outside clamp holding mechanism

Abstract

The utility model relates to outside formula clamping mechanism, including first clamping arm, with first clamping arm rotatory connection's second clamping arm and operating mechanism, the clamping block of first clamping arm is opposite with the clamping block of second clamping arm and sets up, operating mechanism includes connecting rod and handle, one end of handle has first position and second position, and one end of connecting rod is movably connected with first clamping arm, and the other end of connecting rod is movably connected with the first position of handle, the second position of handle is movably connected with the middle part of second clamping arm, through push and pull handle can drive second clamping arm positive and negative rotation, realize the clamping block of second clamping arm and the clamping block of first clamping arm switch between clamping and opening. The present application can realize fixed diameter clamping, and through operating handle can be switched between clamping and loosening fast, and the operation is simple, the present application can be applicable to different sizes of the clamped piece through adjusting the length of connecting rod, the angle of the clamping group of the present application is adjustable, and different parts of bicycle frame can be clamped flexibly, and the adaptability is strong.

Description

Technical Field

[0001] This utility model relates to the field of clamping mechanism technology, and in particular to an external clamping mechanism. Background Technology

[0002] Bicycles are a traditional means of transportation. Bicycles are divided into electric bicycles and regular bicycles. Regular bicycles are powered by pedaling and can be further classified into recreational bicycles, mountain bicycles, road bicycles, etc., according to their specific application environment and frame structure.

[0003] The frame is the basic structural component of a bicycle, and other parts are usually mounted directly or indirectly to it. The standard practice for bicycle assembly is to use assembly jigs to hold the frame in place before installing other components. As the component that directly clamps the frame, the ease of operation of the clamping mechanism directly impacts the user experience. Utility Model Content

[0004] This utility model provides an external clamping mechanism to solve the above-mentioned technical problems.

[0005] This utility model is achieved through the following technical solution: The external clamping mechanism provided in this application includes a first clamping arm with a clamping block at one end, a second clamping arm with a clamping block at the other end and a clamping block at the rotatable end of one end of the first clamping arm, and an operating mechanism. The clamping blocks of the first clamping arm and the clamping blocks of the second clamping arm are arranged opposite to each other. The operating mechanism includes a connecting rod and a handle. One end of the handle has a first position and a second position. One end of the connecting rod is movably connected to the first clamping arm, and the other end of the connecting rod is movably connected to the first position of the handle. The second position of the handle is movably connected to the middle of the second clamping arm. By pushing and pulling the handle, the second clamping arm can be rotated in both directions, thereby switching between clamping and opening between the clamping blocks of the second clamping arm and the clamping blocks of the first clamping arm.

[0006] Optionally, the second clamping arm is rotatably connected to the first clamping arm via a first shaft, the handle is rotatably connected to the second clamping arm via a second shaft, and one end of the connecting rod is rotatably connected to the first clamping arm via a third shaft.

[0007] Preferably, one of the first clamping arm and the handle has a limiting groove, and the other has a limiting protrusion that matches the limiting groove. When clamping is required, pushing the handle causes the clamping block of the second clamping arm to come close to the clamping block of the first clamping arm and clamp it, and the limiting protrusion is engaged in the limiting groove to achieve self-locking. When releasing is required, pulling back the handle causes the limiting protrusion to exit from the limiting groove to achieve unlocking.

[0008] Optionally, the first clamping arm includes a first plate and a second plate, which are arranged at intervals; there are two second clamping arms, which are connected to the same clamping block; the two second clamping arms are rotatably connected to one of the first plate and the second plate respectively via a first shaft; or the two second clamping arms are rotatably connected to the first plate and the second plate via a first shaft; one end of the handle is separated to form two connecting arms, which are rotatably connected to one of the two second clamping arms respectively via a second shaft; or the two connecting arms are rotatably connected to the two second clamping arms via a second shaft.

[0009] Optionally, a support member is installed at the first position of the handle, with both ends of the support member rotatably connected to one of the connecting arms, and a second hole adapted to the connecting rod on the support member, with one end of the connecting rod installed in the second hole; or, both ends of the support member are connected to one of the connecting arms, and one end of the connecting rod is rotatably connected to the support member.

