Tensioning device for building block type screw and tensioning method of tensioning device

Abstract

The invention relates to a tensioning device for a building block type screw and a tensioning method of the tensioning device. The tensioning device comprises a stretching piece, a pressing piece, a telescopic piece and a driving piece. The stretching piece is used for being connected with a locking piece of the building block type screw. The pressing piece is used for being connected with a thread element of the building block type screw. One end of the telescopic piece is connected with the stretching piece, and the other end of the telescopic piece is connected with the pressing piece; the driving part is connected with the telescopic part and used for driving the telescopic part to do telescopic motion. Compared with the prior art, the stretching piece and the pressing piece only transmit axial force to the shaft core and the thread element, the tensioning force transmission efficiency is high, and compared with a radial screwing mode of a traditional torque wrench, radial loads are not borne between the shaft core and the thread element; the problem that the friction coefficient is increased due to torsional deformation of the thread element and the shaft core spline is solved.

Description

Technical Field

[0001] The invention relates to the field of screw rod installation tools, and in particular to a tensioning device for a building block type screw rod and a tensioning method thereof. Background Art

[0002] Parallel twin-screw extruders are widely used in filling, blending, modification, reinforcement, devolatilization of chlorinated polypropylene and super absorbent resins of rubber and plastics and engineering resins; extrusion of degradable masterbatch, polyamide polycondensation, polyurethane polyaddition reaction; granulation of carbon powder and magnetic powder, preparation of cable insulation materials, sheath materials, low-smoke and low-halogen flame-retardant PVC cable materials and various silane cross-linking materials, etc. Its characteristic is that it uses two parallel rotating screws to extrude the raw materials into shape through shearing, melting, mixing and extrusion. With the increasing market demand for high torque, high speed and high output, the development of parallel twin-screw extruders is also evolving.

[0003] In this development process, the building block screw plays an important role as a key component of the parallel twin-screw extruder. It adopts a "building block" structure, connecting and fixing multiple different threaded elements in series on the mandrel. The assembled screw needs to withstand high torque from the drive unit during high-speed rotation. Therefore, extremely high requirements are placed on the torsion resistance, stability and processing accuracy of the building block screw.

[0004] The traditional building block screw tensioning method is usually achieved by applying a specific preload force on the screw head nut. However, due to the multiple threaded elements in series on the building block screw and the unevenness in the preload process, such as the thread contact state, the accuracy of the torque and the operator's experience, it is difficult to meet the requirements of high speed, high torque and high output.

[0005] Therefore, this paper proposes to design a new type of building block screw tensioning device, aiming to ensure that the threaded elements of the building block screw are subjected to uniform contact pressure, thereby reducing stress concentration, improving the torsional stiffness and load-bearing capacity of the screw, and ensuring that the screw can operate stably and efficiently under high torque and high load working conditions. Summary of the invention

[0006] The purpose of the present invention is to provide a tensioning device and a tensioning method for a building block screw in order to overcome the defects of the prior art.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A tensioning device for a building block screw, comprising:

[0009] A stretching piece, the stretching piece is used to connect with the locking piece of the building block screw;

[0010] A pressing piece, the pressing piece is used to connect with the threaded element of the building block screw;

[0011] A telescopic member, one end of which is connected to the stretching member, and the other end of which is connected to the pressing member;

[0012] A driving member is connected to the telescopic member and is used to drive the telescopic member to perform telescopic motion.

[0013] In one of the embodiments, a threaded hole is provided on the stretching member, and one end of the locking member can be inserted into the threaded hole and threadedly connected to the stretching member.

[0014] In one embodiment, the telescopic member includes an inner telescopic ring sleeved on the stretching member and an outer telescopic ring sleeved on the inner telescopic ring. A shoulder is provided on the end of the stretching member away from the locking member, the inner telescopic ring abuts against the shoulder, and the outer telescopic ring is connected to the clamping member.

[0015] In one embodiment, the clamping member is a clamping ring, which is sleeved on the stretching member, one end of the clamping ring abuts against the outer telescopic ring, and the other end of the clamping ring is used to abut against the end face of the threaded element.

[0016] In one of the embodiments, the tensioning device further includes a fixing component, which is sleeved on the outer telescopic ring and abuts against two ends of the outer telescopic ring respectively.

[0017] In one embodiment, the fixing assembly includes a first fixing ring and a second fixing ring connected to each other, the first fixing ring is sleeved on the outer telescopic ring and respectively abuts against one end face and an outer peripheral surface of the outer telescopic ring, the second fixing ring is sleeved on the outer telescopic ring and respectively abuts against the other end face and the outer peripheral surface of the outer telescopic ring, the stretching member and the inner telescopic ring can movably pass through the first fixing ring, and the pressing member can movably pass through the second fixing ring.

