Automated guided vehicle, travel mechanism, and spring device
By integrating the spring device of tension adjustment seat and stroke adjustment parts on the unmanned transport vehicle, the maintenance difficulties caused by the complex structure of the existing transport vehicle are solved, and the effect of oscillation absorption and convenient inspection and maintenance of drive wheels is achieved.
Patent Information
- Application Number
- CN202421855325.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-08-02
AI Technical Summary
The existing transport trucks are complex in structure, resulting in difficulty in repair and stagnant development, lacking versatility.
An unmanned transport vehicle is designed, adopting a running mechanism including swing arm, drive wheel and spring device. Through the integration of the tension adjustment seat and stroke adjustment member, the lifting and vibration absorption of the drive wheel is achieved, simplifying the structure and easy maintenance.
Effectively absorb the oscillation of the traveling mechanism, maintain the operating level of the unmanned transport vehicle, simplify the maintenance process, and reduce the difficulty of maintenance.
Smart Images
Figure CN223131738U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a handling system, in particular to an automated guided vehicle, a traveling mechanism, and a spring device. Background Art
[0002] Existing handling vehicles usually only have a single function (such as shock absorption), and other components are additionally installed on the existing handling vehicles according to actual needs. This not only makes the structure of the existing handling vehicles gradually become complex and is not conducive to maintenance, but also causes the improvement of the existing handling vehicles to be ignored for a long time, resulting in stagnant development.
[0003] Therefore, the applicant believes that the above defects can be improved. After painstaking research and the application of scientific principles, the applicant finally proposes a utility model with reasonable design and effective improvement of the above defects. Summary of the Utility Model
[0004] An embodiment of the utility model provides an automated guided vehicle, a traveling mechanism, and a spring device, which can effectively improve the possible defects of existing handling vehicles.
[0005] An embodiment of the utility model discloses an automated guided vehicle, which includes: a chassis; and two traveling mechanisms respectively installed on opposite sides of the chassis, and each traveling mechanism includes: a swing arm having a configuration portion, a first pivot portion and a second pivot portion located on one side of the configuration portion; the first pivot portion is pivotally connected to the chassis; a drive wheel rotatably installed on the configuration portion for rolling on a ground; and a spring device including: a fixed seat pivotally connected to the chassis, and the fixed seat has a tension adjustment portion; a tension adjustment seat movably installed on the tension adjustment portion, and the tension adjustment seat has a through hole; a linkage shaft rod movably passing through the fixed seat, and the linkage shaft rod has a linkage end portion passing out of the fixed seat and an adjustment end portion passing out of the through hole; wherein the linkage end portion is pivotally connected to the second pivot portion of the swing arm; a stroke adjustment member movably installed on the adjustment end portion; and a spring disposed within the fixed seat and the tension adjustment seat, and two ends of the spring are respectively connected to the linkage shaft rod and the tension adjustment seat; wherein, in each traveling mechanism, the stroke adjustment member can move along the adjustment end portion and press against the tension adjustment seat to force the linkage shaft rod to move along a path passing out of the through hole, thereby driving the swing arm to rotate and lift the drive wheel.
[0006] Optionally, in each traveling mechanism, the length direction of the linkage shaft rod forms an arrangement angle between 10 degrees and 25 degrees with the horizontal plane of the chassis.
[0007] Optionally, within each of the traveling mechanisms, the spring device is pivotable within a range of 10 degrees about the pivot joint between the fixed seat and the chassis.
[0008] Optionally, within each of the traveling mechanisms, the first pivot portion is pivotally connected to the chassis along a first axis, the second pivot portion is pivotally connected to the linkage end portion along a second axis, the fixed seat is pivotally connected to the chassis along a third axis, and the height position of the third axis is between the height position of the first axis and the height position of the second axis.
[0009] Optionally, within each of the traveling mechanisms, the drive wheel is rotatably mounted on the configuration portion along a central axis, and the first pivot portion and the second pivot portion are arranged at an equal distance from the central axis.
[0010] Optionally, within each of the traveling mechanisms, the first pivot portion is pivotally connected to the chassis along a first axis, the second pivot portion is pivotally connected to the linkage end portion along a second axis, and the included angle formed by the first axis and the second axis with respect to the central axis is defined as a central angle, and the central angle is between 40 degrees and 50 degrees.
