Four-station centrifugal machine for producing thin-walled tube

Abstract

The utility model discloses a four-station centrifugal machine for producing a thin-walled tube. Four stations are a cleaning station, a spraying station, a pouring station and a tube pushing station which are arranged in sequence. The pipe die stepping device is arranged between the riding wheel sets, stepping beams are arranged on the two sides of the stepping frame, V-shaped supporting blocks are fixed to the top faces of the stepping beams, and the bottom faces of the stepping beams are supported and matched through grooved wheels at the tops of the lifting cylinders. The stepping cylinder is installed on the stepping frame, and the lower portion of the stepping cylinder is connected with the lifting cylinder. The lifting cylinder lifts the stepping frame and the stepping cylinder at the same time, and the stroke of the lifting cylinder is larger than the vertical distance between the lowest point of the pipe die rolling belt and the topmost end of the riding wheel. When the stepping frame is located at the lowest position, the top end of the supporting block is lower than the lowest point of the pipe die. The heat preservation furnace is arranged on the trolley of the pouring device, the heat preservation furnace is only supported by the weighing device when bearing molten steel, quantitative pouring is achieved, and the pouring device is suitable for batch centrifugal production of thin-walled pipes in the aspects of production rhythm and wall thickness consistency.

Description

TECHNICAL FIELD

[0001] The utility model is applied to centrifugal casting field relates to thin -walled pipe production uses centrifuge, specifically is four station continuous production's centrifuge. BACKGROUND

[0002] The centrifuge for centrifugal casting steel pipe mostly adopts single station or double station, the single station centrifuge carries out pipe mould cleaning, coating spraying, centrifugal casting, cooling and pipe drawing operation in one station, and the production efficiency is low.Double station centrifuge sets up pipe mould cleaning, coating spraying and cooling and pipe drawing in one station, and the station supporting wheel rotates slowly, and sets up centrifugal casting in one station, and the station supporting wheel rotates fast.For thin -walled pipe, because the wall is thin, the amount of molten steel is less, and the cooling is fast, therefore, double station can not guarantee the matching of production rhythm, and multiple stations are needed to match the production rhythm and improve the production efficiency.

[0003] CN103878337B multi -station hot mould method centrifuge production system discloses a three -station centrifuge, and the middle is pouring station, and both sides are spraying station, and uses two pipe moulds and two pipe mould transport cars.An additional spraying station is added to adapt to the rhythm of pouring and cooling, and the production efficiency is improved.CN216780267U three -station steel pipe centrifuge also discloses a three -station steel pipe centrifuge, which comprises a spraying station, a pouring station and a pipe pushing and cleaning station, and the spraying station is divided into a pipe pushing and cleaning station and a spraying station, and the pipe mould spraying, centrifugal casting and coating cleaning are carried out synchronously.The above-mentioned patent technical scheme adopts pipe mould trolley to transfer pipe mould, and only one pipe can be transferred each time, and it can not adapt to the fast rhythm of thin -walled pipe centrifugal casting.

[0004] In addition, the quantitative pouring of thin -walled pipe ensures the consistency of wall thickness, which is also a difficult problem in thin -walled pipe production, and the lag of digital display of electronic scale restricts the process parameters such as molten steel pouring speed and pouring temperature, and it is difficult to form long thin -walled pipe. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem that a four -station centrifuge for producing thin -walled pipe is provided, three pipe moulds are stepped once, the fast rhythm requirement of batch production of thin -walled pipe centrifugal casting is met, quantitative pouring can also be carried out, and the consistency of thin -walled pipe wall thickness is ensured.

