Square structure AGV charging contact head

Abstract

The application relates to the technical field of AGV automatic charging equipment, and discloses a square structure AGV charging contact, which comprises a contact assembly, a shell assembly and a wire harness assembly, the shell assembly comprises a contact cover and an insulating cover plate, the contact cover and the insulating cover plate are connected with each other to form a mounting cavity, the square structure AGV charging contact is provided with a square plane contact structure and a non-cutting inclined surface, the overall size of the contact and the occupied mounting space are significantly reduced, the redundant structure reserved for considering multiple charging scenes is abandoned, the traditional standard contact is perfectly adapted to the compact vehicle body layout and the limited mounting space of a small and medium-sized AGV trolley. On the premise of meeting the large-current charging capacity, the amount of conductive material and the size of the shell structure are effectively reduced, the consumption of raw materials and the processing cost are reduced, the pain points of the existing standard large-current contact, such as large volume, high cost and incapability of being used for miniaturized AGVs, are solved, and the product economy and scene adaptability are improved.

Description

Technical Field

[0001] This invention relates to the field of AGV automatic charging equipment technology, specifically to a square-structured AGV charging contact. Background Technology

[0002] AGVs (Automated Guided Vehicles), as core transportation equipment in automated logistics, intelligent warehousing, and flexible production lines, are widely used in e-commerce sorting, manufacturing assembly, and workshop transfer scenarios, undertaking critical tasks such as material transportation and workstation docking. The charging contact is the core conductive component of the AGV automatic charging system, responsible for realizing the high-current power transfer between the charger and the AGV body. Its structural dimensions, contact stability, and conductivity directly determine the AGV's charging efficiency, operational reliability, and continuous operation time. With the development of small and medium-sized AGVs towards lightweight, compact, and highly flexible designs, more stringent requirements are being placed on the miniaturization, specialization, and high-current carrying capacity of the charging contact.

[0003] Existing AGV charging contacts mostly adopt a universal standard structure. To accommodate various charging methods such as side-entry and bottom-entry charging, the contacts are generally designed with a dedicated cutting bevel, resulting in large conductive copper material dimensions and a high degree of structural redundancy. While these standard contacts can meet the needs of medium and large AGVs under complex operating conditions and low positioning accuracy, their direct application to small and medium-sized AGVs leads to problems such as excessive size, mismatched installation space, and waste of materials and manufacturing costs. Furthermore, existing standard contacts are not optimized for the precise positioning and purely telescopic charging scenarios of small and medium-sized AGVs. The large size and redundant functions result in high space occupation and poor economic efficiency, failing to meet the charging requirements of small and medium-sized AGVs for high current (200A), small size, and low cost.

[0004] Therefore, a square-structured AGV charging contact is proposed to solve the aforementioned problems. Summary of the Invention

[0005] Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a square-structured AGV charging contact, which solves the problems of existing standard 200A charging contacts being too large, structurally redundant, and costly, unable to adapt to the compact installation space of small and medium-sized AGVs, and having excessive functions, low space utilization, and insufficient contact stability in precise positioning and telescopic charging scenarios.

[0006] Technical solution To achieve the above objectives, the present invention provides the following technical solution: A square-structured AGV charging contact includes a contact assembly, a housing assembly, and a wiring harness assembly. The housing assembly includes a contact cover and an insulating cover plate, which are connected to form a mounting cavity. The contact assembly is disposed inside the mounting cavity. The contact assembly has a square structure. An elastic component, which is a compression spring, is disposed between the contact assembly and the insulating cover plate. The elastic component abuts against both the contact assembly and the insulating cover plate. The wiring harness assembly is fixedly connected to the contact assembly for current conduction.

[0007] Preferably, the wire harness assembly includes a conductive terminal, a conductive cable, and a wiring terminal, wherein the conductive terminal and the conductive cable are connected by crimping, and the conductive cable and the wiring terminal are connected by crimping.

[0008] Preferably, a first locking component is provided between the conductive terminal and the contact assembly, the first locking component locking and fixing the conductive terminal and the contact assembly so that the conductive terminal and the contact assembly remain in contact.

