Anti-return structure and hanging lifting arm
By setting up anti-rewinding parts on the discharge track of the hanging lifting arm to prevent the hanger roller from falling back, the problem of the hanger roller falling back and falling at the outlet position is solved, and the effect of improving production efficiency and extending the service life of the equipment is achieved.
Patent Information
- Application Number
- CN202421658406.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-12
AI Technical Summary
The hanger roller may fall back and drop at the exit position of the hanging lifting arm, resulting in inefficiency and equipment damage.
An anti-return structure is designed, including a housing, a lifting assembly, a track pipe and a hanger roller. By providing an anti-returning member protruding at least partially from the discharge rail on the discharge rail, the hanger roller prevents the hanger roller from retracting to the lifting rail in the negative direction of the X-axis.
Effectively prevent the hanger roller from falling back to the lifting track and falling, improve production efficiency, extend the service life of the anti-returned parts, and reduce the possibility that the hanger roller will overturn the anti-returned parts.
Smart Images
Figure CN222906686U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of garment production lines, in particular to an anti-backward structure and a hanging lifting arm. Background Art
[0002] A hanging production line usually has a hanging lifting arm before the hanger exit station. The main function of the lifting arm is to lift the hanger on which the work at the work station or the bridging station is completed and convey it back to the main track of the production line, so that the sewing material on the hanger can enter the next process for processing;
[0003] Generally, the lifting push block in the lifting arm rotates cyclically under the drive of a motor to lift the hanger roller entering the bottom of the lifting arm through the lifting arm inlet to the top lifting arm outlet;
[0004] However, after the hanger roller leaves the top outlet and enters the discharge track, the swing of the hanger body may drive the hanger roller to move backward along the discharge track, resulting in the possibility that the hanger roller may move back to the lifting track and fall off. Summary of the Utility Model
[0005] Based on this, in view of the problem that the hanger roller currently has the problem of backward movement and falling at the outlet position of the hanging lifting arm, it is necessary to provide an anti-backward structure and a hanging lifting arm that are not prone to backward movement.
[0006] The present application first provides an anti-backward structure, including a housing, a lifting assembly, a track pipe, and a hanger roller. The track pipe includes a lifting pipe and a discharge pipe fixed to the top end of the lifting pipe. A lifting track is formed between the housing and the lifting pipe. The upper side of the discharge pipe is a discharge track. The lifting assembly is arranged inside the housing and is used to lift the hanger roller along the lifting track. At least part of an anti-backward member protruding from the discharge track is arranged on the housing and / or the track pipe. The anti-backward member is located at one end of the discharge track close to the lifting track, and the anti-backward member is used to block the hanger roller on the discharge track from rolling along the negative X-axis direction to the lifting track.
[0007] In one embodiment, the anti-backward member is hinged to the housing, and a limit pin for abutting against the anti-backward member is also fixed on the housing to limit the anti-backward member between an initial state and an avoidance state;
[0008] In the initial state, the anti-backward member blocks the discharge track along the X-axis direction; in the avoidance state, an opening communicating with the discharge track is formed between the anti-backward member and the discharge pipe.
[0009] In one embodiment, the anti-backward member includes an anti-overrun rod and a check rod. One end of the anti-overrun rod is hinged to the housing, and the check rod is fixed to the other end of the anti-overrun rod;
[0010] In the initial state, the anti-overshoot rod blocks the lifting track along the Z-axis direction, and the check rod blocks the discharging track along the X-axis direction.
[0011] In one of the embodiments, in the avoidance state, the length direction of the anti-overshoot rod is located between the positive direction of the X-axis and the positive direction of the Z-axis.
[0012] In one of the embodiments, an elastic reset member is further connected between the anti-overshoot rod and the housing to drive the anti-backoff member to return to an initial state.
[0013] In one embodiment, a first limiting protrusion and a second limiting protrusion are fixed on the anti-overshoot rod;
[0014] In the initial state, the first limiting protrusion abuts against the limiting pin to limit the anti-backoff member from rotating in the negative direction of the Z axis;
[0015] In the avoidance state, the second limiting protrusion abuts against the limiting pin to limit the anti-backoff component from rotating in the positive direction of the Z axis.
[0016] In one of the embodiments, one anti-backoff member is hingedly connected to each of two sides of the shell along the Y-axis direction.
[0017] In one of the embodiments, a rotating shaft is rotatably connected to the shell, the rotating shaft penetrates the shell along the Y-axis direction, and the two anti-backoff members are fixed to the rotating shaft.
