A pre-tensioning device for a sliding door guide block

Abstract

The application relates to the field of pre-tightening tools, in particular to a pre-tightening device for a sliding door guide block. The device comprises an outer cylinder, a pawl seat, a plurality of rotation limiting assemblies and a bolt sleeve, the outer cylinder has an accommodating cavity in the inner part; the pawl seat is arranged in the accommodating cavity and fixedly connected with the outer cylinder; the plurality of rotation limiting assemblies are arranged in the circumferential direction of the pawl seat at intervals and can stretch and contract in the radial direction of the pawl seat; one end of the bolt sleeve is used for clamping with a bolt, the other end is sleeved outside the pawl seat and rotationally connected with the outer cylinder, the inner wall of the bolt sleeve is circumferentially provided with arc-shaped grooves corresponding to the rotation limiting assemblies one by one, and each arc-shaped groove comprises an inclined surface inclined to the pawl seat and a radial extending abutting surface. Through the arc-shaped grooves, the rotation limiting assemblies can only rotate in one direction, thereby solving the problem that the positive and negative torques cannot be differentially output; the torque required for pre-tightening the guide block bolt can be determined by arranging the rotation limiting assemblies, thereby guaranteeing the pre-tightening effect of the guide block bolt.

Description

Technical Field

[0001] This invention relates to the field of pre-tightening fixtures, and more specifically to a pre-tightening device for a sliding door guide block. Background Technology

[0002] The assembly process of the adaptive guide block for sliding doors (usually fixed to the B-pillar of the side panel) involves an adaptive process. Before adjusting the gap difference of the sliding door, the guide block fixing bolts are tightened to a pre-tightened state (during the door adjustment process, the guide block can adaptively move with the sliding door, but will not be affected by its own weight). After the sliding door is positioned, the guide block bolts are tightened to lock its position.

[0003] There are currently two common methods for tightening the guide block fixing bolts to the pre-tightened state: one is to manually tighten the bolts to the pre-tightened state using traditional tightening tools; the other is to use a torque electric gun to assemble them to the pre-tightened state.

[0004] However, both of these methods have shortcomings: manually tightening the bolts is inefficient and the pre-tightening effect is difficult to guarantee; the torque value of the torque-controlled electric gun is difficult to reach the low torque range of the guide block bolt pre-tightening state (generally 0.4Nm ~ 0.7Nm), and it cannot provide a large reverse torque. The forward and reverse torques cannot be set differently, which is not suitable for the different torque requirements of the sliding door guide block adjustment steps. When the bolt torque is too large, it is necessary to loosen it first with other tools. Therefore, both of these methods will ultimately affect the positioning effect of the guide block on the sliding door, increasing the probability of abnormal noise from the sliding door. Summary of the Invention

[0005] In view of the deficiencies in the existing technology, the purpose of the present invention is to provide a pre-tightening device for sliding door guide blocks, which can solve the problem that the positive and negative torques cannot be differentiated when pre-tightening sliding door guide blocks in the existing technology, resulting in inconvenience in the installation and disassembly of the guide blocks.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] This application provides a pre-tightening device for a sliding door guide block, comprising:

[0008] The outer cylinder has an internal cavity for receiving the contents;

[0009] A ratchet seat is provided in the aforementioned receiving cavity and is fixedly connected to the aforementioned outer cylinder;

[0010] Multiple rotation limit components are arranged circumferentially around the pawl seat and can extend and retract radially along the pawl seat.

[0011] A bolt sleeve has one end for engaging with a guide block bolt, and the other end is sleeved on the outside of the pawl seat and rotatably connected to the outer cylinder. The inner wall of the bolt sleeve is provided with arc-shaped grooves corresponding to the rotation limiting components. Each arc-shaped groove includes an inclined surface that slopes towards the pawl seat and a radially extending abutting surface. When the outer cylinder is rotated in the forward direction, the bolt sleeve rotates with the outer cylinder, causing the rotation limiting components to be compressed within the arc-shaped grooves until the rotational torque exceeds a set value. At this point, the rotation limiting components slide along the inclined surface of the arc-shaped grooves to an adjacent arc-shaped groove, and the outer cylinder rotates relative to the bolt sleeve. When the outer cylinder is rotated in the reverse direction, the rotation limiting components abut against the abutting surface.

