JP4796894B2 - Hydraulic device - Google Patents

Description

  The present invention relates to a hydraulic apparatus that boosts hydraulic oil discharged from a hydraulic pump that is rotationally driven by an electric motor and supplies the hydraulic oil to an actuator side.

This type of hydraulic equipment includes a hydraulic pump (hydraulic power source), an electric motor, a tank, a pressure intensifier (intensification cylinder), etc., and a pressure intensifier is branched and connected to a line connecting the hydraulic pump and the actuator (clamp cylinder). Yes. When the workpiece is clamped by the actuator, the hydraulic oil filled in the pressure intensifier is increased from the hydraulic pump by the pressure intensifier, and this increased hydraulic oil is supplied to the actuator, and clamping is performed only by the hydraulic oil from the pressure intensifier. Since there is no need to supply hydraulic oil from the hydraulic pump, the hydraulic pump can be stopped to save energy.
JP 2002-174201 A

  However, in such a conventional hydraulic device, since the pressure intensifier is provided by branching and connecting to the line connecting the hydraulic device and the actuator, the pressure intensifier has to be specially arranged, resulting in a problem that the entire device becomes large. was there.

  An object of the present invention is to provide a hydraulic apparatus capable of integrating the hydraulic pump, the electric motor, the tank, and the pressure intensifier to make the entire apparatus compact.

In order to achieve this problem, the present invention has taken the following measures. That is,
It is filled with a tank that stores hydraulic oil, an electric motor that rotates the hydraulic pump, a hydraulic pump that is driven by the electric motor to suck and discharge the stored hydraulic oil in the tank, and a hydraulic oil that is discharged from the hydraulic pump. The pressure booster is equipped with a pressure booster that boosts and discharges the filled hydraulic oil. The pressure booster is inserted into the cylinder so as to be slidable in the axial direction, and one end of the cylinder penetrates one end of the cylinder in a liquid-tight manner. A piston rod that protrudes to the outside, and a compressed air chamber that introduces compressed air into the other end of the cylinder that faces the one end that protrudes the piston rod of the piston is defined and one end of the piston A hydraulic oil chamber filled with hydraulic oil is defined between the piston rod outer periphery and the cylinder inner periphery, and the hydraulic oil in the hydraulic oil chamber is increased by the action of the compressed air introduced into the compressed air chamber on the piston. The pressure receiving area on the hydraulic oil chamber side of the piston is smaller than the pressure receiving area on the compressed air chamber side so that the piston rod can be discharged. That is, a hydraulic device characterized in that it can accommodate either an electric motor or a tank that stores hydraulic oil therein.

  In this case, the electric motor and the tank are connected in a vertical direction with a flange member interposed therebetween, and the intensifier is arranged in a vertical direction in which the piston rod protrudes upward, and the electric motor or the tank is disposed in the concave portion of the piston rod. The flange member is disposed above the pressure intensifier so as to accommodate either one of the tanks, and the protruding end surface of the piston rod comes into contact with the flange member by the axial movement of the piston rod. You may have a stop part which controls the movement of. The hydraulic pump is housed in the tank, the electric motor and the tank are connected in the vertical direction with the electric motor facing down, and the pressure intensifier is arranged in the vertical direction protruding the piston rod upward The electric motor may be accommodated in the recess.

  As described above in detail, the invention described in claim 1 is a motor having a bottom that has a recess formed in a protruding end surface of a piston rod that protrudes to the outside of a pressure intensifier, a hydraulic pump that rotates a hydraulic pump, or a hydraulic oil that is provided inside. Either one of the tanks for storing can be accommodated. For this reason, the piston rod protruding to the outside of the pressure intensifier can secure a space open to the outside so that the electric motor or tank can be accommodated, so that the electric motor or tank is not affected by the axial movement of the piston rod. Any one of the above can be arranged with the piston rod of the pressure intensifier, so that the entire apparatus can be made compact.

