Special fixture for gear pump spacer bush flat turning

Abstract

The utility model belongs to the technical field of professional clamping devices, and particularly relates to a special fixture for gear pump spacer bush flattening machining, which comprises a base, a boss arranged on the back of the base, a positioning disc fixedly connected to the front of the base, six side faces arranged on the positioning disc, spacer bush flattening assemblies arranged on each face of the positioning disc, and a clamping device arranged on the boss. The spacer bush and the positioning pressing plate sequentially penetrate through a positioning rod perpendicularly connected to the side face of the positioning disc, and the upper portion of the positioning pressing plate is fixedly connected with a locking nut. According to the utility model, the whole clamp is driven to rotate through the rotation of the lathe spindle, and the spacer bush (before being flattened) is flattened by using a turning tool. Traditional milling feeding is replaced by rotating motion of a lathe spindle, turning transformation of the milling function is achieved, the machining procedure is simplified, flat turning machining of six spacer bushes can be completed through one-time clamping, the structure is simple, clamping is efficient, machining precision is high, and machining efficiency is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of professional clamping devices, specifically relating to a special fixture for flattening gear pump spacers. Background Technology

[0002] Spacers are one of the core components of gear pumps, playing a supporting and positioning role. Spacers are usually used in pairs, and their rotation is prevented by milling them flat.

[0003] Milling the flattened portion of a gear pump spacer is typically done using a milling machine, a process that is complex, difficult to guarantee in terms of accuracy, and inefficient. Furthermore, milling machines are expensive and require highly skilled operators, which limits the improvement of production efficiency. Therefore, a specialized fixture is needed that simplifies the machining process, provides efficient clamping, and offers high machining accuracy. Utility Model Content

[0004] This utility model provides a special fixture for flattening gear pump spacers to solve the problems mentioned in the background art.

[0005] This utility model is achieved through the following technical solution:

[0006] A special fixture for flattening gear pump spacers includes a base with a boss on the back and a positioning plate fixedly connected to the front of the base. The positioning plate has six sides, and each side of the positioning plate is provided with a spacer (before flattening). The spacer (before flattening) and the positioning pressure plate pass through a positioning rod vertically connected to the side of the positioning plate in sequence. A locking nut is fixedly connected to the upper part of the positioning pressure plate.

[0007] Furthermore, the positioning disc is positioned and connected to the base via bolts and cylindrical pins.

[0008] Furthermore, the positioning disc has a retaining ring groove at the cylindrical pin hole for placing a retaining ring for the hole.

[0009] Furthermore, the positioning rod has threads at both ends and a flat opening at one end.

[0010] Furthermore, the positioning rod is clearance-fitted with the positioning pressure plate, and the positioning pressure plate is clearance-fitted with the spacer (before flattening), with a fit clearance of 0.1~0.2mm.

[0011] Furthermore, the positioning disk has a symmetrically distributed hexagonal structure with an included angle of 120 degrees between adjacent sides.

[0012] The beneficial effects achieved by using the above technical solution are as follows:

[0013] 1. By using the rotational motion of the lathe spindle to replace the traditional milling feed, the milling function is transformed into a turning function, simplifying the machining process and improving production efficiency.

[0014] 2. This fixture can complete the flattening of six spacers (before flattening) in one clamping. It has a simple structure and high clamping efficiency, which greatly improves the processing efficiency.

[0015] 3. Each side is equipped with a quick-clamping assembly consisting of a positioning rod, a spacer (before flattening), a positioning pressure plate, and a locking nut. The positioning pressure plate achieves axial positioning and radial constraint of the spacer (before flattening), improving machining accuracy.

[0016] 4. The base and positioning plate adopt a combined design, and precise positioning and connection are achieved through cylindrical pins and bolts to ensure repeatability of clamping accuracy. By replacing the positioning plate, positioning rod, positioning pressure plate and locking nut, different specifications of spacers (before flattening) can be quickly replaced. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the spacers in pairs after flattening.

[0018] Figure 2 This is a structural schematic diagram of the present invention (front view);

[0019] Figure 3 This is a structural schematic diagram of the present invention (back side);

[0020] Figure 4 This is an exploded schematic diagram of this utility model.

[0021] Attached reference numerals: 1. Positioning rod, 2. Locking nut, 3. Positioning pressure plate, 4. Spacer (before flattening), 5. Base, 6. Positioning disc, 7. Bolt, 8. Cylindrical pin, 9. Hole retaining ring. Detailed Implementation

[0022] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0023] like Figure 1 As shown, the spacer (before flattening) 4 is used in the gear pump after flattening. The flattened spacers have opposite openings and are used in pairs to prevent the spacers from rotating during the operation of the gear pump.

[0024] like Figures 2-4As shown, a special fixture for flattening gear pump spacers includes a base 5 with a boss on its back. A positioning plate 6 is fixedly connected to the front of the base 5. The positioning plate 6 has six sides, each with a spacer (front flattening) assembly. The spacer (front flattening) 4 and the positioning pressure plate 4 pass sequentially through a positioning rod 1 vertically connected to the side of the positioning plate 3. A locking nut 2 is fixedly connected to the upper part of the positioning pressure plate 3. The back of the base 5 is pressed against the surface of a lathe three-jaw chuck, which clamps the boss of the base 5. The positioning plate 6 and the base 5 are designed as a combination, allowing for the selection of different positioning plates 6, positioning rods 1, positioning pressure plates 3, and locking nuts 2 according to different sizes of spacers (front flattening) 4. The positioning plate 6 has six sides, each with a spacer (front flattening) assembly, allowing for the machining of all six spacers (front flattening) 4 in a single clamping, thus improving machining efficiency.

