CN119910621B - A compliant back-drive parallel robot and working method - Google Patents

A compliant back-drive parallel robot and working method

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Publication number
CN119910621B
CN119910621B CN202510077892.3A CN202510077892A CN119910621B CN 119910621 B CN119910621 B CN 119910621B CN 202510077892 A CN202510077892 A CN 202510077892A CN 119910621 B CN119910621 B CN 119910621B
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rod
platform
driven
stepped shaft
drive
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CN119910621A (en
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于晓霞
韩斐
黄华贵
姚春东
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Yanshan University
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Yanshan University
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Abstract

本发明涉及工业机器人技术领域,具体为一种柔顺反驱动并联机器人及工作方法,包括静平台,静平台包括底座,底座通过直筒与中间平台连接,直筒的圆周外侧设有多台驱动电机,驱动电机通过皮带传动机构与位于中间平台的阶梯轴连接;中间平台,包括连接在支板上表面的轴承座,阶梯轴活动连接在轴承座内,阶梯轴的输入端通过皮带传动机构与驱动电机连接,输出端连接主动杆的近端,主动杆的远端依次与垂直布置的虎克铰、从动杆和球铰连接,球铰与动平台的下底面边缘连接,从动杆内设有弹簧减震机构;动平台用于连接执行器。中间平台和动平台之间形成的反驱动结构使机器人具有较好的柔顺性,能够在与外部环境或人类交互时适应不同的物理条件。

The present invention relates to the field of industrial robot technology, specifically a compliant counter-drive parallel robot and a working method, comprising a static platform, the static platform including a base connected to an intermediate platform via a straight cylinder, a plurality of drive motors disposed on the outer circumference of the straight cylinder, the drive motors being connected to a stepped shaft located on the intermediate platform via a belt drive mechanism; the intermediate platform including a bearing seat connected to the upper surface of a support plate, the stepped shaft movably connected within the bearing seat, the input end of the stepped shaft being connected to the drive motor via a belt drive mechanism, the output end being connected to the proximal end of an active rod, the distal end of the active rod being sequentially connected to a vertically arranged Hooke's joint, a driven rod, and a ball joint, the ball joint being connected to the lower bottom edge of the dynamic platform, the driven rod being provided with a spring damping mechanism; and the dynamic platform being used to connect to an actuator. The counter-drive structure formed between the intermediate platform and the dynamic platform gives the robot excellent compliance, enabling it to adapt to different physical conditions when interacting with the external environment or humans.

Description

Flexible reverse-drive parallel robot and working method
Technical Field
The invention relates to the technical field of industrial robots, in particular to a compliant anti-driving parallel robot and a working method thereof.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In the field of industrial robots, parallel robots have significant advantages over serial robots in terms of stiffness, load capacity, accuracy, and load capacity.
Under the existing production and manufacturing conditions, the large unsafe interaction force generated by the contact of the robot and the environment is reduced, and two safety guaranteeing modes exist, namely, one is to install a precise moment sensor between the robot and the contacted environment, and the other is to reduce the mechanical impedance of the robot through direct driving. Both of the above methods can improve the safety of the robot in interaction with the environment, but in the former solution, the cost of the sensor is relatively high, and in the second method, the safety can be improved, but the force provided by the method to the robot is limited, and the use requirement cannot be met.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a flexible anti-driving parallel robot and a working method, which can ensure the safety of machines and workers in a working state, and have the characteristics of high rigidity, excellent precision, strong bearing capacity, excellent operation performance and the like, and are mainly used in various places with small industrial production and complex working environment, including the fields of actual carrying, stacking and metal processing of various projects.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a first aspect of the present invention provides a compliant counter-drive parallel robot comprising:
The static platform comprises a base, wherein the base is connected with the middle platform through a straight cylinder, a plurality of driving motors are arranged on the outer side of the circumference of the straight cylinder, and the driving motors are connected with a stepped shaft positioned on the middle platform through a belt transmission mechanism;
The middle platform comprises a bearing seat connected to the upper surface of the support plate, the stepped shaft is movably connected in the bearing seat, the input end of the stepped shaft is connected with the driving motor through the belt transmission mechanism, the output end of the stepped shaft is connected with the proximal end of the driving rod, the distal end of the driving rod is sequentially connected with a Hooke hinge, a driven rod and a spherical hinge which are vertically arranged, the spherical hinge is connected with the edge of the lower bottom surface of the movable platform, and a spring damping mechanism is arranged in the driven rod;
and the movable platform is used for connecting with the actuator.
