Production process and equipment of hollow steel for heavy drill rod

Abstract

The present invention relates to a hollow steel production process and production device for heavy-duty drill rods, and the production device includes a six-roll mill, a heating furnace, a push rod, a round rod, a core tube, a supporting device and a driving device. A supporting frame and a heating device are provided inside the heating furnace, a rod adding port is provided on the top surface of the heating furnace, and a through hole is provided on the outer wall respectively, and the push rod is passed through a through hole to the inside of the heating furnace. The six-roll mill is arranged between the supporting device and the heating furnace. A core tube is supported on the supporting block, and a round rod is passed through the middle of the core tube. The round rod and the through hole are coaxially arranged, and one end of the core tube passes through the rolling hole of the six-roll mill and is placed between the six-roll mill and the heating furnace, and a conical head is provided at one end of the round rod. A connecting shaft is fixed to the output shaft of the driving device, and the connecting shaft is coaxially fixedly connected with one end of the round rod away from the through hole. The present invention performs drilling at the mouth of the insulation furnace to maintain the temperature of the steel rod, thereby reducing the difficulty of drilling. At the same time, drilling and rolling are performed at the same time, shortening the process time, thereby improving production efficiency.

Description

Technical Field

[0001] The invention belongs to a drill steel preparation process, and in particular relates to a hollow steel production process and a production device for heavy drill rods. Background Art

[0002] Heavy-duty hollow steel for drill rods (i.e. drill steel) refers to drill steel tools used for impact drilling. The main purpose of drill steel tools is to match rock drilling machinery and to be used as tools for drilling and blasting holes in rock or rock and soil drilling and blasting construction. Therefore, the mechanical properties of drill steel are relatively strict, and it is formed by rolling round steel bars in production.

[0003] Before rolling, it needs to be heated first, then drilled and rolled. The existing drilling process is to take the heated steel bar out of the heating furnace, then transfer it to the drilling section for drilling, and after the whole bar is drilled, it is rolled into a hexagonal shape. First, after the steel bar is taken out of the heating furnace, the temperature will drop, and the lower the temperature, the higher the hardness, which is not conducive to drilling; secondly, after the whole bar is drilled, it is rolled, which prolongs the time between the two process arrangements. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a production process and a production device for hollow steel for heavy-duty drill rods. The present invention performs drilling at the mouth of a heat-insulating furnace to maintain the temperature of the steel rod, thereby reducing the difficulty of drilling. At the same time, drilling and rolling are performed simultaneously, thereby shortening the process time and improving the production efficiency.

[0005] The technical solution adopted by the present invention to solve the problems existing in the prior art is:

[0006] A hollow steel production device for heavy drill rods comprises a six-roll rolling mill, a heating furnace, a push rod, a round bar, a core tube, a supporting device and a driving device.

[0007] An inclined support frame is provided inside the heating furnace, a heating device is provided below the support frame, a rod adding port is provided on the top surface of the heating furnace just above the highest point of the support frame, a through hole is provided on the outer wall of the heating furnace on both sides of the low point of the support frame, and a push rod is passed through a through hole to the interior of the heating furnace.

[0008] The supporting device comprises a supporting platform and at least two supporting blocks, and the supporting blocks are slidably arranged on the supporting platform.

[0009] The six-roller rolling mill is arranged between the supporting device and the heating furnace, and the rolling hole in the middle of the six-roller rolling mill is coaxially arranged with the through hole.

[0010] The support block supports a core tube, a round rod is arranged in the middle of the core tube, the round rod is coaxially arranged with the through hole, and one end of the core tube passes through the rolling hole of the six-roll mill and is placed between the six-roll mill and the heating furnace.

[0011] Both ends of the round rod leak out to the outside of the core tube. The end of the round rod facing the heating furnace is fixed with a truncated cone area, a first transition area and a conical head in sequence. The diameter of the large end of the truncated cone area is greater than or equal to the diameter of the inscribed circle of the core tube cross section.

[0012] The output shaft of the driving device is fixed with a connecting shaft, and the connecting shaft is coaxially fixedly connected with one end of the round rod which is away from the through hole.

[0013] Preferably, a partition is provided inside the heating furnace above one end of the lower point of the support frame, the partition separates the inside of the heating furnace into a heat preservation zone, and through holes are provided on two opposite sides of the heat preservation zone.

[0014] The partition is provided with a horizontally arranged long hole, a support seat is provided inside the long hole, a groove is concave on the top surface of the support seat, a sealing plate is fixed at the bottom edge of the support seat, and the sealing plate is located below the partition

[0015] A second screw rod arranged vertically is threadedly connected to the sealing plate, and the bottom of the second screw rod is penetrated into the bottom surface of the heating furnace and is fixed with a pulley.

[0016] A first motor is fixed outside the heating furnace, and a synchronous belt is provided between the output shaft of the first motor and the pulley of the second screw.

[0017] When the support seat moves to the bottom, the steel rod at the bottom supported by the support frame slides into the groove on the top surface of the support seat.

[0018] Preferably, a horizontally arranged pressure plate is provided directly below the support seat, and a baffle is fixed above the end of the pressure plate facing the hump.

