A kneading massage chair
Through the pressure adjustment mechanism and offset adjustment component, the massage chair can automatically adjust the pressure and position of the kneading head according to the user's body shape, solving the problem that existing massage chairs cannot adapt to different body shapes and positional offsets, and achieving a full-area relaxation and stable soothing effect.
Patent Information
- Application Number
- CN202511914220.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-18
- Publication Date
- 2026-03-03
- Estimated Expiration
- 2045-12-18
AI Technical Summary
Existing massage chairs cannot adjust the massage pressure according to the user's body shape, resulting in poor massage effect for users who are overweight or thin. They also cannot make effective fine adjustments to the massage area when the user's position deviates, which may cause bone impact or soft tissue redness and swelling.
A pressure adjustment mechanism and offset adjustment component were designed. Through motor drive and oil tank system, the pressure and position of the kneading head are automatically adjusted to ensure that the kneading head can adaptively adjust the pressure according to the user's body posture and simultaneously fine-tune the position when the user's body shifts.
It achieves automatic adjustment of massage pressure according to body posture, avoiding bone impact and soft tissue redness and swelling, and ensuring that the kneading head is always aimed at the fatigued area, providing a full-area relaxation effect.
Smart Images

Figure CN121313437B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of massage chair technology, specifically a kneading massage chair. Background Technology
[0002] With the acceleration of urbanization, office workers, those who spend long hours sitting, and the elderly are facing common problems such as stiff neck and shoulders, lower back pain, and myofascial nodules, creating an increasingly urgent need for "deep relaxation and precise therapy." Traditional massage chairs can only provide basic relaxation, while professional TCM massage and physiotherapy services are expensive, difficult to book, and time-consuming, failing to meet users' core demand for "enjoying professional therapy at home anytime." This has driven the upgrade of massage equipment towards "bionic, precise, and deep" approaches. The kneading massage chair is a high-end physiotherapy device that integrates bionic technology and intelligent massage logic. Its core feature is that through a spiral bionic kneading structure, it accurately replicates professional TCM massage techniques, solving the pain points of traditional massage chairs such as single-force and incomplete coverage, providing users with a massage experience close to that of a real person.
[0003] Existing massage chairs, due to varying body shapes, may not provide optimal relief with their preset massage pressure. For overweight individuals with thick muscles, insufficient pressure may prevent the massage heads from penetrating deep fascia, only affecting superficial muscles. This is ineffective in relieving core fatigue issues such as neck and shoulder knots and lower back stiffness, leaving a lingering soreness after the massage. Conversely, for slender individuals with less muscle mass, excessive pressure can directly compress bones or superficial nerves, bypassing muscle relaxation and also hindering relief. Furthermore, if the user's position deviates from the massage area, fine-tuning the massage mechanism is difficult, potentially leading to localized stinging and soft tissue swelling. This can exacerbate uneven stress on the bones, especially for the elderly, those with fragile bones, or patients with scoliosis, potentially causing secondary injuries.
[0004] To address the aforementioned issues, innovative design based on existing methods is urgently needed. Summary of the Invention
[0005] The purpose of this invention is to provide a kneading massage chair to solve the problems in the background art where the preset massage pressure may not be convenient to achieve a good soothing effect due to the different body postures of the massage user, and on the other hand, it is inconvenient to fine-tune the position of the massage mechanism when the user's position is off the massage area. The technical solution of this invention addresses the problem that the existing technical solutions are too simplistic and provides a solution that is significantly different from the existing technology.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a kneading massage chair, comprising a seat and a backrest, wherein a rotating frame is installed at the bottom of the backrest, a support frame is installed at the top of the rotating frame, electric slide rails are installed on the inner wall surfaces of both sides of the support frame, a slide table is slidably connected to the surface of the electric slide rails, a movable frame is provided on the side of the slide table near the middle of the support frame, a movable plate is slidably limited inside the movable frame, a kneading head is provided on the surface of the movable plate, a pressure adjustment mechanism is provided on the inner wall surfaces of both sides of the support frame, and an offset adjustment component is provided at the back end of the movable plate;
[0007] The pressure regulating mechanism includes a fixed plate installed on the inner side wall of the support frame, with a pressure frame slidingly on the surface of the fixed plate; it also includes a mounting platform installed on the inner side wall of the support frame, with a top plate slidingly on the surface of the mounting platform; a connecting rod rotatably connected to the surface of the top plate; and an adjusting frame installed at the end of the movable frame near the electric slide rail.
