TWI509183B - Pump equipment for lubricating oil - Google Patents

Description

Lubricating oil pump device

The present invention relates to a lubricating oil pump device for supplying lubricating oil such as butter or oil to various machines such as an injection molding machine or a lathe, and more particularly to a lubricating line for alternately pressurizing and depressurizing a pipe in a machine. Pump device for lubricating oil.

In general, for example, in a resin or metal injection molding machine, as shown in FIG. 8, a single piston that discharges lubricating oil and one corresponding piston are used to reciprocate by pressurization and decompression of lubricating oil. A conventional single dosing valve V having a discharge amount of 0.03 ml to 1.5 ml, which is discharged one time, is disposed in a plurality of points corresponding to the single dosing valve V via the lubrication line W, and is formed in a plurality of points. The lubricating oil pump unit Sa supplies the lubricating oil to the lubricating line W.

The single dosing valve V is actuated by pressurization and decompression of the lubricating oil, and must be decompressed in order to discharge the lubricating oil. Therefore, the lubricating oil pump device Sa capable of decompressing is used.

In the prior art, the pumping device for the lubricating oil is known, for example, from Patent Document 1 (JP-A-6-137489) or Patent Document 2 (Japanese Patent Publication No. 7-81676). The device of the lubricating oil.

As shown in FIG. 8, the lubricating oil pumping device Sa includes a plunger-type pump body 100 including a cylinder and a piston, and an electric motor 101 that can rotate forward and backward as a piston advance/retract movement regulator. The pump body 100 is driven while the electric motor 101 is rotating forward, and sucks the lubricating oil stored in the tank 102 and discharges it from the discharge port 104 through the discharge passage 103. Further, a pressure reducing path 105 is formed between the groove 102 and the discharge passage 103. A pressure reducing valve 106 that is driven by the electric motor 101 is interposed in the pressure reducing path 105. The pressure reducing valve 106 is closed when the electric motor 101 is rotated forward, and is opened when the electric motor 101 is reversed. Further, when the lubrication line W is connected to the discharge port 104, when the supply of the lubricating oil is supplied to the lubrication line W, the electric motor 101 is rotated forward, and the piston of the pump body 100 is moved forward and backward to pressurize the discharge port 104 side. On the other hand, when the supply of the lubricating oil to the lubricating line W is stopped, the electric motor 101 is reversed based on a signal from the pressure switch 107 or the like, and the pressure reducing valve 106 is opened to depressurize the discharge port side. 108 in Fig. 8 is a pressure relief valve.

[Advanced technical literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. Hei 6-137489

[Patent Document 2] Japanese Patent Publication No. 7-81676

However, the conventional lubricating oil pumping device Sa is a piston that drives the pump body 100 by one electric motor 101, and the pressure reducing valve 106 is actuated. In this point, although the efficiency is good, the pressure reducing valve is used. Since the 106 is separately provided from the cylinder and the piston of the pump body 100, the installation is increased in size, and the drive mechanism of the pressure reducing valve 106 is also complicated.

The present invention has been made in view of the above-described problems, and it is an object of the invention to provide a lubricating oil pump device which is capable of reducing the size of a reduced-pressure structure and miniaturizing the device and reducing the cost.

In the pump device for lubricating oil according to the present invention, the pump body includes a lubricating oil that is sucked into the tank, and a cylinder portion that is discharged from the outlet and moves the cylinder portion forward and backward. a piston and a regulator for moving the piston forward and backward. When the supply of lubricating oil is supplied to a lubrication line connected to the discharge port, the pump body pressurizes the discharge port side to stop lubricating oil to the lubrication line. When the supply is not supplied, the lubricating oil pump device that decompresses the discharge port side is characterized in that the piston can be moved to the first position where the lubricating oil is discharged, and is retracted from the first position to the suction. The second position of the lubricating oil moves further from the second position to the third position of the third position, and when the pump body is configured to move between the first position and the second position by the pump body The piston is closed, and when the piston retreats to the third position, the decompression path is opened by the piston.

According to this, when the supply of the lubricating oil is supplied to the lubrication line connected to the discharge port of the pump body, the piston is moved from the third position to the first position by the regulator, and then the first position is reached to move the piston backward. Then, after reaching the second position, the piston is entered again, and then reaches the first position to make the piston behind. Then, the second position is reached and the piston is moved in. Thus, the piston is reciprocated between the first position and the second position. At this time, since the pressure reducing path is closed by the piston, the lubricating oil stored in the groove is sucked by the piston by the reciprocating operation of the piston, and is discharged from the discharge port and supplied to the lubrication line. By supplying the lubricating oil, the lubricating oil is discharged from the valve provided in the lubricating line to supply oil. Further, when the lubricating oil is discharged from the valve, the piston is retracted toward the third position by the regulator and stopped. At this time, since the pressure reducing path is opened by the piston, the discharge port side is depressurized, and the lubrication line can prepare for the next oil supply.