[0025] Furthermore, the positioning disk 6 is positioned and connected to the base 1 via bolts 7 and cylindrical pins 8. The cylindrical pins 8 are inserted into the cylindrical pin holes of the base 5 and the positioning disk 6, achieving precise positioning of the base 5 and the positioning disk 6. The bolts 7 pass through the through hole of the positioning disk 6 and connect to the threaded hole of the base 5, achieving connection between the base 5 and the positioning disk 6. This ensures concentric positioning and rigid connection between the base 5 and the positioning disk 6, guaranteeing the accuracy of repeated clamping. The combined design of the base 5 and the positioning disk 6 allows for the selection of a suitable size positioning disk 6 based on different sizes of spacers (before flattening) 4, reducing the manufacturing cost of the fixture.

[0026] Furthermore, the positioning disk 6 has a retaining ring groove at the cylindrical pin hole for placing the retaining ring 9. The cylindrical pin 8 is placed into the cylindrical pin hole of the base 5 and the positioning disk 6, and then the retaining ring 9 is placed in the retaining ring groove of the positioning disk 6 to prevent the cylindrical pin 8 from falling out of the cylindrical pin hole when the clamp rotates.

[0027] Furthermore, the positioning rod 1 has threads at both ends and a flat end. The thread at the lower end of the positioning rod 1 allows for a fixed connection with the positioning disc 6, while the thread at the upper end allows for a fixed connection with the locking nut 2, thus securing the entire spacer (before flattening) assembly. The flat end of the positioning rod 1 allows for quick replacement using a wrench, saving replacement time.

[0028] Furthermore, the positioning rod 1 is clearance-fitted with the positioning pressure plate 3, and the positioning pressure plate 3 is clearance-fitted with the spacer (before flattening) 4, with a fit clearance of 0.1~0.2mm. The spacer (before flattening) 4 passes through the positioning rod 1, and its position cannot be precisely fixed. By placing the positioning pressure plate 3 on top, and ensuring a clearance fit between the positioning pressure plate 3 and the positioning rod 1, the spacer (before flattening) 4 is precisely positioned, thereby improving the processing accuracy of the flattening.

[0029] Furthermore, the positioning disk 6 features a symmetrically distributed hexagonal structure with adjacent sides forming an angle of 120 degrees. This symmetrical hexagonal structure avoids dynamic imbalance during processing and eliminates vibrations generated during machining.

[0030] When installing the special fixture for flattening gear pump spacers according to this utility model, first, the back of the base 5 is pressed tightly against the surface of the lathe's three-jaw chuck. The three-jaw chuck clamps the boss on the back of the base 5, thus achieving a fixed connection between the base 5 and the lathe's three-jaw chuck. A cylindrical pin 8 is passed through the through holes of the positioning plate 6 and the base 5 to precisely position the base 5 and the positioning plate 6 coaxially. A retaining ring 9 is inserted into the retaining ring groove to prevent the cylindrical pin 8 from falling out during machining. Then, a bolt is passed through the through hole of the positioning plate 6 and connected to the threaded hole of the base 5, thus achieving a precise fixed connection between the positioning plate 6 and the base 5. The positioning rod 1 is firmly fixed by perpendicularly connecting the threaded hole on the side of the positioning plate 6 to the thread of the positioning rod 1, and by using a wrench to clamp the flat end of the positioning rod 1. The spacer (before flattening) 4 passes through the positioning rod 1, and the positioning pressure plate 3 is placed on top of it to achieve precise positioning of the spacer (before flattening) 4 by the positioning pressure plate 3. Then, the thread of the positioning rod 1 is connected to the locking nut 2. By tightening the locking nut 2, the positioning pressure plate 3 is pressed, thereby achieving the locking and fixing of the entire spacer (before flattening) assembly. The positioning plate 6 is installed in the same way on all six sides. The rotation of the lathe spindle drives the rotation of the entire fixture, and the lathe tool feeds to achieve the flattening of the six spacers (before flattening) 4.

[0031] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A special fixture for flattening gear pump spacers, comprising a base (5), a boss on the back of the base (5), a positioning plate (6) fixedly connected to the front of the base (5), the positioning plate (6) having six sides, each side of the positioning plate (6) having a spacer flattening assembly, the spacer (4) and the positioning pressure plate (3) passing through the positioning rod (1) vertically connected to the side of the positioning plate in sequence, and a locking nut (2) fixedly connected to the upper part of the positioning pressure plate (3).

2. The special fixture for flattening gear pump spacers according to claim 1, characterized in that: The positioning plate (6) is positioned and connected to the base (5) by bolts (7) and cylindrical pins (8).

3. The special fixture for flattening gear pump spacers according to claim 2, characterized in that: The positioning disk (6) has a retaining ring groove at the cylindrical pin hole for placing the hole retaining ring (9).

4. A special fixture for flattening gear pump spacers according to claim 1, characterized in that: The positioning rod (1) has threads at both ends and a flat opening at one end.

5. A special fixture for flattening gear pump spacers according to claim 1, characterized in that: The positioning rod (1) is fitted with the positioning pressure plate (3) with a clearance, and the positioning pressure plate (3) is fitted with the spacer (4) with a clearance of 0.1 to 0.2 mm.

6. A special fixture for flattening gear pump spacers according to claim 1, characterized in that: The positioning disk (6) has a symmetrical hexagonal structure with an included angle of 120 degrees between adjacent sides.

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