JP5295843B2 - Hydraulic device and injection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic device capable of easily relaxing the influence of a change in temperature on a pressure. <P>SOLUTION: A piston type accumulator 37 can store an operating liquid supplied to an injection cylinder 27 and a compressed gas for applying a pressure to the operating liquid. A gas type accumulator 39 can store operating liquids imposing a pressure on each other and a compressed gas, has a volume larger than that of the accumulator 37, and communicates to the accumulator 37 so that the gas can circulate. The hydraulic device 29 has a pump 45 capable of supplying the operating liquids to the accumulator 37, and a first cock 69 capable of permitting or inhibiting the inflow and outflow of the operating liquids in the accumulator. Further, the hydraulic device 29 has a flexible tube 115 spirally around the outer circumference of the accumulator 39 and capable of flowing a cooling medium. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a hydraulic device and an injection device driven by the hydraulic device. The injection apparatus is used for a molding machine such as a die casting machine or an injection molding machine.

  A hydraulic apparatus having an accumulator and a die casting machine using the hydraulic apparatus are known. Patent Document 1 discloses a technique for driving an injection device of a die casting machine with an accumulator. Further, it is disclosed that the pressure of the accumulator changes due to a change in the atmospheric temperature of the die casting machine, and the pressure change affects the die casting product. As a countermeasure, a technique is disclosed in which the pressure of the accumulator is kept constant by changing the ratio of the gas and the working fluid in the accumulator based on a temperature change or the like.

JP 58-55165 A

  In the technique of Patent Document 1, since the detected event (temperature change) is different from the control target (accumulator oil amount), the control is complicated and it is difficult to obtain the expected effect.

  An object of the present invention is to provide a hydraulic device and an injection device that can easily reduce the influence of temperature change on pressure.

  The hydraulic device according to the present invention includes a hydraulic cylinder device, a hydraulic fluid supplied to the hydraulic cylinder device, and a first accumulator capable of containing a compressed gas that applies pressure to the hydraulic fluid, and pressure between the hydraulic fluid and the hydraulic fluid. A second accumulator capable of containing working fluid and compressed gas, having a larger volume than the first accumulator, and communicating with the first accumulator so as to be able to circulate the gas; and the working fluid in the first accumulator , A pump capable of compressing the gas in the first accumulator and the second accumulator, a storage amount adjusting valve capable of allowing or prohibiting the inflow and outflow of the hydraulic fluid in the second accumulator, and the second accumulator And a flexible tube that can be spirally wound around the outer periphery of the tube and can flow the temperature adjusting medium.

  Preferably, a first control valve that allows the cooling medium as the temperature adjusting medium to flow into the tube when the ambient atmospheric temperature exceeds a predetermined first threshold, and the ambient atmospheric temperature is predetermined. At least one of the second control valves that allows the temperature rising medium as the temperature adjusting medium to flow into the tube when the temperature falls below the second threshold value.

  Preferably, the tube is formed of an elastic member, and is wound around the second accumulator in a state of being elastically deformed by tension.

  Preferably, the tube has a flat portion extending along the longitudinal direction of the tube by forming a cross-sectional shape orthogonal to the longitudinal direction of the tube in a semicircular shape, and the flat portion is It is wound so as to contact the outer peripheral surface of the second accumulator.

  Preferably, the second accumulator is formed in an elongated shape that is long in the vertical direction, and the tube is wound around the second accumulator with the vertical direction being the axial direction of the spiral, the upper side being the upstream side It has become.

  Preferably, the second accumulator is formed in an elongated shape, and the tube is wound around the second accumulator with the longitudinal direction of the second accumulator as the axial direction of the spiral, and a plurality of the tubes Are arranged in the longitudinal direction of the second accumulator and connected in parallel to each other with respect to the flow of the temperature control medium.

  Preferably, a supply pipe for supplying the temperature adjusting medium to the plurality of tubes, a discharge pipe for discharging the temperature adjusting medium of the plurality of tubes, and the supply pipe and the discharge pipe are connected. And a connecting member connected to a portion between the plurality of tubes of the second accumulator.

  An injection device according to the present invention is supplied to an injection sleeve communicating with a cavity, an injection plunger slidable in the injection sleeve, a hydraulic cylinder device capable of driving the injection plunger, and the hydraulic cylinder device A first accumulator capable of accommodating a working fluid and a compressed gas that applies pressure to the working fluid, and a working fluid and a compressed gas that exert pressure on each other can be accommodated, and have a volume larger than that of the first accumulator. A second accumulator which is large and communicated with the first accumulator so as to be able to circulate the gas; a pump capable of compressing the gas of the first accumulator and the second accumulator by supplying a working fluid to the first accumulator; A storage amount adjusting valve capable of permitting or prohibiting inflow and outflow of hydraulic fluid in the second accumulator; and the second accumulator It is wound around the outer circumference of the motor in a spiral shape, and has a flexible tube which can supply a temperature adjusting medium.

  According to the present invention, the influence of temperature change on pressure can be easily reduced.

Schematic which shows the structure of the die-casting machine which concerns on embodiment of this invention. The circuit diagram which shows schematic structure of the hydraulic apparatus in the die-casting machine of FIG. The figure which shows schematic structure of the cooling system of the hydraulic apparatus in the die-casting machine of FIG. The side view which shows the specific structure of the cooling system of the hydraulic apparatus in the mold clamping apparatus of FIG. The figure of the cooling system seen from the paper surface left side of FIG. The figure of the cooling system seen from the paper surface back side of FIG. The side view which shows the specific structure of the cooling system in the injection device of FIG. The figure of the cooling system seen from the paper surface left side of FIG. Sectional drawing in the IX-IX line arrow direction of FIG. Sectional drawing of the tube of the cooling system of FIGS.

<Die-cast machine configuration>
FIG. 1 is a schematic view showing a configuration of a die casting machine 1 according to an embodiment of the present invention.

  The die casting machine 1 includes a mold clamping device 3 for opening and closing a mold 501, an injection device 5 for injecting molten metal (molten metal) as a molding material into the mold 501, and a die cast product as a molded product. And an extrusion device 6 for extruding from the mold 501. The die casting machine 1 also includes a control device 28 that controls the operations of the mold clamping device 3, the injection device 5, and the extrusion device 6.

  The mold 501 includes a fixed mold 503 and a moving mold 505 that are arranged to face each other. The fixed mold 503 is fixedly held by the mold clamping device 3. As indicated by a two-dot chain line, the moving mold 505 is moved by the mold clamping device 3 in a direction facing the fixed mold 503 (mold opening / closing direction: right and left direction in FIG. 1). When the fixed mold 503 and the moving mold 505 are brought into contact (mold closing), a cavity Ca for forming a die-cast product is formed between the fixed mold 503 and the moving mold 505.

