Circumferential weld joint welding heat preservation device and welding method in wind power equipment machining

Abstract

The invention belongs to the technical field of wind power equipment machining, and provides a circumferential weld joint welding heat preservation device and a welding method in wind power equipment machining. The heat preservation shell comprises a first shell body and a second shell body which are connected with each other. A first connecting piece is arranged at the end part of the first shell, and a second connecting piece is arranged at the end part of the second shell; a first pressure release valve is arranged on the first shell, and a second pressure release valve is arranged on the second shell; during welding, the first shell and the second shell are separated at the joint, a welding gun is inserted into the joint of the first shell and the second shell for welding, welding of the welding gun and closing of the first shell and the second shell after welding are met through closing of the first shell and the second shell at the joint, and the purpose of continuous heat preservation is achieved; by means of the heat preservation shell, heat generated by welding is used for directly conducting heat preservation on a welding seam, the heating link is replaced, on the basis that resources and cost are saved, a good working environment is provided, and the machining risk is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power equipment processing, and in particular relates to a circumferential weld welding insulation device and a welding method in wind power equipment processing. Background Art

[0002] When processing wind power equipment such as wind power steel structure monopiles and towers, the circumferential welds are heated by flames during the plate preheating and weld post-heating process. There are fewer heating points, making it difficult to achieve uniform heating and continuous insulation to the same temperature after heating.

[0003] The inventors found that in the processing of wind power equipment, the preheating temperature of the circumferential weld welding plate is required by the relevant specifications of the processing plant to be 120°~200°, and the post-heating temperature of the weld is required to be 200°~300°, with continuous insulation for more than 1 hour; currently, flame heating is used for continuous heating for a specified time, and the instantaneous temperature can meet the requirements of the relevant specifications, but it is difficult to achieve continuous insulation without the installation of relevant insulation devices; and in the summer when the temperature of the construction plant is high, according to the safety requirements of the processing plant, each worker is required to dress neatly to prevent burns. The welding of the circumferential weld in the processing plant is heated by flame at the bottom of the cylinder, and the welding workers use semi-automatic submerged arc welding technology at the upper end for welding, which can easily cause heat stroke and pose a safety hazard. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a circumferential weld welding insulation device and a welding method in the processing of wind power equipment. During welding, the first shell and the second shell are separated at the connection, and the welding gun is inserted into the connection of the first shell and the second shell for welding. The closure of the first shell and the second shell at the connection satisfies the welding of the welding gun. After welding, the first shell and the second shell are closed, and the purpose of continuous insulation is achieved. With the help of the insulation shell, the heat generated by welding is used to directly insulate the weld, replacing the heating link. On the basis of saving resources and costs, a good working environment is provided for welding workers and managers, and the processing risk is reduced. At the same time, through the setting of the first pressure relief valve and the second pressure relief valve, after the temperature is higher than the required temperature, the temperature is reduced by pressure relief, thereby avoiding the problem of excessive temperature.

[0005] In order to achieve the above-mentioned purpose, in a first aspect, the present invention provides a circumferential weld welding insulation device in wind power equipment processing, which adopts the following technical scheme:

[0006] A circumferential weld welding heat preservation device in wind power equipment processing, comprising at least one heat preservation shell;

[0007] The heat-insulating shell comprises a first shell and a second shell connected to each other; a first connecting piece is provided at an end of the first shell away from the second shell, and a second connecting piece is provided at an end of the second shell away from the first shell; a first pressure relief valve is provided on the first shell, and a second pressure relief valve is provided on the second shell;

[0008] The first shell and the second shell are connected to the welding object through the first connecting piece and the second connecting piece respectively; during welding, the first shell and the second shell are separated at the connection, and the welding gun is inserted into the connection between the first shell and the second shell for welding. After welding, the first shell and the second shell are closed; when the pressure in the thermal insulation shell exceeds the first preset pressure, the first pressure relief valve and the second pressure relief valve are opened to relieve pressure.

[0009] Furthermore, the first connecting member and the second connecting member are both configured as electromagnetic devices.

[0010] Furthermore, a guide member is provided at the connection between the first shell and the second shell; the guide member includes a first electromagnet provided on the first shell, and a second electromagnet provided on the second shell.

