Helical blade replacement anti-deformation system and method

Abstract

The invention relates to the technical field of transportation mechanical equipment, and provides a spiral blade replacement anti-deformation system and method. The system comprises a horizontal supporting and positioning device used for supporting and horizontally fixing a spiral mandrel from the lower portion in the process of removing old blades and welding new blades; the circulating cooling device is communicated with the interior of the spiral core shaft to form a cooling loop for circularly cooling the spiral core shaft; and the blade fixing device is detachably clamped at the joint of each spiral blade and the blade root and is used for pressing and fixing the joint after the new blade is welded. According to the method, the mandrel of the repaired spiral conveyor is not bent, the spiral line of the blade is smooth and complete, the operation stability and the material conveying efficiency of the repaired spiral conveyor are remarkably improved, and continuous and stable material conveying between vanadium oxide production procedures is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of transportation machinery and equipment technology, and in particular to a system and method for preventing deformation during the replacement of spiral blades. Background Technology

[0002] The effective connection of materials in the multiple production processes of vanadium trioxide, including roasting, leaching, and raw material handling, relies heavily on bucket elevators, belt conveyors, and screw conveyors, with screw conveyors playing a dominant role in the transmission equipment. Due to the process characteristics of vanadium trioxide preparation, the screw blades of the screw conveyor are easily worn by vanadium oxide clinker particles during continuous use. Therefore, replacing the blades and repairing the screw conveyor after it is taken offline is a common practice.

[0003] Currently, the traditional method for replacing spiral mandrel blades involves extracting the mandrel from its casing and placing it directly on the ground. A gas cutting torch or plasma cutting torch is then used to cut away the welded portion at the root of the worn spiral blades at high temperatures. This method of removing worn blades causes the spiral mandrel to bend. Secondly, during the replacement of new spiral blades, the lack of horizontal support for the mandrel, coupled with uneven heating during continuous welding of the new blades, contributes to bending. Thirdly, the lack of clamping and fixing devices at the joints of the spiral blades during welding further contributes to welding deformation. Furthermore, the crude welding methods used in traditional spiral blade replacement further exacerbate the deformation of the mandrel and blades.

[0004] The traditional method of replacing blades in screw conveyors is flawed, resulting in bent spindles and deformed blades. This causes the bent spindle to frequently rub against the screw cylinder, increasing the obstruction of screw operation. Deformed blades after welding can also damage the screw line and rub against the shell, greatly reducing the material conveying effect. When the screw running resistance is too high, it can even lead to the serious problems of screw jamming or spindle breakage.

[0005] In summary, during the process of removing old blades and installing new blades, it is difficult to effectively control the bending degree of the spindle and the deformation of the blades after the replacement of the blades. This results in frequent rubbing of the screw cylinder and a high failure rate in the screw conveyor after repair. The labor intensity of manual intervention for screw failures increases in the later stage. At the same time, the repair of failures reduces the normal conveying capacity of the screw conveyor, which hinders the efficient production of vanadium oxide. Summary of the Invention

[0006] In view of this, and in response to the technical problems in the prior art where the replacement of spiral blades results in bending of the spindle and deformation of the blade welding, leading to a high failure rate and low conveying efficiency of the repaired spiral conveyor, this disclosure provides a spiral blade replacement anti-deformation system and method.

[0007] According to a first aspect of the present invention, a helical blade replacement anti-deformation system is provided, comprising: A horizontal support and positioning device is used to support and horizontally fix the spiral mandrel from below during the process of removing old blades and welding new blades. A circulating cooling device is connected to the interior of the spiral mandrel to form a cooling circuit for circulating cooling of the spiral mandrel; A blade fixing device, which is detachably clamped at the junction of each helical blade and the blade root, and is used to press and fix the junction after welding a new blade; The horizontal support positioning device, the circulating cooling device, and the blade fixing device work together to keep the mandrel bending within the normal range during the process of removing old blades and welding new blades, and to prevent welding deformation at the joints of the spiral blades.

[0008] In some embodiments, the horizontal support positioning device is evenly distributed to support the front, middle and rear of the spiral mandrel.

