Fine boring and expanding clamp for pump shell of gear pump

Abstract

A fine boring expansion-drawing clamp for a pump shell of a gear pump belongs to mechanical manufacturing process equipment and is characterized in that a supporting plate is arranged on an oil way bottom plate, and a limiting nail and a conical pull rod are arranged on the supporting plate; a cylinder barrel is arranged in the oil way bottom plate, a first-stage piston is arranged in the cylinder barrel, a piston rod of the first-stage piston is sleeved with a second-stage piston, and a cushion cover is arranged on the second-stage piston; a spacer sleeve is embedded into the upper portion in the cylinder barrel, an expansion sleeve is placed in the spacer sleeve, a gland is arranged on the upper portion of the cylinder barrel, the gland is pressed on the horizontal portion of the expansion sleeve and embedded into the spacer sleeve, a conical pull rod on a supporting plate penetrates into the expansion sleeve to be connected with a piston rod inner thread of a first-stage piston, and a limiting nail on the supporting plate is embedded into the supporting plate. Compared with the prior art, manual pressing of the upper end face of an existing pressing plate workpiece is changed into expansion of inner holes in the four corners of the workpiece through the expansion sleeve, the workpiece is more firmly fixed to the supporting plate, the machining quality of the workpiece is guaranteed, meanwhile, the face milling procedure and the hole boring procedure are combined into one procedure, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the field of mechanical manufacturing process equipment, in particular to a precision boring, expanding and drawing fixture for a gear pump casing. Background Art

[0002] The gear pump casing is a key component of the gear pump, produced in large batches and across a wide variety of products. The numerous machining steps, particularly the fine boring of the gear cavity, result in low production efficiency. The existing fine boring process involves manual alignment and clamping of the workpiece's upper end face on the pressure plate. This results in insufficient firmness between the workpiece and the support plate, low clamping efficiency, inconsistent pressure at the pressure point, and tool vibration during machining. Furthermore, the boring and milling processes must be performed separately, resulting in very low production efficiency. Summary of the Invention

[0003] The purpose of the utility model is to overcome the above technical deficiencies and provide a gear pump casing precision boring and expansion clamp which has a simple structure, high production efficiency and guaranteed processing quality.

[0004] The technical solution adopted by the utility model to solve the technical problem is: the gear pump pump casing precision boring and expansion clamp includes an oil circuit bottom plate, which is characterized in that a support plate is provided on the oil circuit bottom plate, a columnar hole is provided in the center of the support plate, a raised square platform is provided on the support plate around the columnar hole, limiting pins are provided at two diagonal positions of the square platform, and tapered pull rods are provided at the other two diagonal positions; a cylinder is provided in the oil circuit bottom plate, the position of the cylinder corresponds to the position of the tapered pull rod, a first-stage piston is installed in the lower part of the cylinder, and a first-stage piston is installed in the lower part of the cylinder. A secondary piston is fitted over the piston rod of the secondary piston. A spacer sleeve is installed above the secondary piston and the upper portion of the primary piston's rod. A spacer sleeve is embedded in the upper portion of the cylinder barrel, and a convex expansion sleeve is placed within the spacer sleeve. The convex portion of the expansion sleeve is tapered internally, and the convex portion is above the oil circuit baseplate. A gland is installed on the upper portion of the cylinder barrel, pressing against the horizontal portion of the expansion sleeve and embedding into the spacer sleeve. A tapered pull rod on the support plate passes through the expansion sleeve and connects to the internal thread of the primary piston rod. The limit pins on the support plate are embedded in the support plate. The oil circuit baseplate is equipped with two oil circuits: one above the primary piston in the cylinder barrel, and the other below the primary piston. Both oil circuits are connected to hydraulic oil pipes.

[0005] The beneficial effects of the utility model are as follows: the gear pump casing precision boring and expansion clamp changes the existing manual pressing of the upper end face of the pressure plate workpiece to the expansion sleeve expansion of the four corners of the workpiece to tighten the inner holes, so that the workpiece is more firmly fixed on the support plate, ensuring the consistency of the clamping and the pressure of the pressure point, avoiding the tool vibration phenomenon during processing, and ensuring the processing quality of the workpiece. At the same time, after using this clamp, the process that was originally only used for boring can not only bore holes but also mill surfaces, and the two processes of milling and boring holes are combined into one process, which greatly improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The following is a detailed description of the embodiments with reference to the accompanying drawings:

[0007] Figure 1 This is the appearance and structure diagram of the gear pump casing precision boring, expansion and tensioning fixture.

