A multifunctional multi-angle adjustable stacker

Abstract

The present invention relates to the technical field of stacking equipment, and in particular to a multifunctional multi-angle adjustable stacker, which mainly solves the problem of significant space utilization restriction in actual application of stackers in the prior art. The stacker comprises a control system, a chassis, wheels, a power system, a steering system, a driver's cabin, a connecting frame, an outer door frame, an inner door frame, a lifting frame, a fork arm device, a first guide device, a second guide device, a rotating shaft, a lifting drive device, a rotating drive device and a counterweight device. The outer door frame is arranged at the front end of the chassis, the first guide device is arranged on the outer door frame, the inner door frame is arranged on the first guide device, the second guide device is arranged on the inner door frame, the lifting frame is arranged on the second guide device, the lifting drive device is connected to the lifting frame and the inner door frame, the fork arm device is arranged on the lifting frame through the rotating shaft, the rotating drive device is connected to the rotating shaft, the driver's cabin is fixedly connected to the inner door frame through the connecting frame, and the counterweight device is arranged at the rear end of the chassis.

Description

Technical Field

[0001] The present invention relates to the technical field of stacking equipment, in particular to a multifunctional multi-angle adjustable stacker. Background Art

[0002] In the modern warehousing and logistics system, forklifts, as the core equipment for vertical material handling, are widely used in shelf storage and retrieval operations of palletized goods due to their high load capacity and flexible lifting characteristics. However, traditional forklifts have significant space utilization constraints in actual applications, namely: counterbalanced forklifts generally have a large turning radius, usually requiring 3 to 4 meters, and the body length exceeds the limit, with conventional models having a length of ≥2.5 meters. According to the ISO 3691 safety standard, the main aisle width of this type of equipment is required to be at least 3.5 to 4.2 meters when operating, in order to complete 90° turns and emergency braking operations. This design specification directly leads to approximately 30% to 40% of the plane space in the storage shelf layout being fixedly designated as equipment passage areas, severely compressing the effective storage area;

[0003] Experimental data shows that under traditional warehouse layouts, the shelf area volume ratio can only reach 55% to 65%, an efficiency gap of over 25% compared to the theoretical maximum. This not only directly increases storage rental costs per unit of goods by approximately 0.8 to 1.2 yuan per cubic meter per day, but also reduces order processing time by 18% to 22% due to longer picking routes. Especially amid the explosive growth of e-commerce, storage capacity bottlenecks have become a key factor restricting the throughput of logistics centers. Summary of the Invention

[0004] Therefore, in order to solve the above problems, the present invention provides a multifunctional and multi-angle adjustable stacker, which mainly solves the problem of significant space utilization restriction in actual application of stackers in the prior art.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A multifunctional multi-angle adjustable stacker, comprising a control system, a chassis, wheels, a power system, a steering system, a cockpit, a connecting frame, an outer door frame, an inner door frame, a lifting frame, a fork arm device, a first guide device, a second guide device, a rotating shaft, a lifting drive device, a rotating drive device and a counterweight device, wherein the longitudinal direction extending along the length direction of the chassis is defined as the longitudinal direction, and the width direction extending along the chassis is defined as the transverse direction. The wheels are arranged on the chassis, the power system is connected to the wheels for driving the chassis to move, the steering system is connected to the wheels for driving the chassis to turn, the outer door frame is arranged at the front end of the chassis, and the first guide device is arranged at the outer On the mast, the inner door is mounted on the first guide device, the second guide device is mounted on the inner mast, the lifting frame is mounted on the second guide device, the lifting drive device is connected to the lifting frame and the inner mast, and is used to drive the lifting and lowering movement of the lifting frame and the inner mast, the fork arm device is arranged on the lifting frame through a rotating shaft, the rotary drive device is connected to the rotary shaft, and is used to drive the fork arm device to swing laterally, the cockpit is fixedly connected to the inner mast through a connecting frame, the counterweight device is arranged at the rear end of the chassis, and the power system, steering system, fork arm device, lifting drive device, rotary drive device, and counterweight device are electrically connected to the control system respectively;

[0007] The counterweight device includes a fixed counterweight block and a movable counterweight assembly, wherein the fixed counterweight block is fixedly mounted on the rear end of the chassis, and the movable counterweight assembly is mounted on the fixed counterweight block and reciprocates in the transverse direction. The movable counterweight assembly includes a transverse guide mechanism distributed in the transverse direction, a counterweight block mounted on the transverse guide mechanism, and a driving mechanism connected to the counterweight block.