[0009] In some embodiments, the horizontal support positioning device includes at least three sets of lifting trolleys, each set of lifting trolleys being equipped with a self-locking lifting rocker for adjusting the lifting height, a brake universal wheel for positioning, and a spindle support roller for support.

[0010] In some embodiments, the horizontal support positioning device further includes a correction mandrel and a magnetic level. The correction mandrel is used to pre-place on the mandrel support rollers of each group of lifting trolleys before placing the spiral mandrel to be repaired. The magnetic level is used to calibrate the horizontal state of the correction mandrel and adjust each group of lifting trolleys to the same horizontal height based on the horizontal state of the correction mandrel.

[0011] In some embodiments, the circulating cooling device includes a circulating water tank, a circulating water pump, an inlet water pipeline, a return water pipeline, an inlet water connector, and a return water connector. The inlet water connector and the return water connector are detachably connected to both ends of the spiral mandrel, and the circulating water pump is used to drive the circulating water to circulate between the circulating water tank and the spiral mandrel.

[0012] In some embodiments, the circulating water pump is used to drive circulating water to circulate inside the spiral mandrel in a bottom-in, top-out manner.

[0013] In some embodiments, the blade fixing device includes multiple blade clamps for independently pressing and fixing each of the joints. Each blade clamp is provided with a clamp top block, a top block knob and a fixing nut. The clamp top block cooperates with the fixing nut through the top block knob to adjust the degree of pressing.

[0014] In some embodiments, the blade clamps are symmetrically distributed in the circumferential direction of the spiral mandrel to symmetrically position and fix the spiral blades during the welding process.

[0015] In some embodiments, the diameter of the welding rod used in conjunction with the blade clamp is 2.5 to 3.2 mm, and the welding current is not greater than 100 amperes.

[0016] According to a second aspect of the present invention, a method for preventing deformation during helical blade replacement is provided, using the helical blade replacement deformation prevention system described in any of the preceding claims, comprising: The spiral mandrel is supported from below and horizontally fixed during the process of removing old blades and welding new blades by a horizontal support and positioning device. A cooling circuit is formed by connecting the circulating cooling device to the interior of the spiral mandrel, thereby circulating and cooling the spiral mandrel. The blade fixing device can be detachably clamped at the junction of each helical blade and the blade root, and after the new blade is welded, the junction of each helical blade is pressed and fixed.

[0017] The aforementioned anti-deformation system for replacing spiral blades, through the coordinated operation of a horizontal support positioning device, a circulating cooling device, and a blade fixing device, helps ensure that the bending degree of the spiral mandrel is within the normal range and that the spiral blades are not deformed during welding during the replacement of spiral blades. This results in a straight spiral conveyor mandrel after repair with smooth and complete spiral lines on the blades, significantly improving the operational stability and material conveying efficiency of the screw conveyor after repair, and ensuring continuous and stable material conveying between vanadium oxide production processes. Specifically, the horizontal support positioning device supports and fixes the spiral mandrel horizontally from below, ensuring that the mandrel remains horizontally fixed during the cutting of old blades and welding of new blades, thus helping to keep the mandrel bending degree within the normal range. The circulating cooling device, through a cooling circuit connected to the inside of the spiral mandrel, circulates and cools the mandrel during welding, effectively controlling welding thermal stress and avoiding mandrel deformation caused by localized high temperatures. The blade fixing device, by detachably clamping and pressing the blades together, achieves accurate positioning of the blade joints, ensuring smooth and deformation-free welding.

[0018] In addition, the spiral blade replacement anti-deformation method of this application can also achieve the above-mentioned technical effects, which will not be described in detail here. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a spiral blade replacement anti-deformation system provided in one embodiment of the present invention; Figure 2 A schematic diagram of a lifting trolley provided for another embodiment of the present invention; Figure 3 A schematic diagram of a blade clamp provided for another embodiment of the present invention.

