JP2014177115A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine which can hold a lubricant between friction members.SOLUTION: An injection molding machine 10 includes: a first friction member 24 and a second friction member 23 between which a lubricant 42 is supplied; an expansion and contraction member 41 which is disposed around the first friction member 24 and the second friction member 23; a first mounting member 33 to which one end of the expansion and contraction member 41 is mounted; and a second mounting member 35 to which the other end of the expansion and contraction member 41 is mounted. A position of the second mounting member 35 with respect to the first mounting member 33 and a position of the second friction member 23 with respect to the first friction member 24 are displaced in conjunction with each other. The expansion and contraction member 41 forms a storage space 43, which stores the lubricant 42, around the first friction member 24 and the second friction member 23 and expands and contracts according to a clearance between the first mounting member 33 and the second mounting member 35.

Description

  The present invention relates to an injection molding machine.

  The injection molding machine has a friction member such as a ball screw shaft and a ball screw nut (see, for example, Patent Document 1). Grease is mainly used for lubrication between friction members. Grease is a semi-solid state obtained by mixing a thickener with lubricating oil and is easily held between friction members.

JP 2011-183705 A

  When lubricating oil having better fluidity than grease is used for lubrication between the friction members, the lubricating oil was likely to be washed away between the friction members.

  The present invention has been made in view of the above problems, and an object thereof is to provide an injection molding machine capable of holding lubricating oil between friction members.

In order to solve the above problems, according to one aspect of the present invention,
A first friction member;
A second friction member to which lubricating oil is supplied between the first friction member;
A telescopic member disposed around the first friction member and the second friction member;
A first attachment member to which one end of the elastic member is attached;
A second attachment member to which the other end of the elastic member is attached;
The position of the second mounting member relative to the first mounting member and the position of the second friction member relative to the first friction member are displaced in conjunction with each other,
The expansion and contraction member forms a storage space for storing the lubricating oil around the first friction member and the second friction member, and is formed at an interval between the first attachment member and the second attachment member. An injection molding machine is provided that expands and contracts accordingly.

  According to one aspect of the present invention, an injection molding machine that can hold lubricating oil between friction members is provided.

It is a partial sectional view showing an injection molding machine by one embodiment of the present invention. FIG. 2 is a partially enlarged view of FIG. 1. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2, showing a peripheral device of a storage space in which lubricating oil is accumulated around a spline coupling mechanism. FIG. 3 is a top view of FIG. 2. It is sectional drawing along the VV line of FIG. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5, showing a peripheral device in a storage space in which lubricating oil is accumulated around a ball screw mechanism. It is a figure which shows the mold clamping apparatus of the injection molding machine by one Embodiment of this invention. It is sectional drawing which shows the principal part of the injection molding machine by another one Embodiment of this invention, Comprising: It is sectional drawing equivalent to FIG. It is sectional drawing along the IX-IX line of FIG. It is sectional drawing along the XX line of FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In each of the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and description thereof will be omitted. Further, the description will be made assuming that the moving direction of the screw when discharging the molding material from the cylinder is the front, and the moving direction of the screw when storing the molding material in the front part of the cylinder is the rear.

  FIG. 1 is a partial sectional view showing an injection molding machine according to an embodiment of the present invention. FIG. 2 is a partially enlarged view of FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2 and is a view showing a peripheral device of the storage space in which lubricating oil is accumulated around the spline coupling mechanism. FIG. 4 is a top view of FIG. FIG. 5 is a cross-sectional view taken along the line VV in FIG. FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 5 and shows a peripheral device of the storage space in which lubricating oil is accumulated around the ball screw mechanism.

  As shown in FIGS. 1 and 4, the injection molding machine 10 advances a cylinder 11, a screw 13 disposed in the cylinder 11, a measuring motor 15 as a rotation driving unit that rotates the screw 13, and the screw 13. An injection motor 16 as a movement drive unit is provided.

  A hopper 14 as a material supply unit that supplies a molding material (for example, resin pellets) to the inside of the cylinder 11 is provided at the rear portion of the cylinder 11. In addition, although the material supply part of this embodiment is comprised with the hopper 14, you may be comprised with the feed screw etc. which can adjust supply_amount | feed_rate.

  The screw 13 is disposed in the cylinder 11 so as to be rotatable and movable back and forth. A spiral groove 13a is formed in the screw 13, and a molding material is supplied from the hopper 14 into the groove 13a. When the screw 13 rotates, the molding material is fed forward along the spiral groove 13a. The depth of the groove 13a may be constant or may vary depending on the location.

  A shaft portion 21 extending rearward from the screw 13 is connected to a drive shaft 23 via a coupling 22. The drive shaft 23 rotates with the screw 13 and advances and retreats with the screw 13. A rotation shaft 24 is connected to the drive shaft 23. The screw 13, the shaft part 21, the drive shaft 23, and the rotating shaft 24 are coaxially arranged in this order. Further, the rotation transmission unit 26 (see FIG. 1) is configured by the drive shaft 23, the rotation shaft 24, and the like.

  The rotation transmission unit 26 is disposed behind the screw 13 in the axial direction, and transmits the rotation of the metering motor 15 to the screw 13. The rotation transmission unit 26 has a rotation shaft 24 as a first transmission member disposed on the weighing motor 15 side and a second shaft disposed on the screw 13 side in the rotation transmission path from the weighing motor 15 to the screw 13. And a drive shaft 23 as a transmission member. The rotary shaft 24 and the drive shaft 23 are connected so as to be relatively movable.

  The rotary shaft 24 rotates with the drive shaft 23 and allows the drive shaft 23 to advance and retract. For example, as shown in FIG. 2, the spline nut portion 23 a formed on the drive shaft 23 and the spline shaft portion 24 a formed on the rotating shaft 24 mesh with each other. For example, as shown in FIG. 3, the spline shaft portion 24 a is configured by a rod-shaped portion and a plurality of convex strip portions provided on the outer periphery of the rod-shaped portion. The spline nut portion 23a includes, for example, a tubular portion and a plurality of concave strip portions provided on the inner periphery of the tubular portion. The concave strip portion of the spline nut portion 23a meshes with the convex strip portion of the spline shaft portion 24a. The spline nut portion 23a and the spline shaft portion 24a constitute a spline coupling mechanism.

