Bidirectional four-guide-rod linear guide mechanism

Abstract

This utility model relates to a bidirectional four-guide rod linear guide mechanism, belonging to the field of guide mechanism technology. It includes: an upper mounting plate assembly, a middle mounting plate assembly, and a lower mounting plate assembly arranged sequentially from top to bottom; a sensor connected between the upper and middle mounting plate assemblies; and a linear loading device connected between the middle and lower mounting plate assemblies. This utility model eliminates lateral forces and torsional torques, ensuring that the sensor only bears pure axial tensile force, improving the accuracy and reliability of measurement data, while also enhancing the overall stability of the equipment and extending its service life.

Description

Technical Field

[0001] This utility model relates to the field of guiding mechanisms, and in particular to a bidirectional four-guide rod linear guiding mechanism. Background Technology

[0002] With the rapid development of the air transport industry, aerial refueling technology has become a core means of extending the range of fighter jets and transport aircraft. In the research and development of aerial refueling technology, ground-based simulation testing is an essential step for safety and economy. The tanker docking simulation test bench is a new type of test bench developed to simulate the docking performance of aerial refueling.

[0003] In the structure of the refueling machine docking simulation test bench, the installation and measurement accuracy of the tensile sensor and the linear loading device are crucial components. The tensile sensor is directly connected to the linear loading device, and the installation connection structure between the two directly affects the sensor's measurement accuracy and stability. Due to the large impact forces during the test, the installation strength and accuracy requirements for both the tensile sensor and the linear loading device are relatively high.

[0004] However, currently used connection and installation structures for tension sensors and linear loading equipment include direct mounting and linear loading equipment guiding structures. Although these structures can achieve basic guidance and installation, the sensor will twist during the movement of the linear loading equipment under heavy loads, leading to inaccurate measurement data. In severe cases, it may even damage the sensor structure, causing safety hazards and economic losses.

[0005] Therefore, there is an urgent need for a guiding mechanism that can solve the above problems in terms of functionality, safety, and economy. Utility Model Content

[0006] In view of the above problems, this application proposes a bidirectional four-guide rod linear guiding mechanism, which includes:

[0007] The upper mounting plate assembly, the middle mounting plate assembly, and the lower mounting plate assembly are arranged sequentially from top to bottom, as well as a sensor connected between the upper mounting plate assembly and the middle mounting plate assembly, and a linear loading device connected between the middle mounting plate assembly and the lower mounting plate assembly;

[0008] The middle mounting plate assembly includes a cross-shaped middle mounting plate;

[0009] The upper mounting plate assembly is symmetrically provided with upper guide shaft mounting seats;

[0010] The middle mounting plate assembly is symmetrically provided with a first linear bearing and an upper guide shaft that cooperate with the upper guide shaft mounting seat. The upper guide shaft and the first linear bearing slide together to form a first guide pair.

[0011] The lower mounting plate assembly is symmetrically provided with a second linear bearing;

[0012] The mounting plate assembly is also symmetrically provided with a lower guide shaft mounting seat and a lower guide shaft that cooperate with the second linear bearing. The lower guide shaft and the second linear bearing slide together to form a second guide pair.

[0013] The spatial arrangement of the first guide pair and the second guide pair is perpendicular, which together constrains the middle mounting plate assembly to move only in a straight line in the vertical direction.

[0014] Preferably, the upper mounting plate assembly includes an upper mounting plate, a sensor upper mounting block, and a pull ring;

[0015] The sensor mounting block is fixed to the center of the upper mounting plate;

[0016] The pull ring passes through the mounting block on the sensor and connects to the upper end of the sensor;

[0017] The upper guide shaft mounting base is fixed to both sides of the upper mounting plate.

[0018] Preferably, the mounting plate assembly further includes:

[0019] Connecting sleeve;

[0020] The connecting sleeve is fixed at the center hole of the mounting plate of the cross-shaped structure, with its upper part connected to the lower end of the sensor and its lower part connected to the output end of the linear loading device.

