Rectangular pipe bending machine

Abstract

The utility model discloses a rectangular pipe bending machine which comprises a machine base, a die holder is installed on the machine base in a rotating mode, a die is detachably installed on the die holder, a clamping mechanism is installed on the die holder, a core rod mechanism and a boosting mechanism are installed on the machine base, and the core rod mechanism comprises a core rod installation structure installed on the machine base. A first connecting rod is detachably installed on the core rod installation structure, a second connecting rod is detachably installed at the end of the first connecting rod, a core head is arranged at the end of the second connecting rod, and a positioning blocking table is fixedly arranged on the first connecting rod or the second connecting rod. The side, close to the core head, of the positioning blocking table on the second connecting rod is sleeved with a freely-drooping positioning mark pipe. According to the rectangular pipe bending device, rapid and accurate positioning can be achieved, and bending machining can be carried out on different rectangular pipes more conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe bending equipment, in particular to a rectangular pipe bending machine. Background Art

[0002] The main frame of the tricycle frame is mostly made of rectangular tubes, including the front beam, side beam, tail beam, and even other reinforcement beams and functional beams. Most of these rectangular tubes need to be bent, and the semi-automatic hydraulic tube bending machine is one of the equipment for rectangular tube bending. The equipment is mainly composed of a mold, a clamping mechanism, a booster mechanism, and a core rod mechanism. Figures 9 to 12 As shown, during operation, the rectangular tube to be processed is sleeved onto the core head in the core rod mechanism, and the first straight section of the rectangular tube that does not need to be bent is straightened; the rectangular tube is placed against the mold, and the clamping mechanism clamps the other straight section of the rectangular tube on the mold, and the boosting mechanism rests on the bent part of the rectangular tube. The mold starts to rotate, and the part clamped by the clamping mechanism drives the rectangular tube to gradually bend around the mold; in this process, the boosting mechanism is pushed out at the same time, and the rest of the rectangular tube is pushed to cooperate with the rotation speed of the mold to avoid wrinkles and twisting deformation of the tube body.

[0003] In actual production, the positioning of the bending position of the rectangular tube is to mark the starting point of the bending of the rectangular tube, and to clamp the marked position with a clamping mechanism for positioning. This method of measuring the length in advance and then marking is relatively cumbersome, and is easily affected by human factors and produces errors during actual positioning, which will cause more matching problems in the later assembly and welding process of the workpiece. In addition, the rectangular tubes used in different beam parts of the tricycle have different overall tube lengths, bending positions, etc. For mass-produced tricycle frames, large-scale bending processing will further highlight the cumbersome problem of marking, and the error rate will be higher. For this reason, whether it is possible to achieve quick and accurate positioning on the existing semi-automatic hydraulic pipe bender and meet the needs of different rectangular tube bending processing is a problem that needs to be solved urgently in the current semi-automatic hydraulic pipe bender. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a rectangular tube bending machine which can realize quick and accurate positioning and can more conveniently perform bending processing on different rectangular tubes.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a rectangular tube bending machine, including a machine base, a die base is rotatably installed on the machine base, a coaxially arranged die is detachably installed on the die base, a clamping mechanism fixedly arranged relative to the die is installed on the die base, a core rod mechanism extending to the die is installed on the machine base, a booster mechanism is provided on the machine base at a side of the core rod mechanism away from the die, the core rod mechanism includes a core rod mounting structure installed on the machine base, a first connecting rod is detachably installed on the core rod mounting structure, a second connecting rod is detachably installed on the end of the first connecting rod, a core head is provided at the end of the second connecting rod, a positioning stop is fixedly provided on the first connecting rod or the second connecting rod, and a freely hanging positioning mark tube is provided on the side of the second connecting rod located on the positioning stop close to the core head.

[0006] As a preferred technical solution, a connecting sleeve is fixedly provided on the second connecting rod, the first connecting rod is inserted into the connecting sleeve, and a second radial bolt for fastening the first connecting rod is installed on the connecting sleeve.

[0007] As a preferred technical solution, the connecting sleeve also serves as the positioning stop.

[0008] As a preferred technical solution, a rotational separation hole for the second connecting rod to be installed is provided on the core head, and the rotational separation hole is clearance-matched with the second connecting rod; a nut mounting opening is radially penetrated at the inner end of the rotational separation hole on the core head, and the second connecting rod is passed through the end of the nut mounting opening to fix a limiting nut on it.

[0009] As a preferred technical solution, at least one auxiliary supporting mechanism is provided on the machine base between the core rod mounting structure and the mold.

