B-pillar inner panel assembly assembly positioning fixture

Abstract

The application provides a B column inner plate assembly positioning clamp, and belongs to the technical field of automobile B column inner plate assembly processing. The B column inner plate assembly positioning clamp is a transverse bent beam assembly positioning tool, which comprises a mounting seat with a mounting groove and a pressing positioning assembly. The mounting seat is used for placing the ear plate of the transverse bent beam. The pressing positioning assembly is composed of a stand, a first core column, a second core column and a pair of symmetrical V-shaped rubber plates. The bottom end of the core column is provided with a coaxial reduced-diameter positioning pin and a positioning table surface. The bottom end of the positioning pin is a conical surface, which can be slidably inserted into the through hole of the ear plate, and the positioning table surface is positioned against the top end of the through hole. When the stand moves downward, the rubber plate is attached to the inner side wall of the groove of the ear plate, cooperates with the positioning structure of the core column, realizes the accurate fixing and positioning of the ear plate in the mounting seat, and guarantees the assembly precision of the transverse bent beam. The B column inner plate assembly positioning clamp can quickly and reliably accurately position the transverse bent beam, so as to be assembled with the longitudinal beam.

Description

Technical Field

[0001] This invention relates to the field of automotive B-pillar inner panel processing technology, and more specifically, to a B-pillar inner panel assembly positioning fixture. Background Technology

[0002] The B-pillar inner panel assembly is a key load-bearing safety component on the side of the vehicle body. It is mainly composed of horizontal and vertical beams that are connected and assembled. The assembly precision of the two directly determines the overall structural strength, dimensional accuracy, and body assembly matching of the B-pillar. Among them, the assembly process of connecting the horizontal and vertical beams through the figure-eight interface is the core and key process of the assembly processing.

[0003] Currently, during assembly, clamps are mainly used to hold the two ends of the transverse curved beam, or the beam segment near the center, moving it to the corresponding workstation and maintaining a fixed posture. Then, a robotic arm holds the longitudinal beam and moves it to the figure-eight interface with the transverse curved beam for assembly. The most difficult part to clamp and position is the transverse curved beam, due to its unique structure and irregular shape. Conventional clamps easily touch a series of structural features on the transverse curved beam, causing clamping obstruction and easily damaging various holes or protrusions on the body, which are key structural features for assembly, affecting the subsequent assembly of the B-pillar inner panel assembly. During the clamping process of the transverse curved beam, because it is an irregular curved strip structure with flanges in the width direction, it is difficult to clamp tightly. It is easy to squeeze and loosen or over-clamp and deform, which ultimately leads to the misalignment of the figure-eight interface of the transverse curved beam, making it difficult to accurately align with the longitudinal beam.

[0004] Therefore, the existing B-pillar inner panel assembly positioning fixture has problems such as rigid clamping of easily damaged workpieces, easy deformation, and poor positioning accuracy, which makes it difficult to meet the needs of high-precision and high-efficiency modern automotive parts production. Therefore, it is urgent to design a new type of B-pillar inner panel assembly positioning fixture to solve the above-mentioned technical defects. Summary of the Invention

[0005] This invention provides a positioning fixture for B-pillar inner panel assembly assembly, which can effectively solve the problem that conventional tooling is difficult to accurately and reliably clamp and position the transverse curved beam during B-pillar inner panel assembly positioning, thereby directly affecting the assembly efficiency of B-pillar inner panel assembly.

[0006] To achieve the above objectives, those skilled in the art have adopted the following technical solutions: A B-pillar inner panel assembly positioning fixture includes a positioning fixture for fixing and installing a transverse curved beam. The positioning fixture includes a mounting base for mounting at least one ear plate on the transverse curved beam, and a clamping and positioning assembly for clamping and positioning the ear plate. The top surface of the mounting base has a matching placement groove for the entire mounting base to be inserted into. The clamping and positioning assembly can enter the groove of the ear plate pre-placed in the placement groove. The clamping and positioning assembly includes a column and a first core column, a second core column, and a pair of symmetrically arranged rubber plates connected thereto. The bottom ends of the two core columns have coaxially arranged positioning pins with decreasing diameters, so that each core column... Each end has a positioning platform; the bottom ends of the two positioning pins are conical, which are used to be coaxially and slidably inserted into the two through holes of the ear plate near the transverse curved beam body, and the positioning platform is used to be tightly attached to the top surface of the corresponding through hole for positioning; the two rubber plates are arranged in a V-shape to fit the two opposite inner sidewalls of the groove of the ear plate, so that when the column moves down together, they can be tightly attached to the two opposite inner sidewalls of the groove; during the process of the column entering the groove of the ear plate, the two rubber plates press against the corresponding inner sidewalls and the positioning platform is tightly attached to the top surface of the through hole, so as to finally realize the fixed positioning and installation of the ear plate in the mounting base.

[0007] Furthermore, the rubber plate is used to closely adhere to the two opposing inner sidewalls of the ear plate near its free end; the first core post and the second core post are each fixedly connected to the side of the column via a connecting rod and remain parallel to the column.