[0008] The control system includes a controller, a first pressure sensor for detecting the weight of the cargo on the fork arm device, a second pressure sensor for detecting the weight of the counterweight, a first distance sensor for detecting the distance between the cargo on the fork arm device and the rotation center of the rotating shaft, a second distance sensor for detecting the distance between the counterweight and the midpoint of the transverse guide mechanism, and an angle sensor for detecting the rotation angle of the fork arm device. The first pressure sensor, the second pressure sensor, the first distance sensor, the second distance sensor, and the angle sensor are electrically connected to the input end of the controller respectively.

[0009] Furthermore, the fork arm device includes a support frame, two support arms with one end fixedly connected to the support frame and distributed in parallel, two fork arms respectively mounted on the support arms and sliding along the support arms, and a hydraulic cylinder that drives the fork arms to move longitudinally.

[0010] Furthermore, a crossbeam is connected between the two support arms, and both ends of the hydraulic cylinder are respectively connected to the crossbeam and the support frame.

[0011] Furthermore, the control method of the control system includes the following steps:

[0012] A. Predetermine the center of the lateral guide mechanism and the distance of the lateral guide mechanism and input it into the controller;

[0013] B. When there is no cargo on the fork arm, the controller controls the counterweight to be located at the center of the transverse guide mechanism. Department;

[0014] C. When there is cargo on the fork arm, the controller controls the first pressure sensor, the second pressure sensor, the first distance sensor, the second distance sensor, and the angle sensor to obtain detection data in real time and transmit the detection data to the controller;

[0015] D. The controller calculates the distance the counterweight moves due to the rotation of the fork arm using the following formula, thereby adjusting the position of the counterweight in real time;

[0016] ;

[0017] in, is the distance the counterweight moves due to the rotation of the fork arm; is the weight of the fork arm cargo; is the weight of the counterweight; is the fork arm rotation angle; is the distance from the fork arm to the center of rotation;

[0018] E. When the fork arm rotates, the controller obtains the distance the counterweight moves due to the fork arm rotation Distance from the lateral guide mechanism and compared, when When the fork arm continues to rotate; when When the fork arm rotates, it stops and prompts you to add the counterweight.

[0019] Furthermore, the rotation drive device includes a worm gear provided on the rotating shaft, a worm rotatably provided on the lifting frame and meshing with the worm gear, and a hydraulic motor driving the worm gear to rotate.

[0020] Furthermore, the chassis is provided with a recessed groove for the lower part of the cockpit to be embedded in.

[0021] By adopting the above technical solution, the beneficial effects of the present invention are as follows: this multifunctional multi-angle adjustable forklift drives the fork arm device to swing laterally along the rotation axis by setting a rotary drive device, and at the same time integrates the multi-stage lifting guide structure and the chassis steering system with the fork arm device, which significantly reduces the turning radius of the equipment, specifically to 2.2 to 2.8 meters, and reduces the main channel width requirement to 2.8 to 3.3 meters, which is more than 20% less than the ISO standard. This design can increase the shelf area volume ratio to 72% to 78%, reduce the unit storage cost by about 0.5 yuan / cubic meter*day, and shorten the picking path by more than 15%, greatly improving the utilization rate of storage space. In addition, the cockpit is connected to the inner mast to achieve synchronous lifting and lowering of the cockpit and the inner mast, which facilitates observation of the specific position of the fork arm device, is conducive to precise forking and unloading, and improves safety and work efficiency. At the same time, the cockpit balances the fork arm device and the cargo on the other side of the inner mast, thereby improving the stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a front view structural schematic diagram of an embodiment of the present invention;

