CN202162619U - Counterweight structure for grouped machining fixtures - Google Patents

Abstract

The utility model relates to a counterweight structure for grouped machining fixtures, which comprises a counterweight body and two slotted holes arranged side by side. The counterweight structure is characterized in that a semicircular screw hole and a square slotted hole are integrated to form each slotted hole, and the length of a side of each square slotted hole is between the diameter of an internal tangent circle and the diameter of an outer tangent circle of each locking hexagonal nut. The counterweight structure has the advantages of reasonable design, simple structure, convenience in assembly and replacement and safety in service. The slotted holes match with the hexagonal nuts, accordingly, replacement operation is convenient, and operational safety is ensured.

Description

A kind of structure of counterweight block of fixture for group vehicle

Technical field:

The utility model belongs to the field of lathe accessories, in particular to the improvement of a safe and easy-to-install group vehicle fixture counterweight structure.

Background technique:

Turning fixtures are often used when turning workpieces in batches. The turning fixtures rotate together with the spindle of the lathe. Due to the shape of the workpiece and its positioning and clamping requirements, the overall structure of the fixture is generally unbalanced. During production and processing, due to the action of centrifugal force, the adverse consequence of imbalance is that it will cause vibration, which affects the machining accuracy and surface roughness of the workpiece, and aggravates the wear of the machine tool spindle and bearings. For example, the angle iron lathe fixture, because its positioning device and other components are always installed on one side of the spindle axis, the unbalance phenomenon is the most serious. One of the methods to solve the unbalance of the lathe fixture is to set the counterweight. As shown in Figure 1, the vehicle fixture 1 and the counterweight 2.

There are two forms of setting the counterweight: if a jig is only used to process one type of workpiece, then the set counterweight can be in a fixed form; if the jig needs to be used to process a group of workpieces , because the processed workpieces are in series, and their shapes and weights are different, the weight of the counterweight should also be different. The usual solution is to design several counterweights with the same shape but different thicknesses, so that the number of counterweights can be increased or decreased according to the requirements of different workpieces, so as to achieve the balance of the fixture.

The counterweight set on the vehicle fixture is required to be safe and easy to fix. Especially when the counterweights of the clamps of the group of vehicles are arranged, due to the requirement of increasing the number of counterweights, it is required to be easy to disassemble, which requires an improved design of the currently commonly used counterweight structure. At present, the common counterweight structure always has the following forms:

(1) As shown in Figure 2, there are two long open slots 21 on the counterweight 2. When fixing the counterweight 2, the two open long slots 21 can be inserted into the two screw rods fixed on the vehicle fixture, and then locked. Tighten the hex nut 3 on the screw rod. This structure is easy to assemble and disassemble, but it enhances the simplicity but ignores the more important safety. During processing, if the hex nut on the screw is loose, the counterweight may fly out and hurt people under the action of centrifugal force. .

(2) As shown in Figure 3, only two through holes 22 are processed on the counterweight 2. When fixing the counterweight 2, first loosen the hex nut 3 on the screw rod, and then put the counterweight 2 into the Screw, and then hex nut 3. This structure has sufficient safety, but when increasing or decreasing the quantity of counterweights every time, the hex nut 3 must be completely removed, which loses its simplicity.

比六角螺母3的外接圆直径e大2-3mm，固定配重块时，可把大孔对准带六角螺母3的锁紧螺杆套下，再移动配重块2，小孔套紧螺杆，然后锁紧六角螺母3。这种结构也有较好的简便性，但还是存在安全隐患，因为大孔比六角螺母3的外径大，如果六角螺母3松了，配重块还是有脱出的可能。(3) As shown in Figure 4, two holes 23 with different diameters are processed on the counterweight 2, and the diameter of the small hole is Generally 0.5-1mm larger than the diameter of the locking screw, the diameter of the large hole

It is 2-3mm larger than the diameter e of the circumscribed circle of the hex nut 3. When fixing the counterweight, the large hole can be aligned with the locking screw with the hex nut 3, and then the counterweight 2 can be moved to tighten the screw through the small hole. Then tighten the hex nut 3. This structure also has better simplicity, but there is still a potential safety hazard, because the large hole is larger than the outer diameter of the hexagon nut 3, if the hexagon nut 3 is loose, the counterweight still has the possibility of coming out.

