A waste heat recovery system for a coating sand mill

Abstract

The utility model discloses a waste heat recovery system for a paint sand mill, including a machine base, a cylinder body is arranged on the machine base, a rotatable stirring shaft is installed in the cylinder body, and two rotatable transmission gears are also arranged in the machine base, one of which is fixed coaxially with the stirring shaft, and the other is fixed coaxially with an external driving motor, and the two transmission gears are connected by a transmission belt. The utility model relates to the technical field of sand mills. The waste heat recovery system for a paint sand mill greatly improves the waste heat utilization rate of the sand mill by arranging two independent waste heat recovery systems, one of which is a liquid heat exchange system, which absorbs waste heat by pouring a large amount of cold water into the cylinder body, and generates hot steam after absorbing heat, and finally the waste heat is discharged in the form of hot steam, which can be used for boiler heating, etc.

Description

Technical Field

[0001] The utility model relates to the technical field of coating processing, in particular to a waste heat recovery system for a coating sand mill. Background Art

[0002] Sand mills are mainly used for fine grinding of coatings to achieve the required particle size. Under the action of high-speed collision and friction, a large amount of heat will be generated inside the cylinder of the sand mill. This heat needs to be evacuated in time, otherwise it will affect the normal operation of the sand mill.

[0003] For example, Chinese authorized patent CN214554071 U discloses a horizontal sand mill with waste heat recovery function, which uses heat-absorbing sand to absorb and store heat by setting up a waste heat recovery system to provide a preheating function for the next operation of the cylinder.

[0004] However, the above heat recovery is limited, that is, the waste heat generated during the operation of the cylinder far exceeds the preheating heat required for the operation of the cylinder, so most of the waste heat is still wasted. For this reason, our company provides a recovery system with higher waste heat utilization rate to improve the utilization rate of waste heat. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the utility model provides a waste heat recovery system for a coating sand mill, which solves the problem of low waste heat utilization rate of the prior sand mill.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a paint sand mill waste heat recovery system, including a machine base, a cylinder is arranged on the machine base, a rotatable stirring shaft is installed in the cylinder, and two rotatable transmission gears are also arranged in the machine base, one group of transmission gears is coaxially fixed with the stirring shaft, and the other group of transmission gears is coaxially fixed with an external drive motor, and the two groups of transmission gears are connected by a transmission belt.

[0009] The cylinder body is respectively provided with a feed inlet and a discharge outlet.

[0010] The inner wall of the cylinder is provided with an interlayer, and a cold water inlet and a steam outlet communicated with the outside are respectively provided on the interlayer, and the steam outlet is externally connected to an exhaust pipe.

[0011] An auxiliary heat recovery system is also provided on the cylinder.

[0012] As a further preference, the auxiliary heat recovery system includes a hot air blower, a cold air blower and a heat exchanger, the inlet of the hot air blower is connected to the hot air outlet of the cylinder, the outlet of the hot air blower is connected to the heat exchanger through a hot air pipe, the inlet of the cold air blower is connected to the heat exchanger through a cold air pipe, and the outlet of the cold air blower is connected to a stirring chamber in the cylinder.

[0013] As a further preference, a filter is provided on the inner wall of the cylinder, and the filter is located at the hot air outlet in the cylinder.

[0014] As a further preference, a side wall in the interlayer away from the stirring shaft is provided with a thermal insulation coating.

[0015] (III) Beneficial effects

[0016] The utility model provides a waste heat recovery system for a paint sand mill, which has the following beneficial effects:

[0017] The waste heat recovery system of the paint sand mill greatly improves the waste heat utilization rate of the sand mill by setting up two independent waste heat recovery systems. One of the waste heat recovery systems is a liquid heat exchange system. By pouring a large amount of cold water into the cylinder, the cold water can absorb the waste heat. After absorbing the heat, the cold water generates hot steam, and finally the waste heat is discharged in the form of hot steam. The hot steam can be used for boiler heating, etc. The other waste heat recovery system is a gas heat exchange system. The heat inside the cylinder is discharged by a fan, and the heat exchange is completed through a heat exchanger. The hot gas after the heat exchange can be used for other purposes, thereby significantly improving the waste heat utilization rate and saving resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model.

[0019] In the figure: 1. machine base; 2. cylinder; 3. stirring shaft; 4. transmission gear; 5. driving motor; 6. transmission belt; 7. feed inlet; 8. discharge outlet; 9. interlayer; 10. cold water inlet; 11. steam outlet; 12. hot air blower; 13. cold air blower; 14. heat exchanger; 15. hot air duct; 16. cold air duct; 17. filter; 18. thermal insulation coating. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] like Figure 1As shown, the utility model provides a technical solution: a waste heat recovery system for a paint sand grinder, comprising a machine base 1, a cylinder 2 is arranged on the machine base 1, a rotatable stirring shaft 3 is installed in the cylinder 2, and a plurality of groups of ceramic blades are arranged on the stirring shaft 3 to increase the collision area and improve the grinding effect. Two rotatable groups of transmission gears 4 are also arranged in the machine base 1, one group of transmission gears 4 is coaxially fixed with the stirring shaft 3, and the other group of transmission gears 4 is coaxially fixed with an external driving motor 5, and the two groups of transmission gears 4 are connected by a transmission belt 6.

[0022] The cylinder 2 is provided with a feed inlet 7 and a discharge port 8 respectively, and mechanical seals are provided at the places where the feed inlet 7 and the discharge port 8 contact the interlayer 9.

