Small-section high-strength wrought aluminum type flexible distance-adjusting wire clamp

Abstract

The invention provides a small-section high-strength wrought aluminum type flexible distance-adjusting wire clamp, which solves the problem of buffering of a wire clamp and a cable, and comprises a pull rod, a fixed clamping piece and a movable clamping piece which are axially limited and circumferentially rotated are arranged on the pull rod, and the movable clamping piece is equipped with a ball socket rotating mechanism. Buffering mechanisms are arranged between the fixed clamping piece and the pull rod and between the movable clamping piece and the pull rod. The device has the advantages of good structural stability, buffering and vibration reduction and the like.

Description

Technical Field

[0001] The present invention belongs to the field of electric power auxiliary equipment, and particularly relates to a small-section high-strength forged aluminum flexible distance-adjusting wire clamp. Background Art

[0002] High-voltage cable wire clamps are fittings used to fix and connect high-voltage cables, fixing the high-voltage cables on poles, brackets or other support structures to prevent the cables from moving or shaking due to external forces, ensuring the stability and safety of power transmission. At the same time, they bear the tension of high-voltage cables. Especially in long-distance transmission lines spanning rivers, valleys or other areas, the wire clamps need to have sufficient strength to ensure the safe suspension of the cables. However, in actual use, the existing wire clamps are inconvenient to adjust the distance and cannot relatively fix the positions of cables at different distances. In addition, when affected by external interference, the existing electric power fittings cannot buffer with the cables, and the excessive local shaking amount causes damage to the cables.

[0003] In order to solve the deficiencies of the existing technology, people have carried out long-term explorations and proposed various solutions. For example, a Chinese patent document discloses a forged aluminum alloy suspension wire clamp with an application number of 202021861434.8, which includes an upper hanging rod. The lower part of the upper hanging rod is bolted to a lower hanging rod. Through holes are provided in both the lower part of the upper hanging rod and the upper part of the lower hanging rod. A hanging rod fixing bolt is movably connected between the lower part of the upper hanging rod and the upper part of the lower hanging rod. One end of the hanging rod fixing bolt is movably connected to a hanging rod nut. A wire clamp bracket is bolted to one side of the upper hanging rod. This forged aluminum alloy suspension wire clamp is provided with a cooperation of the upper hanging rod and a locking pin.

[0004] The above solution solves the problem of the flexibility of wire clamp distance adjustment to a certain extent, but there are still many deficiencies in this solution. For example, the problem of buffering between the wire clamp and the cable cannot be achieved. Summary of the Invention

[0005] The purpose of the present invention is to provide a small-section high-strength forged aluminum flexible distance-adjusting wire clamp with reasonable design and good buffering effect for the above problems.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: A small-section high-strength forged aluminum flexible distance-adjusting wire clamp includes a pull rod, on which a fixed clamp and a movable clamp with axial limit and circumferential rotation are installed. The movable clamp is equipped with a ball socket rotation mechanism, and a buffer mechanism is provided between the fixed clamp, the movable clamp and the pull rod.

[0007] In the above-mentioned small-section high-strength forged aluminum flexible distance-adjusting wire clamp, mounting bases corresponding to the fixed clamp and the movable clamp are installed on the pull rod, and a quick-release component is provided between the mounting bases and the fixed clamp and the movable clamp.

[0008] In the above-mentioned small-section high-strength forged aluminum flexible pitch-adjusting wire clamp, the installation base is cylindrical. A number of locking rods arranged centrally symmetrically with respect to the central axis of the installation base are slidably installed inside the installation base. A locking tooth opposite to the locking rod is movably installed on the inner side of the installation base. On the side of the locking tooth opposite to the locking rod, there are mutually fitting locking inclined surfaces. The locking inclined surfaces convert the axial thrust of the locking rod into the radial thrust of the locking tooth. A locking opening for the locking tooth to insert is provided on the pull rod. A locking nut is threadedly installed at the end of the installation base, and the locking nut presses against the locking rod; the quick-release assembly includes quick-release holes provided at the ends of the fixed clamp and the movable clamp for the installation base to insert. A quick-release tooth opposite to the locking rod is movably installed on the outer side of the middle part of the installation base. On the side of the quick-release tooth opposite to the locking rod, there are mutually fitting quick-release inclined surfaces. The quick-release inclined surfaces convert the axial thrust of the locking rod into the radial thrust of the quick-release tooth. A quick-release opening for the quick-release tooth to insert is provided inside the quick-release hole.

