Linear fine adjustment device for digital display micrometer head

Abstract

The invention provides a linear fine adjustment device for a digital display micrometer head, which comprises a digital display micrometer head assembly and a fine adjustment assembly, and is characterized in that a connecting assembly and a transmission assembly are arranged, and the connecting assembly is used for controlling the connection between the fine adjustment assembly and the transmission assembly, so that the fine adjustment assembly and the transmission assembly can be switched between synchronous movement and separated movement; the transmission assembly can enable the fine adjustment assembly and the connecting assembly to rotate synchronously, the moving distance of a fixing block of the fine adjustment assembly is displayed through the digital display micrometer head assembly, the adjustment distance can be clearly controlled when the measurement range is adjusted through the arrangement, it is ensured that the adjustment distance is accurate, and the accuracy and authenticity of measurement data are improved.

Description

Technical Field

[0001] The invention relates to the field related to digital micrometer heads, in particular to a linear fine-tuning device for digital micrometer heads. Background Art

[0002] A digital micrometer is a precision measuring instrument that is usually used to measure and control small displacements or angle changes. This device combines a differential mechanism with digital display technology to provide high-precision readings.

[0003] During the use of the digital micrometer head, the range of values ​​that can be read is limited. When measuring large objects, it is impossible to measure them and they need to be adjusted. For example, publication number CN202485576U discloses "An Adjustable Micrometer", which includes a scale frame, a scale anvil, a micrometer, a force measuring device, a locking device, an adjustable device and a digital display device dedicated to the digital adjustable micrometer; an adjustment plate is hidden in the scale body of the scale frame, and the adjustment and positioning of the adjustment plate are controlled by the gap matched with the scale frame. The connection between the scale frame and the adjustment plate is fixed by the adjustment plate fastening screw through the adjustment plate positioning hole and the scale frame adjustment plate fixing screw hole and the rear insulation plate fixing screw hole. By adjusting the adjustment plate inside the micrometer, the original measurement range of the micrometer is expanded by at least one measurement specification, thereby reducing the use cost and expanding the measurement range while meeting the original measurement function.

[0004] Although the above-mentioned adjustable device has certain advantages in adjusting the measuring distance, it still has certain disadvantages: when the above-mentioned adjustable device adjusts the measuring range of the micrometer head, it is adjusted by adding a fixed plate, but this method limits the adjusted value and cannot be adjusted freely. Because it is adjusted by a linear fine-tuning device, when the fine-tuning device is used directly for adjustment, the adjusted distance cannot be accurately controlled, resulting in inaccurate measurement data. Summary of the invention

[0005] In order to solve the above technical problems, the object of the present invention is to provide a linear fine-tuning device for a digital micrometer head.

[0006] Based on this, the present invention proposes a linear fine-tuning device for a digital micrometer head, comprising a digital micrometer head assembly, a fine-tuning assembly, a connecting assembly and a transmission assembly, wherein the fine-tuning assembly is arranged at the rear end of the digital micrometer head assembly, the connecting assembly is arranged inside the fine-tuning assembly and extends rightward to the right end of the fine-tuning assembly, the transmission assembly is arranged on the outside of the digital micrometer head assembly, the transmission assembly is used for the transmission connection between the digital micrometer head assembly and the connecting assembly, the moving distance of the fixed block of the fine-tuning assembly is displayed through the digital micrometer head assembly, and the connecting assembly is used to control the connection and disconnection of the fine-tuning assembly and the transmission assembly.

[0007] Optionally, the digital micrometer head assembly includes a shell, a fixed sleeve, a movable sleeve, a fixed sleeve, an adjusting nut, a micrometer rod, a screw, a rotating handle 1, a gear 1, a rotation sensor and a controller. The fixed sleeve is fixed to the right end of the shell, the movable sleeve is arranged on the outside of the fixed sleeve, the fixed sleeve is fixed to the inner wall of the fixed sleeve and extends to the right to the inside of the movable sleeve, the adjusting nut is arranged at the right end of the outer side of the fixed sleeve, and the adjusting nut is fixed to the inner wall of the movable sleeve, the micrometer rod is arranged in the inside of the fixed sleeve and extends to the left end of the shell, the screw is arranged at the right end of the micrometer rod and extends to the right end of the movable sleeve, the rotating handle 1 is fixed to the right end of the screw, the gear 1 is fixed to the outside of the screw, the rotation sensor is installed at the right end of the inside of the movable sleeve, and the controller is installed inside the shell.