  Note that the configurations of the drive shaft 23 and the rotary shaft 24 may vary widely. For example, the arrangement of the spline shaft portion 24a and the spline nut portion 23a may be reversed, the spline shaft portion may be formed on the drive shaft 23, and the spline nut portion may be formed on the rotary shaft 24. In addition, it is only necessary that one or more ridges or one or more ridges be provided on the outer periphery of the rod-like portion of the spline shaft portion. When the concave strip portion is provided on the outer periphery of the rod-shaped portion of the spline shaft portion, the convex strip portion is provided on the inner periphery of the cylindrical portion of the spline nut portion. Further, a pin may be fixed to one of the drive shaft 23 and the rotary shaft 24, and a concave portion that engages with the pin may be formed on the other. The pin fixed to one side is inserted so as to be able to advance and retreat with respect to the recess formed on the other side.

  The metering motor 15 (see FIG. 4) rotates the screw 13 in the cylinder 11. The rotation of the metering motor 15 is transmitted to the speed reducer 25 via a belt or a pulley. The rotating shaft 24 is rotated with a torque corresponding to the reduction ratio of the speed reducer 25, and the screw 13 is rotated together with the rotating shaft 24. The belt, the pulley, the speed reducer 25, and the like may be omitted, and the output shaft of the metering motor 15 may be coaxially connected to the rotating shaft 24.

  The weighing motor 15 is fixed to the base 31 as shown in FIG. 4, and the front support 32 and the rear support 33 are fixed to the base 31 as shown in FIGS. The base 31 moves forward and backward with respect to the frame Fr of the injection molding machine 10 in order to make the nozzle 12 of the cylinder 11 contact and separate from the mold device 87 (see FIG. 7). A rear end portion of the cylinder 11 is attached to the front support 32. The front support 32 and the rear support 33 are connected by a plurality of (for example, four) guide bars 34. The guide bar 34 guides the advance and retreat of the pressure plate 35 disposed between the front support 32 and the rear support 33. An insertion hole through which the guide bar 34 is inserted is formed in the pressure plate 35. The injection frame 30 is configured by the base 31, the front support 32, the rear support 33, and the guide bar 34. The metering motor 15 only needs to be fixed to the injection frame 30 and may be fixed to any of the base 31, the front support 32, the rear support 33, and the guide bar 34.

  In addition, although the injection frame 30 of this embodiment is comprised by the base 31, the front support 32, the back support 33, and the guide bar 34, the structure is not specifically limited. For example, instead of the guide bar 34, a guide rail may be provided on the base 31, and the guide rail may guide the advance / retreat of the pressure plate 35.

  The pressure plate 35 is a movable member that can move forward and backward with respect to the base 31. As shown in FIG. 2, the pressure plate 35 holds bearings 36 and 37 that rotatably support the drive shaft 23, and moves forward and backward with the drive shaft 23 with respect to the base 31.

  The injection motor 16 (see FIGS. 4 and 5) moves the screw 13 in the cylinder 11. The injection motor 16 advances and retracts the drive shaft 23 by moving the pressure plate 35 forward and backward with respect to the base 31, for example. The rotational motion of the injection motor 16 is converted into a linear motion of the drive shaft 23 by the ball screw mechanism 27 shown in FIG. 5, and the screw 13 is advanced and retracted together with the drive shaft 23.

  The ball screw mechanism 27 includes a ball screw shaft 27a and a ball screw nut 27b that is screwed with the ball screw shaft 27a. The ball screw shaft 27a is coaxially connected to the output shaft of the injection motor 16, but may be connected to the output shaft of the injection motor 16 via a belt, a pulley, or the like. The injection motor 16 is fixed to the pressure plate 35, and the ball screw nut 27 b is fixed to the front support 32.

  When the injection motor 16 is driven, the ball screw shaft 27a advances and retreats while rotating, and the pressure plate 35 advances and retreats. The operation of the ball screw mechanism 27 when the injection motor 16 is driven is not limited to the above operation. For example, when the injection motor 16 is driven, the pressure plate 35 may be advanced and retracted by rotating the ball screw shaft 27a and advancing and retracting the ball screw nut 27b. Examples of such a case include a case where the ball screw nut 27 b is fixed to the pressure plate 35 and the injection motor 16 is fixed to the front support 32 or the rear support 33. Further, when the injection motor 16 is driven, the ball screw nut 27b rotates and the ball screw shaft 27a advances and retracts, so that the pressure plate 35 may advance and retract. In such a case, for example, a bearing that rotatably supports a shaft portion extending from the ball screw shaft 27a is fixed to the pressure plate 35, and a bearing that rotatably supports the ball screw nut 27b is a front support 32 or a rear support. The case where it fixes to 33 is mentioned.

  As shown in FIG. 1, a rotation transmitting portion 26 disposed behind the screw 13 in the axial direction and transmitting the rotation of the metering motor 15 to the screw 13 includes a drive shaft 23 and a rotation shaft 24 that are connected to each other so as to be relatively movable. Have Therefore, when the drive motor 23 is moved by driving the injection motor 16, the rotary shaft 24 connected to the drive shaft 23 and the metering motor 15 that rotates the rotary shaft 24 do not have to move. Therefore, the energy consumption of the injection motor 16 can be reduced as compared with the conventional case where the injection motor moves the metering motor. Further, the injection motor 16 can be downsized.

  A plurality of injection motors 16 may be provided as shown in FIG. 4, and a plurality of ball screw mechanisms 27 for converting the rotation of the injection motor 16 into the advance and retreat of the pressure plate 35 may be provided. The plurality of ball screw mechanisms 27 are disposed symmetrically about the center line of the screw 13. A force that pushes the pressure plate 35 forward is generated symmetrically about the center line of the screw 13, and bending deformation of the screw 13 can be suppressed.

