Mechanical dial vernier caliper

Abstract

This utility model discloses a mechanical rotary scale vernier caliper, relating to the field of vernier caliper technology. It includes a main scale body and a vernier scale. The main scale body is slidably connected to a sliding groove on the vernier scale, and a rack body is provided on the main scale body. A mechanical rotary module is fixed on the vernier scale. The mechanical rotary module includes a transparent scale, a pointer body, a shielding plate, an inner scale, an outer scale, a pointer drive gear set, an inner drive gear set, and an outer drive gear set. The pointer body is disposed between the transparent scale and the shielding plate. The inner and outer scales are located on one side of the shielding plate. The pointer drive gear set is drivingly connected to the rack body, the pointer body, the inner drive gear set, and the outer drive gear set. This utility model allows measurement data to be directly viewed on the mechanical rotary module, making readings more convenient.

Description

Technical Field

[0001] This utility model relates to the field of vernier caliper technology, and in particular to a mechanical rotary vernier caliper. Background Technology

[0002] A vernier caliper is a measuring instrument used to measure length, inner and outer diameters, and depth. A vernier caliper consists of a main scale and a sliding vernier scale attached to the main scale. The main scale is generally measured in millimeters, while the vernier scale has 10, 20, or 50 divisions. Depending on the number of divisions, vernier calipers can be classified as 10-division, 20-division, or 50-division vernier calipers, etc. A 10-division vernier caliper measures 9mm, a 20-division vernier caliper measures 19mm, and a 50-division vernier caliper measures 49mm. The main scale and vernier scale of a vernier caliper have two sets of movable jaws: an inner jaw and an outer jaw. The inner jaw is typically used to measure the inner diameter, while the outer jaw is typically used to measure the length and outer diameter.

[0003] Existing vernier calipers include those with digital displays and those with dials. However, with existing vernier calipers that have dials, in practical use, one needs to first read the measurement value on the main scale, then read the measurement value on the vernier scale, and finally combine the two values ​​to obtain the accurate measurement. This method of measurement calculation requires observing the data on both the main scale and the dial, making the observation of the measurement result inconvenient.

[0004] Therefore, there is an urgent need in this field for a new type of mechanical rotary vernier caliper to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a mechanical rotary vernier caliper to solve the problems existing in the prior art and make reading more convenient.

[0006] To achieve the above objectives, this utility model provides the following solution: This utility model discloses a mechanical rotary scale vernier caliper, including a main scale body and a vernier scale. The vernier scale is provided with a sliding groove, the main scale body is slidably connected to the sliding groove, and a rack body is provided on the main scale body. A mechanical turntable module is fixed on the vernier scale. The mechanical turntable module includes a transparent dial, a pointer body, a shielding plate, an inner dial, an outer dial, a pointer drive gear set, an inner drive gear set, and an outer drive gear set. The transparent dial has graduations. The pointer body is positioned between the transparent dial and the shielding plate. The inner dial is located inside the outer dial. The inner and outer dials are located on the side of the shielding plate away from the pointer body. The shielding plate has a reading window. The pointer drive gear set is driven by the rack body, the pointer body, the inner dial, the inner dial, the outer dial, and the outer dial.

[0007] Preferably, the pointer drive gear set includes a pointer drive first gear structure, the lower end of which meshes with the rack body, a pointer drive second gear structure fixed to the upper end of the pointer drive first gear structure, and a pointer drive third gear structure meshing with the pointer drive second gear structure, the upper end of which is fixedly connected to one end of the pointer body.

[0008] Preferably, the inner ring drive gear set includes an inner ring drive first gear structure, which meshes with the pointer drive second gear structure. The inner ring drive first gear structure is meshed with the inner ring drive second gear structure. The upper end of the inner ring drive second gear structure is fixedly connected to an inner ring drive third gear structure. The inner ring drive third gear structure is meshed with an inner ring drive fourth gear structure. The upper end of the inner ring drive fourth gear structure is fixedly connected to the center of the inner ring scale.

[0009] Preferably, the outer ring drive gear set includes an outer ring drive first gear structure, which meshes with the inner ring drive fourth gear structure. The outer ring drive first gear structure is also meshed with an outer ring drive second gear structure, and the upper end of the outer ring drive second gear structure is fixedly connected to the center of the outer ring scale.