Further, the stationary platform, the intermediate platform and the movable platform are located on the same axis.
Further, every two driving motors are in a group, a plurality of groups of driving motors are uniformly distributed on the upper surface of the base around the circumference of the straight cylinder, and each driving motor is provided with a corresponding stepped shaft, a driving rod, a hook hinge, a driven rod and a spherical hinge.
Further, the belt transmission mechanism comprises a driving wheel and a driven wheel which are connected through a belt, the driving wheel is connected with the output end of the driving motor, and the driven wheel is connected with the input end of the stepped shaft.
Further, the driving rod comprises a proximal end and a distal end, the proximal end of the driving rod is connected with the output end of the stepped shaft, and the input end of the stepped shaft is connected with the driven wheel.
Further, the Hooke's joint comprises hinge bodies respectively connected with the driving rod and the driven rod, the two groups of hinge bodies are movably connected through universal joints, and universal joint shaft sleeves are arranged on the outer sides of the universal joints.
Further, the driven rod comprises a connecting rod, one end of the connecting rod is sleeved with a spring and positioned in the shell to form a spring damping mechanism, two ends of the spring are provided with baffle plates, the other end of the connecting rod is connected with the spherical hinge, and the shell is connected with the Hooke hinge.
Further, the ball hinge comprises a ball head seat connected with the driven rod, the ball head seat is movably connected with the ball head rod, the ball head rod is connected with the movable platform through a connecting piece, and the ball head rod is provided with a ball head cover plate and a dust cover.
Further, the movable platform comprises an actuator mounting seat and an actuator, and the edge of the lower bottom surface of the actuator mounting seat is connected with a corresponding spherical hinge through a connecting piece.
The second aspect of the invention provides a working method of a compliant counter-drive parallel robot, comprising the following steps:
when the movable platform bears impact, the spring damping mechanism in the driven rod acts to absorb the impact;
When the impact force exceeds the maximum damping effect of the spring damping mechanism in the driven rod, the impact force is sequentially transmitted to the hook joint and the driving rod in a pressure mode, the driving rod drives the stepped shaft to reversely rotate, and the driving motor is driven to reversely rotate through the driving belt pulley, so that reverse driving is realized.
Compared with the prior art, the above technical scheme has the following beneficial effects:
1. The anti-driving structure is formed between the middle platform and the movable platform, so that the robot has better flexibility and can adapt to different physical conditions when interacting with an external environment or human beings. When the impact force exceeds the maximum damping effect of the spring damping mechanism in the driven rod, the impact force is sequentially transmitted to the Hooke hinge and the driving rod in a pressure mode, the driving rod drives the stepped shaft to reversely rotate, and the driving motor is driven to reversely rotate through the driving belt pulley to realize reverse driving. The counter-drive arrangement may reduce or stop the application of force when the robot encounters an obstacle or comes into contact with a person, thereby reducing the risk of injury to the person or equipment. The spring damping mechanism mounted in the driven rod can also reduce the damage to the machine structure and operators when the robot faces the impact.
