A mounting device and installation method for the lower spiral shaft of a vertical spiral mixer mill.

Abstract

This invention provides an installation device and method for the lower spiral shaft of a vertical spiral stirred mill, belonging to the field of metallurgical equipment installation technology. The installation device for the lower spiral shaft of the vertical spiral stirred mill includes a hoisting device and a lifting and tensioning system. The hoisting device includes a lower spiral shaft fixing part, a first lifting lug, and a lifting cable, with one end of the lifting cable connected to the first lifting lug. The lower spiral shaft fixing part can be connected to the upper end face of the lower spiral shaft. The lifting and tensioning system includes a tensioning mechanism, a lifting ring, and a lifting mechanism. One end of the tensioning mechanism is connected to the cylinder body, and the other end is connected to the lifting ring. The lifting mechanism can be located at the bottom of the cylinder body. The lifting ring can be fitted onto the neck of the lower spiral shaft. This invention enables hoisting from outside the cylinder body, greatly reducing installation difficulty, labor intensity, and installation efficiency, while lowering construction costs. After installation, the equipment operates smoothly and can grind particles that meet the process requirements.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical equipment installation technology, and particularly relates to a mounting device and method for the lower spiral shaft of a vertical spiral stirring mill. Background Technology

[0002] The vertical spiral stirred mill was invented in the 1950s, initially used primarily for grinding non-metallic minerals. Its grinding process involves a top motor driving a connected reduction gear mechanism, which in turn drives the spiral stirring mechanism inside the mill. Utilizing the stirring device to move the grinding media generates impact, shearing, and grinding effects, thus pulverizing the material, a method significantly different from the cascading impact grinding of traditional ball mills. The vertical spiral stirred mill mainly consists of a mill body assembly, bearing supports, a reduction gear support, a lower spiral shaft assembly, an upper shaft assembly, a reduction gear assembly, and a main motor. Due to its energy-saving and high-efficiency characteristics, it began to be used for grinding non-ferrous metal ores in the mid-to-late 1980s.

[0003] Because vertical spiral mixer mills are used in the metallurgical field, they are characterized by their large size, heavy weight, and high installation technical requirements, making construction particularly difficult. The installation of the lower spiral shaft assembly is especially challenging; its irregular shape, large size, and heavy weight mean that hoisting operations can only be carried out within the confined space of the mill after other components have been adjusted. Conventional lifting equipment alone cannot operate within this narrow confines, further complicating the installation process. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a lower spiral shaft installation device for a vertical spiral stirring mill. The vertical spiral stirring mill includes a cylinder, bearing support, reducer bracket, lower spiral shaft, upper shaft, reducer and main motor. The installation device includes: a hoisting device and a lifting and tensioning system.

[0005] The hoisting device includes a lower spiral shaft fixing part, a first lifting lug, and a sling, one end of which is connected to the first lifting lug; the lower spiral shaft fixing part can be connected to the upper end face of the lower spiral shaft;

[0006] The lifting and tensioning system includes a tensioning mechanism, a lifting ring, and a lifting mechanism. One end of the tensioning mechanism is connected to the cylinder, and the other end of the tensioning mechanism is connected to the lifting ring. The lifting mechanism can be located at the bottom of the cylinder. The lifting ring can be fitted onto the neck of the lower spiral shaft.

[0007] Preferably, the lower spiral shaft fixing part is a disc, the shape of which is the same as the shape and size of the upper end face of the lower spiral shaft.

[0008] Preferably, both the disc and the first lifting lug are made of steel plate.

[0009] Preferably, the first lifting lug comprises four pieces, which are symmetrically and evenly welded to the top surface of the disc, and the lifting sling comprises two sets of steel wire ropes, which are attached to the four first lifting lugs.

[0010] Preferably, the disk has a plurality of first holes, and the top end of the lower spiral shaft has a plurality of second holes, the first holes corresponding to the second holes, and the top ends of the disk and the lower spiral shaft are fixedly connected by a fixing member passing through the first holes and the second holes.

[0011] Preferably, the first hole and the second hole are round holes, and the fastener is a bolt.

