Bending mechanism and pipe bending machine

Abstract

The invention relates to a bending mechanism and a pipe bender, and the bending mechanism comprises a supporting mold assembly which comprises a supporting mold, the supporting mold is provided with a supporting groove used for supporting a copper pipe, the end part of the supporting groove forms an arc-shaped turning section, and the arc-shaped turning section is used for bending the copper pipe; the die bending assembly comprises a rotating frame, an explorator arranged on the rotating frame and a core rod arranged on the rotating frame, the core rod is arranged in the supporting groove in a penetrating mode and used for sleeving the copper pipe, and the explorator can move in the direction close to the supporting die relative to the rotating frame so that the copper pipe can be clamped to the supporting die; the rotating frame can drive the explorator and the core rod to rotate relative to the supporting mold so that the copper pipe can be bent along the arc-shaped turning section, and the core rod can move relative to the rotating frame so that the core rod can retreat from the copper pipe on the supporting groove. According to the bending mechanism, the probability of bevel connection of produced elbows can be reduced, rebound deformation of the elbows is reduced, the production quality of the elbows is improved, and the product percent of pass is increased.

Description

Technical Field

[0001] The present application relates to the technical field of pipe bending equipment, and in particular to a bending mechanism and a pipe bending machine. Background Art

[0002] In air-conditioning systems, elbows are important components of piping systems, condensers, evaporators, etc. Their processing accuracy and quality need to meet high requirements.

[0003] In the related art, the elbows produced by the U-tube bending sleeve integrated machine will have a large bevel and produce a large rebound deformation, which reduces the production quality and product qualification rate of the elbows. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a bending mechanism and a pipe bending machine, which can reduce the probability of beveled elbows, reduce the rebound deformation of elbows, and improve the production quality and product qualification rate of elbows.

[0005] In a first aspect, the present application provides a bending mechanism, comprising:

[0006] A support mold assembly comprises a support mold, wherein the support mold is provided with a support groove for supporting the copper tube, and the end of the support groove forms an arc-shaped turning section, and the arc-shaped turning section is used for bending the copper tube;

[0007] The bending die assembly comprises a rotating frame, a support die arranged on the rotating frame, and a core rod arranged on the rotating frame, wherein the core rod is inserted into the bracket and used for sleeve-arranging the copper tube, and the support die can move relative to the rotating frame toward the support die to clamp the copper tube on the support die;

[0008] The rotating frame can drive the supporting mold and the core rod to rotate relative to the supporting mold, so that the copper tube is bent along the arc-shaped turning section, and the core rod can move relative to the rotating frame to withdraw from the copper tube on the bracket.

[0009] The bending mechanism according to the first aspect of the present application has at least the following beneficial effects:

[0010] The bending mechanism of the present application is arranged by the cooperation of the support die assembly and the bending die assembly. In the copper tube feeding stage, the core rod on the bending die assembly provides positioning guidance for the copper tube, so that the copper tube can be accurately fed to the bracket on the support die. The bracket cooperates with the backing die on the bending die assembly to clamp the copper tube, so that the position of the copper tube on the bracket remains stable, so that the copper tube can be accurately fed. In the copper tube bending stage, the copper tube is bent along the arc turning section under the constraints of the backing die and the core rod, so as to ensure the bending roundness quality of the copper tube. In the copper tube unloading stage, the core rod can form a limit constraint on the rebound of the copper tube before withdrawing from the copper tube, effectively reducing the rebound deformation of the copper tube after bending, and ensuring the bending quality of the copper tube. At the same time, the core rod and the backing die can successively break away from the limit constraint on the copper tube after the copper tube is bent, avoiding structural interference in the unloading of the copper tube after bending, and ensuring the accurate unloading of the copper tube after bending. In this way, the probability of the elbow obtained by cutting the bent pipe section on the copper pipe having a beveled mouth and uneven bottom ends is reduced, the rebound deformation of the elbow is effectively reduced, and the production quality of the elbow and the product qualification rate are improved.

[0011] In some embodiments, the bending mold assembly also includes a sliding frame and a first driving member, the supporting mold is arranged on the sliding frame, and the sliding frame is slidably installed on the rotating frame. The first driving member is arranged on the rotating frame and connected to the sliding frame to drive the sliding frame to drive the supporting mold to move in a direction close to or away from the supporting mold.

[0012] In some embodiments, the bending mold assembly also includes a second driving member, which is arranged on the sliding frame and the driving end of the second driving member is connected to the core rod to drive the core rod to move along the straight line where the bracket is located, and the driving direction of the second driving member is perpendicular to the driving direction of the first driving member.

