Spring pull rod and spring module

Abstract

The utility model provides a spring pull rod and a spring module, the spring pull rod comprises a pull rod body, and a plurality of first reinforcing parts and a plurality of second reinforcing parts which are arranged on the pull rod body; all the first reinforcing parts are arranged in the axial direction of the pull rod, all the first reinforcing parts and all the second reinforcing parts are arranged in a staggered mode in the circumferential direction of the pull rod, and in the circumferential direction of the pull rod, the width H1 of all the first reinforcing parts and the width H2 of all the second reinforcing parts meet the condition that H1 is larger than H2. According to the spring pull rod, stress distribution can be changed when the spring pull rod is stressed, the structure and the tensile strength of the spring pull rod are enhanced, the problem of fatigue fracture of the spring pull rod is well avoided, and a spring module and even a whole pneumatic actuating mechanism have longer service life and good product quality.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pneumatic actuator, especially relates to a spring pull rod, and the utility model relates to a spring module provided with the spring pull rod. BACKGROUND

[0002] In the fork type pneumatic actuator, the spring module usually exists as a reset element. When the pneumatic actuator loses the gas source, the spring can generate a restoring force, and through the pull rod or the spring module, the actuator (such as a valve) is returned to the closed position or the initial position, thereby preventing medium leakage or maintaining the stability of the system. This reset function is particularly critical in single-acting pneumatic actuators, as it allows the actuator to automatically reset to the preset state when the gas source is lost.

[0003] Moreover, in the design of the fork type pneumatic actuator, the spring module and its internal spring pull rod usually cooperate with the fork, cylinder and other components to jointly realize the opening and closing action and reset function of the actuator. Their role not only ensures the reliability and stability of the actuator, but also improves the operating efficiency and safety of the entire system. However, the structure and tensile strength of the existing spring pull rod are insufficient, and there is a risk of breakage, which is not conducive to the improvement of the product quality of the pneumatic actuator. SUMMARY

[0004] Therefore, the utility model aims at providing a spring pull rod with good structural strength.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] A spring pull rod, comprising a pull rod body, and a plurality of first reinforcing portions and a plurality of second reinforcing portions provided on the pull rod body.

[0007] Each of the first reinforcing portions is arranged along the axial direction of the pull rod, each of the first reinforcing portions and each of the second reinforcing portions are arranged staggered along the circumferential direction of the pull rod, and along the circumferential direction of the pull rod, the width H1 of each of the first reinforcing portions and the width H2 of each of the second reinforcing portions satisfy the relationship: H1 > H2.

[0008] Further, along the circumferential direction of the pull rod, the width H1 of each of the first reinforcing portions and the width H2 of each of the second reinforcing portions satisfy the relationship: 2H2 ≤ H1 ≤ 3H2.

[0009] Further, each of the first reinforcing portions is a protruding rib provided on the pull rod body and protruding radially along the pull rod body, and / or each of the second reinforcing portions is a groove provided on the pull rod body and arranged axially along the pull rod body.

[0010] Further, the grooves are multiple and arranged axially along the rod body.

[0011] Further, the distance S between each groove and the length L of each groove satisfy S≥0.2L.

[0012] Further, the height h1 of each rib along the radial direction of the rod body and the depth h2 of each groove along the radial direction of the rod body satisfy h1:h2=1:(1-2).

[0013] Further, the two ends of the length direction of each rib are provided with inclined surfaces β, and the included angle α between each inclined surface β and the outer peripheral wall of the rod body is ≥120°.

[0014] Further, the two ends of the length direction of each groove are both smoothly connected with the outer peripheral wall of the rod body.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The spring rod disclosed by the utility model is provided with multiple first reinforcing parts and multiple second reinforcing parts staggered along the circumferential direction of the rod, the width H1 of each first reinforcing part and the width H2 of each second reinforcing part satisfy H1>H2, the stress distribution of the spring rod under stress can be changed, the structure and tensile strength are enhanced, and the problem of fatigue fracture can be well avoided, so that the spring module and even the whole pneumatic actuator have a longer service life and good product quality.

[0017] In addition, along the circumferential direction of the rod, the width H1 of each first reinforcing part and the width H2 of each second reinforcing part satisfy 2H2≤H1≤3H2, the stress distribution of the spring rod under stress can be further improved, the tensile strength and service life of the spring rod are enhanced, each first reinforcing part is a rib arranged on the rod body and protruding along the radial direction of the rod body, meanwhile, each second reinforcing part is a groove arranged on the rod body along the axial direction of the rod body, so that the spring rod can have high structure and tensile strength and also realize lightweight design.

