A main bracket welding internal and external expansion sleeve fixture

Abstract

The present invention discloses a fixture for welding internal and external expansion sleeves to a main support. The fixture comprises: a mandrel assembly comprising a mandrel and a positioning structure, the positioning structure being provided with a first step structure for positioning at one end of a main housing and achieving axial positioning between the main housing and the main support; a mounting seat assembly; a wedge block assembly comprising at least three wedge block groups circumferentially disposed around the mandrel, each wedge block group comprising an inner wedge block and an outer wedge block, the inclined surface of which is in close contact with the inclined surface of the inner wedge block and is positioned at the end of the fixture; and a core alignment assembly for controlling the simultaneous movement of all inner wedge blocks along the inclined surface of the outer wedge blocks. This assembly ensures that, when the inner wedge blocks move toward one end of the fixture, the inner wedge blocks clamp the mandrel while the outer wedge blocks move outward to closely contact the inner diameter of the stator. This assembly not only improves assembly efficiency but also enhances the coaxiality between the stator and the main support.

Description

Technical Field

[0001] The invention belongs to the technical field of main bracket welding, and in particular relates to a main bracket welding internal and external expansion sleeve clamp. Background Art

[0002] One of the most core functional components of an air conditioner is its compressor, which includes core components such as the main housing, stator, rotor shaft system, and shaft support. After the stator and rotor shaft system are assembled, they form an electric spindle similar to a built-in motor, providing power for the compressor. Figure 5 、 Figure 6 As shown, the compressor stator 2 is integrally formed with the main housing 1 by shrink fitting or welding; the main bracket 3 is then integrally welded with the main housing 1. After assembly, the coaxiality of the axis A of the stator 2 and the axis B of the main bracket 3 must be ensured.

[0003] The existing solution for the rotor shaft support welding fixture is: the main casing 1 is used as the process reference for designing and manufacturing the fixture 4, and the clearance positioning method is used for radial positioning between the fixture 4 and the main casing 1, and the end face contact method is used for axial positioning between the fixture 4 and the main bracket 3. After positioning, the main bracket 4 and the main casing 1 are welded.

[0004] Normally, under the premise that the roundness and verticality of the workpiece are very consistent, and when the assembly cycle is slow, the positioning gap between the positioning fixture and the workpiece can be designed to be smaller. However, in the mass production site of compressor assembly, the roundness accuracy of the compressor itself is not high and there are batch size consistency errors. In addition, the handling mechanism also has repeated positioning errors. With the traditional technical solution, since the main shell is used as the transition process reference, in order to ensure the smoothness of the clamping, in general, the positioning gap between the fixture and the main shell needs to be greater than 0.15mm. This error will directly affect the coaxiality of the stator and rotor. In addition, the coaxiality of the main shell and the inner hole of the stator will affect the coaxiality between the stator and rotor. This traditional technical solution is only suitable for welding the rotor main bracket with general accuracy requirements and low production cycle requirements. Summary of the Invention

[0005] In order to solve the problem of low coaxiality between the stator and the main bracket during welding of the main bracket in the existing method, the present invention provides a main bracket welding internal and external expansion sleeve clamp, which not only has high assembly efficiency but also can improve the coaxiality between the stator and the main bracket.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] The present invention discloses a main bracket welding internal and external expansion sleeve fixture, comprising:

[0008] A mandrel assembly, the mandrel assembly comprising a mandrel and a positioning structure for securing the mandrel and mounted on the main support so that the axis of the mandrel coincides with the axis of the main support, the positioning structure being provided with a first step structure for being placed at one end of the main housing and achieving axial positioning between the main housing and the main support;

[0009] A mounting seat assembly, the mounting seat assembly including a mounting seat, the mounting seat being provided with a second step structure for fixing the fixture and a third step structure for achieving axial and radial limitation of the main housing;

[0010] A wedge block assembly, the wedge block assembly comprising at least three wedge block groups disposed circumferentially of the mandrel, each wedge block group comprising an inner wedge block and an outer wedge block having an inclined surface in close contact with the inclined surface of the inner wedge block and disposed on an end portion of the fixture;

[0011] The core adjustment assembly is used to control all the inner wedge blocks to move simultaneously along the inclined surface of the outer wedge blocks, so that when the inner wedge blocks move toward one end of the clamp, the inner wedge blocks clamp the core rod while the outer wedge blocks move outward to fit closely with the inner diameter of the stator.

