A connecting rod driven die clamping mechanism and a pipe bender

Abstract

The present invention discloses a connecting rod-driven die clamping mechanism and a pipe bender, which relate to the technical field of pipe benders and include: a drive box equipped with a fixed die and a swing arm, and a die closing seat accommodated in an open slot of the swing arm. A moving die assembled on the die closing seat moves synchronously with the die closing seat to realize die closing or die opening with the fixed die. Through the coordinated movement of a driven rod, a crank rod and a transmission rod, the linear motion of a telescopic mechanism on the die closing seat is converted into the rotational motion of the die closing seat. On this basis, the driven rod is equipped with a separable driven position rod, and the driven position rod and the driven rod are threadedly connected through a first threaded shaft; while the crank rod is equipped with a separable driving position rod, and the crank rod and the driving position rod are threadedly connected through a second threaded shaft. Thus, by turning the first threaded shaft and the second threaded shaft, the height and the horizontal plane of the die closing seat can be adjusted, solving the problem that the fixed die and the moving die cannot be accurately closed during the assembly process.

Description

Technical Field

[0001] The invention relates to the technical field of pipe bending machines, and in particular to a connecting rod driven die clamping mechanism and a pipe bending machine. Background Art

[0002] During the mold closing process of the pipe bending machine, a large force is required to close the mold tightly to ensure the accuracy and quality of the bent pipe. By driving the connecting rod, its force-increasing characteristics can be utilized to obtain a larger mold closing force with a smaller output force, thereby meeting the mold closing requirements.

[0003] The connecting rod drive mechanism is usually composed of some simple rods connected by hinges. Reasonable design of the rod length can accurately control the mold closing position, ensure the accurate closing and opening of the mold, and improve the operating accuracy and reliability of the pipe bending machine.

[0004] The kinematic and dynamic analysis of the connecting rod drive mechanism involves multiple parameters and complex mathematical models. During the design process, it is necessary to accurately calculate the length of each rod and its connection position based on the mold requirements of the pipe bending machine.

[0005] However, in the actual process of assembling the connecting rod drive mechanism, the processed rod length or rod connection position may be different from the designed parameters, which will affect the mold closing of the pipe bending machine. Therefore, repeated adjustments and optimizations are required, such as re-specifying the connection position or replacing new rods, which increases the difficulty and workload of assembly. Summary of the invention

[0006] One of the purposes of the present invention is to solve the problem in the prior art that in the actual assembly process of the connecting rod drive mechanism, the length of the processed rod or the connecting position of the rod is different from the designed parameters, thereby affecting the mold clamping of the pipe bending machine.

[0007] A second object of the present invention is to provide a pipe bending machine.

[0008] In order to achieve one of the above-mentioned purposes, the present invention adopts the following technical solution: a connecting rod driven mold clamping mechanism, comprising: a driving box equipped with a fixed mold and a swing arm, and a clamping seat accommodated in the open groove of the swing arm, and a movable mold assembled on the clamping seat moves synchronously with the clamping seat to achieve clamping or parting with the fixed mold.

[0009] The inner wall of the open groove of the swing arm is hinged to the driven rod and the crank rod, the driven position rod located on the driven rod is hinged to the mold base, and a first threaded shaft is threadedly connected between the driven position rod and the driven rod, and the first threaded shaft is moved to adjust the distance between the driven rod and the driven position rod.

[0010] The driving rod on the crank rod is hinged to the mold clamping seat, and a second threaded shaft is threadedly connected between the driving rod and the crank rod. The second threaded shaft is moved to adjust the distance between the driving rod and the crank rod.

[0011] The transmission rod hinged on the crank rod side is hinged to the telescopic rod of the telescopic mechanism fixed in the open groove of the swing arm. The crank rod and the driven rod push or pull the transmission rod through the telescopic mechanism to achieve synchronous action, so as to drive the mold base to shift, and then drive the movable mold and the fixed mold to separate or close the mold.

[0012] In the above technical scheme, in the embodiment of the present invention, when the fixed mold and the movable mold are in the clamping state, when the telescopic mechanism pushes the transmission rod by extending the telescopic rod, the extension of the telescopic rod is biased and close to the crank rod. Therefore, the transmission rod pushes the crank rod, causing the crank rod to rotate clockwise with its own hinge position as the fixed point, driving the driving rod and the clamping seat to deflect. At the same time, the clamping seat drives the driven rod to rotate clockwise with its own hinge position as the fixed point, causing the driven rod and the crank rod to produce synchronous movements to ensure the stable deflection movement of the clamping seat and realize the separation of the fixed mold and the movable mold.

