A support frame lifting assembly for a warehouse fork truck and a warehouse fork truck

Abstract

The application discloses a support frame lifting assembly of a warehouse forklift and the warehouse forklift, and relates to the technical field of logistics and warehousing. The warehouse forklift comprises a moving base, a moving support and a driving mechanism. The moving support comprises a support frame and a first support wheel installed on the support frame. The lifting assembly comprises a lifting rod and an engaging seat. The lifting rod can swing between a first position and a second position. The lifting rod is provided with an abutting portion. The engaging seat is provided with a clamping groove. When the support frame is retracted, the clamping groove and the abutting portion gradually approach from a position of mutual separation until the abutting portion abuts against the clamping groove and pushes the lifting rod to swing from the first position to the second position. When the support frame is in a retracted state, the lifting rod in the second position lifts the support frame through the engaging seat so that the first support wheel is separated from the ground. The lifting assembly can assist in supporting the moving support through the support wheel when the moving support is extended, and the support wheel is lifted in the air to avoid interference with the ground when the fork assembly is retracted.

Description

Technical Field

[0001] This application relates to the field of logistics and warehousing technology, and in particular to a support frame lifting assembly for a warehouse forklift and the warehouse forklift itself. Background Technology

[0002] Currently, intelligent warehouse forklifts are widely used in the warehousing and logistics industry, responsible for handling and transporting goods. In existing intelligent warehousing models, multiple racks are arranged inside the warehouse. Goods are placed on the racks via pallets. The warehouse forklift uses its forks to lift the pallets carrying goods, transports them to the target location, and then uses a lifting mechanism to move the forks up and down, placing the pallets at different storage positions on the racks. However, existing warehouse forklifts have significant shortcomings: when the forks are handling heavy goods, the forks extending to one side can cause the forklift's center of gravity to tilt to one side, posing a risk of tipping over. To address this issue, some existing technologies add counterweights to the rear of the vehicle. However, adding counterweights not only increases equipment costs but also increases the forklift's own weight, thus consuming more electricity and reducing its range. Other existing technologies provide auxiliary support to warehouse forklifts by simultaneously deploying a support structure when the forks extend. However, when the support structure is retracted, the support wheels are prone to colliding with ground obstacles, especially when the direction of travel of the warehouse forklift is perpendicular to the direction of fork extension and retraction. Direct contact between the support wheels and the ground can cause interference and affect the stability of the ride. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this application provides a support frame lifting assembly for a warehouse forklift, which can assist in supporting the moving support by means of support wheels when the fork assembly of the moving support is extended; and suspend the support wheels of the support assembly in the air when the fork assembly is retracted to avoid interference with the ground.

[0004] To achieve the above objectives, this application adopts the following technical solution: A support frame lifting assembly for a warehouse forklift includes a movable base, a movable bracket connected to the movable base, and a drive mechanism for driving the movable bracket to move laterally relative to the movable base. The movable bracket includes a support frame and a first support wheel mounted on the support frame. The support frame has an extended state relative to the movable base and a retracted state. The lifting assembly includes a lifting rod and a contact seat. The lifting rod is oscillatingly connected to one of the movable base and the support frame, allowing the lifting rod to swing between a first position and a second position. The contact seat is located on the other of the support frame and the movable base. The lifting rod has an abutment portion, and the contact seat has a groove that mates with the abutment portion. When the support frame moves from the extended state to the retracted state, the groove and the abutment portion gradually approach each other from their separated positions until they engage, pushing the lifting rod to swing from the first position to the second position. When the support frame is in the retracted state, the lifting rod in the second position lifts the support frame through the contact seat, causing the first support wheel to lift off the ground.

[0005] In the above technical solution, the lifting component can lift the support frame when it is in the retracted state, so that the first support wheel is off the ground, which facilitates the flexible movement of the mobile base; when the support frame is in the extended state, the lifting component releases the support frame and makes the first support wheel abut against the ground, sharing the load at the front end of the mobile support and improving the stability of operation.

[0006] The working principle of the lifting component in the above technical solution is as follows: When the support frame is in the extended state relative to the moving base, the slot and the abutment part are separated, and the lifting rod is in the first position. Under its own weight and load, the support frame makes the first support wheel stably abut against the ground, bearing part of the load, while preventing the forklift from tipping over due to the shift of the center of gravity. When the drive mechanism pushes the moving bracket to move laterally in the opposite direction relative to the moving base, the support frame switches from the extended state to the retracted state, the slot gradually approaches the abutment part, and after the two contact, the contact slot pushes the lifting rod from the first position to the second position. At this time, the lifting rod lifts the support frame synchronously through the cooperation of the slot and the abutment part, so that the first support wheel is off the ground. Then, the traveling mechanism of the moving base is activated, so that the warehouse forklift moves to the next target position. During the movement of the warehouse forklift, the support frame remains in the retracted state and the first support wheel is off the ground to avoid interference with ground obstacles and ensure driving stability. Once the forklift has moved to the next target position, the walking mechanism stops, and the drive mechanism starts moving again, pushing the mobile support to move laterally relative to the mobile base. The support frame switches from the retracted state to the extended state, and the contact seat pushes the lifting rod to swing from the second position to the first position. Then, the contact part separates from the slot, and the support frame falls under its own weight and load. The first support wheel touches the ground again, sharing the load at the front end of the mobile support and improving operational stability.

[0007] Preferably, the contact seat is provided on the support frame. The contact seat includes a protrusion that protrudes downward relative to the support frame. The protrusion has a vertical surface on the side facing the lifting rod, and the slot is provided above the vertical surface. When the slot contacts and abuts the abutting part, the abutting part abuts against the vertical surface. Alternatively, the contact seat is located on the movable base. The contact seat includes a protrusion that protrudes upward relative to the movable base. The protrusion has a vertical surface on the side facing the lifting rod, and the slot is located below the vertical surface. When the slot contacts and abuts the abutting part, the abutting part presses against the vertical surface.

[0008] Preferably, the lifting rod is disposed on the movable base, and the contact seat is disposed on the support frame. During the process of the lifting rod swinging from the first position to the second position: The distance between the contact portion and the ground increases progressively; Alternatively, the distance between the contact part and the ground increases first and then decreases, and the distance between the lifting rod and the ground in the second position is greater than the distance between the lifting rod and the ground in the first position.

[0009] Preferably, the lifting rod is mounted on the support frame, and the contact seat is mounted on the movable base. During the process of the lifting rod swinging from the first position to the second position: The distance between the lifting rod and the hinge axis of the support frame and the ground increases progressively. Alternatively, the distance between the lifting rod and the hinge axis of the support frame relative to the ground increases first and then decreases, and the distance between the lifting rod and the hinge axis relative to the ground in the second position is greater than the distance between the lifting rod and the hinge axis relative to the ground in the first position.

[0010] Preferably, the lifting rod includes a base rod and a telescopic rod. The base rod is oscillatingly connected to one of the movable base and the support frame. The telescopic rod is slidably disposed on the base rod, and the abutting part is disposed on the telescopic rod. A first elastic element is provided between the base rod and the telescopic rod so that the telescopic rod has a tendency to extend relative to the base rod. The first elastic element is configured as follows: When the support frame is in the retracted state and the load on the movable support is less than the preset value N, the pressure exerted by the weight of the movable support and its load on the telescopic rod is less than the elastic force of the first elastic element. The telescopic rod extends relative to the base rod, and the lifting rod lifts the support frame so that the first support wheel is lifted off the ground. When the support frame is in the retracted state and the load on the movable support is greater than the preset value N, the pressure exerted by the weight of the movable support and its load on the telescopic rod is greater than the elastic force of the first elastic element. The support frame pushes the telescopic rod to overcome the elastic force of the first elastic element and retract relative to the base rod. The support frame is in a low position and the first support wheel touches the ground.

[0011] Preferably, the contact seat is slidably connected to another of the support frame and the movable base, and a second elastic element is provided between the contact seat and the support frame or the movable base so that the contact seat has a tendency to move toward the lifting rod. The second elastic element is configured as follows: When the support frame is in the retracted state and the load on the movable support is less than the preset value N, the pressure exerted by the weight and load of the movable support on the contact seat is less than the elastic force of the second elastic element. The contact seat extends toward the lifting rod so that the lifting rod lifts the support frame and causes the first support wheel to leave the ground. When the support frame is in the retracted state and the load on the movable support is greater than the preset value N, the pressure exerted by the weight of the movable support and its load on the contact seat is greater than the elastic force of the second elastic element. The contact seat retracts away from the lifting rod and the first support wheel comes into contact with the ground.

