Oil heating internal mixer for polymer heating PTC (Positive Temperature Coefficient)

Abstract

The invention discloses an oil heating internal mixer for a polymer heating PTC (Positive Temperature Coefficient). The oil heating internal mixer comprises a fixed base, wherein a pressing seat capable of being movably pressed into a hopper is fixedly mounted at the lower end of a pressing push rod; an interlayer cavity is formed in the hopper, a first oil inlet pipe is vertically installed in the center of the bottom of the hopper, the upper end of the first oil inlet pipe extends to the position, protruding upwards, of the center in the interlayer cavity, and inclined guide plates symmetrically fixed to the inner wall of the hopper front and back are arranged at the positions, located on the front face and the back face of the first oil inlet pipe, in the interlayer cavity. And the left-right inclination directions of two front-back adjacent groups in the inclined guide plates are opposite. The interlayer cavity is formed in the hopper, the inner cavity is formed in the pressing seat, and circulating heat conduction oil is injected into the interlayer cavity and the inner cavity for heating, so that the purpose of uniformly heating the hopper and the pressing seat is achieved, the hopper and the pressing seat can uniformly heat macromolecular PTC (Positive Temperature Coefficient) internally mixed in the hopper, and more uniform internal mixing is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of polymer exothermic PTC production equipment, in particular to an oil-heating internal mixer for polymer exothermic PTC. Background Art

[0002] PTC (Positive Temperature Coefficient) material is a semiconductor heating ceramic material. When the external temperature decreases, the resistance value of PTC decreases, and the heat generation will increase accordingly. It is often used in the production and processing of heating cables.

[0003] The heating core of the heating cable is a polymer heating PTC. During production, the raw materials need to be plasticized and mixed in an internal mixer until they are mixed to the degree that meets the heating core. However, most of the internal mixers on the market currently use electric heating. The resistance wires in the hopper and the pressure seat cannot be installed closely and can only be installed at intervals. Therefore, there are high and low temperature zones during heating. The heating uniformity can meet the requirements of the internal mixing of ordinary plastics, but for the internal mixing of polymer heating PTC, the uniformity is affected, which affects the quality of the heating cable products and is insufficient. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an oil-heated internal mixer for polymer heat-generating PTC, which is used to solve the problem that most internal mixers on the market have high and low temperature zones during heating, which affects the uniformity of polymer heat-generating PTC internal mixing.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] An oil-heating internal mixer for polymer heat-generating PTC, comprising a fixed base, a hopper rotatably mounted on the fixed base, and a driving mechanism and a fixed frame fixedly mounted on the fixed base, wherein the driving mechanism is in transmission connection with two rotors rotatably mounted inside the hopper, a downward pressing push rod located directly above the hopper is fixedly mounted on the fixed frame, and a pressing seat that can be movably pressed into the hopper is fixedly mounted on the lower end of the downward pressing push rod;

[0007] The hopper is provided with an interlayer cavity, an oil inlet pipe is vertically installed in the center of the bottom of the hopper, and the upper end of the oil inlet pipe extends to the central upwardly protruding position inside the interlayer cavity, and inclined guide plates are symmetrically fixed to the inner wall of the hopper at the front and back positions of the oil inlet pipe in the interlayer cavity, and the two groups of inclined guide plates adjacent to each other in the front and back are inclined in opposite directions, a flow limiting baffle fixed to the inner wall of the hopper is horizontally provided at the position above the inclined guide plate in the interlayer cavity, and an oil outlet pipe is fixed to the back of the hopper in the middle above the flow limiting baffle.

