Safety protection device for forklift cab

Abstract

The invention relates to the technical field of cab safety equipment, and discloses a safety protection device for a forklift cab, which comprises a protection mechanism mounted on the top or the front side window glass of the cab. The protection mechanism is provided with two rows of side edge supporting frames and a plurality of protection plates with the two ends rotationally connected, and the protection plates are parallel to the passenger bearing face. The protection mechanism is provided with an adjusting mechanism and a pushing mechanism, and the adjusting mechanism can adjust the inclination angle of the protection plates, so that visual extension lines of the protection plates intersect; the pushing mechanism pushes the adjusting mechanism to slide, and the intersection is made to adapt to visual starting points of passengers above driver seats of different heights. The array direction of the protection plates, the lifting direction of the driver seat and the sliding direction of the adjusting mechanism are parallel. The device is free of sight shielding and high in protection strength, has the functions of assisting climbing and shading, dust prevention and rain prevention, is high in adaptability and practicability, and can solve the problems that an existing device is prone to sight shielding and single in function and cannot meet multiple use requirements at the same time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cab safety equipment, in particular to a safety protection device for a forklift cab. BACKGROUND

[0002] As a general-purpose device widely used in logistics handling, warehousing operation and other scenes, the safety protection device of the forklift cab is a basic general-purpose component to protect the personal safety of the driver and passenger. It has been universally configured and used by various forklift products for a long time. The core function of this basic component is to resist the impact of external objects such as flying stones and debris during operation, to avoid damage to the passengers after the cab window glass is broken, and to ensure the observation of the surrounding environment during operation without being hindered. However, the safety protection device of the forklift cab in the prior art often has the problem of single function and insufficient practicability due to its structural design. The traditional protection device is mostly fixed with a metal grille or a single-layer protection plate structure. In order to ensure the protection strength, the grille spacing or the protection plate layout is usually dense, which causes the protection structure to easily block the line of sight when the driver and passenger observe during operation, especially in the scene where the height of the forklift driver's seat is adjustable. The line of sight blocking problem is more prominent for passengers of different heights or driver's seats of different lifting heights, which further affects the operation safety. On the other hand, the existing protection device can only realize the basic impact protection function and cannot meet the diversified needs during operation. For example, when operating outdoors, it lacks effective sunshade, dustproof and rainproof functions. When climbing to the top of the cab for equipment maintenance and other operations, the protection device cannot provide auxiliary support and needs to be assisted by climbing tools, which is cumbersome and has safety hazards. In addition, although some improved protection devices try to adjust the angle of the protection structure to improve the line of sight blocking problem, it is difficult to ensure that the visual extension lines of all protection components accurately adapt to the visual starting point of the passengers on the driver's seat of different heights after adjustment. There is still a situation of partial line of sight obstruction, and multiple functions such as protection strength, climbing assistance, sunshade and dustproof are not considered at the same time. Therefore, there is an urgent need for a forklift cab safety protection device with reasonable structure and comprehensive function. On the premise of ensuring the basic protection performance, it effectively solves the line of sight blocking problem and integrates multiple practical functions to meet the diversified use needs during forklift operation, improve the operation convenience and safety, which meets the general upgrading trend of the basic protection components of the forklift cab. SUMMARY

[0003] (I) Technical problems solved In view of the deficiencies of the prior art, the application provides a safety protection device for a forklift cab, which has the advantages of no visual obstruction, high protection strength, auxiliary climbing, sun-shading, dust-proofing and rain-proofing, and is suitable for different height driver seats, and has high practicability, and solves the problems of the prior art that the visual obstruction exists in the general protection device of the forklift cab, the function is single, and the protection, no visual obstruction, climbing assistance and sun-shading, dust-proofing and rain-proofing cannot be simultaneously satisfied.

[0004] (II) Technical solutions To achieve the above object, the application provides the following technical solutions. A safety protection device for a forklift cab, comprising a protection mechanism for being installed on a top or a front side of a window glass of a cab, the protection mechanism comprising two rows of side support frames and a plurality of protection plates rotatably arranged on the protection mechanism, each protection plate being parallel to a passenger bearing surface in the cab; the protection mechanism further comprising an adjusting mechanism and a pushing mechanism, the adjusting mechanism being used for adjusting an inclination angle of each protection plate, so that visual extension lines on each protection plate intersect at a point, and the pushing mechanism being used for pushing the adjusting mechanism to slide, so that the visual extension lines on each protection plate intersect at a visual starting point of a passenger above a different height driver seat; the array direction of each protection plate, the lifting adjusting direction of the driver seat in the cab and the sliding direction of the adjusting mechanism being parallel to each other.