[0006] The utility model adopts the technical scheme: the utility model production thin -walled pipe four position centrifuge each position all sets up the supporting wheel device, and the position interval is consistent. The four positions are the cleaning position, the spraying position, the pouring position and the pushing pipe position which are arranged in sequence. The pipe mould stepping device is arranged between the driving supporting wheel group and the driven supporting wheel group of the supporting wheel device, and the pipe mould stepping device comprises a stepping frame, a stepping cylinder and a lifting cylinder. The two sides of the stepping frame are stepping beams, the top surface of the stepping beam is fixed with a V-shaped supporting block, the position of the supporting block corresponds to the position of the centrifuge. The bottom surface of the stepping beam is supported and matched by a grooved wheel, and the grooved wheel is located at the top of the lifting cylinder. The stepping cylinder is installed at the end or the lower part of the stepping frame and can translate the stepping frame. The stroke of the lifting cylinder is greater than the vertical distance between the lowest point of the pipe mould rolling belt and the top end of the supporting wheel, so that the pipe mould can be stepped over the supporting wheel. When the stepping frame is located at the lowest position, the top end of the supporting block is lower than the lowest point of the pipe mould, so that the pipe mould does not hinder the stepping frame when the stepping frame returns.

[0007] Further, the lifting cylinder is fixedly installed on the fixed frame, the fixed frame is provided with a guide mechanism, the guide mechanism is matched with a guide rod and a guide sleeve, and the guide mechanism is lifted at the same time with the lifting cylinder, so as to stabilize and protect the cylinder rod of the lifting cylinder.

[0008] Further, a guide rail can also be fixed on the bottom surface of the stepping beam, and the guide rail is supported and matched by a grooved wheel. The guide rail is a right-angle steel guide rail, and the grooved wheel is processed with a right-angle groove, so that the guiding is more accurate when the stepping frame moves horizontally.

[0009] Further, the pipe mould at one end of the pouring position is provided with a pouring device, and the pouring device can also be arranged at both ends of the pipe mould if the bimetallic thin-walled pipe is poured.

[0010] Further, the pouring device comprises a trolley, a holding furnace and a runner package which are installed on the trolley. A parallel cylinder is arranged at the bottom of the trolley, one end of the parallel cylinder is connected with the trolley, and the other end is fixed, so as to move and fix the trolley. The runner package is located at the front of the trolley, and the holding furnace is arranged at the rear of the runner package. Supports with circular arc grooves at the top are fixed at both sides of the rear of the runner package, the circular arc grooves are matched with furnace nozzle shafts of the holding furnace, the furnace nozzle shafts are supported by the circular arc grooves and can rotate in the circular arc grooves. The bottom of the holding furnace is supported by a weighter fixed on the trolley, and a tilting cylinder and a force receiving shaft which are matched with each other are arranged at both sides of the holding furnace, the bottom end of the tilting cylinder is hinged with the trolley, the upper end of the circular ring is sleeved with the force receiving shaft in a sleeving mode, and the force receiving shaft is fixed on the holding furnace. When the holding furnace receives molten steel, only the weighter supports and contacts the holding furnace, the furnace nozzle shaft does not contact the circular arc groove, and the force receiving shaft does not contact the circular ring.

[0011] Further, the inside of the runner package is a horn pouring gate with a circular arc transition on the inner surface, so as to reduce the flow resistance of the poured molten steel.

[0012] Further, the push tube station is provided with a push tube device and a tube connecting device respectively arranged at both ends of the tube mold.

[0013] Further, the spraying station is provided with a spraying device at one end of the tube mold, and the cleaning station is provided with a dust removal cover at one end of the tube mold.

[0014] The beneficial effects of the utility model are as follows: the utility model adopts a stepping frame to simultaneously step and move three tube molds, thereby strengthening the matching of the production rhythm of each station and adapting to the fast rhythm of thin-walled tube centrifugal casting. The weighter guarantees the weight of molten steel in the holding furnace, the temperature rise guarantees the pouring temperature, and the holding furnace can realize quantitative pouring, thereby guaranteeing the consistency of the thickness size of the thin-walled tube. The utility model is suitable for batch centrifugal production of thin-walled tubes in terms of production rhythm and wall thickness size consistency. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a plan layout of the utility model;