[0008] Figure 2 yes Figure 1 A-A cross-sectional view and structural diagram of the clamped workpiece.

[0009] In the figure, 1-oil circuit base plate; 1-1-oil circuit hole 2; 1-2-oil circuit hole 1; 1-3-oil circuit base plate mounting hole; 1-4-oil circuit junction 1; 1-5-oil circuit junction 2; 2-support plate; 2-1-support plate mounting hole; 2-2-columnar hole; 3-limiting pin; 4-tapered pull rod; 5-expansion sleeve; 6-pressure cover; 7-spacer sleeve; 8-secondary piston; 9-primary piston; 9-1-piston rod; 10-spacer sleeve; 11-workpiece; 11-1-positioning hole 1; 11-2-positioning hole 2; 11-3-expansion hole 1; 11-4-expansion hole 2. DETAILED DESCRIPTION

[0010] For example, see the attached Figures 1 and 2, a double-station gear pump casing fine boring and expansion fixture is provided on the oil circuit base plate 1. Six base plate mounting holes 1-3 are provided on the oil circuit base plate 1 for fixing and installing the oil circuit base plate 1. The six base plate mounting holes are distributed at the left, middle and right positions of the oil circuit base plate 1, and are arranged in pairs in front and back. Oil circuit 1 and oil circuit 2 are provided in the oil circuit base plate 1. Oil circuit 1 and oil circuit 2 are both connected to the inner cavity of the cylinder, wherein oil circuit 1 is on the upper part of the first-stage piston 9 in the cylinder, and oil circuit 2 is on the lower part of the first-stage piston 9 in the cylinder. There is a Oil circuit hole 1-2 and oil circuit hole 2 1-1, oil circuit port 1-4 and oil circuit port 2 1-5 are provided on the front right side of the oil circuit base plate 1, oil circuit 1 includes oil circuit hole 1-2 and oil circuit port 1-4, oil circuit 2 includes oil circuit hole 2 1-1 and oil circuit port 2 1-5; oil circuit hole 1-2 and oil circuit port 1 1-4 are communicated, oil circuit hole 2 1-1 is communicated with oil circuit port 2 1-5, oil circuit port 1-4 and oil circuit port 2 1-5 are respectively connected to hydraulic oil pipes. Two support plates 2 are provided on the oil circuit base plate 1, an elliptical cylindrical hole 2-2 is provided in the center of the support plate 2, a raised rectangular platform is provided on the support plate 2 around the cylindrical hole 2-2, conical pull rods 4 are symmetrically provided at the upper left corner and the lower right corner of the rectangular platform, limiting pins 3 are symmetrically provided at the upper right corner and the lower left corner of the rectangular platform, and support plate mounting holes 2-1 are respectively provided at the four corners of the support plate 2 for fixing the support plate 2 and the oil circuit base plate 1. A cylinder is provided at a position corresponding to the tapered pull rod 4 in the oil circuit bottom plate 2, and a first-level piston 9 is installed in the lower part of the cylinder, and a second-level piston 8 is installed on the piston rod 9-1 of the first-level piston 9, and a gasket 10 is provided on the end of the second-level piston 8 and on the outer side of the upper part of the piston rod 9-1. A spacer sleeve 7 is placed in the remaining space in the cylinder, and an expansion sleeve 5 with a convex cross-section is placed in the spacer sleeve 7. The expansion sleeve 5 is at the upper end of the gasket 10, and a part of the raised part of the expansion sleeve 5 protrudes from the oil circuit bottom plate 1, and a pressure cover 6 is provided on the upper part of the cylinder. The pressure cover 6 is pressed on the horizontal part of the expansion sleeve 5 and embedded in the spacer sleeve 7, so that the tapered pull rod 4 on the support plate 2 is inserted into the expansion sleeve 5 and connected with the internal thread of the piston rod 9-1 of the first-level piston 9, and the limiting pin 3 on the support plate 2 is embedded in the support plate 2.