[0011] Furthermore, the heat generated by welding and the heat required for thermal insulation are calculated separately; on the basis that the heat generated by welding meets the heat demand for thermal insulation, if the difference between the heat generated by welding and the heat required for thermal insulation exceeds a preset value, then when the pressure in the thermal insulation shell exceeds a second preset pressure, the first pressure relief valve and the second pressure relief valve open to relieve pressure, and the second preset pressure is less than the first preset pressure.

[0012] Furthermore, the first shell and the second shell both include an inner thermal insulation layer and an outer thermal insulation layer arranged on the inner thermal insulation layer; the inner thermal insulation layer is a flexible metal.

[0013] In order to achieve the above-mentioned purpose, in a second aspect, the present invention also provides a circumferential weld welding method in wind power equipment processing, which adopts the following technical solution:

[0014] A method for welding a circumferential weld in wind power equipment processing, using the circumferential weld welding insulation device in wind power equipment processing as described in the first aspect, comprising: separating the first shell and the second shell at a connection, inserting a welding gun into the connection between the first shell and the second shell for welding, and closing the first shell and the second shell for insulation after welding;

[0015] When the pressure in the heat-insulating shell exceeds a first preset pressure, the first pressure relief valve and the second pressure relief valve open to relieve pressure.

[0016] Furthermore, the heat generated by welding and the heat required for thermal insulation are calculated separately; on the basis that the heat generated by welding meets the heat demand for thermal insulation, if the difference between the heat generated by welding and the heat required for thermal insulation exceeds a preset value, then when the pressure in the thermal insulation shell exceeds a second preset pressure, the first pressure relief valve and the second pressure relief valve open to relieve pressure, and the second preset pressure is less than the first preset pressure.

[0017] Furthermore, the heat generated by the welding is equal to the ratio of the product of the arc power effective utilization coefficient, the welding current and the arc voltage to the welding speed.

[0018] Furthermore, the heat required for insulation is equal to the product of specific heat capacity, air mass in the insulation shell and temperature change.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention comprises at least one heat-insulating shell; the heat-insulating shell comprises a first shell and a second shell connected to each other; a first connector is provided at the end of the first shell away from the second shell, and a second connector is provided at the end of the second shell away from the first shell; a first pressure relief valve is provided on the first shell, and a second pressure relief valve is provided on the second shell; the first shell and the second shell are connected to a welding object through the first connector and the second connector respectively; during welding, the first shell and the second shell are separated at the connection, and a welding gun is inserted into the connection of the first shell and the second shell for welding, and the first shell and the second shell are closed at the connection to meet the welding of the welding gun. After welding, the first shell and the second shell are closed to achieve the purpose of continuous heat preservation; with the help of the heat-insulating shell, the heat generated by welding is used to directly insulate the weld, replacing the heating link, and on the basis of saving resources and costs, a good working environment is provided for welding workers and managers, and processing risks are reduced; at the same time, through the provision of the first pressure relief valve and the second pressure relief valve, after the temperature is higher than the required temperature, the temperature is reduced by pressure relief, thereby avoiding the problem of excessive temperature.

[0021] 2. Compared with traditional flame heating, the present invention uses the heat after welding for heat preservation, which reduces the hidden dangers of on-site welding, ensures the safety of welding workers, and reduces the phenomenon of heat stroke in summer construction. On the other hand, it can save resources, reduce welding costs, improve welding quality, and has a simple structure and relatively low cost.

[0022] 3. In the present invention, by setting the first pressure relief valve and the second pressure relief valve, after the temperature is higher than the required temperature, the temperature is lowered by means of pressure relief, thereby avoiding the problem of excessive temperature; at the same time, a calculation method for the heat generated by welding and the insulation requirement is designed, and on the basis that the heat generated by welding meets the heat requirement for insulation, if the difference between the heat generated by welding and the heat required for insulation exceeds a preset value, then when the pressure in the insulation shell exceeds the second preset pressure, pressure relief is performed in advance, thereby avoiding the problem of excessive temperature rise before pressure relief due to the large heat generated by welding, and improving the pressure relief control accuracy and welding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0024] Figure 1 This is a schematic structural diagram of a heat preservation device according to Embodiment 1 of the present invention;

[0025] Figure 2 This is a state diagram of the heat preservation device of Example 1 of the present invention during welding;

[0026] Among them, 100, insulation shell; 101, first shell; 102, second shell; 103, first pressure relief valve; 104, second pressure relief valve; 105, first connecting piece; 106, second connecting piece; 107, inner insulation layer; 108, outer insulation layer; 109, guide piece; 1091, first electromagnet; 1092, second electromagnet; 200, welding gun. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0029] The term "connection" in the present invention may refer to a temporary contact connection between two objects, or to two objects being combined together by other external forces or components, or other conventional connection methods.