  The mold clamping device 3 is constituted by, for example, a toggle type mold clamping device. The mold clamping device 3 includes a base 7, a fixed die plate 9 that holds a fixed mold 503, a movable die plate 11 that holds a movable mold 505, and a toggle mechanism 13 that drives the movable die plate 11 in the mold opening / closing direction. And a clamping cylinder device 15 for driving the toggle mechanism 13.

  The fixed die plate 9 is fixed to the base 7. The movable die plate 11 is provided on the base 7 so as to be movable in the mold opening / closing direction. The fixed die plate 9 and the movable die plate 11 are arranged opposite to each other, and hold the fixed mold 503 and the movable mold 505 on the opposed surfaces. Then, when the movable die plate 11 moves in the mold opening / closing direction, the mold 501 is opened / closed.

  The toggle mechanism 13 has a plurality of links 19 that connect the movable die plate 11 and the link housing 17. The link housing 17 is fixed to the base 7. The toggle mechanism 13 moves the movable die plate 11 with respect to the link housing 17 in the mold opening / closing direction by expanding and contracting the plurality of links 19.

  The mold clamping cylinder device 15 is constituted by a hydraulic cylinder. The mold clamping cylinder device 15 includes a cylinder tube 16, a piston (not shown) that can slide in the cylinder tube 16, and a piston rod (not shown) fixed to the piston. The inside of the cylinder tube 16 is divided into two cylinder chambers by a piston. The cylinder tube 16 is fixed to the link housing 17, and the piston rod is fixed to a plurality of links 19. When hydraulic fluid (for example, oil) is selectively supplied to the two cylinder chambers in the cylinder tube 16, the piston slides in the cylinder tube 16 and eventually the toggle mechanism 13 is driven.

  A plurality of tie bars 21 fixed to the fixed die plate 9 and the link housing 17 are inserted into the movable die plate 11. When the mold clamping cylinder device 15 and the toggle mechanism 13 are continuously driven even after the mold is closed, the plurality of tie bars 21 extend, and a mold clamping force is generated.

  The injection device 5 includes a sleeve 23 that communicates with the cavity Ca, a plunger 25 that can slide in the sleeve 23, and an injection cylinder device 27 that can drive the plunger 25.

  For example, the sleeve 23 is inserted into the fixed die plate 9 and communicated with the cavity Ca. Molten metal is supplied into the sleeve 23 from a hot water supply port (not shown), and the plunger 25 advances (moves toward the cavity Ca) in the sleeve 23, whereby the molten metal is injected and filled into the cavity Ca.

  The control device 28 is constituted by a computer, for example, and has a CPU, a ROM, a RAM, an external storage device, an input device, and an output device (display device), although not particularly shown.

<Operation of the entire die casting machine>
Before the start of each molding cycle, the mold clamping device 3 is in the mold open state. That is, the movable die plate 11 is located at a mold opening position where the fixed mold 503 and the movable mold 505 are separated from each other.

  When the start condition of the molding cycle is satisfied, the control device 28 drives the movable die plate 11 in the mold closing direction by the mold clamping cylinder device 15 to perform mold closing. When the mold contact is made, the control device 28 further drives the mold clamping cylinder device 15 to extend the tie bar 21 and generate a mold clamping force.

  When the conditions for starting injection are satisfied, such as when mold clamping is completed, the control device 28 advances the plunger 25 by the injection cylinder device 27. Thereby, the molten metal in the sleeve 23 is injected and filled into the cavity Ca. After filling, the control device 28 applies pressure to the molten metal in the cavity Ca through the plunger 25 by the injection cylinder device 27, and maintains the molten metal pressure at a constant casting pressure. Thereafter, as time passes, the molten metal in the cavity Ca is cooled and solidified to form a die-cast product.

  When the molten metal is solidified, the control device 28 drives the movable die plate 11 in the mold opening direction by the mold clamping cylinder device 15 to perform mold opening. The control device 28 extrudes the die-cast product from the moving mold 505 by the extrusion device 6 in parallel with the mold opening or after the mold opening.

  The control device 28 automatically repeats the molding cycle from the start of mold closing to the extrusion of the die cast product. As can be understood from the above description, the mold clamping cylinder device 15 also serves as a mold opening / closing cylinder device.

<Configuration of hydraulic device in injection device>
FIG. 2 is a circuit diagram showing a schematic configuration of a hydraulic device 29 including an injection cylinder device 27 for driving the plunger 25.

  The injection cylinder device 27 includes a cylinder tube 31, a piston 33 that can slide in the cylinder tube 31, and a piston rod 35 that is fixed to the piston 33. The inside of the cylinder tube 31 is divided into two cylinder chambers (a rod side chamber 31r and a head side chamber 31h) by a piston 33. In the injection cylinder device 27, a cylinder tube 31 is fixedly provided with respect to the base 7, and a piston rod 35 is connected to the plunger 25 (see FIG. 1). When hydraulic fluid (for example, oil) is selectively supplied to the rod side chamber 31r and the head side chamber 31h, the piston 33 slides in the cylinder tube 31, and the plunger 25 is driven.

  The hydraulic pressure device 29 includes a piston type accumulator 37 for driving the injection cylinder device 27 and a gas type accumulator 39 for assisting the piston type accumulator 37.

  The piston accumulator 37 has a cylinder tube 41 and a piston 43 that can slide in the cylinder tube 41. The piston 43 partitions the inside of the cylinder tube 41 into a liquid chamber 41a and a gas chamber 41b. The liquid chamber 41a stores hydraulic fluid, and the gas chamber 41b stores gas (for example, nitrogen or air). By supplying the hydraulic fluid to the liquid chamber 41a, the piston 43 moves to the gas chamber 41b side, the gas in the gas chamber 41b is compressed, and the pressure accumulation in the piston accumulator 37 is performed. And the piston type accumulator 37 can send out the hydraulic fluid of the liquid chamber 41a by the pressure of the gas compressed in the gas chamber 41b. The liquid chamber 41a communicates with the head-side chamber 31h, and the piston accumulator 37 is used for the advancement of the plunger 25 (movement toward the cavity Ca).

  The gas accumulator 39 is composed of a cylinder tube. The cylinder tube is formed in a cylindrical shape, for example, and is arranged with the longitudinal direction as the vertical direction. Gas and hydraulic fluid are accommodated in the gas accumulator 39. There is no partition between the gas and the hydraulic fluid. In the gas accumulator 39, a relatively low density gas is stored on the upper side, and a relatively high density working fluid is stored on the lower side. The gas and the hydraulic fluid are in direct contact with each other and exert pressure on each other.