[0012] In some optional embodiments, the rotation limiting component described above includes:

[0013] Telescopic arms are provided circumferentially along the pawl seats and can extend and retract radially along the pawl seats.

[0014] A pawl is located between two adjacent telescopic arms. One end of the pawl is rotatably connected to the pawl seat. When the outer cylinder rotates in the forward direction, the pawl presses against the corresponding telescopic arm. When the outer cylinder rotates in the reverse direction, the other end of the pawl abuts against the abutting surface of the arc-shaped groove.

[0015] In some optional embodiments, the ratchet seat has multiple guide holes radially provided, and the telescopic arm includes:

[0016] A retaining element, which passes through the aforementioned guide hole;

[0017] An elastic element, which abuts against the aforementioned abutment, is used to provide elastic restoring force to the aforementioned abutment.

[0018] In some optional embodiments, the guide hole is a stepped hole, the abutment includes an abutment section and a limiting section, the abutment section extends out from the small diameter hole of the stepped hole and abuts against the pawl, the limiting section is located in the large diameter hole of the stepped hole, and one end abuts against the elastic member, and the other end abuts against the bottom wall of the stepped hole.

[0019] In some alternative embodiments, an adjustment component is also included, which abuts against the other end of the elastic member away from the abutment member, for adjusting the preload of the elastic member.

[0020] In some alternative embodiments, the adjustment assembly includes a clamping shaft with a tapered clamping end that abuts against the end of the elastic member away from the abutment member, and the clamping shaft is axially movable along the pawl seat.

[0021] In some alternative embodiments, the bolt sleeve has a through hole at its axial center for the clamping shaft to pass through, and the other end of each elastic element is connected to a retaining block. All the retaining blocks are located in the through hole and abut against the clamping shaft.

[0022] In some optional embodiments, the inner wall of the outer cylinder is provided with threads, and the aforementioned adjustment...

[0023] The assembly also includes an adjusting nut, which is rotatably connected to the adjusting end of the clamping shaft and threadedly engaged with the inner wall of the outer cylinder, so that when the adjusting nut rotates relative to the outer cylinder, the adjusting nut pushes the clamping shaft to move axially along the outer cylinder.

[0024] In some optional embodiments, a plurality of first grooves are provided circumferentially on the inner wall of the outer cylinder, and a plurality of second grooves corresponding to the first grooves are provided circumferentially on the outer wall of the pawl seat, and each of the first grooves and the second grooves are engaged by a positioning member.

[0025] In some optional embodiments, the outer wall of the bolt sleeve is provided with a first annular groove, and the inner wall of the outer cylinder is provided with a corresponding second annular groove. The first annular groove and the second annular groove are connected by ball bearings so that the outer cylinder can rotate relative to the bolt sleeve.

[0026] The beneficial effects of the technical solutions provided in this application include:

[0027] The arc-shaped groove allows the rotation limit component to rotate only in one direction, thus enabling the guide block bolts to be pre-tightened within a set torque range. When the outer cylinder rotates in the opposite direction to loosen the guide block bolts, sufficient torque can be applied to overcome static friction and loosen the guide block bolts, solving the problem of inconsistent output of forward and reverse torques. By setting the rotation limit component to be compressed to allow the required external force to pass through the gap, the torque required to pre-tighten the guide block bolts can be determined, thereby ensuring the pre-tightening effect of the guide block bolts and improving the pre-tightening qualification rate of the guide block bolts. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a side view of a pre-tightening device for a sliding door guide block according to this application;

[0030] Figure 2 for Figure 1 A schematic cross-sectional view along the axial direction;

[0031] Figure 3 for Figure 2 A cross-sectional schematic diagram of BB;

[0032] Figure 4 for Figure 3 A schematic diagram of the central rotation limiting component in the tightened and loosened states;

[0033] Figure 5 An exploded view of the adjustment components;

[0034] Figure 6 for Figure 1 A schematic diagram of the structure in direction A;

[0035] Figure 7 This is an exploded diagram of the ratchet seat and bolt sleeve.

