Electric cylinder with non-return and hand-cranking functions

Abstract

The utility model relates to the technical field of electric cylinders, and particularly discloses an electric cylinder with non-return and hand-cranking functions, which comprises a fixed seat, a motor arranged on the fixed seat, and a cylinder body assembly, a movable rotating shaft is arranged on the fixed seat, one end of the rotating shaft is rotationally connected with an output shaft of the motor through a bevel gear pair, and the motor drives a telescopic rod of the cylinder body assembly to execute telescopic action through the bevel gear pair; the fixing base is provided with a friction pair acting on the rotating shaft and an adjusting mechanism used for adjusting the friction torque between the friction pair and the rotating shaft, and the friction torque acts on the motor through the bevel gear to enable the cylinder assembly to execute the non-return action. The electric cylinder realizes non-return through a friction pair and an adjusting mechanism, so that the motor can be effectively prevented from rotating reversely, and safety is guaranteed; the device is simple in structure and convenient to maintain, friction torque can be flexibly adjusted, the device is suitable for different working conditions, and universality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric cylinder technical field especially discloses an electric cylinder with backstop and hand cranking function. BACKGROUND

[0002] In the industrial automation process, various devices have increasingly stringent performance requirements for electric cylinders. Traditional electric cylinders have deficiencies in backstop function. The motor is easily reversed by external force after stopping, causing unstable operation of the device, especially in scenarios with extremely high position accuracy requirements, such as precise positioning links in semiconductor chip manufacturing. A small amount of reverse displacement can cause product scrap. In addition, conventional electric cylinders often rely on electric power for driving. Once the motor fails or the power supply is interrupted, the device cannot work, and there is a lack of emergency operation means. In power unstable areas such as field exploration and temporary construction sites, use is limited. Moreover, traditional electric cylinders have poor flexibility in power transmission control and are difficult to switch between different working modes flexibly. In the face of complex and variable loads, the motor and transmission components are easily damaged. At the same time, the structural design needs to be improved in terms of stability and friction efficiency. Frequent start-stop and heavy load impact cause severe component wear, affecting device service life and operating efficiency. SUMMARY

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide an electric cylinder with backstop and hand cranking function.

[0004] To achieve the above-mentioned purpose, the utility model discloses an electric cylinder with backstop and hand cranking function, which comprises a fixed seat, a motor arranged on the fixed seat, and a cylinder assembly. The fixed seat is provided with a movable rotating shaft. One end of the rotating shaft is rotatably connected to the output shaft of the motor through a bevel gear pair. The motor drives the telescopic rod of the cylinder assembly to perform telescopic action through the bevel gear pair. The fixed seat is provided with a friction pair acting on the rotating shaft and an adjusting mechanism for adjusting the friction torque between the friction pair and the rotating shaft. The friction torque acts on the motor through the bevel gear pair to make the cylinder assembly perform backstop action.

[0005] Further, the friction pair has a first friction piece fixed to the fixed seat and a second friction piece that can move axially on the rotating shaft. The adjusting mechanism drives the second friction piece to press against and extrude the first friction piece or move away from the first friction piece to adjust the friction torque output from the rotating shaft to the output shaft of the motor.

[0006] Further, one end of the rotating shaft away from the bevel gear pair is provided with a handle. The handle is used to manually drive the rotating shaft to realize emergency operation of the electric cylinder or mechanical adjustment in the power-off state.

[0007] Further, the bevel gear pair has a first bevel gear arranged on the rotating shaft and a second bevel gear arranged on the motor output shaft, the rotating shaft is arranged axially crossing the motor output shaft; the first bevel gear is engaged with the second bevel gear for realizing power transmission between the motor output shaft and the rotating shaft.

[0008] Further, the adjusting mechanism has an adjusting nut, the rotating shaft is provided with an internal thread matched with the adjusting nut, and the adjusting nut is screwed with the rotating shaft through the internal thread; the second friction member is driven by rotating the adjusting nut to abut against the first friction member to realize abutting extrusion or separation between the second friction member and the first friction member, so that the friction torque is adjusted.

[0009] Further, the fixing seat is provided with a nut sleeve, a first shaft shoulder and a spring, the two ends of the spring are respectively limited through the fixing seat and the first shaft shoulder, the fixing seat is provided with a threaded hole, the nut sleeve is screwed with the fixing seat through the threaded hole, and the nut sleeve is driven to move the first shaft shoulder by screwing on the threaded hole, so that the two bevel gears in the bevel gear pair are connected or separated through the spring, and then the input of the friction torque or the input of the zero friction torque is controlled.

[0010] Further, the rotating shaft is provided with a shaft sleeve, the inner diameter of the shaft sleeve is in interference fit with the rotating shaft, and the outer diameter of the shaft sleeve is in clearance fit with the fixing seat; the two ends of the shaft sleeve are respectively used for abutting against the bevel gear pair and the first shaft shoulder; the driving of the nut sleeve is transmitted to the shaft sleeve through the first shaft shoulder and the spring, and then acts on the bevel gear pair.

[0011] Further, the second friction member has a frustum structure, the outer diameter of the second friction member linearly increases from one end close to the adjusting nut to the side of the first friction member, and a conical surface matching structure is formed between the second friction member and the first friction member, and the contact pressure between the second friction member and the first friction member changes through the rotation of the adjusting nut.

