High-precision compressor crankcase machining positioning device

Abstract

The utility model relates to a kind of high-precision compressor crankcase machining positioning device.It solves the problem of insufficient positioning accuracy and supporting force when the crankcase bearing is pressed in the prior art.It includes positioning base, positioning base is provided with crankcase support base, positioning base upper end surface and located crankcase support base circumferential arrangement has several lifting control structures, and lifting control structure upper end is connected with the compression assembly for positioning the upper end of crankcase, crankcase support base is provided with several plug-in positioning structure and support pedestal structure acting on crankcase, crankcase support base middle part is equipped with shaft center positioning assembly.The utility model has the advantages of high positioning accuracy and good supporting force, which can effectively improve the bearing pressing quality.

Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment technology, specifically to a high-precision crankcase machining and positioning device for compressors. Background Technology

[0002] Engine manufacturers typically press-fit crankcase bearings using the following method: First, the crankcase is placed on a workbench with the bearing mounting surface facing upwards. Then, the bearing is installed into the crankcase, positioned at the crankshaft bore opening. Next, a shaft is used to hold the bearing in place, and the upper end of the shaft is tapped with a tool to press the bearing onto the mounting surface. In this method, the bearing is primarily stressed by its inner ring, making it prone to deformation and compromising its lifespan. Manual tapping results in uneven bearing stress, leading to unevenness or misalignment, making it difficult to ensure concentricity between the bearing and the crankshaft bore. This results in poor press-fit quality and low efficiency. Furthermore, current crankcase machining methods often lack sufficient positioning accuracy and support strength, which can affect bearing installation accuracy and assembly results.

[0003] To address the shortcomings of existing technologies, people have conducted long-term explorations and proposed various solutions. For example, Chinese patent literature discloses a crankcase bearing press-fitting fixture [CN201210529783.3], which includes a support base fixed on a base plate, on which an annular boss is integrally formed. The center of the annular boss extends upward to form a positioning shaft. An annular groove is formed on the top surface of the annular boss, which surrounds the outer circle of the positioning shaft. A pressure head is provided above the support base. The lower end of the pressure head has a guide groove adapted to the positioning shaft, and a pressure plate is provided on the edge of the bottom surface of the pressure head.

[0004] The above solution has solved the problem of poor quality and low efficiency of manual press-fitting of crankcase bearings in the existing technology to a certain extent. However, the solution still has many shortcomings, such as insufficient positioning accuracy and support force, which can easily affect the installation accuracy and assembly effect of the bearing. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a high-precision crankcase machining and positioning device for compressors.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a high-precision crankcase machining and positioning device for a compressor, comprising a positioning base, a crankcase support base disposed on the positioning base, a plurality of lifting control structures arranged on the upper end face of the positioning base and circumferentially located on the crankcase support base, and a clamping component for positioning the upper end of the lifting control structure connected to the upper end of the crankcase, a plurality of plug-in positioning structures acting on the crankcase and a support platform structure disposed on the crankcase support base, and a crankcase support base outer circle positioning component disposed in the middle of the crankcase support base.

[0007] In the aforementioned high-precision crankcase machining and positioning device for compressors, the lifting control structure includes a fixed connecting seat mounted on the positioning base, a clamping cylinder mounted on the upper end of the fixed connecting seat, and the output end of the clamping cylinder connected to one end of the aforementioned clamping assembly.

[0008] In the above-mentioned high-precision crankcase machining and positioning device for compressors, the clamping assembly includes a clamping block. One end of the clamping block has a connecting positioning hole for connecting the output end of the clamping cylinder. The output end of the clamping cylinder passes through the connecting positioning hole and is fixed by a limiting nut set on the upper end face of the clamping block.

[0009] In the aforementioned high-precision crankcase machining and positioning device for compressors, the lower side of the end of the clamping block away from the connecting positioning hole has a clamping relief groove, the upper surface of the clamping relief groove is the clamping surface and the side adjacent to the clamping surface is the relief surface.

[0010] In the aforementioned high-precision crankcase machining and positioning device for compressors, the end of the clamping block away from the connecting positioning hole has an arc-shaped clamping relief portion.

[0011] In the aforementioned high-precision crankcase machining and positioning device for compressors, the crankcase support base is provided with several fixing and mounting holes for fixing and connecting the plug-in positioning structure and the support pedestal structure. The crankcase support base is also provided with fixing and connecting holes for connecting the positioning base. The bottom of the crankcase support base is provided with a chip removal channel, and one end of the crankcase support base is provided with a fastening screw clearance groove. The positioning base is provided with mounting holes corresponding to the fastening screw clearance groove.

