A length-fixing machine, connecting rod assembly and swing arm

Abstract

The present invention discloses a sizing machine, a connecting rod assembly, and a swing arm. The swing arm includes: a sleeve for connecting to a transmission shaft; a sleeve provided on the outer circumference of the sleeve; two side plates provided on the outer circumference of the sleeve, the two side plates being spaced apart to form a receiving cavity, the sleeve being located in the receiving cavity; a lead screw located in the receiving cavity and extending in the same direction as the two side plates, one end of the lead screw being rotatably disposed in the sleeve; a slider provided with an internal thread, located in the receiving cavity, and being threadably connected to the lead screw via the internal thread; the slider being moved along the extending direction of the lead screw by rotating the lead screw; the slider being used to connect to a power member, the power member applying thrust to the slider, causing the slider to drive the lead screw and the sleeve to rotate, thereby driving the transmission shaft to rotate. The use of the above-mentioned swing arm can solve the problem that the swing arm cannot adjust the connection position of the power member and the swing arm while transmitting power.

Description

Technical Field

[0001] The invention relates to the technical field of manufacturing parts of a sizing machine, in particular to a sizing machine, a connecting rod assembly and a rocker arm. Background Art

[0002] At present, the finished product cutting and collection system of my country's hot-rolled bar production line generally adopts a lifting and sizing machine. Through the lifting and lowering of the sizing machine baffle, it can withstand the high-energy impact load generated by the collision longitudinally, quickly absorb the initial kinetic energy of the finished rolled material on the conveyor roller, and make it instantly slow down to zero, so as to achieve the end face of the finished rolled material head to be stopped and aligned, and cooperate with the cold shearing machine to perform fixed-length shearing of different specifications and lengths on the tail of the rolled material.

[0003] In the prior art, the length-fixing machine's rocker arm is an integrated design, and the connection with the power part is fixed on the rocker arm. This structure can only transmit power. When the length-fixing machine's connecting rod assembly is subjected to force and an offset error occurs during power transmission, it cannot be adjusted. The entire connecting rod assembly needs to be adjusted, which makes maintenance troublesome.

[0004] Therefore, how to prevent the rocker arm from being unable to adjust the connection position between the power member and the rocker arm while transmitting power is a technical problem that those skilled in the art currently need to solve. Summary of the Invention

[0005] The present invention provides a rocker arm that solves the problem of being unable to adjust the connection position between the power element and the rocker arm while transmitting power. The present invention also provides a connecting rod assembly including the rocker arm. Another object of the present invention is to provide a length-fixing machine including the connecting rod assembly.

[0006] To achieve the above object, the present invention provides a swing rod, comprising:

[0007] Bushing, used to connect the drive shaft;

[0008] A sleeve, provided on the outer peripheral surface of the sleeve;

[0009] Two side plates are provided on the outer peripheral surface of the shaft sleeve, and the two side plates are spaced apart to form an accommodating cavity, in which the sleeve is located;

[0010] A lead screw is located in the accommodating cavity and has the same extension direction as the two side plates, and one end of the lead screw is rotatably disposed in the sleeve;

[0011] The slider is provided with an internal thread, is located in the accommodating cavity, and is connected to the screw thread through the internal thread. By rotating the screw, the slider moves along the extension direction of the screw; the slider is used to connect the power part, and the power part applies thrust to the slider, so that the slider drives the screw and the sleeve to rotate, thereby driving the transmission shaft to rotate.

[0012] Preferably, a groove slide is provided on one side of the two side panels facing the slider, the groove slide and the side panels extend in the same direction, and tenons are provided on both sides of the slider facing the two side panels, and the tenons are slidably arranged in the groove slide.

[0013] Preferably, two locking nuts are threadedly connected to the lead screw, and the two locking nuts are respectively located on both sides of the movable direction of the slider. When the two locking nuts press against the slider, the positions of the slider and the lead screw are fixed.

[0014] Preferably, a cover plate is provided on the side of the two side plates facing away from the sleeve, the cover plate is connected to the two side plates, the cover plate is provided with a through hole, a sleeve body is provided in the through hole, the screw is rotatably provided in the sleeve body, and the end of the screw facing away from the sleeve extends out of the accommodating cavity through the sleeve body.

[0015] Preferably, the shaft sleeve is provided with a stepped through hole, which includes a first hole and two second holes arranged coaxially, the first hole is located between the two second holes, the aperture of the first hole is smaller than the aperture of the second hole to form a shaft shoulder, and an expansion sleeve is respectively provided in the two second holes, the expansion sleeve and the shaft shoulder are abutted, and the expansion sleeve is used to sleeve the transmission shaft.

