A width-adjustable unmanned fork truck

Abstract

This invention relates to the field of unmanned forklift technology and discloses an unmanned forklift with adjustable outrigger width. The forklift includes a forklift body with outriggers on both its left and right sides. Crossbeams are fixedly mounted at the rear ends of both sets of outriggers. Two sets of support frames are fixedly mounted on the bottom wall inside the forklift body. A spacing adjustment component is provided between the two sets of crossbeams. A connecting component is inserted through the support frame, and a limit component is slidably connected to the front side of the support frame. A motor drives a driving bevel gear to rotate, which in turn drives a driven bevel gear to rotate, causing gear one to intermittently mesh with gear two, and driving a threaded rod to rotate. When gear one and gear two are meshing, the insertion rod remains pulled out of its insertion hole. During the rotation of the threaded rod, the crossbeams and crossarms move along the support frames, adjusting the spacing between the two sets of outriggers; thus achieving convenient adjustment of the spacing between the outriggers.

Description

Technical Field

[0001] This invention relates to the field of unmanned forklift technology, specifically to an unmanned forklift with adjustable outrigger width. Background Technology

[0002] AGV forklifts (Automated Guided Vehicles), as core equipment in intelligent logistics, integrate automated navigation, precise control, and efficient handling capabilities, and have been widely used in industrial warehousing scenarios. In a standard wide-leg AGV forklift, the outer legs are sized according to the pallet dimensions, and the legs and frame are welded together.

[0003] For fixed-leg AGV forklifts, once manufactured, if the pallet size is larger than the confirmed pallet size, the forklift legs will collide with the pallet, making it impossible to pick up large pallets. If the pallet size is smaller than the confirmed pallet size, the distance between the forklift legs and the pallet will be large, resulting in a large turning radius for the vehicle, making it unusable in narrow aisles. Therefore, further improvements are needed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an unmanned forklift with adjustable outrigger width, which has advantages such as convenient outrigger width adjustment and solves the problem of fixed and non-adjustable outrigger width in forklifts.

[0005] To achieve the aforementioned goal of conveniently adjusting the width of the outriggers, the present invention provides the following technical solution: an unmanned forklift with adjustable outrigger width, comprising a forklift body, outriggers on both the left and right sides of the forklift body, wheels rotatably connected to the front ends of the outriggers, crossbeams fixedly installed at the rear ends of both sets of outriggers, two sets of support frames fixedly installed on the bottom wall inside the forklift body, the crossbeams slidingly connected within the support frames, a spacing adjustment component between the two sets of crossbeams, a connecting component inserted through the support frames, positioning holes arrayed on the crossbeams, the connecting component passing through the positioning holes, a limit component slidably connected to the front side of the support frames, the limit component engaging with the front end of the connecting component; a transmission component between the spacing adjustment component and the connecting component, and a reciprocating pusher between the top of the transmission component and the limit component.

[0006] Preferably, the spacing adjustment component includes a motor, the output end of the motor is connected to a driving bevel gear, both sides of the driving bevel gear are meshed with driven bevel gears, and a rotating shaft is fixedly installed at the center of the opposite side of the two driven bevel gears; a gear one is fixedly installed on the surface of the rotating shaft, a gear two is meshed on the front side of the gear one, a threaded rod is fixedly installed at the center of the gear two, and a cross arm is fixedly installed on the rear side of the opposite end of the two sets of crossbeams, and the two cross arms are respectively threadedly connected to the two threaded rods.

[0007] Preferably, the first gear is a half gear, wherein one half of the circumferential surface of the first gear has a toothed tooth, and the other half of the circumferential surface is a smooth surface.

[0008] Preferably, the connecting assembly includes a slide rail located on the rear side of the support frame and fixedly installed on the bottom wall of the forklift body. An L-shaped slide block is slidably connected to the top of the slide rail. Two sets of clamping plates are fixedly installed on the rear side of the L-shaped slide block, and an inclined groove is formed through the surface of the clamping plate. Four sets of insert rods are fixedly arranged in an array on the front side of the L-shaped slide block, and an annular groove is formed on the circumferential surface of the front end of the insert rod. Insertion holes are arranged in an array on the surface of the support frame, and the insert rods pass through the insertion holes and positioning holes.

