CN211890810U - Dotting positioning mechanism for drilling of stator of water turbine - Google Patents
Dotting positioning mechanism for drilling of stator of water turbine Download PDFInfo
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- CN211890810U CN211890810U CN202020145384.7U CN202020145384U CN211890810U CN 211890810 U CN211890810 U CN 211890810U CN 202020145384 U CN202020145384 U CN 202020145384U CN 211890810 U CN211890810 U CN 211890810U
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Abstract
The utility model discloses a dotting positioning mechanism for drilling a stator of a water turbine, which comprises a base, a loading platform which is rotatably arranged on the base, and an ejector pin fixing mechanism which is arranged above the loading platform and is provided with a dotting ejector pin, wherein a positioning clamping device is arranged on the loading platform, a driving mechanism for driving the loading platform to rotate is arranged on the base, the thimble fixing mechanism comprises a horizontal moving mechanism and a vertical lifting rod, the dotting thimble is axially movably arranged at the lower end of the vertical lifting rod, a pressure element which is pressed against the striking point thimble is arranged on the vertical lifting rod, the upper end of the vertical lifting rod can move from an initial position to a striking point position on the horizontal moving mechanism, when the vertical lifting rod is located at the initial position, the center of the dotting thimble is located on the rotating axis of the loading platform, and the horizontal moving track of the vertical lifting rod is located in the radial direction of the loading platform. The utility model discloses can show ground promotion work efficiency, reduce the processing cost to promote the precision of dotting effectively.
Description
Technical Field
The utility model relates to a hydraulic turbine group makes technical field, concretely relates to drilling of hydraulic turbine stator is used beats a positioning mechanism.
Background
With the enhancement of energy conservation and environmental protection consciousness of people, hydroelectric power generation as a green energy source is being vigorously developed, and in the field of hydroelectric power generation, a water turbine set is a key part and generally comprises a stator and a rotor rotatably arranged in the stator, wherein a plurality of magnetic pole coils are arranged on the edge of the rotor, and when water flow formed by water level difference of a reservoir drives the rotor to rotate, electric energy can be generated. For large hydro-turbines, a vertical configuration is generally used, i.e. wherein the axes of the stator and rotor are arranged vertically. In order to realize the assembly of the stator, a plurality of feed-through screw holes are processed on the stator, and the centers of all the screw holes are positioned on the same circle which is coaxial with the axis of the stator. It is known that a drill for drilling holes can only bear axial acting force, but not lateral acting force, unlike a milling cutter for milling machines, and therefore, when a workpiece is drilled on a surface, a conical point position, commonly called a dotting point, needs to be pressed out by a conical dotting thimble at the center of a hole position. When drilling is started, the drill bit is aligned to the conical point position, then the drill bit is moved downwards in the axial direction, and the tip end of the drill bit can be positioned in the conical point position, so that the central position of the hole position to be machined can be accurately positioned, and deviation of the hole position and inclination of the axis of the machined hole due to lateral sliding of the drill bit during drilling can be avoided.
In the prior art, a workpiece needing drilling is usually dotted by adopting the following method, for a small single-piece machined part, a height caliper for marking can be used by a bench worker to draw X, Y crisscross lines in two directions at the position where the workpiece needs drilling and represents the position needing drilling, then an iron hammer is used for knocking a dotted thimble, and a conical point position is punched at the cross point of the crisscross lines; for larger or batch processed parts, the parts can be placed on a working table of a numerical control machining center, then the dotting thimble is fixed on a main shaft of the machining center, the accurate position of a hole position to be machined can be quickly and conveniently positioned, the main shaft is moved downwards along the axial direction according to the calculated coordinate of the hole position in the Z-axis direction, and the dotting thimble is enabled to punch a conical point position on the surface of a workpiece.
