A bending machine for bending metal tubes

Abstract

The present invention relates to the technical field of bending machines, and discloses a bending machine for bending metal tubes, including an adjustable resistance mechanism and a rotating driven mechanism, wherein a longitudinal hollow shell capable of rotating with a rotor, a lower rotating disk capable of rotating with the longitudinal hollow shell and capable of longitudinally moving inside the longitudinal hollow shell, and an upper rotating disk capable of rotating with the lower rotating disk and capable of driving the horizontal hollow shell to rotate are arranged inside the bending machine. The bending machine for bending metal tubes can adjust the bending radius corresponding to the equipment according to the diameter of the tube body of the bent steel tube, so that the tube body diameter and the bending radius of the equipment match, so that the inner structure and the outer structure of the tube body in the bending area are in contact with the corresponding structures, so as to ensure that the bending effect of the steel tube at the bending part is more accurate. In addition, the device can prevent the occurrence of damage to the drive motor caused by excessive bending resistance, so as to improve the protection capability of the drive motor.

Description

Technical Field

[0001] The invention relates to the technical field of bending machines, in particular to a bending machine for bending metal pipes. Background Art

[0002] A bending machine is a type of forging machine. It is a machine that can bend thin plates and is mainly used in the metal processing industry.

[0003] For example, the Chinese patent with the publication number "CN220574409U" announced "a metal tube bending machine suitable for different diameters", whose main structure includes a device base, a driving motor is arranged in the middle position of the device base, and a rotating disk is connected to the top of the driving motor. The metal tube bending machine suitable for different diameters is provided with a movable plate, which can be displaced along the first limiting slide groove driven by the first threaded rod, and the upper surface of the movable plate and the rotating base are provided with a fixed bracket, and the limiting block inside the fixed bracket can be displaced inside the fixed bracket driven by the second threaded rod, so that the device can fix metal tubes of different diameters and can be adjusted according to the length of the metal tube; a fixed plate is provided, and the movable positioning block on the upper surface of the fixed plate can be displaced along the second limiting slide groove driven by the second threaded rod, so that the movable positioning block can adapt to metal tubes of different diameters, which is convenient for bending metal tubes of different diameters.

[0004] However, when the above-mentioned metal tube bending machine suitable for different diameters is actually working, the steel tube at the bending part, that is, the tube body near the movable positioning block cannot obtain a bending radius that matches the diameter of the steel tube. The bending radius of the equipment is larger than the diameter of the steel tube, resulting in the defect of poor final bending angle accuracy caused by the excessive bending radius of the steel tube when the steel tube is bent. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a bending machine for bending metal pipes, which can adjust the bending radius of the equipment according to the pipe body diameter of the bent steel pipe, so that the pipe body diameter and the bending radius of the equipment match each other, so that the inner structure and the outer structure of the pipe body in the bending area are in contact with the corresponding structures, ensuring that the bending effect of the steel pipe in the bending part is more precise. In addition, the device can prevent the drive motor from being damaged due to excessive bending resistance, so as to improve the protection capability of the drive motor and solve the above-mentioned technical problems.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a bending machine for metal pipe bending, comprising a workbench with multiple supporting legs installed at the bottom, a component placement port arranged in the workbench, a positioning pin fixedly installed at the upper end of the workbench, a bottom fixing plate fixedly installed at the bottom of two supporting legs, and a driving motor fixedly installed on the upper surface of the bottom fixing plate through a driving motor mounting shell, and also comprising an adjustable interference mechanism, wherein a horizontal hollow shell located on one side of the workbench and capable of indirectly rotating with the rotor of the driving motor is arranged inside, an L-shaped telescopic rod partially located inside the horizontal hollow shell and capable of horizontal movement, and a sliding sleeve body installed on the periphery of the longitudinal rod body of the L-shaped telescopic rod and cooperating with the positioning pin to bend the steel pipe; and a rotating driven mechanism, wherein a longitudinal hollow shell capable of rotating with the rotor, a lower rotating disk capable of rotating with the longitudinal hollow shell and capable of longitudinally moving inside the longitudinal hollow shell, and an upper rotating disk capable of rotating with the lower rotating disk and capable of driving the horizontal hollow shell to rotate are arranged inside.

