Differential thread fine adjustment mechanism and combined image gradienter

Abstract

The utility model discloses a differential thread fine adjustment mechanism and a combined image gradienter. The differential thread fine adjustment mechanism is used for the combined image gradienter, the combined image gradienter comprises a shell and a lever device, the lever device is arranged in the shell, the differential thread fine adjustment mechanism comprises a micrometric screw movably connected with the shell, and at least part of the micrometric screw is located outside the shell; the micrometric screw is sleeved with the middle nut, and the micrometric screw is connected with the middle nut through a first thread; the middle nut is sleeved with the movable nut, the middle nut is connected with the movable nut through a second thread, and the movable nut is connected with the lever device. Displacement is generated through different screw pitch differences of the middle nut and the movable nut, high-precision micro movement can be achieved by adopting a common thread standard screw pitch, machining cost increase caused by the screw pitch smaller than the minimum screw pitch and clamping stagnation in the using process are avoided, and the using reliability and stability of the differential thread fine adjustment mechanism are improved.

Description

Technical Field

[0001] This utility model relates to the field of precision measurement technology, and in particular to a differential thread fine-tuning mechanism and a convergence level. Background Technology

[0002] The coincidence level is mainly used to measure the straightness and flatness of parts surfaces, and for measuring the level and small tilt angles of equipment installation positions. It is widely used in the precision machinery industry for the inspection and adjustment of the flatness and straightness of machine beds, guide rails, and worktables, as well as for the leveling and debugging of various equipment installations. The coincidence level mainly consists of a fine-adjustment screw, nut, micrometer dial, level, prism, magnifying glass, lever, and a base with flat and V-shaped working surfaces. Among these components, the fine-adjustment screw plays a crucial role in zero-position adjustment and the accuracy of the micrometer dial reading.

[0003] Existing image level instruments such as Figure 1a and Figure 1b As shown, the aligning level includes a level 4' housed within a housing 5' and mounted on the base plate of a lever frame. Its position can be adjusted using a fine-adjustment knob 2' via a fine-adjustment screw 3' and lever system 6'. The bubble within the level 4' is reflected by two prisms at different positions to the observation window 1' for magnified observation (divided into two half-images). When the level 4' is not in a horizontal position, the two halves of the bubble, A and B, are misaligned, as shown... Figure 1b As shown, when the level 4' is in the horizontal position, the two halves of the bubble A and B are aligned, as shown. Figure 1c As shown. Rotate the fine adjustment knob 2' until the two bubble images overlap, at which point the reading can be obtained.

[0004] Currently, the micro-adjustment structure uses a micro-screw and nut configuration. The micro-screw has an M8 thread diameter and a pitch of P = 0.5mm. In the standard thread pitch series, the minimum pitch is 0.75mm. The smaller-than-specified thread pitch on the micro-screw inevitably leads to greater difficulty in thread machining and lower manufacturing precision. If the micro-screw's manufacturing precision is incorrect, it will cause uneven rotation, jamming, or jumping. This will result in unstable movement of the bubble in the level, causing stagnation and jumping, leading to reading errors. Therefore, ensuring manufacturing precision inevitably increases manufacturing costs. Furthermore, the M8 micro-screw's thread thickness is only 0.25mm, which is thin, has low strength, and poor wear resistance, affecting the micro-screw's lifespan. Utility Model Content

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0006] In view of this, the present invention provides a differential thread fine-tuning mechanism and a coincidence level, wherein the differential thread fine-tuning mechanism can generate displacement through the different pitch difference between the intermediate nut and the movable nut, and can achieve high-precision micro-movement by using the standard pitch of ordinary thread, avoiding the increase in processing cost and jamming during use caused by the pitch being less than the minimum pitch, thereby improving the reliability and stability of the differential thread fine-tuning mechanism.