[0012] Compared with the prior art, the present invention has at least the following advantages and beneficial effects:

[0013] The present invention fixes a core rod assembly on the main support, wherein the core rod of the core rod assembly is coaxial with the main support, and uses the core rod to extend the axis of the main support into the stator. The core adjustment assembly drives the inner wedge block to move downward, which drives the pull rod to move downward for core adjustment, thereby realizing the coaxiality adjustment of the main support axis and the stator axis. The adoption of this solution not only improves the assembly efficiency, but also improves the coaxiality of the main support and the stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a schematic structural diagram of a fixture for welding inner and outer expansion sleeves to a main support according to the present invention;

[0016] Figure 2 Schematic diagram of the structure of the mandrel assembly;

[0017] Figure 3 A schematic diagram of the structure of the core rod assembly being installed on the main bracket;

[0018] Figure 4 It is a cross-sectional view of the core alignment assembly, the inner wedge block, and the mounting seat assembly;

[0019] Figure 5 It is a structural diagram of the existing stator and main housing;

[0020] Figure 6 This is a structural diagram of the existing main support.

[0021] In the figure, 1-main housing, 2-stator, 3-main bracket, 4-clamp, 51-core rod, 52-fixed seat, 53-first step structure, 54-locating pin, 55-connecting structure, 6-mounting seat, 61-second step structure, 62-third step structure, 71-inner wedge block, 72-outer wedge block, 81-pull rod, 811-mounting hole, 812-pressure plate, 813-limiting protrusion, 82-push cylinder, 83-spring, 84-guide sleeve, 91-spring sleeve, 92-rubber ring, 93-anti-rotation rod. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0024] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0026] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended only to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0028] In order to improve the coaxiality between the stator and the main bracket during welding, the present invention discloses a main bracket welding internal and external expansion sleeve fixture. Figures 1 to 4 As shown, the main bracket welding internal and external expansion sleeve fixture of the present invention includes a mandrel assembly, a mounting seat assembly, a wedge assembly, and a core alignment assembly. The mandrel assembly is used to extend the axis of the main bracket 3; the mounting seat assembly is used to secure the fixture to the main housing 1, achieving axial and radial positioning of the fixture and the main housing 1; the wedge assembly has adjustable outer and inner diameters to adjust the axis between the fixture and mandrel assembly, ultimately achieving coaxiality; and the core alignment assembly is used to control the outer and inner diameters of the wedge assembly.

[0029] Specifically, such as Figure 2 As shown, the core rod assembly includes a core rod 51 and a positioning structure, wherein the core rod 51 is fixed on the positioning structure, and the positioning structure is used to be installed on the main bracket 3 so that the axis C of the core rod coincides with the axis of the main bracket. The positioning structure is provided with a first step structure 53 for being placed at one end of the main shell 1 and realizing axial positioning between the main shell 1 and the main bracket 3. Figure 3 As shown, the positioning structure is used to extend the axis length of the main support after being installed on the main support 3, as shown in FIG. Figure 1 As shown, after the first step structure 53 of the positioning structure is placed at one end of the main shell 1, the axial positioning of the main bracket 3 and the end of the main shell 1 can be achieved.

[0030] like Figure 1As shown, the mounting seat assembly includes a mounting seat 6, which is provided with a second step structure 61 for fixing the clamp 4 and a third step structure 62 for achieving axial and radial positioning of the main housing 1. In other words, the second step structure 61 and the third step structure 62 simultaneously achieve axial and radial positioning of the clamp 4 and the main housing 1.

[0031] like Figure 1 、 Figure 4 As shown, the wedge block assembly is placed in the stator and includes at least three wedge block groups placed circumferentially of the core rod 51. Each wedge block group includes an inner wedge block 71 and an outer wedge block 72, whose inclined surface is in close contact with the inclined surface of the inner wedge block 71 and is placed on the end of the clamp 4. The inner wedge blocks 71 of each wedge block group have the same structure and specifications, and the outer wedge blocks 72 of each wedge block group have the same structure and specifications. The inner wedge blocks 71 and the outer wedge blocks 72 are both structures with one side being an inclined surface and the other side being a vertical surface. It should be noted that the vertical surface here refers to the state in which the surface is parallel to the axial direction of the core rod 51. The outer wedge block 72 is placed on the end of the clamp 4. Since the clamp is in an axially positioned state, the outer wedge block 72 is also fixed in the axial direction, but is movable in the radial direction. The inclined surface of the inner wedge block 71 is in close contact with the inclined surface of the outer wedge block 72, so the inner wedge block 71 is movable in both the axial and radial directions.

