Steel pipe straightening machine

Abstract

The invention belongs to the technical field of steel pipe calibration, and particularly relates to a steel pipe straightening machine which comprises a base and a control cabinet installed on the end face of the base, a machine table is installed on the end face of the base, a straightening roller assembly is arranged in the machine table, and the steel pipe straightening machine further comprises a bending follow-up unit installed on the end face of the base, the bending follow-up unit is arranged on one side of the feeding end of the straightening roller assembly. The metering regulation and control unit is installed in the machine table, the metering regulation and control unit is provided with a heat dissipation assembly, and the heat dissipation assembly is arranged in the machine table. The steel pipe is restrained, stress is released, steel pipe re-bending is restrained, straightness is improved, the requirement for high straightness is met, the restraining time and the heating temperature can be automatically adjusted and controlled based on the steel pipe bending degree, and time waste is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of steel pipe calibration, and in particular relates to a steel pipe straightening machine. Background Art

[0002] The steel pipe straightening machine is a device used to correct the straightness of steel pipes. When working, multiple sets of straightening rollers are used to apply pressure to the bent steel pipes to cause them to undergo plastic deformation to achieve the purpose of straightening. It is widely used in the petroleum, chemical, construction, machinery manufacturing and other industries. It can improve the quality of steel pipes, ensure that they meet the use standards of various projects and products, ensure the smooth progress of subsequent processing and installation, and improve production efficiency and product reliability.

[0003] At present, the roller straightening machine is a common steel pipe straightening equipment. It applies continuous and targeted pressure to the bent steel pipe through multiple groups of orderly arranged and position-adjustable rollers, so that the steel pipe produces plastic deformation under the pressure, gradually eliminates the curvature, and achieves high-precision straightening. For example, a steel pipe straightening machine disclosed in patent announcement number CN108817139B; However, due to the resilience of steel pipes, especially for steel pipes with large bending angles and small bending radius, although they can maintain good straightness for a short time after passing through the straightening machine, under the action of resilience and stress at the bending point, the steel pipe is easy to bend again, resulting in a slight bend in the straightened steel pipe, which cannot meet the straightening requirements of steel pipes with higher straightness requirements. Summary of the invention

[0004] The object of the present invention is to provide a steel pipe straightening machine in view of the above problems.

[0005] To achieve the above object, the present invention adopts the following technical scheme: a steel pipe straightening machine, comprising a base and a control cabinet installed on the end surface of the base, a machine table is installed on the end surface of the base, a straightening roller assembly is arranged inside the machine table, and further comprising: A bending follower unit is installed on the end surface of the base, and the bending follower unit is arranged on the feeding end side of the straightening roller assembly; A metering and regulating unit is installed inside the machine, and a heat dissipation component is installed on the metering and regulating unit, and the heat dissipation component is arranged inside the machine; A mounting pipe is mounted on the end surface of the base, and the mounting pipe is arranged on the side of the discharge end of the straightening roller assembly. A hydraulic constraint unit is installed on the side wall of the mounting pipe. The hydraulic constraint unit is used to constrain and heat the straightened steel pipe. The control cabinet controls the operation of the hydraulic constraint unit according to the electrical signal fed back by the metering and control unit. The knocking vibration unit is installed on the end surface of the base, and the knocking vibration unit is arranged on a side of the installation tube away from one end of the machine platform.

[0006] Preferably, the bending follower unit includes a follower inner ring arranged on one side of the straightening roller assembly, the inner wall of the follower inner ring is rotatably provided with a plurality of inner balls, the outer side of the follower inner ring is sleeved with a follower outer ring, and the follower outer ring is detachably connected to the follower inner ring, an annular groove is opened on the outer side wall of the follower outer ring, a plurality of outer balls are arranged on the groove wall of the annular groove, a support frame is fixedly installed on the end surface of the base, and a fixing ring is installed on the top of the support frame, the fixing ring is coaxial with the follower inner ring and the follower outer ring, and the inner wall of the fixing ring is arranged inside the annular groove, each of the outer balls contacts with the side wall of the fixing ring, a magnetic ring is fixedly sleeved on the groove wall of the annular groove, and a plurality of magnetic resistance regulating mechanisms are arranged inside the fixing ring.

[0007] Preferably, the metering and control unit includes a DC air pump arranged above the machine, a detection tube is installed at the air outlet end of the DC air pump, and a gas flow meter is installed on the detection tube, the detection end of the gas flow meter is arranged inside the detection tube, the magnetic resistance adjustment mechanism is electrically connected to the DC air pump through a control cabinet, and the gas flow meter is electrically connected to the control cabinet.

[0008] Preferably, the heat dissipation assembly comprises a hollow plate fixedly mounted inside the machine, and a plurality of heat dissipation holes are provided at the bottom of the hollow plate, and the detection tube and the hollow plate are fixedly connected to each other via a connecting tube.