[0012] Preferably, the sliding direction of the contact seat is perpendicular to the extension and retraction direction of the support frame; or, the angle between the sliding direction of the contact seat and the extension and retraction direction of the support frame is greater than 0°.

[0013] The above technical solution can ensure that the sliding of the contact seat can counteract the vertical component force generated by the swing of the lifting rod.

[0014] Preferably, the lifting rod is oscillatingly connected to the lifting seat and connected to the movable base or support frame through the lifting seat. The lifting seat is slidably connected to the movable base or support frame. A fourth elastic element is provided between the lifting seat and the movable base or support frame, giving the lifting seat a tendency to move towards the contact portion. The fourth elastic element is configured such that: when the support frame is in the retracted state and the load of the movable support is less than the preset value N, the pressure exerted by the weight of the movable support and its load on the lifting seat is less than the elastic force of the fourth elastic element, the lifting seat extends toward the abutment part, and the lifting rod lifts the support frame so that the first support wheel is off the ground; when the support frame is in the retracted state and the load of the movable support is greater than the preset value N, the pressure exerted by the weight of the movable support and its load on the lifting seat is greater than the elastic force of the fourth elastic element, the support frame pushes the lifting seat to overcome the elastic force of the fourth elastic element and retracts away from the abutment part, the support frame is in a low position, and the first support wheel abuts the ground.

[0015] Preferably, a third elastic element is provided between the lifting rod and the movable base or support frame to give the lifting rod a tendency to remain in the first position; the abutting part is a roller, which is rotatably connected to the lifting rod; the contact seat is fixed to the support frame and is integrally formed with the support frame.

[0016] A warehouse forklift includes the aforementioned lifting assembly, and further includes a movable base, a movable support connected to the movable base, and a drive mechanism for driving the movable support to move laterally relative to the movable base. The movable support includes a mast, a fork assembly that is liftably connected to the mast, a support assembly fixed to the mast, and a lifting mechanism for driving the fork assembly to lift relative to the mast. The fork assembly includes fork teeth for supporting and lifting goods. The support assembly includes a support frame and a first support wheel mounted on the support frame. The support frame has an extended state relative to the movable base and a retracted state. The fork teeth have a first bearing surface for supporting the goods, the movable base has a second bearing surface for supporting the goods, and the lifting mechanism drives the fork assembly to lift so that the fork teeth have a high-position interval, a critical interval and a low-position interval arranged sequentially from high to low. When the support frame is extended and the fork teeth are in the high position, the first bearing surface supports the goods, and the second bearing surface is detached from the goods. When the support frame is in the retracted state and the fork teeth are in the high position range, the first bearing surface supports the goods, and the second bearing surface is detached from the goods. When the support frame is in the retracted state and the fork teeth are in the low position range, the first bearing surface is detached from the goods, and the second bearing surface supports the goods.

[0017] In the above technical solution, the fork teeth have a high position interval, a critical interval and a low position interval arranged sequentially from high to low. By raising and lowering the fork teeth, the position of the goods being supported can be changed. When the support frame is in the retracted state, the goods can be smoothly transferred from the first bearing surface to the second bearing surface. The goods are supported by the moving base, thereby turning the fork assembly into an unloaded state.

[0018] Preferably, the end of the support assembly away from the first support wheel is fixed to the gantry, and the bottom of the gantry abuts against the movable base through a support roller, so that the movable bracket can swing relative to the movable base around the support roller. Alternatively, the movable support may further include a support plate that is laterally slidably connected to the movable base, the bottom of the gantry being rotatably connected to the support plate, and the end of the support assembly away from the first support wheel being fixed to the gantry. This allows the gantry and support components to swing relative to the movable base around a pivot point at the bottom of the gantry; Alternatively, the movable support can be slidably mounted on the movable base, and the movable base is provided with a guide structure. The gantry forms a sliding fit with the movable base through the guide structure. When the movable support slides up and down, the drive mechanism always maintains a lateral driving effect on the movable support.

[0019] Preferably, the movable support moves relative to the movable base in the left-right direction. The bottom of the movable base is provided with several universal support wheels and two drive wheels spaced apart on the left and right. The axle of the drive wheels extends in the left-right direction. There are two support components, which are spaced apart on opposite sides of the mast. The fork assembly is located between the two support components. The support component also includes a vertical frame integrally formed with the support frame. The vertical frame is perpendicular to the support frame and vertically fixed to the mast. A support bar is inclinedly arranged between the support frame and the vertical frame. The two ends of the support bar are fixed to the support frame and the vertical frame respectively. The support frame, the vertical frame, and the support bar form a triangular support structure. The movable base is provided with a limiting structure to restrict the lateral position of the movable support.

[0020] Preferably, the movable base is provided with a receiving groove for accommodating the fork teeth, which are stored in the receiving groove when the fork teeth descend.

[0021] Preferably, the fork assembly further includes a front and rear telescopic mechanism, wherein the fork teeth are connected to the telescopic end of the front and rear telescopic mechanism to drive the fork teeth to extend or retract, and the lifting mechanism is used to drive the front and rear telescopic mechanism to lift.

[0022] In the above technical solution, compared with the fixed-length fork structure, this telescopic design can improve operational flexibility without increasing the overall size of the equipment, enabling the warehouse forklift to adapt to rack layouts with different spacing and reducing the equipment's occupation of warehouse space. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this application. Figure 1 ; Figure 2 This is a schematic diagram of the structure when the support frame is extended in this application; Figure 3 This is a schematic diagram of the structure when the support frame is retracted in this application; Figure 4 This is a schematic diagram of the structure of the support frame when it is lifted by the lifting component in this application; Figure 5 This is a schematic diagram of the structure of this application. Figure 2 ; Figure 6 This is a schematic diagram of the fork assembly in this application supporting cargo. Figure 7 yes Figure 3 A magnified view of a section at point A in the middle; Figure 8 yes Figure 4 A magnified view of a section at point B in the middle; Figure 9 yes Figure 6 A magnified view of a section at point C; Figure 10This is a partial structural diagram of this application. Figure 1 ; Figure 11 This is a partial structural diagram of this application. Figure 2 ; Figure 12 This is a partial structural diagram of this application. Figure 3 ; Figure 13 This is a partial structural diagram of this application. Figure 4 Figure 14 This is a partial structural diagram of this application. Figure 5 .

[0024] In the figure: movable base 1, second bearing surface 11, receiving groove 12, movable bracket 2, mast 21, fork assembly 22, fork teeth 221, first bearing surface 2211, support assembly 23, support frame 231, first support wheel 232, upright 233, support bar 234, lifting mechanism 24, support roller 25, drive mechanism 3, lifting assembly 4, lifting rod 41, abutment part 411, base rod 412, telescopic rod 413, contact seat 42, slot 421, protrusion 422, vertical surface 423, first elastic element 43, second elastic element 44, lifting seat 45, fourth elastic element 46. Detailed Implementation

[0025] The present application will now be further described with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1 to 6 As shown, a warehouse forklift includes a movable base 1, a lifting assembly 4, a movable support 2 connected to the movable base 1, and a drive mechanism 3 for driving the movable support 2 to move laterally relative to the movable base 1. The movable support 2 includes a mast 21, a fork assembly 22 that is liftably connected to the mast 21, a support assembly 23 fixed to the mast 21, and a lifting mechanism 24 for driving the fork assembly 22 to move up and down relative to the mast 21. The fork assembly 22 includes fork teeth 221 for supporting and lifting goods. The support assembly 23 includes a support frame 231 and a first support wheel 232 mounted on the support frame 231. The support frame 231 has an extended state relative to the movable base 1 and a retracted state relative to the movable base 1.

[0027] In this application, the mobile base 1 is equipped with a walking mechanism that enables the forklift to move on the ground. The walking mechanism includes drive wheels connected to a motor to provide propulsion. The walking direction of the walking mechanism is perpendicular to the lateral movement direction of the mobile support 2, ensuring that the forklift can move flexibly within the aisle while the support assembly 23 can stably extend and retract to adapt to different shelf positions. Because the walking direction of the walking mechanism is perpendicular to the lateral movement direction of the mobile support 2, if the support frame 231 does not rise and the first support wheel 232 touches the ground while the walking mechanism is moving, interference will occur between the first support wheel 232 and the ground, affecting the normal movement of the mobile base 1. Therefore, before starting the walking mechanism, it is necessary to switch from the first position to the second position to lift the first support wheel 232 off the ground. In this application, the walking mechanism, lifting mechanism 24, and drive mechanism 3 can all adopt corresponding mechanisms commonly used in the art, capable of respectively realizing walking, lifting, and lateral movement functions, and the mechanisms are linked and coordinated through a control system.