  In addition to the effect of the invention described in claim 1, the invention described in claim 2 connects the electric motor and the tank in the vertical direction with a flange member interposed therebetween, and the intensifier projects the piston rod upward. A flange member is arranged above the pressure intensifier so that either the electric motor or the tank can be accommodated in the concave portion of the piston rod, and the protruding end surface of the piston rod is moved to the flange member in the axial direction of the piston rod. Has a stop portion that contacts and restricts the movement of the piston rod. For this reason, the projecting end surface of the piston rod is a flange member due to the axial movement of the piston and piston rod that pressurizes and discharges the hydraulic oil in the hydraulic oil chamber by the action of the compressed air introduced into the compressed air chamber of the pressure intensifier on the piston. Since the piston rod can be stopped by coming into contact with the stopper, the electric motor or tank accommodated in the recess can be prevented from colliding with the bottom surface of the recess, and damage to the piston rod and the electric motor or tank can be prevented well.

  In addition to the effect of the invention described in claim 1 or 2, the invention described in claim 3 connects the electric motor and the tank in the vertical direction with the electric motor downward, and the pressure intensifier moves the piston rod upward. It arrange | positions in the vertical direction which protrudes in, and can accommodate an electric motor in a recessed part. For this reason, even if the piston rod of the pressure intensifier moves in the axial direction, the tank can be prevented from being shielded from the outside. Therefore, by forming the tank with a permeable material, the amount of hydraulic oil stored in the tank, the hydraulic oil As a result, the operator can easily visually recognize from the outside the amount of dirt, the amount of foreign matter (contamination) mixed in the hydraulic oil, and the like, and an abnormality can be easily found.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1 and FIG. 2, reference numeral 1 denotes a tank that stores hydraulic oil therein, and a tubular member 3 formed of a permeable resin material is placed on and fixed to the upper surface of the flange member 2, and an upper portion of the tubular member 3. The opening is closed by a disk-shaped upper plate 5 that is detachable by bolts 4. Reference numeral 6 denotes an electric motor that rotationally drives the hydraulic pump 7. The electric motor 6 is mounted on the lower surface of the flange member 2 in the vertical direction with the drive shaft 6 </ b> A facing upward. I'm disposing. The hydraulic pump 7 is immersed in the stored hydraulic oil inside the tank 1, is attached to the upper surface of the flange member 2 with the rotary shaft 7 </ b> A downward, and the rotary shaft 7 </ b> A is received in the through hole 8 to drive the drive shaft 6 </ b> A of the electric motor 6. The stored hydraulic oil in the tank 1 is sucked from the suction pipe 9 and discharged by the rotational drive by the electric motor 6. Reference numeral 10 denotes a discharge passage through which hydraulic oil discharged from the hydraulic pump 7 flows, and is formed in the flange member 2. Reference numeral 11 denotes a check valve that prevents the reverse flow of hydraulic oil discharged from the hydraulic pump 7 and is provided in the discharge passage 10 and provided inside the flange member 2. Reference numeral 12 denotes a return flow path through which hydraulic oil returning to the inside of the tank 1 flows from hydraulic cylinders 13A, 13B, and 13C as actuators, and is formed in the flange member 2. Reference numeral 13 denotes a return pipe immersed in the stored hydraulic oil of the tank 1, which is erected on the upper surface of the flange member 2 and connected to the return flow path 12. 14 is a safety valve for setting an upper limit of the pressure of the hydraulic oil discharged from the pump 7, and is provided on the manifold arrangement member 30 described later in detail.

A pressure booster 15 is filled with hydraulic oil discharged from the hydraulic pump 7 and pressurizes and discharges the filled hydraulic oil. The lower cover member 20 is fixed to the lower end of the cylinder tube 19 arranged in the vertical direction and the cylinder tube. An upper lid member 22 is fixed to the upper end of the cylinder 19 via a flow path forming member 21 to form a cylinder 23, and a piston 24 is slidably inserted into the cylinder 23 in the vertical axis direction. The piston rod 16 is integrally formed, and the piston rod 16 is disposed in a vertical direction that penetrates the upper lid member 22 in a liquid-tight manner and protrudes upward. Above the intensifier 15, the flange member 2 having the electric motor 6 attached to the lower surface is disposed, and the flange member 2 and the intensifier 15 are coupled by four tie rods 18 through a hollow cylindrical tube member 17. . The piston rod 16 and the piston 24 of the intensifier 15 have a hollow cylindrical shape, and one end side in the axial direction located inside the cylinder 23 is closed with a closing member 24A, so that the protruding end surface protruding outside the piston rod 16 is provided. A recess 16 </ b> A at the bottom is formed as a recess, and the recess 16 </ b> A is provided in a size that can accommodate the electric motor 6. The flange member 2 has a stopper 2 </ b> A on the lower surface for restricting the movement of the piston rod 16 by abutment of the protruding end surface of the piston rod 16 by the upward movement of the piston rod 16 .