[0007] Specifically, the following technical solutions are included:

[0008] An embodiment of the first aspect of this utility model provides a differential thread fine-tuning mechanism for a convergence level, the convergence level including a housing and a lever device, the lever device being disposed within the housing, and the differential thread fine-tuning mechanism including:

[0009] A micrometer screw is movably connected to the housing, and at least a portion of the micrometer screw is located outside the housing;

[0010] An intermediate nut is fitted onto the micrometer screw, and the micrometer screw and the intermediate nut are connected by a first thread.

[0011] The movable nut is fitted onto the intermediate nut, and the intermediate nut and the movable nut are connected by a second thread. The movable nut is connected to the lever device.

[0012] Optionally, the differential thread fine-tuning mechanism further includes:

[0013] A micro-adjustment knob is fixedly connected to the micrometer screw, and the micro-adjustment knob is located outside the housing.

[0014] Optionally, the differential thread fine-tuning mechanism further includes:

[0015] A micrometer disk is disposed between the housing and the micro-motion knob, and the micrometer disk is sleeved on the micrometer screw. The micrometer disk has uniformly distributed scale lines on its circumference, and the micrometer disk is fixedly connected to the housing.

[0016] Optionally, the first thread includes a first external thread disposed on the micrometer screw and a first internal thread disposed in the intermediate nut, wherein the pitch of the first thread is P1.

[0017] Optionally, the second thread includes a second external thread disposed outside the intermediate nut and a second internal thread disposed inside the movable nut, wherein the pitch of the second thread is P2, P2 > P1.

[0018] Optionally, when the micrometer screw rotates one revolution, the movable nut moves a distance L = P2 - P1, and the first thread and the second thread have the same direction of rotation.

[0019] Optionally, the micrometer screw is an M8, M10, or M12 screw.

[0020] Optionally, the diameter of the second internal thread is M12, M14 or M16.

[0021] A second aspect of the present invention provides a alignment level, the alignment level comprising:

[0022] case;

[0023] A lever device is disposed within the housing; and

[0024] The differential thread fine-tuning mechanism described above is fixedly connected to the lever device.

[0025] Optionally, the lever device includes:

[0026] A lever is disposed within the housing;

[0027] A lever support, one end of which is fixedly connected to the housing, and the other end of which is movably connected to the lever;

[0028] The differential thread fine-tuning mechanism is fixedly connected to the lever.

[0029] This utility model provides a differential thread fine-tuning mechanism and a convergence level. The differential thread fine-tuning mechanism includes a micrometer screw, an intermediate nut fitted onto the micrometer screw, and a movable nut fitted onto the intermediate nut. When the micrometer screw is rotated, it drives the intermediate nut to rotate. Since the movable nut is fixedly connected to the lever device, it cannot rotate with the intermediate nut and therefore moves along the axis of the micrometer screw. In other words, by utilizing the pitch difference between the intermediate nut and the movable nut, a small displacement is generated, and the balance of the lever device is adjusted through the small displacement of the movable nut, thus achieving a small movement of the lever device. It eliminates the need to machine threads with a pitch smaller than the minimum standard pitch, thereby reducing machining difficulty and cost, ensuring the thread thickness requirements, and improving the service life of the micrometer screw. Simultaneously, it ensures machining accuracy, avoids jamming and jumping during micrometer screw rotation, guarantees the reliability and stability of the convergence level, and improves the accuracy of the convergence level readings.

[0030] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of 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.

[0032] Figure 1a This is a schematic diagram of a prior art image leveling instrument;

[0033] Figure 1b This is a schematic diagram of the internal structure of a conventional image leveling instrument.

[0034] Figure 1c This is a schematic diagram showing the level when it is not in a horizontal position.

[0035] Figure 1d This is a schematic diagram of the level when it is in a horizontal position.

[0036] Figure 2 This is a schematic diagram of a differential thread fine-tuning mechanism according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of a convergence level according to an embodiment of the present invention.