[0030] Embodiment 1:

[0031] like Figure 1 As shown, this embodiment provides a circumferential weld welding insulation device in wind power equipment processing, including at least one insulation shell 100;

[0032] The heat-insulating shell 100 includes a first shell 101 and a second shell 102 connected to each other; a first connecting piece 105 is provided at an end of the first shell 101 away from the second shell 102, and a second connecting piece 106 is provided at an end of the second shell 102 away from the first shell 101; a first pressure relief valve 103 is provided on the first shell 101, and a second pressure relief valve 104 is provided on the second shell 102;

[0033] The first shell 101 and the second shell 102 are connected to a welding object through the first connecting member 105 and the second connecting member 106 respectively. The welding object may be a wind power steel structure monopile or tower or other equipment; Figure 2 As shown, during welding, the first shell 101 and the second shell 102 are separated at the connection, and the welding gun 200 is inserted into the connection between the first shell 101 and the second shell 102 for welding. After welding, the first shell 101 and the second shell 102 are closed, thereby achieving the purpose of continuous insulation. With the help of the insulation shell 100, the heat generated by welding is used to directly insulate the weld, replacing the heating link. On the basis of saving resources and costs, a good working environment is provided for welding workers and managers, and processing risks are reduced.

[0034] Optionally, the heat-insulating shell 100 is a door-type structure, and the first shell 101 and the second shell 102 each include two plate-like bodies perpendicular to each other; the connection between the first shell 101 and the second shell 102 is a temporary connection that can be separated at any time.

[0035] In some embodiments, Figure 1 As shown, optionally, the first connector 105 and the second connector 106 are both configured as electromagnetic devices. It is understandable that the electromagnetic device at least includes an electromagnetic part that is arranged on the first shell 101 and the second shell 102 by a connection method such as bolts, and a power supply connected to the electromagnetic part, and the power supply is connected to a controller, and the controller can realize whether the first connector 105 and the second connector 106 are magnetic by controlling the power supply to power on or off the electromagnetic part. The first connector 105 and the second connector 106 are both configured as electromagnetic devices, and the insulation shell 100 can be connected to the welding object by magnetism, while meeting the flexible requirements when the insulation shell 100 is separated. For example, when the first connector 105 and the second connector 106 are fixedly connected, the first connector 105 and the second connector 106 are not easy to separate, which affects the welding of the welding gun 200.

[0036] In some embodiments, Figure 1As shown, optionally, a guide member 109 is provided at the connection between the first shell 101 and the second shell 102; the guide member 109 can be provided to include two arc-shaped structures respectively provided on the first shell 101 and the second shell 102, so as to guide the welding gun 200. Specifically, as Figure 2 As shown, when the welding gun 200 moves to the guide member 109, the first shell 101 and the second shell 102 can be pushed to both sides. At this time, there is a welding gap between the connection between the first shell 101 and the second shell 102, and the welding gun 200 moves from one side to the other side of the insulation shell 100 to achieve welding; the welding gun 200 can be a submerged arc welding welding tube, etc.

[0037] In other embodiments, Figure 2 As shown, the guide member 109 includes a first electromagnet 1091 disposed on the first housing 101, and a second electromagnet 1092 disposed on the second housing 102. It can be understood that the first electromagnet 1091 and the second electromagnet 1092 can respectively include an electromagnetic part disposed on the first housing 101 and the second housing 102, and a power supply connected to the electromagnetic part, the power supply is connected to a controller, and the controller can realize whether the first electromagnet 1091 and the second electromagnet 1092 are magnetic by controlling the power supply to power on or off the electromagnetic part. Specifically, when the welding gun 200 moves to the guide member 109, the control power supply is turned off, and the first electromagnet 1091 and the second electromagnet 1092 are non-magnetic, so that the welding gun 200 opens the connection between the first shell 101 and the second shell 102 with a small force; during the welding process or after welding, the control power supply is turned on, and the first electromagnet 1091 and the second electromagnet 1092 are magnetic. Through the mutual attraction between the first electromagnet 1091 and the second electromagnet 1092, the problem of excessive outward opening or even outward tilting of the first shell 101 and the second shell 102 during the welding process is avoided, and at the same time, the connection strength between the first shell 101 and the second shell 102 after welding is increased, thereby improving stability and thermal insulation.

