Fastening device for processing three-blade rotor of roots pump

Abstract

The invention discloses a fastening device for machining a lobe pump three-blade rotor, and relates to the technical field of lobe pump three-blade rotor machining devices. The three-blade rotor comprises a rotating shaft and three rotor parts arranged in the axial direction of the rotating shaft. The fastening device comprises a base, and supporting bases used for inserting the end of the rotating shaft and fixing the rotating shaft are arranged on the two sides of the upper surface of the base correspondingly. The device further comprises a measuring block provided with three reference surfaces, the middle part of the measuring block is provided with a circular hole for embedding the expansion sleeve, and the included angle between any two adjacent reference surfaces is 120 degrees. The measuring block is installed at the end of the three-blade rotor, the measuring block is provided with the three datum planes, the included angle between every two adjacent datum planes is 120 degrees, it can be guaranteed that the three-blade rotor only rotates by 120 degrees each time when the three-blade rotor is controlled to rotate, and machining of the three-blade rotor is achieved after two times of rotation are completed.

Description

Technical Field

[0001] The present invention belongs to the technical field of processing devices for three-lobe rotors of Roots pumps, and particularly relates to a fastening device for processing three-lobe rotors of Roots pumps. Background Technique

[0002] Roots pumps belong to positive displacement pumps and rely on two rotors rotating synchronously in the pump chamber to transport media. Conventional rotors have three blades or two blades; when the existing three-lobe rotors are processed and manufactured, the blanks are first forged or cast, and then turned and milled to make the general shape; finally, CNC machining centers or special rotor milling machines are used for finish machining; in the above processing process, not only the three-lobe rotors need to be fixed, but also the rotation and movement angles of the three-lobe rotors need to be controlled and then fixed again. Summary of the Invention

[0003] The purpose of the present invention is to provide a fastening device for processing three-lobe rotors of Roots pumps. By installing a measuring block at the end of the three-lobe rotor, and the measuring block has three reference planes, and the included angle between any two adjacent reference planes is 120°, it can be ensured that each rotation is only 120° when controlling the rotation of the three-lobe rotor, and the processing of the three-lobe rotor is completed after two rotations, solving the problems raised in the existing background technique.

[0004] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0005] The present invention is a fastening device for processing three-lobe rotors of Roots pumps. The three-lobe rotor includes a rotating shaft and three rotor components arranged along the axial direction of the rotating shaft; the fastening device includes a base, and on both sides of the upper surface of the base, there are respectively provided support seats for the end of the rotating shaft to be inserted and fixed to the rotating shaft; it also includes a measuring block provided with three reference planes, a circular hole for embedding an expansion sleeve is opened in the middle of the measuring block, and the included angle between any two adjacent reference planes is 120°; a support pad is cooperatively installed on the base directly below the measuring block, and lifting support structures are provided on the support pads on both sides of the rotating shaft, and the two lifting support structures extend to the same height and simultaneously abut against both sides of a reference plane.

[0006] Further, the support pad is connected and installed on the upper surface of the base through a guiding component, or connected and installed on one side of a support seat.

[0007] Further, the guiding component includes a guiding chute provided on the upper surface of the base and a guiding slider provided in the guiding chute and sliding along the length direction of the guiding chute; the top of the guiding slider is connected to the bottom side of the support pad.

[0008] Further, the guiding assembly includes a guiding rod disposed on the supporting cushion block, and a guiding hole disposed on the supporting seat and guidingly engaged with the guiding rod.

[0009] Further, the supporting seat includes a seat body mounted on the upper surface of the base, and a pressing plate mounted on the top of the seat body by bolt fit; mounting portions are provided on both sides of the bottom of the seat body, and mounting holes are formed in the mounting portions; a channel for inserting a rotating shaft is formed by the cooperation of the pressing plate and the seat body.

[0010] Further, a driving mechanism is further included, which is configured to drive the supporting cushion block to move in the axial direction of the three-lobe rotor and approach or move away from the three-lobe rotor under the action of the guiding assembly.

[0011] Further, the lifting support structure includes an adjusting bolt threadedly connected to the supporting cushion block.

[0012] Further, the lifting support structure includes a groove formed in the supporting cushion block, a resisting block abutted against the reference surface is connected in the groove through a servo telescopic motor, and a pressure sensor is mounted on the resisting block.