[0005] Preferably, the adjusting mechanism comprises an adjusting plate, a plurality of rotating adjusting seats are rotatably arranged on the adjusting plate, each rotating adjusting seat is located on a visual extension line of a corresponding protection plate, each rotating adjusting seat is provided with an adjusting seat sliding groove, each protection plate is fixed with a lever at two ends, each lever passes through a corresponding adjusting seat sliding groove, and each lever slides in a corresponding adjusting seat sliding groove.

[0006] Preferably, the protection mechanism further comprises a support seat fixedly installed on the cab, each side support frame is provided with a sliding insertion plate at two ends, the sliding insertion plate is slidably installed in a corresponding support seat, the support seat is provided with a support spring, the support spring abuts against a bottom of the sliding insertion plate, so as to provide an elastic support force of the side support frame away from the cab, and the adjusting mechanism comprises at least two adjusting plates which slide relative to each other, and the rotating adjusting seats are arranged on a face away from each other between adjacent two adjusting plates, so as to avoid mutual interference between the two adjusting plates in the sliding process.

[0007] Preferably, each adjusting plate is respectively provided with a pushing mechanism, the pushing mechanism comprises a pusher and a pushing rod, one end of the pushing rod slides in the pusher, the other end of the pushing rod is fixedly installed on an extension plate, and each extension plate is fixedly installed on a corresponding adjusting plate.

[0008] Preferably, the side support frame is provided with rotating installation grooves at positions for rotatingly connecting the protective plates, each rotating installation groove is provided with a circular rotating groove at one end in the middle of the side support frame for rotatingly connecting the protective plates, and the other end of the rotating installation groove is inclined upward and opens at the edge of the side support frame for dismounting the protective plates.

[0009] Preferably, the two surfaces of the protective plate are parallel to each other, the visual extension lines on the protective plate are located on the symmetrical reference surface of the two surfaces of the protective plate, and all the visual extension lines are located on the same vertical surface which is perpendicular to each protective plate.

[0010] Preferably, a spring is arranged at the sliding connection between two adjacent adjusting plates, the spring is parallel to the sliding direction of the adjusting plates, and the two ends of the spring are fixed on the two adjusting plates respectively.

[0011] Preferably, the cab is provided with protective mechanisms at the top and the front side respectively, and a connecting baffle is arranged at the corner between the two protective mechanisms.

[0012] Preferably, the support seat is further provided with a support limiting block for limiting the limit distance of the movement of the side support frame to the cab.

[0013] Preferably, the adjusting mechanism is provided with a locking structure, the locking structure comprises a locking pin and a locking hole, a plurality of locking holes are arranged on the cab frame along the sliding direction of the adjusting mechanism, the locking pin is inserted into different locking holes to realize the locking of the adjusting mechanism at the corresponding position, and the locking pin is arranged on the adjusting plate and slides along the direction perpendicular to the sliding direction of the adjusting mechanism, so that the adjusting mechanism is fixed by inserting the locking pin into the locking hole.

[0014] (Three) beneficial effects Compared with the prior art, the safety protection device for the forklift cab has the following beneficial effects: 1. The safety protection device for the forklift cab is provided with the protective plates parallel to the occupant bearing surface in the cab, the visual extension lines on all the protective plates intersect at the visual starting point of the occupant when working, so that the occupant will not be blocked by the protective plates no matter which direction he looks, the vertically erected protective plates can improve the protection ability and are not easy to bend when impacted, the locking structure is arranged to fix the adjusting mechanism, the horizontally placed protective plates can be used as temporary ladders for climbing to the top of the cab for work, and the adjusting mechanism is controlled to slide to make all the protective plates rotate and deviate from the original visual extension lines to achieve the effects of sun-shading, dust-proofing and rain-proofing; the structure simultaneously realizes the multiple effects of not blocking the view, being used for climbing, sun-shading, dust-proofing and rain-proofing.

