Die preheating heater

Abstract

The utility model relates to a mould preheating heater which comprises a U-shaped cavity pipeline, the middle of the inner wall of the U-shaped cavity pipeline is outwards communicated with an extension pipeline, the other end of the extension pipeline is communicated with an arc-shaped pipeline, and a plurality of flame nozzles are respectively communicated and distributed on the upper wall surface and the lower wall surface of the U-shaped cavity pipeline and the arc-shaped pipeline along the extension direction; the two side ends of the U-shaped cavity pipeline are internally and outwards communicated with air inlet pipes respectively, the two air inlet pipes are jointly communicated with a main air pipe, and a switch valve is arranged on the main air pipe. A support frame is connected below the middle parts of the two air inlet pipes; a magnetic block is arranged at the bottom end of the support frame; an electrode bar is arranged on the side portion of one gas inlet pipe, and the head end of the electrode bar is located above one flame nozzle on the U-shaped cavity pipeline. According to the utility model, heat is transferred into the cavity from the outer side through uniform heating of the outer side of the mold closing surface, so that uniform heat distribution of the whole mold is ensured, heat radiation generated by combustion further assists in heating the surface of the cavity, and the preheating efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to foundry mould technical field, specifically, it shows a mould preheating heater. BACKGROUND

[0002] Low pressure casting is a commonly used casting process, which is used for manufacturing various metal products, such as automobile parts, industrial machinery parts, etc. In the casting process, the preheating of the mould is one of the important links to ensure the quality of the casting, especially before the mould surface is sprayed with paint, the mould temperature needs to reach a uniform and appropriate range, so as to ensure the adhesion of the paint, thereby improving the surface quality of the casting.

[0003] At present, the following two mould preheating methods are mainly used in the industry:

[0004] 1. Oven heating

[0005] Advantages: oven heating can provide relatively uniform temperature distribution, which is suitable for moulds of various shapes and sizes, especially in the aspect of realizing overall heating on the surface of complex moulds.

[0006] Disadvantages: low heating efficiency, long mould preheating time, affecting production rhythm; high energy consumption, especially when frequent heating or large moulds are used, the cost of this method is difficult to control; large equipment space occupation, difficult to adapt to the compact layout requirements of modern production lines.

[0007] 2. Torch heating

[0008] Advantages: torch heating has the characteristics of rapid heating, which is suitable for small moulds or conditions that need to complete preheating in a short time.

[0009] Disadvantages: uneven heating, local overheating may occur in the concentrated area of the flame, while the complex parts of the mould (such as grooves and edges) may be insufficiently heated, affecting the adhesion effect of the paint; high-temperature flame may cause thermal stress concentration phenomenon in the local material of the mould, which may cause micro-cracks or fatigue damage, seriously affecting the service life of the mould. INVENTION CONTENTS

[0010] The utility model aims at providing a mould preheating heater to solve the above technical problems.

[0011] The technical scheme is as follows:

[0012] A mould preheating heater, comprising a U-shaped cavity pipeline, which is hollow inside, and a plurality of flame nozzles are arranged on the upper and lower wall surfaces of the U-shaped cavity pipeline along the extension direction thereof and communicated respectively;

[0013] The inner wall of the U-shaped cavity pipeline is communicated with an extension pipeline, the other end of the extension pipeline is communicated with an arc-shaped pipeline, and the upper and lower walls of the arc-shaped pipeline are respectively communicated with a plurality of flame nozzles along the extension direction thereof;

[0014] The inner wall of the U-shaped cavity pipeline is communicated with an extension pipeline, the other end of the extension pipeline is communicated with an arc-shaped pipeline, and the upper and lower walls of the arc-shaped pipeline are respectively communicated with a plurality of flame nozzles along the extension direction thereof;

[0015] The middle part of the two gas inlet pipes is connected with a support frame, and the bottom end of the support frame is provided with a magnetic block.

[0016] One side of one of the gas inlet pipes is provided with an electrode rod, and the head end of the electrode rod is above one of the flame nozzles of the U-shaped cavity pipeline.

[0017] Further, the U-shaped cavity pipeline and the arc-shaped pipeline are horizontally arranged, the two gas inlet pipes are inclinedly arranged, and the arrangement height of the magnetic block is higher than the arrangement height of the U-shaped cavity pipeline. The U-shaped cavity pipeline and the arc-shaped pipeline are arranged outside the mold closing surface position of the mold, and heat is transferred to the mold cavity surface in a heat conduction and heat radiation manner. The gas inlet pipe is arranged outside the mold, and therefore needs to be inclinedly arranged.

[0018] Further, an adjusting gasket is arranged between the support frame and the magnetic block, and the adjusting gasket is fixedly connected with the support frame and the magnetic block through bolts. Different thickness adjusting gaskets are replaced according to different molds, so as to reasonably adjust the distance between the U-shaped cavity pipeline and the mold closing surface outside the mold.

