Rubber quantitative extrusion equipment

Abstract

To monitor constant-quantity performance of a rubber constant-quantity extruder without stopping the apparatus.SOLUTION: A method for monitoring constant-quantity capability of a rubber constant-quantity extruder comprises: a first step for acquiring a mass of a rubber material R2 supplied to a rubber constant-quantity extruder 64; a second step for acquiring operational information on the rubber constant-quantity extruder 64 required to extrude the rubber material R2; and a third step for calculating a discharging efficiency calculated from the mass of the rubber material R2 acquired in the first step and the operational information on the rubber constant-quantity extruder 64 acquired in the second step.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a method for monitoring the quantitative capacity of a rubber quantitative extrusion device and to a rubber quantitative extrusion device. [Background technology]

[0002] In the manufacture of tires and the like, rubber constant-volume extrusion devices such as gear pumps and extruders are used to extrude a constant amount of rubber supplied from a supply unit to the outside. When such rubber constant-volume extrusion devices are used for a long period of time, the amount of rubber extruded to the outside becomes inconsistent due to wear of the internal parts.

[0003] When the desired performance is no longer achieved, the device is repaired; however, in order to improve production efficiency by adjusting production plans to coincide with repair times for the rubber quantitative extrusion device and procuring repair parts at the appropriate time, it is desirable to predict the lifespan of the rubber quantitative extrusion device and the time to replace it.

[0004] Therefore, Patent Document 1 listed below proposes a method of detecting the rotation speed of a pair of gears that rotate in mesh with each other in a gear pump and the amount of rubber extruded from the gear pump, and predicting the life of the gear pump from the detected rotation speed and amount of rubber extruded. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication 2014-172318 Summary of the Invention [Problem to be solved by the invention]

[0006] When the method of Patent Document 1 is applied to a rubber constant-volume extrusion device incorporated in manufacturing equipment for tires or the like, a mechanism for measuring the extrusion volume must be provided in the manufacturing equipment in order to measure the volume of rubber extruded from the rubber constant-volume extrusion device; however, this cannot be measured while the equipment is in operation for production.

[0007] In addition, in manufacturing facilities, rubber extruded from a rubber constant-volume extrusion device may be extruded onto a rotating body such as a molding drum. In such cases, it is possible to measure the amount of rubber for each molding drum, but in order to measure the amount of rubber discharged with high accuracy, it is necessary to stop the facility and perform the measurement, which significantly reduces productivity.

[0008] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a method and an apparatus for monitoring the performance (quantitative capacity) of a rubber constant-volume extrusion device to stably extrude a predetermined amount of rubber without stopping the manufacturing equipment. [Means for solving the problem]

[0009] The quantitative capacity monitoring method of a rubber quantitative extrusion device of the present invention is a quantitative capacity monitoring method of a rubber quantitative extrusion device, which includes a first step of acquiring the mass of rubber material supplied to the rubber quantitative extrusion device, a second step of acquiring operation information of the rubber quantitative extrusion device required to extrude the rubber material, and a third step of calculating an extrusion efficiency calculated from the mass of the rubber material acquired in the first step and the operation information of the rubber quantitative extrusion device acquired in the second step.

[0010] The rubber constant-volume extrusion device of the present invention is a rubber constant-volume extrusion device having a gear pump which has a pair of gears which rotate in mesh with each other and which sends out rubber supplied from a supply unit to the outside, and is equipped with a rotation speed detection unit which detects the number of rotations of the gear, a supply amount detection unit which detects the mass of rubber supplied to the supply unit, a calculation unit which calculates the ratio (G1 / G) between an actual value G1 of the supply amount of rubber taken into the gear pump per rotation of the gear and a theoretical value G of the supply amount of rubber taken into the gear pump per rotation of the gear from the detection value of the rotation speed detection unit and the detection value of the supply amount detection unit, and a prediction unit which predicts the life of the gear pump based on the ratio (G1 / G) calculated by the calculation unit.

