Shifting machine with overload protection

Abstract

The utility model discloses a shifting machine with overload protection, which comprises a motor, a lifting device and a transmission device, the motor drives the lifting device to act through the transmission device, the transmission device comprises a torque input part, a torque output part and a torque output part, the torque input part comprises an input transmission body and an input connecting body which rotate synchronously, and the input transmission body receives power input; the torque output component comprises an output transmission body and an output connecting body which rotate synchronously, and the output transmission body outputs power; the torsion spring tightly holds the input connecting body and the output connecting body, and the direction in which the torsion spring tightens the output connecting body is consistent with the direction in which the torque output component bears the load torque; wherein the torque input component and the torque output component transmit torque through the torsional spring, and when the torque output component is subjected to overload torque, the input connector and / or the output connector overcome the holding force of the torsional spring to slip relative to the torsional spring so as to implement overload protection.

Description

[Technical field]

[0001] The utility model relates to the technical field of transfer machines, in particular to a transfer machine with overload protection. [Background technology]

[0002] A transfer machine is a medical auxiliary device, which is mainly used to help patients with limited mobility to lift and transfer. It can reduce the physical labor of nursing staff and reduce the risk of patient injury. A common transfer machine in the prior art includes a motor, a lifting device and a transmission device. The motor drives the lifting device to move through the transmission device, wherein the lifting device includes a drum with a rigging wound on it, and the transmission device includes a torque input component and a torque output component. The torque input component is connected to the motor for receiving power input, and the torque output component is connected to the drum to drive the drum to rotate so as to achieve power output. The rotation of the drum will achieve the winding and release of the rigging, thereby achieving the lifting and lowering of the patient by the transfer machine. When the load (patient) 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. [Utility Model Content]

[0003] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a transfer machine with overload protection, which can cut off the torque transmission between the torque input component and the torque output component by causing the torque input component and / or the torque output component to slip relative to the torsion spring when the load is overloaded, 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] A lifting machine with overload protection comprises a motor, a lifting device and a transmission device, wherein the motor drives the lifting device to move through the transmission device, and the transmission device comprises:

[0006] a torque input component, comprising an input transmission body and an input connecting body that rotate synchronously, wherein the input transmission body receives power input; and

[0007] A torque output component, comprising an output transmission body and an output connecting body that rotate synchronously, wherein the output transmission body outputs power; and

[0008] a torsion spring, respectively holding the input connector and the output connector tightly, wherein the direction in which the torsion spring tightens the output connector is consistent with the direction in which the torque output component bears the load torque;

[0009] The torque input component and the torque output component transmit torque via the torsion spring. When the torque output component is subjected to overload torque, the input connector and / or the output connector overcomes the clamping force of the torsion spring and slips relative to the torsion spring to implement overload protection.

[0010] When the shifting machine of the utility model is in normal use, the torsion spring clamps the input connector and the output connector, so that the torque input component transmits the torque to the torque output component through the torsion spring, and then transmits the power to the lifting device through the torque output component to realize the lifting and lowering of the load; when the load is overloaded, the torque output component will be subjected to the overload torque. At this time, the input connector and / or the output connector will overcome the clamping force of the torsion spring and slip relative to the torsion spring, so that the torque transmission between the torque input component and the torque output component can be cut off, so that the torque output component is idling relative to the torque input component to implement overload protection, and the idling of the torque output component can quickly release the reverse torque applied by the load, thereby avoiding damage to the torque output component, and because the torque output component cannot transmit the reverse torque of the load to the torque input component, it is also avoided that the torque input component 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.

[0011] In the above-mentioned overload protection lifting machine, the transmission device further comprises a support shaft, and the torque input component and the torque output component are rotatably mounted on the support shaft. With such a design, the torque input component and the torque output component can be coaxially arranged, so as to simplify the structure of the torsion spring and the transmission device and facilitate the assembly of the transmission device.

[0012] In the above-mentioned transfer machine with overload protection, the torque input component and the torque output component are limited in axial displacement by the axial stop component on the support shaft. Such a design can prevent the torque input component and the torque output component from axially moving, because once the torque input component and the torque output component move axially, the torsion spring will not be able to hold the input connector and the output connector tightly. As a result, when the transfer machine is used normally, there is a risk that the torque input component cannot transmit the torque to the torque output component through the torsion spring, thereby affecting the normal use of the transfer machine.

[0013] In the above-mentioned transfer machine with overload protection, the torsion spring and the input connector, and the torsion spring and the output connector respectively form surface contact. Such a design can increase the contact area between the torsion spring and the input connector and the torsion spring and the output connector, thereby increasing the clamping force between the torsion spring and the input connector and the clamping force between the torsion spring and the output connector when the number of clamping turns between the torsion spring and the input connector remains unchanged and the number of clamping turns between the torsion spring and the output connector remains unchanged, thereby ensuring the torque transmission between the torque input component and the torque output component when the transfer machine is in normal use.

[0014] In the above-mentioned lift with overload protection, the torsion spring includes a spiral body and a driven torsion spring arm arranged at one end of the spiral body, and the first stop and the second stop are arranged circumferentially at intervals on the torque output component, and the driven torsion spring arm is limited to slide relative to the torque output component between the first stop and the second stop, which is used to control the slipping stroke of the torque output component. With such a design, when the load is overloaded, by controlling the clamping force between the torsion spring and the output connector to be smaller than the clamping force between the torsion spring and the input connector, the output connector and the torsion spring can be caused to slip and overload protection can be implemented. Then, since the direction in which the torsion spring tightens the output connector is consistent with the direction in which the torque output component bears the load torque, the rotation of the torque output component under the action of the load torque will drive the driven torsion spring arm to move in the direction of tightening the torsion spring, so that the torsion spring clamps the output connector again, and the slipping of the output connector relative to the torsion spring is stopped, thereby achieving the control of the slipping stroke of the torque output component and preventing the patient from falling and getting injured.

