Cylinder inner hole expansion device

Abstract

The utility model discloses a barrel inner hole expansion device which comprises a fixing seat, a driving unit, a clamping unit and a clamping unit. The driving unit is used for driving the lead screw pair to move; the lead screw pair serves as a transmission unit of the driving unit, and a lead screw is connected with the driving unit; the nut connecting plate is connected with a nut of the lead screw pair; one end of each connecting rod is rotationally connected with the nut connecting plate, the other end of each connecting rod is rotationally connected with one end of the adjusting screw rod, and revolute pairs rotationally connected with the two ends of each connecting rod are parallel to each other and perpendicular to the axis of the lead screw pair; the adjusting screw rod is slidably connected with the supporting seat and can linearly move relative to the supporting seat, and the sliding directions point to the same circle center; the barrel inner hole supporting plate is rotationally connected with the other end of the adjusting screw rod, and the axis of the rotationally connected rotating pair is parallel to the axis of the lead screw pair; and the plurality of cylinder body inner hole supporting plates form a round surface to abut against the cylinder body when extending out. The device is simple and quick to operate, time-saving and labor-saving.

Description

Technical Field

[0001] The utility model belongs to the field of machine tool fixtures, in particular to a cylinder inner hole expansion and tightening device. Background Art

[0002] The ordinary tooling used in machining the outer circle of barrel-type (cylindrical, conical, etc.) workpieces is time-consuming and labor-intensive, and the barrel is easily deformed during clamping, which affects product quality and machining efficiency.

[0003] The application number is CN 109513960 A. A tightening device for processing thin-walled cylindrical parts roughly ensures the outer diameter of the support plate by adjusting the height of the screw rod, and accurately ensures the outer diameter of the support plate by adjusting the feed amount of the wedge block, thereby tightening the cylindrical parts. It has the characteristics of simple operation and high tightening accuracy, and is suitable for lathe processing thin-walled cylindrical parts. However, due to the limitations of its structure, each screw rod and adjustment wedge block need to be adjusted before and after each use, which is time-consuming, labor-intensive and inefficient. Utility Model Content

[0004] The utility model aims to provide a cylinder inner hole expansion device to solve the inconvenience problem in the prior art.

[0005] The technical solution to achieve the purpose of this utility model is:

[0006] A cylinder inner hole expansion device, comprising:

[0007] A fixing seat, used for fixing the drive unit;

[0008] A driving unit, used for driving the screw pair to move;

[0009] The lead screw pair is used as a transmission unit of the drive unit, and the lead screw is connected to the drive unit;

[0010] The nut connecting plate is connected with the nut of the lead screw pair;

[0011] A plurality of connecting rods, one end of the connecting rod is rotatably connected to the nut connecting plate, and the other end is rotatably connected to one end of the adjusting screw, and the rotating pairs rotatably connected at both ends of the connecting rod are parallel to each other and perpendicular to the axis of the screw pair;

[0012] The adjusting screw is slidably connected to the support base and can move linearly relative to the support base, and the sliding direction points to the same center of the circle;

[0013] The inner hole support plate of the cylinder is rotatably connected to the other end of the adjusting screw, and the rotation pair axis of the rotation connection is parallel to the axis of the lead screw pair;

[0014] When a plurality of inner hole support plates of the cylinder are extended, a circular surface is formed to press against the cylinder.

[0015] In a further embodiment, the driving unit adopts a worm gear reducer.

[0016] In a further embodiment, the nut connecting plate adopts a circular plate structure, the support seat adopts a circular ring structure, and the support seat and the nut connecting plate are cocentric.

[0017] In a further embodiment, the support seat is fixedly connected to the fixing seat via a plurality of connecting rods.

[0018] In a further embodiment, there are four connecting rods and eight connecting rods, the four connecting rods are evenly spaced between the eight connecting rods, and the connection position of the connecting rod and the support seat corresponds to the position of the linear bearing on the support seat.

[0019] In a further embodiment, the adjusting screw is slidably connected via a linear bearing support seat.

[0020] In a further embodiment, the adjusting screw is a telescopic rod.

[0021] In a further embodiment, a hinge seat is provided in the inner hole support plate of the cylinder, and the adjusting screw is connected to the hinge seat via a rotating shaft.

[0022] In a further embodiment, the worm gear reducer is connected to a handwheel or a motor.

[0023] Compared with the prior art, the utility model has the following significant advantages:

[0024] The device can conveniently and quickly tighten the inner hole of the cylinder and has a mechanical self-locking function; the outer dimensions of the retracted state are smaller than those of the extended state, so it is easy to use; the operation is simple, fast, and time-saving and labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the tensioning device in the extended state.