[0038] The correspondence between the reference numerals and component names in Figure 1 is as follows:

[0039] 1' Observation window, 2' Micro-adjustment knob, 3' Micro-adjustment screw, 4' Level, 5' Housing, 6' Lever system;

[0040] Figure 2 and Figure 3 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0041] 1. Micro-motion knob, 2. Micrometer dial, 3. Housing, 4. Micrometer screw, 5. Center nut, 6. Movable nut, 7. Lever device. Detailed Implementation

[0042] 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, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0043] Before providing a further detailed description of the embodiments of this utility model, the directional terms used in the embodiments of this utility model, such as "upper part", "lower part" and "side part", do not have the meaning of limiting the scope of protection of this utility model.

[0044] To make the technical solution and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0045] Figure 2 This is a schematic diagram of a differential thread fine-tuning mechanism according to an embodiment of the present invention;

[0046] like Figure 2 As shown, one embodiment of this utility model provides a differential thread fine-tuning mechanism for a coincidence level. The coincidence level includes a housing 3 and a lever device 7, the lever device 7 being disposed within the housing 3. The differential thread fine-tuning mechanism includes:

[0047] The micrometer screw 4 is movably connected to the housing 3, and at least part of the micrometer screw 4 is located outside the housing 3;

[0048] The intermediate nut 5 is sleeved on the micrometer screw 4, and the micrometer screw 4 and the intermediate nut 5 are connected by the first thread.

[0049] The movable nut 6 is fitted onto the intermediate nut 5. The intermediate nut 5 and the movable nut 6 are connected by a second thread. The movable nut 6 is connected to the lever device 7.

[0050] The differential thread fine-tuning mechanism includes a micrometer screw 4, an intermediate nut 5 fitted onto the micrometer screw 4, and a movable nut 6 fitted onto the intermediate nut 5. When the micrometer screw 4 is rotated, it drives the intermediate nut 5 to rotate. Since the movable nut 6 is fixedly connected to the lever device 7, it cannot rotate with the intermediate nut 5 and therefore moves along the axis of the micrometer screw 4. In other words, by utilizing the pitch difference between the intermediate nut 5 and the movable nut 6, a small displacement is generated, which in turn adjusts the balance of the lever device 7, achieving a small movement of the lever device 7. This eliminates the need to machine threads with a pitch smaller than the minimum standard pitch, thus reducing machining difficulty and cost, ensuring the thread thickness requirements, and improving the service life of the micrometer screw 4. Simultaneously, it ensures machining accuracy, avoids jamming and jumping during the rotation of the micrometer screw 4, guarantees the reliability and stability of the alignment level, and improves the accuracy of the alignment level readings.

[0051] Specifically, this application utilizes a threaded transmission mechanism composed of two helical pairs. By leveraging the difference in pitch between the two helical pairs (the intermediate nut 5 and the movable nut 6), a differential movement is generated between the movable nut 6 and the micrometer screw 4. This differential movement achieves high-precision micro-movement by utilizing the difference in pitch to generate minute displacements. The differential threaded fine-tuning mechanism can be applied to precision adjustment mechanisms and micrometer mechanisms. For example, besides convergence level instruments, it can also be applied to fixture fine-tuning mechanisms, and so on.

[0052] It should be noted that the pitch of the intermediate nut 5 and the movable nut 6 in this application can adopt the standard pitch of ordinary threads, which reduces the difficulty of production, ensures smooth movement on the thread, reduces the difficulty of production, and at the same time avoids the thread teeth being too thin, which would affect the strength and wear resistance of the thread. In other words, it can improve the service life of the micrometer screw 4, the intermediate nut 5 and the movable nut 6, while meeting the requirements of economic production and accuracy of use.

[0053] In one feasible implementation, the differential thread fine-tuning mechanism further includes:

[0054] The micro-motion knob 1 is fixedly connected to the micrometer screw 4, and the micro-motion knob 1 is located outside the housing 3.

