Differential thread fine adjustment mechanism and combined image gradienter

Abstract

The invention 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] The invention relates to the field of precision measurement technology, and in particular to a differential thread fine-tuning mechanism and a coincidence level. Background Art

[0002] The coincidence level is mainly used to measure the straightness and flatness of the surface of parts, and to measure the level and small inclination of the equipment installation position. It is widely used in the precision machinery industry to detect and adjust the flatness and straightness of the bed, guide rails, and worktable, as well as the installation level debugging of various equipment. The coincidence level is mainly composed of micro screws, nuts, differential disks, levels, prisms, magnifying glasses, levers, and bases with flat and V-shaped working surfaces. Among them, the micro screw plays a key role in zero adjustment and the accuracy of the differential disk indication.

[0003] Existing coincidence level instruments are as follows Figure 1a and Figure 1b As shown, the coincident level includes a level 4' disposed in a housing 5' and mounted on the bottom plate of a lever frame, and its position can be adjusted by a micro-motion knob 2' through a micro-motion screw 3' and a lever system 6'. The bubble in the level 4' is reflected by two prisms at different positions to the observation window 1' for magnified observation (divided into two half coincident images). When the level 4' is not in a horizontal position, the two halves of the bubble A and B are not aligned, as shown in FIG. Figure 1b As shown, when the level 4' is in a horizontal position, the two halves of the bubble A and B are aligned, as shown in FIG. Figure 1c Turn the micro-motion knob 2' until the two bubbles overlap, and then the reading can be obtained.

[0004] At present, the fine-tuning structure adopts a micro-screw and nut structure, with a micro-screw thread diameter of M8 and a pitch of P = 0.5mm. In the standard thread pitch series, the minimum pitch is 0.75mm. The precision thread pitch on the micro-screw is smaller than the specified value, which is bound to make thread processing difficult and manufacturing precision low. If there is an error in the manufacturing precision of the micro-screw, it will cause uneven rotation, stuck or jumping. As a result, the bubble of the level gauge moves unsteadily, stagnating and jumping, resulting in reading indication errors. Therefore, in order to ensure manufacturing accuracy, the manufacturing cost will inevitably increase. At the same time, the thread tooth thickness of the M8 micro-screw is only 0.25mm, which is thin, low in strength, and poor in wear resistance, which affects the life of the micro-screw. Summary of the invention

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

[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 produce displacement through the different pitch differences between the intermediate nut and the movable nut, and adopts ordinary thread standard pitch to achieve high-precision micro-movement, avoiding the increase in processing costs and jamming during use caused by the pitch 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 the present invention provides a differential thread fine-tuning mechanism for a coincidence level, the coincidence level comprising a housing and a lever device, the lever device being arranged in the housing, the differential thread fine-tuning mechanism comprising:

[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, which is sleeved on the micrometer screw, and the micrometer screw is connected to the intermediate nut via a first thread;

[0011] The movable nut is sleeved on the intermediate nut, the intermediate nut is connected to the movable nut via a second thread, and the movable nut is connected to the lever device.

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

[0013] A fine-motion knob is fixedly connected to the micrometer screw, and the fine-motion knob is located outside the shell.

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

[0015] A differential disk is arranged between the housing and the fine-motion knob, and the differential disk is sleeved on the micrometer screw. Scale lines are evenly arranged on the circumference of the differential disk, and the differential disk is fixedly connected to the housing.

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

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

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

[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] An embodiment of the second aspect of the present invention provides a coincidence level, the coincidence level comprising:

[0022] case;

[0023] A lever device, disposed in the housing; and

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

[0025] Optionally, the lever device comprises:

[0026] A lever, disposed in the housing;