[0011] The rubber quantitative extrusion device of the present invention is a rubber quantitative extrusion device having an extruder with a screw that kneads rubber supplied from a supply section into a barrel and sends it out to the tip side of the barrel, and is equipped with a rotation speed detection unit that detects the number of rotations of the screw, a supply amount detection unit that detects the mass of rubber supplied to the supply section, a calculation unit that calculates the ratio (S1 / S) between an actual value S1 of the supply amount of rubber taken into the screw per rotation of the screw and a theoretical value S of the supply amount of rubber taken into the extruder per rotation of the screw from the detection value of the rotation speed detection unit and the detection value of the supply amount detection unit, and a prediction unit that predicts the life of the screw based on the ratio (S1 / S) calculated by the calculation unit. Effect of the Invention

[0012] In the above-mentioned invention, the quantitative performance of the rubber quantitative extrusion device can be monitored without stopping the production of tires or the like or reducing productivity. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic diagram showing a tire component manufacturing facility to which a method for monitoring the quantitative capacity of a rubber quantitative extrusion device according to a first embodiment of the present invention is applied. [Diagram 2] FIG. 1 shows a schematic configuration of a measuring section and a molding section. [Diagram 3] Block diagram showing the configuration of the control unit [Figure 4] Flow diagram showing the procedure for monitoring the quantitative capacity of a rubber quantitative extrusion device [Diagram 5] FIG. 11 is a diagram showing the relationship between the operation amount and the discharge efficiency η of a gear pump. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this embodiment, a tire component manufacturing facility 1 is provided with an extruder and a gear pump as a rubber constant-volume extrusion device, and a case where the constant-volume extrusion capacity of a gear pump 64 provided in a molding section 6 is monitored will be described as an example.

[0015] As shown in FIG. 1, a tire constituent member manufacturing facility 1 is composed of a material kneading section 2, a material preparation section 3, a measuring section 5, a molding section 6, and a control section 10.

[0016] The material kneading section 2 is provided with an extruder 21 having a supply section 22, a barrel 23, a screw 24, a die section 25 and a motor 26, and kneads the rubber composition to produce a long rubber material R1.

[0017] In the extruder 21, a rubber material obtained by kneading a rubber composition and additives in a kneader (not shown) is supplied from a supply section 22 to the inside of a barrel 23. The rotation speed of a motor 26 is controlled by the control section 10 to rotate a screw 24 at a predetermined rotation speed. As a result, the rubber material supplied to the inside of the barrel 23 is further kneaded by the screw 24 connected to the drive shaft of the motor 26, and then a long rubber material R1 is extruded from a nozzle section 25 at the tip of the barrel 23.

[0018] The rubber material R1 extruded from the nozzle unit 25 is placed on a flat pallet 27 and transported to the material preparation unit 3. The rubber material R1 extruded from the nozzle unit 25 may have any shape, but is preferably in the form of a wide sheet, for example.

[0019] The material preparation section 3 includes an extruder 31, a treatment tank 40, a drying and conveying section 41, and a cart 42, and performs secondary processing on the rubber material R1 produced in the material kneading section 2.

[0020] The extruder 31 includes a supply section 32, a barrel 33, a screw 34, a die section 35, and a motor 36, similar to the extruder 21 described above. The rubber material R1 placed on the pallet 27 is supplied from the supply section 32 to the inside of the barrel 33 of the extruder 31. In the extruder 31, the motor 36 controlled by the control section 10 rotates the screw 34 at a predetermined rotation speed. As a result, the rubber material R1 supplied to the inside of the barrel 33 is further kneaded by the screw 34, and then a long rubber material R2 is extruded from the die section 35 at the tip of the barrel 33. The shape of the rubber material R2 extruded from the die section 35 may be any shape, but it is preferable that the cross section has a thick flat shape such as an ellipse or a rectangle from the viewpoint of stability during transportation.

[0021] The treatment tank 40 is a liquid tank containing a release agent liquid or the like, which is provided downstream of the nozzle portion 35 of the extruder 31. The rubber material R2 extruded from the extruder 31 is immersed in the release agent liquid or the like in the treatment tank 40 and is discharged in a state in which the surface of the rubber material R2 is treated.

