Connecting rod driving type die clamping mechanism and pipe bending machine

Abstract

The invention discloses a connecting rod driving type die clamping mechanism and a pipe bending machine, and relates to the technical field of pipe bending machines, the connecting rod driving type die clamping mechanism comprises a driving box provided with a fixed die and a swing arm, and a die closing seat accommodated in an open groove of the swing arm, and a movable die assembled on the die closing seat moves synchronously with the die closing seat to realize die closing or die splitting with the fixed die. The linear motion of the telescopic mechanism on the mold closing seat is converted into the rotary motion of the mold closing seat through the cooperative motion of the driven rod piece, the crank rod piece and the transmission rod, on the basis, the driven rod piece is provided with a separable driven position rod, and the driven position rod is in threaded connection with the driven rod piece through a first threaded shaft; the crank rod piece is provided with a separable driving position rod, and the crank rod piece is in threaded connection with the driving position rod through a second threaded shaft, so that the height and the horizontal plane of the mold closing seat can be adjusted by shifting the first threaded shaft and the second threaded shaft, and the problem that the fixed mold and the movable mold cannot be accurately closed in the assembly process is solved.

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] In order to achieve the second of the above-mentioned purposes, the present invention adopts the following technical solution: a pipe bending machine, wherein the pipe bending machine has the connecting rod driven clamping mechanism described in one of the above-mentioned invention purposes.

[0024] Furthermore, in an embodiment of the present invention, an additional plate is fixed on the outer side of the swing arm of the pipe bending machine, 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 mold base of the pipe bending machine and the additional plate.

[0025] 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.

[0026] Furthermore, in an embodiment of the present invention, the guide seat is higher than the mold clamping seat.

[0027] Furthermore, in an embodiment of the present invention, a threaded hole is provided on the outer side surface of the swing arm, and the additional plate is connected to the threaded hole by a screw to fix the additional plate to the outer side surface of the swing arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional schematic diagram of a pipe bending machine according to an embodiment of the present invention.

[0029] Figure 2 It is a schematic diagram of mold separation after the pipe bending machine according to an embodiment of the present invention performs a pipe bending movement.

[0030] Figure 3 Schematic diagram of the mold closing of the connecting rod driven mold clamping mechanism according to an embodiment of the present invention.

[0031] Figure 4 Schematic diagram of mold separation of the connecting rod driven mold clamping mechanism according to an embodiment of the present invention.

[0032] Figure 5 It is a three-dimensional schematic diagram of a driven rod according to an embodiment of the present invention.

[0033] Figure 6 It is a three-dimensional schematic diagram of a pipe bending machine equipped with a cutting saw blade according to an embodiment of the present invention.

[0034] 10. driving box, 11. fixed mold, 12. swing arm; 20. mold clamping seat, 21. movable mold, 22. sliding seat, 23. fixed seat, 24. bolts; 30. driven rod, 31. driven position rod, 32. first threaded shaft; 40. crank rod, 41. driving rod, 42. second threaded shaft, 43. transmission rod; 50. telescopic mechanism, 51. telescopic rod; 60. Additional plate, 61. Guide rail, 62. Guide seat, 63. Driving cylinder, 64. Cutting saw blade, 65. Motor. DETAILED DESCRIPTION

[0035] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail 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, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "one", "first", "second", "third", "fourth", "fifth", "sixth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] For the purpose of simplicity and illustration, the principles of the embodiments are described primarily by reference to examples. In the following description, many specific details are presented 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, structures known to be applied to pipe bending machines are not described in detail to avoid making these embodiments unnecessarily difficult to understand. In addition, all embodiments may be used in combination with each other. Example 1

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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 .

[0043] 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.

[0044] 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.

[0045] like Figure 4As shown, when the fixed mold 11 and the movable mold 21 are in the mold separation state, when the telescopic mechanism 50 pulls the transmission rod 43 through the telescopic rod 51, the telescopic rod 51 moves away from the crank rod 40, and the transmission rod 43 pulls the crank rod 40 to rotate counterclockwise 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 counterclockwise 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 clamping of the fixed mold 11 and the movable mold 21.

[0046] like Figure 3 , Figure 5 As shown, during the assembly of the pipe bending machine, the mold test of the fixed mold 11 and the movable mold 21 found that the fixed mold 11 and the movable mold 21 cannot be accurately molded, and the circular hole formed after the mold is molded is misaligned in height. Then, the first threaded shaft 32 and the second threaded shaft 42 are moved to adjust the distance between the driven rod 30 and the driven position rod 31, and the distance between the driving position rod 41 and the crank rod 40, so as to adjust the height of the mold base 20 and its horizontal plane to solve the problem of height misalignment of the circular hole formed after the mold is molded.