[0021] Preferably, the lower mounting plate assembly includes a lower mounting plate;

[0022] The linear loading device is bolted to the middle hole of the lower mounting plate;

[0023] The second linear bearing is fixed to both sides of the lower mounting plate;

[0024] The lower guide shaft is provided with a limiting nut at its end.

[0025] Preferably, the upper part of the connecting sleeve is threaded to the lower end of the sensor, and the lower part is threaded to the output end of the linear loading device.

[0026] Preferably, the two sets of opposite holes on the middle mounting plate of the cross-shaped structure are used to install the first linear bearing in one set and the lower guide shaft mounting seat in the other set.

[0027] Preferably, the mechanism is used in an aerial refueling docking simulation test bench, wherein the first guide pair and the second guide pair work together to prevent the sensor from being subjected to lateral forces and torsional torques.

[0028] The technical solution provided in this application has at least the following technical effects or advantages:

[0029] The bidirectional four-guide rod linear guiding mechanism provided by this utility model achieves precise linear motion constraint through the bidirectional four-guide rod mechanism, and combines a cross-shaped central connection structure to separate and optimize the power transmission path and the guiding constraint path, so that all non-axial forces are absorbed by the guiding mechanism, and only the purified axial tensile force acts on the sensor.

[0030] The bidirectional four-guide rod linear guide mechanism provided by this utility model solves the problem of decreased measurement accuracy and structural damage caused by torsion of the sensor under heavy load impact conditions through the design of the bidirectional four-guide rod linear guide mechanism and the cross-shaped central mounting plate. The bidirectional guide pair works together to eliminate lateral force and torsional torque, ensuring that the sensor only bears pure axial tensile force, improving the accuracy and reliability of measurement data, while enhancing the overall stability and service life of the equipment, and combining excellent functionality, safety and economy. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic diagram of the structure of a bidirectional four-guide rod linear guide mechanism provided by this utility model;

[0033] Figure 2 A schematic diagram of the upper mounting plate assembly in a bidirectional four-guide rod linear guide mechanism provided by this utility model;

[0034] Figure 3 A schematic diagram of the middle mounting plate assembly in a bidirectional four-guide rod linear guide mechanism provided by this utility model;

[0035] Figure 4 A schematic diagram of the lower mounting plate assembly in a bidirectional four-guide rod linear guide mechanism provided by this utility model;

[0036] The components represented by each number in the attached diagram are explained below:

[0037] Upper mounting plate assembly 10, pull ring 11, sensor upper mounting block 12, upper mounting plate 13, upper guide shaft mounting seat 14, middle mounting plate assembly 20, connecting sleeve 21, middle mounting plate 22, linear bearing 23, upper guide shaft 24, lower guide shaft mounting seat 25, lower mounting plate assembly 30, lower mounting plate 31, sensor 40, linear loading device 50. Detailed Implementation

[0038] This utility model provides a bidirectional four-guide rod linear guiding mechanism to solve the technical problem in the existing fuel dispenser docking simulation test bench where the connection and installation structure between the tension sensor and the linear loading device is prone to torsion during movement, resulting in inaccurate measurement data and even damage to the sensor structure in severe cases.

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] In the description of this application, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0041] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0042] Examples, as shown in the appendix Figure 1 As shown, this application provides a bidirectional four-guide rod linear guide mechanism, comprising:

[0043] In this embodiment of the utility model, the operating mechanism of the bidirectional four-guide rod linear guide mechanism is as follows: In view of the problem that the traditional direct installation and linear loading equipment guide structure is prone to torsion under heavy load, resulting in measurement errors and equipment damage, this utility model achieves reliable constraint through the synergistic effect of the two guide pairs arranged in a spatial vertical layout.