[0036] Figure 8 This is a schematic diagram of the outer cylinder structure.

[0037] In the diagram: 1. Pawl seat; 11. Guide hole; 12. Body; 13. Cover; 2. Rotation limit assembly; 21. Telescopic arm; 211. Supporting part; 212. Elastic part; 213. Supporting block; 22. Pawl; 3. Adjustment assembly; 31. Pressing shaft; 311. Pressing end; 312. Adjusting end; 32. Adjusting nut; 4. Bolt sleeve; 41. Arc groove; 411. Inclined surface; 412. Supporting surface; 42. First annular groove; 43. Clamping part; 5. Outer cylinder; 51. Ball; 52. Grip part; 53. Scale line; 54. First groove; 6. Positioning part; 7. First limiting ball; 8. Bolt. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0039] This application provides a pre-tightening device for a sliding door guide block, which ensures that the sliding door guide block is pre-tightened to the required torque, achieving a good pre-tightening effect. It also solves the technical problem that the positive and negative torques cannot be differentiated when pre-tightening the guide block bolts, which leads to inconvenience in the installation and disassembly of the guide block bolts. The following is a detailed description in conjunction with the accompanying drawings and embodiments.

[0040] Specifically, such as Figure 1 and Figure 2 As shown, a pre-tightening device for a sliding door guide block includes an outer cylinder 5, a ratchet seat 1, multiple rotation limit components 2, and a bolt sleeve 4. Rotating the outer cylinder 5 can drive the bolt sleeve 4 to rotate together to tighten or loosen the guide block bolt. When tightening the guide block bolt, if the rotational torque is greater than a set value, the outer cylinder 5 will no longer drive the bolt sleeve 4 to rotate together. When loosening the guide block bolt, the outer cylinder 5 will continuously drive the bolt sleeve 4 to rotate together.

[0041] Specifically, the outer cylinder 5 has a receiving cavity; the pawl seat 1 is disposed in the receiving cavity and fixedly connected to the outer cylinder 5; a plurality of rotation limiting components 2 are spaced apart circumferentially along the pawl seat 1 and can extend and retract radially along the pawl seat 1; one end of the bolt sleeve 4 is used to engage with the bolt, and the other end is sleeved on the outside of the pawl seat 1 and rotatably connected to the outer cylinder 5; the inner wall of the bolt sleeve 4 is provided with arc-shaped grooves 41 corresponding one-to-one with the rotation limiting components 2, and each arc-shaped groove 41 includes a groove extending towards the pawl seat 1. The inclined surface 411 and the radially extending abutting surface 412 are used to compress the rotation limiting component 2 in the arc groove 41 when the outer cylinder 5 is rotated in the forward direction, so that the bolt sleeve 4 rotates together with the outer cylinder 5 until the rotation torque exceeds the set value. Then, the rotation limiting component 2 slides along the inclined surface 411 of the arc groove 41 to the adjacent arc groove 41, and the outer cylinder 5 and the bolt sleeve 4 rotate relative to each other. When the outer cylinder 5 is rotated in the reverse direction, the rotation limiting component 2 abuts against the abutting surface 412.

