Forward-moving type forklift with portal frame

Abstract

The invention provides a portal forward-moving type forklift. The portal forward-moving type forklift is characterized in that racks are arranged on the opposite inner side faces of a left support and a right support correspondingly; a push-pull block and a gear are arranged on the left and right sides of the portal respectively; the left supporting leg and the right supporting leg can move up and down between a first vertical position and a second vertical position relative to the left support and the right support respectively. The push-pull rod moves back and forth between a first translation position and a second translation position relative to the left bracket and the right bracket respectively; the front end of the push-pull rod at the first translation position is not in contact with the left supporting leg and the right supporting leg; when the push-pull block pushes the push-pull rod to move forwards together to a second translation position, the front end of the push-pull rod applies downward pressure to the left supporting leg and the right supporting leg, so that the left supporting leg and the right supporting leg move downwards to a second vertical position, and the push-pull rod moving to the second translation position is disconnected from the push-pull block; therefore, the push-pull block can continuously move forwards. According to the forklift provided by the invention, the gravity center of the forklift can move backwards, and the forklift is easy to maintain.

Description

Technical Field

[0001] The invention relates to the field of handling equipment, and in particular to a portal-moving forklift. Background Art

[0002] With the rapid development of my country's manufacturing and logistics industries, storage in automated warehouses has become a basic need in all walks of life. Reach forklifts are becoming more and more widely used due to their environmental protection and energy saving, low noise, high lifting, and small working space, especially AGV forklifts.

[0003] In the process of implementing the present invention, the inventors found that there are at least the following problems in the prior art:

[0004] At present, the center of gravity of the chassis structure of the reach truck can only be adjusted by adding counterweight or lengthening the length of the vehicle body to balance the center of gravity and stabilize the vehicle body. In addition, the movement of the mast of the reach truck is currently mostly done by hydraulic cylinders, which has problems such as hydraulic oil leakage and inconvenient maintenance.

[0005] Therefore, a portal frame reach-type forklift is needed to at least partially solve the above technical problems. Summary of the invention

[0006] The embodiment of the present invention provides a forklift with a forward-moving mast, which enables the center of gravity of the forklift to move backward and is easy to maintain.

[0007] The present invention provides a mast-forward forklift, the forklift comprising a base frame and a mast;

[0008] The base frame comprises a left bracket, a right bracket and a connecting frame with two ends respectively connected to the left bracket and the right bracket; the left bracket and the right bracket are respectively provided with racks along the front-back direction on the opposite inner sides;

[0009] The door frame is arranged between the left bracket and the right bracket and can move in the front-rear direction relative to the left bracket and the right bracket; the door frame is provided with a push-pull block and a gear under the push-pull block on the left and right sides respectively, and the two gears on both sides of the door frame can rotate synchronously and mesh with the racks on the corresponding sides;

[0010] A left leg and a right leg respectively disposed on the left bracket and the right bracket at positions in front of the respective driving wheels, the left leg and the right leg being configured to be movable up and down between a first vertical position and a second vertical position relative to the left bracket and the right bracket, respectively; and

[0011] Push-pull rods are respectively arranged inside the left bracket and the right bracket along the front-rear direction, and the push-pull rods are configured to be movably connected to the push-pull block between a first translation position and a second translation position relative to the left bracket and the right bracket, and to move forward and backward synchronously under the push-pull force applied by the push-pull block in forward and backward movement;

[0012] Among them, the front end of the push-pull rod located at the first translation position does not contact the left leg and the right leg, so that the left leg and the right leg are located in the first vertical position; when the push-pull block pushes the push-pull rod to move forward to the second translation position, the front end of the push-pull rod applies downward pressure to the left leg and the right leg, so that the left leg and the right leg move downward to the second vertical position, and the push-pull rod moved to the second translation position can be disconnected from the push-pull block to enable the push-pull block to continue to move forward, and the front end of the push-pull rod keeps pressing down the left leg and the right leg, so that the left leg and the right leg remain in the second vertical position.

[0013] According to the portal frame forward moving forklift of the present invention, the left leg and the right leg are respectively arranged in front of the driving wheels of the left bracket and the right bracket, and the left leg and the right leg can move up and down under the joint action of the push-pull block and the push-pull rod on the corresponding side. When the push-pull block pushes the push-pull rod to move forward to the second translation position, the left leg and the right leg can move downward to the second vertical position, so that the left leg and the right leg can be supported on the ground or other work surfaces, which is equivalent to adding a support point in the front position of the forklift, realizing the backward shift of the center of gravity of the forklift and enhancing the stability of the forklift during operation. The push-pull rod moved to the second translation position can be disconnected from the push-pull block, so that the push-pull block can continue to move forward, that is, it does not affect the normal forward movement of the portal frame. In addition, compared with the existing hydraulic transmission method, the portal frame adopts a gear and rack transmission method, which is easy to maintain and has higher transmission efficiency.