[0008] The pressure seat is provided with an inner cavity, and a second flow limiting baffle is horizontally fixedly connected to the inner cavity, and through grooves are provided in the middle of the front and back sides of the second flow limiting baffle, and a vertical flow guide plate arranged longitudinally is fixed below the second flow limiting baffle. An oil inlet pipe and an oil outlet pipe located on the front and back sides of the downward push rod are fixedly installed on the top of the pressure seat, and the oil outlet end of the second oil inlet pipe passes through the second flow limiting baffle and extends to the center of the downward protruding position in the middle of the inner cavity, and the oil inlet end of the second oil outlet pipe extends to the central position of the top of the inner cavity;

[0009] The ends of the oil inlet pipe 1, the oil inlet pipe 2, the oil outlet pipe 1 and the oil outlet pipe 2 are all equipped with adapters, and the adapters are connected to the thermal oil circulation heater through a connecting hose.

[0010] Preferably, the wall thickness of the hopper and the pressure seat is not less than 1.5 cm.

[0011] Preferably, both ends of the inclined guide plate are fixedly connected to the inner wall of the hopper corresponding to the interlayer cavity, and the inclined guide plates are arranged equidistantly in the transverse direction.

[0012] Preferably, the top and bottom of the vertical guide plates are fixedly connected to the lower surface of the second flow limiting baffle and the bottom of the inner wall of the pressure seat respectively, and the vertical guide plates are equidistantly arranged in the transverse direction.

[0013] Preferably, the front and back sides of the vertical guide plate extend to positions corresponding to the through grooves, and a gap of half the depth of the protrusion is provided between the bottom of the vertical guide plate and the downwardly protruding position in the middle of the inner cavity.

[0014] Preferably, the flow limiting baffle plate 1 is arranged on the back side and both sides of the interlayer cavity, and the flow limiting baffle plate 1 is fixed on the inner walls of the hopper corresponding to the back side and both sides of the interlayer cavity.

[0015] Preferably, the distance between the opposite surfaces of the flow limiting baffles 1 on both sides of the interlayer cavity and the side walls of the hopper at the corresponding position close to the inner side is twice the distance between the front surface of the flow limiting baffle 1 on the back side of the interlayer cavity and the inner wall of the hopper at the corresponding position.

[0016] Preferably, a sealing shaft seat for mounting the rotor is installed on both the inner wall and the outer wall of the hopper.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present invention provides an interlayer cavity in the hopper, an inner cavity in the press seat, and cooperates with a heat transfer oil circulation heater to heat the interlayer cavity and the inner cavity by injecting circulating heat transfer oil to achieve the purpose of uniformly heating the hopper and the press seat, so that the hopper and the press seat can uniformly heat the polymer PTC mixed in the hopper, ensuring more uniform mixing, thereby improving the quality of the polymer PTC raw material of the heating cable, and solving the problem that most of the internal mixers on the market have high and low temperature zones during heating, which affects the mixing uniformity of the polymer heating PTC.

[0019] (2) In the interlayer cavity of the present invention, an oil inlet pipe 1 is arranged at a central position, and hot oil is injected from the highest point. Inclined guide plates are symmetrically arranged on the front and back sides of the oil inlet pipe 1, and the left and right inclination directions of two adjacent groups of inclined guide plates are opposite. The heat transfer oil is output from the oil outlet pipe 1 on the upper back side, and under the action of the flow limiting baffle 1, the heat transfer oil flow at the position closest to the oil outlet pipe 1 is limited. The distance between the positions on both sides of the interlayer cavity and the oil outlet pipe 1 is moderate, and the heat transfer oil flow at this location is moderately limited. The distance between the front position of the interlayer cavity and the oil outlet pipe 1 is the farthest, and the heat transfer oil flow at this location is not limited, so that the heat transfer oil flows evenly forward and backward, left and right in the interlayer cavity, ensuring that the heat transfer oil heats all parts of the hopper evenly to the greatest extent.

