Cooling screw sleeve and screw blanking device

Abstract

The utility model discloses a cooling screw sleeve and a screw blanking device, the cooling screw sleeve comprises a columnar inner cylinder and an outer cylinder, the inner cylinder is coaxially sleeved with the outer cylinder, an annular sealing runner is formed between the outer cylinder and the inner cylinder, and an inlet pipe and an outlet pipe are arranged at the top of the outer cylinder; and a cooling medium flows into the annular sealing flow channel through the inlet pipe and flows out of the outlet pipe, so that a circulating cooling system is formed. According to the cooling screw sleeve, the circulating cooling system arranged on the cylinder wall is adopted for cooling, the service life is long, universality is achieved, the structure of an existing circulating cooling flow channel is optimized, an annular sealing flow channel is directly formed in the circumferential face of the cylinder wall through matching of the outer cylinder and the inner cylinder, the structure is simplified, the manufacturing difficulty is lowered, and the service life of the cooling screw sleeve is prolonged. And meanwhile, only one layer of inner cylinder wall is arranged between a cooling medium in the annular sealing flow channel and a material in the cooling screw sleeve, so that the contact area is greatly increased, the amount of the contained cooling medium is also remarkably increased, and a better cooling effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of the metering and conveying of temperature sensitive materials, and particularly relates to a cooling screw sleeve and a screw discharging device. BACKGROUND

[0002] In the material conveying and metering process of the chemical, plastic, food and other industries, screw discharging devices are widely used in the transmission of powder, granules and viscous materials. However, with the continuous introduction of new materials and the complication of processing technology, especially in the chemical industry, many special materials are abnormally sensitive to temperature during processing, such as phenyl ether, polyethylene (PE), polypropylene (PP), polystyrene (PS) and the like. Such materials are prone to soften or melt due to frictional heating during processing, resulting in material adhesion to the surface or inner wall of the screw. The conventional screw discharging device is difficult to maintain an appropriate temperature during high-efficiency operation due to the lack of effective cooling mechanism in its structure. Especially in the case of continuous operation, the friction between the screw and the inner wall of the screw sleeve will gradually accumulate heat, causing the temperature to rise. This heat will directly act on the material, which may cause the material to soften, melt or adhere, and cannot achieve metering and conveying. On the other hand, adhesion at high temperature may also cause blockage, thereby causing the equipment to stop and the servo motor to alarm, seriously affecting the continuous operation of the production line and the production efficiency. At present, in order to solve the problem of frictional heating of the screw discharging device, some equipment attempts to increase a lubricating coating on the surface of the screw or select a high-temperature resistant material to delay heat accumulation. However, these methods can only partially alleviate the temperature rise caused by friction, and the effect is not good. In addition, the coating is prone to wear in long-term use, and the application of high-temperature resistant materials has a high cost, further limiting the universal applicability of these methods.

[0003] Chinese invention application with the authorized announcement number CN 105563794 B discloses a screw cylinder cooling device, which comprises a screw cylinder and a plurality of first cooling flow channels and second cooling flow channels arranged in the wall of the screw cylinder and penetrating through both ends of the screw cylinder and parallel to the axis of the screw cylinder. The first cooling flow channels and the second cooling flow channels are connected in series to form cooling circulation flow channels, and there are four groups of cooling circulation flow channels arranged in a circular array on the screw cylinder. The cooling medium in the cooling circulation flow channels exchanges heat with the screw cylinder, thereby cooling the material in the screw cylinder. This structure is relatively effective compared with the two aforementioned structures, but the overall structure is relatively complex, and the cooling circulation flow channels are not only separated from the material in the screw cylinder by the screw cylinder wall, but also separated by the pipeline. At the same time, the amount of cooling medium that can be introduced is relatively small, which also affects the cooling effect to some extent. SUMMARY

[0004] The utility model discloses a cooling screw sleeve and a screw discharging device aiming at the deficiencies of the prior art to meet the conveying needs of temperature-sensitive materials, efficiently cool the conveyed materials, ensure the running stability and the accuracy of metering of the discharging device, and are simple in structure and low in manufacturing cost.

