Blast furnace tuyere large sleeve boring device

Abstract

An embodiment of the present invention provides a device for boring holes in a blast furnace tuyere sleeve, comprising: a power system; a spindle assembly comprising a hollow spindle, the spindle being transmission-connected to the power system; a positioning support connected to the spindle assembly, the positioning support being used to position the spindle relative to the tuyere sleeve; a feed frame fixedly connected to the spindle, the feed frame having a strip groove, the angle between the strip groove and the axis of the spindle being equal to the machining slope of the tuyere sleeve; a broaching mechanism comprising a feed screw passing through the spindle and transmission-connected to the spindle; a tool holder assembly threadedly connected to the feed screw, the feed screw driving the tool holder assembly to feed axially; the tool holder assembly slidingly engaging the strip groove of the feed frame, such that when the tool holder assembly is fed axially, the feed frame drives the tool holder assembly to feed radially. The present invention has the characteristics of uniform cutting and easy operation.

Description

Technical Field

[0001] The invention belongs to the technical field of metal cutting equipment, and in particular relates to a large sleeve boring device for a blast furnace tuyere. Background Art

[0002] The tuyere sleeve is an essential key component for blowing in hot air during blast furnace ironmaking. When the blast furnace is in operation, hot air at 1200-1300℃ must pass through the tuyere to enter the furnace body. The tuyere sleeve consists of several parts, including the tuyere flange, the tuyere sleeve, the middle tuyere sleeve, and the small sleeve clamping device. Under normal circumstances, the tuyere flange and the tuyere sleeve are not replaced within a generation of furnace life. Therefore, their manufacturing quality, especially the processing quality of the contact surface between the sleeve and the middle sleeve, is very strict to ensure the sealing of the tuyere equipment. The tuyere sleeve of the blast furnace body needs to be processed on-site during construction or maintenance. The deformation caused by the on-site welding and installation of the tuyere sleeve during the construction of the blast furnace and the reserved processing amount are cut off by boring, so as to ensure the sealing between the tuyere sleeve and the middle sleeve and the centering position of each sleeve.

[0003] Usually, the number of tuyere in a blast furnace is about 2 to 4 times the diameter of the furnace in meters. The number of tuyere in a blast furnace with a capacity of more than 2,000 cubic meters is more than 30. The large and medium sleeves of the tuyere are sealed with a conical surface. The contact of the conical surfaces realizes self-locking, and the outside is generally tightened with threads. The roughness of the tuyere conical surface is required to exceed Ra3.2, and a mixed seal is added to prevent the leakage of hot air from the gas cushion. The blast furnace tuyere is composed of a large sleeve, a medium sleeve, and a small sleeve connected in sequence, and the large sleeve is welded to the furnace shell as a whole. The on-site construction process of the furnace body generally produces a deformation of ±5mm in the radial direction. At present, the processing speed for correcting deformation is slow, the processing accuracy is low, and the processing surface quality is poor. The correction period of the large sleeve is long, which affects the construction progress of the blast furnace; the low processing accuracy of the large sleeve leaves a safety hazard to the operation of the blast furnace. Summary of the Invention

[0004] In view of the above problems existing in the prior art, the purpose of the embodiments of the present invention is to provide a large-sleeve boring device for a blast furnace tuyere, which has the characteristics of uniform cutting and easy operation.

[0005] The embodiment of the present invention provides a blast furnace tuyere large sleeve boring device, comprising:

[0006] Powertrain;

[0007] A main shaft assembly, comprising a hollow main shaft, the main shaft being in transmission connection with the power system, the power system being used to drive the main shaft to rotate;

[0008] A positioning support connected to the main shaft assembly, the positioning support being used to position the main shaft relative to the tuyere sleeve;

[0009] A feed frame, which is fixedly connected to the main shaft, and has a strip groove, wherein the angle between the strip groove and the axis of the main shaft is equal to the processing slope of the tuyere sleeve;

[0010] The broaching mechanism includes a feed screw, which is passed through the main shaft and is in driving connection with the main shaft;

[0011] The tool holder assembly is threadedly connected to the feed screw, and the feed screw drives the tool holder assembly to feed axially; the tool holder assembly is slidingly matched with the strip groove, and when the tool holder assembly feeds axially, the feed frame drives the tool holder assembly to feed radially.