[0009] Preferably, the limiting component includes a baffle, a straight groove is formed through the middle of the baffle, a boss is fixedly installed on the front side of the support frame, the baffle is slidably connected to the boss through the straight groove, and limiting grooves are formed through the baffle surface in an array. The width of the lower half of the limiting groove is equal to the diameter of the mounting frame, and the width of the upper half of the limiting groove is equal to the diameter of the mounting frame at the slide rod.

[0010] Preferably, the transmission assembly includes a rotating cylinder fixedly installed at the end of a rotating shaft. An annular guide groove is formed on the circumferential surface of the rotating cylinder. A collar is fitted on the outer side of the rotating cylinder, and a sliding ball is fixedly installed on the inner wall of the collar, the sliding ball being slidably connected in the annular guide groove. A slider is fixedly installed at the bottom of the collar. A guide rod is provided below the rotating cylinder, the guide rod being fixedly installed on the inner wall of the forklift body, and the slider being slidably connected to the guide rod. A push plate is fixedly installed on the front side of the collar, and a sliding column is fixedly installed at the top and bottom of the front end of the push plate.

[0011] Preferably, the annular guide groove includes a semicircular groove, an inclined groove two, an arc groove and an inclined groove three. The two ends of the semicircular groove are respectively connected to the inclined groove two and the inclined groove three. The ends of the inclined groove two and the inclined groove three away from the semicircular groove are connected by the arc groove. The central angle of the semicircular groove on the circumference of the rotating cylinder is 180°.

[0012] Preferably, the reciprocating pusher includes a U-shaped suspension fixedly installed on the inner wall of the forklift body. Both ends of the U-shaped suspension are rotatably connected to connecting shafts. Turntables are fixedly installed at opposite ends of the two connecting shafts, and gears are fixedly installed at opposite ends of the two connecting shafts. Sliding columns are fixedly installed at the eccentric points on opposite sides of the two turntables. The reciprocating pusher also includes a fixed plate and two sets of sector gears. Two frame plates are fixedly installed at the rear end of the fixed plate. Sliding columns are slidably connected inside the frame plates. The two sector gears are fixedly installed on the rotating drum. During the rotation of the rotating drum, the sector gears mesh with gears.

[0013] Preferably, the number of teeth on the surface of the sector gear is equal to the number of teeth on the gear three, the central angle of the sector gear is equal to the central angle of the arc groove on the circumference of the rotating cylinder, and the distance between the sliding column two and the center of the turntable is equal to the length of the limiting groove.

[0014] Preferably, a mounting bracket is fixedly installed on the front side of the boss, a sliding rod is slidably connected through the surface of the mounting bracket, a friction plate is fixedly installed on the end of the sliding rod near the baffle, the friction plate is in contact with the front side of the baffle, and a spring is fixedly installed between the friction plate and the mounting bracket.

[0015] Compared with the prior art, the present invention provides an unmanned forklift with adjustable outrigger width, which has the following beneficial effects:

[0016] 1. This unmanned forklift with adjustable outrigger width uses a motor to drive the active bevel gear to rotate, which in turn drives the driven bevel gear to rotate. This causes gear one to intermittently mesh with gear two, which in turn drives the threaded rod to rotate. When gear one and gear two are meshing, the insert rod remains pulled out of the insertion hole. During the rotation of the threaded rod, the crossbeam and crossarm move along the support frame, adjusting the distance between the two sets of outriggers. This allows for convenient adjustment of the distance between the outriggers.