[0015] In the above-mentioned shifting machine with overload protection, a driven limit groove is circumferentially arranged on the output transmission body, and the driven torsion spring arm extends into the driven limit groove, and the circumferential ends of the driven limit groove respectively constitute the first stop and the second stop. With such a design, the first stop and the second stop are formed by using the circumferential ends of the driven limit groove, so that the first stop and the second stop can be arranged on the output transmission body, rather than being arranged on the output connecting body and occupying the output connecting body, thereby reserving sufficient space for the torsion spring to hold the output connecting body tightly. (The first stop and the second stop can also be arranged on the outer shaft side of the output connecting body at intervals in the circumferential direction)

[0016] In the above-mentioned transfer machine with overload protection, the torsion spring includes a spiral body and an active torsion spring arm arranged at one end of the spiral body, and a third stop and a fourth stop are arranged circumferentially at intervals on the torque input component. The active torsion spring arm is limited to slide relative to the torque input component between the third stop and the fourth stop, so as to control the slipping stroke of the torque input component. With this design, when the load is overloaded, the clamping force between the torsion spring and the output connector is controlled to be greater than the clamping force between the torsion spring and the input connector, so that the input connector and the torsion spring can slip and overload protection is implemented. Then, because the direction in which the torsion spring tightens the output connector is consistent with the direction in which the torque output component bears the load torque, the torque output component drives the torsion spring to rotate under the action of the load torque, which drives the active torsion spring arm to slide until it is stopped. As the torque output component drives the torsion spring to continue to rotate, the active torsion spring arm is stopped, so the active torsion spring arm can be driven to tighten the torsion spring, so that the torsion spring clamps the input connector again, and the slipping of the input connector relative to the torsion spring stops, thereby controlling the slipping stroke of the torque output component and preventing the patient from falling and getting injured.

[0017] In the above-mentioned shifting machine with overload protection, an active limit groove is provided on the input transmission body along the circumferential direction, and the active torsion spring arm extends into the active limit groove, and the circumferential ends of the active limit groove respectively constitute the third stop and the fourth stop. With such a design, the third stop and the fourth stop are formed by using the circumferential ends of the active limit groove, so that the third stop and the fourth stop can be provided on the input transmission body, rather than being provided on the input connecting body and occupying the input connecting body, thereby reserving sufficient space for the torsion spring to hold the input connecting body tightly. (The third stop and the fourth stop can also be provided on the outer shaft side of the input connecting body at intervals in the circumferential direction)

[0018] In the above-mentioned lift with overload protection, the torsion spring includes a spiral body, a driven torsion spring arm arranged at one end of the spiral body, and an active torsion spring arm arranged at the other end of the spiral body, a first stopper and a second stopper are arranged circumferentially at intervals on the torque output component, and a third stopper and a fourth stopper are arranged circumferentially at intervals on the torque input component, the driven torsion spring arm is limited to slide relative to the torque output component between the first stopper and the second stopper, and the active torsion spring arm is limited to slide relative to the torque input component between the third stopper and the fourth stopper, so as to control the slipping stroke of the torque output component and the torque input component. With such a design, after the overload protection is implemented, the torsion spring can be further tightened by the stops of the active torsion spring arm and the driven torsion spring arm to hold the input connector and the output connector tightly to stop slipping, thereby realizing the control of the slipping stroke of the torque output component and preventing the patient from falling and getting injured.

[0019] In the above-mentioned transfer machine with overload protection, the transfer machine further comprises a locking pin and an operating rod, and the operating rod drives the locking pin to engage with the torque output component to limit its rotation.

[0020] In the above-mentioned transfer machine with overload protection, the locking pin is arranged to move along the axial direction of the torque output component between a locking position for engaging the torque output component and a release position for disengaging the torque output component, and the locking pin is held by the elastic reset element and is normally maintained at the release position. With such a design, after the operating lever loses the external force, the restoring force of the elastic reset element can automatically reset the locking pin and keep it at the release position normally, so as to avoid limiting the rotation of the torque output component, thereby ensuring the normal use of the transfer machine, and the structure is relatively simple, thereby reducing the manufacturing cost of the transmission device.

[0021] In the above-mentioned lift with overload protection, the joystick is provided with a first cone disk, and the locking pin is provided with a second cone disk, and the first cone disk and the second cone disk cooperate orthogonally to convert the pulling force of the joystick into the axial thrust of the locking pin, so as to drive the locking pin to move to the locking position. With such a design, the locking pin can be driven to move axially to the locking position by pulling the joystick downward, thereby facilitating the user to operate the joystick and improving the user experience.

[0022] In the above-mentioned lift with overload protection, 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.

[0023] In the above-mentioned transfer machine with overload protection, the lifting device includes a drum and a rigging wound on the drum, the motor drives the drum to rotate through the transmission device, and the rotation of the drum drives the rigging to rise and fall.

[0024] In the above-mentioned transfer machine with overload protection, the transfer machine includes a track mechanism and a main machine, the motor, the lifting device and the transmission device are arranged on the main machine, and the main machine is connected to the track mechanism and can move along the track mechanism.

[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 transfer machine in the first embodiment of the utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the transmission device in the first embodiment of the utility model;

[0029] Figure 3 It is a right side view of the transmission device in the first embodiment of the utility model;

[0030] Figure 4 It is a left side view of the transmission device in the first embodiment of the utility model;

[0031] Figure 5 This is a schematic diagram of the structure of the transmission device in the first embodiment of the utility model when it is in normal use;

[0032] Figure 6 This is a schematic diagram of the structure after the input connector and the output connector both slip relative to the torsion spring in the second embodiment of the utility model;

[0033] Figure 7This is a schematic diagram of the structure after the input connector in Embodiment 1 of the utility model slips relative to the torsion spring;

[0034] Figure 8 This is a schematic diagram of the structure after the output connector slips relative to the torsion spring in the first embodiment of the utility model;

[0035] Fig. 9 This is a schematic diagram of a lift in Embodiment 1 of the present utility model equipped with a joystick and a locking pin;

[0036] Fig.10 for Fig. 9 A cross-sectional view of

[0037] Fig.11 for Fig.10 A is a partial enlarged schematic diagram;

[0038] Fig.12 This is the process of resetting the driven torsion spring arm and the active torsion spring arm of the torsion spring in the first embodiment of the utility model.