[0015] 2. The safety protection device for the driver's cab of the forklift truck, by setting the supporting spring in the supporting seat, the elastic support is provided for the side support frame, and by setting the multiple sections of the adjusting plates which slide with each other in an adjusting mechanism, when the impact is received by somewhere of the protection plates, all the protection plates slide downward or obliquely downward with the side support frame, at this time, the elastic support is provided by the supporting spring, and at the same time, the adjusting plates slide by the pushing of the push rods which slide downward with the protection plates, so as to change the inclination angle of the protection plates, to avoid the small fragments splashing into the driver's cab after the first impact, that is, by receiving the first impact by the vertical protection plates, the inclination angle of the protection plates is automatically switched, to shield the small splashing objects, and by setting the multiple sections of the adjusting plates, the jamming of one section of the adjusting plates caused by the deformation of the protection plate receiving the impact is prevented, to improve the failure prevention rate.

[0016] 3. The safety protection device for the driver's cab of the forklift truck, by setting the multiple sections of the adjusting plates, and by providing the pushing mechanism for the multiple sections of the adjusting plates, when the angle of the protection plates is adjusted, the position of one section of the adjusting plates can be adjusted individually, so as to control the inclination angle of the protection plates in different areas, for example, when the passengers do not need to observe the obliquely upward direction and the sunlight is relatively strong, the protection plates close to the upper side can be closed individually, to achieve the effect of local sunshade, and the multiple sections of the adjusting plates can avoid the multiple push rods with the angle difference being too large connected to one section of the adjusting plates, to reduce the jamming rate of the same section of the adjusting plates during the adjustment and when the impact is received.

[0017] 4. The safety protection device for the driver's cab of the forklift truck, by setting the rotating installation groove, the protection plates are conveniently installed on the side support frame in the rotating connection, and the protection plates can be disassembled in the emergency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structural schematic view of the driver's cab of the application.

[0019] Figure 2 It is the side view of the driver's cab of the application.

[0020] Figure 3 It is the line structure view of the visual starting point and the visual extension line of the passengers of the application.

[0021] Figure 4 It is the structural schematic view of the protection mechanism of the application.

[0022] Figure 5 It is the structural schematic view of the protection mechanism, the adjusting mechanism and the pushing mechanism of the application.

[0023] Figure 6 It is the structural schematic view of the side support frame of the application.

[0024] Figure 7 It is the structural schematic view of the adjusting plate of the application.

[0025] Figure 8 Structure diagram of the adjusting mechanism and the pushing mechanism of the present application.

[0026] Figure 9 Structure diagram of the protection plate of the present application.

[0027] Figure 10 Structure diagram of the supporting seat of the present application.

[0028] In the figure: 1, driver's cabin; 11, window glass; 12, occupant visual origin; 13, visual extension line; 2, protection mechanism; 21, side support frame; 22, protection plate; 23, supporting seat; 211, sliding plugboard; 212, rotating installation slot; 221, lever; 231, supporting spring; 232, supporting limit block; 3, adjusting mechanism; 31, adjusting plate; 311, extension plate; 32, rotating adjusting seat; 321, adjusting seat sliding slot; 33, sliding supporting seat; 4, pushing mechanism; 41, pusher; 42, pushing rod; 5, connecting baffle. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0030] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0031] In addition, fixed connection refers to the connection of parts or components after being fixed without any relative movement; transmission connection refers to a connection mode of transmitting mechanical movement or torque to other working components through transmission parts; sliding connection refers to a connection mode in which two objects are in contact but not fixed, and can slide relative to each other; rotating connection refers to a connection mode in which two objects are in contact but not fixed, and can rotate relative to each other.

[0032] Furthermore, the terms "first", "second", "third", etc. are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or an ordered sequence. Thus, features referring to "first", "second" etc. can include, explicitly or implicitly, one or more of such features. In the description of the application, the meaning of "a plurality" is two or more, unless explicitly specified otherwise.

[0033] Embodiment one: The embodiment provides a safety protection device for a forklift cab, which has the following technical features.

[0034] Please refer to Figures 1-10 A safety protection device for a forklift cab, comprising a protection mechanism 2 for being installed on a window glass 11 on the top or front side of a cab 1, The protection mechanism 2 comprises two rows of side support frames 21 and a plurality of protection plates 22 rotatably arranged at both ends of the protection mechanism 2, and each protection plate 22 is parallel to a passenger bearing surface in the cab 1. The protection mechanism 2 is further provided with an adjusting mechanism 3 and a pushing mechanism 4, the adjusting mechanism 3 is used for adjusting the inclination angle of each protection plate 22, so that the visual extension line 13 on each protection plate 22 converges at a point, and the pushing mechanism 4 is used for sliding the adjusting mechanism 3, so that the visual extension line 13 on each protection plate 22 converges at a passenger visual starting point above the driver's seat at different heights. The array direction of each protection plate 22, the lifting adjusting direction of the driver's seat in the cab 1 and the sliding direction of the adjusting mechanism 3 are parallel to each other.