[0013] When the fixed mold and the movable mold are in the mold-parting state, when the telescopic mechanism pulls the transmission rod through the telescopic rod, the telescopic rod moves away from the crank rod, and the transmission rod pulls the crank rod to rotate counterclockwise with its own hinge position as the fixed point, driving the driving rod and the mold clamping seat to deflect. At the same time, the mold clamping seat drives the driven rod to rotate counterclockwise with its own hinge position as the fixed point, so that the driven rod and the crank rod produce synchronous movements to ensure the stable deflection movement of the mold clamping seat and realize the clamping of the fixed mold and the movable mold.

[0014] For example, during the assembly of the pipe bending machine, it is found through a mold closing test of the fixed mold and the movable mold that the fixed mold and the movable mold cannot be accurately closed, resulting in a height misalignment of the circular hole formed after the mold closing. The first threaded shaft and the second threaded shaft are then moved to adjust the distance between the driven rod and the driven position rod, as well as the distance between the driving position rod and the crank rod, so as to adjust the height and horizontal plane of the mold closing seat to solve the height misalignment of the circular hole formed after the mold closing.

[0015] The beneficial effects of the present invention are as follows: through the coordinated movement of the driven rod, the crank rod and the transmission rod, the linear movement of the telescopic mechanism on the mold base is converted into the rotational movement of the mold base, on this basis, the driven rod is equipped with a detachable driven position rod, and the driven position rod is threadedly connected to the driven rod through a first threaded shaft; and the crank rod is equipped with a detachable driving position rod, and the crank rod is threadedly connected to the driving position rod through a second threaded shaft. In this way, the height of the mold base and its horizontal plane can be adjusted by toggling the first threaded shaft and the second threaded shaft, thereby solving the problem that the fixed mold and the movable mold cannot be accurately molded during the assembly process.

[0016] It should be noted that in the prior art, the length of the processed rod or the connection position of the rod (the rod can be understood as the above-mentioned driven rod and crank rod) is different from the designed parameters, which usually affects the height and horizontal plane of the mold clamping seat, thereby affecting the precise mold clamping. The problem of inaccurate rod length and inaccurate connection position can be compensated by adjusting the rod length.

[0017] Furthermore, in an embodiment of the present invention, the telescopic mechanism is a pneumatic cylinder, an electric cylinder, or a hydraulic cylinder.

[0018] Furthermore, in an embodiment of the present invention, a gear shaft connected to the motor is provided in the driving box, and the fixed mold and the swing arm coaxially fixed on the gear shaft are rotated by the motor.

[0019] Furthermore, in an embodiment of the present invention, a semicircular groove is provided on the mating surfaces of the fixed mold and the movable mold. After the fixed mold and the movable mold are mated, the semicircular groove of the fixed mold and the semicircular groove of the movable mold form a complete circular structure.

[0020] Furthermore, in an embodiment of the present invention, a sliding seat slidably mounted on the mold clamping seat and a fixed seat fixedly mounted on the mold clamping seat retain a gap, the movable mold is fixed on the sliding seat, and a bolt is provided between the sliding seat and the fixed seat. By tightening the bolt, the distance between the sliding seat and the fixed seat is adjusted.

[0021] Furthermore, in an embodiment of the present invention, a first internal thread groove connected to the first threaded shaft is provided on the opposite surfaces of the driven position rod and the driven rod member, and open grooves are provided on both sides of the first internal thread groove so that the side ends of the first threaded shaft are exposed outside the driven position rod and the driven rod member, so as to better move the first threaded shaft.

[0022] The opposite surfaces of the driving rod and the crank rod are provided with a second internal thread groove connected to the second threaded shaft, and open grooves are provided on both sides of the second internal thread groove to expose the side ends of the second threaded shaft outside the driving rod and the crank rod for better moving the second threaded shaft.

[0023] To achieve the second of the above-mentioned objectives, the present invention adopts the following technical solution: a pipe bender, which has the link-driven clamping die mechanism described in one of the above-mentioned objectives of the present invention.