[0039] Reference numerals:

[0040] 100, motor; 200, lifting device; 210, drum; 220, rigging; 300, transmission device; 310, torque input component; 311, input transmission body; 312, input connector; 313, third stopper; 314, fourth stopper; 315, active limit groove; 320, torque output component; 321, output transmission body; 322, output connector; 323, first stopper; 324, second stopper; 325, driven limit groove; 330, torsion spring; 331, spiral body; 332, driven torque Spring arm; 333, active torsion spring arm; 340, support shaft; 400, axial stop member; 410, limiting boss; 420, retaining spring; 500, locking pin; 510, first boss; 520, elastic reset element; 530, second cone disk; 600, joystick; 610, first cone disk; 620, second boss; 630, reset spring; 640, pull rod; 700, first support frame; 800, second support frame; 900, transmission shaft; 910, transmission wheel; 1000, bracket; 1100, track mechanism. [Specific implementation method]

[0041] The utility model provides a transfer machine with overload protection, comprising a motor, a lifting device and a transmission device, wherein the motor drives the lifting device to move through the transmission device, and the transmission device comprises:

[0042] a torque input component, comprising an input transmission body and an input connecting body that rotate synchronously, wherein the input transmission body receives power input; and

[0043] A torque output component, comprising an output transmission body and an output connecting body that rotate synchronously, wherein the output transmission body outputs power; and

[0044] a torsion spring, respectively holding the input connector and the output connector tightly, wherein the direction in which the torsion spring tightens the output connector is consistent with the direction in which the torque output component bears the load torque;

[0045] The torque input component and the torque output component transmit torque via the torsion spring. When the torque output component is subjected to overload torque, the input connector and / or the output connector overcomes the clamping force of the torsion spring and slips relative to the torsion spring to implement overload protection.

[0046] When the shifting machine of the utility model is in normal use, the torsion spring clamps the input connector and the output connector, so that the torque input component transmits the torque to the torque output component through the torsion spring, and then transmits the power to the lifting device through the torque output component to realize the lifting and lowering of the load; when the load is overloaded, the torque output component will be subjected to the overload torque. At this time, the input connector and / or the output connector will overcome the clamping force of the torsion spring and slip relative to the torsion spring, so that the torque transmission between the torque input component and the torque output component can be cut off, so that the torque output component is idling relative to the torque input component to implement overload protection, and the idling of the torque output component can quickly release the reverse torque applied by the load, thereby avoiding damage to the torque output component, and because the torque output component cannot transmit the reverse torque of the load to the torque input component, it is also avoided that the torque input component 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.

[0047] 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.

[0048] Embodiment 1

[0049] like Figures 1 to 12As shown, the transfer machine of this embodiment includes a motor 100, a lifting device 200 and a transmission device 300. The motor 100 drives the lifting device 200 to move through the transmission device 300. The lifting device 200 includes a drum 210 and a rigging 220 wound on the drum 210. The motor 100 drives the drum 210 to rotate through the transmission device 300. The rotation of the drum 210 winds or releases the rigging, thereby driving the rigging 220 to move up and down, and further realizing the lifting and lowering of the patient or object hung on the rigging 220. The transmission device 300 includes a torque input component 310, a torque output component 320 and a torsion spring 330, wherein the torque input component 310 includes a synchronously rotating input transmission body 311 and an input connecting body 312, the input transmission body 311 receives the power input from the motor 100; the torque output component 320 includes a synchronously rotating output transmission body 321 and an output connecting body 322, the output transmission body 321 is connected to the drum 210 and outputs the power to the drum 210, so as to drive the drum 210. 0 rotation; the torsion spring 330 respectively holds the input connector 312 and the output connector 322, so that the torque input component 310 and the torque output component 320 transmit torque through the torsion spring 330, and the direction in which the torsion spring 330 tightens the output connector 322 is consistent with the direction in which the torque output component 320 bears the load torque. When the torque output component 320 is subjected to an overload torque, the input connector 312 and / or the output connector 322 overcome the holding force of the torsion spring 330 and slip relative to the torsion spring 330 to implement overload protection.

[0050] When the lift in this embodiment is in normal use, the torsion spring 330 holds the input connector 312 and the output connector 322 tightly, so that the torque input component 310 can transmit the torque to the torque output component 320 through the torsion spring 330, and then the power is transmitted to the lifting device 200 through the torque output component 320 to achieve the lifting of the load; when the load is overloaded, the torque output component 320 will be subjected to the overload torque, at which time the input connector 312 and / or the output connector 322 will overcome the holding force of the torsion spring 330 and slip relative to the torsion spring 330, so that the torque input component 310 and the output connector 322 can be cut off. The torque transmission between the torque output components 320 allows the torque output component 320 to idle relative to the torque input component 310 to implement overload protection. The idling of the torque output component 320 can quickly release the reverse torque applied by the load, thereby avoiding damage to the torque output component 320. Since the torque output component 320 cannot transmit the reverse torque of the load to the torque input component 310, it also avoids the torque input component 310 from being damaged by the reverse torque of excessive load, thereby avoiding damage to the transmission device 300 and extending the service life of the transmission device 300.

