Screw rod and clamping mechanism with same

Abstract

The utility model provides a lead screw and a clamping mechanism with the same. The lead screw is used for driving the multiple clamping parts to move and comprises a lead screw body, the plurality of spiral sections are arranged along the central axis of the screw rod body at intervals, the plurality of spiral sections and the plurality of clamping parts are arranged in a one-to-one correspondence manner, and each spiral section is matched with the corresponding clamping part so as to drive the clamping part to move along the central axis of the screw rod body; wherein each spiral section is an equal-screw-pitch spiral section, and the screw pitches of at least two spiral sections are different. According to the air cylinder, the problem that in the prior art, the machining cost is increased due to the fact that an air cylinder for achieving the clamping jaw pitch changing function is complex in structure is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of screw rod, specifically, a kind of screw rod and clamping mechanism with it. BACKGROUND

[0002] Currently, after clamping jaw clamps workpiece, often encounter the problem that the interval distance between workpieces needs to be adjusted according to process requirements, for example: there are many occasions to adjust the interval between batteries in the production process of lithium ion single battery.

[0003] In the prior art, the function of clamping jaw variable pitch is usually realized by using cylinder drive, however, the structure of the cylinder for realizing the above function is relatively complex, which not only increases the disassembly and assembly difficulty, but also increases the control difficulty of workers, affecting production efficiency. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a kind of screw rod and clamping mechanism with it, to solve the problem of complex structure of cylinder for realizing the function of clamping jaw variable pitch in prior art and increase processing cost.

[0005] In order to achieve the above purpose, according to one aspect of the utility model, a kind of screw rod is provided, for driving multiple clamping parts to move, the screw rod includes: screw rod body;Multiple spiral segments are arranged along the central axis of screw rod body, multiple spiral segments are arranged one by one with multiple clamping parts, each spiral segment cooperates with its corresponding clamping part to drive the clamping part to move along the central axis of screw rod body;Wherein, each spiral segment is equal pitch spiral segment, and the pitch of at least two spiral segments is different.

[0006] Further, the spiral angle of each spiral segment is greater than 0° and less than 360°.

[0007] Further, the connecting line L1 of the starting position of adjacent two spiral segments is arranged parallel to the central axis of screw rod body;And / or, the connecting line L2 of the terminal position of adjacent two spiral segments is arranged parallel to the central axis of screw rod body.

[0008] Further, multiple spiral segments include two spiral segment groups, two spiral segment groups are symmetrical about the central surface CS of screw rod body, each spiral segment group includes multiple spiral segments arranged along the direction from the middle part to the end of screw rod body, the pitch P of any two spiral segments symmetrical about the central surface CS in two spiral segment groups is consistent, and satisfies: θ / 360 P=S2 / 2-S1 / 2;Wherein, θ is the spiral angle of each spiral segment, the distance S1 is the distance between the starting position of the two spiral segments, and S2 is the distance between the terminal position of the two spiral segments.

[0009] Further, the pitch of the at least two helical segments gradually increases in a direction from the middle part to the end part of the screw rod body; and / or, the pitch difference of each two adjacent helical segments is consistent.

[0010] Further, the plurality of helical segments comprises two helical segment groups, the two helical segment groups are symmetrically arranged about the center surface CS of the screw rod body, each helical segment group comprises a first helical segment, a second helical segment and a third helical segment arranged in sequence in a direction from the middle part to the end part of the screw rod body, the first helical segment has a preset distance between the starting position and the center surface CS, the pitch of the second helical segment is greater than that of the first helical segment and the pitch difference is ΔP1, the pitch of the third helical segment is greater than that of the second helical segment and the pitch difference is ΔP2, and it satisfies: ΔP1=ΔP2.

[0011] Further, the helical segment is a helical groove, and the helical convex part arranged on the clamping part extends into the helical groove and is limitedly matched with the helical groove; or the helical segment is a helical convex part, and the helical convex part extends into the helical groove arranged on the clamping part to be limitedly matched with the helical groove.

[0012] Further, the helical segment is a helical groove, and the helical groove is at least one of a V-shaped groove, a U-shaped groove, a semicircular groove and a polygonal groove.