[0012] Further, the shaft diameter of the rotating shaft and the shaft sleeve is linearly increased from one end close to the bevel gear pair to one end away from the bevel gear pair.

[0013] Further, the rotating shaft is provided with a second shaft shoulder, the second shaft shoulder is arranged close to the bevel gear pair, one end of the shaft sleeve close to the bevel gear pair forms a pushing part for abutting against and pushing the second shaft shoulder, the pushing part protrudes radially along the rotating shaft towards the fixing seat, and an activity gap is arranged between the second shaft shoulder and the fixing seat for the pushing part to move.

[0014] The utility model discloses the beneficial effect of:

[0015] (1) Reverse and flexible adjustment: by adjusting the nut and the internal thread of the rotating shaft, the friction torque between the second friction piece and the first friction piece can be conveniently and accurately adjusted, and the reverse function is realized. When the motor is stopped, it effectively prevents reverse rotation, ensures the safe and stable operation of the equipment, and can also flexibly adjust the reverse effect according to different working conditions, enhancing the versatility.

[0016] (2) Hand crank and power control: The handle is arranged at one end of the rotating shaft, and the bevel gear pair is matched, so that the electric cylinder has a hand crank function. When the motor fails, the power is interrupted, or the position of the equipment needs to be finely adjusted, manual operation can be performed to improve the operation flexibility and emergency handling capacity. At the same time, the rotating nut sleeve can control the connection or disconnection of the bevel gear pair, and flexibly switch the power transmission mode to protect the motor and the transmission system.

[0017] (3) Stable structure and efficient operation: The bearing and the shaft sleeve between the rotating shaft and the fixed seat are matched through interference and clearance respectively, which enhances the structural stability, reduces the shaking displacement of the rotating shaft, and ensures the stable transmission of power. The conical frustum design of the second friction piece and the taper surface matching with the first friction piece improve the contact pressure adjustment accuracy and stability, improve the friction efficiency, and prolong the service life of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a whole structure schematic view of the electric cylinder with reverse and hand crank functions.

[0019] Figure 2 It is a local structure schematic view of the electric cylinder.

[0020] Figure 3 It is a local structure schematic view of the electric cylinder without the rotating shaft.

[0021] Figure 4 It is a local structure schematic view of the electric cylinder without the rotating shaft.

[0022] Figure 5 It is a structure schematic view of the rotating shaft of the electric cylinder.

[0023] Figure 6 It is an exploded schematic view of the friction pair and the adjusting mechanism of the electric cylinder.

[0024] The reference signs include: 1, fixed seat; 11, motor; 12, cylinder assembly; 2, rotating shaft; 21, nut sleeve; 22, first shaft shoulder; 23, spring; 24, second shaft shoulder; 25, shaft sleeve; 251, pushing part; 26, movable clearance; 3, bevel gear pair; 31, first bevel gear; 32, second bevel gear; 4, friction pair; 41, first friction piece; 42, second friction piece; 5, adjusting mechanism; 51, adjusting nut; 52, internal thread; 6, handle; 61, holding part; 7, bearing; 71, first bearing; 72, second bearing; 8, disc spring. Detailed Implementation

[0025] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0026] Please see Figures 1 to 6 As shown, an electric cylinder with backstop and hand-crank functions according to this utility model includes a fixed base 1, a motor 11 mounted on the fixed base 1, and a cylinder assembly 12. The fixed base 1 is provided with a movable rotating shaft 2, one end of which is rotatably connected to the output shaft of the motor 11 through a bevel gear pair 3. The motor 11 drives the telescopic rod of the cylinder assembly 12 to perform telescopic action through the bevel gear pair 3. The fixed base 1 is provided with a friction pair 4 acting on the rotating shaft 2 and an adjustment mechanism 5 for adjusting the friction torque between the friction pair 4 and the rotating shaft 2. The friction torque acts on the motor 11 through the bevel gear pair 3 to make the cylinder assembly 12 perform a backstop action.

[0027] In actual use, the fixed base 1 is equipped with a friction pair 4 acting on the rotating shaft 2 and an adjustment mechanism 5 for adjusting the friction torque between the friction pair 4 and the rotating shaft 2. The friction torque acts on the motor 11 through the bevel gear pair 3, causing the cylinder assembly 12 to perform a backstop action. This means that the magnitude of the friction torque can be flexibly controlled by the adjustment mechanism 5, thereby achieving precise control of the backstop function of the electric cylinder. When the electric cylinder needs to stop moving and maintain its position, it can reliably achieve backstop, preventing the telescopic rod from moving on its own due to external forces or other factors, thus improving the stability and safety of the electric cylinder's operation. It is suitable for some occasions where high positional accuracy is required.

[0028] The overall structure is rationally designed, organically combining the motor 11, rotating shaft 2, bevel gear pair 3, friction pair 4, and adjusting mechanism 5 on the fixed base 1. The connections and cooperation between the components are clearly defined, enabling the electric cylinder to achieve both backstop and hand-crank functions while maintaining a compact structure, occupying little space, and facilitating installation and use. This makes it suitable for some space-constrained working environments.