[0014] By utilizing the technical solution according to the embodiment of the present invention, the beneficial effects that can be obtained are at least:

[0015] 1. According to the forklift of the present invention, the front positions of the running wheels of the left bracket and the right bracket are respectively provided with legs that can move up and down, so that the two legs can be supported on the ground or other work surfaces, which is equivalent to adding two support points in the front position of the forklift, realizing the rearward shift of the center of gravity of the forklift, and enhancing the stability of the forklift during operation;

[0016] 2. According to the forklift of the present invention, the mast is driven by gears and racks to achieve forward and backward movement, which has higher movement efficiency and is also convenient for maintenance;

[0017] 3. According to the forklift of the present invention, when the forklift is traveling on a road with changing terrain conditions, the two rear universal wheels under the connecting frame of the chassis can adaptively adjust the up and down positions along with the bridge frame plate according to the terrain changes, so that the driving wheels can maintain contact with the road surface and avoid the driving wheels being suspended.

[0018] Additional advantages, purposes, and features of the present invention will be described in part in the following description, and will become apparent to those skilled in the art after studying the following, or may be learned from the practice of the present invention. The purposes and other advantages of the present invention may be achieved and obtained by the structures specifically indicated in the specification and the accompanying drawings.

[0019] Those skilled in the art will appreciate that the objectives and advantages that can be achieved with the present invention are not limited to the above specific description, and the above and other objectives that can be achieved by the present invention will be more clearly understood from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention. The components in the drawings are not drawn to scale, but are only for illustrating the principles of the present invention. In order to facilitate the illustration and description of some parts of the present invention, the corresponding parts in the drawings may be enlarged, that is, they may become larger relative to other components in the exemplary device actually manufactured according to the present invention. In the drawings:

[0021] Figure 1 It is a schematic diagram of installing a push-pull block and a gear on a door frame in a forklift according to an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of a driving mechanism for realizing synchronous rotation of gears in a forklift according to an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of a chassis in a forklift according to an embodiment of the present invention;

[0024] Figure 4 for Figure 3 A schematic diagram of the bottom view of the chassis structure shown;

[0025] Figure 5 A schematic diagram of a connection between a push-pull rod, a left leg and a push-pull block in a forklift according to an embodiment of the present invention;

[0026] Figure 6 Schematic diagram of the relative position between the left leg or the right leg and the guide plate in a forklift according to an embodiment of the present invention; wherein: Figure 6 (a) is a side view schematic diagram, Figure 6 (b) is Figure 6The cross-sectional view shown by line AA in (a);

[0027] Figure 7 is a schematic diagram of a leg slider in a forklift according to an embodiment of the present invention;

[0028] Figure 8 is a schematic diagram of a push-pull block in a forklift according to an embodiment of the present invention;

[0029] Fig. 9 is a schematic diagram of a push-pull slider in a forklift according to an embodiment of the present invention;

[0030] Fig.10 A schematic diagram of a connection between a push-pull block, a latch, a push-pull slider and a guide block in a forklift according to an embodiment of the present invention;

[0031] Fig.11 is another connection diagram between the push-pull rod, the left leg and the push-pull block in a forklift according to an embodiment of the present invention, where the push-pull rod is located in the first translation position; wherein, Fig.11 (a) is a side view schematic diagram, Fig.11 (b) is Fig.11 The cross-sectional view (part) shown on line BB in (a);

[0032] Fig.12 1 is another connection diagram between the push-pull rod, the left leg and the push-pull block in a forklift according to an embodiment of the present invention, in which the push-pull rod is located at the second translation position, but the latch has not yet withdrawn from the slot; wherein, Fig.12 (a) is a side view schematic diagram, Fig.12 (b) is Fig.12 The cross-sectional view (part) shown by line CC in (a);

[0033] Fig.13 is another connection diagram between the push-pull rod, the left leg and the push-pull block in a forklift according to an embodiment of the present invention, in which the push-pull rod is at the second translation position, the push-pull block has been disconnected from the latch and continues to move forward; wherein, Fig.13 (a) is a side view schematic diagram, Fig.13 (b) is Fig.13 The cross-sectional view (part) shown on line DD in (a); and

[0034] Fig.14 for Fig.13 A local enlarged schematic diagram of E in FIG. ; and

[0035] Fig.15 The figure is a schematic diagram of the connection between the bridge plate, the rear universal wheel and the intermediate connection mechanism in a forklift according to an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 111, left bracket; 112, right bracket; 113, connecting frame; 114, rack; 115, door frame; 116, gear; 117, driving wheel; 118, front universal wheel;