  A hydraulic oil chamber 25 is filled with hydraulic oil discharged from the hydraulic pump 7. A partition is formed on one end side of the piston 24 between the outer periphery of the piston rod 16 and the inner periphery of the cylinder tube 19, and is formed in the flow path forming member 21. The flow path 26, the flow path 27 drilled in the upper lid member 22, and the connection member 28 connecting the flange member 2 and the upper lid member 22 are connected to the discharge flow path 10 via the flow path 29 drilled. Yes. Further, the hydraulic oil chamber 25 includes a flow path 31 formed in the manifold arrangement member 30 coupled to the side surface of the flow path forming member 21 from the flow path 26, and a flow path provided in the manifold 32 provided upright on the manifold arrangement member 30. 33, and a plurality of electromagnetic switching valves 34A, 34B, 34C, 34D, 34E, and 34F are branched and connected to the flow path 33 in parallel. The electromagnetic switching valves 34A to 34F are attached to the manifold 32, connected to the hydraulic cylinders 13A, 13B, 13C... By piping, and supplied to the hydraulic cylinders 13A, 13B, 13C. The flow direction of hydraulic oil is switched and controlled.

  Reference numeral 35 denotes a compressed air chamber into which compressed air is introduced. The cylinder tube 19, the lower lid member 20, and the piston 24 form a compartment on the other end of the piston 24 opposite to one end protruding the piston rod 16. Connected to A. Then, the pressure booster 15 receives pressure on the hydraulic oil chamber 25 side of the piston 24 so as to increase and discharge the hydraulic oil in the hydraulic oil chamber 25 by the action of the compressed air introduced into the compressed air chamber 35 to the piston 24. The area is set smaller than the pressure receiving area on the compressed air chamber 35 side by an amount corresponding to the transverse area of the piston rod 16.

  36A and 36B are first and second detection means for detecting the position of the piston rod 16 in the vertical direction, and are composed of proximity type position detection switches. The first detection means 36A is detachably attached to the upper end position of the tie rod 18, and hydraulic oil When the protruding end face of the piston rod 16 is positioned at an upper position where the amount of hydraulic oil charged in the chamber 25 becomes small, a signal is generated, and the second detection means 36B has a gap in the axial direction with the first detection means 36A and the tie rod 18 When the projecting end face of the piston rod 16 is located at a lower position where the amount of hydraulic oil filled in the hydraulic oil chamber 25 is sufficient, the signal is generated. 37 is an electromagnetically operated on / off valve, which is disposed in a connection flow path 38 connecting the flow path 31 connected to the discharge flow path 10 and the return flow path 12, and normally shuts off the connection flow path 38 by energization. The connection flow path 38 is communicated by de-energization when the entire power supply is turned off or during an emergency stop.

Next, the operation of this configuration will be described.
In the state of FIG. 2, each electromagnetic switching valve 34 </ b> A to 34 </ b> F is set to a non-energized neutral position to cut off the flow path 33, and the on / off valve 37 is turned on to cut off the connection flow path 38. When the hydraulic pump 7 is driven to rotate, the hydraulic pump 7 sucks the hydraulic oil stored in the tank 1 from the suction flow path 9 and discharges it to the discharge flow path 10, and the hydraulic oil flows from the discharge flow path 10 to the flow paths 28, 27, 26. And the hydraulic oil chamber 25 of the pressure intensifier 15 is filled. The piston 24 moves downward against the acting force based on the pressure of the compressed air introduced into the compressed air chamber 35 by the acting force based on the pressure of the working oil filled in the working oil chamber 25, and the piston rod 16 is moved in FIG. When it moves to the lower position shown in the left half, the second detection means 36B generates a signal and stops the electric motor 6.