[0008] Furthermore, a connecting tube is fixed to the side of the rubber plate facing away from the inner wall of the ear plate. A mounting shaft is coaxially installed between the two symmetrically arranged connecting tubes. The two ends of the mounting shaft are elastically connected to the connecting tubes through anti-compression springs built into the connecting tubes. The anti-compression springs allow the bottom sides of the two rubber plates to enter the groove of the ear plate under normal conditions. When they slide further into the groove, the two anti-compression springs are squeezed, causing the two connecting tubes to slide towards each other.

[0009] Furthermore, a limiting post is coaxially fixed inside each connecting pipe, and the anti-compression spring is coaxially provided on the outside of the limiting post. Under normal conditions, the free end of the limiting post is located inside the free end of the anti-compression spring so that when the two rubber plates move towards each other, the anti-compression spring has a certain amount of compression. When the end of the mounting shaft inserted into the connecting pipe squeezes the anti-compression spring and contacts the end of the limiting post, the ear plate is pressed tightly, and the positioning platform surface is pressed and adhered to the top surface of the through hole.

[0010] Furthermore, a pair of T-shaped sliders are fixed at intervals near the center of the mounting shaft, and the T-shaped sliders are slidably connected to T-shaped grooves that are vertically arranged on both sides of the column. A cylindrical gear is rotatably mounted in the center of the mounting shaft with elastic damping. The cylindrical gear and the mounting shaft maintain an integral structure under normal conditions and can maintain a meshing state with the rack fixed on the side of the column. So that when the column moves vertically, with the cooperation of the T-shaped slider and the T-shaped groove: when the mounting shaft is not in contact with the limiting post, the cylindrical gear and the rack do not mesh and transmit power, but move synchronously with the column as a whole; when the mounting shaft is in contact with the limiting post and rigidly connected, the column will continue to move downward, causing the cylindrical gear to rotate relative to the mounting shaft and slip, until the column moves downward until the positioning platform surface contacts the top surface of the through hole.

[0011] Furthermore, the cylindrical gear has a retaining ring and a mounting ring at both ends. The retaining ring is detachably fixed to the mounting shaft and fits tightly against the cylindrical gear. The mounting ring is integrally formed with the mounting shaft. The end face of the cylindrical gear facing the mounting ring has a cylindrical cavity. A damping spring is coaxially installed in the cylindrical cavity. An annular force transmission pad is connected to the end of the damping spring facing the mounting ring. The force transmission pad is axially slidably installed in the cylindrical cavity, and the end facing away from the damping spring is pressed by a number of clamping bolts arranged in an annular array on the mounting ring, thereby making the cylindrical gear elastically damped and rotatably mounted on the mounting shaft.

[0012] Furthermore, the nut of the clamping bolt is a cylindrical structure with smooth sides, so as to rotate and engage with the corresponding hole on the mounting ring; a driven gear is coaxially fixed on the part of the nut away from the stud, and all driven gears mesh with the internal gear integrally formed on the inner wall of the adjusting knob that is rotatably mounted on the mounting shaft, so that when the adjusting knob is rotated, all clamping bolts move axially synchronously and squeeze the force transmission pad to the same extent.

[0013] Furthermore, the adjusting knob is threadedly engaged with the mounting ring, and a pre-tensioned coil spring that is always in a compressed state is provided between the two.

[0014] Furthermore, the bottom of the groove near the free end of the ear plate has an insertion hole for the column to enter, and when the column contacts the bottom of the insertion hole, the positioning platform surface is in close contact with the top surface of the through hole.

[0015] Furthermore, a robotic arm is fixed to one side of the column near the top via a bracket. The robotic arm is used to clamp the longitudinal beam, and when the column moves down to the ear plate and is clamped and fixed, the top of the longitudinal beam gripped by the robotic arm is located in the figure-eight interface on the lower side of the middle of the transverse curved beam, so as to realize the positioning of the transverse curved beam and the longitudinal beam.

[0016] Compared with the prior art, the present invention has the following main advantages: 1. Avoid directly clamping the horizontal curved beam to reduce deformation and damage, so as to achieve precise pre-positioning of the workpiece and lay the foundation for high-precision assembly.

[0017] This invention features an ear plate mounting base with a placement groove, enabling the embedded pre-installation of corresponding ear plates for the transverse curved beam. Combined with an auxiliary support beam structure, it effectively supports the weight of the transverse curved beam without external clamping, preventing the ear plates from slipping, shifting, or tilting under the beam's weight, thus achieving initial ear plate placement. The core objective is to facilitate the rapid pre-placement of the transverse curved beam. When using mounting bases with two ear plates for installation and positioning, the overall stability and reliability of the transverse curved beam's positioning are further improved, ensuring that the V-shaped interface in the middle of the transverse curved beam is always in the preset standard position, providing a reliable positioning foundation for the subsequent precise insertion of the longitudinal beam.