[0012] Optionally, the main shaft assembly further includes:

[0013] A bearing seat, which is used to be fixedly connected to the positioning support;

[0014] A precision bearing is fixedly sleeved on the main shaft and fixedly assembled on the bearing seat.

[0015] Optionally, the positioning support includes two cross support frames, which are arranged on both sides of the bearing seat, and the cross support frames include:

[0016] a support seat, which is used to be fixedly connected to the bearing seat of the main shaft assembly;

[0017] Four threaded rods, one end of each of the four threaded rods being threadedly connected to the support seat, the threaded rods being evenly distributed around the circumference of the support seat, and the threaded rods being arranged along the radial direction of the main shaft so that a straight line on which the four threaded rods are located forms a cross;

[0018] Four support blocks are respectively connected to the other ends of the four threaded rods through self-aligning bearings.

[0019] Optionally, the projections of the two cross support frames in the axial direction of the main shaft are in the shape of a cross.

[0020] Optionally, the feed frame includes:

[0021] A clamping seat, used for fixing to the main shaft;

[0022] A chute plate, on which the strip groove is formed, and the clamping seat is fixedly connected to one end of the chute plate;

[0023] A connecting cover is used to be fixed to the main shaft, and the connecting cover is fixedly connected to the other end of the chute plate.

[0024] Optionally, the broaching mechanism further includes:

[0025] A tool setting handwheel, which is fixedly connected to one end of the feed screw;

[0026] A feed gear set, which is used to transmit and connect the feed screw and the main shaft, and the main shaft drives the feed screw to rotate through the feed gear set;

[0027] The screw seat realizes the positioning and rotation support of the feed screw through the bearing, and the screw seat is fixed to the support seat of the positioning support.

[0028] Optionally, the feed gear set includes:

[0029] A driving gear, which is fixedly sleeved on the main shaft;

[0030] A driven gear fixedly sleeved on the feed screw;

[0031] A reduction gear connects the driving gear and the driven gear, and the reduction gear is used to adjust the transmission ratio between the driving gear and the driven gear.

[0032] Optionally, the tool holder assembly includes:

[0033] A sliding knife bar, comprising an assembly portion, a sliding rod connected to the assembly portion, and a counterweight rod connected to the assembly portion, wherein the sliding rod and the counterweight rod are respectively arranged on both sides of the assembly portion, the sliding rod and the counterweight rod are coaxially arranged and perpendicular to the main shaft, the assembly portion is slidably sleeved on the main shaft, and the assembly portion and the main shaft are circumferentially limited;

[0034] A lead screw nut, which is fixed to the sliding cutter bar and is threadably engaged with the feed screw;

[0035] a knife sheath, the sliding sleeve of which is arranged on the sliding rod;

[0036] A knife-pushing rod is threadedly connected to the knife sleeve, one end of which is slidably connected to the sliding knife rod, and the knife-pushing rod is used to drive the knife sleeve to move along the sliding rod;

[0037] a cutter head connected to the cutter sleeve;

[0038] A counterweight is connected to the counterweight rod, and the dynamic balance of the entire tool holder is balanced by adjusting the position of the counterweight on the counterweight rod.

[0039] Optionally, the tool sleeve has an open thread that matches the thread of the tool push rod.

[0040] Optionally, the pusher rod includes:

[0041] a fixing portion, which is slidably connected to the assembly portion, and the fixing portion is slidably engaged with the strip groove;

[0042] a threaded rod, one end of which is rotatably connected to the fixing portion, the threaded rod being threadably engaged with the tool sleeve;

[0043] a handwheel fixed to the other end of the threaded rod;

[0044] A scale plate is fixedly connected to the threaded rod.

[0045] Compared with the prior art, the blast furnace tuyere large sleeve boring device provided in the embodiment of the present invention realizes axial feeding through the gear differential feeding of the main shaft and the feed screw, so that the tool cutting is more uniform, the processing surface roughness is smoother, the sealing performance of the tuyere large sleeve is improved, and the service life of the tuyere large sleeve is extended.

[0046] It is more convenient and quick to use and operate. After positioning and alignment, no human intervention is required during each cut, and the equipment operates stably and reliably. Both the electric frequency conversion speed regulation and the hydraulic motor speed regulation are very easy to control in operation.

[0047] The structure is compact, the equipment and the tuyere are firmly positioned, there are few steps in transportation, installation and commissioning, and it is easy to maintain and store during on-site use.