[0012] In the aforementioned high-precision crankcase machining and positioning device for compressors, the plug-in positioning structure includes a plug-in fixing seat. The plug-in fixing seat is provided with several positioning connection holes corresponding to the fixing installation holes. The upper end of the plug-in fixing seat is provided with a positioning pin that is plugged into the positioning hole of the crankcase. The bottom of the positioning pin extends toward the bottom of the plug-in fixing seat and is positioned secondary through the plug-in positioning hole provided on the crankcase support base.

[0013] In the aforementioned high-precision crankcase machining and positioning device for compressors, the support platform structure includes a support platform body, with connecting lugs on both sides of the support platform body, fixing holes corresponding to the fixing mounting holes on the connecting lugs, and a support platform between the connecting lugs.

[0014] In the aforementioned high-precision crankcase machining and positioning device for a compressor, the crankcase outer circle positioning component includes a central threaded hole located in the middle of the crankcase support base. A threaded positioning rod is internally threaded into the central threaded hole, and a rotating adjustment ring is fixedly installed on the outer side of the threaded positioning rod and at the upper end of the crankcase support base.

[0015] In the aforementioned high-precision crankcase machining and positioning device for compressors, the lower end of the threaded positioning rod is rotatably positioned in the threaded hole of the shaft, and the other end extends upward to form an insertion positioning with the crankcase shaft.

[0016] Compared with the prior art, the advantages of this utility model are as follows: the pressing assembly applies uniform pressure to the upper end of the crankcase through the double contact of the pressing surface and the relief surface, while the positioning pin of the plug-in positioning structure penetrates into the positioning hole of the crankcase to achieve secondary positioning, thereby achieving synchronous positioning of the upper and lower ends and improving positioning accuracy; secondly, through the combination of the threaded positioning rod and the rotating adjusting ring, the extension length of the threaded positioning rod can be precisely adjusted by manually rotating the adjusting ring, so that its top end fits tightly with the crankcase shaft hole, thereby achieving positioning of the bearing to be pressed in; and the support base structure can position the sinking part of the crankcase, preventing the crankcase from sinking during the pressing of the bearing and improving the assembly quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the crankcase in this utility model;

[0018] Figure 2 This is a schematic diagram of the pressing block structure in this utility model;

[0019] Figure 3 This is a schematic diagram of the crankcase support base structure in this utility model;

[0020] Figure 4 This is a schematic diagram of the plug-in positioning structure in this utility model;

[0021] Figure 5 This is a schematic diagram of the support pedestal structure in this utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the outer circle positioning component of the shaft platform in this utility model;

[0023] In the diagram: 1. Positioning base; 11. Mounting hole; 2. Crankcase support base; 21. Fixed mounting hole; 22. Fixed connection hole; 23. Chip removal channel; 24. Fastening screw clearance groove; 3. Lifting control structure; 3. Fixed connection seat; 31. Pressing cylinder; 32. Pressing assembly; 4. Pressing block; 41. Connecting positioning hole; 42. Pressing clearance groove; 421. Pressing surface; 422. Clearance surface; 423. Pressing clearance part; 424. Limiting nut; 5. Plug-in positioning structure; 5. Plug-in fixed seat; 51. Positioning connection hole; 52. Positioning pin; 53. Plug-in positioning hole; 54. Support platform structure; 6. Support platform body; 61. Connecting lug; 62. Positioning hole; 63. Support platform surface; 64. Shaft platform outer circle positioning assembly; 7. Shaft threaded hole; 71. Threaded positioning rod; 72. Rotation adjustment ring; 73. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1-6 As shown, a high-precision crankcase machining and positioning device for a compressor includes a positioning base 1, a crankcase support base 2 on the positioning base 1, a plurality of lifting control structures 3 arranged on the upper surface of the positioning base 1 and circumferentially on the crankcase support base 2, and a clamping component 4 for positioning the upper end of the crankcase connected to the upper end of the lifting control structure 3. A plurality of plug-in positioning structures 5 acting on the crankcase and a support platform structure 6 are provided on the crankcase support base 2, and a crankcase support base outer circle positioning component 7 is provided in the middle of the crankcase support base 2.

[0026] The lifting control structure 3 includes a fixed connecting seat 31 set on the positioning base 1. A pressing cylinder 32 is set on the upper end of the fixed connecting seat 31, and the output end of the pressing cylinder 32 is connected to one end of the pressing component 4.

[0027] The clamping cylinder 32 drives the clamping assembly 4 connected to the upper end to lift and lower by extending and retracting the output end, thereby controlling the clamping / releasing action.

[0028] As can be seen, the clamping assembly 4 includes a clamping block 41. One end of the clamping block 41 has a connection positioning hole 42 for connecting the output end of the clamping cylinder 32. The output end of the clamping cylinder 32 passes through the connection positioning hole 42 and is fixed by a limiting nut 43 provided on the upper end face of the clamping block 41.