[0018] In essence, the present invention fixes the transverse curved beam by pressing and positioning the ear plate, without involving the direct clamping of the transverse curved beam. Therefore, it will not touch the transverse curved beam body, which is the main body. The ear plate is small in size and short in length, and has a relatively safe clamping contact part, so the clamping and positioning can be performed more safely and reliably.

[0019] 2. It adopts a multi-dimensional flexible clamping structure, which takes into account both clamping tightness and workpiece protection.

[0020] This invention innovatively designs a multi-dimensional positioning structure combining core column positioning and flexible rubber plate clamping. The positioning platform at the bottom of the double core columns limits the end face of the ear plate through-hole, preventing vertical offset of the ear plate while also providing a clamping effect during positioning and reinforcing the installation. The V-shaped symmetrical arrangement of the rubber plates conforms to the inner wall of the ear plate groove, achieving side wall clamping and limiting. This dual limiting structure completely eliminates ear plate twisting, offset, and loosening problems, significantly improving positioning accuracy. Simultaneously, the rubber plates, combined with anti-compression springs and connecting tubes, form an elastic adaptive structure that can adaptively adjust the clamping distance according to the actual spacing of the ear plate grooves, achieving flexible and gradual contact clamping. This avoids workpiece compression deformation and surface damage caused by traditional rigid clamping, effectively protecting the workpiece structural integrity and improving the product assembly qualification rate. In addition, the purpose of using the aforementioned elastically telescopic rubber plate is to press the ear plate to a certain extent, preventing the ear plate from easily shaking. This allows the ear plate to still have a certain degree of freedom of movement when the two positioning pins enter the through hole using their bottom conical surfaces, so as to adjust their own position. This avoids the ear plate from easily tilting up or having excessive changes in posture when in contact with the positioning pins if there is no external force pressing it, which would affect the positioning.

[0021] 3. The segmented controllable positioning structure reduces the difficulty of manufacturing and debugging, and improves assembly stability.

[0022] This invention utilizes a vertical guiding structure of a T-shaped slider and a T-shaped groove, along with a gear and rack damping transmission structure. When necessary, it can automatically divide the fixture lowering operation into two stages, achieving step-by-step completion of clamping and end-face limiting actions. This eliminates the need for stringent synchronization accuracy requirements and significantly reduces the difficulty of fixture processing, assembly, and debugging.

[0023] Specifically, this invention also features an adjustable damping structure. By rotating the adjustment knob, the meshing transmission between the internal gear and the driven gear allows for simultaneous adjustment of the clamping force of multiple sets of clamping bolts, precisely adjusting the compression of the damping spring. This enables controllable adjustment of the cylindrical gear damping rotation force, specifically adapting to the clamping and positioning needs of ear plates of different specifications and thicknesses, effectively improving the adaptability and versatility of the fixture. Simultaneously, a pre-tensioned spring is installed between the adjustment knob and the mounting ring to eliminate threaded assembly gaps, preventing the adjustment knob from loosening due to vibration during long-term operation, and stably locking the damping parameters to ensure the stability and consistent damping effect of the fixture during long-term operation.

[0024] Other positive effects, advantages, and optimized technical features of the present invention will be explained and demonstrated through detailed descriptions of subsequent specific embodiments. Some technical features require further understanding and application by those skilled in the art through thorough research and practice of the present invention. Attached Figure Description

[0025] Figure 1 This is a front view of a B-pillar inner panel assembly; Figure 2 This is a left view of a B-pillar inner panel assembly; Figure 3 This is an exploded schematic diagram of a B-pillar inner panel assembly. Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 for Figure 3 Enlarged view of point B in the middle; Figure 6 for Figure 3 Enlarged view of point C in the middle; Figure 7 for Figure 1 Enlarged view at point D; Figure 8 This is a partial cross-sectional view of the end face of the first ear plate when it is installed in the mounting base. Figure 9 This is a schematic diagram of the end face of the first ear plate when it is installed in the mounting base. Figure 10 This is a cross-sectional schematic diagram of the first ear plate being pressed and positioned within the mounting base by the clamping assembly. Figure 11 A schematic diagram of the clamping and positioning component under normal conditions. Figure 12 A half-sectional view of an elastically damped rotational structure of a cylindrical gear and a mounting shaft; Figure 13 A cross-sectional view of an elastically damped rotational structure with an adjustable cylindrical gear and mounting shaft; Figure 14 This is an axial sectional view of the adjustment knob.

[0026] The components include: a horizontal curved beam 1, a first ear plate 101, a through hole 10101, a second ear plate 102, a horizontal curved beam body 103, a figure-eight interface 10301, a longitudinal beam 2, a support beam 3, a mounting base 4, a core column 5, a positioning platform 501, a positioning pin 6, a connecting rod 7, a rubber plate 8, a connecting pipe 9, a compression spring 10, a limiting post 11, a mounting shaft 12, a retaining ring 13, a cylindrical gear 14, a mounting ring 15, a rack 16, a column 17, a T-shaped slide 1701, a damping spring 18, a force transmission pad 19, a clamping bolt 20, a nut 2001, a driven gear 21, an adjusting knob 22, an internal gear 2201, and a pre-tensioning coil spring 23. Detailed Implementation

[0027] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the principles of this invention will be explained in detail below with reference to the accompanying drawings and at least one detailed embodiment. Those skilled in the art should understand that the specific embodiments described below are merely for explaining the technical principles of this invention and are not intended to limit the invention to such implementation.

