Automatic three-jaw clamp for external diameter and clamping method for shaft parts

Abstract

This invention discloses an automatic three-jaw clamp for external diameters, including a fixed base with a mounting groove in the middle. A clamping sleeve is inserted into the mounting groove, and a reset mechanism is provided between the lower part of the clamping sleeve and the bottom of the mounting groove. Three movable clamping rods are triangularly distributed above the fixed base. Three mounting seats are distributed on the upper surface of the clamping sleeve, each with a through hole and sliding grooves on both sides. The lower ends of the three movable clamping rods are hinged to the fixed base, and the upper ends of the three movable clamping rods are respectively inserted into the three through holes and slidably positioned in the sliding grooves via pins. In use, the height of the adjusting threaded sleeve is adjusted according to the outer diameter of the shaft end of the shaft part, ensuring that the center hole of the shaft end of the shaft part is in full contact with the center of the equipment. This allows the three movable clamping rods to simultaneously clamp the outer diameter of the shaft end of the shaft part, ensuring sufficient clamping force. It has the advantages of flexible operation, simple structure, and good versatility, and is worthy of widespread use.

Description

Technical Field

[0001] This invention relates to an automatic three-jaw clamp for external diameters and a clamping method for shaft parts. Background Technology

[0002] In the clamping of shaft parts during external cylindrical grinding, gear grinding, and inspection using specialized equipment, in addition to using centers to press against the center holes at both ends, one end of the shaft must be clamped and connected to the rotating spindle of the equipment to drive the shaft to rotate before grinding and inspection can be performed. Existing technologies mostly use a chuck-like clamp method, which has a long operation time and poor versatility. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides an automatic three-jaw clamp for outer diameters that is simple in structure and reliable in operation, and provides a clamping method for shaft parts that is easy to operate.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is: an automatic three-jaw clamping device for outer circles, including a fixed base and a clamping sleeve. The fixed base has a mounting groove in the middle. The lower part of the clamping sleeve is inserted into the mounting groove. A reset mechanism is provided between the lower part of the clamping sleeve and the bottom of the mounting groove. Three movable clamping rods are distributed in a triangle above the fixed base. The upper end face of the clamping sleeve has three mounting seats distributed in a triangle. The mounting seats have through holes for the movable clamping rods to be inserted. Sliding grooves are opened on both sides of the through holes. The lower ends of the three movable clamping rods are all hinged to the fixed base by movable pins. The upper ends of the three movable clamping rods are respectively inserted into the three through holes and can be slidably set in the sliding grooves by pins.

[0005] The aforementioned automatic three-jaw clamping device for outer diameter has an adjusting threaded sleeve in the middle of the upper end face of the clamping sleeve. By adjusting the height of the adjusting threaded sleeve, the center hole at the end of the shaft part can be fully in contact with the center of the adjusting threaded sleeve.

[0006] In the aforementioned automatic three-jaw clamping device for outer circles, the reset mechanism is a spring, with the lower end of the spring fixed to the bottom of the mounting groove and the upper end of the spring fixed to the lower part of the clamping sleeve.

[0007] In the aforementioned automatic three-jaw clamping device, the lower part of the clamping sleeve is a cylindrical structure, which is inserted into the mounting groove, and the upper end of the spring is fixed to the lower end face of the cylindrical structure.

[0008] The aforementioned automatic three-jaw clamp for outer diameter has three mounting brackets evenly distributed around the fixed base for installing movable pins.

[0009] In the aforementioned automatic three-jaw clamping device for outer circles, the sliding groove is inclined from top to bottom and outward.

[0010] A clamping method for shaft-type parts includes the following steps:

[0011] Step 1: Fix the external automatic three-jaw clamp onto the main shaft of the equipment. In the initial state, the pin of the external automatic three-jaw clamp is located at the bottom of the slide groove.

[0012] Step 2: Insert the shaft part from top to bottom into the space between the three mounting bases;

[0013] Step 3: After the top of the shaft part is in contact with the center, the shaft part presses against the clamping sleeve of the automatic three-jaw clamping device. The clamping sleeve compresses the spring and moves downward. During the downward movement of the clamping sleeve, the pin moves from the bottom of the slide groove to the top, thereby driving the upper end of the movable clamping rod to extend out of the through hole and clamp the outer circle of the shaft part.

[0014] In the clamping method for the aforementioned shaft parts, step two further includes adjusting the height of the adjusting threaded sleeve according to the outer diameter of the shaft end of the shaft part, so that the center hole at the shaft end of the shaft part is in full contact with the center of the adjusting threaded sleeve of the equipment.

[0015] The beneficial effects of this invention are as follows: When in use, the height of the adjusting threaded sleeve is adjusted according to the outer diameter of the shaft end of the shaft part, so that the center hole of the shaft end of the shaft part is in full contact with the center of the equipment. Then, the three movable clamping rods can simultaneously clamp the outer diameter of the shaft end of the shaft part and ensure sufficient clamping force. It has the advantages of flexible operation, simple structure and good versatility, and has the value of widespread use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an automatic three-jaw clamping device for outer circles.

[0017] Figure 2 This is a schematic diagram of the compression sleeve.

[0018] Figure 3 This is a schematic diagram of the movable clamping rod.

[0019] Figure 4 This is a structural diagram of the fixed base.