[0055] Due to space constraints, the micrometer screw 4 typically has a small diameter. Manually rotating it would cause hand pain and affect accuracy. Therefore, the micrometer screw 4, located outside the housing 3, is fixedly connected to the micro-adjustment knob 1. Rotating the knob drives the micrometer screw 4, thus moving the intermediate nut 5 and the movable nut 6. Since the diameter of the micro-adjustment knob 1 is outside the housing 3, it is unrestricted, allowing for easy and precise rotation.

[0056] It is understandable that a bearing can be installed at the connection between the micrometer screw 4 and the housing 3 to provide rotational support for the micrometer screw 4. Alternatively, a bearing bush or a self-lubricating copper sleeve can be installed between the micrometer screw 4 and the housing 3 to achieve rotational support, and these methods will not be listed here.

[0057] In one feasible implementation, the differential thread fine-tuning mechanism further includes:

[0058] The micrometer disk 2 is located between the housing 3 and the micro-motion knob 1, and the micrometer disk 2 is sleeved on the micrometer screw 4. The micrometer disk 2 has scale lines evenly distributed around its circumference, and the micrometer disk 2 is fixedly connected to the housing 3.

[0059] A micrometer disk 2 is set between the micrometer knob 1 and the housing 3. In order to facilitate accurate reading after the micrometer knob 1 drives the micrometer screw 4 to rotate, a scale line is set on the micrometer disk 2 to divide the circular micrometer disk 2 into 100 equal parts. A pointer line is set on the micrometer knob 1. Rotate the micrometer knob 1 until the two halves of the bubble A and B are aligned. Find the position where the pointer line is aligned with the scale line of the micrometer disk 2, and you can read the number of divisions on the micrometer disk 2, and then obtain the lifting data of the lever device 7.

[0060] In one feasible implementation, the first thread includes a first external thread disposed on the micrometer screw 4 and a first internal thread disposed in the intermediate nut 5, the pitch of the first thread being P1.

[0061] The micrometer screw 4 and the intermediate nut 5 are connected by a first thread. A first external thread is provided on the micrometer screw 4, and a first internal thread is provided in the intermediate nut 5. The first internal thread and the second external thread are matched, that is, the pitch of the first thread is P1.

[0062] It should be noted that the first thread does not require additional, more precise machining. The minimum pitch of the fine thread in the existing standard can be used, which reduces machining accuracy, thereby reducing production costs, improving economy, and also avoiding jamming and jumping phenomena in the rotation of the micrometer screw.

[0063] In one feasible implementation, the second thread includes a second external thread disposed outside the intermediate nut 5 and a second internal thread disposed inside the movable nut 6, wherein the pitch of the second thread is P2, P2 > P1.

[0064] Similarly, the intermediate nut 5 and the movable nut 6 are connected by a second thread. A second external thread is provided on the outside of the intermediate nut 5, and a second internal thread is provided inside the movable nut 6. The second internal thread and the second external thread match, meaning the pitch of the second thread is P2. The second thread does not require additional, more precise machining; the pitch of a fine-pitch thread in the existing standard is sufficient. This reduces machining accuracy, thereby reducing production costs, improving economy, and also preventing jamming and runout of the micrometer screw.

[0065] The reading principle of the level is as follows: Taking a level with a specification of 200mm and a range of 0-10mm as an example, the operator faces the level, with the fine adjustment knob 1 on the right-hand side and the left end as the reference zero point. The reading value is the degree of inclination of the right end relative to the left end. If the right end is higher than the left end, the reading value is positive; otherwise, the reading value is negative. That is, when the fine adjustment knob 1 is rotated clockwise, only when the movable nut 6 moves downward can the right end of the lever be pressed down and the left end of the lever be raised, adjusting the level 4' to a horizontal position. At this time, the indicator line of the fine adjustment knob 1 is located to the right of the zero mark of the micrometer dial 2, which is also the number of divisions that the right end is higher than the left end, i.e., a positive value. Therefore, it can be understood that the pitch of the second thread must be greater than the pitch of the first thread, i.e., P2 > P1, to ensure that when the fine adjustment knob 1 is rotated clockwise, the movable nut 6 moves downward.

