Torque overload protection transmission device, lifting driving system of shifting machine and shifting machine

Abstract

The utility model discloses a torque overload protection transmission device, which comprises a torque input component, a torque output component, a torque overload protection component, a torque overload protection component and a torque overload protection component, and is characterized in that the torque input component comprises an input transmission body and an input connector which rotate synchronously; the torque output component comprises an output transmission body and an output connecting body which rotate synchronously, and the output connecting body is provided with a second transmission groove; the torque limiter comprises an elastic pre-tightening part and a transmission part capable of moving in the radial direction of the torque input part and the torque output part; wherein the elastic pre-tightening part applies pre-tightening force to the transmission part, so that the transmission part is simultaneously kept in joint with the first transmission groove and the second transmission groove under preset torque; the torque output component forces the transmission part to move in the radial direction to be separated from the first transmission groove and / or the second transmission groove when bearing overload torque, so that the torque output component idles relative to the torque input component, and overload protection is implemented. In addition, the utility model further discloses a lifting driving system of the shifting machine and the shifting machine.

Description

[Technical field]

[0001] The utility model relates to the technical field of transmission devices, in particular to a torque overload protection transmission device, a lifting drive system of a transfer machine and the transfer machine. [Background technology]

[0002] The transmission device on the existing transfer machine generally includes a torque input component and a torque output component connected to the load. The torque input component is used to receive power input, and the torque output component is used to output power to achieve the lifting and lowering of the load. When the load is overloaded, the load will apply excessive reverse torque to the torque output component, and the excessive reverse torque will be transmitted to the components of the entire transmission chain where the torque output component is located, thereby causing damage to the components of the entire transmission chain, thereby shortening the service life of the transmission device. [Contents of the utility model]

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a torque overload protection transmission device, a lifting drive system of a transfer machine and a transfer machine, which can cut off the torque transmission between the torque input component and the torque output component when the load is overloaded, so that the torque output component can idle relative to the torque input component, thereby achieving overload protection, thereby avoiding damage to the transmission device and extending the service life of the transmission device.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] Torque overload protection transmission, comprising:

[0006] a torque input component, comprising an input transmission body and an input connection body that rotate synchronously, the input transmission body receiving power input, the input connection body having a first transmission groove; and

[0007] a torque output component, comprising an output transmission body and an output connecting body that rotate synchronously, the output transmission body outputs power, and the output connecting body has a second transmission groove; and

[0008] A torque limiter, comprising an elastic preload component and a transmission member capable of moving in radial directions between a torque input component and a torque output component;

[0009] Wherein, the elastic preload component applies a preload force to the transmission member so that the transmission member remains engaged with the first transmission groove and the second transmission groove at a predetermined torque at the same time; when the torque output component is subjected to an overload torque, it forces the transmission member to move radially out of the first transmission groove and / or the second transmission groove so that the torque output component idles relative to the torque input component to implement overload protection.

[0010] The transmission member in the utility model can move radially along the torque input member and the torque output member. Under a predetermined torque, the transmission member maintains engagement with the first transmission groove and the second transmission groove under the preload force of the elastic preload member. At this time, the torque input member can transmit the torque to the torque output member through the transmission member to maintain the power transmission between the torque input member and the torque output member; and when the load is overloaded, the torque output member forces the transmission member to move radially outward when subjected to the overload torque, so that the transmission member disengages from the first transmission groove and / or the second transmission groove, thereby cutting off the torque transmission between the torque input member and the torque output member, allowing the torque output member to idle relative to the torque input member to implement overload protection, and the idling of the torque output member can quickly release the reverse torque applied by the load, thereby avoiding damage to the torque output member, and because the torque output member cannot transmit the reverse torque of the load to the torque input member, it also avoids damage to the torque input member due to the reverse torque of the excessive load, thereby avoiding damage to the transmission device and extending the service life of the transmission device.

[0011] In the above torque overload protection transmission device, the input connector is coaxially arranged with the output connector, the first transmission groove is arranged on the outer peripheral side of the input connector, the second transmission groove is arranged on the outer peripheral side of the output connector, and the first transmission groove and the second transmission groove are arranged axially correspondingly along the rotation axis of the input connector, and the elastic preload component is located on the side of the transmission member away from the first transmission groove and the second transmission groove to apply a preload force to the transmission member. Such a design can facilitate the processing and forming of the first transmission groove and the second transmission groove, thereby reducing the processing difficulty of the input connector and the output connector, and further reducing the processing cost; at the same time, since there is enough space on the side of the transmission member away from the first transmission groove and the second transmission groove, the elastic preload component is arranged on the side of the transmission member away from the first transmission groove and the second transmission groove, which can facilitate the assembly of the elastic preload component.

[0012] In the above torque overload protection transmission device, the input connector or the output connector is connected to a synchronously rotating limiter, the limiter includes a limiter head, and the elastic pre-tightening component is pre-tightened between the limiter head and the transmission member. With such a design, the elastic pre-tightening component can be put into a compressed state through the limiter head, so that the elastic pre-tightening component keeps applying a pre-tightening force to the transmission member, so that under a predetermined torque, the transmission member is simultaneously engaged with the first transmission groove and the second transmission groove.

[0013] In the above torque overload protection transmission device, the limiter is fixedly connected to the input connector or the output connector and extends along the radial direction thereof, and the limiter includes a guide rod that penetrates the transmission member, and the elastic preload member is sleeved on the guide rod. With such a design, the elastic preload member can be guided by the guide rod for the expansion and contraction of the elastic preload member and the radial movement of the transmission member, so as to avoid the displacement of the elastic preload member during the expansion and contraction process, and ensure the stability of the radial movement of the transmission member, so that the transmission member can smoothly achieve the clutch with the first transmission groove and the second transmission groove, thereby improving the reliability of the radial clutch.

[0014] In the above torque overload protection transmission device, the limiter also includes an external thread section, the limiter head and the external thread section are arranged at both ends of the guide rod, and the limiter is fixed to the input connector or the output connector by threading through the external thread section. With such a design, the limiter is fixed by threading, which can not only facilitate the assembly of the limiter and ensure its connection reliability, but also realize the detachable connection of the limiter, thereby facilitating the subsequent separate replacement of the limiter, the elastic preload component and the transmission component; finally, by adjusting the screw-on length of the external thread section, the preload force of the elastic preload component on the transmission component can be adjusted, thereby realizing the adjustment of the predetermined torque, and does not affect the matching of the axial parts, and the adjustment is relatively convenient.

[0015] In the above torque overload protection transmission device, the limiter is fixedly connected to the bottom wall of the first transmission groove; or the limiter is fixedly connected to the bottom wall of the second transmission groove. Such a design can reduce the distance between the limiter head and the outer peripheral side of the input connector or the outer peripheral side of the output connector, that is, reduce the height of the limiter protruding from the outer peripheral side of the input connector or the outer peripheral side of the output connector, so as to make the overall structure more compact.