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

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

[0029] The differential thread fine adjustment mechanism and the coincidence level provided by the embodiment of the present invention, wherein the differential thread fine adjustment mechanism includes a micrometer screw, an intermediate nut sleeved on the micrometer screw and a movable nut sleeved on the intermediate nut. When the micrometer screw is rotated, the micrometer screw drives the intermediate nut to rotate. Since the movable nut is fixedly connected to the lever device and cannot rotate with the intermediate nut, it moves along the axis of the micrometer screw. That is to say, the pitch difference between the intermediate nut and the movable nut is utilized to generate a small displacement through the pitch difference, and then the balance of the lever device is adjusted through the small displacement of the movable nut to achieve a small movement of the lever device. There is no need to process threads less than the minimum standard pitch, thereby reducing the processing difficulty and processing cost, thereby ensuring the tooth thickness requirements of the thread and increasing the service life of the micrometer screw; at the same time, the processing accuracy can be guaranteed, and the occurrence of jamming and jumping when the micrometer screw rotates can be avoided, thereby ensuring the reliability and stability of the coincidence level and improving the accuracy of the reading of the coincidence level.

[0030] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1a A schematic diagram of a combined image level in the prior art;

[0033] Figure 1b It is an internal schematic diagram of a combined image level in the prior art;

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

[0035] Figure 1d It is a schematic diagram of the level in a horizontal position;

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

[0037] Figure 3 Schematic diagram of a coincident level according to an embodiment of the present invention.

[0038] The corresponding relationship between the reference numerals and component names in FIG1 is as follows:

[0039] 1' observation window, 2' fine-motion knob, 3' fine-motion screw, 4' level, 5' housing, 6' lever system;

[0040] Figure 2 and Figure 3 The corresponding relationship between the reference numerals and the component names is as follows:

[0041] 1. Micro-motion knob, 2. Differential disk, 3. Housing, 4. Micrometer screw, 5. Intermediate nut, 6. Movable nut, 7. Lever device. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Before further describing the embodiments of the present invention in detail, the directional nouns involved in the embodiments of the present invention, such as "upper part", "lower part" and "side part", do not have the meaning of limiting the protection scope of the present invention.

[0044] To make the technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0045] Figure 2 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, an embodiment of the present invention provides a differential thread fine-tuning mechanism for a coincidence level, the coincidence level comprising a housing 3 and a lever device 7, the lever device 7 being disposed in the housing 3, and the differential thread fine-tuning mechanism comprising:

[0047] The micrometer screw 4 is movably connected to the housing 3, and at least a portion 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 through a first thread;

[0049] The movable nut 6 is sleeved on the intermediate nut 5 . The intermediate nut 5 and the movable nut 6 are connected via a second thread. The movable nut 6 is connected to the lever device 7 .

[0050] The differential thread fine adjustment mechanism includes a micrometer screw 4, an intermediate nut 5 sleeved on the micrometer screw 4, and a movable nut 6 sleeved on the intermediate nut 5. When the micrometer screw 4 is rotated, the micrometer screw 4 drives the intermediate nut 5 to rotate. Since the movable nut 6 is fixedly connected to the lever device 7 and cannot rotate with the intermediate nut 5, it moves along the axis of the micrometer screw 4. In other words, the pitch difference between the intermediate nut 5 and the movable nut 6 is utilized to generate a small displacement through the pitch difference, and then the balance of the lever device 7 is adjusted through the small displacement of the movable nut 6 to achieve a small movement of the lever device 7. There is no need to process a thread with a pitch smaller than the minimum standard pitch, thereby reducing the processing difficulty and processing cost, thereby ensuring the tooth thickness requirements of the thread, and improving the service life of the micrometer screw 4; at the same time, it can ensure the processing accuracy, avoid the occurrence of jamming and jumping when the micrometer screw 4 rotates, ensure the reliability and stability of the coincidence level, and improve the accuracy of the reading of the coincidence level.

[0051] Specifically, the present application uses a threaded transmission mechanism composed of two screw pairs, and utilizes the difference in pitch of the two screw pairs (intermediate nut 5 and movable nut 6) to generate a differential between the movable nut 6 and the micrometer screw 4, that is, to utilize the difference in pitch to generate a small displacement, thereby achieving high-precision micro-movement. The differential thread fine-tuning mechanism can be applied to precision adjustment mechanisms and micrometering mechanisms, such as in addition to the coincidence level, it can also be applied to the fixture fine-tuning mechanism, which will not be listed one by one.