[0048] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

[0049] This disclosure is an overview of various implementations or examples of the technology, and is not a comprehensive disclosure of the full scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar components in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar components. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the description and claims, serve to illustrate the embodiments of the invention. Where appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive of the embodiments of the present apparatus or method.

[0051] Figure 1 This is a schematic diagram of the connection components of the blast furnace tuyere large sleeve boring device according to an embodiment of the present invention.

[0052] Figure 2 This is a schematic diagram of the main shaft assembly of the blast furnace tuyere large sleeve boring device according to an embodiment of the present invention.

[0053] Figure 3 This is a schematic diagram of the positioning and support of a large sleeve boring device for a blast furnace tuyere according to an embodiment of the present invention.

[0054] Figure 4Schematic diagram of the feed frame of the blast furnace tuyere large sleeve boring device according to an embodiment of the present invention.

[0055] Figure 5 This is a schematic diagram of the broaching mechanism of the large sleeve boring device for the blast furnace tuyere according to an embodiment of the present invention.

[0056] Figure 6 This is a schematic diagram of a tool holder assembly for a large-set boring device for a blast furnace tuyere according to an embodiment of the present invention.

[0057] Figure 7 This is a schematic diagram of the principle of a large-sleeve boring device for a blast furnace tuyere according to an embodiment of the present invention.

[0058] Figure 8a and Figure 8b Schematic diagram of the feed gear action of the large sleeve boring device of the blast furnace tuyere according to the embodiment of the present invention, wherein Figure 8a This is a schematic diagram of the feed gear disengagement. Figure 8b Schematic diagram of feed gear meshing.

[0059] Figure 9 This is a schematic diagram of the radial feed of a large sleeve boring device for a blast furnace tuyere according to an embodiment of the present invention.

[0060] Figure 10 This is a schematic cross-sectional view of the shaft rod of the large sleeve boring device for the blast furnace tuyere according to an embodiment of the present invention.

[0061] Figure 11 This is a schematic cross-sectional view of the assembly of the tool holder shaft seat of the blast furnace tuyere large sleeve boring device according to an embodiment of the present invention.

[0062] Reference numerals:

[0063] 1-spindle assembly; 2-positioning support; 3-feed frame; 4-broaching mechanism; 5-tool holder assembly; 6-air inlet sleeve; 7-power system; 101-spindle; 102-bearing seat; 103-precision bearing; 202-support seat; 203-threaded rod; 201-support block; 204-self-aligning bearing; 301-clamping seat; 302-bevel plate; 303-connecting cover; 320-strip groove; 401-tool setting handwheel; 402-feed gear set; 403-feed screw; 404-screw seat; 501-cutter head; 502-tool sleeve; 503-knife push rod; 504-screw nut; 505-sliding tool rod; 506-counterweight; 531-fixed part; 532-threaded rod; 533-handwheel; 534-slider. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0066] In order to keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0067] The embodiment of the present invention provides a large sleeve boring device for blast furnace tuyere. Figure 1 The blast furnace tuyere large sleeve boring device comprises:

[0068] Powertrain 7;

[0069] The spindle assembly 1 includes a hollow spindle 101, which is in transmission connection with the power system 7, and the power system 7 drives the spindle 101 in the spindle assembly 1 to rotate;

[0070] Positioning support 2, which is connected to the main shaft assembly 1 and is used to position the main shaft 101 relative to the tuyere sleeve 6;

[0071] The feed frame 3 is fixedly connected to the main shaft 1 and has a strip groove 320. The angle between the strip groove and the axis of the main shaft is equal to the processing slope of the tuyere sleeve 6.

[0072] The broaching mechanism 4 includes a feed screw 403, which is disposed inside the spindle 101 and is in transmission connection with the spindle 101; the feed screw 403 is driven by the spindle 101 and can move axially relative to the spindle 101 to achieve axial feeding;

[0073] The tool holder assembly 5 is threadedly connected to the feed screw 403, and the feed screw 403 drives the tool holder assembly to feed axially; the tool holder assembly 5 slides with the strip groove 320 of the feed frame 3, and when the tool holder assembly 5 feeds axially, the feed frame 3 drives the tool holder assembly 5 to feed radially.

