A tensioning device for a modular screw rod and a method of tensioning the same

Abstract

The application relates to a tensioning device for a building block screw rod and a tensioning method thereof, and the tensioning device comprises a stretching piece, a pressing piece, an extension piece and a driving piece; the stretching piece is used for being connected with a locking piece of the building block screw rod; the pressing piece is used for being connected with a threaded element of the building block screw rod; one end of the extension piece is connected with the stretching piece, and the other end of the extension piece is connected with the pressing piece; the driving piece is connected with the extension piece and is used for driving the extension piece to perform extension and retraction movements. Compared with the prior art, the stretching piece and the pressing piece only transmit axial force to the shaft core and the threaded element, the transmission efficiency of the tensioning force is high, compared with a radial tightening mode of a traditional torque wrench, no radial load is borne between the shaft core and the threaded element, and problems such as increase of a friction coefficient caused by torsional deformation of the threaded element and the shaft core spline are avoided.

Description

Technical Field

[0001] This invention relates to the field of screw installation tools, and in particular to a tensioning device and tensioning method for modular screws. Background Technology

[0002] Parallel twin-screw extruders are widely used in the filling, blending, modification, and reinforcement of rubber, plastics, and engineering resins; the devolatilization treatment of chlorinated polypropylene and superabsorbent resins; the extrusion of biodegradable masterbatches, polyamide condensation, and polyurethane addition polymerization; the granulation of toner and magnetic powder; and the preparation of cable insulation materials, sheathing materials, low-smoke, low-halogen flame-retardant PVC cable materials, and various silane crosslinking materials. Their key feature is the use of two parallel rotating screws, which extrude raw materials into shapes 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 constantly evolving.

[0003] In this development process, the modular screw plays a crucial role as a key component of the parallel twin-screw extruder. It employs a "building block" structure, connecting and fixing multiple different threaded elements on a 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 modular screw's torsional resistance, stability, and machining precision.

[0004] Traditional modular screw tensioning methods typically achieve this by applying a specific preload to the screw head nut. However, due to the multiple threaded elements connected in series on the modular screw and the unevenness during the preload process, such as thread contact conditions, torque accuracy, and operator experience, it is difficult to meet the requirements of high speed, high torque, and high output.

[0005] Therefore, this paper proposes the design of a novel modular screw tensioning device, which aims to ensure that the threaded elements of the modular 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 conditions. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects of the prior art by providing a tensioning device and tensioning method for modular screws.

[0007] The objective of this invention can be achieved through the following technical solutions:

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

[0009] A tension member for connecting to a locking member of a modular screw;

[0010] A clamping element for connection with a threaded element of a modular screw;

[0011] A telescopic component, one end of which is connected to the tensioning component, and the other end of which is connected to the clamping component;

[0012] A driving component, which is connected to the telescopic component, is used to drive the telescopic component to extend or retract.

[0013] In one embodiment, the tension member has a threaded hole, and one end of the locking member can be inserted into the threaded hole and threadedly connected to the tension member.

[0014] In one embodiment, the telescopic member includes an inner telescopic ring sleeved on the tension member and an outer telescopic ring sleeved on the inner telescopic ring. The tension member has a shoulder at one end 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 tensioning member. One end of the clamping ring abuts against the outer telescopic ring, and the other end of the clamping ring abuts against the end face of the threaded element.

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

[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 abuts against one end face and the outer peripheral surface of the outer telescopic ring, respectively. The second fixing ring is sleeved on the outer telescopic ring and abuts against the other end face and the outer peripheral surface of the outer telescopic ring, respectively. The tensioning member and the inner telescopic ring can move through the first fixing ring, and the clamping member can move through the second fixing ring.

[0018] In one embodiment, the tensioning device further includes a protective sleeve, which is fitted onto the clamping ring and connected to the clamping ring.

[0019] In one embodiment, the locking member includes a locking stud and a locking nut. One end of the locking stud is connected to the shaft of the modular screw, and the other end of the locking stud can be connected to the tensioning member. The locking nut is threadedly connected to the locking stud and abuts against the threaded element. The clamping ring and the protective sleeve are respectively provided with a first operating hole and a second operating hole, and the nut can be rotated by passing through the first operating hole and the second operating hole in sequence.

[0020] In one embodiment, the fixing component is provided with a lifting ring.

[0021] A method for tensioning a modular screw, using the aforementioned tensioning device, includes the following specific steps:

[0022] S10: Multiple threaded elements are sequentially fitted onto the shaft core of the modular screw, and a locking element is installed on the end face of the shaft core so that the locking element abuts against the end face of the threaded element.