[0009] In the above-mentioned small-section high-strength forged aluminum flexible pitch-adjusting wire clamp, the buffer mechanism includes a buffer sleeve provided inside the quick-release hole, and an adaptive damping assembly is provided between the fixed clamp and the movable clamp and the buffer sleeve.

[0010] In the above-mentioned small-section high-strength forged aluminum flexible pitch-adjusting wire clamp, the adaptive damping assembly includes damping cavities provided at the ends of the fixed clamp and the movable clamp. The buffer sleeve is connected with a buffer ring in a circular shape and with a C-shaped cross-section. The outer side of the buffer ring fits against the inner side of the damping cavity. A pair of conical spiral springs are installed between the buffer ring and the buffer sleeve. One end of the conical spiral spring is fixedly connected to the buffer ring and the buffer sleeve, and the other end is fixedly connected to the damping cavity. The spiral directions of the conical spiral springs are opposite.

[0011] In the above-mentioned small-section high-strength forged aluminum flexible pitch-adjusting wire clamp, the fixed clamp and the movable clamp respectively have a main clamp head and a sub-clamp head hinged to the main clamp head. Opposite clamping grooves are provided between the main clamp head and the sub-clamp head. A clamping bolt inserted into the end of the main clamp head is hinged at the end of the sub-clamp head. The clamping bolt is threadedly connected with a clamping nut that fits against and presses the main clamp head.

[0012] In the above-mentioned small-section high-strength forged aluminum flexible pitch-adjusting wire clamp, the ball socket rotation mechanism includes a rotating seat provided in the middle of the movable clamp. Sealing covers are fixed on both sides of the rotating seat through threaded parts. A rotating cavity is left between the rotating seat and the inside of the sealing cover. Rotating openings for the main clamp head to insert are provided at the upper ends of the rotating seat and the sealing cover. The main clamp head of the movable clamp is connected with a rotating ball movably installed in the rotating cavity. A viscous damping assembly is provided between the sealing cover, the rotating seat and the rotating ball.

[0013] In the above-mentioned small-section high-strength forged aluminum flexible pitch-adjusting wire clamp, the viscous damping assembly includes a damping groove provided at the bottom of the rotating seat. The bottom of the damping groove is arc-shaped. The rotating ball has a damping block extending into the damping groove and fitting with its bottom. Damping push bars arranged in central symmetry are installed on the inner side of the damping groove. One end of the damping push bar presses against the damping block and the other end faces a fluid chamber hidden in the rotating seat and the closing cover. The fluid chambers are interconnected through viscous flow channels and filled with a damping medium inside.

[0014] In the above-mentioned small-section high-strength forged aluminum flexible pitch-adjusting wire clamp, pin holes are respectively opened at both ends of the pull rod, and pins opposite to the fixed clamp and the movable clamp are inserted into the pin holes.

[0015] In the above-mentioned small-section high-strength forged aluminum flexible pitch-adjusting wire clamp, the pull rod is made of a casting material, and the fixed clamp and the movable clamp are made of forged aluminum alloy.

[0016] Compared with the existing technology, the advantages of the present invention are as follows: The ball-and-socket rotating mechanism and the buffer mechanism ensure that there is a certain amount of movement margin between the clamp and the pull rod, which can play a role in buffering and vibration reduction when receiving external impacts, and have a good protective effect on the cable; The clamp can flexibly adjust the relative position with the pull rod, and then adjust the relative distance between the fixed clamp and the movable clamp to adapt to the fixation of cables with different spacings; The ball-and-socket rotating mechanism is equipped with a viscous damping assembly, so that when the movable clamp rotates in all directions, the buffer damping can be adjusted in real time according to the impact amplitude. Description of the Drawings

