JP4823506B2 - Measuring device for liquid resin injection molding equipment - Google Patents

Description

  The present invention relates to an injection molding apparatus that molds using a liquid resin, and more particularly to a measuring apparatus for a plurality of liquid resins.

Liquid resin injection molding equipment measures and mixes a plurality of different types of liquid resins (generally two liquids of a main agent and a curing agent) that are liquid at room temperature, and injects them into a mold that has been clamped for injection molding. This is a molding apparatus. There is a great merit that energy for plasticizing the liquid resin is not required, and it is widely used for molding silicone rubber, for example.
Japanese Patent Laid-Open No. 6-63992

  The measurement of a plurality of liquid resins is generally performed by injecting a liquid resin into a measuring cylinder. In the conventional apparatus, the liquid resin is sucked into the cylinder by moving the measuring piston in the measuring cylinder. However, it has been found that a plurality of liquid resins to be weighed and mixed have different viscosities and cannot be accurately metered by simply sucking them with a metering piston.

  Accordingly, an object of the present invention is to provide a metering device capable of accurately metering a plurality of different liquid resins to be mixed in a liquid resin injection molding device.

The present invention is based on the viewpoint that accurate measurement can be performed by moving the measuring piston by pumping the liquid resin into the measuring piston, instead of sucking the liquid resin into the measuring cylinder by the measuring piston. It is.
The metering device of the present invention comprises a metering cylinder provided for each of a plurality of liquid resins to be mixed, the axis of which is oriented vertically; a metering piston slidably fitted in each metering cylinder; an opening at the bottom of each metering cylinder A metering channel for supplying liquid resin; a liquid resin pump for pumping liquid resin to each metering cylinder through this metering channel and raising each metering piston; and each metering piston when each metering piston is raised And a discharge pressure means for discharging the liquid resin from the measurement cylinder by simultaneously applying a downward force to the measurement pistons when discharging the liquid resin in the measurement cylinder . This positioning plate can be constituted by a single hydraulic injection cylinder device and a single positioning plate that is moved up and down by the single hydraulic injection cylinder device. It is characterized by simultaneous action on a plurality of metering pistons when the discharging liquid resin within the metering cylinder.

The rising position of each metering piston can be controlled by a sensor that detects the position of each metering piston.

  The mixing mode of the liquid resin discharged from each metering cylinder is not limited. For example, each metering flow channel communicating with the bottom of each metering cylinder is connected to each switching valve. These switching valves are used for switching each metering flow path to either a state connected to each liquid resin tank or a state connected to a single mixing nozzle. If these switching valves are composed of rotary valves, all the switching valves can be easily interlocked.

  According to the metering device of the present invention, it is possible to accurately meter a plurality of different liquid resins to be mixed in the liquid resin injection molding device.

  1 and 2 show an entire embodiment in which a liquid resin injection molding apparatus according to the present invention is applied to a quadruple mold clamping apparatus. On the lower base 11, a plurality of (four at the four corners) vertical support columns 12 independent for each of the four clamping devices arranged in a row, and the vertical support columns 12 for each clamping device are made independent. A fixed horizontal top beam 13 is provided. Each top beam 13 is provided with a resin injection port 20 (FIG. 4), and an injection molding upper die 14 is fixed to the lower surface of the top beam 13, and the lower base 11 corresponds to each upper die 14. The lower mold 15 for injection molding is supported so as to be movable up and down. Each lower mold 15 can be moved up and down independently by a dedicated clamping cylinder device 16. The resin injection port 20 communicates with an injection molding space formed by the upper mold 14 and the lower mold 15.

  In the above-described four-type mold clamping apparatus, each lower mold 15 can be moved up and down independently by the mold clamping cylinder apparatus 16 to perform mold clamping with the corresponding upper mold 14, and the mold clamping is completed. The liquid resin can be injected independently through the resin injection port 20. Reference numeral 17 in FIG. 2 is a lower mold take-out cylinder device for taking out the lower mold 15 in the lowered state forward (leftward in FIG. 2). The lower die 15 is lowered after the liquid resin molding is completed, and is pushed forward by the lower die take-out cylinder device 17. From the extruded lower mold 15, a molded product is taken out by an ejector device 18 (shown in the left mold clamping device in FIG. 1). The structure of each mold clamping device is well known, and further detailed description is omitted. In this embodiment, the top beam 13 (resin injection port 20, upper mold 14, lower mold 15) is independent for each mold clamping device, and the upper mold 14 and the lower mold 15 are respectively connected via the resin injection port 20. The liquid resin can be injected. Therefore, the four upper molds 14 and the lower mold 15 that make a pair do not need to be the same mold.