[0009] Preferably, the first locking component is a countersunk screw, and the number of countersunk screws is four, which are evenly distributed along the circumference of the contact assembly.

[0010] Preferably, a first receiving groove is formed on the contact assembly, a second receiving groove is formed on the insulating cover plate, one end of the elastic member is placed in the first receiving groove, and the other end of the elastic member is placed in the second receiving groove.

[0011] Preferably, a second locking component is provided between the insulating cover and the contact cover, the second locking component passing through the insulating cover and the contact cover to fix the insulating cover and the contact cover as one unit.

[0012] Preferably, the second locking component is a countersunk screw, and there are four second locking components distributed around the edge of the insulating cover plate.

[0013] Preferably, the contact assembly is made of a conductive metal material, and a conductive plating layer is provided on the surface of the contact assembly.

[0014] Preferably, the contact assembly is a planar square contact structure, and the surface of the contact assembly does not have a cutting-in inclined surface. The contact assembly and the housing assembly together form a compact installation structure for telescopic charging scenarios of small and medium-sized AGVs.

[0015] Beneficial effects Compared with the prior art, the present invention provides a square-structured AGV charging contact, which has the following advantages: 1. This square-structured AGV charging contact utilizes a square planar contact structure with the elimination of the cut-in inclined surface, significantly reducing the overall size of the contact and the installation space occupied. It abandons the redundant structure reserved for multi-scenario charging in traditional standard contacts, perfectly adapting to the compact body layout and limited installation space of small and medium-sized AGVs. While meeting the high-current charging capacity, it effectively reduces the amount of conductive material used and the size of the housing structure, reducing raw material consumption and processing costs. This solves the pain points of existing standard high-current contacts being large, costly, and unsuitable for miniaturized AGVs, improving product economy and scenario adaptability.

[0016] 2. This square-structured AGV charging contact utilizes a double-slot positioning elastic component with axial telescopic guide design, ensuring that the elastic component does not shift, jam, or tip over during extension and retraction, maintaining a stable axial elastic force output at all times. When the contact contacts the AGV brush plate, it can automatically compensate for positioning errors, installation deviations, and contact surface gaps, achieving uniform contact across the entire plane. This significantly improves contact reliability and conductivity stability, effectively preventing problems such as incomplete connections, arcing, and localized overheating during charging, extending the service life of the contact and brush plate, and ensuring continuous, safe, and stable operation of high-current charging.

[0017] 3. This square-structured AGV charging contact utilizes an integrated crimped wire harness with graded countersunk screws for locking, creating a continuous, low-impedance conductive path between the conductive terminals, conductive cables, and wiring terminals. Multiple countersunk screws provide even tightening, ensuring low contact resistance, low temperature rise, and low loss in the high-current transmission path. Furthermore, the overall structure features a simple assembly process, robust connections, reliable insulation, and independent isolation between positive and negative terminals to prevent short circuits, enhancing protection and safety. This allows it to meet the high-frequency, high-intensity automatic charging needs of AGVs in scenarios such as automated warehousing and flexible production lines. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall exploded structure of a square-structured AGV charging contact proposed in this invention; Figure 2 This is a schematic diagram of the connection structure of a square-structured AGV charging contact housing assembly, contact assembly, and wire harness assembly proposed in this invention. Figure 3 This is a front view schematic diagram of the square structure AGV charging contact terminal block proposed in this invention; Figure 4 This is a schematic diagram of the bottom structure of a square-structured AGV charging contact housing assembly proposed in this invention; Figure 5 This is a schematic diagram of the bottom structure of the contact cover of a square-shaped AGV charging contact proposed in this invention; Figure 6This is a side view of a square-structured AGV charging contact housing assembly proposed in this invention. Figure 7 This is a schematic cross-sectional view of a square-structured AGV charging contact housing assembly proposed in this invention. Figure 8 This is a front view schematic diagram of the negative and positive electrode brush plates of a square-structured AGV charging contact proposed in this invention.