[0007] Preferably, the adjustable interference mechanism includes a horizontal hollow shell located on one side of the workbench, the outer circumferential surface of the horizontal hollow shell is fixedly installed with a fixing ring body, the bottom of the fixing ring body is fixedly installed with an L-shaped fixing bracket, the interior of the L-shaped fixing bracket is provided with an axial body fixing hole, the horizontal hollow shell is provided with an internal threaded cavity with an end in an open state at the end facing away from the locating pin, the horizontal hollow shell is provided with a No. 1 component through-hole connecting the external space and the solid end surface of the internal threaded cavity at the end surface facing the locating pin, the horizontal hollow shell is provided with an external threaded rod installed with a threaded structure inside the internal threaded cavity, the external threaded rod is fixedly installed with a No. 1 rotating cap at the end located outside the internal threaded cavity, the external threaded rod is installed with an L-shaped telescopic rod capable of relative rotation at the end located inside the internal threaded cavity through a bearing, the transverse rod body of the L-shaped telescopic rod passes through the No. 1 component through-hole, and the bottom of the longitudinal rod body of the L-shaped telescopic rod is provided with a rotatable sliding sleeve body through a bearing, and the sliding sleeve body is located around the locating pin.

[0008] Preferably, the structural shape of the L-shaped telescopic rod cross section is consistent with the structural shape of the perforated cross section of the No. 1 component, both are polygonal structures, and the structural dimensions of the L-shaped telescopic rod cross section match the structural dimensions of the perforated cross section of the No. 1 component.

[0009] Preferably, the thread structure includes an internal thread structure arranged inside the internal thread cavity and an external thread structure arranged on the rod body of the external thread rod, and the internal thread structure matches the external thread structure.

[0010] Preferably, the rotary driven mechanism includes a longitudinal hollow shell, the bottom end of the longitudinal hollow shell is provided with a component fixing groove for fixing and installing the rotor, a component No. 1 movable cavity is provided inside the longitudinal hollow shell, a component No. 2 through-hole is provided at the top of the component No. 1 movable cavity, and a component No. 2 movable cavity with an open top is provided at the top of the component No. 2 through-hole, a movable plate No. 1 capable of axially moving along the movable cavity No. 1 is placed inside the movable cavity No. 1 of the longitudinal hollow shell, and a driven shaft passing through the component No. 2 through-hole is fixedly installed on the upper end surface of the movable plate No. 1, and the driven A lower rotating disk capable of axially moving along the movable cavity of component No. 2 is fixedly installed on the shaft at the top end of the movable cavity of component No. 2, and a plurality of hemispherical protrusion structures integrally formed therewith are arranged on the upper end face of the lower rotating disk, and an upper rotating disk capable of rotating is installed through bearings on the longitudinal hollow outer shell inside the movable cavity of component No. 2, and a plurality of hemispherical groove structures capable of being clamped on the periphery of the top area of ​​the hemispherical protrusion structures are arranged on the lower end face of the upper rotating disk, and a protruding fixing shaft integrally formed therewith and fixedly installed inside the fixing hole of the shaft body is arranged on the upper end face of the upper rotating disk, and a No. 1 coil spring in a compressed state is placed in the area below the No. 1 movable plate.

[0011] Preferably, the distance between the hemispherical protrusion structure and the axis line of the lower rotating disk is half of the radius of the lower rotating disk structure, and the distance between the hemispherical protrusion structure and the axis line of the lower rotating disk is consistent with the distance between the hemispherical groove structure and the axis line of the upper rotating disk.

[0012] Preferably, the structural radius of the hemispherical protrusion structure matches the structural radius of the hemispherical groove structure, and the depth of the hemispherical groove structure is smaller than the structural radius of the hemispherical protrusion structure.

[0013] Preferably, the structural shape of the cross section of the movable cavity of component No. 1 is consistent with the structural shape of the cross section of the movable plate No. 1, both are polygonal structures, and the structural dimensions of the cross section of the movable cavity of component No. 1 match the structural dimensions of the cross section of the movable plate No. 1.

[0014] Preferably, it also includes an adjustable limiting mechanism, which includes an outer hollow sleeve, the upper end surface of the outer hollow sleeve is provided with a fixing ring structure which is an integral structure therewith and fixedly mounted on the bottom surface of the workbench, the interior of the outer hollow sleeve is provided with an annular component installation cavity with an open bottom end and a top end connected to a component placement opening, the outer hollow sleeve is provided with a rotatable inner rotating column installed inside the annular component installation cavity through a bearing, the bottom end of the inner rotating column is provided with a No. 2 rotating cap which is an integral structure therewith, the top end of the inner rotating column is provided with a driven plate which is an integral structure therewith and located inside the component placement opening, the axis centerline of the driven plate and the axis centerline of the positioning pin are on the same vertical plane.

