator. A mold moving device 1 of an injection molding machine shown in FIG. 1 includes a fixed platen 10 to which a fixed mold 2A of a pair of molds 2 is attached, and a movable platen 20 to which a movable mold 2B is attached to reciprocate. With.

  The fixed platen 10 is connected and fixed to the back platen 30 by the tie bar 3. The operating shaft 4, which is a shaft connected to the movable platen 20, moves in the direction of one straight line along its central axis. The movable platen 20 is guided by the tie bar 3 by the movement of the operating shaft 4 and reciprocates between the fixed platen 10 and the back platen 30.

  When the mold is opened and closed, the movable platen 20 reciprocates between the mold open position and the mold close position by a servo motor 5 that is an electric actuator of a drive device of the mold opening and closing device. During mold clamping, the movable platen 20 presses the movable mold 2B attached to the movable platen 20 against the fixed mold 2A attached to the fixed platen 10 by a hydraulic cylinder device that is a hydraulic actuator of a drive device of the mold clamping device. The mold clamping ram 40 is moved. The linear distance that the movable platen 20 can move in the direction of the fixed platen 10 by the mold clamping cylinder device 6 that is a hydraulic cylinder device is a slight mold clamping allowance (reduction) that depends on the stretchability of the tie bar 3 in the central axis direction. Stroke).

  The servo motor 5 is substantially provided on the back platen 30. In the mold moving device 1 of the embodiment shown in FIG. 1, the servo motor 5 is attached and fixed to the outer wall of the cylinder 6 </ b> A of the mold clamping cylinder device 6 that is provided integrally with the back platen 30. The rotational driving force of the servo motor 5 is transmitted to the ball screw mechanism 60 by the transmission mechanism 50. The ball screw mechanism 60 converts the rotational driving force obtained from the servo motor 5 into a linear driving force and transmits the driving force to the operating shaft 4.

  More specifically, the transmission mechanism 50 includes a drive pulley 50A, a driven pulley 50B, and a timing belt 50C. Further, the transmission mechanism 50 includes a clutch mechanism (not shown) that connects the drive shaft and the rotation shaft between the drive shaft of the servo motor 5 and the rotation shaft of the drive pulley 50A. Specifically, the ball screw mechanism 60 includes a ball screw 60A that is directly connected to the rotation shaft of the driven pulley 50B, and a nut 60B that is screwed to the ball screw 60A.

  The mold clamping cylinder device 6 is one of hydraulic cylinder devices. The mold clamping cylinder device 6 mainly includes a cylinder 6A, a hydraulic oil chamber 6B which is a cylinder chamber, a piston rod 6C partially including the operating shaft 4, and a piston head 6D. The mold clamping ram 40 is formed by the piston rod 6C and the piston head 6D. In the mold moving device 1 of the injection molding machine of the embodiment, the piston head 6D substantially corresponds to the nut 60B of the ball screw mechanism 60.

  When the servo motor 5 rotates, the ball screw 60A of the ball screw mechanism 60 rotates around the central axis, and the nut 6B that engages with the ball screw 60A moves in the direction of the central axis of the operating shaft 4. The operation shaft 4 is moved by the movement of the nut 6B corresponding to the piston head 6D of the clamping cylinder device 6 substantially fixed to the operation shaft 4, and the movable platen 20 connected to the operation shaft 4 is linearly uniaxially moved. Move to. Accordingly, when the servo motor 5 is driven in a predetermined forward rotation direction, the movable platen 20 goes straight in the direction of the fixed platen 10, and when the servo motor 5 is driven in the reverse rotation direction, the movable platen 20 goes straight in the direction of the back platen 30.

  The mold clamping cylinder device 6 introduces hydraulic oil of a predetermined pressure supplied from the main oil tank 7A of the hydraulic system 7 into the hydraulic oil chamber 6B which is a cylinder chamber, thereby fixing the mold clamping ram 40 which is a piston to the fixed platen 10. This is a single-acting cylinder device that moves forward in the direction of.

  As shown in FIG. 2, the back platen 30 is a support member that supports and guides the operating shaft 4, which is a shaft member that moves in the direction of one linear axis, by a sliding bearing. Specifically, the operation shaft 4 is supported and guided by an annular operation shaft bearing 30C such as a wear ring which is a sliding bearing provided in a through hole 30B formed in the support plate 30A of the back platen 30. .