[0021] The attached figures are labeled as follows: 1. Circulating water tank; 2. Circulating water pump; 3. Inlet water pipeline; 4. Return water pipeline; 5. Inlet water connector; 6. Spiral mandrel; 7. Spiral blades; 8. Blade clamp; 9. Correction mandrel; 10. Magnetic level; 11. Self-locking lifting rocker; 12. Braking caster wheel; 13. Lifting trolley assembly; 14. Return water connector; 15. Mandrel support roller; 16. Top block knob; 17. Clamping plate top block; 18. Fixing nut; 801. Horizontal support positioning device; 802. Circulating cooling device; 803. Blade fixing device; 100. Spiral blade replacement anti-deformation system. Detailed Implementation

[0022] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0023] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0024] It should be noted that, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as "including" or "contains" mean that the element preceding the word covers the element listed after the word, and do not exclude the possibility of covering other elements as well.

[0026] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances. When a particular device is described as being located between a first device and a second device, an intermediary device may or may not be present between the particular device and the first or second device.

[0027] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0028] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0029] It should be understood that the embodiments of the invention shown in the exemplary embodiments are merely illustrative. Although only a few embodiments have been described in detail in this invention, those skilled in the art will readily recognize that various modifications are possible without substantially departing from the teachings of the invention. Accordingly, all such modifications should be included within the scope of the invention. Other substitutions, modifications, variations, and deletions can be made to the design, operating conditions, and parameters of the following exemplary embodiments without departing from the spirit of the invention.

[0030] Please refer to Figures 1-3 , Figure 1 The diagram shown is a schematic representation of a spiral blade replacement anti-deformation system according to an embodiment of the present invention. Figure 2 A schematic diagram of the lifting trolley is shown. Figure 3 A schematic diagram of the blade clamp is shown. A spiral blade replacement anti-deformation system 100 includes: a horizontal support positioning device 801, a circulating cooling device 802, and a blade fixing device 803. The horizontal support positioning device 801 is used to support and horizontally fix the spiral mandrel 6 from below during the removal of old blades and welding of new blades; the circulating cooling device 802 is internally connected to the spiral mandrel 6, forming a cooling circuit for circulating cooling of the spiral mandrel 6; the blade fixing device 803 is detachably clamped at the joint between each spiral blade 7 and the blade root, and is used to press and fix the joint after welding new blades. The horizontal support positioning device 801, the circulating cooling device 802, and the blade fixing device 803 work together during the removal of old blades and welding of new blades to keep the mandrel 6's bending degree within the normal range and prevent welding deformation at the joints of the spiral blades 7. The horizontal support and positioning device 801 supports and horizontally fixes the spiral mandrel 6 from below, ensuring that the spiral mandrel 6 remains horizontally fixed during the cutting of old blades and welding of new blades, thus keeping the bending degree of the spiral mandrel within the normal range. The circulating cooling device 802, through a cooling circuit connected to the inside of the spiral mandrel 6, circulates cooling to the spiral mandrel 6 during welding, effectively controlling welding thermal stress and preventing deformation of the spiral mandrel 6 due to localized high temperatures. The blade fixing device 803 detachably clamps and presses the blades together at the joints, ensuring accurate positioning of the blade joints and guaranteeing smooth, deformation-free welding.

[0031] The aforementioned anti-deformation system 100 for replacing spiral blades, through the coordinated operation of the horizontal support positioning device 801, the circulating cooling device 802, and the blade fixing device 803, helps to ensure that the bending degree of the spiral mandrel 6 is within the normal range and that the spiral blade 7 is not deformed during welding during the replacement of the spiral blade 7. After repair, the spiral conveyor mandrel is not bent and the spiral line of the blade is smooth and complete, which significantly improves the operational stability and material conveying efficiency of the spiral conveyor after repair, and ensures the continuous and stable material conveying between vanadium oxide production processes.

[0032] According to several embodiments of the present invention, the horizontal support positioning device 801 provides even support at the front, middle and rear of the spiral mandrel 6, so that the spiral mandrel 6 remains in a fixed horizontal state during the cutting process of removing old blades and the welding process of new blades.