  The upper side of the gas type accumulator 39 communicates with the gas chamber 41b. Therefore, the gas accumulator 39 substantially expands the gas chamber 41b. As a result, in the piston-type accumulator 37, the amount of gas compressed with respect to the hydraulic fluid to be delivered is relatively increased, and the pressure drop associated with the hydraulic fluid delivery is reduced. The volume of the gas accumulator 39 that accommodates the gas is defined by the amount of hydraulic fluid that is accommodated in the gas accumulator 39.

  A relief valve (safety valve) 77 for releasing the gas to the atmosphere when the pressure of the gas in the accumulator exceeds a predetermined value is connected to the communicating portion between the gas chamber 41b and the upper side of the gas accumulator 39. Has been.

  The hydraulic device 29 further includes a pump 45 that can deliver hydraulic fluid and a tank 47 that can store hydraulic fluid. The hydraulic pressure device 29 has a hydraulic pressure circuit 49 for controlling the flow of hydraulic fluid among the injection cylinder device 27, the piston type accumulator 37, the gas type accumulator 39, the pump 45 and the tank 47.

  The pump 45 may be a reciprocating type that sends hydraulic fluid by a reciprocating movement of a plunger, or may be a rotary type that sends hydraulic fluid by rotating gears or vanes. The pump 45 is driven by a motor (electric motor) 51 controlled by the control device 28. For convenience of illustration, the tank 47 is illustrated at a plurality of locations in FIG. 2, but an appropriate size may be provided in an appropriate number.

  The hydraulic circuit 49 is configured to allow various operations. Specifically, it is as follows.

  The hydraulic circuit 49 is configured to allow pressure accumulation of the piston type accumulator 37 by the pump 45. Specifically, the hydraulic circuit 49 has a first flow path 53 that connects the pump 45 and the liquid chamber 41a. The first flow path 53 is provided with an appropriate control valve so that the flow of the hydraulic fluid from the pump 45 to the liquid chamber 41a can be allowed or prohibited. For example, the first flow path 53 is provided with a two-port two-position first switching valve 55 that can be switched between a position that allows the flow of hydraulic fluid and a position that prohibits the flow of hydraulic fluid. Yes. Further, in the first flow path 53, in order to prevent the back flow from the piston type accumulator 37 to the pump 45, the flow from the pump 45 to the piston type accumulator 37 is allowed and the reverse flow is prohibited. A check valve (check valve) 57 is provided.

  The hydraulic circuit 49 is configured such that the injection cylinder device 27 can be advanced by the piston type accumulator 37. Specifically, the hydraulic circuit 49 has a second flow path 59 that connects the liquid chamber 41a and the head side chamber 31h. The second flow path 59 allows the flow from the liquid chamber 41a to the head side chamber 31h and prohibits the reverse flow in order to prevent the back flow from the head side chamber 31h to the piston accumulator 37. A stop valve 61 is provided.

  The hydraulic circuit 49 is configured to allow the pump 45 to retract the injection cylinder device 27 and discharge the hydraulic fluid from the injection cylinder device 27. Specifically, the hydraulic circuit 49 is configured so that the rod side chamber 31r and the head side chamber 31h can be selectively connected to the pump 45 and the tank 47, respectively. For example, the hydraulic circuit 49 has a second switching valve 63 at a 4-port 3 position. At the first position P1, the second switching valve 63 connects the rod side chamber 31r and the tank 47, and connects the head side chamber 31h and the pump 45. As a result, the hydraulic fluid discharged from the rod side chamber 31r as the piston 33 moves forward can be discharged to the tank 47. The second switching valve 63 connects the rod side chamber 31r and the pump 45 at the second position P2 and connects the head side chamber 31h and the tank 47. Accordingly, the hydraulic fluid is supplied from the pump 45 to the rod side chamber 31r to retract the piston 33, and the hydraulic fluid discharged from the head side chamber 31h as the piston 33 is retracted can be discharged to the tank 47. Further, the second switching valve 63 blocks connection between the rod side chamber 31r and the head side chamber 31h, and the pump 45 and the tank 47 at the neutral position P0.

  In the hydraulic circuit 49, the pressure is accumulated in the piston accumulator 37 and the injection cylinder device 27 is retracted by the common pump 45, so that the first flow path 53 and the pump 45 extend to the second switching valve 63. The flow path is shared on the pump 45 side.

  An appropriate control valve is provided between the head side chamber 31h and the second switching valve 63 in order to allow or prohibit the flow from the head side chamber 31h (piston accumulator 37) to the second switching valve 63. Yes. For example, a pilot-type third check valve 65 is provided. The third check valve 65 is opened when the pilot pressure is introduced, and prohibits the flow from the head side chamber 31h to the second switching valve 63 when the pilot pressure is not introduced, and vice versa. Allow flow. The third check valve 65 prohibits the flow of hydraulic fluid from the head side chamber 31h to the second switching valve 63 when hydraulic fluid is supplied from the piston accumulator 37 to the head side chamber 31h to advance the piston 33. Further, when the piston 33 moves backward, the flow of hydraulic fluid from the head side chamber 31h to the second switching valve 63 is allowed.

  The hydraulic circuit 49 is configured to be able to adjust the amount of hydraulic fluid stored in the gas accumulator 39. In other words, the hydraulic circuit 49 is configured to be able to supply the hydraulic fluid to the gas accumulator 39 and to discharge the hydraulic fluid from the gas accumulator 39.

  Specifically, the hydraulic circuit 49 has a third flow path 67 that communicates between the pump 45 and the lower side of the gas accumulator 39 so that the pump 45 can supply hydraulic fluid to the gas accumulator 39. And a first cock 69 provided in the third flow path 67.

  The third flow path 67 is shared with the first flow path 53 on the pump 45 side in order to perform pressure accumulation of the piston type accumulator 37 and supply of hydraulic fluid to the gas type accumulator 39 by a common pump 45. Yes. Accordingly, the liquid chamber 41 a of the piston accumulator 37 and the lower side of the gas accumulator 39 are communicated with each other. However, since the first check valve 57 is provided on the piston accumulator 37 side of the first flow path 53 from the branch point with the third flow path 67, the gas accumulator is connected to the piston accumulator 37. The flow of hydraulic fluid to 39 is prohibited by the first check valve 57.

  The first cock 69 is provided in a portion of the third channel 67 that is not shared with the first channel 53. For example, the first cock 69 is manually operated to open and close the third flow path 67. When the pump 45 is driven with the first cock 69 open, the amount of hydraulic fluid stored in the gas accumulator 39 increases.

  In addition, the hydraulic circuit 49 includes a fourth flow path 71 that connects the lower side of the gas accumulator 39 and the tank 47 and a fourth flow so that the hydraulic fluid can be discharged from the gas accumulator 39 to the tank 47. And a second cock 73 provided in the path 71.