[0038] In some embodiments, Figure 1 As shown, the first shell 101 and the second shell 102 both include an inner insulation layer 107 and an outer insulation layer 108 arranged on the inner insulation layer 107; optionally, the inner insulation layer 107 is a flexible metal, and the outer insulation layer 108 is a composite silicate insulation board or other composite insulation board, which ensures the insulation effect while improving the strength of the insulation shell 100.

[0039] In some embodiments, Figure 1As shown, there are multiple heat-insulating shells 100, and the multiple heat-insulating shells 100 are connected to the object along the circumferential weld, and the sides of adjacent heat-insulating shells 100 are in contact and connected, so that the entire circumferential weld is in a relatively closed space. It can be understood that the welding gun 200 passes through each heat-insulating shell 100 in turn for welding, and the heat-insulating shell 100 currently in the welding state is in an open state, while the other heat-insulating shells 100 are in a closed state, thereby avoiding heat dissipation; after the welding is completed, all the heat-insulating shells 100 are in a closed state, and the entire circumferential weld is in a relatively closed space, thereby ensuring the heat-insulating effect.

[0040] In some embodiments, the first pressure relief valve 103 and the second pressure relief valve 104 are control valves with controllable openings, the first pressure relief valve 103 and the second pressure relief valve 104 are connected to a controller, and pressure sensors are provided on the first pressure relief valve 103 and the second pressure relief valve 104, or pressure sensors are provided at other positions in the heat-insulating shell 100 to detect the pressure in real time. Specifically, when the pressure in the heat-insulating shell 100 exceeds the first preset pressure, the first pressure relief valve 103 and the second pressure relief valve 104 are opened to release the pressure, and the temperature is reduced by releasing the pressure, thereby avoiding the problem of excessive temperature.

[0041] In other embodiments, the heat generated by welding and the heat required for insulation are calculated separately; on the basis that the heat generated by welding meets the heat demand for insulation, if the difference between the heat generated by welding and the heat required for insulation exceeds a preset value, then when the pressure in the insulation shell 100 exceeds a second preset pressure, the first pressure relief valve 103 and the second pressure relief valve 104 are opened to relieve pressure, and the second preset pressure is less than the first preset pressure; when the pressure in the insulation shell exceeds the second preset pressure, the pressure is relieved in advance, thereby avoiding the problem of excessive temperature rise before pressure relief due to the large heat generated by welding, and improving the pressure relief control accuracy and welding effect.

[0042] In some embodiments, optionally, the working principle of the heat preservation device is to continuously generate heat during the submerged arc welding process until a predetermined temperature is reached, and the temperature can be continuously maintained at a constant temperature. First, the heat preservation device is added without changing the original welding process. The height of the heat preservation device is lower than the height of the roller of the semi-automatic submerged arc welding machine. The center of the heat preservation device coincides with the center of the semi-automatic submerged arc welding machine. The two wheelbases are greater than the width of the heat preservation device, ensuring that the semi-automatic welding machine can move normally along the circumferential weld. Secondly, a circumferential weld is composed of a plurality of heat preservation shells 100. Taking advantage of the characteristic of the semi-automatic welding machine to move at a uniform speed, a guide 109 is installed in the heat preservation shell 100. After the welding gun 200 hits the guide 109, the first shell 101 and the second shell 102 are opened at the connection under the force of the welding gun 200, and automatically closed after the welding is completed, and then enter the next section of the heat preservation shell 100 for welding until the entire weld is welded.