[0024] Further, in the embodiment of the present invention, an additional plate is fixed on the outer side surface of the swing arm of the pipe bender. A guide rail is provided on the additional plate, and a power connection for a cutting saw blade and a motor is arranged on a guide seat disposed on the guide rail. The lower end of the cutting saw blade is received between the die clamping seat of the pipe bender and the additional plate.

[0025] A driving cylinder fixed at the end of the guide rail is connected to the guide seat. The driving cylinder pushes the guide seat to linearly move along the guide rail, and the cutting saw blade driven by the motor on the guide seat cuts off the pipe material that extends out of the fixed die of the pipe bender and has been bent.

[0026] Even further, in the embodiment of the present invention, the guide seat is higher than the die clamping seat.

[0027] Even further, in the embodiment of the present invention, a threaded hole is provided on the outer side surface of the swing arm. The additional plate is connected to the threaded hole by a screw to fix the additional plate on the outer side surface of the swing arm. Description of the Drawings

[0028] Figure 1 It is a three-dimensional schematic diagram of the pipe bender in the embodiment of the present invention.

[0029] Figure 2 It is a split die schematic diagram of the pipe bender in the embodiment of the present invention after making a pipe bending movement.

[0030] Figure 3 It is a die clamping schematic diagram of the link-driven clamping die mechanism in the embodiment of the present invention.

[0031] Figure 4 It is a split die schematic diagram of the link-driven clamping die mechanism in the embodiment of the present invention.

[0032] Figure 5 It is a three-dimensional schematic diagram of the driven member in the embodiment of the present invention.

[0033] Figure 6 It is a three-dimensional schematic diagram of the pipe bender in the embodiment of the present invention equipped with a cutting saw blade.

[0034] 10. Driving box, 11. Fixed die, 12. Swing arm;

[0035] 20. Die clamping seat, 21. Moving die, 22. Sliding seat, 23. Fixed seat, 24. Bolt;

[0036] 30. Driven member, 31. Driven position rod, 32. First threaded shaft;

[0037] 40. Crank rod member, 41. Driving position rod, 42. Second threaded shaft, 43. Transmission rod;

[0038] 50. Telescopic mechanism, 51. Telescopic rod;

[0039] 60. Additional plate, 61. Guide rail, 62. Guide seat, 63. Driving cylinder, 64. Cutting saw blade, 65. Motor. Detailed implementation manners

[0040] In order to clearly and completely describe the objectives, technical solutions of the present invention and make the advantages more clearly understood, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0041] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 to the present invention. In addition, the terms "one", "first", "second", "third", "fourth", "fifth", "sixth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0043] For the purpose of simplicity and illustration, the principles of the embodiments are mainly described by referring to examples. In the following description, many specific details are set forth to provide a thorough understanding of the embodiments. However, it is obvious that for those of ordinary skill in the art, these embodiments may not be limited to these specific details in practice. In some instances, the structures commonly applied to pipe benders are not described in detail to avoid unnecessarily making these embodiments difficult to understand. Additionally, all embodiments can be used in combination with each other. Example 1

[0044] It should be noted that the drawings in the specification are the contents of the specification. The structural shapes, connection relationships, matching relationships, and positional relationships that can be obtained without any doubt in the drawings in the specification should be understood as the contents of the specification.

[0045] A connecting rod driven clamping mechanism, such as Figure 1 , Figure 2 As shown, it comprises: a driving box 10 equipped with a fixed mold 11 and a swing arm 12, and a clamping base 20 accommodated in the open groove of the swing arm 12, and a movable mold 21 assembled on the clamping base 20 moves synchronously with the clamping base 20 to achieve clamping or parting with the fixed mold 11.

[0046] like Figure 3 , Figure 5 As shown, the inner wall of the open groove of the swing arm 12 is hinged to the driven rod 30 and the crank rod 40, and the driven position rod 31 located on the driven rod 30 is hinged to the mold base 20. The first threaded shaft 32 is threadedly connected between the driven position rod 31 and the driven rod 30. The first threaded shaft 32 is moved to adjust the distance between the driven rod 30 and the driven position rod 31.

[0047] The driving rod 41 on the crank rod 40 is hinged to the mold base 20 , and a second threaded shaft 42 is threadedly connected between the driving rod 41 and the crank rod 40 . The second threaded shaft 42 is moved to adjust the distance between the driving rod 41 and the crank rod 40 .