[0009] Preferably, the hydraulic constraint unit includes an arc-shaped constraint strip arranged inside a mounting tube, a plurality of groups of electric hydraulic cylinders are fixedly plugged into the tube wall of the mounting tube, and the telescopic ends of the same group of electric hydraulic cylinders are detachably connected to the outer side walls of the corresponding arc-shaped constraint strips, an inner wall of each arc-shaped constraint strip is provided with an installation groove, and a strip heater is fixedly installed inside each installation groove, and an arc-shaped heat conduction plate is fixedly installed at the notch of each installation groove, the control cabinet controls the time for each arc-shaped constraint strip to constrain the steel pipe and the working temperature of the strip heater according to the metering signal of the gas flow meter, a proximity switch is fixedly plugged into the end of the tube wall of the mounting tube away from the machine, the proximity switch is used to detect the position of the steel pipe, and the proximity switch is electrically connected to the control cabinet.

[0010] Preferably, the percussion vibration unit includes a side plate fixedly installed on the end face of the base, an electric push rod is fixedly inserted into the side wall of the side plate, and a movable plate is installed at the telescopic end of the electric push rod, a cylinder is arranged on one side of the movable plate, a rotation drive assembly is installed on the side wall of the movable plate, and the rotation drive assembly drives the cylinder to rotate, a plurality of mounting tubes are fixedly inserted into the side wall of the cylinder, and an electromagnetic push rod is fixedly installed inside each mounting tube, and an arc-shaped impact block is installed at the telescopic end of each electromagnetic push rod, and the electric push rod and the electromagnetic push rod are electrically connected to the control cabinet.

[0011] Preferably, the magnetic resistance adjustment mechanism includes a columnar cavity opened inside the fixed ring, and each columnar cavity is evenly distributed in a ring shape about the axis of the fixed ring, each columnar cavity is slidably connected to a magnetic isolation block, and each magnetic isolation block is fixedly connected to an iron block at one end close to the follow-up inner ring, a spring is fixedly arranged between the end of each magnetic isolation block away from the follow-up inner ring and the columnar cavity on the same side, one end of the magnetic isolation block away from the follow-up inner ring is fixedly connected to a U-shaped insulating block, and one end of the U-shaped insulating block away from the magnetic isolation block is fixedly plugged with a conductive ring, a resistor rod is fixedly installed inside the columnar cavity, and the conductive ring is in sliding contact with the rod wall of the resistor rod, and each of the conductive rings and resistor rods are connected in series with a DC air pump through a control cabinet.

[0012] Preferably, a shunt pipe is fixedly inserted into the pipe wall of the connecting pipe, and a normally closed solenoid valve is installed inside the shunt pipe, a normally open solenoid valve is installed inside the connecting pipe at a position below the shunt pipe, a hollow block is fixedly connected to the end of the shunt pipe away from the connecting pipe, and two exhaust pipes are inserted into the bottom of the hollow block, two hollow bars are fixedly installed on the upper side of the inner pipe wall of the mounting pipe, and multiple jet holes are opened on the side walls of the two hollow bars away from the mounting pipe, and the two hollow bars are connected to the exhaust pipe on the same side.

[0013] Compared with the existing technology, the advantages of a steel pipe straightening machine are: Through the cooperation of the provided base, control cabinet, machine table and straightening roller assembly, the bent steel pipe can be initially straightened, and through the cooperation of the provided mounting pipe and hydraulic constraint unit, the steel pipe after initial straightening can be pressure constrained and heated. Constraining the steel pipe from the outside and heating it can suppress the repeated bending of the steel pipe caused by rebound elasticity and internal stress, reduce the yield strength of the material by heating, promote the release and redistribution of internal stress, stabilize the shape of the steel pipe, improve the straightness, and meet high straightness requirements.

[0014] Through the cooperation of the bending follow-up unit and the metering and control unit, the restraint time and heating temperature of the steel pipe just after straightening can be automatically adjusted based on the bending degree of the steel pipe, thereby reducing time waste while ensuring the quality of restraint and straightening of the steel pipe as much as possible. Secondly, based on the bending degree of the steel pipe, the degree of wear of the straightening roller assembly can be estimated, and the personnel can be reminded in time to perform maintenance on the straightening roller assembly. Finally, the metering and control unit can assist in cooling the straightening roller assembly to minimize the effects of accelerated wear of the straightening roller assembly caused by high heat.