[0008] Preferably, a lead screw is installed inside the movable frame via a motor, and the inside of the movable plate is threadedly connected to the surface of the lead screw.
[0009] Preferably, a spring is installed on the surface of the fixing plate, and the other end of the spring is connected to the pressure frame.
[0010] Preferably, a spring is installed at the end of the protruding rod on the side of the top plate near the mounting platform, and the other end of the spring is connected to the inside of the mounting platform. The connecting rod is rotatably connected to the surface of the mounting platform through a torsion spring.
[0011] Preferably, an abutment platform is installed on the inner surface of the pressure frame, the upper end of the connecting rod abuts against the surface of the abutment platform, and the lower end of the connecting rod abuts against the end of the top plate near the mounting platform.
[0012] Preferably, a thin rod is installed inside the adjusting frame, and one end of the slide table near the inside of the support frame slides on the surface of the thin rod inside the adjusting frame. A spring is sleeved on the surface of the thin rod, one end of which is connected to the slide table, and the other end is connected to the inner side wall of the adjusting frame.
[0013] Preferably, the offset adjustment assembly includes a turntable rotatably connected inside the movable plate. A support rod is installed inside the turntable. One end of the support rod is connected to the kneading head, and a sleeve is fitted on the surface of the other end of the support rod. An abutment head is installed on the end of the sleeve away from the kneading head. A fixed platform is installed on the back end of the movable plate. A rotating plate is provided on the side of the fixed platform near the kneading head. A first oil tank is installed on the surface of the fixed platform. A first piston rod is slidably limited inside the first oil tank. The first piston rod abuts against the end of the rotating plate near the fixed platform. A second oil tank is installed on the back end of the movable plate. A second piston rod is slidably limited inside the second oil tank. The second piston rod abuts against the inner side of the movable frame. A transmission pipe is also installed on the back end of the movable plate.
[0014] Preferably, the turntable is spherical and rotates omnidirectionally inside the moving plate; a spring is installed at the end of the support rod away from the kneading head, and the other end of the spring is connected to the inside of the sleeve; the protrusion at the end of the contact head is spherical and abuts against the surface of the turntable; a motor is installed on the surface of the fixed platform, the protruding end of the motor passes through the fixed platform, a telescopic rod is installed at the protruding end of the motor, and the protruding end of the telescopic rod is connected to the eccentric position of the turntable.
[0015] Preferably, a spring is fitted on the surface of the second piston rod, one end of the spring is connected to the second oil tank, and the other end of the spring is connected to the protrusion at the end of the second piston rod; a hose is connected between the second oil tank and the transmission pipe, and a hose is connected between the transmission pipe and the first oil tank.
[0016] Compared with the prior art, the beneficial effects of the present invention are:
[0017] 1. This invention, through its movable frame, movable plate, and pressure adjustment mechanism, can adjust the preset pressure of the kneading head according to the user's body shape during massage. For users who are overweight and have thick muscles, the pressure is automatically increased to ensure that the kneading head penetrates deep fascia and effectively relieves problems such as shoulder and neck knots and stiffness in the lower back. For users who are thin and have less muscle mass, the pressure is automatically reduced to avoid pressing hard on bones and focus on relaxing superficial muscles and superficial fascia. This allows users of different body shapes to obtain a stable and soothing effect. The pressure is adaptively adjusted according to body shape, which can avoid bone impact and soft tissue swelling caused by excessive preset pressure. The kneading head pressure is automatically adjusted to a "gentle but effective" range to prevent stinging sensations and pressure injuries.