  The fourth channel 71 is shared by the third channel 67 and the gas accumulator 39 side. Specifically, the fourth flow path 71 is shared with the third flow path 67 including the arrangement range of the first cock 69. Accordingly, the fourth flow path 71 is also opened and closed by the first cock 69.

  The second cock 73 is manually operated, for example, and opens and closes the fourth flow path 71 on the tank 47 side (portion not shared with the third flow path 67). When the first cock 69 and the second cock 73 are opened, the hydraulic fluid in the gas accumulator 39 is discharged to the tank 47 by the gas pressure in the gas accumulator 39.

  In addition to this, the hydraulic circuit 49 includes a third switching valve 75 for discharging the working fluid of the piston type accumulator 37 to the tank 47. Note that the third switching valve 75 is opened when the piston type accumulator 37 is maintained, and is in the closed position over a plurality of molding cycles.

  The hydraulic device 29 has a cooling system 79 for cooling the gas accumulator 39. Details of the cooling system 79 will be described later.

<Operation of hydraulic device in injection device>
Before a plurality of molding cycles are started (before the die casting machine 1 is operated), the gas pressure in the gas chamber 41b and the gas accumulator 39 is adjusted. The adjustment can be performed including the adjustment of the amount of hydraulic fluid in the gas accumulator 39 using the first cock 69 and the second cock 73 described above. Note that after the plurality of molding cycles are started, the first cock 69 and the second cock 73 are basically kept closed over the plurality of molding cycles.

  The adjustment of the gas pressure before the start of a plurality of molding cycles is performed when the piston 43 of the piston accumulator 37 is moved to a predetermined upper limit position in each molding cycle and the pressure accumulation of the piston accumulator 37 is performed. It is performed so that the set pressure becomes. For example, in a state where the piston 43 is located at the upper limit position, gas is sealed and the amount of the working fluid in the gas accumulator 39 is adjusted until the detected pressure in the gas accumulator 39 reaches the set pressure.

  The upper limit position is a position where the piston 43 stops when the pressure accumulation of the piston type accumulator 37 is completed in each molding cycle, and may be set as appropriate. For example, the upper limit position may be a physical limit position where the piston 43 comes into contact with a stopper or the like, or may be a position appropriately set before reaching the physical limit position. The fact that the piston 43 has reached the upper limit position is detected by, for example, a sensor (not shown).

  Before the start of the molding cycle (strictly, it may be before the start of injection), the piston 33 of the injection cylinder device 27 is located at the backward limit. The backward limit may be a physical limit position or a position set as appropriate. Further, the piston 43 is located at the upper limit position, and the piston type accumulator 37 is in a state where pressure is accumulated. The second switching valve 63 is in the neutral position P0. Thereby, the discharge of the hydraulic fluid from the rod side chamber 31r is prohibited, and as a result, the forward movement of the piston 33 of the injection cylinder device 27 is prohibited. The first switching valve 55 is in the closed position. As a result, the supply of hydraulic fluid from the pump 45 to the piston accumulator 37 is prohibited.

  When the injection start condition is satisfied, the control device 28 switches the second switching valve 63 to the first position P1. Thereby, discharge | emission of the hydraulic fluid of the rod side chamber 31r is accept | permitted. The piston 33 moves forward by injection of hydraulic fluid from the piston accumulator 37 to the head side chamber 31h, and injection is performed.

  When the conditions for starting the backward movement of the plunger 25 are satisfied, for example, the molten metal solidifies, the control device 28 switches the second switching valve 63 to the second position P2, drives the pump 45, and pilots the third check valve 65. Introduce pressure. Thereby, the hydraulic fluid sent out from the pump 45 is supplied to the rod side chamber 31r, and the piston 33 of the injection cylinder device 27 moves backward. The hydraulic fluid discharged from the head side chamber 31 h as the piston 33 moves backward is discharged to the tank 47 via the third check valve 65. The flow from the head side chamber 31 h to the piston type accumulator 37 is prohibited by the second check valve 61. The second check valve 61 may be a check valve that opens with pilot pressure, and the hydraulic fluid discharged from the head side chamber 31h can be used for accumulating the piston accumulator 37.

  When it is detected by a sensor (not shown) that the piston 33 of the injection cylinder device 27 has reached the retreat limit, the control device 28 switches the second switching valve 63 to the neutral position P0 and supplies the third check valve 65 to the third check valve 65. The introduction of the pilot pressure is stopped, and the first switching valve 55 is switched to the open position. As a result, the hydraulic fluid delivered from the pump 45 is supplied to the piston accumulator 37 via the first switching valve 55, and the piston accumulator 37 is accumulated. The head side chamber 31h is prohibited from discharging the hydraulic fluid by the second switching valve 63, and is prohibited from expanding to the rod side chamber 31r side by prohibiting the discharge of the hydraulic fluid from the rod side chamber 31r. Yes. Therefore, the flow of hydraulic fluid from the pump 45 and the piston type accumulator 37 to the head side chamber 31h is prohibited.

  When the sensor (not shown) detects that the piston 43 of the piston type accumulator 37 has reached the upper limit position, the control device 28 switches the first switching valve 55 to the closed position and stops the pump 45. Thereby, it will be in the state before the injection start of the next molding cycle. At this time, the gas pressure in the gas chamber 41b and the gas accumulator 39 is set to a pressure set before a plurality of molding cycles.

<Configuration and operation of hydraulic device in mold clamping device>
The configuration of the hydraulic device 81 (FIG. 1) including the clamping cylinder device 15 in the mold clamping device 3 may be configured in the same manner as the hydraulic device 29 including the injection cylinder device 27 in the injection device 5, for example. Therefore, the circuit diagram of the hydraulic device 81 is not shown. The operation of the hydraulic device 81 in the mold closing operation may be performed in the same manner as the operation of the hydraulic device 29 in the injection operation, and the operation of the hydraulic device 81 in the mold opening operation is the liquid in the backward operation of the plunger 25. The operation may be performed in the same manner as the operation of the pressure device 29.

<Configuration of cooling system of hydraulic device>
FIG. 3 is a diagram showing a schematic configuration of the cooling system 83 of the hydraulic device 81 and the cooling system 79 of the hydraulic device 29.

  The hydraulic device 81 is configured similarly to the hydraulic device 29 as described above. Therefore, the hydraulic device 81 includes a piston accumulator 84 (see FIG. 4) and a gas accumulator 85 corresponding to the piston accumulator 37 and the gas accumulator 39 in the hydraulic device 29.

  The cooling system 83 has a cooling flow path 87 extending spirally on the outer periphery of the gas accumulator 85. A cooling medium flows through the cooling flow path 87. The cooling medium is, for example, water.