[0044] Specifically, the first guide pair (composed of an upper guide shaft and a linear bearing) primarily constrains the degree of freedom of the mounting plate assembly in one direction (e.g., the Y direction); the second guide pair (composed of a lower guide shaft and a linear bearing) constrains the degree of freedom of the mounting plate assembly in another direction (e.g., the X direction). The first and second guide pairs together form an over-positioning constraint in a spatial rectangular coordinate system, retaining only the Z-axis rotational degree of freedom, which has no effect on measurement, thereby eliminating the two translational degrees of freedom and two rotational degrees of freedom of the mounting plate in the horizontal plane.

[0045] Furthermore, to isolate the influence of non-axial forces on the sensor, this invention employs a cross-shaped mounting plate structure to optimize the force flow path. The thrust generated by the linear loading device is concentrated and transmitted through a connecting sleeve, which is rigidly fixed to the geometric center of the cross-shaped mounting plate, ensuring that the thrust is transmitted symmetrically outward from the center point. Any torsional moment generated due to off-center loading or motion is shared and resisted by the four symmetrically arranged guide rods and their bearings; the high torsional stiffness of the cross-shaped structure itself ensures that the moment is completely confined within the guiding system and will not be transmitted to the sensor. Thus, the two ends of the sensor always maintain an ideal alignment, and the load it bears is always a pure axial tensile force.

[0046] Thus, this utility model achieves precise linear motion constraint through a "bidirectional four-guide rod" mechanism, and optimizes the separation of the power transmission path and the guiding constraint path by combining a "cross-shaped center connection" structure. This allows all non-axial forces to be absorbed by the guiding mechanism, and only the purified axial tension acts on the sensor. Ultimately, this achieves high-precision, high-stability, and high-reliability measurement under high-load and high-impact conditions.

[0047] In this embodiment of the utility model, the operation process of the bidirectional four-guide rod linear guide mechanism is as follows: When the linear loading device 50 starts and outputs thrust, its output end transmits the thrust to the lower end of the connecting sleeve 21. The connecting sleeve 21, as the core force transmission component, transmits the force upward: on the one hand, it directly acts on the lower end of the sensor 40, so that it bears the axial tensile load; on the other hand, it pushes the entire assembly of the middle mounting plate 22, which is fixedly connected to it, to generate an upward displacement trend.

[0048] During this process, the lower guide shaft 33, installed on one side of the middle mounting plate 22, rises with the entire assembly. Its shaft slides precisely within the linear bearing 32 of the lower mounting plate 31, effectively constraining the radial offset of the linear loading device 50 during movement and ensuring the stability of the thrust direction. Simultaneously, the upper guide shaft 24, fixed on the other side of the middle mounting plate 22, moves synchronously. Its shaft slides within the upper guide shaft mounting seat 14 of the upper mounting plate 13, providing precise axial guidance for the sensor 40 and effectively preventing the sensor from generating lateral forces and torsional torques during operation.

[0049] The mounting plate 22 adopts a cross-shaped structure design, with mounting holes on its four symmetrically distributed arm plates: one pair of symmetrical holes for mounting linear bearings 23 to guide the upper guide shaft 24, and another pair of symmetrical holes for mounting lower guide shaft mounting seats 25 to fix the lower guide shaft 33. The central hole of the mounting plate 22 achieves vertical connection through a connecting sleeve 21: its upper end connects to the lower end of the sensor 40, and its lower end connects to the upper end of the linear loading device 50. This design ensures that any possible lateral forces or torsional moments are offset and absorbed by the symmetrically arranged four guide rods and their bearing assemblies, ensuring that the force transmitted to the sensor 40 is always a pure axial tensile force.

[0050] Through the above mechanism, the device integrates the sensor, linear loading equipment and guidance system into a highly rigid and compact whole, which not only ensures the structural stability and installation strength under huge impact loads, but also fundamentally eliminates the risk of data distortion and structural damage caused by uneven force on the sensor, thereby improving measurement accuracy and equipment lifespan.

