Forward moving type forklift with lifting function

Abstract

The invention provides a reach forklift with a lifting function, and relates to the technical field of forklifts. The reach forklift with the lifting function comprises a portal frame and a lifting driving device. The first hydraulic cylinder drives the top plate to be in linkage with the guide rod to compress the spring, the initial pre-tightening force and the elastic coefficient of the spring are adjusted in real time, the buffering force range and the change rate of the buffering system can be automatically matched according to the cargo weight, impact damage caused by insufficient buffering is avoided, secondary impact can be eliminated in combination with the buffering layer, and the service life is prolonged. A laser velocimeter is adopted to monitor the descending speed of the fork frame in real time, and when overspeed falling is detected, the two sets of second hydraulic cylinders respond in milliseconds and drive brake pads to extrude the inner wall of a sliding groove, continuous and controllable braking force is formed, it is ensured that the fork frame is accurately braked, the braking response time is short, and the braking effect is good. And safe and effective braking force is provided through the design of double hydraulic circuits, an alarm lamp and a loudspeaker are integrated, and acousto-optic warning is triggered when overspeed falling of the pallet fork is found.

Description

Technical Field

[0001] This invention relates to the field of forklift technology, specifically to a reach forklift with lifting function. Background Technology

[0002] Reach trucks are industrial handling vehicles, a type of warehouse forklift, referring to wheeled handling vehicles used for loading, unloading, stacking, and short-distance transport of palletized goods.

[0003] Currently, most lifting forklifts on the market use hydraulic pumps to drive pulleys, which, in conjunction with chains, control the lifting of the forks, thus increasing the lifting range. They are also equipped with hydraulic telescopic frames, translation adjustment mechanisms, and angle adjustment mechanisms, making the forklifts more flexible and adaptable to various environments. However, when the forks are raised to their highest point, they are prone to colliding with the top beam, causing vibrations that affect the stability of the goods. Furthermore, long-term excessive loads may cause the hydraulic cylinders to fail, leading to the forks falling off.

[0004] To address this, a publicly available technology proposes a reach truck with lifting function (Chinese Patent Publication No. CN219031684U), which includes a mast. A first rail and a second rail are vertically arranged on the mast. Forks are rotatably connected within the first rail. A top beam is installed at the top of the first rail, limiting the upward movement of the forks. A vibration damping device is installed on the top beam, comprising several first springs fixed to the bottom surface of the top beam. The bottom ends of the first springs are collectively fixed to a pressure plate. When the forks rise to the top, they contact the pressure plate, and the damping effect is achieved through the compression of the first springs. The impact action reduces vibration caused by the rigid impact between the forks and the top beam, minimizing the risk of goods falling. A lifting device is installed on the mast, and the lifting device and the second rail are set on the same plane. The lifting device includes a hydraulic rod, which is mounted on the mast. The output shaft of the hydraulic rod is set vertically upward, and mounting brackets are symmetrically fixed on the output shaft. Rollers are rotatably connected to both ends of the mounting brackets, and both rollers are rollingly connected to the second rail, preventing the mounting brackets from rotating. Two sprockets are rotatably connected to symmetrical positions at both ends of the mounting brackets, and chains are meshed on both sprockets. One end of each chain is fixed. One end is fixed to the mast, and the other end is fixed to the forks. When the hydraulic rod pushes the mounting frame up and down, it drives the sprockets to move, causing the chain to drag the forks up or down, thus lifting and lowering the transported goods. Both sprockets are equipped with braking devices, including an inner ratchet. The ratchet teeth of the inner ratchet are oriented in the opposite direction to the rotation of the sprocket when the forks are lowered. The inner ratchet is fixed to the mounting frame and close to the sprocket. The sprocket has a groove, which is arc-shaped and extends in a direction away from the sprocket axis. The direction of the groove extending outward is the same as the direction of the ratchet teeth of the inner ratchet. A fixing block is provided on the sprocket. A second spring is connected to the fixed block, and a locking block is connected to the other end of the second spring. The locking block is slidably connected to the slide groove. A counterweight is provided on the locking block. A pawl is provided on the side of the locking block that extends into the toothed ring of the inner edge ratchet. When the fork falls at excessive speed, the speed of the sprocket increases. Under the action of centrifugal force, the locking block overcomes the tension of the second spring and swings outward along the slide groove, engaging with the ratchet teeth of the inner edge ratchet, so that the sprocket stops rotating, thereby preventing the fork from falling. This device claims to solve the problems of the fork easily colliding with the top beam at the extreme position, causing the goods to vibrate, and the problem of the fork falling when the lifting device fails.