2. The robot is provided with moment by the driving motor, a traditional speed reducer is abandoned, the transmission and torque increase of the torque are completed by the belt pulley with a certain transmission ratio, the belt pulley has good shock resistance and buffering capacity, mechanical vibration is effectively reduced in the movement process, the movement is more stable, and in addition, the transmission efficiency of the belt pulley transmission system is high, the structure is simple, and the installation and the maintenance are convenient. And the belt has small friction and small relative energy loss in the transmission process.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of the overall structure of a counter-drive parallel robot provided by one or more embodiments of the present invention;
FIG. 2 is a schematic diagram of a front view of a counter-drive parallel robot according to one or more embodiments of the present disclosure;
FIG. 3 is a schematic diagram of a multi-platform architecture provided by one or more embodiments of the present invention;
FIG. 4 is a schematic diagram of a connection structure between an intermediate platform and an upper platform according to one or more embodiments of the present invention;
FIG. 5 is a schematic diagram of a drive pulley configuration provided by one or more embodiments of the present invention;
FIG. 6 is a schematic view of an assembled structure of a stepped shaft in a bearing housing provided in accordance with one or more embodiments of the present invention;
FIG. 7 is a schematic diagram of a Hooke's joint structure provided by one or more embodiments of the present invention;
FIG. 8 is a schematic cross-sectional view of a follower rod provided in accordance with one or more embodiments of the present invention;
FIG. 9 is a schematic cross-sectional view of a spherical hinge according to one or more embodiments of the present invention;
The device comprises a 1-base, a 2-straight cylinder, a 3-driving motor, a 4-driving pulley, a 41-driving wheel, a 42-belt, a 43-driven wheel, a 5-bearing, a 6-bearing seat, a 61-bearing base, a 62-bearing end cover, a 7-hook hinge, a 71-hinge body, a 72-universal joint sleeve, a 73-universal joint, an 8-driven rod, a 81-connecting rod, a 82-spring, a 83-baffle, a 84-shell, a 9-spherical hinge, a 91-spherical seat, a 92-spherical rod, a 93-spherical cover plate, a 94-dust cover, a 10-connecting piece, a 11-actuator, a 12-driving rod, a 13-stepped shaft, a 131-shaft sleeve and a 14-support plate.
Detailed Description
The invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It should be noted that the terminology herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments in accordance with the invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Term interpretation:
Hooke Joint, also known as a universal hinge or ball hinge, is a mechanical connection component capable of achieving multiple degrees of freedom rotation.
Back-drive robots refer to some kind of inverse characteristic or capability of the robot drive system. In a motor drive system, reverse drivability describes whether the motion can be reversed easily, depending on the efficiency of the drive motion and the overall actuator mechanical resistance. When the robot has reverse driving capability, it may be able to more easily achieve reversal of the motion, or in some cases, drive it by an external force or signal.
For example, when the back driving mode is adopted, the robot is allowed to back drive a mechanical arm or a tool carried by the robot through external operation (such as operation of a doctor), so that finer and more flexible operation is realized.
As described in the background art, under the existing production and manufacturing conditions, the large unsafe interaction force generated by the contact between the robot and the environment is generally reduced by adding a moment sensor or reducing the mechanical impedance of the robot by direct driving, and the moment sensor has relatively high cost.
Therefore, the following embodiment provides a flexible anti-driving parallel robot and a working method, which can ensure the safety of machines and workers in a working state, and has the characteristics of high rigidity, excellent precision, strong bearing capacity, excellent operation performance and the like, and is mainly used in various places with small industrial production and complex working environment, including the fields of actual carrying, stacking and metal processing of various projects.
Embodiment one:
As shown in fig. 1-2, a compliant counter-drive parallel robot includes a stationary platform (lower platform), a middle platform (support platform), and a movable platform (upper platform).
The static platform comprises a base 1, a straight cylinder 2 is arranged in the center of the upper surface of the base 1, a plurality of driving motors 3 are arranged on the outer side of the circumference of the straight cylinder 2, and the driving motors 3 transmit power to a stepped shaft 13 positioned on the middle platform through a transmission belt pulley 4.
The middle platform comprises a bearing seat 6 connected to the upper surface of a support plate 14, a stepped shaft 13 is movably connected to the bearing seat 6 through a bearing 5, the input end of the stepped shaft 13 receives power transmitted by a driving motor 3, the output end of the stepped shaft is connected with the proximal end of a driving rod 12, the distal end of the driving rod 12 is sequentially connected with a Hooke joint 7, a driven rod 8 and a spherical hinge 9, and the spherical hinge 9 is connected with the lower bottom surface of the movable platform through a connecting piece 10.
The movable platform is used for connecting corresponding end execution structures and comprises an actuator 11, and the lower surface of a mounting seat of the actuator 11 is movably connected with the spherical hinge 9 through a connecting piece 10.
As shown in fig. 3, the main structure of the static platform (lower platform) is a base 1, the base 1 is connected with the main structure (support plate 14) of the middle platform (support platform) through a straight cylinder 2, and the moving platform (upper platform) is an actuator 11 and a corresponding mounting seat.