  When operating the mold clamping cylinder device 6, the transmission mechanism 50 releases the connection between the servo motor 5 and the drive pulley 50 </ b> A, and the ball screw 60 </ b> A can rotate freely without being constrained by the servo motor 5. The hydraulic oil is supplied from the main oil tank 7A of the system 7 to the hydraulic oil chamber 6B of the clamping cylinder device 6. When high-pressure hydraulic oil is supplied from the main oil tank 7A to the hydraulic oil chamber 6B, the mold clamping ram 40 advances in the direction of the fixed platen 10 so that the movable platen 20 presses the fixed platen 10 by a predetermined mold clamping allowance. Move to.

  In the mold moving device 1 of the embodiment, at least a pair of oil supply ports 30D and oil discharge ports 30E are provided on the support plate 30A of the back platen 30 that supports the operation shaft 4 by the operation shaft bearing 30C. ing. The oil supply port 30 </ b> D is provided on the upper side of the support plate 30 </ b> A and is connected to the auxiliary oil tank 7 </ b> B of the hydraulic system 7. The oil discharge port 30 </ b> E is provided below the support plate 30 </ b> A and is connected to the main oil tank 7 </ b> A of the hydraulic system 7.

  The oil supply port 30D is supported so as to communicate between the shaft support side that supports the hydraulic oil 4 and the outside in the support plate 30A of the back platen 30 in which the hydraulic shaft bearing 30C that supports and guides the hydraulic oil 4 is provided. It is connected to an opening 30H on the inner wall on the upper side of the through hole 30B through an oil supply passage 30F provided in the plate 30A. Further, the oil discharge port 30E is connected to an opening 30J in the lower inner wall of the through hole 30B through an oil discharge passage 30G provided in the support plate 30A so as to communicate between the shaft support side and the outside.

  The hydraulic system 7 for supplying hydraulic oil to the mold clamping cylinder device 6 includes a main oil tank 7A provided at a position away from the mold moving device 1 and a cylinder of the mold clamping cylinder device 6 provided integrally with the back platen 30. And an auxiliary oil tank 7B provided on the upper side of 6A. The main oil tank 7A always stores hydraulic oil and supplies hydraulic oil having a predetermined pressure to the hydraulic oil chamber 6B of the mold clamping cylinder device 6 by a high-pressure pump (not shown). The auxiliary oil tank 7B temporarily stores a required amount of hydraulic oil so as to supply substantially normal pressure of hydraulic oil to the hydraulic oil chamber 6B or collect the compressed hydraulic oil from the hydraulic oil chamber 6B. .

  As shown in FIG. 3, the auxiliary oil tank 7B includes a main oil storage chamber 70A that supplies and discharges hydraulic oil to and from the hydraulic oil chamber 6B of the mold clamping cylinder device 6, and an excess operation of the main oil storage chamber 70A. It comprises a sub oil storage chamber 70B for temporarily storing oil and returning it to the main oil tank 7A. The auxiliary tank 7B is partitioned by a partition wall 70C so that the capacity of the main oil storage chamber 70A is sufficiently larger than the capacity of the sub oil storage chamber 70B.

  A communication path connected to the hydraulic oil chamber 6B of the mold clamping cylinder device 6 is provided on the bottom side of the main oil storage chamber 70A of the auxiliary oil tank 7B. Further, on the bottom side of the auxiliary oil storage chamber 70B, a piping port 70D for returning the hydraulic oil temporarily stored in the auxiliary oil storage chamber 70B to the main oil tank 7A, and a pneumatic piping of the lubricating oil supply mechanism 8 A piping port 70E connected to an oil supply passage 30F provided in the support plate 30A of the back platen 30 through 8A is provided.

  In the auxiliary oil tank 7B, a prefill valve 7C, which is a flow control valve, is provided in a communication path that communicates between the main oil storage chamber 70A and the hydraulic oil chamber 6B of the mold clamping cylinder device 6. By operating the opening and closing of the playfill valve 7C, the supply and discharge of the hydraulic oil in the hydraulic oil chamber 6B can be controlled. In the hydraulic system 7 according to the embodiment shown in FIGS. 2 and 3, an air breather 7D is provided for releasing the pressure applied to the auxiliary oil tank 7B and making the internal pressure of the auxiliary oil tank 6B normal. ing.