[0016] Preferably, a mounting groove is provided on the outer periphery of the shaft sleeve, the depth direction of the mounting groove is perpendicular to the axial direction of the first hole, and the sleeve is fixed in the mounting groove.

[0017] Preferably, the two side plates are provided with arc-shaped edges on the sides facing the shaft sleeve, and the arc-shaped edges are adapted to and fit the local outer circumference of the shaft sleeve.

[0018] Preferably, the two side plates and the shaft sleeve are connected by welding.

[0019] The present invention also provides a connecting rod assembly, including a power member and a transmission shaft, and also includes the above-mentioned rocker arm. The power member applies thrust to the slider, so that the slider drives the lead screw and the sleeve to rotate, thereby driving the transmission shaft to rotate.

[0020] The present invention also provides a sizing machine, comprising the above-mentioned connecting rod assembly.

[0021] In contrast to the above-mentioned background art, the present invention provides a rocker arm comprising: a sleeve, a bushing, two side plates, a lead screw, and a slider. The sleeve is used to connect to a transmission shaft; the sleeve is disposed on the outer circumference of the sleeve; the two side plates are disposed on the outer circumference of the sleeve, spaced apart to form a receiving cavity, in which the sleeve is located; the lead screw is located in the receiving cavity and extends in the same direction as the two side plates, with one end of the lead screw rotatably disposed in the sleeve; the slider is provided with an internal thread, is located in the receiving cavity, and is threadably connected to the lead screw via the internal thread; rotation of the lead screw causes the slider to move along the extension direction of the lead screw; the slider is used to connect to a power element, which applies thrust to the slider, causing the slider to rotate the lead screw and the sleeve, thereby driving the transmission shaft.

[0022] Specifically, the power element applies thrust to the slider connected to it, and the sleeve is used to connect to the transmission shaft. Two side plates are provided on the outer circumference of the sleeve, and a lead screw is provided in the accommodating cavity formed by the two side plates. The end of the lead screw is disposed in a sleeve on the outer circumference of the sleeve. The internal thread of the slider cooperates with the lead screw. When the lead screw is rotated, the slider moves. When the slider is subjected to thrust, the thrust is transmitted to the sleeve through the lead screw and then to the transmission shaft. In other words, the rocker arm provided by the present invention can not only transmit the power output by the power element, but also adjust the specific position of the slider through the lead screw, so that the force applied to the rocker arm is more reasonable, reducing contact stress, preventing the rocker arm from being damaged due to uneven force, and increasing the service life of the rocker arm.

[0023] In summary, the above-mentioned arrangement can solve the problem that the connection position between the power member and the rocker arm cannot be adjusted while the rocker arm transmits power. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0025] Figure 1 A front cross-sectional view of a swing rod provided by an embodiment of the present invention;

[0026] Figure 2 A side cross-sectional view of a swing rod provided by an embodiment of the present invention;

[0027] Figure 3 A front cross-sectional view of a middle shaft sleeve of a rocker arm provided by an embodiment of the present invention;

[0028] Figure 4 A side view of a middle shaft sleeve of a rocker arm provided by an embodiment of the present invention;

[0029] Figure 5 A front view of a middle side plate of a swing arm provided by an embodiment of the present invention;

[0030] Figure 6 A side view of a middle side plate of a swing arm provided by an embodiment of the present invention;

[0031] Figure 7 A schematic diagram of a slider in a swing arm provided by an embodiment of the present invention;

[0032] Figure 8 A top view of a cover plate in a rocker arm provided by an embodiment of the present invention;

[0033] in:

[0034] 100-swing rod;

[0035] 1-sleeve, 11-stepped through hole, 111-first hole, 112-second hole, 12-shoulder, 13-mounting groove;

[0036] 2-sleeve;

[0037] 3-side plate, 31-grooved slide, 32-arc edge;

[0038] 4-lead screw;

[0039] 5-slider, 51-internal thread, 52-tenon;

[0040] 6-lock nut;

[0041] 7-cover plate, 71-through hole;

[0042] 8-housing;