The middle platform (supporting platform) and the movable platform (upper platform) are movably connected through RUS mechanisms formed by the bearing seat 6, the driving rod 12, the hook hinge 7, the driven rod 8 and the spherical hinge 9, and the number of the RUS mechanisms corresponds to that of the driving motor 3. In this embodiment, the straight cylinders 2 are fixedly connected with the center of the base 1, the driving motors 3 are grouped around the straight cylinders 2, 6 driving motors 3 form three groups, are uniformly distributed on the upper surface of the base 1 at 120 degrees, are grouped around the straight cylinders 2 as well as the corresponding bearing seats 6, stepped shafts 13, driving rods 12, hooke hinges 7, driven rods 8 and spherical hinges 9 of the driving motors 3, and are uniformly distributed on the upper surfaces of the respective mounting seats at 120 degrees to form a parallel robot of a 6-RUS mechanism, so that the moving platform and the actuator 11 can bear impacts from various directions.
The RUS mechanism in this embodiment is a mechanism formed by sequentially connecting a revolute pair (Revolute joint) -a hook joint (or referred to as a Universal joint) -a ball joint (SPHERICAL JOINT). The specific structure is shown in fig. 4, the input end of the stepped shaft 13 receives the rotation motion from the driving motor 3 through the driving belt pulley 4, the stepped shaft 13 realizes the rotation motion in the bearing seat 6 through the bearing 5, and the output end of the stepped shaft 13 is connected with the proximal end of the driving rod 12. The far end of the driving rod 12 is connected with the driven rod 8 through the hook joint 7, and the other end of the driven rod 8 is connected with the movable platform through the spherical joint 9. The number of the moving mechanisms between the middle platform (supporting platform) and the movable platform (upper platform) corresponds to that of the driving motor 3, when the movable platform receives impact, a spring in the driven rod 8 can absorb part of the impact, when the impact exceeds the damping capacity of the spring, the driven rod 8 is pressed, the generated linear displacement is transmitted to the far end of the driving rod 12 through the Hooke hinge 7, the far end of the driving rod 12 swings around the near end of the driving rod 12, the near end of the driving rod 12 drives the stepped shaft 13 to rotate, and the stepped shaft 13 drives the driving motor 3 to rotate reversely through the transmission belt pulley 4, so that reverse driving is realized. The process is used for counteracting various impacts, so that the safety of the robot in environment interaction is improved, and the impact direction is uncertain, so that 6 groups of RUS mechanisms are connected in parallel as much as possible to cope with more comprehensive impacts.
In this embodiment, the driving motor 3 is a servo motor, and the driving pulley 4 is a V-shaped pulley with a transmission ratio of 3.
As shown in fig. 5, the output end of the driving motor 3 is connected to a driving pulley 41 of the transmission pulley 4, and the driving pulley 41 is connected to a driven pulley 43 via a belt 42.
As shown in fig. 6, the driven wheel 43 is connected to the input end of the stepped shaft 13, and the output end of the stepped shaft 13 is connected to the proximal end of the driving rod 12.
In this embodiment, the driving motor 3 is connected to the driving wheel 41 by a key, the driven wheel 42 is connected to the stepped shaft 13 by a key, and the stepped shaft 13 is connected to the driving lever 12 by a key.
In this embodiment, the bearing 5 is a NU10000 cylindrical roller bearing.
In this embodiment, the bearing housing 6 is a split bearing housing, and includes a bearing base 61 and a bearing end cover 62.
In this embodiment, the outer side of the stepped shaft 13 is sleeved with a shaft sleeve 131, and the shaft sleeve 131 is connected with the bearing 5.
Every two bearing seats 6 are in one group, and are in one-to-one correspondence with the driving pulleys 4 of the static platform, and the bearings 5 are arranged in the bearing seats 6 and are connected with the stepped shafts 13.
As shown in fig. 7, the hook joint 7 is connected with the driving rod 12 and the driven rod 8, the hook joint 7 comprises hinge bodies 71 respectively connected with the driving rod 12 and the driven rod 8, the two groups of hinge bodies 71 are movably connected through universal joints 73, and universal joint shaft sleeves 72 are arranged outside the universal joints 73.
