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

Abstract

The utility model discloses a mechanical overload protection transmission device which comprises a transmission shaft provided with a first transmission groove; the transmission wheel is provided with a through hole matched with the transmission shaft, the transmission shaft penetrates through the through hole, and a second transmission groove corresponding to the first transmission groove in the radial direction is formed in the transmission wheel; the torque limiter is arranged in the first transmission groove and comprises a transmission key and an elastic pre-tightening component, and the elastic pre-tightening component applies pre-tightening force to the transmission key, so that the transmission key extends out of the first transmission groove and is kept in radial joint with the second transmission groove under preset torque; when the transmission wheel or the transmission shaft is subjected to overload torque, the transmission key is forced to be separated from the second transmission groove, and the transmission wheel idles relative to the transmission shaft to implement overload protection. In addition, the utility model further discloses a lifting driving system of the shifting machine adopting the mechanical overload protection transmission device and the shifting machine.

Description

[Technical field]

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

[0002] The transmission device on the existing transfer machine generally includes a transmission shaft and a transmission wheel. The transmission wheel has a through hole adapted to the transmission shaft, the transmission shaft is provided with a transmission key, and the transmission wheel is provided with a transmission groove. The transmission key is inserted in the transmission groove to achieve torque transmission between the transmission wheel and the transmission shaft and thus synchronize rotation. When the transmission wheel or the transmission shaft is overloaded, the load will apply excessive reverse torque to the transmission wheel or the transmission shaft. The excessive reverse torque may not only cause the transmission key to break, resulting in the inability to transmit torque between the transmission wheel and the transmission shaft, thereby causing damage to the transmission device; it may also cause damage to the power components connected to 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 mechanical 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 transmission wheel and the transmission shaft when the load is overloaded, so that the transmission wheel can idle relative to the transmission shaft to achieve overload protection, avoid damage to the transmission device and power components, and extend 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] Mechanical overload protection transmission device, including:

[0006] a transmission shaft having a first transmission groove; and

[0007] A transmission wheel having a through hole adapted to the transmission shaft, the transmission shaft passing through the through hole, and a second transmission groove radially corresponding to the first transmission groove being provided on the transmission wheel; and

[0008] The torque limiter built into the first transmission groove includes a transmission key and an elastic pre-tightening component. The elastic pre-tightening component applies a pre-tightening force to the transmission key, so that the transmission key extends out of the first transmission groove and maintains radial engagement with the second transmission groove under a predetermined torque. When the transmission wheel or the transmission shaft is subjected to an overload torque, the transmission key is forced to disengage from the second transmission groove, and the transmission wheel idles relative to the transmission shaft to implement overload protection.

[0009] When the transmission device in the utility model is in normal working state (that is, the load is not overloaded), the transmission key extends out of the first transmission groove under the preload force of the elastic preload component and maintains radial engagement with the second transmission groove under a predetermined torque. At this time, the transmission wheel and the transmission shaft can realize torque transmission through the transmission key, that is, power transmission; and when the load is overloaded, the transmission wheel or the transmission shaft forces the transmission key to disengage from the second transmission groove when subjected to the overload torque, thereby cutting off the torque transmission between the transmission wheel and the transmission shaft, so that the transmission wheel idles relative to the transmission shaft to implement overload protection, thereby avoiding the transmission wheel or the transmission bearing from being damaged by the reverse torque of excessive load, that is, avoiding damage to the transmission device, extending the service life of the transmission device, and also avoiding damage to the power components connected to the transmission device.

[0010] In the above-mentioned mechanical overload protection transmission device, the transmission key includes a transmission section that can be inserted into the second transmission groove, and the transmission section includes two transmission surfaces extending along the axis of the transmission shaft and arranged opposite to each other, and the distance between the two transmission surfaces gradually decreases radially outward along the transmission shaft, and the side wall of the second transmission groove is adapted to the transmission surface. With such a design, when the transmission wheel or the transmission shaft is subjected to overload torque, the design of the transmission surface can enable the transmission section to smoothly and slowly disengage from the second transmission groove, so as to achieve the purpose of cutting off torque transmission, avoiding the problem that the transmission section is stuck and cannot smoothly disengage from the second transmission groove; at the same time, it can also ensure that when the transmission key is radially corresponding to the second transmission groove again, the end with the smaller distance between the two transmission surfaces can be inserted into the second transmission groove for pre-guiding, so as to facilitate the subsequent transmission key to be smoothly inserted into the second transmission groove, and the clutch is relatively smooth, thereby reducing noise, making the user experience better, and increasing the service life of the product.