[0074] The blast furnace tuyere large sleeve boring device provided in the embodiment of the present invention realizes axial feeding through the gear differential feeding of the main shaft 101 and the feed screw 403, and realizes radial feeding through the sliding cooperation of the tool holder assembly 5 and the strip groove 320 of the feed frame 3, so that the tool cutting is more uniform, the processing surface roughness is smoother, the sealing performance of the tuyere large sleeve is improved, and the service life of the tuyere large sleeve is extended.

[0075] The blast furnace tuyere large-sleeve boring device provided by the present invention is more convenient and quick to use and operate. After positioning and alignment, no human intervention is required during each cut, and the device operates stably and reliably. Both electric variable frequency speed regulation and hydraulic motor speed regulation are very easy to control.

[0076] The blast furnace tuyere large sleeve boring device provided by the embodiment of the present invention has a compact structure, the device and the tuyere large sleeve are firmly positioned, transportation, installation and debugging steps are few, and it is easy to maintain and store during on-site use.

[0077] In some embodiments, the spindle assembly 1 also includes a bearing seat 102 and a precision bearing 103. The bearing seat 102 is used to be fixedly connected to the positioning support 2. The precision bearing 103 is fixedly sleeved on the spindle, and the precision bearing 103 is fixedly assembled on the bearing seat 102. The precision bearing 103 constrains the spindle to rotate in the bearing seat. The spindle 101 rotates under the drive of an external power system, and transmits the power of the external power system to the device processing rotation mechanism. The spindle 101 ensures the rigidity, strength, stability during movement, etc. of the system. The spindle 101 is a hollow shaft. The broaching mechanism 4 is installed inside the spindle 101, and the broaching mechanism 4 realizes the axial feed of the tool.

[0078] See also Figure 10 In some embodiments, the positioning support 2 includes two cross support frames, which are arranged on both sides of the bearing seat 102. The cross support frame includes a support seat 202, a threaded rod 203, a support block 201 and a self-aligning bearing 204.

[0079] See also Figure 10, the support seat 202 is used to be fixedly connected to the bearing seat 102 of the main shaft assembly 1. The support seat 202 can be disc-shaped. The support seat 202 has a threaded connection portion for connecting the threaded rod 203 on its circumference. The threaded connection portions are evenly distributed on the circumference of the support seat 202. The threaded connection portion can be formed by providing a screw hole on the circumference of the support seat 202. The threaded connection portion can also be formed by providing a connecting tube with an internal thread on the circumference of the support seat 202. The number of threaded connections can be a multiple of the number of threaded rods 203, or the same as the number of threaded rods 203. For example, when there are four threaded rods 203, there can be four threaded connections or eight threaded connections. There are four threaded rods 203, one end of which is threadedly connected to the support base 202. The threaded rods 203 are evenly distributed around the circumference of the support base 202 and arranged radially along the main shaft 101, so that the straight line along which the four threaded rods 203 lie forms a cross. In other words, the four threaded rods 203 are connected to the support base 202 in a cross-shaped pattern. The support block 201 is connected to the other ends of the threaded rods 203 via self-aligning bearings 204. Each cross support frame is adjustable at four points, and the cross shape facilitates calculation of the adjustment amount.

[0080] In an exemplary embodiment, projections of the two cross supports in the axial direction of the main shaft 101 are in the shape of a cross.

[0081] The two paired cross supports form a "M"-shaped support structure, securing the entire tuyere borer assembly. The axis is aligned through the coordinated adjustment of the legs. Threaded rods 203 adjust the support length, while self-aligning bearings 204 ensure ideal contact between support block 201 and the mounting surface, ensuring stable overall positioning and immunity to vibration during machine operation.

[0082] In some embodiments, the feeding frame 3 includes a clamping seat 301 , a chute plate 302 and a connecting cover 303 .

[0083] The clamping base 301 is used to secure the spindle 101. The chute plate 302 is provided with a strip groove 320. The angle between the strip groove 320 and the axis of the spindle 101 is equal to the machined inclination of the tuyere sleeve. The clamping base 301 is fixedly connected to one end of the chute plate 302. The connecting cover 303 is used to secure the spindle 101. The connecting cover 303 is fixedly connected to the other end of the chute plate 302. The clamping base 301 can be clamped and secured to the spindle 101. The connecting cover 303 can be fixed to the end of the spindle 101.