[0023] S20: Connect the tensioning component and the locking component of the tensioning device;

[0024] S30: Connect the clamping element of the tensioning device to the threaded element;

[0025] S40: The extension of the telescopic component of the tensioning device is controlled by the drive component;

[0026] S50: The telescopic member is kept in an extended state by the drive member, and the locking member is operated to make it abut against the end face 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 configured with a tensioning component and a clamping component connected to a locking component and a threaded element, respectively. A telescopic component is provided between the tensioning component and the clamping component. During use, the tensioning component is first connected to the locking component, and the clamping component is connected to the threaded element. Then, the telescopic component is extended by the driving component, causing the tensioning component and the clamping component to move away from each other. This causes the locking component to move the shaft core and the threaded element relative to each other, pressing the multiple threaded elements connected in series on the shaft core. Further tightening the locking component to abut the threaded element completes the tensioning of the modular screw. Since the telescopic component controls the axial movement of the tensioning component and the clamping component through extension and retraction, the tensioning component and the clamping component only transmit axial force to the shaft core and the threaded element, resulting in high tension force transmission efficiency. Compared with the radial tightening method of the traditional torque wrench, the shaft core and the threaded element do not bear radial load, avoiding problems such as increased friction coefficient caused by torsional deformation of the threaded element and the spline of the shaft core.

[0029] 2. The tensioning component is provided with a threaded hole, which is threaded to the locking component. This facilitates the adaptation to the general structure of the locking component, improves the reliability of the connection between the tensioning component and the locking component, and increases the load-bearing capacity of the connection during tensioning.

[0030] 3. The telescopic components include an inner telescopic ring and an outer telescopic ring that can move relative to each other, and a pressing component is a pressing ring. Both are sleeved on the tensioning component, and the tensioning component is provided with a shoulder. Therefore, by making the inner telescopic ring abut against the shoulder and the outer telescopic ring abut against the pressing ring, the tensioning component and the pressing component can be moved relative to each other, which effectively improves the ease of use of the tensioning device.

[0031] 4. The fixing component is used to limit the axial and radial positions of the telescopic ring, and is provided with a first fixing ring and a second fixing ring that are connected to each other, respectively limiting the upper and lower ends of the outer telescopic ring. The structure is simple and easy to disassemble.

[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 prevent interference between other components of the tensioning device and the threaded element. At the same time, the clamping ring and the protective sleeve are provided with a first operating hole and a second operating hole respectively. After the threaded element on the shaft is tightened, the operating tool can pass through the first operating hole and the second operating hole to rotate the locking part and tighten the locking part again, so as to finally achieve the tensioning of the modular screw. Attached Figure Description

[0033] Figure 1 This is a front view of the tensioning device in this invention.

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

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

[0036] Figure 4 This is a cross-sectional view of the tensioning device and the modular screw in this invention.

[0037] Figure 5 This is a cross-sectional view of the modular screw in this invention.

[0038] Figure 6 This is a perspective view of the tensioning device and the modular screw in this invention.

[0039] Figure 7 This is a schematic diagram of the process for the modular screw tensioning method in this invention.

[0040] Reference numerals: 100, tensioning device; 10, tensioning component; 11, threaded hole; 12, shoulder; 20, clamping component; 21, first operating hole; 30, telescopic component; 31, inner telescopic ring; 32, outer telescopic ring; 40, driving component; 50, fixing assembly; 51, first fixing ring; 52, second fixing ring; 60, protective sleeve; 61, second operating hole; 70, lifting eye; 80, modular screw; 81, locking component; 811, locking stud; 812, locking nut; 82, threaded element; 83, shaft core; 84, screw cap. Detailed Implementation

[0041] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0042] The following describes in detail, with reference to the accompanying drawings, a tensioning device 100 for a modular screw 80 and its tensioning method in some embodiments.

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

[0044] The tension member 10 is used to connect with the locking member 81 of the modular screw 80; the clamping member 20 is used to connect with the threaded element 82 of the modular screw 80; one end of the telescopic member 30 is connected to the tension member 10, and the other end of the telescopic member 30 is connected to the clamping member 20; the driving member 40 is connected to the telescopic member 30 and is used to drive the telescopic member 30 to telescopically move.