[0016] Figure 2 It is Figure 1 the left view of the pouring device;

[0017] Figure 3 It is Figure 1 the top view of the tube mold stepping device;

[0018] Figure 4 It is the front view of the tube mold stepping device and also Figure 3 the B-B sectional view schematic diagram of the utility model;

[0019] Figure 5 It is the schematic diagram of another cooperation scheme of the stepping beam and the groove wheel;

[0020] Figure 6 It is the schematic diagram of another setting scheme of the stepping cylinder;

[0021] Figure 7 It is the schematic diagram of another arrangement scheme of the fixing frame;

[0022] Among them: 1 - cleaning station, 2 - spraying station, 3 - pouring station, 4 - push tube station, 5 - spraying device, 6 - push tube device, 7 - tube connecting device, 8 - pouring device, 9 - dust removal cover, 10 - tube mold stepping device, 11 - supporting wheel device, 12 - tube mold;

[0023] 81 - trolley, 82 - parallel cylinder, 83 - weighter, 84 - tilting furnace cylinder, 85 - holding furnace, 86 - stress shaft, 87 - furnace nozzle shaft, 88 - support, 89 - horn gate, 90 - flow nozzle;

[0024] 101 - step beam, 102 - support block, 103 - step cylinder, 104 - groove wheel, 105 - lifting cylinder, 106 - guide rail, 107 - guide mechanism, 108 - fixed frame. DETAILED DESCRIPTION

[0025] In the utility model, the bought parts and the structures not specifically described, such as spraying device, pushing pipe device, connecting pipe device, supporting wheel device, dust hood and the like, all belong to prior art. The following "axial direction" is the rotating axis direction of pipe mould, the two sides of the following step frame are the centrifuge axis direction, and the two ends of the step frame are the direction perpendicular to the axis.

[0026] The layout drawing of the four-station centrifuge of the utility model is shown in the accompanying Figure 1 As shown, it comprises sequentially arranged cleaning station 1, spraying station 2, pouring station 3 and pushing pipe station 4, and the four stations have consistent spacing. Each station is provided with supporting wheel device 11 for rotating pipe mould 12. Cleaning station 1 receives high-temperature pipe mould from heating furnace or pushing pipe station 4, and after cleaning the inner surface of the pipe mould, enters spraying station 2. Spraying station 2 is used for coating spraying, and the coating helps to reduce the thermal stress of the pipe mould and improve the service life of the pipe mould. Pouring station 3 is used for pouring molten steel into the pipe mould, and under the action of centrifugal force, the pipe mould is formed, and after cooling and solidification, it is a thin-walled pipe. Pushing pipe station 4 is used for pushing the thin-walled pipe out of the pipe mould. The supporting wheel devices of the cleaning station, the spraying station and the pushing pipe station can meet the slow rotation of the pipe mould, and the supporting wheel device of the pouring station needs to meet the high-speed rotation requirement of pouring centrifuge.

[0027] At one end of the pipe mould in the cleaning station, dust hood 9 for dust removal is arranged, and dust hood 9 is communicated with dust collector through dust removal pipeline. When the inner surface of the pipe mould is cleaned, the moving wire brush cleans the residual coating or attached impurities on the inner surface of the rotating pipe mould, and the dust is sucked into the dust collector through the dust hood and the dust removal pipeline, avoiding workshop dust pollution.

[0028] At one end of the pipe mould in the spraying station, spraying device 5 for coating spraying is arranged. Spraying device 5 comprises coating tank, spraying rod, spray head and compressed air. When the coating is sprayed, the coating in the coating tank is sprayed on the inner surface of the rotating pipe mould under the pressure of compressed air through the axially advancing spraying rod and the spray head, forming a uniform coating.