[0051] It should be noted that, when the lift is in normal working condition, the torsion spring 330 respectively holds the input connector 312 and the output connector 322, so that the torque input component 310 and the torque output component 320 can be connected in transmission to transmit torque. When the torque input component 310 outputs the working torque to the torque output component 320 through the torsion spring 330, they also bear the reverse torque from the load. In this embodiment, considering that the load exceeding the load limit of the lift is likely to cause damage to the lift, it is necessary to set a threshold value for the working torque that can keep the torsion spring 330 holding the input connector 312 and the output connector 322 to realize the transmission of the torque input component 310 and the torque output component 320. When the lift is working normally (not overloaded), the reverse torque of the load will not exceed the threshold value, and the torsion spring 330 respectively holds the input connector 312 and the output connector 322. The connecting body 312 and the output connecting body 322 are used to realize the transmission of the working torque, and then complete the transmission of power. Once an overload occurs, the reverse torque of the load exceeds the threshold value and will be transmitted to the torque output component 320 through the roller 210. When the torque output component 320 is subjected to the overload torque, the input connecting body 312 and / or the output connecting body 322 overcome the clamping force of the torsion spring 330 and slip relative to the torsion spring 330 to implement overload protection. At this time, the torque output component 320 idles and cannot transmit the reverse torque of the load to the torque input component 310, thereby preventing the torque input component 310 and the motor 100 from being damaged by the excessive reverse torque of the load. The above threshold value is the "predetermined torque", which is provided by the clamping force applied by the torsion spring 330 on the input connecting body 312 and the output connecting body 322. In this embodiment, the clamping force can be adjusted by replacing different torsion springs 330, thereby adjusting the predetermined torque.

[0052] Specifically, the input connector 312 and the input transmission body 311 in this embodiment are integrally formed and coaxially arranged to achieve synchronous rotation of the input connector 312 and the input transmission body 311, and the output connector 322 and the output transmission body 321 are integrally formed and coaxially arranged to achieve synchronous rotation of the output connector 322 and the output transmission body 321. In order to reduce material costs, the input connector 312 and the output connector 322 have the same diameter, and the outer diameters of the input connector 312 and the output connector 322 are smaller than those of the input transmission body 311 and the output transmission body 321. The transmission device 300 also includes a support shaft 340, which is a cylindrical optical axis, and the torque input component 310 and the torque output component 320 are provided with a circular hole for the support shaft 340 to pass through, thereby enabling the torque input component 310 and the torque output component 320 to be rotatably mounted on the support shaft 340. Such a design allows the torque input component 310 and the torque output component 320 to be coaxially arranged, and facilitates the torsion spring 330 to be mounted on the input connector 312 and the output connector 322, thereby simplifying the structure of the torsion spring 330 and the transmission device 300, and also facilitating the assembly of the transmission device 300.

[0053] In order to prevent the input connector 312 and the output connector 322 from axially moving along the support shaft 340 and causing the torsion spring 330 to be unable to tightly hold the input connector 312 and the output connector 322, in this embodiment, the torque input component 310 and the torque output component 320 are restricted in axial displacement by the axial stop component 400 on the support shaft 340. The axial stop component 400 includes a limiting boss 410 and a retaining spring 420 axially spaced along the support shaft 340. The limiting boss 410 is sleeved on the outside of the support shaft 340 and is integrally formed with the support shaft 340. The outer diameter of the limiting boss 410 is larger than the size of the circular hole and abuts against the side of the output transmission body 321 away from the output connecting body 322. A retaining groove is also provided on the support shaft 340. The outer diameter of the retaining spring 420 is larger than the size of the circular hole. The retaining spring 420 is clamped in the groove and abuts against the side of the input transmission body 311 away from the input connecting body 312, and the output connecting body 322 abuts against the input connecting body 312. The limiting boss 410 and the retaining spring 420 can limit the torque input component 310 and the torque output component 320 axially between the limiting boss 410 and the retaining spring 420 to prevent torque The torque input component 310 and the torque output component 320 are axially displaced on the support shaft 340, and it is also convenient for the torque input component 310 and the torque output component 320 to be assembled onto the support shaft 340. This embodiment prevents the torque input component 310 and the torque output component 320 from axially moving on the support shaft 340 by limiting the axial displacement of the torque input component 310 and the torque output component 320 on the support shaft 340. This is because once the torque input component 310 and the torque output component 320 move axially, the torsion spring 330 will not be able to hold the input connector 312 and the output connector 322 tightly. As a result, when the lifting machine is in normal use, there is a risk that the torque input component 310 cannot transmit the torque to the torque output component 320 through the torsion spring 330, thereby affecting the normal use of the lifting machine.

[0054] In order to increase the clamping force between the torsion spring 330 and the input connector 312 and the output connector 322, the steel wire cross-section of the torsion spring 330 in this embodiment is rectangular so that the torsion spring 330 and the input connector 312, and the torsion spring 330 and the output connector 322 form surface contact respectively. Such a design, compared with a torsion spring with a circular steel wire cross-section, not only can the torsion spring 330 have higher fatigue resistance and stronger elastic deformation ability, thereby extending its service life; it can also increase the contact area between the torsion spring 330 and the input connector 312 and the contact area between the torsion spring 330 and the output connector 322, so as to increase the clamping force between the torsion spring 330 and the input connector 312 and the clamping force between the torsion spring 330 and the output connector 322 when the number of clamping turns between the torsion spring 330 and the input connector 312 remains unchanged and the number of clamping turns between the torsion spring 330 and the output connector 322 remains unchanged, thereby shortening the axial length of the input connector 312 and the output connector 322, and also ensuring the torque transmission between the torque input component 310 and the torque output component 320 when the lift is in normal use.

[0055] The torsion spring 330 in this embodiment includes a spiral body 331, a driven torsion spring arm 332 arranged at one end of the spiral body 331, and an active torsion spring arm 333 arranged at the other end of the spiral body 331. The driven torsion spring arm 332 and the active torsion spring arm 333 both extend along the axial direction of the support shaft 340. The first stop 323 and the second stop 324 are circumferentially spaced apart on the torque output component 320, and the third stop 313 and the fourth stop 314 are circumferentially spaced apart on the torque input component 310. The driven torsion spring arm 332 is limited between the first stop 323 and the second stop 324 and can slide relative to the torque output component 320. The active torsion spring arm 333 is limited between the third stop 313 and the fourth stop 314 and can slide relative to the torque input component 310, so as to control the slipping stroke of the torque output component 320 and the torque input component 310. With such a design, after overload protection is implemented, the torsion spring 330 can be further tightened by stopping the active torsion spring arm 333 and the driven torsion spring arm 332 to hold the input connector 312 and the output connector 322 tightly to stop slipping, thereby controlling the slipping stroke of the torque output component 320 and preventing the patient from falling and getting injured.