[0066] It should be noted that in this embodiment, the height of the movable nut 6 is higher than that of the intermediate nut 5, which ensures that the intermediate nut 5 can move within the movable nut 6, preventing it from falling out and affecting the normal operation of the differential thread fine-tuning mechanism. The travel distance of the movable nut 6 directly reflects the measuring range of the coincidence level (0-10mm). Taking a first thread pitch P1 = 0.75 and a second thread pitch P2 = 1.25 as an example, the intermediate nut 5 needs to rotate at least 20 times to ensure the movable nut 6 moves 10mm. Considering the thickness and safety margin of the intermediate nut 5, its height is at least 3 to 4 times the pitch of the first thread, i.e., 2.25mm to 3mm. The thickness of the movable nut 6 is at least 22 times the pitch of the second thread, i.e., 27.5mm.

[0067] In one feasible implementation, when the micrometer screw 4 rotates one revolution, the movable nut 6 moves a distance L = P2 - P1, and the first thread and the second thread have the same direction of rotation.

[0068] When both the first and second threads are right-hand fine-pitch ordinary threads, facing the micro-adjustment knob 1, when the knob 1 is rotated clockwise, the micrometer screw 4 rotates clockwise, causing the intermediate nut 5 to rotate and move upwards. Since the movable nut 6 is fixedly connected to the lever device 7, it cannot rotate with the intermediate nut 5 and can only move downwards along the axis of the micrometer screw 4. Because the intermediate nut 5 and the movable nut 6 have the same direction of rotation, and the movable nut 6 does not rotate but only moves, the downward movement distance L of the movable nut 6 is P2-P1. When the micro-adjustment knob 1 is rotated counterclockwise, the micrometer screw 4 rotates counterclockwise, causing the intermediate nut 5 to rotate and move downwards. Since the movable nut 6 is fixedly connected to the lever device 7, it cannot rotate with the intermediate nut 5 and can only move upwards along the axis of the micrometer screw 4. Because the intermediate nut 5 and the movable nut 6 have the same direction of rotation, and the movable nut 6 does not rotate but only moves, the upward movement distance L of the movable nut 6 is P2-P1.

[0069] Similarly, when both the first and second threads are left-hand fine-pitch ordinary threads, facing the micro-adjustment knob 1, when the micro-adjustment knob 1 is rotated clockwise, the micrometer screw 4 rotates clockwise, causing the intermediate nut 5 to rotate and move downwards. Since the movable nut 6 is fixedly connected to the lever device 7, it cannot rotate with the intermediate nut 5, but can only move upwards along the axis of the micrometer screw 4. Because the intermediate nut 5 and the movable nut 6 have the same direction of rotation, and the movable nut 6 does not rotate but only moves, the upward movement distance L of the movable nut 6 is P2-P1. When the micro-adjustment knob 1 is rotated counterclockwise, the micrometer screw 4 rotates counterclockwise, causing the intermediate nut 5 to rotate and move upwards. Since the movable nut 6 is fixedly connected to the lever device 7, it cannot rotate with the intermediate nut 5, but can only move downwards along the axis of the micrometer screw 4. Because the intermediate nut 5 and the movable nut 6 have the same direction of rotation, and the movable nut 6 does not rotate but only moves, the downward movement distance L of the movable nut 6 is P2-P1.

[0070] It should be noted that since the movable nut 6 is fixedly connected to the lever device 7, it exerts a force on the intermediate nut 5. Therefore, when the micrometer screw 4 rotates, the intermediate nut 5 can also move on the micrometer screw 4.

[0071] In one feasible implementation, the micrometer screw 4 is an M8, M10, or M12 screw.

[0072] Among them, the micrometer screw 4 can usually be an M8, M10 or M12 screw, that is, the diameter of the first internal thread and the first external thread is M8, M10 or M12, and at the same time, a right-hand fine-pitch ordinary thread or a left-hand fine-pitch ordinary thread with the corresponding diameter pitch can be selected.