[0010] Preferably, the upper end of the pointer-driven third gear structure can pass through the center of the inner ring-driven fourth gear structure and the center of the outer ring-driven second gear structure, and the upper end of the pointer-driven third gear structure is interference-fitted with the end through hole of the pointer body; The upper end of the inner ring drive fourth gear structure passes through the center of the outer ring drive second gear structure, and the upper end of the inner ring drive fourth gear structure is interference-fitted with the center through hole of the inner ring scale. The upper end of the outer ring drive second gear structure is interference-fitted with the center through hole of the outer ring scale.

[0011] Preferably, the mechanical turntable module includes a gear set bracket, and the pointer drive gear set, the inner ring drive gear set, and the outer ring drive gear set are all disposed on the gear set bracket; The gear set support includes an upper gear set support, a middle gear set support, and a lower gear set support, which are fixed together by bolts.

[0012] Preferably, the mechanical turntable module further includes an adjusting cover ring and a turntable housing. The transparent dial is fixed on the adjusting cover ring. The outer wall of the turntable housing is provided with an annular protrusion, and the inner wall of the adjusting cover ring is provided with an annular groove. The annular protrusion is rotatably connected to the annular groove. The side wall of the turntable housing is threaded with a cover ring positioning bolt, and the end of the cover ring positioning bolt can abut against the outer wall of the adjusting cover ring.

[0013] Preferably, the reading window is provided with an outer ring indicator arrow and an inner ring indicator arrow on both sides.

[0014] Preferably, one end of the rack body is provided with a rack limiting protrusion, the main scale body is provided with a rack limiting groove, and the rack limiting protrusion is threadedly connected to a rack adjusting bolt; The rack body is also threaded with a rack fixing bolt, and the main scale body is provided with a strip groove, the end of which can abut against the inner wall of the strip groove.

[0015] Preferably, the end of the rack adjusting bolt is provided with a bolt limiting part, the end of the main scale body is connected with an end cover plate, and the adjacent surfaces of the main scale body and the end cover plate are each provided with a bolt limiting groove, and the bolt limiting part is located in the bolt limiting groove.

[0016] The present invention achieves the following technical advantages over the prior art: In this invention, when the main scale body slides on the vernier scale, the rack body drives the pointer drive gear set, the inner ring drive gear set, and the outer ring drive gear set for transmission. The pointer drive gear set, the inner ring drive gear set, and the outer ring drive gear set are used to drive the pointer body, the inner ring scale, and the outer ring scale to rotate respectively, so that the user can directly read the measurement results from the mechanical turntable module, making the reading method simpler and more convenient. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the mechanical rotary scale vernier caliper of this utility model; Figure 2 This is an exploded view of the mechanical turntable module in the mechanical turntable vernier caliper of this utility model. Figure 3 This is a schematic diagram showing the separation of the inner and outer scales in the mechanical rotary vernier caliper of this utility model; Figure 4 This is a schematic diagram of the internal structure of the turntable shell in the mechanical turntable vernier caliper of this utility model; Figure 5 This is an exploded view of the internal structure of the turntable shell in the mechanical turntable vernier caliper of this utility model; Figure 6 This is a schematic diagram of the structure of the support and lower support of the gear set in the mechanical rotary vernier caliper of this utility model; Figure 7 This is a schematic diagram of the upper support and the middle support of the gear set in the mechanical rotary scale vernier caliper of this utility model; Figure 8 for Figure 7 Exploded view; Figure 9 This is a top exploded view of the main scale body and end cover plate of the mechanical rotary scale vernier caliper of this utility model; Figure 10 This is an exploded view from below of the main scale body and end cover plate of the mechanical rotary vernier caliper of this utility model. Figure 11 This is a structural diagram of the main scale body near the end cover plate in the mechanical rotary scale vernier caliper of this utility model; Figure 12 This diagram shows the connection relationship between the adjusting cover ring and the turntable shell in the mechanical turntable vernier caliper of this utility model. In the diagram: 1-Main scale body; 101-Rack limiting groove; 102-Strip groove; 2-Vernier scale; 3-Rack body; 301-Rack limiting protrusion; 4-Mechanical turntable module; 5-Transparent dial; 6-Pointer body; 7-Shielding disc; 701-Reading window; 8-Inner dial; 9-Outer dial; 10-Pointer drive gear set; 1001-Pointer drive first gear structure; 1002-Pointer drive second gear structure; 1003-Pointer drive third gear structure; 11-Inner ring drive gear set; 1101-Inner ring drive first gear structure; 1102-Inner ring drive second gear structure; 1103 - Inner ring drive third gear structure; 1104 - Inner ring drive fourth gear structure; 12 - Outer ring drive gear set; 1201 - Outer ring drive first gear structure; 1202 - Outer ring drive second gear structure; 13 - Gear set bracket; 1301 - Gear set upper bracket; 1302 - Gear set middle bracket; 1303 - Gear set lower bracket; 14 - Adjusting cover ring; 15 - Turntable housing; 16 - Cover ring positioning bolt; 17 - Rack adjusting bolt; 1701 - Bolt limiting part; 18 - Rack fixing bolt; 19 - End cover plate; 20 - Bolt limiting groove; 21 - Handwheel fixing seat; 22 - Sliding handwheel. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] The purpose of this invention is to provide a mechanical rotary vernier caliper to solve the problems existing in the prior art and make reading more convenient.