Although this method has the advantages of high speed, high efficiency and high position accuracy, when used for dotting the stator of the large hydraulic turbine set, the following problems exist: firstly, the stator of a large hydraulic turbine set has large overall dimension and heavy weight, and is difficult to put on the existing numerical control machining center for dotting, or if an ultra-large machining center is adopted for simple dotting operation, the cost is greatly increased, and the popularization is difficult. Therefore, in many times, people still use a ruler to perform dotting in a pure manual mode such as measuring and marking on a workpiece, so that the efficiency is seriously influenced; secondly, the NC machining center is precisely positioned by controlling the movement of the main shaft in X, Y directions, that is, the machining center adopts a rectangular coordinate system, the center of the required machining hole is determined according to the X, Y coordinate value, and a plurality of screw holes on the stator are distributed circumferentially around the axis of the stator, that is, the preferred coordinate system is a polar coordinate system comprising a radius and an angle. Therefore, when we determine the hole location on the numerical control machining center, we need to calculate the X, Y coordinate value of the hole location by the trigonometric function formula, which causes the complexity of the program and is easy to generate large errors. In particular, screw holes to be machined in the stator are not located on the same machining surface, and heights of the screw holes are different, so that when a numerical control machining center performs dotting, different Z-axis coordinates of a main shaft need to be set according to heights of different hole positions, and programming trouble is caused. In particular, for a stator blank which is not finished with machining, the height of the surface of the stator blank is not determined, so that the stator finished with surface machining still has a large error in the height of the surface of a drilled hole due to large size during machining and assembling, and the depth of a conical point formed by dotting is extremely small, so that the error can cause the depth of the finally formed point to be too deep or too shallow, thereby seriously affecting the dotting quality and affecting the quality of subsequent drilling.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that the method of dotting before the drilling of current hydraulic turbine stator exists inefficiency, with high costs, the precision is poor, provide a positioning mechanism is dotted of drilling of hydraulic turbine stator usefulness, can show ground promotion work efficiency, reduce the processing cost to promote the precision of dotting effectively.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a dotting positioning mechanism for drilling a stator of a water turbine comprises a base, a loading platform, a thimble fixing mechanism and a dotting thimble, wherein the loading platform is rotatably arranged on the base, the thimble fixing mechanism is arranged above the loading platform, the dotting thimble is arranged on the thimble fixing mechanism, a positioning and clamping device for clamping the stator is arranged on the loading platform, a driving mechanism for driving the loading platform to rotate in a horizontal plane is arranged on the base, the thimble fixing mechanism comprises a horizontal moving mechanism and a vertical lifting rod, the dotting thimble is axially movably arranged at the lower end of the vertical lifting rod, a pressure element for pressing the dotting thimble is arranged on the vertical lifting rod, the upper end of the vertical lifting rod is transversely movably connected to the horizontal moving mechanism, so that the vertical lifting rod can move from an initial position to a dotting position on the horizontal moving mechanism, when the vertical lifting rod is positioned at the initial position, the center of the dotting thimble is positioned on the rotating axis of the loading platform, and the horizontal moving track of the vertical lifting rod is positioned in the radial direction of the loading platform.
As mentioned above, the screw hole to be machined is located on a circle coaxial with the center of the stator, and particularly, the stator has a circular structure, so that the hole to be machined is more suitable for marking the hole position by polar coordinates. Because the utility model discloses a rotatable loading platform need beat for the stator when pointing, can hoist the loading platform with the stator earlier to make the stator reliably fix a position at initial position and firm centre gripping on loading platform through location clamping device, in order to avoid it to produce the aversion, at this moment, the center of the thimble of hitting of vertical lifter lower extreme is located loading platform's rotation center. Therefore, the diameter of the hole to be machined in the polar coordinates is the distance between the hole and the rotation center of the loading platform, and the polar angle is the angle of the hole rotated relative to the rotation center of the loading platform. Therefore, the loading platform can drive the stator to rotate by an angle equal to the polar angle through the driving mechanism, and then the vertical lifting rod horizontally moves by a distance equal to the polar diameter to the dotting position; and then, the dotting thimble at the lower end of the vertical lifting rod moves downwards, so that a conical point position corresponding to the first hole position can be punched on the stator. When the second hole site needs to be dotted, the second hole site can be conveniently dotted only by rotating the loading platform for an angle. Of course, the holes with centers not on the same circle can be punched, and at the moment, after the loading platform rotates for an angle, the position of the vertical lifting rod only needs to be moved again.