[0084] The feed frame 3 is fixed to the main shaft 101 through the clamping seat 301 and the connecting cover 303, which can form a stable structure at the far end of the main shaft 101. The strip groove 320 of the chute plate 302 is manufactured according to the slope required for processing. The chute plate 302 can be obtained by processing the inclined strip groove 320 on the flat plate. Figure 9When the boring device is running, the tool pusher rod 503 in the tool holder assembly 5 cooperates with the strip groove 320, and the tool pusher rod 503 slides along the strip groove 320 to realize radial feeding of the tool holder assembly.

[0085] In some embodiments, the broaching mechanism 4 further includes a tool setting handwheel 401 , a feed gear set 402 and a screw seat 404 .

[0086] The tool setting hand wheel 401 is fixedly connected to one end of the feed screw 403. By operating the tool setting hand wheel 401, the feed screw 403 can be rotated to achieve tool setting before processing and retracting the tool after each processing is completed.

[0087] Feed gear set 402 is used to connect feed screw 403 and spindle 101. Spindle 101 drives feed screw 403 to rotate through feed gear set 402. The differential feed between the gears of spindle 101 and feed screw 403 achieves axial feed, making the tool cutting more uniform, the machined surface roughness smoother, and the sealing performance of the tuyere sleeve improved, extending the service life of the tuyere sleeve.

[0088] The screw seat 404 realizes the positioning and rotation support of the feed screw 403 through the bearing. The screw seat 404 can be fixed to the connection cover 303 of the feed frame 3.

[0089] The feed screw 403 mates with the screw nut 504 in the tool holder assembly 5. Rotation of the feed screw 403 drives the tool holder assembly 5 in axial motion, achieving axial feed. The feed gear set 402 receives power from the spindle 101, rotating the feed screw 403. This deceleration reduces the speed of the feed gear set 402 to achieve a reasonable feed rate. The tool setting handwheel 401 is used for tool setting before machining and for retracting the tool after each cut. When in use, the feed gear set 402 is disengaged, and the tool setting handwheel 401 rotates the feed screw 403, achieving axial translation of the tool holder assembly 5 to the initial machining position. This allows for rapid movement of the tool holder assembly.

[0090] In an exemplary embodiment, the feed gear set 402 includes a driving gear, a driven gear, and a reduction gear. The driving gear is fixedly mounted on the main shaft 101. The driven gear is fixedly mounted on the feed screw 403. The reduction gear connects the driving gear and the driven gear and is used to adjust the transmission ratio between the driving gear and the driven gear.

[0091] In some embodiments, the tool holder assembly 5 includes a sliding tool rod 505 , a lead screw nut 504 , a tool sleeve 502 and a tool pushing rod 503 .

[0092] The sliding knife rod 505 includes an assembly part, a sliding rod connected to the assembly part, and a counterweight rod connected to the assembly part. The sliding rod and the counterweight rod are respectively arranged on both sides of the assembly part. The sliding rod and the counterweight rod are coaxially arranged and perpendicular to the main shaft. The assembly part is slidably sleeved on the main shaft, and the assembly part and the main shaft are circumferentially limited.

[0093] The lead screw nut 504 is fixed to the sliding knife rod 505, and the lead screw nut 504 is threadedly engaged with the feed screw 403. In an exemplary embodiment, the lead screw nut 504 is fixed to the assembly portion of the sliding knife rod 505. When the feed screw 403 rotates, the lead screw nut 504 moves axially, and the sliding knife rod 505 moves axially accordingly.

[0094] The knife sleeve 502 is slidably mounted on the slide bar. The knife sleeve 502 slides along the slide bar to achieve radial feeding. The knife sleeve 502 is used to assemble the knife head 501.

[0095] The push rod 503 is threadedly connected to the knife sleeve 502. One end of the push rod 503 is slidably connected to the sliding knife rod 505. The push rod 503 is used to drive the knife sleeve 502 along the sliding rod. The push rod 503 slides in engagement with the strip groove 320 of the feed frame 3. When the push rod 503 moves axially under the guidance of the sliding knife rod 505, the strip groove 320 forms a certain angle with the axial direction. Under the restriction of the strip groove 320, the push rod 503 slides relative to the sliding knife rod 505, driving the knife sleeve 502 along the sliding rod, thereby achieving radial feeding.

[0096] The cutter head 501 is connected to the cutter sleeve 502 .