[0013] According to another aspect of the utility model, a clamping mechanism is provided, which comprises a driving device, a screw rod and a clamping assembly, the clamping assembly comprises a plurality of clamping parts, and the plurality of clamping parts are arranged in one-to-one correspondence with a plurality of helical segments of the screw rod; the driving device is drivingly connected with the screw rod to drive the screw rod to drive the plurality of clamping parts to move in a first direction or a second direction, thereby adjusting the clamping range of the clamping assembly; wherein the screw rod is the screw rod described above.

[0014] Further, the driving device is a motor, the motor shaft of the motor is drivingly connected with the screw rod, and the clamping mechanism further comprises: a detection device for acquiring the clamping range of the clamping assembly; a control module electrically connected with the motor and the detection device; wherein the control module controls the rotation angle of the motor shaft according to the detection value of the detection device to adjust the clamping range.

[0015] The technical scheme of the utility model is applied, the screw rod is used to drive the plurality of clamping parts to move, the screw rod comprises a screw rod body and a plurality of helical segments arranged at intervals along the central axis of the screw rod body, the plurality of helical segments are arranged in one-to-one correspondence with the plurality of clamping parts, each helical segment is matched with the clamping part corresponding thereto to drive the clamping part to move along the central axis of the screw rod body. In this way, since each helical segment is an equal-pitch helical segment, the pitches of the at least two helical segments are different, so that the spacing between the clamping parts corresponding to the at least two helical segments can be adjusted to realize the variable-pitch function of the clamping parts, and the rotation angle of the screw rod can be controlled according to the clamping range requirement of the clamping parts to accurately control the clamping range of the clamping parts.

[0016] Compared with the prior art, the variable distance function of the clamping part is realized by improving the structure of the lead screw, i.e. adjusting the parameters of the screw segment, so that the variable distance function is easier and simpler to realize, and the problem of complex structure of the cylinder used to realize the variable distance function of the clamping jaw in the prior art is solved, thereby reducing the machining cost and difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of this application form a part thereof, serve to further provide a further understanding of the present application, and together with the description of the exemplary embodiments of the present application, serve to explain the present application, and do not constitute an improper limitation of the present application. In the drawings:

[0018] Figure 1 A front view of an embodiment of the lead screw according to the present application is shown;

[0019] Figure 2 A perspective view of the lead screw in Figure 1 is shown;

[0020] Figure 3 A rear view of the lead screw in Figure 1 is shown;

[0021] Figure 4 A perspective structural schematic view of the clamping mechanism according to the present application when the clamping range is maximum is shown;

[0022] Figure 5 A front view of the clamping mechanism in Figure 4 when the clamping range is maximum is shown;

[0023] Figure 6 A perspective structural schematic view of the clamping mechanism in Figure 4 when the clamping range is minimum is shown;

[0024] Figure 7 A front view of the clamping mechanism in Figure 6 when the clamping range is minimum is shown;

[0025] Figure 8 A sectional view of the clamping mechanism in Figure 4 is shown.

[0026] Among them, the above drawings include the following reference signs:

[0027] 10, clamping part; 11, screw convex part; 20, lead screw body; 30, screw segment; 31, first screw segment; 32, second screw segment; 33, third screw segment. DETAILED DESCRIPTION

[0028] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0030] In the present application, unless otherwise stated, the orientation words such as "up, down" are generally directed to the direction shown in the drawings, or to the vertical, perpendicular or gravity direction; similarly, for the convenience of understanding and description, "left, right" is generally directed to the left and right shown in the drawings; "inner, outer" refers to the inner and outer relative to the contour of each component, but the above orientation words are not used to limit the present application.

[0031] As shown in Figures 1 to 3 The lead screw is used to drive the plurality of clamping parts 10 to move, and the lead screw includes a lead screw body 20 and a plurality of spiral segments 30. The plurality of spiral segments 30 are arranged along the central axis of the lead screw body 20, and the plurality of spiral segments 30 are arranged one-to-one corresponding to the plurality of clamping parts 10. Each spiral segment 30 cooperates with the corresponding clamping part 10 to drive the clamping part 10 to move along the central axis of the lead screw body 20. Among them, each spiral segment 30 is an equal pitch spiral segment, and the pitches of at least two spiral segments 30 are different.