  In the auxiliary oil tank 7B, when the mold is closed, the prefill valve 7C is opened, and the hydraulic oil stored in the main oil storage chamber 70A is caused to flow into the hydraulic oil chamber 6B of the mold clamping cylinder device 6 so that the hydraulic oil chamber 6B is opened. Fill with hydraulic fluid. At the time of mold clamping, the prefill valve 7C is closed so that the hydraulic oil chamber 6B can be pressurized. When the mold is opened, the prefill valve 7C is opened so that the hydraulic oil compressed from the hydraulic oil chamber 6B can be returned to the main oil storage chamber 70A.

  The piping port 70E has a fixed throttle inside. More specifically, the fixed throttle attached to the pipe port 70E is configured to provide a male and female nipple having a screw hole into which a pipe screw is screwed inside the pipe port and attach a taper screw sink plug. In the embodiment, a narrow hole of 0.6 mmφ to 2.0 mmφ is formed in the taper screw sink plug of the fixed throttle of the piping port 70E. The female port of the pipe port 70E is connected to the oil supply path 30F from the oil supply port 30D provided in the support plate 30A of the back platen 30 through the pneumatic pipe 8A such as an air hose of the lubricating oil supply mechanism 8.

  The lubricating oil supply mechanism 8 includes at least an auxiliary oil tank 7B of the hydraulic system 7, a pneumatic pipe 8A, and an oil supply passage 30F provided on the support plate 30A of the back platen 30. The lubricating oil supply mechanism 8 atomizes the hydraulic oil and supplies it to the oil supply port 30D from the auxiliary oil tank 7B even when the hydraulic oil is not pressurized to a high pressure, and sprays the hydraulic oil onto the operating shaft 4 as the lubricating oil.

  4 to 7 schematically show a mold clamping cylinder device that is a hydraulic cylinder device and a lubricating oil supply mechanism. 4 to 7, for the sake of convenience, most members other than those related to the mold clamping cylinder device and the lubricating oil supply mechanism are not shown. The operations of the clamping cylinder device and the lubricating oil supply mechanism in the mold moving device of the embodiment will be described below with reference to FIGS.

  When starting one molding cycle, as shown in FIGS. 4 and 5, the prefill valve 7C is operated to operate the main oil storage chamber 70A of the auxiliary oil tank 7B and the hydraulic oil chamber 6B of the mold clamping cylinder device 6. Open the communication path between the two. Since the auxiliary oil tank 7B is provided on the upper side of the cylinder 6A, when the communication path is opened, normal pressure hydraulic oil flows from the main oil storage chamber 70A into the hydraulic oil chamber 6B, and the hydraulic oil chamber 6B Filled with hydraulic fluid.

  When the mold is closed during the molding cycle, the servo motor 5 is driven to rotate the ball screw 60 </ b> A of the ball screw mechanism 60 in the forward direction, and the nut 60 </ b> B of the ball screw mechanism 60 is moved toward the fixed platen 10. When the nut 60B moves in the direction of the fixed platen 10, the mold clamping ram 40 of the mold clamping cylinder device 6 including the nut 60B moves forward, and the moving shaft 4 including the piston rod 6C in the mold clamping ram 40 moves. The movable platen 20 connected to the shaft 4 moves in the direction of the fixed platen 10. As a result, the movable mold 2B attached to the movable platen 20 is joined to the fixed mold 2A attached to the fixed platen 10 at the mold open limit position.

  During this time, since the prefill valve 7C is open, as the mold clamping ram 40 moves forward, the volume of the hydraulic oil chamber 6B increases, and the flow from the main oil storage chamber 70A of the auxiliary oil tank 7B due to flow down and negative pressure. The hydraulic oil continues to flow into the hydraulic oil chamber 6B, and the hydraulic oil chamber 6B is always filled with the hydraulic oil regardless of the position of the piston head 6D of the mold clamping cylinder device 6. Therefore, as the mold clamping ram 40 of the mold clamping cylinder device 6 including the nut 60B of the ball screw mechanism 60 advances, the liquid level of the hydraulic oil stored in the main oil storage chamber 70A of the auxiliary oil tank 7B decreases.