[0005] However, after studying the above-disclosed technology, it was found that its buffer device has the problem of not being able to adjust the buffer force. In addition, the method of its braking device is as follows: when the fork falls at excessive speed, the speed of the sprocket increases, and the locking block, under the action of centrifugal force, overcomes the tension of the second spring and swings outward along the slide groove, engaging with the ratchet teeth of the inner edge ratchet, so that the sprocket stops rotating, thereby preventing the fork from falling. As is well known, there are several situations for the fork to fall at excessive speed: one is chain breakage, and the other is hydraulic pump seal failure. The method of using the locking block to brake the sprocket proposed in the above-disclosed technology cannot solve the problem of the fork falling due to chain breakage (chain breakage between the sprocket and the fork), nor can it solve the problem of the fork falling due to hydraulic pump seal failure.

[0006] In conclusion, it is necessary to further improve and optimize the structure of reach trucks with lifting functions to solve the above problems. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a reach truck with lifting function, which solves the problems of unadjustable buffer force and inability to prevent forks from falling in existing reach trucks with lifting function.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a reach truck with lifting function, comprising a mast and a lifting drive device. Two sets of first rails and two sets of second rails are sequentially arranged on the inner sidewall of the mast from back to front. A fork is slidably connected between opposite sides of the two sets of second rails. A speed detection structure for detecting the fork's descent speed is provided on the front wall of the fork. Side connecting plates are fixedly connected to both the left and right sidewalls of the fork. A groove is provided on the side of the second rail facing the side connecting plate. The side connecting plate is rolledly connected to the inner sidewall of the groove via multiple sets of rollers. Two sets of vertically spaced rollers are fixedly connected to the side of the side connecting plate away from the fork. The fabric has two sets of horizontal supports, and two sets of vertical supports are fixedly connected to each other on opposite sides near both ends. A set of push plates is slidably connected to the opposite sides of the two sets of vertical supports. The push plates are slidably connected to the vertical supports through two sets of second guide rods. A brake pad is provided on the side of the push plate away from the vertical supports. A brake drive structure is provided between the horizontal supports and the push plates to push the brake pads against the inner wall of the slide groove to achieve braking. An alarm structure is provided on the upper wall of the side connecting plate to alarm when the fork carriage decelerates abnormally. A top beam is fixedly connected to the top of the two sets of second tracks. A buffer plate is connected to the lower wall of the top beam through an adjustment structure. A buffer structure is provided on the buffer plate.

[0009] To monitor the descent speed of the fork in real time, preferably, the speed detection structure includes an adjustable base and a laser velocimeter. A mounting groove is provided on the front wall of the fork near the lower wall. The adjustable base is fixedly connected to the upper wall inside the mounting groove, and the laser velocimeter is located at the lower end of the adjustable base.

[0010] A laser velocimeter is used to monitor the descent speed of the fork in real time. It can send a signal to the controller in a short time when the fork is falling rapidly, and the controller can then control the braking.

[0011] To improve the bonding force between the push plate and the brake pad, preferably, multiple sets of slots and blocks are provided between the push plate and the brake pad on opposite sides, and the multiple sets of blocks are respectively engaged with a set of slots.

[0012] Preferably, the brake pad is any one of a semi-metallic composite material, a ceramic fiber composite material, and an organic resin-based material.

[0013] By using multiple sets of locking blocks to engage with the slots, the brake pads do not separate from the push plate when rubbing against the inner wall of the slide, thus improving the interlayer bonding force and enhancing braking safety.

[0014] To enable emergency braking in the event of a rapid drop in the forklift, preferably, the brake drive structure includes two sets of second hydraulic cylinders. The two sets of second hydraulic cylinders are respectively fixedly connected to the opposite sides of two sets of cross braces. The extension shafts of the two sets of second hydraulic cylinders pass through the inner wall of the cross brace connected to the second hydraulic cylinder and extend into the space between the two sets of cross braces. A connector is fixedly connected to one end of the extension shaft of the second hydraulic cylinder that extends into the space between the two sets of cross braces. Two sets of connecting rods are rotatably connected to the end of the connector that is away from the second hydraulic cylinder. A set of push rods is connected to the end of each of the two sets of connecting rods that is away from the connector. The end of each of the two sets of push rods that is away from the connecting rods passes through the inner wall of a set of vertical braces and is fixedly connected to a set of push plates.

