Hydraulic tensioning iron core hot jacket hoisting device and method thereof

Abstract

The invention discloses a hydraulic type tensioning iron core hot jacket hoisting device which comprises a pull rod, a hoisting assembly, a hydraulic pump, a pressing plate, a basic tensioning block and an inner sleeve. The whole hot jacket operation mode is converted from an original bolt extrusion tightening expansion mode to a hydraulic pressure extrusion expansion mode, safer and more reliable supporting expansion force, a faster and more efficient expansion block expansion mode, an expansion block fastening in-place mode capable of being visually judged and a simpler tool mounting and quitting operation process are achieved, and the production efficiency is improved. The requirements of safety, quality, efficiency and the like on hot jacket operation of the stator iron core with the winding are effectively met; in addition, the invention further provides a hoisting method using the hydraulic tensioning iron core hot jacket hoisting device, pressurization can be conducted through a hydraulic pump, when a certain design pressure value is reached, the tensioning blocks are completely and tightly attached to an inner cavity of the iron core, and the effects of expanding and supporting hoisting of the stator iron core with the winding are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of motor assembly equipment, and in particular relates to a hydraulically tightened core shrink-fit lifting device and a method thereof. Background Art

[0002] At present, among the motor products produced, the number and types of motor products using the shrink-fit process of stator core with windings are increasing, including various medium- and high-speed permanent magnet motor stators with hollow water-cooled shrink-fit structures. With the increasing application scenarios and models of stators using shrink-fit of stator core with windings, the requirements for shrink-fit operations are constantly increasing, especially the requirements for safety, quality, efficiency, etc. during the shrink-fit operation.

[0003] The main deficiencies in the existing shrink-fit operation of the stator core with windings are as follows: (1) The shrink-fit tooling expansion block tightening operation relies on manpower, which varies from person to person. The tightening force of different people is different, unstable, and cannot be quantified; (2) The bolt tightening operation relies on the tightening of the bolts to provide the extrusion force, and the wrench needs to be tightened inwards one circle at a time. The operation process is slow and takes a long time; (3) The final tightening process of the bolts relies on hammering to achieve the bolt tightening expansion. The stability and reliability of the tightening are difficult to determine, and there is a situation where judgment is made based on personal operation experience. The safety and quality assurance of the operation are not high.

[0004] In response to the above problems, the hydraulic tensioning core shrink-fit lifting device provided by the present invention is committed to achieving a safer and more reliable supporting tensioning force, a faster and more efficient expansion block tensioning method, a more intuitive and identifiable expansion block fastening method, and a simpler tooling installation and exit operation process. Summary of the invention

[0005] In order to solve the problems of unsafety and non-standardization in the shrink-fit operation of the stator core with winding in the above-mentioned prior art, the present invention aims to provide a method of converting the entire operation mode from the original bolt extrusion and tightening expansion mode to a hydraulic pressure extrusion and tightening mode, so as to achieve a safer and more reliable support tensioning force, a faster and more efficient expansion block tightening mode, a more intuitive and judgable expansion block fastening mode, and a simpler tooling installation and exit operation process, so as to effectively meet the safety, quality, efficiency and other requirements of the shrink-fit operation of the stator core with winding.

[0006] The present invention provides a hydraulically tightened core shrink-fit lifting device, the specific technical scheme of which is as follows: a pull rod, a lifting assembly, a hydraulic pump, a pressing plate, a basic expansion block, and an inner sleeve; The pull rod is cylindrical, and a lifting assembly is provided at one end; The hydraulic pump and the pressure plate sleeve are arranged on the pull rod, and nuts are arranged at both ends. The hydraulic pump and the pressure plate sleeve are connected with the nuts to limit the position on the pull rod; The pressing plate is provided with a waist-shaped hole, and a screw passes through the waist-shaped hole to connect the pressing plate with the expansion block; a sliding block is provided on the inner side of the basic expansion block; The inner sleeve is connected to the pull rod, the inner sleeve is trapezoidal, and is embedded in the bottom of the basic expansion block. The basic expansion block slides along the outer wall of the inner sleeve, and grooves are provided on the pressure plate and the inner sleeve. One end of the spring is installed in the groove of the pressure plate, and the other end of the spring is installed in the groove of the inner sleeve.

[0007] Preferably, an extension expansion block is further provided on the basic expansion block, and the extension expansion block is detachably connected to the outer side surface of the basic expansion block and contacts the inner cavity of the iron core.

[0008] Preferably, the number of the basic expansion blocks is several, and the waist-shaped holes on the pressure plate are arranged corresponding to the number of the screws.