[0018] In addition, the grooves are multiple and arranged axially along the rod body, that is, multiple grooves are arranged on both sides of each rib, which is beneficial to further improve the stress distribution of the spring rod under stress, the distance S between each groove and the length L of each groove satisfy S≥0.2L, so that the length of each groove is not too long and the structural strength of the spring rod is not affected, the height h1 of each rib along the radial direction of the rod body and the depth h2 of each groove along the radial direction of the rod body satisfy h1:h2=1:(1-2), which is beneficial to optimize the stress distribution of the spring rod and realize lightweight design of the spring rod.

[0019] In addition, the length direction of each convex rib is provided with an inclined surface beta, and the included angle alpha between each inclined surface beta and the outer peripheral wall of the pull rod body is greater than or equal to 120 degrees, so that the tensile stress is avoided to be concentrated at the end of each convex rib, and the tensile strength of the spring pull rod is damaged. Similarly, the length direction of each groove is smoothly connected with the outer peripheral wall of the pull rod body, which is also beneficial to avoid the tensile stress concentrated at the end of each convex rib, and further improve the tensile strength of the spring pull rod.

[0020] Another purpose of the utility model lies in providing a spring module, which comprises a cylindrical cylinder body, a first end cover and a second end cover respectively arranged at two open ends of the cylinder body, and a spring pull rod as described above slidingly arranged on the first end cover;

[0021] The spring pull rod and the cylinder body are coaxially arranged, and one end of the spring pull rod protruding from the first end cover is used for being connected with a sliding block in a driving module.

[0022] Further, a spring seat connected with the pull rod body is arranged in the cylinder body, and a first spring and a second spring are arranged between the first end cover and the spring seat, and the second spring is located in the first spring; the elastic coefficient k1 of the first spring and the elastic coefficient k2 of the second spring satisfy: k2 / k1 is between 0.5 and 0.8.

[0023] The spring module described in the utility model is provided with the spring pull rod described above, has the same beneficial effects compared with the traditional technology, and will not be described here.

[0024] Secondly, the second spring is arranged, a redundant design for protecting the spring module is formed, the risk that the spring module and even the whole pneumatic actuating mechanism or executed equipment is damaged due to the overload damage failure of the first spring is avoided, and the reliability of the spring module and the pneumatic actuating mechanism is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings that form a part of the present utility model are used to provide a further understanding of the present utility model, and the illustrative embodiments of the present utility model and the description thereof are used to explain the present utility model, and do not constitute an improper limitation on the present utility model. In the drawings:

[0026] Figure 1 The structure schematic view of the pneumatic actuating mechanism described in the embodiments of the present utility model is shown in the figure;

[0027] Figure 2 The internal structure schematic view of the structure shown in the figure; Figure 1

[0028] Figure 3 The structure schematic view of the spring pull rod, the second spring and the spring seat during assembly is shown in the figure; ​

[0029] Figure 4 A structure schematic view of the spring pull rod according to the embodiment of the utility model;

[0030] Figure 5 A structure schematic view of the cross section of the structure shown in the figure; Figure 4 A structure schematic view of the structure shown in the figure from another perspective;

[0031] Figure 6 A structure schematic view of the spring seat according to the embodiment of the utility model; Figure 4 A structure schematic view of the structure shown in the figure from another perspective;

[0032] Figure 7 A structure schematic view of the spring seat according to the embodiment of the utility model;

[0033] Figure 8 A structure schematic view of the fork assembly according to the embodiment of the utility model;

[0034] Mark explanation:

[0035] 1, cylinder module; 11, cylinder main body; 12, piston; 121, piston rod; 13, guide rod;

[0036] 2, drive module; 21, box body; 211, connecting flange; 2111, stop hole; 2112, weight reduction hole; 22, fork; 221, fork shaft; 2211, key groove; 222, driving plate; 2221, sliding groove; 223, connecting hole; 23, driving piece; 231, sliding rod; 24, guide rod;

[0037] 3, spring module; 31, cylinder body; 32, first end cover; 33, second end cover; 34, pull rod body; 341, convex rib; 342, groove; 35, spring seat; 351, first mounting table; 352, second mounting table; 36, first spring; 37, second spring. Specific implementation

[0038] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0039] In the following description, specific details are set forth in order to provide a thorough understanding of embodiments of the application. However, persons having ordinary skill in the art will appreciate that embodiments of the application can be practiced without the specific details, and that the application is not limited to the specific details.