[0015] Through the set percussion vibration unit, the percussion vibration can further refine the stress release effect. Through periodic external force impact, the internal stress distribution of the steel pipe can be more uniform. Combined with hydraulic constraint and heating, the three work together to stabilize the shape of the steel pipe, greatly improve the straightness, and fully meet the high straightness requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a steel pipe straightening machine provided by the present invention; Figure 2 It is a schematic diagram of the internal structure of a steel pipe straightening machine provided by the present invention; Figure 3 It is a structural schematic diagram of a bending follower unit of a steel pipe straightening machine provided by the present invention; Figure 4 The invention provides a steel pipe straightening machine. Figure 2 A magnified view of the structure of part A; Figure 5 It is a three-dimensional structural schematic diagram of a mounting pipe of a steel pipe straightening machine provided by the present invention; Figure 6 It is a schematic diagram of the internal structure of a mounting pipe of a steel pipe straightening machine provided by the present invention; Figure 7 The invention provides a steel pipe straightening machine. Figure 6 A magnified view of the structure of part B; Figure 8 It is a structural schematic diagram of a percussion vibration unit of a steel pipe straightening machine provided by the present invention; Fig. 9 It is a schematic diagram of the internal structure of a cylinder of a steel pipe straightening machine provided by the present invention from a side view; Fig.10 The invention provides a steel pipe straightening machine. Figure 3 The structure of the middle C part is enlarged; Fig.11 The invention provides a schematic diagram of a three-dimensional connection structure of a follower inner ring, a follower outer ring and a fixed ring of a steel pipe straightening machine.

[0017] In the figure: 1 base, 2 control cabinet, 3 machine, 4 straightening roller assembly, 5 bending follower unit, 51 follower inner ring, 52 inner ball, 53 follower outer ring, 54 annular groove, 55 outer ball, 56 support frame, 57 fixing ring, 58 magnetic ring, 6 metering control unit, 61 DC air pump, 62 detection tube, 63 gas flow meter, 7 heat dissipation assembly, 71 hollow plate, 72 heat dissipation hole, 73 connecting pipe, 8 installation pipe, 9 hydraulic constraint unit, 91 arc constraint strip, 92 electric hydraulic cylinder, 93 installation groove, 94 strip heater, 95 arc heat conduction Plate, 96 proximity switch, 10 knock vibration unit, 101 side plate, 102 electric push rod, 103 movable plate, 104 cylinder, 105 rotation drive assembly, 106 mounting tube, 107 electromagnetic push rod, 108 arc-shaped impact block, 11 magnetic attraction resistance adjustment mechanism, 111 columnar cavity, 112 magnetic isolation block, 113 iron block, 114 spring, 115 U-shaped insulating block, 116 conductive ring, 117 resistance rod, 12 shunt pipe, 13 normally closed solenoid valve, 14 normally open solenoid valve, 15 hollow block, 16 exhaust pipe, 17 hollow bar, 18 jet hole. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] like Figure 1-Figure 11 As shown, a steel pipe straightening machine comprises a base 1 and a control cabinet 2 installed on the end face of the base 1, a machine table 3 is installed on the end face of the base 1, a straightening roller assembly 4 is arranged inside the machine table 3, and further comprises: a bending follower unit 5, the bending follower unit 5 is installed on the end face of the base 1, and the bending follower unit 5 is arranged on the feeding end side of the straightening roller assembly 4, the bending follower unit 5 comprises a follower inner ring 51 arranged on one side of the straightening roller assembly 4, a plurality of inner balls 52 are rotatably arranged on the inner wall of the follower inner ring 51, a follower outer ring 53 is sleeved on the outer side of the follower inner ring 51, and the follower outer ring 53 and the follower inner ring 51 are connected to each other. The ring 51 is detachably connected, the outer side wall of the follower outer ring 53 is provided with an annular groove 54, and the groove wall of the annular groove 54 is provided with multiple outer balls 55. A support frame 56 is fixedly installed on the end face of the base 1, and a fixing ring 57 is installed on the top of the support frame 56. The fixing ring 57 is coaxial with the follower inner ring 51 and the follower outer ring 53, and the inner wall of the fixing ring 57 is arranged inside the annular groove 54. Each outer ball 55 is in contact with the side wall of the fixing ring 57, and the groove wall of the annular groove 54 is fixedly sleeved with a magnetic ring 58. The follower inner ring 51 and the follower outer ring 53 are detachable and replaceable to adapt to steel pipes of different diameters.

[0020] The metering and control unit 6 is installed inside the machine 3. The metering and control unit 6 is equipped with a heat dissipation component 7, and the heat dissipation component 7 is arranged inside the machine 3. The metering and control unit 6 includes a DC air pump 61 arranged above the machine 3. The air outlet end of the DC air pump 61 is equipped with a detection tube 62, and the detection tube 62 is equipped with a gas flow meter 63. The detection end of the gas flow meter 63 is arranged inside the detection tube 62. The magnetic resistance adjustment mechanism 11 is electrically connected to the DC air pump 61 through the control cabinet 2, and the gas flow meter 63 is electrically connected to the control cabinet 2.