[0028] This invention proposes a positioning fixture for assembling the B-pillar inner panel assembly. For the specific structure of the B-pillar inner panel assembly involved, please refer to [link / reference needed]. Figures 1-7 One of the main structures of this assembly positioning clamp is the one that adapts to the assembly positioning operation of the transverse curved beam 1 of the B-pillar inner panel assembly when it is connected to the longitudinal beam 2. Specifically, it includes a positioning fixture for fixing and installing the transverse curved beam 1. This positioning fixture is equipped with a mounting base 4 and a clamping positioning component, such as... Figures 8-9 As shown, this mounting base 4 is a dedicated mounting and positioning structure for ear plates. It can be matched with the ear plates on the transverse curved beam 1 to achieve load-bearing installation, such as for the fixed installation of the first ear plate 101, thereby achieving the fixed installation of the entire transverse beam. It can also adaptively add a mounting base 4 for the fixed installation of the second ear plate 102 to improve the stability and reliability of the fixed positioning of the transverse curved beam 1. In this embodiment, the mounting base 4 for the first ear plate 101 is used as an example. The top surface of this mounting base 4 has a placement groove adapted to its own structure, allowing for the overall embedded placement of the mounting base 4. Initially, the corresponding ear plate is pre-positioned in the placement groove. If there are no other auxiliary mechanisms for pre-clamping, a temporary support beam 3 for the transverse curved beam body 103 can be added. This support beam 3 is a strip structure, located at the lower end of one end of the mounting base 4, used to temporarily support the transverse curved beam body 103, facilitating the installation of the transverse curved beam 1 as described above. Figure 3When the ear plate is positioned against the support beam 3, it can be located within the mounting slot of the mounting base 4 without falling down with the main body 103 of the horizontal curved beam. In practice, if the support beam 3 is not provided, the horizontal curved beam 1 can be temporarily supported manually or by machine against the corresponding end of the mounting base 4. Once clamping and positioning are completed, it can be released. Unlike traditional clamps, the horizontal curved beam will not be clamped forcefully for gripping, moving, and positioning, thus ensuring safety and reliability. In specific manufacturing, the support beam 3 is adapted to the specific structure, requiring only that it does not slide out of the mounting slot due to the weight of the main body of the horizontal beam when the ear plate is placed in the mounting slot. This ensures that the mounting slot provides initial positioning for the ear plate and that the ear plate can remain stationary in the mounting slot without external pressure or clamping. In this embodiment, the clamping and positioning component can extend into the groove of the ear plate pre-placed inside the mounting slot so that the clamping and positioning of the ear plate is completed when it is finally moved into place. Specifically, as Figures 8-11 As shown, this clamping and positioning assembly consists of a column 17, a core column 5 (specifically, a first core column and a second core column), and a set of symmetrically arranged rubber plates 8. Both the first and second core columns have coaxial, reduced-diameter positioning pins 6 at their bottom ends, allowing each core column 5 to form an independent positioning platform 501. It should be noted that the bottom end of the positioning pin 6 must be a conical surface to facilitate insertion into the through hole 10101 for guidance. During assembly and positioning, for example, the positioning pins 6 at the bottom ends of the two core columns 5 can be coaxially slidably inserted into the two through holes 10101 near the transverse curved beam body 103 of the first ear plate 101 (e.g., ...). Figure 4 (As shown) inside, as Figures 8-10 As shown, the positioning and limiting of the ear plate (e.g., the first ear plate 101) is achieved by the contact between the positioning platform 501 and the top surface of the corresponding through hole 10101. The two sets of rubber plates 8 adopt a V-shaped layout structure that adapts to the two opposing inner sidewalls of the ear plate groove. As the column 17 moves down as a whole, the two rubber plates 8 can respectively fit tightly against the two opposing inner sidewalls of the ear plate groove, gradually and firmly pressing the ear plate in the groove. That is, during the operation of the column 17 continuously entering the ear plate groove, when the rubber plate 8 presses against the inner sidewall of the ear plate groove, at the same time, the positioning platform 501 of the core column 5 fits against the top surface of the through hole 10101. From the two dimensions of sidewall clamping and end face limiting, the ear plate is further precisely fixed and positioned inside the mounting base 4. This provides a stable positioning foundation for the subsequent accurate sliding of the top of the longitudinal beam 2 into the figure-eight interface 10301 on the lower side of the middle of the transverse curved beam 1, which fits tightly into one body to complete the assembly operation.