Preferably, a stepped hole with a small opening and a large inside is formed in the lower end of the vertical lifting rod, the dotting thimble is matched in the small hole of the stepped hole, a limiting disc located in the large hole is arranged at the inner end of the dotting thimble, and the pressure element is a pressure spring arranged in the large hole and abutted against the limiting disc.
The pressure spring can form an initial pressure on the limiting disc, and when the heights of all point positions are inconsistent during dotting of the stator, the downward moving position of the dotting thimble can be determined according to the lowest height of the point positions and the extrusion allowance. When the dotting is needed, the vertical lifting rod enables the dotting thimble to move downwards, the tip of the dotting thimble is abutted to the surface of the stator, the surface of the stator can reversely extrude the dotting thimble, so that the dotting thimble overcomes the elastic force of the pressure spring to move upwards, the situation that the downwards moving position and size of the dotting thimble are re-determined for each point position with different heights can be avoided, the elastic force formed by the pressure spring can enable each point position to have proper depth, and subsequent drilling is facilitated.
It can be understood that the pressure spring with the initial pretightening force can enable the dotting thimble to form basically consistent pressure on the surface of the stator, so that a point with approximate depth is punched. In addition, when we need to dotte the stator blank with an unprocessed surface, the actual height dimension of each point position is uncertain, so that it is difficult to accurately set the downward moving distance and dimension of the dotting thimble through a calculation mode, and the elastically connected dotting thimble can effectively solve the technical problem and ensure the successful dotting operation.
Preferably, the pressure element comprises a main oil cylinder arranged at the lower end of the vertical lifting rod and auxiliary oil cylinders connected side by side to the side of the main oil cylinder, the dotting thimble is arranged at the end part of a piston rod extending downwards from the main oil cylinder, the upper part of the main oil cylinder is a main working cavity provided with hydraulic oil, an auxiliary piston which can be arranged in the auxiliary oil cylinder in an up-and-down lifting mode separates the auxiliary working cavity at the lower part of the auxiliary oil cylinder, a balancing weight is arranged on the upper side of the auxiliary piston, and the main working cavity and the auxiliary working cavity are communicated through a pipeline.
In the scheme, the pressure of the dotting thimble comes from the main oil cylinder. The pressure of the main working chamber on the upper side of the main oil cylinder is generated by the auxiliary oil cylinder, and the hydraulic oil pressure of the auxiliary oil cylinder is determined by the weight of the counterweight block on the auxiliary piston. That is to say, the hydraulic oil pressure of the main oil cylinder equal to the hydraulic oil pressure of the auxiliary oil cylinder is fixed, so that the main oil cylinder can form a constant pressure on the dotting thimble, the dotting point position is ensured to have consistent depth and size, and the dotting quality is ensured to meet the design requirement. Particularly, the pressure of the dotting thimble on the surface of the stator can be conveniently adjusted by adjusting the weight of the balancing weight, so that the dotting device is suitable for the dotting work of stators made of different materials and with different surface hardness.
Preferably, the cross-sectional area of the primary working chamber is 2 to 4 times the cross-sectional area of the secondary working chamber.