[0011] In the above mechanical overload protection transmission device, the first transmission groove includes a constricted portion, the transmission section extends out of the first transmission groove through the constricted portion, the inner side surface of the constricted portion includes limiting surfaces spaced along the circumference of the transmission shaft, the distance between the two limiting surfaces gradually decreases along the radial outward direction, and the minimum distance between the two limiting surfaces is less than the maximum distance between the two transmission surfaces. Such a design can prevent the transmission section from radially outwardly escaping from the first transmission groove, thereby improving the installation reliability of the transmission key and the transmission shaft.

[0012] In the above mechanical overload protection transmission device, the transmission key further includes a guide section, the guide section abuts against the elastic preload component, and the first transmission groove further includes a guide portion, the guide portion cooperates with the guide section to guide the guide section to move along the radial direction of the transmission shaft. In this design, the smoothness of the radial movement of the transmission key is ensured by the cooperation between the guide portion and the guide section, and the transmission key is prevented from being deflected and stuck during radial movement, and unable to smoothly extend or retract the first transmission groove and disengage from the second transmission groove, thereby increasing the difficulty of assembly and failing to cut off torque transmission in time when overloaded.

[0013] In the above mechanical overload protection transmission device, the transmission surface is a transmission inclined surface that is radially outward and inclined toward another transmission surface; or the transmission surface is a transmission arc surface that is convex in a direction away from another transmission surface. Such a design has a simple structure and is conducive to the processing and forming of the transmission key.

[0014] In the above-mentioned mechanical overload protection transmission device, the transmission key is a ball pin, and the second transmission groove matches the ball head of the ball pin; or the transmission key is a transmission ball, and the second transmission groove matches the transmission ball. Such a design is not only simple in structure, but also can make the transmission key smoothly and slowly disengage from the second transmission groove when the transmission wheel or the transmission shaft is subjected to overload torque, so as to achieve the purpose of cutting off torque transmission, avoiding the problem that the transmission key is stuck and cannot smoothly disengage from the second transmission groove, and at the same time can ensure that when the transmission key is radially corresponding to the second transmission groove again, the transmission key can be smoothly and slowly inserted into the second transmission groove, and the clutch is relatively smooth, thereby reducing noise, making the user experience better, and increasing the service life of the product.

[0015] In the above mechanical overload protection transmission device, the transmission shaft includes a radial stopper, and the elastic pre-tightening component is pre-tightened between the radial stopper and the transmission key, so that the elastic pre-tightening component applies a pre-tightening force to the transmission key. With such a design, the elastic pre-tightening component can be compressed by the radial stopper and the transmission key so that the elastic pre-tightening component applies a pre-tightening force to the transmission key, and the structure is relatively simple.

[0016] In the above-mentioned mechanical overload protection transmission device, a groove is provided on the outer peripheral side of the transmission shaft, the first transmission groove extends radially along the transmission shaft and penetrates the bottom wall of the groove, and the radial stopper is fixed in the groove. With such a design, the groove can provide installation space for the radial stopper to avoid the transmission wheel, so as to facilitate the smooth rotation of the transmission wheel around the transmission shaft; in addition, when the end of the first transmission groove away from the groove has the function of preventing the transmission key from falling out, during assembly, the transmission key and the elastic preload component can be first installed into the first transmission groove through the groove, and then the radial stopper can be fixed in the groove to compress the elastic preload component, thereby reducing the difficulty of assembling the torque limiter.

[0017] In the above-mentioned mechanical overload protection transmission device, the transmission shaft also includes a fastener, which passes through the radial stopper and is threadedly connected to the bottom wall of the groove, so as to adjust the preload force of the elastic preload component. Such a design can not only facilitate the assembly of the radial stopper and ensure its connection reliability, but also realize the detachable connection of the radial stopper, thereby facilitating the subsequent separate replacement of the radial stopper, the elastic preload component and the transmission key; finally, by adjusting the screw-on length of the fastener, the preload force of the elastic preload component on the transmission key 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.

[0018] In the above mechanical overload protection transmission device, the radial stopper is provided with a positioning protrusion, and one end of the elastic preload component is sleeved on the positioning protrusion. Such a design can provide guidance for the expansion and contraction of the elastic preload component, thereby preventing the transmission key from tilting and getting stuck due to the deflection of the elastic preload component during expansion and contraction.

[0019] In the above-mentioned mechanical overload protection transmission device, the elastic preload component is one of a disc spring, a coil spring, a rubber spring or a combination thereof.

[0020] In the above-mentioned mechanical overload protection transmission device, two transmission wheels are installed on the transmission shaft, one of which is used to receive power input, and the other is used to output power; such a design can achieve overload protection through the other transmission wheel and the transmission shaft when the overload protection of one transmission wheel and the transmission shaft fails, so as to improve the reliability of the mechanical overload protection of the transmission device; or, one transmission wheel and a synchronous wheel are installed on the transmission shaft, and the synchronous wheel and the transmission shaft always rotate synchronously, and one of the transmission wheel and the synchronous wheel is used to receive power input, and the other is used to output power. Such a design can simplify the structure of the transmission device, thereby reducing the manufacturing cost of the transmission device.

