TW201228800A - Injection molding machine and hydraulic actuator - Google Patents

Abstract

Hydraulic actuators 100BL, 100BR move an injection device 20 up and down. Each comprises a hydraulic cylinder 1BL, 1BR having a rod side oil chamber 1BLc, 1BRc and a head side oil chamber 1BLb, 1BRb isolated by a piston 1BLa, 1BRa and receiving a self weight pressure of the injection device 20 through use of oil in the head side oil chamber 1BLb, 1BRb, the dual directional hydraulic pump, one port of which is fluidly connected to the rod side oil chamber 1BLc, 1BRc, the other of witch is fluidly connected to the head side oil chamber 1BLb, 1BRb, and the electric motor for driving the dual directional hydraulic pump, wherein the electric motor drives the dual directional hydraulic pump against pressure of the oil in the head side oil chamber 1BLb, 1BRb which receives the self weight pressure of the injection device 20.

Description

201228800 200 : Injection molding machine. Dropout: 5. If there is a chemical formula in this case, please reveal the best indication of the characteristics of the invention. CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority to Japanese Patent Application No. 2G1 0-23592G, filed on Jan. 20, 2010. The entire contents of the application are used in this specification by ^ test aid. The present invention relates to a hydraulically driven portion that moves up and down. The pressure-driven state is particularly related to a rod-side oil chamber and a head-side oil chamber having a cylinder inner wall and a piston, and a rod side thereof. The oil pressure in the oil chamber or the oil chamber in the head side of the oil chamber is subjected to a single-lever hydraulic pressure of the driven portion, and the oil pressure driver and the injection molding machine including the hydraulic actuator. [Prior Art] Conventionally, it is known that there is a pressure of the self-weight of the driven oil in the oil chamber of the rod side, which is the pressure of the self-weight of the driven portion. In the single-cylinder hydraulic pressure, the driven portion is moved up and down by the hydraulic pressure discharged from the pump by the oil pump (see, for example, Patent Document 1). In the hydraulic drive device, the electromagnetic flow rate is adjusted to be connected to the working oil return passage of the 201228800, from the oil side chamber of the fort red, to limit the flow of the working oil flowing out of the oil chamber of the rod side, so as not to face the rod The extension speed below is too large. In the first aspect, the schematic view of the configuration of a conventional hydraulic actuator disclosed in Patent Document 1 is shown. The hydraulic actuator 5G is composed of a hydraulic red 1 as a stationary member, a head side oil chamber 1b and a rod side oil chamber 1c divided by a piston la and an inner wall of the cylinder, an electric motor 2, and a hydraulic pump 3, which are driven by an electric motor. 2 drive, the suction port is in communication with the pressure oil tank τ, and the discharge port is in communication with the head side oil chamber 1b of the hydraulic cylinder 1; the rod 4 as a movable member extends from the lower portion of the movable shaft and holds the driven portion ^ Position sensor 5, the position of the dry 4, the flow control valve 6, is switched by the hydraulic system 3: the flow direction of the oil and the control flows into the hydraulic cylinder (the flow rate of the working oil, the control device 7, borrowing The electric motor 2 and the flow rate control valve 6 are controlled by the output of the position sensor 5; the back pressure valve 8' is connected to the flow control (4) 6 when the pressure in the rod side oil chamber 1 is equal to or greater than a predetermined value. When the (four) force in the rod side oil chamber 1c is less than a predetermined value, the rod side oil chamber ^ and the flow control valve 6 are cut off; and the check valve 9 is not only from the # side oil chamber ic to the flow control valve 6 Flowing and allowing flow from the flow control 6 to the rod side oil chamber le. The control device 7 is calculated by the head side oil chamber _ cross-sectional area Calculating the flow rate of the hydraulic oil that is required to lower the driven portion w at a desired speed and entering the head-side oil chamber, and outputting a control signal to the electric motor 2 and the two-control room 6 according to the calculated flow rate. In order to control the flow into the head side oil ~ 201228800 * The flow rate of the working oil is lowered at the desired speed by the drive unit w (Prior Art Document) (Patent Document) Patent Document 1: Japanese Special Kaiping u_2872〇6 Bulletin L (Problems to be Solved by the Invention) However, in order to lower the driven portion W at an appropriate speed, the conventional oil hopper driver 5 described in Patent Document 1 needs to use an electromagnetic flow regulating valve or a back pressure valve 8 In addition, it is necessary to constantly generate a force against the driven portion w that is intended to fall naturally due to gravity in the return path of the working oil, and therefore, there is a