[0038] 120, push-pull block; 121, card slot;

[0039] 131, left leg; 132, right leg; 133, leg body; 134, lifting rod; 135, compression spring; 136, contact part; 137, mounting seat; 138, positioning cross bar;

[0040] 140, push-pull rod;

[0041] 150, leg slider; 151, wedge-shaped surface; 152, second protrusion; 153, positioning groove;

[0042] 160. guide plate; 161. guide groove;

[0043] 170, push-pull slider; 171, slider body; 172, first convex block; 173, through hole; 174, first boss; 175, second boss;

[0044] 180, latch; 181, extension spring; 182, protrusion;

[0045] 190, guide block; 191, guide groove; 192, receiving groove; 193, transition groove;

[0046] 210, bridge plate; 211, rear universal wheel; 212, connecting plate; 213, vertical plate; 214, rotating shaft;

[0047] EM, motor; RG, rotating rod;

[0048] SH, square hole;

[0049] H1, first vertical position; H2, second vertical position;

[0050] W1, first translation position; W2, second translation position. DETAILED DESCRIPTION

[0051] By referring to the exemplary embodiments, the objects and functions of the present invention and the methods for achieving these objects and functions will be explained. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in different forms. The essence of the description is only to help those skilled in the relevant art to comprehensively understand the specific details of the present invention.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0053] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0054] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and similar expressions used in this document are for illustrative purposes only and are not limiting.

[0055] First of all, when a reach forklift is operating, the side of the mast closer to the object to be transported is the front, and the other side relatively far away from the object to be transported is the rear. At the same time, based on facing forward, the left side is the left, and the right side is the right.

[0056] The present invention provides a gantry reach forklift. In a preferred embodiment, Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, Figure 1 Schematic diagram of the installation of a push-pull block 120 and a gear 116 on a door frame 115 in a forklift according to an embodiment of the present invention; Figure 3 is a schematic diagram of a chassis in a forklift according to an embodiment of the present invention; Figure 4 for Figure 3 A schematic diagram of the bottom view of the chassis structure shown; Figure 5 1 is a schematic diagram of a connection between a push-pull rod 140, a left leg 131 and a push-pull block 120 in a forklift according to an embodiment of the present invention. The reach forklift according to an embodiment of the present invention may include a chassis, a door frame 115, a left leg 131, a right leg 132, a push-pull block 120 and a push-pull rod 140.

[0057] The base frame and the door frame 115 are used as the basic structure of the forklift, and are used to install or carry the left leg 131, the right leg 132, the push-pull block 120 and the push-pull rod 140. The push-pull block 120 is an important component structure of the present application, and is used to drive the push-pull rod 140 to move forward and backward. When the push-pull rod 140 is connected to the push-pull block 120, it can contact and apply downward pressure to the left leg 131 and the right leg 132 under the push and pull of the push-pull block 120. The left leg 131 and the right leg 132 can move downward under the action of the downward pressure, and rebound and reset when the downward pressure is removed.

[0058] Specifically, continue to refer to Figure 1 , Figure 3 and Figure 4 The reach truck in this embodiment may include a left bracket 111, a right bracket 112, and a mast 115 disposed between the left bracket 111 and the right bracket 112. The left bracket 111 and the right bracket 112 are disposed horizontally and parallel to each other. Generally, driving wheels 117 are disposed at the middle positions of the left bracket 111 and the right bracket 112, respectively. The mast 115 can move forward and backward relative to the left bracket 111 and the right bracket 112 along the front-rear direction.

[0059] Regarding the front-rear movement of the door frame 115 relative to the left bracket 111 and the right bracket 112, see Figure 1 and Figure 3 , the left bracket 111 and the right bracket 112 can be respectively provided with racks 114 along the front-back direction on the opposite inner sides. The door frame 115 is respectively provided with gears 116 located below the push-pull block 120 on the left and right sides. The two gears 116 on both sides of the door frame 115 are meshed and connected to the racks 114 on the corresponding sides and can rotate synchronously. When the two gears 116 rotate synchronously, the door frame 115 moves forward and backward because the gears 116 are meshed with the racks 114.

[0060] Regarding how the two gears 116 achieve synchronous rotation, there is no limitation on the specific implementation method. Figure 2 The driving mechanism for realizing the synchronous rotation of the two gears 116 may include a motor EM provided at the bottom of the door frame 115 for providing driving force and a rotating rod RG arranged in the left and right directions. Both ends of the rotating rod RG extend to the outside of the door frame 115. Gears 116 are respectively provided on both sides of the rotating rod RG outside the door frame 115. The power of the motor EM is connected to the rotating rod RG to rotate it, driving the gears 116 at both ends to rotate synchronously.