[0008] Optionally, the fine-tuning assembly includes a lower base, an upper base, a fixed block, a support plate 1, a worm, a turning handle 2, a rotating rod, a worm wheel, a gear 2 and a rack, the lower base is arranged at the rear end of the shell, the upper base is arranged at the top end of the lower base, the fixed block is fixed to the top end of the upper base, the support plate 1 is fixed to the inner rear end of the lower base, the worm is arranged at the left end of the support plate 1 and extends to the left end of the lower base, the turning handle 2 is fixed to the left end of the worm, the rotating rod is arranged at the inner front end and the inner rear end of the lower base, the worm wheel is fixed to the outer side of the rotating rod and meshes with the worm, the gear 2 is fixed to the outer side of the rotating rod, and the rack is fixed to the inner top end of the upper base and meshes with the gear 2.

[0009] Optionally, the connecting assembly includes a first bevel gear, a second bevel gear, a round rod 1, a support seat 1, a support plate 2, a round rod 2, a support seat 2 and a linkage mechanism, the first bevel gear is fixed to the outer side of the rotating rod, the second bevel gear is fixed to the left end of the round rod 1 and meshes with the first bevel gear, the round rod 2 is arranged inside the lower base and extends to the right end of the lower base, the support seat 1 is arranged on the outer side of the round rod 2, and the bottom end of the support seat 1 is fixed to the inner bottom end of the lower base, the support plate 2 is fixed to the right end of the lower base, the round rod 2 is arranged at the top end of the support plate 2, the support seat 2 is arranged on the outer side of the round rod 2, and the bottom end of the support seat 2 is fixed to the top end of the support plate 2, and the linkage mechanism is arranged on the outer sides of the round rods 1 and 2.

[0010] Optionally, the transmission assembly includes a protective shell, a pulley group, a bearing sleeve, and a fixed plate. The protective shell is arranged on the outside of the second round rod and the movable sleeve, the pulley group is arranged on the outside of the second round rod and the movable sleeve, and the pulley group is arranged inside the protective shell. The bearing sleeves are provided in four groups and are arranged on the left and right ends of the pulley groups in pairs. There are four types of fixed plates, which are respectively fixed to the outsides of the four groups of bearing sleeves, and the outside of the fixed plate is fixed to the inside of the protective shell.

[0011] Optionally, the linkage mechanism includes a support frame, gear three, a movable block, a movable groove, a fixed rod, gear four and an electric push rod, the support frame is arranged on the outside of round rod one and round rod two, and the bottom end of the support frame is fixed to the top end of support plate two, the gear three is provided with two groups, and is respectively fixed to the right end of round rod one and the left end of round rod two, the movable block is provided at the inner bottom end of the support frame, and the left and right ends of the movable block are provided inside the movable groove, the top end of the movable block is transmission connected with the electric push rod, the movable groove is provided with two groups, and is respectively opened at the inner left end and inner right end of the support frame, the fixed rod is fixed to the inner left end and inner right end of the movable block, the gear four is provided on the outside of the fixed rod, and the electric push rod is installed on the top end of the support frame.

[0012] Optionally, a groove is provided on the right end face of the micrometer rod, and the interior of the groove is threaded and threadedly connected to the screw rod. Through this arrangement, the micrometer rod can move when the screw rod rotates.

[0013] Optionally, the front end and the rear end of the micrometer rod are both provided with protrusions, and the protrusions extend to the inner wall of the fixed sleeve. This arrangement limits the movement trajectory of the micrometer rod to prevent it from rotating.