According to the present device, since the pressure of the piston is increased and the pressure is reduced only when the piston is moved forward and backward by the regulator, the cylinder portion and the piston that suck and discharge the lubricating oil serve as the load reducing valve. Therefore, it is not necessary to separately provide a pressure reducing valve as in the related art, and since the driving mechanism may be a simple mechanism for moving the piston forward and backward by the regulator, the structure is also simple, and as a result, the device can be downsized and can be realized. Reduce costs.

More specifically, the pump device for lubricating oil according to the present invention includes: a block-shaped pump body; a cylinder portion; a piston; and a structure of a regulator that moves the piston forward and backward, the block-shaped pump body having a suction port a suction passage for sucking the lubricating oil stored in the tank and a discharge passage for discharging the sucked lubricating oil from the discharge port, wherein the cylinder portion is formed in the pump body, and is provided to communicate with the suction passage, and to introduce lubrication from the suction passage The inlet port of the oil communicates with the discharge passage, and the outlet for lubrication is led to the discharge passage, and the piston is inserted into the cylinder portion so as to be movable forward and backward, and is introduced from the above when the vehicle is retracted. The port sucks the lubricating oil, and when the oil is discharged from the outlet, the lubricating oil is supplied from the discharge port to the lubricating line connected to the discharge port, and the discharge passage is pressurized to stop the lubrication line. When the lubricating oil supply is not supplied, the lubricating oil pump device that depressurizes the discharge passage is characterized in that the piston is allowed to enter the first position where the lubricating oil is discharged, and is retracted from the first position to the suction. The second position of the lubricating oil moves further from the second position to the third position of the third position, and when the piston moves between the first position and the second position in the cylinder portion of the pump body When the piston is retracted to the third position, the opened first port and the second port form a first connection between the first port and the discharge passage in the pump body. a passage and a second passage connecting the second opening and the suction passage, and when the piston retreats to the third position, reaching the suction passage through the discharge passage, the first passage, the cylinder portion, and the second passage Path configuration under reduced pressure.

Further, if necessary, the actuator is driven and controlled to move the piston from the third position to the first position while the lubricating oil is being supplied, and between the first position and the second position. When the lubricant is not supplied, the drive control means for moving the piston to the third position and stopping is performed. Pressurization and decompression can be automatically performed by driving control means.

Further, if necessary, a first detecting unit that detects that the piston is located at the first position, a second detecting unit that detects that the piston is located at the second position, and a third detecting unit that detects that the piston is located at the third position, and the driving The control means controls and controls the regulator based on the signals from the start command signal, the first detecting unit, the second detecting unit, and the third detecting unit, and the stop command signal. Since the position of the piston is detected, the forward and backward movement of the piston is controlled, and the operation can be performed as sure.

In this case, the control of the regulator of the drive control means is effective to cause the piston to enter when the start command signal is output, and to retract the piston based on the detection by the first detecting unit, according to the second detection. The detection of the portion causes the piston to enter until the stop command signal is output, and causes the piston to reciprocate between the first position and the second position based on the detection by the first detecting unit and the second detecting unit, and outputs the stop command signal At this time, the piston is retracted toward the third position, and the piston is stopped in response to the detection of the third detecting unit.

Further, the first detecting unit, the second detecting unit, and the third detecting unit are configured by a Hall element that detects a magnet provided on the piston side, as needed. The detecting means can be constructed in a simple manner, and as long as this is possible, the structure can be simplified.

And, as needed, an electric motor capable of rotating the regulator forward and backward; a screw shaft that can be rotated forward and backward by the electric motor; and screwing with the screw shaft and contacting the piston by the screw The forward and reverse rotation of the shaft moves forward and backward, and the connecting member that moves the piston forward and backward moves. Since the screw shaft is used to force the piston to advance and retreat by the screw shaft, the piston can be operated accurately, and the lubricating oil can be supplied without being affected by the viscosity change of the lubricating oil.

Thus, the structure of the electric motor having the regulator can be rotated forward and backward is provided. In the following, it is effective as the following. In other words, the first detecting unit that detects the piston at the first position, the second detecting unit that detects the piston at the second position, and the third detecting unit that detects that the piston is located at the third position are provided, and the driving control is provided. The control of the regulator is such that when the start command signal is output, the electric motor is rotated forward to allow the piston to enter, and when the first detecting unit is detected, the electric motor is stopped for a predetermined stop time. After the predetermined stop time has elapsed, the electric motor is reversed to retract the piston, and when the second detecting unit is detected, the electric motor is stopped for a predetermined stop time, and after the predetermined stop time elapses, The electric motor rotates forward to cause the piston to enter, and the output of the stop command signal is based on the detection of the first detecting unit and the second detecting unit, and the electric motor is stopped for a predetermined rest time, and after that, the piston is rotated forward. Or reversing, and moving back and forth between the first position and the second position, and when the stop command signal is output, the electric horse is Reversed so that the piston is retracted to the third position, and stops the control piston 3 in accordance with the first detector detecting portion.

According to this configuration, when the electric motor is switched between the forward rotation and the reverse rotation, the electric motor is stopped for a predetermined rest time (for example, 0.1 to 1.0 second), so that the rapid rotation switching is not performed, so that the load of the motor can be reduced. , greatly improving life expectancy.