When the dotting thimble is abutted by the surface of the stator and the dotting thimble is moved upwards, the main working cavity is gradually reduced, and correspondingly, the auxiliary working cavity is gradually increased. Because the cross section of the auxiliary working cavity is smaller than that of the main working cavity, and the pressure of hydraulic oil in the auxiliary working cavity is the same as that of hydraulic oil in the main working cavity, a smaller auxiliary oil cylinder can be arranged, and enough pressure can be generated, so that the main oil cylinder can generate enough pressure on the dotting thimble. That is to say, through the pressure amplification relation between the auxiliary oil cylinder and the main oil cylinder, on the premise of ensuring that the dotting thimble can form enough pressure on the surface of the stator, the volume of the auxiliary oil cylinder can be obviously reduced, and the overall dimension and the weight of the balancing weight are reduced.
Preferably, the horizontal movement mechanism comprises a horizontal guide rail, the upper end of the vertical lifting rod is movably arranged on the horizontal guide rail, a limiting block is movably arranged on the horizontal guide rail and positioned outside the vertical lifting rod far away from the initial position, and a horizontal movement scale is arranged on the moving guide rail.
When dotting is needed, the limiting block can be moved to the horizontal movement scale position corresponding to the pole diameter and fixed according to the coordinate of the pole diameter of the point position to be dotted, then the vertical lifting rod is moved outwards until the vertical lifting rod is attached to the limiting block, and then the loading platform is rotated, so that the dotting thimble can be quickly and accurately positioned at the coordinate of the point position, the dotting precision is ensured, the dotting procedure is simplified, and the dotting efficiency is improved.
Preferably, the loading platform is provided with a rotation angle scale on the edge, and the base is provided with a reference angle scale.
The rotation angle of the loading platform can be conveniently obtained by comparing the rotation angle scale with the reference angle scale. It can be understood that for the stator of the large-scale hydraulic turbine set with the diameter exceeding 9 meters, the circumference of the loading platform is close to 30 meters, and accordingly, the precision of the scale of the rotation angle of the edge of the loading platform can be set to the degree or even be divided into the precision grade, so that the position of the dotting thimble is accurately positioned, and the precision of the hole position after drilling is ensured.
Preferably, a rotating shaft rotatably connected with the base is vertically arranged at the center of the loading platform, a reduction gear is arranged on the rotating shaft, the driving mechanism comprises a reduction gear set, the output end of the reduction gear set is in transmission connection with the reduction gear, the input end of the reduction gear set is in transmission connection with the driving handle, the reduction ratio between the driving handle and the rotating shaft is N: 1, and N is an integer between 4 and 10.
Through the speed reduction of the reduction gear set, on one hand, labor saving of the driving handle is facilitated, on the other hand, if the loading platform needs to rotate by a small angle such as 0.5 degrees, the angle of rotation of the driving handle is 0.5N, and N is an integer between 4 and 10, so that the angle of rotation of the driving handle is between 2 and 5 degrees, and accurate control of the angle of rotation of the loading platform is facilitated.
Therefore, the utility model discloses following beneficial effect has: the working efficiency can be obviously improved, the processing cost is reduced, and the dotting precision is effectively improved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of a connection structure of the dotting thimble and the vertical lifting rod.
FIG. 3 is a schematic view of another connection structure of the dotting thimble and the vertical lifting rod.
Fig. 4 is a schematic view of a structure of the driving mechanism.
In the figure: 1. the device comprises a base 2, a loading platform 21, a rotating shaft 22, a reduction gear 23, a reduction gear set 24, a driving handle 3, a dotting thimble 31, a limiting disc 4, a vertical lifting rod 41, a limiting nut 42, a stepped hole 43, a pressure spring 5, an air main oil cylinder 51, a main working cavity 6, an auxiliary oil cylinder 61, an auxiliary working cavity 62, an auxiliary piston 63, a balancing weight 7, a horizontal moving mechanism 71, a support 72, a horizontal guide rail 73 and a limiting block.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description.
