JP2000246786A - Rubber dough extruder - Google Patents

Abstract

[PROBLEMS] To reduce energy required for heating a rubber material R in an extruder main body 1 and cooling an extruded rubber material R ′. A heat pump is provided between a material heating unit (3) for heating and plasticizing a rubber material (R) in an extruder body (1) and a fabric cooling unit (4) for cooling a rubber fabric (R ') extruded from the extruder body (1). 5 is provided. The heat pump 5 recovers the heat of the high-temperature rubber dough R ′ extruded from the extruder body 1 through the die 2 as cooling latent heat of the refrigerant in the evaporator 52 via the cooling water CW in the dough cooling unit 4. Then, the recovered thermal energy is supplied to the material heating section 3 as latent heat of condensation when the refrigerant is liquefied in the condenser 51, and the rubber material R is heated via the hot water HW.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber dough extruder for continuously extruding a rubber dough for heating and plasticizing a rubber material in the extruder and cooling the rubber dough extruded from the extruder. Related to the technology.

[0002]

2. Description of the Related Art A rubber material used for vulcanization molding of a rubber product is extruded into a continuous shape such as a sheet by a screw type extruder. In this type of extruder, it is necessary to heat and plasticize the rubber material to a predetermined high temperature state so that the rubber material can be easily deformed and extruded easily.
If the extruded rubber fabric is in a high temperature state for a long time, the rubber starts to vulcanize and scorch, and furthermore, the rubber fabrics adhere to each other at the extruded portion and may deteriorate workability in the next process. Therefore, it is necessary to rapidly cool after extrusion.

Conventionally, heating for plasticizing a rubber material inside an extruder is performed by a heater 10 as shown in FIG.
The hot water HW as a heat medium heated in
This is performed by a heating device that circulates and supplies the extruder to a heating portion 103 of the extruder. In this heating device, reference numeral 104 denotes a water supply pipe, 105 denotes a water distribution pipe, and 106 denotes hot water H.
Sight glass for confirming the amount of W; 107, a strainer for removing foreign substances and the like in water; 108, a safety valve for opening and releasing hot water HW when it becomes abnormally high temperature and high pressure; Are various valve devices.

In order to cool the extruded rubber material,
Conventionally, tap water has been used as a cooling medium. However, in order to prevent the cooling capacity from becoming unstable due to a change in tap water temperature in summer and winter, as shown in FIG. (Chiller unit) 201, a cooling water CW of a constant low temperature, and a pump 202 for a dough cooling tank 2.
03, and the high-temperature rubber material extruded from the extruder is passed through the material cooling tank 203. In the process of circulating the refrigerant in the closed circulation circuit, the chiller unit 201 repeatedly changes the phase of the refrigerant (evaporation and condensation).
By utilizing the transfer of latent heat caused by this, heat is absorbed from tap water and cooled. This chiller unit 201
In, the heat absorbed from the tap water as the latent heat of evaporation of the refrigerant is released into the atmosphere as the latent heat of condensation of the refrigerant.

[0005]

However, according to the above prior art, the heating means for plasticizing the rubber material and the cooling means for rapidly cooling the rubber material are independent devices, respectively. By inputting electric energy to the heater 101, the high-temperature rubber material heated and plasticized and extruded is cooled again by the chiller unit 201 using electric energy. For this reason, a problem such as waste of energy has been pointed out, and power consumption has been increased accordingly.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its technical object to save energy in heating a rubber material in an extruder and cooling an extruded rubber material. It is in.

[0007]

As a means for effectively solving the above-mentioned technical problems, a rubber dough extruder according to the present invention comprises a material heating section for plasticizing a rubber material in an extruder main body; A condenser that discharges latent heat associated with condensation of the refrigerant to the material heating unit between the dough cooling unit that cools the rubber dough extruded from the extruder body; and a latent heat associated with vaporization of the refrigerant from the dough cooling unit. A heat pump comprising: an evaporator that absorbs water; a compressor disposed in a refrigerant circulation path from the evaporator to the condenser; and an expansion valve disposed in a refrigerant circulation path from the condenser to the evaporator. Is interposed.

That is, in the above configuration, the heat pump recovers the heat of the rubber cloth passing through the cloth cooling section as latent heat during the evaporation of the refrigerant in the evaporator, and transfers the collected heat energy to the refrigerant in the condenser. Is supplied to the material heating section as latent heat upon liquefaction of the rubber, thereby heating and plasticizing the rubber material in the extruder body.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a rubber dough extruder according to the present invention will be described below with reference to FIGS. FIG. 1 shows the entire rubber dough extruder, and FIG. 2 shows a schematic configuration of a main part in this embodiment.

In these figures, reference numeral 1 denotes a screw type extruder main body, 2 denotes a die attached to the tip of the extruder main body 1, and 3 denotes a rubber material (not shown) in a cylinder of the extruder main body 1. ), A material cooling unit 4 for cooling the rubber material R ′, and a material heating unit 3 for cooling the rubber material R ′.
And a heat pump configured between the dough cooling unit 4 and the dough cooling unit 4.