Further, if necessary, the inlet port and the outlet port of the cylinder portion are formed at the front end portion of the cylinder, and an inlet check valve that allows only suction is provided in the front position of the inlet port, and only the rear position of the outlet port is provided. The structure of the outlet check valve that allows the discharge. And on the way to the inlet port on the cylinder section When the situation is compared, since the negative pressure generated by pulling the piston acts on the introduction port immediately, it is not affected by the change in the viscosity of the lubricating oil, and the lubricating oil can be smoothly sucked.

According to the present invention, the piston can be moved to the first position where the lubricating oil is discharged, and is retracted from the first position to the second position where the lubricating oil is sucked, and further moved back from the second position to the third position of the third position. When the pump body is formed with the piston moving between the second position and the third position, the piston is closed, and when the piston retreats to the third position, the pressure reducing path is opened by the piston, so that only the regulator can be used. The forward and backward movement of the piston is performed to reduce the pressure when the supply and supply of the lubricating oil are stopped. Therefore, the cylinder portion and the piston that suck in and discharge the lubricating oil serve as the pressure reducing valve. Therefore, it is not necessary to separately provide a pressure reducing valve as in the past, and since the driving mechanism can also move the piston forward and backward by the actuator, the structure is also simple. As a result, the size of the device can be reduced, and the cost can be reduced.

[Formation for carrying out the invention]

Hereinafter, the lubricating oil pump device according to the embodiment of the present invention will be described in detail based on the drawing surface.

The pump device for lubricating oil according to the embodiment of the present invention is, for example, a lubrication system provided in a resin or metal injection molding machine. In the lubrication system, as shown in FIG. 1, a well-known single dosing valve V is disposed via a lubrication line W. At a plurality of points necessary for the injection molding machine, the lubricating oil is supplied to the lubricating line W from the lubricating oil pump device of the embodiment. The single dosing valve V is a single piston (not shown) that reciprocates by the pressurization and decompression of the lubricating oil, and discharges the lubricating oil, and one discharge port corresponding to the piston, and the discharge amount of one shot is 0.03ml~1.5ml or so.

As shown in FIG. 1 and FIG. 2, the basic structure of the lubricating oil pump device S of the embodiment is: a lubricating oil storage unit 1, a metal block-shaped pump body 10, a regulator 40, and a control unit. 70 is composed.

As shown in FIG. 1, the lubricating oil storage unit 1 includes a tank 2 for accommodating lubricating oil formed of butter, a tank mounting portion 3 provided on the upper side of the pump body 10, and a groove 2; and a cover-mounted love The cover 4 of the groove 2 of the groove mounting portion 3. The groove 2 is a resin-made kneading container that can expand and contract in the axial direction, and an external thread 5a is formed in the opening 5. The groove mounting portion 3 is formed with the external thread 5a of the opening portion 5 of the groove 2 screwed into the internally threaded portion 6 to be attached. Further, the groove attaching portion 3 is provided to be inserted inward from the opening portion 5 of the groove 2 to be attached by being twisted into the female screw portion 6, and guide the lubricating oil in the groove 2 to the suction port 11 of the pump body 10 to be described later. Catheter 7.

As shown in FIGS. 1 to 4 , the pump body 10 includes a suction passage 12 that sucks the lubricating oil stored in the tank 2 from the suction port 11 , and includes a discharge passage 14 that discharges the sucked lubricating oil from the discharge port 13 . Construction. The suction port 11 is opened at the upper side of the pump body 10, and communicates with the above-described duct 7. Further, the discharge port 13 is opened on the lower side surface of the pump body 10. Further, a lubrication line W is connected to the discharge port 13.

Further, in the pump body 10, the bottom end portion 15a is located on one side of the pump body 10. The surface 10a is provided with a cylinder portion 15 having an axis in the left-right direction. The front end portion 15b of the cylinder portion 15 is formed with an inlet port 16 that communicates with the suction passage 12, and introduces lubricating oil from the suction passage 12, and communicates with the discharge passage 14, and the outlet port 17 for lubricating oil is led out through the discharge passage 14. Further, the main body portion 15c constituting the cylinder portion 15 is formed of a cylindrical member and fitted to the hole 18 formed in the pump body 10.

An inlet check valve 19 that allows only suction is provided in the front position of the inlet port 16, and an outlet check valve 20 that allows only discharge is provided in the rear position of the outlet port 17.

The outlet check valve 20 is provided with a valve body 21 as shown in FIG. The valve body 21 is provided with a conical ladder-shaped metal head 23 formed at the tip end of the rod 22, and a rubber O-ring 24 that is inserted into the rod end 22 and connected to the bottom end of the head 23; The bottom end of 23 pushes the configuration of the pressing member 25 of the O-ring 24. Further, the outlet check valve 20 is provided with a metal sealing surface portion 26 that is provided on the outlet port 17 side of the cylinder portion 15, and the head 23 of the valve body 21 and the O-ring 24 abut against and separate from each other; When the rod 22 of the 21 is movably supported in the axial direction and has a guide portion 27 that is separated from the sealing surface portion 26 of the O-ring 24 and the O-ring 24, the guide portion 27 of the slit-shaped passage passage 27a through which the lubricating oil discharged from the outlet port 17 passes is provided. And a structure in which the coil spring 28 of the sealing surface portion 26 is pressed between the guide portion 27 and the pressing member 25 and the head 23 and the O-ring 24 are pressed.