[0018] 2. This invention, through its kneading head and offset adjustment component, can finely adjust the position of the massage mechanism when the user's body shifts laterally, allowing it to shift with the user. Simultaneously, the massage area of the kneading head increases. When the user shifts laterally (e.g., when sitting with a sideways posture or tilting the body after prolonged sitting), the offset adjustment component automatically senses and drives the massage mechanism to adjust its position, ensuring the kneading head always targets core fatigue areas such as the shoulders, neck, and lower back. This prevents the massage head from acting on non-target areas due to body shift. As the user shifts laterally, the fatigue area slightly expands with the change in posture (e.g., increased muscle tension on the waist or shoulder / back side when tilting to the side). The kneading head simultaneously expands its massage area, covering newly added fatigue points after the shift, avoiding limitation to the initial preset area. This achieves "following the shift + full-area relaxation," improving overall relief efficiency. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the main structure of the present invention;
[0020] Figure 2 This is a schematic diagram of the exploded structure of the main body of the present invention;
[0021] Figure 3 This is a schematic diagram of the rotating frame and support frame of the present invention;
[0022] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A;
[0023] Figure 5 This is a cross-sectional structural diagram of the rotating frame and support frame of the present invention;
[0024] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B;
[0025] Figure 7 This is a schematic diagram of the pressure regulating mechanism of the present invention;
[0026] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point C;
[0027] Figure 9 This is an exploded structural diagram of the adjusting frame, sliding table, and top plate of the present invention;
[0028] Figure 10 This is a schematic diagram of the structure of the back end of the movable plate of the present invention;
[0029] Figure 11 This is an exploded view of the offset adjustment component of the present invention;
[0030] Figure 12 This is a cross-sectional structural diagram of the first oil tank, the second oil tank, and the transmission pipe of the present invention.
[0031] In the diagram: 1. Seat; 2. Backrest; 3. Rotating frame; 4. Support frame; 5. Electric slide rail; 6. Slide table; 7. Moving frame; 8. Moving plate; 9. Lead screw; 10. Kneading head; 111. Fixed plate; 112. Pressing frame; 113. Mounting platform; 114. Top plate; 115. Connecting rod; 116. Adjusting frame; 117. Contact platform; 121. Turntable; 122. Support rod; 123. Sleeve; 124. Contact head; 125. Fixed platform; 126. Turning plate; 127. First oil tank; 128. First piston rod; 129. Second oil tank; 120. Second piston rod; 1201. Transmission pipe. Detailed Implementation
[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0033] Please see Figures 1-12 This invention provides a technical solution: a kneading massage chair, including a seat 1 and a backrest 2. A rotating frame 3 is installed at the bottom of the backrest 2, and a support frame 4 is installed at the top of the rotating frame 3. Electric slide rails 5 are installed on the inner walls of both sides of the support frame 4. A slide table 6 is slidably connected to the surface of the electric slide rails 5. A movable frame 7 is provided on the side of the slide table 6 near the middle of the support frame 4. A movable plate 8 is slidably limited inside the movable frame 7. A lead screw 9 is installed inside the movable frame 7 through a motor. The movable plate 8 is threadedly connected to the surface of the lead screw 9. A kneading head 10 is provided on the surface of the movable plate 8. A pressure adjustment mechanism is provided on the inner walls of both sides of the support frame 4. An offset adjustment component is provided at the back end of the movable plate 8.
[0034] In one embodiment of the present invention, the pressure regulating mechanism includes a fixed plate 111 installed on the inner side wall of the support frame 4, a pressure frame 112 slidingly and limitingly mounted on the surface of the fixed plate 111, a spring mounted on the surface of the fixed plate 111, the other end of the spring being connected to the pressure frame 112, and a mounting platform 113 installed on the inner side wall of the support frame 4, a top plate 114 slidingly and limitingly mounted on the surface of the mounting platform 113, a connecting rod 115 rotatably connected to the surface of the top plate 114, a spring mounted on the protruding end of the top plate 114 near the mounting platform 113, the other end of the spring being connected to the interior of the mounting platform 113, and the connecting rod 115... 15 is rotatably connected to the surface of the mounting platform 113 by a torsion spring. The movable frame 7 is equipped with an adjusting frame 116 near the end of the electric slide rail 5. The inner surface of the pressure frame 112 is equipped with an abutment platform 117. The upper end of the connecting rod 115 abuts against the surface of the abutment platform 117, and the lower end of the connecting rod 115 abuts against the end of the top plate 114 near the mounting platform 113. A thin rod is installed inside the adjusting frame 116. The slide table 6 slides on the surface of the thin rod inside the adjusting frame 116 near the inside of the support frame 4. A spring is sleeved on the surface of the thin rod. One end of the spring is connected to the slide table 6, and the other end is connected to the inner side wall of the adjusting frame 116.