[0017] Figure 1 is a structural schematic diagram of the present invention; Figure 2 is a partial cross-sectional view of the present invention; Figure 3 is a partial sectional view of the present invention; Figure 4 is another partial sectional view of the present invention; Figure 5 is a structural schematic diagram of the main clamp of the present invention; Figure 6 is a structural cross-sectional view of the ball-and-socket rotating mechanism of the present invention; In the figure, there are a pull rod 1, a pin hole 11, a plug pin 12, a fixed clip 2, a main chuck 21, a sub-chuck 22, a clip wire groove 23, a clamping bolt 24, a clamping nut 25, a movable clip 3, a ball socket rotating mechanism 4, a rotating base 41, a closed cover 42, a rotating cavity 43, a rotating port 44, a rotating ball 45, a buffer mechanism 5, a buffer sleeve 51, a damping cavity 52, a buffer ring 53, a conical spiral spring 54, a mounting base 6, a locking rod 61, a locking tooth 62, a locking inclined plane 63, a locking port 64, a locking nut 65, a quick-release hole 66, a quick-release tooth 67, a quick-release inclined plane 68, a quick-release port 69, a viscous damping component 7, a damping groove 71, a damping block 72, a damping push bar 73, a fluid cavity 74, and a viscous flow channel 75. Detailed implementation manners

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0019] As Figures 1-6 shown, a small-section high-strength forged aluminum flexible adjustable-distance wire clamp includes a pull rod 1. An axially limited and circumferentially rotatable fixed clip 2 and a movable clip 3 are installed on the pull rod 1. The fixed clip 2 and the movable clip 3 respectively clamp and fix the cable, and at the same time adjust the relative position with the pull rod 1 to ensure that the cable is not subjected to additional pulling force. Due to the external impact causing the cable to shake, in order to achieve buffering and vibration reduction, the movable clip 3 is equipped with a ball socket rotating mechanism 4. The ball socket rotating mechanism 4 enables the movable clip 3 to have a certain amount of movement relative to the pull rod 1, adapting to impact forces in different directions and cables at different installation positions. A buffer mechanism 5 is provided between the fixed clip 2 and the movable clip 3 and the pull rod 1. The buffer mechanism 5 cooperates with the above-mentioned ball socket rotating mechanism 4 to achieve double vibration reduction and buffering.

[0020] Specifically, mounting bases 6 corresponding to the fixed clip 2 and the movable clip 3 respectively are installed on the pull rod 1. A quick-release assembly is provided between the mounting base 6 and the fixed clip 2 and the movable clip 3. The operator can complete the assembly and separation of the mounting base 6 and the pull rod 1 manually. Multiple fixed clips 2 or movable clips 3 can be assembled on the same pull rod 1 according to the number of cables.

[0021] In depth, the mounting base 6 is cylindrical and its central axis coincides with the pull rod 1. A number of locking rods 61 that are centrally symmetrically arranged relative to the central axis of the mounting base 6 are slidably mounted inside the mounting base 6. A locking tooth 62 opposite to the locking rod 61 is movably mounted on the inner side of the mounting base 6. On the side of the locking tooth 62 opposite to the locking rod 61, there are mutually fitting locking inclined surfaces 63. The locking inclined surfaces 63 convert the axial thrust of the locking rod 61 into the radial thrust of the locking tooth 62. A locking opening 64 for the locking tooth 62 to insert is formed on the pull rod 1. A locking nut 65 is threadedly mounted at the end of the mounting base 6, and the locking nut 65 presses against the locking rod 61. When the mounting base 6 slides along the pull rod 1 to the specified axial position, the locking nut 65 is rotated to push the locking rod 61 to slide. The locking inclined surfaces 63 guide the locking tooth 62 to slide towards the central axis and insert into the locking opening 64 on the pull rod 1, achieving axial and circumferential positioning simultaneously.

[0022] The quick-release assembly is similar to the above locking structure. It also includes quick-release holes 66 provided at the ends of the fixed clamp 2 and the movable clamp 3 for the mounting base 6 to insert. A quick-release tooth 67 opposite to the locking rod 61 is movably mounted on the outer side of the middle part of the mounting base 6. On the side of the quick-release tooth 67 opposite to the locking rod 61, there are mutually fitting quick-release inclined surfaces 68. The quick-release inclined surfaces 68 convert the axial thrust of the locking rod 61 into the radial thrust of the quick-release tooth 67. A quick-release opening 69 for the quick-release tooth 67 to insert is formed on the inner side of the quick-release hole 66. When the mounting base 6 is axially and circumferentially positioned, the quick-release tooth 67 is synchronously inserted and engaged with the quick-release opening 69 under the guiding action of the quick-release inclined surfaces 68.

