A metal pipe bending device for construction machinery

Abstract

The present invention relates to the technical field of metal pipe processing, and specifically, to a metal pipe bending device for construction machinery. It includes a bending device body, and the bending device body includes a workbench. A power mechanism is installed on one side of the workbench. The power mechanism includes a wheel table mounting plate and a pressure roller table. The mandrel body includes a fixed end group, a filling end group, and an extension end group, and the fixed end group, the filling end group, and the extension end group are connected in sequence. By designing the mandrel body into a fixed end group, a filling end group, and an extension end group, and in a structure connected in sequence, when performing metal pipe bending assembly, the filling end group can be completely filled inside the metal pipe. During the metal pipe bending process, the extension end group fits with the filling end group, so the filling end group can follow the metal pipe to be bent together. At the same time, the extension end group extends the metal pipe and limits the filling end group.

Description

Technical Field

[0001] The present invention relates to the technical field of metal pipe processing, and more specifically, to a metal pipe bending device for construction machinery. Background Art

[0002] In the field of construction machinery, the bending of short metal pipes has extremely wide applications. Taking the hydraulic system as an example, the connection of many internal components often relies on short pipes. Since the hydraulic system usually needs to be installed in a limited and complex space, the short pipes need to be bent to achieve precise docking between different components and ensure the smooth transportation of hydraulic oil.

[0003] However, when bending short metal pipes, the problem of uneven stress is extremely prominent, which is very likely to cause deformation of the metal pipes. At present, the industry mainly uses two methods, sand injection and mandrel filling, to alleviate this problem. In terms of the sand injection method, its operation process is quite cumbersome. First, special equipment is needed to fill the sand into the metal pipe and compact it. This process not only takes a lot of time, but also requires sand cleaning work after the bending operation. And the sand is easily attached to the inner wall of the pipe, and the cleaning difficulty is extremely high. Once the cleaning is not thorough, the remaining sand will flow with the medium in the pipeline, which is very likely to block the precision components in the system, and then seriously affect the normal operation of the entire system.

[0004] On the contrary, although the mandrel filling method can reduce the deformation of the metal pipe during bending to a certain extent, due to the limitations of the mandrel's own structural characteristics, it is usually inserted in the middle of the metal pipe, which is inconvenient to achieve complete filling of the metal pipe. During the bending process, in those areas not filled by the mandrel, the inner wall of the metal pipe lacks sufficient support. When the metal pipe is subjected to an external bending force, the stress in these unsupported areas is difficult to effectively disperse, and it is very easy to produce deformation phenomena such as wrinkles and depressions due to stress concentration. Summary of the Invention

[0005] The present invention provides a metal pipe bending device for construction machinery. By improving the mandrel body, the mandrel body is divided into three parts: a fixed end group, a filling end group, and an extension end group. During the bending process of the metal pipe, the extension end group can extend the bending end of the metal pipe, while the filling end group can provide stable support inside the metal pipe, thus solving the problems raised in the above background art, that is:

[0006] The stress of short metal pipes is easily uneven during bending, and the common mandrel filling method cannot achieve complete filling.

[0007] To achieve the above object, the laser cutting machine includes a bending device body, the bending device body includes a workbench, and two tracks are installed on the surface of the workbench, and a moving skateboard is slidably arranged on the surfaces of the two tracks;

[0008] On one side of the workbench, a power mechanism is installed. On the surface of the moving slide plate, a mandrel body is installed, and the mandrel body extends towards the power mechanism side.

[0009] A clamping member is installed between the moving slide plate and the power mechanism, and the clamping member is located on the surface of the workbench.

[0010] The power mechanism includes a wheel table mounting plate and a pressure roller table. On the top of the wheel table mounting plate, a bending die is installed, and the pressure roller table rotates following the bending die to cooperate with the bending die to perform bending operations on the metal tube.

[0011] The mandrel body includes a fixed end group, a filling end group, and an extension end group, and the fixed end group, the filling end group, and the extension end group are connected in sequence.

[0012] During the bending and assembly of the metal tube, the filling end group is completely filled inside the metal tube, and when the metal tube is bent, it bends together with the metal tube. During the bending process, the extension end group fits with the filling end group to achieve the extension of the metal tube and limit the filling end group.