The driven lever 8 is internally provided with a spring damper mechanism for reducing the impact force. As shown in fig. 8, the driven rod 8 includes a connecting rod 81, one end of the connecting rod 81 is sleeved with a spring 82 and is located in a housing 84, two ends of the spring 82 are provided with baffles 83, the other end of the connecting rod 81 is connected with the spherical hinge 9, and the housing 84 is connected with the hook hinge 7. The spring 82 and the baffle 83 are used for reducing impact on mechanical structure and injury to operators when the actuator 11 is impacted by external load.
The driven rod 8 is connected with the movable platform through the spherical hinge 9, the structure of the spherical hinge 9 is shown in fig. 9, the structure comprises a ball seat 91 connected with the driven rod 8, the ball seat 91 is movably connected with a ball rod 92, the ball rod 92 is connected with the movable platform through a connecting piece 10, and a ball cover plate 93 and a dust cover 94 are arranged on the ball rod 92.
The robot is provided with moment by the driving motor, a traditional speed reducer is abandoned, the transmission and torque increase of the torque are completed by the belt pulley with a certain transmission ratio, the belt pulley has good shock resistance and buffering capacity, mechanical vibration is effectively reduced in the movement process, the movement is more stable, and in addition, the transmission efficiency of the belt pulley transmission system is high, the structure is simple, and the installation and the maintenance are convenient. And the belt has small friction and small relative energy loss in the transmission process. When the belt pulley is impacted, the characteristic that the speed reducer cannot reversely move is changed, the external impact force can be changed into the rotation of the motor, the unloading effect is achieved, and the safety of equipment can be protected.
The robot has better flexibility and can adapt to different physical conditions when interacting with an external environment or human beings. If the robot encounters an obstacle or comes into contact with a person, the application of force may be reduced or stopped with its unique counter-drive configuration, thereby reducing the risk of injury to the person or equipment. The spring damping mechanism mounted in the driven rod can also reduce the damage to the machine structure and operators when the robot faces the impact.
Embodiment two:
A working method of a flexible reverse-drive parallel robot comprises the following steps:
In the normal working process, the driving motor 3 provides power to drive the belt pulley 4 to move, the stepped shaft 13 transmits the power from the belt pulley 4 to the driving rod 12, the driving rod 12 and the hook joint 7 further transmit the power to the driven rod 8, and finally 6 supporting legs cooperate to enable the actuator 11 to complete the preset action.
When the movable platform bears impact, firstly, the force is transferred to the spherical hinge 9, and as the spherical hinge 9 has a multi-degree-of-freedom motion state, the position relation between the spherical head rod 92 and the spherical head seat 91 can be changed when the spherical head rod is pressed, so that the force can be transferred to an internal spring without the requirement that the driven rod 8 keeps a certain position state, and at the moment, a spring damping mechanism in the driven rod 8 plays a role to absorb the impact;
When the impact force exceeds the maximum damping effect of the spring damping mechanism in the driven rod 8, the impact force is sequentially transmitted to the hook joint 7 and the driving rod 12 in a pressure mode, the driving rod 12 drives the stepped shaft 13 to reversely rotate, the driving motor 3 is driven to reversely rotate through the driving belt pulley 4, reverse driving is realized, and finally, the impact received by the outside is reduced and eliminated in a motor rotation mode, so that various impacts are counteracted in the process, and the safety of equipment in abnormal collision is maintained.
The action process of the spring damping mechanism of the driven rod 8 comprises the following steps:
a. The actuator 11 receives load of external environment or accidental collision of operators, so that the movable platform bears pressure;
b. The movable platform drives the connecting rod 81 to move, the connecting rod 81 simultaneously compresses the spring 82, and the baffle 83 limits the displacement of the spring 82, so that damping failure is avoided;
In the compression process of the spring 82, a certain pretightening force is applied to the spring, so that the phenomenon of insufficient shock absorption caused by the weight of an upper mechanism and the weight of the spring is avoided in the working state;
c. the spring 82 is now in compression and returns to its original position when the external impact is removed.
The specific implementation method of the back drive comprises the following steps:
a. the driven rod 8 is again subjected to pressure, the impact force at this time having exceeded the maximum damping effect of the spring;
b. The Hooke's joint 7 receives pressure, and this pressure further transmits driving lever 12, and driving lever 12 drives step shaft 13 reverse rotation, and then drives driving motor 3 through driving pulley 4 and reverses to this process offsets various impact that receive.