[0032] The core alignment assembly is used to control all inner wedge blocks 71 to move simultaneously along the inclined surface of the outer wedge block 72, so that when the inner wedge blocks 71 move toward one end of the fixture 4, the inner wedge blocks 71 clamp the core rod 51 while the outer wedge blocks 72 move outward to closely contact the inner diameter of the stator 2. Because the inner wedge blocks 71 are movable in both the axial and radial directions, when the core alignment assembly controls the inner wedge blocks 71 to move along the inclined surface of the outer wedge block 72, the inclined surface squeezes the inner wedge blocks 71 outward to closely contact the inner diameter of the stator 2. When the inner wedge blocks 71 clamp the core rod 51 and the outer wedge blocks 72 move outward to closely contact the inner diameter of the stator 2, the axis of the core rod 51 is adjusted to be coaxial with the axis of the fixture, thereby achieving coaxiality between the main bracket 3 and the axes of the fixture and the main housing 1.

[0033] The above structure can not only improve the coaxiality between the main bracket 3 and the clamp and the stator, but also achieve rapid adjustment.

[0034] The positioning structure is used to be installed on the main bracket 3, and there are many ways to implement it. In order to facilitate quick installation, such as Figure 2 、 Figure 3 As shown, the positioning structure includes a fixing base 52, a positioning pin 54 provided at one end of the fixing base 52, and a connecting structure 55 for fixing the fixing base 52 to the main bracket 3. The first step structure 53 is provided on the fixing base 52. During installation, the positioning pin 54 is aligned with the positioning hole on the main bracket 3 and the connecting structure 55 is installed. The connecting structure 55 is preferably a bolt.

[0035] The first step structure 53 is annular, and the positioning pin 54 and the connecting structure 55 are disposed inside the first step structure 53 .

[0036] The core adjustment assembly realizes the movement control of the inner wedge block 71, and there are many ways to realize it. For example, a structure of a pull rod 81 and a push cylinder 82 is adopted. One end of the pull rod 81 is used to fix the inner wedge block 71, and the output shaft of the push cylinder 82 is connected to the other end of the pull rod 81 to realize the axial movement control of the pull rod 81. However, with this structure, when controlling the pull rod to move downward, it automatically stops after being adjusted into position. Preferably, a spring is used to realize the downward movement control of the pull rod 81. For details, refer to Figure 1 、 Figure 4 The core adjustment assembly includes a pull rod 81, a push cylinder 82 and a spring 83.

[0037] One end of the pull rod is cylindrical and is surrounded by mounting holes 811 for mounting the inner wedge block 71 so that the inner side and inclined surface of the inner wedge block 71 are respectively positioned on the inner and outer sides of the pull rod. A pressure plate 812 is fixed to the other end and is disposed on the outer periphery of the pull rod. A push cylinder 82 is disposed at the bottom of the mounting seat 6, and its output shaft abuts against one end of the pull rod 81. That is, there is no connection between the output shaft of the push cylinder 82 and the pull rod 81. The push cylinder 82 can push the pull rod 81 upward, but cannot pull it downward. A spring mounting cavity is disposed at the bottom of the mounting seat 6, and the spring mounting cavity is positioned around the pull rod 81. A spring 83 is positioned between the mounting seat 6 and the pressure plate 812 and is used to push the pull rod 81 toward the push cylinder 82. That is, the spring is compressed, and this force acting on the pressure plate 812 has the effect of driving the pull rod 81 downward.

[0038] With the above structure, after the fixture, main housing 1, and stator are integrally mounted on the mounting base assembly, the output shaft of the push cylinder 82 is controlled to move upward to drive the pull rod 81 upward, thereby increasing the diameter of the circle where the inner wedge block 71 is located. The main bracket 3 and the core rod assembly are then installed integrally on the main housing 1. At this time, the core rod 51 is placed between the multiple inner wedge blocks 71. The output shaft of the push cylinder 82 is then controlled to move downward. At this time, due to the compression of the spring, its compression force acts on the pressure plate 812 to drive the pull rod 81 downward. During the downward movement, the inner wedge block 71 pushes the outer wedge block 72 outward, and the inner side of the inner wedge block 71 moves toward the core rod 51 until the inner wedge block 71 clamps the core rod 51 and the outer wedge block 72 is in close contact with the inner diameter of the stator 2.

[0039] With the above structure, the pull rod is driven downward by the force of the spring, and the size of the spring force can be adjusted by changing the specifications of the spring to ensure that the wedge block assembly does not cause deformation when clamping the workpiece, thereby achieving higher precision and stability.

