Triple-eccentric valve body surfacing heating device

Abstract

The utility model relates to a three-eccentric valve body surfacing heating device, a valve body is installed on a rotary table of a welding positioner, an eccentric boss forming a sealing face is arranged in the middle of the inner wall face of an inner cavity of the valve body, the heating device comprises a heating power source, an induction heater and a heating coil, the heating power source is connected with the induction heater through a circuit, and the heating coil is connected with the induction heater through a circuit. The induction heater is in circuit connection with the heating coil, the heating coil is sleeved on the eccentric boss, and along with rotation of the valve body, the heating coil is in clearance fit with the periphery of the eccentric boss so as to transfer heat to the surface of the eccentric boss. An induction heating method is adopted, the heating coil is attached to the eccentric boss forming the sealing face of the valve body in a following mode, heat generated by the heating coil can be completely transmitted to the surface of the built-up welding eccentric boss, the purpose that the temperature of the built-up welding face rises rapidly is achieved, heat loss is reduced, and the heating device is simple in structure, convenient to use and low in cost. Multi-person operation is not needed, the production cost is saved, and the working efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding process technical field especially a kind of three eccentric valve body surfacing heating device. BACKGROUND

[0002] The sealing surface of the valve body of three eccentric butterfly valve is a section of conical surface, and cobalt-based hard alloy surfacing is needed for the sealing surface, and local or overall heating is needed for the sealing surface before surfacing, so as to reduce the internal stress caused by temperature difference and cause the cracking of the valve body surfacing layer.

[0003] The existing method for heating the sealing surface of large-diameter three eccentric valve body generally uses oxyacetylene flame heating gun to heat, the valve body is clamped on the rotating workbench, the flame spray gun is aimed at the valve body surfacing position to start heating, and the valve body rotates during heating, and the spray gun does not rotate, so as to achieve the purpose of preheating the sealing surface of the valve body.

[0004] However, the heating cost of three eccentric valve body is high, the gas is seriously lost during heating, the heat cannot be fully utilized, the heating time is long, the heating efficiency is low, and the uneven temperature during heating can easily cause the cracking of the surfacing layer during welding, so the surfacing layer needs to be repaired, thereby affecting the normal production order of three eccentric butterfly valve. INVENTION CONTENTS

[0005] The utility model solves the technical problems: in order to overcome the deficiencies in the prior art, the utility model provides a kind of three eccentric valve body surfacing heating device that can reduce heat loss, improve heating efficiency and reduce production cost.

[0006] The technical scheme adopted by the utility model to solve its technical problems is: a kind of three eccentric valve body surfacing heating device, the valve body is installed on the rotating table of welding positioner, the inner cavity inner wall surface middle part of valve body has the eccentric boss forming sealing surface, the heating device includes heating power supply, induction heater and heating coil, heating power supply is connected with induction heater circuit, induction heater is connected with heating coil circuit, the heating coil is sleeved on the eccentric boss, and the heating coil is combined with the eccentric boss periphery gap to transfer heat to the eccentric boss with the rotation of the valve body.

[0007] Further, in order to fix the heating coil and transmit current, two right-angle pipes are provided between the induction heater and the heating coil, the horizontal end of the right-angle pipe is fixedly connected with the induction heater, the vertical end of the right-angle pipe is fixedly connected with the heating coil, and the wire led out of the induction heater is electrically connected with the heating coil through the right-angle pipe.

[0008] Specifically, the heating coil structure comprises upper arc plates and lower arc plates, end columns are fixedly connected between two ends of the upper arc plates and the lower arc plates, the lower end surface of the upper arc plate, the upper end surface of the lower arc plate and the inner side surface of the end columns form an arc-shaped groove which is matched with the eccentric boss, and the straight-angle pipes are fixed with the upper end surface of the upper arc plate.

[0009] The utility model discloses the beneficial effect is: the utility model discloses the method of inductive heating, with the eccentric boss of the valve body sealing surface of the heating coil and constitute type adhesion, the heat generated by heating coil can be completely transmitted to the surface of the surfacing eccentric boss, reach the purpose of surfacing surface temperature rapid rise, reduce heat loss. BRIEF DESCRIPTION OF DRAWINGS

[0010] The utility model is further illustrated below in connection with the drawings and implementation.

[0011] Figure 1 It is the structure schematic diagram of the utility model.

[0012] Figure 2 It is the structure schematic diagram of the heating coil of the utility model.

