Shaft seal end cover clamp of screw vacuum pump

Abstract

The utility model provides a shaft seal end cover clamp of a screw vacuum pump, and relates to the technical field of shaft seal end cover machining clamps of screw vacuum pumps, the shaft seal end cover clamp of the screw vacuum pump comprises an adjusting base, two positioning and fixing assemblies and a limiting and fixing assembly, the two positioning and fixing assemblies are used for positioning and fixing the large end face of a shaft seal end cover body; a driving shaft is rotationally mounted in the driving platform, limiting and fixing assemblies are mounted at the four corners of the top of the driving platform, and the four limiting and fixing assemblies are movably connected with the mounting frame and used for limiting and fixing a flange at the upper end of a shaft hole of the shaft seal end cover body; the shaft seal end cover body is jointly clamped and fixed through the positioning and fixing assembly and the limiting and fixing assembly, the problem of poor stability caused by single clamping and fixing can be avoided, the height, protruding out of the shaft hole, of the limiting and fixing assembly is small, punching operation is not affected, and then the clamping stability of the doctor clamp can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of a shaft seal end cover processing fixture for a screw vacuum pump, in particular to a shaft seal end cover fixture for a screw vacuum pump. Background Art

[0002] The hole on the large end face of the shaft seal end cap of the screw vacuum pump is the large end face mounting hole, and the hole on the flange of the shaft hole is the shaft flange mounting hole. When drilling holes, it is necessary to use a matching clamp to clamp and fix them before the subsequent drilling operation can be carried out. The structure of the existing clamp is as follows: a sliding clamp is set on the workbench around the edge of the large end face to clamp and fix the edge. A shaft positioning column is set in the circle of this sliding clamp to cooperate with the shaft hole to position the shaft seal end cap. The shaft positioning column extends out of the shaft hole. When processing the large end face mounting hole, a long drill bit needs to be installed on the drilling rotary head, otherwise the drilling rotary head will have a contact effect with the shaft positioning column. The use of a long drill bit to drill holes will reduce stability, and the drill bit is easily twisted due to force, affecting the drilling operation.

[0003] In order to solve the above problems, Chinese patent CN 219074956 U discloses a shaft seal end cap clamp for a screw vacuum pump, comprising a pair of axial telescopic positioning parts and a pair of sliding jaws respectively movably arranged on a workbench; the axial telescopic positioning part axially cooperates with the shaft hole of the shaft seal end cap to position the shaft seal end cap; the pair of sliding jaws slide towards each other to clamp the edge of the large end face of the shaft seal end cap to fix the shaft seal end cap; the axial telescopic positioning part can be axially telescopic relative to the shaft hole to enter and exit the shaft hole. While the sliding jaws are used to ensure stable clamping of the shaft seal end cap, the axial telescopic positioning part is retracted into the shaft hole when processing the large end face mounting hole, so as to avoid collision between the punching rotating head and the axial telescopic positioning part to affect the punching operation. Although the above patent provides an axial telescopic positioning part that can be axially telescopic relative to the shaft hole and enter and exit the shaft hole, so that the axial telescopic positioning part does not interfere with the drilling operation, the entire structure has a single clamping and fixing form for the shaft seal end cover. When the axial telescopic positioning part is retracted into the shaft hole, the axial telescopic positioning part does not fix the shaft seal end cover, but only plays a certain positioning role, resulting in the clamping stability of the shaft seal end cover being affected. Therefore, the utility model proposes a shaft seal end cover clamp for a screw vacuum pump to solve the deficiencies in the prior art. Utility Model Content

[0004] In view of the above problems, the purpose of the utility model is to provide a shaft seal end cover clamp for a screw vacuum pump. By arranging a positioning fixing component and a limit fixing component to jointly clamp and fix the shaft seal end cover body, the problem of poor stability caused by a single clamping and fixing can be avoided. The height of the limit fixing component protruding from the shaft hole is small and does not affect the drilling operation, thereby effectively improving the clamping stability of the doctor clamp.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A shaft seal end cover fixture of a screw vacuum pump comprises an adjusting base, a positioning and fixing assembly and a limit fixing assembly, wherein a stand is symmetrically arranged on the top of the adjusting base, a positioning and fixing assembly is installed on one side of the stand, two groups of the positioning and fixing assemblies are used to position and fix the large end surface of the shaft seal end cover body, a spacing adjustment mechanism is installed inside the adjusting base, a moving seat is symmetrically installed on the spacing adjustment mechanism, a lifting cylinder is provided above the moving seat, a driving platform is installed at the output end of the lifting cylinder, a driving shaft is rotatably installed inside the driving platform, the driving shaft is driven by a driving motor, the upper end of the driving shaft extends out of the top of the driving platform and is installed with a mounting frame, and limited fixing assemblies are installed at the four corners of the top of the driving platform, four groups of the limit fixing assemblies are movably connected to the mounting frame, and the four groups of the limit fixing assemblies are used to limit and fix the flange at the upper end of the shaft hole of the shaft seal end cover body, and the diameter of the upper end of the moving seat is adapted to the inner diameter of the shaft hole;