[0029] Specifically, the friction pair 4 has a first friction element 41 fixed to the fixed seat 1 and a second friction element 42 that can move axially on the rotating shaft 2. The adjusting mechanism 5 drives the second friction element 42 to abut against or press against the first friction element 41 or move away from the first friction element 41, so as to adjust the friction torque output from the rotating shaft 2 to the output shaft of the motor 11.

[0030] In actual use, the second friction piece 42 axially movable on the rotating shaft 2 is directly driven by the adjusting mechanism 5 to abut against, press or move away from the fixed first friction piece 41, so as to adjust the friction torque. This design is very intuitive and easy to operate, and can quickly and effectively change the size of the friction torque. Compared with some complex adjustment methods, the control of the electric cylinder's backstop function can be accurately realized without complicated operation steps and complex structure, and the work efficiency is improved.

[0031] The second friction piece 42 can accurately adjust the degree of pressing on the first friction piece 41, thereby realizing accurate control of the friction torque output to the motor 11 output shaft. This accurate control makes the electric cylinder more stable and reliable when backstopping, and can accurately adjust the backstopping force according to actual needs under both small load and large load conditions, avoiding equipment damage or unstable work caused by excessive or insufficient backstopping force, and further improving the work performance and reliability of the electric cylinder under different working conditions. The friction torque can be flexibly adjusted according to different working requirements and load conditions. For different application scenarios, whether it is a situation that requires rapid braking or a situation that requires slow and stable backstopping, the adjusting mechanism 5 can adjust the degree of pressing between the second friction piece 42 and the first friction piece 41, so that the backstopping function of the electric cylinder can adapt to various complex working conditions, and the application range of the electric cylinder is expanded.

[0032] Specifically, the end of the rotating shaft 2 away from the bevel gear pair 3 is provided with a handle 6, and the handle 6 is used for manually driving the rotating shaft 2 to realize emergency operation or mechanical adjustment of the electric cylinder in a powerless state.

[0033] In actual use, it is clear that the end of the rotating shaft 2 away from the bevel gear pair 3 is provided with a handle 6 for manually driving the rotating shaft 2. In the event of a motor 11 failure, power failure or other emergency situations that cause the motor 11 to fail to work normally, the operator can directly drive the rotating shaft 2 by shaking the handle 6, thereby realizing emergency operation of the electric cylinder. This design does not need to rely on external power supply or complex emergency starting equipment, greatly improving the operability and response ability of the equipment in emergency situations, reducing downtime and losses caused by equipment failure. Mechanical adjustment can be performed in a powerless state through the handle 6, which is very practical for scenes that require fine adjustment of the position or state of the equipment without the need for the motor 11 to run. For example, during equipment installation and debugging, or when fine position adjustment of the equipment is required, the handle 6 can be used for slow and accurate operation, improving the adjustment accuracy and flexibility of the equipment, and avoiding wear and energy consumption caused by frequent starting of the motor 11.

[0034] The emergency operation and unpowered mechanical adjustment function makes the electric cylinder adapt to more different working scenes and working condition requirements. Whether relying on the motor 11 for driving in normal working state or manual operation in special circumstances, the operation requirements of the equipment can be met, the application range of the electric cylinder is expanded, and the universality and applicability of the equipment are improved.

[0035] Specifically, the bevel gear pair 3 has a first bevel gear 31 arranged on the rotating shaft 2 and a second bevel gear 32 arranged on the output shaft of the motor 11, and the rotating shaft 2 is arranged axially crossing the output shaft of the motor 11; the first bevel gear 31 and the second bevel gear 32 are engaged to realize power transmission between the output shaft of the motor 11 and the rotating shaft 2.

[0036] In actual use, the rotating shaft 2 is arranged axially crossing the output shaft of the motor 11, and power transmission is realized through the bevel gear pair 3 (the first bevel gear 31 and the second bevel gear 32). This structure design makes the electric cylinder more flexible in space layout. Compared with the transmission mode between parallel shafts, the layout of cross shafts can better adapt to different installation environments and equipment structure requirements, effectively saving installation space, especially suitable for some occasions with strict space size restrictions, improving the space utilization rate of the equipment. The meshing transmission mode of the bevel gear pair 3 can provide relatively stable power transmission. The first bevel gear 31 and the second bevel gear 32 are engaged with each other, and the contact area is relatively large and the engagement is relatively tight during power transmission, which can effectively reduce vibration and noise during transmission, ensure stable power transmission between the output shaft of the motor 11 and the rotating shaft 2, and improve the stability and reliability of the electric cylinder operation, thereby improving the working performance of the entire equipment.

[0037] The transmission efficiency of the bevel gear pair 3 is high, which can efficiently transmit the power output by the motor 11 to the rotating shaft 2, reducing the energy loss in the transmission process. This not only helps to improve the working efficiency of the electric cylinder, but also reduces energy consumption, meets the requirements of energy saving and environmental protection, and effectively reduces the operating cost for long-term operation of the equipment. The power transmission through the bevel gear pair 3 makes the electric cylinder better adapt to different working conditions and load requirements. In some working scenes that require large torque output or need to change the direction of power transmission, the bevel gear pair 3 can effectively convert and transmit the power of the motor 11, meet the actual working requirements of the equipment, and enhance the working adaptability and universality of the electric cylinder.