problem in energy efficiency." The object of the present invention is to provide an ability to provide A hydraulic actuator that moves up and down more efficiently and an injection molding machine that has its hydraulic actuator. (Means for solving the problem) The injury system achieves the above purpose. In the embodiment of the invention, the injection molding machine is driven by the driving portion to move up and down, and is characterized in that it is injurious: the vehicle pole is red, and the right-hander strikes: the eight/soil-side rod side oil chamber and the head side In the oil chamber, the oil in the oil chamber in the two sides or the oil chamber in the head side is subjected to the self-respecting of the driven portion, to a part; the two-way hydraulic pump, one of which, ... the rod side oil of the rod cylinder胄 σ 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 σ σ σ σ σ σ σ σ σ σ σ σ σ σ σ σ σ σ σ σ σ σ σ σ σ σ σ σ The oil pressure is multiplied by 'to resist at least the pressure of the oil that is subjected to the self-weight of the driven portion, and the outflow pressure of the oil in the rod side oil chamber or the head side oil chamber. Further, the hydraulic actuator according to the embodiment of the present invention moves the driven portion up and down. The feature is: a single rod cylinder having a rod side oil divided by a piston and a head side oil t, and is located in the rod side oil chamber Or the oil in the head side oil chamber is subjected to at least a portion of the self-weight pressure of the driven portion ^), the bidirectional hydraulic pump, the square 'port and the single rod cylinder a rod side oil chamber is in communication, the other port is in communication with the single rod red head side oil chamber; and a motor drives the bidirectional hydraulic pump, wherein the motor drives the bidirectional hydraulic system to resist the bearing The outflow pressure of the oil in the rod side oil chamber or the head side oil chamber of at least a portion of the self-weight pressure of the driven portion. (Effect of the Invention) According to the above aspect, the present invention can provide a hydraulic actuator capable of moving the driven portion more efficiently up and down and an injection molding machine including the hydraulic actuator. [Embodiment] Hereinafter, embodiments of the invention will be described with reference to the accompanying drawings. Fig. 2 is a schematic view showing a configuration example of a hydraulic actuator 1 本 according to an embodiment of the present invention. In Fig. 2, the same structure as the conventional hydraulic actuator has the same reference numeral symbol. The oil migration drive 100 can be applied to a vertical injection molding machine, an oil rushing device or an oil I lifting device, etc., which adopts a closed circuit driving mode, which mainly includes: the oil-receiving cylinder 1' has a piston la and Red inner wall dicing head side oil chamber lb and rod side oil chamber 1c '·electric motor 2; rod 4 extending from piston la to vertical and holding driven portion $; position sensor $ detecting rod 4 position Two-way oil pump 10; flushing 阙 in inspection room 12L: 12R; safety valves 13L, 13K; control device 14; and liquid filling valve 15. The gray bi-directional hydraulic pump 10 is driven by the electric motor 2, and the first port thereof communicates with the head-side oil chamber 1b of the oil cylinder 1, and the straight oil chamber ic communicates. The rod side of the m...oil...the two U system is used to connect the head side oil chamber 1b of the oil seat cylinder 1 and the double, the first port of the pump, and the connecting rod side oil chamber ic oil pressure fruit 10 The 2nd end direction is the one-position four-port slide valve that connects the pipeline with the low pressure in the pipeline with low pressure. Check valve 1 2L # per $, 丄r~ Line connection oil tank μ head side oil chamber pressure pump 1 〇 in the first port of the pipeline & A + door oil with ... The pressure in the official road is less than the tank η When pressure is applied, it is used to supply the working oil to the pipeline. Check that the h 4 1C of the second port of the pressure pump 10 connected to the hydraulic cylinder and the pressure in the official road of the two-way oil port are smaller than the tank for supplying the working oil from the tank η to the pipeline. Read '. Safe reading when connecting the oil pressure red 1 head side oil chamber (four) two-way oil 201228800 The first port of the pumping 10 is in the pipeline, the rabbit box ~ the supervisory force on the mine is above the pre-pressure The valve for returning the working oil in the pipe to the tank T1. The relief valve 13R is a predetermined pressure in the line connecting the hydraulic rod side oil t Ic and the second port of the bidirectional hydraulic pump 10 When the pressure is equal to or higher, it is used to flow the working oil in the pipe back to the tank T1. The control device 14 is a device for controlling various components of the hydraulic actuator ,, for example, having a CPU (CentralPr〇cessingUnit) A computer such as a RAM (Random Access Memory) ROM (Read Only Memory) performs various calculations on the CPU, and controls the electric motor 2 and the liquid filling valve 15 to specifically control the drive unit W when it is lowered. The device 14 calculates the current position (height) and operation of the driven portion w detected by the position sensor 5. The driver inputs a difference Δ〇 (〇!