[0013] In the above technical solution, because the mandrel body is designed as a fixed end group, a filling end group, and an extension end group, and is a structure connected in sequence. When performing the bending and assembly of the metal tube, the filling end group can be completely filled inside the metal tube. During the bending process of the metal tube, the extension end group fits with the filling end group, so the filling end group can bend together with the metal tube, and at the same time, the extension end group realizes the extension of the metal tube and limits the filling end group.

[0014] On this basis, the filling end group includes a first metal end, a bending end rod, and a second metal end, and the first metal end, the bending end rod, and the second metal end are fixedly connected in sequence.

[0015] Further, the extension end group includes a sleeve rod, the sleeve rod can be sleeved on the end of the metal tube to be bent, an inner rod is arranged in the middle of the sleeve rod, and the sleeve rod and the inner rod are connected by threads.

[0016] On the surface of the second metal end away from the bending end rod, a plug-in limit groove is opened, and the inner wall of the plug-in limit groove fits with the end of the inner rod.

[0017] An inner pad is fixedly installed on the inner wall of the sleeve rod, and the inner pad is made of an elastic material.

[0018] In this technical solution, by setting the filling end group as the first metal end, the bent end rod, and the second metal end connected in sequence, during the bending and assembly of the metal tube, the bent end rod can be completely filled inside the metal tube and bend along with it when the metal tube is bent; in addition, the sleeve rod of the extension end group can be sleeved on the end of the metal tube. The inner rod in the middle of the sleeve rod is threadedly connected to the sleeve rod, and the end of the inner rod fits against the inner wall of the insertion limiting groove of the second metal end. The elastic inner pad on the inner wall of the sleeve rod can better fit the metal tube, thereby realizing the extension of the metal tube and limiting the filling end group.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] By setting the mandrel body as three parts: the fixed end group, the filling end group, and the extension end group, the quality and stability of the metal tube bending operation are improved. Among them, the bent end rod in the filling end group is composed of an elastic member, an elastic inner tube, and a leather outer tube from the inside to the outside. During the bending process of the metal tube, this structure enables the bent end rod to fill inside the metal tube, ensuring that all parts of the metal tube can obtain uniform support in the entire bending process in multiple directions, effectively reducing problems such as deformation and wrinkles caused by uneven internal filling, and improving the bending quality.

[0021] At the same time, the extension end group can extend the bent end of the short metal tube after the metal tube is sleeved, work in cooperation with the filling end group, and firmly extend the metal tube by means of a double fixation method. During the bending operation, the extension end group increases the effective length of the metal tube, making the operation more convenient. At the same time, it changes the stress distribution of the metal tube. For a metal tube that is difficult to be uniformly stressed due to length limitations, after extension, it can obtain a more reasonable stress distribution during the bending process, reduce the stress concentration in local areas, and reduce the risk of the metal tube breaking or being overly deformed at the bending point, providing a solid guarantee for the smooth progress of the bending operation and the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the socketing structure of the metal tube before bending in the embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the metal tube during the bending process in the embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of the disassembly structure of the metal tube after bending in the embodiment of the present invention;

[0026] Figure 5 It is a top view of the bending equipment body in the embodiment of the present invention;

[0027] Figure 6Front view of the bending equipment body according to an embodiment of the present invention;

[0028] Figure 7 Schematic structural diagram of the mandrel body according to an embodiment of the present invention;

[0029] Figure 8 Schematic exploded view of the filling end group according to an embodiment of the present invention;

[0030] Figure 9 Schematic sectional view of the bending end according to an embodiment of the present invention;

[0031] Figure 10 Schematic installation structure diagram of the extension end group according to an embodiment of the present invention;

[0032] Figure 11 For the present invention Figure 10 Schematic diagram of the structure at position A.

[0033] The meanings of each label in the figure are as follows:

[0034] 1. Bending equipment body; 11. Workbench; 12. Track; 13. Moving slide; 14. Bending die; 15. Clamping member;

[0035] 2. Power mechanism; 21. Compressed roller table; 22. Gear set; 23. Right-angle coupling box; 24. Vertical plate; 25. Roller table mounting plate; 26. Transmission structure;

[0036] 3. Mandrel body; 30. Mounting component; 31. Fixed end group; 32. Filling end group; 33. Extension end group;

[0037] 311. Fixed end rod; 312. Installation groove; 321. First metal end; 322. Bending end rod; 323. Second metal end; 324. Replacement connecting end rod; 331. Sleeve rod; 332. Inner rod; 333. Insertion limit groove;