[0012] Preferably, the tensioning mechanism includes a plurality of third lifting lugs and a hand chain hoist. The third lifting lugs are disposed at the top of the cylinder body, and the hand chain hoist is connected to the third lifting lugs. The number of third lifting lugs is the same as the number of lifting rings.

[0013] Preferably, the third lifting lug is made of steel plate.

[0014] Preferably, there are six third lifting lugs, which are welded to the top of the cylinder.

[0015] Preferably, the lifting ring is a conical clamp-type lifting ring.

[0016] Preferably, the conical clamp-type lifting ring includes two half-rings, multiple connecting plates, and multiple second lifting lugs, wherein the number of second lifting lugs is the same as that of the third lifting lugs, and the connecting plates are fixedly connected to the connection points of the two half-rings.

[0017] Preferably, the semi-ring, the connecting plate, and the second lifting lug are all made of steel plate.

[0018] Preferably, there are 4 connecting plates and 6 second lifting lugs, and the 4 connecting plates are symmetrically welded at the connection point of the two semi-rings.

[0019] Preferably, the lifting mechanism is a split-type hydraulic jack.

[0020] This invention provides a method for installing the lower spiral shaft of a vertical spiral stirred mill, using the aforementioned installation device for the lower spiral shaft of a vertical spiral stirred mill, comprising the following steps:

[0021] Step 1: Install the hoisting device onto the upper end face of the lower auger shaft;

[0022] Step 2: Fit the lifting ring onto the neck of the lower screw shaft;

[0023] Step 3: Set up the tensioning mechanism by connecting one end of the tensioning mechanism to the top of the cylinder and the other end to the lifting ring.

[0024] Step 4: Install a lifting mechanism at the bottom of the cylinder;

[0025] Step 5: Use lifting equipment to lift the lower auger shaft;

[0026] Step 6: Suspend the lower spiral shaft onto the lifting mechanism inside the cylinder;

[0027] Step 7: Dismantle the hoisting equipment;

[0028] Step 8: Connect the lower spiral shaft to the upper shaft, and remove the lifting mechanism and tensioning mechanism.

[0029] Preferably, the lower spiral shaft fixing part is a disc with multiple first holes on the disc, and the top of the lower spiral shaft includes multiple second holes, with the first holes corresponding to the second holes. The tensioning mechanism includes multiple third lifting lugs and a hand chain hoist. The lifting ring is a conical clamp-type lifting ring, which includes two half-rings, multiple connecting plates, and multiple second lifting lugs. The number of second lifting lugs is the same as the number of third lifting lugs. The connecting plates are fixedly connected to the connection points of the two half-rings.

[0030] Preferably, the specific steps include:

[0031] Step S1: After the cylinder is installed and adjusted, bolts are used to pass through the first and second holes to install the disc-shaped hoisting device onto the upper end face of the lower spiral shaft.

[0032] Step S2: Install the conical clamp-type lifting ring onto the neck of the lower spiral shaft;

[0033] Step S3: The third lifting lug of the tensioning mechanism is symmetrically and evenly welded to the top of the cylinder body. Then, one end of the hook of the hand chain hoist is tied to the third lifting lug, and the other end of the hook of the hand chain hoist is temporarily suspended.

[0034] Step S4: Set the lifting mechanism at the bottom of the cylinder body;

[0035] Step S5: Hang the crane hook on the disc, lift the lower spiral shaft to directly above the cylinder, and let it fall into the cylinder until the top surface of the lower spiral shaft is lower than the preset height of the upper end surface of the cylinder and then stop descending.

[0036] Step S6: Attach the hook at the other end of the hand chain hoist of the tensioning mechanism to the second lifting lug on the conical clamp-type lifting ring, operate the hand chain of the hand chain hoist to tighten it, and at the same time move the lifting mechanism to directly below the lower spiral shaft so that it lifts the lower spiral shaft to a preset height.