〇, and determines the difference Δ£) (cm) of the target position (south degree) of the driven portion w by an input device (not shown). The target descending speed of W is (cm/sec). Thereafter, the control device 14 multiplies the determined target descending speed V (cm/sec) of the driven portion w by the intercept of the rod side oil chamber 1c of the hydraulic cylinder 1. The target flow rate q (cm3/sec) is derived from the area a (cm2). Thereafter, the control device 14 divides the target flow rate Q (cm3/sec) by the discharge amount q (cmV revolution of each rotation of the bidirectional hydraulic pressure 杲1 0). Number) derives the target number of revolutions N (rps (revolution per second): the number of revolutions per second), and outputs the 201228800 control signal corresponding to the target number of revolutions n (rps) derived from the electric motor 2 (motor rotation command value ^ When the control device is the same, the control device u determines the wearing area (10) of the rod side oil chamber lc of the hydraulic cylinder 1 when determining the second rise. The control signal for the rotation of the electric motor 2 (motor rotation command value) is calculated. And, when the two-way oil I 10 is rotated, the working oil is sucked from the rod side oil chamber U and the working oil is discharged toward the head side oil to the lb. At this time, the control device outputs a preset control signal to the priming valve 15 (described later) to output the control signal to the first set position so that the pressure in the head side oil chamber 1b of the hydraulic cylinder 1 is less than When the pressure of the tank T2 is applied, the spoon replenishes the working oil from the tank T2 to the tank head side oil chamber ib. In addition, the tank T2 can be integrated with one tank Τ1 or can be divided. On the other hand, when rotating the two-way field When the pump 10 sucks the hydraulic oil from the head side oil chamber i and discharges the hydraulic oil toward the rod side oil chamber, the control device 14 rotates a predetermined control signal to the liquid filling valve 15 to set the set position to the second set position, so that the pump 10 can The working oil from the item side oil to lb is discharged toward the tank T2. The filling valve 15 is used to control the sliding of the two-position two-port of the flow of the working oil between the taper tank T2 and the head side oil chamber lb, by the control signal from the control unit 14 to switch the position. When the pressure in the head side oil chamber main ib of the hydraulic cylinder 1 is less than the pressure of the tank T2, the first set position (right side in the figure) of the filling valve 15 can replenish the working oil from the tank T2 to the head side oil chamber. Lb. Further, the 9.5th position (left side in the figure) of the filling valve 15 connects the head 201228800 side oil chamber lb and the can 2 so that the working oil can flow between the two. Further, the liquid filling valve 15 can be constituted by a guide type having a function similar to that of the first setting position and the second setting position. Next, with reference to Figs. 3 and 4, the operation of the hydraulic actuator 100 when the driven portion w is moved up and down will be described. First, the operation of the hydraulic actuator 100 when the driven brake w is lowered will be described with reference to Fig. 3 . The operator inputs the current position (height) of the driven portion w by the input device (not shown in FIG. Month] position (south degree) and calculate the difference (cm) between the current position (two degrees) and the target position (height), and the target descending speed (cm/sec) is determined according to the magnitude of the difference. Thereafter, the control device 14 determines The target descending speed V (cm/sec) of the broken drive portion W is multiplied by the hydraulic cylinder

, the cross-sectional area A (cm ) of the buckle side oil chamber 1c of .s is derived from the target flow rate q ( cn] 3 ^ ^ ; the target flow rate Q (cm 3 / sec) is divided by the each rotation of the bi-directional hydraulic pump 10 < The amount of soil Q (cm3/number of revolutions) is derived from the target number of revolutions N ( rps ), and the output of the electric motor 2 corresponds to the target number of revolutions N (rps) derived from 1 (the motor rotation command value). The motor 2 rotates and drives the two-way hydraulic pump 1 旋转 at a speed rotated by a motor rotation command value to cause work