[0016] In the above torque overload protection transmission device, the limiter is a shaft sleeve, and the inner side surface of the shaft sleeve is provided with an avoidance groove at the position corresponding to the transmission member, and the bottom wall of the avoidance groove is provided with a radially penetrating mounting hole, and the limiter head is threadedly connected in the mounting hole, and the elastic preload component is located in the avoidance groove and preloaded between the limiter head and the transmission member. With such a design, the shaft sleeve can be used to provide a mounting position for the limiter head, and the shaft sleeve can also be used to achieve full shielding of the elastic preload component and shielding of at least part of the transmission member, thereby improving the appearance of the transmission device; in addition, the limiter head can be adjusted to achieve the adjustment of the preload force of the elastic preload component on the transmission member, thereby achieving the adjustment of the predetermined torque, and the coordination of the axial parts is not affected, and the adjustment is relatively convenient.

[0017] In the above torque overload protection transmission device, the transmission member is provided with a boss in the middle, one end of the elastic preload component is sleeved on the boss, and the other end is against the limit head. Such a design can not only realize the connection between the elastic preload component and the transmission member, but also make the preload force applied by the elastic preload component to the transmission member more uniform, thereby ensuring the reliability of the engagement between the axial ends of the transmission member and the first transmission groove and the second transmission groove.

[0018] In the torque overload protection transmission device, the transmission member is an arc-shaped transmission plate, and the outer side surface of the transmission plate is provided with a force-bearing surface, and the force-bearing surface is adapted to and abuts against the end surface of the elastic preload component. Adapting the force-bearing surface to the end surface of the elastic preload component can ensure that the elastic preload component and the force-bearing surface form a line contact or a surface contact rather than a point contact, thereby increasing the contact reliability between the elastic preload component and the transmission member, making the transmission member more evenly subjected to the preload force of the elastic preload component, and avoiding deflection.

[0019] In the above torque overload protection transmission device, the transmission member includes a first transmission part that can be engaged with the first transmission groove and a second transmission part that can be engaged with the second transmission groove, and the elastic preload component is a torsion spring, which is sleeved on the first transmission part and the second transmission part. With such a design, under a predetermined torque, the torsion spring holds the transmission member tightly so that the transmission member is engaged with the first transmission groove and the second transmission groove at the same time, and when an overload occurs, the overload torque will drive the transmission member to move radially outward and force the torsion spring to expand outward, thereby causing the transmission member to disengage from the first transmission groove and / or the second transmission groove, thereby achieving the purpose of cutting off torque transmission. In this technical solution, by setting the inner diameter of the torsion spring and the interference fit of the transmission member and the number of turns, the preload force can be adjusted, which not only has fewer parts but also is more convenient to maintain.

[0020] In the above torque overload protection transmission device, the outer diameter of the input connecting body is smaller than the outer diameter of the input transmission body, the outer diameter of the output connecting body is smaller than the outer diameter of the output transmission body, and the outer diameter of the input connecting body is equal to the outer diameter of the output connecting body. With such a design, the space between the input transmission body and the output transmission body and outside the outer peripheral side of the input connecting body can form an installation space for the elastic preload component, so as to further reduce the radial size of the transmission device; in addition, the transmission member can also be an axially extending arc-shaped sheet, so as to simplify the structure of the transmission member.

[0021] In the above torque overload protection transmission device, the transmission member has two first side surfaces extending along the rotation axis of the input connector, the first side surfaces are guide slopes, the distance between the two first side surfaces gradually increases toward the outer side surface of the transmission member, and the two side walls of the first transmission groove and the two side walls of the second transmission groove are respectively adapted to the two first side surfaces. With such a design, when clutching, slow separation and slow contact can be achieved, and the clutching is relatively smooth, thereby reducing noise, extending the service life of the product, and providing a better user experience.

[0022] In the above torque overload protection transmission device, the output connector has an output sleeve section sleeved on the outside of the input connector, the second transmission groove is radially penetrated through the output sleeve section, a second plug is provided in the second transmission groove, the elastic preload component is preloaded between the second plug and the transmission member, the first transmission groove and the second transmission groove are radially correspondingly arranged, and the torque output member forces the transmission member to move radially out of the first transmission groove when subjected to overload torque, so that the torque output member idles relative to the torque input member to implement overload protection. With such a design, the elastic preload component and the transmission member can be shielded by the output sleeve section to improve the product appearance; at the same time, the structure is relatively simple, and it is relatively convenient to use and maintain.

[0023] In the above torque overload protection transmission device, the input connector has an input sleeve section sleeved on the outside of the output connector, the first transmission groove is radially penetrated through the input sleeve section, a first plug is provided in the first transmission groove, the elastic preload component is preloaded between the first plug and the transmission member, the second transmission groove is radially corresponding to the first transmission groove, and the torque output member forces the transmission member to move radially out of the second transmission groove when subjected to overload torque, so that the torque output member idles relative to the torque input member to implement overload protection. With such a design, the elastic preload component and the transmission member can be shielded by the input sleeve section to improve the product appearance; at the same time, the structure is relatively simple, and it is relatively convenient to use and maintain.

[0024] In the above torque overload protection transmission device, the transmission member is a steel ball; or the transmission member is a transmission pin with a ball head. Such a design can make the clutch more stable, thereby reducing noise, extending the service life of the product, and providing a better user experience.

[0025] In the above torque overload protection transmission device, the torque input component is one of a gear, a sprocket, a pulley and a friction wheel; the torque output component is one of a gear, a sprocket, a pulley and a friction wheel.

[0026] The lifting drive system of the transfer machine includes a motor and a lifting device, the lifting device includes a drum and a rigging wound on the drum, the rotation of the drum drives the rigging to rise and fall, and the lifting drive system also includes a torque overload protection transmission device as described in any of the above technical solutions, the motor is driven by the torque input component, and the torque output component is driven by the drum. With such a design, after adopting the torque overload protection transmission device, the motor can be prevented from being damaged when the patient being transferred is overweight or overloaded, thereby extending the service life of the lifting drive system.

[0027] In the lifting drive system of the above-mentioned transfer machine, the lifting drive system further includes a first support frame and a second support frame spaced opposite to each other, the torque overload protection transmission device is assembled between the first support frame and the second support frame, the torque overload protection transmission device further includes a support shaft, the two ends of the support shaft are rotatably connected to the first support frame and the second support frame respectively, and the torque input component and the torque output component are rotatably mounted on the support shaft. Such a design can provide a mounting position for the torque input component and the torque output component on the support shaft, facilitating the coaxial assembly of the torque input component and the torque output component.