[0014] Optionally, the inner walls of the support seat 1 and the support seat 2 are both smoothly arranged, and this arrangement facilitates the rotation of the round rod 1 and the round rod 2.

[0015] Optionally, both gear three and gear four are high-precision gears, and gear three and gear four are meshed with each other. Through this arrangement, when gear three rotates, the two groups of gears three can rotate synchronously through the cooperation of gear four.

[0016] Optionally, the inner wall of the movable groove fits with the outer side of the movable block, and the moving trajectory of the movable block is restricted by this arrangement.

[0017] Optionally, the movable block is arranged in an inverted "U" shape, through which the movable block will not affect the rotation of gear four.

[0018] The present invention has the following advantages: The present invention provides a linear fine-tuning device for a digital display micrometer head through improvement, which has the following improvements compared with the same type of equipment:

[0019] The present invention provides a linear fine-tuning device for a digital micrometer head. By setting a connecting component, an electric push rod is used to push a movable block to move during adjustment. The movement of the movable block drives gear four to move, so that gear four is meshed with gear three. When round rod one rotates, the cooperation of gear three and gear four can drive round rod two to rotate synchronously. Through this setting, the connection between the fine-tuning component and the digital micrometer head component can be quickly controlled, so that it can be quickly converted between synchronous activity and separate activity for easy use.

[0020] The present invention provides a linear fine-tuning device for a digital micrometer head. By setting a transmission component, when the round rod rotates, the movable sleeve can be moved synchronously through the cooperation of the transmission component, so that the distance value adjusted by the fine-tuning component can be observed through the digital micrometer component, thereby achieving precise control, ensuring the accuracy of the adjusted distance, and improving the accuracy and authenticity of the measurement data. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 It is a top view of the structure of the present invention;

[0023] Figure 3 A top view of the structure of the digital micrometer head assembly of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the fine-tuning component of the present invention;

[0025] Figure 5 It is a side view of the fine-tuning component structure of the present invention;

[0026] Figure 6 A top view of the connecting assembly structure of the present invention;

[0027] Figure 7 It is a front view of the linkage mechanism structure of the present invention;

[0028] Figure 8 It is a top view of the transmission assembly structure of the present invention.