[0097] The counterweight is connected to the counterweight rod, and the dynamic balance of the entire tool holder is balanced by adjusting the position of the counterweight on the counterweight rod.

[0098] The cutter head 501 is fastened to the tool holder 502, which can slide on the sliding tool rod 505. The position of the counterweight is adjusted to achieve dynamic balance. The adjusted counterweight is fastened to the sliding tool rod 505. The lead screw nut 504 is fastened to the sliding tool rod 505. When the feed screw 403 acts on the lead screw nut 504, the lead screw nut 504 drives the sliding tool rod 505 to achieve axial feeding. One end of the push rod 503 is slidably connected to the sliding tool rod 505, and the other end is threadedly connected to the tool holder 502. Driven by the push rod 503, the tool holder 502 slides radially on the sliding tool rod 505 along the main shaft 101 to achieve radial feeding. The cutter head consists of a blade and a shank, and is divided into two types: rough boring and fine boring. When the boring device is in operation, the excess metal deformation and processing allowance on the tuyere sleeve 6 are directly removed during movement.

[0099] In some embodiments, the tool sleeve 502 has an open thread that mates with the threaded blade pusher 503. Loosening the open thread allows the pusher 503 to rotate, and the threaded action adjusts the position of the tool sleeve 502 on the sliding tool rod 505. Tightening the open thread secures the tool sleeve 502 to the pusher 503. The open thread on the tool sleeve 502 tightens the thread during operation.

[0100] See also Figure 11In an exemplary embodiment, the pusher rod 503 may include a fixed portion 531, a threaded rod 532 and a handwheel 533. The fixed portion 531 is slidably connected to the sliding knife rod 505, and the fixed portion is slidably matched with the strip groove 320. For example, it is slidably connected to the assembly portion. One end of the threaded rod 532 is rotatably connected to the fixed portion 531, and the threaded rod 532 is threadedly matched with the tool sleeve 502. For example, the external thread on the threaded rod 532 is matched with the open thread of the tool sleeve. The handwheel 533 is fixed to the other end of the threaded rod 532. The dial is fixedly connected to the threaded rod. The threaded rod rotates relative to the stationary horizontal reading.

[0101] The push rod 503 has a handwheel 533 at one end and a fixed part 531 with a scale at the other end. The middle section is a threaded rod 532 with fine threads. The push rod 503 is locked with the tool holder 502 through the open thread on the tool holder. When the thread pair is loosened, the reading on the scale can be read by rotating the threaded rod to adjust the processing feed rate. After the boring device is aligned and the tool is set, the open thread is clamped. The push rod 503 has a slider 534 that slides with the strip groove 320 on the feed frame 3. The slider 534 moves under the restriction of the strip groove 320 on the feed frame 3. Driven by the slider 534, the push rod 503 pushes the tool holder 502 to move radially along the main shaft 101, realizing radial feeding of the tool head 501. The counterweight is adjusted on the sliding tool rod to balance the dynamic balance of the entire tool holder.

[0102] When setting the tool using the handwheel, the tool pusher can be rotated clockwise to extend the tool, and counterclockwise to retract the tool.

[0103] The radial feed of the tuyere boring device of the present invention is adjusted by a screw, and the feed amount is readable and controllable, which shortens the equipment preparation time before processing and the tool adjustment time during processing, and improves the equipment processing efficiency. The equipment can more effectively control the size of the tuyere sleeve and achieve higher dimensional accuracy.

[0104] The power system 7 can be composed of either an electric or hydraulic system. The choice can be tailored to the specific working environment at the construction site. The hydraulic system uses a hydraulic motor to output torque, with the speed controlled by a hydraulic valve assembly. The electric system uses a motor to output torque, with the speed controlled by a frequency converter assembly. Both drive systems use a speed reducer to reduce speed and increase torque, achieving the required spindle motion parameters for high-precision workpiece cutting.

[0105] The working process of the blast furnace tuyere large sleeve boring device of the present invention is as follows:

[0106] 1. Pre-processing preparation: Select appropriate lifting or transporting tools based on the blast furnace construction site environment to transport the tuyere large sleeve 6 (hereinafter referred to as the large sleeve) boring device (hereinafter referred to as "tuyere boring") of the present invention to the blast furnace tuyere platform. The clearance between the on-site platform and the furnace body should meet the safety requirements for personnel operation, or meet the requirements after laying a bedding. A suitable and stable power supply should be available on site.