[0040] In the description of the utility model, it is necessary to explain that if the terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship appear, it is based on the orientation or positional relationship shown in the drawing, and it is only for the convenience of describing the utility model and simplifying the description, and therefore it cannot be understood as limiting the utility model to having a specific orientation, being constructed and operated in a specific orientation, and therefore it cannot be understood as limiting the utility model. In addition, if the terms such as "first", "second" and the like appear, they are also only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0041] In addition, in the description of the utility model, unless otherwise explicitly limited, the terms "mounting", "connection", "connection" and "connector" should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected. It can be mechanically connected, or it can be electrically connected. It can be directly connected, or it can be indirectly connected through an intermediate medium. It can be the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood in combination with the specific circumstances.

[0042] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0043] Embodiment one

[0044] This embodiment relates to a spring pull rod, and the overall structure is as shown in Figures 4 to 6 It comprises a pull rod body 34, and a plurality of first reinforcing portions and a plurality of second reinforcing portions arranged on the pull rod body 34. And each first reinforcing portion is arranged along the axial direction of the pull rod, each first reinforcing portion and each second reinforcing portion are staggered along the circumferential direction of the pull rod, and along the circumferential direction of the pull rod, the width H1 of each first reinforcing portion and the width H2 of each second reinforcing portion satisfy: H1>H2.

[0045] At this time, as set forth above, by arranging a plurality of first reinforcing portions and a plurality of second reinforcing portions staggered along the circumferential direction of the pull rod, and the width H1 of each first reinforcing portion and the width H2 of each second reinforcing portion satisfy: H1>H2, the stress distribution when the spring pull rod is stressed is changed, the structure and the tensile strength are enhanced, and the problem of fatigue fracture of the spring pull rod is well avoided, so that the spring module 3 and even the entire pneumatic actuator have a longer service life and good product quality.

[0046] Based on the above overall introduction, in detail, in the embodiment, in the specific implementation, in combination Figure 1 And Figure 2As shown, the spring pull rod is an important component of the spring module 3 of the pneumatic actuator, which is mainly used to generate a restoring force when the pneumatic actuator loses the gas source, so that the actuator (such as a valve) can be pulled back to the closed position or the initial position through the pull rod, thereby preventing medium leakage or maintaining the stability of the system.

[0047] In this embodiment, as a preferred implementation form, as shown in Figure 5 As shown, along the circumference of the pull rod, the width H1 of each first reinforcing part and the width H2 of each second reinforcing part satisfy: 2H2≤H1≤3H2, and for example, H1=2H2, H1=2.5H2, or H1=3H2, etc. In this way, the stress distribution of the spring pull rod under stress can be further improved, and the tensile strength and service life of the spring pull rod can be strengthened.

[0048] In addition, as a preferred implementation form, in combination with Figure 3 and Figure 4 As shown in the embodiment, each first reinforcing part is a protruding rib 341 provided on the pull rod body 34 and protruding radially along the pull rod body 34, and each second reinforcing part is a groove 342 provided on the pull rod body 34 and arranged axially along the pull rod body 34. In this way, the spring pull rod can have high structural and tensile strength, and can also achieve lightweight design.

[0049] Of course, in this embodiment, in addition to setting the first reinforcing part as the rib 341 and the second reinforcing part as the groove 342, the first reinforcing part and the second reinforcing part can also be set as ribs 341 according to the structural and tensile strength requirements of the spring pull rod, or only the first protruding part is set as a rib 341, or only the second reinforcing part is set as a rib 341, etc.

[0050] Considering the structural strength requirements of the spring pull rod, in this embodiment, as a preferred implementation form, the grooves 342 are arranged axially in multiple sections, that is, each rib 341 has multiple grooves 342 on both sides, which is beneficial to further improve the stress distribution of the spring pull rod under stress.

[0051] Moreover, as a preferred implementation form, in this embodiment, the distance S between each groove 342 and the length L of each groove 342 satisfy: S≥0.2L, and for example, S=0.2L, S=0.3L, or S=0.5L. In this way, the length of each groove 342 is prevented from being too long to affect the structural strength of the spring pull rod.