[0015] Preferably, the upper end surface of the driven plate is equipped with two limiting columns in opposing states, the circumferential surface of the inner rotating column is provided with a plurality of annular array-type component insertion grooves, the outer circumferential surface of the outer hollow sleeve is provided with a transverse protrusion structure of an integrated structure, a No. 3 component active cavity is provided inside the transverse protrusion structure, a No. 3 component through hole connecting the annular component installation cavity and one end surface of the No. 3 component active cavity is provided at the wall thickness of the outer hollow sleeve, and a No. 4 component through hole connecting the external space and the other end of the No. 3 component active cavity is provided on one end surface of the transverse protrusion structure. The transverse protrusion structure is provided with a No. 2 movable plate capable of axially moving along the movable cavity of component No. 3, inside the movable cavity of component No. 3, an insertion limit rod is fixedly installed on one end face of the No. 2 movable plate, which passes through the through hole of component No. 3 and can be inserted into the corresponding component insertion groove, and a transverse push-pull rod passing through the through hole of component No. 4 is fixedly installed on the other end of the No. 2 movable plate, and a No. 2 coil spring in a compressed state is placed on the outer periphery of the rod body of the transverse push-pull rod located inside the movable cavity of component No. 3, and a push-pull plate is fixedly installed on the end of the transverse push-pull rod.

[0016] Compared with the prior art, the present invention provides a bending machine for metal tube bending, which has the following beneficial effects:

[0017] This metal tube bending machine is used for bending.

[0018] 1. The bending radius of the equipment can be adjusted according to the diameter of the steel pipe to be bent, so that the diameter of the pipe matches the bending radius of the equipment, so that the inner structure and the outer structure of the pipe in the bending area are in contact with the corresponding structure to ensure that the bending effect of the steel pipe at the bending part is more accurate. In addition, the device can prevent the drive motor from being damaged due to excessive bending resistance, so as to improve the protection capability of the drive motor.

[0019] 2. By setting an adjustable resistance mechanism and rotating the No. 1 rotating cap, the external threaded rod will be driven to rotate. Due to the existence of the threaded structure, the external threaded rod will drive the L-shaped telescopic rod to move laterally, thereby changing the distance between the sliding sleeve body and the locating pin. The distance between the sliding sleeve body and the locating pin is consistent with the structural diameter of the pipe body of the bent steel pipe, which can achieve a more precise bending effect.

[0020] 3. By setting up a rotating driven mechanism, when the torque resistance in the bending process is greater than the maximum torque strength formed by the No. 1 coil spring, the hemispherical protrusion structure will exit the hemispherical groove structure. At this time, the rotor can normally drive the longitudinal hollow shell to rotate, and the upper rotating disk will not continue to rotate with the lower rotating disk, so that the sliding sleeve will not continue to produce the effect of circular motion, thereby preventing the drive motor from being damaged due to excessive bending resistance, so as to improve the protection capability of the drive motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A perspective view of the present invention;

[0022] Figure 2 It is a three-dimensional cross-sectional view of the present invention in the main viewing direction;

[0023] Figure 3 It is a three-dimensional cross-sectional view of the present invention in the right viewing direction;

[0024] Figure 4 It is a three-dimensional diagram of the adjustable interference mechanism in the present invention;

[0025] Figure 5 It is a three-dimensional cross-sectional view of the adjustable interference mechanism of the present invention;

[0026] Figure 6 is a three-dimensional cross-sectional view of the rotary driven mechanism of the present invention;

[0027] Figure 7 A three-dimensional view of the present invention near the first movable plate and the lower rotating disk;

[0028] Figure 8 It is a three-dimensional cross-sectional view of the adjustable limiting mechanism of the present invention;

[0029] Fig. 9 It is a three-dimensional view of the present invention near the inner rotating column.