[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1-12As shown, this embodiment provides a mechanical rotary scale vernier caliper, including a main scale body 1 and a vernier scale 2. The vernier scale 2 is provided with a sliding groove, and the main scale body 1 is slidably connected to the sliding groove. The main scale body 1 is provided with linear graduations and a rack body 3. A main scale fixing bolt can also be threaded onto the side wall of the vernier scale 2. When the main scale fixing bolt is tightened, the end of the main scale fixing bolt can abut against the side wall of the main scale body 1, thereby fixing the relative position between the main scale body 1 and the vernier scale 2. A handwheel fixing seat 21 is bolted to the outer wall of the vernier scale 2. The handwheel fixing seat 21 has a handwheel fixing groove, and a sliding handwheel 22 is rotatably connected in the handwheel fixing groove. The sliding handwheel 22 includes a central cylinder and two end cylinders. The two end cylinders are respectively fixed to the two ends of the central cylinder, and the diameter of the end cylinders is larger than that of the central cylinder. The central cylinder is rotatably connected to the handwheel fixing groove, and the adjacent surfaces of the two end cylinders are in contact with the upper and lower surfaces of the main scale body 1. When the sliding handwheel 22 is rotated, the main scale body 1 can be driven to slide along the length of the sliding groove. In addition, both the main scale body 1 and the vernier scale 2 are provided with measuring claws. These are inherent structures on existing vernier calipers, so their specific structures will not be described in detail here.

[0023] A mechanical turntable module 4 is fixed on the vernier scale 2. The mechanical turntable module 4 includes a transparent dial 5, a pointer body 6, a shielding plate 7, an inner dial 8, an outer dial 9, a pointer drive gear set 10, an inner drive gear set 11, and an outer drive gear set 12. The transparent dial 5 has circular graduations. The pointer body 6 is rotatably positioned between the transparent dial 5 and the shielding plate 7. The inner dial 8 is located inside the outer dial 9. Both the inner dial 8 and the outer dial 9 have circular graduations. The inner dial 8 and the outer dial 9 are located on the side of the shielding plate 7 away from the pointer body 6. The shielding plate 7 has an arc-shaped reading window 701. The pointer drive gear set 10 is connected to the rack body 3 for transmission. When the mechanical turntable module 4 moves along the linear direction of the rack body 3, the pointer drive gear set 10 operates. The pointer drive gear set 10 is connected to the pointer body 6, and when the pointer drive gear set 10 is running, it drives the pointer body 6 to rotate. The pointer drive gear set 10 is also connected to the inner ring drive gear set 11, and when the pointer drive gear set 10 is running, it drives the inner ring drive gear set 11 to rotate. The inner ring drive gear set 11 is also connected to the inner ring dial 8, and when the inner ring drive gear set 11 is running, it drives the inner ring dial 8 to rotate. The inner ring drive gear set 11 is connected to the outer ring drive gear set 12, and when the inner ring drive gear set 11 is running, it drives the outer ring drive gear set 12 to rotate. The outer ring drive gear set 12 is connected to the outer ring dial 9, and when the outer ring drive gear set 12 is running, it drives the outer ring dial 9 to rotate.