[0035] When the user is larger, their back is in contact with the backrest 2, causing the back to press against the pressure frame 112 and move it towards the fixed plate 111. As the pressure frame 112 moves, its inner contact plate 117 presses against the upper end of the connecting rod 115, causing the connecting rod 115 to rotate on the surface of the mounting platform 113. At this time, the lower end of the connecting rod 115 abuts against the top plate 114, causing the top plate 114 to move towards the moving plate 8. As the top plate 114 moves, it abuts against the adjusting frame 116, causing it to move towards the moving plate 8 as well. The movement of the adjusting frame 116 causes the moving frame 7 to move slightly towards the user's back, and the movement of the moving frame 7 causes the moving plate 8 to move along with it, increasing the massage pressure of the kneading head 10 on the user. The preset pressure of the kneading head 10 is adjusted according to the user's body shape, which is beneficial for users who are overweight or have thick muscles. The pressure is automatically increased to ensure that the kneading head 10 penetrates deep into the fascia, effectively relieving problems such as shoulder and neck knots and stiffness in the lower back. For users with a slender build and less muscle mass, the pressure is automatically reduced to avoid pressing hard on the bones, focusing on relaxing the superficial muscles and fascia. This allows users of different body types to obtain a stable and soothing effect. The pressure is adaptively adjusted according to body posture, which can avoid bone impact and soft tissue swelling caused by excessive preset pressure. When the user's body shifts to the side, the position of the massage mechanism is finely adjusted so that it can shift with the user. At the same time as the position of the massage mechanism is finely adjusted, the massage area of the kneading head 10 is simultaneously increased. When the user's body shifts to the side, the offset adjustment component can automatically sense and drive the massage mechanism to finely adjust its position, so that the kneading head 10 is always aimed at the core fatigue areas such as the shoulders, neck, and lower back.
[0036] In one embodiment of the present invention, the offset adjustment assembly includes a turntable 121 rotatably connected inside the movable plate 8. A support rod 122 is installed inside the turntable 121. One end of the support rod 122 is connected to the kneading head 10, and a sleeve 123 is fitted onto the surface of the other end of the support rod 122. An abutment head 124 is installed at the end of the sleeve 123 away from the kneading head 10. A fixed platform 125 is installed on the back end of the movable plate 8. A rotating plate 126 is arranged on the side of the fixed platform 125 near the kneading head 10. A first oil tank 127 is installed on the surface of the fixed platform 125. A first piston rod 128 is slidably limited inside the first oil tank 127, and the first piston rod 128 abuts against the end of the rotating plate 126 near the fixed platform 125. A second oil tank 129 is installed on the back end of the movable plate 8. A second piston rod 120 is slidably limited inside the second oil tank 129, and the second piston rod 120 abuts against the inner side of the movable frame 7. A transmission pipe 1201 is also installed on the back end of the 8. The turntable 121 is spherical and rotates omnidirectionally inside the moving plate 8. The turntable 121 and the internal cavity of the moving plate 8 form an omnidirectional ball structure. A spring is installed on the end of the support rod 122 away from the kneading head 10, and the other end of the spring is connected to the inside of the sleeve 123. The end protrusion of the contact head 124 is spherical and abuts against the surface of the turntable 126. A motor is installed on the surface of the fixed platform 125. The motor's extended end passes through the fixed platform 125. A telescopic rod is installed on the motor's extended end. The extended end of the telescopic rod is connected to the eccentric position of the turntable 126. A spring is sleeved on the surface of the second piston rod 120. One end of the spring is connected to the second oil tank 129, and the other end of the spring is connected to the end protrusion of the extended end of the second piston rod 120. A hose is connected between the second oil tank 129 and the transmission pipe 1201, and a hose is connected between the transmission pipe 1201 and the first oil tank 127.
