AGV self-adjusting double-wheel casters

Abstract

This utility model discloses a self-adjusting dual-wheel caster for AGVs, belonging to the field of AGV technology. It includes a mounting base with a bracket rotatably connected to its bottom. Casters are symmetrically arranged on both sides of the bracket. A movable groove is formed at the bottom of the bracket, housing an automatic adjustment mechanism for the tire tread to contact the ground. The two casters are respectively mounted on the left and right sides of the self-adjusting mechanism. An auxiliary adjustment mechanism for resetting the self-adjusting mechanism is provided above it. This utility model, through its movable groove and free adjustment mechanism, allows the casters to automatically adjust their angle according to load changes, ensuring the tire tread remains in effective contact with the ground, enhancing grip and driving stability. The auxiliary adjustment mechanism utilizes the elasticity of a spring to ensure the free adjustment mechanism quickly returns to its original position, compensating for the reset delay problem inherent in purely mechanical automatic adjustment. Combining manual intervention with automatic adjustment improves system reliability.

Description

Technical Field

[0001] This utility model belongs to the field of AGV technology, specifically relating to AGV self-adjusting dual-wheel casters. Background Technology

[0002] AGV is an abbreviation for Automated Guided Vehicle. AGVs are transport vehicles equipped with electromagnetic or optical automatic guidance devices, enabling them to travel along a predetermined guidance path and providing safety protection and various transfer functions.

[0003] To ensure the smooth movement of AGV automated guided vehicles (AGVs) and timely delivery of production materials to the production area, AGVs are equipped with swivel casters. Since AGVs replace manual labor in transporting goods, they operate for long hours daily with frequent usage cycles. Therefore, the casters are required to be stable, have high load-bearing capacity, be easy to turn, move synchronously, and have a long service life.

[0004] However, the actual operating environment of AGVs in warehouse logistics is usually quite harsh, such as uneven ground with gravel, dust, iron filings, etc. When existing omnidirectional casters move on uneven ground, the tread cannot fully contact the ground, which affects the balance and stability of the AGV's movement. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a self-adjusting double-wheel caster for AGV.

[0006] The technical solution adopted to solve the above technical problems is: AGV self-adjusting double-wheel casters, including a mounting base, a bracket rotatably connected to the bottom end of the mounting base, casters symmetrically arranged on the left and right sides of the bracket, a movable groove opened at the bottom end of the bracket, a self-adjusting mechanism for automatically adjusting the tire surface of the casters to ground is provided in the movable groove, the two casters are respectively installed on the left and right sides of the self-adjusting mechanism, and an auxiliary adjustment mechanism for resetting the self-adjusting mechanism is provided above the self-adjusting mechanism;

[0007] The self-adjusting mechanism includes a support shaft, bearings, fixing bolts, fixing nuts, and screw holes.

[0008] Furthermore, a rotating hole is provided through the center of the front and rear walls of the support shaft. The bearing is sleeved on the outer wall of the fixing bolt and is located inside the rotating hole. The screw hole is provided through the front and rear walls of the movable groove. The side wall of the fixing bolt is threaded through the rotating hole and connected to the inner side wall of the screw hole. Both ends of the support shaft are provided with isolation sections. The isolation sections are located outside the movable groove. Threaded rods are symmetrically fixed to the opposite sides of the isolation sections on both sides. The side walls of the threaded rods are threaded with fixing nuts.

[0009] The above technical solution can automatically adjust the angle according to the load change to ensure that the tread is always in effective contact with the ground. On uneven ground or under heavy load, the tread of the caster is in contact with the ground, and the support shaft rotates in the movable groove with the fixed bolt as the fulcrum through the bearing. The rotation of the support shaft drives the threaded rods on both sides to tilt relative to each other, and the caster posture can be dynamically adjusted by tilting ±5 degrees to enhance grip and driving stability and reduce the risk of slippage.

