Hinge type mechanical expansion shaft mechanism

Abstract

The utility model relates to a hinge type mechanical expansion shaft mechanism which comprises a core shaft, a guide rod and a driving piece, the core shaft is movably arranged in a cylinder fixing seat, and the cylinder fixing seat is coaxially connected with a rotating shaft; the mandrel comprises a fixing shaft, a hinge and expansion keys, the fixing shaft is connected with the expansion keys through the hinge, the expansion keys are movably arranged on the cylindrical surface of the cylindrical fixing seat, the guide rod is coaxially arranged in the axial direction of the fixing shaft and in a hollow cavity of the rotating shaft, and the tail end, exposed out of the rotating shaft, of the guide rod is in transmission connection with the driving part; the driving piece drives the guide rod and the fixing shaft to move linearly in the axial direction, and the fixing shaft moving linearly in the axial direction drives the expansion key to stretch out and draw back relative to the cylindrical surface of the cylinder fixing base through the hinge so as to expand or loosen the charging barrel arranged on the cylinder fixing base in a sleeving mode. The expansion keys are synchronously controlled to stretch out and draw back through the hinges, and through rolling friction of the hinges, the movement resistance of the fixing shaft and the expansion keys is reduced, so that expansion of the mechanical expansion shaft is smoother.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery pole piece production, in particular to a hinge-type mechanical expansion shaft mechanism. Background Art

[0002] At present, for the coils of flexible materials, such as lithium battery electrodes, air shafts or mechanical expansion shafts are usually used to fix the coil barrel during the winding and unwinding operation. The air shaft controls the compressed air to be filled into the airbag through the electromagnetic valve, so that the expansion key on the expansion shaft is inflated, and the expansion key presses the circular roll of the coil, so that the coil does not rotate relative to each other during the rotational unwinding or rewinding, which can well complete the winding and unwinding operation of the coil with low winding precision; the expansion key and the airbag are distributed in the circumferential direction of the expansion shaft. Due to the flexibility of the airbag itself and the fact that the airbag is filled with flowing air, when the expansion key expands the coil, a slight external force applied to any expansion key will cause the expansion key to fail to expand, while the expansion key on the opposite side will over-inflate, causing the coil to swing and rotate easily when unwinding or rewinding, making the air shaft unsuitable for the winding and unwinding operation of the coil with high winding precision.

[0003] Mechanical expansion shafts, on the other hand, can be machined to ensure the coaxial arrangement of the mechanical key blocks along the circumference. Existing mechanical expansion shafts all feature an expansion block connected to a guide block, with a central shaft equipped with a guide groove corresponding to the guide block. The guide block and guide groove are connected by an inclined or conical surface. A pneumatic cylinder pushes and pulls the central shaft to lift the expansion key and secure it against the material barrel. Because the inclined or conical surface between the guide block and the guide groove has a large contact area, resulting in high friction, and multiple expansion keys are distributed circumferentially around the outside of the central shaft, they are prone to jamming during use, affecting the barrel's securement. Furthermore, after prolonged use, the inclined or conical surface can wear severely, affecting the expansion key's expansion and contraction accuracy.

[0004] Therefore, a new mechanical expansion shaft structure is designed. Utility Model Content

[0005] In order to solve the deficiencies of the prior art, the utility model provides a hinge-type mechanical expansion shaft mechanism.

[0006] The utility model provides a hinge-type mechanical expansion shaft mechanism, comprising a core shaft, a guide rod and a driving member, wherein the core shaft is movably arranged inside a cylindrical fixing seat, and the cylindrical fixing seat is coaxially connected with a rotating shaft; the core shaft comprises a fixed shaft, a hinge and an expansion key, the fixed shaft is connected to the expansion key through a hinge, a plurality of the expansion keys are movably arranged on the cylindrical surface of the cylindrical fixing seat, the guide rod is coaxially arranged in the axial direction of the fixed shaft and in the hollow cavity of the rotating shaft, the guide rod is transmission-connected to the driving member at the end exposed to the rotating shaft, the driving member drives the guide rod and the fixed shaft to move in a straight line along the axial direction, and the fixed shaft moving in a straight line along the axial direction drives the expansion key to expand and contract relative to the cylindrical surface of the cylindrical fixing seat through the hinge, so as to tighten or loosen the barrel sleeved on the cylindrical fixing seat.

[0007] In some embodiments, the hinge includes a hinge arm and a hinge shaft, the fixed shaft and the expansion key are both provided with a connecting seat 323 , and the hinge arm is pivotally connected to the corresponding connecting seat 323 via the hinge shaft.