[0024] In actual use, the user rotates the sliding handwheel 22 according to the object to be measured, thereby adjusting the relative position between the main scale body 1 and the vernier scale 2, so that the corresponding measuring claws on the main scale body 1 and the vernier scale 2 come into contact with the object to be measured. During this process, since the pointer drive gear set 10 is connected to the rack body 3, when the vernier scale 2 and the main scale body 1 are relatively displaced, the rack body 3 can drive the pointer drive gear set 10 to run. The pointer drive gear set 10 will further drive the inner ring drive gear set 11 and the outer ring drive gear set 12 to run. The pointer drive gear set 10, the inner ring drive gear set 11 and the outer ring drive gear set 12 are used to drive the pointer body 6, the inner ring dial 8 and the outer ring dial 9 to rotate respectively. Then the user can directly read the measurement result on the mechanical turntable module 4. The reading process is simple and convenient.

[0025] In this embodiment, from Figures 4-6 As can be seen, the pointer-driven gear set 10 includes two pointer-driven first gear structures 1001. The upper end of each pointer-driven first gear structure 1001 is a rectangular column, and the lower end is a gear. The lower gear of the pointer-driven first gear structure 1001 can mesh with the rack body 3. Each pointer-driven first gear structure 1001 has a pointer-driven second gear structure 1002 fixed at its upper end. The lower end of the pointer-driven second gear structure 1002 is provided with a socket structure that matches the shape of the upper end of the pointer-driven first gear structure 1001. The upper end of the pointer-driven first gear structure 1001 and the lower end of the pointer-driven second gear structure 1002 are interference-fitted to fix the two together. The pointer-driven second gear structure 1002 is provided with a large gear part and a small gear part. The diameter of the large gear part of the pointer-driven second gear structure 1002 is larger than the diameter of the small gear part. The large gear parts of the two pointer-driven second gear structures 1002 are also meshed and connected to a pointer-driven third gear structure 1003. The pointer-driven third gear structure 1003 is provided with a gear structure that meshes with the large gear part of the pointer-driven second gear structure 1002. The upper end of the pointer-driven third gear structure 1003 is fixedly connected to one end of the pointer body 6.

[0026] When the mechanical turntable module 4 moves along the length of the main scale body 1, the lower gear of the pointer drive first gear structure 1001 meshes with the rack body 3, thereby driving the pointer drive first gear structure 1001 to rotate. Then, the two pointer drive first gear structures 1001 can drive the two pointer drive second gear structures 1002 to rotate respectively. The two pointer drive second gear structures 1002 drive the pointer drive third gear structure 1003 located in the middle to rotate. Finally, the pointer drive third gear structure 1003 drives the pointer body 6 to rotate.

[0027] In this embodiment, as Figures 5-8 As shown, the inner ring drive gear set 11 includes an inner ring drive first gear structure 1101, which meshes with a pointer drive second gear structure 1002. Specifically, the inner ring drive first gear structure 1101 has a large gear portion and a small gear portion. The large gear portion of the inner ring drive first gear structure 1101 meshes with the small gear portion of the pointer drive second gear structure 1002. The small gear portion of the inner ring drive first gear structure 1101 is meshed with and connected to the inner ring drive second gear structure 1102. The inner ring drive second gear structure 1102 has a gear structure that meshes with the small gear portion of the inner ring drive first gear structure 1101. An inner ring drive third gear structure 1103 is fixedly connected to the upper end of the inner ring drive second gear structure 1102. Specifically, the lower surface of the inner ring drive third gear structure 1103 has a slot structure that matches the upper end of the inner ring drive second gear structure 1102, so that the upper end of the inner ring drive second gear structure 1102 is inserted into and interference-fitted with the center lower surface of the inner ring drive third gear structure 1103. An inner ring drive fourth gear structure 1104 is meshed with the inner ring drive third gear structure 1103. The inner ring drive fourth gear structure 1104 has a large gear part and a small gear part. The diameter of the large gear part is larger than the diameter of the small gear part. The large gear part on the inner ring drive fourth gear structure 1104 meshes with the gear on the inner ring drive third gear structure 1103. The upper end of the inner ring drive fourth gear structure 1104 is fixedly connected to the center of the inner ring scale 8.