[0042] In other words, the arc-shaped groove 41 allows the rotation limiting component 2 to rotate only in one direction. During rotation, the inclined surface 411 of the arc-shaped groove 41 compresses the rotation limiting component 2. When the rotational torque exceeds the set value, the rotation limiting component 2 is compressed to the point that it can move from one arc-shaped groove 41 to an adjacent arc-shaped groove 41, causing relative rotation between the outer cylinder 5 and the bolt sleeve 4. Therefore, no matter how the outer cylinder 5 rotates, the guide block bolt will not be tightened further, achieving pre-tightening of the guide block bolt within the set torque range. When the outer cylinder 5 rotates in the opposite direction to loosen the guide block bolt, the rotation limiting component 2 abuts against the abutment surface 412, keeping the outer cylinder 5 and the bolt sleeve 4 in a fixed relative position. This provides sufficient torque to the guide block bolt to overcome static friction and loosen the guide block bolt. This achieves differentiated torque output in both directions, i.e., unidirectional constant torque.

[0043] In this example, the inclined surface 411 of an arc groove 41 intersects with the abutting surface 412 of an adjacent arc groove 41, and the junction has a gap with the outer wall of the pawl seat 1 so that the rotation limiting assembly 2 can pass through the gap after being compressed.

[0044] By setting the rotation limit component 2 to be compressed to allow the required external force to pass through the gap, the torque required to pre-tighten the guide block bolt can be determined, thereby ensuring the pre-tightening effect of the guide block bolt and improving the pre-tightening qualification rate of the guide block bolt. When the pre-installed torque of the guide block bolt in the previous process exceeds the pre-tightening torque, the pre-tightening device of this application can be used to first rotate in the disassembly direction to loosen the guide block bolt and then tighten it in the tightening direction to the preset torque, without the need for other disassembly tools, thus improving the assembly cycle.

[0045] In some alternative embodiments, such as Figure 3 and Figure 4 As shown, the rotation limiting assembly 2 includes a telescopic arm 21 and a pawl 22. The telescopic arms 21 are spaced apart circumferentially along the pawl seat 1 and can extend and retract radially along the pawl seat 1; the pawl 22 is located between two adjacent telescopic arms 21, and one end of the pawl 22 is rotatably connected to the pawl seat 1. When the outer cylinder 5 rotates in the forward direction, the pawl 22 presses against the corresponding telescopic arm 21. When the outer cylinder 5 rotates in the reverse direction, the other end of the pawl 22 abuts against the abutting surface 412 of the arc-shaped groove 41.

[0046] It is understandable that by setting the pawl 22, a buffer can be provided for the compression and extension of the telescopic arm 21. When the outer cylinder 5 is rotated in the opposite direction, the pawl 22 abuts against the abutting surface 412. The larger torque of the reverse rotation is decomposed and transmitted to the pawl seat 1 through the pawl 22. Compared with not setting the pawl 22 and abutting the telescopic arm 21 against the abutting surface 412, the torque of the reverse rotation is more likely to cause deformation of the telescopic arm 21.

[0047] In this example, the pawl 22 is preferably an arc shape that matches the inclined surface 411 of the arc groove 41. When the pawl 22 is arc-shaped and the telescopic arm 21 is located between the pawl 22 and the pawl seat 1, the arc groove 41 can also be a rectangular groove. Therefore, by setting an arc-shaped pawl 22 with one end rotatably connected to the pawl seat 1 and cooperating with the abutting surface on the side of the opening direction of the pawl 22 and the pawl seat 1, unidirectional rotation of the pawl 22 and the telescopic arm 21 can be achieved.

[0048] Preferably, the ends of the telescopic arm 21 that abut against the pawl 22 are rounded to reduce sliding friction.

[0049] In some optional embodiments, the pawl seat 1 has a plurality of guide holes 11 in the radial direction, and the telescopic arm 21 includes a retaining member 211 and an elastic member 212. The retaining member 211 passes through the guide holes 11; the elastic member 212 abuts against the retaining member 211 and is used to provide elastic restoring force to the retaining member 211.