[0043] 9-Expansion sleeve. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] In order to enable those skilled in the art to better understand the solutions of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0046] The present invention provides a swing rod, please refer to Figure 1 and Figure 2 , comprising: a sleeve 1, a sleeve 2, two side plates 3, a lead screw 4, and a slider 5. The sleeve 1 is used to connect to the transmission shaft; the sleeve 2 is provided on the outer circumference of the sleeve 1; the two side plates 3 are provided on the outer circumference of the sleeve 1, and the two side plates 3 are spaced apart to form an accommodating cavity, in which the sleeve 2 is located; the lead screw 4 is located in the accommodating cavity and extends in the same direction as the two side plates 3. One end of the lead screw 4 is rotatably disposed in the sleeve 2; the slider 5 is provided with an internal thread 51, is located in the accommodating cavity, and is threadedly connected to the lead screw 4 via the internal thread 51. By rotating the lead screw 4, the slider 5 moves along the extension direction of the lead screw 4; the slider 5 is used to connect to a power component, which applies thrust to the slider 5, causing the slider 5 to drive the lead screw 4 and the sleeve 1 to rotate, thereby driving the transmission shaft to rotate.

[0047] Specifically, the power component applies thrust to the slider 5 connected to it, and the sleeve 1 is used to connect the transmission shaft. Two side plates 3 are provided on the outer circumference of the sleeve 1, and a screw 4 is provided in the accommodating cavity formed by the two side plates 3. The end of the screw 4 is provided in the sleeve 2 on the outer circumference of the sleeve 1. The internal thread 51 of the slider 5 cooperates with the screw 4. When the screw 4 is rotated, the slider 5 will move. When the slider 5 is subjected to thrust, it can be transmitted to the sleeve 1 through the screw 4.

[0048] It should be noted that to ensure free rotation of the screw 4 within the sleeve 2, the sleeve 2 and the end of the screw 4 are fitted with a clearance fit. Furthermore, to allow for connection to the power element, the slider 5 extends a certain distance toward the power element, and a circular connection hole is provided at the end of the slider 5 facing away from the screw 4 for connection to the power element. Furthermore, a flat surface is milled into the cylindrical shaft at the end of the screw 4 facing away from the sleeve 2. This arrangement facilitates stable rotation of the screw 4, thereby adjusting the position of the slider 5.

[0049] That is to say, the rocker arm provided by the present invention can not only transmit the power output by the power component, but also adjust the specific position of the slider 5 through the screw 4, so that the force on the rocker arm is more reasonable, the contact stress is reduced, the rocker arm is prevented from being damaged due to uneven force, and the service life of the rocker arm is increased.

[0050] In summary, the above-mentioned arrangement can solve the problem that the connection position between the power member and the rocker arm cannot be adjusted while the rocker arm transmits power.

[0051] Preferably, a groove slide 31 is provided on the side of the two side panels 3 facing the slider 5, and the groove slide 31 and the side panel 3 have the same extension direction. The slider 5 is provided with a tenon 52 on both sides facing the two side panels 3, and the tenon 52 can be slidably arranged in the groove slide 31.

[0052] It's understandable that the slider 5's primary and most important function is to transmit the power provided by the power element to the rocker arm. This requires the slider 5 to be able to move along the rocker arm to change the force applied to the entire rocker arm. The power provided by the power element is transmitted from the slider 5 to the lead screw 4. The lead screw 4 then transmits the power to the sleeve 1 via the sleeve 2 on the outer circumference of the sleeve 1. Finally, the sleeve 1 transmits the power to the mating drive shaft. This applies significant force to the lead screw 4, which can easily deform, rendering the rocker arm unusable and reducing its service life.

[0053] Please also refer to Figures 5 to 7Therefore, a groove slide 31 is provided on the side of the two side panels facing the slider 5, and the extension direction of the groove slide 31 and the side panel 3 is the same, and the slider 5 is provided with tenons 52 on both sides facing the two side panels 3, which can be slidably engaged in the groove slide 31. This arrangement can transmit the transmitted power to a part of the two side panels 3 through the cooperation of the tenons 52 and the groove slide 31, so that the screw 4 will not be subjected to too much force and cause the screw 4 to deform. The two side panels 3 share part of the force, which can make the force on the entire rocker arm more uniform and reasonable, and can increase the service life of the rocker arm. In addition, the screw 4 passes through the inside of the slider 5, and the slider 5 can change its position by rotating the screw 4. However, if there are no settings on both sides of the slider 5 to limit the rotation of the slider 5 around the screw 4, the slider 5 may also rotate when the screw 4 rotates, which will cause interference with the connection with the power part, making the power transmission not smooth and easily damaging the slider 5; therefore, the tenons 52 on both sides of the slider 5 are stuck in the grooves and slip, which can limit the rotation of the slider 5, so that the slider 5 can only move along the screw 4 and cannot rotate.