[0052] It should be noted that the pitch of the intermediate nut 5 and the movable nut 6 in the present application can adopt the standard pitch of ordinary threads, which reduces the production difficulty, ensures the smoothness of movement on the thread, reduces the production difficulty, and at the same time avoids the thickness of the thread teeth being too thin, affecting 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 production economy and use accuracy.

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

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

[0055] Among them, due to the limitation of the installation space, the diameter of the micrometer screw 4 is usually small, so manually rotating the micrometer screw 4 directly will cause pain in the hand when rotating the micrometer screw 4, and will also affect the accuracy of rotation. Therefore, the micrometer screw 4 located outside the housing 3 is fixedly connected to the fine-motion knob 1, and the micrometer screw 4 is driven to rotate by rotating the fine-motion knob 1, thereby realizing the movement of the intermediate nut 5 and the movable nut 6. The diameter of the fine-motion knob 1 is located outside the housing 3, so it is not restricted, and can achieve easy rotation and rotation accuracy.

[0056] It is understandable that a bearing can be provided at the connection between the micrometer screw 4 and the housing 3 to realize the rotation support of the housing 3 on the micrometer screw 4. A bearing bush or a self-lubricating copper sleeve can also be provided between the micrometer screw 4 and the housing 3 to realize the rotation support, which will not be listed one by one.

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

[0058] The differential disk 2 is disposed between the housing 3 and the fine-motion knob 1 , and the differential disk 2 is sheathed on the micrometer screw 4 . Scale lines are evenly arranged on the circumference of the differential disk 2 , and the differential disk 2 is fixedly connected to the housing 3 .

[0059] Among them, a differential disk 2 is set between the micro knob 1 and the shell 3. In order to facilitate accurate reading after the micro knob 1 drives the micrometer screw 4 to rotate, scale lines are set on the differential disk 2, and the circular differential disk 2 is evenly divided into 100 equal parts. A pointer line is set on the micro knob 1, and the micro knob 1 is rotated until the two halves of the bubbles A and B are aligned. The position where the pointer line is aligned with the scale line of the differential disk 2 is found, and the number of grids on the differential disk 2 can be read, and then the lifting and lowering data of the lever device 7 can be obtained.

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

[0061] Among them, the micrometer screw 4 and the intermediate nut 5 are connected by a first thread, and a first external thread is set on the micrometer screw 4, and a first internal thread is set in the intermediate nut 5. The first internal thread matches the second external thread, 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 processing, and the minimum pitch of the fine thread in the existing standard can be used, thereby reducing the processing accuracy, thereby reducing production costs, improving economy, and avoiding sticking and jumping of the micrometer screw.

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

[0064] Similarly, the intermediate nut 5 is connected to the movable nut 6 through a second thread, and a second external thread is provided on the outer side of the intermediate nut 5, and a second internal thread is provided inside the movable nut 6, and the second internal thread matches the second external thread, that is, the pitch of the second thread is P2. The second thread does not need to be processed more accurately, and the pitch of the fine thread in the existing standard can be used, which reduces the processing accuracy, thereby reducing the production cost, improving the economy, and avoiding the stuck and jumping phenomenon of the micrometer screw when rotating.

[0065] The reading principle of the combined image level is as follows: taking a level with a specification of 200 and a range of 0-10mm as an example, the operator faces the level, the micro-knob 1 is located on the right hand side, the left end is the reference zero point, and 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 micro-knob 1 rotates 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 rise, and the leveler 4' is adjusted to a horizontal position. At this time, the micro-knob 1 pointer is located on the right side of the zero scale line of the differential disk 2, which is also the number of grids that the right end is higher than the left end, that is, 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, that is, P2>P1, to ensure that when the micro-knob 1 rotates 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 means that the intermediate nut 5 can move inside the movable nut 6, preventing the intermediate nut 5 from falling off from the movable nut 6 and affecting the normal use of the differential thread fine-tuning mechanism. The moving stroke of the movable nut 6 directly reflects the measuring range of the level 0-10mm. Taking the first thread pitch P1=0.75 and the second thread pitch P2=1.25 as an example, the intermediate nut 5 rotates at least 20 times to meet the moving distance of the movable nut 6 of 10mm. Considering the thickness and safety margin of the intermediate nut 5, the height of the intermediate nut 5 is at least 3 to 4 P1 (the pitch of the first thread), that is, 2.25mm to 3mm. The thickness of the movable nut 6 is at least 22 P2 (the pitch of the second thread), that is, 27.5mm.