[0051] Specifically, the bidirectional four-guide rod linear guiding mechanism provided in this embodiment of the present invention includes:

[0052] The upper mounting plate assembly 10, the middle mounting plate assembly 20, and the lower mounting plate assembly 30 are arranged sequentially from top to bottom, as well as the sensor 40 connected between the upper mounting plate assembly 10 and the middle mounting plate assembly 20, and the linear loading device 50 connected between the middle mounting plate assembly 20 and the lower mounting plate assembly 30.

[0053] The middle mounting plate assembly 20 includes a cross-shaped middle mounting plate 22;

[0054] The upper mounting plate assembly 10 is symmetrically provided with upper guide shaft mounting seats 14;

[0055] The middle mounting plate assembly 20 is symmetrically provided with a first linear bearing 23 and an upper guide shaft 24 that cooperate with the upper guide shaft mounting seat 14. The upper guide shaft 24 and the first linear bearing 23 slide to form a first guide pair.

[0056] The lower mounting plate assembly 30 is symmetrically provided with a second linear bearing 32;

[0057] The middle mounting plate assembly 20 is also symmetrically provided with a lower guide shaft mounting seat 25 and a lower guide shaft 33 that cooperate with the second linear bearing 32. The lower guide shaft 33 and the second linear bearing 32 slide together to form a second guide pair.

[0058] The spatial arrangement of the first guide pair and the second guide pair is perpendicular, which together constrains the middle mounting plate assembly 20 to move only in a straight line in the vertical direction.

[0059] In this embodiment of the invention, the bidirectional four-guide rod linear guiding mechanism includes, from top to bottom, an upper mounting plate assembly 10, a middle mounting plate assembly 20, and a lower mounting plate assembly 30, as well as a sensor 40 connected between the upper mounting plate assembly 10 and the middle mounting plate assembly 20, and a linear loading device 50 connected between the middle mounting plate assembly 20 and the lower mounting plate assembly 30. The upper mounting plate assembly 10, the middle mounting plate assembly 20, and the lower mounting plate assembly 30 form a vertical force transmission chain. The sensor 40 is a measuring element connected between the upper mounting plate assembly 10 and the middle mounting plate assembly 20, and the linear loading device 50 is a power source connected between the middle mounting plate assembly 20 and the lower mounting plate assembly 30. This arrangement ensures that the force generated can be directly and without interference transmitted to the sensor.

[0060] In addition, the center mounting plate assembly 20 includes a cross-shaped center mounting plate 22. The cross-shaped structure means that the center mounting plate assembly 20 has four symmetrical arms, which can effectively resist the torsional torque generated by the load. The four arms provide symmetrical mounting points for the first guide pair and the second guide pair, ensuring that the force can be evenly transmitted and distributed from the center outward.

[0061] In addition, the upper mounting plate assembly 10 is symmetrically provided with an upper guide shaft mounting seat 14, and the lower mounting plate assembly 30 is symmetrically provided with a second linear bearing 32. This is the guiding foundation for the stationary part. The upper guide shaft mounting seat 14 is fixed on the upper mounting plate (stationary) and is used to install and fix the upper end of the upper guide shaft. The second linear bearing 32 is fixed on the lower mounting plate (stationary) and provides a precise sliding track for the lower guide shaft.

[0062] Furthermore, the middle mounting plate assembly 20 is symmetrically provided with a first linear bearing 23 and an upper guide shaft 24 that cooperate with the upper guide shaft mounting seat 14, and the middle mounting plate assembly 20 is also symmetrically provided with a lower guide shaft mounting seat 25 and a lower guide shaft 33 that cooperate with the second linear bearing 32. This is the guiding connection of the moving part (i.e., the middle mounting plate assembly 20). The first linear bearing 23 is mounted on the middle mounting plate and slides in cooperation with the fixed upper guide shaft; the lower guide shaft mounting seat 25 is also mounted on the middle mounting plate to fix the upper end of the lower guide shaft, while the lower guide shaft 33 slides in the fixed second linear bearing 32. Thus, the middle mounting plate assembly 20 is the sliding block of the upper guide system through the first linear bearing 23, and the fixed seat of the lower guide system through the lower guide shaft mounting seat 25.

