CN204902746U - A detect auxiliary device that is used for a bolt word groove symmetry - Google Patents

Abstract

This patent discloses an auxiliary device for detecting the symmetry of a bolt slot, which includes a cylinder, and the inside of the cylinder includes a counterbore at the upper part and an inner hole at the lower part, and the inner diameter of the counterbore is larger than the inner diameter of the inner hole ; The inner diameter of the counterbore is 1.2 to 1.5 times the diameter of the head of the bolt head, and the inner hole and the screw rod have a clearance fit, and the minimum clearance is 0 to 0.05 mm. The utility model has the advantages of simple structure, convenient processing, and can be integrally formed mechanically. It can be used together with corresponding bolts. Accurate, high practicability, suitable for popularization.

Description

Auxiliary device for detection of symmetry of bolt slot

technical field

The utility model relates to the field of mechanical processing and manufacturing, in particular to an auxiliary device for detecting the symmetry of a slot of a bolt. Background technique

Slotted countersunk head bolts, slotted hex head bolts, after the head is processed with a slot, it is necessary to detect the symmetry of the slot relative to the rod. Or the minimum distance between two planes of the axis line, which belongs to the positioning error in the position error.

When measuring, generally use a special plug to insert into the keyway to be tested, level it in one direction, record the reading with the dial indicator, turn over 180 degrees, and write down the reading again with the dial indicator for leveling as above, the difference between the two times is asymmetric value. Taking the slotted hexagonal head bolt as an example, the specific operation process is as follows: First, put a V-shaped iron on the flat plate, put the slotted hexagonal head bolt on the V-shaped iron, and put the plug into the slotted head of the bolt. Put the meter stand on the platform, install the dial gauge on the meter stand, level the position, and record the reading; turn the slotted hex head bolt 180 degrees, measure the reading according to the above method, the difference between the two readings The value is the symmetry of the slot 1 relative to the screw reference. Due to the structural relationship of the parts, a variety of tools are required to be used together, which brings troublesome measurement and slow speed.

Utility model content

The purpose of the utility model is to provide an auxiliary device, which solves the problem that in the prior art, multiple tools need to be used together to bring trouble to the measurement and the speed is slow.

In order to achieve the above object, the utility model provides the following technical solution: the auxiliary device for detecting the symmetry of the slotted groove of the bolt includes a cylinder, and the interior of the cylinder includes a counterbore and a counterbore located on the top on the same central axis. In the lower inner hole, the counterbore communicates with the inner hole; the inner diameter of the counterbore is larger than the inner diameter of the inner hole; the inner diameter of the counterbore is 1.2 to 1.5 times the diameter of the head of the bolt.

The working principle and beneficial effects of the utility model: the auxiliary device for detecting the symmetry of the slot of the bolt includes a cylinder, which is the main structure of the auxiliary detection tool, and the inside of the cylinder includes a counterbore on the upper part and The inner hole of the lower part is cut along the central plane of the cylinder, and the inner section of the cylinder is "T" shaped. The utility model is used together with the corresponding bolts, and has the advantages of small size, light weight, and convenient portability. This method only needs to use two tools when measuring the symmetry, and the measurement process is simple, convenient and fast. At the same time, the measurement error is small and the data Accurate, high practicability, suitable for popularization.

When using the utility model, put the screw rod of the bolt into the inner hole of the cylinder, sink the bolt head into the counterbore, adjust the position of the bolt so that the opening of the slot is perpendicular to the outer cylindrical surface of the cylinder, and move the vernier caliper Increase the distance between the main ruler and the vernier, place the object to be measured between the two clamping feet, hold the utility model with one hand, and at the same time put the thumb on the main ruler, and place the clamping feet on the main ruler Close to the edge of the slot, move the vernier towards the main ruler with the other hand. When the vernier moves to the outer cylindrical surface of cylinder 1, stop moving and fine-tune the vernier caliper. When the object under test and the measuring jaw When they are close to each other, record the reading to obtain d ₁ , measure the distance d ₂ from the other groove side of the slot to the outer cylindrical surface of the opposite surface of the cylinder in the same way, and compare the values of the two measured data d ₁ -d ₂ That is, the symmetry of the slot relative to the screw reference.

Further, the outer cylindrical surface of the cylinder is smooth, and the distance from the outer cylindrical surface to the inner surface of the counterbore is equal everywhere, eliminating errors in measuring d ₁ and d ₂ and making the obtained symmetry more accurate; the top of the cylinder Equipped with a scale line to facilitate the measurement of the vernier caliper, while ensuring the accuracy of the measurement.

Further, the inner hole and the screw are in clearance fit, the inner hole and the screw are in clearance, the minimum clearance is 0-0.05mm, to ensure that the screw of the bolt can enter and exit the inner hole smoothly, and at the same time there is no redundant clearance, ensuring the axis of the screw The center line coincides with the axis line of the inner hole to provide an accurate reference line for measurement; the length of the inner hole is smaller than the length of the screw, and the use of materials is minimized to reduce the processing cost under the condition of ensuring the position of the reference line is accurate.

Further, the junction between the counterbore and the inner hole is provided with a chamfer, so that the bolt can enter the inner hole more smoothly.