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

[0068] Among them, when the first thread and the second thread are both right-hand fine-pitch ordinary threads, facing the fine-motion knob 1, when the fine-motion knob 1 rotates clockwise, the micrometer screw 4 rotates clockwise, driving the intermediate nut 5 to rotate and move upward at the same time. Since the movable nut 6 is fixedly connected to the lever device 7, it cannot rotate together with the intermediate nut 5 and can only move downward along the axis of the micrometer screw 4. Since the intermediate nut 5 and the movable nut 6 have the same rotation direction, and the movable nut 6 does not rotate but only moves, the distance L that the movable nut 6 moves downward is P2-P1. When the fine-motion knob 1 rotates counterclockwise, the micrometer screw 4 rotates counterclockwise, driving the intermediate nut 5 to rotate and move downward at the same time. Since the movable nut 6 is fixedly connected to the lever device 7, it cannot rotate together with the intermediate nut 5 and can only move upward along the axis of the micrometer screw 4. Since the intermediate nut 5 and the movable nut 6 have the same rotation direction, and the movable nut 6 does not rotate but only moves, the distance L that the movable nut 6 moves upward is P2-P1.

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

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

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

[0072] Among them, the model of the micrometer screw 4 can usually be selected as 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 a right-handed fine-pitch ordinary thread or a left-handed fine-pitch ordinary thread with a pitch corresponding to the diameter can be selected.

[0073] In a feasible implementation manner, 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 diameter of the second external thread is M12, M14 or M16, and a right-hand fine pitch ordinary thread or a left-hand fine pitch ordinary thread with a pitch corresponding to the diameter can be selected. As long as the first thread and the second thread have the same rotation direction.

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

[0076] It should be noted that since the movable nut 6 moves a distance of 0.5 mm when the fine-motion knob 1 rotates one circle, and the differential disk 2 is divided into 100 equal grids, when the fine-motion knob 1 rotates one grid, the movable nut 6 moves a distance of 0.5 / 100=0.005 mm, thereby ensuring the sensitivity of the differential thread fine-tuning mechanism without increasing the difficulty of manufacturing the thread of the micrometer screw 4.

[0077] For example, the first thread may be a right-hand (left-hand) fine-pitch ordinary thread with a diameter of M10 and a pitch of 1.0 mm, and the second thread may be a right-hand (left-hand) fine-pitch ordinary thread with a diameter of M16 and a pitch of 1.5 mm; or the first fine thread may be a right-hand (left-hand) fine-pitch ordinary thread with a diameter of M12 and a pitch of 1.0 mm, and the second thread may be a right-hand (left-hand) fine-pitch ordinary thread with a diameter of M16 and a pitch of 1.5 mm. As long as the pitch difference between the first thread and the second thread is 0.5 mm, the installation space requirement can be met.

[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 must be increased, which in turn increases the manufacturing difficulty of the lever device 7. Therefore, in this embodiment, the difference between the second pitch and the first pitch is selected to be 0.5 mm, which meets the measurement requirements while reducing production difficulty and improving economy.

[0079] Figure 3 Schematic diagram of a coincident level according to an embodiment of the present invention.

[0080] like Figure 3 As shown, another embodiment of the present invention provides a coincidence level, the coincidence level comprising:

[0081] Shell 3;

[0082] A lever device 7 is disposed in the housing 3; and

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

[0084] Among them, the coincident level uses a prism to compound and magnify the bubble image in the level to improve the accuracy of the reading, and uses a set of transmission mechanisms such as a lever device 7 and a differential thread fine-tuning mechanism to improve the sensitivity of the reading. In the coincident level, the level mainly plays the role of pointing to zero. The method of using the optical coincident level is to place the coincident level on the working surface to be inspected. Due to the inclination of the working surface to be inspected, the two bubbles do not overlap, and then the differential thread fine-tuning mechanism is rotated until the two bubbles overlap. At this time, the actual inclination of the inspected part can be read. The reading of the coincident level is not read directly from the level, but through the refraction of the two ends of the bubble through the prism and converged, and observed through the eyepiece. The reading is accurate and less affected by changes in ambient temperature; the coincident level adopts a simple and intuitive operating interface, which is easy to operate. At the same time, the appearance is compact, easy to carry and store, and suitable for use in the field, construction sites and other environments.