[0063] Furthermore, the upper guide shaft 24 and the first linear bearing 23 slide together to form a first guide pair, and the lower guide shaft 33 and the second linear bearing 32 slide together to form a second guide pair. The first guide pair constrains the degree of freedom in one direction (e.g., the X direction), and the second guide pair constrains the degree of freedom in another direction (e.g., the Y direction).

[0064] Furthermore, the spatial arrangement of the first and second guide pairs is perpendicular, jointly constraining the middle mounting plate assembly 20 to move only in a vertical straight line. The perpendicular spatial arrangement means that the projections of the guide rods of the first and second guide pairs onto the horizontal plane are perpendicular to each other, restricting swaying in the Y and X directions respectively. Through the over-positioning principle, all possibilities of movement and rotation of the middle mounting plate assembly in the horizontal plane are eliminated, allowing it to retain only one degree of freedom of motion: vertical (Z-direction) linear movement.

[0065] In this way, by using a two-way four-guide rod arranged vertically in space, complex motion can be constrained into a single pure linear motion, thus solving the problem of torsion easily occurring under heavy loads in traditional methods.

[0066] In the bidirectional four-guide rod linear guide mechanism provided in this embodiment of the utility model, such as Figure 2 As shown, the upper mounting plate assembly 10 includes:

[0067] Upper mounting plate 13, sensor upper mounting block 12, and pull ring 11;

[0068] The sensor mounting block 12 is fixed to the center of the upper mounting plate 13;

[0069] The pull ring 11 passes through the mounting block 12 on the sensor and is connected to the upper end of the sensor 40;

[0070] The upper guide shaft mounting base 14 is fixed to both sides of the upper mounting plate 13.

[0071] In this embodiment of the present invention, the upper mounting plate assembly 10 includes an upper mounting plate 13, a sensor upper mounting block 12, and a pull ring 11.

[0072] Furthermore, the sensor mounting block 12 is fixed to the center of the upper mounting plate 13. The mounting block is located at the geometric center of the upper mounting plate, ensuring that the force transmission path is symmetrical and that the sensor can be installed in a centered position, which is the basis for ensuring measurement accuracy. For example, the sensor mounting block 12 can be fixed to the center of the upper mounting plate 13 by a rigid connection method such as bolt connection, welding or press fitting, ensuring the rigidity and stability of the entire upper structure.

[0073] Furthermore, the pull ring 11 passes through the sensor mounting block 12 and connects to the upper end of the sensor 40. The pull ring is a standard force transmission component, with its end connected to the upper end of the sensor. This fixes the upper end of the sensor 40 to the stationary upper mounting plate assembly 10, providing a reaction force fulcrum for applying tension to the linear loading device 50.

[0074] Furthermore, the upper guide shaft mounting seat 14 is fixed to both sides of the upper mounting plate 13. The two upper guide shaft mounting seats are symmetrically distributed on both sides of the upper mounting plate. This symmetrical layout is crucial for ensuring guiding accuracy, as it ensures that the constraint forces on the upper guide shaft 24 are balanced.

[0075] Thus, the upper mounting plate 13 serves as the base plate of the entire assembly, providing a rigid mounting platform for all other parts (mounting blocks, pull rings, guide shaft mounting seats). The sensor upper mounting block 12 and pull ring 11 located in the center ensure that the upper end of the sensor 40 is accurately positioned and firmly fixed, which is the primary prerequisite for the sensor to accurately measure pure axial tensile force.

[0076] In the bidirectional four-guide rod linear guide mechanism provided in this embodiment of the utility model, such as Figure 3 As shown, the mounting plate assembly 20 also includes a connecting sleeve 21; the connecting sleeve 21 is fixed to the center hole of the cross-shaped mounting plate 22, its upper part is connected to the lower end of the sensor 40, and its lower part is connected to the output end of the linear loading device 50.