[0061] The two push-pull blocks 120 of the forklift of this embodiment are respectively arranged on the left and right sides of the door frame 115. The two push-pull blocks 120 can move forward and backward synchronously with the door frame 115.

[0062] refer to Figure 4The forklift of this embodiment includes two legs, namely a left leg 131 and a right leg 132. The left leg 131 and the right leg 132 are respectively arranged at the front positions of the left bracket 111 and the right bracket 112, which are located in front of their respective driving wheels 117. The left bracket 111 and the right bracket 112 can also be provided with front universal wheels 118 at the positions between their respective driving wheels 117 and the corresponding left leg 131 and right leg 132, so as to facilitate the movement of the forklift. The left leg 131 and the right leg 132 can move up and down between a first vertical position H1 and a second vertical position H2 relative to the left bracket 111 and the right bracket 112, respectively. For example, the left leg 131 and the right leg 132 can move downward to the second vertical position H2 relative to the left bracket 111 and the right bracket 112, respectively, when subjected to downward pressure, and can rebound to the first vertical position H1 when the downward pressure is removed. When the left supporting leg 131 and the right supporting leg 132 move downward to the second vertical position H2 , their bottoms may be flush with the bottom of the driving wheel 117 .

[0063] refer to Figure 4 and Figure 5 The forklift of this embodiment includes two push-pull rods 140 movably connected to the push-pull blocks 120 on the corresponding sides between the first translation position W1 and the second translation position W2. The two push-pull rods 140 are respectively disposed inside the left bracket 111 and the right bracket 112 and arranged along the front-to-back direction. The push-pull rods 140 can move forward and backward synchronously relative to the left bracket 111 and the right bracket 112 under the push and pull of the push-pull blocks 120 moving forward and backward, so that the front end thereof presses down or disengages from the corresponding left leg 131 and the right leg 132, thereby applying or canceling downward pressure to the left leg 131 and the right leg 132.

[0064] The push-pull block 120 and the push-pull rod 140 are movably connected so that when the push-pull block 120 drives the push-pull rod 140 to move forward to the second translation position W2, the push-pull block 120 and the push-pull rod 140 are disconnected, so that the push-pull block 120 can continue to move forward with the door frame 115.

[0065] Specifically, refer to Figure 5 , Figure 8 , Fig. 9 and Fig.10 In order to realize the movable connection between the push-pull block 120 and the push-pull rod 140, a vertical slot 121 may be provided on the outer side of the push-pull block 120. A push-pull slider 170 may be provided at the rear end of the push-pull rod 140. The push-pull slider 170 includes a slider body 171. The slider body 171 is provided with a horizontal (along the left and right direction) latch 180 that can be inserted into the slot 121.

[0066] Then, a fixed guide block 190 may be provided on the outer side of the slider body 171. The specific type of the guide block 190 may not be limited, for example, a flat plate structure. The guide block 190 may be fixed on the corresponding left bracket 111 and right bracket 112. A concave receiving groove 192 may be provided on the vertical side of the guide block 190 that is in contact with the slider body 171.

[0067] refer to Fig. 9 , Fig.10 and Fig.14 The latch 180 is further retractable in the left-right direction. The slider body 171 has a through hole 173 for the latch 180 to pass through. The portion of the latch 180 in the through hole 173 is sleeved with a first elastic member for driving the latch 180 to move toward the receiving groove 192.

[0068] Regarding the first elastic member, it can be a compression spring or a tension spring. For example, when the first elastic member is a tension spring 181, the top end of the tension spring 181 is connected to the latch 180, for example, the latch 180 is provided with a radially outward protrusion 182 for connecting the tension spring 181. The bottom end of the tension spring 181 is fixedly connected to the push-pull slider 170. Of course, the portion of the through hole 173 for arranging the tension spring 181 has a relatively larger aperture.

[0069] When the latch 180 moves forward to the second translation position W2 with the push-pull slider 170, the latch 180 can be inserted into the accommodating groove 192 under the elastic force of the push-pull spring, and the other end of the latch 180 withdraws from the slot 121, thereby realizing the disengagement of the push-pull block 120 from the push-pull rod 140 (push-pull slider 170).

[0070] refer to Fig.11 , the front end of the push-pull rod 140 located at the first translation position W1 does not contact the left leg 131 and the right leg 132, so that the left leg 131 and the right leg 132 are located at the first vertical position H1. It should be noted that for ease of description, the left leg 131 is taken as an example in the figure.