As shown in figure 1, the dotting positioning mechanism for drilling the stator of the water turbine is suitable for dotting the screw hole on the stator in advance when the screw hole is machined. The loading platform comprises a base 1, a circular loading platform 2, a thimble fixing mechanism and a dotting thimble 3, wherein the circular loading platform 2 is rotatably arranged on the base, the thimble fixing mechanism is arranged above the loading platform, the dotting thimble 3 is arranged on the thimble fixing mechanism, a rotating shaft of the loading platform is vertically arranged, the upper surface of the loading platform is a horizontal bearing surface, and when the loading platform rotates on the base, the bearing surface can rotate in the horizontal plane. In addition, a positioning and clamping device (not shown) for clamping the stator is arranged on the loading platform, and a driving mechanism for driving the loading platform to rotate in a horizontal plane is arranged on the base, so that the stator placed on the loading platform can be reliably positioned and clamped, and the driving mechanism drives the stator to rotate through a required angle by the platform.
In addition, the thimble fixing mechanism comprises a horizontal moving mechanism 7 and a vertical lifting rod 4, the dotting thimble is axially movably arranged at the lower end of the vertical lifting rod, and a pressure element for abutting against the dotting thimble is arranged on the vertical lifting rod, so that an initial pre-tightening force is formed on the dotting thimble. The upper end of the vertical lifting rod is connected on the horizontal moving mechanism in a transversely movable mode, so that the vertical lifting rod can move from the initial position to the dotting position on the horizontal moving mechanism. When the vertical lifting rod is located at the initial position, the center of the dotting thimble is located on the rotating axis of the loading platform, and the horizontal moving track of the vertical lifting rod is located in the radial direction of the loading platform.
It should be noted that the utility model discloses a position in the screw rod hole that the required processing of polar coordinate mark. As is known, polar coordinates have two coordinate parameters, a polar diameter and a polar angle, and polar coordinates have an angle starting reference that determines the origin of the polar diameter and the polar angle. We can locate the origin of the polar coordinates at the centre of the stator and the angular start reference in the radial direction across the centre of one of the holes in the stator and locate a corresponding reference point on the base. When the stator needs to be dotted, the stator can be hoisted to the loading platform firstly, the stator is reliably positioned at the initial position on the loading platform and is firmly clamped through the positioning and clamping device, so that the displacement of the stator is avoided, at the moment, the center of the stator is superposed with the rotation center of the loading platform, and the angle initial reference on the stator corresponds to the reference point on the base. That is, the center of the dotting thimble at the lower end of the vertical lifting rod is located at the center of the stator, i.e., at the origin of the polar coordinates.
In the case where the hole sites of all the screw holes are located on the same circle, that is, the diameters of the hole sites are equal. The loading platform can drive the stator to rotate by an angle equal to the polar angle of the hole site through the driving mechanism, and then the vertical lifting rod horizontally moves to a dotting position by a distance equal to the polar diameter of the hole site; and then, the dotting thimble at the lower end of the vertical lifting rod moves downwards, so that conical point positions corresponding to the hole positions can be punched on the stator. When the other hole site needs to be punched, the other hole site can be punched conveniently only by rotating the loading platform for an angle. Of course, we can also hit several holes whose centers are not on the same circle, and at this time, after the loading platform is rotated by an angle, only the position of the vertical lifting rod needs to be moved again.
It should be noted that, as shown in fig. 2, the vertical lifting rod may be an air cylinder, and the striking pin is disposed at an end of a piston rod extending downward from the cylinder body of the air cylinder, so as to conveniently control the lifting of the striking pin. Preferably, the upper end of the piston rod of the cylinder can extend out of the cylinder body upwards, and the piston rod at the upper section is in threaded connection with two limit nuts 41, wherein the limit nut at the lower side is used for limiting the distance of the piston rod moving downwards, and the limit nut at the upper side can enable the limit nut at the lower side to realize self-locking, so that the limit nut at the lower side is prevented from automatically rotating and shifting, and the accuracy and reliability of the downward moving distance of the dotting thimble are ensured.
