PU (polyurethane) reaction kettle capable of conveniently controlling viscosity

Abstract

The utility model discloses a PU (polyurethane) reaction kettle capable of conveniently controlling viscosity, which comprises a kettle body, a stirring device is arranged in the kettle body, the stirring device is driven to rotate by a stirring motor positioned outside the kettle body, the stirring motor is a variable frequency motor, the variable frequency motor comprises a frequency converter, the frequency converter is connected with a Hall sensor, the Hall sensor is connected with a PLC (programmable logic controller), and the PLC is connected with the stirring device. The stirring device comprises a hollow pipe, a stirring shaft and stirring blades, a sampling pipe is inserted into the hollow pipe, and a plurality of side openings sequentially communicated with the interior of the sampling pipe are formed in the side face of the sampling pipe. According to the PU reaction kettle capable of conveniently controlling the viscosity, the current change of the stirring motor in the stirring mechanism is sensed in real time through the Hall sensor, so that the viscosity change condition of a PU material in the PU reaction kettle is indirectly obtained. And the viscosity of the PU material is measured through online sampling of the sampling pipe, so that the accurate control on the viscosity of the PU material in the PU reaction kettle is realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to PU reaction kettle technical field, concretely relates to the PU reaction kettle of convenient control viscosity. BACKGROUND

[0002] The preparation process of polyurethane (PU) usually includes the synthesis of low molecular weight prepolymer, the chain extension reaction of prepolymer and crosslinking reaction. With the reaction, the molecular chain will crosslink, form three-dimensional network structure, thereby improving the strength, hardness and other properties of PU. The viscosity is an important process parameter in the reaction process, but it is difficult to monitor the viscosity in real time in the production process of material, and the sampling hole and sight glass are often opened on the reaction kettle to view the reaction process of material. However, the existing PU reaction kettle must be stopped for sampling, so that the reaction process in the PU reaction kettle cannot be accurately controlled, and there is a certain difference between the viscosity at the time of sampling and the actual viscosity. SUMMARY

[0003] To solve the above technical problems, the utility model adopts the technical scheme of: the PU reaction kettle of convenient control viscosity, including the kettle body, the inside installation of kettle body has the stirring device, the stirring device is driven rotation by the stirring motor located in the kettle body outside, the stirring motor is variable frequency motor, the variable frequency motor includes the frequency converter, the frequency converter is connected with the hall sensor, the hall sensor is connected with the PLC controller, the stirring device includes the hollow tube, the upper end of hollow tube is rotatably installed on the kettle cover of kettle body, the lower end of hollow tube is located in the kettle body and is fixedly connected with a plurality of cross beams, the both ends of cross beam are fixedly connected with the stirring shaft respectively, a plurality of stirring blades are fixedly connected on the stirring shaft, the sampling tube is inserted in the hollow tube, a plurality of side openings that are sequentially communicated with the inside of sampling tube are arranged on the side surface of sampling tube.

[0004] As the preferred of the above technical scheme, the upper end of hollow tube is fixedly connected with the driven gear after extending out of the kettle cover, the output shaft of stirring motor is fixedly connected with the driving gear, and the driving gear and the driven gear are in gear engagement.

[0005] As the preferred of the above technical scheme, the middle part of driven gear is provided with a central hole for the upper end of sampling tube to extend out, the upper end of sampling tube is fixedly connected with the flange after passing through the central hole, the inside of sampling tube is screwedly connected with the inner tube, a plurality of communication openings are arranged on one side of inner tube, and the communication openings correspond to the side openings.

[0006] As the preferred of the above technical scheme, the upper end of inner tube extends out of the sampling tube and is fixedly connected with the top end plate, the top end plate is provided with the air hole, the upper end of inner tube is screwedly connected with the cap, the cap is provided with the communication hole, and the communication hole is communicated with the air hole or avoids the air hole by rotating the cap, the lower end of sampling tube is provided with the discharge opening, and the lower end of inner tube is screwedly connected with the discharge cover plate.

[0007] As the preferred technical scheme of the above, the lower cover plate is provided with a lower rotating handle, the cap is fixedly connected with an upper rotating handle, the upper end of the inner tube is fixedly connected with a plurality of rotating rods after extending out of the sampling tube, and the rotating rods are connected with the circumferential surface of the inner tube.

[0008] As the preferred technical scheme of the above, the center hole is provided with a plurality of positioning grooves, the lower surface of the flange plate is provided with a plurality of positioning columns, the positioning columns correspond to the positioning grooves and are inserted into the corresponding positioning grooves.