[0019] In the diagram: 1. Contact assembly; 2. Housing assembly; 3. Wiring harness assembly; 21. Contact cover; 22. Insulating cover; 4. Elastic component; 31. Conductive terminal; 32. Conductive cable; 33. Wiring terminal; 5. Countersunk screw one; 10. First receiving groove; 220. Second receiving groove; 6. Countersunk screw two; 8. Negative brush plate; 9. Positive brush plate. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1 - Figure 8 A square-structured AGV charging contact includes a contact assembly 1, a housing assembly 2, and a wiring harness assembly 3. The housing assembly 2 includes a contact cover 21 and an insulating cover 22, which are connected to form an installation cavity. The contact assembly 1 is disposed inside the installation cavity and has a square structure. An elastic component 4, which is a compression spring, is disposed between the contact assembly 1 and the insulating cover 22. The elastic component 4 abuts against the contact assembly 1 and the insulating cover 22 respectively. The wiring harness assembly 3 is fixedly connected to the contact assembly 1 for current conduction.

[0022] First, the wiring harness assembly 3 includes a conductive terminal 31, a conductive cable 32, and a wiring terminal 33. The conductive terminal 31 and the conductive cable 32 are connected by crimping, and the conductive cable 32 and the wiring terminal 33 are connected by crimping. Through the crimped integrated structure between the conductive terminal 31, the conductive cable 32, and the wiring terminal 33, a stable connection with no looseness, no loose connection, and low impedance is achieved in the conductive path, ensuring reliable transmission of 200A high current and avoiding problems such as poor contact, overheating, and arcing.

[0023] Secondly, a first locking component is provided between the conductive terminal 31 and the contact assembly 1. The first locking component locks and fixes the conductive terminal 31 and the contact assembly 1, keeping the conductive terminal 31 and the contact assembly 1 in contact. Through the pressing action of the first locking component on the conductive terminal 31 and the contact assembly 1, the conductive surfaces of the two are tightly attached, reducing the contact resistance and ensuring stable conductivity and reliable contact during high current charging.

[0024] Furthermore, the first locking component is a countersunk screw 5, and there are four countersunk screws 5, which are evenly distributed around the circumference of the contact assembly 1. By using four countersunk screws 5 evenly arranged around the circumference of the contact assembly 1, the force between the conductive terminal 31 and the contact assembly 1 is even and the clamping is complete, avoiding local warping or contact gaps, and improving the stability and safety of high current conduction.

[0025] Furthermore, a first receiving groove 10 is provided on the contact assembly 1, and a second receiving groove 220 is provided on the insulating cover plate 22. One end of the elastic member 4 is placed in the first receiving groove 10, and the other end of the elastic member 4 is placed in the second receiving groove 220. The elastic member 4 is bidirectionally positioned by the first receiving groove 10 of the contact assembly 1 and the second receiving groove 220 of the insulating cover plate 22, so that the elastic member 4 can extend and retract without deviation, jamming, or tipping over, ensuring that the elastic extension and retraction of the contact assembly 1 is smooth and reliable.

[0026] Furthermore, a second locking component is provided between the insulating cover plate 22 and the contact cover 21. The second locking component passes through the insulating cover plate 22 and the contact cover 21, fixing the insulating cover plate 22 and the contact cover 21 into one piece. The insulating cover plate 22 and the contact cover 21 are firmly connected by the second locking component to form a closed protective cavity, thereby achieving structural protection and electrical insulation for the internal contact assembly 1 and elastic component 4, and preventing short circuits and external damage.

[0027] Furthermore, the second locking component is a countersunk screw 6. There are four second locking components, which are distributed around the edge of the insulating cover plate 22. By using four countersunk screws 6 evenly arranged around the edge of the insulating cover plate 22, the connection strength between the insulating cover plate 22 and the contact cover 21 is high and the sealing performance is good, thereby improving the overall structural rigidity and dust protection capability.

