JP5031282B2 - Closed kneader - Google Patents

Description

  The present invention relates to a hermetic kneader for kneading a material to be kneaded in a kneading chamber, and more particularly to a hermetic kneader configured to raise and lower a floating weight for pushing the material to be kneaded into the kneading chamber.

  This type of closed kneading machine is disclosed in, for example, Patent Document 1, which provides a hydraulic cylinder for lowering the floating weight and pushing it into the kneading chamber side, An air-hydraulic converter that converts pressure between them is provided separately from the kneader main body, and the hydraulic side of the hydraulic cylinder is connected to the hydraulic side of the air-hydraulic converter. This hermetic kneader smoothly guides the material to be kneaded into the kneading chamber by lowering the floating weight while appropriately exerting a cushioning function on the weight by the air pressure of the pneumatic hydraulic converter, and smoothly smoothes the material to be kneaded. It can be kneaded.

In addition, the above-mentioned closed kneader is provided with an electromagnetic direction switching valve for switching the advance and retreat of the hydraulic cylinder and an ON / OFF type limit switch for monitoring the movement of the floating weight that is moved up and down. When the value reaches, the electromagnetic directional control valve is switched in accordance with a signal from the limit switch to stop the lowering of the weight.
JP-A-9-206581 (FIG. 1, paragraph number 0023, etc.)

  In such a closed-type kneader, due to the recent diversification of materials to be kneaded, the weight position is fixed and kneaded at various positions, and the pressing pressure of the weight is arbitrarily set when pushing or kneading. There is an increasing need for new kneading methods that can be controlled.

  However, in the closed kneader of Patent Document 1, since the position of the floating weight is detected by the ON / OFF signal from the limit switch, the position of the limit switch must be changed in order to change the weight position. The effort was complicated.

  In the above-mentioned closed kneader, an air-hydraulic converter must be installed around the closed kneader, and a large installation space is required. In the above-mentioned closed kneader, although it is theoretically possible to change the weight pressing pressure by changing the air supply to the pneumatic pressure side of the pneumatic / hydraulic converter, the control for greatly changing the weight pressing pressure is possible. Therefore, since it is necessary to supply and discharge a large volume of air and it takes time to change the pressure, it is practically difficult to control the pressure within a predetermined kneading time.

  In addition, as a closed type kneader, a type in which the floating weight is lowered by an air cylinder has been conventionally known, but a large air cylinder is required, and there is room for improvement from the viewpoint of equipment cost and space. It was. In addition, a large volume of air is required for lifting and lowering the weight, which increases the running cost and is not preferable from the viewpoint of energy saving. Furthermore, since the position control is performed using air that is a compressed fluid, it is difficult to control the position of the weight to various positions with good accuracy. It has also been difficult to control the weight pressing pressure to change greatly within a predetermined kneading time.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

According to an aspect of the present invention, a closed kneader configured as follows is provided. A floating weight, which is connected to the kneader main body and into which the material to be kneaded is placed, is provided with a floating weight that can be raised and lowered by a hydraulic cylinder. A position detection device that can continuously detect the raising / lowering position of the floating weight, and a stop position of the floating weight is arbitrarily set in advance within a range in which the position detection device can continuously detect the raising / lowering position of the floating weight. Position setting means capable of performing, and a position control device for controlling the raising / lowering position of the floating weight based on a position detection signal of the position detection device and a set value of a stop position of the floating weight preset in the position setting means; A switching valve provided in a supply line for supplying pressure oil from a hydraulic source to the hydraulic cylinder, and stopping supply of the pressure oil to the hydraulic cylinder by a stop signal to stop the operation of the hydraulic cylinder; Prepare. The position control device is configured to output a stop signal to the switching valve to stop the operation of the hydraulic cylinder when the position detection signal matches a set value of the stop position of the floating weight .

  As a result, the position detection device can detect that the floating weight has reached an arbitrary set position, and based on this, the operation of the hydraulic cylinder can be stopped to stop the floating weight. Therefore, even if it is desired to change the stop position of the floating weight in order to change the capacity of the kneading chamber, only setting by the position setting means is required, and complicated work (such as changing the limit switch mounting position in Patent Document 1) is omitted. can do. In addition, since the suspension of the floating weight is realized by stopping the operation of the hydraulic cylinder, the precision of the floating weight position control is better than in the configuration using the air cylinder described above, and the equipment space and cost can be reduced, resulting in energy saving. It can be configured.

