Crankshaft scissors clamping and positioning device

Abstract

A crankshaft scissor clamping and positioning device comprises a positioning mechanism, a clamping mechanism, an air cylinder mechanism and a sensor mechanism, the positioning mechanism comprises two support check blocks located on a positioning bottom plate, the upper portions of the support check blocks are of a V-shaped groove structure used for positioning a workpiece crankshaft, and the clamping mechanism comprises a scissor clamping device extending out of the middle of the positioning bottom plate. The air cylinder mechanism comprises an air cylinder connecting frame and a fixed guide air cylinder connected to the lower end of the air cylinder connecting frame, and the sensor mechanism comprises a clamping position sensor and an opening position sensor. The device is reasonable in structure and simple to operate. A planar connecting rod mechanism is applied to realize quick clamping and positioning of a workpiece; the fixed guide air cylinder adopts 40-cylinder-diameter double guidance, the push-pull capability and the position precision of the mechanism are improved, and movable joint points are matched with oil-free bushings and pin shafts, so that the maintenance workload and the maintenance cost are reduced while the normal operation of the mechanism is ensured; the supporting check block is of a V-shaped structure, a workpiece is accurately positioned, the hardness of the contact face is treated to be HRC52, good abrasion resistance is achieved, and therefore the effect of long service life is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile crankshaft processing and production, in particular to a crankshaft scissors clamping and positioning device used for crankshaft deburring and cleaning. Background Art

[0002] The clamping mechanism is one of the most important mechanisms in the tooling of cleaning machine production and is widely used. The clamping mechanism is generally tightened by thread. Although this structure is simple and reliable, the screw stroke is very long when tightening and disassembling the workpiece, which is time-consuming and laborious. In order to improve labor productivity and meet the company's "modernized" production needs, it is necessary to design a quick clamp, that is, a mechanism that can clamp quickly when clamping and release quickly when disassembling the workpiece. This has become an important topic in tooling design. Utility Model Content

[0003] The utility model aims to solve the problems existing in the prior art and provide a crankshaft scissors clamping and positioning device which can realize automatic and rapid clamping and positioning of a crankshaft workpiece.

[0004] The technical solution adopted by the utility model to achieve the above-mentioned purpose is: a crankshaft scissors clamping and positioning device, characterized in that it includes a positioning mechanism, a clamping mechanism, a cylinder mechanism and a sensor mechanism connected in sequence from top to bottom, the positioning mechanism includes two support blocks located on the positioning base plate, the upper part of the support block is a V-groove structure for positioning the workpiece crankshaft, the clamping mechanism includes a scissors clamping device extending from the middle of the positioning base plate, the scissors clamping device is connected to the positioning base plate through a pin support seat, and the two scissors blocks at the upper end are used to clamp the middle part of the workpiece crankshaft, the cylinder mechanism includes a cylinder connecting frame connected to the lower end of the scissors clamping device and a fixed guide cylinder connected to the lower end of the cylinder connecting frame, the extension and retraction of the fixed guide cylinder drive the opening and clamping state of the scissors clamping device, and the sensor mechanism includes a clamping position sensor and an opening position sensor connected to the bottom of the fixed guide cylinder, which are used to receive retraction and extension point signals of the fixed guide cylinder.

[0005] The scissors clamping device includes two movable connecting plates and two shear blocks connected thereto, a gap of 0.5 mm is left between the two movable connecting plates, the lower ends are connected to the upper end of the cylinder connecting frame through an anti-rotation baffle, the upper ends of the two movable connecting plates are respectively connected to the shear blocks through anti-rotation baffles, the upper ends of the two shear blocks extend from the middle of the positioning base plate, and the intersection of the two is connected through an anti-rotation baffle.

[0006] All the movable joints of the scissors clamping device are composed of oil-free bushings and pins.

[0007] The hardness of the contact surface between the V-groove structure and the workpiece crankshaft is HRC52.

[0008] The fixed guide cylinder adopts a 40 cylinder diameter double guide.

[0009] The utility model is designed based on the analysis of the crankshaft workpiece structure, with reasonable structure and simple operation. The plane connecting rod mechanism is used to realize the function of fast clamping and positioning of the workpiece; the fixed guide cylinder adopts 40 cylinder diameter double guide, which increases the push-pull ability and position accuracy of the mechanism, and the movable joints are all used with oil-free bushings and pins to ensure the normal operation of the mechanism while reducing the maintenance workload and maintenance costs; the support block adopts a V-shaped structure and precise positioning of the workpiece, and the contact surface hardness is processed to HRC52, which has good wear resistance and achieves a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structure and operation of the utility model;

[0011] Figure 2 for Figure 1 Left view of

[0012] Figure 3 for Figure 1 X2-X2 sectional view (shear block opened state);

[0013] Figure 4 for Figure 1 X2-X2 sectional view (shear block clamped state);

[0014] Figure 5 for Figure 1 Axonometric view of

[0015] Figure 6 for Figure 2 X1-X1 cross-sectional view;

[0016] Figure 7 This is a schematic diagram of the support block structure of the utility model;

[0017] In the figure: 1. Positioning base plate; 2. Support block; 3. Workpiece crankshaft; 4. Anti-rotation baffle; 5. Pin support seat; 6. Shear block 1; 7. Shear block 2; 8. Active connecting plate 1; 9. Active connecting plate 2; 10. Cylinder connecting frame; 11. Fixed guide cylinder; 12. Clamping position sensor; 13. Opening position sensor; 14. Pin; 15. Oil-free bushing. DETAILED DESCRIPTION