[0037] Step S7: After confirming that the lower spiral shaft is stable inside the cylinder, remove the crane hook and dismantle the lifting device, and begin installing the main motor, reducer and upper shaft;

[0038] Step S8: After the motor, reducer, and upper shaft are installed, rotate the main shaft of the motor to match the installation direction of the upper shaft with that of the lower spiral shaft. Operate the lifting mechanism to lift the lower spiral shaft while simultaneously tightening the tensioning mechanism. After the upper shaft and the lower spiral shaft are in contact, insert and tighten the connecting bolts. After the bolts are tightened, loosen the tensioning mechanism and the lifting mechanism, and remove the conical clamp-type lifting ring to complete the installation of the lower spiral shaft.

[0039] Compared with the prior art, the present invention has at least the following beneficial effects:

[0040] The vertical spiral stirring mill lower spiral shaft installation device of the present invention uses conventional lifting equipment to carry out the hoisting operation outside the cylinder by utilizing a hoisting device and a jacking and tensioning system, which greatly reduces the difficulty of the installation operation, optimizes the installation process of the lower spiral shaft, ensures that the installation quality meets relevant requirements, reduces labor intensity, improves installation efficiency, reduces construction costs, and ensures that the equipment operates stably after installation and can grind particles that meet the process requirements. Attached Figure Description

[0041] Figure 1 This is a flowchart illustrating the installation method of the lower spiral shaft of a vertical spiral stirring mill according to an embodiment of the present invention;

[0042] Figure 2 This is a flowchart of the installation method of the lower spiral shaft of a vertical spiral stirring mill according to another embodiment of the present invention;

[0043] Figure 3 This is a schematic cross-sectional view of a vertical spiral stirring mill according to an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of the lower spiral shaft being suspended into the cylinder according to an embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram showing the connection of the upper and lower shafts according to an embodiment of the present invention.

[0046] Figure 6 This is a top view of a hoisting device according to an embodiment of the present invention;

[0047] Figure 7 This is a top view of a tapered clamp-type lifting ring according to an embodiment of the present invention;

[0048] In the diagram: 1-Lower spiral shaft; 2-Cylinder; 3-Lifting device; 301-Disc; 302-First lifting lug; 303-Lifting sling; 4-Piercing and tensioning system; 401-Tensioning mechanism; 4011-Third lifting lug; 4012-Hand chain hoist; 402-Conical clamp-type lifting ring; 4021-Half ring; 4022-Connecting plate; 4023-Second lifting lug; 403-Piercing mechanism; 5-Crane hook; 6-Upper shaft; 7-Main motor; 8-Reducer; 9-Reducer bracket; 10-Bearing support; 11-Foundation. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0051] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0052] To better understand the purpose, structure, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings.

[0053] The present invention provides a lower spiral shaft installation device for a vertical spiral stirring mill. The vertical spiral stirring mill includes a cylinder 2, a bearing support 10, a reducer bracket 9, a lower spiral shaft 1, an upper shaft 6, a reducer 8, and a main motor 7. The installation device includes a hoisting device 3 and a lifting and tensioning system 4.

[0054] The hoisting device 3 includes a lower spiral shaft fixing part, a first lifting lug 302 and a sling 303, one end of the sling 303 being connected to the first lifting lug 302; the lower spiral shaft fixing part can be connected to the upper end face of the lower spiral shaft 1;

[0055] The lifting and tensioning system 4 includes a tensioning mechanism 401, a lifting ring, and a lifting mechanism 403. One end of the tensioning mechanism 401 is connected to the cylinder 2, and the other end of the tensioning mechanism 401 is connected to the lifting ring. The lifting mechanism 403 can be located at the bottom inside the cylinder 2. The lifting ring can be fitted onto the neck of the lower spiral shaft 1.

[0056] According to a specific embodiment of the present invention, the lower spiral shaft fixing part is a disk 301, the shape of which is the same as the shape and size of the upper end face of the lower spiral shaft 1.

[0057] According to a specific embodiment of the present invention, both the disc 301 and the first lifting lug 302 are made of steel plate.