[0008] In some embodiments, the expansion key is arranged parallel to the axial direction of the cylindrical fixing seat.

[0009] In some embodiments, the expansion key includes a support block and a connecting block. The support block is exposed from the cylinder fixing seat and cooperates with the barrel. The connecting block is arranged parallel to the inner side of the support block and is connected to the hinge through the connecting seat 323.

[0010] In some embodiments, the cylindrical fixing seat is provided with a mounting groove matching the shape of the support block, the support block is movably arranged in the mounting groove, and the inner end surface of the support block cooperates with the bottom of the mounting groove to form a limit.

[0011] In some embodiments, the outer wall of the support block is provided with a groove, the groove is arranged along the radial direction of the cylindrical fixing seat, and the inner wall of the installation groove is provided with a universal ball, and the universal ball is rollingly connected to the groove.

[0012] In some embodiments, the guide rod is divided into a rear guide rod and a front guide rod, and the rear guide rod and the front guide rod are coaxially arranged at both ends of the fixed shaft, respectively. The rear guide rod is arranged in the hollow cavity of the rotating shaft and is connected to the driving member in a transmission manner. The front guide rod is coaxially arranged in the end cover of the cylindrical fixed seat, and linear bearings are arranged between the rear guide rod and the rotating shaft, and between the front guide rod and the end cover.

[0013] In some embodiments, a front support plate and a rear support plate are provided outside the rotating shaft, the rotating shaft is movably arranged between the front support plate and the rear support plate through a rotating bearing, and the rear support plate is fixedly connected to the driving member through a bracket.

[0014] In some embodiments, the driving member is a cylinder, and the piston rod of the cylinder is coaxially arranged at one end of the guide rod through a pull rod assembly.

[0015] In some embodiments, the pull rod assembly includes a push-pull seat and a pull rod bearing. The push-pull seat is fixed at the end of the piston rod. The pull rod bearing is coaxially arranged at the end of the guide rod and is clamped in the bayonet of the push-pull seat. The inner ring of the pull rod bearing is fixedly connected to the guide rod, and the outer ring of the pull rod bearing is clamped in the bayonet. The cylinder drives the pull rod bearing and the guide rod to move axially in a straight line through the push-pull seat.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the fixed shaft synchronously controls the extension and retraction of multiple expansion keys through multiple hinges, and has smaller movement resistance than the sliding friction of the inclined surface or conical surface of the traditional mechanical expansion shaft. The rolling friction of the hinge reduces the resistance to the movement of the fixed shaft and the expansion key, making the mechanical expansion shaft expand more smoothly. The fixed shaft and the guide rod are coaxially arranged to ensure that the expansion and retraction of multiple expansion keys are consistent. The hinge method can well ensure the consistency of the expansion and retraction of multiple expansion keys. At the same time, the rigidity of the hinge arm can well support the expansion key, so that the expansion key can stably expand the barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the planar structure of the hinged mechanical expansion shaft mechanism of the embodiment of the present application.

[0018] Figure 2 It is a schematic planar structural diagram of the hinged mechanical expansion shaft mechanism sleeved on the barrel according to an embodiment of the present application.

[0019] Figure 3 Schematic diagram of the internal cross-sectional structure of the hinged mechanical expansion shaft mechanism of the embodiment of the present application.

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the core shaft of an embodiment of the present application.

[0021] Reference numerals: 101, barrel;

[0022] 1. Cylinder fixing seat; 11. Mounting slot; 12. Fixing slot; 13. Support bar; 14. Support bearing; 15. End cover; 16. Universal ball transfer;

[0023] 2. Rotating shaft; 21. Hollow cavity; 22. Rotating bearing; 23. Front support plate; 24. Rear support plate;

[0024] 3. Mandrel; 31. Fixed shaft; 32. Hinge; 321. Hinge arm; 322. Hinge shaft; 323. Connecting seat; 33. Expansion key; 331. Support block; 332. Connecting block; 333. Groove; 334. Outer step;

[0025] 41. Rear guide rod; 42. Front guide rod; 43. Linear bearing;

[0026] 5. Driving member; 51. Piston rod;

[0027] 6. Tie rod assembly; 61. Push-pull seat; 62. Bayonet; 63. Tie rod bearing;

[0028] 7. Bracket. DETAILED DESCRIPTION

[0029] The specific implementation of the present utility model is introduced with reference to the accompanying drawings.