[0007] The limiting and fixing assembly includes a guide seat, a movable limiting arm and a limiting arc plate. The guide seats are installed at the four corners of the top of the driving platform. A movable limiting arm is slidably provided in the guide seat. One end of the movable limiting arm is movably connected to the mounting frame. A limiting arc plate is installed below one end of the movable limiting arm.

[0008] A further improvement is that the positioning and fixing assembly includes a positioning cylinder, a connecting seat and a positioning clamping plate, the positioning cylinder is installed on one side of the stand, the connecting seat is installed on the output end of the positioning cylinder, and the positioning clamping plate is detachably installed on one side of the connecting seat by bolts.

[0009] A further improvement is that the inner side surface of the positioning clamp plate is a curved surface structure, and an anti-slip pad is provided on the curved surface structure of the inner side surface of the positioning clamp plate.

[0010] Further improvement is that: the spacing adjustment mechanism includes a bidirectional screw, a through slot and a servo motor, a bidirectional screw is rotatably installed inside the adjustment base, a through slot communicating with the cavity is provided at the bottom of the adjustment base, the movable seat is slidably connected to the through slot, and the lower end of the movable seat is threadedly connected to the bidirectional screw, and the bidirectional screw is driven by a servo motor.

[0011] A further improvement is that: movable grooves are provided on the four supporting arms of the mounting frame, and the upper part of one end of the movable limiting arm is movably connected to the movable groove through a connecting rod.

[0012] A further improvement is that the driving platform is a circular platform, and the diameter of the driving platform is smaller than the diameter of the shaft hole of the shaft seal end cover body.

[0013] The beneficial effects of the utility model are as follows: the utility model can avoid the problem of poor stability caused by single clamping and fixing by setting a positioning and fixing component and a limiting and fixing component to clamp and fix the shaft seal end cover body, and the limiting and fixing component of the utility model is installed on a movable seat driven by a spacing adjustment mechanism, so that the clamp of the utility model can adapt to the clamping and fixing of shaft seal end cover bodies of different sizes; the clamp of the utility model can position the shaft seal end cover body through the upper end of the movable seat adapted to the inner diameter of the shaft hole, and can limit and press the inner edge of the flange at the upper end of the shaft hole of the shaft seal end cover body through the limiting and fixing component on the driving platform installed on the output end of the lifting cylinder on the top of the movable seat. The height of the limiting and fixing component protruding from the shaft hole is small, which does not affect the drilling operation, and can effectively improve the clamping stability of the doctor clamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0015] Figure 2 It is a top view schematic diagram of the structure of the utility model (only one set of limit fixing components is shown);

[0016] Figure 3 It is a top view schematic diagram of the installation structure of the limit fixing component of the utility model;

[0017] Figure 4 It is a schematic front view of the installation structure of the limiting fixing component of the utility model.

[0018] Wherein: 1. Adjusting base; 2. Positioning and fixing assembly; 201. Positioning cylinder; 202. Connecting seat; 203. Positioning splint; 204. Anti-skid pad; 3. Limiting and fixing assembly; 301. Guide seat; 302. Movable limiting arm; 303. Limiting arc plate; 4. Stand; 5. Shaft seal end cover body; 501. Large end face; 502. Flange; 503. Shaft hole; 6. Spacing adjustment mechanism; 601. Bidirectional screw rod; 602. Through slot; 603. Servo motor; 7. Moving seat; 8. Lifting cylinder; 9. Driving platform; 10. Driving shaft; 11. Driving motor; 12. Mounting frame; 13. Moving slot; 14. Connecting rod. DETAILED DESCRIPTION

[0019] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with an embodiment. The embodiment is only used to explain the present invention and does not constitute a limitation on the protection scope of the present invention.

