Trolley chassis structure

Abstract

The utility model provides a trolley chassis structure which comprises a protective shell device of a metering device and a chassis body, universal wheels are installed below the chassis body, a blocking plate is installed above the chassis body, a rotating shaft is installed on the chassis body in a rotating mode, any end of the rotating shaft penetrates into a groove body formed in the chassis body in a rotating mode, and the other end of the rotating shaft penetrates into the groove body in a rotating mode. The worm gear is meshed with a worm fixedly mounted on a driving shaft, the driving shaft is rotatably mounted on the chassis main body, and a handle is fixedly mounted at any end of the driving shaft; lifting cams are fixedly mounted on the rotating shafts, and rollers are rotationally mounted on the lifting cams; the rotating handle is driven by the worm and the worm gear, the rotating shaft is driven to enable the lifting cam to lift plates, a forklift goods taking space is formed, and efficiency is improved. The blocking plate is matched with the mirror cam to achieve accurate positioning of the plate, sliding of the rollers is changed into rolling, friction and abrasion are reduced, and stability after lifting is guaranteed through worm and gear self-locking.

Description

TECHNICAL FIELD

[0001] The utility model belongs to handcart chassis technical field especially relates to a handcart chassis structure. BACKGROUND

[0002] In the field of industrial production and warehouse logistics, handcart is widely used as a basic handling tool, especially plays an important role in short-distance transportation of large objects such as boards. In the prior art, when it is necessary to use a forklift to take down the board on the handcart, the board is often closely attached to the handcart chassis, and the forklift arm is difficult to insert, resulting in inconvenient operation and low efficiency, and the board surface is easily damaged or the handcart structure is damaged during forced insertion. Some improved handcarts use simple jacking mechanisms to assist forklift operation, but have defects such as unstable jacking, inaccurate board positioning, and severe wear of parts, which cannot meet the efficient and safe operation requirements.

[0003] Therefore, it is necessary to invent a handcart chassis structure. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the above technical problems, the utility model provides a handcart chassis structure, which comprises a chassis body, universal wheels, a blocking plate, shafts, a groove body, a worm wheel, a worm, a drive shaft, a handle, lifting cams and rollers, four corners of the bottom of the chassis body are respectively fixedly installed with universal wheels, one side of the top of the chassis body is fixedly installed with a blocking plate, three equidistantly arranged shafts are rotationally installed on the chassis body, any end of each shaft is rotationally penetrated into the groove body provided in the chassis body, and the worm wheel provided in the groove body is fixedly connected with the shaft, the worm wheel is meshed with the worm fixedly installed on the drive shaft, the drive shaft is rotationally installed on the chassis body, and any end of the drive shaft is fixedly installed with a handle; two lifting cams are fixedly installed on each shaft, and the roller is rotationally installed on each lifting cam.

[0005] Preferably, the middle region of the chassis body is provided with a space for rotationally installing the shaft, the blocking plate is located on one side of one of the shafts, and the lifting cams fixedly installed on the three shafts do not interfere with each other.

[0006] Preferably, the worm wheel and the worm are located in the groove body, the space of the groove body allows the worm wheel and the worm to move, and the drive shaft allows the three shafts to synchronously and uniformly rotate through the worm and the worm wheel.

[0007] Preferably, the two ends of the shaft are respectively fixedly installed with lifting cams, the lifting cams on each shaft are mirror-symmetrically arranged, in the initial state, the convex part of the lifting cam faces downward, and the uppermost point of the convex part is lower than the upper surface of the chassis body.

[0008] Preferably, the roller is rotatably mounted on the protrusion of the lifting cam, and the protrusion of the lifting cam is provided with a slot for rotatably mounting the roller.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] This invention drives the drive shaft by rotating the handle, which in turn meshes the worm gear with the worm wheel, thereby synchronously driving the three rotating shafts to rotate. This enables the lifting cam to quickly lift the plate, creating a gap between the plate and the chassis that allows the forklift forks to easily insert, significantly improving the forklift's picking efficiency and reducing the intensity of manual operation.

[0011] The baffle plate on the chassis body of this utility model works in conjunction with the lifting cam arranged in a mirror symmetry. During the lifting process, the cam drives the plate to move towards the baffle plate and accurately position it, ensuring that the plate is in a fixed position when it is lifted, which facilitates the precise alignment of the forklift fork arm and avoids the risk of the plate tilting or falling.

[0012] The rollers mounted on the lifting cam protrusion of this utility model convert the sliding friction between the cam and the plate surface into rolling friction, effectively reducing friction and lowering the risk of scratches on the plate surface. At the same time, it reduces the wear of the cam during transmission and extends the service life of various components of the handcart chassis. The self-locking characteristics of the worm gear ensure the stability of the plate after it is lifted and prevent accidental reversal. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a partial cross-sectional structural diagram of the present invention.