[0037] When the user's back rests against the surface of the backrest 2, the rotating plate 126 is eccentrically rotated by the motor. Because the rotating plate 126 abuts against the contact head 124, the friction from the eccentric rotation of the rotating plate 126 causes the contact head 124 to move circumferentially on the surface of the rotating plate 126. This circumferential movement of the contact head 124 causes the turntable 121 to rotate inside the moving plate 8, which in turn causes the kneading head 10 to oscillate in a circular motion, massaging the user's back. Meanwhile, the moving plate 8 moves up and down via the electric slide rail 5, massaging and soothing different areas of the user's back. When the user's body shifts left or right, the motor drives the lead screw 9 to rotate, causing the moving plate 8 to move laterally on the surface of the moving frame 7. While moving, the inner side of the moving frame 7 squeezes the second piston rod 120. At this time, the oil inside the second oil tank 129 is squeezed by the second piston rod 120 and injected into the transmission pipe 1201. At this time, the oil inside the transmission pipe 1201 overflows and is injected into the first oil tank 127. At this time, the oil inside the first oil tank 127 increases, pushing the first piston rod 128 to extend out from the first oil tank 127. The first piston rod 128 extends out and touches the rotating plate 126 to move towards the kneading head 10. At this time, the contact head 124 is squeezed by the rotating plate 126 and slides into the support rod 122. At this time, when the rotating plate 126 drives the contact head 124 to move in a circular motion, it can increase the amplitude of the kneading head 10 swinging in a circular shape.
[0038] Working principle: During the massage, the user first sits on the top of the chair seat 1. When the user's back is against the surface of the backrest 2, the rotating plate 126 is driven by the motor to rotate eccentrically. Since the rotating plate 126 is in contact with the contact head 124, the friction of the rotating plate 126 rotating eccentrically will cause the contact head 124 to move in a circle on the surface of the rotating plate 126. The circular movement of the contact head 124 causes the turntable 121 to rotate inside the moving plate 8, and drives the kneading head 10 to swing in a circle to massage the user's back. At this time, the moving plate 8 is moved up and down by the electric slide rail 5 to massage and soothe different parts of the user's back.
[0039] When the user is large, when the user's back is in contact with the backrest 2, the back presses the pressure frame 112 and moves it toward the fixed plate 111. When the pressure frame 112 moves, the inner contact platform 117 presses the upper end of the connecting rod 115, causing the connecting rod 115 to rotate on the surface of the mounting platform 113. At this time, the lower end of the connecting rod 115 abuts against the top plate 114 and moves the top plate 114 toward the moving plate 8. When the top plate 114 moves, it abuts against the adjustment frame 116 and moves it toward the moving plate 8 together. The movement of the adjustment frame 116 can drive the moving frame 7 to move slightly toward the user's back. The movement of the moving frame 7 causes the moving plate 8 to move along with it, so that the kneading head 10 increases the massage pressure on the user.
[0040] When the user's body shifts left or right, the motor drives the lead screw 9 to rotate, causing the moving plate 8 to move laterally on the surface of the moving frame 7. While the moving plate 8 moves on the surface of the moving frame 7, the inner side of the moving frame 7 squeezes the second piston rod 120. At this time, the oil inside the second oil tank 129 is squeezed by the second piston rod 120 and injected into the transmission pipe 1201. At this time, the oil inside the transmission pipe 1201 overflows and is injected into the first oil tank 127. At this time, the oil in the first oil tank 127 increases, pushing the first piston rod 128 to extend out from the first oil tank 127. The first piston rod 128 extends and moves towards the kneading head 10 by contacting the rotating plate 126. At this time, the contact head 124 is squeezed by the rotating plate 126 and slides into the support rod 122. At this time, when the rotating plate 126 drives the contact head 124 to move in a circle, it can increase the amplitude of the kneading head 10's circumferential swing.