[0018] In one of the embodiments, the anti-backward member is fixed to one end of the discharge pipe close to the lifting track.
[0019] A second aspect of the present application provides a suspension lifting arm, comprising the above-mentioned anti-rollback structure.
[0020] The anti-retraction structure is provided with an anti-retraction member that at least partially protrudes from the discharge track. The anti-retraction member can block the hanger roller on the discharge track from retracting along the negative direction of the X-axis to prevent the hanger roller from retracting to the lifting track and falling off.
[0021] In addition, by arranging the anti-return part at one end of the discharging track close to the lifting track, the hanger roller staying at the discharging position will only contact the anti-return part when it swings significantly. On the one hand, the contact frequency is low, which can increase the service life of the anti-return part. On the other hand, when the hanger roller swings to contact the anti-return part, most of its kinetic energy has been converted into gravitational potential energy, that is, the impact force with the anti-return part is relatively small at this time, which can avoid the hanger roller from rolling over the anti-return part. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 Front view of one embodiment of the hanging lifting arm of the present application;
[0023] Figure 2 It is Figure 1 Stereogram when the anti - back - off structure in [[]] is in the initial state and the clothes hanger roller abuts against the anti - back - off part after hiding the outer shell of the anti - back - off structure;
[0024] Figure 3 It is Figure 1 Front view of the anti - back - off structure in [[]] when the anti - back - off part is in the initial state and the clothes hanger roller abuts against the anti - back - off part;
[0025] Figure 4 It is Figure 1 Front view of the anti - back - off structure in [[]] when the anti - back - off part is in the avoidance state;
[0026] Figure 5 It is Figure 1 Front view of the anti - back - off structure in [[]] when the anti - back - off part is in the initial state and the clothes hanger roller abuts against the anti - check rod;
[0027] Figure 6 Stereogram of another embodiment of the anti - back - off structure of the present application.
[0028] Reference numerals: 10, housing; 11, limit pin; 20, lifting assembly; 30, track tube; 31, lifting tube; 32, discharge tube; 40, clothes hanger roller; 50, lifting track; 60, discharge track; 70, anti - back - off part; 71, anti - overshoot rod; 711, first limit protrusion; 712, second limit protrusion; 72, anti - check rod; 80, elastic reset part; 90, rotating shaft. Detailed implementation manners
[0029] To make the above - mentioned objects, features and advantages of the present utility model more obvious and understandable, the following will describe the detailed implementation manners of the present utility model with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.
[0030] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present utility model.
[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.
[0032] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0033] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.
[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.
[0035] For the convenience of description, in this application, the length direction of the lifting rail 50 is defined as the Z-axis direction, the length direction of the discharge rail 60 is defined as the X-axis direction, and the direction perpendicular to the XOZ plane is defined as the Y-axis direction, wherein the lifting direction of the lifting rail 50 is the positive direction of the Z-axis, and the discharge direction of the hanger roller 40 along the discharge rail 60 is the positive direction of the X-axis.
[0036] Please combine Figure 1 as well as Figure 2 As shown, the present application first provides an anti-backoff structure, including a shell 10, a lifting assembly 20, a track tube 30 and a hanger roller 40, the track tube 30 including a lifting tube 31 and a discharge tube 32 fixed to the top of the lifting tube 31, a lifting track 50 is formed between the shell 10 and the lifting tube 31, the upper side of the discharge tube 32 is a discharge track 60, the lifting assembly 20 is arranged inside the shell 10 and is used to lift the hanger roller 40 along the lifting track 50, the shell 10 and / or the track tube 30 are provided with an anti-backoff member 70 which at least partially protrudes from the discharge track 60, the anti-backoff member 70 is located at one end of the discharge track 60 close to the lifting track 50, and the anti-backoff member 70 is used to prevent the hanger roller 40 on the discharge track 60 from rolling along the negative direction of the X-axis to the lifting track 50.
[0037] In the present application, by setting an anti-rollback member 70 that at least partially protrudes from the discharge track 60, the anti-rollback member 70 can block the hanger roller 40 on the discharge track 60 from retracting along the negative direction of the X-axis, so as to prevent the hanger roller 40 from retracting to the lifting track 50 and falling.