[0073] In one feasible implementation, the diameter of the second internal thread is M12, M14, or M16.

[0074] The diameter of the second internal thread is M12, M14, or M16, and the corresponding diameter of the second external thread is also M12, M14, or M16. A right-hand fine-pitch or left-hand fine-pitch ordinary thread with the corresponding diameter and pitch can be selected. This ensures that the first and second threads have the same direction of rotation.

[0075] In this embodiment, the first thread is a right-hand fine-pitch ordinary thread with a diameter of M8 and a pitch of 0.75mm, and the second thread is a right-hand fine-pitch ordinary thread with a diameter of M14 and a pitch of 1.25mm. When the micro-motion knob 1 rotates clockwise one revolution, the micrometer screw 4 rotates clockwise, causing the intermediate nut 5 to rotate clockwise. Since the intermediate nut 5 is threadedly connected to the movable nut 6, and the movable nut 6 is fixedly connected to the lever device 7, the intermediate nut 5 rotates and moves upward by 0.75mm, while the movable nut 6 cannot rotate. Therefore, the movable nut 6 moves downward by 1.25mm relative to the intermediate nut 5, and the downward movement of the movable nut 6 relative to the micrometer screw 4 is L = 1.25 - 0.75 = 0.5mm. That is to say, when the micro-motion knob 1 rotates one revolution, the movable nut 6 moves upward or downward by a distance of 0.5mm. It can be understood that the upward and downward movement of the movable nut 6 depends on the rotation direction of the micro-motion knob 1.

[0076] It should be noted that since the moving nut 6 moves 0.5mm when the micro-knob 1 rotates one revolution, and the micrometer disk 2 is divided into 100 equal grids, the moving nut 6 moves 0.5 / 100 = 0.005mm when the micro-knob 1 rotates one grid. Thus, the sensitivity of the differential thread fine-tuning mechanism can be guaranteed without increasing the manufacturing difficulty of the micrometer screw 4 thread.

[0077] For example, the first thread can be a right-hand (left-hand) fine-pitch ordinary thread with a diameter of M10 and a pitch of 1.0mm, while the second thread can be a right-hand (left-hand) fine-pitch ordinary thread with a diameter of M16 and a pitch of 1.5mm; or the first fine thread can be a right-hand (left-hand) fine-pitch ordinary thread with a diameter of M12 and a pitch of 1.0mm, while the second thread can be a right-hand (left-hand) fine-pitch ordinary thread with a diameter of M16 and a pitch of 1.5mm. The key is to ensure that the pitch difference between the first and second threads is 0.5mm while meeting the installation space requirements.

[0078] It is understandable that if the pitch difference (the difference between the first pitch and the second pitch) is too small, the sensitivity and accuracy of the lever device 7 will need to be increased, which will increase the manufacturing difficulty of the lever device 7. Therefore, in this embodiment, the difference between the second pitch and the first pitch is selected as 0.5mm, which can meet the measurement requirements while reducing the production difficulty and improving the economy.

[0079] Figure 3 This is a schematic diagram of a convergence level according to an embodiment of the present invention.

[0080] like Figure 3 As shown, another embodiment of this utility model provides a convergence level, which includes:

[0081] Casing 3;

[0082] Lever device 7, disposed within housing 3; and

[0083] The differential thread fine-tuning mechanism described above is fixedly connected to the lever device 7.

[0084] The optical coincidence level uses a prism to magnify the bubble image in the level, improving reading accuracy. A lever device 7 and a differential screw fine-tuning mechanism enhance reading sensitivity. The level primarily serves to indicate zero. To use the optical coincidence level, place it on the work surface being inspected. If the surface is tilted, causing the two bubbles to misalign, rotate the differential screw fine-tuning mechanism until they align. The actual tilt of the inspected workpiece can then be read. The reading is not directly from the level itself, but rather obtained through the convergence of the bubble images after refraction by a prism, magnified by an eyepiece. This provides accurate readings with minimal impact from ambient temperature changes. The optical coincidence level features a simple and intuitive interface, is easy to operate, and is compact, making it suitable for use in field or construction environments.