[0011] The working process of the precision boring and expansion clamp for the gear pump casing is as follows: with one side of the workpiece 11 facing downward, the positioning hole 11-1, the positioning hole 2 11-2, the expansion hole 11-3, and the expansion hole 2 11-4 are inserted into the limit pin 3 and the expansion sleeve 5, and are tightly pressed against the plane of the support plate 2. The hydraulic pressure is started, and oil is fed into the oil passage hole 1-2. Since the piston diameter of the first-stage piston 9 is larger than the piston diameter of the second-stage piston 8, the force area and pressure of the first-stage piston 9 are large under the same pressure. The piston rod 9-1 of the first-stage piston 9 first moves downward, driving the tapered pull rod 4 downward, and the tapered surface of the tapered pull rod 4 fits with the inner tapered surface of the expansion sleeve 5, driving the expansion sleeve 5 to expand outward, and tightening the expansion hole; since the piston area of ​​the second-stage piston 8 is smaller than the piston area of ​​the first-stage piston 9, the pressure is small under the same pressure. When the first-stage piston 9 moves downward to expand the workpiece 11, if there is a gap between the workpiece 11 and the support plate 2, the first-stage piston 9 will continue to move downward, driving the second-stage piston 8 downward, so that the gap between the workpiece 11 and the support plate 2 disappears. The above actions can complete the expansion and pulling-down actions, ensuring that the workpiece 11 is firmly fixed on the support plate, and then the workpiece 11 can be milled and bored.

Claims

1. A gear pump casing fine boring and expansion fixture, comprising an oil circuit base plate (1), characterized in that: A support plate (2) is provided on the oil circuit bottom plate (1), a columnar hole (2-2) is provided at the center of the support plate (2), a raised square platform is provided on the support plate (2) around the columnar hole (2-2), limiting pins (3) are provided at two diagonal positions of the square platform, and tapered pull rods (4) are provided at the other two diagonal positions; a cylinder is provided in the oil circuit bottom plate (1), the position of the cylinder corresponds to the position of the tapered pull rod (4), a first-stage piston (9) is provided in the lower part of the cylinder, a second-stage piston (8) is fitted on the piston rod (9-1) of the first-stage piston (9), a cushion sleeve (10) is provided on the second-stage piston (8) and the upper part of the piston rod (9-1) of the first-stage piston (9); a spacer sleeve (7) is embedded in the upper part of the cylinder, A convex expansion sleeve (5) is placed in the spacer sleeve (7), and the protruding part of the expansion sleeve (5) is tapered inside, and the protruding part is above the oil circuit bottom plate (1); a pressure cover (6) is provided on the upper part of the cylinder, and the pressure cover (6) is pressed on the horizontal part of the expansion sleeve (5) and embedded in the spacer sleeve (7); the tapered pull rod (4) on the support plate (2) is inserted into the expansion sleeve (5) and connected to the inner thread of the piston rod (9-1) of the first-stage piston (9); the limiting pin (3) on the support plate (2) is embedded in the support plate (2); the oil circuit bottom plate (1) is provided with two oil circuits, one of which is on the upper part of the first-stage piston (9) in the cylinder, and the other is on the lower part of the first-stage piston (9) in the cylinder, and the two oil circuits are respectively connected to the hydraulic oil pipe.

2. The gear pump casing precision boring and expansion fixture according to claim 1, characterized in that: The two oil circuits are oil circuit 1 and oil circuit 2, respectively. Oil circuit 1 includes oil circuit hole 1 (1-2) and oil circuit port 1 (1-4), and oil circuit 2 includes oil circuit hole 2 (1-1) and oil circuit port 2 (1-5). Oil circuit hole 1 (1-2) and oil circuit port 1 (1-4) are connected, and oil circuit hole 2 (1-1) and oil circuit port 2 (1-5) are connected. Oil circuit port 1 (1-4) and oil circuit port 2 (1-5) are respectively connected to hydraulic oil pipes.

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