[0071] refer to Fig.12 When the push-pull block 120 pushes the push-pull rod 140 to move forward to the second translation position W2, the front end of the push-pull rod 140 applies downward pressure to the left leg 131 and the right leg 132 to move the left leg 131 and the right leg 132 downward to the second vertical position H2.

[0072] refer to Fig.13The push-pull rod 140 moved to the second translation position W2 can be disconnected from the push-pull block 120 to enable the push-pull block 120 to continue to move forward, and the front end of the push-pull rod 140 keeps pressing down the left leg 131 and the right leg 132 to keep the left leg 131 and the right leg 132 in the second vertical position H2.

[0073] According to the forklift of the present invention, the left support leg 131 and the right support leg 132 are respectively provided in front of the driving wheels 117 of the left bracket 111 and the right bracket 112. The left support leg 131 and the right support leg 132 can move up and down under the joint action of the push-pull block 120 and the push-pull rod 140 on the corresponding side. When the push-pull block 120 pushes the push-pull rod 140 to move forward to the second translation position W2, the left support leg 131 and the right support leg 132 can move downward to the second vertical position H2, so that the left support leg 131 and the right support leg 132 can be supported on the ground or other work surfaces, which is equivalent to adding a support point in the front position of the forklift, realizing the backward shifting of the center of gravity of the forklift, and enhancing the stability of the forklift during operation. The push-pull rod 140 moved to the second translation position W2 can be disconnected from the push-pull block 120, so that the push-pull block 120 can continue to move forward, that is, it does not affect the normal forward movement of the door frame 115 for operation. In addition, compared with the existing hydraulic transmission method, the door frame 115 adopts the driving method of gear 116 and rack 114, which is easy to maintain and has higher transmission efficiency.

[0074] refer to Fig.10 In order to make the push-pull slider 170 more stable when it moves forward and backward under the push-pull block 120, the guide block 190 can be a U-shaped guide block 190 with an opening on one side facing inward. The opening is used to arrange the latch 180 so that it can be embedded in the corresponding slot 121 of the push-pull block 120. The U-shaped groove space enclosed in the guide block 190 forms a guide groove 191 adapted to the slider body 171 to achieve directional movement of the slider body 171 (push-pull slider 170). The receiving groove 192 is set on the bottom surface of the guide groove 191 of the guide block 190.

[0075] refer to Fig. 9 In order to make the slider body 171 (push-pull slider 170) more stable when moving in a directional manner, the slider body 171 may also have a vertically protruding first protrusion 172. Of course, the guide groove 191 is also provided with a space for fitting the first protrusion 172. The first protrusion 172 may be arranged protrudingly on both sides of the upper and lower sides in the vertical direction, and its height is higher than that of the slider body 171 and may extend a certain length in the front-rear direction.

[0076] There is no limitation on the structure of the front end of the push-pull rod 140 to achieve pressing down or disengaging from the corresponding left leg 131 and right leg 132 .

[0077] For example, refer to Figure 5 and Figure 6 , wherein the left leg 131 and the right leg 132 may include a leg body 133. The bottom surface of the leg body 133 is generally a planar structure. The leg body 133 is provided with a fixed lifting rod 134 extending vertically from the outside to the inside thereof. To achieve the fixing of the lifting rod 134, for example, the top end of each lifting rod 134 can be connected to the left bracket 111 and the right bracket 112 respectively. A cavity for accommodating the lifting rod 134 is provided in the leg body 133.

[0078] A second elastic member is sleeved on the portion of the lifting rod 134 located in the cavity, which is used to drive the leg body 133 to rebound upward to the first vertical position H1 when the downward pressure is removed.

[0079] The second elastic member may be a compression spring or a tension spring. For example, when the second elastic member is a compression spring 135, the top end of the compression spring 135 may abut against the leg body 133. The bottom end of the compression spring 135 may be connected to the lifting rod 134, and the bottom end of the compression spring 135 and the lifting rod 134 may be fixedly connected or movably connected (such as abutting).

[0080] Then, a pressing mechanism for pressing down the left leg 131 and the right leg 132 may also be provided at the front end of the push-pull rod 140. Figure 6 and Figure 7 The pressing mechanism may include a leg slider 150 and a contact portion 136. The specific type of the contact portion 136 is not limited, and it may be a block structure.