[0029] At one end of the pipe mould in the pouring station, pouring device 8 is arranged. The structure of the pouring device is shown in the accompanying Figure 2As shown, the system includes a trolley 81, a holding furnace 85 mounted on the trolley, and a sprue. A parallel cylinder 82 is installed at the bottom of the trolley 81, with one end fixedly connected to the trolley and the other end fixed to the ground in the middle of the track. The movement and fixation of the trolley rely entirely on this parallel cylinder. The sprue is located at the front of the trolley, and its function is to guide molten steel into the mold. The interior of the sprue is a sprue 89 with a smoothly rounded inner surface, and a spout 90 is installed at the front end. During pouring, the spout extends into the mold. Two symmetrically arranged supports 88 are fixed on both sides of the rear of the sprue. The top of each support 88 is an arc groove, which mates with the spout shaft 87 at the spout position of the holding furnace. The arc groove supports the spout shaft, allowing it to rotate within the arc groove. When not pouring, the spout shaft 87 does not contact the arc groove. The holding furnace 85 is located behind the sprue and is a purchased medium-frequency induction heating furnace, used for holding and heating molten steel. The bottom of the holding furnace 85 is supported by a purchased weighing device 83, which is fixed to the trolley. On both sides of the holding furnace, there are cooperating tilting cylinders 84 and force-bearing shafts 86. The force-bearing shaft 86 is fixed to the holding furnace, and the bottom end of the tilting cylinder 84 is hinged to the trolley. The upper ring is connected to the force-bearing shaft in a fitted manner. When the holding furnace receives molten steel, this ring is separated from the force-bearing shaft and does not contact it. A nozzle shaft 87 is fixed at the nozzle 31 of the holding furnace. When the holding furnace receives molten steel, the induction coil cooling water and cable connections are disconnected. Only the weighing device 83 supports and contacts the holding furnace; the rest of the holding furnace does not contact any other components, allowing for accurate weighing of the molten steel. After receiving molten steel, the induction coil is connected to cooling water and cables, energized, and heated to perform deoxidation. During pouring, the cylinder rod of the tilting cylinder extends, pushing the force-bearing shaft. The furnace nozzle shaft falls into the arc-shaped groove, and the holding furnace rotates around the furnace nozzle shaft, tilting to fix the pouring point. After pouring is completed, the tilting cylinder drives the holding furnace back to its original position. For detailed structure, working process, and structural adjustments of the pouring device, please refer to the application filed on the same day for a centrifugal pouring vehicle for thin-walled tubes.

[0030] At both ends of the tube mold at the tube pushing station, a tube pushing device 6 and a tube connecting device 7 are respectively arranged. The tube pushing device 6 is used to push the thin-walled tube axially out of the tube mold, and the tube connecting device 7 receives the thin-walled tube pushed out of the tube mold, ensuring the consistency of the center line of the thin-walled tube and avoiding bending and deformation of the thin-walled tube.

[0031] The roller support device 11 includes a driving roller group and a driven roller group. The two roller groups are respectively set at both ends of each station. The rollers of the roller group cooperate with the rolling belt on the tube mold. The driving roller group is driven to rotate by a motor and drives the tube mold to rotate by friction. The driven roller group is driven to rotate by the tube mold by friction and is used to support and stabilize the tube mold.

