A telescopic drive mechanism for a single molecule measuring instrument

Abstract

The utility model relates to single molecule measuring instrument technical field, especially in a kind of telescopic drive mechanism for single molecule measuring instrument, including: sleeve assembly, including fixed end cap, sleeve main body and protective shell, transmission cavity is equipped in sleeve main body, sleeve main body includes fixed part and extension, fixed part is connected with fixed end cap, extension is vertically extended by fixed part, and extension is provided with guide sliding slot;Protective shell is set in the side of fixed part away from fixed end cap and is set in the outside of extension and guide part;Drive assembly is connected with the side of fixed end cap away from sleeve main body;Transmission assembly is transmission connection with the output end of drive assembly and is located in transmission cavity, including transmission part and guide piece, guide piece is set apart in the outside of transmission part and extends into guide sliding slot, each guide piece is all with the side wall of guide sliding slot length direction abutment. The utility model structure is simple and reliable, can ensure the normal operation of measuring instrument without affecting the occupied space.

Description

Technical Field

[0001] This utility model relates to the field of single-molecule measuring instrument technology, and in particular to a telescopic drive mechanism for a single-molecule measuring instrument. Background Technology

[0002] Single-molecule measurement instruments require a telescopic drive structure to reciprocate the extension and retraction of the probe, thereby allowing the probe to contact or move away from the sample to complete the detection. Due to the small internal space of single-molecule measurement instruments and the extremely high requirements for measurement accuracy, the telescopic drive structure used needs to be highly integrated to enable precise control of the probe within a limited space.

[0003] Conventional telescopic drive structures primarily use a drive motor to rotate a lead screw. The lead screw, through its threads, causes a push rod to move up and down along the sleeve of the drive structure, thereby driving the probe to reciprocate. However, because the lead screw needs to rotate during the lifting and lowering process, the torque of the lead screw rotation is transmitted to the push rod. Over time, this can cause the push rod to twist or shift, leading to abnormal alignment between the push rod and the sleeve, or the sleeve tilting to one side, causing the entire structure to jam. This prevents the entire drive structure from functioning properly, affecting the operation and maintenance efficiency of the single-molecule measuring instrument.

[0004] Therefore, it is necessary to study a driving structure that can avoid the torsional effects during conduction within a limited space, while ensuring the normal operation of the single-molecule measuring instrument in a simple and reliable manner. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a telescopic drive mechanism for a single-molecule measuring instrument, which solves the problem that the existing telescopic drive mechanism cannot adapt to limited space and will cause phenomena such as torsion jamming under long-term use.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a telescopic drive mechanism for a single-molecule measuring instrument, comprising: A sleeve assembly includes a fixed end cap, a sleeve body, and a protective shell. The sleeve body has a transmission cavity and includes a fixed part and an extension part. One side of the fixed part is connected to the fixed end cap, and the center of the fixed part has a transmission through hole. The extension part extends vertically around the transmission through hole from the side of the fixed part away from the fixed end cap, and a guide groove is formed on the side of the extension part away from the fixed part. The protective shell is disposed on the side of the fixed part away from the fixed end cap and is sleeved on the outside of the extension part and the guide part. The drive assembly is connected to the side of the fixed end cap away from the sleeve body, and the drive end of the drive assembly extends into the transmission cavity from the center of the drive assembly. The transmission assembly is connected to the output end of the drive assembly and is located in the transmission cavity. It includes a transmission component and a guide component. The guide components are spaced apart on the outside of the transmission component and extend into the guide groove. Each guide component abuts against one side wall of the guide groove along its length.

[0007] In one embodiment, the transmission component includes a lead screw and a push rod. The push rod includes a fixed base and a top rod. The fixed base is connected to the nut pair of the lead screw. The top rod is located on the side of the fixed base away from the nut pair. Guide members are spaced apart on the outer edge of the fixed base.

[0008] In one embodiment, the guide includes a fixed connecting rod and a guide wheel. The two ends of the fixed connecting rod are respectively connected to the center of the fixed base and the center of the guide wheel, and the wall of the guide wheel abuts against one side wall of the guide groove.

[0009] In one embodiment, a rolling bearing is provided in the middle of the guide wheel, and the fixed connecting rod is connected to the guide wheel through the rolling bearing.

[0010] In one embodiment, at least two guide grooves are provided, and the number of guide members is at least twice that of the guide grooves.

[0011] In one embodiment, the guide groove extends from the middle of the extension to the end of the extension, and a spaced guide portion is formed at the end of the extension away from the fixing portion, and the guide member abuts against the side wall of the guide portion.

[0012] In one embodiment, the push rod has a receiving cavity for accommodating the lead screw that extends beyond the nut assembly.