[0009] The PU reaction kettle convenient for controlling viscosity has the advantages that the Hall sensor can be used to sense the current change of the stirring motor in the stirring mechanism in real time, so that the viscosity change of the PU material in the PU reaction kettle is indirectly obtained. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 is a structural schematic view of the utility model;

[0011] Fig. 2 is a sectional structure schematic view of the sampling tube. DETAILED DESCRIPTION

[0012] The technical scheme of the utility model will be described clearly and completely in combination with the drawings, obviously, the described embodiments are a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the protection scope of the utility model.

[0013] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0014] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "link", "connection" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through the intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to specific circumstances.

[0015] As Figs. 1-2 The utility model discloses a PU reaction kettle convenient for controlling viscosity, which comprises a kettle body 1, wherein a stirring device is arranged in the kettle body 1, the stirring device is driven to rotate by a stirring motor 2 located outside the kettle body 1, the stirring motor 2 is a variable frequency motor, the variable frequency motor comprises a frequency converter, the frequency converter is connected with a Hall sensor, the Hall sensor is connected with a PLC controller, the stirring device comprises a hollow pipe 3, the upper end of the hollow pipe 3 is rotatably arranged on a kettle cover 4 of the kettle body 1, the lower end of the hollow pipe 3 is located in the kettle body 1 and is fixedly connected with a plurality of cross beams 5, the two ends of each cross beam 5 are fixedly connected with a stirring shaft 6, a plurality of stirring blades 7 are fixedly connected to the stirring shaft 6, a sampling pipe 8 is inserted into the hollow pipe 3, and a plurality of side openings 9 that are sequentially connected with the inside of the sampling pipe 8 are arranged on the side surface of the sampling pipe 8. The Hall sensor can obtain the current of the variable frequency motor in real time, the viscosity of PU material in the kettle body 1 directly affects the rotating speed of the hollow pipe 3, and the viscosity change of the PU material can be directly obtained by the current change of the variable frequency motor. When the current of the variable frequency motor reaches the set value range, necessary temperature control means is used to control the reaction process of the kettle body 1 in time. The sampling pipe 8 is taken out, and PU material at each height in the kettle body 1 is sampled. After the accurate viscosity data is measured, the subsequent operation of the kettle body 1 is determined. Like the conventional kettle body 1, a heating device is arranged in the kettle body 1. The reaction temperature of the kettle body 1 is controlled by cooling water around the kettle body 1.

[0016] Further, the upper end of the hollow pipe 3 is fixedly connected with a driven gear 10 after extending out of the kettle cover 4, the output shaft of the stirring motor 2 is fixedly connected with a driving gear 11, and the driving gear 11 and the driven gear 10 are in gear engagement.

[0017] Further, the middle part of the driven gear 10 is provided with a central hole 12 for the upper end of the sampling pipe 8 to extend out, the upper end of the sampling pipe 8 is fixedly connected with a flange plate 13 after penetrating through the central hole 12, the inside of the sampling pipe 8 is threadedly connected with an inner pipe 14, one side of the inner pipe 14 is provided with a plurality of communication openings 15, and the communication openings 15 correspond to the side openings 9.

[0018] Further, the upper end of the inner tube 14 extends out of the sampling tube 8 and is fixedly connected with a top end plate 16, the top end plate 16 is provided with air holes 17, the upper end of the inner tube 14 is threadedly connected with a cap 18, the cap 18 is provided with a communication hole 19, rotating the cap 18 makes the communication hole 19 communicate with the air holes 17 or avoid the air holes 17, the lower end of the sampling tube 8 is provided with a discharging port 20, the lower end of the inner tube 14 is threadedly connected with a discharging cover plate 21. After rotating the cap 18 and making the communication hole 19 communicate with the air holes 17, the air in the inner tube 14 can be squeezed out due to the communication between the upper end of the inner tube 14 and the outside. Then the PU material is loaded into the inner tube 14 through the communication port 15 and the side opening 9 by rotating the sampling tube 8 together with the hollow tube 3. After sampling, the cap 18 is rotated to make the communication hole 19 avoid the air holes 17, so that even if the communication port 15 and the side opening 9 are in communication, the PU material will not flow out from the communication port 15 and the side opening 9. The inner tube 14 is rotated to make the communication port 15 and the side opening 9 not conductive. The sampling tube 8 is taken out, the discharging cover plate 21 is loosened first, and then the cap 18 is rotated to make the communication hole 19 communicate with the air holes 17, the PU material is discharged layer by layer, the viscosity is measured respectively, and thus the viscosity of the PU material at different heights in the kettle body 1 is obtained.