  At the time of mold clamping during the molding cycle, the prefill valve 7C is operated to close the communication path between the main oil storage chamber 70A of the auxiliary oil tank 7B and the hydraulic oil chamber 6B of the mold clamping cylinder device 6, and the hydraulic oil Is prevented from flowing back from the hydraulic oil chamber 6B to the main oil storage chamber 70A. Then, the high-pressure pump is driven to inject the hydraulic oil having a predetermined pressure pressurized from the main oil tank 7A into the hydraulic oil chamber 6B. As a result, the pair of molds 2 are clamped by advancing in the direction of the fixed platen 10 by a small required mold clamping allowance to the mold clamping position where the mold clamping ram 40 cannot move.

  When the mold is opened during the molding cycle, as shown in FIGS. 6 and 7, the high-pressure pump is stopped to stop the supply of hydraulic oil, and the prefill valve 7C is operated to operate the main oil storage in the auxiliary oil tank 7B. The communication path between the chamber 70A and the hydraulic oil chamber 6B of the mold clamping cylinder device 6 is substantially opened. At this time, since the hydraulic oil in the hydraulic oil chamber 6B is compressed by the high-pressure hydraulic oil supplied from the main oil tank 7A, the hydraulic oil is released from the main oil tank 7A and the auxiliary oil tank 7B with the pressure released. Flow into.

  When the servo motor 5 is rotated in the reverse direction to rotate the ball screw 60A of the ball screw mechanism 60, the nut 60B screwed to the ball screw 60A moves in the direction of the transmission mechanism 50, in other words, the mold clamping ram 40 moves backward. . As the mold clamping ram 40 moves backward, the volume of the hydraulic oil chamber 6B decreases, so that the hydraulic oil remaining in the hydraulic oil chamber 6B further flows into the main oil tank 7A and the auxiliary oil tank 6B.

  At this time, the air in the auxiliary oil tank 7B is discharged from the air breather 7D provided on the upper side of the auxiliary oil tank 7B as the mold clamping ram 40 moves backward, but the auxiliary oil tank 7B is discharged by the discharge resistance of the air breather 7D. The inside is momentarily pressurized and the internal pressure of the auxiliary oil tank 7B temporarily rises.

  Between the main oil storage chamber 70A of the auxiliary oil tank 7B and the hydraulic oil chamber 6B rather than the flow rate per unit time of the hydraulic oil in the pipe connecting the main oil tank 7A and the hydraulic oil chamber 6B of the mold clamping cylinder device 6 Since the flow rate of the hydraulic oil per unit time in the communicating passage is larger, the hydraulic oil in the main oil storage chamber 70A overflows the partition oil 70C and overflows into the auxiliary oil storage chamber 70B as the mold clamping ram 40 moves backward. To do.

  Excess hydraulic oil that has flowed into the auxiliary oil storage chamber 70B of the auxiliary oil tank 7B is temporarily stored in the auxiliary oil storage chamber 70B for a short period of time. In addition, a small amount of hydraulic oil remains on the tapered screw sink plug in the fixed throttle of the piping port 70E provided on the bottom side of the auxiliary oil storage chamber 70B.

  Most of the hydraulic fluid that has flowed into the auxiliary oil storage chamber 70B is pushed out of the piping port 70D by the internal pressure temporarily increased in the auxiliary oil tank 7B and returned to the main oil tank 7A. At this time, a slight amount of hydraulic oil remaining on the taper screw sink plug in the fixed throttle of the piping port 70E is pushed out from the narrow hole to the pneumatic piping 8A of the lubricating oil supply mechanism 8 by the internal pressure. And mixed into the gas in the pneumatic pipe 8A. The hydraulic oil extruded into the pneumatic piping 8A and mixed with the gas is carried to the gas and reaches the oil supply port 30D provided in the support plate 30A of the back platen 30 together with the gas.

  The mist-like hydraulic oil that has been transported to the oil supply port 30D passes through a supply passage 30F provided in the support plate 30A, and serves as a lubricating oil from the opening 30H on the upper inner wall of the through hole 30B of the support plate 30A. Is injected into. Therefore, the lubricating oil spreads and adheres thinly on the outer peripheral surface of the operating shaft 4, and there is no possibility that the lubricating oil leaks out of the support plate 30A of the back platen 30 from the through hole 30B.