[0058] According to a specific embodiment of the present invention, the first lifting lug 302 comprises four pieces, which are symmetrically and evenly welded to the top surface of the disc 301, and the lifting cable 303 comprises two sets of steel wire ropes, which are attached to the four first lifting lugs 302.

[0059] According to a specific embodiment of the present invention, a plurality of first holes are provided on the disk 301, and the top end of the lower spiral shaft 1 includes a plurality of second holes, the first holes corresponding to the second holes, and the top ends of the disk 301 and the lower spiral shaft 1 are fixedly connected by a fixing member passing through the first holes and the second holes.

[0060] According to a specific embodiment of the present invention, the first hole and the second hole are circular holes, and the fixing member is a bolt.

[0061] According to a specific embodiment of the present invention, the tensioning mechanism 401 includes a plurality of third lifting lugs 4011 and the hand chain hoist 4012. The third lifting lugs 4011 are disposed at the top end inside the cylinder 2. The hand chain hoist 4012 is connected to the third lifting lugs 4011. The number of third lifting lugs 4011 is the same as the number of lifting rings.

[0062] According to one specific embodiment of the present invention, the third lifting lug 4011 is made of steel plate.

[0063] According to a specific embodiment of the present invention, there are six third lifting lugs 4011, which are welded to the top of the cylinder 2.

[0064] According to a specific embodiment of the present invention, the lifting ring is a conical clamp-type lifting ring 402.

[0065] According to a specific embodiment of the present invention, the conical clamp-type lifting ring 402 includes two half-rings 4021, a plurality of connecting plates 4022 and a plurality of second lifting lugs 4023, wherein the number of second lifting lugs 4023 is the same as that of the third lifting lugs 4011, and the connecting plates 4022 are fixedly connected to the connection points of the two half-rings 4021.

[0066] According to a specific embodiment of the present invention, the semi-ring 4021, the connecting plate 4022, and the second lifting lug 4023 are all made of steel plate.

[0067] According to a specific embodiment of the present invention, there are four connecting plates 4022 and six second lifting lugs 4023. The four connecting plates 4022 are symmetrically welded at the connection point of the two semi-rings 4021.

[0068] According to a specific embodiment of the present invention, the lifting mechanism is a split-type hydraulic jack.

[0069] This invention provides a method for installing the lower spiral shaft of a vertical spiral stirred mill, using the aforementioned installation device for the lower spiral shaft of a vertical spiral stirred mill, comprising the following steps:

[0070] Step 1: Install the hoisting device 3 onto the upper end face of the lower spiral shaft 1;

[0071] Step 2: Fit the lifting ring onto the neck of the lower spiral shaft 1;

[0072] Step 3: Set up the tensioning mechanism 401, connect one end of the tensioning mechanism 401 to the top of the inner cylinder 2, and connect the other end of the tensioning mechanism 401 to the lifting ring;

[0073] Step 4: Install a lifting mechanism 403 at the bottom inside the cylinder 2;

[0074] Step 5: Use lifting equipment to lift the lower screw shaft 1;

[0075] Step 6: Suspend the lower spiral shaft 1 onto the lifting mechanism 403 inside the cylinder 2;

[0076] Step 7, dismantle hoisting device 3;

[0077] Step 8: Connect the lower spiral shaft 1 to the upper shaft 6, and remove the lifting mechanism 403 and the tensioning mechanism 401.

[0078] According to a specific embodiment of the present invention, the lower spiral shaft fixing part is a disc 301, on which a plurality of first holes are provided. The top end of the lower spiral shaft 1 includes a plurality of second holes, the first holes corresponding to the second holes. The tensioning mechanism 401 includes a plurality of third lifting lugs 4011 and the hand chain hoist 4012. The lifting ring is a conical clamp-type lifting ring 402, which includes two half-rings 4021, a plurality of connecting plates 4022, and a plurality of second lifting lugs 4023. The number of second lifting lugs 4023 is the same as that of the third lifting lugs 4011. The connecting plates 4022 are fixedly connected to the connection points of the two half-rings 4021.