[0056] In order to form the first stop 323 and the second stop 324, in the present embodiment, a driven limit groove 325 is circumferentially arranged on the output transmission body 321, and the driven limit groove 325 is an arc-shaped groove. The circumferential ends of the driven limit groove 325 respectively constitute the first stop 323 and the second stop 324, and the driven torsion spring arm 332 extends into the driven limit groove 325 and can slide in the driven limit groove 325. Such a design allows the first stop 323 and the second stop 324 to be arranged on the output transmission body 321, rather than being arranged on the output connecting body 322 and occupying the output connecting body 322, thereby reserving sufficient space for the torsion spring 330 to hold the output connecting body 322 tightly.

[0057] In order to form the third stopper 313 and the fourth stopper 314, an active limit groove 315 is provided on the input transmission body 311 of the present embodiment along the circumferential direction. The active limit groove 315 is an arc-shaped groove. The two circumferential ends of the active limit groove 315 respectively constitute the third stopper 313 and the fourth stopper 314. The active torsion spring arm 333 extends into the active limit groove 315 and can slide in the active limit groove 315. With such a design, the third stopper 313 and the fourth stopper 314 can be provided on the input transmission body 311, rather than being provided on the input connecting body 312 and occupying the input connecting body 312, thereby reserving sufficient space for the torsion spring 330 to hold the input connecting body 312 tightly.

[0058] It should be noted that, in the absence of overload, such as Figure 5 As shown, the driven torsion spring arm 332 abuts against the first stopper 323, and the active torsion spring arm 333 abuts against the third stopper 313, so that the direction in which the torsion spring 330 tightens the output connector 322 and the torque output component 320 bears the load torque T 负载 The direction is consistent.

[0059] If the torsion spring 330 of this embodiment is overloaded during use, the following three slipping situations may occur:

[0060] The first type of bilateral slip: Figure 6 As shown in FIG. 1 , the torque output component 320 and the torque input component 310 both slip relative to the torsion spring 330, thereby realizing the overload protection function. At this time, the distance between the driven torsion spring arm 332 and the second stopper 324 is reduced until it abuts against the second stopper 324, and the distance between the active torsion spring arm 333 and the fourth stopper 314 is reduced until it abuts against the fourth stopper 314. As the torque output component 320 is under the load torque T 负载, the second stopper 324 will push the driven torsion spring arm 332 to swing in the direction of tightening the torsion spring 330, and as the motor 100 drives the torque input component 310 to continue to rotate under the action of the torque T (i.e., rotate clockwise), the fourth stopper 314 will push the active torsion spring arm 333 to swing in the direction of tightening the torsion spring 330, so that the torsion spring 330 will hug the input connector 312 and the output connector 322 again, thereby stopping the slipping and controlling the slipping stroke of the torque output component 320 to prevent the patient from falling and getting injured; and after the torsion spring 330 hugs the input connector 312 and the output connector 322 again, the torque input component 310 can transmit the torque to the torque output component 320 through the torsion spring 330, so that the lift can be used normally.

[0061] The second active side slips: Figure 7 As shown, the torque output component 320 is held tightly by the torsion spring 330 and the two rotate synchronously, while the input connector 312 of the torque input component 310 slips relative to the torsion spring 330, thereby realizing the overload protection function. At this time, the active torsion spring arm 333 and the fourth stopper 314 move toward each other until the active torsion spring arm 333 and the fourth stopper 314 abut against each other. As the motor 100 drives the torque input component 310 to continue to rotate under the action of the torque T, the fourth stopper 314 will push the active torsion spring arm 333 to swing in the direction of tightening the torsion spring 330, so that the torsion spring 330 holds the input connector 312 again, thereby stopping the slipping of the torque input component 310 relative to the torsion spring 330, realizing the control of the slipping stroke of the torque output component 320, and preventing the patient from falling and getting injured. After the torsion spring 330 holds the input connector 312 again, the torque input component 310 can transmit the torque to the torque output component 320 through the torsion spring 330, so that the lifting machine can be used normally.

[0062] The third type of slippage on the passive side: Figure 8 As shown, the torque input component 310 is held tightly by the torsion spring 330 and the two rotate synchronously, while the output connector 322 of the torque output component 320 slips relative to the torsion spring 330, thereby realizing the overload protection function. At this time, the driven torsion spring arm 332 and the second stopper 324 move toward each other until the driven torsion spring arm 332 and the second stopper 324 abut against each other. As the torque output component 320 continues to rotate under the action of the load torque T load, the second stopper 324 pushes the driven torsion spring arm 332 to swing in the direction of tightening the torsion spring 330, so that the torsion spring 330 holds the output connector 322 tightly again, thereby stopping the slipping of the torque output component 320 relative to the torsion spring 330, realizing the control of the slipping stroke of the torque output component 320, and preventing the patient from falling and getting injured. After the torsion spring 330 holds the output connector 322 tightly again, the torque input component 310 can transmit the torque to the torque output component 320 through the torsion spring 330, so that the lift can be used normally.

[0063] It can be seen that no matter which of the above three slip situations occurs, the slip can be stopped after the overload protection is implemented to control the slip stroke of the torque output component 320 and prevent the patient from falling and getting injured.

