A size-adjustable centering tool

Abstract

The present invention relates to a size-adjustable centering tool, which at least comprises: a support shaft frame, a driving unit and a positioning unit, wherein the driving unit is rotatably arranged outside the hub of the support shaft frame in a coaxial manner with the support shaft frame, and the positioning unit is connected to the driving unit in a meshing manner, and when the driving unit is acted upon by a force and rotates, the positioning unit is driven by the rotation energy of the driving unit to shift, so that several shifting components in the positioning unit shift equidistantly in a radial direction centered on the axis of the support shaft frame, wherein when several moving components of the positioning unit move equidistantly in the radial direction and contact the end of the positioning object, the moving components are limited by the end of the positioning object so that the axis of the shaft hole of the support shaft frame coincides with the axis of the positioning object. The centering tool of the present invention can realize centering not at the center of the centering object, and ensure the consistency and stability of batch centering object detection.

Description

Technical Field

[0001] The invention relates to the technical field of robot detection, and in particular to a centering tool with adjustable size. Background Art

[0002] With the replacement of humans by machines and the deepening of intelligent manufacturing, the demand for precision reducers for robots in the industrial field is increasing, and various new types of precision reducers are emerging one after another. Precision reducers are one of the three core components of industrial robots. Their performance determines the quality and service life of robots, so it is necessary to test their performance. The performance of precision reducers is usually tested by detectors, mainly horizontal magnetic powder comprehensive performance detectors, electric comprehensive performance detectors, and hydraulic comprehensive performance detectors. These detectors can usually only detect certain performance items of reducers, such as efficiency, rotation torque, temperature rise, and noise. Other performance items such as hysteresis and overturning torque require other testing instruments. This type of testing instrument usually requires more than two assemblers to cooperate with each other to complete the pre-test preparation work when testing and installing reducers. The work efficiency is low, and there are also problems of human installation errors. In order to overcome the above shortcomings, the new precision reducer comprehensive performance detector has added hysteresis detection on the basis of traditional performance testing items, realizing one-stop detection of the main indicators of the reducer and improving the detection efficiency, but the centering requirements of the detector are significantly increased. Especially when the input shaft gear of the precision reducer is an involute gear, when it meshes with the involute gear in the precision reducer, due to the separability of the involute gear transmission, there is a certain side clearance between the gears. Therefore, when the input shaft gear is inserted into the reducer and drives the precision reducer to transmit, the input shaft gear tends to deviate to one side of the meshing gears rather than the center, resulting in inaccurate, unstable and poor consistency of the test results. This inaccuracy has a greater impact on the backlash measurement results.

[0003] This problem exists not only in the above-mentioned detectors, but also in the case of workers who manually assemble the reducer, usually use the input shaft gear to drive the reducer to move, and preliminarily judge the quality of the reducer by sensing the smoothness of the input shaft gear operation, commonly known as the feel. This is also the case because the assembler manually inserts the input shaft gear into the reducer and drives the reducer to rotate. At this time, even if the input shaft gear is slightly eccentric when inserted into the reducer, it will drive the reducer to operate. Obviously, different people will have different feelings and feel for the same reducer. In order to solve the above problems, an input shaft gear centering tool is urgently needed.

[0004] There are many traditional centering tools, such as centering chucks, centering vises, center correction modules, etc. These devices use their own centers as the reference for centering the clamped object, and the centering tool and the clamped object are in close contact. The centering tool for reducer performance testing uses the reducer's own positioning ring as the reference for centering, and the input shaft gear is inserted into it at the center position of the reducer centering. There is a side clearance between the input shaft gear and the reducer gear, so these commonly used centering tools are not suitable for reducer centering testing.

[0005] For example, patent document CN211720418U discloses a coaxial centering structure of the motor shaft and the reducer shaft in an electric drive assembly, including: a housing, a motor and a reducer, wherein the motor is provided with a motor shaft; the reducer is provided with a reducer shaft, and the motor shaft and the reducer shaft are coaxially connected in transmission, and radial centering is performed by providing a coaxial centering surface at the connecting end between the motor shaft and the reducer shaft to ensure that the motor shaft and the reducer shaft are coaxial and concentric. This patent can reduce the machining accuracy requirements of the transmission components in the electric drive assembly, reduce the wear of the transmission components, increase the service life of the electric drive assembly, and improve the NVH effect. However, the patent is complicated to operate and still requires operators to perform precise inspections.

[0006] The present invention hopes to provide a centering tool which is easy to operate.

[0007] In addition, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the applicant studied a large number of documents and patents when making the present invention, but due to space limitations, not all details and contents are listed in detail. However, this does not mean that the present invention does not have the characteristics of these prior arts. On the contrary, the present invention already has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art to the background technology. Summary of the invention

[0008] When testing and installing a reducer, the detection instruments in the prior art usually require more than two assemblers to cooperate with each other to complete the pre-test preparation work, which has low work efficiency and also has the problem of human installation errors. In order to overcome the above shortcomings, the new precision reducer comprehensive performance tester has added backlash detection on the basis of traditional performance testing items, realizing one-stop detection of the main indicators of the reducer, improving the detection efficiency, but the centering requirements of the detector are significantly increased. In particular, when the input shaft gear of the precision reducer is an involute gear, when it meshes with the involute gear in the precision reducer, due to the separability of the involute gear transmission, there is a certain side clearance between the gears. Therefore, when the input shaft gear is inserted into the reducer and drives the precision reducer to drive, the input shaft gear often deviates to the side of the meshing gear rather than the center, resulting in inaccurate, unstable and poor consistency of the test results. This inaccuracy has a greater impact on the backlash measurement results.