In the closed kneader, the position setting means is preferably configured to be capable of setting a plurality of set values for the stop position of the floating weight.

  Thereby, the switching of the position of the floating weight at the time of kneading can be performed very easily.

In the hermetic kneader, the position setting means is preferably configured to be capable of setting a plurality of set values for the stop position of the floating weight according to predetermined operating conditions.

  Thereby, the position of the floating weight at the time of kneading can be easily switched according to various operating conditions, and various kneading methods can be dealt with finely and flexibly.

In internal mixer of the connected the pressure oil supply line to supply feed to the hydraulic chamber of each floating weight pressurizing side of said hydraulic cylinder, the upward force which the floating weight is received when the kneading is performed It is preferable to provide an accumulator that receives the buffer .

  Thereby, it is possible to realize the stop at the setting position of the floating weight with a simple configuration without providing a special stop mechanism.

The closed kneader is preferably configured as follows. Wherein a pressure sensor for detecting the pressure of the hydraulic fluid acting on the floating weight pressurizing side of the hydraulic cylinder, a pressure setting means for setting the pressure of the hydraulic fluid Ru allowed to act on the floating weight pressurizing side of said hydraulic cylinder, said from the hydraulic source a remotely actuated relief valve to release the pressure oil supplied to the hydraulic cylinder to the tank side, the remote actuation relief valve based on the pressure setpoint of the pressure detection signal and the pressure setting means of the pressure sensor during the descent of the floating weight And a pressure control device for controlling. The pressure control device is configured to output a command signal to the remotely operated relief valve so that the pressure detection signal matches the pressure set value.

  Thus, unlike the configuration having the air-hydraulic converter of Patent Document 1, the pressing pressure of the floating weight can be changed by adjusting the relief pressure of the relief valve, so that the weight pressing pressure accompanying a large pressure change can be quickly controlled. Can do. In addition, the weight pressing pressure can be directly controlled with good responsiveness as compared with the configuration in which the weight pressing pressure control is performed by changing (only) the position of the floating weight.

In the closed kneader, the pressure setting means is configured to be able to set a plurality of pressure oil pressure setting values to be applied to the floating weight pressurization side of the hydraulic cylinder according to predetermined operating conditions. It is preferable.

  Thereby, the weight pressing pressure at the time of kneading can be easily switched according to various operating conditions, and it is possible to respond flexibly and finely to various kneading methods.

  In the above-described closed kneader, it is preferable that a motor that drives a hydraulic pump as a hydraulic source of the hydraulic cylinder is a variable speed motor.

  Thereby, the moving speed of the weight and the rising time of the pressure oil can be adjusted more finely.

  Next, an example of the overall configuration of a closed kneader according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a partial cross-sectional view showing the overall configuration of a closed kneader.

  1 is for kneading a material to be kneaded, such as rubber or resin, and includes a chamber 1 as a kneading machine body having a kneading chamber 9 inside, and kneading. A kneading rotor 4 for kneading the material to be kneaded in the chamber 9 and a floating weight 6 for pushing the material to be kneaded into the kneading chamber 9 with a predetermined pressure are provided as main components.

  In the chamber 1, a kneading chamber 9 having a cross section in which two circles are arranged side by side and partially connected to each other is formed. A supply port 7 is formed in the upper part of the central portion in the horizontal direction of the kneading chamber 9, and a discharge port 3 is formed in the lower part. The floating weight 6 is disposed at the upper supply port, and the door top 2 a of the drop door 2 is disposed at the lower discharge port 3. The kneading chamber 9 is partitioned and formed by the inner wall of the chamber 1, the lower portion of the floating weight 6, and the door top 2 a of the drop door 2 so as to exhibit the above shape.

