A range-extended electric forklift truck

Abstract

This invention discloses a range-extended electric forklift converted from a gasoline-powered forklift, relating to the technical field of material handling equipment. It includes a vehicle body, a lifting frame, a fork carriage, and two forks. A first drive device is provided on the fork carriage for driving either fork to slide left and right. Several limiting members are rotatably connected to the forks, and a second drive device is provided on the forks for controlling the rotation of these limiting members. The protruding limiting members increase the friction and resistance between the load-bearing portion and the cargo on that side, while the two forks can move relatively closer or further apart under the action of the first drive device. Therefore, when the cargo shifts towards one fork position, the cargo is fixed by rotating the limiting member on the other fork. The upper surface of the load-bearing portion of the shifted fork is relatively smooth, allowing the pallet to be relatively displaced relative to the shifted fork by lateral movement of either fork, thus adjusting the shifted position. Ultimately, the pallet can be adjusted without being placed on the ground, facilitating operation.

Description

Technical Field

[0001] This application relates to the technical field of material handling equipment, and in particular to a range-extended electric forklift converted from gasoline. Background Technology

[0002] Forklifts are industrial handling vehicles capable of loading, unloading, stacking, and short-distance transport of palletized goods. Pallets have a double-hollow structure with two insertion holes on each side for the forklift's forks to enter. When a forklift is handling goods, the two forks enter the two insertion holes, and then the forks, using the lifting function of the fork carriage, lift the pallet and the goods on it for transport.

[0003] Regarding the aforementioned technologies, the inventors believe that the following drawbacks exist: In order to adapt to the size specifications of different forklifts, pallets are usually designed with relatively large insertion holes around them. This makes it easy for the pallet to shift on the forks when encountering bumps during forklift transportation. If the goods are large in size or weight, there is a risk of the goods tipping over. To adjust the position of the pallet, the forklift must be stopped, the pallet must be lowered, and the forks must be re-aligned and inserted into the insertion holes of the pallet, repeating the work before transportation, which is quite troublesome and inconvenient. Summary of the Invention

[0004] To facilitate the adjustment of the lateral position of pallets and goods on the forklift, this application provides a range-extended electric forklift converted from a gasoline engine.

[0005] This application provides a range-extended electric forklift converted from gasoline engine to electric vehicle, which adopts the following technical solution:

[0006] A range-extended electric forklift converted from gasoline includes a body, a lifting frame, a fork carriage, and two shovel forks. The two shovel forks are slidably mounted side-by-side on the fork carriage. Each shovel fork includes a sliding part connected to the fork carriage and a load-bearing part for placing goods. The fork carriage is provided with a first driving device for driving either shovel fork to slide left and right. Several limiting members are rotatably connected to each shovel fork, and a second driving device is provided on the shovel fork for controlling the rotation of the limiting members. The upper surface of the load-bearing part for placing goods is used as a reference surface, and the limiting members can rotate from below the reference surface to one end protruding upwards from the reference surface.

[0007] Optionally, the limiting member includes a rotating ring and an abutment block disposed on the rotating ring; the abutment block is a triangle with its tip facing outward from the rotating ring, and when the limiting member rotates from below the reference surface to the abutment block protruding upward from the reference surface, the end of the abutment block is located above the reference surface; an anti-slip coating is provided on the outer side of the end of the abutment block.

[0008] Optionally, the second driving device includes a motor assembly and a linkage assembly; the linkage assembly includes a plurality of transmission sleeves fixedly connected to the transmission shaft, the number of transmission sleeves and the position of the limiting member are the same and correspond one-to-one; a push groove is provided on the rotating ring along the circumferential direction, and a push block is provided on the transmission sleeve extending into the push groove, the arc length of the push groove on the circumference of the rotating ring is greater than the arc length of the push block on the circumference of the transmission sleeve, so that the push block can move relative to the push block in the circumferential direction within the push groove.

[0009] Optionally, the linkage assembly further includes a drive shaft rotatably mounted on the support portion and several coil springs. The motor assembly is used to drive the drive shaft to rotate relative to the support portion. The limiting member is rotatably connected to the drive shaft. The number of coil springs is the same as that of the limiting member and their positions correspond one-to-one. One end of the coil spring is fixedly connected to the drive shaft, and the other end presses the limiting member upwards outwards from the reference surface.