It is sucked from the rod side oil chamber 1C of the hydraulic cylinder 1 (refer to the arrow AR1 and following ±0 ^ ; and the hydraulic oil sucked out is directed toward the head phase of the hydraulic cylinder i, and is discharged to the lb (refer to the arrow ar3). 201228800 At this time, the pressure in the rod side oil chamber lc (the pressure in the line connecting the suction side port of the bidirectional hydraulic pump 1 和 and the rod side oil chamber 丨c) is subjected to the self-weight pressure of the breaking drive portion w. And the pressure is higher than the predetermined value, so the flushing width 11 is moved to the left side of the figure (refer to the arrow AR4.), and the discharge side end 连接 and the head side oil chamber lb^f connecting the bidirectional hydraulic pressure I 10 are connected to Therefore, when the distance between the bi-directional hydraulic pump 10 and the head side oil chamber lb is long and the pressure loss therebetween is large, the working oil discharged from the bi-directional hydraulic pump 10 does not reach the head side oil. The chamber lb is discharged to the tank τι by the flushing valve u (refer to arrows AR5 to AR8.) On the other hand, the supply of the working oil from the bi-directional hydraulic pump 10 is interrupted by the head side oil chamber lb due to its internal The pressure is lowered, and the working oil is replenished from the tank T2 by the filling valve 15 located at the [set position] (refer to the arrow) The head AR9.) Thereby, the filling valve 15 can absorb the difference between the amount of working oil flowing into the head side oil chamber lb and the amount of working oil flowing out from the rod side oil chamber 丨c (inflow to the head side oil chamber lb) The amount of oil is less than the amount of working oil flowing out from the rod side oil chamber.) In addition, when the distance between the two-way hydraulic pump 10 and the head side oil chamber lb is relatively small and the pressure loss between them is small, the two-way The operation of the hydraulic pump 丨〇 spout is not discharged to the tank T1 by the flush valve 11, but is supplied to the head side oil chamber lb ° even if it is taken here, because the oil chamber lb_ area is larger than the rod side oil chamber The cross-sectional area of Bu, the oil volume of the working oil discharged by the two-way hydraulic pump 1〇 cannot be completed. 11 201228800 The full filling area fills the volume of the head side oil chamber ib which increases with the decrease of the rod 4, and therefore the bidirectional oil pressure When the working oil discharged by the ig is discharged to the tank T1 by the flushing valve u, the working oil is replenished from the tank T2 to the head side oil chamber lb by the filling valve 15 located at the first set position (refer to the arrow AR9.) The control device 14 rotationally drives the bi-directional hydraulic pump 1〇 so as to suppress the descending speed of the driven portion f, and sucks the rod side oil. Since the hydraulic oil in the & is capable of absorbing the self-weight pressure of the driven portion w and appropriately controlling the descending speed of the driven portion W. Next, referring to Fig. 4 and the hydraulic actuator 100 when the driven portion w is raised The operation is explained. When the operator inputs the position (South) of the driven portion W by the input device (not shown), the control device i 4 detects the driven portion based on the output of the position sensor 5 The current position (height) of W calculates the difference (cm) between the current position (height) and the target position (Gaotang) 夕#, , and the door degree, and determines the target ascending speed (cm/sec) by the magnitude of the difference. Thereafter, the control device 14 multiplies the target moving speed V (cm/sec) of the driven portion w by the cross-sectional area a U0 of the rod side oil chamber ^ of the oil cylinder i to derive the target flow rate 嶋 second), and the target flow rate is obtained. —3/sec. The target number of revolutions N (rpS) is derived by dividing the discharge amount q (cm3/revolution) of each rotation of the two-way hydraulic pump 1〇, and the target motor number N derived therefrom is output to the electric motor 2 ( Rps) corresponds to the control signal (motor rotation command value). The electric motor 2 is rotated by the speed of the motor rotation command value

S 12 201228800 Rotary drive two-way hydraulic pump, so that the head side oil chamber lb of the hydraulic cylinder 1

And out (refer to the arrow side oil chamber of the arrow AR1〇 and A) and let the hydraulic oil sucked out toward the hydraulic cylinder! From the finger, 丄, 疋, the oil AR13 〇C spit out (refer to the arrow AR12 and at this time' because of the pressure in the rod side oil chamber lc (connecting the bidirectional hydraulic system to the side port and the rod side oil chamber 1c) The pressure in the pipe line is higher than the predetermined value by the discharge & the pressure exceeding the self-weight of the driven portion W. Therefore, the same as the case where the driven portion W is lowered, the driver's sweat valve 11 is broken. On the left side (refer to the arrow AR14.), the pipe connecting the suction side port of the two-way hydraulic pump 1〇 and the head side oil chamber lb is connected to the tank τι. A portion of the working oil from which the cone flows out of the head side oil does not pass to the hydraulic pump 1 again. It is sent to the rod side oil chamber lc, but