  A pair of parallel guide rails (linear motion guides) 21 are fixed on the four top beams 13 in common to the four mold clamping devices. On the guide rails 21, FIGS. A liquid resin metering injection mechanism 30 showing the overall structure is supported so as to be able to run. One of the pair of guide rails 21 is provided with a rack 21a (FIG. 4) facing the alignment direction of the four mold clamping devices. On the traveling base 31 of the liquid resin metering injection mechanism 30, the rack 21a is connected to the rack 21a. A meshing pinion 21b and a servo motor 32 for driving the pinion 21b in the forward and reverse directions are provided.

  A vertical guide member 33 (FIG. 4) is erected and fixed on the traveling base 31, and an elevator 40 is supported on the vertical guide member 33 so as to be movable up and down. Specifically, the lifting platform 40 includes an upper horizontal plate 41 and a lower horizontal plate 42, and the upper horizontal plate 41 and the lower horizontal plate 42 are coupled by the left and right coupling rods 43. A vertical guide plate 44 is fixed below the lower horizontal plate 42, and a vertical linear guide is slidably guided on the vertical guide plate 44 by a pair of left and right vertical guide rails 34 provided on the vertical guide member 33. 45 is provided. On the traveling base 31, lower ends of a pair of left and right vertical lifting cylinder devices 35 (FIG. 3) are fixed, and an upper end portion of the piston rod 36 of the lifting cylinder device 35 is an upper horizontal plate of the lifting platform 40. 41 is fixed. Therefore, the lifting platform 40 can be moved up and down in the vertical direction by the lifting cylinder device 35 on the traveling base 31.

  A weighing injection unit 50 that measures and injects the liquid resin (injection into the resin injection port 20) is supported on the lifting platform 40. This metering injection unit 50 measures the A liquid (main agent) and the B liquid (curing agent), and injects and injects them into the resin injection port 20 (in the molding space formed by the upper mold 14 and the lower mold 15) while mixing after the measurement. Has function. In this embodiment, the mixing ratio of liquid A and liquid B is 1: 1.

  The metering injection unit 50 includes an intermediate switching valve block 60, an upper metering unit 70 and an injection pressure unit 80, and a lower mixed injection unit 90. The switching valve block 60 includes a state in which the A liquid and the B liquid are sent to the measuring unit 70 and is measured, and an injection state in which the injection pressure unit 80 sends the A liquid and the B liquid measured by the measuring unit 70 to the mixing and injection unit 90. A valve mechanism for switching between the two is provided.

  The A liquid and the B liquid are formed in the switching valve block 60 from the A liquid tank 61A and the B liquid tank 61B schematically shown in FIGS. 5 and 6, respectively, via the A liquid pressure feed pump 62A and the B liquid pressure feed pump 62B. To the liquid A supply path 63A and the liquid B supply path 63B. The A liquid supply path 63A and the B liquid supply path 63B are connected to the A liquid rotary valve (three-way valve) 64A and the B liquid rotary valve (three way valve) 64B. The A liquid rotary valve 64A and the B liquid The rotary valve 64B includes a state in which the A liquid supply path 63A and the B liquid supply path 63B are connected to the A liquid measurement flow path 65A and the B liquid measurement flow path 65B on the weighing unit 70 side, and the A liquid measurement flow path. The state in which 65A and the B liquid measurement flow path 65B are connected to the A liquid injection flow path 66A and the B liquid injection flow path 66B on the mixed injection portion 90 side are selected and created.

  The A liquid rotary valve 64A and the B liquid rotary valve 64B are rotationally driven in synchronization with each other, and synchronous gears 67A and 67B are integrally provided at the ends of the rotary gears 64A and 67B. , Meshed with the common drive gear 68. The common drive gear 68 is driven to rotate in the forward and reverse directions by an air actuator 69 (FIG. 8), and at one rotating end of the common drive gear 68, a rotary valve 64A for liquid A is passed through synchronous gears 67A and 67B. And the B liquid rotary valve 64B connect the A liquid supply path 63A and the B liquid supply path 63B to the A liquid measuring flow path 65A and the B liquid measuring flow path 65B (FIG. 6). At the rotation end, the A-liquid rotary valve 64A and the B-liquid rotary valve 64B are connected to the A-liquid metering channel 65A and the B-liquid metering channel 65B, respectively, and the A-liquid injection channel 66A and the B-liquid injection channel 66B. (FIG. 7).