  A hopper 11 is provided at the upper portion of the chamber 1 so as to be connected to the supply port 7, and the hopper 11 is provided with an inlet 10 for a material to be kneaded. On the other hand, the drop door 2 disposed in the lower portion of the chamber 1 is configured to be able to switch the closing / opening of the discharge port 3 by a door opening / closing mechanism 8. As a result, the outlet 3 is closed during kneading, while the outlet 3 can be opened after the kneading is completed, and the material to be kneaded in the kneading chamber 9 can be discharged.

  Further, the closed kneader X is provided with a latch 5, and the latch 5 pushes the drop door 2 to the chamber 1 side during kneading to maintain the sealing property in the kneading chamber 9 during kneading of the material to be kneaded. On the other hand, after kneading is completed, the latch 5 is retracted from the drop door 2 so that the drop door 2 can be opened.

  Two rotating rotors 4 are arranged in the kneading chamber 9, and each rotor 4 is driven to rotate by a drive motor (not shown). Each rotor 4 is rotationally driven by the drive motor so as to sweep the inner wall of the kneading chamber 9. The rotor 4 is inserted into the hopper 11 (kneader body) from the charging port 10, and the floating weight 6 is lowered to feed the kneading chamber 9 from the supply port 7. Kneaded rubber and resin to be pushed into the.

  The floating weight 6 is disposed in the hopper 11, and the floating weight 6 is slidable in the vertical direction. The floating weight 6 is integrally connected to a connecting beam 14 constituting a part of the weight device Y through a rod (shaft member) 13. The weight device Y is for moving the floating weight 6 up and down and adjusting the pressing pressure against the material to be kneaded. The floating weight 6 is integrated with the connecting beam 14 and two hydraulic cylinders 15 and 15 are connected. It is configured. The two hydraulic cylinders 15 and 15 are arranged so as to sandwich the hopper 11 therebetween so as to avoid the inlet 10 for the material to be kneaded.

  Next, a specific configuration of the weight device Y will be described. 1 and 2, the weight device Y includes a connecting beam 14 in which the rod 13 is integrally fixed in a T-shape at the center thereof, and two hydraulic cylinders 15 and 15 connected to both ends of the connecting beam 14. 15 as a main configuration.

  As shown in FIG. 2, the two hydraulic cylinders 15, 15 are configured as double-acting cylinders, and pistons 18 are slidably installed in the cylinder chambers in the respective cylinder bodies 17. The internal space of the cylinder chamber is divided into two hydraulic chambers A and B by the piston 18. One hydraulic chamber B of the two hydraulic chambers A and B generates hydraulic pressure in a direction in which the floating weight 6 is lowered to push the material to be kneaded, and is a pressure chamber on the floating weight pressurizing side. . The other hydraulic chamber A is a pressure chamber that generates an oil pressure in a direction in which the floating weight 6 is raised. As shown in FIG. 2 as an example, a hydraulic circuit that constitutes a part of the weight device Y is connected to the hydraulic chambers A and B.

  A movable rod 19 extending from the cylinder body 17 is connected to the piston 18. The movable rod 19 extends upward from the cylinder body 17 and is connected to both ends of the connecting beam 14.

  A linear scale 40 as a position sensor is provided at an appropriate position of the hydraulic cylinder 15. The linear scale 40 is configured as an absolute type magnetic sensor that reads a magnetic scale installed on the movable rod 19 of the hydraulic cylinder 15, and the position of the movable rod 19 (and hence the position of the floating weight 6) is continuously and It can be detected steplessly. The signal of the linear position of the floating weight 6 read by the linear scale 40 is transmitted to the control device 50 of the weight device Y.

  In this configuration, when pressure oil is supplied to the hydraulic chamber A in each hydraulic cylinder 15, the movable rod 19 extends upward to raise the connecting beam 14, and thereby the floating weight 6 rises in the hopper 11. On the other hand, when pressure oil is supplied to the hydraulic chamber B, the movable rod 19 is retracted downward to lower the connecting beam 14, whereby the floating weight 6 is lowered toward the kneading chamber 9.

  Next, the hydraulic circuit will be described with reference to FIG. The hydraulic circuit is driven by a drive motor 24 to switch hydraulic pump (hydraulic power source) 23 that draws hydraulic oil from the pressure oil tank 20 and discharges it to the supply line 22, and raise / lower / stop the floating weight 6. And an electromagnetic direction switching valve 25. The drive motor 24 is a variable speed motor driven by inverter control.