[0023] Furthermore, the buffer mechanism 5 includes a buffer sleeve 51 provided inside the quick-release hole 66, and an adaptive damping component is provided between the fixed clamp 2 and the movable clamp 3 and the buffer sleeve 51. In the buffer mechanism 5, the buffer sleeve 51 is ensured to have a certain degree of deflection flexibility by the adaptive damping component, so that the fixed clamp 2 and the movable clamp 3 are not rigidly connected to the mounting base 6, and have a good absorption effect on slight vibration and yaw.

[0024] Furthermore, the adaptive damping component is hidden at the ends of the fixed clip 2 and the movable clip 3, specifically including a damping cavity 52 provided at the ends of the fixed clip 2 and the movable clip 3. The buffer sleeve 51 is connected with a buffer ring 53 which is circular and has a C-shaped cross section. The outer side of the buffer ring 53 is fitted with the inner side of the damping cavity 52. A pair of conical spiral springs 54 are installed between the buffer ring 53 and the buffer sleeve 51. One end of the conical spiral spring 54 is fixedly connected with the buffer ring 53 and the buffer sleeve 51, and the other end is fixedly connected with the damping cavity 52. The spiral directions of the conical spiral springs 54 are opposite. The paired arrangement of the conical spiral springs 54 enables the buffer sleeve 51 and the buffer ring 53 to maintain dynamic balance, being in the central position in the normal state and automatically resetting after deformation and offset. The conical spiral springs 54 can also bear torsional force. When the fixed clip 2 or the movable clip 3 rotates and offsets circumferentially relative to the pull rod 1, the conical spiral springs 54 can provide a circumferential restoring force to drive its automatic reset.

[0025] In addition, similar to the existing wire clip structure, in this embodiment, the fixed clip 2 and the movable clip 3 respectively have a main clip head 21 and a sub-clip head 22 hinged to the main clip head 21. Opposite clip wire grooves 23 are provided between the main clip head 21 and the sub-clip head 22. A clamping bolt 24 which is hinged at the end of the sub-clip head 22 and inserted into the end of the main clip head 21 is threadedly connected with a clamping nut 25 which is in contact and presses against the main clip head 21. The opening and closing of the main clip head 21 and the sub-clip head 22 realize the clamping and fixing of the cable. By adjusting the opening and closing angle of the clamping bolt 24, its clamping stability is ensured. Insulating layers are also covered on the inner sides of the main clip head 21 and the sub-clip head 22.

[0026] Meanwhile, in order to facilitate the assembly and molding of the movable clip 3, the ball-socket rotating mechanism 4 includes a rotating seat 41 provided in the middle of the movable clip 3. Sealing covers 42 are fixed on both sides of the rotating seat 41 through threaded parts. A rotating cavity 43 is left between the rotating seat 41 and the inside of the sealing covers 42. Rotating openings 44 for inserting the main clip head 21 are provided at the upper ends of the rotating seat 41 and the sealing covers 42. The rotating openings 44 limit the movement range of the movable clip 3. The main clip head 21 of the movable clip 3 is connected with a rotating ball 45 movably installed in the rotating cavity 43. A viscous damping component 7 is provided between the sealing covers 42, the rotating seat 41 and the rotating ball 45. The rotating ball 45 is in contact with the inside of the rotating cavity 43. The damping force provided by the viscous damping component 7 is proportional to the swinging speed of the rotating ball 45 and the movable clip 3.