[0011] Optionally, within each of the traveling mechanisms, the tension adjustment portion has an external thread, the tension adjustment seat has an internal thread screwed onto the external thread, and the stroke adjustment member is screwed onto the adjustment end portion.
[0012] Optionally, the two traveling mechanisms are arranged in a mirror-symmetrical configuration with respect to the chassis.
[0013] An embodiment of the present utility model also discloses a traveling mechanism of an automated guided vehicle, which includes: a swing arm having a configuration portion, a first pivot portion and a second pivot portion located on one side of the configuration portion; the first pivot portion is pivotally connected to a chassis; a driving wheel rotatably mounted on the configuration portion for rolling on a ground; and a spring device including: a fixed seat pivotally connected to the chassis, and the fixed seat has a tension adjustment portion; a tension adjustment seat movably mounted on the tension adjustment portion, and the tension adjustment seat has a through hole; a linkage shaft rod movably passing through the fixed seat, and the linkage shaft rod has a linkage end portion passing out of the fixed seat and an adjustment end portion passing out of the through hole; wherein the linkage end portion is pivotally connected to the second pivot portion of the swing arm; a stroke adjustment member movably mounted on the adjustment end portion; and a spring disposed within the fixed seat and the tension adjustment seat, and two ends of the spring are respectively connected to the linkage shaft rod and the tension adjustment seat; wherein the stroke adjustment member can move along the adjustment end portion and press against the tension adjustment seat to force the linkage shaft rod to move along a path passing out of the through hole, thereby driving the swing arm to rotate and lift the driving wheel.
[0014] An embodiment of the present utility model further discloses a spring device of an automated guided vehicle, which includes: a fixed seat pivotally connected to a chassis, and the fixed seat has a tension adjustment portion; a tension adjustment seat movably mounted on the tension adjustment portion, and the tension adjustment seat has a through hole; a linkage shaft rod movably passing through the fixed seat, and the linkage shaft rod has a linkage end portion passing out of the fixed seat and an adjustment end portion passing out of the through hole; a stroke adjustment member movably mounted on the adjustment end portion; and a spring disposed within the fixed seat and the tension adjustment seat, and two ends of the spring are respectively connected to the linkage shaft rod and the tension adjustment seat; wherein the stroke adjustment member can move along the adjustment end portion and press against the tension adjustment seat to force the linkage shaft rod to move along a path passing out of the through hole.
[0015] In summary, the automated guided vehicle disclosed in the embodiment of the present utility model can be linked to the swing arm and the driving wheel through the integration of the "tension adjustment seat" and the "stroke adjustment member" in the spring device with other components in the spring device, so that the spring device can effectively absorb the shock generated when the traveling mechanism moves, thereby maintaining the level of the operation of the automated guided vehicle. Furthermore, through this integrated design, the spring device can also lift the driving wheel at any time for convenient inspection or maintenance, not only simplifying the complex structure of the past transport vehicle, but also avoiding the difficult maintenance situation caused by the complex structure of the past transport vehicle.
[0016] To further understand the features and technical content of the present utility model, please refer to the following detailed description and accompanying drawings of the present utility model. However, these descriptions and drawings are only used to illustrate the present utility model and do not impose any limitation on the scope of protection of the present utility model. Description of the Drawings
[0017] Figure 1 It is a three-dimensional schematic diagram of the automatic guided vehicle according to an embodiment of the present utility model.
[0018] Figure 2 It is a three-dimensional schematic diagram of the traveling mechanism moving on the ground according to an embodiment of the present utility model.
[0019] Figure 3 For Figure 2 planar schematic diagram.
[0020] Figure 4 For Figure 2 a cross-sectional schematic diagram of the spring device along the section line IV-IV.
[0021] Figure 5 For Figure 3 a planar schematic diagram of the traveling mechanism moving on a raised portion of the ground.
[0022] Figure 6 For Figure 4 a cross-sectional schematic diagram of the tension adjustment seat locking the tension adjustment part.
[0023] Figure 7 For Figure 4 a cross-sectional schematic diagram of the tension adjustment seat releasing the tension adjustment part.
[0024] Figure 8 For Figure 4 a cross-sectional schematic diagram of the stroke adjustment member locking the adjustment end portion and pressing against the tension adjustment seat.