[0077] In this embodiment of the invention, the force transmission path is as follows: the thrust generated by the linear loading device 50 → acts on the lower end of the connecting sleeve 21 → is transmitted upward through the connecting sleeve 21 → a portion of the thrust pushes the mounting plate 22 upward as a whole → another portion of the thrust acts directly on the lower end of the sensor 40, stretching it. Therefore, the connecting sleeve 21 is through which all forces from the actuator in this force flow path must pass.

[0078] Furthermore, since the connecting sleeve 21 is rigidly fixed to the center of the cross-shaped mounting plate 22, any torque attempting to twist or bend the bidirectional four-guide rod linear guide mechanism will first manifest as a twist on the mounting plate 22. This twist on the mounting plate 22 will be resisted and shared by the symmetrically arranged four guide rods (upper guide shaft 24 and lower guide shaft 33) and their bearings.

[0079] In this way, these harmful torques are confined and consumed within the rigid guide frame consisting of the central mounting plate and four guide rods, and cannot be transmitted upward to the sensor 40 through the connecting sleeve 21. As a result, the two ends of the sensor 40 always maintain a perfect alignment and only bear pure axial tension.

[0080] In the bidirectional four-guide rod linear guide mechanism provided in this embodiment of the utility model, such as Figure 4 As shown, the lower mounting plate assembly 30 includes a lower mounting plate 31; the linear loading device 50 is bolted to the middle hole of the lower mounting plate 31; the second linear bearing 32 is fixed to both sides of the lower mounting plate 31; and a limiting nut 34 is provided at the end of the lower guide shaft 33.

[0081] In this embodiment of the invention, the lower mounting plate assembly 30 includes a lower mounting plate 31. The lower mounting plate 31 is a structural platform used for mounting and securing all other parts within the assembly.

[0082] In addition, the linear loading device 50 is bolted to the middle hole of the lower mounting plate 31, ensuring that the force flow transmission path from bottom to top is always on the central axis of the mechanism, which is the basis for achieving force flow alignment and avoiding off-center loading.

[0083] In addition, the second linear bearing 32 is fixed to both sides of the lower mounting plate 31. These two linear bearings 32 constitute the fixed part of the second guide pair, providing a precise and smooth sliding track for the lower guide shaft 33 and constraining the movement of the middle mounting plate assembly in one of the horizontal directions.

[0084] In addition, a limiting nut 34 is provided at the end of the lower guide shaft 33. The limiting nut 34 is screwed on the thread at the end of the lower guide shaft 33. The core function of the limiting nut 34 is to mechanically limit the stroke. When the lower guide shaft 33 moves downward with the middle mounting plate assembly 20 (such as unloading or returning), the limiting nut 34 will eventually contact the bottom surface of the second linear bearing 32 or the lower mounting plate 31, thereby preventing the middle mounting plate assembly from falling further. This prevents the middle mounting plate assembly from moving excessively downward under the action of gravity and avoids the internal mechanisms (such as the connecting sleeve and the sensor threaded connection) from being subjected to unnecessary impacts or reaching mechanical limits and being damaged.

[0085] This provides the mounting base for the actuator, forms the precision guidance system of the lower part, and integrates mechanical overload protection functions, ensuring the centering and precise guidance of force flow, and ensuring that the bidirectional four-guide rod linear guide mechanism operates stably, reliably, and accurately under harsh working conditions.

[0086] In the bidirectional four-guide rod linear guiding mechanism provided in this embodiment of the utility model, the upper part of the connecting sleeve 21 is connected to the lower end of the sensor 40 by a thread, and the lower part is connected to the output end of the linear loading device 50 by a thread.

[0087] In this embodiment of the present invention, the upper part of the connecting sleeve 21 is threadedly connected to the lower end of the sensor 40, and the lower part is threadedly connected to the output end of the linear loading device 50. Specifically, the connecting sleeve 21 is connected to the sensor 40 and the linear loading device 50 using standard threads. Precision threads have high coaxiality requirements. Through precision machining, it can be ensured that the internal thread (or external thread) at the upper end of the connecting sleeve 21 and the internal thread (or external thread) at the lower end have extremely high coaxiality. This allows the lower end of the sensor 40 and the output end of the linear loading device 50 to naturally remain on the same axis after being screwed in, ensuring that the force flow is transmitted along the pure axial direction and avoiding the generation of lateral bending moment.