[0107] 2. Clean the positioning and machining conical surfaces of the inner hole of the large tuyere sleeve step to ensure a stable boring foundation and free of impurities during machining. Measure the diameter of the positioning surface of the large tuyere sleeve and adjust the length of the eight legs of the positioning support 2 to be slightly smaller than the radius of the positioning section. Measure and record the vertical and horizontal diameters of the small opening of the machining conical surface of the large tuyere sleeve 6, and calculate and record the machining volume. The toolholder assembly 5 should be in a shortened position and ready for positioning.

[0108] 3. With the axial direction of the large sleeve hole as the Z axis, the vertical direction as the Y axis, and the horizontal direction as the X axis, hoist the tuyere boring machine into the large sleeve inner hole positioning step, fix the tuyere boring Z axis position according to the processing stroke, tighten and lock the two vertical threaded rods 203 of the outer cross support frame, and pre-tighten the internal cross support frame to make the support block 201 contact with the positioning surface of the tuyere large sleeve 6.

[0109] 4. Use appropriate measuring tools to initially align the coaxiality of the tuyere boring spindle and the hole to be machined, controlling the accuracy to within 5mm. Disconnect the feed gear set of the broaching mechanism, install the rough boring cutter head, adjust the push rod so that the cutter head is radially close to the machined surface of the large sleeve, and then use the tool setting handwheel to adjust the axial distance between the cutter head and the small opening of the large sleeve tapered hole to facilitate positioning and measurement.

[0110] 5. Use a spirit level to confirm the spindle is level. Manually rotate the tool holder assembly to calibrate the distance between the cutter head and the large sleeve, up and down, left and right. If there is any deviation, adjust the extension length of the eight threaded rods of the inner and outer cross supports so that the difference in the top and bottom, left and right distances between the spindle and the inner hole of the large sleeve is less than 1mm. Tighten the four threaded rods of the outer cross support.

[0111] 6. Manually rotate the tool holder assembly to calibrate the cutter head so that the difference between the cutter head and the upper and lower inner holes of the large sleeve is less than 0.1mm. According to the air outlet to be processed, the alignment is completed.

[0112] 7. See Figure 6 and Figure 11 , adjust the tool holder assembly according to the measured and calculated processing volume, rotate the push rod clockwise, and extend the tool to the required single cutting volume. Determine the appropriate rough processing plan based on the reserved processing allowance and the degree of deformation of the large set. Figure 8a , turn the tool setting hand wheel, push the frame assembly through the feed screw, and make it close to the surface to be processed. Figure 8b , engage the feed gear and tighten it, confirm that all parts are tightened, there are no other debris, and the equipment is well lubricated, then connect the power supply of the power system and conduct a jog test run. If there are no problems, continue to operate the machine, and clean the tool chips in time until the rough machining is completed.

[0113] 8. After rough boring is complete, shut off the power system and disengage the feed gear set. Measure the finished dimensions, check the taper of the machined surface, calculate the finishing cut according to the drawing, replace the finishing boring head, and adjust the head feed by rotating the push rod according to the calculated cut. Engage the feed gear set, check that the equipment is in good condition and the surrounding environment is safe, then power on the power system, adjust the power system to increase the spindle speed, and begin finishing. Clean the cutting chips generated during processing to ensure stable operation of the equipment.

[0114] 9. After the fine boring is completed and the inspection is qualified, the processing surface is protected according to the site requirements. After the processing is completed, the tool holder assembly is adjusted to the shortened state, the eight threaded rods of the two cross support frames are loosened, the air inlet boring is removed from the large sleeve, and the next large sleeve to be processed is installed. Repeat the above steps until all the large sleeves of the furnace body are processed.

[0115] 10. After the tuyere boring operation is completed, clean, lubricate and pack it for proper storage.

[0116] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more versions thereof) may be used in combination with each other, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations. The scope of the present invention should be determined with reference to the appended claims and the full range of equivalents to which these claims are entitled.