[0022] The drying and conveying section 41 is provided after the treatment tank 40, and dries the rubber material R2 having the release agent liquid and the like attached thereto by air blown from a blower 48 while conveying the rubber material R2.

[0023] The cart 42 includes a roll 43 having flanges at both ends in the axial direction and a support frame 44 that rotatably supports the roll 43. The rubber material R2 dried in the drying and conveying section 41 is wound up by the roll 43, and a predetermined amount of the rubber material R2 is held. The support frame 44 of the cart 42 is provided with an RFID tag 45 for storing information about the cart 42 and the mass W of the rubber material R2 supported by the cart 42. The cart 42 holding the rubber material R2 is installed on the cart fixing section 61 of the molding section 6 via the weighing section 5. The RFID tag 45 stores information about the cart 42 including ID information for identifying the cart 42, and may also store information such as the date and time when the mass W of the rubber material R2 was measured, the type of the rubber material R2, and the lot number, as necessary.

[0024] The weighing unit 5 is provided with a weighing sensor 51 that measures the mass of the trolley 42 holding the rubber material R2, and an RFID read / writer 52 that performs non-contact communication with an RFID tag 45 provided on the support frame 44 of the trolley 42. The weighing sensor 51 and the RFID read / writer 52 are connected to the control unit 10, and the detection result of the weighing sensor 51 is transmitted to the control unit 10. In accordance with an instruction from the control unit 10, the RFID read / writer 52 reads information about the trolley 42 whose mass has been measured in the weighing unit 5 from the RFID tag 45 of the trolley 42, and writes and stores the mass W of the rubber material R2 held by the trolley 42 in the RFID tag 45.

[0025] As shown in Figures 1 and 2, the molding section 6 includes a cart fixing section 61, a rubber drawing device 62, an extruder 63, a gear pump 64, and a molding drum 65, and by supplying the rubber strip S extruded from the gear pump 64 to the rotating molding drum 65, a rubber component that constitutes a pneumatic tire is molded onto the outer peripheral surface of the molding drum 65.

[0026] The cart fixing unit 61 is provided with a cart detection unit 66 that detects the placement of the cart 42 whose mass has been measured by the weighing unit 5, and an RFID read / writer 67 that performs non-contact communication with the RFID tag 45 of the cart 42 placed on the cart fixing unit 61. The cart detection unit 66 and the RFID read / writer 67 are connected to the control unit 10, and when the cart detection unit 66 detects the placement of the cart 42, the RFID read / writer 67 reads the mass W of the rubber material R2 stored in the RFID tag 45 of the cart 42 in accordance with an instruction from the control unit 10, and transmits the read mass W of the rubber material R2 to the control unit 10.

[0027] The rubber drawing device 62 draws out the rubber material R2 from the carriage 42 installed on the carriage fixing portion 61 and supplies it to the supply portion 72 of the extruder 63.

[0028] The extruder 63 has a cylindrical barrel 73, a screw 74 that kneads the rubber material R2 supplied from the supply unit 72 and sends it out to the tip side (the gear pump 64 side), and a motor 76 that rotates the screw 74, and together with the gear pump 64, constitutes a rubber constant-amount extrusion device. The motor 76 controlled by the control unit 10 rotates the screw 74, so that the extruder 63 supplies the rubber supplied from the supply unit 72 to the inside of the barrel 73 to the inlet side of the gear pump 64 while kneading it.

[0029] The gear pump 64 is connected to the tip side of the extruder 63 in the extrusion direction, and includes a pair of gears 77 that mesh with each other and rotate, a casing 79 provided with a gear chamber 78 that houses the pair of gears 77, and a nozzle unit 80. The pair of gears 77 are each driven to rotate by a gear motor 83, and their rotation speeds are controlled by the control unit 10.