[0009] In the past, all the self-centering devices used their own centers as the reference to center the clamped object, and the centering tool and the clamped object were in close contact. The present invention provides a reducer performance detection centering tool, which does not use the center position of the centering device as the centering reference, but uses the positioning ring of the clamped reducer itself as the centering reference. Through the double-needle elastic positioning contact of the circular cross fork frame, the positioning device quickly and accurately determines the center position of the input shaft gear and the reducer, thereby realizing the rapid center positioning between a pair of parts with side clearance, effectively improving the assembly quality and detection efficiency of the precision reducer. At the same time, because the manufacturing reference, installation reference and detection reference are the same reference, it not only provides a basis for analyzing the processing quality and assembly quality of the core components of a single precision reducer, but also can greatly improve the accuracy, stability and consistency of the batch performance detection results of the precision reducer. Further, considering the large number of types and models of precision reducers, the present invention designs a centering tool with adjustable size, and realizes the adjustable size of the centering tool by driving multiple synchronous gears and racks through the support ring gear, meeting the diversity and personalized performance detection requirements of the reducer.

[0010] In view of the deficiencies in the prior art, the present invention provides a size-adjustable centering tool, characterized in that it comprises at least: a supporting shaft frame, a driving unit and a positioning unit, wherein the driving unit is rotatably arranged on the outside of the hub of the supporting shaft frame in a coaxial manner with the supporting shaft frame, and the positioning unit is connected to the driving unit in a meshing manner, and when the driving unit is acted upon by a force and rotates, the positioning unit is driven by the rotational energy of the driving unit to shift, so that several shifting components in the positioning unit shift equidistantly in a radial direction centered on the axis of the supporting shaft frame, wherein, when several moving components of the positioning unit move equidistantly in the radial direction and contact the end of a positioning object, the moving components are limited by the end of the positioning object so that the axis center of the axial hole of the supporting shaft frame coincides with the axis center of the positioning object.

[0011] The advantage of the present invention is that when an operator is operating, one person can complete the centering work. The operator moves the rack unit by rotating the transmission unit, so that the rack unit moves and contacts the inner diameter or outer diameter of the centering object, and the position of the centering unit is at the center. At this time, the trigger unit sends a trigger signal, indicating that the centering unit is already in the center position. The operator directly inserts the input shaft gear into the centering unit, and the center of the input shaft gear coincides with the center of the positioning ring of the centering object. The present invention can ensure accurate detection, especially ensure the consistency and stability of batch centering objects such as reducer performance detection.

[0012] Preferably, a positioning contact is provided at one end of the displacement component in the positioning unit that is capable of contacting the end of the positioning object. When the positioning contact contacts the end of the centering object based on the movement of the positioning unit, the contact surface of the positioning contact that contacts the centering object is deformed based on the interaction force, and at least one conductive component arranged on the contact surface is displaced based on the deformation of the contact surface and contacts the circuit associated with the signal generator in a manner that makes the circuit associated with the signal generator conductive, and the signal generator sends a trigger signal.

[0013] By setting the contact part of the positioning contact to deform to make the circuit conductive, a signal can be sent out in time based on the pressure on the positioning contact to remind the operator that the centering is completed, thereby avoiding the problem of the operator breaking or deforming the connecting rod due to excessive force. In addition, when all the positioning contacts send out signals, it means that each positioning contact is in contact with the end of the positioning object, and the support shaft frame must be in the center of the structure of the positioning tool. The signal sending setting is conducive to the operator to quickly determine whether each positioning contact is in contact with the end of the positioning object, thereby quickly determining whether the support shaft frame is in the center position of the positioning object.

[0014] Preferably, the driving unit includes a supporting ring gear and a thrust bearing which are sleeved on the outside of the hub of the supporting shaft frame, and the thrust bearing is coaxially arranged with the supporting ring gear and is arranged between the supporting ring gear and the wheel plate of the supporting shaft frame in a manner of bearing the axial load applied by the supporting ring gear, wherein a plurality of column gears distributed around the supporting ring gear are meshed with the supporting ring gear, and when one of the active column gears rotates based on the driving action of an external force, the supporting ring gear rotates based on the transmission force of the active column gear, and at the same time transmits the rotational energy to the driven column gear which is meshed with it and is not driven by an external force.

[0015] The present invention uses gear transmission to move the positioning unit, and the operator can adjust the rack movement to adjust the axis of the support shaft frame to coincide with the axis of the positioning object with one hand. The driving unit of the present invention has a simple structure and is easy to operate, so that the operator can complete the centering work alone.

[0016] Preferably, the moving assembly in the positioning unit at least includes a plurality of racks symmetrically arranged with the axis of the support shaft frame as the center, a plurality of connecting rods are arranged at one end of the racks and the axis of the connecting rods is perpendicular to the moving direction of the racks, and when the active column gear and / or the driven column gear rotate, the plurality of racks move radially along the support shaft frame based on the meshing driving action of the active column gear and / or the driven column gear and drive the connecting rods to move toward the end of the centering object. The equidistant movement of the racks of the present invention enables the support shaft frame to always be located at the center of each rack, and as long as the positioning contacts are in contact with the end of the positioning object, the axis of the support shaft frame coincides with the axis of the positioning object. The operator can leave one hand or even both hands to input the shaft gear, reducing the number of operators.