[0013] In some embodiments, the bending mold assembly also includes a connecting frame and a first guide rod, the core rod is arranged on the connecting frame and is located at the bottom of the supporting mold, the first guide rod is arranged on the sliding frame and passes through the connecting frame, the first guide rod is also parallel to the core rod and distributed at intervals, and the driving end of the second driving member is connected to the connecting frame.

[0014] In some embodiments, the bending mechanism further includes an elastic buffer structure, which is disposed between the sliding frame and the rotating frame and is used to provide elastic buffering to the backing mold when the backing mold clamps the copper tube to the supporting mold.

[0015] In some embodiments, the elastic buffer structure includes a first stop block, a second stop block, a compression elastic member and a second guide rod, the first stop block and the second stop block are respectively arranged on the rotating frame and the sliding frame, the second guide rod is arranged on the second stop block and passes through the first stop block, and the compression elastic member is clamped between the first stop block and the second stop block and is sleeved on the second guide rod.

[0016] In some embodiments, the bending mechanism also includes a first frame, and the rotating frame is rotatably disposed on the first frame. The first frame is provided with a first limit block and a second limit block on opposite sides thereof, respectively. The first limit block and the second limit block are located on the rotating path of the rotating frame to cooperate in limiting the rotating position of the rotating frame.

[0017] In some embodiments, a third driving member and a proximity switch are provided on the first frame, a driving end of the third driving member is connected to the rotating frame to drive the rotating frame to rotate relative to the first frame, and the proximity switch is used to detect whether the rotating frame is rotated to a preset position, and the proximity switch is electrically connected to the third driving member.

[0018] In some embodiments, the support mold is provided with a plurality of parallel and spaced apart support grooves, and the rotating frame is correspondingly provided with a plurality of support molds and a plurality of core rods.

[0019] In a second aspect, an embodiment of the present application provides a pipe bending machine, which includes the bending mechanism described above.

[0020] The pipe bending machine according to the second aspect of the present application has at least the following beneficial effects:

[0021] The pipe bending machine of the present application, because it is equipped with the above-mentioned bending mechanism, also has the same effect brought by the above-mentioned bending mechanism, that is, through the cooperation of the support die assembly and the bending die assembly, in the copper tube feeding stage, the core rod on the bending die assembly provides positioning guidance for the copper tube, so that the copper tube is accurately fed to the bracket on the support die. The bracket cooperates with the backing die on the bending die assembly to clamp the copper tube, so that the position of the copper tube on the bracket remains stable, so that the copper tube is accurately fed. In the copper tube bending stage, the copper tube is bent along the arc turning section under the constraints of the backing die and the core rod, so as to ensure the bending roundness quality of the copper tube. In the copper tube unloading stage, the core rod can form a limit constraint on the rebound of the copper tube before withdrawing from the copper tube, effectively reducing the rebound deformation of the copper tube after bending, and ensuring the bending quality of the copper tube. At the same time, the core rod and the backing die can successively break away from the limit constraint on the copper tube after bending, avoiding structural interference in the unloading of the copper tube after bending, and ensuring the accurate unloading of the copper tube after bending. In this way, the probability of the elbow obtained by cutting the bent pipe section on the copper pipe having a beveled mouth and uneven bottom ends is reduced, the rebound deformation of the elbow is effectively reduced, and the production quality of the elbow and the product qualification rate are improved.

[0022] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0024] Figure 1 It is a schematic structural diagram of the bending mechanism of an embodiment of the present application.

[0025] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0026] Figure 3 Another structural schematic diagram of the bending mechanism of an embodiment of the present application.

[0027] Figure 4 for Figure 3 A partial enlarged view of point B in the middle.

[0028] Figure 5 for Figure 3 A partial enlarged view of point C in the middle.

[0029] Figure 6 It is a top view of the structure of the bending mechanism of an embodiment of the present application.

[0030] Figure 7 It is a partial structural schematic diagram of the bending mechanism of an embodiment of the present application.

[0031] Figure 8 This is another partial structural schematic diagram of the bending mechanism of an embodiment of the present application.

[0032] Explanation of the reference numerals: first frame 100; first limit block 110; second limit block 120; third driving member 130; proximity switch 140; first in-position switch 141; second in-position switch 142; rotating shaft 150; first bearing seat 160; second bearing seat 170; support mold assembly 200; support mold 210; copper tube 500; bracket 211; arc-shaped turning section 212; bending mold assembly 300; rotating frame 310; slide rail 311; support mold 320; core rod 330; sliding frame 340; slider 341; first driving member 350; second driving member 360; connecting frame 370; first guide rod 380; elastic buffer structure 400; first stop block 410; second stop block 420; compression elastic member 430; second guide rod 440. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0035] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0039] In air-conditioning systems, elbows are important components of piping systems, condensers, evaporators, etc. Their processing accuracy and quality need to meet high requirements.