[0021] In the above-mentioned mechanical overload protection transmission device, the transmission wheel is one of a gear, a sprocket, a pulley and a friction wheel.

[0022] The lifting drive system of the transfer machine includes a motor and a lifting device, wherein the lifting device includes a drum and a rigging wound on the drum, wherein the rotation of the drum drives the rigging to rise and fall, and the lifting drive system also includes a mechanical overload protection transmission device as described in any of the above technical solutions, wherein one of the transmission shaft and the transmission wheel is connected to the motor in a transmission manner, and the other is connected to the drum in a transmission manner. With such a design, the use of the mechanical overload protection transmission device can prevent the motor from being damaged when the patient being transferred is overweight or overloaded, thereby extending the service life of the lifting drive system.

[0023] In the lifting drive system of the above-mentioned transfer machine, the lifting drive system further comprises a first support frame and a second support frame which are spaced opposite to each other, the mechanical overload protection transmission device is installed between the first support frame and the second support frame, and both ends of the transmission shaft are rotatably connected to the first support frame and the second support frame respectively. Such a design not only allows the first support frame and the second support frame to provide installation positions for the transmission shaft, but also protects the transmission wheel.

[0024] 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 mechanical overload protection can prevent the motor from being damaged when the transferred patient is overweight and overloaded, thereby extending the service life of the transfer machine.

[0025] 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

[0026] The utility model is further described below in conjunction with the accompanying drawings:

[0027] Figure 1 This is a schematic diagram of the structure of the mechanical overload protection transmission device in the first embodiment of the utility model;

[0028] Figure 2 This is a schematic diagram of an explosion of a mechanical overload protection transmission device in Embodiment 1 of the present utility model;

[0029] Figure 3 This is a schematic diagram of the structure of the transmission shaft in the first embodiment of the utility model;

[0030] Figure 4 This is an axial cross-sectional view of the transmission shaft in the first embodiment of the utility model;

[0031] Figure 5 It is a radial cross-sectional view of the transmission shaft in the first embodiment of the utility model;

[0032] Figure 6 This is a schematic diagram of the structure of the transmission key in the first embodiment of the utility model;

[0033] Figure 7 This is an axial cross-sectional view of the mechanical overload protection transmission device in the first embodiment of the utility model;

[0034] Figure 8 This is a radial cross-sectional view of the mechanical overload protection transmission device in the first embodiment of the utility model;

[0035] Fig. 9 This is a cross-sectional view of the mechanical overload protection transmission device in the first embodiment of the utility model applied to the lifting drive system of the transfer machine;

[0036] Fig.10 A cross-sectional view of a mechanical overload protection transmission device in a first embodiment of the utility model applied to a lifting drive system of a transfer machine Figure 1 ;

[0037] Fig.11 A cross-sectional view of a mechanical overload protection transmission device in a first embodiment of the utility model applied to a lifting drive system of a transfer machine Figure 2 .

[0038] Reference numerals:

[0039] 100, transmission shaft; 110, first transmission groove; 111, necking portion; 1110, limiting surface; 112, guiding portion; 130, groove; 140, fastener; 120, radial stopper; 121, positioning protrusion; 200, transmission wheel; 210, through hole; 220, second transmission groove; 300, torque limiter; 310, transmission key; 311, transmission section; 3110, transmission surface; 312, guide section; 320, elastic preload component; 400, lifting device; 410, roller; 420, rigging; 500, motor; 510, reduction box; 600, first supporting frame; 700, second supporting frame; 800, rotating shaft; 810, transmission gear. [Specific implementation method]

[0040] The utility model provides a mechanical overload protection transmission device, comprising:

[0041] a transmission shaft having a first transmission groove; and

[0042] A transmission wheel having a through hole adapted to the transmission shaft, the transmission shaft passing through the through hole, and a second transmission groove radially corresponding to the first transmission groove being provided on the transmission wheel; and

[0043] The torque limiter built into the first transmission groove includes a transmission key and an elastic pre-tightening component. The elastic pre-tightening component applies a pre-tightening force to the transmission key, so that the transmission key extends out of the first transmission groove and maintains radial engagement with the second transmission groove under a predetermined torque. When the transmission wheel or the transmission shaft is subjected to an overload torque, the transmission key is forced to disengage from the second transmission groove, and the transmission wheel idles relative to the transmission shaft to implement overload protection.