[0023] Figure 2 1 is a front view structural diagram of a cockpit in an elevated state according to an embodiment of the present invention;

[0024] Figure 3 1 is a schematic diagram of a top view of the fork arm device in a straightened state according to an embodiment of the present invention;

[0025] Figure 4 2 is a schematic top view of the structure of the fork arm device in the embodiment of the present invention when it is swung 90° to the right;

[0026] Figure 5 1 is a schematic diagram of the top view of the structure of the fork arm device in the embodiment of the present invention when it is swung 90° to the left;

[0027] Figure 6 2. It is a schematic top view of the structure of the fork arm device and the counterweight device in the upright state according to an embodiment of the present invention;

[0028] Figure 7 2. It is a schematic top view of the structure of the fork arm device and the counterweight device in the state of swinging 90° to the right in an embodiment of the present invention;

[0029] Figure 8 2. It is a schematic top view of the structure of the fork arm device and the counterweight device in the state of swinging 90° to the left in an embodiment of the present invention;

[0030] Figure 9 It is a circuit module diagram of an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. Control system; 2. Chassis; 3. Wheels; 4. Power system; 5. Steering system; 6. Cockpit; 7. Connecting frame; 8. Outer mast; 9. Inner mast; 10. Lifting frame; 11. Fork arm device; 12. First guide device; 13. Second guide device; 14. Rotating shaft; 15. Lifting drive device; 16. Rotating drive device; 17. Counterweight device; 18. Gap slot

[0033] 101. Controller; 102. First pressure sensor; 103. Second pressure sensor; 104. First distance sensor; 105. Second distance sensor; 106. Angle sensor; 111. Support frame; 112. Support arm; 113. Fork arm; 114. Hydraulic cylinder; 115. Crossbeam;

[0034] 161. Worm gear; 162. Worm; 163. Hydraulic motor; 171. Fixed counterweight; 173. Lateral guide mechanism; 174. Counterweight; 175. Drive mechanism. DETAILED DESCRIPTION

[0035] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0036] The embodiments of the present invention are:

[0037] refer to Figures 1 to 9 As shown, a multifunctional multi-angle adjustable stacker includes a control system 1, a chassis 2, wheels 3, a power system 4, a steering system 5, a cockpit 6, a connecting frame 7, an outer mast 8, an inner mast 9, a lifting frame 10, a fork arm device 11, a first guide device 12, a second guide device 13, a rotating shaft 14, a lifting drive device 15, a rotating drive device 16 and a counterweight device 17. The longitudinal direction extending along the length direction of the chassis 2 is defined as the longitudinal direction, and the transverse direction extending along the width direction of the chassis 2 is defined as the transverse direction. The wheels 3 are provided on the chassis 2, the power system 4 is connected to the wheels 3 for driving the chassis 2 to move, the steering system 5 is connected to the wheels 3 for driving the chassis 2 to turn, the outer mast 8 is provided at the front end of the chassis 2, and the first guide device 12 is provided on the outer mast 8. The inner mast 9 is arranged on the first guide device 12, the second guide device 13 is arranged on the inner mast 9, the lifting frame 10 is arranged on the second guide device 13, the lifting drive device 15 is connected with the lifting frame 10 and the inner mast 9, and is used to drive the lifting movement of the lifting frame 10 and the inner mast 9, the fork arm device 11 is arranged on the lifting frame 10 through the rotating shaft 14, the rotating drive device 16 is connected with the rotating shaft 14, and is used to drive the fork arm device 11 to swing laterally, the cockpit 6 is fixedly connected to the inner mast 9 through the connecting frame 7, the counterweight device 17 is arranged at the rear end of the chassis 2, and the power system 4, the steering system 5, the fork arm device 11, the lifting drive device 15, the rotating drive device 16, and the counterweight device 17 are respectively electrically connected to the control system 1.