[0027] Visibly, different from the existing damping structures, the viscous damping assembly 7 in this embodiment is applicable to a ball-and-socket joint. Specifically, the viscous damping assembly 7 includes a damping groove 71 provided at the bottom of the rotating seat 41. The bottom of the damping groove 71 is arc-shaped. The rotating ball 45 has a damping block 72 extending into the damping groove 71 and fitting with its bottom. The movement range of the damping block 72 is consistent with the yaw range of the movable clip 3. Damping push bars 73 arranged in central symmetry are installed inside the damping groove 71. One end of each damping push bar 73 presses against the damping block 72, and the other end is opposite to a fluid chamber 74 hidden inside the rotating seat 41 and the closing cover 42. The fluid chambers 74 are interconnected through viscous flow channels 75 and filled with a damping medium inside. When the movable clip 3 receives an external impact and the ball-and-socket rotating mechanism 4 moves, the damping block 72 moves and pushes the damping push bars 73, and the damping medium inside the fluid chamber 74 is squeezed and flows. Under the action of shear force, the impact force is absorbed, and the shear force is proportional to the angular velocity when the movable clip 3 yaws. When the movable clip 3 slowly offsets to adjust the orientation of its cable, the flow rate of the damping medium inside the viscous flow channel 75 is relatively low, and its damping force is also at a relatively low level. An elastic reset member is usually provided inside the fluid chamber 74 to realize the automatic reset of the viscous damping assembly 7.

[0028] Obviously, pin holes 11 are respectively formed at both ends of the pull rod 1, and pins 12 opposite to the fixed clip 2 and the movable clip 3 are inserted into the pin holes 11. The pins 12 axially limit the mounting base 6 to prevent the mounting base 6 from accidentally falling off.

[0029] Preferably, the pull rod 1 is made of a casting material to meet the forming requirements of its surface locking port 64, and the fixed clip 2 and the movable clip 3 are made of forged aluminum alloy to ensure their overall service life and structural strength.

[0030] In summary, the principle of this embodiment is as follows: The fixed clip 2 and the movable clip 3 are installed on the pull rod 1 to clamp the cable. Among them, the ball-and-socket rotating mechanism 4 maintains the movement allowance of the movable clip 3, and the buffer mechanism 5 further provides damping buffering for the fixed clip 2 and the movable clip 3.

[0031] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0032] Although terms such as tie rod 1, pin hole 11, bolt 12, fixed clamping member 2, main chuck 21, sub-chuck 22, clamping groove 23, clamping bolt 24, clamping nut 25, movable clamping member 3, ball socket rotating mechanism 4, rotating base 41, closed cover 42, rotating cavity 43, rotating port 44, rotating ball 45, buffer mechanism 5, buffer sleeve 51, damping cavity 52, buffer ring 53, conical spiral spring 54, mounting base 6, locking rod 61, locking teeth 62, locking inclined surface 63, locking port 64, locking nut 65, quick-release hole 66, quick-release teeth 67, quick-release inclined surface 68, quick-release port 69, viscous damping assembly 7, damping groove 71, damping block 72, damping push bar 73, fluid cavity 74, viscous flow path 75 are used more frequently in this text, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A flexible adjustable-distance wire clamp made of high-strength forged aluminum with a small cross-section, comprising a pull rod (1), characterized in that An axially limited and circumferentially rotatable fixed clip (2) and a movable clip (3) are installed on the pull rod (1). The movable clip (3) is equipped with a ball socket rotating mechanism (4). A buffer mechanism (5) is provided between the fixed clip (2), the movable clip (3) and the pull rod (1).

2. The flexible pitch-adjustable wire clamp made of high-strength forged aluminum with a small cross-section according to claim 1, characterized in that, Mounting bases (6) corresponding to the fixed clip (2) and the movable clip (3) one by one are installed on the pull rod (1). A quick-release component is provided between the mounting base (6), the fixed clip (2) and the movable clip (3).

3. The small cross-section high-strength forged aluminum flexible pitch-adjustable wire clamp according to claim 2, wherein The mounting base (6) is cylindrical. A number of locking rods (61) arranged centrosymmetrically with respect to the central axis of the mounting base (6) are slidably installed in the mounting base (6). A locking tooth (62) opposite to the locking rod (61) is movably installed on the inner side of the mounting base (6). A locking inclined surface (63) that fits each other is provided on the side of the locking tooth (62) opposite to the locking rod (61). The locking inclined surface (63) converts the axial thrust of the locking rod (61) into the radial thrust of the locking tooth (62). A locking opening (64) for the locking tooth (62) to insert is formed on the pull rod (1). A locking nut (65) is threadedly installed at the end of the mounting base (6), and the locking nut (65) presses against the locking rod (61). The quick-release component includes a quick-release hole (66) provided at the ends of the fixed clip (2) and the movable clip (3) for the mounting base (6) to insert. A quick-release tooth (67) opposite to the locking rod (61) is movably installed on the outer side of the middle part of the mounting base (6). A quick-release inclined surface (68) that fits each other is provided on the side of the quick-release tooth (67) opposite to the locking rod (61). The quick-release inclined surface (68) converts the axial thrust of the locking rod (61) into the radial thrust of the quick-release tooth (67). A quick-release opening (69) for the quick-release tooth (67) to insert is formed on the inner side of the quick-release hole (66).