[0020] Figure 5 This is a schematic diagram of the external circular automatic three-jaw clamp in the clamping state when the shaft is installed. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] like Figures 1-4As shown, an automatic three-jaw clamping device for outer circles includes a fixed base 1 and a clamping sleeve 2. The fixed base 1 has a mounting groove 3 in the middle. The lower part of the clamping sleeve 2 is inserted into the mounting groove 3. A reset mechanism is provided between the lower part of the clamping sleeve 2 and the bottom of the mounting groove 3. Three movable clamping rods 4 are triangularly distributed above the fixed base 1. The upper end face of the clamping sleeve 2 has three mounting seats 5 triangularly distributed. The mounting seats 5 have through holes 6 for the movable clamping rods 4 to be inserted. Sliding grooves 7 are opened on both sides of the through holes 6. The sliding grooves 7 are inclined from top to bottom and outward. The lower ends of the three movable clamping rods 4 are all hinged to the fixed base 1 by movable pins 8. The upper ends of the three movable clamping rods 4 are respectively inserted into the three through holes 6 and are slidably disposed in the sliding grooves 7 by pins 9.

[0023] The upper end face of the clamping sleeve 2 is provided with an adjusting threaded sleeve 10. By adjusting the height of the adjusting threaded sleeve 10, the center hole at the end of the shaft rod 13 of the shaft part can be fully in contact with the center of the adjusting threaded sleeve 10.

[0024] The reset mechanism uses a spring 11, the lower end of which is fixed to the bottom of the mounting groove 3, and the upper end of which is fixed to the lower part of the clamping sleeve 2.

[0025] like Figure 2 As shown, the lower part of the clamping sleeve 2 is a cylindrical structure, which is inserted into the mounting groove 3, and the upper end of the spring 11 is fixed to the lower end face of the cylindrical structure.

[0026] like Figure 4 As shown, the fixed base 1 has three mounting brackets 12 evenly distributed around its circumference for mounting the movable pins 8.

[0027] A clamping method for shaft-type parts includes the following steps:

[0028] Step 1: Fix the external automatic three-jaw clamp onto the main shaft of the equipment. In the initial state, the pin 9 of the external automatic three-jaw clamp is located at the bottom of the slide groove 7.

[0029] Step 2: Insert the shaft part 13 from top to bottom into the space between the three mounting bases 5;

[0030] Step 3: After the ends of the shaft 13 are aligned, the ends of the shaft 13 press against the clamping sleeve 2 of the automatic three-jaw clamping device. The clamping sleeve 2 compresses the spring 11 and moves downward. During the downward movement of the clamping sleeve 2, the pin 9 gradually moves from the lowest position of the slide groove 7 to the upper position, thereby driving the upper end of the movable clamping rod 4 to extend out of the through hole 6 and clamp the outer circle of the end of the shaft 13.

[0031] Step two also includes adjusting the height of the adjusting threaded sleeve 10 according to the outer diameter of the shaft part 13, so that the center hole at the end of the shaft part 13 is in full contact with the center of the adjusting threaded sleeve 10.

[0032] like Figure 5 As shown, under the action of axial force, the clamping sleeve 2 is automatically clamped after the shaft parts are installed. After the shaft parts are depressurized, the clamping sleeve 2 is lifted by the force of the spring 11, and the movable clamping rod 4 is released and opened, so that the shaft parts can be removed.

Claims

1. An automatic three-jaw clamp for outer diameter, characterized in that: The device includes a fixed base and a clamping sleeve. The fixed base has a mounting groove in the middle, and the lower part of the clamping sleeve is inserted into the mounting groove. A reset mechanism is provided between the lower part of the clamping sleeve and the bottom of the mounting groove. Three movable clamping rods are distributed in a triangle above the fixed base. The upper end face of the clamping sleeve has three mounting seats distributed in a triangle. The mounting seats have through holes for the movable clamping rods to be inserted. Sliding grooves are opened on both sides of the through holes. The lower ends of the three movable clamping rods are all hinged to the fixed base by movable pins. The upper ends of the three movable clamping rods are respectively inserted into the three through holes and can be slidably set in the sliding grooves by pins. The upper end face of the clamping sleeve is provided with an adjusting threaded sleeve. By adjusting the height of the adjusting threaded sleeve, the center hole at the end of the shaft part can be fully in contact with the center of the adjusting threaded sleeve. The slide is inclined outward from top to bottom.

2. The automatic three-jaw clamp for outer diameter as described in claim 1, characterized in that: The reset mechanism uses a spring, with the lower end of the spring fixed to the bottom of the mounting groove and the upper end of the spring fixed to the lower part of the clamping sleeve.

3. The automatic three-jaw clamp for outer diameter as described in claim 2, characterized in that: The lower part of the clamping sleeve is a cylindrical structure, which is inserted into the mounting groove, and the upper end of the spring is fixed to the lower end face of the cylindrical structure.

4. The automatic three-jaw clamp for outer diameter as described in claim 1, characterized in that: The fixed base has three mounting brackets evenly distributed around its circumference for installing movable pins.

5. A clamping method for shaft parts using an automatic three-jaw clamping device for external diameters according to claim 4, characterized in that, Includes the following steps: Step 1: Fix the external automatic three-jaw clamp onto the main shaft of the equipment. In the initial state, the pin of the external automatic three-jaw clamp is located at the bottom of the slide groove. Step 2: Insert the shaft part from top to bottom into the space between the three mounting bases; Step 3: After the top of the shaft part is in contact with the center, the shaft part presses against the clamping sleeve of the automatic three-jaw clamping device. The clamping sleeve compresses the spring and moves downward. During the downward movement of the clamping sleeve, the pin moves from the bottom of the slide groove to the top, thereby driving the upper end of the movable clamping rod to extend out of the through hole and clamp the outer circle of the shaft part.

6. The clamping method for shaft-type parts according to claim 5, characterized in that: Step two also includes adjusting the height of the adjusting threaded sleeve according to the outer diameter of the shaft end of the shaft part, so that the center hole at the shaft end of the shaft part is in full contact with the center of the adjusting threaded sleeve of the equipment.

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