[0038] 41. Cortical outer tube; 42. Elastic inner tube; 43. Elastic member; 44. Outer coating;

[0039] 5. Inner pad. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] At present, for the problem that during the bending operation of short metal pipes, the stress is prone to be uneven when bending short metal pipes, and the commonly used mandrel filling method cannot achieve complete filling, the present invention provides a metal pipe bending device for construction machinery. Refer to Figures 1 - 5 As shown, it includes a bending device body 1. The bending device body 1 includes a workbench 11. Two tracks 12 are installed on the surface of the workbench 11. A moving slide plate 13 is slidably arranged on the surfaces of the two tracks 12;

[0042] One side of the workbench 11 is installed with a power mechanism 2. A mandrel body 3 is installed on the surface of the moving slide plate 13, and the mandrel body 3 extends towards the power mechanism 2; A clamping member 15 is installed between the moving slide plate 13 and the power mechanism 2, and the clamping member 15 is located on the surface of the workbench 11; The power mechanism 2 includes a wheel table mounting plate 25 and a pressure roller table 21. A bending die 14 is installed on the top of the wheel table mounting plate 25. The pressure roller table 21 rotates following the bending die 14 to cooperate with the bending die 14 to perform a bending operation on the metal pipe; The mandrel body 3 includes a fixed end group 31, a filling end group 32, and an extension end group 33, and the fixed end group 31, the filling end group 32, and the extension end group 33 are connected in sequence;

[0043] During the bending assembly of the metal pipe, the filling end group 32 is completely filled inside the metal pipe, and when the metal pipe is bent, it bends together with the metal pipe. During the bending process, the extension end group 33 fits with the filling end group 32 to realize the extension of the metal pipe and limit the filling end group 32.

[0044] In the bending device body 1, the power mechanism 2 is used to provide power support for bending the metal pipe. First, the specific structure of the power mechanism 2 is disclosed. The wheel table mounting plate 25 is fixedly installed on the side wall of the workbench 11. A bearing seat is installed on the surface of the wheel table mounting plate 25. The central axis of the pressure roller table 21 is located inside the bearing seat. The bending die 14 is fixedly connected to the top of the central axis of the pressure roller table 21;

[0045] A gear set 22 is fixedly installed at the bottom of the central axis of the pressure roller table 21. The gear set 22 includes a large gear and a small gear that are meshed and connected. The large gear is connected to the pressure roller table 21, and the small gear is rotatably arranged at the bottom of the workbench 11. And the other end of the small gear is connected to one of the drive shafts of a right-angle coupling box 23;

[0046] A vertical plate 24 is fixedly installed at the bottom of the workbench 11. The right-angle coupling box 23 is fixedly installed on the surface of the vertical plate 24. The other end of the right-angle coupling box 23 is connected to a transmission structure 26, and the other end of the transmission structure 26 is fixedly connected to the output shaft of the motor. The motor is fixedly installed at the bottom of the workbench 11.

[0047] Refer to Figure 2 And in combination with Figure 3 and Figure 6As shown in the figure, when bending a metal tube, first, the metal tube is sleeved on the surface of the mandrel body 3, and it is ensured that the metal tube is located in the inner groove of the bending die 14. After the metal tube is sleeved, the clamping member 15 is used to clamp and limit the surface of the metal tube to stabilize the metal tube. After this preparation work is completed, in combination with the required bending angle of the metal tube, the rotation time of the motor is preset in advance. Then, the motor is started, and the output shaft of the motor begins to rotate. The power is transmitted to the right-angle coupling box 23 through the transmission structure 26. After being turned and transmitted by the right-angle coupling box 23, it drives the small gear to rotate. The small gear in turn drives the large gear meshing with it, and the large gear then drives the central shaft of the pressure roller table 21 to rotate, so that the pressure roller table 21 and the bending die 14 connected to its top rotate together. During the continuous rotation of the bending die 14, the metal tube is gradually bent in the inner groove of the bending die 14 until the preset angle is reached, and the bending operation is completed.

