A pressure-retaining clamp that uses a nitrogen spring as a power source for clamping

Abstract

A pressure-maintaining clamp that uses a nitrogen spring as a power source for clamping is mainly used for automatic clamping and loosening of the clamp. The oil cylinder is connected to the pressure plate through a pull rod, the hinge sleeve is connected to the pressure plate after matching with the shaft of the nitrogen spring, the hinge seat is connected to the hinge through a pin, the hinge and the pressure plate are connected through a pin, and the hinge seat is fixed together with the clamp body. Compared with the prior art, when the oil cylinder is in a free state, the nitrogen spring applies an upward spring force to one end of the pressure plate, and the pressure plate clamps the parts; when the oil cylinder is working, the pressure plate is pulled downward through the pull rod and the pull rod seat, and at the same time, the hinge sleeve compresses the nitrogen spring to overcome the spring force of the nitrogen spring, the pressure plate is lifted, and the parts are loosened. The present invention uses a nitrogen spring as a power source to achieve pressure maintenance of the clamp, which reduces the manufacturing cost and maintenance cost of the pressure-maintaining clamp by at least about 70%, has a simple structure, is convenient and quick to operate, has reliable clamping, and has stable part processing quality.

Description

Technical Field

[0001] The invention relates to the technical field of automatic clamping of clamps, in particular to a device for automatically clamping parts by utilizing nitrogen spring force. Background Art

[0002] The most advanced automatic lines for horizontal machining centers usually use automatic loading and unloading, and the premise for achieving automatic loading and unloading is the automatic clamping of the fixture. At present, the automatic clamping of the fixtures of the automatic lines of domestic horizontal machining centers all use hydraulic pressure-maintaining fixtures. The principle is: the fixture uses hydraulic automatic clamping outside the automatic line, and then disconnects the hydraulic system to achieve pressure maintenance (maintain a constant clamping pressure to clamp the parts) and process. After the processing is completed, it is automatically connected to the hydraulic system outside the line to carry out the next working cycle. However, the hydraulic pressure-maintaining fixture has particularly high requirements for the sealing of hydraulic components, and the price is extremely expensive, with a unit price of about 100,000 yuan, and the subsequent maintenance costs are also quite high. In order to reduce costs, it is becoming increasingly important to study a device that uses nitrogen spring force to automatically clamp parts. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, an object of the present invention is to provide a pressure-maintaining clamp that uses a nitrogen spring as a power source for clamping, so as to reduce the manufacturing cost of the clamp.

[0004] To achieve the above-mentioned purpose of the invention, the oil cylinder of the present invention is connected to the pressure plate through a pull rod, the hinge sleeve is connected to the pressure plate after matching with the shaft of the nitrogen spring, the hinge seat is connected to the hinge through a pin shaft, the hinge and the pressure plate are connected through a pin shaft, and the hinge seat is fixed together with the clamp body.

[0005] The oil cylinder is connected to the oil cylinder seat by screws, and the oil cylinder seat is fixed to the fixture body by screws; the nitrogen spring is connected and fixed to the nitrogen spring seat by screws, and the nitrogen spring seat is connected to the fixture body by screws; the oil cylinder is connected to the pull rod seat by screws, the pull rod and the pull rod seat are matched through a hole, the pull rod and the end of the pressure plate are matched through a groove, and are connected by a pin shaft, and the pull rod passes through the hole on the fixture body for guidance; the hinge sleeve and the end of the pressure plate are matched through a groove and are connected by a pin shaft, and the hinge sleeve and the nitrogen spring are matched through the shaft at the upper end of the nitrogen spring; the hinge seat is connected to the lower end of the hinge by a pin shaft, the upper end of the hinge is connected to the middle part of the pressure plate by a pin shaft, and the hinge seat is connected to the fixture body by screws.

[0006] Compared with the prior art, the present invention has the following characteristics: when the oil cylinder is in a free state, the nitrogen spring applies an upward spring force to one end of the pressure plate, and the pressure plate clamps the parts; when the oil cylinder is working, the pressure plate is pulled downward by the pull rod and the pull rod seat, and at the same time, the hinge sleeve compresses the nitrogen spring, overcomes the spring force of the nitrogen spring, and the pressure plate is lifted to release the parts. The present invention uses the nitrogen spring as a power source to achieve the pressure maintenance of the clamp, which reduces the manufacturing cost and maintenance cost of the pressure maintenance clamp by at least 70%, has a simple structure, is convenient and quick to operate, has reliable clamping, and has stable part processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the structure of the present invention in a clamping state.