[0010] Furthermore, the inner rings of the casters are all fitted onto the outer wall of the threaded rod, and one side of the casters is located between the isolation section and the fixing nut.

[0011] The above technical solution ensures that the casters can rotate freely, prevents lateral displacement, adapts to complex working conditions, and provides room for dynamic tilting of the casters, avoiding jamming when the casters come into contact with the bracket.

[0012] Furthermore, the auxiliary adjustment mechanism includes four movable holes evenly opened on the upper surface of the movable groove. The inner sidewalls of the movable holes are slidably connected to limit rods. The bottom end of the limit rod is fixed to a pressing plate. The outer sidewall of the limit rod is fitted with a spring. The spring is located between the top of the pressing plate and the top of the movable groove. The lower surface of the pressing plate is symmetrically provided with rotating grooves on the left and right sides. The inner sidewalls of the rotating grooves are rotatably connected to rollers.

[0013] Through the above technical solution, when the support shaft is dynamically tilted, the rollers are squeezed, pushing the pressing plate and the limiting rod to move upward. The rollers roll into contact with the support shaft, reducing friction and protecting the support shaft, reducing wear and increasing the service life of the support shaft. The movable hole limits the sliding of the limiting rod, while the spring is compressed. The spring uses its elasticity to automatically push the pressing plate to reset, making up for the reset delay problem in pure mechanical automatic adjustment. Combining manual intervention and automatic adjustment improves the reliability of the system.

[0014] Furthermore, the lower rolling surfaces of the rollers are all in contact with the top surface of the support shaft.

[0015] The above technical solution reduces friction and transmits force to the support shaft, helping the support shaft return to the correct position.

[0016] Furthermore, an oil injection nozzle is provided through the side wall of the rotatable connection between the mounting base and the bracket.

[0017] The above technical solution facilitates lubrication of the bearing rollers at rotating parts, ensuring smooth rotation of the caster wheel and extending its service life.

[0018] The beneficial effects of this utility model are as follows: (1) Through the set movable groove and free adjustment mechanism, the caster can automatically adjust the angle according to the load change, ensuring that the tire surface is always in effective contact with the ground, enhancing grip and driving stability, and reducing the risk of slipping; (2) Through the set auxiliary adjustment mechanism, the elasticity of the spring is used to ensure that the free adjustment mechanism returns to its position quickly, improving the efficiency of use, making up for the reset delay problem of pure mechanical automatic adjustment, and combining manual intervention and automatic adjustment to improve the reliability of the system. Attached Figure Description

[0019] Figure 1 This is a perspective view of the self-adjusting double-wheel caster of the AGV of this utility model;

[0020] Figure 2 This is a partial exploded view of the self-adjusting double-wheel caster of the AGV of this utility model;

[0021] Figure 3 This is a structural diagram of the auxiliary adjustment mechanism for the self-adjusting double-wheel casters of the AGV of this utility model;

[0022] Figure 4 yes Figure 1 Enlarged view of point A.

[0023] Reference numerals: 1. Mounting base; 2. Bracket; 3. Self-adjusting mechanism; 4. Caster; 5. Auxiliary adjustment mechanism; 201. Movable groove; 301. Support shaft; 3011. Rotating hole; 3012. Threaded rod; 3013. Isolation section; 302. Bearing; 303. Fixing bolt; 304. Fixing nut; 305. Screw hole; 501. Movable hole; 502. Pressing plate; 5021. Rotating groove; 503. Limiting rod; 504. Spring; 505. Roller. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] like Figures 1-4As shown, the AGV self-adjusting double-wheel caster of this embodiment includes a mounting base 1, with a bracket 2 rotatably connected to the bottom of the mounting base 1. The outer surfaces of both the mounting base 1 and the bracket 2 are galvanized to improve the corrosion resistance and service life of the structure, while also being aesthetically pleasing and environmentally friendly. An oil injection nozzle is connected through the side wall at the rotatable connection between the mounting base 1 and the bracket 2 to facilitate lubrication of the bearing rollers at the rotating part, ensuring smooth rotation of the caster and extending its service life. Casters 4 are symmetrically arranged on the left and right sides of the bracket 2. An active groove 201 is opened at the bottom of the bracket 2. An automatic adjustment mechanism 3 for the tread of the caster 4 to ground is provided in the active groove 201. The two casters 4 are respectively installed on the left and right sides of the self-adjusting mechanism 3. An auxiliary adjustment mechanism 5 for resetting the self-adjusting mechanism 3 is provided above the self-adjusting mechanism 3. Both the self-adjusting mechanism 3 and the auxiliary adjustment mechanism 5 adopt a split design, so that parts replacement or debugging does not require overall disassembly, reducing maintenance costs.