[0048] Among them, the clamping member 15 is composed of two semi-circular clamping blocks. One semi-circular clamping block is connected to the workbench 11 by bolts, and the other semi-circular clamping block is connected to the piston rod of the cylinder by a clamping method. After the metal tube is sleeved on the surface of the mandrel body 3, the cylinder is started, and the piston rod of the cylinder will drive the connected semi-circular clamping block to move towards the semi-circular clamping block fixed on the workbench 11 until the two fit together, so as to complete the firm fixation of the metal tube. It should be noted that based on the diverse requirements such as the pipe diameter and material of different metal tubes, these two semi-circular clamping blocks can be replaced to flexibly adapt to the fixing operations of various metal tubes.

[0049] The above-mentioned transmission structure 26 adopts a belt pulley structure to achieve the transmission of the rotation of the motor to the right-angle coupling box 23. When the motor operates, its output shaft drives the active belt pulley to rotate. Through the friction of the belt, the power is transmitted to the driven belt pulley connected to the right-angle coupling box 23, thereby enabling the right-angle coupling box 23 to operate. The function of the right-angle coupling box 23 is to change the power transmission direction and transmit the rotation to the gear set 22, and finally drive the pressure roller table 21 and the bending die 14 to complete the bending operation of the metal tube. The transmission structure 26 and the right-angle coupling box 23 both adopt existing technologies and will not be elaborated here.

[0050] In the metal tube bending device, the reason for using the transmission structure 26 and the right-angle coupling box 23 to transmit power instead of the motor directly is that the belt pulley in the transmission structure 26 can buffer the starting and overload impacts of the motor, protect the motor, and can flexibly adjust the speed by changing the diameter ratio to adapt to the bending requirements of different metal tubes. The right-angle coupling box 23 can change the power transmission direction, facilitate the flexible placement of the motor, optimize the equipment layout, and its internal gear transmission system can further adjust the torque to ensure that the pressure roller table 21 and the bending die 14 complete the bending operation stably and precisely.

[0051] When the metal pipe needs to be bent, the metal pipe needs to be sleeved on the surface of the mandrel body 3. In order to improve the bending effect, the mandrel body 3 needs to be stably installed. Therefore, the fixed end group 31 includes an installation component 30 fixedly installed on the surface of the moving slide plate 13. The end of the installation component 30 is fixedly connected with a fixed end rod 311. A rack is installed between the two tracks 12. The rack is fixedly installed on the surface of the workbench 11. A driving member is meshed and connected inside the rack, and the other end of the driving member is fixedly installed on the surface of the moving slide plate 13.

[0052] As Figure 5 shown, on the surface of one end of the moving slide plate 13 close to the bending die 14, the installation component 30 is fixedly installed. On the side of the installation component 30, the fixed end rod 311 of the mandrel body 3 is fixed. A driving hole is opened on the other surface of the moving slide plate 13. A folding plate is provided at the top of the driving hole. The other end of the folding plate is fixedly connected to the surface of the moving slide plate 13. A micro motor is installed on the surface of the folding plate. The output shaft of the motor passes through the driving hole and is connected to a small gear. The small gear meshes with the rack installed on the surface of the workbench 11. When the position of the mandrel body 3 needs to be adjusted, the micro motor is started. After the motor runs, its output shaft drives the small gear fixedly connected thereto to rotate. The small gear meshes and rolls on the surface of the rack, thereby driving the moving slide plate 13 to slide on the surfaces of the two tracks 12, and finally realizing the adjustment of the overall position of the mandrel body 3.

[0053] When the metal pipe is bent, the filling end group 32 plays a role in supporting the inside of the metal pipe. The filling end group 32 includes a first metal end 321, a bending end rod 322, and a second metal end 323. The first metal end 321, the bending end rod 322, and the second metal end 323 are fixedly connected in sequence.

[0054] A replacement connection end rod 324 is fixedly installed on one side of the first metal end 321 away from the bending end rod 322. An installation groove 312 is opened on the surface of the end of the fixed end rod 311 away from the installation component 30. The surface of the replacement connection end rod 324 fits against the inner wall of the installation groove 312.