[0038] Specifically, the adjustment mechanism 5 has an adjustment nut 51, the rotating shaft 2 is provided with an internal thread 52 matched with the adjustment nut 51, and the adjustment nut 51 is screwed with the rotating shaft 2 through the internal thread 52; by rotating the adjustment nut 51 to abut against the second friction piece 42, the second friction piece 42 is abutted and extruded or separated from the first friction piece 41, so as to realize the adjustment of the friction torque.

[0039] In actual use, the adjusting mechanism 5 adopts the mode of cooperation between the adjusting nut 51 and the internal thread 52 in the rotating shaft 2, and the driving of the second friction piece 42 can be realized by rotating the adjusting nut 51, and then the degree of extrusion resistance between the second friction piece 42 and the first friction piece 41 is adjusted or they are separated. This adjustment mode is simple and intuitive, and does not require complex tools or professional skills. The operator can complete the adjustment of the friction torque by using ordinary rotating tools (such as wrenches, etc.), which reduces the operation difficulty and improves the adjustment efficiency. The threaded transmission has good precision and controllability. When the adjusting nut 51 is rotated, the number of rotation circles and the displacement of the adjusting nut 51 can be controlled more accurately, so as to accurately adjust the pressure between the second friction piece 42 and the first friction piece 41, and realize the accurate adjustment of the friction torque. This is very important for application scenarios that need to accurately adjust the reverse stop friction torque according to different working conditions and load requirements, and can ensure that the reverse stop function can reliably play a role in various situations.

[0040] The design of the adjusting nut 51 and the internal thread 52 conforms to the standardization specifications in mechanical manufacturing, and is easy to realize batch production and standardized assembly. This makes the adjusting mechanism 5 can be conveniently applied to different specifications and models of electric cylinder products, improves the universality and interchangeability of the products, is beneficial to the serialized development and production of electric cylinder products, and also provides convenience for users in equipment maintenance and replacement of parts. The structure of the screw connection between the adjusting nut 51 and the rotating shaft 2 makes the overall structure of the adjusting mechanism 5 compact and occupies less space. At the same time, the threaded connection has a certain self-locking property, and after the adjusting nut 51 is adjusted to the appropriate position, it can be relatively stable and not easy to loosen due to external factors such as vibration and impact, thereby ensuring the stability and reliability of the friction torque adjustment, and making the reverse stop function always in normal working state.

[0041] Specifically, the fixed seat 1 is provided with a nut sleeve 21, a first shaft shoulder 22 and a spring 23, both ends of the spring 23 are respectively limited by the fixed seat 1 and the first shaft shoulder 22, the fixed seat 1 is provided with a threaded hole, the nut sleeve 21 is screwed with the fixed seat 1 through the threaded hole, and the screwing movement of the nut sleeve 21 on the threaded hole drives the first shaft shoulder 22 to move, so that the two bevel gears in the bevel gear pair 3 are connected or separated through the spring 23, and then the input of the friction torque or the input of zero friction torque is controlled.

[0042] In actual use, by the screw direction movement of the nut sleeve 21 on the threaded hole of the fixed base 1, the first shaft shoulder 22 can be driven to move, and then the two bevel gears in the bevel gear pair 3 are connected or separated by the spring 23. When the two bevel gears are connected, the input of friction torque can be realized, ensuring the normal work of the backstop function; when the two bevel gears are separated, the input of zero friction torque can be realized, at this time, unnecessary friction can be avoided, for example, when some special operation or debugging is carried out, the transmission of friction torque can be flexibly cut off, increasing the flexibility and selectivity of the working mode of the electric cylinder. The spring 23 is arranged to play a buffering role. During the movement of the nut sleeve 21 driving the first shaft shoulder 22 and the connection or separation of the bevel gear pair 3, the spring 23 can absorb and buffer part of the impact force, reduce the rigid collision between the parts, thereby protecting the bevel gear pair 3 and other related parts, prolonging the service life of the electric cylinder. At the same time, the buffering characteristics of the spring 23 also help to make the connection and separation process of the bevel gear pair 3 more stable, reducing the vibration and noise caused by impact.

[0043] The screwing mode of the nut sleeve 21 and the fixed base 1 can accurately control the movement distance and position of the nut sleeve 21, and then accurately control the movement of the first shaft shoulder 22, realizing the accurate control of the connection or separation state of the bevel gear pair 3. This accurate control is very crucial to ensure the normal operation of the electric cylinder in different working modes, ensuring that the friction torque can be reliably input when the backstop function is needed, and zero friction torque input can be accurately realized when friction torque-free operation is needed. The friction torque input and zero friction torque input can be flexibly controlled, so that the electric cylinder can maintain stable and reliable operation under different working conditions and operation requirements. Avoiding the possible equipment failure or performance decline caused by unnecessary friction torque, at the same time, it also ensures that the backstop function can effectively play a role when needed, improving the overall working reliability and safety of the electric cylinder.

[0044] Specifically, the rotating shaft 2 is provided with a shaft sleeve 25, the inner diameter of the shaft sleeve 25 is in interference fit with the rotating shaft 2, and the outer diameter is in clearance fit with the fixed base 1; the two ends of the shaft sleeve 25 are respectively used to abut against the bevel gear pair 3 and the first shaft shoulder 22; the driving of the nut sleeve 21 is transmitted to the shaft sleeve 25 through the first shaft shoulder 22 and the spring 23, and then acts on the bevel gear pair 3.