[0009] Preferably, the basic expansion blocks are evenly distributed around the pull rod and are arranged on the outer wall of the inner sleeve for sliding connection.

[0010] Preferably, a pressing sleeve is provided between the bottom of the inner sleeve and the nut. The pressing sleeve is detachably mounted on the pull rod, and the length of the pressing sleeve can be adaptively selected and set according to different core lengths.

[0011] Preferably, the lifting assembly is specifically a lifting ring, and the lifting ring is detachably arranged on one end of the pull rod.

[0012] Preferably, the pull rod is provided with threads, and the nut, the pressing sleeve and the lifting ring are all detachably mounted on the pull rod through the threads.

[0013] Preferably, the hydraulic pump is also provided with a hydraulic port for connecting to a hydraulic oil tank.

[0014] Preferably, the hydraulic pump is also provided with a pressure gauge for displaying specific values ​​during pressurization.

[0015] At the same time, the present invention also provides a method for lifting a hydraulically tightened core shrink-fit using the hydraulically tightened core shrink-fit lifting device, and the specific steps are as follows: The lifting method includes the steps of tightening the foundation expansion block and the iron core and separating the expansion block from the iron core; The steps of tightening the basic expansion block and the iron core are: tightening the nut, starting the hydraulic pump to move axially to move the pressure plate downward, so that the pressure plate pushes the basic expansion block downward, so that the basic expansion block slides outward along the trapezoidal outer side surface in the inner sleeve, and when the basic expansion block slides outward and is in close contact with the iron core, the hydraulic pump is stopped, and the hydraulic pressure in the basic expansion block is controlled and mathematically converted into precise control of the tensioning force, so that parameterized and visualized adjustment of the tensioning force can be achieved; The steps for separating the basic expansion block from the iron core are: loosen the nut and turn off the hydraulic pump. At this time, the spring pushes the pressure plate to move upward along the pull rod, and the pressure plate drives the screw to move upward. The screw drives the basic expansion block to slide along the outer surface of the inner sleeve toward the pull rod, thereby separating the basic expansion block from the iron core.

[0016] The beneficial effects of the technical solution are: a hydraulically tightened core shrink-fit lifting method and device are used. In view of the shortcomings of the shrink-fit operation of the stator core with winding of small and medium-sized motors, compared with the prior art, the tightening operation of the tooling expansion block relies on manual bolt tightening, the manual tightening force varies and cannot be quantified, the bolt tightening operation efficiency is low, and the reliability of the tightening stability is difficult to determine, a set of shrink-fit lifting tooling components consisting of a hydraulic pump, a pull rod, an expansion block, an inner sleeve, a pressure plate, etc. is used. During operation, the expansion block of the shrink-fit tooling is placed in close contact with the inner cavity of the stator core with winding, and pressurized by a hydraulic pump. With the axial stroke of the hydraulic pump, the expansion block is gradually expanded. When a certain design pressure value is reached, the expansion block is completely and tightly fitted to the inner cavity of the core, and can support the stator core with winding to be turned over and placed vertically and lifted for shrink-fit operation. After the introduction of hydraulic pressure expansion, a stable, uniform and strong hydraulic extrusion force is output, and the entire operation mode is converted from the original bolt extrusion and tightening expansion mode to a hydraulic pressure extrusion and tightening mode, achieving a safer and more reliable support and tightening force, a faster and more efficient expansion block tightening mode, a more intuitive and identifiable expansion block tightening mode, and a simpler tooling installation and exit operation process, effectively meeting the safety, quality, efficiency and other requirements of shrink-fit operation of stator core with winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a top view of a hydraulically tensioned core shrink-fit lifting device in a specific embodiment; Figure 2 for Figure 1 Cross-sectional view along the AA direction.