[0054] In this embodiment, the groove slide 31 is in the shape of a rectangle, and the tenons 52 on both sides of the slider 5 are in a shape that matches the groove slide 31; of course, according to actual conditions, the groove slide 31 and the tenons 52 on both sides of the slider 5 can be set to other shapes as long as they can meet the requirements.

[0055] In some embodiments, two locking nuts 6 are threadedly connected to the screw 4. The two locking nuts 6 are respectively located on both sides of the movable direction of the slider 5. When the two locking nuts 6 press against the slider 5, the positions of the slider 5 and the screw 4 are fixed.

[0056] It is understandable that the slider 5 can move with the rotation of the screw 4. When the screw 4 stops rotating, the slider 5 will stay at a certain position and no longer move. However, when the slider 5 is subjected to power transmitted from the power component, if the transmitted power is relatively large, it is easy for the slider 5 to be forcibly moved under the large power, thereby forcing the screw 4 to rotate; this situation will cause the slider 5 to move to a non-ideal force-bearing position, thereby losing the effect that the slider 5 and the screw 4 should achieve.

[0057] Therefore, it is necessary to provide locking nuts 6 on both sides of the movable direction of the slider 5, and the locking nuts 6 are connected to the screw 4 through threads, and when the locking nuts 6 press against the slider 5, the relative positions of the slider 5 and the screw 4 will be fixed; in this way, when the slider 5 is adjusted to a suitable position to start transmitting power, the slider 5 can stably transmit power to the screw 4 and the two side plates 3, and will not be forced to move due to a large force, causing unreasonable force on the entire structure.

[0058] Of course, according to the magnitude of the transmitted power, the number of locking nuts 6 on both sides of the movable direction of the slider 5 can be adjusted so that the positions of the slider 5 and the lead screw 4 can be stably fixed.

[0059] In some embodiments, a cover plate 7 is further provided on the side of the two side plates 3 facing away from the sleeve 1. The cover plate 7 is connected to the two side plates 3. The cover plate 7 is provided with a through hole 71. A sleeve body 8 is provided in the through hole 71. The screw 4 is rotatably provided in the sleeve body 8, and the end of the screw 4 facing away from the sleeve 1 extends out of the accommodating cavity through the sleeve body 8.

[0060] Please also refer to Figure 8 Specifically, two side plates 3 are provided on the sleeve 1, and the two side plates 3 form an accommodating cavity. A screw 4 is provided in the accommodating cavity, and one end of the screw 4 is rotatably arranged in the sleeve 2 on the sleeve 1; a cover plate 7 is also provided on the side of the two side plates 3 away from the sleeve 1, and the suspended ends of the two side plates 3 are connected to the cover plate 7 by bolts, so that the two side plates 3, the sleeve 1 and the cover plate 7 together form a complete accommodating cavity, and the end of the screw 4 away from the sleeve 1 can be rotatably passed through the sleeve body 8 set in the through hole 71 on the cover plate 7 and extend out of the accommodating cavity.

[0061] It can be understood that the two side plates 3 and the lead screw 4 need to transmit power, and the two need to be stably connected together so that the power can be transmitted to the transmission shaft; the two side plates 3 and the lead screw 4 are connected together through the shaft sleeve 1 and the cover plate 7, so that the overall strength of the rocker arm is higher; the lead screw 4 is arranged in the accommodating cavity, one end of which is rotatably connected to the sleeve 2 on the shaft sleeve 1, and the other end is rotatable through the sleeve body 8 set in the through hole 71 on the cover plate 7, which not only makes the lead screw 4 have higher strength, but also ensures the rotation of the lead screw 4.

[0062] In this embodiment, please refer to Figure 1 The connection between the two side panels 3 and the cover plate 7 is achieved through the cooperation of bolts and threaded holes. Two threaded holes are respectively provided on the two side panels 3, and through-type bolt holes are provided on the cover plate 7 corresponding to the threaded holes for fixing with bolts.

[0063] Of course, other connection methods can be selected according to actual conditions, but bolt connection is convenient, stable, easy to repair and replace, and low cost. This article does not impose any specific restrictions on the connection method between the two side panels 3 and the cover 7, as long as it meets the requirements.

[0064] Preferably, the sleeve 1 is provided with a stepped through hole 11, which includes a coaxially arranged first hole 111 and two second holes 112. The first hole 111 is located between the two second holes 112. The aperture of the first hole 111 is smaller than the aperture of the second hole 112 to form a shaft shoulder 12. An expansion sleeve 9 is respectively provided in the two second holes 112. The expansion sleeve 9 and the shaft shoulder 12 are abutted, and the expansion sleeve 9 is used to sleeve the drive shaft.