[0021] The mounting tube 8 is mounted on the end surface of the base 1, and the mounting tube 8 is arranged on the discharge end side of the straightening roller assembly 4. A hydraulic constraint unit 9 is installed on the side wall of the mounting tube 8. The hydraulic constraint unit 9 is used to constrain and heat the straightened steel pipe. The control cabinet 2 controls the operation of the hydraulic constraint unit 9 according to the electrical signal fed back by the metering and control unit 6. The hydraulic constraint unit 9 includes an arc-shaped constraint strip 91 arranged inside the mounting tube 8. Multiple groups of electric hydraulic cylinders 92 are fixedly plugged into the tube wall of the mounting tube 8, and the telescopic ends of the same group of electric hydraulic cylinders 92 are detachably connected to the outer side wall of the corresponding arc-shaped constraint strip 91. The inner wall of each arc-shaped constraint strip 91 is provided with a mounting groove 93. A strip heater 94 is fixedly installed inside each mounting groove 93, and an arc-shaped heat conduction plate 95 is fixedly installed at the slot of each mounting groove 93. The control cabinet 2 controls the time for each arc-shaped constraint strip 91 to constrain the steel pipe and the working temperature of the strip heater 94 according to the metering signal of the gas flow meter 63. A proximity switch 96 is fixedly connected to the end of the pipe wall of the mounting pipe 8 away from the machine 3. The proximity switch 96 is used to detect the position of the steel pipe. The proximity switch 96 is electrically connected to the control cabinet 2. The proximity switch 96 emits a light signal by the transmitter. When the steel pipe approaches, the reflected light is received by the receiver. The position of the steel pipe is determined by judging whether the reflected light is received.

[0022] The knocking vibration unit 10 is installed on the end surface of the base 1, and the knocking vibration unit 10 is arranged on the side of the mounting tube 8 away from the end of the machine 3. The knocking vibration unit 10 includes a side plate 101 fixedly installed on the end surface of the base 1, and the side wall of the side plate 101 is fixedly plugged with an electric push rod 102, and the telescopic end of the electric push rod 102 is installed with a movable plate 103, a cylinder 104 is arranged on one side of the movable plate 103, and a rotating drive component 105 is installed on the side wall of the movable plate 103, and the rotating drive component 105 is installed on the side wall of the movable plate 103. Component 105 drives the cylinder 104 to rotate. Multiple mounting tubes 106 are fixedly inserted into the side wall of the cylinder 104, and an electromagnetic push rod 107 is fixedly installed inside each mounting tube 106. An arc-shaped impact block 108 is installed at the telescopic end of each electromagnetic push rod 107. The electric push rod 102 and the electromagnetic push rod 107 are electrically connected to the control cabinet 2. The rotation drive component 105 includes components such as a motor, a drive rod, and a coupling. The motor can drive the cylinder 104 to rotate through the drive rod.

[0023] The interior of the fixed ring 57 is provided with a plurality of magnetic resistance adjustment mechanisms 11, the magnetic resistance adjustment mechanisms 11 include a columnar cavity 111 opened inside the fixed ring 57, and each columnar cavity 111 is evenly distributed in a ring shape about the axis of the fixed ring 57, each columnar cavity 111 is slidably connected with a magnetic isolation block 112, and each magnetic isolation block 112 is fixedly connected to an iron block 113 at one end close to the follower inner ring 51, and a spring 114 is fixedly arranged between the end of each magnetic isolation block 112 away from the follower inner ring 51 and the columnar cavity 111 on the same side, The end of the block 112 away from the follower inner ring 51 is fixedly connected to a U-shaped insulating block 115, and the end of the U-shaped insulating block 115 away from the magnetic isolation block 112 is fixedly inserted with a conductive ring 116, a resistance rod 117 is fixedly installed inside the columnar cavity 111, and the conductive ring 116 is in sliding contact with the rod wall of the resistance rod 117, each conductive ring 116 and resistance rod 117 is connected in series with the DC air pump 61 through the control cabinet 2, and when the contact position of the conductive ring 116 and the resistance rod 117 changes, the current intensity passed into the DC air pump 61 will also change synchronously.

[0024] The heat dissipation component 7 includes a hollow plate 71 fixedly installed inside the machine 3, and a plurality of heat dissipation holes 72 are opened at the bottom of the hollow plate 71. The detection tube 62 and the hollow plate 71 are fixedly connected to a connecting pipe 73. A shunt pipe 12 is fixedly inserted into the pipe wall of the connecting pipe 73, and a normally closed solenoid valve 13 is installed inside the shunt pipe 12. A normally open solenoid valve 14 is installed inside the connecting pipe 73 below the shunt pipe 12. A hollow block 15 is fixedly connected to one end of the shunt pipe 12 away from the connecting pipe 73, and two exhaust pipes 16 are inserted at the bottom of the hollow block 15. Two hollow bars 17 are fixedly installed on the upper side of the inner pipe wall of the mounting pipe 8, and a plurality of jet holes 18 are opened on the side walls of the two hollow bars 17 away from the mounting pipe 8. The two hollow bars 17 are connected to the exhaust pipe 16 on the same side, which can assist in cooling the heated steel pipe and keep the cooling of the steel pipe sufficiently stable.