  FIG. 7 is a view showing a mold clamping device of an injection molding machine according to an embodiment of the present invention. In the description of the mold clamping device, the moving direction of the movable platen when closing the mold will be referred to as the front, and the moving direction of the movable platen when opening the mold will be described as the rear.

  The mold clamping device of the injection molding machine 10 includes a fixed platen 81, a movable platen 82, a toggle support 83, a tie bar 84, a toggle mechanism 90, a mold clamping motor 96, and the like.

  The fixed platen 81 may be fixed to the frame Fr. A toggle support 83 is disposed at a distance from the fixed platen 81. The toggle support 83 and the fixed platen 81 are connected by a plurality of (for example, four) tie bars 84. In order to allow extension of the tie bar 84 during mold clamping, the toggle support 83 is placed so as to be able to advance and retreat with respect to the frame Fr.

  The movable platen 82 is disposed between the fixed platen 81 and the toggle support 83, and can move forward and backward along the guide Gd laid on the frame Fr. A movable mold 85 is attached to the surface of the movable platen 82 that faces the fixed platen 81. On the other hand, a fixed mold 86 is attached to a surface of the fixed platen 81 facing the movable platen 82. The fixed mold 86 and the movable mold 85 constitute a mold device 87. When the movable platen 82 moves forward, the movable mold 85 and the fixed mold 86 come into contact with each other, and the mold is closed. When the movable platen 82 moves backward, the movable mold 85 and the fixed mold 86 are separated from each other, and the mold is opened.

  The toggle mechanism 90 is disposed between the movable platen 82 and the toggle support 83. The toggle mechanism 90 includes, for example, a cross head 91 that can move forward and backward with respect to the frame Fr, and a plurality of links that transmit a propulsive force input to the cross head 91 to the movable platen 82.

  The mold clamping motor 96 operates the toggle mechanism 90 and may be a servo motor. The mold clamping motor 96 operates the toggle mechanism 90 via a ball screw mechanism 97 or the like as a motion conversion unit that converts a rotational motion into a linear motion.

  The ball screw mechanism 97 includes a ball screw shaft 97a and a ball screw nut 97b screwed with the ball screw shaft 97a. The ball screw shaft 97a is connected to the output shaft of the mold clamping motor 96 via a belt, a pulley, or the like, but may be connected coaxially to the output shaft. A bearing that rotatably supports the ball screw shaft 97 a is held by a toggle support 83, and the ball screw nut 97 b is fixed to the cross head 91.

  When the mold clamping motor 96 is driven, the ball screw shaft 97 a rotates and the ball screw nut 97 b advances and retreats, whereby the cross head 91 advances and retreats, and the movable platen 82 contacts and separates from the fixed platen 81. The operation of the ball screw mechanism 97 when the mold clamping motor 96 is driven is not limited to the above operation.

  Next, the operation of the injection molding machine 10 will be described. The injection molding machine 10 includes a mold closing process for closing the mold apparatus 87, a mold clamping process for tightening the mold apparatus 87, a filling process for pouring molten molding material into the mold apparatus 87 in a mold-clamped state, and a molding material poured into the mold apparatus 87. A pressure holding step for applying pressure, a cooling step for solidifying the molding material in the mold device 87 after the pressure holding step, a metering step for measuring the molding material for the next molded product, a mold opening step for opening the mold device 87, And the extrusion process which protrudes a molded article from the metal mold | die apparatus 87 after a mold opening is performed. The injection molding machine 10 repeatedly manufactures a molded product by repeatedly performing these steps. In order to shorten the molding cycle, the metering step may be performed during the cooling step.

  In the measuring step, the measuring motor 15 is driven to rotate the screw 13, and the molding material supplied into the spiral groove 13 a formed in the screw 13 is fed forward. A plurality of band heaters 17 are provided on the outer periphery of the cylinder 11, and heat from the plurality of band heaters 17 is transmitted to the cylinder 11 to gradually melt the molding material that advances in the cylinder 11. As the molten molding material is fed to the front of the screw 13 and accumulated in the front part of the cylinder, the screw 13 is retracted.

  In the measuring step, the injection motor 16 may be driven so as to apply a predetermined back pressure to the screw 13 in order to limit the rapid retreat of the screw 13. When the screw 13 is retracted to a predetermined position and a predetermined amount of molding material is accumulated in front of the screw 13, the driving of the metering motor 15 and the injection motor 16 is stopped.

  In the filling process, the injection motor 16 is driven to advance the screw 13 at a set speed, and the molding material accumulated in front of the screw 13 is discharged from the nozzle 12 provided in the front part of the cylinder and comes into contact with the nozzle 12. The cavity space in the mold apparatus 87 is filled. When the screw 13 moves forward to a predetermined position (so-called V / P switching position), the pressure holding process is started. Note that when the elapsed time from the start of the filling process reaches a predetermined time, the pressure holding process may be started. The set speed of the screw 13 may be constant or may be changed according to the screw position or the elapsed time.

  In the pressure-holding step, the injection motor 16 is driven to push the screw 13 forward at a set pressure to replenish the molding material for the volume contraction due to the cooling of the molding material in the cavity space. After the entrance (so-called gate) of the cavity space is sealed with the solidified molding material and the backflow of the molding material from the cavity space is prevented, the cooling process is started. During the cooling step, a metering step for weighing the molding material for the next molded part may be performed. The set pressure of the screw 13 may be constant or may be changed according to the elapsed time.

  Next, a feature of the injection molding machine 10 will be described with reference to FIGS. As shown in FIGS. 2 to 3, the injection molding machine 10 forms a storage space 43 for storing lubricating oil 42 around the rotation shaft (first friction member) 24 and the drive shaft (second friction member) 23. The elastic member 41 is provided. The first friction member is a shaft member, and the second friction member is a hole member that is connected to the shaft member so as to be displaceable in the axial direction and has an insertion hole for inserting the shaft member.