[0044] When the transmission device in the utility model is in normal working state (that is, the load is not overloaded), the transmission key extends out of the first transmission groove under the preload force of the elastic preload component and maintains radial engagement with the second transmission groove under a predetermined torque. At this time, the transmission wheel and the transmission shaft can realize torque transmission through the transmission key, that is, power transmission; and when the load is overloaded, the transmission wheel or the transmission shaft forces the transmission key to disengage from the second transmission groove when subjected to the overload torque, thereby cutting off the torque transmission between the transmission wheel and the transmission shaft, so that the transmission wheel idles relative to the transmission shaft to implement overload protection, thereby avoiding the transmission wheel or the transmission bearing from being damaged by the reverse torque of excessive load, that is, avoiding damage to the transmission device, extending the service life of the transmission device, and also avoiding damage to the power components connected to the transmission device.

[0045] 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.

[0046] Embodiment 1

[0047] like Figures 1 to 8As shown, the mechanical overload protection transmission device of this embodiment includes a transmission shaft 100, a transmission wheel 200 and a torque limiter 300, wherein the transmission shaft 100 has a first transmission groove 110, the transmission wheel 200 is one of a gear, a sprocket, a pulley and a friction wheel, the transmission wheel 200 has a through hole 210 adapted to the radial cross section of the transmission shaft 100, the transmission shaft 100 passes through the through hole 210, so that the transmission wheel 200 is sleeved on the transmission shaft 100, the radial cross section of the transmission shaft 100 is circular, and the corresponding through hole 210 is a circular hole, and the transmission wheel 200 is also provided with a through hole 210 radially corresponding to the first transmission groove 110. The second transmission groove 220 is axially arranged to penetrate the transmission wheel 200; in addition, the torque limiter 300 is built into the first transmission groove 110, which includes a transmission key 310 and an elastic pre-tightening component 320. The elastic pre-tightening component 320 applies a pre-tightening force to the transmission key 310, so that the transmission key 310 extends out of the first transmission groove 110 and maintains radial engagement with the second transmission groove 220 under a predetermined torque. When the transmission wheel 200 or the transmission shaft 100 is subjected to an overload torque, the transmission key 310 is forced to disengage from the second transmission groove 220, and the transmission wheel 200 idles relative to the transmission shaft 100 to implement overload protection.

[0048] When the transmission device in this embodiment is in normal working state (i.e., the load is not overloaded), the transmission key 310 extends out of the first transmission groove 110 under the preload force of the elastic preload component 320 and maintains radial engagement with the second transmission groove 220 under a predetermined torque. At this time, the transmission wheel 200 and the transmission shaft 100 can realize torque transmission through the transmission key 310, that is, power transmission; and when the load is overloaded, the transmission wheel 200 or the transmission shaft 100 forces the transmission key 310 to disengage from the second transmission groove 220 when subjected to the overload torque, thereby cutting off the torque transmission between the transmission wheel 200 and the transmission shaft 100, so that the transmission wheel 200 idles relative to the transmission shaft 100 and implements overload protection, thereby avoiding the transmission wheel 200 or the transmission shaft 100 from being damaged by the reverse torque of the excessive load, that is, avoiding damage to the transmission device, extending the service life of the transmission device, and also avoiding damage to the power components connected to the transmission device.

[0049] It should be noted that the transmission device in this embodiment is mainly used for a shift lift, and the predetermined torque mentioned means that when the shift lift is in normal working condition, the transmission shaft 100 and the transmission wheel 200 extend the first transmission groove 110 through the transmission key 310 and engage with the second transmission groove 220 to achieve torque transmission. When the transmission wheel 200 or the transmission shaft 100 outputs the working torque to drive the load to move, it also bears the reverse torque from the load. In this embodiment, considering that the load exceeding the load limit of the shift lift is likely to cause damage to the shift lift, it is necessary to set a threshold value for the working torque that can maintain the engagement of the transmission key 310 with the second transmission groove 220 to achieve transmission of the transmission shaft 100 and the transmission wheel 200. When the shift lift is working normally (not overloaded), the reverse torque of the load will not exceed the threshold value. Under the action force of the elastic preload component 320, the transmission key 310 extends out of the first transmission groove 110 and maintains engagement with the second transmission groove 220 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, and the transmission key 310 will be driven to overcome the force of the elastic preload component 320 and disengage from the second transmission groove 220 to disconnect the torque transmission and thereby achieve overload protection. At this time, the transmission shaft 100 or the transmission wheel 200 idles and cannot transmit the reverse torque of the load, thereby avoiding the transmission wheel 200, the transmission shaft 100, and the transmission key 310 from being damaged by excessive load reverse torque. The above threshold is the "predetermined torque", which is provided by the preload force applied by the elastic preload component 320 to the transmission key 310.