[0017] 2. In this unmanned forklift with adjustable outrigger width, after the teeth of gear one and gear two separate, the sliding ball slides into the inclined groove two and continues to rotate with the rotating drum and shaft. The sliding ball slides along the inclined groove two, and the collar moves along the guide rod and gradually moves away from the shaft. The sliding column one presses against one side wall of the inclined groove, causing the L-shaped slide to move forward along the slide rail. The insert rod passes through the insertion hole and positioning hole to position the crossbeam. When the sliding ball slides into the arc groove, the insert rod remains inserted in the insertion hole. As the ball slides along the arc-shaped groove, the sector gear meshes with gear three, driving the turntable to rotate. The sliding column two makes a circular motion, pushing the frame plate, the fixed plate, and the baffle to move up and down reciprocally. When the ball slides to the middle of the arc-shaped groove, the baffle slides down to the lowest point, and the top wall of the limiting groove fits against the inner wall of the annular groove, preventing the insertion rod from detaching from the insertion hole. In reality, as long as the upper half of the limiting groove fits against the surface of the annular groove, it can maintain the limiting effect on the insertion rod, thereby achieving the purpose of limiting the support leg. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of an unmanned forklift with adjustable outrigger width proposed in this invention.

[0019] Figure 2 This is a three-dimensional structural diagram of an unmanned forklift with adjustable outrigger width proposed in this invention, after removing the forklift body.

[0020] Figure 3This is a three-dimensional structural diagram of the outriggers of an unmanned forklift with adjustable outrigger width proposed in this invention.

[0021] Figure 4 This is a three-dimensional structural diagram of the spacing adjustment component of an unmanned forklift with adjustable outrigger width proposed in this invention.

[0022] Figure 5 This is a three-dimensional structural diagram of the connection component of an unmanned forklift with adjustable outrigger width proposed in this invention.

[0023] Figure 6 This is a three-dimensional structural diagram of a limiting component for an unmanned forklift with adjustable outrigger width proposed in this invention.

[0024] Figure 7 This is a three-dimensional structural diagram of the connection component and the limiting component of an unmanned forklift with adjustable outrigger width proposed in this invention, in the snap-fit ​​state.

[0025] Figure 8 This is a three-dimensional structural diagram of the transmission component of an unmanned forklift with adjustable outrigger width proposed in this invention.

[0026] Figure 9 This is a schematic diagram of the rotating drum structure of an unmanned forklift with adjustable outrigger width proposed in this invention.

[0027] Figure 10 This is a schematic diagram of the rotating drum structure of an unmanned forklift with adjustable outrigger width proposed in this invention.

[0028] Figure 11 This is a three-dimensional structural diagram of the reciprocating pusher of an unmanned forklift with adjustable outrigger width proposed in this invention.

[0029] Figure 12 This is a cross-sectional view of the rotating drum of an unmanned forklift with adjustable outrigger width proposed in this invention, located at the arc-shaped groove.

[0030] In the diagram: 100, forklift body; 200, outriggers; 300, crossbeam; 400, support frame; 500, spacing adjustment component; 600, connecting assembly; 700, limit assembly; 800, transmission assembly; 900, reciprocating push component;

[0031] 201. Wheel; 301. Positioning hole; 401. Insertion hole; 501. Motor; 502. Driving bevel gear; 503. Driven bevel gear; 504. Shaft; 505. Gear 1; 506. Gear 2; 507. Threaded rod; 508. Cross arm;

[0032] 601. Slide rail; 602. L-shaped slide block; 603. Clamping plate; 604. Inclined groove one; 605. Insert rod; 606. Annular groove;

[0033] 701. Baffle; 702. Straight groove; 703. Boss; 704. Limiting groove; 705. Mounting bracket; 706. Slide rod; 707. Friction plate; 708. Spring;

[0034] 801. Rotary drum; 802. Annular guide groove; 803. Collar; 804. Sliding ball; 805. Sliding block; 806. Guide rod; 807. Push plate; 808. Sliding column one; 8021. Semicircular groove; 8022. Inclined groove two; 8023. Arc groove; 8024. Inclined groove three;

[0035] 901. U-shaped suspension; 902. Connecting shaft; 903. Turntable; 904. Gear three; 905. Sliding column two; 906. Frame plate; 907. Fixing plate; 908. Sector gear. Detailed Implementation

[0036] 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.