As a preferred scheme, a stepped hole 42 with a small opening and a large opening is formed in the lower end of the vertical lifting rod, the dotting thimble is a cylinder which is matched in the small hole of the stepped hole, the lower end of the dotting thimble is a conical hard alloy tip, a limiting disc 31 which is positioned in the large hole is arranged at the inner end of the dotting thimble which is positioned in the stepped hole, and the pressure element is a pressure spring 43 which is arranged in the large hole and presses against the limiting disc, so that the limiting disc of the dotting thimble is limited at the step of the large hole and the small hole.
The pressure spring forms an initial pressure on the limiting disc, when the rotor is dotted, when the heights of all point positions are inconsistent, the downward moving position of the dotting thimble can be determined according to the lowest height of the point positions and the extrusion allowance. When the point positions with higher heights need to be punched, the surface of the stator can extrude the punching thimble, so that the punching thimble moves upwards against the elastic force of the pressure spring, the downward moving position and the downward moving size of the punching thimble are prevented from being determined for each point position, each point position is ensured to have proper depth, and subsequent drilling is facilitated.
It can be understood that the pressure spring with the initial pretightening force can enable the dotting thimble to form basically consistent pressure on the surface of the stator, so that a point with approximate depth is punched. In addition, when we need to dotte the stator blank with an unprocessed surface, the actual height dimension of each point position is uncertain, so that it is difficult to set the downward moving distance and dimension of the dotting thimble by a calculation mode, and the elastically connected dotting thimble can effectively solve the technical problem and ensure the successful dotting operation.
As another preferred scheme, as shown in fig. 3, the pressure element comprises a main cylinder 5 arranged at the lower end of the vertical lifting rod, and auxiliary cylinders 6 connected side by side to the main cylinder, the dotting thimble is arranged at the end of the piston rod extending downwards from the main cylinder, the piston of the main cylinder divides a main working chamber 51 provided with hydraulic oil at the upper part of the main cylinder, an auxiliary piston 62 arranged in the auxiliary cylinder in a way of lifting upwards and downwards divides an auxiliary working chamber 61 at the lower part of the auxiliary cylinder, a counterweight 63 is arranged at the upper side of the auxiliary piston, and the main working chamber and the auxiliary working chamber are communicated through a pipeline.
In the scheme, the pressure of the dotting thimble comes from the main oil cylinder. The pressure of the main working chamber on the upper side of the main oil cylinder is generated by the auxiliary oil cylinder, and the hydraulic oil pressure of the auxiliary oil cylinder is determined by the weight of the counterweight block on the auxiliary piston. That is to say, the hydraulic oil pressure of the main oil cylinder equal to the hydraulic oil pressure of the auxiliary oil cylinder is fixed, so that the main oil cylinder can form a constant pressure on the dotting thimble, the dotting point position is ensured to have consistent depth and size, and the dotting quality is ensured to meet the design requirement. Particularly, the pressure of the dotting thimble on the surface of the stator can be conveniently adjusted by adjusting the weight of the balancing weight, so that the dotting device is suitable for the dotting work of stators made of different materials and with different surface hardness. Of course, the upper part of the cylinder body of the auxiliary oil cylinder can be opened, so that the balancing weight can be placed and replaced conveniently. In addition, the balancing weight can be set into a cylinder which is provided with a through hole in the center and sleeved on the piston rod of the auxiliary oil cylinder.
Preferably, the cross-sectional area of the primary working chamber is between 2 and 4 times the cross-sectional area of the secondary working chamber, such that the cross-sectional area of the secondary working chamber is substantially smaller than the cross-sectional area of the primary working chamber. Because the pressure intensity of the hydraulic oil in the auxiliary working cavity and the pressure intensity of the hydraulic oil in the main working cavity are the same, enough pressure intensity can be generated only by arranging a smaller auxiliary oil cylinder, and then the main oil cylinder can generate enough pressure intensity on the dotting thimble. That is to say, through the pressure amplification relation between the auxiliary oil cylinder and the main oil cylinder, on the premise of ensuring that the dotting thimble can form enough pressure on the surface of the stator, the volume of the auxiliary oil cylinder can be obviously reduced, and the overall dimension and the weight of the balancing weight are reduced.