[0026] The self-adjusting mechanism 3 includes a support shaft 301, a bearing 302, a fixing bolt 303, a fixing nut 304, and a screw hole 305. A rotating hole 3011 is formed through the center of the front and rear walls of the support shaft 301. The bearing 302 is sleeved on the outer wall of the fixing bolt 303 and is located within the rotating hole 3011. The screw hole 305 is formed through the front and rear walls of the movable groove 201. The side wall of the fixing bolt 303 is threaded through the rotating hole 3011 and connected to the inner side wall of the screw hole 305. Isolation sections 3013 are provided at both ends of the support shaft 301, and these isolation sections 3013 are located outside the movable groove 201. Threaded rods 3012 are symmetrically fixed to the opposite sides of the isolation sections 3013 on both sides. Fixing nuts 304 are threadedly connected to the side walls of the threaded rods 3012. The inner rings of the casters 4 are all fitted with… Located on the outer wall of the threaded rod 3012, one side of the caster 4 is located between the isolation section 3013 and the fixing nut 304, ensuring that the caster 4 can rotate freely and preventing lateral displacement, adapting to complex working conditions, and providing space for the dynamic tilting of the caster 4, avoiding the caster 4 from contacting the bracket 2 and getting stuck when tilted. During use, the structure can automatically adjust the angle according to the load change to ensure that the tread is always in effective contact with the ground. On uneven ground or under heavy load, the tread of the caster 4 is in contact with the ground, and the support shaft 301 rotates in the movable groove 201 through the bearing 302 with the fixing bolt 303 as the fulcrum. The rotation of the support shaft 301 drives the threaded rods 3012 on both sides to tilt relative to each other, and the attitude of the caster 4 can be dynamically adjusted by tilting ±5 degrees, which enhances the grip and driving stability and reduces the risk of slippage.

[0027] The auxiliary adjustment mechanism 5 includes four movable holes 501 evenly spaced on the upper surface of the movable groove 201. Limiting rods 503 are slidably connected to the inner walls of each movable hole 501. A pressing plate 502 is fixedly connected to the bottom end of each limiting rod 503. A spring 504 is sleeved on the outer wall of each limiting rod 503, located between the top of the pressing plate 502 and the top of the movable groove 201. Rotating grooves 5021 are symmetrically arranged on the left and right sides of the lower surface of the pressing plate 502. Rollers 505 are rotatably connected to the inner walls of each rotating groove 5021. The lower rolling surfaces of the rollers 505 are in contact with the top surface of the support shaft 301 to reduce friction and simultaneously transmit force. The support shaft 301 assists in returning the support shaft 301 to the correct position. When the support shaft 301 is dynamically tilted, it squeezes the roller 505, pushing the pressing plate 502 and the limiting rod 503 to move upward. The roller 505 rolls into contact with the support shaft 301, reducing friction and protecting the support shaft 301, reducing wear and increasing the service life of the support shaft 301. The movable hole 501 slides and limits the limiting rod 503, while compressing the spring 504. The spring 504 uses its elasticity to automatically push the pressing plate 502 to reset, making up for the reset delay problem in pure mechanical automatic adjustment. Combining manual intervention and automatic adjustment improves the reliability of the system.