[0029] Description of reference numerals: digital display micrometer head assembly-1, fine adjustment assembly-2, connecting assembly-3, transmission assembly-4, housing-11, fixed sleeve-12, movable sleeve-13, fixed sleeve-14, adjusting nut-15, micrometer rod-16, screw-17, handle-18, gear-19, rotation sensor-110, controller-111, lower base-21, upper base-22, fixed block-23, support plate-1-24, worm-25, handle-26, rotating rod-27, Worm gear-28, gear two-29, rack-210, first bevel gear-31, second bevel gear-32, round rod one-33, support seat one-34, support plate two-35, round rod two-36, support seat two-37, linkage mechanism-38, protective shell-41, pulley group-42, bearing sleeve-43, fixed plate-44, support frame-381, gear three-382, movable block-383, movable groove-384, fixed rod-385, gear four-386, electric push rod-387. DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0033] For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] Please refer to Figure 1-5The present embodiment provides a linear fine-tuning device for a digital micrometer head, comprising a digital micrometer head assembly 1, a fine-tuning assembly 2, a connecting assembly 3 and a transmission assembly 4. The fine-tuning assembly 2 is arranged at the rear end of the digital micrometer head assembly 1, the connecting assembly 3 is arranged inside the fine-tuning assembly 2 and extends rightward to the right end of the fine-tuning assembly 2, and the transmission assembly 4 is arranged outside the digital micrometer head assembly 1. The transmission assembly 4 is used for transmission connection between the digital micrometer head assembly 1 and the connecting assembly 3. The moving distance of the fixed block 23 of the fine-tuning assembly 2 is displayed by the digital micrometer head assembly 1. The connecting assembly 3 is used to control the connection and disconnection of the fine-tuning assembly 2 and the transmission assembly 4. The digital micrometer head assembly 1 comprises a housing 11, a fixed sleeve 12, an active The movable sleeve 13, the fixed sleeve 14, the adjusting nut 15, the micrometer rod 16, the screw 17, the rotating handle 18, the gear 19, the rotation sensor 110 and the controller 111, the fixed sleeve 12 is fixed to the right end of the housing 11, the movable sleeve 13 is arranged on the outside of the fixed sleeve 12, the fixed sleeve 14 is fixed to the inner wall of the fixed sleeve 12, and extends to the right inside the movable sleeve 13, the adjusting nut 15 is arranged on the right end of the outer side of the fixed sleeve 14, and the adjusting nut 15 is fixed to the inner wall of the movable sleeve 13, the micrometer rod 16 is arranged in the interior of the fixed sleeve 14, and extends to the left to the left end of the housing 11, the screw 17 is arranged on the right end of the micrometer rod 16, and extends to the right to the right end of the movable sleeve 13, the rotating handle 18 is fixed to the inner wall of the fixed sleeve 12, and the micrometer rod 16 is arranged in the inner wall ... The gear 19 is fixed to the right end of the screw 17, the gear 19 is fixed to the outside of the screw 17, the rotation sensor 110 is installed at the right end of the inside of the movable sleeve 13, and the controller 111 is installed inside the shell 11. The fine-tuning component 2 includes a lower base 21, an upper base 22, a fixed block 23, a support plate 1 24, a worm 25, a turning handle 26, a rotating rod 27, a worm wheel 28, a gear 29 and a rack 210. The lower base 21 is arranged at the rear end of the shell 11, the upper base 22 is arranged at the top of the lower base 21, the fixed block 23 is fixed to the top of the upper base 22, the support plate 1 24 is fixed to the inner rear end of the lower base 21, the worm 25 is arranged at the left end of the support plate 1 24, and extends to the left to the left end of the lower base 21, the turning handle 2 26 is fixed to the left end of the worm 25, the rotating rod 27 is arranged at the internal front end and the internal rear end of the lower base 21, the worm wheel 28 is fixed to the outer side of the rotating rod 27 and meshes with the worm 25, the gear 29 is fixed to the outer side of the rotating rod 27, the rack 210 is fixed to the internal top end of the upper base 22, and meshes with the gear 29, the right end face of the micrometer rod 16 is provided with a groove, and the inside of the groove is threaded and is threadedly connected with the screw 17. Through this arrangement, the micrometer rod 16 can be moved when the screw 17 is rotated, and the front and rear ends of the micrometer rod 16 are provided with protrusions, and the protrusions extend to the inner wall of the fixed sleeve 14. Through this arrangement, the movement trajectory of the micrometer rod 16 is limited to prevent it from rotating.