  Connected to the supply line 22 is a pilot-operated relief valve (remotely operated relief valve) 42 that can remotely and continuously control the pressure of the supply line 22 continuously and continuously. A pressure signal (command signal) from the control device 50 is amplified and input to the solenoid of the pilot portion of the pilot operated relief valve 42 by the amplifier 53. With this configuration, when a pressure signal is input from the control device 50, a suction force corresponding to the current value is generated in the solenoid to press the valve body, and the relief pressure of the relief valve 42 can be changed.

  The supply line 22 is connected to a P port of an electromagnetic direction switching valve 25 described below. The supply line 22 is provided with a check valve 38 for preventing backflow.

  The electromagnetic direction switching valve 25 is connected to a P port connected to the supply pipeline 22, a T port connected to the pressure oil tank 20, and hydraulic chambers A and B of the two hydraulic cylinders 15 and 15, respectively. The control device 50 transmits an operation signal to excite / demagnetize the solenoid so that the valve body can be switched to each position.

  The supply line 22 is connected to the P port of the electromagnetic direction switching valve 25 as described above. Further, the hydraulic chamber A of the two hydraulic cylinders 15 and 15 is connected to the A port via the working line 26, and the hydraulic chamber B of the hydraulic cylinders 15 and 15 is similarly connected to the B port through the working line 27. Connected through.

  A pilot check valve 33 is disposed in the working line 26 connected to the A port of the electromagnetic direction switching valve 25. The pilot check valve 33 is configured so as to prevent the flow from the hydraulic cylinders 15 and 15 to the electromagnetic direction switching valve 25 in the normal time and to allow the flow in the opposite direction. However, the pilot pipe of the pilot check valve 33 is connected to the B pipe side working pipe 27, and when the pressure of the working pipe 27 rises, the pilot check valve 33 is forcibly opened, and the hydraulic cylinder The flow from 15.15 to the electromagnetic direction switching valve 25 is allowed.

  In addition, a pilot check valve 31 is arranged in the working line 27 connected to the B port of the electromagnetic direction switching valve 25. Similar to the pilot check valve 33, the pilot check valve 31 is configured to block the flow from the hydraulic cylinders 15 and 15 to the electromagnetic direction switching valve 25 and allow the flow in the opposite direction. ing. However, the pilot line of the pilot check valve 31 is connected to the operation line 26 on the A port side, and when the pressure in the operation line 26 rises, the pilot check valve 31 is forcibly opened, and the hydraulic cylinder The flow from 15.15 to the electromagnetic direction switching valve 25 is allowed.

  Furthermore, a relief valve 32 is connected to the working line 27. The relief valve 32 is normally positioned at a position where the operating line 27 and the pressure oil tank 20 are blocked by a valve spring. On the other hand, when the pressure in the working line 27 rises abnormally, the pilot pressure introduced from the working line 27 pushes the valve body against the valve spring, so that the working line 27 communicates with the pressure oil tank 20. The pressure oil is allowed to escape.

  Further, a pressure sensor 34 for measuring the pressure (and hence the so-called ram pressure) of the working line 27 is connected to the working line 27, and the pressure signal detected by the pressure sensor 34 is sent to the control device 50 of the weight device Y. In contrast, it is input. Further, a piston type accumulator 35 filled with high-pressure nitrogen gas is connected to the working line 27 so as to absorb and buffer pressure fluctuations in the working line 27.

  The control device 50 of the weight device Y includes a CPU, a ROM, a RAM, a timer circuit, and the like, and is connected to various sensors (including the pressure sensor 34) for monitoring the operation status of the closed kneader X. . In addition, a position setter (position setting means) 51 and a pressure setter (pressure setting means) 52 are electrically connected to the control device 50. The position setting device 51 includes, for example, a numeric keypad, and the position of the floating weight 6 can be set by inputting from the numeric keypad. Similarly, the pressure setter 52 can be set by inputting the pressure of the floating weight 6 from the numeric keypad.