[0045] The aforementioned tensioning device 100 includes a tensioning member 10 and a clamping member 20 connected to a locking member 81 and a threaded element 82, respectively. A telescopic member 30 is positioned between the tensioning member 10 and the clamping member 20. During use, the tensioning member 10 is first connected to the locking member 81, and the clamping member 20 is connected to the threaded element 82. Then, the telescopic member 30 is extended by the driving member 40, causing the tensioning member 10 and the clamping member 20 to move away from each other. This causes the locking member 81 to move the shaft core 83 relative to the threaded element 82, thereby moving the multiple threaded elements connected in series on the shaft core 83. Tightening 82 and further tightening the locking part 81 against the threaded element 82 completes the tensioning of the modular screw 80. Since the telescopic part 30 controls the axial movement of the tensioning part 10 and the clamping part 20 through telescopic control, the tensioning part 10 and the clamping part 20 only transmit axial force to the shaft core 83 and the threaded element 82, making the tension force transmission efficiency 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 load, avoiding problems such as increased friction coefficient caused by torsional deformation of the spline of the threaded element 82 and the shaft core 83.

[0046] Specifically, such as Figure 3 and Figure 4 As shown, in one embodiment, the tensioning 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 tensioning member 10. The threaded hole 11 on the tensioning member 10, and the threaded connection between the tensioning member 10 and the locking member 81 through the threaded hole 11, facilitates the adaptation to the general structure of the locking member 81, improves the reliability of the connection between the tensioning member 10 and the locking member 81, and increases the load-bearing capacity of the connection during tensioning.

[0047] Specifically, such as Figure 3 and Figure 4 As shown, in one embodiment, the telescopic member 30 includes an inner telescopic ring 31 sleeved on the tension member 10 and an outer telescopic ring 32 sleeved on the inner telescopic ring 31. The tension member 10 has a shoulder 12 at one end 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 pressing member 20.

[0048] The telescopic component 30 includes a hydraulic telescopic cylinder, a pneumatic telescopic cylinder, and an electric telescopic cylinder. Preferably, the telescopic component 30 is a hydraulic telescopic cylinder. A liquid receiving cavity is provided between the inner telescopic ring 31 and the outer telescopic ring 32. The driving component 40 is a hydraulic pump. The hydraulic pump is connected to the liquid receiving cavity through a hose. Therefore, the tension pressure can be set by the hydraulic pump, and a specific tension pressure can be achieved by injecting a specific volume of liquid into the hydraulic telescopic cylinder through the hydraulic pump.

[0049] Furthermore, such as Figure 3 and Figure 4 As shown, in one embodiment, the clamping member 20 is a clamping ring, which is sleeved on the tensioning 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 relative to each other. The clamping member 20 is a clamping ring, both of which are sleeved on the tensioning member 10. The tensioning member 10 is provided with a shoulder 12. Therefore, by having the inner telescopic ring 31 abut against the shoulder 12 and the outer telescopic ring 32 abut against the clamping ring, the tensioning member 10 and the clamping member 20 can be moved relative to each other, effectively improving the ease of use of the tensioning device 100.

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

[0051] In this specific embodiment, such as 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 abuts against one end face and the outer peripheral surface of the outer telescopic ring 32, respectively. The second fixing ring 52 is sleeved on the outer telescopic ring 32 and abuts against the other end face and the outer peripheral surface of the outer telescopic ring 32, respectively. The tensioning member 10 and the inner telescopic ring 31 can move through the first fixing ring 51, and the clamping member 20 can move through the second fixing ring 52. The fixing assembly 50 is used to limit the axial and radial positions of the telescopic ring, and the interconnected first fixing ring 51 and the second fixing ring 52 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. 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 component 50 and the replacement of the telescopic component 30.

[0053] Furthermore, such as 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 and connected to the clamping ring. The protective sleeve 60 is connected to the clamping ring, and in use, one end is sleeved on the clamping ring and the other end is sleeved on the threaded element 82, to prevent interference between other components of the tensioning device 100 and the threaded element 82.

[0054] In this specific embodiment, such as 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 modular screw 80, and the other end of the locking stud 811 can be connected to the tensioning member 10. The locking nut 812 is threadedly connected to the locking stud 811 and abuts against the threaded element 82. The pressure ring and the protective sleeve 60 are respectively provided with a first operating hole 21 and a second operating hole 61. 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 pressure ring and the protective sleeve 60 are respectively provided with a first operating hole 21 and a second operating hole 61. 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, finally realizing the tensioning of the modular screw 80.