[0005] The technical scheme for achieving the utility model is as follows:

[0006] A cooling screw sleeve comprises a cylindrical inner cylinder and an outer cylinder coaxially sleeved outside the inner cylinder and forming an annular sealed flow channel with the inner cylinder, the top of the outer cylinder is provided with an inlet pipe and an outlet pipe, cooling medium flows into the annular sealed flow channel through the inlet pipe and flows out from the outlet pipe, forming a circulating cooling system.

[0007] Further, the inlet pipe and the outlet pipe are symmetrically arranged in the circumferential direction.

[0008] Further, the bottom of the inlet pipe extends downward to the bottom of the annular sealed flow channel, forming a circulating flow channel with low inlet and high outlet.

[0009] Further, the upper part of the inner cylinder is large and the lower part is small, forming a flared bell mouth.

[0010] Further, the top of the inner cylinder is provided with an annular flange plate coaxially arranged and integrally formed.

[0011] A screw discharging device comprises the cooling screw sleeve as described above, the cooling screw sleeve is coaxially provided with a screw inside, and the bottom is provided with an openable and closable material blocking cover.

[0012] Further, the material blocking cover is composed of an outer spherical material blocking door and an inner spherical material blocking door which are arranged in a split manner and are hingedly connected to the inner cylinder, the upper part of the outer periphery of the upper part of the inner cylinder is fixedly connected with a mounting seat, the upper part and the lower part of the mounting seat are respectively hingedly connected with a pneumatic cylinder and a swing rod, the upper end of the swing rod is hingedly connected with the piston rod of the pneumatic cylinder, the lower end is provided with two free ends, and the free ends are respectively hingedly connected with a pull rod between the outer spherical material blocking door and the inner spherical material blocking door.

[0013] By adopting the above technical scheme, the utility model has the following beneficial effects:

[0014] (1) The cooling screw sleeve of the utility model is cooled by the circulating cooling system arranged on the cylinder wall, has long service life and universality, and optimizes the structure of the existing circulating cooling flow channel, forms the annular sealed flow channel on the peripheral surface of the cylinder wall through the cooperation of the outer cylinder and the inner cylinder, simplifies the structure, reduces the manufacturing difficulty, saves the manufacturing cost, the cooling medium in the annular sealed flow channel and the materials in the cooling screw sleeve are only separated by one layer of inner cylinder wall, the contact area is also greatly increased, the amount of cooling medium that can be accommodated is also significantly improved, and better cooling effect is achieved.

[0015] (2) The inlet pipe and the outlet pipe of the cooling screw sleeve are symmetrically arranged, the maximum interval in the horizontal direction is achieved, and interference of medium in and out is avoided.

[0016] (3) The inlet pipe, the annular sealing flow channel and the outlet pipe of the cooling screw sleeve form a circulating flow channel with low inlet and high outlet, the fluid can be more uniformly distributed in the whole flow channel, local overheating or overcooling is avoided, meanwhile, since the material enters the cooling screw sleeve from top to bottom, and then reaches the lower part after repeated friction, the heat is the largest, the cold fluid medium entering from the bottom can ensure that it first contacts the hottest part, so that the heat can be more effectively absorbed, and the heat exchange efficiency is improved.

[0017] (4) The upper part of the inner cylinder of the cooling screw sleeve is designed as a horn, which is more conducive to the material entering the cooling screw sleeve.

[0018] (5) The cooling screw sleeve is provided with an integrally formed annular mounting plate, which is convenient for mounting on the corresponding filling equipment.

[0019] (6) The screw discharging device adopts the cooling screw sleeve, when the screw discharging is carried out, the temperature-sensitive material in the inside can be cooled in time, the material is prevented from being heated and adhered, and the running stability and the measurement accuracy of the discharging device are ensured.

[0020] (7) The screw discharging device drives the upper end of the swing rod through the air cylinder, so that the swing rod rotates clockwise around the hinge point of the mounting seat, so that the lower end moves up, and then the two spherical material closing doors are opened and closed through the pull rod, the structure is simple, and the action is quick. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to make the content of the utility model more easily and clearly understood, the utility model will be further described in detail below according to specific embodiments and in combination with the drawings, in which:

[0022] Fig. 1 It is a perspective view of the utility model;

[0023] Fig. 2 It is an internal structure schematic view of the utility model.