is sent out to the tank T1 by the flushing valve (10) (refer to arrows AR15 to AR18.) Θ This is to absorb the amount of oil flowing out from the head side oil chamber lb and flow into the "oil chamber". The difference in the amount of working oil of 1c (the amount of working oil flowing out from the head side oil chamber ^ is more than the amount of working oil flowing into the rod side oil chamber 丨c), and the head side oil chamber which is reduced from the volume thereof as the rod 4 rises A portion of the working oil flowing out of the lb is discharged to the tank T2 through the liquid filling valve 位于 located at the second setting position (refer to the arrow aR19.). The portion of the working oil flowing from the side oil to the lb 'passes through the flushing valve 11 is the same as when discharging to the tank T1 is to absorb the difference between the amount of working oil flowing into the rod side oil chamber from the working oil flowing out from the head side oil chamber b (the amount of working oil flowing out from the head side oil 13 201228800 chamber 1 b is more than The amount of working oil flowing into the rod side oil chamber 1 c). Thus, the control device 14 can absorb the difference between the work/amount of the flow from the head side oil chamber 1b and the amount of the working oil flowing into the rod side oil chamber 丨c, and appropriately control the rising speed of the driven portion W. With the above configuration, the hydraulic actuator 丨〇〇 can omit the back pressure valve mounted on the conventional hydraulic actuator 50, and by omitting the back pressure valve, the head required to exceed the pressure reduction of the back pressure valve can be omitted. The pressurization of the side oil chamber ib causes the driven portion w to move up and down more efficiently without causing any pressure loss. Next, the hydraulic actuator 100A according to another embodiment of the present invention will be described with reference to 帛5 mesh. The difference between the hydraulic actuator 100A and the hydraulic drive g 1 在于 differs in the arrangement of the hydraulic pressure 1A, the rod 4A, and the driven portion w, but is otherwise the same. This is omitted from the description of the same parts, and the differences are explained in detail. The hydraulic cylinder 1A has a head side oil lAb divided by the piston 1Aa and the inner wall of the cylinder, and a rod side oil chamber 1Ac 'the head side oil chamber Ub communicates with the middle side port of the bidirectional hydraulic pump u, and the rod side oil 胄 1 Ac* bidirectional The port of the oil pressure spring is connected. The rod 4A is the same as the rod * as the movable member in the hydraulic actuator 1A, and is a stationary member in which the upper end is fixed to the external stationary member. On the other hand, the hydraulic cylinder 1A is different from the hydraulic cylinder 1 in the hydraulic drive Lei 100 as the stationary hydraulic cylinder 1 of the 201228800 component. The rod 4A with respect to the stationary member can be fixed to the lower end of the vertically movable cylinder 1A by the driving portion w, and can be moved up and down with respect to the rod with the hydraulic cylinder 1A. The upper side of the moving member 4A moves the hydraulic pressure. The one-side oil chamber Uc is disposed on the head side oil tub, and the buckle side oil chamber 1Ac receives the self-weight of the driven portion w. Will change 'with hydraulic drive 10'. When the time is the same, the surface area of the rod side oil chamber Uc multiplied by the hydraulic pressure MA by the driving unit W is lowered, and the driven unit W is lowered by the driving unit W. AW) After deriving the target flow 嶋 second), divide the target flow rate Q (cm3/sec) by the discharge amount q (cmV revolutions) of each rotation of the oil M10 to derive the target number of revolutions N (rPS) 'and The electric motor 2 outputs a control signal (motor rotation command value) corresponding to the target number of revolutions derived therefrom. The same applies when the driven portion W is raised. According to the above configuration, the hydraulic actuator 丨00A and the hydraulic actuator i00 do not cause excessive pressure loss, so that the driven portion W can move up and down more efficiently. Further, the hydraulic actuators 100 and 100A support the self-weight of the driven portion W by the oil in the rod side oil chambers lc and 1Ac. However, the invention is not limited thereto. / The repeatedly driven devices 100 and 100A may be configured such that the oil in the head side oil chambers ib and 1Ab receives the self-weight pressure of the driven portion W. 15 201228800 and 'Reference to Fig. 6 and the application of the hydraulic actuator of the embodiment of the present invention to the injection molding machine is further extended. In addition, Fig. 6 is a view showing a configuration example of an injection molding machine 2A having the oil-changing dynamics of the embodiment of the present invention. The injection molding machine 200 mainly includes a θ s s on Μ 匕 匕 射 ejection device 20 and a clamping device 3 〇. Fig. 6 (1) shows a side view of the injection J (1) 卬 卬 200 in the