How to overcome the deficiencies in the prior art and design a counterweight that is both convenient to replace and safe to use becomes the object of study of the present invention.

Invention content:

The utility model aims at overcoming the design defect of the existing counterweight, and designs a group of vehicle fixture counterweight structure in which the slot hole only allows locking hex nuts to be inserted at a specific angle.

The technical solution of the utility model is realized in the following way: a counterweight structure of a group vehicle fixture, including a counterweight body and two slotted holes arranged side by side, which is characterized in that the slotted holes are connected by a semicircular screw hole and a square slotted hole. It is made of a solid body, and the side length of the square slot hole is between the diameters of the inscribed circle and the circumscribed circle of the locking hexagon nut. When replacing the counterweight, you only need to adjust the direction of the two hexagon nuts to be consistent, then you can take it out or put it in, and then tighten the nuts. During operation, even if the hexagon nuts are loosened by vibration, as long as the two hexagon nuts are not broken Vibrating to the same specific angle ensures that the counterweight does not fly out or fall out.

The counterweight has a circular arc structure, the semicircular screw hole of the slot faces the chord side, the square slot faces the arc side, and the two square slots are parallel to each other. When the counterweight rotates at a high speed, its stress point is on one side of the semicircular screw hole, and the counterweight cannot be vibrated or shaken off at this positioning point.

The utility model has the characteristics of reasonable design, simple structure, convenient assembly and replacement, and safe use. The combination of the slotted hole and the hex nut not only facilitates the replacement operation, but also ensures the safety during processing.

Description of drawings:

Below in conjunction with specific legend the utility model is further described:

Figure 1 Stereoscopic schematic diagram of the vehicle fixture

Fig. 2 Existing counterweight block-structural schematic diagram

Fig. 3 Schematic diagram of structure of existing counterweight block 2

Fig. 4 Schematic diagram of the three structures of the existing counterweight

Fig. 5 three-dimensional schematic diagram of counterweight of the utility model

Figure 6 is a diagram of the state of use of the counterweight of the utility model

in

1-car fixture 2-counterweight 21-opening long slot

22-through hole 23-hole 24-semi-circular screw hole

25-square slot 3-hex nut

Detailed ways:

Referring to Fig. 5 and Fig. 6, the structure of the counterweight of the group vehicle fixture includes the body of the counterweight 2 and two slotted holes arranged side by side. The side length of the square slot hole 25 is between the diameter of the inscribed circle and the circumscribed circle of the locked hex nut 3, and is closer to the diameter of the inscribed circle.

The counterweight 2 is a circular arc structure, the semicircular screw hole 24 of the slot is towards the chord side, the square slot 25 is towards the arc side, and the two square slots 25 are parallel to each other, which is not only convenient for replacement and adjustment, but also the counterweight 2. Under the action of centrifugal force, there is a tendency to move outwards, and the screw rods run towards the semicircular screw hole 24 side relative to each other, which is safer.

Claims (2)

1. a vehicle clamper counterweight block structure in groups comprises balancing weight body and two slotted eyes that offer side by side, it is characterized in that slotted eye is formed by semicircle screw hole and square groove hole disjunctor, and the length of side in square groove hole is between the inscribed circle and circumcircle diameter of locking hex nut.

2. a kind of counterweight block structure of vehicle clamper in groups according to claim 1 is characterized in that balancing weight is an arc structure, and the semicircle screw hole of slotted eye is towards string one side, and the square groove hole is towards arc one side, and two square groove holes are parallel to each other.

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