[0019] The specific figures are: 1. Pull rod; 2. Lifting assembly; 3. Hydraulic pump; 4. Pressure plate; 5. Foundation expansion block; 6. Inner sleeve; 7. Nut; 8. Waist-shaped hole; 9. Screw; 10. Spring; 11. Extension expansion block; 12. Press sleeve. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0022] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0024] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0025] Please refer to Figure 1 and Figure 2 , the technical solution of the present invention, a hydraulically tightened core shrink-fit lifting device provided in a specific embodiment is described, and its structure includes: a pull rod 1, a lifting assembly 2, a hydraulic pump 3, a pressing plate 4, a basic expansion block 5, and an inner sleeve 6; like Figure 1 and Figure 2 As shown, the pull rod 1 is a cylindrical part, serving as the main part of the entire lifting device, and a lifting assembly 2 is provided at one end thereof, which is used as a mounting fulcrum during lifting to lift the iron core; And as Figure 2 As shown, in this embodiment, as the main components for supporting, the hydraulic pump 3 and the pressure plate 4 are sleeved on the pull rod 1, and nuts 7 are provided at both ends of the hydraulic pump 3 and the pressure plate 4. The hydraulic pump 3 and the pressure plate 4 are sleeved by connecting with the nuts 7 to perform limit locking on the pull rod 1; And as Figure 1 As shown, in this embodiment, a waist-shaped hole 8 is provided on the pressing plate 4, and a screw 9 passes through the waist-shaped hole 8 to connect the pressing plate 4 with the expansion block; a sliding block is provided on the inner side of the basic expansion block 5; The inner sleeve 6 is connected to the pull rod 1, the inner sleeve 6 is trapezoidal, and is embedded in the bottom of the basic expansion block 5. The basic expansion block 5 slides along the outer wall of the inner sleeve 6, and the pressure plate 4 and the inner sleeve 6 are both provided with grooves, one end of the spring 10 is installed in the groove of the pressure plate 4, and the other end of the spring 10 is installed in the groove of the inner sleeve 6; In this embodiment, by pressurizing the hydraulic pump 3, the pressure plate 4 moves downward with the downward axial stroke of the hydraulic pump 3, driving the basic expansion block 5 to gradually expand along the trapezoidal outer side of the inner sleeve 6. At the same time, the spring 10 is also compressed. When a certain design pressure value is reached, the expansion block is completely and tightly fitted with the inner cavity of the core, so as to achieve the function of expanding and supporting the lifting of the stator core with windings. After the lifting is completed, the pressurization of the hydraulic pump 3 is cancelled, and the pressure plate 4 will move upward along the pull rod 1 under the push of the elastic force of the spring 10. Since the pressure plate 4 and the basic expansion block 5 are connected together by the screws 9, the pressure plate 4 will also drive the movement of the basic expansion block 5 when it moves upward.

[0026] As a preferred embodiment, the structure of the expansion block is further defined, such as Figure 2 As shown, in this example, the basic expansion block 5 is further provided with an extension expansion block 11, and the extension expansion block 11 is detachably connected and provided on the outer side of the basic expansion block 5, and contacts with the inner cavity of the iron core; Through the design of the detachable extension block 11, the operator can choose to install the extension block 11 of a certain thickness according to the inner diameter size of the iron core to be hoisted, so as to obtain a better tensioning effect.

[0027] Preferably, the specific structural setting of the expansion block in the present embodiment is further limited. In order to better expand and support the iron core tightly, the number of the basic expansion blocks 5 is several, and the multiple basic expansion blocks 5 jointly tension and support the inner wall of the iron core, so that the force is more dispersed, avoiding stress concentration leading to lifting failure or iron core deformation and other effects. At the same time, in order to cope with the number of the basic expansion blocks 5, the waist-shaped holes 8 on the pressure plate 4 and the number of the screws 9 are also set accordingly.

[0028] Furthermore, the specific arrangement and distribution of the expansion block in the present embodiment is further limited, so as to keep the tensioning force on the core uniform. Figure 1 As shown, in this embodiment, the specific number of the basic expansion blocks 5 is 3 groups, and the 3 groups of basic expansion blocks 5 are evenly distributed around the tie rod 1 and arranged on the outer wall of the inner sleeve 6 for sliding connection. The evenly distributed arrangement at an angle can make the core more evenly stressed, thereby increasing the reliability of the core hot-sleeving hoisting. In other embodiments, in order to better lift other cores, the specific number of the basic expansion blocks 5 can be selected and set according to actual conditions, and this solution does not limit the specific number requirement.

[0029] As a preferred example, Figure 2 As shown, in the present embodiment, a pressing sleeve 12 is further provided between the bottom of the inner sleeve 6 and the nut 7. The pressing sleeve 12 is detachably mounted on the pull rod 1. The length of the pressing sleeve 12 can be adaptively selected and set according to different core lengths. By selecting different lengths of the pressing sleeve 12, the hydraulic tensioning core shrink-fit lifting device provided in the present embodiment can be conveniently applied to the shrink-fit lifting of long strip-type stator cores with windings of different lengths, thereby improving the application adaptability of the device.

[0030] As a preferred example, Figure 2 As shown, in this embodiment, the lifting component 2 is specifically a lifting ring, which is detachably arranged at one end of the pull rod 1. During lifting, a special lifting tool such as a wire rope or a hook is used to pass through the hollow ring to lift the iron core and the device.