[0025] The operating principle of the present invention is described as follows: the steel pipe to be straightened is inserted into the follower inner ring 51 (refer to Figure 1 The straightening roller assembly 4 is used to straighten the steel pipe. The straightening roller assembly 4 is used to straighten the steel pipe. The straightening roller assembly 4 is used to straighten the steel pipe. The straightening roller assembly 4 is used to straighten the steel pipe. The straightening roller assembly 4 is used to straighten the steel pipe. The straightening roller assembly 4 is used to straighten the steel pipe. The straightening roller assembly 4 is used to straighten the steel pipe. The straightening roller assembly 4 is used to straighten the steel pipe. The straightening roller assembly 4 is used to straighten the steel pipe. The straightening roller assembly 4 is used to straighten the steel pipe. The straightening roller assembly 4 is used to straighten the steel pipe. The straightening roller assembly 4 is used to straighten the steel pipe. The straightening roller assembly 4 is used to straighten the steel pipe. The straightening roller assembly 4 is used to straighten the steel pipe. The straightening roller assembly 4 is used to straighten the steel pipe. When the steel pipe is straightened, since the steel pipe passes through the follower inner ring 51, when the bending part of the steel pipe moves to the position of the follower inner ring 51, the follower inner ring 51 will move to one side under the pressure of the steel pipe movement. For example, the bending part of the steel pipe bends downward. When the bending part moves to the follower inner ring 51, the steel pipe bending downward will squeeze the position of the follower inner ring 51, so that the follower inner ring 51 moves downward synchronously. Similarly, when the steel pipe bends in other directions, the follower inner ring 51 will also move synchronously, and the follower inner ring 51 will drive the magnetic ring 58 to move synchronously through the follower outer ring 53, so the magnetic ring 5 The relative position between the magnetic ring 58 and the fixed ring 57 will produce relative displacement due to the bending part of the steel pipe. When the magnetic ring 58 moves to one side, the magnetic attraction force on the side iron block 113 becomes larger due to the approach of the magnetic ring 58. Therefore, the side iron block 113 will drive the U-shaped insulating block 115 to move synchronously through the magnetic isolation block 112, so that the conductive ring 116 moves in the direction close to the follower inner ring 51, and the greater the bending angle, the greater the displacement distance of the conductive ring 116. When the conductive ring 116 moves in the direction of the follower inner ring 51, the resistance rod 117 is connected to the connection circuit between the conductive ring 116 and the DC air pump 61. The length of the resistor rod 117, the conductive ring 116 and the DC air pump 61 is shortened, and therefore, the resistance of the overall connection loop of the resistor rod 117, the conductive ring 116 and the DC air pump 61 is reduced, and the current intensity passed into the DC air pump 61 is increased synchronously (wherein, when the follower inner ring 51 is in the original position, the distance between the magnetic ring 58 and each iron block 113 is equal, and under the action of the spring 114, each conductive ring 116 is at the end of the resistor rod 117 away from the follower inner ring 51. When the follower inner ring 51 moves with the curved part of the steel pipe, the magnetic ring 58 moves synchronously. At this time, the distance between the magnetic ring 58 and the iron block 113 in the moving direction is reduced, so the iron block in this direction The magnetic attraction force of the magnetic attraction ring 58 becomes larger, so the conductive ring 116 at this position will move outward because the iron block 113 is attracted, and for the iron block 113 at the position where the magnetic attraction ring 58 is far away, since the magnetic attraction ring 58 is far away, the magnetic attraction force of the magnetic attraction ring 58 on the iron block 113 at this position becomes weaker, so the iron block 113 will not move, and the conductive ring 116 at this position will not move either. Therefore, only the position of the conductive ring 116 at a position close to the magnetic attraction ring 58 will change, resulting in a shortened length of the connection loop between the resistor rod 117 at this position and the conductive ring 116 and the DC air pump 61); After the control cabinet 2 is started, the DC air pump 61 will be synchronously controlled to work. Since the DC air pump 61 is connected in series with the resistor rod 117 and the conductive ring 116, the greater the bending angle of the steel pipe, the greater the current intensity passed into the DC air pump 61. At this time, the output power of the DC air pump 61 is greater, so the more air flow is discharged through the detection tube 62, so the gas flow monitored by the gas flow meter 63 is greater, and the airflow discharged through the detection tube 62 will be discharged into the hollow plate 71 through the connecting tube 73, and ejected through each heat dissipation hole 72. The ejected airflow will be blown to the surface of the straightening roller assembly 4, so as to take away the heat on the surface of the straightening roller assembly 4. Since the straightening roller assembly 4 generates heat under the action of friction when straightening the steel pipe, the straightening roller assembly 4 will be subjected to friction after the temperature rises, and it is more susceptible to wear. Therefore, by assisting the straightening roller assembly 4 to cool down, the straightening roller assembly 4 can be protected to a certain extent. The steel pipe that has just been straightened will enter between each arc-shaped constraint strip 91 from the discharge end of the straightening roller assembly 4, and after the steel pipe is separated from the straightening roller assembly 4, the proximity switch 96 will detect that the steel pipe is in place, and the control cabinet 2 will control the straightening roller assembly 4 to suspend work. At the same time, the control cabinet 2 controls each electric hydraulic cylinder 92 to work for 2 seconds at a time, so that each arc-shaped constraint strip 91 moves toward each other. After the electric hydraulic cylinder 92 finishes working, each arc-shaped constraint strip 91 will be against the outer wall of the straightened steel pipe and enclose and constrain the steel pipe. Subsequently, the control cabinet 2 will control each strip heater 94 to work, and the strip heater 94 will heat the steel pipe. The gas flow meter 63 will convert the measured flow value into an electrical signal and output it to the control Control cabinet 2 (electrical signal is in the range of 4mA to 20mA), the larger the flow value, the greater the corresponding electric signal strength, when the bending angle of the steel pipe before straightening is larger, after being straightened by the straightening roller assembly 4, the greater the possibility of re-bending, and the larger the corresponding airflow flow value, the greater the electric signal strength obtained by the control cabinet 2, at this time, the control cabinet 2 controls each arc-shaped constraint strip 91 to constrain the steel pipe for a longer time, and controls the strip heater 94 to heat the higher temperature (the control cabinet 2 establishes the relationship between the electric signal strength and time and temperature, and can directly control the corresponding constraint time and heating temperature according to the electric signal strength, and this relationship can be measured in advance by testing the same specifications and materials under the same conditions); In the process of restraining the steel pipe, the control cabinet 2 controls the electric push rod 102 to work for 5 seconds, so that the cylinder 104 enters the interior of the steel pipe. Then, the control cabinet 2 starts the rotation drive component 105 and controls each electromagnetic push rod 107 to work at a frequency of power on for 1 second and power off for 2 seconds. The rotation drive component 105 can drive the cylinder 104 to rotate (the rotation drive component 105 includes components such as a motor, a drive rod, and a coupling). After the electromagnetic push rod 107 is powered on, it will push the arc-shaped impact block 108 on the same side toward the direction of the steel pipe. Move and hit the steel pipe, and each electromagnetic push rod 107 is intermittently energized, so it can cooperate with the rotation to hit the steel pipe at a certain frequency. The vibration generated can refine the stress release area. After the steel pipe is heated, the yield strength is reduced, the atomic activity is intensified, and the stress is easier to redistribute. At the same time, the arc-shaped constraint strip 91 evenly supports the steel pipe to ensure that it is vibrated