state where the injection device 2 〇 is raised and the mold clamping device 30 is in the mold opening state, and Fig. 6 (B) shows the skin separation of the injection device 20 The injection molding machine 2 υ υ w恻 view of the yak < state and the clamping device 3 〇 is in the closed state. Fig. 6(c) is a top view of the support plate 43 which will be described later. In addition, the hatched portions in Figs. 6(1) and 6(1) indicate that the portion is a partial cross-sectional view. The injection device 2G melts or plasticizes the resin supplied through the hopper 21 as a resin supply device in the shooting cylinder 22. Specifically, the device 2 is injected. A screw (not shown) is used to feed the screw (not shown) to the nozzle (not shown) and feed the resin to the nozzle portion 23 located at the tip end of the emission rainbow u. In the present embodiment, the injection device of the hydraulic actuator 10B driving unit W functions as the hydraulic actuator of the present invention, and 100BR is held as the set 20 and moved up and down on the mold clamping device 3〇. . Hydraulic actuator The head side of the inner wall division The hydraulic cylinder 1BL of the l〇〇BL of the actuator 100BR has a piston 1BU, a cylinder chamber lBLb, and a rod side oil chamber 1BLc. In addition, the oil pressure oil red 1BR has the oil chamber 1 BRb and the rod side oil chamber of the head side of 201228800 divided by the piston 1 and the red inner wall! BRc. The injection device 20 is fixed to the rods 4BL and 4BR extending vertically upward from the piston 1BLa and the piston IBRa by the attachment fitting 24, and is fixed to the upper surface of the movable platen 32 by the pressure cylinders 1BL and 1BR. Further, in Fig. 6, for the sake of clarity, the electric motors constituting the oil house drives 100BL and 100BR, the two-way oil house pump, the position sensor, the flush valve, the check valve, the safety valve, and the control device are shown in pain. However, the hydraulic cylinders 1BL and 1BR are connected to an electric motor, a bidirectional hydraulic pump, a position sensor, a flush valve, an inspection valve, a safety valve, and a control device in a configuration as shown in Fig. 2 or Fig. 5. And the 'hydraulic drive 1 is exposed, 1GGBR does not need to connect the head side oil chamber 1BU, the line of the tank and the tank, and the liquid filling. This is because the cross-sectional product is larger than the oil-receiving device 2 in the head-side oil chamber of the rod-side oil chambers 1BLc and 1BRc. Self-weight pressure. That is, the pressure of the head side oil chambers 1BLb, 1BRb is not smaller than the pressure of the tank when the injection device 2 is moved up and down. Further, the injection device 20 emits the molten resin fed to the nozzle unit 23 to a cavity space (not shown) in the mold device 6G, and emits the device 2. The screw shaft is axially moved toward the nozzle portion 23 by an injection motor (not shown), and the molten resin is ejected from the nozzle portion 23 into the cavity space.

The /, 60 is composed of a fixed mold 6〇F attached to the fixed platen 31 and a movable mold 60M of the dynamic pressure Jar q η and J 2 . The cavity space is formed in the mold unit 60 by bringing the actuator into contact with the 6F. ' 17 201228800 The mold clamping device 30 performs a mold opening and closing operation and a mold clamping operation. Specifically, the mold clamping device 30 moves the movable platen 32 so as to be close to the fixed platen 31, and causes the movable mold 60 to come into contact with the fixed mold 60F. Further, the mold clamping device 3 moves the movable platen 32 away from the fixed platen 31 to separate the fixed mold 6F from the movable mold 60M. In the present embodiment, the two hydraulic actuators 100CL and 100CR which function as the hydraulic actuator of the present invention hold the movable platen 32 as the driven portion W on the fixed platen 31 and move it up and down. The hydraulic cylinder 1CL of the hydraulic actuator 100CL has a head side oil chamber 1CLb and a rod side oil chamber 1CLc which are divided by the piston 1CLa and the cylinder inner wall. Further, the hydraulic pump icr of the hydraulic actuator 100CR has a head side oil chamber 1CRb and a rod side oil chamber 1CRC which are divided by the piston 1CRa and the cylinder inner wall. The fixed platen 31 is fixed to the rods 4CL, 4CR which extend upward from the piston 1 CLa and the piston 1 CRa, respectively. The hydraulic cylinders 1CL, 1CR are fixed to the end plate 33. Further, in Fig. 6, the electric motor, the bidirectional hydraulic pump, the position sensor, the flush valve, the check valve, the safety valve, and the control device constituting the hydraulic actuators 100CL and 100CR are omitted for the sake of clarity. However, the hydraulic cylinders 1CL and 1CR are connected to an electric motor, a bidirectional hydraulic pump, a position sensor, a flush valve, an inspection valve, a safety valve, and a control device in a configuration as shown in Fig. 2 or Fig. 5. Further, the hydraulic actuators 100CL and 1〇〇CR do not need to connect the head side oil chambers lCLb, lCRb and the tank piping, and the liquid filling valve. This is because of the section