[0020] according to Figure 1-4As shown, this embodiment proposes a shaft seal end cover fixture of a screw vacuum pump, including an adjustment base 1, a positioning and fixing component 2 and a limit fixing component 3. A stand 4 is symmetrically arranged on the top of the adjustment base 1, and a positioning and fixing component 2 is installed on one side of the stand 4. Two groups of the positioning and fixing components 2 are used to position and fix the large end surface 501 of the shaft seal end cover body 5. A spacing adjustment mechanism 6 is installed inside the adjustment base 1, and a moving seat 7 is symmetrically installed on the spacing adjustment mechanism 6. A lifting cylinder 8 is provided above the moving seat 7, and a driving platform 9 is installed at the output end of the lifting cylinder 8. A driving shaft 10 is rotatably installed inside the driving platform 9, and the driving shaft 10 is driven by a driving motor 11. The upper end of the driving shaft 10 extends out of the driving platform 9. A mounting frame 12 is installed on the top, and limited fixing components 3 are installed at the four corners of the top of the driving platform 9. The four groups of limited fixing components 3 are all movably connected to the mounting frame 12, and the four groups of limited fixing components 3 are used to limit and fix the flange 502 at the upper end of the shaft hole 503 of the shaft seal end cover body 5, and the upper end diameter of the movable seat 7 is adapted to the inner diameter of the shaft hole 503; the limited fixing component 3 includes a guide seat 301, a movable limiting arm 302 and a limiting arc plate 303. The guide seat 301 is installed at the four corners of the top of the driving platform 9, and a movable limiting arm 302 is slidably provided in the guide seat 301. One end of the movable limiting arm 302 is movably connected to the mounting frame 12, and a limited arc plate 303 is installed below one end of the movable limiting arm 302.

[0021] When the shaft seal end cap clamp of the screw vacuum pump of the present invention clamps and fixes the shaft seal end cap body 5, firstly, the positions of the two movable seats 7 on the spacing adjustment mechanism 6 are adjusted according to the distance between the two shaft holes 503 of the shaft seal end cap body 5, so that the upper end of the movable seat 7 and the shaft hole 503 can be adapted to be connected, and after the adjustment, the two shaft holes 503 of the shaft seal end cap body 5 are passed through the movable seat 7, so that the entire shaft seal end cap body 5 is placed above the adjustment base 1, and at this time, the shaft seal end cap body 5 is positioned only by the upper end of the movable seat 7, and then the positioning and fixing component 2 is used to clamp the two sides of the large end surface 501 of the shaft seal end cap body 5 The lifting cylinder 8 is controlled to extend to drive the limit fixing component 3 to extend out of the upper end of the shaft hole 503, and then the driving motor 11 is started to drive the driving shaft 10 to rotate. When the driving shaft 10 rotates, the mounting frame 12 installed on the driving shaft 10 is deflected at an angle, and then the moving limit arm 302 is controlled to slide outward on the guide seat 301 through the moving groove 13 and the connecting rod 14. When the limit arc plate 303 is attached to the inner wall of the shaft hole 503, the driving motor 11 is stopped. At this time, the output end of the lifting cylinder 8 is controlled to retract until the bottom of one end of the moving limit arm 302 contacts the top of the flange 502, and the limit fixation is completed.

[0022] The positioning and fixing assembly 2 includes a positioning cylinder 201, a connecting seat 202 and a positioning clamping plate 203. The positioning cylinder 201 is installed on one side of the stand 4, and the connecting seat 202 is installed on the output end of the positioning cylinder 201. The positioning clamping plate 203 is detachably installed on one side of the connecting seat 202 through bolts. The inner side surface of the positioning clamping plate 203 is a curved surface structure, and an anti-skid pad 204 is provided on the curved surface structure of the inner side surface of the positioning clamping plate 203. The positioning clamping plate 203 of the utility model can be replaced according to the size of the large end surface 501 of the shaft seal end cover body 5, and the provision of the anti-skid pad 204 can improve the fixing and clamping stability of the positioning and fixing assembly 2.

[0023] The spacing adjustment mechanism 6 includes a bidirectional screw 601, a through slot 602 and a servo motor 603. The bidirectional screw 601 is rotatably installed inside the adjustment base 1. The bottom of the adjustment base 1 is provided with a through slot 602 communicating with the cavity. The moving seat 7 is slidably connected with the through slot 602, and the lower end of the moving seat 7 is threadedly connected with the bidirectional screw 601. The bidirectional screw 601 is driven by the servo motor 603. By starting the servo motor 603 to drive the bidirectional screw 601 to rotate, the moving seat 7 slides in the through slot 602 and moves on the bidirectional screw 601 synchronously to achieve spacing adjustment.

[0024] The four arms of the mounting frame 12 are provided with moving grooves 13 , and the upper part of one end of the moving limiting arm 302 is movably connected to the moving groove 13 through a connecting rod 14 .

[0025] The driving platform 9 is a circular platform, and the diameter of the driving platform 9 is smaller than the diameter of the shaft hole 503 of the shaft seal end cover body 5 .