[0030] In the casing 79, an inlet side chamber 81 is provided between the gear chamber 78 and the extruder 63, and an outlet side chamber 82 is provided between the gear chamber 78 and a nozzle portion 80. When the pair of gears 77 disengage from each other, the gear pump 64 causes the rubber supplied to the inlet side chamber 81 from the extruder 63 to enter the grooves, and sends the rubber out to the outlet side chamber 82 by the rotation of the gear 77.

[0031] The nozzle portion 80 is provided with a discharge port of a predetermined cross-sectional shape, and the rubber fed from the gear pump 64 is discharged from the discharge port to the outside to continuously extrude and mold the rubber strip S. The rubber strip S extruded from the nozzle portion 80 is ribbon-shaped with a small width and thickness, and various sizes can be used depending on the rubber material to be molded on the outer circumferential surface of the molding drum 65. The cross-sectional shape of the rubber strip S is not limited to a specific one, and various and preferable shapes can be used depending on the finished cross-sectional shape, such as a triangle, a crescent, a circle, or a rectangle.

[0032] The control unit 10 is configured to include a microcomputer and storage devices such as memory, and as shown in FIG. 3, is connected to the motors 26, 36, 76 of the extruders 21, 31, 63, the gear motor 83 of the gear pump 64, the building drum 65, the weighing sensor 51, the RFID read / writers 52, 67, a cart detection unit 66, and an input unit 68 such as a keyboard, and controls the manufacturing equipment 1 for tire components.

[0033] The control unit 10 functions as an operation amount acquisition unit and a rotation number detection unit, and acquires, as operation information of the gear pump 64, an integrated value (operation amount) of the actual operation time of the gear pump 64 from the start of operation of a new gear pump 64 to the present, and the number of rotations of the gear 77. The control unit 10 also functions as a calculation unit that detects the ratio η (=G1 / G, hereinafter referred to as discharge efficiency η) of an actual measured value G1 of the amount of rubber supplied to the gear pump 64 per one rotation of the gear 77 to a theoretical value G, and a prediction unit that predicts the life of the gear pump 64 based on the discharge efficiency η.

[0034] Next, the control in the case where the control unit 10 monitors the quantitative capacity of the gear pump 64 provided in the molding unit 6 will be described.

[0035] First, when the detection result of the mass of the trolley 42 holding the rubber material R2 is transmitted from the weighing sensor 51, the control unit 10 controls the RFID read / writer 52 to read information about the trolley 42 from the RFID tag 45 of the trolley 42, and obtains the mass of the trolley 42 itself (i.e., the mass of the trolley 42 when it is not holding the rubber material R2).

[0036] The mass of the trolley 42 itself may be obtained by storing the mass of the trolley 42 itself in the RFID tag 45 of the trolley 42 and reading it by the RFID read / writer 52. Alternatively, ID information for identifying the trolley 42 and the mass of the trolley 42 itself may be stored in a storage device possessed by the control unit 10 in association with each other, the ID information of the trolley 42 may be obtained by the RFID read / writer 52, and the mass of the trolley 42 corresponding to the obtained ID information may be obtained from the storage device.

[0037] The control unit 10 calculates the mass W of the rubber material R2 held by the cart 42 by subtracting the mass of the cart 42 itself from the mass of the cart 42 holding the rubber material R2, and stores the calculated mass W in the RFID tag 45 via the RFID read / writer 52.

[0038] Then, when the cart 42 is placed on the cart fixing portion 61 of the molding section 6, the control section 10 operates the extruder 63, the gear pump 64 and the molding drum 65 to start molding the rubber material onto the outer peripheral surface of the molding drum 65, and also starts monitoring the quantitative capacity of the gear pump 64.

[0039] Specifically, as shown in FIG. 4, when the cart detection unit 66 of the molding unit 6 detects the placement of the cart 42 (Yes in step S1), in accordance with instructions from the control unit 10, the RFID read / writer 67 reads the mass W of the rubber material R2 stored in the RFID tag 45 of the cart 42, and transmits the read mass W of the rubber material R2 to the control unit 10 (step S2).