[0037] Please see Figures 1-3 An unmanned forklift with adjustable outrigger width includes a forklift body 100. Outriggers 200 are provided on both the left and right sides of the forklift body 100. Wheels 201 are rotatably connected to the front ends of each outrigger 200. Crossbeams 300 are fixedly installed at the rear ends of both sets of outriggers 200. Two sets of support frames 400 are fixedly installed on the bottom wall inside the forklift body 100. The crossbeams 300 are slidably connected within the support frames 400, which support and guide the crossbeams 300. A spacing adjustment component 500 is provided between the two sets of crossbeams 300. The spacing adjustment component 500 is used to drive the two sets of crossbeams 300 to move simultaneously towards each other or simultaneously away from each other, thereby adjusting the spacing between the two sets of outriggers 200.

[0038] A connecting component 600 is inserted through the support frame 400. The surface of the support frame 400 has an array of insertion holes 401, and the crossbeam 300 has an array of positioning holes 301. The spacing of the array of insertion holes 401 is an integer multiple of the spacing of the array of positioning holes 301. The connecting component 600 passes through the positioning holes 301. A limiting component 700 is slidably connected to the front side of the support frame 400. The limiting component 700 is engaged with the front end of the connecting component 600. Thus, after adjusting the spacing between the two sets of support legs 200, the crossbeam 300 is limited by the connecting component 600 and the limiting component 700. A transmission component 800 is provided between the spacing adjustment component 500 and the connecting component 600. The spacing adjustment component 500 and the transmission component 800 drive the connecting component 600 to reciprocate in the front-back direction, thereby causing the connecting component 600 to intermittently insert into the support frame 400 and the crossbeam 300. A reciprocating pusher 900 is provided between the transmission component 800 and the top of the limiting component 700. The spacing adjustment component 500, the transmission component 800 and the reciprocating pusher 900 drive the limiting component 700 to reciprocate up and down. After the connecting component 600 is inserted into the support frame 400 and the crossbeam 300, the limiting component 700 moves downward, so that the front end of the connecting component 600 is engaged with the limiting component 700.

[0039] Please see Figure 4 The spacing adjustment component 500 includes a motor 501. A driving bevel gear 502 is connected to the front output end of the motor 501. Driven bevel gears 503 mesh with both sides of the driving bevel gear 502. A rotating shaft 504 is fixedly installed at the center of the opposite sides of each of the two driven bevel gears 503. The rotating shaft 504 is rotatably connected inside the forklift body 100. The motor 501 drives the driving bevel gear 502 to rotate, which in turn drives the two driven bevel gears 503 to rotate in opposite directions.

[0040] A gear 505 is fixedly mounted on the surface of the rotating shaft 504. A gear 506 meshes with the front side of the gear 505. The gear 505 is a half gear, with teeth on one half of its circumference and a smooth surface on the other half. The number of teeth on the gear 505 is half the number of teeth on the gear 506. Thus, during the rotation of the driven bevel gear 503, the gear 505 intermittently meshes with the gear 506. For every revolution of the driven bevel gear 503 and the rotating shaft 504, the threaded rod 507 rotates half a revolution. A threaded rod 507 is fixedly mounted at the center of the gear 506. A cross arm 508 is fixedly mounted on the rear side of each of the two sets of crossbeams 300 at opposite ends. Threaded holes are opened on the cross arms 508, and the two cross arms 508 are threadedly connected to the two threaded rods 507 respectively. Thus, when the threaded rod 507 rotates, it drives the two crossbeams 300 to move towards or away from each other.

[0041] Please see Figures 8-10The transmission assembly 800 includes a rotating cylinder 801 fixedly mounted at the end of a rotating shaft 504. An annular guide groove 802 is formed on the circumferential surface of the rotating cylinder 801. A collar 803 is fitted around the outer side of the rotating cylinder 801, and a sliding ball 804 is fixedly mounted on the inner wall of the collar 803, slidably connected within the annular guide groove 802. A slider 805 is fixedly mounted at the bottom of the collar 803. A guide rod 806 is provided below the rotating cylinder 801, fixedly mounted on the inner wall of the forklift body 100, and the slider 805 is slidably connected to the guide rod 806. During the rotation of the rotating cylinder 801, the sliding ball 804 slides along the annular guide groove 802, causing the collar 803 to reciprocate along the guide rod 806.