According to the outlet check valve 20, since the metal head 23 abuts against the rubber-made O-ring 24 at the sealing surface portion 26, there is rubber in addition to the joint of the metal of the head 23 and the sealing surface portion 26 with each other. Since the manufactured O-ring 24 is joined to the metal sealing surface portion 26, the sealing can be ensured by such a joint, and the backflow can be surely suppressed when the lubricating oil from the inlet 16 is sucked. Sleek.

At the cylinder portion 15, the piston 30 is inserted into the forward and backward movement. When the piston 30 is retracted, the lubricating oil is sucked from the introduction port 16, and when it enters, the lubricating oil is discharged from the outlet port 17. The rear side portion 31 of the piston 30 protrudes outward from the bottom end 15a of the cylinder portion 15 (i.e., one side surface 10a of the pump body 10) even when the piston 30 enters, and is in contact with the regulator 40.

As shown in FIGS. 1 and 2, the regulator 40 moves the piston 30 forward and backward, and when the vehicle is retracted, the lubricating oil is introduced from the inlet 16 of the cylinder portion 15, and when it enters, the lubricating oil is led out from the outlet port 17 of the cylinder portion 15. Specifically, the regulator 40 is provided with an electric motor 41 that can rotate forward and backward. The electric motor 41 has a drive shaft 43 rotatable by a gear reduction mechanism 42, and is fixed to a leg portion 44 that is erected on one side surface 10a of the pump body 10 such that the axis of the drive shaft 43 is parallel to the axis of the piston 30. A coaxial screw shaft 45 is extended from the drive shaft 43 of the electric motor 41. The front end portion of the screw shaft 45 is rotatably supported by a side surface 10a of the pump body 10 by a bearing 46. Further, the adjuster 40 is provided with an associated member 47 that is screwed to the screw shaft 45 and fixed to the rear side portion 31 of the piston 30. The contact member 47 is slidably supported by the two guide shafts 48, and the piston 30 moves forward and backward by the forward and reverse rotation of the screw shaft 45. By the forward and backward movement of the piston 30, lubricating oil is supplied to the lubrication line W connected to the discharge port 13, and when the lubricating oil is supplied, the discharge port 13 side is pressurized. Reference numeral 49 in the figure is a cover covering the pump body 10 and the regulator 40.

Further, the piston 30 is at a first position P1 (Fig. 6 (b1) (b2), Fig. 7 (d1) (d2))) that can enter the entry end of the tip end 32 of the piston 30 that discharges the lubricating oil, and from the The first position P1 is retracted to the second position P2 (FIG. 2, FIG. 7 (c1) (c2)) for attracting the lubricating oil, and further retracted from the second position P2 to the third position P3 (FIG. 1, FIG. 3, FIG. 6). The three positions of (a1) (a2)) move. Further, when the pump body 10 is formed to move between the first position P1 and the second position P2, the piston 30 is closed by the piston 30, and when the piston 30 is retracted to the third position P3, the pressure reducing path 50 opened by the piston 30 is provided. . Thereby, when the supply of the lubricating oil to the lubricating line W is stopped, the piston 30 can be retracted to the third position P3, and the discharge port 13 side can be depressurized.

More specifically, as shown in FIGS. 1 to 3, the first port 51 and the second port 52 are formed in the cylinder portion 15 of the pump body 10. The first port 51 and the second port 52 are closed by the piston 30 when the piston 30 moves between the first position P1 and the second position P2, and are opened when the piston 30 retreats to the third position P3. . Further, the pump body 10 has a first passage 53 that connects the first port 51 and the discharge passage 14, and a second passage 54 that connects the second port 52 and the suction passage 12. Thereby, when the piston 30 retreats to the third position P3, the pressure reducing path 50 that reaches the suction passage 12 through the discharge passage 14, the first passage 53, the cylinder portion 15, and the second passage 54 is formed.

Further, as shown in FIG. 2, FIG. 6, and FIG. 7, the apparatus S includes a first detecting unit K1 in which the detecting piston 30 is at the first position P1, and a second detecting in which the detecting piston 30 is in the second position P2. The portion K2; and the third detecting portion K3 that detects the piston 30 at the third position P3. The contact member 47 of the adjuster 40 is provided with a magnet 60 (Fig. 2(a)), and the first detecting portion K1, the second detecting portion K2, and the third detecting portion K3 are detected by the magnet 60 provided in the contact member 47. The Hall element 61 is constructed. A rod-shaped support member 62 extending in the traveling direction of the piston 30 is fixed to the pump body 10, and the hall elements 61 are sequentially mounted at predetermined positions of the support member 62.