  The elastic member 41 is disposed between the rear support (first attachment member) 33 and the pressure plate 35 (second attachment member), and expands and contracts in accordance with the interval. One end of the elastic member 41 is attached to the rear support 33, and the other end of the elastic member 41 is attached to the pressure plate 35. The position of the pressure plate 35 relative to the rear support 33 and the position of the drive shaft 23 relative to the rotating shaft 24 are displaced in conjunction with each other.

  The elastic member 41 may be formed in a cylindrical shape so as to surround the drive shaft 23 and the rotary shaft 24 in order to prevent the lubricating oil 42 from scattering. The telescopic member 41 may be, for example, a telescopic type, and includes a movable cylindrical portion 41 a attached to the pressure plate 35 and a fixed cylindrical portion 41 b attached to the rear support 33.

  The telescopic member 41 forms a storage space 43 that accumulates the lubricating oil 42 around the drive shaft 23 and the rotary shaft 24 between the pressure plate 35 and the rear support 33. The lubricating oil 42 is supplied between the drive shaft 23 and the rotation shaft 24 and lubricates between the drive shaft 23 and the rotation shaft 24. The lubricating oil 42 may be in contact with at least a part of the drive shaft 23 and the rotary shaft 24. Since the lubricating oil 42 can be held in the storage space 43, it can be held between the drive shaft 23 and the rotating shaft 24.

  The lubricating oil 42 in the storage space 43 may be supplied to the sliding portions of the bearings 36 and 37 that rotatably support the drive shaft 23 and the bearing 38 that rotatably supports the rotating shaft 24. For example, in the case of a rolling bearing, the space between the outer ring and the inner ring communicates with the storage space 43, and the lubricating oil 42 is supplied to rolling elements (balls or rollers) disposed between the outer ring and the inner ring. Is done.

  The drive shaft 23 is inserted into an insertion hole 35 a formed in the pressure plate 35, and a gap between the wall surface of the insertion hole 35 a and the drive shaft 23 is closed with a seal 56. The seal 56 is disposed in front of the bearings 36 and 37 of the drive shaft 23 and prevents the lubricating oil of the bearings 36 and 37 from flowing out to the side opposite to the storage space 43.

  Similarly, the rotation shaft 24 is inserted into an insertion hole 33 a formed in the rear support 33, and a gap between the wall surface of the insertion hole 33 a and the rotation shaft 24 is closed with a seal 57. The seal 57 is disposed behind the bearing 38 of the rotating shaft 24 disposed in the insertion hole 33a, and prevents the lubricating oil of the bearing 38 from flowing out to the side opposite to the storage space 43.

  As shown in FIG. 3, the supply unit 50 supplies the lubricating oil 42 to the storage space 43. The supply unit 50 includes, for example, a supply motor 51, a supply pump 52, a supply tank 53, a supply pipe 54, and the like. The supply motor 51 drives the supply pump 52 to send the lubricating oil stored in the supply tank 53 to the supply pipe 54 and supply it to the storage space 43. In addition, the structure of the supply part 50 is not limited to said structure. For example, the supply pipe 54 may not be provided, and the supply pump 52 may be directly connected to the inlet 44 of the storage space 43.

  In the case where the inlet 44 of the storage space 43 is formed in the telescopic member 41, it may be formed not in the movable tubular portion 41a but in the fixed tubular portion 41b. When the supply pump 52 is fixed to the injection frame 30, the positional relationship between the supply pump 52 and the inlet 44 of the storage space 43 does not change when the pressure plate 35 advances and retreats. Easy to connect. In addition, the inlet 44 of the storage space 43 may be formed in the rear support 33 to which the fixed cylindrical portion 41b is attached.

  The discharge unit 60 discharges the lubricating oil 42 from the storage space 43 to the outside. The discharge part 60 is comprised by the discharge pipe 61 etc., for example. The discharge pipe 61 naturally discharges excess lubricating oil in the storage space 43 by gravity and returns it to the supply tank 53. When the volume of the storage space 43 fluctuates with the expansion and contraction of the expansion / contraction member 41, the excess lubricating oil 42 is naturally discharged by gravity, and the amount of the lubricating oil 42 in the storage space 43 can be automatically adjusted. Since the amount of the lubricating oil 42 is automatically adjusted, the supply unit 50 may continuously supply the lubricating oil 42 to the storage space 43 at a predetermined flow rate.

  In addition, the structure of the discharge part 60 is not limited to said structure. For example, the discharge unit 60 may include a discharge pump that sucks the lubricating oil 42 in the storage space 43 and a discharge motor that drives the discharge pump. When the amount of the lubricating oil 42 in the storage space 43 exceeds the upper limit value, the lubricating oil 42 in the storage space 43 can be forcibly discharged. Further, the discharge unit 60 may include a recovery tank that recovers the lubricating oil discharged from the storage space 43.

  The lubricating oil 42 in the storage space 43 is agitated and warmed by the movement of the drive shaft 23 and the rotating shaft 24. Since the lubricating oil 42 is discharged from the storage space 43 to the outside, heat is taken out to the outside, and the temperature rise of the storage space 43 can be suppressed.

  When the lubricating oil discharged from the storage space 43 is returned to the supply tank 53, a cooler 55 for cooling the lubricating oil 42 may be provided. The cooler 55 is provided in the supply pipe 54, for example, and cools the lubricating oil by exchanging heat with the supply pipe 54. The cooler 55 may be provided anywhere in the lubricating oil circulation path.