[0040] In the related art, a U-tube bending and sleeve integrated machine is generally used to produce elbows. However, due to the limitations of its own structure, the elbows produced by this U-tube bending and sleeve integrated machine will have a large bevel, that is, the two feet at the bottom of the elbow are not flush, and the elbow will have a large rebound deformation after the copper tube is bent into an elbow, which reduces the production quality and product qualification rate of the elbow.

[0041] Based on this, one or more embodiments of the present application provide a bending mechanism, which is arranged by the cooperation of the support die assembly 200 and the bending die assembly 300. In the copper tube feeding stage, the core rod 330 on the bending die assembly 300 provides a positioning guide for the copper tube 500, so that the copper tube 500 is accurately fed to the bracket 211 on the support die 210. The bracket 211 cooperates with the support die 320 on the bending die assembly 300 to clamp the copper tube 500, so that the position of the copper tube 500 on the bracket 211 remains stable, so that the copper tube 500 is accurately fed. In the copper tube bending stage, the copper tube 500 is bent along the arc-shaped turning section 212 under the constraints of the support die 320 and the core rod 330, so as to ensure the bending roundness quality of the copper tube 500. During the copper tube blanking stage, the core rod 330 can limit the rebound of the copper tube 500 before withdrawing from the copper tube 500, effectively reducing the rebound deformation of the copper tube 500 after bending, and ensuring the bending quality of the copper tube 500. At the same time, the core rod 330 and the mold 320 can successively break away from the limit constraints on the copper tube 500 after the copper tube 500 is bent, avoiding structural interference in the blanking of the bent copper tube 500, and ensuring accurate blanking of the bent copper tube. In this way, the probability of the elbow obtained by cutting the bent tube section on the copper tube 500 having a beveled mouth and uneven bottom ends is reduced, the rebound deformation of the elbow is effectively reduced, and the production quality of the elbow and the product qualification rate are improved.

[0042] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 An embodiment of the present application provides a bending mechanism, which includes a support die assembly 200 and a bending die assembly 300.

[0043] The support mold assembly 200 includes a support mold 210 . A support groove 211 for supporting the copper tube 500 is formed on the support mold 210 . An arc-shaped turning section 212 is formed at the end of the support groove 211 . The arc-shaped turning section 212 is used for bending the copper tube 500 .

[0044] The bending die assembly 300 includes a rotating frame 310, a supporting die 320 disposed on the rotating frame 310, and a core rod 330 disposed on the rotating frame 310. The core rod 330 is passed through the bracket 211 for sleeve installation of the copper tube 500. The supporting die 320 can move relative to the rotating frame 310 toward the supporting die 210 to clamp the copper tube 500 on the supporting die 210.

[0045] The rotating frame 310 can drive the supporting mold 320 and the core rod 330 to rotate relative to the supporting mold 210 so that the copper tube 500 is bent along the arc-shaped turning section 212 , and the core rod 330 can move relative to the rotating frame 310 to withdraw from the copper tube 500 on the bracket 211 .

[0046] It should be noted that see Figure 2 and Figure 4In the support mold assembly 200 of the present application, the inner wall of the bracket 211 provided on the support mold 210 is in an arc shape, such as a cross section of the bracket 211 is a semicircular arc, so as to match the copper tube 500 in a circular tube shape, so as to stably support the copper tube 500. The bracket 211 includes a straight section and an arc-shaped turning section 212 connected to the end of the straight section, and the central angle corresponding to the arc length of the arc-shaped turning section 212 is substantially equal to the central angle corresponding to the arc length of the elbow to be formed.

[0047] When the copper tube 500 is loaded onto the support die 210, the core rod 330 on the bending die assembly 300 is pre-installed in the bracket 211 and forms a gap with the inner wall of the bracket 211 for positioning and sleeve installation of the copper tube 500. Then, the copper tube 500 can be fed to the support die 210 through a feeding mechanism (not shown in the figure), so that the copper tube 500 is positioned and sleeved on the core rod 330 and stably supported on the bracket 211, so that the copper tube 500 is accurately loaded on the bracket 211 of the support die 210. The feeding mechanism can be a feeding cylinder, which directly pushes the copper tube 500 along the track of the bracket 211 and sleeves it on the core rod 330.

[0048] It is easy to understand that after the copper tube 500 is stably supported on the bracket 211 of the support mold 210, one end of the copper tube 500 close to the arc-shaped turning section 212 extends out of the bracket 211, and the part of the copper tube 500 extending out of the bracket 211 is the copper tube section to be bent along the arc-shaped turning section 212.

