Compact differential thread pair
By designing a compact differential thread pair and adopting components such as a limit anti-rotation pin and a scale anti-dropout sleeve, the problems of the existing differential thread pair being unable to fine-tune the reading and having a complex structure are solved, and the effects of fine-tuning the reading, preventing the knob from falling, and simplifying the structure are achieved.
Patent Information
- Application Number
- CN202511234079.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-29
- Publication Date
- 2025-10-17
AI Technical Summary
The existing differential thread pair cannot fine-tune the reading, the knob is easy to unscrew, the diameter is large, the structure is complex, the process is difficult, and it is prone to rotation failure and overtravel and thread disengagement.
A compact differential thread pair was designed, which uses components such as internal and external thread knobs, scale anti-slip sleeves, fine-adjustment knobs, and differential thread shafts. The rotation is restricted by the limit anti-rotation pin and scale anti-slip sleeve. Combined with the anti-rotation ribs and hollow design, fine-tuning of readings can be achieved and disengagement can be prevented.
The fine-tuning reading function is realized, the knob is prevented from falling, the diameter is small, the structure is simplified, the process difficulty is reduced, rotation failure and over-travel disengagement are prevented, and it is suitable for ergonomic design.
Smart Images
Figure CN120802453A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to an adjusting thread pair in the field of optics, and in particular to a compact differential thread pair with the features of fine adjustment, reading capability, anti-dropping knob and small diameter. Background Art
[0002] A differential thread pair is a special thread transmission mechanism that achieves micro-displacement or high-precision motion control by combining two threads with different pitches (usually internal and external threads). Its core principle is to use the pitch difference between the two threads (ΔP = P1-P2) to amplify or reduce the motion effect. It is often used in mechanical systems requiring high-precision adjustment. Existing differential thread pairs cannot read fine adjustments, have large diameters, and the fine adjustment knobs are easily unscrewed. The knob fixing screws do not restrict axial rotation. Moreover, the structure is complex and the process is difficult. Rotational failure and overtravel of the differential thread shaft, resulting in thread disengagement, are common problems. Therefore, it is necessary to design a compact differential thread pair to solve these problems. Summary of the Invention
[0003] Purpose of the invention: The purpose of the present invention is to provide a compact differential thread pair with fine adjustment, readable readings, anti-drop knob and smaller diameter.
[0004] Technical solution: The compact differential thread pair described in the present invention includes an external thread push rod, an internal and external thread knob, a scale anti-slip sleeve, a fine adjustment knob, a differential thread shaft, a knob tightening screw, a limit anti-rotation pin, a coarse adjustment locking nut, a mounting screw sleeve and a set screw; the outer side of the external thread push rod is covered with an internal and external thread knob, and a mounting screw sleeve is provided on the outer side of the internal and external thread knob. A coarse adjustment locking nut is provided on the right side of the mounting screw sleeve. The right side of the coarse adjustment locking nut is provided with a fine adjustment knob and a differential thread shaft from outside to inside. The internal and external thread knobs are rotated for coarse adjustment. After the coarse adjustment is in place, the coarse adjustment locking nut is used to lock the internal and external thread knobs. The internal and external thread knobs no longer rotate. The fine adjustment knob is rotated to drive the differential thread shaft forward and the external thread push rod backward to generate a thread difference, which is read through the scale anti-slip sleeve and the scale on the fine adjustment knob. An anti-rotation rib is provided inside the fine adjustment knob.
[0005] Furthermore, mutually matching threads are provided between the internal and external threaded knob and the mounting screw sleeve.
[0006] Furthermore, the coarse adjustment locking nut is tightened to press the mounting screw sleeve after the coarse adjustment is in place.
[0007] Furthermore, an anti-rotation rib is provided inside the fine-adjustment knob, and the anti-rotation rib is inserted into the groove of the differential threaded shaft and cooperates with the fine-adjustment knob.
[0008] Furthermore, the knob tightening screw is inserted into the fine adjustment knob from the rear side to tighten it.
[0009] Further, the differential screw shaft is hollow designed for the metal chips of internal thread processing to flow out, and the internal and external threads are arranged on the shaft body to realize the forward movement of the differential screw shaft, and the external thread ejector rod moves backward.
[0010] Further, the limit anti-rotation pin is arranged between the coarse adjustment locking nut and the scale anti-extraction sleeve to limit the movement range and rotation of the external thread ejector rod.
[0011] Further, the scale anti-extraction sleeve is arranged between the fine adjustment knob and the differential screw shaft to limit the differential screw shaft from being extracted from the thread.
[0012] Further, the scale anti-extraction sleeve is fixed by the set screw which is inserted into the recess of the underlying part.
[0013] Further, the scale anti-extraction sleeve is partially located below the fine adjustment knob and partially located outside and provided with a scale.