[0010] Optionally, the edges of the first plate and the second plate are each equipped with a limiting groove, and the edges of the two connecting arms are equipped with limiting protrusions. The limiting grooves of the first plate and the second plate are respectively adapted to the limiting protrusions of one of the connecting arms; or, the edges of the first plate and the second plate are each equipped with a limiting protrusion, and the edges of the two connecting arms are equipped with a limiting groove. The limiting protrusions of the first plate and the second plate are respectively adapted to the limiting grooves of one of the connecting arms.

[0011] Optionally, the connecting rod includes an adjusting bolt, an adjusting nut, and a connecting rod. One end of the adjusting bolt is rotatably connected to the first clamping arm via a third shaft, the other end of the adjusting bolt is threadedly connected to one end of the adjusting nut, the other end of the adjusting nut is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is connected to the handle.

[0012] Optionally, the adjusting nut is a fully threaded nut, with the other end of the adjusting nut threadedly connected to one end of the connecting rod, and the other end of the connecting rod installed in the second hole of the support on the handle.

[0013] Optionally, the external clamping mechanism further includes a fixed plate, a locking knob, and a locking shaft. One end of the fixed plate has a shaft hole, and one end of the locking shaft is installed in the shaft hole and has a clearance fit with the shaft hole. The other end of the locking shaft is connected to the end of the first clamping arm away from the clamping block. The outer wall of the fixed plate has a threaded hole that matches the locking knob. The inner end of the threaded hole perpendicularly passes through the shaft hole, and the threaded end of the locking knob is installed in the threaded hole. The locking shaft has multiple locking holes that match the inner end of the locking knob at equal intervals along its circumference. By rotating the locking knob in both directions, its inner end can be inserted into or removed from the locking holes of the locking shaft.

[0014] Optionally, the clamping block has a first clamping surface and a second clamping surface, with the first clamping surface and the second clamping surface arranged at an angle.

[0015] Compared with the prior art, this application has at least the following beneficial effects: 1. This application can achieve sizing clamping, and can quickly switch between clamping and releasing by operating the handle, which is simple to operate; 2. This application can be adapted to clamped parts of different sizes by adjusting the length of the connecting rod; 3. The angle of the clamping component in this application is adjustable, which can flexibly clamp different parts of the bicycle frame and has strong adaptability.

[0016] Of course, implementing any of the solutions of this utility model does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of the external clamping mechanism in the clamping state during the embodiment. Figure 2 This is a perspective view of the external clamping mechanism when the operating mechanism is not shown in the embodiment; Figure 3 This is a perspective view of the first clamping arm in the embodiment; Figure 4 This is a perspective view of the handle in the embodiment; Figure 5 This is a top view of the external clamping mechanism in the embodiment, where (a) is a schematic diagram when clamped; and (b) is a schematic diagram when opened to the maximum extent. Figure 6 This is a diagram showing the change in the external clamping mechanism from clamping to opening in the embodiment. The solid line represents the schematic diagram of the opening state, and the dashed line represents the schematic diagram of the position of the second clamping arm and the operating mechanism in the clamping state. Figure 7 This is a cross-sectional view of the external clamping mechanism when the connecting rod length is adjustable in the embodiment. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] It should be noted that, where there is no conflict, the embodiments and features described in this utility model can be combined with each other. It should also be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0021] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Please see Figure 1 This embodiment discloses an external clamping mechanism, including a clamping assembly. The clamping assembly includes a first clamping arm 1, a second clamping arm 2, and an operating mechanism. One end of the first clamping arm 1 is a clamping end, and one end of the second clamping arm 2 is movably connected to the first clamping arm 1. The other end of the second clamping arm 2 is also a clamping end. The clamping ends of the first clamping arm 1 and the second clamping arm 2 are arranged opposite to each other. A clamping block 3 is installed on both the clamping ends of the first clamping arm 1 and the second clamping arm 2. The two clamping blocks 3 are arranged opposite to each other and work together to achieve the clamping function.