In this state, for example, when the electromagnetic switching valve 34A in the neutral position is energized and switched to the left position, the pressure intensifier 15 moves the piston 24 upward by the acting force based on the pressure of the compressed air introduced into the compressed air chamber 35. Then, the hydraulic oil filled in the hydraulic oil chamber 25 is increased in pressure based on the area ratio between the compressed air chamber 35 and the hydraulic oil chamber 25 and discharged to the flow path 26. The hydraulic oil discharged to the flow path 26 is blocked by the check valve 11 to the hydraulic pump 7 side, flows through the flow paths 31 and 33, and is supplied from the electromagnetic switching valve 34A to the cap side of the hydraulic cylinder 13A. The hydraulic cylinder 13A operates in the right direction in FIG. 2 , and hydraulic oil from the head side flows through the return flow path 12 and returns to the inside of the tank 1.

In a state in which the hydraulic cylinder 13A is operated in the right direction in FIG. 2, when the switching to the neutral position in the non-energized the electromagnetic switching valve 34A, the hydraulic cylinder 13A is stopped at the right in FIG. In this state, when the electromagnetic switching valve 34A is energized and switched to the right position, hydraulic fluid flowing through the flow paths 26, 31, 33 is supplied to the head side of the hydraulic cylinder 13A by the electromagnetic switching valve 34A . 2 , the hydraulic oil from the cap side flows through the return flow path 12 and returns to the inside of the tank 1. When the hydraulic cylinder 13A returns to the state shown in FIG. 2 , the electromagnetic switching valve 34A is deenergized to switch to the neutral position, and the hydraulic cylinder 13A is stopped. In addition to the single hydraulic cylinder 13A operating as described above, any number of the six electromagnetic switching valves 34A to 34F can be switched at the same time so that the corresponding hydraulic cylinders 13A to 13C can be switched simultaneously. It can also be activated.

  When the hydraulic oil filled in the hydraulic oil chamber 25 of the pressure intensifier 15 is consumed by the operation of the hydraulic cylinder 13A, the amount of hydraulic oil in the hydraulic oil chamber 25 becomes small, and the piston rod 16 moves to the upper position shown in the right half of FIG. The first detection means 36A emits a signal, rotates the electric motor 6 again, and fills the hydraulic oil chamber 25 with the hydraulic oil discharged from the hydraulic pump. When the hydraulic oil charged in the hydraulic oil chamber 25 becomes a sufficient amount and the piston rod 16 moves to the lower position shown in the left half of FIG. 2, the electric motor 6 is stopped.

  With this operation, the motor 6 for rotating the hydraulic pump 7 can be accommodated in the recessed portion 16A having a recess formed in the protruding end surface of the piston rod 16 protruding to the outside of the pressure booster 15. The piston rod 16 that protrudes to the outside can secure a space that is open to the outside so that the electric motor 6 can be accommodated, so that the electric motor 6 is not affected by the axial movement of the piston rod 16, and the piston of the pressure intensifier 15. The entire device can be made compact by being superposed with the rod 16.

  Further, the electric motor 6 and the tank 1 are connected in the vertical direction with the flange member 2 interposed therebetween, and the pressure intensifier 15 is arranged in the vertical direction in which the piston rod 16 protrudes upward, and the electric motor 6 is placed in the recess 16A of the piston rod 16. The flange member 2 is arranged above the intensifier 15 so as to be able to be accommodated, and the protruding end surface of the piston rod 16 abuts on the flange member 2 by the axial movement of the piston rod 16 to restrict the movement of the piston rod 16. 2A. For this reason, the piston rod is moved by the axial movement of the piston 24 and the piston rod 16 that increase and discharge the hydraulic oil in the hydraulic oil chamber 25 by the action of the compressed air introduced into the compressed air chamber 35 of the pressure intensifier 15 on the piston 24. Since the piston rod 16 can be stopped by the projecting end surface of 16 coming into contact with the stopper 2A of the flange member 2, the electric motor 6 accommodated in the concave portion 16A can be prevented from colliding with the bottom surface of the concave portion 16A. Can be satisfactorily prevented.