[0050] Optionally, the telescopic arm 21 can be a hydraulic telescopic rod, a pneumatic spring, or other telescopic component. In this example, the telescopic arm 21 is configured to provide elastic restoring force to the supporting component 211 via the elastic element 212. The preload of the elastic element 212 can be adjusted by changing the spring with a different elastic coefficient or by changing the effective telescopic length of the spring, thereby adjusting the magnitude of the preload torque on the guide block bolt.

[0051] In some optional embodiments, the guide hole 11 is a stepped hole, the abutment 211 includes an abutment section and a limiting section, the abutment section extends out from the small diameter hole of the stepped hole and abuts against the pawl 22, the limiting section is located in the large diameter hole of the stepped hole, and one end abuts against the elastic member 212, and the other end abuts against the bottom wall of the stepped hole.

[0052] It is understandable that setting the guide hole 11 as a stepped hole can prevent the elastic member 212 from completely pushing out the abutment member 211. The stepped hole limits the maximum range of the elongation of the elastic member 212 in the direction of the arc groove 41.

[0053] Preferably, the elastic element 212 is located inside the large-diameter hole of the stepped hole, and its diameter matches the diameter of the large-diameter hole. The purpose of this arrangement is to prevent the elastic element 212 from bending laterally during expansion and contraction, which could cause errors in the torque applied to the pre-tightening of the guide block bolts.

[0054] In some optional embodiments, the pretensioning device further includes an adjustment component 3, which abuts against the other end of the elastic member 212 away from the abutment member 211, for adjusting the pretensioning force of the elastic member 212.

[0055] In other words, this application adjusts the preload of the elastic element 212 by adjusting the effective extension length of the elastic element 212 through the adjusting component 3.

[0056] Furthermore, such as Figure 5 As shown, the adjustment assembly 3 includes a clamping shaft 31, the clamping end 311 of the clamping shaft 31 is a cone and abuts against the end of the elastic member 212 away from the abutment member 211, and the clamping shaft 31 can move along the axial direction of the pawl seat 1.

[0057] It is understandable that since the pressing end 311 of the pressing shaft 31 is a cone, it has an inclined surface in the axial direction. When the pressing end 311 abuts against the elastic element 212 at different positions, the resisting force on the elastic element 212 is different.

[0058] Therefore, the rate of change of the preload of the elastic element 212 can be controlled by setting the tilt angle of the vertebral body's sidewall relative to the axial direction. The greater the tilt angle of the vertebral body's sidewall relative to the axial direction, the greater the change in the preload of the elastic element 212 when the pressing shaft 31 moves a unit distance towards the elastic element 212.

[0059] In some alternative embodiments, the bolt sleeve 4 is provided with a through hole at the center for the clamping shaft 31 to pass through, and the other end of each elastic element 212 is connected to a retaining block 213. All the retaining blocks 213 are located in the through hole and abut against the clamping shaft 31.

[0060] In this example, one end of the abutment block 213 is inserted into the elastic member 212, and the other end is located in the through hole. The abutment blocks 213 of all elastic members 212 are arranged around the through hole. When the clamping shaft 31 moves toward the through hole and passes through the through hole, all the abutment blocks 213 are simultaneously abutted, so that the preload of all elastic members 212 is adjusted at the same time.

[0061] In some optional embodiments, the inner wall of the outer cylinder 5 is provided with threads, and the adjustment assembly 3 further includes an adjustment nut 32, which is rotatably connected to the adjustment end 312 of the clamping shaft 31 and threadedly engaged with the inner wall of the outer cylinder 5, so that when the adjustment nut 32 rotates relative to the outer cylinder 5, the adjustment nut 32 pushes the clamping shaft 31 to move axially along the outer cylinder 5.

[0062] In this example, the adjusting end 312 of the clamping shaft 31 is cylindrical and adapted to the shape of the adjusting nut 32. Annular first limiting grooves are respectively provided on the adjusting nut 32 and the adjusting end 312. When the adjusting nut 32 and the adjusting end 312 are installed, the openings of the two first limiting grooves face each other and are joined to form an annular slide rail with a circular cross-section. The first limiting ball 7 moves within the annular slide rail, so that when the adjusting nut 32 rotates, the clamping shaft 31 will not rotate with the adjusting nut 32 under the action of the first limiting ball 7, but can move along the axis of the outer cylinder 5 with the adjusting nut 32.