[0088] Furthermore, threaded connections inherently possess self-locking and anti-torsion properties. Once tightened, under immense axial tension, a tremendous frictional force is generated between the threaded pairs, effectively resisting the reverse torsional torque generated during operation.

[0089] In the bidirectional four-guide rod linear guide mechanism provided in this embodiment of the utility model, one set of two opposite holes on the middle mounting plate 22 of the cross-shaped structure is used to install the first linear bearing 23, and the other set is used to install the lower guide shaft mounting seat 25.

[0090] In this embodiment of the invention, one set of opposite holes on the cross-shaped mounting plate 22 is used to install the first linear bearing 23, and the other set is used to install the lower guide shaft mounting seat 25. The two sets of opposite holes on the cross-shaped mounting plate 22 respectively install the first linear bearing 23 and the lower guide shaft mounting seat 25, forming a symmetrical rigid support structure. Any lateral force and torsional moment generated by load imbalance or motion is shared and resisted by these four symmetrically arranged guide rods and their bearings. This layout ensures that harmful torques are confined within the guiding system, while the rigid force flow path between the central connecting sleeve 21 and the sensor 40 and the linear loading device 50, connected by precision threads, remains pure.

[0091] Ultimately, all non-axial forces are absorbed by the guiding mechanism, allowing only the purified axial tension to pass through the sensor, thus achieving high-precision and high-stability measurement under high-speed and high-load conditions.

[0092] In the bidirectional four-guide rod linear guide mechanism provided in this embodiment of the utility model, the mechanism is used for an aerial refueling docking simulation test bench. The first guide pair and the second guide pair work together to prevent the sensor 40 from being subjected to lateral force and torsional torque.

[0093] In this embodiment of the invention, the mechanism is used in an aerial refueling docking simulation test bench. The first and second guide pairs work together to prevent the sensor 40 from being subjected to lateral forces and torsional torques. Since the operation of the bidirectional four-guide rod linear guide mechanism begins with the activation of the linear loading device 50, when its output end is lifted upwards, the resulting thrust is concentrated and transmitted through the connecting sleeve 21: on the one hand, it directly acts on the lower end of the sensor 40, causing it to bear a precise axial tensile load; on the other hand, it pushes the cross-shaped central mounting plate 22 to produce an upward displacement tendency. At this time, the lower guide shaft 33, fixed to one side of the central mounting plate, rises with the assembly and slides precisely within the second linear bearing 32 of the lower mounting plate 31, constraining one degree of freedom in the horizontal direction; simultaneously, the upper guide shaft 24, fixed to the other side of the central mounting plate, moves synchronously, its shaft sliding within the upper guide shaft mounting seat 14 of the upper mounting plate 13, constraining another degree of freedom in the horizontal direction. The two sets of guide rod pairs together form an over-positioning constraint, strictly limiting the movement of the central mounting plate assembly to the vertical direction, ensuring that the two ends of the sensor remain precisely aligned throughout the loading process.

[0094] Through the specific implementation methods described above, this utility model embodiment achieves the following technical effects:

[0095] The bidirectional four-guide rod linear guiding mechanism provided by this utility model achieves precise linear motion constraint through the bidirectional four-guide rod mechanism, and combines a cross-shaped central connection structure to separate and optimize the power transmission path and the guiding constraint path, so that all non-axial forces are absorbed by the guiding mechanism, and only the purified axial tensile force acts on the sensor.