  In the present embodiment, the position setting device 51 may have various operating conditions (for example, every predetermined time, every predetermined pressure, a predetermined barrel temperature, a predetermined cooling water temperature, a predetermined kneading material temperature, etc.). ), A plurality of set values for the stop position of the floating weight 6 described above can be set. Similarly, the pressure setter 52 is configured to be capable of setting a plurality of pressing pressures of the floating weight 6 according to the same various operating conditions as described above. The plurality of set values set by these setting devices 51 and 52 are stored in the RAM or the like (storage means) of the control device 50, and are read out and used as appropriate according to the operating conditions.

  When the floating weight 6 is raised in the above configuration, the drive motor 24 of the hydraulic circuit is driven to discharge the hydraulic oil from the hydraulic pump 23 to the supply line 22, and the control device 50 sends an increase signal to the electromagnetic direction switching valve. 25, the electromagnetic directional control valve 25 is switched, the A port is connected to the P port, and the B port is connected to the T port. Then, the pressure oil supplied from the P port to the working pipeline 26 passes through the pilot check valve 33 and is supplied to the hydraulic chambers A of the two hydraulic cylinders 15 and 15. Thus, the piston 18 and the movable rod 19 move upward, and the floating weight 6 rises. As the piston 18 moves up, the pressure oil in the opposite hydraulic chamber B is discharged from the cylinder body 17 to the working line 27, and the discharged pressure oil passes through the pilot check valve 31 that is forcibly opened, and the electromagnetic direction. The switch valve 25 is returned from the B port to the pressure oil tank 20 via the T port.

  FIG. 2 shows a state in which the floating weight 6 has risen to the vicinity of the upper limit. After the material to be kneaded is charged from the charging port 10 in this state, the lowering operation of the floating weight 6 is performed as follows. That is, the control device 50 sends a descending signal to the electromagnetic direction switching valve 25 to switch the electromagnetic direction switching valve 25, connect the A port to the T port, and connect the B port to the P port. Then, the pressure oil supplied from the P port to the working line 27 passes through the pilot check valve 31 and is supplied to the hydraulic chambers B of the two hydraulic cylinders 15 and 15. Thus, the piston 18 and the movable rod 19 are moved downward, and the floating weight 6 is lowered. The pressure oil in the hydraulic chamber A on the opposite side is discharged from the cylinder body 17 to the working line 26 by the rise of the piston 18 and passes through the pilot check valve 33 that is forcibly opened. The pressure oil tank 20 is returned from the A port via the T port.

  As described above, the electromagnetic direction switching valve 25 connects between the A port and the T port and between the B port and the P port, and supplies pressure oil to the hydraulic chamber B (pressure side hydraulic chamber) of each hydraulic cylinder 15. The movable rod 19 is retracted into the cylinder body 17 and the material to be kneaded is pushed into the kneading chamber 9 with an appropriate pressing force by the floating weight 6 connected to the movable rod 19 via the connecting beam 14 and the rod 13. (Press). Thus, the materials to be kneaded are kneaded by the rotors 4 and 4 rotating in the kneading chamber 9.

  Here, the rotors 4 and 4 in the kneading chamber 9 rotate so as to guide a part of the material to be kneaded into the kneading chamber 9 and push the rest out of the kneading chamber 9. I try to rise slightly under the power. However, since the accumulator 35 is connected to the working line 27 connected to the hydraulic chamber B on the pressurizing side, the floating weight 6 can receive the above-described push-up in a buffering manner (cushion action). Thus, by lowering the floating weight 6 while exhibiting the cushion function, the material to be kneaded can be gradually guided into the kneading chamber 9 and kneaded by the rotation of the rotor 4.

  Further, while the floating weight 6 is being lowered, the pressure in the hydraulic chamber B on the floating pressurization side is constantly detected by the pressure sensor 34 as the pressure in the working conduit 27, and this pressure signal is detected by the control device 50. Has been entered. Then, the control device 50 sends a command signal to the pilot operated relief valve 42 via the amplifier 53 so that the pressure detected by the pressure sensor 34 becomes a pressure corresponding to the pressure set by the pressure setting device 52. As a result, the pressing pressure of the floating weight 6 against the material to be kneaded can be easily and quickly changed through the pressure change of the supply pipe line 22.