[0081] Each leg slider 150 is arranged at the front end of the push-pull rod 140 on the corresponding side. The bottom of the leg slider 150 is provided with a wedge-shaped surface 151 which gradually moves downward from the front to the rear. The contact portion 136 can be arranged at the top of the leg body 133. When the push-pull rod 140 moves forward until it moves to the second translation position W2, the push-pull rod 140 synchronously drives the wedge-shaped surface 151 of the leg slider 150 to gradually approach and contact the contact portion 136, and then presses down the contact portion 136 through the wedge-shaped surface 151, and presses down the left leg 131 and the right leg 132 through the contact portion 136, and finally the left leg 131 and the right leg 132 move down to the second vertical position H2. When the push-pull rod 140 moves backward, the wedge surface 151 of the leg slider 150 is also synchronously driven away from the contact portion 136, so that the wedge surface 151 does not contact the contact portion 136, so that the left leg 131 and the right leg 132 are reset to the first vertical position H1 under the rebound force of the compression spring 135.

[0082] Continuing to refer to Figure 5, Figure 6 and Figure 7In order to make the leg slider 150 more stable when moving forward and backward and pressing down the left leg 131 and the right leg 132, the forklift of this embodiment may further include a second guide mechanism for achieving directional movement of the leg slider 150. The second guide mechanism may include a second protrusion 152 and a guide plate 160.

[0083] Specifically, the second protrusion 152 can be arranged on the leg slider 150 and protrude horizontally to the left and right sides. For example, the second protrusion 152 can be arranged on the top of the leg slider 150, which is wider than the left and right width of the leg slider 150 and can extend a certain length in the front and rear direction.

[0084] The guide plate 160 is fixed above the corresponding left leg 131 and the right leg 132. For example, the guide plate 160 can be fixed on the corresponding left bracket 111 and the right bracket 112 respectively. The bottom of the guide plate 160 can be provided with a guide groove 161 matching the second protrusion 152. When the push-pull rod 140 drives the leg slider 150 to move forward and backward, the second protrusion 152 slides forward and backward in the guide groove 161.

[0085] When the push-pull block 120 drives the push-pull rod 140 to move forward to the second translation position W2 and the push-pull block 120 is disengaged from the latch 180, in order to further ensure that the push-pull rod 140 stops moving, the forklift of the present application may further include a second positioning mechanism for achieving the stop of the push-pull rod 140.

[0086] Specifically, refer to Figure 5 , Figure 6 and Figure 7 The second positioning mechanism may include an overhead positioning cross bar 138 arranged along the left-right direction on the contact portion 136. The positioning cross bar 138 is horizontally mounted on the mounting seat 137 of the contact portion 136. A positioning groove 153 that matches the positioning cross bar 138 and is connected to the wedge surface 151 may also be provided at the bottom of the leg slider 150. When the push-pull block 120 drives the push-pull rod 140 to move forward to the second translation position W2, the positioning cross bar 138 is just stuck in the positioning groove 153.

[0087] Further, refer to Fig. 9 and Fig.11In order to better synchronize the movement between the push-pull block 120 and the push-pull rod 140, the push-pull slider 170 may further include a first boss 174 and a second boss 175 disposed on the inner side of the slider body 171, both of which are protruded toward the push-pull block 120 and are located at the rear end of the first boss 174. The second boss 175 is protruded toward the push-pull block 140 relative to the first boss 174. A through hole 173 may be disposed in the first boss 174. The connection between the first boss 174 and the slider body 171 along the front-to-back direction may be an arc surface, so that when the push-pull block 120 moves backward, it can be more easily moved to the first boss 174 through the arc surface and abut against the second boss 175 backward. When the push-pull rod 140 stays in the second translation position W2, the push-pull block 120 moves from front to back until it abuts against the second boss 175. The entire push-pull slider 170 can be driven to move backward by pushing the second boss 175. At the same time, when the push-pull block 120 abuts against the second boss 175, the slot 121 of the push-pull block 120 is aligned with the latch 180, so that when the push-pull block 120 drives the push-pull slider 170 to continue to move backward, the latch 180 can be accurately embedded in the slot 121. The second boss 175 also plays a positioning role.

[0088] refer to Figure 3 In order to arrange the push-pull slider 170 more reasonably and achieve better connection or separation with the push-pull block 120, the left bracket 111 and the right bracket 112 can also be provided with a long square hole SH along the front-to-back direction on the opposite inner side surfaces, so as to serve as a moving space for the push-pull slider 170 to move forward and backward. The first boss 174 and the second boss 175 of the push-pull slider 170 can extend from the square hole SH, so that when the push-pull slider 170 moves forward and backward, the first boss 174 and the second boss 175 will be restricted by the square hole SH in the front-to-back direction, which is equivalent to the square hole SH also playing a limiting function. For example, when the push-pull rod 140 moves forward to the second translation position W2, the first boss 174 abuts against the front edge of the square hole SH. When the push-pull rod 140 moves backward to the first translation position W1, the second boss 175 abuts against the rear edge of the square hole SH.