[0031] Further, such as Figure 2 As shown, the pull rod 1 provided in this embodiment is further limited. The pull rod 1 is provided with threads. The nut 7, the pressing sleeve 12 and the lifting ring are all detachably mounted on the pull rod 1 through the threads to achieve installation.

[0032] Preferably, the specific structure of the hydraulic pump 3 described in the present embodiment is further limited. The hydraulic pump 3 is also provided with a hydraulic port for connecting to a hydraulic oil tank. After the hydraulic pressure is introduced through the hydraulic port, it replaces the manual tightening of bolts in the prior art, avoiding the shortcomings of uneven manpower, unreliable and unquantifiable tightness, and instead outputs a stable, uniform, strong and quantifiable hydraulic extrusion force, converting its entire operation mode from the original bolt extrusion and tightening mode to a hydraulic pressure extrusion and tightening mode, which also avoids the disadvantages of the original bolt tightening operation, which requires a wrench to tighten the bolts one circle at a time, resulting in a slow operation process and a long time. After the shrink fitting is completed, the hydraulic pressure of the hydraulic pump 3 is immediately removed, and the tooling can be immediately removed and taken away for use in the next shrink fitting of the stator core with windings. Compared with the disassembly with a wrench, the efficiency is extremely high.

[0033] Furthermore, the specific structure of the hydraulic pump 3 described in the present embodiment is further limited. The hydraulic pump 3 is also provided with a pressure gauge for displaying the specific value when pressurized. The hydraulic pressure tightening process provided by the lifting device provided in the present embodiment is safer than the wrench tightening operation, which relies on experience to judge whether the tightening is in place. It is also not easy to cause quality hazards and operation hazards such as extrusion deformation and cracking of the iron core. The stable and quantifiable hydraulic pressure extrusion method is realized as follows: the expansion pressure F=P*S, the static friction force f=F*u, - S is the area of ​​the expansion block contacting the iron core, and u is the sliding friction coefficient. In order to ensure the vertical lifting of the iron core after tightening, it is necessary to ensure that f≧mg, that is, P*S*u≧mg. For stator cores with windings of different core inner diameters and weights, the above calculation method can be used to control the pressure gauge value P on the hydraulic pump 3 during pressurization, so as to realize safe and quantifiable expansion and tightening operations, and realize lifting and transportation simply and efficiently. At the same time, the present invention also provides a method for lifting a core by shrink-fitting using the above-mentioned hydraulically tightened core shrink-fitting lifting device, and the specific steps are as follows: The lifting method includes the steps of tightening the foundation expansion block 5 and the iron core and separating the expansion block from the iron core; The steps of tightening the basic expansion block 5 and the core are as follows: tighten the nut 7 to limit the position, and then start the hydraulic pump 3. Under the action of the hydraulic oil, the hydraulic pump 3 moves axially to move the pressure plate 4 downward, so that the pressure plate 4 pushes the basic expansion block 5 downward, so that the basic expansion block 5 slides outward along the trapezoidal outer side surface in the inner sleeve 6, and drives the extended expansion block 11 to slide outward. When the basic expansion block 5 slides outward and is in close contact with the core, the hydraulic pump 3 is stopped to achieve the function of expanding the shape and supporting the lifting of the stator core with winding; in this embodiment, Since the expansion pressure F=P*S, the static friction force f=F*u, -- S is the area of ​​the expansion block contacting the core, u is the sliding friction coefficient, in order to ensure the vertical lifting of the core after tightening, it is necessary to ensure that f≧mg, that is, P*S*u≧mg, for stator cores with windings of different core inner diameters and weights, the above calculation method is used to control the pressure gauge value P on the hydraulic pump 3 during pressurization during operation, that is, the control of the hydraulic pressure in the basic expansion block, which is converted into precise control of the tensioning force through the above formula, and can realize parameterized and visualized adjustment of the tensioning force; The steps of separating the basic expansion block 5 from the core are as follows: loosen the nut 7 and turn off the hydraulic pump 3. At this time, the spring 10 pushes the pressure plate 4 to move upward along the pull rod 1, and the pressure plate 4 drives the screw 9 to move upward. The screw 9 drives the basic expansion block 5 to slide along the outer surface of the inner sleeve 6 toward the pull rod 1, thereby separating the basic expansion block 5 from the core, achieving the effect of lifting the stator core with winding after the expansion support is lifted.