[0017] Preferably, the position of the rack in the positioning unit is defined by a corresponding slide rail, wherein the sliding direction of the slide rail is the radial direction of the support shaft frame and the slide rail is arranged at a position where the rack can mesh with the active column gear or the driven column gear. The advantages of setting the slide rail include: first, it can avoid deformation of the rack in the radial plane; second, it can reduce the movement resistance of the rack and shorten the time required for the centering process; third, it can limit the relative distance between the rack and the column gear to avoid the rack and the column gear from losing the meshing effect due to position deviation.

[0018] Preferably, a plurality of positioning contacts are arranged at the end of the connecting rod that is not in contact with the rack, and the positioning contacts at least include a spring contact that can be elastically displaced relative to the housing, a first positioning contact pin and a second positioning contact pin connected to the signal generator through a circuit, and when the spring contact contacts the end of the centering object and generates an action force, the spring contact approaches and contacts the first positioning contact pin and the second positioning contact pin based on the action force between the spring contact and the centering object, so that the circuit of the signal generator is turned on and a trigger signal is sent out. With such an arrangement, when the support shaft frame reaches the center position and the positioning contact sends out a signal, the operator can know in time that the centering is completed, which reduces the operator's operation time and avoids positioning errors caused by inaccurate or irregular positioning.

[0019] Preferably, the shell of the positioning contact is a hollow curved cavity, and a deformable component is provided in the contact range of the shell with the positioning object, the deformable component is arranged at the end of the spring contact, the shell is provided with a contact connecting frame for connecting to the connecting rod, and one end of the spring of the spring contact is fixed to the contact connecting frame through a spring fixing screw cover.

[0020] Preferably, the signal generator in the positioning contact is fixed on a contact connecting frame, and the signal generator is connected to a power source via a wire.

[0021] Preferably, the active column gear and / or the driven column gear are rotatably arranged on the support shaft frame, and the active column gear and / or the driven column gear are nearly perpendicular to the plane of the support shaft frame.

[0022] Preferably, at least two racks are symmetrically arranged on the same straight line, or four racks are arranged perpendicular to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a simplified schematic diagram of the module connection relationship of a centering tool according to a preferred embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the centering tool provided by the present invention being in a preparatory working state on the reducer;

[0025] Figure 3 It is a schematic diagram of the centering tool provided by the present invention working on the installation position of the reducer and the input shaft gear being centered;

[0026] Figure 4 is a schematic diagram of a rack in a non-working state in a centering tool provided by the present invention;

[0027] Figure 5 It is a schematic diagram of the rack in the centering tool provided by the present invention in the state of adjusting the measuring range;

[0028] Figure 6 It is a simplified structural schematic diagram of the distribution positions of multiple positioning contacts;

[0029] Figure 7 It is a cross-sectional view of the internal structure when the positioning contact is not in contact with the reducer;

[0030] Figure 8 It is a cross-sectional view of the internal structure when the positioning contact is in contact with the reducer;

[0031] Fig. 9 It is a simplified structural diagram of the input sleeve;

[0032] Fig.10 It is a simplified structural diagram of the input shaft gear.

[0033] Reference numerals list

[0034] 1: support shaft frame; 2: thrust bearing; 3: bearing; 4: bearing fixing nut; 5: support ring gear; 51: tooth rotation track; 6: driven column gear; 61: driving column gear; 7: column gear shaft; 8: slide rail; 9: rack; 10: connecting piece; 11: connecting rod; 12: positioning contact; 120: deformable component; 121: spring contact; 122: first positioning contact pin; 123: housing; 124: contact connecting frame; 125: spring fixing screw cover; 126: first wire; 127: signal generator; 128: screw; 129: power supply; 1210: second wire; 1211: second positioning contact pin; 13: handle; 14: positioning screw; 15: reducer; 16: installation position; 17: input shaft gear; 18: input shaft sleeve. DETAILED DESCRIPTION

[0035] The following is a detailed description with reference to the accompanying drawings.

[0036] The present invention provides a size-adjustable centering tool, and in particular provides a centering tool for detecting the performance of a robot reducer and a use method thereof.

[0037] The invention discloses a centering tool, such as Figures 1 to 10 As shown, it may include a support shaft frame, a driving unit and a positioning unit. The support shaft frame 1 is a wheel disc with a hub. The hub and the wheel disc are arranged in an integrated manner.

[0038] Preferably, the hub on the support shaft frame 1 protrudes on one side and does not protrude on the other side, so that the side of the support shaft frame 1 where the hub does not protrude can be close to and adjacent to the positioning object. Preferably, the support shaft frame 1 may or may not be in complete contact with the surface of the positioning object. More preferably, the support shaft frame 1 is in contact with the surface of the positioning object. Preferably, the wheel disc and the hub may be integrally formed, or may be arranged around the hub to form various distributions. The wheel disc may be a simple wheel disc without a hollow structure, or may be a wheel disc with a hollow structure.

