Micrometer head for fine measurement

Abstract

The micrometer head comprises a rotating cylinder, a micrometer screw, a micrometer nut, a vernier seat, a measuring rod, a positioning element, a guide sleeve and a pressure spring, wherein the rotating cylinder is fixedly connected with the rear end of the micrometer screw; the guide sleeve is fixedly connected with the vernier seat, the measuring rod is movably arranged on the guide sleeve, the rear end of the measuring rod is located in the guide sleeve, and the two ends of the pressure spring sleeve abut against the measuring rod and the guide sleeve respectively so as to provide acting force towards the interior of the guide sleeve for the measuring rod. The micrometric device is characterized in that the micrometric nut is fixedly connected with the guide sleeve, the micrometric screw is in threaded connection with the micrometric nut, and the front end of the micrometric screw is located in the guide sleeve. According to the micrometer head, the micrometer nut is fixed on the guide sleeve, so that coaxial movement of the micrometer screw and the measuring rod can be ensured, and the measuring precision is improved.

Description

Technical Field

[0001] The utility model relates to the field of micrometers, in particular to a micrometer head for precise measurement. Background Art

[0002] A micrometer, also known as a screw gauge, is a more precise tool for measuring length than a vernier caliper. It can be used to measure precision parts of watches, the wall thickness and outer diameter of pipes, and small grooves, such as the groove diameter of drill bits, end mills, and even-groove taps, as well as the root circle diameter of watch gears. It can measure length accurately to 0.01 mm and has a measurement range of several centimeters, and is widely used in the field of precision machinery.

[0003] At present, in the micrometer head of some micrometers, a part of the measuring rod is movably arranged in the guide sleeve, and the other part of the measuring rod is located outside the guide sleeve for pressing the object to be measured. A spring is arranged in the guide sleeve, and the two ends of the spring are respectively abutted against the measuring rod and the guide sleeve. The guide sleeve is threadedly connected with the vernier seat, a micrometer nut is fixed in the vernier seat, and the micrometer screw is threadedly connected with the micrometer nut. When the micrometer screw rotates, it will move forward, thereby pushing the measuring rod forward.

[0004] However, as Figure 1 shown in the micrometer head of the prior art, since the measuring rod 9' and the micrometer nut 4' are respectively arranged in the guide sleeve 12' and the vernier seat 5', and the guide sleeve 12' is threadedly connected with the vernier seat 5', the coaxiality of the measuring rod 9' and the micrometer nut 4' cannot be guaranteed, which easily causes the advancing direction of the micrometer screw 3' to deviate, and is not coaxial with the advancing direction of the measuring rod 9', thereby generating a large error value and affecting the measurement accuracy of the micrometer. Summary of the Utility Model

[0005] As Figure 2 shown in the micrometer head of the prior art, the micrometer nut is arranged in the vernier seat. In order to overcome the disadvantages and deficiencies existing in the prior art, in the micrometer head of the present utility model, as Figure 4 shown, it can be clearly seen that the micrometer nut is arranged in the guide sleeve, which can ensure the coaxiality of the measuring rod and the micrometer nut, so that the micrometer screw moves coaxially with the measuring rod, thereby reducing the error generated by measurement and improving the measurement accuracy.

[0006] To achieve the above object, the present utility model provides a micrometer head for precise measurement, comprising: a rotating cylinder, a micrometer screw, a micrometer nut, a vernier seat, a measuring rod, a guide sleeve and a pressure spring. The rotating cylinder is fixedly connected to the rear end of the micrometer screw; the guide sleeve is fixedly connected to the vernier seat. The measuring rod is movably arranged in the guide sleeve and the rear end of the measuring rod is located inside the guide sleeve. Both ends of the pressure spring sleeve are respectively abutted against the measuring rod and the guide sleeve to provide a force towards the inside of the guide sleeve to the measuring rod; the micrometer nut is fixedly connected to the guide sleeve, the micrometer screw is screwed with the micrometer nut and the front end of the micrometer screw is located inside the guide sleeve.

[0007] Further, the micrometer head further comprises: a positioning pin. The vernier seat is provided with a first straight through hole, and the guide sleeve is provided with a second straight through hole. The positioning pin is inserted into the first straight through hole and the second straight through hole to fixedly connect the vernier seat and the guide sleeve.

[0008] Further, the micrometer head further comprises: a positioning screw. The vernier seat is provided with a first threaded hole, and the guide sleeve is provided with a second threaded hole. The positioning screw is threadedly connected to the first threaded hole and the second threaded hole to fixedly connect the vernier seat and the guide sleeve.

[0009] Further, the micrometer head further comprises: a guiding screw. The side surface of the measuring rod is provided with an axial guiding groove, and the guide sleeve is provided with a third threaded hole. The guiding screw is threadedly connected to the third threaded hole and inserted into the guiding groove.

[0010] Further, the micrometer head further comprises: a guiding pin. The side surface of the measuring rod is provided with an axial guiding groove, and the guide sleeve is provided with a third straight through hole. The guiding pin passes through the third straight through hole and is inserted into the guiding groove.