[0020] (3) In the present invention, the oil outlet end of the oil inlet pipe 2 in the pressure seat is arranged at the central position, and hot oil is injected from the lowest point. The vertical guide plates are arranged equidistantly in the horizontal direction. The heat transfer oil is output from the oil inlet end of the oil outlet pipe 2 at the top center. Under the action of the flow limiting baffle 2, the heat transfer oil flows out evenly from the middle to the two sides, from the middle to the front and back, and from the bottom to the top, thereby ensuring that the heat transfer oil heats the lower surface of the pressure seat evenly to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0022] Figure 2 It is a side view of the internal structure of the hopper and the pressure seat of the present invention;

[0023] Figure 3 It is a side view of the internal structure of the pressure seat of the present invention;

[0024] Figure 4 A top view of a corresponding position of a current limiting baffle of the present invention;

[0025] Figure 5 A top view of a corresponding position of a vertical guide plate of the present invention;

[0026] Figure 6 It is a side view of the vertical guide plate of the present invention.

[0027] In the figure: 1. fixed base; 2. hopper; 201. interlayer cavity; 202. inclined guide plate; 203. flow limiting baffle 1; 3. driving mechanism; 4. fixed frame; 5. rotor; 6. push rod; 7. pressure seat; 701. inner cavity; 702. flow limiting baffle 2; 703. through groove; 704. vertical guide plate; 8. oil inlet pipe 1; 9. oil outlet pipe 1; 10. oil inlet pipe 2; 11. oil outlet pipe 2; 12. adapter; 13. sealing shaft seat. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figure 1-6 As shown, the present invention provides a technical solution: an oil heating internal mixer for polymer heating PTC, comprising a fixed base 1, a hopper 2 rotatably mounted on the fixed base 1, and a driving mechanism 3 and a fixing frame 4 fixedly mounted on the fixed base 1, the driving mechanism 3 is drivingly connected with two rotors 5 rotatably mounted inside the hopper 2, a sealing shaft seat 13 for mounting the rotor 5 is mounted on the inner wall and the outer wall of the hopper 2, a downward pressing push rod 6 located directly above the hopper 2 is fixedly mounted on the fixing frame 4, and a pressing seat 7 that can be movably pressed into the hopper 2 is fixedly mounted on the lower end of the downward pressing push rod 6;

[0030] An interlayer cavity 201 is provided in the hopper 2, an oil inlet pipe 8 is vertically installed in the center of the bottom of the hopper 2, and the upper end of the oil inlet pipe 8 extends to the central upwardly protruding position inside the interlayer cavity 201, and inclined guide plates 202 are symmetrically fixed on the inner wall of the hopper 2 at the front and back positions of the oil inlet pipe 8 in the interlayer cavity 201, and the two groups of inclined guide plates 202 adjacent to each other in the front and back are inclined in opposite directions, both ends of the inclined guide plates 202 are fixedly connected to the inner wall of the interlayer cavity 201 corresponding to the hopper 2, and the inclined guide plates 202 are equidistantly arranged in the transverse direction;

[0031] A flow limiting baffle 203 fixed on the inner wall of the hopper 2 is horizontally arranged at a position above the inclined guide plate 202 in the interlayer cavity 201. The flow limiting baffle 203 is arranged on the back and both sides of the interlayer cavity 201, and the flow limiting baffle 203 is fixed on the inner walls of the hopper 2 corresponding to the back and both sides of the interlayer cavity 201. The distance between the opposite surfaces of the flow limiting baffles 203 on both sides of the interlayer cavity 201 and the side walls of the hopper 2 at the corresponding position close to the inner side is twice the distance between the front of the flow limiting baffle 203 on the back of the interlayer cavity 201 and the inner wall of the hopper 2 at the corresponding position. An oil outlet pipe 9 is fixed on the back of the hopper 2 in the middle above the flow limiting baffle 203;