[0039] An input sleeve 18 is provided on the axial inner side of the hub. Fig. 9 As shown, the input sleeve 18 is a cylindrical structure, and the size of the input sleeve 18 matches the inner diameter of the hub of the support shaft frame, so that the outer surface of the input sleeve 18 fits the inner surface of the hub. A protruding edge is provided at one end of the input sleeve 18, which is used to limit the axial position of the input sleeve 18, so that the input sleeve 18 is limited in position in the axial direction based on the obstruction of the edge and will not shift in the hub. Preferably, the edge of the input sleeve 18 is fixed to the protruding end of the hub by a connecting mechanical component. The connecting mechanical component is, for example, a bolt, a welding agent, a glue, etc.

[0040] Preferably, a driving unit is provided on the outside of the hub of the support shaft frame 1. More preferably, a driving unit is provided on the outer surface of the hub of the support shaft frame 1. The driving unit is connected to the positioning unit in a meshing manner. When the driving unit is driven by a force, the driving unit drives the gear component meshing with the positioning unit to rotate in a transmission manner in which a plurality of gears rotate, so that the positioning unit is driven and moves in a radial direction centered on the support shaft frame in the same plane when the gear component rotates. The signal unit is provided at the end of the rack in the positioning unit, and when the signal unit contacts the end of the centering object based on the movement of the positioning unit, the force between the signal unit and the centering object causes the circuit inside the signal unit to be turned on and send out a trigger signal.

[0041] The advantage of the present invention is that when an operator is operating, one person can complete the centering work. The operator drives the positioning unit to move radially and clamp the end of the positioning object from multiple angles by rotating the driving unit, so that the positioning unit moves and contacts the end of the centering object, and the position of the support shaft frame is at the center. After the positioning unit completes the positioning, the signal unit sends a trigger signal, indicating that the support shaft frame is already in the center position. The operator directly inserts the input shaft gear into the support shaft frame, and the center of the input shaft gear coincides with the center of the positioning ring of the centering object. When the center line of the support shaft frame 1 coincides with the center of the centering object, the input shaft gear 17 can be inserted into the input shaft sleeve 18 and installed at the center position of the centering object. The present invention can ensure accurate detection, especially ensure the consistency and stability of batch centering objects such as reducers.

[0042] like Figures 1 to 3 As shown, the drive unit includes a bearing 3, a thrust bearing 2, a plurality of column gears and a support ring gear 5. The support ring gear 5 is sleeved on the axial outer side of the support shaft frame 1 through the bearing 3, so that the support ring gear 5 can rotate relative to the support shaft frame 1 on the axial outer side. The bearing 3 is retained on the axial outer side of the hub by the bearing fixing nut 4. The radius of the support ring gear 5 is not greater than the radius of the support shaft frame, so that there is space on the radial outer side of the support shaft frame to install a plurality of column gears.

[0043] Preferably, the thrust bearing 2 is sleeved on the axial outer side of the support shaft frame 1 and coincides with the axial axis of the bearing 3. The thrust bearing 2 is arranged on the side of the bearing 3 facing the wheel disc of the support shaft frame 1 to support the axial load applied by the bearing 3. The thrust bearing 2 is arranged coaxially with the bearing 3 and is arranged between the support ring gear 5 and the wheel disc of the support shaft frame 1 in a manner of bearing the axial load applied by the support ring gear 5.

[0044] At least two driven column gears 6 are arranged at the edge of the support ring gear 5 in a manner of meshing with the support ring gear 5. The driven column gear 6 is rotatably arranged on the support shaft frame 1, and the driven column gear 6 is close to perpendicular to the plane where the ground of the support shaft frame 1 is located. For example, the driven column gear 6 is limited in position by a column gear shaft 7 arranged on the wheel disk of the support shaft frame. Preferably, the column gear shaft 7 is inserted into the wheel disk of the support shaft frame 1 for position positioning. The positioning method of the column gear shaft 7 is not limited, and can be welding, bolt connection or other mechanical connection methods. The axis of the column gear shaft 7 is parallel to the axis of the hub. The driven column gear 6 and the column gear shaft 7 are arranged in a manner of rotating around the column gear shaft 7, so that the driven column gear can rotate with the column gear shaft 7 as the axis. When the support ring gear 5 rotates, the driven column gear 6 rotates driven by the support ring gear 5, and transmits the transmission energy to the rack in the positioning unit meshed with it.

[0045] Among the plurality of driven column gears 6, the driven column gear 6 whose column is connected to the handle 13 is called the active column gear 61. The handle 13 and the column are connected by welding or bolts. When the handle 13 is rotated, the column of the active column gear 61 is driven by the handle 13 and rotates with the column gear shaft 7 as the axis, and the rotating active column gear 61 drives the supporting ring gear 5 to rotate. When the supporting ring gear 5 rotates, it drives the plurality of driven column gears 6 meshed with it to rotate.

[0046] Preferably, a positioning screw 14 is radially arranged on the column of the active column gear 61. The axial direction of the positioning screw 14 is perpendicular to the axial direction of the column gear shaft 7. When the positioning screw 14 is rotated, the positioning screw 14 contacts and relatively positions the column gear shaft 7, so that the column of the active column gear 61 stops rotating. Therefore, the positioning screw 14 has the function of locking the rotation of the active column gear 61, thereby stopping the rotation of the support ring gear 5 and the plurality of driven column gears 6. Preferably, a slot is arranged on the column gear shaft 7 at a position in contact with the positioning screw 14, so that the positioning screw 14 is stuck and positioned when in contact with the column gear shaft 7.