[0010] Optionally, the limiting members are arranged at intervals along the length direction of the bearing portion; two sets of limiting members are provided, the two sets of limiting members are symmetrically arranged on both sides of the bearing portion, and the rotation directions of the two sets of limiting members when they protrude upward from the reference surface are opposite.

[0011] Optionally, the upper ends of both sides of the bearing portion are provided with relief grooves at the positions of any limiting member, allowing the limiting member to rotate upward and embed.

[0012] Optionally, the support portion has mounting grooves extending along its own length on both sides, and the rotating ring and the drive shaft are disposed in the mounting grooves; the support portion is provided with a protective cover that covers the rotating ring and the drive shaft in the mounting grooves.

[0013] Optionally, the bottom of the bearing portion is provided with a receiving groove for the limiting member to be rotatably embedded, and the receiving groove is connected to the mounting groove.

[0014] Optionally, the motor assembly includes a geared motor and a gearbox connected to the geared motor; the transmission shaft is provided with two shafts, each corresponding to one of the two sets of limiting members; the gearbox is provided with two output ends, each of the two output ends being connected to one of the two transmission shafts, thereby converting the driving force of the geared motor into the rotational force of the two synchronous but opposite transmission shafts through the gearbox.

[0015] In summary, this application includes at least one of the following beneficial technical effects:

[0016] 1. The protruding limiting piece increases the friction and resistance between the load-bearing part and the goods on that side, and the two forks can move closer or further apart under the action of the first drive device; therefore, when the goods shift to the position of one fork, the limiting piece on the other fork is rotated to fix the goods, and the upper surface of the load-bearing part of the offset fork is relatively smooth, so the pallet and the offset fork can be moved relative to each other by moving either fork laterally, thereby adjusting the offset position. In the end, the position of the pallet can be adjusted without placing it on the ground, which is convenient for operation.

[0017] 2. The use of coil springs can serve as an elastic buffer between the limiting component and the pallet, reducing the impact of bumps on the pallet;

[0018] 3. When no position adjustment is required, the limiting component can be rotated and hidden in the receiving groove to prevent the limiting component from affecting the insertion hole of the fork when entering or exiting the pallet. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0020] Figure 2 yes Figure 1 The enlarged diagram at point A in the image is used to illustrate the structure of the fork and the spatula.

[0021] Figure 3 This is a partial schematic diagram of an embodiment of this application, used to illustrate the structure of the motor assembly.

[0022] Figure 4 This is another partial schematic diagram of an embodiment of this application, used to illustrate the structure of the support part, the limiting member, and the linkage component.

[0023] Figure 5 This is an exploded structural diagram of the linkage component and limiting component according to an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Body; 11. Lifting frame; 2. Fork frame; 21. Lateral guide rod; 22. Hydraulic cylinder; 3. Fork; 31. Sliding part; 32. Bearing part; 321. Mounting groove; 322. Clearance groove; 323. Receiving groove; 324. Protective cover; 33. Reference surface; 4. Limiting component; 41. Rotating ring; 411. Push groove; 42. Abutment block; 5. Linkage assembly; 51. Drive shaft; 52. Coil spring; 53. Transmission sleeve; 531. Push block; 6. Motor assembly; 61. Gear motor; 62. Gearbox; 621. Output end. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0027] This application discloses a range-extended electric forklift converted from gasoline to electric.

[0028] Reference Figure 1 , Figure 2 The range-extended electric forklift includes a body 1, a lifting frame 11, a fork carriage 2, and two shovel forks 3. The lifting frame 11 is installed at the front end of the body 1, and the fork carriage 2 slides up and down along the lifting frame 11 controlled by hydraulic cylinders. A transverse guide rod 21 is fixedly connected to the fork carriage 2, and the two shovel forks 3 are slidably arranged side by side on the transverse guide rod 21. The shovel forks 3 are L-shaped and include a sliding part 31 that is slidably connected to the transverse guide rod 21 at its upper end, and a load-bearing part 32 that extends horizontally forward for placing goods. A first drive device is installed on the fork carriage 2. In this embodiment, the first drive device consists of two hydraulic cylinders 22 arranged horizontally on the left and right. The two hydraulic cylinders 22 are respectively connected to the middle of the two sliding parts 31 from opposite directions to independently realize the left and right lateral movement control of the two shovel forks 3.