[0032] An inner cavity 701 is provided inside the pressure seat 7, and the wall thickness of the hopper 2 and the pressure seat 7 is not less than 1.5 cm. A second flow limiting baffle 702 is horizontally fixedly connected inside the inner cavity 701, and a through groove 703 is provided in the middle of the front and back of the second flow limiting baffle 702. A vertical guide plate 704 arranged longitudinally is fixed below the second flow limiting baffle 702. The top and bottom of the vertical guide plate 704 are respectively fixedly connected to the lower surface of the second flow limiting baffle 702 and the bottom of the inner wall of the pressure seat 7, and the vertical guide plates 704 are equidistantly arranged in the horizontal direction, and the front and back of the vertical guide plates 704 extend to the position corresponding to the through groove 703, and a gap of half the depth of the protrusion is provided between the bottom of the vertical guide plate 704 and the downward protruding position of the middle part of the inner cavity 701;

[0033] An oil inlet pipe 10 and an oil outlet pipe 11 are fixedly installed on the top of the pressure seat 7, which are located on the front and back sides of the downward push rod 6. The oil outlet end of the oil inlet pipe 10 passes through the flow limiting baffle 702 and extends to the center of the downward protruding position in the middle of the inner cavity 701. The oil inlet end of the oil outlet pipe 11 extends to the central position of the top of the inner cavity 701. The ends of the oil inlet pipe 8, the oil inlet pipe 10, the oil outlet pipe 9 and the oil outlet pipe 11 are all installed with adapters 12, and the adapter 12 is connected to the thermal oil circulation heater through a connecting hose.

[0034] Working principle:

[0035] By setting an interlayer cavity 201 in the hopper 2 and an inner cavity 701 in the press seat 7, and using a heat transfer oil circulation heater, the purpose of uniformly heating the hopper 2 and the press seat 7 is achieved by injecting circulating heat transfer oil into the interlayer cavity 201 and the inner cavity 701 for heating, so that the hopper 2 and the press seat 7 can uniformly heat the polymer PTC mixed in the hopper 2, ensuring more uniform mixing;

[0036] Among them, the oil inlet pipe 8 in the interlayer cavity 201 is set at the central position, and hot oil is injected from the highest point. The inclined guide plates 202 are symmetrically arranged on the front and back of the oil inlet pipe 8, and the left and right inclined directions of two adjacent groups of inclined guide plates 202 are opposite. The heat-conducting oil is output from the oil outlet pipe 9 on the upper back side, and under the action of the flow-limiting baffle 203, the heat-conducting oil flow at the position closest to the oil outlet pipe 9 is limited. The distance between the two sides of the interlayer cavity 201 and the oil outlet pipe 9 is moderate, and the heat-conducting oil flow at this location is moderately restricted. The distance between the front position of the interlayer cavity 201 and the oil outlet pipe 9 is the farthest, and the heat-conducting oil flow at this location is not restricted, so that the heat-conducting oil flows evenly forward and backward, left and right in the interlayer cavity 201, ensuring that the heat-conducting oil heats the inside of the hopper 2 evenly to the greatest extent;