[0028] Example 1: like Figures 1 to 14 As shown, a support frame lifting assembly for a warehouse forklift includes a lifting rod 41 and a contact seat 42. The lifting rod 41 is oscillatingly connected to one of a movable base 1 and a support frame 231, allowing the lifting rod 41 to swing between a first position and a second position. The contact seat 42 is located on the other of the support frame 231 and the movable base 1. The lifting rod 41 has an abutment portion 411, and the contact seat 42 has a groove 421 that mates with the abutment portion 411. When the support frame 231 moves from an extended state to a retracted state, the groove 421 and the abutment portion 411 gradually approach each other from their separated positions until they contact each other, pushing the lifting rod 41 to swing from the first position to the second position. When the support frame 231 is in the retracted state, the lifting rod 41 in the second position lifts the support frame 231 through the contact seat 42, causing the first support wheel 232 to lift off the ground.

[0029] In the above technical solution, the lifting component 4 can lift the support frame 231 when it is in the retracted state, so that the first support wheel 232 is off the ground, making it easier for the mobile base 1 to move flexibly; when the support frame 231 is in the extended state, the lifting component 4 releases the support frame 231 and makes the first support wheel 232 abut against the ground, sharing the load at the front end of the mobile support 2 and improving the stability of operation.

[0030] The working principle of the lifting component 4 in the above technical solution is as follows: When the support frame 231 is in the extended state relative to the movable base 1, the slot 421 and the abutment part 411 are separated from each other, the lifting rod 41 is in the first position, and the support frame 231, under its own weight and load, makes the first support wheel 232 stably abut against the ground, bearing part of the load, while preventing the forklift from tipping over due to the shift of the center of gravity; when the drive mechanism 3 pushes the movable bracket 2 to move laterally in the opposite direction relative to the movable base 1, the support frame 231 switches from the extended state to the retracted state, the slot 421 gradually approaches the abutment part 411, and after the two contact, the contact seat 42 pushes the lifting rod 41 to swing from the first position to the second position. At this time, the lifting rod 41 lifts the support frame 231 synchronously through the cooperation of the slot 421 and the abutment part 411, so that the first support wheel 232 leaves the ground. Then, the walking mechanism of the movable base 1 is started, so that the warehouse forklift moves to the next target position. During the movement of the warehouse forklift, the support frame 231 remains retracted and the first support wheel 232 is off the ground to avoid interference with ground obstacles and ensure stable driving. When the warehouse forklift has moved to the next target position, the traveling mechanism stops, and the drive mechanism 3 actuates again, pushing the moving bracket 2 to move laterally relative to the moving base 1. The support frame 231 switches from the retracted state to the extended state, and the contact seat 42 pushes the lifting rod 41 to swing from the second position to the first position. Then, the abutment part 411 separates from the slot 421, and the support frame 231 falls under its own weight and load. The first support wheel 232 re-applies to the ground, sharing the load at the front end of the moving bracket 2 and improving operational stability.

[0031] Preferably, a third elastic element is provided between the lifting rod 41 and the movable base 1 or the support frame 234, so that the lifting rod 41 tends to be held in the first position; the abutting part 411 is a roller, and the roller is rotatably connected to the lifting rod 41; the contact seat 42 is fixed to the support frame 234 and is integrally formed with the support frame 231.

[0032] In the above technical solution, the lifting rod 41 is stably held in the first position under the action of the third elastic element. When the lifting rod 41 disengages from the contact seat 42, it can automatically return to the first position, ensuring that the slot 421 and the abutment part 411 can accurately re-engage when the support frame 231 retracts next time, and thus push the lifting rod 41 to move, thereby improving the stability of the mechanism's movement. The abutment part adopts a roller structure, which can effectively reduce the frictional resistance between the abutment part and the contact seat 42, making the swing of the lifting rod 41 smoother.

[0033] Example 2: like Figures 1 to 9As shown, based on Embodiment 1, the lifting rod 41 is disposed on the movable base 1, and the contact seat 42 is disposed on the support frame 231. The contact seat 42 includes a protrusion 422 that protrudes downward relative to the support frame 231. The protrusion 422 has a vertical surface 423 on the side facing the lifting rod 41, and the slot 421 is disposed above the vertical surface 423. When the slot 421 contacts and abuts the contact part 411, the contact part 411 abuts against the vertical surface 423.

[0034] In the above technical solution, the vertical surface 423 can provide a lateral thrust to the abutment portion 411 when the support frame 231 retracts, ensuring that the lifting rod 41 is stably stressed during the swinging process and overcoming the jamming resistance during lifting. Through the cooperation of the slot 421 and the abutment portion 411, the two can reliably connect after contact. When the support frame 231 extends, after the lifting rod 41 swings to the first position, the slot 421 and the abutment portion 411 can smoothly disengage. In this embodiment, the vertical surface 423 can be perpendicular to the ground or inclined at a small angle relative to the ground, as long as sufficient lateral thrust is transmitted when the abutment portion 411 contacts the vertical surface 423.

[0035] Understandably, in one embodiment, as the lifting rod 41 swings from the first position to the second position, the distance between the contact portion 411 and the ground increases. In the above technical solution, the ground refers to the reference surface where the warehouse forklift operates; it can be a horizontal surface or an inclined surface, as long as the reference surface remains relatively stable. When the lifting rod 41 swings from the first position to the second position, the contact portion 411 continuously abuts against the groove 421 of the contact seat 42, generating an upward lifting force. As the swing angle increases, the distance between the contact portion 411 and the ground increases, thereby driving the contact seat 42 and the support frame 231 fixed thereto to rise synchronously, so that the first support wheel 232 can smoothly leave the ground.

[0036] Understandably, in another embodiment, during the swinging process of the lifting rod 41 from the first position to the second position, the distance between the abutment portion 411 and the ground first increases and then decreases, and the distance between the lifting rod 41 and the ground in the second position is greater than the distance between the lifting rod 41 and the ground in the first position. In the above technical solution, the ground refers to the reference plane where the warehouse forklift operates, which can be a horizontal plane or an inclined plane, as long as the reference plane remains relatively stable, it can be used as a reference. When the lifting rod 41 swings in the vertical plane, the state with the largest distance from the ground is when the lifting rod 41 is perpendicular to the ground. During the swing of the lifting rod 41 from the first position to the second position, the distance between the contact part 411 and the ground first increases and then decreases. Essentially, through the design of the swing trajectory, the contact seat 42 and the support frame 231 are driven to simultaneously achieve a rapid initial lift followed by a slight downward movement. The initial stage of increasing distance quickly lifts the support frame 231 off the ground, while the later stage of decreasing distance uses the weight of the support frame 231 itself to bring it back to the stable second position. At this point, the weight of the support frame 231 creates a reverse resistance torque on the lifting rod 41. If it is necessary to drive the support frame 231 from the retracted state to the extended state, the... The moving mechanism 3 needs to overcome the resistance torque to form a reliable mechanical self-locking effect, effectively preventing the support frame 231 from accidentally extending due to vibration or external disturbance during travel; and the lifting rod 41 is still farther from the ground in the second position than in the first position, which ensures that the support frame 231 is always in the raised state and the first support wheel 232 is completely off the ground. It also eliminates the need for an additional locking mechanism through the mechanical self-locking principle, which simplifies the structure and improves the safety and stability of the warehouse forklift during movement. Regardless of whether the reference plane is a horizontal plane or a slightly inclined ground, the above effects can be achieved by relying on a relatively stable reference.

[0037] Example 3: Based on Example 1, such as Figure 10 As shown, the lifting rod 41 is mounted on the support frame 231, and the contact seat 42 is mounted on the movable base 1. The contact seat 42 includes a protrusion 422 that protrudes upward relative to the movable base 1. The protrusion 422 has a vertical surface 423 on the side facing the lifting rod 41, and a slot 421 is located below the vertical surface 423. When the slot 421 contacts and abuts the contact part 411, the contact part 411 abuts against the vertical surface 423.