[0047] Alternatively, the handle 13 is fixedly connected to the adapter with a side spiral hole. The adapter with a side spiral hole is fixedly connected to the column of the active column gear 6. The positioning screw 14 is inserted into the adapter with a side spiral hole and can be screwed in and out of its inner hole. When the handle 13 is rotated to an appropriate position and needs to be stationary, the positioning screw 14 is screwed into the adapter with a side spiral hole and presses against the column gear shaft 7 so that the handle 13 cannot rotate and is locked.

[0048] Preferably, the plurality of driven column gears 6 and the driving column gear 61 are arranged in an axis-centered symmetric manner, which includes a line-symmetric manner and a center-symmetric manner.

[0049] Preferably, the radius size of the driven column gears 6 and the driving column gear 61 is the same, so that the rotation speed of the driven column gears 6 and the driving column gear 61 is the same. The driving unit of the present invention realizes the same speed rotation of each column gear through the meshing action of each gear of different sizes, which is conducive to the equal distance movement of each rack along each angle.

[0050] The driving unit in the present invention has a simple structure and is easy to operate, so that an operator can complete the radial movement of the positioning unit through gear transmission, and the operator can adjust the rack movement to adjust the support shaft frame to the center position with one hand. The driving centering work of the present invention reduces the number of operators.

[0051] Preferably, if Figures 1 to 10 As shown, the positioning unit at least includes a plurality of racks 9 arranged along the radial direction of the support shaft frame 1. The plurality of racks 9 are arranged at the same height in the axial direction, so that the plurality of racks move in the same radial plane. In the axial direction, the height of the rack 9 is lower than the height of the support ring gear 5, and is arranged in a manner not to contact the support shaft frame 1. The plurality of racks 9 are respectively meshed with at least one driven column gear 6 or driving column gear 61, so that the driven column gear 6 or the driving column gear 61 drives the rack 9 to reciprocate in the radial direction when rotating.

[0052] One end of the rack 9 is connected to a connecting rod 11 arranged in the axial direction. When the rack 9 moves in the radial direction of the support shaft frame 1 away from the axis, the connecting rod 11 moves away from the support shaft frame 1. When the rack 9 moves in the radial direction of the support shaft frame 1 toward the axis, the connecting rod 11 moves toward the support shaft frame 1.

[0053] In order to define the relative meshing position relationship between the rack 9 and the driven column gear 6 or the active column gear 61, the rack 9 is arranged in the slide rail 8. The sliding direction of the slide rail 8 is arranged along the radial direction of the support shaft frame 1, so that the rack 9 can mesh with the driven column gear 6 or the active column gear 61, and can slide along the radial direction of the support shaft frame 1 to reduce the sliding resistance of the rack 9. Preferably, one end of the slide rail 8 contacts the outside of the thrust bearing 2. Preferably, the slide rail 8 is positioned by welding or bolting.

[0054] Preferably, the slide rails 8 have the same axial height to maintain the rack 9 moving at the same axial height. When the driven column gear 6 or the active column gear 61 rotates at the same speed, the racks 9 move at equal distances at various angles, so that the connecting rods 11 move away from the support shaft frame at equal distances or move toward the support shaft frame at equal distances.

[0055] Preferably, the slide rails are radially distributed in the same radial plane with the hub of the support shaft frame 1 as the center. In the case of only two slide rails, the two slide rails are symmetrically arranged on the same straight line of the radial plane, so that the two racks move synchronously and symmetrically on a straight line. In the case of four slide rails, the four slide rails are radially distributed perpendicular to each other. That is, the four racks 9 are arranged perpendicular to each other to form a cross shape. The racks move synchronously at the same speed, for example, the racks move radially away from the hub at the same time, or the racks move radially close to the hub at the same time, so that the positioning contacts can contact the end of the centering object at the same time. Since the moving distance of each rack is the same, the support shaft frame 1 can only be limited to the center position of the centering object and coaxial with the centering object, thereby achieving the stability and accuracy of the centering.

[0056] The two racks 9 on the same straight line have two corresponding driven column gears 6 or driving column gears 61 that are centrally symmetrical with respect to the radial center of the support shaft frame 1. For example, the directions of the teeth of the two symmetrically arranged racks are opposite to each other in the radial plane. One column gear is on the left side of the first rack, and the other column gear meshed with the second rack symmetrically arranged is on the right side of the second rack. The two symmetrical racks 9 are moved or moved on the same straight line.

[0057] The number of slide rails and their gears in the present invention is not limited to two and four in the examples, but can be more. Among them, the number of slide rails and their gears is not limited to an even number, but can also be an odd number. For example, three slide rails are radially distributed at an angle of 120 degrees to each other. When the three racks are synchronously extended or contracted and synchronously contact the inner diameter or outer diameter of the centering object, the limiting effect of the rack can also limit the support shaft frame 1 to the center of the centering object, so that the center of the input shaft gear coincides with the centering object, such as the center of the locating ring of the reducer, to achieve the accuracy and stability of the centering.

[0058] The positioning unit of the present invention moves based on the rotation of the driving unit, and can clamp the outer diameter or inner diameter of the centering object, and move the support shaft frame to the center position in a rack-symmetrical manner, so that the sleeve of the support shaft frame coincides with the center of the centering object.