[0010] As a preferred technical solution, the auxiliary support mechanism includes a support mounting tube fixedly arranged on the machine base, a support upright pole is installed through the support mounting tube, a support cross bar extending laterally to the bottom of the core rod mechanism is fixedly arranged on the top end of the support upright pole, and an auxiliary support portion is provided on the support cross bar; a support fastening bolt for fastening the support upright pole is installed on the support mounting tube.

[0011] As a preferred technical solution, the cross section of the support mounting tube is rectangular, and the cross section of the support upright is a rectangle that matches the support mounting tube.

[0012] As a preferred technical solution, the core rod mounting structure includes an advance and retreat drive cylinder installed on the machine base, a connecting rod insertion hole is fixedly provided on the driving end of the advance and retreat drive cylinder, the first connecting rod is inserted into the connecting rod insertion hole, and a first radial bolt for tightening the first connecting rod is provided on the driving end of the advance and retreat drive cylinder.

[0013] Due to the adoption of the above technical scheme, a rectangular tube bending machine includes a machine base, a die base is rotatably mounted on the machine base, a coaxially arranged die is detachably mounted on the die base, a clamping mechanism fixedly arranged relative to the die is mounted on the die base, a core rod mechanism extending to the die is mounted on the machine base, a boosting mechanism is provided on the machine base at a side of the core rod mechanism away from the die, the core rod mechanism includes a core rod mounting structure mounted on the machine base, a first connecting rod is detachably mounted on the core rod mounting structure, a second connecting rod is detachably mounted on the end of the first connecting rod, a core head is provided at the end of the second connecting rod, a positioning stop is fixedly provided on the first connecting rod or the second connecting rod, and a freely hanging positioning mark tube is provided on the side of the second connecting rod located on the positioning stop close to the core head. The utility model improves the positioning of rectangular tubes based on a core rod mechanism, wherein the second connecting rod is detachably mounted on the first connecting rod to form a core rod connecting the core head, and then a positioning stop is set on the first connecting rod or the second connecting rod, and then the free-hanging positioning mark tube mounted on the second connecting rod is used to form the positioning of the end of the rectangular tube after it is mounted on the core head. Therefore, the utility model does not need to measure and mark on the rectangular tube, and the positioning can be quickly completed by mounting it on the core head and leaning against the positioning mark tube. The positioning is fast and accurate. The replacement of the first connecting rod with different lengths and the replacement of the positioning mark tube with different lengths become two mutually coordinated measures to change the positioning position. The positioning position is convenient and quick to adjust, and the first connecting rod and the positioning mark tube are easy to obtain, which makes the utility model more convenient to use for bending processing on different rectangular tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following drawings are only intended to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0015] Figure 1 This is a top view of the structural principle diagram of an embodiment of the utility model;

[0016] Figure 2 yes Figure 1 Schematic diagram of AA structure;

[0017] Figure 3 yes Figure 2 An enlarged structural diagram of the connection between the first connecting rod and the core rod mounting structure;

[0018] Figure 4yes Figure 2 A schematic diagram of the enlarged structure of the second connecting rod and the core head;

[0019] Figure 5 yes Figure 4 Schematic diagram of BB structure;

[0020] Figure 6 yes Figure 1 An enlarged schematic diagram of one of the auxiliary support mechanisms;

[0021] Figure 7 yes Figure 6 Schematic diagram of CC structure;

[0022] Figure 8 This is a principle diagram of the embodiment of the utility model when positioning a rectangular tube with a longer straight line segment after adjusting the positioning position;

[0023] Fig. 9 This is the structural principle diagram of the existing semi-automatic hydraulic pipe bending machine;

[0024] Fig.10 yes Fig. 9 A state diagram in which the middle clamping mechanism clamps the rectangular tube and the boosting mechanism abuts against the rectangular tube;

[0025] Fig.11 yes Fig.10 State diagram after rectangular tube bending;

[0026] Fig.12 yes Fig.11 The state diagram of the clamping mechanism releasing the clamping and the boosting mechanism leaving the rectangular tube after the bending process.

[0027] In the figure: 1-machine base; 11-mold; 12-clamping mechanism; 13-core rod mechanism; 14-boosting mechanism; 2-core rod mounting structure; 21-advance and retreat driving cylinder; 22-connecting rod plug-in hole; 23-first radial bolt; 3-first connecting rod; 4-second connecting rod; 41-connecting sleeve; 42-second radial bolt; 43-positioning stop; 44-positioning mark tube; 5-core head; 51-rotational separation hole; 52-nut mounting opening; 53-limiting nut; 6-auxiliary support mechanism; 61-support mounting tube; 62-support vertical rod; 63-support horizontal rod; 64-auxiliary support part; 65-support fastening bolt; 9-rectangular tube; 91-mark. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and examples. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Needless to say, those skilled in the art will recognize that the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and descriptions are illustrative in nature and are not intended to limit the scope of protection of the claims.