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

[0056] Specifically, such as Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, the fixing component 50 is provided with a lifting ring 70. The fixing component 50 is provided with a mounting plate, and the two ends of the mounting plate are respectively connected to the first fixing ring 51 and the second fixing ring 52. The lifting ring 70 is provided with a bolt connection part, which is threadedly connected to the mounting plate through the bolt connection part. The lifting ring 70 is used to suspend or store the tensioning device 100, and the threaded connection part makes the lifting ring 70 easy to install and remove.

[0057] like Figure 7As shown, in one embodiment, a method for tensioning a modular screw 80 is provided, using the aforementioned tensioning device 100, including the following specific steps:

[0058] S10: Multiple threaded elements 82 are sequentially fitted onto the shaft core 83 of the modular screw 80, and a locking member 81 is installed on the end face of the shaft core 83 so that the locking member 81 abuts against the end face of the threaded element 82.

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

[0060] S30: Connect the clamping part 20 of the tensioning device 100 to the threaded element 82;

[0061] S40: The extension of the telescopic member 30 of the tensioning device 100 is controlled by the drive member 40;

[0062] S50: The extension member 30 is kept in the extended state by the drive member 40, and the locking member 81 is operated to make it abut against the end face of the threaded element 82 again.

[0063] Specifically, such as 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 seal the gap between the shaft core 83 and the threaded element 82 to prevent the plastic melt from entering the gap when the modular screw 80 is working.

[0064] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and 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. Therefore, they should not be construed as limitations on this invention.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0069] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A tensioning device for a modular screw, characterized in that, include: A tension member (10) is used to connect with a locking member (81) of a modular screw (80); A clamping element (20) is used to abut against the threaded element (82) of the modular screw (80); Telescopic member (30), one end of which abuts against the tension member (10), and the other end of which abuts against the clamping member (20); A driving component (40) is connected to the telescopic component (30) and is used to drive the telescopic component (30) to extend and retract. The telescopic member (30) includes an inner telescopic ring (31) sleeved on the tension member (10) and an outer telescopic ring (32) sleeved on the inner telescopic ring (31). The tension member (10) has a shoulder (12) at one end away from the locking member (81). The inner telescopic ring (31) abuts against the shoulder (12), and the outer telescopic ring (32) abuts against the pressing member (20). The clamping member (20) is a clamping ring, which is sleeved on the tensioning 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 face of the threaded element (82). The tensioning device further includes a fixing component (50), which is sleeved on the outer telescopic ring (32) and abuts against both ends of the outer telescopic ring (32); The fixing component (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 abuts against one end face and the outer peripheral surface of the outer telescopic ring (32) respectively. The second fixing ring (52) is sleeved on the outer telescopic ring (32) and abuts against the other end face and the outer peripheral surface of the outer telescopic ring (32) respectively. The tensioning member (10) and the inner telescopic ring (31) can move through the first fixing ring (51), and the clamping member (20) can move through the second fixing ring (52). The tensioning device further includes a protective sleeve (60), which is sleeved on the clamping ring and connected to the clamping ring; the protective sleeve (60) and the clamping ring are connected by screws, which pass through the outer wall of the protective sleeve (60) and the clamping ring in sequence. The clamping ring and the protective sleeve (60) are respectively provided with a first operating hole (21) and a second operating hole (61), and the first operating hole (21) and the second operating hole (61) are used to operate the locking member (81).

2. The tensioning device for a modular screw according to claim 1, characterized in that, The tension 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 is threadedly connected to the tension member (10).

3. A tensioning device for a modular screw according to claim 1, 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 (83) of the modular 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). The first operating hole (21) and the second operating hole (61) are used to rotate the nut.

4. A tensioning device for a modular screw according to claim 1, characterized in that, The fixing component (50) is provided with a lifting ring (70).

5. A method for tensioning a modular screw, characterized in that, Using the tensioning device according to any one of claims 1-4 includes the following specific steps: S10: Multiple threaded elements (82) are sequentially fitted onto the shaft core (83) of the modular screw (80), and a locking member (81) is installed on the end face of the shaft core (83) so that the locking member (81) abuts against the end face of the threaded element (82); S20: Connect the tensioning member (10) of the tensioning device to the locking member (81); S30: The clamping part (20) of the tensioning device abuts against the threaded element (82); S40: The extension of the telescopic component (30) of the tensioning device is controlled by the drive component (40); S50: The extension member (30) is kept in an extended state by the drive member (40), and the locking member (81) is operated to make it abut against the end face of the threaded element (82) again.

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