[0013] In one embodiment, the transmission assembly further includes a coupling disposed between the output end of the drive assembly and the lead screw. The bottom of the coupling is located above the fixed end cover, and the extension is provided with an installation opening corresponding to the coupling, which is located below the guide groove.

[0014] In one embodiment, the mounting opening is connected to the guide groove, and in the direction of the vertical fixing part, the projected area of ​​the mounting opening is smaller than the projected area of ​​the guide groove.

[0015] In one embodiment, the outer diameter of the fixed base and coupling is smaller than the inner diameter of the extension.

[0016] The beneficial effects of this utility model are as follows: Conventional telescopic drive structures primarily utilize a drive motor to rotate a lead screw. The lead screw, through its threads, causes a push rod to move up and down along the sleeve of the drive structure, thus reciprocating the probe's extension and retraction. During operation, especially during start-up and shutdown, the torque of the lead screw rotation is transmitted to the push rod. Over time, this can cause the push rod to twist or shift, leading to misalignment between the push rod and the sleeve, or the sleeve tilting to one side, causing the entire structure to jam. Adding structures such as rings to enhance the push rod's stability would increase the internal complexity of the telescopic drive structure, making it larger and less suitable for the limited installation space of a single-molecule measuring instrument.

[0017] Therefore, this utility model adopts a sleeve body with an extension and a guide groove is opened on the sleeve body so that the guide member of the transmission component extends into the guide groove and abuts against one side wall of the guide groove. The joint abutment of multiple guide members makes the transmission component clamp the extension as a whole. Thus, when the transmission component moves in the transmission cavity, the torsional force is transmitted to the sleeve body through the guide member, which restricts the lateral torsion of the transmission component and avoids the transmission component from tilting or jamming after torsion.

[0018] Compared to adding an auxiliary guide structure within the sleeve body, creating a guide groove maintains the overall dimensions of the sleeve body without altering its shape. The position of the transmission component is no longer restricted by the transmission cavity. Furthermore, the guide member, after contacting the guide groove, supports the transmission component, preventing direct contact between the transmission component and the inner wall of the sleeve body. This ensures stability while reducing the contact area, thereby decreasing friction between the sleeve body and the transmission component and extending the overall service life of the structure. Moreover, the guide groove not only reduces the weight of the sleeve body but also allows technicians to observe and install the internal transmission components during assembly or disassembly, facilitating installation and maintenance. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a perspective view of an embodiment of the present utility model; Figure 2 for Figure 1 The main view; Figure 3 for Figure 2 Cross-sectional view at point AA; Figure 4 for Figure 1 Top view Figure 5 for Figure 4 Cross-sectional view at point BB; Figure 6 for Figure 5 A magnified view of a section at point C; Figure 7 This is an exploded view of an embodiment of the present invention; Figure 8 for Figure 7 A magnified view of a section at point D; Figure 9 This is an exploded view of the transmission component in one embodiment of the present invention.

[0021] Label Explanation: 1. Sleeve assembly; 11. Fixed end cap; 12. Sleeve body; 121. Fixing part; 1211. Transmission through hole; 122. Extension part; 1221. Mounting opening; 123. Guide groove; 124. Guide part; 13. Protective housing; 2. Drive assembly; 3. Transmission assembly; 31. Transmission component; 311. Lead screw; 3111. Nut pair; 312. Push rod; 3121. Fixed base; 3122. Top rod; 3123. Accommodating cavity; 32. Guide component; 321. Fixed connecting rod; 322. Guide wheel; 323. Rolling bearing; 33. Coupling. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. 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" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] Please refer to Figures 1 to 9A telescopic drive mechanism for a single-molecule measuring instrument, comprising: The sleeve assembly 1 includes a fixed end cap 11, a sleeve body 12, and a protective shell 13. The sleeve body 12 has a transmission cavity and includes a fixed part 121 and an extension part 122. One side of the fixed part 121 is connected to the fixed end cap 11, and the center of the fixed part 121 has a transmission through hole 1211. The extension part 122 extends vertically around the transmission through hole 1211 from the side of the fixed part 121 away from the fixed end cap 11. A guide groove 123 is provided on the side of the extension part 122 away from the fixed part 121. The protective shell 13 is disposed on the side of the fixed part 121 away from the fixed end cap 11 and is sleeved on the outside of the extension part 122 and the guide part 124. The drive assembly 2 is connected to the side of the fixed end cover 11 away from the sleeve body 12, and the drive end of the drive assembly 2 extends into the transmission cavity from the center of the drive assembly 2. The transmission assembly 3 is connected to the output end of the drive assembly 2 and is located in the transmission cavity. It includes a transmission component 31 and a guide component 32. The guide components 32 are spaced apart on the outside of the transmission component 31 and extend into the guide groove 123. Each guide component 32 abuts against one side wall of the guide groove 123 in the length direction.