[0028] Furthermore, the contact assembly 1 is made of conductive metal material, and a conductive plating layer is provided on the surface of the contact assembly 1. Through the highly conductive metal substrate and the conductive plating layer on the surface of the contact assembly 1, low contact resistance, high wear resistance and high corrosion resistance are achieved, ensuring that it still has a stable high current conductivity after long-term telescopic charging.

[0029] Finally, the contact assembly 1 is a planar square contact structure. The surface of the contact assembly 1 does not have a cutting-in inclined surface. The contact assembly 1 and the housing assembly 2 together form a compact installation structure, which is suitable for telescopic charging scenarios of small and medium-sized AGVs. By using the planar square contact assembly 1 without an inclined surface and the compact housing assembly 2, the overall size is small, the space occupied is small, and the cost is lower. It is perfectly adapted to the precise positioning telescopic charging of small and medium-sized AGVs and can stably meet the charging requirements of 200A high current.

[0030] Working principle: This square-structured AGV charging contact is designed specifically for the high-current charging scenarios of small and medium-sized AGVs with telescopic operation. Through the coordinated operation of four mechanisms—elastic contact compensation, stable conductive conduction, precise positioning and fitting, and safe insulation protection—it achieves safe and efficient charging with high current, low loss, and high reliability.

[0031] Before charging, the contact cover 21 and the insulating cover 22 are locked together by countersunk screws 26 to form a closed and rigidly stable mounting cavity, providing structural protection, axial limiting, and external insulation for the internal contact assembly 1, elastic component 4, and wiring harness connection parts. The insulating cover 22 is made of insulating engineering material, effectively blocking the electrical path between the live parts and the AGV body and charger structural components, avoiding safety risks such as short circuits and leakage during charging. One end of the elastic component 4 is precisely embedded in the first receiving groove 10 of the contact assembly 1, and the other end is embedded in the second receiving groove 220 of the insulating cover 22. Both ends are limited and constrained by the groove, preventing radial movement and skew. The whole is in a pre-compressed state, continuously applying a stable and uniform elastic extension force to the contact assembly 1, keeping the contact assembly 1 in a preset extension position, ready to respond to charging contact at any time. In the wiring harness assembly 3, the conductive terminal 31 is uniformly locked and tightly pressed onto the conductive mounting surface of the contact assembly 1 by countersunk screw 5 along the circumference, ensuring extremely low contact resistance during high current transmission. The conductive terminal 31 and the conductive cable 32, as well as the conductive cable 32 and the terminal 33, are all connected in an integrated rigid manner by a press-fitting process, with no welding breaks or loose gaps. A continuous, low-resistance, and reliable complete conductive path is formed from the charger to the contact assembly 1, which is in a standby ready state, waiting for the charging trigger signal.

[0032] During charging, the small and medium-sized AGV trolleys accurately navigate to the designated charging position on the charger using their own navigation and positioning systems. The positive and negative brush plates 9 and 8 installed on the trolleys are aligned precisely with the corresponding positive and negative contacts on the charger, creating conditions for stable physical contact. As the AGV trolley continues to move to the charging position, the brush plate plane smoothly presses against the contact assembly 1. The elastic component 4 is further and evenly compressed under pressure. The contact assembly 1 makes a small linear retraction movement along the cavity axis formed by the contact cover 21 and the insulating cover plate 22. Through elastic deformation, it automatically compensates for AGV positioning errors, installation deviations, and differences in the flatness of the contact surface, ensuring that the entire plane of the contact assembly 1 remains in close contact with the AGV brush plate throughout the process. The contact area is sufficient and the pressure is stable, fundamentally avoiding problems such as loose connections, arcing, and localized overheating. The charging current is stably transmitted along a fixed low-resistance path: charger output current → terminal 33 → conductive cable 32 → conductive terminal 31 → contact assembly 1 → AGV positive brush plate 9 or negative brush plate 8 → on-board battery system, achieving continuous, stable, and low-loss transmission of 200A high current, meeting the high-power fast charging needs of small and medium-sized AGVs. Simultaneously, the AGV on-board battery management system collects real-time signals of charging circuit voltage, operating current, and contact temperature, dynamically adjusting charging output parameters to limit overcurrent, overvoltage, and overheating risks, ensuring safety throughout the charging process. Contact assembly 1 adopts a pure planar square structure design, eliminating the traditional standard contact's inclined cut-in surface, thus no longer considering cut-in charging scenarios. This results in a smaller overall size and significantly reduced space occupation, perfectly adapting to the compact vehicle layout and purely telescopic charging conditions of small and medium-sized AGVs.