[0052] In addition, in this embodiment, as a preferred implementation form, as shown in Figure 5As shown, the height h1 of each protrusion 341 along the radial direction of the pull rod body 34 and the depth h2 of each groove 342 along the radial direction of the pull rod body 34 satisfy the relationship h1:h2=1:(1-2), and may specifically be h1=h2, h1=1.5h2, or h1=2h2, etc. In this way, the stress distribution of the spring pull rod can be optimized, and the lightweight design of the spring pull rod can be achieved.

[0053] In addition, as a preferred implementation form, in the present embodiment, the spring pull rod in the present embodiment continues to refer to the spring pull rod as shown in Figure 6 As shown, the two ends of each protrusion 341 in the length direction are provided with inclined surfaces β, and the included angle α between each inclined surface β and the outer peripheral wall of the pull rod body 34 is ≥120°, so as to avoid the concentration of tensile stress at the ends of each protrusion 341 and damage the tensile strength of the spring pull rod.

[0054] At the same time, as a preferred implementation form in the present embodiment, the two ends of each groove 342 in the length direction are smoothly transitioned with the outer peripheral wall of the pull rod body 34, so as to also help avoid the concentration of tensile stress at the ends of each protrusion 341, and further improve the tensile strength of the spring pull rod.

[0055] Specifically, the above-mentioned included angle α may specifically be 120° or 150°, so as to eliminate the stress concentration at the circumferential edge of each protrusion 341 and the connection with the pull rod body 34 as much as possible. At the same time, in order to reduce the stress concentration between each protrusion 341 and the pull rod body 34, and between each groove 342 and the pull rod body 34, the above-mentioned inclined surfaces β are preferably provided between the two sides of each protrusion 341 and the outer peripheral wall of the pull rod body 34 along the circumferential direction of the pull rod body 34, and the two sides of each groove 342 and the outer peripheral wall of the pull rod body 34 are also preferably smoothly transitioned.

[0056] The spring pull rod of the present embodiment can change the stress distribution when the spring pull rod is stressed, enhance the structure and tensile strength, and further effectively avoid the problem of fatigue fracture, so that the spring module 3 and even the entire pneumatic actuator have a longer service life and good product quality.

[0057] Embodiment Two

[0058] The present embodiment relates to a spring module 3, which combines Figure 1 and Figure 2 As shown, it includes a cylindrical cylinder body 31, a first end cover 32 and a second end cover 33 respectively arranged at the two open ends of the cylinder body 31, and the spring pull rod in Embodiment One slidingly arranged on the first end cover 32. At the same time, the spring pull rod and the cylinder body 31 are coaxially arranged, and one end of the spring pull rod protruding out of the first end cover 32 is used to connect with the slider (i.e. the driving member 23 described below) in the driving module 2.

[0059] The spring module of the embodiment and the spring pull rod in the first embodiment have the same beneficial effects as the prior art, which will not be described here.

[0060] In addition, as a preferred implementation form, in combination with Figure 3 As shown in the drawings, the spring module 3 of the embodiment further comprises a spring seat 35 provided in the cylinder body 31 and connected with the pull rod body 34, and a first spring 36 and a second spring 37 provided between the first end cover 32 and the spring seat 35, and the second spring 37 is located in the first spring 36. Moreover, the elastic coefficient k1 of the first spring 36 and the elastic coefficient k2 of the second spring 37 satisfy: k2 / k1 is between 0.5-0.8.

[0061] It can be understood that by providing the second spring 37 and the elastic coefficient k1 of the first spring 36 and the elastic coefficient k2 of the second spring 37 satisfy: k2 / k1 is between 0.5-0.8, the second spring 37 can assist the first spring 36 to complete the reset operation when the pneumatic actuator loses the gas source, and a redundant design is formed to protect the spring module 3, avoiding the risk of damage to the spring module 3, and even the entire pneumatic actuator or the executed device when the first spring 36 is overloaded and damaged, and improving the reliability of the spring module 3 and the pneumatic actuator.