[0085] It should be noted that since the image level instrument in this embodiment adopts the differential thread fine adjustment mechanism described above, it possesses all the advantages of the differential thread fine adjustment mechanism described above, and will not be repeated here.

[0086] In practical applications, the lever device 7 of the alignment level can detect very small tilt changes. For example, when the measured object tilts by 0.01 mm / m, the alignment level can accurately read this minute change. This high sensitivity and high accuracy reading makes the alignment level widely used in various occasions requiring high-precision measurements.

[0087] In one feasible implementation, the lever device 7 includes:

[0088] The lever is located inside housing 3;

[0089] A lever support, one end of which is fixedly connected to the housing 3, and the other end of which is movably connected to the lever;

[0090] The differential thread fine-tuning mechanism is fixedly connected to the lever.

[0091] It should be noted that the lever device 7 is used to improve the sensitivity of the image level reading. Specifically, the image level uses optical components to magnify and composite the bubble image, and the lever device 7 enhances the sensitivity of the reading. When the measured object is tilted, the lever device 7 can accurately reflect this minute change, making the reading more accurate.

[0092] Specifically, the lever device 7 mainly consists of a lever and a lever support, used to transmit the minute movement of the movable nut 6 in the differential thread. When the image level is tilted, the lever device 7 is driven to transmit this movement by adjusting the differential thread fine-tuning mechanism, thereby making the reading more sensitive.

[0093] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0094] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0095] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A differential screw fine adjustment mechanism for a combined level, the combined level comprising a housing and a lever arrangement, the lever arrangement being disposed within the housing, characterised in that, The differential screw fine adjustment mechanism comprises: a micrometer screw movably connected to the housing, and at least part of the micrometer screw is located outside the housing; a middle nut sleeved on the micrometer screw, the micrometer screw and the middle nut being connected through a first thread; a movable nut sleeved on the middle nut, the middle nut and the movable nut being connected through a second thread, and the movable nut being connected to the lever device.

2. The differential screw micrometer mechanism according to claim 1, wherein, The differential screw fine adjustment mechanism further comprises: a micro-motion knob fixedly connected to the micrometer screw, and the micro-motion knob being located outside the housing.

3. The differential screw micrometer mechanism according to claim 2, wherein, The differential screw fine adjustment mechanism further comprises: a differential disc arranged between the housing and the micro-motion knob, and the differential disc being sleeved on the micrometer screw, the differential disc being uniformly provided with scale lines in the circumferential direction, and the differential disc being fixedly connected to the housing.

4. The differential screw micrometer mechanism according to claim 1, wherein, The first thread comprises a first external thread arranged on the micrometer screw and a first internal thread arranged in the middle nut, and the pitch of the first thread is P1.

5. The differential screw micrometer mechanism according to claim 4, wherein, The second thread comprises a second external thread arranged on the middle nut and a second internal thread arranged in the movable nut, and the pitch of the second thread is P2, P2>P1.

6. The differential screw micrometer mechanism according to claim 5, wherein When the micrometer screw rotates one revolution, the distance L moved by the movable nut is P2-P1, and the rotation directions of the first thread and the second thread are the same.

7. The differential screw micrometer mechanism according to claim 4, wherein The micrometer screw is an M8, M10 or M12 screw.

8. The differential screw micrometer mechanism according to claim 5, wherein, The diameter of the second internal thread is M12, M14 or M16.

9. A combined level, characterized in that The combined level comprises: a housing; a lever device arranged in the housing; and the differential screw fine adjustment mechanism according to any one of claims 1 to 8, which is fixedly connected to the lever device.

10. The compound level according to claim 9, characterized in that The lever device comprises: a lever arranged in the housing; a lever support, one end of the lever support being fixedly connected to the housing, and the other end of the lever support being movably connected to the lever; wherein the differential screw fine adjustment mechanism is fixedly connected to the lever.

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