[0030] refer to Figure 1 The figure is a schematic diagram of the planar structure of a hinged mechanical expansion shaft mechanism. The upper side is a cylinder fixing seat 1, the middle part is a rotating shaft 2, and the lower part is a driving member 5. A plurality of expansion keys 33 are arranged in parallel on the cylinder fixing seat 1. A fixed shaft 31 connected to the expansion keys 33 through a hinge 32 is arranged inside the cylinder fixing seat 1. The fixed shaft 31 is connected to the driving member 5 through a rear guide rod 41. The driving member 5 simultaneously controls the extension and contraction of the plurality of expansion keys 33. The barrel 101 will be sleeved on the cylinder fixing seat 1. After the expansion keys 33 tighten the barrel 101, the barrel 101 can rotate together with the cylinder fixing seat 1. The rotating shaft 2 is used to drive the cylinder fixing seat 1 to rotate so as to perform the winding and unwinding operation of the coiled material on the barrel 101.

[0031] refer to Figures 1 to 4 A hinge-type mechanical expansion shaft mechanism includes a core shaft 3, a guide rod and a driving member 5. The core shaft 3 is movably arranged inside the cylindrical fixed seat 1, and the cylindrical fixed seat 1 is coaxially connected with the rotating shaft 2; the core shaft 3 includes a fixed shaft 31, a hinge 32 and an expansion key 33. The fixed shaft 31 is connected to the expansion key 33 through the hinge 32. Multiple expansion keys 33 are movably arranged on the cylindrical surface of the cylindrical fixed seat 1, and the guide rod is coaxially arranged in the axial direction of the fixed shaft 31 and the hollow cavity 21 of the rotating shaft 2. The guide rod is transmission-connected to the driving member 5 at the end exposed to the rotating shaft 2. The driving member 5 drives the guide rod and the fixed shaft 31 to move in a straight line along the axial direction. The fixed shaft 31 moving in a straight line along the axial direction drives the expansion key 33 to expand and contract relative to the cylindrical surface of the cylindrical fixed seat 1 through the hinge 32 to tighten or loosen the barrel 101 sleeved on the cylindrical fixed seat 1.

[0032] The hinge 32-type mechanical expansion shaft mechanism of the present application has a fixed shaft 31 that synchronously controls the extension and contraction of multiple expansion keys 33 through multiple hinges 32. Compared with the sliding friction of the inclined surface or conical surface of the traditional mechanical expansion shaft, it has smaller movement resistance. The rolling friction of the hinge 32 reduces the resistance to movement of the fixed shaft 31 and the expansion key 33, making the mechanical expansion shaft expand more smoothly. The fixed shaft 31 and the guide rod are coaxially arranged to ensure that the expansion and contraction of multiple expansion keys 33 are consistent. The hinge 32 is used to ensure the consistency of the expansion and contraction of multiple expansion keys 33. At the same time, the rigidity of the hinge arm 321 can well support the expansion key 33, so that the expansion key 33 can stably expand the barrel 101.

[0033] In order to install the hinge 32 between the fixed shaft 31 and the expansion key 33, in this embodiment, refer to Figure 4 The hinge 32 includes a hinge arm 321 and a hinge shaft 322 . The fixed shaft 31 and the expansion key 33 are both provided with a connecting seat 323 . The hinge arm 321 is pivotally connected to the corresponding connecting seat 323 through the hinge shaft 322 .

[0034] It can be understood that, with such a configuration, the fixed shaft 31 is a hexagonal prism, and two connecting seats 323 are provided on the six outer wall planes of the fixed shaft 31. Each expansion key 33 is provided with two connecting seats 323. Each expansion key 33 is installed on the outer side of the outer wall plane of the fixed shaft 31 correspondingly through two hinges 32. The hinge arm 321 of the hinge 32 is pivotally connected to the connecting seat 323 through the hinge shaft 322, so that the hinge arm 321 can be stably connected to the connecting seat 323. The connecting seat 323 is provided with a slot for the hinge arm 321 to move, so that the hinge arm 321 has sufficient space for movement.

[0035] In order to facilitate the processing and installation of the expansion key 33, in this embodiment, reference Figure 1 The expansion key 33 is arranged parallel to the axial direction of the cylindrical fixing seat 1.