[0019] Further, the support frame comprises a bottom plate and two connecting frames symmetrically arranged on the top of the bottom plate, and the connecting frames are upwardly connected with the gas inlet pipes. The connecting frames and the gas inlet pipes are weldedly connected, so as to improve the structural stability.

[0020] Further, the flame nozzles are vertically arranged on the upper and lower walls of the U-shaped cavity pipeline and the arc-shaped pipeline. The flame nozzles are vertically arranged on the upper and lower walls of the arc-shaped pipeline. The flame better covers the mold closing surface outside the mold.

[0021] Further, the arrangement height of the arc-shaped pipeline is lower than the arrangement height of the U-shaped cavity pipeline. The arc-shaped pipeline is slightly away from the mold closing surface outside the mold, so as to avoid that the flame generated by the flame nozzles on the arc-shaped pipeline directly acts on the mold closing surface outside the mold.

[0022] Further, the head end of the electrode rod is provided with a temperature sensor. When the flame is extinguished, the external equipment senses through the temperature sensor on the electrode, so as to cut off the gas supply.

[0023] Compared with the prior art, the mould preheating heater has the advantages that, unlike the traditional torch direct heating, the flame of the heater does not directly contact the molding surface of the mold cavity, but the outside of the mold closing surface is heated, heat is transferred to the cavity surface in the mode of heat conduction and heat radiation, local overheating or damage to the mold surface is avoided, heat is transferred from the outside to the cavity through the uniform heating of the outside of the mold closing surface, the heat distribution of the whole mold is ensured to be uniform, the heat radiation generated by combustion further assists in heating the cavity surface, and the preheating efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic view of a mould preheating heater according to an embodiment of the present application;

[0025] Figure 2 is a related schematic view of a support frame part according to an embodiment of the present application;

[0026] Figure 3 is Figure 1 is a local enlarged schematic view of part A in the figure;

[0027] Relevant marks in the figure: 1-U cavity pipeline, 2-flame nozzle, 3-extended pipeline, 4-arc pipeline, 5-air inlet pipe, 6-total gas pipe, 7-electrode rod, 8-support frame, 9-magnetic block, 10-adjusting gasket, 61-switching valve, 62-three-way head, 71-fixing piece, 72-temperature sensor, 81-bottom plate, 82-connecting frame. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application

[0029] The embodiments of the present application provide a mould preheating heater, which is used to solve the technical problems in the background art.

[0030] Please refer to Figure 1 , Figure 2 , Figure 3As shown. Mainly including U type cavity pipeline 1, its inside hollow, in the upper and lower wall surface of U type cavity pipeline 1 respectively along its extension direction is communicated with several flame nozzles 2, double-sided flame spraying;In the inner wall of U type cavity pipeline 1 middle outwardly communicates an extension pipeline 3, the other end of extension pipeline 3 communicates an arc pipeline 4, arc pipeline 4 is at the middle position of U type cavity pipeline 1, the upper and lower wall surface of arc pipeline 4 also respectively along its extension direction is communicated with several flame nozzles 2, double-sided flame spraying;The inside of both sides end of U type cavity pipeline 1 respectively outwardly communicates air inlet pipe 5, two air inlet pipes 5 pass through tee head 62 common communication total gas pipe 6, total gas pipe 6 is provided with switch valve 61;The middle part below of two air inlet pipes 5 is commonly connected with support frame 8, the bottom end of support frame 8 is provided with magnetic block 9, utilizes the magnetic attraction of magnetic block and metal mold to realize the fixation of the heater, and the disassembly is convenient;The side of one of air inlet pipes 5 is provided with electrode stick 7 through fixing piece 71, the head end of electrode stick 7 is above one of flame nozzles 2 on U type cavity pipeline 1, electrode stick 7 can be ignited after electrification, so as to realize the ignition operation of all flame nozzles.

[0031] By electrode stick ignition, use air and gas mixture as combustion medium to ensure sufficient combustion, controllable flame temperature, provide stable heat source, combustion medium is shunted to air inlet pipe through total gas pipe and enters U type cavity pipeline. Unlike traditional torch direct heating, the flame of the heater does not directly contact the mold cavity forming surface, but heats the mold outside the closing surface, which transmits heat to the cavity surface by heat conduction and radiation, avoiding local overheating or damaging the mold surface. Heat conduction: through uniform heating outside the mold closing surface, heat is transferred from the outside to the cavity, ensuring uniform heat distribution of the entire mold;Heat radiation: heat radiation generated by combustion further assists in heating the cavity surface, improving preheating efficiency.