[0035] Further, the adjusting mechanism 3 further comprises a sliding support seat 33, the bottom of the sliding support seat 33 is fixedly installed on the frame of the cab 1 through bolts, and the top of the sliding support seat 33 is provided with a sliding groove, and the bottom of the adjusting plate 31 slides in the clamping groove in the sliding support seat 33.

[0036] It should be noted that the two faces of the protection plate 22 are parallel to each other, the visual extension line 13 on the protection plate 22 is located on the symmetric reference plane of the two faces of the protection plate 22, and all the visual extension lines 13 are located on the same vertical plane, which is perpendicular to each protection plate 22.

[0037] It should be noted that the passenger visual starting point 12 in the cab 1 refers to the eyes of the passenger, and the height position of the passenger visual starting point 12 is changed by adjusting the height of the seat of the cab.

[0038] It should be noted that the passenger bearing surface in the cab 1 refers to the core support plane specially used for bearing the passenger and related devices, and in essence, it is to make the protection plate 22 in the visual angle of the driver during driving in a horizontal state.

[0039] In an alternative embodiment, the adjusting mechanism 3 comprises an adjusting plate 31, a plurality of rotating adjusting seats 32 are arranged on the adjusting plate 31, each rotating adjusting seat 32 is located on the visual extension line 13 of the corresponding guard plate 22, and each rotating adjusting seat 32 is provided with an adjusting seat sliding groove 321, each guard plate 22 is fixed with a push rod 221 at both ends, each push rod 221 passes through the corresponding adjusting seat sliding groove 321, and each push rod 221 is slidably attached to the corresponding adjusting seat sliding groove 321.

[0040] In an alternative embodiment, the guard mechanism 2 further comprises a support seat 23 fixedly installed on the cab 1, and each side support frame 21 is provided with a sliding insertion plate 211 at both ends, the sliding insertion plate 211 is slidably installed in the corresponding support seat 23, the support seat 23 is provided with a support spring 231, the support spring 231 abuts against the bottom of the sliding insertion plate 211, so as to provide the side support frame 21 with an elastic support force away from the cab 1. The adjusting mechanism 3 comprises at least two adjusting plates 31 that slide relative to each other, and rotating adjusting seats 32 are arranged on the sides away from each other of adjacent two adjusting plates 31, so as to avoid mutual interference of the two adjusting plates 31 during sliding.

[0041] It should be noted that, since at least two adjusting plates 31 that slide relative to each other are arranged, the pushing mechanism 4 can push the plurality of adjusting plates 31 simultaneously by the following two methods: 1. A spring is arranged at the sliding connection between two adjacent adjusting plates 31, the spring is parallel to the sliding direction of the adjusting plate 31, and the two ends of the spring are fixed on the two adjusting plates 31, respectively; 2. The pushing mechanism 4 is arranged for each adjusting plate 31, and the pushing mechanisms 4 are connected and controlled together, so as to push different adjusting plates 31 simultaneously.

[0042] It should be noted that the sliding connection mode of the adjacent two adjusting plates 31 is that a T-shaped sliding groove and a T-shaped sliding block are arranged on the two adjusting plates 31, respectively, and a detachable limiting protrusion is arranged in the sliding groove, so as to limit the sliding distance of the adjusting plates 31 relative to each other.

[0043] In an alternative embodiment, the pushing mechanism 4 is arranged on each adjusting plate 31, the pushing mechanism 4 comprises a pusher 41 and a push rod 42, one end of the push rod 42 slides in the pusher 41, the other end of the push rod 42 is fixedly installed on an extension plate 311, and each extension plate 311 is fixedly installed on the corresponding adjusting plate 31.

[0044] It should be noted that the type of the pusher 41 includes a linear motor, a servo motor, or other motor structures, or a hydraulic cylinder, an air cylinder, or other pressure pushing structures.

[0045] It should be noted that when a plurality of pushing mechanisms 4 are arranged in a protection mechanism 2, the controllers of the pushers 41 in each pushing mechanism 4 are electrically connected to a general controller.