[0036] It should be further explained that a support bar 13 is provided between two adjacent expansion keys 33, and the support bar 13 is fixed in the fixing groove 12 of the cylindrical fixing seat 1. A support bearing 14 is provided on the support bar 13. The support bearing 14 is partially higher than the cylindrical surface of the cylindrical fixing seat 1, and the rolling direction of the support bearing 14 higher than the cylindrical surface is parallel to the axial direction of the cylindrical fixing seat 1. The support bearing 14 can support the inner wall of the barrel 101 when the barrel 101 is sleeved, and the barrel 101 can be conveniently inserted into the cylindrical fixing seat 1 through the rolling of the support bearing 14.

[0037] It is understandable that, with such an arrangement, a plurality of expansion keys 33 need to be arranged at equal angles on the cylindrical fixing seat 1, and the expansion keys 33 are arranged parallel to the axial direction of the cylindrical fixing seat 1, so that the expansion keys 33 can be arranged as straight strips, which is more convenient to process. It is also more convenient to provide the mounting groove 11 on the cylindrical fixing seat 1, so that the overall processing cost of the mechanical expansion shaft is low, which is conducive to cost control. The straight strip expansion key 33 can be relatively simply installed on the fixed shaft 31 and the cylindrical fixing seat 1 during installation.

[0038] In order to facilitate the processing of the expansion key 33, in this embodiment, reference Figure 4 The expansion key 33 includes a support block 331 and a connecting block 332. The support block 331 is exposed from the cylinder fixing seat 1 and cooperates with the barrel 101. The connecting block 332 is arranged parallel to the inner side of the support block 331. The connecting block 332 is connected to the hinge 32 through the connecting seat 323.

[0039] It can be understood that, with such a configuration, the support block 331 is made of a more wear-resistant and corrosion-resistant material to ensure the service life of the support block 331. At the same time, a frosted surface is provided on the surface of the support block 331 in contact with the barrel 101, thereby ensuring that the support block 331 has better friction with the barrel 101 and that the support block 331 can better expand the barrel 101. The connecting block 332 is made of a metal material that is cheaper than the support block 331 to reduce manufacturing costs.

[0040] In order to install the expansion key 33 on the cylindrical fixing seat 1, in this embodiment, refer to Figure 1 and Figure 3 The cylindrical fixing seat 1 is provided with a mounting groove 11 that matches the shape of the support block 331. The support block 331 is movably arranged in the mounting groove 11. The inner end surface of the support block 331 cooperates with the bottom of the mounting groove 11 to form a limit.

[0041] It can be understood that, with such a configuration, the inner end surface of the support block 331 forms an outer step 334 between the support block 331 and the connecting block 332. During installation, the support block 331 is embedded in the installation groove 11, and the outer step 334 abuts against the bottom of the installation groove 11, and the expansion key 33 is assembled in place. During the expansion process of the expansion key 33, the height of the expansion key 33 is controlled by the length of the hinge arm 321, so that the extension and retraction stroke of the expansion key 33 can be effectively controlled.

[0042] In order to reduce the movement resistance of the expansion key 33, in this embodiment, reference Figure 3 The outer wall of the support block 331 is provided with a groove 333, and the groove 333 is arranged along the radial direction of the cylindrical fixing seat 1. The inner wall of the mounting groove 11 is provided with a universal ball 16, and the universal ball 16 is rollingly connected to the groove 333.

[0043] It can be understood that, with such a configuration, a certain gap is created between the outer wall of the support block 331 and the inner wall of the mounting groove 11 by the assembly of the universal ball 16 and the groove 333. At the same time, the relative positioning of the universal ball 16 and the groove 333 avoids friction between the expansion key 33 and the inner walls of the other two sides of the mounting groove 11 of the cylindrical fixing seat 1 as much as possible. There is rolling contact between the universal ball 16 and the support block 331, and rolling friction is generated between the support block 331 and the inner wall of the mounting groove 11, thereby reducing the resistance of the expansion key 33 during the telescopic movement and reducing the possibility of the expansion key 33 becoming stuck.

[0044] In order to facilitate the installation of the guide rod, in this embodiment, reference Figure 3 The guide rod is divided into a rear guide rod 41 and a front guide rod 42. The rear guide rod 41 and the front guide rod 42 are coaxially arranged at both ends of the fixed shaft 31. The rear guide rod 41 is arranged in the hollow cavity 21 of the rotating shaft 2 and is transmission-connected to the driving member 5. The front guide rod 42 is coaxially arranged in the end cover 15 of the cylindrical fixed seat 1. Linear bearings 43 are arranged between the rear guide rod 41 and the rotating shaft 2, and between the front guide rod 42 and the end cover 15.