[0015] When the fork carriage drops rapidly, the hydraulic system immediately controls the extension shafts of the two sets of second hydraulic cylinders to extend. Through the connecting rod, the two sets of push rods are pushed to move away from each other, thereby causing the push plate and brake pads to stick to the inner wall of the slide groove. The friction between the brake pads and the slide groove is used to achieve braking and prevent the fork carriage from continuing to drop.

[0016] To provide a warning in the event of a rapid fork drop, the alarm structure preferably includes an alarm light and a speaker, which are fixedly connected to the side connecting plate wall in a front-to-back arrangement.

[0017] When the forklift drops rapidly, the controller triggers the alarm lights and speaker to issue an audible and visual warning to alert the staff.

[0018] To achieve adjustable buffering force, preferably, the adjustment structure includes a first hydraulic cylinder and a top plate. The first hydraulic cylinder is fixedly connected to the upper wall of the top beam, and the top plate is slidably connected to the upper wall of the top beam through two sets of first guide rods. The two sets of first guide rods are located on the left and right sides of the first hydraulic cylinder, respectively. The ends of the two sets of first guide rods away from the top plate penetrate the inner wall of the top beam and extend to the lower side of the top beam. The buffer plate is fixedly connected to the ends of the two sets of first guide rods that extend to the lower side of the top beam. The end of the extended shaft of the first hydraulic cylinder is in an overlapping state with the lower wall of the top plate.

[0019] Preferably, the buffer structure includes a buffer layer and multiple sets of springs, all of which are disposed between the upper wall of the buffer plate and the lower wall of the top beam, and the buffer layer is glued to the lower wall of the buffer plate.

[0020] The top plate is raised and lowered by axial displacement of the first hydraulic cylinder, which in turn compresses the free length of the first guide rod to form programmable buffer parameters. The spring compression is adjusted according to the weight of the cargo to dynamically match the range of buffer force. By setting a buffer layer, secondary impact and vibration are avoided when the forks touch the top when the spring is at its compression limit.

[0021] Preferably, the lifting drive device is located inside the gantry and between the two sets of first tracks, and the fork is driven to lift and lower by the lifting drive device.

[0022] This invention provides a reach truck with lifting function. It has the following advantages:

[0023] 1. Compared with existing technologies, this reach truck with lifting function uses a first hydraulic cylinder to drive the top plate linkage guide rod to compress the spring, and adjusts the initial preload and elastic coefficient of the spring in real time. This allows the buffering force range and rate of change of the buffering system to be automatically adapted to the weight of the goods, avoiding impact damage caused by insufficient buffering. Combined with the buffer layer, it can eliminate the secondary impact caused by overload of traditional fixed springs, thus improving the buffering efficiency.

[0024] 2. Compared with existing technologies, this reach truck with lifting function uses a laser speedometer to monitor the fork descent speed in real time. When an overspeed drop is detected, two sets of second hydraulic cylinders respond in milliseconds and drive the brake pads to squeeze the inner wall of the slide groove, forming a continuous and controllable braking force to ensure that the fork stops accurately. The braking response time is short, and the dual hydraulic circuit design provides safe and effective braking force.

[0025] 3. Compared with existing technologies, this reach truck with lifting function integrates alarm lights and speakers. It reads the detection signal of the laser speedometer through common control equipment on the market and triggers an audible and visual warning when it detects that the forks are falling at excessive speed. Attached Figure Description

[0026] Figure 1This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 For the present invention Figure 1 A magnified view of a section at point A in the middle;

[0028] Figure 3 For the present invention Figure 1 A magnified view of a section at point B in the middle;

[0029] Figure 4 This is a partial sectional view of the side of the connection structure of the second track, side connecting plate, roller, push plate and brake pad of the present invention.

[0030] Figure 5 This is a schematic diagram of the brake pad structure of the present invention;

[0031] Figure 6 This is a schematic diagram of the pusher plate structure of the present invention;

[0032] Figure 7 This is a partial schematic diagram of the connection structure between the top beam and the buffer plate of the present invention.