[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A kneading massage chair, comprising a seat (1) and a backrest (2), characterized in that: The backrest (2) is equipped with a rotating frame (3) at the bottom inside. The rotating frame (3) is equipped with a support frame (4) at the top. The inner walls of both sides of the support frame (4) are equipped with electric slide rails (5). The electric slide rails (5) are slidably connected to a slide table (6). A movable frame (7) is provided on one side of the slide table (6) near the middle of the support frame (4). A movable plate (8) is slidably limited inside the movable frame (7). A kneading head (10) is provided on the surface of the movable plate (8). A pressure adjustment mechanism is provided on the inner walls of both sides of the support frame (4). An offset adjustment component is provided at the back end of the movable plate (8). The offset adjustment assembly includes a turntable (121) rotatably connected inside the movable plate (8). A support rod (122) is installed inside the turntable (121). One end of the support rod (122) is connected to the kneading head (10). A sleeve (123) is fitted on the surface of the other end of the support rod (122). An abutment head (124) is installed on the end of the sleeve (123) away from the kneading head (10). A fixed platform (125) is installed on the back end of the movable plate (8). A rotating plate (126) is provided on the side of the fixed platform (125) near the kneading head (10). The pressure regulating mechanism includes a fixed plate (111) installed on the inner side wall of the support frame (4), a pressure frame (112) is slidably limited on the surface of the fixed plate (111), and an installation platform (113) installed on the inner side wall of the support frame (4). A top plate (114) is slidably limited on the surface of the installation platform (113), and a connecting rod (115) is rotatably connected to the surface of the top plate (114). An adjusting frame (116) is installed on one end of the movable frame (7) near the electric slide rail (5). An abutment platform (117) is installed on the inner surface of the pressure frame (112). The upper end of the connecting rod (115) abuts against the surface of the abutment platform (117), and the lower end of the connecting rod (115) abuts against the end of the top plate (114) near the installation platform (113).
2. A kneading massage chair according to claim 1, characterized in that: The movable frame (7) has a lead screw (9) installed inside via a motor, and the movable plate (8) is threadedly connected to the surface of the lead screw (9).
3. A kneading massage chair according to claim 2, characterized in that: A spring is installed on the surface of the fixing plate (111), and the other end of the spring is connected to the pressure frame (112).
4. A kneading massage chair according to claim 3, characterized in that: A spring is installed at the end of the protruding rod on the side of the top plate (114) near the mounting platform (113), and the other end of the spring is connected to the inside of the mounting platform (113). The connecting rod (115) is rotatably connected to the surface of the mounting platform (113) by a torsion spring.
5. A kneading massage chair according to claim 4, characterized in that: The adjusting frame (116) has a thin rod installed inside. The slide table (6) slides on the surface of the thin rod inside the adjusting frame (116) near the inside of the support frame (4). A spring is sleeved on the surface of the thin rod. One end of the spring is connected to the slide table (6), and the other end is connected to the inner side wall of the adjusting frame (116).
6. A kneading massage chair according to claim 5, characterized in that: A first oil tank (127) is installed on the surface of the fixed platform (125). A first piston rod (128) is slidably limited inside the first oil tank (127). The first piston rod (128) abuts against the end of the rotating plate (126) near the fixed platform (125). A second oil tank (129) is installed on the back end of the moving plate (8). A second piston rod (120) is slidably limited inside the second oil tank (129). The second piston rod (120) abuts against the inner side of the moving frame (7). A transmission pipe (1201) is also installed on the back end of the moving plate (8).
7. A kneading massage chair according to claim 6, characterized in that: The turntable (121) is spherical and rotates omnidirectionally inside the moving plate (8); a spring is installed at the end of the support rod (122) away from the kneading head (10), and the other end of the spring is connected to the inside of the sleeve (123); the protrusion at the end of the contact head (124) is spherical and abuts against the surface of the turntable (126); a motor is installed on the surface of the fixed platform (125), the motor protrusion extends through the fixed platform (125), a telescopic rod is installed at the motor protrusion, and the telescopic rod protrusion is connected to the eccentric position of the turntable (126).
8. A kneading massage chair according to claim 7, characterized in that: A spring is fitted on the surface of the second piston rod (120). One end of the spring is connected to the second oil tank (129), and the other end of the spring is connected to the protrusion at the end of the second piston rod (120). A hose is connected between the second oil tank (129) and the transmission pipe (1201), and a hose is connected between the transmission pipe (1201) and the first oil tank (127).
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