The extruder main body 1 has a known structure, that is, a cylinder 11 whose tip is connected to a die 2 and whose outer periphery is basically surrounded by a warm water jacket 31 of a material heating section 3. It includes a screw 12 arranged on the inner periphery, a material charging section 13 provided near an end of the cylinder 11 opposite to the die connection section, a driving section 14 for rotating the screw 12, and the like.

The material heating section 3 connects a hot water jacket 31 and a water heating tank 32 installed outside the hot water jacket 31 via pipes 33 and 34, and supplies hot water HW as a heating medium to the pipe 33.
The water is circulated between the warm water jacket 31 and the water heating tank 32 by a water pump 35 arranged in the middle of the above. Screw 12 inside the cylinder 11
The rubber material R sent to the die 2 side while being kneaded by the rotation of is heated to a predetermined temperature required for plasticization by the hot water HW circulated and supplied into the hot water jacket 31.

On the other hand, the dough cooling section 4 is a structure provided independently of the extruder main body 1, and is a dough cooling tank 41 through which the high-temperature rubber dough R 'continuously extruded from the die 2 passes.
And a water cooling tank 42 installed separately from the pipe 43,
44, and low-temperature tap water (hereinafter referred to as cooling water) CW as a cooling medium is supplied to the dough cooling tank 4 by a water pump 45 installed in the middle of the pipe 43.
1 and the water cooling tank 42 are circulated.

The dough cooling tank 41 in the dough cooling unit 4 includes:
The water cooling tank 42 in the cloth cooling unit 4 and the water heating tank 32 in the material heating unit 3 are provided on the base 6 arranged at the position where the rubber cloth R ′ is pushed out from the die 2. It is installed in. Feed rollers 45 and 46 are provided at both ends in the longitudinal direction of the upper edge of the dough cooling tank 41.

That is, the high-temperature rubber material R ′ continuously extruded from the extruder body 1 through the die 2 is sent to the material cooling tank 41 via the feed roller 46, and the cooling in the material cooling tank 41 is performed. It is rapidly cooled in the course of passing through the water CW, and is sent to the next step via the other feed roller 47. The base 6 can be moved by casters 6a.

The heat pump 5 has the following basic parts:
A condenser 51 installed in the water heating tank 32 in the material heating section 3, an evaporator 52 installed in the water cooling tank 42 in the dough cooling section 4, and refrigerant circulation from the evaporator 52 to the condenser 51 The path La, from the condenser 51 to the evaporator 52
And a compressor 53 disposed in the refrigerant circulation path La, an expansion valve 54 disposed in the refrigerant circulation path Lb, and controls the driving of the compressor 53 based on a set temperature. A control device (not shown) and the like are provided, and these are mounted, for example, in the base 6.

That is, the heat pump 5 uses heat released in a conventional chiller unit or the like as energy for heating the rubber cloth R in principle. Heat is transferred from the dough cooling unit 4 to the material heating unit 3 using the transfer of latent heat caused by the phase change (evaporation and condensation) of the refrigerant circulated between the heating unit 3 and the refrigerant. To be transported. Typically, Freon, carbon dioxide, or the like is used as the refrigerant.

In the above configuration, the high-temperature rubber dough R ′ continuously extruded from the extruder main body 1 through the die 2 is supplied with cooling water in the process of passing through the dough cooling tank 41 of the dough cooling unit 4. Heat exchange with CW. For this reason, the rubber material R 'is sent to the next step in a state where it is cooled to a temperature at which scorch or sticking due to vulcanization in a high temperature state does not occur. On the other hand, the cooling water CW heated by receiving heat from the rubber cloth R ′ in the cloth cooling tank 41 is supplied to the water cooling tank 42 by the water pump 45 through the pipe 43.
The heat recovered from the rubber fabric R '
It is carried into the water cooling tank 42 together with the cooling water CW.

The heat carried into the water cooling tank 42 together with the cooling water CW is absorbed as latent heat associated with the evaporation of the refrigerant passing through the evaporator 52 arranged in the water cooling tank 42. In other words, when the compressor 53 of the heat pump 5 is driven to circulate the refrigerant in the refrigerant circulation paths La and Lb, the evaporator 52 adiabatically expands when passing through the expansion valve 54, thereby reducing the internal energy. Refrigerant liquid FL partially consumed as expansion energy and turned into a low-temperature / low-pressure mist
Comes into contact with the inner surface of the serpentine tube having a large heat absorption area constituting the evaporator 52, evaporates vigorously while absorbing the heat of the cooling water CW as latent heat, and is sucked into the compressor 53 as the refrigerant gas FG. You. Then, the cooling water CW in the water cooling tank 42 cooled by the endothermic action in the evaporator 52 is sent again to the cloth cooling tank 41 via the pipe 44 and exchanges heat with the rubber cloth R ′ (rubber cloth). R ′).