[0028] The transfer machine comprises a track mechanism and a main machine, wherein the main machine is connected to the track mechanism and can move along the track mechanism, and the main machine is equipped with the lifting drive system. With such a design, the lifting drive system with torque overload protection can prevent the motor from being damaged when the patient being transferred is overweight and overloaded, thereby extending the service life of the transfer machine.

[0029] These features and advantages of the present invention will be disclosed in detail in the following specific implementation manners and drawings.

Brief Description of the Drawings

[0030] The utility model is further described below in conjunction with the accompanying drawings:

[0031] Figure 1 This is a schematic diagram of the structure of the torque overload protection transmission device in the first embodiment of the utility model;

[0032] Figure 2 This is an explosion diagram of the torque overload protection transmission device in the first embodiment of the utility model;

[0033] Figure 3 It is an axial cross-sectional view of the torque overload protection transmission device under a predetermined torque in the first embodiment of the utility model;

[0034] Figure 4 This is a radial cross-sectional view of the torque overload protection transmission device in the first embodiment of the utility model;

[0035] Figure 5This is an axial cross-sectional view of the torque overload protection transmission device in the first embodiment of the utility model when it is overloaded;

[0036] Figure 6 This is an axial cross-sectional view of the torque overload protection transmission device in the second embodiment of the present utility model when it is overloaded;

[0037] Figure 7 This is a structural schematic diagram of the torque overload protection transmission device in the first embodiment of the utility model applied to the lifting drive system of the transfer machine;

[0038] Figure 8 This is a cross-sectional view of the torque overload protection transmission device in the first embodiment of the utility model applied to the lifting drive system of the transfer machine;

[0039] Fig. 9 This is a structural schematic diagram of the torque overload protection transmission device in the third embodiment of the present utility model applied to the lifting drive system of the transfer machine;

[0040] Fig.10 The torque overload protection transmission device in the third embodiment of the utility model is applied to the lifting drive system of the transfer machine. Figure 1 ;

[0041] Fig.11 The torque overload protection transmission device in the third embodiment of the utility model is applied to the lifting drive system of the transfer machine. Figure 2 ;

[0042] Fig.12 This is a structural schematic diagram of a torque overload protection transmission device in a fourth embodiment of the present utility model applied to a lifting drive system of a transfer machine;

[0043] Fig.13 This is a cross-sectional view of the torque overload protection transmission device in the fourth embodiment of the utility model applied to the lifting drive system of the transfer machine;

[0044] Fig.14 This is a structural schematic diagram of a torque overload protection transmission device in a fifth embodiment of the present utility model applied to a lifting drive system of a transfer machine;

[0045] Fig.15 The sectional view of the torque overload protection transmission device in the fifth embodiment of the utility model applied to the lifting drive system of the transfer machine Figure 1 ;

[0046] Fig.16 The sectional view of the torque overload protection transmission device in the fifth embodiment of the utility model applied to the lifting drive system of the transfer machine Figure 2 .

[0047] Reference numerals:

[0048] 100, torque input component; 110, input transmission body; 120, input connector; 121, first transmission groove; 200, torque output component; 210, output transmission body; 220, output connector; 221, second transmission groove; 222, output sleeve section; 223, second plug; 300, torque limiter; 310, elastic preload component; 320, transmission member; 321, force surface; 322, perforation; 32 3. First side surface; 324. Boss; 400. Support shaft; 500. Limiting member; 510. Limiting head; 520. Guide rod; 530. Avoidance groove; 531. Mounting hole; 600. Lifting device; 610. Roller; 620. Rigging; 700. First supporting frame; 800. Second supporting frame; 900. Rotating shaft; 910. Transmission gear; 1000. Positioning pin; 1100. Motor; 1110. Reducer. [Specific implementation method]

[0049] The utility model provides a torque overload protection transmission device, comprising:

[0050] a torque input component, comprising an input transmission body and an input connection body that rotate synchronously, the input transmission body receiving power input, the input connection body having a first transmission groove; and

[0051] a torque output component, comprising an output transmission body and an output connecting body that rotate synchronously, the output transmission body outputs power, and the output connecting body has a second transmission groove; and

[0052] A torque limiter, comprising an elastic preload component and a transmission member capable of moving in radial directions between a torque input component and a torque output component;

[0053] Wherein, the elastic preload component applies a preload force to the transmission member so that the transmission member remains engaged with the first transmission groove and the second transmission groove at a predetermined torque at the same time; when the torque output component is subjected to an overload torque, it forces the transmission member to move radially out of the first transmission groove and / or the second transmission groove so that the torque output component idles relative to the torque input component to implement overload protection.

[0054] The transmission member in the utility model can move radially along the torque input member and the torque output member. Under a predetermined torque, the transmission member maintains engagement with the first transmission groove and the second transmission groove under the preload force of the elastic preload member. At this time, the torque input member can transmit the torque to the torque output member through the transmission member to maintain the power transmission between the torque input member and the torque output member; and when the load is overloaded, the torque output member forces the transmission member to move radially outward when subjected to the overload torque, so that the transmission member disengages from the first transmission groove and / or the second transmission groove, thereby cutting off the torque transmission between the torque input member and the torque output member, allowing the torque output member to idle relative to the torque input member to implement overload protection, and the idling of the torque output member can quickly release the reverse torque applied by the load, thereby avoiding damage to the torque output member, and because the torque output member cannot transmit the reverse torque of the load to the torque input member, it also avoids damage to the torque input member due to the reverse torque of the excessive load, thereby avoiding damage to the transmission device and extending the service life of the transmission device.

[0055] The technical scheme of the embodiment of the utility model is explained and illustrated below in conjunction with the drawings of the embodiment of the utility model, but the following embodiments are only preferred embodiments of the utility model, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without making creative work all belong to the protection scope of the utility model. In addition, it should be understood that the following words indicating orientation or position relationship such as "up", "down", "left", "right", "longitudinal", "lateral", "inside", "outside", "vertical", "horizontal", "top", "bottom", etc. are only based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0056] Embodiment 1

[0057] like Figures 1 to 5As shown, the torque overload protection transmission device of this embodiment includes a torque input component 100, a torque output component 200 and a torque limiter 300, wherein the torque input component 100 includes a synchronously rotating input transmission body 110 and an input connecting body 120, the input transmission body 110 is used to receive power input, and the input connecting body 120 has a first transmission groove 121; the torque output component 200 includes a synchronously rotating output transmission body 210 and an output connecting body 220, the output transmission body 210 performs power output, and the output connecting body 220 has a second transmission groove 221; and the torque limiter 300 includes an elastic preload component 310 and a transmission member 320, the transmission member 320 can move in the radial direction of the torque input component 100 and the torque output component 200, when the transmission device is in a normal working state, the elastic preload component 310 applies a preload force to the transmission member 320, so that the transmission member 320 is simultaneously engaged with the first transmission groove 121 and the second transmission groove 221 under a predetermined torque, at this time, the torque input component 10 0 can transmit the torque to the torque output component 200 through the transmission member 320 to maintain the power transmission between the torque input component 100 and the torque output component 200; when the load is overloaded, the torque output component 200 forces the transmission member 320 to move radially outward when subjected to the overload torque, so that the transmission member 320 is disengaged from the first transmission groove 121 and / or the second transmission groove 221, thereby cutting off the torque transmission between the torque input component 100 and the torque output component 200, that is, cutting off the power transmission, so that the torque output component 200 is idling relative to the torque input component 100 to implement overload protection, and the idling of the torque output component 200 can quickly release the reverse torque applied by the load, thereby avoiding damage to the torque output component 200, and because the torque output component 200 cannot transmit the reverse torque of the load to the torque input component 100, it is also avoided that the torque input component 100 is subjected to the reverse torque of the excessive load and is damaged, thereby avoiding damage to the transmission device and extending the service life of the transmission device.