[0033] According to several embodiments of the present invention, the horizontal support positioning device 801 includes at least three sets of lifting trolley groups 13. Each set of lifting trolley groups 13 is equipped with a self-locking lifting rocker 11, a brake universal wheel 12, and a mandrel support roller 15 for supporting the spiral mandrel 6. The self-locking lifting rocker 11 is used to adjust the support height of each set of lifting trolley groups 13, and the brake universal wheel 12 is used to position the lifting trolley group 13 after horizontal adjustment. The lifting trolley groups 13 support the spiral mandrel 6 from below. The self-locking lifting rocker 11 adjusts the support height of each set of lifting trolley groups 13 to achieve precise adjustment of the horizontality of the spiral mandrel 6. The brake universal wheel 12 locks the lifting trolley group 13 in position after horizontal adjustment to prevent displacement during subsequent cutting and welding. The mandrel support roller 15 contacts the outer surface of the spiral mandrel 6, providing support while allowing the spiral mandrel 6 to rotate slightly during cutting, facilitating the operator to remove old blades evenly. In one specific embodiment, the horizontal support positioning device 801 includes three sets of lifting trolleys 13, which are respectively supported at the front, middle and rear of the spiral mandrel 6 to form a three-point uniform support structure. During the cutting process of removing old blades and the welding process of new blades, the spiral mandrel 6 is kept in a fixed horizontal state, which effectively avoids the bending deformation of the mandrel caused by uneven distribution of support points.

[0034] According to several embodiments of the present invention, the horizontal support positioning device 801 further includes a calibration mandrel 9 and a magnetic level 10. The calibration mandrel 9 is used to pre-place on the mandrel support rollers 15 of each group of lifting trolleys 13 before placing the spiral mandrel 6 to be repaired. The magnetic level 10 is used to calibrate the horizontal state of the calibration mandrel 9 and adjust each group of lifting trolleys 13 to the same horizontal height based on the horizontal state of the calibration mandrel 9. In some embodiments, the calibration mandrel 9 is a metal optical shaft of standard diameter, whose straightness and surface accuracy have been pre-checked. It is used to place on the mandrel support rollers 15 of each group of lifting trolleys 13 before placing the spiral mandrel 6 to be repaired, as a reference for horizontal calibration. The magnetic level 10 is attached to the surface of the calibration mandrel 9. The operator observes the position of the bubble on the level and adjusts the self-locking lifting levers 11 of at least three sets of lifting trolley groups 13 (e.g., three sets in one specific embodiment) until the calibration mandrel 9 is horizontal in both the front and rear directions. At this point, the brake casters 12 are locked to position the lifting trolley groups 13. After calibration, the calibration mandrel 9 is removed, and the spiral mandrel 6 to be repaired is then hoisted and placed on the same set of mandrel support rollers 15. The spiral mandrel 6 is now in a preset horizontal fixed state. This method of calibration before placement ensures the consistency of the support benchmark before each repair operation and avoids additional deformation caused by unevenness in the support device itself.

[0035] According to several embodiments of the present invention, the circulating cooling device 802 includes a circulating water tank 1, a circulating water pump 2, an inlet water pipeline 3, a return water pipeline 4, an inlet water connector 5, and a return water connector 14. The inlet water connector 5 and the return water connector 14 are detachably connected to both ends of the spiral mandrel 6, respectively. The circulating water pump 2 is used to drive the circulating water to circulate between the circulating water tank 1 and the spiral mandrel 6. The circulating water pump 2 is a low-pressure, low-flow circulating pump. The circulating water pump 2 is used to drive the circulating water to circulate inside the spiral mandrel 6 in a bottom-in, top-out manner, so as to reduce the stress deformation of the spiral mandrel 6 caused by welding heat during the welding of new blades.

[0036] Specifically, the circulating water tank 1 stores the cooling medium, and the circulating water pump 2 is a low-pressure, low-flow circulating pump, with an output pressure typically not exceeding 0.3 MPa and a flow rate in the range of 5-15 liters per minute. This is to meet the slow heat dissipation requirements of the heat input during welding and to avoid new thermal stress on the mandrel due to excessively rapid cooling. The inlet connector 5 and the outlet connector 14 are detachably connected to both ends of the spiral mandrel 6, forming a closed cooling circuit. The circulating water pump 2 drives the cooling water to circulate between the circulating water tank 1 and the spiral mandrel 6 in a bottom-in, top-out manner. That is, the cooling water enters from the lower end of the spiral mandrel 6 and flows out from the higher end, ensuring that the cooling water can fill the entire internal cavity of the spiral mandrel 6 and achieve uniform heat exchange. During the welding process, the cooling water continuously removes the heat transferred from the spiral mandrel 6 due to welding, keeping the body temperature of the spiral mandrel 6 within a safe range and effectively avoiding stress deformation of the spiral mandrel 6 caused by the accumulation of local high temperatures.