[0049] See also Figure 1 , Figure 2 and Figure 3 In the present application, the bending mechanism also includes a first frame 100 and a third driving member 130 arranged on the first frame 100. Both ends of the rotating frame 310 are installed on the first frame 100 through bearings. The driving end of the third driving member 130 is connected to the rotating frame 310 to drive the rotating frame 310 to rotate relative to the first frame 100. The third driving member 130 can be an electric motor, a motor, etc., or it can be a rotating drive structure in which an electric motor or a motor cooperates with a reducer.

[0050] In the bending mold assembly 300 of the present application, the support mold 320 can be set at the bottom end of the rotating frame 310, and the core rod 330 is set at the bottom end of the support mold 320. The support mold 320 is perpendicular to the axial direction of the core rod 330 in the direction close to the support mold 210 relative to the rotating frame 310.

[0051] It is understandable that when the rotating frame 310 rotates, the supporting mold 320 and the core rod 330 disposed on the rotating frame 310 rotate synchronously with the rotating frame 310 .

[0052] See also Figure 1 , Figure 2 , Figure 3 and Figure 4The bending mechanism of the present application performs the following actions to bend the copper tube 500:

[0053] Copper tube loading stage: The core rod 330 is inserted into the bracket 211 and the end of the core rod 330 extends out of the arc-shaped turning section 212 of the bracket 211. At this time, the core rod 330 provides positioning for the copper tube 500 in advance. Then, the copper tube 500 is pushed to the bracket 211 and sleeved on the core rod 330 under the guidance and positioning of the core rod 330 and the power of the corresponding loading mechanism. Then, the backing mold 320 moves relative to the rotating frame 310 toward the direction close to the support mold 210 to dock with the bracket 211 of the support mold 210 to form a clamping cavity that wraps and clamps the copper tube 500, thereby clamping the copper tube 500 to the support mold 210 to ensure the stability of the position of the copper tube 500. At this time, the copper tube 500 is positioned and loaded.

[0054] Copper tube bending stage: The rotating frame 310 drives the support mold 320 and the core rod 330 disposed thereon to rotate relative to the support mold 210, and the section of the copper tube 500 extending from the arc-shaped turning section 212 at the end of the bracket 211 is bent along the arc-shaped turning section 212 under the constraint of the support mold 320 and the core rod 330. When the rotating frame 310 drives the support mold 320 and the core rod 330 thereon to rotate to a preset position, the section of the copper tube 500 extending from the arc-shaped turning section 212 at the end of the bracket 211 is attached to the arc-shaped turning section 212 and overlaps with the arc-shaped turning section 212. At this time, the copper tube 500 is bent.

[0055] Copper tube blanking stage: after the copper tube 500 is bent, since the core rod 330 is still in the bent section of the copper tube 500, when the bent section of the copper tube 500 rebounds and deforms, the bent section of the copper tube 500 will be difficult to rebound under the limit constraint of the core rod 330, that is, the core rod 330 that has not yet withdrawn from the copper tube 500 can continue to limit and constrain the bent section of the copper tube 500, so as to reduce the rebound deformation of the copper tube 500 after bending, and reduce the probability of the elbow obtained by cutting the bent section on the copper tube 500 having a bevel and uneven bottom ends.

[0056] Then, the core rod 330 first moves relative to the rotating frame 310 to withdraw from the bent copper tube 500, and releases the constraint on the copper tube 500 in advance to avoid structural interference in the blanking of the bent copper tube 500. After the core rod 330 moves and withdraws, the backing mold 320 moves relative to the rotating frame 310 toward the direction of the away support mold 210 to reset to the initial position relative to the rotating frame 310 to disengage from the clamping of the copper tube 500. At this time, the bent copper tube 500 is in a state of abutting against the bracket 211. The corresponding blanking mechanism (not shown in the figure) can send the copper tube 500 to the cutting station (not shown in the figure) to cut off the bent tube section on the copper tube 500 to obtain an elbow. The blanking mechanism can be a blanking cylinder, which directly pushes the bent copper tube 500 to the cutting station.

[0057] After the bent copper tube 500 is unloaded from the bracket 211 on the support die 210, the rotating frame 310 drives the support die 320 and the core rod 330 thereon to rotate, and at the same time, the core rod 330 moves relative to the rotating frame 310 to reset to the initial position on the rotating frame 310 so as to position and load the next copper tube 500. In this way, the bending die assembly 300 is reset to the initial position as a whole, waiting for the next bending operation.