[0045] In actual use, the shaft sleeve 25 on the rotating shaft 2 adopts an inner diameter that is in interference fit with the rotating shaft 2 and an outer diameter that is in clearance fit with the fixed seat 1. The interference fit can ensure firm connection between the shaft sleeve 25 and the rotating shaft 2 and prevent relative rotation, thereby ensuring the accuracy and stability of power transmission. The clearance fit between the outer diameter of the shaft sleeve 25 and the fixed seat 1 allows the shaft sleeve 25 to move relatively smoothly within the fixed seat 1 while maintaining a certain positioning accuracy. This fit not only meets the requirements of rotation and axial movement of the rotating shaft 2 but also ensures the accuracy and stability of the entire mechanical structure. The two ends of the shaft sleeve 25 are in abutment with the bevel gear pair 3 and the first shaft shoulder 22, respectively. The drive of the nut sleeve 21 is transmitted to the shaft sleeve 25 through the first shaft shoulder 22 and the spring 23 and then acts on the bevel gear pair 3. Such a design makes the force transmission path more direct and clear, reduces energy loss and deformation during force transmission, and improves the efficiency of force transmission. By using the shaft sleeve 25 as an intermediate link for force transmission, the driving force of the nut sleeve 21 can be more effectively transmitted to the bevel gear pair 3, enabling accurate control of the connection or disconnection state of the bevel gear pair 3 and ensuring the reliability of the electric cylinder mode switching.

[0046] The shaft sleeve 25 can protect the rotating shaft 2 and the fixed seat 1 to some extent. During rotation and axial movement of the rotating shaft 2, the shaft sleeve 25 can withstand part of the friction and wear, avoiding direct contact between the rotating shaft 2 and the fixed seat 1 and prolonging the service life of the rotating shaft 2 and the fixed seat 1. The role of the shaft sleeve 25 in force transmission and component protection helps to ensure the stability and reliability of the entire mechanical structure. During operation of the electric cylinder, the shaft sleeve 25 can effectively ensure normal rotation and axial movement of the rotating shaft 2 while accurately transmitting force, enabling the bevel gear pair 3 to connect or disconnect in the expected manner and ensuring normal implementation of the electric cylinder's check function and other working modes, thereby improving the working reliability of the electric cylinder under various working conditions.

[0047] Specifically, the second friction piece 42 has a conical frustum structure, and the outer diameter dimension of the second friction piece 42 linearly increases from one end close to the adjusting nut 51 to the side of the first friction piece 41. A conical surface fitting structure is formed between the second friction piece 42 and the first friction piece 41. By rotating the adjusting nut 51, the contact pressure between the second friction piece 42 and the first friction piece 41 changes.

[0048] In actual use, the second friction member 42 has a frustum structure and forms a conical surface cooperation with the first friction member 41. This structure enables the contact area and contact pressure between the second friction member 42 and the first friction member 41 to change in a large range when the adjusting nut 51 rotates. Compared with a flat friction structure, the conical surface cooperation can realize a larger change in friction torque with a smaller axial displacement, thereby increasing the adjustment range of the friction torque and better adapting to different requirements for the check friction torque under different working conditions. Since the outer diameter of the second friction member 42 increases linearly from the end close to the adjusting nut 51 to the side of the first friction member 41, there is a clear linear relationship between the axial displacement of the second friction member 42 and the contact pressure during the rotation of the adjusting nut 51. This enables the operator to more accurately control the amount of rotation of the adjusting nut 51, thereby accurately adjusting the contact pressure between the second friction member 42 and the first friction member 41 and realizing high-precision adjustment of the friction torque, ensuring that the check function can accurately and reliably play a role in various situations.

[0049] The conical surface cooperation structure makes the contact between the second friction member 42 and the first friction member 41 more compact and stable. During operation, even if affected by external factors such as vibration and impact, the cooperation between the conical surfaces can effectively prevent the second friction member 42 and the first friction member 41 from slipping or disengaging relative to each other, thereby ensuring the stability and reliability of the friction pair 4 and improving the working performance and service life of the check function. The large adjustment range of the friction torque and the high-precision adjustment capability enable the electric cylinder to better adapt to different load and working condition requirements. Whether in a light load or a heavy load, the friction torque can be adjusted by the adjusting nut 51 to ensure the effectiveness of the check function, thereby enhancing the working adaptability and versatility of the electric cylinder and expanding its application range.

[0050] Specifically, the shaft diameter of the cooperation between the rotating shaft 2 and the shaft sleeve 25 increases linearly from the end close to the bevel gear pair 3 to the end away from the bevel gear pair 3.