[0030] Among them: 1. workbench; 2. support leg; 3. component placement opening; 4. positioning pin; 5. bottom fixing plate; 6. drive motor; 7. drive motor mounting shell; 8. rotor; 9. adjustable interference mechanism; 91. horizontal hollow shell; 92. fixing ring body; 93. L-shaped fixing bracket; 94. shaft body fixing hole; 95. internal thread cavity; 96. No. 1 component through hole; 97. thread structure; 98. external thread rod; 99. No. 1 rotating cap; 910. L-shaped telescopic rod; 911. sliding sleeve body; 10. rotating driven mechanism; 101. longitudinal hollow shell; 102. component fixing groove; 103. No. 1 component movable cavity; 104. No. 2 component through hole; 105. No. 2 component movable cavity; 106. No. 1 movable plate; 107. No. 1 spiral spring ;108, driven shaft;109, lower rotating disk;1010, hemispherical protrusion structure;1011, upper rotating disk;1012, hemispherical groove structure;1013, protruding fixed shaft;11, adjustable limiting mechanism;111, outer hollow sleeve;112, fixed ring structure;113, annular component installation cavity;114, inner rotating column;115, component insertion groove;116, No. 2 rotating cap;117, driven plate;118, limiting column;119, horizontal protrusion structure;1110, No. 3 component movable cavity;1111, No. 3 component perforation;1112, No. 4 component perforation;1113, No. 2 movable plate;1114, insert limiting rod;1115, horizontal push-pull rod;1116, push-pull plate;1117, No. 2 coil spring. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1 , Figure 2 and Figure 3 A bending machine for metal tube bending includes a workbench 1 with a plurality of supporting legs 2 installed at the bottom, a component placement port 3 arranged in the workbench 1, a positioning pin 4 fixedly installed at the upper end of the workbench 1, a bottom fixing plate 5 fixedly installed at the bottom of two supporting legs 2, and a driving motor 6 fixedly installed on the upper surface of the bottom fixing plate 5 through a driving motor mounting shell 7. The power of the driving motor 6 is used as the power source required for bending. Therefore, the driving motor 6 needs to use a servo motor that can control the rotation angle. By controlling the rotation angle of a single rotor 8, the bending angle of the steel tube can be controlled.

[0033] To achieve a bend radius with adjustable distance, see Figure 1 , Figure 3 , Figure 4 and Figure 5 , it is necessary to set up an adjustable resistance mechanism 9, which is provided with a horizontal hollow shell 91 located on one side of the workbench 1 and can indirectly rotate with the rotor 8 of the drive motor 6, an L-shaped telescopic rod 910 whose partial structure is located inside the horizontal hollow shell 91 and can move horizontally, and a sliding sleeve body 911 installed on the outer periphery of the longitudinal rod body of the L-shaped telescopic rod 910 and cooperates with the positioning pin 4 to bend the steel pipe, so that one end of the steel pipe is placed on the sliding sleeve body 911 and the positioning pin 4, and then, the No. 1 rotating cap 99 is rotated. At this time, the external threaded rod 98 will be driven to rotate. Due to the existence of the threaded structure 97, the external threaded rod 98 will drive the L-shaped telescopic rod 910 to move laterally, thereby changing the distance between the sliding sleeve body 911 and the positioning pin 4, so that the distance between the sliding sleeve body 911 and the positioning pin 4 is consistent with the structural diameter of the pipe body of the bent steel pipe, which can achieve a more precise bending effect.

[0034] For the specific structure of the adjustable interference mechanism 9, please refer to Figure 4 and Figure 5 , including a horizontal hollow shell 91 located on one side of the workbench 1, a fixing ring body 92 is fixedly installed on the outer circumferential surface of the horizontal hollow shell 91, an L-shaped fixing bracket 93 is fixedly installed on the bottom of the fixing ring body 92, and an axial fixing hole 94 is arranged inside the L-shaped fixing bracket 93, and an internal thread cavity 95 with an end in an open state is arranged inside the end of the horizontal hollow shell 91 facing away from the positioning pin 4, and a No. 1 component through hole 96 connecting the external space and the solid end surface of the internal thread cavity 95 is arranged on the end surface of the horizontal hollow shell 91 facing the positioning pin 4, and an external thread rod 98 is installed on the internal thread cavity 95 of the horizontal hollow shell 91 through a thread structure 97. Specifically, the thread structure 97 includes an internal thread structure arranged inside the internal thread cavity 95 and an external thread structure arranged on the rod body of the external thread rod 98, And the internal thread structure matches the external thread structure, the external thread rod 98 is fixedly installed with a No. 1 rotating cap 99 at one end located outside the internal thread cavity 95, and the external thread rod 98 is installed with a relatively rotatable L-shaped telescopic rod 910 through a bearing at one end located inside the internal thread cavity 95. In order to achieve the transmission of the rotation effect, it is necessary to make the structural shape of the cross section of the L-shaped telescopic rod 910 consistent with the structural shape of the cross section of the No. 1 component through-hole 96, both of which are polygonal structures, and the structural dimensions of the cross section of the L-shaped telescopic rod 910 match the structural dimensions of the cross section of the No. 1 component through-hole 96, the transverse rod body of the L-shaped telescopic rod 910 passes through the No. 1 component through-hole 96, and the bottom of the longitudinal rod body of the L-shaped telescopic rod 910 is installed with a rotatable sliding sleeve body 911 through a bearing, and the sliding sleeve body 911 is located around the positioning pin 4.