In order to control the moving position of the vertical lifting rod, the horizontal moving mechanism comprises a bracket 71 with the lower end fixedly connected to the base and a horizontal guide rail 72 arranged at the upper end of the bracket, and the upper end of the vertical lifting rod is movably arranged on the horizontal guide rail. In addition, a limit block 73 is movably arranged on the horizontal guide rail outside the vertical lifting rod far away from the initial position, and a horizontal movement scale is arranged on the moving guide rail.
When dotting is needed, the limiting block can be moved to the position of the horizontal movement scale corresponding to the pole diameter and fixed according to the pole diameter parameter in the pole position and the pole coordinate of the dotting, then the vertical lifting rod is moved outwards until the vertical lifting rod is attached to the limiting block, and the vertical lifting rod is fixed. And then the loading platform is rotated, so that the dotting thimble can be quickly and accurately positioned to the polar coordinate of the point position, the dotting precision is ensured, the dotting procedure is simplified, and the dotting efficiency is improved.
It should be noted that one side of the horizontal guide rail can be provided with a dovetail groove, and the upper end of the vertical lifting rod and the limiting block are connected in the dovetail groove in a sliding manner, so that the vertical lifting rod and the limiting block can move horizontally along the horizontal guide rail. In addition, set up fastening screw at vertical lifter and stopper, when vertical lifter or stopper remove when targetting in place, screw up fastening screw and can make vertical lifter or stopper fix on horizontal guide rail.
Further, we can set a rotation angle scale from 0 to 359 degrees on the edge of the circular loading platform, and set a reference angle scale on the base. When we position the stator on the loading platform, the angular starting reference of the stator is aligned with the reference angular scale on the base.
Therefore, when dotting, the polar angle of the point position needing dotting is the angle which the loading platform should rotate, the loading platform is driven by the driving mechanism to rotate the stator by an angle equal to the polar angle, and the reference angle scale is just aligned to the rotation angle scale equal to the polar angle, so that the control of the rotation angle of the loading platform can be greatly facilitated.
Finally, as shown in fig. 4, a rotating shaft 21 rotatably connected with the base is vertically arranged at the center of the loading platform, a reduction gear 22 is arranged on the rotating shaft, the driving mechanism comprises a reduction gear set 23, the output end of the reduction gear set is in transmission connection with the reduction gear, and the input end of the reduction gear set is in transmission connection with a driving handle 24. When the driving handle is rotated, the loading platform can be driven to rotate through the reduction gear set and the reduction gear, and then the stator is driven to rotate.
Preferably, the speed reduction ratio between the driving handle and the rotating shaft is N: 1, wherein N is an integer between 4 and 10. Through the speed reduction of the reduction gear set, on one hand, labor saving of the driving handle is facilitated, on the other hand, if the loading platform needs to rotate by a small angle such as 0.5 degrees, the angle of rotation of the driving handle is 0.5N, and N is an integer between 4 and 10, so that the angle of rotation of the driving handle is between 2 and 5 degrees, and accurate control of the angle of rotation of the loading platform is facilitated.
It will be appreciated that a circular rolling groove may be provided between the loading platform and the base, and that balls may be provided in the rolling groove to provide good support of the loading platform by the base and to reduce friction during rotation of the loading platform. In addition, the loading platform can also be driven by a stepping motor and a corresponding speed reducing mechanism, so that the rotation angle can be accurately controlled, and the working intensity of operators can be reduced.