[0033] The components are as follows: 1. Gantry; 2. First track; 3. Second track; 301. Slide groove; 4. Lifting drive device; 5. Fork frame; 501. Mounting groove; 6. Top beam; 7. First hydraulic cylinder; 8. Top plate; 9. First guide rod; 10. Buffer plate; 11. Side connecting plate; 12. Alarm light; 13. Speaker; 14. Adjustable base; 15. Laser velocimeter; 16. Roller; 17. Horizontal brace; 18. Vertical brace; 19. Push plate; 1901. Slot; 20. Brake pad; 2001. Block; 21. Second guide rod; 22. Push rod; 23. Second hydraulic cylinder; 24. Connector; 25. Connecting rod; 26. Spring; 27. Buffer layer. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example:

[0036] like Figures 1 to 7As shown, this embodiment of the invention provides a reach truck with lifting function, including a mast 1 and a lifting drive device 4. The inner side wall of the mast 1 is provided with two sets of first rails 2 and two sets of second rails 3 from back to front. Forks 5 are slidably connected between opposite sides of the two sets of second rails 3. The lifting drive device 4 is located inside the mast 1 and between the two sets of first rails 2. The forks 5 are driven to lift and lower by the lifting drive device 4. This embodiment also includes a commonly available control system and a hydraulic system for driving the lifting drive device 4, the first hydraulic cylinder 7, and the second hydraulic cylinder 23.

[0037] In order to monitor the descent speed of the fork carriage 5 in real time, a speed detection structure for detecting the descent speed of the fork carriage 5 is provided on the front wall of the fork carriage 5. The speed detection structure includes an adjustable base 14 and a laser velocimeter 15. A mounting groove 501 is provided on the front wall of the fork carriage 5 near the lower wall. The adjustable base 14 is fixedly connected to the upper wall inside the mounting groove 501. The laser velocimeter 15 is located at the lower end of the adjustable base 14.

[0038] A laser velocimeter 15 is used to monitor the descent speed of the fork 5 in real time. It can send a signal to the controller in a short time when the fork 5 drops rapidly, and the controller can control the braking.

[0039] To provide emergency braking in the event of a rapid drop in the fork carriage 5, side connecting plates 11 are fixedly connected to both the left and right side walls of the fork carriage 5. A groove 301 is provided on the side of the second track 3 facing the side connecting plate 11. The side connecting plate 11 is rotatably connected to the inner wall of the groove 301 via multiple sets of rollers 16. Two sets of vertically distributed cross braces 17 are fixedly connected to the side of the side connecting plate 11 away from the fork carriage 5. A set of vertical braces 18 is fixedly connected between the opposite sides of the two sets of cross braces 17 and near their ends. A set of push plates 19 is slidably connected to the opposite sides of the two sets of vertical braces 18. The push plates 19 are slidably connected to the vertical braces 18 via two sets of second guide rods 21. A brake pad 20 is provided on the side of the push plate 19 away from the vertical brace 18. A space for pushing the brake pad 20 is provided between the cross braces 17 and the push plate 19. A brake drive structure is provided for braking by adhering to the inner wall of the slide groove 301. The brake drive structure includes two sets of second hydraulic cylinders 23. The two sets of second hydraulic cylinders 23 are respectively fixedly connected to the opposite sides of two sets of cross braces 17. The extension shafts of the two sets of second hydraulic cylinders 23 pass through the inner wall of the cross brace 17 connected to the second hydraulic cylinder 23 and extend into the space between the two sets of cross braces 17. A connector 24 is fixedly connected to one end of the extension shaft of the second hydraulic cylinder 23 that extends into the space between the two sets of cross braces 17. Two sets of connecting rods 25 are rotatably connected to one end of the connector 24 away from the second hydraulic cylinder 23. A set of push rods 22 are respectively connected to one end of the two sets of connecting rods 25 away from the connector 24. The two sets of push rods 22 pass through the inner wall of a set of vertical braces 18 and are fixedly connected to a set of push plates 19.

[0040] When the fork 5 falls rapidly, the hydraulic system immediately controls the extension shafts of the two sets of second hydraulic cylinders 23 to extend, and pushes the two sets of push rods 22 to move away from each other through the connecting rod 25. This causes the push plate 19 and brake pad 20 to stick to the inner wall of the slide groove 301. The friction between the brake pad 20 and the slide groove 301 achieves braking, preventing the fork 5 from falling further.

[0041] In order to improve the bonding force between the push plate 19 and the brake pad 20, multiple sets of slots 1901 and blocks 2001 are respectively provided between the push plate 19 and the brake pad 20 on opposite sides. The multiple sets of blocks 2001 are respectively engaged with a set of slots 1901. The brake pad 20 is any one of semi-metallic composite material, ceramic fiber composite material and organic resin-based material.