[0035] In order to prevent the driving motor 6 from being damaged due to excessive bending resistance and to improve the protection capability of the driving motor 6, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 , it is necessary to set up a rotary driven mechanism 10, which is provided with a longitudinal hollow shell 101 that can rotate with the rotor 8, a lower rotating disk 109 that can rotate with the longitudinal hollow shell 101 and can move longitudinally inside the longitudinal hollow shell 101, and an upper rotating disk 1011 that can rotate with the lower rotating disk 109 and can drive the horizontal hollow shell 91 to rotate. When the drive motor 6 is started, the rotor 8 will indirectly drive the sliding sleeve body 911 to rotate, and the sliding sleeve body 911 will produce a circular motion around the axis of the positioning pin 4, so that the steel pipe is bent. During the bending process, the rotation of the drive motor 6 will be transmitted to Between the hemispherical protrusion structure 1010 and the hemispherical groove structure 1012, when the torque resistance during the bending process is greater than the maximum torque strength formed by the No. 1 coil spring 107, the hemispherical protrusion structure 1010 will exit the hemispherical groove structure 1012. At this time, the rotor 8 can normally drive the longitudinal hollow shell 101 to rotate, and the upper rotating disk 1011 will not continue to rotate with the lower rotating disk 109, so that the sliding sleeve body 911 will not continue to produce the effect of circular motion, thereby preventing the drive motor 6 from being damaged due to excessive bending resistance, thereby improving the protection capability of the drive motor 6.

[0036] For the specific structure of the rotary driven mechanism 10, please refer to Figure 6 and Figure 7, comprising a longitudinal hollow shell 101, a component fixing groove 102 for fixing and installing the rotor 8 is provided at the bottom end of the longitudinal hollow shell 101, a component movable cavity 103 is provided inside the longitudinal hollow shell 101, a component through hole 104 is provided at the top of the component movable cavity 103, a component movable cavity 105 with a top end in an open state is provided at the top of the component through hole 104, and a component movable cavity 105 with a top end in an open state is provided at the top of the component movable cavity 103. The longitudinal hollow shell 101 is provided with a component movable cavity 105 with a top end in an open state at the top of the component through hole 104. 03 axially movable plate 106, in order to realize the transmission of the rotation effect, it is necessary to make the structural shape of the cross section of the movable cavity 103 of the No. 1 component consistent with the structural shape of the cross section of the movable plate 106, both of which are polygonal structures, and the structural dimensions of the cross section of the movable cavity 103 of the No. 1 component match the structural dimensions of the cross section of the movable plate 106, the upper end surface of the movable plate 106 is fixedly installed with a driven shaft 108 that passes through the through hole 104 of the No. 2 component, and the driven shaft 108 is fixedly installed at the top of the movable cavity 105 of the No. 2 component with a lower rotating shaft that can move axially along the movable cavity 105 of the No. 2 component. The upper end surface of the lower rotating disk 109 is provided with a plurality of hemispherical protrusion structures 1010 which are integrally formed therewith, the longitudinal hollow shell 101 is provided with a rotatable upper rotating disk 1011 through a bearing inside the movable cavity 105 of the second component, the lower end surface of the upper rotating disk 1011 is provided with a plurality of hemispherical groove structures 1012 which can be clamped on the periphery of the top area of ​​the hemispherical protrusion structure 1010, the distance between the hemispherical protrusion structure 1010 and the axis line of the lower rotating disk 109 is half of the structure radius of the lower rotating disk 109, and the hemispherical protrusion structure 1010 and the lower rotating disk 109 are spaced apart from each other. The distance between the axis lines of the lower rotating disk 109 is consistent with the distance between the axis lines of the hemispherical groove structure 1012 and the upper rotating disk 1011, the structural radius of the hemispherical protrusion structure 1010 matches the structural radius of the hemispherical groove structure 1012, and the depth of the hemispherical groove structure 1012 is smaller than the structural radius of the hemispherical protrusion structure 1010, and the upper end surface of the upper rotating disk 1011 is provided with a protruding fixed shaft 1013 which is an integral structure with it and fixedly installed inside the shaft fixing hole 94, and the area below the No. 1 movable plate 106 is provided with a No. 1 coil spring 107 in a compressed state.