  The cooling flow path 87 is provided with, for example, a fourth switching valve 89 capable of opening and closing the cooling flow path 87 and a first pressure reducing valve 91 for reducing the outlet side pressure to a predetermined value on the upstream side. Further, the cooling flow path 87 is provided with a bypass flow path 93 that bypasses the fourth switching valve 89, and the bypass flow path 93 is provided with a third cock 95 that opens and closes the bypass flow path 93.

  The fourth switching valve 89 is constituted by an atmospheric temperature sensing valve that opens the cooling passage 87 when the ambient temperature exceeds a predetermined threshold. The atmospheric temperature sensing valve may be, for example, a mechanical type in which the valve is driven by a gas, liquid, or solid that expands or contracts due to a change in the atmospheric temperature, a sensor that detects the atmospheric temperature, and a sensor detection It may be an electric type having a drive unit that drives the valve according to the result. When the temperature of the atmosphere around the die casting machine 1 rises, the fourth switching valve 89 automatically opens and allows the flow of the cooling medium. Thereby, the gas type accumulator 85 is cooled, and the pressure fluctuation of the gas type accumulator 85 is suppressed. Note that the threshold value at which the fourth switching valve 89 opens may be appropriately set according to the specifications and environment of the die casting machine 1.

  The third cock 95 is manually opened and closed, for example, and is opened as necessary when the cooling medium needs to flow while the fourth switching valve 89 is not open.

  The hydraulic device 29 has a gas accumulator 40 in addition to the gas accumulator 39. The gas accumulator 40 is used when the molten metal filled in the cavity Ca is pressurized by the plunger 25. The hydraulic device 29 includes a piston accumulator communicated with the gas accumulator 40, a boosting cylinder device supplied with hydraulic fluid from the piston accumulator, and communicated with the injection cylinder device 27, and the like is not shown. The boost cylinder device may be configured integrally with the injection cylinder device 27 or may be configured separately from the injection cylinder device 27.

  Similar to the cooling system 83, the cooling system 79 has a cooling flow path 97 through which a cooling medium flows. The cooling flow path 97 has divided flow paths 97a and 97b that diverge and join each other in the middle. The divided flow path 97 a extends spirally on the outer periphery of the gas accumulator 39, and the divided flow path 97 b extends spirally on the outer periphery of the gas accumulator 40.

  Further, in the same manner as the fourth switching valve 89, the first pressure reducing valve 91, the bypass channel 93 and the third cock 95 are provided in the cooling channel 87, the fifth switching valve 99 is provided in the cooling channel 97. A second pressure reducing valve 101, a bypass flow path 103, and a fourth cock 105 are provided.

<Specific configuration of cooling system of hydraulic device in mold clamping device>
FIG. 4 is a side view showing a specific configuration of the cooling system 83 in the mold clamping device 3. FIG. 5 is a view of the cooling system 83 as viewed from the left side of FIG. FIG. 6 is a view of the cooling system 83 as seen from the back side of the sheet of FIG. However, in FIG. 6, only the lower part of the gas accumulator 85 is shown.

  The piston type accumulator 84 and the gas type accumulator 85 are arranged adjacent to each other. The gas-type accumulator 85 is longer than the piston-type accumulator 84, and protrudes upward from the piston-type accumulator 84 by being disposed on the same base as the piston-type accumulator 84.

  A communication pipe 106 (FIGS. 4 and 5) that connects a gas chamber (not shown) of the piston accumulator 84 and the gas accumulator 85 extends from the upper end of the piston accumulator 84 in the longitudinal direction (vertical direction) of the gas accumulator 85. And is connected to the upper end of the gas accumulator 85. The communication pipe 106 is made of, for example, a rigid body such as metal. The communication pipe 106 is fixed to the piston accumulator 84 and the gas accumulator 85 by a fixing member such as a screw.

  The cooling flow path 87 includes tubes 109A and 109B (FIGS. 4 and 6; hereinafter, A and B may be omitted) wound spirally around the gas accumulator 85, and a cooling medium for the tube 109. The supply pipe 107 (FIGS. 4 and 5) to be supplied and the discharge pipe 111 (FIGS. 5 and 6) through which the cooling medium is discharged from the tube 109 are configured.

  The tube 109 is made of rubber, for example, and has flexibility and elasticity. The tube 109 is spirally wound around the outer periphery of the gas accumulator 85 in a state in which tension is applied and elastically deformed in the longitudinal direction. Therefore, the tube 109 fastens the gas accumulator 85 by its restoring force, whereby the tube 109 is fixed in close contact with the gas accumulator 85. An adhesive or a double-sided tape may be disposed between the tube 109 and the gas accumulator 85.

  The tube 109A and the tube 109B are respectively arranged on one side (upper side) and the other side (lower side) of the gas accumulator 85 which is divided into two in the longitudinal direction (vertical direction). For example, the tube 109A and the tube 109B have the same length and are wound at the same pitch.

  The supply pipe 107 is made of a rigid body such as a metal, for example. The supply pipe 107 has a standing portion 107 c extending in the longitudinal direction (vertical direction) of the gas accumulator 85. The length (height) of the standing portion 107c is substantially equal to the length (height) of the gas accumulator 85. The standing portion 107c has a first supply port 107a to which the upper end of the tube 109A is connected and a second supply port 107b to which the upper end of the tube 109B is connected. The 1st supply port 107a is provided in the upper end of the standing part 107c, and the 2nd supply port 107b is provided in the intermediate position of the standing part 107c.

  The discharge pipe 111 is made of, for example, a rigid body such as metal. The discharge pipe 111 has a standing portion 111 c extending in the longitudinal direction (vertical direction) of the gas accumulator 85. The length (height) of the standing portion 111c is approximately half of the length (height) of the gas accumulator 85. The standing portion 111c has a first discharge port 111a to which the lower end of the tube 109A is connected, and a second discharge port 111b to which the lower end of the tube 109B is connected. The 1st discharge port 111a is provided in the upper end of the standing part 111c, and the 2nd discharge port 111b is provided in the downward side of the standing part 111c.

  As can be understood from the above description, the tubes 109A and 109B are connected in parallel to each other with respect to the flow of the cooling medium (with respect to the supply pipe 107 and the discharge pipe 111).

  The standing portions 107c and 111c are supported by being connected to the communication pipe 106 by a connecting member 113, for example. The connecting member 113 is composed of, for example, a plurality of pieces, and the two members are fixed to each tube by fixing the two members to each other with screws so that the two members sandwich and tighten each tube.