[0037] According to several embodiments of the present invention, the blade fixing device 803 includes a plurality of blade clamping plates 8. Each blade clamping plate 8 is provided with a clamping plate top block 17, a top block knob 16, and a fixing nut 18. The clamping plate top block 17 cooperates with the fixing nut 18 through the top block knob 16 to adjust the degree of clamping. Each blade clamping plate 8 is used to independently clamp and fix the joint of each helical blade 7. In some embodiments, each blade clamping plate 8 has a semi-circular or arc-shaped structure, and its inner diameter matches the outer diameter of the helical mandrel 6. It is used to straddle the helical mandrel 6 and cover the blade joint. Each blade clamping plate 8 is provided with a clamping plate top block 17, a top block knob 16, and a fixing nut 18. The clamping plate top block 17 is located on the inner side of the blade clamping plate 8 and is used to directly press against the joint of the helical blade 7. The top block knob 16 passes through the blade clamping plate 8 and is connected to the clamping plate top block 17. By rotating the top block knob 16, the clamping plate top block 17 can be pushed to move in the direction of the blade. The fixing nut 18 is used to lock the adjusted position. Each blade clamp 8 is used to independently press and fix the joint of each spiral blade 7. The operator can adjust the clamping force according to the actual gap of each spiral blade 7 joint to ensure that all spiral blades 7 are reliably fixed before welding, and prevent the spiral blades 7 from being misaligned and welded due to welding heat stress or operational disturbance during the welding process.

[0038] According to several embodiments of the present invention, the blade clamps 8 are symmetrically distributed circumferentially on the helical mandrel 6 to symmetrically position and fix the helical blades 7 during welding. Specifically, after multiple helical blades 7 are sequentially butted together on the helical mandrel 6, a blade clamp 8 is installed at the joint of each helical blade 7, and the clamping top block 17 of each blade clamp 8 applies a clamping force to the blade joint from different angles in the circumferential direction. The symmetrically arranged clamping points make the fixing of the helical blades 7 more stable before welding, and at the same time provide a structural basis for the subsequent use of symmetrical welding process. The symmetrical distribution of the blade clamps 8 in the circumferential direction, combined with the subsequent welding of each new blade in circumferential segments and in a symmetrical order, jointly offsets the tendency of blade deformation caused by unilateral welding stress.

[0039] According to several embodiments of the present invention, the diameter of the welding rod used in conjunction with the blade clamp 8 is 2.5~3.2 mm, and the welding current is not greater than 100 amperes.

[0040] As a specific embodiment, the welding process parameters for the blade clamping plate 8 are as follows: small-diameter welding rods with a diameter of 2.5~3.2 mm are used; the welding current is no more than 100 amperes; and short-arc welding and narrow-bead welding are employed. Small-diameter welding rods and low current help reduce the heat input of a single weld, while short-arc welding and narrow-bead welding concentrate the weld seam and reduce the heat-affected zone, avoiding localized overheating deformation caused by prolonged continuous welding. In actual operation, the operator divides the circumference of each new blade into four segments, welding the first segment first, then the symmetrical third segment, then the second segment, and finally the symmetrical fourth segment, i.e., welding symmetrically in the order of first, third, second, and fourth. This segmented symmetrical welding method allows the welding stress generated by each segment of the weld seam in the circumferential direction of the spiral blade 7 to cancel each other out, effectively preventing warping deformation of the spiral blade 7 caused by unilateral welding stress.