[0019] A spring is arranged between the bottom surface of the pressing plate and the bottom surface of the heating furnace, and a pull rope is fixed between the bottom surface of the pressing plate and the bottom surface of the heating furnace.

[0020] Driven by the spring, the pressure plate moves to the highest point, and the baffle prevents the steel rod at the lowest end supported by the support frame from sliding.

[0021] Preferably, the length of the pressing plate is greater than the length of the round rod.

[0022] The two ends of the pressing plate are clamped between the second limiting plates, and the bottom of the second limiting plate is fixedly connected to the bottom surface of the heating furnace.

[0023] Preferably, when the support seat moves to the uppermost end, the groove on the top surface of the support seat is coaxially arranged with the push rod, and a groove is concave on the end surface of the push rod facing the support seat, and the depth of the groove is greater than the length between the conical head and the truncated cone area.

[0024] A discharge port guide cylinder is fixed to the inner side of the through hole used as an outlet by bolts.

[0025] Preferably, two relatively arranged support rods are fixed on the circumferential surface of the push rod located inside the heating furnace, and the end of the support rod is located at the front end of the travel direction of the push rod. A sliding hole is provided at the end of the support rod, and the sliding hole is sleeved on the outside of the connecting rod. A fastening plate is fixed to one end of the connecting rod facing the support seat.

[0026] A first slider is fixed above one end of the connecting rod away from the fastening plate, and a first screw is passed through the first slider.

[0027] The first screw rod is provided with two threaded parts, the spiral directions of the two threaded parts are opposite, and the two threaded parts are respectively threadedly connected with the first sliding blocks on both sides of the support seat.

[0028] A gear is fixed at each end of the first screw rod, and an upper slide rail and a lower slide rail are respectively provided on the upper and lower sides of the gear. The upper slide rail and the lower slide rail are arranged parallel to each other, and the upper slide rail and the lower slide rail are fixedly connected to the inner wall of the insulation area. The length direction of the upper slide rail and the lower slide rail is parallel to the axis of the push rod.

[0029] A rack is provided at one end of the bottom surface of the upper slide rail, and a rack is provided at one end of the top surface of the lower slide rail. The two racks are arranged alternately, and the gear is meshed and connected with the rack.

[0030] Preferably, a fixing sleeve is threadedly connected to the round rod, the fixing sleeve is in the shape of a circular ring, and the outer diameter of the fixing sleeve is smaller than the diameter of the inscribed circle of the core tube cross section.

[0031] A plurality of insertion holes are arranged on the circumferential surface of the fixing sleeve.

[0032] The core tube is located between the fixed sleeve and the truncated cone area.

[0033] Preferably, the driving device includes a motor and a reducer connected to the motor, and the output shaft of the reducer is fixedly connected to the connecting shaft.

[0034] A bottom plate is fixed below the driving device, and the bottom plate is slidably arranged on the foundation.

[0035] The production process of hollow steel for heavy drill rods includes the following steps:

[0036] A. Put the steel rods into the support frame through the rod adding port until a layer of steel rods is laid on the support frame, turn on the heating device to heat the steel rods, and keep them warm after heating to the set temperature;

[0037] B. After the insulation time reaches the preset time, the support seat moves down and presses down the pressure plate, thereby driving the baffle plate to move down, so that the baffle plate releases the obstruction to the steel rod, and the steel rod rolls into the groove on the top surface of the support seat;

[0038] C. The support seat drives the steel rod to move upward and push the steel rod into the insulation zone. The push rod connected to the hydraulic rod pushes the steel rod above the support seat into the guide tube of the discharge port, and then pushes it out from the through hole and contacts the conical head. The driving device drives the round rod to rotate. The steel rod is punched under the joint action of the rotating round rod and the push rod. The diameter of the hole is greater than or equal to the diameter of the inscribed circle of the core tube cross section.

[0039] D. The part of the steel bar with holes punched is moved forward and sleeved on the core tube, and then enters the inside of the six-roll mill. The six-roll mill is rolled. After the rolled steel bar leaves the six-roll mill, it pushes the support block to slide on the support table;

[0040] E. After drilling and rolling a steel rod, a finished heavy-duty drill rod hollow steel tube is formed, and then the connection between the connecting shaft and the round rod is disconnected, and the driving device is slid on the foundation to pull the heavy-duty drill rod hollow steel tube formed after rolling out from the core tube.

[0041] Preferably, when the push rod moves toward the steel rod, the gear is meshed with the rack on the top surface of the lower sliding rail, the rack drives the gear to rotate, and then drives the first screw to rotate, the rotation of the first screw drives the two first sliders to move toward the axial direction of the push rod, and the two fastening plates clamp the steel rod.

[0042] When the push rod moves to the end of the insulation zone, the gear is meshed and connected with the rack on the bottom surface of the upper slide rail, and the two fastening plates release the clamping of the steel rod.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] (1) The punching station for the steel bar is set at the exit of the heating furnace, so there will be no large-scale temperature drop and the hardness of the steel bar will not increase, which is conducive to punching.