[0040] Then, the control unit 10 stores the mass W of the rubber material R2 in a storage device (step S3), and then drives the motor 76 of the extruder 63, the gear motor 83 of the gear pump 64, and the molding drum 65 to supply the rubber strip S extruded from the nozzle portion 80 to the rotating molding drum 65 (step S4).

[0041] When the control unit 10 starts the gear motor 83 of the gear pump 64, it starts counting the number of rotations of the gear 77, and continues counting the number of rotations of the gear 77 until the rubber material R2 held by the cart 42 runs out and molding of the rubber member is completed. In addition, the control unit 10 integrates the actual operating time of the gear pump 64 from the time when the operation of the new gear pump 64 started to the present, and stores this integrated value of the actual operating time in the storage device as the operating amount of the gear pump 64 (step S5).

[0042] Then, when the rubber material R2 held by the cart 42 runs out (Yes in step S6), the control unit 10 stops the motor 76 of the extruder 63, the gear motor 83 of the gear pump 64, and the molding drum 65. The control unit 10 also calculates the actual value G1 (=W / r) of the supply amount of rubber taken into the gear pump 64 per one rotation of the gear 77 from the number of rotations r of the gear 77 until the rubber material R2 held by the cart 42 is used up and the mass W of the rubber material R2 acquired in step S2, and calculates the discharge efficiency η (=G1 / G) of the actual value G1 of the supply amount relative to the theoretical value G of the supply amount of rubber taken into the gear pump 64 per one rotation of the gear 77.

[0043] The theoretical value G of the rubber supply amount corresponds to the rubber extruded from the gear pump 64 per one rotation of the gear 77. In other words, if the theoretical value of the volume of the rubber extruded from the gear pump 64 per one rotation of the gear 77 is (volume) C, and the density of the rubber supplied to the gear pump 64 is ρ, the theoretical value of the discharge amount of the rubber extruded from the gear pump 64 per one rotation of the gear 77 can be calculated from the following formula (2), and this theoretical value of the discharge amount of the rubber is the theoretical value G of the rubber supply amount. Therefore, the discharge efficiency η can be calculated from the following formula (3) based on the mass W of the rubber material R2, the gear capacity C, the number of rotations r of the gear 77, and the density ρ of the rubber. The gear capacity C is a value determined from the shape of the gear 77 and the gear chamber 78 of the gear pump 64, and can be appropriately set from the input unit 19 together with the density ρ of the rubber.

[0044] G1=W / r formula (1) G =C×ρ Equation (2) η=G1 / G=W / (C×r×ρ) Equation (3) The control unit 10 stores the calculated discharge efficiency η in association with the operation amount of the gear pump 64 stored in the storage device by the control unit 18 at the time when the discharge efficiency η is calculated (step S7).

[0045] 5, the control unit 10 calculates an approximation function F that indicates the relationship between the discharge efficiency η calculated so far and the operation amount of the gear pump 64, and calculates the operation amount of the gear pump 64 when the discharge efficiency η reaches a predetermined reference value ηth or less from the calculated approximation function. The control unit 18 predicts the life of the gear pump 64 by determining the integrated value of the actual operation time of the gear pump 64 when the discharge efficiency η reaches a predetermined reference value ηth or less as the time to replace or repair the gear pump 64 (step S8).

[0046] The approximation function F indicating the relationship between the discharge efficiency η and the operation amount of the gear pump 64 may be either a linear function or a curved function. The reference value ηth of the discharge efficiency η can be appropriately set from the input unit 19.

[0047] In the present embodiment as described above, since the life of the gear pump 64 is predicted from the discharge efficiency η calculated based on the mass W of the rubber material R2 supplied to the supply section 72 of the extruder 63 and the rotation speed r of the gear 77, the mass of the rubber material R2 can be measured before the rubber material R2 is supplied to the supply section 72, and the mass of the rubber material R2 to be supplied to the supply section 72 can be measured with high accuracy without impairing the productivity of the manufacturing equipment. As a result, the quantitative capacity of the gear pump 64 can be monitored without impairing the productivity of the manufacturing equipment 1 for tire constituent members.