[0018] In one of the embodiments, the tensioning device further includes a protective sleeve, which is sleeved on the clamping ring and connected to the clamping ring.

[0019] In one of the embodiments, the locking member includes a locking stud and a locking nut, one end of the locking stud is connected to the shaft core of the building block screw, and the other end of the locking stud can be connected to the tensile member, the locking nut is threadedly connected to the locking stud and abuts against the threaded element, and the clamping ring and the protective sleeve are correspondingly provided with a first operating hole and a second operating hole, and the nut can be rotated through the first operating hole and the second operating hole in sequence.

[0020] In one of the embodiments, a lifting ring is provided on the fixing assembly.

[0021] A method for tensioning a building block screw, using the tensioning device, comprises the following specific steps:

[0022] S10: sequentially sleeve a plurality of threaded elements on the shaft core of the building block screw, and install a locking piece on the end surface of the shaft core so that the locking piece abuts against the end surface of the threaded element;

[0023] S20: Connecting the tensioning member of the tensioning device to the locking member;

[0024] S30: Connecting the pressing member of the tensioning device to the threaded element;

[0025] S40: controlling the extension of the telescopic member of the tensioning device through the driving member;

[0026] S50: The telescopic member is maintained in an extended state by the driving member, and the locking member is operated to abut against the end surface of the threaded element again.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] 1. The above-mentioned tensioning device is provided with a tensile member and a pressing member connected with the locking member and the threaded element respectively, and a telescopic member is provided between the tensile member and the pressing member. During use, the tensile member is first connected to the locking member, and the pressing member is connected to the threaded element, and then the telescopic member is controlled to extend by the driving member to drive the tensile member and the pressing member to move relatively away from each other, so that the locking member drives the shaft core and the threaded element to move relatively, and the multiple threaded elements connected in series on the shaft core are compressed, and the locking member is further tightened to abut the threaded element, so that the tensioning of the building block screw can be completed; because the telescopic member controls the tensile member and the pressing member to move axially through telescopic control, the tensile member and the pressing member only transmit axial force to the shaft core and the threaded element, so that the tensioning force transmission efficiency is high, and compared with the radial tightening method of the traditional torque wrench, the shaft core and the threaded element do not bear radial load, avoiding the problem of increased friction coefficient due to torsional deformation of the threaded element and the shaft core spline.

[0029] 2. A threaded hole is provided on the tensile member, and the tensile member is threadedly connected to the locking member through the threaded hole, which is conducive to adapting to the general structure of the locking member, improving the reliability of the connection between the tensile member and the locking member, and improving the bearing capacity of the connection during the tensioning process.

[0030] 3. The telescopic member includes an inner telescopic ring and an outer telescopic ring which can move relatively, and the clamping member is a clamping ring, which are both sleeved on the tensile member, and the tensile member is provided with a shoulder. Therefore, by making the inner telescopic ring abut against the shoulder and the outer telescopic ring abut against the clamping ring, the tensile member and the clamping member can be driven to move relative to each other, which effectively improves the convenience of use of the tensioning device.

[0031] 4. The fixing assembly is used to limit the axial position and radial position of the telescopic ring, and a first fixing ring and a second fixing ring connected to each other are provided to limit the upper and lower ends of the outer telescopic ring respectively. The structure is simple and the disassembly is convenient.

[0032] 5. The protective sleeve is connected to the clamping ring. When in use, one end is sleeved on the clamping ring and the other end is sleeved on the threaded element to avoid interference between other components of the tensioning device and the threaded element. At the same time, the first operating hole and the second operating hole are correspondingly provided on the clamping ring and the protective sleeve. After the threaded element on the shaft core is tightened, the operating tool can pass through the first operating hole and the second operating hole to rotate the locking piece, and tighten the locking piece again, thereby finally realizing the tensioning of the building block screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is the front view of the tensioning device in the present invention.

[0034] Figure 2 It is a bottom view of the tensioning device in the present invention.

[0035] Figure 3 It is a cross-sectional view of the tensioning device in the present invention.

[0036] Figure 4 It is a cross-sectional view of the tensioning device and the building block screw in the present invention when connected.

[0037] Figure 5 It is a cross-sectional view of the building block screw in the present invention.

[0038] Figure 6 It is a stereoscopic diagram of the tensioning device and the building block screw in the present invention when connected.

[0039] Figure 7 It is a schematic diagram of the flow of the building block type screw tensioning method in the present invention.