[0063] By rotating the adjusting nut 32, it moves along the axis of the outer cylinder 5, thereby pushing the clamping shaft 31 to adjust the preload of the guide block bolt. Therefore, the torque can be adjusted by setting the rotation angle of the adjusting nut 32.

[0064] In this example, a rotating handle is provided on the side wall of the adjusting nut 32 away from the adjusting end 312 to facilitate rotating the adjusting nut 32.

[0065] Preferred, such as Figure 6As shown, at the end of the outer cylinder 5 near the adjusting nut 32, the outer wall parallel to the side wall where the adjusting nut 32 has a rotating handle has circumferential scale lines 53, and corresponding arrows are provided on the adjusting nut 32. This allows for intuitive reading of the different rotation angles of the adjusting nut 32, corresponding to the preload of the bolt sleeve 4 on the guide block bolt. The correspondence between the rotation angle of the adjusting nut 32 and the preload can be measured using a torque calibration tool and marked on the scale lines. Thus, in practical applications, when the preload of the preload device deviates and needs calibration, or when the preload device needs to output different preloads for different parts, the adjusting nut can be rotated to adjust the preload torque output by the preload device without disassembling or replacing it, improving the convenience and versatility of the preload device.

[0066] In some alternative embodiments, such as Figure 7 and Figure 8 As shown, a plurality of first grooves 54 are provided circumferentially on the inner wall of the outer cylinder 5, and a plurality of second grooves corresponding to the first grooves 54 are provided circumferentially on the outer wall of the pawl seat 1. Each of the first grooves 54 and the second grooves are engaged by a positioning member 6.

[0067] In this example, the pawl seat 1 includes a body 12 and a cover 13. The rotation limiting component 2 is disposed on the body 12. The cover 13 and the body 12 are provided with multiple arc-shaped grooves at intervals on the side wall near the outer cylinder 5. When the cover 13 and the body 12 are connected together by bolts 8, the arc-shaped grooves on the cover 13 and the body 12 are spliced ​​to form the aforementioned semi-circular second groove. Correspondingly, on the inner wall of the outer cylinder 5, multiple semi-circular first grooves 54 corresponding to the aforementioned second groove are circumferentially spaced. The first grooves 54 and the second grooves are spliced ​​to form a receiving space for accommodating the spherical positioning component 6.

[0068] During assembly, the main body 12 can be placed in the receiving cavity of the outer cylinder 5 and the position of the arc groove corresponds to the position of the first groove 54. Then, the positioning piece 6 is placed in the arc groove and the first groove 54. The arc groove of the cover 13 is then matched with the positioning piece 6 and connected to the main body 12 by bolts 8, so that the pawl seat 1 can maintain a fixed relative position to the outer cylinder 5.

[0069] The purpose of this design is to avoid installing bolts from the outer cylinder 5 to fix it to the ratchet seat 1, thus improving the aesthetics.

[0070] In some optional embodiments, the outer wall of the bolt sleeve 4 is provided with a first annular groove 42, and the inner wall of the outer cylinder 5 is provided with a corresponding second annular groove. The first annular groove 42 and the second annular groove are connected by ball bearings 51 so that the outer cylinder 5 can rotate relative to the bolt sleeve 4.

[0071] In some optional embodiments, a gripping portion 52 is provided on the outer side wall of the outer cylinder 5, and a plurality of axially extending grooves are provided on the gripping portion 52 at intervals along the circumference to increase the friction force when gripping and rotating.

[0072] In some optional embodiments, one end of the bolt sleeve 4 is provided with a retaining part 43 extending axially. The retaining part 43 has a bolt hole for engaging with the guide block bolt. The retaining part 43 can be inserted into a small space to tighten or loosen the guide block bolt.