[0045] (2) After punching, the part of the steel bar with holes can be rolled, which shortens the time interval between the two processes of punching and rolling, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0047] Figure 1 This is the appearance diagram of the hollow steel production device for heavy drill rods of the present invention.

[0048] Figure 2 This is a top view of a hollow steel production device for heavy drill rods of the present invention.

[0049] Figure 3 This is the appearance diagram of the heating furnace in the hollow steel production device for heavy drill rods of the present invention.

[0050] Figure 4This is a partial cross-sectional view of the outer wall of the heating furnace of the hollow steel production device for heavy drill rods of the present invention.

[0051] Figure 5 This is the first cross-sectional view of the heating furnace in the hollow steel production device for heavy drill rods of the present invention.

[0052] Figure 6 This is the second cross-sectional view of the heating furnace in the hollow steel production device for heavy drill rods of the present invention.

[0053] Figure 7 This is the internal structure diagram of the heating furnace in the production device of hollow steel for heavy drill rods of the present invention.

[0054] Figure 8 This is a structural diagram of the steel bar lifting and extrusion system of the heating furnace in the hollow steel production device for heavy drill rods of the present invention.

[0055] Fig. 9 This is a structural diagram of the heavy-duty hollow steel production device for drill rods after removing the heating furnace.

[0056] Fig.10 This is a partial cross-sectional view of the middle part of the hollow steel production device for heavy drill rods of the present invention.

[0057] Fig.11 This is a structural diagram of the clamping device of the hollow steel production device for heavy drill rods of the present invention.

[0058] Fig.12 This is a bottom view of the clamping device of the hollow steel production device for heavy drill rods of the present invention.

[0059] Fig.13 This is a structural diagram of the support device for the hollow steel production device for heavy drill rods of the present invention.

[0060] Fig.14 This is a cross-sectional view of the rod core of the hollow steel production device for heavy drill rods of the present invention.

[0061] Fig.15 for Fig.14 A partial enlarged view of the middle A.

[0062] Fig.16 for Fig.14 A partial enlarged view of point B in the middle.

[0063] In the figure: 1-heating furnace, 101-insulating zone, 1011-upper cover, 1012-partition, 102-through hole, 103-rod adding port, 104-support frame, 105-first limit plate, 106-second limit plate, 107-heating device, 2-push rod, 201-support rod, 202-groove, 3-fastening plate, 301-connecting rod, 302-first slider, 4-first screw, 401-gear, 501-upper slide rail, 502-lower slide rail, 6-support seat, 7-second screw, 8-synchronous belt, 9-first motor, 10-discharge port guide cylinder, 11-pressing plate, 1101-baffle, 1102-spring, 1103-pull rope, 12-steel rod, 13-six-roll mill, 14-round rod, 1401-conical head, 1402-first transition zone, 1403-conical zone, 1404-second transition zone, 1405-concave ring, 1406-third transition zone, 15-core tube, 16-support platform, 1601-lifting device, 17-support block, 18-connecting shaft, 1801-insert key, 19-drive device, 1901-bottom plate, 20-foundation, 2001-first slide, 21-bracket, 2101-second slide, 22-platform, 2201-insert block, 2202-third slide, 23-clamp, 2301-convex strip, 2302-fixed rod, 24-second slider, 25-second motor, 2501-third screw, 26-fixed sleeve, 2601-jack, 27-bearing, 28-electric cylinder, 29-position sensor. DETAILED DESCRIPTION

[0064] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0065] In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] The following is a further detailed description of the production process and production device of the hollow steel for heavy drill rods of the present invention in conjunction with the accompanying drawings, but it is not intended to limit the present invention.

[0068] The hollow steel production device for heavy drill rods comprises a six-roll rolling mill 13, a heating furnace 1, a push rod 2, a round bar 14, a core tube 15, a supporting device and a driving device 19.

[0069] One end of the push rod 2 facing away from the heating furnace 1 is fixedly connected to a hydraulic rod with a telescopic function driven by a hydraulic pressure, and the hydraulic rod adopts the existing technology.

[0070] An inclined support frame 104 is provided inside the heating furnace 1 , and a heating device 107 is provided below the support frame 104 . The heating device 107 adopts the existing technology and can be a heating sheet, a heating plate or other heating equipment.

[0071] The support frame 104 includes L-shaped plates on both sides and a vertical plate located at the high end of the support frame 104. The two ends of the vertical plate are fixedly connected to the ends of the L-shaped plate, and the bottom of the L-shaped plate is fixedly connected to the bottom surface of the heating furnace 1 through a column. A layer of steel rods 12 is laid on the support frame 104, and the two ends of the steel rods 12 are in contact with the vertical surface and the bottom surface of the L-shaped plate respectively.

[0072] A rod adding opening 103 is provided on the top surface of the heating furnace 1 just above the highest point of the support frame 104. The top of the vertical plate of the support frame 104 is extended to the rod adding opening 103. A sealing plate is provided above the outside of the rod adding opening 103. The sealing plate is hinged or slidably connected to the top surface of the heating furnace 1.