[0051] In actual use, the shaft diameter of the matching part of the rotating shaft 2 and the shaft sleeve 25 increases linearly from the end close to the bevel gear pair 3 to the end away from the bevel gear pair 3. This design makes the shaft sleeve 25 form a gradually strengthened effect similar to an interference fit when it is installed on the rotating shaft 2. The shaft sleeve 25 is relatively easy to install at the end with a smaller shaft diameter, and the fit gradually tightens as it is pushed towards the end with a larger shaft diameter, effectively preventing the shaft sleeve 25 from moving axially or rotating relatively on the rotating shaft 2, thereby enhancing the stability of the fit between the shaft sleeve 25 and the rotating shaft 2 and ensuring the reliability of power transmission. The linearly increasing shaft diameter can make the contact pressure distribution between the shaft sleeve 25 and the rotating shaft 2 more reasonable. During operation, when force is transmitted from the rotating shaft 2 to the shaft sleeve 25, due to the change in shaft diameter, the force can be more evenly distributed on the mating surface between the shaft sleeve 25 and the rotating shaft 2, avoiding the problem of local stress concentration. This not only helps to improve the service life of the rotating shaft 2 and the shaft sleeve 25, but also ensures efficient transmission of force, reduces energy loss, and improves the working performance of the electric cylinder.

[0052] Although the shaft diameter increases linearly, since the change in shaft diameter is continuous, the operator can easily install the shaft sleeve 25 from the end with a smaller shaft diameter and gradually push it forward when installing the shaft sleeve 25. When disassembling, the change in shaft diameter can also be used to relatively easily remove the shaft sleeve 25 from the end with a larger shaft diameter. This design reduces the difficulty of installing and disassembling the shaft sleeve 25 to some extent, improving the efficiency of assembly and maintenance. The design of the changing shaft diameter in combination with the shaft sleeve 25 makes the connection between the rotating shaft 2, the shaft sleeve 25, the fixed seat 1, and other components more tight and coordinated, enhancing the overall integrity of the entire mechanical structure. During operation of the electric cylinder, the relative positions between the components are more stable, which can effectively reduce vibrations and noise caused by loose or displaced components, improving the smoothness and reliability of the equipment operation.

[0053] Specifically, the rotating shaft 2 is provided with a second shaft shoulder 24, the second shaft shoulder 24 is arranged close to the bevel gear pair 3, and the end of the shaft sleeve 25 close to the bevel gear pair 3 forms a pushing part 251 for pushing the second shaft shoulder 24, the pushing part 251 protrudes radially from the rotating shaft 2 to the fixed seat 1, and the second shaft shoulder 24 and the fixed seat 1 are provided with an activity gap 26 for the activity of the pushing part 251.

[0054] In actual use, the pushing part 251 of the shaft sleeve 25 pushes against the second shaft shoulder 24 to accurately control the connection or disconnection state of the bevel gear pair 3. When the bevel gear pair 3 needs to be connected to transmit power, the drive of the nut sleeve 21 is transmitted to the shaft sleeve 25 through the first shaft shoulder 22 and the spring 23, and the pushing part 251 of the shaft sleeve 25 pushes the second shaft shoulder 24 to make the bevel gear pair 3 mesh with each other; when the bevel gear pair 3 needs to be disconnected to realize zero friction torque input and other operations, the nut 51 is adjusted in the opposite direction to the nut sleeve 21, the pushing part 251 of the shaft sleeve 25 moves in the active gap 26, and the bevel gear pair 3 is separated. This accurate control method ensures the accuracy and reliability of the electric cylinder when switching between different working modes. The active gap 26 between the second shaft shoulder 24 and the fixed seat 1 allows the pushing part 251 to move, avoiding interference between the shaft sleeve 25 and other components during movement. When the shaft sleeve 25 pushes the second shaft shoulder 24 or the shaft sleeve 25 rotates with the rotating shaft 2, the active gap 26 provides sufficient space for the pushing part 251 to move, preventing the pushing part 251 from colliding with components such as the fixed seat 1, thereby protecting the components and reducing the risk of damage due to interference, extending the service life of the electric cylinder.

[0055] The pushing part 251 protrudes radially from the fixed seat 1 along the rotating shaft 2 and is in contact with the second shaft shoulder 24. This design allows the shaft sleeve 25 to effectively transmit force to the second shaft shoulder 24, and then to the bevel gear pair 3. The force transmission path is direct and clear, reducing the loss and deformation of the force during transmission and improving the efficiency of force transmission. At the same time, stable force transmission ensures the stability of the bevel gear pair 3 during operation, reducing vibration and noise caused by unstable force transmission, and improving the working performance of the electric cylinder.

[0056] In this embodiment, a bearing 7 is provided between the rotating shaft 2 and the fixed seat 1. The inner ring of the bearing 7 is interference-fitted with the rotating shaft 2, and the outer ring is clearance-fitted with the fixed seat 1.

[0057] In actual use, the inner ring of the bearing 7 is interference-fitted with the rotating shaft 2 to ensure synchronous rotation and avoid power loss and wear caused by relative sliding. The outer ring is clearance-fitted with the fixed seat 1 to allow the bearing 7 to rotate smoothly within the fixed seat 1, reducing frictional resistance during rotation, allowing the rotating shaft 2 to rotate flexibly, and improving the working efficiency of the electric cylinder. During operation, the electric cylinder may be subjected to vibration and impact, and the bearing 7 can act as a buffer and shock absorber. Clearance fitting allows the bearing to adjust its position within a certain range to absorb and disperse vibration energy, reducing damage to the rotating shaft 2 and the fixed seat 1 and extending the service life of the components. The bearing 7 helps to ensure the concentricity of the rotating shaft 2 and the fixed seat 1. Accurate concentricity can reduce eccentricity and imbalance during rotation, reduce vibration and noise, and improve the stability and reliability of the electric cylinder.