[0058] It should be noted that the transmission device in this embodiment is mainly used for a shifting machine, and the predetermined torque mentioned means that when the shifting machine is in normal working condition, the torque input component 100 and the torque output component 200 are simultaneously engaged with the first transmission groove 121 and the second transmission groove 221 through the transmission member 320 to realize the transmission torque. When the torque input component 100 outputs the working torque to the torque output component 200 through the transmission member 320, they are also subjected to the reverse torque from the load. In this embodiment, considering that the load exceeding the bearing limit of the shifting machine is likely to cause damage to the shifting machine, it is necessary to set a threshold value for the working torque that can keep the transmission member 320 engaged with the first transmission groove 121 and the second transmission groove 221 at the same time to realize the transmission of the torque input component 100 and the torque output component 200. When the shifting machine is working normally (not overloaded), The reverse torque of the load will not exceed the threshold value. Under the action of the elastic preload component 310, the transmission member 320 will maintain engagement with the first transmission groove 121 and the second transmission groove 221 at the same time to achieve the transmission of the working torque, thereby completing the transmission of power. Once an overload occurs, the reverse torque of the load exceeds the threshold value, which will drive the transmission member to overcome the force of the elastic preload component and disengage from the first transmission groove 121 and / or the second transmission groove 221 to disconnect the torque transmission and thereby achieve overload protection. At this time, the torque output component 200 is idling and cannot transmit the reverse torque of the load to the torque input component 100, thereby preventing the power component and the torque input component 100 from being damaged by excessive load reverse torque. The above threshold value is the "predetermined torque", which is provided by the preload force applied by the elastic preload component 310 to the transmission member 320.

[0059] Specifically, the input transmission body 110 and the input connecting body 120 in this embodiment are integrally formed and coaxially arranged, while the output transmission body 210 and the output connecting body 220 are integrally formed and coaxially arranged, and the input connecting body 120 and the output connecting body 220 are coaxially arranged and have the same outer diameter. Preferably, the torque overload protection transmission device also includes a support shaft 400, and the input connecting body 120 and the output connecting body 220 are rotatably mounted on the support shaft 400, and the torque input component 100 and the torque output component 200 are both axially positioned on the support shaft 400. Such a design can enable the support shaft 400 to provide an installation position for the torque input component 100 and the torque output component 200, thereby facilitating the coaxial assembly of the torque input component 100 and the torque output component 200.

[0060] The input connector 120 is arranged adjacent to the output connector 220, the first transmission groove 121 is arranged on the outer peripheral side of the input connector 120, the first transmission groove 121 is an arc groove extending axially from one end of the input connector 120 away from the input transmission body 110 toward the input transmission body 110, the second transmission groove 221 is arranged on the outer peripheral side of the output connector 220, the second transmission groove 221 is an arc groove extending axially from one end of the output connector 220 away from the output transmission body 210 toward the output transmission body 210, the first transmission groove 121 and the second transmission groove 221 have the same curvature, and the first transmission groove 121 and the second transmission groove 221 are arranged axially correspondingly along the rotation axis of the input connector 120, and The transmission member 320 is an arc-shaped transmission plate extending along the rotation axis of the input connector 120 and coaxial with the input connector 120. The curvature of the transmission plate is equal to the curvature of the first transmission groove 121 and the second transmission groove 221. The elastic preload component 310 is located on the side of the transmission member 320 away from the first transmission groove 121 and the second transmission groove 221. Under a predetermined torque, the transmission member 320 moves radially inward under the pressing force of the elastic preload component 310 to maintain engagement with the first transmission groove 121 and the second transmission groove 221 at the same time, that is, the two ends of the transmission member 320 are respectively located in the first transmission groove 121 and the second transmission groove 221 to realize torque transmission between the input connector 120 and the output connector 220. In the present embodiment, the design of the first transmission groove 121 and the second transmission groove 221 can facilitate the processing and forming of the first transmission groove 121 and the second transmission groove 221, thereby reducing the processing difficulty of the input connector 120 and the output connector 220, and further reducing the processing cost; at the same time, since there is enough space on the side of the transmission member 320 away from the first transmission groove 121 and the second transmission groove 221, the elastic pre-tensioning component 310 is arranged on the side of the transmission member 320 away from the first transmission groove 121 and the second transmission groove 221, which can facilitate the assembly of the elastic pre-tensioning component 310.

[0061] The elastic preload component 310 in this embodiment is preferably a spring, such as a coil spring, and the input connector 120 is connected to a synchronously rotating stopper 500, which includes a stopper head 510, and the spring is preloaded between the stopper head 510 and the transmission member 320. With such a design, the spring can be compressed by the stopper head 510, so that the spring keeps applying a preload force to the transmission member 320, so that the transmission member 320 is simultaneously engaged with the first transmission groove 121 and the second transmission groove 221 under a predetermined torque.

[0062] It can be understood that in other embodiments of the utility model, the elastic preload component is not limited to the coil spring. According to actual needs, one of the butterfly spring and rubber spring or a combination thereof can also be selected. For example, a rubber spring can be connected in parallel inside the coil spring. The rubber spring can provide a better shock absorbing effect and is not easy to cause mechanical damage. The rubber spring has a small elastic modulus and has a large elastic deformation after being loaded, which will provide a smoother buffering effect.

[0063] Since the outer side surface of the transmission sheet is an arc surface, and the end surface of the spring is a plane, point contact will be formed after the two are abutted against each other. In this way, when the spring presses the transmission member 320 radially inward, the transmission member 320 is unevenly stressed and deflected, and cannot smoothly engage with the first transmission groove 121 and the second transmission groove 221. In order to avoid the above situation, in this embodiment, a force-bearing surface 321 is provided on the side of the transmission sheet facing the spring (the outer side surface of the transmission sheet), and the force-bearing surface 321 is a plane that is adapted and abutted with the end surface of the spring. Since the end surface of the spring is a plane, the force-bearing surface 321 is adapted to the end surface of the spring, so that the spring and the force-bearing surface 321 form a line contact rather than a point contact, thereby increasing the contact reliability between the spring and the transmission member 320, making the transmission member 320 more evenly subjected to the spring preload force, avoiding deflection, and thus ensuring that the transmission member 320 can smoothly engage with the first transmission groove 121 and the second transmission groove 221.