[0029] In this embodiment, the fitting and positioning area of ​​the rubber plate 8 is specifically matched to the free end position of the ear plate. Considering that the ear plate has a protrusion at one end near the transverse curved beam body 103, and the protrusion is provided with the aforementioned through hole 10101, as well as the flatness of the side wall of the groove of the ear plate, the two rubber plates 8 in this embodiment are specifically used to tightly adhere to the two opposing inner side walls at the free end of the ear plate. At the same time, the first core column and the second core column are both fixedly connected to the side of the column 17 by independent connecting rods 7. All connecting rods 7 adopt a regular arrangement structure, so that the two core columns 5 are kept parallel to the column 17, ensuring that when the core column 5 moves down with the column 17, it is inserted into the two through holes 10101 of the ear plate, preventing the ear plate from twisting and moving, and performing a position correction on the ear plate that was originally initially placed in the mounting base 4. More specifically, this embodiment also provides a detailed description of the elastic movement structure of the rubber plate 8: such as Figures 10-11 A connecting pipe 9 is fixedly mounted on the outer wall of each rubber plate 8, opposite to the inner wall of the ear plate. Between two sets of symmetrically arranged connecting pipes 9, a mounting shaft 12 is coaxially mounted. The two ends of the mounting shaft 12 are respectively inserted into the two connecting pipes 9, and an anti-compression spring 10 is built into the connecting pipe 9. The end of the mounting shaft 12 forms an axially movable elastic insertion fit structure with the connecting pipe 9 through the anti-compression spring 10. In the normal state of the clamp, i.e., in the unclamped working state, relying on the elastic support force of the anti-compression spring 10, the bottom sides of the two rubber plates 8 can naturally extend into the groove of the ear plate, so as to enter the groove of the ear plate for subsequent clamping action; when the column 17 drives the rubber plates 8 to continue to move downwards, the rubber plates 8 can move from... Figure 11 As shown, when the plate slides further into the groove of the ear plate at the indicated position, the inner wall of the groove will exert a reverse compressive force on the two rubber plates 8, causing the two sets of anti-compression springs 10 to undergo elastic deformation, such as... Figure 10 As shown, the two sets of connecting tubes 9 slide towards each other, adaptively matching the inner spacing of the ear plate groove, achieving flexible and gradual fitting and clamping, which ensures clamping tightness and avoids rigid compression damage to the ear plate.

[0030] As one of the specific implementation structures, a limiting and guiding structure is also added to achieve precise control of the clamping stroke and positioning state. Specifically, a limiting post 11 is coaxially fixedly installed inside each set of connecting pipes 9, and a corresponding anti-compression spring 10 is coaxially sleeved on the outside of the limiting post 11. Under normal operating conditions of the fixture, the free end of the limiting post 11 is housed inside the free end of the anti-compression spring 10, that is, the elastic compression stroke of the anti-compression spring 10 is reserved, ensuring that the anti-compression spring 10 can undergo compression deformation during the movement of the two rubber plates 8 towards each other, so as to achieve adaptive fitting and clamping between the rubber plate 8 and the inner wall of the ear plate. As the column 17 continues to move downward, it causes the mounting shaft 12 and rubber plate 8 to move synchronously until the end of the mounting shaft 12 is in rigid contact with the end of the limiting column 11. At this time, the rubber plate 8 can no longer move closer together and completely presses against the inner side wall of the ear plate groove. At the same time, the positioning platform 501 at the bottom of the core column 5 is tightly pressed against the top surface of the ear plate through hole 10101 under the displacement limiting action, which completely and permanently locks the positioning position of the ear plate, prevents assembly loosening and positioning offset problems, and ensures assembly accuracy.

[0031] In the above embodiments, to reduce manufacturing difficulty and improve the accuracy and reliability of linkage, this embodiment does not require the mounting shaft 12 to contact the limiting post 11 and the positioning platform 501 to contact the top surface of the through hole 10101 simultaneously. Instead, it is designed so that the positioning platform 501 contacts the top surface of the through hole 10101 only after the limiting post 11 contacts the mounting shaft 12. Specifically, a vertical sliding guide structure and a damping transmission structure for the mounting shaft 12 are specially provided: a pair of T-shaped sliders (not shown in the figure) are fixedly installed at intervals near the middle of the mounting shaft 12. Figure 10 , Figure 11As shown, T-shaped grooves 1701 matching the T-shaped slider are vertically formed on both the left and right sides of the column 17. The T-shaped slider and the T-shaped grooves 1701 form a vertical sliding fit structure, which precisely guides the up and down movement of the mounting shaft 12, avoiding lateral deviation, and especially preventing the two from completely separating. At the same time, a cylindrical gear 14 is elastically damped and rotated at the middle position of the mounting shaft 12. Under normal working conditions, the cylindrical gear 14 is relatively fixed to the mounting shaft 12, forming an integrated synchronous movement structure. That is, the cylindrical gear 14 and the rack 16 fixed on the side of the column 17 are always in a meshing state. During the vertical downward movement of the column 17, the operation is divided into two stages: In the first stage, when the end of the mounting shaft 12 is not in contact with the limiting post 11, the cylindrical gear 14 and the rack 16 do not mesh relative to each other. They rely solely on the meshing relationship of the gear teeth and the connection relationship between the T-shaped slide groove 1701 and the T-shaped slider to maintain an integrated structure. They can move down synchronously with the column 17, that is, the cylindrical gear 14 moves down synchronously with the column 17 and the mounting shaft 12 as a whole, without any rotational movement; In the second stage, the end of the mounting shaft 12 compresses the anti-compression spring 10 and... After the limiting post 11 makes rigid contact, the vertical displacement of the mounting shaft 12 is limited and fixed. At this time, if the positioning platform 501 has not yet contacted the top surface of the through hole 10101, the column 17 needs to continue to move downward, which will force the cylindrical gear 14 to rotate with damping relative to the mounting shaft 12 and form a slip state until the column 17 moves down to the preset stroke or position, so that the positioning platform 501 of the core column 5 accurately fits the top surface of the through hole 10101, completing the final pressing and positioning, greatly reducing the manufacturing difficulty and improving reliability.