[0036] Please refer to Figure 6-8The present embodiment provides a linear fine-tuning device for a digital micrometer head. The connecting assembly 3 includes a first bevel gear 31, a second bevel gear 32, a round rod 1 33, a support seat 1 34, a support plate 2 35, a round rod 2 36, a support seat 2 37 and a linkage mechanism 38. The first bevel gear 31 is fixed to the outside of the rotating rod 27, the second bevel gear 32 is fixed to the left end of the round rod 1 33, and is meshed with the first bevel gear 31. The round rod 2 36 is arranged inside the lower base 21 and extends rightward to the right end of the lower base 21. The support seat 1 34 is arranged on the outside of the round rod 2 36, and the bottom end of the support seat 1 34 is fixed to the inner bottom end of the lower base 21. The support plate 2 35 is fixed to the right end of the lower base 21. The round rod 2 36 is arranged at the top of the support plate 2 35. The support seat 2 37 is arranged on the outside of the round rod 2 36, and the bottom end of the support seat 2 37 is fixed to the top of the support plate 2 35. The linkage mechanism 38 is arranged on the outside of the round rod 1 33 and the round rod 2 36. The transmission component 4 includes a protective shell 41, a pulley group 42, a bearing sleeve 43, and a fixed plate 44. The protective shell 41 is arranged on the outside of the round rod 2 36 and the movable sleeve 13, the pulley group 42 is arranged on the outside of the round rod 2 36 and the movable sleeve 13, and the pulley group 42 is arranged inside the protective shell 41. There are four groups of bearing sleeves 43, and two are arranged on one side at the left and right ends of the pulley group 42. There are four types of fixed plates 44, and they are respectively fixed on the outside of the four groups of bearing sleeves 43. The outside of the fixed plate 44 is fixed to the inside of the protective shell 41. The linkage mechanism 38 includes a support frame 381, a gear three 382, ​​a movable block 383, a movable groove 384, a fixed rod 385, a gear four 386 and an electric push rod 387. The support frame 381 is arranged on the outside of the round rod one 33 and the round rod two 36, and the bottom end of the support frame 381 is fixed to the top of the support plate two 35. The gear three 382 has two groups and is respectively fixed to the right end of the round rod one 33 and the left end of the round rod two 36. The movable block 383 is arranged at the inner bottom end of the support frame 381, and the left and right ends of the movable block 383 are arranged inside the movable groove 384. The top of the movable block 383 is transmission-connected with the electric push rod 387. The movable groove 384 has two groups and is respectively opened at the inner left end and the inner right end of the support frame 381. The fixed rod 385 is fixed to The inner left end and the inner right end of the movable block 383, the gear four 386 are arranged on the outer side of the fixed rod 385, the electric push rod 387 is installed on the top of the support frame 381, the inner walls of the support seat 1 34 and the support seat 2 37 are both smoothly set, through this setting, the round rod 1 33 and the round rod 2 36 can be easily rotated, the gear three 382 and the gear four 386 are both high-precision gears, and the gear three 382 and the gear four 386 are meshed with each other, through this setting, when the gear three 382 rotates, the two groups of gears three 382 can be rotated synchronously through the cooperation of the gear four 386, the inner wall of the movable groove 384 is in contact with the outer side of the movable block 383, and the moving trajectory of the movable block 383 is limited by this setting, and the movable block 383 is set in an inverted "U" shape.This arrangement ensures that the movable block 383 will not affect the rotation of the gear four 386.

[0037] The present invention provides a linear fine-tuning device for a digital display micrometer head through improvement, and its working principle is as follows;

[0038] First, before use, bring the object to be measured to the digital micrometer head assembly 1 and wait for measurement;

[0039] Second, when in use, place the object to be measured close to the right end of the fixed block 23, then rotate the handle 18, so that the handle 18 drives the screw 17 to rotate, and the screw 17 drives the micrometer rod 16 to move, so that the micrometer rod 16 is close to the object to be measured, and the screw 17 drives the gear 19 to rotate during the rotation process, and the gear 19 cooperates with the rotation sensor 110 to detect the rotation of the screw 17 when rotating, and then the number of rotations is converted into an electrical signal through the controller 111 and displayed on the display screen, and the measurement is completed, and then the handle 18 is reversely rotated to remove the object to be measured;

[0040] Third, when measuring objects of different sizes, the position of the fixed block 23 needs to be adjusted, and the electric push rod 387 is started to push the movable block 383 to move. When the movable block 383 moves, the fixed rod 385 drives the gear 4 386 to move, and the gear 4 386 moves downward to mesh with the two sets of gear 3 382;

[0041] Fourth, the second handle 26 is rotated, so that the second handle 26 drives the worm 25 to rotate, and the worm 25 drives the worm wheel 28 to rotate when it rotates, and the worm wheel 28 drives the rotating rod 27 to rotate when it rotates, and the rotating rod 27 drives the second gear 29 to rotate when it rotates, and the second gear 29 drives the rack 210 to move when it rotates, and the upper base 22 drives the upper base 22 to move when it moves;

[0042] Fifth, the rotating rod 27 drives the first bevel gear 31 to rotate during the rotation process, and the first bevel gear 31 drives the second bevel gear 32 to rotate when rotating, and the second bevel gear 32 drives the gear three 382 to rotate when rotating, and the gear three 382 drives the two sets of gear three 382 to rotate synchronously through the cooperation of the gear four 386, thereby driving the round rod two 36 to rotate;