[0041] According to a second aspect of the present invention, a method for preventing deformation during helical blade replacement is provided, using the helical blade replacement deformation prevention system 100 of any of the preceding claims, comprising: supporting and horizontally fixing a helical mandrel 6 from below during the removal of old blades and welding of new blades using a horizontal support positioning device 801; forming a cooling circuit for circulating cooling of the helical mandrel 6 by communicating with the interior of a circulating cooling device 802; and detachably clamping each helical blade 7 at the joint with the blade root using a blade fixing device 803, and pressing and fixing the joint of each helical blade 7 after welding of new blades. During the removal of old blades and welding of new blades, the combined action of the horizontal support positioning device 801, the circulating cooling device 802, and the blade fixing device 803 maintains the mandrel curvature of the helical mandrel 6 within a normal range and prevents welding deformation at the joint of each helical blade 7.

[0042] In one specific implementation, the method is carried out using the spiral blade replacement anti-deformation system described in any of the above embodiments.

[0043] Specifically, firstly, the horizontal support positioning device 801 supports and horizontally fixes the spiral mandrel 6 from below, ensuring a stable horizontal posture throughout the cutting of old blades and welding of new blades. Simultaneously, a circulating cooling device 802, connected to the interior of the spiral mandrel 6, forms a cooling circuit for continuous cooling. Cooling water is continuously supplied during welding to dissipate welding heat and prevent thermal stress deformation caused by localized high temperatures. Then, the blade fixing device 803 detachably clamps the joints of each spiral blade 7, pressing and fixing them to ensure accurate positioning of the spiral blades 7 before welding and preventing misalignment and deformation during the welding process. Throughout the process of removing old blades and welding new blades, the combined action of the horizontal support positioning device 801, the circulating cooling device 802, and the blade fixing device 803 maintains the mandrel curvature of the spiral mandrel 6 within a normal range and prevents welding deformation at the joints of the spiral blades 7, thus achieving a straight mandrel without bending and a smooth, complete spiral line after the replacement of the spiral blades 7.

[0044] For example, in one specific operation, the operator first places the calibration mandrel 9 on the mandrel support rollers 15 of the three sets of lifting trolleys 13, attaches the magnetic level 10, and adjusts the height of each set of lifting trolleys 13 using the self-locking lifting rocker 11 until the calibration mandrel 9 is horizontal. The brake caster 12 is then locked to complete the benchmark calibration. After removing the calibration mandrel 9, the spiral mandrel 6 to be repaired is hoisted and placed on the same set of mandrel support rollers 15, at which point the spiral mandrel 6 is in a horizontal and fixed state. Subsequently, the inlet connector 5 and return connector 14 are installed to both ends of the spiral mandrel 6, the inlet and return water lines are connected, and the low-pressure, low-flow circulating water pump 2 is started, allowing the cooling water to circulate slowly between the circulating water tank 1 and the spiral mandrel 6 in a bottom-in, top-out manner. The operator uses a cutting machine to cut off the worn blades one by one along the joint between the root of the old blade and the spiral mandrel 6, and grinds away the weld scars on the surface of the spiral mandrel 6, exposing a clean, smooth shaft surface. Next, multiple new spiral blades 7 are sequentially aligned and arranged on the spiral mandrel 6. A blade clamping plate 8 is installed at the joint of each spiral blade 7. The clamping force of the clamping plate top block 17 is adjusted using the top block knob 16 and fixing nut 18 to independently clamp and fix each spiral blade 7 joint. Finally, using welding rods with a diameter of 2.5~3.2 mm and a welding current not exceeding 100 amperes, each new spiral blade 7 is divided into four circumferential segments and welded symmetrically in the order of segments one, three, two, and four. During the welding process, the circulating cooling device 802 runs continuously to ensure uniform temperature of the spiral mandrel 6. After welding, the spiral mandrel 6 is allowed to cool naturally to room temperature before the blade clamping plate 8 and circulation pipeline are removed, completing the replacement of the entire spiral blade 7. The spiral mandrel repaired using this system and method exhibits minimal bending deformation, the new blade spiral remains smooth and intact, and there is no rubbing against the casing after operation. The conveying capacity is comparable to that of a new spiral, effectively solving the frequent failures caused by mandrel bending and blade deformation in traditional repair methods.