The control unit 70 (FIG. 1) is provided with a drive control means for driving the control adjuster 40. The drive control means drives the electric motor 41 of the control adjuster 40 based on the signals from the start command signal, the detection signals of the first detecting unit K1, the detecting unit K2 and the third detecting unit K3, and the stop command signal, so that the piston 30 is driven. When the lubricating oil is supplied, it moves from the third position P3 to the first position P1, and reciprocates between the first position P1 and the second position P2, and when the lubricating oil is not supplied, the piston 30 is moved to the third position. P3 and stop.

In detail, the control of the electric motor 41 of the regulator 40 by the drive control means is realized by the function of the CPU or the like. When the start command signal is output, the power is turned on, the electric motor 41 is rotated forward, and the piston 30 is entered. When the first detecting unit K1 is detected, the electric motor 41 is stopped for a predetermined stop time, and after the predetermined stop time, the electric motor 41 is reversed to retract the piston 30, and when the second detecting unit K2 is detected, the electric motor is turned off. The motor 41 stops the predetermined stop time, and after the predetermined stop time, the electric motor 41 is rotated forward, the piston 30 is entered, and the stop command signal is output, and the electric power is detected based on the detection of the first detecting unit K1 and the second detecting unit K2. The motor 41 stops the predetermined stop time, and after that, performs forward or reverse rotation to reciprocate the piston 30 between the first position P1 and the second position P2, and when the stop command signal is output, the electric motor 41 is reversed. The piston 30 is retracted to the third position P3, and based on the detection by the third detecting unit K3, control is performed to turn off the power supply and stop the piston 30.

The predetermined stop time of the electric motor 41 is set, for example, to 0.1 to 1.0 second. In the embodiment, the setting is set to 0.2 seconds.

As a result, when the electric motor 41 is switched between the forward rotation and the reverse rotation, the electric motor 41 is stopped for a predetermined stop time, so that the rapid rotation switching is not performed, so that the load of the motor is reduced, and the life can be greatly improved.

The start command signal can also use, for example, a signal from the timing of setting the intermittent time of the device, or any signal based on a signal such as a count signal or a load current from a mechanical side on which the device is mounted.

The stop command signal is, for example, a signal that is detected when the load current of the electric motor 41 is detected and reaches a predetermined load current value. The load current of the electric motor 41 is changed in accordance with the pressure of the lubrication line W. When the operation of the valve V is completed, the pressure of the lubricating line W rises and the load current rises. Therefore, it is effective to detect the predetermined load current at this time and transmit the stop command signal. Further, for example, the pressure of the lubrication line W is detected by a pressure detector or the like, and when a predetermined pressure is reached, it is also effective to issue a stop command signal.

Moreover, the control unit 70 is provided with a function of monitoring the remaining amount of the lubricating oil in the tank 2, and when the predetermined amount or less, the electric motor 41 is stopped and a warning is issued. In addition to this, an appropriate control function such as a function of performing manual operation of the electric motor 41 can be provided.

Therefore, the lubrication system of the lubricating oil pump device S using the embodiment of the present embodiment is operated as follows. Description will be made using the flowchart shown in FIG. 5 and the actuation diagrams shown in FIGS. 6 and 7.

When the control unit 70 outputs the start command signal, the power supply (S1) is input, the control program is read, and control is started (S2). First, when the remaining amount of the lubricating oil is detected (S3), and the remaining amount is less than or equal to a predetermined amount (below the standard value of the lubricating oil (butter)) (S3, YES), the electric motor 41 is stopped (S4), and a warning signal is sent (lubrication) Oil (butter) is under signal) (S5) Lights up the warning light, etc.

When the remaining amount of the lubricating oil is not less than the predetermined amount (the lubricating oil (butter) is not below the standard value) (S3, NO), the electric motor 41 is rotated forward (S6). As a result, as shown in Fig. 6 (a1) (a2), the piston 15 enters from the third position P3 to the first position P1. At this time, the control unit 70 detects the load current of the electric motor 41, monitors whether it is equal to or higher than the predetermined load current (S7), and determines that it is not above the predetermined load current (S7, NO) as shown in Fig. 6 (b1) (b2). As shown in the figure, the electric motor 41 is rotated forward and the piston 30 is introduced until the detection of the first detecting unit K1. When the detection of the first detecting unit K1 is performed (S8), the electric motor 41 is stopped for a predetermined time (in the embodiment, 0.2 second) (S9), and the electric motor 41 is reversed (S10), as shown in Fig. 7 ( As shown in (c2), until the detection of the second detecting unit K2 is performed, the electric motor 41 is reversed to retract the piston 30. After that, when the second detecting unit K2 detects (S11), the electric motor 41 is stopped for a predetermined stop time (in the embodiment, 0.2 second) (S12), and the remaining amount of the lubricating oil is detected again (S3). As shown in Fig. 7 (c1) and (c2), the electric motor 41 is rotated forward (S6). Next, it is determined whether or not the load current of the electric motor 41 is equal to or higher than the predetermined load current (S7). When it is determined that the load current is equal to or higher than the predetermined load current, the electric motor 41 is rotated forward (S8, S9) in the same manner as described above, and then the electric motor is driven. 41 reverses (S10, S11, S12,) and repeats such control.