[0073] In order to further guide and limit the steel rod 12, a first limiting plate 105 is provided above the support frame 104. The first limiting plate 105 is fixedly connected to the top surface of the inner cavity of the heating furnace 1. The first limiting plate 105 includes an inclined plate and a vertical plate fixedly connected to each other. The inclined plate has the same inclination as the L-shaped plate. The inclined plate is located above the steel rod 12. The spacing between the vertical plate of the first limiting plate 105 and the vertical plate of the support frame 104 is the same as the diameter of the steel rod 12.

[0074] A partition 1012 is provided inside the heating furnace 1 above the lower end of the support frame 104, and the partition 1012 separates the heating furnace 1 into a heat preservation zone 101. In this embodiment, the heat preservation zone 101 can be protruded above the top surface of the heating furnace 1, and the partition 1012 is flush with the top surface of the heating furnace 1.

[0075] The through holes 102 are arranged on the side surfaces at both ends of the insulation zone 101 in the length direction, one for discharging materials and the other for passing the push rod 2.

[0076] The partition plate 1012 is provided with horizontally arranged long holes, and a support seat 6 is provided inside the long hole. When the support seat 6 is located inside the long hole, the long hole can be blocked, so that the insulation area 101 is isolated from the interior of the heating furnace 1. The top surface of the insulation area 101 is provided with an opening to facilitate maintenance inside the insulation area 101, and an upper cover 1011 is provided at the opening.

[0077] The top surface of the support seat 6 is concave with a groove, the arc of the groove is 180°, and the inner diameter of the groove is the same as the outer diameter of the steel rod 12. A sealing plate is fixed at the bottom edge of the support seat 6, and the sealing plate is always located below the partition 1012.

[0078] The sealing plate is threadedly connected with at least two vertically arranged second screws 7, the bottom of which penetrates into the bottom surface of the heating furnace 1 and is fixed with a pulley. This embodiment uses two second screws 7, which are respectively located on both sides of the sealing plate.

[0079] A first motor 9 is fixed outside the heating furnace 1, and a synchronous belt 8 is sleeved between the output shaft of the first motor 9 and the pulley of the second screw 7. The first motor 9 drives the second screw 7 to rotate through the synchronous belt 8, thereby driving the support seat 6 to move up and down.

[0080] When the support seat 6 moves to the uppermost end, the groove on the top surface of the support seat 6 is coaxially arranged with the push rod 2. The end surface of the push rod 2 facing the support seat 6 is concave with a groove 202. The depth of the groove 202 is greater than the length between the conical head 1401 and the truncated cone area 1403. The inner side of the through hole 102 serving as an outlet is fixed with a discharge guide cylinder 10 by bolts.

[0081] Two relatively arranged support rods 201 are fixed on the circumferential surface of the push rod 2 located inside the heating furnace 1. The end of the support rod 201 is located at the front end of the travel direction of the push rod 2. A sliding hole is provided at the end of the support rod 201. The sliding hole is sleeved on the outside of the connecting rod 301. A fastening plate 3 is fixed on one end of the connecting rod 301 facing the support seat 6.

[0082] A first sliding block 302 is fixed above one end of the connecting rod 301 away from the fastening plate 3 , and a first screw rod 4 is passed through the first sliding block 302 .

[0083] The first screw rod 4 is provided with two threaded parts, the spiral directions of the two threaded parts are opposite, and the two threaded parts are respectively threadedly connected to the first sliding blocks 302 on both sides of the support seat 6.

[0084] A gear 401 is fixed at each end of the first screw rod 4, and an upper slide rail 501 and a lower slide rail 502 are respectively provided on the upper and lower sides of the gear 401. The upper slide rail 501 and the lower slide rail 502 are arranged parallel to each other, and the upper slide rail 501 and the lower slide rail 502 are fixedly connected to the inner wall of the insulation zone 101, and the length direction of the upper slide rail 501 and the lower slide rail 502 is parallel to the axis of the push rod 2.

[0085] A rack is provided at one end of the bottom surface of the upper slide rail 501 , and a rack is provided at one end of the top surface of the lower slide rail 502 . The two racks are arranged alternately, and the gear 401 is meshed and connected with the racks.

[0086] When the support seat 6 moves to the bottom, the steel rod 12 at the bottom supported by the support frame 104 slides into the groove on the top surface of the support seat 6 .

[0087] In order to prevent the steel rod 12 on the support frame 104 from rolling to the bottom of the heating furnace 1 without any obstacles when the support seat 6 is not moved to the bottom. In this embodiment, a horizontally arranged pressing plate 11 is provided directly below the support seat 6, and a baffle 1101 is fixed above one end of the pressing plate 11 facing the support frame 104.

[0088] A spring 1102 is provided between the bottom surface of the pressing plate 11 and the bottom surface of the heating furnace 1 , and a pull rope 1103 is fixed between the bottom surface of the pressing plate 11 and the bottom surface of the heating furnace 1 .

[0089] Pushed by the spring 1102 , the pressure plate 11 moves to the highest point, and the baffle 1101 blocks the steel rod 12 at the bottom supported by the support frame 104 from sliding.