  The measuring section 70 has a liquid A cylinder 71A and a liquid B cylinder 71B with the axis line oriented in the vertical direction. The liquid A measuring cylinder 71A and the liquid B cylinder 71B are respectively provided with liquid A measuring liquid. The flow path 65A and the B liquid measurement flow path 65B are open. The A liquid piston 72A and the B liquid piston 72B are slidably fitted in the A liquid cylinder 71A and the B liquid cylinder 71B. The A liquid piston 72A and the B liquid piston 72B are raised by the pressure of the liquid pumped by the A liquid pump 62A and the B liquid pump 62B into the A liquid cylinder 71A and the B liquid cylinder 71B. In this embodiment, since the mixing ratio of the A liquid and the B liquid is 1: 1 as described above, the A liquid cylinder 71A (A liquid piston 72A) and the B liquid cylinder 71B (B liquid piston 72B) are the same. Size. When the mixing ratio is different, the A liquid cylinder 71A (A liquid piston 72A) and the B liquid are so arranged that the A liquid piston 72A and the B liquid piston 72B rise by the same distance according to the mixing ratio. The size of the cylinder for cylinder 71B (the piston for liquid B 72B) can be varied.

  As shown in FIGS. 3 and 4, the injection pressure unit 80 above the measuring unit 70 includes a positioning plate 81 supported by the right and left coupling rods 43 of the lifting platform 40 so as to be movable up and down. The positioning plate 81 is common to the A liquid piston 72A and the B liquid piston 72B, and is coupled to the extension rod 83 of the hydraulic injection cylinder device 82 fixed on the upper horizontal plate 41 of the lifting platform 40. The injection cylinder device 82 moves up and down. The positioning plate 81 is not coupled to the A liquid piston 72A and the B liquid piston 72B. FIG. 7 schematically shows the positional relationship (not coupled) between the positioning plate 81 and the pistons 72A and 72B. That is, the positioning plate 81 accurately measures both liquids by regulating the rising ends of the A liquid piston 72A and the B liquid piston 72B when measuring the A liquid and the B liquid, and conversely, the A liquid cylinder 71A. And the B liquid cylinder 71B, the force of the hydraulic injection cylinder device 82 is transmitted to the A liquid piston 72A and the B liquid piston 72B via the extension rod 83.

  As shown in FIG. 4, a movable portion 85 of a linear scale 84 is coupled to the positioning plate 81, and a fixing portion 86 of the linear scale 84 is fixed on the lifting platform 40. The position of the positioning plate 81 can be set by the linear scale 84. That is, the hydraulic injection cylinder device 82 raises the positioning plate 81 to the measuring position set by the linear scale 84.

  The mixing injection unit 90 located in the switching valve block 60 includes a mixing nozzle 93, a static mixer 94, and an opening / closing valve 96 in that order from above. The mixing nozzle 93 has inlet passages 91A and 91B communicating with the liquid A injection passage 66A and the liquid B injection passage 66B, and a single outlet passage 92 communicating with the static mixer 94. .

  The static mixer 94 is a well-known (commercially available) housing a large number of flow dividing elements 94Y in the outer casing 94X, and has no moving parts. The static mixer 94 is detachably provided on the lower surface of the switching valve block 60 (mixing nozzle 93). FIG. 5 shows the attachment / detachment structure. An outer circular flange 94X1 is formed at the upper end portion of the outer casing 94X, and a fixing plate 95X and a detachable plate 95Y for supporting the outer circular flange 94X1 are provided on the lower surface of the switching valve block 60. . The fixed plate 95X and the detachable plate 95Y have butt edge portions 95X2 and 95Y2 corresponding to the diameter portion of the outer casing 94X (outer circular flange 94X1). The butt edge portions 95X2 and 95Y2 are connected to the outer circular flange 94X1. Corresponding stepped semicircular recesses 95X3 and 95Y3 are formed.

  The fixed plate 95X and the detachable plate 95Y can be attached to and detached from the lower surface of the switching valve block 60 by at least the detachable bolt 95Y4. By removing the detachable plate 95Y, the static mixer 94 is removed from the lower surface of the switching valve block 60. Can be removed. In the static mixer 94, it is indispensable to regularly clean the internal flow path dividing element 94Y (removing the admixture of the liquid A and liquid B). By making the structure easy to attach and detach, the cleaning workability of the static mixer 94 can be improved.