[0064] Preferably, the stopper 500 is fixedly connected to the input connector 120 and extends along the radial direction thereof, and the stopper 500 includes a guide rod 520, a through hole 322 is provided on the transmission member 320, the guide rod 520 is arranged through the through hole 322, and the spring is sleeved on the guide rod 520. With such a design, the expansion and contraction of the spring and the radial movement of the transmission member 320 can be guided by the guide rod 520 to avoid deviation during the expansion and contraction of the spring, and the stability of the radial movement of the transmission member 320 is ensured, so that the transmission member 320 can smoothly achieve clutch with the first transmission groove 121 and the second transmission groove 221, thereby improving the reliability of radial clutch.

[0065] In order to facilitate the fixed connection of the limiter 500 to the input connector 120, the limiter 500 in this embodiment is a screw, which also includes an external thread section. The limiter head 510 and the external thread section are arranged at both ends of the guide rod 520, and the limiter 500 is threadedly connected and fixed to the input connector 120 through the external thread section. With such a design, the limiter 500 is fixed by thread connection, which can not only facilitate the assembly of the limiter 500 and ensure its connection reliability, but also realize the detachable connection of the limiter 500, and then facilitate the subsequent replacement of the limiter 500, the elastic preload component 310 and the transmission component 320 separately; finally, by adjusting the screw connection length of the external thread section, the preload force of the spring on the transmission component 320 can be adjusted, thereby realizing the adjustment of the predetermined torque, and the matching of the axial parts is not affected, and the adjustment is more convenient.

[0066] It can be understood that in other embodiments of the present invention, the limiting member can also be welded and fixed on the input connector.

[0067] Preferably, the stopper 500 is fixedly connected to the bottom wall of the first transmission groove 121. With such a design, when the radial height of the stopper 500 remains unchanged, the distance between the stopper head and the outer peripheral side of the input connector 120 can be reduced, that is, the height of the stopper 500 protruding from the outer peripheral side of the input connector 120 can be reduced, so that the overall structure is more compact.

[0068] Preferably, in this embodiment, the outer diameter of the input connecting body 120 is smaller than the outer diameter of the input transmission body 110, and the outer diameter of the output connecting body 220 is smaller than the outer diameter of the output transmission body 210. Since the outer diameter of the input connecting body 120 is equal to the outer diameter of the output connecting body 220, the space between the input transmission body 110 and the output transmission body 210 and outside the outer peripheral side of the input connecting body 120 can form an installation space for the elastic preload component 310 to further reduce the radial dimension of the transmission device.

[0069] Finally, the transmission member 320 in this embodiment has two first side surfaces 323 extending along the rotation axis of the input connector 120, the first side surfaces 323 are guide slopes, the distance between the two first side surfaces 323 gradually increases toward the outer side surface direction of the transmission member 320, and the two side walls of the first transmission groove 121 and the two side walls of the second transmission groove 221 are respectively adapted to the two first side surfaces 323. With such a design, in the case of overload, the transmission member 320 can be smoothly and slowly separated from the first transmission groove 121 and / or the second transmission groove 221, and when the transmission member 320 is radially corresponding to the first transmission groove 121 and the second transmission groove 221 again, the transmission member 320 can be smoothly and slowly inserted into the first transmission groove 121 and the second transmission groove 221, that is, when clutching, slow separation and slow contact can be achieved, and the clutching is relatively stable, thereby reducing noise, extending the service life of the product, and providing a better user experience.

[0070] It should be noted that when the transmission device of this embodiment is used, when an overload occurs, the output connector 220 rotates under the action of the load reverse torque. Figure 5 As shown, if the output connector 220 forces the transmission member 320 to disengage from the first transmission groove 121 and the second transmission groove 221 at the same time, the torque transmission can be disconnected to achieve overload protection; if the output connector 220 only forces the part of the transmission member 320 that cooperates with the second transmission groove 221 to disengage from the second transmission groove 221, the torque transmission can also be disconnected to achieve overload protection; if the output connector 220 initially forces the part of the transmission member 320 that cooperates with the first transmission groove 121 to disengage from the first transmission groove 121, while the other part of the transmission member 320 is still engaged with the second transmission groove 221, since the transmission member 320 is inclined at this time, the transmission member 320 and the second transmission groove 221 are not connected. The contact area of ​​the groove 221 is small, and the input connector 120 can easily push the transmission member 320 out to disengage it from the second transmission groove 221 by driving the transmission member 320 to rotate through the limit member 500, that is, finally the transmission member 320 is kept disengaged from the first transmission groove 121 and the second transmission groove 221 at the same time to disconnect the transmission of torque and thus achieve overload protection. That is, during the actual use of the transmission device of this embodiment, whether the transmission member 320 is only disengaged from the second transmission groove 221, or first disengaged from the first transmission groove 121 and then from the second transmission groove 221, or is disengaged from the first transmission groove 121 and the second transmission groove 221 at the same time, the transmission of torque can be disconnected to achieve overload protection. In the case of overload, although the rotation of the torque output component 200 will cause the transmission member 320 to engage with the first transmission groove 121 and the second transmission groove 221 again, the reverse torque of the load will still force the transmission member 320 to overcome the force of the elastic preload component 310 and disengage from the first transmission groove 121 and / or the second transmission groove 221 to disconnect the torque transmission, that is, during the entire idling process of the torque output component 200, although there will be continuous clutching, the reverse torque of the load will not be transmitted to the torque input component 100, thereby achieving overload protection.

[0071] The torque input component 100 in this embodiment is one of a gear, a sprocket, a pulley and a friction wheel, that is, the input transmission body 110 is one of a gear transmission body, a sprocket transmission body, a pulley transmission body and a friction wheel transmission body, and the torque output component 200 is one of a gear, a sprocket, a pulley and a friction wheel, that is, the output transmission body 210 is one of a gear transmission body, a sprocket transmission body, a pulley transmission body and a friction wheel transmission body.

[0072] It is understandable that in other embodiments of the present invention, the outer diameters of the input connector and the output connector may not be equal. In this case, the transmission member may be made into an arc-shaped bending piece to match the first transmission groove and the second transmission groove.