In other words, when the supply of lubricating oil is supplied to the lubrication line W connected to the discharge port 13 of the pump body 10, the piston 30 is moved from the third position P3 by the regulator 40 (Fig. 1, Fig. 3). 6(a1)(a2)) enters the first position P1 (Fig. 6 (b1) (b2)), and then reaches the first position P1 (Fig. 6 (b1) (b2)), causing the piston 30 to retreat. Then, when the second position P2 is reached (Fig. 2, Fig. 7 (c1) (c2)), the piston 30 is again entered, and when the first position P1 is reached (Fig. 7 (d1) (d2)), the piston 30 is caused. When the second position P2 (Fig. 2, Fig. 7 (c1) (c2)) is reached, the piston 30 is again moved, so that the piston 30 reciprocates between the first position P1 and the second position P2. . At this time, as shown in FIG. 2, since the pressure reducing path 50 is closed by the piston 30, the lubricating oil stored in the groove 2 is sucked by the piston 30 by the reciprocation of the piston 30. The discharge port 13 is discharged and supplied to the lubrication line W. By the supply of the lubricating oil, the lubricating oil is discharged from the valve V provided in the lubricating line W to supply oil.

Further, when the lubricating oil is discharged from the valve V, the pressure of the lubricating line W rises and the load current rises, so that a predetermined load current can be detected at this time. In other words, the control unit 70 detects the load current of the electric motor 41 and monitors whether it is equal to or higher than the predetermined load current (S7), and when it is determined that the load current is equal to or higher (S7, YES), as shown in Figs. 1, 3, and 6 (a1) (a2), until the detection of the third detecting unit K3, the electric motor 41 is reversed (S13) to retract the piston 30. When the third detecting unit K3 detects (S14), the stop command signal of the electric motor 41 is output (S15), and the power (S16) of the electric motor 41 is cut off to enter the stop state.

At this time, as shown in FIG. 1, FIG. 3, and FIG. 6 (a1) (a2), since the pressure reducing path 50 is opened by the piston 30, the discharge port 13 side is decompressed, and the lubrication line W can be prepared. The next oil supply. It is in the standby state until there is output of the next start command signal. Further, if there is an initial command signal, the operation is performed in the same manner as described above. That is, the lubricating oil can be supplied intermittently.

In the pumping device S for lubricating oil of the embodiment, since the piston 30 is moved forward and backward by the regulator 40, the pressure can be reduced when the supply and supply of the lubricating oil are stopped, so that the lubricating oil is sucked and discharged. Since the cylinder portion 15 and the piston 30 serve to take up the pressure reducing valve, it is not necessary to separately provide a pressure reducing valve as in the related art, and the actuator 40 can also move the piston 30 forward and backward by the driving mechanism. It is also simple, and therefore, the size of the device can be reduced, and the cost can be reduced.

Further, in the operation of the piston 30, the first detecting unit K1, the second detecting unit K2, and the third detecting unit K3 detect the position of the piston 30, thereby controlling the forward and backward movement of the piston 30, so that the movement can be surely performed. . In this case, since the first detecting unit K1, the second detecting unit K2, and the third detecting unit K3 are constituted by the hall element 61 that detects the magnet 60 provided on the side of the piston 30, the detecting means can be configured by a simple means. This simplifies the construction.

Further, the adjuster 40 is provided with a screw shaft 45 that is rotated forward and backward by the electric motor 41 that can be rotated forward and backward. Since the rotation of the screw shaft 45 is transmitted to the piston 30 via the communication member 47, the piston can be forced. Since the movement of the piston 30 is performed, the operation of the piston 30 can be surely performed, and the supply of the lubricating oil can be surely performed without being affected by the change in the viscosity of the lubricating oil.

Further, since the introduction port 16 and the outlet port 17 of the cylinder portion 15 are formed in the front end portion 15b of the cylinder portion 15, the piston 16 is pulled in the middle of the cylinder portion 15 as compared with the case where the inlet port 16 is provided in the cylinder portion 15. The negative pressure generated by 30 acts immediately on the introduction port 16, so that it is not affected by the change in the viscosity of the lubricating oil, and the lubricating oil can be smoothly sucked.

Further, the lubricating oil pump device S of the above-described embodiment has a structure in which the regulator 40 is provided with the electric motor 41 and the screw shaft 45. However, the present invention is not limited thereto, and a cylinder device such as an air cylinder may be used. If you have other organizations, you can change them appropriately.

Further, in the lubricating oil pump device S of the embodiment, the first detecting unit K1, the second detecting unit K2, and the third detecting unit K3 are Halls that detect the magnet 60 provided on the side of the connecting member 47. Although the element 61 is configured, the configuration is not limited thereto, and a configuration such as a limit switch or a photo sensor may be used, and may be appropriately changed.

Further, the lubricating oil to be used is not limited to the above-mentioned butter, and the oil is also suitable. Further, the lubricating oil pump device S of the above-described embodiment is not limited to the injection molding machine, and is of course applicable to other various mechanical lubrication systems installed on a lathe or the like.

The embodiments of the present invention and the like are described in detail above, but the embodiments of the present invention may be modified in many ways without departing from the spirit and effect of the invention. Accordingly, many such modifications are intended to be included within the scope of the present invention.