[0013] Further, the lifting support structure includes a screw rod and a wrench assembled on the screw rod; the screw rod penetrates through the supporting cushion block, and jacking modules fixed on the upper surface of the supporting cushion block are respectively connected to both ends of the screw rod; the jacking module includes a lower mounting seat fixed on the supporting cushion block, lower connecting rods are respectively hinged to both ends of the lower mounting seat, the end of the lower connecting rod is hinged to a hinge seat, an upper connecting rod is also hinged to the hinge seat, and the two upper connecting rods are hinged to an upper mounting seat; a top block is mounted on the upper mounting seat; a threaded hole matched with the screw rod is formed in the hinge seat; when the screw rod rotates, the two hinge seats on the jacking module approach or move away from each other.

[0014] Further, a detecting mechanism is provided on the measuring block to detect any reference surface and determine whether it is flush with the horizontal plane.

[0015] The present invention has the following beneficial effects:

[0016] In the present invention, a measuring block is installed at the end of the three-lobe rotor, and the measuring block has three reference surfaces, and the included angle between two adjacent reference surfaces is 120°. When controlling the rotation of the three-lobe rotor, it can be ensured that each rotation is only 120°, and after two rotations, the processing of the three-lobe rotor is completed. During the processing of the three-lobe rotor, the fastening device can firmly fix the workpiece on the machine tool workbench, and can ensure that the error of the surface indexing accuracy of the three lobes does not exceed 5″. The symmetry error of the three-lobe contour of the final rotor does not exceed 0.02 mm; the clearance error between the three-lobe rotors of the roots pump can be less than 0.03 mm; the excellent overall performance of the roots vacuum pump is guaranteed.

[0017] Of course, it is not necessary for any product implementing the present invention to achieve all of the above - mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of the left - hand perspective structure of the fastening device of the present invention;

[0020] Figure 2 Schematic diagram of the right - hand perspective structure of the fastening device of the present invention;

[0021] Figure 3 Schematic diagram of the lifting support structure of the present invention;

[0022] Figure 4 is Figure 3 Local enlarged view at position A in

[0023] In the drawings, the list of components represented by each reference numeral is as follows:

[0024] Base, 1; Seat body, 2; Mounting part, 21; Mounting hole, 22; Pressure plate, three - lobe rotor, 3; Bolt, 314; Support pad, 5; Measuring block, 6; Reference plane, 31; Expansion sleeve, 7; Lifting support structure, 51; Screw rod, 510; Wrench, 511; Lower mounting seat, 512; Lower connecting rod, 513; Hinge seat, 514; Upper connecting rod, 515; Upper mounting seat, 516; Top block, 517. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] Please refer to Figure 1-2As shown in the figure, the present invention is a fastening device for machining a three-lobe rotor of a Roots pump, including a base 1 and a pair of support seats arranged on the upper surface of the base 1. The support seat includes a seat body 2 installed on the upper surface of the base 1 and a pressing plate 3 installed on the top of the seat body 2 by means of bolts 31; installation parts 21 are arranged on both sides of the bottom of the seat body 2, and installation holes 22 are formed in the installation parts 21; a channel for inserting a rotating shaft is formed by the cooperation of the pressing plate 3 and the seat body 2. That is, in actual settings, the channels formed inside the two support seats are concentric structures. Therefore, when fixing, it is convenient for the two ends of the rotating shaft of the three-lobe rotor 4 to be inserted into the channels for fixing; the three-lobe rotor 4 includes a rotating shaft and three rotor components arranged along the axial direction of the rotating shaft.

[0027] During use, when machining the three-lobe rotor 4, after machining one side of the three-lobe rotor 4, it is necessary to control the rotation of the three-lobe rotor 4 and then sequentially machine the other two sides; that is, it is necessary to control the rotation of the three-lobe rotor 4 during use. That is, for the accuracy of machining during use, it is necessary to limit the three-lobe rotor 4 during use, ensure that it stops rotating after each rotation of 120°, and then fix the three-lobe rotor 4 through the support seat before machining.

[0028] That is, in the technical solution mainly focused on by the present invention, a measuring block 6 is fixed at one end of the rotating shaft, and the measuring block 6 has three reference planes 61, and the included angle between any two adjacent reference planes 61 is 120°.

[0029] To facilitate the connection between the measuring block 6 and the rotating shaft, a circular hole for embedding a expansion sleeve 7 is formed in the middle of the measuring block 6. During installation, the end of the rotating shaft is inserted into the expansion sleeve 7 for fixation.