  Further, the position signal detected by the linear scale 40 is input to the control device 50 every moment during the above-described lowering operation of the floating weight 6. When the position detected by the linear scale 40 becomes equal to the position set in advance by the position setting device 51, the control device 50 sends a stop signal to the electromagnetic direction switching valve 25 to switch the electromagnetic direction switching valve 25 to the closed position. Block A port and B port. As a result, the supply and discharge of the pressure oil to and from the hydraulic chambers A and B of the hydraulic cylinder 15 are stopped, so that the floating weight 6 can be accurately stopped at the position set by the position setting device 51.

  As described above, the hermetic kneader X of the present embodiment has the floating weight 6 that is connected to the chamber 1 and into which the material to be kneaded is placed, and which can be raised and lowered by the hydraulic cylinders 15 and 15. Prepare. And the linear scale 40 which can detect the raising / lowering position of the floating weight 6 continuously, the position setting device 51 which sets the raising / lowering position of the floating weight 6, the position detection signal of the linear scale 40, and the position setting device And a control device 50 for controlling the raising / lowering position of the floating weight 6 based on the set value 51. The control device 50 outputs a stop signal to stop the operation of the hydraulic cylinders 15 and 15 when the position detection signal output from the linear scale 40 matches the set value by the position setter 51.

  Thus, the linear scale 40 detects that the floating weight 6 has reached an arbitrary set position, and based on this, the operation of the hydraulic cylinder 15 can be stopped. Therefore, for example, even when it is desired to change the stop position of the floating weight 6 in order to change the capacity of the kneading chamber 9, only the setting by the position setting device 51 is required, and complicated (such as changing the limit switch mounting position in Patent Document 1). Can be omitted. In other words, the lifting position of the floating weight 6 can be set with a very high degree of freedom.

  Further, since the suspension of the floating weight 6 is realized by stopping the operation of the hydraulic cylinder 15, the accuracy of the position control of the floating weight 6 is good as compared with the configuration using the conventional air cylinder. In addition, since it is not necessary to install an air-hydraulic converter having a large structure, it can be easily applied to an existing hydraulic cylinder type hermetic kneader.

  Further, the closed kneader X of the present embodiment is configured such that a plurality of elevating positions can be set by the position setting device 51. Therefore, switching of the position of the floating weight 6 during kneading can be extremely facilitated. Further, the plurality of lift positions can be set according to predetermined operating conditions. Therefore, the position of the floating weight 6 at the time of kneading can be easily switched according to various operating conditions, and various kneading methods can be flexibly handled. For example, a fine pattern of the raising / lowering position of the floating weight 6 can be realized according to the progress of kneading, the material of the material to be kneaded, and the control pattern of the raising / lowering position can be changed very easily.

  Further, the closed kneading machine X of the present embodiment stops the operation of the hydraulic cylinders 15 and 15 by stopping the supply of pressure oil to the hydraulic cylinders 15 and 15 by a stop signal from the control device 50. A valve 25 is provided. Therefore, it is possible to realize the stop at the set position of the floating weight 6 with a simple configuration without providing a special stop device.

  The closed-type kneader X of the present embodiment includes a pressure sensor 34 that detects the pressure of pressure oil acting on the floating weight 6 pressure side of the hydraulic cylinders 15 and 15 (the side on which the floating weight 6 is lowered), and the hydraulic pressure. Pressure setting device 52 for setting the pressure oil pressure acting on the floating weight pressurization side of the cylinder 15 and a pilot-operated relief for releasing the pressure oil supplied from the hydraulic pump 23 to the hydraulic cylinders 15 and 15 to the pressure oil tank 20 side. And a valve 42. The control device 50 is configured to output a command signal to the pilot operated relief valve so that the pressure detection signal matches the pressure set value. Therefore, unlike the configuration having the air-hydraulic converter disclosed in Patent Document 1 described above, the pressing pressure of the floating weight 6 can be changed by adjusting the relief pressure of the relief valve 42. Therefore, the control of the weight pressing pressure accompanying a large pressure change can be quickly performed. It can be carried out.