The contents of the documents described in this specification are all incorporated herein by reference.

S‧‧‧Lubricating pump device

1‧‧‧Lubricant Storage Department

2‧‧‧Slots of lubricating oil

4‧‧‧ cover

5‧‧‧ openings

5a‧‧‧ external thread

3‧‧‧Slot installation department

11‧‧‧Inhalation

12‧‧‧Inhalation pathway

19‧‧‧Import check valve

16‧‧‧Import

17‧‧‧Export

20‧‧‧Export check valve

14‧‧‧Spout

10‧‧‧ pump body

13‧‧‧Exporting

50‧‧‧Decompression path

51‧‧‧1st port

15‧‧‧Cylinder Department

10a‧‧‧One side of the pump body 10

46‧‧‧ bearing

45‧‧‧ Screw shaft

44‧‧‧foot

42‧‧‧ Gear reduction mechanism

43‧‧‧Drive shaft

40‧‧‧Regulator

41‧‧‧Electric motor

49‧‧‧ cover

47‧‧‧Contact components

70‧‧‧Control Department

7‧‧‧ catheter

6‧‧‧Threaded Department

54‧‧‧2nd pathway

52‧‧‧2nd port

30‧‧‧Piston

P3‧‧‧3rd position

31‧‧‧ rear side

W‧‧‧Lubrication line

V‧‧‧ single dosing valve

30‧‧‧Piston

P2‧‧‧2nd position

53‧‧‧1st pathway

61‧‧‧Horse components

48‧‧‧Support members

60‧‧‧ magnet

15c‧‧‧ Body Department

62‧‧‧Support members

31‧‧‧ rear side

18‧‧‧ hole

15b‧‧‧ front end

32‧‧‧ front end

21‧‧‧ valve body

23‧‧‧ head

24‧‧‧O-ring

25‧‧‧ Pushing members

20‧‧‧Export check valve

26‧‧‧ Sealing the face

22‧‧‧ pole

28‧‧‧ coil spring

27a‧‧‧passage

27‧‧‧ Guidance Department

K3‧‧‧3rd Detection Department

K2‧‧‧2nd Inspection Department

K1‧‧‧1st detection department

P1‧‧‧1st position

102‧‧‧ slots

105‧‧‧Decompression path

Sa‧‧‧Lubricating pump device

106‧‧‧Reducing valve

101‧‧‧Electric motor

100‧‧‧Plunger type pump body

108‧‧‧Relief valve

107‧‧‧ Pressure switch

103‧‧‧Spout

104‧‧‧Export

15a‧‧‧ bottom

Fig. 1 is a front cross-sectional view showing a pump device for lubricating oil according to an embodiment of the present invention.

[ Fig. 2] A pump device for lubricating oil according to an embodiment of the present invention, wherein (a) is a plan view of an important part, and (b) is a front view of an important part.

3 is a cross-sectional view showing a structure of a pressure reducing path formed in a cylinder portion of a pump device for lubricating oil according to an embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view showing the structure of the outlet check valve together with the configuration of the discharge path and the pressure reduction path, in the pump device for lubricating oil according to the embodiment of the present invention.

Fig. 5 is a flowchart showing the control of the control unit of the lubricating oil pump device according to the embodiment of the present invention.

Fig. 6 is a view showing the operation of the lubricating oil pump device according to the embodiment of the present invention.

Fig. 7 is a view showing the operation of the lubricating oil pump device according to the embodiment of the present invention.

Fig. 8 is a view showing an example of a conventional pump device for lubricating oil.

S‧‧‧Lubricating pump device

1‧‧‧Lubricant Storage Department

2‧‧‧Slots of lubricating oil

3‧‧‧Slot installation department

4‧‧‧ cover

5‧‧‧ openings

5a‧‧‧ external thread

6‧‧‧Threaded Department

7‧‧‧ catheter

70‧‧‧Control Department

54‧‧‧2nd pathway

52‧‧‧2nd port

30‧‧‧Piston

P3‧‧‧3rd position

47‧‧‧Contact components

49‧‧‧ cover

41‧‧‧Electric motor

40‧‧‧Regulator

43‧‧‧Drive shaft

42‧‧‧ Gear reduction mechanism

31‧‧‧ rear side

44‧‧‧foot

V‧‧‧ single dosing valve

45‧‧‧ Screw shaft

46‧‧‧ bearing

10a‧‧‧One side of the pump body 10

15‧‧‧Cylinder Department

51‧‧‧1st port

53‧‧‧1st pathway

50‧‧‧Decompression path

13‧‧‧Exporting

10‧‧‧ pump body

14‧‧‧Spout

20‧‧‧Export check valve

17‧‧‧Export

16‧‧‧Import

19‧‧‧Import check valve

12‧‧‧Inhalation pathway

11‧‧‧Inhalation

W‧‧‧Lubrication line

Claims (9)

