Differential micrometer head

Abstract

The utility model discloses a differential micrometer head which is characterized in that a shaft sleeve is sleeved in one end of a fixed sleeve, a measuring rod is sleeved in the front end of the shaft sleeve, a microdrum is sleeved outside the other end of the fixed sleeve, a micrometric screw rod is arranged in the fixed sleeve and the microdrum, one end of the micrometric screw rod is a large-diameter micrometric screw rod, and the other end of the micrometric screw rod is a small-diameter micrometric screw rod. The large-diameter micrometric screw end part of the micrometric screw is fixed in the microdrum end part; the large-diameter micrometric screw of the micrometric screw is in threaded connection with an adjusting nut A, and the adjusting nut A is fixedly connected to the shaft sleeve; the small-diameter micrometric screw of the micrometric screw is in threaded connection with an adjusting nut B. The adjusting nut B is fixedly connected to the measuring rod. According to the utility model, the structure is precise and reasonable, the two sets of screw pairs are coaxially and integrally arranged, the threads are arranged in the same direction, differential rotation, one-circle screwing of the microdrum and actual pushing of a differential distance value can be realized, and high-resolution measurement can be realized; moreover, the integrated arrangement greatly improves the coaxiality precision of the micrometric screw.

Description

Technical Field

[0001] The utility model relates to the technical field of precision measurement differential heads, in particular to a differential differential head. Background Art

[0002] The working principle of the differential micrometer is based on the principle of screw pair, which realizes precise displacement control of the object by converting rotational motion into linear motion.

[0003] At present, the setting structure of the differential micrometer head is cumbersome, the high-resolution measurement error is large, and the coaxiality requirements between the various components of the differential micrometer head are high. If the coaxiality of the adjustment screw, push rod, screw sleeve and other components is not good, it will cause additional friction and clearance during rotation or movement, affecting the measurement accuracy. In actual use, the coaxiality of the two micrometer screws is required to not exceed 0.003mm. Due to structural and process limitations, it is difficult for two sets of connected micrometer screws to meet the coaxiality requirements.

[0004] The existing publication number CN2809585Y is a micrometer differential transmission mechanism, which specifically discloses the use of two sets of connected helical pairs for differential transmission. One set of helical pairs consists of an external screw and an externally threaded sleeve, and the other set of helical pairs consists of an internal screw and an internally threaded sleeve. Due to the sleeve connection between the external screw and the internal screw, the process can only be fixed by connecting them, and its coaxiality is difficult to meet the requirements. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a differential micrometer head.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A differential differential head includes a differential cylinder, a fixed sleeve, a shaft sleeve, a measuring rod, a micrometer screw and an adjusting nut. The shaft sleeve is sleeved at one end of the fixed sleeve, the measuring rod is sleeved at the front end of the shaft sleeve, and the differential cylinder is arranged outside the other end of the fixed sleeve. A micrometer screw is arranged inside the fixed sleeve and the differential cylinder. One end of the micrometer screw is a large-diameter micrometer screw, and the other end of the micrometer screw is a small-diameter micrometer screw. The large-diameter micrometer screw end of the micrometer screw is fixed in the end of the differential cylinder; the large-diameter micrometer screw of the micrometer screw is threadedly connected to the adjusting nut A, and the adjusting nut A is fixedly connected to the shaft sleeve; the small-diameter micrometer screw of the micrometer screw is threadedly connected to the adjusting nut B, and the adjusting nut B is fixedly connected to the measuring rod.

[0008] The end of the measuring rod corresponding to the micrometer screw is provided with a movable cavity.

[0009] The fixed sleeve and the shaft sleeve are clamped together by a spring sheet. A guide cone and a stop screw are respectively provided on the upper and lower side walls of the shaft sleeve. A V-shaped groove is provided on the measuring rod corresponding to the guide cone for guiding the measuring rod.

[0010] A mounting nut is provided on the outer side of the front end of the sleeve for mounting the measuring rod.

[0011] The large-diameter micrometer screw end of the micrometer screw is fixed to the differential cylinder through a spring sleeve, a baffle and a nut. The spring sleeve is arranged in the end of the differential cylinder, the baffle is arranged at the end of the differential cylinder, and a through hole is provided on the baffle. The threaded end of the nut passes through the through hole of the baffle and is threadedly connected and fixed to the end of the micrometer screw.

[0012] The threads on the micrometer screw have the same rotation direction;

[0013] The large-diameter micrometer screw end of the micrometer screw and the adjusting nut A form a set of spiral pairs, and the small-diameter micrometer screw end of the micrometer screw and the adjusting nut B form a set of spiral pairs. The micrometer screw is driven by rotating the differential cylinder. When the micrometer screw is rotated forward, the adjusting nut B on the small-diameter micrometer screw of the micrometer screw drives the measuring rod to move backward, thereby generating a differential transmission.

[0014] The beneficial effects of the utility model are as follows: the structure is precise and reasonable, the two sets of spiral pairs are coaxially integrated, the threads are in the same direction, and the integrated micrometer screws of large and small diameters are combined with two adjusting nuts to realize differential rotation. When the differential cylinder is rotated one circle, the differential spacing value is actually advanced, and high-resolution measurement can be achieved; and the integrated setting greatly improves the coaxiality accuracy of the micrometer screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 It is a cross-sectional structural diagram of the utility model;

[0017] In the figure: 1. Differential cylinder; 2. Fixed sleeve; 3. Bushing; 4. Mounting nut; 5. Measuring rod; 6. Stop screw; 7. Nut; 8. Guide cone; 9. Micrometer screw; 10. Adjusting nut A; 11. Spring sleeve; 12. Adjusting nut B; 13. Spring sheet; 14. V-groove; 15. Baffle. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solution of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Example 1