[0065] Please also refer to Figure 3 and Figure 4 Specifically, the sleeve 1 is generally cylindrical, with holes of a certain depth, known as second holes 112, disposed on both bottom surfaces of the cylinder. The two second holes 112 are symmetrically distributed, identical in size and depth, and positioned opposite each other. A through hole 71, smaller in diameter than the second holes 112, is disposed on the bottom surface of the second holes 112. This through hole 71 serves as the first hole 111, which penetrates the two second holes 112. The unpierced portion of the second holes 112 forms a shoulder 12. The first and second holes 111, 112 form a stepped through hole 11, coaxially arranged. An expansion sleeve 9 is disposed within the second hole 112, abutting against the shoulder 12 to accommodate the drive shaft.

[0066] It can be understood that the sleeve 1 is connected to the drive shaft, so there is a through hole inside the sleeve 1 as the first hole 111, which is used to insert the drive shaft; in order to make the connection between the drive shaft and the sleeve 1 more stable, an expansion sleeve 9 is provided at the connection between the sleeve 1 and the drive shaft. The expansion sleeve 9 is installed in the second hole 112 on the sleeve 1 and abuts against the shaft shoulder 12 to prevent the expansion sleeve 9 from sliding.

[0067] In some embodiments, a mounting groove 13 is provided on the outer periphery of the shaft sleeve 1 , the depth direction of the mounting groove 13 is perpendicular to the axial direction of the first hole 111 , and the sleeve 2 is fixed in the mounting groove 13 .

[0068] It can be understood that the sleeve 2 is used to rotate and connect the screw 4. In order to provide a stable fulcrum for the screw 4, the sleeve 2 needs to be fixedly connected to the sleeve 1; therefore, in order to make the overall structure of the rocker arm more reasonable, a mounting groove 13 is provided on the outer periphery of the sleeve 1, and the depth direction of the mounting groove 13 is perpendicular to the axial direction of the first hole 111, and the sleeve 2 is fixedly installed in the mounting groove 13. In this way, the space in the accommodating cavity formed by the two side plates 3 will not be occupied, and the provision of the mounting groove 13 on the outer periphery of the sleeve 1 will make the fixation of the sleeve 2 more stable, and can also transmit greater force to the sleeve 1 through the screw 4.

[0069] In this embodiment, it is preferred to provide a mounting groove 13 on the shaft sleeve 1. However, depending on actual conditions, a protruding structure may also be provided on the outer periphery of the shaft sleeve 1 for fixing the mounting sleeve 2. This is not specifically limited herein.

[0070] Preferably, the two side panels 3 are provided with arc-shaped edges 32 on the side facing the shaft sleeve 1 , and the arc-shaped edges 32 are adapted to and fit the local outer circumference of the shaft sleeve 1 .

[0071] It is understood that matching and fitting the edges can provide a more stable connection and better overall structural integrity.

[0072] In this embodiment, please refer to Figure 2 and Figure 6 In order to be able to cooperate and connect with the shaft sleeve 1, the two side plates 3 are provided with an arc-shaped edge 32 on the side facing the shaft sleeve 1, and the edge can adapt to and fit the local outer periphery of the shaft sleeve 1; in this way, the connection between the two side plates 3 and the shaft sleeve 1 is more stable and not easy to break, thereby increasing the overall strength of the rocker arm.

[0073] Preferably, the two side plates 3 and the shaft sleeve 1 are connected by welding.

[0074] It is understandable that the two side panels 3 need to transmit a large force to the shaft sleeve 1, and then transmit it to the drive shaft through the shaft sleeve 1. Therefore, the connection between the two side panels 3 and the shaft sleeve 1 must be stable. In addition, the space at the connection between the two side panels 3 and the shaft sleeve 1 is relatively small, and if other connecting devices are added, the manufacturing cost will increase.

[0075] Therefore, in this embodiment, the connection method between the two side panels 3 and the shaft sleeve 1 is preferably welding. This connection method has a simple processing procedure, and the welded structure has high rigidity, good integrity, and a strong and durable structure. There is no need to set other structures on the side panels 3 or the shaft sleeve 1, which reduces manufacturing costs.

[0076] The present invention provides a connecting rod assembly, including a power member and a transmission shaft, and also includes the rocker arm described in the above specific embodiment. The power member applies thrust to the slider 5, so that the slider 5 drives the screw 4 and the sleeve 1 to rotate, thereby driving the transmission shaft to rotate.