[0038] It is worth mentioning that the anti-return member 70 of the present application is located at one end of the discharge track 60 close to the lifting track 50. Compared with other solutions in which the anti-return member 70 is arranged at the discharge pipe 32 close to the discharge position, since the anti-return member 70 is close to the discharge position where the hanger roller 40 stops, a slight shaking of the hanger body will drive the hanger roller 40 to swing and contact the anti-return member 70. On the one hand, the frequent collision of the hanger roller 40 with the anti-return member 70 will affect the service life of the anti-return member 70. On the other hand, the swing amplitude of the hanger roller 40 is large, and the impact force on the anti-return member 70 is strong, and the hanger roller 40 may climb over the anti-return member 70.
[0039] In the present application, since the anti-return component 70 is located at one end of the discharging track 60 close to the lifting track 50, the hanger roller 40 staying at the discharging position will only contact the anti-return component 70 when it swings significantly (swings along the negative direction of the X-axis to close to the exit position of the lifting track 50). On the one hand, the contact frequency is low, which can increase the service life of the anti-return component 70. On the other hand, when the hanger roller 40 swings to contact the anti-return component 70, most of its kinetic energy has been converted into gravitational potential energy, that is, at this time, the impact force with the anti-return component 70 is relatively small, which can prevent the hanger roller 40 from rolling over the anti-return component 70.
[0040] Please combine Figure 1 as well as Figure 2 As shown, in some embodiments, the anti-retraction member 70 is hinged to the housing 10, and the housing 10 is also fixed with a limit pin 11 for abutting against the anti-retraction member 70 to limit the anti-retraction member 70 between the initial state and the avoidance state;
[0041] In the initial state, the anti-retraction member 70 blocks the discharge track 60 along the X-axis direction; in the avoidance state, an opening communicating with the discharge track 60 is formed between the anti-retraction member 70 and the discharge pipe 32 .
[0042] In the avoidance state, the hanger roller 40 can enter the discharge track 60 from the lifting track 50 through the anti-return component 70 , while in the initial state, the anti-return component 70 can prevent the hanger roller 40 from retreating to the lifting track 50 .
[0043] Of course, in some other embodiments, the anti-return member 70 may also be movably connected to the shell 10 and / or the track tube 30 in other ways, such as a sliding connection, etc., as long as the hanger roller 40 can enter the discharge track 60 from the lifting track 50 through the anti-return member 70, and the anti-return member 70 can prevent the hanger roller 40 from retracting to the lifting track 50.
[0044] It should be noted that the two states of the anti-retraction member 70 can be switched actively or passively. As long as the anti-retraction member 70 can be switched to the avoidance state after the hanger roller 40 is lifted to the exit position of the lifting track 50, and can be restored to the initial state after the hanger roller 40 passes the exit position, the present application does not make further limitations here.
[0045] Taking active switching as an example: a sensor can be set at the exit position of the lifting track 50, a driving member can be set for the anti-backward member 70, and the sensor and the driving member are electrically connected. When the sensor detects the hanger roller 40, the driving member is controlled to start and drive the anti-backward member 70 to switch to the avoidance state. When the hanger roller 40 passes the exit position, the driving member drives the anti-backward member 70 back to the initial state;
[0046] Take passive switching as an example: when the anti-retraction member 70 is hingedly or slidingly connected to the shell 10 and / or the track tube 30, after the hanger roller 40 is lifted to contact the anti-retraction member 70, the anti-retraction member 70 will switch to an avoidance state under the squeezing force of the hanger roller 40, and return to the initial state after the hanger roller 40 passes through the exit position. The anti-retraction member 70 can rely on the elastic member to restore, or it can rely on its own gravity to restore, and the present application does not limit this.
[0047] It is worth mentioning that, most of the current hanging lifting arms are driven by a motor to circulate the lifting push block to lift the hanger roller 40 entering the bottom of the lifting arm through the lifting arm entrance to the lifting arm exit at the top. Under normal circumstances, when the lifting push block is lifted to the exit position, the lifting push block will stop lifting, and the hanger roller 40 will roll forward under the action of gravity and enter the exit position;
[0048] However, when the lifting push block does not stop accurately at the exit position and overshoots, it will drive the hanger roller 40 to overshoot together and cause the hanger roller 40 to interfere with the C-tube or other structures of the lifting arm and get stuck, thereby causing the hanger roller 40 to fail to exit normally.