[0042] By having multiple sets of locking blocks 2001 engage with the locking slots 1901 respectively, the brake pads 20 will not separate from the push plate 19 when rubbing against the inner wall of the slide groove 301, thus improving the interlayer bonding force and enhancing braking safety.

[0043] In order to issue a warning when the fork 5 drops rapidly, the upper wall of the side connecting plate 11 is provided with an alarm structure for alarming when the fork 5 decelerates abnormally. The alarm structure includes an alarm light 12 and a speaker 13, which are fixedly connected to the upper wall of the side connecting plate 11 in a front-to-back arrangement.

[0044] When the forklift 5 drops rapidly, the controller triggers the alarm light 12 and speaker 13 to issue an audible and visual warning to alert the staff.

[0045] To achieve adjustable buffering force, a top beam 6 is fixedly connected to the top of the two sets of second tracks 3. A buffer plate 10 is connected to the lower wall of the top beam 6 through an adjustment structure. A buffer structure is provided on the buffer plate 10. The adjustment structure includes a first hydraulic cylinder 7 and a top plate 8. The first hydraulic cylinder 7 is fixedly connected to the upper wall of the top beam 6. The top plate 8 is slidably connected to the upper wall of the top beam 6 through two sets of first guide rods 9. The two sets of first guide rods 9 are located on the left and right sides of the first hydraulic cylinder 7, respectively. The ends of the two sets of first guide rods 9 away from the top plate 8 penetrate the inner wall of the top beam 6 and extend to the lower side of the top beam 6. The buffer plate 10 is fixedly connected to the ends of the two sets of first guide rods 9 that extend to the lower side of the top beam 6. The end of the extended shaft of the first hydraulic cylinder 7 is in an overlapping state with the lower wall of the top plate 8. The buffer structure includes a buffer layer 27 and multiple sets of springs 26. The multiple sets of springs 26 are all set between the upper wall of the buffer plate 10 and the lower wall of the top beam 6. The buffer layer 27 is glued to the lower wall of the buffer plate 10.

[0046] The first hydraulic cylinder 7 drives the top plate 8 to rise and fall by axial displacement, which in turn compresses the free length of the first guide rod 9 to form programmable buffer parameters. The compression of the spring 26 is adjusted according to the weight of the cargo to dynamically match the range of buffer force. By setting the buffer layer 27, secondary impact and vibration are avoided when the forks touch the top when the spring 26 is at its compression limit.

[0047] Working principle: A laser velocimeter 15 monitors the descent speed of the fork carriage 5 in real time. It can send a signal to the controller shortly after a rapid descent of the fork carriage 5, and the controller then controls the braking. When a rapid descent of the fork carriage 5 occurs, the hydraulic system immediately controls the extension shafts of two sets of second hydraulic cylinders 23 to extend. This, via the connecting rod 25, pushes two sets of push rods 22 away from each other, thereby causing the push plate 19 and brake pads 20 to adhere to the inner wall of the slide groove 301. Braking is achieved through the friction between the brake pads 20 and the slide groove 301, preventing the fork carriage 5 from continuing to fall. Multiple sets of slots 1901 and blocks 2001 are respectively provided between the push plate 19 and the opposite side of the brake pads 20. Each set of blocks 2001 corresponds to one set of slots. The 1901 latching mechanism, through multiple sets of latching blocks 2001 engaging with the latching slot 1901, prevents the brake pads 20 from separating from the push plate 19 when rubbing against the inner wall of the slide groove 301, thus improving the interlayer bonding force and enhancing braking safety. When the fork carriage 5 drops rapidly, the controller triggers the alarm light 12 and speaker 13, emitting an audible and visual warning to alert the staff. The axial displacement of the first hydraulic cylinder 7 drives the top plate 8 to rise and fall, which in turn compresses the free length of the spring 26 via the first guide rod 9, forming programmable buffer parameters. The compression of the spring 26 is adjusted according to the weight of the cargo, so that the buffer force range is dynamically matched. By setting the buffer layer 27, secondary impact and vibration are avoided when the forks touch the top when the spring 26 reaches its compression limit.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A reach truck with lifting function, characterized in that: The system includes a gantry (1) and a lifting drive device (4). The inner wall of the gantry (1) is provided with two sets of first tracks (2) and two sets of second tracks (3) arranged sequentially from back to front. A fork (5) is slidably connected between opposite sides of the two sets of second tracks (3). A speed detection structure for detecting the descent speed of the fork (5) is provided on the front wall of the fork (5). Side connecting plates (11) are fixedly connected to both the left and right side walls of the fork (5). A groove (301) is provided on the side of the second track (3) facing the side connecting plate (11). The side connecting plate (11) is slidably connected to the inner wall of the groove (301) via multiple sets of rollers (16). Two sets of vertically distributed horizontal supports (17) are fixedly connected to the side of the side connecting plate (11) away from the fork (5). The two sets of horizontal supports (17) are slidably connected between opposite sides and close to each other. A set of vertical supports (18) are fixedly connected to each end position. A set of push plates (19) are slidably connected to the opposite side of the two sets of vertical supports (18). The push plates (19) are slidably connected to the vertical supports (18) through two sets of second guide rods (21). A brake pad (20) is provided on the side of the push plate (19) away from the vertical supports (18). A brake drive structure is provided between the cross brace (17) and the push plate (19) for pushing the brake pad (20) against the inner wall of the slide groove (301) to achieve braking. An alarm structure is provided on the upper wall of the side connecting plate (11) for alarming when the fork (5) experiences abnormal speed reduction. A top beam (6) is fixedly connected to the top of the two sets of second rails (3). A buffer plate (10) is connected to the lower wall of the top beam (6) through an adjustment structure. A buffer structure is provided on the buffer plate (10).