[0046] In an alternative embodiment, the side support frame 21 is correspondingly provided with a rotating installation groove 212 at a position for rotatingly connecting the protection plate 22, each rotating installation groove 212 is provided with a circular rotating groove at one end in the middle of the side support frame 21 for rotatingly connecting the protection plate 22, and the other end of the rotating installation groove 212 is obliquely upwardly arranged and opened at the edge of the side support frame 21 for dismounting the protection plate 22.

[0047] In an alternative embodiment, the two faces of the protection plate 22 are parallel to each other, the visual extension line 13 on the protection plate 22 is located on the symmetrical reference plane of the two faces of the protection plate 22, and all the visual extension lines 13 are located on the same vertical plane which is perpendicular to each protection plate 22.

[0048] In an alternative embodiment, a spring is arranged at the sliding connection between two adjacent adjustment plates 31, the spring is parallel to the sliding direction of the adjustment plates 31, and the two ends of the spring are respectively fixed on the two adjustment plates 31.

[0049] In an alternative embodiment, the cab 1 is provided with a protection mechanism 2 at the top and the front side respectively, and a connecting baffle 5 is arranged at the corner between the two protection mechanisms 2.

[0050] Further, the connecting baffle 5 is detachably installed at the corner between the two protection mechanisms 2, the edge of the connecting baffle 5 is attached to the side support frame 21 of the two protection mechanisms 2 for closing the gap between the corners.

[0051] In an alternative embodiment, the support seat 23 is further provided with a support limiting block 232 for limiting the limit distance of the movement of the side support frame 21 towards the cab 1.

[0052] In an alternative embodiment, the adjustment mechanism 3 is provided with a locking structure, the locking structure includes a locking pin and a locking hole, a plurality of locking holes are arranged on the frame of the cab 1 along the sliding direction of the adjustment mechanism 3, the locking pin is inserted into different locking holes to achieve the locking of the adjustment mechanism 3 at the corresponding position, and the locking pin is slidingly arranged on the adjustment plate 31 in a direction perpendicular to the sliding direction of the adjustment mechanism 3, and the adjustment mechanism 3 is fixed by inserting the locking pin into the locking hole.

[0053] Further, the protection plate 22 is a parallel plate structure, the visual extension line 13 thereof is located on the symmetrical reference plane perpendicular to the plate face, and all the visual extension lines 13 are coplanar and the coplanar plane is a vertical plane.

[0054] Further, the other end of the rotating installation groove 212 is inclined upward at an angle of 30°-60°, and an opening is formed at the outer edge of the side support frame 21, so that the push rod 221 of the protective plate 22 can be pulled out from the opening in the inclined direction during disassembly.

[0055] Further, each extension plate 311 is vertically fixed to the end or a position close to the end of the corresponding adjustment plate 31, and the extension direction of the extension plate 311 is perpendicular to the sliding direction of the adjustment plate 31.

[0056] Further, the protective plate 22 is made of stainless steel, the thickness of the protective plate 22 is 5-12mm, the distance between adjacent two protective plates 22 is 30-80mm, and the edge of the protective plate 22 is provided with a round corner transition structure.

[0057] Further, the total controller of the pushing mechanism 4 is electrically connected with the driver seat lifting control system of the cab 1, and when the driver seat is lifted, the total controller synchronously drives the pushing mechanism 4 to adjust the sliding position of the adjustment plate 31, so that the visual extension line 13 automatically intersects at the current passenger visual starting point 12.

[0058] Further, the locking pin of the locking structure is driven by electromagnetic drive or manual push rod, the fitting gap between the locking pin and the lock hole is not greater than 0.5mm, and when the adjustment mechanism 3 slides, the locking pin automatically disengages from the lock hole; after the adjustment mechanism 3 stops sliding, the locking pin automatically inserts into the corresponding lock hole under the action of the reset spring.

[0059] Further, the inner side wall of the support seat 23 is provided with a guide sliding rail, the two sides of the sliding plug plate 211 are provided with a guide groove matched with the guide sliding rail, a wear-resistant bushing is arranged in the guide groove, and the wear-resistant bushing is made of polytetrafluoroethylene material.

[0060] Further, the opening of the rotating installation groove 212 is provided with an elastic clamping block made of rubber material, and after the protective plate 22 is installed in place, the elastic clamping block abuts against the edge of the protective plate 22 to prevent abnormal noise during driving.

[0061] Further, a sealing rubber strip is arranged at the connection between the abutment baffle 5 and the two protective mechanisms 2, the material of the abutment baffle 5 is consistent with that of the protective plate 22, and the visual extension line of the abutment baffle 5 is coplanar with the visual extension line 13 of the adjacent protective mechanism 2.