[0073] like Figure 7 and Figure 8 As shown, this embodiment also discloses a lifting drive system of a transfer machine, including a lifting device 600 and a motor 1100. The lifting device 600 includes a drum 610 and a rigging 620 wound on the drum 610. The rotation of the drum 610 drives the rigging 620 to rise and fall. The lifting drive system also includes the torque overload protection transmission device described in the first embodiment. The motor 1100 is transmitted to the torque input component 100, and the torque output component 200 is transmitted to the drum 610. The load on the transfer machine will generate a reverse torque on the torque output component 200 through the drum 610. With such a design, after adopting the torque overload protection transmission device, the motor 1100 can be prevented from being damaged when the patient being transferred is overweight or overloaded, thereby extending the service life of the lifting drive system.

[0074] The lifting drive system further includes a first support frame 700 and a second support frame 800 which are spaced apart from each other, and a torque overload protection transmission device is installed between the first support frame 700 and the second support frame 800, that is, both ends of the support shaft 400 are rotatably connected to the first support frame 700 and the second support frame 800 through bearings, and there are two motors 1100, which are respectively located on the outside of the first support frame 700 and the second support frame 800, and the output end of each motor 1100 is connected to a reduction box 1110, and a rotating shaft is rotatably installed between the first support frame 700 and the second support frame 800. 900, both ends of the rotating shaft 900 are connected to two reduction boxes 1110 respectively, a synchronously rotating transmission gear 910 is installed on the rotating shaft 900, the input transmission body 110 and the output transmission body 210 are gears, the transmission gear 910 is meshed and connected with the input transmission body 110, and the output transmission body 210 is meshed with the gear ring on the drum 610, so that the motor 1100 transmits the torque to the torque input component 100 through the reduction box 1110, the rotating shaft 900 and the transmission gear 910, and the torque output component 200 transmits the torque to the drum 610 through the output transmission body 210 and the gear ring on the drum 610. When in use, one of the motors 1100 can drive the rotating shaft 900 to rotate, or the two motors 1100 can drive the rotating shaft 900 to rotate at the same time.

[0075] It can be understood that in other embodiments of the present invention, the number of the motor and the reduction gearbox can also be one, and the motor is connected to the rotating shaft through the reduction gearbox to drive the rotating shaft to rotate.

[0076] Embodiment 2

[0077] like Figure 6As shown, compared with the first embodiment, the difference of this embodiment is that the stopper 500 is fixed to the outer peripheral side of the output connector 220 by screw connection or welding and extends along its radial direction, and the stopper 500 is arranged through the transmission member 320, and its structure can be set with reference to the first embodiment, and will not be described in detail here. Preferably, the stopper 500 is fixedly connected to the bottom wall of the second transmission groove 221. Such a design can reduce the height of the stopper 500 protruding from the outer peripheral side of the output connector 220, so as to make the overall structure more compact.

[0078] When an overload occurs, the output connector 220 rotates under the action of the load reverse torque. If the output connector 220 forces the transmission member 320 to disengage from the first transmission groove 121 and the second transmission groove 221 at the same time, the torque transmission can be disconnected to achieve overload protection; if the output connector 220 only forces the part of the transmission member 320 that cooperates with the first transmission groove 121 to disengage from the first transmission groove 121, the torque transmission can also be disconnected to achieve overload protection; if the output connector 220 initially forces the part of the transmission member 320 that cooperates with the second transmission groove 221 to disengage from the second transmission groove 221, while the other part of the transmission member 320 is still matched with the first transmission groove 121, since the transmission member 320 is tilted at this time, Therefore, the contact area between the transmission member 320 and the first transmission groove 121 is relatively small, and the output connector 220 can easily push the transmission member 320 out to disengage it from the first transmission groove 121 by driving the transmission member 320 to rotate through the limit member 500, that is, finally the transmission member 320 is kept disengaged from the first transmission groove 121 and the second transmission groove 221 at the same time to disconnect the transmission of torque and thus achieve overload protection. That is, during the actual use of the transmission device of this embodiment, whether the transmission member 320 is only disengaged from the first transmission groove 121, or first disengaged from the second transmission groove 221 and then from the first transmission groove 121, or is disengaged from the first transmission groove 121 and the second transmission groove 221 at the same time, the transmission of torque can be disconnected to achieve overload protection.

[0079] Embodiment 3

[0080] like Figures 9 to 11As shown, compared with the first embodiment, the difference of this embodiment is that: the structure of the limit member 500 in this embodiment is different, which is a sleeve sleeved on the outside of the output connector 220, the limit member 500 is provided with a radially penetrating through hole, and the positioning pin 1000 passes through the through hole and is inserted into the output connector 220, so as to realize the synchronous rotation of the limit member 500 and the output connector 220, wherein the inner side surface of the sleeve and the portion corresponding to the transmission member 320 are provided with an avoidance groove 530, the transmission member 320 can enter the avoidance groove 530, the bottom wall of the avoidance groove 530 is provided with a radially penetrating mounting hole 531, the limit head 510 is threadedly connected in the mounting hole 531, the elastic pre-tightening component 310 is located in the avoidance groove 530 and is pre-tightened between the limit head 510 and the transmission member 320, and the elastic pre-tightening component 310 can be one of a butterfly spring, a coil spring, and a rubber spring or a combination thereof. With such a design, the shaft sleeve can be used to provide a mounting position for the limit head 510, and can also be used to completely cover the elastic preload component 310 and at least partially cover the transmission component 320, thereby improving the appearance of the transmission device; in addition, the preload force of the elastic preload component 310 on the transmission component 320 can be adjusted by adjusting the limit head 510, thereby achieving the adjustment of the predetermined torque without affecting the fit of the axial parts, and the adjustment is relatively convenient.

[0081] In addition, different from the first and second embodiments, in this embodiment, a boss 324 is provided in the middle of the outer side of the transmission member 320, one end of the elastic preload component 310 is sleeved on the boss 324, and the other end is against the stopper 510. Such a design can not only realize the connection between the elastic preload component 310 and the transmission member 320, but also make the preload force applied by the elastic preload component 310 to the transmission member 320 more uniform, thereby ensuring the reliability of the engagement between the axial ends of the transmission member 320 and the first transmission groove 121 and the second transmission groove 221.

[0082] It should be noted that when the load is overloaded, the output connector 220 rotates under the action of the load reverse torque. If the output connector 220 forces the transmission member 320 to disengage from the first transmission groove 121 and the second transmission groove 221 at the same time, the torque transmission can be disconnected to achieve overload protection; if the output connector 220 only forces the part of the transmission member 320 that cooperates with the first transmission groove 121 to disengage from the first transmission groove 121, the torque transmission can also be disconnected to achieve overload protection; if the output connector 220 initially forces the part of the transmission member 320 that cooperates with the second transmission groove 221 to disengage from the second transmission groove 221, while the other part of the transmission member 320 is still cooperated with the first transmission groove 121, since the transmission member 320 is inclined at this time The output connector 220 drives the transmission member 320 to rotate through the limit member 500, so that the transmission member 320 can be easily pushed out to disengage from the first transmission groove 121, that is, the transmission member 320 is finally kept disengaged from the first transmission groove 121 and the second transmission groove 221 at the same time, so as to disconnect the transmission of torque and thus achieve overload protection. That is, during the actual use of the transmission device of this embodiment, whether the transmission member 320 is only disengaged from the first transmission groove 121, or is first disengaged from the second transmission groove 221 and then from the first transmission groove 121, or is disengaged from the first transmission groove 121 and the second transmission groove 221 at the same time, the transmission of torque can be disconnected and thus achieve overload protection.