[0028] The working principle of this embodiment is as follows: During use, the mounting base 1 is fixed to the bottom of the transport vehicle with bolts. When the transport vehicle moves, the tread of the caster 4 rolls in contact with the ground. On uneven ground or under heavy load, the support shaft 301 rotates in the movable groove 201 through the bearing 302 with the fixing bolt 303 as the fulcrum. The rotation of the support shaft 301 drives the threaded rods 3012 on both sides to tilt relative to each other, which can dynamically adjust the attitude of the caster 4 by ±5 degrees, thereby enhancing grip and driving stability. At the same time, when the support shaft 301 tilts dynamically, it squeezes the roller 505, pushing the pressing plate 502 and the limit rod 503 to move upward. The movable hole 501 slides and limits the limit rod 503, while the spring 504 is compressed. The spring 504 uses its elasticity to automatically push the pressing plate 502 to reset, which makes up for the reset delay problem in pure mechanical automatic adjustment. Combining manual intervention and automatic adjustment improves the reliability of the system.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model.

Claims

1. An AGV self-adjusting double-wheel caster, including a mounting base (1), characterized in that: The bottom end of the mounting base (1) is rotatably connected to a bracket (2). Casters (4) are symmetrically provided on the left and right sides of the bracket (2). A movable groove (201) is provided at the bottom end of the bracket (2). A self-adjusting mechanism (3) for automatically adjusting the tire tread of the casters (4) to ground is provided in the movable groove (201). The two casters (4) are respectively installed on the left and right sides of the self-adjusting mechanism (3). An auxiliary adjustment mechanism (5) for resetting the self-adjusting mechanism (3) is provided above the self-adjusting mechanism (3). The self-adjusting mechanism (3) includes a support shaft (301), a bearing (302), a fixing bolt (303), a fixing nut (304), and a screw hole (305).

2. The AGV self-adjusting dual-wheel caster according to claim 1, characterized in that, The support shaft (301) has a rotating hole (3011) through the center of the front and rear walls. The bearing (302) is sleeved on the outer wall of the fixing bolt (303). The bearing (302) is located in the rotating hole (3011). The screw hole (305) is through the front and rear walls of the movable groove (201). The side wall of the fixing bolt (303) is threaded through the rotating hole (3011) and threaded to the inner side wall of the screw hole (305). The support shaft (301) has isolation sections (3013) at both ends. The isolation sections (3013) are located outside the movable groove (201). The opposite sides of the isolation sections (3013) on both sides are symmetrically fixed with threaded rods (3012). The side walls of the threaded rods (3012) are threaded with fixing nuts (304).

3. The AGV self-adjusting dual-wheel caster according to claim 1, characterized in that, The inner rings of the casters (4) are all fitted on the outer wall of the threaded rod (3012), and the casters (4) on one side are located between the isolation section (3013) and the fixing nut (304).

4. The AGV self-adjusting double-wheel caster according to claim 1, characterized in that, The auxiliary adjustment mechanism (5) includes four movable holes (501) evenly opened on the upper surface of the movable groove (201). The inner sidewalls of the movable holes (501) are slidably connected to limit rods (503). The bottom end of the limit rods (503) is fixedly connected to a pressing plate (502). The outer sidewall of the limit rods (503) is fitted with a spring (504). The spring (504) is located between the top of the pressing plate (502) and the top of the movable groove (201). The lower surface of the pressing plate (502) is symmetrically provided with rotating grooves (5021) on the left and right sides. The inner sidewalls of the rotating grooves (5021) are rotatably connected to rollers (505).

5. The AGV self-adjusting dual-wheel caster according to claim 4, characterized in that, The lower rolling surfaces of the rollers (505) are all in contact with the top surface of the support shaft (301).

6. The AGV self-adjusting dual-wheel caster according to claim 1, characterized in that, An oil injection nozzle is connected through the side wall of the rotating connection between the mounting base (1) and the bracket (2).

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