[0089] refer to Fig.14 In order to make it easier for the latch 180 to withdraw from the receiving groove 192 when the push-pull block 120 moves backward and abuts against the second boss 175, and drives the push-pull slider 170 to continue to move backward, transition grooves 193 for smooth transition can be set on the front and rear sides of the receiving groove 192.

[0090] As can be seen from the above, a push-pull block 120 is respectively provided on the left and right sides of the door frame 115. It can be understood that generally, the installation positions of the two push-pull blocks 120 on the door frame 115 are symmetrical, and the installation positions of other components such as the push-pull rod 140, the push-pull slider 170, the leg slider 150 and the support leg are also symmetrical, and their respective sizes and lengths are generally the same, but the opening directions of the slots 121 on the two push-pull blocks 120 are opposite. The push-pull block 120 can be an axially symmetrical mechanism with a larger upper portion and a smaller lower portion. In order to ensure that the latch 180 on each side can be accurately embedded in the push-pull block 120, at least two vertical slots 121 are arranged at intervals on the outer side surface of the push-pull block 120, such as two slots 121, three slots 121, four slots 121 or other reasonable numbers. At least two card slots 121 are constructed to be symmetrically arranged with respect to the vertical center line of the push-pull block 120. This can not only serve as a fool-proof design to ensure that the push-pull block 120 on either side can be used normally by switching it to the opposite side, but also provide multiple card slots 121 for use during installation, and try to ensure that the pin 180 can be embedded in one of the card slots 121. When a card slot 121 is damaged, there is a replacement card slot 121 for use.

[0091] In addition, refer to Figure 3 and Figure 4 A connecting frame 113 is further provided between the rear ends of the left bracket 111 and the right bracket 112. A bridge plate 210 that can be lowered on one side and raised on the other side in the left-right direction can also be provided below the middle position of the connecting frame 113. A rear universal wheel 211 is installed at each end of the bridge plate 210.

[0092] Further, refer to Fig.15 The forklift of the present application may also include an intermediate connection mechanism pivotally connected to the bridge plate 210 via a horizontal rotating shaft 214, so as to realize that one side of the bridge plate 210 falls down and the other side is lifted up. The intermediate connection mechanism may include a horizontal connecting plate 212 fixedly connected to the connecting frame 113. Vertical plates 213 are respectively arranged at the front and rear of the connecting plate 212, and the rotating shaft 214 rotatably penetrates the two vertical plates 213 and the bridge plate 210.

[0093] The connecting plate 212 and the bridge plate 210 are spaced apart by a certain distance in the vertical direction, so that the bridge plate 210 does not interfere with the connecting plate 212 when swinging up and down.

[0094] At present, the driving wheel 117 and the driven wheel installed on the chassis of the reach forklift are mostly fixed at a fixed height, and cannot be adaptively changed in the up and down position according to the terrain change, so that the driving wheel 117 may be suspended, and thus cannot move normally. The forklift of the present application is provided with two rear universal wheels 211 that can be adjusted up and down through the bridge plate 210. When the forklift is moving on a road with a changing terrain, the two rear universal wheels 211 can adaptively adjust their up and down positions according to the terrain change through the bridge plate 210, so that the driving wheel 117 can keep in contact with the road surface and avoid being suspended.

[0095] Other embodiments of the present invention will be readily apparent to those skilled in the art from the description and practice of the invention disclosed herein. The description and embodiments are to be considered exemplary only, and the true scope and spirit of the present invention are to be limited by the claims.

Claims

1. A mast-reaching forklift, characterized in that: The forklift comprises: A bottom frame, the bottom frame comprising a left bracket, a right bracket and a connecting frame with two ends respectively connected to the left bracket and the right bracket; the left bracket and the right bracket are respectively provided with racks along the front-back direction on the opposite inner sides; A door frame, the door frame is arranged between the left bracket and the right bracket and is movable in the front-rear direction relative to the left bracket and the right bracket; the door frame is provided with a push-pull block and a gear located below the push-pull block on the left and right sides respectively, and the two gears on both sides of the door frame can rotate synchronously and mesh with the racks on the corresponding sides; A left leg and a right leg are respectively arranged on the left bracket and the right bracket at positions in front of the respective driving wheels, and the left leg and the right leg are configured to be movable up and down between a first vertical position and a second vertical position relative to the left bracket and the right bracket respectively; as well as Push-pull rods are respectively arranged inside the left bracket and the right bracket along the front-rear direction, and the push-pull rods are configured to be movably connected to the push-pull block between a first translation position and a second translation position relative to the left bracket and the right bracket, and to move forward and backward synchronously under the push-pull force applied by the push-pull block in forward and backward movement; Among them, the front end of the push-pull rod located at the first translation position does not contact the left leg and the right leg, so that the left leg and the right leg are located in the first vertical position; when the push-pull block pushes the push-pull rod to move forward to the second translation position, the front end of the push-pull rod applies downward pressure to the left leg and the right leg, so that the left leg and the right leg move downward to the second vertical position, and the push-pull rod moved to the second translation position can be disconnected from the push-pull block to enable the push-pull block to continue to move forward, and the front end of the push-pull rod keeps pressing down the left leg and the right leg, so that the left leg and the right leg remain in the second vertical position.