The driving motor in the embodiment has two functions, namely, the first function is to provide initial power for the mechanism under normal working conditions, and the second function is to transmit impact force to the driving motor to enable the driving motor to reversely rotate when the driving motor is impacted, so that the impact force is counteracted, and safety is guaranteed.
During the process that the impact force is transmitted to the Hooke's joint and the driving rod in a pressure mode through the driven rod, since the spherical hinge 9 has a multi-degree-of-freedom motion state, the spherical head rod 92 can change the position relation with the spherical head seat 91 when the spherical head rod is stressed, so that the force can be transmitted to the internal spring without the requirement that the driven rod 8 keeps a certain position state, and the impact is absorbed. This embodiment shows the motion state of the mechanism at a certain stage.
The back driving is mainly to convert external impact into reverse rotation of the motor, so that the impact on the whole mechanism is reduced, and the back driving has important significance for maintaining the safety and stability of the mechanism. Meanwhile, for operators, the impact on the actuator is prevented from being transmitted to the operators by the mechanism due to the design of back driving, and the injury to the operators can be effectively reduced. On the other hand, if operators bump into the mechanism carelessly, the whole parallel robot is similar to a large spring through the designed spring damping and back driving mode, so that the damage to human bodies can be effectively reduced.
In summary, the robot has better flexibility and can adapt to different physical conditions when interacting with external environment or human beings. If the robot encounters an obstacle or comes into contact with a person, the application of force may be reduced or stopped with its unique counter-drive configuration, thereby reducing the risk of injury to the person or equipment. The spring damping mechanism mounted in the driven rod can also reduce the damage to the machine structure and operators when the robot faces the impact.
The robot is provided with moment by the driving motor, a traditional speed reducer is abandoned, the transmission and torque increase of the torque are completed by the belt pulley with a certain transmission ratio, the belt pulley has good shock resistance and buffering capacity, mechanical vibration is effectively reduced in the movement process, the movement is more stable, and in addition, the transmission efficiency of the belt pulley transmission system is high, the structure is simple, and the installation and the maintenance are convenient. And the belt has small friction and small relative energy loss in the transmission process. When the belt pulley is impacted, the characteristic that the speed reducer cannot reversely move is changed, the external impact force can be changed into the rotation of the motor, the unloading effect is achieved, and the safety of equipment can be protected.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1.一种柔顺反驱动并联机器人,其特征在于,包括:1. A compliant back-drive parallel robot, comprising: 静平台,包括底座,底座通过直筒与中间平台连接,直筒的圆周外侧设有多台驱动电机,驱动电机通过皮带传动机构与位于中间平台的阶梯轴连接;The static platform includes a base, which is connected to the middle platform through a straight cylinder. A plurality of drive motors are provided on the outer side of the circumference of the straight cylinder, and the drive motors are connected to the stepped shaft located on the middle platform through a belt transmission mechanism. 