[0062] In specific implementation, the ratio of the elastic coefficient k2 and the elastic coefficient k1 can be 0.5, 0.6 or 0.8, so as to assist the first spring 36 to reset and avoid damage to the surrounding environment components when the first spring 36 fails. At the same time, in order to facilitate the installation of the first spring 36 and the second spring 37, the spring seat 35 is provided with a first mounting table 351 and a second mounting table 352 for mounting the two springs, respectively. The two ends of the first spring 36 can be respectively abutted against the first end cover 32 and the first mounting table 351, and the second spring 37 can be fixedly connected to the second mounting table 352.

[0063] Moreover, it is worth mentioning that the spring module 3 is an important component in the pneumatic actuator as described in the first embodiment, which can be a yoke type pneumatic actuator, and the pneumatic actuator further comprises a cylinder module 1 and a driving module 2, etc. The driving module 2 of the embodiment comprises a box body 21 connected between the cylinder module 1 and the spring module 3, and a yoke assembly rotatably provided in the box body 21.

[0064] Moreover, in combination with Figure 2 and Figure 8As shown, the shifting fork assembly comprises a driving member 23 reciprocating along a preset direction, and a shifting fork 22 rotated by the driving member 23, the shifting fork 22 is used to be connected with the valve rod of the valve, and the driving member 23 can drive the shifting fork 22 to switch between the first rotation limit position and the second rotation limit position under the driving of the cylinder module 1 and the spring module 3.

[0065] The shifting fork 22 of the embodiment is used to drive the valve to open and close through the valve rod under the driving of the cylinder module 1 and the spring module 3, and the first rotation limit position and the second rotation limit position correspond to two positions of the valve being fully opened and fully closed.

[0066] In addition, in the embodiment, as a preferred implementation form, the box body 21 is provided with a guide rod 24 extending along a preset direction, and the driving member 23 is guided and slid on the guide rod 24, so as to improve the stability of the guided movement of the driving member 23.

[0067] In the embodiment, as a preferred implementation form, the shifting fork 22 comprises a shifting fork shaft 221 rotatably arranged on the box body 21, and a shifting plate 222 arranged on the shifting fork shaft 221 and connected with the driving member 23 in linkage, and the shifting fork shaft 221 is provided with a connecting hole 223 used to be connected with the valve rod.

[0068] Furthermore, in the specific structure, the connecting hole 223 can also be preferably provided with a key groove 2211 used to be matched with the connecting key on the valve rod, so as to ensure the connection reliability between the shifting fork shaft 221 and the valve rod. The shifting plate 222 is arranged in two along the axial direction of the shifting fork shaft 221, and the axial direction of the shifting fork shaft 221 is perpendicular to the preset direction.

[0069] At the same time, as a preferred implementation form, the shifting plate 222 of the embodiment is provided with a sliding groove 2221 extending along the radial direction of the shifting fork shaft 221, and the driving member 23 is connected with the shifting plate 222 in linkage through a sliding rod 231 slidably arranged in the sliding groove 2221.

[0070] Furthermore, in the pneumatic actuator related by the embodiment, the cylinder module 1 comprises a cylinder body 11, a piston 12 slidably arranged in the cylinder body 11, and a piston rod 121 connecting the piston 12 and the driving member 23, and the cylinder body 11 is also provided with a guide rod 13 used to guide the guided movement of the piston 12, and the guide rod 13 can be preferably provided in multiple, for example, four, so as to provide the guiding action for the piston 12, improve the stability of the translation of the piston 12, and avoid the piston 12 from being twisted and deformed due to different local forces.

[0071] It is still to be mentioned that the preset direction of the present embodiment is generally the same as the moving direction of the piston rod 121 in the cylinder module 1, that is, the same as the axial direction of the cylinder body 11. Of course, the driving member 23 of the present embodiment preferably adopts the slider commonly known by those skilled in the art, and the two ends of the driving member 23 in the preset direction are respectively provided with a first mounting hole for connecting the piston rod 121 and a second mounting hole for connecting the spring pull rod. The related structure parts not mentioned in the pneumatic actuator of the present embodiment can also be referred to the structures in the fork type pneumatic actuator known by those skilled in the art, which will not be described here.

[0072] In addition, the box 21 of the present embodiment is preferably provided with a stop portion for preventing the valve from rotating relative to the box 21, so as to realize the positioning installation between the valve and the box 21, thereby reducing the disassembly difficulty between the driving module 2 and the valve, so as to improve the practicability.