[0064] like Figures 9 to 11 As shown, in order to enable the transfer machine to still have the overload protection function when it is used next time after the overload protection is implemented, the driven torsion spring arm 332 needs to be reset to abut against the first stopper 323, and the active torsion spring arm 333 needs to be reset to abut against the third stopper 313. In order to reset the driven torsion spring arm 332 and the active torsion spring arm 333, the transfer machine in this embodiment further includes a locking pin 500 and a joystick 600. By operating the joystick 600, the locking pin 500 can be driven to engage with the torque output component 320 to limit the rotation of the torque output component 320. Specifically, the shifting machine also includes a first support frame 700 and a second support frame 800 that are spaced relative to each other, the transmission device 300 is assembled between the first support frame 700 and the second support frame 800, the two ends of the support shaft 340 are rotatably connected to the first support frame 700 and the second support frame 800 respectively through bearings, the motor 100 is installed on the outside of the first support frame 700 and / or the second support frame 800, and a transmission shaft 900 is also rotatably connected between the first support frame 700 and the second support frame 800, and the transmission shaft 900 is provided with a synchronously rotating transmission wheel 910, the transmission wheel 910, the input transmission body 311 and the output transmission body 321 are all gears, the transmission wheel 910 is meshed with the input transmission body 311, and the output transmission body 321 is meshed with the ring gear on the drum 210, the motor 100 drives the transmission shaft 900 to rotate through the reduction box, so that the torque is transmitted to the drum 210 through the transmission wheel 910, the input transmission body 311 and the output transmission body 321 to drive the drum 210 to rotate.

[0065] The first support frame 700 in this embodiment is provided with a through hole extending axially along the support shaft 340. The locking pin 500 is arranged through the through hole and can move axially along the through hole. The locking pin 500 has a locking position engaged with the output transmission body 321 and a release position disengaged from the output transmission body 321. The locking pin 500 switches between the locking position and the release position by axial movement. The locking pin 500 includes a rod portion and a first boss 510 formed by the radial outward protrusion of the rod portion. An elastic reset element 520 is sleeved on the rod portion. The elastic reset element 520 is a cylindrical spring or a rubber spring, etc. A radially inwardly protruding shoulder surface is provided in the through hole. One end of the elastic reset element 520 abuts against the shoulder surface, and the other end abuts against the first boss 510, so as to fix the elastic reset element 520 between the first boss 510 and the shoulder surface. Under normal conditions, the elastic reset element 520 applies an elastic force to the first boss 510 in a direction away from the output transmission body 321, so that the locking pin 500 is kept in the release position. With such a design, after the operating lever 600 loses the external force, the locking pin 500 can be automatically reset and kept in the released position under normal conditions through the restoring force of the elastic reset element 520, so as to avoid limiting the rotation of the torque output component 320, thereby ensuring the normal use of the transfer machine. At the same time, the structure is also relatively simple, thereby reducing the manufacturing cost of the transmission device 300.

[0066] In order to facilitate the user to operate the operating lever 600 to drive the locking pin 500 to move to the locking position, that is, the locking pin 500 is inserted into the tooth groove of the output transmission body 321, the operating lever 600 in this embodiment is vertically extended, and a first cone disk 610 is installed at the top of the operating lever 600. The axis of the first cone disk 610 is coaxial with the operating lever 600, and the first cone disk 610 has a first cone surface that gradually shrinks downward, and the end of the rod portion of the locking pin 500 away from the output transmission body 321 is also connected to a second cone disk 530, the second cone disk 530 is coaxially arranged with the locking pin 500, and the second cone disk 530 has a second cone surface that gradually shrinks in the direction away from the locking pin 500, the first cone surface is located above the second cone surface, and the first cone surface abuts against the second cone surface, so that the first cone disk 610 and the second cone disk 530 are orthogonally matched. An L-shaped bracket 1000 is also fixedly connected to the outer side of the first support frame 700 by screws. The operating rod 600 is arranged through the bracket 1000. The part of the operating rod 600 located between the bracket 1000 and the second cone 530 is provided with a second boss 620. The second boss 620 and the operating rod 600 are integrally formed or fixed with threads. A return spring 630 is sandwiched between the second boss 620 and the transverse section of the bracket 1000. The elastic force of the return spring 630 acts on the second boss 620. 20 to drive the first cone 610 to move up and reset, one end of the joystick 600 is connected to a pull rod 640, and the pull rod 640 is pulled downward, so that the joystick 600 can drive the first cone 610 to move downward, and the first cone 610 moves downward to push the second cone 530 to drive the locking pin 500 to move axially, that is, the pulling force of the joystick 600 is converted into the axial thrust of the locking pin 500, so that the locking pin 500 moves from the release position to the locking position to limit the rotation of the output transmission body 321. It can be seen that the technical solution of this embodiment facilitates the user to operate the joystick 600 and improves the user experience.

[0067] like Fig.12As shown, the following will introduce the process of how to achieve the reset of the driven torsion spring arm 332 and the active torsion spring arm 333 when both sides slip: first, by pulling the pull rod 640, the operating lever 600 pushes the locking pin 500 to move to the locking position, that is, the locking pin 500 is inserted into the tooth groove of the output transmission body 321 to limit the rotation of the output transmission body 321, and then the motor 100 drives the torque input component 310 to rotate along the direction of the torque T' (that is, counterclockwise). Since the torsion spring 330 holds the input connecting body 312 and the output connecting body 322 tightly, the output connecting body 322 is restricted and cannot rotate. Therefore, the torque input component 310 drives the torsion spring 330 to rotate relative to the output connection body 322, so that the driven torsion spring arm 332 slides to abut against the first stopper 323 to achieve reset (as shown in Figure b), and then as the torque input component 310 continues to rotate in the counterclockwise direction, the driven torsion spring arm 332 is restricted, so the torque input component 310 rotates counterclockwise relative to the torsion spring 330, so that the active torsion spring arm 333 abuts against the third stopper 313, thereby completing the reset of the driven torsion spring arm 332 and the active torsion spring arm 333 (as shown in Figure c), so that the transfer machine after the overload protection is implemented still has the overload protection function when it is used next time. Then release the pull rod 640, the operating rod 600 moves up and resets under the action of the reset spring 630, and the locking pin 500 moves to the release position under the action of the elastic reset element 520 to release the restriction on the output transmission body 321.

[0068] It should be noted that, during the resetting process, even after the active torsion spring arm 333 abuts against the third stop 313, the torque input component 310 continues to rotate counterclockwise, causing the torsion spring 330 to expand outward. Then, after the motor 100 stops and the pull rod 640 is loosened to move the locking pin 500 to the release position, the torsion spring 330 will drive the torque output component 320 to rotate under its own restoring force and recover and re-tighten the output connector 322 and the input connector 312.