[0038] In the above technical solution, the vertical surface 423 can provide a lateral thrust to the abutment portion 411 when the support frame 231 retracts, ensuring that the lifting rod 41 is stably stressed during the swinging process and overcoming the jamming resistance during lifting. Through the cooperation of the slot 421 and the abutment portion 411, the two can reliably connect after contact. When the support frame 231 extends, after the lifting rod 41 swings to the first position, the slot 421 and the abutment portion 411 can smoothly disengage. In this embodiment, the vertical surface 423 can be perpendicular to the ground or inclined at a small angle relative to the ground, as long as sufficient lateral thrust is transmitted when the abutment portion 411 contacts the vertical surface 423.

[0039] Understandably, in one embodiment, the distance between the lifting rod 41 and the hinge axis of the support frame 231 relative to the ground increases progressively. In the above technical solution, the ground refers to the reference surface where the warehouse forklift operates; it can be a horizontal surface or an inclined surface, as long as the reference surface remains relatively stable. When the lifting rod 41 swings from the first position to the second position, its abutting part 411 engages with the slot 421 of the contact seat 42. As the swinging motion continues, the distance between the lifting rod 41 and the hinge axis of the support frame 231 relative to the ground increases progressively, thereby driving the entire support frame 231 to rise synchronously through transmission, achieving smooth lifting of the first support wheel 232 off the ground.

[0040] Understandably, in another embodiment, the lifting rod 41 is mounted on the support frame 231, and the contact seat 42 is mounted on the movable base 1. During the swinging process of the lifting rod 41 from the first position to the second position, the distance between the contact portion 411 and the ground first increases and then decreases, and the distance between the lifting rod 41 and the ground in the second position is greater than the distance in the first position. In the above technical solution, the ground refers to the reference plane where the warehouse forklift operates. It can be a horizontal plane or an inclined plane, as long as the reference plane remains relatively stable. When the lifting rod 41 swings in the vertical plane, the state with the greatest distance from the ground is when the lifting rod 41 is perpendicular to the ground. The configuration of the lifting rod 41 mounted on the support frame 231 and the contact seat 42 fixed on the movable base 1 ensures that the contact seat 42 maintains a constant height during operation. When the lifting rod 41 swings from the first position to the second position, its abutment part 411 engages with the slot 421 of the contact seat 42. As the swinging motion continues, the distance between the lifting rod 41 and the hinge axis of the support frame 231 relative to the ground first increases and then decreases, thereby causing the support frame 231 to first rise rapidly and then fall slightly back to a stable position. In the second position, the initial increasing distance phase of the swing allows the support frame 231 to be quickly lifted off the ground, while the subsequent decreasing distance phase utilizes the weight of the support frame 231 to create a stable limit. At this time, the weight of the support frame 231 will generate a reverse resistance torque on the lifting rod 41. If the support frame 231 needs to be switched from the retracted state to the extended state, the drive mechanism 3 needs to overcome this resistance torque, thus forming a reliable mechanical self-locking effect, effectively preventing the support frame 231 from accidentally extending due to vibration or external disturbance during travel. In the second position, the distance between the hinge shaft and the ground of the lifting rod 41 is still greater than that in the first position. This design ensures that the support frame 231 is always in the raised state and the first support wheel 232 is completely off the ground. It also eliminates the need for an additional locking mechanism through the mechanical self-locking principle. This simplifies the structure while improving the safety and stability of the warehouse forklift during movement. Regardless of whether the reference plane is horizontal or slightly inclined, the above effects can be achieved by relying on a relatively stable reference.

[0041] Example 4: Based on Example 1, such as Figures 7 to 10 As shown, the lifting rod 41 includes a base rod 412 and a telescopic rod 413. The base rod 412 is sway-connected to one of the movable base 1 and the support frame 231. The contact seat 42 is provided in the other of the movable base 1 and the support frame 231. The telescopic rod 413 is slidably provided on the base rod 412. The abutment part 411 is provided on the telescopic rod 413. A first elastic member 43 is provided between the base rod 412 and the telescopic rod 413 so that the telescopic rod 413 has a tendency to extend relative to the base rod 412. The first elastic element 43 is configured as follows: When the support frame 231 is in the retracted state and the load of the movable support 2 is less than the preset value N, the pressure exerted by the weight of the movable support 2 and its load on the telescopic rod 413 is less than the elastic force of the first elastic element 43. The telescopic rod 413 extends relative to the base rod 412, and the lifting rod 41 lifts the support frame 231 so that the first support wheel 232 is lifted off the ground. When the support frame 231 is in the retracted state and the load on the movable support 2 is greater than the preset value N, the pressure exerted by the weight and load of the movable support 2 on the telescopic rod 413 is greater than the elastic force of the first elastic element 43. The support frame 231 pushes the telescopic rod 413 to overcome the elastic force of the first elastic element 43 and retract relative to the base rod 412. The support frame 231 is in a low position and the first support wheel 232 touches the ground.

[0042] In this embodiment, the preset value N can be set according to actual needs, and the response to different loads can be achieved by adjusting the stiffness or preload of the first elastic element 43. In this application, the preset value N can be 0 kg, that is, when the moving support 2 is unloaded and the support frame 231 is in the retracted state, the elastic force of the first elastic element 43 can drive the telescopic rod 413 to extend, lifting the support frame 231 and lifting the first support wheel 232 off the ground; as long as the fork assembly 22 is carrying goods, the weight of the goods is greater than the preset value 0 kg, and the support frame 231 will overcome the elastic force of the first elastic element 43 and descend under the action of the weight of the goods, so that the first support wheel 232 will re-abut the ground, realizing adaptive switching. In this application, since the elasticity of the first elastic element 43 changes during deformation, the preset value N in this application can be a small range value, rather than a single fixed value. In practical applications, if the weight of the goods is within the critical range of the preset value N, the first elastic element 43 is in a partially deformed state. Since the load is small at this time, the impact on the stability of the goods is limited. After the subsequent action places the goods on the movable base 1, the first support wheel 232 can still be fully lifted.

[0043] In the above technical solution, through the reasonable configuration of the elastic force of the first elastic element 43, the grounding state of the support frame 231 can be automatically adjusted under different load conditions, thereby realizing flexible movement of the equipment under light load and stable support under heavy load. Since the elastic element does not have the ability to actively switch states, its response depends entirely on the mechanical balance relationship caused by load changes. Therefore, the system always operates in a passive adaptive manner without the need for additional control intervention.

[0044] When the load on the movable support 2 is less than the preset value N, the load on the movable support 2 has little impact on the vehicle's stability. During the process of the support frame 231 switching from the extended state to the retracted state, when the slot 421 and the abutment part 411 are not in contact, the telescopic rod 413 remains in the extended state. However, because the load on the fork assembly 22 is insufficient to overcome the elastic force of the first elastic element 43, the slot 421 and the abutment part 411 gradually approach each other until they come into contact. At this point, the contact seat 42 pushes the lifting rod 41 to swing from the first position to the second position. Under the support of the first elastic element 43, the length of the lifting rod 41 remains unchanged, and it only swings relative to each other. The lifting rod 41 lifts the support frame 231, causing the first support wheel 232 to leave the ground. After the first support wheel 232 leaves the ground, the traveling mechanism of the movable base 1 can drive the entire warehouse forklift to move, and the first support wheel 232 will not interfere with the movement.

[0045] When the load on the movable support 2 exceeds the preset value N, the load on the movable support 2 has a significant impact on the vehicle body stability. During the retraction process of the support frame 231, when the slot 421 and the abutment part 411 are not in contact, the telescopic rod 413 initially remains extended. Since the total weight of the movable support 2 and its load exert pressure on the lifting rod 41, it is sufficient to overcome the elastic force of the first elastic element 43. When the slot 421 and the abutment part 411 gradually approach each other until they come into contact, the contact seat 42 pushes the lifting rod 41 to swing from the first position to the second position. During this process, the telescopic rod 413 overcomes the elastic force of the first elastic element 43. The elastic force retracts relative to the base rod 412, and the retraction of the base rod 412 causes the overall length of the lifting rod 41 to shorten. Thus, during the retraction of the support frame 231, the height of the support frame 231 remains unchanged, and the first support wheel 232 remains in contact with the ground. This prevents the entire movable support 2 from shaking under heavy load due to the lifting of the support frame 231. Furthermore, since the support frame 231 is not lifted during the retraction process, the drive mechanism 3 does not need to provide additional driving force for lifting the support frame 231, reducing the load requirements of the drive mechanism 3 and improving the reliability and energy efficiency of the system operation.