[0032] like Figures 10-11 As shown, in this embodiment, the cylindrical gear 14 is further provided with a retaining ring 13 and a mounting ring 15 at both ends. The retaining ring 13 adopts a detachable assembly structure, for example, it is fixed to the mounting circumference by a radially arranged locking screw, and can fit tightly with the end face of one end of the cylindrical gear 14 to achieve axial one-sided limiting. The mounting ring 15 and the mounting shaft 12 adopt an integral molding structure, which has higher structural strength and stronger stability. At the same time, the cylindrical gear 14 has a coaxially arranged cylindrical cavity on the end face facing the mounting ring 15, such as... Figure 12 , Figure 13A damping spring 18 is coaxially mounted inside the cylindrical cavity. An annular force-transmitting pad 19 is connected to the end of the damping spring 18 facing the mounting ring 15. The force-transmitting pad 19 adapts to the inner diameter of the cylindrical cavity to achieve axial sliding assembly. Simultaneously, several threaded clamping bolts 20 are arranged in an annular array on the mounting ring 15. The ends of all clamping bolts 20 together press the side of the force-transmitting pad 19 away from the damping spring 18, cooperating with the retaining ring 13 to achieve elastic damped rotational mounting of the cylindrical gear 14. Through the above structural design, relying on the clamping force of the clamping bolts 20 combined with the elastic force of the damping spring 18, the cylindrical gear 14 always possesses an elastic damped rotational effect, stably achieving the damped slippage action of the cylindrical gear 14 relative to the mounting shaft 12 under the aforementioned specific working conditions, ensuring the reliability of clamping and positioning of the ear plate. To better achieve the above technical effects, a more superior design structure is to add a structure with adjustable damping force to adapt to the assembly requirements of different workpieces. For example... Figure 13 All nuts 2001 of the clamping bolts 20 are designed with smooth cylindrical structures on the sides, allowing for rotational engagement with the corresponding mounting holes on the mounting ring 15 without any jamming resistance. Simultaneously, a driven gear 21 is coaxially fixed to the end face of each nut 2001 facing away from the stud, and an adjustment knob 22 is rotatably mounted on the mounting shaft 12. (See also...) Figure 14 The inner wall of the adjusting knob 22 is integrally formed with an internal gear 2201 structure, and all driven gears 21 mesh with the internal gear 2201. During operation, rotating the adjusting knob 22 can drive the internal gear 2201 to rotate synchronously, thereby driving all driven gears 21 to rotate synchronously, driving all clamping bolts 20 to move axially synchronously, uniformly adjusting the squeezing force on the force transmission pad 19, achieving precise adjustment of the compression of the damping spring 18, and finally, the damping rotation force of the cylindrical gear 14 can be adjusted specifically to adapt to the clamping and positioning operations of different specifications of ear plates, improving the versatility and adaptability of the fixture.

[0033] More specifically, such as Figure 13 As shown, the adjustment knob 22 and the mounting ring 15 are assembled using a threaded connection. A preload spring 23 is provided between the adjustment knob 22 and the mounting ring 15. The preload spring 23 is always in a compressed state, which can continuously apply elastic preload force to the adjustment knob 22, effectively eliminating the threaded assembly gap. This prevents the adjustment knob 22 from loosening or shifting due to vibration and stress during long-term operation of the fixture, stabilizes and locks the damping force adjustment parameters, ensures the consistency of the damping effect during long-term operation of the fixture, and improves the stability and reliability of the equipment operation.