in a stable form. The vibration is combined with heating to allow the stress to be quickly and evenly dispersed within a controllable range. With the synergistic effect of the constraint, the stress of the steel pipe can be quickly released, the resilience of the steel pipe is suppressed, and the straightness of the steel pipe is guaranteed. Among them, the heating time of the strip heater 94 is 1 minute. After working for 1 minute, the strip heater 94 stops working. Then, the control cabinet 2 controls the normally open solenoid valve 14 and the normally closed solenoid valve 13 to work. At this time, the airflow will enter the hollow block 15 through the shunt pipe 12, and enter the hollow strip 17 through the exhaust pipe 16, and finally spray out through each jet hole 18, so that the steel pipe can be cooled. Until the constraint time is reached, the control cabinet 2 controls the DC air pump 61, the normally open solenoid valve 14, and the normally closed solenoid valve 13 to stop working, and then the control cabinet 2 records the flow value of the gas flow meter 63, and resets the counting data of the gas flow meter 63 to zero. Then, the control cabinet 2 controls each electric hydraulic cylinder 92 to perform a timed return work. At this time, the personnel The straightened steel pipe can be removed and the next steel pipe can be straightened. During the straightening process, the control cabinet 2 will add together the values ​​measured by the gas flow meter 63 each time and display the accumulated gas flow. Since the straightening roller assembly 4 will be affected by the wear of the steel pipe, and the greater the bending angle of the steel pipe, the greater the friction force it is subjected to, and the faster the wear increases, and the change in gas flow is based on the bending degree of the steel pipe, when the accumulated gas flow reaches the preset value (for example, the gas flow reaches 10,000 m³), ​​the control cabinet 2 will remind the personnel to perform maintenance on the straightening roller assembly 4 through its own alarm module, such as checking whether the wear between the rollers affects the straightening accuracy, and adding lubricating oil to the bearings of the rollers, etc.; Among them, the length of the mounting tube 8 is 1.5 meters. The number of mounting tubes 8 and hydraulic constraint units 9 can be increased according to the length of the steel pipe to be straightened. Multiple mounting tubes 8 are fixed together in series to meet different steel pipe straightening requirements. In order to improve work efficiency, the mounting tube 8 and the hydraulic constraint unit 9 inside it can be set into multiple groups, and the multiple groups of mounting tubes 8 and hydraulic constraint units 9 are driven by the driving member to switch in the front and rear directions. For example, after the straightening roller assembly 4 straightens a steel pipe, the corresponding hydraulic constraint unit 9 constrains and eliminates stress on the steel pipe, and then the mounting tube 8 and hydraulic constraint unit 9 are switched by the driving member. At this time, the straightening roller assembly 4 can continue to straighten the next steel pipe, saving time and improving work efficiency (when setting multiple groups of mounting tubes 8 and hydraulic constraint units 9, the number and material of the exhaust pipe 16 need to be designed accordingly, and an electric control valve should be set at the exhaust to accommodate multiple mounting tubes 8). Secondly, the follower inner ring The support frame 56 is used to support the fixing ring 57 and is not connected to the following inner ring 51 and the following outer ring 53. When not working normally, under the action of the gravity of the following outer ring 53 and the following inner ring 51, the following outer ring 53 is located at the lower inner side of the fixing ring 57. Therefore, when in use, the following outer ring 53 needs to be extracted upward to facilitate the insertion of the steel pipe. In order to improve the convenience of use, an elastic telescopic frame (not shown in the figure) can be set between the following outer ring 53 and the base 1. The elastic telescopic frame can be used to support the following outer ring 53 so that the following outer ring 53 can remain coaxial with the fixing ring 57 when not in use. Due to the telescopic performance of the elastic support frame, it will not affect the synchronous displacement of the following outer ring 53 with the bending part of the steel pipe.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel pipe straightening machine, comprising a base (1) and a control cabinet (2) mounted on the end surface of the base (1), a machine table (3) being mounted on the end surface of the base (1), a straightening roller assembly (4) being arranged inside the machine table (3), characterized in that: Also includes: A bending follower unit (5) is mounted on the end surface of the base (1), and the bending follower unit (5) is arranged on the feeding end side of the straightening roller assembly (4); A metering and control unit (6) is installed inside the machine (3); the metering and control unit (6) is equipped with a heat dissipation component (7), and the heat dissipation component (7) is arranged inside the machine (3); A mounting tube (8) is mounted on the end surface of the base (1), and the mounting tube (8) is arranged on the discharge end side of the straightening roller assembly (4). A hydraulic constraint unit (9) is installed on the side wall of the mounting tube (8). The hydraulic constraint unit (9) is used to constrain and heat the straightened steel pipe. The control cabinet (2) controls the operation of the hydraulic constraint unit (9) according to the electrical signal fed back by the metering and control unit (6); A knocking vibration unit (10) is mounted on an end surface of the base (1), and the knocking vibration unit (10) is arranged on a side of the mounting tube (8) away from an end of the machine platform (3); The bending follower unit (5) comprises a follower inner ring (51) arranged on one side of the straightening roller assembly (4); a plurality of inner balls (52) are rotatably arranged on the inner wall of the follower inner ring (51); a follower outer ring (53) is sleeved on the outer side of the follower inner ring (51); the follower outer ring (53) is detachably connected to the follower inner ring (51); an annular groove (54) is formed on the outer side wall of the follower outer ring (53); a plurality of outer balls (55) are arranged on the groove wall of the annular groove (54); and a support frame is fixedly mounted on the end surface of the base (1). (56), and a fixing ring (57) is installed on the top of the support frame (56), the fixing ring (57) is coaxial with the follower inner ring (51) and the follower outer ring (53), and the inner wall of the fixing ring (57) is arranged inside the annular groove (54), each of the outer balls (55) is in contact with the side wall of the fixing ring (57), the groove wall of the annular groove (54) is fixedly sleeved with a magnetic ring (58), and a plurality of magnetic resistance adjustment mechanisms (11) are arranged inside the fixing ring (57), and the bending follower unit (5) is used to detect the bending degree of the steel pipe; The metering and control unit (6) comprises a DC air pump (61) arranged above the machine platform (3); a detection tube (62) is installed at the air outlet end of the DC air pump (61); a gas flow meter (63) is installed on the detection tube (62); a detection end of the gas flow meter (63) is arranged inside the detection tube (62); the magnetic resistance adjustment mechanism (11) is electrically connected to the DC air pump (61) through the control cabinet (2); the gas flow meter (63) is electrically connected to the control cabinet (2); the metering and control unit (6) is electrically connected to the bending follower unit (5); and the metering and control unit (6) converts the measured gas flow into an electrical signal and feeds it back to the control cabinet (2); The knocking vibration unit (10) comprises a side plate (101) fixedly mounted on the end surface of the base (1); an electric push rod (102) is fixedly inserted into the side wall of the side plate (101); a movable plate (103) is installed at the telescopic end of the electric push rod (102); a cylinder (104) is arranged on one side of the movable plate (103); a rotating drive assembly (105) is installed on the side wall of the movable plate (103); the rotating drive assembly (105) drives the cylinder (104) to rotate; a plurality of mounting cylinders (106) are fixedly inserted into the side wall of the cylinder (104); an electromagnetic push rod (107) is fixedly mounted inside each mounting cylinder (106); and an arc-shaped impact block (108) is installed at the telescopic end of each electromagnetic push rod (107); the electric push rod (102) and the electromagnetic push rod (107) are both electrically connected to the control cabinet (2); and the knocking vibration unit (100) is used to knock and vibrate the steel pipe.