[0083] It is understandable that in other embodiments of the present invention, the limit member is provided with a non-circular hole, such as a D-shaped hole, a square hole, a hexagonal hole, etc., and the output connector has a non-circular segment adapted to the non-circular hole, so that the limit member and the output connector can also rotate synchronously.

[0084] It can be understood that in other embodiments of the present invention, the sleeve can also be sleeved on the outside of the input connecting body, the sleeve is provided with a radially penetrating through hole, and the positioning pin is inserted into the input connecting body through the through hole to realize the synchronous rotation of the sleeve and the input connecting body, wherein the inner side surface of the sleeve and the portion corresponding to the transmission member are provided with an avoidance groove, the bottom wall of the avoidance groove is provided with a radially penetrating mounting hole, the limit head is threadedly connected in the mounting hole, the elastic pre-tightening component is located in the avoidance groove and pre-tightened between the limit head and the transmission member, the elastic pre-tightening component can be one of a butterfly spring, a coil spring, a rubber spring or a combination thereof, and its overload protection process can refer to the above embodiments and will not be described in detail here.

[0085] Embodiment 4

[0086] like Fig.12 and Fig.13As shown, compared with the first to third embodiments, the difference of this embodiment is that the transmission member 320 includes a first transmission part that can be engaged with the first transmission groove 121 and a second transmission part that can be engaged with the second transmission groove 221, and the elastic preload component 310 is a torsion spring, which is sleeved on the first transmission part and the second transmission part. With such a design, under a predetermined torque, the torsion spring holds the transmission member 320 tightly so that the transmission member 320 is simultaneously engaged with the first transmission groove 121 and the second transmission groove 221, and when overload occurs, the overload torque drives the transmission member 320 to move radially outward and forces the torsion spring to expand outward, so that the transmission member 320 is simultaneously disengaged from the first transmission groove 121 and the second transmission groove 221, so as to achieve the purpose of cutting off the torque transmission. In this embodiment, by setting the inner diameter of the torsion spring and the interference of the transmission member 320 and the number of turns of the torsion spring, the adjustment of the preload force can be achieved, which not only has fewer parts, but also is more convenient for maintenance.

[0087] Embodiment 5

[0088] like Figures 14 to 16As shown, compared with embodiments one to four, the difference of this embodiment is that: the output connector 220 has an output socket section 222 socketed on the outside of the input connector 120, the second transmission groove 221 is radially arranged to penetrate the output socket section 222, and a plurality of second transmission grooves 221 are circumferentially spaced on the output socket section 222, a second plug 223 is provided in the second transmission groove 221, and the second plug 223 is threadedly connected to the second transmission groove 221, the transmission member 320 is a steel ball, and the elastic preload component 310 is preloaded between the second plug 223 and the transmission member 320, the first transmission groove 121 and the second transmission groove 221 are radially correspondingly arranged, that is, the first transmission groove 121 is located radially inside the second transmission groove 221, and the first transmission groove 121 is an arc-shaped groove or a conical groove. Under normal working conditions, the elastic preload component 310 applies a preload force to the transmission member 320 so that the transmission member 320 partially extends out of the second transmission groove 221 and remains engaged with the first transmission groove 121 under a predetermined torque, so that torque transmission is achieved between the torque input component 100 and the torque output component 200. When the load is overloaded, the torque output component 200 will force the transmission member 320 to move radially outward to disengage from the first transmission groove 121 after being subjected to the reverse torque applied by the load, so as to cut off the torque transmission and make the torque output component 200 idle relative to the torque input component 100 to implement overload protection. With such a design, the elastic preload component 310 and the transmission member 320 can be shielded by the output sleeve section 222 to enhance the product appearance; at the same time, the structure is relatively simple, and it is relatively convenient to use and maintain; in addition, the preload force of the elastic preload component 310 on the transmission member 320 can be adjusted by adjusting the limit head 510, thereby achieving the adjustment of the predetermined torque without affecting the fit of the axial parts, and the adjustment is relatively convenient; finally, the transmission member 320 is set as a steel ball, and the first transmission groove 121 is an arc-shaped groove or a conical groove, which can also make the clutch smoother, thereby reducing noise, extending the service life of the product, and providing a better user experience.

[0089] It can be understood that in other embodiments of the present invention, the transmission member may also be a transmission pin of a ball head.

[0090] It can be understood that in other embodiments of the utility model, the input connector has an input sleeve section sleeved on the outside of the output connector, the first transmission groove is radially penetrated through the input sleeve section, a first plug is provided in the first transmission groove, the first plug is threaded in the first transmission groove, the elastic preload component is preloaded between the first plug and the transmission member, the second transmission groove is radially corresponding to the first transmission groove, and the torque output member forces the transmission member to move radially out of the second transmission groove when subjected to overload torque, so that the torque output member is idling relative to the torque input member to implement overload protection. With such a design, the elastic preload component and the transmission member can be shielded by the input sleeve section to improve the product appearance; at the same time, the structure is relatively simple, and it is relatively convenient to use and maintain.

[0091] Embodiment 6

[0092] The present embodiment also discloses a transfer machine, including a track mechanism and a host, the host is connected to the track mechanism and can move along the track mechanism, the host is equipped with the lifting drive system described in any of the above embodiments, the track mechanism adopts a conventional guide rail and is installed on the ceiling, and the host can move along the guide rail; wherein the people and objects that need to be moved and lifted act on the rigging 620 of the lifting drive system, thereby applying a load to the torque output component 200 of the lifting drive system, and the load will generate a reverse torque on the torque output component 200, and when the load is small and the transfer machine works normally, the reverse torque of the load will not exceed When the predetermined torque is exceeded, the transmission member 320 remains engaged with the first transmission groove 121 and the second transmission groove 221 at the same time and transmits the working torque, so as to realize the lifting and lowering of objects or people on the rigging 620, and the main machine can move along the track mechanism, that is, the main machine can slide on the ceiling, so as to realize the transfer of objects or people on the rigging 620; once the load is overloaded, the torque output component 200 forces the transmission member 320 to move radially out of the first transmission groove 121 and / or the second transmission groove 221 when subjected to the overload torque, so that the torque output component 200 idles relative to the torque input component 100 to implement overload protection.