S 18 201228800 The product is larger than the rod side oil. The oil is subjected to the movable head side oil chamber 1CLb and the lion's 32 upper and lower slabs 32. That is, it is because of the pressure when the movable platen is moved up and down. The pressure of the ' / Lb, ICRb is not less than that of the can locker 30, and the 桓 M M M M 桓 桓 桓 桓 桓 桓 桓 桓 桓 桓 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 The locking force, which further presses the movable mold 60M to the fixed clamping mechanism 40, mainly includes the intermediate plate 43. The crucible 41, the hydraulic actuator 42 and the gear-in-force 41 are rods projecting downward from the fixed platen 3 & m, and in the present embodiment, the fixed platen 31 corresponding to a "center" of the die device 6 is used. The points on the bottom surface are arranged at a 90-degree interval on the circumference of the circle of the circle of the heart. The hydraulic actuator 42 is mounted on the end plate to be fixed to the _32 6, ' The hydraulic actuator 42 is a hydraulic mechanism that generates a clamping force as shown in Fig. 6 ('Picture 丨v has a piston 42a and an inner wall of the cylinder which is divided into a lower oil chamber 42b and an upper side. . . . 4Zc additionally, oil The pressure-driven benefit 42 system uses the Pascal principle to generate the mechanism. Therefore, the figure τ is clearly shown, omitting the figure 谣+, and constituting the component. The other fingerboard 43 of the reading heart pressure (four)^ is used for the oil β The clamping force generated by the actuator is transmitted to the assembly of the center rod 41. Specifically, 〇, ^^3〆, selectively filling the upper surface of the piston 42a of the hydraulic actuator 42 and the respective four center rods 41 19 201228800 The upper part of the space between the bottom surfaces of the lower end.... (c) Top view of the baffle 43' In the embodiment, the baffle 43 has four shim portions 43a to 43d that receive the bottom surfaces of the lower end portions of the four center rods 41a to 41d. In addition, the one-dot chain line in Fig. 6(C) indicates four crucibles. The upper end portions of the lower end portions of the four center rods 41a to 41d are respectively received by the sheet portions 仏 to 43d. Further, the shutter 43 is rotatably supported on the upper surface of the piston 42a around the center of rotation 43e, for example, which is not shown. The driving portion is rotationally driven. For example, in the mold opening state shown in Fig. 6(A), the shutter 43 is rotationally driven to the position indicated by the broken line in Fig. 6(C), so as to avoid the slap portion 仏~43d. I. The middle portions of the cups 41a to 41d are in contact with each other. At this time, the center rods 41a to 41d respectively penetrate the lower side of the piston 42a through the lower jaw portion of each of the four holes 42d provided in the piston 42a. On the other hand, in the mode-locked state shown in Fig. 6(b), the shutter 43 is rotationally driven to the position shown by the solid line of Fig. 6 so that the respective spacer portions 43a to 43d are respectively connected to the center rod. 41a to 41d are respectively in contact with the lower end portions. At this time, if the mold clamping mechanism 4 is operated, the center rods 41a to 41d are respectively restrained by the shutters 43 As a result of the rise of the piston 42a, the force of pressing the end plate 33 downward, that is, the force (clamping force) for pulling the movable platen 32 downward is generated. In the mold clamping state shown in Fig. 6(B), The injection device 2 射 ejects the molten resin fed to the nozzle portion 23 into the cavity space in the mold device 6. Thereafter, the refining resin in the cavity space is cooled and hard after a predetermined time period.

S 20 201228800 * After the "locking device 30", the movable platen 32 is moved away from the fixed platen 31 by the two hydraulic actuators 100CL, 100R, and the fixed mold 60F and the movable mold 60M are separated. According to the above configuration, the hydraulic actuators 100BL and 100BR mounted on the injection molding machine 200 can cause the injection device 20 to move up and down more efficiently without causing excessive pressure loss. Further, the hydraulic actuators i〇〇CL and 100CR mounted on the injection molding machine 200 can cause the movable platen 32 to move up and down more efficiently without excessive pressure loss. Further, the 'hydraulic actuators 1〇〇BL, l〇〇BR, l〇〇CL, 1〇〇CR are subjected to the weight of the injection device 2〇 or the movable platen 32 by the oil in the head side oil chambers lBLb, lBRb, 1CLb, 1CRb. The pressure 'Ran' is not limited to this invention. The hydraulic actuators 100BL, 10B, 100CL, and 100CR may be configured to withstand the weight of the injection device 2A or the movable platen 32 of the oil in the rod side oil chambers ULc, 1BRc, 1CLc, and 1CRc. The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described above, and various modifications and substitutions may be made to the above-described embodiments without departing from the scope of the invention.