2. A steel pipe straightening machine according to claim 1, characterized in that: The heat dissipation component (7) comprises a hollow plate (71) fixedly mounted inside the machine platform (3), and a plurality of heat dissipation holes (72) are provided at the bottom of the hollow plate (71). The detection tube (62) and the hollow plate (71) are fixedly connected to each other via a connecting tube (73).

3. A steel pipe straightening machine according to claim 1, characterized in that: The hydraulic constraint unit (9) comprises an arc-shaped constraint strip (91) arranged inside the mounting tube (8); a plurality of groups of electric hydraulic cylinders (92) are fixedly plugged into the tube wall of the mounting tube (8); and the telescopic ends of the same group of electric hydraulic cylinders (92) are detachably connected to the outer side wall of the corresponding arc-shaped constraint strip (91); the inner wall of each arc-shaped constraint strip (91) is provided with a mounting groove (93); and a strip heater (94) is fixedly installed inside each mounting groove (93); and an arc-shaped heat conducting plate (95) is fixedly installed at the notch of each mounting groove (93); the control cabinet (2) controls the time for each arc-shaped constraint strip (91) to constrain the steel pipe and the working temperature of the strip heater (94) according to the metering signal of the gas flow meter (63); and a proximity switch (96) is fixedly plugged into the end of the tube wall of the mounting tube (8) away from the machine platform (3); the proximity switch (96) is used to detect the position of the steel pipe, and the proximity switch (96) is electrically connected to the control cabinet (2).