[0029] like Figure 1 As shown, the rectangular tube bending machine includes a machine base 1, on which a die base is rotatably mounted, on which a coaxially arranged die 11 is detachably mounted, on which a clamping mechanism 12 fixedly arranged relative to the die 11 is mounted, on which a core rod mechanism 13 extending to the die 11 is mounted, and on which a boosting mechanism 14 is provided on the machine base 1 on the side of the core rod mechanism 13 away from the die 11. The rectangular tube 9 to be processed is sleeved onto the core head 5 in the core rod mechanism 13, and the rectangular tube 9 is placed against the die 11. The clamping mechanism 12 clamps the outer straight section of the rectangular tube 9 on the die 11, and the boosting mechanism 14 is pressed against the part of the rectangular tube 9 to be bent, and the die 11 starts to rotate, and the part clamped by the clamping mechanism 12 drives the rectangular tube 9 to bend gradually around the die 11. In this process, the boosting mechanism 14 is pushed out at the same time, and finally the rectangular tube 9 is bent without deformation. The above structural principle is a well-known technology in the art and will not be repeated here.

[0030] like Figures 1 to 3 As shown, the core rod mechanism 13 of this embodiment includes a core rod mounting structure 2 mounted on the machine base 1, and a first connecting rod 3 is detachably mounted on the core rod mounting structure 2. Since the core rod mechanism 13 needs to be moved forward and backward before and after the bending process to cooperate with the placement and removal of the rectangular tube 9, the core rod mounting structure 2 of this embodiment also adopts a structure that can be driven forward and backward, specifically: the core rod mounting structure 2 includes an advance and retreat drive cylinder 21 mounted on the machine base 1, and a connecting rod insertion hole 22 is fixedly provided on the driving end of the advance and retreat drive cylinder 21, and the first connecting rod 3 is inserted into the connecting rod insertion hole 22, and a first radial bolt 23 for fastening the first connecting rod 3 is provided on the driving end of the advance and retreat drive cylinder 21. The driving end of the advance and retreat drive cylinder 21 is fastened and connected with the first connecting rod 3 using radial bolts, and the first connecting rod 3 is inserted into the connecting rod insertion hole 22, which makes it easy for this end of the first connecting rod 3 to form a simple rod-shaped structure, which is convenient for material collection.

[0031] like Figure 1 , Figure 2 and Figure 4As shown, the end of the first connecting rod 3 is detachably mounted with a second connecting rod 4, and the detachable mounting here is also fastened and connected by radial bolts, specifically: a connecting sleeve 41 is fixedly provided on the second connecting rod 4, and the first connecting rod 3 is inserted into the connecting sleeve 41, and a second radial bolt 42 for fastening the first connecting rod 3 is installed on the connecting sleeve 41. Here, the first connecting rod 3 is also inserted, so the first connecting rod 3 as a whole can be directly cut into the required length using existing round steel and other profiles, and it is convenient to obtain materials.

[0032] like Figure 1 , Figure 2 and Figure 4 As shown, a core head 5 is provided at the end of the second connecting rod 4. Conventionally, the cross section of the core head 5 is also rectangular, and it is used to straighten the straight section of the rectangular tube 9 after the rectangular tube 9 is installed. A positioning stop 43 is fixedly provided on the first connecting rod 3 or the second connecting rod 4, and a freely hanging positioning mark tube 44 is installed on the side of the positioning stop 43 close to the core head 5 on the second connecting rod 4.

[0033] The positioning stop 43 and the positioning mark tube 44 are used to position the end face of the rectangular tube 9 close to the forward and backward driving cylinder 21. When in use, the rectangular tube 9 is put on the core head 5 and pushed toward the forward and backward driving cylinder 21 until it abuts against the positioning mark tube 44 and the positioning mark tube 44 also abuts against the positioning stop 43, thus completing the positioning of the inner end face of the rectangular tube 9. In this process, if Figure 5 As shown, the free droop of the positioning mark tube 44 makes it easy for it to intersect with the tube wall in the cross section of the rectangular tube 9, so that the rectangular tube 9 can actually abut against each other, and the free droop setting makes it easy to remove it from the core head 5, so as to facilitate the replacement of positioning mark tubes 44 of different lengths to meet the bending processing requirements of rectangular tubes 9 of different lengths and different bending positions. After the rectangular tube 9 is set and positioned, the clamping mechanism 12 clamps, the boosting mechanism 14 abuts, and the mold 11 starts to rotate to perform the bending operation. In this process, the positioning mark tube 44 and the like will not move with the rectangular tube 9, and will not affect the bending process. After the bending is completed, the clamping mechanism 12 releases the clamping, the boosting mechanism 14 returns to its position, and the core head 5 is driven backward by the forward and backward driving cylinder 21, and the bent workpiece is easy to remove. Before the next rectangular tube 9 is set, the core head 5 is driven to feed by the forward and backward driving cylinder 21, and the above bending process is continued.