Claims

1. A large sleeve boring device for blast furnace tuyere, characterized in that: include: Powertrain; A main shaft assembly, comprising a hollow main shaft, the main shaft being in transmission connection with the power system, the power system being used to drive the main shaft to rotate; A positioning support connected to the main shaft assembly, the positioning support being used to position the main shaft relative to the tuyere sleeve; A feed frame, which is fixedly connected to the main shaft, and has a strip groove, wherein the angle between the strip groove and the axis of the main shaft is equal to the processing slope of the tuyere sleeve; The broaching mechanism includes a feed screw, which is passed through the main shaft and is in driving connection with the main shaft; The tool holder assembly is threadedly connected to the feed screw, and the feed screw drives the tool holder assembly to feed axially; the tool holder assembly is slidably matched with the strip groove, and when the tool holder assembly feeds axially, the feed frame drives the tool holder assembly to feed radially; The feed frame comprises: A clamping seat, which is used to be fixed to the main shaft; An inclined slot plate is provided with the strip-shaped slot, and the clamping seat is fixedly connected to one end of the inclined slot plate; a connecting cover, which is used to be fixed to the main shaft, and the connecting cover is fixedly connected to the other end of the chute plate; The tool holder assembly comprises: A sliding knife bar, comprising an assembly portion, a sliding rod connected to the assembly portion, and a counterweight rod connected to the assembly portion, wherein the sliding rod and the counterweight rod are respectively arranged on both sides of the assembly portion, the sliding rod and the counterweight rod are coaxially arranged and perpendicular to the main shaft, the assembly portion is slidably sleeved on the main shaft, and the assembly portion and the main shaft are circumferentially limited; A lead screw nut, which is fixed to the sliding cutter bar and is threadably engaged with the feed screw; a knife sheath, the sliding sleeve of which is arranged on the sliding rod; A knife-pushing rod is threadedly connected to the knife sleeve, one end of which is slidably connected to the sliding knife rod, and the knife-pushing rod is used to drive the knife sleeve to move along the sliding rod; a cutter head connected to the cutter sleeve; A counterweight is connected to the counterweight rod, and the dynamic balance of the entire tool holder is balanced by adjusting the position of the counterweight on the counterweight rod.

2. The blast furnace tuyere large sleeve boring device according to claim 1, characterized in that: The main shaft assembly also includes: A bearing seat, which is used to be fixedly connected to the positioning support; A precision bearing is fixedly sleeved on the main shaft and fixedly assembled on the bearing seat.

3. The blast furnace tuyere large sleeve boring device according to claim 2, characterized in that: The positioning support includes two cross supports, which are arranged on both sides of the bearing seat, and the cross supports include: a support seat, which is used to be fixedly connected to the bearing seat of the main shaft assembly; Four threaded rods, one end of each of the four threaded rods being threadedly connected to the support seat, the threaded rods being evenly distributed around the circumference of the support seat, and the threaded rods being arranged along the radial direction of the main shaft so that a straight line on which the four threaded rods are located forms a cross; Four support blocks are respectively connected to the other ends of the four threaded rods through self-aligning bearings.

4. The blast furnace tuyere large sleeve boring device according to claim 3, characterized in that: The projections of the two cross support frames in the axial direction of the main shaft are in the shape of a cross.

5. The blast furnace tuyere large sleeve boring device according to claim 1, characterized in that: The broaching mechanism further comprises: A tool setting handwheel, which is fixedly connected to one end of the feed screw; A feed gear set, which is used to transmit and connect the feed screw and the main shaft, and the main shaft drives the feed screw to rotate through the feed gear set; The screw seat realizes the positioning and rotation support of the feed screw through the bearing, and the screw seat is fixed to the support seat of the positioning support.

6. The blast furnace tuyere large sleeve boring device according to claim 5, characterized in that: The feed gear set comprises: A driving gear, which is fixedly sleeved on the main shaft; A driven gear fixedly sleeved on the feed screw; A reduction gear connects the driving gear and the driven gear, and the reduction gear is used to adjust the transmission ratio between the driving gear and the driven gear.

7. The blast furnace tuyere large sleeve boring device according to claim 6, characterized in that: The tool sleeve has an opening thread that matches the thread of the tool push rod.

8. The blast furnace tuyere large sleeve boring device according to claim 6, characterized in that: The pusher rod comprises: a fixing portion, which is slidably connected to the assembly portion, and the fixing portion is slidably engaged with the strip groove; a threaded rod, one end of which is rotatably connected to the fixing portion, the threaded rod being threadably engaged with the tool sleeve; a handwheel fixed to the other end of the threaded rod; A scale plate is fixedly connected to the threaded rod.

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