[0058] Based on the above description, it is not difficult to understand that the bending mechanism of the embodiment of the present application is arranged by the cooperation of the support mold assembly 200 and the bending mold assembly 300. In the copper tube feeding stage, the core rod 330 provides positioning guidance for the copper tube 500, so that the copper tube 500 is accurately fed to the bracket 211 on the support mold 210. The support mold 320 and the bracket 211 cooperate to clamp the copper tube 500, so that the position of the copper tube 500 on the bracket 211 remains stable, so that the copper tube 500 is accurately fed. In the copper tube bending stage, the copper tube 500 is bent along the arc turning section 212 under the constraints of the support mold 320 and the core rod 330, ensuring the bending roundness quality of the copper tube 500. In the copper tube unloading stage, the core rod 330 can form a limit constraint on the rebound of the copper tube 500 before withdrawing from the copper tube 500, effectively reducing the rebound deformation of the copper tube 500 after bending, and ensuring the bending quality of the copper tube 500. At the same time, the core rod 330 and the support mold 320 can successively break away from the limiting constraints on the copper tube 500 after the copper tube 500 is bent, avoiding structural interference in the blanking of the bent copper tube 500, and ensuring accurate blanking of the bent copper tube. In this way, the probability of the elbow obtained by cutting the bent tube section on the copper tube 500 having a beveled mouth and uneven bottom ends is reduced, the rebound deformation of the elbow is effectively reduced, and the production quality and product qualification rate of the elbow are improved.

[0059] See also Figure 1 , Figure 3 and Figure 4 In some embodiments of the present application, the bending mold assembly 300 also includes a sliding frame 340 and a first driving member 350. The support mold 320 is arranged on the sliding frame 340, and the sliding frame 340 is slidably installed on the rotating frame 310. The first driving member 350 is arranged on the rotating frame 310 and connected to the sliding frame 340 to drive the sliding frame 340 to drive the support mold 320 to move in a direction close to or away from the support mold 210.

[0060] Specifically, a slide rail 311 is vertically mounted on the rotating frame 310, and a slider 341 is provided on the sliding frame 340 to slide with the slide rail 311. The sliding frame 340 is slidably mounted on the slide rail 311 through the slider 341, so that the sliding frame 340 can slide vertically relative to the rotating frame 310. The support mold 320 is fixed at the bottom end of the sliding frame 340.

[0061] The first driving member 350 can be a linear driving structure such as a cylinder, a hydraulic cylinder, an electric push rod, etc. It is not difficult to understand that the first driving member 350 drives the slide frame 340 to slide vertically along the rotating frame 310, so as to drive the support mold 320 to move in a direction close to or away from the support mold 210, so that the support mold 320 cooperates with the support mold 210 to clamp the copper tube 500 on the support mold 210 or to disengage from the clamping of the copper tube 500, thereby ensuring the smoothness and accuracy of the loading, bending and unloading of the copper tube 500.

[0062] Further, see Figure 1 , Figure 3 and Figure 4 The bending mold assembly 300 also includes a second driving member 360, which is disposed on the sliding frame 340 and the driving end of the second driving member 360 is connected to the core rod 330 to drive the core rod 330 to move along the straight line where the bracket 211 is located, and the driving direction of the second driving member 360 is perpendicular to the driving direction of the first driving member 350.

[0063] Specifically, the second driving member 360 is fixedly mounted on the sliding frame 340, and the core rod 330 is located between the backing mold 320 and the support mold 210 in the horizontal direction. The second driving member 360 can also be a linear driving structure such as a cylinder, a hydraulic cylinder, an electric push rod, etc. It can be understood that the direction in which the second driving member 360 drives the core rod 330 to move relative to the rotating frame 310 or the sliding frame 340 is a horizontal direction, which is perpendicular to the moving direction of the backing mold 320 relative to the rotating frame 310.

[0064] It should be noted that, since the outer diameter of the core rod 330 is smaller than the inner diameter of the copper tube 500, when the copper tube 500 is loaded into the bracket 211 and sleeved on the core rod 330, no contact is formed between the core rod 330 and the copper tube 500. When the first driving member 350 drives the sliding frame 340 to drive the support mold 320 to move in the direction close to the support mold 210, the sliding frame 340 drives the second driving member 360 thereon and the core rod 330 connected to the second driving member 360 to move synchronously, so that as the support mold 320 moves down a certain distance, the core rod 330 also moves down a certain distance. When the support mold 320 abuts against the outer wall of the copper tube 500 on the support mold 210, the core rod 330 just moves down to the state where the outer wall of the core rod 330 forms contact with the inner wall of the copper tube 500.

[0065] In this way, during the bending process of the copper tube 500, the core rod 330 can more effectively and accurately provide constraints and guidance for the bending of the copper tube 500, so that the copper tube 500 can be accurately bent along the trajectory of the arc-shaped turning section 212, ensuring the bending roundness quality of the bent tube section on the copper tube 500, thereby improving the production quality and product qualification rate of the elbows obtained by subsequently cutting the bent tube section on the copper tube 500.