  Further, the electric motor 6 and the tank 1 are connected in the vertical direction with the electric motor 6 facing downward, and the pressure intensifier 15 is disposed in the vertical direction protruding upward so that the electric motor 6 can be accommodated in the recess 16A. . For this reason, even if the motor and the tank are connected vertically in the tank downward direction and the tank is accommodated in the recess, the tank is overlapped with the piston rod of the intensifier without being affected by the axial movement of the piston rod. Compared to this hydraulic device, the tank 1 can be transmitted without passing through the tank 1 even if the piston rod 16 of the pressure intensifier 15 moves in the axial direction. By using a material that is compatible, the amount of hydraulic oil stored in the tank 1, the contamination of the hydraulic oil, the amount of foreign matter (contamination) mixed in the hydraulic oil can be easily seen from the outside, Abnormalities can be easily detected.

  In the embodiment, the electric motor 6 and the tank 1 are connected in the vertical direction with the electric motor 6 facing downward, and the electric motor 6 is accommodated in the recess 16A. However, the electric motor and the tank are connected in the vertical direction with the tank facing downward. And you may accommodate an electric motor in a recessed part. Further, although the electromagnetic switching valves 34A to 34F are directly attached to the manifold 32, the electromagnetic switching valve may be attached to the manifold via a flow control valve that controls the flow rate of the hydraulic oil or a pressure control valve that controls the pressure of the hydraulic oil. Of course.

It is a longitudinal cross-sectional view of the hydraulic apparatus which showed one Embodiment of this invention. It is a hydraulic circuit diagram of one embodiment.

Explanation of symbols

1: Tank 6: Electric motor 7: Hydraulic pump 15: Booster 16: Piston rod 16A: Recess 23: Cylinder 24: Piston 25: Hydraulic oil chamber 35: Compressed air chamber

Claims (3)

  It is filled with a tank that stores hydraulic oil, an electric motor that rotates the hydraulic pump, a hydraulic pump that is driven by the electric motor to suck and discharge the stored hydraulic oil in the tank, and a hydraulic oil that is discharged from the hydraulic pump. The pressure booster is equipped with a pressure booster that boosts and discharges the filled hydraulic oil. The pressure booster is inserted into the cylinder so as to be slidable in the axial direction, and one end of the cylinder penetrates one end of the cylinder in a liquid-tight manner. A piston rod that protrudes to the outside, and a compressed air chamber that introduces compressed air into the other end of the cylinder that faces the one end that protrudes the piston rod of the piston is defined and one end of the piston A hydraulic oil chamber filled with hydraulic oil is defined between the piston rod outer periphery and the cylinder inner periphery, and the hydraulic oil in the hydraulic oil chamber is increased by the action of the compressed air introduced into the compressed air chamber on the piston. The pressure receiving area on the hydraulic oil chamber side of the piston is smaller than the pressure receiving area on the compressed air chamber side so that the piston rod can be discharged. A hydraulic apparatus characterized in that either an electric motor or a tank for storing hydraulic oil therein can be accommodated.   The electric motor and the tank are connected in a vertical direction with a flange member interposed therebetween, and the pressure intensifier is arranged in a vertical direction in which the piston rod protrudes upward, and the electric motor or the tank is disposed in the concave portion of the piston rod. The flange member is arranged above the pressure intensifier so as to be able to accommodate either one, and the protruding end surface of the piston rod comes into contact with the flange member by the axial movement of the piston rod to move the piston rod. The hydraulic apparatus according to claim 1, further comprising a stop portion for regulating.   The hydraulic pump is housed in the tank, the electric motor and the tank are connected in the vertical direction with the electric motor downward, and the pressure intensifier is arranged in the vertical direction protruding the piston rod, The hydraulic apparatus according to claim 1, wherein the electric motor can be accommodated in the recess.

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