  The outlet 45 of the storage space 43 is provided above the lower end of the drive shaft 23 and the lower end of the rotary shaft 24 so that at least a part of the drive shaft 23 and the rotary shaft 24 is immersed in the lubricating oil 42. When the outlet 45 of the storage space 43 is formed in the telescopic member 41, it may be formed not in the movable tubular portion 41a but in the fixed tubular portion 41b. When the supply tank 53 is fixed to the injection frame 30, the positional relationship between the supply tank 53 and the outlet 45 of the storage space 43 does not change when the pressure plate 35 advances and retreats. Easy to connect. In addition, the exit 45 may be formed in the back support 33 to which the fixed side cylindrical part 41b is attached instead of the fixed side cylindrical part 41b.

  The detection unit 46 detects the amount of the lubricating oil 42 in the storage space 43. The amount of the lubricating oil 42 in the storage space 43 can be managed. The detection unit 46 includes a liquid level sensor. The liquid level sensor may be either a non-contact type or a contact type. As the non-contact type, for example, there is one that measures the time from when an ultrasonic wave or the like is transmitted toward the liquid surface of the lubricating oil 42 until the reflected wave is received. Instead of ultrasonic waves, electromagnetic waves such as light may be used. As the contact type, for example, there is one that detects the position of the float that moves up and down in accordance with the fluctuation of the liquid level of the lubricating oil 42.

  The detection unit 46 may detect the level of the lubricating oil 42 in the storage space 43 by detecting the level of the lubricating oil in the detection space 48 that communicates with the storage space 43 via the flow path 47. The detection space 48 is formed in the detection container 49, and the volume of the detection space 48 is constant. When the volume of the storage space 43 varies with the expansion and contraction of the expansion and contraction member 41, the liquid level of the lubricating oil 42 in the storage space 43 varies and the lubricating oil 42 passes through the flow path 47. At this time, flow resistance occurs, and fluctuations in the liquid level of the lubricating oil 42 in the detection space 48 are suppressed. The detection result of the liquid level can be smoothed.

  The detection unit 46 outputs the detection result to the controller 18. The controller 18 includes a CPU, a memory, and the like, and realizes various functions by causing the CPU to execute a program stored in the memory.

  The controller 18 operates the output unit 19 that outputs an alarm based on the detection result of the detection unit 46. For example, the controller 18 operates the output unit 19 when the amount of the lubricating oil 42 in the storage space 43 is out of the set range (when the upper limit value is exceeded or when the lower limit value is exceeded). The alarm output by the output unit 19 is issued in the form of an image, text, sound, or the like.

  Further, the controller 18 may control the amount of the lubricating oil 42 in the storage space 43 based on the detection result of the detection unit 46. For example, when the amount of the lubricating oil 42 in the storage space 43 falls below the lower limit value, the controller 18 drives the supply motor 51 to increase the amount of the lubricating oil 42 in the storage space 43. Further, when the amount of the lubricating oil 42 in the storage space 43 exceeds the upper limit value, the controller 18 may drive a discharge motor (not shown) to reduce the amount of the lubricating oil 42 in the storage space 43.

  Next, another feature of the injection molding machine 10 will be described with reference to FIGS. 5 to 6 again. As shown in FIGS. 5 to 6, the injection molding machine 10 has a storage space 143 for storing lubricating oil 142 around a ball screw shaft (first friction member) 27 a and a ball screw nut (second friction member) 27 b. The elastic member 141 which forms is provided. The first friction member is a shaft member, and the second friction member is a hole member that is connected to the shaft member so as to be displaceable in the axial direction and has an insertion hole for inserting the shaft member.

  The expansion / contraction member 141 is disposed between the front support (first attachment member) 32 and the pressure plate (second attachment member) 35, and expands and contracts according to the interval. One end of the elastic member 141 is attached to the front support 32, and the other end of the elastic member 141 is attached to the pressure plate 35. The position of the pressure plate 35 with respect to the front support 32 and the position of the ball screw shaft 27a with respect to the ball screw nut 27b are displaced in conjunction with each other.

  The elastic member 141 may be formed in a cylindrical shape so as to surround the ball screw shaft 27a and the ball screw nut 27b in order to prevent the lubricating oil 142 from scattering. The elastic member 141 may be, for example, a telescopic type, and includes a movable side cylindrical portion 141 a attached to the pressure plate 35 and a fixed side cylindrical portion 141 b attached to the front support 32.

  The elastic member 141 forms a storage space 143 for storing the lubricating oil 142 around the ball screw shaft 27a and the ball screw nut 27b between the pressure plate 35 and the front support 32. The lubricating oil 142 is supplied between the ball screw shaft 27a and the ball screw nut 27b, and lubricates between the ball screw shaft 27a and the ball screw nut 27b. The lubricating oil 142 may be in contact with at least a part of the ball screw shaft 27a and the ball screw nut 27b. Since the lubricating oil 142 can be held in the storage space 143, it can be held between the ball screw shaft 27a and the ball screw nut 27b.

  The lubricating oil 142 in the storage space 143 may be supplied to sliding portions of bearings 136 and 137 that rotatably support the shaft portion 28 that connects the ball screw shaft 27 a and the output shaft of the injection motor 16. For example, in the case of a rolling bearing, the space between the outer ring and the inner ring communicates with the storage space 143, and lubricating oil 142 is supplied to the rolling elements (balls or rollers) disposed between the outer ring and the inner ring. Is done.

  The shaft portion 28 is inserted into an insertion hole 35 b formed in the pressure plate 35, and a gap between the wall surface of the insertion hole 35 b and the shaft portion 28 is closed with a seal 156. The seal 156 is disposed behind the bearings 136 and 137 of the shaft portion 28, and prevents the lubricating oil of the bearings 136 and 137 from flowing out to the side opposite to the storage space 143.

  The ball screw shaft 27a is inserted into an insertion hole 32b formed in the front support 32. The front support 32 may be provided with a cover member 138 that accumulates the lubricating oil 142 supplied from the storage space 143 through the insertion hole 32b.