[0058] In this embodiment, the number of bearing 7 is set to two, two bearing 7 is respectively first bearing 71, second bearing 72, bearing 7 is positioned by fixed seat 1 and shaft sleeve 27 radially; the first bearing 71 is positioned by the fixed seat 1 at both ends in the axial direction, and the first bearing 71 is located between the first shaft shoulder 23 and the second shaft shoulder 26; the second bearing 72 is in contact with the spring 24 and the second shaft shoulder 26 respectively at both ends in the axial direction.

[0059] In actual use, two bearing 7(first bearing 71, second bearing 72) are set to support the rotating shaft 2 more effectively, share the load of the rotating shaft 2 during operation, reduce the deformation and shaking of the rotating shaft 2, and make the mechanical structure of the electric cylinder more stable and reliable. The positioning mode of the two bearings(radial positioning by fixed seat 1 and shaft sleeve 25, axial positioning of first bearing 71 by fixed seat 1, and axial positioning of second bearing 72 by spring 23 and second shaft shoulder 24) further ensures the accuracy of the relative position between the rotating shaft 2 and the fixed seat 1, shaft sleeve 25 and other components, and improves the overall stability of the structure. The reasonable layout and positioning of bearing 7 make the force on rotating shaft 2 more evenly transmitted to fixed seat 1 and other components, avoiding the problem of local stress concentration. The first bearing 71 is located between the first shaft shoulder 22 and the second shaft shoulder 24, and the second bearing 72 is in contact with the spring 23 and the second shaft shoulder 24, which helps to better balance and disperse the force during force transmission, improving the mechanical properties and working efficiency of the electric cylinder.

[0060] The cooperation of spring 23 and second bearing 72 makes the electric cylinder better adapt to different working conditions during work. Spring 23 can absorb and buffer the impact of external force to some extent, reducing the impact on bearings and rotating shaft 2, especially when the electric cylinder is subjected to vibration or impact load, which can protect the components and prolong their service life. At the same time, this setting is also conducive to ensuring the smooth running of the electric cylinder under different working conditions, improving the reliability and adaptability of the equipment.

[0061] In this embodiment, a disc spring 8 is provided between the first friction member 41 and the second friction member 42.

[0062] In actual use, the disc spring 8 is arranged between the first friction member 41 and the second friction member 42, which greatly enhances the buffering capacity of the electric cylinder. When vibration, impact or load mutation occurs during the operation of the device, the disc spring 8 can quickly elastically deform to absorb and disperse these additional energies. This feature, in combination with the double-bearing 7, spring 24 and other structures, further reduces the impact force borne by the rotating shaft 2 and related components. The elastic force of the disc spring 8 can dynamically regulate the contact pressure between the first friction member 41 and the second friction member 42. When the adjusting nut 51 drives the second friction member 42 to cooperate with the first friction member 41, the presence of the disc spring 8 makes the change of the contact pressure more stable. When it is necessary to increase the friction torque, the disc spring 8 gradually deforms under the extrusion of the second friction member 42, and its reaction force cooperates with the force applied by the adjusting nut 51 to slowly and uniformly increase the contact pressure between the first friction member 41 and the second friction member 42; conversely, when the friction torque is to be reduced, the elastic restoring force of the disc spring 8 helps the second friction member 42 to stably separate from the first friction member 41, avoiding the mutation of the contact pressure.

[0063] The addition of the disc spring 8 helps to maintain stable contact between the first friction member 41 and the second friction member 42. During the operation of the device, due to factors such as vibration and load change, the relative positions of the first friction member 41 and the second friction member 42 may change slightly, and the elastic restoring force of the disc spring 8 can compensate for these changes in time, so that the two always maintain good contact state, ensuring the stable output of the friction torque. The characteristics of the disc spring 8 enable it to adapt to different working conditions. In a high-temperature environment, the thermal stability of the disc spring 8 material ensures that its elastic properties will not decrease significantly due to temperature rise, and it can still effectively play a buffering and regulating role, complementing the function of the spring 24 in compensating for the size change of the components in a high-temperature environment, to ensure the normal operation of the electric cylinder in high-temperature working conditions.

[0064] In this embodiment, the handle 6 is L-shaped, one end of the handle 6 is fixed with the rotating shaft 2, and the other end is provided with a gripping portion 61.

[0065] In actual use, one end of the L-shaped handle 6 is fixed with the rotating shaft 2, and the other end is provided with a gripping portion 61. This design greatly facilitates the manual driving of the rotating shaft 2 by the operator. The position of the gripping portion 61 is carefully designed to conform to the principle of ergonomics, enabling the operator to easily and comfortably hold the handle 6. The shape of the L-shaped handle 6 enables it to better utilize space in the device layout. Its one end is fixed with the rotating shaft 2, occupying less radial space and avoiding interference with other surrounding components. The structure of the L-shaped handle 6 enables the operator to apply force more reasonably when rotating the handle 6. When a larger torque is needed to drive the rotating shaft 2, the operator can use the lever principle of the L-shaped handle 6 to effectively transfer the force to the rotating shaft 2 by changing the gripping position and the direction of the applied force.