[0034] Among them, for the second connecting rod 4 of this embodiment, the connecting sleeve 41 is provided. Figure 2 and Figure 4 As shown, the connecting sleeve 41 also serves as the positioning stop 43 to simplify the structure.

[0035] Preferably, if Figure 1 and Figure 8 As shown, at least one auxiliary support mechanism 6 is provided on the machine base 1 between the core rod mounting structure 2 and the mold 11 to provide auxiliary support for the longer core rod mechanism 13 to prevent it from bending in the middle due to its own weight, thereby ensuring accurate positioning and reliable straightening at the core head 5.

[0036] like Figure 6 and Figure 7 As shown, the auxiliary support mechanism 6 in this embodiment includes a support mounting tube 61 fixedly arranged on the machine base 1, a support vertical rod 62 is installed through the support mounting tube 61, a support cross bar 63 extending laterally to the bottom of the core rod mechanism 13 is fixed on the top of the support vertical rod 62, and an auxiliary support portion 64 is provided on the support cross bar 63; a support fastening bolt 65 for fastening the support vertical rod 62 is installed on the support mounting tube 61.

[0037] By fitting the support upright 62 and the support mounting tube 61 and fastening the support fastening bolt 65, the support upright 62 can be easily adjusted in height, and the auxiliary support portion 64 can be easily adjusted in height, which is specifically manifested as follows: after loosening the support fastening bolt 65, the support upright 62 can slide relative to the support mounting tube 61, thereby adjusting the auxiliary support portion 64 to the desired height. After adjustment, the support fastening bolt 65 can be re-tightened to the support upright 62.

[0038] Accordingly, this embodiment is convenient for adapting whether the supporting rod is a connecting rod or a rectangular tube 9 for auxiliary support. This adaptation function is specifically embodied in, for example Figure 1 As shown, when the straight section of the rectangular tube 9 close to the forward and backward driving cylinder 21 is shorter, the first connecting rod 3 and / or the second connecting rod 4 are on the auxiliary support mechanism 6, that is, the auxiliary support mechanism 6 only plays an auxiliary supporting role for the connecting rod; Figure 8 As shown, when the straight section of the rectangular tube 9 close to the advance and retreat drive cylinder 21 is longer, after the rectangular tube 9 is put on the core head 5, it will at least be on the auxiliary support mechanism 6 close to the mold 11, that is, at this time the auxiliary support mechanism 6 plays an auxiliary supporting role for the rectangular tube 9.

[0039] Preferably, the cross section of the support installation tube 61 is rectangular, and the cross section of the support vertical rod 62 is a rectangle that matches the support installation tube 61. This rectangular structure can improve the anti-deflection ability of the support cross bar 63 in the horizontal direction, and further ensure the auxiliary support function. The auxiliary support portion 64 can be directly implemented by a part of the support cross bar 63, or by a support roller installed on the support cross bar 63. This embodiment only illustrates the latter.

[0040] In actual use, the first connecting rod 3 and the second connecting rod 4 form a longer core rod, which has weaker anti-bending, anti-deflection and anti-torsion capabilities. The auxiliary support mechanism 6 only plays an auxiliary role in anti-bending. When the rectangular tube 9 is not put on the core head 5, the core head 5 is easy to reach the edge of the mold 11 or even outside the mold 11 due to the weak anti-deflection ability of the longer core rod. This deflection process will cause the core head 5 to rotate due to the friction between the auxiliary support part 64 and the gravity of the core head 5 itself; this rotation will be transmitted to the core rod, causing the radial bolt fastening positions at both ends of the first connecting rod 3 to move, especially axial displacement. This axial displacement will cause the distance of the positioning stop 43 relative to the mold 11 to change, that is, the final positioning position of the rectangular tube 9 will change. If it is not detected, scrapped parts will appear in the subsequent bending process.