[0034] As a specific embodiment, a limiting structure for the column 17 can be added to precisely control the downward stroke of the column 17. The mounting slot of the mounting base 4 has a corresponding insertion hole (not shown in the figure) at the bottom of the slot near the free end of the ear plate. The structure of the insertion hole is adapted to the bottom of the column 17, allowing the column 17 to be vertically inserted and positioned. Furthermore, during the fixture assembly process, the column 17 moves downward with the external driving element, gradually extending into the insertion hole. When the bottom of the column 17 is fully in contact with the bottom of the insertion hole, the vertical downward stroke of the column 17 reaches the preset limit. At this time, the positioning platform 501 at the bottom of the core column 5 precisely contacts the top surface of the ear plate through hole 10101. Through mechanical rigid limiting, the assembly stroke is precisely locked, completely eliminating the problems of excessive stroke squeezing the workpiece and insufficient stroke resulting in loose positioning, ensuring consistent accuracy in each assembly positioning.

[0035] The above embodiment, as one of the core positioning fixtures for assembling the B-pillar inner panel assembly, achieves the fixed positioning of the most difficult-to-clamp and position crossbeam. With the crossbeam fixed, the aforementioned figure-eight interface 10301 can be accurately positioned in the preset location, allowing it to connect with the top of the longitudinal beam 2, which moves down along a predetermined path and inserts into the figure-eight interface 10301. Based on existing technology, an auxiliary positioning structure for the longitudinal beam 2 can generally be added to achieve synchronous positioning and assembly of the crossbeam 1 and the longitudinal beam 2. After fixing the crossbeam 1, the top of the longitudinal beam 2 can be slid into the figure-eight interface 10301 manually or automatically until it reaches the desired position. Figure 7 The connection position is shown for subsequent fixation. As one example, a bracket (not shown in the figure) can be fixedly mounted on the side of the column 17 near the top. A special robot arm is fixedly mounted on this bracket. The robot arm can stably clamp and fix the longitudinal beam 2 so that the longitudinal beam 2 can smoothly slide into the aforementioned figure-eight interface 10301 of the precisely positioned transverse curved beam 1. During the clamping operation, when the column 17 moves down to the preset stroke, so that the ear plate is completely clamped and fixed by the clamping positioning component and the transverse curved beam 1 is positioned, the robot arm, which moves into position with the column 17, clamps the longitudinal beam 2 so that the top of the longitudinal beam 2 exactly corresponds to the figure-eight interface 10301 on the lower side of the middle of the transverse curved beam 1. Through the integrated displacement action of the clamp, the alignment and positioning of the transverse curved beam 1 and the longitudinal beam 2 are completed simultaneously, without the need for secondary alignment adjustment, simplifying the assembly process of the B-pillar inner panel assembly and improving the overall efficiency and alignment accuracy of the assembly.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. The series of detailed descriptions of the embodiments of this application, and the specific examples used, have provided a detailed discussion of the technical principles and implementation methods of this application. They are only intended to help those skilled in the art to deeply and comprehensively understand the design concept of this application, and should not be construed as the sole or selective limitation on the technical principles themselves. As for the detailed description of the preferred embodiments mentioned in this application, those skilled in the art should be able to make simple modifications or equivalent substitutions to the technical solutions of the present invention based on these preferred embodiments. However, the core technical principles should be covered within the protection scope embodied in the claims of this invention without departing from the technical concept, design purpose, and scope of application of the present invention.

Claims

1. A positioning fixture for assembling a B-pillar inner panel assembly, comprising a positioning fixture for fixing and installing a transverse curved beam (1), characterized in that, The positioning fixture includes a mounting base (4) for mounting at least one ear plate on the transverse curved beam (1), and a clamping and positioning assembly for clamping and positioning the ear plate. The top surface of the mounting base (4) is provided with a matching placement groove for the entire mounting base (4) to be placed in. The clamping and positioning assembly can enter the groove of the ear plate that is pre-placed in the mounting slot. The clamping and positioning assembly includes a column (17) and a first core column, a second core column and a pair of rubber plates (8) arranged symmetrically on the left and right. The bottom ends of the two core columns (5) have coaxially arranged positioning pins (6) with decreasing diameter, so that the bottom end of each core column (5) has a positioning platform (501). The bottom ends of the two positioning pins (6) are conical surfaces, which are used to be coaxially slidably inserted into the two through holes (10101) of the ear plate near the transverse curved beam body (103), and the positioning platform (501) is used to be tightly attached to the top surface of the corresponding through hole (10101) for positioning. The two rubber plates (8) are arranged in a V-shape to fit the two opposite inner walls of the groove of the ear plate, so that when the column (17) moves down together, they can be tightly attached to the two opposite inner walls of the groove. When the column (17) enters the groove of the ear plate, the two rubber plates (8) press against the corresponding inner walls and the positioning platform (501) is tightly attached to the top surface of the through hole (10101) so as to finally achieve the fixed positioning and installation of the ear plate in the mounting base (4).

2. The B-pillar inner panel assembly positioning fixture according to claim 1, characterized in that, The rubber plate (8) is used to closely adhere to the two opposite inner sidewalls of the ear plate near the free end; the first core column and the second core column are each fixedly connected to the side of the column (17) through a connecting rod (7) and remain parallel to the column (17).