[0038] In this embodiment, the power system 4, the steering system 5, the lifting drive device 15, the first guide device 12, and the second guide device 13 are existing technologies and will not be described in detail here.

[0039] This multifunctional multi-angle adjustable forklift drives the fork arm device 11 to swing laterally along the rotating shaft 14 by setting a rotary drive device 16, and at the same time integrates a multi-stage lifting guide structure with the fork arm device 11 and a steering system 5 of the chassis 2, which significantly reduces the turning radius of the equipment, specifically to 2.2 to 2.8 meters, and reduces the main channel width requirement to 2.8 to 3.3 meters, which is more than 20% less than the ISO standard. This design can increase the shelf area volume ratio to 72% to 78%, reduce the unit storage cost by about 0.5 yuan / cubic meter*day, and shorten the picking path by more than 15%, greatly improving the utilization rate of storage space. The cockpit 6 is connected to the inner door frame 9 to achieve synchronous lifting and lowering of the cockpit 6 and the inner door frame 9, making it easy to observe the specific position of the fork arm device 11, which is conducive to accurate forking and unloading, improving safety and work efficiency, and at the same time balancing the fork arm device 11 and the cargo on the other side of the inner door frame 9 through the cockpit 6, so that the stability of the equipment is improved.

[0040] Specifically, the fork arm device 11 includes a support frame 111, two support arms 112 fixedly connected to the support frame 111 at one end and distributed in parallel, two fork arms 113 respectively sleeved on the support arms 112 and sliding along the support arms 112, and a hydraulic cylinder 114 for driving the fork arms 113 to move longitudinally. Through the sliding cooperation between the double support arms 112 and the fork arms 113, the fork arms 113 can be telescopically moved to achieve precise longitudinal positioning of the goods for forking or unloading. This design enables non-positive access operations for goods in narrow passages, reducing the dependence on the straightness of the passage. The shelf spacing tolerance rate is increased by 40%, which is particularly suitable for the transformation scenario of special-shaped storage space. In addition, a crossbeam 115 is connected between the two support arms 112, and the two ends of the hydraulic cylinder 114 are respectively connected to the crossbeam 115 and the support frame 111. The setting of the crossbeam 115 enables the hydraulic connection mechanism to form a three-point stable support system, and the lateral offset of the fork arm 113 during longitudinal movement is controlled at ≤5mm compared with the traditional structure of 12 to 15mm, so that the retrieval accuracy of the 9-meter high shelf is improved to ±2cm, reducing the time consumption of the secondary adjustment operation by 50%.

[0041] In addition, the rotation drive device 16 includes a worm gear 161 provided on the rotating shaft 14, a worm 162 rotatably provided on the lifting frame 10 and meshing with the worm gear 161, and a hydraulic motor 163 that drives the worm gear 162 to rotate. The worm gear transmission mechanism realizes precise angle control and has a mechanical self-locking feature. In the case of a power outage, the current angle can still be maintained for ≥30 minutes, ensuring the safety of emergency braking.

[0042] Furthermore, the chassis 2 is provided with a recessed groove 18 for the lower part of the cockpit 6 to be embedded. The sunken cockpit 6 design lowers the center of gravity of the equipment. Combined with the buffer structure of the recessed groove 18, the lateral acceleration during high-speed steering is reduced, thereby improving the operator's physical comfort and reducing shelf collision accidents caused by equipment tilting.

[0043] In this embodiment, the counterweight device 17 includes a fixed counterweight block 171 and a movable counterweight assembly. The fixed counterweight block 171 is fixed to the rear end of the chassis 2, and the movable counterweight assembly is arranged on the fixed counterweight block 171 and reciprocates in the lateral direction. The laterally adjustable movable counterweight assembly reduces the center of mass offset of the equipment to 1 / 3 of the traditional structure through a dynamic balance compensation mechanism, thereby reducing the risk of rollover and allowing full-load steering operations to be completed in a 1.5m narrow lane. At the same time, the total amount of counterweight blocks is reduced by 15%. The movable counterweight assembly is arranged on the upper surface of the fixed counterweight block 171. The counterweight layout shortens the rear overhang length of the equipment by 0.8 to 1.2m, and the length of the entire vehicle is controlled within 2.1m, so that the U-turn radius at the end of the lane is reduced to 2.6m. The industry average is 3.5m, and the space utilization rate is increased by 17%.