[0048] like Figure 4 As shown, the transmission rod 43 hinged on the side of the crank rod 40 is hinged to the telescopic rod 51 of the telescopic mechanism 50 fixed in the open groove of the swing arm 12, and the crank rod 40 and the driven rod 30 achieve synchronous action by pushing or pulling the transmission rod 43 through the telescopic mechanism 50, so as to drive the mold base 20 to deflect, and then drive the movable mold 21 and the fixed mold 11 to separate or close the mold.

[0049] Specifically, if Figure 3 As shown, when the fixed mold 11 and the movable mold 21 are in the mold-closing state, when the telescopic mechanism 50 extends the telescopic rod 51 to push the transmission rod 43, the extension of the telescopic rod 51 is biased and close to the crank rod 40. Therefore, the transmission rod 43 will push the crank rod 40, so that the crank rod 40 rotates clockwise with its own hinge position as the fixed point, driving the driving rod 41 and the mold clamping base 20 to deflect. At the same time, the mold clamping base 20 drives the driven rod 30 to rotate clockwise with its own hinge position as the fixed point, so that the driven rod 30 and the crank rod 40 produce synchronous movements to ensure the stable deflection movement of the mold clamping base 20 and realize the mold separation of the fixed mold 11 and the movable mold 21.

[0050] like Figure 4As shown, when the fixed mold 11 and the movable mold 21 are in the mold-opening state, and the telescopic mechanism 50 pulls the transmission rod 43 through the telescopic rod 51, the telescopic rod 51 moves away from the crank rod member 40. By pulling the crank rod member 40 through the transmission rod 43, the crank rod member 40 rotates counterclockwise with its own hinged position as the fixed point, driving the driving position rod 41 and the mold clamping seat 20 to deflect. At the same time, the mold clamping seat 20 drives the driven rod member 30 to rotate counterclockwise with its own hinged position as the fixed point, causing the driven rod member 30 and the crank rod member 40 to perform synchronous actions to ensure the stable deflection movement of the mold clamping seat 20 and realize the mold clamping of the fixed mold 11 and the movable mold 21.

[0051] As Figure 3 、 Figure 5 shown, during the assembly of the bending machine, during the mold clamping test of the fixed mold 11 and the movable mold 21, it is found that the fixed mold 11 and the movable mold 21 cannot be accurately mold clamped, and there is a situation of high and low misalignment in the round holes formed after mold clamping. Then, the first threaded shaft 32 and the second threaded shaft 42 are toggled to adjust the distance between the driven rod member 30 and the driven position rod 31, and the distance between the driving position rod 41 and the crank rod member 40, so as to realize the adjustment of the height of the mold clamping seat 20 and its horizontal plane, and solve the problem of high and low misalignment in the round holes formed after mold clamping.

[0052] The advantages of the present invention are that through the coordinated movement of the driven rod member 30, the crank rod member 40 and the transmission rod 43, the linear motion of the telescopic mechanism 50 on the mold clamping seat 20 is converted into the rotational motion of the mold clamping seat 20. On this basis, the driven rod member 30 is equipped with a separable driven position rod 31, and the driven position rod 31 and the driven rod member 30 are threadedly connected through the first threaded shaft 32; while the crank rod member 40 is equipped with a separable driving position rod 41, and the crank rod member 40 and the driving position rod 41 are threadedly connected through the second threaded shaft 42. Thus, by toggling the first threaded shaft 32 and the second threaded shaft 42, the height of the mold clamping seat 20 and its horizontal plane can be adjusted, and the problem that the fixed mold 11 and the movable mold 21 cannot be accurately mold clamped during the assembly process can be solved.

[0053] It should be noted that in the prior art, if the length of the processed rod member or the connection position of the rod members (the rod members can be understood as the above-mentioned driven rod member 30 and crank rod member 40) is different from the designed parameters, it usually affects the height and horizontal plane of the mold clamping seat 20, thus affecting the accurate mold clamping. And by adjusting the rod member length and making up for the problems of inaccurate rod member length and inaccurate connection position.

[0054] Specifically, the telescopic mechanism 50 is a cylinder or an electric cylinder or a hydraulic cylinder.

[0055] Specifically, as Figure 1As shown, a gear shaft connected to the motor is arranged in the driving box 10, and the fixed mold 11 and the swing arm 12 coaxially fixed on the gear shaft are driven by the motor (not shown) to rotate. Since the structure is based on the existing pipe bending machine and has not been improved, it will not be described and explained in detail.