[0019] Further, the lower end of the discharging cover plate 21 is provided with a lower rotating handle 22, the cap 18 is fixedly connected with an upper rotating handle 23, the upper end of the inner tube 14 is fixedly connected with a plurality of rotating rods 24 after extending out of the sampling tube 8, and the rotating rods 24 are connected with the circumferential surface of the inner tube 14.

[0020] Further, a plurality of positioning grooves 25 are arranged around the central hole 12, and a plurality of positioning columns 26 are arranged on the lower surface of the flange plate 13, the positioning columns 26 correspond to the positioning grooves 25 and are inserted into the corresponding positioning grooves 25. After the positioning columns 26 are inserted into the positioning grooves 25, the sampling tube 8 can rotate together with the hollow tube 3, and during the rotation process, the viscous PU material is poured into the inner tube 14 through the communicated communication port 15 and side opening 9. After a period of sampling, the sampling tube 8 is pulled upwards, and the sampling tube 8 is taken out to complete the sampling. When sampling is not needed, the flange plate 13 can also cover the central hole 12.

[0021] It is worth mentioning that the variable frequency motor, the frequency converter, the Hall sensor, the PLC controller and other technical features involved in the utility model patent application should be regarded as prior art, the specific structure, working principle and possible control mode and spatial arrangement mode of these technical features can be selected by using the conventional selection in the field, and should not be regarded as the invention point of the utility model patent, and the utility model patent will not be further expanded and described in detail.

[0022] The preferred embodiments of the present application are described in detail above, it should be understood that those skilled in the art can make many modifications and changes without creative labor according to the conception of the present application, therefore, all the technical solutions obtained by logical analysis, reasoning or limited experiments on the basis of the prior art according to the conception of the present application by those skilled in the art should be within the protection scope determined by the claims.

Claims

1. A PU reactor for convenient viscosity control, characterized in that, The device includes a vessel body, inside which a stirring device is installed. The stirring device is driven to rotate by a stirring motor located outside the vessel body. The stirring motor is a variable frequency motor, which includes a frequency converter. The frequency converter is connected to a Hall sensor, which is connected to a PLC controller. The stirring device includes a hollow tube. The upper end of the hollow tube is rotatably mounted on the vessel lid of the vessel body. The lower end of the hollow tube is located inside the vessel body and is fixedly connected to several crossbeams. Both ends of the crossbeams are fixedly connected to stirring shafts. Several stirring blades are fixedly connected to the stirring shafts. A sampling tube is inserted into the hollow tube. The side of the sampling tube has several side openings that sequentially connect to the inside of the sampling tube.

2. The PU reactor for convenient viscosity control as described in claim 1, characterized in that, The upper end of the hollow tube extends out of the kettle lid and is fixedly connected to a driven gear. The output shaft of the stirring motor is fixedly connected to a driving gear, and the driving gear and the driven gear mesh.

3. The PU reactor for convenient viscosity control as described in claim 2, characterized in that, The driven gear has a central hole in the middle for the upper end of the sampling tube to extend out. The upper end of the sampling tube passes through the central hole and is fixedly connected to a flange. The sampling tube is threaded with an inner tube inside. Several connecting ports are provided on one side of the inner tube, and the connecting ports correspond to the side openings.

4. The PU reactor for convenient viscosity control as described in claim 3, characterized in that, The upper end of the inner tube extends out of the sampling tube and is fixedly connected to a top plate. The top plate is provided with a vent hole. The upper end of the inner tube is threadedly connected to a cap. The cap is provided with a connecting hole. Rotating the cap allows the connecting hole to connect with the vent hole or avoid the vent hole. The lower end of the sampling tube has a discharge port, and the lower end of the inner tube is threadedly connected to a discharge cover plate.

5. The PU reactor for convenient viscosity control as described in claim 4, characterized in that, The feeding cover is provided with a lower rotating handle, and the cap is fixedly connected with an upper rotating handle. After the upper end of the inner tube extends out of the sampling tube, several rotating rods are fixedly connected, and the rotating rods are connected to the circumferential surface of the inner tube.

6. The PU reactor for convenient viscosity control as described in claim 5, characterized in that, The center hole is surrounded by several positioning grooves, and the lower surface of the flange is provided with several positioning pins. The positioning pins correspond to the positioning grooves and are inserted into the corresponding positioning grooves.

Images