1A is arranged as a rod 4, 4A. For example, in the above embodiment, the hydraulic cylinder is moved up and down so as to be driven in the wrong direction so as to be driven in the vertical direction, but the rod 4 can also be arranged. 4A extends in the oblique direction, and W moves linearly in the oblique direction. 21 201228800 [Simplified illustration] A schematic diagram of the structure of the oil generator. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a configuration of the present invention. FIG. 2 is a schematic view showing the present invention. Fig. 3 is a view showing the operation of the hydraulic actuator when the driven portion is lowered. Fig. 4 is a view showing the operation of the hydraulic actuator when the driven portion is raised. Fig. 5 is a view showing the hydraulic driving configuration of another embodiment of the present invention. The action of the figure. The junction driver of the apparatus Fig. 6 is a view showing a configuration example of an oil discharge molding machine according to an embodiment of the present invention. [Main component symbol description] 1, 1A, 1BL, 1BR, 1CL, 1CR: hydraulic cylinder; la, lAa, lBLa, IBRa, lCLa, lCRa: piston; lb, lAb, lBLb, IBRb, lCLb, lCRb: head side Oil chamber. lc, lAc, lBLc, IBRc, lCLc, lCRc: rod side oil chamber. 2: electric motor; 3: hydraulic pump; 4, 4A · rod; 5: position sensor; 6: flow control valve; 7: control device; 8: back pressure valve; 9: check valve; 1 〇: bidirectional hydraulic pump; 11: flush valve; 22 201228800 12L, 12R: check valve; 14: control device; 20: injection device; Injection cylinder; 2 4: mounting fittings; 31: fixed pressure plate; 3 3: end plate; 40: clamping mechanism; 42: hydraulic drive; 42b: upper oil chamber; 43: baffle; 4 3 e: rotating center; 60M: moving mold; 50, 100, 100A, 100BL, driver; 200: injection molding machine; W: driven part. 13L, 13R: safety valve; 1 5 : filling valve; 21: hopper; 23: nozzle part; 30: clamping device; 32: movable platen; 34: rod; 41, 41 a~41 d: center rod; 42a : piston; 42c: lower oil chamber; 43a to 44d: gasket portion; 60: mold device; 60F: fixed mold; 100BR, 100CL, 100CR: oil pressure T, ΤΙ, T2: tank;

Claims (1)

201228800 VII. Patent application scope: 1. An injection molding machine comprising a hydraulic actuator capable of moving a driven portion more efficiently up and down, characterized in that it comprises: a single rod cylinder having a rod side oil chamber divided by a piston And a head side oil chamber, wherein the oil in the rod side oil chamber or the head side oil chamber receives at least a portion of the self-weight pressure of the driven portion; the bidirectional hydraulic pump, wherein one of the ports and the single rod The rod side oil of the cylinder is in communication, the other port is in communication with the head side oil chamber of the single rod cylinder; and the motor 'drives the two-way hydraulic pump, the motor drives the two-way hydraulic pump to resist The self-heavy force of the driven portion reduces a portion of the rod side or the outflow pressure of the oil in the head side oil chamber. 2. The injection molding machine according to claim 1, wherein the motor drives the two-way hydraulic pump to control a flow rate of oil flowing out from the rod side oil chamber or the head side oil chamber. 3. The injection molding machine according to claim 1 or 2, further comprising a liquid filling valve or a pilot type check valve for replenishing the oil to the head side oil chamber. The actuator 'which moves the driven portion up and down, and is characterized in that: a single rod red 'having a rod side oil chamber and a head side oil chamber divided by a piston to the s pole side/to or the head side oil chamber The oil is subjected to at least a portion of the self-weight pressure of the driven portion; 24 201228800 a bi-directional hydraulic pump having a port in communication with the rod-side oil chamber of the single-rod rainbow, and the other port and the single rod a head side oil chamber of the cylinder is in communication; a motor driving the two-way hydraulic pump, the motor driving the two-way hydraulic pump 'to resist at least a portion of the rod side of the self-weight pressure of the driven portion The outflow pressure of the oil in the oil chamber or the head side oil chamber.