[0025] Figure 9 For Figure 3 a planar schematic diagram of the stroke adjustment member locking the adjustment end portion to lift the driving wheel. Detailed Embodiment
[0026] The following is to illustrate the implementation mode of the present utility model related to "automatic guided vehicle, traveling mechanism, and spring device" through specific specific embodiments. Those skilled in the art can understand the advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present utility model. In addition, the drawings of the present utility model are only for simple schematic illustration and are not drawn according to actual dimensions. The following implementation mode will further detail the related technical content of the present utility model, but the disclosed content is not used to limit the protection scope of the present utility model.
[0027] It should be understood that although terms such as "first", "second", "third", etc. may be used in this article to describe various components or features, these components or features should not be limited by these terms. These terms are mainly used to distinguish one component from another, or one feature from another. In addition, the term "or" used in this article should, depending on the actual situation, possibly include any one or a combination of more of the associated listed items.
[0028] Please refer to Figures 1 to 9 as shown, which is an embodiment of the present utility model. As Figure 1 and Figure 2 shown, this embodiment discloses an automatic guided vehicle 1000, which can be applied to an automated operating system. Among them, the automatic guided vehicle 1000 includes a chassis 200, two traveling mechanisms 100 respectively installed on opposite sides of the chassis 200, a mast module 400 installed on the chassis 200, and a cargo holding module 300 installed on the mast module 400, but the present utility model is not limited thereto. For example, in other embodiments not shown in the present utility model, the cargo holding module 300 and / or the mast module 400 can be omitted or replaced by other components according to actual needs.
[0029] In addition, although the above two traveling mechanisms 100, chassis 200, cargo holding module 300, and mast module 400 are jointly defined as the automatic guided vehicle 1000 in this embodiment, the present utility model is not limited thereto. For example, in other embodiments not shown in the present utility model, each traveling mechanism 100 can also be used alone (such as: implemented, manufactured, sold, etc.) or used in combination with other components.
[0030] In this embodiment, the chassis 200 includes a plate body 201 and a plurality of auxiliary wheels 202 mounted on the bottom side of the plate body 201. Among them, each side of the plate body 201 has a first bracket 203 and two second brackets 204, and each side of the plate body 201 has a wheel hole 205. Further, each traveling mechanism 100 is mounted on one of the first brackets 203 and two of the second brackets 204, and preferably each traveling mechanism 100 is located between the two auxiliary wheels 202 and partially passes through the wheel hole 205 of the plate body 201, so that the two traveling mechanisms 100 and the plurality of auxiliary wheels 202 can be jointly disposed on a ground G.
[0031] More specifically, since the two traveling mechanisms 100 in this embodiment adopt substantially the same structure and are arranged in a mirror-symmetrical configuration with respect to the chassis 200, for the sake of easy understanding, the following mainly introduces the structure and connection relationship of one of the traveling mechanisms 100, but the present invention is not limited thereto. For example, in other embodiments not shown in the present invention, the structures of the two traveling mechanisms 100 may also be slightly different or not in a mirror-symmetrical configuration.
[0032] As Figures 1 to 3 shown, the traveling mechanism 100 in this embodiment includes a swing arm 1, a driving wheel 2 mounted on the swing arm 1, and a spring device 3 pivotally connected to the swing arm 1, but the present invention is not limited thereto. For example, in other embodiments not shown in the present invention, the spring device 3 may also be used alone (such as: implemented, manufactured, sold, etc.) or used in combination with other components.
[0033] Among them, the swing arm 1 has a configuration portion 11, and a first pivot portion 12 and a second pivot portion 13 located on one side of the configuration portion 11. It should be noted first that the driving wheel 2 is rotatably mounted on the configuration portion 11 along a central axis S4, and the driving wheel 2 is used to roll on the ground G, so that the automated guided vehicle 1000 can move to any position through the traveling mechanism 100.
[0034] Further, the first pivot portion 12 is pivotally connected to the chassis 200, and the first pivot portion 12 and the chassis 200 are pivotally connected to each other along a first axis S1. More specifically, the first pivot portion 12 is pivotally connected to one of the first brackets 203, and the swing arm 1 can rotate relative to the chassis 200 with the first pivot portion 12 as the center, so that the configuration portion 11 and the driving wheel 2 can also rotate with the first pivot portion 12 as the center.