[0062] Further, in one protective mechanism 2, the distance between the rotation centers of all adjacent two protective plates 22 is the same, the distance between the rotation centers of all adjacent two rotating adjustment seats 32 is the same, and the distance between the rotation centers of the adjacent two protective plates 22 is greater than the distance between the rotation centers of the adjacent two rotating adjustment seats 32.

[0063] Supplementary explanation: Supplement to the principle of visual extension line intersection: the occupant bearing surface is the hip support plane when the driver is in a sitting position, and the protection plate is initially parallel to the plane, at which time the visual extension line is horizontal; when the adjusting mechanism pushes the adjusting plate to slide, the sliding groove of the rotating adjusting seat drives the protection plate to tilt around the rotation center of the side support frame through the lever, and since all the visual extension lines are coplanar (vertical plane) and perpendicular to the protection plate, the tilted visual extension lines will converge at a point (the starting point of the occupant's vision) in the vertical plane. When designing, the initial angle of the protection plate needs to ensure that there is no obstruction or small area obstruction in the field of view in the horizontal state, and the adjustment range needs to cover the visual starting point height corresponding to drivers of different heights (the seat lifting range is usually 100-300 mm). Linkage logic of multi-section adjusting plate: the multi-section adjusting plate uses a T-shaped sliding groove connected with a sliding block, and a limiting protrusion is installed at both ends of the sliding groove, and the distance between them is the maximum sliding stroke, which needs to meet the requirement that when the adjusting plate slides, the inclination angle of the protection plate can make the visual extension line cover the full range of seat lifting; the rotating adjusting seats of adjacent adjusting plates are arranged on the opposite sides away from each other, and the line connecting the rotation centers of the adjusting seats and the protection plate is parallel to the sliding direction of the adjusting plate, so as to avoid interference between the adjusting seat and the protection plate or the lever when sliding.

[0064] Optimized synchronous pushing mechanism: centralized control is adopted by using a total controller and a servo motor pusher, and each adjusting plate is configured with an independent servo motor, the position of the adjusting plate is fed back through an encoder, the total controller calculates the target position of each adjusting plate according to the seat height signal (real-time transmission by the seat lifting control system), high-precision synchronous adjustment is realized, and the elastic deformation error of the spring synchronization is avoided.

[0065] Perfect linkage design of locking structure: an electromagnetic lock pin is used, and the lock pin is linked with the sliding mechanism of the adjusting plate; when the pushing mechanism receives the adjustment signal, the total controller synchronously powers on the electromagnetic lock pin, the lock pin compresses the return spring to disengage from the lock hole; after the adjusting plate is in place, the pushing mechanism stops, the signal triggers the electromagnetic lock pin to be powered off, the lock pin is inserted into the corresponding lock hole under the action of the return spring, and the lock pin and the lock hole adopt taper surface cooperation to improve the locking stability. Increase state monitoring and emergency function: travel switches are installed at both ends of the sliding track of the adjusting plate to real-time feedback whether the adjusting plate is in place; a manual adjustment button is arranged in the cab, which can control the pushing mechanism manually or directly adjust the position of the adjusting plate when the electrical system fails; an angle sensor is installed at the connection between the protection plate and the side support frame to real-time monitor the inclination angle of the protection plate, and the total controller alarms when an abnormality occurs.

[0066] Supplementary dimensional parameters for the protective plate and adjustment mechanism: The width of the protective plate must match the width of the cab window; the spacing between adjacent protective plates should be 30-80mm, and should be designed according to the size of foreign objects in the forklift's operating environment (to prevent foreign objects with a diameter greater than 20mm from entering); the length of the sliding groove of the rotating adjustment seat should be 50-80mm, and the width of the sliding groove should be 0.5-1mm larger than the diameter of the lever to ensure smooth sliding of the lever.

[0067] Parameter design of the elastic support structure: The support spring 231 adopts a cylindrical helical compression spring with an elastic coefficient of 5-10 N / mm and a compression stroke of 20-30 mm. The installation position of the support limit block 232 must ensure that the maximum compression of the side support frame does not exceed the allowable compression of the spring. The clearance between the guide rail on the inner side wall of the support base and the guide groove of the sliding plate is 0.1-0.3 mm. The thickness of the polytetrafluoroethylene wear-resistant bushing is 2-3 mm to reduce the coefficient of sliding friction.