[0024] The operating mechanism is used to drive the clamping block 3 of the second clamping arm 2 to approach and clamp with the clamping block 3 of the first clamping arm 1, and to separate and open. For details, please refer to... Figure 1 The operating mechanism includes a connecting rod 4 and a handle 5. One end of the handle 5 is a stem, and the other end has a first position and a second position. One end of the connecting rod 4 is movably connected to the first clamping arm 1, and the other end of the connecting rod 4 is movably connected to the first position of the handle 5. The second position of the handle 5 is movably connected to the second clamping arm 2. For ease of gripping, the stem is provided with a handle sleeve 53. Please refer to [link / reference]. Figure 5 , Figure 6By pushing or pulling the handle 5, the second clamping arm 2 can be rotated in both directions, so that the clamping block 3 of the second clamping arm 2 and the clamping block 3 of the first clamping arm 1 can switch between clamping and opening. The operation is very simple.

[0025] Please see Figure 3 , Figure 4 , Figure 5 In some embodiments, the first clamping arm 1 has a limiting groove 10, and the handle 5 has a limiting protrusion 50 that is adapted to the limiting groove 10. When clamping is required, the handle 5 is pushed to make the clamping block 3 of the second clamping arm 2 approach and clamp with the clamping block 3 of the first clamping arm 1, and the limiting protrusion 50 is inserted into the limiting groove 10 to achieve self-locking. When it is necessary to release, the handle 5 is pulled back to make the limiting protrusion 50 exit from the limiting groove 10 to achieve unlocking, and the clamping block 3 of the second clamping arm 2 separates from the clamping block 3 of the first clamping arm 1 and opens.

[0026] In other embodiments, the first clamping arm 1 has a limiting protrusion 50, and the handle 5 has a limiting groove 10 that is adapted to the limiting protrusion 50. When the clamping assembly clamps the clamped part, the limiting protrusion 50 is engaged in the limiting groove 10 to achieve self-locking.

[0027] Please see Figure 1 In an exemplary embodiment, the second clamping arm 2 is rotatably connected to the first clamping arm 1 via a first shaft 61, the handle 5 is rotatably connected to the second clamping arm 2 via a second shaft 62, and one end of the connecting rod 4 is rotatably connected to the first clamping arm 1 via a third shaft 63. The first shaft 61, the second shaft 62, and the third shaft 63 are parallel to each other. The limiting groove 10 is located between the first shaft 61 and the third shaft 63.

[0028] To reduce the weight of the external clamping mechanism, both the first clamping arm 1 and the second clamping arm 2 are plate-shaped structures. Please refer to [link / reference]. Figure 2 , Figure 3 In an exemplary embodiment, the first clamping arm 1 includes a first plate 11, a second plate 12, and a third plate 13. The first plate 11 and the second plate 12 are arranged parallel to each other and spaced apart. The two sides of the third plate 13 are respectively connected to the first plate 11 and the second plate 12. The second clamping arm 2 is flat and there are two second clamping arms 2. The two second clamping arms 2 are rotatably connected to one of the first plate 11 and the second plate 12, and the two second clamping arms 2 are connected to the same clamping block 3. In an exemplary embodiment, there are limiting grooves 10 on the edges of the first plate 11 and the second plate 12. Correspondingly, there are two limiting protrusions 50 on the handle 5, and the two limiting protrusions 50 are respectively connected to one of the limiting grooves 10.

[0029] In some embodiments, to facilitate the connection of the clamping assembly with other components, the first clamping arm 1 further includes a fourth plate 14. One end of the first plate 11, the second plate 12 and the third plate 13 are connected to the clamping block 3, and the other end of the first plate 11, the second plate 12 and the third plate 13 are all connected to the fourth plate 14. The fourth plate 14 has connection holes.

[0030] In an exemplary embodiment, the two ends of the first shaft 61 are respectively installed in the first shaft holes 15 of the first plate 11 and the second plate 12, and one end of each of the two second clamping arms 2 is opened and connected to the first shaft 61; the two ends of the second shaft 62 are respectively installed in the second shaft holes in the middle of the two second clamping arms 2; the two ends of the third shaft 63 are respectively installed in the third shaft holes 16 of the first plate 11 and the second plate 12. The limiting groove 10 is located in the area between the first shaft hole 15 and the third shaft hole 16. In other embodiments, the two second clamping arms 2 are rotatably connected to one of the first plate 11 and the second plate 12 via a first shaft 61.