[0056] More specifically, if Figure 1 , Figure 2 As shown, the mating surfaces of the fixed mold 11 and the movable mold 21 are provided with a semicircular groove. After the fixed mold 11 and the movable mold 21 are mated, the semicircular groove of the fixed mold 11 and the semicircular groove of the movable mold 21 form a complete circular structure.

[0057] Specifically, Figure 2 As shown, a sliding seat 22 slidably mounted on the mold clamping seat 20 and a fixed seat 23 fixedly mounted on the mold clamping seat 20 retain a gap, and the movable mold 21 is fixed on the sliding seat 22. A bolt 24 is provided between the sliding seat 22 and the fixed seat 23. By tightening the bolt 24, the distance between the sliding seat 22 and the fixed seat 23 is adjusted.

[0058] like Figure 3 As shown, when the driven rod 30 is vertical, it means that the basic mold base 20 is at the highest height. At this time, it is necessary to ensure that the fixed mold 11 and the movable mold 21 are accurately molded. If there is a deviation between the fixed mold 11 and the movable mold 21, refer to the above-mentioned method of moving the first threaded shaft 32 and the second threaded shaft 42 for adjustment. If there is a gap between the fixed mold 11 and the movable mold 21, the bolt 24 is screwed to push the sliding seat 22 and the movable mold 21 to move together, so that the movable mold 21 and the fixed mold 11 are closed, so as to ensure the precision of the mold closing between the fixed mold 11 and the movable mold 21 during assembly.

[0059] Specifically, Figure 5 As shown, the opposite surfaces of the driven position rod 31 and the driven rod 30 are provided with a first internal thread groove connected to the first threaded shaft 32, and open grooves are provided on both sides of the first internal thread groove so that the side ends of the first threaded shaft 32 are exposed outside the driven position rod 31 and the driven rod 30, so as to better move the first threaded shaft 32.

[0060] The opposite surfaces of the driving rod 41 and the crank rod 40 are provided with a second internal thread groove connected to the second threaded shaft 42, and open grooves are provided on both sides of the second internal thread groove to expose the side ends of the second threaded shaft 42 outside the driving rod 41 and the crank rod 40, so as to better move the second threaded shaft 42.

[0061] More specifically, the combination structure of the driven rod 31, the driven rod 30 and the first threaded shaft 32, and the combination structure of the driving rod 41, the crank rod 40 and the second threaded shaft 42 are distributed on both sides of the mold base 20. In this way, the mold base 20 can be supported more stably. Example 2

[0062] A pipe bender, such as Figure 6 shown, the pipe bender has the link-driven clamping die mechanism in the above-mentioned Embodiment 1.

[0063] Specifically, as Figure 6 shown, an additional plate 60 is fixed to the outer side surface of the swing arm 12 of the pipe bender. A guide rail 61 is provided on the additional plate 60. A guide seat 62 disposed on the guide rail 61 is provided with a power-connected cutting saw blade 64 and a motor 65. The lower end of the cutting saw blade 64 is received between the die holder 20 of the pipe bender and the additional plate 60.

[0064] A driving cylinder 63 fixed to the end of the guide rail 61 is connected to the guide seat 62. The driving cylinder 63 pushes the guide seat 62 to linearly move along the guide rail 61. The cutting saw blade 64 driven by the motor 65 on the guide seat 62 cuts the pipe material that extends out of the fixed die 11 of the pipe bender and has been bent.

[0065] After the pipe bender bends the straight pipe material, it is necessary to cut the bent pipe material. In the present invention, a cutting saw blade 64 capable of linear movement is provided on the swing arm 12, and the cutting saw blade 64 is received between the die holder 20 of the pipe bender and the additional plate 60. Thus, the bent pipe material can be cut in time.

[0066] In the present invention, the motor 65 and the cutting saw blade 64 are fixedly arranged on the guide seat 62 laying the guide rail 61, which is beneficial to the stability of the cutting state.

[0067] The cutting saw blade 64 of the present invention is received between the die holder 20 of the pipe bender and the additional plate 60 (which can be understood as above the outer contour surface of the swing arm 12), close to the part where the fixed die 11 and the movable die 21 clamp the pipe material, which is further beneficial to the stability of the cutting state.

[0068] More specifically, the guide seat 62 is higher than the die holder 20.