[0029] The pressing surface 422 of the pressing relief groove 421 directly contacts the upper end face of the crankcase, and longitudinal pressing is achieved by the driving force of the pressing cylinder 32; the adjacent relief surface 423 assists in fitting the side of the crankcase, further restricting its circumferential rotation and improving the overall positioning stability.

[0030] Obviously, the lower side of the end of the clamping block 41 away from the connecting positioning hole 42 has a clamping relief groove 421, the upper surface of the clamping relief groove 421 is the clamping surface 422, and the side adjacent to the clamping surface 422 is the relief surface 423.

[0031] The clamping clearance groove 421 and clamping clearance part 424 at the end of the clamping block 41 away from the connecting positioning hole 42 are used to avoid local structures such as protrusions and ribs at the upper end of the crankcase, so as to avoid interference with the crankcase during clamping.

[0032] Furthermore, the end of the clamping block 41 away from the connecting positioning hole 42 has an arc-shaped clamping relief portion 424.

[0033] Specifically, the crankcase support base 2 is provided with a number of fixing mounting holes 21 for fixing and connecting the plug-in positioning structure 5 and the support base structure 6, and the crankcase support base 2 is also provided with fixing connection holes 22 for connecting the positioning base 1. The bottom of the crankcase support base 2 is provided with a chip removal channel 23, and one end of the crankcase support base 2 is provided with a fastening screw clearance groove 24. The positioning base 1 is provided with mounting holes 11 corresponding to the fastening screw clearance groove 24.

[0034] A locking screw is provided in the fixed connection hole 22 for connecting the positioning base 1. Then, the crankcase support base 2 is fixed to the positioning base 1 through the fastening hole and the pin hole, and the mounting hole 11 is used to fix it to the positioning base 1.

[0035] Furthermore, the plug-in positioning structure 5 includes a plug-in fixing seat 51, which has several positioning connection holes 52 corresponding to the fixing mounting holes 21. The upper end of the plug-in fixing seat 51 is provided with a positioning pin 53 that is inserted into the crankcase positioning hole. The bottom of the positioning pin 53 extends toward the bottom of the plug-in fixing seat 51 and is positioned secondary through the plug-in positioning hole 54 provided on the crankcase support base 2.

[0036] The positioning pin 53 is inserted into the pre-set alignment hole of the crankcase to achieve the positioning of the crankcase relative to the radial specific hole position of the support base; secondly, the bottom of the positioning pin 53 extends to the insertion positioning hole 54 of the crankcase support base 2, and the coaxiality and stability of the positioning pin 53 are further improved through secondary positioning to avoid crankcase hole position deviation caused by the offset of the positioning pin 53.

[0037] More specifically, the support pedestal structure 6 includes a support pedestal body 61, with connecting lugs 62 on both sides of the support pedestal body 61, fixing holes 63 corresponding to the fixing mounting holes 21 on the connecting lugs 62, and a support platform 64 between the connecting lugs 62.

[0038] The crankcase support 2 is fixed to the positioning base 1 by two pins and fastening screws, which ultimately restricts the movement of the crankcase support 2 in the X and Y directions during machining, and avoids displacement from affecting accuracy.

[0039] Meanwhile, the fixed mounting hole 21 of the crankcase support base 2 provides a unified installation interface for the plug-in positioning structure 5 and the support base structure 6, and the chip removal channel 23 is used for chip removal during processing.

[0040] In detail, the crankcase outer circle positioning assembly 7 includes a shaft threaded hole 71 located in the middle of the crankcase support base 2, a threaded positioning rod 72 is internally threaded into the shaft threaded hole 71, and a rotation adjustment ring 73 is fixedly installed on the upper end of the crankcase support base 2 with the threaded positioning rod 72 circumferentially outward.

[0041] By rotating the outermost rotating adjusting ring 73, the extension height of the threaded positioning rod 72 can be precisely adjusted to achieve positioning of bearings at different heights.

[0042] Preferably, the lower end of the threaded positioning rod 72 is rotatably positioned in the threaded hole 71 of the shaft center, and the other end extends upward to form an insertion positioning with the crankcase shaft center.

[0043] In summary, the principle of this embodiment is as follows: the crankcase support base 2 is limited by the locking screw and two pin holes of the fixed connection hole 22; the support platform structure 6 supports the sinking part of the bottom of the crankcase to avoid sinking under pressure when pressing the bearing; the plug-in positioning structure 5 realizes the local hole positioning of the crankcase; the outer circle positioning component 7 of the shaft platform ensures the coaxiality of the shaft center; the pressing cylinder 32 of the lifting control structure 3 drives the pressing component 4 to fix the upper end of the crankcase, thereby realizing the high-precision positioning of the crankcase when pressing the bearing.