[0068] Working principle: such as Figure 3 As shown, points b1 and b2 refer to the positions of the occupant's visual starting point 12 before and after movement, points a1 and a2 refer to the rotation center positions of the two protective plates 22, points c1 and d1 refer to the rotation center positions of the two rotation adjustment seats 32 before movement, and points c2 and d2 refer to the rotation center positions of the two rotation adjustment seats 32 after movement. The line connecting b1a1 and b1a2 represents the position of the two visual extension lines 13 before movement, and the line connecting b2a1 and b2a2 represents the position of the two visual extension lines 13 after movement. Since the array direction of each protective plate 22, the lifting and lowering adjustment direction of the driver's seat in the cab 1, and the sliding direction of the adjustment mechanism 3 are parallel to each other, it can be known that b1b2, c1c2, and a1a2 are parallel to each other, and c1c2 and d1d2 are collinear. According to the aforementioned conditions, the length of c1c2 is equal to the length of d1d2, which means that the position of the occupant's visual starting point 12 can be controlled by controlling the sliding of the adjustment mechanism 3.

[0069] In summary, the safety protection device for the forklift cab, by setting up protective plates 22 parallel to the occupant bearing surface inside the cab 1, ensures that during operation, the visual extension lines 13 on all protective plates 22 converge at the occupant's visual starting point 12. This prevents the occupant from having their view obstructed by the protective plates 22, regardless of which direction they are looking. Furthermore, the upright protective plates 22 enhance their protective capabilities, making them less prone to bending upon impact. Additionally, by setting up a locking structure to fix the adjustment mechanism 3, the horizontally placed protective plates 22 can also be used as temporary climbing steps, facilitating workers' access to the top of the cab for work. During rest periods, controlling the adjustment mechanism 3 to slide allows all protective plates 22 to rotate, deviating from their original visual extension lines, thus providing sunshade, dust protection, and rain protection. This structure simultaneously achieves multiple benefits: unobstructed vision, usability for climbing, sunshade, dust protection, and rain protection.

[0070] The safety protection device for the forklift cab provides elastic support for the side support frame 21 by arranging the support spring 231 in the support seat 23, and provides multiple segments of mutually sliding adjustment plates 31 in an adjustment mechanism 3, when some of the protection plates 22 are impacted, all the protection plates 22 slide downward or obliquely downward along with the side support frame 21, at this time the support spring 231 provides elastic support, and at the same time, because the protection plates 22 slide downward along with the push rod 221, the push rod 221 pushes the adjustment plate 31 to slide, thereby changing the inclination angle of the protection plate 22, avoiding that after the first impact, small fragments splash into the cab, that is, by vertically standing the protection plate 22 to accept the first impact, and then automatically switching the inclination angle of the protection plate 22 to shield small splashes, and by arranging multiple segments of the adjustment plate 31, the protection plate 22 that is impacted is prevented from being deformed to cause one segment of the adjustment plate 31 to be stuck, thereby improving the failure prevention rate.

[0071] The safety protection device for the forklift cab, by arranging multiple segments of the adjustment plate 31 and providing a pushing mechanism 4 for the multiple segments of the adjustment plate 31, when adjusting the angle of the protection plate 22, the position of one segment of the adjustment plate 31 can be adjusted alone, thereby controlling the inclination angle of the protection plate 22 in different areas, for example, when the passenger does not need to observe obliquely upward and the sunlight is relatively glaring, the protection plate 22 close to the upper side can be closed alone, thereby achieving the effect of local sunshade, and the multiple segments of the adjustment plate 31 can avoid connecting multiple push rods 221 with too large angle difference in the same segment of the adjustment plate 31, thereby reducing the sticking rate when adjusting and being impacted.

[0072] The safety protection device for the forklift cab, by arranging the rotating installation groove 212, the protection plate 22 can be conveniently installed on the side support frame 21 in a rotating connection, and the protection plate 22 can also be disassembled in an emergency.

