High-pressure hot air device for removing residual wax

Abstract

The utility model discloses a high-pressure hot air device for removing residual wax, and relates to the technical field of wax blowing production auxiliary devices. The high-pressure hot air device for removing the residual wax comprises a compressed air supply system used for providing compressed air; the input end of the gas-liquid heat exchanger is connected with a connecting pipeline of the compressed air supply system, and the gas-liquid heat exchanger is arranged in the electric heating wax tank; the gas inlet end of the heat insulation gas conveying pipe is connected to the output end of the gas-liquid heat exchanger; the heat insulation air gun is connected to the air outlet end of the heat insulation air conveying pipe; the first control valve is arranged on a connecting pipeline of the compressed air supply system and is used for controlling the connection and disconnection of the connecting pipeline; and the second control valve is arranged on the heat insulation gas conveying pipe and is used for controlling the on-off of a gas path of the heat insulation gas conveying pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of auxiliary devices for wax blowing production, in particular to a high-pressure hot air device for removing residual wax. Background Art

[0002] The intermediate and main valve bodies of the air control valves in railway freight cars and passenger cars have wax boiling process requirements. This product is a cast iron part that has been mechanically processed, air tightness tested and QPQ treated before being wax boiled.

[0003] Technical requirements for wax-boiling workpieces: The wax film thickness must be uniform, and there must be no wax accumulation, white wax film, or impurities.

[0004] The original process for cleaning the residual wax is: after boiling the wax, while the workpiece is preheated and the residual wax is in liquid state, use compressed air at room temperature to blow away the residual wax on the inner and outer surfaces of the workpiece.

[0005] In the actual production process, for this type of chamber workpiece, the residual wax on the outer surface is easy to clean after wax boiling, but the residual wax inside the chamber is not easy to clean thoroughly. There are always sporadic residual wax on the bottom of the workpiece cavity and the bottom of the corners that cannot be blown clean. For products that require wax boiling technology, the complex structure of the workpiece cavity has a great impact on wax blowing.

[0006] Reasons for not cleaning the residual wax in the inner cavity: At the end of blowing the residual wax with normal temperature compressed air, as the wax-boiling workpiece gradually cools down, the part blown by the normal temperature compressed air cools down faster. The residual wax there is forced to form a semi-solidified wax film, which adheres to the inner surface of the chamber, and the normal temperature compressed air can no longer blow it out of the chamber. It seems that the residual wax in the chamber has been blown clean. When the normal temperature compressed air is evacuated, the semi-solidified wax film on the inner surface of the workpiece is melted by the preheating of the workpiece. The melted residual wax will gather from the surroundings at the bottom of the inner cavity of the workpiece and the bottom of the corners. As the temperature of the workpiece continues to drop, these residual wax are not easy to be blown out.

[0007] The existing wax blowing method has difficulty in meeting the wax boiling technical requirements, and wax blowing must be performed multiple times during the wax boiling process. Products that fail to meet the wax blowing requirements must be re-boiled, which is not only labor-intensive and time-consuming, but also affects the product's production schedule. Utility Model Content

[0008] To this end, the embodiment of the utility model provides a high-pressure hot air device for removing residual wax to solve the problems existing in the above-mentioned technology.

[0009] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0010] A high-pressure hot air device for removing residual wax, comprising:

[0011] Compressed air supply system, used to provide compressed air;

[0012] A gas-liquid heat exchanger, the input end of which is connected to a connecting pipeline of a compressed air supply system, and the gas-liquid heat exchanger is arranged in an electrically heated wax tank;

[0013] An insulated gas pipeline, the gas inlet end of which is connected to the output end of the gas-liquid heat exchanger; an insulated air gun, which is connected to the gas outlet end of the insulated gas pipeline;

[0014] A first control valve, which is arranged on a connecting pipeline of the compressed air supply system and is used to control the on-off of the connecting pipeline;

[0015] The second control valve is arranged on the insulated gas pipeline and is used to control the on-off of the gas circuit of the insulated gas pipeline.

[0016] Optionally, a solenoid valve is provided on the connecting pipeline of the compressed air supply system, and the solenoid valve is provided between the first control valve and the gas-liquid exchanger. A sensor is provided in the gas-liquid exchanger for detecting whether the gas-liquid exchanger is leaking. The solenoid valve is electrically connected to the sensor in the gas-liquid exchanger.

[0017] Optionally, both the first control valve and the second control valve are plug valves.

[0018] Optionally, the solenoid valve is an electrically controlled three-way valve, and the sensor is a differential pressure sensor.

[0019] Optionally, a splash-proof damping cover is provided above the gas-liquid exchanger, and the splash-proof damping cover is fixed in the electric heating wax tank.