[0032] By applying the technical scheme of the present embodiment, since each spiral segment 30 is an equal pitch spiral segment, and the pitches of at least two spiral segments 30 are different, the spacing between the clamping parts 10 corresponding to the at least two spiral segments 30 can be adjusted to realize the variable pitch function of the clamping parts 10. In addition, the rotation angle of the lead screw can be controlled according to the clamping range requirement of the clamping parts 10 to accurately control the clamping range of the clamping parts 10.

[0033] Compared with the prior art that uses a relatively complex structure of a cylinder to drive the clamping jaw to move to realize the variable pitch function, in the present embodiment, only by improving the structure of the lead screw, i.e. adjusting the parameters of the spiral segments 30, the variable pitch function of the clamping parts 10 can be realized, so that the realization of the variable pitch function is easier and more convenient, thereby solving the problem of the relatively complex structure of the cylinder used to realize the variable pitch function of the clamping jaw in the prior art, which increases the processing cost, and reducing the processing cost and difficulty.

[0034] Optionally, the spiral angle of each spiral segment 30 is greater than 0° and less than 360°. In this way, the above setting of the spiral angle not only ensures that there is no overlap between each spiral segment 30, but also enables the lead screw to complete the variable pitch function of the plurality of clamping parts 10 within a 360° rotation angle, thereby ensuring the variable pitch reliability.

[0035] In the embodiment, the helix angle of each helical segment 30 is 315°. In this way, the above-mentioned setting of the helix angle ensures the contact area between the lead screw and the clamping part 10, thereby improving the transmission efficiency and stability, and preventing the clamping part 10 from being displaced unnecessarily during rotation with the lead screw, thereby affecting the machining precision and product quality of the workpiece.

[0036] It should be noted that the value of the helix angle of each helical segment 30 is not limited thereto, and can be adjusted according to the working conditions and use requirements. Alternatively, the helix angle of each helical segment 30 is 345°, or 350°, or 355°.

[0037] Alternatively, the connecting line L1 of the starting positions of the two adjacent helical segments 30 is arranged to be parallel to the central axis of the lead screw body 20, and / or the connecting line L2 of the ending positions of the two adjacent helical segments 30 is arranged to be parallel to the central axis of the lead screw body. In this way, the above-mentioned parallel arrangement of the connecting line L1 and the connecting line L2 helps to maintain the linearity of the movement of the clamping part 10, avoids the deviation during the movement, and also improves the clamping stability of the clamping part 10 to the workpiece.

[0038] Alternatively, the plurality of helical segments 30 includes two helical segment groups, the two helical segment groups are symmetrical about the center surface CS of the lead screw body 20, each helical segment group includes a plurality of helical segments 30 arranged at intervals in the direction from the middle part to the end part of the lead screw body 20, the pitch P of any two helical segments 30 symmetrical about the center surface CS in the two helical segment groups is consistent, and satisfies: θ / 360 P=S2 / 2-S1 / 2; wherein θ is the helix angle (ending angle) of each helical segment 30, the distance S1 is the distance between the starting positions of the two helical segments, and S2 is the distance between the ending positions of the two helical segments.

[0039] In the embodiment, the distance S2 is greater than the distance S1, and the pitch P of the helical segment, the distance S1, the distance S2, the helix starting angle, and the helix angle satisfy the relationship in Table 1:

[0040] Table 1

[0041]

[0042] In actual application, in order to ensure the installation space of the actual clamping part and ensure the strength of the lead screw structure, the distance S1 can be selected as S1≥25mm. In this way, the above-mentioned setting of the distance S1 and the distance S2 can realize the rapid positioning of the clamping part 10 while ensuring the strength of the lead screw structure, thereby improving the variable distance flexibility of the clamping part 10. At the same time, the above-mentioned setting makes the distribution of the plurality of helical segments 30 on the lead screw more reasonable, so as to increase the number of the clamping part 10 under the premise of ensuring the strength of the lead screw structure, thereby expanding the clamping range of the clamping part 10.