[0093] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Those skilled in the art should understand that the utility model includes but is not limited to the contents described in the drawings and the above specific implementation. Any modification that does not deviate from the functional and structural principles of the utility model will be included in the scope of the claims.

Claims

1. Torque overload protection transmission device, characterized in that: include: A torque input component, comprising a synchronously rotating input transmission body and an input connecting body, wherein the input transmission body receives power input and the input connecting body has a first transmission groove; as well as A torque output component, comprising an output transmission body and an output connecting body that rotate synchronously, the output transmission body outputs power, and the output connecting body has a second transmission groove; as well as A torque limiter, comprising an elastic preload component and a transmission member capable of moving in radial directions between a torque input component and a torque output component; Wherein, the elastic preload component applies a preload force to the transmission member so that the transmission member remains engaged with the first transmission groove and the second transmission groove at a predetermined torque at the same time; when the torque output component is subjected to an overload torque, it forces the transmission member to move radially out of the first transmission groove and / or the second transmission groove so that the torque output component idles relative to the torque input component to implement overload protection.

2. The torque overload protection transmission device according to claim 1, characterized in that: The input connector is coaxially arranged with the output connector, the first transmission groove is arranged on the outer peripheral side of the input connector, the second transmission groove is arranged on the outer peripheral side of the output connector, and the first transmission groove and the second transmission groove are axially correspondingly arranged along the rotation axis of the input connector, and the elastic preload component is located on the side of the transmission member away from the first transmission groove and the second transmission groove to apply a preload force to the transmission member.

3. The torque overload protection transmission device according to claim 2, characterized in that: The input connector or the output connector is connected with a synchronously rotating limiter, the limiter comprises a limiter head, and the elastic pre-tightening component is pre-tightened between the limiter head and the transmission member.

4. The torque overload protection transmission device according to claim 3, characterized in that: The limiting member is fixedly connected to the input connector or the output connector and extends along the radial direction thereof. The limiting member comprises a guide rod that penetrates the transmission member, and the elastic pre-tightening member is sleeved on the guide rod.

5. The torque overload protection transmission device according to claim 4, characterized in that: The limiting member further comprises an external thread section, the limiting head and the external thread section are arranged at two ends of the guide rod, and the limiting member is threadedly connected and fixed to the input connector or the output connector via the external thread section.

6. The torque overload protection transmission device according to claim 4, characterized in that: The limiting member is fixedly connected to the bottom wall of the first transmission groove; or the limiting member is fixedly connected to the bottom wall of the second transmission groove.

7. The torque overload protection transmission device according to claim 3, characterized in that: The limiting member is a shaft sleeve, and an avoidance groove is provided on the inner side surface of the shaft sleeve corresponding to the transmission member. The bottom wall of the avoidance groove is provided with a radially through-going mounting hole. The limiting head is threadedly connected in the mounting hole. The elastic pre-tightening component is located in the avoidance groove and pre-tightened between the limiting head and the transmission member.

8. The torque overload protection transmission device according to claim 7, characterized in that: The transmission member is provided with a boss in the middle part, one end of the elastic pre-tightening component is sleeved on the boss, and the other end is against the limit head.

9. The torque overload protection transmission device according to claim 3, characterized in that: The transmission member is an arc-shaped transmission plate, and the outer side surface of the transmission plate is provided with a force-bearing surface, and the force-bearing surface is adapted to and abuts against the end surface of the elastic preload component.

10. The torque overload protection transmission device according to claim 2, characterized in that: The transmission member comprises a first transmission part engageable with the first transmission groove and a second transmission part engageable with the second transmission groove, and the elastic preload component is a torsion spring, which is sleeved on the first transmission part and the second transmission part.

11. The torque overload protection transmission device according to any one of claims 2 to 10, characterized in that: The outer diameter of the input connecting body is smaller than the outer diameter of the input transmission body, the outer diameter of the output connecting body is smaller than the outer diameter of the output transmission body, and the outer diameter of the input connecting body is equal to the outer diameter of the output connecting body.

12. The torque overload protection transmission device according to any one of claims 2 to 10, characterized in that: The transmission member has two first side surfaces extending along the rotation axis of the input connector, the first side surfaces are guide slopes, the distance between the two first side surfaces gradually increases toward the outer side surface of the transmission member, and the two side walls of the first transmission groove and the two side walls of the second transmission groove are respectively adapted to the two first side surfaces.

13. The torque overload protection transmission device according to claim 1, characterized in that: The output connecting body has an output socket section that is socketed on the outside of the input connecting body, the second transmission groove is arranged radially through the output socket section, a second plug is arranged in the second transmission groove, the elastic preload component is preloaded between the second plug and the transmission member, the first transmission groove and the second transmission groove are arranged radially correspondingly, and the torque output component forces the transmission member to move radially out of the first transmission groove when subjected to an overload torque, so that the torque output component idles relative to the torque input component to implement overload protection.

14. The torque overload protection transmission device according to claim 1, characterized in that: The input connecting body has an input sleeve section sleeved on the outside of the output connecting body, the first transmission groove is arranged radially through the input sleeve section, a first plug is arranged in the first transmission groove, the elastic pre-tightening component is pre-tightened between the first plug and the transmission member, the second transmission groove is arranged radially corresponding to the first transmission groove, and the torque output component forces the transmission member to move radially out of the second transmission groove when subjected to an overload torque, so that the torque output component idles relative to the torque input component to implement overload protection.

15. The torque overload protection transmission device according to claim 13 or 14, characterized in that: The transmission member is a steel ball; or the transmission member is a transmission pin with a ball head.

16. The torque overload protection transmission device according to claim 1, characterized in that: The torque input component is one of a gear, a sprocket, a pulley and a friction wheel; the torque output component is one of a gear, a sprocket, a pulley and a friction wheel.

17. A lifting drive system for a transfer machine, comprising a motor and a lifting device, wherein the lifting device comprises a drum and a rigging wound on the drum, wherein the rotation of the drum drives the rigging to rise and fall, and wherein: The lifting drive system further comprises a torque overload protection transmission device as claimed in any one of claims 1 to 16, wherein the motor is driven by the torque input component, and the torque output component is driven by the drum.

18. The lifting drive system of the transfer machine according to claim 17, characterized in that: The lifting drive system also includes a first support frame and a second support frame that are spaced apart from each other, the torque overload protection transmission device is assembled between the first support frame and the second support frame, the torque overload protection transmission device also includes a support shaft, both ends of the support shaft are rotatably connected to the first support frame and the second support frame respectively, and the torque input component and the torque output component are rotatably mounted on the support shaft.

19. A transfer machine, comprising a track mechanism and a host, wherein the host is connected to the track mechanism and can move along the track mechanism, characterized in that: The main machine is equipped with the lifting drive system according to claim 17.

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