[0028] When the pointer drives the second gear structure 1002 to rotate, the small gear part of the pointer drives the second gear structure 1002 to drive the large gear part on the inner ring drive first gear structure 1101 to rotate. The small gear part on the inner ring drive first gear structure 1101 drives the gear structure of the inner ring drive second gear structure 1102 to rotate. The upper end of the inner ring drive second gear structure 1102 then drives the rotation of the inner ring drive third gear structure 1103. The gear part of the inner ring drive third gear structure 1103 finally drives the large gear part of the inner ring drive fourth gear structure 1104 to rotate. Finally, the upper end of the inner ring drive fourth gear structure 1104 drives the inner ring dial 8 to rotate.

[0029] In this embodiment, as Figures 7-8As shown, the outer ring drive gear set 12 includes an outer ring drive first gear structure 1201, which has a large gear portion and a small gear portion. The large gear portion of the outer ring drive first gear structure 1201 meshes with the small gear portion of the inner ring drive fourth gear structure 1104. The outer ring drive first gear structure 1201 is also meshed with an outer ring drive second gear structure 1202. Specifically, the small gear portion of the outer ring drive first gear structure 1201 meshes with the gear structure of the outer ring drive second gear structure 1202. The upper end of the outer ring drive second gear structure 1202 is fixedly connected to the center of the outer ring scale 9.

[0030] When the inner ring drives the fourth gear structure 1104 to rotate, the small gear part of the inner ring drives the fourth gear structure 1104 to drive the large gear part on the outer ring drives the first gear structure 1201 to rotate. The small gear part on the outer ring drives the first gear structure 1201 to drive the gear structure on the outer ring drives the second gear structure 1202 to rotate. Finally, the upper end of the outer ring drives the second gear structure 1202 to drive the outer ring scale 9 to rotate.

[0031] In this embodiment, the center of the inner ring drive fourth gear structure 1104 and the center of the outer ring drive second gear structure 1202 are both hollow structures. The inner diameter of the central through-hole of the outer ring drive second gear structure 1202 is larger than the upper outer diameter of the inner ring drive fourth gear structure 1104, and the upper diameter of the pointer drive third gear structure 1003 is smaller than the inner diameter of the central through-hole of the inner ring drive fourth gear structure 1104. This allows the upper end of the pointer drive third gear structure 1003 to pass through the centers of the inner ring drive fourth gear structure 1104 and the outer ring drive second gear structure 1202. The end of the pointer body 6 is provided with a socket structure that matches the shape of the upper end of the pointer drive third gear structure 1003, allowing the upper end of the pointer drive third gear structure 1003 to be inserted into and press-fitted with the end through-hole of the pointer body 6, thereby achieving a fixed connection between the pointer drive third gear structure 1003 and the pointer body 6.

[0032] The upper end of the inner ring drive fourth gear structure 1104 passes through the center of the outer ring drive second gear structure 1202. The center of the inner ring scale 8 is provided with a through hole that matches the upper end of the inner ring drive fourth gear structure 1104, so that the upper end of the inner ring drive fourth gear structure 1104 is inserted into and interference-fitted with the center through hole of the inner ring scale 8, thereby realizing the fixed connection between the inner ring drive fourth gear structure 1104 and the inner ring scale 8.

[0033] The outer ring dial 9 has a central through hole that matches the shape of the upper end of the outer ring drive second gear structure 1202, so that the upper end of the outer ring drive second gear structure 1202 is inserted into and interference-fitted with the central through hole of the outer ring dial 9, thereby realizing the fixed connection between the outer ring drive second gear structure 1202 and the outer ring dial 9.