[0043] In this embodiment, the distance S1 between the starting positions of every two adjacent spiral segments 30 is 30mm, and the distance S2 between the ending positions of every two adjacent spiral segments 30 is 100mm.

[0044] It should be noted that the value of the distance S1 between the starting positions of at least two adjacent spiral segments 30 is not limited to this and can be adjusted according to working conditions and usage requirements. Optionally, the distance S1 between the starting positions of at least two adjacent spiral segments 30 is 28mm or 32mm.

[0045] It should be noted that the value of the distance S2 between the termination positions of at least two adjacent spiral segments 30 is not limited to this and can be adjusted according to working conditions and usage requirements. Optionally, the distance S2 between the termination positions of at least two adjacent spiral segments 30 can be 95mm, 98mm, 105mm, or 108mm.

[0046] Optionally, along the direction from the middle to the end of the lead screw body 20, the pitch of at least two helical segments 30 gradually increases; and / or, the pitch difference between every two adjacent helical segments 30 is consistent. This pitch variation pattern allows the lead screw to flexibly adjust the clamping range according to changes in workpiece size when driving the clamping part 10, thus achieving the pitch-variable function of the clamping part 10. Simultaneously, the gradual increase in pitch or the consistent pitch difference design ensures uniform clamping force distribution when adjusting the clamping range, preventing damage to parts or impact on machining results due to excessive or insufficient clamping force.

[0047] In this embodiment, along the direction from the middle to the end of the lead screw body 20, the pitch of all helical segments 30 gradually increases and the pitch difference is consistent.

[0048] like Figures 1 to 3 As shown, the multiple helical segments 30 include two helical segment groups, which are symmetrically arranged about the center plane CS of the lead screw body 20. Each helical segment group includes a first helical segment 31, a second helical segment 32, and a third helical segment 33 arranged sequentially along the direction from the middle to the end of the lead screw body 20. The starting position of the first helical segment 31 has a preset distance from the center plane CS. The pitch of the second helical segment 32 is greater than the pitch of the first helical segment 31, and the pitch difference is ΔP1. The pitch of the third helical segment 33 is greater than the pitch of the second helical segment 32, and the pitch difference is ΔP2, satisfying: ΔP1=ΔP2. In this way, the above-mentioned symmetrical design and pitch difference control ensure the balance of the lead screw when driving the clamping part 10 to move, avoid vibration during the movement, and ensure the clamping stability and clamping accuracy of the clamping part 10.

[0049] In the embodiment, the pitch of the first screw segment 31 is smaller than the pitch of the second screw segment 32, and the pitch of the second screw segment 32 is smaller than the pitch of the third screw segment 33, so as to ensure that the clamping range of the clamping part 10 can be greatly adjusted within a limited stroke, and the adaptability of the clamping mechanism is improved. The pitches of the three screw segments in each screw segment group are increased in equal proportion.

[0050] Specifically, the pitch of the first screw segment 31 is 40 mm, the pitch of the second screw segment 32 is 120 mm, and the pitch of the third screw segment 33 is 200 mm.

[0051] Alternatively, the screw segment 30 is a spiral groove, and the spiral convex part 11 arranged on the clamping part 10 extends into the spiral groove and is limited and matched with the spiral groove; or the screw segment 30 is a spiral convex part 11, and the spiral convex part 11 extends into the spiral groove arranged on the clamping part 10 to be limited and matched with the spiral groove. In this way, the above-mentioned limited and matched design ensures the precise synchronous movement between the clamping part 10 and the screw rod, avoids assembly errors caused by sliding and displacement, and greatly improves the movement stability of the clamping part 10. At the same time, the above-mentioned arrangement makes the structure selection of the screw segment 30 more flexible to meet different use requirements and working conditions, and also improves the processing flexibility of the workers.

[0052] In the embodiment, the screw segment 30 is a spiral groove, and the spiral convex part 11 arranged on the clamping part 10 extends into the spiral groove and is limited and matched with the spiral groove, thereby increasing the matching area between the screw rod and the clamping part 10, and improving the movement stability of the clamping part 10.