[0030] To cooperate with the use of the measuring block 6, in order to facilitate the control of any reference plane 61 of the measuring block 6 to be in a horizontal plane during use, a support pad 5 is installed on the base 1 directly below the measuring block 6 in the actual use process. Lifting support structures 51 are arranged on the support pads 5 on both sides of the rotating shaft. The two lifting support structures 51 extend to the same height and simultaneously abut against both sides of a reference plane 61

[0031] The present invention provides the following three specific forms of the lifting support structure 51 that may be achievable:

[0032] Form 1: The lifting support structure 51 includes adjusting bolts threadedly connected to the support pad 5; during use, by controlling the adjusting bolts to the same height of the two adjusting bolts.

[0033] Form 2: The lifting support structure 51 includes a groove formed in the support pad 5. Inside the groove, a servo telescopic motor is connected to a blocking block that abuts against the reference surface 61, and a pressure sensor is installed on the blocking block. During use, by controlling the synchronous extension of the two servo telescopic motors and when both pressure sensors detect pressure signals, it is okay.

[0034] Form 3: As Figure 3-4 , the lifting support structure 51 includes a screw rod 510 and a wrench 511 assembled on the screw rod 510. The screw rod 510 penetrates through the support pad 5, and both ends are respectively connected to a jacking module fixed on the upper surface of the support pad 5. The jacking module includes a lower mounting seat 512 fixed on the support pad 5. At both ends of the lower mounting seat 512, a lower connecting rod 513 is hinged respectively. The end of the lower connecting rod 513 is hinged to a hinge seat 514. The hinge seat 514 is also hinged to an upper connecting rod 515. The two upper connecting rods 515 are hinged to an upper mounting seat 516. A top block 517 is installed on the upper mounting seat 516. A threaded hole matching the screw rod 510 is formed in the hinge seat 514. When the screw rod 510 rotates, the two hinge seats 514 on the jacking module move closer to or away from each other. During use, control the screw rod 510 to rotate until the two upper mounting seats 516 move upward synchronously and abut against the same reference surface 61. At the same time, a rectangular channel for the screw rod 510 to pass through is provided on the support pad 5. During the process of controlling the rotation of the screw rod 510, the screw rod 510 moves up and down in the rectangular channel.

[0035] Of course, during use, when controlling the rotation of the three-lobe rotor 4, in order to avoid obstruction when there is a formation blockage between the lifting support structures 51 on both sides of the support pad 5, it is necessary to control the support pad 5 to move away from below the measuring block 6. At this time, a driving mechanism is provided to drive the support pad 5 to move in the axial direction of the three-lobe rotor 4 along the guiding component, moving closer to or away from the three-lobe rotor 4. And the support pad 5 is connected and installed on the upper surface of the base 1 or on one side of a support seat through the guiding component.

[0036] In a possible technical solution, the guiding component includes a guiding chute provided on the upper surface of the base 1 and a guiding slider provided in the guiding chute and sliding along the length direction of the guiding chute. The top of the guiding slider is connected to the bottom side of the support pad 5.

[0037] In another possible technical solution, the guiding component includes a guiding rod provided on the support pad 5 and a guiding hole provided on the support seat and guidingly cooperating with the guiding rod.

[0038] Through the setting of the guiding component, it is ensured that the supporting cushion block 5 moves horizontally. When the supporting cushion block 5 extends below the measuring block 6, the gap between a reference plane 61 at the bottom of the measuring block 6 and the convex supporting surface 500 of the supporting cushion block 5 is 0.5 cm. At this time, after removing the external force that controls the rotation of the three-lobe rotor 4, the reference plane 61 of the measuring block 6 is supported on the convex supporting surface 500. Then, control the lifting support structure 51 to extend to adjust the horizontality of the reference plane 61.

[0039] The driving mechanism is selected as a horizontally installed telescopic push rod, telescopic cylinder or other mechanisms that can be connected to the supporting cushion block 5 and control its movement in the horizontal direction.

[0040] At the same time, in order to facilitate the detection of the horizontality of any reference plane of the measuring block 6 after the lifting support structure 51 extends, a detection mechanism is also included for detecting any reference plane of the measuring block 6 to determine whether it is flush with the horizontal plane.