[0090] The length of the pressing plate 11 is greater than that of the steel rod 12, and both ends of the pressing plate 11 are clamped between the second limiting plates 106, that is, a second limiting plate 106 is respectively provided on both sides of one end of the pressing plate 11, and the pressing plate 11 slides up and down between the two second limiting plates 106, and the bottom of the second limiting plate 106 is fixedly connected to the bottom surface of the heating furnace 1.

[0091] The support device includes a support platform 16 and at least two support blocks 17. Two clamping plates are fixed on the upper sides of the width direction of the top surface of the support platform 16. The support block 17 is located between the two clamping plates. The support block 17 is slidably arranged on the support platform 16. In this embodiment, two support blocks 17 are arranged on the support platform 16. A lifting device 1601 is arranged at one end of the support platform 16 away from the six-roller rolling mill 13. The lifting device 1601 is a prior art. The top platform of the lifting device 1601 is flush with the top surface of the support platform 16. One support block 17 slides freely on the top surface of the support platform 16. The other support block 17 is fixedly connected to the top platform of the lifting device 1601 by bolts. The freely sliding support block 17 can completely slide into the lifting device 1601.

[0092] The support block 17 supports the core tube 15 , which has a hexagonal cross-section with a circular through hole in the middle. The top surface of the support block 17 is concave with a groove, and the core tube 15 is stuck in the groove, so the core tube 15 cannot rotate.

[0093] The six-roller rolling mill 13 is disposed between the supporting device and the heating furnace 1 , and the rolling hole in the middle of the six-roller rolling mill 13 is coaxially arranged with the through hole 102 .

[0094] A round rod 14 is passed through the middle of the core tube 15 , and the round rod 14 is coaxially arranged with the through hole 102 . One end of the core tube 15 passes through the rolling hole of the six-roller rolling mill 13 and is placed between the six-roller rolling mill 13 and the heating furnace 1 .

[0095] Both ends of the round rod 14 leak out to the outside of the core tube 15. The third transition zone 1406, the second transition zone 1404, the truncated cone zone 1403, the first transition zone 1402 and the conical head 1401 are fixed in sequence on the end of the round rod 14 facing the heating furnace 1. The diameter of the large end of the truncated cone zone 1403 is greater than or equal to the diameter of the inscribed circle of the cross section of the core tube 15. The first transition zone 1402 and the second transition zone 1404 are both cylindrical. The outer diameter of the first transition zone 1402 is the same as the diameter of the small end of the truncated cone zone 1403, and the outer diameter of the second transition zone 1404 is the same as the diameter of the large end of the truncated cone zone 1403.

[0096] Since the end of the round rod 14 facing the steel rod 12 is used to punch holes in the steel rod 12, a conical head 1401 is provided. The conical head 1401 punches holes in the steel rod 12. However, if the holes inside the steel rod 12 are punched to a specified value at one time, a greater driving force is required, so a larger hydraulic press needs to be purchased, which increases the cost. Therefore, in order to reduce the cost and reduce the demand for the thrust of the push rod 2, the present embodiment is divided into at least two stages to punch holes in the steel rod 12, that is, the first stage is to punch holes through the conical head 1401, and then to transition through the first transition area 1402. After the transition is stable, the hole is expanded through the truncated cone area 1403 to expand the hole to the specified size. After the hole is expanded, the transition is made through the second transition area 1404.

[0097] Finally, the third transition zone 1406 is used for final shaping and correction so that the hole size inside the steel bar 12 completely meets the rolling requirements, and then the steel bar 12 is moved and sleeved on the core tube 15 and enters the six-high rolling mill 13 for rolling.

[0098] In order to further reduce the requirement on the thrust of the push rod 2 and make the punching smoother, in this embodiment, the round rod 14 is driven to rotate by the driving device 19 during the punching process.

[0099] The driving device 19 includes a motor and a reducer connected to the motor. The output shaft of the reducer is fixedly connected to the connecting shaft 18. A base plate 1901 is fixed below the driving device 19. The base plate 1901 is set on the foundation 20. The foundation 20 is provided with a first slideway 2001. The base plate 1901 is slidably set on the foundation 20, and the sliding direction is perpendicular to the axis of the steel rod 12.

[0100] The connecting shaft 18 is coaxially fixedly connected to the end of the round rod 14 away from the through hole 102. The fixed connection method can be a flange bolt fixed connection, but this connection method is slow to disassemble and the coaxiality needs to be adjusted each time it is installed.

[0101] In this embodiment, a slot with a rectangular cross-section is concavely formed on the end surface of the round rod 14 facing the connecting shaft 18, and a key 1801 is convexly provided on the end surface of the connecting shaft 18 facing the round rod 14. The shape of the key 1801 is the same as that of the slot, and the key 1801 is inserted into the inside of the slot.

[0102] The round rod 14 is threadedly connected with a fixing sleeve 26, which is in the shape of a ring. The outer diameter of the fixing sleeve 26 is smaller than the diameter of the inscribed circle of the cross section of the core tube 15. A plurality of insertion holes 2601 are arranged on the circumferential surface of the fixing sleeve 26. The core tube 15 is located between the fixing sleeve 26 and the truncated cone area 1403.