  Further, the stepped semicircular recesses 95X3 and 95Y3 of the fixing plate 95X and the detachable plate 95Y accurately correspond to the shape of the outer circular flange 94X1 of the outer casing 94X. 94 can be accurately positioned and centered. The stepped semicircular recesses 95X3 and 95Y3 do not need to be exactly a plane semicircle, but should be as large as possible below the plane semicircle so that the static mixer 94 can be attached and detached and securely supported. .

  The open / close valve 96 located below the static mixer 94 finally injects the liquid mixture of the liquid A and the liquid B mixed by the static mixer 94 into the resin injection port 20. FIG. 10 shows the details. The opening / closing valve 96 is inserted into a main housing 961 fixed to the lower end portion of the outer casing 94X of the static mixer 94, a diversion block 962 inserted and fixed into the upper portion of the main housing 961, and a lower portion. A merging nozzle block 963, a lower housing 964 for fixing the merging nozzle block 963 to the main housing 961, and a needle valve 965 slidably inserted in the center of the main housing 961 are provided.

  The diversion block 962 includes a shaft inlet hole 962a that communicates with the outlet hole at the lower end of the static mixer 94 (outer casing 94X), and a plurality of peripheral branch channels (communication channels) that branch from the shaft inlet hole 962a. 962b, and the main housing 961 has a branch channel (communication channel) 961a communicating with these peripheral branch channels (communication channels) 962b on the peripheral edge removed from the shaft portion. The merging nozzle block 963 includes an inverted conical channel 963a and a shaft portion outlet hole 963b that reconnects the plurality of branch channels 961a, and a central portion of the inverted conical channel 963a and the shaft portion outlet hole 963b. The needle valve 965 is located in the position. The outer periphery of the lower end portion of the merging nozzle block 963 constitutes a fitting portion 963 c that fits into the resin injection port 20. The channel from the shaft inlet hole 962a to the surrounding branch channel (communication channel) 962b, the branch channel (connection channel) 961a, the inverted conical channel 963a and the shaft outlet hole 963b has a channel area. It is a throttle channel that gradually throttles. For example, the cross-sectional area of the shaft portion outlet hole 963b can be about 50% to 70% of the cross-sectional area of the shaft portion inlet hole 962a.

  The main housing 961 has a shaft hole 961b in the shaft portion thereof, and a needle valve 965 is slidably and fluid-tightly fitted in a lower portion of the shaft hole 961b, and a closing portion 962c of the flow dividing block 962 is fitted in an upper portion thereof. waiting. A pressure chamber 961c is formed in the shaft hole 961b between the closing portion 962c and the upper end portion of the needle valve 965, and a hydraulic pressure introduction port 961d is opened in the pressure chamber 961c. The inverted conical channel 963a, the shaft outlet hole 963b, and the needle valve 965 have a rotationally symmetric shape (circular cross section) around the axis.

  In the above open / close valve 96, the liquid pressure is applied to the pressure chamber 961c from the hydraulic inlet 961d, whereby the needle portion 965a at the tip of the needle valve 965 closes the shaft outlet hole 963b, while the liquid pressure to the pressure chamber 961c , The needle valve 965 can be retracted and the shaft outlet hole 963b can be opened by the liquid pressure exerted on the inverted conical channel 963a. Further, since the liquid mixture of the liquid A and the liquid B contacts only the needle valve 965 located in the merging nozzle block 963, a stable operation can be ensured for a long time.

  The overall operation of the apparatus having the above configuration will be described as follows. Molding mold (upper mold 14 and lower mold 15) in which mold clamping has been completed by mold clamping cylinder device 16 by means of servo motor 32, rack 21a, and pinion 21b. Move on top beam 13 above. In addition, the A actuator rotary valve 64A and the B solution rotary valve 64B are brought into the measurement state of FIG. Prior to setting the weighing state, the height position of the positioning plate 81 is set by the linear scale 84, and the positioning plate 81 is moved to the set height position by the hydraulic injection cylinder device 82. In this state, the A liquid piston 72A and the B liquid piston 72B are positioned at the lower end by their own weight, and the effective volumes of the A liquid cylinder 71A and the B liquid cylinder 71B are substantially zero. In addition, it is assumed that the A liquid and the B liquid or the mixed liquid thereof in the previous process remain in the flow paths in the switching valve block 60 and the mixed injection unit 90, respectively.