[0069] More specifically, a threaded hole is provided on the outer side surface of the swing arm 12, and the additional plate 60 is connected to the threaded hole by a screw to fix the additional plate 60 on the outer side surface of the swing arm 12.

[0070] Although the above describes the illustrative specific embodiments of the present invention for the technical personnel in the technical field to understand the present invention, the present invention is not limited to the scope of the specific embodiments. For the ordinary technical personnel in the technical field, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, all inventions and creations using the concept of the present invention are within the scope of protection.

Claims

1. A connecting rod driven mold clamping mechanism, comprising: a driving box equipped with a fixed mold and a swing arm, and a mold clamping seat accommodated in an open groove of the swing arm, a movable mold mounted on the mold clamping seat and the mold clamping seat move synchronously to achieve mold clamping or mold separation with the fixed mold; It is characterized in that The inner wall of the swing arm open groove is hinged to the driven rod and the crank rod, the driven position rod on the driven rod is hinged to the mold clamping seat, the driven position rod and the driven rod are threadedly connected to a first threaded shaft, and the first threaded shaft is moved to adjust the distance between the driven rod and the driven position rod; The driving rod on the crank rod is hinged to the mold clamping seat, and a second threaded shaft is threadedly connected between the driving rod and the crank rod. The second threaded shaft is moved to adjust the distance between the driving rod and the crank rod. The transmission rod hinged on the crank rod side is hinged to the telescopic rod of the telescopic mechanism fixed in the open groove of the swing arm. The crank rod and the driven rod push or pull the transmission rod through the telescopic mechanism to achieve synchronous action, so as to drive the mold base to shift, and then drive the movable mold and the fixed mold to separate or close the mold.

2. The link drive type clamping die mechanism according to claim 1, wherein, The telescopic mechanism is a pneumatic cylinder, an electric cylinder or a hydraulic cylinder.

3. The link drive type clamping die mechanism according to claim 1, wherein, A gear shaft connected to the motor is arranged in the driving box, and the fixed mold and the swing arm coaxially fixed on the gear shaft are driven by the motor to rotate.

4. The link drive type clamping die mechanism according to claim 3, characterized in that, The mating surfaces of the fixed mold and the movable mold are provided with semicircular grooves. After the fixed mold and the movable mold are mated, the semicircular grooves of the fixed mold and the semicircular grooves of the movable mold form a complete circular structure.

5. The link drive type clamping die mechanism according to claim 1, wherein, A sliding seat slidably mounted on the mold clamping seat and a fixed seat fixedly mounted on the mold clamping seat retain a gap, the movable mold is fixed on the sliding seat, a bolt is arranged between the sliding seat and the fixed seat, and the distance between the sliding seat and the fixed seat is adjusted by tightening the bolt.

6. The link drive type clamping die mechanism according to claim 1, wherein, The surfaces opposite to the driven rod and the driven rod are provided with a first internal thread groove connected to the first threaded shaft, and open grooves are provided on both sides of the first internal thread groove so that the side ends of the first threaded shaft are exposed outside the driven rod and the driven rod; The opposite surfaces of the driving rod and the crank rod are provided with a second internal thread groove connected to the second threaded shaft, and open grooves are provided on both sides of the second internal thread groove to expose the side ends of the second threaded shaft outside the driving rod and the crank rod.

7. A pipe bender, characterized in that, The pipe bending machine has a connecting rod driven clamping mechanism according to any one of claims 1 to 6.

8. The pipe bender according to claim 7, characterized in that, An additional plate is fixed on the outer side of the swing arm of the pipe bender, and a guide rail is provided on the additional plate. A power connection cutting saw blade and a motor are provided on a guide seat arranged on the guide rail, and the lower end of the cutting saw blade is accommodated between the clamping seat of the pipe bender and the additional plate; The driving cylinder fixed at the rear end of the guide rail is connected to the guide seat, and the driving cylinder pushes the guide seat to move linearly along the guide rail, and the cutting saw blade driven to rotate by the motor on the guide seat cuts off the pipe extending out of the fixed mold of the pipe bender and being bent.

9. The pipe bender according to claim 8, wherein, The guide seat is higher than the mold clamping seat.

10. The pipe bender according to claim 8, characterized in that, The outer side surface of the swing arm is provided with threaded holes, and the additional plate is connected to the threaded holes by screws to fix the additional plate on the outer side surface of the swing arm.

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