[0050] Specifically, the transmission device in this embodiment includes two transmission wheels 200, and a torque limiter 300 is provided between each transmission wheel 200 and the transmission shaft 100. The structures of the two torque limiters 300 are the same, and one of them is taken as an example for explanation: the transmission key 310 is a block structure extending along the axis of the transmission shaft 100, and includes a transmission section 311 that can be inserted into the second transmission groove 220. The transmission section 311 includes two transmission surfaces 3110 extending along the axis of the transmission shaft 100 and arranged opposite to each other. The two transmission surfaces 3110 can be inserted into the second transmission groove 220, and the distance L2 between the two transmission surfaces 3110 gradually decreases radially outward along the transmission shaft 100, and the two side walls of the second transmission groove 220 are adapted to the two transmission surfaces 3110. With such a design, when the transmission wheel 200 or the transmission shaft 100 is subjected to an overload torque, the design of the transmission surface 3110 can enable the transmission section 311 to smoothly and slowly disengage from the second transmission groove 220, so as to achieve the purpose of cutting off the torque transmission, and avoid the problem that the transmission section 311 is stuck and cannot smoothly disengage from the second transmission groove 220; at the same time, it can also ensure that when the transmission key 310 is radially corresponding to the second transmission groove 220 again, the end with the smaller distance between the two transmission surfaces 3110 can be inserted into the second transmission groove 220 for pre-guiding, so as to facilitate the subsequent smooth insertion of the transmission key 310 into the second transmission groove 220, and the clutch is relatively smooth, thereby reducing noise, making the user experience better, and increasing the service life of the product.

[0051] The transmission surface 3110 in this embodiment is a transmission inclined surface which is radially outward and inclined toward the other transmission surface 3110. The inclination angles of the two transmission surfaces 3110 are equal, so that the radial cross-section of the transmission section 311 is an isosceles trapezoid or an isosceles triangle. The corresponding radial cross-sectional shape of the second transmission groove 220 is adapted to the radial cross-sectional shape of the transmission section 311. Such a design has a simple structure and is conducive to the processing and forming of the transmission key 310 and the second transmission groove 220.

[0052] It can be understood that in other embodiments of the present invention, the transmission surface can also be a transmission arc surface that bulges away from another transmission surface, that is, the radial cross section of the transmission section can refer to Figure 8 The radial cross section of the teeth of the middle gear is set, and at this time, the two side walls of the second transmission groove are arc surfaces convex toward the center direction of the second transmission groove, that is, referring to Figure 8 The radial cross-section of the tooth groove of the middle gear is set.

[0053] In order to prevent the transmission key 310 from radially outwardly escaping from the first transmission groove 110, in this embodiment, the first transmission groove 110 includes a necking portion 111, and the transmission section 311 can extend out of the first transmission groove 110 through the necking portion 111 to engage with the second transmission groove 220, wherein the inner side surface of the necking portion 111 includes two limiting surfaces 1110 distributed at intervals along the circumference of the transmission shaft 100, and the two limiting surfaces 1110 extend along the axis of the transmission shaft 100, and the distance L1 between the two limiting surfaces 1110 gradually decreases in the radial outward direction, and the minimum distance between the two limiting surfaces 1110 (that is, the size of the notch at one end of the first transmission groove 110 close to the second transmission groove 220) is smaller than the maximum distance between the two transmission surfaces 3110. Such a design can prevent the transmission section 311 from radially outwardly escaping from the first transmission groove 110, thereby improving the installation reliability of the transmission key 310 and the transmission shaft 100.

[0054] It should be noted that by reasonably controlling the minimum distance between the two limiting surfaces 1110 , it is possible to prevent the transmission section 311 from escaping from the first transmission groove 110 while still ensuring that the transmission section 311 extending out of the first transmission groove 110 is adapted to the second transmission groove 220 .

[0055] In addition, the transmission key 310 of the present embodiment further includes a guide section 312, the radial cross section of which is a rectangle, the guide section 312 is connected to the larger end of the transmission section 311, preferably the guide section 312 and the transmission section 311 are integrally formed, the guide section 312 is formed by radially extending inward from the transmission section 311, the width of the guide section 312 is equal to the maximum distance between the two transmission surfaces 3110, the guide section 312 is against the elastic preload component 320, and the first transmission groove 110 further includes a guide portion 112, the guide portion 112 cooperates with the guide section 312 to guide the guide section 312 to move along the radial direction of the transmission shaft 100. With such a design, the smoothness of the radial movement of the transmission key 310 is ensured by the cooperation of the guide portion 112 and the guide section 312, and the transmission key 310 is prevented from being deflected and stuck during radial movement, and cannot be smoothly extended or retracted into the first transmission groove 110 and disengaged from the second transmission groove 220, thereby increasing the difficulty of assembly and failing to cut off the torque transmission in time when overloaded.