[0055] The filling end group 32 is composed of a first metal end 321, a bending end rod 322, and a second metal end 323 fixedly connected in sequence. A replacement connection end rod 324 is provided on one side of the first metal end 321 away from the bending end rod 322. An installation groove 312 is opened on the surface of the end of the fixed end rod 311 away from the installation component 30. For the connection situation between the filling end group 32 and the fixed end group 31, as Figure 7 and Figure 8As shown in the figure, the spiral connection is shown in the figure. This connection method can provide a stable and reliable connection through the screwing of the threads, ensuring that during the bending process of the metal pipe, the filling end group 32 and the fixed end rod 311 will not loosen easily. In addition, the clamping connection method can also be adopted: Clamping connection utilizes the cooperation of the clamping groove and the clamping block. During installation, only need to align the clamping block on the replacement connection end rod 324 with the clamping groove in the installation groove 312 of the fixed end rod 311, and press or push forcefully to make the clamping block snap into the clamping groove to complete the connection.

[0056] Furthermore, when bending metal pipes with different inner diameters, different requirements for internal support are needed. In order to achieve a better bending effect, the bending end rod 322 with a suitable size can be selected for installation according to the inner diameter of the metal pipe. For example, for a metal pipe with a smaller inner diameter, select a bending end rod 322 with a smaller outer diameter to ensure that it can be smoothly inserted into the metal pipe to provide effective support; for a metal pipe with a larger inner diameter, select a bending end rod 322 with a larger outer diameter. In this way, during the bending process of metal pipes with various inner diameters, the filling end group 32 can play a good role in supporting the inside of the metal pipe, improving the quality and effect of bending.

[0057] The bending end rod 322 includes an elastic member 43, an elastic inner tube 42, and a leather outer tube 41 from the inside to the outside. The two ends of the elastic member 43, the elastic inner tube 42, and the leather outer tube 41 are respectively connected to the first metal end 321 and the second metal end 323. The elastic inner tube 42 and the leather outer tube 41 are arranged in a fitting manner, and the elastic inner tube 42 and the elastic member 43 are arranged in a non-fitting manner.

[0058] Regarding the internal structure of the bending end rod 322, combined with Figure 8 and Figure 9 it can be seen that from the inside to the outside are the elastic member 43, the elastic inner tube 42, and the leather outer tube 41 in sequence. The elastic member 43, as one of the core components (the elastic member 43 can be a spiral spring member with a relatively large number of turns), is located in the innermost layer. Its two ends are respectively connected to the first metal end 321 and the second metal end 323, playing a key elastic support and return role in the entire bending end rod 322. When the metal pipe is bent, the bending end rod 322 will bend along with the metal pipe. At this time, due to its good elasticity, the elastic member 43 can deform under the external force and adapt to the bending shape of the metal pipe. When the bending operation is completed and the external force is withdrawn, the elastic member 43 relies on its own elastic restoring force to assist the entire bending end rod 322 to return to the initial state;

[0059] The elastic inner tube 42 is close to the elastic member 43. Although they are not in a fitting arrangement, the elastic inner tube 42 can provide certain auxiliary support when the elastic member 43 deforms. Its two ends are also connected to the first metal end 321 and the second metal end 323. During the bending process, the elastic inner tube 42 will also bend together with the metal tube and the elastic member 43 to maintain the stability of the overall structure;

[0060] The leather outer tube 41 is located in the outermost layer and is arranged in contact with the elastic inner tube 42. It can not only protect the internal elastic inner tube 42 and elastic member 43 from external damage, but also play a certain role in buffering and reducing friction when the bending end rod 322 contacts the inner wall of the metal tube. During the bending process of the metal tube, the leather outer tube 41 will bend together with the internal structure to ensure the normal operation of the bending end rod 322 inside the metal tube, and it can also cooperate with the overall structure to smoothly return to its original state when the elastic member 43 assists in returning to the original position.

[0061] When bending the short metal tube, it is difficult to obtain a stable support at the bending end of the metal tube, which will cause uneven stress distribution to a certain extent. Therefore, the extension end group 33 includes a sleeve rod 331. The sleeve rod 331 can be sleeved on the end of the metal tube to be bent. An inner rod 332 is arranged in the middle of the sleeve rod 331, and the sleeve rod 331 and the inner rod 332 are connected by threads.

[0062] On the surface of the second metal end 323 away from the bending end rod 322, a plug-in limit groove 333 is opened, and the inner wall of the plug-in limit groove 333 fits with the end of the inner rod 332.

[0063] An inner pad 5 is fixedly installed on the inner wall of the sleeve rod 331, and the inner pad 5 is made of an elastic material.