[0044] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0045] Although this article uses a lot of terms such as positioning base 1, mounting hole 11, crankcase support base 2, fixed mounting hole 21, fixed connection hole 22, chip removal channel 23, fastening screw clearance groove 24, lifting control structure 3, fixed connection seat 31, clamping cylinder 32, clamping assembly 4, clamping block 41, connecting positioning hole 42, clamping clearance groove 421, clamping surface 422, clearance surface 423, clamping clearance part 424, limit nut 43, plug-in positioning structure 5, plug-in fixed seat 51, positioning connection hole 52, positioning pin 53, plug-in positioning hole 54, support platform structure 6, support platform body 61, connecting lug 62, positioning hole 63, support platform surface 64, shaft platform outer circle positioning assembly 7, shaft threaded hole 71, threaded positioning rod 72, rotation adjustment ring body 73, etc., the possibility of using other terms cannot be excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would be contrary to the spirit of this utility model.

Claims

1. A high-precision crankcase machining and positioning device for a compressor, comprising a positioning base (1), wherein a crankcase support base (2) is provided on the positioning base (1), characterized in that, The positioning base (1) has several lifting control structures (3) arranged around the crankcase support base (2) on its upper surface. The upper end of the lifting control structure (3) is connected to a clamping component (4) for positioning the upper end of the crankcase. The crankcase support base (2) is provided with several plug-in positioning structures (5) and a support platform structure (6) that act on the crankcase. The crankcase support base (2) is provided with a shaft platform outer circle positioning component (7) in the middle. The lifting control structure (3) includes a fixed connecting seat (31) set on the positioning base (1). The upper end of the fixed connecting seat (31) is provided with a clamping cylinder (32). 32) The output end is connected to one end of the above-mentioned clamping assembly (4); the clamping assembly (4) includes a clamping block (41), one end of the clamping block (41) has a connecting positioning hole (42) for connecting the output end of the clamping cylinder (32), and the output end of the clamping cylinder (32) passes through the connecting positioning hole (42) and is fixed by a limiting nut (43) set on the upper end surface of the clamping block (41); the lower side of the end of the clamping block (41) away from the connecting positioning hole (42) has a clamping relief groove (421), the upper end surface of the clamping relief groove (421) is the clamping surface (422) and the side adjacent to the clamping surface (422) is the relief surface (423).

2. The high-precision crankcase machining and positioning device for a compressor according to claim 1, characterized in that, The clamping block (41) has an arc-shaped clamping relief portion (424) at the end away from the connecting positioning hole (42).

3. The high-precision crankcase machining and positioning device for a compressor according to claim 2, characterized in that, The crankcase support base (2) is provided with several fixing holes (21) for fixing and connecting the plug-in positioning structure (5) and the support base structure (6). The crankcase support base (2) is also provided with fixing holes (22) for connecting the positioning base (1). The bottom of the crankcase support base (2) is provided with a chip removal channel (23). One end of the crankcase support base (2) is provided with a fastening screw clearance groove (24). The positioning base (1) is provided with mounting holes (11) corresponding to the fastening screw clearance groove (24).

4. The high-precision crankcase machining and positioning device for a compressor according to claim 3, characterized in that, The plug-in positioning structure (5) includes a plug-in fixing seat (51). The plug-in fixing seat (51) is provided with a plurality of positioning connection holes (52) corresponding to the fixing mounting holes (21). The upper end of the plug-in fixing seat (51) is provided with a positioning pin (53) that is inserted into the positioning hole of the crankcase. The bottom of the positioning pin (53) extends toward the bottom of the plug-in fixing seat (51) and is positioned twice through the plug-in positioning hole (54) provided on the crankcase support base (2).

5. The high-precision crankcase machining and positioning device for a compressor according to claim 4, characterized in that, The support base structure (6) includes a support base body (61), the support base body (61) has connecting ears (62) on both sides, the connecting ears (62) have fixing holes (63) corresponding to the fixing mounting holes (21), and the connecting ears (62) have a support platform (64) between them.

6. The high-precision crankcase machining and positioning device for a compressor according to claim 5, characterized in that, The aforementioned axle platform outer circle positioning assembly (7) includes a shaft threaded hole (71) located in the middle of the crankcase support base (2). The shaft threaded hole (71) is internally threaded with a threaded positioning rod (72), and a rotating adjustment ring (73) is fixedly installed on the outer side of the threaded positioning rod (72) and located at the upper end of the crankcase support base (2).

7. A high-precision crankcase machining and positioning device for a compressor according to claim 6, characterized in that, The lower end of the threaded positioning rod (72) is rotatably positioned in the threaded hole (71) of the shaft center, and the other end extends upward and forms an insertion positioning with the crankcase shaft center.

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