Description of drawings

Fig. 1 is the perspective view of the utility model for the detection auxiliary device of the symmetry of the slot of the bolt;

Fig. 2 is a sectional view of the utility model for the detection auxiliary device for the symmetry of the slot of the bolt;

Fig. 3 is a top view of the utility model for the detection auxiliary device for the symmetry of the slot of the bolt;

Fig. 4 is a structural schematic diagram of a slotted hex head bolt;

Fig. 5 is a schematic diagram of measuring the symmetry of a slot of a bolt using a dial gauge in the prior art;

Fig. 6 is a schematic diagram of an application embodiment of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail:

Reference signs: cylinder 1, counterbore 2, inner hole 3, bolt 4, V-shaped iron 5, flat plate 6, feeler gauge 7, meter frame 8, dial indicator 9, vernier caliper 10, main ruler 11, vernier 12, Scale line 101, slot 401, bolt head 402, screw rod 403.

As shown in Figures 1 to 3, a detection auxiliary device for the symmetry of a slotted groove of a bolt includes a cylinder 1, and the inside of the cylinder 1 includes a counterbore 2 on the same central axis and located on the upper part and The lower inner hole 3 and the counterbore 2 communicate with the inner hole 3; the inner diameter of the counterbore 2 is larger than the inner diameter of the inner hole 3;

As shown in FIG. 4 , the bolt 4 includes a bolt head 402 and a screw rod 403 , and a slot 401 is provided on the top of the bolt head 402 .

As shown in Figure 5, when the existing technical means measures the symmetry of the slot 401, it usually operates like this: first place a V-shaped iron 5 on the flat plate 6, put the screw rod 403 of the bolt 4 into the V-shaped iron 5 , keep it level, put the feeler gauge 7 into the slot of the bolt 4, place the meter frame 8 on the flat plate 6, install the dial indicator 9 on the movable end of the meter frame 8, level it at this position, and record Read t ₁ ; then turn the bolt 4 180 degrees, measure the reading t ₂ according to the above method, the difference between the two readings (t ₁ -t ₂ ) is the symmetry of the slot 1 relative to the screw 403 reference. However, using the above-mentioned measuring method requires multiple tools to be used together, and the measurement is cumbersome and slow.

As shown in Figure 6, when using a detection auxiliary device for the symmetry of a bolt groove of the present invention, first put the screw rod 403 of the bolt 4 into the inner hole 3 of the cylinder 1, and the bolt head 402 sinks into it. In the counterbore 2, adjust the position of the slot 401 so that the opening of the slot 401 is vertical or parallel to the scale line 101, move the vernier on the vernier caliper 10, increase the distance between the main chi 11 and the vernier 12, and then The object to be tested is located between the two clamping feet, hold the utility model with one hand, and at the same time put the thumb on the main ruler 11, and put the clamping feet on the main ruler 11 against the edge of the slot 401, and the other Move the vernier 12 with one hand towards the main scale 11. When the vernier 12 moves to the point where the outer cylindrical surface of the cylinder 1 is perpendicular to the scale line 101, stop moving, fine-tune the vernier caliper 10 to ensure the measurement accuracy, and record the reading to obtain d ₁ . Use the same method to measure the distance d 2 from the other side of the slot 401 to the outer cylindrical surface on the opposite side of the cylinder 1, and the value of the two measurement data d ₁ -d ₂ is the distance d ₂ between the slot 401 and the screw 403 The symmetry of the benchmark, this method only needs to use two tools when measuring the symmetry, the measurement process is convenient and fast, and the practicability is high, which is suitable for popularization and use.

The working principle and beneficial effects of the utility model: a detection auxiliary device for the symmetry of the bolt groove, including a cylinder 1, the cylinder 1 is the main structure of the detection auxiliary tool, and the inside of the cylinder 1 includes a The counterbore 2 on the upper part and the inner hole 3 on the lower part are cut along the central plane of the cylinder 1, and the inner section of the cylinder is in the shape of a "T". Cooperate with the screw 403 clearance, the minimum clearance is 0 ~ 0.05mm, to ensure that the screw 403 can enter and exit the inner hole smoothly, and at the same time there is no redundant clearance, to ensure that the axis line of the screw 403 coincides with the axis line of the inner hole 3, to provide measurement An accurate baseline. The utility model is matched with the corresponding bolt 4 and has the characteristics of small size, light weight, and convenient portability.

The above is only the preferred implementation of the present utility model, it should be pointed out that for those skilled in the art, without departing from the concept of the present utility model, some deformations and improvements can also be made, and these should also be regarded as The protection scope of the utility model, these all can not affect the effect that the utility model implements and the practicability of the patent.

Claims (4)

1. for the detection servicing unit of bolt flat recess symmetry, comprise right cylinder, it is characterized in that: described cylindrical inside includes and is on same central axis, superposed counterbore and the endoporus being positioned at bottom, counterbore communicates with endoporus, and the internal diameter of counterbore is greater than the internal diameter of endoporus; Described counterbore internal diameter is 1.2 ~ 1.5 times of bolt head head diameter.

2. as claimed in claim 1 for the detection servicing unit of bolt flat recess symmetry, it is characterized in that: described cylindrical external cylindrical surface is smooth, cylindrical top is provided with scale mark simultaneously.

3., as claimed in claim 1 for the detection servicing unit of bolt flat recess symmetry, it is characterized in that: the length of endoporus is less than the length of screw rod.

4., as claimed in claim 1 for the detection servicing unit of bolt flat recess symmetry, it is characterized in that: described counterbore and endoporus joint are provided with chamfering.