[0015] Figure 3 This is a utility model Figure 2 A magnified schematic diagram of the structure at point A.

[0016] In the picture:

[0017] 1. Chassis body, 2. Casters, 3. Baffle plate, 4. Shaft, 5. Groove, 6. Worm gear, 7. Drive shaft, 8. Handle, 9. Lifting cam, 10. Roller. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 should fall within the protection scope of the present invention.

[0019] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0020] As attached Figure 1 To be continued Figure 3 As shown:

[0021] This utility model provides a handcart chassis structure, including a chassis body 1, casters 2, baffles 3, shafts 4, grooves 5, worm gears 6, worms 7, drive shafts 8, handles 9, lifting cams 10, and rollers 11. Casters 2 are fixedly installed at the four corners of the chassis body 1, and baffles 3 are fixedly installed on one side above it. Three equally spaced shafts 4 are rotatably mounted on the chassis body 1. Each end of each shaft 4 rotatably passes into the groove 5 of the chassis body 1 and is fixedly connected to the worm gear 6 within the groove 5. The worm gear 6 meshes with the worm 7 fixedly mounted on the drive shaft 8. The drive shaft 8 is rotatably mounted on the chassis body 1, and a handle 9 is fixedly mounted at one end. Two lifting cams 10 are fixedly mounted on each shaft 4, and rollers 11 are rotatably mounted on each lifting cam 10.

[0022] Furthermore, the chassis body 1 is integrally formed from Q235 high-strength steel plate, with a hollowed-out space in the middle area created by stamping for the rotatable mounting of the shaft 4. A self-lubricating copper sleeve is embedded within the hollowed-out space to reduce frictional resistance during shaft 4 rotation. The baffle plate 3 is made of 8mm thick aluminum alloy plate and is fixed to one edge of the chassis body 1 by welding, located to the side of one of the shafts 4. The three shafts 4 are machined from 45# steel and arranged laterally at equal intervals. The shafts 4 are rotatably connected to the chassis body 1 via tapered roller bearings. The lifting cams 10 fixedly mounted on each shaft 4 have their motion trajectories precisely planned using 3D modeling to ensure they do not interfere with each other during rotation.

[0023] Furthermore, the worm gear 6 is made of tin bronze, a material with excellent wear resistance, and is precision machined after casting. The worm 7 is made of 40Cr alloy steel, which is tempered and then surface-hardened to enhance its wear resistance and strength. Both the worm gear 6 and the worm 7 are located within the groove 5, which is formed by a downward indentation from the chassis body 1 and is secured with a sealing cover plate by bolts. The internal space of the groove 5 is precisely calculated to ensure that the worm gear 6 and the worm 7 have sufficient movement space during transmission. The groove 5 is also filled with lithium-based grease to reduce wear on the transmission components. The drive shaft 8 is also made of 45# steel, and its two ends are mounted on the chassis body 1 via deep groove ball bearings. The drive shaft 8 and the worm 7 are connected by a flat key, ensuring that when the drive shaft 8 rotates, it can drive the three rotating shafts 4 to rotate synchronously and in the same direction through the meshing transmission between the worm 7 and the worm gear 6.

[0024] Furthermore, each end of the rotating shaft 4 is fixedly mounted with a lifting cam 10 by high-strength bolts. The lifting cam 10 is made of ductile iron QT400-18 and is milled by a CNC machining center. The two lifting cams 10 on each rotating shaft 4 are arranged in a mirror symmetrical manner. In the initial state, the protrusion of the lifting cam 10 faces downward, and the highest point of the end opposite the protrusion is 50mm lower than the upper surface of the chassis body 1. This design ensures that the plate can be placed stably on the chassis body 1 when the lifting function is not in use.

[0025] Furthermore, the roller 11 is a deep groove ball bearing roller made of polyurethane-coated material, which has good wear resistance and shock absorption. The roller 11 is rotatably connected to the protrusion of the lifting cam 10 through a shaft core in the inner hole, and the two ends of the shaft core are fixed to the lifting cam 10 by snap rings. A U-shaped groove is pre-machined at the protrusion of the lifting cam 10, and the size of the groove is adapted to the shape of the roller 11 to ensure that the roller 11 can rotate flexibly in the groove. During the process of lifting the plate, when the roller 11 contacts the lower surface of the plate, the sliding friction is converted into rolling friction.