[0041] The detection mechanism is set in three groups and is arranged on the edge side corresponding to any reference plane 61.

[0042] The detection mechanism includes spirit levels arranged at both ends of the reference plane 61; or the detection mechanism includes a slope gauge arranged on the corresponding edge side of any reference plane 61.

[0043] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A fastening device for machining a three-blade rotor of a Roots pump, characterized in that: The three-blade rotor (4) comprises a rotating shaft and three rotor components arranged axially along the rotating shaft; The fastening device comprises a base (1), and support seats for inserting the end of the rotating shaft and fixing the rotating shaft are respectively arranged on both sides of the upper surface of the base (1); It also includes a measuring block (6) provided with three reference surfaces (61), a circular hole for embedding the expansion sleeve (7) is opened in the middle of the measuring block (6), and the angle between any two adjacent reference surfaces (61) is 120°; A support pad (5) is mounted on the base (1) directly below the measuring block (6), and lifting support structures (51) are arranged on the support pads (5) on both sides of the rotating shaft. The two lifting support structures (51) extend to the same height and abut against both sides of a reference surface (61) at the same time.

2. A fastening device for machining a three-blade rotor of a Roots pump according to claim 1, characterized in that: The support pad (5) is connected and installed on the upper surface of the base (1) through a guide assembly, or is connected and installed on one side of a support seat.

3. A fastening device for machining a three-blade rotor of a Roots pump according to claim 2, characterized in that: The guide assembly comprises a guide slot arranged on the upper surface of the base (1), and a guide slider arranged in the guide slot and sliding along the length direction of the guide slot; the top of the guide slider is connected to the bottom side of the support pad (5).

4. A fastening device for machining a three-blade rotor of a Roots pump according to claim 2, characterized in that: The guide assembly comprises a guide rod arranged on the support pad (5), and a guide hole arranged on the support seat and cooperating with the guide rod for guidance.

5. A fastening device for machining a three-blade rotor of a Roots pump according to any one of claims 1 to 4, characterized in that: The support seat comprises a seat body (2) mounted on the upper surface of the base (1), and a pressure plate (3) mounted on the top of the seat body (2) by means of bolts (31); Mounting parts (21) are arranged on both sides of the bottom of the seat body (2), and mounting holes (22) are opened on the mounting parts (21); The pressing plate (3) and the seat body (2) cooperate to form a channel for inserting the rotating shaft.

6. A fastening device for machining a three-blade rotor of a Roots pump according to claim 3 or 4, characterized in that: It also comprises a driving mechanism provided with a driving support pad (5) which moves along the axial direction of the three-blade rotor (4) towards or away from the three-blade rotor (4) under the action of the guide assembly.

7. A fastening device for machining a three-blade rotor of a Roots pump according to any one of claims 1 to 4, characterized in that: The lifting support structure (51) comprises an adjusting bolt threadedly connected to the supporting pad (5).

8. A fastening device for machining a three-blade rotor of a Roots pump according to any one of claims 1 to 4, characterized in that: The lifting support structure (51) comprises a groove formed on the support pad (5), a stop block abutting against a reference surface (61) is connected in the groove via a servo telescopic motor, and a pressure sensor is mounted on the stop block.

9. A fastening device for machining a three-blade rotor of a Roots pump according to any one of claim 2, characterized in that: The lifting support structure (51) comprises a screw rod (510) and a wrench (511) assembled on the screw rod (510); The screw rod (510) passes through the support pad (5), and both ends are respectively connected to a lifting module fixed on the upper surface of the support pad (5); The lifting module comprises a lower mounting seat (512) fixed on the supporting cushion block (5), the two ends of the lower mounting seat (512) are respectively hinged to a lower connecting rod (513), the end of the lower connecting rod (513) is hinged to a hinge seat (514), the hinge seat (514) is also hinged to an upper connecting rod (515), and the two upper connecting rods (515) are hinged to an upper mounting seat (516); a lifting block (517) is installed on the upper mounting seat (516); The hinge seat (514) is provided with a threaded hole that matches the screw rod (510); when the screw rod (510) rotates, the two hinge seats (514) on the lifting module move closer to or farther away from each other.

10. A fastening device for machining a three-blade rotor of a Roots pump according to claim 1, characterized in that: The measuring block (6) is provided with a detection mechanism for detecting any reference surface to determine whether it is flush with the horizontal surface.

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