[0042] The annular guide groove 802 includes a semicircular groove 8021, an inclined groove 8022, an arc-shaped groove 8023, and an inclined groove 8024. The two ends of the semicircular groove 8021 are connected to the inclined grooves 8022 and 8024 respectively. The ends of the inclined grooves 8022 and 8024 furthest from the semicircular groove 8021 are connected by the arc-shaped groove 8023. The central angle of the semicircular groove 8021 on the circumference of the rotating cylinder 801 is 180°. The inclined grooves 8022 and 8024 are symmetrically arranged about the middle of the arc-shaped groove 8023. When gear 505 meshes with gear 506, the sliding ball 804 slides along the semicircular groove 8021; at this time, the crossbeam 300 moves along the support frame 400, and the collar 803 remains at the semicircular groove 8021.

[0043] When the teeth of gear 1 505 and gear 2 506 are separated, the sliding ball 804 slides to the ends of the inclined groove 2 8022. Then the rotating drum 801 continues to rotate, the sliding ball 804 slides along the inclined groove 2 8022, and the collar 803 gradually moves away from the rotating shaft 504.

[0044] When the ball bearing 804 slides to the arc groove 8023, the collar 803 remains in the arc groove 8023; then, the rotating drum 801 continues to rotate, and the ball bearing 804 slides along the inclined groove 8024, causing the collar 803 to gradually approach the rotating shaft 504.

[0045] Please see Figures 5-7The connecting component 600 includes a slide rail 601, which is located on the rear side of the support frame 400 and fixedly installed on the bottom wall of the forklift body 100. An L-shaped slide block 602 is slidably connected to the top of the slide rail 601. Two sets of clamping plates 603 are fixedly installed on the rear side of the L-shaped slide block 602, and inclined grooves 604 are formed through the surface of the clamping plates 603. A push plate 807 is fixedly installed on the front side of the collar 803, and sliding columns 808 are fixedly installed on the top and bottom of the front end of the push plate 807. The two sets of clamping plates 603 are respectively clamped on the upper and lower sides of the push plate 807, and the sliding columns 808 are slidably connected within the inclined grooves 604. Four sets of insert rods 605 are fixedly arranged in an array on the front side of the L-shaped slide block 602. An annular groove 606 is formed on the circumferential surface of the front end of the insert rod 605; the insert rod 605 passes through the insertion hole 401 and the positioning hole 301.

[0046] When the ball bearing 804 slides along the second inclined groove 8022, the push plate 807 gradually moves away from the rotating shaft 504, thereby the first sliding column 808 presses against the side wall of the first inclined groove 604, causing the L-shaped slide block 602 to move forward along the slide rail 601, and the insertion rod 605 is inserted into the insertion hole 401 and the positioning hole 301; when the ball bearing 804 slides along the arc groove 8023, the insertion rod 605 remains inserted into the insertion hole 401 and the positioning hole 301; when the ball bearing 804 slides along the third inclined groove 8024, the insertion rod 605 is gradually pulled out from the insertion hole 401 and the positioning hole 301; when the ball bearing 804 slides along the semi-circular groove 8021, the insertion rod 605 remains pulled out from the insertion hole 401 and the positioning hole 301.

[0047] Please see Figures 5-7 The limiting component 700 includes a baffle 701, with a straight groove 702 extending through the middle of the baffle 701. A boss 703 is fixedly installed on the front side of the support frame 400. The baffle 701 is slidably connected to the boss 703 through the straight groove 702. The rear half of the boss 703 passes through the straight groove 702, and the front half of the boss 703 is attached to the surface of the baffle 701.