[0020] The utility model has at least the following beneficial effects:

[0021] The utility model arranges a gas-liquid heat exchanger in an electric heating wax tank and connects it to a compressed air supply system. When the electric heating wax tank is preheated, the heat generated by the preheating is used to heat the compressed air in the gas-liquid heat exchanger, and the compressed air is discharged through an insulated air supply pipe and an insulated air gun connected to the gas-liquid heat exchanger. The hot air is used to blow the residual wax inside the workpiece chamber, so that the residual wax is melted and can be blown out more easily, thereby improving the qualified rate of the blown wax products, reducing the number of rework times, saving manpower and material resources, and avoiding affecting the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly explain the prior art and the present invention, the following briefly introduces the drawings required for describing the prior art and the present invention. Obviously, the drawings described below are only exemplary, and for ordinary technicians in this field, other drawings can be derived from the provided drawings without creative work.

[0023] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0024] Figure 1 The utility model is a schematic diagram of the overall structure of an embodiment.

[0025] Description of reference numerals:

[0026] 1. Compressed air supply system; 2. Solenoid valve; 3. Electric heating wax tank; 4. Gas-liquid heat exchanger; 5. Splash damping cover; 6. Insulated air pipe; 7. Insulated air gun. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] In the description of the present invention, unless otherwise specified, "plurality" means two or more. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are intended to distinguish the objects referred to. For schemes with a sequential flow, this terminology does not have to be understood as describing a specific order or sequence. For schemes with device structures, this terminology does not distinguish between importance, positional relationships, etc.

[0029] In addition, the terms "comprises", "has" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that have been explicitly listed, but may also include other steps or units that are not explicitly listed but are inherent to these processes, methods, products or apparatuses, or steps or units that are added based on further optimization schemes conceived by the present invention.

[0030] like Figure 1 As shown, a high-pressure hot air device for removing residual wax disclosed in the utility model comprises:

[0031] A compressed air supply system 1, for providing compressed air;

[0032] A gas-liquid heat exchanger 4, the input end of which is connected to a connecting pipeline of a compressed air supply system 1, and the gas-liquid heat exchanger 4 is arranged in the electric heating wax tank 3;

[0033] an insulated gas pipeline 6, wherein the gas inlet end of the insulated gas pipeline 6 is connected to the output end of the gas-liquid heat exchanger 4;

[0034] A heat-insulating air gun 7, wherein the heat-insulating air gun 7 is connected to the air outlet end of the heat-insulating air pipe 6;

[0035] A first control valve, which is arranged on the connecting pipeline of the compressed air supply system 1 and is used to control the opening and closing of the connecting pipeline;

[0036] The second control valve is arranged on the insulated gas pipeline 6 and is used to control the on-off of the gas path of the insulated gas pipeline 6.

[0037] The compressed air supply system 1 can use a commercially available compressed air machine to increase the compressed air; the gas-liquid heat exchanger 4 can use a commercially available suitable heat exchanger, and the gas-liquid heat exchanger 4 is installed in the middle of the heating zone in the automatic constant temperature electric heating wax boiling tank, and the high temperature liquid wax is used to heat the gas-liquid heat exchanger 4;

[0038] In order to improve the safety performance of the heat exchanger, the safety factor of the heat exchange tube inside the gas-liquid heat exchanger 4 is increased to above 5, and thick-walled deep spiral corrugated explosion-proof stainless steel pipes are used to ensure the safe use of the heat exchanger; the use of insulated gas pipes 6 and insulated air guns 7 can protect the operator during use to prevent high-temperature gas from injuring people.

[0039] After passing through the gas-liquid heat exchanger 4, the room temperature compressed air is heated into high-pressure hot air, which is then sent to the wax removal area after wax boiling through the insulated air pipe 6. The operator, manipulator or robot operates the insulated air gun 7 at the end of the insulated air pipe 6 to remove the wax from each chamber, air path and outer surface of the wax-boiled product.

[0040] The first control valve and the second control valve serve as gas path control switches at the gas inlet end and the gas outlet end on both sides of the gas-liquid heat exchanger 4, and adopt conventional plug valves.

[0041] A solenoid valve 2 is provided on the connecting pipeline of the compressed air supply system 1, and the solenoid valve 2 is provided between the first control valve and the gas-liquid exchanger. A sensor is provided in the gas-liquid exchanger for detecting whether the gas-liquid sensor is leaking. The solenoid valve 2 is electrically connected to the gas-liquid sensor.

[0042] The above-mentioned sensor is arranged in the gas-liquid heat exchanger 4, and is used to detect whether the gas-liquid heat exchanger 4 is leaking. The solenoid valve 2 arranged on the connecting pipeline of the compressed air supply system 1 is electrically connected to the sensor. When the sensor detects that the gas-liquid heat exchanger 4 is leaking, the solenoid valve 2 is controlled to be disconnected.