[0066] Similarly, in the copper tube unloading stage, after the core rod 330 is driven by the second driving member 360 to withdraw horizontally from the bent copper tube 500, the first driving member 350 drives the sliding frame 340 to drive the support mold 320 to move in a direction away from the support mold 210. In the process, the sliding frame 340 drives the second driving member 360 thereon and the core rod 330 connected to the second driving member 360 to move synchronously in a direction away from the support mold 210, so that the support mold 320 and the core rod 330 can be moved away from the support mold 210 together, avoiding structural interference in the unloading of the bent copper tube 500, thereby ensuring accurate unloading of the bent copper tube.

[0067] Further, see Figure 1 , Figure 3 , Figure 4 and Figure 6 The bending mold assembly 300 also includes a connecting frame 370 and a first guide rod 380. The core rod 330 is arranged on the connecting frame 370 and is located at the bottom of the supporting mold 320. The first guide rod 380 is arranged on the sliding frame 340 and penetrates the connecting frame 370. The first guide rod 380 is also parallel to the core rod 330 and is distributed at intervals. The driving end of the second driving member 360 is connected to the connecting frame 370.

[0068] Specifically, the connecting frame 370 is constructed as a connecting plate located outside the sliding frame 340. The sliding frame 340 is provided with a guide hole (not shown in the figure) for the driving end of the second driving member 360 to pass through. The driving end of the second driving member 360 passes through the guide hole and is connected to the connecting frame 370. The first guide rod 380 is horizontally connected to the sliding frame 340 and passes through the connecting frame 370.

[0069] With such a configuration, the driving end of the second driving member 360 drives the core rod 330 to slide in the horizontal direction relative to the sliding frame 340 by driving the connecting frame 370 to slide in the direction of the horizontal first guide rod 380, so that the core rod 330 will not form structural interference with the sliding frame 340 during the sliding process relative to the sliding frame 340. In addition, when the sliding frame 340 drives the support mold 320 to move in the direction of approaching or moving away from the support mold 210, the connecting frame 370 can synchronously drive the core rod 330 to approach or move away from the copper tube 500 on the support mold 210, ensuring that the copper tube 500 is accurately loaded, bent and unloaded in sequence.

[0070] In addition, the first guide rod 380 is configured to provide guidance for the connecting frame 370 to drive the core rod 330 to move in the horizontal direction, thereby ensuring the straightness of the movement of the core rod 330 relative to the sliding frame 340 and avoiding interference between the core rod 330 and the copper tube 500 on the support mold 210 during the movement of the core rod 330 relative to the sliding frame 340.

[0071] Further, see Figure 1 , Figure 3 and Figure 5The bending mechanism further includes an elastic buffer structure 400 , which is disposed between the sliding frame 340 and the rotating frame 310 , and is used to provide elastic buffering to the supporting mold 320 when the supporting mold 320 clamps the copper tube 500 on the supporting mold 210 .

[0072] It is not difficult to understand that, in the process of the sliding frame 340 driving the back mold 320 to move relative to the rotating frame 310 toward the direction close to the support mold 210 so as to clamp the copper tube 500 on the support mold 210, the back mold 320 and the sliding frame 340 will be subjected to the elastic force of the elastic buffer structure 400, so that the back mold 320 will slowly abut against and press the copper tube 500 located on the support mold 210, thereby reducing the probability of the copper tube 500 being over-pressed by the back mold 320 and causing hard damage, thereby ensuring the structural stability of the copper tube 500 during the clamping process by the back mold 320 and the support mold 210.

[0073] Further, see Figure 5 The elastic buffer structure 400 includes a first stopper 410, a second stopper 420, a compression elastic member 430 and a second guide rod 440. The first stopper 410 and the second stopper 420 are respectively arranged on the rotating frame 310 and the sliding frame 340. The second guide rod 440 is arranged on the second stopper 420 and passes through the first stopper 410. The compression elastic member 430 is clamped between the first stopper 410 and the second stopper 420 and is sleeved on the second guide rod 440.

[0074] Specifically, the compression elastic member 430 is configured as a compression spring, which is compression-sleeved on the second guide rod 440 and has two ends respectively abutting against the first stopper 410 and the second stopper 420 .

[0075] It can be understood that when the sliding frame 340 drives the support mold 320 to move relative to the rotating frame 310 in the direction close to the support mold 210 to clamp the copper tube 500 on the support mold 210, the compression elastic member 430 is compressed to provide elastic buffering to the support mold 320 and the sliding frame 340, so that the support mold 320 can be pressed against and pressed against the copper tube 500 on the support mold 210 at a relatively slow rate, thereby reducing the probability of the copper tube 500 being over-pressed by the support mold 320 and causing hard damage, thereby ensuring the structural stability of the copper tube 500 during the clamping process by the support mold 320 and the support mold 210.