  Further, the weight pressing pressure can be directly controlled with good responsiveness as compared with the configuration in which the weight pressing pressure control is performed by changing the air supply pressure. Further, the weight pressing pressure can be remotely controlled by the pilot-actuated relief valve 42, so that it is not necessary to check the weight pressing pressure and adjust the pressure at the site, and the management cost can be greatly reduced.

  Further, in the closed kneader X of the present embodiment, the pressure setting device 52 is configured to be capable of setting a plurality of pressures so as to change the pressure according to predetermined operating conditions. Therefore, the weight pressing pressure at the time of kneading can be easily switched according to various operating conditions, and it is possible to flexibly cope with various kneading methods. For example, a fine control pattern of the pressing pressure can be realized according to the progress of the kneading, the material of the material to be kneaded, and the control pattern of the pressing pressure can be changed very easily.

  Further, in the closed kneader X of the present embodiment, an accumulator 35 is connected to the floating weight pressurizing side (operating pipe line 27). Thereby, a so-called cushioning action when the floating weight 6 is lowered can be provided with a compact and low-cost configuration.

  In this embodiment, the drive motor 24 of the hydraulic pump 23 is an inverter-controlled variable speed motor. Therefore, by controlling the shift of the drive motor 24 with the drive signal from the control device 50, the moving speed of the floating weight 6 and the pressure oil rising time can be adjusted more finely.

  Although the preferred embodiments of the present invention have been described above, the above configuration can be implemented with the following modifications, for example.

  Instead of a configuration in which the hydraulic cylinders 15 and 15 are stopped by inputting a stop signal from the control device 50 to the electromagnetic direction switching valve 25 and switching the valve body to the closed position, a mechanical locking mechanism (see FIG. 2 can be provided, and the hydraulic cylinder 15 and the floating weight 6 can be stopped by inputting a stop signal from the control device 50 to the lock mechanism 45. As an example of the mechanical lock mechanism 45, as shown in a plan sectional view of the main part of FIG. 3, a pair of brake members 61 and 62 which are provided so as not to move up and down and can hold the rod 13 and the pair of brakes A clamping spring 63 that applies a biasing force in the direction in which the members 61 and 62 tighten the rod 13 and a pair of brake members 61 and 62 are tightened against the biasing force of the clamping spring 63 by supplying hydraulic pressure. A configuration comprising a hydraulic cylinder 64 that can be driven in the attaching / detaching direction and a solenoid valve (not shown) that is switched to discharge the hydraulic oil of the hydraulic cylinder 64 when a stop signal from the control device 50 is input. Conceivable. Further, the mechanical lock mechanism 45 may be changed to a configuration provided in the movable rod 19 instead of the rod 13.

  The linear scale 40 as a position sensor (position detection device) can be changed to, for example, an ultrasonic type or an optical type instead of the magnetic type. Alternatively, it can be changed to a combination of a rotary sensor such as a rotary encoder or a potentiometer and a mechanism for converting the linear motion of the movable rod 19 into a rotational motion.

  In the embodiment described above, the linear scale 40 acquires the ascending / descending position of the floating weight 6 by detecting the amount of advancement of the movable rod 19, but this is detected by detecting the positions of the connecting beam 14 and the rod 13. It can change to the composition which acquires the raising / lowering position of weight 6.

  Instead of the above-described nitrogen-filled type accumulator 35, it can be changed to any hydraulic accumulator such as a type that converts to weight potential energy or a type that converts to spring elastic energy.

  In the above-described embodiment, the supply of pressure oil to the hydraulic cylinders 15 and 15 is stopped by switching the electromagnetic direction switching valve 25 by the stop signal from the control device 50. It can change to the structure which stops the pressure oil supply to the hydraulic cylinders 15 and 15.

  In the above-described embodiment, the drive motor 24 is an inverter-controlled variable speed motor. However, the drive motor 24 can be changed to another variable speed motor.