[0034] from Figure 3 It can be clearly seen that the size of each through hole gradually decreases, from the central through hole of the outer dial 9, the central through hole of the inner dial 8, the central through hole of the shielding plate 7, and the end through hole of the pointer body 6. This allows the upper end of the pointer drive third gear structure 1003 to pass sequentially through the central through holes of the outer dial 9, the inner dial 8, and the shielding plate 7, with clearance fit, and finally with an interference fit to the pointer body 6. The upper end of the inner dial drive fourth gear structure 1104 passes through the central through hole of the outer dial 9 with clearance fit, and then with an interference fit to the central through hole of the inner dial 8. The upper end of the outer dial drive second gear structure 1202 directly with an interference fit to the central through hole of the outer dial 9.

[0035] In this embodiment, as Figures 4-5 As shown, the mechanical turntable module 4 includes a gear set bracket 13, and the pointer drive gear set 10, the inner ring drive gear set 11 and the outer ring drive gear set 12 are all mounted on the gear set bracket 13.

[0036] The gear set support 13 includes an upper gear set support 1301, a middle gear set support 1302, and a lower gear set support 1303, which are fixed together by bolts. The lower gear portion of the pointer-driven first gear structure 1001 is located below the lower gear set support 1303, and the upper end of the pointer-driven first gear structure 1001 can pass through the corresponding through hole on the lower gear set support 1303. The large and small gear portions of the pointer-driven second gear structure 1002, the gear portions of the pointer-driven third gear structure 1003, the large and small gear portions of the inner ring driven first gear structure 1101, and the gear portions of the inner ring driven second gear structure 1102 are all located between the middle gear set support 1302 and the lower gear set support 1303. The lower ends of the inner ring drive first gear structure 1101 and the inner ring drive second gear structure 1102 are rotatably connected to corresponding through holes on the lower support 1303 of the gear set. The upper ends of the pointer drive third gear structure 1003 and the inner ring drive second gear structure 1102 can pass through the corresponding through holes of the middle support 1302 of the gear set. The gear portion of the inner ring drive third gear structure 1103, the large gear portion and the small gear portion of the inner ring drive fourth gear structure 1104, the large gear portion and the small gear portion of the outer ring drive first gear structure 1201, and the gear portion of the outer ring drive second gear structure 1202 are all located between the upper support 1301 and the middle support 1302 of the gear set. The upper ends of the pointer drive third gear structure 1003, the inner ring drive fourth gear structure 1104, and the outer ring drive second gear structure 1202 can all pass through the central through hole of the upper support 1301 of the gear set.

[0037] In this embodiment, as Figure 12 As shown, the mechanical turntable module 4 also includes an adjusting cover ring 14 and a turntable housing 15. A transparent scale 5 is bonded and fixed to the adjusting cover ring 14, and a shielding plate 7 is placed at the opening of the turntable housing 15. The outer wall of the turntable housing 15 has an annular protrusion, and the inner wall of the adjusting cover ring 14 has an annular groove. The annular protrusion is rotatably connected to the annular groove. A cover ring positioning bolt 16 is threadedly connected to the side wall of the turntable housing 15, and the end of the cover ring positioning bolt 16 can abut against the outer wall of the adjusting cover ring 14.

[0038] After prolonged use, the pointer body 6 may deviate from the alignment of the scale on the transparent dial 5. In this case, loosen the cover ring positioning bolt 16, then manually rotate and adjust the cover ring 14 and the transparent dial 5 so that the zero mark on the transparent dial 5 is aligned with the pointer body 6. Then tighten the cover ring positioning bolt 16 to complete the alignment of the pointer body 6.

[0039] In this embodiment, the reading window 701 has triangular outer and inner indicator arrows on both sides. The outer indicator arrow indicates the scale on the outer dial 9, which represents the tens digit. If the scale on the outer dial 9 is a two-digit number, it represents the hundreds and tens digits, with the unit being mm. The inner indicator arrow indicates the scale on the inner dial 8, which represents the units digit, with the unit being mm. The circular scale on the transparent dial 5 is divided into 100 parts, meaning that one revolution of the pointer body 6 on the transparent dial 5 corresponds to one millimeter, with an accuracy of 0.01 mm.

[0040] It should be noted that, in this embodiment, the number of teeth of each gear in the pointer drive gear set 10, the inner ring drive gear set 11, and the outer ring drive gear set 12 can be adjusted according to actual needs, and is not limited to one type. Therefore, the specific number of teeth of each gear is not limited here.