[0032] The tube mold stepping device 10 is disposed between the driving support roller group and the driven support roller group. The structure of the tube mold stepping device 10 is shown in the attached figure. Figure 3 and attached Figure 4As shown, including the stepping frame, stepping cylinder 103 and lifting cylinder 105, stepping cylinder 103 for horizontal stepping movement of the stepping frame, lifting cylinder 105 for simultaneous lifting and landing of the stepping frame and stepping cylinder. Each end of the station is installed with a lifting cylinder, and a lifting cylinder is installed below the stepping cylinder fixing device. The two sides of the stepping frame are stepping beams 101, and the bottom surface of the stepping beam is fixed with a guide rail 106, which cooperates with the groove wheel 104 at the top of the lifting cylinder 105. The guide rail is a right angle steel guide rail, and the groove wheel is processed with a right angle groove. The guide rail steps under the guidance of the groove. The top surface of the stepping beam is welded with a supporting block 102, which constitutes a V shape. The position of the supporting block corresponds to the station of the centrifuge, and is used to support the pipe mold 12 when stepping. The pipe mold of the pushing pipe station is lifted into the cleaning station by the crown block, so it is not necessary to set the supporting block in the pushing pipe station. The lifting cylinder 105 is fixedly installed on the fixed frame 108, and the fixed frame 108 is fixedly installed on the ground. The upper part of the fixed frame is provided with a guide mechanism 107, which can adopt a guide rod and a guide sleeve cooperation. The guide rod acts up and down in the guide sleeve at the same time as the lifting cylinder, which is used for the guidance of the lifting cylinder, stabilizes the lifting cylinder, and avoids the bending moment of the lifting cylinder when the pipe mold steps. At the cleaning station end of the stepping frame, the stepping frame is fixedly connected with the stepping cylinder 103, and the extension and retraction of the stepping cylinder 103 realizes the horizontal movement of stepping and returning of the stepping frame.

[0033] The pipe mold stepping device 10 is used, as shown in the accompanying drawings Figure 4 As shown, the left pouring station 3 and the pushing pipe station 4 are in the lifting cylinder retraction state diagram, and the supporting block on the stepping beam does not contact the pipe mold 12, which is supported by the supporting wheel group. The right cleaning station 1 and the spraying station 2 are in the lifting cylinder lifting state diagram, and the pipe mold 12 is stably supported by the supporting block. As long as the stroke of the lifting cylinder is greater than the vertical distance between the lowest point of the pipe mold rolling belt and the top end of the supporting wheel, the stepping of the pipe mold can be realized. When the lifting cylinder lifts the pipe mold, the stepping cylinder 103 extends, pushes the stepping beam and the pipe mold together under the guidance of the groove wheel 104, and moves to the left. When the pipe mold steps one station, the lifting cylinder retracts, the stepping beam and the pipe mold fall, and the pipe mold is supported by the supporting wheel. When the lifting cylinder and the stepping frame are lowered to the lowest position, the top end of the supporting block is lower than the lowest point of the pipe mold, the stepping cylinder retracts one station, and returns to the original state, completing a working cycle of stepping the pipe mold.

[0034] It should be noted that: 1) The stepping beam can not use the guide rail, and the bottom surface of the stepping beam can be directly matched with the cylindrical surface of the groove wheel, and the flanges at both ends of the groove wheel can guide the movement of the stepping beam, as shown in the accompanying drawings Figure 5 2) The stepping cylinder can also be installed at the pushing pipe station end of the stepping frame. 3) Considering that the stepping cylinder is arranged at both ends of the stepping frame, the footprint needs to be increased, and the stepping cylinder can also be arranged in the middle of the supporting wheel group, as shown in the accompanying drawings Figure 64) The fixing frame of the lifting cylinder can also not be installed at both ends of each station, but can be arranged between adjacent stations, as long as the stepping frame can be lifted, as shown in the attached drawings Figure 7 5) The stepping cylinder can also be fixed in a hinged manner, and does not need to be lifted, as long as it can lift the stepping frame and translate the stepping beam. 6) If the bimetallic thin-walled pipe is cast, the pouring device can be arranged at both ends of the pipe mold in the pouring station.

[0035] The centrifugal machine adopts four stations and three pipe molds. The pipe mold in the pipe pushing station is lifted by a crane and is then moved to the cleaning station. The stepping frame is used to move the three pipe molds from the cleaning station to the pipe pushing station at the same time, which strengthens the matching of the production rhythm of each station, adapts to the fast rhythm of the thin-walled pipe centrifugal casting, and improves the production efficiency. The heat preservation furnace arranged on the trolley of the pouring device ensures the pouring temperature. When the heat preservation furnace receives the molten steel, only the weighter supports the heat preservation furnace, and the weight of the molten steel is accurately measured. The heat preservation furnace quickly pours all the molten steel into the runner bag at a fixed point, and can realize quantitative pouring, thereby ensuring the uniformity of the thickness size of the thin-walled pipe, forming well, meeting the requirements of the batch centrifugal production of the thin-walled pipe, and being especially suitable for the centrifugal production of the thin-walled pipe with a relatively long length.