[0024] The reference numerals in the drawings are:

[0025] Screw rod 1, material blocking cover 2, outer spherical material closing door 2-1, inner spherical material closing door 2-2, inner cylinder 3, annular flange plate 3-1, outer cylinder 4, annular sealing flow channel 5, inlet pipe 6, outlet pipe 7, mounting seat 8, air cylinder 9, swing rod 10, pull rod 11. DETAILED DESCRIPTION

[0026] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0027] (Example 1)

[0028] like Figs. 1-2 The screw feeding device shown includes a cooling screw sleeve, a screw 1, and a baffle 2. The cooling screw sleeve includes an inner cylinder 3 and an outer cylinder 4. The inner cylinder 1 has a cylindrical structure, and the screw 1 is coaxially arranged in the inner cylinder 1. The rotation of the screw 1 realizes the metering and conveying of materials. The baffle 2 is openable and closable at the lower end of the cooling screw sleeve, blocking the material inlet at the lower end. This prevents the material from spilling into the packaging environment due to its good fluidity during the brief interval when the screw 1 stops rotating, thus preventing pollution of the production environment and stopping material leakage.

[0029] The screw 1 rotates at high speed within the inner cylinder 3, and fine materials become trapped between it and the inner wall of the inner cylinder 3. Friction with the inner wall and the materials continuously generates heat, which accumulates, posing a risk of melting to the materials due to the high temperature. In this embodiment, the outer cylinder 4 is coaxially and loosely fitted around the inner cylinder 1, with its upper and lower ends sealing against the inner cylinder 1, thus forming an annular sealed flow channel 5. The top of the outer cylinder 4 is provided with an inlet pipe 6 and an outlet pipe 7 connecting the annular sealed flow channel 5. The cooling medium flows into the annular sealed flow channel 5 through the inlet pipe 6 and exits through the outlet pipe 7, forming a circulating cooling system. During this process, the cooling medium is in full contact with the cylinder wall, and the heat accumulated on the cylinder wall is continuously carried away. This prevents the heat generated by the high-speed friction between the screw 1 and the inner wall of the inner cylinder 3 from accumulating excessively and the temperature from rising further. Consequently, the material can be smoothly driven into the packaging container below by the rotation of the screw 1 at a suitable temperature, achieving the purpose of the filling equipment in the packaging unit and the material feeding effect. At the same time, it also ensures the dosage accuracy of the material and the stability of product performance. Compared with existing cooling screw sleeves, this design not only simplifies the structure, reduces manufacturing difficulty, and saves manufacturing costs, but also increases the contact area between the cooling medium in the annular sealed flow channel and the material in the cooling screw sleeve, which is separated by only one layer of the inner cylinder wall. This significantly increases the amount of cooling medium that can be accommodated, resulting in a better cooling effect.

[0030] Specifically, the material blocking cover 2 is composed of an outer spherical material blocking door 2-1 and an inner spherical material blocking door 2-2 which are arranged in pairs and are hinged to the inner cylinder 3, the upper outer circumferential surface of the inner cylinder 3 is fixed with a mounting seat 8, the upper part and the lower part of the mounting seat 8 are respectively hinged with a pneumatic cylinder 9 and a swing lever 10, the upper end of the swing lever 10 is hinged with the piston rod of the pneumatic cylinder 9, the lower end is provided with two free ends, and the free ends are respectively hinged with the pull rod 11 between the outer spherical material blocking door 2-1 and the inner spherical material blocking door 2-2. By pushing the upper end of the swing lever 10 through the pneumatic cylinder 9, the swing lever 10 is rotated clockwise around the hinge point with the mounting seat 8, so that the lower end is moved upward, and then the two spherical material blocking doors are opened and closed through the pull rod 11, which is simple in structure and quick in action.

[0031] The cooling medium is preferably water, which can achieve cooling effect and is safe and environmentally friendly. The inlet pipe 6 and the outlet pipe 7 are arranged symmetrically in the circumferential direction to achieve the maximum spacing in the horizontal direction, avoiding interference of the circulating water in and out. The bottom of the inlet pipe 6 extends downward to the bottom near the annular sealing flow channel 5, forming a low-in and high-out circulating flow channel with the outlet pipe 7, which can make the circulating water more evenly distributed in the entire flow channel, avoiding local overheating or overcooling phenomenon. At the same time, since the material enters the cooling screw sleeve from top to bottom, and then reaches the lower part after repeated friction, the heat is the largest at this time, and the circulating water enters from the bottom, which can ensure that it first contacts the hottest part, so that it can more effectively absorb heat and improve heat exchange efficiency.