[0073] Compared to traditional wrenches, the axially positioned locking part makes operation more convenient.

[0074] The working principle of this embodiment is as follows: When the guide block bolt needs to be pre-tightened, first rotate the adjusting nut 32 to the scale corresponding to the required torque, then engage the clamping part of the bolt sleeve 4 with the guide block bolt, hold the clamping part 52 of the outer cylinder 5, and rotate the outer cylinder 5 in the forward direction. At this time, the pawl 22, under the support of the arc groove 41, presses down on the telescopic arm 21, which is in state A in the figure. During the downward pressing of the telescopic arm 21, the bolt sleeve 4 rotates together with the outer cylinder 5 and continuously tightens the guide block bolt. When a "click" sound is heard, it indicates that the pawl 22 and the telescopic arm 21 have rotated from one arc groove 41 to an adjacent arc groove 41. At this time, rotating the outer cylinder 5, the bolt sleeve 4 no longer rotates with the outer cylinder 5, and the pre-tightening of the guide block bolt is completed. When the guide block bolt needs to be loosened, rotate the outer cylinder 5 in the reverse direction. At this time, the pawl 22 is in state B in the figure. Continuously rotating the outer cylinder 5 in the reverse direction can loosen the guide block bolt.

[0075] This invention provides a pre-tightening device for a sliding door guide block. Through an arc-shaped groove 41, the rotation limiting component 2 can only rotate in one direction, thus enabling the guide block bolts to be pre-tightened within a set torque range. When the outer cylinder 5 rotates in the opposite direction, loosening the guide block bolts, sufficient torque is provided to overcome static friction and loosen the bolts, solving the problem of inconsistent torque output in both directions. By setting the rotation limiting component 2 to be compressed to allow the required external force to pass through the gap, the torque required to pre-tighten the guide block bolts can be determined, ensuring the pre-tightening effect and improving the pre-tightening qualification rate. The pawl 22 provides buffering for the compression and extension of the telescopic arm 21. When the outer cylinder 5 rotates in the opposite direction, the pawl 22 abuts against the abutment surface 412, preventing deformation of the telescopic arm 21 when it abuts against the abutment surface 412. The device can be adjusted by... The effective extension length of the elastic element 212 is adjusted by component 3, thereby adjusting the preload of the elastic element 212. By setting the adjusting nut 32, it is moved along the axis of the outer cylinder 5, thereby pushing the clamping shaft 31 to adjust the preload of the guide block bolt. Therefore, the torque can be adjusted by setting the rotation angle of the adjusting nut 32. By connecting the outer cylinder 5 and the pawl seat 1 together with the positioning component 6 through the spaced grooves, it is not necessary to install bolts on the outer cylinder 5 to fix it to the pawl seat 1, which improves the aesthetics. By setting the scale line 53 on the outer wall of the outer cylinder 5 near the end of the adjusting nut 32, which is parallel to the side wall of the adjusting nut 32 with the rotating handle, the adjusting nut can be rotated in time to adjust the preload torque output by the preload device without disassembling or replacing the preload device, which improves the convenience and versatility of the preload device and improves the assembly efficiency.