4. A steel pipe straightening machine according to claim 1, characterized in that: The magnetic attraction resistance adjustment mechanism (11) comprises a columnar cavity (111) provided inside the fixed ring (57), and each columnar cavity (111) is evenly distributed in a ring shape about the axis of the fixed ring (57), each columnar cavity (111) is slidably connected to a magnetic isolation block (112) inside, and each magnetic isolation block (112) is fixedly connected to an iron block (113) at one end close to the follower inner ring (51), and each magnetic isolation block (112) is fixedly provided between one end away from the follower inner ring (51) and the columnar cavity (111) on the same side. A spring (114), one end of the magnetic isolation block (112) away from the follower inner ring (51) is fixedly connected to a U-shaped insulating block (115), and one end of the U-shaped insulating block (115) away from the magnetic isolation block (112) is fixedly plugged with a conductive ring (116), a resistance rod (117) is fixedly installed inside the columnar cavity (111), and the conductive ring (116) is in sliding contact with the rod wall of the resistance rod (117), and each of the conductive rings (116) and the resistance rod (117) is connected in series with the DC air pump (61) through the control cabinet (2).

5. A steel pipe straightening machine according to claim 2, characterized in that: A shunt pipe (12) is fixedly inserted into the wall of the connecting pipe (73), and a normally closed solenoid valve (13) is installed inside the shunt pipe (12); a normally open solenoid valve (14) is installed inside the connecting pipe (73) at a position below the shunt pipe (12); a hollow block (15) is fixedly connected to one end of the shunt pipe (12) away from the connecting pipe (73), and two exhaust pipes (16) are inserted into the bottom of the hollow block (15); two hollow bars (17) are fixedly installed on the upper side of the inner wall of the mounting pipe (8), and a plurality of air injection holes (18) are provided on the side walls of the two hollow bars (17) away from the mounting pipe (8); and the two hollow bars (17) are both connected to the exhaust pipe (16) on the same side.

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