[0032] In order to facilitate feeding, the top of the inner cylinder 3 of the embodiment is provided with a coaxially arranged annular flange plate 3-1 which is integrally formed, facilitating installation on the corresponding filling equipment. The upper part of the inner cylinder 3 is large at the top and small at the bottom, forming an outwardly expanding bell mouth, which is more conducive to the material entering the inner cylinder 3.

[0033] The embodiment discards the traditional coating cooling method, and directly acts on temperature control through water cooling, avoiding the performance degradation problem caused by screw sleeve coating wear, reducing the equipment maintenance demand and cost caused by coating failure. This cooling method is particularly reliable under high-strength and long-time operation conditions, which helps to prolong the service life of the equipment, significantly reduces the operation cost, ensures the stable state of the material in the conveying process, avoids the inaccurate dosage problem caused by temperature rise of the conventional device, greatly improves the reliability of the metering, thereby ensuring the consistency of the product quality and the stability of the process.

[0034] In addition, by cooperation of the outer cylinder and the inner cylinder, the annular sealing flow channel is directly formed on the circumferential surface of the cylinder wall, which not only simplifies the structure, reduces the manufacturing difficulty and saves the manufacturing cost, but also increases the contact area between the cooling medium in the annular sealing flow channel and the material in the cooling screw sleeve, significantly improves the amount of the cooling medium that can be accommodated, realizes better cooling effect, rapidly and stably removes the heat generated by friction between the screw and the screw sleeve, avoids the material softening, adhesion and blocking phenomenon caused by temperature rise in the traditional device, and ensures the smoothness of the material conveying and the continuous operation of the equipment.

[0035] The above specific embodiments further specifically describe the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above description is only for specific embodiments of the utility model and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A cooling screw sleeve, characterized by: The cooling screw sleeve comprises a cylindrical inner cylinder (3) and an outer cylinder (4) coaxially sleeved outside the inner cylinder (3) and forming an annular sealing flow channel (5) between the inner cylinder (3) and the outer cylinder (4), the top of the outer cylinder (4) is provided with an inlet pipe (6) and an outlet pipe (7), cooling medium flows into the annular sealing flow channel (5) through the inlet pipe (6) and flows out from the outlet pipe (7), forming a circulating cooling system.

2. A cooled screw sleeve according to claim 1, characterized in that: The inlet pipe (6) and the outlet pipe (7) are symmetrically arranged in the circumferential direction.

3. A cooling screw sleeve according to claim 1, characterized in that: The bottom of the inlet pipe (6) extends downward to the bottom of the annular sealing flow channel (5) to form a low-in and high-out circulating flow channel with the outlet pipe (7).

4. A cooled screw sleeve according to claim 1, characterized in that: The upper part of the inner cylinder (3) is large downward and small upward, forming an outwardly expanding bell mouth.

5. A cooled screw sleeve according to claim 4, characterised in that: The top of the inner cylinder (3) is provided with a coaxially arranged and integrally formed annular flange plate (3-1).

6. A screw de-chucking device characterized by: The cooling screw sleeve comprises a cooling screw sleeve as claimed in any one of claims 1 to 5, a screw (1) coaxially arranged in the cooling screw sleeve, and a closable material blocking cover (2) arranged at the bottom.

7. A screw de-chucking device according to claim 6, wherein: The material blocking cover (2) is composed of an outer spherical material blocking door (2-1) and an inner spherical material blocking door (2-2) which are arranged in pairs and are hingedly connected to the inner cylinder (3), an installation seat (8) is fixed to the outer periphery of the upper part of the inner cylinder (3), a pneumatic cylinder (9) and a swing rod (10) are hingedly connected to the upper part and the lower part of the installation seat (8) respectively, the upper end of the swing rod (10) is hingedly connected to the piston rod of the pneumatic cylinder (9), and the lower end of the swing rod (10) is provided with two free ends which are hingedly connected to the outer spherical material blocking door (2-1) and the inner spherical material blocking door (2-2) respectively.

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