[0037] In addition, the oil outlet end of the oil inlet pipe 10 in the pressure seat 7 is set at the central position, and hot oil is injected from the lowest point. The vertical guide plates 704 are arranged equidistantly in the horizontal direction, and the heat transfer oil is output from the oil inlet end of the oil outlet pipe 11 in the top center. Under the action of the flow limiting baffle 702, the heat transfer oil flows evenly from the middle to the two sides, from the middle to the front and back, and from the bottom to the top, thereby ensuring that the heat transfer oil heats the lower surface of the pressure seat 7 evenly to the greatest extent.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil-heating internal mixer for polymer heat-generating PTC, comprising a fixed base (1), a hopper (2) rotatably mounted on the fixed base (1), and a driving mechanism (3) and a fixed frame (4) fixedly mounted on the fixed base (1), wherein the driving mechanism (3) is drivingly connected to two rotors (5) rotatably mounted inside the hopper (2), and a downward push rod (6) located directly above the hopper (2) is fixedly mounted on the fixed frame (4), and a pressure seat (7) that can be movably pressed into the hopper (2) is fixedly mounted on the lower end of the downward push rod (6); Features: The hopper (2) is provided with an interlayer cavity (201), an oil inlet pipe (8) is vertically installed at the center of the bottom of the hopper (2), and the upper end of the oil inlet pipe (8) extends to the central upwardly protruding position inside the interlayer cavity (201), and inclined guide plates (202) are symmetrically fixed on the inner wall of the hopper (2) at the front and back positions of the oil inlet pipe (8) in the interlayer cavity (201), and the two groups of inclined guide plates (202) adjacent to each other in the front and back are inclined in opposite directions, and a flow limiting baffle (203) fixed on the inner wall of the hopper (2) is horizontally provided at a position above the inclined guide plate (202) in the interlayer cavity (201), and an oil outlet pipe (9) is fixed at the middle part above the flow limiting baffle (203) on the back of the hopper (2); The pressure seat (7) is provided with an inner cavity (701), and a second flow limiting baffle (702) is horizontally fixedly connected to the inner cavity (701), and through grooves (703) are provided in the middle of the front and back sides of the second flow limiting baffle (702), and a vertical flow guide plate (704) arranged longitudinally is fixed below the second flow limiting baffle (702). The top of the pressure seat (7) is fixedly provided with an oil inlet pipe (10) and an oil outlet pipe (11) located on the front and back sides of the downward push rod (6), and the oil outlet end of the second oil inlet pipe (10) passes through the second flow limiting baffle (702) and extends to the center of the downwardly protruding position in the middle of the inner cavity (701), and the oil inlet end of the second oil outlet pipe (11) extends to the central position of the top of the inner cavity (701); The ends of the oil inlet pipe 1 (8), the oil inlet pipe 2 (10), the oil outlet pipe 1 (9) and the oil outlet pipe 2 (11) are all installed with adapters (12), and the adapters (12) are connected to the thermal oil circulation heater through a connecting hose.

2. The oil-heating internal mixer for polymer heating PTC according to claim 1, characterized in that: The wall thickness of the hopper (2) and the pressure seat (7) is not less than 1.5 cm.

3. The oil-heating internal mixer for polymer heating PTC according to claim 1, characterized in that: Both ends of the inclined guide plate (202) are fixedly connected to the inner wall of the hopper (2) corresponding to the interlayer cavity (201), and the inclined guide plates (202) are arranged at equal distances in the transverse direction.

4. The oil-heating internal mixer for polymer heating PTC according to claim 1, characterized in that: The top and bottom of the vertical guide plates (704) are respectively fixedly connected to the lower surface of the second flow limiting baffle (702) and the bottom of the inner wall of the pressure seat (7), and the vertical guide plates (704) are arranged at equal distances in the transverse direction.

5. The oil-heating internal mixer for polymer heating PTC according to claim 1, characterized in that: The front and back sides of the vertical guide plate (704) both extend to positions corresponding to the through slots (703), and a gap of half the depth of the protrusion is provided between the bottom of the vertical guide plate (704) and the downwardly protruding position in the middle of the inner cavity (701).

6. The oil-heating internal mixer for polymer heating PTC according to claim 1, characterized in that: The flow limiting baffle plate 1 (203) is arranged on the back side and both sides of the interlayer cavity (201), and the flow limiting baffle plate 1 (203) is fixed on the inner walls of the hopper (2) corresponding to the back side and both sides of the interlayer cavity (201).

7. The oil-heating internal mixer for polymer heat-generating PTC according to claim 6, characterized in that: The distance between the opposite surfaces of the flow limiting baffle plate 1 (203) on both sides of the interlayer cavity (201) and the side wall of the hopper (2) at the corresponding position close to the inner side is twice the distance between the front surface of the flow limiting baffle plate 1 (203) at the back side of the interlayer cavity (201) and the inner wall of the hopper (2) at the corresponding position.

8. The oil-heating internal mixer for polymer heat-generating PTC according to claim 1, characterized in that: A sealing shaft seat (13) for mounting a rotor (5) is installed on both the inner wall and the outer wall of the hopper (2).

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