[0026] Figure 2 It is a schematic diagram of the structure of the tensioning device in the retracted state. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] Combination Figure 1 , Figure 2, a cylinder bore expansion device of this embodiment includes a fixed seat 1, a worm gear reducer 2, a nut connecting plate 3, a connecting rod 4, an adjusting screw 5, a linear bearing 6, a cylinder bore support plate 7, a lead screw pair 8, a support seat 9, a connecting rod 10, and a cylinder bore support plate 11. The worm gear reducer 2 is fixed on the fixed seat 1, the worm gear is connected to the lead screw of the lead screw pair 8, the nut connecting plate 3 is connected to the nut of the lead screw pair 8, and the nut moves on the lead screw, and the support seat 9 is fixed to the fixed seat 1. In this embodiment, the nut connecting plate 3 adopts a circular plate structure, and the support seat 9 adopts a circular ring structure. The support seat 9 and the nut connecting plate 3 are cocentric, and the support seat 9 is fixed to the fixed seat 1 through a plurality of connecting rods 10;

[0029] One end of the connecting rod 4 is rotationally connected to the nut connecting plate 3, and the other end is rotationally connected to one end of the adjusting screw 5, and the rotation pairs of the two ends of the connecting rod 4 are parallel to each other, and the axis of the rotation pair is perpendicular to the axis of the screw pair 8. The linear bearing 6 is fixed on the support seat 9, and the adjusting screw 5 passes through the linear bearing 6 and can slide axially on the linear bearing 6; the sliding direction passes through the center of the nut connecting plate 3. The other end of the adjusting screw 5 is rotationally connected to the inner hole support plate 11 of the cylinder, and the axis of the rotation pair of the rotation connection is parallel to the axis of the screw pair 8. Specifically, a hinge seat can be set in the inner hole support plate 11 of the cylinder, and the adjusting screw 5 is connected to the hinge seat through a rotating shaft. The adjusting screw is a telescopic rod and can adjust the length.

[0030] In this embodiment, there are four connecting rods 10 and eight connecting rods 4. The four connecting rods 10 are evenly spaced between the eight connecting rods 4. The connection position between the connecting rod 10 and the support seat 9 corresponds to the position of the linear bearing 6 on the support seat 9.

[0031] The worm gear reducer 2 of this embodiment can be connected to a handwheel or a motor, which drives the cylinder inner hole support plate 11 to move axially along the adjusting screw 5 through the worm gear reducer 2, the screw pair 8, the nut connecting plate 3, the connecting rod 4 and the adjusting screw 5, so that a plurality of cylinder inner hole support plates 11 form a circular surface to press against the cylinder when extended or to be in a contracted state when retracted; adjacent connecting rods 4 and adjusting screws 5 are respectively set to specific lengths, so that adjacent cylinder inner hole support plates 11 can be staggered but not interfere with each other when retracted, and can simultaneously press against the cylinder when extended.

Claims

1. A cylinder inner hole expansion device, characterized in that: include: A fixing seat, used for fixing the drive unit; A driving unit, used for driving the screw pair to move; The lead screw pair is used as a transmission unit of the drive unit, and the lead screw is connected to the drive unit; The nut connecting plate is connected with the nut of the lead screw pair; A plurality of connecting rods, one end of the connecting rod is rotatably connected to the nut connecting plate, and the other end is rotatably connected to one end of the adjusting screw, and the rotating pairs rotatably connected at both ends of the connecting rod are parallel to each other and perpendicular to the axis of the screw pair; The adjusting screw is slidably connected to the support base and can move linearly relative to the support base, and the sliding direction points to the same center of the circle; The inner hole support plate of the cylinder is rotatably connected to the other end of the adjusting screw, and the rotation pair axis of the rotation connection is parallel to the axis of the lead screw pair; When a plurality of inner hole support plates of the cylinder are extended, a circular surface is formed to press against the cylinder.

2. The cylinder inner hole expansion device according to claim 1, characterized in that: The driving unit adopts a worm gear reducer.

3. The cylinder inner hole expansion device according to claim 1, characterized in that: The nut connecting plate adopts a circular plate structure, the support seat adopts a circular ring structure, and the support seat and the nut connecting plate share the same center.

4. The cylinder inner hole expansion device according to claim 1, characterized in that: The support seat is fixedly connected to the fixing seat via a plurality of connecting rods.

5. The cylinder inner hole expansion device according to claim 4, characterized in that: There are four connecting rods and eight connecting rods, and the four connecting rods are evenly spaced between the eight connecting rods. The connection position between the connecting rod and the support seat corresponds to the position of the linear bearing on the support seat.

6. The cylinder bore expansion device according to claim 1, characterized in that: The adjusting screw is slidably connected via a linear bearing support seat.

7. The cylinder bore expansion device according to claim 1, characterized in that: The adjusting screw rod is a telescopic rod.

8. The cylinder bore expansion device according to claim 1, characterized in that: A hinge seat is arranged in the inner hole support plate of the cylinder, and the adjusting screw is connected to the hinge seat through a rotating shaft.

9. The cylinder inner hole expansion device according to claim 2, characterized in that: The worm gear reducer is connected to a hand wheel or a motor.

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