[0066] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make minor changes or modifications to the disclosed technical content, or make equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, equivalent change or modification of the above embodiments, which does not depart from the technical solution of the present application, is still within the scope of the technical solution of the present application.

Claims

1. An electric cylinder with anti-reverse and hand-crank functions, comprising a fixed base (1), a motor (11) mounted on the fixed base (1), and a cylinder assembly (12); characterized in that: The fixed base (1) is provided with a movable rotating shaft (2). One end of the rotating shaft (2) is rotatably connected to the output shaft of the motor (11) through a bevel gear pair (3). The motor (11) drives the telescopic rod of the cylinder assembly (12) to perform telescopic action through the bevel gear pair (3). The fixed base (1) is provided with a friction pair (4) acting on the rotating shaft (2) and an adjustment mechanism (5) for adjusting the friction torque between the friction pair (4) and the rotating shaft (2). The friction torque acts on the motor (11) through the bevel gear pair (3) to make the cylinder assembly (12) perform a reverse stop action.

2. An electric cylinder with anti-reverse and hand-crank functions according to claim 1, characterized in that: The friction pair (4) has a first friction element (41) fixed to the fixed seat (1) and a second friction element (42) that can move axially on the rotating shaft (2). The adjustment mechanism (5) drives the second friction element (42) to abut against or press against the first friction element (41) or move away from the first friction element (41) to adjust the friction torque output from the rotating shaft (2) to the motor output shaft.

3. An electric cylinder with backstop and hand-crank functions according to claim 1, characterized in that: The rotating shaft (2) is provided with a handle (6) at the end away from the bevel gear pair (3). The handle (6) is used to manually drive the rotating shaft (2) to realize emergency operation of the electric cylinder or mechanical adjustment in the absence of power.

4. An electric cylinder with backstop and hand-crank functions according to claim 1, characterized in that: The bevel gear pair (3) has a first bevel gear (31) disposed on the rotating shaft (2) and a second bevel gear (32) disposed on the output shaft of the motor (11). The axial direction of the rotating shaft (2) is intersected with the axial direction of the output shaft of the motor (11). The first bevel gear (31) and the second bevel gear (32) mesh to realize the power transmission between the output shaft of the motor (11) and the rotating shaft (2).

5. An electric cylinder with backstop and hand-crank functions according to claim 1, characterized in that: The adjustment mechanism (5) has an adjustment nut (51), and the rotating shaft (2) is provided with an internal thread (52) that matches the adjustment nut (51). The adjustment nut (51) is screwed to the rotating shaft (2) through the internal thread (52). By rotating the adjustment nut (51), the second friction element (42) is driven to abut against the first friction element (41), so that the second friction element (42) abuts against or disengages from the first friction element (41), thereby achieving the adjustment of the friction torque.

6. An electric cylinder with backstop and hand-crank functions according to claim 1, characterized in that: The fixed seat (1) is provided with a nut sleeve (21), a first shoulder (22) and a spring (23). The two ends of the spring (23) are respectively limited by the fixed seat (1) and the first shoulder (22). The fixed seat (1) is provided with a threaded hole. The nut sleeve (21) is screwed to the fixed seat (1) through the threaded hole. The screw movement of the nut sleeve (21) on the threaded hole drives the first shoulder (22) to move, thereby connecting or disengaging the two bevel gears in the bevel gear pair (3) through the spring (23), thereby controlling the input of friction torque or the input of zero friction torque.

7. An electric cylinder with backstop and hand-crank functions according to claim 6, characterized in that: The rotating shaft (2) is provided with a bushing (25). The inner diameter of the bushing (25) is interference-fitted with the rotating shaft (2), and the outer diameter is clearance-fitted with the fixed seat (1). The two ends of the bushing (25) are respectively used to abut against the bevel gear pair (3) and the first shoulder (22). The drive of the nut sleeve (21) is transmitted to the bushing (25) via the first shoulder (22) and the spring (23), and then acts on the bevel gear pair (3).

8. An electric cylinder with backstop and hand-crank functions according to claim 5, characterized in that: The second friction element (42) has a frustum-shaped structure. From the end near the adjusting nut (51) toward the first friction element (41), the outer diameter of the second friction element (42) increases linearly, and a conical surface fit structure is formed between the second friction element (42) and the first friction element (41). The contact pressure between the second friction element (42) and the first friction element (41) changes by rotating the adjusting nut (51).

9. An electric cylinder with backstop and hand-crank functions according to claim 8, characterized in that: The shaft diameter at the point where the rotating shaft (2) mates with the bushing (25) increases linearly from the end near the bevel gear pair (3) to the end away from the bevel gear pair (3).

10. An electric cylinder with backstop and hand-crank functions according to claim 7, characterized in that: The rotating shaft (2) is provided with a second shoulder (24), which is fitted to the bevel gear pair (3). The bushing (25) near the end of the bevel gear pair (3) forms a pushing part (251) for abutting and pushing the second shoulder (24). The pushing part (251) protrudes radially toward the fixed seat (1) along the rotating shaft (2). There is an active gap (26) between the second shoulder (24) and the fixed seat (1) for the pushing part (251) to move.

Images