[0040] : 100, tensioning device; 10, stretching member; 11, threaded hole; 12, shoulder; 20, pressing member; 21, first operating hole; 30, telescopic member; 31, inner telescopic ring; 32, outer telescopic ring; 40, driving member; 50, fixing assembly; 51, first fixing ring; 52, second fixing ring; 60, protective sleeve; 61, second operating hole; 70, lifting ring; 80, building block screw; 81, locking member; 811, locking stud; 812, locking nut; 82, threaded element; 83, shaft core; 84, screw cap. DETAILED DESCRIPTION

[0041] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0042] A tensioning device 100 for a building block screw 80 and a tensioning method thereof in some embodiments are described in detail below with reference to the accompanying drawings.

[0043] like Figures 1 to 6 As shown, in one embodiment, a tensioning device 100 for a building block screw 80 is provided, comprising a tensioning member 10, a pressing member 20, a telescopic member 30 and a driving member 40;

[0044] Among them, the stretching member 10 is used to connect with the locking member 81 of the building block screw 80; the pressing member 20 is used to connect with the threaded element 82 of the building block screw 80; one end of the telescopic member 30 is connected to the stretching member 10, and the other end of the telescopic member 30 is connected to the pressing member 20; the driving member 40 is connected to the telescopic member 30, and is used to drive the telescopic member 30 to telescopic movement.

[0045] The tensioning device 100 is provided with a tensioning member 10 and a pressing member 20 connected to the locking member 81 and the threaded element 82 respectively, and a telescopic member 30 is provided between the tensioning member 10 and the pressing member 20. During use, the tensioning member 10 is first connected to the locking member 81, and the pressing member 20 is connected to the threaded element 82. Then, the telescopic member 30 is controlled to extend by the driving member 40, so that the tensioning member 10 and the pressing member 20 are relatively separated, so that the locking member 81 drives the shaft core 83 and the threaded element 82 to move relative to each other, and the multiple threaded elements connected in series on the shaft core 83 are moved. 82 is compressed, and the locking member 81 is further tightened to abut the threaded element 82, so that the building block screw 80 can be tensioned; because the telescopic member 30 controls the axial movement of the tensioning member 10 and the clamping member 20 through telescopic control, the tensioning member 10 and the clamping member 20 only transmit axial force to the shaft core 83 and the threaded element 82, so that the tensioning force transmission efficiency is high. Compared with the radial tightening method of the traditional torque wrench, the shaft core 83 and the threaded element 82 do not bear radial loads, avoiding the problem of increased friction coefficient due to torsional deformation of the spline of the threaded element 82 and the shaft core 83.

[0046] Specifically, Figure 3 and Figure 4 As shown, in one embodiment, a threaded hole 11 is provided on the tension member 10, and one end of the locking member 81 can be inserted into the threaded hole 11 and threadedly connected to the tension member 10. The threaded hole 11 is provided on the tension member 10, and the locking member 81 is threadedly connected through the threaded hole 11, which is conducive to adapting to the general structure of the locking member 81, improving the reliability of the connection between the tension member 10 and the locking member 81, and improving the bearing capacity of the connection during the tensioning process.

[0047] Specifically, Figure 3 and Figure 4 As shown, in one embodiment, the telescopic member 30 includes an inner telescopic ring 31 sleeved on the stretching member 10 and an outer telescopic ring 32 sleeved on the inner telescopic ring 31. A shoulder 12 is provided on the end of the stretching member 10 away from the locking member 81. The inner telescopic ring 31 abuts against the shoulder 12, and the outer telescopic ring 32 is connected to the clamping member 20.

[0048] Among them, the telescopic member 30 includes a hydraulic telescopic cylinder, a pneumatic telescopic cylinder and an electric telescopic cylinder. Preferably, the telescopic member 30 is a hydraulic telescopic cylinder, a liquid containing chamber is provided between the inner telescopic ring 31 and the outer telescopic ring 32, and the driving member 40 is a hydraulic pump. The hydraulic pump is connected to the liquid containing chamber through a hose, so the tensioning pressure can be set by the hydraulic pump, and a specific tensioning pressure can be achieved by injecting a specific volume of liquid into the hydraulic telescopic cylinder through the hydraulic pump.