[0103] Since the round rod 14 rotates during use, but the core tube 15 does not rotate, a bearing 27 is provided between the core tube 15 and the fixing sleeve 26 and the third transition zone 1406 .

[0104] A bracket 21 is provided between the six-roller rolling mill 13 and the heating furnace 1. A second slideway 2101 is recessed in the top surface of the bracket 21. A platform 22 is provided above the bracket 21. An insert block 2201 is provided at the bottom of the platform 22. The insert block 2201 is slidably arranged inside the second slide 2101. An electric cylinder 28 is fixed to the bracket 21. The axis of the telescopic rod of the electric cylinder 28 is parallel to the axis of the through hole 102. The end of the telescopic rod of the electric cylinder 28 is fixedly connected to the platform 22.

[0105] Two third slideways 2202 arranged opposite to each other are provided on the platform 22, and a second slider 24 is slidably provided inside the third slideway 2202. A third screw rod 2501 threadedly connected to the second slider 24 is penetrated in the area below the third slideway 2202, and a fixing rod 2302 is provided at one end of the second slider 24 located above the third slideway 2202 and facing the center of the platform 22, and an arc-shaped clamping plate 23 is fixed at the end of the fixing rod 2302, and the arc of the clamping plate 23 is 90° to 180°, and the inner diameter of the clamping plate 23 is the same as the outer diameter of the steel rod 12, and a convex strip 2301 is convexly provided on the inner side of the clamping plate 23.

[0106] The second transition area 1404 is concavely provided with a concave ring 1405. When the two clamping plates 23 move toward the center and tighten the second transition area 1404, the convex strip 2301 is inserted into the concave ring 1405. Then the electric cylinder 28 pushes the platform 22 toward the heating furnace 1, thereby separating the round rod 14 from the connecting shaft 18. At the same time, the two clamping plates 23 can keep the round rod 14 stable and prevent it from tilting.

[0107] Then the driving device 19 is moved, and the lifting device 1601 drives the two support blocks 17 to move downward, so that the support blocks 17 also contact the obstruction of the rolled steel rod 12, and the steel rod 12 can be pulled out from the core tube 15.

[0108] The third screw rod 2501 is provided with two threaded parts, the spiral directions of the two threaded parts are opposite, and the two threaded parts are respectively threadedly connected to the two second sliders 24 . One end of the third screw rod 2501 is connected to the second motor 25 , and the second motor 25 is fixedly connected to the platform 22 .

[0109] A position sensor 29 is provided on the top surface of the platform 22. The position sensor 29 can be an ultrasonic sensor. When the steel rod 12 is squeezed and rolled and the concave ring 1405 is exposed again, the position sensor 29 can detect information. At this time, the control cabinet controls the second motor 25 to rotate, and the clamping plate 23 clamps the second transition zone 1404.

[0110] The position sensor 29 can also adopt a photoelectric counter-radiation sensor, in which the transmitting end is arranged above the concave ring 1404 and is fixedly connected to the bracket 21 and remains stationary, and the receiving end is located below the concave ring 1404 and fixed on the platform 22. The emitted light is located on one side inside the concave ring 1404. When there is a steel rod 12 on the concave ring 1404, the emitted light will not be received by the receiving end. When the steel rod 12 leaves the concave ring 1404, the emitted light can be received.

[0111] The production device for hollow steel for heavy drill rods also includes an electric control cabinet, which is a prior art. All electrical components contained in the production device for hollow steel for heavy drill rods are electrically connected to the electric control cabinet.

[0112] The production process of hollow steel for heavy drill rods includes the following steps:

[0113] A. Put the steel rods 12 into the support frame 104 through the rod adding port 103 until a layer of steel rods 12 is laid on the support frame 104, turn on the heating device 107 to heat the steel rods 12, and keep them warm after heating to the set temperature;

[0114] B. After the heat preservation time reaches the predetermined time, the support seat 6 moves downward and presses down the pressing plate 11, thereby driving the baffle 1101 to move downward, so that the baffle 1101 releases the obstruction of the steel rod 12, and the steel rod 12 rolls into the groove on the top surface of the support seat 6;

[0115] C. The support seat 6 drives the steel rod 12 to move upward and push the steel rod 12 into the insulation zone 101. The push rod 2 connected to the hydraulic rod pushes the steel rod 12 above the support seat 6 to insert into the discharge port guide cylinder 10, and then pushes it out from the through hole 102 and contacts the conical head 1401. The driving device 19 drives the round rod 14 to rotate. Under the joint action of the rotating round rod 14 and the push rod 2, the steel rod 12 is punched, and the diameter of the hole is greater than or equal to the diameter of the inscribed circle of the cross section of the core tube 15;

[0116] D. The part of the steel bar 12 with holes punched is moved forward and sleeved on the core tube 15, and then enters the inside of the six-roller rolling mill 13, and the six-roller rolling mill 13 performs rolling. After the rolled steel bar 12 leaves the six-roller rolling mill 13, it pushes the support block 17 to slide on the support table 16;

[0117] E. After drilling and rolling a steel rod 12, a finished heavy-duty hollow steel tube for a drill rod is formed, and then the connection between the connecting shaft 18 and the round rod 14 is disconnected, and the driving device 19 is slid on the foundation 20 to pull the heavy-duty hollow steel tube for a drill rod formed after rolling out from the core tube 15.