  In this state, when the A liquid pressure pump 62A and the B liquid pressure pump 62B are driven, the A liquid in the A liquid tank 61A and the B liquid in the B liquid tank 61B are converted into the A liquid supply path 63A and the B liquid supply path 63B, The liquid A is introduced into the A liquid cylinder 71A and the B liquid cylinder 71B via the A liquid rotary valve 64A and the B liquid rotary valve 64B, and the A liquid measuring channel 65A and the B liquid measuring channel 65B. When it is detected that the A liquid piston 72A and the B liquid piston 72B have risen due to the introduced liquid pressure and have reached a predetermined raised position by a proximity switch (not shown), the A liquid pressure feed pump 62A The B hydraulic pump 62B stops. At this time, the liquid A piston 72 </ b> A and the liquid B piston 72 </ b> B are in contact with the positioning plate 81. This completes the weighing operation.

  When the metering operation is completed, the A actuator rotary valve 64A and the B liquid rotary valve 64B are brought into the injection state of FIG. That is, the A liquid measuring channel 65A and the B liquid measuring channel 65B are communicated with the A liquid injection channel 66A and the B liquid injection channel 66B. By this time, the lifting / lowering table 40 is lowered by the lifting / lowering cylinder device 35, and the fitting portion 963 c at the lower end portion of the mixing / injecting portion 90 of the metering injection unit 50 is placed on the upper die 14 and the lower die 15 that have been clamped. The resin injection port 20 is fitted. Further, liquid pressure is applied to the hydraulic pressure inlet 961d (pressure chamber 961c) of the opening / closing valve 96, and the shaft portion outlet hole 963b is closed by the needle portion 965a.

  In this state, when the positioning plate 81 is lowered by the hydraulic injection cylinder device 82, the liquid A piston 72A and the liquid B piston 72B are pushed down and the liquid A and liquid B cylinders in the liquid A cylinder 71A are lowered. The B liquid in 71 B reaches the static mixer 94 via the mixing nozzle 93. The liquid A and liquid B that merge at the outlet path 92 of the mixing nozzle 93 are statically mixed as they pass through the static mixer 94. The fluid pressure (needle pressing hydraulic pressure) applied to the hydraulic pressure inlet 961d of the opening / closing valve 96 is relieved simultaneously with the lowering of the positioning plate 81 by the hydraulic injection cylinder device 82. Then, the needle valve 965 is retracted by the pressure of the liquid mixture of the liquid A and the liquid B mixed by the static mixer 94, and the liquid mixture is injected into the resin injection port 20 from the shaft portion outlet hole 963b. The injected mixed liquid is injected into the molding space of the upper mold 14 and the lower mold 15 clamped by the mold clamping cylinder device 16. After the injection is completed, the upper mold 14 and the lower mold 15 are heated to a predetermined temperature for a predetermined time according to a conventional method, and a liquid resin is molded.

  In the above embodiment, the liquid resin to be mixed is two types, the A liquid cylinder 71A and the B liquid cylinder 71B are shown as measuring cylinders, and the A liquid piston 72A and the B liquid piston 72B are shown as measuring pistons. When there are three or more types of liquid resin to be mixed, the number of measuring cylinders, measuring pistons, and rotary valves 64A and 64B is increased according to the number of them, and these are mixed by the mixing nozzle 93 and then introduced into the static mixer 94. That's fine. The rotary valve as the switching valve has an advantage that it is easy to mechanically interlock all, but it is of course possible to use a switching valve other than the rotary valve. The configuration of the switching valve block 60 is an example, and any configuration may be used as long as it has a function of feeding a plurality of liquid resins to the metering unit 70, mixing the metered liquid resins, and injecting them to the mixing injection unit 90. Absent.

  In the above embodiment, the positioning plate 81, the hydraulic injection cylinder device 82, and the extension rod 83 constitute the injection pressure portion (discharge pressure means) 80, and the discharge pressure is simultaneously applied to the measuring pistons 72A and 72B with a simple configuration. Can act. However, what is important is that it is not in contact with the metering piston at the time of metering, and that the discharge pressure is simultaneously applied to a plurality of metering pistons at the time of metering. .

In the above embodiment, at the time of measurement, the positioning plate 81 is moved to a predetermined measurement position that regulates the maximum rising position of the measurement piston at a non-contact position with the measurement pistons 72A and 72B. Of course, it is changed according to the amount of resin. The linear scale 84 is used for this position control of the positioning plate 81, but position control means other than the linear scale can be used. The raising position of the measuring piston at the time of measurement is detected and controlled by a proximity switch (sensor). The ascending position may be determined.