[0079] According to a specific embodiment of the present invention, the method includes the following steps:

[0080] Step S1: After the cylinder 2 is installed and adjusted, bolts are used to pass through the first hole and the second hole to install the disc-shaped hoisting device 3 onto the upper end face of the lower spiral shaft 1;

[0081] Step S2: Install the conical clamp-type lifting ring 402 onto the neck of the lower spiral shaft 1;

[0082] Step S3: The third lifting lug 4011 of the tensioning mechanism 401 is symmetrically and evenly welded to the top of the cylinder 2. Then, one end of the hook of the hand chain hoist 4012 is tied to the third lifting lug 4011, and the other end of the hook of the hand chain hoist 4012 is temporarily suspended.

[0083] Step S4: The lifting mechanism 403 is installed at the bottom of the cylinder 2;

[0084] Step S5: Hang the crane hook on the disc 301, lift the lower spiral shaft 1 to directly above the cylinder 2, and let it fall into the cylinder 2 until the top surface of the lower spiral shaft 1 is lower than the preset height of the upper end surface of the cylinder 2 and then stop descending.

[0085] Step S6: Attach the hook at the other end of the hand chain hoist 4012 of the tensioning mechanism 401 to the second lifting lug 4023 on the conical clamp-type lifting ring, operate the hand chain of the hand chain hoist 4012 to tighten it, and at the same time move the lifting mechanism 403 to directly below the lower spiral shaft 1 so that it lifts the lower spiral shaft 1 to a preset height;

[0086] Step S7: After confirming that the lower spiral shaft 1 is stable inside the cylinder 2, remove the crane hook 5 and dismantle the lifting device 3, and begin installing the main motor, reducer 8 and upper shaft 6.

[0087] Step S8: After the motor, reducer 8 and upper shaft 6 are installed, rotate the main shaft of the motor so that the upper shaft 6 matches the installation direction of the lower spiral shaft 1. Operate the lifting mechanism 403 to lift the lower spiral shaft 1, and at the same time tighten the tensioning mechanism 401. After the upper shaft 6 and the lower spiral shaft 1 are in contact, insert the connecting bolt and tighten it. After the bolt is tightened, loosen the tensioning mechanism 401 and the lifting mechanism 403, and remove the conical clamp lifting ring 402 to complete the installation of the lower spiral shaft 1.

[0088] Example 1

[0089] As shown in the figure, the present invention provides a lower spiral shaft installation device for a vertical spiral stirring mill. The vertical spiral stirring mill includes a cylinder 2, a bearing support 10, a reducer bracket 9, a lower spiral shaft 1, an upper shaft 6, a reducer 8, and a main motor 7. The installation device includes a hoisting device 3 and a lifting and tensioning system 4.

[0090] The hoisting device 3 includes a lower spiral shaft fixing part, a first lifting lug 302 and a sling 303, one end of the sling 303 being connected to the first lifting lug 302; the lower spiral shaft fixing part can be connected to the upper end face of the lower spiral shaft 1;

[0091] The lifting and tensioning system 4 includes a tensioning mechanism 401, a lifting ring, and a lifting mechanism 403. One end of the tensioning mechanism 401 is connected to the cylinder 2, and the other end of the tensioning mechanism 401 is connected to the lifting ring. The lifting mechanism 403 can be located at the bottom inside the cylinder 2. The lifting ring can be fitted onto the neck of the lower spiral shaft 1.

[0092] Example 2

[0093] like Figure 3-7 As shown, the present invention provides a lower spiral shaft installation device for a vertical spiral stirring mill. The vertical spiral stirring mill includes a cylinder 2, a bearing support 10, a reducer bracket 9, a lower spiral shaft 1, an upper shaft 6, a reducer 8, and a main motor 7. The installation device includes a hoisting device 3 and a lifting and tensioning system 4.