[0035] Furthermore, the second pivoting portion 13 is pivotally connected to the spring device 3, and the second pivoting portion 13 and the spring device 3 are pivotally connected to each other along a second axis S2. Specifically, referring back to Figure 3 as shown, the first pivoting portion 12 and the second pivoting portion 13 are arranged at an equal distance from the central axis S4, and the included angle formed by the first axis S1 and the second axis S2 with respect to the central axis S4 is further defined as a central angle σ1, which is preferably between 40 degrees and 50 degrees, but is not limited thereto.
[0036] Please also refer to Figures 2 to 4 as shown, the spring device 3 includes a fixed seat 31 pivotally connected to the chassis 200, a tension adjustment seat 32 movably mounted on the fixed seat 31, a linkage rod 33 movably passing through the fixed seat 31, a stroke adjustment member 34 movably mounted on the linkage rod 33, and a spring 35 disposed within the fixed seat 31 and the tension adjustment seat 32.
[0037] Furthermore, the fixed seat 31 and the chassis 200 are pivotally connected to each other along a third axis S3, and the fixed seat 31 is pivotally connected to two of the second brackets 204. More specifically, the height position of the third axis S3 is preferably between the height position of the first axis S1 and the height position of the second axis S2.
[0038] Among them, the fixed seat 31 is generally tubular and has a tension adjustment portion 311, and the tension adjustment portion 311 is located away from the pivot connection between the fixed seat 31 and the second bracket 204. More specifically, the tension adjustment seat 32 is movably mounted on the tension adjustment portion 311, and the tension adjustment seat 32 has a through hole 321. Among them, the through hole 321 can communicate with the interior space of the tension adjustment portion 311.
[0039] Specifically, the tension adjustment portion 311 has an external thread in this embodiment, and the tension adjustment seat 32 has an internal thread screwed onto the external thread, so that the tension adjustment seat 32 can be used to lock or loosen the tension adjustment portion 311 according to actual needs. However, the installation method of the tension adjustment seat 32 and the tension adjustment portion 311 can be adjusted and changed according to actual needs, and the present utility model does not limit this here.
[0040] Furthermore, the linkage shaft rod 33 is movably disposed through the fixed seat 31 and the tension adjustment seat 32, and the linkage shaft rod 33 further passes through the spring 35 so that two ends of the spring 35 are respectively connected to the tension adjustment seat 32 and the linkage shaft rod 33. It should be additionally noted that a configuration angle σ2, preferably between 10 degrees and 25 degrees, is formed between the length direction of the linkage shaft rod 33 and the horizontal plane of the chassis 200, but the present invention is not limited thereto. For example, in other embodiments not shown in the present invention, the configuration angle σ2 may also be between 13 degrees and 23 degrees.
[0041] Wherein, the linkage shaft rod 33 has a linkage end 331, an adjustment end 332 away from the linkage end 331, and an abutting portion 333 located between the linkage end 331 and the adjustment end 332. Further, the linkage end 331 passes through the fixed seat 31 (that is, the end away from the tension adjustment portion 311) and is pivotally connected to the second pivot portion 13, and the linkage end 331 and the second pivot portion 13 are pivotally connected to each other along the second axis S2.
[0042] Furthermore, the adjustment end 332 passes through the tension adjustment portion 311 and the through hole 321, and the stroke adjustment member 34 is movably mounted on the adjustment end 332. Further, the adjustment end 332 can generate an external thread in this embodiment, and the stroke adjustment member 34 has an internal thread screwed onto the external thread of the adjustment end 332 so that the stroke adjustment member 34 can be screwed onto the adjustment end 332.
[0043] More specifically, the abutting portion 333 is located within the fixed seat 31 and presses against the spring 35 so that two ends of the spring 35 are pressed and limited between the abutting portion 333 and the tension adjustment seat 32. Specifically, as Figures 3 to 5 shown, when the driving wheel 2 of the traveling mechanism 100 moves from the ground G to a raised portion G1, the driving wheel 2 can cause the swing arm 1 to rotate about the first pivot portion 12 (or the first axis S1), so that the second pivot portion 13 drives the linkage shaft rod 33 to move through the linkage end 331, and further causes the spring 35 to deform under the pressure between the abutting portion 333 and the tension adjustment seat 32. Thus, the traveling mechanism 100 can buffer the possible shock when the driving wheel 2 moves from the ground G to the raised portion G1 through the spring 35, thereby maintaining the levelness of the automated guided vehicle 1000 during operation.