[0059] like Figure 4 and Figure 5 As shown, the dotted line trace is the rotation track 51 of the support ring gear 5. The tooth rotation track 51 of the support ring gear 5 is a circular track. Figure 4 When the centering tool is not in use, each rack 9 is retracted into the slide rail 8 under the drive of the driving unit to reduce the occupied space during storage and prevent the rack 9 and the connecting rod 11 from being touched and deformed. Figure 5As shown, when the centering tool is in the centering state, driven by the driving unit, each rack 9 extends out of the slide rail 8 and moves along the radial direction of the supporting shaft frame to contact and position the end of the positioning object at an appropriate position.

[0060] like Figure 2 and Figure 3 As shown, when several connecting rods 11 move and grasp the positioning object, the rack 9 cannot continue to move toward the axis, so that the driven column gear 6 and the active column gear 61 stop rotating, and the support ring gear 5 also stops rotating. Since the column of the active column gear 61 stops rotating, the rotation of the handle 13 encounters resistance. When the operator feels the operating resistance of the handle 13, he knows that the connecting rod 11 grasps the positioning object. At this time, the axis centerline of the support shaft frame 1 coincides with the axis centerline of the positioning object. Especially when the centering object is a reducer, the centering end of the reducer is a circular structure, and the connecting rod 11 grasps the mounting position 16 of the reducer, so that the axis centerline of the support shaft frame 1 coincides with the axis centerline of the positioning object.

[0061] However, the friction between the connecting rod 11 and the positioning object is relatively large, which makes the connecting rod 11 easily deformed, resulting in the connecting rod 11 being unable to accurately move the support shaft frame 1 to the axial position of the positioning object. In order to reduce the friction between the connecting rod 11 and the positioning object, and to send a signal in time when the connecting rod 11 contacts the installation position 16 of the positioning object, so as to avoid the operator from excessively turning the handle 13, avoiding the rack 9 from retracting too much and causing the connecting rod 11 to deform, the present invention is provided with a positioning contact 12.

[0062] Preferably, if Figures 1 to 10 As shown, the signal unit includes a plurality of positioning contacts 12 arranged at the free end of the connecting rod 11. The positioning contacts 12 are spherical in overall appearance to reduce the contact area with the positioning object, thereby reducing the movement resistance of the positioning contacts.

[0063] Preferably, if Figures 6 to 8 As shown, the positioning contact 12 at least includes a deformable component 120 capable of elastic displacement relative to a housing 123, a spring contact 121, and a first positioning contact pin 122 and a second positioning contact pin 1211 connected to a signal generator 127 through a circuit. When the spring contact 121 contacts the end of the centering object and generates a force, the spring contact 121 approaches and contacts the first positioning contact pin 122 and the second positioning contact pin 1211 based on the force between the spring contact 121 and the centering object, so that the circuit of the signal generator 127 is turned on and a trigger signal is sent out.

[0064] Specifically, Figure 4As shown, the housing 123 of the positioning contact 12 is a hollow curved cavity. The shape of the housing is preferably spherical. For example, a spherical or ellipsoidal shape. The housing 123 is provided with a contact connecting frame 124 for connecting to the connecting rod 11. The contact connecting frame is in the shape of a hollow column, and the contact connecting frame is axially divided into two sub-cavities by a partition inside. The first sub-cavity that passes through the housing is used to fix the spring contact 121, the positioning contact pin and the signal generator. The second sub-cavity is used to accommodate the power supply 129, and is used to be threadedly connected to the screw to achieve a fixing effect. The partition is provided with a hole through which the second wire 1210 connected to the power supply passes, so as to achieve the conduction of the circuit.

[0065] The contact connection frame 124 is fixed inside the housing by screws 128. The contact connection frame 124 is preferably arranged at the center of the housing cavity, and both ends of the contact connection frame 124 are in contact with the housing respectively. The contact connection frame 124 is arranged through the housing so that the housing has a hole allowing the connecting rod to be inserted into the contact connection frame.

[0066] The spring contact 121 is connected to the deformable component 120. The deformable component 120 is made of a material that can recover its deformation. For example, the deformable component 120 is made of a resin film, such as PVDF polyvinylidene fluoride. The curved surface of the deformable component 120 is a part of the radian curved surface of the housing 123 of the positioning contact 12. One end of the spring of the spring contact 121 is fixed to the contact connecting frame 124 through the spring fixing cover 125. Among them, one end of the spring is fixed to the spring fixing cover 125. The spring fixing cover 125 is fixed to the contact connecting frame 124. The advantage of setting the spring contact as a curved surface structure is that the curved surface structure can contact the inner diameter or outer diameter of the centering object in advance, so that the curved surface structure can move with the radial movement of the rack. When the spring contact contacts the outer diameter and continues to move, the deformable component compresses the spring and approaches the first positioning contact pin 122 and the second positioning contact pin 1211.

[0067] The first positioning contact pin 122 and the second positioning contact pin 1211 are fixed on the spring fixing cover 125 in parallel, and the axes of the first positioning contact pin 122 and the second positioning contact pin 1211 are parallel to the axis of the spring. The first positioning contact pin 122 and the second positioning contact pin 1211 are metal pins. The first positioning contact pin 122 is electrically connected to the signal generator 127 through the first wire 126. The second positioning contact pin 1211 is electrically connected to the signal generator 127 through the second wire 1210.