[0045] The front and rear guide rods 42 and 41 are respectively provided with linear bearings 43 to ensure that the six expansion keys 33 are uniformly mounted on the cylindrical fixed seat 1.

[0046] In order to install the rotating shaft 2, in this embodiment, refer to Figures 1 to 3 A front support plate 23 and a rear support plate 24 are provided on the outside of the rotating shaft 2. The rotating shaft 2 is movably arranged between the front support plate 23 and the rear support plate 24 through the rotating bearing 22. The rear support plate 24 is fixedly connected to the driving member 5 through the bracket 7.

[0047] It can be understood that, with such an arrangement, the rotating shaft 2 and the cylinder fixing seat 1 are fixed together, and a gear is provided on the rotating shaft 2 to connect to an external rotating motor. The rotating motor drives the rotating shaft 2 to rotate, thereby driving the cylinder fixing seat 1 and the barrel 101 to rotate. The rotating shaft 2 is connected to the front support plate 23 and the rear support plate 24 through a rotating bearing 22, so that the rotating shaft 2 is stably installed between the front support plate 23 and the rear support plate 24, and the mechanical expansion shaft can be well installed on the machine through the front support plate 23 and the rear support plate 24.

[0048] In order to quickly drive the expansion key 33 to expand and contract, in this embodiment, reference Figures 1 to 3 The driving member 5 is a cylinder, and the piston rod 51 of the cylinder is coaxially arranged at one end of the guide rod through the pull rod assembly 6.

[0049] It is understandable that, in such a configuration, a cylinder is used as the power source for the expansion key 33 to extend and retract. The cylinder has a fast reaction and can well drive the guide rod to move linearly. The guide rod drives the fixed shaft 31 to move axially, which is converted into radial movement of the expansion key 33 on the cylindrical fixed seat 1 through the hinge 32, thereby stably driving the expansion key 33 to extend and retract.

[0050] In order to ensure that the rotational torque of the rotating shaft 2 is not transmitted to the cylinder, in this embodiment, the reference Figures 1 to 3 The pull rod assembly 6 includes a push-pull seat 61 and a pull rod bearing 63. The push-pull seat 61 is fixed at the end of the piston rod 51. The pull rod bearing 63 is coaxially arranged at the end of the guide rod and is clamped in the bayonet 62 of the push-pull seat 61. The inner ring of the pull rod bearing 63 is fixedly connected to the guide rod, and the outer ring of the pull rod bearing 63 is clamped in the bayonet 62. The cylinder drives the pull rod bearing 63 and the guide rod to move axially in a straight line through the push-pull seat 61.

[0051] It can be understood that, with such an arrangement, when the rotating shaft 2 drives the cylindrical fixing seat 1 and the material barrel 101 to rotate to reel in and out the coiled material, the cylindrical fixing seat 1 will drive the core shaft 3 and the guide rod to rotate, and the rotating rear guide rod 41 will drive the inner ring of the tie rod bearing 63 to rotate. The inner ring and outer ring of the tie rod bearing 63 rotate relative to each other, so that the rotational torque of the rotating shaft 2 will only be transmitted to the inner ring of the tie rod bearing 63. The cylinder piston rod 51 is connected to the outer ring of the tie rod bearing 63 through the pushing seat, which can ensure that the rotational torque of the rotating shaft 2 will not be transmitted to the piston rod 51, and will not affect the cylinder piston rod 51, thereby ensuring the service life of the cylinder.

[0052] The fixed shaft 31 of the present embodiment synchronously controls the expansion and contraction of multiple expansion keys 33 through multiple hinges 32. The rolling friction of the hinges 32 reduces the resistance to the movement of the fixed shaft 31 and the expansion keys 33, making the mechanical expansion shaft expansion smoother. The fixed shaft 31 and the guide rod are coaxially arranged to ensure that the expansion keys 33 expand and contract in unison. The rear guide rod 41 is connected to the core shaft 3, and the core shaft 3 is connected to the expansion keys 33 and the fixed shaft 31 by the hinge 32. The cylinder pushes the rear guide rod 41, which is equivalent to pushing the fixed shaft 31 of the core shaft 3 to move in an axial straight line. The expansion key 33 can only move in the radial direction of the cylinder fixing seat 1 under the restriction of the mounting groove 11 of the cylinder fixing seat 1. This is manifested in that the expansion key 33 extends from the mounting groove 11 to expand the barrel 101 between the cylinder fixing seat 1 and the barrel 101, and retracts into the mounting groove 11 to cancel the expansion. The rear guide rod 41 and the cylinder piston rod 51 are connected by a tie rod bearing 63. The cylinder only pushes the outer ring of the tie rod bearing 63, so that when the rear guide rod 41 and the core shaft 3 rotate as a whole with the cylinder fixing seat 1, they will not affect the cylinder, thereby protecting the service life of the cylinder.