[0049] Please combine Figure 1 , Figure 2 as well as Figure 3 As shown, in some embodiments, the anti-backoff member 70 includes an anti-overshoot rod 71 and a check rod 72, one end of the anti-overshoot rod 71 is hinged to the shell 10, and the check rod 72 is fixed to the other end of the anti-overshoot rod 71; in the initial state, the anti-overshoot rod 71 blocks the lifting track 50 along the Z-axis direction, and the check rod 72 blocks the discharge track 60 along the X-axis direction.
[0050] When the hanger roller 40 rises along the lifting track 50, it will contact the anti-overshoot rod 71 located in the lifting track 50. The anti-overshoot rod 71 can block the hanger roller 40 and play a buffering role to avoid overshooting caused by the hanger roller 40 being too fast. The anti-overshoot rod 71 plays an effect of preventing the hanger roller 40 from overshooting.
[0051] In addition, since the anti-return member 70 is hinged to the shell 10, the anti-return member 70 can rotate to the avoidance state after completing the buffering of the hanger roller 40 to release the hanger roller 40, ensuring that the hanger roller 40 can leave the lifting track 50 normally, and after the release is completed, the anti-return member 70 returns to the initial state to block and prevent the hanger roller 40 from retracting to the lifting track 50. The exit limit structure of the present application only relies on one anti-return member 70 to simultaneously solve the two problems of overshoot and retraction of the hanger roller 40 at the exit position of the lifting track 50.
[0052] Please combine Figure 4 and Figure 5As shown, in some embodiments, in the avoidance state, the length direction of the overshoot prevention rod 71 is between the positive X-axis direction and the positive Z-axis direction.
[0053] That is, the overshoot prevention rod 71 abuts against the part of the clothes hanger roller 40 in the second quadrant. Here, the second quadrant refers to the second quadrant of the XOZ coordinate system with the axis of the clothes hanger roller 40 as the origin.
[0054] With such a setting, after the lifting assembly 20 drives the clothes hanger roller 40 to lift until it abuts against the anti-backward movement member 70, the reaction force of the anti-backward movement member 70 on the clothes hanger roller 40 can be decomposed into a component force along the negative Z-axis direction and a component force along the positive X-axis direction. Among them, the component force along the negative Z-axis direction is used to block the continuous lifting of the clothes hanger roller 40, and the component force along the positive X-axis direction can drive the clothes hanger roller 40 to leave the lifting track 50 and enter the discharging track 60, so as to assist the clothes hanger roller 40 to leave the lifting track 50 through the anti-backward movement member 70.
[0055] Please refer to Figure 1 and Figure 2 As shown, in some embodiments, an elastic reset member 80 is further connected between the overshoot prevention rod 71 and the housing 10, which is used to drive the anti-backward movement member 70 to return to its initial state.
[0056] When the anti-backward movement member 70 is in the avoidance state, that is, when the clothes hanger roller 40 is lifted to correspond to the outlet position of the lifting track 50 in the X-axis direction, the anti-backward movement member 70 presses the clothes hanger roller 40 under the elastic action of the elastic reset member 80, and this pressing force is bound to have a component force along the positive X-axis direction to drive the clothes hanger roller 40 to smoothly disengage from the lifting track 50 along the positive X-axis direction, and can also play the role of assisting the clothes hanger roller 40 to leave the lifting track 50.
[0057] Specifically, the elastic reset member 80 is a torsion spring. One end of the torsion spring is connected to the rotating shaft 90, and the other end is connected to the housing 10.
[0058] Please refer to Figure 3 、 Figure 4 and Figure 5 As shown, in some embodiments, a first limit protrusion 711 and a second limit protrusion 712 are fixed on the overshoot prevention rod 71;
[0059] In the initial state, the first limit protrusion 711 abuts against the limit pin 11 to limit the anti-backward movement member 70 from rotating in the negative Z-axis direction, so as to prevent the situation that when the clothes hanger roller 40 swings back and presses the check rod 72, the anti-backward movement member 70 rotates in the negative Z-axis direction and causes the blocking failure, and increases the check safety;
[0060] In the avoidance state, the second limiting protrusion 712 abuts against the limiting pin 11 to limit the anti-backward rotation of the anti-backward member 70 in the positive Z-axis direction.
[0061] Please refer to Figure 1 and Figure 2 As shown, in some embodiments, an anti-backward member 70 is hinged on each side of the housing 10 in the Y-axis direction to increase the contact stability between the anti-backward member 70 and the hanger roller 40 and avoid the situation that the hanger roller 40 deflects in the Y-axis direction.