[0043] Sixth, when the round rod 2 36 rotates, the electric push rod 387 drives the movable sleeve 13 to rotate, and when the movable sleeve 13 rotates, it drives the screw 17 to rotate. During the rotation process, the screw 17 drives the gear 19 to rotate. When the gear 19 rotates, it cooperates with the rotation sensor 110 to detect the rotation of the screw 17, and then the number of rotations is converted into an electrical signal by the controller 111 and displayed on the display screen. The distance moved by the fixed block 23 can be judged by observing the display screen, and the adjustment distance can be accurately controlled;

[0044] Seventh, when reaching the designated position, release the second handle 26, control the electric push rod 387 to drive the movable block 383 to move upward, and when the movable block 383 moves, it drives the fourth gear 386 to move, canceling the meshing effect with the third gear 382, ​​and then the digital display micrometer head assembly 1 can be used again to continue measuring.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A linear fine-tuning device for a digital micrometer head, characterized in that: The invention comprises a digital micrometer head assembly (1), a fine adjustment assembly (2), a connecting assembly (3) and a transmission assembly (4), wherein the fine adjustment assembly (2) is arranged at the rear end of the digital micrometer head assembly (1), the connecting assembly (3) is arranged inside the fine adjustment assembly (2) and extends rightward to the right end of the fine adjustment assembly (2), and the transmission assembly (4) is arranged outside the digital micrometer head assembly (1); The transmission component (4) is used for transmission connection between the digital micrometer head component (1) and the connection component (3), and the moving distance of the fixed block (23) of the fine adjustment component (2) is displayed through the digital micrometer head component (1). The connection component (3) is used to control the connection and disconnection of the fine adjustment component (2) and the transmission component (4).

2. A linear fine-tuning device for a digital micrometer head according to claim 1, characterized in that: The digital display micrometer head assembly (1) comprises a housing (11), a fixed sleeve (12), a movable sleeve (13), a fixed sleeve (14), an adjusting nut (15), a micrometer rod (16), a screw (17), a rotating handle (18), a gear (19), a rotation sensor (110) and a controller (111). The fixed sleeve (12) is fixed to the right end of the housing (11), the movable sleeve (13) is arranged on the outside of the fixed sleeve (12), the fixed sleeve (14) is fixed to the inner wall of the fixed sleeve (12) and extends rightward to the inside of the movable sleeve (13), and the adjusting nut (15) is arranged on the fixed sleeve (12). The outer right end of the fixed sleeve (14), and the adjusting nut (15) is fixed to the inner wall of the movable sleeve (13), the micrometer rod (16) is arranged inside the fixed sleeve (14) and extends to the left to the left end of the housing (11), the screw rod (17) is arranged at the right end of the micrometer rod (16) and extends to the right to the right end of the movable sleeve (13), the turning handle (18) is fixed to the right end of the screw rod (17), the gear (19) is fixed to the outer side of the screw rod (17), the rotation sensor (110) is installed at the inner right end of the movable sleeve (13), and the controller (111) is installed inside the housing (11).

3. A linear fine-tuning device for a digital micrometer head according to claim 1, characterized in that: The fine adjustment assembly (2) comprises a lower base (21), an upper base (22), a fixing block (23), a support plate (24), a worm (25), a second turning handle (26), a rotating rod (27), a worm wheel (28), a second gear (29) and a rack (210), wherein the lower base (21) is arranged at the rear end of the housing (11), the upper base (22) is arranged at the top end of the lower base (21), the fixing block (23) is fixed to the top end of the upper base (22), the support plate (24) is fixed to the inner rear end of the lower base (21), and the The worm (25) is arranged at the left end of the first support plate (24) and extends leftward to the left end of the lower base (21); the second turning handle (26) is fixed to the left end of the worm (25); the rotating rod (27) is arranged at the inner front end and the inner rear end of the lower base (21); the worm wheel (28) is fixed to the outer side of the rotating rod (27) and meshes with the worm (25); the second gear (29) is fixed to the outer side of the rotating rod (27); and the rack (210) is fixed to the inner top end of the upper base (22) and meshes with the second gear (29).