[0026] The working principle is as follows: First, in the initial state, the protrusions of the lifting cams 10 on the three rotating shafts 4 are all facing downwards, and the highest point of the end opposite to the protrusion is 50mm lower than the upper surface of the chassis body 1. The plate is placed stably on the chassis body 1. At this time, the plate is in full contact with the chassis body 1, and the chassis body 1 directly bears the weight of the plate.

[0027] When a forklift is needed to remove the sheet metal, the operator rotates the handle 9 mounted on one end of the drive shaft 8, causing the drive shaft 8 to rotate around its own axis. The rotation of the drive shaft 8 drives the worm gear 7 fixedly mounted on it to rotate synchronously. The worm gear 7 meshes with the worm wheel 6 in the groove 5. Due to the special transmission structure of the worm gear 7 and the worm wheel 6, the rotation of the three worm gears 7 can simultaneously drive the three worm wheels 6 to rotate synchronously in the same direction, thereby driving the three rotating shafts 4 fixedly connected to the worm wheels 6 to rotate synchronously in the same direction. The rotation of the rotating shaft 4 causes the lifting cams 10 fixedly mounted at both ends to rotate accordingly. Since the two lifting cams 10 on each rotating shaft 4 are arranged in a mirror symmetrical manner, and the protrusions of the lifting cams 10 are equipped with rollers 11, during the rotation of the lifting cams 10, the rollers 11 first contact the lower surface of the sheet metal, and as the lifting cams 10 continue to rotate, the rollers 11 roll on the lower surface of the sheet metal, gradually lifting the sheet metal.

[0028] During the lifting process, since the baffle plate 3 is located to the side of one of the rotating shafts 4, the plate will move towards the baffle plate 3 under the push of the roller 11 until it contacts the baffle plate 3 and is restricted by the baffle plate 3, thereby achieving precise positioning of the plate on the chassis body 1 and ensuring that the plate is in a position that the forklift fork arm can accurately align.

[0029] When the lifting cam 10 rotates to the position where the protrusion faces upward, the plate is fully lifted. At this time, a sufficient gap is formed between the plate and the chassis body 1, and the forklift fork arm can be easily inserted into the gap to complete the plate picking operation.

[0030] After the goods are picked up, the operator turns the handle 9 in the opposite direction, causing the drive shaft 8 to drive the worm gear 7 to rotate in the opposite direction. This, in turn, drives the rotating shaft 4 and the lifting cam 10 to rotate in the opposite direction through the worm wheel 6, until the lifting cam 10 returns to its initial state, i.e., the protrusion is facing down, ready for the next operation.

[0031] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A handcart chassis structure, characterized in that, The chassis body (1) includes casters (2), baffles (3), shafts (4), grooves (5), worm gears (6), worms (7), drive shafts (8), handles (9), lifting cams (10), and rollers (11). Casters (2) are fixedly installed at the four corners of the chassis body (1), and baffles (3) are fixedly installed on one side above it. Three shafts (4) are rotatably installed on the chassis body (1) at equal intervals, and each shaft (4) can rotate at any end. The worm gear (6) is inserted into the groove (5) of the chassis body (1) and fixedly connected to the worm wheel (6) in the groove (5). The worm wheel (6) meshes with the worm (7) fixedly installed on the drive shaft (8). The drive shaft (8) is rotatably installed on the chassis body (1), and a handle (9) is fixedly installed at either end. Two lifting cams (10) are fixedly installed on each of the shafts (4), and rollers (11) are rotatably installed on each of the lifting cams (10).

2. The handcart chassis structure as described in claim 1, characterized in that: The chassis body (1) has a space in the middle area for rotating shafts (4) to be installed. A baffle plate (3) is located on one side of one of the shafts (4). The lifting cams (10) fixedly installed on the three shafts (4) do not interfere with each other.

3. The handcart chassis structure as described in claim 2, characterized in that: The worm wheel (6) and worm (7) are located in the groove (5), and the space of the groove (5) allows the worm wheel (6) and worm (7) to move. The drive shaft (8) allows the three rotating shafts (4) to rotate synchronously and in the same direction through the worm (7) and worm wheel (6).

4. The handcart chassis structure as described in claim 3, characterized in that: Lifting cams (10) are fixedly installed at both ends of the rotating shaft (4). The lifting cams (10) on each rotating shaft (4) are arranged in a mirror symmetrical manner. In the initial state, the protrusion of the lifting cam (10) faces downward, and the uppermost point of the lifting cam (10) is lower than the upper surface of the chassis body (1).

5. The handcart chassis structure as described in claim 4, characterized in that: The roller (11) is rotatably mounted on the protrusion of the lifting cam (10), and the protrusion of the lifting cam (10) is provided with a slot for rotatably mounting the roller (11).

Images