[0008] Figure 2 yes Figure 1 Side view of.

[0009] Figure 3 It is a schematic structural diagram of the present invention in a loosened state. DETAILED DESCRIPTION

[0010] like Figure 1 , Figure 2 , Figure 3 As shown, the oil cylinder 1 of the present invention is connected to the oil cylinder seat 2 by screws, and the oil cylinder seat 2 is fixed to the fixture body 5 by screws; the nitrogen spring 4 is connected and fixed to the nitrogen spring seat 3 by screws, and the nitrogen spring seat 3 is connected to the fixture body 5 by screws; the oil cylinder 1 is connected to the tie rod seat 13 by screws 14, the tie rod 12 and the tie rod seat 13 are matched through holes, the tie rod 12 and the end of the pressure plate 9 are matched through grooves, and are connected by a pin 11, and the tie rod 12 passes through the hole on the fixture body 5 for guidance; the hinge sleeve 6 and the end of the pressure plate 9 are matched through grooves and are connected by a pin 11, and the hinge sleeve 6 and the nitrogen spring 4 are matched through the shaft at the upper end of the nitrogen spring 4; the hinge seat 8 is connected to the lower end of the hinge 7 by a pin, the upper end of the hinge 7 is connected to the middle part of the pressure plate 9 by a pin, and the hinge seat 8 is connected to the fixture body 5 by screws. After the parts are positioned, the hydraulic system is disconnected, and the cylinder 1 returns to a free state. After the tension of the compressed nitrogen spring 4 is removed from the cylinder 1, the nitrogen spring 4 exerts an upward spring force on the pressure plate 9. The pressure plate 9 clamps the parts under the action of the spring force, and the pipeline connection between the fixture and the hydraulic system is disconnected. The fixture enters the automatic line body for part cutting.

[0011] When the oil cylinder 1 is in a free state, the nitrogen spring 4 applies an upward spring force to one end of the pressure plate 9, so that the pressure plate 9 clamps the part 10; at this time, the nitrogen spring 4 is compressed by 10mm, and the spring force acting on the pressure plate 9 can reach about 600Kg, which is equivalent to the clamping force of a hydraulic cylinder with a cylinder diameter of 63mm.

[0012] When the part 10 is processed and returns to the loading and unloading station, the operator connects the hydraulic system pipeline to the fixture, starts the hydraulic system, and the cylinder 1 works. The pressure plate 9 is pulled downward through the pull rod 12 and the pull rod seat 13. At the same time, the hinge sleeve 6 compresses the nitrogen spring 4 to overcome the spring force of the nitrogen spring 4. The pressure plate 9 is lifted and the part 10 can be released.

Claims

1. A pressure-maintaining clamp using a nitrogen spring as a power source, characterized in that: The oil cylinder (1) is connected to the pressure plate (9) via a pull rod (12); the hinge sleeve (6) is connected to the pressure plate (9) after being matched with the axis of the nitrogen spring (4); the hinge seat (8) is connected to the hinge (7) via a pin shaft; the hinge (7) is connected to the pressure plate (9) via a pin shaft; the hinge seat (8) is fixed to the fixture body (5); the oil cylinder (1) is connected to the oil cylinder seat (2) via screws; the oil cylinder seat (2) is fixed to the fixture body (5) via screws; the nitrogen spring (4) is connected to the nitrogen spring seat (3) via screws; the nitrogen spring seat (3) is connected to the fixture body (5) via screws; the oil cylinder (1) is connected to the pull rod seat (13) via screws (14); the pull rod (12) is matched with the pull rod seat (13) via holes; the pull rod (12) is fixed to the pressure plate (5) via screws; the oil cylinder (1) is connected to the pull rod seat (13) via screws ... The end of the plate (9) is matched through a groove and connected by a pin (11), and the pull rod (12) passes through the hole on the clamp body (5) for guidance; the hinge sleeve (6) and the end of the pressure plate (9) are matched through a groove and connected by a pin (11), and the hinge sleeve (6) and the nitrogen spring (4) are matched through the shaft at the upper end of the nitrogen spring (4); the hinge seat (8) is connected to the lower end of the hinge (7) through a pin, the upper end of the hinge (7) is connected to the middle of the pressure plate (9) through a pin, and the hinge seat (8) is connected to the clamp body (5) through a screw; when the cylinder (1) is in a free state, the nitrogen spring (4) applies an upward spring force to one end of the pressure plate (9), so that the pressure plate (9) clamps the part (10); at this time, the nitrogen spring (4) is compressed by 10 mm.

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