[0046] When the fork assembly 22 on the movable support 2 descends until the goods are supported by the movable base 1, the load on the movable support 2 decreases. When the load on the movable support 2 is less than the preset value N, the elastic force of the first elastic element 43 drives the telescopic rod 413 to extend relative to the base rod 412, thereby raising the support frame 231 and causing the first support wheel 232 to leave the ground. At this time, the traveling mechanism of the movable base 1 can drive the entire warehouse forklift to move, and the first support wheel 232 will not interfere with the movement. When the fork assembly 22 rises again to carry goods and exceeds the preset value N, the load on the movable support 2 overcomes the elastic force of the first elastic element 43 again, causing the telescopic rod 413 to retract again. The first support wheel 232 abuts the ground and provides additional support. Afterward, when the support frame 231 extends again, the support frame 231 and the first support wheel 232 abut the ground to provide stable support for the movable support 2, avoiding the risk of tipping over due to the shift in the center of gravity when the fork assembly 22 extends with goods.

[0047] Understandably, in one embodiment, the first elastic element 43 is sleeved on the outside of the base rod 412.

[0048] Understandably, in another embodiment, the base rod 412 is provided with a groove, one end of the telescopic rod 413 is slidably connected to the groove, and the first elastic member 43 is provided in the groove.

[0049] Understandably, in one embodiment, when the load on the movable bracket 2 is greater than the preset value N, during the process of the contact seat 42 pushing the lifting rod 41 to swing from the first position to the second position, the telescopic rod 413 retracts relative to the base rod 412.

[0050] Understandably, in another embodiment, when the load on the movable bracket 2 is greater than a preset value N, during the process of the contact seat 42 pushing the lifting rod 41 to swing from the first position to the second position, the telescopic rod 413 first retracts relative to the base rod 412, and then extends relative to the base rod 412, and the retraction stroke of the telescopic rod 413 relative to the base rod 412 is greater than its extension stroke. In the above technical solution, when the lifting rod 41 swings in the vertical plane, the state in which the abutment part 411 is at its maximum distance from the ground is when the lifting rod 41 is perpendicular to the ground. In the initial stage of the swing of the lifting rod 41, when the abutment part 411 just contacts the slot 421 of the contact seat 42, the lateral force causes the telescopic rod 413 to overcome the elastic force of the first elastic element 43 and retract relative to the base rod 412. This not only buffers the impact force at the moment of contact, but also adapts to the guide trajectory of the slot 421 through the retraction action, ensuring that the abutment part 411 is smoothly engaged. As the swing continues, the lifting rod 41 swings past the vertical angle, and the elastic force of the first elastic element 43 pushes the telescopic rod 413 to extend relative to the base rod 412. At this time, the elastic force of the first elastic element 43 will form a reverse resistance torque on the lifting rod 41. If it is necessary to drive the support frame 231 from the retracted state to the extended state, the drive mechanism 3 needs to overcome this resistance torque, thereby forming a reliable mechanical self-locking effect, effectively preventing the support frame 231 from accidentally extending due to vibration or external disturbance during driving.

[0051] Example 5: Based on Example 1, such as Figure 12 As shown, the lifting rod 41 is oscillatingly connected to the support frame 231, and the contact seat 42 is slidably connected to the movable base 1. A second elastic element 44 is provided between the contact seat 42 and the movable base 1, so that the contact seat 42 has a tendency to move toward the lifting rod 41; or, as Figure 11 As shown, the lifting rod 41 is oscillatingly connected to the movable base 1, and the contact seat 42 is slidably connected to the support frame 231. A second elastic element 44 is provided between the contact seat 42 and the support frame 231 so that the contact seat 42 has a tendency to move toward the lifting rod 41.

[0052] The second elastic element 44 is configured as follows: When the support frame 231 is in the retracted state and the load of the movable support 2 is less than the preset value N, the pressure exerted by the weight and load of the movable support 2 on the contact seat 42 is less than the elastic force of the second elastic element 44. The contact seat 42 extends toward the lifting rod 41 so that the lifting rod 41 lifts the support frame 231 and causes the first support wheel 232 to leave the ground. When the support frame 231 is in the retracted state and the load of the movable support 2 is greater than the preset value N, the pressure exerted by the weight of the movable support 2 and its load on the contact seat 42 is greater than the elastic force of the second elastic element 44. The contact seat 42 retracts away from the lifting rod 41 and the first support wheel 232 abuts against the ground.

[0053] In the above technical solution, the reasonable configuration of the elastic force of the second elastic element 44 ensures that the support frame 231 automatically adjusts its grounding state under different load conditions, thereby realizing flexible movement of the equipment under light load and stable support under heavy load. Since the elastic element does not have the ability to actively switch states, its response depends entirely on the mechanical balance relationship caused by load changes. Therefore, the system always operates in a passive adaptive manner without the need for additional control intervention.

[0054] When the load on the movable support 2 is less than the preset value N, the load on the movable support 2 has little impact on the vehicle stability. During the process of the support frame 231 switching from the extended state to the retracted state, when the slot 421 and the abutment part 411 are not in contact, the contact seat 42 is kept close to the lifting rod 41 under the support of the second elastic member 44. When the slot 421 and the abutment part 411 gradually approach each other and make contact, the contact seat 42 pushes the lifting rod 41 to swing from the first position to the second position. The reaction force of the lifting rod 41 presses the contact seat 42. Because the load on the fork assembly 22 is not enough to overcome the elastic force of the second elastic member 44, the contact seat 42 is kept close to the lifting rod 41 under the support of the second elastic member 44. During the process of the lifting rod 41 swinging from the first position to the second position, the lifting rod 41 lifts the support frame 231, causing the first support wheel 232 to leave the ground. After the first support wheel 232 leaves the ground, the walking mechanism of the movable base 1 can drive the entire warehouse forklift to move, and the first support wheel 232 will not interfere with the movement.

[0055] When the load on the movable bracket 2 exceeds the preset value N, the load on the movable bracket 2 has a significant impact on the vehicle body stability. During the retraction process of the support frame 231, when the slot 421 and the abutment part 411 are not in contact, the contacting seat 42 remains close to the lifting rod 41 under the support of the second elastic element 44. When the slot 421 and the abutment part 411 gradually approach each other until they contact, the contacting seat 42 pushes the lifting rod 41 to swing from the first position to the second position. The reaction force of the lifting rod 41 presses the contacting seat 42. Since the total weight of the movable bracket 2 and its load exert pressure on the contacting seat 42, it is sufficient to overcome the elastic force of the second elastic element 44. During the process of the lifting rod 41 swinging from the first position to the second position, the contacting seat 42 overcomes... The elastic force of the second elastic element 44 retracts away from the lifting rod 41 (here, "away" refers to the direction of movement). The contact seat 42 is always in contact with the abutment part 411. The movement of the contact seat 42 offsets the lifting distance caused by the swing of the lifting rod 41. Thus, during the retraction of the support frame 231, the height of the support frame 231 remains unchanged, and the first support wheel 232 remains in contact with the ground. This prevents the entire movable support 2 from shaking under heavy load due to the lifting of the support frame 231. Furthermore, since the support frame 231 is not lifted during the retraction process, the drive mechanism 3 does not need to provide additional driving force for lifting the support frame 231, reducing the load requirements of the drive mechanism 3 and improving the reliability and energy efficiency of the system operation.

[0056] When the fork assembly 22 on the moving support 2 descends until the goods are supported by the moving base 1, the load on the moving support 2 decreases. When the load on the moving support 2 is less than the preset value N, the elastic force of the second elastic element 44 drives the contact seat 42 to extend towards the lifting rod 41, thereby lifting the support frame 231 and causing the first support wheel 232 to leave the ground. At this time, the traveling mechanism of the moving base 1 can drive the entire warehouse forklift to move, and the first support wheel 232 will not interfere with the movement. When the fork assembly 22 rises again to carry goods and exceeds the preset value N, the load on the moving support 2 overcomes the elastic force of the second elastic element 44 again, causing the contact seat 42 to retract. The first support wheel 232 abuts the ground and provides additional support. Afterward, when the support frame 231 extends again, the support frame 231 and the first support wheel 232 abut the ground to provide stable support for the moving support 2, avoiding the risk of tipping over due to the shift in the center of gravity when the fork assembly 22 extends with goods.