[0068] like Figure 6 As shown, each positioning contact 12 is arranged in the direction of the deformable component 120 toward the axis of the supporting shaft frame 1, which is conducive to the deformable component 120 of the positioning contact 12 contacting the positioning part of the positioning object.

[0069] Preferably, the signal generator 127 in the positioning contact 12 is fixed on the contact connecting frame 124. The signal generator 127 is connected to the power supply 129 through a wire. The signal generator 127 in the present invention is an electronic device that can send a signal. The trigger signal can be a light signal, an acoustic signal or an electrical signal, or a color change signal. The signal generator 127 is, for example, a lamp, a player that can send a sound, a device that changes color when powered on, etc., and is not limited to the types of the current examples.

[0070] like Figure 7 As shown, when the positioning contact does not contact the positioning portion 16, the deformable component 120 does not deform, and the spring contact 121 is not subjected to force. The spring contact 121 does not contact the first positioning contact pin 122 and the second positioning contact pin 1211 respectively and is spaced a certain distance apart.

[0071] like Figure 8 As shown, when the positioning contact contacts the positioning portion 16, the deformable component 120 is deformed and the spring contact 121 is stressed. The deformable component 120 compresses the spring and approaches the first positioning contact pin 122 and the second positioning contact pin 1211 until the deformable component 120 contacts the first positioning contact pin 122 and the second positioning contact pin 1211 respectively. At this time, the first positioning contact pin 122, the second positioning contact pin 1211, the power supply and the deformable component 120 form a conductive circuit, so that the signal generator is powered on and sends a trigger signal.

[0072] With such arrangement, the signal generator sends a signal when the support shaft frame reaches the center position, and the operator can know in time that the centering is completed, thereby reducing the operator's operation time and avoiding positioning errors caused by inaccurate or irregular positioning, and avoiding deformation of the connecting rod 11 due to excessive displacement of the rack 9.

[0073] Preferably, the connecting rod 11 can also be connected to the rack 9 through a connecting piece, so that the connecting rod, the positioning contact and the rack are in the same straight line. In this case, the spring contact of the positioning contact needs to be arranged at the end of the housing, rather than the side portion. When the centering tool is used on the centering object of the internal cavity, it can also be used for centering.

[0074] Taking the reducer as the centering object, the method of using the centering tool of the present invention is as follows.

[0075] like Figure 5 As shown, the mounting position 16 on the reducer 15 protrudes from the surface. The outer diameter design size of the reducer locating ring is known. The centering tool is placed on the mounting position 16, and the reducer locating ring is centered by adjusting the position of the rack and the locating contact 12.

[0076] In the first case, determine the size first and then position. After placing the centering tool in the installation position, directly turn the handle 13 on the driven column gear 6 to make the column gear shaft 7 drive the driven column gear 6 to rotate. The driven column gear 6 drives the support ring gear 5 to rotate. The support ring gear 5 then drives the other column gears to rotate. The driven column gear 6 drives the meshing rack 9 to move. The rack 9 is vertically connected to the connecting piece 10 by screws. The connecting piece 10 is spirally connected to the positioning contact 12. When the spring contact 121 is in contact with the first positioning pin 122 and the second positioning pin 1211 at the same time, measure the distance between the two relative positioning contacts 12, which is equal to the design size of the outer diameter of the reducer positioning ring. Tighten the positioning screw 14. The center position of the input shaft sleeve 18 on the support shaft frame 1 can be determined by directly bringing the four positioning contacts of the centering tool into contact with the outer diameter of the reducer positioning ring. As shown in Figure 3 As shown, the input shaft gear 17 is directly inserted into the input shaft sleeve 18. At this time, the center of the input shaft gear coincides with the center of the reducer positioning ring, ensuring accurate detection, especially ensuring the consistency and stability of batch reducer detection.

[0077] The second case is positioning after undetermined size. Adjust the position of the positioning contact of the centering tool directly according to the approximate size of the outer diameter of the reducer positioning ring, and then fine-tune the position of the positioning contact through the handle 13. When the four positioning contacts light up at the same time, it indicates that the center of the centering tool coincides with the center of the reducer positioning ring. At this time, tighten the positioning screw 14 of the positioning device. Directly insert the input shaft gear 17 into the input shaft sleeve 18. At this time, the center of the input shaft gear coincides with the center of the reducer positioning ring, ensuring accurate detection, especially ensuring the consistency and stability of batch reducer detection.

[0078] After the installation of the reducer input shaft gear is completed, the detection instrument mechanical arm claw extends down to clamp and lift the precision reducer input shaft gear, rotates the handle 13 of the centering tool in the opposite direction to separate the positioning contact of the positioning tool from the reducer, and removes the centering tool. The detection instrument mechanical arm claw drives the precision reducer input shaft gear to extend down again and insert it into the precision reducer for detection.

[0079] It should be noted that the above-mentioned specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also belong to the disclosure scope of the present invention and fall within the protection scope of the present invention. Those skilled in the art should understand that the present invention specification and its drawings are illustrative and do not constitute a limitation on the claims. The scope of protection of the present invention is defined by the claims and their equivalents. The present invention specification contains multiple inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", all of which indicate that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to file a divisional application based on each inventive concept.