[0094] The hoisting device 3 includes a lower spiral shaft fixing part, a first lifting lug 302 and a sling 303, one end of the sling 303 being connected to the first lifting lug 302; the lower spiral shaft fixing part can be connected to the upper end face of the lower spiral shaft 1;

[0095] The lifting and tensioning system 4 includes a tensioning mechanism 401, a lifting ring, and a lifting mechanism 403. One end of the tensioning mechanism 401 is connected to the cylinder 2, and the other end of the tensioning mechanism 401 is connected to the lifting ring. The lifting mechanism 403 can be located at the bottom inside the cylinder 2. The lifting ring can be fitted onto the neck of the lower spiral shaft 1.

[0096] Furthermore, in this embodiment, the lower spiral shaft fixing part is a disc 301, the shape of which is the same as the shape and size of the upper end face of the lower spiral shaft 1, and both the disc 301 and the first lifting lug 302 are made of steel plate.

[0097] Furthermore, the first lifting lug 302 comprises four pieces, which are symmetrically and evenly welded to the top surface of the disc 301, and the lifting cable 303 comprises two sets of steel wire ropes, which are attached to the four first lifting lugs 302.

[0098] Furthermore, in this embodiment, the disk 301 is provided with a plurality of first holes, and the top end of the lower spiral shaft 1 includes a plurality of second holes. The first holes correspond to the second holes, and the top ends of the disk 301 and the lower spiral shaft 1 are fixedly connected by a fixing member passing through the first holes and the second holes.

[0099] Furthermore, the first hole and the second hole are round holes, and the fastener is a bolt.

[0100] Furthermore, in this embodiment, the tensioning mechanism 401 includes a plurality of third lifting lugs 4011 and the hand chain hoist 4012. The third lifting lugs 4011 are disposed at the top end inside the cylinder 2. The hand chain hoist 4012 is connected to the third lifting lugs 4011. The number of third lifting lugs 4011 is the same as the number of lifting rings.

[0101] Furthermore, the third lifting lug 4011 is made of steel plate.

[0102] Furthermore, there are six third lifting lugs 4011, which are welded to the top of the cylinder 2.

[0103] Furthermore, the lifting ring is a conical clamp-type lifting ring 402.

[0104] Furthermore, the conical clamp-type lifting ring 402 includes two half-rings 4021, multiple connecting plates 4022, and multiple second lifting lugs 4023. The number of second lifting lugs 4023 is the same as that of the third lifting lugs 4011. The connecting plates 4022 are fixedly connected to the connection points of the two half-rings 4021.

[0105] Furthermore, the semi-ring 4021, the connecting plate 4022, and the second lifting lug 4023 are all made of steel plate.

[0106] Furthermore, there are four connecting plates 4022 and six second lifting lugs 4023. The four connecting plates 4022 are symmetrically welded at the connection point of the two semi-rings 4021.

[0107] Furthermore, the lifting mechanism 403 is a split-type hydraulic jack.

[0108] Example 3

[0109] like Figure 1 As shown, the present invention provides a method for installing the lower spiral shaft of a vertical spiral stirred mill, using the aforementioned installation device for the lower spiral shaft of a vertical spiral stirred mill, comprising the following steps:

[0110] Step 1: Install the hoisting device 3 onto the upper end face of the lower spiral shaft 1;

[0111] Step 2: Fit the lifting ring onto the neck of the lower spiral shaft 1;

[0112] Step 3: Set up the tensioning mechanism 401, connect one end of the hand chain hoist 4012 to the third lifting lug 4011, and connect the other end of the hand chain hoist 4012 to the lifting ring;

[0113] Step 4: Install a lifting mechanism 403 at the bottom inside the cylinder 2;

[0114] Step 5: Use lifting equipment to lift the lower screw shaft 1;

[0115] Step 6: Suspend the lower spiral shaft 1 onto the lifting mechanism 403 inside the cylinder 2;

[0116] Step 7, dismantle hoisting device 3;

[0117] Step 8: Connect the lower spiral shaft 1 to the upper shaft 6, and remove the lifting mechanism 403 and the tensioning mechanism 401.

[0118] Example 4

[0119] like Figure 2 As shown, the present invention provides a method for installing the lower spiral shaft of a vertical spiral stirred mill, using the aforementioned installation device for the lower spiral shaft of a vertical spiral stirred mill, specifically including the following steps:

[0120] Step S1: After the cylinder 2 is installed on the foundation 11 and adjusted, the disc-shaped hoisting device 3 is installed onto the upper end face of the lower spiral shaft 1 using bolts passing through the first and second holes.