[0018] Example 1

[0019] like Figure 1-Figure 7 The crankshaft scissors clamping and positioning device shown in the figure comprises a positioning mechanism, a clamping mechanism, a cylinder mechanism and a sensor mechanism connected in sequence from top to bottom. The positioning mechanism comprises two support blocks 2 located on a positioning base plate 1, as shown in FIG. Figure 6 As shown, the upper part of the support block 2 is a V-groove structure for positioning the workpiece crankshaft 3, the clamping mechanism includes a scissors clamping device extending from the middle of the positioning base plate 1, the scissors clamping device is connected to the positioning base plate 1 through a pin support seat 5, and the two scissors blocks at the upper end are used to clamp the middle of the workpiece crankshaft 3, the cylinder mechanism includes a cylinder connecting frame 10 connected to the lower end of the scissors clamping device and a fixed guide cylinder 11 connected to the lower end of the cylinder connecting frame 10, the extension and retraction of the fixed guide cylinder 11 drives the opening and clamping state of the scissors clamping device, and the sensor mechanism includes a clamping position sensor 12 and an opening position sensor 13 connected to the bottom of the fixed guide cylinder 11, which are used to receive the retraction and extension point signals of the fixed guide cylinder 11.

[0020] The scissors clamping device includes two movable connecting plates and two shear blocks connected thereto, a gap of 0.5 mm is left between the two movable connecting plates, the lower ends are connected to the upper end of the cylinder connecting frame 10 through an anti-rotation baffle 4, the upper ends of the two movable connecting plates are respectively connected to the shear blocks through anti-rotation baffles 4, the upper ends of the two shear blocks extend from the middle of the positioning base plate 1, and the intersection of the two is connected through the anti-rotation baffle 4.

[0021] All the movable joints of the scissors clamping device are composed of oil-free bushings 15 and pins 14.

[0022] The contact surface hardness between the V-groove structure and the workpiece crankshaft 3 is HRC52.

[0023] The fixed guide cylinder 11 adopts a 40 cylinder diameter double guide.

[0024] Example 2

[0025] The working process of the utility model is as follows:

[0026] Step 1, fix the cylinder connecting frame 10 on the fixed guide cylinder 11;

[0027] Step 2, the movable connecting plate 1 8 and the movable connecting plate 2 9 are connected together with a pin 14 and four oil-free bushings 15 to ensure the concentricity between the parts. At the same time, a 0.5mm gap is left between the movable connecting plate 1 8 and the movable connecting plate 2 9. The anti-rotation baffle 4 is connected to the limit pin 14 on both sides of the cylinder connecting frame 10 to prevent the pin 14 from rotating;

[0028] Step 3, the connection principle between the shear block 1 6 and the shear block 2 7 is the same as step 2, and the whole set of scissors clamping and positioning mechanism uses the principle of a planar linkage mechanism;

[0029] Step 4, the positioning base plate 1 is fixed, and in actual application, it is fixed on a platform or a rack, and two support blocks 2 are fixed on the positioning base plate 1, and the workpiece crankshaft 3 falls on the support blocks 2. The V-shaped iron principle is used, which has better stability and load-bearing capacity, and is very suitable for round and square cross-section workpieces, and is also replaceable;

[0030] Step 5, shear block 1 6, shear block 2 7, movable connecting plate 1 8 and movable connecting plate 2 9 are movable, and the extension and retraction of the fixed guide cylinder 11 drive the opening and clamping state of the shear block 1 6 and the shear block 2 7. The extension and retraction point signal of the fixed guide cylinder 11 is transmitted through the clamping position sensor 12, and the opening position sensor 13 detects the telescopic rod to determine the opening and clamping state of the tooling fixture.

Claims

1. Crankshaft scissors clamping and positioning device, characterized in that: It includes a positioning mechanism, a clamping mechanism, a cylinder mechanism and a sensor mechanism which are connected in sequence from top to bottom. The positioning mechanism includes two support blocks located on a positioning base plate. The upper portion of the support blocks is a V-groove structure for positioning a workpiece crankshaft. The clamping mechanism includes a scissors clamping device extending from the middle portion of the positioning base plate. The scissors clamping device is connected to the positioning base plate via a pin support seat. The two scissors blocks at the upper end are used to clamp the middle portion of the workpiece crankshaft. The cylinder mechanism includes a cylinder connecting frame connected to the lower end of the scissors clamping device and a fixed guide cylinder connected to the lower end of the cylinder connecting frame. The extension and retraction of the fixed guide cylinder drive the opening and clamping states of the scissors clamping device. The sensor mechanism includes a clamping position sensor and an opening position sensor connected to the lower portion of the fixed guide cylinder, which are used to receive retraction and extension point signals of the fixed guide cylinder.

2. The crankshaft scissors clamping and positioning device according to claim 1, characterized in that: The scissors clamping device includes two movable connecting plates and two shear blocks connected thereto, a gap of 0.5 mm is left between the two movable connecting plates, the lower ends are connected to the upper end of the cylinder connecting frame through an anti-rotation baffle, the upper ends of the two movable connecting plates are respectively connected to the shear blocks through anti-rotation baffles, the upper ends of the two shear blocks extend from the middle of the positioning base plate, and the intersection of the two is connected through an anti-rotation baffle.

3. The crankshaft scissors clamping and positioning device according to claim 2, characterized in that: All the movable joints of the scissors clamping device are composed of oil-free bushings and pins.

4. The crankshaft scissors clamping and positioning device according to any one of claims 1 to 3, characterized in that: The hardness of the contact surface between the V-groove structure and the workpiece crankshaft is HRC52.

5. The crankshaft scissors clamping and positioning device according to any one of claims 1 to 3, characterized in that: The fixed guide cylinder adopts a 40 cylinder diameter double guide.

Images