[0049] Furthermore, if Figure 3 and Figure 4 As shown, in one embodiment, the clamping member 20 is a clamping ring, which is sleeved on the tensile member 10, one end of the clamping ring abuts against the outer telescopic ring 32, and the other end of the clamping ring abuts against the end face of the threaded element 82. The telescopic member 30 includes an inner telescopic ring 31 and an outer telescopic ring 32 that can move relatively. The clamping member 20 is a clamping ring, which is sleeved on the tensile member 10, and the tensile member 10 is provided with a shoulder 12. Therefore, by making the inner telescopic ring 31 abut against the shoulder 12 and the outer telescopic ring 32 abut against the clamping ring, the tensile member 10 and the clamping member 20 can be driven to move relative to each other, which effectively improves the convenience of use of the tensioning device 100.

[0050] Furthermore, if Figure 2 , Figure 3 and Figure 4 As shown, in one embodiment, the tensioning device 100 further includes a fixing assembly 50 , which is sleeved on the outer telescopic ring 32 and abuts against two ends of the outer telescopic ring 32 .

[0051] In this specific embodiment, Figure 3 and Figure 4 As shown, the fixing assembly 50 includes a first fixing ring 51 and a second fixing ring 52 connected to each other. The first fixing ring 51 is sleeved on the outer telescopic ring 32 and respectively abuts against one end face and the outer peripheral surface of the outer telescopic ring 32. The second fixing ring 52 is sleeved on the outer telescopic ring 32 and respectively abuts against the other end face and the outer peripheral surface of the outer telescopic ring 32. The tensioning member 10 and the inner telescopic ring 31 can move through the first fixing ring 51, and the pressing member 20 can move through the second fixing ring 52. The fixing assembly 50 is used to limit the axial position and radial position of the telescopic ring, and is provided with a first fixing ring 51 and a second fixing ring 52 connected to each other to respectively limit the upper and lower ends of the outer telescopic ring 32. The structure is simple and easy to disassemble.

[0052] The first fixing ring 51 and the second fixing ring 52 are connected by bolts and nuts, and the bolts pass through the first fixing ring 51 and the second fixing ring 52 in sequence and are connected to the nuts, which facilitates the installation and disassembly of the fixing assembly 50 and the replacement of the telescopic member 30.

[0053] Furthermore, if Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, the tensioning device 100 further includes a protective sleeve 60, which is sleeved on the clamping ring and connected to the clamping ring. The protective sleeve 60 is connected to the clamping ring, and when in use, one end of the protective sleeve 60 is sleeved on the clamping ring, and the other end is sleeved on the threaded element 82, so as to prevent other components of the tensioning device 100 from interfering with the threaded element 82.

[0054] In this specific embodiment, Figure 2 , Figure 3 and Figure 5 As shown, in one embodiment, the locking member 81 includes a locking stud 811 and a locking nut 812, one end of the locking stud 811 is connected to the shaft core 83 of the building block screw 80, the other end of the locking stud 811 can be connected to the tension member 10, the locking nut 812 is threadedly connected to the locking stud 811 and abuts against the threaded element 82, the first operating hole 21 and the second operating hole 61 are correspondingly provided on the clamping ring and the protective sleeve 60, and the nut can be rotated by passing through the first operating hole 21 and the second operating hole 61 in sequence. At the same time, the first operating hole 21 and the second operating hole 61 are correspondingly provided on the clamping ring and the protective sleeve 60, after the threaded element 82 on the shaft core 83 is pressed, the operating tool can pass through the first operating hole 21 and the second operating hole 61 to rotate the locking member 81, and tighten the locking member 81 again, and finally the tensioning of the building block screw 80 is achieved.

[0055] The protective sleeve 60 is connected to the clamping ring by screws, and the screws pass through the protective sleeve 60 and the outer wall of the clamping ring in sequence to connect.

[0056] Specifically, Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, a lifting ring 70 is provided on the fixing assembly 50. A mounting plate is provided on the fixing assembly 50, and two ends of the mounting plate are respectively connected to the first fixing ring 51 and the second fixing ring 52. A bolt connection portion is provided on the lifting ring 70, and the lifting ring 70 is threadedly connected to the mounting plate through the bolt connection portion. The lifting ring 70 is used to hang or store the tensioning device 100, and the threaded connection portion makes the lifting ring 70 easy to install and disassemble.

[0057] like Figure 7As shown, in one embodiment, a tensioning method of a building block screw 80 is provided, using the tensioning device 100 described above, including the following specific steps:

[0058] S10: A plurality of threaded elements 82 are sequentially sleeved on the shaft core 83 of the modular screw 80, and a locking member 81 is installed on the end surface of the shaft core 83, so that the locking member 81 abuts against the end surface of the threaded element 82;

[0059] S20: Connecting the tensioning member 10 of the tensioning device 100 to the locking member 81;

[0060] S30: Connecting the pressing member 20 of the tensioning device 100 to the threaded element 82;

[0061] S40: controlling the extension of the telescopic member 30 of the tensioning device 100 through the driving member 40;

[0062] S50 : The extended state of the telescopic member 30 is maintained by the driving member 40 , and the locking member 81 is operated to make it contact with the end surface of the threaded element 82 again.