[0041] For this reason, Figure 4 As shown, the core head 5 of this embodiment is provided with a rotation separation hole 51 for the second connecting rod 4 to pass through, and the rotation separation hole 51 is clearance-matched with the second connecting rod 4; the core head 5 is provided with a nut installation opening 52 radially penetrating at the inner end of the rotation separation hole 51, and the second connecting rod 4 passes through the end of the nut installation opening 52 and is fixedly installed with a limit nut 53. In this way, the rotation of the core head 5 will not be transmitted to the core rod part, ensuring reliable positioning.

[0042] Among them, the end of the second connecting rod 4 and the nut mounting opening 52 are far away from the side wall of the positioning mark tube 44, and the limit nut 53 and the nut mounting opening 52 are close to the side wall of the positioning mark tube 44, and the gap between them is preferably 1 to 2 mm, so that the core head 5 can be approximately axially fixed with the core rod while achieving a rotational separation effect.

[0043] This embodiment improves the positioning of the rectangular tube 9 based on the core rod mechanism 13, wherein the second connecting rod 4 is detachably mounted on the first connecting rod 3 to form a core rod connected to the core head 5, and then a positioning stop 43 is set on the second connecting rod 4, and then the free-hanging positioning mark tube 44 set on the second connecting rod 4 is used to form the positioning of the end of the rectangular tube 9 after it is set on the core head 5. Therefore, this embodiment does not need to measure and mark 91 on the rectangular tube 9, and the positioning can be quickly completed by setting it on the core head 5 and leaning against the positioning mark tube 44. The positioning is fast and accurate. The replacement of the first connecting rod 3 with different lengths and the replacement of the positioning mark tube 44 with different lengths become two mutually coordinated measures to change the positioning position. The positioning position is convenient and fast to adjust, and the first connecting rod 3 and the positioning mark tube 44 are easy to obtain, which makes this embodiment more convenient to use for bending processing on different rectangular tubes 9.

[0044] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A rectangular tube bending machine, comprising a machine base, a die base is rotatably mounted on the machine base, a coaxially arranged die is detachably mounted on the die base, a clamping mechanism fixedly arranged relative to the die is mounted on the die base, a core rod mechanism extending to the die is mounted on the machine base, and a boosting mechanism is provided on the machine base at a side of the core rod mechanism away from the die, characterized in that: The core rod mechanism includes a core rod mounting structure installed on the machine base, a first connecting rod is detachably mounted on the core rod mounting structure, a second connecting rod is detachably mounted on the end of the first connecting rod, a core head is provided at the end of the second connecting rod, a positioning stop is fixedly provided on the first connecting rod or the second connecting rod, and a freely hanging positioning mark tube is mounted on the side of the positioning stop close to the core head on the second connecting rod.

2. The rectangular tube bender according to claim 1, characterized in that: A connecting sleeve is fixedly provided on the second connecting rod, the first connecting rod is inserted into the connecting sleeve, and a second radial bolt for fastening the first connecting rod is installed on the connecting sleeve.

3. The rectangular tube bender according to claim 2, characterized in that: The connecting sleeve also serves as the positioning stop.

4. The rectangular tube bender according to claim 1, characterized in that: A rotation separation hole for the second connecting rod to be installed is provided on the core head, and the rotation separation hole is clearance-matched with the second connecting rod; a nut mounting opening is radially penetrated at the inner end of the rotation separation hole on the core head, and the second connecting rod is passed through the end of the nut mounting opening to fix a limiting nut on it.

5. The rectangular tube bender according to claim 1, characterized in that: At least one auxiliary supporting mechanism is provided on the machine base between the core rod mounting structure and the mold.

6. The rectangular tube bender according to claim 5, characterized in that: The auxiliary support mechanism includes a support mounting tube fixedly arranged on the machine base, a support upright rod is installed through the support mounting tube, a support cross bar extending laterally to the bottom of the core rod mechanism is fixedly arranged on the top end of the support upright rod, and an auxiliary support part is arranged on the support cross bar; a support fastening bolt for fastening the support upright rod is installed on the support mounting tube.

7. The rectangular tube bender according to claim 6, characterized in that: The cross section of the support installation tube is rectangular, and the cross section of the support upright is a rectangle that matches the support installation tube.

8. The rectangular tube bender according to claim 1, characterized in that: The core rod mounting structure includes an advance and retreat drive cylinder mounted on the machine base, a connecting rod insertion hole is fixedly provided on the driving end of the advance and retreat drive cylinder, the first connecting rod is inserted into the connecting rod insertion hole, and a first radial bolt for tightening the first connecting rod is provided on the driving end of the advance and retreat drive cylinder.

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