[0032] It is worth noting that U type cavity pipeline 1, arc pipeline 4 are horizontally arranged, two air inlet pipes 5 are inclinedly arranged, and the arrangement height of magnetic block 9 is higher than that of U type cavity pipeline 1. U type cavity pipeline and arc pipeline are arranged at the position of mold outside closing surface, which transmits heat to the mold cavity surface by heat conduction and radiation, and air inlet pipe is arranged outside the mold, so it needs to be inclinedly arranged.

[0033] In one embodiment, an adjusting gasket 10 is arranged between the support frame 8 and the magnetic block 9, and the adjusting gasket 10 is fixedly connected with the support frame 8 and the magnetic block 9 by bolts. Different thickness adjusting gaskets are replaced according to different molds to raise the height of the heater, thereby reasonably adjusting the distance between the U type cavity pipeline and the mold outside closing surface.

[0034] The support frame 8 comprises a bottom plate 81 and two connecting frames 82 symmetrically arranged on the top of the bottom plate 81, and the connecting frames 82 are upwardly connected to the air inlet pipe 5. The connecting frames are welded with the air inlet pipe, so that the structural stability is improved.

[0035] It is worth noting that the flame nozzles 2 are vertically arranged on the upper and lower wall surfaces of the U-shaped cavity pipe 1, and the flame nozzles 2 are vertically arranged on the upper and lower wall surfaces of the arc-shaped pipe 4. In this way, the flame can better cover the mold outside die surface.

[0036] The arrangement height of the arc-shaped pipe 4 is lower than that of the U-shaped cavity pipe 1. The arc-shaped pipe is slightly away from the mold outside die surface, so that the flame generated by the flame nozzle on the arc-shaped pipe is not directly applied to the mold outside die surface.

[0037] In one embodiment, the head end of the electrode rod 7 is provided with a temperature sensor 72. Generally, during the mold preheating process, the temperature change of the key position of the mold is monitored in real time by means of a thermocouple, and the signal is transmitted to an external control device. When the temperature of the detection point reaches the preset value, the control device automatically cuts off the air and gas mixture supply, so as to stop heating and avoid unnecessary energy waste. Intelligent temperature control can be realized. When the flame is extinguished, the external device senses it through the temperature sensor on the electrode and feeds back to the external control device, so as to cut off the gas supply.

[0038] The above only describes some embodiments of the present application. For ordinary skilled persons in the art, without departing from the creative concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application.

Claims

1. A mold preheating heater characterized by, Including U type cavity pipeline (1), its inside hollow, the upper and lower wall surface of the U type cavity pipeline (1) is respectively along its extension direction and is provided with several flame nozzles (2) in communication; The inner wall of the U type cavity pipeline (1) is outwardly communicated with an extension pipeline (3) in the middle, the other end of the extension pipeline (3) is communicated with an arc pipeline (4), the upper and lower wall surface of the arc pipeline (4) is respectively provided with several flame nozzles (2) in communication along its extension direction; The two side ends of the U type cavity pipeline (1) are respectively outwardly communicated with air inlet pipes (5), two air inlet pipes (5) are commonly communicated with a total air pipe (6), the total air pipe (6) is provided with a switch valve (61) on it; The middle part of the two air inlet pipes (5) is commonly connected with a support frame (8), the bottom end of the support frame (8) is provided with a magnetic block (9); The side part of one of the air inlet pipes (5) is provided with an electrode stick (7), the head end of the electrode stick (7) is above one of the flame nozzles (2) of the U type cavity pipeline (1).

2. A mould preheating heater according to claim 1, characterised in that The U type cavity pipeline (1) and the arc pipeline (4) are horizontally arranged, the two air inlet pipes (5) are obliquely arranged, the arrangement height of the magnetic block (9) is higher than the arrangement height of the U type cavity pipeline (1).

3. A mold preheating heater according to claim 1, wherein Adjusting washers (10) are arranged between the support frame (8) and the magnetic block (9), the adjusting washers (10) are respectively fixedly connected with the support frame (8) and the magnetic block (9) through bolts.

4. A mould preheating heater according to claim 3, characterised in that The support frame (8) comprises a bottom plate (81) and two connecting frames (82) symmetrically arranged on the top of the bottom plate (81), the connecting frames (82) are upwardly connected with the air inlet pipes (5).

5. A mold preheating heater according to claim 1, wherein The flame nozzles (2) are vertically arranged on the upper and lower wall surfaces of the U type cavity pipeline (1), the flame nozzles (2) are vertically arranged on the upper and lower wall surfaces of the arc pipeline (4).

6. A mold preheating heater as defined in claim 1, wherein The arrangement height of the arc pipeline (4) is lower than the arrangement height of the U type cavity pipeline (1).

7. A mold preheating heater as defined in claim 1, wherein The head end of the electrode stick (7) is provided with a temperature sensor (72).

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