[0029] Reference Figure 3 , Figure 4 The fork 3 is equipped with a motor assembly 6 and a linkage assembly 5. The linkage assembly includes two drive shafts 51, and each side of the bearing portion 32 has a mounting groove 321 along its own length. The two drive shafts 51 are rotatably connected to the two mounting grooves 321, and the drive shafts 51 extend along the length of the bearing portion 32. Several limiting members 4 are rotatably connected to the drive shafts 51. The left and right sets of limiting members 4 are symmetrically arranged on both sides of the bearing portion 32, and are spaced apart along the length of the bearing portion 32. The limiting member 4 is teardrop-shaped and includes a rotating ring 41 that is sleeved on the drive shaft 51 and an abutment block 42 integrally formed on the outside of the rotating ring 41. The abutment block 42 is a triangle with its tip pointing outward. The upper surface of the bearing part 32 used to place goods is used as the reference surface 33. The limiting member 4 can rotate from below the reference surface 33 until the end of the abutment block 42 protrudes upward from the reference surface 33. The rotation direction is from the outside of the bearing part 32 to the inside, and the outer side of the end of the abutment block 42 is provided with an anti-slip coating.

[0030] Reference Figure 4 , Figure 5 The linkage component 5 also includes coil springs 52 and transmission sleeves 53, which are the same number and positional as the limiting members 4. The coil springs 52 and transmission sleeves 53 are respectively arranged on both sides of the corresponding limiting member 4. A push groove 411 is formed on the rotating ring 41 along the circumferential direction, and a push block 531 extending into the push groove 411 is integrally formed on the transmission sleeve 53. The width of the push groove 411 is greater than the thickness of the push block 531, so that the push block 531 can move a certain distance relative to the limiting member 4 in the circumferential direction within the push groove 411, that is, the limiting member 4 can rotate relative to the transmission sleeve 53 at a certain angle. One end of the coil spring 52 is fixedly connected to the transmission shaft 51, and the other end presses the limiting member 4 upward in the rotation direction protruding from the reference surface 33.

[0031] Reference Figure 3 , Figure 4 The motor assembly 6 is located on the side of the bottom of the sliding part 31 facing away from the bearing part 32. It includes a geared motor 61 and a gearbox 62. The gearbox 62 has two output ends 621, which are respectively connected to two drive shafts 51. The driving force of the geared motor 61 is converted into the rotation of the two synchronous but opposite drive shafts 51 through the gearbox 62, so that the rotation directions of the left and right limit members 4 when they protrude upward from the reference surface 33 are opposite.

[0032] Reference Figure 4 , Figure 5 The upper ends of both sides of the bearing portion 32 are provided with relief grooves 322 for the abutment block 42 to be inserted at the positions corresponding to any of the limiting members 4. When the abutment block 42 protrudes from the reference surface 33, it is pressed against the relief groove 322 under the action of the coil spring 52. At this time, keeping the drive shaft 51 stationary, the limiting member 4 can act as an elastic buffer between the bearing portion 32 and the tray, reducing the impact of bumps on the tray. Furthermore, by appropriately adjusting the angle of the drive shaft 51, the magnitude of the elastic compression force of the coil spring 52 on the limiting member 4 can be changed, thus adjusting the buffering effect.

[0033] Reference Figure 3 , Figure 4 The support portion 32 has detachable protective covers 324 on both sides that partially cover the opening of the mounting groove 321. The bottom of the support portion 32 also has a receiving groove 323 for the rotatable retaining member 4, which is connected to the mounting groove 321. When no position adjustment is needed, rotating the drive shaft 51 allows the push block 531 on the drive sleeve 53 to rotate and conceal the retaining member 4 within the receiving groove 323. This is both aesthetically pleasing and prevents the protruding retaining member 4 from interfering with the insertion hole of the fork 3 into and out of the pallet.