The refrigerant gas FG sent from the evaporator 52 to the compressor 53 in the refrigerant circulation path La is supplied with energy by being adiabatically subjected to compression work by the compressor 53, and becomes high temperature and high pressure. , Water heating tank 32 of material heating section 3
Is sent to the condenser 51 disposed at Since the refrigerant gas FG compressed to high temperature and high pressure is easily liquefied by cooling,
In the course of passing through the coil having a large heat dissipation area constituting the condenser 51, the relatively low-temperature hot water HW in the water heating tank 32 is used.
Condenses and liquefies while releasing latent heat actively. Hot water HW, which has been heated to a high temperature by receiving heat from the refrigerant in the water heating tank 32, is sent to the hot water jacket 31 via the pipe 34, and is sent to the die 2 through the cylinder 11 of the extruder main body 1. Provided for heating R.

Hot hot water H passing through the hot water jacket 31
Rubber material R heated and plasticized by heat exchange with W
Is extruded from the cylinder 11 through the die 2 by the rotation of the screw 12 of the extruder main body 1 to form a continuous high-temperature rubber dough R ′, and the dough cooling tank 4 of the dough cooling unit 4
Sent to 1. On the other hand, the refrigerant liquid FL condensed and liquefied by the refrigerant gas FG in the condenser 51 is sent to the evaporator 52 side through the refrigerant circulation path Lb, and the above-described series of heat pump cycles is repeated.

That is, according to the above embodiment, the heat from the high-temperature rubber cloth R ′ extruded from the extruder body 1 through the die 2 is supplied to the heat pump 5 via the cooling water CW in the cloth cooling section 4. , And is transferred to the material heating unit 3 and given to the rubber material R via the warm water HW, thereby forming a heat cycle. Therefore, a heating device such as a heater, which has been required in the related art, is basically unnecessary.

The compressor 53 of the heat pump 5
Is controlled based on the set temperature of the material heating unit 3 or the dough cooling unit 4, the temperature detected by the temperature detecting means, and the like. That is, for example, in order to increase the heating temperature of the rubber material R in the extruder main body 1, the discharge capacity of the compressor 53 is increased, and the energy given to the refrigerant gas FG by the adiabatic compression is increased. The amount of heat supplied to the material heating section 3 increases, and as a result, the amount of heat carried to the cloth cooling section 4 together with the rubber cloth R 'and recovered by the evaporator 52 also increases in proportion. Therefore, the efficiency of energy consumed for heating the rubber material R and cooling the rubber material R 'can be significantly improved.

In the present invention, as described above, a heating means such as a heater is basically unnecessary, but the amount of heat supplied from the material heating unit 3 and the amount of heat supplied from the dough cooling unit 4 are changed due to a change in outside air temperature or the like. If the heat balance with the recovered heat is lost, an auxiliary heat source may be used. As an auxiliary heat source in this case, an electric heater may be installed in the water heating tank 32 in the material heating unit 3 or the like.

[0025]

According to the rubber dough extruder according to the present invention,
The heat of the high-temperature rubber dough extruded from the extruder body through the die is recovered in the dough cooling unit, transferred to the material heating unit as latent heat of the refrigerant by a heat pump, and used to heat the rubber material in the extruder body. In order to use, a heating device such as a heater required in the prior art is basically unnecessary, and therefore, energy for heating and plasticizing the rubber material is used for cooling the extruded rubber cloth. The energy consumption can be significantly reduced as compared with the case of using separately from energy.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a rubber dough extruder according to one embodiment of the present invention.

FIG. 2 is a schematic structural explanatory view showing a main part of the embodiment.

FIG. 3 is a schematic configuration explanatory view showing a material heating unit and a dough cooling unit in a conventional rubber dough extruder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extruder main body 11 Cylinder 12 Screw 13 Material input part 14 Drive part 2 Die 3 Material heating part 31 Hot water jacket 32 Water heating tank 33,34,43,44 Piping 35,45 Water pump 4 Dough cooling part 41 Dough cooling tank 42 Water cooling tanks 46, 47 Feed roller 5 Heat pump 51 Condenser 52 Evaporator 53 Compressor 54 Expansion valve 6 Base 6a Caster CW Cooling water FG Refrigerant gas FL Refrigerant liquid HW Hot water La, Lb Refrigerant circulation route R Rubber material R 'Rubber Cloth

Claims (1)

[Claims] 1. A material heating section (3) for plasticizing a rubber material (R) in an extruder main body (1) and a rubber material (R ′) extruded from the extruder main body (1) are cooled. A condenser (51) for releasing latent heat by condensation of the refrigerant to the material heating unit (3) between the dough cooling unit (4), and a latent heat by vaporization of the refrigerant from the dough cooling unit (4); An evaporator (52); a compressor (53) disposed in a refrigerant circulation path (La) from the evaporator (52) to the condenser (51); and a compressor (53) from the condenser (51). 52. A rubber dough extruder characterized by interposing a heat pump (5) comprising an expansion valve (54) arranged in a refrigerant circulation path (Lb) leading to a refrigerant circulation path (52).