  The fourth switching valve 89 that opens and closes according to the atmospheric temperature is provided adjacent to the lower side portion of the piston type accumulator 84 and the gas type accumulator 85. The fourth switching valve 89 is provided in the supply pipe 107 at a position upstream from the standing portion 111c. The piston type accumulator 84 and the gas type accumulator 85 may be provided at appropriate positions such as in the vicinity of the mold clamping cylinder device 15.

  In the cooling system 83 having the above configuration, when the atmospheric temperature near the gas accumulator 85 exceeds a predetermined threshold value, the fourth switching valve 89 is opened and the flow of the cooling medium is allowed. The cooling medium flows from below to above in the standing portion 107c of the supply pipe 107, flows from above to below in the tube 109A and the tube 109B, and flows from above to below in the standing portion 111c of the discharge pipe 111. The cooling medium branches in the tube 109A and the tube 109B and flows in parallel.

<Specific configuration of cooling system of hydraulic device in injection device>
FIG. 7 is a side view showing a specific configuration of the cooling system 79 in the injection device 5. FIG. 8 is a view of the cooling system 79 as viewed from the left side of FIG. 9 is a cross-sectional view in the direction of arrows IX-IX in FIG.

  The gas accumulators 39 and 40 are arranged adjacent to each other. The gas accumulator 39 is longer than the gas accumulator 40, and the gas accumulator 39 is disposed on the same base as the gas accumulator 40, thereby projecting upward from the gas accumulator 40.

  The cooling flow path 97 includes tubes 115A, 115B, 115C and 115D (hereinafter, A to D may be omitted) spirally wound around the gas accumulators 39 and 40, and a cooling medium for the tubes 115. A supply pipe 117 to be supplied and a discharge pipe 119 (FIG. 7) through which the cooling medium is discharged from the tube 115 are configured.

  The configuration and attachment method of the tube 115 are the same as those of the tube 109 in the mold clamping device 3 except for its length. That is, the tube 115 is made of an elastic member, and is wound around the gas accumulators 39 and 40 in a state where tension is applied.

  The tubes 115 </ b> A and 115 </ b> B are respectively arranged on one side (upper side) and the other side (lower side) of the gas accumulator 39 which is divided into two in the longitudinal direction (vertical direction). The arrangement range of the tube 115B is slightly longer than the arrangement range of the tube 115A. The tubes 115C and 115D are arranged on one side (upper side) and the other side (lower side) of the longitudinal direction (vertical direction) of the gas accumulator 40, respectively. The boundary position between the arrangement range of the tube 115C and the arrangement range of the tube 115D is generally set to coincide with the boundary position between the arrangement range of the tube 115A and the arrangement range of the tube 115B. As a result, the arrangement range of the tube 115C is shorter than the arrangement range of the tube 115D. The tubes 115 </ b> A to 115 </ b> D are wound at substantially the same pitch, and have different lengths in proportion to the length of each arrangement range.

  The supply pipe 117 and the discharge pipe 119 are made of a rigid body such as metal, like the supply pipe 107 and the discharge pipe 111 in the mold clamping device 3. Similarly to the supply pipe 107, the supply pipe 117 is configured to supply a cooling medium to the upper end of the tube 115. Similarly to the discharge pipe 111, the discharge pipe 119 is configured such that the cooling medium is discharged from the lower end of the tube 115. Specifically, it is as follows.

  The supply pipe 117 has standing portions 117e and 117f that are branched from each other and extend in the longitudinal direction (vertical direction) of the gas accumulators 39 and 40. The lengths (heights) of the standing portions 117e and 117f are substantially equal to the lengths (heights) of the gas accumulators 39 and 40, respectively. The standing portion 117e has a first supply port 117a to which the upper end of the tube 115A is connected, and a second supply port 117b to which the upper end of the tube 115B is connected. The 1st supply port 117a is provided in the upper end of the standing part 117e, and the 2nd supply port 117b is provided in the middle of the standing part 117e. Similarly, the standing portion 117f has a third supply port 117c to which the upper end of the tube 115C is connected, and a fourth supply port 117d to which the upper end of the tube 115D is connected. The third supply port 117c is provided at the upper end of the standing portion 117f, and the fourth supply port 117d is provided in the middle of the standing portion 117f.

  The discharge pipe 119 has standing portions 119e and 119f that are branched from each other and extend in the longitudinal direction (vertical direction) of the gas accumulators 39 and 40. The length (height) of the standing portion 119e is shorter than that of the gas accumulator 39, and the length (height) of the standing portion 111f is shorter than that of the gas accumulator 40. The standing portion 119e has a first discharge port 119a to which the lower end of the tube 115A is connected and a second discharge port 119b to which the lower end of the tube 115B is connected. The 1st discharge port 119a is provided in the upper end of the standing part 119e, and the 2nd discharge port 119b is provided in the downward side of the standing part 119e. Similarly, the standing portion 119f has a third discharge port 119c to which the lower end of the tube 115C is connected, and a fourth discharge port 119d to which the lower end of the tube 115D is connected. The 3rd discharge port 119c is provided in the upper end of the standing part 119f, and the 4th discharge port 119d is provided in the downward side of the standing part 119f.

  The standing portions 117e, 117f, 119e, and 119f are supported by being connected to the gas accumulators 39 and 40 by the connecting member 121, for example. The connecting member 121 also contributes to connecting the two gas accumulators 39 and 40 to each other. For example, the connecting member 121 is composed of a plurality of pieces, and the two members are fixed to each tube or each accumulator by being fixed to each other with screws so that the two members sandwich and tighten each tube or each accumulator. Is done. The two members may sandwich two or more tubes or accumulators together. In the present embodiment, as shown in FIG. 9, a case where two members 121 a and 121 b obtained by dividing an oval into two are fixed to each other by screws 123 so as to sandwich the gas accumulators 39 and 40 together is illustrated. .

  The connecting member 121 is provided at a non-arranged position of the tube 115 in the longitudinal direction of the gas accumulators 39 and 40, for example. Specifically, the connecting member 121 is provided at a position below the tubes 115B and 115D and at a position between the tubes 115A (115C) and the tubes 115B (115D).

  A fifth switching valve 99 (FIG. 9) that opens and closes according to the atmospheric temperature is provided adjacent to the lower portion of the gas accumulators 39 and 40. The fifth switching valve 99 is provided in the supply pipe 117 at a position upstream of the standing portions 117e and 117f. The gas accumulators 39 and 40 may be provided at appropriate positions such as a position slightly away from the piston accumulator 37 and the injection cylinder device 27.

  In the cooling system 79 having the above configuration, when the atmospheric temperature in the vicinity of the gas accumulators 39 and 40 exceeds a predetermined threshold value, the fifth switching valve 99 is opened and the flow of the cooling medium is allowed. The cooling medium flows from below to above in the standing portions 117e and 117f of the supply pipe 117, flows from above to below in the tubes 115A to 115D, and flows from above to below in the standing portions 119e and 119f of the discharge pipe 119. . The cooling medium branches into four in the tubes 115A to 115D and flows in parallel.