[0076] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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 between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0077] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0078] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A pre-tightening device for a guide block of a sliding door, characterized in that, include: The outer cylinder (5) has an internal cavity; A pawl seat (1) is disposed in the receiving cavity and fixedly connected to the outer cylinder (5); Multiple rotation limiting components (2) are arranged circumferentially along the pawl seat (1) and can extend and retract radially along the pawl seat (1); A bolt sleeve (4) has one end for engaging with a guide block bolt, and the other end is fitted over the ratchet seat (1) and rotatably connected to the outer cylinder (5). The inner wall of the bolt sleeve (4) is provided with arc-shaped grooves (41) corresponding one-to-one with the rotation limiting assembly (2). Each arc-shaped groove (41) includes an inclined surface (411) tilted towards the ratchet seat (1) and a radially extending abutting surface (412), used to prevent the bolt from engaging when the outer cylinder (5) is rotated in the forward direction. The sleeve (4) rotates together with the outer cylinder (5) to compress the rotation limiting component (2) in the arc groove (41) until the rotation torque exceeds the set value. Then the rotation limiting component (2) slides along the inclined surface (411) of the arc groove (41) to the adjacent arc groove (41). The outer cylinder (5) and the bolt sleeve (4) rotate relative to each other. When the outer cylinder (5) is rotated in the opposite direction, the rotation limiting component (2) abuts against the abutting surface (412). The rotation limiting assembly (2) includes: Telescopic arms (21) are arranged circumferentially along the pawl seat (1) and can extend and retract radially along the pawl seat (1); A pawl (22) is located between two adjacent telescopic arms (21). One end of the pawl (22) is rotatably connected to the pawl seat (1). When the outer cylinder (5) rotates in the forward direction, the pawl (22) presses against the corresponding telescopic arm (21). When the outer cylinder (5) rotates in the reverse direction, the other end of the pawl (22) abuts against the abutting surface (412) of the arc groove (41).

2. The pre-tightening device as described in claim 1, characterized in that, The ratchet seat (1) has multiple guide holes (11) opened radially, and the telescopic arm (21) includes: A retaining member (211) is inserted into the guide hole (11); An elastic element (212) abuts against the abutting element (211) and is used to provide elastic restoring force to the abutting element (211).

3. The pre-tightening device as described in claim 2, characterized in that, The guide hole (11) is a stepped hole. The abutment (211) includes an abutment section and a limiting section. The abutment section extends out from the small diameter hole of the stepped hole and abuts against the pawl (22). The limiting section is located in the large diameter hole of the stepped hole, and one end abuts against the elastic member (212), and the other end abuts against the bottom wall of the stepped hole.

4. The pre-tightening device as described in claim 2, characterized in that, It also includes an adjustment component (3) that abuts against the other end of the elastic member (212) away from the abutment member (211) for adjusting the preload of the elastic member (212).

5. The pre-tightening device as described in claim 4, characterized in that, The adjustment assembly (3) includes a clamping shaft (31), the clamping end (311) of which is conical and abuts against the end of the elastic member (212) away from the abutment member (211). The clamping shaft (31) can move axially along the pawl seat (1).

6. The pre-tightening device as described in claim 5, characterized in that, The bolt sleeve (4) has a through hole at its axial center for the clamping shaft (31) to pass through. Each elastic element (212) has a retaining block (213) connected to its other end. All retaining blocks (213) are located in the through hole and abut against the clamping shaft (31).

7. The pre-tightening device as described in claim 5, characterized in that, The inner wall of the outer cylinder (5) is threaded. The adjustment assembly (3) also includes an adjustment nut (32), which is rotatably connected to the adjustment end (312) of the clamping shaft (31) and threadedly engaged with the inner wall of the outer cylinder (5). When the adjustment nut (32) rotates relative to the outer cylinder (5), the adjustment nut (32) pushes the clamping shaft (31) to move axially along the outer cylinder (5).

8. The pre-tightening device as described in claim 1, characterized in that, On the inner wall of the outer cylinder (5), a plurality of first grooves are provided at intervals along the circumference, and on the outer wall of the pawl seat (1), a plurality of second grooves corresponding to the first grooves are provided at intervals along the circumference. Each first groove and the second groove are engaged by a positioning member (6).

9. The pre-tightening device as described in claim 1, characterized in that, The outer wall of the bolt sleeve (4) is provided with a first annular groove (42) and the inner wall of the outer cylinder (5) is provided with a second annular groove. The first annular groove (42) and the second annular groove are connected by a ball bearing (51) so that the outer cylinder (5) can rotate relative to the bolt sleeve (4).

Images