[0041] In this embodiment, as Figures 9-11 As shown, one end of the rack body 3 is provided with a rack limiting protrusion 301, and the main scale body 1 is provided with a rack limiting groove 101. When the rack body 3 is installed on the main scale body 1, the rack limiting protrusion 301 is located in the rack limiting groove 101. A rack adjusting bolt 17 is threadedly connected to the rack limiting protrusion 301. The rack adjusting bolt 17 can pass through the side wall of the rack limiting groove 101. When the rack adjusting bolt 17 is turned, the rack body 3 can move along the length direction of the rack adjusting bolt 17.

[0042] like Figure 10 As shown, a rack fixing bolt 18 is also threaded onto the rack body 3, and the main scale body 1 is provided with a strip groove 102. The large end of the rack fixing bolt 18 can abut against the inner wall of the strip groove 102.

[0043] When the mechanical turntable module 4 needs to be calibrated, first loosen the rack fixing bolt 18 to separate the large end of the rack fixing bolt 18 from the inner wall of the slot 102, thus eliminating the force between the rack fixing bolt 18 and the slot 102. Then rotate the rack adjusting bolt 17 to move the rack limiting protrusion 301 and the rack body 3 along the length of the rack adjusting bolt 17, thereby adjusting the mechanical turntable module 4. After the scale is calibrated, tighten the rack fixing bolt 18 to achieve the calibration and fixation of the rack body 3.

[0044] In this embodiment, the end of the rack adjusting bolt 17 is provided with a bolt limiting part 1701, the diameter of which is larger than the diameter of both ends of the rack adjusting bolt 17. The end of the main scale body 1 is fixedly connected to the end cover plate 19 by bolts. The adjacent surfaces of the main scale body 1 and the end cover plate 19 are each provided with a bolt limiting groove 20. The bolt limiting part 1701 is located in the cavity between the two bolt limiting grooves 20, and one end of the rack adjusting bolt 17 can pass through the bottom of the bolt limiting groove 20 on the end cover plate 19, which facilitates the user to rotate the rack adjusting bolt 17. The purpose of this design is that when the rack adjusting bolt 17 is turned, the bolt limiting groove 20 on the main scale body 1 and the end cover plate 19 forms a closed cavity, and the volume of the closed cavity matches the volume of the bolt limiting part 1701. When the rack adjusting bolt 17 is rotated, the rack adjusting bolt 17 itself will not move along the length direction of the rack adjusting bolt 17, thereby achieving the technical effect that the rack body 3 can be driven to move in a straight line when the rack adjusting bolt 17 is rotated.

[0045] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0046] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).

[0048] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this utility model to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0049] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0050] It should be noted that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0051] It should also be noted that in the embodiments of this application, the same reference numerals are used to denote the same component or the same part.

[0052] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0053] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A mechanical rotary vernier caliper, characterized in that: It includes a main scale body (1) and a vernier scale (2). The vernier scale (2) is provided with a sliding groove. The main scale body (1) is slidably connected to the sliding groove. The main scale body (1) is provided with a rack body (3). A mechanical turntable module (4) is fixed on the vernier scale (2). The mechanical turntable module (4) includes a transparent dial (5), a pointer body (6), a shielding plate (7), an inner dial (8), an outer dial (9), a pointer drive gear set (10), an inner drive gear set (11), and an outer drive gear set (12). The transparent dial (5) is set with graduations. The pointer body (6) is located between the transparent dial (5) and the shielding plate (7). The inner dial (8) is located inside the outer dial (9). The inner dial (8) and the outer dial (9) are located on the shielding plate. (7) On the side away from the pointer body (6), the shielding disk (7) is provided with a reading window (701). The pointer drive gear set (10) is connected to the rack body (3) in a transmission connection. The pointer drive gear set (10) is connected to the pointer body (6) in a transmission connection. The pointer drive gear set (10) is connected to the inner ring drive gear set (11) in a transmission connection. The inner ring drive gear set (11) is connected to the inner ring scale (8) in a transmission connection. The inner ring drive gear set (11) is connected to the outer ring drive gear set (12) in a transmission connection. The outer ring drive gear set (12) is connected to the outer ring scale (9) in a transmission connection.