[0096] The bidirectional four-guide rod linear guide mechanism provided by this utility model solves the problem of decreased measurement accuracy and structural damage caused by torsion of the sensor under heavy load impact conditions through the design of the bidirectional four-guide rod linear guide mechanism and the cross-shaped central mounting plate. The bidirectional guide pair works together to eliminate lateral force and torsional torque, ensuring that the sensor only bears pure axial tensile force, improving the accuracy and reliability of measurement data, while enhancing the overall stability and service life of the equipment, and combining excellent functionality, safety and economy.

[0097] It should be noted that the order of the above embodiments of the present invention is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, the above description focuses on specific embodiments of this specification. Additionally, the processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0098] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0099] This specification and accompanying drawings are merely illustrative examples of this application and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Therefore, if such modifications and variations fall within the scope of this application and its equivalents, this application intends to include such modifications and variations.

Claims

1. A bidirectional four-bar linear guide mechanism, characterized by, It includes an upper mounting plate assembly (10), a middle mounting plate assembly (20), and a lower mounting plate assembly (30) arranged sequentially from top to bottom, as well as a sensor (40) connected between the upper mounting plate assembly (10) and the middle mounting plate assembly (20), and a linear loading device (50) connected between the middle mounting plate assembly (20) and the lower mounting plate assembly (30); The middle mounting plate assembly (20) includes a cross-shaped middle mounting plate (22); The upper mounting plate assembly (10) is symmetrically provided with upper guide shaft mounting seats (14); The middle mounting plate assembly (20) is symmetrically provided with a first linear bearing (23) and an upper guide shaft (24) that cooperate with the upper guide shaft mounting seat (14). The upper guide shaft (24) and the first linear bearing (23) slide to form a first guide pair. The lower mounting plate assembly (30) is symmetrically provided with a second linear bearing (32); The middle mounting plate assembly (20) is also symmetrically provided with a lower guide shaft mounting seat (25) and a lower guide shaft (33) that cooperate with the second linear bearing (32). The lower guide shaft (33) and the second linear bearing (32) slide to form a second guide pair. The spatial layout of the first guide pair and the second guide pair is perpendicular, which together constrains the middle mounting plate assembly (20) to only move in a straight line in the vertical direction.

2. The bidirectional four-bar linear guide mechanism according to claim 1, wherein The upper mounting plate assembly (10) includes an upper mounting plate (13), a sensor upper mounting block (12), and a pull ring (11); The sensor mounting block (12) is fixed to the center of the upper mounting plate (13); The pull ring (11) passes through the mounting block (12) on the sensor and is connected to the upper end of the sensor (40); The upper guide shaft mounting base (14) is fixed on both sides of the upper mounting plate (13).

3. The bidirectional four-bar linear guide mechanism according to claim 1, wherein The mounting plate assembly (20) further includes: Connecting sleeve (21); The connecting sleeve (21) is fixed at the center hole of the middle mounting plate (22) of the cross-shaped structure. Its upper part is connected to the lower end of the sensor (40), and its lower part is connected to the output end of the linear loading device (50).

4. The bidirectional four-guide rod linear guide mechanism according to claim 1, characterized in that, The lower mounting plate assembly (30) includes a lower mounting plate (31); The linear loading device (50) is bolted to the middle hole of the lower mounting plate (31); The second linear bearing (32) is fixed to both sides of the lower mounting plate (31); The lower guide shaft (33) is provided with a limiting nut (34) at its end.

5. The bidirectional four-guide rod linear guide mechanism according to claim 3, characterized in that, The upper part of the connecting sleeve (21) is connected to the lower end of the sensor (40) by a thread, and the lower part is connected to the output end of the linear loading device (50) by a thread.

6. The bidirectional four-guide rod linear guiding mechanism according to claim 1, characterized in that, The cross-shaped mounting plate (22) has two sets of opposite holes, one set for installing the first linear bearing (23) and the other set for installing the lower guide shaft mounting seat (25).

7. The bidirectional four-guide rod linear guiding mechanism according to claim 1, characterized in that, The mechanism is used for an aerial refueling docking simulation test bench, and the first guide pair and the second guide pair work together to prevent the sensor (40) from being subjected to lateral force and torsional torque.

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