[0037] In order to make the tail end of the steel pipe in a more stable and limited state, thereby preventing the negative impact caused by mechanical vibration at the tail end of the steel pipe, please refer to Figure 1 , Figure 2 , Figure 7 and Figure 8, it is necessary to set an adjustable limiting mechanism 11, the adjustable limiting mechanism 11 includes an outer hollow sleeve 111, the upper end surface of the outer hollow sleeve 111 is provided with a fixed ring structure 112 which is an integral structure with it and fixedly installed on the bottom surface of the workbench 1, the inner part of the outer hollow sleeve 111 is provided with an annular component installation cavity 113 with an open bottom end and a top end connected to the component placement port 3, the outer hollow sleeve 111 is provided with a rotatable inner rotating column 114 through a bearing inside the annular component installation cavity 113, the bottom end of the inner rotating column 114 is provided with a No. 2 rotating cap 116 which is an integral structure with it, and the top end of the inner rotating column 114 is provided with a No. 2 rotating cap 116 which is an integral structure with it and is located in the component placement port 3 The driven plate 117 of the inner part has an axis line of the driven plate 117 and an axis line of the positioning pin 4 in the same vertical plane, the upper end surface of the driven plate 117 is provided with two opposing limit columns 118, the circumferential surface of the inner rotating column 114 is provided with a plurality of annular array-type component insertion grooves 115, the outer circumferential surface of the outer hollow sleeve 111 is provided with an integrated structure of the transverse protrusion structure 119, the interior of the transverse protrusion structure 119 is provided with a No. 3 component active cavity 1110, the wall thickness of the outer hollow sleeve 111 is provided with a No. 3 component through hole 1111 connecting the annular component installation cavity 113 and one end surface of the No. 3 component active cavity 1110, and one end surface of the transverse protrusion structure 119 is provided with a connecting The outer space and the No. 4 component through hole 1112 at the other end of the No. 3 component movable cavity 1110, the transverse protrusion structure 119 is provided with a No. 2 movable plate 1113 capable of axially moving along the No. 3 component movable cavity 1110, one end face of the No. 2 movable plate 1113 is fixedly installed with an insertion limit rod 1114 that passes through the No. 3 component through hole 1111 and can be inserted into the corresponding component insertion groove 115, the other end of the No. 2 movable plate 1113 is fixedly installed with a transverse push-pull rod 1115 that passes through the No. 4 component through hole 1112, the transverse push-pull rod 1115 is placed on the outer periphery of the rod body located inside the No. 3 component movable cavity 1110. The No. 2 coil spring 1117, the end of the transverse push-pull rod 1115 is fixedly installed with a push-pull plate 1116, the tail of the steel pipe is clamped between the two limit columns 118, and then the head of the steel pipe is clamped between the sliding sleeve body 911 and the positioning pin 4, the push-pull plate 1116 is pulled outward, so that the insertion limit rod 1114 is disengaged from the corresponding component insertion groove 115, and then the No. 2 rotating cap 116 is rotated, so that the opposite sides of the two limit columns 118 can be in contact with the symmetrical tube body of the steel pipe, and then the push-pull plate 1116 is released. Under the elastic action of the No. 2 coil spring 1117, the insertion limit rod 1114 will be reinserted into the new component insertion groove 115, so that the tail of the steel pipe is more accurately limited.

[0038] The specific working principle of the present invention is to clamp the tail of the steel pipe between the two limit columns 118, and then clamp the head of the steel pipe between the sliding sleeve body 911 and the positioning pin 4, pull the push-pull plate 1116 outward, so that the insertion limit rod 1114 is separated from the corresponding component insertion groove 115, and then rotate the second rotating cap 116 so that the opposite sides of the two limit columns 118 can contact the symmetrical tube body of the steel pipe, and then release the push-pull plate 1116. Under the elastic action of the second coil spring 1117, the insertion limit rod 1114 will be reinserted into the new component insertion groove 115;

[0039] The No. 1 rotating cap 99 is rotated, and the external threaded rod 98 is driven to rotate. Due to the existence of the threaded structure 97, the external threaded rod 98 drives the L-shaped telescopic rod 910 to move laterally, thereby changing the distance between the sliding sleeve body 911 and the positioning pin 4, so that the distance between the sliding sleeve body 911 and the positioning pin 4 is consistent with the structural diameter of the tube body of the bent steel tube;