[0034] The implementation principle of a range-extended electric forklift converted from gasoline to electric in this application embodiment is as follows:

[0035] When the goods shift to the position of one side of the fork 3, the transmission shaft 51 on the other side of the fork 3 is rotated by the motor assembly 6, so that the protrusion of the limiting member 4 contacts the bottom of the pallet. The pallet is fixed by the contact friction between the anti-slip coating on the limiting member and the pallet. The upper end surface of the bearing part 32 of the offset side fork 3 is relatively smooth, and the pallet and the offset fork 3 can be moved relative to each other by moving either fork 3 laterally, so as to adjust the offset position. In the end, the position of the pallet can be adjusted without placing it on the ground, which is convenient for operation.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A range-extended electric forklift truck, comprising a vehicle body (1), a lifting frame (11), a fork frame (2) and two forks (3), the two forks (3) being arranged side by side on the fork frame (2) and being capable of sliding; each fork (3) comprises a sliding part (31) connected to the fork frame (2) and a load-carrying part (32) for placing goods; the fork frame (2) is provided with a first driving device for driving any fork (3) to slide left and right; characterized in that, A plurality of limiting members (4) are rotatably connected to the fork (3), and a second driving device for controlling the rotation of the limiting members (4) is arranged on the fork (3); the upper end surface of the bearing part (32) for placing goods is taken as a reference surface (33), and the limiting members (4) can rotate from below the reference surface (33) to one end protruding upward from the reference surface (33); The limiting member (4) comprises a rotating ring (41) and an abutting block (42) arranged on the rotating ring (41); the abutting block (42) is triangular with a pointed end facing outward of the rotating ring; when the limiting member (4) rotates from below the reference surface (33) to the abutting block (42) protruding upward from the reference surface (33), the end of the abutting block (42) is located above the reference surface (33); the outer side of the end of the abutting block (42) is provided with an anti-skid coating; The second driving device comprises a motor assembly (6) and a linkage assembly (5); the linkage assembly (5) comprises a plurality of transmission sleeves (53) fixedly connected to a transmission shaft (51), the number of the transmission sleeves (53) is the same as that of the limiting members (4) and the positions are one-to-one corresponding; the rotating ring (41) is provided with a push groove (411) in the circumferential direction, the transmission sleeve (53) is provided with a push block (531) extending into the push groove (411), and the corresponding arc length of the push groove (411) on the circumference of the rotating ring (41) is greater than that of the push block (531) on the circumference of the transmission sleeve (53), so that the push block (531) can move in the circumferential direction relative to the push groove (411).

2. The range-extended oil-electric fork truck of claim 1, wherein: The linkage assembly (5) further comprises a transmission shaft (51) rotatably arranged on the bearing part (32) and a plurality of coil springs (52), and the motor assembly (6) is used to drive the transmission shaft (51) to rotate relative to the bearing part (32); the limiting member (4) is rotatably connected to the transmission shaft (51), the number of the coil springs (52) is the same as that of the limiting members (4) and the positions are one-to-one corresponding, one end of the coil spring (52) is fixedly connected to the transmission shaft (51), and the other end extrudes the limiting member (4) toward the direction of protruding upward from the reference surface (33).

3. The range-extended oil-electric fork truck of claim 2, wherein: The limiting members (4) are arranged at intervals along the length direction of the bearing part (32); the limiting members (4) are provided in two groups, the two groups of limiting members (4) are symmetrically arranged on the two sides of the bearing part (32), and the rotating directions of the two groups of limiting members (4) protruding upward from the reference surface (33) are opposite.

4. The range-extended oil-electric fork truck of claim 3, wherein: The upper end of the bearing part (32) on the two sides is provided with a give-way groove (322) for the upward rotation of the limiting member (4) to be embedded.

5. The range-extended oil-electric fork truck of claim 3, wherein: The two sides of the bearing part (32) are provided with mounting grooves (321) extending along the length direction of the bearing part (32), and the rotating ring (41) and the transmission shaft (51) are arranged in the mounting grooves (321); the bearing part (32) is provided with a protective cover (324) covering the rotating ring (41) and the transmission shaft (51) in the mounting grooves (321).

6. The range-extended oil-electric fork truck of claim 5, wherein: The bottom of the bearing part (32) is provided with a containing groove (323) for the rotation of the limiting member (4) to be embedded, and the containing groove (323) is in communication with the mounting groove (321).

7. The range-extended oil-electric fork truck of claim 3, wherein: The motor assembly (6) comprises a speed reducer motor (61) and a gear box (62) connected with the speed reducer motor; the transmission shaft (51) is provided with two roots corresponding to two groups of limiting members (4); the gear box (62) is provided with two output ends (621), and the two output ends (621) are connected with two transmission shafts (51) respectively, and the driving force of the speed reducer motor (61) is converted into the rotating force of the two transmission shafts (51) which are synchronous but opposite by the gear box (62).

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