[0069] When the second slipping situation occurs, it is only necessary to reset the active torsion spring arm 333. The resetting process is as follows: pull the joystick 600 to move the locking pin 500 to the locking position to limit the rotation of the output transmission body 321. Then the motor 100 drives the torque input component 310 to rotate along the direction of the torque T' (i.e. counterclockwise). Since the driven torsion spring arm 332 is restricted, the torque input component 310 rotates counterclockwise relative to the torsion spring 330, so that the active torsion spring arm 333 is against the third stopper 313, thereby completing the resetting of the active torsion spring arm 333.

[0070] When the third slip situation occurs, it is only necessary to reset the driven torsion spring arm 332. The resetting process is as follows: pull the operating lever 600 to move the locking pin 500 to the locking position to limit the rotation of the output transmission body 321. Then the motor 100 drives the torque input component 310 to rotate along the direction of the torque T' (i.e. counterclockwise). The torque input component 310 drives the torsion spring 330 to rotate counterclockwise, so that the driven torsion spring arm 332 is against the first stopper 323, thereby completing the resetting of the driven torsion spring arm 332.

[0071] Finally, the transfer machine in this embodiment also includes a track mechanism 1100 and a host. The track mechanism 1100 adopts a conventional guide rail and is installed on the ceiling. The motor 100, the lifting device 200 and the transmission device 300 are configured on the host. The host is connected to the track mechanism 1100 and can move along the track mechanism 1100. The people and objects that need to be moved and lifted act on the rigging 220 of the lifting device 200, thereby applying a load to the torque output component 320. The load will generate a reverse torque on the torque output component 320. When the load is small, the transfer machine works normally. , the reverse torque of the load will not exceed the predetermined torque, the torsion spring 330 holds the input connector 312 and the output connector 322 to transmit the working torque, so as to realize the lifting and lowering of objects or people on the rigging 220, and the main machine can move along the track mechanism 1100, that is, the main machine can slide on the ceiling to realize the transfer of objects or people on the rigging 220; once the load is overloaded, when the torque output component 320 is subjected to the overload torque, the input connector 312 and / or the output connector 322 overcome the holding force of the torsion spring 330 and slip relative to the torsion spring 330 to implement overload protection.

[0072] It is understandable that in other embodiments of the present invention, the first stopper and the second stopper may also be protruded from the output connector and circumferentially spaced on the outer peripheral side of the output connector, and the driven torsion spring arm is located between the first stopper and the second stopper.

[0073] It is understandable that in other embodiments of the present invention, the third stopper and the fourth stopper may also be protruded from the input connector and circumferentially spaced on the outer peripheral side of the input connector, and the active torsion spring arm is located between the third stopper and the fourth stopper.

[0074] It is understandable that in other embodiments of the present invention, the input transmission body of the torque input component can also be one of a sprocket, a pulley and a friction wheel; and the output transmission body of the torque output component can also be one of a sprocket, a pulley and a friction wheel.

[0075] Embodiment 2

[0076] Compared with the first embodiment, the difference of this embodiment is that the torsion spring only includes a spiral body and a driven torsion spring arm arranged at one end of the spiral body, and no active torsion spring arm is arranged. The first stopper and the second stopper are arranged circumferentially at intervals on the torque output component, and the driven torsion spring arm is limited to slide relative to the torque output component between the first stopper and the second stopper. A driven limiting groove is arranged circumferentially on the output transmission body, and the driven torsion spring arm extends into the driven limiting groove. The circumferential ends of the driven limiting groove constitute the first stopper and the second stopper respectively. The specific implementation method can refer to the first embodiment. In the case of no overload, the driven torsion spring arm is against the first stopper, and the direction in which the torsion spring tightens the output connector is consistent with the direction in which the torque output component bears the load torque T load. The clamping force between the torsion spring and the output connector is smaller than the clamping force between the torsion spring and the input connector. Specifically, this can be achieved by at least one of the following schemes: the number of clamping turns between the torsion spring and the output connector is smaller than the number of clamping turns between the torsion spring and the input connector, the interference fit between the torsion spring and the output connector is smaller than the interference fit between the torsion spring and the input connector, and the contact area between the torsion spring and the output connector is smaller than the contact area between the torsion spring and the input connector (the steel wire cross-section of the torsion spring and the output connector is circular to form line contact, while the steel wire cross-section of the torsion spring and the input connector is square to form surface contact). When the load is overloaded, only The output connector and the torsion spring are caused to slip to implement overload protection. Then, since the direction in which the torsion spring tightens the output connector is consistent with the direction in which the torque output component is borne by the load torque, after the torque output component rotates under the action of the load torque, the driven torsion spring arm will slide to the second stop and be restricted by the second stop. As the torque output component continues to rotate under the action of the load torque, the second stop will push the driven torsion spring arm to move in the direction of tightening the torsion spring, so that the torsion spring holds the output connector again, and the slipping of the output connector relative to the torsion spring stops, thereby controlling the slipping stroke of the torque output component and preventing the patient from falling and getting injured.