[0048] In this embodiment, the mass of the rubber material R2 is measured while the cart 42 holds the rubber material R2, so that the rubber material R2 can be easily handled. Moreover, the rubber material R2 often waits for a certain period of time in a predetermined storage location while being held by the cart 42 until it is supplied to the supply unit 72 of the extruder 63, so that it is easy to secure space and time for measuring the mass of the rubber material R2. Therefore, the method of this embodiment can be easily applied not only to the case where the manufacturing equipment 1 is newly installed, but also to the existing manufacturing equipment 1.

[0049] Furthermore, in this embodiment, the mass of the rubber material R2 held on the cart 42 is stored in the RFID tag 45 provided on the cart 42. Therefore, even if the control unit 10 is not in communication between the weighing unit 5 and the molding unit 6, the mass W of the rubber material R2 measured in the weighing unit 5 can be easily transferred to the molding unit 6. Furthermore, since the recording means (in this embodiment, an RFID tag) is fixed to the winding cart so that the rubber material cannot easily be detached from the cart once it has been held, a mismatch between the rubber material once wound up and the mass data obtained after winding is extremely unlikely to occur.

[0050] Although the embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This new embodiment can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims.

[0051] For example, in the above embodiment, the life of the gear pump 14 is predicted by monitoring the quantitative capacity of the gear pump 64 based on the discharge efficiency η of the gear pump 64. However, the monitoring results of the quantitative capacity of the gear pump 64 can be utilized for various controls of the manufacturing equipment 1 for tire components, such as changing the rotational speed of the gear 77 using the calculated discharge efficiency η to compensate for the decrease in the amount of rubber extruded from the gear pump 64.

[0052] In addition, in the above embodiment, the quantitative capacity of the gear pump 64 provided in the molding section 6 is monitored. However, the quantitative capacity of each of the extruders 21, 31 provided in the material mixing section 2 and the extruder 31 provided in the material preparation section 3 may also be monitored based on the rubber material supplied to the supply sections 22, 32 and the number of rotations of the screws 24, 34.

[0053] For example, when monitoring the quantitative capacity of the extruder 31 provided in the material preparation section 3, the mass of rubber material R1 supplied to the supply section 32 of the extruder 31 is measured for each pallet 27, and the actual value S1 (=W1 / r1) of the amount of rubber supplied to the extruder 31 per rotation of the screw 34 is calculated from the measurement result W1 and the number of rotations r1 of the screw 34 of the extruder 31 until the rubber material R1 held by the pallet 27 is used up.In addition, the discharge efficiency (S1 / S) of the actual supply amount S1 relative to the theoretical value S of the amount of rubber supplied to the extruder 31 per rotation of the screw 34 is calculated, and the life of the extruder 31 can be predicted from the calculated discharge efficiency and the operating amount of the extruder 31.

[0054] In addition, in the above-described embodiment, the mass W of the rubber material R2 calculated by the control unit 10 is stored in the RFID tag 45 provided on the trolley 42, and the control unit 10 obtains the mass W of the rubber material R2 held by the trolley 42 installed on the trolley fixing portion 61 by reading this using the RFID read / writer 67. In addition to this method, ID information identifying the trolley 42 and the mass W of the rubber material R2 held by the trolley 42 may be linked and stored in a memory device possessed by the control unit 10, the ID information of the trolley 42 may be acquired using the RFID read / writer 67, and the mass W of the rubber material R2 held by the trolley 42 corresponding to the acquired ID information may be acquired from the memory device. Alternatively, a barcode may be provided on the trolley 42 instead of the RFID tag 45, and this may be read by a barcode reader provided in the weighing unit 5 and the trolley fixing unit 61, thereby linking the mass W of the rubber material R2 obtained in the weighing unit 5 to the ID information of the trolley 42 and acquiring the mass W of the rubber material R2 held by the trolley 42 corresponding to the ID information acquired in the trolley fixing unit 61 from the memory device.