[0118] When the push rod 2 moves toward the steel rod 12, the gear 401 meshes with the rack on the top surface of the lower slide rail 502, and the rack drives the gear 401 to rotate, thereby driving the first screw 4 to rotate. The rotation of the first screw 4 drives the two first sliders 302 to move toward the axis direction of the push rod 2, and the two fastening plates 3 clamp the steel rod 12. After the steel rod 12 is tightened, the rotation of the round rod 14 will not drive the steel rod 12 to rotate.

[0119] When the push rod 2 moves to the end of the heat preservation zone 101 , the gear 401 is meshed and connected with the rack on the bottom surface of the upper slide rail 501 , and the two fastening plates 3 release the clamping of the steel rod 12 .

[0120] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A production device for hollow steel for heavy drill rods, comprising a six-roll rolling mill (13), characterized in that: It also includes a heating furnace (1), a push rod (2), a round rod (14), a core tube (15), a supporting device and a driving device (19). A support frame (104) arranged obliquely is provided inside the heating furnace (1), a heating device (107) is provided below the support frame (104), a rod adding opening is provided on the top surface of the heating furnace (1) directly above the highest point of the support frame (104), a through hole (102) is provided on the outer wall of the heating furnace (1) on both sides of the lower point of the support frame (104), and a push rod (2) is inserted into the interior of the heating furnace (1) through a through hole (102). The support device comprises a support platform (16) and at least two support blocks (17), wherein the support blocks (17) are slidably arranged on the support platform (16). The six-roller rolling mill (13) is arranged between the support device and the heating furnace (1), and the rolling hole in the middle of the six-roller rolling mill (13) is coaxially arranged with the through hole (102). A core tube (15) is supported on the support block (17), a round rod (14) is passed through the middle of the core tube (15), the round rod (14) and the through hole (102) are coaxially arranged, and one end of the core tube (15) passes through the rolling hole of the six-roller rolling mill (13) and is placed between the six-roller rolling mill (13) and the heating furnace (1). Both ends of the round rod (14) are leaking to the outside of the core tube (15); a truncated cone area (1403), a first transition area (1402) and a conical head (1401) are fixed in sequence on the end of the round rod (14) facing the heating furnace (1); the diameter of the large end of the truncated cone area (1403) is greater than or equal to the diameter of the inscribed circle of the cross section of the core tube (15); The output shaft of the driving device (19) is fixed with a connecting shaft (18), and the connecting shaft (18) is coaxially fixedly connected to an end of the round rod (14) that is away from the through hole (102).

2. The hollow steel production device for heavy drill rods according to claim 1 is characterized in that: A partition (1012) is provided inside the heating furnace (1) above the lower end of the support frame (104), and the partition (1012) separates the inside of the heating furnace (1) into a heat preservation zone (101). The through holes (102) are provided on two opposite sides of the heat preservation zone (101). The partition (1012) is provided with a horizontally arranged long strip hole, a support seat (6) is provided inside the long strip hole, a groove is concave on the top surface of the support seat (6), a sealing plate is fixed at the bottom edge of the support seat (6), and the sealing plate is located below the partition (1012). A second screw rod (7) arranged vertically is threadedly connected to the sealing plate. The bottom of the second screw rod (7) is inserted into the bottom surface of the heating furnace (1) and is fixed with a pulley. A first motor (9) is fixed outside the heating furnace (1), and a synchronous belt (8) is sleeved between the output shaft of the first motor (9) and the pulley of the second screw rod (7). When the support seat (6) moves to the bottom, the steel rod (12) at the bottom end supported by the support frame (104) slides into the groove on the top surface of the support seat (6).

3. The hollow steel production device for heavy drill rods according to claim 2 is characterized in that: A horizontally arranged pressing plate (11) is provided directly below the support seat (6), and a baffle (1101) is fixed above one end of the pressing plate (11) facing the support frame (104). A spring (1102) is provided between the bottom surface of the pressing plate (11) and the bottom surface of the heating furnace (1), and a pull rope (1103) is fixed between the bottom surface of the pressing plate (11) and the bottom surface of the heating furnace (1). Under the push of the spring (1102), the pressure plate (11) moves to the highest point, and the baffle (1101) blocks the sliding of the steel rod (12) at the lowest end supported by the support frame (104).

4. The hollow steel production device for heavy drill rods according to claim 3 is characterized in that: The length of the pressing plate (11) is greater than the length of the steel rod (12). The two ends of the pressing plate (11) are clamped between the second limiting plates (106), and the bottom of the second limiting plates (106) is fixedly connected to the bottom surface of the heating furnace (1).

5. The hollow steel production device for heavy drill rods according to claim 4 is characterized in that: When the support seat (6) moves to the uppermost end, the groove on the top surface of the support seat (6) is coaxially arranged with the push rod (2), and a groove (202) is concavely formed on the end surface of the push rod (2) facing the support seat (6), and the depth of the groove (202) is greater than the length between the conical head (1401) and the truncated cone area (1403). A discharge port guide cylinder (10) is fixed to the inner side of the through hole (102) serving as an outlet via bolts.