中间平台,包括连接在支板上表面的轴承座,阶梯轴活动连接在轴承座内,阶梯轴的输入端通过皮带传动机构与驱动电机连接,输出端连接主动杆的近端,主动杆的远端依次与垂直布置的虎克铰、从动杆和球铰连接,球铰与动平台的下底面边缘连接,从动杆内设有弹簧减震机构;The intermediate platform includes a bearing seat connected to the upper surface of the support plate, a stepped shaft movably connected in the bearing seat, an input end of the stepped shaft connected to the drive motor through a belt transmission mechanism, an output end connected to the proximal end of the active rod, and a distal end of the active rod connected to a vertically arranged Hooke's hinge, a driven rod, and a ball hinge in sequence, the ball hinge connected to the lower bottom edge of the moving platform, and a spring shock-absorbing mechanism provided in the driven rod; 从动杆包括连杆,连杆一端套接弹簧并位于壳体内形成弹簧减震机构,弹簧两端设有挡板,连杆另一端与球铰连接,壳体与虎克铰连接;The driven rod includes a connecting rod, one end of which is sleeved with a spring and located in a housing to form a spring damping mechanism, baffles are provided at both ends of the spring, the other end of the connecting rod is connected to a ball joint, and the housing is connected to a Hooke's hinge; 动平台,用于连接执行器;Dynamic platform, used to connect the actuator; 当动平台承受冲击时,从动杆内的弹簧减震机构动作,吸收冲击;When the moving platform is subjected to impact, the spring shock-absorbing mechanism in the driven rod is activated to absorb the impact; 当冲击力超过从动杆内弹簧减震机构的最大减震效果时,冲击力以压力方式依次传递给虎克铰和主动杆,主动杆带动阶梯轴反向转动,再经传动皮带轮带动驱动电机反转,实现反驱动。When the impact force exceeds the maximum damping effect of the spring damping mechanism in the driven rod, the impact force is transmitted to the Hook hinge and the active rod in sequence in the form of pressure. The active rod drives the stepped shaft to rotate in the opposite direction, and then drives the drive motor to reverse through the transmission pulley to achieve reverse drive. 2.如权利要求1一种柔顺反驱动并联机器人,其特征在于,所述静平台、中间平台和动平台位于同一轴线上。2. A compliant back-drive parallel robot as claimed in claim 1, characterized in that the static platform, the intermediate platform and the dynamic platform are located on the same axis. 3.如权利要求1一种柔顺反驱动并联机器人,其特征在于,所述驱动电机每两台为一组,多组驱动电机围绕直筒圆周均布在底座上表面,每一台驱动电机具有相对应的阶梯轴、主动杆、虎克铰、从动杆和球铰。3. A compliant counter-driven parallel robot as claimed in claim 1, characterized in that the drive motors are grouped in pairs, and multiple groups of drive motors are evenly distributed on the upper surface of the base around the circumference of the straight cylinder, and each drive motor has a corresponding stepped shaft, active rod, Hooke's joint, driven rod and ball joint. 4.如权利要求1一种柔顺反驱动并联机器人,其特征在于,所述皮带传动机构包括通过皮带连接的主动轮与从动轮,主动轮连接驱动电机的输出端,从动轮连接阶梯轴的输入端。4. A compliant counter-drive parallel robot according to claim 1, characterized in that the belt transmission mechanism includes a driving wheel and a driven wheel connected by a belt, the driving wheel is connected to the output end of the driving motor, and the driven wheel is connected to the input end of the stepped shaft. 5.如权利要求1一种柔顺反驱动并联机器人,其特征在于,所述主动杆包括近端和远端,主动杆近端与阶梯轴的输出端连接,阶梯轴的输入端连接从动轮。5. A compliant back-drive parallel robot as claimed in claim 1, characterized in that the active rod includes a proximal end and a distal end, the proximal end of the active rod is connected to the output end of the stepped shaft, and the input end of the stepped shaft is connected to the driven wheel. 6.如权利要求1一种柔顺反驱动并联机器人,其特征在于,所述虎克铰包括分别与主动杆与从动杆连接的铰链体,两组铰链体之间通过万向节活动连接,万向节外侧设有万向节轴套。6. A compliant back-driven parallel robot as claimed in claim 1, characterized in that the Hooke's joint includes hinge bodies respectively connected to the active rod and the driven rod, the two sets of hinge bodies are movably connected by a universal joint, and a universal joint sleeve is provided on the outer side of the universal joint. 7.如权利要求1一种柔顺反驱动并联机器人,其特征在于,所述球铰包括与从动杆连接的球头座,球头座与球头杆活动连接,球头杆通过连接件与动平台连接,球头杆上设有球头盖板和防尘罩。7. A compliant back-driven parallel robot as claimed in claim 1, characterized in that the ball joint includes a ball head seat connected to the driven rod, the ball head seat is movably connected to the ball head rod, the ball head rod is connected to the moving platform through a connecting piece, and a ball head cover and a dust cover are provided on the ball head rod. 8.如权利要求1一种柔顺反驱动并联机器人,其特征在于,所述动平台包括执行器安装座和执行器,执行器安装座下底面边缘通过连接件与相应的球铰连接。8. A compliant back-driven parallel robot according to claim 1, characterized in that the moving platform includes an actuator mounting seat and an actuator, and the bottom edge of the actuator mounting seat is connected to the corresponding ball joint through a connecting piece.
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