[0045] The aforementioned anti-deformation system 100 for replacing spiral blades, through the coordinated operation of the horizontal support positioning device 801, the circulating cooling device 802, and the blade fixing device 803, helps to ensure that the bending degree of the spiral mandrel 6 is within the normal range and that the spiral blade 7 is not deformed during welding during the replacement of the spiral blade 7. After repair, the spiral conveyor mandrel is not bent and the spiral line of the blade is smooth and complete, which significantly improves the operational stability and material conveying efficiency of the spiral conveyor after repair, and ensures the continuous and stable material conveying between vanadium oxide production processes.

[0046] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0047] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any manner.

Claims

1. A spiral blade replacement and deformation prevention system, characterized in that, include: A horizontal support positioning device (801) is used to support and horizontally fix the helical mandrel (6) from below during the process of removing old blades and welding new blades. A circulating cooling device (802) is connected to the interior of the spiral mandrel (6) to form a cooling circuit for circulating cooling of the spiral mandrel (6); The blade fixing device (803) is detachably clamped at the junction of each helical blade (7) and the blade root, and is used to press and fix the junction after welding a new blade.

2. The spiral blade replacement anti-deformation system according to claim 1, characterized in that, The horizontal support positioning device (801) provides even support at the front, middle and rear of the spiral mandrel (6).

3. The spiral blade replacement anti-deformation system according to claim 1, characterized in that, The horizontal support positioning device (801) includes at least three sets of lifting trolleys (13), each set of lifting trolleys (13) is equipped with a self-locking lifting rocker (11) for adjusting the lifting height, a brake universal wheel (12) for positioning, and a spindle support roller (15) for support.

4. The spiral blade replacement anti-deformation system according to claim 3, characterized in that, The horizontal support positioning device (801) further includes a correction mandrel (9) and a magnetic level (10). The correction mandrel (9) is used to pre-place the spiral mandrel (6) to be repaired on the mandrel support roller (15) of each group of lifting trolleys (13) before placing it. The magnetic level (10) is used to correct the horizontal state of the correction mandrel (9) and adjust each group of lifting trolleys (13) to the same horizontal height based on the horizontal state of the correction mandrel (9).

5. The spiral blade replacement anti-deformation system according to claim 1, characterized in that, The circulating cooling device (802) includes a circulating water tank (1), a circulating water pump (2), an inlet water pipeline (3), a return water pipeline (4), an inlet water connector (5), and a return water connector (14). The inlet water connector (5) and the return water connector (14) are detachably connected to both ends of the spiral mandrel (6). The circulating water pump (2) is used to drive the circulating water to circulate between the circulating water tank (1) and the spiral mandrel (6).

6. The anti-deformation system for replacing spiral blades according to claim 1, characterized in that, The circulating water pump (2) is used to drive the circulating water to circulate inside the spiral mandrel (6) in a bottom-in, top-out manner.

7. The anti-deformation system for replacing spiral blades according to claim 1, characterized in that, The blade fixing device (803) includes multiple blade clamps (8) for independently pressing and fixing each of the joints. Each blade clamp (8) is provided with a clamp top block (17), a top block knob (16) and a fixing nut (18). The clamp top block (17) cooperates with the fixing nut (18) through the top block knob (16) to adjust the degree of pressing.

8. A spiral blade replacement anti-deformation system according to claim 7, characterized in that, Each of the blade clamps (8) is symmetrically distributed in the circumferential direction of the spiral mandrel (6) so as to symmetrically position and fix each of the spiral blades (7) during the welding process.

9. A spiral blade replacement anti-deformation system according to claim 7, characterized in that, The diameter of the welding rod used with the blade clamp (8) is 2.5~3.2 mm, and the welding current is not greater than 100 amperes.

10. A method for preventing deformation during the replacement of helical blades, characterized in that, Using the helical blade replacement anti-deformation system according to any one of claims 1-9, comprising: The spiral mandrel (6) is supported from below and horizontally fixed during the process of removing old blades and welding new blades by means of a horizontal support positioning device (801). The circulating cooling device (802) is connected to the interior of the spiral mandrel (6) to form a cooling circuit for circulating cooling of the spiral mandrel (6); The blade fixing device (803) is detachably clamped at the junction of each helical blade (7) and the blade root, and the junction of each helical blade (7) is pressed and fixed after the new blade is welded.

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