3. The B-pillar inner panel assembly positioning fixture according to claim 1, characterized in that, A connecting tube (9) is fixed on the side of the rubber plate (8) facing away from the inner wall of the ear plate. A mounting shaft (12) is coaxially installed between the two symmetrically arranged connecting tubes (9). The two ends of the mounting shaft (12) are elastically connected to the connecting tubes (9) through the anti-compression springs (10) built into the connecting tubes (9). The anti-compression springs (10) allow the bottom sides of the two rubber plates (8) under normal conditions to enter the groove of the ear plate. When they slide further into the groove, the two anti-compression springs (10) are squeezed and the two connecting tubes (9) slide towards each other.

4. A B-pillar inner panel assembly positioning fixture according to claim 3, characterized in that, A limiting post (11) is coaxially fixed inside each connecting pipe (9). The anti-compression spring (10) is coaxially provided on the outside of the limiting post (11). Under normal conditions, the free end of the limiting post (11) is located inside the free end of the anti-compression spring (10) so that when the two rubber plates (8) move towards each other, the anti-compression spring (10) has a certain amount of compression. When the end of the mounting shaft (12) inserted into the connecting pipe (9) squeezes the anti-compression spring (10) and contacts the end of the limiting post (11), the ear plate is pressed, and the positioning platform (501) is pressed and adhered to the top surface of the through hole (10101).

5. A B-pillar inner panel assembly positioning fixture according to claim 4, characterized in that, A pair of T-shaped sliders are fixed at intervals near the center of the mounting shaft (12), and the T-shaped sliders are slidably connected to the T-shaped slide grooves (1701) that are vertically arranged on both sides of the column (17); A cylindrical gear (14) is rotatably mounted on the central elastic damping of the mounting shaft (12). The cylindrical gear (14) and the mounting shaft (12) maintain an integral structure under normal conditions and can maintain a meshing state with the rack (16) fixed on the side of the column (17). So that when the column (17) moves vertically, with the cooperation of the T-shaped slider and the T-shaped groove (1701): when the mounting shaft (12) is not in contact with the limiting post (11), the cylindrical gear (14) and the rack (16) do not mesh and transmit power, but move synchronously together with the column (17); when the mounting shaft (12) is in contact with the limiting post (11) and rigidly connected, the column (17) will continue to move down, causing the cylindrical gear (14) to rotate relative to the mounting shaft (12) and slip, until the column (17) moves down to the point where the positioning table (501) contacts the top surface of the through hole (10101).

6. A B-pillar inner panel assembly positioning fixture according to claim 5, characterized in that, The cylindrical gear (14) has a retaining ring (13) and a mounting ring (15) at its two ends respectively. The retaining ring (13) is detachably fixed on the mounting shaft (12) and closely attached to the cylindrical gear (14). The mounting ring (15) is integrally formed with the mounting shaft (12). The cylindrical gear (14) has a cylindrical cavity in the end face facing the mounting ring (15). A damping spring (18) is coaxially installed in the cylindrical cavity. An annular force transmission pad (19) is connected to the end of the damping spring (18) facing the mounting ring (15). The force transmission pad (19) is axially slidably installed in the cylindrical cavity and the end facing away from the damping spring (18) is pressed by a number of clamping bolts (20) arranged in an annular array on the mounting ring (15), so that the cylindrical gear (14) is elastically damped and rotatably mounted on the mounting shaft (12).

7. A B-pillar inner panel assembly positioning fixture according to claim 6, characterized in that, The nut (2001) of the clamping bolt (20) is a cylindrical structure with smooth sides, which is rotated to fit with the corresponding hole on the mounting ring (15); a driven gear (21) is coaxially fixed on the part of the nut (2001) away from the stud. All driven gears (21) mesh with the internal gear (2201) integrally formed on the inner wall of the adjusting knob (22) which is rotatably mounted on the mounting shaft (12), so that when the adjusting knob (22) is rotated, all clamping bolts (20) move axially synchronously and squeeze the force transmission pad (19) to the same extent.

8. A B-pillar inner panel assembly positioning fixture according to claim 7, characterized in that, The adjustment knob (22) is threadedly connected to the mounting ring (15), and a pre-tensioned coil spring (23) that is always in a compressed state is provided between the two.

9. A B-pillar inner panel assembly positioning fixture according to claim 4, characterized in that, The bottom of the groove near the free end of the ear plate of the placement groove has an insertion hole for the column (17) to enter. When the column (17) contacts the bottom of the insertion hole, the positioning platform (501) is in contact with the top surface of the through hole (10101).

10. A B-pillar inner panel assembly positioning fixture according to claim 1, characterized in that, The column (17) is also fixed with a robotic arm by a bracket on one side near the top. The robotic arm is used to hold the longitudinal beam (2). When the column (17) moves down to the ear plate and is clamped and fixed, the top of the longitudinal beam (2) held by the robotic arm is located in the figure-eight interface (10301) on the lower side of the middle of the horizontal curved beam (1) to realize the positioning of the horizontal curved beam (1) and the longitudinal beam (2).

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