[0062] In some embodiments, a rotating shaft 90 is rotatably connected to the housing 10. The rotating shaft 90 penetrates the housing 10 in the Y-axis direction, and both anti-backward members 70 are fixed to the rotating shaft 90 so that the two anti-backward members 70 can rotate synchronously, further improving the contact stability between the anti-backward member 70 and the hanger roller 40 and avoiding the situation that the hanger roller 40 deflects due to uneven contact.
[0063] Please refer to Figure 6 As shown, in some embodiments, the anti-backward member 70 is fixed to one end of the discharge pipe 32 close to the lifting track 50; of course, in some other embodiments, the anti-backward member 70 can also be fixed to the housing 10 or other positions as long as the anti-backward member 70 at least partially protrudes from the discharge track 60 and can block the hanger roller 40 on the discharge track 60 from rolling in the negative X-axis direction to the lifting track 50.
[0064] The second aspect of the present application provides a hanging lifting arm, including the above anti-backward structure.
[0065] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.
[0066] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent should be subject to the appended claims.
Claims
1. An anti-backward structure, comprising a shell (10), a lifting assembly (20), a track tube (30) and a clothes hanger roller (40), wherein the track tube (30) comprises a lifting tube (31) and a discharge tube (32) fixed to the top of the lifting tube (31), a lifting track (50) is formed between the shell (10) and the lifting tube (31), and the upper side of the discharge tube (32) is a discharge track (60), and the lifting assembly (20) is arranged inside the shell (10) and is used to lift the clothes hanger roller (40) along the lifting track (50), characterized in that: The shell (10) and / or the track tube (30) are provided with an anti-rollback member (70) which at least partially protrudes from the discharge track (60); the anti-rollback member (70) is located at one end of the discharge track (60) close to the lifting track (50); the anti-rollback member (70) is used to prevent the hanger roller (40) on the discharge track (60) from rolling along the negative direction of the X-axis to the lifting track (50).
2. The anti-retraction structure according to claim 1, characterized in that: The anti-retraction member (70) is hinged to the housing (10), and a limit pin (11) is fixedly provided on the housing (10) for abutting against the anti-retraction member (70) so as to limit the anti-retraction member (70) between an initial state and an avoidance state; In the initial state, the anti-retraction member (70) blocks the discharge track (60) along the X-axis direction; in the avoidance state, an opening communicating with the discharge track (60) is formed between the anti-retraction member (70) and the discharge pipe (32).
3. The anti-retraction structure according to claim 2, characterized in that: The anti-retraction member (70) comprises an anti-overshoot rod (71) and a check rod (72), one end of the anti-overshoot rod (71) is hinged to the housing (10), and the check rod (72) is fixed to the other end of the anti-overshoot rod (71); In the initial state, the anti-overshoot rod (71) blocks the lifting track (50) along the Z-axis direction, and the non-return rod (72) blocks the discharge track (60) along the X-axis direction.
4. The anti-retraction structure according to claim 3, characterized in that: In the avoidance state, the length direction of the anti-overshoot rod (71) is located between the positive direction of the X-axis and the positive direction of the Z-axis.
5. The anti-retraction structure according to claim 4, characterized in that: An elastic reset member (80) is also connected between the anti-overshoot rod (71) and the housing (10) and is used to drive the anti-retraction member (70) to return to an initial state.
6. The anti-retraction structure according to claim 3, characterized in that: A first limiting protrusion (711) and a second limiting protrusion (712) are fixed on the anti-overshoot rod (71); In the initial state, the first limiting protrusion (711) abuts against the limiting pin (11) to limit the anti-retraction component (70) from rotating in the negative direction of the Z axis; In the avoidance state, the second limiting protrusion (712) abuts against the limiting pin (11) to limit the anti-retraction component (70) from rotating in the positive direction of the Z axis.
7. The anti-retraction structure according to any one of claims 2 to 6, characterized in that: One anti-retraction component (70) is hingedly connected to each of the two sides of the shell (10) along the Y-axis direction.
8. The anti-retraction structure according to claim 7, characterized in that: A rotating shaft (90) is rotatably connected to the shell (10), the rotating shaft (90) penetrates the shell (10) along the Y-axis direction, and the two anti-backward components (70) are both fixed to the rotating shaft (90).
9. The anti-retraction structure according to claim 1, characterized in that: The anti-retraction member (70) is fixed to one end of the discharge pipe (32) close to the lifting track (50).
10. A suspension lifting arm, characterized in that: It comprises the anti-retraction structure as claimed in any one of claims 1 to 9.