[0040] In order to improve the stability of the pull rod moving downward and achieve the coaxiality adjustment accuracy, the pressure plate 812 is annular and multiple springs are provided and evenly distributed around the core rod 51.

[0041] The wedge block groups can be set to any number greater than or equal to 3 as needed, such as 3, 4, 5, 6, 7, 8, 9, etc., and can be evenly distributed around the pull rod 81.

[0042] To improve the stability of the tie rod and prevent relative rotation between the tie rod 81 and the mounting base during alignment, a rotation-stopping structure is provided between the tie rod 81 and the mounting base 6 to limit its rotation. There are many ways to implement a rotation-stopping structure. For ease of installation, the rotation-stopping structure is exemplarily a rotation-stopping rod 93. Both the tie rod 81 and the mounting base 6 are provided with rotation-stopping holes for mounting the rotation-stopping rod 93. The rotation-stopping holes are strip-shaped holes arranged along the axis of the tie rod 81.

[0043] One side of the inner wedge block 71 and the outer wedge block 72 is an inclined surface, and the other side is a plumb surface. The inner wedge block 71 is installed at the mounting hole 811 of the pull rod. There are various ways to install it, such as using a fixed connection such as bonding. However, using a fixed connection method is not convenient for maintenance and replacement and is not conducive to installation. In order to improve the installation stability of the inner wedge block 71 while improving the convenience of installation of the inner wedge block 71, Figure 4 As shown, the pull rod is provided with limiting protrusions 813 for limiting the ends of the inner wedge block 71. The two limiting protrusions 813 clamp the inner wedge block 71 from both ends. The inner wedge block 71 is placed on one side of the pull rod 81 and has at least two protrusion structures, and each protrusion structure is placed in a corresponding mounting hole 811. This structure can prevent the inner wedge block 71 from radially moving relative to the pull rod during the core alignment process. Figure 4 As shown, the inner wedge block 71 is placed on one side of the pull rod 81 to form two protruding structures. At this time, the two protruding structures are respectively suitable for the two mounting holes 811. The end faces of the protruding structures on the same inner wedge block 71 are placed in the same plane.

[0044] On the basis of any of the above structures, in order to facilitate the installation of the core rod 51, the core adjustment assembly also includes a guide sleeve 84 placed at the end of the pull rod 81 and used to guide the installation of the core rod 51. The diameter of the guide sleeve 84 at the end away from the pull rod 81 is larger than the diameter at the end close to the pull rod 81.

[0045] Based on any of the above structures, to protect the core rod 51 and stator 2 during the alignment process, prevent the wedge blocks from directly contacting the core rod 51 and stator 2, and ensure the required clearance between the workpiece and the fixture, elastic members are provided on the inner side of the inner wedge block 71 and / or the outer side of the outer wedge block 72. For example, the elastic member on the inner side of the inner wedge block 71 is a spring sleeve 91. The elastic member on the outer side of the outer wedge block 72 is a rubber ring 92.

[0046] By providing a spring sleeve 91 and a rubber ring 92, and utilizing the strong outward spring force of the spring sleeve and the inward retraction of the rubber sealing ring on the outer circumference, a sufficient gap of at least 0.5 mm on one side can be achieved between the workpiece and the fixture, thereby achieving the requirement of reducing the repeated positioning accuracy of the automatic loading and unloading mechanism of the workpiece, and realizing a fully automatic production line with high assembly rhythm requirements.

[0047] Using the above structure, a core rod assembly is fixed on the main bracket 3. The core rod 51 of the core rod assembly is coaxial with the main bracket 3. The core rod 51 is used to extend the axis of the main bracket 3 to the stator. During the core adjustment process, the wedge block assembly is placed between the stator and the core rod 51. The inner wedge block 71 is driven upward by the pushing cylinder to facilitate the installation of the core rod. After the core rod is installed, the pushing cylinder is moved downward. At this time, under the action of the spring, the pressure plate is pushed downward to drive the pull rod 81 to move toward the side of the pushing cylinder 82, that is, the pull rod 81 is driven downward to adjust the core, thereby realizing the coaxiality adjustment of the main bracket axis and the stator axis.

[0048] With the above structure, when the pull rod moves downward, the wedge block assembly simultaneously expands outward to clamp the stator and retracts inward to clamp the core rod, so as to ensure that the compressor stator and the rotor support main bracket are coaxial with each other and there is no positioning gap after clamping, thereby obtaining clamping positioning with high coaxiality accuracy.