It is a front view which shows embodiment which applied the liquid resin injection molding apparatus by this invention to the quadruple-type clamping apparatus. It is a right view of FIG. It is an enlarged front view of the liquid resin metering injection mechanism on the quadruple mold clamping apparatus of FIG. FIG. 4 is a left side view of FIG. 3. It is a perspective view which cut | disconnects and shows the measurement discharge part of the liquid resin measurement injection | emission mechanism of FIG. It is sectional drawing of the measurement state of the liquid resin measurement injection mechanism of FIG. It is sectional drawing of the measurement resin discharge state of the liquid resin measurement injection mechanism of FIG. It is sectional drawing which follows the flow path of the liquid resin metering injection mechanism of FIG. It is sectional drawing which shows the state which the injection nozzle of the liquid resin metering injection mechanism of FIG. 3 closed. It is sectional drawing of the same open state.

Explanation of symbols

11 Lower base 12 Vertical support column 13 Top beam 14 Upper die 15 Lower die 16 Clamping cylinder device 17 Lower die take-out cylinder device 18 Ejector device 20 Resin inlet 21 Guide rail 21a Rack 21b Pinion 30 Liquid resin metering injection mechanism 31 Traveling base Table 32 Servo motor 33 Vertical guide member 34 Vertical guide rail 35 Elevating cylinder device 36 Piston rod 40 Elevating table 41 Upper horizontal plate 42 Lower horizontal plate 43 Connecting rod 44 Vertical guide plate 45 Vertical linear guide 50 Metering injection unit 60 Switching valve block 61A A liquid tank 61B B liquid tank 62A A liquid pressure feed pump 62B B liquid pressure feed pump 63A A liquid supply path 63B B liquid supply path 64A A liquid rotary valve 64B B liquid rotary valve 65A A liquid metering path 65B B liquid Metering channel 66A Liquid injection flow path 66B B liquid injection flow path 67A 67B Synchronous gear 68 Common drive gear 69 Air actuator 70 Measuring section 71A A liquid cylinder 71B B liquid cylinder 72A A liquid piston 72B B liquid piston 80 Injection pressure section 81 Positioning plate 82 Hydraulic injection cylinder device 83 Extension rod 84 Linear scale 90 Mixing injection section 93 Mixing nozzle 94 Static mixer 94X Outer casing 94Y Flow dividing element 95X Fixed plate 95Y Removable plate 96 Open / close valve 961 Main housing 961a Branch flow (Communication channel)
961b Shaft hole 961c Pressure chamber 961d Hydraulic introduction port 962 Branch block 962a Inlet hole 962b Surrounding branch flow path (connection flow path)
962c Blocking portion 963 Merge nozzle block 963a Reverse conical channel 963b Shaft portion outlet hole 963c Fitting portion 964 Lower housing 965 Needle valve 965a Needle portion

Claims (4)

A measuring cylinder provided for each of a plurality of liquid resins to be mixed, the axis of which is oriented vertically;
Metering piston slidably fitted in each metering cylinder;
A metering channel for supplying the liquid resin, which opens to the bottom of each metering cylinder
A liquid resin pump for pumping liquid resin to each metering cylinder through this metering channel and raising each metering piston; and when each metering piston is lifted, it is not in contact with each metering piston and is in the metering cylinder. Discharge pressure means for discharging the liquid resin from the measuring cylinder by simultaneously applying a downward force to each measuring piston when discharging the liquid resin;
Have
The discharge pressure means includes a single hydraulic injection cylinder device and a single positioning plate that is moved up and down by the single hydraulic injection cylinder device. When the positioning plate discharges the liquid resin in the metering cylinder, a plurality of discharge pressure means are provided. A metering device for a liquid resin injection molding device, which acts simultaneously on the metering piston . 2. The metering device of a liquid resin injection molding apparatus according to claim 1 , wherein the rising position of each metering piston is controlled by a sensor that detects the position of each metering piston. 3. The metering device of the liquid resin injection molding apparatus according to claim 1 , wherein each metering flow path leading to the bottom of each metering cylinder is connected to a respective switching valve, and these switching valves are connected to each metering flow path. A measuring device of a liquid resin injection molding apparatus that switches between a state connected to each liquid resin tank and a state connected to a single mixing nozzle. 4. The measuring device for a liquid resin injection molding apparatus according to claim 3, wherein the switching valve is a rotary valve.

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