2. A reach truck with lifting function according to claim 1, characterized in that: The speed detection structure includes an adjustable base (14) and a laser velocimeter (15). The fork (5) has a mounting groove (501) on its front wall and near its lower wall. The adjustable base (14) is fixedly connected to the upper wall inside the mounting groove (501). The laser velocimeter (15) is located at the lower end of the adjustable base (14).

3. A reach truck with lifting function according to claim 2, characterized in that: Multiple sets of slots (1901) and blocks (2001) are respectively provided between the push plate (19) and the brake pad (20) on opposite sides, and the multiple sets of blocks (2001) are respectively engaged with a set of slots (1901).

4. A reach truck with lifting function according to claim 3, characterized in that: The brake pad (20) is any one of a semi-metallic composite material, a ceramic fiber composite material, and an organic resin-based material.

5. A reach truck with lifting function according to claim 4, characterized in that: The brake drive structure includes two sets of second hydraulic cylinders (23). The two sets of second hydraulic cylinders (23) are fixedly connected to the opposite sides of the two sets of cross braces (17). The extension shafts of the two sets of second hydraulic cylinders (23) pass through the inner wall of the cross brace (17) connected to the second hydraulic cylinder (23) and extend into the space between the two sets of cross braces (17). A connector (24) is fixedly connected to one end of the extension shaft of the second hydraulic cylinder (23) that extends into the space between the two sets of cross braces (17). Two sets of connecting rods (25) are rotatably connected to one end of the connector (24) away from the second hydraulic cylinder (23). A set of push rods (22) is connected to one end of the two sets of connecting rods (25) away from the connector (24). A set of push rods (22) is fixedly connected to one end of the two sets of push rods (22) away from the connecting rods (25).

6. A reach truck with lifting function according to claim 5, characterized in that: The alarm structure includes an alarm light (12) and a speaker (13), which are fixedly connected to the upper wall of the side connecting plate (11) in a front-to-back arrangement.

7. A reach truck with lifting function according to claim 6, characterized in that: The adjustment structure includes a first hydraulic cylinder (7) and a top plate (8). The first hydraulic cylinder (7) is fixedly connected to the upper wall of the top beam (6). The top plate (8) is slidably connected to the upper wall of the top beam (6) by two sets of first guide rods (9). The two sets of first guide rods (9) are located on the left and right sides of the first hydraulic cylinder (7). The ends of the two sets of first guide rods (9) away from the top plate (8) penetrate the inner wall of the top beam (6) and extend to the lower side of the top beam (6). The buffer plate (10) is fixedly connected to the ends of the two sets of first guide rods (9) that extend to the lower side of the top beam (6). The end of the extended shaft of the first hydraulic cylinder (7) is in an overlapping state with the lower wall of the top plate (8).

8. A reach truck with lifting function according to claim 7, characterized in that: The buffer structure includes a buffer layer (27) and multiple sets of springs (26). The multiple sets of springs (26) are all disposed between the upper wall of the buffer plate (10) and the lower wall of the top beam (6). The buffer layer (27) is glued to the lower wall of the buffer plate (10).

9. A reach truck with lifting function according to claim 8, characterized in that: The lifting drive device (4) is installed inside the gantry (1) and located between the two sets of first tracks (2). The fork (5) is driven to lift by the lifting drive device (4).

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