[0044] At the same time, the movable counterweight assembly includes a transverse guide mechanism 173 distributed along the transverse direction, a counterweight block 174 arranged on the transverse guide mechanism 173, and a driving mechanism 175 connected to the counterweight block 174. The driving mechanism 175 is a linear driving mechanism, preferably a hydraulic cylinder, an air cylinder, or an electric push cylinder, preferably a hydraulic cylinder. The modular movable counterweight assembly supports online weight compensation and realizes dynamic adjustment of the load ratio by replacing counterweight blocks 174 of different specifications, so that the equipment can adapt to multiple scenarios from light cartons to heavy steel coils, thereby improving the reuse rate of equipment.

[0045] In this embodiment, the control system 1 includes a controller 101, a first pressure sensor 102 for detecting the weight of the cargo on the fork arm 113, a second pressure sensor 103 for detecting the weight of the counterweight 174, a first distance sensor 104 for detecting the distance between the cargo on the fork arm 113 and the rotation center of the rotating shaft 14, a second distance sensor 105 for detecting the distance between the counterweight 174 and the midpoint of the lateral guide mechanism 173, and an angle sensor 106 for detecting the rotation angle of the fork arm 113. The first pressure sensor 102, the second pressure sensor 103, the first distance sensor 104, the second distance sensor 105, and the angle sensor 106 are electrically connected to the input end of the controller 101, respectively. The multi-sensor closed-loop control system realizes real-time calculation of torque balance, can complete counterweight position adjustment in a short time, and reduces the risk of dynamic imbalance, especially during lateral access operations above 15°, and the stability coefficient K value is ≥2.5.

[0046] Furthermore, the control method of the control system 1 includes the following steps:

[0047] A. Predetermine the center of the transverse guide mechanism 173 and the distance of the transverse guide mechanism 173 , and input it into the controller 101;

[0048] B. When there is no cargo on the fork arm 113, the controller 101 controls the counterweight 174 to be located at the center of the transverse guide mechanism 173. Department;

[0049] C. When there is cargo on the fork arm 113, the controller 101 controls the first pressure sensor 102, the second pressure sensor 103, the first distance sensor 104, the second distance sensor 105, and the angle sensor 106 to obtain detection data in real time and transmit the detection data to the controller 101;

[0050] D. The controller 101 calculates the distance the counterweight 174 moves due to the rotation of the fork arm 113 using the following formula, thereby adjusting the position of the counterweight 174 in real time;

[0051] ;

[0052] in, is the distance the counterweight moves due to the rotation of the fork arm; is the weight of the fork arm cargo; is the weight of the counterweight; is the fork arm rotation angle; is the distance from the fork arm to the center of rotation;

[0053] E. When the fork arm 113 rotates, the controller 101 obtains the distance the counterweight 174 moves due to the rotation of the fork arm 113 The distance from the transverse guide mechanism 173 and compared, when When the fork arm 113 continues to rotate; when When the fork arm 113 stops rotating and a prompt is given to increase the weight of the counterweight 174.