  In the embodiment, when pressure control is performed using the pilot operated relief valve 42, the pressing pressure of the floating weight 6 can be controlled so as to exhibit the above-described cushion action. In this case, the relief valve can be disposed at a position where the cylinder pressing force can be adjusted, and the accumulator 35 can be omitted. For example, it is good also as a structure as shown in FIG. That is, as shown in the hydraulic circuit of FIG. 4, when the accumulator 35 is omitted from the hydraulic circuit of FIG. 2, the pilot check valve 31 is omitted, and the pilot-operated relief valve 42 is replaced with an electromagnetic direction switching valve of the check valve 38. It is good also as a structure connected to the supply pipeline 22 of 25 side.

  Alternatively, in the above-described embodiment, the pilot-operated relief valve 42 can be changed to a normal relief valve whose relief pressure cannot be remotely operated, and can be changed to a configuration in which only the position control of the floating weight 6 is performed.

The partial cross section figure which shows the whole structure of a closed kneading machine. The hydraulic circuit diagram which shows the structure of the hydraulic weight apparatus of a closed kneading machine. The principal part top view which shows the structure of the mechanical lock mechanism in a modification. Hydraulic circuit diagram showing another configuration of hydraulic weight device of hermetic kneader

Explanation of symbols

1 Chamber (kneader body)
6 Floating weight 9 Kneading chamber 11 Hopper 15 Hydraulic cylinder 25 Electromagnetic direction switching valve (switching valve)
40 Linear scale (position detection device)
42 Pilot operated relief valve (remotely operated relief valve)
50 Control device (position control device, pressure control device)
51 Position setting device (position setting means)
52 Pressure setter (Pressure setting means)

Claims (7)

In a hermetic kneader equipped with a floating weight which is connected to the kneading machine main body and into which a material to be kneaded is placed, and which can be raised and lowered by a hydraulic cylinder,
A position detection device capable of continuously detecting the raising and lowering position of the floating weight;
In a range where the position of the floating weight can be continuously detected by the position detection device, position setting means capable of arbitrarily setting a stop position of the floating weight in advance ,
A position control device for controlling the raising / lowering position of the floating weight based on a position detection signal of the position detection device and a set value of a stop position of the floating weight preset in the position setting means;
A switching valve that is provided in a supply line that supplies pressure oil from a hydraulic source to the hydraulic cylinder, and stops operation of the hydraulic cylinder by stopping supply of the pressure oil to the hydraulic cylinder by a stop signal. ,
The position control device is configured to output a stop signal to the switching valve to stop the operation of the hydraulic cylinder when the position detection signal matches a set value of a stop position of the floating weight. A closed kneader. The closed kneading machine according to claim 1,
The position setting means is configured to be capable of setting a plurality of set values for the stop position of the floating weight. A closed kneader according to claim 2,
The closed kneading machine is characterized in that the position setting means is configured to be capable of setting a plurality of set values for the stop position of the floating weight according to predetermined operating conditions. A closed kneader according to any one of claims 1 to 3, wherein
Is connected to pressure oil supply line to supply feed to the hydraulic chamber of each floating weight pressurizing side of said hydraulic cylinder, and includes an accumulator for receiving buffered manner the upward force which the floating weight is received when the kneading is performed A closed kneader characterized by the above. A closed kneader according to any one of claims 1 to 4, wherein
A pressure sensor for detecting pressure of pressure oil acting on a floating weight pressurization side of the hydraulic cylinder;
Pressure setting means for setting the pressure of pressure oil to be applied to the floating weight pressing side of the hydraulic cylinder;
A remotely actuated relief valve for releasing pressure oil supplied from a hydraulic source to the hydraulic cylinder to the tank;
A pressure control device for controlling the remotely operated relief valve based on a pressure detection signal of the pressure sensor and a pressure setting value of the pressure setting means during the lowering of the floating weight;
The closed kneading machine is characterized in that the pressure control device is configured to output a command signal to the remotely operated relief valve so that the pressure detection signal and the pressure set value coincide with each other. The closed kneading machine according to claim 5,
The pressure setting means is configured to be capable of setting a plurality of set values of pressure of pressure oil to be applied to the floating weight pressurization side of the hydraulic cylinder according to predetermined operating conditions. Kneading machine. A closed kneader according to any one of claims 1 to 6, wherein
A hermetic kneader characterized in that a motor for driving a hydraulic pump as a hydraulic source of the hydraulic cylinder is a variable speed motor.

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