4. A linear fine-tuning device for a digital micrometer head according to claim 1, characterized in that: The connecting assembly (3) comprises a first bevel gear (31), a second bevel gear (32), a round rod (33), a support seat (34), a second support plate (35), a second round rod (36), a second support seat (37) and a linkage mechanism (38); the first bevel gear (31) is fixed to the outside of the rotating rod (27); the second bevel gear (32) is fixed to the left end of the round rod (33) and meshes with the first bevel gear (31); the second round rod (36) is arranged inside the lower base (21) and extends rightward to the lower base (21); The right end of the lower base (21), the support seat 1 (34) is arranged on the outer side of the round rod 2 (36), and the bottom end of the support seat 1 (34) is fixed to the inner bottom end of the lower base (21), the support plate 2 (35) is fixed to the right end of the lower base (21), the round rod 2 (36) is arranged on the top end of the support plate 2 (35), the support seat 2 (37) is arranged on the outer side of the round rod 2 (36), and the bottom end of the support seat 2 (37) is fixed to the top end of the support plate 2 (35), and the linkage mechanism (38) is arranged on the outer side of the round rod 1 (33) and the round rod 2 (36).

5. The linear fine-tuning device for a digital micrometer head according to claim 1, characterized in that: The transmission assembly (4) comprises a protective shell (41), a pulley group (42), a bearing sleeve (43), and a fixed plate (44); the protective shell (41) is arranged on the outside of the second round rod (36) and the movable sleeve (13); the pulley group (42) is arranged on the outside of the second round rod (36) and the movable sleeve (13); and the pulley group (42) is arranged inside the protective shell (41); four groups of bearing sleeves (43) are provided, and two are arranged on a side at the left and right ends of the pulley group (42); four types of fixed plates (44) are provided, and are respectively fixed to the outsides of the four groups of bearing sleeves (43); and the outside of the fixed plate (44) is fixed to the inside of the protective shell (41).

6. A linear fine-tuning device for a digital micrometer head according to claim 4, characterized in that: The linkage mechanism (38) comprises a support frame (381), a gear three (382), a movable block (383), a movable groove (384), a fixed rod (385), a gear four (386) and an electric push rod (387). The support frame (381) is arranged on the outside of the round rod one (33) and the round rod two (36), and the bottom end of the support frame (381) is fixed to the top end of the support plate two (35). The gear three (382) is provided with two groups and is respectively fixed to the right end of the round rod one (33) and the left end of the round rod two (36). The movable block (383) is arranged on the support frame (381). The inner bottom end of the support frame (381), and the left and right ends of the movable block (383) are arranged inside the movable groove (384), the top end of the movable block (383) is transmission-connected with the electric push rod (387), the movable groove (384) is provided with two groups, and is respectively opened at the inner left end and the inner right end of the support frame (381), the fixed rod (385) is fixed to the inner left end and the inner right end of the movable block (383), the gear four (386) is arranged on the outer side of the fixed rod (385), and the electric push rod (387) is installed on the top end of the support frame (381).

7. A linear fine-tuning device for a digital micrometer head according to claim 4, characterized in that: The inner walls of the support seat 1 (34) and the support seat 2 (37) are both smooth.

8. The linear fine adjustment device for a digital micrometer head according to claim 6, characterized in that: The gear three (382) and the gear four (386) are both high-precision gears, and the gear three (382) and the gear four (386) are meshed with each other.

9. A linear fine-tuning device for a digital micrometer head according to claim 6, characterized in that: The inner wall of the movable groove (384) is in contact with the outer side of the movable block (383).

10. The linear fine-tuning device for a digital micrometer head according to claim 6, characterized in that: The movable block (383) is arranged in an inverted "U" shape.

Images