[0073] It should be noted that in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0074] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A safety protection device for a forklift cab, comprising a protection mechanism (2) for mounting on the roof or front side of a cab (1) window glass (11), characterized in that: the protection mechanism (2) comprises two rows of side support frames (21) and a plurality of protection plates (22) rotatably arranged at both ends of the protection mechanism (2), each protection plate (22) being parallel to the occupant bearing surface in the cab (1); the protection mechanism (2) is further provided with an adjusting mechanism (3) and a pushing mechanism (4), the adjusting mechanism (3) being used to adjust the inclination angle of each protection plate (22) so that the visual extension lines (13) on each protection plate (22) intersect at one point, and the pushing mechanism (4) being used to push the adjusting mechanism (3) to slide so that the visual extension lines (13) on each protection plate (22) intersect above the occupant visual starting point at different heights of the driver seat; the array direction of each protection plate (22), the lifting adjustment direction of the driver seat in the cab (1), and the sliding direction of the adjusting mechanism (3) are parallel to each other.

2. The safety guard for a forklift operator's compartment according to claim 1, wherein the adjusting mechanism (3) comprises an adjusting plate (31), a plurality of rotating adjusting seats (32) are rotatably arranged on the adjusting plate (31), the rotation center of each rotating adjusting seat (32) is located on the visual extension line (13) of the corresponding protection plate (22), each rotating adjusting seat (32) is provided with an adjusting seat sliding groove (321), each protection plate (22) is fixedly provided with a lever (221) at both ends, each lever (221) passes through the corresponding adjusting seat sliding groove (321), and each lever (221) slides in the corresponding adjusting seat sliding groove (321).

3. The safety guard for a forklift operator's compartment according to claim 2, wherein the protection mechanism (2) further comprises a support seat (23) fixedly installed on the cab (1), each side support frame (21) is provided with a sliding insertion plate (211) at both ends, the sliding insertion plate (211) is slidably installed in the corresponding support seat (23), the support seat (23) is provided with a support spring (231), and the support spring (231) abuts against the bottom of the sliding insertion plate (211), so as to provide the side support frame (21) with elastic support force away from the cab (1); the adjusting mechanism (3) comprises at least two sections of adjusting plates (31) that slide relative to each other, and the rotating adjusting seats (32) are arranged on one side of the adjacent two sections of adjusting plates (31) along the sliding direction.

4. The safety guard for a forklift operator's compartment according to claim 3, wherein each adjusting plate (31) is respectively provided with a pushing mechanism (4), the pushing mechanism (4) comprises a pusher (41) and a pushing rod (42), one end of the pushing rod (42) slides in the pusher (41), the other end of the pushing rod (42) is fixedly installed on an extension plate (311), and each extension plate (311) is fixedly installed on the corresponding adjusting plate (31).

5. A safety guard for a forklift cab according to claim 4, wherein The side support frame (21) is provided with a rotating installation groove (212) at a position for rotatingly connecting the protection plate (22), each rotating installation groove (212) is provided with a circular rotating groove at one end in the middle of the side support frame (21) for rotatingly connecting the protection plate (22), and the other end of the rotating installation groove (212) is inclined upward and is opened at the edge of the side support frame (21) for dismounting the protection plate (22).

6. The safety shield for a forklift operator's compartment of claim 1, wherein, The two surfaces of the protection plate (22) are parallel to each other, the visual extension line (13) on the protection plate (22) is located on the symmetric reference surface of the two surfaces of the protection plate (22), all the visual extension lines (13) are located on the same vertical surface, and the vertical surface is perpendicular to each protection plate (22).

7. The safety shield for a forklift operator's compartment of claim 3, wherein: A spring is arranged at the sliding connection of two adjacent adjusting plates (31), the spring is parallel to the sliding direction of the adjusting plate (31), and the two ends of the spring are fixed on the two adjusting plates (31) respectively.

8. The safety shield for a forklift operator's compartment of claim 3, wherein, The cab (1) is provided with a protection mechanism (2) at the top and the front side respectively, and a connecting baffle (5) is arranged at the corner between the two protection mechanisms (2).

9. The safety shield for a forklift operator's compartment of claim 3, wherein, The support seat (23) is further provided with a support limiting block (232) for limiting the limit distance of the movement of the side support frame (21) to the cab (1).

10. The safety shield for a forklift operator's compartment of claim 3, wherein, The adjusting mechanism (3) is provided with a locking structure, the locking structure comprises a locking pin and a locking hole, a plurality of locking holes are arranged on the frame of the cab (1) along the sliding direction of the adjusting mechanism (3), the locking pin is inserted into different locking holes to realize the locking of the adjusting mechanism (3) at the corresponding position, the locking pin is arranged on the adjusting plate (31) and slides along the direction perpendicular to the sliding direction of the adjusting mechanism (3), and the adjusting mechanism (3) is fixed by inserting the locking pin into the locking hole.

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