[0063] Specifically, Figure 5 As shown, after step S50, the following steps are also included: installing a screw cap 84 on the locking member 81, the screw cap 84 is used to close the gap between the shaft core 83 and the threaded element 82 to prevent the plastic melt from entering the gap when the building block screw 80 is working.

[0064] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0068] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0069] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A tensioning device for a building block screw, characterized in that: include: A stretching member (10), wherein the stretching member (10) is used to be connected to a locking member (81) of a building block screw (80); A pressing member (20), the pressing member (20) being used to be connected to a threaded element (82) of a building block screw (80); A telescopic member (30), one end of the telescopic member (30) is connected to the stretching member (10), and the other end of the telescopic member (30) is connected to the pressing member (20); A driving member (40) is connected to the telescopic member (30) and is used to drive the telescopic member (30) to perform telescopic movement.

2. A tensioning device for a building block screw according to claim 1, characterized in that: The stretching member (10) is provided with a threaded hole (11), and one end of the locking member (81) can be inserted into the threaded hole (11) and threadedly connected to the stretching member (10).

3. A tensioning device for a building block screw according to claim 1, characterized in that: The telescopic member (30) comprises an inner telescopic ring (31) sleeved on the stretching member (10) and an outer telescopic ring (32) sleeved on the inner telescopic ring (31); an end of the stretching member (10) away from the locking member (81) is provided with a shoulder (12); the inner telescopic ring (31) abuts against the shoulder (12); and the outer telescopic ring (32) is connected to the pressing member (20).

4. A tensioning device for a building block screw according to claim 3, characterized in that: The clamping member (20) is a clamping ring, which is sleeved on the stretching member (10), one end of the clamping ring abuts against the outer telescopic ring (32), and the other end of the clamping ring is used to abut against the end surface of the threaded element (82).

5. A tensioning device for a building block screw according to claim 3, characterized in that: The tensioning device further comprises a fixing assembly (50), wherein the fixing assembly (50) is sleeved on the outer telescopic ring (32) and abuts against two ends of the outer telescopic ring (32) respectively.

6. A tensioning device for a building block screw according to claim 5, characterized in that: The fixing assembly (50) comprises a first fixing ring (51) and a second fixing ring (52) which are connected to each other. The first fixing ring (51) is sleeved on the outer telescopic ring (32) and respectively abuts against one end face and an outer peripheral face of the outer telescopic ring (32). The second fixing ring (52) is sleeved on the outer telescopic ring (32) and respectively abuts against the other end face and an outer peripheral face of the outer telescopic ring (32). The stretching member (10) and the inner telescopic ring (31) can movably pass through the first fixing ring (51), and the pressing member (20) can movably pass through the second fixing ring (52).

7. A tensioning device for a building block screw according to claim 5, characterized in that: The tensioning device further comprises a protective sleeve (60), wherein the protective sleeve (60) is sleeved on the clamping ring and connected to the clamping ring.

8. A tensioning device for a building block screw according to claim 7, characterized in that: The locking member (81) includes a locking stud (811) and a locking nut (812), one end of the locking stud (811) is connected to the shaft core (83) of the building block screw (80), and the other end of the locking stud (811) can be connected to the tension member (10), the locking nut (812) is threadedly connected to the locking stud (811) and abuts against the threaded element (82), and the clamping ring and the protective sleeve (60) are correspondingly provided with a first operating hole (21) and a second operating hole (61), and the nut can be rotated through the first operating hole (21) and the second operating hole (61) in turn.

9. A tensioning device for a building block screw according to claim 5, characterized in that: The fixing assembly (50) is provided with a lifting ring (70).

10. A method for tightening a building block screw, characterized in that: Using the tensioning device according to any one of claims 1 to 9 comprises the following specific steps: S10: sequentially sleeve a plurality of threaded elements (82) on the shaft core (83) of the modular screw rod (80), and install a locking member (81) on the end surface of the shaft core (83) so that the locking member (81) abuts against the end surface of the threaded element (82); S20: Connecting the tensioning member (10) of the tensioning device to the locking member (81); S30: Connecting the pressing member (20) of the tensioning device to the threaded element (82); S40: controlling the extension of the telescopic member (30) of the tensioning device through the driving member (40); S50: The extended state of the telescopic member (30) is maintained by the driving member (40), and the locking member (81) is operated to make it abut against the end surface of the threaded element (82) again.

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