[0064] First, as Figure 2 and in combination with Figure 5 shown, when the metal tube is sleeved on the surface of the mandrel body 3, during the process of inserting the second metal end 323 into the metal tube, it can initially friction and polish the inner wall of the metal tube. Based on the fact that the material of the second metal end 323 is harder than the impurities on the inner wall of the metal tube, relative friction is generated between the two during the insertion process, thereby removing the impurities attached to the inner wall of the metal tube. The purpose is to reduce the scratches on the surface of the bending end rod 322 caused by these impurities as the metal tube deforms during subsequent bending operations, and further reduce the scratching of the surface of the bending end rod 322, ensuring the integrity of the bending end rod 322 and enabling it to continuously and effectively play a supporting role for the inside of the metal tube;

[0065] After the metal pipes are sleeved, the bent end of the metal pipe will be flush with the second metal end 323. Moreover, the bent end rod 322 has a structure consisting of an elastic member 43, an elastic inner tube 42, and a leather outer tube 41 from the inside to the outside. The elastic member 43, as the core elastic element, can undergo elastic deformation under external forces when the metal pipe is bent to adapt to the bending curvature of the metal pipe. The elastic inner tube 42 provides auxiliary support for the elastic member 43 to enhance the stability of the overall structure. The leather outer tube 41 protects the internal structure from external damage and plays a role in buffering and reducing friction when contacting the inner wall of the metal pipe. This elastic structure enables the bent end rod 322 to better fill the internal space of the metal pipe. During the bending process, it provides all-round and stable internal support for the metal pipe, ensuring that when the metal pipe is bent under force, all parts inside can receive uniform support force, and reducing deformation defects caused by uneven internal support.

[0066] Furthermore, as shown in Figure 10 and Figure 11 , after the metal pipes are sleeved, the sleeve rod 331 is sleeved on the bent end of the metal pipe. The elastic inner pad 5 fixed to the inner wall of the sleeve rod 331, due to its elastic material properties (such as using rubber material), can closely fit the surface of the metal pipe. This fitting process utilizes the deformability of the elastic material. When the inner pad 5 contacts the metal pipe, it will automatically adjust its shape according to the shape of the metal pipe, thus achieving close contact. And because its material is soft, it will not cause scratches or damage to the surface of the metal pipe. At the same time, the inner rod 332 is inserted into the insertion limit groove 333 of the second metal end 323. Through this connection method, the sleeve rod 331 and the inner rod 332 jointly achieve double fixation of the metal pipe. On the one hand, the sleeve rod 331 restricts the radial movement of the metal pipe through the friction force between the inner pad 5 and the outer wall of the metal pipe. On the other hand, the cooperation between the inner rod 332 and the insertion limit groove 333 restricts the axial movement of the metal pipe. This double fixation method enables the extension end group 33 to have a stable extension effect on the metal pipe. When the metal pipe is bent, it can balance the stress distribution, avoid bending quality problems caused by unstable end fixation or stress concentration, and at the same time protect the end of the metal pipe from being over-extruded or damaged during the bending process.

[0067] Subsequently, the power mechanism 2 is used to drive the bending die 14 to perform a bending operation on the metal pipe. After the bending is completed, first, the sleeve rod 331 is pulled out from the metal pipe, as shown in Figure 4As shown, since the connection between the sleeve rod 331 and the metal tube is achieved through the frictional force of the inner pad 5, when an external force greater than the frictional force is applied, this connection state can be destroyed, causing the sleeve rod 331 to separate from the metal tube. At the same time, the inner rod 332 also disengages from the insertion limiting groove 333. When disassembling the metal tube, the moving slide plate 13 is started. The moving slide plate 13 drives the fixed end group 31 and the filling end group 32 to slide to the other side of the workbench 11. Since the leather outer tube 41 cannot be stretched, when the moving slide plate 13 displaces, it will drive the entire filling end group 32 to move synchronously through the fixed end group 31. During the movement, the second metal end 323 will rub against the inner wall of the bent metal tube again. This frictional force prompts the second metal end 323 to clean the inner wall of the metal tube for the second time. Moreover, since the second metal end 323 is relatively short, within the bent metal tube, its moving space is relatively sufficient and it will not be hindered by the bent shape of the metal tube, and can smoothly slide out of the metal tube along with the filling end group 32 to complete the entire disassembly process. Using this disassembly method can further protect the metal tube.