[0031] Preferably, the first plate 11, the second plate 12, the third plate 13 and the fourth plate 14 are manufactured as a single piece.

[0032] Please see Figure 4 In some embodiments, one end of the handle 5 is split to form two connecting arms 51, both of which are movably connected to the second clamping arm 2. The edges of the two connecting arms 51 have limiting protrusions 50, which are respectively adapted to the limiting grooves 10 of the first plate 11 and the second plate 12. In other embodiments, the edges of both the first plate 11 and the second plate 12 have limiting protrusions 50, and the edges of the two connecting arms 51 have limiting grooves 10. The limiting protrusions 50 of the first plate 11 and the second plate 12 are respectively adapted to the limiting groove 10 of one of the connecting arms 51.

[0033] In some embodiments, the two connecting arms 51 are rotatably connected to one of the two second clamping arms 2 via a second shaft 62; or both ends of the second shaft 62 are respectively installed in the shaft holes of the two second clamping arms 2, and one end of each connecting arm 51 is opened and connected to the second shaft 62. In an exemplary embodiment, each of the two connecting arms 51 is provided with a first hole 52 adapted to the second shaft 62, and the second shaft 62 is installed in the first hole 52 of the two connecting arms 51. Based on this, in some embodiments, the connecting rod 4 is movably connected to the handle 5 at a first position via a support member 65. Both ends of the support member 65 are rotatably connected to one of the connecting arms 51, and the support member 65 has a second hole 66 adapted to the connecting rod 4, and one end of the connecting rod 4 is installed in the second hole 66. In an exemplary embodiment, both ends of the support member 65 are rotatably connected to one of the connecting arms 51 via a fourth shaft 64; the fourth shaft 64 is installed in the shaft hole of the connecting arm 51, and one end of it is threadedly connected to the support member 65.

[0034] In other embodiments, both ends of the support member 65 are connected to one of the connecting arms 51, and one end of the connecting rod 4 is rotatably connected to the support member 65, for example, one end of the connecting rod 4 is loosely fitted onto the support member 65. In some embodiments, both connecting arms 51 are plate-shaped.

[0035] There are many ways to separate one end of the handle 5 to form two connecting arms 51, including but not limited to the following: Method 1: One end of the handle 5 is divided into two; Method 2: The handle 5 includes two plate-shaped pieces, which are arranged symmetrically. One end of the two plate-shaped pieces overlaps to form the handle, and the other end of the two plate-shaped pieces is separated by a certain distance to form two connecting arms 51, so that the handle 5 as a whole has a Y-shaped structure.

[0036] In the above embodiment, the handle, connecting rod, and clamping arm form a linkage mechanism. When operated by the handle, the movement trajectory and amplitude of the second clamping arm are fixed, enabling sizing clamping. Furthermore, during use, simply pushing the handle all the way down achieves the clamping state; to release, simply pull the handle back slightly. Figure 5 , Figure 6 As shown.

[0037] Because bicycles come in different models, each model has a different frame outer diameter. Please refer to [link / reference needed] for information on different bicycle models. Figure 7 In some embodiments, the length of the connecting rod 4 is adjustable. By adjusting the length of the connecting rod 4, the angle between the first clamping arm 1 and the second clamping arm 2 in the clamping state can be adjusted, thereby adapting to clamped parts of different sizes.

[0038] Optionally, the connecting rod 4 includes an adjusting bolt 41 and an adjusting nut 42. One end of the adjusting bolt 41 is installed inside the adjusting nut 42. By rotating the adjusting nut 42, the depth to which the adjusting bolt 41 is inserted into the adjusting nut 42 is adjusted to change the length of the connecting rod 4.

[0039] Please see Figure 7 In an exemplary embodiment, the connecting rod 4 includes an adjusting bolt 41, an adjusting nut 42, and a connecting rod 43. One end of the adjusting bolt 41 is connected to the third shaft 63, and the other end of the adjusting bolt 41 is threadedly connected to one end of the adjusting nut 42. The other end of the adjusting nut 42 is rotatably connected to one end of the connecting rod 43, and the other end of the connecting rod 43 is connected to the handle 5. Specifically, the other end of the connecting rod 43 is mounted in the second hole 66 of the support member 65 on the handle 5.