[0044] It is worth mentioning that when the stroke adjuster 34 is screwed to the adjustment end 332, the stroke adjuster 34 can reserve a distance from the tension adjustment seat 32 to ensure that the linkage shaft rod 33 has enough space to move freely within this distance and drive various components, and further prevent the linkage shaft rod 33 from detaching from the fixed seat 31.
[0045] In addition, as Figure 6 and Figure 7 shown, the traveling mechanism 100 can also adjust the tension adjustment seat 32 to be locked (as Figure 6 shown) or loosened (as Figure 7 shown) according to actual needs (such as when the automated guided vehicle 1000 is carrying goods of different weights), to change (such as compress or relax) the deformation amount generated by the spring 35, so that the spring 35 can absorb or release the possible vibrations generated when the traveling mechanism 100 moves with different deformation amounts, thereby maintaining the stability of the automated guided vehicle 1000 during operation.
[0046] Furthermore, as Figure 3 、 Figure 4 、 Figure 8 and Figure 9 shown, the traveling mechanism 100 can screw the stroke adjuster 34 to the adjustment end 332 and press against the tension adjustment seat 32 to force the linkage shaft rod 33 to move along the path passing through the through hole 321, so that the linkage end 331 drives the second pivot portion 13, and then the configuration portion 11 can rotate around the first pivot portion 12 (or the second axis S2), thereby driving the swing arm 1 to rotate and lift the drive wheel 2.
[0047] As described above, the traveling mechanism 100 can also selectively lift the drive wheel 2 through the cooperation of the stroke adjuster 34 and other components, so that the automated guided vehicle 1000 can inspect the condition of the drive wheel 2 at any time during operation, and reduce the difficulty of repairing the drive wheel 2. It should be additionally noted that when the drive wheel 2 is lifted, the automated guided vehicle 1000 can be supported on the ground G by the auxiliary wheel 202.
[0048] In addition, the spring 35 can be used to buffer the shock generated when the stroke adjusting member 34 presses against the tension adjusting seat 32 and is linked to the linkage shaft 33, thereby avoiding damage to the spring device 3. Further, the spring device 3 can swing within a range of 10 degrees with the pivot joint between the fixed seat 31 and the chassis 200 (that is, the two second brackets 204) as the axis to buffer the shock generated when the components in the traveling mechanism 100 are linked, thereby effectively avoiding damage to the traveling mechanism 100.
[0049] [Technical effects of the embodiments of the present utility model]
[0050] In summary, the automated guided vehicle disclosed in the embodiments of the present utility model can be linked to the swing arm and the drive wheels through the integration of the "tension adjusting seat" and the "stroke adjusting member" in the spring device with other components in the spring device, so that the spring device can effectively absorb the shock generated when the traveling mechanism moves, and further maintain the level of operation of the automated guided vehicle. Moreover, through this integrated design, the spring device can also lift the drive wheels at any time for convenient inspection or maintenance, not only simplifying the complex structure of the past forklift truck, but also avoiding the difficult maintenance situation caused by the complex structure of the past forklift truck.
[0051] The content disclosed above is only the optional and feasible embodiments of the present utility model, and does not limit the patent scope of the present utility model. Therefore, all equivalent technical changes made by using the content of the specification and drawings of the present utility model are included in the patent scope of the present utility model.
Claims
1. An automated guided vehicle, characterized in that, The unmanned carrier vehicle includes: a chassis; and two traveling mechanisms respectively installed on opposite sides of the chassis, and each of the traveling mechanisms includes: a swing arm having a configuration portion, a first pivot portion and a second pivot portion located on one side of the configuration portion; the first pivot portion is pivotally connected to the chassis; a driving wheel rotatably installed on the configuration portion for rolling on a ground; and a spring device including: a fixed seat pivotally connected to the chassis, and the fixed seat has a tension adjustment portion; a tension adjustment seat movably installed on the tension adjustment portion, and the tension adjustment seat has a through hole; a linkage shaft rod movably passing through the fixed seat, and the linkage shaft rod has a linkage end portion passing out of the fixed seat and an adjustment end portion passing out of the through hole; wherein, the linkage end portion is pivotally connected to the second pivot portion of the swing arm; a stroke adjustment member movably installed on the adjustment end portion; and a spring disposed within the fixed seat and the tension adjustment seat, and two ends of the spring are respectively connected to the linkage shaft rod and the tension adjustment seat; wherein, in each of the traveling mechanisms, the stroke adjustment member can move along the adjustment end portion and press against the tension adjustment seat to force the linkage shaft rod to move along a path passing out of the through hole, thereby driving the swing arm to rotate and lift the driving wheel.