[0014] Beneficial effects: Compared with the prior art, the present application has the following remarkable advantages: the present application can not only be fine adjusted but also read, and has a smaller diameter, the limit anti-rotation pin is placed in the middle of one side to simplify the structure and reduce the process difficulty; the anti-rotation rib of the fine adjustment knob cooperates with the groove of the differential screw shaft to prevent the rotation failure of the screw after being pressed; the scale anti-extraction sleeve can not only provide scale reading for fine adjustment but also prevent the differential screw shaft from being extracted from the thread due to overstroke; the internal and external thread knobs are widened designed to be suitable for the ergonomic design and the length of the hand bow to meet the fine adjustment reading requirements of coarse adjustment and a larger range; the hollow design of the differential screw shaft facilitates the flow of the metal chips of internal thread processing to improve the thread quality. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is a system section view of the present application;
[0016] Figure 2 It is a top view of the present application;
[0017] Figure 3 It is a system structure schematic view of the present application;
[0018] Figure 4 It is a schematic view of the internal anti-rotation rib of the fine adjustment knob of the present application;
[0019] Figure 5 It is a simulation view of the present application;
[0020] Figure 6 It is a simulation section view of the present application. DETAILED DESCRIPTION
[0021] The technical solutions of the present application will be further described below in combination with the drawings.
[0022] AsFigure 1 、 3 The present application comprises a coarse adjustment structure and a fine adjustment structure, the coarse adjustment structure comprises an outer thread top rod 1, an inner and outer thread knob 2, a limit anti-rotation pin 7, a coarse adjustment locking nut 8, a mounting sleeve 9 and a fastening screw 10; the fine adjustment structure comprises a scale anti-dropping sleeve 3, a fine adjustment knob 4, a differential thread shaft 5 and a knob compression screw 6; the outer thread top rod 1 is sleeved with the inner and outer thread knob 2 on the outside, the inner and outer thread knob 2 is provided with the mounting sleeve 9 on the outside, the right side of the mounting sleeve 9 is provided with the coarse adjustment locking nut 8, and the right side of the coarse adjustment locking nut 8 is sequentially provided with the fine adjustment knob 4 and the differential thread shaft 5 from outside to inside.
[0023] The mounting sleeve 9 is sleeved on the outside of the outer thread knob 2, and the inner and outer thread knob 2 and the mounting sleeve 9 are provided with threads matched with each other; after the mounting sleeve 9 is mounted, coarse adjustment is first performed, the inner and outer thread knob 2 is rotated for coarse adjustment, the coarse adjustment is locked by the coarse adjustment locking nut 8 after being adjusted in place, the inner and outer thread knob 2 is no longer rotated, fine adjustment is then performed, the fine adjustment knob 4 is rotated to drive the differential thread shaft 5 to move forward, the outer thread top rod 1 moves backward, a thread difference is generated, and the scale on the scale anti-dropping sleeve 3 and the fine adjustment knob 4 is read out.
[0024] The coarse adjustment locking nut 8 is tightened to press the mounting sleeve 9 after coarse adjustment is adjusted in place, the fine adjustment knob 4 is provided with an anti-rotation rib inside, the anti-rotation rib is inserted into the groove of the differential thread shaft 5 and matched with the fine adjustment knob 4, so that the fine adjustment knob 4 can be rotated to drive the differential thread shaft 5 to rotate together, and the anti-rotation rib inserted into the groove of the differential thread shaft 5 can prevent rotation failure of the screw after the knob compression screw 6 is compressed, the anti-rotation rib is arranged on the fine adjustment knob 4, is matched with the groove of the differential thread shaft 5, and prevents rotation failure of the screw after the screw is compressed, as shown in the figure. Figure 4 The knob compression screw 6 is inserted into the fine adjustment knob 4 from the back side to compress.
[0025] The differential thread shaft 5 is provided with inner and outer threads for realizing that the differential thread shaft 5 moves forward and the outer thread top rod 1 moves backward, the fine adjustment knob 4 is rotated to drive the differential thread shaft 5 to move forward, the differential thread shaft 5 is provided with inner and outer threads, the outer thread top rod 1 is inside the differential thread shaft 5, the outer thread top rod 1 is provided with threads matched with the inner threads of the differential thread shaft 5, the differential thread shaft 5 moves forward, the outer thread top rod 1 moves backward, and a displacement difference, that is, a thread difference, is formed.
[0026] The limit anti-rotation pin 7 is arranged in the middle of one side between the coarse adjustment locking nut 8 and the scale anti-dropping sleeve 3 for limiting the movement range and rotation of the outer thread top rod 1, is arranged in the middle of one side, simplifies the structure and reduces the process difficulty.
[0027] The inner and outer thread knob 2 is designed to be wider than the existing product.
[0028] The scale anti-loosing sleeve 3 is arranged between the fine adjustment knob 4 and the differential screw shaft 5, and limits the differential screw shaft 5 from being loosened. Figure 2 As shown in the drawings, the scale anti-loosing sleeve 3 is fixed by the set screw 10, which is inserted into the recess of the lower part to prevent rotation and loosening. The scale anti-loosing sleeve 3 is partially located below the fine adjustment knob 4 and partially located outside and provided with a scale. The scale anti-loosing sleeve 3 not only provides scale reading for fine adjustment, but also prevents the differential screw shaft 5 from being loosened due to overstroke.