[0040] Optionally, the adjusting nut 42 is a fully threaded nut, and the other end of the adjusting nut 42 is threadedly connected to the connecting rod 43.

[0041] When using it, adjust the length of the connecting rod 4 according to the size of the clamped part. After the production of the same model of clamped part is completed, adjust the length of the connecting rod 4 according to the size of the next batch of clamped parts.

[0042] Because different parts of the bicycle frame have tubes at different angles, the clamping assembly can be adjusted in some embodiments to more flexibly clamp different parts of the bicycle frame. Specifically, the external clamping mechanism also includes a fixing plate 7, a locking knob 8, and a locking shaft 9. One end of the fixing plate 7 has a shaft hole 71, and one end of the locking shaft 9 is installed in the shaft hole 71 with clearance fit. The other end of the locking shaft 9 is connected to the end of the first clamping arm 1 away from the clamping block 3. The outer wall of the fixing plate 7 has a threaded hole adapted to the locking knob 8. The inner end of the threaded hole perpendicularly passes through the shaft hole 71, and the threaded end of the locking knob 8 is installed in the threaded hole. The locking shaft 9 has a plurality of locking holes 91 that are adapted to the inner end of the locking knob 8 at equal intervals along its circumference. By rotating the locking knob 8 in both directions, its inner end can be inserted into or removed from the locking holes 91 of the locking shaft 9. When the inner end of the locking knob 8 is not inserted into the locking hole 91, the clamping assembly can be rotated freely to adjust the angle of the clamping block to adapt to different clamping positions of the frame; when the locking knob 8 is rotated so that its inner end is inserted into a certain locking hole 91, the locking shaft 9 is locked and the clamping assembly can no longer be rotated freely, thus fixing the angle of the clamping assembly.

[0043] In some embodiments, the fourth plate 14 of the first clamping arm 1 is connected to the outer end screw of the locking shaft 9.

[0044] It is worth noting that a connection hole 72 is provided on the fixing plate 7 to facilitate the connection of the external clamping mechanism with other components.

[0045] In some embodiments, the clamping block 3 has a first clamping surface 31 and a second clamping surface 32, which are arranged at an angle. When clamping the workpiece, the first clamping surface 31 and the second clamping surface 32 can respectively contact different parts of the workpiece. It is worth noting that the angle between the first clamping surface 31 and the second clamping surface 32 can be reasonably set as needed.

[0046] This application allows for quick switching between clamping and releasing via the operating handle, making it easy to operate.

[0047] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An external clamping mechanism, characterized in that, include: A first clamping arm (1) with a clamping block (3) at one end; A second clamping arm (2) has one end rotatably connected to the first clamping arm (1) and the other end having a clamping block (3), wherein the clamping block (3) of the first clamping arm (1) and the clamping block (3) of the second clamping arm (2) are arranged opposite to each other; and The operating mechanism includes a connecting rod (4) and a handle (5). One end of the handle (5) has a first position and a second position. One end of the connecting rod (4) is movably connected to the first clamping arm (1), and the other end of the connecting rod (4) is movably connected to the first position of the handle (5). The second position of the handle (5) is movably connected to the middle part of the second clamping arm (2). By pushing and pulling the handle (5), the second clamping arm (2) can be driven to rotate in the forward and reverse directions, so that the clamping block (3) of the second clamping arm (2) and the clamping block (3) of the first clamping arm (1) can switch between clamping and opening.

2. The external clamping mechanism according to claim 1, characterized in that, The second clamping arm (2) is rotatably connected to the first clamping arm (1) via the first shaft (61), the handle (5) is rotatably connected to the second clamping arm (2) via the second shaft (62), and one end of the connecting rod (4) is rotatably connected to the first clamping arm (1) via the third shaft (63).

3. The external clamping mechanism according to claim 1, characterized in that, In the first clamping arm (1) and the handle (5), one has a limiting groove (10), and the other has a limiting protrusion (50) that is adapted to the limiting groove (10). When clamping is required, push the handle (5) to bring the clamping block (3) of the second clamping arm (2) close to the clamping block (3) of the first clamping arm (1) and clamp it, and the limiting protrusion (50) can be inserted into the limiting groove (10) to achieve self-locking; when it is necessary to release, pull back the handle (5) to make the limiting protrusion (50) exit from the limiting groove (10) to achieve unlocking.