[0056] In order to enable the elastic preload component 320 to apply a preload force to the transmission key 310, the transmission shaft 100 in this embodiment also includes a radial stopper 120. The elastic preload component 320 is preloaded between the radial stopper 120 and the transmission key 310 so that the elastic preload component 320 applies a preload force to the transmission key 310. The structure is relatively simple.

[0057] Preferably, a groove 130 is provided on the outer peripheral side of the transmission shaft 100, the first transmission groove 110 extends radially along the transmission shaft 100 and penetrates the bottom wall of the groove 130, the size of the groove 130 is larger than the size of the first transmission groove 110, and the radial stopper 120 is fixed in the groove 130. With such a design, the groove 130 can provide an installation space for the radial stopper 120 to avoid the transmission wheel 200, so that the transmission wheel 200 can rotate smoothly around the transmission shaft 100; in addition, during assembly, the transmission key 310 and the elastic preload component 320 can be first installed into the first transmission groove 110 through the groove 130, and then the radial stopper 120 can be fixed in the groove 130 to compress the elastic preload component 320, thereby reducing the difficulty of assembling the torque limiter 300.

[0058] In order to be able to adjust the predetermined torque, the transmission shaft 100 in this embodiment also includes a fastener 140, which is a threaded connector, such as a screw. The fastener 140 passes through the radial stop 120 and is threadedly connected to the bottom wall of the groove 130. The head of the screw abuts against the side of the radial stop 120 that is away from the elastic pre-tightening component 320, so as to fix the radial stop 120 in the groove 130. Such a design can facilitate the assembly of the radial stop 120 and ensure its connection reliability, and can also realize the detachable connection of the radial stop 120, thereby facilitating the subsequent separate replacement of the radial stop 120, the elastic pre-tightening component 320 and the transmission key 310; finally, by adjusting the screw-on length of the fastener 140, the pre-tightening force of the elastic pre-tightening component 320 on the transmission key 310 can be adjusted, thereby realizing the adjustment of the predetermined torque without affecting the cooperation of the axial parts, and the adjustment is relatively convenient.

[0059] Finally, in this embodiment, a positioning protrusion 121 is provided on the radial stopper 120, and the elastic preload component 320 is a coil spring, and one end of the elastic preload component 320 is sleeved on the positioning protrusion 121. Such a design can provide guidance for the extension and contraction of the elastic preload component 320, and prevent the elastic preload component 320 from being deflected when extending and contracting, thereby preventing the transmission key 310 from being tilted and stuck.

[0060] It should be noted that when the transmission device of this embodiment is used, in the case of overload, although the idling of the transmission wheel 200 will cause the transmission key 310 to remain engaged with the second transmission groove 220 again, under the action of the load reverse torque, the transmission key 310 will be forced to overcome the force of the elastic preload component 320 and disengage from the second transmission groove 220 to disconnect the torque transmission, that is, during the entire idling process of the transmission wheel 200, although there will be continuous clutching, the reverse torque of the load will not be transmitted to the transmission shaft 100, thereby achieving overload protection.

[0061] 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.

[0062] It can be understood that in other embodiments of the present invention, the radial stop member can also be integrally formed with the transmission shaft, so that the first transmission groove can form a blind groove with one end closed. At this time, the notch of the first transmission groove is larger than the size of the elastic preload component and the transmission key, so that the elastic preload component and the transmission key can be inserted into the first transmission groove through the notch. By selecting elastic preload components with different elastic moduli, the preload force can be adjusted, that is, the predetermined torque can be adjusted.

[0063] It is understandable that in other embodiments of the utility model, the transmission key can also be a ball pin, and the second transmission groove is an arc-shaped groove that matches the ball head of the ball pin; or the transmission key is a transmission ball, and the second transmission groove is an arc-shaped groove that matches the transmission ball. Such a design is not only simple in structure, but also can make the transmission key smoothly and slowly disengage from the second transmission groove when the transmission wheel or the transmission shaft is subjected to overload torque, so as to achieve the purpose of cutting off torque transmission, avoiding the problem that the transmission key is stuck and cannot smoothly disengage from the second transmission groove, and at the same time, it can also ensure that when the transmission key is radially corresponding to the second transmission groove again, the transmission key can be smoothly and slowly inserted into the second transmission groove, and the clutch is relatively stable, thereby reducing noise, making the user experience better, and increasing the service life of the product.

[0064] like Figures 9 to 11 As shown, this embodiment also discloses a lifting drive system of a transfer machine, including a lifting device 400 and a motor 500, the lifting device 400 includes a drum 410 and a rigging 420 wound on the drum 410, the rotation of the drum 410 drives the rigging 420 to rise and fall, and the lifting drive system also includes the mechanical overload protection transmission device described above, one of the transmission shaft 100 and the transmission wheel 200 is connected to the motor 500, and the other is connected to the drum 410. With such a design, after adopting the mechanical overload protection transmission device, the motor 500 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.