[0026] The utility model provides a positioning and fixing component 2 and a limiting and fixing component 3 to clamp and fix the shaft seal end cover body 5 together, which can avoid the problem of poor stability caused by a single clamping and fixing. The limiting and fixing component 3 of the utility model is installed on a movable seat 7 driven by a spacing adjustment mechanism 6, so that the clamp of the utility model can adapt to the clamping and fixing of shaft seal end cover bodies 5 of different sizes; the clamp of the utility model can position the shaft seal end cover body 5 through the upper end of the movable seat 7 adapted to the inner diameter of the shaft hole 503, and can also limit and press the inner edge of the flange 502 at the upper end of the shaft hole 503 of the shaft seal end cover body 5 through the limiting and fixing component 3 on the driving platform 9 installed at the output end of the lifting cylinder 8 on the top of the movable seat 7. The height of the limiting and fixing component 3 protruding from the shaft hole 503 is small, which does not affect the drilling operation, and thus can effectively improve the clamping stability of the doctor clamp.

[0027] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A shaft seal end cap fixture for a screw vacuum pump, characterized in that: The invention comprises an adjusting base (1), a positioning and fixing component (2) and a limiting and fixing component (3), wherein a stand (4) is symmetrically arranged on the top of the adjusting base (1), a positioning and fixing component (2) is installed on one side of the stand (4), and two groups of the positioning and fixing components (2) are used to position and fix the large end surface (501) of the shaft seal end cover body (5), a spacing adjustment mechanism (6) is installed inside the adjusting base (1), a moving seat (7) is symmetrically installed on the spacing adjustment mechanism (6), a lifting cylinder (8) is installed above the moving seat (7), a driving platform (9) is installed on the output end of the lifting cylinder (8), and the driving platform (9) is installed on the output end of the lifting cylinder (8). A driving shaft (10) is rotatably mounted inside the moving platform (9), the driving shaft (10) being driven by a driving motor (11), the upper end of the driving shaft (10) extending out of the top of the driving platform (9) and being mounted with a mounting frame (12), limited position fixing components (3) being mounted at the four corners of the top of the driving platform (9), four groups of limited position fixing components (3) being movably connected to the mounting frame (12), and the four groups of limited position fixing components (3) being used to limit and fix the flange (502) at the upper end of the shaft hole (503) of the shaft seal end cover body (5), and the upper end diameter of the moving seat (7) being adapted to the inner diameter of the shaft hole (503); The limiting fixing assembly (3) comprises a guide seat (301), a movable limiting arm (302) and a limiting arc plate (303); the guide seat (301) is installed at the four corners of the top of the driving platform (9); a movable limiting arm (302) is slidably provided in the guide seat (301); one end of the movable limiting arm (302) is movably connected to the mounting frame (12); and a limiting arc plate (303) is installed below one end of the movable limiting arm (302).

2. The shaft seal end cover fixture of a screw vacuum pump according to claim 1, characterized in that: The positioning and fixing assembly (2) comprises a positioning cylinder (201), a connecting seat (202) and a positioning clamping plate (203); the positioning cylinder (201) is mounted on one side of the stand (4); the connecting seat (202) is mounted on the output end of the positioning cylinder (201); and the positioning clamping plate (203) is detachably mounted on one side of the connecting seat (202) via bolts.

3. The shaft seal end cover fixture of a screw vacuum pump according to claim 2, characterized in that: The inner side surface of the positioning clamp plate (203) is a curved surface structure, and an anti-slip pad (204) is provided on the curved surface structure of the inner side surface of the positioning clamp plate (203).

4. The shaft seal end cover fixture of a screw vacuum pump according to claim 1, characterized in that: The spacing adjustment mechanism (6) comprises a bidirectional screw (601), a through slot (602) and a servo motor (603); the bidirectional screw (601) is rotatably mounted inside the adjustment base (1); the bottom of the adjustment base (1) is provided with a through slot (602) communicating with the cavity; the movable base (7) is slidably connected to the through slot (602); the lower end of the movable base (7) is threadedly connected to the bidirectional screw (601); and the bidirectional screw (601) is driven by the servo motor (603).

5. The shaft seal end cover fixture of a screw vacuum pump according to claim 1, characterized in that: The four supporting arms of the mounting frame (12) are provided with movable grooves (13), and the upper part of one end of the movable limiting arm (302) is movably connected to the movable groove (13) via a connecting rod (14).

6. The shaft seal end cover fixture of a screw vacuum pump according to claim 1, characterized in that: The driving platform (9) is a circular platform, and the diameter of the driving platform (9) is smaller than the diameter of the shaft hole (503) of the shaft seal end cover body (5).

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