[0085] It should be noted that, since the coincidence level of this embodiment adopts the above-mentioned differential thread fine-adjustment mechanism, it has all the advantages of the above-mentioned differential thread fine-adjustment mechanism, which will not be described in detail.

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

[0087] In a feasible implementation manner, the lever device 7 comprises:

[0088] A lever, disposed in the housing 3;

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

[0090] Wherein, 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 reading of the coincident level. Specifically, the coincident level uses optical parts to compound and magnify the bubble image, and improves the sensitivity of the reading through the lever device 7. When the measured object is tilted, the lever device 7 can accurately reflect this slight change, making the reading more accurate.

[0092] Specifically, the lever device 7 is mainly composed of a lever and a lever bracket, and is used to transmit the tiny movement of the movable nut 6 in the differential thread. When the coincident level is tilted, the lever device 7 is driven to transmit this movement by adjusting the differential thread fine adjustment mechanism, so that the reading is more sensitive.

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

[0094] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The description and examples are to be considered exemplary only.

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

Claims

1. A differential thread fine adjustment mechanism for a coincidence level, the coincidence level comprising a housing and a lever device, the lever device being arranged in the housing, characterized in that: The differential thread fine-tuning mechanism comprises: A micrometer screw is movably connected to the housing, and at least a portion of the micrometer screw is located outside the housing; An intermediate nut, which is sleeved on the micrometer screw, and the micrometer screw is connected to the intermediate nut via a first thread; The movable nut is sleeved on the intermediate nut, the intermediate nut is connected to the movable nut via a second thread, and the movable nut is connected to the lever device.

2. The differential thread fine-tuning mechanism according to claim 1, characterized in that: The differential thread fine-tuning mechanism also includes: A fine-motion knob is fixedly connected to the micrometer screw, and the fine-motion knob is located outside the shell.

3. The differential thread fine-tuning mechanism according to claim 2, characterized in that: The differential thread fine-tuning mechanism also includes: A differential disk is arranged between the housing and the fine-motion knob, and the differential disk is sleeved on the micrometer screw. Scale lines are evenly arranged on the circumference of the differential disk, and the differential disk is fixedly connected to the housing.

4. The differential thread fine-tuning mechanism according to claim 1, characterized in that: The first thread includes a first external thread provided on the micrometer screw and a first internal thread provided in the intermediate nut, and the pitch of the first thread is P1.

5. The differential thread fine-tuning mechanism according to claim 4, characterized in that: The second thread includes a second external thread arranged outside the intermediate nut and a second internal thread arranged inside the movable nut. The pitch of the second thread is P2, and P2>P1.

6. The differential thread fine-tuning mechanism according to claim 5, characterized in that: When the micrometer screw rotates one circle, the movable nut moves a distance L=P2-P1, and the first thread and the second thread have the same rotation direction.

7. The differential thread fine-tuning mechanism according to claim 4, characterized in that: The micrometer screw is an M8, M10 or M12 screw.

8. The differential thread fine-tuning mechanism according to claim 5, characterized in that: The diameter of the second internal thread is M12, M14 or M16.

9. A combined image level, characterized in that: The combined image level instrument comprises: case; A lever device is disposed in the housing; and The differential thread fine-tuning mechanism according to any one of claims 1 to 8, fixedly connected to the lever device.

10. The coincidence level according to claim 9, characterized in that: The lever device comprises: A lever, disposed in the housing; A lever bracket, one end of which is fixedly connected to the housing, and the other end of which is movably connected to the lever; Wherein, the differential thread fine-tuning mechanism is fixedly connected to the lever.

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