A pump device for lubricating oil, comprising: a pump body that includes a lubricating oil that is sucked into a tank, a cylinder portion that is discharged from the outlet port, and a piston that moves the cylinder portion forward and backward; and moves the piston forward and backward When the regulator supplies the supply of the lubricating oil to the lubrication line connected to the discharge port, when the discharge port side is pressurized and the supply of the lubricating oil to the lubrication line is stopped, the discharge port side is opened. A pump device for lubricating oil that is depressurized, characterized in that the piston is allowed to enter a first position where the lubricating oil is discharged, and is retracted from the first position to a second position at which the lubricating oil is sucked, and from the second position. Further moving back to the three positions of the third position, and the pump body is formed, when the piston moves between the first position and the second position, the piston is closed, and when the piston retreats to the In the third position, the decompression path opened by the piston. A pump device for lubricating oil includes a block-shaped pump body, a cylinder portion, a piston, and a regulator for moving the piston forward and backward. The block-shaped pump body is provided with a suction from the suction port and stored in the tank. a suction passage of the lubricating oil and a discharge passage for discharging the sucked lubricating oil from the discharge port, wherein the cylinder portion is formed in the pump body, and includes an inlet that communicates with the suction passage and introduces lubricating oil from the suction passage The discharge passage communicates with the discharge passage, and the discharge port of the lubricating oil is discharged to the discharge passage. The piston is inserted into the cylinder portion so as to be movable forward and backward. When the vehicle is retracted, the lubricating oil is sucked from the introduction port, and when entering, the lubricating oil is discharged from the outlet. When a supply of lubricating oil is supplied from the discharge port to the lubrication line connected to the discharge port, When the discharge passage is pressed to stop the supply of the lubricating oil to the lubrication line, the lubricating oil pump device that depressurizes the discharge passage is characterized in that the piston can enter the first discharge of the lubricating oil. Positioning and retreating from the first position to the second position for attracting the lubricating oil, moving from the second position to the third position further retreating to the third position, and forming the piston in the cylinder portion of the pump body When the piston is closed between the first position and the second position, when the piston is retracted to the third position, the opened first port and the second port are connected to the pump body. The first port and the first passage of the discharge passage and the second passage connecting the second port and the suction passage, and when the piston retreats to the third position, the discharge passage and the first passage pass through the discharge passage and the first passage. The cylinder portion and the second passage reach a pressure reducing path of the suction passage. The pump device for lubricating oil according to the second aspect of the invention, comprising: driving and controlling the regulator to move the piston from the third position to the first position while the lubricating oil is being supplied; The drive control means that moves between the first position and the second position and moves the piston to the third position and stops when the lubricating oil is not supplied. The pump device for lubricating oil according to the third aspect of the invention, wherein the first detecting unit that detects the piston at the first position, the second detecting unit that detects the piston at the second position, and the piston are detected. The third detecting unit located at the third position, the driving control means is based on the start command signal, the first detecting unit, the second detecting unit, and the third The detection signal of the detecting unit and the signals of the stop command signal drive and control the above regulator. The pump device for lubricating oil according to claim 4, wherein the control of the regulator by the drive control means is to cause the piston to enter when the start command signal is output, and according to the first detecting unit The detection causes the piston to retreat, and the piston enters until the stop command signal is output based on the detection by the second detecting unit, and the piston is detected in the first position and the second according to the detection by the first detecting unit and the second detecting unit. When the position is shifted back and forth, when the stop command signal is output, the piston is retracted toward the third position, and the piston is stopped in response to the detection by the third detecting unit. The pump device for lubricating oil according to the fourth aspect of the invention, wherein the first detecting unit, the second detecting unit, and the third detecting unit are Halls for detecting a magnet provided on the piston side. Component composition. The pump device for lubricating oil according to any one of claims 3 to 5, wherein the pump is an electric motor that can rotate the regulator forward and backward; and the electric motor is rotated forward and backward. a screw shaft; and an associated member that is screwed into the screw shaft and is in contact with the piston, and moves forward and backward by the forward and reverse rotation of the screw shaft to move the piston forward and backward. The pump device for lubricating oil according to claim 7, wherein the first detecting unit that detects the piston at the first position, the second detecting unit that detects the piston at the second position, and the piston are detected. The third detecting unit located at the third position, the drive control means For the control of the regulator, when the start command signal is output, the electric motor is rotated forward to allow the piston to enter, and when the first detecting unit is detected, the electric motor is stopped for a predetermined stop time. After the predetermined stop time, the electric motor is reversed to retract the piston, and when the second detecting unit is detected, the electric motor is stopped for a predetermined rest time, and after the predetermined stop time elapses, the electric motor is turned on. The motor rotates forward to cause the piston to enter, and the output of the stop command signal is based on the detection of the first detecting unit and the second detecting unit, and the electric motor is stopped for a predetermined rest time, and after that, the piston is rotated forward or Reversed and reciprocating between the first position and the second position. When the stop command signal is output, the electric motor is reversed, and the piston is retracted to the third position, and the third detecting unit is retracted according to the third detecting unit. The detection stops the control of the above piston. The pump device for lubricating oil according to any one of the invention, wherein the inlet port and the outlet port of the cylinder portion are formed at a front end portion of the cylinder, before the introduction port An inlet check valve that allows only suction is provided, and an outlet check valve that allows only discharge is provided in the rear position of the above-mentioned outlet.