[0040] Start the drive motor 6, the rotor 8 will indirectly drive the sliding sleeve body 911 to rotate, and the sliding sleeve body 911 will produce a circular motion around the axis of the positioning pin 4, so that the steel pipe is bent. When the bending angle reaches the requirement, turn off the drive motor 6 and reset the sliding sleeve body 911 to the initial working state.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bending machine for bending a metal tube, comprising a workbench (1) with a plurality of supporting legs (2) mounted on the bottom, a component placement opening (3) arranged in the workbench (1), a positioning pin (4) fixedly mounted on the upper end of the workbench (1), a bottom fixing plate (5) fixedly mounted on the bottoms of two supporting legs (2), and a driving motor (6) fixedly mounted on the upper surface of the bottom fixing plate (5) via a driving motor mounting housing (7), characterized in that: Also includes, An adjustable resistance mechanism (9) is provided inside thereof with a horizontal hollow housing (91) located on one side of the workbench (1) and capable of rotating indirectly with the rotor (8) of the drive motor (6), an L-shaped telescopic rod (910) with a portion of its structure located inside the horizontal hollow housing (91) and capable of horizontal movement, and a sliding sleeve body (911) installed on the outer periphery of the longitudinal rod body of the L-shaped telescopic rod (910) and cooperating with the positioning pin (4) to bend the steel pipe; and a rotary driven mechanism (10), wherein a longitudinal hollow housing (101) capable of rotating with the rotor (8), a lower rotating disk (109) capable of rotating with the longitudinal hollow housing (101) and capable of longitudinal movement within the longitudinal hollow housing (101), and an upper rotating disk (1011) capable of rotating with the lower rotating disk (109) and capable of driving the horizontal hollow housing (91) to rotate; The adjustable interference mechanism (9) comprises a horizontal hollow shell (91) located on one side of the workbench (1), a fixing ring body (92) being fixedly mounted on the outer circumferential surface of the horizontal hollow shell (91), an L-shaped fixing bracket (93) being fixedly mounted on the bottom of the fixing ring body (92), an axial fixing hole (94) being arranged inside the L-shaped fixing bracket (93), an internal threaded cavity (95) having an end in an open state being arranged inside the end of the horizontal hollow shell (91) facing away from the positioning pin (4), a No. 1 component through hole (96) being arranged on the end surface of the horizontal hollow shell (91) facing the positioning pin (4) and connecting the external space with the solid end surface of the internal threaded cavity (95), and the horizontal An external threaded rod (98) is installed in the hollow housing (91) via a threaded structure (97) inside the internal threaded cavity (95); a No. 1 rotating cap (99) is fixedly installed on one end of the external threaded rod (98) located outside the internal threaded cavity (95); an L-shaped telescopic rod (910) capable of relative rotation is installed on one end of the external threaded rod (98) located inside the internal threaded cavity (95) via a bearing; the transverse rod body of the L-shaped telescopic rod (910) passes through the No. 1 component through-hole (96); a rotatable sliding sleeve body (911) is installed at the bottom of the longitudinal rod body of the L-shaped telescopic rod (910) via a bearing, and the sliding sleeve body (911) is located around the positioning pin (4); The rotary driven mechanism (10) comprises a longitudinal hollow shell (101), the bottom end of which is provided with a component fixing groove (102) for fixing and installing a rotor (8), a component movable cavity (103) is provided inside the longitudinal hollow shell (101), a component through hole (104) is provided at the top end of the component movable cavity (103), a component movable cavity (105) with an open top end is provided at the top end of the component through hole (104), a component movable cavity (106) is arranged inside the component movable cavity (103) and is capable of axial movement along the component movable cavity (103), a driven shaft (108) is fixedly installed on the upper end surface of the component movable cavity (106) and passes through the component through hole (104), and the driven shaft (108) is fixedly installed on the upper end surface of the component movable cavity (103). The movable shaft (108) is fixedly mounted with a lower rotating disk (109) capable of axial movement along the movable cavity (105) of the No. 2 component at the top end of the movable cavity (105) of the No. 2 component, and the upper end surface of the lower rotating disk (109) is provided with a plurality of hemispherical protrusion structures (1010) integrally formed therewith, and the longitudinal hollow housing (101) is provided with a rotatable upper rotating disk (1011) via a bearing inside the movable cavity (105) of the No. 2 component, and the lower end surface of the upper rotating disk (1011) is provided with a plurality of hemispherical groove structures (1012) capable of being clamped on the periphery of the top area of ​​the hemispherical protrusion structures (1010), and the upper end surface of the upper rotating disk (1011) is provided with a protruding fixed shaft (1013) integrally formed therewith and fixedly mounted inside the shaft body fixing hole (94), and a No. 1 coil spring (107) in a compressed state is placed in the area below the No. 1 movable plate (106); The invention also comprises an adjustable limiting mechanism (11), wherein the adjustable limiting mechanism (11) comprises an outer hollow sleeve (111), the upper end surface of the outer hollow sleeve (111) being provided with a fixed ring structure (112) which is an integral structure with the outer hollow sleeve (111) and fixedly mounted on the bottom surface of the workbench (1), the interior of the outer hollow sleeve (111) being provided with an annular component installation cavity (113) whose bottom end is open and whose top end is connected to the component placement opening (3), the outer hollow sleeve (111) being provided with a rotatable inner rotating column (114) via a bearing inside the annular component installation cavity (113), the bottom end of the inner rotating column (114) being provided with a No. 2 rotating cap (116) which is an integral structure with the outer hollow sleeve, the top end of the inner rotating column (114) being provided with a driven plate (117) which is an integral structure with the inner rotating column (114) and is located inside the component placement opening (3), the axis of the driven plate (117) being located on the same vertical plane as the axis of the positioning pin (4).