[0047] The advantage of the present invention is that, through the coordinated movement of the driven rod 30, the crank rod 40 and the transmission rod 43, the linear movement of the clamping seat 20 by the telescopic mechanism 50 is converted into the rotational movement of the clamping seat 20. On this basis, the driven rod 30 is equipped with a detachable driven position rod 31, and the driven position rod 31 and the driven rod 30 are threadedly connected through a first threaded shaft 32; and the crank rod 40 is equipped with a detachable driving position rod 41, and the crank rod 40 and the driving position rod 41 are threadedly connected through a second threaded shaft 42. In this way, by moving the first threaded shaft 32 and the second threaded shaft 42, the height and the horizontal plane of the clamping seat 20 can be adjusted, thereby solving the problem that the fixed mold 11 and the movable mold 21 cannot be accurately clamped during the assembly process.

[0048] 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 30 and crank rod 40) is different from the designed parameters, which usually affects the height and horizontal plane of the mold clamping base 20, thereby affecting the precise mold clamping. The problem of inaccurate rod length and inaccurate connection position can be compensated by adjusting the rod length.

[0049] Specifically, the telescopic mechanism 50 is a pneumatic cylinder, an electric cylinder, or a hydraulic cylinder.

[0050] Specifically, 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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

[0057] A pipe bending machine, such as Figure 6 As shown, the pipe bending machine has the connecting rod driven clamping mechanism in the above-mentioned embodiment 1.

[0058] Specifically, Figure 6 As shown, an additional plate 60 is fixed on the outer side of the swing arm 12 of the pipe bending machine, and a guide rail 61 is provided on the additional plate 60. A power connection cutting saw blade 64 and a motor 65 are provided on a guide seat 62 arranged on the guide rail 61. The lower end of the cutting saw blade 64 is accommodated between the mold base 20 of the pipe bending machine and the additional plate 60.

[0059] The driving cylinder 63 fixed at the rear end of the guide rail 61 is connected to the guide seat 62. The driving cylinder 63 pushes the guide seat 62 to move linearly along the guide rail 61, and the cutting saw blade 64 driven to rotate by the motor 65 on the guide seat 62 cuts off the pipe extending out of the fixed mold 11 of the pipe bending machine and being bent.

[0060] After the pipe bender bends the straight pipe, the bent pipe needs to be cut. The present invention provides a linearly movable cutting saw blade 64 on the swing arm 12, and the cutting saw blade 64 is accommodated between the clamping base 20 and the additional plate 60 of the pipe bender. In this way, the bent pipe can be cut in time.

[0061] The present invention fixes the motor 65 and the cutting saw blade 64 on the guide seat 62 of the paving guide rail 61, which is beneficial to the stability of the cutting state.

[0062] The cutting saw blade 64 of the present invention is accommodated between the clamping seat 20 and the additional plate 60 of the pipe bending machine (which can be understood as above the outer contour surface of the swing arm 12), close to the part where the fixed mold 11 and the movable mold 21 clamp the pipe, which is further conducive to the stability of the cutting state.

[0063] More specifically, the guide seat 62 is higher than the clamping seat 20 .

[0064] More specifically, a threaded hole is opened on the outer side of the swing arm 12 , and the additional plate 60 is connected to the threaded hole by screws to fix the additional plate 60 on the outer side of the swing arm 12 .

[0065] Although the above describes the illustrative specific embodiments of the present invention so that those skilled in the art can understand the present invention, the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, all inventions and creations using the concepts of the present invention are protected.

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 connecting rod driven clamping mechanism according to claim 1, characterized in that: The telescopic mechanism is a pneumatic cylinder, an electric cylinder or a hydraulic cylinder.

3. The connecting rod driven clamping mechanism according to claim 1, characterized in that: 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 connecting rod driven clamping 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 connecting rod driven mold clamping mechanism according to claim 1, characterized in that: 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 connecting rod driven mold clamping mechanism according to claim 1, characterized in that: 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 bending machine, 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 bending machine 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 bending machine according to claim 8, characterized in that: The guide seat is higher than the mold clamping seat.

10. The pipe bending machine according to claim 8, characterized in that: A threaded hole is provided on the outer side of the swing arm, and the additional plate is connected to the threaded hole by means of screws so as to fix the additional plate on the outer side of the swing arm.

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