2. The automated guided vehicle according to claim 1, wherein, In each of the traveling mechanisms, the length direction of the linkage shaft rod forms an arrangement angle between 10 degrees and 25 degrees with the horizontal plane of the chassis.
3. The automatic guided vehicle according to claim 1, characterized in that, In each of the traveling mechanisms, the spring device can swing within a range of 10 degrees with the pivot joint between the fixed seat and the chassis as the axis.
4. The automated guided vehicle according to claim 1, wherein, In each of the traveling mechanisms, the first pivot portion and the chassis are pivotally connected to each other along a first axis, the second pivot portion and the linkage end portion are pivotally connected to each other along a second axis, the fixed seat and the chassis are pivotally connected to each other along a third axis, and the height position of the third axis is between the height position of the first axis and the height position of the second axis.
5. The automated guided vehicle according to claim 1, wherein, In each of the traveling mechanisms, the driving wheel is rotatably installed on the configuration portion along a central axis, and the first pivot portion and the second pivot portion are arranged at an equal distance from the central axis.
6. The automatic guided vehicle according to claim 5, wherein, In each of the traveling mechanisms, the first pivot portion and the chassis are pivotally connected to each other along a first axis, the second pivot portion and the linkage end portion are pivotally connected to each other along a second axis, and an included angle formed by the first axis and the second axis with respect to the central axis is defined as a central angle, and the central angle is between 40 degrees and 50 degrees.
7. The automated guided vehicle according to claim 1, characterized in that, In each of the traveling mechanisms, the tension adjustment portion has an external thread, the tension adjustment seat has an internal thread screwed onto the external thread, and the stroke adjustment member is screwed onto the adjustment end portion.
8. The automated guided vehicle according to claim 1, wherein, The two traveling mechanisms are arranged in a mirror symmetry with respect to the chassis.
9. The running mechanism of an automated guided vehicle, characterized in that, The traveling mechanism includes: An oscillating arm, having a configuration portion, a first pivot portion and a second pivot portion located on one side of the configuration portion; the first pivot portion is pivotally connected to a chassis; A driving wheel, rotatably mounted on the configuration portion for rolling on a ground; and A spring device, comprising: A fixed seat, pivotally connected to the chassis, and the fixed seat has a tension adjustment portion; A tension adjustment seat, movably mounted on the tension adjustment portion, and the tension adjustment seat has a perforation; A linkage shaft rod, movably passing through the fixed seat, and the linkage shaft rod has a linkage end portion passing out of the fixed seat and an adjustment end portion passing out of the perforation; wherein, the linkage end portion is pivotally connected to the second pivot portion of the oscillating arm; A stroke adjustment member, movably mounted on the adjustment end portion; and A spring, disposed within the fixed seat and the tension adjustment seat, and two ends of the spring are respectively connected to the linkage shaft rod and the tension adjustment seat; Wherein, the stroke adjustment member can move along the adjustment end portion and press against the tension adjustment seat to force the linkage shaft rod to move along a path passing out of the perforation, thereby driving the oscillating arm to rotate and lift the driving wheel.
10. A spring device for an automated guided vehicle, characterized in that The spring device includes: A fixed seat, pivotally connected to a chassis, and the fixed seat has a tension adjustment portion; A tension adjustment seat, movably mounted on the tension adjustment portion, and the tension adjustment seat has a perforation; A linkage shaft rod, movably passing through the fixed seat, and the linkage shaft rod has a linkage end portion passing out of the fixed seat and an adjustment end portion passing out of the perforation; A stroke adjustment member, movably mounted on the adjustment end portion; and A spring, disposed within the fixed seat and the tension adjustment seat, and two ends of the spring are respectively connected to the linkage shaft rod and the tension adjustment seat; Wherein, the stroke adjustment member can move along the adjustment end portion and press against the tension adjustment seat to force the linkage shaft rod to move along a path passing out of the perforation.