[0076] The second guide rod 440 is configured to provide guidance for the sliding frame 340 to drive the support mold 320 to move relative to the rotating frame 310 toward the direction close to the support mold 210, thereby improving the linearity of the movement of the support mold 320 and allowing the support mold 320 to accurately and stably rest against the outer wall of the copper tube 500, thereby cooperating with the support mold 210 to stably clamp the copper tube 500.

[0077] In some embodiments of the present application, see 1. Figure 6 , Figure 7 and Figure 8 The bending mechanism also includes a first frame 100, and a rotating frame 310 is rotatably disposed on the first frame 100. A first limit block 110 and a second limit block 120 are respectively disposed on opposite sides of the first frame 100. The first limit block 110 and the second limit block 120 are located on the rotation path of the rotating frame 310 to cooperate in limiting the rotation position of the rotating frame 310.

[0078] Specifically, the first frame 100 includes a first bearing seat 160 and a second bearing seat 170 that are opposite and spaced apart, and a movable space for the bending die assembly 300 to be installed and rotated freely is formed between the first bearing seat 160 and the second bearing seat 170. The first limit block 110 and the second limit block 120 are respectively fixed on the first bearing seat 160 and the second bearing seat 170.

[0079] It should be noted that when the bending die assembly 300 is in an initial state as a whole, the rotating frame 310 of the bending die assembly 300 abuts against the first limit block 110. When the bending die assembly 300 is rotated by a preset bending angle relative to the first frame 100 as a whole, the rotating frame 310 of the bending die assembly 300 abuts against the second limit block 120.

[0080] In this way, the first frame 100 and the first limit block 110 and the second limit block 120 arranged on the first frame 100 cooperate to limit the rotation configuration of the rotating frame 310, thereby preventing the bending mold assembly 300 from excessively rotating and causing excessive bending and damage to the copper tube 500.

[0081] Further, see Figure 1 , Figure 3 and Figure 6 A third driving member 130 and a proximity switch 140 are provided on the first frame 100. The driving end of the third driving member 130 is connected to the rotating frame 310 to drive the rotating frame 310 to rotate relative to the first frame 100. The proximity switch 140 is used to detect whether the rotating frame 310 is rotated to a preset position. The proximity switch 140 is electrically connected to the third driving member 130.

[0082] Specifically, the rotating frame 310 is rotatably mounted on the first frame 100 via the rotating shaft 150 , and the proximity switch 140 includes a first in-position switch 141 and a second in-position switch 142 , which are relatively arranged at a position of the first frame 100 close to the rotating shaft 150 .

[0083] It is easy to understand that the first in-position switch 141 and the second in-position switch 142 respectively detect the initial position and the rotation position of the rotating shaft 150, thereby detecting the rotation angle of the rotating shaft 150, and further detecting whether the rotating frame 310 rotates to the preset position. When the first in-position switch 141 and the second in-position switch 142 cooperate to detect that the rotating frame 310 rotates to the preset position, the third driving member 130 obtains the detection signals of the first in-position switch 141 and the second in-position switch 142, thereby stopping driving the rotating frame 310 to rotate.

[0084] In this way, the rotating frame 310 is ensured to rotate accurately to the preset position, and the bending angle of the bent pipe section on the copper tube 500 is ensured to be accurate, thereby improving the production quality and product qualification rate of the elbows obtained by subsequently cutting the bent pipe section on the copper tube 500.

[0085] See also Figure 1 , Figure 2 , Figure 3 and Figure 6 In some embodiments of the present application, a plurality of parallel and spaced brackets 211 are provided on the support mold 210 , and a plurality of support molds 320 and a plurality of core rods 330 are correspondingly provided on the rotating frame 310 .

[0086] Specifically, all the brackets 211 on the support mold 210 can be distributed at equal intervals or at arbitrary intervals, and can be arranged according to actual production needs, without specific limitation.

[0087] It is not difficult to understand that by providing a plurality of parallel and spaced brackets 211 and a corresponding plurality of molds 320 and a plurality of core rods 330, the bending mechanism can complete the bending action on a plurality of copper tubes 500 at one time, thereby improving the bending efficiency of the copper tubes 500, and further improving the efficiency of subsequent cutting of the bent tube sections on the copper tubes 500 to obtain elbows, thereby improving the production efficiency of the elbows.

[0088] Also, see Figures 1 to 8 An embodiment of the present application also provides a pipe bending machine, which includes the bending mechanism of any of the above embodiments.