4. The external clamping mechanism according to claim 1, 2 or 3, characterized in that, The first clamping arm (1) includes a first plate (11) and a second plate (12), with the first plate (11) and the second plate (12) arranged at intervals; There are two second clamping arms (2), and the two second clamping arms (2) are connected to the same clamping block (3); the two second clamping arms (2) are respectively rotatably connected to one of the first plate (11) and the second plate (12) through the first shaft (61); or the two second clamping arms (2) are rotatably connected to the first plate (11) and the second plate (12) through the first shaft (61); One end of the handle (5) is separated to form two connecting arms (51), and the two connecting arms (51) are rotatably connected to one of the two second clamping arms (2) through the second shaft (62); or the two connecting arms (51) and the two second clamping arms (2) are rotatably connected through the second shaft (62).

5. The external clamping mechanism according to claim 4, characterized in that, A support member (65) is installed at the first position of the handle (5). The two ends of the support member (65) are rotatably connected to one of the connecting arms (51). The support member (65) has a second hole (66) that is adapted to the connecting rod (4). One end of the connecting rod (4) is installed in the second hole (66). Alternatively, the two ends of the support member (65) are connected to one of the connecting arms (51), and one end of the connecting rod (4) is rotatably connected to the support member (65).

6. The external clamping mechanism according to claim 4, characterized in that, There are limiting grooves (10) on the edges of the first plate (11) and the second plate (12), and limiting protrusions (50) on the edges of the two connecting arms (51). The limiting grooves (10) of the first plate (11) and the second plate (12) are respectively adapted to the limiting protrusions (50) of one of the connecting arms (51). Alternatively, there are limiting protrusions (50) on the edges of the first plate (11) and the second plate (12), and limiting grooves (10) on the edges of the two connecting arms (51). The limiting protrusions (50) of the first plate (11) and the second plate (12) are respectively adapted to the limiting grooves (10) of one of the connecting arms (51).

7. The external clamping mechanism according to claim 1, 2, 3, 5 or 6, characterized in that, The connecting rod (4) includes an adjusting bolt (41), an adjusting nut (42), and a connecting rod (43). One end of the adjusting bolt (41) is rotatably connected to the first clamping arm (1) via a third shaft (63). The other end of the adjusting bolt (41) is threadedly connected to one end of the adjusting nut (42). The other end of the adjusting nut (42) is rotatably connected to one end of the connecting rod (43). The other end of the connecting rod (43) is connected to the handle (5).

8. The external clamping mechanism according to claim 7, characterized in that, The adjusting nut (42) is a fully threaded nut. The other end of the adjusting nut (42) is threaded to one end of the connecting rod (43). The other end of the connecting rod (43) is installed in the second hole (66) of the support member (65) on the handle (5).

9. The external clamping mechanism according to claim 1, 2, 3, 5, 6 or 8, characterized in that, It also includes a fixing plate (7), a locking knob (8) and a locking shaft (9). One end of the fixing plate (7) has a shaft hole (71), one end of the locking shaft (9) is installed in the shaft hole (71) and is clearance-fitted with the shaft hole (71), and the other end of the locking shaft (9) is connected to the end of the first clamping arm (1) away from the clamping block (3). The outer wall of the fixing plate (7) has a threaded hole that is compatible with the locking knob (8). The inner end of the threaded hole is perpendicular to the shaft hole (71), and the threaded end of the locking knob (8) is installed in the threaded hole. The locking shaft (9) has multiple locking holes (91) that are adapted to the inner end of the locking knob (8) at equal intervals along its circumference. By rotating the locking knob (8) in the forward and reverse directions, its inner end can be inserted into or removed from the locking hole (91) of the locking shaft (9).

10. The external clamping mechanism according to claim 1, 2, 3, 5, 6 or 8, characterized in that, The clamping block (3) has a first clamping surface (31) and a second clamping surface (32), and the first clamping surface (31) and the second clamping surface (32) are arranged at an angle.

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