[0054] The control method of this control system allows the maximum lateral operating angle to be expanded to more than 45° through intelligent control algorithms, and the adaptive adjustment reduces the energy consumption of counterweight movement by 40%. It prevents overload and rollover through preset safety thresholds, greatly reducing the accident rate.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0056] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0057] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0058] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A multifunctional multi-angle adjustable stacker, characterized by: The invention comprises a control system, a chassis, wheels, a power system, a steering system, a cockpit, a connecting frame, an outer door frame, an inner door frame, a lifting frame, a fork arm device, a first guide device, a second guide device, a rotating shaft, a lifting drive device, a rotating drive device and a counterweight device. The longitudinal direction extending along the length direction of the chassis is defined as the longitudinal direction, and the transverse direction extending along the width direction of the chassis is defined as the transverse direction. The wheels are arranged on the chassis, the power system is connected to the wheels for driving the chassis to move, the steering system is connected to the wheels for driving the chassis to turn, the outer door frame is arranged at the front end of the chassis, the first guide device is arranged on the outer door frame, the inner door frame is provided with a plurality of guide wheels, and the first guide device is provided on the outer door frame. The door frame is arranged on the first guide device, the second guide device is arranged on the inner door frame, the lifting frame is arranged on the second guide device, the lifting drive device is connected to the lifting frame and the inner door frame, and is used to drive the lifting and lowering movement of the lifting frame and the inner door frame, the fork arm device is arranged on the lifting frame through a rotating shaft, the rotary drive device is connected to the rotating shaft, and is used to drive the fork arm device to swing laterally, the cockpit is fixedly connected to the inner door frame through a connecting frame, the counterweight device is arranged at the rear end of the chassis, and the power system, steering system, fork arm device, lifting drive device, rotary drive device, and counterweight device are respectively electrically connected to the control system; The counterweight device includes a fixed counterweight block and a movable counterweight assembly, wherein the fixed counterweight block is fixedly mounted on the rear end of the chassis, and the movable counterweight assembly is mounted on the fixed counterweight block and reciprocates in the transverse direction. The movable counterweight assembly includes a transverse guide mechanism distributed in the transverse direction, a counterweight block mounted on the transverse guide mechanism, and a driving mechanism connected to the counterweight block. The fork arm device includes a support frame, two support arms with one end fixedly connected to the support frame and distributed in parallel, two fork arms respectively mounted on the support arms and sliding along the support arms, and a hydraulic cylinder driving the fork arms to move longitudinally, a crossbeam is connected between the two support arms, and the two ends of the hydraulic cylinder are respectively connected to the crossbeam and the support frame; The control system includes a controller, a first pressure sensor for detecting the weight of the cargo on the fork arm device, a second pressure sensor for detecting the weight of the counterweight, a first distance sensor for detecting the distance between the cargo on the fork arm device and the rotation center of the rotating shaft, a second distance sensor for detecting the distance between the counterweight and the midpoint of the transverse guide mechanism, and an angle sensor for detecting the rotation angle of the fork arm device, wherein the first pressure sensor, the second pressure sensor, the first distance sensor, the second distance sensor, and the angle sensor are electrically connected to the input terminal of the controller respectively; The control method of the control system includes the following steps: A. Predetermine the center of the lateral guide mechanism and the distance of the lateral guide mechanism and input it into the controller; B. When there is no cargo on the fork arm, the controller controls the counterweight to be located at the center of the transverse guide mechanism. Department; C. When there is cargo on the fork arm, the controller controls the first pressure sensor, the second pressure sensor, the first distance sensor, the second distance sensor, and the angle sensor to obtain detection data in real time and transmit the detection data to the controller; D. The controller calculates the distance the counterweight moves due to the rotation of the fork arm using the following formula, thereby adjusting the position of the counterweight in real time; ； in, is the distance the counterweight moves due to the rotation of the fork arm; is the weight of the fork arm cargo; is the weight of the counterweight; is the fork arm rotation angle; is the distance from the fork arm to the center of rotation; E. When the fork arm rotates, the controller obtains the distance the counterweight moves due to the fork arm rotation Distance from the lateral guide mechanism and compared, when When the fork arm continues to rotate; when When the fork arm rotates, it stops and prompts you to add the counterweight.

2. The multifunctional multi-angle adjustable stacker according to claim 1, characterized in that: The rotary drive device includes a worm wheel arranged on a rotating shaft, a worm rotatably arranged on a lifting frame and meshing with the worm wheel for transmission, and a hydraulic motor driving the worm wheel to rotate.

3. The multifunctional multi-angle adjustable stacker according to claim 1, characterized in that: The chassis is provided with a recessed groove for the lower part of the cockpit to be embedded.

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