[0048] A limiting groove 704 is formed through the surface array of the baffle 701. The width of the lower half of the limiting groove 704 is equal to the diameter of the mounting bracket 705, and the width of the upper half of the limiting groove 704 is equal to the diameter of the mounting bracket 705 at the slide rod 706. When the insertion rod 605 is inserted into the insertion hole 401 and the positioning hole 301, the lower half of the limiting groove 704 communicates with the insertion hole 401, allowing the insertion rod 605 to be smoothly inserted into the limiting groove 704. Afterward, the baffle 701 moves downward, causing the top wall of the limiting groove 704 to fit against the inner wall of the annular groove 606, thereby locking the insertion rod 605 onto the baffle 701 and preventing the insertion rod 605 from being pulled out of the insertion hole 401.

[0049] Please see Figures 11-12The reciprocating pusher 900 includes a U-shaped suspension 901 fixedly installed on the inner wall of the forklift body 100. Both ends of the U-shaped suspension 901 are rotatably connected to connecting shafts 902. Turntables 903 are fixedly installed at opposite ends of the two connecting shafts 902, and gears 904 are fixedly installed at opposite ends of the two connecting shafts 902. Sliding columns 905 are fixedly installed at the eccentric points on opposite sides of the two turntables 903. The reciprocating pusher 900 also includes a fixed plate 907 and two sets of sector gears 908. Two frame plates 906 are fixedly installed at the rear end of the fixed plate 907, and the sliding columns 905 are slidably connected within the frame plates 906. Thus, when the turntables 903 rotate, the sliding columns 905 perform circular motion, pushing the frame plates 906 to reciprocate up and down, thereby causing the baffle 701 to reciprocate up and down relative to the boss 703. The distance between the center of slide column 905 and turntable 903 is equal to the length of limit groove 704.

[0050] Two sector gears 908 are fixedly mounted on the rotating drum 801. During the rotation of the rotating drum 801, the sector gears 908 mesh with the third gear 904. The number of teeth on the surface of the sector gears 908 is equal to the number of teeth on the third gear 904, and the central angle of the sector gears 908 is equal to the central angle of the arc groove 8023 on the circumference of the rotating drum 801.

[0051] As the ball bearing 804 slides along the arc-shaped groove 8023, the sector gear 908 meshes with the gear three 904, the sliding column two 905 rotates one revolution, and the frame plate 906, the fixed plate 907, and the baffle 701 reciprocate once. When the ball bearing 804 slides to the middle of the arc-shaped groove 8023, the turntable 903 rotates half a revolution, and the baffle 701 moves downward, so that the top of the limiting groove 704 connects with the insertion hole 401.

[0052] Please see Figure 6 A mounting bracket 705 is fixedly installed on the front side of the boss 703. A sliding rod 706 is slidably connected through the surface of the mounting bracket 705. A friction plate 707 is fixedly installed on one end of the sliding rod 706 near the baffle 701. The friction plate 707 is in contact with the front side of the baffle 701. A spring 708 is fixedly installed between the friction plate 707 and the mounting bracket 705. The elasticity of the spring 708 keeps the friction plate 707 in close contact with the surface of the baffle 701, preventing the baffle 701 from moving downward under the action of gravity. This allows the bottom end of the limiting groove 704 to remain in communication with the insertion hole 401.

[0053] In use, the motor 501 drives the active bevel gear 502 to rotate, which in turn drives the driven bevel gear 503 to rotate, causing gear 1 505 to intermittently mesh with gear 2 506, and driving the threaded rod 507 to rotate.

[0054] When gear 1 505 and gear 2 506 are engaged, the insertion rod 605 remains pulled out of the insertion hole 401. During the rotation of the threaded rod 507, the crossbeam 300 and the cross arm 508 are moved along the support frame 400 to adjust the distance between the two sets of support legs 200.

[0055] After the gear 1 505 and gear 2 506 are separated, the sliding ball 804 slides into the inclined groove 2 8022 and continues to rotate with the rotating cylinder 801 and the rotating shaft 504. The sliding ball 804 slides along the inclined groove 2 8022, and the collar 803 moves along the guide rod 806 and gradually moves away from the rotating shaft 504. The sliding column 1 808 presses against the side wall of the inclined groove 1 604, causing the L-shaped slide block 602 to move forward along the slide rail 601. The insertion rod 605 passes through the insertion hole 401 and the positioning hole 301 to position the crossbeam 300.