Claims

1. A four-station centrifuge for producing thin-walled pipe, each station being provided with a roller arrangement, the stations being uniformly spaced apart; characterized in that: The four stations are sequentially arranged cleaning station, spraying station, pouring station and pushing tube station; a tube mold stepping device (10) is arranged between the supporting wheel groups of the supporting wheel device, the tube mold stepping device (10) comprises a stepping frame, a stepping cylinder and a lifting cylinder; the two sides of the stepping frame are stepping beams (101), the top surface of the stepping beam (101) is fixed with V-shaped supporting blocks (102), the positions of the supporting blocks (102) correspond to the stations of the centrifugal machine; the bottom surface of the stepping beam (101) is supported and matched by a groove wheel (104), the groove wheel (104) is located at the top of the lifting cylinder; the stroke of the lifting cylinder is greater than the vertical distance between the lowest point of the tube mold rolling belt and the top end of the supporting wheel; when the stepping frame is located at the lowest position, the top end of the supporting block (102) is lower than the lowest point of the tube mold.

2. A four-station centrifuge for producing thin-walled tubes according to claim 1, characterized in that: The lifting cylinder is fixedly installed on a fixed frame, a guide mechanism is arranged on the fixed frame, the guide mechanism adopts cooperation of a guide rod and a guide sleeve, and the guide mechanism is lifted and lowered simultaneously with the lifting cylinder.

3. A four-station centrifuge for producing thin-walled pipes according to claim 1, characterized in that: The bottom surface of the stepping beam (101) is fixed with a guide rail (106), and the guide rail (106) is supported and matched by the groove wheel (104).

4. A four-station centrifuge for producing thin-walled pipes according to claim 3, characterized in that: The guide rail (106) is a right-angle steel guide rail, and the groove wheel (104) is processed with a right-angle groove.

5. A four-station centrifuge for producing thin-walled pipes according to claim 1, characterized in that: One end or both ends of the tube mold of the pouring station are provided with pouring devices.

6. A four-station centrifuge for producing thin-walled pipes according to claim 5, characterized in that: The pouring device comprises a trolley, a holding furnace and a runner package installed on the trolley; a parallel cylinder (82) is arranged at the bottom of the trolley, one end of the parallel cylinder (82) is connected to the trolley, and the other end is fixed; the runner package is located at the front of the trolley, and the holding furnace is arranged behind the runner package; arc-shaped brackets (88) are fixed at the two sides of the rear part of the runner package, the arc-shaped brackets (88) are matched with furnace nozzles (87) of the holding furnace; the bottom of the holding furnace is supported by a weight sensor (83) fixed on the trolley, and a tilting furnace cylinder (84) and a stress shaft (86) are arranged at the two sides of the holding furnace and matched with each other; the bottom end of the tilting furnace cylinder (84) is hinged to the trolley, and the upper end is sleeved with the stress shaft (86); when the holding furnace receives molten steel, only the weight sensor (83) supports and contacts the holding furnace.

7. A four-station centrifuge for producing thin-walled pipes according to claim 6, characterized in that: The runner package is a horn runner with a smooth transition inner surface.

8. A four-station centrifuge for producing thin-walled pipes according to claim 1, characterized in that: The two ends of the tube mold of the pushing tube station are respectively arranged with pushing tube devices and pipe connecting devices.

9. A four-station centrifuge for producing thin-walled pipes according to claim 1, characterized in that: One end of the tube mold of the spraying station is arranged with a spraying device; one end of the tube mold of the cleaning station is provided with a dust removal cover.

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