[0053] Alternatively, the screw segment 30 is a spiral groove, and the spiral groove is at least one of a V-shaped groove, a U-shaped groove, a semicircular groove, and a polygonal groove. In this way, the above-mentioned arrangement makes the shape selection of the screw segment 30 more flexible to meet different use requirements and working conditions, and also improves the processing flexibility of the workers.

[0054] In the embodiment, the screw segment 30 is a trapezoidal groove.

[0055] In the embodiment, the design of the spiral groove adopts an Archimedes spiral line, which ensures the stability and precision of the screw rod when driving the clamping part 10 to move.

[0056] As shown in Figures 4 to 8 The application also provides a clamping mechanism, which comprises a driving device, a screw rod, and a clamping assembly. The clamping assembly comprises a plurality of clamping parts 10, and the plurality of clamping parts 10 are arranged in one-to-one correspondence with a plurality of screw segments 30 of the screw rod. The driving device is drivingly connected with the screw rod to drive the screw rod to drive the plurality of clamping parts 10 to move in a first direction or a second direction, thereby adjusting the clamping range of the clamping assembly. The screw rod is the above-mentioned screw rod.

[0057] Specifically, since each screw segment 30 arranged on the screw rod is an equal pitch screw segment, the pitches of at least two screw segments 30 are different, so that the interval between the clamping parts 10 corresponding to the at least two screw segments 30 can be adjusted to realize the variable pitch function of the clamping mechanism, and the rotation angle of the screw rod can be controlled according to the clamping range requirement of the clamping mechanism to accurately control the clamping range of the clamping mechanism.

[0058] Compared with the prior art that uses a cylinder to drive the movement of the clamping jaw to realize the variable pitch function, in the embodiment, the variable pitch function of the clamping mechanism can be realized by only improving the structure of the screw rod, i.e., adjusting the parameters of the screw segments, so that the realization of the variable pitch function is easier and simpler, thereby solving the problem of the prior art that the structure of the cylinder used to realize the variable pitch function of the clamping jaw is relatively complex and increases the processing cost, and reducing the processing cost and difficulty.

[0059] Optionally, the driving device is a motor, the motor shaft of the motor is drivingly connected with the screw rod, and the clamping mechanism further comprises a detection device and a control module. The detection device is used to obtain the clamping range of the clamping assembly, and the control module is electrically connected with the motor and the detection device. The control module controls the rotation angle of the motor shaft according to the detection value of the detection device to adjust the clamping range. In this way, the motor is used as the driving device, and the detection device and the control module are used to realize the closed loop control of the clamping range, so that the clamping mechanism can maintain high-precision clamping range adjustment under any working condition, so that the clamping mechanism realizes accurate variable pitch function.

[0060] From the above description, it can be seen that the embodiments of the utility model realize the following technical effects:

[0061] The screw rod is used to drive the movement of the plurality of clamping parts, the screw rod comprises a screw rod body and a plurality of screw segments arranged along the central axis of the screw rod body at intervals, the plurality of screw segments are arranged in one-to-one correspondence with the plurality of clamping parts, each screw segment cooperates with the clamping part corresponding thereto to drive the movement of the clamping part along the central axis of the screw rod body. In this way, since each screw segment is an equal pitch screw segment, the pitches of at least two screw segments are different, so that the interval between the clamping parts corresponding to the at least two screw segments can be adjusted to realize the variable pitch function of the clamping parts, and the rotation angle of the screw rod can be controlled according to the clamping range requirement of the clamping parts to accurately control the clamping range of the clamping parts.

[0062] Compared with the prior art, the variable distance function of the clamping part is realized by improving the structure of the screw rod, i.e., adjusting the parameters of the screw section, so that the variable distance function is easier and simpler to realize, and the problem of the complex structure of the cylinder used for realizing the variable distance function of the clamping jaw in the prior art is solved, thereby reducing the machining cost and difficulty.

[0063] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0064] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0065] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of the terms so designated are interchangeable under appropriate circumstances such that the description is to be understood as a description of any arrangement of the described or claimed embodiments or arrangements.