[0055] In the above embodiment, the ratio of the actual value G1 of the amount of rubber fed into the gear pump 64 or the extruder 31 per one rotation of the gear 77 or the screw 34 to the theoretical value is used as the discharge efficiency, but various mechanical efficiencies can be used as the discharge efficiency. For example, the mechanical efficiency (energy efficiency) obtained by dividing the power E required by the gear pump 64 or the extruder 31 until the rubber material held by the cart 42 or the pallet 27 is used up by the mass or volume of the rubber material held by the cart 42 or the pallet 27, or the mechanical efficiency obtained by dividing the mass or volume of the rubber material held by the cart 42 or the pallet 27 by the number of rotations of the gear 77 or the screw 34 until the rubber material held by the cart 42 or the pallet 27 is used up may be used as the discharge efficiency. [Explanation of symbols]

[0056] Reference Signs List 1...Manufacturing equipment for tire components, 2...Material mixing section, 3...Material preparation section, 5...Measuring section, 6...Molding section, 10...Control section, 21...Extruder, 22...Supply section, 31...Extruder, 32...Supply section, 42...Cart, 43...Roll, 44...Support frame, 45...RFID tag, 51...Weight sensor, 52...RFID read / write, 61...Cart fixing section, 63...Extruder, 64...Gear pump, 65...Molding drum, 66...Cart detection section, 67...RFID read / write, 72...Supply section, 73...Barrel, 74...Screw, 76...Motor, 77...Gear, 78...Gear chamber, 79...Casing, 80...Jet section, 81...Inlet side chamber, 82...Outlet side chamber, 83...Gear motor

Claims

1. A rubber constant-volume extrusion device having a gear pump which has a pair of gears which rotate in mesh with each other and which sends out rubber supplied from a supply section to the outside, A rotation number detection unit that detects the number of rotations of the gear; A supply amount detection unit that detects the mass of the rubber supplied to the supply unit; a calculation unit that calculates a ratio (G1 / G) between an actual value G1 of the amount of rubber supplied to the gear pump per one rotation of the gear and a theoretical value G of the amount of rubber supplied to the gear pump per one rotation of the gear from a detection value of the rotation speed detection unit and a detection value of the supply amount detection unit; A rubber constant-volume extrusion device comprising: a prediction unit that predicts the service life of the gear pump based on the ratio (G1 / G) calculated by the calculation unit.

2. A carriage for holding rubber to be supplied to the gear pump; An RFID tag that is provided on the cart and capable of non-contact communication with an external device and stores the mass of the rubber held by the cart; a reading unit capable of non-contact communication with the RFID tag and reading a mass of the rubber held by the dolly from the RFID tag; The rubber constant-quantity extrusion device according to claim 1 , wherein the calculation unit calculates an actual measurement value G1 of the amount of rubber supplied from the mass of the rubber acquired by the reading unit.

3. A rubber constant-quantity extrusion device having an extruder having a screw that kneads rubber supplied from a supply section into a barrel and delivers the rubber to a tip end of the barrel, A rotation number detection unit that detects the number of rotations of the screw; A supply amount detection unit that detects the mass of the rubber supplied to the supply unit; a calculation unit that calculates a ratio (S1 / S) between an actual value S1 of the amount of rubber fed into the screw per one rotation of the screw and a theoretical value S of the amount of rubber fed into the extruder per one rotation of the screw from a detection value of the rotation speed detection unit and a detection value of the feed amount detection unit; A rubber constant-volume extrusion device comprising: a prediction unit that predicts the life of the screw based on the ratio (S1 / S) calculated by the calculation unit.

4. A cart for holding rubber to be supplied to the extruder; An RFID tag that is provided on the cart and capable of non-contact communication with an external device and stores the mass of the rubber held by the cart; a reading unit capable of non-contact communication with the RFID tag and reading a mass of the rubber held by the dolly from the RFID tag; The rubber constant-quantity extrusion device according to claim 3 , wherein the calculation unit calculates an actual measurement value S1 of the amount of rubber supplied from the mass of the rubber acquired by the reading unit.

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