[0011] Further, the micrometer head further comprises: a first fixing screw. The rotating cylinder is provided with a transition hole, and the front end of the micrometer screw is provided with a fourth threaded hole. The fixing screw passes through the transition hole and is threadedly connected to the fourth threaded hole.

[0012] Further, the micrometer head further comprises: a second fixing screw. The micrometer nut is provided with a fifth threaded hole, and the guide sleeve is provided with a sixth threaded hole. The second fixing screw is threadedly connected to the fifth threaded hole and the sixth threaded hole.

[0013] Further, the measuring rod is provided with a pressing plate which abuts against the rear end of the pressure spring.

[0014] After adopting the above technical solution, the beneficial effects are as follows: The micrometer nut and the measuring rod are coaxially and fixedly arranged in the guide sleeve, ensuring that the advancing directions of the micrometer screw and the measuring rod are coaxial, reducing the error generated during measurement, and improving the measurement accuracy of the micrometer head. Brief Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of a micrometer head related to the prior art;

[0016] Figure 2 It is a partial schematic structural diagram of a micrometer head related to the prior art;

[0017] Figure 3 It is a schematic structural diagram of a micrometer head related to the present invention;

[0018] Figure 4 It is a partial schematic structural diagram of a micrometer head related to the present invention;

[0019] Figure 5 It is an exploded view of a micrometer head related to the present invention.

[0020] The reference numerals are: 1, the first fixing screw; 2, the rotating cylinder; 3, the micrometer screw; 4, the micrometer nut; 5, the vernier seat; 6, the first threaded hole; 7, the second threaded hole; 8, the positioning element; 9, the measuring rod; 10, the guide groove; 11, the pressure spring; 12, the guide sleeve; 13, the guiding element; 14, the third threaded hole; 15, the fourth threaded hole; 16, the pressing plate; 17, the second fixing screw; 18, the fifth threaded hole; 19, the sixth threaded hole. Detailed Description of the Embodiments

[0021] The technical solution of the present invention will be further described below through embodiments: Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0022] Such as Figure 1As shown in the figure, the utility model provides a micrometer head for fine measurement, which includes a rotating cylinder 2, a micrometer screw 3, a micrometer nut 4, a vernier seat 5, a positioning element 8, a measuring rod 9, a guide sleeve 12 and a pressure spring 11. The rotating cylinder 2 is fixedly connected to the rear end of the micrometer screw 3. The micrometer nut 4 is fixedly connected to the guide sleeve 12. The measuring rod 9 is movably arranged in the guide sleeve 12 and the rear end of the measuring rod 9 is located inside the guide sleeve 12. The positioning element 8 is inserted into the guide sleeve 12 and the vernier seat 5 along the radial direction to fixedly connect the guide sleeve 12 and the vernier seat 5. The micrometer screw 3 is threadedly connected to the micrometer nut 4 and the front end of the micrometer screw 3 is located inside the guide sleeve 12. The pressure spring 11 is sleeved on the measuring rod 9. The measuring rod 9 abuts against the rear end of the pressure spring 11, and the guide sleeve 12 abuts against the front end of the pressure spring 11, so as to provide a force acting towards the inside of the guide sleeve 12 to the measuring rod 9.

[0023] Wherein, the inner diameter of the rotating cylinder 2 is larger than the outer diameter of the vernier seat 5. The front end of the outer surface of the rotating cylinder 2 is marked with circumferential scale lines, and the outer surface of the vernier seat 5 is marked with axial scale lines. The reading method of this micrometer head is the same as that of the prior art and will not be elaborated here.

[0024] Although in this embodiment, the rear end of the guide sleeve 12 is inserted into the vernier seat 5, in other embodiments, it can also be that the front end of the vernier seat 5 is inserted into the guide sleeve 12, that is, the inner diameter of the rear end of the guide sleeve 12 is larger than the outer diameter of the front end of the vernier seat 5.

[0025] When using the micrometer head, the rotation of the rotating cylinder 2 drives the micrometer screw 3 to rotate, and through the cooperation of the micrometer screw 3 and the micrometer nut 4, the micrometer screw 3 moves axially. The measuring rod 9 is in contact with the front end of the micrometer screw 3. When the micrometer screw 3 moves forward, the measuring rod 9 moves forward along the moving direction of the micrometer screw 3 against the pressure spring 11. After the pressure spring 11 is compressed, it generates a reaction force to the measuring rod 9, making the measuring rod 9 closely adhere to the rear micrometer screw 3. When the micrometer screw 3 moves backward, the pressure spring 11 recovers, making the measuring rod 9 move backward to achieve reset.

[0026] Since the micrometer nut 4 is fixedly arranged in the guide sleeve 12, it can ensure the coaxial advancement of the micrometer screw 3 and the measuring rod 9, thus improving the measurement accuracy of the micrometer head and reducing the error generated during measurement.