Claims

1. A size-adjustable centering tool, characterized in that: At least: Support shaft frame (1), drive unit and positioning unit, The drive unit is rotatably arranged on the outside of the hub of the support shaft frame (1) coaxially with the support shaft frame (1); an input shaft sleeve (18) is arranged on the axial inner side of the hub; one end of the input shaft sleeve (18) is provided with a protruding edge portion for limiting the axial position of the input shaft sleeve (18), so that the input shaft sleeve (18) is limited in position in the axial direction based on the obstruction of the edge portion and will not shift in the hub; the positioning unit is connected to the drive unit in a meshing manner, When the driving unit is acted upon by a force and rotates, the positioning unit is driven by the rotational energy of the driving unit to shift, so that a plurality of moving components in the positioning unit shift at equal distances in a radial direction centered on the axis of the supporting shaft frame (1). Wherein, when several moving components of the positioning unit move at equal distances in the radial direction and contact the end of the centering object, the moving components are limited by the end of the centering object so that the axis of the shaft hole of the support shaft frame (1) coincides with the axis of the centering object. When the center line of the support shaft frame (1) coincides with the center of the centering object, the input shaft gear (17) can be inserted into the input shaft sleeve (18) and installed at the center position of the centering object. The moving assembly in the positioning unit at least comprises a plurality of racks (9) symmetrically arranged with the axis of the supporting shaft frame (1) as the center, a plurality of connecting rods (11) arranged at one end of the racks (9) and the axis of the connecting rods (11) is perpendicular to the moving direction of the racks (9), and a plurality of positioning contacts (12) are arranged at the free ends of the connecting rods (11), and the centering tool can be used in the centering process of the centering object of the internal cavity. The drive unit comprises a support ring gear (5) and a thrust bearing (2) which are sleeved on the outside of the hub of the support shaft frame (1) through a bearing (3); the bearing (3) is retained on the axial outer side of the hub through a bearing fixing nut (4); the thrust bearing (2) is sleeved on the axial outer side of the support shaft frame (1) and coincides with the axis of the bearing (3); the thrust bearing (2) is arranged on the side of the bearing (3) facing the wheel disc of the support shaft frame (1) to support the axial load applied by the bearing (3); the thrust bearing (2) is coaxially arranged with the support ring gear (5) and is arranged between the support ring gear (5) and the wheel disc of the support shaft frame (1) in a manner of bearing the axial load applied by the support ring gear (5); A plurality of positioning contacts (12) are arranged at an end of the connecting rod (11) that is not in contact with the rack (9), the positioning contacts (12) comprising at least a spring contact (121) capable of elastic displacement relative to a housing (123), a first positioning contact pin (122) and a second positioning contact pin (1211) connected to a signal generator (127) via a circuit, When the spring contact (121) contacts the end of the centering object and generates a force, the spring contact (121) approaches and contacts the first positioning contact pin (122) and the second positioning contact pin (1211) based on the force between the spring contact (121) and the centering object, so that the circuit of the signal generator (127) is turned on and a trigger signal is emitted.

2. The centering tool according to claim 1, characterized in that When the positioning contact (12) contacts the end of the centering object based on the movement of the positioning unit, the contact surface of the positioning contact (12) in contact with the centering object is deformed based on the interaction force, and at least one conductive component arranged on the contact surface is displaced based on the deformation of the contact surface and contacts the circuit associated with the signal generator (127) so that the circuit associated with the signal generator (127) is turned on, and the signal generator (127) sends a trigger signal.

3. The centering tool according to claim 2, characterized in that A plurality of column gears distributed around the support ring gear (5) mesh with the support ring gear (5). When one of the active column gears (61) rotates due to external driving force, the support ring gear (5) rotates based on the transmission force of the active column gear (61) and simultaneously transmits the rotational energy to the driven column gear (6) meshed with it and not driven by external force.

4. The centering tool according to claim 3, characterized in that When the active column gear (61) and / or the driven column gear (6) rotate, the plurality of racks (9) move radially along the support shaft frame (1) based on the meshing driving action of the active column gear (61) and / or the driven column gear (6) and drive the connecting rod (11) to move toward the end of the centering object.

5. The centering tool according to claim 4, characterized in that The position of the rack (9) in the positioning unit is defined by a corresponding slide rail (8), wherein the sliding direction of the slide rail (8) is the radial direction of the support shaft frame (1), and the slide rail (8) is arranged at a position where the rack (9) can mesh with the active column gear (61) or the driven column gear (6).

6. The centering tool according to claim 2, characterized in that The housing (123) of the positioning contact (12) is a hollow curved cavity, and a deformable component (120) is provided in the contact range between the housing (123) and the centering object, wherein the deformable component (120) is provided at the end of the spring contact (121). The housing (123) is provided with a contact connection frame (124) for connecting to the connection rod (11). One end of the spring of the spring contact (121) is fixed to the contact connection frame (124) via a spring fixing screw cap (125).

7. The centering tool according to claim 6, characterized in that The curved surface of the deformable component (120) is a part of the radian curved surface of the housing (123) of the positioning contact (12).

8. The centering tool according to claim 7, characterized in that The signal generator (127) in the positioning contact (12) is fixed on the contact connection frame (124). The signal generator (127) is connected to the power source (129) via a wire.

9. The centering tool according to claim 3, characterized in that The driving column gear (61) and / or the driven column gear (6) are rotatably arranged on the support shaft frame (1). Furthermore, the driving column gear (61) and / or the driven column gear (6) are approximately perpendicular to the plane of the supporting shaft frame (1).

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