2. A metal tube bending machine according to claim 1, characterized in that: The structural shape of the cross section of the L-shaped telescopic rod (910) is consistent with the structural shape of the cross section of the through hole (96) of the first component, both of which are polygonal structures, and the structural dimensions of the cross section of the L-shaped telescopic rod (910) match the structural dimensions of the cross section of the through hole (96) of the first component.

3. A metal tube bending machine according to claim 1, characterized in that: The thread structure (97) comprises an internal thread structure arranged inside the internal thread cavity (95) and an external thread structure arranged on the rod body of the external thread rod (98), and the internal thread structure matches the external thread structure.

4. A metal tube bending machine according to claim 1, characterized in that: The distance between the hemispherical protrusion structure (1010) and the axis line of the lower rotating disk (109) is half of the structure radius of the lower rotating disk (109), and the distance between the hemispherical protrusion structure (1010) and the axis line of the lower rotating disk (109) is consistent with the distance between the hemispherical groove structure (1012) and the axis line of the upper rotating disk (1011).

5. A metal tube bending machine according to claim 4, characterized in that: The structural radius of the hemispherical protrusion structure (1010) matches the structural radius of the hemispherical groove structure (1012), and the depth of the hemispherical groove structure (1012) is smaller than the structural radius of the hemispherical protrusion structure (1010).

6. A metal tube bending machine according to claim 1, characterized in that: The structural shape of the cross section of the movable cavity (103) of the first component is consistent with the structural shape of the cross section of the first movable plate (106), both of which are polygonal structures, and the structural dimensions of the cross section of the movable cavity (103) of the first component match the structural dimensions of the cross section of the first movable plate (106).

7. A metal tube bending machine according to claim 1, characterized in that: The upper end surface of the driven plate (117) is provided with two limiting columns (118) in an opposing state, the circumferential surface of the inner rotating column (114) is provided with a plurality of annular array-type component insertion grooves (115), the outer circumferential surface of the outer hollow sleeve (111) is provided with an integrated transverse protrusion structure (119), the interior of the transverse protrusion structure (119) is provided with a No. 3 component active cavity (1110), the wall thickness of the outer hollow sleeve (111) is provided with a No. 3 component through hole (1111) connecting the annular component installation cavity (113) and one end surface of the No. 3 component active cavity (1110), one end surface of the transverse protrusion structure (119) is provided with a No. 4 component through hole (1112) connecting the external space and the other end of the No. 3 component active cavity (1110), the transverse protrusion structure (119) is provided with a plurality of component insertion grooves (115) in an annular array-type component insertion grooves (115), the outer circumferential surface of the outer hollow sleeve (111) is provided with an integrated transverse protrusion structure (119), the interior of the transverse protrusion structure (119) is provided with a No. 3 component active cavity (1110), the wall thickness of the outer hollow sleeve (111) is provided with a No. 4 component through hole (1112) connecting the external space and the other end of the No. 3 component active cavity (1110), the transverse protrusion structure (119) is provided with a plurality of component insertion grooves (115) in annular array-type component insertion grooves (115), the outer circumferential surface of the inner rotating column (114) is provided with a plurality of component insertion grooves (115) in annular array-type component insertion grooves (115), the outer circum 19) A second movable plate (1113) capable of axially moving along the movable cavity (1110) of the third component is arranged inside the movable cavity (1110) of the third component, an insertion limit rod (1114) penetrating the through hole (1111) of the third component and capable of being inserted into the corresponding component insertion groove (115) is fixedly installed on one end face of the second movable plate (1113), a transverse push-pull rod (1115) penetrating the through hole (1112) of the fourth component is fixedly installed on the other end of the second movable plate (1113), a second coil spring (1117) in a compressed state is placed on the outer periphery of the rod body of the transverse push-pull rod (1115) inside the movable cavity (1110) of the third component, and a push-pull plate (1116) is fixedly installed on the end of the transverse push-pull rod (1115).

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