[0053] The above does not limit the technical scope of the present invention. Any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A hinged mechanical expansion shaft mechanism, characterized in that: It includes a core shaft, a guide rod and a driving member. The core shaft is movably arranged inside the cylindrical fixed seat, and the cylindrical fixed seat is coaxially connected with a rotating shaft; the core shaft includes a fixed shaft, a hinge and an expansion key. The fixed shaft is connected to the expansion key through a hinge, and a plurality of the expansion keys are movably arranged on the cylindrical surface of the cylindrical fixed seat. The guide rod is coaxially arranged in the axial direction of the fixed shaft and in the hollow cavity of the rotating shaft. The guide rod is transmission-connected to the driving member at the end exposed to the rotating shaft. The driving member drives the guide rod and the fixed shaft to move in a straight line along the axial direction. The fixed shaft moving in a straight line along the axial direction drives the expansion key to expand and contract relative to the cylindrical surface of the cylindrical fixed seat through the hinge to tighten or loosen the barrel sleeved on the cylindrical fixed seat.

2. The hinge-type mechanical expansion shaft mechanism according to claim 1, characterized in that: The hinge includes a hinge arm and a hinge shaft. The fixed shaft and the expansion key are both provided with a connecting seat. The hinge arm is pivotally connected to the corresponding connecting seat through the hinge shaft.

3. The hinge-type mechanical expansion shaft mechanism according to claim 1, characterized in that: The expansion key is arranged parallel to the axial direction of the cylindrical fixing seat.

4. The hinge-type mechanical expansion shaft mechanism according to claim 1, characterized in that: The expansion key includes a support block and a connecting block. The support block is exposed from the cylinder fixing seat and cooperates with the barrel. The connecting block is arranged parallel to the inner side of the support block and is connected to the hinge through the connecting seat.

5. The hinge-type mechanical expansion shaft mechanism according to claim 4, characterized in that: The cylindrical fixing seat is provided with a mounting groove matching the shape of the support block. The support block is movably arranged in the mounting groove. The inner end surface of the support block cooperates with the bottom of the mounting groove to form a limit.

6. The hinge-type mechanical expansion shaft mechanism according to claim 5, characterized in that: The outer wall of the support block is provided with a groove, and the groove is arranged along the radial direction of the cylindrical fixing seat. The inner wall of the installation groove is provided with a universal ball, and the universal ball is rollingly connected with the groove.

7. The hinge-type mechanical expansion shaft mechanism according to claim 1, characterized in that: The guide rod is divided into a rear guide rod and a front guide rod, and the rear guide rod and the front guide rod are coaxially arranged at both ends of the fixed shaft respectively. The rear guide rod is arranged in the hollow cavity of the rotating shaft and is connected to the driving member. The front guide rod is coaxially arranged in the end cover of the cylindrical fixed seat. Linear bearings are arranged between the rear guide rod and the rotating shaft and between the front guide rod and the end cover.

8. The hinge-type mechanical expansion shaft mechanism according to claim 7, characterized in that: A front support plate and a rear support plate are provided on the outside of the rotating shaft. The rotating shaft is movably arranged between the front support plate and the rear support plate through a rotating bearing. The rear support plate is fixedly connected to the driving member through a bracket.

9. The hinge-type mechanical expansion shaft mechanism according to claim 1, characterized in that: The driving member is a cylinder, and the piston rod of the cylinder is coaxially arranged at one end of the guide rod through a pull rod assembly.

10. The hinge-type mechanical expansion shaft mechanism according to claim 9, characterized in that: The pull rod assembly includes a push-pull seat and a pull rod bearing. The push-pull seat is fixed at the end of the piston rod. The pull rod bearing is coaxially arranged at the end of the guide rod and is clamped in the bayonet of the push-pull seat. The inner ring of the pull rod bearing is fixedly connected to the guide rod, and the outer ring of the pull rod bearing is clamped in the bayonet. The cylinder drives the pull rod bearing and the guide rod to move axially in a straight line through the push-pull seat.

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