[0043] The insulation shell 100 is provided with a first pressure relief valve 103 and a second pressure relief valve 104. The heat generated by continuous welding is continuous, and the heat is concentrated in the insulation device. The temperature will continue to rise and the pressure will increase. For example, the relevant specifications require that the heat temperature after welding is 300°. If the temperature exceeds 300° and continues to rise, the performance of the plate may change and produce adverse factors. Therefore, the air pressure exceeds 1.1229*10 5 pa, the first pressure relief valve 103 and the second pressure relief valve 104 automatically open to release the pressure, and the air pressure is lower than 1.1229*10 5 After pa, the first pressure relief valve 103 and the second pressure relief valve 104 are automatically closed to achieve the goal of automatic temperature regulation. Finally, the main material of the inner insulation layer 107 is soft metal, which can be applied to preheating and post-heating of various pipe diameters. The outer insulation layer 108 is an auxiliary material. The superposition of the two can play a better insulation role.

[0044] In some embodiments, taking a cylinder with a diameter of 6 meters as an example, the heat generated by welding is calculated as:

[0045] q=n*In*Un / v

[0046] Among them, q is the heat generated by welding; n is the effective utilization coefficient of arc power, which is optional and has a value range of 0.8-0.95 for submerged arc welding; In is the welding current, which has an optional value range of 600-720; Un is the arc voltage, which has an optional value range of 27-33; v is the welding speed, which has a value range of 0.58cm / s-0.7cm / s; Substituting it into the equation, we get q=18.51kj / cm. The minimum energy generated by a 6-meter diameter cylindrical circumferential weld is: 18.51*6*3.14=348.73kj.

[0047] Assuming that the height and width of the insulation device are 10cm*10cm, the volume of the space to be heated can be calculated to be 0.093m 3 , air quality is about 1.29kg / m 3 The air quality in the insulation device is about 119.97g / m 3 The amount of heat required to increase the air temperature by one degree is calculated by the specific heat capacity of air, which is approximately 1.0035 j (g· degrees Celsius). The amount of heat required for insulation is: Heat = specific heat capacity * air mass in insulation device * temperature change.

[0048] It can be deduced that heating the air in the insulation device from zero degrees to three hundred degrees requires about 36.12 kj of energy, and the heat generated by welding is 348.73 kj, which meets the heating conditions of the insulation device in the technical specifications.

[0049] According to Avogadro's theorem:

[0050] PV=NRT

[0051] Among them, R is a constant of 8.31; V: volume; N: amount of gas substance, volume of gas under standard conditions / 22.4; T: temperature; the above can be deduced that the pressure P = 1.1229*10 5 pa.

[0052] During welding, after the welding gun 200 touches the guide member 109, the entire insulation shell 100 is opened to allow the semi-automatic submerged arc welding machine to pass smoothly and perform welding. A circumferential weld is composed of multiple insulation shell 100 modules, and the insulation shell 100 modules are only closed at the circumferential seam. After all the insulation shell 100 modules are installed, a completely closed effect can be achieved. During the welding process, the heat generated by submerged arc welding is used to achieve the purpose of insulation. The pressure increases during the temperature rise. By calculation, when the pressure reaches 1.1229mp, the temperature can reach 300 degrees. The relevant specifications of welding technology require that the post-heating temperature does not exceed 300 degrees. Exceeding 300 degrees can cause adverse factors to the weld and the plate. Therefore, the pressure relief valve of the insulation device is set at 1.1229mp as the critical value. When this range is exceeded, the first pressure relief valve 103 and the second pressure relief valve 104 are opened to automatically release the pressure and drive the temperature to decrease. When it is lower than 1.1229mp, the first pressure relief valve 103 and the second pressure relief valve 104 are automatically closed to achieve the purpose of automatic adjustment. The insulation device in this embodiment does not need to use flame heating to achieve welding insulation, which can effectively reduce the safety risks of the processing plant and ensure the safety of workers in construction. At the same time, it can also save resources and save costs.

[0053] Embodiment 2:

[0054] The present embodiment provides a method for welding circumferential welds in the processing of wind power equipment, using the circumferential weld welding insulation device in the processing of wind power equipment as described in Example 1, including: the first shell 101 and the second shell 102 are separated at the connection, the welding gun 200 is inserted into the connection between the first shell 101 and the second shell 102 for welding, and after welding, the first shell 101 and the second shell 102 are closed for insulation; when the pressure in the insulation shell 100 exceeds the first preset pressure, the first pressure relief valve 103 and the second pressure relief valve 104 are opened for pressure relief.