[0034] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulically tightened core shrink fit lifting device, characterized in that: include: Pull rod (1), lifting assembly (2), hydraulic pump (3), pressing plate (4), foundation expansion block (5), inner sleeve (6); The pull rod (1) is cylindrical, and a lifting assembly (2) is provided at one end; The hydraulic pump (3) and the pressure plate (4) are sleeved on the pull rod (1), and nuts (7) are provided at both ends. The hydraulic pump (3) and the pressure plate (4) are sleeved on the pull rod (1) by being connected to the nuts (7) to limit the position of the pull rod (1); The pressing plate (4) is provided with a waist-shaped hole (8), and a screw (9) passes through the waist-shaped hole (8) to connect the pressing plate (4) with the expansion block; a sliding block is provided on the inner side surface of the basic expansion block (5); The inner sleeve (6) is connected to the pull rod (1), the inner sleeve (6) is trapezoidal and is embedded in the bottom of the basic expansion block (5), the basic expansion block (5) slides along the outer wall of the inner sleeve (6), and the pressure plate (4) and the inner sleeve (6) are both provided with grooves, one end of the spring (10) is installed in the groove of the pressure plate (4), and the other end of the spring (10) is installed in the groove of the inner sleeve (6).

2. The hydraulically tensioned core shrink fit lifting device according to claim 1 is characterized in that: An extension expansion block (11) is also provided on the basic expansion block (5), and the extension expansion block (11) is detachably connected to the outer side surface of the basic expansion block (5) and is in contact with the inner cavity of the iron core.

3. The hydraulically tensioned core shrink fit lifting device according to claim 2 is characterized in that: The number of the basic expansion blocks (5) is a plurality, and the number of the waist-shaped holes (8) and the number of the screws (9) on the pressing plate (4) are also arranged correspondingly.

4. The hydraulically tensioned core shrink fit lifting device according to claim 3 is characterized in that: The basic expansion blocks (5) are evenly distributed around the pull rod (1) and are arranged on the outer wall of the inner sleeve (6) for sliding connection.

5. The hydraulically tensioned core shrink fit lifting device according to claim 1, characterized in that: A pressing sleeve (12) is also provided between the bottom of the inner sleeve (6) and the nut (7); the pressing sleeve (12) is detachably sleeved on the pull rod (1); and the length of the pressing sleeve (12) can be adaptively selected and set according to different core lengths.

6. The hydraulically tensioned core shrink fit hoisting device according to claim 5, characterized in that: The lifting assembly (2) is specifically a lifting ring, and the lifting ring is detachably arranged at one end of the pull rod (1).

7. The hydraulically tensioned core shrink fit hoisting device according to claim 6, characterized in that: The pull rod (1) is provided with a thread, and the nut (7), the pressing sleeve (12), and the lifting ring are all threaded and detachably sleeved on the pull rod (1).

8. The hydraulically tensioned core shrink fit hoisting device according to any one of claims 1 to 7, characterized in that: The hydraulic pump (3) is also provided with a hydraulic port for connecting to a hydraulic oil tank.

9. The hydraulically tensioned core shrink fit hoisting device according to claim 8, characterized in that: The hydraulic pump (3) is also provided with a pressure gauge for displaying specific values ​​during pressurization.

10. A construction method of a hydraulically tightened core shrink-fit lifting device, a method for lifting a stator core with windings by shrink-fitting using the hydraulically tightened core shrink-fit lifting device as claimed in any one of claims 1 to 9, characterized in that: The specific steps are as follows: The lifting method comprises the steps of tightening the foundation expansion block (5) and the iron core and separating the expansion block from the iron core; The steps of tightening the basic expansion block (5) and the iron core are as follows: tightening the nut (7), starting the hydraulic pump (3) to axially move the pressure plate (4) downward, so that the pressure plate (4) pushes the basic expansion block (5) downward, so that the basic expansion block (5) slides outward along the trapezoidal outer surface of the inner sleeve (6); when the basic expansion block (5) slides outward and is in close contact with the iron core, the hydraulic pump (3) is stopped, and the hydraulic pressure in the basic expansion block (5) is controlled and mathematically converted into precise control of the tensioning force, so that parameterized and visualized adjustment of the tensioning force can be achieved; The steps for separating the basic expansion block (5) from the iron core are as follows: loosening the nut (7) and turning off the hydraulic pump (3), at which time the spring (10) pushes the pressure plate (4) to move upward along the pull rod (1), the pressure plate (4) drives the screw (9) to move upward, and the screw (9) drives the basic expansion block (5) to slide along the outer surface of the inner sleeve (6) toward the pull rod (1), thereby separating the basic expansion block (5) from the iron core.

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