[0065] Specifically, in the transmission device of mechanical overload protection of this embodiment, one of the two transmission wheels 200 is transmission-connected to the drum 410, and the other is transmission-connected between the transmission shaft 100 and the motor 500 to receive power input and to transmit power to the transmission shaft 100. With such a design, when the overload protection of one of the transmission wheels 200 and the transmission shaft 100 fails, overload protection can be achieved through the other transmission wheel 200 and the transmission shaft 100, so as to improve the reliability of the mechanical overload protection of the transmission device.

[0066] The lifting drive system further includes a first support frame 600 and a second support frame 700 which are spaced apart from each other, a mechanical overload protection transmission device is installed between the first support frame 600 and the second support frame 700, two ends of the transmission shaft 100 are rotatably connected to the first support frame 600 and the second support frame 700 through bearings, two motors 500 are respectively located on the outside of the first support frame 600 and the second support frame 700, a reduction box 510 is connected to the output end of each motor 500, a rotating shaft 800 is rotatably installed between the first support frame 600 and the second support frame 700, two ends of the rotating shaft 800 are respectively connected to the two reduction boxes 510, and the rotating shaft 800 is rotatably installed between the first support frame 600 and the second support frame 700. 0 is equipped with a synchronously rotating transmission gear 810, and both transmission wheels 200 are gears. For the convenience of description, the two transmission wheels 200 are respectively referred to as the first transmission wheel and the second transmission wheel, wherein the first transmission wheel is meshed with the transmission gear 810, and the second transmission wheel is meshed with the gear ring on the drum 410. Under a predetermined torque, the motor 500 can transmit the torque to the first transmission wheel through the reduction box 510, the rotating shaft 800 and the transmission gear 810, and then transmit the torque to the second transmission wheel through the torque limiter 300, the transmission shaft 100, and the torque limiter 300 between the first transmission wheel and the transmission shaft 100. When in use, one of the motors 500 can drive the rotating shaft 800 to rotate, or the two motors 500 can drive the rotating shaft 800 to rotate at the same time.

[0067] When overload occurs, the reverse torque of the load on the second transmission wheel will force the transmission key 310 to disengage from the second transmission groove 220 on the second transmission wheel, and the second transmission wheel will idle relative to the transmission shaft 100 to implement overload protection, thereby avoiding the transmission of torque to the transmission shaft 100, the first transmission wheel, the transmission gear 810, the reduction box 510 and the motor 500, thereby avoiding the transmission shaft 100, the first transmission wheel, the transmission gear 810, the reduction box 510 and the motor 500 from being damaged due to excessive load torque. When the transmission key 310 between the second transmission wheel and the transmission shaft 100 cannot be disengaged from the second transmission groove 220, resulting in the failure of the overload protection between the second transmission wheel and the transmission shaft 100, the transmission key 310 can also be forced to disengage from the second transmission groove 220 on the first transmission wheel through the transmission shaft 100, so that the transmission shaft 100 idles relative to the first transmission wheel, thereby avoiding the transmission of torque to the first transmission wheel, the transmission gear 810, the reduction box 510 and the motor 500.

[0068] It can be understood that in other embodiments of the present invention, the transmission device may also include only one transmission wheel, in which case the transmission shaft is connected to the reduction box, and the transmission wheel is engaged with the ring gear on the drum; or, the transmission wheel is connected to the reduction box, and the drum is mounted on the transmission shaft and rotates synchronously with the transmission shaft.

[0069] It can be understood that in other embodiments of the utility model, a transmission wheel and a synchronous wheel are installed on the transmission shaft, and the synchronous wheel and the transmission shaft always rotate synchronously. One of the transmission wheel and the synchronous wheel is used to connect to the motor to receive power input, and the other is connected to the drum for power output. Such a design can simplify the structure of the transmission device and thus reduce the manufacturing cost of the transmission device.

[0070] 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.

[0071] Embodiment 2

[0072] This embodiment also discloses a transfer machine, including a track mechanism and a main machine, the main machine is connected to the track mechanism and can move along the track mechanism, the main machine 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 main machine can move along the guide rail; wherein the people and objects that need to be moved and lifted act on the rigging 420 of the lifting drive system, thereby applying a load to the transmission wheel 200 or the transmission shaft 100 of the lifting drive system, and the load will generate a reverse torque on the transmission wheel 200 or the transmission shaft 100, and when the load is small, the transfer machine During normal operation, the reverse torque of the load will not exceed the predetermined torque, the transmission key 310 remains engaged with the second transmission groove 220 and transmits the working torque, thereby realizing the lifting and lowering of objects or people on the rigging 420, 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 420; once the load is overloaded, the transmission wheel 200 or the transmission shaft 100 forces the transmission key 310 to move radially out of the second transmission groove 220 when subjected to the overload torque, so that the transmission wheel 200 idles relative to the transmission shaft 100 to implement overload protection.