[0057] Specifically, the sliding direction of the contact seat 42 is perpendicular to the extension and retraction direction of the support frame 231; or, the angle between the sliding direction of the contact seat 42 and the extension and retraction direction of the support frame 231 is greater than 0°. This technical solution ensures that the sliding of the contact seat can counteract the vertical component force generated by the swing of the lifting rod.

[0058] Understandably, in one embodiment, when the load on the movable bracket 2 is greater than the preset value N, during the process of the contact seat 42 pushing the lifting rod 41 to swing from the first position to the second position, the contact seat 42 moves away from the lifting rod 41 to compensate for the lifting stroke formed by the swing of the lifting rod 41, thereby ensuring that the support frame 231 always maintains a constant height during the retraction process.

[0059] Understandably, in another embodiment, when the load on the movable bracket 2 is greater than the preset value N, during the process of the contact seat 42 pushing the lifting rod 41 to swing from the first position to the second position, the contact seat 42 first moves away from the lifting rod 41, and then gradually returns to the direction of the lifting rod 41, and the return distance is less than the distance away. In the above technical solution, when the lifting rod 41 swings initially, the contact part 411 just contacts the slot 421 of the contact seat 42, and the force causes the contact seat 42 to overcome the elastic force of the second elastic member 44 and generate displacement. As the swing continues, the lifting rod 41 swings through the vertical angle, and the elastic force of the second elastic member 44 pushes the contact seat 42 closer to the lifting rod 41. At this time, the elastic force of the second elastic member 44 will form a reverse resistance torque on the lifting rod 41. If it is necessary to drive the support frame 231 from the retracted state to the extended state, the drive mechanism 3 needs to overcome this resistance torque, thereby forming a reliable mechanical self-locking effect, effectively preventing the support frame 231 from accidentally extending due to vibration or external disturbance during driving.

[0060] Example 6: Based on Example 1, such as Figure 13 As shown, the lifting rod 41 is oscillatingly connected to the lifting seat 45 and connected to the movable base 1 through the lifting seat 45 (that is, the oscillating connection between the lifting rod 41 and the movable base 1 is realized through the oscillating connection between the lifting rod 41 and the lifting seat 45). The lifting seat 45 is slidably connected to the movable base 1. The contacting seat 42 is provided on the support frame 231. A fourth elastic element 46 is provided between the lifting seat 45 and the movable base 1, so that the lifting seat 45 has a tendency to move towards the contact part 411. Or, such as Figure 14 As shown, the lifting rod 41 is oscillatingly connected to the lifting seat 45 and connected to the support frame 231 through the lifting seat 45 (that is, the oscillating connection between the lifting rod 41 and the support frame 231 is realized through the oscillating connection between the lifting rod 41 and the lifting seat 45). The lifting seat 45 is slidably connected to the support frame 231. The contacting seat 42 is provided on the movable base 1. A fourth elastic element 46 is provided between the lifting seat 45 and the support frame 231, so that the lifting seat 45 has a tendency to move towards the contact part 411.

[0061] The fourth elastic element 46 is configured as follows: When the support frame 231 is in the retracted state and the load of the movable support 2 is less than the preset value N, the pressure exerted by the weight of the movable support 2 and its load on the lifting seat 45 is less than the elastic force of the fourth elastic element 46. The lifting seat 45 extends toward the abutment part 411, and the lifting rod 41 lifts the support frame 231 so that the first support wheel 232 is lifted off the ground. When the support frame 231 is in the retracted state and the load of the movable support 2 is greater than the preset value N, the pressure exerted by the weight of the movable support 2 and its load on the lifting seat 45 is greater than the elastic force of the fourth elastic element 46. The support frame 231 pushes the lifting seat 45 to overcome the elastic force of the fourth elastic element 46 and retract towards the abutment part 411. The support frame 231 is in a low position and the first support wheel 232 abuts against the ground.

[0062] In the above technical solution, the reasonable configuration of the fourth elastic element 46 ensures that the support frame 231 automatically adjusts its grounding state under different load conditions, thereby achieving flexible movement of the equipment under light load and stable support under heavy load. Since the elastic element does not have the ability to actively switch states, its response depends entirely on the mechanical balance relationship caused by load changes. Therefore, the system always operates in a passive adaptive manner, requiring no additional control intervention. Its working principle is similar to that of Embodiments 4 or 5, and will not be repeated here.

[0063] Specifically, the sliding direction of the lifting seat 45 is perpendicular to the extension and retraction direction of the support frame 231; or, the angle between the sliding direction of the lifting seat 45 and the extension and retraction direction of the support frame 231 is greater than 0°. This technical solution ensures that the sliding of the lifting seat 45 can counteract the vertical component force generated by the swing of the lifting rod.

[0064] Understandably, in one embodiment, as the lifting rod 41 swings from the first position to the second position, the lifting seat 45 moves away from the contact portion 411 to compensate for the lifting stroke formed by the swing of the lifting rod 41, thereby ensuring that the support frame 231 maintains a constant height during the retraction process.

[0065] Understandably, in another embodiment, during the process of the lifting rod 41 swinging from the first position to the second position, the lifting seat 45 first moves away from the abutment portion 411, and then gradually returns to the abutment portion 411, with the return distance being less than the distance away. In the above technical solution, at the initial stage of the swing of the lifting rod 41, when the abutment portion 411 just contacts the slot 421 of the contact seat 42, the force causes the lifting seat 45 to overcome the elastic force of the fourth elastic element 46 and generate displacement. As the swing continues, the lifting rod 41 swings past the vertical angle, and the elastic force of the fourth elastic element 46 pushes the lifting seat 45 to move relatively closer to the abutment portion 411. At this time, the elastic force of the fourth elastic element 46 will form a reverse resistance torque on the lifting rod 41. If it is necessary to drive the support frame 231 from the retracted state to the extended state, the drive mechanism 3 needs to overcome this resistance torque, thereby forming a reliable mechanical self-locking effect, effectively preventing the support frame 231 from accidentally extending due to vibration or external disturbance during driving.

[0066] Example 7: like Figures 1 to 14 As shown, a warehouse forklift includes the lifting assembly 4 described in embodiment 4, 5, or 6, and also includes a movable base 1, a movable support 2 connected to the movable base 1, and a drive mechanism 3 for driving the movable support 2 to move laterally relative to the movable base 1. The movable support 2 includes a mast 21, a fork assembly 22 that is liftably connected to the mast 21, a support assembly 23 fixed to the mast 21, and a lifting mechanism 24 for driving the fork assembly 22 to move up and down relative to the mast 21. The fork assembly 22 includes fork teeth 221 for supporting and lifting goods. The support assembly 23 includes a support frame 231 and a first support wheel 232 mounted on the support frame 231. The support frame 231 has an extended state relative to the movable base 1 and a retracted state relative to the movable base 1. The fork tooth 221 has a first bearing surface 2211 for supporting the goods, the movable base 1 has a second bearing surface 11 for supporting the goods, and the lifting mechanism 24 drives the fork assembly 22 to lift so that the fork tooth 221 has a high position interval, a critical interval and a low position interval arranged sequentially from high to low. When the support frame 231 is in the extended state and the fork 221 is in the high position range, the first bearing surface 2211 supports the goods and the second bearing surface 11 is detached from the goods. When the support frame 231 is in the retracted state and the fork 221 is in the high position range, the first bearing surface 2211 supports the goods and the second bearing surface 11 is detached from the goods. When the support frame 231 is in the retracted state and the fork 221 is in the low position range, the first bearing surface 2211 is detached from the goods, and the second bearing surface 11 supports the goods. When the support frame 231 is in the retracted state and the fork 221 is in the critical range, under the action of the first elastic element 43 and the second elastic element 44, the first bearing surface 2211 and the second bearing surface 11 simultaneously support the goods.

[0067] In the above technical solution, the fork teeth 221 have a high-position interval, a critical interval, and a low-position interval arranged sequentially from high to low. The lifting and lowering of the fork teeth 221 enables the conversion of the cargo support position. When the support frame 231 is in the retracted state, the cargo can be smoothly transferred from the first bearing surface 2211 to the second bearing surface 11, with the cargo supported by the movable base 1, thus transforming the fork assembly 22 into an unloaded state. When the fork teeth 221 are in the high-position interval and retracting with the cargo, the load of the cargo compresses the first elastic element 43 or the second elastic element 44, thus eliminating the need to lift the support frame 231 with a load. This also eliminates the need to increase the load on the drive mechanism 3 to overcome the weight of the cargo, reducing the power requirement of the drive mechanism 3 and lowering costs. Furthermore, since the support frame 231 does not need to be lifted with the cargo when the fork assembly 22 retracts with the cargo, the risk of the cargo swaying or tipping during movement is eliminated, improving the stability and safety of the equipment operation.