  The supply part 150 supplies the lubricating oil 142 to the storage space 143, as shown in FIG. The supply unit 150 includes, for example, a supply motor 151, a supply pump 152, a supply tank 153, a supply pipe 154, and the like. The supply motor 151 drives the supply pump 152 to send the lubricating oil stored in the supply tank 153 to the supply pipe 154 and supply it to the storage space 143. In addition, the structure of the supply part 150 is not limited to said structure. For example, the supply pipe 154 may not be provided, and the supply pump 152 may be directly connected to the inlet 144 of the storage space 143.

  In the case where the inlet 144 of the storage space 143 is formed in the telescopic member 141, it may be formed not in the movable cylindrical portion 141a but in the fixed cylindrical portion 141b. When the supply pump 152 is fixed to the injection frame 30, the positional relationship between the supply pump 152 and the inlet 144 of the storage space 143 does not change when the pressure plate 35 advances and retreats. Easy connection. In addition, the inlet 144 of the storage space 143 may be formed in the front support 32 to which the fixed cylindrical portion 141b is attached.

  The discharge unit 160 discharges the lubricating oil 142 from the storage space 143 to the outside. The discharge unit 160 includes a discharge pipe 161, for example. The discharge pipe 161 naturally discharges excess lubricating oil in the storage space 143 by gravity and returns it to the supply tank 153. When the volume of the storage space 143 fluctuates with the expansion and contraction of the expansion / contraction member 141, excess lubricating oil 142 is naturally discharged by gravity, and the amount of the lubricating oil 142 in the storage space 143 can be automatically adjusted. Since the amount of the lubricating oil 142 is automatically adjusted, the supply unit 150 may continuously supply the lubricating oil 142 to the storage space 143 at a predetermined flow rate.

  In addition, the structure of the discharge part 160 is not limited to said structure. For example, the discharge unit 160 may include a discharge pump that sucks the lubricating oil 142 in the storage space 143 and a discharge motor that drives the discharge pump. When the amount of the lubricating oil 142 in the storage space 143 exceeds the upper limit value, the lubricating oil 142 in the storage space 143 can be forcibly discharged. Further, the discharge unit 160 may include a recovery tank that recovers the lubricating oil discharged from the storage space 143.

  The lubricating oil 142 in the storage space 143 is stirred and warmed by the movement of the ball screw shaft 27a. Since the lubricating oil 142 is discharged from the storage space 143 to the outside, heat is taken out to the outside, and the temperature rise of the storage space 143 can be suppressed.

  When the lubricating oil discharged from the storage space 143 is returned to the supply tank 153, a cooler 155 for cooling the lubricating oil 142 may be provided. The cooler 155 is provided in the supply pipe 154, for example, and cools the lubricating oil by exchanging heat with the supply pipe 154. The cooler 155 may be provided anywhere in the lubricating oil circulation path.

  The outlet 145 of the storage space 143 is provided above the lower end of the ball screw shaft 27a and the lower end of the ball screw nut 27b so that at least a part of the ball screw shaft 27a and the ball screw nut 27b is immersed in the lubricating oil 142. When the outlet 145 of the storage space 143 is formed in the telescopic member 141, it may be formed not in the movable side cylindrical part 141a but in the fixed side cylindrical part 141b. When the supply tank 153 is fixed to the injection frame 30, the positional relationship between the supply tank 153 and the outlet 145 of the storage space 143 does not change when the pressure plate 35 advances and retreats, so the supply tank 153 and the outlet 145 of the storage space 143 Easy connection. In addition, the exit 145 may be formed in the front support 32 to which the fixed side cylindrical part 141b is attached instead of the fixed side cylindrical part 141b.

  The detection unit 146 detects the amount of the lubricating oil 142 in the storage space 143. The amount of the lubricating oil 142 in the storage space 143 can be managed. The detection unit 146 includes a liquid level sensor. The liquid level sensor may be either a non-contact type or a contact type.

  The detection unit 146 may detect the level of the lubricating oil 142 in the storage space 143 by detecting the level of the lubricating oil in the detection space 148 communicating with the storage space 143 via the flow path 147. The detection space 148 is formed in the detection container 149, and the volume of the detection space 148 is constant. When the volume of the storage space 143 varies with the expansion and contraction of the expansion / contraction member 141, the liquid level of the lubricating oil 142 in the storage space 143 varies and the lubricating oil 142 passes through the flow path 147. At this time, flow resistance is generated, and fluctuations in the liquid level of the lubricating oil 142 in the detection space 148 are suppressed. The detection result of the liquid level can be smoothed.

  The detection unit 146 outputs the detection result to the controller 18. The controller 18 operates the output unit 19 that outputs an alarm based on the detection result of the detection unit 146. For example, the controller 18 operates the output unit 19 when the amount of the lubricating oil 142 in the storage space 143 is out of the set range (when the upper limit value is exceeded or when the lower limit value is exceeded). The alarm output by the output unit 19 is issued in the form of an image, text, sound, or the like.

  Further, the controller 18 may control the amount of the lubricating oil 142 in the storage space 143 based on the detection result of the detection unit 146. For example, when the amount of the lubricating oil 142 in the storage space 143 falls below the lower limit value, the controller 18 drives the supply motor 151 to increase the amount of the lubricating oil 142 in the storage space 143. Further, when the amount of the lubricating oil 142 in the storage space 143 exceeds the upper limit value, the controller 18 may drive a discharge motor (not shown) to reduce the amount of the lubricating oil 142 in the storage space 143.

  FIG. 8 is a cross-sectional view showing a main part of an injection molding machine according to another embodiment of the present invention, and is a cross-sectional view corresponding to FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. In FIG. 9, a supply part is illustrated. 10 is a cross-sectional view taken along line XX in FIG. In FIG. 10, a discharge part, a detection container, and a supply / exhaust valve are illustrated.

  As shown in FIGS. 8 to 10, one end of the elastic member 41 </ b> A is attached to the rear support 33, and the other end of the elastic member 41 </ b> A is attached to the pressure plate 35. The elastic member 41 </ b> A expands and contracts according to the distance between the rear support 33 and the pressure plate 35. Here, the rear support 33 corresponds to the first mounting member described in the claims, and the pressure plate 35 corresponds to the second mounting member described in the claims. The rear support 33 may correspond to the second mounting member, and the pressure plate 35 may correspond to the first mounting member. The same applies to the embodiment shown in FIG.