  FIG. 10 is a diagram showing a cross-sectional shape orthogonal to the longitudinal direction of the tube 109 (115). The tube 109 has a semicircular cross section. Accordingly, the tube 109 has a flat portion 109 a extending along the longitudinal direction of the tube 109. The tube 109 is wound so that the flat portion 109 a comes into contact with the outer peripheral surface of the gas accumulator 85. The cross-sectional shape of the tube 109 may be a strict semicircle (the plane portion 109a is located at the center of the arc) or may be smaller than the strict semicircle (the plane portion 109a is smaller than the center of the arc). May also be larger than a strict semicircle.

  According to the above embodiment, the hydraulic device 29 includes the injection cylinder device 27, the piston accumulator 37, and the gas accumulator 39. The piston type accumulator 37 can accommodate the working fluid supplied to the injection cylinder device 27 and the compressed gas that applies pressure to the working fluid. The gas-type accumulator 39 can store hydraulic fluid and compressed gas that exert pressure on each other, has a larger volume than the piston-type accumulator 37, and communicates with the piston-type accumulator 37 so that gas can flow. Further, the hydraulic device 29 supplies hydraulic fluid to the piston accumulator 37 and allows the pump 45 that can compress the gas in the piston accumulator 37 and the gas accumulator 39 and the inflow and outflow of the hydraulic fluid in the gas accumulator. Or it has the 1st cock 69 which can be prohibited. Furthermore, the hydraulic device 29 has a flexible tube 115 that is wound around the outer circumference of the gas accumulator 39 in a spiral shape and can flow a cooling medium.

  Therefore, a rise in the temperature of the gas in the gas accumulator 39 due to an increase in the atmospheric temperature or the like can be suppressed, and fluctuations in the pressure of the gas accumulator 39 can be suppressed. As a result, the pressure of the hydraulic fluid supplied from the piston type accumulator 37 to the injection cylinder device 27 is stabilized. Further, it is possible to reduce the necessity of adjusting the amount of the hydraulic fluid in the gas accumulator 39 (and hence the gas pressure) by opening and closing the first cock 69 according to the temperature change. Since the cooling is performed on the gas accumulator 39, only the gas sealed in the accumulator can be intensively cooled. In other words, in the hydraulic device that does not have the gas accumulator 39, when the piston accumulator (37) is cooled, the cooling fluid cooling capacity is deprived by the working fluid circulating in the hydraulic circuit. There is no such disadvantage. Since it is only necessary to wrap the tube 115 around the gas accumulator 39, no major design change occurs, and gas cooling can be realized easily and inexpensively.

  The hydraulic device 29 has a fifth switching valve 99 that allows the cooling medium to flow into the tube 115 when the ambient atmospheric temperature exceeds a predetermined threshold value. Therefore, the gas temperature of the gas type accumulator 39 can be suitably stabilized from a long-term viewpoint. That is, the gas temperature in the gas accumulator 39 frequently changes due to accumulation and discharge of the accumulator, but the flow of the cooling medium is suppressed from being frequently controlled by such a short-term temperature change.

  The tube 115 is formed of an elastic member, and is wound around the gas accumulator 39 in a state of being elastically deformed by applying a tension. Therefore, as described above, the tube 115 tightens the gas accumulator 39 with a restoring force. As a result, the tube 115 can be easily fixed to the gas accumulator 39, the adhesion between the tube 115 and the gas accumulator 39 is improved, and the cooling effect by the tube 115 is improved.

  The tube 115 has a flat portion 115a extending along the longitudinal direction of the tube 115 by forming a cross-sectional shape perpendicular to the longitudinal direction of the tube 115 into a semicircular shape, and the flat portion 115a is a gas accumulator. It is wound so as to contact the outer peripheral surface of 39. Accordingly, the contact area between the tube 115 and the gas accumulator 39 is increased, and the cooling effect by the tube 115 is improved.

  The gas accumulator 39 is formed in an elongated shape that is long in the vertical direction, and the tube 115 is wound around the gas accumulator 39 with the vertical direction as the axial direction of the spiral, and the upper side and the lower side are upstream and It is downstream. Accordingly, by flowing the cooling medium using the dead weight of the cooling medium in the long tube 115 wound spirally, it is possible to reduce the force and work amount for sending the cooling medium as the entire cooling flow path.

  The gas accumulator 39 is formed in a long shape. The tube 115 (115A and 115B) is wound around the gas accumulator 39 with the longitudinal direction of the gas accumulator 39 being the axial direction of the spiral. A plurality of tubes 115A and 115B are arranged in the longitudinal direction of the gas accumulator 39 and connected in parallel to each other with respect to the flow of the cooling medium. Therefore, the gas accumulator 39 is cooled in parallel for each part in the longitudinal direction, and is cooled uniformly in the entire longitudinal direction.

  The hydraulic device 29 includes a supply pipe 117 that supplies a cooling medium to the tube 115 and a discharge pipe 119 from which the cooling medium of the tube 115 is discharged. The hydraulic device 29 includes a connecting member 121 that is connected to the supply pipe 117 and the discharge pipe 119 and is connected to a portion between the tubes 115A and 115B of the gas accumulator 39. Therefore, the portion between the tubes 115A and 115B divided in order to cool the gas accumulator 39 evenly in the longitudinal direction is effectively used to support the supply pipe 117 and the discharge pipe 119. As a result, effective cooling is realized as a whole with a small configuration.

  By applying the hydraulic device 29 having such an effect to the injection device 5, the operation of injecting the molten metal into the cavity Ca is stabilized, and the quality variation of the die-cast product is suppressed.

  In addition, the above-described effects in the hydraulic pressure device 29 are also exhibited in the hydraulic pressure device 81 in the mold clamping device 3. Then, by applying the hydraulic device 81 having such an effect to the mold clamping device 3, the mold closing operation is stabilized, and for example, the mold 501 is prevented from being damaged by an impact at the time of mold contact. The

  In the above embodiment, the hydraulic devices 29 and 81 are examples of the hydraulic device of the present invention, and the injection cylinder device 27 and the mold clamping cylinder device 15 are examples of the hydraulic cylinder device of the present invention. The piston accumulators 37 and 84 are examples of the first accumulator of the present invention, the gas accumulators 39, 40 and 85 are examples of the second accumulator of the present invention, respectively, and the first cock 69 is the storage of the present invention. Each of the fifth switching valve 99 and the fourth switching valve 89 is an example of a first control valve according to the present invention.