[0033] After charging is completed, the AGV receives the charging end signal and drives away from the charger. The contact pressure between the AGV brush plate and the contact assembly 1 completely disappears. The elastic component 4 quickly releases its elastic potential energy and rebounds smoothly along the axial direction, pushing the contact assembly 1 back to its initial extended standby state along the cavity. The elastic reset process is smooth and without jamming or deviation. After reset, the conductive connection of the contact assembly 1, the conductive terminal 31, the conductive cable 32, and the wiring terminal 33 remains intact. The insulation and protection of the housing assembly 2 remain unchanged. The overall structure immediately returns to the initial standby condition and can quickly respond to the next AGV return charging cycle, meeting the needs of continuous and high-frequency automated charging operations.

[0034] It should be noted that, in this document, 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.

Claims

1. A square-structured AGV charging contact, comprising a contact assembly (1), a housing assembly (2), and a wiring harness assembly (3), characterized in that: The housing assembly (2) includes a contact cover (21) and an insulating cover (22). The contact cover (21) and the insulating cover (22) are connected to each other to form an installation cavity. The contact assembly (1) is disposed inside the installation cavity. The contact assembly (1) has a square structure. An elastic component (4) is disposed between the contact assembly (1) and the insulating cover (22). The elastic component (4) is a compression spring. The elastic component (4) abuts against the contact assembly (1) and the insulating cover (22) respectively. The wire harness assembly (3) is fixedly connected to the contact assembly (1) to realize current conduction.

2. The AGV charging contact with a square structure according to claim 1, characterized in that: The wire harness assembly (3) includes a conductive terminal (31), a conductive cable (32) and a wiring terminal (33). The conductive terminal (31) and the conductive cable (32) are connected by crimping, and the conductive cable (32) and the wiring terminal (33) are connected by crimping.

3. The AGV charging contact with a square structure according to claim 2, characterized in that: A first locking component is provided between the conductive terminal (31) and the contact assembly (1). The first locking component locks and fixes the conductive terminal (31) and the contact assembly (1) so that the conductive terminal (31) and the contact assembly (1) remain in contact.

4. The AGV charging contact with a square structure according to claim 3, characterized in that: The first locking component is a countersunk screw (5), and there are four countersunk screws (5) that are evenly distributed around the contact assembly (1).

5. The AGV charging contact with a square structure according to claim 1, characterized in that: The contact assembly (1) has a first receiving groove (10), the insulating cover plate (22) has a second receiving groove (220), one end of the elastic member (4) is placed in the first receiving groove (10), and the other end of the elastic member (4) is placed in the second receiving groove (220).

6. The AGV charging contact with a square structure according to claim 1, characterized in that: A second locking component is provided between the insulating cover plate (22) and the contact cover (21). The second locking component passes through the insulating cover plate (22) and the contact cover (21) to fix the insulating cover plate (22) and the contact cover (21) into one piece.

7. A square-structured AGV charging contact according to claim 6, characterized in that: The second locking component is a countersunk screw (6), and there are four second locking components distributed around the edge of the insulating cover plate (22).

8. The AGV charging contact with a square structure according to claim 1, characterized in that: The contact assembly (1) is made of conductive metal material, and a conductive plating layer is provided on the surface of the contact assembly (1).

9. A square-structured AGV charging contact according to claim 1, characterized in that: The contact assembly (1) is a planar square contact structure. The surface of the contact assembly (1) is not provided with a cutting-in inclined surface. The contact assembly (1) and the housing assembly (2) together form a compact installation structure for telescopic charging scenarios of small and medium-sized AGVs.

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