  The elastic member 41 </ b> A may be formed in a cylindrical shape so as to surround the drive shaft 23 and the rotation shaft 24 in order to prevent the lubricating oil 42 from scattering. Here, the rotating shaft 24 corresponds to the first friction member described in the claims, and the drive shaft 23 corresponds to the second friction member described in the claims. The rotating shaft 24 may correspond to the second friction member, and the drive shaft 23 may correspond to the first friction member. The same applies to the embodiment shown in FIG.

  The telescopic member 41A may be, for example, a telescopic type, and includes a movable tubular portion 41Aa attached to the movable pressure plate 35 and a fixed tubular portion 41Ab attached to the fixed rear support 33. .

  The fixed cylindrical portion 41Ab may be fitted into the through hole of the rear support 33 from the rear and attached to the rear support 33 from the rear. Good workability. In this case, the rear support 33 may hold the bearing 38 (see FIG. 2) of the rotating shaft 24 through the fixed-side tubular portion 41Ab. In this embodiment, the bearing 38 is attached to the speed reducer 25 shown in FIG. Provided.

  A gap between the fixed-side tubular portion 41Ab and the rotary shaft 24 is closed with a seal 57A.

  The telescopic member 41 </ b> A forms a storage space 43 for storing the lubricating oil 42 around the drive shaft 23 and the rotation shaft 24 between the pressure plate 35 and the rear support 33. Lubricating oil 42 can be held between the drive shaft 23 and the rotary shaft 24.

  An oil storage tank 63 for storing the lubricating oil 42 leaking from the elastic member 41A may be disposed below the elastic member 41A. The oil storage tank 63 may be formed as a part of the base 31 or may be formed on the upper surface of the base 31. The oil storage tank 63 stores, for example, the lubricating oil 42 leaking from between the movable side tubular portion 41Aa and the fixed side tubular portion 41Ab.

  The pressure plate 35 is provided with a supply port 58 (see FIG. 9), and the rear support 33 is provided with a discharge port 68 (see FIG. 10). A supply unit 50 is connected to the supply port 58, and a discharge unit 60 is connected to the discharge port 68. The lubricating oil supplied from the supply port 58 passes through the storage space 43 and is discharged from the discharge port 68. The amount of heat that the lubricating oil 42 takes out is large, and the cooling efficiency is good.

  The lubricating oil 42 supplied from the supply port 58 may be supplied to the storage space 43 and discharged from the discharge port 68 after lubricating the bearings 36 and 37 of the drive shaft 23. Since the lubricating oil 42 having a relatively low temperature lubricates the bearings 36 and 37, overheating of the bearings 36 and 37 can be easily prevented.

  In the present embodiment, the bearing 38 shown in FIG. 2 is provided in the speed reducer 25. However, as described above, the rear support 33 holds the bearing 38 of the rotary shaft 24 via the fixed cylindrical portion 41Ab. 2, the flow of the lubricating oil 42 may be the same when the rear support 33 directly holds the bearing 38 of the rotating shaft 24. That is, the lubricating oil 42 may lubricate the bearing 38 of the rotating shaft 24 after lubricating the bearings 36 and 37 of the drive shaft 23. Unlike the bearing 38 of the rotating shaft 24, the bearings 36 and 37 of the drive shaft 23 receive a thrust load from the front screw 13. Since the drive shaft 23 and the rotary shaft 24 are spline-coupled, almost no thrust load is applied to the bearing 38 of the rear rotary shaft 24. Since the bearings 36 and 37 that receive a high thrust load are lubricated first, the bearings 36 and 37 are cooled by the lubricating oil 42 having a lower temperature than the case where they are lubricated later. Therefore, it is easy to prevent overheating of the bearings 36 and 37 that can become high temperature. The arrangement of the supply port 58 and the discharge port 68 may be reversed, and the supply port 58 may be provided on the rear support 33 and the discharge port 68 may be provided on the pressure plate 35. However, as described above, it is advantageous to prevent the bearings 36 and 37 from being overheated when the supply port 58 is disposed on the pressure plate 35 and the discharge port 68 is disposed on the rear support 33.

  As shown in FIG. 10, the rear support 33 may be provided with a detection container 49, a supply / exhaust valve 64, and a maintenance discharge port 69.

  The detection container 49 may be attached to the bracket 65 of the rear support 33. A pipe is provided between the detection container 49 and the rear support 33, and the detection space 48 and the storage space 43 communicate with each other through flow paths 47-1 and 47-2 of the pipe. The detection container 49 may have a transparent window 49a through which the liquid level of the lubricating oil 42 can be seen. The liquid level of the lubricating oil 42 in the detection space 48 corresponds to the liquid level of the lubricating oil 42 in the storage space 43.

  The air supply / exhaust valve 64 is attached to the upper part of the rear support 33, and performs air supply / exhaust according to the change in the liquid level of the lubricating oil 42, thereby suppressing the fluctuation of the atmospheric pressure in the storage space 43. The air supply / exhaust valve 64 exhausts air from the storage space 43 when the pressure in the storage space 43 is higher than the set pressure, and supplies air to the storage space 43 when the pressure in the storage space 43 is lower than the set pressure. . The air supply / exhaust valve 64 is constituted by an air breather, for example. A plurality of small air breathers may be attached. The width and height can be suppressed.

  The mounting position of the air supply / exhaust valve 64 is not limited to the upper part of the rear support 33, and may be any of the upper part of the rear support 33, the upper part of the telescopic member 41A, and the upper part of the pressure plate 35. Good.