[0068] In this embodiment, the movable support 2 moves relative to the movable base 1 in the left-right direction. The bottom of the movable base 1 is provided with several universal support wheels and two drive wheels spaced apart on the left and right. The shafts of the drive wheels extend in the left-right direction. There are two support components 23, which are spaced apart on opposite sides of the mast 21. The fork assembly 22 is located between the two support components 23. The support component 23 also includes a vertical frame 233 integrally formed with the support frame 231. The vertical frame 233 is perpendicular to the support frame 231 and vertically fixed to the mast 21. A support bar 234 is inclinedly arranged between the support frame 231 and the vertical frame 233. The two ends of the support bar 234 are fixed to the support frame 231 and the vertical frame 233, respectively. The support frame 231, the vertical frame 233 and the support bar 234 form a triangular support structure. The movable base 1 is provided with a limiting structure to restrict the lateral position of the movable support 2.

[0069] In the above technical solution, the support component 23 can also be located directly below the fork assembly 22 or inside the fork assembly 22. The left-right rotating shaft of the drive wheel can drive the mobile base 1 to move back and forth. The speed difference between the two drive wheels can realize the steering control of the mobile base 1, improving the mobility of the equipment in narrow spaces. The universal support wheel can provide multi-directional flexible support for the mobile base 1, adapting to uneven ground and reducing running resistance. Two symmetrically arranged support components 23 on the front and rear sides of the mast 21 place the fork assembly 22 between the two support components 23, forming a balanced support pattern. When the fork assembly 22 carries goods, the front and rear support components 23 can simultaneously share the load, effectively offsetting the eccentric torque caused by the weight of the goods, preventing the mobile support 2 from tilting or swaying due to uneven force, and ensuring load balance during handling. The upright frame 233 is vertically connected to the support frame 231 and then fixed by the inclined support bar 234. The triangular support structure formed by the three utilizes the stability characteristics of a triangle to greatly improve the structural strength and deformation resistance of the support component 23. Compared to a single rigid connection, this structure can distribute the load more evenly, distributing the force from the fork assembly 22 to the mast 21 across the support frame 231 and the upright frame 233. This avoids damage to components caused by localized stress concentration, allowing the support assembly 23 to maintain a stable posture even when carrying heavy loads. The limiting structure on the movable base 1 precisely restricts the lateral travel of the movable support 2, preventing it from colliding with the movable base 1 or other components due to excessive movement. It also ensures precise and controllable movement of the fork assembly 22, improving the accuracy of loading and unloading. Furthermore, this limiting structure provides cushioning when the movable support 2 reaches its limit position, reducing impact loads on the drive mechanism 3 and the support assembly 23, and extending the equipment's service life.

[0070] In this embodiment, the movable base 1 is provided with a receiving groove 12 for accommodating the fork teeth 221. When the fork teeth 221 descend, they are retracted into the receiving groove 12. The fork assembly 22 also includes a front and rear telescopic mechanism. The fork teeth 221 are connected to the telescopic end of the front and rear telescopic mechanism to drive the fork teeth 221 to extend or retract. The lifting mechanism 24 is used to drive the front and rear telescopic mechanism to lift. In the above technical solution, the receiving groove 12 provides storage space for the fork teeth 221. When the fork teeth 221 are descending, they can be completely embedded in the receiving groove 12, avoiding the risk of collision, wear, or personnel bumping into the exposed fork teeth 221 when not in operation, thus improving the safety of equipment use. Compared with the fixed-length fork teeth 221 structure, this telescopic design can improve operational flexibility without increasing the overall size of the equipment, allowing the warehouse forklift to adapt to rack layouts with different spacing and reducing the space occupied by the equipment in the warehouse.

[0071] Understandably, in one embodiment, the end of the support component 23 away from the first support wheel 232 is fixed to the gantry 21, and the bottom of the gantry 21 abuts against the movable base 1 through the support roller 25, so that the movable bracket 2 can swing relative to the movable base 1 around the support roller 25.

[0072] In the above technical solution, a flexible connection between the movable support 2 and the movable base 1 is achieved through the support roller 25, allowing the movable support 2 to swing slightly around the support roller 25. When the lifting assembly 4 lifts the support frame 231, the support roller 25 always remains in contact with the movable base 1, ensuring that the stability of the movable support 2 is not affected. Furthermore, power transmission can be achieved by connecting the support roller 25 to the output end of the drive mechanism 3, and the power transmission will not be interrupted due to the relative swing between the movable support 2 and the movable base 1.

[0073] Understandably, in another embodiment, the movable support 2 further includes a support plate that is laterally slidably connected to the movable base 1, the bottom of the gantry 21 is rotatably connected to the support plate, and the end of the support component 23 away from the first support wheel 232 is fixed to the gantry 21, so that the gantry 21 and the support component 23 can swing relative to the movable base 1 around the pivot at the bottom of the gantry 21.

[0074] In the above technical solution, the guide structure of the movable base 1 provides guidance for the vertical sliding of the movable support 2, ensuring the stability of the gantry 21 during the lifting process and avoiding deviation or jamming. While the movable support 2 slides up and down, the drive mechanism 3 maintains a lateral driving force on the movable support 2, achieving coordinated lifting and lateral movement, and significantly improving work efficiency.

[0075] Understandably, in another embodiment, the movable support 2 is slidably mounted on the movable base 1, and the movable base 1 is provided with a guide structure. The gantry 21 forms a sliding fit with the movable base 1 through the guide structure. When the movable support 2 slides up and down, the drive mechanism 3 always maintains a lateral driving effect on the movable support 2.

Claims

1. A support frame lifting assembly for a warehouse forklift, the warehouse forklift including a movable base (1), a movable support (2) connected to the movable base (1), and a drive mechanism (3) for driving the movable support (2) to move laterally relative to the movable base (1), the movable support (2) including a support frame (231) and a first support wheel (232) mounted on the support frame (231), the support frame (231) having an extended state and a retracted state relative to the movable base (1), characterized in that, The lifting assembly (4) includes a lifting rod (41) and a contact seat (42). The lifting rod (41) is sway-connected to one of the movable base (1) and the support frame (231) so that the lifting rod (41) can swing between a first position and a second position. The contact seat (42) is provided in the other of the support frame (231) and the movable base (1). The lifting rod (41) is provided with an abutment portion (411), and the contact seat (42) is provided with a mating portion (411). When the support frame (231) moves from the extended state to the retracted state, the slot (421) and the abutment (411) gradually approach each other from their separated positions until they come into contact and abut each other, and push the lifting rod (41) to swing from the first position to the second position. When the support frame (231) is in the retracted state, the lifting rod (41) in the second position lifts the support frame (231) by contacting the card seat (42) so that the first support wheel (232) is lifted off the ground.

2. The support frame lifting assembly for a warehouse forklift according to claim 1, characterized in that, The contact seat (42) is provided on the support frame (231). The contact seat (42) includes a protrusion (422) that protrudes downward relative to the support frame (231). The protrusion (422) has a vertical surface (423) on the side facing the lifting rod (41), and the slot (421) is provided above the vertical surface (423). When the slot (421) and the abutting part (411) are in contact, the abutting part (411) abuts against the vertical surface (423). Alternatively, the contact seat (42) is provided on the movable base (1). The contact seat (42) includes a protrusion (422) that protrudes upward relative to the movable base (1). The protrusion (422) has a vertical surface (423) on the side facing the lifting rod (41), and the slot (421) is provided below the vertical surface (423). When the slot (421) contacts and abuts with the abutting part (411), the abutting part (411) abuts against the vertical surface (423).

3. A support frame lifting assembly for a warehouse forklift according to claim 1, characterized in that, The lifting rod (41) is located on the movable base (1), and the contact seat (42) is located on the support frame (231). During the process of the lifting rod (41) swinging from the first position to the second position: The distance between the contact part (411) and the ground increases progressively; Alternatively, the distance between the contact part (411) and the ground increases first and then decreases, and the distance between the lifting rod (41) and the ground in the second position is greater than the distance between the lifting rod (41) and the ground in the first position.