[0089] The pipe bending machine of the embodiment of the present application is equipped with the above-mentioned bending mechanism, so it also has the same effect brought by the above-mentioned bending mechanism, that is, through the cooperation of the support mold assembly 200 and the bending mold assembly 300, in the copper tube feeding stage, the core rod 330 on the bending mold assembly 300 provides positioning guidance for the copper tube 500, so that the copper tube 500 is accurately fed to the bracket 211 on the support mold 210. The bracket 211 cooperates with the support mold 320 on the bending mold assembly 300 to clamp the copper tube 500, so that the position of the copper tube 500 on the bracket 211 remains stable, so that the copper tube 500 is accurately fed. In the copper tube bending stage, the copper tube 500 is bent along the arc-shaped turning section 212 under the constraints of the support mold 320 and the core rod 330, so as to ensure the bending roundness quality of the copper tube 500. During the copper tube blanking stage, the core rod 330 can limit the rebound of the copper tube 500 before withdrawing from the copper tube 500, effectively reducing the rebound deformation of the copper tube 500 after bending, and ensuring the bending quality of the copper tube 500. At the same time, the core rod 330 and the mold 320 can successively break away from the limit constraints on the copper tube 500 after the copper tube 500 is bent, avoiding structural interference in the blanking of the bent copper tube 500, and ensuring accurate blanking of the bent copper tube. In this way, the probability of the elbow obtained by cutting the bent tube section on the copper tube 500 having a beveled mouth and uneven bottom ends is reduced, the rebound deformation of the elbow is effectively reduced, and the production quality of the elbow and the product qualification rate are improved.

[0090] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0091] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A bending mechanism, characterized in that: include: A support mold assembly comprises a support mold, wherein the support mold is provided with a support groove for supporting the copper tube, and the end of the support groove forms an arc-shaped turning section, and the arc-shaped turning section is used for bending the copper tube; The bending die assembly comprises a rotating frame, a support die arranged on the rotating frame, and a core rod arranged on the rotating frame, wherein the core rod is inserted into the bracket and used for sleeve-arranging the copper tube, and the support die can move relative to the rotating frame toward the support die to clamp the copper tube on the support die; The rotating frame can drive the supporting mold and the core rod to rotate relative to the supporting mold, so that the copper tube is bent along the arc-shaped turning section, and the core rod can move relative to the rotating frame to withdraw from the copper tube on the bracket.

2. The bending mechanism according to claim 1, characterized in that: The bending mold assembly also includes a sliding frame and a first driving member, the supporting mold is arranged on the sliding frame, and the sliding frame is slidably installed on the rotating frame. The first driving member is arranged on the rotating frame and connected to the sliding frame to drive the sliding frame to drive the supporting mold to move in a direction close to or away from the supporting mold.

3. The bending mechanism according to claim 2, characterized in that: The bending die assembly also includes a second driving member, which is arranged on the sliding frame and the driving end of the second driving member is connected to the core rod to drive the core rod to move along the straight line where the bracket is located, and the driving direction of the second driving member is perpendicular to the driving direction of the first driving member.

4. The bending mechanism according to claim 3, characterized in that: The bending mold assembly also includes a connecting frame and a first guide rod. The core rod is arranged on the connecting frame and is located at the bottom of the supporting mold. The first guide rod is arranged on the sliding frame and passes through the connecting frame. The first guide rod is also parallel to the core rod and distributed at intervals. The driving end of the second driving member is connected to the connecting frame.

5. The bending mechanism according to claim 2, characterized in that: The bending mechanism further comprises an elastic buffer structure, which is arranged between the sliding frame and the rotating frame and is used for providing elastic buffer to the supporting mold when the supporting mold clamps the copper tube to the supporting mold.

6. The bending mechanism according to claim 5, characterized in that: The elastic buffer structure includes a first stop block, a second stop block, a compression elastic member and a second guide rod, the first stop block and the second stop block are respectively arranged on the rotating frame and the sliding frame, the second guide rod is arranged on the second stop block and passes through the first stop block, and the compression elastic member is clamped between the first stop block and the second stop block and is sleeved on the second guide rod.

7. The bending mechanism according to claim 1, characterized in that: The bending mechanism also includes a first frame, the rotating frame is rotatably disposed on the first frame, and a first limit block and a second limit block are respectively disposed on opposite sides of the first frame. The first limit block and the second limit block are located on the rotation path of the rotating frame to cooperate in limiting the rotation position of the rotating frame.

8. The bending mechanism according to claim 7, characterized in that: A third driving member and a proximity switch are provided on the first frame. The driving end of the third driving member is connected to the rotating frame to drive the rotating frame to rotate relative to the first frame. The proximity switch is used to detect whether the rotating frame rotates to a preset position. The proximity switch is electrically connected to the third driving member.

9. The bending mechanism according to any one of claims 1 to 8, characterized in that: The support mold is provided with a plurality of parallel and spaced support grooves, and the rotating frame is correspondingly provided with a plurality of support molds and a plurality of core rods.

10. A pipe bending machine, characterized in that: It comprises a bending mechanism as described in any one of claims 1 to 9.

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