[0025] Specifically, the drive component 2 can be a servo motor or a stepper motor. Those skilled in the art can choose according to actual needs without making specific limitations.

[0026] Specifically, the protective housing 13 has a shaft hole at its center on the side away from the fixing part 121, and the output end of the transmission member 31 extends out of the sleeve assembly 1 through the shaft hole. Specifically, the central axis of the transmission member 31 coincides with the central axis of the sleeve assembly 1.

[0027] In this embodiment, the transmission component 31 includes a lead screw 311 and a push rod 312. The push rod 312 includes a fixed base 3121 and a push rod 3122. The fixed base 3121 is connected to the nut assembly 3111 of the lead screw 311. The push rod 3122 is located on the side of the fixed base 3121 away from the nut assembly 3111. Guide components 32 are spaced apart along the outer edge of the fixed base 3121. Specifically, the fixed base 3121 has an overall cylindrical structure, and the nut assembly 3111 is embedded inside the fixed base 3121 and connected to the bottom of the fixed base 3121.

[0028] To reduce the friction between the guide member 32 and the sleeve body 12, thereby reducing the wear of the guide member 32, in this embodiment, the guide member 32 includes a fixed connecting rod 321 and a guide wheel 322. The two ends of the fixed connecting rod 321 are respectively connected to the center of the fixed base 3121 and the center of the guide wheel 322. The wall surface of the guide wheel 322 abuts against one side wall of the guide groove 123. This arrangement transforms surface contact into line contact. Preferably, the fixed connecting rod 321 and the fixed base 3121 are fixed by screw connection. This arrangement allows technicians to adjust the overall length of the guide 32 as needed, and to replace the guide 32 individually when it is worn and needs to be replaced, thus reducing maintenance costs.

[0029] The guide wheel 322 abuts against the side wall of the guide groove 123, which can reduce friction to a certain extent. However, after long-term use, the guide wheel 322 may experience localized wear. Therefore, a rolling bearing 323 is provided in the middle of the guide wheel 322, and the fixed connecting rod 321 is connected to the guide wheel 322 through the rolling bearing 323. This arrangement allows the guide wheel 322 to rotate when it moves along the side wall of the guide groove 123, further reducing friction and effectively improving the overall service life.

[0030] Preferably, the sidewall of the guide groove 123 is inclined from the outside to the inside of the extension 122, forming an flared structure from the inside to the outside. The guide wheel 322 is correspondingly set as a conical wheel body with a smaller inner diameter and a larger outer diameter. This arrangement enables the guide wheel 322 to provide tension to the fixed base 3121 from all sides, further preventing the fixed base 3121 from tilting to one side under mechanical vibration, and ensuring the overall stability of the structure.

[0031] In this embodiment, at least two guide grooves 123 are provided, and the number of guide members 32 is at least twice that of the guide grooves 123. Specifically, depending on the length of the fixed base 3121, one or more guide members 32 can be provided on the side wall of each fixed base 3121 to ensure the stability of the fixed base 3121. Those skilled in the art can select according to the actual situation, without making specific limitations.

[0032] In this embodiment, the guide groove 123 extends from the middle of the extension 122 to the end of the extension 122, and a spaced guide portion 124 is formed at the end of the extension 122 away from the fixing portion 121, and the guide member 32 abuts against the side wall of the guide portion 124.

[0033] Preferably, two guide grooves 123 are provided, which divide the extension 122 into two guide portions 124. Four guide members 32 are provided around the fixed base 3121, and the guide members 32 and the fixed base 3121 are in a cross shape. Each guide portion 124 is clamped between two guide members 32.

[0034] In this embodiment, the push rod 3122 has a receiving cavity 3123 inside, which is used to accommodate the lead screw 311 that extends beyond the nut pair 3111. By using the receiving cavity 3123, the volume of the telescopic drive mechanism for the single-molecule measuring instrument can be reduced, and the overall integration of the device can be further improved while ensuring telescopic accuracy.

[0035] In this embodiment, the transmission assembly 3 further includes a coupling 33, which is disposed between the output end of the drive assembly 2 and the lead screw 311. The bottom of the coupling 33 is located above the fixed end cover 11, and the extension 122 has an installation opening 1221 corresponding to the coupling 33, which is located below the guide groove 123. The coupling 33 allows the drive assembly 2 to use motors of different specifications, improving the adaptability of the device. To facilitate the installation of the coupling 33, the installation opening 1221 is provided on the extension 122, thereby preventing bolts and other structures on the coupling 33 from contacting the extension 122, preventing interference during operation, and effectively improving the stability of the device.