[0027] Preferably, the side surface of the measuring rod 9 is provided with an axial guide groove 10, and the guide element 13 passes through the guide sleeve 12 and is inserted into the guide groove 10. When the measuring rod 9 moves forward, the bottom of the guide element 13 slides backward relative to the guide groove 10. The above structure can prevent the measuring rod 9 from rotating during axial movement, which is beneficial to reducing measurement errors.

[0028] In this embodiment, the positioning element 8 is a positioning screw. A first threaded hole 6 is provided on the cursor seat 5; a second threaded hole 7 is provided on the guide sleeve 12. The positioning element 8 is threadedly connected to both the first threaded hole 6 and the second threaded hole 7 at the same time. That is to say, the positioning element 8 forms a fixed connection with the cursor seat 5 and the guide sleeve 12 by means of a radial threaded connection.

[0029] In this embodiment, the guiding element 13 is a guiding screw. The guide sleeve 12 is provided with a third threaded hole 14, and the guiding element 13 is threadedly connected to the third threaded hole 14. That is to say, the guiding element 13 forms a fixed connection with the guide sleeve 12 by means of a radial threaded connection and is inserted into the guiding groove 10.

[0030] It is worth mentioning that although in this embodiment, both the positioning element 8 and the guiding element 13 are screws, in other embodiments, the positioning element 8 and the guiding element 13 can also be pins. Correspondingly, the cursor seat 5 can also be provided with a first through hole, and the guide sleeve 12 can also be provided with second and third through holes.

[0031] Preferably, the micrometer head further includes a first fixing screw 1. The rotating cylinder 2 is provided with a transition hole. One end of the micrometer screw 3 is provided with a fourth threaded hole 15, and the fixing screw 1 passes through the transition hole and is threadedly connected to the fourth threaded hole 15.

[0032] Preferably, the micrometer head further includes a second fixing screw 17. The micrometer nut 4 is provided with a fifth threaded hole 18, and the guide sleeve 12 is provided with a sixth threaded hole 19. The second fixing screw 17 is inserted into the fifth threaded hole 18 and the sixth threaded hole 19 and forms a tight fit.

[0033] Preferably, the measuring rod 9 is provided with a pressing plate 16, and the pressing plate 16 abuts against the rear end of the compression spring 11.

[0034] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A micrometer head for fine measurement, comprising: A rotating cylinder, a micrometer screw, a micrometer nut, a vernier seat, a measuring rod, a guide sleeve and a pressure spring, wherein the rotating cylinder is fixedly connected to the rear end of the micrometer screw; the guide sleeve is fixedly connected to the vernier seat, the measuring rod is movably arranged on the guide sleeve and the rear end of the measuring rod is located inside the guide sleeve, and the two ends of the pressure spring are respectively in contact with the measuring rod and the guide sleeve to provide a force to the measuring rod toward the inside of the guide sleeve; it is characterized in that the micrometer nut is fixedly connected to the guide sleeve, the micrometer screw is threadedly connected to the micrometer nut and the front end of the micrometer screw is located inside the guide sleeve.

2. A micrometer head for fine measurement according to claim 1, characterized in that: The micrometer head also includes: a positioning pin, the vernier seat is provided with a first straight through hole, the guide sleeve is provided with a second straight through hole, and the positioning pin is inserted into the first straight through hole and the second straight through hole to fix the vernier seat and the guide sleeve in connection.

3. A micrometer head for fine measurement according to claim 1, characterized in that: The micrometer head also includes: a positioning screw, a first threaded hole is provided on the vernier seat, a second threaded hole is provided on the guide sleeve, and the positioning screw is threadedly connected with the first threaded hole and the second threaded hole to fix the vernier seat and the guide sleeve.

4. A micrometer head for fine measurement according to claim 1, characterized in that: The micrometer head further comprises: a guide screw, an axial guide groove is provided on the side surface of the measuring rod, the guide sleeve is provided with a third threaded hole, the guide screw is threadedly connected with the third threaded hole and inserted into the guide groove.

5. A micrometer head for fine measurement according to claim 1, characterized in that: The micrometer head further comprises: a guide pin, an axial guide groove is arranged on the side surface of the measuring rod, the guide sleeve is provided with a third through hole, and the guide pin passes through the third through hole and is inserted into the guide groove.

6. A micrometer head for fine measurement according to claim 1, characterized in that: The micrometer head further includes: a first fixing screw, the rotating cylinder is provided with a transition hole, the front end of the micrometer screw is provided with a fourth threaded hole, and the fixing screw passes through the transition hole and is threadedly connected with the fourth threaded hole.

7. A micrometer head for fine measurement according to claim 1, characterized in that: The micrometer head also includes: a second fixing screw, a fifth threaded hole is provided on the micrometer nut, a sixth threaded hole is provided on the guide sleeve, and the second fixing screw is threadedly connected with the fifth threaded hole and the sixth threaded hole.

8. The micrometer head for fine measurement according to claim 1, characterized in that: The measuring rod is provided with a pressure plate, and the pressure plate abuts against the rear end of the pressure spring.

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