[0068] It should be noted that: the structural design of the bent end rod 322 enables it to stably support the second metal end 323. The second metal end 323 is relatively short and is provided with an insertion limiting groove 333, and its overall weight is relatively light. The elastic member 43, the elastic inner tube 42 and the leather outer tube 41 inside the bent end rod 322 together constitute a structure with good support performance. When the second metal end 323 is installed at one end of the bent end rod 322, the bent end rod 322 can withstand the weight of the second metal end 323 by virtue of its own elastic structure. And during the bending process of the metal tube, even when subjected to an external force, the bent end rod 322 can maintain stable support for the second metal end 323 through its own elastic deformation. Since the second metal end 323 is light in weight, the bent end rod 322 will not be overly bent due to its own gravity, thus ensuring the stability of the entire filling end group 32 inside the metal tube and providing a reliable internal support guarantee for the bending operation of the metal tube.

[0069] During the bending process of the metal tube, the bent end rod 322 needs to slide and bend inside the metal tube. During this process, the leather outer tube 41 will rub against the inner wall of the metal tube. To reduce the damage to the bent end rod 322 caused by this friction, an outer coating film 44 is laid on the surface of the leather outer tube 41 away from the elastic inner tube 42, and the surface of the outer coating film 44 is made of a smooth material.

[0070] The improvement lies in: combining Figure 9, so an outer covering film 44 is laid on the surface of the cortical outer tube 41 on the side away from the elastic inner tube 42, and the surface of the outer covering film 44 is made of a smooth material. Among them, the outer covering film 44 can be made of polytetrafluoroethylene material, which has an extremely low coefficient of friction, a smooth surface, can effectively reduce the friction with the inner wall of the metal tube, and at the same time has good chemical stability and corrosion resistance, and can adapt to various metal tube materials and different working environments.

[0071] Working principle:

[0072] First, the metal tube to be polished is sleeved on the surface of the filling end group 32. During this process, when the second metal end 323 is inserted into the metal tube, it can initially friction and polish the inner wall of the metal tube. After the metal tube is sleeved, the bent end of the metal tube will be flush with the second metal end 323. And the bent end rod 322 is composed of an elastic member 43, an elastic inner tube 42 and a cortical outer tube 41 from inside to outside. After the metal tube is sleeved, the sleeve rod 331 is sleeved on the bent end of the metal tube. The elastic inner pad 5 fixed on the inner wall of the sleeve rod 331 can closely fit the surface of the metal tube. This fitting process utilizes the deformability of the elastic material. When the inner pad 5 contacts the metal tube, it will automatically adjust its shape according to the shape of the metal tube, so as to achieve close contact.

[0073] Subsequently, the bending die 14 is driven by the power mechanism 2 to perform a bending operation on the metal tube. During the bending process, as the metal tube deforms, the bent end rod 322 will bend inside the metal tube, realizing relatively comprehensive support for the inside of the metal tube.

[0074] After bending is completed, first pull out the sleeve rod 331 from the metal tube. When disassembling the metal tube, start the moving slide plate 13. The moving slide plate 13 drives the fixed end group 31 and the filling end group 32 to slide to the other side of the workbench 11. Since the cortical outer tube 41 cannot be stretched, when the moving slide plate 13 generates a displacement, it will drive the entire filling end group 32 to move synchronously through the fixed end group 31. During the movement, the second metal end 323 will rub against the inner wall of the bent metal tube again. And because the second metal end 323 is shorter, in the bent metal tube, its moving space is relatively sufficient and will not be hindered by the bent shape of the metal tube, and can smoothly slide out of the metal tube with the filling end group 32 to complete the entire disassembly process. Therefore, during the entire metal tube bending process, the effects of supporting the inside of the metal tube and balancing the bending stress of the metal tube can be achieved simultaneously.