[0036] In this embodiment, the mounting opening 1221 communicates with the guide groove 123. In the direction perpendicular to the fixing part 121, the projected area of ​​the mounting opening 1221 is smaller than the projected area of ​​the guide groove 123. That is, the mounting opening 1221 is generally smaller than the guide groove 123, further dividing the extension 122 and forming an arc-shaped structure that is larger at the bottom and smaller at the top. This design not only reduces the weight of the sleeve body 12 and lowers the cost, but also forms a limiting structure at the junction of the guide groove 123 and the guide groove 123, ensuring the stability of the overall structure.

[0037] In this embodiment, the outer diameter of the fixed base 3121 and the coupling 33 is smaller than the inner diameter of the extension 122.

[0038] Although this document uses terms such as sleeve assembly, fixed end cap, and sleeve body frequently, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A telescopic drive mechanism for a single-molecule measuring instrument, characterized in that, include: The sleeve assembly (1) includes a fixed end cap (11), a sleeve body (12) and a protective shell (13). The sleeve body (12) has a transmission cavity. The sleeve body (12) includes a fixed part (121) and an extension part (122). One side of the fixed part (121) is connected to the fixed end cap (11). The center of the fixed part (121) has a transmission through hole (1211). The extension part (122) extends vertically around the transmission through hole (1211) from the side of the fixed part (121) away from the fixed end cap (11). The side of the extension part (122) away from the fixed part (121) has a guide groove (123). The drive assembly (2) is connected to the side of the fixed end cap (11) away from the sleeve body (12), and the drive end of the drive assembly (2) extends into the transmission cavity from the center of the drive assembly (2); The transmission assembly (3) is connected to the output end of the drive assembly (2) and is located in the transmission cavity. It includes a transmission component (31) and a guide component (32). The guide components (32) are spaced apart on the outside of the transmission component (31) and extend into the guide groove (123). Each guide component (32) abuts against one side wall of the guide groove (123) in the length direction. The guide groove (123) extends from the middle of the extension (122) to the end of the extension (122), and a spaced guide portion (124) is formed at one end of the extension (122) away from the fixing portion (121). The guide member (32) abuts against the side wall of the guide portion (124). The protective housing (13) is disposed on the side of the fixing portion (121) away from the fixing end cap (11) and is sleeved on the outside of the extension (122) and the guide portion (124).

2. The telescopic drive mechanism for a single-molecule measuring instrument according to claim 1, characterized in that: The transmission component (31) includes a lead screw (311) and a push rod (312). The push rod (312) includes a fixed base (3121) and a push rod (3122). The fixed base (3121) is connected to the nut pair (3111) of the lead screw (311). The push rod (3122) is located on the side of the fixed base (3121) away from the nut pair (3111). The guide component (32) is spaced apart on the outer edge of the fixed base (3121).

3. The telescopic drive mechanism for a single-molecule measuring instrument according to claim 2, characterized in that: The guide member (32) includes a fixed connecting rod (321) and a guide wheel (322). The two ends of the fixed connecting rod (321) are respectively connected to the center of the fixed base (3121) and the center of the guide wheel (322). The wall of the guide wheel (322) abuts against one side wall of the guide groove (123).

4. The telescopic drive mechanism for a single-molecule measuring instrument according to claim 3, characterized in that: The guide wheel (322) is provided with a rolling bearing (323) in the middle, and the fixed connecting rod (321) is connected to the guide wheel (322) through the rolling bearing (323).

5. The telescopic drive mechanism for a single-molecule measuring instrument according to claim 3, characterized in that: At least two guide grooves (123) are provided, and the number of guide members (32) is at least twice that of the guide grooves (123).

6. The telescopic drive mechanism for a single-molecule measuring instrument according to claim 2, characterized in that: The push rod (3122) has an internal cavity (3123) for accommodating the lead screw (311) that extends beyond the nut assembly (3111).

7. The telescopic drive mechanism for a single-molecule measuring instrument according to claim 2, characterized in that: The transmission assembly (3) also includes a coupling (33), which is disposed between the output end of the drive assembly (2) and the lead screw (311). The bottom of the coupling (33) is located above the fixed end cover (11). The extension (122) is provided with an installation opening (1221) corresponding to the coupling (33), which is located below the guide groove (123).

8. The telescopic drive mechanism for a single-molecule measuring instrument according to claim 7, characterized in that: The mounting opening (1221) is connected to the guide groove (123). In the direction perpendicular to the fixing part (121), the projected area of ​​the mounting opening (1221) is smaller than the projected area of ​​the guide groove (123).

9. The telescopic drive mechanism for a single-molecule measuring instrument according to claim 7, characterized in that: The outer diameter of the fixed base (3121) and the coupling (33) is smaller than the inner diameter of the extension (122).

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