[0056] When the ball bearing 804 slides into the arc groove 8023, the rod 605 remains inserted into the socket 401.

[0057] As the ball bearing 804 slides along the arc groove 8023, the sector gear 908 meshes with the gear 3 904, causing the turntable 903 to rotate, the sliding column 2 905 to make circular motion, and pushing the frame plate 906, the fixed plate 907 and the baffle 701 to move up and down reciprocally.

[0058] When the ball bearing 804 slides to the middle of the arc groove 8023, the baffle 701 slides down to the lowest point, and the top wall of the limiting groove 704 fits against the inner wall of the annular groove 606 to prevent the insertion rod 605 from disengaging from the insertion hole 401. In reality, as long as the upper half of the limiting groove 704 fits against the surface of the annular groove 606, it can maintain the limiting effect on the insertion rod 605.

[0059] As the ball bearing 804 continues to slide from the middle of the arc-shaped groove 8023, the baffle 701 moves upward, connecting the lower half of the limiting groove 704 with the insertion hole 401, allowing the insertion rod 605 to be smoothly pulled out from the limiting groove 704. Then, the ball bearing 804 slides along the inclined groove 8024, and the insertion rod 605 is pulled out from the insertion hole 401. Finally, when the ball bearing 804 slides into the semi-circular groove 8021, the insertion rod 605 remains in the state of being pulled out from the insertion hole 401. At this time, gear 1 505 meshes with gear 2 506 again.

[0060] 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. An adjustable width unmanned forklift truck, comprising a forklift truck body (100), both sides of the forklift truck body (100) are provided with a support leg (200), the front end of the support leg (200) is rotatably connected with a wheel (201), the rear end of two groups of support legs (200) are fixedly installed with a cross beam (300), characterized in that: Two groups of support frames (400) are fixedly installed on the bottom wall inside the forklift body (100), the cross beams (300) are slidingly connected in the support frames (400), spacing adjusting pieces (500) are arranged between the two groups of cross beams (300), connecting assemblies (600) are penetratingly inserted into the support frames (400), positioning holes (301) are arrayed on the cross beams (300), the connecting assemblies (600) pass through the positioning holes (301), limit assemblies (700) are slidingly connected to the front side of the support frames (400), and the limit assemblies (700) are clamped to the front end of the connecting assemblies (600); Transmission assemblies (800) are arranged between the spacing adjusting pieces (500) and the connecting assemblies (600), and reciprocating pushing pieces (900) are arranged between the transmission assemblies (800) and the top of the limit assemblies (700); The spacing adjusting piece (500) comprises a motor (501), the front side output end of the motor (501) is connected with a driving bevel gear (502), the left and right sides of the driving bevel gear (502) are engaged with driven bevel gears (503), and the centers of the opposite sides of the two driven bevel gears (503) are fixedly installed with rotating shafts (504); Gear one (505) is fixedly installed on the surface of the rotating shaft (504), gear two (506) is engaged with the front side of the gear one (505), the center of the gear two (506) is fixedly installed with a threaded rod (507), and horizontal arms (508) are fixedly installed on the rear side of the opposite ends of the two groups of cross beams (300); Gear one (505) is a half gear, one half of the circumferential surface of the gear one (505) has a clamping tooth, and the other half of the circumferential surface is a smooth surface; The connecting assembly (600) comprises a sliding rail (601), the sliding rail (601) is located on the rear side of the support frame (400) and is fixedly installed on the bottom wall of the forklift body (100), the top of the sliding rail (601) is slidingly connected with an L-shaped sliding seat (602), two groups of clamping plates (603) are fixedly installed on the rear side of the L-shaped sliding seat (602), and inclined grooves one (604) are penetratingly formed in the surface of the clamping plates (603); Four groups of inserting rods (605) are fixedly arranged on the front side of the L-shaped sliding seat (602), and annular clamping grooves (606) are formed in the circumferential surface of the front end of the inserting rods (605); Insertion holes (401) are arrayed on the surface of the support frame (400), and the inserting rods (605) pass through the insertion holes (401) and the positioning holes (301); The transmission assembly (800) comprises a rotating cylinder (801) fixedly installed at the end of the rotating shaft (504), an annular guide groove (802) is formed in the circumferential surface of the rotating cylinder (801), a sleeve ring (803) is sleeved on the outer side of the rotating cylinder (801), a sliding ball (804) is fixedly installed on the inner wall of the sleeve ring (803), and the sliding ball (804) is slidingly connected in the annular guide groove (802). The sleeve ring (803) is fixedly installed with a sliding block (805) at the bottom, a guide rod (806) is arranged below the rotating drum (801), the guide rod (806) is fixedly installed on the inner wall of the forklift body (100), and the sliding block (805) is slidingly connected to the guide rod (806); The sleeve ring (803) is fixedly installed with a push plate (807) at the front side, sliding columns (808) are fixedly installed at the top and bottom of the front end of the push plate (807), and the sliding columns (808) are slidingly connected in inclined grooves (604); The annular guide groove (802) comprises a semicircular groove (8021), an inclined groove two (8022), an arc-shaped groove (8023) and an inclined groove three (8024), the two ends of the semicircular groove (8021) are communicated with the inclined groove two (8022) and the inclined groove three (8024) respectively, and the inclined groove two (8022) and the inclined groove three (8024) are communicated through the arc-shaped groove (8023) away from the semicircular groove (8021). The central angle of the semicircular groove (8021) on the circumferential surface of the rotating drum (801) is 180°.