[0075] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A metal pipe bending device for construction machinery, comprising a bending device body (1), characterized in that: The bending equipment body (1) includes a workbench (11), and two tracks (12) are installed on the surface of the workbench (11). A moving slide plate (13) is slidably arranged on the surfaces of the two tracks (12); A power mechanism (2) is installed on one side of the workbench (11). A mandrel body (3) is installed on the surface of the moving slide plate (13), and the mandrel body (3) extends towards the power mechanism (2); A clamping member (15) is installed between the moving slide plate (13) and the power mechanism (2), and the clamping member (15) is located on the surface of the workbench (11); The power mechanism (2) includes a wheel table mounting plate (25) and a pressure receiving roller table (21). A bending die (14) is installed on the top of the wheel table mounting plate (25). The pressure receiving roller table (21) rotates following the bending die (14) to cooperate with the bending die (14) to perform a bending operation on a metal tube; The mandrel body (3) includes a fixed end group (31), a filling end group (32), and an extension end group (33). The fixed end group (31), the filling end group (32), and the extension end group (33) are connected in sequence; During the bending assembly of the metal tube, the filling end group (32) is completely filled inside the metal tube, and when the metal tube is bent, it bends together with the metal tube. During the bending process, the extension end group (33) fits with the filling end group (32) to realize the extension of the metal tube and limit the filling end group (32); The wheel table mounting plate (25) is fixedly installed on the side wall of the workbench (11). A bearing seat is installed on the surface of the wheel table mounting plate (25). The central axis of the pressure receiving roller table (21) is located inside the bearing seat, and the bending die (14) is fixedly connected to the top of the central axis of the pressure receiving roller table (21); A gear set (22) is fixedly installed at the bottom of the central axis of the pressure receiving roller table (21). The gear set (22) includes a large gear and a small gear that are meshed and connected. The large gear is connected to the pressure receiving roller table (21), and the small gear is rotatably arranged at the bottom of the workbench (11). Moreover, the other end of the small gear is connected to one of the drive shafts of a right-angle coupling box (23); A vertical plate (24) is fixedly installed at the bottom of the workbench (11). The right-angle coupling box (23) is fixedly installed on the surface of the vertical plate (24). The other end of the right-angle coupling box (23) is connected to a transmission structure (26), and the other end of the transmission structure (26) is fixedly connected to the output shaft of a motor. The motor is fixedly installed at the bottom of the workbench (11); The filling end group (32) includes a first metal end (321), a bending end rod (322), and a second metal end (323). The first metal end (321), the bending end rod (322), and the second metal end (323) are fixedly connected in sequence; The bent end rod (322) includes an elastic member (43), an elastic inner tube (42), and a leather outer tube (41) from the inside to the outside. The two ends of the elastic member (43), the elastic inner tube (42), and the leather outer tube (41) are respectively connected to the first metal end (321) and the second metal end (323). The elastic inner tube (42) and the leather outer tube (41) are arranged in a fitting manner, and the elastic inner tube (42) and the elastic member (43) are arranged in a non-fitting manner.

2. The metal pipe bending device for construction machinery according to claim 1, characterized in that: The fixed end group (31) includes a mounting member (30) fixedly installed on the surface of the moving slide plate (13). A fixed end rod (311) is fixedly connected to the end of the mounting member (30). A rack is installed between the two tracks (12). The rack is fixedly installed on the surface of the workbench (11). A driving member is meshed inside the rack, and the other end of the driving member is fixedly installed on the surface of the moving slide plate (13).

3. The metal pipe bending device for construction machinery according to claim 2, characterized in that: A replacement connection end rod (324) is fixedly installed on the side of the first metal end (321) away from the bent end rod (322). An installation groove (312) is formed on the surface of the end of the fixed end rod (311) away from the mounting member (30). The surface of the replacement connection end rod (324) is in contact with the inner wall of the installation groove (312).

4. The metal pipe bending device for construction machinery according to claim 1, wherein: The extension end group (33) includes a sleeve rod (331). The sleeve rod (331) can be sleeved on the end of the metal tube to be bent. An inner rod (332) is arranged in the middle of the sleeve rod (331). The sleeve rod (331) and the inner rod (332) are connected by threads.

5. The metal pipe bending device for construction machinery according to claim 1, characterized in that: A plug-in limit groove (333) is formed on the surface of the side of the second metal end (323) away from the bent end rod (322). The inner wall of the plug-in limit groove (333) is in contact with the end of the inner rod (332).

6. The metal pipe bending device for construction machinery according to claim 4, characterized in that: An inner pad (5) is fixedly installed on the inner wall of the sleeve rod (331). The inner pad (5) is made of an elastic material.

7. The metal pipe bending device for construction machinery according to claim 1, wherein: An outer coating film (44) is laid on the surface of the side of the leather outer tube (41) away from the elastic inner tube (42). The surface of the outer coating film (44) is made of a smooth material.

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