[0013] In the drawing: 1. valve body, 1-1. eccentric boss, 2. rotating table, 3. heating power supply, 4. inductive heater, 5. heating coil, 5-1. upper arc plate, 5-2. lower arc plate, 5-3. end column, 6. straight-angle pipe. DETAILED DESCRIPTION

[0014] The utility model is further illustrated below in connection with the drawings and implementation.

[0015] As Figure 1 The utility model discloses a kind of three eccentric valve body surfacing heating devices, when cobalt-based hard alloy surfacing is carried out on the sealing surface of the valve body 1 of three eccentric butterfly valve, the sealing surface needs to be heated locally or as a whole, to prevent the cracking phenomenon of valve body 1 surfacing layer caused by internal stress due to temperature difference. When surfacing, the valve body 1 described is installed on the rotating table 2 of welding positioner, and the inner circle surface of the eccentric boss 1-1 in the middle of the inner cavity inner wall surface of valve body 1 forms the sealing surface of valve body 1.

[0016] The heating device includes heating power supply 3, inductive heater 4 and heating coil 5, heating power supply 3 is connected with inductive heater 4, inductive heater 4 is connected with heating coil 5, and two straight-angle pipes 6 are provided between inductive heater 4 and heating coil 5.

[0017] As Figure 2As shown, the heating coil 5 comprises upper arc plate 5-1 and lower arc plate 5-2, end upright column 5-3 is fixed at both ends of the upper arc plate 5-1 and lower arc plate 5-2 respectively, the lower end surface of the upper arc plate 5-1, the upper end surface of the lower arc plate 5-2 and the inner side surface of the end upright column 5-3 form an arc-shaped slot 7 which is matched with the eccentric boss 1-1, the heating coil 5 is sleeved on the eccentric boss 1-1 through the arc-shaped slot 7, and the heating coil 5 is matched with the periphery gap of the eccentric boss 1-1 when the valve body 1 rotates, so that heat is transmitted to the eccentric boss 1-1.

[0018] The horizontal end of the right-angle pipe 6 is fixed with the induction heater 4, the vertical end of the right-angle pipe 6 is fixed with the upper end surface of the upper arc plate 5-1 of the heating coil 5, and the lead wire of the induction heater 4 passes through the right-angle pipe 6 and is electrically connected with the heating coil 5.

[0019] When heating, the heating coil 5 remains stationary, and the valve body 1 rotates with the rotating table 2 of the welding displacement machine, since the heating rate of the heating coil 5 is fast, the whole sealing surface of the valve body 1 can be heated, and the heating coil 5 does not interfere with the valve body 1 during welding, so that the purpose of heating and surfacing simultaneously is achieved.

[0020] The utility model adopts the method of induction heating, and the heating coil 5 is matched with the eccentric boss 1-1 which constitutes the sealing surface of the valve body 1, so that the heat generated by the heating coil 5 can be completely transmitted to the surface of the surfacing eccentric boss 1-1, the purpose of rapid temperature rise of the surfacing surface is achieved, and heat loss is reduced.

[0021] Based on the above ideal embodiment of the utility model, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A heating device for overlay welding of a triple eccentric valve body, wherein the valve body (1) is mounted on the rotary table (2) of a welding positioner, and the inner wall of the valve body (1) has an eccentric boss (1-1) forming a sealing surface in the middle part of the inner cavity wall, characterized in that: The heating device includes a heating power supply (3), an induction heater (4), and a heating coil (5). The heating power supply (3) is connected to the induction heater (4) by a circuit, and the induction heater (4) is connected to the heating coil (5) by a circuit. The heating coil (5) is mounted on an eccentric boss (1-1). As the valve body (1) rotates, the heating coil (5) and the eccentric boss (1-1) are in close contact with each other, thereby transferring heat to the eccentric boss (1-1).

2. The triple eccentric valve body overlay welding heating device as described in claim 1, characterized in that: Two right-angle tubes (6) are provided between the induction heater (4) and the heating coil (5). The horizontal end of the right-angle tube (6) is fixed to the induction heater (4), and the vertical end of the right-angle tube (6) is fixed to the heating coil (5). The wires led out from the induction heater (4) pass through the right-angle tube (6) and are electrically connected to the heating coil (5).

3. The triple eccentric valve body overlay welding heating device as described in claim 2, characterized in that: The heating coil (5) includes an upper arc plate (5-1) and a lower arc plate (5-2). An end post (5-3) is fixed between the two ends of the upper arc plate (5-1) and the lower arc plate (5-2). The lower end face of the upper arc plate (5-1), the upper end face of the lower arc plate (5-2) and the inner side of the end post (5-3) form an arc groove (7) that matches the eccentric boss (1-1). The right-angle tube (6) is fixed to the upper end face of the upper arc plate (5-1).

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