[0077] Embodiment 3

[0078] Compared with the first embodiment, the difference of this embodiment is that the torsion spring only includes a spiral body and an active torsion spring arm arranged at one end of the spiral body, and does not include a driven torsion spring arm. The third stopper and the fourth stopper are arranged circumferentially at intervals on the torque input component. The active torsion spring arm is limited to slide relative to the torque input component between the third stopper and the fourth stopper. An active limiting groove is arranged circumferentially on the input transmission body. The active torsion spring arm extends into the active limiting groove. The circumferential ends of the active limiting groove constitute the third stopper and the fourth stopper respectively. The specific implementation method can refer to the first embodiment. In the case of no overload, the active torsion spring arm is against the third stopper, and the direction in which the torsion spring tightens the output connector is consistent with the direction in which the torque output component bears the load torque T load. The clamping force between the torsion spring and the input connector is smaller than the clamping force between the torsion spring and the output connector. Specifically, this can be achieved by at least one of the following schemes: the number of clamping turns between the torsion spring and the input connector is smaller than the number of clamping turns between the torsion spring and the output connector, the interference fit between the torsion spring and the input connector is smaller than the interference fit between the torsion spring and the output connector, and the contact area between the torsion spring and the input connector is smaller than the contact area between the torsion spring and the output connector (the steel wire cross-section of the torsion spring and the input connector is circular to form a line contact, while the steel wire cross-section of the torsion spring and the output connector is square to form a surface contact). When the load is overloaded, only The input connector and the torsion spring slip and overload protection is implemented. Then, since the direction in which the torsion spring tightens the output connector is consistent with the direction in which the torque output component is borne by the load torque, the torque output component rotates under the action of the load torque and drives the active torsion spring arm to move in the direction of tightening the torsion spring until it is restricted by the fourth stop. As the torque output component drives the torsion spring to continue to rotate, the active torsion spring arm is stopped, and the active torsion spring arm can be driven to tighten the torsion spring so that the torsion spring hugs the input connector again, and the slippage of the input connector relative to the torsion spring stops, thereby controlling the slippage stroke of the torque output component and preventing the patient from falling and getting injured.

[0079] Embodiment 4

[0080] Compared with embodiments one and three, the difference of this embodiment is that the torsion spring only includes a spiral body, but does not include an active torsion spring arm and a driven torsion spring arm. Such a design can achieve overload protection, but cannot control the slipping stroke of the torque output component, that is, it cannot stop slipping.

[0081] 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. A transfer machine with overload protection, comprising a motor, a lifting device and a transmission device, wherein the motor drives the lifting device to move through the transmission device, and is characterized in that: The transmission device comprises: a torque input component, comprising an input transmission body and an input connecting body that rotate synchronously, wherein the input transmission body receives power input; and A torque output component, comprising an output transmission body and an output connecting body that rotate synchronously, wherein the output transmission body outputs power; and a torsion spring, respectively holding the input connector and the output connector tightly, wherein the direction in which the torsion spring tightens the output connector is consistent with the direction in which the torque output component bears the load torque; The torque input component and the torque output component transmit torque via the torsion spring. When the torque output component is subjected to overload torque, the input connector and / or the output connector overcomes the clamping force of the torsion spring and slips relative to the torsion spring to implement overload protection.

2. The transfer machine with overload protection as claimed in claim 1, characterized in that: The transmission device further includes a support shaft, and the torque input component and the torque output component are rotatably mounted on the support shaft.

3. The transfer machine with overload protection as claimed in claim 2, characterized in that: The torque input member and the torque output member are restricted from axial displacement on the support shaft by an axial stop member.

4. The transfer machine with overload protection as claimed in claim 1, characterized in that: The torsion spring and the input connection body, and the torsion spring and the output connection body form surface contact respectively.

5. The transfer machine with overload protection as claimed in claim 1, characterized in that: The torsion spring includes a spiral body and a driven torsion spring arm arranged at one end of the spiral body. A first stop and a second stop are circumferentially spaced apart on the torque output component. The driven torsion spring arm is limited to slide relative to the torque output component between the first stop and the second stop, so as to control the slipping stroke of the torque output component.

6. The transfer machine with overload protection as claimed in claim 5, characterized in that: A driven limiting groove is circumferentially arranged on the output transmission body, the driven torsion spring arm extends into the driven limiting groove, and the two circumferential ends of the driven limiting groove constitute the first stopper and the second stopper respectively.

7. The transfer machine with overload protection as claimed in claim 1, characterized in that: The torsion spring includes a spiral body and an active torsion spring arm arranged at one end of the spiral body. A third stop and a fourth stop are circumferentially spaced apart on the torque input component. The active torsion spring arm is limited to slide relative to the torque input component between the third stop and the fourth stop, so as to control the slipping stroke of the torque input component.

8. The transfer machine with overload protection as claimed in claim 7, characterized in that: An active limiting groove is circumferentially arranged on the input transmission body, the active torsion spring arm extends into the active limiting groove, and the two circumferential ends of the active limiting groove constitute the third stopper and the fourth stopper respectively.

9. The transfer machine with overload protection as claimed in claim 1, characterized in that: The torsion spring includes a spiral body, a driven torsion spring arm arranged at one end of the spiral body, and an active torsion spring arm arranged at the other end of the spiral body. A first stop and a second stop are circumferentially spaced apart on the torque output component, and a third stop and a fourth stop are circumferentially spaced apart on the torque input component. The driven torsion spring arm is limited to slide relative to the torque output component between the first stop and the second stop, and the active torsion spring arm is limited to slide relative to the torque input component between the third stop and the fourth stop, so as to control the slipping stroke of the torque output component and the torque input component.

10. The transfer machine with overload protection as claimed in claim 9, characterized in that: The transfer machine further comprises a locking pin and an operating rod, wherein the operating rod drives the locking pin to engage with the torque output component to limit its rotation.

11. The transfer machine with overload protection according to claim 10, characterized in that: The locking pin is arranged to move along the axial direction of the torque output component between a locking position for engaging with the torque output component and a releasing position for disengaging from the torque output component, and the locking pin is abutted by an elastic return element and normally maintained at the releasing position.

12. The transfer machine with overload protection according to claim 11, characterized in that: The operating rod is provided with a first cone disk, and the locking pin is provided with a second cone disk. The first cone disk and the second cone disk cooperate orthogonally to convert the pulling force of the operating rod into the axial thrust of the locking pin, so as to drive the locking pin to move to the locking position.

13. The transfer machine with overload protection as claimed in 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.

14. The transfer machine with overload protection according to claim 1, characterized in that: The lifting device comprises a drum and a rigging wound on the drum. The motor drives the drum to rotate through the transmission device, and the rotating motion of the drum drives the rigging to be lifted and lowered.

15. The transfer machine with overload protection as claimed in claim 1, characterized in that: The transfer machine comprises a track mechanism and a main machine, the motor, the lifting device and the transmission device are arranged on the main machine, and the main machine is connected to the track mechanism and can move along the track mechanism.

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