[0121] Step S2: Install the conical clamp-type lifting ring 402 onto the neck of the lower spiral shaft 1;

[0122] Step S3: The third lifting lug 4011 of the tensioning mechanism 401 is symmetrically and evenly welded to the top of the cylinder 2. Then, one end of the hook of the hand chain hoist 4012 is tied to the third lifting lug 4011, and the other end of the hook of the hand chain hoist 4012 is temporarily suspended.

[0123] Step S4: The lifting mechanism 403 is installed at the bottom of the cylinder 2;

[0124] Step S5: Hang the crane hook on the disc 301, lift the lower spiral shaft 1 to directly above the cylinder 2, and let it fall into the cylinder 2 until the top surface of the lower spiral shaft 1 is lower than the preset height of the upper end surface of the cylinder 2 and then stop descending.

[0125] Step S6: Attach the hook at the other end of the hand chain hoist 4012 of the tensioning mechanism 401 to the second lifting lug 4023 on the conical clamp-type lifting ring, operate the hand chain of the hand chain hoist 4012 to tighten it, and at the same time move the lifting mechanism 403 to directly below the lower spiral shaft 1 so that it lifts the lower spiral shaft 1 to a preset height;

[0126] Step S7: After confirming that the lower spiral shaft 1 is stable inside the cylinder 2, remove the crane hook 5 and dismantle the lifting device 3, and begin installing the main motor, reducer 8 and upper shaft 6.

[0127] Step S8: After the motor, reducer, and upper shaft 6 are installed, rotate the main shaft of the motor so that the upper shaft 6 matches the installation direction of the lower spiral shaft 1. Operate the lifting mechanism 403 to lift the lower spiral shaft 1, and at the same time tighten the tensioning mechanism 401. After the upper shaft 6 and the lower spiral shaft 1 are in contact, insert the connecting bolt and tighten it. After the bolt is tightened, loosen the tensioning mechanism 401 and the lifting mechanism 403, and remove the conical clamp-type lifting ring 402 to complete the installation of the lower spiral shaft 1.

[0128] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A lower screw shaft mounting device for a vertical screw stirring mill, said vertical screw stirring mill comprising a cylinder, a bearing support, a speed reducer support, a lower screw shaft, an upper shaft, a speed reducer and a main motor, characterized in that, The lower screw shaft mounting device of the vertical screw stirring mill comprises a hoisting device and a jacking tensioning system; The hoisting device comprises a lower screw shaft fixing part, a first lifting lug and a sling, one end of the sling being connected to the first lifting lug; the lower screw shaft fixing part can be connected to the upper end surface of the lower screw shaft; The jacking tensioning system comprises a tensioning mechanism, a lifting ring and a jacking mechanism, one end of the tensioning mechanism being connected to the cylinder, the other end of the tensioning mechanism being connected to the lifting ring; the jacking mechanism can be arranged at the bottom of the cylinder; the lifting ring can be sleeved on the neck of the lower screw shaft; The lower screw shaft fixing part is a disc, the shape and size of which are the same as the shape and size of the upper end surface of the lower screw shaft; the disc and the first lifting lug are made of steel plates; the first lifting lug comprises four lifting lugs which are symmetrically and uniformly welded on the top surface of the disc, and the sling comprises two groups of steel wire ropes which are hung on the four first lifting lugs; The tensioning mechanism comprises a plurality of third lifting lugs and a hand-operated hoist, the third lifting lugs being arranged at the top end of the cylinder, the hand-operated hoist being connected to the third lifting lugs, and the number of the third lifting lugs being the same as that of the lifting ring; the lifting ring is a conical clamp type lifting ring; the conical clamp type lifting ring comprises two half rings, a plurality of connecting plates and a plurality of second lifting lugs, the number of the second lifting lugs being the same as that of the third lifting lugs, and the connecting plates being fixedly connected at the connecting positions of the two half rings.