4. A support frame lifting assembly for a warehouse forklift according to claim 1, characterized in that, The lifting rod (41) is mounted on the support frame (231), and the contact seat (42) is mounted on the movable base (1). During the process of the lifting rod (41) swinging from the first position to the second position: The distance between the hinge axis of the lifting rod (41) and the support frame (231) and the ground increases progressively; Alternatively, the distance between the hinge axis of the lifting rod (41) and the support frame (231) and the ground increases first and then decreases, and the distance between the hinge axis of the lifting rod (41) and the ground in the second position is greater than the distance between the hinge axis of the lifting rod (41) and the ground in the first position.

5. A support frame lifting assembly for a warehouse forklift according to claim 1, characterized in that, The lifting rod (41) includes a base rod (412) and a telescopic rod (413). The base rod (412) is sway-connected to one of the movable base (1) and the support frame (231). The telescopic rod (413) is slidably disposed on the base rod (412). The abutment part (411) is disposed on the telescopic rod (413). A first elastic element (43) is provided between the base rod (412) and the telescopic rod (413) so that the telescopic rod (413) has a tendency to extend relative to the base rod (412). The first elastic element (43) is configured as follows: When the support frame (231) is in the retracted state and the load of the movable support (2) is less than the preset value N, the pressure exerted by the weight of the movable support (2) and its load on the telescopic rod (413) is less than the elastic force of the first elastic element (43). The telescopic rod (413) extends relative to the base rod (412), and the lifting rod (41) lifts the support frame (231) so that the first support wheel (232) is lifted off the ground. When the support frame (231) is in the retracted state and the load of the movable support (2) is greater than the preset value N, the pressure exerted by the weight of the movable support (2) and its load on the telescopic rod (413) is greater than the elastic force of the first elastic element (43). The support frame (231) pushes the telescopic rod (413) to overcome the elastic force of the first elastic element (43) and retract relative to the base rod (412). The support frame (231) is in a low position and the first support wheel (232) touches the ground.

6. A support frame lifting assembly for a warehouse forklift according to claim 1, characterized in that, The contact seat (42) is slidably connected to the other of the support frame (231) and the movable base (1). A second elastic element (44) is provided between the contact seat (42) and the support frame (231) or the movable base (1) so that the contact seat (42) has a tendency to move toward the lifting rod (41). The second elastic element (44) is configured as follows: When the support frame (231) is in the retracted state and the load of the movable bracket (2) is less than the preset value N, the pressure exerted by the weight of the movable bracket (2) and its load on the contact seat (42) is less than the elastic force of the second elastic element (44). The contact seat (42) extends toward the lifting rod (41) so that the lifting rod (41) lifts the support frame (231) and causes the first support wheel (232) to leave the ground. When the support frame (231) is in the retracted state and the load of the movable support (2) is greater than the preset value N, the pressure exerted by the weight of the movable support (2) and its load on the contact seat (42) is greater than the elastic force of the second elastic element (44). The contact seat (42) retracts away from the lifting rod (41) and the first support wheel (232) comes into contact with the ground.

7. A support frame lifting assembly for a warehouse forklift according to claim 6, characterized in that, The sliding direction of the contact seat (42) is perpendicular to the extension and retraction direction of the support frame (231); or, the angle between the sliding direction of the contact seat (42) and the extension and retraction direction of the support frame (231) is greater than 0°.

8. A support frame lifting assembly for a warehouse forklift according to claim 1, characterized in that, The lifting rod (41) is sway-connected to the lifting seat (45) and connected to the movable base (1) or support frame (231) through the lifting seat (45). The lifting seat (45) is slidably connected to the movable base (1) or support frame (231). A fourth elastic element (46) is provided between the lifting seat (45) and the movable base (1) or support frame (231), so that the lifting seat (45) has a tendency to move toward the contact part (411). The fourth elastic element (46) is configured as follows: When the support frame (231) is in the retracted state and the load of the movable support (2) is less than the preset value N, the pressure exerted by the weight of the movable support (2) and its load on the lifting seat (45) is less than the elastic force of the fourth elastic element (46). The lifting seat (45) extends toward the abutment part (411), and the lifting rod (41) lifts the support frame (231) so that the first support wheel (232) is lifted off the ground. When the support frame (231) is in the retracted state and the load of the movable support (2) is greater than the preset value N, the pressure exerted by the weight of the movable support (2) and its load on the lifting seat (45) is greater than the elastic force of the fourth elastic element (46). The support frame (231) pushes the lifting seat (45) to retract against the back contact part (411) to overcome the elastic force of the fourth elastic element (46). The support frame (231) is in a low position and the first support wheel (232) touches the ground.

9. A support frame lifting assembly for a warehouse forklift according to claim 1, characterized in that, A third elastic element is provided between the lifting rod (41) and the movable base (1) or the support frame (231) so that the lifting rod (41) tends to stay in the first position; the abutting part (411) is a roller, which is rotatably connected to the lifting rod (41); the contact seat (42) is fixed to the support frame (231) and is integrally formed with the support frame (231).

10. A warehouse forklift, characterized in that, The lifting assembly (4) according to any one of claims 1 to 9 further includes a movable base (1), a movable support (2) connected to the movable base (1), and a drive mechanism (3) for driving the movable support (2) to move laterally relative to the movable base (1). The movable support (2) includes a mast (21), a fork assembly (22) that is liftably connected to the mast (21), a support assembly (23) fixed to the mast (21), and a lifting mechanism (24) for driving the fork assembly (22) to move up and down relative to the mast (21). The fork assembly (22) includes fork teeth (221) for supporting and lifting goods. The support assembly (23) includes a support frame (231) and a first support wheel (232) mounted on the support frame (231). The support frame (231) has an extended state that extends relative to the movable base (1) and a retracted state. The fork teeth (221) have a first bearing surface (2211) for supporting the goods, the movable base (1) has a second bearing surface (11) for supporting the goods, and the lifting mechanism (24) drives the fork assembly (22) to lift so that the fork teeth (221) have a high position interval, a critical interval and a low position interval arranged sequentially from high to low; When the support frame (231) is in the extended state and the fork tooth (221) is in the high position range, the first bearing surface (2211) supports the goods and the second bearing surface (11) is detached from the goods; When the support frame (231) is in the retracted state and the fork tooth (221) is in the high position range, the first bearing surface (2211) supports the goods and the second bearing surface (11) is detached from the goods; When the support frame (231) is in the retracted state and the fork tooth (221) is in the low position range, the first bearing surface (2211) is detached from the goods and the second bearing surface (11) supports the goods.

11. A warehouse forklift according to claim 10, characterized in that, The end of the support assembly (23) away from the first support wheel (232) is fixed to the gantry (21). The bottom of the gantry (21) abuts against the movable base (1) through the support roller (25) so that the movable bracket (2) can swing relative to the movable base (1) around the support roller (25). Alternatively, the movable support (2) may also include a support plate that is laterally slidably connected to the movable base (1), the bottom of the gantry (21) being rotatably connected to the support plate, and the end of the support assembly (23) away from the first support wheel (232) being fixed to the gantry (21). So that the gantry (21) and the support assembly (23) can swing relative to the movable base (1) about the pivot at the bottom of the gantry (21); Alternatively, the movable support (2) is slidably mounted on the movable base (1), and the movable base (1) is provided with a guide structure. The gantry (21) forms a sliding fit with the movable base (1) through the guide structure. When the movable support (2) slides up and down, the drive mechanism (3) always maintains a lateral driving effect on the movable support (2).

12. A warehouse forklift according to claim 10, characterized in that, The movable support (2) moves relative to the movable base (1) in the left-right direction. The bottom of the movable base (1) is provided with several universal support wheels and two drive wheels spaced apart on the left and right. The shafts of the drive wheels extend in the left-right direction. There are two support components (23), and the two support components (23) are spaced apart on opposite sides of the mast (21). The fork assembly (22) is located between the two support components (23). The support component (23) also includes a vertical frame (23) integrally formed with the support frame (231). 3) The upright (233) and the support frame (231) are set vertically, and the upright (233) is fixed vertically to the gantry (21). A support bar (234) is inclined between the support frame (231) and the upright (233). The two ends of the support bar (234) are fixed to the support frame (231) and the upright (233) respectively. The support frame (231), the upright (233) and the support bar (234) form a triangular support structure. The movable base (1) is provided with a limiting structure to restrict the lateral position of the movable support (2).

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