[0073] 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. Mechanical overload protection transmission device, characterized in that: include: A transmission shaft having a first transmission groove; as well as, A transmission wheel having a through hole adapted to the transmission shaft, the transmission shaft passing through the through hole, and a second transmission groove radially corresponding to the first transmission groove being provided on the transmission wheel; and, The torque limiter built into the first transmission groove includes a transmission key and an elastic pre-tightening component. The elastic pre-tightening component applies a pre-tightening force to the transmission key, so that the transmission key extends out of the first transmission groove and maintains radial engagement with the second transmission groove under a predetermined torque. When the transmission wheel or the transmission shaft is subjected to an overload torque, the transmission key is forced to disengage from the second transmission groove, and the transmission wheel idles relative to the transmission shaft to implement overload protection.

2. The mechanical overload protection transmission device according to claim 1, characterized in that: The transmission key includes a transmission section that can be inserted into the second transmission groove, and the transmission section includes two transmission surfaces extending along the axis of the transmission shaft and arranged opposite to each other. The distance between the two transmission surfaces gradually decreases radially outward along the transmission shaft, and the side wall of the second transmission groove is adapted to the transmission surface.

3. The mechanical overload protection transmission device according to claim 2, characterized in that: The first transmission groove includes a necked portion, and the transmission section extends out of the first transmission groove through the necked portion. The inner side surface of the necked portion includes limiting surfaces distributed at intervals along the circumference of the transmission shaft. The distance between the two limiting surfaces gradually decreases along the radial outward direction, and the minimum distance between the two limiting surfaces is smaller than the maximum distance between the two transmission surfaces.

4. The mechanical overload protection transmission device according to claim 2, characterized in that: The transmission key further includes a guide section, which abuts against the elastic preload component. The first transmission groove further includes a guide portion, which cooperates with the guide section to guide the guide section to move radially along the transmission shaft.

5. The mechanical overload protection transmission device according to claim 2, characterized in that: The transmission surface is a transmission inclined surface that is radially outward and inclined toward another transmission surface; or the transmission surface is a transmission arc surface that is convex in a direction away from another transmission surface.

6. The mechanical overload protection transmission device according to claim 1, characterized in that: The transmission key is a ball stud, and the second transmission groove matches the ball head of the ball stud; or the transmission key is a transmission ball, and the second transmission groove matches the transmission ball.

7. The mechanical overload protection transmission device according to any one of claims 1 to 6, characterized in that: The transmission shaft comprises a radial stopper, and the elastic preload component is preloaded between the radial stopper and the transmission key, so that the elastic preload component applies a preload force to the transmission key.

8. The mechanical overload protection transmission device according to claim 7, characterized in that: A groove is provided on the outer peripheral side of the transmission shaft. The first transmission groove extends radially along the transmission shaft and penetrates the bottom wall of the groove. The radial stopper is fixed in the groove.

9. The mechanical overload protection transmission device according to claim 8, characterized in that: The transmission shaft further comprises a fastener, which passes through the radial stopper and is threadedly connected to the bottom wall of the groove so as to be used for adjusting the preload force of the elastic preload component.

10. The mechanical overload protection transmission device according to claim 7, characterized in that: The radial stopper is provided with a positioning protrusion, and one end of the elastic pre-tightening component is sleeved on the positioning protrusion.

11. The mechanical overload protection transmission device according to any one of claims 1 to 6, characterized in that: The elastic preload component is one of a disc spring, a coil spring, and a rubber spring, or a combination thereof.

12. The mechanical overload protection transmission device according to any one of claims 1 to 6, characterized in that: Two transmission wheels are installed on the transmission shaft, one of which is used to receive power input, and the other is used to output power; or, one transmission wheel and a synchronous wheel are installed on the transmission shaft, and the synchronous wheel always rotates synchronously with the transmission shaft, and one of the transmission wheel and the synchronous wheel is used to receive power input, and the other is used to output power.

13. The mechanical overload protection transmission device according to any one of claims 1 to 6, characterized in that: The transmission wheel is one of a gear, a sprocket, a pulley and a friction wheel.

14. 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 also includes a mechanical overload protection transmission device as described in any one of claims 1 to 13, one of the transmission shaft and the transmission wheel is connected to the motor, and the other is connected to the drum.

15. The lifting drive system of the transfer machine according to claim 14, 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 mechanical overload transmission device is installed between the first support frame and the second support frame, and both ends of the transmission shaft are rotatably connected to the first support frame and the second support frame respectively.

16. 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 14 or 15.

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