2. The width adjustable wheel base of the unmanned fork truck according to claim 1, characterized in that: The limiting assembly (700) comprises a baffle (701), a linear slot (702) is formed through the middle of the baffle (701), a boss (703) is fixedly installed on the front side of the support frame (400), the baffle (701) is slidingly connected to the boss (703) through the linear slot (702), a limiting slot (704) is formed through the surface of the baffle (701) in an array, the width of the lower half of the limiting slot (704) is equal to the diameter of the mounting bracket (705), and the width of the upper half of the limiting slot (704) is equal to the diameter of the mounting bracket (705) at the sliding rod (706).

3. The width adjustable wheel base of the unmanned fork truck according to claim 1, characterized in that: The reciprocating pushing piece (900) comprises a U-shaped suspension (901) fixedly installed on the inner wall of the forklift body (100), connecting shafts (902) are rotatably connected at both ends of the U-shaped suspension (901), rotating discs (903) are fixedly installed at opposite ends of the two connecting shafts (902), gear three (904) is fixedly installed at the opposite ends of the two connecting shafts (902), and sliding columns two (905) are fixedly installed at the eccentric positions of opposite sides of the two rotating discs (903). The reciprocating pushing piece (900) further comprises a fixed plate (907) and two groups of sector gears (908), the fixed plate (907) is fixedly installed with two frame-shaped plates (906) at the rear end, the sliding columns two (905) are slidingly connected in the frame-shaped plates (906), and the two sector gears (908) are fixedly installed on the rotating drum (801). During rotation of the rotating drum (801), the sector gears (908) are engaged with the gear three (904).

4. The width adjustable wheel base of the unmanned fork truck according to claim 3, characterized in that: The number of the card teeth on the surface of the sector gear (908) is equal to the number of the card teeth of the gear three (904), the central angle of the sector gear (908) is equal to the central angle of the arc-shaped groove (8023) on the circumferential surface of the rotating drum (801), and the distance between the slide column two (905) and the center of the rotating disc (903) is equal to the length of the limiting groove (704).

5. The width adjustable wheel base of the unmanned fork truck of claim 2, wherein: The front side of the boss (703) is fixedly provided with a mounting rack (705), a sliding rod (706) is slidably connected to the surface of the mounting rack (705), a friction plate (707) is fixedly connected to the end of the sliding rod (706) close to the baffle (701), the friction plate (707) is attached to the front side of the baffle (701), and the spring (708) is fixedly connected between the friction plate (707) and the mounting rack (705).

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