[0043] Furthermore, the solenoid valve 2 is an electrically controlled three-way valve, and the sensor is a differential pressure sensor.

[0044] The above-mentioned differential pressure sensor is used to detect the pressure in the heat exchange tube of the gas-liquid heat exchanger 4. When the detected higher differential pressure changes, it is a leak, and a signal is sent to the control system to control the action of the electric three-way valve;

[0045] The above-mentioned solenoid valve 2 adopts an electrically controlled three-way valve, two of the interfaces of which are respectively connected to the connecting pipeline on one side of the compressed air supply system 1 and the connecting pipeline on one side of the gas-liquid heat exchanger 4, and the other interface is connected to the exhaust pipeline. When the pressure difference sensor detects a leak, a control signal is sent to the control system, and the control system controls the interface connected to the connecting pipeline on one side of the compressed air supply system 1 to be disconnected, and the interface connected to the exhaust pipe to be opened. While stopping the gas supply, the gas in the heat exchange tube of the gas-liquid heat exchanger 4 is quickly discharged through the exhaust pipe.

[0046] A splash-proof damping cover 5 is arranged above the gas-liquid exchanger, and the splash-proof damping cover 5 is fixed in the electric heating wax tank 3 .

[0047] The provision of the splash-proof damping cover 5 can suppress the splashing caused by leakage of the high-pressure pipeline and protect the heating wax tank and other equipment.

[0048] When using the above-mentioned high-pressure hot air device, the compressed air supply system 1, the electric-controlled three-way valve, the electric heating wax tank 3, the gas-liquid heat exchanger 4, the splash-proof damping cover 5, the insulated air pipe 6, and the insulated air gun 7 are confirmed to be in normal working order. The electric heating wax tank 3 is started, and when the temperature of the liquid wax in the electric heating wax tank 2 reaches the working temperature, the air supply valve of the compressed air supply system 1 is opened, and the compressed air flows through the gas-liquid heat exchanger 4 and is heated into high-pressure hot air.

[0049] The wax blowing operator, manipulator or robot holds the heat-insulating air gun 7 and uses high-pressure hot air to blow away the residual wax inside the workpiece. The device has a simple structure, is safe and reliable, and can blow away the residual wax inside a wax-boiled product in 2 to 3 minutes. The use of the device solves the problem of residual wax not being completely removed from the inner cavity of the wax-boiled workpiece. It provides a reliable guarantee for the wax-boiled product to meet the technical requirements. The device can save energy, has high efficiency, saves man-hours, and reduces production costs.

[0050] The above specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0051] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). To make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

[0052] The above is a relatively specific and detailed description of the utility model through general description and specific embodiments. It should be pointed out that, without departing from the concept of the utility model, it is obvious that several variations and improvements can be made to these specific embodiments, which all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application shall be based on the attached claims.

Claims

1. A high-pressure hot air device for removing residual wax, characterized in that: include: A compressed air supply system (1), used for providing compressed air; A gas-liquid heat exchanger (4), the input end of the gas-liquid heat exchanger (4) is connected to a connecting pipeline of a compressed air supply system (1), and the gas-liquid heat exchanger (4) is arranged in the electric heating wax tank (3); an insulated gas pipeline (6), wherein the gas inlet end of the insulated gas pipeline (6) is connected to the output end of the gas-liquid heat exchanger (4); A heat-insulating air gun (7), the heat-insulating air gun (7) being connected to the air outlet end of the heat-insulating air pipe (6); A first control valve, the first control valve being arranged on a connecting pipeline of the compressed air supply system (1) and being used for controlling the on-off of the connecting pipeline; A second control valve, wherein the second control valve is arranged on the heat-insulated gas pipeline (6) and is used to control the on-off of the gas path of the heat-insulated gas pipeline (6).

2. A high-pressure hot air device for removing residual wax according to claim 1, characterized in that: A solenoid valve (2) is provided on the connecting pipeline of the compressed air supply system (1), and the solenoid valve (2) is provided between the first control valve and the gas-liquid exchanger. A sensor is provided in the gas-liquid exchanger for detecting whether the gas-liquid exchanger is leaking. The solenoid valve (2) is electrically connected to the sensor in the gas-liquid exchanger.

3. A high-pressure hot air device for removing residual wax according to claim 1, characterized in that: The first control valve and the second control valve are both plug valves.

4. A high-pressure hot air device for removing residual wax according to claim 2, characterized in that: The solenoid valve (2) is an electrically controlled three-way valve, and the sensor is a differential pressure sensor.

5. A high-pressure hot air device for removing residual wax according to claim 4, characterized in that: A splash-proof damping cover (5) is arranged above the gas-liquid exchanger, and the splash-proof damping cover (5) is fixed in the electric heating wax tank (3).

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