2. The vertical screw mixer lower screw shaft mounting device according to claim 1, characterized in that, A plurality of first holes are arranged on the disc, the top end of the lower screw shaft comprises a plurality of second holes, the first holes correspond to the second holes, and the disc and the top end of the lower screw shaft are fixedly connected by a fixing member through the first holes and the second holes.

3. A vertical screw agitator mill lower screw shaft mounting arrangement according to claim 2, characterised in that, The first holes and the second holes are round holes, and the fixing member is a bolt.

4. The vertical screw mixer lower screw shaft mounting device according to claim 1, characterized in that, The third lifting lugs are made of steel plates.

5. The vertical screw agitator mill lower screw shaft mounting arrangement of claim 4 wherein, The third lifting lugs are six, which are welded at the top end of the cylinder.

6. The vertical screw mixer lower screw shaft mounting arrangement of claim 1 wherein, The half rings, the connecting plates and the second lifting lugs are made of steel plates.

7. A vertical screw agitator mill lower screw shaft mounting arrangement according to claim 6, characterised in that, The connecting plates are four, and the second lifting lugs are six, the four connecting plates being symmetrically welded at the connecting positions of the two half rings.

8. A method of installing a lower screw shaft of a vertical screw agitator mill, characterized by, The vertical screw stirring mill lower screw shaft mounting device is used to perform the following steps: Step 1: install the hoisting device to the upper end surface of the lower screw shaft; Step 2: sleeve the lifting ring on the neck of the lower screw shaft; Step 3: set the tensioning mechanism, connect one end of the tensioning mechanism to the top end of the cylinder and connect the other end of the tensioning mechanism to the lifting ring; Step 4: set the jacking mechanism at the bottom of the cylinder; Step 5: hoist the lower screw shaft by using a hoisting device; Step 6: hang the lower screw shaft on the jacking mechanism in the cylinder; Step 7: remove the hoisting device; Step 8: connect the lower screw shaft with the upper shaft, and remove the jacking mechanism and the tensioning mechanism.

9. The method for installing the lower spiral shaft of a vertical spiral stirred mill according to claim 8, characterized in that, Specifically comprising the following steps: Step S1: after the cylinder is installed and adjusted, the disc-shaped hoisting device is installed to the upper end surface of the lower screw shaft by using a bolt through the first holes and the second holes; Step S2: install the conical clamp type lifting ring to the neck of the lower screw shaft; Step S3, the third pair of lifting lugs of the tensioning mechanism is symmetrically and uniformly welded at the top end of the cylinder, then the hook of the hand chain block is hung on the third pair of lifting lugs, and the other end of the hand chain block is temporarily suspended; Step S4, the jacking mechanism is arranged at the bottom of the cylinder; Step S5, the crane hook is hung on the disc, the lower spiral shaft is lifted to the top of the cylinder, and is lowered into the cylinder until the top surface of the lower spiral shaft is lower than the upper end surface of the cylinder by a preset height; Step S6, the hook of the other end of the hand chain block of the tensioning mechanism is hung on the second pair of lifting lugs of the conical clamp type lifting ring, the hand chain of the hand chain block is operated to be in a tensioning state, the jacking mechanism is moved to be below the lower spiral shaft, and the lower spiral shaft is lifted by a preset height; Step S7, after the lower spiral shaft is determined to be stable in the cylinder, the crane hook is released, the lifting device is removed, and the main motor, the speed reducer and the upper shaft are installed; Step S8, after the motor, the speed reducer and the upper shaft are installed, the main shaft of the motor is rotated, the upper shaft is matched with the installation direction of the lower spiral shaft, the jacking mechanism is operated to start jacking the lower spiral shaft, the tensioning mechanism is tensioned, the upper shaft is matched with the lower spiral shaft after the jacking, a connecting bolt is penetrated and tightened, the tensioning mechanism and the jacking mechanism are loosened after the bolt is fastened, the conical clamp type lifting ring is removed, and the installation of the lower spiral shaft is completed.

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