[0023] The inner wall of the cylinder 2 is provided with an interlayer 9, and a side wall of the interlayer 9 away from the stirring shaft 3 is provided with a thermal insulation coating 18. The purpose of providing the thermal insulation coating 18 is to prevent heat loss. The interlayer 9 is respectively provided with a cold water inlet 10 and a steam outlet 11 connected to the outside, and the steam outlet 11 is externally connected to an exhaust pipe.

[0024] An auxiliary heat recovery system is also provided on the cylinder 2, and the auxiliary heat recovery system includes a hot air blower 12, a cold air blower 13 and a heat exchanger 14. The inlet of the hot air blower 12 is connected to the hot air outlet of the cylinder 2, and the outlet of the hot air blower 12 is connected to the heat exchanger 14 through a hot air pipe 15. The inlet of the cold air blower 13 is connected to the heat exchanger 14 through a cold air pipe 16. The heat exchanger 14 realizes heat exchange with the hot air through liquid inside, absorbs heat in the hot air through the cold liquid, and then discharges the hot fluid carrying the heat. The outlet of the cold air blower 13 is connected to the stirring chamber in the cylinder 2.

[0025] The inner wall of the cylinder 2 is provided with a filter screen 17 , which is located at the hot air outlet in the cylinder 2 , and is provided to prevent raw materials from accidentally entering the hot air blower 12 .

[0026] Meanwhile, the contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field.

[0027] When in use, the raw materials enter the mixing chamber inside the barrel 2 through the feed port 7, cold water enters the interlayer 9 through the cold water inlet 10, and the drive motor 5 is turned on to drive the transmission gear 4 and the transmission belt 6 to rotate, thereby driving the mixing shaft 3 to rotate at high speed to grind the raw materials.

[0028] The heat generated during the grinding process is quickly absorbed by the cold water in the interlayer 9. The cold water absorbs the heat and boils, and is discharged through the steam outlet 11 in the form of hot steam, and is used for other purposes through the external exhaust pipe.

[0029] Furthermore, the hot air blower 12 is turned on to directly extract the hot air in the mixing chamber, and the hot air enters the heat exchanger 14 through the hot air pipe 15. After heat exchange, the heat is used for other purposes, and the cold air after heat exchange re-enters the mixing chamber through the cold air blower 13, thereby achieving the purpose of dynamic balance (the direction of the arrow in the figure indicates the direction of hot air flow).

[0030] The polished material can be discharged through the discharge port 8.

[0031] In summary, the waste heat recovery system of the paint sand mill greatly improves the waste heat utilization rate of the sand mill by setting up two independent waste heat recovery systems. One of the waste heat recovery systems is a liquid heat exchange system. By pouring a large amount of cold water into the cylinder, the cold water can absorb the waste heat. After absorbing the heat, the cold water generates hot steam, and finally the waste heat is discharged in the form of hot steam. The hot steam can be used for boiler heating, etc. The other waste heat recovery system is a gas heat exchange system. The heat inside the cylinder is discharged through a fan, and the heat exchange is completed through a heat exchanger. The hot gas after the heat exchange can be used for other purposes, thereby significantly improving the waste heat utilization rate and saving resources.

[0032] It should be noted that the electrical components appearing in this article are all connected to the external main controller and 220V or 380V mains electricity, and the main controller can be a conventional known device for controlling computers, etc. Its control principle, internal structure and control switch mode are all conventional means of the prior art, which are directly quoted here without further elaboration. In this article, relational terms such as first and second 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 variant 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.

[0033] 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. A waste heat recovery system for a coating sand mill, characterized in that: The machine base (1) comprises a cylinder (2) disposed on the machine base (1), a rotatable stirring shaft (3) being installed in the cylinder (2), and two rotatable transmission gears (4) being also disposed in the machine base (1), wherein one transmission gear (4) is coaxially fixed to the stirring shaft (3), and the other transmission gear (4) is coaxially fixed to an external driving motor (5), and the two transmission gears (4) are connected to each other by a transmission belt (6); The cylinder (2) is provided with a feed inlet (7) and a discharge outlet (8) respectively; The inner wall of the cylinder (2) is provided with an interlayer (9), and the interlayer (9) is provided with a cold water inlet (10) and a steam outlet (11) which are connected to the outside, and the steam outlet (11) is externally connected to an exhaust pipe; An auxiliary heat recovery system is also provided on the cylinder (2).

2. A paint sand mill waste heat recovery system according to claim 1, characterized in that: The auxiliary heat recovery system comprises a hot air blower (12), a cold air blower (13) and a heat exchanger (14); the inlet of the hot air blower (12) is connected to the hot air outlet of the cylinder (2); the outlet of the hot air blower (12) is connected to the heat exchanger (14) via a hot air pipe (15); the inlet of the cold air blower (13) is connected to the heat exchanger (14) via a cold air pipe (16); and the outlet of the cold air blower (13) is connected to the stirring chamber in the cylinder (2).

3. A paint sand mill waste heat recovery system according to claim 2, characterized in that: The inner wall of the cylinder (2) is provided with a filter screen (17), and the filter screen (17) is located at the hot air outlet in the cylinder (2).

4. A paint sand mill waste heat recovery system according to claim 1, characterized in that: A thermal insulation coating (18) is provided on one side wall of the interlayer (9) away from the stirring shaft (3).

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