[0073] Specifically, as a preferred implementation form, as shown in Figure 1 the side of the box 21 is formed with a connecting flange 211 connected with the valve, and the connecting flange 211 is provided with a relief hole for avoiding the insertion of the valve rod into the connecting hole 223. Moreover, the stop portion includes a stop hole 2111 concavely arranged on the connecting flange 211, which is used for cooperating with the protrusion on the valve to prevent the valve from rotating.

[0074] Here, by arranging the connecting flange 211 on the box 21, the installation of the box 21 and the valve is facilitated, and by arranging the relief hole, the assembly between the valve rod and the fork assembly can be ensured, and the stop hole 2111 is adopted for the stop portion, which is simple in structure and easy to manufacture the whole connecting flange 211 and the box 21.

[0075] As a preferred implementation form, the stop hole 2111 of the present embodiment extends along the radial direction of the relief hole, and the stop hole 2111 is arranged on both sides of the relief hole, and the two stop holes 2111 can be mirror image arranged. The advantage of such arrangement is that it is beneficial to ensure the stability and reliability of the stop, that is, to prevent the relative rotation between the valve and the box 21, and to improve the assembly efficiency.

[0076] Meanwhile, as a preferred implementation form, the connecting flange 211 of the present embodiment is provided with a plurality of lightening holes 2112, which are arranged along the circumferential direction of the relief hole, which is beneficial to realize the lightweight design. In the specific structure, the number and arrangement of the lightening holes 2112 can be set and adjusted according to the actual lightening requirement, for example, it can be arranged as four or six or the like which are uniformly arranged along the circumferential direction of the relief hole.

[0077] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A spring rod, characterized in that: comprising a rod body (34), and a plurality of first reinforcing portions and a plurality of second reinforcing portions arranged on the rod body (34); each of the first reinforcing portions is arranged along the axial direction of the rod, each of the first reinforcing portions and each of the second reinforcing portions are arranged in a staggered manner along the circumferential direction of the rod, and along the circumferential direction of the rod, the width H1 of each of the first reinforcing portions and the width H2 of each of the second reinforcing portions satisfy: H1 > H2.

2. The spring rod according to claim 1, characterized in that: along the circumferential direction of the rod, the width H1 of each of the first reinforcing portions and the width H2 of each of the second reinforcing portions satisfy: 2H2 ≤ H1 ≤ 3H2.

3. The spring rod according to claim 2, characterized in that: each of the first reinforcing portions is a protruding rib (341) arranged on the rod body (34) and protruding radially along the rod body (34); and / or, each of the second reinforcing portions is a groove (342) arranged on the rod body (34) and arranged axially along the rod body (34).

4. The spring rod according to claim 3, characterized in that: the grooves (342) are arranged in a plurality of axially spaced manner along the rod body (34).

5. The spring rod according to claim 4, characterized in that: the spacing S between each of the grooves (342) and the length L of each of the grooves (342) satisfy: S ≥ 0.2L.

6. The spring rod according to claim 3, characterized in that: the height h1 of each of the protruding ribs (341) along the radial direction of the rod body (34) and the depth h2 of each of the grooves (342) along the radial direction of the rod body (34) satisfy: h1 : h2 = 1 : (1-2).

7. The spring rod according to any one of claims 3 to 6, characterized in that: both ends of the length direction of each of the protruding ribs (341) are provided with an inclined surface β, and the included angle α between each of the inclined surfaces β and the outer peripheral wall of the rod body (34) is ≥ 120°.

8. The spring rod according to any one of claims 3 to 6, characterized in that: both ends of the length direction of each of the grooves (342) are smoothly transitioned with the outer peripheral wall of the rod body (34).

9. A spring module (3), characterized in that: comprising a cylindrical cylinder body (31), a first end cover (32) and a second end cover (33) arranged at the two open ends of the cylinder body (31) respectively, and the spring rod of any one of claims 1 to 8 slidingly arranged on the first end cover (32); the spring rod and the cylinder body (31) are coaxially arranged, and one end of the spring rod protruding out of the first end cover (32) is used to connect with a sliding block in a driving module (2).

10. The spring module (3) according to claim 9, characterized in that: ​ The spring seat (35) connected with the pull rod body (34) is arranged in the cylinder body (31), and the first spring (36) and the second spring (37) are arranged between the first end cover (32) and the spring seat (35), and the second spring (37) is located in the first spring (36); The elastic coefficient k1 of the first spring (36) and the elastic coefficient k2 of the second spring (37) satisfy: k2 / k1 is between 0.5-0.8.

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