4. The flexible adjustable pitch wire clamp of a small cross-section high-strength forged aluminum type according to claim 3, characterized in that, The buffer mechanism (5) includes a buffer sleeve (51) provided on the inner side of the quick-release hole (66). An adaptive damping component is provided between the fixed clip (2), the movable clip (3) and the buffer sleeve (51).

5. The flexible adjustable pitch wire clamp of the small cross-section high-strength forged aluminum type according to claim 4, characterized in that, The adaptive damping component includes a damping cavity (52) provided at the ends of the fixed clip (2) and the movable clip (3). The buffer sleeve (51) is connected with a buffer ring (53) that is circular and has a C-shaped cross section. The outer side of the buffer ring (53) is in contact with the inner side of the damping cavity (52). A pair of conical spiral springs (54) are installed between the buffer ring (53) and the buffer sleeve (51). One end of the conical spiral spring (54) is fixedly connected to the buffer ring (53) and the buffer sleeve (51), and the other end is fixedly connected to the damping cavity (52). The spiral directions of the conical spiral springs (54) are opposite.

6. The flexible adjustable pitch wire clamp of a small cross-section high-strength forged aluminum type according to claim 1, wherein The described fixed clamp (2) and movable clamp (3) respectively have a main chuck (21) and a sub-chuck (22) hinged to the main chuck (21). A relative wire clamping groove (23) is provided between the main chuck (21) and the sub-chuck (22). A clamping bolt (24) that is inserted into the end of the main chuck (21) is hinged at the end of the sub-chuck (22). The clamping bolt (24) is threadedly connected with a clamping nut (25) that fits and presses against the main chuck (21).

7. The flexible adjustable pitch wire clamp of a small cross-section high-strength forged aluminum type according to claim 6, characterized in that The described ball socket rotating mechanism (4) includes a rotating seat (41) provided in the middle of the movable clamp (3). Sealing covers (42) are fixed on both sides of the rotating seat (41) through threaded parts. A rotating cavity (43) is left between the rotating seat (41) and the inside of the sealing covers (42). A rotating opening (44) for inserting the main chuck (21) is opened at the upper ends of the rotating seat (41) and the sealing covers (42). The main chuck (21) of the movable clamp (3) is connected with a rotating ball (45) movably installed in the rotating cavity (43). A viscous damping assembly (7) is provided between the sealing covers (42), the rotating seat (41) and the rotating ball (45).

8. A small cross-section high-strength forged aluminum flexible adjustable-distance wire clamp according to claim 7, characterized in that The described viscous damping assembly (7) includes a damping groove (71) provided at the bottom of the rotating seat (41). The bottom of the damping groove (71) is arc-shaped. The rotating ball (45) has a damping block (72) that extends into the damping groove (71) and fits against its bottom. Damping push bars (73) arranged in central symmetry are installed on the inner side of the damping groove (71). One end of the damping push bar (73) presses against the damping block (72) and the other end is opposite to a fluid cavity (74) hidden in the rotating seat (41) and the sealing covers (42). The fluid cavities (74) are interconnected through viscous flow channels (75) and filled with a damping medium inside.

9. A small cross-section high-strength forged aluminum flexible adjustable pitch wire clamp according to claim 1, characterized in that, Pin holes (11) are respectively opened at both ends of the described pull rod (1). Plug pins (12) opposite to the fixed clamp (2) and the movable clamp (3) are inserted into the pin holes (11).

10. A small cross-section high-strength forged aluminum flexible pitch-adjustable wire clamp according to claim 1, characterized in that, The described pull rod (1) is made of cast material, and the fixed clamp (2) and the movable clamp (3) are made of forged aluminum alloy.

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