  The maintenance discharge port 69 is disposed on the rear support 33 and discharges the lubricating oil 42 in the storage space 43 from below the discharge port 68 for adjusting the liquid level. Most of the lubricating oil 42 can be discharged, and maintenance work is easy. The maintenance discharge port 69 is closed during normal operation and opened during maintenance.

  The arrangement position of the discharge port 69 for maintenance is not limited to the rear support 33, and may be any of the rear support 33, the elastic member 41A, and the pressure plate 35, or a plurality of them.

  In this embodiment, the flow of the lubricating oil 42 in the storage space 43 formed around the drive shaft 23 and the rotary shaft 24 has been described. However, the storage space formed around the ball screw shaft 27a and the ball screw nut 27b. The flow of the lubricating oil 142 at 143 may be similar. The ball screw shaft 27a corresponds to the first friction member described in the claims, and the ball screw nut 27b corresponds to the second friction member described in the claims. The ball screw shaft 27a may correspond to the second friction member, and the ball screw nut 27b may correspond to the first friction member. The same applies to the embodiment shown in FIG.

  For example, the front support 32 is provided with a supply port, and the pressure plate 35 is provided with a discharge port. Here, the front support 32 corresponds to a first mounting member described in the claims, and the pressure plate 35 corresponds to a second mounting member described in the claims. The front support 32 may correspond to the second mounting member, and the pressure plate 35 may correspond to the first mounting member. The same applies to the embodiment shown in FIG.

  The lubricating oil 142 supplied from the supply port of the front support 32 may pass through the storage space 143 and be discharged from the discharge port of the pressure plate 35. The amount of heat that the lubricating oil 142 takes out is large, and the cooling efficiency is good. The lubricating oil 142 may lubricate the bearings 136 and 137 of the shaft portion 28 after lubricating the ball screw mechanism 27.

  When the arrangement of the ball screw mechanism 27 and the bearings 136 and 137 is reversed, the arrangement of the supply port and the discharge port may be reversed. That is, when the ball screw nut 27 b is attached to the pressure plate 35 and the bearings 136 and 137 are held by the front support 32, a supply port is provided in the pressure plate 35 and a discharge port is provided in the front support 32. Good. The lubricating oil 142 lubricates the bearings 136 and 137 after lubricating the ball screw mechanism 27.

  The lubricating oil 142 may lubricate the ball screw mechanism 27 after the bearings 136 and 137 are lubricated. The arrangement of the supply port and the discharge port may be appropriately set according to the type of friction member and the type of bearing.

  As mentioned above, although embodiment of the injection molding machine was described, this invention is not limited to the said embodiment, In the range of the summary of this invention described in the claim, various deformation | transformation and improvement are possible. Is possible.

  For example, the injection molding machine 10 of the above-described embodiment is a screw / inline type, but may be a screw / prepa type. In the screw / prepa type, the molding material melted in the plasticizing cylinder is supplied to the injection cylinder, and the molding material is injected into the mold apparatus 87 from the injection cylinder. Since the plasticizing cylinder and the injection cylinder are provided separately, the screw disposed in the plasticizing cylinder can be driven to rotate in the filling process or the pressure holding process.

  Moreover, although the telescopic members 41, 41A and 141 of the above embodiment are telescopic types, they may be telescopic, and may be, for example, bellows types.

  In the above embodiment, a storage space for storing lubricating oil is formed around the ball screw mechanism 27 that converts the rotational motion of the injection motor 16 into linear motion. However, the rotational motion of the mold clamping motor 96 is converted into linear motion. A storage space for storing lubricating oil may be formed around the ball screw mechanism 97. In this case, one end of the elastic member is attached to the toggle support 83, and the other end of the elastic member is attached to the cross head 91.

  Further, in the above embodiment, the space between the ball screw shaft 27a and the ball screw nut 27b is lubricated, but the space between the screw shaft and the nut that are screwed together without a ball may be lubricated.

DESCRIPTION OF SYMBOLS 10 Injection molding machine 11 Cylinder 12 Nozzle 13 Screw 14 Hopper 15 Metering motor 16 Injection motor 18 Controller 19 Output part 21 Shaft part 23 Drive shaft 23a Spline nut part 24 Rotating shaft 24a Spline shaft part 27 Ball screw mechanism 27a Ball screw shaft 27b Ball Screw nut 30 Injection frame 31 Base 32 Front support 33 Back support 34 Guide bar 35 Pressure plate 41 Telescopic member 41a Movable side cylindrical part 41b Fixed side cylindrical part 42 Lubricating oil 43 Storage space 50 Supply part 58 Supply port 60 Discharge part 68 Discharge port

Claims (7)

A first friction member;
A second friction member to which lubricating oil is supplied between the first friction member;
A telescopic member disposed around the first friction member and the second friction member;
A first attachment member to which one end of the elastic member is attached;
A second attachment member to which the other end of the elastic member is attached;
The position of the second mounting member relative to the first mounting member and the position of the second friction member relative to the first friction member are displaced in conjunction with each other,
The expansion and contraction member forms a storage space for storing the lubricating oil around the first friction member and the second friction member, and is formed at an interval between the first attachment member and the second attachment member. An injection molding machine that expands and contracts accordingly.   The injection molding machine of Claim 1 provided with the supply part which supplies the said lubricating oil to the said storage space.   The injection molding machine of Claim 1 or 2 provided with the discharge part which discharges | emits the said lubricating oil from the said storage space outside.   The injection molding machine of any one of Claims 1-3 provided with the detection part which detects the quantity of the said lubricating oil in the said storage space.   The injection molding machine of Claim 4 provided with the output part which outputs a warning based on the detection result of the said detection part.   The injection molding machine according to claim 4 or 5, further comprising a controller that controls an amount of the lubricating oil in the storage space based on a detection result of the detection unit. Of the first mounting member and the second mounting member, one is provided with the lubricating oil supply port, and the other is provided with the lubricating oil discharge port,
The injection molding machine according to any one of claims 1 to 6, wherein the lubricating oil supplied from the supply port passes through the storage space and is discharged from the discharge port.

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