Claims (7)
1. A dotting positioning mechanism for drilling a stator of a water turbine comprises a base, a loading platform rotatably arranged on the base, a thimble fixing mechanism arranged above the loading platform, and a dotting thimble arranged on the thimble fixing mechanism, wherein a positioning and clamping device for clamping the stator is arranged on the loading platform, the dotting positioning mechanism is characterized in that a driving mechanism for driving the loading platform to rotate in a horizontal plane is arranged on the base, the thimble fixing mechanism comprises a horizontal moving mechanism and a vertical lifting rod, the dotting thimble is axially movably arranged at the lower end of the vertical lifting rod, a pressure element for abutting against the dotting thimble is arranged on the vertical lifting rod, the upper end of the vertical lifting rod is transversely movably connected to the horizontal moving mechanism, so that the vertical lifting rod can move from an initial position to a dotting position on the horizontal moving mechanism, when the vertical lifting rod is positioned at the initial position, the center of the dotting thimble is positioned on the rotating axis of the loading platform, and the horizontal moving track of the vertical lifting rod is positioned in the radial direction of the loading platform.
2. The drilling positioning mechanism for the stator of the water turbine as claimed in claim 1, wherein a stepped hole with a small opening and a large opening is formed at the lower end of the vertical lifting rod, the drilling thimble is fitted in the small hole of the stepped hole, a limiting disc located in the large hole is formed at the inner end of the drilling thimble, and the pressure element is a pressure spring disposed in the large hole and pressing against the limiting disc.
3. The dotting and positioning mechanism for the stator drilling of the water turbine as claimed in claim 2, wherein the pressure element comprises a main cylinder arranged at the lower end of the vertical lifting rod and auxiliary cylinders connected side by side to the main cylinder, the dotting thimble is arranged at the end of a piston rod extending downwards from the main cylinder, the upper part of the main cylinder is a main working chamber filled with hydraulic oil, an auxiliary piston arranged in the auxiliary cylinder in a vertically lifting manner is separated from the auxiliary working chamber at the lower part of the auxiliary cylinder, a counterweight is arranged at the upper side of the auxiliary piston, and the main working chamber is communicated with the auxiliary working chamber through a pipeline.
4. The drilling positioning mechanism for the stator of the water turbine as claimed in claim 3, wherein the cross-sectional area of the main working chamber is 2-4 times the cross-sectional area of the auxiliary working chamber.
5. The tapping point positioning mechanism for the stator of the water turbine as claimed in claim 1, wherein the horizontal moving mechanism comprises a horizontal guide rail, the upper end of the vertical lifting rod is movably disposed on the horizontal guide rail, a limit block is movably disposed on the horizontal guide rail outside the vertical lifting rod far from the initial position, and the moving guide rail is provided with a horizontal moving scale.
6. The drilling positioning mechanism for the stator of the water turbine as claimed in claim 5, wherein the loading platform has a rotation angle scale on the edge thereof, and a reference angle scale on the base.
7. The drilling positioning mechanism for the stator of the water turbine as claimed in claim 1, wherein a rotating shaft rotatably connected with the base is vertically arranged at the center of the loading platform, a reduction gear is arranged on the rotating shaft, the driving mechanism comprises a reduction gear set, an output end of the reduction gear set is in transmission connection with the reduction gear, an input end of the reduction gear set is in transmission connection with the driving handle, and the reduction ratio between the driving handle and the rotating shaft is N: 1, wherein N is an integer between 4 and 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020145384.7U CN211890810U (en) | 2020-01-22 | 2020-01-22 | Dotting positioning mechanism for drilling of stator of water turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020145384.7U CN211890810U (en) | 2020-01-22 | 2020-01-22 | Dotting positioning mechanism for drilling of stator of water turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211890810U true CN211890810U (en) | 2020-11-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020145384.7U Active CN211890810U (en) | 2020-01-22 | 2020-01-22 | Dotting positioning mechanism for drilling of stator of water turbine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113084774A (en) * | 2021-03-19 | 2021-07-09 | 东风延锋汽车饰件系统有限公司 | Automatic dotting device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113084774A (en) * | 2021-03-19 | 2021-07-09 | 东风延锋汽车饰件系统有限公司 | Automatic dotting device and method |
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