[0049] With the aforementioned device, the core alignment assembly is placed on the mounting base. During installation, the core rod assembly and main support 3 are first assembled, followed by the fixture being mounted on the mounting base. The outer wedge block is then installed at the position on the fixture's upper end surface corresponding to the inner wedge block 71. The main housing 1, core rod assembly, and main support 3 are then assembled in sequence. The assembly process is simple and quick. Once assembly is complete, core alignment can begin.

[0050] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A main bracket welding internal and external expansion sleeve fixture, characterized in that: include: A core rod assembly, the core rod assembly comprising a core rod (51) and a positioning structure for fixing the core rod (51) and mounted on a main support (3) so that the axis of the core rod coincides with the axis of the main support, the positioning structure being provided with a first step structure (53) for being placed at one end of the main shell (1) and achieving axial positioning between the main shell (1) and the main support (3); A mounting seat assembly, the mounting seat assembly comprising a mounting seat (6), the mounting seat (6) being provided with a second step structure (61) for fixing the fixture (4) and a third step structure (62) for achieving axial and radial limiting of the main housing (1); A wedge block assembly, the wedge block assembly comprising at least three wedge block groups disposed circumferentially on the core rod (51), each wedge block group comprising an inner wedge block (71) and an outer wedge block (72) whose inclined surface is in close contact with the inclined surface of the inner wedge block (71) and is disposed on the end of the fixture (4); A core adjustment assembly, the core adjustment assembly is used to control all inner wedge blocks (71) to move simultaneously along the inclined surface of the outer wedge block (72), so that when the inner wedge block (71) moves toward one end of the clamp (4), the inner wedge block (71) clamps the core rod (51) while the outer wedge block (72) moves outward and closely contacts the inner diameter of the stator (2); the core adjustment assembly includes: A pull rod (81), one end of which is cylindrical and is provided with mounting holes (811) for mounting an inner wedge block (71) so that the inner side surface and the inclined surface of the inner wedge block (71) are respectively positioned on the inner and outer sides of the pull rod, and the other end is fixed with a pressure plate (812); A pushing cylinder (82), wherein the output shaft of the pushing cylinder (82) abuts against one end of the pull rod (81); A spring (83) is placed between the mounting seat (6) and the pressure plate (812) and is used to push the pull rod (81) to move toward the side of the push cylinder (82).

2. A main bracket welding internal and external expansion sleeve fixture according to claim 1, characterized in that: The positioning structure comprises a fixing seat (52), a positioning pin (54) arranged at one end of the fixing seat (52), and a connecting structure (55) for fixing the fixing seat (52) and the main bracket (3), and the first step structure (53) is arranged on the fixing seat (52).

3. The main bracket welding internal and external expansion sleeve fixture according to claim 1, characterized in that: A rotation-stopping structure for limiting the rotation of the pull rod (81) is provided between the pull rod (81) and the mounting seat (6).

4. A main bracket welding internal and external expansion sleeve fixture according to claim 3, characterized in that: The anti-rotation structure is an anti-rotation rod (93), and both the pull rod (81) and the mounting seat (6) are provided with anti-rotation holes for mounting the anti-rotation rod (93).

5. The main bracket welding internal and external expansion sleeve fixture according to claim 1, characterized in that: The pull rod is provided with limiting protrusions (813) for limiting the two ends of the inner wedge block (71). The inner wedge block (71) is placed on one side of the pull rod (81) to form at least two protrusion structures, and each protrusion structure is placed in a corresponding mounting hole (811).

6. The main bracket welding internal and external expansion sleeve fixture according to claim 1, characterized in that: The core alignment assembly further comprises a guide sleeve (84) placed at the end of the pull rod (81) and guided by the core rod (51), wherein the diameter of the guide sleeve (84) at one end away from the pull rod (81) is larger than the diameter at one end close to the pull rod (81).

7. A main bracket welding internal and external expansion sleeve fixture according to claim 1, characterized in that: An elastic member is provided on the inner side surface of the inner wedge block (71) and / or the outer side surface of the outer wedge block (72).

8. A main support welding internal and external expansion sleeve fixture according to claim 7, characterized in that: The elastic member on the inner side surface of the inner wedge-shaped block (71) is a spring sleeve (91).

9. The main support welding internal and external expansion sleeve fixture according to claim 7, characterized in that: The elastic member on the outer side surface of the outer wedge-shaped block (72) is a rubber ring (92).

Images