6. The hollow steel production device for heavy drill rods according to claim 5, characterized in that: Two supporting rods (201) arranged opposite to each other are fixed on the circumferential surface of the push rod (2) located inside the heating furnace (1). The ends of the supporting rods (201) are located at the front end of the moving direction of the push rod (2). The ends of the supporting rods (201) are provided with sliding holes, which are sleeved on the outside of the connecting rod (301). A fastening plate (3) is fixed to one end of the connecting rod (301) facing the support seat (6). A first sliding block (302) is fixed above one end of the connecting rod (301) that is away from the fastening plate (3), and a first screw rod (4) is passed through the first sliding block (302). The first screw rod (4) is provided with two threaded parts, the spiral directions of the two threaded parts are opposite, and the two threaded parts are respectively threadedly connected to the first sliders (302) on both sides of the support seat (6). A gear (401) is fixed at each end of the first screw rod (4), and an upper slide rail (501) and a lower slide rail (502) are provided on the upper and lower sides of the gear (401), respectively. The upper slide rail (501) and the lower slide rail (502) are arranged parallel to each other, and the upper slide rail (501) and the lower slide rail (502) are fixedly connected to the inner wall of the heat preservation zone (101). The length direction of the upper slide rail (501) and the lower slide rail (502) are parallel to the axis of the push rod (2). A rack is provided at one end of the bottom surface of the upper slide rail (501), and a rack is provided at one end of the top surface of the lower slide rail (502). The two racks are arranged alternately, and the gear (401) is meshedly connected with the racks.

7. The device for producing hollow steel for heavy drill rod according to claim 6, characterized in that: The round rod (14) is threadedly connected with a fixing sleeve (26), which is in the shape of a circular ring. The outer diameter of the fixing sleeve (26) is smaller than the diameter of the inscribed circle of the cross section of the core tube (15). The fixed sleeve (26) is provided with a plurality of insertion holes (2601) on its circumferential surface. The core tube (15) is located between the fixed sleeve (26) and the truncated cone area (1403).

8. The device for producing hollow steel for heavy drill rod according to claim 1, 2, 3, 4, 6 or 7, characterized in that: The driving device (19) comprises a motor and a reducer connected to the motor, wherein the output shaft of the reducer is fixedly connected to the connecting shaft (18). A bottom plate (1901) is fixed below the driving device (19), and the bottom plate (1901) is slidably disposed on the foundation (20).

9. The process for producing hollow steel for heavy drill rods according to the hollow steel production device for heavy drill rods according to claim 5, characterized in that: The following steps are involved: A. placing the steel rods (12) onto the support frame (104) through the rod loading port (103) until a layer of steel rods (12) is laid on the support frame (104), and turning on the heating device (107) to heat the steel rods (12). After the steel rods (12) are heated to a set temperature, the steel rods (12) are kept warm; B. After the heat preservation time reaches a predetermined time, the support seat (6) moves downward and presses the pressing plate (11), thereby driving the baffle plate (1101) to move downward, so that the baffle plate (1101) releases the obstruction to the steel rod (12), and the steel rod (12) rolls into the groove on the top surface of the support seat (6); C. The support seat (6) drives the steel rod (12) to move upward and push the steel rod (12) into the heat preservation zone (101). The push rod (2) connected to the hydraulic rod pushes the steel rod (12) above the support seat (6) to be inserted into the discharge port guide tube (10), and then is pushed out from the through hole (102) and contacts the conical head (1401). The driving device (19) drives the round rod (14) to rotate. Under the joint action of the rotating round rod (14) and the push rod (2), the steel rod (12) is punched, and the diameter of the hole is greater than or equal to the diameter of the inscribed circle of the cross section of the core tube (15); D. The portion of the steel bar (12) with the hole punched therein is moved forward and sleeved on the core tube (15), and then enters the interior of the six-roller rolling mill (13), and the six-roller rolling mill (13) performs rolling. After the rolled steel bar (12) leaves the six-roller rolling mill (13), it pushes the support block (17) to slide on the support table (16); E. After drilling and rolling a steel rod (12), a finished heavy-duty hollow steel tube for a drill rod is formed. Then, the connection between the connecting shaft (18) and the round rod (14) is disconnected, and the driving device (19) is slid on the foundation (20) to pull the rolled heavy-duty hollow steel tube for a drill rod out of the core tube (15).

10. The production process of hollow steel for heavy drill rod according to claim 9, characterized in that: When the push rod (2) moves toward the steel rod (12), the gear (401) meshes with the rack on the top surface of the lower slide rail (502), and the rack drives the gear (401) to rotate, thereby driving the first screw rod (4) to rotate. The rotation of the first screw rod (4) drives the two first sliders (302) to move toward the axis direction of the push rod (2), and the two fastening plates (3) clamp the steel rod (12). When the push rod (2) moves to the end of the heat preservation zone (101), the gear (401) is meshed with the rack on the bottom surface of the upper slide rail (501), and the two fastening plates (3) release the clamping of the steel rod (12).

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