  The present invention is not limited to the above embodiment, and may be implemented in various aspects.

  A hydraulic apparatus is not limited to what is applied to a molding machine. For example, it may be applied to a construction machine. When the hydraulic device is applied to a molding machine, the hydraulic device is not limited to that applied to an injection device or a mold clamping device. For example, the hydraulic device may be a hydraulic device for driving a core. Further, the molding machine to which the hydraulic device is applied is not limited to the die casting machine. For example, an injection molding machine that molds a resin may be used. The molding machine is not limited to a cold chamber machine, and may be a hot chamber machine. Further, the molding machine is not limited to a horizontal mold clamping horizontal injection type, and may be a horizontal mold clamping type or a vertical injection type. The mold clamping method is not limited to the toggle method, and may be, for example, a direct pressure type that directly transmits the driving force of the hydraulic cylinder device to the die plate.

  The first accumulator that supplies the hydraulic fluid to the hydraulic cylinder device is not limited to the piston type accumulator. For example, the first accumulator may be a gas accumulator or a bladder accumulator. Moreover, the 2nd accumulator which expands a 1st accumulator is not limited to a gas type accumulator. For example, the second accumulator may be a piston type accumulator or a bladder type accumulator.

  In the embodiment, the determination of the completion of pressure accumulation in each cycle is performed based on the determination of the piston of the first accumulator. However, completion of pressure accumulation in each cycle may be performed based on the pressure of the accumulator. That is, a sensor for detecting the pressure of the accumulator may be provided, and the completion of pressure accumulation may be determined when the detection value of the sensor reaches a predetermined value. In this case, the volume of gas in the accumulator when accumulating up to a predetermined pressure is kept constant by suppressing the temperature change. As a result, the influence of the temperature change on the pressure change of the accumulator in the discharge process of the hydraulic fluid is mitigated.

  The valve for controlling the flow of the hydraulic fluid in the hydraulic device may be appropriately disposed, and the valve exemplified in the embodiment may be appropriately replaced with another type of valve. For example, the storage amount adjusting valve may be configured by a switching valve. The first control valves (99, 89) that allow the flow of the cooling medium when the ambient atmospheric temperature exceeds a predetermined first threshold value may not be provided. For example, the flow of the cooling medium may be allowed or prohibited only by a manual cock.

  A tube is not limited to what is comprised by an elastic member, For example, you may be comprised by resin which has flexibility. Moreover, the cross-sectional shape of the tube is not limited to a semicircular shape, and may be, for example, a circular shape or a rectangular shape. When the tube is wound spirally with the vertical direction as the axial direction, the upper side of the tube may be on the downstream side, contrary to the embodiment. In this case, it is easy to flow the cooling medium with the cooling medium filled in the tube.

  The temperature adjusting medium that flows through the tube is not limited to the cooling medium. For example, a temperature raising medium that raises the temperature of a gas in a second accumulator (such as a gas accumulator 39) may be used. In this case, as a valve corresponding to the first control valve (99, 89), a second control valve that allows the temperature rising medium to flow into the tube when the ambient atmospheric temperature falls below a predetermined second threshold value. May be provided. Furthermore, both the first control valve and the second control valve may be provided.

  29 ... Hydraulic device, 27 ... Injection cylinder device (hydraulic cylinder device), 37 ... Piston accumulator (first accumulator), 39 ... Gas accumulator (second accumulator), 45 ... Pump, 69 ... First cock ( Retention amount adjusting valve), 115... Tube.

Claims (8)

A hydraulic cylinder device;
A first accumulator capable of accommodating a hydraulic fluid supplied to the hydraulic cylinder device and a compressed gas that applies pressure to the hydraulic fluid;
A second accumulator capable of containing a working fluid and a compressed gas that exert pressure on each other, having a larger volume than the first accumulator, and being in fluid communication with the first accumulator;
A pump capable of compressing the gas of the first accumulator and the second accumulator by supplying hydraulic fluid to the first accumulator;
A reservoir adjustment valve capable of allowing or prohibiting the inflow and outflow of the hydraulic fluid in the second accumulator;
A flexible tube wound spirally around the outer circumference of the second accumulator and capable of flowing a temperature adjusting medium;
A hydraulic device. A first control valve that allows the cooling medium as the temperature adjusting medium to flow into the tube when the ambient air temperature exceeds a predetermined first threshold; and the ambient air temperature is a predetermined second threshold The hydraulic apparatus according to claim 1, further comprising at least one of a second control valve that allows a temperature rising medium as the temperature adjusting medium to flow into the tube when the temperature falls below the value. The hydraulic apparatus according to claim 1, wherein the tube is formed of an elastic member and wound around the second accumulator in a state of being elastically deformed by a tension. The tube has a flat surface portion extending along the longitudinal direction of the tube by forming a cross-sectional shape perpendicular to the longitudinal direction of the tube in a semicircular shape, and the flat surface portion of the second accumulator The hydraulic device according to any one of claims 1 to 3, wherein the hydraulic device is wound so as to abut on an outer peripheral surface. The second accumulator is formed in a long shape in the vertical direction,
The hydraulic device according to any one of claims 1 to 4, wherein the tube is wound around the second accumulator with a vertical direction as a spiral axial direction, and an upper side is an upstream side. The second accumulator is formed in a long shape,
The tube is wound around the second accumulator with the longitudinal direction of the second accumulator as a spiral axial direction,
The hydraulic device according to claim 1, wherein the plurality of tubes are arranged in a longitudinal direction of the second accumulator and are connected in parallel to each other with respect to the flow of the temperature adjustment medium. A supply pipe for supplying the temperature adjusting medium to the plurality of tubes;
A discharge pipe through which the temperature adjusting medium of the plurality of tubes is discharged;
A connecting member connected to the supply pipe and the discharge pipe and connected to a portion between the plurality of tubes of the second accumulator;
The hydraulic device according to claim 6, comprising: An injection sleeve communicating with the cavity;
An injection plunger slidable in the injection sleeve;
A hydraulic cylinder device capable of driving the injection plunger;
A first accumulator capable of accommodating a hydraulic fluid supplied to the hydraulic cylinder device and a compressed gas that applies pressure to the hydraulic fluid;
A second accumulator capable of containing a working fluid and a compressed gas that exert pressure on each other, having a larger volume than the first accumulator, and being in fluid communication with the first accumulator;
A pump capable of compressing the gas of the first accumulator and the second accumulator by supplying hydraulic fluid to the first accumulator;
A reservoir adjustment valve capable of allowing or prohibiting the inflow and outflow of the hydraulic fluid in the second accumulator;
A flexible tube wound spirally around the outer circumference of the second accumulator and capable of flowing a temperature adjusting medium;
Having an injection device.

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