[0066] The preferred embodiments of the present application have been described above with the preferred embodiments; the present application is not limited to the above descriptions and can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A screw rod for moving a plurality of clamping portions (10), characterized in that, The screw rod comprises: a screw rod body (20); a plurality of helical segments (30) arranged along a central axis of the screw rod body (20), the plurality of helical segments (30) are arranged in one-to-one correspondence with the plurality of clamping portions (10), each helical segment (30) cooperates with the clamping portion (10) corresponding thereto to drive the clamping portion (10) to move along the central axis of the screw rod body (20); wherein each helical segment (30) is an equal-pitch helical segment, and the pitches of at least two helical segments (30) are different.

2. The lead screw of claim 1, wherein, The helix angle of each helical segment (30) is greater than 0° and less than 360°.

3. The lead screw of claim 1, wherein, The connecting line L1 of the starting positions of two adjacent helical segments (30) is arranged in parallel with the central axis of the screw rod body (20); and / or, the connecting line L2 of the ending positions of two adjacent helical segments (30) is arranged in parallel with the central axis of the screw rod body.

4. The lead screw of claim 1, wherein, In the direction from the middle part to the end part of the screw rod body (20), the pitch of at least two helical segments (30) gradually increases; and / or, the pitch difference of each adjacent two helical segments (30) is consistent.

5. The lead screw of claim 1, wherein, The plurality of helical segments (30) includes two helical segment groups symmetrical about a center plane CS of the screw body (20), each helical segment group including a plurality of helical segments (30) arranged at intervals in a direction from a middle portion to an end portion of the screw body (20), the helical pitch P of any two helical segments (30) symmetrical about the center plane CS in the two helical segment groups being identical, and satisfying: θ / 360 P = S2 / 2 - S1 / 2; where θ is a helix angle of each of the helical segments (30), S1 is a distance between start positions of the two helical segments, and S2 is a distance between end positions of the two helical segments.

6. The lead screw of claim 1, wherein, The plurality of helical segments (30) comprises two helical segment groups, the two helical segment groups are symmetrically arranged about the central surface CS of the screw rod body (20), each helical segment group comprises a first helical segment (31), a second helical segment (32) and a third helical segment (33) arranged in sequence in the direction from the middle part to the end part of the screw rod body (20), the first helical segment (31) has a preset distance between the starting position and the central surface CS, the pitch of the second helical segment (32) is greater than the pitch of the first helical segment (31) and the pitch difference is △P1, the pitch of the third helical segment (33) is greater than the pitch of the second helical segment (32) and the pitch difference is △P2, and it satisfies: △P1=△P2.

7. The lead screw of claim 1, wherein, The helical segment (30) is a helical groove, and the helical protrusion (11) arranged on the clamping portion (10) extends into the helical groove and is limitedly matched with the helical groove; or the helical segment (30) is a helical protrusion (11), and the helical protrusion (11) extends into the helical groove arranged on the clamping portion (10) to be limitedly matched with the helical groove.

8. The lead screw of claim 1, wherein, The helical segment (30) is a helical groove, and the helical groove is at least one of a V-shaped groove, a U-shaped groove, a semicircular groove and a polygonal groove.

9. A clamping mechanism, characterized by The driving device, the screw rod and the clamping assembly are provided, the clamping assembly comprises a plurality of clamping portions (10), the plurality of clamping portions (10) are arranged in one-to-one correspondence with a plurality of helical segments (30) of the screw rod; the driving device is drivingly connected with the screw rod to drive the screw rod to drive the plurality of clamping portions (10) to move in a first direction or a second direction, thereby adjusting the clamping range of the clamping assembly; wherein the screw rod is the screw rod according to any one of claims 1 to 8.

10. The clamping mechanism of claim 9, wherein, The driving device is a motor, a motor shaft of the motor is drivingly connected with the screw rod, and the clamping mechanism further comprises: a detection device for acquiring the clamping range of the clamping assembly; A control module is electrically connected with the motor and the detection device; The control module controls the rotation angle of the motor shaft according to the detection value of the detection device to adjust the clamping range.

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