2. The mechanical rotary vernier caliper according to claim 1, characterized in that: The pointer drive gear set (10) includes a pointer drive first gear structure (1001), the lower end of which meshes with the rack body (3), the upper end of which is fixed with a pointer drive second gear structure (1002), the pointer drive second gear structure (1002) is also meshed with a pointer drive third gear structure (1003), and the upper end of which is fixedly connected to one end of the pointer body (6).

3. The mechanical rotary vernier caliper according to claim 2, characterized in that: The inner ring drive gear set (11) includes an inner ring drive first gear structure (1101), which meshes with the pointer drive second gear structure (1002). The inner ring drive first gear structure (1101) is meshed with the inner ring drive second gear structure (1102). The upper end of the inner ring drive second gear structure (1102) is fixedly connected to the inner ring drive third gear structure (1103). The inner ring drive third gear structure (1103) is meshed with the inner ring drive fourth gear structure (1104). The upper end of the inner ring drive fourth gear structure (1104) is fixedly connected to the center of the inner ring scale (8).

4. The mechanical rotary vernier caliper according to claim 3, characterized in that: The outer ring drive gear set (12) includes an outer ring drive first gear structure (1201), which meshes with the inner ring drive fourth gear structure (1104). The outer ring drive first gear structure (1201) is also meshed with an outer ring drive second gear structure (1202), and the upper end of the outer ring drive second gear structure (1202) is fixedly connected to the center of the outer ring scale (9).

5. The mechanical rotary vernier caliper according to claim 4, characterized in that: The upper end of the pointer-driven third gear structure (1003) can pass through the center of the inner ring-driven fourth gear structure (1104) and the center of the outer ring-driven second gear structure (1202), and the upper end of the pointer-driven third gear structure (1003) is interference-fitted with the end through hole of the pointer body (6). The upper end of the inner ring drive fourth gear structure (1104) passes through the center of the outer ring drive second gear structure (1202), and the upper end of the inner ring drive fourth gear structure (1104) is interference-fitted with the center through hole of the inner ring scale (8). The upper end of the outer ring drive second gear structure (1202) is interference-fitted with the center through hole of the outer ring scale (9).

6. The mechanical rotary vernier caliper according to claim 1, characterized in that: The mechanical turntable module (4) includes a gear set bracket (13), and the pointer drive gear set (10), the inner ring drive gear set (11) and the outer ring drive gear set (12) are all mounted on the gear set bracket (13); The gear set bracket (13) includes an upper gear set bracket (1301), a middle gear set bracket (1302), and a lower gear set bracket (1303), which are fixed together by bolts.

7. The mechanical rotary vernier caliper according to claim 1, characterized in that: The mechanical turntable module (4) also includes an adjustment cover ring (14) and a turntable housing (15). The transparent dial (5) is fixed on the adjustment cover ring (14). The outer wall of the turntable housing (15) is provided with an annular protrusion. The inner wall of the adjustment cover ring (14) is provided with an annular groove. The annular protrusion is rotatably connected to the annular groove. The side wall of the turntable housing (15) is threaded with a cover ring positioning bolt (16). The end of the cover ring positioning bolt (16) can abut against the outer wall of the adjustment cover ring (14).

8. The mechanical rotary vernier caliper according to claim 1, characterized in that: The reading window (701) is provided with an outer ring indicator arrow and an inner ring indicator arrow on both sides.

9. The mechanical rotary vernier caliper according to claim 1, characterized in that: One end of the rack body (3) is provided with a rack limiting protrusion (301), and the main scale body (1) is provided with a rack limiting groove (101). The rack limiting protrusion (301) is threadedly connected to a rack adjusting bolt (17). The rack body (3) is also threaded with a rack fixing bolt (18), and the main scale body (1) is provided with a strip groove (102). The end of the rack fixing bolt (18) can abut against the inner wall of the strip groove (102).

10. The mechanical rotary vernier caliper according to claim 9, characterized in that: The end of the rack adjusting bolt (17) is provided with a bolt limiting part (1701), and the end of the main scale body (1) is connected with an end cover plate (19). The adjacent surfaces of the main scale body (1) and the end cover plate (19) are each provided with a bolt limiting groove (20), and the bolt limiting part is located in the bolt limiting groove (20).

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