[0055] Optionally, the heat generated by welding and the heat required for insulation are calculated separately; on the basis that the heat generated by welding meets the heat required for insulation, if the difference between the heat generated by welding and the heat required for insulation exceeds a preset value, then when the pressure in the insulation shell 100 exceeds a second preset pressure, the first pressure relief valve 103 and the second pressure relief valve 104 are opened to release pressure, and the second preset pressure is less than the first preset pressure. The heat generated by welding is equal to the product of the arc power effective utilization coefficient, the welding current and the arc voltage, and the ratio of the welding speed; the heat required for insulation is equal to the product of the specific heat capacity, the air mass in the insulation shell, and the temperature change.

[0056] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A circumferential weld welding insulation device in wind power equipment processing, characterized in that: comprising at least one thermal insulation shell; The heat-insulating shell comprises a first shell and a second shell connected to each other; a first connecting piece is provided at an end of the first shell away from the second shell, and a second connecting piece is provided at an end of the second shell away from the first shell; a first pressure relief valve is provided on the first shell, and a second pressure relief valve is provided on the second shell; The first shell and the second shell are connected to a welding object through the first connecting member and the second connecting member, respectively; during welding, the first shell and the second shell are separated at the connection, a welding gun is inserted into the connection between the first shell and the second shell for welding, and the first shell and the second shell are closed after welding; When the pressure in the heat-insulating shell exceeds a first preset pressure, the first pressure relief valve and the second pressure relief valve open to relieve pressure.

2. A circumferential weld welding insulation device in wind power equipment processing as claimed in claim 1, characterized in that: The first connecting member and the second connecting member are both configured as electromagnetic devices.

3. A circumferential weld welding insulation device in wind power equipment processing as claimed in claim 1, characterized in that: A guide is provided at the connection between the first shell and the second shell; the guide includes a first electromagnet provided on the first shell and a second electromagnet provided on the second shell.

4. A circumferential weld welding insulation device in wind power equipment processing as claimed in claim 3, characterized in that: The heat generated by welding and the heat required for thermal insulation are calculated separately; on the basis that the heat generated by welding meets the heat demand for thermal insulation, if the difference between the heat generated by welding and the heat required for thermal insulation exceeds a preset value, then when the pressure in the thermal insulation shell exceeds a second preset pressure, the first pressure relief valve and the second pressure relief valve are opened to relieve pressure, and the second preset pressure is less than the first preset pressure.

5. The circumferential weld welding insulation device in wind power equipment processing according to claim 1, characterized in that: The first shell and the second shell both include an inner thermal insulation layer and an outer thermal insulation layer arranged on the inner thermal insulation layer; the inner thermal insulation layer is a flexible metal.

6. A circumferential weld welding insulation device in wind power equipment processing as claimed in claim 1, characterized in that: There are multiple heat-insulating shells, which are connected to the object along circumferential welds, and the sides of adjacent heat-insulating shells are in contact connection.

7. A circumferential weld welding method in wind power equipment processing, characterized in that: The circumferential weld welding insulation device in the processing of wind power equipment as described in any one of claims 1 to 6 is used, comprising: the first shell and the second shell are separated at the connection, a welding gun is inserted into the connection between the first shell and the second shell for welding, and after welding, the first shell and the second shell are closed for insulation; When the pressure in the heat-insulating shell exceeds a first preset pressure, the first pressure relief valve and the second pressure relief valve open to relieve pressure.

8. A circumferential weld welding method in wind power equipment processing as claimed in claim 7, characterized in that: The heat generated by welding and the heat required for thermal insulation are calculated separately; on the basis that the heat generated by welding meets the heat demand for thermal insulation, if the difference between the heat generated by welding and the heat required for thermal insulation exceeds a preset value, then when the pressure in the thermal insulation shell exceeds a second preset pressure, the first pressure relief valve and the second pressure relief valve are opened to relieve pressure, and the second preset pressure is less than the first preset pressure.

9. A circumferential weld welding method in wind power equipment processing as claimed in claim 8, characterized in that: The heat generated by welding is equal to the ratio of the product of the arc power effective utilization coefficient, the welding current and the arc voltage to the welding speed.

10. A circumferential weld welding method in wind power equipment processing as claimed in claim 8, characterized in that: The heat required for the insulation is equal to the product of the specific heat capacity, the air mass in the insulation shell and the temperature change.

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