[0077] In addition, the present invention provides a sizing machine with a connecting rod assembly, which includes the connecting rod assembly described in the above specific embodiment; other parts of the sizing machine can refer to the existing technology and will not be elaborated in this article.

[0078] In summary, the use of the above-mentioned rocker arm to transmit power can not only transmit the power output by the power component, but also adjust the position of the slider 5 by rotating the screw 4, so that the overall force on the rocker arm is more reasonable, increasing the strength of the rocker arm, thereby increasing the service life of the rocker arm, and will not damage the rocker arm due to the concentrated force on the rocker arm components due to the rocker arm swinging to certain positions, thereby solving the problem that the rocker arm cannot adjust the connection position between the power component and the rocker arm while transmitting power.

[0079] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0080] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A pendulum rod, characterized in that: include: A shaft sleeve (1) for connecting a transmission shaft; A sleeve (2) is provided on the outer peripheral surface of the shaft sleeve (1); Two side plates (3) are provided on the outer peripheral surface of the shaft sleeve (1), and the two side plates (3) are spaced apart to form an accommodating cavity, and the sleeve (2) is located in the accommodating cavity; A lead screw (4) is located in the accommodating cavity and has the same extension direction as the two side plates (3), and one end of the lead screw (4) is rotatably disposed in the sleeve (2); The slider (5) is provided with an internal thread (51), is located in the accommodating cavity, and is threadably connected to the lead screw (4) via the internal thread (51). By rotating the lead screw (4), the slider (5) moves along the extension direction of the lead screw (4); the slider (5) is used to connect to a power member, and the power member applies a thrust to the slider (5), so that the slider (5) drives the lead screw (4) and the sleeve (1) to rotate, thereby driving the transmission shaft to rotate; The lead screw (4) is also threadedly connected to two locking nuts (6), and the two locking nuts (6) are respectively located on both sides of the movable direction of the slider (5). When the two locking nuts (6) abut against the slider (5), the positions of the slider (5) and the lead screw (4) are fixed; A cover plate (7) is further provided on one side of the two side plates (3) facing away from the shaft sleeve (1), the cover plate (7) and the two side plates (3) are connected, the cover plate (7) is provided with a through hole (71), a sleeve body (8) is provided in the through hole (71), the lead screw (4) is rotatably provided in the sleeve body (8), and the end of the lead screw (4) facing away from the shaft sleeve (1) extends out of the accommodating cavity through the sleeve body (8); The shaft sleeve (1) is provided with a stepped through hole (11), and the stepped through hole (11) includes a first hole (111) and two second holes (112) arranged coaxially, the first hole (111) is located between the two second holes (112), the aperture of the first hole (111) is smaller than the aperture of the second hole (112), so as to form a shaft shoulder (12), and an expansion sleeve (9) is respectively provided in the two second holes (112), the expansion sleeve (9) and the shaft shoulder (12) are in abutment with each other, and the expansion sleeve (9) is used for sleeve-mounting the transmission shaft.

2. The rocker according to claim 1, wherein: A groove slideway (31) is provided on one side of the two side panels (3) facing the slider (5), and the groove slideway (31) and the side panels (3) extend in the same direction. The slider (5) is provided with a tenon (52) on both sides facing the two side panels (3), and the tenon (52) is slidably arranged in the groove slideway (31).

3. The rocker according to claim 1, wherein: The outer periphery of the shaft sleeve (1) is provided with a mounting groove (13), the depth direction of the mounting groove (13) is perpendicular to the axial direction of the first hole (111), and the sleeve (2) is fixed in the mounting groove (13).

4. The rocker according to claim 1, wherein: The two side plates (3) are provided with arc-shaped edges (32) on one side facing the shaft sleeve (1), and the arc-shaped edges (32) are adapted to and fit the local outer periphery of the shaft sleeve (1).

5. The pendulum rod according to claim 4, characterized in that: The connection between the two side plates (3) and the shaft sleeve (1) is achieved by welding.

6. A connecting rod assembly, comprising a power member and a transmission shaft, characterized in that: It also includes a rocker as described in any one of claims 1 to 5, wherein the power member applies a thrust to the slider (5), so that the slider (5) drives the lead screw (4) and the sleeve (1) to rotate, thereby driving the transmission shaft to rotate.

7. A length-fixing machine, characterized in that: Comprising the connecting rod assembly as claimed in claim 6.

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