  Further, in the mold moving device 1 according to the embodiment, when the lubricating oil is periodically and repeatedly supplied, the lubricating oil around the operating shaft bearing 30C is accumulated and should exceed the necessary and sufficient amount by any chance. However, since the excess lubricating oil hangs down along the outer periphery of the hydraulic oil 4, it is configured to be introduced into the oil drain passage 30G from the opening 30J in the lower inner wall of the through hole 30B. The excess lubricating oil is returned from the oil discharge passage 30G to the main oil tank 7A, so that there is no possibility of leaking out from the support plate 30A.

  In the next molding cycle, the operating shaft bearing 30 </ b> C in which the lubricating oil sprayed to the outer peripheral surface of the operating shaft 4 as the moving shaft 4 moves during mold clamping is provided on the support plate 30 </ b> A of the back platen 30. Contact with. The lubricating oil that has come into contact with the operating shaft bearing 30C is supplied to the outer peripheral surface on the upper side of the operating shaft 4, so that it is uniformly supplied to the entire operating oil bearing 30C while moving down along the outer peripheral surface.

  As shown in the series of operations described above, in the mold moving device of the injection molding machine according to the embodiment, an appropriate amount of lubricating oil operates intermittently or periodically for each molding cycle without requiring manual labor. Supplied to the shaft bearing and no lubricating oil is lost. In the mold moving device of the injection molding machine according to the embodiment, an appropriate amount of lubricating oil can be supplied to the working shaft bearing using the existing mold moving device. In the injection molding machine of the embodiment, a lubricating oil supply mechanism for supplying lubricating oil to the operating shaft bearing in the mold moving device is shown. However, for other bearings that are required to supply lubricating oil. A similar configuration can be applied to supply the lubricating oil.

  The injection molding machine of the present invention is not limited to the same configuration as the injection molding machine of the embodiment specifically shown. The injection molding machine of the present invention can be implemented by appropriately modifying or combining the injection molding machines of the embodiments without departing from the technical idea of the present invention. For example, in the injection molding machine of the embodiment, a hybrid mold moving device is shown. However, if the injection molding machine is equipped with a hydraulic cylinder device, another driving type mold moving device is used. Can be applied to.

  The present invention can be used in an injection molding machine including a hydraulic system that controls a hydraulic actuator. In particular, it is useful for an injection molding machine having a sliding bearing that needs to be supplied with an appropriate amount of lubricating oil at all times. The present invention contributes to the development of injection molding technology.

1 Mold moving device (Clamping device)
2 Mold 2A Fixed mold 2B Moving mold 3 Tie bar 4 Operating shaft (shaft material)
5 Servo motor 6 Clamping cylinder device (hydraulic cylinder device)
6A Cylinder 6B Hydraulic oil chamber (cylinder chamber)
6C Piston rod 6D Piston head 7 Hydraulic system 7A Main oil tank 7B Auxiliary oil tank 7C Prefill valve 7D Air breather 8 Lubricating oil supply mechanism 8A Pneumatic piping 10 Fixed platen 20 Movable platen 30 Back platen 30A Support plate 30B Through hole 30C Actuating shaft bearing (Sliding bearing)
30D Oil supply port 30E Oil discharge port 30F Supply passage 30G Oil discharge passage 40 Mold clamping ram 50 Transmission mechanism 60 Feed screw mechanism 60A Ball screw 60B Nut 70A Main oil storage chamber 70B Sub oil storage chamber 70C Partition walls 70D, 70E Piping port

Claims (2)

  In an injection molding machine equipped with a hydraulic system that controls a hydraulic actuator, a main oil storage chamber that supplies and discharges hydraulic oil to and from a cylinder chamber of a hydraulic cylinder device and excess hydraulic oil in the main oil storage chamber are temporarily An auxiliary oil tank including an auxiliary oil storage chamber to be stored and a piping port provided on the bottom side of the auxiliary oil storage chamber and having a fixed throttle, and a slide bearing for supporting and guiding a shaft member moving in a linear one-axis direction are provided. Lubricating oil supply comprising: an oil supply passage communicating between a shaft support side supporting the shaft member and an outer side of the supporting member, and a pneumatic pipe connecting the pipe opening and the oil supply passage. An injection molding machine having a mechanism.   2. The injection molding machine according to claim 1, wherein the hydraulic cylinder device is a clamping cylinder device, the shaft member is an operating shaft connected to a movable platen, and the support member is a back platen. The injection molding machine described.

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