[0020] In conjunction with the drawings and descriptions of the drawings, the utility model provides a differential differential head, which has the following structure: includes a differential cylinder 1, a fixed sleeve 2, a shaft sleeve 3, a measuring rod 5, a micrometer screw 9 and an adjusting nut, one end of the fixed sleeve 2 is sleeved with the shaft sleeve 3, the front end of the shaft sleeve 3 is sleeved with the measuring rod 5, the other end of the fixed sleeve 2 is outer-mounted with the differential cylinder 1, the fixed sleeve 2 and the differential cylinder 1 are provided with a micrometer screw 9, one end of the micrometer screw 9 is a large-diameter micrometer screw, the other end of the micrometer screw 9 is a small-diameter micrometer screw, and the large-diameter micrometer screw end of the micrometer screw 9 is fixed in the end of the differential cylinder 1; the large-diameter micrometer screw of the micrometer screw 9 is threadedly connected to the adjusting nut A10, and the adjusting nut A10 is fixedly connected to the shaft sleeve 3; the small-diameter micrometer screw of the micrometer screw 9 is threadedly connected to the adjusting nut B12, and the adjusting nut B12 is fixedly connected to the measuring rod 5;

[0021] The end of the measuring rod 5 corresponding to the micrometer screw 9 is provided with a movable cavity;

[0022] The fixed sleeve 2 and the shaft sleeve 3 are clamped together by a spring sheet 13. A guide cone 8 and a stop screw 6 are respectively provided on the upper and lower side walls of the shaft sleeve 3. A V-shaped groove 14 is provided on the measuring rod 5 corresponding to the guide cone 8 for guiding the measuring rod 5.

[0023] A mounting nut 4 is provided on the outer side of the front end of the sleeve 3;

[0024] The large-diameter end of the micrometer screw 9 is fixed to the differential cylinder 1 via a spring sleeve 11, a baffle 15, and a nut 7. The spring sleeve 11 is disposed within the end of the differential cylinder 1. The baffle 15 is disposed at the end of the differential cylinder 1. The baffle 15 is provided with a through hole. The threaded end of the nut 7 passes through the through hole of the baffle 15 and is threadedly connected to the end of the micrometer screw 9.

[0025] The threads on the micrometer screw 9 have the same direction of rotation, and are all right-hand threads;

[0026] The large-diameter micrometer screw end of the micrometer screw 9 and the adjusting nut A10 form a screw pair, and the small-diameter micrometer screw end of the micrometer screw 9 and the adjusting nut B12 form a screw pair. The micrometer screw 9 is driven by the rotation of the differential cylinder 1. When the micrometer screw 9 rotates forward, the adjusting nut B12 on the small-diameter micrometer screw of the micrometer screw 9 drives the measuring rod 5 to move backward, thereby forming a differential transmission;

[0027] Specifically, when the measuring range of the differential head is 1mm, the large-diameter micrometer screw end of the micrometer screw and the adjusting nut A form a spiral pair with a pitch of 0.5mm, and the small-diameter micrometer screw end of the micrometer screw and the adjusting nut B form a spiral pair with a pitch of 0.45mm; when the differential cylinder is rotated one circle, the micrometer screw advances 0.5mm, and the adjusting nut B on the micrometer screw drives the measuring rod to retreat 0.45mm, so the measuring rod actually moves forward 0.05mm when the differential cylinder is rotated one circle; the differential cylinder is set to 50 scale lines, so each grid on the differential cylinder 1 represents a scale of 0.05 / 50=0.001mm, achieving high-resolution measurement.

Claims

1. A differential micrometer head, characterized by: It includes a differential cylinder, a fixed sleeve, a shaft sleeve, a measuring rod, a micrometer screw and an adjusting nut. The shaft sleeve is sleeved at one end of the fixed sleeve, the measuring rod is sleeved at the front end of the shaft sleeve, and the differential cylinder is arranged outside the other end of the fixed sleeve. A micrometer screw is arranged in the fixed sleeve and the differential cylinder. One end of the micrometer screw is a large-diameter micrometer screw, and the other end of the micrometer screw is a small-diameter micrometer screw. The large-diameter micrometer screw end of the micrometer screw is fixed in the end of the differential cylinder; the large-diameter micrometer screw of the micrometer screw is threadedly connected to the adjusting nut A, and the adjusting nut A is fixedly connected to the shaft sleeve; the small-diameter micrometer screw of the micrometer screw is threadedly connected to the adjusting nut B, and the adjusting nut B is fixedly connected to the measuring rod.

2. The differential micrometer head according to claim 1, characterized in that: The end of the measuring rod corresponding to the micrometer screw is provided with a movable cavity.

3. The differential micrometer head according to claim 2, characterized in that: The fixed sleeve is clamped with the shaft sleeve via a spring sheet. A guide cone and a stop screw are respectively provided on the upper and lower side walls of the shaft sleeve. A V-shaped groove is provided on the measuring rod corresponding to the guide cone.

4. The differential micrometer head according to claim 3, characterized in that: A mounting nut is arranged on the outer side of the front end of the shaft sleeve.

5. The differential micrometer head according to claim 4, characterized in that: The large-diameter micrometer screw end of the micrometer screw is fixed to the differential cylinder through a spring sleeve, a baffle and a nut. The spring sleeve is arranged in the end of the differential cylinder, the baffle is arranged at the end of the differential cylinder, and a through hole is provided on the baffle. The threaded end of the nut passes through the through hole of the baffle and is threadedly connected and fixed to the end of the micrometer screw.

6. The differential micrometer head according to claim 5, characterized in that: The threads on the micrometer screw have the same rotation direction.

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