2. The forklift according to claim 1, characterized in that: A bridge plate is also arranged in the middle of the connecting frame, which can be lowered on one side and lifted on the other side in the left-right direction, and rear universal wheels are respectively installed at both ends of the bridge plate.

3. The forklift according to claim 2, characterized in that: The forklift also includes an intermediate connection mechanism pivotally connected to the bridge plate via a horizontal rotating shaft so as to achieve the bridge plate falling on one side and lifting on the other side, the intermediate connection mechanism comprising: A horizontal connecting plate fixedly connected to the connecting frame; Two vertical plates connected to the connecting plate and located at the front and rear of the connecting plate, the rotating shaft rotatably passing through the two vertical plates and the bridge plate; Wherein, the connecting plate and the bridge plate are spaced a certain distance apart in the vertical direction.

4. The forklift according to claim 1, characterized in that: In order to realize that the push-pull rod is movably connected to the push-pull block, the forklift further includes: A vertical slot provided on the outer side of the push-pull block; A push-pull slider is arranged at the rear end of the push-pull rod, and the push-pull slider comprises a slider body. The slider body is provided with a horizontal latch in the left and right directions that can be embedded in the slot.

5. The forklift according to claim 4, characterized in that: The forklift also includes a first guide mechanism for realizing directional movement of the push-pull slider and a first positioning mechanism for realizing stopping movement of the push-pull rod; The first guiding mechanism comprises: A U-shaped guide block with an opening toward the inside, wherein the guide block has a guide groove adapted to the slider body; The first positioning mechanism comprises: a receiving groove provided to the bottom surface of the guide groove of the guide block; The latch is configured to be retractable in the left-right direction, and the push-pull slider has a through hole for the latch to pass through; a first elastic member is sleeved on the portion of the latch in the through hole for driving the latch to move toward the receiving slot; When the latch embedded in the slot moves forward to the second translation position along with the push-pull block, the latch is inserted into the receiving slot under the elastic force of the first elastic member to be withdrawn from the slot.

6. The forklift according to claim 4, characterized in that: At least two vertical slots are arranged at intervals on the outer side surface of the push-pull block, and the at least two slots are arranged symmetrically with respect to the vertical center line of the push-pull block.

7. The forklift according to claim 4, characterized in that: The push-pull slider further comprises a first boss provided on the inner side surface of the slider body and protruding toward the push-pull block, and a second boss located at the rear end of the first boss, wherein the connection between the first boss and the slider body in the front-rear direction is configured as an arc surface; Wherein, when the latch is inserted into the slot, the second boss abuts against the push-pull block from back to front.

8. The forklift according to claim 1, characterized in that: The left leg and the right leg both include a leg body, the leg body is provided with a lifting rod extending vertically from the outside to the inside thereof, and the leg body is provided with a cavity for accommodating the lifting rod; the part of the lifting rod located in the cavity is sleeved with a second elastic member, which is used to drive the leg body to rebound upward to the first vertical position when the downward pressure is withdrawn.

9. The forklift according to claim 8, characterized in that: The forklift also includes a pressing mechanism for realizing the pressing down of the front end of the push-pull rod, and the pressing mechanism includes: A leg slider is arranged at the front end of the push-pull rod, and a wedge-shaped surface is arranged at the bottom of the leg slider and gradually moves downward from the front to the rear; a contact portion disposed to the leg body; When the push-pull rod moves forward to the second translation position, the wedge surface contacts and presses down the contact portion, so that the left leg and the right leg move downward to the second vertical position.

10. The forklift according to claim 9, characterized in that: The forklift also includes: A second guiding mechanism for realizing directional movement of the leg slider, the second guiding mechanism comprising: A second protrusion that is arranged to protrude outwardly from the horizontal position of the leg slider; A guide plate is respectively arranged above the left leg and the right leg, and a guide groove matching the second protrusion is arranged at the bottom of the guide plate; and / or A second positioning mechanism for stopping the push-pull rod from moving, the second positioning mechanism comprising: An overhead positioning cross bar arranged along the left-right direction on the contact portion; A positioning groove is arranged at the bottom of the leg sliding block and is connected with the wedge surface and matches the positioning cross bar.

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