[0029] As shown in the drawings, Figure 5 , 6 The working principle of the present application is as follows: after the mounting screw sleeve is installed, the inner and outer threaded knobs can be rotated for single thread rotation for coarse adjustment. After coarse adjustment, the coarse adjustment locking nut is tightened to press the mounting screw sleeve. At this time, the outer threaded knob cannot be rotated, and the fine adjustment knob is twisted to drive the differential screw shaft to rotate and adjust the displacement, which can also be read. The anti-rotation pin limits the movement range and rotation of the outer threaded top rod, and the scale anti-loosing sleeve limits the differential screw shaft from being loosened due to excessive tightening.
[0030] The present application adopts the anti-rotation pin which is placed in the middle of one side, which simplifies the structure and reduces the process difficulty. The anti-rotation rib of the fine adjustment knob cooperates with the groove of the differential screw shaft to prevent the rotation failure of the screw after being pressed. The scale anti-loosing sleeve not only provides scale reading for fine adjustment, but also prevents the differential screw shaft from being loosened due to overstroke. The inner and outer threaded knobs are widened, which is suitable for ergonomic design and the length of hand bow, and meets the requirements of coarse adjustment and fine adjustment reading in a large range.
Claims
1. A compact differential thread pair, characterized in that: The utility model comprises an external thread push rod (1), an internal and external thread knob (2), a scale anti-dropping sleeve (3), a fine adjustment knob (4), a differential thread shaft (5), a knob pressing screw (6), a limit anti-rotation pin (7), a coarse adjustment locking nut (8), a mounting screw sleeve (9) and a set screw (10); the external thread push rod (1) is sleeved with an internal and external thread knob (2), the external thread push rod (2) is provided with a mounting screw sleeve (9), the right side of the mounting screw sleeve (9) is provided with a coarse adjustment locking nut (8), the coarse adjustment locking nut (9) is provided with a coarse adjustment locking nut (8), and the coarse adjustment locking nut (10) is provided with a coarse adjustment locking nut (10). The right side of the nut (8) is provided with a fine adjustment knob (4) and a differential thread shaft (5) from outside to inside. The internal and external thread knobs (2) are rotated for coarse adjustment. After the coarse adjustment is in place, the coarse adjustment locking nut (8) is used to lock the internal and external thread knobs (2). The internal and external thread knobs (2) no longer rotate. The fine adjustment knob (4) is rotated to drive the differential thread shaft (5) to move forward and the external thread push rod (1) to move backward, thereby generating a thread difference, which is read through the scale anti-dropout sleeve (3) and the scale on the fine adjustment knob (4). The fine adjustment knob (4) is provided with an anti-rotation rib inside.
2. The compact differential thread pair according to claim 1, characterized in that: Mutually matching threads are provided between the internal and external threaded knob (2) and the mounting screw sleeve (9).
3. The compact differential thread pair according to claim 1, characterized in that: The coarse adjustment locking nut (8) is tightened to press the mounting screw sleeve (9) after the coarse adjustment is in place.
4. The compact differential thread pair according to claim 1, characterized in that: An anti-rotation rib is provided inside the fine adjustment knob (4), and the anti-rotation rib is inserted into the groove of the differential threaded shaft (5) to prevent relative rotation.
5. The compact differential thread pair according to claim 1, characterized in that: The knob tightening screw (6) is inserted into the fine adjustment knob (4) from the rear side to tighten it.
6. The compact differential thread pair according to claim 1, characterized in that: The differential threaded shaft (5) is hollow in design and is used for the discharge of metal chips during internal thread processing. Internal and external threads are provided on the shaft body to enable the differential threaded shaft (5) to move forward and the external threaded push rod (1) to move backward.
7. The compact differential thread pair according to claim 1, characterized in that: A single-sided position-limiting anti-rotation pin (7) is provided in the middle of the internal and external threaded knob (2) for limiting the axial movement range and rotation of the external threaded push rod (1).
8. The compact differential thread pair according to claim 1, characterized in that: A scale anti-slip sleeve (3) is provided between the fine adjustment knob (4) and the differential threaded shaft (5) to restrict the differential threaded shaft (5) and prevent it from slipping out of the thread.
9. The compact differential thread pair according to claim 1, characterized in that: The scale anti-dropout sleeve (3) is fixed by a set screw (10), and the set screw (10) is pushed into the pit of the internal and external threaded knob (2) to prevent the scale anti-dropout sleeve (3) from rotating and moving.
10. The compact differential thread pair according to claim 1, characterized in that: The scale anti-drop sleeve (3) is partially located below the fine adjustment knob (4) and partially outside and is provided with scales.